Patent Publication Number: US-2022228671-A1

Title: Electric valve

Description:
CROSS-REFERENCED APPLICATIONS 
     This application is the national phase of international application No. PCT/CN2020/092464, titled “ELECTRIC VALVE”, filed on May 7, 2020, which claims the benefit of priorities to the following two Chinese patent applications, both of which are incorporated herein by reference, 
     1) Chinese Patent Application No. 201920938666.X, titled “ELECTRIC VALVE”, filed with the China National Intellectual Property Administration on Jun. 21, 2019; and 
     2) Chinese Patent Application No. 201922013399.8, titled “ELECTRIC VALVE”, filed with the China National Intellectual Property Administration on Nov. 20, 2019. 
    
    
     BACKGROUND 
     1. Field of the Disclosure 
     The present application relates to the technical field of fluid control, and in particular to an electric valve. 
     2. Discussion of the Background Art 
       FIG. 1  is a schematic sectional view of an electric valve in the conventional technology. As shown in  FIG. 1 , the electric valve includes a cover body  01 , a valve body  02 , a coil  03  and a rotor  04 , the cover body  01  is fixed to the valve body  02  by welding, the rotor  04  is arranged inside the cover body  01 , and the coil  03  is arranged outside the cover body  01 . In this structure, since the coil  03  is always exposed to the environment, short-circuit damage may be caused due to the influence of moisture in the environment. 
     Therefore, how to reduce the influence of the moisture in the environment on the coil provides an issue to improve for those skilled in the art. 
     SUMMARY 
     An object. of the present application is to provide an electric valve, which includes a housing component, a valve body component, a control component and a gear reduction mechanism. The housing component is fixedly connected to the valve body component, a valve chamber of the electric valve includes an inner chamber of the housing component and an inner chamber of the valve body component, and the inner chamber of the housing component is in communication with the inner chamber of the valve body component. The control component and the gear reduction mechanism are arranged in the inner chamber of the housing component. The control component includes a motor and an input gear. The motor is rotatably connected with the input gear. A stator and a rotor of the motor are located above the gear reduction mechanism. The gear reduction mechanism includes a planetary gear and an output gear carrier, the input gear meshes with the planetary gear, and the planetary gear is configured to drive the output gear carrier to rotate. The valve body component includes a valve body, a first valve seat, a valve core and a transmission shaft, the valve body is fixedly connected to the first valve seat, the valve core is arranged in the inner chamber of the valve body component, the output gear carrier is rotatably connected to the transmission shaft, and the transmission shaft is rotatably connected to the valve core. 
     In the electric valve according to the present application, the housing component is fixedly connected to the valve body component, the control component includes the motor, and the control component is arranged in the inner chamber of the housing component. Compared with the conventional technology, the influence of moisture on the motor can be reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic sectional view of an electric valve given in the conventional technology; 
         FIG. 2  is a schematic sectional view of an electric valve according to the present application; 
         FIG. 3  is a schematic structural view of a plug-in component in  FIG. 2 ; 
         FIG. 4 a    is a schematic structural view of a separator in  FIG. 2 ; 
         FIG. 4 b    is a schematic structural view of a gear ring in  FIG. 2 ; 
         FIG. 5  is a schematic structural view of an output gear carrier in  FIG. 2 ; 
         FIG. 6  is a schematic structural view of a bearing member in  FIG. 2 ; 
         FIG. 7  is a schematic view showing the cooperation of the gear ring, the output gear carrier and the bearing member in  FIG. 2 ; 
         FIG. 8  is a schematic sectional view of a transmission shaft in  FIG. 2 ; 
         FIG. 9  is a schematic structural view of another bearing member; 
         FIG. 10 a    is a schematic partial sectional view of a second electric valve according to the present application; 
         FIG. 10 b    is a schematic view showing the cooperation of a rotating shaft, a transmission rod, and an input gear in  FIG. 10   a;    
         FIG. 11  is a schematic partial sectional view of a third electric valve according to the present application; 
         FIG. 12  is a schematic structural view of a valve body in  FIG. 11 ; and 
         FIG. 13  is a schematic structural view of the bearing member in  FIG. 11 , 
     
    
    
     Reference numerals in  FIGS. 2 to 13  are as follows: 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                 1 control component; 
                   
               
               
                 11/11′ motor, 
                 111/111′ rotating shaft; 
               
               
                 112/112′ input gear; 
                 1120/1120′ sun gear; 
               
               
                 1121 large-diameter portion; 
                 1122 small-diameter portion; 
               
               
                 1123 groove of large-diameter portion; 
               
               
                 1124 groove wall portion, 
                 1125 protruding ring; 
               
               
                 113 stator; 
                 114 rotor; 
               
               
                 115 upper bearing; 
                 116 lower bearing; 
               
               
                 117 transmission rod; 
                 1171 side wall portion; 
               
               
                 12 lead wire; 
                 13 mounting plate; 
               
               
                 130 gap; 
               
               
                 2 gear reduction mechanism; 
               
               
                 21 planetary gear, 
                 22 planetary gear carrier; 
               
               
                 221 first-stage planetary gear carrier; 
               
               
                 2210 center through hole; 
                 23 positioning rod; 
               
               
                 24 separator; 
                 240 communication flow path; 
               
               
                 241 center hole; 
               
               
                 242 through hole; 
                 243 radial through groove; 
               
               
                 244 annular groove; 
               
               
                 25 gear ring; 
                 250 inner chamber of gear ring; 
               
               
                 251 limiting groove; 
               
               
                 26 output gear carrier, 
                 261 disc-shaped body portion; 
               
               
                 262 hole portion; 
                 263 protruding portion of disc-shaped body portion; 
               
               
                 27/27A/27B bearing member; 
                 271/271A cylindrical portion; 
               
               
                 272/272A radially extending portion; 
               
               
                 273A axially extending portion; 
                 274/274A axial through groove; 
               
               
                 275 notch portion; 
               
               
                 3/3A valve body component, 
                 30 inner chamber of valve body component, 
               
               
                 31/31A valve body; 
               
               
                 311/311A body portion, 
                 312/312A extending portion; 
               
               
                 313 limiting boss; 
                 314 recess portion; 
               
               
                 3120A axial through hole; 
                 32 valve core; 
               
               
                 321 groove of valve core; 
               
               
                 33/33A first valve seat; 
                 33′ second valve seat; 
               
               
                 34 transmission shaft; 
                 341 first key portion; 
               
               
                 342 second key portion; 
                 343 blind hole; 
               
               
                 36 first connecting pipe; 
                 37 second connecting pipe; 
               
               
                 4 housing component, 
                 40 inner chamber of housing component, 
               
               
                 401 upper chamber; 
               
               
                 41 upper housing; 
                 411 protruding portion of upper housing; 
               
               
                 42 lower housing; 
                 421 second stepped portion; 
               
               
                 422 reduced-diameter portion; 
               
               
                 5 plug-in component; 
                 51 plug-in socket; 
               
               
                 511 upper portion; 
                 5110 plug-in chamber; 
               
               
                 512 middle portion; 
               
               
                 513 lower portion; 
                 5130 sealing chamber; 
               
               
                 514 first stepped portion; 
               
               
                 52 sealing glass; 
                 53 pin. 
               
               
                   
               
            
           
         
       
     
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the electric, valve according to the present application, the housing component is fixedly connected to the valve body component, the control component includes the motor, and the control component is arranged in the inner chamber of the housing component. A control component includes a motor, and the control component is arranged in the inner chamber of the housing component. Compared with the conventional technology, the influence of moisture on the motor can be reduced. 
     In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail with reference to the drawings and specific embodiments. 
     It should be noted that, the orientation terms, such as upper and lower, involved in this application are defined with reference to the positions of the components in the figures and the relative positions of the components as shown in  FIGS. 2 to 13 , which are only for clarity and ease of describing the technical solutions. It will be appreciated that, those orientation terms used herein should not limit the protection scope of the present application. 
     It should be further noted that, the “rotation” referred to herein refers to movement in a circumferential direction, which includes not only rotation by one circle (360 degrees) or more, but also rotation by one circle (360 degrees) of less. 
       FIG. 2  is a schematic sectional view of an electric valve according to the present application;  FIG. 3  is a schematic structural view of a plug-in component in  FIG. 2 ;  FIG. 4 a    is a schematic structural view of a separator in  FIG. 2 ;  FIG. 4 b    is a schematic structural view of a gear ring in  FIG. 2 ;  FIG. 5  is a schematic structural view of an output gear carrier in  FIG. 2 ;  FIG. 6  is a schematic structural view of a bearing member in  FIG. 2 ;  FIG. 7  is a schematic view showing the cooperation of the gear ring, the output gear carrier and the bearing member in  FIG. 2 ;  FIG. 8  is a schematic sectional view of a transmission shaft in  FIG. 2 . 
     The electric valve includes a control component  1 , a gear reduction mechanism  2 , a valve body component  3  and a housing component  4 . A valve chamber of the electric valve includes an inner chamber  30  of the valve body component and an inner chamber  40  of the housing component, and the inner chamber the housing component. The control component  1  and the gear reduction mechanism  2  are arranged in the inner chamber  40  of the housing component. 
     The control component  1  includes a motor  11 , a lead wire  12  and a mounting plate  13 . The motor  11  includes a stator  113 , a rotor  114 , a rotating shaft  111 , an input gear  112 , an upper bearing  115  and a lower bearing  116  which are both configured to position 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  penetrates through the lower bearing  116 . By energizing the lead wire  12 , the stator  113  is 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 by processing a stainless steel bar and is rotatable connected to the input gear  112 . The “rotatably connected” herein includes that the rotating shaft  111  is fixedly connected to the input gear  112 , and also includes that the rotating shaft  111  is connected to the input gear  112  by circumferentially as long as the rotating shaft  111  can drive the rotating shaft  112  to rotate. Specifically, the rotating shaft  111  may be fixed to the input gear  112  ley interference fit. Besides, the rotating shaft  111  may be connected to the input gear  112  by key-groove cooperation. The motor  11  is fixedly connected to the mounting plate  13  by welding, the mounting plate  13  is fixedly connected to the housing component  4  by welding, or the mounting plate  13  may be integrally formed with the motor  11 . In this way, the motor  11  is fixed by the mounting plate  13 , which ensures the smooth operation of the rotating shaft  111 . 
     The gear reduction mechanism  2  is provided in the inner chamber  40  of the housing component. The gear reduction mechanism  2  is a planetary gear mechanism, which includes a planetary gear  21 , a planetary gear carrier  22  and an output gear carrier  26 . The planetary gear  21  is mounted on the planetary gear carrier  22 , the planetary gear  21  meshes with the input gear  112 , the input gear  112  is configured to drive the planetary gear  21  to rotate circumferentially, and the planetary gear  21  is configured to drive the output gear carrier  26  to rotate circumferentially. 
     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 substantially tubular and made by stretching a 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 another end of the valve body  31  by welding. The first valve seat  33  is fixed to a first connecting pipe  36  by welding, and the second valve seat  33 ′ is fixed to a second connecting pipe  37  by welding. One of the first connecting pipe  36  and the second connecting pipe  37  serves as a flow path inlet, and the other serves as a flow path outlet. The valve core  32  is substantially spherical, and is arranged in the inner chamber  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 portion  311  and an extending portion  312  extending outward from a circumferential outer wall of the body portion  311 , and the extending portion  312  is substantially tubular. In this embodiment, the output gear carrier  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 substantially cylindrical rod-shaped, the transmission shaft  34  penetrates through the extending portion  312 . One end of the transmission shaft  34  extends into the inner chamber  40  of the housing component and is connected to a hole portion  262  of the output gear carrier  26  by key-groove cooperation. The output gear carrier  26  is configured to drive the transmission shaft  34  to rotate circumferentially. Another end of the transmission shaft  34  extends into the inner chamber  30  of the valve body component and is connected to a groove  321  of the valve core  32  by key-groove cooperation. The transmission shaft  34  is configured to drive the valve core  32  to rotate circumferentially. 
     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 a stainless steel plate. A wall thickness of the lower housing  42  is larger than a wall thickness of the upper housing  41 . An upper end of the lower housing  42  includes a second stepped portion  421  with a stepped surface facing upward, the upper housing  41  is placed on the second stepped portion  421 , and the upper housing  41  is fixed to the lower housing  42  by welding. A lower end of the lower housing  42  includes a reduced-diameter portion  422 . at least part of the reduced-diameter portion  422  is located inside the extending portion  312  of the valve body  31 , and an outer wall of the reduced-diameter portion  422  is fixed to an inner wall of the extending portion  312  by welding. 
     In this embodiment, the valve body  31  is fixedly connected to the housing component  4 , and the motor  11  is arranged in the inner chamber  40  of the housing component. The beneficial effect is that the influence of moisture on the motor  11  can be reduced, and the risk of short-circuit of the motor  11  can be reduced. 
     Further, as shown in  FIG. 2 , in this embodiment, the rotating shaft  111  is fixedly connected to the input gear  112 , and a circumferential outer wall of the input gear  112  includes a sun gear  1120 . The gear reduction mechanism  2  further includes a gear ring  25  and a partition plate  24 , and the gear ring  25  is fixedly connected to the partition plate  24  by welding. Apparently, the gear ring  25  may be connected to the partition plate  24  by circumferentially limiting, as long as the partition plate  24  does not rotate circumferentially relative to the gear ring  25 . The partition plate  24  includes a center hole  241 , at least part of the lower bearing  116  is located in the center hole  241 , and the lower bearing  116  is in clearance fit with the center hole  241 . With this arrangement, the motor  11  can be positioned. In the specific assembly, after the motor  11  is positioned, the mounting plate  13  is welded to an inner wall of the lower housing  42  for fixation. The gear ring  25  is substantially cylindrical, the sun gear  1120  is located in an inner chamber  250  of the gear ring  25 , the planetary gear  21  is located in the inner chamber  250  of the gear ring  25 , and the sun gear  1120  meshes with the planetary gear  21 . 
     As shown in  FIGS. 2 and 4   a , the mounting plate  13  is placed on the partition plate  24 , and the mounting plate  13  includes a gap  130  located on an outer circumference of the mounting plate  13 . The inner chamber  40  of the housing. component includes an upper chamber  401  located above the mounting plate  13  and the inner chamber  250  of the gear ring, and the upper chamber  401  is in communication with the gap  130 . The stator  113  and the rotor  114  are located in the upper chamber  401 . The partition plate  24  includes a communication flow path  240  which communicates the gap  130  with the inner chamber  250  of the gear ring. The communication flow path  240  includes a through hole  242  axially penetrating through the partition plate  24  and a radial through groove  243  radially extending from the through hole  242  to a circumferential outer wall of the partition plate  24 . By providing the communication flow path  240  and the gap  130 , the upper chamber  401  is communicated with the inner chamber  250  of the gear ring, and fluid in the electric valve is introduced into the upper chamber  401 , which is beneficial to the heat dissipation of the motor  11 , and the upper chamber  401  may not form a liquid-sealing chamber, which improves the safety of the electric valve. 
     Further, as shown in  FIG. 4 a   , the communication flow path  240  further includes an annular groove  244 , at least two through holes  242  are defined and are arranged symmetrically about the center hole  241 , and the annular groove  244  communicates with each of the through holes  242 . With this arrangement, the flow capacity of the communication flow path  240  is improved. 
     The planetary gear carrier  22  includes a first-stage planetary gear carrier  221 , the first-stage planetary gear carrier  221  includes a center through hole  2210 , and a lower end of the rotating shaft  111  is located in the center through hole  2210 . The gear reduction mechanism  2  further includes a positioning rod  23 , which is processed by turning a metal bar. An upper end of the transmission shaft  34  includes a blind hole  343 , an upper end of the positioning rod  23  is located in the center through hole  2210 , and a lower end of the positioning rod  23  is located in the blind hole  343 . With this arrangement, the planetary gear carrier  22  can be positioned, the operation stability of the gear reduction mechanism  2  can be improved, and the risking of getting stuck can be reduced. 
       FIG. 10 a    is a schematic partial sectional view of a second electric valve according to the present application;  FIG. 10 b    is a schematic view showing the cooperation of a rotating shaft, a transmission rod, and an input gear in  FIG. 10   a.    
     The difference between this embodiment and the above-mentioned embodiments lies in the structure of the control component and the connection relationship between the control component and the gear reduction mechanism. 
     As shown in  FIGS. 10 a    and  10   b,  the motor  11 ′ includes a rotating shaft  111 ′ and a transmission rod  117  fixedly connected to the rotating shaft  111 ′, the transmission rod  117  is substantially plate-shaped and includes a side wall portion  1171 . An input gear  112 ′ includes a large-diameter portion  1121  and a small-diameter portion  1122 . A groove  1123  is defined at an upper end of the large-diameter portion  1121 , at least part of the transmission rod  117  is located in the groove  1123 , the groove  1123  includes a groove wall portion  1124  configured to abut against the side wall portion  1171 , and a circumferential movement gap is present between the groove wall portion  1124  and the side wall portion  1171 . A circumferential outer wall of the small-diameter portion  1122  includes a sun gear  1120 ′, at least part of the sun gear  1120 ′ is located in the inner chamber  250  of the gear ring, the sun gear  1120 ′ meshes with the planetary gear  21 , and the small-diameter portion  1122  penetrates through the center hole  241  of the partition plate  24 . 
     Further, as shown in  FIG. 10 a   , a protruding ring  1125  is provided at a lower end of the large-diameter portion  1121 , a longitudinal sectional profile of the lower end of the protruding ring  1125  is substantially arc-shaped, and the protruding ring  1125  abuts against the partition plate  24 . By providing the protruding ring  1125 , it is beneficial to reducing the frictional force when the input gear  112 ′ rotates circumferentially, and prolonging the service life of the input gear  112 ′. 
     Further, as shown in  FIGS. 2 and 3 , the electric valve further includes a plug-in component  5 , and the plug-in component  5  includes a plug-in socket  51 , a sealing glass  52  and a pin  53 . The sealing glass  52  is fixed in the plug-in socket  51  by sintering. Specifically, the plug-in socket  51  is made of stainless steel and has a substantially hollow structure, which includes an upper portion  511 , a middle portion  512  and a lower portion  513 . The upper portion  511  includes a plug-in chamber  5110 , the lower portion  513  includes a sealing chamber  5130 , the sealing chamber  5130  is in communication with the inner chamber  40  of the housing component, and the middle portion  512  is fixed and sealed to the sealing glass  52  by sintering, which separates the plug-in chamber  5110  from the sealing chamber  5130 . The pin  53  penetrates through the sealing glass  52 . An upper end of the pin  53  extends into the plug-in chamber  5110  and is configured to electrically connect with an external plug-in component, and a lower end of the pin  53  extends into the sealing chamber  5130  and is configured to electrically connect with the lead wire  12  of the control component  1 . The pin  53  is fixed to the sealing glass  52  by sintering. 
     Further, the upper housing  41  includes a protruding portion  411  protruding upward. A lower end of the plug-in socket  51  includes a first stepped portion  514  with a stepped surface facing downward, and the protruding portion  411  is fixed to the first stepped portion  514  by welding. 
     As shown in  FIG. 2 , the transmission shaft  34  penetrates through the reduced-diameter portion  422  of the lower housing  42 , and a bearing member  27  is provided between the reduced-diameter portion  422  and the transmission shaft  34 . The second bearing member  27  is made by wear-resistant metal material powder metallurgy. The beneficial effect of this arrangement lies in that the wear of the transmission shaft  34  during the circumferential rotation is reduced and the service life of the transmission shaft  34  is prolonged. 
     It is conceivable that the method of fixing the lower housing  42  to the valve body  31  may be fixing an inner wall of the reduced-diameter portion  422  to an outer wall of the extending portion  312  of the valve body  31  by welding. The transmission shaft  34  penetrates through the extending portion  312 , and a bearing member  27  is provided between extending portion  312  and the transmission shaft  34 . This embodiment has the same technical effect as the above embodiment. 
     With reference to  FIG. 2 ,  FIG. 5 , and  FIG. 7 , one end of the transmission shaft  34  facing the control component  1  includes a first key portion  341  which is connected to the hole portion  262  of the output gear carrier  26  by key-groove cooperation, and the first key portion  341  is located in the inner chamber  40  of the housing component. The first key portion  341  has a non-circular cross section and extends into the hole portion  262  of the output gear carrier  26 . Another end of the transmission shaft  34  includes a second key portion  342  which is connected to the valve core  32  by key-groove cooperation, and the second key portion  342  is located in the inner chamber  30  of the valve body component. A lower end of the second key portion  342  extends into the groove  321  of the valve core  32 , and the second key portion  342  is in key-groove fit with the valve core  32 . 
     As shown in  FIG. 4 b   ,  FIG. 5 ,  FIG. 6  and  FIG. 7 , in this embodiment, a limiting groove  251  is provided at a lower end of the gear ring  25 . The output gear carrier  26  includes a disc-shaped body portion  261 . A hole portion  262  is provided in the disc-shaped body portion  261 , and the cross section of the hole portion  262  is non-circular. A protruding portion  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 radially extending portion  272  extending radially outward from a circumferential outer wall of the cylindrical portion  271 , the cylindrical portion  271  includes an axial through groove  274 , and the axial through groove  274  communicates the inner chamber  40  of the housing component with the inner chamber  30  of the valve body component An outer edge of the radially extending portion  272  is fixed to the inner wall of the lower housing  42  by welding, one end of the radially extending portion  272  away from the cylindrical portion  271  is in key-groove fit with the limiting groove  251 , and another end of the radially extending portion  272  is in cooperation with the protruding portion  263  to limit a circumferential rotation stroke of the output gear carrier  26 . 
     In the above embodiment, since the radially extending portion  272  of the bearing member  27  is fixed to the lower housing  42  by welding, on the one hand, the gear ring  25  is circumferentially limited due to the key-groove fit between the radially extending portion  272  and the limiting groove  251  of the gear ring  25 , and on the other hand, the protruding portion  263  is limited by the radially extending portion  272 , thus limiting the circumferential rotation stroke of the output gear carrier  26 , that is, limiting a circumferential rotation stroke of the transmission shaft  34 . This arrangement can limit the fully open position and the fully closed position of the valve core  32 , and realize the fully open, fully close and flow regulating functions of the electric valve. 
       FIG. 9  is a schematic structural view of another bearing member. 
     As shown in  FIG. 9 , a bearing member  27 A includes a cylindrical portion  271 A, a radially extending portion  272 A extending radially outward from a circumferential outer wall of the cylindrical portion  271 A, and an axially extending portion  273 A extending axially upward from the radially extending portion  272 A. The cylindrical portion  271 A includes an axial through groove  274 A, and the axial through groove  274 A communicates the inner chamber  40  of the housing component with the inner chamber  30  of the valve body component. An outer wall of the axially extending portion  273 A is fixed to the inner wall of the lower housing  42  by welding, the axially extending portion  273 A is located in the limiting groove  251  and is in key-groove fit with the limiting groove  251 , and the radially extending portion  272  cooperates with the protruding portion  263  to limit the circumferential rotation stroke of the output gear carrier  26 . 
     Further, as shown in  FIG. 5 , two protruding portions  263  are provided, and the two protruding portions are arranged symmetrically relative to the central axis of the hole portion  262 . Such arrangement is beneficial to smooth rotation and reliable positioning of the output gear carrier in the circumferential direction. In addition, the protruding portions  263  and the disc-shaped body portion  261  are integrally formed by plastic injection molding or metal powder metallurgy, which is beneficial to enhancing the strength of the output gear carrier and making the limiting more reliable. 
       FIG. 11  is a schematic partial sectional view of a third electric valve according to the present application;  FIG. 12  is a schematic structural view of the valve body in  FIG. 11 ; and  FIG. 13  is a schematic structural view of the bearing member in  FIG. 11 . 
     The difference between this embodiment and the above-mentioned embodiments lies in the structure and the stopping method of the valve body component and the bearing member. 
     As shown in  FIGS. 10 to 12 , in this embodiment, the valve body component  3 A includes a valve body  31 A, a transmission shaft  34 , a first valve seat  33 A, and a valve core  32 . The valve body  31 A is made of metal material by forging or casting, and the first valve seat  33 A is made of metal material by turning, forging or casting. The valve body  31 A includes a substantially cylindrical body portion  311 A and a protruding portion  312 A extending from an outer wall of the body portion  311 A toward the control component  1 . The protruding portion  312 A is provided with an axial through hole  3120 A, the cross section of the axial through hole  3120 A is circular, and the transmission shaft  34  penetrates through the axial through hole  3120 A. In this embodiment, an inner wall of the reduced-diameter portion  422  of the lower housing  42  is fixed to an outer wall of the extending portion  312 A by welding, a bearing member  27 B is provided between the extending portion  312 A and the transmission shaft  34 , the bearing member  27 B is formed by bending a metal sheet, and the bearing member  27 B has a notch portion  275  which communicates the inner chamber  40  of the housing component with the inner chamber  30  of the valve body component. 
     In this embodiment, an upper end of the extending portion  312 A includes a limiting boss  313 , and two limiting bosses  313  are provided and are arranged symmetrically relative to a center axis of the axial through hole  3120 A. A recess portion  314  is formed between the two limiting bosses  313 , the recess portion  314  is located in a circumferential space between the two limiting bosses  313 , the protruding portion  263  of the output gear carrier  26  is placed in the recess portion  314 , and the protruding portion  263  is configured to abut against the limiting bosses  313  to limit the circumferential rotation stroke of the output gear carrier  26 . In this embodiment, the limiting bosses  313  are integrated with the valve body  31 A, no special machining for the bearing member is required, and the bearing member is easy to process. 
     The principle and the embodiments of the present application are illustrated herein by specific examples. The above description of examples is only intended to facilitate the understanding of the method and spirit of the present application. It should be noted that, for those skilled in the art, many modifications and improvements may be made to the present disclosure without departing from the principle of the present disclosure, and these modifications and improvements are also deemed to fall into the protection scope of the present disclosure defined by the claims.