Double-diaphragm enhanced sealing type diaphragm valve

Abstract

The utility model relates to the technical field of valves, in particular to a double-diaphragm reinforced sealing type diaphragm valve, which comprises a valve body, a valve cover, a valve rod, a valve clack, a valve seat, a diaphragm piece and an actuating mechanism, the diaphragm piece comprises a first diaphragm and a second diaphragm, and the valve cover is connected with the valve body through a connecting piece. The connecting piece further penetrates through the first diaphragm to be connected with the valve body, the edge of the second diaphragm abuts against the side wall of the connecting piece, a flange is further arranged on the edge of the second diaphragm in a protruding mode, and an annular groove matched with the flange is concavely formed in the valve deck. And the part, not in contact with the valve clack, of the diaphragm is integrally deformed along with the diaphragm, so that the diaphragm and the valve seat are in closer sealing fit.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a double diaphragm enhanced sealing diaphragm valve. Background Technology

[0002] A diaphragm valve is a shut-off valve that uses a diaphragm as the opening and closing element to close the flow channel, cut off the fluid, and separate the valve body cavity from the valve cover cavity. The diaphragm is usually made of elastic, corrosion-resistant, and non-permeable materials such as rubber and plastic. The valve body is mostly made of plastic, fiberglass, ceramic, or metal lined with rubber. It has a simple structure, good sealing and corrosion resistance, and low fluid resistance. It is used for low-pressure, low-temperature, highly corrosive media and media containing suspended substances.

[0003] However, existing diaphragm valves have poor sealing performance. When the valve disc is closed, the diaphragm and the valve seat cannot form an effective sealing fit. Especially during the valve disc closing process, the part of the diaphragm that is not in contact with the valve disc arches up, causing the diaphragm to not fully deform into place, resulting in leakage gaps between the diaphragm and the valve seat.

[0004] The purpose of this invention is to propose corresponding solutions to the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a double-diaphragm enhanced sealing diaphragm valve. This invention improves the sealing performance by setting a double-diaphragm structure. The double diaphragm has a stronger deformation capacity, and the part of the diaphragm that is not in contact with the valve disc will also deform along with the whole diaphragm, thereby making the diaphragm and the valve seat form a tighter sealing fit.

[0006] The technical solution adopted by this utility model is as follows: a double diaphragm enhanced sealing diaphragm valve, including a valve body, a valve cover, a valve stem, a valve disc, a valve seat, a diaphragm, and an actuator. The valve cover is disposed at one end of the valve body. The edge of the diaphragm is sandwiched between the valve cover and the valve body, and the diaphragm is connected to the valve disc by fasteners. The valve seat is disposed in the valve body for sealing cooperation with the diaphragm. The actuator drives the valve stem and the valve disc to reciprocate. The diaphragm includes a first diaphragm and a second diaphragm. The valve cover is connected to the valve body by a connector. The connector also passes through the first diaphragm and is connected to the valve body. The edge of the second diaphragm abuts against the side wall of the connector, and the edge of the second diaphragm also has a protruding flange. The valve cover has a recessed annular groove that matches the flange.

[0007] The valve body is provided with a locking member for connecting the connector. The connector includes a first threaded section, a smooth rod section and a second threaded section arranged in sequence. When the valve cover is fixedly installed on the valve body, the first threaded section is threadedly connected to the valve cover, the smooth rod section passes through the edge of the first diaphragm, and the edge of the second diaphragm abuts against the side wall of the smooth rod section. The second threaded section is threadedly connected to the locking member.

[0008] The valve seat is also provided with a U-shaped diaphragm, both ends of which are connected to the valve seat by an interference fit, and a buffer cavity is formed between the middle of the U-shaped diaphragm and the valve seat.

[0009] The second diaphragm has a protruding abutment protrusion on the side near the valve disc. The valve disc is also provided with at least two sets of pressure film assemblies. The two sets of pressure film assemblies are evenly distributed around the abutment protrusion. The pressure film assembly includes a pressure plate and a rotating shaft. The pressure plate is rotatably mounted on the valve disc via the rotating shaft. When the valve disc is closed, the pressure plate presses down on the part of the second diaphragm corresponding to the abutment protrusion side.

[0010] The valve disc has a connecting groove for the abutment protrusion to extend into, and the rotating shaft is also located on the inner circumference of the connecting groove. The end face of the pressure plate near the second diaphragm is the contact surface, and the contact surface and the end face of the valve disc form a continuous arc surface.

[0011] The pressure film assembly also includes an elastic element. The valve disc has an installation groove for the elastic element to extend into. One end of the elastic element abuts against the inner wall of the installation groove, and the other end abuts against the end of the pressure plate away from the rotating shaft.

[0012] The inner wall of the mounting groove is also provided with a limiting rod for the outer sleeve of the elastic element. The end face of the pressure plate away from the rotating shaft is provided with a ring platform. The ring platform forms a limiting groove for the end of the elastic element to extend into. When the pressure plate rotates to fit with the valve disc, the ring platform extends into the mounting groove.

[0013] The beneficial effects of this utility model are as follows: This utility model improves the sealing performance by setting a double diaphragm structure. The double diaphragm has a stronger deformation capacity. The part of the diaphragm that is not in contact with the valve disc will also deform along with the whole diaphragm. That is, the second diaphragm, which is thicker than the first diaphragm, has a stronger deformation capacity and structural strength. The second diaphragm deforms during the valve disc closing process, generating downward pressure to help the part of the first diaphragm that is not in contact with the valve disc to deform as well, so that the first diaphragm can have a larger contact area with the valve seat, thereby making the diaphragm and the valve seat form a tighter sealing fit.

[0014] Furthermore, the connector used to connect the valve cover and the valve body passes through the edge of the first diaphragm, further fixing the first diaphragm and preventing it from deforming and misaligning and failing to seal the flow channel. It also prevents the medium from leaking from the connection between the valve cover and the valve body. The second diaphragm is engaged with the annular groove of the valve cover through a flange, which helps prevent the second diaphragm from misaligning when it deforms. The edge of the second diaphragm abuts against the connector, increasing the stress points and also helping the second diaphragm deform. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0016] Figure 1 This is a schematic diagram of the structure of the double diaphragm enhanced sealing diaphragm valve of this utility model;

[0017] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0018] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;

[0019] Figure 4 This is a schematic diagram showing the contact between the pressure plate and the valve disc.

[0020] In the diagram, 1-valve body, 2-valve cover, 3-valve stem, 4-valve disc, 5-valve seat, 6-actuator, 7-fastener, 8-first diaphragm, 9-second diaphragm, 10-connector, 11-flange, 12-annular groove, 13-locking element, 14-first threaded section, 15-smooth rod section, 16-second threaded section, 17-U-shaped diaphragm, 18-buffer cavity, 19-abutting protrusion, 20-pressure plate, 21-rotating shaft, 22-connecting groove, 23-contact surface, 24-elastic element, 25-mounting groove, 26-limiting rod, 27-annular platform, 28-limiting groove. Detailed Implementation

[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0022] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0023] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0024] like Figures 1 to 4 As shown in the figure, this is an embodiment of the present invention, a double diaphragm enhanced sealing diaphragm valve, including a valve body 1, a valve cover 2, a valve stem 3, a valve disc 4, a valve seat 5, a diaphragm sheet, and an actuator 6. The valve cover 2 is disposed at one end of the valve body 1. The edge of the diaphragm sheet is sandwiched between the valve cover 2 and the valve body 1, and the diaphragm sheet is connected to the valve disc 4 by a fastener 7. The valve seat 5 is disposed in the valve body 1 for sealing cooperation with the diaphragm sheet. The actuator 6 drives the valve stem 3 and the valve disc 4 to reciprocate. The diaphragm sheet includes a first diaphragm 8 and a second diaphragm 9. The valve cover 2 is connected to the valve body 1 by a connector 10. The connector 10 also passes through the first diaphragm 8 and is connected to the valve body 1. The edge of the second diaphragm 9 abuts against the side wall of the connector 10, and the edge of the second diaphragm 9 also has a protruding flange 11. The valve cover 2 has a recessed annular groove 12 adapted to the flange 11.

[0025] The beneficial effects of this design are as follows: This utility model improves the sealing performance by setting a double diaphragm structure. The double diaphragm has a stronger deformation capacity. The part of the diaphragm that is not in contact with the valve disc will also deform along with the whole diaphragm. That is, the second diaphragm, which is thicker than the first diaphragm, has a stronger deformation capacity and structural strength. The second diaphragm deforms during the valve disc closing process, generating downward pressure to help the part of the first diaphragm that is not in contact with the valve disc to deform as well. This allows the first diaphragm to have a larger contact area with the valve seat, thereby making the diaphragm and the valve seat form a tighter sealing fit. The fasteners are screws of the existing technology.

[0026] Furthermore, the connector used to connect the valve cover and the valve body passes through the edge of the first diaphragm, further fixing the first diaphragm and preventing it from deforming and misaligning and failing to seal the flow channel. It also prevents the medium from leaking from the connection between the valve cover and the valve body. The second diaphragm is engaged with the annular groove of the valve cover through a flange, which helps prevent the second diaphragm from misaligning when it deforms. The edge of the second diaphragm abuts against the connector, increasing the stress points and also helping the second diaphragm deform.

[0027] Further, the valve body 1 is provided with a locking member 13 for connection of the connector 10. The connector 10 includes a first threaded section 14, a smooth rod section 15 and a second threaded section 16 arranged in sequence. When the valve cover 2 is fixedly installed on the valve body 1, the first threaded section 14 is threadedly connected to the valve cover 2, the smooth rod section 15 penetrates the edge of the first diaphragm 8 and the edge of the second diaphragm 9 abuts against the side wall of the smooth rod section 15, and the second threaded section 16 is threadedly connected to the locking member 13.

[0028] The beneficial effects of this design are as follows: the connecting parts use bolts from existing technology, the locking parts use nuts from existing technology, and both the first and second diaphragms are in contact with the smooth rod section of the connecting parts. The smooth rod section increases the contact area compared to the threaded section, which can provide greater support force. Furthermore, the smooth rod section is flatter and less likely to damage the diaphragms.

[0029] Furthermore, the valve seat 5 is also provided with a U-shaped diaphragm 17, both ends of which are connected to the valve seat 5 by an interference fit, and a buffer cavity 18 is formed between the middle part of the U-shaped diaphragm 17 and the valve seat 5.

[0030] The beneficial effects of this design are as follows: by increasing the contact area between the valve seat and the first diaphragm through the U-shaped diaphragm, an elastic seal is formed. When the first diaphragm deforms, it will also press down on the U-shaped diaphragm. The buffer cavity provides space for the deformation of the U-shaped diaphragm and can also prevent the valve disc from excessively impacting the valve seat when closing.

[0031] Further, the second diaphragm 9 has an abutting protrusion 19 on the side near the valve disc 4. The valve disc 4 is also provided with at least two sets of pressure film assemblies. The two sets of pressure film assemblies are evenly distributed around the abutting protrusion 19. The pressure film assembly includes a pressure plate 20 and a rotating shaft 21. The pressure plate 20 is rotatably mounted on the valve disc 4 through the rotating shaft 21. When the valve disc 4 is closed, the pressure plate 20 presses down on the part of the second diaphragm 9 corresponding to the abutting protrusion 19.

[0032] The beneficial effects of this design are as follows: a rotatable pressure plate on the valve disc further presses down on the second diaphragm, helping the second diaphragm deform when the valve disc is closed. The second diaphragm can generate a larger contact area with the U-shaped diaphragm, further increasing the sealing performance. The pressure plate can also rotate back to its original position, providing space for the second diaphragm to rebound.

[0033] Further, the valve disc 4 is provided with a connecting groove 22 for the abutment protrusion 19 to extend into, and the rotating shaft 21 is also provided on the inner circumference of the connecting groove 22. The end face of the pressure plate 20 near the second diaphragm 9 is the contact surface 23, and the contact surface 23 and the end face of the valve disc 4 form a continuous arc surface.

[0034] The beneficial effects of this design are as follows: the connecting groove allows for the installation of the abutment protrusion and the rotating shaft, resulting in a more compact structure, reduced deformation stroke, and extended diaphragm service life. The contact surface of the pressure plate can also fit against the valve disc to form an arc surface, preventing the edge of the pressure plate from scratching the second diaphragm.

[0035] In a further configuration, the pressure film assembly also includes an elastic element 24, and the valve disc 4 has an installation groove 25 into which the elastic element 24 extends. One end of the elastic element 24 abuts against the inner wall of the installation groove 25, and the other end abuts against the end of the pressure plate 20 away from the rotating shaft 21.

[0036] The beneficial effects of this design are as follows: the elastic element uses a spring from existing technology, and the spring force helps the pressure plate rotate.

[0037] Furthermore, the inner wall of the mounting groove 25 is provided with a limiting rod 26 for the outer sleeve of the elastic element 24, and an annular platform 27 is provided on the end face of the pressure plate 20 away from the rotating shaft 21. The annular platform 27 forms a limiting groove 28 for the end of the elastic element 24 to extend into. When the pressure plate 20 rotates to fit with the valve disc 4, the annular platform 27 extends into the mounting groove 25.

[0038] The beneficial effects of this design are as follows: the limiting rod and the limiting groove of the ring platform limit the two ends of the spring respectively, forming a bidirectional fixation, which prevents the spring from twisting and misaligning. The ring platform can also extend into the mounting groove to make room, preventing the pressure plate from failing to fit with the valve disc.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A double-diaphragm reinforced sealing diaphragm valve, comprising a valve body (1), a valve cover (2), a valve stem (3), a valve disc (4), a valve seat (5), a diaphragm, and an actuator (6), wherein the valve cover (2) is disposed at one end of the valve body (1), the edge of the diaphragm is sandwiched between the valve cover (2) and the valve body (1), and the diaphragm is connected to the valve disc (4) by fasteners (7), the valve seat (5) is disposed inside the valve body (1) for sealing cooperation with the diaphragm, and the actuator (6) drives the valve stem (3) and the valve disc (4) to reciprocate, characterized in that: The diaphragm includes a first diaphragm (8) and a second diaphragm (9). The valve cover (2) is connected to the valve body (1) through a connector (10). The connector (10) also passes through the first diaphragm (8) and is connected to the valve body (1). The edge of the second diaphragm (9) abuts against the side wall of the connector (10), and the edge of the second diaphragm (9) also has a protruding flange (11). The valve cover (2) has a recessed annular groove (12) that matches the flange (11).

2. The double-diaphragm reinforced sealing diaphragm valve according to claim 1, characterized in that: The valve body (1) is provided with a locking member (13) for connecting the connector (10). The connector (10) includes a first threaded section (14), a smooth rod section (15), and a second threaded section (16) arranged in sequence. When the valve cover (2) is fixedly installed on the valve body (1), the first threaded section (14) is threadedly connected to the valve cover (2). The smooth rod section (15) penetrates the edge of the first diaphragm (8), and the edge of the second diaphragm (9) abuts against the side wall of the smooth rod section (15). The second threaded section (16) is threadedly connected to the locking member (13).

3. The double-diaphragm reinforced sealing diaphragm valve according to claim 1, characterized in that: The valve seat (5) is also provided with a U-shaped diaphragm (17), both ends of which are connected to the valve seat (5) by an interference fit, and a buffer cavity (18) is formed between the middle part of the U-shaped diaphragm (17) and the valve seat (5).

4. The double-diaphragm reinforced sealing diaphragm valve according to claim 1, characterized in that: The second diaphragm (9) has a protruding abutment protrusion (19) on the side near the valve disc (4). The valve disc (4) is also provided with at least two sets of pressure film assemblies. The two sets of pressure film assemblies are evenly distributed around the abutment protrusion (19). The pressure film assembly includes a pressure plate (20) and a rotating shaft (21). The pressure plate (20) is rotatably mounted on the valve disc (4) through the rotating shaft (21). When the valve disc (4) is closed, the pressure plate (20) presses down on the part of the second diaphragm (9) corresponding to the abutment protrusion (19).

5. The double-diaphragm reinforced sealing diaphragm valve according to claim 4, characterized in that: The valve disc (4) has a connecting groove (22) for the abutment protrusion (19) to extend into. The rotating shaft (21) is also located on the inner circumference of the connecting groove (22). The end face of the pressure plate (20) near the second diaphragm (9) is the contact surface (23). The contact surface (23) and the end face of the valve disc (4) form a continuous arc surface.

6. The double-diaphragm reinforced sealing diaphragm valve according to claim 4, characterized in that: The pressure film assembly also includes an elastic element (24). The valve disc (4) has an installation groove (25) into which the elastic element (24) extends. One end of the elastic element (24) abuts against the inner wall of the installation groove (25), and the other end abuts against the end of the pressure plate (20) away from the rotating shaft (21).

7. The double-diaphragm reinforced sealing diaphragm valve according to claim 6, characterized in that: The inner wall of the mounting groove (25) is also provided with a limiting rod (26) for the elastic element (24) to be fitted. The end face of the pressure plate (20) away from the rotating shaft (21) is provided with an annular platform (27). The annular platform (27) forms a limiting groove (28) for the end of the elastic element (24) to extend into. When the pressure plate (20) rotates to fit with the valve disc (4), the annular platform (27) extends into the mounting groove (25).

Images