Plastic pneumatic diaphragm valve

Abstract

The utility model discloses a plastic pneumatic diaphragm valve which comprises an upper cover, a lower shell and a valve body, and the lower shell is fixedly arranged on the valve body and fixedly connected with the upper cover through a first clamping assembly. Axial limiting can be achieved through relative rotation during assembly, on one hand, overall assembly of the device is facilitated, spring elasticity borne by the piston can be overcome during assembly and disassembly of the device and the piston, the risk that the upper cover bounces open is avoided, and when a flow channel of the valve body is controlled to be opened and closed, the indicator can adjust the relative position to the upper cover along with movement of the piston, and the safety of the device is improved. And the working condition of the diaphragm piece can be judged by observing the length of the indicator extending out of the upper cover, so that an operator can more accurately and intuitively control the opening and closing states of the valve body.

Description

Technical Field

[0001] The utility model relates to the technical field of opening and closing valve devices, in particular to a plastic pneumatic diaphragm valve. Background Art

[0002] With the rapid development of the semiconductor industry, chips are widely used in various fields. In the manufacturing process of chips, a large amount of strong acid and strong alkali liquids are used. The existing diaphragm valves for conveying strong acid and strong alkali liquids are generally made of plastic. According to the state of liquid circulation, they are divided into normally open diaphragm valves, normally closed diaphragm valves and double pneumatic diaphragm valves.

[0003] like Figure 1 As shown, the existing normally closed diaphragm valve mainly includes: an actuator upper cover (1), an actuator lower shell (2), a piston (3), a diaphragm (4), a valve body (5), a base (6), and a spring (7). When the air inlet of the actuator lower shell (2) is ventilated, the piston (3) will overcome the pressure of the spring (7) between the actuator upper cover (1) and the piston (3); thereby, the piston (3) drives the diaphragm (4) to move upward to open the seal with the center hole of the valve body (6), and the liquid can flow in through the inlet of the valve body (5) and flow out from the outlet through the center hole. The piston (3) and the diaphragm (5) are matched by threads, and the actuator upper cover (1), the actuator lower shell (2), the valve body (5) and the base (6) are fixed by bolts and nuts.

[0004] It can be seen from the above technical solutions of the existing normally closed diaphragm valve that there is a spring (7) between the actuator upper cover (1) and the actuator lower shell (2). When the two are fixed and installed by bolts, the elastic force of the spring (7) must be overcome, which is not easy to install, and there is a risk that the spring (7) will bounce off the actuator upper cover (1) when disassembling. At the same time, the diaphragm (4) is an internal component, and the actual opening status cannot be seen from the outside. There is a situation where the inflation port is inflated but the diaphragm cannot be opened, which is not conducive to the operator's accurate control of the working status of the valve body. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model provides a plastic pneumatic diaphragm valve which is portable and safe to install and allows operators to accurately control the working state of the valve body.

[0006] In order to achieve the above objectives, the utility model is implemented through the following technical solutions.

[0007] The present application provides a plastic pneumatic diaphragm valve, comprising an upper cover, a lower shell, a valve body, a spring, a piston, a sealing ring, a diaphragm member, and an indicator, wherein the lower shell is fixedly arranged on the valve body and is fixedly connected to the upper cover through a first clamping assembly;

[0008] A flow channel is provided through the valve body, a pressure chamber is provided in the upper cover and / or the lower shell, and the spring and the piston are arranged in the pressure chamber;

[0009] The diaphragm is connected to the end of the piston close to the valve body through a thread and can block or open the flow channel with the movement of the piston. The indicator is fixed to the end of the piston away from the valve body through a second clamping assembly and extends away from the end of the valve body to the outside of the upper cover.

[0010] Wherein, a first pressure inlet which is in communication with the outside and capable of pressurizing the pressure chamber is provided on the inner wall of the pressure chamber of the upper cover, and the piston has a movement tendency to move toward a side close to the valve body when the first pressure inlet is pressurized;

[0011] And / or a second pressure inlet connected to the outside and capable of pressurizing the pressure chamber is provided on the inner wall of the pressure chamber of the lower shell, and the piston has a tendency to move away from the valve body when the second pressure inlet is pressurized.

[0012] Further defined, in the above-mentioned plastic pneumatic diaphragm valve, the first clamping assembly includes an embedded portion coaxial with the piston and an embedded cavity embedded with the embedded portion, the embedded portion is fixedly arranged at one end of two opposite ends between the upper cover and the lower shell, and the embedded cavity is arranged at the other end of the two opposite ends between the upper cover and the lower shell;

[0013] Wherein, a first positioning boss is fixedly provided on the inner wall of the embedding cavity, and a first limiting groove capable of cooperating and engaging with the first positioning boss is provided on the outer circumferential surface of the embedding portion;

[0014] Or a first limiting groove is fixedly provided on the inner wall of the embedding cavity, and a first positioning boss which can be engaged with the first positioning boss is provided on the outer circumferential surface of the embedding portion.

[0015] It is further defined that in the above-mentioned plastic pneumatic diaphragm valve, a plurality of the first positioning bosses and a plurality of the first limiting grooves are provided, and the plurality of the first positioning bosses and the first limiting grooves are arranged in a ring array about the central axis of the embedding portion;

[0016] Wherein, the plurality of first positioning bosses respectively correspond to the positions of the plurality of first limiting grooves and can be snap-fitted therewith.

[0017] It is further defined that, in the above-mentioned plastic pneumatic diaphragm valve, the first limiting groove is in an "L" shape, having a first section extending along the axial direction of the embedded part and a second section extending along the circumferential direction of the embedded part;

[0018] Wherein, the angular range in which the first positioning boss can rotate in the second section of the first limiting groove is set to 30° to 90°.

[0019] It is further defined that, in the above-mentioned plastic pneumatic diaphragm valve, the first limiting groove is in a "T" shape, having a first section extending along the axial direction of the embedded part, and a second section and a third section extending along both sides of the circumference of the embedded part and symmetrical with respect to the first section;

[0020] Wherein, taking the first section of the first limiting groove as a reference, the angular ranges in which the first positioning boss can rotate in the second section and the third section of the first limiting groove are respectively set to ±30° to 90°.

[0021] It is further defined that, in the above-mentioned plastic pneumatic diaphragm valve, the second clamping assembly includes a second positioning boss and a second limiting groove capable of being engaged with the second positioning boss;

[0022] Wherein, the second positioning boss is fixedly arranged at one end of the indicator close to the valve body and protrudes radially along the indicator, and the second limiting groove is arranged at one end of the piston close to the indicator;

[0023] Or the second positioning boss is fixedly arranged at one end of the piston close to the indicator and protrudes radially along the piston, and the second limiting groove is arranged at one end of the indicator close to the valve body.

[0024] It is further defined that, in the above-mentioned plastic pneumatic diaphragm valve, a plurality of the second positioning bosses and a plurality of the second limiting grooves are provided, and the plurality of the second positioning bosses and the second limiting grooves are arranged in a ring array about the central axis of the piston;

[0025] Wherein, the plurality of second positioning bosses respectively correspond to the positions of the plurality of second limiting grooves and can be snap-fitted therewith.

[0026] It is further defined that, in the above-mentioned plastic pneumatic diaphragm valve, the second limit groove is in an "L" shape, having a first section extending along the axial direction of the piston and a second section extending along the circumferential direction of the piston;

[0027] Wherein, the angular range in which the second positioning boss can rotate in the second section of the second limiting groove is set to 30° to 90°.

[0028] It is further defined that, in the above-mentioned plastic pneumatic diaphragm valve, the second limit groove is in a "T" shape, having a first section extending along the axial direction of the piston, and a second section and a third section extending along both sides of the circumference of the piston and symmetrical with respect to the first section;

[0029] Wherein, taking the first section of the second limiting groove as a reference, the angle ranges in which the second positioning boss can rotate in the second section and the third section of the second limiting groove are respectively set to ±30° to 90°.

[0030] It is further defined that, in the above-mentioned plastic pneumatic diaphragm valve, the first section of the second limiting groove is provided with an inclined guide section;

[0031] The groove cross section of the inclined guide section is conical, and the larger opening end faces the second positioning boss.

[0032] It is further defined that in the above-mentioned plastic pneumatic diaphragm valve, the piston is spline-connected between one end close to the valve body and the lower shell.

[0033] Further defined, in the above-mentioned plastic pneumatic diaphragm valve, a limiting convex piece is fixedly provided on the outer circumferential surface of the piston close to one end of the valve body, and a locking groove slidably connected to the limiting convex piece is provided on the groove wall of the pressure chamber;

[0034] Or a locking groove is fixedly provided on the outer circumferential surface of the piston close to one end of the valve body, and a limiting convex piece slidably connected to the locking groove is provided on the groove wall of the pressure chamber.

[0035] It is further defined that in the above-mentioned plastic pneumatic diaphragm valve, there are a plurality of the position-limiting protrusions and the locking grooves, respectively, and the plurality of the position-limiting protrusions and the locking grooves are arranged in a ring array about the central axis of the piston;

[0036] Wherein, the plurality of position-limiting protrusions respectively correspond to the positions of the plurality of locking grooves and can slide and cooperate along the central axis of the piston.

[0037] The utility model has at least the following beneficial effects:

[0038] 1. The upper cover and the lower shell are connected by a snap-fit ​​connection, which is convenient for the overall assembly of the device. At the same time, it can overcome the spring force on the piston when the two are installed and unloaded, avoiding the risk of the upper cover popping open. When the flow channel of the valve body is opened and closed, the indicator can adjust its relative position with the upper cover as the piston moves. The working condition of the diaphragm can be judged by observing the length of the indicator extending from the upper cover, which is convenient for operators to control the opening and closing state of the valve body more accurately and intuitively.

[0039] 2. The upper cover, lower shell, indicator and piston are respectively provided with a rotating buckle structure, and the axial limit can be achieved by relative rotation during assembly, which not only improves the overall installation efficiency, but also ensures the safety during disassembly;

[0040] 3. The inclined guide section provided in the first section of the second limiting groove can be used to guide the insertion of the second positioning boss, thereby improving the efficiency of the clamping fit between the indicator and the piston;

[0041] 4. The spline connection between the piston and the lower shell allows the two to move relative to each other only in the axial direction, and limits the circumferential rotation of the piston relative to the lower shell, thereby preventing the piston and the indicator from rotating relative to each other and causing the connection to fail. At the same time, it can prevent the threaded connection between the diaphragm and the piston from loosening, thereby ensuring the reliability of the connection between the piston and the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a normally closed diaphragm valve in the prior art;

[0043] Figure 2 This is a schematic diagram of the structure of a plastic pneumatic diaphragm valve according to an embodiment of the present application;

[0044] Figure 3 This is a schematic diagram of the structure explosion of the plastic pneumatic diaphragm valve according to an embodiment of the present application;

[0045] Figure 4 This is a schematic diagram of the structure explosion of the plastic pneumatic diaphragm valve according to an embodiment of the present application;

[0046] Figure 5 This is a structural cross-sectional view of the plastic pneumatic diaphragm valve in the "closed state" according to an embodiment of the present application;

[0047] Figure 6 This is a structural cross-sectional view of the plastic pneumatic diaphragm valve in the "open state" according to an embodiment of the present application;

[0048] Figure 7 This is a schematic diagram of the installation of the "upper cover 100 and lower shell 200" in the plastic pneumatic diaphragm valve of the embodiment of the present application;

[0049] Figure 8 This is a schematic diagram of the installation of the "upper cover 100 and lower shell 200" in the plastic pneumatic diaphragm valve of the embodiment of the present application;

[0050] Fig. 9 This is a schematic diagram of the installation of the "indicator 500 and piston 610" in the plastic pneumatic diaphragm valve of the embodiment of the present application;

[0051] Fig.10 It is a schematic diagram of the coordination of the "piston 610 and the lower shell 200" in the plastic pneumatic diaphragm valve according to the embodiment of the present application.

[0052] Reference numerals

[0053] Upper cover 100, first pressure inlet 110, indication hole 120, first positioning boss 130, lower shell 200, second pressure inlet 210, pressure chamber 220, piston chamber 221, sliding hole 222, locking groove 223, embedded part 230, first limiting groove 240, valve body 300, flow channel 310, fluid inlet hole 311, fluid outlet hole 312, accommodating chamber 320, base 400, indicator 500, second positioning boss 510, piston 610, second limiting groove 611, limiting convex part 612, diaphragm part 620, spring 700. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0055] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0056] The plastic pneumatic diaphragm valve provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0057] like Figures 2 to 10 As shown, an embodiment of the present application provides a plastic pneumatic diaphragm valve, including an upper cover 100, a lower shell 200, and a valve body 300. The lower shell 200 is fixedly arranged on the valve body 300 and fixedly connected to the upper cover 100 via a first clamping assembly. A flow channel 310 is provided through the valve body 300, and an accommodating cavity 320 connected to the flow channel 310 is provided on the end surface close to the lower shell 200.

[0058] A pressure chamber 220 is provided in the lower shell 200, and a piston 610 and a spring 700 capable of providing elastic force for the piston 610 are provided in the pressure chamber 220. A diaphragm member 620 located in the accommodating chamber 320 is fixedly provided at one end of the piston 610 close to the valve body 300 and an indicator 500 is fixedly provided at one end away from the valve body 300. The indicator 500 extends to the outside of the upper cover 100 at one end away from the valve body 300.

[0059] Among them, the upper cover 100 is provided with a first pressure inlet 110 that can be connected to the pressure chamber 220. When the pressure chamber 220 is pressurized through the first pressure inlet 110, the piston 610 can be driven to slide toward the side close to the valve body 300, thereby pushing the diaphragm 620 to block the flow channel 310; the lower shell 200 is provided with a second pressure inlet 210 that is connected to the pressure chamber 220. When the pressure chamber 220 is pressurized through the second pressure inlet 210, the piston 610 can be driven to slide toward the side away from the valve body 300, thereby pulling the diaphragm 620 to open the flow channel 310.

[0060] Specifically, the piston 610 includes a shaft portion and a piston portion fixedly disposed on the shaft portion and slidably connected to the pressure chamber 220. The first pressure inlet 110 and the second pressure inlet 210 are respectively located on both sides of the axial direction of the piston portion. Figure 5 As shown, when the pressure chamber 220 is pressurized through the first pressure inlet 110, the piston portion of the piston 610 close to the first pressure inlet 110 is pushed downward, thereby driving the diaphragm 620 to block the flow channel 310, and the fluid cannot flow in the flow channel 310; Figure 6 As shown, when pressure is applied to the pressure chamber 220 through the second pressure inlet 210 , the piston portion of the piston 610 close to the second pressure inlet 210 is pushed upward, thereby driving the diaphragm 620 to open the flow channel 310 , and the fluid can flow in the flow channel 310 .

[0061] In the embodiment of the present application, the above-mentioned plastic pneumatic diaphragm valve is adopted, and a snap-fit ​​connection method is adopted between the upper cover 100 and the lower shell 200. On the one hand, it is convenient for the overall assembly of the device. At the same time, when the two are loaded and unloaded, it can overcome the elastic force of the spring 700 on the piston 610, and avoid the risk of the upper cover 100 popping open. When the flow channel 310 of the valve body 300 is opened and closed, the indicator 500 can adjust its relative position with the upper cover 100 as the piston 610 moves. The working condition of the diaphragm 620 can be judged by observing the length of the indicator 500 extending out of the upper cover 100, which is convenient for the operator to control the opening and closing state of the valve body 300 more accurately and intuitively.

[0062] It is understandable that the plastic pneumatic diaphragm valve can be set as a normally closed valve or a normally open valve. When set as a normally closed valve, the spring 700 is located between the upper cover 100 and the piston 610. When neither the first pressure inlet 110 nor the second pressure inlet 210 applies pressure to the pressure chamber 220, the piston 610 pushes the diaphragm 620 to block the flow channel 310 under the elastic force of the spring 700. At this time, applying pressure to the pressure chamber 220 through the second pressure inlet 210 can overcome the elastic force on the piston 610 and move it away from the valve body 300, thereby releasing the blockage of the flow channel 310. In this setting, the first pressure inlet 110 can be used as an emergency or adjustment channel or directly omitted. When set as a normally closed valve, the spring 700 is located between the upper cover 100 and the piston 610. When the first pressure inlet 110 is used as an emergency or adjustment channel, the piston 610 can be used as an emergency or adjustment channel or directly omitted. When the valve is normally open, the spring 700 is located between the piston 610 and the lower shell 200. When neither the first pressure inlet 110 nor the second pressure inlet 210 applies pressure to the pressure chamber 220, the piston 610 pulls the diaphragm 620 under the action of the elastic force of the spring 700. At this time, the flow channel 310 is in an open state. Applying pressure to the pressure chamber 220 through the first pressure inlet 110 can overcome the elastic force on the piston 610 and move it toward the side close to the valve body 300, thereby pushing the diaphragm 620 to block the flow channel 310. Under this setting, the second pressure inlet 210 can be used as an emergency or adjustment channel or be directly omitted.

[0063] It is understandable that the pressure chamber can also be set in the upper cover 100, that is, the piston 610 is set in the pressure chamber in the upper cover 100, or the pressure chamber is set between the upper cover 100 and the lower shell 200. As long as the piston 610 and the diaphragm 620 can be driven by the pressurization of the first pressure inlet 110 and the second pressure inlet 210 to control the opening and closing of the flow channel 310, it will not be elaborated here.

[0064] In a preferred embodiment, Figure 5 , Figure 6 As shown, the flow channel 310 includes a fluid inlet hole 311 and a fluid outlet hole 312 , the first ends of the fluid inlet hole 311 and the fluid outlet hole 312 are respectively connected to the outer end surface of the valve body 300 , and the second ends are respectively connected to the accommodating cavity 320 .

[0065] It can be understood that when the diaphragm 620 is in a closed state, the second end of the fluid inlet hole 311 and / or the fluid outlet hole 312 is blocked by the diaphragm 620, and the fluid cannot flow in the flow channel 310; when the diaphragm 620 is in an open state, the second ends of the fluid inlet hole 311 and the fluid outlet hole 312 are not blocked by the diaphragm 620, and the fluid flowing in from the first end of the fluid inlet hole 311 can pass through the flow accommodating cavity 320 and flow out from the first end of the fluid outlet hole 312.

[0066] In a preferred embodiment, Figures 2 to 8As shown, an indication hole 120 is formed through the end surface of the upper cover 100 away from the lower shell 200 , and the indicator 500 is slidably disposed in the indication hole 120 .

[0067] It is understandable that when the piston 610 adjusts its position in the pressure chamber 220 , it can drive the indicator 500 to move synchronously, thereby changing the length of the indicator 500 extending from the indicator hole 120 . The staff can determine the open or closed state of the valve body 300 by the extension state of the indicator 500 .

[0068] In a preferred embodiment, Figures 3 to 8 As shown, the spring 700 is disposed between the piston 610 and the upper cover 100 .

[0069] Specifically, one end of the spring 700 abuts against the end surface of the piston 610 away from the valve body 300 , and the other end abuts against the end of the upper cover 100 close to the lower shell 200 .

[0070] It can be understood that when the plastic pneumatic diaphragm valve is set as a normally closed valve, the spring 700 is located between the upper cover 100 and the piston 610, the diaphragm 620 blocks the flow channel 310, the spring 700 is not compressed or has an elastic force to drive the piston 610 to move toward the side close to the valve body 300; when the plastic pneumatic diaphragm valve is set as a normally open valve, the spring 700 is located between the lower shell 200 and the piston 610, the diaphragm 620 does not block the flow channel 310, the spring 700 is not compressed or has an elastic force to drive the piston 610 to move away from the valve body 300.

[0071] In a preferred embodiment, Figures 3 to 8 As shown, the first snap-fit ​​assembly includes a first positioning boss 130 fixedly arranged on one end of the upper cover 100 close to the lower shell 200, and the lower shell 200 has an embedding portion 230 embedded with the upper cover 100 at one end close to the upper cover 100, and a first limiting groove 240 that can cooperate and snap-fit ​​with the first positioning boss 130 is provided on the outer circumferential surface of the embedding portion 230.

[0072] The first limiting groove 240 is “L”-shaped, and has a first section extending along the axial direction of the embedding portion 230 and a second section extending along the circumferential direction of the embedding portion 230 .

[0073] It can be understood that when the upper cover 100 and the lower shell 200 are assembled, the indicator 500 is inserted into the indicating hole 120 of the upper cover 100 after the piston 610 is connected, and the first positioning boss 130 on the upper cover 100 is located at the corresponding position of the first section of the first limiting groove 240 on the lower shell 200. At this time, the upper cover 100 is pressed toward one side of the lower shell 200, and the embedding portion 230 is embedded in the upper cover 100. The first positioning boss 130 slides along the first section of the first limiting groove 240 to the second section of the first limiting groove 240, and then the upper cover 100 is rotated to make the first positioning boss 130 slide along the second section of the first limiting groove 240 until it contacts the end point of the second section of the first limiting groove 240. At this time, the axial limitation between the upper cover 100 and the lower shell 200 can be achieved through the interference of the groove wall of the second section of the first limiting groove 240 with the first positioning boss 130.

[0074] In the embodiment of the present application, the above-mentioned plastic pneumatic diaphragm valve is adopted, and a rotating buckle structure is adopted between the upper cover 100 and the lower shell 200. When the two are assembled, axial limitation can be achieved through relative rotation, which not only improves the overall installation efficiency but also ensures safety during disassembly.

[0075] It is understandable that the arrangement of the first clamping assembly is not limited to the above-mentioned one. For example, the first limiting groove 240 can be arranged at the inner wall of the bottom embedding cavity of the upper cover 100, and the first positioning boss 130 is arranged at the corresponding position of the embedding portion 230. At this time, when the embedding portion 230 is embedded with the upper cover 100, the first positioning boss 130 and the first limiting groove 240 can also be realized. At the same time, the embedding form of the upper cover 100 and the lower shell 200 is not limited to the above-mentioned one. For example, an embedding portion can be arranged at the bottom of the upper cover 100, and an embedding cavity that is embedded with the embedding portion of the upper cover 100 can be arranged on the lower shell 200. The first limiting groove 240 and the first positioning boss 130 are correspondingly arranged at the embedding portion of the upper cover 100 and the embedding cavity of the lower shell 200, which can also achieve the effect of rotational clamping and limiting. It will not be repeated here.

[0076] In a preferred embodiment, Figures 3 to 8 As shown, at least one first positioning boss 130 is disposed on the bottom of the upper cover 100 , and at least one first limiting groove 240 is disposed on the outer circumferential surface of the embedding portion 230 at a position corresponding to the first positioning boss 130 .

[0077] It can be understood that when a plurality of first positioning bosses 130 and a plurality of first limiting grooves 240 are provided correspondingly, the axial limiting strength and stability between the upper cover 100 and the lower shell 200 can be improved.

[0078] In a preferred embodiment, Figures 3 to 8As shown, a plurality of first positioning bosses 130 are arranged in a circular array along the central axis of the upper cover 100 at the bottom of the upper cover 100, and a plurality of first limiting grooves 240 are arranged in a circular array on the outer circumferential surface of the embedding portion 230 about the central axis of the embedding portion 230 corresponding to the positions of the first positioning bosses 130.

[0079] It is understandable that, by distributing the plurality of first positioning bosses 130 and the first limiting grooves 240 in an annular array, the uniformity of the distribution of the axial limiting force of the upper cover 100 and the lower shell 200 can be improved, thereby improving the connection reliability between the two.

[0080] In a preferred embodiment, Figures 3 to 8 As shown, the angular range in which the first positioning boss 130 can rotate in the second section of the first limiting groove 240 is set to 30° to 90°.

[0081] It can be understood that, through the above-mentioned relative rotation angle setting, on the one hand, it is possible to ensure the matching stability between the first positioning boss 130 and the first limiting groove 240, avoiding shaking and disengagement caused by too small a relative rotation angle, and on the other hand, it is convenient for the distribution of multiple first positioning bosses 130, thereby improving the connection stability of the upper cover 100 and the lower shell 200.

[0082] In a preferred embodiment, the angle at which the first positioning boss 130 can rotate in the second section of the first limiting groove 240 is preferably set to 45°.

[0083] In a preferred embodiment, the first limiting groove 240 can also be configured to be "T"-shaped, having a first section extending axially along the embedded portion 230, and a second section and a third section extending along both sides of the embedded portion 230 and symmetrical about the first section.

[0084] It is understandable that when the first limiting groove 240 is set to the above structure, the upper cover 100 and the lower shell 200 can rotate relative to each other in clockwise and counterclockwise directions when assembled. At this time, the first positioning boss 130 and the first limiting groove 240 can cooperate to achieve an axial limiting effect.

[0085] It can be understood that when the first limiting groove 240 is set to the above structure, with the first section of the first limiting groove 240 close to one side end of the valve body 300 as a reference, the angle range in which the first positioning boss 130 can rotate in the second and third sections of the first limiting groove 240 is set to ±30° to 90° respectively.

[0086] In a preferred embodiment, Figures 2 to 8 As shown, the upper cover 100 and the lower shell 200 are fastened together by bolts through the first fastening assembly.

[0087] It is understandable that when the upper cover 100 and the lower shell 200 are connected by a rotating buckle structure, in order to avoid connection failure due to shaking during operation, they are further fastened by bolts on this basis to ensure the stability of the connection between the two.

[0088] In a preferred embodiment, Figures 3 to 6 , Fig. 9 , Fig.10 As shown, the indicator 500 and the piston 610 are connected via a second clamping assembly.

[0089] In a preferred embodiment, Figures 3 to 6 , Fig. 9 , Fig.10 As shown, the second clamping assembly includes a second positioning boss 510 fixedly arranged at one end of the indicator 500 close to the valve body 300 and protruding radially along the indicator 500, and a second limiting groove 611 that cooperates and clamps with the second positioning boss 510 is provided at one end of the piston 610 close to the indicator 500.

[0090] The second limiting groove 611 is “L”-shaped, having a first section extending along the axial direction of the piston 610 and a second section extending along the circumferential direction of the piston 610 .

[0091] It can be understood that when the indicator 500 is assembled with the piston 610, the second positioning boss 510 on the indicator 500 is located at the corresponding position of the first section of the second limiting groove 611 on the piston 610. At this time, the indicator 500 is pressed toward one side of the piston 610, and the indicator 500 is embedded in the first section of the second limiting groove 611. The second positioning boss 510 slides along the first section of the second limiting groove 611 to the second section of the second limiting groove 611, and then the indicator 500 is rotated to make the second positioning boss 510 slide along the second section of the second limiting groove 611 until it contacts the end point of the second section of the second limiting groove 611. At this time, the axial limitation between the indicator 500 and the piston 610 can be achieved through the interference of the second section of the groove wall of the second limiting groove 611 with the second positioning boss 510.

[0092] In the embodiment of the present application, the above-mentioned plastic pneumatic diaphragm valve is used, and a rotating buckle structure is used between the indicator 500 and the piston 610. When the two are assembled, axial limiting can be achieved through relative rotation, further improving the overall assembly efficiency of the device.

[0093] It is understandable that the setting form of the second snap-fit ​​assembly is not limited to the above-mentioned one. For example, a second limiting groove 611 can be set at the end of the second positioning boss 510 close to the piston 610, and a second positioning boss 510 cooperating with the second limiting groove 611 can be set at the end of the piston 610 close to the indicator 500. As long as the rotational snap-fit ​​cooperation between the indicator 500 and the piston 610 can be achieved, it will not be elaborated here.

[0094] In a preferred embodiment, Figures 3 to 6 , Fig. 9 , Fig.10 As shown, a plurality of second positioning bosses 510 are provided on the indicator 500 in a circular array about the central axis of the indicator 500 , and a plurality of second limiting grooves 611 are provided on the piston 610 corresponding to the plurality of second positioning bosses 510 .

[0095] It can be understood that the connection reliability between the indicator 500 and the piston 610 can be further improved through the cooperation between the multiple sets of second limiting grooves 611 and the second positioning bosses 510.

[0096] In a preferred embodiment, Fig. 9 As shown, the angular range θ of the second positioning boss 510 that can rotate in the second section of the second limiting groove 611 is set to 30° to 90°.

[0097] In a preferred embodiment, the angle θ at which the second positioning boss 510 can rotate in the second section of the second limiting groove 611 is preferably set to 45°.

[0098] In a preferred embodiment, the second limiting groove 611 can also be configured to be "T"-shaped, having a first section extending axially along the piston 610, and a second section and a third section extending along both sides of the piston 610 and symmetrical about the first section.

[0099] It is understandable that when the second limiting groove 611 is set to the above structure, the indicator 500 and the piston 610 can rotate relative to each other in both clockwise and counterclockwise directions when assembled. At this time, the cooperation between the second positioning boss 510 and the second limiting groove 611 can achieve an axial limiting effect.

[0100] It can be understood that when the second limiting groove 611 is set to the above structure, with the first section of the second limiting groove 611 close to one side end of the valve body 300 as a reference, the angle range in which the second positioning boss 510 can rotate in the second and third sections of the second limiting groove 611 is set to ±30°~90° respectively.

[0101] In a preferred embodiment, Fig. 9 As shown, the first section of the second limiting groove 611 is provided with an inclined guide section, the groove cross section of the inclined guide section is conical, and the larger opening end faces the indicator 500 side.

[0102] It can be understood that, through the inclined guide section provided in the first section of the second limiting groove 611 , the second positioning boss 510 can be inserted and guided, thereby improving the efficiency of the snap-fitting between the indicator 500 and the piston 610 .

[0103] In a preferred embodiment, Figures 3 to 6 As shown in FIG. 10 , the diaphragm 620 is threadedly connected to one end of the piston 610 close to the valve body 300 .

[0104] In a preferred embodiment, Figures 3 to 6 As shown in FIG. 10 , one end of the piston 610 close to the valve body 300 is spline-connected to the lower shell 200 .

[0105] In the embodiment of the present application, the above-mentioned plastic pneumatic diaphragm valve is used, and the piston 610 and the lower shell 200 are splined to each other so that the two can only move relative to each other in the axial direction, and the circumferential rotation of the piston 610 relative to the lower shell 200 is restricted to avoid relative rotation of the piston 610 and the indicator 500 resulting in failure of the card connection. At the same time, loosening of the thread between the diaphragm part 620 and the piston 610 can be avoided, thereby ensuring the reliability of the connection between the piston 610 and the diaphragm part 620.

[0106] In a preferred embodiment, Figures 3 to 6 As shown in 10 , a limiting protrusion 612 is fixedly provided on the outer circumferential surface of the piston 610 close to one end of the valve body 300 , and a locking groove 223 slidably connected to the limiting protrusion 612 is provided on the groove wall of the pressure chamber 220 .

[0107] When the piston 610 moves in the pressure chamber 220 to control the opening and closing of the valve body 300, the limiting protrusion 612 slides axially along the piston 610 in the locking groove 223, and the locking groove 223 can resist the limiting protrusion 612 to achieve relative rotation limitation between the piston 610 and the lower shell 200.

[0108] It is understandable that the cooperation form between the piston 610 and the pressure chamber 220 is not limited to the above-mentioned one. For example, the locking groove 223 can be set on the outer circumferential surface of the piston 610 close to the valve body 300, and the limiting protrusion 612 can be set on the groove wall of the pressure chamber 220. At this time, the relative rotation limit between the piston 610 and the lower shell 200 can also be achieved through the sliding cooperation between the locking groove 223 and the limiting protrusion 612, which is not elaborated here.

[0109] In a preferred embodiment, Figures 3 to 6 As shown in FIG. 10 , the pressure chamber 220 includes a piston chamber 221 slidably connected to the piston portion of the piston 610 and a sliding hole 222 slidably connected to the shaft portion of the piston 610 . The shaft portion of the piston 610 passes through the sliding hole 222 and is threadedly connected to the diaphragm member 620 .

[0110] The limiting protrusion 612 is fixedly disposed on the outer circumferential surface of the shaft portion of the piston 610 , and the locking groove 223 is disposed on the inner wall of the sliding hole 222 .

[0111] In a preferred embodiment, Figures 3 to 6 As shown in FIG. 10 , a plurality of limiting protrusions 612 are provided on the piston 610 in a circular array about the axis of the piston 610 , and a plurality of locking grooves 223 are provided on the inner wall of the pressure chamber 220 corresponding to the plurality of limiting protrusions 612 .

[0112] It can be understood that the circumferential limiting between multiple sets of limiting protrusions 612 and locking grooves 223 can further improve the matching stability between the piston 610 and the lower shell 200.

[0113] In a preferred embodiment, the projection pattern of the limiting protrusion 612 on the axial vertical plane of the piston 610 can be set to a quadrilateral, a pentagon or a semicircle, etc., as long as it can achieve sliding engagement with the locking groove 223 and limit the relative rotation between the piston 610 and the lower shell 200, which will not be elaborated here.

[0114] In a preferred embodiment, Figures 2 to 6 As shown, it also includes a base 400 fixedly arranged on the end surface of the valve body 300 away from the lower shell 200.

[0115] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0116] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A plastic pneumatic diaphragm valve, characterized in that: It includes an upper cover, a lower shell, a valve body, a spring, a piston, a sealing ring, a diaphragm, and an indicator, wherein the lower shell is fixedly arranged on the valve body and is fixedly connected to the upper cover through a first clamping assembly; A flow channel is provided through the valve body, a pressure chamber is provided in the upper cover and / or the lower shell, and the spring and the piston are arranged in the pressure chamber; The diaphragm is connected to the end of the piston close to the valve body through a thread and can block or open the flow channel with the movement of the piston. The indicator is fixed to the end of the piston away from the valve body through a second clamping assembly and extends away from the end of the valve body to the outside of the upper cover. Wherein, a first pressure inlet which is in communication with the outside and capable of pressurizing the pressure chamber is provided on the inner wall of the pressure chamber of the upper cover, and the piston has a movement tendency to move toward a side close to the valve body when the first pressure inlet is pressurized; And / or a second pressure inlet connected to the outside and capable of pressurizing the pressure chamber is provided on the inner wall of the pressure chamber of the lower shell, and the piston has a tendency to move away from the valve body when the second pressure inlet is pressurized.

2. A plastic pneumatic diaphragm valve according to claim 1, characterized in that: The first clamping assembly includes an embedding portion coaxial with the piston and an embedding cavity embedded with the embedding portion, wherein the embedding portion is fixedly arranged at one of the two opposite ends between the upper cover and the lower shell, and the embedding cavity is arranged at the other end of the two opposite ends between the upper cover and the lower shell; Wherein, a first positioning boss is fixedly provided on the inner wall of the embedding cavity, and a first limiting groove capable of cooperating and engaging with the first positioning boss is provided on the outer circumferential surface of the embedding portion; Or a first limiting groove is fixedly provided on the inner wall of the embedding cavity, and a first positioning boss which can be engaged with the first positioning boss is provided on the outer circumferential surface of the embedding portion.

3. A plastic pneumatic diaphragm valve according to claim 2, characterized in that: There are a plurality of first positioning bosses and a plurality of first limiting grooves, and the plurality of first positioning bosses and first limiting grooves are arranged in a ring array about the central axis of the embedding portion; Wherein, the plurality of first positioning bosses respectively correspond to the positions of the plurality of first limiting grooves and can be snap-fitted therewith.

4. A plastic pneumatic diaphragm valve according to claim 2 or 3, characterized in that: The first limiting groove is in an "L" shape, having a first section extending along the axial direction of the embedding portion and a second section extending along the circumferential direction of the embedding portion; Wherein, the angular range in which the first positioning boss can rotate in the second section of the first limiting groove is set to 30° to 90°.

5. A plastic pneumatic diaphragm valve according to claim 2 or 3, characterized in that: The first limiting groove is in a "T" shape, and has a first section extending along the axial direction of the embedded part, and a second section and a third section extending along both sides of the circumference of the embedded part and symmetrical with respect to the first section; Wherein, taking the first section of the first limiting groove as a reference, the angular ranges in which the first positioning boss can rotate in the second section and the third section of the first limiting groove are respectively set to ±30° to 90°.

6. A plastic pneumatic diaphragm valve according to claim 1, characterized in that: The second clamping assembly includes a second positioning boss and a second limiting groove capable of being engaged with the second positioning boss; Wherein, the second positioning boss is fixedly arranged at one end of the indicator close to the valve body and protrudes radially along the indicator, and the second limiting groove is arranged at one end of the piston close to the indicator; Or the second positioning boss is fixedly arranged at one end of the piston close to the indicator and protrudes radially along the piston, and the second limiting groove is arranged at one end of the indicator close to the valve body.

7. A plastic pneumatic diaphragm valve according to claim 6, characterized in that: There are a plurality of second positioning bosses and a plurality of second limiting grooves, respectively, and the plurality of second positioning bosses and second limiting grooves are arranged in a ring array about the central axis of the piston; Wherein, the plurality of second positioning bosses respectively correspond to the positions of the plurality of second limiting grooves and can be snap-fitted therewith.

8. A plastic pneumatic diaphragm valve according to claim 6, characterized in that: The second limiting groove is "L"-shaped, having a first section extending along the axial direction of the piston and a second section extending along the circumferential direction of the piston; Wherein, the angular range in which the second positioning boss can rotate in the second section of the second limiting groove is set to 30° to 90°.

9. A plastic pneumatic diaphragm valve according to claim 6, characterized in that: The second limiting groove is in a "T" shape, having a first section extending along the axial direction of the piston, and a second section and a third section extending along both sides of the circumference of the piston and symmetrical with respect to the first section; Wherein, taking the first section of the second limiting groove as a reference, the angle ranges in which the second positioning boss can rotate in the second section and the third section of the second limiting groove are respectively set to ±30° to 90°.

10. A plastic pneumatic diaphragm valve according to claim 8 or 9, characterized in that: The first section of the second limiting groove is provided with an inclined guide section; The groove cross section of the inclined guide section is conical, and the larger opening end faces the second positioning boss.

11. A plastic pneumatic diaphragm valve according to claim 1, characterized in that: The piston is spline-connected with the lower shell at one end close to the valve body.

12. A plastic pneumatic diaphragm valve according to claim 1 or 11, characterized in that: A limiting convex piece is fixedly provided on the outer circumferential surface of the piston close to one end of the valve body, and a locking groove slidably connected to the limiting convex piece is provided on the groove wall of the pressure chamber; Or a locking groove is fixedly provided on the outer circumferential surface of the piston close to one end of the valve body, and a limiting convex piece slidably connected to the locking groove is provided on the groove wall of the pressure chamber.

13. A plastic pneumatic diaphragm valve according to claim 12, characterized in that: There are a plurality of the position-limiting protrusions and locking grooves, respectively, and the plurality of the position-limiting protrusions and locking grooves are arranged in a ring array about the central axis of the piston; Wherein, the plurality of position-limiting protrusions respectively correspond to the positions of the plurality of locking grooves and can slide and cooperate along the central axis of the piston.

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