Electromagnetic valve

Abstract

The electromagnetic valve comprises a valve body, an electromagnet assembly and a valve element assembly, the electromagnet assembly comprises an electromagnet, an iron core, a reset spring and a permanent magnet, the valve element assembly comprises a cone valve, the valve body is provided with an electromagnet installation cavity and a valve element installation cavity, the electromagnet assembly is installed in the electromagnet installation cavity, and the electromagnet is arranged around the permanent magnet and the iron core; the iron core is movably arranged in the electromagnet, the reset spring is clamped between the permanent magnet and one end of the iron core, the cone valve is movably installed in the valve element installation cavity, the cylindrical end of the cone valve is connected with the other end of the iron core, the valve body is further provided with an oil inlet and an oil outlet, the oil inlet is opposite to the conical end of the cone valve, and the oil outlet is communicated with the valve element installation cavity. The electromagnetic valve further comprises an end cover and an adjusting handle, the end cover is installed on the valve body, one end of the adjusting handle is movably inserted into the end cover, and one end of the adjusting handle is connected with the permanent magnet.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic valves, and in particular relates to a solenoid valve. Background Art

[0002] A solenoid valve is an industrial device controlled by electromagnetics and is often used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium.

[0003] The traditional solenoid valve includes a valve seat, a static iron core, a coil, a moving iron core and a spring. The valve seat is provided with a valve passage, the coil is wound around the static iron core, the moving iron core is movably mounted on the valve seat and matched with the valve passage, and the spring is arranged between the static iron core and the moving iron core. When the coil is energized, the static iron core generates an electromagnetic force, and the moving iron core is lifted from the valve passage by the electromagnetic force and compresses the spring, the valve passage is connected, and the valve is opened; when the coil is de-energized, the electromagnetic force disappears, the spring returns to its original state, and the spring force presses the moving iron core back to the valve passage, the valve passage is disconnected, and the valve is closed.

[0004] The valve opening of the traditional solenoid valve relies on the continuous power supply of the coil to push the moving iron core to overcome the spring restoring force, which consumes a lot of power. With the advent of the modern energy crisis, the country is also vigorously advocating the development of an energy-saving society, resulting in the traditional solenoid valve can no longer meet the demand for energy conservation. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a Solenoid valve. The solenoid valve is powered off. It can also maintain the open and closed state, realizing the self-maintaining function, with low power consumption and energy saving .

[0006] The technical solution adopted by the present invention is as follows.

[0007] A solenoid valve, the solenoid valve comprises a valve body, an electromagnet assembly and a valve core assembly, the electromagnet assembly comprises an electromagnet, an iron core, and a return spring, the valve core assembly comprises a cone valve ， The electromagnet assembly also includes a permanent magnet ，

[0008] The valve body is provided with an electromagnet installation cavity and a valve core installation cavity, and the electromagnet installation cavity is coaxially connected with the valve core installation cavity.

[0009] The electromagnet assembly is installed in the electromagnet installation cavity, the electromagnet is arranged around the permanent magnet and the iron core, the permanent magnet and the iron core are coaxial, the iron core is movably arranged in the electromagnet, and the return spring is clamped between the permanent magnet and one end of the iron core.

[0010] The cone valve is movably mounted in the valve core mounting cavity, and the cylindrical end of the cone valve is connected to the other end of the iron core.

[0011] The valve body is also provided with an oil inlet and an oil outlet, the oil inlet is coaxially connected with the valve core installation cavity, the oil inlet is opposite to the conical end of the cone valve, the oil outlet is connected with the valve core installation cavity, and the oil outlet is located on the moving track of the cone valve in the valve core installation cavity.

[0012] The permanent magnet is movably arranged in the electromagnet, and the solenoid valve further includes an end cover and an adjustment handle.

[0013] The end cover is mounted on the valve body, and the end cover is opposite to the permanent magnet.

[0014] One end of the adjusting handle is movably inserted into the end cover, and one end of the adjusting handle is connected to the permanent magnet.

[0015] Optionally, the electromagnet comprises a coil and a yoke, and the coil is embedded in the yoke.

[0016] Optionally, the electromagnet further includes a magnetic isolation sleeve, and the coil is wound on the magnetic isolation sleeve.

[0017] Optionally, the electromagnet installation cavity includes an inner cavity and an outer cavity, the outer cavity is arranged around the inner cavity, the electromagnet is arranged in the outer cavity, and the permanent magnet and the iron core are arranged in the inner cavity.

[0018] The electromagnet assembly also includes a magnetic isolation sheet,

[0019] The magnetic isolation sheet is installed in the inner cavity and is located between the permanent magnet and the return spring. The return spring is sandwiched between the magnetic isolation sheet and the iron core.

[0020] Optionally, the electromagnet assembly further comprises a guide sleeve, wherein the guide sleeve is arranged in the inner cavity, and the iron core is movably mounted in the guide sleeve.

[0021] Optionally, the valve core assembly further comprises a valve sleeve, wherein the valve sleeve is arranged in the valve core installation cavity, and the cylindrical end of the cone valve is movably inserted into the valve sleeve.

[0022] Optionally, the valve core assembly further includes a first sealing ring, and the first sealing ring is sleeved on the valve sleeve.

[0023] Optionally, the valve core assembly further includes a second sealing ring, wherein the second sealing ring is located between the iron core and the valve sleeve, and the cylindrical end of the cone valve is movably inserted into the second sealing ring.

[0024] Optionally, an oil circuit is further provided on the valve body, and two ends of the oil circuit are respectively connected to the valve core installation cavity, and a movement track of the cone valve in the valve core installation cavity is located between the two ends of the oil circuit.

[0025] Optionally, the solenoid valve further comprises a control circuit, wherein the control circuit comprises a pulse signal generator and an electromagnetic relay.

[0026] The electromagnetic relay includes an armature switch, and the armature switch includes a first armature and a second armature.

[0027] One end of the pulse signal generator is electrically connected to one end of the electromagnetic valve power supply, the other end of the pulse signal generator is electrically connected to one end of the first armature, and the other end of the electromagnetic valve power supply is electrically connected to one end of the second armature.

[0028] The other end of the first armature and the other end of the second armature can be disconnectably and alternately electrically connected to the two ends of the coil in the electromagnet.

[0029] The effects of the present invention are:

[0030] The electromagnet assembly includes an electromagnet, a permanent magnet, an iron core and a return spring, and the valve core assembly includes a cone valve. The electromagnet is arranged around the permanent magnet and the iron core, the permanent magnet and the iron core are coaxial, and the return spring is clamped between the permanent magnet and one end of the iron core. The permanent magnet has a magnetic attraction on the iron core, and the return spring has a spring elastic force on the iron core, and the magnetic attraction is opposite to the elastic force. The cylindrical end of the cone valve is connected to the other end of the iron core, and the iron core can drag the cone valve to move; the oil inlet is opposite to the conical end of the cone valve, and the cone valve and the iron core are subjected to the thrust of the hydraulic oil of the oil inlet, and the thrust is in the same direction as the magnetic attraction of the permanent magnet; the oil outlet is located on the moving track of the cone valve, and the movement of the cone valve will connect or disconnect the oil outlet with the oil inlet.

[0031] When the coil of the solenoid valve is not energized, the elastic force generated by the reset spring is greater than the sum of the magnetic attraction generated by the permanent magnet and the thrust of the hydraulic oil at the oil inlet, so the iron core pushes the cone valve, making the cone valve close to the oil outlet, and the solenoid valve is closed.

[0032] When the coil of the solenoid valve is energized in the forward direction, the magnetic field generated by the coil generates a suction force on the iron core in the same direction as the magnetic attraction of the permanent magnet and the thrust of the hydraulic oil. This is enough to overcome the elastic force of the spring, causing the iron core to compress the spring and move toward the permanent magnet, dragging the cone valve to open the oil outlet, and the solenoid valve gradually opens. After the solenoid valve is fully opened, the coil of the solenoid valve can be powered off. At this time, the permanent magnet is closest to the iron core, and the magnetic attraction generated by the permanent magnet is the largest. Together with the thrust of the hydraulic oil, the restoring force of the spring can be overcome, and the iron core can still compress the spring and continue to drag the cone valve to open the oil outlet. Therefore, the solenoid valve can remain in the open state even when the power is off.

[0033] When the coil of the solenoid valve is energized in the reverse direction, the magnetic field generated by the coil generates a suction force on the iron core in the same direction as the restoring force of the spring, and is greater than the sum of the magnetic attraction of the permanent magnet and the thrust of the hydraulic oil, so that the spring recovers its deformation and pushes the iron core and the cone valve toward the oil inlet, the cone valve is close to the oil outlet, and the solenoid valve gradually closes; after the solenoid valve is completely closed, the coil of the solenoid valve can be powered off. At this time, the permanent magnet is farthest from the iron core, the magnetic attraction generated by the permanent magnet is the smallest, the elastic force of the spring is greater than the sum of the magnetic attraction of the permanent magnet and the thrust of the hydraulic oil, the iron core can still continue to push the cone valve close to the oil outlet, so the solenoid valve can remain closed even when the power is off; in this way, the solenoid valve can maintain the open and closed states even when the power is off, realizing the self-holding function, the solenoid valve has low power consumption, and saves energy.

[0034] Furthermore, the adjustment handle is used to adjust the axial position of the permanent magnet, thereby controlling the distance between the permanent magnet and the iron core, thereby controlling the magnitude of the magnetic force between the two to adapt to hydraulic systems with different load sizes (solenoid valve opening pressure). BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of a solenoid valve provided by an embodiment of the present invention;

[0036] Figure 2 is a structural schematic diagram of a valve body provided by an embodiment of the present invention;

[0037] Figure 3 is a schematic structural diagram of an adjustment handle provided by an embodiment of the present invention;

[0038] Figure 4 is a structural schematic diagram of a cone valve and a valve sleeve provided in an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of a control circuit provided by an embodiment of the present invention;

[0040] Figure 6-Figure 8 is a state schematic diagram of an armature switch provided by an embodiment of the present invention;

[0041] Fig. 9 It is a schematic diagram of power supply provided by an embodiment of the present invention.

[0042] In the figure: 1, valve body, 11, electromagnet installation chamber, 12, valve core installation chamber, 121, oil inlet chamber, 122, pressure balance chamber, 13, oil inlet, 14, oil outlet, 15, oil circuit,

[0043] 2. End cap,

[0044] 3. Electromagnet assembly, 31. Electromagnet, 311. Coil, 312. Yoke, 313. Magnetic isolation sleeve, 32. Permanent magnet, 33. Iron core, 34. Return spring, 35. Magnetic isolation sheet, 36. Guide sleeve,

[0045] 4. Valve core assembly, 41. Cone valve, 42. Valve sleeve, 43. First sealing ring, 44. Second sealing ring,

[0046] 5. Adjustment handle, 51. External thread, 52. Connecting flange, 521. Threaded hole,

[0047] 6. Control circuit, 61. Electromagnetic relay, 611. Electromagnetic coil, 62. Armature switch, 621 、 First armature, 622 、 Second armature, 63, spring assembly, 631 、 First telescopic spring, 632 、 The second telescopic spring, 64, the electromagnetic relay power supply, 65, the capacitor, 66, the solenoid valve power supply, 67, the pulse signal generator, 68, the production system power supply. DETAILED DESCRIPTION

[0048] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] Figure 1 is a schematic diagram of the structure of a solenoid valve provided by an embodiment of the present invention, such as Figure 1 As shown, the solenoid valve includes a valve body 1, an electromagnet assembly 3 and a valve core assembly 4.

[0050] The electromagnet assembly 3 comprises an electromagnet 31 , a permanent magnet 32 ​​, an iron core 33 and a return spring 34 . The valve core assembly 4 comprises a cone valve 41 .

[0051] The valve body 1 is provided with an electromagnet installation cavity 11 and a valve core installation cavity 12 , and the electromagnet installation cavity 11 is coaxially communicated with the valve core installation cavity 12 .

[0052] The electromagnet assembly 3 is installed in the electromagnet installation cavity 11. The electromagnet 31 is arranged around the permanent magnet 32 ​​and the iron core 33. The permanent magnet 32 ​​and the iron core 33 are coaxial. The iron core 33 is movably arranged in the electromagnet 31. The return spring 34 is clamped between the permanent magnet 32 ​​and one end of the iron core 33.

[0053] The cone valve 41 is movably mounted in the valve core mounting cavity 12 , and the cylindrical end of the cone valve 41 is connected to the other end of the iron core 33 .

[0054] The valve body 1 is also provided with an oil inlet 13 and an oil outlet 14. The oil inlet 13 is coaxially connected to the valve core installation cavity 12. The oil inlet 13 is opposite to the conical end of the cone valve 41. The oil outlet 14 is connected to the valve core installation cavity 12. The oil outlet 14 is located on the moving trajectory of the cone valve 41 in the valve core installation cavity 12.

[0055] In an embodiment of the present invention, the electromagnet assembly includes an electromagnet, a permanent magnet, an iron core and a return spring, the valve core assembly includes a cone valve, the electromagnet is arranged around the permanent magnet and the iron core, the permanent magnet and the iron core are coaxial, the return spring is clamped between the permanent magnet and one end of the iron core, the permanent magnet has a magnetic attraction on the iron core, and the return spring has a spring elastic force on the iron core, and the magnetic attraction force is opposite to the elastic force; the cylindrical end of the cone valve is connected to the other end of the iron core, and the iron core can drag the cone valve to move; the oil inlet is opposite to the conical end of the cone valve, and the cone valve and the iron core are subjected to the thrust of the hydraulic oil of the oil inlet, and the thrust is in the same direction as the magnetic attraction of the permanent magnet; the oil outlet is located on the moving trajectory of the cone valve, and the movement of the cone valve will connect or disconnect the oil outlet with the oil inlet.

[0056] When the coil of the solenoid valve is not energized, the elastic force generated by the reset spring is greater than the sum of the magnetic attraction generated by the permanent magnet and the thrust of the hydraulic oil at the oil inlet, so the iron core pushes the cone valve, making the cone valve close to the oil outlet, and the solenoid valve is closed.

[0057] When the coil of the solenoid valve is energized in the forward direction, the magnetic field generated by the coil generates a suction force on the iron core in the same direction as the magnetic attraction of the permanent magnet and the thrust of the hydraulic oil. This is enough to overcome the elastic force of the spring, causing the iron core to compress the spring and move toward the permanent magnet, dragging the cone valve to open the oil outlet, and the solenoid valve gradually opens. After the solenoid valve is fully opened, the coil of the solenoid valve can be powered off. At this time, the permanent magnet is closest to the iron core, and the magnetic attraction generated by the permanent magnet is the largest. Together with the thrust of the hydraulic oil, the restoring force of the spring can be overcome, and the iron core can still compress the spring and continue to drag the cone valve to open the oil outlet. Therefore, the solenoid valve can remain in the open state even when the power is off.

[0058] When the coil of the solenoid valve is energized in the reverse direction, the magnetic field generated by the coil generates a suction force on the iron core in the same direction as the restoring force of the spring, and is greater than the sum of the magnetic attraction of the permanent magnet and the thrust of the hydraulic oil, so that the spring recovers its deformation and pushes the iron core and the cone valve toward the oil inlet, the cone valve is close to the oil outlet, and the solenoid valve gradually closes; after the solenoid valve is completely closed, the coil of the solenoid valve can be powered off. At this time, the permanent magnet is farthest from the iron core, the magnetic attraction generated by the permanent magnet is the smallest, the elastic force of the spring is greater than the sum of the magnetic attraction of the permanent magnet and the thrust of the hydraulic oil, the iron core can still continue to push the cone valve close to the oil outlet, so the solenoid valve can remain closed even when the power is off; in this way, the solenoid valve can maintain the open and closed states even when the power is off, realizing the self-holding function, the solenoid valve has low power consumption, and saves energy.

[0059] By means of the above mechanism, when the solenoid valve is in the initial state, under the action of the spring, the thrust generated by the spring is greater than the combined force of the magnetic force generated by the permanent magnet and the hydraulic force, so the iron core drives the valve core, making the cone valve close to the valve port, and the valve is sealed. Therefore, at this time, no oil flows out of the solenoid valve through the inlet, and it is in a tightly closed state.

[0060] Furthermore, when the solenoid valve needs to be opened, the coil is passed through a positive pulse current, and the force generated by the magnetic field of the coil on the iron core is in the same direction as the force generated by the magnetic field of the permanent magnet on the iron core. Therefore, the magnetic force generated at this time is sufficient to overcome the combined force of the spring force and the hydraulic force, causing the iron core to move to the left, while driving the valve core to move in the opening direction. The solenoid valve gradually opens and enters the open state. When the valve core moves to the far left and is fully opened, the power can be cut off. At this time, the suction force generated by the permanent magnet is still sufficient to overcome the combined force of the spring force and the hydraulic force, so the solenoid valve can remain in the open state. The oil is able to enter the outlet from the inlet, and the switch can still be opened after the power is cut off, realizing the self-holding function.

[0061] Furthermore, when the solenoid valve needs to be closed, the coil is passed through a reverse pulse current. The force generated by the magnetic field of the coil on the iron core is opposite to the force generated by the magnetic field of the permanent magnet on the iron core. Therefore, the magnetic force on the iron core is in the same direction as the spring force of the reset spring, both to the right. The combined force of the magnetic force and the spring force overcomes the hydraulic pressure, causing the iron core to move to the right, while driving the valve core to move in the closing direction. The solenoid valve gradually closes and finally closes completely. When the coil is powered off, due to the increase in the air gap between the permanent magnet and the iron core, the magnetic force is still not enough to overcome the combined force of the spring force and the hydraulic pressure, so the solenoid valve can always maintain the state before the power failure. The oil inlet and outlet cannot communicate, and can still be closed after power failure, realizing the self-holding function.

[0062] In the embodiment of the present invention, when the valve core needs to be in the original state position, that is, to remain open or closed, the permanent magnet provides magnetic attraction so that it can be maintained without external energy. No power is required in almost the entire control process, eliminating the safety hazards caused by the power supply; fundamentally solving the embarrassing situation of burning out due to long-term power supply of the electromagnet coil in the solenoid valve, long service life, and high reliability of driving the closing. In addition, the solenoid valve does not require power during operation, and its operation will not be affected by voltage fluctuations.

[0063] Figure 2 Schematic diagram of the structure of the valve body provided by the embodiment of the present invention. Figure 2 The electromagnet installation cavity 11 includes an inner cavity and an outer cavity, and the outer cavity is arranged around the inner cavity. Figure 1 , the electromagnet 31 is arranged in the outer cavity, and the permanent magnet 32 ​​and the iron core 33 are arranged in the inner cavity.

[0064] Exemplarily, the electromagnet assembly 3 may further include a magnetic isolation sheet 35 , which is installed in the inner cavity and located between the permanent magnet 32 ​​and the return spring 34 , and the return spring 34 is sandwiched between the magnetic isolation sheet 35 and the iron core 33 .

[0065] The function of the magnetic isolation plate 35 is to prevent the magnetic force generated by the permanent magnet 32 ​​from being too large to prevent the reset spring 34 from being unable to perform its reset function when the valve port is fully opened and the air gap between the permanent magnet 32 ​​and the iron core 33 is close to zero.

[0066] Accordingly, see Figure 2 A groove is provided on the inner wall of the inner cavity, and the magnetic isolation sheet 35 is installed in the groove.

[0067] For example, see Figure 1 The electromagnet 31 includes a coil 311 and a yoke 312 , and the coil 311 is embedded in the yoke 312 .

[0068] The yoke iron tightly wraps around the coil, wherein the yoke iron can be made of DT4 material, so that the magnetic leakage of the coil is reduced when power is turned on, thereby increasing the coil efficiency; the coil can be made of pure copper, so that the number of coil turns is reduced while meeting the design requirements, and the size of the solenoid valve becomes smaller.

[0069] In the embodiment of the present invention, the electromagnet 31 is arranged around the permanent magnet 32 ​​and the iron core 33, that is, the coil 311 and the permanent magnet are arranged in a circle, which can provide sufficient magnetic force to ensure that the solenoid valve can still operate stably in harsh environments.

[0070] For example, see Figure 1 The electromagnet 31 further includes a magnetic isolation sleeve 313 , and the coil 311 is wound on the magnetic isolation sleeve 313 .

[0071] The function of the magnetic isolation sleeve 313 is to effectively prevent magnetic leakage. ， Makes the electromagnet work more efficiently.

[0072] For example, see Figure 1 The electromagnet assembly 3 further includes a guide sleeve 36 , which is arranged in the inner cavity, and the iron core 33 is movably installed in the guide sleeve 36 .

[0073] The guide sleeve is used to fix the iron core and constrain the radial freedom of the iron core; at the same time, the guide sleeve can also reduce the friction when the iron core moves, so that the resistance overcome by the cone valve during movement is reduced, and its movement is smoother.

[0074] The iron core can be made of DT4 material, and can be fixed with the cone valve thread. A guide sleeve is provided on the outside to constrain its radial freedom, so that the iron core can stably move according to the design requirement trajectory when the coil is energized.

[0075] Exemplarily, the permanent magnet 32 ​​is movably arranged in the electromagnet 31. Figure 1 The solenoid valve further comprises an end cover 2 and an adjusting handle 5. The end cover 2 is mounted on the valve body 1, and the end cover 2 is opposite to the permanent magnet 32. One end of the adjusting handle 5 is movably inserted into the end cover 2, and one end of the adjusting handle 5 is connected to the permanent magnet 32.

[0076] Figure 3 is a schematic diagram of the structure of the adjustment handle provided by an embodiment of the present invention. Figure 3 , the adjusting handle 5 is provided with an external thread 51, and correspondingly, the end cover 2 is provided with a mounting hole, and the mounting hole is provided with an internal thread. The external thread 51 on the adjusting handle 5 matches with the internal thread of the mounting hole, that is, the adjusting handle 2 and the end cover 2 can be threadedly matched. When the adjusting handle 5 is rotated, the permanent magnet 32 ​​can be driven to move horizontally in the valve body. A connecting flange 52 is provided at one end of the adjusting handle 5, and a threaded hole 521 is provided on the connecting flange 52. The threaded hole 521 is used for screw connection with the permanent magnet 32. The threaded matching and screw connection can realize the rapid installation and disassembly of the adjusting handle 5, and improve the installation efficiency of the solenoid valve.

[0077] The adjustment handle 5 is used to adjust the axial position of the permanent magnet 32, and then control the distance between the permanent magnet 32 ​​and the iron core 33, so as to control the magnitude of the magnetic force between the two, so as to adapt to hydraulic systems with different load sizes (solenoid valve opening pressure). When the present invention is applied to a hydraulic system with a large load, the cone valve is subjected to a large opening resistance, and the adjustment handle can be rotated clockwise, and the adjustment handle will move the permanent magnet connected thereto to the right, then the magnetic force between the permanent magnet and the iron core will increase, and the thrust of the cone valve connected to the iron core will also increase, thereby overcoming the resistance of the large-load hydraulic system and allowing the valve port to open and close smoothly; on the contrary, in a small-load system, the cone valve is subjected to a small opening resistance, and the adjustment handle is rotated counterclockwise, the permanent magnet will move to the left, and the thrust of the cone valve will also decrease accordingly, and the cone valve can also be opened and closed smoothly.

[0078] When the cone valve 41 controls the opening and closing of the oil inlet and outlet, there is no gap between the sealing surfaces (between the conical surface of the conical end of the cone valve 41 and the oil outlet), so that the circuit is completely opened and closed to prevent oil leakage. For example, the cone angle of the conical end of the cone valve 41 can be 60 degrees.

[0079] For example, see Figure 1 The valve core assembly 4 further includes a valve sleeve 42, which is arranged in the valve core installation cavity 12. Figure 4 Schematic diagram of the structure of the cone valve and valve sleeve provided by the embodiment of the present invention. Figure 4 The cylindrical end of the cone valve 41 is movably inserted into the valve sleeve 42.

[0080] The cone valve 41 is installed in the valve sleeve 42 and can move axially. The valve sleeve 42 plays a role of movement guidance and protection.

[0081] For example, see Figure 1 The valve core assembly 4 also includes a first sealing ring 43 , and the first sealing ring 43 is sleeved on the valve sleeve 42 .

[0082] The first sealing ring 43 is used to prevent the hydraulic oil entering the oil inlet from leaking into the electromagnet installation cavity 11 .

[0083] For example, see Figure 1 and Figure 4 The valve core assembly 4 further includes a second sealing ring 44 , which is located between the iron core 33 and the valve sleeve 42 , and the cylindrical end of the cone valve 41 is movably inserted into the second sealing ring 44 .

[0084] The second sealing ring 44 is used to prevent the hydraulic oil in the valve core installation cavity 12 from leaking into the electromagnet installation cavity 11 .

[0085] The combined use of the first sealing ring 43 and the second sealing ring 44 can strengthen the separation between the electromagnet installation chamber 11 and the valve core installation chamber 12 , thereby preventing the hydraulic oil in the valve core installation chamber 12 from leaking into the electromagnet installation chamber 11 .

[0086] Exemplarily, an oil circuit 15 is further provided on the valve body 1 , and two ends of the oil circuit 15 are respectively connected to the valve core installation cavity 12 , and a moving track of the cone valve 41 in the valve core installation cavity 12 is located between the two ends of the oil circuit 15 .

[0087] The cone valve 41 divides the valve core installation chamber 12 into an oil inlet chamber 121 and a pressure balance chamber 122. The pressure balance chamber 122 is located between the cone valve 41 and the valve sleeve 42. The oil inlet chamber 121 is located at the conical end of the cone valve 41. The oil inlet port 13 is arranged in the oil inlet chamber 121. The oil passage added to the valve body allows the oil in the oil inlet chamber to enter the pressure balance chamber, thereby reducing the hydraulic unbalanced force when the solenoid valve is opened. At the same time, the hydraulic unbalanced force can also be directed to the closing direction of the valve core when the solenoid valve is fully closed, thereby reducing the burden on the electromagnetic device and making the solenoid valve more energy-efficient.

[0088] Optionally, the oil inlet and outlet parts can be connected to the hydraulic circuit connector via threads, which can ensure stable flow of the hydraulic circuit.

[0089] For example, see Figure 1 , the solenoid valve also includes a control circuit 6. Figure 5 is a schematic diagram of a control circuit provided by an embodiment of the present invention, see Figure 5 The control circuit 6 includes a pulse signal generator 67 and an electromagnetic relay 61. The electromagnetic relay 61 includes an armature switch 62, and the armature switch 62 includes a first armature 621 and a second armature 622.

[0090] One end of the pulse signal generator 67 is electrically connected to one end of the electromagnetic valve power supply 66, the other end of the pulse signal generator 67 is electrically connected to one end of the first armature 621, and the other end of the electromagnetic valve power supply 66 is electrically connected to one end of the second armature 622. The other end of the first armature 621 and the other end of the second armature 622 can be disconnected and alternately electrically connected to the two ends of the coil 311 in the electromagnet 31.

[0091] The opening and closing of the solenoid valve is achieved by controlling the armature switch 62, specifically, by controlling the other ends of the first armature 621 and the second armature 622 to be connected or disconnected with the two ends of the coil 311. The detailed control process is as follows.

[0092] The initial state of the solenoid valve is set to be powered off and closed. At this time, the other end of the first armature and the other end of the second armature are both disconnected from the two ends of the coil 311 in the electromagnet 31. When the solenoid valve is opened, the other end of the first armature is controlled to be connected to one end of the coil 311 in the electromagnet 31 and the other end of the second armature is connected to the other end of the coil 311 in the electromagnet 31, so that the coil 311 is energized in the forward direction and the solenoid valve is opened. After the solenoid valve is fully opened, the other end of the first armature and the other end of the second armature are controlled to be disconnected from the two ends of the coil 311 in the electromagnet 31, so that the solenoid valve is powered off and maintained in the open state (the principle of maintaining this state is as described above). When the solenoid valve is closed, the other end of the first armature is controlled to be connected to the other end of the coil 311 in the electromagnet 31 and the other end of the second armature is connected to one end of the coil 311 in the electromagnet 31, so that the coil 311 is energized in the reverse direction and the solenoid valve is closed. After the solenoid valve is completely closed, the other end of the first armature and the other end of the second armature are controlled to be disconnected from the two ends of the coil 311 in the electromagnet 31, so that the solenoid valve is powered off and maintains a closed state (the principle of maintaining this state is as described above).

[0093] From the moment the solenoid valve is energized to the moment the solenoid valve is fully opened or fully closed, When the hydraulic oil circuit is determined, The specific time value can be obtained through testing to determine whether the solenoid valve is fully open or fully closed.

[0094] The embodiment of the present invention does not limit the control method of the armature switch, and the armature switch can be manually controlled or controlled in other non-manual ways.

[0095] Figure 6-Figure 8 is a schematic diagram of the state of the armature switch provided by an embodiment of the present invention. Figure 5-8The electromagnetic relay 61 may further include an electromagnetic coil 611 and a spring assembly 63. The spring assembly 63 includes a first telescopic spring 631 and a second telescopic spring 632. One end of the first telescopic spring 631 is connected to the first armature 621, one end of the second telescopic spring 632 is connected to the second armature 622, and the other ends of the first telescopic spring 631 and the second telescopic spring 632 are both fixedly installed. The electromagnetic coil 611 is arranged around the first armature 621 and the second armature 622. When the electromagnetic coil 611 is energized, the magnetic field generated by the electromagnetic coil 611 has a suction force on the first armature 621 and the second armature 622 that is greater than the spring force generated by the spring assembly 63.

[0096] The telescopic spring exerts a spring pulling force on the armature switch, and the electromagnetic coil is powered by the electromagnetic relay power supply. When the electromagnetic relay power supply is not cut off, the electromagnetic coil can exert a continuous magnetic attraction force on the armature switch, and the magnetic attraction force is greater than the spring pulling force, so that the armature switch is in a disconnected state without external intervention, so that no current flows inside the electromagnetic coil.

[0097] Illustratively, the armature switch may be a manually actuated switch. Figure 6-Figure 8 is a schematic diagram of the state of the armature switch provided by an embodiment of the present invention. Figure 6 When the armature switch is in normal state (not manually driven), the first armature and the second armature are respectively attracted by the magnetic field generated by the electromagnetic coil, the first telescopic spring and the second telescopic spring are stretched, and the other end of the first armature and the other end of the second armature are disconnected from the two ends of the coil 311. At this time, the electromagnetic valve is powered off. Figure 7 When the armature switch is manually driven to the first state, the other end of the first armature is electrically connected to one end of the coil 311 and the other end of the second armature is electrically connected to the other end of the coil 311. The first telescopic spring and the second telescopic spring are both in a compressed state (the manual driving force is greater than the combined force of the restoring force of the telescopic spring and the electromagnetic field attraction). At this time, the solenoid valve is energized in the forward direction. Figure 8 When the armature switch is manually driven to the second state, the other end of the first armature is electrically connected to the other end of the coil 311 and the second armature is electrically connected to one end of the coil 311. The first telescopic spring and the second telescopic spring are both in normal state (the manual driving force is greater than the electromagnetic field attraction force). At this time, the solenoid valve is reversely energized. When it is determined that the solenoid valve is fully opened or fully closed (for example, a driving force can be manually applied for a specified time), the manual driving force applied to the armature switch is canceled, and the armature switch will become normal (the armature is attracted by the electromagnetic field). Figure 6 As shown, the solenoid valve is powered off and maintains an open or closed state.

[0098] In general, if Figure 7 and Figure 8As shown, the internal armature switch in the control circuit needs to be energized in the forward and reverse directions under manual intervention. The armature switches here are all point-controlled switches, that is, after manual adjustment of the forward and reverse directions, when the manual intervention is withdrawn, the armature switch will return to the power-off position under the action of the electromagnetic coil. At this time, no current flows inside the solenoid valve.

[0099] like Figure 7 As shown, when the solenoid valve power supply is not cut off, in order to open the solenoid valve core, a positive current needs to be passed. By placing the armature switch inside the control circuit in this position, a positive current can be passed to the solenoid valve coil. At this time, the telescopic spring in the control circuit is in a compressed state. Furthermore, a positive current passes through the coil inside the solenoid valve, and the force generated by the magnetic field generated by the coil on the iron core is in the same direction as the force generated by the magnetic field generated by the permanent magnet on the iron core. Therefore, the magnetic force generated at this time is sufficient to overcome the combined force of the spring force and the hydraulic force, causing the iron core to move to the left, while driving the valve core to move in the opening direction, and the solenoid valve gradually opens and enters the open state.

[0100] like Figure 8 As shown, in order to close the solenoid valve core when the solenoid valve power supply is not cut off, a reverse current needs to be passed. By placing the switch inside the control circuit in this position, a reverse current can be passed through the solenoid valve coil, and the spring in the control circuit is in place. Furthermore, when a reverse current passes through the internal coil of the solenoid valve, the force generated by the magnetic field generated by the coil on the iron core is opposite to the force generated by the magnetic field generated by the permanent magnet on the iron core. Therefore, the magnetic force on the iron core is in the same direction as the spring force of the reset spring, both to the right. The combined force of the magnetic force and the spring force overcomes the hydraulic pressure, causing the iron core to move to the right, while driving the valve core to move in the closing direction. The solenoid valve gradually closes and is finally completely closed.

[0101] In the embodiment of the present invention, an electromagnetic relay is used in the control circuit to control the forward and reverse power on and off of the coil 311 in the electromagnet 31, so that the control circuit is simple, efficient, and easy to maintain. It should be noted that the structure of the above-mentioned electromagnetic relay is only an example, and the embodiment of the present invention does not limit the specific structure of the electromagnetic relay, and electromagnetic relays of other structures can also be used to realize the forward and reverse power on and off of the coil 311 in the electromagnet 31.

[0102] The pulse signal generator can convert the solenoid valve power supply current into a pulse signal, which is finally transmitted to the solenoid valve and plays a timing role, and can accurately control the movement stroke of the solenoid valve cone valve. The pulse signal generator can use the PT8A2513NE chip, which has the function of pulse signal conversion and timing. It can convert the solenoid valve power supply current into a pulse signal and set the output pulse signal time. In this way, even if the armature switch does not become normal, the pulse signal is closed at a fixed time, and the solenoid valve is controlled to be powered off, which can further reduce energy consumption.

[0103] Since the solenoid valve is usually in working state for a long time, once the whole production system is powered off, the hydraulic system cannot work. In order to protect the production equipment, the solenoid valve port needs to be in a closed state when the power is off, so the power off protection in the hydraulic system is very important. Based on this, the control circuit also includes a capacitor 65, such as Figure 5 As shown, the capacitor 65 is connected in parallel with the electromagnetic valve power supply 66. Accordingly, when the electromagnetic valve power supply 66 and the electromagnetic relay 61 are powered off, the other end of the first armature 621 and the other end of the second armature 622 are electrically connected to the designated end of the coil 311, so that the capacitor 65 discharges to the coil 311, so that the cone valve 41 closes the oil outlet 14.

[0104] When the solenoid valve power supply is supplied, the capacitor is fully charged and both ends of the capacitor are in an open circuit state; when the production system power supply is in a power-off state, that is, the solenoid valve power supply is cut off, the capacitor is in a discharged state and can supply power to the solenoid valve for a short time. Fig. 9 Schematic diagram of power supply provided by an embodiment of the present invention. Fig. 9 , the solenoid valve power supply 66 and the electromagnetic relay power supply 64 are connected in parallel in the circuit, and both are powered by the production system power supply 68. The electromagnetic relay power supply 64 only supplies power to the electromagnetic coil 611 of the electromagnetic relay 61. When the factory is powered off, the production system power supply 68 is powered off, and then the solenoid valve power supply 64 and the electromagnetic relay power supply 66 are both powered off. Under normal circumstances, in industrial production, the production system power supply will not be powered off. Once an unexpected power outage occurs, Figure 8 As shown, since the relay power supply is not powered, the magnetic attraction of the electromagnetic coil to the armature switch is zero at this time. No matter what state the armature switch is in at this time, the elastic force of the first telescopic spring and the second telescopic spring will make the armature switch in the reverse power-on state, that is, the first telescopic spring and the second telescopic spring are in the original position. Furthermore, the capacitor will discharge for a short time due to the power failure of the electromagnetic valve power supply, and supply power to the electromagnetic valve for a short time. At this time, the electromagnetic valve coil is in the reverse power-on state, which will close the valve port of the electromagnetic valve and protect the entire hydraulic system.

[0105] The solenoid valve provided in the embodiment of the present invention can achieve a valve position holding state under low power consumption, and has stable operation and long service life. At the same time, the magnetic force between the permanent magnet and the iron core can be controlled by mechanical adjustment, adapting to hydraulic systems with different opening pressures, and realizing the function of power-off self-protection.

[0106] The above embodiments are merely exemplary, and those skilled in the art should understand that the method and system described in the present invention are not limited to the embodiments described in the specific embodiments. After considering the technical solution of the present invention, those skilled in the art will easily think of other embodiments, which also belong to the technical innovation scope of the present invention, and the protection scope of the present invention is indicated by the claims.

Claims

1. A solenoid valve, comprising a valve body (1), an electromagnet assembly (3) and a valve core assembly (4), wherein the electromagnet assembly (3) comprises an electromagnet (31), an iron core (33), and a return spring (34), and the valve core assembly (4) comprises a cone valve (41) ， Characterized in that the electromagnet assembly (3) further comprises a permanent magnet (32) ， The valve body (1) is provided with an electromagnet installation cavity (11) and a valve core installation cavity (12), and the electromagnet installation cavity (11) is coaxially connected with the valve core installation cavity (12). The electromagnet assembly (3) is installed in the electromagnet installation cavity (11), the electromagnet (31) is arranged around the permanent magnet (32) and the iron core (33), the permanent magnet (32) and the iron core (33) are coaxial, the iron core (33) is movably arranged in the electromagnet (31), and the return spring (34) is sandwiched between the permanent magnet (32) and one end of the iron core (33). The cone valve (41) is movably mounted in the valve core mounting cavity (12), and the cylindrical end of the cone valve (41) is connected to the other end of the iron core (33). The valve body (1) is also provided with an oil inlet (13) and an oil outlet (14); the oil inlet (13) is coaxially connected to the valve core installation cavity (12); the oil inlet (13) is opposite to the conical end of the cone valve (41); the oil outlet (14) is connected to the valve core installation cavity (12); the oil outlet (14) is located on the moving track of the cone valve (41) in the valve core installation cavity (12); The permanent magnet (32) is movably arranged in the electromagnet (31), and the solenoid valve further comprises an end cover (2) and an adjustment handle (5). The end cover (2) is mounted on the valve body (1), and the end cover (2) is opposite to the permanent magnet (32). One end of the adjustment handle (5) is movably inserted into the end cover (2), and one end of the adjustment handle (5) is connected to the permanent magnet (32).

2. The solenoid valve according to claim 1, characterized in that: The electromagnet (31) comprises a coil (311) and a yoke (312), wherein the coil (311) is embedded in Said Inside the yoke (312).

3. The solenoid valve according to claim 2, characterized in that: The electromagnet (31) further comprises a magnetic isolation sleeve (313), and the coil (311) is wound on the magnetic isolation sleeve (313).

4. The solenoid valve according to claim 1, characterized in that: The electromagnet installation cavity (11) comprises an inner cavity and an outer cavity, the outer cavity is arranged around the inner cavity, the electromagnet (31) is arranged in the outer cavity, and the permanent magnet (32) and the iron core (33) are arranged in the inner cavity. The electromagnet assembly (3) further comprises a magnetic isolation sheet (35), The magnetic isolation sheet (35) is installed in the inner cavity and is located between the permanent magnet (32) and the return spring (34); the return spring (34) is sandwiched between the magnetic isolation sheet (35) and the iron core (33).

5. The solenoid valve according to claim 4, characterized in that: The electromagnet assembly (3) further comprises a guide sleeve (36), wherein the guide sleeve (36) is arranged in the inner cavity, and the iron core (33) is movably mounted in the guide sleeve (36).

6. The solenoid valve according to claim 1, characterized in that: The valve core assembly (4) further comprises a valve sleeve (42), wherein the valve sleeve (42) is arranged in the valve core installation cavity (12), and the cylindrical end of the cone valve (41) is movably inserted into the valve sleeve (42).

7. According to the claim 6 The solenoid valve is characterized in that: The valve core assembly (4) further comprises a first sealing ring (43), wherein the first sealing ring (43) is sleeved on the valve core assembly (4). Said On the valve sleeve (42).

8. According to the claim 6 The solenoid valve is characterized in that: The valve core assembly (4) further comprises a second sealing ring (44), wherein the second sealing ring (44) is located between the iron core (33) and the valve sleeve (42), and the cylindrical end of the cone valve (41) is movably inserted into the second sealing ring (44).

9. The solenoid valve according to any one of claims 1 to 8, characterized in that: The valve body (1) is also provided with an oil circuit (15), the two ends of which are respectively connected to the valve core installation cavity (12), and the movement track of the cone valve (41) in the valve core installation cavity (12) is located between the two ends of the oil circuit (15).

10. The solenoid valve according to any one of claims 1 to 8, characterized in that: The solenoid valve further comprises a control circuit (6), wherein the control circuit (6) comprises a pulse signal generator (67) and an electromagnetic relay (61). The electromagnetic relay (61) comprises an armature switch (62), wherein the armature switch (62) comprises a first armature (621) and a second armature (622). One end of the pulse signal generator (67) is electrically connected to one end of the electromagnetic valve power supply (66), the other end of the pulse signal generator (67) is electrically connected to one end of the first armature (621), and the other end of the electromagnetic valve power supply (66) is electrically connected to one end of the second armature (622). The other end of the first armature (621) and the other end of the second armature (622) are both disconnectably electrically connected to the two ends of the coil (311) in the electromagnet (31) in alternating fashion.

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