Capillary and pilot valve pipe connecting structure and four-way reversing valve

Abstract

The utility model provides a capillary and guide valve pipe connecting structure and four -way reversing valve, this capillary and guide valve pipe connecting structure includes capillary, guide valve pipe and cover, the cover is tightly fitted in one end of guide valve pipe, the outer end part of cover is provided with annular flanging, the outside of cover is provided with first welding ring, the cover is fixed with guide valve pipe through first welding ring and is circumferential sealing, the inner end part of cover is provided with first annular flanging coaxially, one end of capillary is inserted in first annular flanging and is tightly fitted with first annular flanging, the outside of capillary is provided with second welding ring, capillary is fixed with cover through second welding ring and is circumferential sealing, be provided with filter structure on the communication path of capillary and guide valve pipe, the four -way reversing valve includes above -mentioned capillary and guide valve pipe connecting structure, the capillary, cover and guide valve pipe of its inside integrative welding are completed, and have the advantages such as convenient welding, low welding cost and high welding reliability.

Description

Technical Field

[0001] This utility model relates to the field of four-way reversing valve technology, specifically to a capillary tube and pilot valve tube connection structure and a four-way reversing valve. Background Technology

[0002] Four-way reversing valves (hereinafter referred to as four-way valves) are mainly used in heat pump air conditioners, water heaters and other systems. They are mainly used to switch the flow direction of the refrigerant in the system, thereby realizing the functions of cooling, heating and defrosting of the entire system.

[0003] In traditional processes, the air inlet sealing of the pilot valve of a four-way directional valve is mainly achieved by furnace welding of a stainless steel pilot valve tube and a stainless steel cap, then riveting the components contained in the cap into the pilot valve tube, and finally sealing by laser welding. However, this welding process is relatively complicated, difficult to weld, still poses a certain risk of leakage, and is also costly. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a capillary tube and pilot valve tube connection structure and a four-way reversing valve, wherein the internal capillary tube, cap and pilot valve tube are integrally welded together, and have the advantages of convenient welding, low welding cost and high welding reliability.

[0005] This utility model provides a capillary tube and pilot valve tube connection structure, including a capillary tube, a pilot valve tube, and a cap. The cap is tightly fitted into one end of the pilot valve tube. The outer end of the cap is provided with an annular flange that folds outward along the radial direction of the cap. A first welding ring is sleeved on the outside of the cap. The first welding ring abuts against the inner sidewall of the annular flange and one end of the cap. The cap and the pilot valve tube are welded and fixed together by the first welding ring and are circumferentially sealed. The inner end of the cap is coaxially provided with a first annular fold that folds away from the cap along the axial direction of the cap. One end of the capillary tube is inserted into the first annular fold and tightly fitted with it. A second welding ring is sleeved on the outside of the capillary tube. The second welding ring abuts against the inner end face of the cap. The capillary tube and the cap are welded and fixed together by the second welding ring and are circumferentially sealed. A filter structure is provided in the communication path between the capillary tube and the pilot valve tube.

[0006] By adopting the above-mentioned structure, this utility model can reduce the welding difficulty of the valve tube and the cap, and achieve high welding quality. It solves the problem of difficult laser welding of the valve tube and the cap, resulting in high welding strength between the valve tube and the cap. In addition, it has the advantages of simple structure and low welding cost. Furthermore, the valve tube and the cap are first connected by crimping, and then the capillary tube, the cap, and the valve tube can be welded together as a whole by furnace welding. That is, during the furnace welding process, the cap and the valve tube are welded and fixed by the first welding ring and circumferentially sealed, and the capillary tube and the cap are welded and fixed by the second welding ring and circumferentially sealed. It has the advantages of convenient welding, low welding cost, and high welding reliability.

[0007] In one possible implementation, the filter structure includes a filter screen, the outer edge of which is welded to the end of the first annular fold away from the cover. With this structure, when fluid flows through the filter screen, the filter screen can filter impurities in the fluid. In addition, the filter screen is pre-welded to the end of the first annular fold away from the cover, and the filter screen can be welded to the end of the first annular fold away from the cover by resistance welding.

[0008] In one possible implementation, a gap is left between one end of the capillary and the filter screen. With this structure, when one end of the capillary is welded and fixed to the inner circumferential wall of the first annular folded edge via the second welding ring, the solder of the second welding ring can be prevented from seeping into the filter screen along one end of the capillary, thereby preventing the filter screen from being blocked by the solder.

[0009] In one possible implementation, a second annular fold is provided on the end of the first annular fold away from the cap, which is folded inward in the radial direction of the first annular fold. A through hole is formed on the inner side of the second annular fold, and one end of the capillary is tightly abutted against the second annular fold. With this structure, after one end of the capillary is inserted into the first annular fold, the end of the capillary can eventually abut against the second annular fold, thereby limiting the capillary and the cap, so as to limit the depth of the one end of the capillary inserted into the cap.

[0010] In one possible implementation, the filter structure includes a filter screen, with a flared portion at one end of the capillary tube. The filter screen is embedded in the flared portion, and both the inner end of the flared portion and the open end of the filter screen are tightly abutted against the second annular folded edge. With this structure, the filter screen can be easily assembled into the flared portion, and since both the inner end of the flared portion and the open end of the filter screen are tightly abutted against the second annular folded edge, reliable positioning of the filter screen can be achieved.

[0011] In one possible implementation, the filter structure includes a filter screen, the outer edge of which is in close contact with the inner edge of the first annular fold, and the outer edge of the filter screen is pressed against the second annular fold at one end of the capillary tube; by adopting this structure, the filter screen can be reliably assembled inside the first annular fold, and has the advantage of easy assembly of the filter screen and the cap.

[0012] In one possible implementation, an annular groove is provided on the inner peripheral wall of the first annular fold. With the provision of the annular groove, when one end of the capillary is welded and fixed to the inner peripheral wall of the first annular fold via the second welding ring, the annular groove can block the solder of the second welding ring from flowing to the filter screen, thereby preventing the filter screen from being blocked by the solder.

[0013] In one possible implementation, the filter structure includes a filter screen, the outer edge of which is welded to the end of the second annular fold away from the first annular fold. With this structure, the filter screen can be reliably fixed to the end of the second annular fold away from the first annular fold. In addition, the filter screen is pre-welded to the end of the second annular fold away from the first annular fold. The filter screen can be welded to the end of the second annular fold away from the first annular fold by resistance welding.

[0014] In one possible implementation, the outer peripheral wall of the cap is provided with a textured pattern. By providing the textured pattern on the outer peripheral wall of the cap, when the cap and the end of the pilot valve tube are welded by the solder of the first welding ring, the fluidity of the solder of the first welding ring when melting can be enhanced, so that the solder of the first welding ring flows into the gap between the cap and the pilot valve tube, so that the solder of the first welding ring fills the gap between the cap and the pilot valve tube more evenly, and achieves reliable welding of the cap and the pilot valve tube, and can improve the reliability of the circumferential sealing of the cap and the pilot valve tube by the solder of the first welding ring.

[0015] A four-way directional valve, comprising the above-mentioned capillary tube and pilot valve tube connection structure. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the present invention when the technical solution of Embodiment 1 is adopted;

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention when the technical solution of Embodiment 2 or Embodiment 3 is adopted;

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention when the technical solution of Embodiment 4 is adopted;

[0019] Figure 4 This is a cross-sectional structural diagram of the present invention when the technical solution of Embodiment 5 is adopted;

[0020] Figure 5 This is a first three-dimensional structural diagram of the cap when the technical solution of Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5 is adopted in this utility model;

[0021] Figure 6 This is a second three-dimensional structural diagram of the cap when the technical solution of Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5 is adopted in this utility model;

[0022] Figure 7 This is a three-dimensional structural diagram of the cap when the technical solution of Embodiment Six is ​​adopted in this utility model. Detailed Implementation

[0023] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0024] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0025] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] See Figure 1 As shown in the figure, this application discloses a capillary tube and pilot valve tube connection structure, including a capillary tube 1, a pilot valve tube 2 and a cap 3; the cap 3 is tightly fitted in one end of the pilot valve tube 2, and an annular flange 31 is provided on the outer end of the cap 3, which is folded outward along the radial direction of the cap 3. A first welding ring 4 is sleeved on the outside of the cap 3. The first welding ring 4 abuts against the inner side wall of the annular flange 31 and one end of the cap 3. The cap 3 and the pilot valve tube 2 are welded and fixed and circumferentially sealed by the first welding ring 4. The inner end of the cap 3 is coaxially provided with a first annular fold 32 that folds away from the cap 3 along the axial direction of the cap 3. One end of the capillary tube 1 is inserted into the first annular fold 32 and is tightly fitted with the first annular fold 32. A second welding ring 5 is sleeved on the outside of the capillary tube 1. The second welding ring 5 is tightly abutted against the inner end face of the cap 3. The capillary tube 1 and the cap 3 are welded and fixed by the second welding ring 5 and are circumferentially sealed. A filter structure is provided on the communication path between the capillary tube 1 and the pilot valve tube 2.

[0029] The filter structure includes a filter screen 6, the outer edge of which is welded and fixed to the end of the first annular folded edge 32 away from the cover 3. With this structure, when the fluid flows through the filter screen, the filter screen can filter impurities in the fluid. In addition, the filter screen is pre-welded and fixed to the end of the first annular folded edge away from the cover. The filter screen can be welded and fixed to the end of the first annular folded edge away from the cover by resistance welding.

[0030] A gap is left between one end of the capillary tube 1 and the filter screen 6. By adopting this structure, when the capillary tube is fixed to the inner circumferential wall of the first annular folded edge by welding the second welding ring, the solder of the second welding ring can be prevented from seeping into the filter screen along the one end of the capillary tube, thereby preventing the filter screen from being blocked by the solder.

[0031] Example 2

[0032] See Figure 2 , Figure 5 and Figure 6 As shown, unlike Embodiment 1, a second annular fold 33 is provided on the end of the first annular fold 32 away from the cap 3, which is folded inward in the radial direction of the first annular fold 32. A through hole 34 is formed on the inner side of the second annular fold 33, and one end of the capillary 1 is tightly abutted against the second annular fold 33. With this structure, after one end of the capillary is inserted into the first annular fold, the end of the capillary can eventually be tightly abutted against the second annular fold, thereby limiting the capillary and the cap, so as to limit the depth of the capillary end inserted into the cap.

[0033] Example 3

[0034] See you again Figure 2 , Figure 5 and Figure 6 As shown, based on Embodiment 2, the filter structure includes a filter screen 6. A flared portion 11 is provided on one end of the capillary tube 1. The filter screen 6 is embedded in the flared portion 11. The inner end of the flared portion 11 and the open end of the filter screen 6 are both tightly abutted against the second annular folded edge 33. By adopting this structure, the filter screen can be easily assembled in the flared portion. Since the inner end of the flared portion and the open end of the filter screen are both tightly abutted against the second annular folded edge, reliable positioning of the filter screen can be achieved.

[0035] Example 4

[0036] See Figure 3 , Figure 5 and Figure 6As shown, based on Embodiment 2, the filter structure includes a filter screen 6. The outer edge of the filter screen 6 is in close contact with the inner edge of the first annular fold 32, and the outer edge of the filter screen 6 is pressed onto the second annular fold 33 through one end of the capillary tube 1. With this structure, the filter screen can be reliably assembled on the inner side of the first annular fold, and it has the advantage of convenient assembly of the filter screen and the cap.

[0037] An annular groove 321 is provided on the inner peripheral wall of the first annular fold 32. By providing the annular groove, when one end of the capillary is welded and fixed to the inner peripheral wall of the first annular fold via the second welding ring, the annular groove can prevent the solder of the second welding ring from flowing to the filter screen, thereby avoiding the filter screen from being blocked by the solder.

[0038] Example 5

[0039] See Figure 4 , Figure 5 and Figure 6 As shown, based on Embodiment 2, the filter structure includes a filter screen 6, the outer edge of which is welded and fixed to the end of the second annular fold 33 away from the first annular fold 32. With this structure, the filter screen can be reliably fixed to the end of the second annular fold away from the first annular fold. In addition, the filter screen is pre-welded and fixed to the end of the second annular fold away from the first annular fold. The filter screen can be welded and fixed to the end of the second annular fold away from the first annular fold by resistance welding.

[0040] Example 6

[0041] See Figure 7 As shown, based on Embodiments 1, 2, 3, 4, and 5, the outer peripheral wall of the cap 3 is provided with a textured pattern 35. By providing the textured pattern on the outer peripheral wall of the cap, when the cap and the end of the pilot valve tube are welded by the solder of the first welding ring, the fluidity of the solder of the first welding ring when it melts can be enhanced, so that the solder of the first welding ring flows into the gap between the cap and the pilot valve tube, making the solder of the first welding ring fill the gap between the cap and the pilot valve tube more evenly, and realizing reliable welding of the cap and the pilot valve tube, as well as improving the reliability of the circumferential sealing of the cap and the pilot valve tube by the solder of the first welding ring.

[0042] Example 7

[0043] A four-way directional valve, comprising the capillary tube and pilot valve tube connection structure of any one of the above embodiments 1, 2, 3, 4, 5 and 6.

[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A capillary tube and pilot valve tube connection structure, comprising a capillary tube (1), a pilot valve tube (2), and a cap (3); characterized in that: The cap (3) is tightly fitted into one end of the guide valve tube (2). An annular flange (31) folds outward along the radial direction of the cap (3) on the outer end of the cap (3). A first welding ring (4) is sleeved on the outside of the cap (3). The first welding ring (4) abuts against the inner wall of the annular flange (31) and one end of the cap (3). The cap (3) and the guide valve tube (2) are welded and fixed together by the first welding ring (4) and circumferentially sealed. A coaxial flange is provided on the inner end of the cap (3) along the radial direction of the cap (3). The first annular fold (32) is folded away from the cap (3) in the axial direction. One end of the capillary (1) is inserted into the first annular fold (32) and is tightly fitted with the first annular fold (32). A second welding ring (5) is sleeved on the outside of the capillary (1). The second welding ring (5) is tightly abutted against the inner end face of the cap (3). The capillary (1) and the cap (3) are welded and fixed by the second welding ring (5) and circumferentially sealed. A filter structure is provided on the communication path between the capillary (1) and the guide valve pipe (2).

2. The capillary tube and pilot valve tube connection structure according to claim 1, characterized in that: The filter structure includes a filter screen (6), the outer edge of which is welded and fixed to the end of the first annular fold (32) away from the cover (3).

3. The capillary tube and pilot valve tube connection structure according to claim 2, characterized in that: A gap is left between one end of the capillary (1) and the filter screen (6).

4. The capillary tube and pilot valve tube connection structure according to claim 1, characterized in that: The end of the first annular fold (32) away from the cap (3) is provided with a second annular fold (33) that folds inward along the radial direction of the first annular fold (32). A through hole (34) is formed on the inner side of the second annular fold (33), and one end of the capillary (1) is in close contact with the second annular fold (33).

5. The capillary tube and pilot valve tube connection structure according to claim 4, characterized in that: The filter structure includes a filter screen (6), and a flared part (11) is provided on one end of the capillary tube (1). The filter screen (6) is embedded in the flared part (11), and the inner end of the flared part (11) and the opening end of the filter screen (6) are both tightly abutted against the second annular fold (33).

6. The capillary tube and pilot valve tube connection structure according to claim 4, characterized in that: The filter structure includes a filter screen (6), the outer edge of which is in close contact with the inner edge of the first annular fold (32), and the outer edge of the filter screen (6) is pressed against the second annular fold (33) through one end of the capillary tube (1).

7. The capillary tube and pilot valve tube connection structure according to claim 6, characterized in that: An annular groove (321) is provided on the inner peripheral wall of the first annular fold (32).

8. The capillary tube and pilot valve tube connection structure according to claim 4, characterized in that: The filter structure includes a filter screen (6), the outer edge of which is welded and fixed to the end of the second annular fold (33) away from the first annular fold (32).

9. The capillary tube and pilot valve tube connection structure according to any one of claims 1-8, characterized in that: The outer peripheral wall of the cover (3) is provided with a lace pattern (35).

10. A four-way directional valve, characterized in that: The four-way reversing valve includes the capillary tube and pilot valve tube connection structure as described in any one of claims 1-9.

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