Negative pressure water suction valve

Abstract

The negative-pressure water suction valve comprises a valve shell part, 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 part, an inner cavity of the valve shell part is provided with a water inlet cavity, a negative-pressure cavity and an atmosphere cavity, the piston rod faces upwards so as to open the valve hole, the piston rod is further driven by an elastic part to reset downwards so as to block the valve hole, and 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 portion penetrating through a valve hole in the lower end of the water inlet cavity and a second rod head portion penetrating through an outer through hole in the upper end of the water inlet cavity, the first rod head portion is provided with a first O-shaped sealing ring capable of being in sealing fit with the inner wall of the valve hole, and the second rod head portion and the outer through hole are 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 invention relates to a negative pressure water suction valve. Background Art

[0002] General drinking water equipment is usually equipped with a water tank, which plays the role of water storage. However, the water tank is easily contaminated by bacteria. Therefore, a negative pressure valve is introduced, which can provide the required water flow to the drinking water heating system. The pressure at the water supply end is not limited. If there is no negative pressure at the water outlet, no water will be discharged. The negative pressure generated by the water pump draws water from the pressurized water supply end. If there is no negative pressure at the water outlet, the water outlet will stop immediately. The water flow rate is determined by the negative pressure at the water outlet (pump speed-flow rate). In this way, the water tank in the drinking water equipment can be replaced, and it can be fully sealed to prevent the drinking water from being contaminated by bacteria in the air.

[0003] A general negative pressure valve includes a valve body with a water inlet, a water outlet and a valve cavity therein, wherein the valve cavity is vertically opened in the valve body, 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 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 balance ring is provided at the head end, the inner side of the flexible balance 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 of water inlet at the water outlet, the elastic reset device resets the valve stem to control the closing of the water outlet, and when there is negative pressure of 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. 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 it cannot overcome the resistance to drive the valve stem to slide and reset to close the water outlet, resulting in the problem that the water outlet cannot be closed. Summary of the invention

[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 pressurization state.

[0005] The technical solution of the present invention is a negative pressure water suction valve, comprising a valve shell, a water inlet and a water pumping port, wherein 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 located above the valve hole and connected to the side water inlet, a negative pressure cavity located between the valve hole and the negative pressure diaphragm and connected to the water pumping port, and an atmospheric cavity located below the negative pressure diaphragm and connected to the outside world, the upward deformation displacement energy of the negative pressure diaphragm drives the piston rod upward to open the valve hole, and the piston rod is also driven by an elastic member to reset downward to block the valve hole, and the An external through hole is also opened on the top of the valve shell member, and the piston rod comprises a rod head 1 which is inserted into the valve hole at the lower end of the water inlet chamber, and a rod head 2 which is inserted into the external through hole at the upper end of the water inlet chamber. An O-ring 1 which can form a sealing fit with the inner wall of the valve hole is provided on the rod head 1, 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 the rod head 1 is larger than that of the rod head 2, so that 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 pressurization 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 forces 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-equal diameter structure and there is a pressure area difference, 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, the inner peripheral wall of the outer through hole is provided with a sealing groove, the second O-type sealing 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, and the second O-type sealing ring can be deformed and hold the piston rod tightly under the water pressure. When the flow is limited and the water is pumped, the piston rod is prone to vibration due to the limited opening of the valve hole; and generally, the greater the water inlet pressure, the easier the piston rod is to vibrate, and the second O-type sealing ring can be compressed and deformed under the influence of water pressure, and 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 becomes greater, thereby effectively avoiding the vibration of the piston rod.

[0008] Preferably, the water holes are formed at intervals between the two outer peripheries of the rod head and the lower ends of the inner walls of the outer through holes.

[0009] Preferably, a stopper is provided for limiting excessive downward movement of the piston rod to prevent the rod head from slipping out of the valve hole, thereby preventing the piston rod from excessive downward movement due to 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 also has a silencer cavity corresponding to the lower portion of the valve hole, the silencer cavity connects the valve hole and the water pumping port, the silencer cavity is arranged above the negative pressure diaphragm, and the piston rod also movably passes through the silencer cavity. When a silencer cavity is added below the valve hole, water first passes through the valve hole to generate noise, then passes through the silencer cavity for silencer treatment, and then flows out from the water pumping port; and because the silencer cavity is arranged above the negative pressure diaphragm, there is a distance between the silencer cavity and the negative pressure diaphragm, and the noise is silenced by the silencer cavity and then propagates outward through the lower atmospheric cavity, the noise will be greatly reduced.

[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 cavity wall of the negative pressure cavity respectively have an annular flange and a groove arranged in the circumferential direction, and a positioning strip and a positioning groove arranged in the axial direction, and the axial positioning of the muffler box is realized by the matching clamping of the flange and the groove, and the circumferential positioning of the muffler box is realized by the matching clamping of the positioning strip and the positioning groove. The muffler box is easy to install and not easy to shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural diagram of a specific embodiment of the present invention; Figure 2 It is an internal structure diagram of a specific embodiment of the present invention; Figure 3 It is a structural diagram of one side of the water hole in a specific embodiment of the present invention; Figure 4 It is a diagram showing the internal structure of a valve housing according to a specific embodiment of the present invention; Figure 5 This is a structural diagram of one side of the negative pressure chamber of a specific embodiment of the present invention; Figure 6 It is a structural diagram of a muffler box according to a specific embodiment of the present invention; Figure 7 This is a structural diagram of a piston rod according to a specific embodiment of the present invention.

[0015] In the figure: valve housing 1, water inlet 2, water suction 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 hole 10, limit member 14, stopper 111, silencer chamber A, silencer box B, movable hole B1, flange C1, groove C2, positioning strip D1, positioning groove D2. DETAILED DESCRIPTION

[0016] The technical scheme in this embodiment will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1-7 As shown, a negative pressure water suction valve of the present invention comprises a valve housing 1, the valve housing 1 is provided with a water inlet 2 and a water pumping port 3, the valve housing 1 is provided with 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, the valve hole 4 is a tapered valve hole, and the inner cavity of the valve housing is further divided into: a water inlet cavity 11 located above the valve hole 4 and connected to the side water inlet 2, a negative pressure cavity 12 located between the valve hole 4 and the negative pressure diaphragm 6 and connected to the water pumping port 3, and an atmospheric cavity 13 located below the negative pressure diaphragm 6 and connected to the outside, and an air hole connected to the atmospheric cavity 13 is provided at the bottom of the valve housing. When pumping water, negative pressure will be generated in the negative pressure cavity 12, and then the upward deformation displacement energy of the negative pressure diaphragm 6 will drive the piston rod 5 upward to open the valve hole 4, and the piston rod 5 is also driven by the elastic member 7 to move upward The piston rod 5 is a kind of non-uniform structure, and the outer diameter of the rod head 51 is larger than that of the rod head 52, and the outer diameter of the O-ring 92 is larger than that of the rod head 52.

[0018] Specifically, the inner peripheral wall of the outer through hole 8 is provided with a sealing groove 9, 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, and the second O-type sealing ring 92 can be deformed and hold the piston rod 5 under the water pressure. 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 to form the water hole 10. Or the water hole 10 is directly formed on the sealing groove.

[0019] Specifically, a stopper 14 is provided for limiting excessive downward movement of the piston rod 5 to prevent the rod head 51 from slipping out from below the valve hole 4. The piston rod 5 is provided with the stopper 14 on the circumference above the rod head 1. The stopper 14 and the piston rod 5 are an integral or split structure. The stopper 111 of the bottom wall of the water inlet chamber 11 abuts against the bottom surface of the stopper 14 to limit the 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 a plurality of stoppers distributed at intervals on the outer periphery of the valve hole. The elastic member 7 is a spring, which is located between the top wall of the water inlet chamber 11 and the upper surface of the stopper 14.

[0020] Specifically, the valve housing 1 further comprises a silencer chamber A below the valve hole 4, and the silencer chamber A connects the valve hole 4 and the water pumping port 3. The silencer chamber A is arranged above the negative pressure diaphragm 6, and the piston rod 5 also movably penetrates the silencer chamber A. The silencer chamber A is formed by a silencer box B arranged below the valve hole 4, and the silencer box B is arranged at the upper part of the negative pressure chamber 12. The bottom of the silencer box B also comprises a movable hole B1 for the piston rod 5 to penetrate. The negative pressure chamber 12 is directly connected to the water pumping port 3, or is connected through the silencer chamber A. There is a gap between the outer periphery of the piston rod 5 and the inner wall of the movable hole B1, so that the silencer chamber A is connected to the negative pressure chamber 12, or the silencer box B also comprises a hole connected to the negative pressure chamber 12.

[0021] Specifically, the outer periphery of the muffler box B and the side opposite to the upper cavity wall of the negative pressure chamber 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 clamping of the flange C1 and the groove C2, and the circumferential positioning of the muffler box B is achieved by the matching and clamping of the positioning strip D1 and the positioning groove D2. The flange C1 and the positioning strip D1 are fixed or integrally arranged 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 buckles.

[0022] Working principle: When the water pumping port 3 is acted upon by the water pump, the water outlet chamber 12 generates negative pressure, and the atmospheric chamber 13 is at atmospheric pressure, so the negative pressure diaphragm 6 will deform and move upward, and drive the piston rod 5 to move upward to open the valve hole 4, so that water can be pumped. At this time, the water flows into the water inlet chamber 11 from the water inlet 2, and then passes through the valve hole 4, the muffler chamber A in sequence, and finally flows out from the water pumping port 3.

[0023] 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 suction port 3 with reduced noise. Also, since the silencer chamber A is spaced above the negative pressure diaphragm 6 and there is a distance between the silencer chamber A and the negative pressure diaphragm 6, the noise will be greatly reduced after being silenced by the silencer chamber A and then propagated outward through the atmospheric cavity 13 below.

[0024] 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 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 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.

[0025] 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, namely, 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 structure and there is a difference in pressure-bearing 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 the force will increase with the increase of water pressure. In the process of increasing water pressure, the piston rod 5 can also be driven 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 in closing the valve hole 4 downward.

[0026] 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.

[0027] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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) which 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 cavity (11) located above the valve hole (4) and communicating with the side water inlet (2), a negative pressure cavity (12) located between the valve hole (4) and the negative pressure diaphragm (6) and communicating with the water extraction port (3), and an atmospheric cavity (13) located below the negative pressure diaphragm (6) and communicating with the outside, wherein the piston rod (5) is driven upward by the upward deformation displacement energy of the negative pressure diaphragm (6) to open the valve hole (4), and the piston rod (5) is also driven by the elastic member (7) to reset downward to block the valve hole (4), characterized in that: The valve housing (1) also has an external through hole (8) on the top. The piston rod (5) comprises a rod head (51) which is inserted into the valve hole (4) at the lower end of the water inlet chamber, and a rod head (52) which is inserted into the external through hole (8) at the upper end of the water inlet chamber. The rod head (51) is provided with an O-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 an O-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-ring (91) protruding outward on the rod head (51) is larger than that of the rod head (52), so that a pressure area difference is formed, thereby realizing that the piston rod (5) has a downward movement force under water pressure.

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), the second O-ring (92) is inserted into 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), and the second O-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 through 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 excessive downward movement of the piston rod (5) to prevent the rod head (51) from falling out from below the valve hole (4).

5. A 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) also has a silencer chamber (A) below the valve hole (4), the silencer chamber (A) communicating with the valve hole (4) and the water pumping port (3), the silencer chamber (A) being spaced above the negative pressure diaphragm (6), and the piston rod (5) also movably passing through the silencer chamber (A).

7. A 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 penetrate.

8. A 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 clamping arrangement of the flange (C1) and the groove (C2), and the circumferential positioning of the muffler box (B) is achieved by the matching and clamping arrangement of the positioning strip (D1) and the positioning groove (D2).

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