CN215059663U - Electric valve - Google Patents

Abstract

The utility model provides an electrically operated valve, including spacing post and spacing, spacing post includes head and pole portion, the diameter of head is greater than the diameter of pole portion, pole portion is more close to the case setting than the head, the head be located the installation cavity and with form the chamber wall butt of installation cavity, pole portion partly is located the installation cavity, pole portion other part is located the valve body chamber, the pole portion that is located the valve body chamber cooperates the turned angle who restricts the valve rod with spacing, spacing post of the chamber wall restriction through the installation cavity with the head butt is to being close to valve body subassembly direction motion, reduce the risk that spacing post fell into the valve body intracavity, improve the life of spacing post.

Description

Electric valve

Technical Field

The utility model relates to a flow control valve, concretely relates to motorised valve.

Background

The electric valve generally controls the on-off or switching of fluid through the rotation of the valve core in a system pipeline, the electric valve generally limits the rotation angle of the valve core through a limiting structure, the limiting structure generally comprises a limiting frame and a limiting column, and how to improve the fixing mode of the limiting structure to ensure that the limiting structure is more reliably fixed is the technical problem to be improved, so that the service life of the limiting structure is prolonged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electrically operated valve is favorable to improving the fixed mode of spacing post, reduces the risk that spacing post fell into the valve body intracavity, improves the life of spacing post.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an electric valve comprises a transmission mechanism, a valve rod, a valve core and a valve body assembly, wherein the valve core is positioned in a valve body cavity formed by the valve body assembly, the transmission mechanism is in transmission connection with the valve rod, the electric valve further comprises a limiting frame and a limiting column, the limiting frame is positioned on the radial periphery of the valve rod, and the limiting frame is fixedly connected with the valve rod; the electrically operated valve comprises a connecting seat, the connecting seat is provided with a mounting cavity, the mounting cavity penetrates through the connecting seat along the axial direction, the limiting column comprises a head and a rod part, the diameter of the head is larger than that of the rod part, the rod part is closer to the valve core than the head part, the head part is located in the mounting cavity and abutted to the cavity wall forming the mounting cavity, one part of the rod part is located in the mounting cavity, the other part of the rod part is located in the valve body cavity, and the rod part of the rod part is located in the valve body cavity and matched with the limiting frame to limit the rotating angle of the valve rod.

The utility model provides an electrically operated valve, including spacing post and spacing, spacing post includes head and pole portion, the diameter of head is greater than the diameter of pole portion, pole portion is closer to the case setting than the head, the head be located the installation cavity and with the chamber wall butt that forms the installation cavity, pole portion partly is located the installation cavity, pole portion another part is located the valve body chamber, the pole portion that is located the valve body chamber cooperates the turned angle who restricts the valve rod with spacing, spacing post is to being close to valve body subassembly direction motion through the chamber wall restriction with the installation cavity of head butt, reduce the risk that spacing post fell into the valve body intracavity, improve the life of spacing post.

Drawings

Figure 1 is a schematic top view of a first embodiment of an electrically operated valve;

figure 2 is a schematic cross-sectional view of the electrically operated valve of figure 1 taken along the line a-a;

figure 3 is a schematic cross-sectional view of the electrically operated valve of figure 1 taken along the line B-B;

FIG. 4 is a schematic cross-sectional view of the driving part, the transmission mechanism, the sleeve, the valve rod, the limiting frame and the limiting column of FIG. 2 or FIG. 3, which are matched with the connecting seat at an angle;

FIG. 5 is a schematic perspective view of an angle at which the connecting base shown in FIG. 9 is engaged with the output planet carrier, the limiting frame, the valve rod and the limiting post;

FIG. 6 is a schematic cross-sectional structure of the structure shown in FIG. 5;

FIG. 7 is a schematic perspective view of an angle at which the output planet wheel assembly of FIGS. 2 or 3 mates with a valve stem;

FIG. 8 is a schematic perspective view of an angle of the stop of FIG. 5;

fig. 9 is a perspective view of an angle of the connecting socket shown in fig. 5;

FIG. 10 is a schematic top view of the connecting socket shown in FIG. 9;

FIG. 11 is a schematic cross-sectional view of the connector holder of FIG. 10 taken along the direction C-C;

fig. 12 is a schematic perspective view of an angle of the spacing post shown in fig. 5.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments:

the electric valve can be applied to a vehicle thermal management system or an air conditioning system, see fig. 1 to 12, and 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, wherein 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 comprises a driving part 2, a transmission mechanism 3 and a valve rod 4, wherein the driving part 2 is used for outputting torque to the transmission mechanism 3, the driving part 2 is in transmission connection with the transmission mechanism 3, the transmission mechanism 3 is in transmission connection with the valve rod 4, the valve rod 4 is in transmission connection with the valve core 6, the control device is fixedly connected with the valve body assembly 5, and the electric valve 100 is electrically connected with the outside and/or in signal connection through the control device.

Referring to fig. 2, 3 and 4, the driving part 2 includes a rotor assembly 21 and a stator assembly 22, and the stator assembly 22 is located at an outer circumference of the rotor assembly 21. The rotor assembly 21 has a rotor cavity 210, at least part of the transmission mechanism 3 is located in the rotor cavity 210, and at least part of the transmission mechanism 3 is located in the rotor cavity 210, which facilitates reducing the axial height of the electric valve 100. The control device further comprises a circuit board 7, the stator assembly 22 being electrically and/or signal connected to the circuit board 7.

The control device further comprises a sleeve 81 and the connecting seat 9, and at least part of the sleeve 81 is positioned between the rotor assembly 21 and the stator assembly 22 to play a role in isolation. Bushing 81 has bushing chamber 810, and rotor subassembly 21 is located bushing chamber 810, and bushing 81 and connecting seat 9 fixed connection, in this embodiment, bushing 81 and connecting seat 9 pass through welded fastening and are connected. The connecting base 9 has a receiving cavity 91, part of the transmission mechanism 3 is located in the receiving cavity 91, and the connecting base 9 is fixedly connected with the valve body assembly 5.

In the present embodiment, the transmission mechanism 3 is a planetary gear mechanism, but as another embodiment, the transmission mechanism 3 may be another type of transmission mechanism. Referring to fig. 2, 3 and 4, the transmission mechanism 3 includes a sun gear 31, a fixed gear ring 32 and at least one stage of planetary wheel assembly, and the transmission mechanism 3 may be provided with one or more stages of planetary wheel assemblies according to the requirement of the transmission ratio, for example, in this embodiment, 4 stages of planetary wheel assemblies are provided in total along the axial direction of the transmission mechanism, and each planetary wheel assembly includes a first planetary wheel assembly 33, a second planetary wheel assembly 34, a third planetary wheel assembly 35 and an output planetary wheel assembly 36. The rotor assembly 21 comprises a rotor magnetic ring 211 and a connecting plate 212, the connecting plate 212 is used as an injection molding insert, the rotor assembly 21 is formed through injection molding, and the connecting plate 212 is fixedly connected with the sun gear 31 or is formed through injection molding. In the axial direction of the electric valve 100, i.e., the O-O direction shown in fig. 2, the first planetary gear assembly 33 is disposed closer to the sun gear 31 than the second planetary gear assembly 34, the second planetary gear assembly 34 is disposed closer to the sun gear 31 than the third planetary gear assembly 35, and the third planetary gear assembly 35 is disposed closer to the sun gear 31 than the output planetary gear assembly 36. Fixed gear ring 32 has an internal tooth portion, fixed gear ring 32 is located at the periphery of the planetary wheel assembly, part of fixed gear ring 32 is located in rotor cavity 210, part of fixed gear ring 32 is located in accommodating cavity 91 of connecting base 9, and fixed gear ring 32 is fixedly connected with connecting base 9. The first planetary gear assembly 33, the second planetary gear assembly 34 and the third planetary gear assembly 35 are identical in structure, the first planetary gear assembly 33 is respectively in gear engagement with the sun gear 31 and the fixed gear ring 32, the second planetary gear assembly 34 is respectively in gear engagement with the first planetary gear assembly 31 and the fixed gear ring 32, and the third planetary gear assembly 35 is respectively in gear engagement with the second planetary gear assembly 36 and the fixed gear ring 32.

Referring to fig. 7, the output planetary gear assembly 36 includes an output planetary gear 361, a positioning shaft 362 and an output planet carrier 363, the output planetary gear 361 is located on the periphery of the positioning shaft 362, the output planetary gear 361 is in gear engagement with the third planetary gear assembly 35, the output planetary gear 361 is in gear engagement with the fixed ring gear 32, the positioning shaft 362 and the output planet carrier 363 can be molded integrally or assembled and fixed, and in this embodiment, the positioning shaft 362 and the output planet carrier 363 are assembled and fixed. The output carrier 363 includes a first stepped portion 3631 and a second stepped portion 3632, and along the axial direction of the electric valve, with reference to fig. 2 and 3, the second stepped portion 3632 is closer to the valve body 6 than the first stepped portion 3631, and the width of the first stepped portion 3631 in the radial direction is larger than the width of the second stepped portion 3632 in the radial direction. The output planet carrier 363 and the valve rod 4 can be in transmission connection through injection molding or assembly fixing, and in the embodiment, the valve rod 4 and the output planet carrier 363 are integrated through injection molding. The output planet carrier 363 is partially located in the receiving cavity 91 of the connecting seat 9, and the output planet carrier 363 partially passes through the connecting seat 9 and is connected with the valve core 6 through the valve rod 4. The valve core 6 in this embodiment includes a spherical surface or a quasi-spherical surface, but as another embodiment, the valve core 6 may have other shapes, such as a cylindrical shape, a truncated cone shape, a conical shape, a needle shape, and so on. The valve element 6 has a passage 61 therethrough and the valve body assembly 5 includes at least two flow passages 52, 53. After the circuit board 7 controls the stator assembly 22 to be powered on, the stator assembly 22 generates an excitation magnetic field, the rotor assembly 21 drives the sun gear 31 to rotate under the excitation of magnetic force, the sun gear 31 drives the first planet gear assembly 33 to rotate, the first planet gear assembly 33 drives the second planet gear assembly 34 to rotate, the second planet gear assembly 34 drives the third planet gear assembly 35 to rotate, the third planet gear assembly 35 drives the output planet gear 361 to rotate, the output planet gear 361 drives the output planet carrier 363 through the positioning shaft 362, the output planet carrier 363 and the valve rod 4 are molded into a whole by injection, the output planet carrier 363 drives the valve rod 4 to rotate, the valve rod 4 is in transmission connection with the valve core 6, the valve core 6 is driven to rotate by the rotation of the valve rod 4, and along with the rotation of the valve core 6, the pore passage 61 of the valve core 6 can be communicated or not communicated with the circulation passages 52 and 53 of the valve body assembly 5, thereby realizing the on-off control of the electric valve. In this embodiment, the electric valve 100 is a two-way valve, and the number of the flow channels is two, but as another embodiment, the electric valve may also be a three-way valve, a four-way valve or another multi-way valve, that is, the number of the flow channels of the valve body assembly is three, four or more, and two or more of the flow channels can be communicated by rotating the valve core, so as to realize the switching control of the electric valve on the fluid.

Referring to fig. 9 to 11, the connector holder 9 includes a body portion 92 and a first flange portion 93, the first flange portion 93 extending outward in a radial direction from an outer circumference of a sidewall of the body portion 92, the body portion 92 being integrally formed with the first flange portion 93. The body portion 92 includes a bottom 921 and a side wall 922, the body portion 92 forms a receiving cavity 91, and the receiving cavity 91 is located inside the inner wall of the side wall 922 above the bottom 921. The bottom 921 has a first through hole 923 as an opening for accommodating the cavity 91, the first through hole 923 being axially disposed and located in a middle portion of the bottom 921.

As shown in fig. 2 and 3, the electric valve 100 further includes a compression nut 82, the compression nut 82 is sleeved on the radial periphery of the sidewall of the main body portion 92 of the connecting seat 9, the compression nut 82 abuts against one end surface of the first flange portion 93, and the vertical direction is set in the direction of fig. 2, in this embodiment, the compression nut 82 abuts against the upper surface of the first flange portion 93, and the compression nut 82 is screwed with the valve body assembly 5, so that the connecting seat 9 is fixedly connected with the valve body assembly 5. The connecting seat 9 and the fixed gear ring 32 can be fixedly connected by welding, riveting and other modes.

With reference to fig. 5, 6, and 9-11, the first step 3631 of the output carrier 363 is located in the accommodating cavity 91 of the connecting seat 9 and abuts against the bottom 921, and the second step 3632 of the output carrier 363 has an axial height h along the electrically operated valve₁The axial depth of the first through hole 923 along the electric valve is recorded as h₂. The axial height of the second step 3632 of the output carrier 363 in the electric valve is greater than the axial depth of the first through hole 923 in the electric valve, i.e. h₁>h₂Therefore, a part of the second stepped portion 3632 is located in the first through hole 923, another part of the second stepped portion 3632 passes through the first through hole 923 and protrudes out of the lower end surface of the bottom 921, the protruding part is located in the valve body cavity 51, and the axial height of the second stepped portion 3632 located in the valve body cavity 51 along the electric valve is h₁-h₂，h₁-h₂＝0.1～0.2mm。

Referring to fig. 5 and 8, the electric valve 100 further includes a limiting frame 83, and the limiting frame 83 is fixedly connected to the valve rod 4. The limiting frame 83 is provided with a mounting hole 831, the mounting hole 831 is axially arranged and penetrates through the limiting frame 83, part of the valve rod 4 is located in the mounting hole 831 of the limiting frame 83, and part of the valve rod 4 penetrates through the mounting hole 831 to be connected with the valve core 6. The shape of the mounting hole 831 is the same as the shape of the portion of the valve rod 4 located in the mounting hole 831, and the external dimension of the mounting hole 831 is slightly larger than the external dimension of the valve rod 4, for example, the length of the mounting hole 831 is 0.02mm larger than the length of the valve rod 4, and the width of the mounting hole 831 is 0.02mm larger than the width of the valve rod 4, so that the valve rod 4 can pass through the stopper bracket 83. The upper end surface of one part of the limiting frame 83 is abutted against the second step 3632 of the output carrier 363, the upper end surface of the other part of the limiting frame 83 is not abutted against the second step 3632 of the output carrier 363, and the lower end of the limiting frame 83 is welded and fixed with the valve rod 4. In this embodiment, the mounting hole 831 is substantially a rectangular parallelepiped, the lower end surface of the mounting hole 831 is substantially a rectangle, the rectangle includes two long sides and two short sides that are arranged in parallel, and the two long sides that are arranged in parallel of the limiting frame 83 may be fixed to the valve rod 4 by laser welding, or the two short sides that are arranged in parallel may also be fixed to the valve rod 4 by laser welding in order to reinforce the limiting frame 83 and the valve rod 4. Spacing 83 is fixed with valve rod 4 through the method of assembling and adding the welding, compares in spacing 83 and valve rod 4 through the tight fit fixed, and this fixed mode is more reliable, is favorable to reducing the risk of spacing fixed failure, prolongs spacing's life. It is understood that the mounting hole 831 may also have other structures such as a cylindrical shape, and not just a rectangular parallelepiped structure in the embodiment.

Axial height h of electric valve due to second step 3632 of output carrier 363₁Is greater than the axial depth h of the first through hole along the electric valve₂ A limit rack 83 and the other part of the upper end surface of the limiting frame 83 is not abutted against the second step part 3632 of the output planet carrier 363, so that the part of the upper end surface of the limiting frame 83 which is not abutted against the second step part 3632 of the output planet carrier 363 is opposite to the end surface of the connecting seat 9 close to the valve body assembly, namely the lower end surface of the connecting seat 9, and a gap exists, and the gap is h₁-h₂，h₁-h₂Usually between 0.1 ~ 0.2mm, spacing 83 remain certain clearance with connecting seat 9, can reduce the frictional resistance when spacing 83 rotates like this. When the fluid flowing through the electric valve is high-pressure fluid, the fluid in the valve body cavity 51 acts on the end surface of the valve rod 4 to generate an axially upward pressure on the valve rod 4, and the limiting frame 83 fixedly connected with the valve rod 4 and the output planet carrier 363 can move upward by a certain distance, namely the gap h, until the limiting frame 83 abuts against the lower end surface of the connecting seat 9 under the action of the pressure₁-h₂When axial pressure is great, spacing 83 offsets with the lower terminal surface of connecting seat 9, spacing 83 can transmit partial pressure for connecting seat 9, and reach force balance because connecting seat 9 and valve body subassembly 5 fixed connection, thereby offset the pressure that some or most high-pressure fluid produced and transmit to planet wheel subassembly 33 ~ 36 at different levels through output planet carrier 363, be favorable to reducing the extrusion that causes because of fluid pressure between the planet wheel subassemblies at different levels like this, be favorable to reducing the friction loss of planet wheel subassembly, improve drive mechanism's life, and then be favorable to improving the life of motorised valve.

Referring to fig. 8, the stop rack 83 further includes a stop portion 832, the stop portion 832 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, the first stop surface 8321 and the second stop surface 8323 are flat surfaces, the first stop surface 8321 is directly connected to one end of the non-stop surface 8322 or connected to the one end of the non-stop surface 8322 through a connection arc surface, the second stop surface 8323 is directly connected to the other end of the non-stop surface 8322 or connected to the other end of the non-stop surface 8322 through a connection arc surface, and the first stop surface 8321 is not directly connected to the second stop surface 8323.

The electric valve 100 further comprises a restraining post 84. Referring to FIG. 12, the retention post 84 is generally T-shaped, and the retention post 84 includes a head 841 and a shaft 842, the head 841 having a diameter greater than the shaft 842. Referring to fig. 9 and 11, connecting seat 9 still has installation cavity 924, and installation cavity 924 is used for installing spacing post 84, and installation cavity 924 runs through bottom 921 along the axial, and installation cavity 924 is farther away from the central axis D-D of connecting seat 9 than first through-hole 923, and installation cavity 924 includes first installation cavity 9241 and the second installation cavity 9242 that the axial set up, first installation cavity 9241 and second installation cavity 9242 communicate, and second installation cavity 9242 is more close to case 6 than first installation cavity 9241, and the internal diameter of first installation cavity 9241 is greater than the internal diameter of second installation cavity 9242. The connecting holder 9 includes a third step portion 925, and the third step portion 925 is a partial cavity wall forming the mounting cavity 924, and is bounded by a step surface 9251 of the third step portion 925, the step surface 9251 is a first mounting cavity 9241 on the upper portion, and the step surface 9251 is a second mounting cavity 9242 on the lower portion. The head 841 of spacing post 84 is located first installation cavity 9241, and the head 841 and the third step portion 925 butt of spacing portion 84, the head 841 of spacing post 84 do not surpass the opening of keeping away from the valve body subassembly end of first installation cavity 9241 and be the upper end opening of first installation cavity 9241, prevent that spacing post 84 from influencing the rotation of output planet carrier 363, and the diameter of head 841 is less than the internal diameter of first installation cavity 9241, and the head is clearance fit with the chamber wall that forms first installation cavity. The part of pole portion 842 of spacing post 84 is located second installation cavity 9242, the diameter of pole portion 842 slightly is greater than the internal diameter of second installation cavity 9242, the pole portion 842 that is located in second installation cavity 9242 is interference fit with the chamber wall that forms the second installation cavity promptly between third step portion 925, the remaining part of pole portion 842 passes second installation cavity 9242 and is located valve body chamber 51, this part pole portion 842 can with the first stop surface 8321 or the second stop surface 8323 butt of spacing frame 83, spacing post 84 and non-stop surface 8322 contactless, thereby can restrict spacing frame 83 pivoted angle, and then can restrict valve rod 4 pivoted angle. The installation limiting column 84 can be pressed downwards from the upper end of the installation cavity 924 by installing the limiting column 84, so that the head 841 of the limiting column is abutted against the third step part 925 of the connecting seat 9, which is the cavity wall forming the installation cavity, the third step part 925 can limit the limiting column 84 to move towards the direction close to the valve body assembly 5, the risk that the limiting column 84 falls into the valve body cavity 51 is reduced, and the service life of the limiting column is prolonged.

In addition, as shown in fig. 5, the connecting seat 9 further has a positioning hole 94, and a corresponding positioning column (not shown in the drawings) is disposed on the valve body assembly 5, and the positioning column and the positioning hole 94 cooperate to perform a positioning function. As shown in fig. 4 and 9, the connecting socket 9 further includes a fourth step 926, the fourth step 926 is located on the inner periphery of the side wall of the connecting socket 9, and the third step 925 is closer to the valve body than the fourth step 926 in the axial direction of the electric valve. The connecting seat 9 further includes a riveting portion 927, the riveting portion 927 is located at the upper end of the main body portion 92, and the riveting portion 927 is used for fixedly connecting with the fixed gear ring 32. The connecting socket 9 may be a metal piece, for example machined from stainless steel to the desired configuration and shape. As shown in fig. 3 and 9, the fixed ring gear 32 has a second flange portion 321, the second flange portion 321 being located at an end of the fixed ring gear 32 close to the valve body assembly 5, the second flange portion 321 extending outward in the radial direction from the outer peripheral wall of the fixed ring gear 32. The lower surface of the second flange portion 321 of the fixed ring gear 32 abuts against the fourth stepped portion 926, the outer peripheral surface of the second flange portion 321 abuts against the connecting holder body side wall 922, and the caulking portion 927 of the connecting holder and the fixed ring gear 32 are fixed by caulking.

It should be noted that: the above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions and modifications thereof without departing from the spirit and scope of the present invention can be modified or replaced by other technical solutions and modifications by those skilled in the art.

Claims (10)

1. The utility model provides an electrically operated valve, includes drive mechanism, valve rod, case and valve body subassembly, the case is located the valve body chamber that the valve body subassembly formed, drive mechanism with the valve rod transmission is connected its characterized in that: the electric valve also comprises a limiting frame and a limiting column, wherein the limiting frame is positioned on the radial periphery of the valve rod and is fixedly connected with the valve rod; the electrically operated valve comprises a connecting seat, the connecting seat is provided with a mounting cavity, the mounting cavity penetrates through the connecting seat along the axial direction, the limiting column comprises a head and a rod part, the diameter of the head is larger than that of the rod part, the rod part is closer to the valve core than the head part, the head part is located in the mounting cavity and abutted to the cavity wall forming the mounting cavity, one part of the rod part is located in the mounting cavity, the other part of the rod part is located in the valve body cavity, and the rod part of the rod part is located in the valve body cavity and matched with the limiting frame to limit the rotating angle of the valve rod.

2. An electrically operated valve as claimed in claim 1, wherein: the installation cavity comprises a first installation cavity and a second installation cavity which are axially arranged, the second installation cavity is closer to the valve core than the first installation cavity, the inner diameter of the first installation cavity is larger than that of the second installation cavity, the connecting seat comprises a third step part, the third step part is used for forming a partial cavity wall of the installation cavity, the head part is located in the first installation cavity and abutted against the third step part, and the rod part is located in the second installation cavity.

3. An electrically operated valve as claimed in claim 2, wherein: with the step face of third step portion is as the border, first installation cavity is located step face top, the second installation cavity is located step face below, the head does not surpass the opening of keeping away from valve body subassembly end of first installation cavity, the diameter of head is less than the internal diameter of first installation cavity, the diameter of pole portion is greater than the internal diameter of second installation cavity, pole portion with third step portion interference fit.

4. An electrically operated valve as claimed in any one of claims 1 to 3 wherein: the limiting frame is provided with a mounting hole, the mounting hole is axially arranged and penetrates through the limiting frame, the overall dimension of the mounting hole is slightly larger than that of the valve rod, so that the valve rod can penetrate through the mounting hole, the valve rod penetrates through the mounting hole to be in transmission connection with the valve core, and the lower end of the limiting frame is welded and fixed with the valve rod.

5. An electrically operated valve as claimed in claim 4, wherein: the limiting frame comprises a stopping part, the stopping part comprises a first stopping surface, a second stopping surface and a non-stopping surface, the first stopping surface is connected with one end of the non-stopping surface, the second stopping surface is connected with the other end of the non-stopping surface, and the rod part located in the valve body cavity can be abutted against the first stopping surface or the second stopping surface of the limiting frame.

6. An electrically operated valve as claimed in claim 4, wherein: the lower end face of the mounting hole comprises long edges and short edges which are arranged in parallel, and the limiting frame is fixed with the valve rod through laser welding at the two long edges of the end face, close to the valve core, of the mounting hole.

7. An electrically operated valve as claimed in any one of claims 1 to 3 wherein: the connecting seat is fixedly connected with the valve body assembly, the connecting seat is provided with a first through hole, the first through hole is axially arranged and penetrates through the connecting seat, and the first through hole is closer to the central axis of the connecting seat than the mounting cavity; drive mechanism is including the output planet carrier, the output planet carrier with valve rod integrated into one piece or assembly are fixed, output planet carrier partly is located in the first through-hole, the other part of output planet carrier passes first through-hole is located the valve body intracavity, partly terminal surface of spacing with the output planet carrier butt, partly terminal surface of spacing not with the output planet carrier butt, spacing not with this part terminal surface of output planet carrier butt with the connecting seat is close to the relative setting of terminal surface of valve body subassembly and has and sets for the clearance.

8. An electrically operated valve as claimed in claim 7, wherein: the output planet carrier comprises a first step part and a second step part, the second step part is closer to the valve core than the first step part, the width of the first step part in the radial direction is larger than that of the second step part in the radial direction, the first step part is abutted with the connecting seat, one part of the second step part is located in the first through hole, the other part of the second step part penetrates through the first through hole and is located in the valve body cavity, and the limiting frame is abutted with the second step part.

9. An electrically operated valve as claimed in claim 8, wherein: the length of the second step part along the axial direction is h₁The depth of the first through hole is h₂Defining the set gap as h₁-h₂，h₁-h₂The following relation is satisfied: h is₁-h₂＝0.1～0.2mm。

10. An electrically operated valve as claimed in any one of claims 1 to 9 wherein: the connecting seat comprises a main body part and a first flange part, the main body part comprises a side wall and a bottom, the first flange part extends outwards along the radial direction from the periphery of the side wall of the main body part, the electric valve further comprises a compression nut, the compression nut is sleeved on the radial periphery of the side wall of the main body part of the connecting seat, the compression nut is abutted against one end face of the first flange part, and the compression nut is in threaded connection with the valve body assembly; the mounting cavity is located at the bottom of the connecting seat.

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