CN214888894U - Electric valve - Google Patents

Abstract

The utility model discloses an electric valve, which comprises a valve body component, a guide component, a transmission component and a valve core component, the transmission component comprises a threaded shaft, the threaded shaft comprises an external thread part, the valve core component comprises a connecting component and a valve head component, the connecting member is connected with the valve head member, the connecting member includes an internal threaded portion and a first mating portion, the internal thread part is in threaded connection with the external thread part, the threaded shaft can drive the valve core part to move along the axial direction of the valve body part, the valve head part can be close to or far away from the valve port part of the electric valve, the valve core part comprises an inner cavity, the inner cavity is located between the threaded shaft and the valve head part, a communication channel is arranged between the valve head part and the connecting part, and the communication channel is communicated with the inner cavity and the outside of the valve core part. The operational reliability of the valve element member can be improved.

Description

Electric valve

Technical Field

The utility model relates to a fluid control technical field especially relates to an electrically operated valve.

Background

Fig. 1 is a partial schematic structural diagram of a prior art electric valve. The electric valve comprises a threaded rod 01 and a valve core part 02. The internal thread of the valve core component 02 is matched with the external thread of the threaded rod 01, and the rotor of the electric valve rotates to drive the threaded rod 01 to rotate, so that the threaded rod 01 drives the valve core component 02 to move axially to adjust the flow of the electric valve.

Because the valve core component 02 is far away from or close to the valve port 03 through the matching of the internal thread of the valve core component 02 and the external thread of the threaded rod 01, in order to ensure the reliability of the matching of the valve core component 02 and the valve port 03, the gap between the internal thread of the valve core component 02 and the external thread of the threaded rod 01 is not easy to be too large, otherwise, not only the conduction is unstable in the operation process, but also the valve opening pulse is not easy to control when the electric valve is completely closed and then opened. A cavity is generally formed between the lower end of the threaded rod 01 and the valve core component 02, and the cavity is communicated with the outside only through a gap between the internal thread of the valve core component 02 and the external thread of the threaded rod 01, so that in the operation process of the electric valve, along with the movement process of the valve core component 02 relative to the valve port 03, air in the cavity is compressed or expanded, force which is not beneficial to the movement of the valve core component 02 relative to the valve port 03 is generated, and the operation reliability of the electric valve is influenced.

SUMMERY OF THE UTILITY MODEL

The application aims to provide an electric valve which comprises a valve body component, a guide component, a transmission component and a valve core component, the transmission component comprises a threaded shaft, the threaded shaft comprises an external thread part, the valve core component comprises a connecting component and a valve head component, the connecting member is connected with the valve head member, the connecting member includes an internal threaded portion and a first mating portion, the internal thread part is in threaded connection with the external thread part, the threaded shaft can drive the valve core part to move along the axial direction of the valve body part, the valve head part can be close to or far away from the valve port part of the electric valve, the valve core part comprises an inner cavity, the inner cavity is located between the threaded shaft and the valve head part, a communication channel is arranged between the valve head part and the connecting part, and the communication channel is communicated with the inner cavity and the outside of the valve core part.

According to the electric valve, the communicating channel is arranged between the valve head part and the connecting part and is communicated with the inner cavity and the outer part of the valve core part, so that the pressure in the inner cavity is released through the communicating channel, the pressure is not only released through a thread clearance between the inner thread part and the outer thread part, and the action reliability of the valve core part in the valve opening process of the electric valve is improved.

Drawings

Fig. 1 is a schematic structural diagram of a related art electric valve;

fig. 2 is a schematic structural diagram of a first embodiment of the electrically operated valve of the present invention;

FIG. 3 is an enlarged schematic view at I1 in FIG. 2;

FIG. 4 is a perspective view of the guide sleeve of FIG. 2 in half section;

FIG. 5 is a perspective view of the valve core member of FIG. 2;

FIG. 6 is a perspective view of the second connector of FIG. 2;

FIG. 7 is a cross-sectional view of the second connector of FIG. 6;

FIG. 8 shows a perspective view of the valve head of FIG. 2;

fig. 9 is a schematic structural view of a second embodiment of the electrically operated valve of the present invention;

fig. 10 is an enlarged view of fig. 9 at I2.

Detailed Description

It should be noted that, if the directional terms such as "upper" and "lower" are used herein, they are defined with reference to the position shown in the drawings of the present specification, and it should be understood that the directional terms are used only for clarity and convenience of describing the technical solutions and should not limit the scope of protection.

In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions of the present application are further described below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 2 and 3, the electric valve includes a valve body member 1, a guide member 2, a transmission member 3, and a valve body member 4.

The valve body assembly 1 includes an upper valve body 11 and a lower valve body 12, and the lower valve body 12 includes a lower valve body 121 and a valve port seat 122. The valve port seat 122 is partially located in the lower valve body 121, the valve port seat 122 extends from the lower opening of the lower valve body 121 and is welded and fixed with the first connecting pipe a, and the valve port seat 122 includes a valve port 1220. Here, it is understood that the valve port 1220 of the electric valve may be provided in the lower valve body 121. The lower end of the upper valve body 11 is welded and fixed with the lower valve body 121. The transmission component 3, the guide component 2 and the valve core component 4 are arranged in the cavity of the valve body component 1.

As shown in fig. 2 and 4, the guide member 2 includes a guide bush 21, and the guide bush 21 has a cylindrical shape. The guide sleeve 21 and the lower valve body 121 are directly welded and fixed or indirectly fixed through a third piece or the guide sleeve 21 and the lower valve body 121 are connected in a press fit interference fit mode. When the guide sleeve 21 and the lower valve body 121 are directly welded and fixed or press-fitted in interference fit, the coaxiality between the guide sleeve 21 and the lower valve body 121 can be more easily ensured. The transmission component 3 comprises a threaded shaft 31, a bearing 32 and a rotor 33, wherein the upper end of the guide sleeve 21 extends into the rotor 33, namely, the guide sleeve 21 is partially positioned in the rotor 33, so that the internal space of the rotor 33 can be effectively utilized, and the axial and radial dimensions of the electric valve can be reduced. The threaded shaft 31 includes an externally threaded portion 311. The guide sleeve 21 limits the axial movement of the transmission member 3 relative to the valve body member 1. Specifically, as shown in the figure, the guide sleeve 21 includes a bearing mounting portion 20, and as shown in fig. 4, the bearing mounting portion 20 includes a convex ring 25 protruding toward the threaded shaft 31 as a bearing support portion, and the bearing 32 is at least partially located in the bearing mounting portion 20 and seated on the convex ring 25. The bearing mounting portion 20 is fixedly connected with the bearing 32 in a manner that the two are directly riveted, welded or clamped through a third piece.

The bearing 32 includes a bearing inner ring 321 and a bearing outer ring 322, and the bearing outer ring 322 is fixedly connected to the bearing mounting portion 20 so that the bearing outer ring 322 does not rotate circumferentially with respect to the guide sleeve 21. The threaded shaft 31 penetrates through the bearing inner ring 321, the threaded shaft 31 is in clearance fit or interference fit with the bearing inner ring 321, and balls are arranged between the bearing inner ring 321 and the bearing outer ring 322. The specific connection mode of the bearing inner ring 321 and the threaded shaft 31 is as follows: the transmission component 3 comprises a fixing sleeve 34, the fixing sleeve 34 is sleeved or clamped on the periphery of the threaded shaft 31, and the fixing sleeve 34 is in interference fit or welded and fixed with the threaded shaft 31. The threaded shaft 31 includes a side protrusion 310, and the bearing inner ring 321 directly contacts the fixed sleeve 34 and the side protrusion 310.

As shown in fig. 3 and 5, the spool member 4 can be close to or away from the valve port portion 1220 of the electric valve, and the spool member 4 includes the connection member 41 and the valve head member 42. The guide sleeve 21 includes a guide sleeve engagement surface 215, and the connection part 41 includes a spool engagement surface 4134, and during axial movement of the spool part 4 along the valve body part 1, the spool engagement surface 4134 slidably engages with the guide sleeve engagement surface 215, so that the guide sleeve 21 provides guidance for axial movement of the spool part 4.

The connecting member 41 is slidably fitted to the guide sleeve 21. The valve head part 42 is connected to the connection part 41. As shown in fig. 2 and 4, the guide sleeve 21 includes a first rotation stopper 211, the coupling member 41 includes a female screw 411 and a first engagement portion 412, and the female screw 411 is screwed to the male screw 311 of the threaded shaft 31. One of the first rotation stopping portion 211 and the first matching portion 412 is a convex portion, the other is a concave portion, the guide sleeve 21 and the valve core component 4 are in concave-convex matching through the convex portion and the concave portion, so that the guide sleeve 21 can limit the circumferential rotation of the valve core component 4 relative to the guide sleeve 21, and further the threaded shaft 31 can drive the valve core component 4 to move along the axial direction of the valve body component 1, so as to open or close the valve port portion 1220 of the electric valve.

The guide sleeve 21 includes a stopper 214, and the stopper 214 is an internal protrusion protruding in the radial direction of the threaded shaft 31 relative to the guide sleeve mating surface 215, and may be a ring or a plurality of ribs. The stopper 214 is located between the lower end of the bearing 32 and the valve element 4, and the valve element 4 can abut against the stopper 214, that is, the stopper 214 can limit the maximum stroke of the valve element 4 away from the valve port 1220, so that the valve element 4 can not move in the direction away from the valve port 1220 any more when reaching the maximum stroke. The stopper portion 214 and the bearing support portion 25 form a stepped hole, and the upper end surface of the stopper portion 214 is closer to the valve port portion 1220 than the upper end surface of the bearing support portion 25, that is, the bearing support portion 25 and the stopper portion 214 are provided at a position offset in the axial direction of the guide sleeve 21, in order to prevent interference with a bearing inner race 321 described below.

The guide sleeve 21 includes grooves 211 recessed in the outer wall direction of the guide sleeve 21 with respect to the guide sleeve engagement surface 215, the grooves 211 are the aforementioned recessed portions (first rotation stop portions) for concave-convex engagement with the spool member 4, and the number of the grooves 211 is four in the present embodiment, and the grooves are provided at intervals in the circumferential direction of the guide sleeve 21.

According to the electric valve, the guide sleeve 21 is fixedly connected with the valve body component 1, the valve body component 1 axially positions the guide sleeve 21, the guide sleeve 21 supports the transmission component 3, and the guide sleeve 21 further limits circumferential rotation of the valve core component 4. Therefore, the guide sleeve 21 has multiple functions, the number of parts of the electric valve can be reduced, and in addition, the guide sleeve 21 partially extends into the rotor 33, so that the whole structure of the electric valve can be more compact.

As shown in fig. 3, the core member 4 includes an internal cavity 40, the internal cavity 40 being located between the threaded shaft 31 and the valve head member 42. In fig. 3, the inner cavity 40 is generally defined by the lower surface of the threaded shaft 31, the inner wall of the connecting member 41, and the upper surface of the valve head member 42. After the electric valve is applied to the system, the fluid in the system can flow into the inner cavity 40 through the gap between the inner wall of the guide sleeve 21 and the outer wall of the valve core part 4. It will be appreciated that the volume of the internal chamber 40 is variable during axial movement of the spool member 4 by the threaded shaft 31. As the volume of the lumen 40 decreases. The pressure of the fluid in the cavity 40 will increase, which will generate an acting force that is not beneficial to the opening of the electric valve, and will affect the reliability of the operation of the electric valve core component 4. For this purpose. As shown in fig. 3, a communication passage is provided between the valve head member 42 and the connection member 41, the valve head member 42 may be provided with a communication passage, and the connection member 41 may be provided with a communication passage that communicates the inner cavity 40 with the outside of the valve body member 4, and the flow rate of the communication passage is larger than the flow rate between the internal thread portion 411 and the external thread portion 311. Therefore, the pressure in the internal cavity 40 is preferentially released through the communication passage, and is not merely released through the thread clearance between the internal thread portion 411 and the external thread portion 311, thereby improving the operational reliability of the valve core member 4 during the opening of the electric valve.

The arrangement of the communication passage in the first embodiment will be described in detail below. As shown in fig. 3, the connection part 41 includes a first connection piece 413 and a second connection piece 414. The first connector 413 is at least partially located within the guide sleeve 21. The first connector 413 is slidably engaged with the guide sleeve 21. The first connection piece 413 is made of a non-metal material, which can facilitate shape processing of the first connection piece 413 and reduce abrasion between the first connection piece 413 and the guide sleeve 21 and between the first connection piece 413 and the threaded shaft 31. The second connecting member 414 is made of a metal material, and the second connecting member 414 is fixed to the first connecting member 413 by injection molding. The first connector 413 includes the aforementioned internal thread portion 411, the lower end of the threaded shaft 31 extends into the internal thread portion 411, and the external thread portion 311 of the threaded shaft 31 is in threaded connection with the internal thread portion 411 so that the threaded shaft 31 can drive the valve core member 4 to move away from or close to (including abutting against) the valve port portion 1220.

As shown in fig. 5, the first connecting member 413 includes the valve element matching surface 4134, an outer edge contour of the valve element matching surface 4134 is circular, the first connecting member 413 includes the first matching portion, the first matching portion has a plurality of protrusions 412 protruding radially relative to the valve element matching surface 4134, the plurality of protrusions 412 are protrusions matching with the recesses of the guide sleeve 21, herein, the protrusions 412 are ribs along the first connecting member, the number of the protrusions 412 corresponds to the number of the grooves 211, and in the present embodiment, four protrusions are provided.

The valve head part 42 includes a valve head 421 and a sealing ring 422, the valve head 421 is made of metal material, and the valve head 421 is welded to the second connector 413, or is in interference fit or threaded connection. In this embodiment, the valve head 421 includes an insertion portion 4210, the second connector 414 includes a socket 4141, and the insertion portion 4210 is at least partially located in the socket 4141 and is in interference fit with the hole wall of the socket 4141.

As shown in fig. 3 and 8, the communication passage includes a first passage M between the outer wall of the insertion portion 4210 and the hole wall of the insertion hole 4141.

As shown in fig. 3, 4 and 8, the insertion portion 4210 has a cylindrical shape with a cut surface 4211, and the insertion hole 4141 includes a straight hole 4142 and a flared hole 4143. The horn hole 4143 has a small upper end and a small lower end, the small end is connected to the lower end of the straight hole 4142, a main passage M1 is formed between the tangent plane 4211 and the wall of the straight hole 4142, and a guide passage M2 is formed between the tangent plane 4211 and the wall of the horn hole 4143. The first passage M includes the aforementioned main passage M1 and guide passage M2. The first passage M is simple in structure and convenient to process. The design of the guide passage M2 can reduce the flow resistance, and make the fluid in the inner cavity 40 flow to the outside of the valve core component 4 through the main passage M1 more easily.

More specifically, as shown in fig. 6 to 8, the second connecting member 414 includes a base portion 4145 provided in the first connecting member 413 and a radial protrusion 4146 provided on a lower side of the second connecting member 414, the base portion 4145 being disposed perpendicular to the radial protrusion 4146, the base portion 4145 being provided with the aforementioned insertion hole 4141. The hole wall of the large-opening end of the bell hole 4143 is connected to the lower surface of the radial projection 4146. The valve head 421 includes a disk 4215, and the disk 4215 is disposed perpendicular to the insert 4210. The upper surface of the disk 4215 faces the lower surface of the radial protrusion 4146, the upper surface of the disk 4215 includes a first plane 4212 and a second plane 4213, and the first plane 4212 is farther from the valve port portion 1220 than the second plane 4213. Thus, the plate 4215 forms a notch 4214, the section 4211 is perpendicular to the second plane 4213, and the lower end of the section 4211 is connected with the second plane 4213. The first passage M is located between the cut surface 4211 and the insertion hole 4141. The communication channel further comprises a second passage N between the second plane 4213 and the radial projection 4146.

On this basis, it can be understood that the specific structural details of the communication channel can be designed more flexibly. The communication passage may be provided with a notch portion only on the valve head 421 so that the notch portion cooperates with the second connector 414 to form the communication passage. Alternatively, the communication passage may be formed by providing a notch portion in the second connector 414 so as to be engaged with the valve head 421, or by forming notch portions in the second connector 414 and the valve head 421 respectively so as to be engaged with the notch portions of the two components.

In this embodiment, the valve port seat 122 is made of a metal material, and in order to achieve good internal leakage performance of the electric valve, as shown in fig. 3, the valve head part 42 further includes a sealing ring 422 made of a soft material, the valve head 421 includes a sealing ring mounting portion 4217 located below the disk portion 4215, the sealing ring mounting portion 4217 is cylindrical, the disk portion 4215 is disc-shaped, a diameter of a lower end surface of the disk portion 4215 is larger than a diameter of the sealing ring mounting portion 4217, the sealing ring 422 is sleeved on an outer peripheral portion of the sealing ring mounting portion 4217, and the sealing ring 422 can abut against or separate from the valve port portion 1220 to close or open the electric valve.

The structure of the communication passage in the electrically operated valve according to the first embodiment of the present application is described in detail above, and the electrically operated valve according to the second embodiment of the present application is formed by modifying the structure of the second connector and the head member without changing the other structure.

As shown in fig. 9, in the present embodiment, the same reference numerals are used for the same components and parts having the same structures as those in the first embodiment. The electric valve includes a valve head part 42A, and the valve head part 42A includes a valve head 421A, an annular fixing seat 423A, and a sealing ring 422 made of a soft material. The valve head 421A penetrates the fixing seat 423A and is riveted or welded with the fixing seat 423A, the fixing seat 423A and the sealing ring 422 are circular, the outer diameter of the lower surface of the fixing seat 423A is larger than that of the sealing ring 422, and the sealing ring 422 is sleeved outside the valve head 421A and is located on the lower side of the fixing seat 423A. The communication passage is located between the fixed seat 423A and the second connector 414A. The valve head 421A and the fixing seat 423A are separately arranged, and compared with the valve head 42 in the first embodiment, one more part is provided, but the axial size of the valve head 421A is reduced by directly fixing the fixing seat 423A and the second connecting piece 414A.

The second connector 414A includes a base 4145A inside the first connector 413 and a receiving portion 4146A outside the first connector 413, the base 4145A is connected to the first connector 413 by injection molding, the receiving portion 4146A includes a stepped hole 4147A facing the valve port 1220 on a stepped surface 4148A, the fixing seat 423A is at least partially located inside the stepped hole 4147A, and the fixing seat 423A is fixed to a hole wall of the stepped hole 4147A by interference fit or welding. The communication passage includes a first passage MA1, and the first passage MA1 is located between the fixed seat 423A and the stepped surface 4148A and between the fixed seat 423A and the hole wall of the stepped hole 4147A. In this case, the specific structure and location of the first path MA1 can be designed to be flexible. The notch portion may be provided only in the fixed base 423A, only in the housing portion 4146A of the second coupling 414A, or in each of the fixed base 423A and the housing portion 4146A of the second coupling 414A. The following description will be made only by providing the notch portion in the fixed base 423A.

As shown in fig. 9 and 10, the inner cavity 40A is located between the threaded shaft 31 and the valve head member 42A, the fixed seat 423A includes an upper cutout portion 4231A and a side cutout portion 4232A, the upper cutout portion 4231A is provided perpendicular to the side cutout portion 4232A, an upper surface of the upper cutout portion 4231A is provided opposite to the stepped surface 4148A, a side surface of the side cutout portion 4232A is provided opposite to a hole wall of the stepped hole 4147A, and the first passage MA1 is located between the upper surface of the upper cutout portion 4231A and the stepped surface 4148A and between the side surface of the side cutout portion 4243A and the hole wall of the stepped hole 4147A, so that the first passage MA1 is easy to machine.

Further, as shown in fig. 10, the second connecting member 414 includes a flared hole 4143A with a smaller top and a larger bottom, and the lower end of the wall of the flared hole 4143A is connected to the step surface 4148A, in this embodiment, the flared hole 4143A is a portion of the inner cavity 40A, and guides the fluid flowing from the inner cavity 40A to the first passage MA 1.

As shown in fig. 9 and 10, the guide sleeve 21 includes an upper chamber O located on the upper side of the first connector 413, the electric valve includes a lower chamber P located on the lower side of the guide sleeve 21 in the valve body 1, and an outer chamber Q located between the outer side of the guide sleeve 21 and the valve body 4, the outer chamber Q and the upper chamber O include a first pressure balance hole 210 communicating the outer chamber Q and the upper chamber 0, the first pressure balance hole 210 releases the fluid pressure in the upper chamber O, the outer chamber Q and the lower chamber P include a second pressure balance hole 220 communicating the outer chamber Q and the lower chamber P, and after the outer chamber O and the lower chamber P are communicated by the second pressure balance hole 220, the pressure impact of the fluid entering the lower chamber P on the guide sleeve 21 and the valve core member 4 can be reduced, and the valve core member 4 is prevented from being deflected relative to the valve port 1220, which affects the performance of the electric valve, thereby improving the product reliability of the electric valve. As shown, the first pressure balance hole 210 is a radial through hole formed in the sidewall of the guide sleeve 21, but the specific shape of the first pressure balance hole 210 is not limited.

As shown in fig. 2, 3 and 4, the guide sleeve 21 includes a first annular portion 23 and a second annular portion 24, the second annular portion 24 radially extends from a lower end of the first annular portion 23, the lower valve body 121 includes a positioning step 341 facing the rotor 33, the guide sleeve 21 is seated on the positioning step 341, a cross section of an outer wall of the first annular portion 23 is circular, a cross section of an outer wall of the second annular portion 24 is non-circular, the second annular portion 24 includes a fixing portion 241 seated on the positioning step 341 and a non-fixing portion 242 not contacting the positioning step 341, the non-fixing portion 242 cooperates with the lower valve body 121 to form the second pressure balance hole 220, and the second pressure balance hole 220 is good in manufacturability.

In the embodiment shown in fig. 9, the elastic member 34 is provided between the bearing inner race 321 and the side protrusion 310, the elastic member 34 may be a spring or another member such as an elastic pressing plate, one end of the elastic member 34 abuts against the bearing inner race 321, and the other end of the elastic member abuts against the side protrusion 310. The elastic member 34 is provided to protect the electric valve from being closed, when the valve core member 4 is just in contact with the valve port 1220, and the valve core member 4 continues to move downward, the elastic member 34 is compressed, so as to prevent the threads of the internal thread portion 411 and the external thread portion 30 from being damaged by force, and the reliability of the operation of the electric valve is not affected.

In the above embodiment, it is also possible to make a modification that the communication channel is provided on the connecting part, for example, a groove or other notch is provided on the connecting part as the communication channel to match with the valve head part, which can be understood on the basis of the drawings herein and will not be described with the addition of the drawings.

The electrically operated valve provided in the present application is described above by way of example. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (10)

1. An electric valve is characterized by comprising a valve body component, a guide component, a transmission component and a valve core component, the transmission component comprises a threaded shaft, the threaded shaft comprises an external thread part, the valve core component comprises a connecting component and a valve head component, the connecting member is connected with the valve head member, the connecting member includes an internal threaded portion and a first mating portion, the internal thread part is in threaded connection with the external thread part, the threaded shaft can drive the valve core part to move along the axial direction of the valve body part, the valve head part can be close to or far away from the valve port part of the electric valve, the valve core part comprises an inner cavity, the inner cavity is located between the threaded shaft and the valve head part, a communication channel is arranged between the valve head part and the connecting part, and the communication channel is communicated with the inner cavity and the outside of the valve core part.

2. The electric valve according to claim 1, wherein the guide member comprises a guide sleeve, the guide sleeve is cylindrical, the guide sleeve is directly or indirectly fixedly connected with the valve body member, the connecting member is slidably engaged with the guide sleeve, the guide sleeve comprises a first rotation stop portion, the first rotation stop portion is engaged with the first engagement portion so that the guide sleeve limits circumferential rotation of the valve core member, the flow rate of the communication channel is greater than the flow rate between the internal thread portion and the external thread portion, the connecting member comprises an insertion hole, the valve core member comprises a valve head, the valve head comprises an insertion portion, the insertion portion is at least partially located in the insertion hole, the communication channel comprises a first passage, and the first passage is located between an outer wall of the insertion portion and a hole wall of the insertion hole.

3. The electric valve according to claim 2, wherein the insertion hole comprises a first straight hole and a flared hole with a small top and a large bottom, an upper end of a hole wall of the flared hole is connected with a lower end of the hole wall of the first straight hole, the first passage comprises a main passage and a guide passage, the main passage is located between the hole wall of the first straight hole and the insertion portion, and the guide passage is located between the hole wall of the flared hole and the insertion portion.

4. The electric valve according to claim 3, wherein the connecting member comprises a first connecting member, the valve head further comprises a disc portion disposed perpendicular to the insertion portion, the disc portion comprises a base portion located inside the first connecting member and a radial protrusion portion located outside the first connecting member, a lower end of the trumpet hole is connected with a lower surface of the radial protrusion portion, an upper surface of the disc portion faces a lower surface of the radial protrusion portion, the disc portion comprises a notched portion, and the communication channel comprises a second passage located between the notched portion and the lower surface of the radial protrusion portion.

5. The electric valve according to claim 1, wherein the valve head part comprises a valve head and a fixing seat, the valve head penetrates through the fixing seat, the valve head is riveted or welded with the fixing seat, and the communication channel is located between the fixing seat and the connecting part.

6. The electric valve according to claim 5, wherein the communication passage has a flow rate larger than a flow rate between the internal thread portion and the external thread portion, the communication passage includes a first passage, the connection member includes a receiving portion including a stepped hole with a step surface facing downward, the holder is at least partially located in the stepped hole, the holder has a ring shape, and the first passage is located between the holder and the stepped hole and between the holder and the hole wall of the stepped hole.

7. The electric valve according to claim 6, wherein the guide member comprises a guide sleeve, the connecting member comprises a first connecting member and a second connecting member, the first connecting member is at least partially located in the guide sleeve, the first connecting member is slidably engaged with the guide sleeve, the first connecting member is made of a non-metallic material, the first connecting member comprises the first engaging portion and the internal threaded portion, the second connecting member is made of a metallic material, the second connecting member comprises a base portion located in the first connecting member and the accommodating portion located outside the first connecting member, the head member is welded, or interference-fitted, or threaded with the second connecting member, the fixing base comprises an upper notch portion and a side notch portion, an upper surface of the upper notch portion is disposed opposite to the step surface of the step hole, the side surface of the side notch part is opposite to the hole wall of the stepped hole, and the first passage is positioned between the upper surface of the upper notch part and the stepped surface of the stepped hole and between the side surface of the side notch part and the hole wall of the stepped hole.

8. The electric valve of claim 7, wherein the second connecting member comprises a flared opening with a small upper end and a large lower end, and a lower end hole wall of the flared opening is connected with the step surface of the step hole.

9. The electric valve according to any one of claims 1 to 8, wherein the head member further comprises a sealing ring made of a soft material, the sealing ring is sleeved outside the head, and the sealing ring can abut against or separate from the valve port of the electric valve.

10. The electric valve according to any one of claims 2 to 4 and 7 to 8, wherein the transmission member comprises a bearing and an elastic member, the bearing comprises a bearing inner ring and a bearing outer ring, the threaded shaft penetrates through the bearing, the threaded shaft is in clearance fit or interference fit with the bearing inner ring, the guide sleeve comprises a bearing accommodating part, the bearing is seated in the bearing accommodating part, the guide sleeve is fixedly connected with the bearing outer ring directly or indirectly, one end of the elastic member abuts against the bearing inner ring, and the other end of the elastic member abuts against a side convex part of the threaded shaft.

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