Improved structure of two-position four-way reversing valve

Abstract

The invention relates to the technical field of reversing valves, and discloses a two-position four-way reversing valve improved structure which comprises a first valve cover, a second valve cover, a cover plate, a reversing diaphragm and an anti-freezing diaphragm. According to the improved structure of the two-position four-way reversing valve, switching of the flow channels is achieved through the reversing diaphragm, the abrasion problem existing in a sliding valve mode is avoided, the stability of the whole structure is guaranteed, the anti-freezing diaphragm absorbs the frozen and expanded size through the elastic deformation characteristic of the anti-freezing diaphragm, the performance of the reversing valve is guaranteed, and the service life of the reversing valve is prolonged. And a new design idea is provided for the reversing valve.

Description

Technical Field

[0001] The invention relates to the technical field of reversing valves, and in particular to an improved structure of a two-position four-way reversing valve. Background Art

[0002] A conventional two-position four-way directional valve is generally a sliding valve structure. The valve body has a cylindrical inner hole, and the valve core is a cylindrical structure with steps. The valve core cooperates with the cylindrical inner hole of the valve body. The different positions of the cylindrical stepped valve core correspond to different flow channels of the valve body, thereby realizing the two-position four-way function.

[0003] The above structure has high requirements on the matching degree between the valve core and the valve body, and has low tolerance for impurities. If the valve core is sealed with a sealing ring, it will cause the sealing ring to wear when switching positions, thereby causing internal leakage and affecting the performance of the reversing valve. In addition, the existing reversing valve does not have an antifreeze function, but for certain specific occasions, such as the urea supply pump in the diesel engine selective catalytic conversion system SCR, it is necessary to consider the failure risk of the reversing valve caused by the freezing and expansion of the liquid under low temperature conditions. Summary of the invention

[0004] The object of the present invention is to provide an improved structure of a two-position four-way reversing valve to solve the problems mentioned in the above background technology and improve the structural stability and antifreeze ability of the reversing valve.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An improved structure of a two-position four-way reversing valve comprises a first valve cover, a second valve cover, a cover plate, a reversing diaphragm and an antifreeze diaphragm, wherein:

[0007] The first valve cover is arranged on the first side of the second valve cover, a first cavity and a second cavity independent of each other are arranged between the first valve cover and the second valve cover, and the first valve cover is provided with a first flow channel opening and a second flow channel opening communicating with the first cavity, and a third flow channel opening and a fourth flow channel opening communicating with the second cavity;

[0008] The second valve cover is provided with a first bypass flow channel connecting the first cavity with the third flow channel opening, and a second bypass flow channel connecting the second cavity with the second flow channel opening;

[0009] The cover plate is arranged on the second side of the second valve cover, and a third cavity communicating with the first bypass flow channel is arranged on the cover plate;

[0010] The reversing diaphragm is arranged between the first valve cover and the second valve cover, and switches between the first position and the second position under the action of an external driving force. When the reversing diaphragm is in the first position, the reversing diaphragm simultaneously seals the port of the first bypass flow channel communicating with the first cavity and the port of the second bypass flow channel communicating with the second cavity, so that the first flow channel opening is communicated with the second flow channel opening, and the third flow channel opening is communicated with the fourth flow channel opening; when the reversing diaphragm is in the second position, the reversing diaphragm simultaneously seals the port of the second flow channel opening communicating with the first cavity and the port of the third flow channel opening communicating with the second cavity, so that the first flow channel opening is communicated with the third flow channel opening through the first bypass flow channel, and the second flow channel opening is communicated with the fourth flow channel opening through the second bypass flow channel;

[0011] The antifreeze diaphragm is arranged between the second valve cover and the cover plate, and separates the first bypass flow channel from the third volume chamber. The antifreeze diaphragm is used to utilize its own elastic deformation characteristics to deviate toward the third volume chamber to absorb the expansion volume when the liquid freezes and expands.

[0012] As an optional solution, the first bypass flow channel forms an opening on the surface of the second valve cover close to the cover plate, the third cavity is formed on the surface of the cover plate close to the second valve cover, and the edge of the antifreeze diaphragm is provided with a convex edge, which is clamped by the second valve cover and the cover plate.

[0013] As an optional solution, a vent hole is provided on the cover plate to connect the third cavity with the outside.

[0014] As an optional solution, a protrusion block is provided in the first bypass flow channel to limit one side of the antifreeze diaphragm.

[0015] As an optional solution, the second bypass flow channel forms a protrusion on the surface of the second valve cover close to the cover plate, and a avoidance opening is opened on the surface of the cover plate close to the second valve cover corresponding to the protrusion.

[0016] As an optional solution, the reversing diaphragm includes a metal frame and a rubber part, the metal frame is provided with a forked part extending into the first cavity and the second cavity respectively, and the rubber part is wrapped around the surface of the forked part.

[0017] As an optional solution, the rubber part includes a central sealing part and an annular sealing part located on the outer ring of the central sealing part, a through hole is arranged between the central sealing part and the annular sealing part, the central sealing part is used to seal the port connected with the first bypass channel and the first cavity, the port connected with the second bypass channel and the second cavity, the port connected with the second channel port and the first cavity, and the port connected with the third channel port and the second cavity, and the annular sealing part is clamped by the first valve cover and the second valve cover.

[0018] As an optional solution, the external driving force is any one of electromagnetic force, spring force, hydraulic force and gas pressure.

[0019] As an optional solution, the first valve cover, the second valve cover and the cover plate are stacked in sequence, and the first valve cover, the second valve cover and the cover plate are respectively provided with fixing holes for inserting fasteners.

[0020] As an optional solution, a snap-in column is provided on the second valve cover, and two ends of the snap-in column extend toward the first valve cover and the cover plate respectively. The first valve cover and the cover plate are respectively provided with snap-in grooves that cooperate with the snap-in column.

[0021] Beneficial effects of the present invention:

[0022] The improved structure of the two-position four-way directional valve realizes the switching of the flow channel through the reversing diaphragm, avoids the wear problem existing in the sliding valve form, ensures the stability of the overall structure, and absorbs the volume of ice expansion through the antifreeze diaphragm's own elastic deformation characteristics, thereby ensuring the performance of the reversing valve, providing a new design idea for the reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : is an appearance diagram of an improved structure of a two-position four-way reversing valve provided by an embodiment of the present invention;

[0024] Figure 2 is an exploded view of an improved structure of a two-position four-way reversing valve provided by an embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of an improved structure of a two-position four-way reversing valve provided by an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of an improved structure of a two-position four-way reversing valve provided by an embodiment of the present invention;

[0027] Figure 5 is a first perspective view of a first valve cover involved in an embodiment of the present invention;

[0028] Figure 6 is a second viewing angle diagram of the first valve cover involved in the embodiment of the present invention;

[0029] Figure 7 is a first viewing angle diagram of a second valve cover involved in an embodiment of the present invention;

[0030] Figure 8 is a second viewing angle diagram of a second valve cover involved in an embodiment of the present invention;

[0031] Fig. 9 is a cross-sectional view of a reversing diaphragm according to an embodiment of the present invention.

[0032] In the attached figure:

[0033] 1. First valve cover; 11. First flow channel opening; 12. Second flow channel opening; 13. Third flow channel opening; 14. Fourth flow channel opening;

[0034] 2. second valve cover; 21. first bypass flow channel; 22. second bypass flow channel; 23. raised block; 24. raised portion;

[0035] 3. Cover plate; 31. Third cavity; 32. Air vent; 33. Avoidance;

[0036] 4. reversing diaphragm; 41. metal frame; 42. central sealing part; 43. annular sealing part; 44. through hole;

[0037] 5. Antifreeze membrane; 51. Convex edge;

[0038] 6. The first cavity;

[0039] 7. The second cavity;

[0040] 8. Fixing holes;

[0041] 9. Buckle column;

[0042] 10. Card slot. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first", "second", etc. are merely used to distinguish in description and have no special meanings.

[0048] See also Figures 1 to 9 As shown, this embodiment provides an improved structure of a two-position four-way reversing valve, comprising a first valve cover 1, a second valve cover 2, a cover plate 3, a reversing diaphragm 4 and an antifreeze diaphragm 5, wherein:

[0049] The first valve cover 1 is arranged on the first side of the second valve cover 2, and a first cavity 6 and a second cavity 7 independent of each other are arranged between the first valve cover 1 and the second valve cover 2. The first valve cover 1 is provided with a first flow channel opening 11 and a second flow channel opening 12 communicating with the first cavity 6, and a third flow channel opening 13 and a fourth flow channel opening 14 communicating with the second cavity 7;

[0050] The second valve cover 2 is provided with a first bypass flow channel 21 connecting the first cavity 6 with the third flow channel opening 13 and a second bypass flow channel 22 connecting the second cavity 7 with the second flow channel opening 12;

[0051] The cover plate 3 is arranged on the second side of the second valve cover 2, and a third cavity 31 communicating with the first bypass flow channel 21 is arranged on the cover plate 3;

[0052] The reversing diaphragm 4 is arranged between the first valve cover 1 and the second valve cover 2, and switches between the first position and the second position under the action of an external driving force. When the reversing diaphragm 4 is in the first position, the reversing diaphragm 4 simultaneously seals the port of the first bypass flow channel 21 communicating with the first cavity 6 and the port of the second bypass flow channel 22 communicating with the second cavity 7, so that the first flow channel opening 11 is connected with the second flow channel opening 12, and the third flow channel opening 13 is connected with the fourth flow channel opening 14; when the reversing diaphragm 4 is in the second position, the reversing diaphragm 4 simultaneously seals the port of the second flow channel opening 12 communicating with the first cavity 6 and the port of the third flow channel opening 13 communicating with the second cavity 7, so that the first flow channel opening 11 is connected with the third flow channel opening 13 through the first bypass flow channel 21, and the second flow channel opening 12 is connected with the fourth flow channel opening 14 through the second bypass flow channel 22;

[0053] The antifreeze diaphragm 5 is disposed between the second valve cover 2 and the cover plate 3 and separates the first bypass flow channel 21 from the third volume chamber 31. The antifreeze diaphragm 5 is used to utilize its own elastic deformation characteristics to deviate toward the third volume chamber 31 to absorb the expansion volume when the liquid freezes and expands.

[0054] Thus, the switching of the flow channel is achieved through the reversing diaphragm 4, avoiding the wear problem existing in the sliding valve form, ensuring the stability of the overall structure, and the antifreeze diaphragm 5 uses its own elastic deformation characteristics to absorb the volume of ice expansion, thereby ensuring the performance of the reversing valve.

[0055] It should be noted that the first bypass channel 21 is connected to the side wall of the third channel opening 13 and is not affected by the operation of the reversing diaphragm 4; the second bypass channel 22 is connected to the side wall of the second channel opening 12 and is also not affected by the operation of the reversing diaphragm 4.

[0056] Optionally, the first bypass channel 21 forms an opening on the surface of the second valve cover 2 close to the cover plate 3, and the third cavity 31 is formed on the surface of the cover plate 3 close to the second valve cover 2. The edge of the antifreeze diaphragm 5 is provided with a convex edge 51, and the convex edge 51 is clamped by the second valve cover 2 and the cover plate 3 to ensure the reliable installation of the antifreeze diaphragm 5 and the function of using the space of the third cavity 31 to absorb the expansion volume.

[0057] Furthermore, the cover plate 3 is provided with an air hole 32 for connecting the third cavity 31 with the outside, so as to prevent the elastic deformation of the antifreeze membrane 5 from being affected by air pressure.

[0058] Optionally, a protruding block 23 is provided in the first bypass flow channel 21 to limit one side of the antifreeze membrane 5 to prevent the antifreeze membrane 5 from blocking the first bypass flow channel 21 due to abnormal position.

[0059] Optionally, the second bypass channel 22 forms a protrusion 24 on the surface of the second valve cover 2 close to the cover plate 3, and a avoidance opening 33 is opened on the surface of the cover plate 3 close to the second valve cover 2 corresponding to the protrusion 24, so as not to affect the installation of the second valve cover 2 and the cover plate 3 and to reduce the volume of the reversing valve as much as possible.

[0060] Optionally, the reversing diaphragm 4 includes a metal frame 41 and a rubber part, the metal frame 41 is provided with a forked part extending into the first cavity 6 and the second cavity 7 respectively, and the rubber part is wrapped around the surface of the forked part.

[0061] Furthermore, the rubber part includes a central sealing part 42 and an annular sealing part 43 located on the outer ring of the central sealing part 42, and a through hole 44 is arranged between the central sealing part 42 and the annular sealing part 43. The central sealing part 42 is used to seal the port communicating with the first bypass channel 21 and the first cavity 6, the port communicating with the second bypass channel 22 and the second cavity 7, the port communicating with the second channel opening 12 and the first cavity 6, and the port communicating with the third channel opening 13 and the second cavity 7. The central sealing part 42 is equivalent to the valve core, realizing the main sealing function, and each port is provided with a raised stopper cooperating with the central sealing part 42 for sealing; the annular sealing part 43 is clamped by the first valve cover 1 and the second valve cover 2 to ensure the sealing of the first cavity 6 and the second cavity 7.

[0062] Optionally, the external driving force may be electromagnetic force, spring force, hydraulic pressure, gas pressure, etc.

[0063] Optionally, the first valve cover 1, the second valve cover 2, and the cover plate 3 are stacked in sequence, and the first valve cover 1, the second valve cover 2, and the cover plate 3 are respectively provided with fixing holes 8 for inserting fasteners.

[0064] Optionally, a snap-in column 9 is provided on the second valve cover 2 , and two ends of the snap-in column 9 extend toward the first valve cover 1 and the cover plate 3 respectively. The first valve cover 1 and the cover plate 3 are respectively provided with a snap-in groove 10 that cooperates with the snap-in column 9 .

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The improved structure of the two-position four-way reversing valve is characterized by: It comprises a first valve cover (1), a second valve cover (2), a cover plate (3), a reversing diaphragm (4) and an antifreeze diaphragm (5), wherein: The first valve cover (1) is arranged on a first side of the second valve cover (2); a first cavity (6) and a second cavity (7) which are independent of each other are arranged between the first valve cover (1) and the second valve cover (2); the first valve cover (1) is provided with a first flow channel opening (11) and a second flow channel opening (12) which are communicated with the first cavity (6), and a third flow channel opening (13) and a fourth flow channel opening (14) which are communicated with the second cavity (7); The second valve cover (2) is provided with a first bypass flow channel (21) for connecting the first cavity (6) with the third flow channel opening (13), and a second bypass flow channel (22) for connecting the second cavity (7) with the second flow channel opening (12); The cover plate (3) is arranged on the second side of the second valve cover (2), and a third cavity (31) communicating with the first bypass flow channel (21) is arranged on the cover plate (3); The reversing diaphragm (4) is arranged between the first valve cover (1) and the second valve cover (2), and switches between a first position and a second position under the action of an external driving force. When the reversing diaphragm (4) is in the first position, the reversing diaphragm (4) simultaneously seals a port connecting the first bypass flow channel (21) and the first chamber (6) and a port connecting the second bypass flow channel (22) and the second chamber (7), so that the first flow channel opening (11) is connected to the second flow channel opening (12), and the third flow channel opening (13) is connected to the second flow channel opening (14). ) is connected to the fourth flow channel opening (14); when the reversing diaphragm (4) is in the second position, the reversing diaphragm (4) simultaneously seals the port of the second flow channel opening (12) connected to the first chamber (6) and the port of the third flow channel opening (13) connected to the second chamber (7), so that the first flow channel opening (11) is connected to the third flow channel opening (13) through the first bypass flow channel (21), and the second flow channel opening (12) is connected to the fourth flow channel opening (14) through the second bypass flow channel (22); The antifreeze diaphragm (5) is arranged between the second valve cover (2) and the cover plate (3) and separates the first bypass flow channel (21) from the third volume chamber (31). The antifreeze diaphragm (5) is used to utilize its own elastic deformation characteristics to deflect toward the third volume chamber (31) to absorb the expansion volume when the liquid freezes and expands.

2. The improved structure of the two-position four-way reversing valve according to claim 1 is characterized in that: The first bypass flow channel (21) forms an opening on the surface of the second valve cover (2) close to the cover plate (3), the third cavity (31) is formed on the surface of the cover plate (3) close to the second valve cover (2), and the edge of the antifreeze membrane (5) is provided with a convex edge (51), and the convex edge (51) is clamped by the second valve cover (2) and the cover plate (3).

3. The improved structure of the two-position four-way reversing valve according to claim 1 is characterized in that: The cover plate (3) is provided with an air hole (32) for connecting the third cavity (31) with the outside.

4. The improved structure of the two-position four-way reversing valve according to claim 1 is characterized in that: The first bypass flow channel (21) is provided with a protruding block (23) for limiting one side of the antifreeze membrane (5).

5. The improved structure of the two-position four-way reversing valve according to claim 1 is characterized in that: The second bypass flow channel (22) forms a protrusion (24) on the surface of the second valve cover (2) close to the cover plate (3), and a relief opening (33) is provided on the surface of the cover plate (3) close to the second valve cover (2) corresponding to the protrusion (24).

6. The improved structure of the two-position four-way reversing valve according to claim 1 is characterized in that: The reversing diaphragm (4) comprises a metal frame (41) and a rubber part, the metal frame (41) is provided with a forked part extending into the first cavity (6) and the second cavity (7) respectively, and the rubber part is wrapped around the surface of the forked part.

7. The improved structure of the two-position four-way reversing valve according to claim 6 is characterized in that: The rubber part comprises a central sealing part (42) and an annular sealing part (43) located on the outer ring of the central sealing part (42); a through hole (44) is provided between the central sealing part (42) and the annular sealing part (43); the central sealing part (42) is used to seal a port communicating with the first bypass flow channel (21) and the first cavity (6), a port communicating with the second bypass flow channel (22) and the second cavity (7), a port communicating with the second flow channel opening (12) and the first cavity (6), and a port communicating with the third flow channel opening (13) and the second cavity (7); the annular sealing part (43) is clamped by the first valve cover (1) and the second valve cover (2).

8. The improved structure of the two-position four-way reversing valve according to claim 1 is characterized in that: The external driving force is any one of electromagnetic force, spring force, hydraulic force and gas pressure.

9. The improved structure of the two-position four-way reversing valve according to claim 1 is characterized in that: The first valve cover (1), the second valve cover (2) and the cover plate (3) are stacked in sequence, and the first valve cover (1), the second valve cover (2) and the cover plate (3) are respectively provided with fixing holes (8) for inserting fasteners.

10. The improved structure of the two-position four-way reversing valve according to claim 1, characterized in that: The second valve cover (2) is provided with a snap-on column (9), the two ends of which extend toward the first valve cover (1) and the cover plate (3) respectively, and the first valve cover (1) and the cover plate (3) are respectively provided with snap-on grooves (10) for engaging with the snap-on column (9).

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