Electronic expansion valve

Abstract

The electronic expansion valve provided by the present invention optimizes the design of the structure of the electronic expansion valve, including a valve needle and a magnetic component. The magnetic component includes a first magnetic part and a second magnetic part. The first magnetic part is fixedly connected or limitedly connected to the guide seat, and the second magnetic part is fixedly connected or limitedly connected to the valve needle. The valve needle is subject to the magnetic repulsion force generated by the magnetic component and has a tendency to always move away from the valve port part, which can relatively ensure the actuation reliability of the electronic expansion valve.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration control, and more particularly to an electronic expansion valve. Background Art

[0002] The variable-frequency air-conditioning decelerating electronic expansion valve mainly consists of two parts. One part is the valve body part for flow regulation, and the other part is the coil part for driving, which includes an opening control mechanism, an elastic element, a transmission mechanism, a deceleration mechanism, a driving component, etc. The operating principle is that when the coil is energized, an electromagnetic force is generated to drive the rotor to rotate. The rotation of the rotor is decelerated by a deceleration device, and then the transmission mechanism converts the rotation into a linear motion and transmits it to the opening control mechanism, so that the valve needle moves axially up and down to approach or move away from the valve port, thereby controlling the opening of the valve. The elastic element usually adopts a compression spring and is always in a compressed state inside the valve body. The generated compression force makes the valve needle tend to move in the valve-opening direction. Summary of the Invention

[0003] The main object of the present invention is to provide a new structure of an electronic expansion valve, which can also make the valve needle always tend to move in the valve-opening direction.

[0004] To achieve the above object, an electronic expansion valve is provided. The electronic expansion valve is characterized by comprising a valve body, a valve port part and a guide seat. The valve body is fixedly connected to the valve port part or is an integral structure. The guide seat is fixedly connected to the valve body. The guide seat has a guide hole. The electronic expansion valve further comprises a valve needle and a magnetic component. The guide hole is adapted to the valve needle and the valve needle can approach or move away from the valve port part. The magnetic component includes a first magnetic part and a second magnetic part. The first magnetic part is fixedly connected or limitedly connected to the guide seat. The second magnetic part is fixedly connected or limitedly connected to the valve needle. The first magnetic part and the second magnetic part are arranged opposite to each other, and the end faces of the first magnetic part and the second magnetic part arranged opposite to each other have the same magnetic poles.

[0005] The electronic expansion valve provided by the present invention optimizes the structure of the electronic expansion valve, including a valve needle and a magnetic component. The magnetic component includes a first magnetic part and a second magnetic part. The first magnetic part is fixedly connected or limitedly connected to the guide seat. The second magnetic part is fixedly connected or limitedly connected to the valve needle. The first magnetic part and the second magnetic part are arranged opposite to each other, and the end faces of the first magnetic part and the second magnetic part arranged opposite to each other have the same magnetic poles. The valve needle is subject to the magnetic repulsive force generated by the magnetic component and has a tendency to always move in the direction away from the valve port part. Brief Description of the Drawings

[0006] The accompanying drawings of the specification, which form a part of the present application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0007] Figure 1 is an overall cross-sectional view of the electronic expansion valve provided by the present invention;

[0008] Figure 2 is an enlarged view of the valve body part of the first embodiment of the electronic expansion valve provided by the present invention;

[0009] Figure 3 is a three-dimensional schematic diagram of the magnetic component of the electronic expansion valve provided by the present invention; Detailed implementation manners

[0010] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0011] Such as Figure 1 and Figure 2The following details the first embodiment of the electronic expansion valve provided by the present invention. The electronic expansion valve includes a valve body 1 and a valve port part 2. The valve port part 2 is provided with a valve port 21. The valve body 1 is fixedly connected to the valve port part 2 or the two can also be an integral structure. When the valve body 1 is an integral structure, the valve port can be directly provided on the valve body 1. A first connection interface is provided on the side wall of the valve body, and a second connection interface is provided on the valve port part 2. The electronic expansion valve further includes a first connecting pipe 10 and a second connecting pipe 20. Among them, the first connecting pipe 10 is fixedly connected to the first connection interface, and the second connecting pipe 20 is fixedly connected to the second connection interface. The electronic expansion valve has a valve cavity A. The refrigerant can enter the valve cavity A from the first connecting pipe 10 and flow out of the second connecting pipe 20 through the valve port, or conversely, the refrigerant can enter the valve cavity A from the second connecting pipe 20 and flow out of the first connecting pipe 10 through the valve port. It also includes a guide seat 3, a valve needle 4, and a transmission component 6. The guide seat 3 is fixedly connected to the valve body 1. The guide seat 3 has a guide hole 31. The guide hole 31 is adapted to the valve needle 4 and the valve needle 4 extends into the valve cavity A through the guide hole 31. The transmission component 6 includes a nut 61 and a lead screw 62. Through the threaded cooperation of the nut 61 and the lead screw 62, the valve needle 4 can be moved downward to approach the valve port to adjust the refrigerant flow rate flowing through the valve port. The electronic expansion valve further includes a magnetic component 5. The magnetic component 5 includes a first magnetic part 51 and a second magnetic part 52. The first magnetic part 51 is embedded with the guide seat 3, or the first magnetic part can also be directly located on the end face of the guide seat 3 and abutted against it, or the first magnetic part can also be bonded to the guide seat 3, or the first magnetic part can also be press-fitted into the guide seat 3 in a slightly interference fit manner. Similarly, the second magnetic part 52 can be embedded with the valve needle 4, or the second magnetic part can also be bonded to the valve needle 4, or the second magnetic part can also be press-fitted into the valve needle 4 in a slightly interference fit manner, so as to realize the fixed connection or limit connection between the first magnetic part and the guide seat, and the fixed connection or limit connection between the second magnetic part and the valve needle. The first magnetic part 51 and the second magnetic part 52 are arranged facing each other, and the end faces of the first magnetic part 51 and the second magnetic part 52 arranged facing each other have the same magnetic poles. The electronic expansion valve has an open valve state and a closed valve state. When the closed valve state is required, through the threaded cooperation of the nut 61 and the lead screw 62, the lead screw 62 presses against the valve needle 4 to move it downward to overcome the magnetic repulsive force generated by the magnetic component 5 until the valve needle 4 abuts against the valve port 21. When the open valve state is required, the valve needle is no longer pressed by the lead screw 62. The valve needle 4 is pushed by the magnetic repulsive force to move away from the valve port. The valve needle 4 is relatively far away from the valve port 21. Therefore, whether in the open valve or closed valve state, the valve needle 4 is always pushed by the magnetic repulsive force generated by the magnetic component 5 to move away from the valve port. Especially when the electronic expansion valve actuates from the closed valve state to the open valve state, the valve needle 4 is pushed by the magnetic repulsive force generated by the magnetic component 5 to move away from the valve port for smooth valve opening actuation.Through the optimized design of the electronic expansion valve structure, the above structure adds a magnetic component 5 to replace the traditional compression spring. By generating magnetic repulsion force, the differential pressure force received by the valve needle can be offset. The repulsion force received by the valve needle is relatively uniform, which can relatively reduce the situation that the valve needle deflects due to the fatigue deformation of the traditional spring component. Different from the spring, the magnetic repulsion force generated by the magnetic component will not decay as the valve operates. That is, at the same working position, the magnetic repulsion force received by the valve needle can remain relatively unchanged, and it has a longer service life than the spring.

[0012] Further, the guiding seat 3 includes a body section 32 and a conical section 33. A guiding hole 31 is formed in the conical section 33. The body section 32 includes a first body section 321 and a second body section 322. The inner diameter of the first body section 321 is larger than that of the second body section 322, and the inner diameter of the second body section 322 is larger than the inner diameter of the conical section 33, i.e., the diameter of the guiding hole 31. A step surface 322a is formed between the first body section 321 and the second body section 322. The electronic expansion valve further includes a receiving cavity B. The nut 61 is press-fitted into the receiving cavity B. The upper end of the first body section 321 has a deformed portion 3211. The deformed portion 3211 limits the nut 61 in the receiving cavity B through riveting deformation. The nut 61 abuts against the step surface 322a, so that the nut 61 is integrally limited and fixed to the guiding seat 3. The valve needle 4 has a valve needle body and a flange 41. The flange 41 can perform axial lifting movement along the inner wall of the second body section 322. The conical section 33 includes an end surface 331. The end surface 331 is provided with a first groove 3311. The first magnetic part 51 is fitted into the first groove 3311 or the first magnetic part 51 can be press-fitted into the first groove 3311 by a slight interference fit. Specifically, the first magnetic part 51 can be an annular permanent magnet component and can have an interference fit or a small clearance fit with the groove wall of the first groove 3311. The lower end of the flange 41 is provided with a second groove 411. The second magnetic part 52 is fitted into the second groove 411. Specifically, the second magnetic part 52 can be an annular permanent magnet component and can have an interference fit or a small clearance fit with the groove wall of the second groove 411. In order to generate a better magnetic repulsion effect, the height of the first magnetic part 51 is greater than the depth of the first groove 3311, and the height of the second magnetic part 52 is greater than the depth of the second groove 411. The first magnetic part and the second magnetic part are both permanent magnet rings. For the magnetic component 5 made of natural magnet, its magnetism can be almost permanently preserved, and it has a longer service life compared with the traditional compression spring. Further, the first magnetic part 51 includes a first end surface 511 and a second end surface 512, and the second magnetic part 52 includes a third end surface 521 and a fourth end surface 522. The first end surface 511 and the third end surface 521 face each other and the first end surface 511 and the third end surface 521 are both the same magnetic pole, such as the S pole. The second end surface 512 and the fourth end surface 522 are the same magnetic pole. According to the characteristic of like poles of magnets repelling each other, the first magnetic part and the second magnetic part generate magnetic repulsion, which can make the valve needle have a tendency to always move away from the valve port. To ensure a better magnetic repulsion effect, the central axis of the first magnetic part 51 is collinear with the central axis of the second magnetic part 52.

[0013] The following briefly introduces the second embodiment of the electronic expansion valve provided by the present invention. The difference from the first embodiment lies in the change in the fitting method of the magnetic component 5. In this embodiment, the upper part of the conical section 33 has an annular first end face protrusion, and the first magnetic part 51 is sleeved on the outer periphery of the first end face protrusion so that the first magnetic part 51 is generally positioned on the guide seat 3. Below the flange 41, there is a first lower protrusion, and the second magnetic part 52 is sleeved on the outer periphery of the first lower protrusion. In order to generate a better magnetic repulsion force, the height of the first magnetic part 52 is greater than the height of the first end face protrusion, and the height of the second magnetic part 52 is greater than the height of the first lower protrusion. The relevant technical effects have been specifically described in the first embodiment and will not be elaborated here one by one.

[0014] The following briefly introduces the third embodiment of the electronic expansion valve provided by the present invention. In this embodiment, the fitting method of the magnetic component 5 also changes. The upper part of the conical section 33 has a second end face protrusion, the first magnetic part 51 is sleeved inside the second end face protrusion, below the flange 41, there is a second lower protrusion, and the second magnetic part 52 is sleeved inside the second lower protrusion. In order to generate a better magnetic repulsion force, the height of the first magnetic part is greater than the second end face protrusion, and the height of the second magnetic part is greater than the second lower protrusion. The relevant technical effects have been specifically described in the first embodiment and will not be elaborated here one by one.

[0015] As Figure 1Briefly introduce other components of the electronic expansion valve and its actuation principle as shown in the figure. The electronic expansion valve further includes a housing 7, a drive component 8, and a planetary reduction gear device 9. The housing 7 is fixedly connected to the valve body 1 to generally define the valve cavity A of the electronic expansion valve. The drive component 8 includes a coil sleeved on the outer peripheral part of the housing 7 and a rotor assembly 8 built in the valve cavity A. There is also a top frame mechanism 100 above the rotor assembly 8. The rotor assembly 8 includes a rotor 81 and a connecting seat 82, which are integrally injection molded. The planetary gear reduction device 9 includes a sun gear 91, planetary gears 92, a planet carrier 93, and a fixed gear 94. The electronic expansion valve further includes a sleeve 200. The fixed gear 94 is integrally injection molded with the sleeve 200. The sun gear 91 is integrally formed with the connecting seat 82. The planet carrier 93 is provided with a plurality of mounting shafts, and the planetary gears 92 are sleeved on the mounting shafts. The drive component 8 serves as the input end of the planetary gear reduction mechanism. Due to the excitation of the coil of the drive component, the rotor rotates to drive the sun gear 91 to rotate, and then drives the planetary gears to rotate along their own axes. Through the meshing action between the planetary gears 92 and the fixed gear 94, the planetary gears 92 revolve along the axis of the sleeve 200, and finally drive the planet carrier 93 to rotate around its own axis. The planet carrier 93 also has an output shaft 931 integrally formed with the planet carrier 93. Therefore, the output shaft 931 can rotate along its own axis. The output shaft 931 is further matched with the transmission mechanism 6. In the structure of the electronic expansion valve provided by the present invention, the output shaft 931 is integrally injection molded on the lead screw 62. When the output shaft 931 rotates, the lead screw 62 also rotates synchronously. Through the threaded engagement with the nut 61, the valve needle 4 moves relatively closer to or away from the valve port 21 to adjust the refrigerant flow rate through the valve port.

[0016] It should be noted that the key point of the electronic expansion valve provided by the present invention lies in the change of the guide seat and the valve needle structure, and a magnetic component is added to replace the traditional compression spring. There are other alternative ways for other components such as the drive component and the transmission component.

[0017] Through the optimized design of the electronic expansion valve structure, a magnetic component 5 is added to replace the traditional compression spring. By generating a magnetic repulsive force, the pressure difference force received by the valve needle can be offset. The repulsive force received by the valve needle is relatively uniform, which can relatively reduce the situation of valve needle deflection caused thereby. Compared with the spring, the magnetic repulsive force generated by the magnetic component will not decay like the spring as the valve operates. That is, at the same working position, the magnetic repulsive force received by the valve needle can remain relatively unchanged, and it has a longer service life than the spring.

[0018] It should be further noted that the ordinal numbers such as "first" and "second" or the orientation words such as "upper" and "lower" mentioned in the present invention are introduced for the convenience of description based on the accompanying drawings of the specification, and there are no restrictions on any order or orientation. The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that, It includes a valve body, a valve port part and a guide seat. The valve body is fixedly connected to the valve port part or is an integral structure. The guide seat is fixedly connected to the valve body. The guide seat has a guide hole. The electronic expansion valve further includes a valve needle and a magnetic component. The guide hole is adapted to the valve needle and the valve needle can approach or move away from the valve port part. The magnetic component includes a first magnetic part and a second magnetic part. The first magnetic part is fixedly connected or limitedly connected to the guide seat. The second magnetic part is fixedly connected or limitedly connected to the valve needle. The first magnetic part and the second magnetic part are arranged facing each other and the end faces of the first magnetic part and the second magnetic part arranged facing each other have the same magnetic poles. Both the guide seat and the valve needle are provided with grooves, and the first magnetic part and the second magnetic part are respectively embedded in the grooves; or both the guide seat and the valve needle are provided with protrusions, and the first magnetic part and the second magnetic part are respectively sleeved outside the protrusions. The guide seat includes a body section. The body section includes a first body section and a second body section. A step surface is formed between the first body section and the second body section. The electronic expansion valve includes a receiving cavity. The electronic expansion valve further includes a transmission component. The transmission component includes a nut and a lead screw. Through the threaded cooperation of the nut and the lead screw, the valve needle can be pushed downward to approach the valve port part. The nut is press-fitted into the receiving cavity. The first body section has a deformed part. The deformed part fixes the nut in the receiving cavity by riveting deformation. The nut abuts against the step surface.

2. The electronic expansion valve according to claim 1, wherein, The guide seat includes a body section and a conical section. The conical section includes an end face. The end face is provided with a first groove. The first magnetic part is embedded in the first groove. The valve needle has a flange part. The flange part is provided with a second groove. The second magnetic part is embedded in the second groove.

3. The electronic expansion valve according to claim 2, wherein, The height of the first magnetic part is greater than the depth of the first groove. The height of the second magnetic part is greater than the depth of the second groove.

4. The electronic expansion valve according to claim 1, wherein The guide seat includes a body section and a conical section. The conical section includes an end face. The upper part of the conical section has a first end face protrusion. The first magnetic part is sleeved outside the outer peripheral part of the end face protrusion. The valve needle has a flange part. Below the flange part, there is a first lower protrusion. The second magnetic part is sleeved outside the lower protrusion.

5. The electronic expansion valve according to claim 4, characterized in that The height of the first magnetic part is greater than the height of the first end face protrusion. The height of the second magnetic part is greater than the height of the first lower protrusion.

6. The electronic expansion valve according to claim 1, wherein The guide seat includes a body section and a conical section. The conical section includes an end face. The upper part of the conical section has a second end face protrusion. The first magnetic part is sleeved inside the second end face protrusion. The valve needle has a flange part. Below the flange part, there is a second lower protrusion. The second magnetic part is sleeved inside the second lower protrusion.

7. The electronic expansion valve according to claim 6, wherein The height of the first magnetic part is greater than the second end face protrusion. The height of the second magnetic part is greater than the second lower protrusion.

8. The electronic expansion valve according to any one of claims 2-7, characterized in that, The valve needle has a flange part. The flange part can perform axial lifting and lowering movement along the inner wall of the second body section.

9. The electronic expansion valve according to any one of claims 1-7, characterized in that, The first magnetic part includes a first end face and a second end face, the second magnetic part includes a third end face and a fourth end face, the first end face and the third end face face each other and have the same magnetic pole, the second end face and the fourth end face have the same magnetic pole, the central axis of the first magnetic part and the central axis of the second magnetic part are collinear, and the first magnetic part and the second magnetic part are permanent magnet rings.

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