Internal balance type electromagnetic valve

Abstract

The invention discloses an internal balance type electromagnetic valve, which belongs to the field of electromagnetic valves and comprises a valve body, an inlet runner, an outlet runner and a pressure cavity are arranged in the valve body, a sealing hole communicated with the outlet runner is formed in the bottom surface of the pressure cavity, and a flow guide hole communicated with the inlet runner is formed in the side surface of the pressure cavity; a main valve seat, an auxiliary valve assembly, a spring assembly, an electromagnetic driving assembly and a reset spring are further arranged in the valve body. The main valve seat is arranged in the pressure cavity; one end of the auxiliary valve assembly is arranged in the containing groove, the other end of the auxiliary valve assembly is connected with the electromagnetic driving assembly, and a blocking piece is arranged on the side wall of the containing groove, is arranged on the side, away from the bottom plate, of the auxiliary valve assembly and is in limiting fit with the auxiliary valve assembly in the axial direction of the sealing hole; the spring assembly is arranged between the auxiliary valve assembly and the bottom plate, the reset spring is used for providing elastic acting force for the auxiliary valve assembly, and therefore power consumption of the electromagnetic valve can be reduced.

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 switch device controlled by electromagnetic principle, which has the advantages of quick response, low power consumption, compact structure, high reliability, high safety, wide application range, easy integration and low price. Usually, in the fuel system of aerospace equipment, a solenoid valve is needed to control the on and off of the oil.

[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 an elastic force for the moving iron core. The piston and the moving iron core are connected. The valve body is also equipped with a liquid inlet channel, a liquid outlet channel and a connecting channel. One end of the connecting channel is connected to the liquid inlet channel, and the other end is connected to the liquid outlet channel.

[0004] With the above structure, when the coil is energized, the moving iron core drives the piston to move and seal the connecting flow channel under the action of the magnetic field of the coil, so that the inlet flow channel and the outlet flow channel are disconnected, preventing the oil from flowing out through the valve body; when the coil is de-energized, the moving iron core and the piston open the connecting flow channel under the elastic action of the spring, so that the inlet flow channel and the outlet flow channel are connected, and then the oil can flow out through the valve body, so that the solenoid valve can control the on and off of the oil. However, when the solenoid valve is applied to large-diameter working conditions, the electromagnetic force required for the solenoid valve to seal is large, resulting in high power consumption of the solenoid valve. 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, including 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 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, and the main valve seat includes 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 surround a receiving groove with an opening direction away from the sealing hole, and a through hole for connecting to the guide hole is provided on the surrounding plate, along the axis 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 driving assembly. A baffle is provided on the side wall of the accommodating groove, and the baffle is arranged on the side of the auxiliary valve assembly away from the bottom plate, and is limitedly matched with the auxiliary valve assembly along the axial direction of the sealing hole; the electromagnetic driving 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 baffle; 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 stopper 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 barrel section, a connecting section and a second barrel section connected in sequence, 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 barrel 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 connected 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. The 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 scheme of the present application, the internal balanced solenoid valve includes a valve body, an inlet flow channel, an outlet flow channel and a pressure chamber are arranged in the valve body, a sealing hole connected to the outlet flow channel is arranged on the bottom surface of the pressure chamber, and a guide hole connected to the inlet flow channel is arranged on the side of the pressure chamber. The valve body is also provided with a main valve seat, a sub-valve assembly, a spring assembly, an electromagnetic drive assembly and a reset spring. With this structure, when the electromagnetic drive assembly is powered on, the electromagnetic drive assembly can drive the sub-valve assembly to move, and when the sub-valve assembly moves, the main valve seat is driven to move 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, so that the oil can flow from the inlet flow channel to the outlet flow channel, so that the electromagnetic valve is in an open state. When the electromagnetic drive assembly is powered off, the reset spring can provide an elastic force for the sub-valve assembly, so that the sub-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, and the inlet flow channel and the outlet flow channel can be disconnected, thereby making the electromagnetic valve in a closed state. Therefore, when the solenoid valve described above is used, the on-off of the oil can be controlled by the solenoid valve.

[0018] In addition, firstly, when the solenoid valve in the present application is in a closed state, the main valve seat is pressed against the bottom surface of the pressure chamber under the action of the reset 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 applied to 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 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 A;

[0022] Figure 3 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 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 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 is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0028] Generally, a solenoid valve is a switch device controlled by electromagnetic principle, which has the advantages of quick response, low power consumption, compact structure, high reliability, high safety, wide application range, easy integration and low price. In the fuel system of aerospace equipment, a solenoid valve is needed to control the on and off of the oil.

[0029] A common solenoid valve includes a valve body, an electromagnetic drive assembly, a piston and a spring are arranged in the valve body, and 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 relative to each other, the spring provides an elastic force for the moving iron core, the piston and the moving iron core are connected, and the valve body is also provided with 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 moving iron core drives the piston to move and seal the connecting flow channel under the action of the magnetic field of the coil, so that the inlet flow channel and the outlet flow channel are disconnected, and the oil is prevented from flowing out through the valve body; when the coil is de-energized, the moving iron core and the piston open the connecting flow channel under the elastic action of the spring, so that the inlet flow channel and the outlet flow channel are connected, and then the oil can flow out through the valve body, so that the solenoid valve can control the on and off of the oil. However, when the solenoid valve is applied to large-diameter working conditions, the electromagnetic force required for the solenoid valve to seal is large, resulting in high power consumption of the solenoid valve.

[0030] Another common solenoid valve includes a valve body, an electromagnetic drive assembly and a piston are arranged in the valve body, the electromagnetic drive assembly includes a coil, a fixed iron core and a moving iron core, a spring is arranged between the fixed iron core and the moving iron core, the piston is connected to the moving iron core, and the valve body is also provided with 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, the moving iron core and the piston can seal the connecting flow channel under the elastic action of the spring, so that the inlet flow channel and the outlet flow channel are disconnected to prevent the oil from flowing out through the valve body; or, after the coil is energized, the moving iron core drives the piston to move to open the connecting flow channel under the action of the magnetic field of the coil, so that the inlet flow channel and the outlet flow channel are connected, so that the oil can flow out through the valve body. Among them, when the solenoid valve is used in a high pressure difference oil environment, the solenoid valve needs to use a large-size, high-rigidity spring so that the spring can provide sufficient elastic force for the piston to ensure that the piston can seal the connecting flow channel. Therefore, when the solenoid valve is powered on, a large current needs to be passed through the coil to enhance the magnetic effect of the moving iron core, so that the moving iron core can overcome the elastic force of the spring and drive the piston to open the connecting flow channel, ensuring that the solenoid valve can control the on and off of the oil. However, when this structure is adopted, the power consumption of the solenoid valve is increased because the current passed through the solenoid valve is large.

[0031] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The embodiment of the present invention provides an internally balanced solenoid valve, including a valve body 1, wherein an inlet flow channel 11, an outlet flow channel 12 and a pressure chamber 13 are arranged in the valve body 1, a sealing hole 131 communicating with the outlet flow channel 12 is arranged on the bottom surface of the pressure chamber 13, and a guide hole 132 communicating with the inlet flow channel 11 is arranged 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 arranged in the valve body 1; the main valve seat 2 is arranged in the pressure chamber 13, and the main valve seat 2 includes 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 whose opening direction is 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 arranged 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 driving assembly 5. A baffle 4 is provided on the side wall of the accommodating groove. The baffle 4 is arranged on the side of the auxiliary valve assembly 3 away from the bottom plate, and is limitedly matched with the auxiliary valve assembly 3 along the axial direction of the sealing hole 131; the electromagnetic driving assembly 5 is used to drive the auxiliary valve assembly 3 to move, and when the auxiliary valve assembly 3 moves, the main valve seat 2 is driven to move away from the sealing hole 131 through the baffle 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, and the upper shell and the lower shell are fastened with bolts. The electromagnetic drive assembly 5 is arranged in the upper shell, and a spring groove is arranged in the upper shell. The return spring 10 can be arranged in the spring groove. The inlet flow channel 11, the outlet flow channel 12 and the pressure chamber 13 are located in the lower shell. The bottom of the lower shell is provided with an inlet flow channel 11 and an outlet flow channel 12. One end of the inlet flow channel 11 opens to the right side of the electromagnetic valve, and the other end of the inlet flow channel 11 is connected to the pressure chamber 13. One end of the outlet flow channel 12 opens to the left side of the electromagnetic valve, and the other end of the outlet flow channel 12 is connected to the pressure chamber 13. A partition is arranged between the inlet flow channel 11 and the outlet flow channel 12. Joints are connected to the inlet flow channel 11 and the outlet flow channel 12 to communicate with external pipelines through the joints.

[0033] In some embodiments of the present application, along the axis direction 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 may 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 made 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 scheme of the present application, the internally balanced solenoid valve comprises a valve body 1, in which an inlet flow channel 11, an outlet flow channel 12 and a pressure chamber 13 are arranged, a sealing hole 131 communicating with the outlet flow channel 12 is arranged on the bottom surface of the pressure chamber 13, and a flow guide hole 132 communicating with the inlet flow channel 11 is arranged on the side surface of the pressure chamber 13, and a main valve seat 2, a secondary valve assembly 3, a spring assembly, an electromagnetic drive assembly 5 and a reset spring 10 are also arranged in the valve body 1. 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, and when the secondary valve assembly 3 moves, the main valve seat 2 is driven 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, so that the oil can flow from the inlet flow channel 11 to the outlet flow channel 12, so that the electromagnetic valve is in an open state. When the electromagnetic drive assembly 5 is powered off, the reset spring 10 can provide 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, so that the main valve seat 2 can seal the sealing hole 131, and the inlet flow channel 11 and the outlet flow channel 12 can be disconnected, thereby making the electromagnetic valve closed. Therefore, when the above-mentioned electromagnetic valve of the present application is used, the on-off of the oil can be controlled by the electromagnetic 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 reset 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 applied to 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 flow into the receiving groove of the main valve seat 2 through the guide hole 132 on the pressure chamber 13 and the through hole on the main valve seat 2 in sequence. 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 for sealing under the joint action of the oil, the return spring 10 and the spring assembly. Since 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 clamping force for the main valve seat 2, so that the main valve seat 2 can press 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, so that 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 passed through 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 groove 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, thereby driving 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 drive the auxiliary valve component 3 to move, and further reducing the power consumption of the solenoid valve.

[0041] In addition, since the oil flowing into the receiving groove of the main valve seat 2 can provide a clamping force for the main valve seat 2, the main valve seat 2 can press the bottom surface of the pressure chamber 13. Therefore, when there is oil pressure in the outlet flow channel 12 of the solenoid valve, the oil pressure in the receiving groove of the main valve seat 2 can offset part of the oil pressure in the outlet flow channel 12 of the solenoid valve, 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. In addition, when the solenoid valve is opened, since the upper chamber is also opened at the same time, it will not affect the response time of the solenoid valve closing.

[0042] Furthermore, when the above-mentioned structure of the present application is adopted, the electromagnetic drive assembly 5 can drive the auxiliary valve assembly 3 to move to drive the main valve seat 2 to move and 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 powered on, the electromagnetic drive assembly 5 can drive the sleeve 32 to move, and 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, so that the oil can 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 reset 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 a 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 matched in a limiting manner.

[0047] In some embodiments of the present application, the sleeve 32 includes a first barrel section, a connecting section, and a second barrel section connected in sequence, the diameter of the first barrel section is smaller than the diameter of the second barrel section; the auxiliary valve seat 31 is arranged in the second barrel 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 matched with the connecting section, so that when the sleeve 32 moves toward the sealing hole 131, the sleeve 32 can apply a force to the auxiliary valve seat 31, so that the auxiliary valve seat 31 can 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 cylinder section, the outer ring of the annular plate is connected to the second cylinder 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 auxiliary valve seat 31 and the connecting section are sealed by the first sealing ring, which can improve the sealing performance between the auxiliary valve seat 31 and the connecting section and prevent the fluid from flowing 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, and 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. By adopting 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 the extrusion force toward the sealing hole 131 is applied to the auxiliary valve seat 31, so that 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 return 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, the pressure plate 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, and a connecting groove is opened 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 diaphragm 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 toward the sealing hole 131 to the auxiliary valve seat 31. 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 outlet flow channel 12 of the solenoid valve, the solenoid valve will not open to cause oil reflux. Secondly, with this structure, when the electromagnetic drive assembly 5 is powered on to open the electromagnetic valve, the electromagnetic drive assembly 5 first drives the main valve seat 2 to move 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, and then the oil in the inlet flow channel 11 flows through the flow channel to the outlet flow channel 12, wherein the main valve seat 2 can drive the auxiliary valve seat 31 to move toward the fixed iron core 52 when it moves, so that the top 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 apply a force to the auxiliary valve seat 31, so that the auxiliary valve seat 31 can move toward one side of the sealing hole 131, and the auxiliary valve seat 31 can be separated from the sleeve 32 when it moves to realize the opening of the auxiliary valve seat 31. At this time, the oil can be depressurized through the auxiliary valve seat 31. Therefore, when the electromagnetic valve is opened, the main valve seat 2 can be opened first and then the auxiliary valve seat 31, so that the response time of the electromagnetic valve when it is opened is short and the working efficiency is high.

[0055] In some embodiments of the present application, there is a gap between the sleeve 32 and the enclosure 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 under the diaphragm 8 can exert pressure on the diaphragm 8, so that the diaphragm 8 moves toward the side away from the sealing hole 131. When the diaphragm 8 moves, it can drive the sleeve 32 to move toward the side away from the sealing hole 131 to overcome the elastic force of part of the return spring 10, so that when the electromagnetic drive assembly 5 is powered on, the elastic force of the return spring 10 to be overcome is small, thereby reducing the magnitude of the current passed 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 moving iron core 53, the moving iron core 53 and the sleeve 32 are threadedly connected, and the return spring 10 is arranged between the fixed iron core 52 and the moving iron core 53. When the coil 51 is energized, the moving iron core 53 is driven to move, and when the moving iron core 53 moves, the sleeve 32 is driven to move. With this structure, after the coil 51 is energized, the moving iron core 53 can drive the sleeve 32 to move toward the side away from the sealing hole 131 to open the electromagnetic valve.

[0057] In some embodiments of the present application, the fixed iron core 52 is fixed to the bottom of the upper shell, the coil 51 is sleeved on the outer side of the fixed iron core 52, the moving iron core 53 and the fixed iron core 52 are arranged opposite to each other, a groove is provided on the fixed iron core 52, the reset spring 10 is arranged in the groove and abuts against the moving iron core 53, a center hole is provided in the center of the moving iron core 53, one end of the auxiliary valve seat 31 passes through the center hole and extends into the groove of the fixed iron core 52, and there is a sliding gap between the auxiliary valve seat 31 and the center hole. Among them, the outer sleeve of the coil 51 is provided with a magnetic conductive cover, and the upper shell is also connected to an electrical connector socket, 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, and a plurality of guide holes 132 are provided on the annular enclosure, and the plurality of guide holes 132 are 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 outside 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 outside 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 there is a flow gap 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 inlet and outlet pressure difference of the solenoid valve is greater than the first set value, which is the oil pressure required when the oil drives the sleeve 32 to move and contact the blocker 4, that is, the elastic force of the return spring 10 to be overcome when the driving sleeve 32 moves and contacts the blocker 4, specifically 25 kPa.

[0064] like Figure 1 and Figure 2 As shown, when the oil pressure greater than the first set value is passed into the inlet flow channel 11, the oil flows into the receiving groove of the main valve seat 2 through the guide hole 132 of the pressure chamber 13 and the perforation of the main valve seat 2. When the upper surface of the oil contacts the lower surface of the sleeve 32, the oil flows to the space below the diaphragm 8 through the gap between the sleeve 32 and the main valve seat 2. In this way, the oil acts on the diaphragm 8, the sleeve 32 and the auxiliary valve seat 31, so that the sleeve 32 and the auxiliary valve seat 31 move toward the side away from the sealing hole 131. Since the inlet and outlet pressure difference 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 joint 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 component 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 to 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 through the outer flow channel 9 to the upper chamber above the diaphragm 8, and the oil in the upper chamber flows through the guide groove to the first cylinder section of the sleeve 32. The oil in the first cylinder 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 powered off, the moving iron core 53 is no longer subjected to the magnetic effect of the coil 51. First, the main valve seat 2 moves toward the sealing hole 131 under the action of the reset spring 10, the auxiliary valve seat 31, the oil in the upper chamber, the oil in the lower chamber, and the spring assembly, so that the base of the main valve seat 2 and the bottom surface of the pressure chamber 13 abut to seal the sealing hole 131, and prevent 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 reset spring 10 and the oil in the upper chamber, so that the first spring 6 and the second spring 7 are in a compressed state, and the main valve seat 2 can be pressed against the bottom surface of the pressure chamber 13. At the same time, the first spring 6 can apply an elastic force to the auxiliary valve seat 31, so that the auxiliary valve seat 31 is pressed against the connecting section of the sleeve 32 to achieve the sealing of 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 inlet and outlet pressure difference 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 the oil pressure is less than the second set value and greater than or equal to 0, the oil flows into the receiving groove of the main valve seat 2 through the guide hole 132 of the pressure chamber 13 and the perforation of the main valve seat 2. When the upper surface of the oil contacts the lower surface of the sleeve 32, the oil flows to the space below the diaphragm 8 through the gap between the sleeve 32 and the main valve seat 2. In this way, the oil acts on the diaphragm 8, the sleeve 32 and the auxiliary valve seat 31, so that the sleeve 32 and the auxiliary valve seat 31 move toward the side away from the sealing hole 131. Since the inlet and outlet pressure difference is less than the second set value and greater than or equal to 0, the limit plate on the sleeve 32 does not abut against the stopper 4 after movement. At this time, the main valve seat 2 seals the sealing hole 131 under the joint 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 component 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 to 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 through the outer flow channel 9 to the upper chamber above the diaphragm 8, and the oil in the upper chamber flows through the guide groove to the first cylinder section of the sleeve 32. The oil in the first cylinder 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 powered off, the moving iron core 53 is no longer subjected to the magnetic effect of the coil 51. First, the main valve seat 2 moves toward the sealing hole 131 under the action of the reset spring 10, the auxiliary valve seat 31, the oil in the upper chamber, the oil in the lower chamber, and the spring assembly, so that the base of the main valve seat 2 and the bottom surface of the pressure chamber 13 abut to seal the sealing hole 131, and prevent 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 reset spring 10 and the oil in the upper chamber, so that the first spring 6 begins to compress and the second spring 7 is further compressed, so that the main valve seat 2 can be pressed against the bottom surface of the pressure chamber 13. At the same time, the first spring 6 can apply an elastic force to the auxiliary valve seat 31, so that the auxiliary valve seat 31 is pressed against the connecting section of the sleeve 32 to achieve the sealing of 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 inlet and outlet pressure difference of the solenoid valve is greater than the second set value and less than the first set value.

[0074] When the oil pressure is greater than the second set value and less than the first set value, the oil flows into the receiving groove of the main valve seat 2 through the guide hole 132 of the pressure chamber 13 and the perforation of the main valve seat 2. When the upper surface of the oil contacts the lower surface of the sleeve 32, the oil flows to the space below the diaphragm 8 through the gap between the sleeve 32 and the main valve seat 2. In this way, the oil acts on the diaphragm 8, the sleeve 32 and the auxiliary valve seat 31, so that the sleeve 32 and the auxiliary valve seat 31 move toward the side away from the sealing hole 131. Since it is greater than the second set value and less than the first set value, the limit plate on the sleeve 32 does not abut against the stopper 4 after movement. At this time, the main valve seat 2 seals the sealing hole 131 under the joint action of the oil pressure, the spring assembly, the auxiliary valve assembly 3 and the reset spring 10, the first spring 6 is in a free state, and the spring assembly and the reset spring 10 are in a balanced state. In this example, the working process of the electromagnetic drive assembly 5 after power on and off 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 electromagnetic valve is not pressurized, the electromagnetic 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, first, the main valve seat 2 moves toward the sealing hole 131 under the action of the reset spring 10, the auxiliary valve seat 31, the oil in the upper chamber, the oil in the lower chamber, and the spring assembly, so that the base of the main valve seat 2 and the bottom surface of the pressure chamber 13 abut to seal the sealing hole 131, 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 reset spring 10 and the oil in the upper chamber, so that the first spring 6 begins to compress and the second spring 7 is further compressed, so that the main valve seat 2 can be pressed against the bottom surface of the pressure chamber 13. At the same time, the first spring 6 can apply an elastic force to the auxiliary valve seat 31, so that the auxiliary valve seat 31 is pressed against the connecting section of the sleeve 32 to achieve the sealing of 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: 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: 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 failure of the reverse seal is: the main valve seat 2 is open or the auxiliary valve seat 31 is open.

[0080] The main valve seat 2 is opened 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, since the fuel pressure in the pressure chamber 13 in the embodiment of the present application is downward, the support force of the bottom surface of the pressure chamber 13 on the main valve seat 2 will always be greater than the initial spring force, so that the main valve seat 2 will not open. The auxiliary valve seat 31 is opened when the support force of the sleeve 32 on the auxiliary 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 the fuel pressure, when the fuel pressure gradually increases to the set value, the support force between the auxiliary valve seat 31 and the sleeve 32 is just equal to its sealing pressure. However, the actual situation is not the case. When the fuel pressure is applied, the sleeve 32 will move downward, that is, the sealing force is much greater than the preset sealing pressure. At this time, the sealing force consists of two parts, namely, 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, and at the same time, the fuel pressure area on the lower side of the auxiliary valve seat 31 is larger than the fuel pressure area on the upper side of the auxiliary valve seat 31, so that the auxiliary valve seat 31 is sealed reliably and will not open. Therefore, the solenoid valve in the embodiment of the present application can realize the function of reverse sealing.

[0081] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An internally balanced solenoid valve, characterized in that: It comprises a valve body, wherein the valve body 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 communicating with the outlet flow channel, and the side surface of the pressure chamber is provided with a guide hole communicating with the inlet flow channel; The valve body is also provided with a main valve seat, a secondary 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 comprises a bottom plate and a surrounding plate, the bottom plate corresponds to the sealing hole, the bottom plate and the surrounding plate are connected and enclose 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, and 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 receiving groove, and the other end is connected to the electromagnetic drive assembly. A stopper is provided on the side wall of the receiving groove. The stopper is arranged on a side of the auxiliary valve assembly away from the bottom plate and is limitedly matched 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 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 driving assembly. A limiting plate is arranged on the outer wall of the sleeve, and the limiting plate is limitedly matched with the blocking member 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, wherein 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, and 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 arranged 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 comprises an outer flow channel, one end of which is in communication with the outlet flow channel, and the other end of which is in communication 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 connected 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 the perforations are arranged on the annular enclosure plate, and the plurality of the perforations are evenly distributed along the circumference of the annular enclosure plate.

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