Electronic expansion valve, refrigeration equipment and vehicle

Abstract

The invention discloses an electronic expansion valve, refrigeration equipment and a vehicle. The electronic expansion valve comprises a shell, a magnetic rotor and a valve element assembly. An accommodating cavity is formed in the shell; the magnetic rotor is arranged in the containing cavity and is of a hollow structure, and the inner circumferential wall of the magnetic rotor is connected with a connecting plate; the valve element assembly is arranged in the containing cavity and inserted into the lower end of the magnetic rotor, the valve element assembly comprises a valve rod and a nut, the nut is arranged on the valve rod in a sleeving mode, and the valve rod is connected with the connecting plate; the distance between the joint of the connecting plate and the magnetic rotor and the upper end face of the magnetic rotor is configured to be L1, the axial length of the magnetic rotor is configured to be L2, and the ratio of L1 to L2 ranges from 20% to 50%. According to the technical scheme, the problem of poor concentricity caused by deflection of the magnetic rotor is solved by reducing the distance between the connecting plate and the nut.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an electronic expansion valve, a refrigeration device and a vehicle. Background Art

[0002] In existing refrigeration equipment, in order to facilitate the control of the flow rate of refrigerant, an electronic expansion valve is usually installed in the system pipeline. In the related art, a rotor assembly is installed in the electronic expansion valve. By applying a certain regular electromagnetic pulse to the stator coil, the rotor assembly is stimulated to rotate. The conversion structure is used to convert the rotational motion of the rotor assembly into the linear motion of the valve core assembly, thereby realizing the opening and closing of the valve stem to the valve port to adjust the flow rate. However, in the prior art, during the operation of the electronic expansion valve, the magnetic rotor is prone to swing, resulting in poor concentricity, and even causing the magnetic rotor to jam and fail. Summary of the invention

[0003] The main purpose of the present invention is to provide an electronic expansion valve, which aims to solve the problem of poor concentricity caused by the yaw of the magnetic rotor by reducing the distance between the connecting plate and the nut.

[0004] To achieve the above object, the present invention provides an electronic expansion valve, which comprises:

[0005] A housing having an accommodating cavity therein;

[0006] A magnetic rotor is disposed in the accommodating cavity, wherein the magnetic rotor is a hollow structure, and a connecting plate is connected to an inner peripheral wall thereof; and

[0007] A valve core assembly is arranged in the accommodating cavity and inserted in the lower end of the magnetic rotor, the valve core assembly comprises a valve stem and a nut, the nut is sleeved on the valve stem, and the valve stem is connected to the connecting plate;

[0008] The distance between the connection point between the connecting plate and the magnetic rotor and the upper end surface of the magnetic rotor is configured as L1, the axial length of the magnetic rotor is configured as L2, and the ratio of L1 to L2 is between 20% and 50%.

[0009] Optionally, the ratio of L1 to L2 is between 30% and 40%.

[0010] Optionally, the magnetic rotor includes a first magnetic ring and a second magnetic ring, the valve core assembly is inserted into the second magnetic ring, the first magnetic ring is arranged on the upper side of the second magnetic ring, and the connecting plate is arranged on the second magnetic ring.

[0011] Optionally, a first positioning slot is provided on the lower end surface of the first magnetic ring, and a second positioning slot is provided on the upper end surface of the second magnetic ring, the notch of the first positioning slot and the notch of the second positioning slot are relatively abutted, and the magnetic rotor is also provided with a positioning pin, and both ends of the positioning pin are respectively inserted into the first positioning slot and the second positioning slot.

[0012] Optionally, the first magnetic ring and the second magnetic ring are connected by gluing.

[0013] Optionally, the electronic expansion valve further includes a Hall sensor, and the Hall sensor is arranged corresponding to the first magnetic ring, and the number of magnetic poles of the first magnetic ring is greater than the number of magnetic poles of the second magnetic ring.

[0014] Optionally, the number of magnetic poles of the first magnetic ring is 2nN, and the number of magnetic poles of the second magnetic ring is N.

[0015] Optionally, the connecting plate is connected to the magnetic rotor by an injection molding process.

[0016] Optionally, a limiting ring groove is provided on the inner circumference of the magnetic rotor, and the outer circumference of the connecting plate is embedded in the limiting ring groove.

[0017] Optionally, the connection plate is connected to a limit rod, the upper end of the limit rod is connected to the connection plate by welding or riveting, and the limit rod cooperates with a stroke limiter on the nut to limit the movement range of the valve stem.

[0018] The present invention further provides a refrigeration device, which comprises the aforementioned electronic expansion valve.

[0019] The present invention also provides a vehicle, comprising the aforementioned refrigeration device.

[0020] The technical solution of the present invention adjusts the connection position between the connecting plate and the magnetic rotor toward the axial middle of the magnetic rotor to reduce the distance between the force point between the limit rod and the stroke limit piece and the connection point between the connecting plate and the valve stem, that is, the center of gravity height of the magnetic rotor is lowered, and the radial deflection effect of the limit rod on the rotation of the magnetic rotor due to the force of the stroke limit piece is weakened. During the operation of the electronic expansion valve, the rotation center of the magnetic rotor remains coincident with its geometric center, thereby avoiding the deflection of the magnetic rotor and making the concentricity of the magnetic rotor within a benign range, so as to ensure the stability and reliability of the operation of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of an electronic expansion valve of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the central magnetic rotor and the connecting plate;

[0024] Figure 3 for Figure 1 A schematic cross-sectional structure diagram of the explosion state of the central magnetic rotor;

[0025] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of the central magnetic rotor;

[0026] Figure 5 Bit Figure 4 Schematic diagram of magnetic pole distribution of the first magnetic ring;

[0027] Figure 6 Bit Figure 4 Schematic diagram of magnetic pole distribution of the second magnetic ring;

[0028] Figure 7 It is a schematic cross-sectional structure diagram of an embodiment of an electronic expansion valve of the present invention.

[0029] Description of Figure Numbers:

[0030] Label name Label name 100 Magnetic rotor 110 Limiting ring groove 120 The first magnetic ring 121 First positioning slot 130 Second magnetic ring 131 Second positioning slot 140 Positioning pin 200 Connecting plate 300 Limit rod 400 Valve stem 500 Nuts 600 Travel limiter 700 case 800 Hall sensor

[0031] 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

[0032] 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.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) 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.

[0034] 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, the meaning of "and / or" appearing in the full text includes 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 the 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.

[0035] The invention provides an electronic expansion valve.

[0036] To facilitate understanding of the technical solution of the present invention, the working principle of the electronic expansion valve in this solution is first introduced.

[0037] Please refer to Figure 1 and Figure 7The electronic expansion valve includes a shell 700, a rotor assembly, a nut 500 and a valve stem 400. A valve port is provided at the lower end of the shell 700. The rotor assembly, the nut 500 and the valve stem 400 are all arranged in the shell 700. The nut 500 is sleeved on the valve stem 400 and connected to the valve stem 400 by means of a screw nut 500. The valve stem 400 is inserted from the lower end of the magnetic rotor 100 and fixed to the connecting plate 200. A stroke limiter 600 is sleeved on the nut 500. A guide groove in the shape of a screw thread is wound around the outer surface of the nut 500 corresponding to the stroke limiter 600 along its axial direction. When it is necessary to control the valve stem 400 to close the valve port, a certain regular electromagnetic pulse is given to the coil to form a magnetic field to drive the magnetic rotor 100 to rotate around the valve stem 400. At this time, the valve stem 400 rotates synchronously, while the nut 500 remains fixed. Through the connection relationship between the nut 500 and the valve stem 400, the valve stem 400 can be moved along the The axial direction of the valve stem 400 makes linear motion, thereby closing the valve port. During this process, the magnetic rotor 100, the connecting plate 200 and the limiting rod 300 rotate around the center of the valve stem 400, and also make synchronous linear motion with the valve stem 400 along the axial direction of the valve stem 400. After the limiting rod 300 contacts the stroke limiting member 600, the stroke limiting member 600 rotates along the guide groove on the outer periphery of the nut 500 to realize the axial movement of the nut 500. When the valve stem 400 completely closes the valve port, the stroke limiting member 600 also moves to the end of the guide groove. At this time, the stroke limiting member 600 is in the extreme position. In this way, the stroke limiting member 600 cannot continue to rotate, and then acts on the magnetic rotor 100 through the limiting rod 300, thereby limiting the rotation of the magnetic rotor 100. That is, at this time, the magnetic rotor 100, the connecting plate 200, the limiting rod 300 and the valve stem 400 cannot continue to move toward the valve port, thereby avoiding damage to the components in the electronic expansion valve. Similarly, when the valve port is opened to a certain extent, the travel limiter 600 is in another extreme position to prevent the rotor assembly from continuing to move away from the valve port, thereby ensuring the stability of the electromagnetic expansion valve.

[0038] In the prior art, the magnetic rotor 100 and the connecting plate 200 are first connected and formed, and then the valve stem 400 is inserted and fixed on the connecting plate 200, and then the limit rod 300 is welded to the lower surface of the connecting plate 200. Since the welding process requires a certain working space, and due to the limitation between the magnetic rotor 100 and the nut 500, a larger spacing is required between the connecting plate 200 and the nut 500 to meet the welding operation space requirement, so that the limit rod 300 can be stably welded to the lower surface of the connecting plate 200. In this way, the spacing between the connecting plate 200 and the nut 500 will be larger, resulting in a larger distance between the center of gravity of the magnetic rotor 100 and the action point of the limit rod 300 and the stroke limit member 600. During the operation of the electronic expansion valve, the magnetic rotor 100 is prone to sway, which causes the rotation center of the magnetic rotor 100 to deviate from the geometric center of the magnetic rotor 100, resulting in poor concentricity of the magnetic rotor 100, and even causing the magnetic rotor 100 to get stuck, affecting the stability and reliability of the operation of the electronic expansion valve.

[0039] In the embodiment of the present invention, please refer to Figures 1 to 7 , the electronic expansion valve comprises:

[0040] The housing 700 has a receiving cavity therein;

[0041] The magnetic rotor 100 is disposed in the accommodating cavity. The magnetic rotor 100 is a hollow structure, and the inner peripheral wall thereof is connected to a connecting plate 200; and

[0042] The valve core assembly is arranged in the accommodating cavity and inserted in the lower end of the magnetic rotor 100. The valve core assembly includes a valve stem 400 and a nut 500. The nut 500 is sleeved on the valve stem 400. The valve stem 400 is connected to the connecting plate 200.

[0043] The distance from the connection point between the connecting plate 200 and the magnetic rotor 100 to the upper end surface of the magnetic rotor 100 is configured as L1, the axial length of the magnetic rotor 100 is configured as L2, and the ratio of L1 to L2 is between 20% and 50%.

[0044] The technical solution of the present invention adjusts the connection position between the connecting plate 200 and the magnetic rotor 100 toward the axial middle of the magnetic rotor 100 to reduce the distance between the force point between the limit rod 300 and the stroke limit piece 600 and the connection point between the connecting plate 200 and the valve stem 400, that is, the center of gravity height of the magnetic rotor 100 is lowered, and the radial deflection effect of the limit rod 300 on the rotation of the magnetic rotor 100 due to the force of the stroke limit piece 600 is weakened. During the operation of the electronic expansion valve, the rotation center of the magnetic rotor 100 remains coincident with its geometric center, thereby avoiding the deflection of the magnetic rotor 100 and making the concentricity of the magnetic rotor 100 within a benign range to ensure the stability and reliability of the operation of the electronic expansion valve.

[0045] Among them, the valve core assembly is inserted into the lower end of the magnetic rotor 100, and the upper end of the nut 500 is synchronously inserted into the lower end of the magnetic rotor 100, that is, the abutment point between the limit rod 300 and the stroke limit member 600 is located inside the magnetic rotor 100. In order to ensure that the magnetic rotor 100 can stably drive the valve core assembly and avoid the stability of the upper and lower ends of the magnetic rotor 100 during rotation, the connecting plate 200 is connected to a position above the axial middle of the magnetic rotor 100. In this way, the maximum ratio of L1:L2 is 50%; similarly, in order to avoid the magnetic rotor 100 from swaying, the minimum ratio of L1:L2 is 20%. If the ratio of L1:L2 is greater than 20%, the magnetic rotor 100 is extremely prone to swaying during rotation, thereby causing the problem of poor concentricity.

[0046] It should be noted that the connecting plate 200 has a thickness in the vertical direction, that is, the plate thickness of the connecting plate 200. Thus, the connection between the connecting plate 200 and the magnetic rotor 100 in this embodiment is the connection between the connecting plate 200 in the vertical direction (that is, the plate thickness center of the connecting plate 200) and the inner peripheral wall of the magnetic rotor 100. Figure 2 As shown. In addition, all directional indications in the embodiments of the present invention, such as: upper end, lower end, upper side, lower side or top end, are used to indicate the positional relationship between the components in the state of the rotor assembly or electronic expansion valve represented by the drawings. Specifically, as described below: the magnetic rotor 100 is on the upper side of the nut 500, the valve port (not shown) is on the lower side of the valve stem 400, the connecting plate 200 is provided at the upper end of the magnetic rotor 100, and the upper end of the limit rod 300 is connected to the connecting plate 200, etc., are all based on the directional indications in the drawings.

[0047] In one embodiment, the magnetic rotor 100 is first connected to the connecting plate 200 to form a shape, and then the limiting rod 300 is connected to the connecting plate 200 to form a stroke rotor assembly, and then the valve stem 400 is connected and fixed to the connecting plate 200, and finally the housing 700 is covered. In this process, the nut 500 does not hinder the connection operation between the connecting plate 200 and the limiting rod 300, so that the limiting rod 300 can be stably welded to the connecting plate 200. In another embodiment, the magnetic rotor 100 is first connected to the connecting plate 200 to form a shape, and then the valve stem 400 is connected and fixed to the connecting plate 200, and then the limiting rod 300 is connected to the connecting plate 200 by riveting, clamping or screwing. In this process, the nut 500 does not hinder the connection operation between the connecting plate 200 and the limiting rod 300, so that the limiting rod 300 can be stably connected to the connecting plate 200. In this way, after adjusting the connection between the connecting plate 200 and the magnetic rotor 100 toward the axial middle of the magnetic rotor 100, the electronic expansion valve can still be assembled, thereby ensuring the stability and reliability of the operation of the electronic expansion valve.

[0048] In one embodiment, please refer to Figures 1 to 4 , the ratio of L1 to L2 is between 30% and 40%. It can be understood that the nut 500 of the valve core assembly is at the lower end of the magnetic rotor 100, and the connecting plate 200 needs to be located in the middle and upper part of the magnetic rotor 100 to ensure that the magnetic rotor 100 can rotate stably and drive the valve stem 400 to move stably, and can effectively avoid the occurrence of sway. In this way, the ratio of L1 to L2 is between 30% and 40%, which can improve the operating stability of the electronic expansion valve by stably rotating the center of gravity position of the magnetic rotor 100. Specifically, the ratio of L1: L2 can be 30%, 35% or 40%, etc. Of course, in other embodiments, the ratio of L1: L2 can also be 25% or 45%.

[0049] In one embodiment, please refer to Figures 1 to 4 , the magnetic rotor 100 includes a first magnetic ring 120 and a second magnetic ring 130, the valve core assembly is inserted into the second magnetic ring 130, the first magnetic ring 120 is arranged on the upper side of the second magnetic ring 130, and the connecting plate 200 is arranged on the second magnetic ring 130. It should be noted that in this embodiment, the magnetic rotor 100 is arranged separately, and the first magnetic ring 120 and the second magnetic ring 130 can be magnetized respectively, so as to better adapt to the magnetic environment and monitoring requirements in the electronic expansion valve. Without loss of generality, in this embodiment, the connection position of the connecting plate 200 and the second magnetic ring 130 is consistent with the connection position of the connecting plate 200 and the magnetic rotor 100 in the prior art. In this way, there is no need to change the original forming mold of the connecting plate 200 and the magnetic rotor 100. It is only necessary to lower the position of the second magnetic ring 130 and then arrange the first magnetic ring 120 above the second magnetic ring 130, thereby reducing the production cost and assembly difficulty. Of course, in other embodiments, the magnetic rotor 100 may be provided in an integrated manner, and the connecting plate 200 may be fixed to the inner circumferential wall of the magnetic rotor 100 by using a new mold.

[0050] Further, in this embodiment, please continue to refer to Figures 1 to 4, the lower end surface of the first magnetic ring 120 is provided with a first positioning slot 121, the upper end surface of the second magnetic ring 130 is provided with a second positioning slot 131, the notch of the first positioning slot 121 and the notch of the second positioning slot 131 are relatively abutted, and the magnetic rotor 100 is also provided with a positioning pin 140, and the two ends of the positioning pin 140 are respectively inserted into the first positioning slot 121 and the second positioning slot 131. It can be understood that in the process of installing the first magnetic ring 120 on the upper side of the second magnetic ring 130, the positioning pin 140 is first placed in the second positioning slot 131, at this time, the upper end of the positioning pin 140 is convex and exposed on the upper end surface of the second magnetic ring 130, and then, the first positioning slot is aligned and sleeved on the upper end of the positioning pin 140, so as to realize the placement of the first magnetic ring 120 on the upper side of the second magnetic ring 130. In this way, the positional relationship between the first magnetic ring 120 and the second magnetic ring 130 is accurately positioned, which is convenient for technicians to assemble the electronic expansion valve. In addition, the positioning pin 140 fixes the first magnetic ring 120 and the second magnetic ring 130 together to prevent relative movement between the first magnetic ring 120 and the second magnetic ring 130, thereby ensuring the stability of the magnetic rotor 100 during rotation. Of course, in other embodiments, a groove may be provided on the upper end surface of the second magnetic ring 130, and a convex portion may be provided on the lower end surface of the first magnetic ring 120. Through the mutual cooperation of the convex portion and the groove, the first magnetic ring 120 can be accurately placed on the upper side of the second magnetic ring 130, providing a positioning reference for technicians.

[0051] Further, in this embodiment, please continue to refer to Figures 1 to 4 , the first magnetic ring 120 and the second magnetic ring 130 are connected by gluing. It should be noted that after the magnetization of the first magnetic ring 120 and the second magnetic ring 130 is completed, the first magnetic ring 120 and the second magnetic ring 130 exhibit strong magnetism on their inner and outer sides, while the magnetism of the upper and lower end surfaces of the first magnetic ring 120 and the second magnetic ring 130 is weak, so that the first magnetic ring 120 and the second magnetic ring 130 can be stably connected together by gluing to ensure the stability of the magnetic rotor 100 during rotation. In addition, by gluing, the gap between the first magnetic ring 120 and the second magnetic ring 130 can be effectively reduced, reducing the vibration and noise during the operation of the rotor. This helps to improve the running stability of the electronic expansion valve and reduce potential noise interference. In addition, the gluing connection method is relatively simple and easy to implement, which can simplify the manufacturing process and installation process and improve production efficiency. Of course, in other embodiments, the first magnetic ring 120 and the second magnetic ring 130 can be connected by screwing, plugging or clamping.

[0052] In one embodiment, please refer to Figures 1 to 6The electronic expansion valve further includes a Hall sensor 800, which is arranged corresponding to the first magnetic ring 120, and the number of magnetic poles of the first magnetic ring 120 is greater than the number of magnetic poles of the second magnetic ring 130. It should be noted that the electronic expansion valve has a function of monitoring the rotation stability of the magnetic rotor 100 to determine whether the magnetic rotor 100 is blocked. In this embodiment, the magnetic rotor 100 needs to have at least two functions, one is to cooperate with the coil to drive the valve stem 400 to move; the other is that after the coil applies an electric pulse, the magnetic rotor 100 provides a Hall signal to the Hall sensor 800 to determine whether the magnetic rotor 100 is blocked. In this way, the first magnetic ring 120 and the second magnetic ring 130 are magnetized respectively, and the number of magnetic poles of the first magnetic ring 120 is greater than the number of magnetic poles of the second magnetic ring 130, and the first magnetic ring 120 is set corresponding to the Hall sensor 800, so that the Hall sensor 800 can sense a greater magnetic field change at the corresponding position, making the Hall sensor 800 more sensitive, so as to accurately determine whether the magnetic rotor 100 is blocked, thereby achieving precise control of the electronic expansion valve and improving the responsiveness and adjustment performance of the valve stem 400 to the valve port. Of course, in other embodiments, the number of magnetic poles of the first magnetic ring 120 can also be consistent with the number of magnetic poles of the second magnetic ring 130.

[0053] Further, in this embodiment, please refer to Figures 4 to 6 , the number of magnetic poles of the first magnetic ring 120 is 2nN, and the number of magnetic poles of the second magnetic ring 130 is N. It can be understood that the number of magnetic poles of the first stimulus is an integer multiple of the number of magnetic poles of the second magnetic ring 130, and is an even multiple, so that the Hall sensor 800 can more accurately determine whether the magnetic rotor 100 is blocked. Specifically, the number of magnetic poles of the second magnetic ring 130 is configured to be 24, and if the number of magnetic poles of the first magnetic ring 120 is also 24, when 4 electrical pulses pass through the coil, the first magnetic ring 120 provides 1 Hall signal to the Hall sensor 800. In this embodiment, the number of magnetic poles of the first magnetic ring 120 is configured to be 4 times the number of magnetic poles of the second magnetic ring 130, that is, the number of magnetic poles of the first magnetic ring 120 is 96. In this way, only one electrical pulse needs to be applied to the coil, and the first magnetic ring 120 can provide 1 Hall signal to the Hall sensor 800. In this way, the Hall sensor 800 can more sensitively identify the rotation of the magnetic rotor 100, thereby accurately determining whether the magnetic rotor 100 is blocked, and providing position feedback, thereby improving the reliability of the electronic expansion valve. Of course, in other embodiments, the number of magnetic poles of the first magnetic ring 120 can also be an odd multiple of the number of magnetic poles of the second magnetic ring 130.

[0054] In one embodiment, please refer to Figure 1 and Figure 7, the connecting plate 200 is connected to the magnetic rotor 100 by an injection molding process. It can be understood that the injection molding process can use high-strength materials to provide sufficient strength for the connecting plate 200, so that it can withstand the movement of the magnetic rotor 100 and the force applied by the limit rod 300, ensure the connection stability and reliability of the connecting plate 200 and the magnetic rotor 100, and reduce the risk of the connecting plate 200 loosening or falling off. In addition, the injection molding process can achieve a close fit between the connecting plate 200 and the magnetic rotor 100, and the connecting plate 200 can fully adapt to the shape and size of the magnetic rotor 100 to achieve a tighter connection, thereby improving the operating efficiency of the electronic expansion valve. In addition, the injection molding process can be customized according to specific needs, so that the shape, size and special functions of the connecting plate 200 can also be customized as needed, providing better adaptability and functionality. At the same time, the injection molding process is generally an economical and efficient production method, which can mass-produce the connecting plate 200 in a short period of time, thereby reducing manufacturing costs and improving production efficiency. Of course, in other embodiments, the connecting plate 200 may also be connected to the inner circumferential wall of the magnetic rotor 100 by means of snap connection, plug connection or screw connection.

[0055] Further, in this embodiment, please continue to refer to Figure 1 and Figure 7 , the inner circumference of the magnetic rotor 100 is provided with a limiting ring groove 110, and the outer circumference of the connecting plate 200 is embedded in the limiting ring groove 110. The design of the limiting ring groove 110 can make the connecting plate 200 firmly locked on the magnetic rotor 100 to prevent it from relative displacement during movement, thereby ensuring the connection stability between the magnetic rotor 100 and the connecting plate 200. In addition, the precise fit between the connecting plate 200 and the limiting ring groove 110 ensures the accurate position of the connecting plate 200, so that the connecting plate 200 can be accurately placed at the required position to connect with the magnetic rotor 100, which is convenient for technicians to perform injection molding operations. Of course, in other embodiments, the inner circumference of the magnetic rotor 100 can be surrounded and spaced to form a card protrusion, and the outer circumference of the connecting plate 200 forms a card groove corresponding to the card protrusion during the injection molding process to ensure the connection stability between the connecting plate 200 and the magnetic rotor 100.

[0056] In one embodiment, please refer to Figure 1 and Figure 7The connection plate 200 is connected to the limit rod 300, the upper end of the limit rod 300 is connected to the connection plate 200 by welding or riveting, and the limit rod 300 cooperates with the travel limiter 600 on the nut 500 to limit the range of motion of the valve stem 400. The range of motion of the valve stem 400 can be limited by the cooperation between the limit rod 300 and the travel limiter 600 on the nut 500. When the valve stem 400 reaches a predetermined limit position, the travel limiter 600 interacts with the limit rod 300 to prevent the valve stem 400 from moving further, thereby ensuring that the valve works within the set position range, preventing the valve port from being opened or closed excessively or causing damage to the components inside the electronic expansion valve. In addition, the connection stability and durability of the connection plate 200 and the limit rod 300 can be ensured by welding or riveting, so as to ensure the stability and reliability of the operation of the electronic expansion valve.

[0057] The present invention also proposes a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above-mentioned embodiment. Since the refrigeration device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0058] The present invention also proposes a vehicle, which includes a refrigeration device. The specific structure of the refrigeration device refers to the above-mentioned embodiment. Since the vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0059] 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. An electronic expansion valve, characterized in that: include: A housing having an accommodating cavity therein; A magnetic rotor is disposed in the accommodating cavity, wherein the magnetic rotor is a hollow structure, and a connecting plate is connected to an inner peripheral wall thereof; and A valve core assembly is arranged in the accommodating cavity and inserted in the lower end of the magnetic rotor, the valve core assembly comprises a valve stem and a nut, the nut is sleeved on the valve stem, and the valve stem is connected to the connecting plate; The distance between the connection point between the connecting plate and the magnetic rotor and the upper end surface of the magnetic rotor is configured as L1, the axial length of the magnetic rotor is configured as L2, and the ratio of L1 to L2 is between 20% and 50%.

2. The electronic expansion valve according to claim 1, characterized in that: The ratio of L1 to L2 is between 30% and 40%.

3. The electronic expansion valve according to claim 1, characterized in that: The magnetic rotor includes a first magnetic ring and a second magnetic ring, the valve core assembly is inserted into the second magnetic ring, the first magnetic ring is arranged on the upper side of the second magnetic ring, and the connecting plate is arranged on the second magnetic ring.

4. The electronic expansion valve according to claim 3, characterized in that: The lower end surface of the first magnetic ring is provided with a first positioning slot, and the upper end surface of the second magnetic ring is provided with a second positioning slot. The notch of the first positioning slot and the notch of the second positioning slot are relatively abutted. The magnetic rotor is also provided with a positioning pin, and the two ends of the positioning pin are respectively inserted into the first positioning slot and the second positioning slot.

5. The electronic expansion valve according to claim 3, characterized in that: The first magnetic ring and the second magnetic ring are connected by gluing.

6. The electronic expansion valve according to claim 3, characterized in that: The electronic expansion valve further includes a Hall sensor, which is disposed corresponding to the first magnetic ring, and the number of magnetic poles of the first magnetic ring is greater than the number of magnetic poles of the second magnetic ring.

7. The electronic expansion valve according to claim 6, characterized in that: The number of magnetic poles of the first magnetic ring is 2nN, and the number of magnetic poles of the second magnetic ring is N.

8. The electronic expansion valve according to claim 1, characterized in that: The connecting plate is connected to the magnetic rotor through an injection molding process.

9. The electronic expansion valve according to claim 8, characterized in that: The inner circumference of the magnetic rotor is provided with a limiting ring groove, and the outer circumference of the connecting plate is embedded in the limiting ring groove.

10. The electronic expansion valve according to any one of claims 1 to 9, characterized in that: The connection plate is connected to a limit rod, the upper end of the limit rod is connected to the connection plate by welding or riveting, and the limit rod cooperates with a travel limiter on the nut to limit the movement range of the valve stem.

11. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 10.

12. A vehicle, characterized in that: Comprising the refrigeration device as claimed in claim 11.

Images