CN217177430U

CN217177430U - Electronic expansion valve with high-reliability guide sleeve connecting structure

Info

Publication number: CN217177430U
Application number: CN202221062874.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Jiaming New Energy Equipment Co ltd
Current assignee: Zhejiang Jiaming New Energy Equipment Co ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-08-12
Anticipated expiration: 2032-05-06

Abstract

The utility model relates to an electronic expansion valve with a high-reliability guide sleeve connecting structure, which comprises a valve body, wherein the valve body is internally provided with a first cavity, a second cavity and a mounting hole, the first cavity and the second cavity are mutually communicated through a channel, the channel is internally and hermetically connected with a lower valve seat, the mounting port is internally and hermetically connected with an upper valve seat, the upper valve seat is fixedly connected with the lower valve seat, the lower valve seat is provided with a flow channel for communicating the first cavity with the second cavity, the device also comprises an actuating mechanism capable of conducting or sealing the flow channel, the actuating mechanism comprises a coil assembly, a rotor assembly, a guide sleeve assembly and a valve rod assembly, wherein the guide sleeve assembly comprises a metal insert, the metal insert comprises a connecting part, a boss part and a fixing part from top to bottom in sequence, the peripheral size of the boss part is larger than that of the connecting part and the fixing part, a nut component is injection molded above the boss part, and the outer periphery of the fixing part is matched and fixedly connected with the inner periphery of the lower valve seat. The utility model discloses can improve the intensity of guide pin bushing, reduce the assembly degree of difficulty.

Description

Electronic expansion valve with high-reliability guide sleeve connecting structure

Technical Field

The utility model relates to a valve technical field for the vehicle air conditioning system, concretely relates to electronic expansion valve with high reliability guide pin bushing connection structure.

Background

The conventional electronic expansion valve generally comprises a coil, a rotor, a guide sleeve, a valve rod, a valve seat and a valve body, wherein the guide sleeve, the valve seat and the valve body are fixedly connected, the rotor and the valve rod are fixedly connected, the guide sleeve is in threaded connection with the valve rod, the coil is electrified to drive the rotor to rotate, the valve rod and the rotor synchronously rotate, and the guide sleeve cannot rotate so as to realize the up-and-down motion of the valve rod.

In the prior art, the processing mode of the guide sleeve is that a nut component is generally formed on a metal sheet in an injection molding mode, the contact area between the nut component and the metal sheet is small, the nut component and the metal sheet are connected insecurely, and the coaxiality of the guide sleeve adopting the processing mode is ensured by means of a tool when the metal sheet and a valve seat are welded, so that the assembly is inconvenient.

Disclosure of Invention

To the defect among the prior art, the to-be-solved technical problem of the utility model is to provide an electronic expansion valve with high reliability guide pin bushing connection structure, its intensity that can improve the guide pin bushing reduces the assembly degree of difficulty.

In order to solve the above technical problem, the utility model provides an electronic expansion valve with high reliability guide pin bushing connection structure, including the valve body, the inside of this valve body is provided with first cavity, second cavity and the installing port that communicate each other, communicate each other through a passageway between first cavity and the second cavity, sealing connection has the lower valve seat in the passageway, sealing connection has the upper valve seat in the installing port, upper valve seat and lower valve seat fixed connection, be provided with the runner that communicates first cavity with the second cavity on the lower valve seat, still include the actuating mechanism that can switch on or seal the runner, this actuating mechanism includes coil assembly, rotor assembly, guide pin bushing assembly and valve rod assembly, guide pin bushing assembly includes metal insert, this metal insert includes connecting portion, boss portion and fixed part from last to down in proper order, the peripheral size of boss portion is greater than connecting portion with the peripheral size of fixed part, a nut component is formed above the boss part in an injection molding mode, and the outer periphery of the fixing part is matched with the inner periphery of the lower valve seat and fixedly connected with the inner periphery of the lower valve seat; the valve rod assembly comprises a valve rod fixedly connected with the rotor assembly, external threads connected with the nut component in a threaded mode are arranged on the periphery of the valve rod, the valve rod assembly further comprises a valve needle connected to the bottom of the valve rod, the valve needle can be driven by the valve rod to be switched between a conduction state and a closing state, when the valve needle is located in the conduction state, the first cavity and the second cavity are communicated through the flow channel, and when the valve needle is located in the closing state, the valve needle is arranged in the flow channel in a sealing and penetrating mode.

The electronic expansion valve with the high-reliability guide sleeve connecting structure of the utility model is characterized in that the guide sleeve assembly is made by adopting a mode of injection molding a nut component on a metal insert, after injection molding, the bottom of the nut component is contacted with the top of the boss part, the inner periphery of the nut component is contacted with the outer periphery of the connecting part, the contact area of the nut component and the metal insert is increased, and the strength of the guide sleeve assembly is higher; in addition, the bottom of the metal insert is provided with a fixing part which is matched with and fixedly connected with the lower valve seat, so that the guide sleeve assembly and the lower valve seat can be conveniently assembled, and the assembling difficulty is reduced.

Preferably, the connecting portion is provided at an outer circumference thereof with a rotation stopper. The rotation stopper is designed to prevent relative movement between the nut member and the connecting portion in the circumferential direction.

Preferably, the rotation stopping portion is a plurality of flat surface portions disposed on the outer periphery of the connecting portion.

Preferably, the connecting part is provided with a plurality of grooves on the periphery. The groove is arranged on the periphery of the connecting part, so that after the nut component is subjected to injection molding, the axial connecting strength of the nut component and the connecting part can be improved, and the nut component and the metal insert are prevented from moving relatively in the axial direction.

Preferably, the outer circumference of the lower valve seat is convexly provided with a positioning part, and the outer circumference of the positioning part is matched and fixedly connected with the inner circumference of the bottom of the upper valve seat. By adopting the design structure, the lower valve seat and the upper valve seat can be assembled conveniently, and the assembly difficulty is further reduced.

Preferably, the outer periphery of the bottom of the valve needle is provided with a tapered portion, the inner periphery of the flow passage is provided with an arc portion adapted to the tapered portion, and when the valve needle is in the closed state, the tapered portion is in close abutment with the arc portion. The cooperation of toper portion and arc portion can improve sealed effect, prevents interior hourglass.

Preferably, the outer periphery of the positioning part is provided with a first flat part, and a first balance channel is formed between the first flat part and the inner periphery of the upper valve seat; a first balance hole is arranged on the lower valve seat along the radial direction of the lower valve seat, and the first balance hole is positioned above the positioning part; the top of lower disk seat be provided with the installation cavity of fixed part adaptation, first balancing hole link up the lateral wall of installation cavity, just first balancing hole is located the below of fixed part.

Preferably, the bottom of the valve rod is provided with an accommodating cavity, the top of the valve needle penetrates through the accommodating cavity, the bottom of the valve rod is also fixedly connected with a valve needle sleeve, the periphery of the upper part of the valve needle is provided with a step part, and the bottom of the step part is abutted against the top of the valve needle sleeve; and a valve needle spring is also arranged in the accommodating cavity and is compressed and abutted between the supporting block and the step part, and the top part of the supporting block is abutted with the top wall of the accommodating cavity.

Preferably, a second flat part is arranged on the periphery of the bottom of the valve rod, and a second balance channel is formed between the second flat part and the inner wall of the guide sleeve assembly; a second balance hole is provided in the valve rod in a radial direction thereof, the second balance hole being located above the second flat portion.

Preferably, a gap is formed between an outer circumference of the guide bush assembly and an inner circumference of the upper valve seat, and a third balance hole is provided in the nut member in a radial direction thereof. The utility model discloses set up first balanced passageway, second balanced passageway, first balanced hole, second balanced hole and third balanced hole, can be so that the inside fluid dynamic balance of valve body, in addition, first balanced passageway and second balanced passageway adopt the mode formation of first flat portion and second flat portion respectively, can simplify balanced channel structure, reduce the processing degree of difficulty.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of an electronic expansion valve with a highly reliable guide sleeve connection structure according to an embodiment of the present invention;

fig. 2 is a schematic view of a connection structure of the upper valve seat, the lower valve seat, the guide sleeve assembly, the valve rod assembly and the rotor assembly according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a metal insert according to an embodiment of the present invention;

fig. 4 is a partial structural schematic view of a flow passage of the lower valve seat according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a valve stem assembly according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a lower valve seat according to an embodiment of the present invention.

Reference numerals:

1-a valve body; 11-a first cavity; 12-a second cavity; 13-mounting port; 2-lower valve seat; 21-a flow channel; 211-an arc; 22-diversion holes; 23-a positioning section; 231-a first flat portion; 24-a first balancing hole; 3-upper valve seat; 4-a coil assembly; 5-a rotor assembly; 6-guide sleeve assembly; 61-a metal insert; 611-a connecting part; 6111-rotation stop part; 6112-groove; 612-a boss portion; 613-fixed part; 62-a nut member; 621-a third balance hole; 7-a valve stem assembly; 71-a valve stem; 711-second flat; 712-a second balance aperture; 72-a valve needle; 721-a conical section; 73-valve needle sleeve; 74-a needle spring; 75-a support block; 8-a sleeve;

Detailed Description

Here, it is to be noted that the functions, methods, and the like related to the present invention are only conventional adaptive applications of the related art. Therefore, the present invention is an improvement of the prior art, which substantially lies in the connection relationship between hardware, not in the functions and methods themselves, that is, the present invention relates to a few functions and methods, but does not include the improvements proposed in the functions and methods themselves. The present invention is described for better illustration of the function and method for better understanding of the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the present embodiment discloses an electronic expansion valve with a high-reliability guide sleeve connection structure, which includes a valve body 1, a first cavity 11, a second cavity 12 and a mounting port 13, which are mutually communicated, are arranged inside the valve body 1, the first cavity 11 and the second cavity 12 are mutually communicated through a channel, a lower valve seat 2 is hermetically connected in the channel, an upper valve seat 3 is hermetically connected in the mounting port 13, and the upper valve seat 3 is fixedly connected to the lower valve seat 2.

The lower valve seat 2 is provided with a flow passage 21 communicating the first cavity 11 and the second cavity 12, and the lower valve seat 2 is further provided with a plurality of guide holes 22 along a radial direction thereof, and the flow passage 21 is communicated with the first cavity 11 through the guide holes 22.

The electronic expansion valve with the high-reliability guide sleeve connecting structure further comprises an actuating mechanism capable of conducting or closing the flow channel 21, wherein the actuating mechanism comprises a coil assembly 4, a rotor assembly 5, a guide sleeve assembly 6 and a valve rod assembly 7. Specifically, the upper valve seat 3 is in threaded connection with the valve body 1, a sleeve 8 is welded and fixed on the top of the upper valve seat 3, the coil assembly 4 is arranged on the periphery of the sleeve 8, the rotor assembly 5 is arranged inside the sleeve 8, the rotor assembly 5 is welded and fixed with the valve rod assembly 7, the guide sleeve assembly 6 is in threaded connection with the valve rod assembly 7, and the guide sleeve assembly 6 is fixedly connected with the lower valve seat 2.

Specifically, the guide bush assembly 6 includes a metal insert 61, the metal insert 61 includes a connecting portion 611, a boss portion 612, and a fixing portion 613 from top to bottom, an outer circumference of the boss portion 612 is larger than outer circumference of the connecting portion 611 and the fixing portion 613, and an outer circumference of the fixing portion 613 is fitted to an inner circumference of the lower valve seat 2 and is fixed by welding. A nut member 62 is injection-molded from a modified synthetic resin material above the boss portion 612, and the nut member 62 is screwed to the valve stem assembly 7. In this embodiment, a rotation preventing portion 6111 is disposed on the outer periphery of the connecting portion 611, and the rotation preventing portion 6111 is specifically a plurality of flat portions disposed on the outer periphery of the connecting portion 611 to prevent the metal insert 61 and the nut member 62 from rotating relatively; in addition, a plurality of grooves 6112 are provided on the outer periphery of the connecting portion 611 to improve the axial connecting strength between the nut member 62 and the connecting portion 611 and prevent relative movement between the nut member 62 and the metal insert 61 in the axial direction.

Specifically, the valve rod assembly 7 includes a valve rod 71 fixedly connected to the rotor assembly 5, an external thread screwed to the nut member 62 is provided on an outer periphery of the valve rod 71, an accommodation cavity is provided on a bottom portion of the valve rod 71, a needle 72 is inserted into the accommodation cavity, a needle sleeve 73 is welded and fixed to a bottom portion of the valve rod 71, a stepped portion is provided on an upper outer periphery of the needle 72, and a bottom portion of the stepped portion abuts against a top portion of the needle sleeve 73; a needle spring 74 is also provided in the accommodation chamber, the needle spring 74 being compressed and abutted between a support block 75 and a stepped portion of the needle 72, a top portion of the support block 75 abutting a top wall of the accommodation chamber. The bottom of the valve needle 72 extends out of the accommodating cavity and can be switched between a conducting state and a closed state under the driving of the valve rod 71, and when the valve needle 72 is in the conducting state, the first cavity 11 and the second cavity 12 are communicated with the flow passage 21 through the flow guide hole 22, so that the valve body is conducted; when the valve needle 72 is in the closed state, the valve needle 72 is sealingly inserted into the flow channel 21, so that the first cavity 11 and the second cavity 12 are not communicated with each other, and the valve body is cut off.

When the electronic expansion valve with the high-reliability guide sleeve connection structure works, the coil assembly 4 is electrified to drive the rotor assembly 5 to rotate forwards or backwards, the valve rod 71 and the rotor assembly 5 are welded and fixed, the valve rod 71 can rotate synchronously with the rotor assembly 5, the nut component 62 is in threaded connection with the valve rod 71, and the guide sleeve assembly 6 and the lower valve seat 2 are welded and fixed, so that the valve rod 71 ascends or descends along the axial direction of the valve rod under the condition that the nut component 62 cannot rotate, and the valve needle 72 is driven to ascend or descend along the axial direction of the valve needle, so that the first cavity 11 and the second cavity 12 are communicated or sealed.

In this embodiment, the outer periphery of the bottom of the valve needle 72 is provided with a tapered portion 721, the inner periphery of the flow passage 21 is provided with an arc portion 211 adapted to the tapered portion 721, and when the valve needle 72 is in its closed state, the tapered portion 721 is in close contact with the arc portion 211 to prevent internal leakage.

Further, the outer circumference of the lower valve seat 2 is convexly provided with a positioning part 23, and the outer circumference of the positioning part 23 is fitted and welded with the inner circumference of the bottom of the upper valve seat 3.

When the electronic expansion valve with the high-reliability guide sleeve connecting structure is assembled, the valve rod assembly 7 is firstly screwed into the guide sleeve assembly 6, then the guide sleeve assembly 6 and the lower valve seat 2 are pressed and then welded and fixed, then the upper valve seat 3 and the lower valve seat 2 are pressed and then welded and fixed, then the rotor assembly 5 is sleeved on the top of the valve rod 71, abutted and limited and then welded and fixed, the sleeve 8 and the upper valve seat 3 are pressed and then welded and fixed, an O-shaped sealing ring is placed in a corresponding sealing groove of the lower valve seat 2 and the upper valve seat 3, the whole is screwed into the valve body 1, and finally the coil assembly 4 is assembled to complete the assembly of the electronic expansion valve.

Further, a first flat portion 231 is provided at the outer periphery of the positioning portion 23, and a first balance passage is formed between the first flat portion 231 and the inner periphery of the upper seat 3; a first balance hole 24 is provided in the lower valve seat 2 in the radial direction thereof, the first balance hole 24 being located above the positioning portion 23; the top of the lower valve seat 2 is provided with a mounting cavity adapted to the fixing portion 613, the first balance hole 24 penetrates through a sidewall of the mounting cavity, and the first balance hole 24 is located below the fixing portion 613. A second flat part 711 is arranged at the periphery of the bottom of the valve rod 71, and a second balance channel is formed between the second flat part 711 and the inner wall of the guide sleeve assembly 6; a second balance hole 712 is provided in the valve rod 71 in the radial direction thereof, and the second balance hole 712 is located above the second flat portion 711. A gap is formed between the outer circumference of the guide bush assembly 6 and the inner circumference of the upper valve seat 3, and a third balance hole 621 is formed in the nut member 62 in the radial direction thereof. The embodiment is provided with a first balance channel, a second balance channel, a first balance hole 24, a second balance hole 712 and a third balance hole 621, and the first cavity 11, the inner peripheral cavity of the sleeve 8, the inner peripheral cavity of the guide sleeve assembly 6, the installation cavity of the lower valve seat 2 and the inner peripheral cavity of the valve rod 71 can be communicated, so that the fluid inside the valve body 1 is dynamically balanced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides an electronic expansion valve with high reliability guide pin bushing connection structure, includes the valve body, and the inside of this valve body is provided with first cavity, second cavity and the installing port of mutual intercommunication, communicate each other through a passageway between first cavity and the second cavity, sealing connection has lower disk seat in the passageway, sealing connection has last disk seat in the installing port, go up disk seat and lower disk seat fixed connection, be provided with the intercommunication down on the disk seat first cavity with the runner of second cavity still including switching on or sealing the actuating mechanism of runner, this actuating mechanism includes coil assembly, rotor assembly, guide pin bushing assembly and valve rod assembly, its characterized in that:

the guide sleeve assembly comprises a metal insert, the metal insert sequentially comprises a connecting part, a boss part and a fixing part from top to bottom, the outer peripheral size of the boss part is larger than that of the connecting part and that of the fixing part, a nut part is formed above the boss part in an injection molding mode, and the outer periphery of the fixing part is matched with and fixedly connected with the inner periphery of the lower valve seat;

the valve rod assembly comprises a valve rod fixedly connected with the rotor assembly, external threads connected with the nut component in a threaded mode are arranged on the periphery of the valve rod, the valve rod assembly further comprises a valve needle connected to the bottom of the valve rod, the valve needle can be driven by the valve rod to be switched between a conduction state and a closing state, when the valve needle is located in the conduction state, the first cavity and the second cavity are communicated through the flow channel, and when the valve needle is located in the closing state, the valve needle is arranged in the flow channel in a sealing and penetrating mode.

2. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 1, wherein:

the periphery of the connecting part is provided with a rotation stopping part.

3. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 2, wherein:

the rotation stopping part is a plurality of plane parts arranged on the periphery of the connecting part.

4. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 1, wherein:

the periphery of the connecting part is provided with a plurality of grooves.

5. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 1, wherein:

the periphery of the lower valve seat is convexly provided with a positioning part, and the periphery of the positioning part is matched and fixedly connected with the inner periphery of the bottom of the upper valve seat.

6. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 1, wherein:

the outer periphery of the bottom of the valve needle is provided with a conical part, the inner periphery of the flow channel is provided with an arc-shaped part matched with the conical part, and when the valve needle is located in a closed state, the conical part is tightly abutted to the arc-shaped part.

7. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 5, wherein:

a first flat part is arranged on the outer periphery of the positioning part, and a first balance channel is formed between the first flat part and the inner periphery of the upper valve seat;

a first balance hole is arranged on the lower valve seat along the radial direction of the lower valve seat, and the first balance hole is positioned above the positioning part;

the top of lower disk seat be provided with the installation cavity of fixed part adaptation, first balancing hole link up the lateral wall of installation cavity, just first balancing hole is located the below of fixed part.

8. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 1, wherein:

the bottom of the valve rod is provided with an accommodating cavity, the top of the valve needle penetrates through the accommodating cavity, the bottom of the valve rod is also fixedly connected with a valve needle sleeve, the periphery of the upper part of the valve needle is provided with a step part, and the bottom of the step part is abutted against the top of the valve needle sleeve;

and a valve needle spring is also arranged in the accommodating cavity and is compressed and abutted between the supporting block and the step part, and the top part of the supporting block is abutted with the top wall of the accommodating cavity.

9. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 8, wherein:

a second flat part is arranged on the periphery of the bottom of the valve rod, and a second balance channel is formed between the second flat part and the inner wall of the guide sleeve assembly;

a second balance hole is provided in the valve rod in a radial direction thereof, the second balance hole being located above the second flat portion.

10. The electronic expansion valve with high reliability guide sleeve connection structure as claimed in claim 1, wherein:

a gap is formed between the outer periphery of the guide sleeve assembly and the inner periphery of the upper valve seat, and a third balance hole is formed in the nut component along the radial direction of the nut component.