Hydraulic electromagnetic valve with position monitoring function

Abstract

The invention relates to a hydraulic electromagnetic valve with a position monitoring function, which comprises a valve body, a shell, a pipe core and a detection device, and the valve body is connected with the pipe core; the tube core is sleeved with the shell, and an electromagnetic coil is arranged in the shell; the electromagnetic coil is sleeved on the tube core; an armature is arranged in the tube core in a sliding manner; a copper ring is embedded in a preset position on the inner wall of the tube core; and at least two detection electrodes are axially embedded in the inner wall of the copper ring. According to the detection device, the position of the armature can be obtained according to whether the capacitance of the metal ring at the position is changed or not and the capacitance value of the metal ring at the position detected by each detection electrode, so that the position of the valve element is obtained, and whether the electromagnetic valve breaks down or not is judged.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic valve technology, and specifically relates to a hydraulic electromagnetic valve with position monitoring function. Background Technology

[0002] A hydraulic solenoid valve is a directional control valve in a hydraulic transmission system that controls the flow direction of fluid. A typical hydraulic solenoid valve includes a valve body containing a valve core, and an electromagnet assembly on one or both sides of the valve body. The electromagnet assembly includes a tube core with an electromagnetic coil mounted on it. When the electromagnet coil is energized, it drives an armature inside the tube core to move, which in turn moves the valve core, thus opening or closing the flow chamber. However, a typical hydraulic solenoid valve cannot determine the position of the valve core to identify whether a malfunction has occurred. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic solenoid valve with a position monitoring function, which can detect the position of the armature and indirectly detect the position of the valve core, thereby determining whether the hydraulic solenoid valve has malfunctioned.

[0004] To achieve the above objectives, the present invention provides a hydraulic solenoid valve with position monitoring function, comprising a valve body, a housing, and a core.

[0005] The valve body is connected to the tube core; the housing is sleeved on the tube core, and an electromagnetic coil is provided inside the housing; the electromagnetic coil is sleeved on the tube core; an armature is slidably arranged inside the tube core;

[0006] It also includes a detection device, which is ring-shaped; the detection device is sleeved on the core tube and is located on the side of the housing away from the valve body; a metal ring is embedded in the inner wall of the core tube; the metal ring is electrically connected to the detection device; at least two detection electrode groups are axially embedded in the inner wall of the metal ring; each detection electrode group includes at least one detection electrode distributed along the circumference of the metal ring; each detection electrode is electrically connected to the detection device.

[0007] The present invention also provides a hydraulic solenoid valve with position monitoring function, comprising a valve body, two housings and two cores.

[0008] The valve body is connected to two tube cores at both ends; two housings are respectively fitted onto the two tube cores, and each housing is provided with an electromagnetic coil; the electromagnetic coil is fitted onto the tube core; an armature is slidably arranged inside the tube core;

[0009] It also includes two detection devices, both of which are annular; the two detection devices are sleeved on corresponding cores and are located on the side of the housing away from the valve body; the inner walls of the two cores are each embedded with a metal ring; the two metal rings are electrically connected to the corresponding detection devices respectively; at least two detection electrode groups are axially embedded in the inner walls of the metal rings; each detection electrode group includes at least one detection electrode distributed along the circumference of the metal ring; each detection electrode is electrically connected to the corresponding detection device.

[0010] Preferably, the detection electrodes at both ends of the metal ring are respectively located in the attraction sensing area and the reset sensing area.

[0011] Preferably, a nut is connected to the end of the tube core away from the valve body.

[0012] Preferably, the detection device is equipped with an indicator light.

[0013] Preferably, sealing rings are fixed at both ends of the inner hole of the detection device.

[0014] Preferably, the inside of the outer shell of the detection device forms a potting area, and the potting area is encapsulated with epoxy resin.

[0015] Preferably, a potting area is formed inside the housing, and the potting area is encapsulated with epoxy resin.

[0016] The detection device of the present invention can determine the position of the armature by detecting whether the capacitance of the metal ring at each detection electrode changes and the capacitance value of the metal ring at that position, thereby determining the position of the valve core and judging whether the solenoid valve is malfunctioning. Furthermore, when the A-end electromagnetic coil is de-energized and the B-end electromagnet is energized, the end of the A-end armature furthest from the valve body enters the reset sensing area. The detection electrode at this location detects a change in the capacitance of the metal ring at that position. Simultaneously, the end of the B-end armature furthest from the valve body passes through the attraction sensing area, and the detection electrode at this location detects a change in the capacitance of the metal ring at that position. This indicates normal operation. When the A-end electromagnetic coil is energized and the B-end electromagnetic coil is de-energized, the end of the A-end armature furthest from the valve body passes through the attraction sensing area, and the end of the B-end armature furthest from the valve body enters the reset sensing area. The two detection electrodes detect changes in the capacitance of the metal ring at their respective positions, indicating normal operation. When one side of the electromagnet is working and de-energized, if the A-end electromagnet is de-energized, the end of the A-end armature furthest from the valve body enters the reset sensing area, causing the indicator light corresponding to that reset sensing area to illuminate, facilitating maintenance personnel to observe whether the solenoid valve is working properly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Example 1;

[0018] Figure 2This is an enlarged view of Example 1;

[0019] Figure 3 This is a schematic diagram of the structure of Example 2;

[0020] Figure 4 for Figure 3 Enlarged view on the left;

[0021] Figure 5 for Figure 3 Enlarged view on the right;

[0022] Figure 6 This is a schematic diagram of the attraction sensing area and the reset sensing area. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] like Figures 1-2 As shown, a hydraulic solenoid valve with position monitoring function includes a valve body 1, a housing 17, a core 16, and a detection device 14.

[0026] The valve body 1 is connected to the core tube 16. A valve core 2 is slidably mounted inside the valve body 1. The movement of the valve core 2 opens or closes the flow passage inside the valve body 1. Springs are connected to both ends of the valve core 2. The housing 17 is fitted onto the core tube 16, and an electromagnetic coil 5 is installed inside the housing 17. The electromagnetic coil 5 is fitted onto the core tube 16. An armature 6 is slidably mounted inside the core tube 16. The armature 6 contacts the valve core 2 via a push rod. This hydraulic solenoid valve is a two-position hydraulic solenoid valve. Figure 1 As shown, when the electromagnetic coil 5 is energized, the armature 6 slides towards the valve body 1, pushing the valve core 2 to move. The end of the armature 6 away from the valve body 1 passes through the attraction sensing area of ​​the core 16, and the spring on the side of the valve body 1 away from the housing 17 is compressed. When the electromagnetic coil 5 is de-energized, the spring resets, pushing the valve core 2 to move, and the armature 6 slides away from the valve body 1. The end of the armature 6 away from the valve body 1 enters the reset sensing area of ​​the core 16, and the valve core 2 moves to the center position. The movement of the valve core 2 realizes the interruption or switching of oil flow.

[0027] The detection device 14 is annular; the detection device 14 is sleeved on the core tube 16 and is located on the side of the housing 17 away from the valve body 1;

[0028] A metal ring 11 is embedded in the inner wall of the core 16. After the electromagnetic coil 5 is de-energized, the armature 6 slides away from the valve body 1, passing through the metal ring 11, which can be a copper ring. The metal ring 11 is electrically connected to the detection device 14, wherein the metal ring 11 is connected to the detection device 14 via a wire passing through the core 16, and the detection device 14 is connected to an external power source. At least two detection electrode groups are axially embedded in the inner wall of the metal ring 11. Each detection electrode group includes at least one detection electrode 12 distributed circumferentially along the metal ring 11. The detection electrodes 12 at both ends of the metal ring 11 can be respectively set in the attraction sensing area and the reset sensing area; each of the detection electrodes 12 is electrically connected to the detection device 14. When the armature 6 moves onto the metal ring 11, the capacitance of the metal ring 11 will change. The detection device 14 can determine the position of the armature 6 based on whether the capacitance of the metal ring 11 at each detection electrode 12 changes and the capacitance value of the metal ring 11 at that position, thereby determining the position of the valve core 2, judging whether the solenoid valve has malfunctioned, and if the solenoid coil 5 is de-energized, such as Figure 6 As shown, if the detection electrode 12 in the reset sensing area detects a change in the capacitance of the metal ring 11 at that position, it is considered to be working normally. If the detection electrode 12 in the attraction sensing area detects a change in the capacitance of the metal ring 11 at that position after the electromagnetic coil 5 is energized, it is considered to be working normally; otherwise, it is considered that the solenoid valve has malfunctioned.

[0029] In this embodiment, a nut 10 is connected to the end of the core 16 away from the valve body 1, and the detection device 14 and the housing 17 are fixed by tightening the nut 10.

[0030] In this embodiment, the detection device 14 is equipped with an indicator light 7. When the armature 6 moves, the detection electrode senses the change in capacitance. According to the position of the armature 6, the indicator light 7 changes color or turns on and off. The indicator light 7 can conveniently indicate whether the armature 6 has moved to the predetermined position, making it convenient for maintenance personnel to check at any time.

[0031] In this embodiment, sealing rings 13 and 15 are fixed at both ends of the inner hole of the detection device 14. The two sealing rings 13 and 15 enhance the waterproof performance and prevent water from entering.

[0032] In this embodiment, the outer shell 8 of the detection device 14 forms a potting area 9. The potting area 9 is encapsulated with epoxy resin without affecting the normal operation of the detection device 14. By encapsulating the detection device 14 with epoxy resin, the waterproofness of the detection device 14 is further enhanced.

[0033] Example 2:

[0034] like Figures 3-5As shown, a hydraulic solenoid valve with position monitoring function includes a valve body 1, two housings 17, two cores 16, and two detection devices 14.

[0035] The valve body 1 is connected to two tube cores 16 at both ends. A valve core 2 is slidably disposed inside the valve body 1. The movement of the valve core 2 can open or close the flow passage inside the valve body 1. A spring is connected to both ends of the valve core 2, and the two springs are respectively connected to the corresponding tube core 16. Two housings 17 are respectively sleeved on the two tube cores 16, and each of the two housings 17 is provided with an electromagnetic coil 5. The electromagnetic coil 5 is sleeved on the tube core 16. An armature 6 is slidably disposed inside the tube core 16, and both armatures 6 are in contact with the valve core 2 through push rods.

[0036] This hydraulic solenoid valve is a three-position hydraulic solenoid valve, such as Figure 3 and 6 As shown, the two ends of the valve body 1 are designated as end A and end B, respectively. When the electromagnetic coil 5 at end A is energized and the electromagnetic coil 5 at end B is de-energized, the armature 6 at end A slides towards the valve body 1, pushing the valve core 2 to move towards end B. The armature 6 at end B slides away from the valve body 1. The end of the armature 6 at end A away from the valve body 1 passes through the attraction sensing area of ​​the core 16, and the end of the armature 6 at end B away from the valve body 1 enters the reset sensing area. When the electromagnetic coil 5 at end A is de-energized and the electromagnetic coil 5 at end B is energized, the armature 6 at end B slides towards the valve body 1, pushing the valve core 2 to move towards end A. The armature 6 at end A slides away from the valve body 1. The end of the armature 6 at end B away from the valve body 1 passes through the attraction sensing area of ​​the core 16, and the end of the armature 6 at end A away from the valve body 1 enters the reset sensing area. When both the electromagnetic coils 5 at end A and end B are de-energized, the springs at both ends of the valve core 2 move the valve core 2 to the center position, thereby switching the oil flow direction through the movement of the valve core 2.

[0037] Both of the detection devices 14 are annular; the two detection devices 14 are sleeved on the corresponding cores 16 and are located on the side of the housing 17 away from the valve body 1;

[0038] The inner walls of the two cores 16 are embedded with metal rings 11. As the armature 6 slides away from the valve body 1, it passes through the metal rings 11, which can be copper rings. The two metal rings 11 are electrically connected to corresponding detection devices 14, with the metal rings 11 connected to the detection devices 14 via wires passing through the cores 16. The detection devices 14 are connected to an external power source. At least two sets of detection electrodes are axially embedded in the inner walls of the metal rings 11. Each set of detection electrodes includes at least one detection electrode 12 distributed circumferentially along the metal ring 11. The detection electrodes 12 at both ends of the metal ring 11 can be respectively located in an attraction sensing area and a reset sensing area. Each detection electrode 12 is electrically connected to the detection device 14. When the armature 6 moves onto the metal ring 11, the capacitance of the metal ring 11 changes. The detection device 14 can determine the position of the two armatures 6 by detecting whether a change is detected in the metal ring 11 at that position and by measuring the capacitance value of the metal ring 11 at that position using each detection electrode 12, thereby determining the position of the valve core 2 and whether the solenoid valve has malfunctioned.

[0039] Furthermore, if the electromagnetic coil 5 at end A is energized and the electromagnetic coil 5 at end B is de-energized, the detection electrode 12 in the reset sensing area at end B detects a change in the capacitance of the metal ring 11 at that position, and the detection electrode 12 in the attraction sensing area at end A also detects a change in the capacitance of the metal ring 11 at that position. This is considered normal operation. If the electromagnetic coil 5 at end A is de-energized and the electromagnetic coil 5 at end B is energized, the detection electrode 12 in the reset sensing area at end A detects a change in the capacitance of the metal ring 11 at that position, and the detection electrode 12 in the attraction sensing area at end B also detects a change in the capacitance of the metal ring 11 at that position. This is also considered normal operation. The two can corroborate each other. Otherwise, it is considered that the solenoid valve is malfunctioning.

[0040] In this embodiment, a nut 10 is connected to the end of the core 16 away from the valve body 1, and the detection device 14 and the housing 17 are fixed by tightening the nut 10.

[0041] In this embodiment, the detection device 14 is equipped with an indicator light 7. When the armature 6 moves, the detection electrode senses the change in capacitance. According to the position of the armature 6, the indicator light 7 changes color or turns on and off. The indicator light 7 can conveniently indicate whether the two armatures 6 have moved to the predetermined position, making it convenient for maintenance personnel to check at any time.

[0042] In this embodiment, sealing rings 13 and 15 are fixed at both ends of the inner hole of the detection device 14. The two sealing rings 13 and 15 enhance the waterproof performance and prevent water from entering.

[0043] In this embodiment, the outer shell 8 of the detection device 14 forms a potting area 9. The potting area 9 is encapsulated with epoxy resin without affecting the normal operation of the detection device 14. By encapsulating the detection device 14 with epoxy resin, the waterproofness of the detection device 14 is further enhanced.

[0044] Example 3:

[0045] Traditional electromagnetic coils typically use extrusion molding to encapsulate the coil and socket inside the casing. However, extrusion molding has limited fluidity, which can easily create voids. For example... Figure 1 As shown, a housing potting area 4 is formed inside the housing 17. The housing potting area 4 is potted with epoxy resin. The wire of the electromagnetic coil 5 passes through the housing potting area 4 and is connected to the waterproof socket 3 on the outside of the housing 17. By potting the housing 17 with epoxy resin, the waterproof performance of the housing 17 is enhanced. Other features are the same as in Embodiment 1 or Embodiment 2.

Claims

1. A hydraulic solenoid valve with position monitoring function, comprising a valve body (1), a housing (17), and a core (16). The valve body (1) is connected to the core (16); the housing (17) is sleeved on the core (16), and an electromagnetic coil (5) is provided inside the housing (17); the electromagnetic coil (5) is sleeved on the core (16); an armature (6) is slidably arranged inside the core (16). Its features are, It also includes a detection device (14), which is annular; the detection device (14) is sleeved on the core (16) and is located on the side of the housing (17) away from the valve body (1); a metal ring (11) is embedded in the inner wall of the core (16); the metal ring (11) is electrically connected to the detection device (14); at least two detection electrode groups are axially embedded in the inner wall of the metal ring (11); each detection electrode group includes at least one detection electrode (12) distributed circumferentially along the metal ring (11); each detection electrode (12) is electrically connected to the detection device (14).

2. A hydraulic solenoid valve with position monitoring function, comprising a valve body (1), two housings (17) and two cores (16). The valve body (1) is connected to two tube cores (16) at both ends respectively; two housings (17) are respectively fitted on the two tube cores (16), and each of the two housings (17) is provided with an electromagnetic coil (5); the electromagnetic coil (5) is fitted on the tube core (16); an armature (6) is slidably arranged in the tube core (16). Its features are, It also includes two detection devices (14), both of which are annular; the two detection devices (14) are sleeved on corresponding cores (16) and are located on the side of the housing (17) away from the valve body (1); the inner walls of the two cores (16) are each embedded with a metal ring (11); the two metal rings (11) are electrically connected to the corresponding detection devices (14); at least two detection electrode groups are axially embedded in the inner walls of the metal rings (11); each detection electrode group includes at least one detection electrode (11) distributed circumferentially along the metal ring (11); each detection electrode (12) is electrically connected to the corresponding detection device (14).

3. The hydraulic solenoid valve with position monitoring function according to claim 1 or 2, characterized in that, The detection electrodes (12) at both ends of the metal ring (11) are respectively set in the attraction sensing area and the reset sensing area.

4. The hydraulic solenoid valve with position monitoring function according to claim 1 or 2, characterized in that, The end of the core (16) away from the valve body (1) is connected to a nut (10).

5. The hydraulic solenoid valve with position monitoring function according to claim 1 or 2, characterized in that, The detection device (14) is equipped with an indicator light (7).

6. The hydraulic solenoid valve with position monitoring function according to claim 1 or 2, characterized in that, Both ends of the inner hole of the detection device (14) are fixed with sealing rings (13, 15).

7. The hydraulic solenoid valve with position monitoring function according to claim 1 or 2, characterized in that, The testing device (14) has a glue-filling area (9) inside its outer shell (8); the glue-filling area (9) is filled with epoxy resin.

8. The hydraulic solenoid valve with position monitoring function according to claim 1 or 2, characterized in that, The shell (17) has a shell potting area (4) inside; the shell potting area (4) is potted with epoxy resin.

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