Negative pressure valve
By designing a negative pressure valve that uses the pressure difference in the air chamber to control the opening and closing of the valve plug, the problems of complex structure and high cost of existing drinking water systems are solved, achieving stable water flow, energy saving and low-cost water supply.
Patent Information
- Application Number
- CN202423174071.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing drinking water systems have complex structures, resulting in high manufacturing costs and requiring additional flow control valves and check valves.
Design a negative pressure valve that uses a negative pressure diaphragm assembly and push rod mechanism to control the opening and closing of the valve plug. The flow can be turned on and off instantly by the pressure difference of the air chamber, simplifying the structure and eliminating the need for additional flow regulating valves and check valves.
It achieves smooth water flow, prevents backflow, stabilizes pipeline water pressure, reduces manufacturing and maintenance costs, saves energy, and prevents water waste.
Smart Images
Figure CN223498802U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water valve technology, specifically to a negative pressure valve. Background Technology
[0002] Typical drinking water systems, such as tea stoves, usually have a water tank that stores water. When water is added to the tea stove, a booster pump draws bottled water directly into the stove, thus fulfilling the function of adding water. The water source in the tank is usually unpressurized, so a booster pump is needed. However, because flow regulation is required, additional flow control valves and check valves are necessary, resulting in a complex structure and high cost. Utility Model Content
[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a negative pressure valve that can effectively solve the problem of high manufacturing cost caused by the complex structure of existing drinking water systems.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] This utility model provides a negative pressure valve, including an upper valve cover, a main valve body, and a lower valve cover. The upper valve cover has an inlet, and the main valve body has an outlet and a valve port. An inlet chamber is formed between the valve port and the upper valve cover, and an outlet chamber is formed between the valve port and the lower valve cover. The inlet chamber is connected to the inlet, and a valve plug and a pressure member are provided in the inlet chamber. The pressure member is located above the valve plug and is used to drive the valve plug to move downward to block the valve port. A negative pressure diaphragm assembly is installed in the outlet chamber. The negative pressure diaphragm assembly is used to divide the outlet chamber into a negative pressure chamber and an air chamber. The negative pressure chamber is connected to the outlet, and the air chamber is connected to the outside air. The negative pressure diaphragm assembly moves upward under the pressure of the air chamber to push the valve plug upward, so that the inlet and outlet are connected.
[0006] In this utility model, as an optional embodiment, the negative pressure diaphragm assembly includes a negative pressure diaphragm and a push rod mechanism. The negative pressure diaphragm divides the water outlet chamber into a negative pressure chamber and an air chamber. The push rod mechanism is installed above the negative pressure diaphragm. The push rod mechanism is used to contact the valve plug and drive the valve plug to move upward when the negative pressure diaphragm assembly moves upward under the pressure of the air chamber, so as to open the valve port and connect the water inlet and the water outlet.
[0007] In this utility model, as an optional embodiment, the push rod mechanism includes a push rod and a disc. The disc is disposed on a negative pressure diaphragm. One end of the push rod is connected to the disc, and the other end of the push rod is used to abut against the valve plug when the push rod mechanism moves upward to drive the valve plug to move upward.
[0008] In this utility model, as an optional embodiment, a positioning structure is provided on the surface of the disk that is close to the negative pressure diaphragm.
[0009] In this utility model, as an optional embodiment, the positioning structure consists of a plurality of positioning holes, and the negative pressure diaphragm is provided with protrusions, the protrusions corresponding one-to-one with the positioning holes.
[0010] In this utility model, as an optional embodiment, the negative pressure diaphragm includes a telescopic part, a sealing part, and a bending part. One end of the telescopic part is connected to the sealing part through the bending part. The sealing part is installed on the lower valve cover. The telescopic part is used to extend and move upward under the pressure of the air chamber. The push rod mechanism is connected to the telescopic part.
[0011] In this utility model, as an optional embodiment, the negative pressure diaphragm, push rod mechanism, valve plug, pressing member and valve port are located on the same straight line.
[0012] In this utility model, as an optional embodiment, the upper valve cover is provided with a water inlet baffle corresponding to the position of the water inlet.
[0013] In this utility model, as an optional embodiment, the lower valve cover is provided with an air inlet for connecting the air chamber and the outside air.
[0014] In this utility model, as an optional embodiment, a sealing ring is also provided between the upper valve cover and the main valve body to make the upper valve cover and the main valve body airtight.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] This utility model's negative pressure valve includes an upper valve cover, a main valve body, and a lower valve cover. When the valve is in the closed state, although the inlet of the upper valve cover is open, the valve plug is pressed against the valve port due to the action of the lower pressure component, preventing water from flowing from the inlet chamber into the outlet chamber. Simultaneously, the negative pressure diaphragm assembly is held in a relatively high position by the pressure in the air chamber (connected to external air), but it cannot directly open the valve port due to the obstruction of the valve plug. When the water flow at the outlet generates negative pressure (i.e., pressure lower than atmospheric pressure), the pressure in the air chamber becomes higher than that in the negative pressure chamber. This pressure difference causes the negative pressure diaphragm assembly to move upward, pushing the valve plug upward as well, thus opening the valve port. Direct connection between the inlet and outlet allows water to flow out. When the water pump stops working, the negative pressure diaphragm will extend and retract downward to reset, and the valve plug will be pressed down... Driven by the component, the valve port is sealed, and the flow rate is determined by the external water pump throughput. It can be opened or stopped instantly, with a simple structure, smooth water flow, and no resonance phenomenon. The embodiment has a simple structure, requires no external power supply or manual control, and achieves energy saving. When there is no water demand, the valve automatically closes to prevent water waste. When water is needed, the negative pressure valve can respond quickly and open the valve to ensure smooth water flow and improve water supply efficiency. The design of the negative pressure valve ensures that the water flow can only flow in one direction, preventing backflow caused by pressure changes in the pipeline. It also helps to stabilize the water pressure in the pipeline and prevent system instability caused by pressure fluctuations. The overall structure is simple, easy to install, and does not require additional flow regulating valves or check valves, resulting in low cost and reduced maintenance costs. Attached Figure Description
[0017] Figure 1 This is a cross-sectional structural diagram of a negative pressure valve according to an embodiment of the present utility model;
[0018] Figure 2 This is a schematic diagram of the main valve body according to an embodiment of the present utility model;
[0019] Figure 3 This is a schematic diagram of the structure of the negative pressure diaphragm according to an embodiment of the present invention;
[0020] Figure 4 This is a schematic diagram of the push rod mechanism according to an embodiment of the present utility model;
[0021] Figure 5 This is a cross-sectional view of the upper valve cover according to an embodiment of the present invention.
[0022] Figure 6 This is a schematic diagram of the lower valve cover according to an embodiment of the present utility model;
[0023] Figure 7 This is a schematic diagram of the upper valve cover in an embodiment of the present utility model.
[0024] In the diagram: 1. Upper valve cover; 10. Water inlet; 11. Water inlet chamber; 12. Valve plug; 13. Lower pressure component; 14. Water inlet baffle;
[0025] 2. Main valve body; 20. Outlet; 21. Valve port; 22. Outlet chamber; 221. Negative pressure chamber; 222. Air chamber; 23. Negative pressure diaphragm; 231. Telescopic part; 232. Sealing part; 233. Protrusion; 24. Push rod mechanism; 241. Push rod; 242. Disc; 243. Positioning hole; 25. Sealing ring;
[0026] 3. Lower valve cover; 301. Annular groove. Detailed Implementation
[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0028] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.
[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0030] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.
[0031] Please refer to Figure 1-7 As shown in the figure, this embodiment provides a negative pressure valve, characterized in that it includes an upper valve cover 1, a main valve body 2, and a lower valve cover 3. The upper valve cover 1 is provided with an inlet 10, and the main valve body 2 is provided with an outlet 20 and a valve port 21. An inlet chamber 11 is formed between the valve port 21 and the upper valve cover 1, and an outlet chamber 22 is formed between the valve port 21 and the lower valve cover 3. The inlet chamber 11 is connected to the inlet 10, and a valve plug 12 and a pressure member 13 are provided in the inlet chamber 11. The pressure member 13 is located at the valve... Above the valve plug 12, a negative pressure diaphragm assembly is installed to drive the valve plug 12 to move downward to block the valve port 21. The negative pressure diaphragm assembly is used to divide the water outlet chamber 22 into a negative pressure chamber 221 and an air chamber 222. The negative pressure chamber 221 is connected to the water outlet 20, and the air chamber 222 is connected to the outside air. The negative pressure diaphragm assembly moves upward under the pressure of the air chamber 222 to push the valve plug 12 upward, so that the water inlet 10 is connected to the water outlet 20.
[0032] The negative pressure valve in this embodiment includes an upper valve cover 1, a main valve body 2, and a lower valve cover 3. When the valve is in the closed state, although the inlet 10 of the upper valve cover 1 is open, the valve plug 12 is pressed against the valve port 21 due to the action of the lower pressure member 13, preventing water from flowing from the inlet chamber 11 into the outlet chamber 22. At the same time, the negative pressure diaphragm assembly is held in a relatively high position under the pressure of the air chamber 222 (which is connected to the outside air), but it cannot directly open the valve port 21 due to the obstruction of the valve plug 12. When the water flow at the outlet 20 generates negative pressure (i.e., the pressure is lower than atmospheric pressure), the pressure of the air chamber 222 becomes higher than that of the negative pressure chamber 221. The pressure difference causes the negative pressure diaphragm assembly to move upward, pushing the valve plug 12 to move upward as well, thereby opening the valve port 21. The inlet 10 and the outlet 20 are directly connected to achieve water discharge. When the water pump stops working, the negative pressure... The diaphragm assembly extends and retracts downwards to reset, and the valve plug 12, driven by the pressure member 13, seals the valve port 21. The flow rate is determined by the external water pump throughput, allowing for immediate opening or stopping. The structure is simple, the water flow is smooth, and there is no resonance. The embodiment has a simple structure, requires no external power supply or manual control, and achieves energy saving. When there is no water demand, the valve automatically closes, preventing water waste. When water is needed, the negative pressure valve can respond quickly and open the valve, ensuring smooth water flow and improving water supply efficiency. The design of the negative pressure valve ensures that the water flow can only flow in one direction, preventing backflow caused by pressure changes in the pipeline. It also helps stabilize the water pressure in the pipeline, preventing system instability caused by pressure fluctuations. The overall structure is simple, easy to install, and does not require additional flow regulating valves or check valves, resulting in low cost and reduced maintenance costs.
[0033] Furthermore, the negative pressure diaphragm assembly of this embodiment includes a negative pressure diaphragm 23 and a push rod mechanism 24. The negative pressure diaphragm 23 divides the outlet chamber 22 into a negative pressure chamber 221 and an air chamber 222. The push rod mechanism 24 is installed above the negative pressure diaphragm 23. The push rod mechanism 24 is used to contact the valve plug 12 and drive the valve plug 12 to move upward when the negative pressure diaphragm assembly moves upward under the pressure of the air chamber 222, thereby opening the valve port 21 and connecting the inlet port 10 and the outlet port 20. The negative pressure diaphragm 23 is a flexible membrane that can divide the outlet chamber 22 into the negative pressure chamber 221 and the air chamber 222. When the negative pressure diaphragm 23 extends upward under the pressure of the air chamber 222, the push rod mechanism 24 moves upward accordingly. The negative pressure diaphragm assembly precisely controls the opening and closing of valve port 21 based on the pressure difference between air chamber 222 and negative pressure chamber 221, helping to maintain the stability of water flow in the pipeline and preventing water supply problems caused by pressure fluctuations. Both the negative pressure diaphragm 23 and the push rod mechanism 24 are lightweight and flexible components, capable of rapidly responding to changes in pressure in air chamber 222. When water is needed, the negative pressure valve opens quickly, ensuring a timely water supply. The negative pressure diaphragm 23 and push rod mechanism 24 are typically made of corrosion-resistant and wear-resistant materials, maintaining stable performance in various harsh operating environments and extending the service life of the negative pressure valve.
[0034] Furthermore, the push rod mechanism 24 includes a push rod 241 and a disc 242. The disc 242 is disposed on the negative pressure diaphragm 23. One end of the push rod 241 is connected to the disc 242, and the other end of the push rod 241 is used to abut against the valve plug 12 when the push rod mechanism 24 moves upward, thereby driving the valve plug 12 to move upward. The design of the disc 242 allows it to fit tightly against the negative pressure diaphragm 22, thereby ensuring that the disc 242 can move together with the negative pressure diaphragm 23 when the pressure in the air chamber 222 changes. The disc 242 is typically made of a lightweight material with a certain degree of rigidity to ensure that it can effectively transmit pressure changes without adding too much weight. The push rod 241 connects the disc 242 and the valve plug 12. One end is connected to the disc 242, and the other end abuts against the valve plug 12. When the pressure in the air chamber 222 increases, pushing the negative pressure diaphragm 23 and the disc 242 upward, the push rod 241 also moves upward. The end of the push rod 241 is designed with a contact surface that matches the valve plug 12 to ensure that when the push rod 241 moves upward, it can accurately push the valve plug 12 upward, thereby opening the valve port 21. The working principle of the push rod mechanism 24 is that when the pressure in the air chamber 222 increases, the negative pressure diaphragm 23 is subjected to upward pressure, which drives the disc 242 to move upward together. The movement of the disc 242 is transmitted to the valve plug 12 through the push rod 241, causing the valve plug 12 to also move upward. When the valve plug 12 rises to a certain height, it opens the valve port 21, allowing water to flow from the inlet 10 into the outlet 20. Conversely, when the pressure in the air chamber 222 decreases, the negative pressure diaphragm 23 and the disc 242 are moved downwards by the pressure from the negative pressure chamber 221. At this time, the push rod 241 also moves downwards, causing the valve plug 12 to move downwards, thereby closing the valve port 21. Through the precise design of the disc 242 and the push rod 241, the push rod mechanism 24 can achieve precise control of the valve plug 12, helping to maintain the stability of the water flow in the pipeline and preventing water supply problems caused by inaccurate positioning of the valve plug 12. When water is needed, the negative pressure valve can quickly open the valve to ensure timely water supply.
[0035] A positioning structure is provided on the surface of the disc 242 adjacent to the negative pressure diaphragm 23. This positioning structure provides additional support and constraint, enhancing the connection stability between the disc 242 and the negative pressure diaphragm 23, and helping to prevent relative sliding or misalignment between them under high pressure or high-speed movement conditions. The positioning structure ensures the disc 242 follows a precise path during movement. Furthermore, by reducing friction and wear between the disc 242 and the negative pressure diaphragm 23, the positioning structure helps extend the overall service life of the negative pressure valve. Further, the positioning structure consists of several positioning holes 243, and the negative pressure diaphragm 23 has protrusions 233, each corresponding one-to-one with a positioning hole 243. This one-to-one correspondence between the protrusions 233 and the positioning holes 243 ensures precise alignment between the negative pressure diaphragm 23 and the disc 242, helping to reduce performance degradation or malfunctions caused by positional deviations. The engagement of the positioning hole 243 and the protrusion 233 restricts the relative movement between the negative pressure diaphragm 23 and the disk 242, helping to prevent misalignment or displacement between the negative pressure diaphragm 23 and the disk 242 under high pressure or high-speed conditions. Furthermore, the design of the positioning hole 243 and the protrusion 233 simplifies the installation process between the negative pressure diaphragm 23 and the disk 242, enabling quick and accurate installation without additional fixing devices or tools.
[0036] The negative pressure diaphragm 23 of the embodiment includes a telescopic portion 231, a sealing portion 232, and a bending portion. One end of the telescopic portion 231 is connected to the sealing portion 232 via the bending portion. The sealing portion 232 is mounted on the lower valve cover 3. The telescopic portion 231 is used to extend upward under the pressure of the air chamber 222. The push rod mechanism 24 is connected to the telescopic portion 231. The negative pressure diaphragm 23 is one of the core components of the negative pressure valve of the embodiment. The negative pressure diaphragm 23 includes a telescopic portion 231, a sealing portion 232, and a bending portion. The telescopic portion 232 is the main part of the negative pressure diaphragm 23 that responds to changes in the pressure of the air chamber 222. When the pressure of the air chamber 222 increases, the telescopic portion 232 extends upward, thereby pushing the push rod mechanism 24 and controlling the position of the valve plug 12. The telescopic portion 231 is usually made of an elastic material, such as rubber, silicone, or elastic plastic, to ensure that it can deform and recover when the pressure changes. The sealing part 232 is the portion of the negative pressure diaphragm 23 used to form a seal with the lower valve cover 3 or other components, ensuring that no water leaks out from the valve port 21 when the negative pressure valve is closed. The sealing part 232 is typically installed on the lower valve cover 3 by fasteners, adhesives, or other means to ensure a tight fit between them. The sealing part also needs to be made of an elastic material to ensure that it can maintain its sealing performance during long-term use. The bending part is the transition section connecting the telescopic part 231 and the sealing part 232, allowing the telescopic part 231 to deform when the pressure in the air chamber 222 changes, while maintaining a stable connection with the sealing part 232. The telescopic part 231, the sealing part 232, and the bending part of the negative pressure diaphragm 23 work together to realize the opening and closing function of the negative pressure valve. Through reasonable design and material selection, the negative pressure diaphragm 23 can maintain stable performance and sealing performance during long-term use.
[0037] As a preferred implementation, the negative pressure diaphragm 23, push rod mechanism 24, valve plug 12, pressure reducing element 13, and valve port 21 are located on the same straight line. This arrangement simplifies the internal structure of the negative pressure valve, reduces manufacturing costs, and when the pressure in the air chamber 222 changes, the negative pressure diaphragm 23 directly transmits force to the valve plug 12 through the push rod mechanism 24. Since all components are located on the same straight line, the force transmission is more direct and efficient. The linear arrangement makes the movement path of the valve plug 12 clearer and more stable, which helps to achieve precise control of the valve port 21 and ensures that the negative pressure valve can be quickly opened or closed when needed. When the negative pressure diaphragm 23, push rod mechanism 24, valve plug 12, pressure reducing element 13, and valve port 21 are located on the same straight line, it brings advantages such as rapid response, reduced failure rate, ease of maintenance, and improved reliability.
[0038] Furthermore, in this embodiment, an inlet baffle 14 corresponding to the position of the inlet 10 is provided on the upper valve cover 1. The main function of the inlet baffle 14 is to guide the water flow smoothly from the inlet 10 into the interior of the negative pressure valve, ensuring that the water flow is not obstructed or turbulent when entering the negative pressure valve. It not only guides the water flow smoothly into the negative pressure valve but also prevents backflow and increases the stability of the negative pressure valve.
[0039] The main valve body 2 is provided with a guide structure 201 for the valve plug 12 to move up and down. Water flow channels 202 are provided around the guide structure 201. The pressure member 13 preferably has a spring inside the guide structure. One end of the spring abuts against the bottom surface of the upper valve cover 1, and the other end abuts against the valve plug 12. The upper surface of the main valve body 2 has a mounting recess 203, and the corresponding upper valve cover 1 has a mounting protrusion and an inlet 10. The mounting recess 203 and the mounting protrusion can be used together to arrange the inlet 10 and outlet 20 at 180 degrees or 90 degrees, meeting different spatial requirements. The lower valve cover 3 has an annular groove 301, and the main valve body 2 has an annular wall 204, allowing the outer sealing part of the negative pressure diaphragm 23 to be sealed within the annular groove 301.
[0040] The lower valve cover 3 is provided with an air inlet for connecting the air chamber 222 and external air. The main function of the air inlet is to allow external air to enter the air chamber 222 to balance the pressure difference between the inside and outside of the air chamber 222. When the negative pressure valve is closed, the air pressure inside the air chamber 222 may decrease, forming a negative pressure. At this time, the air inlet allows external air to enter to prevent excessive negative pressure from forming inside the air chamber 222, thereby protecting the negative pressure valve and its related components from damage. The air inlet not only balances the pressure difference between the inside and outside of the air chamber, but also regulates the airflow entering the air chamber 222 and prevents the entry of external contaminants.
[0041] In this embodiment, a sealing ring 25 is also provided between the upper valve cover 1 and the main valve body 2 to ensure a tight seal between them. The sealing ring 25 ensures the airtightness between the upper valve cover 1 and the main valve body 2, primarily preventing leakage. During the operation of the negative pressure valve, if there is a gap or leakage between the upper valve cover 1 and the main valve body 2, the air pressure in the air chamber 222 may not remain stable, thus affecting the normal operation of the negative pressure valve. The sealing ring 25, through its elasticity and compressibility, can tightly fit between the upper valve cover 1 and the main valve body 2, forming an effective sealing barrier. This helps maintain stable internal pressure in the negative pressure valve, preventing external air or fluid from entering, and also preventing internal fluid from leaking to the outside.
[0042] Although only certain components and embodiments of this application have been illustrated and described, many modifications and alterations will be apparent to those skilled in the art without actually departing from the scope and spirit of the claims, such as variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.
[0043] The above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. Any non-substantial changes and substitutions made by those skilled in the art based on the present utility model shall fall within the scope of protection claimed by the present utility model.
Claims
1. A negative pressure valve, characterized in that, The device includes an upper valve cover, a main valve body, and a lower valve cover. The upper valve cover has an inlet, and the main valve body has an outlet and a valve port. An inlet chamber is formed between the valve port and the upper valve cover, and an outlet chamber is formed between the valve port and the lower valve cover. The inlet chamber is connected to the inlet and contains a valve plug and a pressure member. The pressure member is located above the valve plug and is used to drive the valve plug to move downward to seal the valve port. A negative pressure diaphragm assembly is installed in the outlet chamber. The negative pressure diaphragm assembly is used to divide the outlet chamber into a negative pressure chamber and an air chamber. The negative pressure chamber is connected to the outlet, and the air chamber is connected to external air. The negative pressure diaphragm assembly moves upward under the pressure of the air chamber to push the valve plug upward, so that the inlet and outlet are connected.
2. The negative pressure valve according to claim 1, characterized in that, The negative pressure diaphragm assembly includes a negative pressure diaphragm and a push rod mechanism. The negative pressure diaphragm divides the water outlet chamber into a negative pressure chamber and an air chamber. The push rod mechanism is installed above the negative pressure diaphragm. The push rod mechanism is used to push the negative pressure diaphragm assembly to move upward under the pressure of the air chamber, contact the valve plug and drive the valve plug to move upward, so as to open the valve port and connect the water inlet and the water outlet.
3. The negative pressure valve according to claim 2, characterized in that, The push rod mechanism includes a push rod and a disc. The disc is disposed on a negative pressure diaphragm. One end of the push rod is connected to the disc, and the other end of the push rod is used to abut against the valve plug when the push rod mechanism moves upward, thereby driving the valve plug to move upward.
4. The negative pressure valve according to claim 3, characterized in that, The surface of the disk that is close to the negative pressure diaphragm is provided with a positioning structure.
5. The negative pressure valve according to claim 4, characterized in that, The positioning structure consists of several positioning holes, and the negative pressure diaphragm has protrusions that correspond one-to-one with the positioning holes.
6. The negative pressure valve according to claim 2, characterized in that, The negative pressure diaphragm includes a telescopic part, a sealing part, and a bending part. One end of the telescopic part is connected to the sealing part through the bending part. The sealing part is installed on the lower valve cover. The telescopic part is used to extend and move upward under the pressure of the air chamber. The push rod mechanism is connected to the telescopic part.
7. The negative pressure valve according to claim 2, characterized in that, The negative pressure diaphragm, push rod mechanism, valve plug, pressure member and valve port are located on the same straight line.
8. The negative pressure valve according to claim 1, characterized in that, The upper valve cover is provided with an inlet baffle corresponding to the position of the inlet.
9. The negative pressure valve according to claim 1, characterized in that, The lower valve cover is provided with an air inlet for connecting the air chamber and the outside air.
10. The negative pressure valve according to claim 1, characterized in that, A sealing ring is also provided between the upper valve cover and the main valve body to ensure a tight seal between them.