CN116538336A - Nut assembly and electronic expansion valve - Google Patents

Abstract

The invention provides a nut component and an electronic expansion valve, wherein the nut component comprises: a nut body; the limiting structure is arranged on the outer peripheral surface of the nut main body in a protruding mode and is provided with a limiting surface; the limit spring comprises a spiral guide rail and a limit section which are connected with each other, the spiral guide rail is arranged around the nut main body, the limit section is in limit fit with the nut main body, and a spiral guide groove is formed in the area between the spiral guide rail and the outer side wall of the nut main body; the stop ring is rotatably arranged in the spiral guide groove and is provided with a stop end, and the stop end is in stop fit with the limit surface; under the condition that the stop end is abutted with the limiting surface, the stop end and the limiting section are both positioned on the same side of the limiting surface. According to the technical scheme provided by the invention, the problem that in the prior art, the stop end enters a gap between the nut guide groove and the limiting structure to cause the nut assembly to be blocked can be solved.

Description

Nut assembly and electronic expansion valve

Technical Field

The invention relates to the technical field of electronic expansion valves, in particular to a nut assembly and an electronic expansion valve.

Background

To the nut subassembly of electronic expansion valve among the prior art, the mode that adopts limit structure and spacing spring butt to carry out spacingly to limit spring's axial generally, limit structure has spacing face, and limit spring has spacing section, and the stop ring has the backstop end, and spacing face and backstop end backstop cooperation, under the circumstances of backstop end and spacing face butt, backstop end and spacing section are located the both sides of spacing face, and nut guide rail and limit structure interval or butt on the plane that the axis of nut main part is located. However, due to the fact that the machining precision of the limiting spring is difficult to guarantee, the situation that the spiral guide groove and the limiting structure are spaced and are large in distance can occur, the stop end enters a gap between the spiral guide groove and the limiting structure, and the nut assembly is blocked.

Disclosure of Invention

The invention provides a nut component and an electronic expansion valve, which are used for solving the problem that a stop end in the prior art enters a gap between a nut guide groove and a limiting structure to cause the nut component to be blocked.

In order to solve the above-described problems, according to an aspect of the present invention, there is provided a nut assembly including: a nut body; the limiting structure is arranged on the outer peripheral surface of the nut main body in a protruding mode and is provided with a limiting surface; the limit spring comprises a spiral guide rail and a limit section which are connected with each other, the spiral guide rail is arranged around the nut main body, the limit section is in limit fit with the nut main body, and a spiral guide groove is formed in the area between the spiral guide rail and the outer side wall of the nut main body; the stop ring is rotatably arranged in the spiral guide groove and is provided with a stop end, and the stop end is in stop fit with the limit surface; under the condition that the stop end is abutted with the limiting surface, the stop end and the limiting section are both positioned on the same side of the limiting surface.

Further, in the axial direction of the nut body, the spiral guide rail is provided with opposite faces towards the position of the limiting structure, the maximum distance between the opposite faces and the limiting structure is A, the radial dimension of the stop end is D, and D is more than A.

Further, in the direction from the spiral guide rail being close to the limit structure to the spiral guide rail being far away from the limit structure, the spiral guide rail comprises a first circle and a second circle which are connected with each other, and under the condition that the stop end is abutted with the limit surface, the stop end is located between the first circle and the second circle.

Further, the limit spring further comprises a first folding hook, wherein the first folding hook is arranged at one end, far away from the limit structure, of the spiral guide rail, and the check ring is matched with the stop of the first folding hook.

Further, the stop ring comprises a screw and a stop section arranged at one end of the screw, the screw is rotatably arranged in the screw guide groove, the stop section is matched with the first folding hook stop, and the stop end is located at one end of the screw away from the stop section.

Further, the nut assembly further comprises a connecting plate, the radial dimension of the connecting plate is larger than that of the nut main body, the connecting plate is in limit fit with the nut main body, and the limit section is in limit fit with the nut main body and the connecting plate.

Further, the limiting section comprises a locating section and a mounting section which are mutually connected, one end of the locating section is connected with one end of the spiral guide rail, the locating section is in limiting fit with the nut main body, and the mounting section is in limiting fit with the connecting plate.

Further, the installation section extends along the axis direction of the nut main body, the limiting spring further comprises a second folding hook, the second folding hook is connected with the installation section, the second folding hook is perpendicular to the installation section, the connecting plate is provided with a clamping groove, the installation section is arranged in the clamping groove in a penetrating mode, and the second folding hook is located on one side, away from the limiting structure, of the connecting plate and is in butt joint with the connecting plate.

Further, the nut main part is including the nut section, toper section, the linkage segment that connect gradually, and the radial dimension of linkage segment is greater than the radial dimension of nut section, toper section, and spiral guide rail sets up around the nut section, and limit structure protrusion sets up on nut section and toper section, limit section and toper section butt, and the connecting plate setting is on the linkage segment.

According to another aspect of the present invention, there is provided an electronic expansion valve comprising a valve body assembly and the nut assembly described above, the nut assembly being disposed within a cavity of the valve body assembly.

By applying the technical scheme of the invention, the nut assembly comprises: a nut body; the limiting structure is arranged on the outer peripheral surface of the nut main body in a protruding mode and is provided with a limiting surface; the limit spring comprises a spiral guide rail and a limit section which are connected with each other, the spiral guide rail is arranged around the nut main body, the limit section is in limit fit with the nut main body, and a spiral guide groove is formed in the area between the spiral guide rail and the outer side wall of the nut main body; the stop ring is rotatably arranged in the spiral guide groove and is provided with a stop end, and the stop end is in stop fit with the limit surface; under the condition that the stop end is abutted with the limiting surface, the stop end and the limiting section are both positioned on the same side of the limiting surface. By adopting the scheme, a part of the limit structure and a part of the spiral guide rail are overlapped in the axial direction of the nut main body, so that the stop end of the stop ring is matched with the stop of the limit surface, the situation that the stop end and the limit section are respectively positioned at two sides of the limit surface after the stop end and the limit surface are abutted in the prior art is avoided, the stop end enters the spiral guide rail and the limit structure in a gap generated in the axial direction of the nut main body due to the processing problem of the limit spring in the stop process, and the nut component is blocked, so that the scheme improves the reliability of the nut component, and meanwhile, the processing requirement on the limit spring is reduced, and the processing cost of the nut component is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 shows a schematic structural view of a nut assembly provided by an embodiment of the present invention;

fig. 2 shows an exploded view of the nut assembly of fig. 1.

Wherein the above figures include the following reference numerals:

10. a nut body; 11. a nut section; 12. a conical section; 13. a connection section;

20. a limit structure; 21. a limiting surface;

30. a limit spring; 31. a spiral guide rail; 311. a first turn; 312. a second turn; 32. a first folding hook; 33. a limiting section; 331. a positioning section; 332. a mounting section; 34. an opposite face; 35. a second folding hook;

40. a check ring; 41. a stop end; 42. a screw; 43. a stop section;

50. a connecting plate; 51. and a clamping groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 and 2, an embodiment of the present invention provides a nut assembly including: a nut body 10; the limiting structure 20 is arranged on the outer peripheral surface of the nut body 10 in a protruding mode, and the limiting structure 20 is provided with a limiting surface 21; the limit spring 30, the limit spring 30 includes the spiral guide rail 31 and limit section 33 that interconnect, the spiral guide rail 31 is set up around nut body 10, limit section 33 cooperates with limit of nut body 10, the area between outer sidewall of the nut body 10 and the spiral guide rail 31 forms the spiral guide slot; a stop ring 40, wherein the stop ring 40 is rotatably arranged in the spiral guide groove, the stop ring 40 is provided with a stop end 41, and the stop end 41 is in stop fit with the limit surface 21; when the stop end 41 and the stop surface 21 abut, the stop end 41 and the stop section 33 are both located on the same side of the stop surface 21.

By adopting the scheme, a part of the limit structure 20 and a part of the spiral guide rail 31 are overlapped in the axial direction of the nut main body 10, so that the stop end 41 of the stop ring 40 is matched with the stop of the limit surface 21, the situation that the stop end 41 is abutted with the limit surface 21 in the prior art is avoided, the stop end 41 and the limit section 33 are respectively positioned at two sides of the limit surface 21, the stop end 41 is in the stop process, the stop ring 40 enters a gap generated in the axial direction of the nut main body 10 by the aid of the limit spring 30 due to the processing problem of the limit spring 30, and further, the nut assembly is blocked, the reliability of the nut assembly is improved, meanwhile, the processing requirement on the limit spring 30 is reduced, and the processing cost of the nut assembly is reduced.

As shown in fig. 2, in the axial direction of the nut body 10, the spiral guide rail 31 has an opposite surface 34 at a position facing the limit structure 20, a maximum distance between the opposite surface 34 and the limit structure 20 is a, and a radial dimension of the stopper end 41 is D, D > a. The arrangement prevents the stop end of the stop ring 40 from entering the gap between the opposite surface 34 and the limiting structure 20, prevents the stop ring 40 from being blocked, and ensures the reliability of the nut assembly.

Specifically, in a direction from the approach of the spiral guide rail 31 to the limit structure 20 to the separation of the spiral guide rail 31 from the limit structure 20, the spiral guide rail 31 includes a first turn 311 and a second turn 312 connected to each other, and in a case where the stopper end 41 abuts against the limit surface 21, the stopper end 41 is located between the first turn 311 and the second turn 312.

In this embodiment, the first ring 311 and the limiting structure 20 are overlapped on the plane where the axis of the nut body 10 is located, and the second ring 312 and the opposite surface 34 are spaced or abutted, so that a part of the limiting surface 21 is located between the first ring 311 and the second ring 312, so that the stop end 41 of the stop ring 40 in the first ring 311 and the second ring 312 can be necessarily abutted with the part of the limiting surface 21, and limiting of the stop ring 40 by the limiting structure 20 is realized.

Alternatively, the opposite surface 34 is located on the second ring 312, and the limiting structure 20 is a limiting block, and the limiting surface 21 is a sidewall surface of the limiting block along the circumferential direction of the nut body 10, which is close to the side of the stop end 41.

Further, the limiting spring 30 further includes a first folding hook 32, the first folding hook 32 is disposed at an end of the spiral guide rail 31 away from the limiting structure 20, and the stop ring 40 is in stop fit with the first folding hook 32. By this arrangement, the stopper ring 40 is restricted from moving in the axial direction of the nut body 10 by the stopper engagement of the first snap hook 32 and the stopper ring 40, and the stopper ring 40 is prevented from coming out of the spiral guide groove, thereby ensuring the reliability of the nut assembly.

As shown in fig. 2, the stop ring 40 includes a screw member 42 and a stop section 43 disposed at one end of the screw member 42, the screw member 42 is rotatably disposed in the screw guide groove, the stop section 43 is in stop engagement with the first hinge 32, and the stop end 41 is located at an end of the screw member 42 remote from the stop section 43.

In this embodiment, by the stop engagement of the stop section 43 and the first folding hook 32, the situation that one end of the screw member 42 is directly stopped by the first folding hook 32, and the stop impact causes the screw member 42 or the first folding hook 32 to generate powder, the powder enters the screw guide groove to stop the rotation of the stop ring 40 is avoided. Specifically, the outer circumferential surface of the stop section 43 is in stop fit with the outer circumferential surface of the first hinge 32, so that the stop area is increased, and the reliability of the stop and the service lives of the stop ring 40 and the stop spring 30 are ensured.

As shown in fig. 1 and 2, the nut assembly further includes a connection plate 50, the radial dimension of the connection plate 50 is larger than the radial dimension of the nut body 10, the connection plate 50 is in limit fit with the nut body 10, and the limit section 33 is in limit fit with both the nut body 10 and the connection plate 50.

In the present embodiment, the nut body 10 and the connection plate 50 are of a nested structure, and the movement of the stopper spring 30 in the axial direction of the nut body 10 is restricted by the stopper engagement of the stopper section 33 and the nut body 10. The rotation of the limit spring 30 in the circumferential direction of the nut body 10 is restricted by the limit fit of the limit segment 33 and the connection plate 50. By means of the arrangement, the relative positions of the nut body 10 and the limiting spring 30 are guaranteed through the connecting plate 50, relative displacement of the nut body 10 and the limiting spring 30 is prevented, and reliability of the nut assembly is guaranteed.

Optionally, the nut body 10 and the connecting plate 50 are in a split structure, and the nut assembly further includes a limiting plate connected to the nut body 10, wherein a radial dimension of the limiting plate is greater than a radial dimension of the nut body 10. The setting like this for connecting plate 50 detachably cup joints on the outer peripheral face of nut main part 10 and with limiting plate butt, need put into the condition of connecting plate when having avoided carrying out the inserts to the nut subassembly among the prior art, make nut main part and connecting plate can independent machine-shaping respectively and make up together, avoided the unable secondary feed back of nut main part that has the connecting plate to use the condition simultaneously, make nut main part 10 can better secondary feed back use, improved the production efficiency of nut subassembly.

Optionally, the nut main body 10 and the connecting plate 50 are of a split structure, the nut main body 10 is provided with a plurality of limiting bosses, the limiting bosses are arranged around the nut main body 10, the inner wall of the connecting plate 50 is provided with a plurality of limiting grooves, and the limiting bosses are correspondingly penetrated in the limiting grooves one by one. The setting like this, through the spacing cooperation of multiunit spacing boss and spacing groove, improved the reliability that nut main part 10 and connecting plate 50 are connected, through the one-to-one of a plurality of spacing grooves and a plurality of spacing boss, also can confirm the relative position of connecting plate 50 and nut main part 10 better simultaneously, prevent that connecting plate 50 and nut main part 10 from eccentrically setting, guarantee the axiality of connecting plate 50 and nut main part 10. Specifically, the limit boss is provided on the limit plate and the nut body 10, and the limit groove is provided on the inner ring of the connection plate 50.

Specifically, the limiting section 33 includes a positioning section 331 and a mounting section 332 that are connected to each other, one end of the positioning section 331 is connected to one end of the spiral guide rail 31, the positioning section 331 is in a limiting fit with the nut body 10, and the mounting section 332 is in a limiting fit with the connecting plate 50.

In the present embodiment, the movement of the stopper spring 30 in the axial direction of the nut body 10 is restricted by the stopper engagement of the positioning section 331 and the nut body 10. The rotation of the limit spring 30 in the circumferential direction of the nut body 10 is limited by the limit fit of the mounting section 332 and the nut body 10, and the reliability of the nut assembly is ensured.

Further, the mounting section 332 extends along the axial direction of the nut body 10, the limiting spring 30 further includes a second folding hook 35, the second folding hook 35 is connected with the mounting section 332, the second folding hook 35 is perpendicular to the mounting section 332, the connecting plate 50 has a clamping groove 51, the mounting section 332 is inserted into the clamping groove 51, and the second folding hook 35 is located at one side of the connecting plate 50 away from the limiting structure 20 and is abutted to the connecting plate 50.

In this embodiment, the mounting section 332 penetrating the locking groove 51 limits the rotation of the limit spring 30 along the circumferential direction of the nut body 10, and the second folding hook 35 perpendicular to the mounting section 332 abuts against the connecting plate 50 to limit the movement of the limit spring 30 along the axial direction of the nut body 10, so as to prevent the limit spring 30 from being separated from the outer circumferential surface of the nut body 10, and ensure the reliability of the nut assembly.

Specifically, the nut body 10 includes a nut section 11, a tapered section 12, a connecting section 13 connected in this order, the radial dimension of the connecting section 13 is larger than the radial dimension of the nut section 11, the tapered section 12, the spiral guide rail 31 is disposed around the nut section 11, the limit structure 20 is disposed on the nut section 11 and the tapered section 12 in a protruding manner, the limit section 33 is abutted with the tapered section 12, and the connecting plate 50 is disposed on the connecting section 13.

In this embodiment, the radial dimension of the connecting section 13 is greater than the radial dimension of the nut section 11, in the direction from the nut section 11 to the connecting section 13, the radial dimension of the tapered section gradually increases, the positioning section 331 of the limiting section 33 abuts against the tapered section 12, the tapered section 12 is a truncated cone section, the positioning section 331 is obliquely arranged relative to the axis of the nut body 10, and the inclination angle is adapted to the inclined plane of the truncated cone section, so that the reliability of the nut assembly is ensured because the radial dimension of the tapered section 12 gradually increases in the direction from the nut section 11 to the connecting section 13, so that the spiral guide rail 31 connected with the positioning section 331 cannot be sleeved on the tapered section 12, thereby limiting the movement of the limiting spring 30 in the axial direction of the nut body 10.

Specifically, the displacement of the limiting spring 30 along the two directions of the axis of the nut main body 10 is limited by the limiting cooperation of the positioning section 331 and the conical section 12 and the abutting connection of the mounting section 332/the second folding hook 35 and the connecting plate 50, so that the situation that the limiting spring 30 moves greatly or even is separated after being mounted is prevented, and the reliability of the nut assembly is ensured.

Optionally, a stop structure 20 is provided on the conical section 12 and the connecting section 13.

Another embodiment of the present invention provides an electronic expansion valve, including a valve body assembly and the nut assembly described above, where the nut assembly is disposed in a cavity of the valve body assembly.

Optionally, the valve body assembly includes a valve cap and a valve seat that are connected to each other, the check ring 40 and the stop structure 20 are both located in the cavity of the valve cap, a portion of the nut body 10 and a portion of the stop spring 30 are located in the cavity of the valve seat, another portion of the nut body 10 and another portion of the stop spring 30 are located in the cavity of the valve cap, and the connection plate 50 is welded to the valve seat.

Optionally, the electronic expansion valve further includes a rotor assembly, the rotor assembly is disposed in the cavity of the valve cover, the rotor assembly includes a rotor connecting plate, a guiding plate and a cylindrical magnetic rotor, the rotor connecting plate is disposed in the cavity of the magnetic rotor and fixedly connected with the magnetic rotor, the guiding plate is disposed in the cavity of the magnetic rotor and fixedly connected with the rotor connecting plate, and the guiding plate is in limit fit with the stop ring 40. In this embodiment, the rotor connecting plate and the magnetic rotor are driven by the external coil to rotate synchronously, so as to drive the guide plate fixedly connected with the rotor connecting plate to rotate synchronously and move along the axis direction of the nut body 10, and during the movement of the guide plate, the guide plate is abutted against the stop ring 40, so as to drive the stop ring 40 to move helically on the nut body 10. Specifically, a gap is formed between the guide plate and the inner side wall of the cavity of the magnetic rotor, so that the situation that the guide plate rubs against the cavity of the magnetic rotor in the rotation process is avoided, and the magnetic rotor is arranged in the cavity of the valve cover and is in clearance fit with the inner side wall of the valve cover. Alternatively, there may be no gap between the guide plate and the magnetic rotor, and the material of the guide plate is different from that of the guide plate.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A nut assembly, comprising:

a nut body (10);

the limiting structure (20) is arranged on the outer peripheral surface of the nut main body (10) in a protruding mode, and the limiting structure (20) is provided with a limiting surface (21);

a limit spring (30), wherein the limit spring (30) comprises a spiral guide rail (31) and a limit section (33) which are connected with each other, the spiral guide rail (31) is arranged around the nut main body (10), the limit section (33) is in limit fit with the nut main body (10), and a spiral guide groove is formed in an area between the spiral guide rail (31) and the outer side wall of the nut main body (10);

a stop ring (40), wherein the stop ring (40) is rotatably arranged in the spiral guide groove, the stop ring (40) is provided with a stop end (41), and the stop end (41) is in stop fit with the limit surface (21);

under the condition that the stop end (41) is abutted with the limiting surface (21), the stop end (41) and the limiting section (33) are located on the same side of the limiting surface (21).

2. Nut assembly according to claim 1, characterized in that in the axial direction of the nut body (10) the position of the helical guide (31) towards the limit structure (20) has an opposite face (34), the maximum distance between the opposite face (34) and the limit structure (20) being a, the radial dimension of the stop end (41) being D, D > a.

3. Nut assembly according to claim 1, characterized in that the screw guide (31) comprises a first turn (311) and a second turn (312) connected to each other in a direction from the screw guide (31) approaching the limit structure (20) to the screw guide (31) being distant from the limit structure (20), the stop end (41) being located between the first turn (311) and the second turn (312) with the stop end (41) and the limit surface (21) abutting.

4. Nut assembly according to claim 1, characterized in that the limit spring (30) further comprises a first folding hook (32), the first folding hook (32) being arranged at the end of the helical track (31) remote from the limit structure (20), the stop ring (40) and the first folding hook (32) being in stop fit.

5. Nut assembly according to claim 4, characterized in that the stop ring (40) comprises a screw (42) and a stop section (43) arranged at one end of the screw (42), the screw (42) being rotatably arranged in the screw channel, the stop section (43) being in stop fit with the first folding hook (32), the stop end (41) being located at the end of the screw (42) remote from the stop section (43).

6. Nut assembly according to claim 1, characterized in that it further comprises a web (50), the radial dimension of the web (50) being greater than the radial dimension of the nut body (10), the web (50) and the nut body (10) being in a positive fit, the positive segments (33) being in a positive fit with both the nut body (10) and the web (50).

7. Nut assembly according to claim 6, characterized in that the limit section (33) comprises a positioning section (331) and a mounting section (332) which are connected to each other, one end of the positioning section (331) is connected to one end of the spiral guide rail (31), the positioning section (331) is in limit fit with the nut body (10), and the mounting section (332) is in limit fit with the connecting plate (50).

8. Nut assembly according to claim 7, characterized in that the mounting section (332) extends in the axial direction of the nut body (10), the limit spring (30) further comprises a second folding hook (35), the second folding hook (35) is connected with the mounting section (332), the second folding hook (35) is perpendicular to the mounting section (332), the connecting plate (50) is provided with a clamping groove (51), the mounting section (332) is arranged in the clamping groove (51) in a penetrating way, and the second folding hook (35) is located on one side, deviating from the limit structure (20), of the connecting plate (50) and is abutted with the connecting plate (50).

9. Nut assembly according to claim 6, characterized in that the nut body (10) comprises a nut section (11), a conical section (12) and a connecting section (13) which are connected in sequence, the radial dimension of the connecting section (13) is larger than the radial dimension of the nut section (11) and the conical section (12), the spiral guide rail (31) is arranged around the nut section (11), the limiting structure (20) is arranged on the nut section (11) and the conical section (12) in a protruding manner, the limiting section (33) is abutted with the conical section (12), and the connecting plate (50) is arranged on the connecting section (13).

10. An electronic expansion valve comprising a valve body assembly and the nut assembly of any one of claims 1 to 9 disposed within a cavity of the valve body assembly.