Multifunctional electromagnetic valve

Abstract

The utility model relates to the technical field of automobile air conditioning systems, and discloses a multifunctional electromagnetic valve which comprises a valve body, a valve seat and a valve element which can move in the axial direction are arranged in the valve body, a first valve port is formed between the valve element and the valve seat, a second valve port is formed between the valve seat and the valve body, and the flow of the first valve port is smaller than that of the second valve port. A detection mechanism for detecting the opening degree of the first valve port is arranged on the valve body; the electromagnetic valve is provided with two flow valve ports, when one small-flow valve port is used for the refrigeration working condition of an air conditioning system and the other large-flow valve port is used for the heating working condition of the system, refrigerants are directly introduced into an evaporator without throttling, parallel pipelines and switch valves of the air conditioning system are reduced, and the cost is reduced. The cost of the air-conditioning system is greatly reduced; the leakage at the pipeline joint is reduced; and meanwhile, the opening degree of the first valve port is compared with an air conditioner system instruction through the detection mechanism and corrected, and precise closed-loop control over the opening degree of the valve ports is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile air conditioning system, concretely relates to a multifunctional electromagnetic valve. BACKGROUND

[0002] The electromagnetic valve in the fluid system is to adjust the flow of fluid by changing its working state, thereby affecting the operation of the whole system, and its basic principle is to control the opening and closing of the valve by using the action of electromagnetic force; when the coil is powered, a magnetic field is generated, and the magnetic field force acts on the valve core to overcome the spring force or other resistance, so that the valve core moves, thereby changing the passage state of the valve and realizing the conduction, cut-off or flow control of the fluid passage.

[0003] In the existing new energy automobile air conditioning system, due to the adoption of the heat pump function, an electronic expansion valve with a separate throttling function and a parallel bypass valve are generally installed in the front section of the evaporator and the heat exchanger, which functions to meet the different flow requirements of the evaporator and the heat exchanger when the air conditioning system switches between the refrigeration and heating functions, but the structure of the pipeline is complex, the interface is multiple, and the risk of leakage is large. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the defects in the prior art, providing a multifunctional electromagnetic valve, which can realize the functions of system refrigeration and heating in two working conditions on one valve, simplify the pipeline structure, and realize accurate closed-loop control of the valve opening degree.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] A multifunctional electromagnetic valve, comprising a valve body, the inside of the valve body is provided with a valve seat and a valve core which can move in the axial direction, the valve core and the valve seat have a first valve port therebetween, the valve seat and the valve body have a second valve port therebetween, the flow of the first valve port is smaller than the flow of the second valve port, and a detection mechanism for detecting the opening degree of the first valve port is arranged on the valve body.

[0007] Optionally, the upper and lower ends of the valve body are respectively provided with a valve cover and a plug, the valve cover and the valve seat have a first cavity therebetween, the plug and the valve seat have a second cavity therebetween, and an inlet and an outlet are further formed in the valve body; the inlet is communicated with the first cavity, the outlet is communicated with the second cavity, the first cavity and the second cavity are communicated through the first valve port, and the inlet and the second cavity are communicated through the second valve port.

[0008] Optionally, a center hole for communicating the first cavity and the second cavity is formed at the center position of the valve seat, and a through hole for communicating the inlet and the first cavity is formed on the periphery of the center hole.

[0009] Optionally, a balance spring is arranged between the valve seat and the valve cover, and a main spring is arranged between the valve seat and the plug.

[0010] Optionally, a guide sleeve is arranged above the valve cover, a fixed iron core is fixedly installed on the inner side of the guide sleeve, and a coil assembly is arranged on the outer side of the guide sleeve; a movable iron core is slidably installed above the fixed iron core, a valve rod is fixedly installed on the movable iron core, and one end of the valve rod penetrates through the fixed iron core and abuts against the end of the valve core.

[0011] Optionally, a third cavity is arranged between the valve cover and the fixed iron core, the upper portion of the valve core is embedded into the third cavity through the valve cover, and a core hole for connecting the first cavity and the third cavity is arranged at the central position of the valve core.

[0012] Optionally, the detection mechanism comprises a magnet seat, the magnet seat is fixedly connected to one end of the movable iron core away from the fixed iron core, a permanent magnet is arranged on the magnet seat, and a control circuit assembly capable of detecting the action displacement of the permanent magnet is arranged above the magnet seat.

[0013] Optionally, a reset spring is arranged between the upper portion of the valve core and the valve cover, and a limiting spring is arranged between the movable iron core and the guide sleeve, and the limiting spring is coaxial with the guide sleeve.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] (1) the electromagnetic valve in the utility model is provided with two flow valve ports, one small flow valve port is used for air conditioning system refrigeration working condition, and the other large flow valve port is used for directly introducing refrigerant into the evaporator without throttling when the system is in heating working condition, thereby reducing the parallel pipeline and switch valve of the air conditioning system, greatly reducing the cost of the air conditioning system and reducing the leakage at the pipeline connection place; meanwhile, the opening degree of the first valve port is compared with the air conditioning system instruction through the detection mechanism and is corrected, so that the accurate closed loop control of the valve port opening degree is realized.

[0016] (2) the valve core, the valve rod, the movable iron core and the permanent magnet in the utility model can be synchronously displaced, so that the control circuit assembly only needs to detect the displacement of the permanent magnet, so that the displacement of the valve core can be known, the opening degree of the first valve port can be known, and the flow control precision of the electromagnetic valve is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structure schematic view of the multifunctional electromagnetic valve (in the small valve port throttling state) in the utility model embodiment;

[0018] Figure 2is the structural schematic view of the multifunctional electromagnetic valve (in the large valve port full open state) in the embodiment of the utility model;

[0019] Figure 3 is the structural schematic view of the first valve port (small valve port) in the embodiment of the utility model;

[0020] Wherein, 1, valve body;101, import;102, export;2, valve seat;201, center hole;202, through hole;3, valve cover;4, block;5, valve core;501, core hole;6, baffle ring;7, reset spring;8, main spring;9, shell;10, guide sleeve;11, coil assembly;12, fixed iron core;13, moving iron core;14, valve rod;15, limit spring;16, junction box;17, magnet seat;18, permanent magnet;19, control circuit assembly;20, third cavity;21, balance spring. DETAILED DESCRIPTION

[0021] The utility model will be explained further in detail in combination with the drawings and embodiment, these drawings are all simplified schematic view, only with the schematic way the basic structure of the utility model is explained, therefore it only shows the constitution related with the utility model.

[0022] Embodiment one, as shown in Figure 1 , Figure 2 and Figure 3 A kind of multifunctional electromagnetic valve, including valve body 1, the inside of valve body 1 is provided with the valve seat 2 and valve core 5 that can move along the axial direction, there is the first valve port between valve core 5 and valve seat 2, there is the second valve port between valve seat 2 and valve body 1;Because the flow of first valve port is less than the flow of second valve port, so first valve port is small valve port here, and second valve port is large valve port.

[0023] Wherein, first valve port is in the initial state under the open state, valve core 5 is driven from the valve rod 14 in the upper side to gradually reduce the opening of first valve port, until first valve port is closed, and valve rod 14 is driven to move up and down along the axial direction by electromagnetic drive device, and valve body 1 is provided with detection mechanism for detecting the opening of first valve port.

[0024] The electromagnetic valve is provided with two flow valve ports (i.e. first valve port and second valve port located at upper and lower ends of valve seat 2), one small flow valve port is used for air conditioning system refrigeration working condition, and the other large flow valve port is used for directly introducing refrigerant into evaporator without throttling when system is in heating working condition, which reduces the parallel pipeline and switch valve of air conditioning system, greatly reduces the cost of air conditioning system and reduces the leakage of pipeline connection. Meanwhile, the opening of first valve port is compared with the instruction of air conditioning system and is corrected by detection mechanism, to realize the accurate closed-loop control of valve port opening.

[0025] The valve body 1 is internally provided with a flow channel, and the valve body 1 is provided with an inlet 101 and an outlet 102, which are perpendicular to the axis of the flow channel; the upper and lower ends of the flow channel are respectively fixedly provided with a valve cover 3 and a plug 4, and the valve cover 3 and the valve seat 2 have a first cavity, and the plug 4 and the valve seat 2 have a second cavity.

[0026] Specifically, the inlet 101 is communicated with the first cavity, the outlet 102 is communicated with the second cavity, the first cavity and the second cavity are communicated through a first valve port, and the inlet 101 and the second cavity are communicated through a second valve port; the valve seat 2 is provided with a central hole 201 at the center position for communicating the first cavity and the second cavity, and the peripheral side of the central hole 201 is provided with a through hole 202 for communicating the inlet 101 and the first cavity.

[0027] The air conditioner refrigerant enters from the inlet 101 of the valve body 1, passes through the through hole 202 of the valve seat 2 into the first cavity, then passes through the first valve port to the second cavity along the central hole 201, and finally flows out through the outlet 102.

[0028] The bottom of the valve seat 2 is provided with a sealing element, and the sealing element and the valve body 1 form a second valve port, and the cross section of the second valve port is consistent with the cross section of the inlet pipeline. The second valve port adopts a linear sealing form of taper and round angle contact, that is, the upper end of the central hole 201 is a tapered surface, the lower end of the valve core 5 is provided with a round angle on the outer side, and the size of the taper of the valve core 5 is related to the curve requirement of the flow opening.

[0029] Further, the valve seat 2 and the valve cover 3 are provided with a balance spring 21, and the valve seat 2 and the plug 4 are provided with a main spring 8.

[0030] The small valve port at the upper end of the valve seat 2 is used for normal flow control, and the large valve port at the lower end is used for large flow conduction; during work, the valve core 5 is driven to move downward to close the first valve port, and the valve seat 2 is pushed to move downward to close the second valve port, then the valve rod 14 moves upward to gradually open the first valve port, and adjusts the appropriate valve opening according to the system requirement; at this time, since the pressure at the upper and lower ends of the valve seat 2 is very different, the valve seat 2 is pressed at the lower end, the second valve port is in a closed state, and the electromagnetic valve is in a proportional throttling working state.

[0031] After the valve rod 14 is reset, the flow of the first valve port increases, which causes the pressure at the upper end of the valve seat 2 to decrease, and when the sum of the air pressure at the upper end of the valve seat 2 (i.e. in the first cavity) and the elastic force of the balance spring 21 is less than the sum of the air pressure at the lower end of the valve seat 2 (i.e. in the second cavity) and the elastic force of the main spring 8, the main spring 8 overcomes the pressure at the upper end of the valve seat 2 and the elastic force of the balance spring 21 to open the second valve port upward.

[0032] In the embodiment two, the valve core 5 is provided with a plurality of valve ports, and the valve seat 2 is provided with a plurality of central holes 201 corresponding to the valve ports. Figure 1 and Figure 2As shown, on the basis of the embodiment one, the utility model still proposes the specific structure of electromagnetic drive device for driving the up and down movement of valve rod 14.

[0033] The electromagnetic drive device comprises a shell 9 fixedly installed on one end of the valve body 1 close to the valve cover 3, and a guide sleeve 10 fixedly installed inside the shell 9, wherein one end of the guide sleeve 10 is open, the other end is closed and invertedly buckled above the valve cover 3, that is, the open end is close to the valve cover 3; a fixed iron core 12 is fixedly installed on the inner side of the guide sleeve 10, and a coil assembly 11 is arranged on the outer side of the guide sleeve 10, that is, the coil assembly 11 is located between the guide sleeve 10 and the shell 9.

[0034] A movable iron core 13 is slidingly installed on the inner side of the guide sleeve 10, and the movable iron core 13 is located above the fixed iron core 12; one end of the valve rod 14 is fixedly connected with the movable iron core 13, and the other end penetrates through the fixed iron core 12 and abuts against the end of the valve core 5.

[0035] The valve cover 3 and the fixed iron core 12 have a third cavity 20, the upper part of the valve core 5 penetrates through the valve cover 3 and is embedded in the third cavity 20, a reset spring 7 is arranged between the upper part of the valve core 5 and the valve cover 3, a limiting spring 15 is arranged between the movable iron core 13 and the guide sleeve 10, and the limiting spring 15 is coaxial with the guide sleeve 10.

[0036] The reset spring 7 and the limiting spring 15 form a stable elastic mechanism; a retaining ring 6 is further arranged on the upper end of the valve cover 3, the retaining ring 6 is sleeved on the outer side of the valve core 5, and the bottom of the retaining ring 6 is provided with a sealing ring, so as to ensure the sealing between the first cavity and the third cavity 20 and prevent the impurities in the refrigerant from entering the gap between the valve rod 14 and the third cavity 20 and causing the risk of jamming.

[0037] When the coil assembly 11 is powered off, under the elastic force of the reset spring 7, the upper end of the valve core 5 is in contact with the top surface in the third cavity 20, so that the first valve port is opened, and the valve rod 14 is pushed to the upper end position, so that the movable iron core 13 is away from the fixed iron core 12, and the limiting spring 15 is compressed and shrunk to generate elastic potential energy.

[0038] When the coil assembly 11 is powered on, an electromagnetic force is generated, and the size of the electromagnetic force is proportional to the strength of the current signal; the electromagnetic force pushes the movable iron core 13 to move downward and close to the fixed iron core 12, and the movable iron core 13 drives the valve rod 14 to move downward at the same time, the lower end of the valve rod 14 is in contact with the valve core 5, the flange end of the valve core 5 (that is, the upper part of the valve core 5) has the reset spring 7 below to prevent the valve rod 14 from moving downward, and the size of the electromagnetic force and the reaction force of the reset spring 7 are balanced to generate a downward displacement, so as to change the passage area of the first valve port.

[0039] In order to balance the force of the air pressure at the inlet 101 on the valve core 5, a core hole 501 is provided at the center of the valve core 5 to connect the first cavity and the third cavity 20. That is, the first cavity and the third cavity 20 are connected through the core hole 501, so that the air pressure at the upper and lower ends of the valve core 5 is the same, and it only bears the electromagnetic thrust and the reaction force of the return spring 7.

[0040] Example 3, as Figure 1 and Figure 2 As shown, based on Embodiment 1 and Embodiment 2, this utility model also proposes a specific structure for the detection mechanism.

[0041] The detection mechanism includes a junction box 16, a magnet base 17, a permanent magnet 18, and a control circuit assembly 19. The junction box 16 is fixedly installed on top of the housing 9, and the closed end of the guide sleeve 10 also extends into the junction box 16. The magnet base 17 is fixedly connected to one end of the moving iron core 13 opposite to the fixed iron core 12. The permanent magnet 18 is fixedly installed on the magnet base 17. The control circuit assembly 19 is located inside the junction box 16, above the magnet base 17, and the control circuit assembly 19 can detect the displacement of the permanent magnet 18.

[0042] As described above, the valve seat 2, valve core 5, and valve stem 14 are coaxially distributed, and the valve core 5, valve stem 14, moving iron core 13, and permanent magnet 18 can move synchronously. Therefore, the control circuit assembly 19 only needs to detect the displacement of the permanent magnet 18 to know the displacement of the valve core 5 and the opening degree of the first valve port, thereby greatly improving the flow control accuracy of the solenoid valve.

[0043] Specifically, the control circuit assembly 19 includes an existing control circuit board with a magnetic induction chip and a control chip. The permanent magnet 18 moves with the movement of the moving iron core 13. The magnetic induction chip senses the change in magnetic field strength based on the position change of the permanent magnet 18 and transmits it to the control chip for identification and processing. Therefore, the control chip can identify the opening position of the valve core 5 at the first valve port and adjust the current magnitude, thereby accurately controlling the opening amount of the first valve port to meet the system's requirements for outlet flow.

[0044] In addition, the solenoid valve is equipped with O-rings of various diameters to prevent gas leakage from the valve body 1 and to block gas leakage and cross-contamination at the customer interface.

[0045] Working principle: In the initial state, both the first valve port and the second valve port are in the open state.

[0046] Electromagnetic drive section: When the solenoid valve receives the valve opening command from the air conditioning system, the control chip on the control circuit board can convert the signal into the current signal required by the solenoid valve. After receiving the current, the electromagnetic coil assembly 11 generates an electromagnetic force. The magnitude of the electromagnetic force is proportional to the strength of the current signal. The electromagnetic force pushes the moving iron core 13 downward toward the fixed iron core 12, and the moving iron core 13 will drive the valve stem 14 to move downward at the same time. The lower end of the valve stem 14 contacts the valve core 5. The return spring 7 below the flange end of the valve core 5 prevents the valve stem 14 from moving downward. After the magnitude of the electromagnetic force is balanced with the reaction force of the return spring 7, a downward displacement is generated, thereby changing the channel area of ​​the first valve port.

[0047] During operation, a large current is first used to close the small valve port and push the valve seat 2 downward to close the large valve port. Then, the current is reduced to gradually open the small valve port, and the valve port opening is adjusted appropriately according to the system requirements. At this time, due to the large pressure difference between the upper and lower ends of the valve seat 2, the valve seat 2 is pressed to the lower end, the second valve port is in the closed state, and the solenoid valve is in the proportional throttling working state. The air conditioning refrigerant enters from the inlet 101 end of the valve body 1, enters the first cavity through the through hole 202 of the valve seat 2, then enters the second cavity through the first valve port after throttling along the central hole 201, and finally flows out through the outlet 102.

[0048] When the solenoid valve is de-energized, the valve stem 14 is pushed back to the upper end by the return spring 7, the flow rate of the first valve port increases, and the pressure at the upper end of the valve seat 2 decreases; when the sum of the air pressure at the upper end of the valve seat 2 and the elastic force of the balance spring 21 is less than the sum of the air pressure at the lower end of the valve seat 2 and the elastic force of the main spring 8, the main spring 8 overcomes the pressure on the upper end of the valve seat 2 and the elastic force of the balance spring 21 to open the second valve port upward.

[0049] Valve opening detection: The control circuit board has a magnetic induction chip and a control chip. The permanent magnet 18 moves with the movement of the moving iron core 13. The magnetic induction chip senses the change in magnetic field strength according to the position change of the permanent magnet 18 and transmits it to the control chip for identification and processing. Therefore, the control chip can identify the opening position of the valve core 5 at the first valve port and adjust the current, thereby accurately controlling the opening amount of the first valve port to meet the system's requirements for outlet flow.

[0050] When the solenoid valve receives the valve opening command from the air conditioning system, the control chip on the control circuit board converts the signal into the current signal required by the solenoid valve, and reads the displacement of the valve core 5 through the sensing chip (the existing magnetic induction chip), and corrects the drive current to keep the valve core 5 and valve body 1 at the correct opening; if the control chip cannot make the displacement match the input requirement, it will automatically send an alarm signal to the outside, thereby realizing the precise control and fault alarm of the solenoid valve.

[0051] In summary, this utility model proposes a multifunctional solenoid valve for use in automotive air conditioning systems. This solenoid valve can automatically detect and adjust the valve opening, and has the functions of small-diameter proportional opening and large-diameter flow. It can realize the functions of both cooling and heating modes of the system on a single valve. At the same time, it senses the magnetic field change of the displacement of the moving iron core 13 through a LIN communication sensing circuit, compares the valve opening electrical signal with the air conditioning system command, and makes corrections, thereby realizing precise closed-loop control of the solenoid valve opening and providing feedback of the actual status signal of the solenoid valve to the air conditioning system.

[0052] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A multifunctional solenoid valve, characterized in that: The valve body (1) includes a valve seat (2) and a valve core (5) that can move axially inside the valve body (1). The valve core (5) and the valve seat (2) have a first valve port, and the valve seat (2) and the valve body (1) have a second valve port. The flow rate of the first valve port is less than the flow rate of the second valve port, and the valve body (1) is provided with a detection mechanism for detecting the opening degree of the first valve port.

2. The multifunctional solenoid valve according to claim 1, characterized in that: The valve body (1) is equipped with a valve cover (3) and a block (4) at its upper and lower ends respectively. The valve cover (3) and the valve seat (2) have a first cavity, and the block (4) and the valve seat (2) have a second cavity. The valve body (1) is also provided with an inlet (101) and an outlet (102). The inlet (101) is connected to the first cavity, the outlet (102) is connected to the second cavity, and the first cavity and the second cavity are connected through the first valve port. The inlet (101) and the second cavity are connected through the second valve port.

3. The multifunctional solenoid valve according to claim 2, characterized in that: The valve seat (2) has a central hole (201) at its center for connecting the first cavity and the second cavity, and a through hole (202) is provided on the periphery of the central hole (201) for connecting the inlet (101) and the first cavity.

4. The multifunctional solenoid valve according to claim 2, characterized in that: A balance spring (21) is provided between the valve seat (2) and the valve cover (3), and a main spring (8) is provided between the valve seat (2) and the block (4).

5. The multifunctional solenoid valve according to claim 2, characterized in that: A guide sleeve (10) is provided above the valve cover (3). A fixed iron core (12) is fixedly installed on the inner side of the guide sleeve (10), and a coil assembly (11) is provided on the outer side of the guide sleeve (10). A movable iron core (13) is slidably installed above the fixed iron core (12). A valve stem (14) is fixedly installed on the movable iron core (13), and one end of the valve stem (14) passes through the fixed iron core (12) and abuts against the end of the valve core (5).

6. The multifunctional solenoid valve according to claim 5, characterized in that: There is a third cavity (20) between the valve cover (3) and the fixed iron core (12). The upper part of the valve core (5) passes through the valve cover (3) and is embedded in the third cavity (20). A core hole (501) for connecting the first cavity and the third cavity is opened at the center of the valve core (5).

7. The multifunctional solenoid valve according to claim 6, characterized in that: The detection mechanism includes a magnet base (17), which is fixedly connected to one end of the moving iron core (13) opposite to the fixed iron core (12). A permanent magnet (18) is provided on the magnet base (17), and a control circuit assembly (19) capable of detecting the displacement of the permanent magnet (18) is provided above the magnet base (17).

8. The multifunctional solenoid valve according to claim 7, characterized in that: A reset spring (7) is provided between the upper part of the valve core (5) and the valve cover (3), and a limit spring (15) is provided between the moving iron core (13) and the guide sleeve (10), and the limit spring (15) is coaxial with the guide sleeve (10).

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