Electronic expansion valve for vehicle

Abstract

The utility model provides an automotive electronic expansion valve, which belongs to the technical field of automotive parts and comprises a limit seat, a central through hole is formed in the limit seat, a spiral guide rail taking the central through hole as the center is arranged on the end face of the limit seat, and the spiral guide rail is provided with two stroke limit positions; the screw rod can rotate relative to the limiting seat, the screw rod is provided with a stop lever, the stop lever can slide relative to the axial direction and the radial direction of the screw rod and is fixed to the screw rod in the circumferential direction, and the stop lever is in sliding connection with the spiral guide rail; when the screw rod rotates, the stop lever is driven to move along the spiral guide rail, so that the stop lever moves relative to the axial direction and the radial direction of the screw rod; when the screw rotates to the limit position, the stop lever is located at the stroke limit position, and the stop lever abuts against the wall part of the spiral guide rail to limit rotation of the screw; the utility model has the beneficial effects that the limiting seat with the spiral guide rail is specially designed, and the hard limiting effect can be realized when the stop lever is contacted with the tail end wall part of the spiral guide rail.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vehicle parts, and relates to a vehicle electronic expansion valve. BACKGROUND

[0002] The vehicle electronic expansion valve is a key component in a vehicle air conditioner and refrigeration system, which is mainly used to accurately control the refrigerant flow into the evaporator, so as to control the refrigerating capacity and energy efficiency ratio of the vehicle air conditioning system. The basic working principle of the electronic expansion valve is that the magnetic rotor in the actuator drives the screw rod to rotate, and the screw rod moves along the axial direction under the action of the threaded structure of the valve core, thereby driving the valve needle to move along the axial direction, and further adjusting the flow area between the valve needle and the valve seat.

[0003] Compared with the electronic expansion valve in the household air conditioning system, the vehicle electronic expansion valve has more stringent requirements for the stroke limiting of the valve needle. Specifically, the magnetic rotor (screw rod) of the electronic expansion valve must stop immediately when reaching the two stroke limits. If the magnetic rotor (screw rod) exceeds the stroke position, not only the valve core structure will be damaged, but also the subsequent positioning of the valve needle will be inaccurate. Therefore, in the prior art, a stop rod is usually arranged on the screw rod, and a limiting sliding ring is designed on the valve core. When the screw rod rotates to the stroke limit position, the stop rod contacts with the limiting sliding ring, thereby limiting the screw rod.

[0004] However, the limiting design of the stop rod and the limiting sliding ring is very troublesome in actual assembly, and the stop rod and the limiting sliding ring are essentially limited by the spring. In fact, there is room for improvement in the effect of limiting stop. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems existing in the prior art, and provides a vehicle electronic expansion valve.

[0006] The purpose of the utility model can be achieved by the following technical scheme: a vehicle electronic expansion valve, comprising:

[0007] A limiting seat is provided with a center through hole, and the end face of the limiting seat is provided with a spiral guide rail centered on the center through hole, and the spiral guide rail has two stroke limit positions;

[0008] A screw rod passes through the center through hole, and the screw rod can rotate relative to the limiting seat. The screw rod is provided with a stop rod, the stop rod is arranged to be able to slide relative to the axial direction and the radial direction of the screw rod and be fixed in the circumferential direction of the screw rod, and the stop rod is in sliding connection with the spiral guide rail;

[0009] When the screw rotates, the stopper is driven to move along the spiral guide rail, so that the stopper moves relative to the axial direction and the radial direction of the screw; when the screw rotates to the limit position, the stopper is located at the stroke limit position, and the stopper abuts against the wall of the spiral guide rail to limit the rotation of the screw.

[0010] Preferably, the screw is provided with a radial through hole, the stopper is arranged in the radial through hole and fixed in the circumferential direction of the screw, the radial through hole penetrates in the radial direction of the screw, and the radial through hole allows the stopper to move in the axial direction and the radial direction of the screw.

[0011] Preferably, the part of the stopper extending out of the radial through hole is bent to form a sliding block part, and the sliding block part extends into the spiral guide rail.

[0012] Preferably, the valve body is further provided with a limiting seat.

[0013] Preferably, the end surface of the valve body is provided with a mounting groove, and the limiting seat is arranged in the mounting groove and welded with the valve body.

[0014] Preferably, the valve body is fixedly connected with a threaded part, the threaded part is provided with a threaded hole, and the screw is arranged in the valve body and connected with the threaded hole.

[0015] Preferably, the threaded part is welded with the valve body or integrally connected with the valve body through injection molding.

[0016] Preferably, the threaded part is made of polyether ether ketone.

[0017] Preferably, the valve body is further provided with a magnetic rotor, the magnetic rotor is provided with a hollow structure, the screw is arranged in the magnetic rotor, and the magnetic rotor is fixedly connected with the screw through a fixing support.

[0018] Preferably, the outer periphery of the fixing support is fixedly connected with the inner wall surface of the magnetic rotor, the fixing support is provided with an axle hole, and the screw is arranged in the axle hole and keyed with the axle hole.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] 1. A limiting seat with a spiral guide rail is specially designed, and the hard limiting effect can be realized when the stopper abuts against the end wall of the spiral guide rail.

[0021] 2. The hard limiting of the stopper and the spiral guide rail avoids the defects of the elastic limiting, avoids the out-of-step situation caused by the elastic limiting, greatly improves the consistency of the valve needle position and the opening valve pulse signal, and completely solves the incomplete closing valve situation caused by the rebound of the magnetic rotor.

[0022] 3. Compared to machining threaded holes directly on the valve body, using separate threaded components can significantly reduce manufacturing costs without sacrificing performance. This is because the valve body material may not be suitable for directly machining high-precision, high-wear-resistant threaded holes, while using wear-resistant materials to specially manufacture threaded components is more economical and efficient. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal structure of the electronic expansion valve for vehicles according to this utility model.

[0024] Figure 2 This is a schematic diagram showing the connection relationship between the screw, the limiting seat, and the valve body of this utility model.

[0025] Figure 3 This is a schematic diagram showing the connection relationship between the screw, the stop bar, and the limiting seat of this utility model.

[0026] Figure 4 This is a schematic diagram of the valve body of this utility model.

[0027] In the diagram, 100 is the limiting seat; 110 is the central through hole; 120 is the spiral guide rail; 200 is the screw; 210 is the radial through hole; 300 is the stop bar; 310 is the slider part; 400 is the valve body; 410 is the mounting groove; 500 is the threaded part; 510 is the threaded hole; 600 is the magnetic rotor; 610 is the fixed bracket; and 611 is the shaft hole. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0029] like Figures 1 to 3 As shown, an automotive electronic expansion valve includes: a limiting seat with a central through hole, and a spiral guide rail centered on the central through hole on the end face of the limiting seat, the spiral guide rail having two stroke limit positions; a screw passing through the central through hole, the screw being rotatable relative to the limiting seat, the screw having a stop bar configured to slide axially and radially relative to the screw and circumferentially fixed to the screw, the stop bar being slidably connected to the spiral guide rail; when the screw rotates, it drives the stop bar to move along the spiral guide rail, causing the stop bar to move axially and radially relative to the screw; when the screw rotates to the limit position, the stop bar is located at the stroke limit position, and the stop bar abuts against the wall of the spiral guide rail to limit the rotation of the screw.

[0030] The limiting seat has a central through hole for the screw to pass through. On one end face of the limiting seat, a helical guide rail is designed around this central through hole, with two limit positions (i.e., the two ends of the guide rail). The limiting seat can be formed into the helical guide rail using a planar stamping process, thus reducing manufacturing costs. A stop bar is mounted on the screw, characterized in that it can only slide axially and radially on the screw, while remaining circumferentially fixed to the screw.

[0031] The stop rod is slidably connected to the helical guide rail. When the screw rotates, it drives the stop rod to rotate as well, causing the slider part of the stop rod to slide along the helical guide rail. At this time, the stop rod will have radial movement relative to the screw. Axial movement is allowed between the stop rod and the screw. The screw achieves axial movement through a threaded hole, while the stop rod remains stationary in the axial direction. When the screw rotates to its maximum angle position, the stop rod is exactly at one of its stroke limit positions. At this time, the stop rod abuts against the wall of the helical guide rail, thus achieving a hard limiting effect.

[0032] In this design, a spiral guide rail located on a plane is cleverly set in the limiting seat. The two ends of the spiral guide rail (the travel limit positions) are used to block the stop rod. Since the stop rod and the screw are circumferentially fixed, the screw can be prevented from continuing to rotate in the same direction. In this way, the travel limit function can be accurately achieved, and the assembly difficulty of the stop rod and the spiral guide rail is greatly reduced.

[0033] Furthermore, in the existing design, the limiting slip ring is similar to an elastic element. The stop rod and the limiting slip ring are actually limited by elasticity. This causes the position of the valve needle to be inconsistent with the valve opening pulse signal when the screw rotates to the end of the valve opening stroke due to the rotational inertia of the magnetic rotor. Similarly, during the closing stroke, due to the rotational inertia of the magnetic rotor, the stop rod and the limiting slip ring will undergo a certain elastic deformation after contact, causing the magnetic rotor to rebound, thus preventing the valve needle from completely closing the valve port.

[0034] In this design, the defects of the elastic limit mentioned above are avoided by using the hard limit of the stop rod and the spiral guide rail. This avoids the step loss caused by the elastic limit, greatly improves the consistency between the valve needle position and the valve opening pulse signal, and completely solves the problem of incomplete valve closing caused by the springback of the magnetic rotor.

[0035] Based on the above implementation method, the screw has a radial through hole, the stop rod passes through the radial through hole and is fixed circumferentially to the screw, the radial through hole is through the radial direction of the screw, and the radial through hole allows the stop rod to move along the axial direction and radial direction of the screw.

[0036] The radial through-hole extends through the screw rod in the radial direction, from one side to the other. This means the stop rod can move freely along the radial direction of the screw rod. The width of the radial through-hole is the same as the width of the stop rod, so the stop rod is inserted into the radial through-hole and remains circumferentially fixed to the screw rod. This means that when the screw rod rotates, the stop rod rotates with the screw rod and does not rotate relative to it. The height of the radial through-hole allows the stop rod to move freely in the axial direction of the screw rod.

[0037] When the screw starts to rotate, it forces the stop rod to rotate along with it through the radial through-hole. At the same time, the stop rod can move freely along the axial and radial directions of the screw within the radial through-hole. This design is mainly to allow the stop rod to move on the helical guide rail and to adaptively adjust to the trajectory shape of the helical guide rail and the axial movement of the screw.

[0038] Based on the above implementation method, the portion of the stop bar extending out of the radial through hole is bent to form a slider portion, which extends into the spiral guide rail.

[0039] A portion of the stop bar extends from the radial through-hole and is bent to form a slider. This bending design is to accommodate use with a helical guide rail. The slider serves as the part that directly contacts the helical guide rail and slides along its path.

[0040] like Figures 1 to 4 As shown, based on the above embodiment, it also includes a valve body, with a limiting seat fixedly connected to the valve body. In this embodiment, the limiting structure (limiting seat) is designed separately on the valve body, making the overall structure simpler and more reliable, thereby simplifying the entire manufacturing and assembly process of the expansion valve. This not only reduces production costs but also reduces problems caused by improper assembly.

[0041] Based on the above implementation method, an installation groove is provided on the end face of the valve body, and the limiting seat is installed in the installation groove and welded to the valve body.

[0042] The limit seat is placed in the mounting groove on the end face of the valve body according to design requirements. The limit seat should fit tightly with the mounting groove to ensure that it does not shift or tilt during subsequent welding.

[0043] This design also has the advantage of easy assembly. During assembly, the screw can be rotated to its limit position first, and then the position of the limit seat can be adjusted so that the end wall of the spiral guide rail abuts against the sliding block. Then the limit seat can be fixed together with the valve body.

[0044] like Figures 1 to 4 As shown, based on the above embodiment, a threaded component is fixedly connected to the valve body. The threaded component has a threaded hole, and the screw passes through the valve body and connects to the threaded hole.

[0045] It is important to note here that the screw needs to mate with a threaded hole to work, enabling the screw to move axially. The threaded component is a separate assembly, usually made of expensive, wear-resistant materials. It has precisely machined internal threaded holes to mate with the threaded portion of the screw.

[0046] Using wear-resistant materials to manufacture threaded parts can significantly improve the wear resistance of threaded holes, extend the service life of components, and reduce the need for maintenance and replacement. Compared to machining threaded holes directly on the valve body, using separate threaded parts can significantly reduce manufacturing costs without sacrificing performance. This is because valve body materials may not be suitable for directly machining high-precision, high-wear-resistant threaded holes, while using wear-resistant materials to specially manufacture threaded parts is more economical and efficient.

[0047] Based on the above embodiments, the threaded component is welded to the valve body or integrally connected by injection molding. Specifically, the threaded component and the valve body can be fixed together by ultrasonic welding or injection molded together by in-mold implantation, thereby reducing processing difficulty and procedures.

[0048] Preferably, the threaded component is made of polyetheretherketone (PEEK). PEEK is a high-performance engineering plastic with excellent wear resistance, enabling it to operate stably for extended periods without lubrication. Furthermore, PEEK possesses high strength and rigidity, along with good impact resistance and fatigue strength.

[0049] like Figures 1 to 3 As shown, based on the above embodiment, it also includes a magnetic rotor, which is configured as a hollow structure, with a screw passing through it, and the magnetic rotor and the screw are fixedly connected by a fixed bracket.

[0050] The upper part of the screw passes through the inside of the magnetic rotor, and the screw and the magnetic rotor are fixedly connected by a fixed bracket, so the magnetic rotor can drive the screw to rotate when it rotates.

[0051] Based on the above implementation method, the outer periphery of the fixed bracket is fixedly connected to the inner wall of the magnetic rotor, the fixed bracket is provided with a shaft hole, the screw passes through the shaft hole and is keyed to the shaft hole.

[0052] The fixed bracket connects the magnetic rotor to the screw, transmitting torque. It's essentially similar to a flange structure. To ensure synchronous rotation between the screw and the fixed bracket, a keyed connection is used. This means a keyway is created in the screw or shaft hole, and by inserting a key (e.g., a flat key, a semi-circular key), a mechanical lock is formed between the screw and the fixed bracket, preventing relative slippage. Furthermore, the screw and fixed bracket are axially locked together using a snap ring.

[0053] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0054] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. An electronic expansion valve for automobiles, characterized in that, include: A limiting seat is provided with a central through hole, and a spiral guide rail centered on the central through hole is provided on the end face of the limiting seat. The spiral guide rail has two travel limit positions. A screw rod passes through the central through hole and is rotatable relative to the limiting seat. The screw rod is provided with a stop bar, which is configured to slide relative to the screw rod axially and radially and be circumferentially fixed to the screw rod. The stop bar is slidably connected to the helical guide rail. When the screw rotates, it drives the stop rod to move along the spiral guide rail, causing the stop rod to move axially and radially relative to the screw; when the screw rotates to the limit position, the stop rod is located at the stroke limit position, and the stop rod abuts against the wall of the spiral guide rail to restrict the rotation of the screw.

2. The automotive electronic expansion valve as described in claim 1, characterized in that: The screw has a radial through hole, and the stop rod passes through the radial through hole and is circumferentially fixed to the screw. The radial through hole extends through the screw in the radial direction and allows the stop rod to move along the axial and radial directions of the screw.

3. The automotive electronic expansion valve as described in claim 2, characterized in that: The portion of the stop bar extending out of the radial through hole is bent to form a slider portion, which extends into the spiral guide rail.

4. The automotive electronic expansion valve as described in claim 1, characterized in that: It also includes a valve body, and the limiting seat is fixedly connected to the valve body.

5. The automotive electronic expansion valve as described in claim 4, characterized in that: The valve body has an installation groove on its end face, and the limiting seat is installed in the installation groove and welded to the valve body.

6. The automotive electronic expansion valve as described in claim 4, characterized in that: A threaded component is fixedly connected to the valve body, the threaded component has a threaded hole, and the screw passes through the valve body and is connected to the threaded hole.

7. The automotive electronic expansion valve as described in claim 6, characterized in that: The threaded component is welded to the valve body or integrally connected by injection molding.

8. An electronic expansion valve for vehicles as described in claim 6 or 7, characterized in that: The threaded component is configured as a polyetheretherketone (PEEK) component.

9. The automotive electronic expansion valve as described in claim 1, characterized in that: It also includes a magnetic rotor, which is configured as a hollow structure, with the screw passing through the magnetic rotor, and the magnetic rotor and the screw being fixedly connected by a fixed bracket.

10. The automotive electronic expansion valve as described in claim 9, characterized in that: The outer periphery of the fixed bracket is fixedly connected to the inner wall of the magnetic rotor. The fixed bracket has a shaft hole, and the screw passes through the shaft hole and is keyed to the shaft hole.

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