Diaphragm valve

Abstract

The utility model discloses a diaphragm valve, which comprises a valve main body, which is provided with an inflow channel, an outflow channel and a valve port for fluid to pass through, and is also provided with a water retaining table for separating the inflow channel and the outflow channel; an upper housing; a diaphragm assembly; a pushing assembly; the diaphragm assembly comprises a sealing film and a first sealing rib, the first sealing rib is in a strip shape and arranged on the sealing face, facing the valve port, of the sealing film, the sealing face, facing the valve port, of the sealing film is further provided with a second sealing rib surrounding the first sealing rib, and the bottom of the second sealing rib abuts against the valve body. The diaphragm assembly is arranged to be the sealing film, the first sealing rib and the second sealing rib are arranged on the bottom face of the sealing film, the second sealing rib enhances the sealing performance between the sealing film and the valve body on the peripheral side of the valve port, and when the valve port is closed by the diaphragm assembly, the first sealing rib can compensate the gap between the sealing film and the water blocking table; the sealing performance between the diaphragm assembly and the water retaining table is improved, stable opening and closing of the diaphragm valve are guaranteed, and water leakage of the diaphragm valve is prevented.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and in particular relates to a diaphragm valve. Background Art

[0002] The diaphragm valve is a special form of shut-off valve. Its opening and closing structure is a diaphragm assembly made of soft material. The diaphragm assembly is deformed under the push of the pushing assembly to abut or disengage with the water retaining platform structure below, so as to realize the opening and closing of the valve port connecting the water inlet channel and the water outlet channel, so as to cut off the water flow or supply water flow. It is widely used in pipelines for the transmission of high-purity media such as ultrapure water.

[0003] At present, the diaphragm valves on the market have the following shortcomings: when the diaphragm assembly closes the valve port, a gap is easily generated between the deformed diaphragm assembly and the top of the water retaining platform, and the diaphragm assembly cannot form a good seal with the water retaining platform. Some fluids can easily pass through the gap, resulting in the diaphragm valve being unable to completely cut off the transmitted fluid, especially when transmitting corrosive fluids, which has low safety. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a diaphragm valve to solve the problem of poor sealing performance of the diaphragm valve.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a diaphragm valve, comprising: a valve body, which has an inflow channel, an outflow channel and a valve port for fluid to pass through, and also has a water retaining platform separating the inflow channel and the outflow channel, and the valve port is used to connect the inflow channel and the outflow channel; an upper shell, connected to the upper end of the valve body; a diaphragm assembly, the outer edge of which is clamped between the valve body and the upper shell on the side of the valve port, and the valve port is opened and closed by abutting or disengaging with the water retaining platform; a pushing assembly, which is slidably connected in the upper shell and connected to the diaphragm assembly to drive the deformation of the diaphragm assembly; the diaphragm assembly includes a sealing membrane and a first sealing rib, the first sealing rib is strip-shaped and is provided on the sealing surface of the sealing membrane facing the valve port, the first sealing rib is abutted with the top of the water retaining platform to form a seal between the inflow channel and the outflow channel, and a second sealing rib surrounding the first sealing rib is also provided on the sealing surface of the sealing membrane facing the valve port, the bottom of the second sealing rib is abutted against the valve body, and the two ends of the first sealing rib are respectively connected to the second sealing rib. This technical solution has the following technical effects:

[0006] The utility model configures the diaphragm assembly into a sealing membrane, and provides a first sealing rib and a second sealing rib on the bottom surface of the sealing membrane, so that when the sealing membrane is clamped by the valve body and the upper shell body on the periphery of the valve port, a seal can be formed between the outer peripheral side of the sealing surface and the valve body on the periphery of the valve port. At the same time, the second sealing rib abuts against the valve body on the periphery of the valve port to fill the gap between the sealing surface and the valve body, thereby further enhancing the sealing between the sealing membrane and the valve body on the periphery of the valve port. When water flows through the valve port, water can be prevented from leaking through the valve body and the sealing membrane, thereby ensuring that the water flowing into the channel stably flows through the valve port into the outflow channel. When the first sealing rib pushes the diaphragm assembly downward, it can be deformed with the sealing membrane and abut against the top of the water retaining platform to form a seal and blockage between the inflow channel and the outflow channel, thereby closing the valve port. The first sealing rib can compensate for the gap between the sealing surface and the water retaining platform to prevent water from passing through the gap between the two. At the same time, the first sealing rib can enhance the pressure at the abutting position between the sealing membrane and the water retaining platform to prevent the sealing membrane pressed on the water retaining platform from being deformed by the impact of the water flow and unable to seal with the water retaining platform when the diaphragm assembly closes the valve port, thereby greatly improving the sealing between the diaphragm assembly and the water retaining platform, ensuring the stable opening and closing of the diaphragm valve, and preventing the diaphragm valve from leaking.

[0007] In the above-mentioned diaphragm valve, the first sealing rib is arranged to pass through the center of the second sealing rib, and the connection position between the pushing assembly and the sealing membrane coincides with the center of the second sealing rib in the vertical direction. When the pushing assembly pushes the sealing membrane downward, the center position of the sealing membrane is subjected to force to cause its peripheral side to deform, making the overall deformation of the sealing membrane more uniform, ensuring that the first sealing rib can be stably attached to the top of the water retaining platform, thereby ensuring a stable seal between the diaphragm assembly and the water retaining platform. On the other hand, as the first sealing rib moves up and down, the force exerted on the second sealing rib pressed against the valve body is also uniform, which is also conducive to maintaining a seal between the second sealing rib and the valve body.

[0008] In the above-mentioned diaphragm valve, an abutment surface surrounding the valve opening is provided on the valve body, and the distance between the abutment surface and the central axis of the valve opening gradually decreases from top to bottom, and the outer peripheral side of the second sealing rib abuts against the abutment surface. When protruding from the valve body at the same height, the inclined abutment surface can have a larger area, thereby increasing the abutment area between the abutment surface and the second sealing rib, thereby enhancing the sealing effect. During assembly, the inclined abutment surface can guide the second sealing rib and is also easier to quickly fit with the second sealing rib. There is no need to precisely align the abutment surface and the outer peripheral side of the second sealing rib in the vertical direction, thereby reducing the difficulty of assembly. In addition, by providing an inclined abutment surface, the second sealing rib can abut more against the abutment surface when subjected to pressure in the flow channel, thereby preventing the second sealing rib from further deformation, thereby ensuring the sealing effect.

[0009] In the aforementioned diaphragm valve, the abutting surface is an inclined surface; or, alternatively, the abutting surface is an arcuate surface that arches toward the central axis of the valve port. By configuring the abutting surface as an inclined surface, the difficulty of manufacturing and processing the abutting surface can be reduced; by configuring the abutting surface as an arcuate surface, the abutting area between the abutting surface and the second sealing rib can be maximized, further enhancing the sealing effect.

[0010] In the aforementioned diaphragm valve, the valve body has a centerline O. When the top of the water retaining platform is at a horizontal distance A from the centerline along its extension direction, the width of the top surface of the water retaining platform is B, satisfying (B / 2A) ≥ tan(0.8°). When this ratio is met, the first sealing rib and the water retaining platform are always in contact. That is, when the sealing membrane rotates slightly relative to the water retaining platform at an angle of less than 0.8 degrees, the seal between the first sealing rib and the top surface of the water retaining platform is maintained.

[0011] In the aforementioned diaphragm valve, a limiting protrusion and a limiting groove are respectively provided on the outer sidewall of the sealing membrane and the valve body. The limiting protrusion and the limiting groove are transversely inserted into each other to circumferentially limit the sealing membrane. The limiting protrusion is transversely inserted into the limiting groove to facilitate rapid installation and positioning of the diaphragm assembly. The valve body also circumferentially limits the sealing membrane mounted thereon to prevent rotation of the sealing membrane and ensure that a first sealing rib provided at the bottom of the sealing membrane is always aligned with the top surface of the water retaining platform, thereby ensuring a stable seal between the first sealing rib and the water retaining platform.

[0012] In the aforementioned diaphragm valve, one end of the pusher assembly is connected to the center of the sealing membrane, and the other end is connected to a power device. The power device drives the pusher assembly to deform the sealing membrane. The power device drives the pusher assembly up and down, thereby deforming the sealing membrane connected to the pusher assembly, thereby controlling the deformation of the sealing membrane and ensuring stable and reliable operation.

[0013] In the above-mentioned diaphragm valve, the push assembly and the upper housing are locked to prevent the push assembly from rotating when moving up and down, thereby preventing the push assembly from driving the sealing membrane to rotate, ensuring that the first sealing rib is always aligned with the water retaining platform, thereby ensuring a stable seal when the two abut.

[0014] The aforementioned diaphragm valve further includes an upper cover. The valve body is provided with a stopper plate surrounding the outer periphery of the upper housing. The upper cover is threadedly connected to the outer periphery of the stopper plate and abuts against the top of the upper housing, thereby clamping the sealing membrane through the upper housing and the valve body. The upper cover limits the upper housing and prevents it from freely moving upward. In other words, the upper cover presses the sealing membrane against the valve body through the upper housing, ensuring a stable seal between the sealing membrane and the valve body and preventing water leakage.

[0015] In the aforementioned diaphragm valve, the valve body further includes a sealing protrusion, the abutting surface being the inner side surface of the sealing protrusion; and the sealing membrane is provided with a bent portion on the outer side of the second sealing rib for limiting the second sealing rib from moving away from the abutting surface. The provision of the bent portion limits the second sealing rib from moving away from the abutting surface when the valve opening is switched between open and closed states, thereby ensuring a sealed state between the second sealing rib and the abutting surface.

[0016] The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 This is a three-dimensional diagram of a diaphragm valve of the utility model;

[0019] Figure 2 is a three-dimensional diagram of the sealing membrane;

[0020] Figure 3 This is a cross-sectional view of a diaphragm valve of the utility model in a valve port open state;

[0021] Figure 4 is a three-dimensional diagram of the valve body;

[0022] Figure 5 is a top view of the valve body;

[0023] Figure 6 is a schematic cross-sectional view of the valve body;

[0024] Figure 7 This is the assembly drawing of the upper housing and the push assembly;

[0025] Figure 8 This is a cross-sectional view of a diaphragm valve of the utility model in a valve port closed state.

[0026] Reference numerals:

[0027] 100, valve body; 110, inflow channel; 120, outflow channel; 130, valve port; 140, water retaining platform; 150, sealing protrusion; 151, abutting surface; 160, limiting groove; 170, limiting plate;

[0028] 200, upper shell; 210, groove;

[0029] 300, diaphragm assembly; 310, sealing membrane; 311, sealing surface; 312, limiting protrusion; 320, first sealing rib; 330, second sealing rib; 340, bending portion;

[0030] 400, pushing component; 410, convex rib;

[0031] 500. Top cover. DETAILED DESCRIPTION

[0032] The utility model proposes a diaphragm valve, including: a valve body, which has an inflow channel, an outflow channel and a valve port for fluid to pass through, and also has a water retaining platform separating the inflow channel and the outflow channel, and the valve port is used to connect the inflow channel and the outflow channel; an upper shell body, which is connected to the upper end of the valve body; a diaphragm assembly, the outer edge of which is clamped between the valve body and the upper shell body on the periphery of the valve port, and the valve port is opened and closed by abutting or disengaging with the water retaining platform; a pushing assembly, which is slidably connected in the upper shell body and connected to the diaphragm assembly to drive the diaphragm assembly to deform; the diaphragm assembly includes a sealing membrane and a first sealing rib, the first sealing rib is strip-shaped and is arranged on the sealing surface of the sealing membrane facing the valve port, the first sealing rib is abutted and cooperated with the top of the water retaining platform to form a seal between the inflow channel and the outflow channel, and a second sealing rib surrounding the first sealing rib is also provided on the sealing surface of the sealing membrane facing the valve port, the bottom of the second sealing rib is abutted against the valve body, and the two ends of the first sealing rib are respectively connected to the second sealing rib. The utility model configures the diaphragm assembly into a sealing membrane, and provides a first sealing rib and a second sealing rib on the bottom surface of the sealing membrane, so that when the sealing membrane is clamped by the valve body and the upper shell body on the periphery of the valve port, a seal can be formed between the outer peripheral side of the sealing surface and the valve body on the periphery of the valve port. At the same time, the second sealing rib abuts against the valve body on the periphery of the valve port to fill the gap between the sealing surface and the valve body, thereby further enhancing the sealing between the sealing membrane and the valve body on the periphery of the valve port. When water flows through the valve port, water can be prevented from leaking through the valve body and the sealing membrane, thereby ensuring that the water flowing into the channel stably flows through the valve port into the outflow channel. When the first sealing rib pushes the diaphragm assembly downward, it can be deformed with the sealing membrane and abut against the top of the water retaining platform to form a seal and blockage between the inflow channel and the outflow channel, thereby closing the valve port. The first sealing rib can compensate for the gap between the sealing surface and the water retaining platform to prevent water from passing through the gap between the two. At the same time, the first sealing rib can enhance the pressure at the abutting position between the sealing membrane and the water retaining platform to prevent the sealing membrane pressed on the water retaining platform from being deformed by the impact of the water flow and unable to seal with the water retaining platform when the diaphragm assembly closes the valve port, thereby greatly improving the sealing between the diaphragm assembly and the water retaining platform, ensuring the stable opening and closing of the diaphragm valve, and preventing the diaphragm valve from leaking.

[0033] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0036] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] Example 1:

[0039] A diaphragm valve, such as Figures 1 to 8As shown, the valve body 100 includes a valve body, an upper shell 200, a diaphragm assembly 300 and a push assembly 400. The valve body 100 has an inflow channel 110, an outflow channel 120 and a valve port 130. It also has a water retaining platform 140. The water retaining platform 140 is located between the inflow channel 110 and the outflow channel 120 to separate the inflow channel 110 and the outflow channel 120 in the horizontal direction. The valve port 130 is located above the water retaining platform 140 and is respectively connected to the inflow channel 110 and the outflow channel 120. The channel 120 is connected to connect the inflow channel 110 and the outflow channel 120. The fluid in the inflow channel 110 can enter the outflow channel 120 through the valve port 130. The upper shell 200 is connected to the upper end of the valve body 100. The diaphragm assembly 300 is located at the valve port 130. The pushing assembly 400 is slidably connected in the upper shell 200. The bottom of the pushing assembly 400 is connected to the diaphragm assembly 300, which is used to drive the diaphragm assembly 300 to deform to open and close the valve port 130.

[0040] The diaphragm assembly 300 includes a sealing membrane 310, a first sealing rib 320 and a second sealing rib 330. The bottom surface of the sealing membrane 310 facing the valve port 130 is a sealing surface 311. The valve body 100 and the upper shell 200 on the side of the valve port 130 jointly clamp the outer edge of the sealing membrane 310 to form a seal between the outer peripheral side of the sealing surface 311 and the valve body 100 on the side of the valve port 130. The first sealing rib 320 and the second sealing rib 330 are both arranged on the sealing surface 311. The second sealing rib 330 is arranged around the first sealing rib 320, and the bottom of the second sealing rib 330 is against the valve body 100 on the side of the valve port 130. The first sealing rib 320 is strip-shaped, and both ends of the first sealing rib 320 are respectively connected to the second sealing rib 330 and aligned with the top surface of the water retaining platform 140. When the pushing assembly 400 does not push the diaphragm assembly 300 downward, the first sealing rib 320 and the top of the water retaining platform 140 are in a disengaged state, so that the valve port 130 is in an open state, and water can flow through the valve port 130 between the diaphragm assembly 300 and the top of the water retaining platform 140, and flow from the inflow channel 110 into the outflow channel 120. When the push assembly 400 pushes the diaphragm assembly 300 downward, the diaphragm assembly 300 deforms to push the first sealing rib 320 downward until the first sealing rib 320 abuts against the top of the water retaining platform 140 to form a seal between the inflow channel 110 and the outflow channel 120. At this time, the diaphragm assembly 300 closes the valve port 130, blocking the flow of water from the inflow channel 110 to the outflow channel 120. The first sealing rib 320 protrudes from the sealing surface 311 and can compensate for the gap between the sealing surface 311 and the water retaining platform 140 when the diaphragm assembly 300 deforms toward the water retaining platform 140, thereby preventing water from passing through the gap between the two. The first sealing rib 320 in this embodiment can be integrally provided with the sealing membrane 310, or it can be separately provided with the sealing membrane 310. Preferably, the first sealing rib 320 and the sealing membrane 310 are an integral structure to reduce the difficulty of production and processing and reduce assembly costs.

[0041] The present invention configures the diaphragm assembly 300 into a sealing membrane 310, and provides a first sealing rib 320 and a second sealing rib 330 on the bottom surface of the sealing membrane 310, so that when the sealing membrane 310 is clamped by the valve body 100 and the upper shell 200 on the side surrounding the valve port 130, a seal can be formed between the outer peripheral side of the sealing surface 311 and the valve body 100 on the side surrounding the valve port 130. At the same time, the second sealing rib 330 abuts against the valve body 100 on the side surrounding the valve port 130 to fill the gap between the sealing surface 311 and the valve body 100, thereby further enhancing the sealing between the sealing membrane 310 and the valve body 100 on the side surrounding the valve port 130. When water flows through the valve port 130, it can prevent water from leaking through the valve body 100 and the sealing membrane 310, thereby ensuring that the water flowing into the channel 110 stably flows through the valve port 130 into the outflow channel 120. When the push assembly 400 pushes the diaphragm assembly 300 downward, the first sealing rib 320 can be deformed with the sealing membrane 310 and abut against the top of the water retaining platform 140 to form a seal and blockage between the inflow channel 110 and the outflow channel 120, thereby closing the valve port 130. The first sealing rib 320 can compensate for the gap between the sealing surface 311 and the water retaining platform 140 to prevent water from passing through the gap between the two. At the same time, the first sealing rib 320 can enhance the pressure at the position where the sealing membrane 310 abuts the water retaining platform 140, thereby preventing the sealing membrane 310 pressed on the water retaining platform 140 from being deformed by the impact of the water flow and unable to seal with the water retaining platform 140 when the diaphragm assembly 300 closes the valve port 130, thereby greatly improving the sealing between the diaphragm assembly 300 and the water retaining platform 140, ensuring the stable opening and closing of the diaphragm valve, and preventing the diaphragm valve from leaking.

[0042] like Figure 2 As shown, in this embodiment, the first sealing rib 320 is arranged through the center of the second sealing rib 330, and the bottom of the pushing assembly 400 is connected to the center position of the sealing membrane 310, that is, the central axis of the pushing assembly 400 is coaxial with the central axis of the second sealing rib 330. When the pushing assembly 400 pushes the sealing membrane 310 downward, the center position of the sealing membrane 310 is subjected to force to drive its peripheral side to deform, making the overall deformation of the sealing membrane 310 more uniform, ensuring that the first sealing rib 320 can be stably attached to the top of the water retaining platform 140, thereby ensuring a stable seal between the diaphragm assembly 300 and the water retaining platform 140. On the other hand, the first sealing rib 320 moves up and down, and the force exerted on the second sealing rib 330 pressed on the valve body is also uniform, which is also conducive to maintaining a seal between the second sealing rib 330 and the valve body 100.

[0043] The valve body 100 is provided with an abutting surface 151 for abutting the outer peripheral side of the second sealing rib 330 to enhance the sealing between the second sealing rib 330 and the valve body 100. Of course, it is understandable that the abutting surface 151 can be directly located on the valve body 100 surrounding the valve port 130, or on other structures provided on the valve body 100. Preferably, as shown in FIG. Figure 4 As shown, the valve body 100 is provided with an upwardly protruding sealing protrusion 150, which is arranged around the valve port 130, and the abutting surface 151 is arranged on the sealing protrusion 150. The valve body 100 increases the contact area between the valve body 100 and the diaphragm assembly 300 by the abutting surface 151 abutting against the outer peripheral side of the second sealing rib 330, thereby enhancing the sealing between the diaphragm assembly 300 and the valve body 100. The distance between the abutting surface 151 and the central axis of the valve port 130 gradually decreases from top to bottom, that is, the abutting surface 151 is an inclined surface inclined toward the valve port 130. When protruding from the valve body 100 at the same height, the inclined abutting surface 151 can have a larger area, thereby increasing the abutment. The contact area between the surface 151 and the second sealing rib 330 enhances the sealing effect. When water with a relatively high pressure flows between the abutting diaphragm assembly 300 and the valve body 100, it pushes the second sealing rib 330 toward the abutting surface 151, making the second sealing rib 330 and the abutting surface 151 fit more tightly, enhancing the sealing between the second sealing rib 330 and the abutting surface 151, preventing water leakage and achieving a good sealing effect. During assembly, the inclined abutting surface 151 can guide the second sealing rib 330, making it easier to quickly fit the second sealing rib 330, eliminating the need for precise vertical alignment of the abutting surface 151 and the outer periphery of the second sealing rib 330, thereby reducing assembly difficulty. Of course, it is understandable that the abutting surface 151 in this embodiment can also be an arcuate surface that arches toward the central axis of the valve port 130, that is, the longitudinal cross-section of the abutting surface 151 is circular arc-shaped.

[0044] like Figure 5 As shown, the direction indicated by the X-axis is the extension direction of the water retaining platform 140; Figure 6As shown, line O is the center line of the valve body. At the position indicated by point C of the water retaining platform, its horizontal projection distance from the center line is A. At this distance, the top surface width of the water retaining platform 140 is B, satisfying (B / 2A)≥tan(0.8°). When the above ratio is met, it can be ensured that the first sealing rib 320 and the water retaining platform 140 are always in abutment. When the first sealing rib 320 is sealed against the top surface of the water retaining platform 140, and the horizontal extension direction of the first sealing rib 320 is the same as the horizontal extension direction of the water retaining platform 140, even if the sealing membrane 310 rotates slightly at an angle less than 0.8 degrees relative to the water retaining platform 140, the first sealing rib 320 still remains sealed with the top surface of the water retaining platform 140 to ensure the sealing between the first sealing rib 320 and the top surface of the water retaining platform 140.

[0045] In this embodiment, if Figure 2 As shown, a limiting protrusion 312 is provided on the outer wall of the sealing membrane 310, and a limiting groove 160 is provided on the valve body 100. The limiting protrusion 312 is laterally inserted into the limiting groove 160 so as to quickly install and position the diaphragm assembly 300. The valve body 100 can also circumferentially limit the sealing membrane 310 installed thereon to prevent the sealing membrane 310 from rotating, thereby ensuring that the first sealing rib 320 provided at the bottom of the sealing membrane 310 is always aligned with the top surface of the water retaining platform 140, so as to ensure that the first sealing rib 320 can be stably sealed with the water retaining platform 140.

[0046] In this embodiment, the upper end of the push assembly 400 is connected to a power device, and the lower end is connected to the central area of ​​the sealing film 310. The power device is a linear drive device, which is used to drive the push assembly 400 to move up and down, thereby driving the sealing film 310 connected to the push assembly 400 to deform, thereby achieving deformation control of the sealing film 310 to open and close the valve port 130. It should be noted that the power device in this embodiment is a manual device, and in another embodiment, it can also be electric or pneumatic. Figure 7 As shown, a vertically extending rib 410 is provided on the outer wall of the pushing component 400, and a groove 210 that cooperates with the rib 410 is provided on the inner wall of the upper shell 200. The rib 410 is inserted into the groove 210 to prevent the pushing component 400 from rotating with the upper shell 200, thereby preventing the pushing component 400 from rotating when moving up and down, and further preventing the pushing component 400 from driving the sealing membrane 310 to rotate, ensuring that the first sealing rib 320 is always aligned with the water retaining platform 140 to ensure stable sealing when the two are in contact.

[0047] like Figure 3As shown, a vertically extending limit plate 170 is provided on the valve body 100, and the limit plate 170 surrounds the outer peripheral side of the upper shell 200 and is integrally arranged with the valve body 100. The diaphragm valve also includes an upper cover 500, and the inner side wall of the upper cover 500 is provided with an internal thread, and the outer peripheral side of the limit plate 170 is provided with an external thread. The upper cover 500 and the limit plate 170 are threadedly connected by internal and external threads to axially limit the upper cover 500 installed on the valve body 100. The upper cover 500 passes over the top of the limit plate 170 and abuts against the top of the upper shell 200 to limit the upper shell 200 and prevent the upper shell 200 from moving up freely. That is, the upper cover 500 presses the sealing membrane 310 onto the valve body 100 through the upper shell 200 to ensure a stable seal between the sealing membrane 310 and the valve body 100 to prevent water leakage.

[0048] like Figure 8 As shown, the abutment surface 151 is the inner side of the sealing protrusion 150; the sealing membrane is provided with a bent portion 340 on the outer side of the second sealing rib 330 for limiting the second sealing rib 330 from moving away from the abutment surface 151. The provision of the bent portion 340 can limit the second sealing rib 330 from moving away from the abutment surface 151 when the valve port 130 switches between the open and closed states, thereby ensuring that the second sealing rib 330 and the abutment surface 151 remain sealed. As described above, when the diaphragm assembly 300 moves up and down, its inner side swings, which will drive the outer second sealing rib 330 to move to a certain extent, thereby affecting the seal of the second sealing rib 330 during long-term use.

[0049] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A diaphragm valve comprising: a valve body having an inflow channel, an outflow channel and a valve port for fluid to pass through, and further having a water retaining platform separating the inflow channel and the outflow channel, wherein the valve port is used to connect the inflow channel and the outflow channel; An upper housing connected to the upper end of the valve body; a diaphragm assembly, the outer edge of which is clamped between the valve body and the upper shell on the peripheral side of the valve port, and opens and closes the valve port by abutting or disengaging with the water retaining platform; A pushing assembly is slidably connected in the upper shell and connected to the diaphragm assembly to drive the diaphragm assembly to deform; characterized in that: The diaphragm assembly includes a sealing membrane and a first sealing rib. The first sealing rib is strip-shaped and is arranged on the sealing surface of the sealing membrane facing the valve port. The first sealing rib abuts against the top of the water retaining platform to form a seal between the inflow channel and the outflow channel. A second sealing rib surrounding the first sealing rib is also provided on the sealing surface of the sealing membrane facing the valve port. The bottom of the second sealing rib abuts against the valve body, and the two ends of the first sealing rib are respectively connected to the second sealing rib.

2. A diaphragm valve according to claim 1, characterized in that: The first sealing rib is arranged to pass through the center of the second sealing rib, and the connection position between the pushing component and the sealing film coincides with the center of the second sealing rib in the vertical direction.

3. The diaphragm valve according to claim 1, characterized in that: The valve body is provided with an abutting surface surrounding the valve port, the distance between the abutting surface and the central axis of the valve port gradually decreases from top to bottom, and the outer peripheral side of the second sealing rib abuts against the abutting surface.

4. A diaphragm valve according to claim 3, characterized in that: The abutting surface is an inclined surface; or, the abutting surface is an arc surface arched toward the central axis of the valve port.

5. The diaphragm valve according to claim 1, characterized in that: The valve body has a center line O. When the top of the water retaining platform is at a position with a horizontal distance A from the center line along its extension direction, the top surface width of the water retaining platform is B, satisfying (B / 2A)≥tan(0.8°).

6. A diaphragm valve according to claim 1 or 5, characterized in that: A limiting protrusion and a limiting groove are respectively provided on the outer side wall of the sealing membrane and the valve body. The limiting protrusion is laterally plugged into the limiting groove to limit the sealing membrane circumferentially.

7. The diaphragm valve according to claim 1, characterized in that: One end of the pushing component is connected to the central area of ​​the sealing film, and the other end is connected to a power device, and the power device drives the sealing film to deform through the pushing component.

8. The diaphragm valve according to claim 7, characterized in that: The pushing assembly and the upper shell are locked in rotation.

9. The diaphragm valve according to claim 1, characterized in that: It also includes an upper cover, and the valve body is provided with a limit plate surrounding the outer periphery of the upper shell. The upper cover is threadedly connected to the outer periphery of the limit plate and abuts against the top of the upper shell to clamp the sealing membrane together through the upper shell and the valve body.

10. The diaphragm valve according to claim 3, characterized in that: The valve body further comprises a sealing protrusion, and the abutting surface is the inner side surface of the sealing protrusion; the sealing membrane is provided with a bending portion on the outer side of the second sealing rib for limiting the second sealing rib from moving away from the abutting surface.

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