Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve which comprises a magnetic rotor, a stop rod, a nut, a spring guide rail and a lead screw, the stop rod is fixed to the magnetic rotor, the stop rod comprises a body part and a protruding part, the spring guide rail comprises an upper limiting part, a spiral body and a lower limiting part, the spiral body of the spring guide rail is arranged on a nut shaft in a sleeving mode, and the lower limiting part is arranged on the nut shaft in a sleeving mode. According to the stop mechanism, a sliding ring in a traditional electronic expansion valve is removed, the cost is reduced, the installation difficulty is reduced, and the structure of the electronic expansion valve is more simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to an electronic expansion valve. Background Art

[0002] The electronic expansion valve can respond quickly to dynamic changes in air-conditioning refrigerant under driving conditions and can be used in a variety of control strategies to improve the efficiency and performance of the overall air-conditioning system.

[0003] The stop mechanism of a traditional electronic expansion valve is composed of a stop rod, a slip ring, a nut, etc.

[0004] The specific movement process is that the internal coil is energized to generate a magnetic field, the magnet rotates, and the magnet drives the magnet connecting plate, the stop rod, and the slip ring to move together. The slip ring is installed on the spring guide rail, and the slip ring rotates on the spring guide rail. The upper end of the spring guide rail has an upper limit portion. When the slip ring moves to the upper end of the spring guide rail, the upper limit portion of the spring guide rail prevents the slip ring from continuing to move, and the slip ring stops moving. The stop rod is clamped with the magnet connecting plate. After the slip ring stops moving, the protrusion on the slip ring continues to prevent the stop rod from moving.

[0005] This type of electronic expansion valve has many parts and a relatively complex structure. Summary of the invention

[0006] The present invention aims to provide an electronic expansion valve which does not require installation of a slip ring and has a more streamlined structure.

[0007] An electronic expansion valve comprises a magnetic rotor, a stop rod, a nut, a spring guide rail, and a screw rod, wherein the stop rod is fixed or integrated with the magnetic rotor, the stop rod comprises a main body and a protruding portion, the protruding portion protrudes relative to the main body in the radial direction of the magnetic rotor, the spring guide rail is sleeved on the nut and the spring guide rail is fixed or limited with the nut, the spring guide rail comprises an upper limit portion, a spiral main body portion, and a lower limit portion, the upper limit portion and the lower limit portion are arranged on both sides of the axial direction of the spiral main body portion, and the upper limit portion is relative to the spiral main body portion in The magnetic rotor protrudes in the radial direction, and the lower limit portion protrudes in the radial direction of the magnetic rotor relative to the spiral main body. In the radial direction of the magnetic rotor, the protrusion can have an overlapping portion with the upper limit portion, the protrusion can have an overlapping portion with the lower limit portion, and a certain distance is left between the protrusion and the spiral main body. The stop rod has an upper limit position and a lower limit position. In the upper limit position, the protrusion can be against the upper limit portion, and in the lower limit position, the protrusion can be against the lower limit portion.

[0008] The above technical scheme has the following technical effects: a magnetic field is generated when the electronic expansion valve is energized, and the magnetic rotor drives the stop rod to rotate together, and the stop rod rotates around the nut. As the stop rod rotates, the protruding part of the stop rod is blocked by the upper limit part and the lower limit part of the spring nut and stops moving. In this way, the movement of the stop rod is prevented by the limitation of the stop rod and the upper limit part and the lower limit part of the spring nut, thereby realizing the upper and lower limit of the stop rod.

[0009] This type of electronic expansion valve has fewer parts and a more streamlined structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The features and advantages of one or more embodiments of the present invention will become more easily understood through the following description with reference to the accompanying drawings, in which:

[0011] Figure 1 is a cross-sectional schematic diagram of a partial structure of an embodiment of the present invention;

[0012] Figure 2 is a schematic diagram of a stop rod implementation method 1;

[0013] Figure 3 is a schematic diagram of spring nut implementation mode 1;

[0014] Figure 4 is a schematic diagram of a stop rod implementation method 2;

[0015] Figure 5 is a schematic diagram of a first embodiment of a stop rod implementation method 3;

[0016] Figure 6 is a front view of a stop rod implementation method 3;

[0017] Figure 7 is a partial enlarged view of the implementation mode 3 of the stop rod;

[0018] Figure 8 is another partial enlarged view of the embodiment 3 of the stop rod;

[0019] Fig. 9 is a schematic diagram of a second embodiment of stop rod implementation method 3;

[0020] Fig.10 It is a schematic diagram of the screw rod positive thread;

[0021] Fig.11 is a schematic diagram of spring nut implementation mode 2;

[0022] Fig.12 is a schematic diagram of a third embodiment of the stop rod implementation method 3;

[0023] Fig.13 This is a schematic diagram of the reverse thread of the screw rod;

[0024] Fig.14 is a schematic diagram of spring nut implementation method 3;

[0025] Reference numerals:

[0026] 1: magnetic rotor; 2: stop rod; 2a: main body; 2m: protrusion; 2b: radial protrusion; 2c: axial protrusion; 6: upper groove; 7: lower groove; 2d: first upper groove; 2I: second upper groove; 2J: first lower groove; 2e: second lower groove; 2f: arc portion; 2g: upper wall; 2h: lower wall; 3: nut; 4: spring guide; 4a: upper limit portion; 4b: spiral main body; 4c: lower limit portion; 4d: first bending portion; 8: first extension portion; 9: second extension portion; 4e: second bending portion; 4f: extension portion; 5: screw rod;

[0027] D1: axial distance between the upper limit part and the lower limit part;

[0028] D2: axial distance between the top wall and the bottom wall of the protrusion 2m;

[0029] D3: axial distance between the top wall and the bottom wall of the axial protrusion 2c;

[0030] D4: axial distance between the upper edge line of the upper wall 2g and the lower edge line of the lower wall 2h;

[0031] S: screw pitch; DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention.

[0033] like Figure 1 As shown, Figure 1 An electronic expansion valve includes a magnetic rotor 1, a stop rod 2, a nut 3, a spring guide rail 4, and a screw rod 5.

[0034] Combined with reference Figure 2 and Figure 3The stop rod 2 is fixed or integrated with the magnetic rotor 1, and the stop rod 2 includes a main body 2a and a protruding portion 2m, and the protruding portion 2m protrudes relative to the main body 2a in the radial direction of the magnetic rotor 1. The spring guide 4 is sleeved on the nut 3, and the spring guide 4 is fixed or limited with the nut 3. The spring guide 4 includes an upper limit portion 4a, a spiral main body 4b, and a lower limit portion 4c. The upper limit portion 4a and the lower limit portion 4c are respectively arranged on both sides of the axial direction of the spiral main body 4b, and the upper limit portion 4a is relative to the spiral main body 4b in the radial direction of the magnetic rotor 1. The lower limit portion 4c protrudes in the radial direction of the magnetic rotor 1 relative to the spiral main body portion 4b, and in the radial direction of the magnetic rotor 1, the protrusion 2m has an overlapping portion with the upper limit portion 4a, the protrusion 2m has an overlapping portion with the lower limit portion 4c, and a certain distance is left between the protrusion 2m and the spiral main body portion 4b, and the stop rod 2 has an upper limit position and a lower limit position. At the upper limit position, the protrusion 2m can be abutted against the upper limit portion 4a, and at the lower limit position, the protrusion 2m can be abutted against the lower limit portion 4c.

[0035] The main body portion 2a is a portion of the stopper rod 2 between the top wall of the stopper rod 2 and the top wall of the protrusion 2m in the axial direction.

[0036] The stop rod 2 rotates one circle and moves 1 times the pitch of the screw 5 in the axial direction. The axial distance D1 between the upper limit portion 4a and the lower limit portion 4c is equal to the sum of the axial distance D2 between the top wall and the bottom wall of the protrusion 2m and the product of the maximum number of circles N of the magnetic rotor 1 multiplied by the pitch S of the screw 5. The above is to ensure that the protrusion 2m can move unobstructed between the upper limit portion 4a and the lower limit portion 4c without hitting the upper limit portion 4a and the lower limit portion 4c, and at the same time, it can ensure that the bottom of the protrusion 2m can be limited by the lower limit portion 4c or the top of the protrusion 2m can be limited by the upper limit portion 4a, so that the stop rod 2 stops moving.

[0037] In addition, if Figure 3 As shown, the bottom of the spring guide rail 4 has a protruding portion 4f, and the protruding portion 4f is clamped and fixed with the bottom of the nut 3. The positions of the upper limit portion 4a and the lower limit portion 4c in the radial direction always remain unchanged, which is convenient for limiting with the stop rod 2 to prevent the movement of the stop rod 2.

[0038] After the electronic expansion valve is powered on, a magnetic field is generated. The magnetic rotor 1 drives the stop rod 2 and the screw rod 5 to rotate together. The screw rod 5 can move relative to the nut 3 in the axial direction of the electronic expansion valve, and the screw rod can drive the valve core of the electronic expansion valve to move to open or close the valve. The stop rod 2 rotates around the nut 3. As the stop rod 2 rotates, the protrusion 2m of the stop rod 2 is blocked by the upper limit part 4a and the lower limit part 4c and stops moving. In this way, through the limit of the stop rod 2 and the upper limit part 4a and the lower limit part 4c, the magnetic rotor 1 drives the screw rod 5 to move up and down during the rotation process, thereby realizing the upper and lower limit of opening and closing the valve. The electronic expansion valve realizes the upper and lower limit of the screw rod through the magnetic rotor, the stop rod, the screw rod, etc., so that the opening and closing of the electronic expansion valve have mechanical limit points. This electronic expansion valve has relatively few parts and a relatively simple structure.

[0039] More specifically, during the rotation of the magnetic rotor 1, the protrusion 2m moves upward or downward unimpeded between the upper limit portion 4a and the lower limit portion 4c. When the stop rod 2 moves downward in the axial direction, the protrusion 2m is limited by the lower limit portion 4c and stops moving. The magnetic rotor 1 can only exit the limited state by reversing. Therefore, the stop rod 2 reverses and moves upward in the axial direction, and the protrusion 2m is limited by the upper limit portion 4a and stops moving.

[0040] Reference Figure 4 As a second embodiment, the stopper rod 2 includes a main body 2a and a protrusion 2m. The protrusion 2m protrudes relative to the main body 2a in the radial direction of the magnetic rotor 1. The protrusion 2m includes a radial protrusion 2b and an axial protrusion 2c. The radial protrusion 2b and the axial protrusion 2c have the same thickness for easy processing and are integrally formed. One end of the radial protrusion 2b is integrally connected to the main body 2a, and the other end of the radial protrusion 2b is integrally connected to the axial protrusion 2c.

[0041] In the upper limit position, the axial protrusion 2c can abut against the upper limit portion 4a, and in the lower limit position, the axial protrusion 2c can abut against the lower limit portion 4c.

[0042] The axial distance D1 between the upper limit portion 4a and the lower limit portion 4c is equal to the sum of the axial distance D3 between the top wall and the bottom wall of the axial protrusion 2c and the product of the maximum number of revolutions N of the magnetic rotor 1 and the pitch S of the screw 5.

[0043] In one embodiment, the bottom wall of the radial protrusion 2b is coplanar with the bottom wall of the axial protrusion 2c. Figure 2In this embodiment, when the upper limit portion 4a and the lower limit portion 4c are at the limiting position, the ends of the upper limit portion 4a and the lower limit portion 4c are at a certain distance from the main body 2a in the radial direction, so as to ensure that the upper limit portion 4a and the lower limit portion 4c can be limited by the axial protrusion 2c, thereby preventing the main body 2a from being limited by the upper limit portion 4a and the lower limit portion 4c during the movement of the stop rod 2, thereby stopping the movement of the stop rod 2.

[0044] In another embodiment, one end of the radial protrusion 2b is connected to the portion between the top wall and the bottom wall of the axial protrusion 2c. In this embodiment, when the upper limit portion 4a is in the limiting position, the end of the upper limit portion 4a has a certain distance from the main body 2a in the radial direction, ensuring that the upper limit portion 4a can be limited by the axial protrusion 2c, preventing the main body 2a from being limited by the upper limit portion 4a during the movement of the stop rod 2, thereby stopping the movement of the stop rod 2. This embodiment can also reduce material waste.

[0045] like Figure 4 As shown in FIG. 1 , which is one embodiment of the stop rod 2, the top wall of the radial protrusion 2b is coplanar with the top wall of the axial protrusion 2c. Figure 2 (as shown) reduces material waste, facilitates processing, and makes positioning more convenient.

[0046] Reference Figure 5 As a third embodiment, the top end of the protrusion 2m is provided with an upper groove 6, and the bottom end is provided with a lower groove 7. The upper groove 6 and the lower groove 7 have opening directions opposite to each other and are arranged on two opposite sides of the protrusion 2m.

[0047] like Figure 5 As shown, in the first example of the third embodiment, in order to make the protrusion 2m and the upper limit portion 4a and the lower limit portion 4c more securely limited, the upper groove 6 in this embodiment includes a first upper groove 2d and a second upper groove 2I; a lower groove 7 is provided at the bottom end, and the lower groove 7 includes a first lower groove 2J and a second lower groove 2e, and the opening directions of the first upper groove 2d and the second lower groove 2e are opposite; the opening directions of the first lower groove 2J and the second upper groove 2I are opposite.

[0048] Herein, the top end refers to a distance close to the top wall, and the bottom end refers to a distance close to the bottom wall, and is not limited to the positions of the top wall and the bottom wall.

[0049] Specifically, Figure 6As shown, it is the main view of the first embodiment of the stop rod 2, and the direction in which the protrusion 2m protrudes relative to the main body 2a is the main view direction of the stop rod 2. In the main view, the main body 2a is above the protrusion 2m, the first upper groove 2d opens to the left, and the second upper groove 2I opens to the right; the first lower groove 2J opens to the right, and the second lower groove 2e opens to the left.

[0050] The lower groove 7 has a corresponding lower edge wall 2h, such as Figure 7 As shown, it is a partial enlarged view of the upper edge wall 2g, and the upper groove 6 has a corresponding upper edge wall 2g.

[0051] The axial distance D1 between the upper limit portion 4a and the lower limit portion 4c is equal to the sum of the axial distance D4 between the upper edge line of the upper wall 2g and the lower edge line of the lower wall 2h and the product of the maximum number of revolutions N of the magnetic rotor 1 and the pitch S of the screw 5. It can be ensured that during the upward movement of the stop rod 2, the first upper groove 2d or the second upper groove 2e can be blocked by the upper limit portion 4a and stop moving; during the downward movement of the stop rod 2, the first lower groove 2j or the second lower groove 2e can be blocked by the lower limit portion 4c and stop moving.

[0052] The upper groove 6 and the lower groove 7 penetrate the protruding portion 2m in the protruding direction of the protruding portion 2m relative to the main body portion 2a, so as to achieve a better limiting effect.

[0053] In the limiting position of the first upper groove 2d or the second upper groove 2e and the upper limit portion 4a, the upper limit portion 4a abuts against the inner wall of the first upper groove 2d or the inner wall of the second upper groove 2e, and the end of the upper limit portion 4a passes through the first upper groove 2d or the second upper groove 2e; in the limiting position of the first lower groove 2J, the second lower groove 2e and the lower limiting portion 4c, the lower limiting portion 4c abuts against the inner wall of the first lower groove 2J or the inner wall of the second lower groove 2e, and the end of the lower limiting portion 4c passes through the first lower groove 2J or the second lower groove 2e, so that the protrusion 2m can be better limited when limiting the upper and lower positions.

[0054] In addition, the stop rod 2 rotates one circle and moves 1 times the pitch in the axial direction. The distance between the upper edge line of the upper edge wall 2g and the top wall of the protrusion 2m is less than 1 times the pitch, to ensure that after the top wall of the protrusion 2m misses the upper limit positioning portion 4a, the first upper groove 2d or the second upper groove 2e can still be limited by the upper limit positioning portion 4a after the protrusion 2 rotates one more circle.

[0055] like Figure 8As shown, it is a partial enlarged view of the lower groove 7. The lower edge wall 2h of the lower groove 7 and the bottom wall of the protruding portion 2m have an arc portion 2f, and the arc portion 2f guides the upper limit portion 4a and the lower limit portion 4c to enter the lower groove 7.

[0056] Specifically, during the rotation of the magnetic rotor 1, the portion between the upper edge wall 2g and the lower edge wall 2J moves upward or downward unimpeded between the upper limit portion 4a and the lower limit portion 4c. When the stop rod 2 moves downward in the axial direction, the first lower groove 2J or the second lower groove 2e may be blocked by the lower limit portion 4c and stop moving. At this time, the magnetic rotor can only exit the limited state by reversing. Therefore, the stop rod 2 reverses and moves upward in the axial direction. The first upper groove 2d or the second upper groove 2e may be blocked by the upper limit portion 4a and stop moving.

[0057] like Fig. 9 As shown, it is a second example of the second embodiment of the stop rod 2, the direction in which the protrusion 2m protrudes relative to the main body 2a is the main view direction of the stop rod 2, in the main view, the main body 2a is above the protrusion 2m, the upper groove 6 opens to the left, and the lower groove 7 opens to the right.

[0058] like Fig.10 As shown, when the screw rod 5 is a positive thread, when the stop rod 2 is viewed from above as rotating clockwise, the stop rod 2 moves downward in the axial direction, and when the stop rod 2 is in the limit position, the lower limit portion 4c abuts against the inner wall corresponding to the lower groove 7; when the stop rod 2 is viewed from above as rotating counterclockwise, the stop rod 2 moves upward in the axial direction, and when the stop rod 2 is in the limit position, the upper limit portion 4a abuts against the inner wall corresponding to the upper groove 6.

[0059] In addition, if Fig.11 As shown, it is a second embodiment of the spring guide rail 4, the upper limit portion 4a has a first extension portion 8 and a first bend portion 4d, the first bend portion 4d is located at the end of the upper limit portion 4a, the lower limit portion 4c has a second extension portion 9 and a second bend portion 4e, the second bend portion 4e is located at the end of the lower limit portion 4c, and the bending directions of the first bend portion 4d and the second bend portion 4e are opposite; in the upper limit position, the first extension portion 8 and the first bend portion 4d abut against different sides of the protrusion 2m; in the lower limit position, the second extension portion 9 and the second bend portion 4e abut against different sides of the protrusion 2m. It should be noted that in this figure, the first bend portion 4d is inward along the paper surface, and the second bend portion 4e is outward along the paper surface.

[0060] In the upper limit position, the first extension portion 8 abuts against the inner wall corresponding to the upper groove 6, and the first bent portion 8 abuts against the adjacent side of the protruding portion 2m where the upper groove 6 is provided;

[0061] In the lower limit position, the second extension portion 9 abuts against the inner wall corresponding to the lower groove 7, and the second bent portion 9 abuts against the adjacent side of the protruding portion 2m where the lower groove 7 is provided.

[0062] At this time, the first bending portion 4d and the second bending portion 4e can effectively prevent the protruding portion 2m from escaping from the upper limit portion 4a and the lower limit portion 4c due to inertia force.

[0063] like Fig.12 As shown, it is the third embodiment of the second embodiment of the stop rod 2, the direction in which the protrusion 2m protrudes relative to the main body 2a is the main view direction of the stop rod 2, in the main view, the main body 2a is above the protrusion 2m, the upper groove 6 opens to the right, and the lower groove 7 opens to the left.

[0064] like Fig.13 As shown, when the screw rod is reverse-threaded, when the stop rod 2 is viewed from above as rotating clockwise, the stop rod 2 moves upward in the axial direction, and when the stop rod 2 is in the limit position, the upper limit portion 4a abuts against the inner wall corresponding to the upper groove 6; when the stop rod 2 is viewed from above as rotating counterclockwise, the stop rod 2 moves downward in the axial direction, and when the stop rod 2 is in the limit position, the lower limit portion 4c abuts against the inner wall corresponding to the lower groove 7.

[0065] In addition, if Fig.14 As shown in FIG. 3 , a third embodiment of the spring guide rail 4 is shown. It should be noted that, in this figure, the first bent portion 4d is outward along the paper surface, and the second bent portion 4e is inward along the paper surface.

[0066] Specifically, when the screw rod is a positive thread, the direction in which the protrusion 2m protrudes relative to the main body 2a is the main view direction of the stop rod 2. In the main view, the main body 2a is above the protrusion 2m. At this time, the upper groove 6 opens to the left and the lower groove 7 opens to the right. The spring guide rail 4 may include a first bending portion 4d and a second bending portion 4e. The first bending portion 4a faces inward on paper, and the second bending portion faces outward on paper.

[0067] When the screw rod is reverse threaded, the upper groove 6 opens to the right, and the lower groove 7 opens to the left; the first bending portion 4a faces outward, and the second bending portion 4c faces inward.

[0068] It should be noted that the above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention, such as the directional definitions of "front", "back", "left", "right", "up" and "down". Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be combined, modified or replaced by each other, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electronic expansion valve, characterized in that: The invention comprises a magnetic rotor (1), a stop rod (2), a nut (3), a spring guide rail (4), and a screw rod (5), wherein the stop rod (2) is fixed to or integrated with the magnetic rotor (1), the stop rod (2) comprises a main body (2a) and a protruding portion (2m), the protruding portion (2m) protrudes relative to the main body (2a) in the radial direction of the magnetic rotor (1), the spring guide rail (4) is sleeved on the nut (3), and the spring guide rail (4) is fixed to or limited by the nut (3), the spring guide rail (4) comprises an upper limit portion (4a), a spiral main body portion (4b), and a lower limit portion (4c), the upper limit portion (4a) and the lower limit portion (4c) are respectively arranged on both sides of the axial direction of the spiral main body portion (4b), and the upper limit portion (4a) is relatively The spiral main body (4b) protrudes in the radial direction of the magnetic rotor (1), and the lower limit portion (4c) protrudes in the radial direction of the magnetic rotor (1) relative to the spiral main body (4b). In the radial direction of the magnetic rotor (1), the protruding portion (2m) can overlap with the upper limit portion (4a), and the protruding portion (2m) can overlap with the lower limit portion (4c), and a certain distance is left between the protruding portion (2m) and the spiral main body (4b). The stop rod (2) has an upper limit position and a lower limit position. In the upper limit position, the protruding portion (2m) can abut against the upper limit portion (4a), and in the lower limit position, the protruding portion (2m) can abut against the lower limit portion (4c).

2. The electronic expansion valve according to claim 1, characterized in that: The axial distance (D1) between the upper limit portion (4a) and the lower limit portion (4c) is equal to the sum of the axial distance (D2) between the top wall and the bottom wall of the protruding portion (2m) and the product of the maximum number of revolutions (N) of the magnetic rotor (1) and the pitch (S) of the screw rod (5).

3. The electronic expansion valve according to claim 1, characterized in that: The bottom of the spring guide rail (4) is provided with a protruding portion (4f), and the protruding portion (4f) is clamped and fixed to the bottom of the nut (3).

4. The electronic expansion valve according to claim 1 or 2, characterized in that: The upper limit portion (4a) comprises a first extension portion (8) and a first bending portion (4d), wherein the first bending portion (4d) is located at the end of the upper limit portion (4a), and the lower limit portion (4c) comprises a second extension portion (9) and a second bending portion (4e), wherein the second bending portion (4e) is located at the end of the lower limit portion (4c), and the bending directions of the first bending portion (4d) and the second bending portion (4e) are opposite; At the upper limit position, the first extension portion (8) and the first bent portion (4d) abut against different side portions of the protruding portion; At the lower limit position, the second extension portion (9) and the second bent portion (4e) abut against different sides of the protruding portion (2m).

5. The electronic expansion valve according to claim 1, characterized in that: The protruding portion (2m) comprises a radial protruding portion (2b) and an axial protruding portion (2c); one end of the radial protruding portion (2b) is integrally connected to the main body portion (2a); and the other end of the radial protruding portion (2b) is integrally connected to the axial protruding portion (2c); In the upper limit position, the axial protrusion (2c) can abut against the upper limit portion (4a), and in the lower limit position, the axial protrusion (2c) can abut against the lower limit portion (4c).

6. The electronic expansion valve according to claim 5, characterized in that: The axial distance (D1) between the upper limit portion (4a) and the lower limit portion (4c) is equal to the sum of the axial distance (D3) between the top wall and the bottom wall of the axial protrusion (2c) and the product of the maximum number of revolutions (N) of the magnetic rotor (1) and the pitch (S) of the screw rod (5).

7. The electronic expansion valve according to any one of claims 1 to 6, characterized in that: The top end of the protruding portion (2m) is provided with an upper groove (6), and the bottom end is provided with a lower groove (7); the opening directions of the upper groove (6) and the lower groove (7) are opposite; the upper groove (6) and the lower groove (7) are arranged on two opposite sides of the protruding portion (2m).

8. The electronic expansion valve according to claim 7, characterized in that: The upper groove (6) and the lower groove (7) penetrate the protruding portion (2m) in the protruding direction of the protruding portion (2m) relative to the main body portion (2a).

9. The electronic expansion valve according to claim 8, characterized in that: The upper groove (6) has a corresponding upper wall (2g), the lower groove (7) has a corresponding lower wall (2h), and the axial distance (D1) between the upper limit portion (4a) and the lower limit portion (4c) is equal to the sum of the axial distance (D4) between the upper line of the upper wall (2g) and the lower line of the lower wall (2h) and the product of the maximum number of revolutions (N) of the magnetic rotor (1) and the pitch (S) of the screw rod (5).

10. The electronic expansion valve according to claim 8 or 9, characterized in that: The upper limit portion (4a) comprises a first extension portion (8) and a first bending portion (4d), wherein the first bending portion (4d) is located at the end of the upper limit portion (4a), and the lower limit portion (4c) comprises a second extension portion (9) and a second bending portion (4e), wherein the second bending portion (4e) is located at the end of the lower limit portion (4c), and the bending directions of the first bending portion (4d) and the second bending portion (4e) are opposite; At the upper limit position, the first extension portion (8) abuts against the inner wall corresponding to the upper groove (6), and the first bent portion (4d) abuts against the adjacent side of the protruding portion (2m) where the upper groove (6) is provided; At the lower limit position, the second extension portion (9) abuts against the inner wall corresponding to the lower groove (7), and the second bent portion (4e) abuts against the adjacent side of the protruding portion (2m) provided with the lower groove (7).

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