Stop mechanism and electronic expansion valve

Abstract

The utility model relates to the technical field of electronic expansion valves, in particular to a stop mechanism and an electronic expansion valve. The stop mechanism comprises a nut, a threaded guide rail, a sliding ring, a sliding ring extending part and a stop rod. The threaded guide rail is spirally and fixedly arranged on the nut along the height direction of the nut; the sliding ring is movably arranged in a guide rail sliding groove of the threaded guide rail in the extending direction of the threaded guide rail. The top of the threaded guide rail is provided with an upper stop part, and the bottom of the threaded guide rail is provided with a lower stop part; the sliding ring is provided with a sliding ring extending part, the top of the stop rod can be connected with the magnet, and the bottom of the stop rod can abut against the sliding ring extending part. The stop rod is configured to rotate along with the magnet, and the slip ring extending part drives the slip ring to slide up and down between the upper stop part and the lower stop part. In this way, the problems that in the prior art, the slip ring is likely to slip off, the stopping effect is poor, and cost is high can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic expansion valve technical field, specifically, relate to a stop mechanism and electronic expansion valve. BACKGROUND

[0002] Generally, the rotor assembly of the electronic expansion valve is used to drive the valve needle assembly to move to control the opening and closing of the valve port, and the stop mechanism is used to control the rotation number of the rotor to control the position of the valve needle. The stop mechanism includes a nut seat, a limiting spring, a sliding ring, a stop rod and a stop point, the stop point is arranged at the upper and lower positions of the limiting spring, and the sliding ring moves in the axial direction of the nut seat. When the sliding ring moves to the top and bottom of the limiting spring, the sliding ring will abut against the limiting spring to realize the upper stop and lower stop, thereby realizing the effect of limiting the rotation number of the rotor assembly.

[0003] However, in the prior art, the rotation number of the sliding ring depends on the wire track number of the limiting spring, which has the following disadvantages:

[0004] If the number of the limiting spring is to be increased, the wire diameter of the limiting spring can only be reduced without changing the height of the nut seat. After the wire diameter is reduced, the strength of the limiting spring will be reduced, and when the limiting spring is used to stop the sliding ring, the sliding ring has the risk of slipping off. Moreover, when the sliding ring is in the upper stop, the limiting spring will have a large torsional deformation due to the reduced strength, and the deformation of the spring will cause a certain offset to deviate the upper stop position, thereby affecting the flow control accuracy. The vibration of the upper stop is very large, and in severe cases, the stop will fail. Therefore, the prior art has the problem of poor stop effect. UTILITY MODEL CONTENTS

[0005] The utility model aims to improve, for example, a stop mechanism and an electronic expansion valve, which can improve the risk of the sliding ring slipping off and the poor stop effect in the prior art.

[0006] The embodiments of the utility model can be implemented as follows:

[0007] In a first aspect, the utility model improves a stop mechanism, which comprises:

[0008] a nut, a threaded guide rail, a sliding ring, a sliding ring extension, and a stop rod;

[0009] The threaded guide rail is spirally fixed to the nut along the height direction of the nut;

[0010] The sliding ring is movably arranged in the guide rail sliding groove of the threaded guide rail along the extension direction of the threaded guide rail; the top of the threaded guide rail is provided with an upper stop position, and the bottom of the threaded guide rail is provided with a lower stop position;

[0011] The slip ring has a slip ring extension part extending towards a direction away from the nut;

[0012] The top of the stop rod is connectable with the magnet, and the bottom of the stop rod is abuttable against the slip ring extension part; the stop rod is configured to rotate with the magnet, and the slip ring extension part drives the slip ring to slide up and down between the upper stop position part and the lower stop position part.

[0013] In an optional embodiment, the threaded guide rail is integrally formed with the nut.

[0014] In an optional embodiment, the upper stop position part and the lower stop position part are integrally formed with the nut.

[0015] In an optional embodiment, the upper stop position part and the lower stop position part are limiting protrusions arranged in a guide rail sliding groove of the threaded guide rail.

[0016] In an optional embodiment, the limiting protrusion closes the guide rail sliding groove in the extension direction of the threaded guide rail, and the outer wall of the limiting protrusion is flush with the outer wall of the threaded guide rail.

[0017] In an optional embodiment, first and second notched parts are further included, and the first and second notched parts extend in the height direction of the nut; in the radial direction of the nut, the first and second notched parts extend towards the central axis of the nut.

[0018] In an optional embodiment, in the radial direction of the nut, the first and second notched parts are arranged on both sides of the central axis of the nut.

[0019] In an optional embodiment, the first and second notched parts are notched planes formed in the outer wall of the nut, and the notched planes extend in the central axis direction of the nut; the distance between the notched planes and the central axis of the nut is less than the radius of the nut.

[0020] In an optional embodiment, a mounting part is further included, and the mounting part is arranged at the top of the threaded guide rail; and in the extension direction of the threaded guide rail, the mounting part is located at one end of the upper stop position part close to the lower stop position part.

[0021] In an optional embodiment, the spiral-shaped slip ring further includes a bending part at the end of the slip ring away from the slip ring extension part; and the bending part extends towards a direction away from the center of the slip ring.

[0022] In a second aspect, the utility model provides an electronic expansion valve, and the electronic expansion valve comprises the stop mechanism in any one of the foregoing embodiments.

[0023] The beneficial effects of the embodiments of the present application include, for example:

[0024] The stop mechanism comprises a nut, a threaded guide rail, a sliding ring, a sliding ring extension, and a stop rod. The threaded guide rail is fixedly arranged on the nut in a spiral manner. In the height direction of the nut, the two ends of the threaded guide rail are respectively provided with an upper stop portion and a lower stop portion, and the rotation range of the sliding ring is limited between the upper stop portion and the lower stop portion, thereby limiting the number of rotations of the magnet. Therefore, when the number of limit cycles is to be increased, the nut rail arm can be thinned without changing the height of the nut seat, which can increase the number of limit cycles without the risk of sliding ring slipping. Compared with the spring guide rail as the sliding ring guide rail in the prior art, the spring guide rail is movably arranged on the nut. The present scheme eliminates the separate spring guide rail mode and directly fixes the threaded guide rail on the nut. On the one hand, it reduces the spring guide rail part, thereby reducing the cost and simplifying the assembly process of the threaded guide rail, and also reducing the management cost. On the other hand, it can also improve the existing technology that the spring guide rail will produce a deviation after being limited, which will affect the flow control accuracy and cause the stop to fail due to large vibration. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 The structure diagram of the stop mechanism of the embodiments of the present application;

[0027] Figure 2 The structure diagram of the stop mechanism of the embodiments of the present application from another perspective;

[0028] Figure 3 The structure diagram of the nut of the embodiments of the present application;

[0029] Figure 4 The structure diagram of the nut of the embodiments of the present application from another perspective;

[0030] Figure 5 The structure diagram of the sliding ring of the embodiments of the present application;

[0031] Icon: 10 - stop mechanism; 100 - nut; 200 - threaded guide rail; 201 - guide rail slot; 210 - upper stop portion; 220 - lower stop portion; 300 - sliding ring; 310 - sliding ring extension; 320 - bent portion; 400 - stop rod; 510 - first notch portion; 520 - second notch portion; 530 - notch plane; 600 - mounting portion; 610 - bevel. DETAILED DESCRIPTION

[0032] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application raised in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0034] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0036] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0038] Please refer to Figure 1 The present embodiment improves a stop mechanism 10, which comprises a nut 100, a threaded guide rail 200, a sliding ring 300, a sliding ring extension 310, and a stop rod 400.

[0039] The threaded guide rail 200 is spirally fixed on the nut 100 along the height direction of the nut 100;

[0040] The sliding ring 300 is movably arranged in the guide rail sliding groove 201 of the threaded guide rail 200 along the extension direction of the threaded guide rail 200; the top of the threaded guide rail 200 is provided with an upper stop position part 210, and the bottom of the threaded guide rail 200 is provided with a lower stop position part 220;

[0041] The sliding ring 300 has a sliding ring extension part 310 extending away from the nut 100;

[0042] The top of the stop rod 400 can be connected with the magnet, and the bottom of the stop rod 400 can abut against the sliding ring extension part 310; the stop rod 400 is configured to be able to rotate with the magnet, and the sliding ring extension part 310 drives the sliding ring 300 to slide up and down between the upper stop position part 210 and the lower stop position part 220.

[0043] The stop mechanism 10 of the scheme includes the nut 100, the threaded guide rail 200, the sliding ring 300, the sliding ring extension part 310, and the stop rod 400. The threaded guide rail 200 is spirally fixed on the nut 100. Along the height direction of the nut 100, the two ends of the threaded guide rail 200 are respectively provided with the upper stop position part 210 and the lower stop position part 220, and the rotation range of the sliding ring 300 is limited between the upper stop position part 210 and the lower stop position part 220, so as to limit the number of rotations of the magnet. Therefore, when the number of limited rotations is to be increased, the arm of the nut 100 can be thinned without changing the height of the nut 100, so that the number of limited rotations can be increased without the risk of the sliding ring 300 slipping. Compared with the spring guide rail in the prior art, which is used as the guide rail of the sliding ring 300 and is movably arranged on the nut 100. The scheme eliminates the separate spring guide rail and directly fixes the threaded guide rail 200 on the nut 100. On the one hand, the spring guide rail is reduced, so that the cost can be reduced, the assembly process of the threaded guide rail 200 is simplified, and the management cost is also reduced; on the other hand, the deviation of the stop position caused by the deviation of the spring guide rail after limiting in the prior art can be improved, so as to affect the flow control accuracy and cause the stop failure caused by large vibration.

[0044] Please continue to refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 to understand more structural details of the stop mechanism 10. The nut 100 is processed with internal threads matched with external threads of the screw rod, and one end of the sliding ring 300 extends outward to form a sliding ring extension part 310 in contact with the side surface of the stop rod 400 for limiting.

[0045] In an optional embodiment, the threaded guide rail 200 is integrally formed with the nut 100. The integrally formed arrangement can further simplify the arrangement of the nut 100 part, thereby facilitating the assembly and maintenance work.

[0046] In an optional embodiment, the upper stop portion 210 and the lower stop portion 220 are integrally formed with the nut 100. In this way, the threaded guide rail 200, the upper stop portion 210, and the lower stop portion 220 can be integrated with the nut 100, thereby greatly improving the assembly efficiency and improving the stability of the threaded guide rail 200 and the stop position.

[0047] In an optional embodiment, the upper stop portion 210 and the lower stop portion 220 are limit protrusions arranged in the guide rail groove 201 of the threaded guide rail 200; along the extension direction of the threaded guide rail 200, the limit protrusion closes the guide rail groove 201, and the outer wall of the limit protrusion is flush with the outer wall of the threaded guide rail 200. In this way, the upper stop portion 210 and the lower stop portion 220 cooperate more closely with the threaded guide rail 200, and the accuracy of the stop position can also be guaranteed.

[0048] From Figure 3 and Figure 4 It can also be seen that, in an optional embodiment, a first notch portion 510 and a second notch portion 520 are further included, the first notch portion 510 and the second notch portion 520 both extend along the height direction of the nut 100; along the radial direction of the nut 100, the first notch portion 510 and the second notch portion 520 both extend towards the central axis direction of the nut 100. In this way, the first notch portion 510 and the second notch portion 520 mainly serve the process manufacturing requirements and cost reduction of the nut 100.

[0049] In an optional embodiment, along the radial direction of the nut 100, the first notch portion 510 and the second notch portion 520 are arranged on both sides of the central axis of the nut 100. It should be noted that the positive and negative assembly of the slip ring 300 meets the use requirements, and the first notch portion 510 and the second notch portion 520 do not affect the positive and negative assembly of the slip ring 300.

[0050] In an optional embodiment, the first notch portion 510 and the second notch portion 520 are both notch planes 530 formed on the outer wall of the nut 100, the notch plane 530 extends along the central axis direction of the nut 100; the distance between the notch plane 530 and the central axis of the nut 100 is less than the radius of the nut 100.

[0051] In an optional embodiment, the stop mechanism 10 further includes a mounting portion 600, the mounting portion 600 is arranged at the top of the threaded guide rail 200; and along the extension direction of the threaded guide rail 200, the mounting portion 600 is located at one end of the upper stop portion 210 close to the lower stop portion 220. An inclined angle 610 is arranged on the mounting portion 600.

[0052] Because the spiral sliding ring 300 is made of metal material, it has a certain elastic stretching amount in the stretching direction. In use, the sliding ring 300 is supported by the inclined angle 610 of the mounting portion 600 of the nut 100 guide rail, and when the sliding ring 300 is completely inserted into the nut 100 guide rail, the sliding ring 300 is restored to the original state by the spring force, so that the sliding ring 300 is matched in the nut 100 guide rail and cannot slide out, and the assembly is one-way, and can only enter the nut 100 guide rail, and when it is rotated in the opposite direction, the limiting protrusion will block the rotation of the sliding ring 300, thereby playing a limiting effect.

[0053] As shown in Figure 5 Further, in the optional embodiment, the spiral sliding ring 300 further comprises a bending portion 320, the bending portion 320 is located at the end of the sliding ring 300 away from the sliding ring extending portion 310, and the bending portion 320 extends towards the direction away from the center of the sliding ring 300. The bending portion 320 can ensure that the end of the sliding ring 300 away from the sliding ring extending portion 310 can smoothly slide from the mounting portion 600 into the threaded guide rail 200. Optionally, the bending portion 320 and the sliding ring extending portion 310 are located on the same straight line in the radial direction of the sliding ring 300.

[0054] In a second aspect, the utility model improves an electronic expansion valve, the electronic expansion valve includes the stop mechanism 10 of any preceding embodiment.

[0055] In summary, the utility model improves a stop mechanism 10 and an electronic expansion valve, at least has following advantages:

[0056] The threaded guide rail 200, the upper stop portion 210, the lower stop portion 220 and the nut 100 of the stop mechanism 10 of the present scheme can be integrated, thereby greatly improving the assembly efficiency, and improving the stability of the threaded guide rail 200 and the stop position, thereby improving the technical problems of the risk of sliding of the sliding ring 300, poor stop effect, high cost and management cost in the prior art.

[0057] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A stop mechanism, characterized by Comprising: a nut (100), a threaded guide rail (200), a sliding ring (300), a sliding ring extension (310), a stop rod (400); the threaded guide rail (200) is spirally fixed on the nut (100) along the height direction of the nut (100); the sliding ring (300) is movably arranged in the guide rail sliding groove (201) of the threaded guide rail (200) along the extension direction of the threaded guide rail (200); the top of the threaded guide rail (200) is provided with an upper stop portion (210), and the bottom of the threaded guide rail (200) is provided with a lower stop portion (220); the sliding ring (300) has a sliding ring extension (310) extending away from the nut (100); the top of the stop rod (400) can be connected with a magnet, and the bottom of the stop rod (400) can abut against the sliding ring extension (310); the stop rod (400) is configured to be able to rotate with the magnet, and the sliding ring extension (310) drives the sliding ring (300) to slide up and down between the upper stop portion (210) and the lower stop portion (220).

2. The stop mechanism according to claim 1, wherein: the threaded guide rail (200) is integrally formed with the nut (100).

3. The stop mechanism according to claim 1, wherein: the upper stop portion (210) and the lower stop portion (220) are integrally formed with the nut (100).

4. The stop mechanism according to claim 1, wherein: the upper stop portion (210) and the lower stop portion (220) are limiting protrusions arranged in the guide rail sliding groove (201) of the threaded guide rail (200); along the extension direction of the threaded guide rail (200), the limiting protrusions close the guide rail sliding groove (201), and the outer wall of the limiting protrusions is flush with the outer wall of the threaded guide rail (200).

5. The stop mechanism according to claim 1, further comprising a first notch portion (510) and a second notch portion (520), wherein: the first notch portion (510) and the second notch portion (520) both extend along the height direction of the nut (100); and along the radial direction of the nut (100), the first notch portion (510) and the second notch portion (520) both extend towards the central axis direction of the nut (100).

6. The stop mechanism according to claim 5, wherein: along the radial direction of the nut (100), the first notch portion (510) and the second notch portion (520) are arranged on both sides of the central axis of the nut (100).

7. The stop mechanism according to claim 6, wherein: The first notch part (510) and the second notch part (520) are both notch planes (530) formed on the outer wall of the nut (100), the notch planes (530) extend along the central axis of the nut (100); the distance between the notch planes (530) and the central axis of the nut (100) is less than the radius of the nut (100).

8. The stop mechanism of claim 1, wherein: Further comprising a mounting part (600), the mounting part (600) is arranged on the top of the threaded guide rail (200); and along the extension direction of the threaded guide rail (200), the mounting part (600) is located at one end of the upper stop part (210) close to the lower stop part (220).

9. The stop mechanism of claim 8, wherein: The spiral-shaped sliding ring (300) further comprises a bending part (320), the bending part (320) is located at the end of the sliding ring (300) away from the sliding ring extending part (310); and the bending part (320) extends towards the direction away from the center of the sliding ring (300).

10. An electronic expansion valve, comprising: The electronic expansion valve comprises the stop mechanism of any one of claims 1-9.

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