CN219827739U - Electronic expansion valve - Google Patents
Electronic expansion valve Download PDFInfo
- Publication number
- CN219827739U CN219827739U CN202321323692.4U CN202321323692U CN219827739U CN 219827739 U CN219827739 U CN 219827739U CN 202321323692 U CN202321323692 U CN 202321323692U CN 219827739 U CN219827739 U CN 219827739U
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- Prior art keywords
- valve
- small
- electronic expansion
- port
- needle
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- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 15
- 230000000903 blocking effect Effects 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Lift Valve (AREA)
Abstract
The utility model provides an electronic expansion valve, which comprises a valve seat part and a valve sleeve, wherein the valve sleeve is connected with the valve seat part, the electronic expansion valve further comprises a valve needle part and a driving part, the valve needle part is arranged in the valve seat part, the valve needle part comprises a piston and a small valve needle, the piston is provided with a small valve port, a side opening and a balance hole, the tail end of the small valve needle is solid, the small valve needle is movably arranged to adjust the opening degree of the small valve port or close the small valve port, the side opening is positioned at one side of the small valve port facing the big valve port, the side opening is communicated with the small valve port, and the balance hole is communicated with the upper surface and the lower surface of the piston; therefore, a sealing ring on the outer wall of the small valve needle is eliminated, and the reliability of the electronic expansion valve is improved.
Description
Technical Field
The utility model relates to the field of automobile air conditioners, in particular to an electronic expansion valve.
Background
In the prior art, as in chinese utility model 202220249839.9, there is provided an electronic expansion valve comprising: the valve seat component is connected with the valve sleeve; the valve needle component is arranged in the valve seat component and comprises a main body part and a small valve needle, the main body part is provided with a small valve port, and the small valve needle is movably arranged to adjust the opening degree of the small valve port; the driving component is arranged in the cavity of the valve seat component and the valve sleeve, a rotor cavity is formed in the region between the structure of the driving component in the valve sleeve and the inner wall of the valve sleeve, and the driving component is in driving connection with the small valve needle; and the balance channel is used for communicating the rotor cavity with the small valve port. The valve needle component further comprises a first inner sealing ring and a second inner sealing ring, wherein the first inner sealing ring is located between the outer wall of the valve needle and the inner wall of the main body, and the second inner sealing ring is located between the outer wall of the main body and the inner wall of the valve seat component. By arranging the first inner sealing ring, the tightness between the outer wall of the small valve needle and the inner wall of the main body part is ensured; and a second inner sealing ring is arranged to ensure the tightness between the outer wall of the main body part and the inner wall of the valve seat part. However, the movement of the valve needle is relatively frequent, and the long-time dynamic friction between the first inner sealing ring and the valve needle causes the sealing ring to fail, so that the internal leakage of the refrigerant is seriously exceeded.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide an electronic expansion valve.
The technical scheme of the utility model is as follows: the electronic expansion valve comprises a valve seat part and a valve sleeve, wherein the valve sleeve is connected with the valve seat part, and is characterized by further comprising a valve needle part and a driving part, wherein the valve needle part is arranged in the valve seat part, the valve seat part is provided with a large valve port, the valve needle part comprises a piston and a small valve needle, the piston is provided with a small valve port, a side opening and a balance hole, the tail end of the small valve needle is solid, the small valve needle is movably arranged to adjust the opening degree of the small valve port or close the small valve port, the side opening is positioned at one side of the small valve port facing the large valve port, the side opening is communicated with the small valve port, and the balance hole is communicated with the upper surface and the lower surface of the piston; the driving part is arranged in the cavity of the valve seat part and the valve sleeve, a rotor cavity is formed in the area between the driving part and the inner wall of the valve sleeve, and the driving part is in driving connection with the small valve needle; the side wall of the valve seat component is provided with a flow hole, the big valve port and the small valve port are coaxially arranged, and the piston is movably arranged to open and close the big valve port.
Further, the balance holes have 1 or more, and the total flow area of the balance holes is not less than 3 times of the maximum flow area of the small valve port.
Further, the side openings have 1 or more, and the total flow area of the side openings is not less than 3 times the maximum flow area of the small valve port.
Further, the piston comprises an upper cover part and a body, and the upper cover part is fixedly connected with the body in an interference fit manner.
Further, the valve needle member further includes a first inner seal ring located between the outer wall of the piston and the inner wall of the valve seat member.
Further, the first inner sealing ring is positioned in a groove formed at the joint of the upper cover part and the body.
Further, the valve seat part further comprises an adapter seat and a valve seat, and the valve sleeve, the adapter seat and the valve seat are sequentially connected.
Further, the electronic expansion valve further comprises a first spring, wherein the first spring is sleeved on the outer wall of the small valve needle and is positioned between the adapter seat and the piston.
Further, the drive component includes nut subassembly, screw rod subassembly and rotor part, and rotor part sets up in the valve pocket, and rotor part is used for driving the screw rod subassembly and rotates, and the nut subassembly is located the valve pocket, and the region between the inner wall of nut subassembly and valve pocket forms the rotor chamber, screw rod subassembly and nut subassembly threaded connection, screw rod subassembly and little needle drive connection.
Further, the nut component comprises a nut main body and a connecting plate, the connecting plate is sleeved on the nut main body, and the connecting plate is welded with the adapter seat; the small valve needle comprises a connecting sleeve, the connecting sleeve is fixedly connected with the small valve needle, a screw rod assembly is in threaded connection with a nut assembly, and the screw rod is in limit fit with the connecting sleeve.
The electronic expansion valve comprises a valve seat part, a valve sleeve, a valve needle part, a driving part, a piston, a side opening and a balance hole, wherein the valve needle part is arranged in the valve seat part and comprises a piston and a small valve needle; therefore, a sealing ring on the outer wall of the small valve needle is eliminated, and the reliability of the electronic expansion valve is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a first embodiment of an electronic expansion valve of the present utility model;
FIG. 2 is a schematic illustration of the construction of the parts of the utility model of FIG. 1 except for the drive member and coil assembly;
fig. 3 is a schematic cross-sectional structure of a second embodiment of the electronic expansion valve of the present utility model.
Detailed Description
The technical scheme of the utility model is further specifically described below through examples and with reference to the accompanying drawings. The described embodiments are only some, but not all, embodiments of the utility model. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 2, the present embodiment discloses an electronic expansion valve for use in a refrigerant circuit of an automobile air conditioning system and the like. The electronic expansion valve comprises a valve body 10, a coil assembly 20, a valve seat part 30 and a valve sleeve 1, wherein the valve sleeve 1 is connected with the valve seat part 30, the electronic expansion valve further comprises a valve needle part 40 and a driving part 50, the valve needle part 40 is arranged in the valve seat part 30, the valve needle part 40 comprises a piston 41 and a small valve needle 42, the piston is provided with a small valve port 411, a side opening 412 and a balance hole 413, the tail end of the small valve needle is solid, the small valve needle is movably arranged to adjust the opening degree of the small valve port or close the small valve port, the side opening 412 is positioned at one side of the small valve port facing the big valve port, the side opening is communicated with the small valve port, and the balance hole 413 is communicated with the upper surface and the lower surface of the piston 41; the driving part 50 is arranged in the cavities of the valve seat part 30 and the valve sleeve 1, a rotor cavity is formed in the area between the driving part 50 and the inner wall of the valve sleeve 1, and the driving part 50 is in driving connection with the small valve needle 42; the side wall of the valve seat member 30 has a flow hole 32, the valve seat member has a large valve port 31, the large valve port and the small valve port are coaxially arranged, and a piston 41 is movably arranged to open and close the large valve port. The plunger includes an upper cap portion 414 and a body 415 that are fixedly connected in an interference fit. The valve needle part further comprises a first inner sealing ring 43, the first inner sealing ring 43 being located between the outer wall of the piston and the inner wall of the valve seat part. The first inner seal 43 is located in a groove formed in the upper cover portion, alternatively the first inner seal 43 may be located in a groove formed at the junction of the upper cover portion and the body. The valve body 10 has a first port 101 and a second port 102, the first port 101 communicates with the flow hole 32, and the second port 102 communicates with the large valve port 31.
By adopting the scheme, the rotor cavity and the large valve port are communicated through the balance hole, when the electronic expansion valve works, the pressure of the large valve port and the pressure in the rotor cavity are always consistent, the optimal balance effect inside the electronic expansion valve is ensured, and the problem that the valve is poor due to the fact that the rotor cavity and the large valve port have larger pressure difference is avoided. In the scheme, the driving part drives the small valve needle to move, and the opening of the small valve port is regulated through the movement of the small valve needle, so that the flow regulation function is realized. The sealing ring on the outer wall of the small valve needle is eliminated, and the reliability of the electronic expansion valve is improved.
The valve seat member 30 includes an adapter seat 33 and a valve seat 34, and the valve sleeve 1, the adapter seat 33, and the valve seat 34 are sequentially connected. The driving part 50 comprises a nut assembly 51 and a screw assembly 52 and a rotor part 53, the rotor part 53 is arranged in the valve sleeve 1, the rotor part is used for driving the screw assembly to rotate, the nut assembly is arranged in the valve sleeve, a rotor cavity is formed in an area between the nut assembly and the inner wall of the valve sleeve, the screw assembly is in threaded connection with the nut assembly, and the screw assembly is in driving connection with the small valve needle. The nut assembly is located within the valve housing and the area between the nut assembly and the inner wall of the valve housing forms a rotor cavity.
The nut assembly 51 comprises a nut main body 511 and a connecting plate 512, wherein the connecting plate is sleeved on the nut main body and is welded with the adapter seat; the small valve needle 42 comprises a connecting sleeve 422 and a small valve needle body 421, the connecting sleeve is fixedly connected with the small valve needle body, a screw rod assembly is in threaded connection with a nut assembly, and the screw rod is in limit fit with the connecting sleeve.
Wherein, balance hole 413 and side opening 412 all have 1 or more, and balance hole total flow area is not less than 3 times of little valve port maximum flow area, guarantees that the throttle does not take place for other flow channels except little valve port to influence flow curve. The side of the small valve needle is provided with a first balance hole 423 to ensure the pressure balance of the inner cavity and the outer cavity of the small valve needle. The side surface of the nut component is provided with a second balance hole 513 to ensure the balance of the pressure of the inner cavity and the outer cavity of the nut component.
In this embodiment, the adapter 33 has a piston guide hole and a nut assembly guide hole therein, guiding the piston and nut assembly, ensuring that the piston and small valve are neutral.
The opening degree of the small valve port 411 is adjusted by the axial movement of the small valve needle 42, thereby realizing the adjustment of the small flow rate; the piston 41 is used for blocking or avoiding the large valve port 31 to realize the on-off of large flow. When the electronic expansion valve is in a closed state, the small valve needle 42 seals the small valve port 411, the piston 31 seals the large valve port 31, and no matter the refrigerant is at a transverse interface or a longitudinal interface, the two ends of the piston keep approximately pressure balance, and the two ends of the small valve port still have certain pressure imbalance; when the electronic expansion valve is in a flow regulation state, the small valve needle axially moves to regulate the opening of the small valve port, and the piston seals the large valve port to realize small flow regulation; when the electronic expansion valve is in a full-open state, the piston completely avoids the large valve port, so that the full-open state is realized.
In this embodiment, the valve pin 42 includes a stop rod 424 and a blocking rod 425 that are connected to each other, the radial dimension of the stop rod being greater than the radial dimension of the blocking rod, the stop rod and the piston being in axial stop engagement, the blocking rod being adapted to engage the valve port. The electronic expansion valve first spring 2 is sleeved on the outer wall of the small valve needle and is positioned between the upper cover part of the piston and the body. The small valve needle can also comprise a rolling bearing, a wear-resisting pad, a spring for sealing and the like, and the rolling bearing is fixedly connected with the screw rod and is not described in detail.
Reference 3 shows a further embodiment of the electronic expansion valve, which differs from the first embodiment mainly in that: the electronic expansion valve first spring 2 is sleeved on the outer wall of the small valve needle and is positioned between the adapter 33 and the piston 41; the first inner seal 43 may also be located in a groove formed at the junction of the upper cap portion 414 and the body 415. The remainder refers to the first embodiment.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (9)
1. The electronic expansion valve comprises a valve seat part and a valve sleeve, wherein the valve sleeve is connected with the valve seat part, and is characterized in that the electronic expansion valve also comprises a valve needle part and a driving part, the valve needle part is arranged in the valve seat part, the valve seat part is provided with a large valve port, the valve needle part comprises a piston and a small valve needle, the piston is provided with a small valve port, a side opening and a balance hole, the tail end of the small valve needle is solid, the small valve needle is movably arranged to adjust the opening degree of the small valve port or close the small valve port, the side opening is positioned at one side of the small valve port facing the large valve port, the side opening is communicated with the small valve port, and the balance hole is communicated with the upper surface and the lower surface of the piston; the driving part is arranged in the cavity of the valve seat part and the valve sleeve, a rotor cavity is formed in the area between the driving part and the inner wall of the valve sleeve, and the driving part is in driving connection with the small valve needle; the side wall of the valve seat component is provided with a flow hole, the big valve port and the small valve port are coaxially arranged, and the piston is movably arranged to open and close the big valve port.
2. The electronic expansion valve of claim 1, wherein the balance orifice has 1 or more and the total flow area of the balance orifice is not less than 3 times the maximum flow area of the small valve port.
3. The electronic expansion valve of claim 1, wherein the side openings have 1 or more and the total flow area of the side openings is not less than 3 times the maximum flow area of the small valve port.
4. The electronic expansion valve of claim 1, wherein the piston comprises an upper cap portion and a body, the upper cap portion and the body being fixedly connected in an interference fit.
5. The electronic expansion valve of claim 1, wherein the valve needle member further comprises a first inner seal ring located between the outer wall of the piston and the inner wall of the valve seat member.
6. The electronic expansion valve of claim 4, wherein the valve pin member further comprises a first inner seal ring positioned within a recess formed at the junction of the upper cover portion and the body.
7. The electronic expansion valve of claim 1, wherein the valve seat member further comprises an adapter seat and a valve seat, the valve sleeve, adapter seat and valve seat being connected in sequence.
8. The electronic expansion valve of claim 7, further comprising a first spring, the first spring being sleeved on the outer wall of the valve needle between the adapter and the piston.
9. The electronic expansion valve of claim 1, wherein the drive member comprises a nut assembly, a screw assembly, and a rotor member disposed within the valve housing, the rotor member for driving the screw assembly into rotation, the nut assembly disposed within the valve housing, the region between the nut assembly and the inner wall of the valve housing defining a rotor chamber, the screw assembly threadably coupled to the nut assembly, the screw assembly drivingly coupled to the valve pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321323692.4U CN219827739U (en) | 2023-05-25 | 2023-05-25 | Electronic expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321323692.4U CN219827739U (en) | 2023-05-25 | 2023-05-25 | Electronic expansion valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219827739U true CN219827739U (en) | 2023-10-13 |
Family
ID=88280883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321323692.4U Active CN219827739U (en) | 2023-05-25 | 2023-05-25 | Electronic expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219827739U (en) |
-
2023
- 2023-05-25 CN CN202321323692.4U patent/CN219827739U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |