A new valve core flow channel structure of a labyrinth regulating valve and a design method thereof

Abstract

The application discloses a new valve core flow channel structure of a labyrinth regulating valve and a design method, and belongs to the technical field of fluid mechanics. The valve core flow channel structure comprises a plurality of pressure reduction structures arranged in sequence from a valve core inlet to a valve core outlet, and the diameters of the pressure reduction structures decrease in sequence from the valve core inlet to the valve core outlet; the plurality of pressure reduction structures from the valve core inlet adopt cylindrical throttling structures; the plurality of pressure reduction structures close to the valve core outlet adopt streamline throttling structures; the cylindrical throttling structures and the streamline throttling structures are arranged in an array mode on a valve core disc; the streamline throttling structure comprises a cylinder and two pasting surfaces; the cylinder is located in the middle, and the two pasting surfaces are arranged on the two sides of the cylinder; one end of any pasting surface is connected with the edge of the cylinder in a tangent mode, and the other end is connected with the non-cylindrical connecting end of the other pasting surface. The application can effectively reduce the cavitation rate of the flow channel outlet and improve the flow capacity of the valve core.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fluid mechanics, and particularly relates to a novel valve core flow channel structure of a labyrinth regulating valve and a design method. BACKGROUND

[0002] The energy and power systems in the fields of domestic electric power, petroleum, and chemical industry are continuously developing in the direction of large capacity, high parameter, and high efficiency. The upstream and downstream pressure difference of the supercritical and ultra-supercritical units that have been commercially used is as high as tens of megapascals or even higher. As a key device for regulating pressure and flow in the system, the regulating valve faces severe challenges in performance and stability under high pressure difference. The labyrinth regulating valve can effectively control the fluid velocity and pressure drop trend in the valve, and relieve phenomena such as cavitation, noise, and vibration. The labyrinth regulating valve is mainly composed of a valve cover, a valve stem, sealing packing, a valve core, a valve seat, and a valve body. A plurality of labyrinth flow channels are processed on the surface of the throttling disc of the valve core by chemical etching process, and the labyrinth regulating valve core is formed by stacking and welding through vacuum diffusion welding process. When the fluid passes through the labyrinth flow channels, energy dissipation occurs, the pressure is reduced, and the cavitation degree in the valve body is controlled.

[0003] However, the size of the inlet and outlet of the labyrinth regulating valve core flow channel is much smaller than the size of the inlet and outlet of the valve, and the size of the inlet and outlet of the labyrinth flow channel is usually ≤5mm, which limits the maximum flow capacity of the labyrinth regulating valve. The labyrinth regulating valve core flow channel is usually composed of multiple turns, and the number of turns increases with the increase of the upstream and downstream pressure difference of the valve, which further increases the flow resistance of the valve core. Therefore, the conventional labyrinth regulating valve cannot balance the flow velocity control, energy dissipation, and high flow capacity. According to the 2023 paper published in the 40th issue of the 12th issue of Mechanical and Electrical Engineering, "Regulating valve flow channel structure optimization based on multi-objective genetic algorithm and back propagation neural network", even if the labyrinth regulating valve is used, there is still a serious cavitation phenomenon when the outlet pressure is close to normal pressure, which is specifically manifested as the gas phase volume fraction being too high at the outlet of the labyrinth flow channel. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To this end, the purpose of the present application is to provide a novel valve core flow channel structure of a labyrinth regulating valve and a design method, which can effectively reduce the cavitation rate at the outlet of the flow channel and improve the flow capacity of the valve core.

[0006] In order to solve the above technical problems, the present application is implemented as follows:

[0007] The embodiment of the present application provides a novel valve core flow channel structure of a labyrinth regulating valve, wherein the valve core flow channel structure comprises a plurality of pressure reduction structures arranged in sequence from a valve core inlet to a valve core outlet, and the diameters of the pressure reduction structures decrease in sequence from the valve core inlet to the valve core outlet.

[0008] The several-stage pressure reduction structure from the valve core inlet adopts a cylindrical throttling structure; the several-stage pressure reduction structure close to the valve core outlet adopts a streamline throttling structure; the cylindrical throttling structure and the streamline throttling structure are arranged in an array manner on the valve core disc.

[0009] In addition, the new valve core flow channel structure of the labyrinth regulating valve according to the present application can also have the following additional technical features:

[0010] In some embodiments, the streamline throttling structure comprises a cylinder and two pasting surfaces; the cylinder is located in the middle, and the two pasting surfaces are arranged on the two sides of the cylinder; one end of any pasting surface is tangentially connected with the edge of the cylinder, and the other end is connected with the non-cylindrical connecting end of the other pasting surface.

[0011] In some embodiments, the pasting surface is an eccentric circular surface with a diameter being 2 times the diameter of the cylinder.

[0012] In some embodiments, the diameter of the cylindrical throttling structure decreases from the valve core inlet to the valve core outlet.

[0013] In some embodiments, the diameter of the cylinder of the streamline throttling structure decreases from the valve core inlet to the valve core outlet.

[0014] In some embodiments, the included angle α of the cylindrical throttling structure ranges from 5° to 15°.

[0015] The present application also provides a design method of the new valve core flow channel structure of the labyrinth regulating valve, which is used for designing the new valve core flow channel structure of the labyrinth regulating valve as described in any one of the preceding embodiments; the steps of the method comprise:

[0016] S1, obtaining the distance coefficient Δx, the outer diameter L of the valve core, the inner diameter l of the valve core and the expansion coefficient k, and calculating the circumscribed radius S1 of the first-stage cylindrical throttling structure and the inscribed radius S of the innermost side of the last-stage throttling structure according to the obtained data; n , the number n of the throttling structure stages of the valve core flow channel;

[0017] S2, determining the first-stage flow channel width w1;

[0018] S3, determining the included angle α of the cylindrical throttling structure;

[0019] S4, calculating the radius R1 of the first-stage cylindrical throttling structure according to the circumscribed radius S1 of the first-stage cylindrical throttling structure, the first-stage flow channel width w1 and the included angle α of the cylindrical throttling structure;

[0020] S5, calculating the circumscribed radius S of the i-th stage cylindrical throttling structure according to the radius R of the (i-1)-th stage cylindrical throttling structure and the first-stage flow channel width w1; iThe radius R of the i-th stage cylindrical throttling structure i , 1 < i ≤ n;

[0021] S6. Determine whether the current flow channel structure can be arranged on the current valve core based on the dimensions; if not, return to S1.

[0022] In addition, the design method of the novel valve core flow channel structure of the labyrinth-type regulating valve according to the present invention may also have the following additional technical features:

[0023] In some of these implementations, in step S1:

[0024] The outer tangent radius S1 of the first-stage cylindrical throttling structure is calculated based on the distance coefficient Δx and the outer diameter L of the valve core.

[0025] The innermost radius S of the final stage throttling structure is calculated based on the distance coefficient Δx and the valve core inner diameter l. n ;

[0026] According to the angle series n c Calculate the number of stages n of the cylindrical throttling structure in the valve core flow channel.

[0027] In some of these implementations, in step S5:

[0028] Based on the outer tangent radius S of the (i-1)th level cylindrical throttling structure i-1 The radius R of the (i-1)th stage cylindrical throttling structure i-1 The outer radius S of the i-th stage cylindrical throttling structure is calculated using the distance coefficient Δx and the expansion coefficient k. i ;

[0029] Based on the outer tangent radius S of the i-th level cylindrical throttling structure i The width w of the i-th stage flow channel i The radius R of the i-th stage cylindrical throttling structure is calculated by taking the included angle α of the cylindrical throttling structure, the distance coefficient Δx, and the expansion coefficient k. i .

[0030] In some implementations, the determination of size in step S6 includes:

[0031] Calculate the maximum radial arrangement dimension D of the valve core and the outer diameter dimension H of the flow channel structure;

[0032] Determine whether D≥H is true; if yes, it means that the current flow channel structure can be arranged on the current valve core, and the design ends; otherwise, it means that the current flow channel structure cannot be arranged on the current valve core, and return to step 1 to redesign.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] The labyrinth regulating valve new valve core flow channel structure and design method provided in the embodiment of the application utilizes vortex and impact generated in the multiple fluid distribution and combination process of the cylinder array to dissipate energy, and still maintains good flow rate control effect when the upstream and downstream pressure difference is large.

[0035] The labyrinth regulating valve new valve core flow channel structure and design method provided in the embodiment of the application adopts the structure design of the combination of the cylindrical wall surface and the streamline wall surface, can significantly reduce the influence of the valve core wall surface effect on the fluid, thereby effectively reducing the resistance of the valve core structure and improving the fluid mass flow.

[0036] The labyrinth regulating valve new valve core flow channel structure and design method provided in the embodiment of the application designs a special streamline disturbance structure at the outlet on the basis of the labyrinth throttling structure, can obviously reduce the influence of the tail wake area of the throttling structure on the flow field, improve the uniformity of the flow field, reduce the pressure loss, reduce the local low-pressure area and reduce the cavitation rate.

[0037] The labyrinth regulating valve new valve core flow channel structure and design method provided in the embodiment of the application can complete the replacement of the existing valve core without changing other structure components of the existing valve, thereby achieving the effects of reducing the cavitation rate in the valve and the resistance of the valve core structure and improving the flow capacity of the valve.

[0038] Additional aspects and advantages of the application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The labyrinth valve core flow channel structure design method flow chart disclosed for an embodiment of the application;

[0040] Figure 2 The labyrinth valve core flow channel schematic diagram disclosed for an embodiment of the application;

[0041] Figure 3 The labyrinth flow channel parameter identification diagram disclosed for an embodiment of the application;

[0042] Figure 4 The labyrinth flow channel streamline disturbance structure schematic diagram disclosed for an embodiment of the application;

[0043] Figure 5 The valve core flow channel structure and existing structure outlet cavitation rate comparison diagram disclosed for an embodiment of the application. DETAILED DESCRIPTION

[0044] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0045] The embodiments of the present application will be described in detail below with reference to the drawings and specific examples and application scenarios.

[0046] In some embodiments of the present application, a new valve core flow passage structure of a labyrinth regulating valve and a design method are provided. The valve core flow passage structure of the designed new labyrinth regulating valve adopts a throttling structure combining a cylindrical structure and a streamline structure, and is arranged in an array manner on a valve core disc. Each circle of the throttling cylindrical structure from the valve core inlet to the valve core outlet is a one-stage pressure reduction structure.

[0047] Preferably, the diameter of the cylindrical throttling structure decreases from the valve core inlet to the valve core outlet.

[0048] Preferably, the cylindrical throttling structure has the largest size at the inlet, and a large flow direction change occurs when the high-pressure fluid passes through, thereby causing an increase in energy dissipation. This design optimizes the flow rate control effect, and at the same time, since the pressure at this position is much higher than the saturated steam pressure, there is no need to worry about cavitation phenomenon.

[0049] Preferably, the diameter of the cylindrical throttling structure gradually decreases, and the fluid passage size gradually increases, so that the flow rate increase phenomenon caused by the size contraction of the flow passage does not occur in the flow process, thereby achieving good control of the flow rate and improving the mass flow rate.

[0050] Preferably, the last two levels of the cylindrical throttling structure are replaced by a streamline structure, which not only improves the uniformity of the flow field, but also reduces the size of the low-pressure area of the cylindrical throttling structure wake, prevents serious cavitation phenomenon caused by local pressure being too low, and reduces the cavitation rate of the fluid outlet.

[0051] Preferably, the number of array structures can be adjusted according to the flow demand, and if the desired value cannot be reached, the number of circumferential arrays can be continuously increased until the valve core disc is full.

[0052] The design method of the new valve core flow passage structure of the present application adopts a specific algorithm to achieve it, and the algorithm content includes:

[0053] According to the pressure difference between the upstream and downstream of the labyrinth regulating valve, the number of rotation angles n is calculated c Then, according to n c The number of cylindrical throttling structure levels n is calculated, and the number of cylindrical throttling structure levels n of the valve core flow passage of the present application is calculated by the following method:

[0054]

[0055] This is because each level of cylindrical throttling structure provides two corner throttling effect, so the number of cylinders is half of the calculation of the corner level.

[0056] The first level of cylindrical throttling structure circumscribed radius S1, calculated as follows:

[0057]

[0058] In the formula: Δx represents the distance coefficient, is the interval distance from the inscribed radius of the previous throttling structure to the circumscribed radius of the next throttling structure, 0.5mm≤Δx≤2mm; L represents the outer diameter of the valve core, usually determined by the valve design size.

[0059] The last level of throttling structure of the most inside inscribed radius S n , calculated as follows:

[0060]

[0061] In the formula: l is the inner diameter of the valve core, usually determined by the valve design size.

[0062] From the outermost, the size of the first level of cylindrical throttling structure is determined by the following formula:

[0063]

[0064] In the formula: R1 represents the radius of the first level of cylindrical throttling structure; w1 represents the flow channel width when the fluid flows through the first level of cylindrical throttling structure.

[0065] The value range of w1 is recommended to be 3mm≤w1≤10mm, and this width can be adjusted with the maximum and minimum size of the valve core. When w1 decreases, the resistance generated by throttling increases, thereby better meeting the flow rate control requirements under high pressure difference conditions and reducing the flow. Conversely, when w1 increases, the resistance generated by throttling decreases, making it difficult to meet the flow rate control requirements under high pressure difference conditions and resulting in a larger flow.

[0066] α represents the included angle of two rows of throttling structures, recommended to be 5°≤α≤15°. The larger the angle, the larger the space required for the arrangement of the throttling structure, thereby achieving better flow rate control effect. Conversely, the smaller the angle, the smaller the space required for the arrangement of the structure, resulting in a relatively general flow rate control effect.

[0067] The circumscribed radius S of the i-th level (1 i , calculated as follows:

[0068] S i =S i-1-2R i-1 -k(i-1)·Δx

[0069] In the formula: k represents the fluid gap expansion coefficient, it is suggested that 1≤k≤1.5, too large will affect the fluid control effect, or consistent with the flow passage expansion coefficient when performing series calculation;

[0070] The size of the i-th cylindrical throttling structure is determined by the following formula:

[0071]

[0072] In the formula: R i represents the radius of the i-th cylindrical throttling structure; w i represents the flow passage width when the fluid flows through the i-th cylindrical throttling structure, which is determined by theoretical calculation and can be expanded at each level according to demand.

[0073] Preferably, after positioning the size of each level of cylindrical throttling, the last two levels of cylindrical throttling structure are replaced by streamlined spoiler structure.

[0074] Preferably, the windward surface of the spoiler structure is the same as the cylindrical throttling structure, and the rear of the windward surface is tangent to the eccentric cylindrical section with a diameter of 2 times the diameter of the cylindrical structure of this level. The final eccentric section is tangent to a straight line with an angle of 15°≤β≤50° at the tail, that is, the tail angle of the streamlined structure is β.

[0075] Preferably: this streamlined structure can better realize uniformity and greatly reduce the cavitation rate. When the valve inlet pressure is 4MPa and the outlet pressure is normal pressure, the average cavitation rate of the outlet section of the labyrinth flow passage using the structure of the present application is reduced from 75.8% to 41.9% compared with the existing labyrinth flow passage.

[0076] Preferably, the spoiler structure is along the radial dimension of the valve core disc <2.5 times the size of the cylindrical throttling structure of this level.

[0077] Preferably, the throttling structure adopts the form of incomplete penetration of the valve core disc, and a plurality of cylindrical and streamlined protruding block structures are formed on the inner side of the valve core disc. Please refer to Figure 2 , a plurality of groups of groove structures are arranged on the inner side of the valve core disc, and cylindrical and streamlined protruding block structures are arranged in each group of groove structures, and the protruding block structures are arrayed.

[0078] Preferably, after the above size calculation, it is necessary to check whether the overall flow passage structure size can be completely arranged on the valve core disc, otherwise the size of the flow passage throttling element needs to be adjusted, and the calculation method is as follows:

[0079] D=S1-S n

[0080] D represents the maximum radial dimension of the valve core disc;

[0081] The determination formula is:

[0082]

[0083] If the result of the formula is true, it proves that the labyrinth flow passage structure can be arranged on the currently designed valve core disc, and the structure can be used.

[0084] If the result of the formula is false, it proves that the labyrinth flow passage structure cannot be arranged on the currently designed valve core disc, and the local details need to be adjusted.

[0085] In some embodiments of the present application, the design method of the novel valve core flow passage structure of the present application is shown in Figure 1 The steps include:

[0086] Step 1, obtain the distance coefficient Δx, the valve core outer diameter L and the valve core inner diameter l, and the expansion coefficient k;

[0087] According to the distance coefficient Δx and the valve core outer diameter L, the first-stage cylindrical throttling structure circumscribed radius S1 is calculated;

[0088] According to the distance coefficient Δx and the valve core inner diameter l, the inner tangent radius S of the innermost side of the last-stage throttling structure is calculated n ;

[0089] According to the rotation angle number n c , the valve core flow passage cylindrical throttling structure number n is calculated;

[0090] Step 2, determine the first-stage flow passage width w1;

[0091] Step 3, determine the included angle α between two rows of throttling structures, as shown in Figure 3 In each row of throttling structures, the centers of all the cylinders are coaxial, and the cylinder diameters decrease successively from the valve core inlet to the valve core outlet;

[0092] Step 4, according to the first-stage cylindrical throttling structure circumscribed radius S1, the first-stage flow passage width w1 and the throttling structure included angle α, the first-stage cylindrical throttling structure radius R1 is calculated;

[0093] Step 5, the circumscribed radius S i of the cylinder in the i-th stage throttling structure, the radius R i of the cylinder in the i-th stage throttling structure, 1

[0094] According to the circumscribed radius S i-1 of the cylinder in the i-1-th stage throttling structure, the radius R i-1, distance coefficient Δx and expansion coefficient k to calculate the circumscribed radius S of the cylinder in the i-th throttling structure i ;

[0095] According to the circumscribed radius S of the cylinder in the i-th throttling structure i , the i-th flow passage width w i , the throttling structure included angle α, distance coefficient Δx and expansion coefficient k to calculate the radius R of the cylinder in the i-th throttling structure i ;

[0096] Step 6, judge whether the current designed flow passage structure can be arranged on the current valve core;

[0097] The judgment method is through size judgment;

[0098] Calculate the maximum radial arrangement size D of the valve core and the outer diameter size H of the flow passage structure;

[0099] Judge whether D is greater than or equal to H, if yes, it means that the current designed flow passage structure can be arranged on the current valve core; otherwise, it means that the current designed flow passage structure cannot be arranged on the current valve core, return to step 1 to redesign.

[0100] Embodiment 1:

[0101] The flow passage structure calculated under the condition of inlet pressure of 4MPa and outlet pressure of atmospheric pressure, the valve core flow passage throttling stage is 7, the flow passage inlet width w1 is 6mm, the flow passage expansion coefficient k is 1.05, and the flow passage distance coefficient Δx is 0.5mm. The calculated disc form is as shown in Figure 2 , and the specific structure is as follows:

[0102] The diameter of the cylindrical throttling structure decreases from the valve core inlet to the outlet; the cylindrical throttling structure has the largest size at the inlet, and a large flow direction change occurs when the high-pressure fluid passes through, thereby increasing the energy dissipation; from the valve core inlet to the outlet, the diameter of the cylindrical throttling structure gradually decreases, and the fluid passage size gradually increases.

[0103] This design optimizes the flow rate control effect and improves the flow capacity of the valve core. Under the condition of inlet pressure of 4MPa and outlet pressure of atmospheric pressure, the maximum flow rate in the flow passage is less than 85m / s, and the mass flow rate of a single flow passage is 1.31kg / s.

[0104] The last two levels of cylindrical throttling structure are replaced by streamlined structure, which improves the uniformity of the flow field and prevents serious cavitation phenomenon caused by local low pressure.

[0105] The cylindrical throttling structure and the streamlined throttling structure are arranged in an array manner on the valve core disc. Figure 2Four strands array is shown. The number of strands structure can affect the flow, and has no essential influence on the actual pressure reduction process in the flow field, so the flow can be increased by increasing the number of arrays.

[0106] The size of the valve core flow passage structure is designed. The specific calculation content includes:

[0107] According to the actual situation of the valve, the required pressure reduction stage n is calculated c Then, the required stage n of the cylindrical throttling structure required by the flow passage of this embodiment is calculated according to the following formula.

[0108]

[0109] If the existing valve is modified, the outer diameter L and the inner diameter l of the existing valve core need to be input; if the structure of the new valve is designed, the outer diameter L and the inner diameter l of the valve core are input according to the design requirements.

[0110] The required valve core distance coefficient Δx is input, which is the interval distance from the inscribed radius of the previous throttling structure to the circumscribed radius of the next throttling structure, which is specifically shown in Figure 3 It is recommended that 0.5mm≤Δx≤2mm, and too large will affect the flow rate control effect of the flow passage.

[0111] The fluid gap expansion coefficient k is input, which is recommended to be 1≤k≤1.5, and too large will affect the fluid control effect, or keep consistent with the flow passage expansion coefficient when calculating the stage.

[0112] The circumscribed radius S1 of the first cylindrical throttling structure is calculated according to the input data, and the specific calculation method is as follows:

[0113]

[0114] The inscribed radius S of the last throttling structure is calculated according to the input data n , and the specific calculation method is as follows:

[0115]

[0116] The flow passage width w1 of the fluid flowing through the first cylindrical throttling structure is input. The flow passage of the labyrinth valve is usually small, and if there is no special provision, it is recommended that 3mm≤w1≤10mm. This width can be adjusted with the maximum and minimum size of the valve core. When w1 decreases, the resistance generated by throttling increases, thereby better meeting the flow rate control requirements under high pressure difference conditions and reducing the flow. Conversely, when w1 increases, the resistance generated by throttling decreases, making it difficult to meet the flow rate control requirements under high pressure difference conditions and resulting in a larger flow.

[0117] The input throttling structure included angle a, suggest 5 °≤a≤15 °, the greater the angle, the greater the space required for the arrangement of the throttling structure, thereby achieving better flow rate control effect; conversely, the smaller the angle, the smaller the space required for the arrangement of the structure, resulting in a relatively general flow rate control effect.

[0118] First, the radius of the first stage cylindrical structure of the throttling structure needs to be determined according to the input data, which is as follows:

[0119]

[0120] Second, the size of the subsequent structure is calculated according to the first stage structure, which is as follows:

[0121] The circumscribed radius S of the cylinder in the i-th stage (1 i , throttling structure is calculated as follows:

[0122] S i = S i-1 -2R i-1 -k(i-1)·Δx

[0123] The radius R of the cylinder in the i-th stage throttling structure i is determined by the following formula:

[0124]

[0125] Finally, the last two stages of the structure need to be changed to streamline structure based on the cylindrical throttling structure, and it is necessary to check whether the overall flow passage structure size can be completely arranged on the valve core disc, which is as follows:

[0126] Change of streamline turbulence structure, labyrinth flow passage streamline turbulence structure is shown Figure 4 :

[0127] First, the windward surface of the turbulence structure is the same as the cylindrical throttling structure;

[0128] Second, the back of the windward surface is tangent to the eccentric circular surface with a diameter of twice the cylindrical structure;

[0129] Finally, the eccentric section is tangent to a straight line with 15 °≤β≤50 °.

[0130] Check the size of the flow passage structure:

[0131] The overall flow passage structure size needs to be checked whether it can be completely arranged on the valve core disc, otherwise the size of the flow passage throttling element needs to be adjusted, and the calculation method is as follows:

[0132] D=S1-S n

[0133] In the formula: D represents the maximum radial arrangement size of the valve core disc;

[0134] Determination:

[0135]

[0136] If the above formula is true, it proves that the labyrinth flow passage structure can be arranged on the currently designed valve core disc, and the structure is available; if the above formula is false, it proves that the labyrinth flow passage structure cannot be arranged on the currently designed valve core disc, and the structure parameters of the flow passage input need to be adjusted again for calculation.

[0137] Please refer to Figure 5 As shown, compared with other flow passage types, the structural form of the present application significantly reduces the cavitation rate of the fluid outlet. The average cavitation rate of the outlet cross section is reduced from 75.8% to 41.9%, and the maximum cavitation rate in the flow passage is reduced from more than 95% to 65%.

[0138] The present application can adjust the number of array structures according to the flow demand. If the desired value cannot be reached, the number of circumferential arrays can be continuously increased until the valve core disc is filled. The flow passage structure of the present embodiment only occupies half of the area of the valve core disc, and the flow passage can be further increased to further increase the flow capacity of the valve core.

[0139] The parts of the present application not described in detail can refer to the existing technology in the art or the technology known to those skilled in the art.

[0140] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments. The above specific embodiments are only illustrative and not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, which all belong to the protection of the present application.

Claims

1. A design method of a new valve core flow passage structure of a labyrinth regulating valve, characterized by, The steps of the method include: S1, the distance coefficient , the outer diameter of the valve core L , the inner diameter of the valve core l、 , the rotation angle level n c and the expansion coefficient k , and according to the obtained data, the first level of the cylinder throttling structure circumscribed radius S 1, the last level of the throttling structure innermost inscribed radius S n , the throttling structure level of the valve core flow passage n ; the distance coefficient is the interval distance from the inscribed radius of the upper level of the throttling structure to the circumscribed radius of the lower level of the throttling structure; the rotation angle level n c According to the pressure difference between the upper and lower streams of the labyrinth regulating valve S2, determining the first stage runner width w 1; S3, determining the included angle of the cylindrical throttling structure α ; α represents the included angle of the two rows of throttling structures; S4, the outer radius of the first stage cylindrical throttle structure S 1, the width of the first stage flow channel w 1, the included angle of the cylindrical throttle structure α calculating the radius of the first stage cylindrical throttle structure R 1; S5, Calculate the... i External tangent radius of the throttling structure S i , No. i Radius of the throttling structure R i ,1< i ≤n; when the throttling structure is a cylindrical throttling structure, the radius R i The radius of the cylinder in the throttling structure is the circumferential radius. S i The radius is the external tangent radius of the cylinder in the throttling structure; when the throttling structure is a streamlined throttling structure, the radius is... R i The radius of the cylinder in the streamlined throttling structure, the circumferential radius S i The outer radius of the cylinder in the streamlined throttling structure; S6, judging by size whether the current design of the flow channel structure can be arranged on the current valve core; if not, returning to S1; In step S1: According to the distance coefficient And the outer diameter of the valve core L The first-stage cylindrical throttling structure circumscribed radius is calculated S 1; According to the distance coefficient and the inner diameter of the valve core l Calculate the inner tangent radius of the innermost side of the final throttling structure S n ; According to the number of turns n c The number of turns of the cylindrical throttling structure of the spool flow passage is calculated n .

2. The new trim flow passage structure and design method of a labyrinth control valve according to claim 1, characterized in that, In step S5: According to the first i -1 level cylindrical throttling structure circumscribed radius S i-1 , the first i -1 level cylindrical throttling structure radius R i-1 , distance coefficient and expansion coefficient k The calculated first i level cylindrical throttling structure circumscribed radius S i ; According to the first i The outer radius of the first S i , the second i The width of the second w i , the included angle of the first α , the distance coefficient , and the expansion coefficient k The radius of the first i R i .​ 3. The new trim flow passage structure and design method of a labyrinth control valve according to claim 1, characterized in that, The content of judging by size in step S6 includes: Computing the radial maximum arrangement dimension of the valve core D And the outer diameter dimension of the flow channel structure H ; determine D H is true, it means that the flow passage structure of the current design can be arranged on the current spool, and the design is completed; otherwise, it means that the flow passage structure of the current design cannot be arranged on the current spool, and the process returns to step S1 to redesign.

4. A new valve core flow passage structure of a labyrinth regulating valve, characterized by, The valve core flow channel structure is designed by the new valve core flow channel structure and design method of any one of claims 1-3; the valve core flow channel structure includes a plurality of stages of pressure reduction structures arranged in sequence from the valve core inlet to the valve core outlet, and the diameters of the pressure reduction structures decrease in sequence from the valve core inlet to the valve core outlet; The plurality of stages of pressure reduction structures from the valve core inlet are cylindrical throttling structures; the plurality of stages of pressure reduction structures close to the valve core outlet are streamline throttling structures; the cylindrical throttling structures and the streamline throttling structures are arranged in an array on the valve core disc.

5. The new valve trim flow passage structure for a labyrinth trim valve according to claim 4, wherein The streamline throttling structure includes a cylindrical shape and two surface shapes; the cylindrical shape is located in the middle, and the two surface shapes are arranged on both sides of the cylindrical shape; one end of any surface shape is tangentially connected with the edge of the cylindrical shape, and the other end is connected with the non-cylindrical connecting end of the other surface shape.

6. The new valve trim flow passage structure for a labyrinth trim valve according to claim 5, wherein The surface shape is an eccentric circular surface with a diameter twice that of the cylindrical shape.

7. The new valve trim flow passage structure for a labyrinth trim valve according to claim 4, wherein The diameters of the cylindrical throttling structures decrease in sequence from the valve core inlet to the valve core outlet.

8. The new valve trim flow passage structure for a labyrinth trim valve according to claim 6, wherein The diameters of the cylindrical shapes of the streamline throttling structures decrease in sequence from the valve core inlet to the valve core outlet.

9. The new valve trim flow passage structure for a labyrinth trim valve according to claim 4, wherein The included angle of the throttle structure α is 5°≤ α ≤15°, α which represents the included angle of the two rows of throttle structures.

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