An internally balanced solenoid valve

Abstract

The present invention discloses an internally balanced solenoid valve, which belongs to the field of solenoid valves, comprising a valve body, wherein an inlet flow channel, an outlet flow channel and a pressure chamber are provided in the valve body, a sealing hole connected to the outlet flow channel is provided on the bottom surface of the pressure chamber, and a guide hole connected to the inlet flow channel is provided on the side of the pressure chamber; a main valve seat, a secondary valve assembly, a spring assembly, an electromagnetic drive assembly and a reset spring are also provided in the valve body; the main valve seat is arranged in the pressure chamber; one end of the secondary valve assembly is arranged in a receiving groove, and the other end is connected to the electromagnetic drive assembly, and a block is provided on the side wall of the receiving groove, which is arranged on the side of the secondary valve assembly away from the bottom plate, and is limited to the secondary valve assembly along the axial direction of the sealing hole; the spring assembly is arranged between the secondary valve assembly and the bottom plate, and the reset spring is used to provide an elastic force for the secondary valve assembly, thereby reducing the power consumption of the solenoid valve.

Description

Technical Field

[0001] The invention belongs to the technical field of solenoid valves, and in particular relates to an internally balanced solenoid valve. Background Art

[0002] A solenoid valve is a switching device controlled by electromagnetic principles. It offers advantages such as quick response, low power consumption, compact structure, high reliability, high safety, wide application range, easy integration, and low price. Solenoid valves are often used to control the flow of oil in fuel systems of aerospace equipment.

[0003] A common solenoid valve includes a valve body, which is equipped with an electromagnetic drive assembly, a piston and a spring. The electromagnetic drive assembly includes a coil, a fixed iron core and a moving iron core. The fixed iron core and the moving iron core are arranged opposite to each other. The spring provides elastic force for the moving iron core. The piston and the moving iron core are connected. The valve body is also equipped with an inlet channel, an outlet channel and a connecting channel. One end of the connecting channel is connected to the inlet channel, and the other end is connected to the outlet channel.

[0004] With this structure, when the coil is energized, the moving iron core, under the influence of the coil's magnetic field, drives the piston to seal the connecting channel, disconnecting the inlet and outlet channels and preventing oil from flowing through the valve body. When the coil is de-energized, the moving iron core and piston, under the elastic action of the spring, open the connecting channel, connecting the inlet and outlet channels, allowing oil to flow through the valve body, thus enabling the solenoid valve to control the flow of oil. However, when the solenoid valve is used in large-diameter working conditions, the electromagnetic force required for sealing the solenoid valve is relatively large, resulting in high power consumption. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an internally balanced solenoid valve. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] In the first aspect, the present invention provides an internally balanced solenoid valve, comprising a valve body, an inlet flow channel, an outlet flow channel and a pressure chamber provided in the valve body, a sealing hole connected to the outlet flow channel provided on the bottom surface of the pressure chamber, and a guide hole connected to the inlet flow channel provided on the side surface of the pressure chamber; a main valve seat, a sub-valve assembly, a spring assembly, an electromagnetic drive assembly and a reset spring are also provided in the valve body; the main valve seat is arranged in the pressure chamber, the main valve seat comprises a bottom plate and a surrounding plate, the bottom plate and the surrounding plate correspond to the sealing hole, the bottom plate and the surrounding plate are connected and form a receiving groove with an opening direction away from the sealing hole, the surrounding plate is provided with a through hole for connecting to the guide hole, and a through hole is provided along the axis of the sealing hole. The projected area of ​​the sealing hole is smaller than the projected area of ​​the bottom plate; one end of the auxiliary valve assembly is arranged in the accommodating groove, and the other end is connected to the electromagnetic drive assembly. A stopper is provided on the side wall of the accommodating groove, and the stopper is arranged on the side of the auxiliary valve assembly away from the bottom plate, and is limited along the axial direction of the sealing hole and the auxiliary valve assembly; the electromagnetic drive assembly is used to drive the auxiliary valve assembly to move, and when the auxiliary valve assembly moves, the main valve seat is driven to move away from the sealing hole through the stopper; the spring assembly is arranged between the auxiliary valve assembly and the bottom plate, and the reset spring is used to provide an elastic force for the auxiliary valve assembly, so that the auxiliary valve assembly presses the bottom plate of the main valve seat against the bottom surface of the pressure chamber through the spring assembly.

[0007] In one embodiment of the present invention, the auxiliary valve assembly includes an auxiliary valve seat and a sleeve; one end of the sleeve is arranged in the accommodating groove, and the other end is connected to the electromagnetic drive assembly, and a limit plate is provided on the outer wall of the sleeve, and the limit plate is limited and matched with the blocker along the axial direction of the sealing hole; the auxiliary valve seat is sleeved in the sleeve, and the auxiliary valve seat and the sleeve are limited and matched along the axial direction of the sleeve and in the direction away from the sealing hole; the spring assembly includes a first spring and a second spring, the first spring is arranged between the auxiliary valve seat and the bottom plate of the main valve seat, and the second spring is arranged between the sleeve and the bottom plate of the main valve seat.

[0008] In one embodiment of the present invention, the sleeve includes a first cylinder section, a connecting section and a second cylinder section connected in sequence, the diameter of the first cylinder section is smaller than the diameter of the second cylinder section; the auxiliary valve seat is arranged in the second cylinder section and abuts against the connecting section under the action of the first spring.

[0009] In one embodiment of the present invention, a first sealing ring is provided between the auxiliary valve seat and the connecting section.

[0010] In one embodiment of the present invention, a diaphragm and a pressure block are provided in the pressure chamber, the diaphragm divides the pressure chamber into an upper chamber and a lower chamber, the main valve seat is arranged in the lower chamber, the pressure block is connected to the sleeve, and the diaphragm is pressed between the pressure block and the sleeve; the valve body also includes an external flow channel, one end of the external flow channel is connected to the outlet flow channel, and the other end of the external flow channel is connected to the upper chamber.

[0011] In one embodiment of the present invention, a guide groove is provided on the first barrel section, and the interior of the first barrel section is communicated with the upper chamber through the guide groove.

[0012] In one embodiment of the present invention, a gap exists between the sleeve and the surrounding plate of the main valve seat.

[0013] In one embodiment of the present invention, the electromagnetic drive assembly includes a coil, a fixed iron core and a moving iron core. The moving iron core and the sleeve are threadedly connected, and a reset spring is arranged between the fixed iron core and the moving iron core. When the coil is energized, the moving iron core is driven to move, and when the moving iron core moves, the sleeve is driven to move.

[0014] In one embodiment of the present invention, a second sealing ring is provided between the bottom plate and the bottom surface of the pressure chamber.

[0015] In one embodiment of the present invention, the enclosure plate is an annular enclosure plate, and a plurality of through-holes are provided on the annular enclosure plate, and the plurality of through-holes are evenly distributed along the circumference of the annular enclosure plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the above-mentioned solution of the present application, the internally balanced solenoid valve includes a valve body, which is provided with an inlet flow channel, an outlet flow channel, and a pressure chamber. The bottom surface of the pressure chamber is provided with a sealing hole connected to the outlet flow channel, and the side surface of the pressure chamber is provided with a guide hole connected to the inlet flow channel. The valve body also includes a main valve seat, a secondary valve assembly, a spring assembly, an electromagnetic drive assembly, and a return spring. With this structure, when the electromagnetic drive assembly is energized, the electromagnetic drive assembly can drive the secondary valve assembly to move. When the secondary valve assembly moves, it drives the main valve seat away from the sealing hole through the stopper, so that the bottom plate of the main valve seat can be separated from the bottom surface of the pressure chamber, thereby allowing oil to flow from the inlet flow channel to the outlet flow channel, and the solenoid valve is in an open state. When the electromagnetic drive assembly is de-energized, the return spring provides an elastic force to the secondary valve assembly, so that the secondary valve assembly presses the bottom plate of the main valve seat against the bottom surface of the pressure chamber through the spring assembly, so that the main valve seat can seal the sealing hole, the inlet flow channel and the outlet flow channel can be disconnected, and the solenoid valve is in a closed state. Therefore, when the solenoid valve described above is used, the flow of oil can be controlled by the solenoid valve.

[0018] In addition, firstly, when the solenoid valve in this application is in a closed state, the main valve seat is pressed against the bottom surface of the pressure chamber by the action of the return spring, the auxiliary valve assembly and the spring assembly to achieve sealing; when the solenoid valve needs to be opened, the electromagnetic drive assembly is first energized, and then the movement of the main valve seat is controlled by the auxiliary valve assembly to open the flow channel. Therefore, the electromagnetic drive assembly does not need to be energized for a long time to control the main valve seat to seal the sealing hole so that the solenoid valve remains in a closed state, thereby reducing the power consumption of the solenoid valve. Secondly, when the solenoid valve is used in a large-diameter working condition or an oil environment with a high working pressure, the oil can first flow into the receiving groove of the main valve seat to apply pressure to the main valve seat and the auxiliary valve seat, so that the oil can participate in the sealing and starting process of the solenoid valve, thereby reducing the electromagnetic force required for the solenoid valve to work and reducing the power consumption of the solenoid valve.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of an internally balanced solenoid valve provided by an embodiment of the present invention. Figure 1 ;

[0021] Figure 2 yes Figure 1 An enlarged schematic diagram at point A;

[0022] Figure 3 This is a schematic diagram of an internally balanced solenoid valve provided by an embodiment of the present invention. Figure 2 ;

[0023] Figure 4 yes Figure 3 An enlarged schematic diagram at B;

[0024] Figure 5 This is a schematic diagram of an internally balanced solenoid valve provided by an embodiment of the present invention. Figure 3 ;

[0025] Figure 6 yes Figure 5 Enlarged schematic diagram at C.

[0026] Figure markings: 1-valve body, 11-inlet flow channel, 12-outlet flow channel, 13-pressure chamber, 131-sealing hole, 132-guide hole, 2-main valve seat, 3-auxiliary valve assembly, 31-auxiliary valve seat, 32-sleeve, 4-stopper, 5-electromagnetic drive assembly, 51-coil, 52-fixed iron core, 53-moving iron core, 6-first spring, 7-second spring, 8-diaphragm, 9-external flow channel, 10-reset spring. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0028] Generally, a solenoid valve is a switching device controlled by electromagnetic principles. It offers advantages such as quick response, low power consumption, compact structure, high reliability, high safety, wide application range, easy integration, and low price. In the fuel systems of aerospace equipment, solenoid valves are required to control the flow of oil.

[0029] A common solenoid valve includes a valve body, which is equipped with an electromagnetic drive assembly, a piston, and a spring. The electromagnetic drive assembly includes a coil, a fixed iron core, and a movable iron core. The fixed iron core and movable iron core are arranged relative to each other, and the spring provides elastic force for the movable iron core. The piston and movable iron core are connected. The valve body also includes an inlet flow channel, an outlet flow channel, and a connecting flow channel. One end of the connecting flow channel is connected to the inlet flow channel, and the other end is connected to the outlet flow channel. With this structure, when the coil is energized, the movable iron core, under the action of the coil's magnetic field, drives the piston to move and seal the connecting flow channel, thereby disconnecting the inlet and outlet flow channels and preventing oil from flowing out of the valve body. When the coil is de-energized, the movable iron core and piston, under the elastic action of the spring, open the connecting flow channel, connecting the inlet and outlet flow channels, thereby allowing oil to flow out of the valve body, thereby enabling the solenoid valve to control the on and off of oil. However, when the solenoid valve is used in large-diameter working conditions, the electromagnetic force required for sealing the solenoid valve is relatively large, resulting in high power consumption of the solenoid valve.

[0030] Another common solenoid valve includes a valve body, which is equipped with an electromagnetic drive assembly and a piston. The electromagnetic drive assembly includes a coil, a fixed iron core, and a movable iron core. A spring is provided between the fixed iron core and the movable iron core. The piston and the movable iron core are connected. The valve body also includes an inlet channel, an outlet channel, and a connecting channel. One end of the connecting channel is connected to the inlet channel, and the other end is connected to the outlet channel. With this structure, the movable iron core and the piston can seal the connecting channel under the elastic action of the spring, so that the inlet channel and the outlet channel are disconnected, preventing the oil from flowing out of the valve body. Alternatively, when the coil is energized, the movable iron core drives the piston to move to open the connecting channel under the action of the coil's magnetic field, so that the inlet channel and the outlet channel are connected, allowing the oil to flow out of the valve body. Among them, when the solenoid valve is used in an oil environment with a high pressure difference, the solenoid valve needs to use a large-sized, high-rigidity spring so that the spring can provide sufficient elastic force for the piston to ensure that the piston can seal the connecting channel. Therefore, when the solenoid valve is powered on, a high current must flow through the coil to enhance the magnetic effect of the moving iron core, allowing it to overcome the spring force and drive the piston to open the connecting flow channel, ensuring that the solenoid valve can control the flow of oil. However, when using this structure, the high current flowing through the solenoid valve increases the power consumption of the solenoid valve.

[0031] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6, an embodiment of the present invention provides an internally balanced solenoid valve, comprising a valve body 1, wherein an inlet flow channel 11, an outlet flow channel 12 and a pressure chamber 13 are provided in the valve body 1, a sealing hole 131 communicating with the outlet flow channel 12 is provided on the bottom surface of the pressure chamber 13, and a guide hole 132 communicating with the inlet flow channel 11 is provided on the side surface of the pressure chamber 13; a main valve seat 2, a sub-valve assembly 3, a spring assembly, an electromagnetic drive assembly 5 and a reset spring 10 are also provided in the valve body 1; the main valve seat 2 is arranged in the pressure chamber 13, the main valve seat 2 comprises a bottom plate and a surrounding plate, the bottom plate and the sealing hole 131 correspond to each other, the bottom plate and the surrounding plate are connected and enclose a receiving groove with an opening direction away from the sealing hole 131, the surrounding plate is provided with a through hole for communicating with the guide hole 132, and a through hole is provided along the sealing hole In the axial direction of 131, the projected area of ​​the sealing hole 131 is smaller than the projected area of ​​the bottom plate; one end of the auxiliary valve assembly 3 is arranged in the accommodating groove, and the other end is connected to the electromagnetic drive assembly 5. A stopper 4 is provided on the side wall of the accommodating groove. The stopper 4 is arranged on the side of the auxiliary valve assembly 3 away from the bottom plate, and is limited along the axial direction of the sealing hole 131 and the auxiliary valve assembly 3; the electromagnetic drive assembly 5 is used to drive the auxiliary valve assembly 3 to move, and when the auxiliary valve assembly 3 moves, it drives the main valve seat 2 to move away from the sealing hole 131 through the stopper 4; the spring assembly is arranged between the auxiliary valve assembly 3 and the bottom plate, and the reset spring 10 is used to provide an elastic force for the auxiliary valve assembly 3, so that the auxiliary valve assembly 3 presses the bottom plate of the main valve seat 2 against the bottom surface of the pressure chamber 13 through the spring assembly.

[0032] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the valve body 1 includes an upper shell and a lower shell, which are fastened together by bolts. The electromagnetic drive assembly 5 is disposed within the upper shell, which is provided with a spring groove in which a return spring 10 can be disposed. The inlet flow channel 11, the outlet flow channel 12, and the pressure chamber 13 are located within the lower shell. The inlet flow channel 11 and the outlet flow channel 12 are disposed at the bottom of the lower shell. One end of the inlet flow channel 11 opens toward the right side of the solenoid valve, and the other end of the inlet flow channel 11 communicates with the pressure chamber 13. One end of the outlet flow channel 12 opens toward the left side of the solenoid valve, and the other end of the outlet flow channel 12 communicates with the pressure chamber 13. A partition is disposed between the inlet flow channel 11 and the outlet flow channel 12. Connectors are connected to both the inlet flow channel 11 and the outlet flow channel 12 to connect to external pipelines through the connectors.

[0033] In some embodiments of the present application, along the axis of the sealing hole 131, the projection of the sealing hole 131 is located within the projection of the bottom plate, and the projection of the bottom plate covers the projection of the sealing hole 131. In this way, the bottom plate can fully seal the sealing hole 131.

[0034] In some embodiments of the present application, the stopper 4 can be an elastic retaining ring, and an annular positioning groove is provided on the side wall of the pressure chamber 13, and the elastic retaining ring is arranged in the annular positioning groove. In this way, the installation and positioning of the stopper 4 can be more convenient.

[0035] In some embodiments of the present application, the stopper 4 is arranged on the side of the auxiliary valve assembly 3 away from the bottom plate, and the limiting cooperation with the auxiliary valve assembly 3 along the axial direction of the sealing hole 131 means that when the auxiliary valve assembly 3 and the stopper 4 are in contact, the stopper 4 can prevent the auxiliary valve assembly 3 from moving along the axial direction of the sealing hole 131 toward the side away from the sealing hole 131, so that when the auxiliary valve assembly 3 moves toward the side away from the sealing hole 131, the main valve seat 2 can be driven by the stopper 4 to move toward the side away from the sealing hole 131 to open the solenoid valve.

[0036] In some embodiments of the present application, the return spring 10 may contact the auxiliary valve assembly 3 to provide elastic force to the auxiliary valve assembly 3. The return spring 10 may also contact the electromagnetic drive assembly 5 to provide elastic force to the auxiliary valve assembly 3 through the electromagnetic drive assembly 5.

[0037] In the above-mentioned solution of the present application, the internally balanced solenoid valve includes a valve body 1, which is provided with an inlet flow channel 11, an outlet flow channel 12 and a pressure chamber 13. The bottom surface of the pressure chamber 13 is provided with a sealing hole 131 communicating with the outlet flow channel 12, and the side surface of the pressure chamber 13 is provided with a guide hole 132 communicating with the inlet flow channel 11. The valve body 1 is also provided with a main valve seat 2, a secondary valve assembly 3, a spring assembly, an electromagnetic drive assembly 5 and a return spring 10. With this structure, when the electromagnetic drive assembly 5 is energized, the electromagnetic drive assembly 5 can drive the secondary valve assembly 3 to move. When the secondary valve assembly 3 moves, it drives the main valve seat 2 away from the sealing hole 131 through the stopper 4, so that the bottom plate of the main valve seat 2 can be separated from the bottom surface of the pressure chamber 13, thereby allowing oil to flow from the inlet flow channel 11 to the outlet flow channel 12, so that the solenoid valve is in an open state. When the electromagnetic drive assembly 5 is powered off, the return spring 10 provides an elastic force to the auxiliary valve assembly 3, so that the auxiliary valve assembly 3 presses the bottom plate of the main valve seat 2 against the bottom surface of the pressure chamber 13 through the spring assembly, thereby allowing the main valve seat 2 to seal the sealing hole 131, disconnecting the inlet flow channel 11 and the outlet flow channel 12, and thus closing the solenoid valve. Therefore, when using the above-mentioned solenoid valve of the present application, the oil flow can be controlled by the solenoid valve.

[0038] In addition, firstly, when the solenoid valve in the present application is in a closed state, the main valve seat 2 is pressed against the bottom surface of the pressure chamber 13 by the action of the return spring 10, the auxiliary valve assembly 3 and the spring assembly to achieve sealing; when the solenoid valve needs to be opened, the electromagnetic drive assembly 5 is first energized, and then the movement of the main valve seat 2 is controlled by the auxiliary valve assembly 3 to open the flow channel. Therefore, the electromagnetic drive assembly 5 does not need to be energized for a long time to control the main valve seat 2 to seal the sealing hole 131 so that the solenoid valve remains in a closed state, thereby reducing the power consumption of the solenoid valve. Secondly, when the solenoid valve is used in a large-diameter working condition or an oil environment with a high working pressure, the oil can first flow into the receiving groove of the main valve seat 2 to apply pressure to the main valve seat 2 and the auxiliary valve seat 31, so that the oil can participate in the sealing and starting process of the solenoid valve, thereby reducing the electromagnetic force required for the solenoid valve to work and reducing the power consumption of the solenoid valve.

[0039] Specifically, when the solenoid valve is in a closed state, the oil in the inlet flow channel 11 can sequentially flow through the guide hole 132 in the pressure chamber 13 and the perforation in the main valve seat 2 into the receiving groove of the main valve seat 2. With this structure, when the solenoid valve is used in a large-diameter working condition or a high-pressure differential oil environment, the oil can first flow into the receiving groove of the main valve seat 2 to apply pressure to the main valve seat 2, so that the main valve seat 2 can be pressed against the bottom surface of the pressure chamber 13 by the combined action of the oil, the return spring 10, and the spring assembly to seal. Because the solenoid valve is used in a large-diameter working condition or a high-pressure differential oil environment, the high-pressure differential oil can flow into the receiving groove of the main valve seat 2 to provide a compressive force to the main valve seat 2, so that the main valve seat 2 can press against the bottom surface of the pressure chamber 13. Therefore, without increasing the size and stiffness of the return spring 10, or with a small increase in the size and stiffness of the return spring 10, sealing can be achieved by utilizing the combined action of the oil, the return spring 10, and the spring assembly. As a result, when the electromagnetic drive assembly 5 is energized, the elastic force of the return spring 10 that it needs to overcome is small, thereby reducing the magnitude of the current flowing into the solenoid valve, reducing the power consumption of the solenoid valve, and reducing the weight of the solenoid valve.

[0040] In addition, when the electromagnetic drive component 5 is energized to drive the auxiliary valve component 3 to move, the oil flowing into the receiving tank can also generate pressure on the auxiliary valve component 3, causing the auxiliary valve component 3 to move toward the side away from the sealing hole 131, and then drive the return spring 10 to be compressed toward the side away from the sealing hole 131, so that the pressure of the oil can offset part of the elastic force of the return spring 10, thereby reducing the amount of current required for the electromagnetic drive component 5 to energize and drive the auxiliary valve component 3 to move, and further reducing the power consumption of the solenoid valve.

[0041] Furthermore, since the oil flowing into the receiving groove of the main valve seat 2 can provide a compressive force on the main valve seat 2, the main valve seat 2 can press against the bottom surface of the pressure chamber 13. Therefore, when oil pressure exists in the solenoid valve outlet flow channel 12, the oil pressure in the receiving groove of the main valve seat 2 can offset part of the oil pressure in the solenoid valve outlet flow channel 12, thereby improving the reverse sealing performance of the solenoid valve. When oil pressure exists in the solenoid valve outlet flow channel 12, the solenoid valve will not open and cause oil backflow. In addition, when the solenoid valve is opened, since the upper chamber is also opened, the response time of the solenoid valve closing is not affected.

[0042] Moreover, when the above-mentioned structure of the present application is adopted, the electromagnetic drive component 5 can drive the auxiliary valve component 3 to move to drive the main valve seat 2 to move to open the solenoid valve, so that the solenoid valve can achieve zero-pressure starting without the need for a pressure difference between the inlet flow channel 11 and the outlet flow channel 12.

[0043] In some embodiments of the present application, the auxiliary valve assembly 3 includes an auxiliary valve seat 31 and a sleeve 32; one end of the sleeve 32 is arranged in the accommodating groove, and the other end is connected to the electromagnetic drive assembly 5. A limit plate is provided on the outer wall of the sleeve 32, and the limit plate is limited and matched with the stopper 4 along the axial direction of the sealing hole 131; the auxiliary valve seat 31 is sleeved in the sleeve 32, and the auxiliary valve seat 31 and the sleeve 32 are limited and matched along the axial direction of the sleeve 32 and in the direction away from the sealing hole 131; the spring assembly includes a first spring 6 and a second spring 7, the first spring 6 is arranged between the auxiliary valve seat 31 and the bottom plate of the main valve seat 2, and the second spring 7 is arranged between the sleeve 32 and the bottom plate of the main valve seat 2. With this structure, when the electromagnetic drive assembly 5 is energized, the electromagnetic drive assembly 5 can drive the sleeve 32 to move. When the sleeve 32 moves, it drives the limit plate to press against the stopper 4, and then drives the main valve seat 2 to move away from the sealing hole 131 through the stopper 4, so that the bottom plate of the main valve seat 2 can be separated from the bottom surface of the pressure chamber 13, thereby allowing the oil to flow from the inlet flow channel 11 to the outlet flow channel 12, and the solenoid valve is in an open state. When the electromagnetic drive assembly 5 is de-energized, the return spring 10 can provide an elastic force for the sleeve 32, so that the sleeve 32 presses the bottom plate of the main valve seat 2 against the bottom surface of the pressure chamber 13 through the second spring 7, and applies a squeezing force toward the sealing hole 131 to the auxiliary valve seat 31, so that the main valve seat 2 can seal the sealing hole 131. At this time, the inlet flow channel 11 and the outlet flow channel 12 can be disconnected, and the solenoid valve is in a closed state.

[0044] In some embodiments of the present application, the limiting plate is an annular plate, and the annular plate is limitedly matched with the blocking member 4 along the axial direction of the sealing hole 131 .

[0045] In some embodiments of the present application, the auxiliary valve seat 31 includes a base and a connecting rod. The base is limited and cooperates with the sleeve 32 along the axial direction of the sleeve 32 and in the direction away from the sealing hole 131. One end of the connecting rod is connected to the base, and the other end passes through the sleeve 32 and extends into the center hole of the moving iron core 53 of the electromagnetic drive assembly 5 for positioning.

[0046] In some embodiments of the present application, a limiting protrusion may be provided on the interior of the sleeve 32 , and the base is provided between the limiting protrusion and the first spring 6 , and the limiting protrusion and the base are in limiting cooperation.

[0047] In some embodiments of the present application, the sleeve 32 includes a first cylindrical section, a connecting section, and a second cylindrical section, which are sequentially connected. The diameter of the first cylindrical section is smaller than that of the second cylindrical section. The auxiliary valve seat 31 is disposed within the second cylindrical section and abuts against the connecting section under the action of the first spring 6. With this structure, the auxiliary valve seat 31 can be limitedly engaged with the connecting section, so that when the sleeve 32 moves toward the sealing hole 131, the sleeve 32 can exert a force on the auxiliary valve seat 31, thereby allowing the auxiliary valve seat 31 to move toward the sealing hole 131.

[0048] In some embodiments of the present application, the connecting section is an annular plate, the inner ring of the annular plate is connected to the first barrel section, the outer ring of the annular plate is connected to the second barrel section, and the annular plate and the sealing hole 131 are coaxially arranged.

[0049] In some embodiments of the present application, a first sealing ring is provided between the auxiliary valve seat 31 and the connecting section. With this structure, the first sealing ring seals the auxiliary valve seat 31 and the connecting section, thereby improving the sealing performance between the auxiliary valve seat 31 and the connecting section and preventing fluid from leaking out of the gap between the auxiliary valve seat 31 and the connecting section.

[0050] In some embodiments of the present application, Figure 2As shown, a diaphragm 8 and a pressure block are provided in the pressure chamber 13. The diaphragm 8 divides the pressure chamber 13 into an upper chamber and a lower chamber. The main valve seat 2 is arranged in the lower chamber. The pressure block is connected to the sleeve 32. The diaphragm 8 is pressed between the pressure block and the sleeve 32. The valve body 1 also includes an external flow channel 9. One end of the external flow channel 9 is connected to the outlet flow channel 12, and the other end of the external flow channel 9 is connected to the upper chamber. With this structure, the oil in the outlet flow channel 12 can flow into the upper chamber through the external flow channel 9. After the oil flows into the upper chamber, the oil in the upper chamber can apply pressure to the diaphragm 8 toward the sealing hole 131, and then apply pressure to the sleeve 32 through the diaphragm 8, so that the sleeve 32 moves toward one side of the sealing hole 131. When the sleeve 32 moves, the bottom plate of the main valve seat 2 is pressed against the bottom surface of the pressure chamber 13 through the second spring 7, and by applying an extrusion force toward the sealing hole 131 to the auxiliary valve seat 31, the auxiliary valve seat 31 presses the bottom plate of the main valve seat 2 against the bottom surface of the pressure chamber 13 through the first spring 6, thereby improving the sealing effect of the main valve seat 2 on the sealing hole 131. Therefore, when there is oil pressure in the outlet flow channel 12 of the solenoid valve, the oil in the outlet flow channel 12 can flow into the upper chamber through the external flow channel 9 to apply pressure to the main valve seat 2 toward the side of the sealing hole 131, so that the main valve seat 2 can be pressed against the bottom surface of the pressure chamber 13 under the joint action of the reset spring 10, the oil pressure in the upper chamber, the oil pressure in the lower chamber, the first spring 6 and the second spring 7, thereby improving the reverse sealing performance of the solenoid valve, so that when there is oil pressure in the outlet flow channel 12 of the solenoid valve, the solenoid valve will not open and cause oil reflux.

[0051] In some embodiments of the present application, a pressure plate is provided in the upper chamber, which is tightly connected to the upper end of the lower shell, and the outer peripheral edge of the diaphragm 8 is pressed between the pressure plate and the upper end surface of the lower shell.

[0052] In some embodiments of the present application, a pressure relief screw is provided in the valve body 1, and the pressure relief screw is threadedly connected to the external flow channel 9 to press the pressure plate against the upper end surface of the lower shell body. A connecting groove is provided on the outer wall of the pressure relief thread, one end of the connecting groove is connected to the external flow channel 9, and the other end is connected to the upper chamber.

[0053] In some embodiments of the present application, the diaphragm 8 is an annular membrane body, which is sleeved outside the first cylindrical section of the sleeve 32. The pressure block and the connecting section of the sleeve 32 are tightly connected, and the inner ring edge of the diaphragm 8 is pressed between the pressure block and the connecting section.

[0054] In some embodiments of the present application, a guide groove is provided on the first cylinder section, and the interior of the first cylinder section is connected to the upper chamber through the guide groove. With this structure, the oil in the upper chamber can flow to the interior of the first cylinder section through the guide groove, and then accumulate above the auxiliary valve seat 31 and apply pressure to the auxiliary valve seat 31 toward the sealing hole 131. First, when the oil in the first cylinder section applies pressure to the auxiliary valve seat 31, the auxiliary valve seat 31 applies pressure to the main valve seat 2 through the first spring 6, so that the main valve seat 2 can be pressed against the bottom surface of the pressure chamber 13, thereby improving the reverse sealing performance of the solenoid valve, so that when there is oil pressure in the solenoid valve outlet flow channel 12, the solenoid valve will not open and cause oil backflow. Secondly, with this structure, when the electromagnetic drive assembly 5 is energized to open the solenoid valve, the electromagnetic drive assembly 5 first drives the main valve seat 2 toward the side away from the sealing hole 131 through the sleeve 32 to open the flow channel between the main valve seat 2 and the sealing hole 131. The oil in the inlet flow channel 11 then flows through this flow channel to the outlet flow channel 12. The movement of the main valve seat 2 can drive the auxiliary valve seat 31 toward the fixed iron core 52, allowing the push rod of the auxiliary valve seat 31 to contact and press against the fixed iron core 52. Because the fixed iron core 52 is fixed to the valve body 1, the fixed iron core 52 can exert a force on the auxiliary valve seat 31, causing the auxiliary valve seat 31 to move toward the sealing hole 131. When the auxiliary valve seat 31 moves, it can separate from the sleeve 32 to open the auxiliary valve seat 31. At this time, the oil can be depressurized through the auxiliary valve seat 31. Therefore, when the solenoid valve is opened, the main valve seat 2 can be opened first and then the auxiliary valve seat 31, resulting in a shorter response time when the solenoid valve is opened and higher operating efficiency.

[0055] In some embodiments of the present application, a gap is provided between the sleeve 32 and the surrounding plate of the main valve seat 2. With this structure, the oil in the main valve seat 2 can pass through the gap between the sleeve 32 and the main valve seat 2 and flow into the space between the diaphragm 8 and the main valve seat 2. At this time, the oil below the diaphragm 8 can exert pressure on the diaphragm 8, causing the diaphragm 8 to move toward the side away from the sealing hole 131. The movement of the diaphragm 8 can drive the sleeve 32 to move toward the side away from the sealing hole 131 to overcome part of the elastic force of the return spring 10. As a result, when the electromagnetic drive assembly 5 is energized, the elastic force of the return spring 10 that it needs to overcome is smaller, thereby reducing the magnitude of the current flowing into the solenoid valve and reducing the power consumption of the solenoid valve.

[0056] In some embodiments of the present application, Figure 1 and Figure 2As shown, the electromagnetic drive assembly 5 includes a coil 51, a fixed iron core 52, and a movable iron core 53. The movable iron core 53 is threadedly connected to the sleeve 32. The return spring 10 is disposed between the fixed iron core 52 and the movable iron core 53. When the coil 51 is energized, the movable iron core 53 moves, and the movement of the movable iron core 53 drives the sleeve 32. With this structure, when the coil 51 is energized, the movable iron core 53 can drive the sleeve 32 toward the side away from the sealing hole 131 to open the solenoid valve.

[0057] In some embodiments of the present application, the fixed core 52 is fixed to the bottom of the upper shell, the coil 51 is sleeved on the outside of the fixed core 52, the movable core 53 and the fixed core 52 are arranged opposite each other, the fixed core 52 is provided with a groove, the return spring 10 is disposed in the groove and abuts against the movable core 53, the center of the movable core 53 is provided with a center hole, one end of the auxiliary valve seat 31 extends through the center hole into the groove of the fixed core 52, and a sliding gap exists between the auxiliary valve seat 31 and the center hole. A magnetic conductive cover is provided on the outside of the coil 51, and an electrical connector socket is also connected to the upper shell, one end of the electrical connector socket is electrically connected to the coil 51, and the other end is connected to an external power supply.

[0058] In some embodiments of the present application, a second sealing ring is provided between the bottom plate and the bottom surface of the pressure chamber 13. With this structure, the second sealing ring seals the main valve seat 2 and the bottom surface of the pressure chamber 13, thereby improving the sealing performance between the main valve seat 2 and the bottom surface of the pressure chamber 13 and preventing the oil in the outlet flow channel 12 from leaking into the main valve seat 2 through the gap between the main valve seat 2 and the bottom surface of the pressure chamber 13.

[0059] In some embodiments of the present application, the enclosure is an annular enclosure having a plurality of guide holes 132 disposed thereon, the guide holes 132 being evenly distributed along the circumference of the annular enclosure. With this structure, the oil in the receiving groove of the main valve seat 2 can flow to the exterior of the main valve seat 2 through the plurality of guide holes 132, thereby increasing the speed at which the oil in the receiving groove flows to the exterior of the main valve seat 2.

[0060] In some embodiments of the present application, the portion of the surrounding plate of the main valve seat 2 located above the guide hole 132 fits tightly against the inner wall of the pressure chamber 13, and a flow gap exists between the portion of the surrounding plate of the main valve seat 2 located below the guide hole 132 and the inner wall of the pressure chamber 13, so that when the oil in the main valve seat 2 flows out through the perforation, it can flow out through the flow gap between the surrounding plate and the inner wall of the pressure chamber 13, thereby avoiding affecting the outflow of the oil when the surrounding plate and the pressure chamber 13 are in contact.

[0061] The working process of the solenoid valve in this application is as follows:

[0062] Example 1:

[0063] In this embodiment, the pressure difference between the inlet and outlet of the solenoid valve is greater than the first set value, which is the oil pressure value required when the oil drives the sleeve 32 to move and contact the blocker 4, that is, the elastic force of the reset spring 10 to be overcome when the driving sleeve 32 moves and contacts the blocker 4, specifically 25kPa.

[0064] like Figure 1 and Figure 2 As shown, when oil with a pressure greater than a first set value flows into the inlet flow channel 11, the oil flows through the guide hole 132 of the pressure chamber 13 and the perforation of the main valve seat 2 into the receiving groove of the main valve seat 2. When the upper surface of the oil contacts the lower surface of the sleeve 32, the oil flows through the gap between the sleeve 32 and the main valve seat 2 to the space below the diaphragm 8. In this way, the oil acts on the diaphragm 8, the sleeve 32, and the auxiliary valve seat 31, causing the sleeve 32 and the auxiliary valve seat 31 to move toward the side away from the sealing hole 131. Because the inlet and outlet pressure differential is greater than the first set value, the limit plate on the sleeve 32 can move to abut against the stopper 4. At this time, the main valve seat 2 seals the sealing hole 131 under the combined action of the oil pressure, the spring assembly, the auxiliary valve assembly 3, and the return spring 10, and the first spring 6 is in an uncompressed state.

[0065] like Figure 5 and Figure 6 As shown, when the coil 51 of the electromagnetic drive assembly 5 is energized, the moving iron core 53 moves away from the sealing hole 131 under the action of the magnetic field of the coil 51, and the moving iron core 53 drives the sleeve 32 to move away from the sealing hole 131 when it moves. Since the limit plate on the sleeve 32 abuts against the stopper 4 on the main valve seat 2 when no power is supplied, the sleeve 32 can directly drive the main valve seat 2 to move toward the side away from the sealing hole 131 when it moves, so that the bottom plate of the main valve seat 2 and the bottom surface of the pressure chamber 13 are separated, so that the oil in the inlet flow channel 11 can pass through the space between the main valve seat 2 and the pressure chamber 13 and flow into the sealing hole 131, and then flow through the sealing hole 131 to the outlet flow channel 12. At the same time, the oil in the outlet flow channel 12 can flow into the upper chamber above the diaphragm 8 through the outer flow channel 9. The oil in the upper chamber flows into the first cylindrical section of the sleeve 32 through the guide groove. The oil in the first cylindrical section can exert pressure on the auxiliary valve seat 31. In the process of the main valve seat 2 moving and driving the auxiliary valve seat 31 to move toward the fixed iron core 52, the push rod of the auxiliary valve seat 31 can contact and press against the fixed iron core 52. Since the fixed iron core 52 is fixed to the valve body 1, the fixed iron core 52 can exert a force on the auxiliary valve seat 31, so that the auxiliary valve seat 31 can move toward one side of the sealing hole 131. When the auxiliary valve seat 31 moves, it can separate from the sleeve 32 to realize the opening of the auxiliary valve seat 31. At this time, the oil can be depressurized through the auxiliary valve seat 31.

[0066] When the coil 51 of the electromagnetic drive assembly 5 is de-energized, the moving iron core 53 is no longer magnetically affected by the coil 51. First, the main valve seat 2 moves toward the sealing hole 131 under the action of the return spring 10, the auxiliary valve seat 31, the oil in the upper chamber, the oil in the lower chamber, and the spring assembly. This causes the base of the main valve seat 2 to abut against the bottom surface of the pressure chamber 13, sealing the sealing hole 131 and preventing the oil in the inlet flow channel 11 from flowing into the outlet flow channel 12. Secondly, after the main valve seat 2 seals the sealing hole 131, the sleeve 32 and the auxiliary valve assembly 3 further seal toward the sealing hole 131 under the action of the return spring 10 and the oil in the upper chamber. This compresses the first spring 6 and the second spring 7, allowing the main valve seat 2 to press against the bottom surface of the pressure chamber 13. Simultaneously, the first spring 6 exerts an elastic force on the auxiliary valve seat 31, pressing it against the connecting section of the sleeve 32, thereby sealing the pressure relief oil circuit. Finally, the oil in the upper chamber can be discharged through the pressure relief screw.

[0067] Example 2:

[0068] In this embodiment, the pressure difference between the inlet and outlet of the solenoid valve is less than the second set value and greater than or equal to 0. The second set value is the oil pressure value when the first spring 6 is still in a compressed state when the oil drives the sleeve 32 to move.

[0069] like Figure 3 and Figure 4 As shown, when oil with a pressure less than the second set value and greater than or equal to zero is introduced into the inlet flow channel 11, the oil flows through the guide hole 132 of the pressure chamber 13 and the perforation of the main valve seat 2 into the receiving groove of the main valve seat 2. When the upper surface of the oil contacts the lower surface of the sleeve 32, the oil flows through the gap between the sleeve 32 and the main valve seat 2 to the space below the diaphragm 8. In this way, the oil acts on the diaphragm 8, the sleeve 32, and the auxiliary valve seat 31, causing the sleeve 32 and the auxiliary valve seat 31 to move away from the sealing hole 131. Because the inlet and outlet pressure differential is less than the second set value and greater than or equal to zero, the stop plate on the sleeve 32 does not abut the stopper 4 after movement. At this point, the main valve seat 2 seals the sealing hole 131 under the combined action of the oil pressure, the spring assembly, the auxiliary valve assembly 3, and the return spring 10. The first spring 6 and the second spring 7 are both in a compressed state, and the spring assembly and the return spring 10 are in a balanced state.

[0070] like Figure 5 and Figure 6As shown, when the coil 51 of the electromagnetic drive assembly 5 is energized, the moving iron core 53 moves away from the sealing hole 131 under the action of the magnetic field of the coil 51, and the moving iron core 53 drives the sleeve 32 to move away from the sealing hole 131 when it moves. Since the limit plate on the sleeve 32 does not contact the stopper 4 on the main valve seat 2 when no power is supplied, the sleeve 32 first moves toward the stopper 4 for a distance and then abuts against the stopper 4, and then drives the main valve seat 2 to move toward the side away from the sealing hole 131, so that the bottom plate of the main valve seat 2 and the bottom surface of the pressure chamber 13 are separated, so that the oil in the inlet flow channel 11 can pass through the space between the main valve seat 2 and the pressure chamber 13 and flow into the sealing hole 131, and then flow to the outlet flow channel 12 through the sealing hole 131. At the same time, the oil in the outlet flow channel 12 can flow into the upper chamber above the diaphragm 8 through the outer flow channel 9. The oil in the upper chamber flows into the first cylindrical section of the sleeve 32 through the guide groove. The oil in the first cylindrical section can exert pressure on the auxiliary valve seat 31. In the process of the main valve seat 2 moving and driving the auxiliary valve seat 31 to move toward the fixed iron core 52, the push rod of the auxiliary valve seat 31 can contact and press against the fixed iron core 52. Since the fixed iron core 52 is fixed to the valve body 1, the fixed iron core 52 can exert a force on the auxiliary valve seat 31, so that the auxiliary valve seat 31 can move toward one side of the sealing hole 131. When the auxiliary valve seat 31 moves, it can separate from the sleeve 32 to realize the opening of the auxiliary valve seat 31. At this time, the oil can be depressurized through the auxiliary valve seat 31.

[0071] When the coil 51 of the electromagnetic drive assembly 5 is de-energized, the moving iron core 53 is no longer magnetically affected by the coil 51. First, the main valve seat 2 moves toward the sealing hole 131 under the action of the return spring 10, the auxiliary valve seat 31, the oil in the upper chamber, the oil in the lower chamber, and the spring assembly. This causes the base of the main valve seat 2 to abut against the bottom surface of the pressure chamber 13, sealing the sealing hole 131 and preventing the oil in the inlet flow channel 11 from flowing into the outlet flow channel 12. Secondly, after the main valve seat 2 seals the sealing hole 131, the sleeve 32 and the auxiliary valve assembly 3 further seal toward the sealing hole 131 under the action of the return spring 10 and the oil in the upper chamber. This causes the first spring 6 to begin to compress, further compressing the second spring 7, thereby pressing the main valve seat 2 against the bottom surface of the pressure chamber 13. Simultaneously, the first spring 6 can exert an elastic force on the auxiliary valve seat 31, pressing the auxiliary valve seat 31 against the connecting section of the sleeve 32 to seal the pressure relief oil circuit. Finally, the oil in the upper chamber can be discharged through the pressure relief screw.

[0072] Example 3:

[0073] In this embodiment, the pressure difference between the inlet and outlet of the solenoid valve is greater than the second set value and less than the first set value.

[0074] When oil pressure greater than the second set value and less than the first set value enters the inlet flow channel 11, the oil flows through the guide hole 132 of the pressure chamber 13 and the perforation of the main valve seat 2 into the receiving groove of the main valve seat 2. When the upper surface of the oil contacts the lower surface of the sleeve 32, the oil flows through the gap between the sleeve 32 and the main valve seat 2 to the space below the diaphragm 8. In this way, the oil acts on the diaphragm 8, the sleeve 32, and the auxiliary valve seat 31, causing the sleeve 32 and the auxiliary valve seat 31 to move away from the sealing hole 131. Because the pressure is greater than the second set value and less than the first set value, the stop plate on the sleeve 32 does not abut the stopper 4 after movement. At this point, the main valve seat 2 seals the sealing hole 131 under the combined action of the oil pressure, the spring assembly, the auxiliary valve assembly 3, and the return spring 10. The first spring 6 is in a free state, and the spring assembly and the return spring 10 are in a balanced state. The operating process of the electromagnetic drive assembly 5 after powering on and off in this example is shown in Example 2.

[0075] Example 4:

[0076] In this embodiment, the solenoid valve is not pressurized, and the pressure difference between the inlet and outlet of the solenoid valve is 0.

[0077] When the solenoid valve is not pressurized, the solenoid valve is opened only by the electromagnetic force of the electromagnetic drive assembly 5 after being energized.

[0078] After the electromagnetic drive assembly 5 is powered off, the main valve seat 2 first moves toward the sealing hole 131 under the action of the return spring 10, the auxiliary valve seat 31, the oil in the upper chamber, the oil in the lower chamber, and the spring assembly. This causes the base of the main valve seat 2 to abut against the bottom surface of the pressure chamber 13, sealing the sealing hole 131 and preventing the oil in the inlet channel 11 from flowing into the outlet channel 12. Secondly, after the main valve seat 2 seals the sealing hole 131, the sleeve 32 and the auxiliary valve assembly 3 further seal toward the sealing hole 131 under the action of the return spring 10 and the oil in the upper chamber. This causes the first spring 6 to begin to compress and further compresses the second spring 7, thereby pressing the main valve seat 2 against the bottom surface of the pressure chamber 13. Simultaneously, the first spring 6 can exert an elastic force on the auxiliary valve seat 31, causing it to press against the connecting section of the sleeve 32, thereby sealing the pressure relief oil circuit. Finally, the oil in the upper chamber can be discharged through the pressure relief screw.

[0079] It can be understood that from the working process of the solenoid valve in the embodiment of the present application, when the outlet is reversely pressurized, there will be fuel pressure on both the auxiliary valve seat 31 and the main valve seat 2. The fuel pressure on the main valve seat 2 is upward, and the fuel pressure on the auxiliary valve seat 31 is downward. For the force analysis of the main valve seat 2, the main valve seat 2 is subjected to downward forces including: the spring pressure on the main valve, the spring pressure on the pressure relief valve, and the fuel pressure. The main valve seat 2 is subjected to an upward force with a supporting force. For the force analysis of the auxiliary valve seat 31, the auxiliary valve seat 31 is subjected to downward forces including: the supporting force of the sleeve 32 and the fuel pressure. In order to ensure the normal sealing of the two valve seats, it is necessary to ensure that the supporting force of each sealing surface is greater than the required sealing pressure. Among them, the sufficient condition for the reverse sealing failure is: the main valve seat 2 is open or the auxiliary valve seat 31 is open.

[0080] The main valve seat 2 opens when the support force of the bottom surface of the pressure chamber 13 on the main valve seat 2 is less than the required sealing force. However, in the embodiment of the present application, since the combined force of the fuel pressure within the pressure chamber 13 is downward, the support force of the bottom surface of the pressure chamber 13 on the main valve seat 2 is always greater than the initial spring force, thus preventing the main valve seat 2 from opening. The secondary valve seat 31 opens when the support force of the sleeve 32 on the secondary valve seat 31 is less than the required sealing force. Assuming that the sleeve 32 does not move downward as a whole under the action of fuel pressure, when the fuel pressure gradually increases to the set value, the support force between the secondary valve seat 31 and the sleeve 32 is exactly equal to the sealing pressure. However, this is not the case in reality. Under the action of fuel pressure, the sleeve 32 moves downward, i.e., the sealing force is much greater than the preset sealing pressure. At this time, the sealing force is composed of two parts: the compression force of the non-moving spring plus the compression force of the moving spring. The spring force of the movement comes from the spring force of the compressed first spring 6. At the same time, the fuel pressure area under the auxiliary valve seat 31 is larger than the fuel pressure area above the auxiliary valve seat 31, ensuring that the auxiliary valve seat 31 is reliably sealed and prevented from opening. Thus, the solenoid valve in this embodiment of the present application can achieve a reverse sealing function.

[0081] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0083] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0084] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An internally balanced solenoid valve, characterized in that: The valve comprises a valve body, wherein the valve body is provided with an inlet flow channel, an outlet flow channel and a pressure chamber, a sealing hole communicating with the outlet flow channel is provided on the bottom surface of the pressure chamber, and a guide hole communicating with the inlet flow channel is provided on the side surface of the pressure chamber; The valve body is also provided with a main valve seat, an auxiliary valve assembly, a spring assembly, an electromagnetic drive assembly and a return spring; The main valve seat is arranged in the pressure chamber, and the main valve seat includes a bottom plate and a surrounding plate. The bottom plate corresponds to the sealing hole, and the bottom plate and the surrounding plate are connected to form a receiving groove with an opening direction away from the sealing hole. The surrounding plate is provided with a through hole for communicating with the guide hole. Along the axial direction of the sealing hole, the projected area of ​​the sealing hole is smaller than the projected area of ​​the bottom plate. One end of the auxiliary valve assembly is arranged in the accommodating groove, and the other end is connected to the electromagnetic drive assembly. A stopper is provided on the side wall of the accommodating groove. The stopper is arranged on a side of the auxiliary valve assembly away from the bottom plate and is limitedly engaged with the auxiliary valve assembly along the axial direction of the sealing hole; The electromagnetic drive assembly is used to drive the auxiliary valve assembly to move, and when the auxiliary valve assembly moves, the main valve seat is driven to move away from the sealing hole through the stopper; The spring assembly is arranged between the auxiliary valve assembly and the bottom plate, and the return spring is used to provide an elastic force for the auxiliary valve assembly so that the auxiliary valve assembly presses the bottom plate of the main valve seat against the bottom surface of the pressure chamber through the spring assembly.

2. The internally balanced solenoid valve according to claim 1, characterized in that: The auxiliary valve assembly includes an auxiliary valve seat and a sleeve; One end of the sleeve is arranged in the accommodating groove, and the other end is connected to the electromagnetic drive assembly. A limiting plate is provided on the outer wall of the sleeve, and the limiting plate is limitedly matched with the stopper along the axial direction of the sealing hole; The auxiliary valve seat is sleeved in the sleeve, and along the axial direction of the sleeve and in a direction away from the sealing hole, the auxiliary valve seat and the sleeve are limitedly matched; The spring assembly includes a first spring and a second spring. The first spring is disposed between the auxiliary valve seat and a bottom plate of the main valve seat, and the second spring is disposed between the sleeve and the bottom plate of the main valve seat.

3. The internally balanced solenoid valve according to claim 2, characterized in that: The sleeve comprises a first barrel section, a connecting section and a second barrel section which are connected in sequence, wherein the diameter of the first barrel section is smaller than the diameter of the second barrel section; The auxiliary valve seat is arranged in the second cylinder section and abuts against the connecting section under the action of the first spring.

4. The internally balanced solenoid valve according to claim 3, characterized in that: A first sealing ring is provided between the auxiliary valve seat and the connecting section.

5. The internally balanced solenoid valve according to claim 3, characterized in that: A diaphragm and a pressure block are provided in the pressure chamber, the diaphragm divides the pressure chamber into an upper chamber and a lower chamber, the main valve seat is provided in the lower chamber, the pressure block is connected to the sleeve, and the diaphragm is pressed tightly between the pressure block and the sleeve; The valve body further includes an outer flow channel, one end of the outer flow channel is communicated with the outlet flow channel, and the other end of the outer flow channel is communicated with the upper chamber.

6. The internally balanced solenoid valve according to claim 5, characterized in that: The first barrel section is provided with a guide groove, and the interior of the first barrel section is communicated with the upper chamber through the guide groove.

7. The internally balanced solenoid valve according to claim 2, characterized in that: There is a gap between the sleeve and the surrounding plate of the main valve seat.

8. The internally balanced solenoid valve according to claim 2, characterized in that: The electromagnetic drive assembly includes a coil, a fixed iron core and a moving iron core. The moving iron core and the sleeve are threadedly connected. The reset spring is arranged between the fixed iron core and the moving iron core. When the coil is energized, it drives the moving iron core to move, and when the moving iron core moves, it drives the sleeve to move.

9. The internally balanced solenoid valve according to claim 1, characterized in that: A second sealing ring is provided between the bottom plate and the bottom surface of the pressure chamber.

10. The internally balanced solenoid valve according to claim 1, characterized in that: The enclosure plate is an annular enclosure plate, and a plurality of perforations are provided on the annular enclosure plate. The plurality of perforations are evenly distributed along the circumference of the annular enclosure plate.

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