Electronic expansion valve
Through the separation design of the screw and the valve core assembly, the electronic expansion valve is easy to assemble and stable pass-through angle setting, solving the problems of complex assembly and inconvenient angle setting in the prior art, and reducing the risk of valve core wear and leakage.
Patent Information
- Application Number
- CN202422404634.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The assembly process of existing electronic expansion valves is complicated and the setting of the pass angle is inconvenient.
The screw is separated from the valve core assembly. The screw has transmission, stop and connection functions. The pass-through angle is set by rotating the screw and the magnetic rotor synchronously, and the valve core does not rotate to reduce wear.
Simplifies the assembly process, stabilizes the pass angle setting, and reduces the risk of spool wear and leakage.
Smart Images
Figure CN223153802U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a valve, in particular to an electronic expansion valve. Background Art
[0002] The electronic expansion valve is an important component in the cooling / heating system, mainly used to control the flow of the refrigerant fluid. The electronic expansion valve includes a valve seat, a nut, a magnetic rotor, a screw, a valve core assembly, a valve housing and other components. The existing electronic expansion valve assembly process is complicated, and it is also inconvenient to set the clearance angle. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide an electronic expansion valve which is easy to assemble and easy to set the closing angle.
[0004] The utility model provides an electronic expansion valve, including a valve seat, a nut, a magnetic rotor, a screw and a valve core assembly; the valve seat is provided with a valve port, the nut is fixed on the valve seat, and the magnetic rotor is rotatably arranged on the outside of the nut; the screw comprises a screw shaft and a stopper; the lower part of the screw shaft extends into the nut, the outer wall of the lower part of the screw shaft is provided with an external thread, and the external thread is spirally connected with the internal thread of the nut; the stopper is fixed to the upper part of the screw shaft and is connected to the magnetic rotor so that the screw rotates synchronously with the magnetic rotor; the stopper is provided with a rotation-stopping portion extending toward the nut, and the nut is provided with a A stopper portion is used to cooperate with the anti-rotation portion to prevent the screw from rotating; the valve core assembly includes a valve stem, a valve core and an elastic element, the valve core has an inner cavity, the elastic element is arranged in the inner cavity and abuts the valve core; the upper part of the valve stem is connected to the screw rod body, and the lower part of the valve stem is inserted into the inner cavity of the valve core in a manner that it can rotate relatively and move axially but cannot be detached, and abuts the elastic element; when the valve core does not abut the valve port, the valve core moves synchronously with the valve stem; when the valve core abuts the valve port and cannot continue to move, the valve stem can overcome the elastic force of the elastic element and move toward the valve port until the anti-rotation portion abuts the stopper portion.
[0005] The utility model embodiment has at least the following advantages:
[0006] 1. The screw rod of the embodiment of the utility model has the functions of transmission, stopping and connection at the same time. This structure is conducive to adjusting the assembly sequence of the screw rod, the magnetic rotor and the valve core assembly. According to the convenience of the assembly process, it is possible to choose to first fix the valve core assembly and the screw rod or the magnetic rotor and the screw rod, thereby simplifying the assembly process;
[0007] 2. The screw and the valve core assembly of the embodiment of the present utility model adopt a separated design. During the assembly process, the corresponding passing angle can be set only by rotating the magnetic rotor or the screw with the valve core in a non-rotating state, and then the screw and the valve core assembly are fixedly connected. This can make the setting of the passing angle convenient to operate, simplify the setting process of the passing angle, and make the passing angle more stable. During this process, the valve core does not rotate, so that the wear between the valve core and the valve port can be reduced, and the leakage risk can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 Fig. shows a cross-sectional schematic view of an electronic expansion valve according to an embodiment of the present utility model, wherein the valve core abuts against the valve port and the electronic expansion valve is in a closed state.
[0009] Figure 2 Fig. shows a cross-sectional schematic view of a nut according to an embodiment of the present utility model.
[0010] Figure 3 Fig. shows a three-dimensional schematic view of a screw according to an embodiment of the present utility model.
[0011] Figure 4 Fig. shows a three-dimensional schematic view of a magnetic rotor according to an embodiment of the present utility model.
[0012] Figure 5 and Figure 6 Figs. respectively show two different ways of adjusting the passing angle of an electronic expansion valve according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0014] Please refer to Figures 1 to 4 . An electronic expansion valve according to an embodiment of the present utility model includes a valve seat 1, a nut 2, a magnetic rotor 3, a screw 4, a valve core assembly 5, a return spring 6 and a housing 7.
[0015] The valve seat 1 is provided with a first interface 11, a second interface 12 and a third interface 13, and a valve port 10 is provided at the third interface 13. The refrigerant fluid flowing into the first interface 11 and the second interface 12 flows into the third interface 13 through the valve port 10.
[0016] The nut 2 is fixed on the valve seat 1, and the connection methods include but are not limited to welding, riveting, etc. In this embodiment, a first annular groove 21 is provided on the outer side surface of the nut 2, and an installation ring 22 is installed in the first annular groove 21. The installation ring 22 is integrally formed with the nut 2 and is connected to the valve seat 1 by welding, riveting, etc. The inner wall of the nut 2 is provided with an internal thread 23, and a stop portion 24 is provided at the top end of the nut 2. The stop portion 24 is a convex platform protruding upward. Optionally, the nut 2 is made of a plastic part, and the installation ring 22 is made of a metal part.
[0017] The magnetic rotor 3 is rotatably arranged on the outside of the nut 2. The magnetic rotor 3 includes a magnetic rotor body 31 and a connecting piece 32. The magnetic rotor body 31 can rotate by inducing the electromagnetic force of the electromagnetic coil. The magnetic rotor body 31 has a central hole 310 that passes through in the axial direction, and the connecting piece 32 is connected to the inner wall of the magnetic rotor body 31, and the connection method includes but is not limited to welding, riveting, integral molding and the like. In this embodiment, the inner wall of the magnetic rotor body 31 is provided with a second annular groove 312, and the annular connecting piece 32 is installed in the second annular groove 312 and is integrally formed with the magnetic rotor body 31. Optionally, the connecting piece 32 is made of metal material.
[0018] The screw 4 includes a screw shaft 41 and a limit member 42. The lower part of the screw shaft 41 extends into the nut 2, and the outer wall of the lower part of the screw shaft 41 is provided with an external thread 413, and the external thread 413 is spirally connected to the internal thread 23 of the nut 2. The limit member 42 is fixed to the upper part of the screw shaft 41, and is connected to the connecting member 32 of the magnetic rotor 3, so that the screw 4 rotates synchronously with the magnetic rotor 3. The connection method between the limit member 42 and the connecting member 32 includes but is not limited to welding and the like. The limit member 42 is provided with a stop portion 424 extending toward the nut 2. In the present embodiment, the limit member 42 is a limit convex ring extending radially from the outer peripheral surface of the screw shaft 41, and the limit member 42 is integrally formed with the screw shaft 41, thereby reducing the number of parts and simplifying the assembly process.
[0019] The valve core assembly 5 includes a valve stem 51, a valve core 52 and an elastic element 53. The valve core 52 includes a valve core body 521 and a top cover 522. The valve core body 521 has a cavity 5210 that opens upward. The top cover 522 covers the cavity 5210 and is connected to the valve core body 521. The connection method includes but is not limited to welding, riveting, etc. The top cover 522 and the valve core body 521 jointly define an inner cavity 523. The top cover 522 can be an independent part, or it can be integrally formed with the valve core body 521. The bottom of the valve core body 521 is in an inverted cone shape to match the valve port 10 and control the opening of the valve port 10. The elastic element 53 is arranged in the inner cavity 523 and abuts the valve core 52. In this embodiment, the elastic element 53 is a spring, and the spring abuts the bottom surface of the inner cavity 523 of the valve core 52.
[0020] The upper part of the valve stem 51 is connected to the screw rod body 41. In the example shown in the figure, the screw rod body 41 has a central through hole 410 extending axially. The upper part of the valve stem 51 passes through the central through hole 410 of the screw rod body 41 and is connected to the screw rod body 41. The connection methods include but are not limited to welding, riveting, etc. In other embodiments, the screw rod body 41 can also be a solid rod (i.e., without a central through hole 41), and the top of the valve stem 51 is connected to the bottom of the screw rod body 41 by welding or other means. The screw 4 of this embodiment has the functions of transmission, stopping, and connection at the same time. According to the convenience of the assembly process, it can be selected to connect the screw 4 to the valve core assembly 5 first or connect the screw 4 to the magnetic rotor 3 first, so as to simplify the assembly process.
[0021] The lower part of the valve stem 51 is inserted into the inner cavity of the valve core 52 in a manner that can rotate relative to each other and move axially but cannot be detached, and abuts against the elastic element 53. In this embodiment, the lower part of the valve stem 51 passes through the top cover part 522 and extends into the inner cavity 523. A pressure ring 513 extending radially is provided at the bottom of the valve stem 51, and the pressure ring 513 abuts against the elastic element 53. The top cover part 522 has a limiting effect on the pressure ring 513, which can prevent the lower part of the valve stem 51 from detaching from the valve core 52. In the example shown in the figure, the pressure ring 513 is in the shape of a bushing, sleeved outside the rod body of the valve stem 51, and is connected to the valve stem 51 by welding, riveting, etc. In other embodiments, the pressure ring 513 can also be integrally formed with the valve stem 51.
[0022] The return spring 6 is sleeved outside the screw rod body 41, and the bottom end of the return spring 6 abuts against the limiting part 42.
[0023] The bottom end of the housing 7 is connected to the valve seat 1, and the connection methods include but are not limited to welding, riveting, etc. The housing 7 covers the nut 2, the magnetic rotor 3, the screw 4, the valve core assembly 5, and the return spring 6.
[0024] When the electronic expansion valve switches from the open state to the closed state, the electromagnetic coil (not shown in the figure) of the electronic expansion valve is energized to generate a magnetic field. The magnetic rotor 3 rotates in the first direction under the action of the magnetic field, and drives the screw 4 and the valve stem 51 to rotate synchronously. Since the screw 4 is helically connected to the nut 2, the screw 4 will also move axially downward while rotating, and drive the magnetic rotor 3 and the valve stem 51 to move axially together. When the valve core 52 does not abut against the valve port 10 (i.e., the electronic expansion valve is in the open state), under the action of gravity, the valve core 52 presses on the pressure ring 513 of the valve stem 51, and the valve core 52 moves synchronously with the valve stem 51. The valve core 52 can control the flow area of the valve port and thus control the flow rate. When the valve core 52 abuts against the valve port 10 (the electronic expansion valve is just in the closed state), as Figure 1As shown, the valve stem 51 can continue to move towards the valve port 10 against the elastic force of the elastic element 53 until the anti-rotation portion 424 provided on the position-limiting member 42 abuts against the stop portion 24 provided on the nut 2. The function of the stop portion 24 is to cooperate with the anti-rotation portion 424 by abutting to prevent the screw 4 from rotating. When the stop portion 24 abuts against the anti-rotation portion 424, the screw 4 and the valve stem 51 can no longer rotate and can no longer continue to move axially downward. From the time when the valve core 52 abuts against the valve port 10 and cannot move further until the stop portion 24 abuts against the anti-rotation portion 424, the angle through which the screw 4 rotates during this period is called the passing angle in the art. The structure of the valve core assembly 5 of this embodiment can improve the ability of the electronic expansion valve to resist reverse pressure in the closed state and ensure the reliable closing of the electronic expansion valve.
[0025] When the electronic expansion valve switches from the closed state to the open state, the electromagnetic coil of the electronic expansion valve is energized to generate a magnetic field. Under the action of the magnetic field, the magnetic rotor 3 rotates along the second direction opposite to the first direction, and drives the screw 4 and the valve stem 51 to rotate synchronously. While rotating, the screw 4 moves axially upward, and drives the magnetic rotor 3 and the valve stem 51 to move axially upward together. When the pressure ring 513 of the valve stem 51 contacts the top cover portion 522 of the valve core 52, it will drive the valve core 52 to move upward together, so that the valve core 52 leaves the valve port 10. When the electronic expansion valve is fully open, the external thread 413 of the screw rod body 41 of the screw 4 disengages from the internal thread 23 of the nut 2, and the screw 4 and the valve stem 51 can no longer continue to move axially upward. The return spring 6 abuts against the inner wall of the housing 7 and is in a compressed state, which can ensure that the external thread 413 of the screw rod body 41 of the screw 4 can re-engage with the internal thread 23 of the nut 2 when closing the valve, realizing the downward rotational movement of the screw.
[0026] In the embodiment of the present utility model, the screw and the valve core assembly adopt a separated design. During the assembly process, the corresponding passing angle can be set only by rotating the magnetic rotor or the screw with the valve core 52 not rotating, and then the screw 4 and the valve core assembly 5 are fixedly connected. This can make the setting of the passing angle convenient for operation, simplify the setting process of the passing angle, and make the passing angle more stable. During this process, the valve core 52 does not rotate, so that the wear between the valve core and the valve port can be reduced and the leakage risk can be reduced. Figure 5 and Figure 6 respectively show two different ways to adjust the passing angle of the electronic expansion valve according to an embodiment of the present utility model. Figure 5 In [way 1], the passing angle is set by rotating the screw 4 when the screw 4 and the magnetic rotor 3 are not yet connected together. Figure 6 In [way 2], the passing angle is set by rotating the magnetic rotor 3 after the screw 4 and the magnetic rotor 3 are fixedly connected together. In these two ways, the valve core 52 is fixed and does not rotate or move up and down.
[0027] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model also intends to include these modifications and variations.
Claims
1. An electronic expansion valve, comprising a valve seat, a nut, a magnetic rotor, a screw rod and a valve core assembly; the valve seat is provided with a valve port, the nut is fixed on the valve seat, and the magnetic rotor is rotatably arranged outside the nut; characterized in that, The screw comprises a screw shaft and a stopper; the lower part of the screw shaft extends into the nut, the outer wall of the lower part of the screw shaft is provided with an external thread, and the external thread is spirally connected with the internal thread of the nut; the stopper is fixed to the upper part of the screw shaft and connected with the magnetic rotor so that the screw rotates synchronously with the magnetic rotor; the stopper is provided with a stopper extending toward the nut, and the nut is provided with a stopper for interfering with the stopper to prevent the screw from rotating; The valve core assembly comprises a valve stem, a valve core and an elastic element, wherein the valve core has an inner cavity, the elastic element is arranged in the inner cavity and abuts against the valve core; the upper portion of the valve stem is connected to the screw rod body, the lower portion of the valve stem is inserted into the inner cavity of the valve core in a manner that it can rotate relatively and move axially but cannot be separated, and abuts against the elastic element; When the valve core does not abut the valve port, the valve core moves synchronously with the valve stem; when the valve core abuts the valve port and cannot move further, the valve stem can overcome the elastic force of the elastic element and move toward the valve port until the anti-rotation portion abuts the stop portion.
2. The electronic expansion valve according to claim 1, wherein The limiting member is integrally formed with the screw rod body.
3. The electronic expansion valve according to claim 1 or 2, characterized in that, The magnetic rotor comprises a magnetic rotor body and a connecting piece. The magnetic rotor body has a central hole penetrating in the axial direction. The connecting piece is connected to the inner wall of the magnetic rotor body and is connected to the limiting piece.
4. The electronic expansion valve according to claim 3, characterized in that, The connecting member is integrally formed with the magnetic rotor body.
5. The electronic expansion valve according to claim 1, characterized in that, The valve core comprises a valve core body and a top cover, wherein the valve core body has a cavity opening upward, the top cover covers the cavity and is connected to the valve core body, and the top cover and the valve core body jointly define the inner cavity; The lower part of the valve stem passes through the top cover part and extends into the inner cavity. The bottom of the valve stem is provided with a pressure ring extending in the radial direction, and the pressure ring abuts against the elastic element.
6. The electronic expansion valve according to claim 5, wherein, The elastic element is a spring, and the spring abuts against the bottom surface of the inner cavity of the valve core.
7. The electronic expansion valve according to claim 5, characterized in that The bottom of the valve core body is in an inverted cone shape.
8. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve comprises a cover shell, the bottom end of which is connected to the valve seat and covers the nut, the magnetic rotor, the screw rod and the valve core assembly.
9. The electronic expansion valve according to claim 8, wherein, The electronic expansion valve comprises a return spring, which is sleeved outside the screw rod, and the bottom end of the return spring abuts against the limiter.
10. The electronic expansion valve according to claim 1, characterized in that, The stopper is arranged at the top end of the nut.