Diaphragm valve

Abstract

The utility model discloses a diaphragm valve, which comprises a valve main body, a valve core, a valve core and a diaphragm, an upper housing; a diaphragm assembly; the pushing assembly drives the diaphragm assembly to block or open the valve port through reciprocating motion; the valve body is provided with an installation platform surrounding the valve port, the outer edge of the diaphragm assembly is clamped between the installation platform and the upper shell, the top of the installation platform is provided with a first annular sealing rib surrounding the valve port, and the bottom of the diaphragm assembly is provided with a second annular sealing rib coaxial with the first annular sealing rib. The second annular sealing rib abuts against the side wall of the first annular sealing rib. The area of the abutting face between the diaphragm assembly and the installation platform can be increased through the first annular sealing rib and the second annular sealing rib, then the sealing effect between the diaphragm assembly and the installation platform is enhanced, and when water flow flows through the valve port, the water flow can be prevented from leaking out through the space between the valve body and the diaphragm assembly.

Description

Technical Field

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

[0002] A diaphragm valve is a special form of stop valve. Its opening and closing structure is a diaphragm assembly made of soft material. The diaphragm assembly deforms under the push of the pushing assembly to abut against or disengage from 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, and cut off or allow the water flow to pass through. It is widely used in pipelines for transmitting high-purity media such as ultrapure water.

[0003] At present, in order to allow a large water flow to pass through quickly when opening the valve port, the diaphragm of the diaphragm valve on the market usually adopts a relatively soft material to increase the opening and closing stroke of the diaphragm. However, limited by its soft material, when the diaphragm closes the valve port, the diaphragm is extremely easy to deform under the impact of the water flow with a large water pressure, so that the diaphragm and the periphery of the valve port cannot be well sealed, resulting in poor sealing between the diaphragm and the valve body on the periphery of the valve port, and further resulting in that the water flow is extremely easy to leak from between the diaphragm and the valve body, and the safety is relatively low. Summary of the Utility Model

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

[0005] To solve the above technical problem, the utility model adopts the following technical scheme: A diaphragm valve includes a valve body having an inflow channel, an outflow channel and a valve port for fluid to pass through, and 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 for opening and closing the valve port; a pushing assembly slidably connected in the upper housing and connected to the diaphragm assembly to drive the diaphragm assembly to block or open the valve port through reciprocating motion; the valve body has an installation platform surrounding the valve port, the outer edge of the diaphragm assembly is clamped between the installation platform and the upper housing, a first annular sealing rib surrounding the valve port is provided at the top of the installation platform, a second annular sealing rib coaxial with the first annular sealing rib is provided at the bottom of the diaphragm assembly, and the second annular sealing rib abuts against the side wall of the first annular sealing rib. The technical scheme has the following technical effects:

[0006] In the present utility model, a first annular sealing rib and a second annular sealing rib are respectively arranged at the bottom of the diaphragm assembly and the top of the installation platform, and the side walls of the first annular sealing rib and the second annular sealing rib are abutted against each other, so that the contact area between the diaphragm assembly and the installation platform can be increased through the first annular sealing rib and the second annular sealing rib, thereby enhancing the sealing effect between the diaphragm assembly and the installation platform. When water flows through the valve port, water leakage between the valve body and the diaphragm assembly can be avoided, ensuring that the water flowing into the channel flows steadily through the valve port into and out of the channel. When the diaphragm valve transmits high-pressure and high-flow-rate fluids, the transmission safety can be greatly improved.

[0007] In the above-mentioned diaphragm valve, the two opposite side walls of the first annular sealing rib are inclined, so that the thickness of the first annular sealing rib gradually decreases from bottom to top. When protruding from the installation platform by the same height, the inclined side walls enable the first annular sealing rib to have a larger side surface to abut against the second annular sealing rib, thereby enhancing the sealing performance between the diaphragm assembly and the installation platform. During assembly, the first annular sealing rib with inclined side walls can guide the second annular sealing rib, making it easier for the second annular sealing rib to be hermetically fitted with the first annular sealing rib, without the need for precise alignment of the first annular sealing rib and the second annular sealing rib in the vertical direction, reducing the assembly difficulty. At the same time, since the thickness of the first annular sealing rib gradually decreases from bottom to top, the connection between the first annular sealing rib and the installation platform can be made stable, avoiding breakage of the first annular sealing rib and ensuring the stable abutment of the first annular sealing rib against the second annular sealing rib.

[0008] In the above-mentioned diaphragm valve, the side wall of the first annular sealing rib is an inclined surface; or, the side wall of the first annular sealing rib is an arc surface arched towards the outside of the first annular sealing rib. By setting the side wall of the first annular sealing rib as an inclined surface, the production and processing difficulty of the first annular sealing rib can be reduced; by setting the side wall of the first annular sealing rib as an arc surface, the contact area between the first annular sealing rib and the second annular sealing rib can be increased as much as possible, further enhancing the sealing effect.

[0009] In the above-mentioned diaphragm valve, the second annular sealing rib is located inside the first annular sealing rib to abut against the side wall of the first annular sealing rib facing the valve port. When the water flow with a relatively high pressure wants to flow between the abutted diaphragm assembly and the installation platform, it will push the second annular sealing rib towards the first annular sealing rib, making the second annular sealing rib fit more tightly with the first annular sealing rib, enhancing the sealing performance between the first annular sealing rib and the second annular sealing rib, avoiding water leakage, and having a good sealing effect.

[0010] In the above-mentioned diaphragm valve, a first annular sealing groove coaxial with the second annular sealing rib is provided at the bottom of the diaphragm assembly. The first annular sealing rib is inserted into the first annular sealing groove and abuts against the inner wall of the first annular sealing groove. When the upper housing and the installation platform jointly clamp the diaphragm assembly, the first annular sealing rib on the installation platform is inserted into the first annular sealing groove. The setting of the first annular sealing groove increases the abutting area between the diaphragm assembly and the first annular sealing rib, improves the sealing effect, and does not need to be achieved by bending the diaphragm assembly, preventing excessive bending damage to the edge of the diaphragm assembly and prolonging the service life of the diaphragm assembly.

[0011] In the above-mentioned diaphragm valve, the height of the first annular sealing rib is greater than the depth of the first annular sealing groove, so that the second annular sealing rib abuts against the side wall of the first annular sealing rib facing the valve port. This makes the first annular sealing groove only able to sleeve on the upper half of the first annular sealing rib, and the second annular sealing rib can fit on the part of the first annular sealing rib outside the first annular sealing groove. While the structure is simple, the sealing effect is enhanced.

[0012] In the above-mentioned diaphragm valve, a second annular sealing groove cooperating with the second annular sealing rib is provided on the installation platform, and the side wall of the first annular sealing rib extends towards the second annular sealing groove to form the inner side wall of the second annular sealing groove. When the diaphragm assembly is clamped between the upper housing and the installation platform, the second annular sealing rib is inserted into the second annular sealing groove. Because one of the inner side walls of the second annular sealing groove is formed by the extension of the side wall of the first annular sealing rib, the second annular sealing rib can both maintain abutting against the side wall of the first annular sealing rib and enhance the sealing between the diaphragm assembly and the installation platform by abutting against the other inner walls of the second annular sealing groove.

[0013] In the above-mentioned diaphragm valve, the diaphragm assembly includes a first diaphragm and a second diaphragm arranged in a stacked manner. The second diaphragm is arranged above the first diaphragm. The outer edges of the first diaphragm and the second diaphragm are clamped between the upper housing and the installation platform, and the first annular sealing rib is arranged at the bottom of the first diaphragm. The setting of the double diaphragms can reduce the thickness of a single diaphragm and increase the deformation amount of a single diaphragm. When the diaphragm assembly opens the valve port, the first diaphragm is more likely to deform under the impact of water flow, so that a large amount of water can quickly pass through the valve port from the inflow channel into the outflow channel, improving the water passing capacity of the diaphragm valve.

[0014] In the above-mentioned diaphragm valve, the strength of the second diaphragm is greater than that of the first diaphragm. When the diaphragm assembly closes the valve port under the push of the pushing assembly, since the strength of the second diaphragm is greater than that of the first diaphragm, the second diaphragm is less likely to deform compared to the first diaphragm, and can support the first diaphragm, enabling the first diaphragm to have a better closing effect on the valve port, improving the sealing performance, and preventing the first diaphragm from opening the valve port under the impact of high-pressure water flow. The structure of the diaphragm assembly formed by combining two diaphragms with different strengths enables the diaphragm assembly to allow a large amount of water flow to pass quickly through the deformation of the first diaphragm when opening the valve port, and also to prevent the first diaphragm from being opened by the impact of high-pressure water flow through the support of the second diaphragm for the first diaphragm when closing the valve port.

[0015] In the above-mentioned diaphragm valve, an anti-slip protrusion is provided at the top of the first diaphragm, which is arranged around the central axis of the first diaphragm, and an anti-slip groove is provided at the bottom of the second diaphragm, which is embedded in the anti-slip protrusion; the outer peripheral side of the first diaphragm is bent downward to form an anti-slip protrusion at the top of the first diaphragm. The anti-slip protrusion is embedded in the anti-slip groove to provide installation limitation for the first diaphragm and the second diaphragm in the horizontal direction. While facilitating the rapid assembly of the first diaphragm and the second diaphragm, it increases the friction between the first diaphragm and the second diaphragm, so as to prevent the edge of the first diaphragm from slipping out between the installation platform and the second diaphragm when the first diaphragm deforms, ensuring the seal between the first diaphragm and the installation platform. At the same time, the first diaphragm is bent to form an anti-slip protrusion, which can save materials, simplify the processing difficulty, and reduce the production cost.

[0016] The features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. Brief Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0018] Figure 1 is a perspective view of the diaphragm valve in Embodiment 1;

[0019] Figure 2 is a perspective view of the valve body in Embodiment 1;

[0020] Figure 3 is an exploded view of the diaphragm valve in Embodiment 1;

[0021] Figure 4 is a cross-sectional view of the diaphragm valve when the valve port is open in Embodiment 1;

[0022] Figure 5 is Figure 4 the enlarged view of Part A;

[0023] Figure 6 is a perspective view of the first diaphragm in Embodiment 1;

[0024] Figure 7Isometric view of the second diaphragm in Embodiment 1;

[0025] Figure 8 Is a cross-sectional view of the diaphragm valve when the valve port is closed in Embodiment 1.

[0026] Reference numerals:

[0027] 100, valve body; 110, inflow channel; 120, outflow channel; 130, valve port; 140, water retaining platform; 150, mounting platform; 151, first annular sealing rib;

[0028] 200, upper housing; 210, limiting groove;

[0029] 300, diaphragm assembly; 310, first diaphragm; 311, second annular sealing rib; 312, first annular sealing groove; 313, anti-slip protrusion; 320, second diaphragm; 321, anti-slip groove; 322, limiting protrusion;

[0030] 400, pushing assembly. Detailed implementation mode

[0031] A diaphragm valve proposed by the present utility model includes a valve body having an inflow channel, an outflow channel, and a valve port for fluid passage, and 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 for opening and closing the valve port; a pushing assembly slidably connected in the upper housing and connected to the diaphragm assembly to drive the diaphragm assembly to block or open the valve port through reciprocating motion; the valve body has a mounting platform surrounding the valve port, the outer edge of the diaphragm assembly is clamped between the mounting platform and the upper housing, the top of the mounting platform is provided with a first annular sealing rib surrounding the valve port, and the bottom of the diaphragm assembly is provided with a second annular sealing rib coaxial with the first annular sealing rib, and the side wall of the second annular sealing rib abuts against the side wall of the first annular sealing rib. By respectively providing the first annular sealing rib and the second annular sealing rib at the bottom of the diaphragm assembly and the top of the mounting platform, and making the side walls of the first annular sealing rib and the second annular sealing rib abut against each other, the contact area between the diaphragm assembly and the mounting platform can be increased through the first annular sealing rib and the second annular sealing rib, thereby enhancing the sealing effect between the diaphragm assembly and the mounting platform. When water flows through the valve port, it can prevent water from leaking between the valve body and the diaphragm assembly, ensuring that the water flow in the inflow channel can stably flow through the valve port into the outflow channel. When the diaphragm valve transmits high-pressure and high-flow-rate fluids, the transmission safety can be greatly improved.

[0032] The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0035] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] Embodiment 1:

[0038] A diaphragm valve, such as Figures 1 to 8As shown in the figure, it includes a valve body 100, an upper housing 200, a diaphragm assembly 300, and a pushing assembly 400. The valve body 100 has an inflow channel 110, an outflow channel 120, and a valve port 130, and 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 horizontally separate the inflow channel 110 and the outflow channel 120. The valve port 130 is located above the water retaining platform 140 and is respectively communicated with the inflow channel 110 and the outflow channel 120 to communicate 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 housing 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 housing 200. The bottom of the pushing assembly 400 is connected to the diaphragm assembly 300, and drives the diaphragm assembly 300 to deform through reciprocating motion to open and close the valve port 130. When the pushing assembly 400 does not push the diaphragm assembly 300 downward, the diaphragm assembly 300 is disengaged from the top of the water retaining platform 140, 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 pushing assembly 400 pushes the diaphragm assembly 300 downward, the diaphragm assembly 300 deforms and 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 blocks the valve port 130 and blocks the water flow flowing from the inflow channel 110 to the outflow channel 120.

[0039] The valve body 100 has an installation platform 150 surrounding the valve port 130. The diaphragm assembly 300 is arranged above the valve port 130. The outer edge of the diaphragm assembly 300 is located between the installation platform 150 and the upper housing 200. The installation platform 150 and the upper housing 200 jointly clamp the outer edge of the diaphragm assembly 300 to make the diaphragm assembly 300 fit on the top surface of the installation platform 150, so as to form a seal between the two. A first annular sealing rib 151 protruding from the top surface of the installation platform 150 is provided on the top of the installation platform 150. The first annular sealing rib 151 is arranged around the valve port 130. A second annular sealing rib 311 protruding from the bottom surface of the diaphragm assembly 300 is provided on the bottom of the diaphragm assembly 300. The second annular sealing rib 311 is coaxially arranged with the first annular sealing rib 151, and the side wall of the second annular sealing rib 311 abuts against the side wall of the first annular sealing rib 151.

[0040] The utility model arranges a first annular sealing rib 151 and a second annular sealing rib 311 at the bottom of the diaphragm assembly 300 and the top of the mounting platform 150 respectively, and abuts the side walls of the first annular sealing rib 151 and the second annular sealing rib 311, so that the abutting surface area between the diaphragm assembly 300 and the mounting platform 150 can be increased by the first annular sealing rib 151 and the second annular sealing rib 311, thereby enhancing the sealing effect between the diaphragm assembly 300 and the mounting platform 150. When water flows through the valve port 130, it can be prevented from leaking through the valve body 100 and the diaphragm assembly 300, ensuring that the water flowing into the channel 110 stably flows through the valve port 130 into the outflow channel 120. When the diaphragm valve transmits a fluid with high pressure and high flow rate, the transmission safety can be greatly improved.

[0041] In this embodiment, the two opposite side walls of the first annular sealing rib 151 are both inclined. Figure 2 As shown, the thickness of the first annular sealing rib 151 gradually decreases from bottom to top, so that the cross-section of the first annular sealing rib 151 is triangular. When protruding at the same height from the mounting platform 150, the inclined side wall enables the first annular sealing rib 151 to have a larger side surface to abut the second annular sealing rib 311, thereby enhancing the sealing between the diaphragm assembly 300 and the mounting platform 150. During assembly, the first annular sealing rib 151 with the inclined side wall can guide the second annular sealing rib 311, so that the second annular sealing rib 311 is more easily sealed and fitted with the first annular sealing rib 151, and there is no need to accurately align the first annular sealing rib 151 and the second annular sealing rib 311 in the vertical direction, thereby reducing the difficulty of assembly. At the same time, because the thickness of the first annular sealing rib 151 gradually decreases from bottom to top, the connection between the first annular sealing rib 151 and the mounting platform 150 can be stabilized, thereby avoiding the first annular sealing rib 151 from breaking, and ensuring the stable abutment of the first annular sealing rib 151 against the second annular sealing rib 311. The side wall of the first annular sealing rib 151 in the present embodiment is preferably a slope. Of course, it is understandable that the side wall of the first annular sealing rib in the present embodiment may also be an arc surface, with the arc surface facing the valve port arching toward the central axis of the valve port, and the arc surface away from the valve port arching in the opposite direction.

[0042] In this embodiment, the second annular sealing rib 311 is located inside the first annular sealing rib 151. The outer wall of the second annular sealing rib 311 facing away from its central axis abuts against the inner wall of the first annular sealing rib 151 (i.e., the side wall of the first annular sealing rib 151 facing the valve port 130). When the water flow with a relatively high pressure wants to flow between the abutted diaphragm assembly 300 and the mounting platform 150, it will push the second annular sealing rib 311 towards the first annular sealing rib 151, making the fit between the second annular sealing rib 311 and the first annular sealing rib 151 tighter, enhancing the sealing performance between the first annular sealing rib 151 and the second annular sealing rib 311, preventing water from leaking out, and having a good sealing effect.

[0043] As Figure 5 and Figure 6 shown, a first annular sealing groove 312 is provided at the bottom of the diaphragm assembly 300 in this embodiment. The first annular sealing groove 312 is coaxially arranged with the second annular sealing rib 311. When the upper housing 200 and the mounting platform 150 jointly clamp the diaphragm assembly 300, the first annular sealing rib 151 on the mounting platform 150 is inserted into the first annular sealing groove 312. The setting of the first annular sealing groove 312 increases the abutting area between the diaphragm assembly 300 and the first annular sealing rib 151, improves the sealing effect, and does not need to be achieved by bending the diaphragm assembly 300, preventing the edge of the diaphragm assembly 300 from being bent excessively and damaged, and prolonging the service life of the diaphragm assembly 300. In this embodiment, preferably, the height of the first annular sealing rib 151 is set to be greater than the depth of the first annular sealing groove 312, so that the first annular sealing groove 312 can only be sleeved on the upper half of the first annular sealing rib 151, and the second annular sealing rib 311 can be attached to the part of the first annular sealing rib 151 outside the first annular sealing groove 312. While the structure is simple, the sealing effect is enhanced.

[0044] As Figure 3 and Figure 4 shown, the diaphragm assembly 300 in this embodiment includes a first diaphragm 310 and a second diaphragm 320. The first diaphragm 310 and the second diaphragm 320 are stacked, and the second diaphragm 320 is arranged above the first diaphragm 310. Their projections on the horizontal plane coincide. The upper housing 200 and the mounting platform 150 simultaneously clamp the outer edges of the first diaphragm 310 and the second diaphragm 320 to simultaneously install and limit the first diaphragm 310 and the second diaphragm 320. The first annular sealing rib 151 is arranged at the bottom of the first diaphragm 310. The setting of the double diaphragms can reduce the thickness of a single diaphragm and increase the deformation amount of a single diaphragm. When the diaphragm assembly 300 opens the valve port 130, the first diaphragm 310 under the impact of the water flow is more likely to deform, so that a large amount of water can quickly pass through the valve port 130 from the inflow channel 110 into the outflow channel 120, improving the water passing capacity of the diaphragm valve.

[0045] The first diaphragm 310 and the second diaphragm 320 can be made of different materials, or the thickness of the second diaphragm 320 can be set to be greater than that of the first diaphragm 310, so that the strength of the second diaphragm 320 is greater than that of the first diaphragm 310. As Figure 8 shown, when the diaphragm assembly 300 closes the valve port 130 under the push of the pushing assembly 400, since the strength of the second diaphragm 320 is greater than that of the first diaphragm 310, the second diaphragm 320 is less likely to deform compared to the first diaphragm 310, and can support the first diaphragm 310, making the closing effect of the first diaphragm 310 on the valve port 130 better, improving the sealing performance, and preventing the first diaphragm 310 from opening the valve port 130 under the impact of high-pressure water flow. The structure of the diaphragm assembly 300 formed by combining two diaphragms with different strengths enables the diaphragm assembly 300 to allow a large amount of water flow to pass quickly through the deformation of the first diaphragm 310 when opening the valve port 130, and also to prevent the first diaphragm 310 from being opened by the impact of high-pressure water flow on the valve port 130 through the support of the second diaphragm 320 for the first diaphragm 310 when closing the valve port 130.

[0046] As Figure 6 shown, anti-slip protrusions 313 are provided on the top of the first diaphragm 310. The anti-slip protrusions 313 are arranged around the central axis of the first diaphragm 310. As Figure 7 shown, anti-slip grooves 321 are provided on the bottom of the second diaphragm 320. The anti-slip grooves 321 are arranged around the central axis of the second diaphragm 320 to cooperate with the anti-slip protrusions 313. The anti-slip protrusions 313 are fitted into the anti-slip grooves 321 to perform installation limit on the first diaphragm 310 and the second diaphragm 320 in the horizontal direction. While facilitating the rapid assembly of the first diaphragm 310 and the second diaphragm 320, the friction between the first diaphragm 310 and the second diaphragm 320 is increased to prevent the edge of the first diaphragm 310 from disengaging from between the installation platform 150 and the second diaphragm 320 when the first diaphragm 310 deforms, ensuring the seal between the first diaphragm 310 and the installation platform 150. Of course, the positions of the anti-slip protrusions 313 and the anti-slip grooves 321 can also be exchanged. In this embodiment, the anti-slip protrusions 313 are formed by bending the outer peripheral side of the first diaphragm 310 downward. The downwardly bent first diaphragm 310 forms the anti-slip protrusions 313 on the top of the first diaphragm 310, which is simple to process. The anti-slip protrusions 313 are located above the first annular sealing groove 312, so that when processing the first diaphragm 310, the anti-slip protrusions 313 and the first annular sealing groove 312 can be formed simultaneously by one-time bending processing, saving materials, simplifying the processing difficulty, and reducing the production cost. In this embodiment, a limiting protrusion 322 can also be provided on the top of the second diaphragm 320, and a limiting groove 210 can be provided on the bottom of the upper housing 200 to prevent the edge of the second diaphragm 320 from disengaging from between the installation platform 150 and the first diaphragm 310 through the insertion of the limiting protrusion 322 and the limiting groove 210.

[0047] Embodiment 2:

[0048] The difference between this embodiment and the first embodiment is that in this embodiment, a second annular sealing groove is provided at the top of the installation platform. The second annular sealing groove is arranged adjacent to the first annular sealing rib. The side wall of the first annular sealing rib extends into the second annular sealing groove so that the side wall of the first annular sealing rib and the inner side wall of the second annular sealing groove are in the same plane. When the diaphragm assembly is clamped between the upper shell and the installation platform, the second annular sealing rib is inserted into the second annular sealing groove. Since one of the inner side walls of the second annular sealing groove is formed by the extension of the side wall of the first annular sealing rib, the second annular sealing rib can not only keep abutting against the side wall of the first annular sealing rib, but also enhance the sealing performance between the diaphragm assembly and the installation platform by abutting against other inner walls of the second annular sealing groove.

[0049] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications should also be regarded as the protection scope 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 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 for opening and closing the valve port; A pushing assembly slidably connected in the upper housing and connected to the diaphragm assembly to drive the diaphragm assembly to block or open the valve port through reciprocating motion; characterized in that: The valve body has an installation platform surrounding the valve port, the outer edge of the diaphragm assembly is clamped between the installation platform and the upper housing, a first annular sealing rib surrounding the valve port is provided at the top of the installation platform, and a second annular sealing rib coaxial with the first annular sealing rib is provided at the bottom of the diaphragm assembly, and the second annular sealing rib abuts against the side wall of the first annular sealing rib.

2. The diaphragm valve according to claim 1, wherein: Two opposite side walls of the first annular sealing rib are inclined so that the thickness of the first annular sealing rib gradually decreases from bottom to top.

3. The diaphragm valve according to claim 2, wherein: The side wall of the first annular sealing rib is an inclined surface; or, the side wall of the first annular sealing rib is an arc surface arched towards the outside of the first annular sealing rib.

4. A diaphragm valve according to any one of claims 1 to 3, characterized in that: The second annular sealing rib is located inside the first annular sealing rib to abut against the side wall of the first annular sealing rib facing the valve port.

5. A diaphragm valve according to claim 4, characterized in that: A first annular sealing groove coaxial with the second annular sealing rib is provided at the bottom of the diaphragm assembly, and the first annular sealing rib is inserted into the first annular sealing groove and abuts against the inner wall of the first annular sealing groove.

6. A diaphragm valve according to claim 5, characterized in that: The height of the first annular sealing rib is greater than the depth of the first annular sealing groove so that the second annular sealing rib abuts against the side wall of the first annular sealing rib facing the valve port.

7. A diaphragm valve according to claim 5, characterized in that: A second annular sealing groove cooperating with the second annular sealing rib is provided on the installation platform, and the side wall of the first annular sealing rib extends towards the second annular sealing groove to form the inner side wall of the second annular sealing groove.

8. A diaphragm valve according to claim 1, characterized in that: The diaphragm assembly includes a first diaphragm and a second diaphragm stacked, the second diaphragm is arranged above the first diaphragm, the outer edges of the first diaphragm and the second diaphragm are clamped between the upper housing and the installation platform, and the first annular sealing rib is arranged at the bottom of the first diaphragm.

9. A diaphragm valve according to claim 8, characterized in that: The strength of the second diaphragm is greater than that of the first diaphragm.

10. A diaphragm valve according to claim 8, characterized in that: Anti-slip protrusions are provided at the top of the first diaphragm surrounding the central axis of the first diaphragm, and anti-slip grooves are provided at the bottom of the second diaphragm and embedded in the anti-slip protrusions; the outer peripheral side of the first diaphragm is bent downward to form the anti-slip protrusions at the top of the first diaphragm.

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