An electric control valve

Abstract

The present invention discloses an electric control valve, wherein a seat body comprises a bearing mounting hole, a first bearing is placed in the bearing mounting hole, the seat body, a bearing outer ring of the first bearing, and the connecting piece are limitedly connected, the bearing inner ring of the first bearing is located between the output gear and the connecting piece, the bearing inner ring of the first bearing is sleeved with the transmission threaded component, the bearing inner ring is fixedly connected with the transmission threaded component, the electric control valve further comprises a positioner, the positioner is placed in the first valve body, the positioner is fixedly connected with the first valve body, the valve core component comprises a valve core, the positioner cooperates with the valve core to limit the rotation of the valve core, the valve core is threadedly connected with the transmission threaded component, the valve core can move axially relative to the transmission threaded component, the connecting piece comprises a first limiting portion and a second limiting portion, the valve core can abut against the first limiting portion, and the second limiting portion can abut against the seat body, so as to avoid failure or poor performance of the first bearing due to deformation of the bearing outer ring under stress.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, in particular to an electric control valve. Background Art

[0002] Figure 1A The figure shows a partial structural diagram of an electric control valve of the background technology. Figure 1B Shown Figure 1A The middle part of the structure is shown in cross-section. The electric control valve includes a screw 01, an output gear 03, a bearing 02, a plastic gear seat 04, a valve core component 05 and a valve body 06. The screw 01 can rotate in the circumferential direction, the valve core component 05 is threadedly connected to the screw 01, the valve core component 05 can move axially relative to the valve body 06 driven by the screw 01, and the disc 051 of the valve core component 05 can cooperate with the lower end of the valve body 06 to stop the axial movement of the valve core component 05. In the electric control valve, the bearing 02 is fixed to the plastic gear seat 04 by injection molding, and the valve core component 05 cooperates with the lower end of the valve body 06 to achieve the upper stop of the valve core component 05. Summary of the invention

[0003] The present application provides an electric control valve, including a valve body assembly, a motor assembly, a transmission assembly, a support seat assembly, and a valve core component. The motor assembly is fixedly connected to the support seat assembly, the support seat assembly is fixedly connected to the valve body assembly, the support seat assembly includes a seat body, a first bearing and a connecting piece, the transmission assembly includes an output gear and a transmission threaded component, the output gear is fixedly connected to the transmission threaded component, the seat body includes a bearing mounting hole, the first bearing is placed in the bearing mounting hole, the seat body, the bearing outer ring of the first bearing, and the connecting piece are limitedly connected, the bearing inner ring of the first bearing is located between the output gear and the connecting piece, and the bearing inner ring of the first bearing The ring is sleeved with the transmission threaded component, the bearing inner ring is fixedly connected to the transmission threaded component, the electric control valve also includes a positioner, the positioner is placed in the first valve body, the positioner is fixedly connected to the first valve body, the valve core component includes a valve core, the positioner cooperates with the valve core to limit the rotation of the valve core, the valve core is threadedly connected to the transmission threaded component, the valve core can move axially relative to the transmission threaded component, the connecting piece includes a first limiting portion and a second limiting portion, the valve core can abut against the first limiting portion, and the second limiting portion can abut against the seat body, so as to avoid the first bearing failure or poor performance due to the deformation of the outer ring of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Figure 1A Shown is a partial structural schematic diagram of an electric control valve of the background technology;

[0005] Figure 1BShown Figure 1A The middle part of the structure is shown in cross section;

[0006] Figure 2 The figure shows a structural schematic diagram of a specific embodiment of the electric control valve of the present invention;

[0007] Figure 3A Shown Figure 2 A local enlarged schematic diagram of I2 in the middle;

[0008] Figure 3B Shown Figure 2 A schematic structural diagram of the middle glass seat assembly 2;

[0009] Figure 3C Shown Figure 2 Detailed cross-sectional view at I1 in the middle;

[0010] Figure 4 Shown Figure 2 A three-dimensional diagram of the middle positioner;

[0011] Figure 5 Shown Figure 2 Schematic diagram of some structures of the motor;

[0012] Figure 6 Shown Figure 2 A schematic diagram of the structure of the middle and lower fixing components;

[0013] Fig. 7A Shown Figure 2 A perspective view of the motor assembly;

[0014] Figure 7B Shown Figure 2 A three-dimensional image of the motor assembly from another perspective;

[0015] Figure 8 Shown Figure 2 A top view of the middle seat body;

[0016] Fig. 9 Shown Figure 2 A three-dimensional view of the middle seat body at one angle;

[0017] Fig.10 Shown Figure 2 a cross-sectional view of the transmission threaded member;

[0018] Fig.11 Shown Figure 2 A three-dimensional diagram of the output gear;

[0019] Fig.12 Shown Figure 2 A three-dimensional view of the middle valve core;

[0020] Fig.13The figure shows the structure schematic diagram of the specific embodiment 2 of the electric control valve of the present invention;

[0021] Fig.14 Shown Fig.13 A local enlarged schematic diagram of I3 in the middle;

[0022] Fig.15 Shown Fig.13 Schematic diagram of the structure of the transmission screw part. DETAILED DESCRIPTION

[0023] It should be noted that if directional words, such as "above" and "below", are used in this article, they are defined based on the illustrated positions in the drawings of this specification. It should be understood that the use of the directional words is only for the clarity and convenience of describing the technical solution and should not constitute a limitation on the scope of protection.

[0024] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figure 2 As shown, the electric control valve includes a lead assembly 1, a glass seat assembly 2, a fixing nut 3, a valve body assembly 4, a motor assembly 5, a support seat assembly 6, a transmission assembly 7 and a valve core component 8.

[0026] The valve body assembly 4 and the glass seat assembly 2 are fixedly connected to form a valve cavity 10 , and the support seat assembly 6 , the transmission assembly 7 and the valve core component 8 are built in the valve cavity 10 .

[0027] like Figure 2 and Figure 3A As shown, the valve body assembly 4 includes a second valve body 41 and a first valve body 42 welded and fixed to the second valve body 41, and a positioner 43 built into the first valve body 42. The second valve body 41 is cylindrical and made of stainless steel, and its outer diameter is roughly equal. The second valve body 41 includes a main body 411 and a lower support part 412, and the lower support part 412 extends radially toward the central axis direction of the second valve body 41 relative to the inner wall of the main body 411, and the inner diameter of the lower support part 412 is smaller than the inner diameter of the main body 411. The main body 411 and the lower support part 412 are basically arranged vertically.

[0028] The first valve body 42 includes an upper positioning portion 423, which includes a first portion 4231 and a second portion 4232. The first portion 4231 and the second portion 4232 are annular, and the outer diameter of the second portion 4232 is smaller than the outer diameter of the first portion 4231. The second portion 4232 is located at the lower side of the first portion 4231. The outer wall of the first portion 4231 is opposite to the inner wall of the body portion 411, and the outer wall of the second portion 4232 is opposite to the inner wall of the lower support portion 412. Figure 3A , Figure 3B , Figure 3C As shown, the upper positioning portion 423 further includes a third portion 4233 on the upper side of the first portion 4231, the outer wall of the third portion 4233 is arranged opposite to the inner wall of the body portion 411, and the outer diameter of the third portion 4233 is smaller than the outer diameter of the first portion 4231. The third portion 4233, the first portion 4231 and the inner wall of the body portion of the second valve body 41 form an annular accommodation space C, and the annular accommodation space C is used to place solder to weld the second valve body 41 and the first valve body 42 to fix the two.

[0029] The first valve body 42 has a circular inner convex portion 421 extending toward the central axis of the first valve body 42, and the inner convex portion 421 forms a valve port 4210. The first valve body 42 includes a first interface end A and a second interface end B, and the first interface end A and the second interface end B are connected or disconnected by the cooperation between the valve core component 8 and the valve port 4210.

[0030] like Figure 2 , Figure 3A and Figure 4 As shown, the stopper 43 is in the shape of an open cylinder, and is made by stamping a metal plate or by metal powder metallurgy, and includes a cylinder 431 and an annular fixing portion 432, wherein the cross-sectional profiles of the inner wall and the outer wall of the cylinder 431 are roughly square, and the cylinder 431 includes two groups of four flat plate portions 4311 arranged opposite to each other, and arc-shaped transition portions 4312 are respectively included between adjacent flat plate portions 4311. The inner wall of the first valve body 42 includes a first positioning step portion 422 with the step surface facing upward, and the fixing portion 432 of the stopper 43 is located on the first positioning step portion 422 and is fixed to the first positioning step portion 422 by furnace welding. Specifically, before the positioner 43 is welded and fixed to the first positioning step 422, the positioner 43 can be pressed into the first valve body 42 by press-fitting, so that the fixing portion 432 is seated on the first positioning step 422, and the transition portion 4312 of the positioner 43 is matched with the inner wall of the first valve body 42, so that the positioner 43 and the first valve body 42 are pre-positioned to facilitate welding therebetween.

[0031] like Figure 2 and Figure 5-7AAs shown, the motor assembly 5 is built into the valve cavity 10, and the motor assembly 5 is electrically connected to the glass seat assembly 2. Specifically, the motor assembly 5 includes a housing component 51, an upper fixing component, a lower fixing component, a rotor component, an input gear 57 fixedly connected to the rotor component, and more than three motor leads 58, each of which is connected to a terminal 581. The rotor component includes a rotor 52 and a rotating shaft 53 fixedly connected to the rotor 52. The upper fixing component is fixedly connected to the upper end of the housing component 51, and the lower fixing component is fixedly connected to the lower end of the housing component 51. The rotating shaft 53 is fixed to the rotor 52 by injection molding, and both ends of the rotating shaft 53 extend out of the rotor 52. The upper fixing component, the lower fixing component and the housing component 51 together form a motor cavity, and the magnetic conductor of the motor is arranged in the motor cavity.

[0032] The upper fixing assembly includes an upper fixing member 54 and an upper bearing 55. The upper fixing member 54 and the shell component 51 are made of metal materials. The upper fixing member 54 is plate-shaped. The upper fixing member 54 and the shell component 51 are fixed by riveting or welding. The upper fixing member 54 is sleeved on the upper bearing 55, and the upper bearing 55 passes through the upper fixing member 54. In this embodiment, the upper bearing 55 is a copper-based bearing. After the upper bearing 55 and the upper fixing member 54 are sleeved, the two are riveted and fixed to the upper fixing member 54 by squeezing one end of the upper bearing 55. The inner wall of the upper bearing 55 and the outer wall of the rotating shaft 53 are clearance-matched. The upper bearing 55 is used to reduce the wear of the upper end of the rotating shaft 53.

[0033] The lower fixing assembly includes a lower fixing member 50 and a stopper 56 fixedly connected to the lower fixing member 50. The lower fixing member 50 and the stopper 56 are made of metal plates and are plate-shaped. The lower fixing member 50 and the shell member 51 are fixed by spot welding or riveting. The upper fixing member 54 and the shell member 51 can be fixed in the same way. The lower fixing member 50 and the stopper 56 are fixed by welding or riveting.

[0034] like Figure 5-7A As shown, the rotor 52 includes a first sleeve portion 522 and a second sleeve portion 523, and the rotor 52 includes a circular receiving groove 521 with an opening toward the valve port 4210. The first sleeve portion 522 and the second sleeve portion 523 are both cylindrical, and the outer diameter of the first sleeve portion 522 is greater than the outer diameter of the second sleeve portion 523. The outer walls of the first sleeve portion 522 and the second sleeve portion 523 are also the walls of the receiving groove 521.

[0035] The lower fixing member 50 includes an annular support portion 501, a cylindrical portion 502 and an annular flange portion 503. In terms of shape, the flange portion 503 radially extends from one end of the cylindrical portion 502 toward the direction close to the rotating shaft 53, and the support portion 501 radially extends from the other end of the cylindrical portion 502 toward the direction away from the rotating shaft 53. The flange portion 503 and the cylindrical portion 502 are located in the receiving groove 521, and the flange portion 503 is sleeved on the outer periphery of the first sleeve portion 522 and is clearance-matched with the first sleeve portion 522.

[0036] The first sleeve portion 522 and the second sleeve portion 523 together form a step surface 520. The lower fixed component also includes a second bearing 59, which is sleeved on the second sleeve portion 523. The second bearing 59 is located in the accommodating groove 521 and between the second sleeve portion 523 of the rotor 52 and the cylindrical portion 502 of the lower fixed component 50.

[0037] like Figure 5 As shown, the second bearing 59 is specifically a ball bearing, which includes a bearing inner ring 591, a bearing outer ring 592, and a ball 593 located between the bearing inner ring 591 and the bearing outer ring 592. The bearing inner ring 591 is fixedly connected to the outer wall of the second sleeve portion 523, such as a transition or interference fit, so that the bearing inner ring 591 can rotate together with the rotor component. The bearing outer ring 592 does not contact the rotor 52, and the bearing outer ring 592 is axially limited between the flange-shaped portion 503 of the lower fixing member 50 and the limiting member 56. The limiting member 56 can limit the second bearing 59 in the axial direction to prevent the second bearing 59 from being separated from the rotor 52.

[0038] Furthermore, the upper and lower ends of the bearing outer ring 592 can respectively abut against the flanged portion 503 of the lower fixing member 50 and the stopper 56. In this embodiment, the lower fixing member 50, the stopper 56 and the rotor 52 provide an installation space for the second bearing 59. The rotor 52 and the rotating shaft 53 are fixed by injection molding, and the second bearing 59 is provided. When the rotor 52 rotates, the rotor 52 and the rotating shaft 53 rotate together, and the rotor 52 rotates synchronously with the bearing inner ring 591, while the bearing outer ring 592 does not rotate. The rotor 52 and the rotating shaft 53 do not rotate relative to each other, and the rotating shaft 53 is not rubbed by the second bearing 59. The rotational friction only occurs between the ball 593 and the bearing inner ring 591 and the ball 593 and the bearing outer ring 592, which can improve the noise of the electric control valve and improve the operating life of the rotating shaft 53.

[0039] In this embodiment, the support portion 501 of the lower fixing member 50 is in the shape of a flat plate, and the lower fixing member 50 further includes a plurality of fixing ribs 504 protruding from the lower surface of the support portion 501 and arranged at intervals. Figure 5In the illustrated embodiment, in this embodiment, specifically, the stopper 56 is substantially in the shape of a flat plate, and includes a plurality of positioning holes 561 arranged at intervals, the number of the positioning holes 561 corresponds to the fixing ribs 504 of the lower fixing member 50, each fixing rib 504 is at least partially inserted into each positioning hole 561, and the stopper 56 is fixedly connected to the lower fixing member 50 by extruding and riveting each fixing rib 504. The number of the fixing ribs 504 and the positioning holes 561 is at least two, respectively, so that the lower fixing member 50 and the stopper 56 are reliably fixed. In this embodiment, the number of the fixing ribs 504 and the positioning holes 561 is three, respectively, which is equivalent to three-point positioning and is more stable.

[0040] like Figure 2 As shown, the lower fixing member 50 of the motor assembly 5 is seated on the support seat assembly 6. The support seat assembly 6 includes a seat body 61. Figure 8 Shown Figure 2 A top view of the middle seat body 61, Fig. 9 Shown Figure 2 A three-dimensional diagram of the middle seat. Figure 3A and Figure 8 , Fig. 9 As shown, the seat body 61 is made of brass material, and the seat body 61 is cylindrical, and includes a mounting cylinder 611 and a connecting portion 612, wherein the mounting cylinder 611 includes an annular wall portion 6111 and a bottom portion 6112, and the outer wall of the wall portion 6111 is arranged in a polygonal shape, which is convenient for the operation when the seat body 61 and the first valve body 42 are installed. The inner wall of the wall portion 6111 is circular. The bottom portion 6112 is generally arranged vertically with the wall portion 6111, and the bottom portion 6112 is connected with the connecting portion 612. The wall portion 6111 includes an opening portion 6110 facing the housing component 51 of the motor assembly 5, and the opening portion 6110 includes a supporting surface 6113 facing the housing component 51. The lower fixing member 50 of the motor assembly 5 overlaps with the supporting surface 6113, so that the seat body 61 supports the motor assembly 5, and the opening portion 6110 of the seat body 61 is fixed by riveting or welding to the outer edge of the lower fixing member 50.

[0041] like Figure 2 , 3A -3B, the outer wall of the connecting portion 612 has an external thread, the first valve body 42 has an internal thread, the seat body 61 and the first valve body 42 are fixed by the matching thread connection of the external thread and the internal thread. During the connection between the two, the outer wall of the wall portion 6111 of the mounting cylinder portion 611 of the seat body 61 serves as an operating portion to facilitate the operation of the installation tool.

[0042] The support seat assembly 6 includes a seat body cavity 60. The transmission assembly 7 includes a gear set and a transmission threaded component. Among them, the gear set includes a transmission gear 71, an output gear 72, and a gear positioning shaft 73. The transmission gear 71, the output gear 72 and the input gear 57 are located in the seat body cavity 60.

[0043] like Figure 3A , Fig. 7A and Figure 8-9 As shown, the lower fixing member 50 of the motor assembly 5 includes a first insertion portion 505. In this embodiment, the first insertion portion 505 is an axial through hole. The connecting portion 612 of the seat body 61 includes a blind hole 6121. After one end of the gear positioning shaft 73 is inserted into the first insertion portion 505, it can be in contact with or not in contact with the lower end of the rotor 52. The other end of the gear positioning shaft 73 is inserted into the blind hole 6121 and is press-fitted with the connecting portion 612. The connecting portion 612 of the seat body 61 also includes a first axial through hole 6122 spaced apart from the blind hole 6121. The seat body 61 and the first valve body 42 include a lower cavity 420. The first axial through hole 6122 connects the lower cavity 420 with the seat body cavity 60. Furthermore, a second through hole 6116 is provided on the side wall of the mounting cylinder portion 611 of the seat body 61. The second through hole 6116 connects the seat body cavity 60 and the annular space E between the seat body 61 and the second valve body 41. Furthermore, the lower fixing member 50 has a third axial passage 507 , and the upper fixing member 54 has a fourth axial passage 541 . Figure 2 In the illustrated embodiment, the third axial channel 507 is a through hole provided on the support portion 501 and extending axially through the lower fixing member 50, and the fourth axial channel 541 is a through hole extending axially through the upper fixing member 54. It should be noted here that the shapes of the third axial channel 507 and the fourth axial channel 541 are not limited to circular through holes, and the first axial through hole 6112, the second through hole 6116, the third axial channel 507 and the fourth axial channel 541 are all used to act as pressure balancing channels. The specific shapes of the third axial channel 507 and the fourth axial channel 541 are not limited to through hole forms, as long as they can achieve their purpose, and the number of the first axial through hole 6112, the second through hole 6116, the third axial channel 507 and the fourth axial channel 541 is not limited, and can be set to 1 or more than 2.

[0044] The transmission gear 71 is sleeved on the gear positioning shaft 73, and the output gear 72 and the input gear 57 are respectively meshed with the transmission gear 71. Through the cooperation between the gear positioning shaft 73 and the seat body 61 of the motor assembly 5, and then through the cooperation between the transmission gear 71 and the gear positioning shaft 73, the positions of the gear set, the motor assembly 5 and the support seat assembly 6 are relatively fixed.

[0045] like Figure 2 and Figure 3B and Fig. 7A , Figure 8As shown, the upper end of the opening portion 6110 of the seat body 61 also includes a second circumferential positioning portion 6114, and the lower fixing member 50 also includes a third circumferential positioning portion 506. Specifically, the second circumferential positioning portion 6114 is a groove, and the third circumferential positioning portion 506 is a notch located at the outer edge of the lower fixing member 50. The motor positioning shaft 9 is partially located in the third circumferential positioning portion 506, and partially located in the second circumferential positioning portion 6114. The motor positioning shaft 9 cooperates with the second circumferential positioning portion 6114 and the third circumferential positioning portion 506 to limit the motor assembly 5 and the support seat assembly 6 relative to each other in the circumferential direction. In addition, the motor positioning shaft 9 and the gear positioning shaft 73 work together to further prevent the motor assembly 5 from rotating relative to the seat body 61 of the support seat assembly 6.

[0046] like Figure 2 and Figure 3A , Fig.10 and Fig.11 As shown, the output gear 71 is fixedly connected to the transmission threaded component, and the output gear 71 drives the transmission threaded component so that the transmission threaded component can rotate circumferentially relative to the valve body assembly 4. The transmission threaded component includes a transmission threaded member 74 and a support sleeve 75. The transmission threaded member 74 is made of a metal material, and in this embodiment, it is made of a stainless steel material. As shown in the figure, the transmission threaded member 74 includes a threaded portion 741, a radial protrusion 742, an output gear connecting portion 744, and a cylindrical portion 743 located between the output gear connecting portion 744 and the radial protrusion 742. The threaded portion 741 includes an external thread for threaded connection with the valve core component 8, and the inner wall of the output gear 72 is non-circular. In this embodiment, specifically, the outer wall of the output gear connecting portion 744 cooperates with the inner wall of the output gear 72. The output gear connecting portion 744 includes a notch portion 7441, and the inner wall of the output gear 72 includes a convex portion 721. After the output gear 72 is sleeved onto the output gear connecting portion 744, the notch portion 7441 is engaged with the convex portion 721, and the upper end of the output gear connecting portion 744 is turned outward and riveted to the output gear 72. Then, the output gear 72 can drive the transmission screw member 74 to rotate synchronously, and the transmission screw member 74 does not move axially.

[0047] like Figure 2 and Figure 3A As shown, the transmission screw 74 rotates with the gear set, and transmits the rotation output by the gear set to the axial movement of the valve core component 8, so that the valve core component 8 contacts or leaves the valve port 4210 to control the flow of the electric control valve. During the rotation of the transmission screw 74, the transmission reliability of the transmission screw 74 directly affects the performance of the electric control valve. If the transmission screw 74 is worn, there is a risk that the transmission screw 74 will get stuck. For this reason, Figure 2 and Figure 3AAs shown, the support seat assembly 6 also includes a first bearing 62, and the first bearing 62 includes a bearing inner ring 621, a bearing outer ring 622, and a ball 623 disposed between the bearing inner ring 621 and the bearing outer ring 622. The connecting portion 612 includes a bearing mounting hole 6123 and an annular first bearing stopper 6124. The first bearing 62 is located in the bearing mounting hole 6123. The hole wall of the first bearing stopper 6124 is clearance-matched with the outer wall of the output gear 72.

[0048] The transmission threaded component also includes a support sleeve 75 sleeved on the cylindrical portion 743 of the transmission threaded member 74, and the support sleeve 75 is fixedly connected to the transmission threaded member 74 by press fitting. The support sleeve 75 includes a collar portion 751 and a second bearing stop portion 752. The second bearing stop portion 752 radially extends outward relative to the collar portion 751, and the collar portion 751 cooperates with the bearing inner ring 621 of the first bearing 62, and the two ends of the bearing inner ring 621 are respectively abutted against the lower end of the output gear 712 and the second bearing stop portion 752 of the support sleeve 75. That is, the output gear 72 and the support sleeve 75 press the bearing inner ring 621 of the first bearing 62, so that the bearing inner ring 621 rotates with the transmission threaded member 74. One end of the bearing outer ring 622 of the first bearing 62 is arranged opposite to the first bearing stopper 6124 of the seat body 61, and the other end of the bearing outer ring 622 is in contact with or has a clearance fit with the connecting member 63 of the support seat assembly 6, and the bearing outer ring 622 is adapted to the hole wall of the bearing mounting hole 6123. Specifically, the bearing outer ring 622 and the hole wall of the bearing mounting hole 6123 can have an interference fit, or they can have a clearance fit, so that the transmission screw member 74 will not be subjected to rotational friction during rotation, thereby preventing the transmission screw member 74 from getting stuck. In this way, Figure 3AAs shown, one of the functions of the connecting member 63 is to support the first bearing 62 and indirectly support the output gear 72. The connecting member 63 is made of stainless steel. Specifically, the connecting member 63 is annular with a first step hole 630, and includes a second limit portion 631 and a first limit portion 632. The connecting portion 612 of the seat body 61 includes a connecting member limit portion 610. In this embodiment, the connecting member limit portion 610 is a downward step surface of the inner wall of the connecting portion 612. After the second limit portion 631 abuts against the connecting member limit portion 610, the lower end of the seat body 61 is riveted and pressed with the second limit portion 631, so that the connecting member 63, the seat body 61 and the first bearing 62 are limitedly connected (here, the limited connection means that the connecting member 63, the first bearing 62 and the seat body 61 do not separate, and the three can be fixedly connected or there can be appropriate displacement between the three). After the seat body 61 is connected to the connecting member 63, the connecting member 63 supports the outer ring 622 of the first bearing 62, the inner ring 621 of the bearing supports the output gear 72, and the output gear 72 is fixedly connected to the transmission screw member 74, and accordingly, the connecting member 63 is equivalent to supporting the transmission screw member 74. It should be noted here that the second limiting portion 631 and the connecting member limiting portion 610 may not abut during assembly, but the second limiting portion 631 abuts against the connecting member limiting portion 610 only after the valve core 81 abuts against the first limiting portion 631. The distance between the first bearing limiting portion 6124 and the step surface 610 as the connecting member limiting portion 610 is not less than the distance between the upper end surface of the bearing outer ring 622 and the lower end surface of the bearing outer ring 622. The purpose is that the main function of the connecting member 63 is to transmit the force of the valve core 81 to the seat body 61 after the valve core 81 abuts against the first limiting portion 631, but not to the first bearing 62, so as to prevent the first bearing 62 from failing or having poor performance due to the deformation of the bearing outer ring 622. For example, the deformation of the bearing outer ring 622 causes the ball 623 inside to get stuck, thus causing the first bearing 62 to fail. The distance between the first bearing limiting portion 6124 and the downward step surface of the inner wall of the connecting portion is equal to the distance between the upper end surface of the bearing outer ring 622 and the lower end surface of the bearing outer ring 622, or the distance between the first bearing limiting portion 6124 and the downward step surface of the inner wall of the connecting portion is at least 0.01 mm greater than the distance between the upper end surface of the bearing outer ring 622 and the lower end surface of the bearing outer ring 622.

[0049] The first limiting portion 632 is located at the lower side of the second bearing limiting portion 752 of the support sleeve 75, further preventing the transmission threaded component 74 from being separated from the seat body 61. There is a clearance fit between the inner wall of the first limiting portion 632 and the outer wall of the radial protrusion 742 of the transmission threaded component 74, so that the connecting member 63 does not interfere with the rotation of the transmission threaded component 74.

[0050] Figure 3AIn the structure shown, it should be noted that one of the reasons for the setting of the support sleeve 75 is that during the product standardization process, the outer diameter size of the cylindrical portion 743 of the transmission screw member 74 and the inner diameter size of the bearing inner ring 621 of the first bearing 62 are limited. Therefore, it can be understood that when the size of the transmission screw member 74 matches the size of the bearing inner ring 621 of the first bearing 62, it is also possible not to set the support sleeve 75.

[0051] like Figure 2 and Figure 3B , Figure 3C As shown, the glass seat assembly 2 includes a housing 21, a limiting sleeve 22, a glass seat 23, and a plurality of glass seat pins 24 arranged at intervals. Each glass seat pin 24 is sintered and fixed to the glass seat 23. Specifically, the glass seat 23 is formed in the housing 21 by sintering glass, and in this process, the glass seat pins 24 are also fixedly connected to the glass seat. The number of glass seat pins 24 is the same as the number of terminals 581 of the motor assembly 5. The housing 21 is made of stainless steel material, and the housing 21 includes a cover shell portion 211 and a connecting cylinder portion 212. The cover shell portion 211 is fixed to the second valve body 41 by laser welding.

[0052] like Figure 2 and Figure 7B As shown, the housing component 51 includes a lead-out portion 510, which is specifically an opening opened on the side wall of the motor housing 51. The motor lead wire extends from the lead-out portion 510 and is electrically connected to the glass base pin 24. There are more than three motor leads 58, each of which includes an insulating layer and a wire core, and the insulating layer wraps the wire core. In this embodiment, there are four motor leads 58, such as Figure 2 , Fig. 7A As shown, in this embodiment, since the shell 21 and the second valve body 41 are both made of metal, the two are fixed by laser welding. In order to avoid or reduce the thermal impact on the motor leads 58 of the motor component 5 when the two are welded, the electric control valve also includes an isolation sleeve 500. The isolation sleeve 500 is cylindrical and made of PTFE or a material with similar properties. The isolation sleeve 500 is sleeved on the outside of the shell component 51 and the upper fixed component. The lower end of the isolation sleeve 500 can be located on the mounting cylinder 611 of the lower fixing member 50 or the seat body 61. The lead-out portion 510 is located on the inner side of the isolation sleeve 500. As shown in FIG. Figure 2 and Fig. 7A , Figure 7BAs shown, in the axial direction of the valve body assembly 4, the projection of the welding part of the second valve body 41 and the shell 21 in the axial direction of the electric control valve is located between the upper end and the lower end of the shell component 21, and the isolation sleeve isolates the welding part from the motor lead, that is, the welding part is annular, and the cross section through the welding part is defined as XX, and the cross section XX intersects with the shell component 51. The isolation sleeve 500 is arranged between the motor lead 58 and the shell 21 and the motor lead 58 and the second valve body 41. The isolation sleeve 500 can improve the thermal impact on the motor lead 58 when the shell 21 and the second valve body 41 are welded, and prevent the insulation layer of the motor lead 58 from melting due to heat between the motor leads 58, causing the wire cores in the two insulation layers to overlap and short-circuit, thereby affecting the operation reliability of the electric control valve.

[0053] The outer wall of the connecting cylinder 212 has an external thread. When the shell 21 is used as a component, the connecting cylinder 212 is an axial through structure, and the glass seat 23 is formed by sintering and fixing glass in the inner cavity of the connecting cylinder 212. Each glass seat pin 24 is arranged at intervals and fixedly connected to the glass seat 23. The two ends of each glass seat pin 24 are located outside the glass seat 23, that is, extending from the glass seat 23. The limiting sleeve 22 is fixed in the connecting cylinder 212. The limiting sleeve 22 includes an isolation cavity corresponding to the number of terminals 581 of the motor assembly 5, and each terminal 581 is at least partially located in the isolation cavity, that is, a terminal 581 is provided in each isolation cavity. The lower end of each glass seat pin 24 is electrically connected to a terminal 581 respectively. The other end of each glass seat pin 24 is electrically connected to the lead assembly 1.

[0054] like Figure 2 and Figure 3A , Figure 3B , Figure 3C As shown, the lead assembly 1 includes a protective sleeve 11, an insulating sleeve 12, a connector 13, an encapsulating body 14, leads 15 corresponding to the number of glass seat pins 24 of the glass seat assembly 2, and connector pins 17 corresponding to the number of leads 15, which are at least partially located in the connector 13 and arranged at intervals. The connector pins 17 are fixedly connected to the connector 13 by injection molding. The number of connector pins 17 is more than 3.

[0055] The insulating sleeve 12 wraps each lead 15, and the connection end of each lead 15 is located outside the insulating sleeve 12. Among them, in this embodiment, four leads 15 and four connector pins 17 are included. One end of each connector pin 17 is soldered to the connection end of each corresponding lead 15, and the other end of each connector pin 17 does not extend out of the connector 12 to prevent damage before assembly with other parts. The connection part between each lead 15 and each connector pin 17 is wrapped by the encapsulation body 14, and the encapsulation body 14 is sealed and connected to the connector 13. The material of the encapsulation body 14 is polyethylene (PE), and the material of the connector 13 is polyhexamethylene adipamide (PA66). The encapsulation body 14 can prevent moisture and the like from contacting with the lead 15 or the connector pin 17, so as not to affect the reliability of the electrical connection between the lead 15 and the connector pin 17, thereby improving the operation reliability of the electric control valve.

[0056] like Figure 3C As shown, the connecting body 13 is substantially cylindrical, and includes a convex ring-shaped reinforcement portion 131 extending radially, a radial groove portion 132 provided on the outer wall of the connecting body 13, and an axial groove portion 133 located at the upper end of the connecting body 13, and the opening of the axial groove portion 133 faces upward. The groove of the axial groove portion 133 is partially filled by the protective sleeve 11.

[0057] The material of the protective cover 11 is polyvinyl chloride (PVC), and the protective cover 11 is connected with the insulating cover 12 and the connector 13 by injection molding. Figure 2 and Figure 3C As shown, one end of the protective cover 11 wraps one end of the insulating cover 12, and the other end of the protective cover 11 is located at the periphery of the connector 13 and wraps the reinforcement portion 131, that is, the protective cover 11 also wraps the area between the lower end of the insulating cover 12 and the reinforcement portion 131 of the connector 13. The protective cover 11 plays a secondary protection role for the lead 15 and the connector pin 17, preventing the fluid from corroding the lead 15 and the connector pin 17 and affecting the electrical connection reliability between the two.

[0058] During the molding process of the protective sleeve 11, the protective sleeve 11 is located outside the connector 13 and wraps the reinforcement portion 131, the radial groove portion 132, and the axial groove portion 133 of the connector 13. The arrangement of the reinforcement portion 131, the radial groove portion 132, and the axial groove portion 133 ensures good connection reliability between the protective sleeve 11 and the connector 13. It can be understood here that the reinforcement portion 131, the radial groove portion 132, and the axial groove portion 133 can all be arranged, or only one of them can be arranged. The arrangement of the reinforcement portion 131, the radial groove portion 132, and the axial groove portion 133 is not necessary for the implementation of the solution of the present application, but is beneficial to improving the reliability of product performance.

[0059] like Figure 3B and Figure 3CAs shown, the glass seat assembly 2 includes a housing 21 and a glass seat 23 formed by a housing 21 and a glass seat 23, and the housing 25 is located above the glass seat 23. The connector 13 of the lead assembly 1 includes an insertion portion 134 located at the lower side of the reinforcement portion 131, and the insertion portion 134 is placed in the housing 25. After the insertion portion 134 is inserted into the housing 25, each connector pin 17 of each lead assembly 1 is electrically connected to each glass seat pin 24 in the glass seat assembly 2. The number of the glass seat pins 24 is the same as the number of the connector pins 17, and the connection portion where the connector pins 17 and the glass seat pins 24 are electrically connected is located in the housing 25 area.

[0060] like Figure 2 and Figure 3B As shown, the upper end of the connecting barrel 212 of the housing 21 includes a sealing member accommodating portion, specifically, an annular sealing member accommodating groove 2121 with an opening facing upward. The sealing ring 26 is placed in the sealing member accommodating groove 2121. In this embodiment, the sealing member accommodating groove 2121 and the sealing ring 26 are both annular. During assembly, after the sealing ring 26 is placed in the sealing member accommodating groove 2121, the insertion portion 134 of the lead assembly 1 is inserted into the accommodating cavity 25, so that the connector pin 17 is electrically connected to the glass seat pin 24, and then, the protective cover 11 of the lead assembly 1 is detachably fixedly connected to the housing 21 with a fixing nut 3 with an internal thread, and the sealing ring 26 elastically abuts against the protective cover 11 and the connecting barrel 212.

[0061] Specifically, Figure 3C As shown, the fixing nut 3 includes an annular pressing portion 31 and a sleeve portion 32 arranged perpendicularly to the pressing portion 31, and the inner wall of the sleeve portion 32 includes an internal thread threadedly connected to the housing 21. The protective sleeve 11 of the lead assembly 1 includes a base 111 and an annular portion 112, the annular portion 112 is located at the lower side of the base 111, and the outer wall of the annular portion 112 is radially extended relative to the outer wall of the base 111. After the fixing nut 3 is sleeved with the protective sleeve 11 from the base 111, the pressing portion 31 is sleeved on the outer periphery of the base 111, and the sleeve portion 32 is threadedly connected to the connecting barrel 212 of the housing 21. At this time, the annular portion 112 of the protective sleeve 11 is located between the pressing portion 31 and the shell 21, and the sealing ring 26 abuts against the annular portion 112 and the connecting tube portion 212 of the shell 21 respectively, forming a soft seal between the lead assembly 1 and the glass seat assembly 2, preventing the fluid from penetrating from the pressing portion 31 of the fixing nut 3 and the base 111 of the protective sleeve 11, improving the reliability of the electrical connection between the connector pin 17 and the glass seat pin 24, thereby improving the operation reliability of the electric control valve.

[0062] like Figure 3CAs shown, the pressing portion 31 of the fixing nut 3 also includes a sealing rib 311. The sealing rib 311 is located at the lower end surface of the pressing portion 31 and is arranged in an annular shape. When the fixing nut 3 is connected to the protective cover 11 of the lead assembly 1 and the shell 21 of the glass seat assembly 2, the sealing rib 311 is pressed against the upper surface of the annular portion 112 of the protective cover 11. The beneficial effect of the sealing rib 311 is to form a hard seal, thereby improving the risk of fluid entering the electric control valve and contacting the connector pin 17 or the glass seat pin 42, thereby improving the operation reliability of the electric control valve. Moreover, when the electric control valve is used in marine applications, the sealing rib 311 can effectively prevent the fluid from entering from the inner wall of the pressing portion 31 and the outer wall of the protective cover 11 and accumulating between the fixing nut 3 and the shell 21 to cause salt spray corrosion to the shell 21.

[0063] like Figure 3C As shown, the protective sleeve 11 also includes a first circumferential positioning portion 113. In this embodiment, the first circumferential positioning portion is an axial protrusion. Specifically, the first positioning portion 113 is located at the lower side of the annular portion 112, and is extended from the lower surface of the annular portion 112 to the axial direction of the housing 21. The upper end of the connecting cylinder 212 of the housing 21 includes a second positioning portion 2122, which is a groove or a notch portion provided at the upper end of the housing 21. During the assembly process of the lead assembly 1 and the glass seat assembly 2, the first positioning portion 113 and the second positioning portion 2122 cooperate to define the corresponding relationship between each connector pin and each glass seat pin. The first positioning portion 113 is at least partially located in the second positioning portion 2122, so that the lead assembly 1 and the glass seat assembly 2 are relatively positioned in the circumferential direction, which is convenient for the assembly of each connector pin 17 of the lead assembly 1 and each glass seat pin 24 of the glass seat assembly 2, and plays a role in preventing wrong insertion.

[0064] like Figure 2 and Figure 3B As shown, in this embodiment, the seal receiving groove 2121 includes an inner wall portion 2123 and an outer wall portion 2124, and the second positioning portion 2122 is located on the outer side of the outer wall portion 2124 of the seal receiving groove 2121. After the fixing nut 3 is connected with the protective sleeve 11 and the housing 21, the annular portion 112 of the protective sleeve 11 abuts against the seal ring 26 and the inner wall portion 2123 and the outer wall portion 2124, or the annular portion 112 of the protective sleeve 11 abuts against the seal 26 and abuts against one of the inner wall portion 2123 and the outer wall portion 2124. Then, the inner wall portion 2123 and / or the outer wall portion 2124 limit the deformation of the seal ring 26, preventing the seal ring 26 from being excessively deformed and affecting the service life of the seal ring 26.

[0065] like Figure 2 and Figure 3CAs shown, the lead assembly 1 also includes a first thermoplastic tube 18, one end of which is sleeved outside the insulating sleeve 12, and the other end of the first thermoplastic tube 18 is sleeved outside the protective sleeve 11. In addition, a sealant is applied between the first thermoplastic tube 18 and the insulating sleeve 12 and between the first thermoplastic tube 18 and the protective sleeve 11. The first thermoplastic tube 18 is used to prevent external fluid from contacting the connector pin 17 in the lead assembly 1, causing the lead assembly 1 to fail. It should be noted that Figure 2 and Figure 3C The first thermoplastic tube 18 shown in the figure is in a molded shape. The first thermoplastic tube 18 is thermoplastically molded after being sleeved on the insulating sleeve 12 and the protective sleeve 11 .

[0066] like Figure 3A and Fig.12As shown, the valve core component 8 includes a valve core 81, the valve core 81 is made of plastic, the valve core is light in weight, and cooperates with the transmission screw made of metal material, the relative wear between the two is small, the friction resistance of the valve core 81 when the relative transmission screw 74 moves axially is reduced, the valve core 81 has good wear resistance, the action is smoother, and the action performance of the valve core 81 is improved. The valve core 81 is formed by injection molding, and the valve core 81 includes a guide portion 811 and a flow regulating portion 812. The shape of the outer wall of the guide portion 811 is adapted to the shape of the inner wall of the barrel portion 431 of the positioner 43. The guide portion 811 includes a matching plane portion 8111 and a matching transition portion 8112, the matching plane portion 8111 can be slidably matched with the plane portion 4311 of the positioner 43, the matching transition portion 8112 can be slidably matched with the transition portion 4312 of the positioner 43, and the flow regulating portion 812 can cooperate with the valve port 4210 to control the flow area. In the present embodiment, the valve core 81 is made of self-lubricating PEEK plastic. The valve core 81 has good wear resistance and is easy to process. It can process valve cores of complex shapes. Moreover, during the axial sliding of the valve core 81 relative to the retainer 43, the friction between the valve core 81 and the retainer 43 can be effectively improved. In the present embodiment, specifically, the outer wall of the valve core 81 is a quadrilateral structure adapted to the inner wall of the barrel 431 of the retainer 43, and the valve core 81 has a non-self-locking internal thread. The transmission threaded member 74 is made of metal, specifically stainless steel in the present embodiment. The threaded portion 741 of the transmission threaded member 74 has a non-self-locking external thread, and the valve core 81 is threadedly connected to the transmission threaded member 74. During the rotation of the transmission threaded member 74, the positioner 43 limits the circumferential rotation of the valve core 81, and the valve core 81 can move axially relative to the transmission threaded member 74. During the axial movement of the valve core 81 relative to the transmission threaded member 74, friction will be generated between the internal thread of the valve core 81 and the external thread of the transmission threaded member 74. Severe friction may cause the valve core 81 to be stuck. For this reason, the threaded portion 741 of the transmission threaded member 74 has a wear-resistant layer to increase the lubricity of the transmission threaded member 74. The material of the wear-resistant layer is DW-1605 anti-friction coating with a thickness of 0.01mm-0.02mm. When the transmission threaded member 74 cooperates with the valve core 81, the friction resistance is reduced, making the axial movement of the valve core 81 more flexible and reliable, and ensuring that the valve opening force of the electric control valve will not be attenuated due to friction resistance. In addition, the lubrication of the transmission threaded member 74 does not require the help of system refrigeration oil, so that the product can better adapt to oil-free or low-oil systems. In this embodiment, a wear-resistant layer is provided on the threaded portion 741 of the transmission threaded member 74 and on the outer surface between the threaded portion 741 and the radial protrusion 742 .

[0067] like Fig.12 and Figure 3AAs shown, the flow regulating portion 812 of the valve core 81 includes a first section 8122 and a second section 8121. The first section 8122 is streamlined with one end thin and the other end thick. In the axial direction of the valve core 81, the profile of the longitudinal section of the valve core 81 is curved. The second section 8121 is arranged between the guide portion 811 and the first section 8122. The second section 8121 is in a frustum shape. The diameter of one end of the second section 8121 connected to the first section 8122 is smaller than the diameter of the other end. During the axial movement of the valve core 81 with the transmission screw member 74, when the valve core 81 reaches the maximum stroke away from the valve port 4210, the valve core 81 abuts against the connecting member 63. That is, another function of the connecting member 63 is to limit the maximum stroke of the valve core 81. Specifically, when the upper end surface of the valve core 81 contacts the lower end surface of the first limiting portion 632 of the connecting member 63, the axial movement stroke of the valve core 81 from the valve port 4210 to the direction away from the valve port 4210 reaches the maximum value. Figure 3A As shown, in order to ensure the limiting effect of the connecting member 63 on the axial stroke of the valve core 81, when the valve core 81 abuts against the first limiting portion 632 of the connecting member 63, an axial gap is provided between the valve core 81 and the radial protrusion 742 of the transmission screw member 74, that is, it is further ensured that the valve core 81 is not in contact with the radial protrusion 742 to prevent the radial protrusion 742 from interfering with the valve core 81.

[0068] As mentioned above, the valve core 81 is stopped by setting a connecting piece 63 fixedly connected to the seat body 61, and the connecting piece 63 can prevent the first bearing 62 from axially disengaging. The seat body 61, the first bearing 62, and the connecting piece 63 are fixedly connected, and the valve core 81 can move axially relative to the transmission threaded component. The valve core 81 can abut against the connecting piece 63, that is, one connecting piece 63 is used to fix the first bearing 62 and to limit the axial stroke of the valve core 81. When the valve core 81 reaches the maximum stroke axially upward, it abuts against the first limit part 632, and the abutting force is borne by the connecting piece 63, rather than directly acting on the first bearing 62. The force is further transmitted to the seat body 61 through the connecting piece 63, and will not act on the first bearing 62, thereby avoiding the first bearing 62 from being compressed and causing the valve opening force to increase. Since the upper stop position is not set on the screw rod, it can effectively prevent the valve stem from being completely engaged with the screw rod thread and bitten when the upper stop is made, resulting in failure to open the valve normally.

[0069] like Fig.13 FIG. 1 is a schematic diagram of the structure of the second embodiment of the electric control valve of the present application. Fig.14 Shown Fig.13 A partial enlarged view of I2 in the middle. Fig.15 Shown Fig.14The main difference between the electric control valve shown in the second embodiment and the first embodiment is the difference between the transmission screw and the valve core. The same reference numerals are used for other parts that are the same as the first embodiment. The connection relationship between the parts and components not described in detail below in this embodiment is the same as that in the first embodiment and will not be repeated.

[0070] like Figure 13-15 As shown, the electric control valve includes a valve core 81A and a connecting member 63. The structure and reference numerals of the connecting member 63 refer to the relevant description in the first embodiment. The connecting member 63 includes a first step hole 630A, and the transmission threaded component includes a transmission threaded member 74A. The valve core 81A is formed by metal powder injection molding. The benefit of such processing is that the shape of the valve core 81A is easier to process, and the shape of the valve core is more flexible compared to the valve core made by metal turning and the like. Here, the metal powder injection uses a mold to injection mold a blank and quickly manufactures a high-density, high-precision, three-dimensional complex-shaped valve core through sintering. The valve core 81A includes a screw portion 811A, a guide portion 812A and a flow regulating portion 813A. The shape of the outer wall of the guide portion 812A is adapted to the shape of the inner wall of the barrel 431 of the positioner 43. The shape of the guide portion 812A is the same as the shape of the guide portion 811 in the first embodiment, and can be understood by reference. The guide portion 812A includes a matching plane portion 8121A. In the axial direction of the first valve body 42, the matching plane portion 8121A can slide with the plane portion 4311 of the stopper 43, and the matching transition portion 8122A can slide with the transition portion 4312 of the stopper 43. The flow regulating portion 813A can cooperate with the valve port 4210 to control the flow area. The outer wall of the screw portion 811A includes an external thread, and a wear-resistant layer is provided on the portion of the screw portion 811A where the external thread is provided. The material, thickness and function of the wear-resistant layer are the same as those of the wear-resistant layer in the aforementioned embodiment 1, and will not be repeated here.

[0071] like Fig.14 and Fig.15As shown, the transmission screw member 74A is made of two materials, and the transmission screw member 74A includes an insert 741A and a base 742A. The insert 741A is made of a metal material, and in this embodiment, it is a stainless steel material, and has an axial through hole. The base 742A is made of a non-metallic material, and the insert 741A is fixed to the base 742A by injection molding. The insert 741A is cylindrical, and the insert 741A includes a gear connecting portion 744A, and the gear connecting portion 744A includes a notch portion 7441A, and the notch portion 7441A is clamped with the convex portion 721 of the output gear 72, and the notch portion 7441A is riveted and fixed to the output gear 72, and the screw portion 811A of the valve core 81A extends into the insert 741A and is screwed with the internal thread of the base 742A. Through the threaded cooperation between the valve core 81A and the plastic base 742A, the risk of the valve core 81A getting stuck during the operation process can be improved. The transmission screw 74A only rotates but does not move axially. The transmission screw 74A can drive the valve core 81A to move the valve core 81A axially relative to the transmission screw 74A, thereby moving away from or close to the valve port 4210. When the valve core 81A moves axially to the maximum stroke, the guide portion 812A of the valve core 81A abuts against the connector 63 to limit the axial upward movement of the valve core 81A, that is, to stop the valve core 81A. In this embodiment, it is specifically made of PEEK or a plastic with similar properties. For example, the valve core 81A is made of self-lubricating PEEK plastic. The valve core 81A has good wear resistance and is easy to process. In addition, during the axial sliding process of the valve core 81A relative to the stopper 43, the friction between the valve core 81A and the stopper 43 can be effectively improved.

[0072] like Fig.15 As shown, the outer wall of the insert 741A and the base 742A are circular as a whole (except for the notch 7441A of the insert 741A). The outer diameter of the insert 741A is smaller than the outer diameter of the base 742A, and the base 742A has a small diameter section 7421A and a large diameter section 7422A, and the outer diameter of the large diameter section 7422A is larger than the outer diameter of the small diameter section 7421A. Then the outer wall of the base 742A and the outer wall of the insert 741A form a first step surface 745A, and the outer wall of the base 742A includes a second step surface 746A. The base 742A is partially placed in the first step hole 630A.

[0073] Part of the lower end surface of the output gear 72 abuts against the first step surface 745A, the bearing inner ring 621 of the first bearing 62 is interference fit or transitionally connected to the outer wall of the small diameter section 7421A, and the lower end of the bearing inner ring 621 abuts against the second step surface 746A.

[0074] like Fig.15 As shown, in order to prevent the connecting member 13 from interfering with the movement of the valve core 81A and the transmission screw member 74A, an axial gap is provided between the large diameter section 7422A of the transmission screw member 74A and the connecting member 63 .

[0075] The above electric control valve can be used in marine applications. The first valve body 42 and the second valve body 41 are made of stainless steel. However, even though stainless steel is used, it is very easy to cause salt spray corrosion to the first valve body 42 and the second valve body 41 if they are exposed to high temperature and high humidity for a long time. In addition, if the above electric control valve is used in a CO2 system, the welding parts of the housing 21, the second valve body 41 and the first valve body 42 may have quality and safety risks due to the very high system pressure. Figure 2 As shown, the electric control valve also includes a second thermoplastic tube 100, which is made of PTFE. One end of the second thermoplastic tube 100 is located at the periphery of the fixing nut 3, and the other end of the second thermoplastic tube 100 is located at the periphery of the first valve body 42. Therefore, the second thermoplastic tube 100 wraps part of the fixing nut 3, the part between the fixing nut 3 and the first valve body 42, and the welding part between the second valve body 41 and the first valve body 42, thereby further improving the waterproof, anti-freezing, and anti-system pressure performance of the electric control valve.

[0076] The electric control valve provided by the present application is introduced above by way of example. The principles and implementation methods of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An electric control valve, characterized in that: It includes a valve body assembly, a motor assembly, a transmission assembly, a support seat assembly, and a valve core component. The motor assembly is fixedly connected to the support seat assembly, the support seat assembly is fixedly connected to the valve body assembly, the support seat assembly includes a seat body, a first bearing and a connecting piece, the transmission assembly includes an output gear and a transmission threaded component, the output gear is fixedly connected to the transmission threaded component, the seat body includes a bearing mounting hole, the first bearing is placed in the bearing mounting hole, the seat body, the bearing outer ring of the first bearing, and the connecting piece are limitedly connected, the bearing inner ring of the first bearing is located between the output gear and the connecting piece, and the shaft of the first bearing The inner ring of the bearing is sleeved with the transmission threaded component, and the inner ring of the bearing is fixedly connected to the transmission threaded component. The valve body assembly includes a first valve body, and the electric control valve also includes a positioner, and the positioner is placed in the first valve body, and the positioner is fixedly connected to the first valve body. The valve core component includes a valve core, and the positioner cooperates with the valve core to limit the rotation of the valve core. The valve core is threadedly connected to the transmission threaded component, and the valve core can move axially relative to the transmission threaded component. The connecting member includes a first limiting portion and a second limiting portion, and the valve core can abut against the first limiting portion, and the second limiting portion can abut against the seat body.

2. The electric control valve according to claim 1, characterized in that: The seat body includes a connecting portion, which includes the bearing mounting hole, a first bearing limiting portion, and a connecting piece limiting portion. The connecting piece abuts against the connecting piece limiting portion, the bearing outer ring is transitionally matched with the hole wall of the bearing mounting hole, one end of the bearing outer ring abuts against the first bearing limiting portion, and the other end of the bearing outer ring is in contact with or has a clearance fit with the connecting piece.

3. The electric control valve according to claim 2, characterized in that: The lower end of the seat body is riveted and fixed to the second limiting portion, the connecting member is clearance-matched with the transmission threaded component, and the upper end of the valve core can abut against the first limiting portion.

4. The electric control valve according to claim 2 or 3, characterized in that: The connector limiting portion is a downward step surface located on the inner wall of the connecting portion, and the distance between the first bearing limiting portion and the step surface is equal to the distance between the upper end surface of the bearing outer ring and the lower end surface of the bearing outer ring.

5. The electric control valve according to claim 2 or 3, characterized in that: The connector limit portion is a downward step surface located on the inner wall of the connector, and the distance between the first bearing limit portion and the step surface is at least 0.01 mm greater than the distance between the upper end surface of the bearing outer ring and the lower end surface of the bearing outer ring.

6. The electric control valve according to any one of claims 1 to 3, characterized in that: The connecting member includes a first stepped hole, the transmission threaded component includes a transmission threaded member and a support sleeve, the support sleeve is sleeved with the transmission threaded member, the support sleeve includes a collar portion and a second bearing limiting portion, the second bearing limiting portion radially extends relative to the collar portion, the second bearing limiting portion is at least partially located in the first stepped hole, the bearing inner ring is fixedly connected to the collar portion, one end of the bearing inner ring abuts against the output gear, and the other end of the bearing inner ring abuts against the second bearing limiting portion.

7. The electric control valve according to claim 6, characterized in that: The transmission threaded member includes a threaded portion, a radial protrusion and an output gear connecting portion, the output gear connecting portion is riveted and fixed to the output gear, the radial protrusion is arranged on the lower side of the second bearing limiting portion, the outer wall of the radial protrusion is clearance-matched with the inner wall of the first limiting portion, and the threaded portion is threadedly connected to the valve core.

8. The electric control valve according to claim 6, characterized in that: The transmission screw component includes an insert and a base, the insert is made of metal material, the base is plastic, the base and the insert are integrally injection molded, the insert includes an output gear connecting part, the output gear connecting part is fixedly connected to the output gear, and the valve core includes a screw part, and the screw part is threadedly connected to the base.

9. The electric control valve according to claim 2 or 3, characterized in that: The motor assembly includes a first insertion portion, and the seat body also includes a mounting cylinder portion. The motor assembly is fixedly connected to the mounting cylinder portion. The connecting portion includes a blind hole. One end of the gear positioning shaft is plugged into the blind hole, and the other end of the gear positioning shaft cooperates with the first insertion portion. The seat body and the valve body assembly form a lower cavity located at the lower side of the seat body. The seat body includes a seat body cavity. The seat body also includes a first axial through hole spaced apart from the blind hole. The first axial through hole connects the seat body cavity and the lower cavity. The mounting cylinder portion includes a wall portion and a bottom portion. An annular space is included between the wall portion and the valve body assembly. The wall portion includes a second through hole. The second through hole connects the seat body cavity and the annular space.

10. The electric control valve according to any one of claims 1 to 3, characterized in that: The valve body assembly also includes a second valve body, which is welded and fixed to the first valve body, the retainer includes a planar portion, the valve core includes a matching planar portion, and the valve core and the retainer cooperate through a sliding clearance between the planar portion and the matching planar portion to limit the rotation of the valve core.

11. The electric control valve according to any one of claims 1 to 3, characterized in that: The motor assembly also includes an upper fixing assembly, a lower fixing assembly, a rotor and a rotating shaft. The rotating shaft is fixed to the rotor by injection molding. The upper fixing assembly includes an upper fixing part and an upper bearing fixedly connected to the upper fixing part. The rotating shaft passes through the upper bearing. The rotating shaft and the upper bearing are loosely matched. The lower fixing assembly includes a lower fixing part, a limit part and a second bearing. The lower fixing part includes a flange portion, a cylindrical portion and an annular supporting portion. The second bearing is located between the cylindrical portion and the rotor. The inner ring of the second bearing is fixedly connected to the rotor. The outer ring of the second bearing abuts against the flange portion and the supporting portion.

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