A negative pressure fluid control valve

Abstract

The present invention discloses a negative pressure fluid control valve, which includes a valve cover, a valve body, and a valve seat connected in sequence from top to bottom, as well as a negative pressure diaphragm assembly and a fluid sealing diaphragm assembly disposed in the valve body; the negative pressure diaphragm assembly includes a negative pressure diaphragm and a core one, and the fluid sealing diaphragm assembly includes a sealing diaphragm and a core two; if negative pressure is introduced into the negative pressure chamber, the fluid positive pressure chamber and the fluid discharge chamber are in communication; during use, if normal pressure air is introduced into the negative pressure chamber, the fluid positive pressure chamber and the fluid discharge chamber are in an open circuit; in the absence of power, it can rely on negative pressure as the power to play the role of switching the fluid on and off, and is applied to the field of vacuum sewage discharge. It can be used in combination with an electromagnetic three-way valve or a mechanical three-way valve, with low cost and strong practicability, and can effectively contribute to the improvement and development of the vacuum sewage discharge system.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control valves, and particularly relates to a negative pressure fluid control valve. Background Art

[0002] A fluid control valve is a device for switching the fluid flow direction. Commonly used fluid control valves are generally driven by electromagnetic force or compressed air. Among them, a fluid control valve driven by electromagnetic force generally has a rubber sealing surface provided on the fluid channel cross-section, and the rubber sealing surface is driven by electromagnetic force to play the role of switching on and off the fluid; a fluid control valve driven by compressed air generally has a rubber sealing surface provided on the fluid channel cross-section, and the rubber sealing surface is connected to a piston, and the piston is pushed by compressed air, and a fluid control valve driven by compressed air is often used in combination with an electromagnetic valve for switching on and off compressed air.

[0003] At present, a vacuum sewage drainage system mainly for collecting waste sewage has been widely used in the fields of subways, rural areas, tourist attractions, commercial development, etc. in China. However, the fluid control valves used in it are still driven by electromagnetic force or compressed air. In the absence of power, positive pressure must still be used for the toilet to flush, and the negative pressure of the vacuum system is not utilized. This not only makes the system more complex, but also adds compressed air pipelines, resulting in higher costs.

[0004] Therefore, there is an urgent need in the market for a negative pressure-driven fluid control valve to improve the vacuum sewage drainage system. Summary of the Invention

[0005] In view of the defects in the prior art, the present invention provides a negative pressure fluid control valve that can rely on negative pressure as power to play the role of switching on and off the fluid.

[0006] The technical solution of the present invention is specifically as follows:

[0007] A negative pressure fluid control valve includes a valve cover, a valve body, a valve seat connected in sequence from top to bottom, and a negative pressure diaphragm assembly and a fluid sealing diaphragm assembly disposed in the valve body; the negative pressure diaphragm assembly includes a negative pressure diaphragm and a core one, and the fluid sealing diaphragm assembly includes a sealing diaphragm and a core two; wherein:

[0008] A partition is provided in the middle of the valve body, and the partition is used to divide the inner cavity of the valve body into upper and lower parts;

[0009] The negative pressure diaphragm divides the inner cavity formed by the partition and the valve cover into a negative pressure chamber above the negative pressure diaphragm and an atmospheric pressure chamber below the negative pressure diaphragm; the negative pressure chamber is used to connect to a negative pressure generating device, and a vent hole communicating with the outside of the valve body is provided on the atmospheric pressure chamber;

[0010] The valve seat has a three-way structure, including a fluid inlet, a fluid outlet, and a negative pressure acting port. A boss is provided at the upper edge of the negative pressure acting port.

[0011] The seal diaphragm assembly divides the inner cavity formed by the separator and the valve seat into a pilot cavity above the seal diaphragm, a fluid positive pressure cavity below the seal diaphragm and communicating with the fluid inlet, and a fluid discharge cavity below the seal diaphragm and communicating with the fluid outlet. A through hole one is provided on the seal diaphragm, and the through hole one is used to communicate the pilot cavity and the fluid positive pressure cavity.

[0012] The upper part of the core one is fixed to the negative pressure diaphragm, the lower part penetrates through the separator and extends into the pilot cavity. A spring is sleeved outside the lower end of the core one, and a seal is provided at the bottom. The core two is arranged below the core one, penetrates through the seal diaphragm from the pilot cavity and extends into the negative pressure acting port of the valve seat. A through hole two is provided at the central position of the core two, and the through hole two can be used to communicate the pilot cavity and the fluid discharge cavity. The aperture of the through hole one is smaller than that of the through hole two.

[0013] When the negative pressure fluid control valve is in the closed state, under the action of the spring, the seal diaphragm abuts against the boss, and the fluid positive pressure cavity is disconnected from the fluid discharge cavity. When the negative pressure fluid control valve is in the open state, the seal diaphragm is separated from the boss, and the fluid positive pressure cavity is communicated with the fluid discharge cavity.

[0014] Preferably, the valve cover and the valve body are engaged with each other and clamp the negative pressure diaphragm therebetween. A locking nut is also provided outside the valve body and the valve cover to further stabilize their connection.

[0015] Preferably, a threaded portion is provided at the top end of the core one. A gasket - negative pressure diaphragm - gasket are sequentially sleeved on the threaded portion from top to bottom. A limit nut is also provided at the top end of the threaded portion and is threadedly connected thereto. The limit nut is used to limit the negative pressure diaphragm and the two gaskets at the top of the core one.

[0016] Preferably, the separator is in an inverted bowl shape, including a bowl foot portion with a smaller inner diameter at the upper part and a bowl body portion with a gradually increasing inner diameter at the lower part. The bowl foot portion is communicated with the bowl body portion. The core one penetrates through the bowl foot portion and extends into the bowl body portion. A sealing ring and a set ring are sequentially sleeved on the core one from top to bottom in the bowl foot portion.

[0017] Preferably, the spring is arranged below the set ring. The lower end of the core one is in an inverted T shape to limit the spring. A hollow column is provided on the bottom surface of the core one. The seal covers the bottom surface of the core one and extends into the hollow column.

[0018] Preferably, both the seal and the sealing ring are made of rubber.

[0019] Preferably, a negative pressure inlet is provided on the upper surface of the valve cover, and the negative pressure inlet is communicated with the negative pressure chamber.

[0020] Preferably, the valve body, the first core, the second core, the second through hole, the boss and the negative pressure inlet are coaxially arranged.

[0021] The beneficial effects of the present invention are embodied in:

[0022] The negative pressure fluid control valve provided by the present invention is a truly negative pressure-driven fluid control valve. If negative pressure is introduced into the negative pressure chamber, the passages of the fluid positive pressure chamber and the fluid discharge chamber are opened; if normal pressure air is introduced into the negative pressure chamber, the passages of the fluid positive pressure chamber and the fluid discharge chamber are blocked; in the absence of power, it can rely on negative pressure as the power to open and close the fluid, and is applied to the field of vacuum sewage discharge. It can be used in combination with an electromagnetic three-way valve or a mechanical three-way valve, with low cost and strong practicability, and can effectively contribute to the improvement and development of the vacuum sewage discharge system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1 FIG. 1 is a schematic structural diagram of the negative pressure fluid control valve provided by the present invention;

[0025] Figure 2 FIG. Figure 1 2 is a cross-sectional view of the negative pressure fluid control valve shown (closed state);

[0026] Figure 3 FIG. Figure 1 3 is a cross-sectional view of the negative pressure fluid control valve shown (open state);

[0027] Figure 4 FIG. Figure 2 4 is a schematic structural diagram of the seal diaphragm assembly of the negative pressure fluid control valve shown.

[0028] In the drawings, 1-fluid positive pressure chamber, 2-valve seat, 201-boss, 3-fluid discharge chamber, 4-second core, 401-second through hole, 5-seal diaphragm, 501-first through hole, 6-spring, 7-pilot chamber, 8-valve body, 801-air vent hole, 9-normal pressure chamber, 10-lock nut, 11-negative pressure chamber, 12-valve cover, 13-limit nut, 14-gasket, 15-negative pressure diaphragm, 16-first core, 17-sealing ring, 18-set ring, 19-sealing member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described herein.

[0031] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0032] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0033] In addition, terms such as "arranged", "provided with", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In addition, the meaning of the term "plurality" should be two or more.

[0035] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine the embodiments to detail this application.

[0036] This embodiment provides a negative pressure fluid control valve, such as Figures 1 to 4As shown in the figure, it includes a valve cover 12, a valve body 8, a valve seat 2 connected in sequence from top to bottom, and a negative pressure diaphragm 15 assembly and a fluid sealing diaphragm 5 assembly arranged in the valve body 8; the negative pressure diaphragm 15 assembly includes a negative pressure diaphragm 15 and a core 16, and the fluid sealing diaphragm 5 assembly includes a sealing diaphragm 5 and a core 4; wherein:

[0037] The valve cover 12 and the valve body 8 are engaged with each other and clamp the negative pressure diaphragm 15 therebetween. A locking nut 10 is also provided outside the valve body 8 and the valve cover 12 to further stabilize their connection;

[0038] A separator is provided in the middle of the valve body 8, and the separator is used to divide the inner cavity of the valve body 8 into upper and lower parts;

[0039] The negative pressure diaphragm 15 divides the inner cavity formed by the separator and the valve cover 12 into a negative pressure chamber 11 above the negative pressure diaphragm 15 and an atmospheric pressure chamber 9 below the negative pressure diaphragm 15; the negative pressure chamber 11 is used to connect to a negative pressure generating device, and a negative pressure inlet is provided on the upper surface of the valve cover 12, and the negative pressure inlet is communicated with the negative pressure chamber 11; an air vent 801 communicating with the outside of the valve body 8 is provided on the atmospheric pressure chamber 9, and the air vent 801 serves to maintain the atmospheric pressure state in the atmospheric pressure chamber 9; the separator is in an inverted bowl shape, including a bowl foot part with a smaller inner diameter in the upper part and a bowl body part with a gradually increasing inner diameter in the lower part, and the bowl foot part is communicated with the bowl body part;

[0040] The valve seat 2 is a three-way structure, including a fluid inlet, a fluid outlet, and a negative pressure acting port. Among them, the negative pressure acting port opens upward, and a convex platform 201 is provided on the upper edge, and the top surface of the convex platform 201 is rounded;

[0041] The sealing diaphragm 5 assembly divides the inner cavity formed by the separator and the valve seat 2 into a pilot chamber 7 above the sealing diaphragm 5, a fluid positive pressure chamber 1 below the sealing diaphragm 5 and communicating with the fluid inlet, and a fluid discharge chamber 3 below the sealing diaphragm 5 and communicating with the fluid outlet; a through hole 501 is provided on the sealing diaphragm 5, and the through hole 501 is used to communicate the pilot chamber 7 with the fluid positive pressure chamber 1;

[0042] The upper part of the first core 16 is fixed to the negative pressure diaphragm 15, and the lower part penetrates through the separator and extends into the pilot chamber 7. A spring 6 is sleeved outside the lower end of the first core 16, and a seal 19 is arranged at the bottom. A threaded part is provided at the top of the first core 16. A gasket 14 - negative pressure diaphragm 15 - gasket 14 are sequentially sleeved on the threaded part from top to bottom. A limit nut 13 is also provided at the top of the threaded part and is threadedly connected thereto. The limit nut 13 can be used to limit the negative pressure diaphragm 15 and the two gaskets 14 to the top of the first core 16, so that the negative pressure diaphragm 15 can drive the first core 16 to move. The first core 16 penetrates through the bowl foot part and extends into the bowl body part. A sealing ring 17 and a set ring 18 are sequentially sleeved on the first core 16 from top to bottom in the bowl foot part. The spring 6 is arranged below the set ring 18. The lower end of the first core 16 is T-shaped to limit the spring 6. A hollow column is opened on the bottom surface of the first core 16, and the seal 19 covers the bottom surface of the first core 16 and extends into the hollow column.

[0043] The second core 4 is arranged below the first core 16 and extends from the pilot chamber 7 through the sealing diaphragm 5 into the negative pressure port of the valve seat 2. A through hole 401 is opened at the central position of the second core 4, and the through hole 401 can be used to communicate the pilot chamber 7 with the fluid discharge chamber 3. The aperture of the through hole 501 is smaller than that of the through hole 401.

[0044] It should be noted that the valve body 8, the first core 16, the second core 4, the through hole 401, the boss 201 and the negative pressure inlet are preferably coaxially arranged. The seal 19 and the sealing ring 17 can be made of rubber.

[0045] The working principle of this embodiment:

[0046] When the negative pressure fluid control valve is in the closed state, as Figure 2 shown, the negative pressure chamber 11 is in the normal pressure state. At this time, the pressure of the normal pressure chamber 9 is the same as that of the negative pressure chamber 11. The first core 16 only receives the downward acting force of the spring 6. The seal 19 at the bottom of the first core 16 presses on the second core 4 under the action of the spring 6, resulting in the interruption of the through hole 401. Since the pilot chamber 7 is communicated with the fluid positive pressure chamber 1 through the through hole 501 on the sealing diaphragm 5, the fluid pressures in the pilot chamber 7 and the fluid positive pressure chamber 1 are equal. In addition, since the contact area between the pilot chamber 7 and the fluid sealing diaphragm 5 assembly is larger than the contact area between the fluid positive pressure chamber 1 and the fluid sealing diaphragm 5 assembly, the downward pressure acting force on the fluid sealing diaphragm 5 assembly is greater than the upward pressure acting force, so that the sealing diaphragm 5 finally adheres to the boss 201 in the middle of the valve seat 2 under the combined action of the spring 6 acting force and the pressure acting force, thereby interrupting the fluid positive pressure chamber 1 and the fluid discharge chamber 3.

[0047] When the negative pressure fluid control valve is in the open state, as Figure 3As shown, the negative pressure chamber 11 is in a negative pressure state. The upward air pressure on the negative pressure diaphragm 15 assembly is greater than the downward acting force of the spring 6. The seal 19 at the bottom of the first core 16 moves upward, exposing the through hole two 401 to form a passage. The fluid in the pilot chamber 7 is discharged from the fluid discharge chamber 3 through the through hole two 401 under the action of fluid pressure. Since the aperture of the through hole two 401 is larger than that of the through hole one 501, the fluid supplemented through the through hole one 501 is less than the fluid flowing out through the through hole two 401. Therefore, the fluid pressure in the fluid positive pressure chamber 1 gradually becomes greater than the fluid pressure in the pilot chamber 7. When the pressure difference between the two reaches a certain level, the downward pressure acting force on the fluid sealing diaphragm 5 assembly is less than the upward pressure acting force, causing the sealing diaphragm 5 to disengage from the boss 201 in the middle of the valve seat 2, thereby making the passage between the fluid positive pressure chamber 1 and the fluid discharge chamber 3.

[0048] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. A negative pressure fluid control valve, characterized in that: It includes a valve cover, a valve body, a valve seat connected in sequence from top to bottom, and a negative pressure diaphragm assembly and a fluid sealing diaphragm assembly arranged in the valve body; the negative pressure diaphragm assembly includes a negative pressure diaphragm and a core one, and the fluid sealing diaphragm assembly includes a sealing diaphragm and a core two; where: A separator is arranged in the middle of the valve body, and the separator is used to divide the inner cavity of the valve body into upper and lower parts; The negative pressure diaphragm divides the inner cavity formed by the separator and the valve cover into a negative pressure chamber located above the negative pressure diaphragm and an atmospheric pressure chamber located below the negative pressure diaphragm; the negative pressure chamber is used to connect to a negative pressure generating device, and an air vent communicating with the outside of the valve body is opened on the atmospheric pressure chamber; The valve seat is a three-way structure, including a fluid inlet, a fluid outlet, and a negative pressure acting port, and a boss is arranged on the upper edge of the negative pressure acting port; The sealing diaphragm assembly divides the inner cavity formed by the separator and the valve seat into a pilot chamber located above the sealing diaphragm, a fluid positive pressure chamber located below the sealing diaphragm and communicating with the fluid inlet, and a fluid discharge chamber located below the sealing diaphragm and communicating with the fluid outlet; a through hole one is opened on the sealing diaphragm, and the through hole one is used to connect the pilot chamber and the fluid positive pressure chamber; The upper part of the core one is fixed to the negative pressure diaphragm, the lower part penetrates through the separator and extends into the pilot chamber, a spring is sleeved outside the lower end of the core one, and a seal is arranged at the bottom; the core two is arranged below the core one, penetrates through the sealing diaphragm from the pilot chamber and extends into the negative pressure acting port of the valve seat, a through hole two is opened at the central position of the core two, and the through hole two can be used to connect the pilot chamber and the fluid discharge chamber; the aperture of the through hole one is smaller than the aperture of the through hole two; When the negative pressure fluid control valve is in the closed state, under the action of the spring, the sealing diaphragm abuts against the boss, and the fluid positive pressure chamber is disconnected from the fluid discharge chamber; when the negative pressure fluid control valve is in the open state, the sealing diaphragm is separated from the boss, and the fluid positive pressure chamber is communicated with the fluid discharge chamber; The valve cover and the valve body are mutually engaged and clamp the negative pressure diaphragm therebetween, and a locking nut is also arranged outside the valve body and the valve cover for further stabilizing their connection; A threaded portion is arranged at the top end of the core one, a gasket - negative pressure diaphragm - gasket are sequentially sleeved on the threaded portion from top to bottom, and a limit nut threadedly connected thereto is also arranged at the top end of the threaded portion, and the limit nut is used to limit the negative pressure diaphragm and the two gaskets at the top of the core one.

2. The negative pressure fluid control valve according to claim 1, characterized in that: The separator is an inverted bowl shape, including a bowl foot part with a smaller inner diameter at the upper part and a bowl body part with a gradually increasing inner diameter at the lower part, the bowl foot part is communicated with the bowl body part, the core one penetrates through the bowl foot part and extends into the bowl body part, and a sealing ring and a set ring are sequentially sleeved on the core one from top to bottom in the bowl foot part.

3. A negative pressure fluid control valve according to claim 2, characterized in that: The spring is arranged below the set ring, the lower end of the core one is in an inverted T shape to limit the spring, a hollow column is opened on the bottom surface of the core one, and the seal covers the bottom surface of the core one and extends into the hollow column.

4. The negative pressure fluid control valve according to claim 2, characterized in that: Both the seal and the sealing ring are made of rubber material.

5. A negative pressure fluid control valve according to claim 1, characterized in that: A negative pressure connection port is arranged on the upper surface of the valve cover, and the negative pressure connection port is communicated with the negative pressure chamber.

6. The negative pressure fluid control valve according to claim 5, wherein: The valve body, the first core, the second core, the second through hole, the boss and the negative pressure inlet are all coaxially arranged.

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