CN210372071U

CN210372071U - Electronic expansion valve

Info

Publication number: CN210372071U
Application number: CN201920610538.2U
Authority: CN
Inventors: 贺宇辰; 许学飞; 裴俊峰
Original assignee: SUZHOU HUAYUE METAL CO Ltd
Current assignee: SUZHOU HUAYUE METAL CO Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-04-21
Anticipated expiration: 2029-04-29

Abstract

The utility model provides an electronic expansion valve, include: the valve seat is provided with an inlet, an outlet and a communication channel communicated with the inlet and the outlet; the actuator is movably arranged in the valve seat; the driving mechanism is connected with the actuating mechanism; the driving mechanism comprises a guide sleeve and a first noise reduction piece, the guide sleeve is located in the valve seat, the actuating mechanism is at least partially arranged in the guide sleeve, and the first noise reduction piece is arranged between the guide sleeve and the actuating mechanism. The technical scheme of the utility model the electronic expansion valve among the prior art has been solved effectively because clearance fit between actuating mechanism and the uide bushing, the problem of noise production between actuating mechanism action in-process and the uide bushing.

Description

Electronic expansion valve

Technical Field

The utility model relates to a technical field of valve particularly, relates to an electronic expansion valve.

Background

At present, an electronic expansion valve is widely used for throttling and flow regulation of fluid, and the electronic expansion valve utilizes the principle of a stepping motor, a rotor in the electronic expansion valve is driven by a coil to rotate in the forward and reverse directions, and then a valve needle is driven by the rotor to ascend or descend, so that the flow area of the inlet of the valve is changed, and the flow regulation and control are carried out. In the existing electronic expansion valve, because there are a plurality of clearance fit, including the clearance fit between the valve needle and the guide sleeve, when parts such as the valve needle in the valve moves, noise is generated, and abrasion is accelerated.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an electronic expansion valve to solve the problem of noise generation between the actuating mechanism and the guide sleeve in the actuating mechanism operation process due to clearance fit between the actuating mechanism and the guide sleeve in the electronic expansion valve in the prior art.

In order to achieve the above object, the present invention provides an electronic expansion valve, including: the valve seat is provided with an inlet, an outlet and a communication channel communicated with the inlet and the outlet; the actuator is movably arranged in the valve seat; the driving mechanism is connected with the actuating mechanism; the driving mechanism comprises a guide sleeve and a first noise reduction piece, the guide sleeve is located in the valve seat, the actuating mechanism is at least partially arranged in the guide sleeve, and the first noise reduction piece is arranged between the guide sleeve and the actuating mechanism.

Furthermore, the driving mechanism further comprises a rotor, a screw rod, a nut seat and a connecting sleeve assembly, the rotor is connected with the screw rod, the screw rod is arranged in the nut seat in a penetrating mode, the connecting sleeve assembly is located in the guide sleeve, and the screw rod is connected with the executing mechanism through the connecting sleeve assembly.

Further, the guide sleeve comprises a first channel and a second channel which are communicated and coaxial, the first channel is located on one side, away from the inlet, of the second channel, the second channel is communicated with the communication channel of the valve seat, the connecting sleeve assembly is arranged in the first channel, the actuating mechanism is at least partially arranged in the second channel, and the first noise reduction piece is arranged between the wall surface of the second channel and the actuating mechanism.

Further, a first mounting groove is machined in the outer wall of the actuating mechanism and/or the wall surface of the second channel, and the first noise reduction piece is at least partially mounted in the first mounting groove.

Further, the uide bushing includes uide bushing main part and first briquetting, and first briquetting detachably fixes in the uide bushing main part, and first briquetting has first through-hole, and actuating mechanism wears to establish at least partially in the first through-hole, and first noise reduction spare sets up between uide bushing main part and first briquetting.

Further, the second channel comprises a first sub-channel section, a second sub-channel section and a third sub-channel section in sequence from the direction close to the inlet to the direction far away from the inlet, the diameter of the first sub-channel section is larger than that of the second sub-channel section, the diameter of the second sub-channel section is larger than that of the third sub-channel section, the outer diameter of the actuating mechanism is matched with that of the third sub-channel section, the first pressing block comprises a first stage and a second stage in sequence from the direction far away from the inlet to the direction close to the inlet, the first step section is nested in the first sub-channel section, and the first noise reduction piece is arranged in a space formed by the end face of the first stage, the second sub-channel section and the actuating mechanism.

Further, the uide bushing still includes the briquetting groove, the briquetting groove sets up between first passageway and second passageway, and with the equal coaxial setting of first passageway and second passageway, it has first mounting groove to open on the wall of second passageway near the one side of first passageway, side and briquetting groove intercommunication that first mounting groove is close to the connecting sleeve subassembly, first noise reduction spare sets up in first mounting groove, first briquetting is fixed in the briquetting inslot, move to the direction that is close to the connecting sleeve subassembly in order to prevent first noise reduction spare.

Further, an annular groove is formed in one side, away from the connecting sleeve assembly 35, of the guide sleeve main body 41, the annular groove is connected with a first communicating channel, the first pressing block 42 is installed in the annular groove, the first pressing block 42 comprises a second channel, the second channel is communicated with the first channel, the actuating mechanism 20 at least partially penetrates through the first channel, the first channel and the actuating mechanism 20 are in clearance fit, a first installation groove is formed in the wall surface of the second channel, and the first noise reduction piece 33 is at least partially installed in the first installation groove.

Further, the driving mechanism further comprises a second noise reduction piece, and the second noise reduction piece is arranged between the screw rod and the nut seat.

Further, the screw rod includes canned paragraph and external screw thread section, and the canned paragraph is located one side of keeping away from actuating mechanism of external screw thread section, and the nut seat includes internal thread section and unthreaded hole section, and the external screw thread section cooperates with the internal thread section, and the canned paragraph sets up with unthreaded hole section corresponding.

Further, a second mounting groove is machined in the outer wall of the fixing section and/or the inner wall of the unthreaded hole section, and the second noise reduction piece is at least partially mounted in the second mounting groove.

Further, the nut seat further comprises a second pressing block, the second pressing block is detachably arranged on one side, away from the actuating mechanism, of the unthreaded hole section, a second mounting groove is machined in the end face, connected with the second pressing block, of the unthreaded hole section, and the second noise reduction piece is at least partially mounted in the second mounting groove.

Use the technical scheme of the utility model, electronic expansion valve includes disk seat, actuating mechanism and actuating mechanism, including import, export and with the intercommunication passageway of import, export intercommunication in the disk seat, actuating mechanism and actuating mechanism link to each other to make actuating mechanism can reciprocate. Fluid enters the electronic expansion valve from the inlet, and the actuating mechanism is driven by the driving mechanism to plug or avoid the communication channel to different degrees, so that the electronic expansion valve is closed or opened to different degrees. The driving mechanism comprises a guide sleeve, the actuating mechanism is at least partially arranged in the guide sleeve, the actuating mechanism and the guide sleeve are in clearance fit, and a first noise reduction piece is arranged between the guide sleeve and the actuating mechanism, so that the actuating mechanism can run more stably, and collision and noise are reduced. The technical scheme of the utility model the electronic expansion valve among the prior art has been solved effectively because clearance fit between actuating mechanism and the uide bushing, the problem of noise production between actuating mechanism action in-process and the uide bushing.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic cross-sectional view of a first embodiment of an electronic expansion valve according to the present invention; and

FIG. 2 shows an enlarged partial schematic view of the embodiment of the electronic expansion valve shown in FIG. 1 at A;

fig. 3 is a schematic cross-sectional view showing another structure (i.e., embodiment six) of the electronic expansion valve shown in fig. 1;

fig. 4 shows a schematic cross-sectional view of an embodiment two of the electronic expansion valve according to the present invention;

fig. 5 shows a schematic cross-sectional view of an embodiment five of an electronic expansion valve according to the invention;

fig. 6 shows a schematic cross-sectional view of an embodiment seven of the electronic expansion valve as shown in fig. 5;

fig. 7 shows a schematic top view of the electronic expansion valve shown in fig. 1.

Wherein the figures include the following reference numerals:

10. a valve seat; 11. an inlet; 12. an outlet; 13. a communication channel; 20. an actuator; 21. a fixed part; 22. a limiting part; 23. a guide portion; 24. a throttle section; 30. a drive mechanism; 31. a screw; 311. a fixed section; 312. an external threaded section; 313. a guide section; 314. a limiting section; 32. a nut seat; 321. an internal thread section; 322. a smooth hole section; 323. an open slot; 324. a second pressing block; 33. a first noise reduction member; 34. a second noise reduction member; 35. a connecting sleeve assembly; 351. a spring housing; 352. a gasket; 353. A bearing; 354. pressing the sleeve; 355. a spring; 36. a rotor; 40. a guide sleeve; 41. a guide sleeve main body; 42. a first pressing block; 50. a housing.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, 2 and 7, an electronic expansion valve according to a first embodiment includes: the valve seat 10, the actuator 20, the driving mechanism 30, the guide sleeve 40 and the first noise reduction member 33 the valve seat 10 has an inlet 11, an outlet 12 and a communication passage 13 communicating with the inlet 11 and the outlet 12; the actuator 20 is movably mounted in the valve seat 10; the driving mechanism 30 is connected with the actuating mechanism 20; the guide sleeve 40 is located in the valve seat 10, the actuator 20 is at least partially disposed in the guide sleeve 40, and the first noise reduction member 33 is disposed between the guide sleeve 40 and the actuator 20.

According to the technical scheme of the first application embodiment, the electronic expansion valve comprises a valve seat, an execution mechanism and a driving mechanism, wherein the valve seat comprises an inlet, an outlet and a communication channel communicated with the inlet and the outlet, and the driving mechanism is connected with the execution mechanism so that the execution mechanism can move up and down. Fluid enters the electronic expansion valve from the inlet, and the actuating mechanism is driven by the driving mechanism to plug or avoid the communication channel to different degrees, so that the electronic expansion valve is closed or opened to different degrees. The driving mechanism 30 comprises a guide sleeve, the actuating mechanism is at least partially arranged in the guide sleeve, the actuating mechanism and the guide sleeve are in clearance fit, and a first noise reduction piece is arranged between the guide sleeve and the actuating mechanism, so that the actuating mechanism can run more stably, and collision and noise are reduced. The technical scheme of the first embodiment effectively solves the problem that noise is generated between the actuating mechanism and the guide sleeve in the action process of the actuating mechanism due to the clearance fit between the actuating mechanism and the guide sleeve in the electronic expansion valve in the prior art.

As shown in fig. 1 and fig. 2, in the technical solution of the first embodiment, the driving mechanism 30 further includes a rotor 36, a screw 31, a nut seat 32, and a connecting sleeve assembly 35, the rotor 36 is connected to the screw 31, the screw 31 is inserted into the nut seat 32, the connecting sleeve assembly 35 is located in the guiding sleeve 40, and the screw 31 is connected to the actuator 20 through the connecting sleeve assembly 35. The connecting sleeve assembly 35 includes a spring sleeve 351, a gasket 352, a bearing 353, a pressing sleeve 354 and a spring 355, the actuator 20 is a valve needle, the valve needle includes a fixing portion 21, a limiting portion 22, a guiding portion 23 and a throttling portion 24, the screw 31 further includes a guiding section 313 and a limiting section 314, a first end of the spring 355 abuts against the limiting section 314 of the screw 31, a second end of the spring 355 abuts against the gasket 352, and the fixing portion 21 of the valve needle is connected with the gasket 352. The spring sleeve 351 is sleeved outside the spring 355, a through hole is formed in the upper end of the spring sleeve 351, the guide section 313 of the screw 31 penetrates through the through hole, the diameter of the limiting portion 22 of the valve needle is larger than that of the fixing portion 21, a bearing 353 is arranged between the limiting portion 22 and the gasket 352, and the bearing 353 can prevent the throttling portion 24 from rotating relative to the communicating channel 13 when contacting with the communicating channel 13 so as to prevent the communicating channel 13 and the throttling portion 24 from being worn. The lower end of the spring housing 351 is provided with a press housing 354. The middle part of the pressing sleeve 354 is provided with a through hole, the guide part 23 of the valve needle penetrates out of the through hole and is positioned in the second channel of the guide sleeve 40, the pressing sleeve 354 limits the limiting part 22 of the valve needle in the spring sleeve 351, the valve needle limiting part 22 and the pressing sleeve 354 are provided with axial clearance, and when the valve needle is positioned at the position for blocking the communication channel 13, the valve needle cannot rotate. The throttling part 24 of the valve needle is matched with the communicating channel 13 of the valve seat 10, the connecting sleeve component 35 drives the valve needle to move upwards, the throttling part 24 can avoid the communicating channel 13, fluid can pass through the electronic expansion valve, the connecting sleeve component 35 drives the valve needle to move downwards, the throttling part 24 can block the communicating channel 13, the throttling part 24 gradually enlarges from one end close to the communicating channel 13 to one end far away from the communicating channel 13, when the throttling part 24 blocks the communicating channel 13, the throttling part 24 is different from the diameter matched with the communicating channel 13, and the flow area of the communicating channel 13 is different.

As shown in fig. 1, in the first embodiment, the guide sleeve 40 includes a first channel and a second channel which are communicated and coaxial, the first channel is located on one side of the second channel far from the inlet 11, the second channel is communicated with the communication channel 13 of the valve seat 10, the connecting sleeve assembly 35 is arranged in the first channel, the actuator 20 is at least partially arranged in the second channel, and the first noise reduction member 33 is arranged between the wall surface of the second channel and the actuator 20. The connecting sleeve assembly 35 can move in the first channel, the actuating mechanism 20 can move in the second channel, the actuating mechanism 20 and the second channel are in clearance fit, the first noise reduction piece 33 is in interference fit in the horizontal direction, and the first noise reduction piece 33 is tightly extruded between the second channel and the actuating mechanism 20, so that the actuating mechanism 20 can run more stably in the second channel, and collision and noise are reduced.

As shown in fig. 1 and 2, in the first embodiment, a first mounting groove is formed on an outer wall of the actuator 20 and/or a wall surface of the second passage, and the first noise reduction member 33 is at least partially mounted in the first mounting groove. Specifically, the first mounting groove is machined on the outer wall of the guide portion 23 of the actuator 20, or the first mounting groove is machined on the wall surface of the second channel, or both the outer wall of the guide portion 23 and the wall surface of the second channel, and the first mounting groove is generally an annular groove which is easy to machine, but the first mounting groove may also be machined into a groove of other shapes, such as a spiral shape. The first fitting groove restricts the axial movement of the first noise reduction member 33, and the first noise reduction member 33 cannot be moved freely when the spring housing 351 is moved up and down. The first noise reduction member 33 is an elastic O-ring or piston bowl, which is easily available, does not require separate design and machining, and is inexpensive. Of course, the first noise reduction member 33 may have other shapes, but the shape of the first noise reduction member 33 is adapted to the shape of the first mounting groove, and the frictional force of the first noise reduction member 33 is not so large as to ensure smooth movement of the spring housing 351. The first noise reduction member 33 is generally made of rubber, which is cheap and has certain elasticity, so that the first noise reduction member can be tightly clamped between the guide sleeve 40 and the actuator 20 without damaging the actuator 20 and the guide sleeve 40.

As shown in fig. 4, the second embodiment is different from the first embodiment in that the driving mechanism 30 further includes a second noise reduction member 34, and the second noise reduction member 34 is disposed between the screw 31 and the nut seat 32. The electronic expansion valve further comprises a shell 50, the shell 50 is welded with the valve seat 10, a rotor 36 is arranged in the shell 50, the rotor 36 comprises a permanent magnet, the rotor 36 is fixedly connected with the screw 31, the nut seat 32 is fixed on the valve seat 10, a coil is wound outside the shell 50, and magnetic attraction or repulsion between a magnetic pole of the rotor 36 and a magnetic pole induced by the coil is generated, so that the rotor 36 rotates and further drives the screw 31 to rotate, and the screw 31 and the nut seat 32 are in threaded connection, so that the screw 31 can move up and down while rotating, and the actuating mechanism 20 is driven to move up and down, and of course, the rotor 36 can also move up and down while the screw 31 moves up and down. The second noise reduction member 34 is disposed between the screw bar 31 and the nut holder 32, thereby making the operation of the screw bar 31 more smooth to reduce noise generated when the screw bar 31 and the rotor 36 are operated.

As shown in fig. 4, in the second embodiment, the screw 31 includes a fixed section 311 and an external threaded section 312, the fixed section 311 is located on a side of the external threaded section 312 away from the actuator 20, the nut seat 32 includes an internal threaded section 321 and an unthreaded section 322, the external threaded section 312 is matched with the internal threaded section 321, and the fixed section 311 is disposed corresponding to the unthreaded section 322. The fixed section 311 is connected to the rotor 36, and the external thread section 312 is matched with the internal thread section 321 to move the screw 31 up and down, so that the screw 31 drives the actuator 20 to move. The nut holder 32 further includes an open groove 323, the open groove 323 is connected to the internal thread section 321, and the upper portion of the connecting sleeve assembly 35 is clamped in the open groove 323, the diameter of the open groove 323 is larger than that of the internal thread section 321, when the screw 31 descends, the lower portion of the external thread section 312 of the screw 31 can enter the open groove 323 and move up and down in the open groove 323.

As shown in fig. 4, in the second embodiment, a second mounting groove is formed on an outer wall of the fixing section 311 and/or an inner wall of the unthreaded hole section 322, and the second noise reduction member 34 is at least partially mounted in the second mounting groove. The second mounting groove may be machined on the outer wall of the fixed segment 311, or on the inner wall of the unthreaded hole segment 322, or on the outer wall of the fixed segment 311 and the inner wall of the unthreaded hole segment 322, and the second mounting groove is generally an annular groove, which is easy to machine, although the second mounting groove may also be machined into grooves of other shapes, such as a spiral shape. The second mounting groove restricts the axial movement of the second noise reduction member 34, and the second noise reduction member 34 cannot be moved freely when the screw 31 is moved up and down. The second noise reduction member 34 is a resilient O-ring or piston bowl that is readily available, does not require separate design and machining, and is inexpensive. Of course, the second noise reduction member 34 may have other shapes, but the shape of the second noise reduction member 34 is adapted to the shape of the second mounting groove, and the frictional force generated by the second noise reduction member 34 is not so large as to ensure smooth movement of the spring housing 351. The second noise reduction member 34 is generally made of rubber, which is cheap and has certain elasticity, so that the second noise reduction member can be tightly clamped between the screw 31 and the nut seat 32 without damaging the screw 31 and the nut seat 32.

As shown in fig. 5, the third embodiment is different from the first embodiment in that the guide sleeve 40 includes a guide sleeve main body 41 and a first pressing piece 42, the first pressing piece 42 is detachably fixed to the guide sleeve main body 41, the first pressing piece 42 has a first through hole, the actuator 20 is at least partially inserted into the first through hole, and the first noise reduction member 33 is disposed between the guide sleeve main body 41 and the first pressing piece 42. The first through hole and the second channel are coaxially arranged and have the same inner diameter. First press block 42 may be secured by bonding or welding or an interference fit, or may be secured using a bolt structure.

As shown in fig. 5, in the third technical solution of the embodiment, the second passage includes a first sub-passage section, a second sub-passage section and a third sub-passage section in sequence from the direction close to the inlet 11 to the direction far from the inlet 11, the diameter of the first sub-passage section is larger than that of the second sub-passage section, the diameter of the second sub-passage section is larger than that of the third sub-passage section, the outer diameter of the actuator 20 is matched with that of the third sub-passage section, the first pressing block 42 includes a first stage and a second stage in sequence from the direction far from the inlet 11 to the direction close to the inlet 11, the first stage is nested in the first sub-passage section, and the first noise reduction member 33 is disposed in a space formed by the end surface of the first stage, the second sub-passage section and the actuator 20. The space formed by the end surface of the first stage, the second channel section and the actuator 20 is the first mounting recess. The first noise reduction member 33 is mounted in the first recess. The first mounting recess restricts the axial movement of the first noise reduction member 33, and the first noise reduction member 33 is interference-fitted in the horizontal direction so that the first noise reduction member 33 is tightly pressed between the guide sleeve 40 and the actuator 20, thereby reducing the impact and noise, and the first noise reduction member 33 is generally a resilient O-ring or piston bowl. The first noise reduction member 33 is first fitted into the first fitting groove and then the first presser block 42 is fitted and fixed, which makes it easier to assemble the first noise reduction member 33.

As shown in fig. 4 and 5, the technical solution of the fourth embodiment is different from the technical solution of the second embodiment in that the nut seat 32 further includes a second pressing block 324, the second pressing block 324 is detachably disposed on a side of the unthreaded hole section 322 away from the actuator 20, a second mounting groove is machined on an end surface of the unthreaded hole section 322 away from the actuator 20, and the second noise reduction member 34 is at least partially mounted in the second mounting groove. The second mounting groove is an annular opening groove coaxially arranged with the screw 31, the second pressing block 324 seals the opening of the annular opening groove, the second mounting groove is generally an annular groove, the annular groove is easy to process, and the second mounting groove can also be processed into grooves with other shapes, such as a spiral shape. The second mounting groove restricts the axial movement of the second noise damper 34. The second noise reduction member 34 is interference-fitted in the horizontal direction, the second noise reduction member 34 is tightly pressed between the screw bar 31 and the nut holder 32 to reduce collision and noise, and the second noise reduction member 34 is generally a resilient O-ring or piston bowl. The second noise reduction member 34 is first fitted into the second fitting groove and then the second pressing piece 324 is fitted and fixed, which makes it easier to assemble the second noise reduction member 34. The second pressing block 324 may be fixed by interference fit with the nut seat 32, may be fixed by adhesion or welding, and may be fixed by a snap structure or a bolt structure.

As shown in fig. 5, the fifth embodiment is different from the fourth embodiment in that the second passage includes a first passage section, a second passage section and a third passage section in sequence from a direction close to the inlet 11 to a direction away from the inlet 11, the diameter of the first passage section is greater than that of the second passage section, the diameter of the second passage section is greater than that of the third passage section, the outer diameter of the actuator 20 is matched with that of the third passage section, the first pressing block 42 includes a first stage and a second stage in sequence from a direction away from the inlet 11 to a direction close to the inlet 11, the first stage is nested in the first passage section, and the first noise reduction member 33 is disposed in a space formed by an end face of the first stage, the second passage section and the actuator 20. The space formed by the end surface of the first stage, the second channel section and the actuator 20 is the first mounting recess. The first noise reduction member 33 is mounted in the first recess. The first mounting recess restricts the axial movement of the first noise reduction member 33, and the first noise reduction member 33 is interference-fitted in the horizontal direction so that the first noise reduction member 33 is tightly pressed between the guide sleeve 40 and the actuator 20, thereby reducing the impact and noise, and the first noise reduction member 33 is generally a resilient O-ring or piston bowl. The first noise reduction member 33 is first fitted into the first fitting groove and then the first presser block 42 is fitted and fixed, which makes it easier to assemble the first noise reduction member 33. The first pressing block 42 may be fixed by bonding or welding, or may be fixed by providing a snap structure or using a bolt structure.

As shown in fig. 3, the difference between the sixth embodiment and the third embodiment is that the guide sleeve 40 further includes a pressing block groove, the pressing block groove is disposed between the first channel and the second channel and is disposed coaxially with the first channel and the second channel, a first mounting groove is opened on a wall surface of the second channel near one side of the first channel, a side surface of the first mounting groove near the connecting sleeve assembly 35 is communicated with the pressing block groove, the first noise reduction member 33 is disposed in the first mounting groove, and the first pressing block 42 is fixed in the pressing block groove to prevent the first noise reduction member 33 from moving toward the direction near the connecting sleeve assembly 35. The second mounting groove is typically an annular groove that is easy to machine, although the second mounting groove can be machined in other shapes, such as a spiral. The second mounting groove restricts the axial movement of the second noise damper 34. The second noise reduction member 34 is interference-fitted in the horizontal direction, the second noise reduction member 34 is tightly pressed between the screw bar 31 and the nut holder 32 to reduce collision and noise, and the second noise reduction member 34 is generally a resilient O-ring or piston bowl. The first noise reduction member 33 is first fitted into the first fitting groove and then the first presser block 42 is fitted and fixed, which makes it easier to assemble the first noise reduction member 33. The first pressing block 42 may be fixed by interference fit with the pressing block groove, may be fixed by bonding or welding, and may be fixed by a snap structure or by a bolt structure.

As shown in fig. 6, the seventh embodiment is different from the fourth embodiment in that an annular groove is formed on a side of the guide sleeve main body 41 away from the connecting sleeve assembly 35, the annular groove is connected with a first communicating channel, the first pressing block 42 is installed in the annular groove, the first pressing block 42 comprises a second channel, the second channel is communicated with the first channel, the actuator 20 is at least partially inserted into the first channel, the first channel is in clearance fit with the actuator 20, a first installation groove is formed on a wall surface of the second channel, the first noise reduction member 33 is at least partially installed in the first installation groove, the second installation groove is generally an annular groove which is easy to machine, and the second installation groove can also be machined into grooves with other shapes, such as a spiral shape. The second mounting groove restricts the axial movement of the second noise damper 34. The second noise reduction member 34 is interference-fitted in the horizontal direction, the second noise reduction member 34 is tightly pressed between the screw bar 31 and the nut holder 32 to reduce collision and noise, and the second noise reduction member 34 is generally a resilient O-ring or piston bowl. The first noise reduction member 33 is first fitted into the first fitting groove and then the first presser block 42 is fitted and fixed, which makes it easier to assemble the first noise reduction member 33. The first pressing block 42 may be fixed by interference fit with the annular groove, may be fixed by bonding or welding, and may be fixed by a snap structure or by a bolt structure.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve comprising:

a valve seat (10), the valve seat (10) having an inlet (11), an outlet (12) and a communication passage (13) communicating with the inlet (11) and the outlet (12);

an actuator (20), said actuator (20) being movably mounted within said valve seat (10);

a drive mechanism (30), wherein the drive mechanism (30) is connected with the actuating mechanism (20);

it is characterized in that the preparation method is characterized in that,

the drive mechanism (30) comprises a guide sleeve (40) and a first noise reduction piece (33), the guide sleeve (40) is positioned in the valve seat (10), the actuating mechanism (20) is at least partially arranged in the guide sleeve (40), and the first noise reduction piece (33) is arranged between the guide sleeve (40) and the actuating mechanism (20).

2. An electronic expansion valve according to claim 1, wherein the driving mechanism (30) further comprises a rotor (36), a screw rod (31), a nut seat (32) and a connecting sleeve assembly (35), the rotor (36) is connected with the screw rod (31), the screw rod (31) is inserted into the nut seat (32), the connecting sleeve assembly (35) is located in the guiding sleeve (40), and the screw rod (31) is connected with the actuating mechanism (20) through the connecting sleeve assembly (35).

3. An electronic expansion valve according to claim 2, wherein the guide sleeve (40) comprises a first and a second communicating and coaxial channel, the first channel being located at a side of the second channel remote from the inlet (11), the second channel being in communication with the communication channel (13) of the valve seat (10), the connecting sleeve assembly (35) being arranged in the first channel, the actuator (20) being at least partly arranged in the second channel, the first noise-reducing member (33) being arranged between a wall surface of the second channel and the actuator (20).

4. An electronic expansion valve according to claim 3, wherein the actuator (20) has a first mounting recess machined in an outer wall thereof and/or in the second passage wall surface, the first noise-reducing member (33) being at least partially mounted in the first mounting recess.

5. An electronic expansion valve according to claim 3, wherein the guide sleeve (40) comprises a guide sleeve main body (41) and a first pressure piece (42), the first pressure piece (42) is detachably fixed on the guide sleeve main body (41), the first pressure piece (42) has a first through hole, the actuator (20) is at least partially inserted into the first through hole, and the first noise reduction member (33) is disposed between the guide sleeve main body (41) and the first pressure piece (42).

6. An electronic expansion valve according to claim 5, wherein the second passage comprises in sequence a first passage section, a second passage section and a third passage section from near the inlet (11) to far away from the inlet (11), the diameter of the first channel subsection being greater than the diameter of the second channel subsection, the diameter of the second channel subsection being greater than the diameter of the third channel subsection, the outer diameter of the actuating mechanism (20) is matched with the third branch channel section, the first pressing block (42) sequentially comprises a first stage and a second stage from the direction far away from the inlet (11) to the direction close to the inlet (11), the first step section is nested in the first sub-channel section, and the first noise reduction piece (33) is arranged in a space formed by the end face of the first stage, the second sub-channel section and the actuating mechanism (20).

7. The electronic expansion valve according to claim 5, wherein the guide sleeve (40) further comprises a pressing block groove, the pressing block groove is disposed between the first passage and the second passage and is disposed coaxially with both the first passage and the second passage, a first mounting groove is opened on a wall surface of the second passage near a side of the first passage, a side surface of the first mounting groove near the connecting sleeve assembly (35) communicates with the pressing block groove, the first noise reduction member (33) is disposed in the first mounting groove, and the first pressing block (42) is fixed in the pressing block groove to prevent the first noise reduction member (33) from moving in a direction near the connecting sleeve assembly (35).

8. An electronic expansion valve according to claim 5, wherein the side of the guide sleeve body (41) remote from the connecting sleeve assembly (35) is provided with an annular groove, the annular groove is connected with the first passage, the first pressure block (42) is mounted in the annular groove, the first pressure block (42) comprises a second passage, the second passage is communicated with the first passage, the actuator (20) is at least partially inserted into the first passage, the first passage is in clearance fit with the actuator (20), a first mounting groove is formed on the wall surface of the second passage, and the first noise reduction member (33) is at least partially mounted in the first mounting groove.

9. An electronic expansion valve according to claim 2, wherein the drive mechanism (30) further comprises a second noise-reducing member (34), the second noise-reducing member (34) being arranged between the screw (31) and the nut seat (32).

10. The electronic expansion valve according to claim 9, wherein the screw rod (31) comprises a fixed section (311) and an external threaded section (312), the fixed section (311) is located on a side of the external threaded section (312) away from the actuator (20), the nut seat (32) comprises an internal threaded section (321) and a light hole section (322), the external threaded section (312) is matched with the internal threaded section (321), and the fixed section (311) is arranged corresponding to the light hole section (322).

11. An electronic expansion valve according to claim 10, wherein the outer wall of the stationary section (311) and/or the inner wall of the light aperture section (322) is/are provided with a second mounting recess, in which the second noise damper (34) is at least partially mounted.

12. The electronic expansion valve according to claim 10, wherein the nut seat (32) further comprises a second pressing block (324), the second pressing block (324) is detachably disposed on a side of the light hole section (322) far away from the actuator (20), a second mounting groove is processed on an end surface of the light hole section (322) connected with the second pressing block (324), and the second noise reduction member (34) is at least partially mounted in the second mounting groove.