Rotor assembly and electronic expansion valve having same

Abstract

The present application provides a rotor assembly and an electronic expansion valve having same. The rotor assembly comprises: a connecting plate having a first end face and a second end face arranged opposite each other, wherein the first end face is provided with a mounting groove, one side of the mounting groove has an opening, and the connecting plate is provided with a limiting hole to extend through the first end face and the second end face; and a guiding member having a guiding plate and a guiding rod connected to each other, wherein the guiding plate is fixed in the mounting groove, the guiding rod passes through the limiting hole from the first end surface to the second end surface, a limiting structure is provided between the guiding rod and the limiting hole, the limiting structure is configured to limit a circumferential displacement of the guiding rod relative to the limiting hole, a connection location between the guiding plate and the guiding rod is within the opening, and a circumferential dimension of the connection location between the guiding plate and the guiding rod is smaller than a dimension of the opening. The technical solution of the present application can solve the problem in the prior art of the guiding member being prone to interfere with the connecting plate during assembly, which affects assembly quality.

Description

Rotor assembly and electronic expansion valve with same

[0001] The present application claims priority to the patent application with the application number 202422397977.3, filed on September 29, 2024, to the State Intellectual Property Office of China, and with the title “Rotor assembly and electronic expansion valve with same”. TECHNICAL FIELD

[0002] The present application relates to the technical field of electronic expansion valves, in particular to a rotor assembly and an electronic expansion valve with same. BACKGROUND

[0003] Currently, in the electronic expansion valve, a magnetic rotor is usually used to drive the valve needle assembly to move relatively close to or away from the valve port to accurately adjust the flow at the valve port. The magnetic rotor is fixedly connected with the valve needle assembly, and the magnetic rotor drives the valve needle assembly to rotate under the driving of the electromagnetic coil. The outer side of the valve needle assembly is sleeved with a nut seat, and the nut seat is threadedly connected with the valve needle assembly to switch the rotation of the valve needle assembly to the linear motion relative to the valve port.

[0004] During the movement of the valve needle assembly, in order to ensure the stability of the cooperation, the movement range of the valve needle assembly needs to be controlled. Currently, a stop ring is usually sleeved on the outer side of the nut seat, and the stop ring is provided with an upper limit position and a lower limit position in the axial direction relative to the nut seat. A connecting plate is provided on the magnetic rotor, and a driving member is fixedly connected with the magnetic rotor through the connecting plate. During the rotation of the magnetic rotor, the driving member cooperates with the stop ring to drive 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 rotation of the driving member, thereby achieving the rotation stop of the magnetic rotor to control the movement range of the valve needle assembly. In order to ensure the stability of the cooperation between the connecting plate and the driving member and prevent the connecting plate from rotating relative to the driving member, a limiting structure and a fixing structure are usually arranged between the connecting plate and the driving member. However, due to the machining tolerance of the limiting structure and the fixing structure, the driving member is prone to interfere with the limiting structure or the fixing structure during assembly, which affects the assembly effect. SUMMARY

[0005] The present application provides a rotor assembly and an electronic expansion valve with same to solve the problem that the driving member is prone to interfere with the connecting plate during assembly in the prior art, which affects the assembly effect.

[0006] According to an aspect of the present application, a rotor assembly is provided, the rotor assembly comprising: a connecting plate having oppositely arranged first and second end faces, the first end face being provided with a mounting groove, the mounting groove having an opening on one side thereof, the connecting plate being provided with a limiting hole extending through the first and second end faces; a guide member having a guide piece and a guide rod connected to each other, the guide piece being fixed in the mounting groove, the guide rod extending through the limiting hole from the first end face to the second end face, the guide rod and the limiting hole being provided with a limiting structure for limiting the displacement of the guide rod relative to the limiting hole in the circumferential direction, the connection between the guide piece and the guide rod being located in the opening, and the size of the connection between the guide piece and the guide rod in the circumferential direction being smaller than the size of the opening.

[0007] Further, the side wall of the limiting hole oppositely arranged in the circumferential direction is tightly fitted with the guide rod, and the side wall of the limiting hole oppositely arranged in the circumferential direction forms the limiting structure.

[0008] Further, 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.

[0009] Further, the mounting groove is circular, and the shape of the guide piece is adapted to the shape of the mounting groove.

[0010] Further, the bottom of the mounting groove is arranged to protrude from the first end face.

[0011] Further, the first end face is provided with a mounting boss extending away from the first end face, and the mounting boss forms the mounting groove.

[0012] Further, the connecting plate is provided with a first connecting hole, and the guide piece is provided with a second connecting hole, the first and second connecting holes being coaxially arranged and in communication with each other.

[0013] Further, the guide rod has a first segment, a second segment and a third segment connected in sequence, the first segment being used to connect with the guide piece, the first and third segments extending in the axial direction of the rotor assembly, and the distance between the second segment and the axial line of the rotor assembly gradually increases in the direction away from the connecting plate.

[0014] Further, the rotor assembly further comprises a magnetic rotor, and the inner wall of the magnetic rotor is annularly provided with a limiting groove, and the connecting plate is arranged in the limiting groove to limit the movement of the connecting plate relative to the magnetic rotor in the axial direction.

[0015] According to an aspect of the present application, an electronic expansion valve is provided, the electronic expansion valve comprising the above-mentioned rotor assembly.

[0016] According to the technical scheme, the rotor assembly comprises a connecting plate and a driving piece, the driving piece is fixedly connected with the connecting plate through a driving sheet, a driving rod extends to the direction of the second end face through a limiting hole, so as to cooperate with other components of the electronic expansion valve, and the driving rod can limit the circumferential rotation of the driving piece relative to the connecting plate through the limiting structure during the rotation of the driving rod with the connecting plate, so as to ensure the driving effect of the driving rod. When the connecting plate and the driving piece are assembled, the driving rod is first inserted through the limiting hole, and then the connecting position of the driving sheet and the driving rod is aligned with the opening, so that the driving sheet is fixed in the mounting groove. When the driving sheet enters the mounting groove, the size of the connecting position of the driving sheet and the driving rod in the circumferential direction is smaller than the size of the opening, so that the positioning accuracy requirement of the driving sheet is reduced, the opening is prevented from interfering with the installation of the driving piece, and the assembly effect of the driving piece is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. The illustrative embodiments of the present application and their description serve to explain the present application. In the drawings:

[0018] Fig. 1 shows a structural schematic view of a rotor provided by the present application;

[0019] Fig. 2 shows a top view of a rotor provided by the present application;

[0020] Fig. 3 shows a structural schematic view of an electronic expansion valve provided by the present application.

[0021] In the above drawings, the following reference signs are used: 10, connecting plate; 101, mounting groove; 102, opening; 103, limiting hole; 11, mounting boss; 20, driving piece; 21, driving sheet; 22, driving rod; 221, first section; 222, second section; 223, third section; 30, magnetic rotor; 01, valve body; 02, valve needle; 03, screw rod; 04, nut seat; 05, stop ring; 06, sleeve. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] As shown in FIG. 1 and FIG. 2, the rotor assembly provided by the embodiment of the present application comprises a connecting plate 10 and a driving member 20. The connecting plate 10 has a first end face and a second end face oppositely arranged along the thickness direction, the first end face is provided with a mounting groove 101, one side face of the mounting groove 101 is provided with an opening 102, and the connecting plate 10 is provided with a limiting hole 103 penetrating through the first end face and the second end face. The driving member 20 has a driving sheet 21 and a driving rod 22 connected with each other, the driving sheet 21 is fixed in the mounting groove 101, the driving rod 22 extends from the first end face to the second end face and penetrates through the limiting hole 103 from the first end face to the second end face, and the driving rod 22 and the limiting hole 103 have a limiting structure for limiting the circumferential displacement of the driving rod 22 relative to the limiting hole 103. The connection position of the driving sheet 21 and the driving rod 22 is located in the opening 102, and the circumferential size of the connection position of the driving sheet 21 and the driving rod 22 is smaller than the size of the opening 102, that is, there is a gap between the connection position of the driving sheet 21 and the driving rod 22 and the opening 102 in the circumferential direction.

[0024] By using the technical scheme of the present application, the rotor assembly comprises the connecting plate 10 and the driving member 20, the driving member 20 is fixedly connected with the connecting plate 10 through the driving sheet 21, the driving rod 22 extends to the second end face through the limiting hole 103 to cooperate with other components of the electronic expansion valve, and in the process of rotating the driving rod 22 with the connecting plate 10, the driving rod 22 can limit the circumferential rotation of the driving member 20 relative to the connecting plate 10 through the limiting structure to ensure the driving effect of the driving rod 22. When assembling the connecting plate 10 and the driving member 20, the driving rod 22 is first penetrated through the limiting hole 103, and then the connection position of the driving sheet 21 and the driving rod 22 is aligned with the opening 102 to fix the driving sheet 21 in the mounting groove 101. When the driving sheet 21 enters the mounting groove 101, because the circumferential size of the connection position of the driving sheet 21 and the driving rod 22 is smaller than the size of the opening 102, the positioning accuracy requirement of the driving sheet 21 can be reduced, the installation of the opening 102 to the driving member 20 can be prevented, and the assembly effect of the driving member 20 can be ensured.

[0025] Specifically, the first end face is located on the side of the second end face away from the nut seat 04.

[0026] Specifically in the present application, the driving sheet 21 refers to the structure fixed in the mounting groove 101, the driving rod 22 refers to the rod-shaped structure extending in the vertical direction, and the connection position of the driving sheet 21 and the driving rod 22 is the connection structure connecting the driving sheet 21 and the driving rod 22. The connection structure can be a structure formed by bending the driving rod 22, or a structure extending from the driving sheet 21 to the driving rod 22.

[0027] Specifically, the side walls of the limiting holes 103 arranged opposite in the circumferential direction are tightly fitted with the guide rod 22, and the side walls of the limiting holes 103 arranged opposite in the circumferential direction form a limiting structure. Through the above arrangement, the side walls of the limiting holes 103 arranged opposite in the circumferential direction can be interference-fitted with the guide rod 22, and the side walls of the limiting holes 103 arranged opposite in the circumferential direction can form a support point of the guide rod 22 and the connecting plate 10 in the circumferential direction, so as to limit the rotation of the guide rod 22 relative to the connecting plate 10 and ensure the guiding effect of the guide rod 22.

[0028] Specifically, the mounting groove 101 is tightly fitted with the guide piece 21, so as to limit the displacement of the guide piece 21 relative to the mounting groove 101 in the circumferential direction. The tight fitting of the mounting groove 101 and the guide piece 21 is to install the guide piece 21 into the mounting groove 101 in an interference manner, and the side walls of the mounting groove 101 can form a support point of the guide piece 21 and the connecting plate 10 in the circumferential direction, so as to fix the guide 20 relative to the connecting plate 10, prevent the guide piece 21 from being skewed and raised, and ensure the connection strength of the guide piece 21.

[0029] In the conventional technical solution, in order to limit the rotation of the guide 20 relative to the connecting plate 10, a rotation-stopping structure such as a cutting surface structure is usually arranged between the guide piece 21 and the mounting groove 101, the guide rod 22 extends through a process hole on the connecting plate 10, and no limiting structure is arranged between the process hole and the guide rod 22. In this way, the connection between the guide rod 22 and the guide piece 21 forms a cantilever structure, the connection between the guide rod 22 and the guide piece 21 is relatively weak, and after being subjected to stress, the guide piece 21 is easily skewed and raised, which affects the welding strength of the welding position of the guide piece 21 and the screw rod 03, and even causes the limiting failure of the whole rotor assembly. In the present application, a support point is arranged for the guide rod 22 at the limiting hole 103, and a support point is arranged for the guide piece 21 at the mounting groove 101, so as to provide two support points for the whole connection of the connecting plate 10 and the guide 20. When the guide 20 is subjected to a transverse deflection force, the two support points can cooperate with each other to prevent the guide piece 21 from being skewed and raised, prevent the welding strength of the welding position of the guide piece and the screw rod 03 from being affected, and increase the guiding strength.

[0030] In some embodiments of the present application, the mounting groove 101 is polygonal, and the shape of the guide piece 21 is matched with the shape of the mounting groove 101. By arranging the mounting groove 101 as a polygon, the guide piece 21 can also be stopped from rotating by the mounting groove 101, so as to improve the connection effect of the connecting plate 10 and the guide 20.

[0031] Specifically, the mounting groove 101 can be triangular, rectangular or other polygonal.

[0032] In the present application, the mounting groove 101 is circular, and the shape of the driving piece 21 is matched with the shape of the mounting groove 101. Compared with the scheme that the mounting groove 101 is polygonal, when assembling the driving piece 20, the driving rod 22 is first inserted through the limiting hole 103. Because the limiting hole 103 is tightly matched with the driving rod 22, even if there is a gap between the connection part of the driving piece 21 and the driving rod 22 and the opening 102, the multiple edges of the driving piece 21 still need to be aligned with the multiple edges of the mounting groove 101, so the assembly of the driving piece 21 may be affected. In the present embodiment, by setting the mounting groove 101 as a circular shape, the positioning accuracy requirement of the mounting groove 101 and the driving piece 21 can be reduced, and the assembly difficulty of the driving piece 21 is reduced.

[0033] Moreover, by setting the mounting groove 101 as a circular shape, it is more convenient to test the coaxiality of the driving piece 20 and the connecting plate 10 during the production and assembly process of the overall rotor assembly, and the quality of the parts can be more easily controlled.

[0034] Specifically, in the present application, the groove bottom of the mounting groove 101 is arranged to protrude from the first end face, that is, the fulcrum formed between the driving rod 22 and the connecting plate 10 and the fulcrum formed between the driving piece 21 and the mounting groove 101 have a gap in the height direction, so as to further improve the fixing effect between the driving piece 20 and the connecting plate 10 and prolong the length of the force arm between the two fulcrums.

[0035] Specifically, the first end face is provided with a mounting boss 11 extending away from the first end face, the mounting boss 11 forms the mounting groove 101, and the side wall of the mounting boss 11 is provided with a notch structure forming the opening 102. Specifically, the groove bottom of the mounting groove 101 is provided with a structure groove near the side wall of the mounting boss 11, so as to reduce the burr that may be generated when the mounting groove 101 is processed, or the inaccuracy of the mounting groove 101 caused by the machining precision problem, so as to ensure the assembly effect of the mounting groove 101 of the driving piece 21.

[0036] Specifically, the connecting plate 10 is provided with a first connecting hole, and the driving piece 21 is provided with a second connecting hole, the first connecting hole and the second connecting hole are in communication with each other and are coaxially arranged. In the present application, the first connecting hole and the second connecting hole are used for inserting the screw rod 03, by setting the mounting groove 101 as a circular shape, the coaxiality of the first connecting hole and the second connecting hole can be ensured, and the reliability of the rotor assembly can be ensured. Specifically, the hole diameters of the first connecting hole and the second connecting hole are the same, which facilitates the processing of the connecting plate 10 and the driving piece 20, and the screw rod 03 can be conveniently inserted.

[0037] In the application, the guide rod 22 has a first section 221, a second section 222 and a third section 223 connected in sequence, the first section 221 is used to be connected with the guide sheet 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 rotor assembly axis gradually increases in the direction away from the connecting plate 10. The end of the first section 221 away from the second section 222 forms a connecting end connected with the guide sheet 21, and the end of the third section 223 away from the second section 222 forms a free end. The distance from the first section 221 to the rotor assembly axis is less than the distance from the third section 223 to the rotor assembly axis. Through the above arrangement, the distance between the connecting end and the rotor assembly axis in the radial direction is reduced, so as to reduce the centrifugal force of the guide sheet 21 during rotation, to ensure the stability of the screw rod 03 rotation as much as possible, and to facilitate the accurate flow regulation of the electronic expansion valve.

[0038] Specifically, the rotor assembly further comprises a magnetic rotor 30, which is used to cooperate with the electromagnetic coil to drive the connecting plate 10 and the guide member 20 to rotate. The inner wall of the magnetic rotor 30 is annularly provided with a limiting groove, 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. Through the arrangement of the limiting groove, the connection effect of the connecting plate 10 and the magnetic rotor 30 can be improved.

[0039] The application further provides an electronic expansion valve, as shown in FIG. 3, which comprises the above-mentioned rotor assembly.

[0040] The electronic expansion valve further comprises a valve body 01, a valve needle 02, a screw rod 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 with the screw rod 03, the rotor assembly is arranged in the sleeve 06, and the rotor assembly is connected with the screw rod 03 through the first connecting hole and the second connecting hole to drive the screw rod 03 to rotate. The nut seat 04 is sleeved on the outer side of the screw rod 03 and is in threaded cooperation with the screw rod 03, so as to convert the circumferential rotation of the screw rod 03 into linear motion to drive the valve needle 02 to move relative to the valve port and adjust the flow of fluid at the valve port.

[0041] Specifically, the valve needle 02 and the screw rod 03 can be a split structure connected by a connecting piece or a buffer piece, or can be an integrally formed structure.

[0042] The nut seat 04 has two limiting blocks arranged oppositely in the axial direction, and the outer surface between the two limiting blocks is also provided with a threaded structure. The stop ring 05 is sleeved on the outer side of the nut seat 04 and located between the two limiting blocks. The stop ring 05 has a matching part extending in the radial direction of the stop ring 05 and limiting matched 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 matching part. When the stop ring 05 rotates relative to the nut seat 04, the stop ring 05 can move between the two limiting blocks through the threaded structure on the outer surface of the nut seat 04. When the stop ring 05 moves to the limiting block, the stop ring 05 cannot continue to move, at this time the guide rod 22 is stopped and cannot continue to rotate, realizing the braking of the rotor assembly, so as to realize the upper and lower limiting of the valve needle 02 and the screw rod 03, and limit the movement range of the valve needle 02.

[0043] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor assembly characterized by, The rotor assembly comprises: a connecting plate (10) having oppositely arranged first and second end faces, the first end face being provided with a mounting groove (101) having an opening (102) on one side, the connecting plate (10) being provided with a limiting hole (103) penetrating the first and second end faces; a guide member (20) having a guide piece (21) and a guide rod (22) connected to each other, the guide piece (21) being fixed in the mounting groove (101), the guide rod (22) penetrating the first end face to the second end face through the limiting hole (103), the limiting hole (103) and the guide rod (22) having a limiting structure for limiting the circumferential displacement of the guide rod (22) relative to the limiting hole (103), the connection between the guide piece (21) and the guide rod (22) being located in the opening (102), and the circumferential dimension of the connection between the guide piece (21) and the guide rod (22) being smaller than the dimension of the opening (102).

2. The rotor assembly of claim 1, wherein The circumferentially oppositely arranged side walls of the limiting hole (103) are tightly fitted with the guide rod (22), and the circumferentially oppositely arranged side walls of the limiting hole (103) form the limiting structure.

3. The rotor assembly of claim 2, wherein, 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).

4. The rotor assembly of claim 3, wherein The mounting groove (101) is circular, and the shape of the guide piece (21) is adapted to the shape of the mounting groove (101).

5. The rotor assembly of claim 1, wherein The bottom of the mounting groove (101) is arranged to protrude from the first end face.

6. The rotor assembly of claim 1, wherein The first end face is provided with a mounting boss (11) extending away from the first end face, and the mounting boss (11) forms the mounting groove (101).

7. The rotor assembly of claim 1, wherein 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 being coaxially arranged and in communication with each other.

8. The rotor assembly of claim 1, wherein The guide rod (22) has a first segment (221), a second segment (222) and a third segment (223) connected in sequence, the first segment (221) being used to connect with the guide piece (21), the first segment (221) and the third segment (223) extending along the axial direction of the rotor assembly, and the distance between the second segment (222) and the axis of the rotor assembly gradually increases in the direction away from the connecting plate (10).

9. The rotor assembly of claim 1, wherein, The rotor assembly further comprises a magnetic rotor (30), and an inner wall of the magnetic rotor (30) is annularly provided with a limiting groove, 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 by The electronic expansion valve comprises the rotor assembly according to any one of claims 1 to 9.

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