Pilot valve and four-way reversing valve with same

Abstract

The utility model provides a pilot valve and a four-way reversing valve with the pilot valve. The pilot valve comprises a sleeve, an end cover, a capillary tube and a cap-shaped filter screen. The end cover is fixed to the inner side of one end of the sleeve and circumferentially sealed with the sleeve, a through hole is formed in the middle of the end cover in the axial direction, one end of the capillary tube penetrates through the through hole, and the outer wall of the capillary tube and the hole wall of the through hole are fixed and circumferentially sealed. The periphery of the through hole extends in the axial direction of the end cover to form a flange, and the outer wall of the capillary tube and the inner wall of the flange are fixed and sealed in the circumferential direction. The filter screen is connected to one end of the capillary tube; the four-way reversing valve comprises the pilot valve. The fixing firmness and reliability of the capillary tube and the end cover can be improved, and the situation that the capillary tube is separated from the end cover can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration control, in particular to a pilot valve and a four-way reversing valve having the same. Background Art

[0002] The four-way valve reversing valve (hereinafter referred to as the four-way valve) is mainly used in heat pump air conditioners, water heaters and other systems. It is mainly used to switch the flow direction of the refrigerant flow channel in the system, thereby realizing the cooling, heating, defrosting and other functions of the entire system; among them, the pilot valve is the core component of the four-way valve, and its working reliability is the guarantee for realizing the basic functions of the reversing valve.

[0003] At present, China Patent Publication No.: CN104075013B discloses a pilot valve and a four-way valve, the pilot valve includes a conduit, a filter, an end cover and a capillary tube; the filter includes a cap-shaped filter screen, one end of the capillary tube has a filter receiving portion, the filter is received in the filter receiving portion, the diameter of the filter receiving portion is larger than the diameter of the capillary main pipeline; the edge of the end cover is fixedly connected to one end of the conduit, the end cover has a support portion for blocking the filter, the filter receiving portion cooperates with the support portion, and the support portion is provided with a flow hole for passing the refrigerant; the pilot valve is provided with a filter receiving portion at one end of the capillary tube, the filter is clamped in the filter receiving portion, the end cover has a support portion for blocking the filter, the filter receiving portion cooperates with the support portion, the connection strength between the filter and the end cover can be improved, and the filter size is small, which can reduce the production cost.

[0004] However, in the pilot valve structure disclosed in the above-mentioned comparative document, since the diameter and wall thickness of the capillary are relatively small, and the capillary is connected only by the end portion being plugged in and fixed with the end cover, there are disadvantages of poor fixing firmness and reliability between the capillary and the end cover, which easily causes the capillary to detach from the end cover. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a pilot valve and a four-way reversing valve having the same, which can improve the fixing firmness and reliability of the capillary tube and the end cover and can effectively prevent the capillary tube from being separated from the end cover.

[0006] The utility model provides a pilot valve, comprising a sleeve, an end cover, a capillary tube and a cap-shaped filter screen; the end cover is fixed on the inner side of one end of the sleeve and is circumferentially sealed with the sleeve, a through hole is arranged in the middle of the end cover in the axial direction, one end of the capillary tube is penetrated in the through hole, the outer wall of the capillary tube is fixed to the hole wall of the through hole and is circumferentially sealed; the periphery of the through hole extends along the axial direction of the end cover to form a flange, the outer wall of the capillary tube is fixed to the inner wall of the flange and is circumferentially sealed; the filter screen is connected to one end of the capillary tube.

[0007] After the utility model adopts the above structure, since one end of the capillary is inserted into the through hole and the outer wall of the capillary is fixed to the hole wall of the through hole and circumferentially sealed, the contact area between the capillary and the fixed part of the end cover can be increased, that is, the capillary and the end cover can be reliably fixed. In addition, a flange extending along the axial direction of the end cover is provided at the periphery of the through hole, and the outer wall of the capillary is fixed to the inner wall of the flange and circumferentially sealed, thereby further increasing the contact area between the capillary and the fixed part of the end cover, that is, the capillary and the end cover can be reliably fixed, and the capillary can be effectively prevented from detaching from the end cover.

[0008] In a possible embodiment, the outer edge of the end cover extends along the axial direction of the end cover to form a folded edge, and the folded edge is fixed to the inner wall of the sleeve and circumferentially sealed; by adopting this structure, under the action of the folded edge, the contact area between the end cover and the sleeve can be increased, so that after the outer edge of the end cover and the outer peripheral wall of the folded edge are fixed to the inner wall of the sleeve by welding, the fixing firmness of the end cover and the sleeve can be improved.

[0009] In a possible embodiment, the open end of the filter screen is sleeved on the outer wall of one end of the capillary tube and is circumferentially fixed to the one end of the capillary tube; by adopting this structure, the open end of the filter screen can be reliably fixed to the one end of the capillary tube, and the open end of the filter screen is fixed to the one end of the capillary tube by welding.

[0010] In a possible embodiment, the open end of the filter screen abuts against the inner side of the end cover and is circumferentially fixed; by adopting this structure, the filter screen can be fixed to one end of the capillary tube and the inner wall of the end cover, thereby improving the fixing firmness of the filter screen. In addition, the open end of the filter screen is circumferentially fixed to the inner side of the end cover by welding.

[0011] In a possible embodiment, the pilot valve also includes a connecting sleeve, which is arranged on the outside of the opening end of the filter screen, and the inner wall of the connecting sleeve is in contact with the outer wall of the opening end of the filter screen, and the connecting sleeve, the opening end of the filter screen and the outer wall of one end of the capillary tube are all circumferentially fixed; by adopting this structure, under the action of the connecting sleeve, the radial limitation of the opening end of the filter screen can be achieved, and after the connecting sleeve, the opening end of the filter screen and the outer wall of one end of the capillary tube are all circumferentially fixed, the fixing firmness of the opening end of the filter screen and one end of the capillary tube can be further improved. In addition, the connecting sleeve, the opening end of the filter screen and one end of the capillary tube are fixed together by welding.

[0012] In a possible embodiment, one end of the connecting sleeve facing the end cover abuts against the inner side of the end cover and is circumferentially fixed; by adopting this structure, after the one end of the connecting sleeve facing the end cover is circumferentially fixed to the inner side of the end cover, the connecting sleeve, the open end of the filter screen, one end of the capillary tube and the inner side wall of the end cover can be fixed together, thereby further improving the fixing firmness of the filter screen. In addition, the one end of the connecting sleeve facing the end cover is circumferentially fixed to the inner side of the end cover by welding.

[0013] A four-way reversing valve comprises the above-mentioned pilot valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0015] Figure 2 for Figure 1 Schematic diagram of the structure after enlarging point A in the middle. DETAILED DESCRIPTION

[0016] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0017] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0018] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0019] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] See also Figure 1-2As shown, an embodiment of the present application discloses a pilot valve, comprising a sleeve 1, an end cover 2, a capillary 3 and a cap-shaped filter screen 4; the end cover 2 is fixed to the inner side of one end of the sleeve 1 and is circumferentially sealed with the sleeve 1, a through hole 21 is provided in the middle part of the end cover 2 in the axial direction, one end of the capillary 3 is inserted into the through hole 21, and the outer wall of the capillary 3 is fixed to the hole wall of the through hole 21 and is circumferentially sealed; the periphery of the through hole 21 extends along the axial direction of the end cover 2 to form a flange 22, and the outer wall of the capillary 3 is fixed to the inner wall of the flange 22 and is circumferentially sealed; the filter screen 4 is connected to one end of the capillary 3; the outer wall of the capillary is welded and fixed to the hole wall of the through hole and is circumferentially sealed, and the outer wall of the capillary is welded and fixed to the inner wall of the flange and is circumferentially sealed.

[0021] The outer edge of the end cover 2 extends along the axial direction of the end cover 2 to form a folded edge 23, which is fixed to the inner wall of the sleeve 1 and circumferentially sealed; by adopting this structure, the contact area between the end cover and the sleeve can be increased under the action of the folded edge, so that after the outer edge of the end cover and the outer peripheral wall of the folded edge are fixed to the inner wall of the sleeve by welding, the fixing firmness of the end cover and the sleeve can be improved.

[0022] The open end of the filter screen 4 is sleeved on the outer wall of one end of the capillary tube 3 and circumferentially fixed to the one end of the capillary tube 3; by adopting this structure, the open end of the filter screen can be reliably fixed to the one end of the capillary tube, and the open end of the filter screen is fixed to the one end of the capillary tube by welding.

[0023] The open end of the filter screen 4 is abutted against the inner side of the end cover 2 and circumferentially fixed; by adopting this structure, the filter screen can be fixed to one end of the capillary tube and the inner wall of the end cover, thereby improving the fixing firmness of the filter screen. In addition, the open end of the filter screen is circumferentially fixed to the inner side of the end cover by welding.

[0024] The pilot valve also includes a connecting sleeve 5, which is sleeved on the outside of the open end of the filter screen 4, and the inner wall of the connecting sleeve 5 is in contact with the outer wall of the open end of the filter screen 4. The connecting sleeve 5 and the open end of the filter screen 4 and the outer wall of one end of the capillary tube 3 are all circumferentially fixed. By adopting this structure, under the action of the connecting sleeve, the radial limitation of the open end of the filter screen can be achieved, and after the connecting sleeve and the open end of the filter screen and the outer wall of one end of the capillary tube are all circumferentially fixed, the fixing firmness of the open end of the filter screen and one end of the capillary tube can be further improved. In addition, the connecting sleeve, the open end of the filter screen and one end of the capillary tube are fixed together by welding.

[0025] One end of the connecting sleeve 5 facing the end cover 2 abuts against the inner side of the end cover 2 and is circumferentially fixed; by adopting this structure, after the end of the connecting sleeve facing the end cover is circumferentially fixed to the inner side of the end cover, the connecting sleeve, the open end of the filter screen, one end of the capillary tube and the inner side wall of the end cover can be fixed together, thereby further improving the fixing firmness of the filter screen. In addition, the end of the connecting sleeve facing the end cover is circumferentially fixed to the inner side of the end cover by welding.

[0026] A four-way reversing valve comprises the above-mentioned pilot valve.

[0027] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A pilot valve, comprising a sleeve (1), an end cover (2), a capillary tube (3) and a cap-shaped filter screen (4); the end cover (2) is fixed to the inner side of one end of the sleeve (1) and is circumferentially sealed with the sleeve (1); a through hole (21) is provided in the middle of the end cover (2) in the axial direction, characterized in that: One end of the capillary tube (3) is inserted into the through hole (21), and the outer wall of the capillary tube (3) is fixed to the hole wall of the through hole (21) and is circumferentially sealed; the periphery of the through hole (21) extends along the axial direction of the end cover (2) to form a flange (22), and the outer wall of the capillary tube (3) is fixed to the inner wall of the flange (22) and is circumferentially sealed; the filter screen (4) is connected to one end of the capillary tube (3).

2. The pilot valve according to claim 1, characterized in that: The outer edge of the end cover (2) extends along the axial direction of the end cover (2) to form a folded edge (23), and the folded edge (23) is fixed to the inner wall of the sleeve (1) and circumferentially sealed.

3. The pilot valve according to claim 1 or 2, characterized in that: The open end of the filter screen (4) is sleeved on the outer wall of one end of the capillary tube (3) and is circumferentially fixed to the one end of the capillary tube (3).

4. The pilot valve according to claim 3, characterized in that: The open end of the filter screen (4) abuts against the inner side of the end cover (2) and is circumferentially fixed.

5. The pilot valve according to claim 3, characterized in that: The pilot valve further comprises a connecting sleeve (5), the connecting sleeve (5) being sleeved on the outside of the opening end of the filter screen (4), the inner wall of the connecting sleeve (5) being in contact with the outer wall of the opening end of the filter screen (4), and the connecting sleeve (5) and the opening end of the filter screen (4) and the outer wall of one end of the capillary tube (3) being circumferentially fixed.

6. The pilot valve according to claim 5, characterized in that: One end of the connecting sleeve (5) facing the end cover (2) abuts against the inner side of the end cover (2) and is circumferentially fixed.

7. A four-way reversing valve, characterized in that: The four-way reversing valve comprises a pilot valve as described in any one of claims 1-6.

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