Diaphragm valve

Abstract

The utility model discloses a diaphragm valve, which comprises a valve main body, a diaphragm, a diaphragm and a diaphragm, the valve assembly comprises a valve element, a deformation part and a sealing part. The valve shell is connected to the upper end of the valve main body so as to clamp the sealing part together with the valve main body; the sealing part comprises an inner sealing part and a fixing part arranged around the inner sealing part, the inner sealing part abuts against the inner side wall of the valve body in a sealed mode, and the fixing part is clamped between the valve shell and the valve body. Due to the arrangement of the inner sealing part, even if a gap is formed between the inner sealing part and the valve main body due to the movement of the deformation part, the gap extends axially and the bottom end of the gap is open, particles in fluid are difficult to enter the gap, and the particles are easy to fall off from the gap even if the particles enter the gap; therefore, fluid pollution caused by accumulation of a large number of particles between the sealing part and the valve body is avoided, and the cleanliness of fluid is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the valve field, concretely relates to a diaphragm valve. BACKGROUND

[0002] The diaphragm valve is a kind of special valve, including the valve body with fluid passage, the valve core assembly with diaphragm and the upper shell with diaphragm side clamped together with valve body, can be moved axially to open or close fluid passage or adjust the fluid delivery amount of fluid passage in open state, is widely applied in the pipeline of high-purity medium such as ultrapure water.

[0003] At present, the diaphragm valve on the market has the following shortcomings: the existing diaphragm directly abuts on the top surface of valve body, because diaphragm will be deformed and moves up and down in the process of moving with valve core, the horizontal gap between diaphragm and the top surface of valve body is formed, when the fluid in valve cavity rushes to the gap between diaphragm and valve body under the action of pressure, particulate matter is extremely easy to enter the gap, because the gap extends horizontally, particulate matter is extremely easy to form accumulation at the gap, and the accumulated particulate matter can affect the cleanliness of fluid. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a diaphragm valve to solve the problem that particulate matter accumulation between diaphragm and valve body affects the cleanliness of fluid.

[0005] To solve the above technical problem, the utility model adopts the following technical scheme: a diaphragm valve, comprising, valve body, with liquid inlet flow channel, liquid outlet flow channel and valve cavity for fluid passing, the valve cavity is communicated with the liquid inlet flow channel and the liquid outlet flow channel, valve assembly, including valve core, deformation part located in the outer circumferential side of valve core and sealing part arranged on the outer circumferential side of deformation part, the valve core changes the fluid state in valve cavity by moving along the axial direction, valve shell, connected to the upper end of valve body, to clamp the sealing part together with valve body, the sealing part includes inner sealing part and fixed part arranged around the inner sealing part, the inner sealing part extends axially and seals and abuts on the inner side wall of valve body, the fixed part is connected to the top of inner sealing part and extends radially to be clamped between valve shell and valve body. The technical scheme has the following technical effects:

[0006] The utility model discloses a structure that the sealing part is combined with the inner sealing part and the fixed part, when the fixed part is clamped between the valve body and the valve shell, the inner sealing part at the bottom of the fixed part extends along the axial direction of the valve assembly, and is tightly attached to the inner wall of the valve body and sealed with the inner wall. In actual use, even if the inner sealing part is slightly deformed due to the movement of the deformation part, a gap is formed between the inner sealing part and the inner wall of the valve body. The gap extends axially and is open at the bottom, so even if there are particles in the fluid, the particles are still difficult to enter the gap between the inner sealing part and the inner wall of the valve body, thereby effectively preventing the accumulation of particles. Furthermore, even if particles enter the gap, they are likely to fall downward and escape from the gap, preventing the particles from accumulating in the gap. That is, the structure can effectively prevent particles from accumulating in the sealing part between the valve assembly and the valve body, ensuring the cleanliness of the valve body.

[0007] In the diaphragm valve, the bottom end of the valve shell is provided with an annular limiting surface located directly above the inner sealing part, and the annular limiting surface presses the inner sealing part through the fixed part. When the valve shell and the valve body clamp the fixed part to make the fixed part deform under pressure, and when the fluid impacts the inner sealing part upward, the part of the fixed part located directly above the inner sealing part will cause the inner sealing part to warp upward. Therefore, by providing the annular limiting surface at the bottom end of the valve shell and directly above the inner sealing part, the annular limiting surface can press the inner sealing part through the fixed part to limit the excessive deformation of the fixed part and the inner sealing part upward, ensuring that the inner sealing part is always tightly attached to the inner wall of the valve body, thereby ensuring the sealing effect between the inner sealing part and the valve body. Alternatively, the valve shell is provided with an abutting part located inside the inner sealing part, and the inner sealing part is pressed between the abutting part and the valve body. The abutting part limits the inner sealing part to prevent it from deforming away from the inner wall of the valve body and separating from the inner wall, ensuring stable sealing between the inner sealing part and the inner wall of the valve body.

[0008] In the diaphragm valve, the inner wall of the valve body is a vertical surface, and the inner sealing part only extends axially to fit the inner wall of the valve body. The extension direction of the inner wall of the valve body and the inner sealing part is the same, so that the inner sealing part is tightly attached to the inner wall of the valve body, and the assembly of the valve assembly and the valve body is facilitated. Alternatively, at least one of the valve body and the inner sealing part has an inclined side wall that extends downward in another direction, so that the inner wall of the valve body and the inner sealing part are tightly attached during assembly, improving the sealing effect.

[0009] In the diaphragm valve, the sealing part further comprises an outer sealing part abutting against the valve body, and the outer sealing part is located outside the inner sealing part and connected to the bottom of the fixed part. Through the setting of the outer sealing part, even if the inner sealing part fails to seal, the outer sealing part can cooperate with the valve body to ensure the sealing between the valve assembly and the valve body, and prevent fluid leakage.

[0010] In the diaphragm valve, the outer sealing part, the inner sealing part and the fixed part jointly form an annular sealing groove, and the valve body comprises a body and an annular sealing protrusion, and the annular sealing protrusion is in interference sealing cooperation with the annular sealing groove. The annular sealing protrusion is inserted into the annular sealing groove and is in interference cooperation with the annular sealing groove, so that the inner sealing part is sealingly abutted against the inner side wall of the annular sealing protrusion, and the outer sealing part is sealingly abutted against the outer side wall of the annular sealing protrusion, realizing the sealing connection of the two with the annular sealing protrusion and improving the sealing effect between the sealing part and the valve body.

[0011] In the diaphragm valve, the bottom end of the valve shell has a lowest annular pressing surface, and the annular pressing surface is located directly above the outer sealing part and presses the outer sealing part through the fixed part.

[0012] The setting of the annular pressing surface can press the outer sealing part on the valve body, so that the outer sealing part is tightly sealed with the valve body. The annular pressing surface is the lowest at the bottom end of the valve shell, so that when the valve shell and the valve body are installed, the outer sealing part is subjected to the greatest pressing force, thereby ensuring the best sealing effect at the outer sealing part, so that the outer sealing part plays a major sealing effect. Even if the inner sealing part fails to seal, there will be no leakage between the valve assembly and the valve body. It should be noted that because the inner sealing part is connected to the deformation part, when the deformation part moves up and down with the valve core and deforms, it may cause slight deformation of the inner sealing part, thereby affecting the sealing effect between the inner sealing part and the valve body, so it is difficult to play a major sealing effect through the inner sealing part. Therefore, the outer sealing part plays a major sealing effect, which can effectively avoid the influence of the deformation part movement and deformation on the sealing effect.

[0013] In the diaphragm valve, the bottom end of the valve shell is provided with an annular limiting surface located directly above the inner sealing part, the annular limiting surface presses the inner sealing part through the fixed part, and the bottom end of the valve shell is provided with an annular groove between the annular limiting surface and the annular pressing surface, and the fixed part can be deformed to the annular groove.

[0014] The inner sealing part is pressed by the annular limiting surface, and the outer sealing part is pressed by the annular pressing surface, so that stress is concentrated at the connection between the fixed part and the outer sealing part and the connection between the fixed part and the inner sealing part when the sealing part is pressed, and the structure of the connection is abnormally deformed, which affects the sealing effect between the outer sealing part and the annular sealing protrusion and the sealing effect between the inner sealing part and the annular sealing protrusion. Therefore, the annular groove is arranged between the annular limiting surface and the annular pressing surface, and the fixed part is easily deformed to the annular groove under the action of stress, so that the aforementioned stress can be absorbed, released or dispersed by deforming to the annular groove, and the sealing effect between the inner sealing part and the annular sealing protrusion and the sealing effect between the outer sealing part and the annular sealing protrusion are avoided from being affected.

[0015] In the diaphragm valve, the annular limiting surface is arranged higher than the annular pressing surface, so that the pressure of the valve shell on the sealing part is mainly concentrated on the outer sealing part, and the pressing sealing effect between the outer sealing part and the valve body is ensured; and / or the annular groove is arranged close to the inner sealing part, that is, the distance between the annular groove and the inner sealing part in the horizontal direction is smaller than the distance between the annular groove and the outer sealing part in the horizontal direction, so that the stress is more released and dispersed to the inner side, and the outer sealing part is more avoided from being affected by the stress to abnormally seal, so as to ensure the pressing sealing effect between the outer sealing part and the valve body.

[0016] In the diaphragm valve, the top of the body is further provided with an annular supporting protrusion, the annular supporting protrusion is arranged around the annular sealing protrusion, and an annular accommodating groove is formed between the annular sealing protrusion and the annular supporting protrusion, and the outer sealing part is arranged in interference fit with the annular accommodating groove. The valve body is in interference fit with the annular accommodating groove, so that the inner side surface and the outer side surface of the outer sealing part are both sealed with the valve body, so as to further improve the sealing effect between the outer sealing part and the valve body; and when the annular pressing surface presses the outer sealing part, the bottom end of the outer sealing part can be sealed and abutted with the bottom wall of the annular accommodating groove, and when the outer sealing part is deformed under pressure, the interference amount between the side wall of the outer sealing part and the annular accommodating groove is further increased, so as to further improve the sealing effect between the outer sealing part and the annular accommodating groove.

[0017] In the diaphragm valve, the deformation part is connected with the inner sealing part, the bottom of the inner sealing part is provided with an inclined surface extending to the deformation part, and the inclined surface gradually increases from the outer circumferential side of the inner sealing part to the central axis direction of the inner sealing part, so as to be inclined to the valve core. By arranging the bottom end of the inner sealing part as an inclined surface inclined to the valve core, the stress concentration at the bending part of the deformation part can be reduced when the diaphragm valve is opened, so as to improve the service life of the deformation part.

[0018] The characteristics and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described below in combination with the drawings and specific embodiments:

[0020] Figure 1 It is the sectional view schematic diagram of diaphragm valve in example one;

[0021] Figure 2 It is Figure 1 The enlarged view of A part;

[0022] Figure 3 It is the sectional view schematic diagram of valve core, deformation part and sealing part in example one;

[0023] Figure 4 It is the partial sectional view schematic diagram of valve shell in example one;

[0024] Figure 5 It is the sectional view schematic diagram of valve main body in example one;

[0025] Figure 6 It is the sectional view schematic diagram of diaphragm valve in example two.

[0026] Reference signs:

[0027] 100, valve main body; 110, body; 111, liquid inlet channel; 112, liquid outlet channel; 113, valve cavity; 120, annular sealing protrusion; 130, annular supporting protrusion; 140, annular accommodating groove;

[0028] 200, valve assembly;

[0029] 300, valve core;

[0030] 400, deformation part;

[0031] 500, sealing part; 510, inner sealing part; 520, fixed part; 530, outer sealing part; 540, annular sealing groove; 550, inclined surface;

[0032] 600, valve shell; 610, annular limiting surface; 620, abutting part; 630, annular pressing surface; 640, annular groove; 650, shell; 660, supporting piece; 670, connecting body; 680, cover;

[0033] 700, driving structure. Specific embodiments

[0034] The utility model provides a diaphragm valve, including, valve main body has the liquid inlet flow channel, liquid outlet flow channel and valve chamber for fluid to pass through, and valve chamber and liquid inlet flow channel and liquid outlet flow channel intercommunication arrangement, valve assembly includes valve core, the deformation part of being located valve core peripheral side and the sealing part of being arranged at the deformation part peripheral side, and valve core changes the fluid state in valve chamber through axial movement, valve shell body is connected to valve main body upper end, to with valve main body common clamping sealing part, sealing part includes inner sealing part and the fixed part of setting up around inner sealing part, and inner sealing part extends axially, and seals and abuts on the inboard wall of valve main body, and the fixed part is connected in the top of inner sealing part and extends radially to be clamped between valve shell body and valve main body, the utility model discloses the structure that sealing part is set into inner sealing part and the fixed part combination, when the fixed part of extending along valve assembly radially is clamped between valve main body and valve shell body, the inner sealing part of the inner ring of fixed part bottom part extends along the axial direction of valve assembly to adhere to the inboard wall of valve main body, when the movement of deformation part leads to the existence of the tiny gap between inner sealing part and the inboard wall of valve main body, even if the fluid carries the particulate matter, because the gap extends along the axial direction of valve assembly and the bottom end opening, so the particulate matter is difficult to enter the gap, even if the particulate matter enters the gap, the particulate matter in the gap is also easy to drop under the action of gravity and fluid, avoid a large number of particulate matter to accumulate between sealing part and valve main body and cause the pollution of fluid, guarantee the cleanliness of fluid.

[0035] Further can make the primary seal between inner sealing part and the inboard wall of valve main body, the secondary seal between fixed part and the top surface of valve main body, the primary seal and secondary seal realize the simultaneous sealing between sealing part and the inboard wall and top surface of valve main body, increase the sealing reliability between sealing part and valve main body, prevent fluid from leaking.

[0036] The technical scheme of the utility model embodiment will be explained and described below in combination with the drawings of the utility model embodiment, but the following embodiment is only the preferred embodiment of the utility model, and not all. Based on the embodiment in the embodiment, other embodiments obtained by the person skilled in the art without creative labor all belong to the protection scope of the utility model.

[0037] In the description of the utility model, it is 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" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as limiting the utility model.

[0038] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the "first" feature is "on" or "under" the "second" feature, which can include direct contact between the first and second features, or it can include indirect contact between the first and second features through another feature between them. Moreover, the "first" feature "on", "above" and "above" the "second" feature includes the first feature above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "first" feature "below", "below" and "below" the "second" feature includes the first feature below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] Embodiment one:

[0042] A diaphragm valve, such as Figures 1 to 5As shown, the valve includes a valve body 100, a valve assembly 200 and a valve housing 600, the valve body 100 has a liquid inlet flow channel 111, a liquid outlet flow channel 112 and a valve cavity 113 inside for fluid to pass through, the valve assembly 200 includes a valve core 300, a deformation part 400 connected to the outer peripheral side of the valve core 300 and a sealing part 500 arranged on the outer peripheral side of the deformation part 400, the valve housing 600 is connected to the upper end of the valve body 100 to clamp the sealing part 500 together with the valve body 100 so that the valve assembly 200 seals the top of the valve cavity 113, and the valve core 300 can change the fluid state in the valve cavity 113 by moving in the axial direction. The valve assembly 200 further includes a driving structure 700 connected to the valve core 300, which is located inside the valve housing 600 to drive the valve core 300 to move; or a gas cavity is arranged at the top end of the valve core 300 and the deformation part 400, and the movement of the valve core 300 is controlled by controlling the pressure in the gas cavity.

[0043] The diaphragm valve can be used as an on-off valve, the valve body 100 is provided with a valve seat communicating the liquid inlet flow channel 111 and the liquid outlet flow channel 112, and the valve seat is opened or closed by the axial movement of the valve core 300 to realize the on-off of the fluid in the diaphragm valve; or the diaphragm valve is used as a regulating valve, the valve body 100 is provided with a valve seat communicating the liquid inlet flow channel 111 and the liquid outlet flow channel 112, and the opening degree of the valve seat is changed by the valve core to realize the regulation of the flow or pressure of the fluid in the diaphragm valve; or the diaphragm valve is used as a back suction valve, the movement of the valve core and the deformation part realizes the back suction of the fluid in the valve body 100 to avoid the situation that liquid droplets fall.

[0044] As shown in Figure 1 and Figure 2 The sealing part 500 includes an inner sealing part 510 and a fixing part 520, the inner sealing part 510 extends in the axial direction of the valve assembly 200 and seals against the inner side wall of the valve body 100, and the fixing part 520 is arranged around the inner sealing part 510, connected to the top of the inner sealing part 510 and extends outward in the radial direction of the valve assembly 200 to be clamped between the valve housing 600 and the valve body 100. It should be noted that the aforementioned axial extension is in the up-down direction of the valve assembly 200, and the aforementioned radial extension is horizontally extended away from the central axis of the valve core 300. Figure 1 Figure 1

[0045] ​​The utility model discloses a sealing part 500 is set to the structure that inner sealing part 510 and fixed part 520 combine, can realize through inner sealing part 510 play the effect of sealing, realize sealing part 500 through fixed part 520 between valve main body 100 and valve housing 600 between fixed, avoid sealing part 500 and valve housing 600 between valve main body 100 and the separation of, can guarantee inner sealing part 510 and valve main body 100 between keeping sealed simultaneously, avoid the problem that inner sealing part 510 and fixed part 520 whole inward deviation leads to the sealing failure of inner sealing part 510 place.

[0046] When the deformation part 400 is affected by fluid pressure fluctuation or the movement of the valve core 300, a small gap is generated between the inner sealing part 510 and the valve main body 100. Since the gap is axially extended and downwardly open, even if the fluid carries particles, the particles are difficult to enter the gap. Even if the particles enter the gap, they are easily dropped from the gap under the influence of fluid fluctuation and their own gravity, so that the accumulation of a large amount of particles between the sealing part 500 and the valve main body 100 to cause fluid pollution can be avoided, and the cleanliness of the fluid can be ensured.

[0047] Further, a primary seal can be formed between the inner sealing part 510 and the inner side wall of the valve main body 100, and a secondary seal can be formed between the fixed part 520 and the top surface of the valve main body 100. The primary seal and the secondary seal realize simultaneous sealing between the sealing part 500 and the inner side wall and the top surface of the valve main body 100, thereby enhancing the sealing reliability between the sealing part 500 and the valve main body 100 and preventing fluid leakage.

[0048] Referring to Figure 1 Because the valve housing 600 and the valve main body 100 jointly clamp the fixed part 520, when the fixed part 520 is pressed and deformed and the fluid impacts the inner sealing part 510 upwardly, the inner sealing part 510 and the part of the fixed part 520 located directly above the inner sealing part 510 are prone to warp upwardly, resulting in sealing failure between the inner sealing part 510 and the valve main body 100. Therefore, referring to Figure 2 The present embodiment sets an annular limiting surface 610 at the bottom end of the valve housing 600, and the annular limiting surface 610 is arranged directly above the inner sealing part 510. The annular limiting surface 610 can press the inner sealing part 510 through the fixed part 520 to limit excessive deformation of the fixed part 520 and the inner sealing part 510 upwardly, so as to ensure that the inner sealing part 510 is always closely attached to the inner side wall of the valve main body 100, thereby ensuring the sealing effect between the inner sealing part 510 and the valve main body 100.

[0049] Referring to Figure 2Meanwhile, the valve housing 600 is also provided with an abutting portion 620, which is located at the inner side of the inner sealing portion 510 (i.e. the inner ring of the inner sealing portion 510). The inner sealing portion 510 is pressed between the abutting portion 620 and the valve body 100, so as to limit the inner sealing portion 510 in the horizontal direction by the abutting portion 620, prevent the inner sealing portion 510 from deforming away from the inner side wall of the valve body 100 and separating from the inner side wall of the valve body 100, and ensure the stable sealing between the inner sealing portion 510 and the inner side wall of the valve body 100. The aforementioned inner sealing portion 510 pressed between the abutting portion 620 and the valve body 100 can have a thickness equal to the distance between the outer side wall of the abutting portion 620 and the inner side wall of the valve body 100, or the thickness of the inner sealing portion 510 can be greater than the distance between the outer side wall of the abutting portion 620 and the inner side wall of the valve body 100, so that the inner sealing portion 510 is in interference fit between the outer side wall of the abutting portion 620 and the inner side wall of the valve body 100.

[0050] It can be understood that the valve housing 600 is simultaneously provided with the annular limiting surface 610 and the abutting portion 620, which is the preferred embodiment of the present embodiment, and the valve housing can be provided with only the annular limiting surface or the abutting portion.

[0051] The inner side wall of the valve body 100 in the present embodiment is a vertical surface, i.e. the inner side wall of the valve body 100 extends in the vertical direction, and the inner sealing portion 510 extends only in the axial direction of the valve assembly 200, i.e. in the vertical direction, and the extending directions of the two are the same, so that the inner sealing portion 510 is closely fitted with the inner side wall of the valve body 100, and the assembly of the valve assembly 200 and the valve body 100 is facilitated. Of course, in another embodiment, at least one of the valve body and the inner sealing portion has an inclined side wall, which extends in another direction from top to bottom, including the following cases:

[0052] Case one, the two opposite side walls of the valve body and the inner sealing portion are inclined to be arranged in the same direction, and the inclination angles of the two are the same, so that the inner sealing portion is closely fitted with the inner side wall of the valve body during assembly;

[0053] Case two, the inner sealing portion extends vertically in the axial direction of the valve assembly, and the inner side wall of the valve body is inclined to the inner sealing portion, so that during assembly, the inner side wall of the valve body presses the inner sealing portion in the direction of the central axis of the valve assembly, so that the elastically deformed inner sealing portion is closely fitted on the inner side wall of the valve body;

[0054] Case three, the inner side wall of the valve body extends vertically in the axial direction of the valve assembly, and the inner sealing portion is inclined toward the inner side wall of the valve body. During assembly, the inclined surface of the inner sealing portion (i.e. the side surface of the inner sealing portion facing the valve body) is blocked by the inner side wall of the valve body, so that the inner sealing portion is elastically deformed, so that the inner sealing portion is closely fitted on the inner side wall of the valve body.

[0055] In the embodiment, as shown in Figure 2 The sealing part 500 further comprises an outer sealing part 530 connected to the bottom of the outer circumferential side of the fixing part 520 and extending along the axial direction of the valve assembly 200, so that the outer sealing part 530 seals the outer side of the inner sealing part 510 and seals against the valve body 100, achieving the sealing between the outer sealing part 530 and the valve body 100.

[0056] The arrangement of the outer sealing part 530 further enhances the sealing reliability between the sealing part 500 and the valve body 100, that is, even if the sealing between the inner sealing part 510 and the fixing part 520 and the valve body 100 fails, the sealing between the sealing part 500 and the valve body 100 can be ensured by the outer sealing part 530.

[0057] Referring to Figure 5 , the valve body 100 in the embodiment comprises a body 110 and an annular sealing protrusion 120 fixed on the body 110, referring to Figure 3 , the fixing part 520, the inner sealing part 510 connected to the bottom of the inner circumferential side of the fixing part 520, and the outer sealing part 530 connected to the bottom of the outer circumferential side of the fixing part 520 jointly form an annular sealing groove 540, which is arranged with an opening downward, and when the sealing part 500 is not assembled with the valve body 100, the width D1 of the annular sealing groove 540 is smaller than the thickness D2 of the annular sealing protrusion 120, and when the sealing part 500 is assembled with the valve body 100, the annular sealing protrusion 120 is inserted into the annular sealing groove 540 and is in interference fit with the annular sealing groove 540, so that the inner sealing part 510 is sealed and abuts against the inner side wall of the annular sealing protrusion 120, and the outer sealing part 530 is sealed and abuts against the outer side wall of the annular sealing protrusion 120, achieving the sealed connection of the two with the annular sealing protrusion 120 and improving the sealing effect between the sealing part 500 and the valve body 100. Of course, during installation, the fixing part 520 can also be sealed and abutted against the top end of the annular sealing protrusion 120, so as to further improve the sealing reliability of the structure.

[0058] As shown in Figure 1 , the valve housing 600 in the embodiment comprises a shell 650 locked with the valve body 100 and a support 660 arranged at the bottom of the shell 650, and the support 660 and the shell 650 are arranged separately, and the annular crimping surface 630 is arranged at the lowest position of the bottom end of the support 660.

[0059] During diaphragm valve assembly, support member 660 is positioned above valve assembly 200, and annular pressing surface 630 is positioned directly above outer sealing part 530. Under the push of housing 650, the annular pressing surface 630 of support member 660 presses down on the top surface of fixing part 520, so as to press outer sealing part 530 down through fixing part 520 to press outer sealing part 530 onto valve body 100, thereby ensuring the seal between outer sealing part 530 and valve body 100.

[0060] The annular pressing surface 630 is located at the lowest point of the bottom of the support member 600, which ensures that the outer sealing part 530 receives the maximum pressing force when the valve body 600 and the valve body 100 are installed, thereby ensuring the best sealing effect at the outer sealing part 530. This allows the outer sealing part 530 to play the main sealing role, and even if the inner sealing part 510 fails to seal, there will be no leakage between the valve assembly 200 and the valve body 100.

[0061] It should be noted that the "bottom end of support member 600" in the aforementioned "the lowest point of the bottom end of support member 660 is provided with an annular pressing surface 630" refers to the part located at the bottom end of support member 600 and opposite to the top end of fixing part 520, and does not include the part located on the radial inner and / or outer side of fixing part 520.

[0062] It should be noted that because the sealing part 500 is connected to the deformable part 400, when the deformable part 400 moves up and down and deforms with the valve core 300, the inner sealing part 510 may undergo slight deformation, thereby affecting the sealing effect between the inner sealing part 510 and the valve body 100. Therefore, the inner sealing part 510 may not provide the primary sealing effect. The aforementioned annular pressing surface 630 ensures a sufficient sealing effect between the sealing part 500 and the valve body 100, allowing the outer sealing part 530 to provide the primary sealing effect. This ensures better sealing reliability of this design in actual use.

[0063] like Figure 2 As shown in Figure 4, an annular limiting surface 610 coaxial with the annular pressing surface 630 is also provided at the bottom end of the valve body 600. The annular limiting surface 610 is located inside the annular pressing surface 630 so that the annular limiting surface 610 is directly above the inner sealing part 510. The annular limiting surface 610 limits the inner sealing part 510 below through the fixing part 520. When the annular pressing surface 630 applies pressure to the outer sealing part 530 through the fixing part 520, the annular limiting surface 610 can restrict the inner ring of the fixing part 520 from warping upward, thereby restricting the inner sealing part 510 from excessively deforming upward with the fixing part 520, ensuring stable contact and sealing between the inner sealing part 510 and the annular sealing protrusion 120. In this embodiment, an annular groove 640 with an opening facing downward is provided at the bottom end of the support member 660. The annular groove 640 is located between the annular limiting surface 610 and the annular pressing surface 630.

[0064] In the case that the inner sealing part 510 is pressed by the annular limiting surface 610 and the outer sealing part 530 is pressed by the annular pressing surface 630, stress will be concentrated at the connection between the fixing part 520 and the outer sealing part 530 and the connection between the fixing part 520 and the inner sealing part 510 when the sealing part 500 is pressed, and the structure of the connection will be abnormally deformed, which will affect the sealing effect between the outer sealing part 530 and the annular sealing protrusion 120 and the sealing effect between the inner sealing part 510 and the annular sealing protrusion 120.

[0065] However, by arranging the annular groove 640, the fixing part 520 will be deformed and protrude into the annular groove 640 due to the aforementioned stress during installation, and the aforementioned stress is absorbed, released or dispersed through the deformation, so as to avoid affecting the sealing effect between the inner sealing part 510 and the annular sealing protrusion 120 and the sealing effect between the outer sealing part 530 and the annular sealing protrusion 120.

[0066] It should be noted that, as shown in Figure 2 the annular groove 640 is arranged between the annular limiting surface 610 and the annular pressing surface 630, the annular limiting surface 610 is opposite to the inner sealing part 510, the annular pressing surface 630 is opposite to the outer sealing part 530, and the sealing part 500 only has the fixing part 520 between the inner sealing part 510 and the outer sealing part 530, the structure of which is relatively thin and is relatively easy to deform, that is, the structure can be deformed into the annular groove 640 under the action of stress, so as to better absorb, release or disperse the aforementioned stress.

[0067] It should be noted that, Figure 1 and Figure 2 are schematic diagrams of the preliminary assembly of various structures in the diaphragm valve, and are not state diagrams when the valve body 100 and the valve housing 600 are installed and locked, that is, the state in which the fixing part 520 is deformed upward is not shown in the diagrams. In addition, the bottom end of the fixing part 520 can have a gap with the top end of the annular sealing protrusion 120 when locked, as shown in Figure 2 , or the bottom end of the fixing part 520 can be locally sealed with the top end of the annular sealing protrusion 120.

[0068] As shown in Figure 2 , in the present embodiment, the annular groove 640 is arranged closer to the inner sealing part 510, that is, the distance between the center of the annular groove 640 and the outer side wall of the inner sealing part 510 in the horizontal direction is less than the distance between the center of the annular groove 640 and the inner side wall of the outer sealing part 530 in the horizontal direction, so that the stress is more released and dispersed towards the inner side, and the deformation of the fixing part 520 into the annular groove 640 does not affect the sealing between the outer sealing part 530 and the valve body 100.

[0069] AsFigure 5 As shown, preferably, the top of the body 110 is further provided with an annular support protrusion 130, which is arranged around the annular sealing protrusion 120, and an annular accommodating groove 140 is formed between the annular sealing protrusion 120 and the annular support protrusion 130, as shown. Figure 2 As shown, the outer sealing part 530 is inserted into the annular accommodating groove 140 and arranged in interference fit with the annular accommodating groove 140. The valve body 100 is in interference fit with the annular accommodating groove 140, which ensures that the inner side surface and the outer side surface of the outer sealing part 530 are both sealed with the valve body 100. That is, the annular support protrusion 130 in interference fit with the annular accommodating groove 140 enhances the sealing reliability between the valve body 100 and the outer sealing part 530, and further effectively prevents fluid from leaking between the sealing part 500 and the valve body 100.

[0070] As shown, Figure 2 In the present embodiment, the deformation part 400 is connected to one side of the lower part of the inner sealing part 510, and an inclined surface 550 is arranged at the bottom of the inner sealing part 510, which extends to the deformation part 400, and the height of the inclined surface 550 gradually increases from the outer circumferential side of the inner sealing part 510 to the central axis direction of the inner sealing part 510, so that the inclined surface 550 is arranged to be inclined towards the valve core 300. By arranging the bottom end of the inner sealing part 510 as the inclined surface 550 inclined towards the valve core 300, the stress concentration at the bending part of the deformation part 400 can be reduced when the diaphragm valve is opened, thereby improving the service life of the deformation part 400.

[0071] Embodiment two:

[0072] The difference between the present embodiment and the first embodiment is that:

[0073] As shown, Figure 6 In the present embodiment, the valve housing 600 includes a cover body 680 and a connecting body 670, and the connecting body 670 is provided with an opening at the top end, which is used to install the driving structure 700, and the opening is closed by the cover body 680.

[0074] Among them, the annular limiting surface 610, the annular groove 640 and the annular crimping surface 630 are all arranged at the bottom end of the connecting body 670 opposite to the fixed part 520.

[0075] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solutions falling within the concept of the present application shall be considered as falling within the protection scope of the present application. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. A diaphragm valve, comprising: The valve body has an inlet channel, an outlet channel, and a valve chamber for fluid to pass through, wherein the valve chamber is connected to the inlet channel and the outlet channel; A valve assembly includes a valve core, a deformation portion located on the outer periphery of the valve core, and a sealing portion located on the outer periphery of the deformation portion. The valve core changes the fluid state within the valve chamber by moving axially. A valve housing is connected to the upper end of the valve body to clamp the sealing part together with the valve body; Its features are, The sealing portion includes an inner sealing portion and a fixing portion disposed around the inner sealing portion. The inner sealing portion extends axially and seals against the inner sidewall of the valve body. The fixing portion is connected to the top of the inner sealing portion and extends radially to be clamped between the valve housing and the valve body.

2. A diaphragm valve according to claim 1, characterized in that: The bottom end of the valve body is provided with an annular limiting surface located directly above the inner sealing part, and the annular limiting surface applies pressure to the inner sealing part through the fixing part; And / or, the valve housing is provided with an abutment portion located inside the inner sealing portion, the inner sealing portion being pressed between the abutment portion and the valve body.

3. A diaphragm valve according to claim 1, characterized in that: The inner wall of the valve body is a vertical surface, and the inner sealing part extends only axially to fit against the inner wall of the valve body. Alternatively, at least one of the valve body and the inner seal has an inclined sidewall that extends from top to bottom in another direction.

4. A diaphragm valve according to claim 2, characterized in that, The sealing part also includes an outer sealing part that seals against the valve body. The outer sealing part is located outside the inner sealing part and connected to the bottom of the fixing part.

5. A diaphragm valve according to claim 4, characterized in that: The outer sealing part, the inner sealing part, and the fixing part together form an annular sealing groove. The valve body includes a body and an annular sealing protrusion, and the annular sealing protrusion is configured to fit the annular sealing groove with an interference seal.

6. A diaphragm valve according to claim 4, characterized in that: The bottom end of the valve body has a low-profile annular pressing surface, which is located directly above the outer sealing part and is pressed against the outer sealing part by a fixing part.

7. A diaphragm valve according to claim 6, characterized in that: The bottom end of the valve body is provided with an annular limiting surface located directly above the inner sealing part. The annular limiting surface applies pressure to the inner sealing part through the fixing part. The bottom end of the valve body is provided with an annular groove between the annular limiting surface and the annular pressing surface. The fixing part can deform toward the annular groove.

8. A diaphragm valve according to claim 7, characterized in that: The annular limiting surface is positioned higher than the annular pressing surface; and / or, the annular groove is positioned close to the inner sealing portion.

9. A diaphragm valve according to claim 5, characterized in that: The top of the main body is also provided with an annular support protrusion, which surrounds the annular sealing protrusion and forms an annular receiving groove between the annular sealing protrusion and the annular support protrusion. The outer sealing part is interference-fitted with the annular receiving groove.

10. A diaphragm valve according to claim 1, characterized in that: The deformable part is connected to the inner sealing part. The bottom of the inner sealing part is provided with an inclined surface extending to the deformable part. The inclined surface gradually increases from the outer periphery of the inner sealing part toward the central axis of the inner sealing part, so that the inclined surface is inclined toward the valve core.

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