1. A method for determining the equal percentage throttling sleeve opening of a sleeve regulating valve is characterized by comprising the following steps:

obtaining design parameters of the sleeve regulating valve: valve inlet area A₁Rated flow coefficient C_vmaxAdjustable ratio R, maximum stroke L_maxAnd each opening stroke L_i；

Determining the flow coefficient: determining the flow coefficient C when the opening of the sleeve regulating valve i is determined according to design parameters_vi；

Determining the flow area: according to the sleeve regulating valve flow coefficient C_viAnd the area of the inlet end of the valve A₁The flow area A of the throttle sleeve when the opening degree of the throttle sleeve is obtained_i；

Determining the flow area variation: determining correction coefficient alpha of flow area variation of each opening throttle sleeve through simulation_iThereby, the flow area variation A 'of the throttle sleeve at each opening degree of the control valve is determined'_i；

Determining the diameter of the opening hole: a 'is given according to the principle that the increment of the total area of the small holes under each opening degree is equal to the variation of the flow surface'_iCorresponding number n of small holes_iTo determine the orifice diameter d'_i。

2. The method of claim 1 for determining an equal percentage throttling sleeve opening for a sleeve regulator valve, wherein: flow area A of throttle sleeve at i opening degree_iAnd the area of the inlet end of the valve A₁The following relationship is satisfied:

3. the method of claim 2 for determining an equal percentage throttling sleeve opening of a sleeve regulator valve, wherein: the flow coefficient satisfies the following relationship:

4. the method of claim 3 for determining an equal percentage throttling sleeve opening for a sleeve regulator valve, wherein: a'_iThe following relationship is satisfied:

5. the method of claim 1 for determining an equal percentage throttling sleeve opening for a sleeve regulator valve, wherein: correction coefficient alpha of flow area variation of each opening_iThe determination steps are as follows:

determining the number of small holes of the throttling sleeve under the 10% opening of the regulating valve, and setting alpha to be preset_10％To thereby determine d'_10％(ii) a Carrying out initial model establishment and simulation calculation of 10% opening of the regulating valve, and obtaining simulation C of the regulating valve through a flow coefficient calculation formula_v10％(ii) a Determination of theory C by equal percent flow characteristic relation_v10％(ii) a Theory of contrast C_v10％And simulation C_v10％If the error is within 10%, determining alpha_10％Otherwise, adjust α_10％Until the requirements are met; determining the number of small holes of the throttling sleeve under the opening degree of 20%, 30%. cndot.. 100% of the regulating valve according to alpha_10％Determination method, determining alpha in turn_20％、α_30％、...、α_100％The size of (2).

6. The method of claim 5 for determining an equal percentage throttling sleeve opening for a sleeve regulator valve, wherein: the number of the small holes is 12 when the opening of the regulating valve is 10%.

7. The method of claim 6 for determining an equal percentage throttling sleeve opening for a sleeve regulator valve, wherein: the number of the small holes is 6, 9, 12 and 18 when the opening degree of the regulating valve is 20%, 30%, 40% and 50%.

8. The method of claim 7 for determining an equal percentage throttling sleeve opening for a sleeve regulator valve, wherein: the number of the small holes is 16, 24, 15, 24 and 24 when the opening degree of the valve is adjusted to be 60%, 70%, 80%, 90% and 100%.

9. The equal-percentage throttling sleeve opening determination method for the sleeve regulating valve according to any one of claims 5 to 8, characterized in that: d'_10％＝d′_20％＝d′_30％＝d′_40％＝d′_50％。

10. The cartridge adjustment of claim 9The method for determining the opening of the throttle sleeve with equal percentage of the valve is characterized by comprising the following steps: d'_60％＝d′_70％、d′_80％＝d′_90％。

Background

The sleeve regulating valve is widely applied to fluid control under high-pressure working conditions such as nuclear power, chemical engineering and the like based on excellent pressure reduction and noise reduction and liquid cavitation inhibition effects. As the domestic regulating valve technology development starts late, the design research on the throttling sleeve is relatively less, most enterprises still quote foreign technologies imported in the 90 s, the specifications are less, and C is_vThe value selection range is narrow, the method can not meet the development requirements of the modern diversified process, and particularly the special C with large adjustable ratio, high precision and other percentage flow regulation characteristics_vThe sleeve needs to spend a large amount of time and relies on experience to carry out analysis design, and the design precision is lower, and some extreme operating mode often need carry out sleeve governing valve's purchase abroad. Based on the design method, the invention provides a design method of an equal-percentage throttling sleeve of a sleeve regulating valve.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method for determining an opening diameter of an equal percentage throttling sleeve of a sleeve regulating valve, which is used for solving the problem of determining the opening diameter of the equal percentage throttling sleeve of the sleeve regulating valve in the prior art.

To achieve the above and other related objects, the present invention provides a method for determining the opening of an equal percentage throttling sleeve of a sleeve regulating valve, comprising:

obtaining design parameters of the sleeve regulating valve: valve inlet area A₁Rated flow coefficient C_vmaxAdjustable ratio R, maximum stroke L_maxAnd each opening stroke L_i；

Determining the flow coefficient: determining the flow coefficient C when the opening of the sleeve regulating valve i is determined according to design parameters_vi；

Determining the flow area: according to the sleeve regulating valve flow coefficient C_viAnd the area of the inlet end of the valve A₁The flow area A of the throttle sleeve when the opening degree of the throttle sleeve is obtained_i；

Determining the flow area variation: determining correction coefficient alpha of flow area variation of each opening throttle sleeve through simulation_iThereby determining the flow area variation A of the throttle sleeve at each opening of the regulating valve_i′；

Determining the diameter of the opening hole: according to the principle that the total area increment of the small holes under each opening degree is equal to the variable quantity of the flow surface of the small holes, A is given_i' number of corresponding apertures n_iTo thereby determine the diameter d of the orifice_i′。

Optionally, the flow area a of the throttle sleeve at i opening degree_iAnd the area of the inlet end of the valve A₁The following relationship is satisfied:

optionally, the flow coefficient satisfies the following relationship:

optionally, A is_i' the following relationship is satisfied:

optionally, the correction coefficient α of the variation of the flow area of each opening degree_iThe determination steps are as follows:

determining the number of small holes of the throttling sleeve under the 10% opening of the regulating valve, and setting alpha to be preset_10％To thereby determine d'_10％(ii) a Carrying out initial model establishment and simulation calculation of 10% opening of the regulating valve, and obtaining simulation C of the regulating valve through a flow coefficient calculation formula_v10％(ii) a Determination of theory C by equal percent flow characteristic relation_v10％(ii) a Theory of contrast C_v10％And simulation C_v10％If the error is within 10%, determining alpha_10％Otherwise, adjust α_10％Until the requirements are met; determining the regulating valve 20%, 30%The number of small holes of the throttle sleeve at 100% opening is based on alpha_10％Determination method, determining alpha in turn_20％、α_30％、...、α_100％The size of (2).

Optionally, the number of the small holes is 12 when the opening of the regulating valve is 10%.

Optionally, the number of the small holes is 6, 9, 12 and 18 when the opening degree of the regulating valve is 20%, 30%, 40% and 50%.

Optionally, the number of the small holes is 16, 24, 15, 24 and 24 when the opening degree of the regulating valve is 60%, 70%, 80%, 90% and 100%.

Optionally, d'_10％＝d′_20％＝d′_30％＝d′_40％＝d′_50％。

Optionally, d'_60％＝d′_70％、d′_80％＝d′_90％。

As described above, the method for determining the opening of the equal-percentage throttling sleeve of the sleeve regulating valve at least has the following beneficial effects:

can confirm percentage throttle sleeve trompil apertures such as sleeve governing valve, and then realize the quick design of throttle sleeve trompil, and can guarantee the adjustment performance and the precision of governing valve. Compared with the traditional empirical hole opening design method, the method can improve the hole opening design efficiency of the throttling sleeve, increase the design specification of the sleeve regulating valve and increase the C_vThe value selection range improves the design precision and can ensure the control precision.

Drawings

FIG. 1 shows a correction coefficient α of the variation of the flow area according to the present invention_iA block flow diagram is determined.

FIG. 2 shows DN50-C as per the present invention_v24 sleeve model schematic of sleeve regulator valve.

FIG. 3 shows DN50-C as per the present invention_vFlow field analysis schematic of 24 sleeve modulation valve model.

FIG. 4 shows DN250-C as per the present invention_v450 sleeve model schematic of sleeve regulator valve.

FIG. 5 shows DN250-C as per the present invention_v450 a schematic view of a flow field analysis of a cartridge damper model.

FIG. 6 shows DN500-C as per the present invention_v1860 sleeve model schematic representation of a sleeve regulator valve.

FIG. 7 shows DN500-C as per the present invention_v1860 flow field analysis schematic of a sleeve regulator valve model.

FIG. 8 shows DN50-C as per the present invention_v24-spool regulator valve theoretical and simulated flow characteristics.

FIG. 9 shows DN250-C as per the present invention_v450 sleeve regulator valve theoretical and simulated flow characteristics.

FIG. 10 shows DN500-C as per the present invention_v1860 sleeve regulator valve theory and simulation flow characteristic curve.

Detailed Description

The following description illustrates embodiments of the present invention with reference to specific embodiments, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure herein.

Please refer to fig. 1 to 10. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower" and "a" as used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as the scope of the present invention.

The following examples are for illustrative purposes only. The various implementation examples may be combined, and are not limited to what is presented in the following single implementation example.

Referring to fig. 1, the present invention provides a method for determining the opening of an equal-percentage throttling sleeve of a sleeve regulating valve, including:

s1, obtaining design parameters of the sleeve regulating valve: valve inlet area A₁Rated flow coefficient C_vmaxAdjustable ratio R, maximum stroke L_maxAnd each opening stroke L_i；

S2, determining the flow coefficient: determining the flow coefficient C when the sleeve regulating valve is at the opening degree of i% according to design parameters_vi(ii) a Optionally, the flow coefficient satisfies the following relationship:

s3, determining a flow area: according to the sleeve regulating valve flow coefficient C_viAnd the area of the inlet end of the valve A₁The flow area A of the throttle sleeve when the opening degree of the throttle sleeve is obtained_i；

S4, determining the flow area variation amount: determining correction coefficient alpha of flow area variation of each opening throttle sleeve through simulation_iThereby determining the flow area variation A of the throttle sleeve at each opening of the regulating valve_i'; optionally, A is_i' the following relationship is satisfied:

s5, determining the diameter of the opening: according to the principle that the total area increment of the small holes under each opening degree is equal to the variable quantity of the flow surface of the small holes, A is given_i' number of corresponding apertures n_iTo thereby determine the diameter d of the orifice_i′。

Can confirm percentage throttle sleeve trompil apertures such as sleeve governing valve, and then realize the quick design of throttle sleeve trompil, and can guarantee the adjustment performance and the precision of governing valve. Compared with the traditional empirical hole opening design method, the method can improve the hole opening design efficiency of the throttling sleeve, increase the design specification of the sleeve regulating valve and increase the C_vValue selection range, improved design precision, and ensured performanceAnd controlling the precision.

In this embodiment, the specific derivation process is as follows:

according to hydrodynamics, a Bernoulli equation from an inlet (subscript 1) of a sleeve regulating valve horizontally arranged on a pipeline to a position (subscript i) of the minimum throttling opening of the sleeve is shown as a formula (1), a piezometer pipe water head is shown as a formula (2), and a continuity equation is shown as a formula (3).

The united type (1), (2) and (3) can obtain:

in the formula: p is a radical of₁、v₁、d₁Respectively the medium pressure (Pa), the medium flow speed (m/s) and the diameter (m) at the inlet end of the sleeve regulating valve; p is a radical of_i、v_i、d_iRespectively regulating the medium pressure (Pa), the medium flow speed (m/s) and the equivalent diameter (m) at the minimum throttle opening of the sleeve of the valve sleeve by the sleeve; h is a piezometer tube water head (m); rho is the density of the medium (kg/m)³) (ii) a g is gravity acceleration (m/s)²) (ii) a Q is the medium flow (m)³/s)；A₁For regulating the area (m) of the inlet end of the valve²)。

(4) In the formulaThe unit of each parameter is respectively as follows: a. the₁，cm²；p₁、p_iAnd the pressure difference delta from the inlet of the sleeve regulating valve to the position of the minimum throttle opening of the sleevep＝p₁-p_i，100kgf/cm²；d₁、d_i，cm；ρ，g/cm³；g＝981cm/s²；Q，m³H is used as the reference value. (4) The formula can be simplified to the formula (5).

The flow coefficient K when the opening of the valve i is adjusted_viComprises the following steps:

wherein:

furthermore, K can be set according to the regulation of GB/T17213_viConversion to C_viThe specific conversion relationship is as follows:

C_vi＝1.156K_vi(8)

the flow area A of the sleeve adjusting valve i when the opening degree is obtained by combining (6), (7) and (8)_iComprises the following steps:

(9) formula (I) is substituted into the correction coefficient alpha_i(α_i> 0) of the sleeve is expressed as a flow area change amount A when the sleeve control valve i is opened_i' equation (11) is obtained by parallel connection of the functional relation equation (10) of the equal percentage flow characteristics.

In addition, the sleeve of the sleeve regulating valve is provided with a round small hole, and the assumption is similar to A_i' the number of corresponding holes is n_iThe diameter of the small hole is d_i' if the total increase in the area of the orifice at each opening is equal to the amount of change in the flow surface, equation (12) is satisfied.

Simultaneous formulae (11) and (12), when n is_iAfter setting, the diameter d of the small hole of the sleeve under each opening degree of the regulating valve can be calculated_i' and then the orifice of the throttling sleeve can be designed.

In this embodiment, please refer to fig. 1 to 10, the correction coefficient α of the variation of the flow area of each opening_iThe determination steps are as follows:

determining the number of small holes of the throttling sleeve under the 10% opening of the regulating valve, and setting alpha to be preset_10％To thereby determine d'_10％(ii) a Carrying out initial model establishment and simulation calculation of 10% opening of the regulating valve, and obtaining simulation C of the regulating valve through a flow coefficient calculation formula_v10％(ii) a Determination of theory C by equal percent flow characteristic relation_v10％(ii) a Theory of contrast C_v10％And simulation C_v10％If the error is within 10%, determining alpha_10％Otherwise, adjust α_10％Until the requirements are met; determining the number of small holes of the throttling sleeve under the opening degree of 20%, 30%. cndot.. 100% of the regulating valve according to alpha_10％In turn, to determine alpha_20％、α_30％、...、α_100％The size of (2). Optionally, the number of the small holes is 12 when the opening of the regulating valve is 10%. Optionally, the number of the small holes is 6, 9, 12 and 18 when the opening degree of the regulating valve is 20%, 30%, 40% and 50%. Optionally, the number of the small holes is 16, 24, 15, 24 and 24 when the opening degree of the regulating valve is 60%, 70%, 80%, 90% and 100%. The number of the small holes under each opening degree can be properly selected according to the requirement of valve adjustment precision, and when the required precision is higher, the number of the small holes can be increased to carry out reasonable hole distribution design. By the above method, it is ensuredCorrection coefficient alpha of final flow area variation under each opening degree of fixed sleeve regulating valve_iAnd the coefficient is suitable for the design of the same type of regulating valve sleeve.

Through theoretical calculation and simulation calculation, DN50-C is obtained_v24、DN250-C_v450 and DN500-C_vThe theoretical flow coefficient, the simulated flow coefficient and the relative error magnitude of the theoretical flow coefficient and the simulated flow coefficient at each opening of the 1860 sleeve regulating valve are shown in table 1.

TABLE 1 data sheet of sleeve regulating valve flow coefficient

As can be seen from Table 1, DN50-C_vAnd the relative errors of the rest opening simulation and theoretical flow coefficient are within 10% except 10% of the 24 sleeve regulating valve, and the relative precision is high. DN250-C_v450 and DN500-C_v1860 sleeve governing valve, all opening simulation and theoretical flow coefficient relative error all are within 10%, and relative precision is higher. In addition, the data demonstrates the correctness of the design based on theory.

As can be seen from fig. 8, 9 and 10: DN50-C with adjustable ratio of 50:1_v24、DN250-C_v450 and DN500-C_v1860 sleeve governing valve, the simulation flow characteristic curve is identical with theoretical flow characteristic curve completely, has proved to have rationality to throttle sleeve design based on theoretical research, has also proved the exactness of this theoretical design method simultaneously.

In the embodiment, in order to save the processing cost, the diameters of the small holes under partial opening degrees can be equal, so that the small holes can be processed as many as possible by adopting fewer drill bit tools. Specifically, d 'may be set by sequentially adjusting the opening degrees of 10%, 20%, 30%, 40% and 50% to 12, 6, 9, 12 and 18 of the small holes'_10％＝d′_20％＝d′_30％＝d′_40％＝d′_50％At this time, the correction coefficient under 10% opening degree only needs to be determined, and the correction coefficients under 20%, 30%, 40% and 50% opening degree do not need to be determined; 60% and 70% opening degree of the regulating valveD 'when the number of the secondary sampling pores is 16 to 24'_60％＝d′_70％Determining the correction coefficient under the opening degree of 60%, and omitting the step of determining the correction coefficient under the opening degree of 70%; d 'is adjusted to the opening degree of 80 percent and 90 percent respectively when the number of the small holes is 15 and 24'_80％＝d′_90％The correction coefficient at 80% opening may be determined, and the step of determining the correction coefficient at 90% opening may be omitted.

In conclusion, the method and the device can determine the hole diameters of the equal-percentage throttling sleeve openings of the sleeve regulating valve, so that the quick design of the throttling sleeve openings is realized, and the regulating performance and the precision of the regulating valve can be ensured. Compared with the traditional empirical hole opening design method, the method can improve the hole opening design efficiency of the throttling sleeve, increase the design specification of the sleeve regulating valve and increase the C_vThe value selection range improves the design precision and can ensure the control precision. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing illustrative embodiments have been provided merely to illustrate the principles of the invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.