CN114962745A - Diaphragm pressure driving device and pressure regulating valve using same - Google Patents

Abstract

The invention discloses a diaphragm pressure driving device and a pressure control valve using the same, wherein the diaphragm pressure driving device comprises a diaphragm part and a diaphragm box part, wherein the diaphragm box part comprises an upper diaphragm box and a lower diaphragm box; the diaphragm component comprises a diaphragm and a diaphragm support, the outer edge part of the diaphragm is fixed with the diaphragm component, the diaphragm pressure driving device further comprises a first seat body and a second seat body, the first seat body can be abutted against the diaphragm support, the second seat body can be abutted against the diaphragm, the diaphragm is axially abutted against the diaphragm support, the diaphragm support comprises more than two hole parts, and the axial projection profile of the hole wall of each hole part does not comprise a concentric arc section of a radially arranged concentric circle taking the circle center of the diaphragm support as the circle center; or the axial projection profile of each hole wall comprises the concentric circular arc sections, and the sum of radians of the concentric circular arc sections with the same radius is less than 120 degrees, so that the potential defect of fatigue fracture of the diaphragm can be avoided or reduced, and the reliability of the diaphragm pressure driving device and the pressure regulating valve using the same is improved.

Description

Diaphragm pressure driving device and pressure regulating valve using same

Technical Field

The invention relates to the technical field of fluid pressure control, in particular to a diaphragm pressure driving device and a pressure regulating valve using the same.

Background

Diaphragm pressure driven devices are commonly used in the field of fluid control technology, such as pressure regulating valves comprising diaphragm pressure driven devices. Fig. 1 is a schematic structural diagram of a pressure regulating valve of the background art, fig. 2 is a schematic structural diagram of a diaphragm pressure driving device used in the pressure regulating valve, and fig. 3 is a schematic structural diagram of a matching relationship between a diaphragm 4 and a diaphragm support 3 in fig. 2.

As shown in fig. 1, 2 and 3. The diaphragm pressure driving device comprises a diaphragm cavity formed by welding an upper diaphragm capsule 1 and a lower diaphragm capsule 2, a diaphragm 4 and a diaphragm support 3 are overlapped and arranged in the diaphragm cavity, and the outer edges of the diaphragm 4 and the diaphragm support 3 are welded and fixed with the upper diaphragm capsule 1 and the lower diaphragm capsule 2. Go up pedestal 5 and lower pedestal 6 butt diaphragm support 3 and diaphragm 4 respectively, go up pedestal 5 and bear the downward effort that the outside was applyed, lower pedestal 6 bears the ascending effort that the outside was applyed, and upper and lower effort is in balanced state. The diaphragm support 3 is attached to the diaphragm 4 and moves together, the diaphragm support 3 is used for improving the strength of the diaphragm 4, a plurality of holes 31 with symmetrical axes are formed in the diaphragm support 3, and the holes 31 are used for facilitating the discharge of airflow generated by frequent movement of the diaphragm 4.

In the above configuration, the axial projection profile of the hole wall of the hole portion includes a concentric arc segment of a concentric circle centered on the axis of the diaphragm holder 3 (projection profile of the portion G, length of the concentric arc segment is K1).

In the use process of the regulating valve, the axial force applied to the diaphragm 4 frequently changes, the diaphragm 4 elastically displaces up and down, and the force deformation mode of the material is approximately diffused along concentric circles (namely r 1, r2, r3 and r4. in the figure) because the outer edge of the diaphragm 4 is fixed and the center of the diaphragm is stressed; meanwhile, the membrane 4 and the membrane support 3 are arranged in an overlying mode, the hole 31 is a fan-shaped hole, the material (G part) of the membrane 4 located at the edge of the hole 31 can be extruded to the inner wall of the hole to generate shearing force, and the circular arc section of the axial projection outline of the 4 fan-shaped holes 31 is located on the concentric circle r4. It can be seen that the diaphragm 4 is more likely to form a potential risk of fatigue fracture at the intersection of the circle r4 and the edge of the sector hole 31.

Therefore, how to avoid or reduce the potential rupture of the diaphragm by improving the structure of the diaphragm pressure regulating device is a problem to be paid attention to by those skilled in the art.

Disclosure of Invention

The invention provides a diaphragm pressure driving device, which comprises a diaphragm part and a diaphragm box part, wherein the diaphragm box part comprises an upper diaphragm box and a lower diaphragm box; the diaphragm component comprises a diaphragm and a diaphragm support, the outer edge part of the diaphragm is fixed with the diaphragm component, the diaphragm pressure driving device further comprises a first seat body and a second seat body, the first seat body can be abutted against the diaphragm support, the second seat body can be abutted against the diaphragm, the diaphragm is axially abutted against the diaphragm support, the diaphragm support comprises more than two hole parts, and the axial projection profile of the hole wall of each hole part does not comprise a concentric arc section of a radially arranged concentric circle taking the circle center of the diaphragm support as the circle center; or the axial projection profile of each hole wall comprises the concentric circular arc segments, and the sum of the radians of the concentric circular arc segments with the same radius is less than 120 degrees.

Meanwhile, the invention also provides a pressure regulating valve which comprises a valve body component, a valve core component and a regulating component, wherein the valve body component comprises a flow path inlet end part, a flow path outlet end part and a valve port part, the valve core component comprises a valve rod, the valve rod is arranged in an inner cavity of the pressure regulating valve, the valve rod comprises a valve core part, the valve core part can be matched with the valve port part to regulate the flow of the pressure regulating valve, the pressure regulating valve further comprises the diaphragm pressure driving device, one end of the valve rod is abutted against the second seat body, the other end of the valve rod is abutted against the lower valve body through an abutting spring, and a regulating spring of the regulating component is abutted against the first seat body.

According to the diaphragm pressure driving device and the pressure regulating valve using the same, the potential defect of fatigue fracture of the diaphragm can be avoided or reduced through the structural improvement of the diaphragm support, and the reliability of the diaphragm pressure driving device and the pressure regulating valve using the same is improved.

Drawings

FIG. 1: a schematic structural diagram of a pressure regulating valve in the background art;

FIG. 2: the structure of the diaphragm pressure driving device used in fig. 1 is schematic;

FIG. 3: FIG. 2 is a schematic view of the diaphragm 4 in a fitted relationship with the diaphragm support 3;

FIG. 4: the invention provides a specific structure schematic diagram of a pressure regulating valve;

FIG. 5: FIG. 4 is a schematic view of the diaphragm pressure driving device and the diaphragm and diaphragm support in combination;

FIG. 6: FIG. 5 is a top view of the part structure of the diaphragm support and diaphragm;

FIG. 7: FIG. 5 is a schematic view of the radial force analysis trend of the membrane;

FIG. 8: a diaphragm support parameter setting relation explanatory diagram of the diaphragm pressure driving device;

FIG. 9: the invention provides a specific structure schematic diagram of another membrane bracket;

FIG. 10: the invention provides a specific structural schematic diagram of a third diaphragm support.

Symbolic illustration in fig. 4-10:

1000-diaphragm pressure drive;

100-a bellows member;

110-upper capsule;

111-upper connection hole;

120-lower bellows;

121-lower connection hole;

130-upper membrane cavity; 140-lower membrane cavity;

200-a membrane part;

210/210A/210B/210C-diaphragm support;

220/220A/220B/220C-aperture;

221-circular holes;

222-a first arc portion, 223-a second arc portion;

230-a membrane;

310-a first seat body, 320-a second seat body;

400-a valve body component;

410-an upper valve body;

411-flow path outlet end;

412-an upper step;

420-a lower valve body;

421-flow path inlet end;

430-lumen;

440-a valve port portion;

500-a spool part;

510-a valve stem;

511-the valve core part;

520-an abutment spring;

600-an adjustment member;

610-an outer shell;

611-lower step;

620-adjusting the spring;

630-adjusting screws;

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. The upper and lower terms used herein are defined by the positions of the components shown in the drawings, and are only used for the sake of clarity and convenience in technical solution, and it should be understood that the terms used herein should not limit the scope of the claims; it will also be appreciated that the structural relationships illustrated herein, whether connected, secured, abutted, etc., are intended to encompass direct and indirect methods, unless specifically noted to embody the inventive concepts thereof.

Fig. 4 is a schematic diagram showing a specific structure of a pressure regulating valve according to the present invention, and fig. 5 is a schematic diagram showing a diaphragm pressure driving device, and a diaphragm support in the diagram.

As shown in fig. 4 and 5. The pressure regulating valve according to this embodiment includes a valve body member 400, a spool member 500, a regulating member 600, and a diaphragm pressure driving device 1000. The valve body part 400 includes an upper valve body 410 and a lower valve body 420, the upper valve body 410 and the lower valve body 420 are fixed by screw connection or welding, and an inner cavity 430 is formed after the upper valve body 410 and the lower valve body 420 are installed. The lower valve body 420 has a flow path inlet end 421, and the upper valve body 410 has a flow path outlet end 411 and a valve port 440.

The spool member 500 is located in the internal cavity 430, the spool member 500 includes a valve stem 510 and an abutment spring 520, and the lower end of the valve stem 510 abuts against the lower valve body 420 through the abutment spring 520.

The diaphragm pressure driving apparatus 1000 includes a diaphragm member 200, a diaphragm member 100, and a first housing 310 and a second housing 320. The bellows member 100 includes an upper bellows 110 and a lower bellows 120 formed by punching a metal sheet, and outer edge portions of the upper bellows 110 and the lower bellows 120 are fixed by welding to form a bellows chamber. The diaphragm member 200 includes a diaphragm holder 210 made of a metal sheet and a diaphragm 230 made of a composite material, and the diaphragm holder 210 is axially abutted up and down with the diaphragm 230. Similarly, the diaphragm holder 21 and the outer edge portion of the diaphragm 230 are fixed to the bellows member 100 by welding. The diaphragm member 200 separates the bellows chamber into an upper diaphragm chamber 130 and a lower diaphragm chamber 140. The first retainer 310 is at least partially disposed in the upper film cavity 130, and the second retainer 320 is at least partially disposed in the lower film cavity 140.

The adjustment member 600 includes an outer housing 610, an adjustment spring 620, and an adjustment screw 630. The set screw 630 is threadedly attached to the inner chamber wall of the outer housing 610. The upper end of the adjustment spring 620 abuts the adjustment screw 630.

The lower end of the outer shell 610 is provided with a lower step part 611, the upper diaphragm capsule 110 is provided with an upper connecting hole 111, and the outer shell 610 is fixedly connected with the upper diaphragm capsule 110 by welding after the lower step part 611 extends into the upper connecting hole 111; similarly, the upper end of the upper valve body 410 has an upper step part 412, the lower diaphragm casing 120 has a lower connection hole 121, and the upper step part 412 extends into the lower connection hole 121 and then the upper valve body 410 and the lower diaphragm casing 120 are welded and fixed by welding.

The lower end of the adjusting spring 620 abuts against the first seat 310, the first seat 310 can abut against the diaphragm bracket 210, the upper end of the valve rod 510 abuts against the second seat 320, and the second seat 320 can abut against the diaphragm 230. Thus, the upper side of the diaphragm member 200 receives the downward urging force of the adjustment screw 630, and the lower side of the diaphragm member 200 receives the urging force of the abutment spring 520 and the upward urging force of the fluid.

The valve stem 510 includes a valve core portion 511, and the valve core portion 511 is engaged with the valve port portion 440 to adjust the flow rate of fluid at the valve port. In the steady state of the pressure regulating valve, the upper/lower sides of the diaphragm member 200 are balanced in force. The fluid flow at the port of the valve port portion 440 is constant. When the acting pressure of the fluid is increased, the valve rod 510 pushes the diaphragm component 200 to move upwards after being stressed, so that the flow of the fluid at the valve port is reduced, the up/down stress balance of the diaphragm component 200 is realized at a new position, and the pressure regulating valve is in a new stable state; similarly, when the fluid pressure becomes lower and the diaphragm member 200 is unbalanced, the adjusting spring 620 pushes the diaphragm member 200 to move downward, so that the pressure adjusting valve is in a new stable state.

Fig. 6 is a top view of the part structure of the diaphragm holder and the diaphragm of fig. 5.

As shown in fig. 6. In this embodiment, the end of the diaphragm support 210 and the axial projection profile of the diaphragm 230 are both circular, and the diaphragm support 210 and the diaphragm 230 are axially concentrically disposed and in overlapping abutment. The diaphragm support 210 is provided with four circular holes 221 as the hole parts 220, the circular holes 221 are symmetrically arranged relative to the axis of the diaphragm support 210, the diameters of the circular holes 221 are the same, and the hole parts are provided for facilitating the discharge of airflow generated by frequent movement of the diaphragm.

As a specific optimization parameter design, in the above structure, it is set that: the diameter of circular hole 221 is d 2; the diameter of the circle passing through the center of each circular hole 221 is d1 (since each circular hole 221 is symmetrically arranged with respect to the axis, the center of the circle coincides with the center of the diaphragm support 210); the first seat 310 is coaxially disposed with the diaphragm support 210, and the diameter of the outer edge of the first seat is D1. When the values of D1 and D1 are substantially close to each other, the diaphragm 230 is less affected by the hole wall of the hole 220 of the diaphragm support 210 during the elastic displacement, and the influence of local uneven stress on the diaphragm 230 due to the hole of the hole 220 is reduced.

The specific parameters are selected in the range that the difference between the values D1 and D1 is 3mm, namely D1-D1 | 3mm is satisfied.

As a further optimization parameter design, in the above structure, it is set that: preferably, the diameter of the circular hole 221 is D2, the diameter of the outer edge of the diaphragm 230 is D2, and the radial width of the welding and fixing region (Q5) between the outer edge of the diaphragm 230 and the diaphragm member is a (i.e., the region where the diaphragm 230 cannot be elastically displaced), the size of D2 is substantially equal to the length of the diaphragm 230 that can be elastically displaced in the radial direction (i.e., D2 is (D2-D1)/2-a), and the difference between the values is less than 3mm in consideration of factors such as the assembly or performance influence range. Namely, the following conditions are satisfied: | D2- ((D2-D1)/2-a) | <3 mm.

As a further optimization parameter design, in the above structure, the first holder body 310, the second holder body 320, the diaphragm 230 and the diaphragm support 210 are coaxially arranged, and the diameter of the largest outer circle of the second holder body 320 contacting the diaphragm 230 is smaller than the diameter of the largest outer circle of the first holder body 310 contacting the diaphragm support 210 (i.e. as shown in fig. 5, in this embodiment, the diameter D3 of the outer edge portion of the second holder body is smaller than the diameter D1 of the outer edge portion of the first holder body).

FIG. 7 is a diagram illustrating the radial force analysis trend of the diaphragm. As shown in fig. 7, the membrane extends in the radial direction from the position of the central point 0 (points 0-5), and the above parameters select the force curve displayed in the intermediate state of the setting area: 1-3 is the position of the round hole, and 2 is the position of the center point of the round hole; 1-4 are elastically deflectable regions of the diaphragm. As can be seen from comparison of related stress curve graphs, under the state, the lifting of the peak value after the two stress curves are superposed can be reduced, namely the potential defect of fatigue fracture of the diaphragm is reduced, and the reliability of the pressure regulating valve is improved.

Fig. 8 is an explanatory diagram of the diaphragm support parameter setting relationship of the diaphragm pressure driving apparatus.

As shown in fig. 8 and with reference to fig. 4 and 5. As a specific optimized parameter design, the diaphragm support 210A is provided with more than two hole portions 220A, each hole portion 220A is not limited to be the same in shape, size and position, and the axial projection profile of the hole wall of each hole portion 220A does not include a concentric radially disposed with the axis of the diaphragm support 210 as the center of the circleConcentric arc segments of a circle. Setting: di is the diameter of a radially disposed concentric circle centered on the axis of the diaphragm support 210A (circles D1, D2, D3.. D. with different diameters radially spread from the center) _N D1, D2, D3.. D if the diaphragm holder 230 is coaxially disposed with the diaphragm 210 _N Concentric with the diaphragm mount 210); Σ Wi is the sum of the radians of the arc segments of concentric circles of the diameter Di across the aperture regions. Σ Wi and Di are synchronization variables, and when Di equals Dn, the arc value of Σ Wn is maximum. When Σ Wn<At 180 deg.. In the elastic displacement process of the diaphragm, the impact of the hole wall extrusion of the hole part 220A of the diaphragm support 210A is reduced, and the impact caused by the local uneven stress of the diaphragm 230 due to the hole of the hole part 220A is reduced.

Fig. 9 is a schematic diagram showing another specific structure of the diaphragm support according to the present invention.

As shown in fig. 9 and with reference to fig. 4 and 5. As a specific design of the optimized parameters, in this embodiment, the diaphragm support 210B is provided with a plurality of holes 220B. When the area of the annular region formed between the maximum outer circle and the minimum outer circle defined by the hole walls of the hole portions 220B in the radial direction of the diaphragm holder 210B is S1 and the sum of the areas of the axial projections of the hole regions of the hole portions 220B is Σ S2 (specifically, fig. 8, S1 is a hatched portion between the maximum outer circle Y and the minimum outer circle X and Σ S2 is the sum of the areas of the four hatched portions S2A, S2B, S2C, and S2D), Σ S1< S2/2, that is, Σ S1 is smaller than half the area of S1, the influence of the hole wall pressing of the hole portions 220B of the diaphragm holder 210B on the elastic displacement of the diaphragm is reduced, and the influence of the local force application of the diaphragm 230 due to the holes of the hole portions 220A is reduced.

The area of the annular region formed by the maximum outer circle and the minimum outer circle is S1, and the sum of the hollow areas of the hole parts 220B is Σ S2, which satisfies: Σ S1< S1/2.

Fig. 10 is a specific structural diagram of a third diaphragm support according to the present invention.

As shown in fig. 10 and with reference to fig. 4 and 5. As a specific optimization parameter design, in this embodiment, four hole portions 220C are formed on the diaphragm support 210C. The hole wall of the hole 220C includes a first arc portion 222 and a second arc portion 223, E1 and E2 are concentric circles arranged in a radial direction with the axis of the diaphragm holder 210C as a center, the E1 circle includes the first arc portion 222, and the E2 circle includes the second arc portion 223. That is, the first arc portion 222 and the second arc portion 223 are concentric arc segments of concentric circles arranged in a radial direction with the axis of the diaphragm holder 210C as a center.

In this configuration, the size of the concentric circular arc segment needs to be limited. Setting: the sum of the radians of the concentric circular arc segments with the same radius is sigma K, and the requirement that the sum of the radians of the concentric circular arc segments with the same radius is sigma K is met, wherein the sum of the radians of the concentric circular arc segments with the same radius is 120 degrees. The diaphragm is less affected by the hole wall of the hole 220C of the diaphragm holder 210C during the elastic displacement.

Specifically, in this embodiment, the sum of the radians of the circular arc segments in the circle of E1 is 4K, and the sum of the radians of the circular arc segments in the circle of E2 is also 4K, with 4K <120 °.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims (10)

1. A diaphragm pressure driving apparatus includes a diaphragm member and a diaphragm member, the diaphragm member including an upper diaphragm case and a lower diaphragm case; the diaphragm part comprises a diaphragm and a diaphragm bracket, the outer edge part of the diaphragm is fixed with the diaphragm part, the diaphragm pressure driving device also comprises a first seat body and a second seat body, the first seat body can be abutted against the diaphragm bracket, the second seat body can be abutted against the diaphragm,

the diaphragm is axially abutted against the diaphragm support, the diaphragm support comprises more than two hole parts, and the axial projection profile of the hole wall of each hole part does not comprise a concentric arc section of a radially arranged concentric circle taking the circle center of the diaphragm support as the circle center;

or the axial projection profile of each hole wall comprises the concentric circular arc segments, and the sum of the radians of the concentric circular arc segments with the same radius is less than 120 degrees.

2. The diaphragm pressure actuator of claim 1, wherein an axially projected contour of each of said orifice walls excludes said concentric circular arc segment;

setting on the diaphragm support, wherein Di is the diameter of a concentric circle which is radially arranged by taking the axis of the diaphragm support as the center of a circle, Σ Wi is the sum of radians of arc sections of the concentric circle of the diameter of Di passing through each hole part area, and when Di is equal to Dn, the radian value of Σ Wn is maximum, then the following conditions are satisfied: Σ Wn <180 °.

3. The diaphragm pressure actuator according to claim 1, wherein the axially projected contour of each of said orifice walls does not include said concentric circular arc segment, and wherein said orifice portions are two or more and said orifice portions are circular.

4. The diaphragm pressure actuator according to claim 3, wherein said first seat body has a circular shape, said first seat body and said diaphragm support are arranged concentrically in the axial direction, said hole portions are arranged symmetrically with respect to the axial center of said diaphragm support, the diameters of said hole portions are the same, and are defined such that the diameter of a circle passing through the center of said hole portions is D1, and the diameter of the outer edge portion of said first seat body is D1, which satisfies: the difference between the values of D1 and D1 is less than 3mm (i.e.: < D1-D1. agent <3 mm).

5. The diaphragm pressure actuator as claimed in claim 3, wherein said hole portions are defined by a circular diameter D2, said diaphragm outer edge portion has a diameter D2, and a radial width of a region where said diaphragm outer edge portion and said diaphragm member are welded together is a, so that: the difference between the numerical values of D2 and (D2-D1)/2-a is less than 3mm (i.e.: | D2- ((D2-D1)/2-a) | <3 mm).

6. The diaphragm pressure driving device according to any one of claims 1 to 5, wherein, in the radial direction of said diaphragm support, the area of the axial projection of the annular region formed between the maximum outer circle and the minimum outer circle defined by the hole wall of each hole portion is S1, and the sum of the areas of the axial projections of the hole regions of each hole portion is Σ S2, Σ S1< S2/2 is defined.

7. The diaphragm pressure actuator according to claim 6, wherein said first seat, said second seat, said diaphragm and said diaphragm support are axially concentrically arranged, and a diameter of a maximum outer circle of said second seat contacting said diaphragm is smaller than a diameter of a maximum outer circle of said first seat contacting said diaphragm support.

8. A pressure regulating valve, comprising a valve body component, a valve core component and a regulating component, wherein the valve body component comprises a flow path inlet end part, a flow path outlet end part and a valve port part, the valve core component comprises a valve rod, the valve rod is arranged in the inner cavity of the pressure regulating valve, the valve rod comprises a valve core part, the valve core part can be matched with the valve port part to regulate the flow of the pressure regulating valve, the pressure regulating valve is characterized by further comprising the diaphragm pressure driving device according to any one of claims 1 to 7, one end of the valve rod is abutted against the second seat body, the other end of the valve rod is abutted against the lower valve body through an abutting spring, and the regulating spring of the regulating component is abutted against the first seat body.

9. The pressure-regulating valve of claim 8, wherein said valve body assembly includes an upper valve body and a lower valve body, said upper valve body being fixedly attached to said lower valve body, said lower valve body including said flowpath inlet end, said upper valve body including said flowpath outlet end and said valve mouth.

10. The pressure-regulating valve of claim 9, wherein said lower bellows includes a lower attachment hole, and an upper end of said upper valve body extends into said lower attachment hole and is welded to said lower bellows; the upper diaphragm capsule comprises an upper connecting hole, and the lower end of the outer shell of the adjusting part extends into the upper connecting hole and is welded and fixed with the upper diaphragm capsule.

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