Fluid valve and fluid diverter valve

Abstract

The fluid valve comprises a valve body and a valve rod, the valve body is provided with a fluid inlet, a fluid outlet and a valve rod reciprocating motion channel, the valve rod is located in the valve rod reciprocating motion channel and controls opening or closing of the fluid valve, and when the fluid valve is opened, fluid flows to the fluid outlet from the fluid inlet and flows out of the fluid valve. The valve further comprises a valve closing power automatic compensation channel, and the fluid inlet end of the valve closing power automatic compensation channel is communicated with fluid in the valve body. After the fluid valve is opened, fluid in the valve body flows from the fluid inlet end of the valve closing power automatic compensation channel to the fluid outlet end of the valve closing power automatic compensation channel under the pressure of the fluid and then applies acting force towards the valve closing movement direction of the valve rod to the valve rod. And after the fluid valve is closed, the fluid pressure at the fluid outlet end of the valve closing power automatic compensation channel is reduced. According to the fluid valve, external source driving force needed when the valve is closed can be reduced, and the valve is easy to open and close.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid inlet and outlet control, specifically a fluid valve and a fluid diverter valve. Background Art

[0002] In the prior art, the opening or closing of a fluid valve is controlled by the movement of a valve stem; however, when the fluid pressure is high, the plug of the valve stem is acted upon by the fluid pressure to cause the valve stem to move in the valve closing direction, which requires a large driving force; for a fluid valve that uses an air cylinder or a hydraulic cylinder to provide the valve closing power, under the condition of the same gas or liquid pressure, a larger diameter air cylinder or hydraulic cylinder is required to provide the corresponding valve closing driving force, and an increase in the diameter of the air cylinder or hydraulic cylinder will cause a sudden increase in the overall volume of the fluid valve, making it difficult to install and use in a small space, and greatly increasing the overall cost of the fluid valve.

[0003] For example, as people's requirements for environmental cleanliness increase, the water pressure of clean water sprayed by sanitation vehicles has increased from a few MPa to more than 30 MPa to achieve deep cleaning of the road surface; the opening and closing of the water valve is achieved by a cylinder. As the water pressure increases significantly, the driving force required to close the water valve increases significantly, which must be met by increasing the air source pressure or increasing the cylinder diameter. Increasing the air source pressure will increase the overall cost of sanitation vehicles and require existing sanitation vehicles to be modified and upgraded before they can be used. Increasing the cylinder diameter will make it impossible to use the sanitation vehicle within the limited installation space. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to provide a fluid valve and a fluid diverter valve which can reduce the external driving force required when closing the valve.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A fluid valve comprises a valve body and a valve stem, the valve body having a fluid inlet, a fluid outlet and a valve stem reciprocating motion channel, the valve stem is located in the valve stem reciprocating motion channel and controls the opening or closing of the fluid valve, when the fluid valve is opened, the fluid flows from the fluid inlet to the fluid outlet and flows out of the fluid valve, and is characterized in that it also comprises a valve closing power automatic compensation channel, the fluid inlet end of the valve closing power automatic compensation channel is connected to the fluid in the valve body; after the fluid valve is opened: the fluid in the valve body flows from the fluid inlet end of the valve closing power automatic compensation channel to the fluid outlet end of the valve closing power automatic compensation channel under the fluid's own pressure, and then applies a force to the valve stem in the direction of the valve stem closing valve movement; after the fluid valve is closed: the fluid pressure at the fluid outlet end of the valve closing power automatic compensation channel is reduced.

[0007] In the above-mentioned fluid valve, the fluid outlet end of the automatic valve closing power compensation channel is fluidly connected to the valve closing power compensation surface on the valve stem, and the fluid flowing out from the fluid outlet end of the automatic valve closing power compensation channel applies a force on the valve stem toward the valve stem's valve closing movement direction through the valve closing power compensation surface.

[0008] In the above-mentioned fluid valve, the two ends of the valve stem are respectively a valve closing sealing end and a valve closing power compensation end, and the valve stem reciprocates in the valve stem reciprocating motion channel so that the valve closing sealing end opens or closes the fluid inlet, the fluid outlet or the fluid channel between the fluid inlet and the fluid outlet; the valve closing power compensation surface is: the end face of the valve closing power compensation end, or the concave surface on the end face of the valve closing power compensation end, or the convex surface on the end face of the valve closing power compensation end, or any two of the end face of the valve closing power compensation end, the concave surface on the end face of the valve closing power compensation end and the convex surface on the end face of the valve closing power compensation end, or a combination of the three.

[0009] In the above-mentioned fluid valve, the valve closing dynamic compensation surface is a plane perpendicular to the movement direction of the valve stem.

[0010] In the above-mentioned fluid valve, a compression spring is installed between the valve closing power compensation end and the valve body, and the elastic force of the compression spring on the valve closing power compensation end is directed toward the valve closing movement direction of the valve stem.

[0011] The above-mentioned fluid valve is provided with a fluid prevention storage component between the compression spring and the valve closing power compensation surface, and the outlet of the fluid between the fluid prevention storage component and the valve closing power compensation surface is the valve closing power automatic compensation channel; after the fluid valve is closed, the elastic force of the compression spring drives the fluid prevention storage component to approach the valve closing power compensation surface so that the fluid between the fluid prevention storage component and the valve closing power compensation surface is discharged from the valve closing power automatic compensation channel.

[0012] The above-mentioned fluid valve has a power compensation blind hole on the end face of the closing valve power compensation end, the first end of the anti-fluid accumulation component is located in the power compensation blind hole, and the first end of the anti-fluid accumulation component is liquid-tightly sealed against the inner wall of the power compensation blind hole, and the bottom of the power compensation blind hole is the closing valve power compensation surface; the compression spring is located between the second end of the anti-fluid accumulation component and the valve body.

[0013] The above-mentioned fluid valve has a drainage blind hole on the second end face of the fluid prevention and storage component, and one end of the compression spring adjacent to the fluid prevention and storage component is located in the drainage blind hole; a guide hole is provided on the hole wall of the drainage blind hole, and the annular space between the fluid prevention and storage component and the valve stem reciprocating motion channel is fluid-connected to the drainage blind hole through the guide hole.

[0014] The above-mentioned fluid valve, after the fluid valve is closed: the fluid channel between the fluid inlet end of the valve closing power automatic compensation channel and the fluid in the valve body is disconnected.

[0015] In the above-mentioned fluid valve, the automatic valve closing power compensation channel is a through hole opened on the valve stem from the valve closing blocking end to the valve closing power compensation end.

[0016] In the above-mentioned fluid valve, a leak-proof pressure compensation surface is provided on the valve closing sealing end, and the pressure exerted on the leak-proof pressure compensation surface by the fluid in the valve body is in the valve closing movement direction of the valve stem.

[0017] The above-mentioned fluid valve has an independent one-way valve seat installed in the valve body, and the valve closing sealing end closes the fluid valve by pressing on the one-way valve seat. An anti-impact component is installed between the one-way valve seat and the valve body, and the anti-impact component presses the one-way valve seat in the valve closing movement direction of the valve stem.

[0018] In the above-mentioned fluid valve, the valve stem reciprocating motion channel includes a valve closing power compensation chamber, a valve closing power chamber and a fluid flow chamber, the valve closing power chamber is located between the valve closing power compensation chamber and the fluid flow chamber, and the valve closing power chamber and the valve closing power compensation chamber as well as the valve closing power chamber and the fluid flow chamber are fluid-sealed; the valve stem passes through the valve closing power chamber, and one end of the valve stem extends into the fluid flow chamber and the other end extends into the valve closing power compensation chamber; the fluid inlet and the fluid outlet are fluid-conducted through the fluid flow chamber; the valve closing power chamber includes a first valve closing power chamber and a second valve closing power chamber, and the first valve closing power chamber and the second valve closing power chamber are fluid-sealed by a driving piston fixedly installed on the valve stem; the driving piston is driven by filling the first valve closing power chamber or the second valve closing power chamber with fluid to drive the valve stem to move synchronously, so as to open or close the fluid valve.

[0019] In the above-mentioned fluid valve, a first sealing seat is installed between the valve closing power chamber and the fluid flow chamber, the outer circumference of the first sealing seat is liquid-tight with the inner wall of the valve stem reciprocating motion channel, the valve stem passes through the middle hole on the first sealing seat, and the outer circumference of the valve stem is liquid-tight with the inner wall of the middle hole on the first sealing seat; a first annular groove is provided on the outer circumference of the first sealing seat, and a first radial flow guide hole is provided in the first sealing seat, one end of the first radial flow guide hole is fluid-connected with the gap between the valve stem and the inner wall of the middle hole on the first sealing seat, one end of the first radial flow guide hole is fluid-connected with the first annular groove, a first liquid discharge hole is provided on the valve body, and a muffler is installed in the first liquid discharge hole; along the axial direction of the valve stem: there is at least one static sealing structure between the outer circumference of the first sealing seat on both sides of the first annular groove and the inner wall of the valve stem reciprocating motion channel, and there is at least one dynamic sealing structure between the outer circumference of the valve stem on both sides of the first radial flow guide hole facing the valve stem and the inner wall of the middle hole on the first sealing seat.

[0020] In the above-mentioned fluid valve, a second sealing seat is installed between the valve closing power compensation chamber and the valve closing power chamber, the outer peripheral surface of the second sealing seat and the inner wall of the valve stem reciprocating motion channel are liquid-tight, the valve stem passes through the middle hole on the second sealing seat, and the outer peripheral surface of the valve stem and the inner wall of the middle hole on the second sealing seat are liquid-tight; a second annular groove is provided on the outer peripheral surface of the second sealing seat, and a second radial guide hole is provided in the second sealing seat, one end of the second radial guide hole is connected to the valve stem and the inner wall of the middle hole on the second sealing seat The second radial guide hole is in fluid communication with the second annular groove, one end of the second radial guide hole is in fluid communication with the second annular groove, the valve body is provided with a second drainage hole in fluid communication with the second annular groove, and a muffler is installed in the second drainage hole; along the axial direction of the valve stem: there is at least one static sealing structure between the outer circumferential surface of the second sealing seat on both sides of the second annular groove and the inner wall of the valve stem reciprocating motion channel, and there is at least one dynamic sealing structure between the outer circumferential surface of the valve stem on both sides of the second radial guide hole facing the valve stem and the inner wall of the middle hole on the second sealing seat.

[0021] A fluid diverter valve comprises two or more of the above-mentioned fluid valves, wherein between two adjacent fluid valves: the upstream fluid valve is fluidly connected to the fluid inlet of the downstream fluid valve through a normally open fluid channel opened on the valve body.

[0022] The technical solution of the utility model has achieved the following beneficial technical effects:

[0023] 1. The fluid valve of the utility model can reduce the external driving force required when closing the valve, and is easy to close and open the valve.

[0024] 2. Providing a valve closing force compensation surface on the valve stem can accurately calculate the magnitude of the force applied to the valve stem in the direction of the valve stem closing movement, and is the simplest and easiest way to achieve the fluid flowing out of the fluid outlet end of the valve closing force automatic compensation channel applying a force on the valve stem in the direction of the valve stem closing movement, making the valve body structure simple, easy to process and produce, and reducing costs.

[0025] 3. Arranging the valve closing dynamic compensation surface at the valve closing dynamic compensation end makes it easier to apply force to the valve stem in the direction of the valve stem closing movement, and the fluid passage is simpler; it avoids loopholes being exploited by limiting only the end face, and avoids disputes when judging whether it is equivalent to infringement.

[0026] 4. The valve closing dynamic compensation surface is a plane perpendicular to the direction of valve stem movement, which is convenient for accurately calculating the force applied to the valve stem in the direction of valve stem closing movement.

[0027] 5. One end of the automatic compensation channel for closing the valve power is located on the end face of the closing valve blocking end. Closing the valve automatically closes the automatic compensation channel for closing the valve power. This cutting method is easy to implement, ensuring that the valve body structure is simple, easy to process and produce, and reduces costs.

[0028] The through hole provided in the valve stem as the automatic compensation channel for the valve closing power makes it easier for the fluid in the automatic compensation channel for the valve closing power to flow out instead of accumulating in the channel after the fluid valve is closed. On the other hand, it makes it easier to control the on and off of the automatic compensation channel for the valve closing power and ensures that the valve body has a simple structure, is easy to process and produce, and reduces costs.

[0029] 6. The design of the leak-proof pressure compensation surface is to prevent leakage at the outlet due to high water pressure. The anti-impact component can prevent the one-way valve seat from falling off due to excessive water pressure when the valve is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the internal structure of the first fluid valve of the utility model;

[0031] Figure 2 for Figure 1 The schematic diagram of the valve stem mounting structure of the fluid valve of the utility model is shown;

[0032] Figure 3 A schematic diagram of the internal structure of a second type of fluid valve of the utility model;

[0033] Figure 4 A schematic diagram of the internal structure of a third type of fluid valve of the utility model;

[0034] Figure 5 A schematic diagram of the external structure of the fluid diverter valve of the utility model.

[0035] The reference numerals in the figure are as follows:

[0036] 1-valve body; 1-1-body; 1-3-valve stem mounting body; 1-4-first drainage hole; 1-5-second drainage hole;

[0037] 2-valve stem; 2-1-valve closing plugging end; 2-2-valve closing power compensation end; 2-3-leakage-proof pressure compensation surface; 2-4-power compensation blind hole;

[0038] 3- driving piston;

[0039] 4-valve stem reciprocating motion channel; 4-1-valve closing power compensation chamber; 4-2-valve closing power chamber; 4-21-first valve closing power chamber; 4-22-second valve closing power chamber; 4-3-fluid flow chamber;

[0040] 5-valve closing power automatic compensation channel;

[0041] 6-fluid inlet; 7-fluid outlet; 8-valve closing dynamic compensation surface; 9-compression spring; 10-fluid volume storage component; 10-1-drainage blind hole; 11-flow guide hole; 12-annular space; 13-anti-impact component; 13-1-flow hole; 14-normally open fluid channel;

[0042] 15-first sealing seat; 15-1-first annular groove; 15-2-first radial guide hole; 15-3-annular fluid storage groove;

[0043] 16-muffler; 17-static sealing structure; 18-dynamic sealing structure;

[0044] 19-second sealing seat; 19-1-second annular groove; 19-2-second radial guide hole; 19-3-annular fluid storage groove;

[0045] 20-valve opens and closes the inlet and outlet of power fluid; 21-check valve seat; 21-1-blocking hole. DETAILED DESCRIPTION

[0046] like Figure 1 As shown, the fluid valve of this embodiment includes a valve body 1 and a valve stem 2. The valve body 1 has a fluid inlet 6, a fluid outlet 7 and a valve stem reciprocating motion channel 4. The valve stem 2 is located in the valve stem reciprocating motion channel 4 and controls the opening or closing of the fluid valve. When the fluid valve is opened, the fluid flows from the fluid inlet 6 to the fluid outlet 7 and flows out of the fluid valve. The valve body 1 in this embodiment includes a main body 1-1 and a valve stem mounting body 1-3 fixedly mounted together. The main body 1-1 and the valve stem mounting body 1-3 are integrally formed. The inner cavity of the main body 1-1 and the inner cavity of the valve stem mounting body 1-3 form the valve stem reciprocating motion channel 4.

[0047] like Figure 1 and Figure 2 As shown, the valve stem reciprocating motion channel 4 includes a valve closing power compensation chamber 4-1, a valve closing power chamber 4-2 and a fluid flow chamber 4-3, the valve closing power chamber 4-2 is located between the valve closing power compensation chamber 4-1 and the fluid flow chamber 4-3, and the valve closing power chamber 4-2 and the valve closing power compensation chamber 4-1 as well as the valve closing power chamber 4-2 and the fluid flow chamber 4-3 are fluid-tight; the valve stem 2 passes through the valve closing power chamber 4-2, and one end of the valve stem 2 extends into the fluid flow chamber 4-3 and the other end extends into the valve closing power compensation chamber 4-1; the fluid inlet 6 and the fluid outlet 7 are connected through the fluid flow chamber The chamber 4-3 is fluid-conducting; the valve closing power chamber 4-2 includes a first valve closing power chamber 4-21 and a second valve closing power chamber 4-22, and the first valve closing power chamber 4-21 and the second valve closing power chamber 4-22 are fluid-sealed by a driving piston 3 fixedly mounted on the valve stem 2; the driving piston 3 is driven to drive the valve stem 2 to move synchronously by filling the first valve closing power chamber 4-21 or the second valve closing power chamber 4-22 with fluid to open or close the fluid valve, and the outer peripheral surface of the driving piston 3 is liquid-sealed with the valve closing power chamber 4-2. In this embodiment, a dynamic sealing structure is installed on the outer peripheral surface of the driving piston 3 to achieve liquid sealing between the two.

[0048] like Figure 1As shown, a first sealing seat 15 is installed between the valve closing power chamber 4-2 and the fluid flow chamber 4-3, and the outer peripheral surface of the first sealing seat 15 is liquid-tight with the inner wall of the valve stem reciprocating motion channel 4, the valve stem 2 passes through the middle hole on the first sealing seat 15, and the outer peripheral surface of the valve stem 2 is liquid-tight with the inner wall of the middle hole on the first sealing seat 15; a first annular groove 15-1 is provided on the outer peripheral surface of the first sealing seat 15, and a first radial guide hole 15-2 is provided in the first sealing seat 15, one end of the first radial guide hole 15-2 is fluid-conducted with the gap between the valve stem 2 and the inner wall of the middle hole on the first sealing seat 15 [in this embodiment, an annular fluid storage groove 15-3 is provided on the wall of the middle hole of the first sealing seat 15, The annular fluid storage groove 15-3 is opposite to the first radial guide hole 15-2, which is adjacent to one end of the valve stem 2, and the two are connected. One end of the first radial guide hole 15-2 is in fluid communication with the first annular groove 15-1. The valve body 1 is provided with a first drainage hole 1-4 which is in fluid communication with the first annular groove 15-1. A muffler 16 is installed in the first drainage hole 1-4. Along the axial direction of the valve stem 2: there is at least one static sealing structure 17 between the outer peripheral surface of the first sealing seat 15 on both sides of the first annular groove 15-1 and the inner wall of the valve stem reciprocating motion channel 4, and there is at least one dynamic sealing structure 18 between the outer peripheral surface of the valve stem 2 on both sides of the first radial guide hole 15-2 facing the valve stem 2 and the inner wall of the center hole on the first sealing seat 15.

[0049] like Figure 1 As shown, the two ends of the valve stem 2 of this embodiment are respectively a valve closing sealing end 2-1 and a valve closing dynamic compensation end 2-2, and an independent one-way valve seat 21 is installed in the valve body 1. The valve closing sealing end 2-1 closes the fluid valve by pressing on the one-way valve seat 21. The valve closing power compensation end 2-2 is liquid-tightly connected to the inner wall of the valve stem reciprocating channel 4; the valve stem 2 reciprocates in the valve stem reciprocating channel 4 so that the valve closing blocking end 2-1 opens or closes the fluid outlet 7 [in some other embodiments, it can also be designed that the valve stem 2 reciprocates in the valve stem reciprocating channel 4 so that the valve closing blocking end 2-1 opens or closes the fluid inlet 6 or the fluid channel between the fluid inlet 6 and the fluid outlet 7]; an independent one-way valve seat 21 is installed at the fluid outlet 7, and a blocking hole 21-1 connecting the fluid outlet 7 and the fluid flow chamber 4-3 is provided on the one-way valve seat 21, and the valve closing blocking end 2-1 closes the fluid valve by extending into this blocking hole 21-1 and pressing against the one-way valve seat 21.

[0050] like Figure 1As shown, the fluid valve of this embodiment has a valve closing power automatic compensation channel 5 and a valve closing power compensation surface 8: the valve closing power automatic compensation channel 5 is a through hole opened on the valve stem 2 from the valve closing blocking end 2-1 to the valve closing power compensation end 2-2. The valve closing power compensation surface 8 is a concave surface on the end surface of the valve closing power compensation end 2-2, and the valve closing power compensation surface 8 is a plane perpendicular to the movement direction of the valve stem 2 [in other embodiments, the valve closing power compensation end 2-2 can be a convex surface on the end surface of the valve closing power compensation end 2-2, or any two or a combination of the end surface of the valve closing power compensation end 2-2, the concave surface on the end surface of the valve closing power compensation end 2-2, and the convex surface on the end surface of the valve closing power compensation end 2-2, can achieve the same technical effect]. Specifically: a power compensation blind hole 2-4 is opened on the end surface of the valve closing power compensation end 2-2, and the bottom of the power compensation blind hole 2-4 is the valve closing power compensation surface 8. A fluid-proof volume storage component 10 with a discharge blind hole 10-1 is installed in the power compensation blind hole 2-4, and the outer peripheral surface of the fluid-proof volume storage component 10 is liquid-tightly connected to the inner wall of the power compensation blind hole 2-4, and the outer peripheral surface of the end of the fluid-proof volume storage component 10 away from the power compensation blind hole 2-4 is liquid-tightly connected to the inner wall of the valve stem reciprocating motion channel 4, so that an annular space 12 is surrounded by the inner wall of the valve stem reciprocating motion channel 4, the outer peripheral surface of the fluid-proof volume storage component 10 and the end surface of the hole wall of the power compensation blind hole 2-4; the opening direction of the discharge blind hole 10-1 is away from the valve closing power compensation surface 8, and a compression spring 9 is installed in the discharge blind hole 10-1, and the end of the compression spring 9 away from the discharge blind hole 10-1 is installed on the inner wall of the valve stem mounting body 1-3. A flow guide hole 11 is provided on the hole wall of the drainage blind hole 10-1, and the annular space 12 between the anti-fluid volume storage component 10 and the valve stem reciprocating motion channel 4 is fluidly connected to the drainage blind hole 10-1 through the flow guide hole 11; a drainage hole is provided on the valve stem mounting body 1-3 facing the opening of the drainage blind hole 10-1, and a muffler 16 is installed on the drainage hole. After the fluid valve is closed, the elastic force of the compression spring 9 drives the anti-fluid volume storage component 10 to approach the valve closing power compensation surface 8 so that the fluid between the anti-fluid volume storage component 10 and the valve closing power compensation surface 8 is discharged from the valve closing power automatic compensation channel 5.

[0051] like Figure 1As shown, a leak-proof pressure compensation surface 2 - 3 is provided on the valve closing blocking end 2 - 1 , and the pressure exerted by the fluid in the valve body 1 on the leak-proof pressure compensation surface 2 - 3 is in the valve closing movement direction of the valve stem 2 . As the fluid pressure in the valve body increases, the fluid is more likely to leak from the gap between the valve closing sealing end 2-1 and the inner wall of the sealing hole 21-1, and even the sudden increase in fluid pressure in the fluid flow chamber 4-3 will cause the compression spring 9 to be unable to keep the valve closing sealing end 2-1 from sealing the sealing hole 21-1. By providing a leak-proof pressure compensation surface 2-3 on the valve closing sealing end 2-1, the fluid in the fluid flow chamber 4-3 applies pressure to the valve closing sealing end 2-1 in the direction of the valve closing movement of the valve stem 2, thereby ensuring that the valve closing sealing end 2-1 effectively seals the sealing hole 21-1 without fluid leakage; in addition, the compression spring 9 applies pressure to the far end of the valve closing sealing end 2-1 through the fluid-proof volume storage component 10, and then applies pressure to the proximal end of the valve closing sealing end 2-1 through the leak-proof pressure compensation surface 2-3, which can better achieve effective sealing of the sealing hole 21-1 by the valve closing sealing end 2-1.

[0052] If the valve stem 2 is not provided with an automatic compensation channel 5 for the closing power, assuming that the maximum cross-section of the fluid sealing portion between the closing valve plugging end 2-1 extending into the plugging hole 21-1 and the inner wall of the plugging hole 21-1 is S1, the closing valve fluid resistance F1=PS1 exerted by the fluid in the fluid flow chamber 4-3 on the valve stem 2 in the open valve state, which makes the closing valve plugging end 2-1 away from the plugging hole 21-1, is applied to the valve stem 2, where P is the fluid pressure, and the closing valve fluid resistance F1 increases as the fluid pressure increases. Assuming that a cylinder is used to drive the valve stem 2 of the fluid valve of this embodiment to move to close the valve, if the gas source pressure is increased under a constant gas source pressure, the overall equipment cost will be greatly increased, and the cylinder diameter of the cylinder needs to be increased accordingly to overcome the closing valve fluid resistance F1 and close the valve, and the increase in the cylinder diameter of the cylinder will also increase the overall volume of the fluid valve, causing installation difficulties and requiring the existing equipment using the fluid valve to be upgraded and modified. For example, for the sanitation vehicles currently in use in actual work, air source equipment and water valve driving cylinders have been installed. If deep cleaning of the ground is required, the nozzles need to spray water at higher pressures. If the air source equipment or the water valve driving cylinder is not replaced, there is a technical problem that the water valve cannot be closed.

[0053] The utility model opens a valve closing power automatic compensation channel 5 on the valve stem 2, so that when the fluid valve is open, the fluid in the fluid flow chamber 4-3 can flow along the valve closing power automatic compensation channel 5 to the valve closing pressure compensation surface 8, so that the valve stem 2 can be applied with a valve closing compensation power F2 in the direction of the valve closing movement, and the valve closing compensation power F2 is opposite to the valve closing fluid resistance F1. The size of the valve closing compensation power F2 can be adjusted by adjusting the size of the area S2 of the valve closing pressure compensation surface 8, so that the valve closing fluid resistance F1 can be partially or completely offset according to actual work needs, so that the air source and valve stem driving cylinder or hydraulic cylinder of the existing equipment in use, such as sanitation vehicles, can be kept without replacement, and at the same time, a valve stem driving cylinder or hydraulic cylinder with a smaller diameter can be equipped when manufacturing the fluid valve, so that the volume of the fluid valve is greatly reduced. Of course, although the fluid valve of the utility model is invented and designed for high-pressure fluid, it can be completely applicable to low-pressure fluid without any modification.

[0054] In this embodiment, due to the existence of the valve closing pressure compensation surface 8, the fluid valve of the utility model can be made into a normally open valve or a normally closed valve by adjusting the size of the area S2 of the valve closing pressure compensation surface 8.

[0055] For example: for a normally closed valve, when the valve is open, as long as the sum of the valve closing compensation power F2, the gravity of the valve stem 2 and the elastic force of the compression spring 9 is greater than the resistance f of the valve stem 2 moving in the direction of valve closing movement [the resistance f includes the friction force of the valve stem 2 during movement and the force exerted on the valve stem 2 by the fluid in the fluid flow chamber 4-3 in the direction away from the valve closing movement], at this time, as long as the valve opening driving force applied to the valve stem 2 by the driving piston 3 is removed, the valve stem 2 will naturally fall until the valve closing sealing end 2-1 enters the sealing hole 2-1 to achieve valve closing. The resistance that needs to be overcome when opening this normally closed valve is only the gravity of the valve stem 2, the elastic force of the compression spring 9, the friction force when the valve stem 2 moves, and the force exerted on the valve stem 2 in the direction of closing the valve by the fluid in the fluid flow chamber 4-3. For a cylindrical valve stem with an inverted cone or columnar end 2-1 at the valve closing sealing end, it is not necessary to overcome "the force exerted on the valve stem 2 in the direction of closing the valve by the fluid in the fluid flow chamber 4-3" when opening the valve. At this time, the valve opening driving force that needs to be applied to the driving piston 3 to open the valve is smaller.

[0056] For a normally open valve, as long as the sum of the closing valve compensation power F2, the gravity of the valve stem 2 and the elastic force of the compression spring 9 is less than the resistance f of the valve stem 2 moving in the closing valve movement direction, including the friction force and the force exerted on the valve stem 2 by the fluid in the fluid flow chamber 4-3 in the direction away from the closing valve movement, the fluid valve can maintain a normally open state. When closing the valve, this normally open valve only needs to overcome the difference between the "resistance f in the closing valve movement direction" and the "sum of the closing valve compensation power F2, the gravity of the valve stem 2 and the elastic force of the compression spring 9". By adjusting the size of the area S2 of the closing valve pressure compensation surface 8, this difference can be made very small. At this time, as long as a small closing valve driving force is applied to the valve stem 2 by driving the piston 3, the valve stem 2 can fall until the closing valve blocking end 2-1 enters the blocking hole 2-1 to close the valve. After this normally open valve is closed, the valve closing compensation power F2 disappears, and at the same time, the force applied to the end of the valve closing sealing end 2-1 in the direction away from the valve closing movement also disappears. At this time, the valve opening driving force required to be applied to the driving piston 3 to open the valve is equal to "the gravity of the valve stem 2, the elastic force of the compression spring 9, the valve opening friction force and the force applied to the valve stem 2 in the direction of the valve closing movement". For the cylindrical valve stem, there is no "force applied to the valve stem 2 in the direction of the valve closing movement", so the valve opening driving force required to open the valve is also smaller, and it is easier to open the valve.

[0057] Although a multi-channel dynamic sealing structure is set between the valve stem 2 and the first sealing seat 15, in order to prevent the fluid in the fluid flow chamber 4-3 from entering the valve closing power chamber 4-2 along the fine gap between the outer peripheral surface of the valve stem 2 and the inner wall of the hole in the first sealing seat 15, when the cylinder is used for driving, the liquid entering the valve closing power chamber 4-2 will eventually cause the cylinder to fail to work normally or even lose its driving ability. Especially when used for high-pressure fluid, the possibility of fluid entering the valve closing power chamber 4-2 from the fluid flow chamber 4-3 is The utility model is designed with interconnected annular fluid storage groove 15-3, first radial flow guide hole 15-2 and first drainage hole 1-4, and muffler 16 is installed at first drainage hole 1-4, so that the fluid flowing along the fine gap between the outer peripheral surface of valve stem 2 and the inner wall of the hole in first sealing seat 15 toward the valve closing power chamber 4-2 can enter into annular fluid storage groove 15-3, and pass through first radial flow guide hole 15-2, first drainage hole 1-4 and muffler 16 to be discharged to the outside of fluid valve. Similarly, the fluid flowing along the fine gap between the inner wall of valve stem reciprocating motion channel 4 and first sealing seat 15 toward the valve closing power chamber 4-2 can enter into first annular groove 15-1, and pass through first drainage hole 1-4 and muffler 16 to be discharged to the outside of fluid valve. In addition, the fluid that enters between the anti-fluid volume storage component 10 and the valve closing dynamic compensation surface 8 may enter the annular space 12 along the gap between the anti-fluid volume storage component 10 and the inner wall of the dynamic compensation blind hole 2-4. The diversion hole 11 opened on the hole wall of the drainage blind hole 10-1 can divert the fluid in the annular space 12 into the drainage blind hole 10-1, and be discharged to the outside of the fluid valve from the drainage hole opened on the valve stem mounting body 1-3 facing the opening of the drainage blind hole 10-1 and the muffler 16 installed on this drainage hole.

[0058] After closing the valve, the compression spring 9 pushes the anti-fluid volume storage component 10 to press against the valve closing power compensation surface 8, so that the fluid between the anti-fluid volume storage component 10 and the valve closing power compensation surface 8 can be discharged along the valve closing power automatic compensation channel 5 opened on the valve stem 2 to the end face of the valve closing sealing end 2-1 outside the fluid valve, which is the outlet of the valve closing power automatic compensation channel 5. Compared with the fluid pressure in the valve body, the pressure is lower, so it is easy to discharge; for sanitation vehicles, at this time, the pressure at the end face of the valve closing sealing end 2-1 is equal to the external atmospheric pressure. Completely draining the fluid between the anti-fluid volume storage component 10 and the valve closing power compensation surface 8 can increase the service life of the fluid valve, reduce failures and improve the reliability of the use of the fluid valve. For example, for sanitation vehicles, the water between the anti-fluid volume storage component 10 and the valve closing power compensation surface 8 will freeze in winter, causing the valve closing power compensation surface 8 to lose its application function and role, and it will not be restored until the ice melts, affecting the normal operation of the sanitation vehicle; while the remaining water in the valve closing power automatic compensation channel 5 will not be affected by freezing. This is because: when the valve is opened, the valve closing blocking end 2-1 is in direct contact with the fluid in the valve body, and the ice in the valve closing power automatic compensation channel 5 adjacent to the fluid flow chamber 4-3 will melt quickly and gradually move toward the valve closing power compensation end 2-2. The water pressure in the fluid flow chamber 4-3 can push the remaining ice in the valve closing power automatic compensation channel 5 to move toward the space between the anti-fluid volume storage component 10 and the valve closing power compensation surface 8, thereby achieving rapid melting of the remaining ice in the valve closing power automatic compensation channel 5 without affecting the normal operation of the sanitation vehicle.

[0059] Example 2

[0060] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that an anti-impact component 13 is installed between the one-way valve seat 21 and the valve body 1, and a flow hole 13-1 is opened on it so as not to affect the normal flow of the fluid in the fluid flow chamber 4-3, and the anti-impact component 13 presses the one-way valve seat 21 in the valve closing movement direction of the valve stem 2. This structural design can avoid the technical problem that the one-way valve seat 21 falls off when the high-pressure fluid flows out of the fluid outlet 7 when the valve is opened. Of course, the anti-impact component 13 and the one-way valve seat 21 can also be designed as an integrally formed structure, which is more convenient to assemble.

[0061] Example 3

[0062] like Figure 4As shown, the difference between this embodiment and embodiment 1 is that: the valve stem mounting body 1-3 is a split structure, a second sealing seat 19 is installed between the valve closing power compensation chamber 4-1 and the valve closing power chamber 4-2, the outer peripheral surface of the second sealing seat 19 and the inner wall of the valve stem reciprocating motion channel 4 are liquid-tight, the valve stem 2 passes through the middle hole on the second sealing seat 19, and the outer peripheral surface of the valve stem 2 and the inner wall of the middle hole on the second sealing seat 19 are liquid-tight; a second annular groove 19-1 is provided on the outer peripheral surface of the second sealing seat 19, and a second radial guide hole 19-2 is provided in the second sealing seat 19, one end of the second radial guide hole 19-2 is connected to the valve stem 2 and the first The gap between the inner walls of the middle holes on the two sealing seats 19 is fluid-conducted, one end of the second radial flow guide hole 19-2 is fluid-conducted with the second annular groove 19-1, the valve body 1 is provided with a second drainage hole 1-5 fluid-conducted with the second annular groove 19-1, and a muffler 16 is installed in the second drainage hole 1-5; along the axial direction of the valve stem 2: there is at least one static sealing structure 17 between the outer peripheral surface of the second sealing seat 19 on both sides of the second annular groove 19-1 and the inner wall of the valve stem reciprocating motion channel 4, and there is at least one dynamic sealing structure 18 between the outer peripheral surface of the valve stem 2 on both sides of the second radial flow guide hole 19-2 facing the valve stem 2 and the inner wall of the middle hole on the second sealing seat 19. This structure can better prevent the fluid in the valve closing power compensation chamber 4-1 from entering the valve closing power chamber 4-2, and its technical principle is consistent with the first sealing seat 15 in the embodiment, which will not be repeated here.

[0063] In addition, another important difference between this embodiment and embodiment 1 is that the anti-fluid accumulation component 10 is not installed, so that after the valve is closed, it is difficult for the power compensation blind hole 2-4 to be quickly discharged from the valve closing blocking end 2-1 to the outside of the fluid valve along the valve closing power automatic compensation channel 5. For sanitation vehicles operating in the northern winter, the water accumulated in the power compensation blind hole 2-4 will freeze quickly, which may cause the valve closing power compensation surface 8 to lose its proper function during the operation of the sanitation vehicle.

[0064] Example 4

[0065] like Figure 5 As shown, the fluid valve in Example 2 may also be the fluid valve in Example 1 or Example 3, and between two adjacent fluid valves: the upstream fluid valve is fluidly connected to the fluid inlet 6 of the downstream fluid valve through the normally open fluid channel 14 opened on the valve body 1, so that multi-way fluid supply can be achieved, which is very suitable for sanitation vehicles that require multi-way water supply.

[0066] It should be noted that the above content of the utility model is only an example of a situation in which a through hole is opened along the axis of the valve stem 2 as the automatic compensation channel 5 for closing the valve power and the fluid flowing out of the automatic compensation channel 5 for closing the valve power directly applies a force in the valve closing direction to the valve stem 2. Based on the above content disclosed in the utility model, those skilled in the art can make other different forms of changes or modifications without spending any creative labor, for example:

[0067] A. A hole connecting to the outside of the valve body is opened at the blocking hole 21-1, and an external pipeline is guided to the valve closing power compensation chamber 4-1. This external pipeline is equivalent to the valve closing power automatic compensation channel 5 in the technical solution claimed for protection by the utility model.

[0068] B. Use the fluid flowing out of the valve closing power automatic compensation channel 5 to indirectly apply a force in the valve closing direction to the valve stem 2. For example: the simplest method is to add a lever, use the fluid flowing out of the valve closing power automatic compensation channel 5 to drive one end of the lever, and apply a force in the valve closing direction to the valve stem 2 through the other end of the lever; the fluid flowing out of the valve closing power automatic compensation channel 5 can also be used to drive the wheel to rotate, and then convert the rotation of the wheel into linear motion. The hydraulic drive wheel rotates, and the rotation of the wheel is then converted into linear motion. This is common knowledge and will not be repeated here, thereby applying a force in the valve closing direction to the valve stem 2; the fluid flowing out of the valve closing power automatic compensation channel 5 can also be used to drive a component to move linearly, and the linear motion of this component can be used to apply a force in the valve closing direction to the valve stem 2.

[0069] C. The automatic compensation channel 5 for closing valve power is not limited to being provided on the valve stem 2, but may also be provided on the valve body 1. In this case, the wall thickness of the valve body needs to be increased accordingly.

[0070] The above situations all fall within the protection scope of the claims of this application, and the applicant does not need to and cannot list all implementation methods exhaustively.

[0071] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A fluid valve, comprising a valve body (1) and a valve stem (2), wherein the valve body (1) is provided with a fluid inlet (6), a fluid outlet (7) and a valve stem reciprocating motion channel (4), wherein the valve stem (2) is located in the valve stem reciprocating motion channel (4) and controls the opening or closing of the fluid valve, and when the fluid valve is opened, the fluid flows from the fluid inlet (6) to the fluid outlet (7) and flows out of the fluid valve, wherein: It also includes a valve closing power automatic compensation channel (5), the fluid inlet end of the valve closing power automatic compensation channel (5) is connected to the fluid in the valve body (1); after the fluid valve is opened: the fluid in the valve body (1) flows from the fluid inlet end of the valve closing power automatic compensation channel (5) to the fluid outlet end of the valve closing power automatic compensation channel (5) under the fluid's own pressure, and then applies a force to the valve stem (2) in the direction of the valve stem (2) closing movement; after the fluid valve is closed: the fluid pressure at the fluid outlet end of the valve closing power automatic compensation channel (5) is reduced.

2. The fluid valve according to claim 1, characterized in that: The fluid outlet end of the automatic valve closing power compensation channel (5) is fluidly connected to the valve closing power compensation surface (8) on the valve stem (2), and the fluid flowing out of the fluid outlet end of the automatic valve closing power compensation channel (5) applies a force on the valve stem (2) in the direction of the valve closing movement of the valve stem (2) through the valve closing power compensation surface (8).

3. The fluid valve according to claim 2, characterized in that: The two ends of the valve stem (2) are respectively a valve closing sealing end (2-1) and a valve closing power compensation end (2-2); the valve stem (2) reciprocates in the valve stem reciprocating motion channel (4) so ​​that the valve closing sealing end (2-1) opens or closes the fluid inlet (6), the fluid outlet (7) or the fluid channel between the fluid inlet (6) and the fluid outlet (7); the valve closing power compensation surface (8) is: the end surface of the valve closing power compensation end (2-2), or the concave surface on the end surface of the valve closing power compensation end (2-2), or the convex surface on the end surface of the valve closing power compensation end (2-2), or any two of the end surface of the valve closing power compensation end (2-2), the concave surface on the end surface of the valve closing power compensation end (2-2) and the convex surface on the end surface of the valve closing power compensation end (2-2), or a combination of the three.

4. The fluid valve according to claim 3, characterized in that: The valve closing dynamic compensation surface (8) is a plane perpendicular to the movement direction of the valve stem (2).

5. The fluid valve according to claim 3, characterized in that: A compression spring (9) is installed between the valve closing power compensation end (2-2) and the valve body (1), and the elastic force of the compression spring (9) on the valve closing power compensation end (2-2) is directed toward the valve closing movement direction of the valve stem (2).

6. The fluid valve according to claim 5, characterized in that: An anti-fluid volume storage component (10) is installed between the compression spring (9) and the valve closing power compensation surface (8), and the outlet of the fluid between the anti-fluid volume storage component (10) and the valve closing power compensation surface (8) is the valve closing power automatic compensation channel (5); after the fluid valve is closed, the elastic force of the compression spring (9) drives the anti-fluid volume storage component (10) to approach the valve closing power compensation surface (8) so that the fluid between the anti-fluid volume storage component (10) and the valve closing power compensation surface (8) is discharged from the valve closing power automatic compensation channel (5).

7. The fluid valve according to claim 6, characterized in that: A power compensation blind hole (2-4) is provided on the end surface of the valve closing power compensation end (2-2); the first end of the anti-fluid volume storage component (10) is located in the power compensation blind hole (2-4), and the first end of the anti-fluid volume storage component (10) is liquid-tightly sealed with the inner wall of the power compensation blind hole (2-4); the bottom of the power compensation blind hole (2-4) is the valve closing power compensation surface (8); and the compression spring (9) is located between the second end of the anti-fluid volume storage component (10) and the valve body (1).

8. The fluid valve according to claim 7, characterized in that: A drainage blind hole (10-1) is provided on the second end surface of the anti-fluid volume storage component (10), and one end of the compression spring (9) adjacent to the anti-fluid volume storage component (10) is located in the drainage blind hole (10-1); a guide hole (11) is provided on the hole wall of the drainage blind hole (10-1), and the annular space (12) between the anti-fluid volume storage component (10) and the valve stem reciprocating motion channel (4) is fluid-conducted with the drainage blind hole (10-1) through the guide hole (11).

9. The fluid valve according to claim 1, characterized in that: After the fluid valve is closed, the fluid passage between the fluid inlet end of the valve closing power automatic compensation passage (5) and the fluid in the valve body (1) is disconnected.

10. The fluid valve according to claim 3, characterized in that: The valve closing power automatic compensation channel (5) is a through hole formed on the valve stem (2) from the valve closing blocking end (2-1) to the valve closing power compensation end (2-2).

11. The fluid valve according to claim 3, characterized in that: The valve closing sealing end (2-1) is provided with a leak-proof pressure compensation surface (2-3), and the pressure exerted on the leak-proof pressure compensation surface (2-3) by the fluid in the valve body (1) is directed toward the valve closing movement direction of the valve stem (2).

12. The fluid valve according to claim 3, characterized in that: An independent one-way valve seat (21) is installed in the valve body (1), and the valve closing sealing end (2-1) closes the fluid valve by pressing against the one-way valve seat (21). An anti-impact component (13) is installed between the one-way valve seat (21) and the valve body (1), and the anti-impact component (13) presses the one-way valve seat (21) in the valve closing movement direction of the valve stem (2).

13. The fluid valve according to claim 1, characterized in that The valve stem reciprocating motion channel (4) comprises a valve closing power compensation chamber (4-1), a valve closing power chamber (4-2) and a fluid flow chamber (4-3); the valve closing power chamber (4-2) is located between the valve closing power compensation chamber (4-1) and the fluid flow chamber (4-3), and the valve closing power chamber (4-2) and the valve closing power compensation chamber (4-1) as well as the valve closing power chamber (4-2) and the fluid flow chamber (4-3) are fluid-tight; the valve stem (2) passes through the valve closing power chamber (4-2), and one end of the valve stem (2) extends into the fluid flow chamber (4-3). ) and the other end extends into the valve closing power compensation chamber (4-1); the fluid inlet (6) and the fluid outlet (7) are fluid-conducted through the fluid flow chamber (4-3); the valve closing power chamber (4-2) includes a first valve closing power chamber and a second valve closing power chamber, and the first valve closing power chamber and the second valve closing power chamber are fluid-sealed by a driving piston (3) fixedly mounted on the valve stem (2); by filling the first valve closing power chamber or the second valve closing power chamber with fluid, the driving piston (3) drives the valve stem (2) to move synchronously, so as to open or close the fluid valve.

14. The fluid valve according to claim 13, characterized in that: A first sealing seat (15) is installed between the valve closing power chamber (4-2) and the fluid flow chamber (4-3); the outer peripheral surface of the first sealing seat (15) and the inner wall of the valve stem reciprocating motion channel (4) are liquid-tight; the valve stem (2) passes through the middle hole on the first sealing seat (15), and the outer peripheral surface of the valve stem (2) and the inner wall of the middle hole on the first sealing seat (15) are liquid-tight; a first annular groove (15-1) is provided on the outer peripheral surface of the first sealing seat (15), and a first radial guide hole (15-2) is provided in the first sealing seat (15); one end of the first radial guide hole (15-2) and the gap between the valve stem (2) and the inner wall of the middle hole on the first sealing seat (15) are fluid-tight; The valve body (1) is provided with a first drainage hole (1-4) which is in fluid communication with the first annular groove (15-1), and a muffler (16) is installed in the first drainage hole (1-4); along the axial direction of the valve stem (2): at least one static sealing structure (17) is provided between the outer peripheral surface of the first sealing seat (15) on both sides of the first annular groove (15-1) and the inner wall of the valve stem reciprocating motion channel (4); and at least one dynamic sealing structure (18) is provided between the outer peripheral surface of the valve stem (2) on both sides of the first radial drainage hole (15-2) facing the valve stem (2) and the inner wall of the middle hole on the first sealing seat (15).

15. The fluid valve according to claim 13, characterized in that: A second sealing seat (19) is installed between the valve closing power compensation chamber (4-1) and the valve closing power chamber (4-2), and a liquid seal is formed between the outer peripheral surface of the second sealing seat (19) and the inner wall of the valve stem reciprocating motion channel (4); the valve stem (2) passes through the middle hole on the second sealing seat (19), and a liquid seal is formed between the outer peripheral surface of the valve stem (2) and the inner wall of the middle hole on the second sealing seat (19); a second annular groove (19-1) is provided on the outer peripheral surface of the second sealing seat (19), and a second radial guide hole (19-2) is provided in the second sealing seat (19), and a gap between one end of the second radial guide hole (19-2) and the valve stem (2) and the inner wall of the middle hole on the second sealing seat (19) is filled with fluid. The valve body (1) is provided with a second drainage hole (1-5) which is in fluid communication with the second annular groove (19-1), and a muffler (16) is installed in the second drainage hole (1-5); along the axial direction of the valve stem (2): at least one static sealing structure (17) is provided between the outer peripheral surface of the second sealing seat (19) on both sides of the second annular groove (19-1) and the inner wall of the valve stem reciprocating motion channel (4); and at least one dynamic sealing structure (18) is provided between the outer peripheral surface of the valve stem (2) on both sides of the second radial drainage hole (19-2) facing the valve stem (2) and the inner wall of the middle hole on the second sealing seat (19).

16. A fluid diverter valve, characterized in that: Comprising two or more fluid valves as described in any one of claims 1 to 11, between two adjacent fluid valves: the upstream fluid valve is fluidly connected to the fluid inlet (6) of the downstream fluid valve through a normally open fluid channel (14) opened on the valve body (1).

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