CN110369819B

CN110369819B - Electronic expansion valve

Info

Publication number: CN110369819B
Application number: CN201810326950.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2018-04-12
Filing date: 2018-04-12
Publication date: 2022-09-23
Anticipated expiration: 2038-04-12
Also published as: CN110369819A

Abstract

The invention discloses an electronic expansion valve, which comprises a valve seat, a valve needle and a connecting pipe, wherein the valve seat is provided with a valve port, the valve needle can be close to or far away from the valve port, the electronic expansion valve also comprises a valve core seat, the valve core seat is fixedly connected with the valve seat, and the valve port is formed in a valve core of the valve seat; a gap S1 is formed between the valve seat core and the valve seat, a first welding seam is formed by the gap S1, the adapter tube is fixedly connected with the valve seat, a gap S2 is formed between the adapter tube and the valve seat core, a second welding seam is formed by the gap S2, a containing groove A is formed between the end part of the valve seat and the adapter tube, and the containing groove A can be communicated with the first welding seam and the second welding seam; the accommodating groove A can store solder, and the solder can be filled in the first welding line, the second welding line and the accommodating groove after the furnace welding process so as to form a sealing connection structure. The electronic expansion valve can better improve the connection reliability and the sealing performance of the connecting pipe and the valve seat.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of fluid control, in particular to an electronic expansion valve for adjusting the flow of a refrigerant in a refrigeration system.

Background

Referring to fig. 1 and 2, fig. 1 is a schematic external structural view of a typical electronic expansion valve; fig. 2 is a schematic view of an internal structure of the electronic expansion valve shown in fig. 1.

As shown in the drawings, a typical electronic expansion valve is mainly composed of a valve body 100' and a coil 200', wherein the valve body 100' includes a valve seat member 10', a transmission mechanism 20', a speed reduction mechanism 30', a housing member 40', and a rotor 50' of a driving mechanism, and in operation, the coil 200' is energized to generate electromagnetic force to drive the rotor 50' to rotate, and after the rotor rotation is reduced by the speed reducer 30', the rotation is converted into linear motion by the transmission mechanism 20' and transmitted to a valve needle 11' of the valve seat member 10', so that the valve needle 11' performs linear motion of advancing and retreating along a valve port direction, thereby controlling the opening degree of the valve.

Referring to fig. 3, fig. 3 is a partial schematic structural view of a valve seat member of the electronic expansion valve shown in fig. 2.

As shown, the valve seat part 10' includes: a first adapter tube 14 'and a second adapter tube 18' connected to the valve seat 17', a cover 15' connected to the valve seat 17', a needle hub 16' connected to the valve seat 17', a nut 20a' connected to the valve seat 17', a spring 19' inside the needle hub 16 'and the needle 11'.

In the structure of the valve seat component, the valve port matched with the valve needle 11 'is directly formed on the valve seat 17', and the poor phenomena such as welding seams and air holes are easy to occur at the welding joint of the second connecting pipe 18 'of the valve port and the valve seat 17', so that the possibility of refrigerant leakage is easily caused.

Therefore, how to avoid the refrigerant from leaking out of the joint of the connecting pipe and the valve seat is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide an electronic expansion valve which can better improve the connection reliability and the sealing performance of a connecting pipe and a valve seat of the electronic expansion.

In order to achieve the above object, the present invention provides an electronic expansion valve, which includes a valve seat, a valve needle, a connecting pipe, a valve core seat, a valve core, a valve seat cover, a valve core and a valve core; a gap S1 is formed between the valve seat core and the valve seat, a first welding seam is formed in the gap S1, the adapter tube is fixedly connected with the valve seat, a gap S2 is formed between the adapter tube and the valve seat core, a second welding seam is formed in the gap S2, a containing groove A is formed between the end part of the valve seat and the adapter tube, and the containing groove A can be communicated with the first welding seam and the second welding seam; the accommodating groove A can store solder, and the solder can be filled in the first welding line, the second welding line and the accommodating groove after the furnace welding process so as to form a sealing connection structure.

The electronic expansion valve provided by the invention comprises a valve seat core provided with a valve port, a first welding seam is formed between the valve seat core and a valve seat, the electronic expansion valve also comprises a connecting pipe, a second welding seam is formed between the connecting pipe and the valve seat core, and meanwhile, an accommodating groove communicated with the first welding seam and the second welding seam is formed between the valve seat and the valve seat core. When welding, the holding tank is used for placing the welding material and can accomplish the welded connection of first welding seam, second welding seam and holding tank through stove welding technology, and relative ratio background art, not only welding efficiency is higher, and welding quality can not receive staff's technical ability height and influence, can not appear bad phenomena such as welding seam gas pocket, and the welding seam quality is reliable, can form effective sealing, avoids appearing the refrigerant and leaks the scheduling problem outward.

Drawings

FIG. 1 is a schematic diagram of an exemplary electronic expansion valve external configuration;

FIG. 2 is a schematic diagram of the internal structure of the electronic expansion valve shown in FIG. 1;

fig. 3 is a partial schematic structural view of a valve seat member of the electronic expansion valve shown in fig. 2;

FIG. 4 is a schematic diagram of an external structure of an electronic expansion valve according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the internal structure of the electronic expansion valve shown in FIG. 4;

FIG. 6 is a schematic diagram illustrating a partial configuration of a valve seat member of the electronic expansion valve of FIG. 4;

FIG. 7 is a partial enlarged view of portion A of FIG. 6;

FIG. 8 is a schematic view of a solder ring disposed in the receiving groove;

FIG. 9 is a diagram showing a distribution of solder after soldering by a furnace soldering process;

fig. 10 is a partially enlarged view of a valve seat member of another electronic expansion valve according to an embodiment of the present invention.

In fig. 1 to 3:

100 'valve body 200' coil

10', valve seat part 11', valve needle 14', first connecting pipe 15', cover 16', valve needle sleeve 17', valve seat 18', second connecting pipe 19', spring 20', transmission mechanism 20a ', nut 30', speed reducing mechanism 40', housing part 50', rotor

In fig. 4 to 10:

100. valve body 200 coil

10. Valve seat component 11, valve needle 12, nut seat 13, valve seat core 13a, valve seat core front section 13b, valve seat core end face 13c, step part 14, first connecting pipe 16, valve needle sleeve 17, valve seat 17a, valve seat core mounting hole rear section 17b, valve seat end face 18, second connecting pipe 18a, straight thread 19, spring 20, transmission mechanism 20a, nut 30, speed reducing mechanism 40, shell component 50, rotor 60, first welding seam 70, second welding seam 80, cone platform part 90, annular groove 110, welding material ring 111, accommodating groove 112, welding material

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In this document, terms such as "front, rear, inside, and outside" are established based on the positional relationship shown in fig. 7, and the corresponding positional relationship may vary depending on the drawing, and therefore, the terms are not to be construed as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

Referring to fig. 4 and 5, fig. 4 is a schematic external structural view of an electronic expansion valve according to an embodiment of the present invention; FIG. 5 is a schematic diagram of the internal structure of the electronic expansion valve shown in FIG. 4;

as shown in the drawings, in one embodiment, the expansion valve provided by the present invention is mainly composed of a valve body 100 and a coil 200; wherein the valve body 100 includes a valve seat member 10, a transmission mechanism 20, a reduction mechanism 30, a housing member 40, and a rotor 50; when the valve is in operation, the coil 200 is energized to generate electromagnetic force to drive the rotor 50 to rotate, and after the rotor rotation is decelerated by the decelerator 30, the rotation is converted into linear motion by the transmission mechanism 20 and transmitted to the valve needle 11 of the opening control mechanism, so that the valve needle 11 makes linear motion of advancing and retreating along the valve port direction, thereby controlling the opening of the valve.

Referring to fig. 6 and 7, fig. 6 is a schematic partial structural view of a valve seat member of the electronic expansion valve shown in fig. 4; fig. 7 is a partially enlarged view of a portion a in fig. 6.

As shown in the drawing, the valve seat member 10 includes a nut seat 12 connected to a valve seat 17, a nut 20a connected to the nut seat 12, a needle housing 16 connected to the nut seat 12, a first connection pipe 14 connected to the valve seat 17, a valve seat core 13 connected to the valve seat 17, and a second connection pipe 18 connected to the valve seat core 13, and a spring 19 and a needle 11 are provided inside the needle housing 16.

The valve seat core 13 is disc-shaped, a through hole in the middle of the valve seat core 13 forms a valve port matched with the valve needle 11, the valve seat core 13 and the valve seat 17 are of a split structure, the valve seat core and the valve seat 17 are welded and connected when assembled, a valve seat core mounting hole is formed in the valve seat 17, the front section 13a of the valve seat core is in interference fit with the valve seat core mounting hole to ensure coaxiality between the front section 13a of the valve seat core and the valve seat core mounting hole, a gap S1 between the rear section of the valve seat core 13 and the rear section 17a of the valve seat core mounting hole forms a first welding line 60, a second connecting pipe 18 and the valve seat core 13 are in clearance fit, a gap S2 between the two forms a second welding line 70, and the gap can flow into and be filled for welding materials.

Specifically, the seat core mounting hole rear section 17a is provided with a stepped hole having an inner diameter that becomes larger, and a first weld 60 is formed between the inner wall of this stepped hole and the outer wall of the seat core 13 rear section.

The valve seat core end face 13b is lower than the valve seat end face 17b, and the drop height region therebetween forms a receiving groove 111 (i.e., receiving groove a shown in fig. 10), and this receiving groove 111 communicates with the first weld 60 and the second weld 70, and is capable of storing the solder ring 110 for furnace welding.

The outer end of the valve seat core 13 is provided with an inner concave part for installing the second connecting pipe 18, the bottom surface of the inner concave part is provided with a cone part 80, an annular groove 90 for accommodating the insertion end of the second connecting pipe 18 is formed between the conical surface of the cone part 80 and the side wall of the inner concave part, the outer edge of the insertion end of the second connecting pipe 18 is chamfered to form an outer conical surface, the inner edge of the insertion end of the second connecting pipe 18 is chamfered to form an inner conical surface, the conical angle of the outer conical surface is smaller than the conical angle of the inner conical surface, and the height of the outer conical surface is larger than that of the inner conical surface.

In addition, the outer surface of the insertion end of the second connecting pipe 18 is also rolled with relatively dense axial straight grains 18a, the length of the straight grains 18a enables the straight grains to exceed the end face 17b of the valve seat for a certain distance backwards, the axial straight grains 18a are rolled on the outer surface of the insertion end of the second connecting pipe 18, a flow channel can be formed, solder can conveniently flow along the flow channel to enter a second welding line 70, a circumferential meshing structure can be formed after welding, the second connecting pipe 18 is prevented from rotating relative to the valve seat core 13, and welding strength is improved.

Referring to fig. 8 and 9, fig. 8 is a schematic view illustrating a solder ring disposed in a receiving groove; fig. 9 is a diagram showing a distribution state of solder after soldering by a furnace soldering process.

As shown in the figure, when the furnace welding process is used for welding, the solder ring 110 is placed in the receiving groove 111, after the furnace welding, the solder 112 formed by melting the solder 110 is filled in the first welding seam 60 between the valve seat 17 and the valve seat core 13, the second welding seam 70 between the valve seat core 13 and the second adapter tube 18, and the receiving groove 111, and the solder 112 can be further filled in the gap between the outer conical surface of the second adapter tube 18 and the side wall of the annular groove 90, the gap between the inner conical surface and the conical surface of the conical portion 80, and the gap between the conical surface of the conical portion 80 and the inner wall of the second adapter tube 18 from the second welding seam 70, so as to form a sealed connection structure.

The outer conical surface and the inner conical surface of the insertion end of the second connecting pipe 18 can ensure that the second connecting pipe 18 can be easily inserted into the valve seat core 13 on one hand, and can be matched with the cone part 80 and the annular groove 90 on the other hand to form a welding seam which gradually widens on the outer side and a welding seam which gradually narrows and then gradually widens on the inner side.

Referring to fig. 10, fig. 10 is a partially enlarged view of a valve seat member of another electronic expansion valve according to an embodiment of the present invention.

As shown in the drawing, in another specific embodiment, a valve seat 17 of the expansion valve provided by the present invention is provided with a valve seat core mounting hole, a front section 13a of the valve seat core is in interference fit with the valve seat core mounting hole, a rear section of the valve seat core 13 is provided with a step portion 13c with a reduced radial dimension, a first weld 60 is formed between an outer wall of the step portion 13c and an inner wall of the rear section 17a of the valve seat core mounting hole, and the rest of the structure is substantially the same as that of the above embodiment, and it can refer to the above embodiment, and is not described herein again.

Of course, in order to form the first welding seam 60, the two embodiments may also be adopted, that is, the rear section 17a of the valve seat core mounting hole is provided with a step hole, meanwhile, the rear section of the valve seat core 13 is provided with a step part 13c with a radial size decreasing, a first welding seam is formed between the outer wall of the step part 13c and the inner wall of the step hole of the rear section 17a of the valve seat core mounting hole, and the radial size increasing of the step hole and the radial size decreasing of the step part 13c may be respectively half of the width of the first welding seam 60 in the embodiments, or one of the radial size increasing and the other of the radial size decreasing may be one third and the other is two thirds, and so on. In this way, it is ensured that the width of the first weld 60 formed by combining the two is substantially the same as that of the above-described embodiment.

It should be noted that, only the welded sealing structure of the second connecting pipe 18 corresponding to the valve port is described above, and as for the first connecting pipe 14, the same welded sealing structure as that of the second connecting pipe 18 can also be adopted according to actual needs.

The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of the above embodiments, the present invention can be specifically adjusted according to actual needs, so as to obtain different embodiments. For example, the taper angle of the inner tapered surface of the insertion end of the second adapter 18 is equal to or less than the taper angle of the tapered land 80, or the height of the inner tapered surface of the insertion end of the second adapter 18 is one-fourth to one-sixth of the height of the tapered land 80, and so on. This is not illustrated here, since many implementations are possible.

Because when welding, can adopt the stove welding technology once only to accomplish the welded connection of first welding seam 60, second welding seam 70 and holding tank 111 through a solder ring 110, consequently, its welding seam has twice, nevertheless owing to can adopt stove welding technology to weld, compare with the structure that adopts the flame brazing mode to carry out the welding, not only welding efficiency is higher, moreover, welding quality can not receive staff's technical skill height and influence, bad phenomena such as welding seam gas pocket can not appear, welding seam quality is reliable, can form effective seal, avoid appearing the refrigerant leak scheduling problem outward.

The electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall into the protection scope of the claims of the present invention.

Claims

1. An electronic expansion valve is characterized by comprising a valve seat, a valve needle and a connecting pipe, wherein the valve seat is provided with a valve port, the valve needle can be close to or far away from the valve port, the electronic expansion valve also comprises a valve seat core, the valve seat core is fixedly connected with the valve seat, and the valve port is formed in the valve seat core; a gap S1 is formed between the valve seat core and the valve seat, the gap S1 forms a first welding seam, the adapter tube is fixedly connected with the valve seat core, a gap S2 is formed between the adapter tube and the valve seat core, the gap S2 forms a second welding seam, and a containing groove A is formed between the end part of the valve seat and the adapter tube and can be communicated with the first welding seam and the second welding seam; the accommodating groove A can store solder, and the solder can be filled in the first welding seam, the second welding seam and the accommodating groove after the furnace welding process so as to form a sealing connection structure; the outer end face of the valve seat core is lower than the end face of the valve seat, and a drop height area between the outer end face of the valve seat core and the end face of the valve seat core forms the accommodating groove; the valve seat core is disc-shaped, the through hole in the middle of the valve seat core forms the valve port, and the outer end of the valve seat core is provided with an inner concave part; a conical table part is arranged on the bottom surface of the inner concave part, and an annular groove for accommodating the insertion end of the connecting pipe is formed between the conical surface of the conical table part and the side wall of the inner concave part; the outer edge of the insertion end of the connecting pipe is chamfered to form an outer conical surface, and the inner edge of the insertion end of the connecting pipe is chamfered to form an inner conical surface; and the welding flux is further filled into a gap between the outer conical surface and the side wall of the annular groove, a gap between the inner conical surface and the conical surface of the conical table part and a gap between the conical surface of the conical table part and the inner wall of the connecting pipe from the second welding seam.

2. An electronic expansion valve according to claim 1, wherein the valve seat is provided with a seat core mounting hole; the front section of the valve seat core is in interference fit with the valve seat core mounting hole, and a gap between the rear section of the valve seat core and the valve seat core mounting hole forms the first welding line.

3. The electronic expansion valve according to claim 2, wherein the rear section of the valve seat core mounting hole is provided with a stepped hole with an enlarged radial dimension, and the first weld is formed between an inner wall of the stepped hole and an outer wall of the rear section of the valve seat core.

4. The electronic expansion valve according to claim 2, wherein the rear section of the valve seat core is provided with a stepped portion with a reduced radial dimension, and the first weld is formed between an outer wall of the stepped portion and an inner wall of the rear section of the mounting hole of the valve seat core.

5. The electronic expansion valve of claim 1, wherein the taper angle of the outer tapered surface is less than the taper angle of the inner tapered surface and the height of the outer tapered surface is greater than the height of the inner tapered surface.

6. An electronic expansion valve according to any of claims 1 to 5, wherein the outer surface of the insertion end of the nipple is rolled with axial straight threads.