An electrically operated valve

Abstract

The utility model discloses an electric valve, by the limit frame is located in the radial outer periphery of output shaft and is fixedly connected with output shaft, and the limit frame is located in the opposite side of connecting seat and is close to the valve core, and the limit frame is opposite with connecting seat and has set clearance, when fluid pressure acts on the end surface of shaft part, the limit frame can move upwards set distance until with the end surface of connecting seat, and in the case of the greater axial pressure, the limit frame can deliver part pressure to connecting seat, and due to the fixed connection of connecting seat and valve body assembly, reach force balance, thereby offset part or most of the pressure of high pressure fluid and pass to transmission mechanism through output shaft, which is favorable for reducing the extrusion between transmission mechanism due to fluid pressure, is favorable for reducing the friction loss of transmission mechanism, improves the service life of transmission mechanism, and further is favorable for improving the service life of electric valve.

Description

Technical Field

[0001] This invention relates to a flow control valve, specifically an electric valve. Background Technology

[0002] Electric valves in system pipelines generally control the flow of fluid by rotating the valve core. An electric valve generally includes a transmission mechanism, a shaft, and a valve core. The transmission mechanism is connected to the shaft, and the shaft is connected to the valve core. When high-pressure fluid acts on the shaft, the pressure is transmitted to the transmission mechanism through the shaft. This causes the transmission mechanism to be compressed, increasing the rotational friction of the transmission mechanism and thus increasing the friction loss of the transmission mechanism, which is detrimental to the service life of the electric valve. Summary of the Invention

[0003] The purpose of this invention is to provide an electric valve that helps reduce frictional losses in the transmission mechanism, thereby improving the service life of the electric valve.

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

[0005] An electric valve includes a transmission mechanism, a valve core, and a valve body assembly. The valve body assembly has a valve body cavity, and the valve core is located within the valve body cavity. The transmission mechanism is drively connected to the valve core. The electric valve also includes a connecting seat, which is fixedly connected to the valve body assembly. The connecting seat has a first through hole, which is axially disposed and extends through the connecting seat. The transmission mechanism includes an output shaft, a portion of which is located within the first through hole, and another portion of which passes through the first through hole and is located within the valve body cavity. The electric valve also includes a limiting bracket, which is located radially outward from the output shaft and fixedly connected to it. The limiting bracket is located on the side of the connecting seat relatively closer to the valve core, and is disposed opposite to the connecting seat with a predetermined gap.

[0006] The electric valve of this application has a limiting bracket mounted on the radial outer periphery of the output shaft and fixedly connected to the output shaft. The limiting bracket is located on the side of the connecting seat that is relatively close to the valve core. The limiting bracket and the connecting seat are arranged opposite each other and have a set gap. When fluid pressure acts on the end face of the output shaft, the limiting bracket, which is fixedly connected to the output shaft, can move a set distance towards the end of the connecting seat until it abuts against the end face of the connecting seat under the pressure. When the axial pressure is large, the limiting bracket can transmit part of the pressure to the connecting seat. Since the connecting seat is fixedly connected to the valve body assembly, force balance is achieved, thereby offsetting part or most of the pressure generated by the high-pressure fluid from being transmitted to the transmission mechanism through the output shaft. This helps to reduce the squeezing caused by fluid pressure between the transmission mechanisms, which helps to reduce the friction loss of the transmission mechanism, improve the service life of the transmission mechanism, and thus help to improve the service life of the electric valve. Attached Figure Description

[0007] Figure 1 This is a top view of the structure of the first embodiment of the electric valve;

[0008] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the electric valve along the AA direction.

[0009] Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the electric valve along the BB direction.

[0010] Figure 4 yes Figure 2 or Figure 3 A schematic diagram of the cross-sectional structure of the drive unit, transmission mechanism, sleeve, limit frame, limit post and connecting seat at an angle.

[0011] Figure 5 yes Figure 9 A three-dimensional structural diagram showing the connection seat engaging with the output shaft, limit bracket, and limit post at one angle;

[0012] Figure 6 yes Figure 5 A cross-sectional schematic diagram of the structure shown;

[0013] Figure 7 yes Figure 2 Or, as shown in Figure 3, a three-dimensional structural diagram of the output planetary gear assembly at one angle;

[0014] Figure 8 yes Figure 5 A three-dimensional structural diagram of the limiting frame at one angle is shown;

[0015] Figure 9 yes Figure 5 A three-dimensional structural diagram of the connector at one angle;

[0016] Figure 10 yes Figure 9 A top view of the connecting seat;

[0017] Figure 11 yes Figure 10 The diagram shows a cross-sectional view of the connector along the CC direction.

[0018] Figure 12 yes Figure 5 A three-dimensional structural diagram of one angle of the limiting post shown. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] Electric valves can be used in vehicle thermal management systems or air conditioning systems. See [link / reference] Figure 1-12 This is an embodiment of the electric valve of the present invention. The electric valve 100 includes a control device, a valve body assembly 5, and a valve core 6. The valve body assembly 5 has a valve body cavity 51, and the valve core 6 is located in the valve body cavity 51. The control device includes a drive unit 2 and a transmission mechanism 3. The drive unit 2 is used to output torque to the transmission mechanism 3. The drive unit 2 is drively connected to the transmission mechanism 3. The transmission mechanism 3 is drively connected to the valve core 6. The control device is fixedly connected to the valve body assembly 5. The electric valve 100 is electrically connected and / or signal connected to the outside world through the control device.

[0021] See Figure 2 , 3 4. The drive unit 2 includes a rotor assembly 21 and a stator assembly 22, with the stator assembly 22 located on the outer periphery of the rotor assembly 21. The rotor assembly 21 has a rotor cavity 210, and at least a portion of the transmission mechanism 3 is located in the rotor cavity 210. This arrangement of at least a portion of the transmission mechanism 3 in the rotor cavity 210 helps to reduce the axial height of the electric valve 100. The control device also includes a circuit board 7, with the stator assembly 22 electrically and / or signal-connected to the circuit board 7.

[0022] The control device also includes a sleeve 81 and a connecting seat 9. At least a portion of the sleeve 81 is located between the rotor assembly 21 and the stator assembly 22, serving as an isolation element. The sleeve 81 has a sleeve cavity 810, in which the rotor assembly 21 is located. The sleeve 81 is fixedly connected to the connecting seat 9. In this embodiment, the sleeve 81 and the connecting seat 9 are fixedly connected by welding. The connecting seat 9 has a receiving cavity 91, in which a portion of the transmission mechanism 3 is located. The connecting seat 9 is fixedly connected to the valve body assembly 5.

[0023] In this embodiment, the transmission mechanism 3 is a planetary gear mechanism. Of course, in other embodiments, the transmission mechanism 3 can be other forms of transmission mechanism. See also Figure 2 , 3 4. The transmission mechanism 3 includes a sun gear 31, a fixed gear ring 32, and at least one stage of planetary gear assembly. The transmission mechanism 3 can be configured with one or more stages of planetary gear assembly according to the required transmission ratio. For example, in this embodiment, a total of four stages of planetary gear assembly are provided along the axial direction of the transmission mechanism, including a first planetary gear assembly 33, a second planetary gear assembly 34, a third planetary gear assembly 35, and an output planetary gear assembly 36. The rotor assembly 21 includes a rotor magnetic ring 211 and a connecting plate 212. The connecting plate 212 is used as an injection-molded insert, and the rotor assembly 21 is formed by injection molding. The connecting plate 212 is fixedly connected to the sun gear 31 or injection-molded. Along the axial direction of the electric valve 100... Figure 2In the indicated OO direction, the first planetary gear assembly 33 is positioned closer to the sun gear 31 than the second planetary gear assembly 34, the second planetary gear assembly 34 is positioned closer to the sun gear 31 than the third planetary gear assembly 35, and the third planetary gear assembly 35 is positioned closer to the sun gear 31 than the output planetary gear assembly 36. The fixed gear ring 32 has internal teeth and is located on the outer periphery of the planetary gear assembly. Part of the fixed gear ring 32 is located in the rotor cavity 210, and part of the fixed gear ring 32 is located in the receiving cavity 91 of the connecting seat 9. The fixed gear ring 32 is fixedly connected to the connecting seat 9. The first planetary gear assembly 33, the second planetary gear assembly 34, and the third planetary gear assembly 35 have the same structure. The first planetary gear assembly 33 meshes with the sun gear 31 and the fixed gear ring 32, respectively; the second planetary gear assembly 34 meshes with the first planetary gear assembly 31 and the fixed gear ring 32, respectively; and the third planetary gear assembly 35 meshes with the second planetary gear assembly 36 and the fixed gear ring 32, respectively.

[0024] See Figure 7 The output planetary gear assembly 36 includes an output planetary gear 361, a positioning shaft 362, and an output shaft 363. The output planetary gear 361 is located on the outer periphery of the positioning shaft 362. The output planetary gear 361 meshes with the gears of the third planetary gear assembly 35 and the fixed gear ring 32. The positioning shaft 362 and the output shaft 363 can be injection molded as a single unit or assembled and fixed. In this embodiment, the positioning shaft 362 and the output shaft 363 are assembled and fixed. The output shaft 363 includes a first stepped portion 3631, a second stepped portion 3632, and a shaft portion 4, which are connected along the axial direction of the electric valve. Figure 2 , 3The second step portion 3632 is closer to the valve core 6 than the first step portion 3631, and the shaft portion 4 is closer to the valve core 6 than the second step portion 3632. The radial width of the first step portion 3631 is greater than the radial width of the second step portion 3632, and the radial width of the shaft portion 4 is less than the radial width of the second step portion 3632. The output shaft 363 portion is located in the receiving cavity 91 of the connecting seat 9, and the output shaft 363 portion passes through the connecting seat 9 and is connected to the valve core 6 through the shaft portion 4. In this embodiment, the valve core 6 includes a spherical or near-spherical surface. Of course, in other embodiments, the valve core 6 can also be other shapes, such as cylindrical, frustum-shaped, conical, needle-shaped, etc. The valve core 6 has a through-hole 61, and the valve body assembly 5 includes at least two flow channels 52 and 53. After the stator assembly 22 is powered on by the circuit board 7, the stator assembly 22 generates an excitation magnetic field. Under the excitation of the magnetic force, the rotor assembly 21 drives the sun gear 31 to rotate. The sun gear 31 drives the first planetary gear assembly 33 to rotate. The first planetary gear assembly 33 drives the second planetary gear assembly 34 to rotate. The second planetary gear assembly 34 drives the third planetary gear assembly 35 to rotate. The third planetary gear assembly 35 drives the output planetary gear 361 to rotate. The output planetary gear 361 drives the output shaft 363 through the positioning shaft 362. The shaft part 4 of the output shaft 363 is connected to the valve core 6. The rotation of the shaft part 4 drives the rotation of the valve core 6. As the valve core 6 rotates, the orifice 61 of the valve core 6 can connect or not connect to the flow channels 52 and 53 of the valve body assembly 5, thereby realizing the on-off control of the fluid by the electric valve. In this embodiment, the electric valve 100 is a two-way valve with two flow channels. Of course, in other embodiments, the electric valve can also be a three-way valve, a four-way valve, or other multi-way valve, that is, the valve body assembly has three, four, or other flow channels. By rotating the valve core, two or more of the flow channels can be connected, thereby realizing the switching control of the fluid by the electric valve.

[0025] See Figure 9-11 The connecting seat 9 includes a main body 92 and a first flange 93. The first flange 93 extends radially outward from the outer periphery of the sidewall of the main body 92, and the main body 92 and the first flange 93 are integrally formed. The main body 92 includes a bottom 921 and a sidewall 922, forming a receiving cavity 91 located inside the inner wall of the sidewall 922 and above the bottom 921. The bottom 921 has a first through hole 923 as an opening of the receiving cavity 91, and the first through hole 923 extends axially through the bottom 921 and is located in the middle of the bottom 921.

[0026] like Figure 2 , 3 As shown, the electric valve 100 also includes a clamping nut 82, which is sleeved on the radial outer periphery of the side wall of the main body 92 of the connecting seat 9. The clamping nut 82 abuts against one end face of the first flange 93 to... Figure 2The orientation is set to the up and down direction. In this embodiment, the clamping nut 82 abuts against the upper surface of the first flange 93, and the clamping nut 82 is threadedly connected to the valve body assembly 5, so that the connecting seat 9 is fixedly connected to the valve body assembly 5. The connecting seat 9 and the fixed gear ring 32 can be fixedly connected by welding, riveting or other methods.

[0027] Combination Figure 5 , 6 9-11, the first stepped portion 3631 of the output shaft 363 is located in the receiving cavity 91 of the connecting seat 9 and abuts against the bottom 921. The second stepped portion 3632 of the output shaft 363 has an axial height of h1 along the electric valve, and the axial depth of the first through hole 923 along the electric valve is denoted as h2. The axial height of the second stepped portion 3632 of the output shaft 363 along the electric valve is greater than the axial depth of the first through hole 923 along the electric valve, i.e., h1>h2. Therefore, a part of the second stepped portion 3632 is located inside the first through hole 923, and another part of the second stepped portion 3632 protrudes through the first through hole 923 and protrudes from the lower end face of the bottom 921. The protruding part is located in the valve body cavity 51. The axial height of the second stepped portion 3632 located in the valve body cavity 51 along the electric valve is h1-h2, where h1-h2 = 0.1~0.2mm.

[0028] See Figure 5 , 8The electric valve 100 also includes a limiting bracket 83, which is fixedly connected to the shaft portion 4. The limiting bracket 83 is located on the side of the connecting seat 9 that is relatively close to the valve core 6, and the limiting bracket 83 is arranged opposite to the connecting seat 9. The limiting bracket 83 has a mounting hole 831, which is axially arranged and extends through the limiting bracket 83. A portion of the shaft portion 4 is located in the mounting hole 831 of the limiting bracket 83, and a portion of the shaft portion 4 passes through the mounting hole 831 and is connected to the valve core 6. The shape of the mounting hole 831 is the same as the shape of the portion of the shaft portion 4 located in the mounting hole 831. The outer dimensions of the mounting hole 831 are slightly larger than the outer dimensions of the shaft portion 4. For example, the length of the mounting hole 831 is 0.02 mm larger than the length of the shaft portion 4, and the width of the mounting hole 831 is 0.02 mm larger than the width of the shaft portion 4, so that the shaft portion 4 can pass through the limiting bracket 83. A portion of the upper surface of the limiting bracket 83 abuts against the second step portion 3632 of the output shaft 363, while the other portion of the upper surface of the limiting bracket 83 does not abut against the second step portion 3632 of the output shaft 363. The lower end of the limiting bracket 83 is welded and fixed to the shaft portion 4. In this embodiment, the mounting hole 831 is approximately cuboid, and the lower end surface of the mounting hole 831 is approximately rectangular, including two parallel long sides and two parallel short sides. It can be fixed to the shaft portion 4 near the two parallel long sides by laser welding. Of course, to reinforce the limiting bracket 83 and the shaft portion 4, it can also be fixed to the shaft portion 4 by laser welding along the two parallel short sides. The limiting bracket 83 and the shaft portion 4 are fixed by assembly and welding. Compared with the limiting bracket 83 and the shaft portion 4 being fixed by tight fitting, this fixing method is more reliable, which helps to reduce the risk of limiting bracket fixation failure and extend the service life of the limiting bracket. It is understood that the mounting hole 831 can also be cylindrical or other structures, and is not limited to the cuboid structure in the embodiment.

[0029] Since the axial height h1 of the second step portion 3632 of the output shaft 363 along the electric valve is greater than the axial depth h2 of the first through hole along the electric valve, a portion of the upper end face of the limit bracket 83 abuts against the second step portion 3632 of the output shaft 363, while the other portion of the upper end face of the limit bracket 83 does not abut against the second step portion 3632 of the output shaft 363. Therefore, the upper end face of the limit bracket 83 that does not abut against the second step portion 3632 of the output shaft 363 is positioned opposite to the end face of the connecting seat 9 near the valve core 6, i.e., the lower end face of the connecting seat 9, and there is a gap. The size of this gap is h1-h2, which is usually between 0.1 and 0.2 mm. The limit bracket 83 and the connecting seat 9 maintain a certain gap, which can reduce the frictional resistance when the limit bracket 83 rotates. When the fluid flowing through the electric valve is a high-pressure fluid, the fluid in the valve body cavity 51 acts on the end face of the shaft 4, generating an axial upward pressure on the shaft 4. Under the action of the pressure, the limiting frame 83 and the output shaft 363, which are fixedly connected to the shaft 4, can move upward a certain distance until the limiting frame 83 abuts against the lower end face of the connecting seat 9. This distance is the aforementioned gap h1-h2. When the axial pressure is large, the limiting frame 83 abuts against the lower end face of the connecting seat 9, and the limiting frame 83 can transmit part of the pressure to the connecting seat 9. Since the connecting seat 9 is fixedly connected to the valve body assembly 5, force balance is achieved, thereby offsetting part or most of the pressure generated by the high-pressure fluid and transmitting it to the planetary gear assemblies 33-36 through the output shaft 363. This helps to reduce the squeezing between the planetary gear assemblies due to fluid pressure, reduces the frictional loss of the planetary gear assemblies, improves the service life of the transmission mechanism, and thus helps to improve the service life of the electric valve.

[0030] See Figure 8 The limiting frame 83 also includes a stop portion 832, which includes a first stop surface 8321, a second stop surface 8323, and a non-stop surface 8322. In this embodiment, the non-stop surface 8322 is an arc surface, and the first stop surface 8321 and the second stop surface 8323 are planes. The first stop surface 8321 is directly connected to one end of the non-stop surface 8322 or is connected through a connecting arc surface. The second stop surface 8323 is directly connected to the other end of the non-stop surface 8322 or is connected through a connecting arc surface. The first stop surface 8321 and the second stop surface 8323 are not directly connected.

[0031] The electric valve 100 also includes a limit pin 84. See also Figure 12 The limiting post 84 is roughly T-shaped and includes a head 841 and a rod 842. The diameter of the head 841 is larger than the diameter of the rod 842. See also Figure 9 , 11The connecting seat 9 also has a mounting cavity 924 for mounting the limiting post 84. The mounting cavity 924 extends axially through the bottom 921 and is farther from the central axis DD of the connecting seat 9 than the first through hole 923. The mounting cavity 924 includes an axially arranged first mounting cavity 9241 and a second mounting cavity 9242, which are connected. The second mounting cavity 9242 is closer to the valve core 6 than the first mounting cavity 9241, and the inner diameter of the first mounting cavity 9241 is larger than the inner diameter of the second mounting cavity 9242. The connecting seat 9 includes a third stepped portion 925, which serves as part of the cavity wall forming the mounting cavity 924. The portion above the stepped surface 9251 of the third stepped portion 925 is the first mounting cavity 9241, and the portion below the stepped surface 9251 is the second mounting cavity 9242. The head 841 of the limiting post 84 is located in the first mounting cavity 9241. The head 841 of the limiting part 84 abuts against the third step part 925. The head 841 of the limiting post 84 does not exceed the opening of the first mounting cavity 9241 away from the valve body assembly end, i.e., the upper opening of the first mounting cavity 9241, to prevent the limiting post 84 from affecting the rotation of the output shaft 363. The diameter of the head 841 is smaller than the inner diameter of the first mounting cavity 9241, and the head and the cavity wall forming the first mounting cavity are in clearance fit. A portion of the rod portion 842 of the limiting post 84 is located in the second mounting cavity 9242. The diameter of the rod portion 842 is slightly larger than the inner diameter of the second mounting cavity 9242. The rod portion 842 located in the second mounting cavity 9242 is interference-fitted with the cavity wall forming the second mounting cavity, i.e., the third step portion 925. The remaining portion of the rod portion 842 passes through the second mounting cavity 9242 and is located in the valve body cavity 51. This portion of the rod portion 842 can abut against the first stop surface 8321 or the second stop surface 8323 of the limiting frame 83. The limiting post 84 does not contact the non-stop surface 8322, thereby limiting the rotation angle of the limiting frame 83, and further limiting the rotation angle of the shaft portion 4. The installation of the limiting post 84 can be achieved by pressing the limiting post 84 downward from the upper end of the mounting cavity 924, so that the head 841 of the limiting post abuts against the third step portion 925 of the cavity wall forming the mounting cavity, i.e., the connecting seat 9. The third step portion 925 can restrict the movement of the limiting post 84 towards the valve body assembly 5, reduce the risk of the limiting post 84 falling into the valve body cavity 51, and improve the service life of the limiting post.

[0032] In addition, such as Figure 5 As shown, the connecting seat 9 also has a positioning hole 94, and the valve body assembly 5 is provided with a corresponding positioning pin (not shown in the attached figure). The positioning pin and the positioning hole 94 cooperate to perform a positioning function. Figure 4 and Figure 9As shown, the connecting seat 9 also includes a fourth step portion 926, located on the inner circumference of the side wall of the connecting seat 9 along the axial direction of the electric valve. The third step portion 925 is closer to the valve core than the fourth step portion 926. The connecting seat 9 also includes a riveting portion 927, located at the upper end of the main body portion 92, used for fixed connection with the fixed gear ring 32. The connecting seat 9 can be a metal part, such as stainless steel, machined to obtain the required structure and shape. Figure 3 and Figure 9 As shown, the fixed gear ring 32 has a second flange portion 321, which is located at one end of the fixed gear ring 32 near the valve body assembly 5. The second flange portion 321 extends radially outward from the outer peripheral wall of the fixed gear ring 32. The lower surface of the second flange portion 321 of the fixed gear ring 32 abuts against the fourth step portion 926, and the outer peripheral surface of the second flange portion 321 abuts against the side wall 922 of the main body portion of the connecting seat. The riveting portion 927 of the connecting seat is fixed to the fixed gear ring 32 by riveting.

[0033] 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 transmission mechanism, a valve core, and a valve body assembly, wherein the valve body assembly has a valve body cavity, the valve core is located in the valve body cavity, and the transmission mechanism is pulsatorically connected to the valve core, characterized in that: The electric valve further includes a connecting seat, which is fixedly connected to the valve body assembly. The connecting seat has a first through hole, which is axially arranged and extends through the connecting seat. The transmission mechanism includes an output shaft, a portion of which is located within the first through hole, and another portion of which passes through the first through hole and is located within the valve body cavity. The electric valve further includes a limiting bracket, which is located on the radial outer periphery of the output shaft and fixedly connected to it. The limiting bracket is located on the side of the connecting seat relatively close to the valve core, and is arranged opposite to the connecting seat with a set gap. The electric valve further includes a limiting post, which cooperates with the limiting bracket to limit the rotation angle of the output shaft. The connecting seat has a mounting cavity for mounting the limiting post.

2. The electric valve as described in claim 1, characterized in that: The output shaft includes a first stepped portion and a second stepped portion. The second stepped portion is closer to the valve core than the first stepped portion. The radial width of the first stepped portion is greater than the radial width of the second stepped portion. The first stepped portion abuts against the end face of the connecting seat away from the valve core. A portion of the second stepped portion is located in the first through hole, and another portion of the second stepped portion passes through the first through hole and is located in the valve body cavity. The limiting bracket abuts against the second stepped portion.

3. The electric valve as described in claim 2, characterized in that: The second step portion has an axial length of h1 along the electric valve, and the first through hole has an axial depth of h2 along the electric valve. The set gap is defined as h1-h2, and h1-h2 satisfies the following relationship: h1-h2=0.1~0.2mm.

4. The electric valve as described in claim 2 or 3, characterized in that: The connecting seat includes a main body, which includes a bottom and a side wall. The connecting seat has a receiving cavity located inside the inner wall of the side wall and above the bottom. A first through hole is located in the middle of the bottom and serves as an opening of the receiving cavity. The transmission mechanism includes a fixed gear ring and at least one planetary gear assembly. The fixed gear ring and the planetary gear assembly are at least partially located in the receiving cavity. The fixed gear ring is fixedly connected to the connecting seat.

5. The electric valve as described in claim 4, characterized in that: The output shaft includes a shaft portion that is closer to the valve core than the second stepped portion. The limiting frame has a mounting hole that is axially arranged and extends through the limiting frame. The outer dimensions of the mounting hole are slightly larger than the outer dimensions of the shaft portion, allowing the shaft portion to pass through the mounting hole. The shaft portion passes through the mounting hole and is connected to the valve core for transmission. The lower end of the limiting frame is welded and fixed to the shaft portion.

6. The electric valve as described in claim 5, characterized in that: The mounting cavity extends axially through the bottom and is further away from the central axis of the connecting seat than the first through hole. The limiting post includes a head and a rod. The diameter of the head is larger than the diameter of the rod. The rod is located closer to the valve core than the head. The head is located in the mounting cavity, a part of the rod is located in the mounting cavity, and another part of the rod is located in the valve body cavity.

7. The electric valve as described in claim 6, characterized in that: The limiting frame includes a stop portion, which includes a first stop surface, a second stop surface, and a non-stop surface. The first stop surface is connected to one end of the non-stop surface, and the second stop surface is connected to the other end of the non-stop surface. The rod portion located in the valve body cavity can abut against the first stop surface or the second stop surface of the limiting frame.

8. The electric valve as described in claim 6 or 7, characterized in that: The mounting cavity includes a first mounting cavity and a second mounting cavity arranged axially. The second mounting cavity is closer to the valve core than the first mounting cavity. The inner diameter of the first mounting cavity is larger than the inner diameter of the second mounting cavity. The connecting seat includes a third stepped portion, which serves as part of the cavity wall forming the mounting cavity. The head is located in the first mounting cavity and abuts against the third stepped portion. The head does not extend beyond the opening of the first mounting cavity away from the valve body assembly end. The rod portion is located in the second mounting cavity, and the rod portion is interference-fitted with the third stepped portion.

9. The electric valve as described in claim 8, characterized in that: The connecting seat includes a first flange portion, which extends radially outward from the outer periphery of the side wall of the main body portion. The electric valve also includes a clamping nut, which is sleeved on the radial outer periphery of the side wall of the main body portion. The clamping nut abuts against one end face of the first flange portion and is threadedly connected to the valve body assembly.

10. The electric valve as described in claim 9, characterized in that: The connecting seat also has a positioning hole, and the valve body assembly has a corresponding positioning post, which cooperates with the positioning hole; the connecting seat also includes a fourth step portion, which is located on the inner circumference of the side wall of the main body portion along the axial direction of the electric valve, and the third step portion is closer to the valve core than the fourth step portion; the connecting seat also includes a riveting portion, which is located at the end of the main body portion away from the valve core, and the fixed gear ring has a second flange portion, which is located at the end of the fixed gear ring near the valve body assembly, and the second flange portion extends radially outward from the outer peripheral wall of the fixed gear ring, one end face of the second flange portion of the fixed gear ring abuts against the fourth step portion, and the outer peripheral surface of the second flange portion abuts against the side wall of the main body portion, and the riveting portion of the connecting seat is fixed to the fixed gear ring by riveting.

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