Electronic expansion valve for vehicle

Abstract

The invention discloses a vehicle electronic expansion valve which comprises a coil body, a valve cover and a sealing piece, and the valve cover covers the coil body; the sealing piece is arranged between the valve cover and the coil body, and the coil body and the valve cover are matched to abut against the sealing piece. According to the technical scheme, the waterproof performance of the product can be improved, the quality of the product is guaranteed, and the waterproof reliability is improved.

Description

Technical Field

[0001] The invention relates to the field of electronic expansion valves, and in particular to a vehicle electronic expansion valve. Background Art

[0002] The electronic expansion valve (EEV) is an expansion valve specially used in automobile air conditioning systems to control the flow of refrigerant in automobile air conditioning. The solenoid valve part of the electronic expansion valve is usually required to have a certain waterproof performance to ensure normal operation in a humid or water vapor environment. At present, the coil body and the valve cover are sealed by covering; or a protective cover is set on the outside; this sealing method is not reliable, and water vapor can easily enter the coil body, causing damage or failure of electrical components, and affecting the service life of the electronic expansion valve. Summary of the invention

[0003] The main purpose of the present invention is to provide an electronic expansion valve for a vehicle, aiming to improve the waterproof performance of the product, ensure the quality of the product, and enhance the reliability of waterproofing.

[0004] To achieve the above object, the present invention provides a vehicle electronic expansion valve, comprising: Coil body; a valve cover, the valve cover covering the coil body; and The sealing member is arranged between the valve cover and the coil body, and the coil body and the valve cover cooperate to press the sealing member.

[0005] Optionally, a sealing groove is provided on the periphery of the valve cover facing the coil body; and the sealing member is embedded in the sealing groove.

[0006] Optionally, the coil body has an annular protrusion facing the bottom of the valve cover, the valve cover is provided with a mounting groove corresponding to the annular protrusion, the annular protrusion is plugged into the mounting groove, the sealing groove is provided on the groove wall of the mounting groove, and the opening of the sealing groove faces the outer wall of the annular protrusion.

[0007] Optionally, the sealing member is configured as a sealing ring.

[0008] Optionally, the valve cover and the coil body are welded by laser or ultrasonic welding.

[0009] Optionally, the coil body is integrally formed by injection molding.

[0010] Optionally, the vehicle electronic expansion valve further includes a fixing part and a valve seat, wherein the fixing part is arranged on the other side of the coil body relative to the valve cover, the fixing part is connected to the coil body, and the fixing part is used to connect to the valve seat.

[0011] Optionally, the coil body is provided with a mounting protrusion for mounting the fixing member, and the coil body is arranged on the mounting protrusion.

[0012] Optionally, the fixing piece is connected to the mounting protrusion by hot melting.

[0013] Optionally, the vehicle electronic expansion valve also includes a first pole plate, a second pole plate, a first winding and a second winding, and a winding installation cavity is also provided in the coil body, and the first winding, the first pole plate, the second winding and the second pole plate are installed in the winding installation cavity in sequence.

[0014] Optionally, the vehicle electronic expansion valve further includes an electric control board, and a mainboard mounting position is further arranged in the coil body, the mainboard mounting position is above the winding mounting cavity, and the electric control board is arranged at the mainboard mounting position.

[0015] The technical solution of the present invention adopts a coil body, a valve cover and a sealing member, wherein the valve cover covers the coil body; the sealing member is arranged between the valve cover and the coil body, and the coil body and the valve cover cooperate to press the sealing member. At present, most of the electronic expansion valves for vehicles adopt the method of welding the valve cover and the coil body after covering them, so as to ensure the sealing and waterproofness between the valve cover and the coil body. However, the sealing between the valve cover and the coil body is limited by the process and the use scenario, and cannot guarantee a complete seal, which makes it easy for water vapor to enter the coil body, causing damage or failure of the electrical components, and affecting the service life of the electronic expansion valve for vehicles. By adding a sealing member arranged between the valve cover and the coil body, the coil body and the valve cover cooperate to press the sealing member, so as to form a second seal between the valve cover and the coil body, thereby improving the waterproof performance of the product, ensuring the quality of the product, and improving the reliability of waterproofness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 The figure is a schematic structural diagram of an embodiment of a coil body in a vehicle electronic expansion valve of the present invention.

[0018] Description of Figure Numbers:

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The electronic expansion valve (EEV) is an expansion valve specially used in automobile air conditioning systems to control the flow of refrigerant in automobile air conditioning. The solenoid valve part of the electronic expansion valve is usually required to have a certain waterproof performance to ensure normal operation in a humid or water vapor environment. At present, the coil body and the valve cover are sealed by covering; or a protective cover is set on the outside; this sealing method is not reliable, and water vapor can easily enter the coil body, causing damage or failure of electrical components, and affecting the service life of the electronic expansion valve.

[0025] To this end, the present invention proposes an automotive electronic expansion valve, which aims to improve the waterproof performance of the product, ensure the quality of the product, and enhance the reliability of waterproofing.

[0026] In one embodiment of the present invention, Figure 1 As shown, the vehicle electronic expansion valve 100 comprises: Coil body 200; A valve cover 300, the valve cover 300 and the coil body 200 are covered; and The sealing member 410 is disposed between the valve cover 300 and the coil body 200 . The coil body 200 and the valve cover 300 cooperate to press against the sealing member 410 .

[0027] The structure of the automotive electronic expansion valve 100 is similar to that of a common electronic expansion valve, including a solenoid valve part, a driving mechanism, a valve core and a control circuit. It is designed to accurately control the flow of refrigerant in the automotive air conditioning system to meet the comfortable temperature requirements in the vehicle.

[0028] If the electronic expansion valve is divided into two parts, the lower part is a valve seat (not shown in the figure) having a valve port that cooperates with the valve core, and the other part can be called a valve body or a coil body 200.

[0029] In the above definition, the coil body 200 (Valve Body) refers to the part connected to the valve seat, and the coil body 200 is used to install components such as the electromagnetic coil and the valve core. The coil body 200 provides a structural frame to support and fix the electromagnetic coil, the valve core and other components, and also plays a role in protection and sealing. The valve body is usually provided with channels corresponding to the valve seat, through which the refrigerant can flow through the valve body into the valve seat, thereby achieving flow control.

[0030] The valve cover 300 is a relatively general term, which can refer to the covering part on the top of the coil body 200. The valve cover 300 is mainly used to protect the components inside the coil body 200 and provide necessary sealing. In some cases, the valve cover 300 can also be used to install additional sensors, connection harnesses or other accessories.

[0031] Currently, most automotive electronic expansion valves 100 use a valve cover 300 and a coil body 200 that are welded together to ensure the sealing and waterproof properties between the valve cover 300 and the coil body 200. However, the sealing between the valve cover 300 and the coil body 200 is limited by the process and the usage scenario, and cannot guarantee complete sealing, which makes it easy for water vapor to enter the coil body 200, causing damage or failure of electrical components, thereby affecting the service life of the automotive electronic expansion valve 100.

[0032] In this solution, a sealing member 410 is added between the valve cover 300 and the coil body 200. The coil body 200 and the valve cover 300 cooperate to press against the sealing member 410, thereby forming a second seal between the valve cover 300 and the coil body 200, thereby improving the waterproof performance of the product, ensuring the quality of the product, and enhancing the reliability of waterproofing.

[0033] In one embodiment, the sealing member 410 is a gasket, which is disposed at the covering position between the valve cover 300 and the coil body 200 .

[0034] In another embodiment, the sealing member 410 is a sealing ring, and a sealing groove 320 is provided on the periphery of the valve cover 300 facing the coil body 200 ; the sealing member 410 is embedded in the sealing groove 320 .

[0035] It should be noted that both the gasket and the sealing ring are made of waterproof materials. The specific material is selected according to the actual usage scenario without too much restriction.

[0036] Furthermore, in order to ensure the sealing effect, the valve cover 300 is provided with a sealing groove 320 at the periphery facing the coil body 200 ; the sealing member 410 is embedded in the sealing groove 320 .

[0037] In one embodiment, multiple sealing grooves 320 may be provided on the valve cover 300. It is not difficult to understand that in the scheme of providing the sealing grooves 320, the sealing grooves 320 may be provided at the outer side, end or inner side of the coil body 200. Specifically.

[0038] In another embodiment, in order to achieve better sealing between the valve cover 300 and the coil body 200 with a minimum structure, thereby improving the waterproof performance of the product, ensuring the quality of the product, and enhancing the reliability of waterproofing, the coil body 200 has an annular protrusion 210 facing the bottom of the valve cover 300, and the valve cover 300 is provided with a mounting groove 310 corresponding to the annular protrusion 210, the annular protrusion 210 is plugged into the mounting groove 310, and the sealing groove 320 is provided on the groove wall of the mounting groove 310, and the opening of the sealing groove 320 faces the outer wall of the annular protrusion 210.

[0039] In this way, when the valve cover 300 is covered on the coil body 200, the valve cover 300 and the coil body 200 are interference fit due to the pressure of the sealing ring, which can ensure that the valve cover 300 and the coil body 200 are covered stably and have good sealing performance; it can also facilitate operation when the valve cover 300 and the coil body 200 are fixed later, the valve cover 300 and the coil body 200 are not easy to shake, and the assembly of the sealing ring is also more convenient.

[0040] In order to avoid a gap between the valve cover 300 and the coil body 200, the valve cover 300 and the coil body 200 are welded by laser or ultrasonic. Both laser welding and ultrasonic welding can achieve high-strength welded joints. During the welding process, the material at the weld is subjected to high temperature and high energy, so that the metal in the weld area has better bonding and strength, thereby improving the strength of the entire valve body and the valve cover 300.

[0041] Laser welding and ultrasonic welding have high welding quality and reliability, and can achieve welds with good sealing properties. This is very important for the valve body and the valve cover 300, because the valve body and the valve cover 300 need to achieve good sealing properties to ensure that the valve does not leak air or liquid during operation.

[0042] Laser welding and ultrasonic welding are non-contact welding methods that do not require the use of additional welding materials, thus avoiding the introduction of contaminants or impurities. This makes the welded joints purer and does not contaminate the fluid medium, making them suitable for valve bodies and valve covers that require higher material purity.

[0043] Both laser welding and ultrasonic welding can achieve a smaller welding heat-affected zone, thereby reducing deformation and defects in the welding area. This makes the appearance of the welded joint more beautiful and meets the aesthetic standards of industrial products.

[0044] In order to ensure the protection performance and improve the quality of the product, the coil body 200 is injection molded in one piece. The coil body 200 adopts an integral molding structure, which is solid and firm, the thickness of the product is accurate, and the protection capability is good.

[0045] In order to facilitate the connection between the coil body 200 and the valve seat (not shown in the figure), the vehicle electronic expansion valve 100 further includes a fixing member 420 and a valve seat. The fixing member 420 is arranged on the other side of the coil body 200 relative to the valve cover 300, and the fixing member 420 is connected to the coil body 200. The fixing member 420 is used to connect the valve seat. The fixing member 420 is connected to the valve seat, and the connection is more convenient, the docking accuracy is higher, and the sealing performance is better.

[0046] In order to facilitate the installation of the fixing member 420 and the coil body 200 , the coil body 200 is provided with a mounting protrusion 220 for mounting the fixing member 420 , and the coil body 200 is disposed on the mounting protrusion 220 .

[0047] In one embodiment, the fixing member 420 may be sealed and connected to the coil body 200 by gluing or other methods.

[0048] In another embodiment, in order to improve the quality of connection, the fixing member 420 is connected to the mounting protrusion 220 by hot melting. In this way, the fixing member 420 and the coil body 200 are integrated, the structure is more solid, and the product quality is better.

[0049] Specifically, the automotive electronic expansion valve 100 also includes a first pole plate 430, a second pole plate 440, a first winding 450 and a second winding 460. A winding installation cavity 230 is also provided in the coil body 200. The first winding 450, the first pole plate 430, the second winding 460 and the second pole plate 440 are installed in the winding installation cavity 230 in sequence.

[0050] like Figure 1 As shown, the first pole plate 430, the second pole plate 440, the first winding 450 and the second winding 460 are formed into a whole through the installation frame 470, and then installed in the winding installation cavity 230, which is more convenient to install.

[0051] Specifically, the vehicle electronic expansion valve 100 further includes an electric control board 480, which is also provided in the coil body 200 at a mainboard mounting position 240, the mainboard mounting position 240 being above the winding mounting cavity 230, and the electric control board 480 being provided at the mainboard mounting position 240. The electric control board 480 and the plug pin 490 are electrically connected by soldering or ultrasonic welding, and the electric control board 480 can meet LIN or CAN protocol communication to realize the control of the electronic expansion valve by the whole vehicle.

[0052] In summary, the technical solution of the present invention adopts the coil body 200, the valve cover 300 and the sealing member 410, wherein the valve cover 300 covers the coil body 200; the sealing member 410 is arranged between the valve cover 300 and the coil body 200, and the coil body 200 and the valve cover 300 cooperate to press the sealing member 410. At present, most of the electronic expansion valves 100 for vehicles adopt the valve cover 300 and the coil body 200 to cover and weld them together, so as to ensure the sealing and waterproofness between the valve cover 300 and the coil body 200. However, the sealing between the valve cover 300 and the coil body 200 is limited by the process and the use scenario, and cannot guarantee complete sealing, so that water vapor can easily enter the coil body 200, causing damage or failure of the electrical components, and affecting the service life of the electronic expansion valve 100 for vehicles. By adding a seal 410 between the valve cover 300 and the coil body 200, the coil body 200 and the valve cover 300 cooperate to press the seal 410, so as to form a second seal between the valve cover 300 and the coil body 200, thereby improving the waterproof performance of the product, ensuring the quality of the product, and improving the reliability of waterproofing.

[0053] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A vehicle electronic expansion valve, characterized in that: include: Coil body; A valve cover, the valve cover covers the coil body; and The sealing member is arranged between the valve cover and the coil body, and the coil body and the valve cover cooperate to press the sealing member.

2. The vehicle electronic expansion valve according to claim 1, characterized in that: The valve cover is provided with a sealing groove on the periphery facing the coil body; the sealing member is embedded in the sealing groove.

3. The vehicle electronic expansion valve according to claim 2, characterized in that: The coil body has an annular protrusion facing the bottom of the valve cover, and the valve cover is provided with a mounting groove corresponding to the annular protrusion. The annular protrusion is plugged into the mounting groove, and the sealing groove is provided on the groove wall of the mounting groove, and the opening of the sealing groove faces the outer wall of the annular protrusion.

4. The vehicle electronic expansion valve according to claim 1, characterized in that: The sealing element is configured as a sealing ring.

5. The vehicle electronic expansion valve according to claim 1, characterized in that: The valve cover and the coil body are welded by laser or ultrasonic.

6. The vehicle electronic expansion valve according to claim 1, characterized in that: The coil body is integrally formed by injection molding.

7. The vehicle electronic expansion valve according to claim 1, characterized in that: The vehicle electronic expansion valve further comprises a fixing part and a valve seat. The fixing part is arranged on the other side of the coil body relative to the valve cover, the fixing part is connected to the coil body, and the fixing part is used to connect to the valve seat.

8. The vehicle electronic expansion valve according to claim 7, characterized in that: The coil body is provided with a mounting protrusion for mounting the fixing member, and the coil body is arranged on the mounting protrusion.

9. The vehicle electronic expansion valve according to claim 8, characterized in that: The fixing piece is connected to the mounting protrusion by hot melting.

10. The vehicle electronic expansion valve according to claim 1, characterized in that: The vehicle electronic expansion valve also includes a first pole plate, a second pole plate, a first winding and a second winding. A winding installation cavity is also provided in the coil body. The first winding, the first pole plate, the second winding and the second pole plate are sequentially installed in the winding installation cavity.

11. The vehicle electronic expansion valve according to claim 10, characterized in that: The vehicle electronic expansion valve also includes an electric control board. A mainboard mounting position is also arranged in the coil body. The mainboard mounting position is above the winding mounting cavity. The electric control board is arranged at the mainboard mounting position.

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