Electric valve

Abstract

An electric valve comprises a shell component (4) and a valve body component (3), the shell component (4) is fixedly connected with the valve body component (3), a control component comprises a motor (11), the control component (1) is arranged in an inner cavity of the shell component (4), and compared with the background technology, the influence of water vapor on the motor (11) can be reduced.

Description

[0001] This application is a divisional application based on the original invention patent application number CN202080017088.1, filed on May 27, 2020 (priority number CN201922013399.8, priority date November 20, 2019), and the application name is “An Electric Valve”. Technical Field

[0002] The present invention relates to the technical field of fluid control, and in particular to an electric valve. Background Art

[0003] FIG1 is a cross-sectional schematic diagram of an electric valve given in the background art. As shown in FIG1 , the electric valve includes a housing 01, a valve body 02, a coil 03 and a rotor 04. The housing 01 and the valve body 02 are welded and fixed, the rotor 04 is arranged inside the housing 01, and the coil 03 is arranged outside the housing 01. In this structure, since the coil 03 is always exposed to the environment, it may be affected by the water vapor in the environment and cause short circuit damage. Summary of the invention

[0004] In response to the problems in the background technology, the inventor placed the entire motor in a housing component, and on this basis discovered a new problem: the heat generated by the operation of the motor cannot be discharged in time, and the increase in temperature may reduce the reliability of the motor.

[0005] The object of the present invention is to provide an electric valve, comprising a shell component, a control component and a gear reduction mechanism, wherein the control component and the gear reduction mechanism are arranged in the inner cavity of the shell component, the control component comprises a motor and a mounting plate, the motor and the mounting plate are fixedly connected, the stator and the rotor of the motor are located above the gear reduction mechanism, and the mounting plate is placed above the gear reduction mechanism; the gear reduction mechanism comprises a gear ring, the inner cavity of the shell component comprises an upper cavity located above the mounting plate and an inner cavity of the gear ring, the stator and the rotor are located in the upper cavity, and the rotating shaft portion of the motor is located in the inner cavity of the gear ring; the gear reduction mechanism comprises a connecting flow path, and the connecting flow path connects the upper cavity and the inner cavity of the gear ring.

[0006] In the electric valve provided by the present invention, the stator and rotor of the motor are located in the upper chamber. By providing a connecting flow path, the fluid in the electric valve can be introduced into the upper chamber, which is beneficial to the heat dissipation of the motor and improves the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a cross-sectional schematic diagram of an electric valve given in the background art;

[0008] FIG2 is a cross-sectional schematic diagram of an electric valve provided by the present invention;

[0009] Figure 3: A schematic diagram of the structure of the connector in Figure 2;

[0010] Figure 4a: a schematic diagram of the structure of the partition in Figure 2;

[0011] Figure 4b: a schematic structural diagram of the gear ring in Figure 2;

[0012] Figure 5: A schematic diagram of the structure of the output gear rack in Figure 2;

[0013] Figure 6 is a schematic structural diagram of the bearing member in Figure 2;

[0014] Figure 7: A schematic diagram of the matching of the gear ring, output gear frame and bearing member in Figure 2;

[0015] Figure 8 is a schematic cross-sectional view of the transmission shaft in Figure 2;

[0016] Figure 9 is a schematic diagram of the structure of another bearing component;

[0017] FIG10 a is a partial cross-sectional schematic diagram of a second electric valve provided by the present invention;

[0018] FIG10b is a schematic diagram showing the coordination of the rotating shaft, the transmission rod and the input gear in FIG10a;

[0019] FIG11 is a partial cross-sectional schematic diagram of a third electric valve provided by the present invention;

[0020] Figure 12: A schematic diagram of the structure of the valve body in Figure 11;

[0021] Figure 13: Schematic diagram of the structure of the bearing component in Figure 11.

[0022] In Figures 2 to 13:

[0023] 1- Control components;

[0024] 11 / 11'-motor, 111 / 111'-rotating shaft;

[0025] 112 / 112'-input gear, 1120 / 1120'-sun gear;

[0026] 1121-large diameter section, 1122-small diameter section, 1123-groove;

[0027] 1124-groove wall portion, 1125-convex ring;

[0028] 113-stator, 114-rotor, 115-upper bearing, 116-lower bearing;

[0029] 117-transmission rod, 1171-side wall, 12-lead, 13-mounting plate, 130-notch;

[0030] 2- Gear reduction mechanism;

[0031] 21-planetary gear, 22-planetary gear carrier, 221-first stage planetary gear carrier;

[0032] 2210-center through hole, 23-positioning rod;

[0033] 24- partition, 240- connecting flow path, 241- center hole;

[0034] 242-through hole, 243-radial through groove, 244-annular groove;

[0035] 25-gear ring, 250-inner cavity of the gear ring, 251-limiting groove;

[0036] 26- output gear rack, 261- disc-shaped body;

[0037] 262-hole portion, 263-protrusion portion;

[0038] 27 / 27A / 27B-bearing member, 271 / 271A-cylindrical portion, 272 / 272A-radial extension portion;

[0039] 273A-axial extension portion, 274 / 274A-axial through groove, 275-deficient portion;

[0040] 3 / 3A-valve body component, 30-inner cavity of valve body component, 31 / 31A-valve body;

[0041] 311 / 311A-main body, 312 / 312A-extending part;

[0042] 313-limiting boss, 314-recess;

[0043] 3120A-axial through hole, 32-valve core, 321-groove;

[0044] 33 / 33A-first valve seat, 33'-second valve seat;

[0045] 34-transmission shaft, 341-first keying portion, 342-second keying portion, 343-blind hole;

[0046] 36-first connecting pipe, 37-second connecting pipe;

[0047] 4-shell component, 40-inner cavity of the shell component, 401-upper cavity;

[0048] 41-upper shell, 411-protrusion;

[0049] 42-lower housing, 421-second step portion, 422-reduced diameter portion;

[0050] 5-connector, 51-socket;

[0051] 511-upper section, 5110-connection cavity, 512-middle section;

[0052] 513-lower section, 5130-sealed cavity, 514-first step portion;

[0053] 52-sealing glass, 53-pin. DETAILED DESCRIPTION

[0054] The core of the present invention is to provide an electric valve, wherein the valve body component is fixedly connected to the shell component, the valve cavity of the electric valve includes the inner cavity of the shell component and the inner cavity of the valve body component, the inner cavity of the shell component and the inner cavity of the valve body component are connected, and the control component includes a motor, and the control component is arranged in the inner cavity of the shell component. Compared with the background technology, the influence of water vapor on the motor can be reduced.

[0055] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] It should be noted that the directional words such as upper and lower involved in this article are defined by the positions of the components in Figures 2 to 13 and the positions of the components relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0057] It should also be noted that the "rotation" involved in this article refers to movement in the circular direction, which includes both movement of more than one circle (360°) and movement within one circle (360°).

[0058] Fig. 2 is a cross-sectional schematic diagram of an electric valve provided by the present invention; Fig. 3 is a structural schematic diagram of the plug-in component in Fig. 2; Fig. 4a is a structural schematic diagram of the partition in Fig. 2; Fig. 4b is a structural schematic diagram of the gear ring in Fig. 2; Fig. 5 is a structural schematic diagram of the output gear rack in Fig. 2; Fig. 6 is a structural schematic diagram of the bearing member in Fig. 2; Fig. 7 is a schematic diagram of the matching of the gear ring, the output gear rack and the bearing member in Fig. 2; and Fig. 8 is a cross-sectional schematic diagram of the transmission shaft in Fig. 2.

[0059] The electric valve includes a control component 1, a gear reduction mechanism 2, a valve body component 3, and a housing component 4. The valve cavity of the electric valve includes an inner cavity 30 of the valve body component and an inner cavity 40 of the housing component, and the inner cavity 30 of the valve body component and the inner cavity 40 of the housing component are connected. The control component 1 and the gear reduction mechanism 2 are arranged in the inner cavity 40 of the housing component.

[0060] The control component 1 includes a motor 11, a lead 12 and a mounting plate 13. The motor 11 includes a stator 113, a rotor 114, a rotating shaft 111, an input gear 112, and an upper bearing 115 and a lower bearing 116 for positioning the rotating shaft 111. The stator 113 and the rotor 114 are located above the gear reduction mechanism 2. The lower bearing 116 is close to the input gear 112, and the rotating shaft 111 passes through the lower bearing 116. By energizing the lead 12, the stator 113 can be energized to drive the rotor 114 to rotate circumferentially, and the rotor 114 is fixedly connected to the rotating shaft 111. The rotating shaft 111 is made of stainless steel bar material and is rotatably connected to the input gear 112. The "rotational connection" here includes a fixed connection between the rotating shaft 111 and the input gear 112, and also includes a circumferential limit connection between the rotating shaft 111 and the input gear 112, as long as the rotating shaft 111 can drive the input gear 112 to rotate. Specifically, the rotating shaft 111 and the input gear 112 can be fixed by interference fit. Of course, the rotating shaft 111 and the input gear 112 can also be connected by keyway fit. The motor 11 and the mounting plate 13 are fixedly connected by welding, and the mounting plate 13 and the housing component 4 are fixedly connected by welding. Of course, the mounting plate 13 can also be integrally formed with the motor 11. In this way, the motor 11 is fixed by the mounting plate 13, thereby ensuring the smooth operation of the rotating shaft 111.

[0061] The gear reduction mechanism 2 is arranged in the inner cavity 40 of the housing component. The gear reduction mechanism 2 is a planetary gear mechanism, including planetary gears 21, a planetary gear carrier 22 and an output gear carrier 26. The planetary gears 21 are mounted on the planetary gear carrier 22, and the planetary gears 21 are meshed with the aforementioned input gears 112. The input gears 112 can drive the planetary gears 21 to rotate circumferentially, and the planetary gears 21 can drive the output gear carrier 26 to rotate circumferentially.

[0062] The valve body component 3 includes a valve body 31, a valve core 32, a first valve seat 33, a second valve seat 33' and a transmission shaft 34. The valve body 31 is roughly hollow and tubular, and is made of stainless steel material. The first valve seat 33 is fixed to one end of the valve body 31 by welding, and the second valve seat 33' is fixed to the other end of the valve body 31 by welding. The first valve seat 33 is welded and fixed to the first connecting pipe 36, and the second valve seat 33' is welded and fixed to the second connecting pipe 37. One of the first connecting pipe 36 and the second connecting pipe 37 serves as the flow path inlet, and the other serves as the flow path outlet. The valve core 32 is roughly spherical and is arranged in the inner cavity 30 of the valve body component, and is located between the first valve seat 33 and the second valve seat 33'. The valve body 31 includes a body part 311 and an extension part 312 extending outward from the circumferential outer wall of the body part 311, and the extension part 312 is roughly hollow and tubular. In this embodiment, the output gear frame 26 is rotatably connected to the transmission shaft 34, and the transmission shaft 34 is rotatably connected to the valve core 32. Specifically, the transmission shaft 34 is generally in the shape of a cylindrical rod. The transmission shaft 34 passes through the extension portion 312. One end of the transmission shaft 34 extends into the inner cavity 40 of the shell component and is connected to the keyway of the hole portion 262 of the output gear rack 26. The output gear rack 26 can drive the transmission shaft 34 to rotate circumferentially. The other end of the transmission shaft 34 extends into the inner cavity 30 of the valve body component and is connected to the keyway of the groove 321 of the valve core 32. The transmission shaft 34 can drive the valve core 32 to rotate circumferentially.

[0063] The housing component 4 includes an upper housing 41 and a lower housing 42, and the upper housing 41 and the lower housing 42 are respectively formed by stamping of stainless steel plates. The wall thickness of the lower housing 42 is greater than that of the upper housing 41, and the upper end of the lower housing 42 includes a second step portion 421 with the step surface facing upward, and the upper housing 41 is placed on the second step portion 421, and the upper housing 41 and the lower housing 42 are fixed by welding. The lower end of the lower housing 42 includes a reduced diameter portion 422, and the reduced diameter portion 422 is at least partially located in the extension portion 312 of the valve body 31, and the outer wall of the reduced diameter portion 422 is fixed by welding to the inner wall of the extension portion 312.

[0064] In this embodiment, the valve body 31 is fixedly connected to the housing component 4, and the motor 11 is disposed in the inner cavity 40 of the housing component. The beneficial effect is that the influence of water vapor on the motor 11 can be reduced, and the risk of the motor 11 short circuit can be reduced.

[0065] Further, as shown in FIG. 2 , in this embodiment, the rotating shaft 111 is fixedly connected to the input gear 112, and the circumferential outer wall of the input gear 112 includes a sun gear 1120. The gear reduction mechanism 2 also includes a gear ring 25 and a partition 24, and the gear ring 25 and the partition 24 are fixed by welding. Of course, both can also be limited in the circumferential direction, as long as the partition 24 does not rotate circumferentially relative to the gear ring 25. The partition 24 includes a center hole 241, and the lower bearing 116 is at least partially located in the center hole 241, and the lower bearing 116 is clearance-matched with the center hole 241. Such an arrangement can achieve the positioning of the motor 11. In the specific assembly process, after the motor 11 is positioned, the mounting plate 13 is welded to the inner wall of the lower housing 42 to achieve fixation. The gear ring 25 is roughly cylindrical, the sun gear 1120 is located in the inner cavity 250 of the gear ring 25, and the planetary gear 21 is located in the inner cavity 250 of the gear ring 25, and the sun gear 1120 is meshed with the planetary gear 21.

[0066] As shown in Fig. 2 and Fig. 4a, the mounting plate 13 is placed on the partition 24, and the mounting plate 13 includes a notch 130 located on its outer periphery. The inner cavity 40 of the housing component includes an upper cavity 401 located above the mounting plate 13 and the inner cavity 250 of the gear ring, and the upper cavity 401 is connected with the notch 130. The above-mentioned stator 113 and rotor 114 are located in the upper cavity 401. The partition 24 includes a connecting flow path 240 connecting the notch 130 and the inner cavity 250 of the gear ring, and the connecting flow path 240 includes a through hole 242 axially penetrating the partition 24 and a radial through groove 243 radially extending from the through hole 242 to the circumferential outer wall of the partition 24. By providing the connecting flow path 240 and the notch 130, the upper cavity 401 is connected with the inner cavity 250 of the gear ring, and the fluid in the electric valve is introduced into the upper cavity 401, which is beneficial to the heat dissipation of the motor 11. At the same time, the upper cavity 401 will not form a liquid seal cavity, thereby improving the safety of the electric valve.

[0067] Furthermore, as shown in FIG4 a, the communication flow path 240 further includes an annular groove 244, and at least two through holes 242 are symmetrically arranged relative to the central hole 241, and the annular groove 244 connects the through holes 242. Such an arrangement improves the flow capacity of the communication flow path 240.

[0068] The planetary gear carrier 22 includes a first-stage planetary gear carrier 221, which includes a central through hole 2210, and the lower end of the rotating shaft 111 is located in the central through hole 2210. The gear reduction mechanism 2 also includes a positioning rod 23, which is made by turning a metal bar, and the upper end of the transmission shaft 34 includes a blind hole 343. The upper end of the positioning rod 23 is located in the central through hole 2210, and the lower end of the positioning rod 23 is located in the blind hole 343. In this way, the planetary gear carrier 22 can be positioned, the operating stability of the gear reduction mechanism 2 is improved, and the risk of jamming is reduced.

[0069] FIG10 a is a partial cross-sectional schematic diagram of the second electric valve provided by the present invention; FIG10 b is a schematic diagram of the coordination of the rotating shaft, the transmission rod and the input gear in FIG10 a .

[0070] The difference between this embodiment and the above-mentioned embodiment lies in the structure of the control component and the connection relationship between the control component and the gear reduction mechanism.

[0071] As shown in Fig. 10a and Fig. 10b, the motor 11' comprises a rotating shaft 111' and a transmission rod 117 fixedly connected to the rotating shaft 111', the transmission rod 117 is roughly plate-shaped and comprises a side wall portion 1171. The input gear 112' comprises a large diameter section 1121 and a small diameter section 1122, the upper end of the large diameter section 1121 is provided with a groove 1123, the transmission rod 117 is at least partially located in the groove 1123, the groove 1123 comprises a groove wall portion 1124 capable of abutting against the side wall portion 1171, and there is a circumferential movement gap between the groove wall portion 1124 and the side wall portion 1171. The circumferential outer wall of the small diameter section 1122 comprises a sun gear 1120', the sun gear 1120' is at least partially located in the inner cavity 250 of the gear ring, the sun gear 1120' is meshed with the planetary gear 21, and the small diameter section 1122 passes through the central hole 241 of the partition 24.

[0072] Further, as shown in Fig. 10a, a convex ring 1125 is provided at the lower end of the large diameter section 1121, and the longitudinal section profile of the lower end of the convex ring 1125 is generally arc-shaped, and the convex ring 1125 abuts against the partition plate 24. The convex ring 1125 is provided to reduce the friction force of the input gear 112' during circumferential rotation and improve the service life of the input gear 112'.

[0073] Further, as shown in Fig. 2 and Fig. 3, the electric valve further comprises a plug-in component 5, and the plug-in component 5 comprises a socket 51, a sealing glass 52 and a plug pin 53. The sealing glass 52 is fixed in the socket 51 by sintering. Specifically, the socket 51 is made of stainless steel material, and is generally hollow in structure, comprising an upper section 511, a middle section 512 and a lower section 513. The upper section 511 has a plug-in cavity 5110, and the lower section 513 has a sealing cavity 5130. The sealing cavity 5130 communicates with the inner cavity 40 of the shell component. The middle section 512 and the sealing glass 52 are fixed and sealed by sintering, and the plug-in cavity 5110 is isolated from the sealing cavity 5130. The pin 53 is inserted through the sealing glass 52, the upper end of the pin 53 extends into the connector cavity 5110 and can be electrically connected to an external connector, the lower end of the pin 53 extends into the sealing cavity 5130 and is electrically connected to the lead 12 of the control component 1, and the pin 53 and the sealing glass 52 are fixed by sintering.

[0074] Furthermore, the upper shell 41 includes a protruding portion 411 protruding upward, and the lower end of the socket 51 includes a first step portion 514 with a step surface facing downward, and the protruding portion 411 is welded and fixed to the first step portion 514 .

[0075] As shown in FIG2 , the transmission shaft 34 passes through the reduced diameter portion 422 of the lower housing 42, and a bearing 27 is provided between the reduced diameter portion 422 and the transmission shaft 34. The bearing 27 is made of wear-resistant metal material powder metallurgy. The beneficial effect of such a setting is that the wear of the transmission shaft 34 during the circumferential rotation process is reduced, and the service life of the transmission shaft 34 is increased.

[0076] Of course, it is conceivable that the lower housing 42 and the valve body 31 can also be fixed by welding the inner wall of the reduced diameter portion 422 to the outer wall of the extension portion 312 of the valve body 31. The transmission shaft 34 passes through the extension portion 312, and a bearing 27 is provided between the extension portion 312 and the transmission shaft 34. This embodiment has the same technical effect as the above embodiment.

[0077] As shown in Figures 2, 5 and 7, one end of the transmission shaft 34 facing the control component 1 includes a first keying portion 341 keyed to the hole portion 262 of the output gear rack 26, and the first keying portion 341 is located in the inner cavity 40 of the shell component. The cross-section of the first keying portion 341 is non-circular, and the first keying portion 341 extends into the hole portion 262 of the output gear rack 26; the other end of the transmission shaft 34 includes a second keying portion 342 connected to the keyway of the valve core 32, and the second keying portion 342 is located in the inner cavity 30 of the valve body component. The lower end of the second keying portion 342 extends into the groove 321 of the valve core 32, and the second keying portion 342 cooperates with the keyway of the valve core 32.

[0078] As shown in Fig. 4b, Fig. 5, Fig. 6 and Fig. 7, in this embodiment, a limiting groove 251 is provided at the lower end of the gear ring 25. The output gear frame 26 includes a disc-shaped body portion 261, a hole portion 262 is provided in the disc-shaped body portion 261, the cross section of the hole portion 262 is non-circular, and a protrusion 263 is provided on one side of the disc-shaped body portion 261 facing the valve core 32. In this embodiment, the bearing member 27 includes a cylindrical portion 271 and a radial extension portion 272 extending radially outward from the circumferential outer wall of the cylindrical portion 271, the cylindrical portion 271 includes an axial through groove 274, the axial through groove 274 connects the inner cavity 40 of the shell component and the inner cavity 30 of the valve body component; the outer end edge of the radial extension portion 272 is welded and fixed to the inner wall of the lower shell 42, and one end of the radial extension portion 272 away from the cylindrical portion 271 cooperates with the keyway of the limiting groove 251, and the other end of the radial extension portion 272 cooperates with the protrusion 263 to limit the circumferential rotation stroke of the output gear frame 26.

[0079] In the above-mentioned implementation scheme, since the radial extension portion 272 of the bearing member 27 is fixed to the lower shell body 42 by welding, on the one hand, the radial extension portion 272 cooperates with the keyway of the limiting groove 251 of the gear ring 25, so that the gear ring 25 is limited in the circumferential direction, and on the other hand, the protrusion 263 is limited by the radial extension portion 272, thereby limiting the circumferential rotation stroke of the output gear frame 26, that is, limiting the circumferential rotation stroke of the transmission shaft 34. Such a setting can limit the fully open position and the fully closed position of the valve core 32, thereby realizing the full open, full closed and flow regulation functions of the electric valve.

[0080] FIG. 9 is a schematic structural diagram of another bearing component.

[0081] As shown in FIG9 , the bearing member 27A includes a cylindrical portion 271A, a radial extension portion 272A extending radially outward from the circumferential outer wall of the cylindrical portion 271A, and an axial extension portion 273A extending axially upward from the radial extension portion 272A. The cylindrical portion 271A includes an axial through groove 274A, and the axial through groove 274A communicates with the inner cavity 40 of the housing component and the inner cavity 30 of the valve body component; the outer wall of the axial extension portion 273A is welded and fixed to the inner wall of the lower housing 42, the axial extension portion 273A is located in the limiting groove 251, and cooperates with the keyway of the limiting groove 251, and the radial extension portion 272 cooperates with the protrusion 263 to limit the circumferential rotation stroke of the output gear frame 26.

[0082] Furthermore, as shown in FIG. 5 , the protrusions 263 are provided in two numbers and are symmetrically arranged relative to the central axis of the hole 262. Such an arrangement is conducive to the stable circumferential rotation of the output gear rack and reliable position limiting. Moreover, the protrusions 263 and the disc-shaped body 261 are integrally formed by plastic injection molding or by metal powder metallurgy. In this way, the strength of the output gear rack is enhanced and the position limiting is more reliable.

[0083] 11 is a partial cross-sectional schematic diagram of the third electric valve provided by the present invention; FIG. 12 is a structural schematic diagram of the valve body in FIG. 11 ; and FIG. 13 is a structural schematic diagram of the bearing member in FIG. 11 .

[0084] The difference between this embodiment and the above-mentioned embodiments lies in the structure of the valve body component, the stopping method and the bearing component.

[0085] As shown in Fig. 10, Fig. 11 and Fig. 12, in this embodiment, the valve body component 3A includes a valve body 31A, a transmission shaft 34, a first valve seat 33A and a valve core 32. The blank of the valve body 31A is made of forged or cast metal material, and the first valve seat 33A is made of lathe, forged or cast metal material. The valve body 31A includes a main body 311A ​​that is roughly cylindrical and an extension 312A that extends from the outer wall of the main body 311A ​​toward the control component 1. The extension 312A is provided with an axial through hole 3120A, and the cross section of the axial through hole 3120A is circular. The transmission shaft 34 passes through the axial through hole 3120A. In this embodiment, the inner wall of the reduced diameter portion 422 of the lower shell 42 is welded and fixed to the outer wall of the protruding portion 312A, and a bearing member 27B is provided between the protruding portion 312A and the transmission shaft 34. The bearing member 27B is formed by bending a metal plate, and the bearing member 27B has a missing portion 275, which connects the inner cavity 40 of the shell component and the inner cavity 30 of the valve body component.

[0086] In this embodiment, the upper end of the extension 312A includes a limiting boss 313, and there are two limiting bosses 313, which are symmetrically arranged relative to the central axis of the axial through hole 3120A. A recess 314 is formed between the two limiting bosses 313, and the recess 314 is located in the circumferential space between the two limiting bosses 313. The protrusion 263 of the output gear rack 26 is placed in the recess 314, and the protrusion 263 can abut against the limiting boss 313 to limit the circumferential rotation stroke of the output gear rack 26. In this embodiment, the limiting boss 313 is integrated into the valve body 31A, and there is no need to specially process the bearing component, and the bearing component is simple to process.

[0087] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electric valve, comprising a shell component, a control component and a gear reduction mechanism, wherein the control component and the gear reduction mechanism are arranged in the inner cavity of the shell component, the control component comprises a motor and a mounting plate, the motor and the mounting plate are fixedly connected, the stator and the rotor of the motor are located above the gear reduction mechanism, and the mounting plate is placed above the gear reduction mechanism; the gear reduction mechanism comprises a gear ring, the inner cavity of the shell component comprises an upper cavity located above the mounting plate and an inner cavity of the gear ring, the stator and the rotor are located in the upper cavity, and the rotating shaft portion of the motor is located in the inner cavity of the gear ring; the gear reduction mechanism comprises a connecting flow path, and the connecting flow path connects the upper cavity and the inner cavity of the gear ring.

2. The electric valve according to claim 1, characterized in that: The mounting plate includes a notch located on the outer periphery, the upper cavity is communicated with the notch, and the communicating flow path is communicated with the notch and the inner cavity of the gear ring.

3. The electric valve according to claim 1, characterized in that: The gear reduction mechanism further includes a partition plate, which is located above the gear ring. The communication flow path includes a through hole axially penetrating the partition plate and a through groove radially extending from the through hole to the circumferential outer wall of the partition plate.

4. The electric valve according to claim 3, characterized in that: The partition plate includes a central hole, the through holes are at least two and are symmetrically arranged relative to the central hole, and the connecting flow path also includes an annular groove, and the annular groove connects the through holes.

5. The electric valve according to claim 1, characterized in that: The gear reduction mechanism comprises a center hole, and the motor comprises a lower bearing, wherein the lower bearing is at least partially located in the center hole, and the lower bearing is clearance-matched with the center hole.

6. The electric valve according to claim 5, characterized in that: The rotating shaft passes through the lower bearing, the control component further comprises an input gear, the rotating shaft is fixedly connected to the input gear, the circumferential outer wall of the input gear comprises a sun gear, the sun gear is at least partially located in the inner cavity of the gear ring, the gear reduction mechanism comprises a planetary gear, the planetary gear is located in the inner cavity of the gear ring, the sun gear is meshed with the planetary gear; the gear reduction mechanism comprises an output gear frame, the planetary gear can drive the output gear frame to rotate; The electric valve also includes a valve core and a transmission shaft, one end of the transmission shaft extends into the hole of the output gear frame, and the output gear frame can drive the transmission shaft to rotate, and the other end of the transmission shaft extends into the groove of the valve core, and the transmission shaft can drive the valve core to rotate.

7. The electric valve according to claim 6, characterized in that: The gear reduction mechanism also includes a planetary gear carrier and a positioning rod, the planetary gears are arranged on the planetary gear carrier, the planetary gear carrier includes a first-stage planetary gear carrier, the first-stage planetary gear carrier includes a center through hole, the lower end of the rotating shaft is located in the center through hole, the upper end of the transmission shaft includes a blind hole, the upper end of the positioning rod is located in the center through hole, and the lower end of the positioning rod is located in the blind hole.

8. The electric valve according to any one of claims 1 to 7, characterized in that: It also includes a plug-in component, the plug-in component includes a socket, a sealing glass and a plug pin, the socket is welded and fixed to the shell component, the socket includes an upper section, a middle section and a lower section, the upper section includes a plug-in cavity, the sealing glass is fixed to the middle section by sintering, the lower section includes a sealing cavity, the sealing glass and the plug pin are fixed by sintering, the plug pin is inserted into the sealing glass, the upper end of the plug pin is located in the plug-in cavity, the lower end of the plug pin is located in the sealing cavity, and the lower end of the plug pin is electrically connected to the lead of the control component; The shell component includes an upper shell and a lower shell, the upper shell is welded and fixed to the lower shell, the upper end of the upper shell includes a protrusion protruding upward, the lower end of the socket includes a first step portion with a step surface facing downward, the protrusion is welded and fixed to the first step portion, the upper end of the lower shell includes a second step portion with a step surface facing upward, the upper shell is placed on the second step portion, and the upper shell is welded and fixed to the second step portion.

9. The electric valve according to any one of claims 1 to 7, characterized in that: It also includes a valve body component, the valve body component includes a transmission shaft, the shell component includes a reduced diameter portion, a bearing component is provided between the reduced diameter portion and the transmission shaft, the bearing component includes a cylindrical portion, a radial extension portion extending radially outward from the circumferential outer wall of the cylindrical portion, the cylindrical portion includes an axial through groove, the axial through groove connects the inner cavity of the gear ring and the inner cavity of the valve body component, and the radial extension portion cooperates with the output gear frame of the gear reduction mechanism to limit the circumferential rotation stroke of the output gear frame.

10. The electric valve according to claim 9, characterized in that: The bearing component also includes an axial extension portion extending axially upward from the radial extension portion, the outer wall of the axial extension portion is welded and fixed to the inner wall of the housing component, and a limiting groove is provided at the lower end of the gear ring, and the axial extension portion is located in the limiting groove.

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