Rotor assembly of electronic expansion valve

Abstract

The utility model relates to a rotor assembly of an electronic expansion valve, and the rotor assembly comprises a magnetic rotor which is of a hollow structure, and the inner wall of the magnetic rotor is provided with a plurality of first buckles distributed around the central axis of the magnetic rotor; the guide rail is arranged in the center of the magnetic rotor, one end of the guide rail is provided with a circular truncated cone extending in the radial direction, the circular truncated cone is provided with opening grooves in the circumferential direction, the number of the opening grooves is the same as that of the first buckles, and second buckles matched with the first buckles are arranged in the opening grooves; when the guide rail is installed in the magnetic rotor in the axial direction, the first buckle makes contact with the second buckle, and after the second buckle generates elastic deformation, the second buckle can be buckled on the first buckle. According to the utility model, the design structure is reasonable, the structure is stable, the assembly of the magnetic rotor and the guide rail is realized by adopting a buckle connection mode, a traditional embedded structure is replaced, the phenomenon that the magnetic rotor is cracked in the traditional embedding process can be solved, and the damage of the magnetic rotor is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of electronic expansion valve structure design, and in particular to a rotor assembly of an electronic expansion valve. Background Art

[0002] Electronic expansion valves have been widely used in throttling expansion and flow regulation of fluids. They use an energized coil to drive the magnetic rotor to rotate, and convert the rotation of the magnetic rotor into the up and down movement of the screw rod. The screw rod then drives the valve needle fixed to it to rise and fall to control the size of the valve port channel (opening) to control the flow rate.

[0003] At present, the structure of the electronic expansion valve in the prior art is as follows Figure 9-11 As shown, the outer periphery of the magnetic rotor 1 is a sleeve-like structure, with a connecting base 8 embedded within. The magnetic rotor 1 is formed from a composite of engineering plastic and magnetic powder, while the connecting base 8 is made of metal. Due to the different shrinkage rates of the two materials, the magnetic rotor 1 can easily crack during insertion, particularly in the area surrounding the connecting base 8. Furthermore, when the center rod 9 is subsequently assembled with the connecting base 8, the press-fitting process generates expansion forces on the connecting base 8 due to the interference fit or tight fit between the center rod 9 and the connecting base 8. This can damage the magnetic rotor 1, leading to a high failure rate and a shortened service life of the electronic expansion valve. Utility Model Content

[0004] In order to solve the problem of cracking and damage of the magnetic rotor caused by internal structural design defects of the existing electronic expansion valve mentioned in the background art, the present application provides a rotor assembly of an electronic expansion valve.

[0005] The rotor assembly of an electronic expansion valve provided in this application adopts the following technical solution:

[0006] A rotor assembly of an electronic expansion valve, comprising:

[0007] The magnetic rotor has a hollow structure inside and a plurality of first buckles distributed around its central axis on the inner wall;

[0008] The guide rail is arranged at the center of the magnetic rotor, and has a circular cone extending in the radial direction at one end. The circular cone is provided with an opening groove in the circumferential direction, the number of which is the same as the number of the first buckles. The interior of the opening groove is provided with a second buckle that cooperates with the first buckle;

[0009] When the guide rail is axially installed into the magnetic rotor, the first buckle contacts the second buckle, and after the second buckle is elastically deformed, the second buckle can be buckled onto the first buckle.

[0010] By adopting the above technical solution, the magnetic rotor and the guide rail are connected by a snap connection method, which can realize the connection between the magnetic rotor and the guide rail, replacing the inlay structure in the prior art, avoiding the problem of cracking and damage of the magnetic rotor during the connection between the magnetic rotor and the guide rail, and has the advantages of simple and firm assembly structure.

[0011] Optionally, the magnetic rotor further includes:

[0012] Rotation limiting plates are arranged on the inner wall of the magnetic rotor and extend toward the center of the magnetic rotor, and are arranged in pairs on both sides of the first buckle;

[0013] After the first buckle and the second buckle are buckled with each other, the first buckle and the second buckle are both located in the space between the two rotation limiting plates, and the rotation limiting plates are placed in the open grooves of the truncated table.

[0014] By adopting the above technical solution, the cooperation between the rotation limit plate and the open slot can prevent the problem of relative rotation between the magnetic rotor and the guide rail, thereby achieving synchronous rotation of the magnetic rotor and the guide rail when the electronic expansion valve is in use.

[0015] Optionally, the number of the first buckles, the opening slots, and the second buckles are two each, and they are evenly distributed around the center line of the magnetic rotor.

[0016] By adopting the above technical solution, the magnetic rotor can have a stable structure after being connected to the guide rail.

[0017] Optionally, the end edge of the boss has an outwardly extending axial limit plate. When the first clip and the second clip are engaged, the inner end of the axial limit plate abuts against the end position of the magnetic rotor, thereby preventing the magnetic rotor and the guide rail from moving relative to each other in the axial direction.

[0018] By adopting the above technical solution, the axial direction of the magnetic rotor and the guide rail is limited after the first clip and the second clip are fastened together, thereby avoiding the problem of relative movement of the magnetic rotor and the guide rail in the axial direction.

[0019] Optionally, a side of the first clip close to the proximal port of the magnetic rotor is a first inclined surface, and the vertical distance from the first inclined surface to the proximal port of the magnetic rotor gradually increases from the outside to the inside; a side of the first clip away from the proximal port of the magnetic rotor is a first plane, and the first plane is perpendicular to the center line of the magnetic rotor.

[0020] By adopting the above technical solution, the first buckle and the second buckle can be quickly assembled, the assembly efficiency is improved, and the problem of the two being easily separated is prevented.

[0021] Optionally, a side of the second clip close to the proximal port of the magnetic rotor is a second plane, which is perpendicular to the center line of the guide rail; a side of the second clip away from the proximal port of the magnetic rotor is a second inclined surface, and the vertical distance from the second inclined surface to the proximal port of the magnetic rotor gradually increases from the outside to the inside.

[0022] By adopting the above technical solution, the first buckle and the second buckle can be quickly assembled, the assembly efficiency is improved, and the problem of the two being easily separated is prevented.

[0023] Optionally, the rotor assembly further includes:

[0024] A screw sleeve is coaxially connected to the end of the guide rail, and one end of the screw sleeve extends toward the outer end of the magnetic rotor;

[0025] A screw rod, one end of which is inserted into the screw rod sleeve and fixedly connected to the screw rod sleeve;

[0026] The valve needle is coaxially and movably arranged in the central hole of the screw rod, and the end portion is connected to a support seat. A spring is provided between the support seat and the step root of the inner hole of the guide rail.

[0027] By adopting the above technical solution, the integral center rod in the prior art is realized by connecting the screw sleeve and the screw, so that the screw and the screw sleeve are tightly fitted outside the magnetic rotor, avoiding the problem of swelling of the lower end of the guide rail.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] The utility model has a reasonable and stable design structure, adopts a snap connection method to realize the assembly of the magnetic rotor and the guide rail, replaces the traditional inlay structure, can solve the phenomenon of magnetic rotor cracking caused by the traditional inlay process, and avoids damage to the magnetic rotor.

[0030] The utility model is provided with a screw sleeve extending toward the outside of the magnetic rotor, and the screw is installed on the screw sleeve in a tight-fitting connection manner, which can avoid the expansion problem of the round table position at the lower end of the guide rail during the tight-fitting press-fitting process, avoid the phenomenon of cracking and damage to the guide rail and the magnetic rotor, and extend the service life of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the overall structural diagram of the utility model;

[0032] Figure 2 This is a cross-sectional view of the connection between the magnetic rotor, guide rail and screw sleeve of the utility model. Figure 1 ;

[0033] Figure 3 This is a cross-sectional view of the connection between the magnetic rotor, guide rail and screw sleeve of the utility model. Figure 2 ;

[0034] Figure 4 This is a three-dimensional diagram of the connection between the magnetic rotor, guide rail and screw sleeve of the utility model;

[0035] Figure 5 It is a three-dimensional diagram of the magnetic rotor of the utility model;

[0036] Figure 6 It is a cross-sectional view of the magnetic rotor of the utility model;

[0037] Figure 7 This is a three-dimensional diagram of the connection between the guide rail and the screw sleeve of the utility model;

[0038] Figure 8 This is a cross-sectional view of the connection between the guide rail and the screw sleeve of the utility model;

[0039] Figure 9 This is an assembly structure diagram of an electronic expansion valve rotor assembly in the prior art;

[0040] Figure 10 It is an exploded view of an electronic expansion valve rotor assembly in the prior art;

[0041] Figure 11 It is a partial cross-sectional view of an electronic expansion valve rotor assembly in the prior art.

[0042] Explanation of the accompanying drawings: 1. Magnetic rotor; 101. First clip; 1011. First plane; 1012. First inclined surface; 102. Rotation limit plate; 2. Guide rail; 201. Cone; 202. Second clip; 2021. Second plane; 2022. Second inclined surface; 203. Opening groove; 204. Axial limit plate; 3. Spring; 4. Support seat; 5. Screw sleeve; 6. Screw; 7. Valve needle; 8. Connecting seat; 9. Center rod. DETAILED DESCRIPTION

[0043] The present application is further described in detail below with reference to the accompanying drawings.

[0044] like Figure 1-8 As shown, the embodiment of the present application discloses a rotor assembly of an electronic expansion valve, comprising:

[0045] The magnetic rotor 1 has a hollow structure inside, and has a plurality of first buckles 101 distributed around its central axis on the inner wall. The first buckles 101 are located on the inner wall of the magnetic rotor 1 near the port.

[0046] The guide rail 2 is arranged at the center of the magnetic rotor 1 and has a radially extending circular platform 201 at one end. The circular platform 201 is provided with the same number of opening slots 203 as the first clips 101 in the circumferential direction. The interior of the opening slots 203 is provided with second clips 202 that cooperate with the first clips 101. The circular platform 201, the second clips 202 and the guide rail 2 are integrally formed.

[0047] When the guide rail 2 is axially installed into the magnetic rotor 1 , the first buckle 101 contacts the second buckle 202 , and after the second buckle 202 is elastically deformed, the second buckle 202 can be buckled onto the first buckle 101 .

[0048] Specifically, the magnetic rotor 1 further includes:

[0049] The rotation limiting plates 102 are arranged on the inner wall of the magnetic rotor 1 and extend toward the center of the magnetic rotor 1. They are arranged in pairs on both sides of the first clip 101. That is, a rotation limiting plate 102 is provided on both sides of each first clip 101. This can prevent the guide rail 2 and the magnetic rotor 1 from rotating relative to each other after the second clip 202 is engaged with the first clip 101, thereby preventing the second clip 202 from being separated from the first clip 101.

[0050] After the first buckle 101 and the second buckle 202 are buckled together, the first buckle 101 and the second buckle 202 are both located in the space between the two rotation limiting plates 102 , and the rotation limiting plates 102 are placed in the opening groove 203 of the truncated table 201 .

[0051] Specifically, in this example, the number of the first clips 101, the opening slots 203, and the second clips 202 are all two, and are evenly distributed around the center line of the magnetic rotor 1. Similarly, according to actual needs, the number of the first clips 101, the opening slots 203, and the second clips 202 can be set to three or more, in order to ensure that the magnetic rotor 1 is firmly connected to the guide rail 2 after being fastened.

[0052] Specifically, the end edge position of the boss has an outwardly extending axial limit plate 204. When the first clip 101 and the second clip 202 are engaged, the inner end of the axial limit plate 204 abuts against the end position of the magnetic rotor 1, thereby preventing the magnetic rotor 1 and the guide rail 2 from moving relative to each other in the axial direction. In this example, there are two axial limit plates 204, which are evenly distributed around the center of the guide rail 2 and are located in the middle position between the two open slots 203.

[0053] Specifically, a side of the first clip 101 close to the proximal port of the magnetic rotor 1 is a first inclined surface 1012, and the vertical distance from the first inclined surface 1012 to the proximal port of the magnetic rotor 1 gradually increases from the outside to the inside; a side of the first clip 101 away from the proximal port of the magnetic rotor 1 is a first plane 1011, and the first plane 1011 is perpendicular to the center line of the magnetic rotor 1.

[0054] More specifically, a side of the second clip 202 close to the proximal port of the magnetic rotor 1 is a second plane 2021, and the second plane 2021 is perpendicular to the center line of the guide rail 2; a side of the second clip 202 away from the proximal port of the magnetic rotor 1 is a second inclined surface 2022, and the vertical distance from the second inclined surface 2022 to the proximal port of the magnetic rotor 1 gradually increases from the outside to the inside.

[0055] During the assembly process of the first clip 101 and the second clip 202, the first inclined surface 1012 and the second inclined surface 2022 can first contact each other. After being subjected to force, the second clip 202 will be deformed, thereby further moving the guide rail 2 axially toward the inside of the magnetic rotor 1, and finally making the first plane 1011 contact the second plane 2021. At the same time, the axial limit plate 204 can also abut the end position of the magnetic rotor 1, completing the assembly process; it is mainly used to facilitate the rapid assembly of the first clip 101 and the second clip 202, improve the efficiency of assembly, and prevent the two from easily separating.

[0056] Specifically, the rotor assembly further includes:

[0057] The screw sleeve 5 is coaxially connected to the end of the guide rail 2, and one end extends toward the outer end of the magnetic rotor 1. When the guide rail 2 is not connected to the magnetic rotor 1, the screw sleeve 5 is nested and fixed with the guide rail 2, so that the screw sleeve 5 and the guide rail 2 form an integral structure;

[0058] One end of the screw rod 6 is inserted into the screw rod sleeve 5 and is fixedly connected to the screw rod sleeve 5. The screw rod 6 and the screw rod sleeve 5 are both hollow structures, which are used to replace the structure of the traditional center rod. That is, during the assembly process, the screw rod 6 is press-fitted to the end of the screw rod sleeve 5 in a tight fit manner. The end is located outside the port of the magnetic rotor 1, thereby avoiding the problem of expansion of the components caused by press-fitting and causing cracking of the magnetic rotor 1;

[0059] The valve needle 7 is coaxially and movably arranged in the center hole of the screw rod 6, and the end portion is connected to the support seat 4. A spring 3 is provided between the support seat 4 and the step root of the inner hole of the guide rail 2, which is mainly used to realize the axial movement of the valve needle 7 in the screw rod 6 and the screw rod sleeve 5, so as to realize the subsequent opening and closing of the electronic expansion valve. The structure and principle of this part of the valve needle 7, the support seat 4 and the spring 3 belong to conventional technical means in the prior art and will not be elaborated on here.

[0060] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A rotor assembly of an electronic expansion valve, characterized in that: include: The magnetic rotor (1) has a hollow structure inside, and has a plurality of first buckles (101) distributed around its central axis on its inner wall; A guide rail (2) is arranged at the center of the magnetic rotor (1), and has a truncated cone (201) extending in a radial direction at one end, the truncated cone (201) is provided with opening slots (203) in the circumferential direction, the same number as the first buckles (101), and the interiors of the opening slots (203) are provided with second buckles (202) that cooperate with the first buckles (101); When the guide rail (2) is axially installed into the interior of the magnetic rotor (1), the first buckle (101) contacts the second buckle (202), and after the second buckle (202) is elastically deformed, the second buckle (202) can be buckled onto the first buckle (101).

2. The rotor assembly of an electronic expansion valve according to claim 1, characterized in that: The magnetic rotor (1) further comprises: Rotational limiting plates (102) are arranged on the inner wall of the magnetic rotor (1) and extend toward the center of the magnetic rotor (1), and are arranged in pairs at both sides of the first buckle (101); After the first buckle (101) and the second buckle (202) are buckled together, the first buckle (101) and the second buckle (202) are both located in the space between the two rotation limiting plates (102), and the rotation limiting plates (102) are placed in the opening groove (203) of the truncated table (201).

3. The rotor assembly of an electronic expansion valve according to claim 2, characterized in that: The number of the first buckles (101), the opening slots (203), and the second buckles (202) are all two, and they are evenly distributed around the center line of the magnetic rotor (1).

4. The rotor assembly of an electronic expansion valve according to claim 1, characterized in that: An outwardly extending axial limiting plate (204) is provided at the end edge of the truncated table (201); when the first buckle (101) and the second buckle (202) are engaged, the inner end of the axial limiting plate (204) abuts against the end position of the magnetic rotor (1), thereby preventing the magnetic rotor (1) and the guide rail (2) from relative movement in the axial direction.

5. The rotor assembly of an electronic expansion valve according to claim 1, characterized in that: A side of the first clip (101) close to the proximal port of the magnetic rotor (1) is a first inclined surface (1012), and a vertical distance from the first inclined surface (1012) to the proximal port of the magnetic rotor (1) gradually increases from the outside to the inside; a side of the first clip (101) away from the proximal port of the magnetic rotor (1) is a first plane (1011), and the first plane (1011) is perpendicular to the center line of the magnetic rotor (1).

6. The rotor assembly of an electronic expansion valve according to claim 5, characterized in that: A side of the second clip (202) close to the proximal port of the magnetic rotor (1) is a second plane (2021), and the second plane (2021) is perpendicular to the center line of the guide rail (2); a side of the second clip (202) away from the proximal port of the magnetic rotor (1) is a second inclined surface (2022), and a vertical distance from the second inclined surface (2022) to the proximal port of the magnetic rotor (1) gradually increases from the outside to the inside.

7. The rotor assembly of an electronic expansion valve according to claim 1, characterized in that: The rotor assembly further comprises: A screw sleeve (5) is coaxially connected to the end of the guide rail (2), and one end of the screw sleeve extends toward the outer end of the magnetic rotor (1); A screw rod (6), one end of which is inserted into the screw rod sleeve (5) and fixedly connected to the screw rod sleeve (5); The valve needle (7) is coaxially and movably arranged in the central hole of the screw rod (6), and the end thereof is connected to the support seat (4). A spring (3) is provided between the support seat (4) and the step root of the inner hole of the guide rail (2).

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