Pilot-operated solenoid valve and thermal management device

Abstract

The embodiment of the utility model provides a pilot-operated type electromagnetic valve and a heat management device, and relates to the technical field of heat management equipment. The pilot-operated type electromagnetic valve enables the plunger to move through energization control of the electromagnetic coil, so that the state that the main valve element abuts against the valve seat to cut off the inflow port and the outflow port and the state that the main valve element abuts against the limiting part to enable the inflow port and the outflow port to be communicated are achieved. The first spring is arranged on the outer side of the main valve element in a sleeving mode so as to drive the main valve element to move towards the plunger. The second spring is arranged on the plunger so as to drive the plunger to move towards the main valve element. The first spring, the inflow port and the outflow port are staggered. The problem that the upper end face of a piston spring is driven by the working medium to move towards an outflow port under the working conditions of large inlet and outlet pressure difference and large flow can be solved.

Description

Technical Field

[0001] The utility model relates to the field of thermal management equipment, and more particularly, to a pilot-operated solenoid valve, a thermal management device and a vehicle. Background Art

[0002] A solenoid valve controls the opening / closing of a valve by energizing a coil to generate a magnetic field. Since the larger the diameter, the greater the pressure generated under the same pressure difference, a direct-acting solenoid valve is generally only applicable to small-diameter working conditions. In working conditions that require large flow rates or large diameters, a pilot-operated structure is generally used.

[0003] The internal structure of a pilot-operated solenoid valve includes a pilot valve component and a main valve component. The main valve component includes parts such as a piston, a valve body, and a piston spring. The piston spring is to ensure that the piston can be smoothly opened under low inlet and outlet pressure difference conditions.

[0004] In the existing pilot-operated solenoid valve (such as CN108713118B), the piston spring is placed between the fluid inlet and outlet of the solenoid valve, which will affect the flow of the working medium, and under large inlet and outlet pressure differences and large flow rate conditions, the piston spring will be driven by the working medium towards the fluid outlet direction, and there is a risk that the upper end surface of the spring may be disengaged from the upper contact surface of the piston, resulting in the spring being stuck and unable to work properly. Summary of the Utility Model

[0005] The purpose of the present utility model includes, for example, providing a pilot-operated solenoid valve and a thermal management device, which can improve the influence of the spring on the flow of the working medium and avoid the problem that the piston spring is driven by the working medium towards the fluid outlet direction and the upper end surface of the spring moves under large inlet and outlet pressure differences and large flow rate conditions.

[0006] The embodiments of the present utility model can be implemented as follows:

[0007] In a first aspect, the present utility model provides a pilot-operated solenoid valve, comprising:

[0008] A valve body having a valve chamber, a fluid inlet, a fluid outlet, a valve seat and a limiting portion;

[0009] A plunger movably disposed within the valve body, with a pilot valve core provided at an end of the plunger;

[0010] A main valve core movably disposed within the valve chamber between the plunger and the valve seat;

[0011] A pilot chamber formed between the main valve core and the plunger;

[0012] A pilot hole is formed in the main spool valve and is opened and closed by the pilot spool valve to selectively connect or cut off the pilot chamber from the fluid outlet.

[0013] A pressure equalizing hole is formed in the main spool valve to communicate the pilot chamber with the valve chamber.

[0014] An electromagnetic coil is provided outside the valve body. By controlling the energization of the electromagnetic coil, the plunger is moved, so as to achieve the state in which the main spool valve abuts against the valve seat to cut off the fluid inlet and the fluid outlet, and the state in which the main spool valve abuts against the limiting portion to connect the fluid inlet and the fluid outlet.

[0015] A first spring is sleeved outside the main spool valve to drive the main spool valve to move towards the plunger; and

[0016] A second spring is provided on the plunger to drive the plunger to move towards the main spool valve.

[0017] The first spring is arranged offset from the fluid inlet and the fluid outlet.

[0018] In an alternative embodiment, the fluid inlet is provided on the side wall of the valve body, and the fluid outlet is provided at the end of the valve body.

[0019] A first abutting platform is provided on the side wall of the valve chamber, and the abutting platform is located on the side of the fluid inlet away from the fluid outlet.

[0020] One end of the first spring abuts against the first abutting platform, and the other end abuts against the main spool valve.

[0021] In an alternative embodiment, the main spool valve is provided with a second abutting platform;

[0022] The second abutting platform is located on the side of the first abutting platform away from the fluid inlet and is spaced apart from the first abutting platform;

[0023] One end of the first spring abuts against the first abutting platform, and the other end abuts against the second abutting platform.

[0024] In an alternative embodiment, the second spring is sleeved outside the plunger, with one end abutting against the plunger and the other end abutting against the valve body.

[0025] In an alternative embodiment, the valve body includes a valve portion, a mounting platform, a guide sleeve and a yoke;

[0026] The valve chamber, the fluid inlet, the fluid outlet and the valve seat are provided in the valve portion;

[0027] The limiting part is arranged on the mounting table;

[0028] The mounting table is arranged on the valve part, the guiding sleeve is arranged on the mounting table, the yoke is arranged in the guiding sleeve, the electromagnetic coil is arranged outside the guiding sleeve and corresponds to the yoke and the injection molding;

[0029] A valve chamber is formed between the valve seat and the limiting part;

[0030] Part of the plunger is installed in the sleeve, and part of it extends into the valve chamber through the mounting table;

[0031] The second spring is sleeved on the part of the plunger extending into the valve chamber, and one end of the second spring abuts against the plunger, and the other end abuts against the limiting part.

[0032] In an alternative embodiment, a third abutting platform is arranged at one end of the plunger extending into the valve chamber, one end of the second spring abuts against the third abutting platform, and the other end abuts against the limiting part.

[0033] In an alternative embodiment, a limiting ring platform protrudes from one side of the limiting part close to the valve chamber;

[0034] The limiting ring platform is arranged on the outer peripheral edge of the second spring.

[0035] In an alternative embodiment, at least one balance flow channel is arranged along the axial direction of the plunger on the peripheral edge of the plunger.

[0036] In an alternative embodiment, a plurality of convex platforms are arranged at intervals on the outer peripheral edge of the main valve core near the lower end, a flow channel is formed between adjacent convex platforms, and the outer peripheral edge of the convex platform is matched with the inner peripheral edge of the first abutting platform.

[0037] In a second aspect, the present utility model provides a thermal management device, including the pilot-operated solenoid valve according to any one of the foregoing embodiments.

[0038] The beneficial effects of the pilot-operated solenoid valve and the thermal management device provided by the embodiments of the present utility model include, for example:

[0039] In the present application, the first spring that drives the main valve core to move towards the plunger direction is arranged in a dislocation manner with the fluid inlet and the fluid outlet, so that the first spring will not block the flow of the working medium between the fluid inlet and the fluid outlet. Secondly, arranging the first spring in this way can avoid the problem that the first spring will be driven by the working medium towards the fluid outlet direction under the conditions of large pressure difference and large flow rate between the fluid inlet and the fluid outlet, thereby avoiding the problem of the movement of the upper end surface of the first spring, so as to solve the risk of the separation of the contact surface between the first spring and the main valve core, and thus improve or solve the problem that the first spring is stuck and cannot work normally. Description of the Drawings

[0040] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0041] Figure 1 Schematic structural diagram of the pilot-operated solenoid valve provided by the embodiment of the present utility model;

[0042] Figure 2 Schematic cross-sectional structural diagram of the pilot-operated solenoid valve provided by the embodiment of the present utility model;

[0043] Figure 3 Schematic structural diagram of the valve part of the pilot-operated solenoid valve provided by the embodiment of the present utility model;

[0044] Figure 4 Schematic structural diagram of the main spool of the pilot-operated solenoid valve provided by the embodiment of the present utility model;

[0045] Figure 5 Schematic structural diagram of the plunger of the pilot-operated solenoid valve provided by the embodiment of the present utility model.

[0046] Icons: 100 - Pilot-operated solenoid valve; 110 - Valve body; 111 - Valve chamber; 112 - Inlet; 113 - Outlet; 114 - Valve seat; 115 - Limiting part; 116 - First abutting platform; 117 - Valve part; 118 - Mounting platform; 119 - Mounting hole; 121 - Guide sleeve; 123 - Yoke; 124 - Limiting ring platform; 125 - Balanced flow channel; 130 - Plunger; 131 - Third abutting platform; 150 - Main spool; 151 - Pilot hole; 152 - Pressure equalizing hole; 153 - Second abutting platform; 155 - Boss; 157 - Flow channel; 171 - Pilot chamber; 177 - Electromagnetic coil; 179 - First spring; 181 - Second spring. Specific embodiments

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0049] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0050] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present invention is habitually placed during use. This is 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 orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0051] In addition, if terms such as "first", "second", etc. are used only for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0052] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0053] Embodiment

[0054] Please refer to Figure 1 , this embodiment provides a thermal management device, which can be applied to an automobile to form vehicle air conditioning and / or battery pack thermal management.

[0055] Generally, a thermal management device at least includes a compressor, an evaporator, a condenser, an expansion valve, and a pilot-operated solenoid valve 100, which are connected to each other through pipes to form a refrigerant medium circulation flow path to achieve refrigerant circuit thermal management.

[0056] Of course, the thermal management device may further include a four-way valve, which is connected to the intake port and the exhaust port of the compressor to adjust the flow direction of the circulating working medium according to the refrigeration or heating demand.

[0057] It should be noted that the thermal management device provided in this embodiment can also be applied to other thermal management devices, such as air conditioners, refrigeration devices, heat pump devices, etc.

[0058] In the existing pilot-operated solenoid valve 100, the spring is arranged between the fluid inlet 112 and the fluid outlet 113, which will affect the flow of the working fluid. And under the conditions of large inlet and outlet pressure differences and large flow rates, the spring will be driven by the working fluid towards the fluid outlet 113, resulting in the risk that the upper end surface of the spring may be separated from the contact surface of the valve core, causing the spring to be stuck and unable to work properly.

[0059] Please refer to Figure 1 and Figure 2 To solve the above technical problems, the pilot-operated solenoid valve 100 of this embodiment includes a valve body 110, a plunger 130, a main valve core 150, a pilot chamber 171, a pilot hole 151, an equalizing hole 152, an electromagnetic coil 177, a first spring 179, and a second spring 181. The valve body 110 has a valve chamber 111, a fluid inlet 112, a fluid outlet 113, a valve seat 114, and a limiting portion 115. The plunger 130 is movably arranged inside the valve body 110, and a pilot valve core is arranged at the end of the plunger 130. The main valve core 150 is movably disposed in the valve chamber 111 between the plunger 130 and the valve seat 114. The pilot chamber 171 is formed between the main valve core 150 and the plunger 130. The pilot hole 151 is formed in the main valve core 150 and is opened and closed by the pilot valve core to selectively connect or cut off the pilot chamber 171 from the fluid outlet 113. The equalizing hole 152 is formed in the main valve core 150 and connects the pilot chamber 171 with the valve chamber 111. The electromagnetic coil 177 is arranged outside the valve body 110, and the movement of the plunger 130 is controlled by energizing the electromagnetic coil 177, so as to achieve the state where the main valve core 150 abuts against the valve seat 114 to cut off between the fluid inlet 112 and the fluid outlet 113, and the state where the main valve core 150 abuts against the limiting portion 115 to connect between the fluid inlet 112 and the fluid outlet 113. The first spring 179 is sleeved outside the main valve core 150 to drive the main valve core 150 to move towards the plunger 130. The second spring 181 is arranged on the plunger 130 to drive the plunger 130 to move towards the main valve core 150. The first spring 179 is arranged in a dislocation manner with respect to the fluid inlet 112 and the fluid outlet 113.

[0060] In this embodiment, by arranging the first spring 179 that drives the main valve core 150 to move towards the plunger 130 in a dislocation manner with respect to the fluid inlet 112 and the fluid outlet 113, the first spring 179 will not block the flow of the working fluid between the fluid inlet 112 and the fluid outlet 113. Secondly, arranging the first spring 179 in this way can avoid the problem that the first spring 179 will be driven by the working fluid towards the fluid outlet 113 under the conditions of large pressure differences between the fluid inlet 112 and the fluid outlet 113 and large flow rates, thereby avoiding the problem of the movement of the upper end surface of the first spring 179, so as to solve the risk of the separation of the contact surface between the first spring 179 and the main valve core 150, and thus improve or solve the problem that the first spring 179 is stuck and unable to work properly.

[0061] Please refer toFigure 2 , Figure 3 and Figure 4 , in this embodiment, the fluid inlet 112 is arranged on the side wall of the valve body 110, and the fluid outlet 113 is arranged at the end of the valve body 110. That is, the liquid inlet is arranged above the liquid outlet. A first abutting platform 116 is arranged on the side wall of the valve chamber 111, and the first abutting platform 116 is located on the side of the fluid inlet 112 away from the fluid outlet 113. That is, the first abutting platform 116 is arranged at a position above the liquid inlet. One end of the first spring 179 abuts against the first abutting platform 116, and the other end abuts against the main valve core 150.

[0062] In this embodiment, the first abutting platform 116 is arranged on the side of the fluid inlet 112 away from the fluid outlet 113, so that the working medium flowing in from the fluid inlet 112 will not impact the first spring 179, and the first spring 179 will not block the flow of the working medium. Most importantly, when the working medium flows from the fluid inlet 112 towards the fluid outlet 113, it will not impact the first spring 179, so there is no problem that the working medium drives the first spring 179 to move towards the fluid outlet 113 direction, thus solving the problem that the first spring 179 is disengaged from the abutment with the main valve core 150 and avoiding the end of the first spring 179 being stuck in the gap between the main valve core 150 and the valve body 110.

[0063] Please refer to Figure 2 , Figure 3 and Figure 4 , in this embodiment, the main valve core 150 is provided with a second abutting platform 153. The second abutting platform 153 is located on the side of the first abutting platform 116 away from the fluid inlet 112 and is arranged at an interval from the first abutting platform 116. One end of the first spring 179 abuts against the first abutting platform 116, and the other end abuts against the second abutting platform 153.

[0064] In this embodiment, the second abutting platform 153 is arranged on the side of the first abutting platform 116 away from the fluid outlet 113, so that the first spring 179 abuts between the first abutting platform 116 and the second abutting platform 153, thereby using the first spring 179 to push the main valve core 150 towards the direction of the plunger 130.

[0065] In this embodiment, the main spool valve 150 includes a lower part and an upper part with different diameters. The upper part and the lower part are connected, and the outer peripheral edge of the upper part cooperates with the side wall of the valve chamber 111 to guide the main spool valve 150 to move along the valve chamber 111. A second abutting platform 153 is formed at the lower end of the upper part. The first spring 179 is sleeved on the lower part, its upper end abuts against the end face of the second abutting platform 153 formed by the upper part, and its lower end abuts against the first abutting platform 116. The inner ring of the first abutting platform 116 cooperates with the lower part. The outer peripheral edge of the upper part cooperates with the side wall of the valve chamber 111, and the outer peripheral edge of the lower part cooperates with the inner ring of the first abutting platform 116. This is mainly to prevent the lower end of the first spring 179 from detaching from the first abutting platform 116 and falling into the inner ring of the first abutting platform 116 in case of an accident. During the movement of the main spool valve 150 towards the plunger 130, the outer peripheral edge of the lower part can make the lower end of the first spring 179 return to the first abutting platform 116 again.

[0066] In this embodiment, a plurality of bosses 155 are arranged at intervals on the outer peripheral edge of the lower part of the main spool valve 150. A flow channel 157 is formed between adjacent bosses 155. The outer peripheral edge of the boss 155 cooperates with the inner peripheral edge of the first abutting platform 116. The flow channel 157 can communicate the inlet with the pressure equalizing hole 152, so as to better achieve pressure equalization.

[0067] Please refer to Figure 2 、 Figure 3 and Figure 4, in this embodiment, the valve body 110 includes a valve portion 117, a mounting table 118, a guide sleeve 121, and a yoke 123. A valve chamber 111, an inlet port 112, an outlet port 113, and a valve seat 114 are provided in the valve portion 117. In one achievable manner, the valve portion 117 is generally formed in a cylindrical shape, with the bottom end forming the outlet port 113 and multiple inlet ports formed on the side wall. The valve seat 114 is provided corresponding to the outlet port 113, and the valve chamber 111 is formed above the valve seat 114. The main valve core 150 is movably arranged in the valve chamber 111, and when it moves to the lowermost end, it will abut against the valve seat 114, thereby blocking the communication between the inlet port 112 and the outlet port 113. The first abutting table 116 is also provided on the valve portion 117, which is an annular table. The mounting table 118 is mounted on the upper opening of the valve portion 117, and is generally connected to the upper opening of the valve portion 117 by threads. The limiting portion 115 is provided on the mounting table 118, and when the main valve core 150 moves to the uppermost end, it will abut against the limiting portion 115. The valve chamber 111 is formed between the valve seat 114 and the limiting portion 115. The mounting table 118 is provided with a mounting hole 119, and the guide sleeve 121 is mounted on the mounting table 118 through the mounting hole 119. The yoke 123 is arranged inside the guide sleeve 121, and the electromagnetic coil 177 is arranged outside the sleeve and corresponds to the yoke 123. The plunger 130 is partially installed inside the sleeve and partially extends into the valve chamber 111 through the mounting hole 119 provided on the mounting table 118 to act on the main valve core 150. In this way, when the electromagnetic coil 177 is energized or de-energized, under the combined action of the yoke 123, the plunger 130, the first spring 179, and the second spring 181, the main valve core 150 is actuated.

[0068] Please refer to Figure 2 , Figure 3 and Figure 5 , in this embodiment, the second spring 181 is sleeved outside the plunger 130, with one end abutting against the plunger 130 and the other end abutting against the valve body 110, so as to conveniently push the plunger 130 to move downward.

[0069] In this embodiment, the second spring 181 is sleeved on the part of the plunger 130 extending into the valve chamber 111, and one end of the second spring 181 abuts against the plunger 130 and the other end abuts against the limiting portion 115.

[0070] Specifically, one end of the plunger 130 extending into the valve chamber 111 is provided with a third abutting table 131, one end of the second spring 181 abuts against the third abutting table 131, and the other end abuts against the limiting portion 115. In this way, the second spring 181 can be conveniently installed, and since the second spring 181 is sleeved outside the plunger 130, it will not bend after being stressed, thereby avoiding jamming.

[0071] Please refer to Figure 2 , Figure 3 and Figure 4, in this embodiment, the diameter of the mounting hole 119 provided on the mounting table 118 matches the diameter of the plunger 130. During installation, first, the second spring 181 is sleeved on the plunger 130 so that the lower end of the second spring 181 abuts against the third abutting platform 131. Then, the upper end of the plunger 130 is inserted into the guide sleeve 121 through the mounting hole 119, and then the mounting table 118 is installed on the upper side opening of the valve portion 117, so that the lower end of the second spring 181 can abut against the third abutting platform 131 and also abut against the limiting portion 115. Compared with the prior art where the second spring 181 is arranged between the yoke 123 and the plunger 130, the second spring 181 is more stable.

[0072] In this embodiment, a limiting ring platform 124 protrudes from the side of the limiting portion 115 close to the valve chamber 111. The limiting ring platform 124 is arranged on the outer peripheral edge of the second spring 181. This can limit the upper end of the second spring 181 and make its operation more stable.

[0073] In this embodiment, at least one balance flow channel 125 is arranged along the axial direction of the plunger 130 on the periphery of the plunger 130. The lower end of the balance flow channel 125 is communicated with the pilot chamber 171, and the upper end is communicated with the space between the yoke 123 and the end of the plunger 130. In this way, it is easier to manufacture compared with the prior art where an opening is made in the middle.

[0074] The specific working process is as follows. Taking the pilot-operated solenoid valve 100 as a normally closed type as an example, the operation of the solenoid valve will be described. In the state where the electromagnetic coil 177 is not energized, the plunger 130 descends under the action of its own gravity and the force applied by the second spring 181, and overcomes the elastic force of the lower first spring 179 to press down the main valve core 150 so that the end face on the lower side of the main valve core 150 abuts against the valve seat 114. In addition, in the above state, the pilot valve core of the plunger 130 blocks the upper end of the pilot hole 151 of the main valve core 150. Therefore, the pilot chamber 171 and the outlet 113 are cut off. This is the closed state of the solenoid valve.

[0075] If the electromagnetic coil 177 is energized in the above state, the plunger 130 rises under the action of the electromagnetic force and overcomes the elastic force of the second spring 181. As a result, the pilot valve core leaves the pilot hole 151 of the main valve core 150 to open the upper end of the pilot hole 151. Therefore, the pilot chamber 171 and the outlet 113 are communicated. When the pilot hole 151 is opened, the main valve core 150 will rise under the action of the pressure difference between the upper and lower sides of the main valve core 150 (the pressure difference between the pilot chamber 171 and the valve chamber 111) and the force applied by the first spring 179. In this way, the main valve core 150 is separated from the valve seat 114 so that the inlet 112 and the outlet 113 are communicated. Thus, the working medium flows in the path of the inlet 112, the valve chamber 111, and the outlet 113.

[0076] In summary, the working principles and beneficial effects of the pilot-operated solenoid valve 100 and the thermal management device provided by the embodiments of the present utility model include:

[0077] In this embodiment, the first spring 179 that drives the main spool 150 to move towards the plunger 130 is arranged offset from the fluid inlet 112 and the fluid outlet 113, so that the first spring 179 does not block the flow of the working fluid between the fluid inlet 112 and the fluid outlet 113. Secondly, arranging the first spring 179 in this way can avoid the problem that the first spring 179 is driven by the working fluid towards the fluid outlet 113 under the conditions of large pressure difference and large flow rate between the fluid inlet 112 and the fluid outlet 113, thereby avoiding the problem of the upper end surface of the first spring 179 moving, so as to solve the risk of the contact surface between the first spring 179 and the main spool 150 detaching, and thus improve or solve the problem that the first spring 179 is stuck and cannot work properly.

[0078] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A pilot-operated solenoid valve, characterized in that: include: A valve body, the valve body comprising a valve chamber, an inlet, an outlet, a valve seat and a limit portion; A plunger, the plunger is movably arranged in the valve body, and a pilot valve core is arranged at the end of the plunger; a main valve core, the main valve core is movably arranged in the valve chamber between the plunger and the valve seat; a pilot chamber formed between the main valve core and the plunger; a pilot hole, the pilot hole being formed in the main valve core and opened and closed by the pilot valve core to selectively connect or cut off the pilot chamber and the outflow port; a pressure equalizing hole, which is formed in the main valve core and enables the pilot chamber to communicate with the valve chamber; An electromagnetic coil is arranged outside the valve body, and the plunger is moved by controlling the power supply to the electromagnetic coil, so as to realize a state in which the main valve core abuts against the valve seat to cut off the inlet and the outlet, and a state in which the main valve core abuts against the limiter to connect the inlet and the outlet; A first spring, wherein the first spring is sleeved on the outside of the main valve core to drive the main valve core to move toward the plunger; as well as, a second spring, the second spring being arranged on the plunger to drive the plunger to move toward the main valve core; The first spring is disposed offset from the inlet and the outlet.

2. The pilot-operated solenoid valve according to claim 1, characterized in that: The inlet is arranged on the side wall of the valve body, and the outlet is arranged on the end of the valve body; A first abutment platform is disposed on the side wall of the valve chamber, and the first abutment platform is located on a side of the inlet away from the outlet; One end of the first spring abuts against the first abutment platform, and the other end of the first spring abuts against the main valve core.

3. The pilot-operated solenoid valve according to claim 2, characterized in that: The main valve core is provided with a second abutment platform; The second abutment platform is located on a side of the first abutment platform away from the inlet, and is spaced apart from the first abutment platform; One end of the first spring abuts against the first abutting platform, and the other end of the first spring abuts against the second abutting platform.

4. The pilot-operated solenoid valve according to any one of claims 1 to 3, characterized in that: The second spring is sleeved on the outside of the plunger, one end of the second spring abuts against the plunger, and the other end abuts against the valve body.

5. The pilot-operated solenoid valve according to claim 4, characterized in that: The valve body comprises a valve portion, a mounting platform, a guide sleeve and a yoke; The valve chamber, the inlet, the outlet and the valve seat are arranged on the valve portion; The limiting portion is arranged on the mounting platform; The mounting platform is arranged on the valve part, the guide sleeve is arranged on the mounting platform, the yoke is arranged inside the guide sleeve, and the electromagnetic coil is arranged outside the guide sleeve and corresponds to the yoke and the plunger; The valve chamber is formed between the valve seat and the limiting portion; The plunger is partially installed in the sleeve and partially extends into the valve chamber through the mounting platform; The second spring is sleeved on the portion of the plunger extending into the valve chamber, and one end of the second spring abuts against the plunger, and the other end abuts against the limiting portion.

6. The pilot-operated solenoid valve according to claim 5, characterized in that: A third abutment is disposed at one end of the plunger extending into the valve chamber, one end of the second spring abuts against the third abutment, and the other end of the second spring abuts against the limiting portion.

7. The pilot-operated solenoid valve according to claim 5, characterized in that: A limiting ring platform is convexly provided on one side of the limiting portion close to the valve chamber; The limiting ring is arranged on the outer periphery of the second spring.

8. The pilot-operated solenoid valve according to claim 5, characterized in that: The periphery of the plunger is provided with at least one balancing flow channel along the axial direction of the plunger.

9. The pilot-operated solenoid valve according to any one of claims 2 to 3, characterized in that: A plurality of bosses are arranged at intervals on the outer periphery of the main valve core near the lower end, and flow channels are formed between adjacent bosses. The outer periphery of the bosses cooperates with the inner periphery of the first abutting platform.

10. A thermal management device, characterized in that: It comprises the pilot solenoid valve according to any one of claims 1 to 8.

Images