Negative pressure water suction valve

Abstract

The utility model relates to a negative pressure water suction valve which comprises a valve shell piece, a water inlet and a water pumping port, a valve hole, a piston rod and a negative pressure diaphragm are arranged in the valve shell piece, an inner cavity of the valve shell piece is provided with a water inlet cavity, a negative pressure cavity and an atmosphere cavity, the piston rod faces upwards to open the valve hole, and the piston rod is further driven by an elastic piece to reset downwards to block the valve hole. An outer through hole is further formed in the top of the valve shell part, the piston rod is provided with a first rod head part penetrating through the valve hole in the lower end of the water inlet cavity and a second rod head part penetrating through the outer through hole in the upper end of the water inlet cavity, a first O-shaped sealing ring capable of being in sealing fit with the inner wall of the valve hole is arranged on the first rod head part, and the second rod head part and the outer through hole are further sealed through a second O-shaped sealing ring; the piston rod is of a non-equal-diameter structure, the outer diameter of a first rod head portion is larger than that of a second rod head portion, the outer diameter of a first O-shaped sealing ring protruding outwards on the first rod head portion is larger than that of the second rod head portion, and the pressed area difference is formed, so that the piston rod has downward movement force in the water pressure pressurization state. The piston rod can conveniently move downwards to close the valve hole.

Description

Technical Field

[0001] The utility model relates to a negative pressure water suction valve. Background Art

[0002] Typical drinking water systems typically include a water tank to store water, but this tank is susceptible to bacterial contamination. This led to the development of a negative pressure valve, which can provide the required water flow to the drinking water heating system. The pressure at the water supply end is unlimited; if there is no negative pressure at the water outlet, no water will flow. The negative pressure generated by the pump draws water from the pressurized water supply end, and if there is no negative pressure at the water outlet, water flow stops immediately. The flow rate is determined by the negative pressure at the water outlet (pump speed minus flow rate). This valve replaces the water tank in drinking water systems, operating in a fully sealed manner to prevent contamination of drinking water by bacteria in the air.

[0003] A typical negative pressure valve comprises a valve body having a water inlet, a water outlet, and a valve cavity therein. The valve cavity is vertically opened in the valve body, and a water inlet hole connected to the water inlet is provided on the side of the valve cavity, and a water outlet hole connected to the water outlet is provided at the head end. A valve stem that can slide up and down to control the opening of the water outlet hole is provided in the valve cavity. An elastic reset device is provided between the tail end of the valve stem and the tail end of the valve cavity, and a flexible balancing ring is provided at the head end. The inner side of the flexible balancing ring is sealed at the head end of the valve cavity, and the outer side is connected to the outside of the valve body. When there is no negative pressure from the water inlet at the water outlet, the elastic reset device resets the valve stem to control the closure of the water outlet hole. When there is negative pressure from the water inlet at the water outlet, the same negative pressure is generated in the valve cavity, and the negative pressure causes the valve stem to compress the elastic reset device to control the opening of the water outlet hole. Since the elastic reset force provided by the elastic reset device is always consistent, when the water pressure in the valve cavity reaches a certain level, the elastic reset device fails and cannot overcome the resistance to drive the valve stem to slide and reset to close the water outlet hole, resulting in the problem that the water outlet hole cannot be closed. Utility Model Content

[0004] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a negative pressure water suction valve, which can make the piston rod have the force to move downward under the water pressure state.

[0005] The technical solution of the utility model is: a negative pressure water suction valve, including a valve shell, a water inlet and a water pumping port, the valve shell is provided with a valve hole, a piston rod which can slide up and down, and a negative pressure diaphragm located below the valve hole, and the inner cavity of the valve shell is further divided into: a water inlet cavity which is located above the valve hole and communicated with the side water inlet, a negative pressure cavity which is located between the valve hole and the negative pressure diaphragm and communicated with the water pumping port, and an atmospheric cavity which is located below the negative pressure diaphragm and communicates with the outside world, the upward deformation displacement of the negative pressure diaphragm can drive the piston rod upward to open the valve hole, and the piston rod is also driven downward by an elastic member to reset to block the valve hole. An external through hole is also opened on the top of the valve housing, and the piston rod has a rod head 1 that passes through the valve hole at the lower end of the water inlet chamber, and a rod head 2 that passes through the external through hole at the upper end of the water inlet chamber. The rod head 1 is provided with an O-ring 1 that can form a sealing fit with the inner wall of the valve hole, and the rod head 2 is also sealed with the external through hole by an O-ring 2. The piston rod is a non-uniform diameter structure, and the outer diameter of its rod head 1 is larger than that of the rod head 2, and the outer diameter of the O-ring 1 protruding outward on the rod head 1 is larger than that of the rod head 2 to form a pressure area difference, thereby realizing that the piston rod has the force to move downward under the water pressure state.

[0006] By adopting the above technical solution, when water enters from the side water inlet, the water pressure in the water inlet chamber will generate force on the piston rod in two directions: the outward through hole and the valve hole. Under the action of water pressure, since the piston rod is a non-uniform diameter structure and there is a difference in pressure area, the pressure it bears will be different. The downward force acting on the piston rod is greater than the upward force. The pressure difference force in the upper and lower directions can drive the piston rod to move downward, and the force will increase with the increase of water pressure. In the process of increasing water pressure, the piston rod can also be driven downward to facilitate closing the water outlet. When the water pressure is low and the pressure difference force acting on the piston rod is small, the elastic member assists the piston rod in closing the valve hole downward.

[0007] Preferably, a sealing groove is provided on the inner peripheral wall of the outer through hole, and the second O-ring is installed in the sealing groove and is in sealing contact with the second peripheral surface of the rod head. The chamber formed by the second peripheral surface of the rod head and the sealing groove is also connected to the water inlet chamber through the water hole. The second O-ring can deform and hold the piston rod tightly under the pressure of water pressure. During flow-limited pumping, the piston rod is prone to vibration due to the limited opening of the valve hole. Generally, the greater the water inlet pressure, the more likely the piston rod is to vibrate. The second O-ring can be compressed and deformed under the influence of water pressure. The greater the water pressure, the greater the compression and deformation of the sealing ring, and thus the greater the wrapping force on the piston rod, that is, the contact friction with the piston rod increases, thereby effectively preventing piston rod vibration.

[0008] Preferably, the water holes are formed between the two outer peripheries of the rod head and the lower end of the inner wall of the outer through hole.

[0009] Preferably, a stopper is provided for limiting the excessive downward movement of the piston rod to prevent the rod head from falling out from below the valve hole, thereby preventing the piston rod from excessively moving downward due to the influence of water pressure.

[0010] Preferably, the piston rod is provided with the limiting member on the circumferential surface above the rod head, and the blocking portion of the bottom wall of the water inlet chamber abuts against the bottom surface of the limiting member to limit the downward movement of the piston rod, and the elastic member is located between the top wall of the water inlet chamber and the upper surface of the limiting member.

[0011] Preferably, the valve housing further comprises a silencer chamber corresponding to a position below the valve hole, connecting the valve hole and the water outlet via the silencer chamber. The silencer chamber is spaced apart above the negative pressure diaphragm, and the piston rod movably passes through the silencer chamber. By adding the silencer chamber below the valve hole, water first generates noise when passing through the valve hole, then passes through the silencer chamber for noise reduction before flowing out of the water outlet. Furthermore, because the silencer chamber is spaced apart above the negative pressure diaphragm, there is a distance between the chamber and the negative pressure diaphragm. The noise is then reduced significantly by the silencer chamber and then propagates outward through the atmospheric cavity below.

[0012] Preferably, the muffler chamber is formed by a muffler box arranged below the valve hole, the muffler box is arranged at the upper part of the negative pressure chamber, and a movable hole for the piston rod to pass through is also provided at the bottom of the muffler box.

[0013] Preferably, the outer periphery of the muffler box and the side opposite to the upper wall of the negative pressure chamber are provided with an annular flange and groove arranged in the circumferential direction, and a positioning strip and positioning groove arranged in the axial direction, respectively. The flange and the groove cooperate to realize the axial positioning of the muffler box, and the positioning strip and the positioning groove cooperate to realize the circumferential positioning of the muffler box. The muffler box is easy to install and is not easy to shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a specific embodiment of the utility model;

[0015] Figure 2 This is a diagram of the internal structure of a specific embodiment of the utility model;

[0016] Figure 3 This is a structural diagram of one side of the water hole in a specific embodiment of the utility model;

[0017] Figure 4 This is a diagram showing the internal structure of a valve housing according to a specific embodiment of the present invention;

[0018] Figure 5 This is a structural diagram of one side of the negative pressure chamber of a specific embodiment of the utility model;

[0019] Figure 6 This is a structural diagram of a muffler box according to a specific embodiment of the present utility model;

[0020] Figure 7This is a structural diagram of the piston rod of a specific embodiment of the utility model.

[0021] In the figure: valve housing 1, water inlet 2, water extraction port 3, valve hole 4, piston rod 5, negative pressure diaphragm 6, water inlet chamber 11, negative pressure chamber 12, atmospheric chamber 13, elastic member 7, external through hole 8, rod head 1 51, rod head 2 52, O-ring 1 91, O-ring 2 92, sealing groove 9, water passage hole 10, limit member 14, stopper 111, muffler chamber A, muffler box B, movable hole B1, flange C1, groove C2, positioning strip D1, positioning groove D2. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] like Figure 1-7 As shown, a negative pressure water suction valve of the present invention comprises a valve housing 1, a water inlet 2 and a water pumping port 3 on the valve housing 1, a valve hole 4, a piston rod 5 which can slide up and down, and a negative pressure diaphragm 6 located below the valve hole 4, wherein the valve hole 4 is a tapered valve hole, and the inner cavity of the valve housing is further divided into: a water inlet chamber 11 located above the valve hole 4 and communicated with the side water inlet 2, a negative pressure chamber 12 located between the valve hole 4 and the negative pressure diaphragm 6 and communicated with the water pumping port 3, and an atmospheric chamber 13 located below the negative pressure diaphragm 6 and communicated with the outside world. The bottom of the valve housing has an air hole connected to the atmospheric chamber 13. When pumping water, negative pressure will be generated in the negative pressure chamber 12, and the upward deformation displacement of the negative pressure diaphragm 6 can drive the piston rod 5 upward to open the valve hole 4. The piston rod 5 is also driven by the elastic member 7. It is reset downward to block the valve hole 4. The elastic member 7 can be a spring or a spring. An external through hole 8 is also opened on the top of the valve housing 1, and the external through hole 8 is connected to the outside. The piston rod 5 has a rod head 51 that is inserted into the valve hole 4 at the lower end of the water inlet chamber, and a rod head 2 52 that is inserted into the external through hole 8 at the upper end of the water inlet chamber. The rod head 1 51 is provided with an O-ring 91 that can form a sealing fit with the inner wall of the valve hole 4. The rod head 2 52 is also sealed with the external through hole 8 by an O-ring 2 92. The piston rod 5 is a non-uniform diameter structure, and the outer diameter of its rod head 1 51 is larger than that of the rod head 2 52, and the outer diameter of the O-ring 1 91 protruding outward on the rod head 1 is larger than that of the rod head 2 52 to form a pressure area difference, thereby realizing that the piston rod 5 has the force to move downward under the water pressure.

[0024] Specifically, the inner wall of the outer through hole 8 includes a sealing groove 9. The second O-ring 92 is inserted into the sealing groove 9 and seals against the circumference of the second rod head 52. The chamber formed by the outer periphery of the second rod head and the sealing groove is also connected to the water inlet chamber 11 via a water hole 10. Under water pressure, the second O-ring 92 deforms and grips the piston rod 5. The water hole 10 is formed between the outer periphery of the second rod head 52 and the lower end of the inner wall of the outer through hole 8. Alternatively, the water hole 10 can be formed directly in the sealing groove.

[0025] Specifically, a stopper 14 is provided to limit excessive downward movement of the piston rod 5, thereby preventing the rod head 51 from slipping out from below the valve hole 4. The piston rod 5 is provided with the stopper 14 on its circumferential surface above the rod head 51. The stopper 14 and the piston rod 5 may be integral or separate structures. A stopper 111 on the bottom wall of the water inlet chamber 11 abuts the bottom surface of the stopper 14 to limit downward movement of the piston rod 5. The stopper 111 is a protrusion integrally provided on the bottom wall of the water inlet chamber 11, and has multiple stoppers spaced apart around the periphery of the valve hole. The elastic member 7 is a spring, located between the top wall of the water inlet chamber 11 and the upper surface of the stopper 14.

[0026] Specifically, the valve housing 1 further includes a silencer chamber A below the valve hole 4, connecting the valve hole 4 and the water outlet 3. The silencer chamber A is spaced apart above the negative pressure diaphragm 6, and the piston rod 5 movably passes through the silencer chamber A. The silencer chamber A is formed by a silencer box B surrounding the valve hole 4. The silencer box B is positioned above the negative pressure chamber 12, and the bottom of the silencer box B includes a movable hole B1 for the piston rod 5 to pass through. The negative pressure chamber 12 is connected to the water outlet 3 either directly or via the silencer chamber A. A gap exists between the outer periphery of the piston rod 5 and the inner wall of the movable hole B1, allowing the silencer chamber A to communicate with the negative pressure chamber 12, or alternatively, the silencer box B includes a hole that communicates with the negative pressure chamber 12.

[0027] Specifically, the outer periphery of the muffler box B has an annular flange C1 and a groove C2 arranged circumferentially, and a positioning strip D1 and a positioning groove D2 arranged axially on the opposite side of the upper cavity wall of the negative pressure chamber 12. The flange C1 and the groove C2 cooperate to achieve axial positioning of the muffler box B, and the positioning strip D1 and the positioning groove D2 cooperate to achieve circumferential positioning of the muffler box B. The flange C1 and the positioning strip D1 are fixed or integrally provided on the muffler box B or the negative pressure chamber 12. The muffler box B can also be connected to the valve housing 1 by screws or snaps.

[0028] Working principle:

[0029] When the pump is applied to the water outlet 3, negative pressure is generated in the water outlet chamber 12, while the atmospheric pressure in the atmospheric chamber 13 is maintained. This causes the negative pressure diaphragm 6 to deform upward, driving the piston rod 5 upward to open the valve hole 4, allowing water to be pumped. The water now flows from the water inlet 2 into the water inlet chamber 11, then passes through the valve hole 4, the muffler chamber A, and finally out of the water outlet 3.

[0030] Water flowing through the valve hole 4 will generate noise, which will then be silenced by the silencer chamber A before flowing out from the water outlet 3 with reduced noise. In addition, since the silencer chamber A is spaced above the negative pressure diaphragm 6 and there is a distance between it and the negative pressure diaphragm 6, the noise will be greatly reduced after being silenced by the silencer chamber A and then transmitted outward through the atmospheric cavity 13 below.

[0031] During flow-limited pumping: the valve hole 4 has a limited opening, and the piston rod 5 is prone to vibration, but the water in the water inlet chamber 11 can flow in through the water hole 10, thereby squeezing the O-ring 2 92 in the chamber, causing it to be compressed and deformed inward. The greater the water pressure, the greater the compression and deformation of the O-ring 2 92, and thus the greater the wrapping force on the piston rod 5, that is, the contact friction with the piston rod 5 becomes greater, thereby effectively preventing the piston rod 5 from vibrating.

[0032] When water enters from the side water inlet 2, the water pressure in the water inlet chamber 11 will generate forces on the piston rod 5 in two directions: the outward through hole 8 and the valve hole 4. Under the action of water pressure, since the piston rod 5 is a non-uniform diameter structure and there is a difference in pressure area, the pressure it bears will be different. The downward force acting on the piston rod 5 is greater than the upward force. The pressure difference force in the upper and lower directions can drive the piston rod 5 to move downward, and this force will increase with the increase of water pressure. In the process of increasing water pressure, it can also drive the piston rod 5 downward to facilitate closing the water outlet 4; when the water pressure is low and the pressure difference force acting on the piston rod 5 is small, the elastic member 7 assists the piston rod 5 to close the valve hole 4 downward.

[0033] When water stops flowing: when the negative pressure disappears, the negative pressure diaphragm 6 returns to its position, and the piston rod 5 is driven downward by the elastic member 7 to block the valve hole 4. At this time, the combined force of the pressure difference force and the elastic force of the elastic member 7 is much greater than the friction force of the O-ring 2 92 on the piston rod 5, so that the piston rod 5 can move downward reliably.

[0034] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "coupled," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

Claims

1. A negative pressure water suction valve, comprising a valve housing (1), a water inlet (2) and a water extraction port (3), wherein the valve housing (1) is provided with a valve hole (4), a piston rod (5) that can slide up and down, and a negative pressure diaphragm (6) located below the valve hole (4), and the inner cavity of the valve housing is further divided into: a water inlet chamber (11) located above the valve hole (4) and communicating with the side water inlet (2), a negative pressure chamber (12) located between the valve hole (4) and the negative pressure diaphragm (6) and communicating with the water extraction port (3), and an atmospheric chamber (13) located below the negative pressure diaphragm (6) and communicating with the outside world, wherein the piston rod (5) is driven upward by the upward deformation displacement of the negative pressure diaphragm (6) to open the valve hole (4), and the piston rod (5) is also driven downward by the elastic member (7) to reset to block the valve hole (4), characterized in that: The valve housing (1) is also provided with an external through hole (8) on the top. The piston rod (5) comprises a rod head (51) which is arranged at the valve hole (4) at the lower end of the water inlet chamber, and a rod head (52) which is arranged in the external through hole (8) at the upper end of the water inlet chamber. The rod head (51) is provided with an O-type sealing ring (91) which can form a sealing fit with the inner wall of the valve hole (4). The rod head (52) is also sealed with the external through hole (8) by the O-type sealing ring (92). The piston rod (5) is of a non-uniform diameter structure, and the outer diameter of the rod head (51) is larger than that of the rod head (52). The outer diameter of the O-type sealing ring (91) protruding outward on the rod head (51) is larger than that of the rod head (52), forming a pressure area difference, thereby realizing that the piston rod (5) has a downward movement force under the water pressure state.

2. A negative pressure water suction valve according to claim 1, characterized in that: The inner peripheral wall of the outer through hole (8) is provided with a sealing groove (9), and the second O-type sealing ring (92) is installed in the sealing groove (9) and is in sealing contact with the peripheral surface of the second rod head (52). The chamber formed by the outer periphery of the second rod head and the sealing groove is also connected to the water inlet chamber (11) through the water hole (10). The second O-type sealing ring (92) can be deformed and hold the piston rod (5) tightly under the water pressure.

3. A negative pressure water suction valve according to claim 2, characterized in that: The outer periphery of the second rod head (52) and the lower end of the inner wall of the outer through hole (8) are spaced apart to form the water hole (10).

4. A negative pressure water suction valve according to claim 1, 2 or 3, characterized in that: A limiting member (14) is also provided for limiting the excessive downward movement of the piston rod (5) to prevent the rod head (51) from falling out from below the valve hole (4).

5. The negative pressure water suction valve according to claim 4, characterized in that: The piston rod (5) is provided with the limiting member (14) on the circumferential surface located above the rod head, and the blocking portion (111) on the bottom wall of the water inlet chamber (11) abuts against the bottom surface of the limiting member (14) to limit the downward movement of the piston rod (5), and the elastic member (7) is located between the top wall of the water inlet chamber (11) and the upper surface of the limiting member (14).

6. A negative pressure water suction valve according to claim 1, 2 or 3, characterized in that: The valve housing (1) further comprises a silencer chamber (A) below the valve hole (4), the silencer chamber (A) communicating with the valve hole (4) and the water extraction port (3). The silencer chamber (A) is spaced apart above the negative pressure diaphragm (6), and the piston rod (5) movably penetrates the silencer chamber (A).

7. The negative pressure water suction valve according to claim 6, characterized in that: The muffler chamber (A) is formed by a muffler box (B) arranged below the valve hole (4). The muffler box (B) is arranged at the upper part of the negative pressure chamber (12). The bottom of the muffler box (B) also has a movable hole (B1) for the piston rod (5) to pass through.

8. The negative pressure water suction valve according to claim 7, characterized in that: The outer periphery of the muffler box (B) and the side opposite to the upper cavity wall of the negative pressure cavity (12) respectively have an annular flange (C1) and a groove (C2) arranged in the circumferential direction, and a positioning strip (D1) and a positioning groove (D2) arranged in the axial direction. The axial positioning of the muffler box (B) is achieved by the matching and locking arrangement of the flange (C1) and the groove (C2), and the circumferential positioning of the muffler box (B) is achieved by the matching and locking arrangement of the positioning strip (D1) and the positioning groove (D2).

Images