Rotor assembly and electronic expansion valve with same

Abstract

The utility model provides a rotor assembly and an electronic expansion valve with the same, the rotor assembly comprises a connecting plate, the connecting plate is provided with a first end face and a second end face which are oppositely arranged, the first end face is provided with a mounting groove, one side of the mounting groove is provided with an opening, and the connecting plate is provided with a limiting hole to penetrate through the first end face and the second end face; the movement guiding piece is provided with a movement guiding piece and a movement guiding rod which are connected with each other, the movement guiding piece is fixed in the mounting groove, the movement guiding rod penetrates from the first end face to the second end face through the limiting hole, and a limiting structure is arranged between the movement guiding rod and the limiting hole and used for limiting the movement guiding rod to move in the circumferential direction relative to the limiting hole; according to the technical scheme of the utility model, the connection part of the movement guiding piece and the movement guiding rod is located in the opening, and the size of the connection part of the movement guiding piece and the movement guiding rod in the circumferential direction is smaller than the size of the opening, so that the problem that the assembly effect is affected due to the fact that the movement guiding piece in the prior art is easy to interfere with the connecting plate during assembly can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to a rotor assembly and an electronic expansion valve having the same. Background Art

[0002] Currently, electronic expansion valves typically use a magnetic rotor to drive the valve needle assembly toward or away from the valve orifice to precisely adjust the flow rate at the valve orifice. The magnetic rotor is fixedly connected to the valve needle assembly. Driven by a solenoid coil, the magnetic rotor drives the valve needle assembly to rotate. A nut seat is sleeved around the outer surface of the valve needle assembly, which threads into the valve needle assembly to convert the needle assembly's rotational motion into linear motion relative to the valve orifice.

[0003] During the movement of the valve needle assembly, in order to ensure the stability of the fit, it is necessary to control the range of motion of the valve needle assembly. Currently, a stop ring is usually sleeved on the outside of the nut seat. The stop ring is axially set with an upper limit position and a lower limit position relative to the nut seat. A connecting plate and a guide are provided on the magnetic rotor. The guide is fixedly connected to the magnetic rotor through the connecting plate. During the rotation of the magnetic rotor, the guide and the stop ring cooperate to push the stop ring to rotate relative to the nut seat and move between the upper limit position and the lower limit position. When the stop ring reaches the upper limit position or the lower limit position, the stop ring can prevent the guide from rotating, thereby achieving the purpose of stopping the magnetic rotor and controlling the range of motion of the valve needle assembly. In order to ensure the stability of the fit between the connecting plate and the guide and prevent the connecting plate from rotating relative to the guide, a limiting structure and a fixing structure are usually set between the connecting plate and the guide. When assembling the connecting plate and the guide, due to the processing tolerance of the limiting structure and the fixing structure, it is easy for the guide to interfere with the limiting structure or the fixing structure during assembly, affecting the assembly effect. Utility Model Content

[0004] The utility model provides a rotor assembly and an electronic expansion valve having the same, so as to solve the problem in the prior art that a guide member is likely to interfere with a connecting plate during assembly, thereby affecting the assembly effect.

[0005] According to one aspect of the present invention, a rotor assembly is provided, which includes: a connecting plate, having a first end face and a second end face arranged opposite to each other, a mounting groove being provided on the first end face, an opening being provided on one side of the mounting groove, and a limiting hole being provided on the connecting plate to pass through the first end face and the second end face; a guide member, having a guide plate and a guide rod connected to each other, the guide plate being fixed in the mounting groove, the guide rod passing from the first end face to the second end face through the limiting hole, a limiting structure being provided between the guide rod and the limiting hole, the limiting structure being used to limit the circumferential displacement of the guide rod relative to the limiting hole, the connection between the guide plate and the guide rod being located in the opening, and the circumferential size of the connection between the guide plate and the guide rod being smaller than the size of the opening.

[0006] Furthermore, the side walls of the limiting hole that are opposite to each other along the circumferential direction are tightly matched with the guide rod, and the side walls of the limiting hole that are opposite to each other along the circumferential direction form a limiting structure.

[0007] Furthermore, the mounting groove is tightly fitted with the guide piece to limit the displacement of the guide piece relative to the mounting groove in the circumferential direction.

[0008] Furthermore, the mounting groove is circular, and the shape of the guide piece matches the shape of the mounting groove.

[0009] Furthermore, the bottom of the mounting groove is arranged to protrude from the first end surface.

[0010] Furthermore, a mounting boss is provided on the first end surface, and the mounting boss extends in a direction away from the first end surface, and the mounting boss forms a mounting groove.

[0011] Furthermore, a first connecting hole is provided on the connecting plate, and a second connecting hole is provided on the guide plate. The first connecting hole and the second connecting hole are communicated with each other and are coaxially arranged.

[0012] Furthermore, the guide rod has a first section, a second section and a third section connected in sequence, the first section is used to connect with the guide plate, the first section and the third section extend along the axial direction of the rotor assembly, and the distance between the second section and the axis of the rotor assembly gradually increases in the direction away from the connecting plate.

[0013] Furthermore, the rotor assembly also includes a magnetic rotor, an inner wall of which is provided with a limiting groove in an annular manner, and the connecting plate is provided in the limiting groove to limit the axial movement of the connecting plate relative to the magnetic rotor.

[0014] According to one aspect of the present invention, an electronic expansion valve is provided. The electronic expansion valve includes the above-mentioned rotor assembly.

[0015] According to the technical solution of the present invention, the rotor assembly includes a connecting plate and a guide member, wherein the guide member is fixedly connected to the connecting plate via a guide plate, and the guide rod extends through a limiting hole toward the second end face to cooperate with other components of the electronic expansion valve. When the guide rod rotates with the connecting plate, the guide rod can limit the circumferential rotation of the guide member relative to the connecting plate through a limiting structure to ensure the driving effect of the guide rod. When assembling the connecting plate and the guide member, the guide rod is first passed through the limiting hole, and then the connection between the guide plate and the guide rod is aligned with the opening to fix the guide member in the installation groove. When the guide member enters the installation groove, the circumferential size of the connection between the guide member and the guide rod is smaller than the size of the opening, so that the positioning accuracy requirement of the guide member can be reduced, thereby preventing the opening from interfering with the installation of the guide member and ensuring the assembly effect of the guide member. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Shows a schematic structural diagram of the rotor provided by the utility model;

[0018] Figure 2 Shows a top view of the rotor provided by the utility model;

[0019] Figure 3 The figure shows a structural diagram of the electronic expansion valve provided by the present utility model.

[0020] The above drawings include the following reference numerals:

[0021] 10. Connecting plate;

[0022] 101, mounting slot; 102, opening; 103, limiting hole;

[0023] 11. Install the boss;

[0024] 20. Guide piece;

[0025] 21. Guide plate;

[0026] 22, guide rod; 221, first section; 222, second section; 223, third section;

[0027] 30. Magnetic rotor;

[0028] 01. Valve body; 02. Valve needle; 03. Screw; 04. Nut seat; 05. Stop ring; 06. Sleeve. DETAILED DESCRIPTION

[0029] 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 embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a rotor assembly, which includes a connecting plate 10 and a guide 20. The connecting plate 10 has a first end surface and a second end surface arranged opposite to each other along the thickness direction. The first end surface is provided with a mounting groove 101, and an opening 102 is provided on one side of the mounting groove 101. The connecting plate 10 is provided with a limiting hole 103 that penetrates the first end surface and the second end surface. The guide member 20 has a guide plate 21 and a guide rod 22 that are connected to each other. The guide plate 21 is fixed in the mounting groove 101. The guide rod 22 extends from the first end surface to the second end surface, and is passed through the limiting hole 103 from the first end surface to the second end surface. There is a limiting structure between the guide rod 22 and the limiting hole 103. The limiting structure is used to limit the circumferential displacement of the guide rod 22 relative to the limiting hole 103. The connection between the guide plate 21 and the guide rod 22 is located in the opening 102, and the circumferential size of the connection between the guide plate 21 and the guide rod 22 is smaller than the size of the opening 102, that is, there is a circumferential gap between the connection between the guide plate 21 and the guide rod 22 and the opening 102.

[0031] Applying the technical solution of the present invention, the rotor assembly includes a connecting plate 10 and a guide member 20. The guide member 20 is fixedly connected to the connecting plate 10 through a guide piece 21. The guide rod 22 extends toward the second end face through the limiting hole 103 to cooperate with other components of the electronic expansion valve. In the process of the guide rod 22 rotating with the connecting plate 10, the guide rod 22 can limit the circumferential rotation of the guide member 20 relative to the connecting plate 10 through the limiting structure to ensure the driving effect of the guide rod 22. When assembling the connecting plate 10 and the guide member 20, first pass the guide rod 22 through the limiting hole 103, and then align the connection between the guide piece 21 and the guide rod 22 with the opening 102 to fix the guide piece 21 in the installation groove 101. When the guide piece 21 enters the installation groove 101, since the circumferential size of the connection between the guide piece 21 and the guide rod 22 is smaller than the size of the opening 102, the positioning accuracy requirement of the guide piece 21 can be reduced, and the opening 102 is prevented from interfering with the installation of the guide member 20, thereby ensuring the assembly effect of the guide member 20.

[0032] Specifically, the first end surface is located on a side of the second end surface facing away from the nut seat 04 .

[0033] Specifically in this application, the guide plate 21 refers to a structure fixed in the mounting groove 101, the guide rod 22 refers to a rod-shaped structure extending in the vertical direction, and the connection between the guide plate 21 and the guide rod 22 is a connecting structure connecting the guide plate 21 and the guide rod 22. The connecting structure can be a structure formed by bending the guide rod 22, or it can be a structure in which the guide plate 21 extends in the direction of the guide rod 22.

[0034] Specifically, the circumferentially opposed side walls of the limiting hole 103 tightly fit the guide rod 22, forming a limiting structure. Through the above arrangement, the circumferentially opposed side walls of the limiting hole 103 can achieve an interference fit with the guide rod 22, and the circumferentially opposed side walls of the limiting hole 103 can form a circumferential support point between the guide rod 22 and the connecting plate 10, thereby limiting the rotation of the guide rod 22 relative to the connecting plate 10 and ensuring the guiding effect of the guide rod 22.

[0035] Specifically, the mounting groove 101 is tightly fitted with the guide piece 21 to limit the circumferential displacement of the guide piece 21 relative to the mounting groove 101. The tight fit between the mounting groove 101 and the guide piece 21 means that the guide piece 21 is installed into the mounting groove 101 by interference fit. The sidewall of the mounting groove 101 can form a support point between the guide piece 21 and the connecting plate 10 in the circumferential direction, thereby fixing the guide piece 20 relative to the connecting plate 10, preventing the guide piece 21 from tilting or warping, and ensuring the connection strength of the guide piece 21.

[0036] In conventional solutions, to limit the rotation of the guide member 20 relative to the connecting plate 10, a stop structure, such as a cutaway structure, is typically provided between the guide plate 21 and the mounting slot 101. The guide rod 22 extends through a process hole in the connecting plate 10, but no stop structure is provided between the process hole and the guide rod 22. This creates a cantilevered connection between the guide rod 22 and the guide plate 21, which is relatively weak. This connection can easily cause the guide plate 21 to tilt or warp under stress, affecting the weld strength between the guide plate 21 and the screw 03, and even causing the entire rotor assembly to fail. In the present application, by setting a support point for the guide rod 22 at the limiting hole 103 and a support point for the guide plate 21 at the mounting groove 101, two support points can be provided for the overall connection between the connecting plate 10 and the guide member 20. When the guide member 20 is subjected to a lateral deflection force, the two support points cooperate with each other to prevent the guide plate 21 from tilting and warping, and prevent affecting the welding strength of the guide plate and the screw 03, thereby increasing the guide strength.

[0037] In some embodiments of the present application, the mounting groove 101 is a polygon, and the shape of the guide plate 21 is adapted to the shape of the mounting groove 101. By setting the mounting groove 101 to a polygon, the guide plate 21 can also be stopped by the mounting groove 101, thereby improving the connection effect between the connecting plate 10 and the guide member 20.

[0038] Specifically, the mounting groove 101 may be in the shape of a triangle, a rectangle or other polygons.

[0039] In the present application, the mounting groove 101 is circular, and the shape of the guide piece 21 matches the shape of the mounting groove 101. Compared to the solution in which the mounting groove 101 is polygonal, when assembling the guide member 20, the guide rod 22 is first passed through the limiting hole 103. Because the limiting hole 103 and the guide rod 22 are tightly matched, even if there is a gap between the connection between the guide piece 21 and the guide rod 22 and the opening 102, it is still necessary to align multiple edges of the guide piece 21 with multiple edges of the mounting groove 101, which may also affect the assembly of the guide piece 21. In this embodiment, by setting the mounting groove 101 to be circular, the positioning accuracy requirements of the mounting groove 101 and the guide piece 21 can be reduced, thereby reducing the difficulty of assembling the guide piece 21.

[0040] Furthermore, by setting the mounting groove 101 to be circular, it is easier to test the coaxiality of the guide member 20 and the connecting plate 10 during the production and assembly process of the entire rotor assembly, and it is easier to control the quality of the parts.

[0041] Specifically in the present application, the bottom of the mounting groove 101 protrudes from the first end surface, that is, the fulcrum formed between the guide rod 22 and the connecting plate 10 and the fulcrum formed between the guide plate 21 and the mounting groove 101 are spaced apart in the height direction, thereby further improving the fixing effect between the guide member 20 and the connecting plate 10 and extending the length of the force arm between the two fulcrums.

[0042] Specifically, a mounting boss 11 is provided on the first end surface, extending away from the first end surface. The mounting boss 11 forms a mounting groove 101. A notch structure is provided on the sidewall of the mounting boss 11, forming an opening 102. Specifically, a structural groove is provided at the bottom of the mounting groove 101 near the sidewall of the mounting boss 11 to reduce burrs that may be generated during the machining of the mounting groove 101, or inaccuracies in the machining of the mounting groove 101 due to machining accuracy issues, thereby ensuring a proper assembly of the mounting groove 101 with the guide plate 21.

[0043] Specifically, the connecting plate 10 is provided with a first connecting hole, and the guide piece 21 is provided with a second connecting hole. The first and second connecting holes are interconnected and coaxially arranged. In this application, the first and second connecting holes are used to pass through the screw 03. By designing the mounting groove 101 as a circle, the coaxiality of the first and second connecting holes is ensured, thus ensuring the reliability of the rotor assembly. Specifically, the first and second connecting holes have the same diameter, which facilitates the processing of the connecting plate 10 and the guide piece 20 and facilitates the insertion of the screw 03.

[0044] In the present application, the guide rod 22 includes a first section 221, a second section 222, and a third section 223, which are connected in sequence. The first section 221 is used to connect to the guide plate 21. The first section 221 and the third section 223 extend axially along the rotor assembly. The spacing between the second section 222 and the axis of the rotor assembly gradually increases in a direction away from the connecting plate 10. The end of the first section 221 away from the second section 222 forms a connection end connected to the guide plate 21, and the end of the third section 223 away from the second section 222 forms a free end. The distance between the first section 221 and the axis of the rotor assembly is smaller than the distance between the third section 223 and the axis of the rotor assembly. This arrangement reduces the distance between the connection end and the axis of the rotor assembly in the radial direction, thereby reducing the centrifugal force on the guide plate 21 during rotation, ensuring smooth rotation of the screw 03, and facilitating precise flow regulation by the electronic expansion valve.

[0045] Specifically, the rotor assembly also includes a magnetic rotor 30, which is used to cooperate with the electromagnetic coil to drive the connecting plate 10 and the guide 20 to rotate. The inner wall of the magnetic rotor 30 is provided with an annular limit groove, and the connecting plate 10 is disposed in the limit groove to limit the axial movement of the connecting plate 10 relative to the magnetic rotor 30. The provision of the limit groove can improve the connection between the connecting plate 10 and the magnetic rotor 30.

[0046] The present application also provides an electronic expansion valve. Figure 3 As shown, the electronic expansion valve includes the above-mentioned rotor assembly.

[0047] The electronic expansion valve also includes a valve body 01, a valve needle 02, a screw 03, a nut seat 04, a stop ring 05, and a sleeve 06. The valve body 01 has a valve port, the valve needle 02 is connected to the screw 03, and the rotor assembly is disposed in the sleeve 06. The rotor assembly is connected to the screw 03 through a first connecting hole and a second connecting hole to drive the screw 03 to rotate. The nut seat 04 is sleeved on the outside of the screw 03 and engages with the screw 03 thread. This can convert the circumferential rotation of the screw 03 into linear motion, thereby driving the valve needle 02 to move relative to the valve port and adjust the flow rate of the fluid at the valve port.

[0048] Specifically, the valve needle 02 and the screw 03 can be a separate structure, connected by a connector or a buffer; or they can be an integrally formed structure.

[0049] The nut seat 04 has two limit blocks arranged opposite to each other along the axial direction. The outer surface between the two limit blocks is also provided with a threaded structure. The stop ring 05 is sleeved on the outer side of the nut seat 04 and is located between the two limit blocks. The stop ring 05 has a mating portion that extends in the radial direction of the stop ring 05 and is limitedly engaged with the guide rod 22. When the rotor assembly drives the guide rod 22 to rotate, the guide rod 22 can drive the stop ring 05 to rotate relative to the nut seat 04 through the mating portion. When the stop ring 05 rotates relative to the nut seat 04, the stop ring 05 can move between the two limit blocks through the threaded structure on the outer surface of the nut seat 04. When the stop ring 05 moves to the limit block, the stop ring 05 cannot move further. At this time, the guide rod 22 is stopped and cannot continue to rotate, thereby braking the rotor assembly to achieve the upper and lower limits of the valve needle 02 and the screw rod 03, limiting the movement range of the valve needle 02.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0052] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: A connecting plate (10) having a first end face and a second end face arranged opposite to each other, a mounting groove (101) being provided on the first end face, an opening (102) being provided on one side of the mounting groove (101), and a limiting hole (103) being provided on the connecting plate (10) to penetrate the first end face and the second end face; The guide member (20) comprises a guide plate (21) and a guide rod (22) connected to each other, wherein the guide plate (21) is fixed in the mounting groove (101), and the guide rod (22) is passed through the limiting hole (103) from the first end face to the second end face, and a limiting structure is provided between the guide rod (22) and the limiting hole (103), and the limiting structure is used to limit the displacement of the guide rod (22) relative to the limiting hole (103) in the circumferential direction, and the connection between the guide plate (21) and the guide rod (22) is located in the opening (102), and the circumferential size of the connection between the guide plate (21) and the guide rod (22) is smaller than the size of the opening (102).

2. The rotor assembly according to claim 1, wherein: The side walls of the limiting hole (103) arranged opposite to each other in the circumferential direction are tightly matched with the guide rod (22), and the side walls of the limiting hole (103) arranged opposite to each other in the circumferential direction form the limiting structure.

3. The rotor assembly according to claim 2, wherein: The installation groove (101) is tightly matched with the guide plate (21) to limit the displacement of the guide plate (21) relative to the installation groove (101) in the circumferential direction.

4. The rotor assembly according to claim 3, wherein: The installation groove (101) is circular, and the shape of the guide plate (21) is adapted to the shape of the installation groove (101).

5. The rotor assembly according to claim 1, wherein: The bottom of the installation groove (101) is arranged to protrude from the first end surface.

6. The rotor assembly according to claim 1, wherein: A mounting boss (11) is provided on the first end surface, the mounting boss (11) extends in a direction away from the first end surface, and the mounting boss (11) forms the mounting groove (101).

7. The rotor assembly according to claim 1, wherein: The connecting plate (10) is provided with a first connecting hole, and the guiding plate (21) is provided with a second connecting hole. The first connecting hole and the second connecting hole are communicated with each other and are coaxially arranged.

8. The rotor assembly according to claim 1, wherein: The guide rod (22) comprises a first section (221), a second section (222) and a third section (223) connected in sequence, wherein the first section (221) is used to be connected to the guide plate (21), the first section (221) and the third section (223) extend along the axial direction of the rotor assembly, and the distance between the second section (222) and the axis of the rotor assembly gradually increases in a direction away from the connecting plate (10).

9. The rotor assembly according to claim 1, wherein: The rotor assembly further comprises a magnetic rotor (30), an inner wall of which is provided with a limiting groove in an annular manner, and the connecting plate (10) is arranged in the limiting groove to limit the axial movement of the connecting plate (10) relative to the magnetic rotor (30).

10. An electronic expansion valve, characterized in that: The electronic expansion valve comprises the rotor assembly according to any one of claims 1 to 9.

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