1. A ceramic precise small-sized constant delivery pump, which is characterized in that,

including plunger bushing, plunger and constant delivery pump fixing base, the plunger bushing is installed the lower half of constant delivery pump fixing base, the inlet and the liquid outlet that run through are seted up to the bottom of plunger bushing, the plunger is arranged in the inside of plunger bushing, the bottom of plunger has D type terminal surface, rotates the plunger is in the mouth in the planar range of D type terminal surface is opened, and the mouth in the cylinder scope is closed, treats carry out the up-and-down motion that the stroke is fixed when the plunger is rotatory, realize quantitative extraction and discharge liquid.

2. Ceramic precision small-sized dosing pump according to claim 1,

the small ceramic precise quantitative pump further comprises a sealing ring, and the sealing ring is arranged on the upper end face of the plunger sleeve.

3. Ceramic precision small-sized dosing pump according to claim 2,

the small ceramic precise quantitative pump further comprises a shaft sleeve, a transverse shaft and a bearing, wherein the shaft sleeve is arranged at the head of the plunger, one end of the transverse shaft penetrates through the shaft sleeve, and the bearing is arranged at one end of the transverse shaft.

4. Ceramic precision small-sized dosing pump according to claim 3,

the plunger sleeve is provided with an end face cam, and the lowest point and the highest point of the end face cam have a height difference.

5. Ceramic precision small-sized dosing pump according to claim 4,

the ceramic precise small quantitative pump also comprises a stepping motor, and the stepping motor is arranged at the upper end of the quantitative pump fixing seat.

6. Ceramic precision small-sized dosing pump according to claim 5,

the small-size quantitative pump of accurate pottery still includes the slip adapter sleeve, step motor's output shaft with slip adapter sleeve fixed connection, U type groove has been seted up to the lower part both sides of slip adapter sleeve, just U type groove card is gone into the both ends of cross axle.

7. Ceramic precision small-sized dosing pump according to claim 6,

the ceramic precision small quantitative pump further comprises a compression spring which is arranged between the sliding connecting sleeve and the head of the plunger.

8. Ceramic precision small-sized dosing pump according to claim 5,

the small ceramic precise quantitative pump further comprises an inverted end face cam, wherein the inverted end face cam is arranged above the end face cam, and the end face of the inverted end face cam is matched with the end face of the end face cam.

Background

At present, many automatic instruments often need to continuously and quantitatively extract and inject certain liquid, and the precision and the stability are often higher.

At present, pumps capable of realizing accurate quantitative liquid extraction and discharge are commonly used in the market, such as screw rod plunger pumps, electromagnetic quantitative pumps and the like.

The screw rod plunger pump realizes the pumping and the discharging by rotating a screw rod and pushing a plunger through a motor, but the screw rod plunger pump is usually large in size and high in price, needs an electromagnetic valve to assist in converting a liquid path, and is greatly influenced by the loss of steps of the motor in stability and precision; the electromagnetic quantitative pump realizes liquid extraction and discharge through the deformation of the rubber bowl controlled by the electromagnet, although the size is not large, the quantitative size needs to be manually adjusted, the operation is very inconvenient, and the accuracy and the stability are greatly influenced by the temperature due to the adoption of the rubber part. In order to meet the requirement of an instrument on continuous, stable and accurate quantification, the invention designs a ceramic precise small-sized quantitative pump.

Disclosure of Invention

The invention aims to provide a ceramic precise small quantitative pump which can meet the requirement of an instrument on continuous, stable and precise quantification.

In order to achieve the purpose, the ceramic precise small quantitative pump comprises a plunger sleeve, a plunger and a quantitative pump fixing seat, wherein the plunger sleeve is installed on the lower half part of the quantitative pump fixing seat, a liquid inlet and a liquid outlet which penetrate through the plunger sleeve are formed in the bottom of the plunger sleeve, the plunger is arranged in the plunger sleeve, the bottom of the plunger is provided with a D-shaped end surface, the plunger is rotated, an opening in the plane range of the D-shaped end surface is opened, an opening in the cylindrical range is closed, and when the plunger rotates, the plunger moves up and down with a fixed stroke, so that quantitative extraction and liquid discharge are achieved.

The ceramic precise small quantitative pump further comprises a sealing ring, and the sealing ring is arranged on the upper end face of the plunger sleeve.

The ceramic precise small quantitative pump further comprises a shaft sleeve, a transverse shaft and a bearing, wherein the shaft sleeve is arranged at the head of the plunger, one end of the transverse shaft penetrates through the shaft sleeve, and the bearing is arranged at one end of the transverse shaft.

The plunger sleeve is provided with an end face cam, and the lowest point and the highest point of the end face cam have a height difference.

The ceramic precise small quantitative pump also comprises a stepping motor, and the stepping motor is arranged at the upper end of the quantitative pump fixing seat.

The small-size quantitative pump of accurate pottery still includes the slip adapter sleeve, step motor's output shaft with slip adapter sleeve fixed connection, U type groove has been seted up to the lower part both sides of slip adapter sleeve, just U type groove card is gone into the both ends of cross axle.

Wherein the ceramic precision small-sized fixed displacement pump further comprises a compression spring disposed between the sliding connection sleeve and the head of the plunger.

The ceramic precise small quantitative pump further comprises an inverted end face cam, the inverted end face cam is arranged above the end face cam, and the end face of the inverted end face cam is matched with the end face of the end face cam.

According to the ceramic precise small quantitative pump, the plunger and the plunger sleeve are made of ceramic materials, so that the influence of temperature on the volume can be greatly reduced, and the precision is guaranteed; the outer wall of the plunger and the inner wall of the plunger sleeve require high smoothness, the fit clearance of the plunger and the inner wall of the plunger sleeve is less than 5 microns, and the plunger sleeve can form a self-sealing effect and simultaneously ensure small frictional resistance. In addition the plunger bushing is installed in the lower half part of the fixed base of the constant delivery pump, a penetrating liquid inlet and a penetrating liquid outlet are formed in the bottom of the plunger bushing, a D-shaped end face is formed in the corresponding position of the bottom of the plunger, when the plunger rotates, an opening in the plane range of the D-shaped end face is opened, an opening in the cylindrical range is closed, and when the plunger rotates, the plunger does up-and-down motion with fixed stroke, so that liquid can be quantitatively extracted and discharged, accurate quantification is realized, and the requirement of an instrument on continuous, stable and accurate quantification is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of an external structure of a ceramic precision small quantitative pump according to the present invention.

Fig. 2 is a view of embodiment 1 of the present invention with the fixed displacement pump holder hidden.

Fig. 3 is a sectional view of embodiment 1 of the present invention.

Fig. 4 is an end cam view of embodiment 1 of the present invention.

Fig. 5 is a view of embodiment 2 of the present invention with the fixed displacement pump holder hidden.

Fig. 6 is a sectional view of embodiment 2 of the present invention.

1. A stepping motor; 2. a groove-shaped optical coupler; 3. a fixed base of the constant delivery pump; 4. a connecting sleeve is slid; 5. an end cam; 6. a plunger sleeve; 7. a compression spring; 8. a bearing; 9. a horizontal axis; 10. a seal ring; 11. a plunger; 12. a sealing plug; 13. a reverse facing cam.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to 4, in embodiment 1, the present invention provides a ceramic precision small-sized fixed displacement pump, including a plunger sleeve 6, a plunger 11 and a fixed displacement pump holder 3, where the plunger sleeve 6 is mounted on a lower half portion of the fixed displacement pump holder 3, a liquid inlet and a liquid outlet penetrating through the bottom of the plunger sleeve 6 are formed in the bottom of the plunger sleeve 6, the plunger 11 is disposed inside the plunger sleeve 6, the bottom of the plunger 11 has a D-shaped end surface, and when the plunger 11 is rotated, an opening in a planar range of the D-shaped end surface is opened, and an opening in a cylindrical range is closed, and when the plunger 11 rotates, the plunger 11 performs a stroke-fixed up-and-down motion to implement quantitative liquid extraction and discharge.

The small ceramic precise quantitative pump further comprises a sealing ring 10, and the sealing ring 10 is arranged on the upper end face of the plunger sleeve 6.

The small ceramic precise quantitative pump further comprises a shaft sleeve, a transverse shaft 9 and a bearing 8, wherein the shaft sleeve is arranged at the head of the plunger 11, one end of the transverse shaft 9 penetrates through the shaft sleeve, and the bearing 8 is arranged at one end of the transverse shaft 9.

The plunger sleeve 6 is provided with an end face cam 5, and the lowest point and the highest point of the end face cam 5 have a height difference.

The ceramic precise small quantitative pump further comprises a stepping motor 1, and the stepping motor 1 is arranged at the upper end of the quantitative pump fixing seat 3.

The small-size quantitative pump of accurate pottery still includes sliding connection cover 4, step motor 1's output shaft with 4 fixed connection of sliding connection cover, U type groove has been seted up to the lower part both sides of sliding connection cover 4, just U type groove card is gone into the both ends of cross axle 9.

The ceramic precision small quantitative pump further comprises a compression spring 7, and the compression spring 7 is arranged between the sliding connecting sleeve 4 and the head of the plunger 11.

A butterfly-shaped boss is arranged on the sliding connecting sleeve 4, and an induction groove is formed in the butterfly-shaped boss.

The ceramic precise small quantitative pump further comprises a groove-shaped optical coupler 2, and the groove-shaped optical coupler 2 is arranged on one side of the quantitative pump fixing seat 3.

The lowest point and the highest point of the end surface cam 5 respectively reserve a section of horizontal plane.

And a sealing plug 12 is arranged at the bottom of the fixed base 3 of the fixed displacement pump.

In the present embodiment, the plunger 11 and the plunger sleeve 6 are made of ceramic materials, so that the influence of temperature on the volume can be greatly reduced, and the precision can be ensured; the outer wall of the plunger 11 and the inner wall of the plunger sleeve 6 require high smoothness, the fit clearance is less than 5 microns, the self-sealing effect can be formed, and meanwhile, the friction resistance between the plunger 11 and the plunger sleeve 6 is ensured to be small. In addition, the plunger sleeve 6 is installed on the lower half portion of the fixed base 3 of the constant delivery pump, a penetrating liquid inlet and a penetrating liquid outlet are formed in the bottom of the plunger sleeve 6, the corresponding position of the bottom of the plunger 11 is made into a D-shaped end face, when the plunger 11 rotates, an opening in the plane range of the D-shaped end face is opened, an opening in the cylindrical range is closed, and when the plunger 11 rotates, the plunger 11 moves up and down with a fixed stroke, so that liquid can be quantitatively extracted and discharged, accurate quantification is achieved, and the requirement of an instrument on continuous, stable and accurate quantification is met.

Further, the techniques for realizing the combined rotation and up-and-down movement of the plunger 11 are as follows:

the head of the plunger 11 is provided with the shaft sleeve, one transverse shaft 9 penetrates through the shaft sleeve to be perpendicular to the shaft sleeve, and one end of the transverse shaft 9 is provided with the bearing 8. The end face cam 5 is mounted on the upper end face of the plunger sleeve 6, the lowest point and the highest point of the end face have a height difference, and when the plunger 11 rotates, the vertical projection of the bearing 8 on the transverse shaft 9 of the plunger always falls on the end face of the end face cam 5. The stepping motor 1 is installed at the upper end of the fixed displacement pump fixing seat 3, and an output shaft of the stepping motor 1 is fixed with the sliding connection sleeve 4. The sliding connection sleeve 4 is provided with a dish-shaped boss, two sides of the lower portion of the sliding connection sleeve are provided with U-shaped grooves, the U-shaped grooves are just clamped into two ends of the transverse shaft 9 at the head portion of the plunger 11, and therefore motor torque force can be output to the plunger 11 while the transverse shaft 9 can slide up and down in the U-shaped grooves.

A compression spring 7 is installed between the sliding connecting sleeve 4 and the head of the plunger 11, and the compression spring 7 can continuously provide a force for enabling the plunger 11 to move downwards, so that the bearing 8 at the head of the plunger 11 is always tightly attached to the end face of the end face cam 5.

When the stepping motor 1 drives the plunger 11 to rotate, the bearing 8 always clings to the end face of the end face cam 5 to move, and when the bearing moves from the lowest point to the highest point of the end face, the bearing 8 moves upwards to lift the plunger 11 and move upwards to extract liquid; when the bearing 8 moves from the highest point to the lowest point of the end cam 5, the bearing 8 moves downwards, the compression spring 7 presses the plunger 11 down and moves downwards to discharge liquid. This makes it possible to realize a combined movement of the up and down movement while the plunger 11 is rotated.

Cell type opto-coupler 2 is installed 3 one side of constant delivery pump fixing base, the dish-shaped boss on the slip adapter sleeve 4 is opened there is the response groove, and the boss is located in the groove of cell type opto-coupler 2, slip adapter sleeve 4 with plunger 11 synchronous revolution passes through the reset position is judged to cell type opto-coupler 2.

When the bearing 8 on the plunger 11 moves to the lowest point of the end face cam 5, the plunger 11 is just in the reset position, at this time, the plane notch of the D-shaped end face at the bottom of the plunger 11 is parallel to the liquid inlet and the liquid outlet of the plunger sleeve 6, the liquid inlet and the liquid outlet are both located in the cylindrical surface range of the D-shaped end face, namely, the liquid inlet and the liquid outlet are both in the closed state.

The lowest point and the highest point of the end surface cam 5 respectively reserve a section of horizontal plane, the function is to match the D-shaped end surface at the bottom of the plunger 11, and when the liquid inlet or the liquid outlet is not positioned in the plane range of the D-shaped end surface, the plunger 11 does not move up and down.

The plunger 11 rotates for a circle to respectively finish the extraction and the discharge of liquid once, the quantitative volume is determined by the sectional area of the plunger 11 and the height difference of the end face cam 5, and after the two parameters are fixed, the continuous accurate repeated quantification can be realized.

A ceramic precise small quantitative pump is provided, as long as the stepping motor 1 completes one complete circular motion, namely rotates from a reset position to the reset position, the quantitative extraction and the quantitative discharge of one liquid are certainly completed, and the influence of the step loss of the stepping motor 1 is avoided.

Referring to fig. 5 and 6, in embodiment 2, the present invention provides a ceramic precision small-sized fixed displacement pump, including a plunger sleeve 6, a plunger 11 and a fixed displacement pump holder 3, where the plunger sleeve 6 is mounted on a lower half portion of the fixed displacement pump holder 3, a penetrating liquid inlet and a penetrating liquid outlet are formed in a bottom of the plunger sleeve 6, the plunger 11 is disposed inside the plunger sleeve 6, a D-shaped end surface is formed in the bottom of the plunger 11, and when the plunger 11 is rotated, an opening in a planar range of the D-shaped end surface is opened, and an opening in a cylindrical range is closed, and when the plunger 11 rotates, the plunger 11 performs a stroke-fixed up-and-down motion to implement quantitative liquid extraction and discharge.

The small ceramic precise quantitative pump further comprises a sealing ring 10, and the sealing ring 10 is arranged on the upper end face of the plunger sleeve 6.

The small ceramic precise quantitative pump further comprises a shaft sleeve, a transverse shaft 9 and a bearing 8, wherein the shaft sleeve is arranged at the head of the plunger 11, one end of the transverse shaft 9 penetrates through the shaft sleeve, and the bearing 8 is arranged at one end of the shaft sleeve.

The plunger sleeve 6 is provided with an end face cam 5, and the lowest point and the highest point of the end face cam 5 have a height difference.

The small ceramic precise quantitative pump further comprises a stepping motor 1 and a sliding connecting sleeve 4, wherein the stepping motor 1 is arranged at the upper end of the quantitative pump fixing seat 3, an output shaft of the stepping motor 1 is fixedly connected with the sliding connecting sleeve 4, U-shaped grooves are formed in two sides of the lower portion of the sliding connecting sleeve 4, and the U-shaped grooves are clamped into two ends of the transverse shaft 9.

The small ceramic precise quantitative pump further comprises a reverse end cam 13, wherein the reverse end cam 13 is arranged above the end cam 5, and the end face of the reverse end cam 13 is matched with the end face of the end cam 5.

In this embodiment, in addition to embodiment 1, the compression spring 7 between the slide coupling sleeve 4 and the head of the plunger 11 is not installed, the reverse facing cam 13 is installed at a certain distance directly above the facing cam 5, the facing cam 13 has a downward facing end face and has exactly the same shape as the facing cam 5 below, and the distance between the upper and lower end faces is slightly larger than the outer diameter of the bearing 8.

When the stepping motor 1 drives the plunger 11 to rotate, the bearing 8 can only move in an end face track formed by the two end face cams 5 and the reverse end face cam 13, that is, the plunger 11 is forced to move upwards or downwards, so that the combined movement of the up-and-down movement while the plunger 11 rotates can be realized.

The two schemes of example 1 and example 2 have respective technical points:

in embodiment 1, the compression spring 7 is adopted, so that the movement backlash between the bearing 8 and the end cam 5 can be eliminated, high quantitative accuracy can be achieved, and the method is suitable for the condition that the displacement is not large and the accuracy requirement is high.

Embodiment 2 adopts the cam track structure of two terminal surfaces, as long as step motor 1 moment of torsion satisfies, plunger 11 must carry out the up-and-down motion, can bear bigger pump drainage pressure, is applicable to the big precision requirement of discharge capacity and is not the condition high very much.

In conclusion, in the ceramic precise small quantitative pump, the change of the volume of the cavity is little influenced by the temperature, and the quantification is precise; in addition, the rotation and the up-and-down movement of the plunger 11 can be realized by a motor; the ceramic precise small quantitative pump has small volume and simple structure; the ceramic precise small quantitative pump can realize continuous precise quantitative extraction and discharge; the ceramic precise small quantitative pump has good air tightness.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.