Multi-way valve

Abstract

The utility model discloses a multi-way valve which comprises a valve cover, a valve body, a valve element assembly, a sealing gasket, a limiting cover and a pressing piece. The valve element assembly is located in an inner cavity formed by the valve body and the valve deck in a matched mode. The sealing gasket is located between the valve element assembly and the valve body. The limiting cover is located between the valve element assembly and the valve deck, the center column of the valve element assembly is sleeved with the limiting cover through a first through hole, the limiting cover is connected with the valve element assembly or the valve deck through a plurality of first limiting parts, and the pressing piece is contained in an annular limiting groove. The pressing piece can generate force opposite to the stress direction of the pressing piece so that the sealing gasket can be attached to the valve element assembly and the valve body. The sealing performance among the valve element assembly, the sealing gasket and the inner bottom face of the valve body can be guaranteed under the conditions that the magnitude of interference is not increased and the size precision of materials is not further compressed, and the problem of leakage in the multi-way valve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of disc valves, in particular to a multi-way valve. Background Art

[0002] A multi-way valve generally includes a valve seat, a valve body, a valve cover, a valve core assembly and a sealing gasket. The valve core assembly can be relatively rotatably arranged in an internal cavity formed by the valve body and the valve cover, and the sealing gasket is located between the valve core assembly and the valve body. When the multi-way valve is working, the liquid enters the internal cavity through the valve body and passes through the valve core assembly before flowing out of the valve through the valve body. In this process, since the liquid turns inside the valve, it will exert a thrust upward away from the valve body on the valve core assembly, thereby causing the sealing effect of the sealing gasket to deteriorate and internal leakage to occur.

[0003] In new energy vehicles, leakage inside multi-way valves is a problem that needs to be improved. Utility Model Content

[0004] In view of this, the utility model provides a multi-way valve, which can solve the technical problem of internal leakage of the multi-way valve.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A multi-way valve, comprising:

[0007] Valve cover;

[0008] A valve body, wherein the valve body and the valve cover are cooperatively connected to form an internal cavity;

[0009] A valve core assembly, the valve core assembly is relatively rotatably disposed in the internal cavity;

[0010] A sealing gasket, the sealing gasket is arranged between the valve core assembly and the valve body;

[0011] A limiting cover, the limiting cover is located between the top of the valve core assembly and the valve cover, and is provided with a first through hole, a plurality of first limiting portions, and an annular limiting groove; the first through hole is sleeved outside the center column of the valve core assembly; the plurality of first limiting portions are located radially outside the first through hole, are sequentially arranged around the circumference of the first through hole, and are sleeved and connected with a second limiting portion located on the top surface of the valve core assembly or on the inner top surface of the valve cover; the annular limiting groove is located radially outside the first limiting portion;

[0012] A pressing piece, which is located at the top of the valve core assembly and in the annular limiting groove, can generate a force opposite to its own force direction so that the sealing gasket fits with the valve core assembly and the valve body respectively.

[0013] Optionally, in the above-mentioned multi-way valve, the first limiting portion is sleeve-connected with the second limiting portion located on the top surface of the valve core assembly; the clamping member is located between the top surface of the valve core assembly and the limiting cover, and the valve cover, the limiting cover, the clamping member, and the valve core assembly are abutted in sequence.

[0014] Optionally, in the above-mentioned multi-way valve, the inner top surface of the valve cover is provided with a first abutting portion for abutting against the limiting cover, and the first abutting portion is located radially inward of the pressing member.

[0015] Optionally, in the above-mentioned multi-way valve, the inner top surface of the valve cover is provided with a second abutment portion for abutting against the limit cover, and the projection of the second abutment portion on the rotation plane of the valve core assembly at least partially overlaps with the projection of the clamping member on the rotation plane.

[0016] Optionally, in the above multi-way valve, a surface where the first abutting portion abuts against the limiting cover is provided with a wear-resistant layer; and / or a surface where the second abutting portion abuts against the limiting cover is provided with a wear-resistant layer.

[0017] Optionally, in the above-mentioned multi-way valve, the first limiting portion is sleeve-connected with the second limiting portion located on the inner top surface of the valve cover; the clamping member is located between the inner top surface of the valve cover and the limiting cover, and the valve cover, the clamping member, the limiting cover, and the valve core assembly are abutted in sequence.

[0018] Optionally, in the above-mentioned multi-way valve, the top surface of the valve core assembly is provided with a third abutment portion for abutting against the limit cover, and the projection of the third abutment portion on the rotation plane of the valve core assembly at least partially overlaps with the projection of the clamping member on the rotation plane.

[0019] Optionally, in the above-mentioned multi-way valve, a top surface of the valve core assembly is provided with a fourth abutting portion for abutting against the limit cover, and the fourth abutting portion is located radially inward of the clamping member.

[0020] Optionally, in the above-mentioned multi-way valve, a surface of the third abutting portion for abutting against the limiting cover is provided with a wear-resistant layer.

[0021] Optionally, in the above-mentioned multi-way valve, a surface of the fourth abutting portion for abutting against the limiting cover is provided with a wear-resistant layer.

[0022] Optionally, in the above-mentioned multi-way valve, the limit cover includes: a cylindrical side wall; a central positioning plate, located inside one end of the cylindrical side wall and connected thereto, and provided with the first through hole and the first limit portion; an annular abutment plate, located outside the other end of the cylindrical side wall and connected thereto, and the annular abutment plate is provided with the annular limit groove on one side close to the central positioning plate.

[0023] Optionally, in the above-mentioned multi-way valve, the first limiting portion includes an axial through hole, and the second limiting portion includes a first cylinder adapted to the axial through hole; or, the first limiting portion includes a second cylinder, and the second limiting portion includes an axial blind hole adapted to the second cylinder.

[0024] Optionally, in the above-mentioned multi-way valve, the pressing member includes any one or more combinations of a wave spring, a rubber pad, and mutually repelling magnets.

[0025] Compared with the prior art, the multi-way valve provided by the utility model can adjust the distance between the valve cover and the valve core assembly by using the inherent characteristics of the pressing member in the sealing adjustment member without increasing the interference and further compressing the dimensional accuracy of the material, that is, without increasing the dimensional accuracy of the material, and without increasing the extrusion force on the sealing gasket when it is squeezed and deformed, but by adding a sealing adjustment member on the top of the valve core assembly, the distance between the valve cover and the valve core assembly can be adjusted by using the inherent characteristics of the pressing member in the sealing adjustment member, and at the same time, the hard contact between the valve cover and the valve core assembly is changed to a flexible abutment. The flexibility means that when the valve core assembly is squeezed by the sealing adjustment member, its squeezing force can be adaptively and automatically adjusted by the inherent characteristics of the pressing member. For example, when the thickness of the sealing gasket changes or the distance between the valve cover and the valve body changes, the distance between the valve cover and the valve core assembly changes. At this time, the pressing member can adaptively and automatically adjust its squeezing force on the valve core assembly, which is conducive to ensuring that the sealing gasket is evenly and continuously stressed, ensuring that the valve core assembly, the sealing gasket and the bottom surface of the valve body maintain a good sealing effect, and reducing or even avoiding the problem of leakage in the multi-way valve. Moreover, in the multi-way valve, since the limit cover is connected to the top surface of the valve core assembly or to the inner top surface of the valve cover through the first limit portion arranged circumferentially, the limit cover can be guided to be stably installed between the valve cover and the valve core assembly, ensuring that the clamping piece is stably clamped between the limit cover and the valve cover, or is stably clamped between the limit cover and the valve core assembly, and is not easy to tilt, thereby ensuring that the clamping piece is subjected to uniform force in the circumferential direction. In the process of squeezing the valve core assembly and then squeezing the sealing gasket through the clamping piece, the annular frame of the sealing gasket can be respectively fitted with the valve core assembly and the valve body, so that the extrusion force on the sealing gasket is evenly distributed along the circumference, so that the sealing gasket is evenly compressed by uniform force, ensuring that a good sealing effect can be achieved at all circumferential positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 An exploded view of a multi-way valve provided in the first specific embodiment of the utility model.

[0028] Figure 2 for Figure 1 Cross-sectional view of the multi-way valve in FIG.

[0029] Figure 3 An exploded view of a multi-way valve provided in the second specific embodiment of the utility model.

[0030] Figure 4 for Figure 3 Cross-sectional view of the multi-way valve in FIG.

[0031] Figure 5 It is a schematic structural diagram of the limiting cover in the multi-way valve provided in the first specific embodiment and the second specific embodiment of the utility model.

[0032] Figure 6 This is a schematic structural diagram of an upper cover in a multi-way valve provided in a second specific embodiment of the utility model.

[0033] in:

[0034] 1-valve cover, 2-pressing piece, 3-limiting cover,

[0035] 4-valve core assembly, 5-sealing gasket, 6-valve body, 7-drive shaft,

[0036] 31-first limiting portion, 32-first through hole,

[0037] 33-center positioning plate, 34-cylindrical side wall,

[0038] 35-first annular surface, 36-annular abutment plate,

[0039] 41-valve disc, 42-driving part, 61-center column,

[0040] 100- second limiting part,

[0041] 200 - first abutting portion, 300 - second abutting portion, 400 - third abutting portion. DETAILED DESCRIPTION

[0042] In new energy vehicles, leakage inside multi-way valves is a problem that needs to be improved. In existing solutions, the sealing effect is often achieved by using interference with the amount of interference. For example, when the valve cover and the valve body are connected, the valve core assembly is squeezed through the valve cover, thereby squeezing the sealing gasket at the bottom of the valve core assembly to achieve sealing at this position. However, if the dimensional accuracy of any of the valve cover, valve body, and sealing gasket is not achieved (for example, the relative displacement of the valve cover and valve body in the axial direction is insufficient when the valve cover and valve body are connected, the thickness of the sealing gasket is insufficient or the thickness of the sealing gasket is uneven), it may cause the sealing gasket to be insufficiently or unevenly stressed, which may lead to problems such as inadequate sealing of the valve cover and the valve body when the sealing gasket is used to seal.

[0043] To avoid the above problems, conventional solutions include: ① improving the dimensional accuracy of the materials; ② increasing the thickness of the gasket; ③ increasing the relative axial displacement of the valve cover and valve body when they are connected (i.e. increasing the interference fit), thereby increasing the deformation of the gasket and increasing the extrusion force when the valve cover and valve body are connected to extrude and deform the gasket.

[0044] However, during the rotation of the valve core assembly relative to the valve body and the valve cover, the valve core assembly, the gasket, and the bottom surface of the valve body have a large extrusion force, so the gasket is prone to wear, resulting in internal leakage in the multi-way valve. If the thickness of the gasket is further increased, or the relative axial displacement of the valve cover and the valve body is increased when they are connected, the extrusion force on the gasket when it is squeezed and deformed will inevitably increase, which is more likely to increase the wear rate of the gasket, and the multi-way valve still has a high risk of internal leakage. In addition, improving the dimensional accuracy of the parts requires further optimization of the manufacturing process and production equipment, which is not only difficult to achieve, but also costly.

[0045] Therefore, the utility model provides a multi-way valve, which can ensure the sealing between the valve core assembly, the sealing gasket and the bottom surface of the valve body without increasing the interference and further compressing the dimensional accuracy of the material, thereby solving the problem of internal leakage of the multi-way valve.

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] First specific embodiment

[0048] See also Figure 1 and Figure 2The first specific embodiment of the utility model provides a multi-way valve, which includes a valve cover 1, a valve body 6, a valve core assembly 4, a sealing gasket 5 and a sealing adjustment member, and the sealing adjustment member includes a limit cover 3 and a pressing member 2. Among them:

[0049] The valve body 6 and the valve cover 1 are connected together to form an internal cavity, and the valve core assembly 4 is relatively rotatably arranged in the internal cavity; the sealing gasket 5 is located between the bottom of the valve core assembly 4 and the inner bottom surface of the valve body 6, and the upper and lower sides of the annular frame of the sealing gasket 5 are respectively tightly fitted with the bottom of the valve core assembly 4 and the inner bottom surface of the valve body 6 to achieve sealing;

[0050] The limiting cover 3 is located between the top of the valve core assembly 4 and the valve cover 1, and is provided with a first through hole 32, a plurality of first limiting portions 31 and an annular limiting groove: the first through hole 32 is sleeved outside the central column 61 of the valve core assembly 4; the plurality of first limiting portions 31 are located radially outside the first through hole 32, are sequentially arranged around the circumference of the first through hole 32, and are sleeved and connected with the second limiting portion 100 located on the top surface of the valve core assembly 4 or on the inner top surface of the valve cover 1 (i.e., axial plug-in and circumferential clamping limit); the annular limiting groove is located radially outside the first limiting portion 31, and is used to accommodate the pressing member 2;

[0051] The pressing member 2 is located at the top of the valve core assembly 4 and in the annular limiting groove of the limiting cover 3, and can generate a force opposite to its own force direction, so that the sealing gasket 5 fits with the valve core assembly 4 and the valve body 6 respectively.

[0052] It can be seen that the multi-way valve can adjust the distance between the valve cover 1 and the valve core assembly 4 by using the inherent characteristics of the pressing member 2 in the sealing adjustment member without increasing the interference and further improving the dimensional accuracy of the material, that is, without increasing the dimensional accuracy of the material, and without increasing the extrusion force on the sealing gasket when it is squeezed and deformed, but by adding a sealing adjustment member on the top of the valve core assembly 4, the distance between the valve cover 1 and the valve core assembly 4 can be adjusted by using the inherent characteristics of the pressing member 2 in the sealing adjustment member, and at the same time, the hard contact between the valve cover 1 and the valve core assembly 4 is changed to a flexible contact. The flexibility means that when the valve core assembly 4 is squeezed by the sealing adjustment member, its squeezing force can be adaptively and automatically adjusted by the inherent characteristics of the pressing member 2. For example, when the valve core assembly is impacted by the fluid in the flow channel, causing the distance between the valve cover 1 and the valve core assembly 4 to change, the pressing member 2 can adaptively and automatically adjust its squeezing force on the valve core assembly 4, which is conducive to ensuring that the sealing gasket 5 is subjected to uniform and continuous force, ensuring that the valve core assembly 4, the sealing gasket 5 and the inner bottom surface of the valve body 6 maintain a good sealing effect, and reducing or even avoiding the problem of leakage in the multi-way valve.

[0053] Moreover, in the multi-way valve, since the limit cover 3 is limitedly connected to the top surface of the valve core assembly 4 or to the inner top surface of the valve cover 1 through the first limit portion 31 arranged circumferentially, the limit cover 3 can be guided to be stably installed between the valve cover 1 and the valve core assembly 4, ensuring that the clamping piece 2 is stably clamped between the limit cover 3 and the valve cover 1, or is stably clamped between the limit cover 3 and the valve core assembly 4, and is not easy to tilt, thereby ensuring that the clamping piece 2 is uniformly stressed in the circumferential direction, so that in the process of squeezing the valve core assembly 4 and then squeezing the sealing gasket 5 by the clamping piece 2, the annular frame of the sealing gasket 5 can be respectively fitted with the valve core assembly 4 and the valve body 6, so that the extrusion force on the sealing gasket 5 is evenly distributed along the circumference, so that the sealing gasket 5 is evenly compressed by uniform force, ensuring that a good sealing effect can be achieved at all circumferential positions.

[0054] In a specific implementation, the clamping member 2 can be any one or more combinations of a spring (such as a wave spring), a rubber pad, and a mutually repelling magnet. Moreover, the axial semi-section profile of the annular limit groove can be U-shaped, L-shaped, V-shaped, M-shaped, or any other structure that can be adapted to the clamping member 2. When the clamping member 2 is an elastic body such as a spring or a rubber pad, it squeezes the valve core assembly 4 through the restoring force generated by the deformation of the elastic body, so that a good sealing effect is maintained between the valve core assembly 4, the sealing pad 5 and the inner bottom surface of the valve body 6; when the clamping member 2 is a pair of mutually repelling magnets with the same poles arranged opposite to each other, it squeezes the valve core assembly 4 through the mutual repulsion force between the magnets (similar to the elastic force), so that a good sealing effect is maintained between the valve core assembly 4, the sealing pad 5 and the inner bottom surface of the valve body 6.

[0055] In some embodiments, Figure 1 As shown in the figure, the first limiting portion 31 is sleeve-connected with the second limiting portion 100 located on the top surface of the valve core assembly 4, the clamping member 2 is located between the top surface of the valve core assembly 4 and the limiting cover 3, and the valve cover 1, the limiting cover 3, the clamping member 2, and the valve core assembly 4 are abutted in sequence from top to bottom.

[0056] Furthermore, if Figure 2 As shown in , the inner top surface of the valve cover 1 is provided with a first abutment portion 200, which is used to abut against the first annular surface 35 located on the periphery of the first through hole 32 on the top surface of the center positioning plate 33 of the limiting cover 3. The first abutment portion 200 is located on the radial inner side of the pressing member 2. For details, see Figure 2 Contact position B in the middle. It can be seen that the first abutting portion 200 can not only maintain a suitable preset distance between the valve cover 1 and the limit cover 3, but also because the first abutting portion 200 on the inner top surface of the valve cover 1 is arranged close to the rotation center axis of the valve core assembly 4, the friction position between the valve cover 1 and the valve core assembly 4 when the valve cover 1 and the valve core assembly 4 perform relative rotational motion is relatively close to the rotation center axis of the valve core assembly 4, so the rotation resistance (mainly friction) between the first abutting portion 200 and the pressing member 2 is small, which is conducive to reducing the torsional driving force.

[0057] In some embodiments, Figure 2 As shown in , the inner top surface of the valve cover 1 is provided with a second abutment portion 300, which is used to abut against the second annular surface on the top of the annular abutment plate 36 of the limiting cover 3, and the projection of the second abutment portion 300 on the rotation plane of the valve core assembly 4 at least partially overlaps with the projection of the pressing member 2 on the rotation plane. For details, see Figure 2 The contact position A in the middle. It can be seen that the second abutting portion 300 can play a role in stably positioning the limiting cover 3, avoiding problems such as uneven force on the pressing member 2 and substandard sealing effect of the sealing pad 5 caused by the tilt of the positioning cover 3.

[0058] In specific implementation, the first abutment portion 200 and the second abutment portion 300 can be annular protrusions arranged on the inner top surface of the valve cover 1, respectively forming line contact with the top surface of the limit cover 3. Alternatively, in other embodiments, the first abutment portion 200 and / or the second abutment portion 300 can also be designed as a plurality of protrusions arranged in an annular matrix, respectively forming multi-point contact with the limit cover 3. The utility model does not specifically limit the specific structural dimensions and shapes of the first abutment portion 200 and the second abutment portion 300, as long as the above-mentioned positioning effect can be achieved.

[0059] In some embodiments, in order to avoid excessive wear between the inner top surface of the valve cover 1 and the limit cover 3 due to relative movement, a wear-resistant layer is provided on the surface of the first abutting portion 200 used to abut against the limit cover 3, and / or a wear-resistant layer is provided on the surface of the second abutting portion 300 used to abut against the limit cover 3. In addition, in some embodiments, in order to avoid wear on the limit cover 3, a wear-resistant layer can also be provided at the position where the limit cover 3 is used to contact the above-mentioned abutting portion. In specific implementation, the above-mentioned wear-resistant layer can be a wear-resistant surface provided by coating or other means, or a wear-resistant sheet installed by welding or hot-melt connection or other means, such as a wear-resistant iron sheet.

[0060] In specific implementation, during the assembly process of the multi-way valve, when the valve cover 1 and the valve body 6 are assembled and close to each other, the valve cover 1 can squeeze the limit cover 3, and then squeeze the pressing piece 2, so as to squeeze the valve core assembly 4 through the pressing piece 2. At this time, the valve core assembly 4 can squeeze the sealing gasket 5 to achieve the sealing between the valve core assembly 4, the sealing gasket 5 and the inner bottom surface of the valve body 6. Among them, since the limit cover 3 is connected to the top of the valve core assembly 4 through the first limit part 31, when the valve core assembly 4 rotates relative to the valve cover 1 and the valve body 6 around the central axis L, the limit cover 3 and the pressing piece 2 rotate together with the valve core assembly 4. At this time, the axial extrusion force between the valve core assembly 4 and the sealing gasket 5 can be evenly distributed along the circumferential direction through the flat and smooth limit cover 3, and is subjected to as little friction resistance as possible during the rotational movement.

[0061] See also Figure 1 In some embodiments, the limiting cover 3 includes a cylindrical side wall 34, a center positioning plate 33, and an annular abutment plate 36, wherein: the center positioning plate 33 is located inside one end of the cylindrical side wall 34 and is connected thereto, and is provided with the first through hole 32 and the first limiting portion 31 described above; the annular abutment plate 36 is located outside the other end of the cylindrical side wall 34 and is connected thereto, and a side of the annular abutment plate 36 close to the center positioning plate 33 is provided with an annular limiting groove for accommodating the clamping member 2.

[0062] In a specific implementation, the first limiting portion 31 mentioned herein may be an axial through hole, and the second limiting portion 100 may be a first column adapted to the axial through hole, such as Figure 1 Alternatively, in other embodiments, the first limiting portion 31 may be set as a second column, and the second limiting portion 100 may be an axial blind hole (not shown in the figure) adapted to the second column.

[0063] See also Figures 3 to 6 The second specific embodiment of the utility model provides a multi-way valve, which is different from the multi-way valve in the first specific embodiment mentioned above only in that: the first limiting portion 31 of the limiting cover 3 is sleeve-connected with the second limiting portion 100 located on the inner top surface of the valve cover 1, the pressing member 2 is located between the inner top surface of the valve cover 1 and the limiting cover 3, and the valve cover 1, the pressing member 2, the limiting cover 3, and the valve core assembly 4 are abutted in sequence. It can be seen that the multi-way valve can also use the inherent characteristics of the pressing member 2 in the sealing adjustment member to adjust the distance between the valve cover 1 and the valve core assembly 4, and can ensure that the sealing gasket 5 is uniformly and continuously stressed through the pressing member 2 and the first limiting portion 31, and ensure that the valve core assembly 4, the sealing gasket 5 and the inner bottom surface of the valve body 6 maintain a good sealing effect, thereby reducing or even avoiding the problem of internal leakage of the multi-way valve.

[0064] Further, in the multi-way valve, the top surface of the valve core assembly 4 is provided with a third abutting portion 400 for abutting against the limit cover 3, and the projection of the third abutting portion 400 on the rotation plane of the valve core assembly 4 and the projection of the pressing member 2 on the rotation plane at least partially overlap. Figure 4 and / or, the top surface of the valve core assembly 4 is provided with a fourth abutting portion for abutting against the limiting cover 3, and the fourth abutting portion is located radially inward of the pressing member 2. It can be seen that the limiting cover 3 can be positioned stably by the third abutting portion 400 and / or the fourth abutting portion, so as to avoid problems such as uneven force on the pressing member 2 and substandard sealing effect of the sealing pad 5 caused by the tilt of the positioning cover 3.

[0065] In specific implementation, the third abutment portion 400 and the fourth abutment portion can be an annular protrusion disposed on the top surface of the valve core assembly 4, respectively forming a line contact with the limit cover 3. Alternatively, in other embodiments, the third abutment portion 400 and / or the fourth abutment portion can also be designed as a plurality of protrusions arranged in an annular matrix, respectively forming a multi-point contact with the limit cover 3. The utility model does not specifically limit the specific structural dimensions and shapes of the third abutment portion 400 and the fourth abutment portion, as long as the above-mentioned positioning effect can be achieved.

[0066] Furthermore, in order to avoid excessive wear between the valve core assembly 4 and the limit cover 3 due to relative movement, a wear-resistant layer is provided on the surface of the third abutting portion 400 used to abut against the limit cover 3 and / or a wear-resistant layer is provided on the surface of the fourth abutting portion used to abut against the limit cover 3. Furthermore, in some embodiments, in order to avoid wear on the limit cover 3, a wear-resistant layer may also be provided at the position where the limit cover 3 is used to contact the above-mentioned abutting portion. In specific implementation, the above-mentioned wear-resistant layer may be a wear-resistant surface provided by coating or other means, or a wear-resistant sheet installed by welding, hot-melt connection or other means, such as a wear-resistant iron sheet.

[0067] In specific implementation, during the assembly process of the multi-way valve, when the valve cover 1 and the valve body 6 are assembled and close to each other, the valve cover 1 can squeeze the pressing piece 2, and then squeeze the limiting cover 3, so that the valve core assembly 4 is squeezed through the pressing piece 2 and the limiting cover 3. At this time, the valve core assembly 4 can squeeze the sealing gasket 5 to achieve the sealing between the valve core assembly 4, the sealing gasket 5 and the inner bottom surface of the valve body 6. Among them, since the limiting cover 3 is limitedly connected with the inner top surface of the valve cover 1 through the first limiting portion 31, when the valve core assembly 4 rotates relative to the valve cover 1 and the valve body 6 around the central axis L, the limiting cover 3 and the valve cover 1 remain stationary, and the pressing piece 2 rotates with the valve core assembly 4. At this time, the axial extrusion force between the valve core assembly 4 and the sealing gasket 5 can be evenly distributed along the circumferential direction through the flat and smooth limiting cover 3, and is subjected to as little friction resistance as possible during the rotational movement.

[0068] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed.

[0069] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-way valve, comprising: Valve cover (1); A valve body (6), wherein the valve body (6) and the valve cover (1) are connected in cooperation to form an internal cavity; A valve core assembly (4), the valve core assembly (4) being relatively rotatably disposed in the internal cavity; A sealing gasket (5), wherein the sealing gasket (5) is arranged between the valve core assembly (4) and the valve body (6); Characterized in that the multi-way valve further comprises: A limiting cover (3), the limiting cover (3) is located between the top of the valve core assembly (4) and the valve cover (1), and is provided with a first through hole (32), a plurality of first limiting portions (31) and an annular limiting groove; the first through hole (32) is sleeved outside the central column (61) of the valve core assembly (4); the plurality of first limiting portions (31) are located radially outside the first through hole (32), are arranged in sequence around the circumference of the first through hole (32), and are sleeved and connected with a second limiting portion (100) located on the top surface of the valve core assembly (4) or on the inner top surface of the valve cover (1); the annular limiting groove is located radially outside the first limiting portion (31); A pressing piece (2), the pressing piece (2) is located at the top of the valve core assembly (4) and in the annular limiting groove, and can generate a force opposite to its own force direction, so that the sealing gasket (5) fits the valve core assembly (4) and the valve body (6) respectively.

2. The multi-way valve according to claim 1, characterized in that: The first limiting portion (31) is sleeve-connected with the second limiting portion (100) located on the top surface of the valve core assembly (4); The pressing piece (2) is located between the top surface of the valve core assembly (4) and the limiting cover (3), and the valve cover (1), the limiting cover (3), the pressing piece (2), and the valve core assembly (4) are abutted in sequence.

3. The multi-way valve according to claim 2, characterized in that: The inner top surface of the valve cover (1) is provided with a first abutting portion (200) for abutting against the limiting cover (3), and the first abutting portion (200) is located radially inward of the pressing member (2); And / or, the inner top surface of the valve cover (1) is provided with a second abutment portion (300) for abutting against the limit cover (3), and the projection of the second abutment portion (300) on the rotation plane of the valve core assembly (4) at least partially overlaps with the projection of the clamping member (2) on the rotation plane.

4. The multi-way valve according to claim 3, characterized in that: The surface of the first abutting portion (200) abutting against the limiting cover (3) is provided with a wear-resistant layer; And / or, a wear-resistant layer is provided on the surface of the second abutting portion (300) abutting against the limiting cover (3).

5. The multi-way valve according to claim 1, characterized in that: The first limiting portion (31) is sleeve-connected with the second limiting portion (100) located on the inner top surface of the valve cover (1); The pressing piece (2) is located between the inner top surface of the valve cover (1) and the limiting cover (3), and the valve cover (1), the pressing piece (2), the limiting cover (3), and the valve core assembly (4) are abutted in sequence.

6. The multi-way valve according to claim 5, characterized in that: The top surface of the valve core assembly (4) is provided with a third abutting portion (400) for abutting against the limit cover (3), and the projection of the third abutting portion (400) on the rotation plane of the valve core assembly (4) at least partially overlaps with the projection of the pressing member (2) on the rotation plane; And / or, the top surface of the valve core assembly (4) is provided with a fourth abutment portion for abutting against the limit cover (3), and the fourth abutment portion is located radially inward of the clamping member (2).

7. The multi-way valve according to claim 6, characterized in that: The surface of the third abutting portion (400) for abutting against the limiting cover (3) is provided with a wear-resistant layer; And / or, a surface of the fourth abutting portion for abutting against the limiting cover (3) is provided with a wear-resistant layer.

8. The multi-way valve according to claim 1, characterized in that: The limiting cover (3) comprises: A cylindrical side wall (34); a center positioning plate (33), located inside one end of the cylindrical side wall (34) and connected thereto, and provided with the first through hole (32) and the first limiting portion (31); The annular abutment plate (36) is located outside the other end of the cylindrical side wall (34) and connected thereto, and the annular limiting groove is provided on one side of the annular abutment plate (36) close to the central positioning plate (33).

9. The multi-way valve according to claim 1, characterized in that: The first limiting portion (31) comprises an axial through hole, and the second limiting portion (100) comprises a first column adapted to the axial through hole; Alternatively, the first limiting portion (31) comprises a second column, and the second limiting portion (100) comprises an axial blind hole adapted to the second column.

10. The multi-way valve according to any one of claims 1 to 9, characterized in that: The pressing member (2) comprises any one or more combinations of a wave spring, a rubber pad, and mutually repelling magnets.

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