Piston control valve

Abstract

The utility model discloses a piston control valve, belongs to the technical field of valves, and solves the problems that if fluid takes water as a solvent or the fluid drives certain corrosivity, a spring can be damaged to a certain degree, and finally the elastic deformation effect of the spring is lost. Comprising a valve body, a valve cover fixedly connected to the valve body, a valve cylinder fixedly connected to the valve cover and a valve bonnet fixedly connected with the valve cylinder, a piston is slidably connected in the valve cylinder and divides the portion between the valve cylinder and the valve bonnet into an upper space and a lower space, and the lower space is communicated with a feeding port of the valve body through a first water pipe. And the upper space is communicated with the discharge hole of the valve body through a second water pipe. The space volume is adjusted through the piston, the controller operates the servo motor to drive the water pump, the valve element moves to block or open a flow channel, the hydraulic sensor detects signals to control the solenoid valve to be powered off, it is ensured that the piston drives the valve element to abut against the valve body to be sealed, and the situation that a spring is damaged and fails does not need to be considered.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a piston control valve. Background Art

[0002] A piston control valve is a high-performance fluid control device, known for its unique piston seal structure. This valve uses the up and down movement of the piston to control the on-off or flow rate of the fluid. Its sealing performance is excellent, especially suitable for occasions that require precise control. The piston control valve mainly consists of components such as a valve body, a piston, a piston rod, a seal, a valve stem, and a valve core. The sealing surface of the piston usually uses hard materials such as stainless steel or ceramics to improve wear resistance and corrosion resistance.

[0003] When the control valve eliminates the water hammer phenomenon, the compression and expansion of the spring affect the blocking state between the valve core and the valve body. Currently, it basically affects the displacement change of the piston through the potential energy brought by the fluid impact, so that the piston drives the valve core to displace through the valve stem. However, this method basically relies on the spring. The spring is immersed in the fluid in the valve body for a long time. If the fluid uses water as a solvent or the fluid has certain corrosiveness, it will cause certain damage to the spring, ultimately resulting in the loss of its elastic deformation effect, causing the valve core and the piston to not be able to return to their original positions, and the valve core can only maintain the state of opening the flow channel in the valve body.

[0004] Therefore, a piston control valve is proposed to solve or alleviate the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies existing in the prior art and propose a piston control valve.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A piston control valve includes a valve body, a valve cover fixedly connected to the valve body, a valve barrel fixedly connected to the valve cover, and a valve cap fixedly connected to the valve barrel. A piston is slidably connected in the valve barrel. The piston divides the space between the valve barrel and the valve cap into an upper space and a lower space. The lower space is communicated with the feed port of the valve body through a first water pipe, and the upper space is communicated with the discharge port of the valve body through a second water pipe. The first water pipe and the second water pipe are respectively communicated with a first water pump and a second water pump.

[0008] Preferably, the first water pump and the second water pump respectively include a first servo motor and a second servo motor, and further include a controller, a first servo motor controller and a second servo motor controller. The output end of the controller is coupled to the input ends of the first servo motor controller and the second servo motor controller, and the output ends of the first servo motor controller and the second servo motor controller are respectively coupled to the input ends of the first servo motor and the second servo motor.

[0009] Preferably, the inlet of the second water pipe is located at the lowest horizontal height of the discharge port in the valve body.

[0010] Preferably, the second water pipe is provided to be switchable.

[0011] Preferably, it further includes a control circuit and a hydraulic sensor. A third water pipe communicating with the upper space is fixedly connected to the valve cap. The hydraulic sensor is arranged in the third water pipe. The input end of the control circuit is coupled to the output end of the hydraulic sensor, and the control circuit controls the on-off of the second water pipe.

[0012] Preferably, the control circuit includes a voltage comparison circuit, a trigger circuit, a relay, and a solenoid valve. The solenoid valve is connected in the second water pipe. The output end of the hydraulic sensor is coupled to the input end of the voltage comparison circuit. The output end of the voltage comparison circuit is coupled to the input end of the trigger circuit. The output end of the trigger circuit is coupled to the input end of the controller. The controller controls the on-off of the solenoid valve through the relay.

[0013] Preferably, the voltage comparison circuit is a voltage comparator, and the trigger circuit is an RS flip-flop.

[0014] Preferably, it further includes a valve stem and a valve core. One end of the valve stem is fixedly connected to the piston, and the valve stem penetrates through the valve cover into the valve body. The valve core is fixedly connected to the other end of the valve stem.

[0015] Preferably, a guide sleeve is communicated with the valve cap. One end of the piston away from the valve stem is fixedly connected with a guide rod slidably connected in the guide sleeve.

[0016] The utility model has the following beneficial effects:

[0017] The utility model adjusts the space volume through the piston. The controller operates the servo motor to drive the water pump to realize the displacement of the valve core to block or open the flow channel. The hydraulic sensor detects the signal to control the power-off of the solenoid valve, ensuring that the piston drives the valve core to tightly press against the valve body and then seal, without considering the situation of spring damage and failure. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a structural schematic diagram of the present utility model;

[0020] Figure 2 It is a structural block diagram of the control circuit in the present utility model.

[0021] 1. Valve body; 2. Valve cover; 3. Valve barrel; 4. Valve cap; 5. Guide sleeve; 6. Valve core; 7. Valve stem; 8. Piston; 9. Guide rod; 10. First water pipe; 11. First water pump; 12. Second water pipe; 13. Second water pump; 14. Solenoid valve; 15. Third water pipe; 16. Hydraulic sensor; 17. Controller; 18. Voltage comparison circuit; 19. Trigger circuit; 20. Relay; 21. First servo motor controller; 22. Second servo motor controller. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] A piston control valve, as Figure 1 shown, includes a valve body 1, a valve cover 2 fixedly connected to the valve body 1, a valve barrel 3 fixedly connected to the valve cover 2, a valve cap 4 fixedly connected to the valve barrel 3, a valve rod 7, and a valve core 6. A piston 8 is slidably connected in the valve barrel 3. One end of the valve rod 7 is fixedly connected to the piston 8, and the valve rod 7 passes through the valve cover 2 into the valve body 1. The valve core 6 is fixedly connected to the other end of the valve rod 7. A guide sleeve 5 is communicated with the valve cap 4. One end of the piston 8 away from the valve rod 7 is fixedly connected with a guide rod 9 that is slidably connected in the guide sleeve 5.

[0029] The piston 8 divides the space between the valve barrel 3 and the valve cap 4 into an upper space and a lower space. The lower space is communicated with the feed port of the valve body 1 through a first water pipe 10, and the upper space is communicated with the discharge port of the valve body 1 through a second water pipe 12. The inlet of the second water pipe 12 is located at the lowest horizontal height of the discharge port in the valve body 1. The second water pipe 12 is provided with an on-off function. The first water pipe 10 and the second water pipe 12 are respectively communicated with a first water pump 11 and a second water pump 13.

[0030] As Figure 2As shown, the first water pump 11 and the second water pump 13 respectively include a first servo motor and a second servo motor, and further include a controller 17, a first servo motor controller 21 and a second servo motor controller 22. The output end of the controller 17 is coupled to the input ends of the first servo motor controller 21 and the second servo motor controller 22, and the output ends of the first servo motor controller 21 and the second servo motor controller 22 are respectively coupled to the input ends of the first servo motor and the second servo motor.

[0031] As Figure 2 shown, it further includes a control circuit and a hydraulic sensor. A third water pipe 15 communicating with the upper space is fixedly connected to the valve cap 4. The hydraulic sensor is arranged in the third water pipe 15. The input end of the control circuit is coupled to the output end of the hydraulic sensor. The control circuit controls the on / off of the second water pipe 12. The control circuit includes a voltage comparison circuit 18, a trigger circuit 19, a relay 20, and a solenoid valve 14. The solenoid valve 14 is connected in the second water pipe 12. The output end of the hydraulic sensor is coupled to the input end of the voltage comparison circuit 18. The output end of the voltage comparison circuit 18 is coupled to the input end of the trigger circuit 19. The output end of the trigger circuit 19 is coupled to the input end of the controller 17. The controller 17 controls the on / off power of the solenoid valve 14 through the relay 20. The voltage comparison circuit 18 is a voltage comparator, and the trigger circuit 19 is an RS flip-flop.

[0032] When the utility model is actually used, the guide rod 9 and the guide sleeve 5 cooperate with the piston 8 to slide in the valve barrel 3, thereby adjusting the available volumes of the upper space and the lower space. When the liquid rushes from the feed port direction of the valve body 1 and impacts on the valve core 6, the valve core 6 can push the piston 8 to displace in the valve barrel 3 through the valve stem 7. At this time, the lower space increases and the upper space shrinks. Since there is sufficient liquid at the feed port of the valve body 1, the controller 17 can control the first servo motor controller 21 to control the first servo motor in the first water pump 11 to work, so as to further displace the piston 8 in the valve barrel 3 by liquid extrusion, open the flow channel in the valve body 1 by the valve core 6, and then stop the work of the first water pump 11. On the contrary, if the fluid volume decreases and the valve core 6 needs to block the flow channel in the valve body 1 again, at this time, the controller 17 can control the second servo motor controller 22 to control the second water pump 13 to work. Since the liquid volume in the discharge port of the valve body 1 will become less and less as the valve core 6 blocks, the second water pipe 12 with the inlet at the lowest horizontal height of the discharge port in the valve body 1 can fully cooperate with the second water pump 13 to suck the liquid into the upper space. Until after the valve core 6 blocks the flow channel in the valve body 1, a small part of the liquid still remains in the discharge port of the valve body 1 and will continue to be sucked into the upper space to increase the liquid pressure in the upper space. When the hydraulic sensor detects the hydraulic pressure in the upper space, it can send a hydraulic signal to the voltage comparator to compare with the reference hydraulic signal therein. When the hydraulic signal is greater than the reference hydraulic signal, the voltage comparison circuit 18 will send a comparison signal to the trigger circuit 19, and the trigger circuit 19 will also respond to the comparison signal and send a trigger signal to the controller 17. The controller 17 will control the relay 20 to cut off the power supply of the solenoid valve 14 through the decoder, so that the solenoid valve 14 remains in the closed state at this time, and the upper space maintains a high hydraulic pressure state, which can push the piston 8 and transmit the acting force to the valve core 6 to abut against the inner wall of the valve body 1 to block the flow channel of the valve body 1, ensuring the sealing effect. And in this process, there is no need to set a spring, avoiding the situation that the entire control valve fails after the spring is damaged.

[0033] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A piston control valve, comprising a valve body (1), a valve cover (2) fixedly connected to the valve body (1), a valve cylinder (3) fixedly connected to the valve cover (2), and a valve cap (4) fixedly connected to the valve cylinder (3), wherein a piston (8) is slidably connected inside the valve cylinder (3), and the piston (8) separates the valve cylinder (3) and the valve cap (4) to form an upper space and a lower space, and is characterized in that: The lower space is connected to the feed port of the valve body (1) via a first water pipe (10), and the upper space is connected to the discharge port of the valve body (1) via a second water pipe (12). The first water pipe (10) and the second water pipe (12) are respectively connected to a first water pump (11) and a second water pump (13).

2. A piston control valve according to claim 1, characterized in that: The first water pump (11) and the second water pump (13) respectively comprise a first servo motor and a second servo motor, and further comprise a controller (17), a first servo motor controller (21) and a second servo motor controller (22); the output end of the controller (17) is coupled to the input end of the first servo motor controller (21) and the second servo motor controller (22); the output ends of the first servo motor controller (21) and the second servo motor controller (22) are coupled to the input ends of the first servo motor and the second servo motor, respectively.

3. A piston control valve according to claim 1, characterized in that: The inlet of the second water pipe (12) is located at the lowest level of the discharge port in the valve body (1).

4. A piston control valve according to claim 2, characterized in that: The second water pipe (12) can be switched on and off.

5. A piston control valve according to claim 4, characterized in that: It also includes a control circuit and a hydraulic sensor. The valve cap (4) is fixedly connected to a third water pipe (15) communicating with the upper space. The hydraulic sensor is arranged in the third water pipe (15). The input end of the control circuit is coupled to the output end of the hydraulic sensor. The control circuit controls the on and off of the second water pipe (12).

6. A piston control valve according to claim 5, characterized in that: The control circuit comprises a voltage comparison circuit (18), a trigger circuit (19), a relay (20), and a solenoid valve (14); the solenoid valve (14) is connected to the second water pipe (12); the output end of the hydraulic sensor is coupled to the input end of the voltage comparison circuit (18); the output end of the voltage comparison circuit (18) is coupled to the input end of the trigger circuit (19); the output end of the trigger circuit (19) is coupled to the input end of the controller (17); and the controller (17) controls the on and off of power to the solenoid valve (14) through the relay (20).

7. A piston control valve according to claim 6, characterized in that: The voltage comparison circuit (18) is a voltage comparator, and the trigger circuit (19) is an RS trigger.

8. The piston control valve according to claim 1, characterized in that: It also includes a valve stem (7) and a valve core (6), one end of the valve stem (7) is fixedly connected to the piston (8), and the valve stem (7) passes through the valve cover (2) to the valve body (1), and the valve core (6) is fixedly connected to the other end of the valve stem (7).

9. A piston control valve according to claim 8, characterized in that: The valve cap (4) is connected to a guide sleeve (5), and one end of the piston (8) away from the valve stem (7) is fixedly connected to a guide rod (9) which is slidably connected in the guide sleeve (5).

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