An electric valve and a method of assembling an electric valve

Abstract

An electric valve, the transmission part of the electric valve is tightly fitted or interference connected with the valve rod, a convex part is arranged on the shell of the control device, a convex boss is arranged on the valve body assembly, when the electric valve is assembled, the transmission output part of the control device and the matching part fixed to the valve body assembly are aligned, the control device and the valve body assembly are staggered by a set angle so that the convex part does not contact the convex boss at first, the matching part is pressed against the transmission output part, then the control device is rotated back to the normal position relative to the valve body assembly, the convex part abuts against the convex boss, the height of the convex part can make the control device move a set distance away from the valve body assembly, which is beneficial to improve the control precision of the electric control valve, beneficial to improve the situation that the transmission part, the driving part and other mechanisms in the control device are extruded due to the tight fitting connection between the transmission part and the valve rod, and beneficial to offset part or all of the axial upward pressure.

Description

Technical Field

[0001] This invention relates to an electric valve and an assembly method for the electric valve. Background Technology

[0002] Electric valves are generally used in system pipelines to control the flow of fluid. An electric valve includes a control device, valve stem, valve body assembly, and valve core. The valve core is located in the valve body cavity formed by the valve body assembly. One end of the valve stem is driven by the control device, and the other end is driven by the valve core. The control device rotates the valve stem to drive the valve core, thereby achieving the function of controlling the flow of fluid. A clearance fit is generally used between the control device and the valve stem. This clearance fit may lead to a decrease in the control accuracy of the electric valve. If a tight fit is used, the transmission components and other mechanisms inside the control device may be compressed during the assembly of the electric valve, potentially causing a decrease in the power of the control device or even stalling. Therefore, how to ensure the control accuracy of the electric valve while minimizing the compression of the transmission components and other mechanisms inside the control device is a technical problem that needs to be improved. Summary of the Invention

[0003] The purpose of this invention is to provide an electric valve and an assembly method for the electric valve, which is beneficial to improving the control accuracy of the electric valve and to improving the situation where transmission components and other mechanisms inside the control device are squeezed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An electric valve includes a control device, a valve body assembly, a valve core, and a valve stem. The valve body assembly includes a valve body, and the valve core is located in a valve body cavity formed by the valve body. The control device includes a housing and a transmission component. The transmission component is throttlely connected to the valve stem, and the valve stem is throttlely connected to the valve core. The housing is fixedly connected to the valve body. The transmission component is at least partially located in the housing and is tightly fitted to the valve stem. The housing has a protrusion located at one end of the housing near the valve body. The valve body includes a valve body main body and a boss. The boss is fixedly connected to the valve body main body or integrally formed therefrom. The boss is located at one end of the valve body main body near the control device. The protrusion and the boss abut against each other when the electric valve is in operation.

[0006] An assembly method for an electric valve includes the following steps:

[0007] The assembly of the control device includes the assembly of the transmission components, control unit, drive unit, and housing;

[0008] The assembly of the first component, including the valve component and the valve body assembly, forms the first component, which includes the valve core, valve stem and valve body assembly assembly;

[0009] The assembly of the control device and the first component includes aligning the transmission output part of the transmission component with the mating part of the valve component, and setting the control device and the first component at a set angle so that the protrusion of the control device does not contact the boss of the first component, pressing the mating part with the transmission output part, rotating the control device or the first component until the positioning pin of the valve body assembly is limited by the positioning groove of the control device, the protrusion abuts against the boss, and screwing in the first screw to fix the first component and the control device.

[0010] In this technical solution, the transmission component of the electric valve is tightly connected to the valve stem, which helps improve the control accuracy of the electric valve. Because the tight connection between the transmission component and the valve stem causes compression of the transmission components inside the control device, generating upward axial pressure, this technical solution provides a protrusion on the housing of the control device and a boss on the valve body assembly. During assembly, the transmission output part of the control device is aligned with the mating part of the first component, and the control device and the first component are offset by a set angle so that the protrusion and boss do not initially contact. After the mating part and the transmission output part are pressed together, the control device is rotated back to its original position relative to the first component, causing the protrusion and boss to abut against each other. The height of the protrusion allows the control device to move a set distance away from the valve body assembly relative to it, which helps to alleviate the compression of the transmission components and other mechanisms inside the control device and helps to offset some or all of the upward axial pressure. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the first embodiment of the electric valve from one angle;

[0012] Figure 2 yes Figure 1 A top view of the electric valve shown.

[0013] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0014] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0015] Figure 5 yes Figure 4 A magnified schematic diagram of the structure at position I in the middle;

[0016] Figure 6 yes Figure 1 A three-dimensional structural diagram of the central control device from one angle;

[0017] Figure 7 yes Figure 1 A three-dimensional structural diagram of the valve body assembly and valve stem at one angle;

[0018] Figure 8This is a three-dimensional structural diagram of the limit frame at one angle;

[0019] Figure 9 This is a three-dimensional structural diagram of the limit frame from another angle;

[0020] Figure 10 This is a schematic diagram of the assembly of the control device and valve body components;

[0021] Figure 11 This is a three-dimensional structural diagram of the second embodiment of the electric valve from one angle. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] See Figure 1-10 This is the first embodiment of an electric valve. Electric valves can be applied to vehicle thermal management systems. Electric valves include electric ball valves and electronic expansion valves, etc. This embodiment uses an electric ball valve as an example. The electric ball valve 100 includes a control device 2, valve components, and a valve body assembly 3. The valve components include a valve core and a valve stem 5. In this embodiment, the valve core is specifically a valve core ball 4. The valve body assembly 3 includes a valve body 31, and the valve core ball 4 is located in the valve body cavity 311 formed by the valve body 31. One end of the valve stem 5 is drive-connected to the control device 2, and the other end of the valve stem 5 is drive-connected to the valve core ball 4. The control device 2 outputs a rotational torque to the valve stem 5, which drives the valve core ball 4 to move.

[0024] See Figure 3 The control device 2 includes a drive unit 24, a control unit 23, and a transmission component 22. The drive unit 24 may include a rotor assembly and a stator assembly, or it may be of other forms, and is used to output torque to the transmission component. The control unit 23 includes a circuit board 231, which is electrically and / or signal-connected to the drive unit 24. The drive unit 24 is drive-connected to the transmission component 22. The transmission component 22 may be a gear reduction mechanism, or it may be of other forms of transmission structure. The control device 2 is drive-connected to the transmission component 22, and the transmission component 22 is drive-connected to the valve stem 5. The valve core ball 4 is provided with an internal channel 41, and the valve body 31 is provided with at least two flow channels 312 and 313, through which the working medium can leave or enter the valve body 31. Circuit board 231 controls drive unit 24 to generate excitation magnetic field and under the action of excitation magnetic field, drive unit 24 outputs rotational torque and transmits torque to valve stem 5 through transmission component 22. Valve stem 5 drives valve core ball 4 to rotate, so that the inner channel 41 of valve core ball 4 is connected or disconnected from the flow channel 312, 313, or selectively connected or disconnected from one of the flow channel 312, 313, thereby opening or closing or switching the flow path of electric ball valve or controlling the flow of the flow path.

[0025] The control device 2 also includes a housing 21, with the drive unit 24, control unit 23, and at least a portion of the transmission component 22 located within the housing 21. In this embodiment, the transmission component 22 includes multiple reduction gears 221 and an output gear 2211. The input end of the reduction gear 221 is connected to the output end of the drive unit 24, and the reduction gears mesh with each other. The output end of the reduction gear 221 meshes with the output gear 2211, and the output gear 2211 has a transmission output section 222 that outputs rotational torque. The transmission output section 222 can be integrally injection molded with the output gear 2211, or it can be separately configured and fixedly connected. In this embodiment, the transmission output section 222 is integrally injection molded with the output gear 2211. The housing 21 includes an upper cover 212 and a lower housing 211, which are sealed together. The lower housing 211 includes a first mounting hole 21313, which is axially oriented, and the transmission output section 222 is at least partially located within the first mounting hole 21313.

[0026] See Figure 7-9 The valve component also includes a limiting frame 6, which includes a mating part 61, a stop part 62, and a connecting hole 63. The connecting hole 63 extends axially through the limiting frame 6, and part of the connecting hole 63 is located within the mating part 61. The shape of the connecting hole 63 matches the valve stem 5. The mating part 61 is used to connect with the transmission output part 222. In this embodiment, the mating part 61 is protruding and has a star-shaped structure. The transmission output part 222 has a recess 2221. See [reference needed]. Figure 6 The recess 2221 is also star-shaped. This star shape helps limit rotational slippage between the transmission output part 222 and the mating part 61. Of course, it's understandable that the mating part 61 could also be other shapes with limiting functions, and the recess correspondingly would be a shape that mates with the mating part. The recess 2221 of the transmission output part fits tightly with the mating part 61, meaning the radial width of the mating part 61 is approximately equal to the radial width of the recess 2221. Due to manufacturing errors, they cannot be perfectly equal; therefore, in this document, an error not exceeding 0.2 mm is considered approximately equal. In this embodiment, the mating part 61 and the recess 2221 are star-shaped, thus having a maximum and minimum width. See [reference needed]. Figure 8 The maximum radial width d1 of the mating part is approximately equal to the maximum radial width d2 of the recess, and the minimum radial width d3 of the mating part is approximately equal to the minimum radial width d4 of the recess. In the axial direction, it is recommended that at least half of the mating part extend into the transmission output part to ensure a more secure connection between the two.

[0027] The stop part 62 includes a stop section 621, which limits the rotation angle of the valve stem 5. Specifically, see [link to relevant documentation]. Figure 7The valve body assembly also includes a limiting post 32, which is integrally formed or fixedly connected to the valve body 31. Part of the valve stem 5 is located in the connecting hole 63, and the limiting frame 6 is sleeved on the radial outer periphery of the valve stem 5 through the connecting hole 63, thus being fixedly connected to the valve stem 5. The limiting frame 6 is connected to the transmission component 22 via the mating part 61 and the transmission output part 222. The limiting frame 6 has a protrusion 64 at one end near the valve body 31, which helps to reduce the contact area between the limiting frame and the valve body, thereby reducing the frictional force when the limiting frame 6 rotates relative to the valve body 31. The control device 2 outputs a rotational torque through the transmission output part 222, which drives the limiting frame 6 to rotate, which in turn drives the valve stem 5 to rotate, and the valve stem 5 drives the valve core ball 4 to rotate. During the rotation of the limit frame 6, the stop section 621 of the stop part can abut against the limit post 32 of the valve body assembly, thereby limiting the rotation angle of the limit frame 6, and thus limiting the rotation angle of the valve stem 5.

[0028] The control device also includes a detection component for detecting the rotation angle of the output gear 2211. The detection component includes a permanent magnet 25 and a Hall sensor 26. The permanent magnet 25 has at least two different magnetic poles and is located at the end of the output gear 2211 near the circuit board 231. The permanent magnet 25 is fixedly connected to the output gear 2211 and can rotate with the output gear 2211. The Hall sensor 26 is electrically and signal-connected to the circuit board. The Hall sensor 26 is located above the permanent magnet 25 and positioned on the side of the circuit board near the permanent magnet. Thus, the permanent magnet 25 and the Hall sensor 26... Because the distance between them is relatively close, when the permanent magnet 25 rotates with the output gear 2211, the Hall sensor 26 can accurately detect the change in magnetic poles caused by the rotation of the permanent magnet 25 with the output gear 2211. Then, the circuit board 231 calculates the angle through which the permanent magnet 25 rotates with the output gear 2211. Compared with the traditional scheme where the transmission output part and the mating part are in a radial clearance fit, the clearance fit causes the rotation of the transmission output part and the valve stem to be asynchronous, resulting in a certain time difference. The angle through which the permanent magnet rotates with the output gear is not equal to the actual angle through which the valve stem drives the valve core ball to rotate, which affects the accuracy of the detection results of the detection component. In this embodiment, since the transmission output part 222 of the output gear is tightly fitted with the mating part 61, that is, the transmission output part 222 and the valve stem 5 are also tightly fitted, the rotation of the transmission output part 222 can simultaneously drive the valve stem 5 to rotate, and the valve stem 5 drives the valve core ball 4 to rotate. The angle through which the permanent magnet 25 rotates with the output gear 2211 is equal to the actual angle through which the valve stem 5 drives the valve core ball 4 to rotate, thereby enabling feedback on the position of the valve core ball 4. The detection result of the detection component is more accurate, thereby improving the control accuracy of the ball valve.

[0029] Because the transmission output part and the mating part are tightly fitted, the mating part needs to be pressed into the transmission output part during the assembly of the electric valve. This process may cause a certain amount of axial compression to the drive part, transmission components, and other parts, thereby generating an upward axial pressure on the control device. This may lead to a decrease in the power of the control device, or even a stall in severe cases. In order to partially or completely counteract the upward axial pressure, the structure of the electric valve needs to be improved.

[0030] See Figure 3-6 The lower housing 211 includes a side portion 214, a bottom portion 213, and a mounting portion 215, which are integrally injection molded. The bottom portion 213 includes a first bottom portion 2131, which has a first bottom surface 21311. The mounting portion 215 has a second mounting hole 2151, which is axially disposed and penetrates the first bottom portion 2131. The mounting portion 215 also includes a protrusion 2152, which is located at one end of the mounting portion 215 near the valve body 31. The protrusion 2152 protrudes from the first bottom surface 21311 toward the valve body 31 by a set height H1. The second mounting hole 2151 also penetrates the protrusion 2152. Figure 5 Viewed from the indicated direction, the protrusion 2152 is located at the lower end of the mounting portion 215, and the lower end surface of the protrusion 2152 is closer to the valve body 31 than the first bottom surface 21311.

[0031] The valve body 31 also includes a boss 316 and a valve body 315. The boss 316 is located above the valve body 315 and protrudes from the valve body 315 by a set height H2. The boss 316 covers part of the upper surface of the valve body 315, while part of the upper surface of the valve body 315 is not covered by the boss 316. The boss 316 is fixedly connected to the valve body 315 or integrally formed. The limiting bracket 6, the positioning groove 33, and the limiting post 32 are located above the boss 316. The valve body 31 is provided with screw holes 314 corresponding to the position and number of mounting parts. The screw holes 314 are located in the area where the boss 316 is located. The height H2 of the boss 316 protruding from the valve body 315 should be greater than or equal to the distance H1 from the lower end surface of the mounting part 2152 to the first bottom surface 21311.

[0032] This embodiment, through the design of the protrusion 2152 of the mounting part 215 and the boss 316 of the valve body 31, can partially or completely offset the upward axial pressure. The principle is as follows, see below. Figure 10When assembling the electric valve, first fix the limit bracket to the valve body assembly, then assemble the control device and the valve body assembly separately. Then align the transmission output part 222 of the control device with the mating part 61 of the limit bracket, and offset the control device 2 and the valve body assembly 3 by a set angle. At this time, the protrusion 2152 of the mounting part and the boss 316 have not yet contacted each other. Press the mating part 61 into the transmission output part 222. After pressing, the internal components of the control device are subjected to axial compression, and the control device 2 is rotated back to the center relative to the valve body assembly 3, so that the protrusion 2152 of the mounting part abuts against the boss 316. During the rotation back to the center, the distance H1 from the lower end face of the protrusion 2152 to the first bottom surface 21311, which is the protrusion height of the protrusion, can make the control device 2 move a certain distance away from the valve body assembly 3 relative to the valve body assembly 3. This distance is theoretically equal to H1, which is beneficial to improve the situation of the transmission components, drive parts and other mechanisms inside the control device being squeezed, and is beneficial to offset at least part of the axial upward pressure.

[0033] To minimize the upward axial pressure on the control device caused by the tight connection between the transmission output part 222 and the mating part 61, the distance H1 from the lower end face of the protrusion 2152 to the first bottom surface 21311 has certain requirements. Theoretically, the distance H1 from the lower end face of the protrusion 2152 to the first bottom surface 21311 should be greater than or equal to the total reduction in the clearance between the transmission components caused by the connection between the transmission output part 222 and the mating part 61 in the axial direction. In this embodiment, the preceding gear of the output gear 2211 is denoted as the first gear 2212. In this embodiment, the main factors causing the reduction in the clearance between the transmission components due to the connection between the transmission output part and the mating part are the clearance h1 between the output gear 2211 and the first gear 2212, and the clearance h2 between the first gear 2212 and the partition 2213 that fixes the first gear. The influence of other gears is negligible. The distance H1 from the lower end face of the protrusion to the first bottom surface is greater than or equal to the sum of h1 and h2. In this embodiment, h1 and h2 are approximately 0.3 mm, so H1 can be designed to be 0.3 mm or more. Depending on the structure of different control devices, specific analysis is required, and the distance H1 from the lower end face of the protrusion to the first bottom surface should be adjusted appropriately. Generally, a distance H1 between 0.2 and 1 mm can meet the requirements of most electric valves.

[0034] The boss 316 on the valve body 31 is mainly for smoother assembly. Since the height H2 of the boss 316 protruding from the valve body 315 is greater than or equal to the distance H1 from the lower end face of the mounting portion 2152 to the first bottom surface 21311, the mounting portion 2152 will not jam against the valve body 315 when the control device and valve body assembly are pressed together at a staggered angle. Without the boss 316, the mounting portion 2152 would abut against the valve body 315 after the control device and valve body assembly are pressed together at a staggered angle, making it impossible to rotate back to the correct position. This would prevent the control device 2 from moving a certain distance away from the valve body assembly 3, thus failing to counteract some of the upward axial pressure. (See also...) Figure 5 After assembly, the lower end face of the mounting protrusion 2152 abuts against the upper end face of the boss 316. There is a gap between the first bottom surface and the upper end face of the boss 316.

[0035] In this embodiment, there are four mounting parts 215, distributed at the four corners of the first bottom. The valve body 31 has screw holes 314 corresponding to the position and number of mounting parts. The electric ball valve 100 also includes four first screws 7. The first screws 7 are passed through the second mounting holes 2151 and inserted into the screw holes 314. The first screws 7 are tightened so that the valve body assembly 3 is connected to the control device 2. The lower end face of the protrusion 2152 abuts against the boss 316 of the valve body 31. It can be understood that the number and position of the mounting parts 215 can be adjusted according to the actual situation. For example, when the control device 2 is roughly cylindrical, the mounting parts can be distributed along the circumference of the bottom, and the number can be adjusted to two, three, four or more. The position of the protrusion can also be adjusted. It does not have to be located at the end of the mounting part 215 close to the valve body 31. It can also be located at other positions of the first bottom. It is just that in this embodiment, the protrusion is set in the mounting part for the convenience of processing and installation.

[0036] See Figure 6The first bottom 2131 also has a second recess 21312, which is recessed from the first bottom surface 21311 towards the upper cover 212. The opening 21313a of the first mounting hole 21313 near the valve body is located in the second recess 21312. Part of the transmission output part 222 is located in the second recess 21312, as are part of the limiting bracket 6 and part of the valve stem 5. It can be understood that the transmission output part 222 may not be located in the second recess 21312. The lower end face of the transmission output part 222 may be located inside the channel of the first mounting hole 21313, or the lower end face of the transmission output part 222 may be flush with the opening 21313a of the first mounting hole 21313 near the valve body. When a portion of the transmission output section 222 is located in the second recess 21312, the lower end surface of the transmission output section 222 does not extend beyond the plane of the first bottom surface 21311. This facilitates efficient use of the electric valve's space and also aids in the assembly of subsequent control devices and valve body components. Figure 7 As shown, the bottom 213 also includes a positioning post 21314. In this embodiment, the positioning post 21314 is located in the second recess 21312. The positioning post 21314 extends from the second recess 21312 toward the valve body 31. The valve body assembly 3 is provided with a positioning groove 33 corresponding to the positioning post 21314. The positioning groove 33 can limit the stroke of the positioning post 21314 when it rotates with the control device. The positioning post installed at the extreme position of the positioning groove plays a positioning role for the valve body and the control head.

[0037] This embodiment also provides an assembly method for an electric valve, including the following steps:

[0038] The assembly of the control device 2 includes the assembly of the transmission component 22, the control unit 23, the drive unit 24 and the housing 21. It also includes assembling the drive unit 24 and the transmission component 22 to the corresponding positions of the lower housing 211, installing the assembled control unit 23 to the corresponding position of the lower housing 211, and electrically and signal connecting the control unit 23 and the drive unit 24. The control unit 23 is fixedly connected to the housing, and the upper cover 212 is sealed to the lower housing 211.

[0039] In this embodiment, the drive unit 24 includes a stator assembly and a rotor assembly, the control unit 23 includes a circuit board 231, and the transmission component 22 includes a plurality of reduction gears 221, a first gear 2212 located at the front end of the output gear, and an output gear 2211. Assembling the drive unit 24 to the corresponding position of the lower housing 211 includes: assembling the stator assembly and the rotor assembly to the corresponding position of the lower housing 211; assembling the transmission component 22 to the corresponding position of the lower housing 211 includes connecting the input end of the reduction gear 221 to the rotor assembly for transmission. The gears 221 and 221 are meshed together. The first gear 2212 meshes with the reduction gear and the output gear 2211. The output gear 2211 with the transmission output part 222 is installed in the reserved position of the lower housing 211, such that part of the transmission output part 222 is located in the first mounting hole 21313 and part of the transmission output part 222 is located in the second recess 21312. The electrical and signal connection between the control unit 23 and the drive unit 24 includes the electrical and signal connection between the circuit board 231 and the stator assembly through pins.

[0040] The assembly of the first component, the valve component and the valve body assembly 3 are assembled to form the first component, including the assembly of the valve core, valve stem 5 and limit frame 6 with the valve body assembly 3. Specifically, it includes the assembly of the valve core and the valve body assembly 3, the valve stem 5 and the valve core are connected by a plug-in transmission, and the limit frame 6 is sleeved on the outer periphery of the valve stem 5 through the connecting hole 63, and the limit frame 6 is fixedly connected to the valve stem 5.

[0041] Assemble the control device 2 with the first component, see [reference]. Figure 10 The process includes aligning the transmission output part 222 of the control device with the mating part 61 of the first component, and setting the control device 2 and the valve body assembly 3 of the assembled valve component at a set angle. At this time, the protrusion 2152 of the mounting part and the boss 316 have not yet made contact. The mating part 61 is pressed into the transmission output part 222, and the control device 2 or the first component is rotated until the positioning post 21314 is limited by the positioning groove 33 and cannot continue to rotate. At this time, the screw hole 314 of the first component is aligned with the second mounting hole 2151 of the control device 2, the protrusion 2152 abuts against the boss 316, and the first screw 7 is screwed in to fix the first component and the control device 2.

[0042] The offset angle here refers to the fact that, relative to the position of the assembled control device and the first component, there is a certain angular difference between the control device and the first component. The second mounting hole 2151 of the control device and the screw hole 314 of the first component are not aligned. The line connecting the projection of the central axis of the second mounting hole 2151 onto the plane of the upper cover 212 and the projection of the central axis of the transmission output part 222 onto the plane of the upper cover 212 is denoted as the first line L1. The line connecting the projection of the central axis of the screw hole 314 corresponding to the assembled position of the second mounting hole 2151 onto the plane of the upper cover 212 and the projection of the central axis of the transmission output part 222 onto the plane of the upper cover 212 is denoted as the second line L2. The included angle between the first line L1 and the second line L2 is the offset angle α in this embodiment. The offset angle α can be adjusted between 20 and 70° according to the actual situation. In this embodiment, the offset angle α is 45°.

[0043] In order to make the rotation return process of the control device 2 relative to the valve body assembly 3 smoother, the mounting part 215 also includes a connecting part 2153. The connecting part 2153 connects the lower end face of the protrusion 2152 to the first bottom surface 21311. The connecting part 2153 has a certain slope or curvature, which helps to reduce the frictional resistance during the rotation return process of the control device relative to the first component, making the assembly smoother.

[0044] See Figure 6 In this embodiment, the lower housing 211 further includes a second bottom 2132, which has a second bottom surface 2132a. The first bottom surface 21311 is closer to the valve body 315 than the second bottom surface 2132a. The valve body 31 corresponding to the position of the second bottom 2132 does not have a boss. The control device in this embodiment is generally rectangular and relatively long and narrow. Therefore, the lower housing 211 is designed in two sections, with the second bottom surface 2132a being farther away from the valve body than the first bottom surface 21311. This is also to make the rotation return process of the control device relative to the valve body assembly smoother. It is understood that the second bottom is not necessary in every control device; it is only an adjustment made in this embodiment based on the shape of the control device.

[0045] Figure 11 This is the second embodiment of the technical solution. The main difference between the second and first embodiments is that in the second embodiment, the control device 2' is generally cylindrical, and the lower housing of the control device includes a first bottom 2131', but does not include the second bottom as in the first embodiment. Of course, the internal structure of the control device in the second embodiment can also differ from that in the first embodiment, but the structure of the mating part between the transmission output part and the limit frame, the design of the protrusion, and the valve body protrusion are the same as or similar to those in the first embodiment.

[0046] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electric valve, comprising a control device, a valve body assembly, a valve core, and a valve stem, wherein the valve body assembly includes a valve body, the valve core is located in a valve body cavity formed by the valve body, the control device includes a housing and a transmission component, the transmission component is throttlely connected to the valve stem, the valve stem is throttlely connected to the valve core, the housing is fixedly connected to the valve body, and the transmission component is at least partially located in the housing, characterized in that: The transmission component is tightly connected to the valve stem. The housing has a protrusion located at one end of the housing near the valve body. The valve body includes a valve body main body and a boss. The boss is fixedly connected to the valve body main body or integrally formed. The boss is located at one end of the valve body main body near the control device. The protrusion and the boss abut against each other when the electric valve is working.

2. The electric valve as described in claim 1, characterized in that: The transmission component includes a transmission output section for outputting rotational torque. The transmission output section is tightly connected to the valve stem. The control device includes a detection component and a control unit. The detection component includes a permanent magnet and a Hall sensor. The permanent magnet is fixedly connected to the transmission output section. The Hall sensor is electrically and signal-connected to the control unit. The Hall sensor is positioned close to the permanent magnet.

3. The electric valve as described in claim 1 or 2, characterized in that: The housing includes an upper cover and a lower housing. The upper cover is sealed to the lower housing. The lower housing includes a first bottom, which has a first bottom surface. The protrusion protrudes from the first bottom surface toward the valve body at a predetermined height, which is 0.2 to 1 mm. The first bottom surface and the protrusion have a predetermined gap. The predetermined height of the protrusion protruding from the first bottom surface toward the valve body is less than or equal to the height of the protrusion.

4. The electric valve as described in claim 3, characterized in that: The first bottom has a positioning post, which extends axially toward the valve body. The valve body has a positioning groove corresponding to the positioning post, and the positioning post is located in the positioning groove.

5. The electric valve as described in claim 3, characterized in that: The electric valve includes a limiting frame, which includes a mating part and a connecting hole. The mating part protrudes outward, and the transmission output part has a recess. The recess is tightly fitted to the mating part. The connecting hole is partially located in the mating part and extends axially through the limiting frame. Part of the valve stem is located in the connecting hole, and the limiting frame is fixedly connected to the valve stem through the connecting hole.

6. The electric valve as described in claim 3, characterized in that: The first bottom has a first mounting hole, which is axially arranged, and the transmission output part is at least partially located in the first mounting hole; the lower housing includes a mounting part, which includes a second mounting hole and the protrusion, the protrusion being located at one end of the mounting part near the valve body, the second mounting hole being axially open and penetrating the first bottom and the protrusion, the valve body having a threaded hole corresponding to the second mounting hole, and the control device being threadedly connected to the valve body.

7. The electric valve as described in claim 4 or 5, characterized in that: The first bottom has a first mounting hole, which is axially arranged, and the transmission output part is at least partially located in the first mounting hole; the lower housing includes a mounting part, which includes a second mounting hole and the protrusion, the protrusion being located at one end of the mounting part near the valve body, the second mounting hole being axially open and penetrating the first bottom and the protrusion, the valve body having a threaded hole corresponding to the second mounting hole, and the control device being threadedly connected to the valve body.

8. The electric valve as described in claim 2, characterized in that: The transmission component includes a reduction gear and an output gear. The reduction gear is meshed with the output gear. The output gear has the transmission output section. The permanent magnet is fixedly connected to the output gear. The permanent magnet is located on the side of the output gear closer to the control section. The Hall sensor is located on the side of the control section closer to the permanent magnet.

9. A method for assembling an electric valve, characterized in that, Includes the following steps: The assembly of the control device includes the assembly of the transmission components, control unit, drive unit, and housing; The assembly of the first component, including the valve component and the valve body assembly, forms the first component, which includes the valve core, valve stem and valve body assembly assembly; The assembly of the control device and the first component includes aligning the transmission output part of the transmission component with the mating part of the valve component, and setting the control device and the first component at a set angle so that the protrusion of the control device does not contact the boss of the first component, the mating part is pressed against the transmission output part, rotating the control device or the first component until the positioning pin of the control device is limited by the positioning groove of the valve body assembly, the protrusion abuts against the boss, and screwing in the first screw to fix the first component and the control device.

10. The assembly method as described in claim 9, characterized in that: The assembly of the drive unit and the housing includes assembling the drive unit to the corresponding position of the lower housing included in the housing; the assembly of the transmission component and the housing includes a transmission connection between the input end of the transmission component and the drive unit, and the installation of the transmission output unit to the reserved position of the lower housing; the assembly of the control unit and the housing includes an electrical connection and a signal connection between the control unit and the drive unit via pins, and a fixed connection between the control unit and the housing. The valve core, valve stem, and valve body assembly includes the valve core and valve body assembly, the valve stem and valve core are connected by a plug-in transmission, and the valve component's limiting bracket is sleeved on the outer periphery of the valve stem through a connecting hole, and the limiting bracket is fixedly connected to the valve stem.

11. The assembly method as described in claim 9, characterized in that: The line connecting the projection of the central axis of the second mounting hole of the control device onto the plane of the upper cover included in the housing and the projection of the central axis of the transmission output part onto the plane of the upper cover is called the first line. The line connecting the projection of the central axis of the screw hole of the first component corresponding to the assembly position of the second mounting hole onto the plane of the upper cover and the projection of the central axis of the transmission output part onto the plane of the upper cover is called the second line. The included angle between the first line and the second line is the offset setting angle, which is 20~70°.

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