A rotary valve

Abstract

This application relates to a rotary valve, comprising: a valve head having a main flow channel and a first switching flow channel; multiple first switching flow channels arranged around the axis of the valve head; a bushing fixedly disposed within the valve head, forming a static seal with the bushing; the bushing having a transition flow channel and a second switching flow channel; the transition flow channel communicating with the main flow channel, and the first switching flow channels corresponding to and communicating with the second switching flow channels; a valve core rotatably disposed within the bushing, forming a dynamic seal with the bushing; the valve core having a central flow channel, a first connecting flow channel, and a second connecting flow channel; the first connecting flow channel always communicating with the central flow channel and the transition flow channel; the second connecting flow channel being used to switch the central flow channel to communicate with different second switching flow channels after the valve core rotates. This utility model reduces the processing difficulty and inspection of rotary valves, improves the wear resistance of the valve head, and reduces the cost of replacing the entire valve head.

Description

Technical Field

[0001] This application relates to the field of hydraulic system technology, and in particular to a rotary valve. Background Technology

[0002] Rotary valves enable switching between different flow channels and are frequently used as valves in hydraulic systems. Currently, rotary valves generally employ a valve core as a rotor and a valve head as a stator, switching between flow channels is achieved by driving the valve core to rotate relative to the valve head.

[0003] Because the inner wall of the valve head and the outer wall of the valve core need to rotate relative to each other and form a dynamic seal, a high degree of surface finish is required for the inner wall of the valve head. The inner bore of the valve head needs to be machined as a blind bore, which is difficult to machine with a high surface finish, and also difficult to inspect the surface finish of the inner wall of the blind bore. Furthermore, the long-term relative rotation between the valve head and the valve core will cause direct wear to the valve head, resulting in high overall replacement costs after the valve head wears out.

[0004] Therefore, there is a need to provide a rotary valve that reduces the difficulty of valve head processing and testing, and minimizes direct wear on the valve head. Utility Model Content

[0005] Therefore, it is necessary to provide a rotary valve, the specific technical solution of which is as follows.

[0006] A rotary valve, comprising:

[0007] The valve head is provided with a main flow channel and a first switching flow channel; multiple first switching flow channels are arranged around the axis of the valve head.

[0008] A bushing is fixedly installed inside the valve head to form a static seal with the bushing; the bushing is provided with a transition flow channel and a second switching flow channel; the transition flow channel is connected to the main flow channel, and the first switching flow channel and the second switching flow channel correspond one-to-one and are connected.

[0009] The valve core is rotatably mounted inside the bushing, forming a dynamic seal with the bushing; the valve core is provided with a central flow channel, a first connecting flow channel and a second connecting flow channel; the first connecting flow channel is always connected to the central flow channel and the transition flow channel; the second connecting flow channel is used to switch the central flow channel to connect with a different second switching flow channel after the valve core rotates.

[0010] Furthermore, the first connecting channel includes an annular channel and a sub-channel; the annular channel is arranged around the outer surface of the valve core; the sub-channel extends from the central channel to the annular channel.

[0011] Furthermore, the annular channel is aligned with the transition channel.

[0012] Furthermore, the second switching channel extends to the inner wall of the bushing to form a first port; the first ports of each second switching channel are located at the same horizontal level.

[0013] Furthermore, the first switching flow channel extends along the radial direction of the valve head, the second switching flow channel extends along the radial direction of the bushing, and the second connecting flow channel extends along the radial direction of the valve core; the valve head, bushing, and valve core are arranged coaxially so that the first switching flow channel, the second switching flow channel, and the second connecting flow channel are at the same horizontal height.

[0014] Furthermore, the central flow channel extends along the axis of the valve core from its end, and a sealing plug bead is provided at the end of the central flow channel near the end of the valve core.

[0015] Furthermore, the valve head is provided with a receiving cavity with one end open; a sealing gasket is provided at the bottom of the receiving cavity, the bushing abuts against the sealing gasket, and the valve core abuts against the sealing gasket.

[0016] Furthermore, a clamping nut is connected to the open end of the receiving cavity, one end of which extends into the receiving cavity and abuts against the clamping bushing, and the clamping bushing clamps the bushing.

[0017] Furthermore, a sealing lip is provided between the clamping bushing and the bushing.

[0018] Furthermore, it also includes an elastic element; the elastic element is located between the valve core and the clamping nut, and the elastic element has elastic potential energy that causes the valve core to move toward the direction of the sealing gasket.

[0019] Beneficial effects: The rotary valve provided by this utility model, by setting a bushing inside the valve head and placing the valve core inside the bushing, forms a static seal between the valve head and the bushing, and a dynamic seal between the valve core and the bushing. When switching flow channels, the valve core rotates relative to the bushing, and the flow channel between the valve head and the valve core transitions through the flow channel on the bushing, eliminating the need for direct contact between the inner wall of the valve head and the valve core. This reduces the requirements for the smoothness of the inner wall of the valve head. Furthermore, the inner hole of the bushing is a through hole, which is easier to process and inspect than a blind hole, thus reducing the processing difficulty and inspection difficulty of the rotary valve. Since the inner wall of the valve head does not directly contact the valve core, direct wear on the inner wall of the valve head due to relative rotation is avoided, improving the wear resistance of the valve head and reducing the cost of replacing the entire valve head. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the rotary valve.

[0022] Figure 2 This is a schematic diagram of the valve core;

[0023] Figure 3 This is a front view of the rotary valve;

[0024] Figure 4 for Figure 3 Sectional view along the middle AA;

[0025] Figure 5 for Figure 3 Perspective view of the center line BB;

[0026] Figure 6 This is a schematic diagram of the bushing;

[0027] Figure 7 This is a side view of the rotary valve;

[0028] Figure 8 for Figure 7 A sectional view of CC.

[0029] Explanation of reference numerals in the attached drawings: 1. Valve head; 2. Bushing; 3. Valve core; 4. Press-fit nut; 5. Press-fit bushing; 6. Sealing lip; 7. Elastic element; 8. Rotating shaft;

[0030] 11. Main flow channel; 12. First switching flow channel; 13. Main port; 14. Switching port; 15. Sealing gasket;

[0031] 21. Transition channel; 22. Second switching channel;

[0032] 31. Central flow channel; 32. First connecting flow channel; 33. Second connecting flow channel; 34. Sealing plug;

[0033] 321. Annular channel; 322. Sub-channel. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In 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.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0040] Example

[0041] Reference Figure 1 As shown, this embodiment provides a rotary valve. (Refer to...) Figure 4 As shown, the rotary valve includes a valve head 1, a bushing 2, and a valve core 3.

[0042] Continue to refer to Figure 1 and Figure 5 As shown, the valve head 1 has a main flow channel 11 and a first switching flow channel 12. There are multiple first switching flow channels 12, arranged around the axis of the valve head 1. A main port 13 communicating with the main flow channel 11 and multiple switching ports 14 communicating with each of the first switching flow channels 12 are formed on the outer surface of the valve head 1. The main port 13 and each switching port 14 are respectively connected to different external liquid paths. By rotating the valve to switch the main flow channel 11 to different first switching flow channels 12, the connection to different external liquid paths is switched.

[0043] Continue to refer to Figure 4 As shown, the bushing 2 is fixedly installed inside the valve head 1, forming a static seal with the bushing 2. Specifically, the valve head 1 can be made of PEEK material with strong chemical resistance, and the bushing 2 is interference-fitted with the valve head 1. (Refer to...) Figure 6 As shown, the bushing 2 is provided with a transition channel 21 and a second switching channel 22. The transition channel 21 is connected to the main channel 11, and the multiple second switching channels 22 are respectively connected to and correspond to multiple first switching channels 12.

[0044] Continue to refer to Figure 4As shown, the valve core 3 is rotatably disposed within the bushing 2, forming a dynamic seal with the bushing 2. In this embodiment, the valve core 3 is a ceramic cylindrical structure, and the bushing 2 is also made of ceramic material, allowing for a micro-clear gap fit between the valve core 3 and the bushing 2, with the gap value being less than 0.0001 μm. During the rotation of the valve core 3 relative to the bushing 2, liquid enters the valve core 3 and forms a liquid film between the valve core 3 and the bushing 2, thereby achieving a dynamic seal. The valve core 3 is provided with a central flow channel 31, a first connecting flow channel 32, and a second connecting flow channel 33; the first connecting flow channel 32 is always connected to the central flow channel 31 and the transition flow channel 21; the second connecting flow channel 33 is used to switch the central flow channel 31 to connect with a different second switching flow channel 22 after the valve core 3 rotates. That is, the first connecting flow channel 32 and the second connecting flow channel 33 are connected through the central flow channel 31. When rotating the valve core 3, different second switching flow channels 22 are connected to the second connecting flow channel 33, and different first switching flow channels 12 are connected to the main flow channel 11 to switch the liquid circuit.

[0045] During the fluid circuit switching process, the valve core 3 rotates relative to the bushing 2, so that the valve head 1 no longer directly contacts the valve core 3, which reduces the requirements for the smoothness of the inner wall of the valve head 1 and avoids direct wear of the valve core 3 due to relative rotation.

[0046] The rotary valve provided in this embodiment, by setting a bushing 2 inside the valve head 1 and placing the valve core 3 inside the bushing 2, forms a static seal between the valve head 1 and the bushing 2, and a dynamic seal between the valve core 3 and the bushing 2. When switching the flow path, the valve core 3 rotates relative to the bushing 2, and the flow path between the valve head 1 and the valve core 3 is transitioned through the flow path on the bushing 2, eliminating the need for direct contact between the inner wall of the valve head 1 and the valve core 3. This reduces the requirement for the smoothness of the inner wall of the valve head 1. Furthermore, the inner hole of the bushing 2 is a through hole, which is easier to process and inspect than a blind hole, thus reducing the processing difficulty and inspection difficulty of the rotary valve. Since the inner wall of the valve head 1 does not directly contact the valve core 3, direct wear on the inner wall of the valve head 1 due to relative rotation is avoided, improving the wear resistance of the valve head 1 and reducing the cost of replacing the entire valve head 1.

[0047] Specifically, refer to Figure 2 and Figure 4The first connecting flow channel 32 includes an annular channel 321 and a sub-flow channel 322. The annular channel 321 is arranged around the outer surface of the valve core 3, aligning the annular channel 321 with the transition flow channel 21 at the same horizontal level, so that the transition flow channel 21 remains connected to the annular channel 321 when the valve core 3 rotates relative to the bushing 2. The sub-flow channel 322 extends from the central flow channel 31 to the annular channel 321, thus ensuring that the transition flow channel 21 remains connected to the central flow channel 31. Since the transition flow channel 21 is connected to the main flow channel 11, the main flow channel 11 is always connected to the central flow channel 31. After the valve core 3 rotates relative to the bushing 2, the main flow channel 11 is switched to connect with different first switching flow channels 12.

[0048] Specifically, refer to Figure 5 As shown, the first switching channel 12 extends radially along the valve head 1, the second switching channel 22 extends radially along the bushing 2, and the second connecting channel 33 extends radially along the valve core 3. The valve head 1, bushing 2, and valve core 3 are arranged coaxially, so that the first switching channel 12, the second switching channel 22, and the second connecting channel 33 are at the same horizontal height. Each second switching channel 22 extends to the inner wall of the bushing 2 to form a first port; thus, the first ports of each second switching channel 22 are at the same horizontal height. The second connecting channel 33 extends to the outer wall of the valve core 3 to form a second port, so that the second port is at the same horizontal height as each first port; when the valve core 3 is rotated, the second port is switched to align with different first ports, thereby connecting the main channel 11 with different first switching channels 12.

[0049] Specifically, the central flow channel 31 extends from the end of the valve core 3 along its axis, and a sealing bead 34 is provided at the end of the central flow channel 31 near the end of the valve core 3. This facilitates the machining of the central flow channel 31 and allows the sealing bead 34 to seal the central flow channel 31.

[0050] Specifically, the valve head 1 has a receiving cavity with one open end; a sealing gasket 15 is provided at the bottom of the receiving cavity, the bushing 2 abuts against the sealing gasket 15, and the valve core 3 abuts against the sealing gasket 15. The sealing gasket 15 is used to seal the ends of the bushing 2 and the valve core 3; the sealing gasket 15 is a self-lubricating sealing gasket to reduce friction during the rotation of the valve core 3.

[0051] Specifically, refer to Figure 4 As shown, a compression nut 4 is connected to the open end of the receiving cavity. One end of the nut extends into the receiving cavity and abuts against the compression sleeve 5, which compresses the bushing 2, providing axial clamping force to the bushing 2.

[0052] Specifically, a sealing lip 6 is provided between the clamping bushing 5 and the bushing 2. This prevents impurities from entering between the bushing 2 and the valve core 3, and also prevents liquid from entering the rear end and corroding other components.

[0053] Specifically, it also includes an elastic element 7; the elastic element 7 is located between the valve core 3 and the clamping nut, and the elastic element 7 has elastic potential energy to move the valve core 3 toward the direction of the sealing gasket 15. The elastic element 7 can be a spring, which is used to press the valve core 3 to ensure that the ports can be aligned.

[0054] Specifically, the valve core 3 is connected to a rotating shaft 8 at one end away from the opening of the central flow channel 31. The rotating shaft 8 is a flexible shaft to ensure smooth cooperation between the valve core 3 and the bushing 2.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A rotary valve, characterized in that, include: The valve head is provided with a main flow channel and a first switching flow channel; multiple first switching flow channels are arranged around the axis of the valve head. A bushing is fixedly installed inside the valve head to form a static seal with the bushing; the bushing is provided with a transition flow channel and a second switching flow channel; the transition flow channel is connected to the main flow channel, and the first switching flow channel and the second switching flow channel correspond one-to-one and are connected. The valve core is rotatably mounted inside the bushing, forming a dynamic seal with the bushing; the valve core is provided with a central flow channel, a first connecting flow channel and a second connecting flow channel; the first connecting flow channel is always connected to the central flow channel and the transition flow channel; the second connecting flow channel is used to switch the central flow channel to connect with a different second switching flow channel after the valve core rotates.

2. A rotary valve according to claim 1, characterized in that, The first connecting channel includes an annular channel and a sub-channel; the annular channel is arranged around the outer surface of the valve core; the sub-channel extends from the central channel to the annular channel.

3. A rotary valve according to claim 2, characterized in that, The annular channel is aligned with the transition channel.

4. A rotary valve according to claim 1, characterized in that, The second switching channel extends to the inner wall of the bushing to form a first port; the first ports of each second switching channel are located at the same horizontal level.

5. A rotary valve according to claim 4, characterized in that, The first switching flow channel extends along the radial direction of the valve head, the second switching flow channel extends along the radial direction of the bushing, and the second connecting flow channel extends along the radial direction of the valve core; the valve head, bushing, and valve core are arranged coaxially so that the first switching flow channel, the second switching flow channel, and the second connecting flow channel are at the same horizontal height.

6. A rotary valve according to claim 1, characterized in that, The central flow channel extends along the axis of the valve core from its end, and a sealing plug bead is provided at the end of the central flow channel near the end of the valve core.

7. A rotary valve according to claim 1, characterized in that, The valve head has a receiving cavity with one end open; a sealing gasket is provided at the bottom of the receiving cavity, the bushing abuts against the sealing gasket, and the valve core abuts against the sealing gasket.

8. A rotary valve according to claim 7, characterized in that, The opening end of the receiving cavity is connected to a clamping nut, one end of which extends into the receiving cavity and abuts against the clamping bushing, and the clamping bushing clamps the bushing.

9. A rotary valve according to claim 8, characterized in that, A sealing lip is provided between the clamping bushing and the bushing.

10. A rotary valve according to claim 7, characterized in that, It also includes an elastic element; the elastic element is located between the valve core and the clamping nut, and the elastic element has elastic potential energy that causes the valve core to move toward the direction of the sealing gasket.

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