Piston type control valve

Abstract

The present invention provides a piston type control valve, including a valve body, a base and a valve core. The valve body is arranged on the base, and a first channel is provided in the valve body. Both ends of the first channel are connected to the outside world. A slide groove is provided in the base, and the valve body is provided with a first through hole for connecting the slide groove and the first channel. The valve core includes a piston part and a valve stem part. The piston part is slidably arranged in the slide groove, and one end of the valve stem part away from the piston part extends to the first channel through the first through hole. A second channel is provided on the base, and the second channel is connected with the slide groove. The second channel is used to provide positive pressure or negative pressure in the slide groove, so that the piston part approaches or moves away from the first channel, and the valve stem part isolates the first channel or connects the first channel, so as to improve the problem that the valve needs to overcome a large pressure when opening. The control valve of the present application needs to overcome a small pressure when opening and closing, is easy to use, and has a compact structure, which can reduce material costs.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to a piston type control valve. Background Art

[0002] The valves in compressors and pump products are usually solenoid valves and pneumatic diaphragm valves. These valves have great limitations on pressure levels, especially when the pressure is higher than 100 bar. The solenoid valve has high magnetic force requirements, which leads to high costs and the valve diameter cannot be increased. Diaphragm valves usually require pilot pressure to work with the electromagnetic coil, which is not convenient for practical use.

[0003] A Chinese patent application with publication number CN201106683Y discloses a vacuum pressure isolation valve, including: a valve body, a sealing cover, a piston, a valve stem, an upper return spring and a lower return spring. When in use, air pressure is generated by inflating the top of the piston to cause the piston to move downward, pushing the valve stem downward while keeping the valve in a connected state. When used in this way, the gas pressure generated at the top of the piston needs to overcome the pressure in the working chamber, the elastic force of the upper return spring, the elastic force of the lower return spring and the friction between the contact structures, etc., which has high requirements on the starting air force during use and requires that the pressure in the working chamber cannot be too high, which is not convenient for controlling the opening of the valve during actual use.

[0004] Therefore, it is necessary to design a control valve that is easy to control to solve the problems existing in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a piston type control valve to improve the problem that the valve needs to overcome a relatively large pressure when opening.

[0006] The present invention provides a piston type control valve, comprising a valve body, a base and a valve core;

[0007] The valve body is arranged on the base, and a first channel is arranged in the valve body, and two ends of the first channel are used to communicate with the outside;

[0008] A slide groove is provided in the base, and a first through hole connecting the slide groove and the first channel is provided in the valve body;

[0009] The valve core comprises a piston portion and a valve stem portion;

[0010] The piston portion is slidably disposed in the slide groove, and one end of the valve stem portion away from the piston portion extends to the first channel through the first through hole;

[0011] The base is provided with a second channel, which is connected to the slide groove. The second channel is used to provide positive pressure or negative pressure in the slide groove to make the piston part approach or move away from the first channel, and make the valve stem part block the first channel or make the first channel connected.

[0012] The beneficial effect of the piston type control valve of the present invention is that: a first channel is provided in the valve body, and fluid flows in the first channel, and is slidably arranged in the slide groove through the piston part, and the end of the valve stem part away from the piston part extends to the first channel through the first through hole, so that the valve stem part can extend into the first channel and block the first channel, and a second channel is provided on the base, and the second channel is communicated with the slide groove, and the second channel is used to provide positive pressure or negative pressure in the slide groove, so that the piston part approaches or moves away from the first channel, and the valve stem part blocks the first channel or connects the first channel, that is, when the control valve needs to be closed, the second channel is used to press the piston part to close the first channel. Pressure is applied to the side of the plug portion so that the end of the valve stem portion away from the piston portion abuts against the first channel to block the first channel. When the control valve needs to be opened, the pressure applied to the second channel is removed, and the valve stem portion moves toward the second channel under the action of the fluid's own pressure, so that the control valve reaches an open state. When controlling the opening of the pressurized medium, there is no need to apply external force or negative pressure to help the control valve open. When closing, it is only necessary to overcome the friction between the valve core and the base and the pressure of the fluid. It can be seen that the control valve of the present application has a small pressure to overcome when opening and closing, and is easy to use. The control valve of the present application has a compact structure and can be used in an environment with limited installation space, and can reduce material costs.

[0013] In a feasible solution, the piston control valve further includes a sealing member, which is arranged in the first channel and is used to seal the valve stem and the first through hole. The beneficial effect is that the sealing member can improve the sealing effect between the valve stem and the first through hole.

[0014] In a feasible solution, the valve stem is provided with a first conical surface, and the side wall of the first channel is provided with a second conical surface adapted to the first conical surface. The beneficial effect is that the first conical surface and the second conical surface can improve the sealing effect between the valve stem and the first channel.

[0015] In a feasible solution, the piston control valve further includes a resisting assembly, which is arranged in the first channel and abuts against the side wall of the valve stem. The beneficial effect is that the abutting assembly can squeeze the valve stem, so that the valve stem and the resisting assembly form a friction force, thereby enhancing the force of the valve stem abutting against the first channel, and improving the applicable pressure range of the control valve.

[0016] In a feasible solution, the abutment component is arranged on a side of the first channel close to the inlet end of the first channel. The beneficial effect is that the abutment component is pressed onto the valve stem by the pressure of the fluid itself, thereby generating a greater friction force.

[0017] In a feasible solution, the first conical surface is provided with a first protrusion, and at least one first protrusion is provided. The beneficial effect is that the original conical surface seal is changed to a conical surface line seal through the first protrusion, the contact area between the valve stem and the second conical surface is reduced, and the sealing effect is improved.

[0018] In a feasible solution, the first conical surface is provided with a second protrusion, the second protrusion is provided with at least one, the first protrusion is a hard protrusion, and the second protrusion is a soft protrusion. Its beneficial effect is that the second protrusion can form mutual protection between the first protrusion and the second protrusion, the first protrusion can ensure that the deformation degree of the second protrusion when contacting the second conical surface is within a certain range, the second protrusion can share the sealing pressure borne by the first protrusion when contacting the second conical surface, reduce the wear of the first protrusion during use, and extend the service life of the control valve.

[0019] In a feasible solution, a lip seal is provided on the valve stem or the first channel, and the lip seal abuts against the side wall of the first channel or the valve stem. The beneficial effect is that the lip seal is indirectly sealed to reduce the influence of impurities in the fluid on the valve core, thereby ensuring the service life of the control valve.

[0020] In a feasible solution, the sealing member includes an isolating ring and at least two first sealing rings;

[0021] The isolating ring is provided with a second through hole for the valve stem to pass through, at least one of the first sealing rings is provided between the valve stem and the isolating ring, and at least one of the first sealing rings is provided between the isolating ring and the valve body. The beneficial effect is that the isolating ring and the first sealing ring can be provided to seal between the isolating ring and the valve body, and between the isolating ring and the valve stem, thereby improving the sealing effect between the valve stem and the valve body.

[0022] In a feasible solution, an overflow hole is provided on the valve body, one end of which is connected to the outside, and the other end of which extends to the isolation ring or the first through hole. The beneficial effect is that the overflow hole can guide the fluid flowing to the piston part through the gap between the isolation ring and the valve body and the gap between the isolation ring and the valve stem to the outside of the control valve, thereby reducing the impact on the piston part and ensuring the normal use of the control valve.

[0023] In a feasible solution, the sealing member includes a bellows, which is sleeved on the valve stem, and one end of the bellows is fixed to the valve stem, and the other end of the bellows is fixed to the side wall of the first channel. The beneficial effect is that the bellows can be extended and retracted as the valve stem moves, and the two ends of the bellows are fixed and sealed, which can greatly reduce the possibility of fluid flowing from the gap between the valve stem and the valve body to the piston.

[0024] In a feasible solution, the piston control valve further includes an elastic member, which is arranged in the slide groove, and one end of the elastic member abuts against the side of the piston away from the valve stem. The beneficial effect is that the elastic member can increase the force of the valve stem acting on the side wall of the first channel, thereby increasing the pressure that the control valve can apply.

[0025] In a feasible solution, a third channel is provided on the base, and the third channel is connected to the side of the slide groove close to the valve stem. The beneficial effect is that such a setting can reduce the influence of gas compression or expansion in the space on the side of the slide groove close to the valve stem on the piston part, and at the same time, pressure or negative pressure can be applied on the side of the slide groove close to the valve stem to assist in opening and closing the control valve.

[0026] In a feasible solution, the valve body includes a valve cover and a valve seat;

[0027] The first channel includes a first section, a second section and a third section;

[0028] The valve cover is arranged on the valve seat, the valve seat is arranged on the base, the first section is arranged in the valve cover, the second section and the third section are arranged in the valve seat, one end of the second section is communicated with the first section, and the other end of the second section is communicated with the third section. The beneficial effect is that such arrangement facilitates the installation of the sealing member and facilitates the disassembly and replacement of the internal structure.

[0029] In a feasible solution, the valve body further includes a sealing ring and at least two second sealing rings;

[0030] The sealing ring is provided with a third through hole, the sealing ring is arranged in at least one of the valve cover and the valve seat, the third through hole is connected to at least one of the first section and the second section, at least one of the second sealing rings is arranged between the sealing ring and the valve cover, and at least one of the second sealing rings is arranged between the sealing ring and the valve seat. The beneficial effect is that such an arrangement can improve the sealing effect between the valve cover and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a piston type control valve in a first embodiment of the present invention;

[0032] Figure 2 for Figure 1 Another structural diagram of the piston control valve;

[0033] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the piston control valve;

[0034] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0035] Figure 5 for Figure 1 Schematic diagram of the structure of the valve core and the sealing ring;

[0036] Figure 6 for Figure 1 A schematic diagram of the structure of the middle supporting component;

[0037] Figure 7 It is a schematic cross-sectional structure diagram of a piston type control valve in a second embodiment of the present invention;

[0038] Figure 8 for Figure 7 A schematic diagram of the enlarged structure at B in the middle;

[0039] Fig. 9 It is a schematic cross-sectional structure diagram of a piston type control valve in a third embodiment of the present invention;

[0040] Fig.10 It is a schematic cross-sectional structure diagram of a piston type control valve in a fourth embodiment of the present invention.

[0041] Figure 1-10 Label:

[0042] 1. Valve body; 101. First channel; 102. First through hole; 103. Second cone surface; 104. Overflow hole; 105. Valve cover; 106. Valve seat; 107. First section; 108. Second section; 109. Third section; 110. Sealing ring; 111. Second sealing ring; 112. Vertical section; 113. Horizontal section;

[0043] 2. Base; 201. Slide; 202. Second channel; 203. Third channel;

[0044] 3. Valve core; 301. Piston portion; 302. Valve stem portion; 303. First conical surface; 304. First protrusion; 305. Second protrusion; 306. Lip seal ring; 307. Boss portion; 308. Outer ring; 309. Inner ring;

[0045] 4. Sealing element; 401. Isolation ring; 402. First sealing ring; 403. Bellows;

[0046] 5. abutting assembly; 501. a first spring; 502. a sliding block;

[0047] 6. Elastic member; 601. Second spring. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the present invention belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0049] In order to overcome the problems existing in the prior art, an embodiment of the present invention provides a piston type control valve.

[0050] Figure 1 This is a schematic diagram of the structure of a piston control valve in the first embodiment of the present invention. Figure 2 for Figure 1 Another perspective structural diagram of the piston control valve. Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the piston control valve. Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0051] In some embodiments of the present invention, referring to Figures 1 to 4 The piston control valve comprises a valve body 1, a base 2 and a valve core 3, wherein the valve body 1 is arranged on the base 2, a first channel 101 is arranged in the valve body 1, and both ends of the first channel 101 are communicated with the outside, a slide groove 201 is arranged in the base 2, and a first through hole 102 for connecting the slide groove 201 with the first channel 101 is arranged on the valve body 1 and the base 2, and the valve core 3 comprises a piston part 301 and a valve stem part 302, wherein the piston part 301 is slidably arranged in the slide groove 201, and an end of the valve stem part 302 away from the piston part 301 extends to the first channel 101 through the first through hole 102, and a second channel 202 is arranged on the base 2, and the second channel 202 is communicated with the slide groove 201, and the second channel 202 is used to provide positive pressure or negative pressure in the slide groove 201, so as to make the piston part 301 approach or move away from the first channel 101, and make the valve stem part 302 cut off the first channel 101 or make the first channel 101 communicate.

[0052] Specifically, in this embodiment, referring to Figures 1 to 4 and Figure 7The outer contours of the valve body 1 and the base 2 are both set to be cylindrical, the base 2 is provided with a plurality of countersunk holes, the valve body 1 is provided with a plurality of threaded holes, the valve body 1 is fixed to the base 2 by bolts, the first channel 101 is arranged in the valve body 1, the first channel 101 is set to be L-shaped, including the vertical section 112 and the horizontal section 113, the top of the vertical section 112 is the inlet end, the left end of the horizontal section 113 is the outlet end, and the outlet end and the inlet end are both provided with threads to connect to a pipeline or other structures, the slide groove 201 is arranged on the upper part of the base 2, and is formed by the concave top surface of the base 2, the slide groove 201 is a cylindrical hole, the slide groove 201 is coaxially arranged with the first channel 101 of the vertical section 112, the first through hole 102 is arranged on the side wall of the valve body 1 between the vertical section 112 and the slide groove 201, and the first through hole 1 02 is coaxially arranged with the vertical section 112, the valve core 3 includes the valve stem portion 302 and the piston portion 301 which are coaxially arranged, the diameter of the piston portion 301 is larger than the diameter of the valve stem portion 302, and the outer diameter of the piston portion 301 is adapted to the diameter of the slide groove 201, the diameter of the valve stem portion 302 is not less than the diameter of the first channel 101 at the corner of the vertical section 112 and the horizontal section 113, the valve stem portion 302 extends into the first channel 101 through the first through hole 102, the second channel 202 is arranged on the base 2, one end of the second channel 202 is connected with the bottom end surface of the slide groove 201, that is, the pressure applied by the second channel 202 acts on the lower surface of the piston portion 301, the other end of the second channel 202 extends to the side wall of the base 2, and the other end of the second channel 202 is provided with a thread for connecting a pipeline or other structures. When in use, air pressure or hydraulic pressure is added to the slide groove 201 through the second channel 202, forming pressure on the bottom surface of the piston part 301, so that the valve core 3 moves upward, and the top surface of the valve stem part 302 abuts against the corner of the vertical section 112 and the horizontal section 113, so that the vertical section 112 is in a closed state, that is, the first channel 101 is blocked, so that the control valve is in a closed state. When it is necessary to open, the pressure at the second channel 202 is removed, and the valve stem part 302 is subjected to the pressure of the fluid in the vertical section 112, and the valve core 3 moves downward, and the vertical section 112 and the horizontal section 113 of the first channel 101 are reconnected, and the control valve is opened. In addition, when in use, the second channel 202 can also be evacuated to help the control valve open. And in the actual design, by improving the lubrication effect between the valve core 3, the valve body 1 and the base 2, the valve core 3 can move downward under the action of its own gravity, that is, the gravity of the valve core 3 is greater than the friction between the valve core 3 and the base 2, so that the control valve can be opened without pressure.

[0053] It is worth noting that, according to F=PS, when the pressure acting on the side of the piston portion 301 remains unchanged, the larger the area ratio of the piston portion 301 to the valve stem portion 302, the greater the force exerted by the valve stem portion 302 on the valve body 1, and the greater the sealing strength. Therefore, the area ratio of the piston portion 301 to the valve stem portion 302 can be adjusted as needed to adjust the pressure range applicable to the control valve, so that the control valve can be applicable to an environment with higher pressure.

[0054] In addition, the inlet and outlet of the control valve of the present application can be reversely arranged, but when the inlet and outlet are reversed, the closing or opening of the control valve needs to be controlled by controlling the positive pressure or negative pressure of the second channel 202. Moreover, when one end of the second channel 202 is connected to the upper end surface of the slide groove 201, that is, when the pressure applied by the second channel 202 acts on the upper surface of the piston part 301, the application of positive pressure can drive the valve stem part 302 to move downward, even if the first channel 101 is in an open state, and the application of negative pressure can drive the valve stem part 302 to move upward, even if the first channel 101 is in a blocked state.

[0055] In some embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4 The piston control valve further includes a sealing member 4 , which is disposed in the first channel 101 , and is used to seal the valve stem portion 302 and the first through hole 102 .

[0056] In some specific embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4 The seal 4 is arranged at the first channel 101, that is, placed at the intersection of the valve stem 302 and the valve body 1 in the first channel 101. Since there is a sliding seal between the seal 4 and the valve body 1, the provision of the seal 4 can improve the sealing effect between the valve stem 302 and the valve body 1.

[0057] In some embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4 The valve stem portion 302 is provided with a first conical surface 303 , and the side wall of the first channel 101 is provided with a second conical surface 103 matched with the first conical surface 303 .

[0058] In some specific embodiments of the present invention, referring to Figure 3 , Figure 4 and Figure 7The first conical surface 303 is arranged on the top surface of the valve stem portion 302, and the second conical surface 103 is arranged at the corner of the vertical section 112 and the horizontal section 113. When the control valve is closed, the valve stem portion 302 extends into the vertical section 112, and the first conical surface 303 abuts against the second conical surface 103, and the original plane seal between the valve stem portion 302 and the valve body 1 is adjusted to a conical surface seal. This setting has a better sealing effect and is more conducive to blocking the flow of liquid in the first channel 101.

[0059] In addition, during actual use, the conical surface structure may wear out over time or with an increase in the number of opening and closing times. Therefore, the valve stem portion 302 can be connected to the piston portion 301 by a threaded connection, or the valve stem portion 302 can be set as two parts and connected by a fixing method such as a snap connection or a threaded connection, which is convenient for replacement during actual use.

[0060] Figure 6 for Figure 1 Schematic diagram of the structure of the middle supporting component.

[0061] In some embodiments of the present invention, referring to Figure 1 and Figure 3 The piston control valve also includes a supporting component 5, which is arranged in the first channel 101, the supporting component 5 abuts against the side wall of the valve stem portion 302, and the supporting component 5 is arranged on a side of the first channel 101 close to the inlet end of the first channel 101.

[0062] In some specific embodiments of the present invention, referring to Figure 3 , Figure 4 , Figure 6 and Figure 7The supporting component 5 is symmetrically arranged in two groups, and the supporting component 5 includes: a first spring 501 and a sliding block 502. Two symmetrical grooves are arranged on the side wall of the vertical section 112, and the grooves are located on the upper side of the second conical surface 103. The sliding block 502 is slidably arranged in the grooves. The two ends of the first spring 501 are respectively abutted on the side walls of the grooves and the sliding block 502. The side surface of the sliding block 502 close to the vertical section 112 is arranged as an arc surface, and the bottom side surface of the sliding block 502 close to the axis of the vertical section 112 is chamfered. The top of the valve stem portion 302 is provided with a convex column portion 307, and the convex column portion 307 is provided with a convex surface. The sliding block 502 is provided with a concave surface, and the convex surface and the concave surface can be fitted together. When closed, the valve stem portion 302 moves upward and extends into the vertical section 112, and the first conical surface 303 and the second conical surface 103 abut against each other. At this time, the convex column portion 307 is located between the two sliding blocks 502. Since the concave surface of the sliding block 502 and the convex surface of the convex column portion 307 can fit together, the sliding block 502 abuts against the side surface of the convex column portion 307 under the action of the first spring 501, and the concave surface of the sliding block 502 and the convex surface of the convex column portion 307 fit together. At this time, the outer wall of the convex column portion 307 is subjected to the pressure of the first spring 501 and the pressure obtained by multiplying the pressure of the fluid and the actual effective area of ​​the contact surface. In this way, part of the pressure of the fluid on the valve body 1 can be converted into the friction force between the sliding block 502 and the convex column portion 307, so that the valve core 3 can withstand stronger pressure when the control valve is closed.

[0063] In some embodiments of the present invention, referring to Figure 4 The first conical surface 303 is provided with a first protrusion 304, and the number of the first protrusion 304 is at least one.

[0064] In some specific embodiments of the present invention, referring to Figure 3 and Figure 4 , the first protrusion 304 is circular, and the cross section of the first protrusion 304 is arc-shaped. The first protrusion 304 is coaxially fixedly arranged on the first conical surface 303. In this way, the conical surface contact between the valve core 3 and the valve body 1 is adjusted to the circumferential line contact between the first protrusion 304 and the second conical surface 103, and the sealing effect is better. In addition, the first protrusion 304 can be staggered and arranged in multiple positions, and the effectiveness of the line seal can be ensured. And a chamfer is provided between the first protrusion 304 and the first conical surface 303, so that impurities are prevented from accumulating at the corner between the first protrusion 304 and the first conical surface 303 to damage the surface of the first protrusion 304.

[0065] In some embodiments of the present invention, referring to Figure 4The first conical surface 303 is provided with a second protrusion 305, at least one second protrusion 305 is provided, and the first protrusion 304 is a hard protrusion, and the second protrusion 305 is a soft protrusion.

[0066] In some specific embodiments of the present invention, referring to Figure 4 The second protrusion 305 is staggered with the first protrusion 304, and the height of the second protrusion 305 on the first conical surface 303 is higher than the height of the first protrusion 304, that is, when closed, the second protrusion 305 first contacts the second conical surface 103. This arrangement can increase flexible sealing on the basis of conical surface line sealing to ensure the sealing effect.

[0067] Figure 5 for Figure 1 Schematic diagram of the structure of the valve core and sealing ring.

[0068] In some embodiments of the present invention, referring to Figure 4 and Figure 5 The sealing member 4 includes an isolating ring 401 and at least two first sealing rings 402. The isolating ring 401 is provided with a second through hole for the valve stem portion 302 to pass through. At least one of the first sealing rings 402 is arranged between the valve stem portion 302 and the isolating ring 401, and at least one of the first sealing rings 402 is arranged between the isolating ring 401 and the valve body 1.

[0069] In some specific embodiments of the present invention, referring to Figure 4 , Figure 5 and Figure 7 A circular groove is provided on the side wall of the horizontal section 113 at the first through hole 102, and the circular groove is coaxially arranged with the first through hole 102. The second through hole is concentrically arranged on the isolation ring 401, and the isolation ring 401 is fixedly arranged in the circular groove. Two first sealing rings 402 are provided, and two annular grooves are provided on the isolation ring 401, one of which is arranged between the valve stem portion 302 and the isolation ring 401, and the other annular groove is arranged between the isolation ring 401 and the valve body 1, and the two first sealing rings 402 are respectively arranged in the two annular grooves.

[0070] In some embodiments of the present invention, referring to Figure 1 and Figure 4 An overflow hole 104 is provided on the valve body 1 , one end of the overflow hole 104 is communicated with the outside, and the other end of the overflow hole 104 extends to the isolation ring 401 or the first through hole 102 .

[0071] In some specific embodiments of the present invention, referring to Figures 3 to 5The overflow hole 104 is arranged on one side of the first through hole 102, the diameter of the upper part of the first through hole 102 is larger than that of the lower part, and one end of the overflow hole 104 is connected with the upper part of the first through hole 102. This arrangement enables the fluid flowing to the piston part 301 through the gap between the isolation ring 401 and the valve stem part 302 or the valve body 1 to be guided to the outside of the valve body 1 through the overflow hole 104, thereby preventing the fluid from flowing into the slide groove 201 and affecting the piston part 301.

[0072] In some embodiments of the present invention, referring to Figure 1 Zhihe Figure 3 A third channel 203 is provided on the base 2 , and the third channel 203 is communicated with a side of the slide groove 201 close to the valve stem portion 302 .

[0073] In some specific embodiments of the present invention, referring to Figure 1 Zhihe Figure 3 One end of the third channel 203 is connected to the top side wall of the slide groove 201, and the other end of the third channel 203 extends to the side wall of the base 2. The third channel 203 is provided to expand the space where the air in the slide groove 201 on the upper side of the piston part 301 can move, reduce the reaction force of the squeeze space on the piston part 301 when the valve core 3 moves upward, and also can increase the positive pressure or negative pressure on the third channel 203 to assist in opening the control valve or increase the sealing strength.

[0074] In some embodiments of the present invention, referring to Figure 1 , Figure 3 and Figure 4 The valve body 1 includes a valve cover 105 and a valve seat 106, the first channel 101 includes a first section 107, a second section 108 and a third section 109, the valve cover 105 is arranged on the valve seat 106, the valve seat 106 is arranged on the base 2, the first section 107 is arranged in the valve cover 105, the second section 108 and the third section 109 are arranged in the valve seat 106, one end of the second section 108 is communicated with the first section 107, and the other end of the second section 108 is communicated with the third section 109.

[0075] In some specific embodiments of the present invention, referring to Figures 1 to 4 and Figure 7The valve cover 105 is provided with a countersunk hole, the valve seat 106 is provided with a threaded hole, the valve seat 106 and the valve cover 105 are fixedly connected by bolts, and the base 2 is provided with a through hole coaxially arranged with the threaded hole on the valve seat 106, and the bolt can be fixed on other structures when connecting the valve cover 105 and the valve seat 106, the first section 107 and the second section 108 are located on the vertical section 112, the third section 109 is located on the horizontal section 113, and the first section 107 is arranged on the valve cover 105. The second section 108 and the third section 109 are arranged on the valve seat 106, the top of the first section 107 is the inlet end of the first channel 101, the left side end of the third section 109 is the outlet end of the first channel 101, and the isolation ring 401 is arranged on the lower side of the right side end of the third section 109. The diameter of the second section 108 is not less than the diameter of the seal 4. This arrangement is convenient for installation, and the seal 4 can also be repaired and replaced by disassembling the valve cover 105 and the valve seat 106.

[0076] In some embodiments of the present invention, referring to Figures 1 to 4 and Figure 6 The valve body 1 also includes a sealing ring 110 and at least two second sealing rings 111. The sealing ring 110 is provided with a third through hole. The sealing ring 110 is arranged in at least one of the valve cover 105 and the valve seat 106. The third through hole is connected to at least one of the first section 107 and the second section 108. At least one second sealing ring 111 is arranged between the sealing ring 110 and the valve cover 105, and at least one second sealing ring 111 is arranged between the sealing ring 110 and the valve seat 106.

[0077] In some specific embodiments of the present invention, referring to Figures 1 to 4 and Figure 6The sealing ring 110 is made of one of stainless steel, aluminum alloy or aluminum-magnesium-copper alloy. A mounting groove is provided on the top side wall of the second section 108, and the sealing ring 110 is arranged in the mounting groove. The sealing ring 110 is arranged in a circular ring shape. The diameter of the sealing ring 110 is greater than the diameter of the second section 108. The sealing ring 110 and the first section 107 are coaxially arranged. The third through hole is coaxially and penetrated on the sealing ring 110. The two ends of the third through hole are respectively communicated with the first section 107 and the second section 108. The second cone surface 103 is arranged on the lower side of the sealing ring 110. Two annular grooves are provided on the sealing ring 110, one of which is arranged between the sealing ring 110 and the valve cover 105, and the other is arranged between the sealing ring 110 and the valve seat 106. Two second sealing rings 111 are respectively arranged in the two annular grooves. The clamping groove is arranged on the sealing ring 110, and the outer end of the first spring 501 abuts against the sealing ring 110. This arrangement facilitates the replacement of the structure of the second cone surface 103, and also facilitates the replacement or maintenance of the abutting assembly 5.

[0078] Figure 7 FIG. 1 is a schematic cross-sectional view of a piston type control valve in a second embodiment of the present invention. Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point B in the middle.

[0079] In some embodiments of the present invention, reference Figure 1 , Figure 5 and Figure 7 , Figure 7 and Figure 8 The piston control valve Figure 1-6 The difference of the piston control valve is: Figure 7 and Figure 8 The lip seal ring 306 is disposed on the valve stem portion 302 or the first channel 101 in the piston type control valve, and the lip seal ring 306 abuts against the side wall of the first channel 101 or the valve stem portion 302 .

[0080] In some specific embodiments of the present invention, reference is made to Figure 3 , Figure 4 , Figure 7 and Figure 8The lip seal ring 306 is made of rubber or plastic material. The lip seal ring 306 is arranged at the top of the valve stem 302. The lip seal ring 306 includes: an outer ring 308 and an inner ring 309. The diameter of the outer ring 308 is larger than the diameter of the second section 108 and the inner ring 309. The outer diameter of the inner ring 309 is larger than the diameter of the second section 108. When the control valve needs to be closed, the second channel 202 is pressurized to move the valve core 3 upward. As the valve core 3 moves, the inner ring 309 is squeezed with the side wall of the second section 108, and the inner ring 309 is deformed inward and enters In the second section 108, as the valve core 3 continues to move upward, the outer ring 308 abuts against the side wall of the third section 109 to close the control valve. This arrangement enables the force of the valve core 3 to act on the side wall of the first channel 101 through the outer ring 308. At the same time, the inner ring 309 is subjected to the outward pressure of the fluid and its own outward expansion elastic force, so that friction is formed between the inner ring 309 and the side wall of the second section 108, and the friction is stronger as the pressure of the fluid increases. This arrangement has a better sealing effect and can reduce the influence of impurities in the fluid on the seal.

[0081] Fig. 9 It is a schematic cross-sectional structure diagram of a piston type control valve in the third embodiment of the present invention.

[0082] In some embodiments of the present invention, reference Figure 1 , Figure 4 and Fig. 9 , Fig. 9 The piston control valve Figure 1-6 The difference of the piston control valve is: Fig. 9 The sealing member 4 in the piston control valve includes the bellows 403 , which is sleeved on the valve stem 302 , and one end of the bellows 403 is fixed to the valve stem 302 , and the other end of the bellows 403 is fixed to the side wall of the first channel 101 .

[0083] In some specific embodiments of the present invention, reference is made to Figure 1 , Figure 3 , Figure 4 and Fig. 9The bellows 403 is made of elastic material, and is sleeved on the valve stem 302. The bottom end of the bellows 403 is sealed and fixedly arranged on the bottom side wall of the third section 109, and the top end of the bellows 403 is sealed and fixedly arranged on the valve stem 302. As the valve stem 302 moves, the bellows 403 follows the expansion and contraction, and the two ends are fixedly sealed, so the sealing effect is better, which prevents the fluid from flowing to the slide groove 201 through the gap between the valve stem 302 and the valve body 1.

[0084] Fig.10 It is a schematic cross-sectional structure diagram of a piston type control valve in a fourth embodiment of the present invention.

[0085] In some embodiments of the present invention, referring to Fig.10 and Figure 3 , Fig.10 The piston control valve Figure 1-6 The difference of the piston control valve is: Fig.10 The piston-type control valve further includes an elastic member 6 , which is disposed in the slide groove 201 , and one end of the elastic member 6 abuts against a side surface of the piston portion 301 away from the valve stem portion 302 .

[0086] In some specific embodiments of the present invention, referring to Figure 3 and Fig.10 The elastic member 6 is a second spring 601 . An annular groove is provided at the inner bottom of the slide groove 201 . The second spring 601 is arranged in the annular groove. The top of the second spring 601 abuts against the piston part 301 .

[0087] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A piston control valve, characterized in that: include: A base having a slide groove therein; A valve body, arranged on the base, comprising a first channel, having a first section coaxially arranged with the slide groove and located at the top thereof, a third section arranged perpendicularly to the first section, and a second section coaxially arranged with the first section and connected with the first section and the third section, wherein a working medium flows through the fluid, and a first through hole, located at the bottom of the valve body and coaxially arranged with the first section and the second section; A valve core, comprising a coaxially arranged piston portion and a valve stem portion, wherein the piston portion is slidably arranged in the slide groove, and an end of the valve stem portion away from the piston portion extends to the first channel through the first through hole; an abutting assembly, disposed in the first channel and abutting against a side wall of the valve stem, wherein the abutting assembly is disposed on a side of the first channel close to an inlet end of the first channel; An elastic member is disposed in the slide groove, and one end of the elastic member abuts against a side surface of the piston portion away from the valve stem portion; as well as A second channel is provided on the bottom of the base, the second channel is communicated with the slide groove, The second channel is used to provide positive pressure or negative pressure in the slide groove, so as to make the piston part approach or move away from the first channel, and make the valve stem part block the first channel or make the first channel connected.

2. The piston type control valve according to claim 1, characterized in that: It also includes a sealing member, which is arranged in the first channel and is used to seal the valve stem portion and the first through hole.

3. The piston type control valve according to claim 2, characterized in that: The valve stem is provided with a first conical surface, and the side wall of the first channel is provided with a second conical surface matched with the first conical surface.

4. The piston type control valve according to claim 3, characterized in that: The first conical surface is provided with a first protrusion, and the number of the first protrusion is at least one.

5. The piston type control valve according to claim 4, characterized in that: The first conical surface is provided with a second protrusion, the number of the second protrusion is at least one, the first protrusion is a hard protrusion, and the second protrusion is a soft protrusion.

6. The piston type control valve according to claim 3, characterized in that: A lip seal ring is provided on the valve stem portion or the first channel, and the lip seal ring abuts against the side wall of the first channel or the valve stem portion.

7. The piston control valve according to any one of claims 2 to 6, characterized in that: The sealing member comprises an isolating ring and at least two first sealing rings; The isolation ring is provided with a second through hole for the valve stem to pass through, at least one of the first sealing rings is arranged between the valve stem and the isolation ring, and at least one of the first sealing rings is arranged between the isolation ring and the valve body.

8. The piston type control valve according to claim 7, characterized in that: The valve body is provided with an overflow hole, one end of the overflow hole is communicated with the outside, and the other end of the overflow hole extends to the isolation ring or the first through hole.

9. The piston type control valve according to any one of claims 2 to 6, characterized in that: The sealing member comprises a bellows, which is sleeved on the valve stem, one end of which is fixed to the valve stem, and the other end of which is fixed to the side wall of the first channel.

10. The piston type control valve according to any one of claims 2 to 6, characterized in that: The base is provided with a third channel, and the third channel is communicated with a side of the slide groove close to the valve stem portion.

11. The piston type control valve according to any one of claims 2 to 6, characterized in that: The valve body comprises a valve cover and a valve seat; The valve cover is arranged on the valve seat, the valve seat is arranged on the base, the first section is arranged in the valve cover, the second section and the third section are arranged in the valve seat, one end of the second section is connected to the first section, and the other end of the second section is connected to the third section.

12. The piston type control valve according to claim 11, characterized in that: The valve body also includes a sealing ring and at least two second sealing rings; The sealing ring is provided with a third through hole, and the sealing ring is arranged on at least one of the valve cover and the valve seat. The third through hole is connected to at least one of the first section and the second section, at least one second sealing ring is arranged between the sealing ring and the valve cover, and at least one second sealing ring is arranged between the sealing ring and the valve seat.

Images