CN108506548B

CN108506548B - Electronic expansion valve

Info

Publication number: CN108506548B
Application number: CN201710103361.2A
Authority: CN
Inventors: 朱方英; 王定军
Original assignee: Zhejiang Dunan Machinery Co Ltd
Current assignee: Zhejiang Dunan Machinery Co Ltd
Priority date: 2017-02-24
Filing date: 2017-02-24
Publication date: 2022-03-08
Anticipated expiration: 2037-02-24
Also published as: CN108506548A

Abstract

The invention provides an electronic expansion valve. The electronic expansion valve comprises a main body (1) and a connecting pipe (2), wherein the connecting pipe (2) is sleeved outside the main body (1), a solder permeation gap (3) is formed between the connecting pipe and the main body (1), a welding ring (4) and a blocking ring (5) are placed near the solder permeation gap (3), the welding ring (4) is arranged corresponding to the solder permeation gap (3), the blocking ring (5) is sleeved on the periphery of the connecting pipe (2), and solder is prevented from permeating along the connecting pipe (2) to the direction far away from the solder permeation gap (3). According to the electronic expansion valve, the problem that welding leakage occurs due to the fact that welding materials easily climb along the connecting pipe in the prior art can be solved.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of air conditioners, in particular to an electronic expansion valve applied to a refrigerating system of an air conditioner, a refrigerator and the like.

Background

The electronic expansion valve is an electromagnetic control component and is used in an industrial control system to control the on-off of a medium or adjust parameters such as the flow of the medium, so as to realize the expected control. In the refrigerating system, the electronic expansion valve is used for adjusting the refrigerating capacity of the evaporator and supplying the optimal amount of refrigerant to the evaporator so as to ensure the stable operation of the refrigerating system. An electronic expansion valve structure in the prior art, such as that disclosed in japanese patent (JP2009-162369), has an outlet connection pipe directly inserted and welded to a valve seat, has no supporting parts on the left and right, and has a connection strength ensured only by the material thickness of the lower connection pipe and the valve seat and the bonding strength of a circumferential annular welding seam at a fitting part, and the welding sealing property of the welding seam structure is not ideal enough and the bonding strength is not reliable enough. When the device is installed in a system, the hidden danger of falling and leakage exists through vibration and high-pressure impact. Similarly, the valve seat core is combined with the valve seat, the defect of poor welding strength also exists, when the side connecting pipe is introduced with high pressure, the lower connecting pipe is introduced with low pressure, and the valve seat and the cover body form a closed cavity which is too high, the valve seat core is subjected to downward air pressure, and if the welding strength is slightly poor, the hidden trouble of falling and leakage exists.

The chinese patent application No. 201110436124.0 entitled "a fixing structure of a connecting tube and a valve seat" discloses a fixing structure of a connecting tube and a valve seat, in which the valve seat is sequentially provided with a step part and a fitting part along an axial direction, the connecting tube is sleeved on the outer periphery of the fitting part, the outer periphery of the step part is provided with a solder accommodating part, after the connecting tube and the valve seat are brazed, the solder accommodating part forms a solder area, and the solder area extends to a joint part of the connecting tube and the step part.

Utilize step portion on the valve seat to form solder holding portion in this application, then guarantee the shaping position of solder through this solder holding portion to avoid the solder to adhere to in the bad welding seam form of takeover peripheral surface, improve the production yields. However, in the application, the valve seat and the connecting pipe are welded, and the solder is in contact with the connecting pipe, so that the solder is still easily affected by the connecting pipe, and the possibility that the solder climbs along the connecting pipe during welding to cause a welding missing problem still exists, so that the production yield of the electronic expansion valve is still reduced.

Disclosure of Invention

The invention aims to provide an electronic expansion valve to solve the problem that welding leakage occurs because welding flux easily climbs along a connecting pipe in the prior art.

In order to solve the above technical problems, an aspect of the present invention provides an electronic expansion valve, which includes a main body and a connection pipe, wherein the connection pipe is sleeved outside the main body, and forms a solder penetration gap with the main body, a welding ring and a blocking ring are disposed near the solder penetration gap, the welding ring is disposed corresponding to the solder penetration gap, and the blocking ring is sleeved on the periphery of the connection pipe and prevents solder from penetrating along the connection pipe in a direction away from the solder penetration gap.

According to the electronic expansion valve, the welding flux permeation gap is formed at the welding position of the main body and the connecting pipe, the welding ring is arranged at the welding flux permeation gap, the blocking ring is sleeved on the periphery of the connecting pipe and prevents the welding flux from permeating along the connecting pipe to the direction far away from the welding flux permeation gap, the blocking ring is not easy to be combined with the welding flux relative to the connecting pipe, and the blocking ring can block the welding flux from climbing to the direction far away from the welding flux permeation gap, so that the flow direction of the welding flux can be ensured, the welding flux can smoothly and sufficiently flow into the welding flux permeation gap, the effective welding between the main body and the connecting pipe is realized, and the welding strength is improved.

Drawings

Fig. 1 is a sectional structural view schematically showing an electronic expansion valve according to a first embodiment of the present invention;

FIG. 2 schematically illustrates an enlarged structural view at L of FIG. 1;

fig. 3 is a sectional structural view schematically showing an electronic expansion valve according to a second embodiment of the present invention;

FIG. 4 schematically illustrates an enlarged structural view at M of FIG. 3;

fig. 5 is a sectional structural view schematically showing an electronic expansion valve according to a third embodiment of the invention;

FIG. 6 schematically shows an enlarged structural view at N of FIG. 5;

fig. 7 is a sectional structural view schematically showing an electronic expansion valve according to a fourth embodiment of the present invention.

Reference numbers in the figures: 1. a main body; 2. taking over a pipe; 3. the solder penetrates the gap; 4. welding a ring; 5. a blocking ring; 6. a valve body; 7. a valve seat; 8. mounting holes; 9. flanging; 10. a V-shaped groove; 11. a stop step.

Detailed Description

The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.

Referring to fig. 1 to 7, according to an embodiment of the present invention, the electronic expansion valve includes a main body 1 and a connection pipe 2, the connection pipe 2 is sleeved outside the main body 1, and a solder penetration gap 3 is formed between the connection pipe and the main body 1, a welding ring 4 and a blocking ring 5 are disposed near the solder penetration gap 3, the welding ring 4 is disposed corresponding to the solder penetration gap 3, and the blocking ring 5 is sleeved on the periphery of the connection pipe 2 and prevents solder from penetrating along the connection pipe 2 in a direction away from the solder penetration gap 3.

Generally speaking, in the present embodiment, the barrier ring 5 is less likely to bond with solder than the nozzle 2, and the barrier ring 5 is in interference fit with the nozzle, so that solder can flow more to the solder penetration gap 3, rather than being fixedly welded to the barrier ring 5. The main body 1 should be made of steel or brass with low thermal conductivity, and the adapter tube 2 should be made of red copper with good thermal conductivity, so that the solder in the contact part with the adapter tube 2 can reach the melting point more quickly in the welding process, and a stable and effective welding structure can be formed between the solder and the adapter tube 2.

According to the electronic expansion valve, the solder permeation gap 3 is formed at the welding position of the main body 1 and the connecting pipe 2, the welding ring 4 is arranged at the solder permeation gap 3, the blocking ring 5 is sleeved on the periphery of the connecting pipe 2 and prevents solder from permeating along the connecting pipe 2 in the direction far away from the solder permeation gap 3, the blocking ring 5 is not easy to be combined with the solder relative to the connecting pipe 2, and the blocking ring 5 can prevent the solder from climbing in the direction far away from the solder permeation gap 3, so that the flow direction of the solder can be ensured, the solder can smoothly flow into the solder permeation gap 3, effective welding between the main body 1 and the connecting pipe 2 is realized, and the welding strength is improved.

The setting position of the blocking ring 5 can be selected in various ways, and needs to be determined according to the installation position of the welding ring 4, generally speaking, in order to more effectively prevent the solder from climbing towards the direction far away from the solder permeation gap 3, referring to the flow characteristic after the welding ring 4 is melted, the blocking ring 5 is arranged below the welding ring 4, when the welding ring 4 is melted under the action of the adapter tube 2, the solder flows downwards under the action of gravity, due to the blocking effect of the blocking ring 5, the welding ring 4 cannot flow downwards after being melted, and when the welding ring 4 is melted by a certain amount, the melted part of the welding ring 4 flows into the solder permeation gap 3, so that stable welding is formed between the main body 1 and the adapter tube 2.

Preferably, the blocking ring 5 is made of stainless steel.

Preferably, the blocking ring 5 is coated with solder flow inhibitor, so that the molten solder can be prevented from flowing along the surface of the blocking ring 5 and flowing out of the outer edge of the blocking ring 5, the blocking effect of the blocking ring 5 on the solder is further improved, the solder can be more effectively ensured to enter the solder permeation gap 3, sufficient solder can enter the solder permeation gap 3, the problem of solder leakage is avoided, the welding effect between the main body 1 and the connecting pipe 2 is ensured, and the connection strength and the connection stability between the main body 1 and the connecting pipe 2 are ensured.

Referring to fig. 1 and 2 in combination, according to the first embodiment of the present invention, the main body 1 includes a valve body 6 and a valve seat 7, a mounting hole 8 is provided in the middle of the valve body 6, the valve seat 7 is inserted into the mounting hole 8, the adapter 2 is sleeved on a portion of the valve seat 7 penetrating through the valve body 6 and forms a solder penetrating gap 3 with the valve body 6, and the solder ring 4 is disposed between the valve body 6 and the adapter 2. In this embodiment, main part 1 adopts split type structure, can simplify the shaping degree of difficulty of main part 1, reduces the processing cost, improves machining efficiency. The solder penetrating gap 3 extends to the outer peripheral side of the valve seat 7, so that when the solder is soldered, the solder can flow to the outer peripheral side of the valve seat 7 along the solder penetrating gap 3, thereby forming a good and stable connection between the valve body 6, the valve seat 7, and the adapter tube 2.

Preferably, the solder ring 4 is placed inside the solder-permeable seam 3, and the barrier ring 5 is disposed outside the solder ring 4 and blocks the opening on the peripheral side of the solder-permeable seam 3. In this embodiment, the radius of the barrier ring 5 is greater than that of the solder ring 4, so that the barrier ring 5 can block the opening on the peripheral side of the solder penetration gap 3, and the solder ring 4 is disposed in the solder penetration gap 3, when performing a soldering operation, the melted solder cannot flow out from the opening of the solder penetration gap 3 due to the sealing and blocking effect of the barrier ring 5, and is all remained in the solder penetration gap 3, so that the solder can be completely applied to the soldering effect between the valve body 6 and the adapter tube 2, and the soldering effect is improved.

In the embodiment, the adapter tube 2 can press the welding ring, and then the welding ring is placed in the brazing furnace for welding, and as the upper edge and the lower edge of the barrier ring 5 are respectively contacted with the valve body 6 and the adapter tube 2, the sealing effect of the barrier ring 5 on the welding flux can be ensured, and the leakage of the welding flux can be effectively prevented.

Referring to fig. 3 and 4 in combination, according to the second embodiment of the present invention, the main body 1 includes a valve body 6 and a valve seat 7, a mounting hole 8 is formed in the middle of the valve body 6, the valve seat 7 is inserted into the mounting hole 8, the adapter 2 is sleeved on a portion of the valve seat 7 penetrating through the valve body 6, and a solder penetrating gap 3 is formed between the adapter 2 and the valve body 6, the welding ring 4 is placed at a corner formed by the adapter 2 and the valve body 6, and the blocking ring 5 is disposed below the welding ring 4. This embodiment is substantially the same as the electronic expansion valve of the first embodiment except that in this embodiment, the solder-penetrating slit 3 is small enough not to fit into the solder ring 4, and therefore the solder ring 4 is prevented from being outside the solder-penetrating slit 3 and is provided correspondingly to the solder-penetrating slit 3. In addition, in this embodiment, the blocking ring 5 is disposed below the welding ring 4, and can support the welding ring 4, and simultaneously can form a blocking for the downward climbing of the solder, so that the solder can enter the solder penetration gap 3 more quickly after being melted, and the welding effect of the solder is ensured.

The blocking ring 5 in this embodiment may have the same cross-sectional area with respect to the weld ring 4, or may have a cross-sectional area larger than the weld ring 4, which may be specifically selected according to actual design requirements.

The top of the welding ring 4 is in contact with the welding surface of the valve body 6 and can be matched with the valve body, so that the solder is prevented from leaking in the welding process, and the effective utilization rate of the solder is improved.

Referring to fig. 5 and 6 in combination, according to the third embodiment of the present invention, the main body 1 includes a valve body 6 and a valve seat 7, a mounting hole 8 is formed in the middle of the valve body 6, the valve seat 7 is inserted into the mounting hole 8, a stopping step 11 is formed on a portion of the valve seat 7 extending out of the valve body 6, the adapter 2 is sleeved on the valve seat 7 and stopped at the stopping step 11, a solder penetrating gap 3 is formed between the adapter 2 and the valve body 6, the welding ring 4 is disposed at the solder penetrating gap 3, and the blocking ring 5 is disposed at the bottom of the welding ring 4.

In this embodiment, the valve seat 7 is fixed to the pipe 2 by the stopping step 11, and the valve body 6 is also fixedly connected to the valve seat 7, so that the valve body 6 and the pipe 2 can be accurately positioned by the valve seat 7, and a large gap can be formed between the end of the pipe 2 and the welding surface of the valve body 6, so that a large amount of solder can enter conveniently, and the welding quality between the valve body 6 and the pipe 2 can be ensured.

Referring to fig. 7 in combination, according to the fourth embodiment of the present invention, the main body 1 includes a valve body 6 and a valve seat 7, a mounting hole 8 is formed in the middle of the valve body 6, the valve seat 7 is inserted into the mounting hole 8, the adapter 2 is sleeved on a portion of the valve seat 7 penetrating through the valve body 6, a solder penetration gap 3 is formed between the adapter 2 and the valve body 6, and a flange 9 extending toward the adapter 2 is formed around the mounting hole 8 of the valve body 6.

In this embodiment, the solder penetration gap 3 is formed between the flange 9 and the adapter tube 2, and the flange 9 extends toward the adapter tube 2, so that the operable space outside the welding ring 4 is increased, the welding ring 4 is convenient to operate, the welding quality can be more conveniently ensured, and the welding leakage is effectively avoided.

Preferably, a V-shaped groove 10 is formed between the connecting pipe 2 and the flanging 9 of the valve body 6, the welding ring 4 is arranged in the V-shaped groove 10, and the blocking ring 5 is supported below the welding ring 4. The V-shaped groove 10 can effectively position the welding ring 4, so that the welding ring 4 can be clamped conveniently, the relative position of the welding ring 4 in the welding process is avoided, and the stability of the welding process is ensured. In addition, the V-shaped groove 10 can also form a guiding effect on the flowing of the solder, so that the solder can more conveniently enter the solder permeating gap 3, and more welding solder can be accumulated outside the solder permeating gap 3 after the solder enters the solder permeating gap 3, thereby further ensuring the welding quality and improving the welding qualification rate.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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. The electronic expansion valve is characterized by comprising a main body (1) and a connecting pipe (2), wherein the connecting pipe (2) is sleeved outside the main body (1), the main body (1) comprises a valve body (6) and a valve seat (7), a mounting hole (8) is formed in the middle of the valve body (6), the valve seat (7) is arranged in the mounting hole (8) in a penetrating manner, the connecting pipe (2) is sleeved on a part, penetrating out of the valve body (6), of the valve seat (7) and forms a solder permeation gap (3) with the valve body (6), a welding ring (4) and a blocking ring (5) are placed near the solder permeation gap (3), and the welding ring (4) is placed between the valve body (6) and the connecting pipe (2);

weld ring (4) and place in solder infiltration gap (3), barrier ring (5) set up weld ring (4) outside to the block is in the week side opening part in solder infiltration gap (3), prevent the solder along take over (2) to keeping away from the direction infiltration in solder infiltration gap (3).

2. An electronic expansion valve according to claim 1, wherein the blocking ring (5) is made of stainless steel.

3. An electronic expansion valve according to claim 1, wherein the barrier ring (5) is coated externally with a solder flow inhibitor.

4. The electronic expansion valve is characterized by comprising a main body (1) and a connecting pipe (2), wherein the connecting pipe (2) is sleeved outside the main body (1), the main body (1) comprises a valve body (6) and a valve seat (7), a mounting hole (8) is formed in the middle of the valve body (6), the valve seat (7) is arranged in the mounting hole (8) in a penetrating manner, the connecting pipe (2) is sleeved on a part, penetrating out of the valve body (6), of the valve seat (7) and forms a welding flux permeation gap (3) with the valve body (6), and a flanging (9) extending towards the connecting pipe (2) is formed on the periphery side of the mounting hole (8) of the valve body (6);

a welding ring (4) and a blocking ring (5) are placed near the solder permeation gap (3), a V-shaped groove (10) is formed between the connecting pipe (2) and a flanging (9) of the valve body (6), the welding ring (4) is arranged in the V-shaped groove (10), and the blocking ring (5) is supported below the welding ring (4) and prevents solder from permeating along the connecting pipe (2) in the direction far away from the solder permeation gap (3).

5. An electronic expansion valve according to claim 4, wherein the blocking ring (5) is made of stainless steel.

6. An electronic expansion valve according to claim 4, wherein the barrier ring (5) is coated externally with a solder flow inhibitor.

7. The electronic expansion valve is characterized by comprising a main body (1) and a connecting pipe (2), wherein the connecting pipe (2) is sleeved outside the main body (1), the main body (1) comprises a valve body (6) and a valve seat (7), a mounting hole (8) is formed in the middle of the valve body (6), the valve seat (7) is arranged in the mounting hole (8) in a penetrating manner, the connecting pipe (2) is sleeved on a part, penetrating out of the valve body (6), of the valve seat (7), and a welding flux permeation gap (3) is formed between the connecting pipe (2) and the valve body (6);

solder permeation gap (3) near place weld ring (4) and barrier ring (5), weld ring (4) place take over (2) with the corner that valve body (6) formed, barrier ring (5) set up weld ring (4) below to prevent the solder along take over (2) to keeping away from the direction infiltration of solder permeation gap (3).

8. An electronic expansion valve according to claim 7, wherein the blocking ring (5) is made of stainless steel.

9. An electronic expansion valve according to claim 7, wherein the barrier ring (5) is coated externally with a solder flow inhibitor.

10. An electronic expansion valve according to claim 7, wherein the top of the weld ring (4) is in contact with a weld surface of the valve body (6).