1. The utility model provides a circular heat transfer device of piecemeal which characterized in that: the heat exchange device is of a discrete circular structure and consists of a plurality of heat exchange units, the heat exchange units are of rectangular structures, the heat exchange units are arranged along the cross section of a flow channel, the length of the heat exchange units close to the maximum diameter of the circle is longest, and the lengths of the heat exchange units on two sides are gradually reduced; the upper side and the lower side of the heat exchange unit are connected with pipe boxes, one side of each pipe box is fixed, and the other opposite side of each pipe box floats.

2. The heat exchange device of claim 1, wherein: gaps are reserved among the heat exchange units, and the gaps are 5-10 mm.

3. The heat exchange device of claim 1, wherein: the heat exchange unit is divided into blocks according to the direction of the heat exchange tube and the size of the heat exchange unit is circular, the circular size is converted according to the size of a heat exchange channel of the inner flow channel, the cross-sectional area of the heat exchange channel is assumed to be S, and the diameter of the circle is 1.05-1.15 times of the diameter of the heat exchange channel of the inner flow channel; the number of the heat exchange units is 5-9.

4. The heat exchange device of claim 1, wherein: the heat exchange units are symmetrically or asymmetrically arranged.

5. A segmented circular heat exchanger comprising a heat exchange unit according to any one of claims 1 to 4, wherein: the block circular heat exchange device is positioned on the inner runner surface of the shell (2), streaming spaces are arranged on two sides of the block circular heat exchange device (1), and fluid baffles (5) are arranged on the two sides; a closed circulation system is realized through the water inlet pipe/the water outlet pipe of the upper pipe box (3) and the lower pipe box (4).

6. The heat exchanger of claim 5, wherein: the water inlet and outlet modes of the heat exchanger are an upper inlet and lower outlet mode, an upper inlet and upper outlet mode, a lower inlet and lower outlet mode and a lower inlet and upper outlet mode; the water inlet pipe/water outlet pipe is arranged on the upper pipe box (3) or the lower pipe box (4) according to the requirement of the process.

7. The heat exchanger of claim 5, wherein: the connection mode of the tube box and the shell (2) is as follows: one side of the pipe box is welded and fixed, and the other opposite side of the pipe box is in floating connection; the floating tube box is connected to the external pipe of the housing (2) by means of a bellows compensator (6).

8. The heat exchanger of claim 5, wherein: the block circular heat exchange device (1) is used for cooling/heating gas and liquid working media.

Background

The heat exchanger has strict requirements on heat transfer in the industries of refrigeration/heating, wind tunnel, environmental test, high-altitude simulation, electric power and the like, and is particularly a large-scale heat exchange runner system. The traditional heat exchange flow channel is a round or square flow channel, and the cross section of the heat exchanger is rectangular. When the air duct is circular, the front end of the heat exchanger is provided with a circular-to-square structure, and the rear end of the heat exchanger is provided with a square-to-circular structure to change the flow channel so as to ensure the matching with the heat exchange section, which inevitably causes dead angles in heat exchange, and in order to ensure the uniformity of the flow field, the front end of the heat exchanger is also provided with a damping net so as to improve the quality of the flow field.

At present, in the industries of refrigeration/heating, wind tunnel, environmental test, high altitude simulation, electric power and the like, particularly heat exchange equipment belonging to a pressure environment is provided, a flow channel is usually a circular flow channel, a heat exchanger usually adopts a whole or a plurality of identical rectangular heat exchangers, and a circular pressure-bearing container needs to be covered on the outer side of the heat exchanger due to belonging to the pressure environment, so that the rectangular heat exchanger can cause the problems of increased installation space and poorer flow field uniformity.

Disclosure of Invention

The purpose of the invention is: aiming at the defects of the prior device, the block circular heat exchange device and the heat exchanger are designed, and the purpose is to make the heat exchange device better utilize the effective sectional area of a flow channel and improve the flow field quality of the inlet side of the heat exchanger. Avoiding the introduction of further auxiliary measures to achieve the same functionality.

In order to solve the technical problem, the technical scheme of the invention is as follows:

on one hand, the invention provides a partitioned circular heat exchange device which is of a discrete circular structure and consists of a plurality of heat exchange units, wherein the heat exchange units are of a rectangular structure, the heat exchange units are distributed along the section of a flow channel, the length of the heat exchange units close to the maximum diameter of a circle is longest, and the lengths of the heat exchange units on two sides are gradually reduced. The upper side and the lower side of the heat exchange unit are connected with pipe boxes, one side of each pipe box is fixed, and the other opposite side of each pipe box floats;

the heat exchange unit is divided into blocks according to the round size according to the position of the heat exchange tube, the round size is converted according to the size of a heat exchange channel of the inner flow channel, the block heat exchanger belongs to a discrete structure, machining, manufacturing, field installation and the like are considered, the number of the blocks is not too much or too little, the number of the blocks is too little, the size of an outer circle is increased due to the area principle of the heat exchange cross section size and the like, the design difficulty is increased, the number of the blocks is too much, and the manufacturing cost of the heat exchange unit blocks is increased. Assuming that the heat exchange cross-sectional area is S, if the inner flow channel space occupied by a single square is 1.57S, the space occupied by 3 blocks is 1.45S, the space occupied by 5 blocks is 1.3S, the space occupied by 7 blocks is 1.21S, and the space occupied by 9 blocks is 1.13S. According to the area relation, the diameter of the circle is 1.05-1.15 times of the diameter of the heat exchange channel of the inner flow passage.

The heat exchange units can be symmetrically or asymmetrically arranged; preferably, the heat exchange units are symmetrically arranged and the number of the heat exchange units is 5-9. According to the technical economic evaluation according to mechanical products, the economic evaluation value is greater than 0.7, and the blocking is better. Meanwhile, through the simulation analysis of the heat exchange section flow field, if the number of the blocks is less than 5, a large heat exchange dead angle can occur, if the number of the blocks is more than 9, the economic evaluation value does not meet the requirement, and therefore, the reasonable number of the blocks can be obtained, namely 5-9 blocks.

In general, a gap of 5-20mm is reserved between the heat exchange units; when the temperature difference is small, the heat exchange units can be arranged in a fitting mode.

On the other hand, the invention provides a block circular heat exchanger which comprises the block circular heat exchange device, wherein the block circular heat exchange device is positioned on the inner runner surface of a shell, series flow spaces exist at two sides of the block circular heat exchange device, and fluid baffles are arranged at the two sides of the block circular heat exchange device; a closed circulation system is realized through the water inlet pipes/the water outlet pipes of the upper pipe box and the lower pipe box.

The water inlet and outlet modes of the heat exchanger are an upper inlet and lower outlet mode, an upper inlet and upper outlet mode, a lower inlet and lower outlet mode and a lower inlet and upper outlet mode; the water inlet pipe/water outlet pipe is arranged on the upper pipe box or the lower pipe box according to the requirements of the process.

According to the temperature of the working medium or the temperature difference, the upper tube box or the lower tube box of the heat exchanger can be arranged into a floating structure to release thermal deformation caused by the temperature difference, and is arranged into a fixed end relative to the tube box. The tube box at the floating end is connected with an external pipeline through a corrugated pipe compensator. The upper and lower pipe boxes are connected with the shell in a mode that: one side of the pipe box is welded and fixed, and the other opposite side of the pipe box is in floating connection; the tube box at the floating end is connected with an external pipeline of the shell through a corrugated pipe compensator.

The block circular heat exchange device is used for cooling/heating working media such as gas, liquid and the like. The method is applied to the industries of refrigeration/heating, wind tunnel, environmental test, high-altitude simulation, electric power and the like.

The invention has the beneficial effects that:

the invention relates to a heat exchange device used in the industries of refrigeration/heating, wind tunnel, environmental test, high altitude simulation, electric power and the like. The device can improve the effective sectional area of the flow channel and improve the flow field quality at the inlet side of the heat exchanger. The method avoids introducing more auxiliary measures to realize the same function, and has wide market prospect.

In wind tunnel test, environment and high altitude simulation, high temperature or low temperature fluid is sent to the block type heat exchanger through the circular flow passage, thereby realizing the temperature reduction or rise of fluid, and then the fluid suitable for test or discharge is sent to a test room, an exhaust tower or directly discharged. The sectional cooler is equivalent to a round cooler which is dispersed into a plurality of rectangular cooler units, water inlet and outlet pipes are arranged at two ends of the rectangular cooler units, and a plurality of cooler units form a complete heat exchanger. The dispersion mode better utilizes the effective sectional area of the flow channel and also improves the flow field quality at the inlet side of the heat exchanger.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly explained. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a cross-sectional view of a segmented circular heat exchange device;

FIG. 2 is a front view of the upper portion of a block round heat exchanger;

in the figure: 1-heat exchange device, 2-shell, 3-upper tube box, 4-lower tube box, 5-partition plate and 6-corrugated pipe compensator.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Features of various aspects of embodiments of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the invention.

In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.

The working principle of the heat exchanger is shown in fig. 1, and the black arrows in fig. 2 indicate one flow direction of the heat exchange medium. According to the actual circular cross-sectional dimension (radius is R2) of the engineering runner, the block heat exchange device of this embodiment is transversely divided into 5 heat exchange units, which are arranged symmetrically, and are A, B, C.. the heat exchange unit length near the center of the circular cross-section is longest and is gradually decreased along the central axis in a laterally symmetrical manner. The heat exchange unit is divided into blocks according to the direction of the heat exchange tube and the circle, the size of the circle (the radius is R2) is converted according to the size of the cross section of the heat exchange channel of the inner flow channel, the heat exchange cross section area is S (the radius is R1), the heat exchange unit is divided into blocks according to the direction of the heat exchange tube and the circle, the space occupied by the 5 blocks is 1.3S, and the diameter (2R 2) of the circle is 1.14 times (namely √ 1.3) of the diameter (2R 1) of the heat exchange channel of the inner flow channel.

The heat exchange unit is installed in such a way that one end of the tube box is fixed on the inner wall of the flow channel, the other end of the tube box is of a floating structure, and in order to ensure that the tube box does not vibrate or deform too much under the action of a working medium, a compensator 6 in the figure 2 is connected to the tube box of the floating structure to release the displacement of the heat exchange unit in the corresponding direction and limit the displacement in the other two directions. And 5-10mm gaps are reserved between the heat exchange units according to the thermal expansion of the tube box. In the figure 1, a heat exchange medium passes through heat exchange units A and B.the upper pipe box 1 enters the lower pipe box 4 and then exits or the lower pipe box 4 enters the upper pipe box 1, and then a heat exchange system is formed according to pipe passes in I and II.in the figure 2.

Fig. 2 shows a heat exchange device used in an environmental test, in which the heat exchange device 1 is located on a flow channel surface in a housing 2 and is used for cooling/heating working media such as gas and liquid. A plurality of heat exchange units such as the heat exchange devices A and B are connected with a water inlet pipe/water outlet pipe of the upper pipe box 3, and a water inlet pipe/water outlet pipe of the lower pipe box 4 are connected with a closed circulation system. Since the heat exchanger is a discrete circular structure, there are cross-flow spaces on both sides, fluid baffles 5 are disposed on both sides.

The heat exchanger mainly comprises a shell 2 which is mainly used for bearing and supporting a heat exchange unit, and tube boxes 3 and 4 are mainly used for distributing or collecting cooling media of the heat exchange tubes. The partition plate 5 is mainly used for preventing the working medium from streaming, the corrugated pipe compensator 6 is mainly used for releasing the thermal displacement deformation of the floating pipe box, and the water inlet pipe and the water outlet pipe are mainly connected with a heat exchange medium system.

According to the temperature of the working medium or the temperature difference, the upper tube box 3 or the lower tube box 4 of the heat exchanger can be arranged into a floating structure to release thermal deformation caused by the temperature difference, and is arranged into a fixed end relative to the tube box. The floating end of the tube box is connected to the external pipe by means of a bellows compensator 6. The heat exchanger can be divided into I and II arrays along the flow passage direction, and different tube passes of the heat exchanger are realized. Wherein A, B, I, II, etc. can be randomly composed into different tube pass and shell pass arrangements. According to actual demands, an upper pipe box can be used for fixing a lower pipe box in a floating mode, a lower pipe box can be used for fixing an upper pipe box in a floating mode, and two ends can be used for fixing when the temperature difference is not large.

The water inlet and outlet modes of the heat exchanger are an upper inlet and lower outlet mode, an upper inlet and upper outlet mode, a lower inlet and lower outlet mode and a lower inlet and upper outlet mode, and if the heat exchanger needs to be horizontally installed, the direction is only required to be rotated by 90 degrees. The arrangement of the water inlet pipe and the water outlet pipe is specifically set according to the pipe pass and the shell pass.

When the heat exchanger is vertically arranged, the heat exchanger can adopt a multi-tube-pass mode of bottom water inlet, bottom water outlet and the like, or a multi-tube-pass mode of upper water inlet, upper water outlet and the like, or a mode of upper water inlet, lower water outlet/lower water inlet, upper water outlet and the like.

When the heat exchanger is horizontally arranged, the heat exchanger can adopt a multi-tube-pass mode of water inlet/outlet on the same lateral side or a mode of water inlet/outlet on the different lateral sides.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.