Water pump control valve

Abstract

This invention relates to the field of valve technology, and proposes a water pump control valve with a reasonable structural design that does not increase the difficulty of manufacturing process and can alleviate water hammer damage to the valve body and valve plate. The valve includes a valve body, a valve stem, and a valve plate. The valve body has a valve port located between the inlet and outlet ends. The valve plate is closable at the valve port. The upper end of the valve stem is sealed and fixedly connected to the piston in the piston seat, and the lower end is fixedly connected to the valve plate. An expansion body is provided on the inlet end of the valve body, forming an expansion cavity. A connecting pipe communicating with the expansion cavity and used for installing the expansion body is provided on the expansion body. The fixed end of the connecting pipe is fixedly installed on the expansion body. The valve body has an opening on the inlet end for the medium to flow through. The connecting end of the connecting pipe is detachably and sealedly inserted into the opening. An installation structure is provided on the outer wall of the connecting pipe. A water hammer prevention device is provided between the expansion body and the valve plate.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a water pump control valve. Background Technology

[0002] The water pump control valve is a multi-functional valve that controls flow rate using a pilot-operated method. The piston-type water pump control valve mainly consists of a valve body, valve stem, valve cover, piston seat, piston, valve plate, and bypass pipe. The valve body has a channel for the medium to flow through, with the inlet and outlet ends respectively. A valve port is located in the channel within the valve body, and the valve plate is located at the valve port. The valve cover and piston seat together form a sealed cavity. The piston is fixed to the upper end of the valve stem and divides the sealed cavity into an upper and lower cavity. The lower end of the valve stem is fixed to the valve plate. The piston drives the valve plate along the valve stem, thereby opening and closing the valve port. The inlet end is connected to the lower cavity through a first bypass pipe, and the outlet end is connected to the upper cavity through a second bypass pipe. During operation, water pressure pushes the piston to adjust the volume of the upper and lower cavities, thereby regulating the pressure difference between the inlet and outlet ends. This achieves automatic flow balance without the need for electricity, and simultaneously enables multi-functional control of the water pump outlet, including slow opening, full opening, slow closing, and shut-off. After the valve plate closes the valve port of the water pump control valve, the water pressure at the inlet end will generate a large water hammer impact force. The water hammer and the valve plate will form a counter-impact, which can easily damage the valve plate or valve body.

[0003] Water hammer is a problem that valve manufacturers have been working to solve. This case arose in order to alleviate the water hammer problem and reduce its impact on the valve body and valve plate. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention proposes a water pump control valve with a reasonable structural design, which does not increase the difficulty of manufacturing process and can alleviate the damage of water hammer to valve body and valve plate.

[0005] To solve the above-mentioned technical problems, the solution adopted by the present invention is as follows: a water pump control valve, including a valve body, a valve cover, a piston seat, a piston, a valve stem, and a valve plate. The valve body has a channel for the medium to flow through, with the two ends of the channel being an inlet and an outlet, respectively. The valve cover and the piston seat form a sealed cavity. The piston is slidably disposed within the piston seat, and the piston divides the sealed cavity into an upper cavity and a lower cavity. A first bypass pipe is provided between the inlet and lower cavity of the valve body, and a second bypass pipe is provided between the outlet and upper cavity of the valve body. A valve port is opened between the inlet and outlet of the valve body. The valve plate is openable and closable at the valve port. The upper end of the valve stem is sealed and fixedly connected to the piston within the piston seat, and the lower end is fixedly connected to the valve plate. The inlet end of the valve body is provided with a function to expand the inlet cavity formed between the valve body and the valve plate at the inlet end and relieve the pressure in the inlet cavity when the valve plate is closed. An expansion body designed to mitigate water hammer is provided. The expansion body has an internal expansion cavity. A connecting pipe, connected to the expansion cavity and used for mounting the expansion body, is provided on the expansion body. The fixed end of the connecting pipe is fixedly mounted on the expansion body. An opening for media flow is provided on the inlet end of the valve body. The connecting end of the connecting pipe is detachably and sealed within the opening. An installation structure is provided on the outer wall of the connecting pipe for detachably mounting the connecting pipe onto the valve body. A mechanism is provided between the expansion body and the valve plate, moving between the expansion cavity and the connecting pipe as the valve plate opens and closes. After the valve plate closes the valve port, the inlet cavity is connected to the expansion cavity, allowing media to enter the expansion cavity to mitigate the impact of water hammer on the valve body and valve plate. When the valve plate initially opens and connects the inlet and outlet ends, the media in the expansion cavity is simultaneously discharged. After the valve plate opens, the connection between the inlet cavity and the expansion cavity is blocked to avoid affecting the piston's pressure differential regulation between the inlet and outlet ends.

[0006] A further improvement is made to the waterproof hammer device, which includes a rubber ball, a sealing ball, a connecting rope, and a sealing guide sleeve, all capable of expanding to fill with or contracting to discharge the medium under water pressure. The rubber ball is disposed within the expansion cavity, and the expansion body has several vent holes communicating with the outside. The opening of the rubber ball is fitted onto the outer wall of the connecting end of the connecting pipe. The sealing guide sleeve is fitted onto the connecting end of the connecting pipe, with its outer wall sealingly fitting against the inner wall of the opening. The sealing guide sleeve has a sealing slot for the connecting end of the connecting pipe and the opening end of the rubber ball to be inserted. The inner wall of the sealing slot presses and fixes the rubber ball against the inner wall of the connecting pipe, and the free end extends into the expansion cavity to form a sealing guide sleeve. One end of the connecting rope is fixedly set at the lower end of the valve stem, and the other end is set on the sealing ball. The sealing ball is set in the sealing guide sleeve and the rubber ball. The sealing ball can fit and seal against the inner wall of the sealing guide sleeve. The sealing ball moves with the valve stem to block the communication between the water inlet cavity and the expansion cavity or to connect the water inlet cavity and the expansion cavity. The fixed end of the sealing guide sleeve is provided with a limiting structure to prevent the sealing ball from detaching.

[0007] A further improvement is that the limiting structure includes a limiting ring, which is disposed on the inner wall of the fixed end of the sealing guide sleeve, and the inner diameter of the limiting ring is smaller than the diameter of the sealing ball.

[0008] A further improvement is that the outer surface of the sealing ball and the inner wall of the sealing guide sleeve are both smooth surfaces.

[0009] A further improvement is that the mounting structure includes a mounting boss located circumferentially in the middle of the connecting pipe, the mounting boss having a plurality of first threaded mounting holes, and the valve body having a second threaded mounting hole that mates with the first threaded mounting holes, and fastening bolts being detachably installed in the first threaded mounting holes and the second threaded mounting holes.

[0010] A further improvement is that the outer wall of the sealing slot of the sealing guide sleeve is provided with a locking boss at one end of the outer wall of the valve body, which engages with the outer wall of the valve body to restrict the movement of the sealing guide sleeve into the valve body. The mounting boss is provided with a pressing groove on the end face of the mounting boss on one side of the valve body, into which the locking boss extends and presses against the valve body.

[0011] A further improvement is that the expansion body is located at the lower end of the valve body, and the lower end of the valve body is provided with support and protection blocks on the inlet and outlet ends on both sides of the expansion body to support the valve body, prevent the expansion body from bearing the weight of the valve body, and protect the expansion body from impact.

[0012] A further improvement is that the shape of the expander is spherical.

[0013] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: 1. In this design, an expansion body is used to increase the capacity of the inlet chamber after the valve plate is closed, thereby reducing the water pressure at the inlet end, mitigating water hammer, and protecting the valve. When the valve plate is open, the expansion chamber and the inside of the valve are blocked from communicating with each other by the sealing balls, without affecting the automatic control of the valve plate by the piston and piston seat. The overall structure of the design is simple and does not require an additional power source to drive the movement of the sealing balls.

[0014] 2. In this case, the sealing ball, used to connect or block the inlet chamber and the expansion chamber, is driven by the valve stem. It moves accordingly with the rise and fall of the valve stem. The pulling distance between the sealing ball and the bottom of the valve stem (or the center of the bottom of the valve plate) is greater than the distance from the bottom of the valve stem (or the center of the bottom of the valve plate) to the fixed end of the connecting pipe when the valve plate leaves the valve port and initially connects the inlet and outlet ends. When the valve stem rises to its highest position, the moving ball is located near the limit ring; when the valve stem rises and the valve plate initially opens, the sealing ball is located at the opening of the expansion chamber and does not block the connection between the inlet chamber and the expansion chamber; when the valve stem continues to rise to a distance from the valve port, the sealing ball is located on the sealing guide sleeve, blocking the connection between the inlet chamber and the expansion chamber. That is, the length of the sealing guide sleeve is constrained by the range of motion of the valve plate. After the valve plate closes, the medium in the inlet chamber enters the rubber ball under pressure, causing the rubber ball to expand. The maximum capacity of the rubber ball is constrained by the expansion body, which limits the expansion volume of the rubber ball while preventing it from expanding too much and damaging it. Within 0-5mm of the valve plate leaving the valve port, the medium inside the rubber ball is discharged from the rubber ball into the valve interior due to the contraction of the rubber ball and the decrease in water pressure in the inlet chamber, preparing for the expansion effect when the valve plate closes again.

[0015] 3. The connecting tube and the rubber ball's port are inserted into the sealing slot of the sealing guide sleeve, thus fixing the rubber ball in place and simultaneously sealing the connecting tube and the sealing guide sleeve. The inner wall of the sealing guide sleeve is smooth, fitting snugly against the smooth sealing ball to achieve a seal. As the sealing ball slides within the sealing guide sleeve, it creates a vacuum inside the rubber ball. Because the rubber ball is flexible, it adapts well to the movement of the sealing ball. The vent holes on the expansion body also effectively accommodate the deformation of the rubber ball. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the water pump control valve according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of the water pump control valve after the valve plate closes the valve port in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of the valve plate at the initial opening of the valve port in the water pump control valve of this embodiment of the invention.

[0019] Figure 4 This is a schematic diagram of the internal structure of the valve plate opening valve port in the water pump control valve of this embodiment of the invention.

[0020] Figure 5 yes Figure 2 Enlarged view of the local structure at point A in the middle.

[0021] Figure 6 yes Figure 3 Enlarged view of the local structure at point B.

[0022] Figure 7 yes Figure 4 Enlarged view of the local structure at point C. Detailed Implementation

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] refer to Figures 1 to 7The present invention discloses a water pump control valve, including a valve body 10, a valve cover 11, a piston seat 12, a piston 13, a valve stem 14, and a valve plate 15. The valve body 10 has a channel for the flow of a medium, with an inlet 16 and an outlet 17 at its two ends. The valve cover 11 and the piston seat 12 form a sealed cavity. The piston 13 is slidably disposed within the piston seat 12, dividing the sealed cavity into an upper cavity and a lower cavity. A first bypass pipe 18 connects the inlet 16 of the valve body 10 to the lower cavity, and a second bypass pipe 19 connects the outlet 17 of the valve body 10 to the upper cavity. On / off valves for controlling the opening and closing of the bypass pipes are respectively provided on the first bypass pipe 18 and the second bypass pipe 19. The valve body 10 is located at the inlet 16. A valve port 20 is provided between the valve body 10 and the outlet 17. The valve plate 15 is openable and closable at the valve port 20. The upper end of the valve stem 14 is sealed and fixedly connected to the piston 13 inside the piston seat 12, and the lower end is fixedly connected to the valve plate 15. An expansion body 21 is provided on the inlet end 16 of the valve body 10 to expand the inlet cavity formed between the valve body 10 and the valve plate 15 when the valve plate 15 is closed, thereby relieving the pressure in the inlet cavity and alleviating the water hammer problem. The expansion body 21 is provided at the lower end of the valve body 10. A support protection block 22 is integrally provided on the inlet end 16 and the outlet end 17 on both sides of the expansion body at the lower end of the valve body 10 to support the valve body 10, prevent the expansion body 21 from bearing the weight of the valve body 10, and protect the expansion body 21 from impact. The expansion body 21 is spherical in shape, and a circular expansion cavity 8 is formed inside the expansion body 21. A connecting pipe 23 connected to the expansion cavity 8 and used for installing the expansion body 21 is provided on the expansion body 21. The fixed end of the connecting pipe 23 is fixedly provided on the expansion body 21. An opening 24 for medium to flow through is opened on the inlet end 16 of the valve body 10. The connecting end of the connecting pipe 23 is detachably and sealedly inserted into the opening 24. An installation structure for detachably installing the connecting pipe 23 onto the valve body 10 is provided on the outer wall of the connecting pipe 23. The installation structure includes an installation boss 25 integrally provided circumferentially in the middle of the connecting pipe 23. A plurality of first threaded mounting holes are opened on the installation boss 25. A second threaded mounting hole that mates with the first threaded mounting hole is opened on the valve body 10. Fastening bolts 26 are detachably installed in the first threaded mounting hole and the second threaded mounting hole.

[0025] A water hammer prevention device is provided between the expansion body 21 and the valve plate 15, which moves between the expansion cavity 8 and the connecting pipe 23 as the valve plate 15 opens and closes. After the valve plate 15 closes the valve port 20, the water inlet cavity is connected to the expansion cavity 8 to allow the medium to enter the expansion cavity 8, thereby mitigating the impact of water hammer on the valve body 10 and the valve plate 15. When the valve plate 15 is initially opened to connect the water inlet end 16 and the water outlet end 17, the medium in the expansion cavity 8 is discharged synchronously. After the valve plate 15 is opened, the connection between the water inlet cavity and the expansion cavity 8 is blocked to avoid affecting the pressure difference regulation between the water inlet end 16 and the water outlet end 17 by the piston 13.

[0026] The waterproof hammer device includes a rubber ball 27 that expands with water pressure to fill in the medium or contracts to discharge the medium, a sealing ball 28, a connecting rope 29, and a sealing guide sleeve 30. The rubber ball 27 is disposed in the expansion cavity 8. The expansion body 21 has several vent holes communicating with the outside. The opening 24 of the rubber ball 27 is sleeved in reverse on the outer wall of the connecting end of the connecting pipe 23. The sealing guide sleeve 30 is sleeved on the connecting end of the connecting pipe 23. A rubber sealing sleeve is provided on the inner wall of the opening 24 to ensure a tight seal between the sealing guide sleeve 30 and the valve body 10. The outer wall of the sealing slot 9 of the sealing guide sleeve 30, located at one end of the outer wall of the valve body 10, has an integrally formed engaging boss 31 that engages with the outer wall of the valve body 10 to restrict the movement of the sealing guide sleeve 30 into the valve body 10. The mounting boss 25, located on one side of the valve body 10, has a pressing groove 32 for the engaging boss 31 to extend into and press against the valve body 10. The sealing guide sleeve 30 has a sealing slot 9 for the connecting end of the connecting pipe 23 and the opening 24 end of the rubber ball 27 to be inserted. The inner wall of the sealing slot 9 presses and fixes the rubber ball 27 against the inner wall of the connecting pipe 23, and its free end extends into the expansion cavity 8 to form a sealing guide inner sleeve 33. The connecting rope 29 is a nylon rope, with one end fixed to the lower end of the valve stem 14 and the other end attached to the sealing ball 28. Threaded holes are respectively tapped on the lower end of the valve stem 14 and the sealing ball 28. A threaded rod 34 is fixedly connected to the threaded hole, and an annular ring 35 is integrally formed on the threaded rod. The end of the nylon rope is wound around the annular ring. The sealing ball 28 is a steel ball, disposed within the sealing guide sleeve 30 and the rubber ball 27. The sealing ball 28 can fit snugly against the inner wall of the sealing guide sleeve 30 to seal against the medium entering the rubber ball 27. The sealing ball 28 moves with the valve stem 14, either blocking the connection between the inlet chamber and the expansion chamber 8 or connecting them. A limiting structure is provided on the fixed end of the sealing guide inner sleeve 33 to restrict the detachment of the sealing ball 28. The limiting structure includes a limiting ring 36, which is integrally formed on the inner wall of the fixed end of the sealing guide sleeve 30. The inner diameter of the limiting ring 36 is smaller than the diameter of the sealing ball 28. The outer surface of the sealing ball 28 and the inner wall of the sealing guide inner sleeve 33 are both smooth surfaces.

[0027] Operating instructions for the water pump control valve: When the valve is closed, the valve plate 15 moves to the valve port 20 position. At this time, the sealing steel ball is located inside the rubber ball 27, and the valve's inlet chamber is connected to the expansion chamber 8. The medium enters the rubber ball 27 along the sealing guide sleeve 33, expanding the rubber ball 27 to reduce the pressure in the inlet chamber, alleviate water hammer, and protect the valve. When the valve plate 15 initially opens, the medium in the inlet chamber begins to flow into the outlet 17, reducing the pressure in the inlet chamber. The medium inside the rubber ball 27 is discharged due to the reduced pressure in the inlet chamber and its own elastic contraction force. After the valve is fully opened and during automatic adjustment of the pressure difference between the inlet 16 and the outlet 17, the sealing ball 28 is located inside the sealing guide sleeve 33, blocking the connection between the inlet chamber and the expansion chamber 8 and preventing the medium from entering the rubber ball 27, thus avoiding affecting the valve's automatic adjustment of the pressure difference between the inlet 16 and the outlet 17.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A water pump control valve, comprising a valve body, a valve cover, a piston seat, a piston, a valve stem, and a valve plate, wherein the valve body has a channel for medium flow, the two ends of the channel being an inlet and an outlet respectively, the valve cover and the piston seat forming a sealed cavity, the piston being slidably disposed within the piston seat, the piston dividing the sealed cavity into an upper cavity and a lower cavity, a first bypass pipe being provided connecting the inlet and lower cavity of the valve body, and a second bypass pipe being provided connecting the outlet and upper cavity of the valve body, a valve port being provided between the inlet and outlet of the valve body, the valve plate being openable and closable at the valve port, the upper end of the valve stem being sealed and fixedly connected to the piston within the piston seat, and the lower end being fixedly connected to the valve plate, characterized in that: The valve body has an expansion body at its inlet end for expanding the inlet cavity formed between the valve body and the valve plate when the valve plate is closed, thereby relieving pressure in the inlet cavity and mitigating water hammer. The expansion body forms an expansion cavity, and a connecting pipe connected to the expansion cavity is provided on it for mounting the expansion body. The fixed end of the connecting pipe is fixedly mounted on the expansion body. The valve body has an opening at the inlet end for media flow, and the connecting end of the connecting pipe is detachably and sealed within the opening. The outer wall of the connecting pipe is... The valve body is equipped with an installation structure for detachably installing the connecting pipe onto the valve body. A device is provided between the expansion body and the valve plate that moves between the expansion chamber and the inside of the connecting pipe as the valve plate opens and closes. After the valve plate closes the valve port, the inlet chamber is connected to the expansion chamber to allow the medium to enter the expansion chamber to alleviate the impact of water hammer on the valve body and the valve plate. When the valve plate is initially opened and the inlet end is connected to the outlet end, the medium in the expansion chamber is discharged synchronously. After the valve plate is opened, the connection between the inlet chamber and the expansion chamber is blocked to avoid affecting the piston's adjustment of the pressure difference between the inlet end and the outlet end. The waterproof hammer device includes a rubber ball that expands with water pressure to fill in the medium or contracts to discharge the medium, a sealing ball, a connecting rope, and a sealing guide sleeve. The rubber ball is disposed within the expansion cavity, and the expansion body has several vent holes communicating with the outside. The opening of the rubber ball is fitted onto the outer wall of the connecting end of the connecting pipe in the opposite direction. The sealing guide sleeve is fitted onto the connecting end of the connecting pipe, and the outer wall of the sealing guide sleeve is sealed to the inner wall of the opening. The sealing guide sleeve has a sealing slot for the connecting end of the connecting pipe and the opening end of the rubber ball to be inserted. The inner wall of the sealing slot presses and fixes the rubber ball against the inner wall of the connecting pipe, and the free end extends into the expansion cavity to form a sealing guide sleeve. One end of the connecting rope is fixedly set at the lower end of the valve stem, and the other end is set on the sealing ball. The sealing ball is set in the sealing guide sleeve and the rubber ball. The sealing ball can fit and seal against the inner wall of the sealing guide sleeve. The sealing ball moves with the valve stem to block the communication between the water inlet cavity and the expansion cavity or to connect the water inlet cavity and the expansion cavity. The fixed end of the sealing guide sleeve is provided with a limiting structure to prevent the sealing ball from detaching.

2. The water pump control valve according to claim 1, characterized in that: The limiting structure includes a limiting ring, which is disposed on the inner wall of the fixed end of the sealing guide sleeve, and the inner diameter of the limiting ring is smaller than the diameter of the sealing ball.

3. The water pump control valve according to claim 1, characterized in that: The outer surface of the sealing ball and the inner wall of the sealing guide sleeve are both smooth surfaces.

4. The water pump control valve according to claim 1, 2, or 3, characterized in that: The mounting structure includes a mounting boss located circumferentially in the middle of the connecting pipe. The mounting boss has a plurality of first threaded mounting holes. The valve body has a second threaded mounting hole that mates with the first threaded mounting holes. Fastening bolts are detachably installed in the first threaded mounting holes and the second threaded mounting holes.

5. The water pump control valve according to claim 4, characterized in that: The outer wall of the sealing slot of the sealing guide sleeve is provided with a locking boss at one end of the outer wall of the valve body, which engages with the outer wall of the valve body to restrict the movement of the sealing guide sleeve into the valve body. The end face of the mounting boss on one side of the valve body is provided with a pressing groove for the locking boss to extend into and press against the valve body.

6. The water pump control valve according to claim 1, 2, 3, 4, or 5, characterized in that: The expansion body is located at the lower end of the valve body. The lower end of the valve body is provided with support and protection blocks on the inlet and outlet ends on both sides of the expansion body to support the valve body, prevent the expansion body from bearing the weight of the valve body, and protect the expansion body from impact.

7. The water pump control valve according to claim 1, 2, 3, 4, or 5, characterized in that: The expander is spherical in shape.

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