CN213088793U - Negative pressure valve - Google Patents
Negative pressure valve Download PDFInfo
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- CN213088793U CN213088793U CN202021912268.XU CN202021912268U CN213088793U CN 213088793 U CN213088793 U CN 213088793U CN 202021912268 U CN202021912268 U CN 202021912268U CN 213088793 U CN213088793 U CN 213088793U
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- negative pressure
- valve
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- water inlet
- valve body
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims description 44
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000000746 purification Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- Fluid-Driven Valves (AREA)
- Safety Valves (AREA)
Abstract
The utility model discloses a negative pressure valve, negative pressure valve includes mutual airtight connection's valve body and disk seat, be equipped with the water inlet on the disk seat, be equipped with the delivery port on the valve body, the delivery port has connected gradually diaphragm pump, heating unit, outlet valve, is equipped with the accuse on the water route of water inlet and delivery port intercommunication and flows the subassembly, the step form lantern ring that the valve body constitutes has on the valve body, is equipped with the position lantern ring that comprises the disk seat body on the disk seat, and the step form lantern ring is with the mutual joint of position lantern ring, is equipped with the negative pressure chamber that comprises the valve body between water inlet and the delivery port, and airtight wall is equipped with the atmospheric pressure chamber on the negative pressure chamber, and the accuse flows the subassembly and controls switching on or. The scheme is suitable for the regulation of the water outlet flow of the negative pressure valve by regulating the power of the water supply pump with pressure and without pressure, and the heating effect of the heat supply unit is ensured.
Description
Technical Field
The utility model relates to a fluid delivery technical field, concretely relates to negative pressure valve.
Background
With the development of economy, the trend of water resource condition deterioration appears in many places, the shortage of water resources and pollution become more serious, and the safety problem of drinking water of urban residents is obvious. Aiming at the problem of secondary pollution of urban tap water and harmful substances existing in tap water continuously due to source water pollution, more and more household water purification machines taking reverse osmosis membranes as core filtering units enter thousands of households.
In a general water purification system, a pipe is directly connected to a heating unit, and a water supply pump supplies water to the heating unit. Because the power of the heating unit is fixed, but the water flow entering the heating unit is not controlled, the heating effect is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a negative pressure valve is applicable to and has the pressure and the regulation of the power realization negative pressure valve water flow of non-pressure water source and accessible regulation working shaft, guarantees the heating effect of heat supply unit.
In order to solve the technical problem, the utility model discloses a following scheme:
the utility model provides a negative pressure valve, negative pressure valve includes mutual airtight connection's valve body and disk seat, be equipped with the water inlet on the disk seat, be equipped with the delivery port on the valve body, the delivery port has connected gradually diaphragm pump, heating unit, outlet valve, is equipped with the accuse on the water route of water inlet and delivery port intercommunication and flows the subassembly, the step form lantern ring that the valve body constitutes has on the valve body, is equipped with the position lantern ring that comprises the valve seat body on the disk seat, and the step form lantern ring is connected with the mutual joint of position lantern ring, is equipped with the negative pressure chamber that comprises the valve body between water inlet and the delivery port, and airtight wall is equipped with the atmospheric pressure chamber on the negative pressure chamber, and the accuse flows the.
The related components of the existing water supply pump only have the function of water cut-off and do not have the function of regulating the output flow under the condition of a pressure water source, the scheme is that a negative pressure cavity communicated with a water inlet is arranged in a valve body, when a diaphragm pump does not work, a flow control component controls a water path between the water inlet and a water outlet to be sealed, when the diaphragm pump works, water flow or air in the negative pressure cavity is sucked away to form a certain vacuum degree, at the moment, the flow control component controls the conduction of the water path between the water inlet and the water outlet, the flow after the conduction is related to the negative pressure in the negative pressure cavity, the higher the negative pressure is, the larger the flow after the conduction is, the smaller the negative pressure is, the smaller the flow after the conduction is, and the negative pressure in the negative pressure cavity of the negative pressure valve can be regulated by regulating the working voltage (power) of the diaphragm pump, so the structural design of, thereby the control gets into the discharge of heating unit for heating unit's heating power matches with inside water yield, and the heating effect of water is better.
Preferably, a first sealing ring is arranged in the step-shaped lantern ring, a support ring used for pressing the first sealing ring is arranged on the valve seat, a water inlet cavity communicated with the water outlet is formed between the inner wall of the support ring and the valve seat body, the flow control assembly comprises a return spring, a control rod, a pressure sensing diaphragm and a pressure plate, the periphery of the pressure sensing diaphragm is pressed and sealed between the valve cover and the valve body, the pressure sensing diaphragm and the valve cover form an atmospheric cavity, an atmospheric hole and the return spring are arranged on the valve cover, the negative pressure intracavity is arranged in to the clamp plate, and control lever one end is connected with the clamp plate bottom surface, and the other end runs through the valve body downwards, and reset spring is for setting up in the first spring in negative pressure chamber, and first spring housing is located on the control lever and one end is passed through the clamp plate and is acted on the pressure sensing diaphragm, and the other end is acted on the negative pressure intracavity wall, and the indent forms the restriction groove on the control lever, and the control lever reciprocates under the combined action of the negative pressure in negative pressure chamber, first spring, clamp plate and pressure sensing diaphragm and controls the on or off in water route between water inlet and the delivery port.
Preferably, the valve body is provided with a water sealing opening which is formed by a valve body and is positioned in the step-shaped sleeve ring, the water sealing opening is provided with a sealing plug for sealing the water sealing opening, the reset spring is a second spring arranged in the water inlet cavity, one end of the second spring acts on the control rod through the sealing plug, and the other end of the second spring acts on the inner wall of the water inlet cavity.
Preferably, a guide sleeve ring which is composed of a valve body and is located in the step-shaped sleeve ring is arranged in the valve body, a side flow channel which is communicated with the water inlet is formed in the side face of the guide sleeve ring, the periphery of the lower end of the control rod is connected with the guide sleeve ring in a matched mode through a third sealing ring, and the third sealing ring is arranged in an annular groove formed in the lower end of the control rod.
Preferably, a second sealing ring is sleeved on the side of the positioning sleeve ring and arranged between the valve body and the valve seat body.
The utility model discloses beneficial effect who has:
1. the negative pressure valve of the scheme is suitable for pressure and non-pressure water sources. When the diaphragm pump does not work, the flow control assembly has a water cut-off function; when the diaphragm pump works, the output flow of the negative pressure valve can be adjusted by adjusting the working voltage (power) of the diaphragm pump, so that the water flow entering the heating unit is controlled, the heating power of the heating unit is matched with the internal water quantity, and the heating effect of water is better.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of example 3;
FIG. 3 is a schematic structural view of the embodiment 4,
fig. 4 is a schematic system structure diagram of the application of the negative pressure valve.
Reference numerals: 1-water inlet, 2-valve body, 3-valve cover, 4-atmospheric cavity, 5-pressure sensing diaphragm, 6-atmospheric hole, 7-pressure plate, 8-first spring, 9-flow limiting groove, 10-control rod, 11-negative pressure cavity, 12-water outlet, 13-positioning lantern ring, 14-support ring, 15-water inlet cavity, 16-first sealing ring, 17-second sealing ring, 18-sealing plug, 19-second spring, 20-water sealing opening, 21-guiding lantern ring, 22-third sealing ring, 23-raw water end, 24-negative pressure valve, 25-diaphragm pump, 26-valve seat, 27-heating unit, 28-water outlet valve, 29-step lantern ring and 30-side flow channel.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and the terms are only for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that, unless otherwise explicitly specified or limited, the terms "disposed," "opened," "mounted," "connected," and "connected" are to be construed broadly, e.g., as either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1 and 4, a negative pressure valve, which comprises a valve body 2 and a valve seat 26 hermetically connected with each other, the valve seat 26 is provided with a water inlet 1, the valve body 2 is provided with a water outlet 12, the water outlet 12 is sequentially connected with a diaphragm pump 25, a heating unit 27 and a water outlet valve 28, the water inlet 1 is connected with a raw water end 23, a water path of the water inlet 1 communicated with the water outlet 12 is provided with a flow control assembly, the valve body 2 is provided with a step-shaped lantern ring 29 formed by a valve body 2 body, the valve seat 26 is provided with a positioning lantern ring 13 formed by a valve seat 26 body, the step-shaped lantern ring 29 and the positioning lantern ring 13 are mutually clamped, a negative pressure cavity 11 formed by the valve body 2 body is arranged between the water inlet 1 and the water outlet 12, the negative pressure cavity 11 is hermetically isolated and provided with an atmosphere cavity 4, and the flow control assembly controls the connection or the disconnection of the water inlet 1 and the water outlet 12 under the atmospheric pressure of the atmosphere cavity 4 and the negative pressure of the negative pressure cavity 11.
In the embodiment, the negative pressure cavity 11 communicated with the water inlet 1 is arranged in the valve body, when the diaphragm pump 25 does not work, the flow control assembly controls the waterway between the water inlet 1 and the water outlet 12 to be sealed, when the diaphragm pump 25 works, water flow or air in the negative pressure cavity 11 is sucked away to form a certain vacuum degree, at the moment, the flow control assembly controls the waterway between the water inlet 1 and the water outlet 12 to be communicated, the communicated flow is related to the negative pressure in the negative pressure cavity 11, the higher the negative pressure is, the larger the communicated flow is, the smaller the negative pressure is, the smaller the communicated flow is, and the negative pressure in the negative pressure cavity of the negative pressure valve 24 can be adjusted by adjusting the working voltage (power) of the diaphragm pump 25, so that the output flow of the negative pressure valve 24 during working can be adjusted by adjusting the working voltage (power) of the diaphragm pump 25, thereby controlling the water flow entering the, the heating power of the heating unit 27 is matched with the internal water quantity, and the heating effect of the water is better.
Example 2
As shown in fig. 1, a first sealing ring 16 is arranged in the step-shaped collar 29, a support ring 14 for pressing the first sealing ring 16 is arranged on the valve seat 26, a water inlet cavity 15 communicated with the water outlet 1 is formed by the inner wall of the support ring 14 and the valve seat 26, a flow control assembly comprises a return spring, a control rod 10, a pressure sensing diaphragm 5 and a pressure plate 7, the periphery of the pressure sensing diaphragm 5 is pressed and sealed between the valve cover 3 and the valve body 2, the pressure sensing diaphragm 5 and the valve cover 3 form an atmosphere cavity 4, an atmosphere hole 6 is arranged on the valve cover 3, the return spring and the pressure plate 7 are arranged in the negative pressure cavity 11, one end of the control rod 10 is connected with the bottom surface of the pressure plate 7, the other end of the control rod 10 penetrates through the valve body 2 downwards, the return spring is a first spring 8 arranged in the negative pressure cavity 11, the first spring 8 is sleeved on the control rod 10, one end of the first, the control rod 10 moves up and down under the combined action of the negative pressure cavity 11, the first spring 8, the pressure plate 7 and the pressure sensing diaphragm 5 to control the on/off of a water channel between the water inlet 1 and the water outlet 12.
The specific working principle of the flow control assembly of the embodiment is as follows: when the diaphragm pump 25 does not work, the sum of the acting force of the pressure in the negative pressure cavity 11 and the elastic force of the first spring 8 on the pressure sensing diaphragm 5 is larger than the acting force of the air pressure in the atmosphere cavity 4 on the pressure sensing diaphragm 5, and the control rod 10 seals a water path between the water inlet 1 and the water outlet 12 under the combined action of the acting forces; when the diaphragm pump 25 works, water flow or air in the negative pressure cavity 11 is sucked away to form a certain vacuum degree, at the moment, the sum of the pressure in the negative pressure cavity 11 and the acting force of the elastic force of the first spring 8 on the pressure sensing diaphragm 5 is smaller than the acting force of the pressure in the atmospheric cavity 4 on the pressure sensing diaphragm 5, the control rod 10 moves downwards under the combined action of the acting forces, namely the direction of the water inlet cavity 15, the side wall of the control rod 10 is provided with the flow limiting groove 9, namely the lower end of the control rod 10 is not provided with the flow limiting groove 9, the side wall above the lower end is provided with the flow limiting groove 9, the part of the lower end of the control rod 10 without the flow limiting groove 9 completely moves downwards into the water inlet cavity 15, and when the control rod continues to move downwards, the water inlet. When the flow-limiting groove 9 of the control rod 10 just moves down into the water inlet cavity 15, the flow channel through which the water inlet cavity 15 is communicated with the negative pressure cavity 11 through the flow-limiting groove 9 is small, the flow rate pumped by the diaphragm pump 25 is small, and if the control rod 10 moves down continuously, the distance that the part of the control rod 10 with the flow-limiting groove 9 moves down into the water inlet cavity 15 is longer, the area of the flow channel through which the water inlet cavity 15 is communicated with the negative pressure cavity 11 through the flow-limiting groove 9 is increased, and the flow rate pumped by the diaphragm pump 25 is increased. Therefore, by adjusting the working voltage (power) of the diaphragm pump 25, the negative pressure in the negative pressure cavity 11 can be adjusted, and further the distance of the control rod 10 moving downwards is adjusted, so that the function of adjusting the output water flow of the negative pressure valve 24 is achieved, the water flow entering the heating unit 27 is controlled, the heating power of the heating unit 27 is matched with the internal water flow, and the water heating effect is better.
Example 3
As shown in fig. 2, this embodiment is a further refinement of embodiment 2, specifically, a water sealing port 20 formed by a body of the valve body 2 and located in a stepped collar 26 is provided on the valve body 2, a sealing plug for sealing the water sealing port 20 is provided at the water sealing port 20, the return spring is a second spring 19 provided in the water inlet cavity 15, one end of the second spring 19 acts on the control rod 10 through the sealing plug 18, and the other end acts on the inner wall of the water inlet cavity 15. When the diaphragm pump 25 does not work, the sum of the acting force of the pressure in the negative pressure cavity 11 and the acting force of the pressure in the atmosphere cavity 4 on the pressure sensing diaphragm 5 is smaller than the elastic force of the second spring 19 on the sealing plug, the control rod 10 and the sealing plug 18 seal the water sealing hole 20 under the combined action of the acting forces, when the diaphragm pump 25 works, water flow or air in the negative pressure cavity 11 is sucked away to form a certain vacuum degree, at the moment, the acting force of the pressure in the negative pressure cavity 11 and the acting force of the pressure in the atmosphere cavity 4 on the pressure sensing diaphragm 5 is larger than the acting force of the second spring 19 on the sealing plug 18, the control rod 10 moves downwards under the combined action of the acting forces, namely, in the direction of the water inlet cavity 15, the part without the limiting groove 9 at the lower end of the control rod 10 completely moves downwards into the water inlet cavity 15, and. When the flow-limiting groove 9 of the control rod 10 just moves down into the water inlet cavity 15, the flow channel through which the water inlet cavity 15 is communicated with the negative pressure cavity 11 through the flow-limiting groove 9 is small, the flow rate pumped by the diaphragm pump 25 is small, and if the control rod 10 moves down continuously, the distance that the part of the control rod 10 with the flow-limiting groove 9 moves down into the water inlet cavity 15 is longer, the area of the flow channel through which the water inlet cavity 15 is communicated with the negative pressure cavity 11 through the flow-limiting groove 9 is increased, and the flow rate pumped by the diaphragm pump 25 is increased. Therefore, by adjusting the working voltage (power) of the diaphragm pump 25, the negative pressure in the negative pressure cavity 11 can be adjusted, and further the distance of the control rod 10 moving downwards is adjusted, so that the function of adjusting the output water flow of the negative pressure valve 24 is achieved, the water flow entering the heating unit 27 is controlled, the heating power of the heating unit 27 is matched with the internal water flow, and the water heating effect is better.
Example 4
As shown in fig. 3, this embodiment is a further refinement of embodiment 2, specifically, a guide collar 21 formed by a body of the valve body 2 and located in a stepped collar 29 is arranged in the valve body 2, a side flow channel 30 communicated with the water inlet 1 is arranged on a side surface of the guide collar 21, a periphery of a lower end of the control rod 10 is hermetically connected with the guide collar 21 through a third sealing ring 22, and the third sealing ring 22 is arranged in an annular groove arranged at a lower end of the control rod 10. When the diaphragm pump 25 works, water flow or air in the negative pressure cavity 11 is sucked away to form a certain vacuum degree, at the moment, the sum of the acting force of the pressure in the negative pressure cavity 11 and the elastic force of the first spring 8 on the pressure sensing diaphragm 5 is smaller than the acting force of the pressure in the atmospheric cavity 4 on the pressure sensing diaphragm 5, the control rod 10 moves downwards under the combined action of the acting forces, namely the direction of the water inlet cavity 15, when the third sealing ring 22 sleeved at the lower end of the control rod 10 is positioned at the upper end of the side flow channel 30 and continues to move downwards, at the moment, the water inlet cavity 15 is communicated with the negative pressure cavity 11 through a gap between the control rod 10 and the valve body 2. When the third sealing ring 22 is just positioned at the side runner 30, the runner for communicating the water inlet cavity 15 with the negative pressure cavity 11 is smaller, the pumped flow of the diaphragm pump 25 is smaller, and if the control rod 10 moves downwards continuously, the distance for the control rod 10 to move downwards into the water inlet cavity 15 is longer, the area of the runner for communicating the water inlet cavity 15 with the negative pressure cavity 11 through the side runner 30 is increased, and the pumped flow of the diaphragm pump 25 is increased. Therefore, by adjusting the working voltage (power) of the diaphragm pump 25, the negative pressure in the negative pressure cavity 11 can be adjusted, and further the distance of the control rod 10 moving downwards is adjusted, so that the function of adjusting the output water flow of the negative pressure valve 24 is achieved, the water flow entering the heating unit 27 is controlled, the heating power of the heating unit 27 is matched with the internal water flow, and the water heating effect is better.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and the technical essence of the present invention is that within the spirit and principle of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments are all within the protection scope of the technical solution of the present invention.
Claims (5)
1. A negative pressure valve, negative pressure valve (24) includes valve body (2) and disk seat (26) of mutual close connection, be equipped with water inlet (1) on disk seat (26), be equipped with delivery port (12) on valve body (2), delivery port (12) connect gradually diaphragm pump (25), heating unit (27), outlet valve (28), be equipped with accuse stream subassembly on the water route that water inlet (1) and delivery port (12) communicate, its characterized in that, step form lantern ring (29) that valve body (2) body constitutes has on valve body (2), be equipped with the position lantern ring (13) that constitutes by disk seat (26) body on disk seat (26), step form lantern ring (29) and position lantern ring (13) joint each other, be equipped with negative pressure chamber (11) that constitute by valve body (2) body between water inlet (1) and delivery port (12), airtight wall is equipped with atmospheric cavity (4) on negative pressure chamber (11), the flow control assembly controls the connection or the disconnection of the water inlet (1) and the water outlet (12) under the action of the atmospheric pressure of the atmospheric air cavity (4) and the negative pressure of the negative pressure cavity (11).
2. The negative pressure valve according to claim 1, wherein a first sealing ring (16) is arranged in the step-shaped sleeve ring (29), a support ring (14) for pressing the first sealing ring (16) is arranged on the valve seat (26), a water inlet cavity (15) communicated with the water outlet (12) is formed by the inner wall of the support ring (14) and the body of the valve seat (26), the flow control assembly comprises a return spring, a control rod (10), a pressure sensing diaphragm (5) and a pressure plate (7), the periphery of the pressure sensing diaphragm (5) is tightly pressed and sealed between the valve cover (3) and the valve body (2), the pressure sensing diaphragm (5) and the valve cover (3) form an atmospheric cavity (4), an atmospheric hole (6) is formed in the valve cover (3), the return spring and the pressure plate (7) are arranged in the negative pressure cavity (11), one end of the control rod (10) is connected with the bottom surface of the pressure plate (7), and the, reset spring is for setting up in first spring (8) of negative pressure chamber (11), first spring (8) cover is located on control lever (10) and one end is passed through clamp plate (7) and is acted on pressure sensing diaphragm (5), the other end is used on negative pressure chamber (11) inner wall, inwards indent formation restriction groove (9) on control lever (10), control lever (10) are at the negative pressure in negative pressure chamber (11), first spring (8), the combined action of clamp plate (7) and pressure sensing diaphragm (5) is down moved the on-off of water route between control water inlet (1) and delivery port (12) or be disconnected.
3. The negative pressure valve according to claim 2, characterized in that the valve body (2) is provided with a water sealing opening (20) which is formed by the body of the valve body (2) and is positioned in the stepped sleeve ring (29), a sealing plug (18) for sealing the water sealing opening (20) is arranged at the water sealing opening (20), the return spring is a second spring (19) arranged in the water inlet cavity (15), one end of the second spring (19) acts on the control rod (10) through the sealing plug (18), and the other end of the second spring acts on the inner wall of the water inlet cavity (15).
4. The negative pressure valve as claimed in claim 2, wherein a guide sleeve ring (21) formed by the valve body (2) body and located in a step-shaped sleeve ring (29) is arranged in the valve body (2), a side flow passage (30) communicated with the water inlet (1) is arranged on the side surface of the guide sleeve ring (21), the periphery of the lower end of the control rod (10) is in matched connection with the guide sleeve ring (21) through a third sealing ring (22), and the third sealing ring (22) is arranged in an annular groove arranged at the lower end of the control rod (10).
5. A negative pressure valve according to claim 1, characterized in that the side of the positioning collar (13) is fitted with a second sealing ring (17), the second sealing ring (17) being arranged between the body of the valve body (2) and the body of the valve seat (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021912268.XU CN213088793U (en) | 2020-09-04 | 2020-09-04 | Negative pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021912268.XU CN213088793U (en) | 2020-09-04 | 2020-09-04 | Negative pressure valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213088793U true CN213088793U (en) | 2021-04-30 |
Family
ID=75634830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021912268.XU Active CN213088793U (en) | 2020-09-04 | 2020-09-04 | Negative pressure valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213088793U (en) |
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2020
- 2020-09-04 CN CN202021912268.XU patent/CN213088793U/en active Active
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