Pressure-adjustable hydraulic electromagnetic valve

Abstract

The utility model is applied to the field of hydraulic electromagnetic valves, and particularly relates to a pressure-adjustable hydraulic electromagnetic valve. A first electromagnetic valve, a second electromagnetic valve, a first electric push rod, a first movable rod, a first pressure adjusting spring, a first piston, a second electric push rod, a second movable rod, a second piston, a second pressure adjusting spring, a third piston, a movable valve element, a sealing block, a liquid injection opening, a first overflow hole and a second overflow hole are additionally arranged; a first electromagnetic valve and a second electromagnetic valve operate, a first electric push rod and a second electric push rod push a first movable rod, a second movable rod, a first piston and a second piston to slide up and down correspondingly, a second pressure adjusting spring drives a third piston to slide up and down, the pressure of liquid can be adjusted, and use in different scenes is met; furthermore, liquid can flow out through the first overflow hole and the second overflow hole, two-stage pressure regulation of the pressure regulating valve is completed, and liquid outlet pressure regulation of the pressure regulating valve is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic solenoid valves, and specifically relates to an adjustable-pressure hydraulic solenoid valve. Background Technique

[0002] The electromagnetic overflow valve is a composite and multi-functional pressure control valve formed by combining a hydraulic solenoid valve and an overflow valve. The functions of the electromagnetic overflow valve are as follows: 1. Constant pressure overflow function: In a quantitative pump economizing regulation system, the quantitative pump supplies a constant flow rate. When the system pressure increases, the required flow rate will decrease. At this time, the overflow valve opens, allowing the excess flow to return to the fuel tank to ensure the outlet pressure of the overflow valve, that is, the pump outlet pressure is constant (the valve port usually opens steadily with the pressure). 2. Voltage stabilization function: The overflow valve is connected in series on the return oil path, and the overflow valve generates back pressure, increasing the stability of the moving parts. 3. System unloading function: A solenoid valve with a small overflow flow is connected in series to the remote control port of the overflow valve. When the electromagnet is energized, the remote control port of the overflow valve is connected to the fuel tank, and at this time the hydraulic pump unloads. The overflow valve acts as a unloading valve at this time. 4. Safety protection function: When the system is working normally, the valve is closed. Only when the load exceeds the specified limit (the system pressure exceeds the set pressure) does it open for overflow to provide overload protection and prevent the system pressure from increasing further (usually making the set pressure of the overflow valve 10% - 20% higher than the maximum working pressure of the system).

[0003] However, this technical solution cannot adjust the liquid outlet pressure of the hydraulic solenoid valve, cannot meet the use requirements in different scenarios, and has poor practicability. Content of the Utility Model

[0004] The purpose of the utility model is to provide an adjustable-pressure hydraulic solenoid valve to solve the problems raised in the above background technique.

[0005] To achieve the above object, the present utility model provides the following technical solution: An adjustable pressure hydraulic solenoid valve, including an overflow valve body and a connection valve body. A second solenoid valve is arranged on one side of the overflow valve body away from the connection valve body, and a first solenoid valve is arranged on one side of the connection valve body away from the overflow valve body. Activity cavities communicating with each other are provided inside both the overflow valve body and the connection valve body. A first electric push rod is arranged at the bottom of the overflow valve body within the activity cavity, and a second electric push rod is arranged at the top of the bottom of the connection valve body within the activity cavity. One end of the first electric push rod is connected to a first movable rod, and the end of the first movable rod away from the first electric push rod is connected to a first piston. One end of the second electric push rod is connected to a second movable rod, and the end of the second movable rod away from the second electric push rod is connected to a second piston. One end of the second piston is connected to a second pressure regulating spring, and one end of the second pressure regulating spring is connected to a third piston; An activity valve core is connected between the third piston and the first piston, and a sealing block is arranged on the outer periphery of the activity valve core; On both sides of the overflow valve body within the activity cavity, a first liquid outlet and a second liquid outlet for liquid discharge are respectively provided.

[0006] Preferably, first overflow holes and second overflow holes are respectively provided on both sides of the connection valve body. A first flow channel is provided on one side of the connection valve body where the first overflow hole is located. The first liquid outlet is connected between the first flow channel and the activity cavity. A second flow channel is provided on one side of the connection valve body where the second overflow hole is located. The second liquid outlet is connected between the second flow channel and the activity cavity. A liquid injection port is provided on one side of the overflow valve body. The liquid injection port, the activity cavity, the first liquid outlet, the first flow channel, and the first overflow hole are connected and communicated, and the liquid injection port, the activity cavity, the second liquid outlet, the second flow channel, and the second overflow hole are connected and communicated.

[0007] Preferably, the first flow channel communicates with the first overflow hole and the first liquid outlet.

[0008] Preferably, the second flow channel communicates with the second overflow hole and the second liquid outlet.

[0009] Preferably, the first flow channel is hermetically connected between the first liquid outlet and the first overflow hole, and the second flow channel is hermetically connected between the second liquid outlet and the second overflow hole.

[0010] Preferably, the first movable rod is sleeved with a first pressure regulating spring, and both ends of the first pressure regulating spring are respectively connected to the bottom end of the first piston and the bottom surface of the activity cavity.

[0011] Preferably, the first solenoid valve and the second electric push rod are electrically connected, and the second solenoid valve and the first electric push rod are electrically connected.

[0012] Preferably, the first piston, the second piston and the third piston are all sealingly and slidably connected to the movable cavity.

[0013] Preferably, the specification of the sealing block is larger than that of the first liquid outlet. When the sealing block moves to the first liquid outlet, the sealing block can block the first liquid outlet. The specifications of the first liquid outlet and the second liquid outlet are both smaller than that of the third piston. When the third piston moves to the first liquid outlet and the second liquid outlet respectively, the third piston can block the first liquid outlet and the second liquid outlet.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. An adjustable-pressure hydraulic solenoid valve. The present utility model adds a first solenoid valve, a second solenoid valve, a first electric push rod, a first movable rod, a first pressure-regulating spring, a first piston, a second electric push rod, a second movable rod, a second piston, a second pressure-regulating spring, a third piston, a movable valve core, a sealing block, a liquid injection port, a first overflow hole and a second overflow hole. By operating the first solenoid valve and the second solenoid valve, the first electric push rod and the second electric push rod respectively push the first movable rod and the second movable rod, the first piston and the second piston slide up and down, and the second pressure-regulating spring drives the third piston to slide up and down, so as to adjust the pressure of the liquid, meet the use in different scenarios, improve the practicability of the present utility model. Further, the liquid can flow out through the first overflow hole and the second overflow hole to complete the two-stage pressure regulation of the present utility model and realize the regulation of the liquid outlet pressure of the present utility model. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall internal structure of the present utility model;

[0017] In the figure: overflow valve body 1, connecting valve body 2, first solenoid valve 3, second solenoid valve 4, first electric push rod 5, first movable rod 6, first pressure-regulating spring 7, first piston 8, second electric push rod 9, second movable rod 10, second piston 11, second pressure-regulating spring 12, first overflow hole 13, first flow channel 14, first liquid outlet 15, second overflow hole 16, second flow channel 17, second liquid outlet 18, third piston 19, movable valve core 20, sealing block 21, liquid injection port 22, movable cavity 23. Detailed Embodiment

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the attached drawings. 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. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Figure 1 In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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.

[0021] As Figure 1 shown, an adjustable-pressure hydraulic solenoid valve in this embodiment includes an overflow valve body 1 and a connection valve body 2. A second solenoid valve 4 is arranged on one side of the overflow valve body 1 away from the connection valve body 2, and a first solenoid valve 3 is arranged on one side of the connection valve body 2 away from the overflow valve body 1. An interconnected movable cavity 23 is provided inside both the overflow valve body 1 and the connection valve body 2. A first electric push rod 5 is arranged at the bottom of the overflow valve body 1 in the movable cavity 23, and a second electric push rod 9 is arranged at the top of the connection valve body 2 in the movable cavity 23. One end of the first electric push rod 5 is connected to a first movable rod 6, and one end of the first movable rod 6 away from the first electric push rod 5 is connected to a first piston 8. One end of the second electric push rod 9 is connected to a second movable rod 10, and one end of the second movable rod 10 away from the second electric push rod 9 is connected to a second piston 11. One end of the second piston 11 is connected to a second pressure-regulating spring 12, and one end of the second pressure-regulating spring 12 is connected to a third piston 19. An active valve core 20 is connected between the third piston 19 and the first piston 8. A sealing block 21 is arranged on the outer periphery of the active valve core 20. By the operation of the first solenoid valve 3 and the second solenoid valve 4, the first electric push rod 5 and the second electric push rod 9 respectively push the first movable rod 6 and the second movable rod 10, the first piston 8 and the second piston 11 slide up and down, and the second pressure-regulating spring 12 drives the third piston 19 to slide up and down, which can adjust the pressure of the liquid, meet the use in different scenarios, and improve the practicability of the present utility model.

[0022] Further, first overflow holes 13 and second overflow holes 16 are respectively formed on both sides of the connection valve body 2. A first flow channel 14 is formed on one side of the connection valve body 2 where the first overflow hole 13 is located. The first liquid outlet 15 is connected between the first flow channel 14 and the movable cavity 23. A second flow channel 17 is formed on one side of the connection valve body 2 where the second overflow hole 16 is located. The second liquid outlet 18 is connected between the second flow channel 17 and the movable cavity 23. A liquid injection port 22 is formed on one side of the overflow valve body 1. When the third piston 19 blocks the second liquid outlet 15, the liquid injection port 22, the movable cavity 23, the first liquid outlet 15, the first flow channel 14 and the first overflow hole 13 are communicated with each other. When the sealing block 21 blocks the first liquid outlet 15, the liquid injection port 22, the movable cavity 23, the second liquid outlet 18, the second flow channel 17 and the second overflow hole 16 are communicated with each other. Further, the liquid can flow out through the first overflow hole 13 and the second overflow hole 16, completing the two-stage pressure regulation of the present utility model and realizing the regulation of the liquid outlet pressure of the present utility model.

[0023] Further, a first pressure regulating spring 7 is sleeved on the first movable rod 6. Two ends of the first pressure regulating spring 7 are respectively connected to the bottom end of the first piston 8 and the bottom surface of the movable cavity 23. By the reaction force of the first pressure regulating spring 7, it is convenient for the upward movement of the first piston 8, improving the convenience of the movement of the first piston 8 of the present utility model.

[0024] Further, the first electromagnetic valve 3 and the second electric push rod 9 are electrically connected, and the second electromagnetic valve 4 and the first electric push rod 5 are electrically connected. By electrically connecting the output ends of the first electromagnetic valve 3 and the second electromagnetic valve 4 to the input ends of the second electric push rod 9 and the first electric push rod 5 respectively, the pushing movements of the second electric push rod 9 and the first electric push rod 5 are realized, enhancing the pushing efficiency of the second electric push rod 9 and the first electric push rod 5 of the present utility model.

[0025] Further, the first piston 8, the second piston 11 and the third piston 19 are all hermetically and slidably connected to the movable cavity 23. By hermetically and slidably connecting the first piston 8, the second piston 11 and the third piston 19 to the movable cavity 23, the airtightness of the movable cavity 23 where the movable valve core 20 of the present utility model is located is improved, avoiding liquid leakage and affecting the operation of the first electric push rod 5 and the second electric push rod 9.

[0026] Further, the first flow channel 14 communicates with the first overflow hole 13 and the first liquid outlet 15, the second flow channel 17 communicates with the second overflow hole 16 and the second liquid outlet 18. The first flow channel 14 is hermetically connected between the first liquid outlet 15 and the first overflow hole 13, and the second flow channel 17 is hermetically connected between the second liquid outlet 18 and the second overflow hole 16, improving the airtightness of the first flow channel 14 and the second flow channel 17 and avoiding liquid leakage.

[0027] Further, the thickness of the sealing block 21 is greater than the diameter of the first liquid outlet 15. When the sealing block 21 moves to the first liquid outlet 15, the sealing block 21 can block the first liquid outlet 15. The diameters of both the first liquid outlet 15 and the second liquid outlet 18 are smaller than the thickness of the third piston 19. When the third piston 19 moves to the first liquid outlet 15, the third piston 19 can block the first liquid outlet 15. When the third piston 19 moves to the second liquid outlet 18, the third piston 19 can block the second liquid outlet 18. By sealing the second liquid outlet 18 with the sealing block 21, when the first liquid outlet 15 discharges liquid, it is avoided that the liquid flows out from the second liquid outlet 18. By sealing the first liquid outlet 15 with the third piston 19, when the second liquid outlet 18 discharges liquid, it is prevented that the liquid flows out from the first liquid outlet 15, thus completing the two-stage pressure regulation of the liquid.

[0028] Specific implementation method: The staff first connect the first solenoid valve 3, the second solenoid valve 4, the first electric push rod 5 and the second electric push rod 9 to an external power supply and an external controller through wires. By controlling the first solenoid valve 3, the operation of the second electric push rod 9 is controlled. The second electric push rod 9 can drive the second movable rod 10 to move up and down in the movable cavity 23, thereby adjusting the pressure of the discharged liquid. After the adjustment is completed, liquid is injected through the liquid injection port 22. The liquid can be injected into the movable cavity 23 outside the periphery of the movable valve core 2. By controlling the second solenoid valve 4, the first electric push rod 5 is controlled. The first electric push rod 5 can drive the first movable rod 6 to move up and down in the movable cavity 23. The movable valve core 20 can drive the liquid to move upward. At this time, the second pressure regulating spring 12 is compressed by force, and the third piston 19 moves upward. The liquid flows in from the first liquid outlet 15, increasing the pressure of the liquid. The third piston 19 continues to move upward. The first liquid outlet 15 can be blocked by the sealing block 21, preventing the liquid from flowing out from both the first liquid outlet 15 and the second liquid outlet 18 at the same time. The liquid flows out from the second liquid outlet 18, thus completing the two-stage pressure regulation of the liquid.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adjustable-pressure hydraulic solenoid valve, comprising an overflow valve body and a connection valve body, characterized in that: A second solenoid valve is arranged on one side of the overflow valve body away from the connection valve body, and a first solenoid valve is arranged on one side of the connection valve body away from the overflow valve body. Communication activity chambers are provided inside both the overflow valve body and the connection valve body. A first electric push rod is arranged at the bottom of the overflow valve body within the activity chamber, and a second electric push rod is arranged at the top of the bottom of the connection valve body within the activity chamber. One end of the first electric push rod is connected to a first movable rod, and the end of the first movable rod away from the first electric push rod is connected to a first piston. One end of the second electric push rod is connected to a second movable rod, and the end of the second movable rod away from the second electric push rod is connected to a second piston. One end of the second piston is connected to a second pressure regulating spring, and one end of the second pressure regulating spring is connected to a third piston; An activity valve core is connected between the third piston and the first piston, and a sealing block is arranged on the outer periphery of the activity valve core; On both sides of the overflow valve body within the activity chamber, a first liquid outlet and a second liquid outlet for liquid discharge are respectively provided.

2. An adjustable pressure hydraulic solenoid valve according to claim 1, characterized in that: A first overflow hole and a second overflow hole are respectively provided on both sides of the connection valve body. A first flow channel is provided on one side of the connection valve body where the first overflow hole is located. The first liquid outlet is connected between the first flow channel and the activity chamber. A second flow channel is provided on one side of the connection valve body where the second overflow hole is located. The second liquid outlet is connected between the second flow channel and the activity chamber. A liquid injection port is provided on one side of the overflow valve body. The liquid injection port, the activity chamber, the first liquid outlet, the first flow channel, and the first overflow hole are connected in communication. The liquid injection port, the activity chamber, the second liquid outlet, the second flow channel, and the second overflow hole are connected in communication.

3. An adjustable-pressure hydraulic solenoid valve according to claim 2, characterized in that: The first flow channel communicates with the first overflow hole and the first liquid outlet.

4. An adjustable pressure hydraulic solenoid valve according to claim 2, wherein: The second flow channel communicates with the second overflow hole and the second liquid outlet.

5. An adjustable-pressure hydraulic solenoid valve according to claim 2, characterized in that: The first flow channel is hermetically connected to the first liquid outlet and the first overflow hole, and the second flow channel is hermetically connected to the second liquid outlet and the second overflow hole.

6. An adjustable-pressure hydraulic solenoid valve according to claim 1, characterized in that: The first movable rod is sleeved with a first pressure regulating spring, and both ends of the first pressure regulating spring are respectively connected to the bottom end of the first piston and the bottom surface of the activity chamber.

7. An adjustable-pressure hydraulic solenoid valve according to claim 1, characterized in that: The first solenoid valve and the second electric push rod are electrically connected, and the second solenoid valve and the first electric push rod are electrically connected.

8. An adjustable-pressure hydraulic solenoid valve according to claim 1, characterized in that: The first piston, the second piston, and the third piston are all hermetically and slidably connected to the activity chamber.

9. An adjustable pressure hydraulic solenoid valve according to claim 1, characterized in that: The thickness of the sealing block is greater than the diameter of the first liquid outlet. When the sealing block moves to the first liquid outlet, the sealing block can block the first liquid outlet. The diameters of both the first liquid outlet and the second liquid outlet are smaller than the thickness of the third piston. When the third piston moves to the first liquid outlet, the third piston can block the first liquid outlet. When the third piston moves to the second liquid outlet, the third piston can block the second liquid outlet.

Images