A motor fixing structure and an electric valve including the same

Abstract

The present invention discloses a motor fixing structure and an electric valve including the structure. The housing of the electric valve of the present invention includes an upper section and a lower section. The outer diameter of the lower section is larger than the outer diameter of the upper section. The bottom of the insertion hole abuts against the top position of the lower section. The stator also includes an elastic fixing sheet. The elastic fixing sheet is cantilevered downward to set a plurality of elastic sheets. The elastic sheets are arranged circumferentially around the outer circumference of the lower section. The elastic sheet has a convex portion radially protruding inward toward the center direction of the lower section. The outer circumference of the lower section is provided with a concave portion that interlocks with the convex portion, thereby realizing the assembly of the stator to the housing. The present invention reduces the force of the elastic fixing sheet into the concave portion of the lower section of the housing by forming a long strip-shaped concave portion and a concave portion that interlocks with the convex portion on the lower section of the housing, thereby improving the stability and convenience of assembling the housing and the spindle.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration electric valve devices, and in particular to a motor fixing structure and an electric valve comprising the structure. Background Art

[0002] The main application of the electric valve is in the refrigeration or heating system. By changing the valve port flow area of ​​the electric valve, it is linked with the variable frequency compressor in the system to control the refrigerant pressure of the refrigeration or heating system. Existing electric valves are usually driven by stepper motors. The threaded mechanism converts the motor's rotational motion into linear motion, so that the conical valve core elastically connected to the thread approaches or moves away from the valve port. Therefore, in order to ensure the stability of the stepper motor and the convenience of the electric valve assembly, the assembly and fixation between the stepper motor rotor and the stator is very important.

[0003] Patent publication number CN 109253533A discloses an electric valve and a refrigeration cycle system: in the electric valve, the stator is easily installed relative to the valve body and the shell, and a bracket is installed at a position around the opening of the insertion hole on the valve body side of the stator, and the bracket is composed of an elastic sheet and a convex portion. The elastic sheet and the convex portion are arranged in the skirt portion from the valve body side, and a concave portion is formed on the outer periphery of the large diameter portion of the shell. The shell is embedded in the cylindrical insertion hole of the stator, and the convex portion of the bracket is engaged with the concave portion of the shell. When the stator is assembled to the shell, the convex portion of the bracket does not interfere with the small diameter portion of the shell. The electric valve divides the shell into a small diameter portion and a large diameter portion, ensuring that the convex portion of the bracket does not interfere with the small diameter portion of the shell, which facilitates assembly. However, due to the influence of size, it is difficult to achieve a smooth transition from the small diameter portion to the large diameter portion. When the convex portion of the bracket slides into the large diameter portion, there is a lot of resistance, and a lot of force is required to slide the convex point of the bracket into the large diameter portion. The assembly force is very large, resulting in inconvenient assembly. At the same time, dotting the shell will cause the shell to deform, affecting subsequent installation, especially when the shell becomes oval, it will affect the subsequent laser welding of the shell and the valve seat, resulting in laser welding defects, thus affecting the sealing performance of the product. In addition, when the convex and concave points are engaged, the transition is relatively smooth, which can easily cause problems such as insufficient engagement force. Summary of the invention

[0004] In view of the problems existing in the above background technology, the present invention aims to provide a motor fixing structure and an electric valve including the structure.

[0005] To this end, the present invention adopts the following technical solution: a motor fixing structure, the stator of the electric valve is provided with an inserting hole for inserting the housing part of the electric valve, the magnetic rotor is arranged in the inner cavity of the housing part, and the housing part comprises an upper section and a lower section, the outer diameter of the lower section is larger than the outer diameter of the upper section, and the bottom of the inserting hole abuts against the top position of the lower section;

[0006] The stator also includes an elastic fixing plate, which is cantilevered downward to form a plurality of elastic plates, which are arranged circumferentially around the outer circumference of the lower section. The elastic plates have a convex portion that protrudes radially inward toward the center of the lower section, and the outer circumference of the lower section is provided with a concave portion that engages with the convex portion, thereby realizing the assembly of the stator to the shell portion.

[0007] As a supplement and improvement to the above technical solution, the present invention also includes the following technical features.

[0008] A strip-shaped depression is arranged adjacent to the concave portion, and the strip-shaped depression extends upward to the top of the lower section, and the lower section is in a cone shape with a larger top and a smaller bottom. When the stator is assembled, the convex portion on the elastic sheet is inserted into the lower section along the strip-shaped depression. Since the lower section is in a cone shape with a larger top and a smaller bottom, the interference between the convex portion and the lower section can be reduced, thereby reducing the assembly force and improving the convenience of assembly.

[0009] The concave portion is a groove or a through hole.

[0010] The convex portion is in a conical shape with a larger outer portion and a smaller inner portion, and the cone angle α formed by the convex portion is less than 45 degrees. Since the conical surface of the conical portion is engaged with the edge of the concave portion, a larger engaging force can be generated, which has a good effect on preventing the stator from axial disengagement and circumferential rotation. This structural setting can greatly improve the stability of the assembly of the two.

[0011] The top surface of the convex part is spherical, so that the convex part can be easily rotated on the lower section during loading and unloading, thereby reducing the rotation torque.

[0012] An electric valve including the above motor fixing structure includes a valve housing, wherein the bottom inner side of the upper section of the housing portion is sealed and welded to the top outer side of the valve housing portion to form a sealing weld, and the upper section is located above the sealing weld. With this structure, machining a recessed portion on the lower section does not affect the dimensional accuracy of the upper section, and at the same time, the recessed portion is outside the sealing body formed between the valve housing and the housing portion, and machining the recessed portion does not affect the sealing performance of the valve body.

[0013] The elastic fixing sheet is fixed by plastic welding through the plastic boss formed by encapsulating the stator, and the plastic boss passes through the elastic fixing sheet, thereby ensuring the assembly stability of the stator and the valve body.

[0014] The bottom of the elastic fixing sheet is also provided with a lower supporting portion cantilevered downwards, and the lower supporting portion is used for supporting the transition position between the upper section and the lower section.

[0015] The present invention can achieve the following beneficial effects: 1. The present invention reduces the force of the elastic fixing plate being inserted into the concave portion of the lower section of the shell by forming a long strip-shaped recess and a recess that engages with the convex portion on the lower section of the shell, thereby improving the stability and convenience of assembling the shell and the ingot. 2. The present invention designs the convex portion into a cone shape, which can increase the engaging force and engaging torque and improve the reliability of assembly; the elastic plate is provided with a plurality of recesses that engage with the lower section of the shell at the same time, which can improve the stability of the engagement. 3. The electric valve of the present invention arranges the recess of the lower section of the shell at the lower part of the weld, which can prevent the deformation of the recess molding and the matching part of the valve shell, and at the same time, the small hole of the recess does not affect the air tightness of the product. 4. The elastic fixing plate of the present invention is provided with a support portion, which can prevent the stator from being over-installed and improve the convenience of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the exploded structure of the electric valve of the present invention.

[0017] Figure 2 It is a schematic diagram of the stator structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the assembly appearance of the electric valve of the present invention. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] like Figure 1-Figure 3 As shown, the stator 1 of the electric valve of the present invention is provided with an insertion hole for inserting the housing part 2 of the electric valve, and the magnetic rotor 4 is arranged in the inner cavity of the housing part 2. The housing part 2 includes an upper section 21 and a lower section 22. The outer diameter of the lower section 22 is larger than the outer diameter of the upper section 21, and the bottom of the insertion hole abuts against the top position of the lower section 22. The stator 1 also includes an elastic fixing sheet 3, and the elastic fixing sheet 3 is suspended downwardly and provided with two elastic sheets 31. The elastic sheets 31 are arranged symmetrically around the outer circumference of the lower section 22. The elastic sheet 31 has a convex portion 32 radially protruding inwardly toward the center direction of the lower section, and the outer circumference of the lower section 22 is provided with a convex portion 221 that is mutually engaged with the convex portion 32. A long strip-shaped recess 222 is provided adjacent to the convex portion 221, and the long strip-shaped recess 222 extends upward to the top of the lower section 22. The lower section 22 is in a cone shape with a larger upper portion and a smaller lower portion. Preferably, the convex portion 221 is a through hole, the convex portion 32 is in a cone shape that is larger on the outside and smaller on the inside, and the cone angle α formed therein is less than 45 degrees, and the top surface of the cone is a spherical surface.

[0021] The electric valve of the present invention comprises a valve housing 5, the bottom inner side of the upper section 21 of the housing 2 is sealed and welded with the top outer side of the valve housing 5 to form a sealing weld 51, and the upper section 21 is located above the sealing weld 51. Preferably, the elastic fixing sheet 3 is fixed by plastic welding through the plastic boss 12 formed by the stator package 11, and the plastic boss 12 passes through the elastic fixing sheet 3. The bottom of the elastic fixing sheet 3 is also provided with a downwardly cantilevered lower support portion 33, which is used for supporting the transition position between the upper section 21 and the lower section 22.

[0022] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A motor fixing structure, wherein a stator (1) of an electric valve is provided with an insertion hole for inserting a housing portion (2) of the electric valve, and a magnetic rotor (4) is arranged in an inner cavity of the housing portion (2), characterized in that: The housing portion (2) comprises an upper portion (21) and a lower portion (22); the outer diameter of the lower portion (22) is larger than the outer diameter of the upper portion (21); the lower portion (22) is in a conical shape with a larger upper portion and a smaller lower portion; the bottom inner portion of the upper portion (21) serves as a welding portion for sealing and welding with the top outer portion of the electric valve housing (5); and the bottom of the insertion hole abuts against the top position of the lower portion (22); The stator (1) further comprises an elastic fixing sheet (3), wherein the elastic fixing sheet (3) is cantilevered downwardly to form a plurality of elastic sheets (31), the elastic sheets (31) being arranged circumferentially around the outer circumference of the lower section (22), the elastic sheets (31) having a convex portion (32) protruding radially inwardly toward the center direction of the lower section, and the outer circumference of the lower section (22) is provided with a concave portion (221) that engages with the convex portion (32); and a long strip-shaped recess (222) is provided adjacent to the recess (221), and the long strip-shaped recess (222) extends upwardly to the top of the lower section (22).

2. A motor fixing structure according to claim 1, characterized in that: The recessed portion (221) is a groove or a through hole.

3. A motor fixing structure according to claim 2, characterized in that: The convex portion (32) is in the shape of a cone that is larger on the outside and smaller on the inside, and the cone angle formed by the cone is less than 45 degrees.

4. A motor fixing structure according to claim 3, characterized in that: The top surface of the convex portion is spherical.

5. An electric valve comprising a motor fixing structure as claimed in claim 1, 2, 3 or 4, comprising a valve housing (5), characterized in that: The bottom inner side of the upper section (21) of the shell body (2) is sealed and welded to the top outer side of the valve housing (5) to form a sealing weld (51), and the upper section (21) is located above the sealing weld (51).

6. The electric valve according to claim 5, characterized in that: The elastic fixing sheet (3) is fixed by plastic welding via a plastic boss (12) formed by the stator envelope (11), and the plastic boss (12) passes through the elastic fixing sheet (3).

7. The electric valve according to claim 5 or 6, characterized in that: The bottom of the elastic fixing plate (3) is also provided with a lower supporting portion (33) cantilevered downwards, and the lower supporting portion (33) is used to support the transition position between the upper section (21) and the lower section (22).

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