Low-noise nut assembly and electronic expansion valve

Abstract

The invention discloses a low-noise nut assembly and an electronic expansion valve, the nut assembly comprises a nut body, the nut body is provided with a nut upper end face and a nut lower end face, and a nut stop block is arranged on the nut upper end face; a guide cavity is formed in the nut body, an inner threaded hole is formed in the guide cavity, and a pressure balance hole is formed in the bottom of the inner threaded hole. A nut connecting plate is embedded in the lower portion of the outer ring of the nut body, and the upper portion of the outer ring of the nut body is sleeved with a torsion spring. The torsion spring is provided with an upper end spring wire and a lower end spring wire, the upper end spring wire extends upwards to the upper end face of the nut and makes contact with the upper end face of the nut, and the lower end spring wire extends downwards to be relatively fixed to the nut body and / or the nut connecting plate. According to the low-noise nut assembly, unnecessary noise generated during operation of the electronic expansion valve can be reduced, the cost is low, and the service life is long.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle air-conditioning expansion valves, and in particular to a low-noise nut assembly and an electronic expansion valve. Background Art

[0002] In the vehicle air conditioning system, an electronic expansion valve is used to control the flow of refrigerant, which can achieve the purpose of regulating the air temperature. The vehicle electronic expansion valve includes a rotor assembly, a nut assembly, a valve needle assembly and a valve seat. The valve seat is provided with a valve port. The rotor assembly is used to drive the valve needle assembly to move to control the opening and closing area of ​​the valve port to achieve the control of the refrigerant flow. The rotor assembly is provided with a rotor, a rotor connecting plate and a screw. The rotor is usually made of neodymium iron boron, and the rotor connecting plate is embedded in the rotor. The screw and the rotor connecting plate are welded as one. The nut assembly is provided with a nut and a nut connecting plate. The nut is usually an injection molded part, and the nut connecting plate is embedded in the nut part. The screw and the nut in the rotor assembly are matched by threads. When the rotor assembly rotates, it moves up and down along the axial direction of the nut assembly. The travel distance of the rotor assembly affects the flow rate of the refrigerant. In order to more accurately locate the moving position of the rotor assembly, a stop mechanism is usually designed to achieve this purpose.

[0003] In the prior art, the Chinese invention patent with publication number CN112824689A discloses a nut assembly and an electronic expansion valve, wherein the nut assembly includes four components: a nut seat, a limit spring, a stop ring and a limit piece, which can solve the problem of poor stop positioning accuracy in the prior art. However, the technical solution drives the stop ring to rotate along the gap of the limit spring pitch through the limit piece, which not only has more components and higher costs, but also if the pitch of the stop ring and the limit spring is different, it is inevitable that the two parts will rub against each other to produce unnecessary noise. The Chinese invention patent with publication number CN112682524A discloses a guide shaft and an electronic expansion valve rotor assembly having the guide shaft; the invention is mainly designed as a guide shaft on the cylindrical surface of the nut assembly, and the stop ring rotates around its guide rail; although the solution has fewer components and has a cost advantage over the previous technical solution, the invention still cannot avoid the problem of friction between the guide rail and the stop ring, which will produce unnecessary noise. Therefore, it is urgent to develop a low-cost, long-life, low-noise nut assembly and an electronic expansion valve to solve the problems in the prior art. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned background technology and provide a low-noise nut assembly and an electronic expansion valve, which can reduce unnecessary noise generated by the electronic expansion valve during operation, and have low cost and long service life.

[0005] To achieve the above object, the present invention provides a low-noise nut assembly, comprising a nut body, the nut body having a nut upper end face and a nut lower end face, the nut upper end face being provided with a nut stopper; a guide cavity being provided inside the nut body, an internal threaded hole being provided in the guide cavity, and a pressure balance hole being provided at the bottom of the internal threaded hole;

[0006] A nut connecting plate is embedded in the lower part of the outer ring of the nut body, and a torsion spring is sleeved on the upper part of the outer ring of the nut body; the torsion spring has an upper spring wire and a lower spring wire, the upper spring wire extends upward to the upper end surface of the nut and contacts therewith, and the lower spring wire extends downward and is relatively fixed to the nut body and / or the nut connecting plate.

[0007] As a preferred embodiment, the torsion spring comprises a spiral torsion spring body, the upper end of the torsion spring body is connected to the upper spring wire, and the lower end of the torsion spring body is connected to the lower spring wire;

[0008] The upper spring wire has an upper spring wire horizontal section, and the upper spring wire horizontal section is in contact with the upper end surface of the nut; the central axis of the upper spring wire horizontal section faces the center of the nut body and forms an angle less than 50° with the horizontal center line of the nut stop block;

[0009] The lower end spring wire comprises a lower end spring wire horizontal section and a lower end spring wire vertical section, and the lower end spring wire horizontal section and the lower end spring wire vertical section are connected to form an L-shaped structure.

[0010] As a preferred embodiment, a plurality of nut connecting plate holes are provided on the nut connecting plate, and the lower end spring wire of the torsion spring can be embedded in the nut connecting plate hole and fixed thereto.

[0011] As a preferred embodiment, the upper spring wire further comprises an upper spring wire vertical section, and the upper spring wire vertical section is connected with the upper spring wire horizontal section to form an inverted L-shaped structure.

[0012] As a preferred embodiment, the height H1 between the upper spring wire and the lower spring wire of the torsion spring is smaller than the height H2 between the lower end surface of the nut connecting plate and the upper end surface of the nut, and the difference between the height H2 between the lower end surface of the nut connecting plate and the upper end surface of the nut and the height H1 between the upper spring wire and the lower spring wire of the torsion spring is less than 3 mm; the horizontal section of the lower spring wire is parallel to the lower end surface of the nut connecting plate.

[0013] As a preferred embodiment, a spring positioning platform is provided on the nut body, a spring positioning hole is opened on the spring positioning platform, and the spring wire at the lower end of the torsion spring can be embedded in the spring positioning hole and fixed thereto.

[0014] As a preferred embodiment, the height H1 between the upper spring wire and the lower spring wire of the torsion spring is smaller than the height H3 between the bottom end surface of the spring positioning platform and the upper end surface of the nut, and the difference between the height H3 between the bottom end surface of the spring positioning platform and the upper end surface of the nut and the height H1 between the upper spring wire and the lower spring wire of the torsion spring is less than 3 mm; the horizontal section of the lower spring wire is parallel to the bottom end surface of the spring positioning platform.

[0015] As a preferred embodiment, the inner diameter A1 of the torsion spring is larger than the outer diameter of the nut body, and the fitting clearance between the torsion spring and the nut body is not less than 0.2 mm; the spring wire diameter of the torsion spring is not larger than the height of the nut stop block protruding from the upper end surface of the nut.

[0016] As a preferred embodiment, a positioning ring is sleeved on the nut body, and the positioning ring is located above the nut connecting plate and is arranged in close contact with the nut connecting plate. A plurality of positioning protrusions are arranged on the outer periphery of the positioning ring.

[0017] The present invention also provides an electronic expansion valve, comprising the above-mentioned low-noise nut assembly, and also comprising a rotor assembly assembled with the low-noise nut assembly, wherein the rotor assembly comprises a screw, a rotor connecting plate and a rotor, wherein the screw, the rotor connecting plate and the rotor are coaxially arranged, the rotor connecting plate is embedded in the inner cavity of the rotor, and the screw passes through the middle of the rotor connecting plate and is connected thereto as a whole; a rotor stop block is arranged at the bottom of the rotor connecting plate, and the rotor stop block is staggered with the nut stop block;

[0018] When the rotor assembly is assembled with the low-noise nut assembly, the screw is screwed into the nut body and threadedly cooperates with the internal threaded hole. The upper spring wire of the torsion spring is placed between the rotor stop block and the nut stop block. The rotor assembly rotates under the action of electromagnetic force and can move up and down along the axial direction of the nut body, and is limited by the cooperation of the torsion spring and the nut stop block.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] Firstly, compared with the prior art solutions, the low-noise nut assembly of the present invention can not only solve the problem of valve needle stroke positioning of the electronic expansion valve, but also has a simple structure and low cost. At the same time, it can ensure that the electronic expansion valve has lower noise and reliable function during operation.

[0021] Secondly, after the nut assembly and the rotor assembly of the present invention are assembled, the rotor is pushed by the electromagnetic force and starts to rotate. Due to the combination relationship between the nut and the screw, the entire rotor assembly starts to move along the axial direction of the nut. It does not contact other parts during movement and will not generate additional noise or abnormal sound.

[0022] Thirdly, when the screw of the rotor assembly of the present invention rotates to a suitable position, the rotor stop block provided on the rotor connecting plate first contacts with the upper spring wire, and the rotor rotates at a low speed, overcoming the elastic force of the torsion spring and slowly rotating. When the upper spring wire contacts the nut stop block on the nut, the rotor assembly cannot rotate, thereby achieving the purpose of positioning the rotor moving position. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a low-noise nut assembly of a first embodiment;

[0024] Figure 2 It is a schematic diagram of the top view of the nut body of the first embodiment;

[0025] Figure 3 for Figure 2 Schematic diagram of the structure along the AA direction;

[0026] Figure 4 It is a schematic structural diagram of a torsion spring in a first embodiment;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the nut body of the first embodiment;

[0028] Figure 6 It is a schematic diagram of the top view of the structure of the nut connecting plate;

[0029] Figure 7 is a schematic cross-sectional structural diagram of a rotor assembly;

[0030] Figure 8 It is a schematic diagram of assembling a low-noise nut assembly and a rotor assembly according to a first embodiment;

[0031] Fig. 9 is a schematic diagram of the rotor assembly after rotating relative to the low-noise nut assembly in the first embodiment;

[0032] Fig.10 is a schematic structural diagram of a torsion spring in a second embodiment;

[0033] Fig.11 It is a structural schematic diagram of a nut body according to a second embodiment;

[0034] Fig.12 It is a schematic diagram of assembling a low-noise nut assembly and a rotor assembly according to a second embodiment;

[0035] Fig.13 is a schematic diagram of the rotor assembly after rotating relative to the low-noise nut assembly in the second embodiment;

[0036] In the figure, nut body 1, nut upper end face 11, nut lower end face 12, nut stop block 13, guide cavity 14, internal threaded hole 15, pressure balance hole 16, nut connecting plate 2, nut connecting plate hole 21, lower end face 22, torsion spring 3, upper spring wire 31, upper spring wire horizontal section 311, upper spring wire vertical section 312, lower spring wire 32, lower spring wire horizontal section 321, lower spring wire vertical section 322, spring positioning platform 4, spring positioning hole 41, bottom end face 42, positioning ring 5, positioning protrusion 51, screw 6, rotor connecting plate 7, rotor stop block 71, rotor 8. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below in conjunction with specific embodiments, but those skilled in the art will understand that the following embodiments are part of the embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] like Figure 1 to Figure 6 As shown, the low-noise nut assembly of the first embodiment of the present invention comprises a nut body 1, the nut body 1 has a nut upper end face 11 and a nut lower end face 12, a nut stopper 13 is arranged on the nut upper end face 11; a guide cavity 14 is arranged inside the nut body 1, an internal threaded hole 15 is arranged inside the guide cavity 14, and a pressure balance hole 16 is arranged at the bottom of the internal threaded hole 15. In order to improve the durability of the electronic expansion valve, the material of the nut body 1 is a self-lubricating material, and according to the requirements of cost and manufacturing process, the preferred material is PPS.

[0040] A nut connecting plate 2 is embedded in the lower part of the outer ring of the nut body 1, and a torsion spring 3 is sleeved on the upper part of the outer ring of the nut body 1; the torsion spring 3 has an upper spring wire 31 and a lower spring wire 32, the upper spring wire 31 extends upward to the upper end surface 11 of the nut and contacts it, and the lower spring wire 32 extends downward to be relatively fixed with the nut connecting plate 2, and a plurality of nut connecting plate holes 21 are opened on the nut connecting plate 2, and the lower spring wire 32 of the torsion spring 3 can be embedded in the nut connecting plate holes 21 and fixed thereto, preferably, the nut connecting plate holes 21 are U-shaped opening hole structures, the number is not less than 1, and preferably the number is 2. A positioning ring 5 is sleeved on the nut body 1, and the positioning ring 5 is located above the nut connecting plate 2 and is arranged in close contact with it, and a plurality of positioning protrusions 51 are arranged on the outer periphery of the positioning ring 5.

[0041] like Figure 4 As shown, the material of the torsion spring 3 needs to be non-ferromagnetic material, preferably SUS304 stainless steel. The torsion spring 3 includes a spiral torsion spring body 33, which is cylindrical. The upper end of the torsion spring body 33 is connected to the upper spring wire 31, and the lower end of the torsion spring body 33 is connected to the lower spring wire 32; the upper spring wire 31 has an upper spring wire horizontal section 311 and an upper spring wire vertical section 312, the upper spring wire vertical section 312 is connected with the upper spring wire horizontal section 311 to form an inverted L-shaped structure, and the upper spring wire horizontal section 311 is in contact with the upper end surface 11 of the nut; the central axis of the upper spring wire horizontal section 311 faces the center of the nut body 1, and forms an angle less than 50° with the horizontal center line of the nut stop block 13; the lower spring wire 32 has a lower spring wire horizontal section 321 and a lower spring wire vertical section 322, the lower spring wire horizontal section 321 and the lower spring wire vertical section 322 are connected to form an L-shaped structure.

[0042] like Figure 4 and Figure 5 As shown, the height H1 between the upper spring wire 31 and the lower spring wire 32 of the torsion spring 3 is less than the height H2 between the lower end surface of the nut connecting plate 2 and the upper end surface 11 of the nut, and the difference between the height H2 between the lower end surface of the nut connecting plate 2 and the upper end surface 11 of the nut and the height H1 between the upper spring wire 31 and the lower spring wire 32 of the torsion spring 3 is less than 3mm; the horizontal section 321 of the lower spring wire is parallel to the lower end surface 22 of the nut connecting plate 2. The inner diameter A1 of the torsion spring 3 is greater than the outer diameter of the nut body 1, and the fitting clearance between the torsion spring 3 and the nut body 1 is not less than 0.2mm; the spring wire diameter of the torsion spring 3 is not greater than the height of the nut stopper 13 protruding from the upper end surface 11 of the nut. The torsion spring 3 can be designed to be left-handed or right-handed.

[0043] like Figure 7 to Figure 13As shown, the low-noise nut assembly of the second embodiment of the present invention is different from the first embodiment in that a spring positioning platform 4 is provided on the nut body 1, and a spring positioning hole 41 is provided on the spring positioning platform 4, and the lower end spring wire 32 of the torsion spring 3 can be embedded in the spring positioning hole 41 and fixed thereto. The torsion spring 3 has an upper end spring wire horizontal section 311, and the upper end spring wire horizontal section 311 is in contact with the upper end surface 11 of the nut; the lower end spring wire 32 has a lower end spring wire horizontal section 321 and a lower end spring wire vertical section 322, and the lower end spring wire horizontal section 321 and the lower end spring wire vertical section 322 are connected to form an L-shaped structure. The height H1 between the upper spring wire 31 and the lower spring wire 32 of the torsion spring 3 is smaller than the height H3 between the bottom end surface of the spring positioning platform 4 and the upper end surface 11 of the nut, and the difference between the height H3 between the bottom end surface of the spring positioning platform 4 and the upper end surface 11 of the nut and the height H1 between the upper spring wire 31 and the lower spring wire 32 of the torsion spring 3 is less than 3 mm; the horizontal section 321 of the lower spring wire is parallel to the bottom end surface 42 of the spring positioning platform 4.

[0044] The present invention also provides an electronic expansion valve, comprising the low-noise nut assembly as described above, and also comprising a rotor assembly assembled with the low-noise nut assembly, a valve needle assembly and a valve seat, the valve seat is provided with a valve port, the rotor assembly is used to drive the valve needle assembly to move, so as to control the opening and closing area of ​​the valve port, thereby realizing the control of the refrigerant flow, and the valve needle assembly and the valve seat can adopt the existing structure. Figure 7 As shown, the rotor assembly includes a screw rod 6, a rotor connecting plate 7 and a rotor 8. The screw rod 6, the rotor connecting plate 7 and the rotor 8 are coaxially arranged. The rotor connecting plate 7 is embedded in the inner cavity of the rotor 8. The screw rod 6 passes through the middle of the rotor connecting plate 7 and is connected to it as a whole by welding. A rotor stop block 71 is provided at the bottom of the rotor connecting plate 7, and the rotor stop block 71 is staggered with the nut stop block 13.

[0045] When the rotor assembly is assembled with the low-noise nut assembly, the screw 6 is screwed into the nut body 1 and threadedly matched with the internal threaded hole 15. The upper end spring wire 31 of the torsion spring 3 is placed between the rotor stop block 71 and the nut stop block 13. The rotor assembly rotates under the action of electromagnetic force and can move up and down along the axial direction of the nut body, and is limited by the torsion spring 3 and the nut stop block 13.

[0046] After the low-noise nut assembly and the rotor assembly of the present invention are assembled, the rotor 8 is driven by the electromagnetic force to start rotating. Due to the combination relationship between the nut body 1 and the screw 6, the entire rotor assembly starts to move along the axial direction of the nut body 1. It does not contact other parts during movement, and no additional noise or abnormal sound is generated. When the screw rotates to a suitable position, the rotor stopper 71 provided on the rotor connecting plate 7 first contacts the upper spring wire 31. The rotor 8 rotates at a low speed and rotates slowly to overcome the elastic force of the torsion spring 3. When the upper spring wire 31 contacts the nut stopper 13 on the nut, the rotor assembly cannot rotate, thereby achieving the purpose of positioning the rotor moving position.

[0047] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0048] The shapes, sizes, ratios, angles, and numbers disclosed for describing various aspects of the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the following description, when the detailed description of the related known functions or configurations is determined to be unnecessarily obscuring the focus of the present specification and claims, the detailed description will be omitted.

[0049] The features of various embodiments of the present invention may be combined or spliced ​​with each other in part or in whole, and may be performed in various different configurations as those skilled in the art may fully understand. The embodiments of the present invention may be performed independently of each other, or may be performed together through interdependent relationships.

[0050] The above are only specific embodiments of the present invention. It should be pointed out that any changes or substitutions that can be easily thought of by any technician familiar with the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. The rest not described in detail are prior arts.

Claims

1. A low-noise nut assembly, characterized in that: The invention comprises a nut body (1), wherein the nut body (1) has a nut upper end surface (11) and a nut lower end surface (12), and a nut stop block (13) is arranged on the nut upper end surface (11); a guide cavity (14) is arranged inside the nut body (1), an internal threaded hole (15) is arranged inside the guide cavity (14), and a pressure balance hole (16) is arranged at the bottom of the internal threaded hole (15); A nut connecting plate (2) is embedded in the lower part of the outer ring of the nut body (1), and a torsion spring (3) is sleeved on the upper part of the outer ring of the nut body (1); the torsion spring (3) comprises an upper spring wire (31) and a lower spring wire (32), the upper spring wire (31) extending upward to contact the upper end surface (11) of the nut, and the lower spring wire (32) extending downward to be relatively fixed to the nut body (1) and / or the nut connecting plate (2).

2. The low-noise nut assembly according to claim 1, characterized in that: The torsion spring (3) comprises a spiral torsion spring body (33), the upper end of the torsion spring body (33) is connected to the upper spring wire (31), and the lower end of the torsion spring body (33) is connected to the lower spring wire (32); The upper spring wire (31) has an upper spring wire horizontal section (311), and the upper spring wire horizontal section (311) is in contact with the upper end surface (11) of the nut; the central axis of the upper spring wire horizontal section (311) faces the center of the nut body (1) and forms an angle of less than 50° with the horizontal center line of the nut stop block (13); The lower end spring wire (32) comprises a lower end spring wire horizontal section (321) and a lower end spring wire vertical section (322), and the lower end spring wire horizontal section (321) and the lower end spring wire vertical section (322) are connected to form an L-shaped structure.

3. The low noise nut assembly according to claim 2, characterized in that: The nut connecting plate (2) is provided with a plurality of nut connecting plate holes (21), and the lower end spring wire (32) of the torsion spring (3) can be embedded in the nut connecting plate hole (21) and fixed thereto.

4. The low noise nut assembly according to claim 3, characterized in that: The upper spring wire (31) also has an upper spring wire vertical section (312), and the upper spring wire vertical section (312) is connected with the upper spring wire horizontal section (311) to form an inverted L-shaped structure.

5. The low noise nut assembly according to claim 4, characterized in that: The height H1 between the upper spring wire (31) and the lower spring wire (32) of the torsion spring (3) is smaller than the height H2 between the lower end surface of the nut connecting plate (2) and the upper end surface (11) of the nut, and the difference between the height H2 between the lower end surface of the nut connecting plate (2) and the upper end surface (11) of the nut and the height H1 between the upper spring wire (31) and the lower spring wire (32) of the torsion spring (3) is smaller than 3 mm; the lower end spring wire horizontal section (321) is parallel to the lower end surface (22) of the nut connecting plate (2).

6. The low noise nut assembly according to claim 2, characterized in that: A spring positioning platform (4) is arranged on the nut body (1), and a spring positioning hole (41) is opened on the spring positioning platform (4). The lower end spring wire (32) of the torsion spring (3) can be embedded in the spring positioning hole (41) and fixed thereto.

7. The low noise nut assembly according to claim 6, characterized in that: The height H1 between the upper spring wire (31) and the lower spring wire (32) of the torsion spring (3) is smaller than the height H3 between the bottom end surface of the spring positioning platform (4) and the upper end surface (11) of the nut, and the difference between the height H3 between the bottom end surface of the spring positioning platform (4) and the upper end surface (11) of the nut and the height H1 between the upper spring wire (31) and the lower spring wire (32) of the torsion spring (3) is smaller than 3 mm; the horizontal section (321) of the lower spring wire is parallel to the bottom end surface (42) of the spring positioning platform (4).

8. The low-noise nut assembly according to any one of claims 1 to 7, characterized in that: The inner diameter A1 of the torsion spring (3) is larger than the outer diameter of the nut body (1), and the matching clearance between the torsion spring (3) and the nut body (1) is not less than 0.2 mm; the spring wire diameter of the torsion spring (3) is not larger than the height of the nut stop block (13) protruding from the upper end surface (11) of the nut.

9. The low-noise nut assembly according to any one of claims 1 to 7, characterized in that: A positioning ring (5) is sleeved on the nut body (1). The positioning ring (5) is located above the nut connecting plate (2) and is arranged in close contact with it. A plurality of positioning protrusions (51) are arranged on the outer periphery of the positioning ring (5).

10. An electronic expansion valve, characterized in that: A low-noise nut assembly according to any one of claims 1 to 9, further comprising a rotor assembly assembled with the low-noise nut assembly, wherein the rotor assembly comprises a screw rod (6), a rotor connecting plate (7) and a rotor (8), wherein the screw rod (6), the rotor connecting plate (7) and the rotor (8) are coaxially arranged, the rotor connecting plate (7) is embedded in the inner cavity of the rotor (8), and the screw rod (6) passes through the middle of the rotor connecting plate (7) and is integrally connected thereto; a rotor stop block (71) is arranged at the bottom of the rotor connecting plate (7), and the rotor stop block (71) is staggered with the nut stop block (13); When the rotor assembly is assembled with the low-noise nut assembly, the screw rod (6) is screwed into the nut body (1) and is threadedly matched with the internal threaded hole (15), and the upper end spring wire (31) of the torsion spring (3) is placed between the rotor stop block (71) and the nut stop block (13). The rotor assembly rotates under the action of electromagnetic force and can move up and down along the axial direction of the nut body, and is limited by the torsion spring (3) and the nut stop block (13).

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