A rotary switching valve

Abstract

The application provides a rotary switching valve, which comprises a shell, a rotor, a driving unit and elastic adjusting devices, the shell is internally provided with a cavity, the rotor is located in the cavity, and the end surface of the rotor is in contact with the wall surface of the cavity to form a sealing surface; the other end surface of the rotor is provided with a pressing groove, the elastic adjusting devices are installed on the shell, and the one end of the elastic adjusting devices is in contact with the pressing groove; the elastic adjusting devices provide a pre-pressure to make the end surface of the rotor in contact with the wall surface of the cavity during rotation; the rotating shaft of the rotor is supported on the shell, and the rotating shaft is connected with the driving unit; the shell is provided with at least two flow channels, and the end surface of the rotor in contact with the wall surface of the cavity is provided with at least one connecting channel; the two flow channels are communicated or blocked through the connecting channel by rotation of the rotor; the one end of the elastic adjusting devices is in contact with the pressing groove, so that the lower end surface of the rotor is pressed along the axial direction to the contact surface of the lower shell, and the sealing effect of the contact surface is ensured.

Description

Technical Field

[0001] This invention relates to the field of valve technology or flow channel switching equipment technology, and particularly to a rotary switching valve. Background Technology

[0002] Hydraulic control valves are essential components in various hydraulic transmission devices. Among directional control valves, hydraulic solenoid directional valves are currently one of the most widely used solenoid valves in industrial control, playing a crucial role in controlling fluid flow direction and pressure. Existing hydraulic solenoid directional valves rely on the linear movement of the valve core to control the opening and closing of corresponding oil circuits, requiring complex shoulder and slot designs on the valve core to meet the hydraulic characteristic requirements of various hydraulic systems. Other structures of this type of hydraulic solenoid directional valve, especially the drive mechanism, are also relatively complex. This results in higher costs, more difficult manufacturing, and more cumbersome assembly. Furthermore, these valves require space to be reserved for valve core movement.

[0003] In the refrigeration systems of new energy vehicles, directional control valves are generally used to switch between cooling and heating functions. Currently, with industrial development, large-scale refrigeration equipment is increasingly being used in the refrigeration industry. This places higher demands on the cooling capacity of directional control valves, requiring larger valve sizes. Existing hydraulic solenoid directional control valves cannot meet the high flow rate requirements, partly due to cost-related factors such as interface size, and primarily due to limited installation space. Therefore, currently, larger rotary directional control valves are often used for switching between cooling and heating functions. However, these rotary directional control valves have poor sealing performance and cannot provide timely leak alarms. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a rotary switching valve in which the rotor is located within the cavity formed by the upper and lower housings, with the lower end face of the rotor fitting against the lower housing. By utilizing the elastic adjustment device, one end of which contacts the pressure groove, the lower end face of the rotor can be axially pressed against the contact surface of the lower housing, thus ensuring a sealing effect on the contact surface.

[0005] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0006] A rotary switching valve includes a housing, a rotor, a drive unit, and elastic adjustment devices. The housing has an internal cavity, and the rotor is located inside the cavity, with one end face of the rotor contacting the cavity wall to form a sealing surface. A pressure groove is provided on the other end face of the rotor. A plurality of elastic adjustment devices are mounted on the housing, with one end of each elastic adjustment device contacting the pressure groove. The elastic adjustment devices provide pre-pressure, causing one end face of the rotor to contact the cavity wall during rotation.

[0007] The rotor's shaft is supported on the housing and connected to the drive unit. The housing has at least two flow channels, and the rotor's end face, which contacts the cavity wall, has at least one connecting channel. By rotating the rotor, the two flow channels can be connected or blocked through the connecting channel. By using the elastic adjustment device to contact the pressure groove at one end, the lower end face of the rotor can be axially pressed against the contact surface of the lower housing, thus ensuring the sealing effect of the contact surface.

[0008] Furthermore, the cavity wall is provided with a concave stop, and a sealing gasket is installed in the concave stop. One end face of the rotor serves as a convex stop, and the convex stop matches the concave stop. The sealing gasket is provided with a through hole corresponding to the flow channel, which facilitates the positioning of the lower end face of the rotor and can also prevent the sealing gasket from being pressed eccentrically when the lower end face of the rotor is squeezed, thus preventing leakage.

[0009] Furthermore, the rotating shaft is connected to the rotor rotating pair, and the rotor is movably mounted on the rotating shaft; the elastic adjustment device provides external force to make the rotor move axially under external force, which is used to press the cover tightly.

[0010] Furthermore, a rotary sealing ring is installed between the rotor circumferential surface and the cavity wall surface. The rotary sealing ring is a Y-shaped sealing ring with the Y-shaped opening facing the sealing surface. By utilizing the leakage liquid pressure, the sealing lip of the Y-shaped opening is pressed and tightly fits against the rotor circumferential surface, effectively preventing liquid from flowing into the upper end of the rotor.

[0011] Furthermore, a leakage cavity is formed between the sealing surface, the rotating sealing ring, the rotor, and the housing; the housing is provided with several side leakage channels, and each side leakage channel corresponds to an elastic adjustment device; one end of each side leakage channel is connected to the leakage cavity, and the other end of each side leakage channel is connected to the piston chamber of the elastic adjustment device; the elastic adjustment device is provided with a movable piston, which uses the fluid in the leakage cavity to flow into the side leakage channel to compress the medium in the side leakage channel, causing the piston in the elastic adjustment device to move downward, thereby pressing the rotor tightly against the sealing surface.

[0012] Furthermore, the elastic adjustment device includes a housing, a piston, a connecting hole, a ball-head push rod, and a spring; the outer side of the housing is threaded for mounting on the housing; the piston, ball-head push rod, and spring are located inside the housing, the piston is axially movable in the piston chamber inside the housing, a spring is provided between one end of the piston and the ball-head push rod, one end of the ball-head push rod extends out of the housing, and the ball head of the ball-head push rod contacts the pressure groove of the rotor; the piston chamber is provided with a connecting hole, and the other end of the side leakage channel communicates with the piston chamber through the connecting hole.

[0013] Furthermore, the piston is a double piston, and the two pistons are connected by a connecting rod; the piston chamber is located in the cavity between the two pistons, and the piston chamber is provided with a connecting hole, and the other end of the side leakage channel is connected to the piston chamber through the connecting hole; an upper limit block is provided inside the outer shell; the connecting rod between the two pistons of the double piston is tapered, so that the pressure-bearing area of ​​the lower piston surface is larger than that of the upper piston surface.

[0014] Furthermore, a liquid detector is installed in the side leakage channel near the connection hole to detect whether liquid has entered the connection hole; the upper part of the ball-head push rod is provided with a protrusion, which passes through the spring. When the spring is compressed, the piston contacts the protrusion to move the ball-head push rod.

[0015] Furthermore, the side leakage channel includes a first side leakage channel and a second side leakage channel. The second side leakage channel is connected to the leakage chamber, and the first side leakage channel is connected to the piston chamber between the two pistons. The cross-sectional area of ​​the second side leakage channel is larger than that of the first side leakage channel, and a valve core is installed in the first side leakage channel.

[0016] Furthermore, the valve core is magnetic, and its position is controlled by an external magnetic field to reset or control the movement of the valve core to apply pressure to the gas in the first side leakage channel.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The rotary switching valve of the present invention has a rotor located in the cavity formed by the upper and lower housings, with the lower end face of the rotor in contact with the lower housing; by using one end of the elastic adjustment device to contact the pressure groove, the lower end face of the rotor can be axially pressed against the contact surface of the lower housing, thus ensuring the sealing effect of the contact surface.

[0019] 2. The rotary switching valve of the present invention has at least two flow channels in the lower housing and at least one connecting channel on the lower end face of the rotor that contacts the lower housing. By rotating the rotor, the two flow channels can be connected through the connecting channel or the two flow channels can be blocked, thus realizing the function of a reversing valve.

[0020] 3. The rotary switching valve of the present invention has a sealing gasket between the contact surface of the lower end face of the rotor and the lower housing. The sealing gasket has a through hole corresponding to the flow channel. The sealing gasket can be pressed by an elastic adjustment device to increase the sealing effect of the sealing gasket.

[0021] 4. The rotary switching valve of the present invention uses a Y-shaped rotary sealing ring installed between the rotor circumferential surface and the upper housing wall surface. The leakage liquid pressure is used to make the sealing lip of the Y port tightly fit against the rotor circumferential surface after being compressed, effectively preventing liquid from flowing into the upper end of the rotor.

[0022] 5. The rotary switching valve of the present invention has a side leakage channel inside the upper housing that communicates with the leakage cavity. The other end of the side leakage channel is connected to an elastic adjustment device. The change in air pressure causes the piston inside the elastic adjustment device to compress the spring, thereby increasing the squeezing force of the rotor's lower end face axially pressing the contact surface of the lower housing.

[0023] 6. The rotary switching valve of the present invention has a sensor on the side leakage channel for detecting whether leakage occurs and confirming the degree of leakage. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the rotary switching valve structure described in this invention.

[0026] Figure 2 This is a front view of the lower housing as described in this invention.

[0027] Figure 3 This is a bottom view of the rotor described in this invention.

[0028] Figure 4 This is a schematic diagram of Embodiment 2 of the rotary switching valve described in this invention.

[0029] Figure 5 This is a schematic diagram of embodiment 3 of the rotary switching valve described in this invention.

[0030] Figure 6 This is a schematic diagram of the elastic adjustment device described in this invention.

[0031] In the picture:

[0032] 1-Servo motor; 2-Rotating shaft; 3-Shaft sleeve; 4-Upper housing; 5-Rotary sealing ring; 6-O-ring; 7-Lower housing; 8-Sealing gasket; 9-Elastic adjustment device; 10-Rotor; 10-1-First sector channel; 10-2-Second sector channel; 11-Side leakage channel; 12-Leakage cavity; 9-1-Outer shell; 9-2-Piston; 9-3-Connecting hole; 9-4-Ball head push rod; 9-5-Spring; 9-6-Upper limit block; 9-7-Protrusion; 11-1-Valve core. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] like Figure 1As shown, the rotary switching valve of the present invention includes an upper housing 4, a lower housing 7, a rotor 10, a rotating shaft 2, and a servo motor 1. One end of the rotating shaft 2 is connected to the servo motor 1, and the other end is connected to the rotor 10. The upper housing 4 and the lower housing 7 are connected by fasteners and sealed between them by an O-ring 6. The rotor 10 is located in the cavity formed by the upper housing 4 and the lower housing 7, and the lower end face of the rotor 10 is in contact with the lower housing 7. A bushing 3 is provided on the upper housing 4, and the rotating shaft 2 is supported in the bushing 3. The servo motor 1 drives the rotor 10 to rotate. A pressure groove is provided on the upper end face of the rotor 10. Several elastic adjustment devices 9 are installed on the upper housing 4, and one end of each elastic adjustment device 9 contacts the pressure groove, which is used to make the lower end face of the rotor 10 press against the contact surface of the lower housing 7 axially. The number of elastic adjustment devices 9 is determined according to the diameter of the rotor 10, and is generally 3-8.

[0038] like Figure 2 and Figure 3 As shown, the lower housing 7 has at least two flow channels, and the lower end face of the rotor 10 that contacts the lower housing 7 has at least one connecting channel. By rotating the rotor 10, the two flow channels can be connected through the connecting channel or the two flow channels can be blocked.

[0039] In Embodiment 1, the lower housing 7 has five flow channels: A, B, C, D, and E. These five channels are evenly distributed within the lower housing 7, meaning the phase angle between each channel is 72°. The lower end face of the rotor 10, which contacts the lower housing 7, has two connecting channels: a first sector-shaped channel 10-1 and a second sector-shaped channel 10-2. Rotation of the rotor 10 connects channels A, B, and C, and channels D and E; reverse rotation of the rotor 10 connects channels D, B, and C, and channels A and E.

[0040] To prevent leakage at the contact surface between the lower end face of the rotor 10 and the lower housing 7, a sealing gasket 8 is provided between the contact surfaces. The sealing gasket 8 has through holes corresponding to the flow channels. The lower housing 7 has a recessed stop, within which the sealing gasket 8 is adhered. The lower end face of the rotor 10 serves as a convex stop, mounted on the recessed stop of the lower housing 7. This facilitates the positioning of the lower end face of the rotor 10 and prevents the sealing gasket 8 from being pressed eccentrically, thus preventing leakage, when the lower end face of the rotor 10 presses against the sealing gasket 8 later.

[0041] like Figure 1 As shown, a rotary sealing ring 5 is installed between the circumferential surface of the rotor 10 and the wall surface of the upper housing 4 to prevent leaked liquid from flowing into the upper end of the rotor 10. The rotary sealing ring 5 is a Y-shaped sealing ring, with the Y-shaped opening facing the leakage surface, as shown. Figure 1As shown. This allows the leakage liquid pressure to compress the sealing lip of the Y port, causing it to fit tightly against the circumferential surface of the rotor 10, effectively preventing liquid from flowing into the upper end of the rotor 10.

[0042] like Figure 4 and Figure 6 As shown in Embodiment 2, the other end of the rotating shaft 2 is connected to the rotor 10 via a sliding key, allowing the rotor 10 to move axially along the sliding key under external force. The elastic adjustment device 9 can provide the external force to the rotor 10. Figure 1 and Figure 4 As shown, a leakage cavity 12 is formed between the rotary sealing ring 5, the rotor 10, the lower housing 7, and the upper housing 4. The upper housing 4 has a side leakage channel 11, and each side leakage channel 11 corresponds to an elastic adjustment device 9. The following uses a set of corresponding side leakage channels 11 and elastic adjustment devices 9 to illustrate this in detail: one side of each side leakage channel 11 connects to the leakage cavity 12; for example... Figure 6 As shown, the elastic adjustment device 9 includes a housing 9-1, a piston 9-2, a connecting hole 9-3, a ball-head push rod 9-4, and a spring 9-5. The housing 9-1 has threads on its outer side for mounting on the upper housing 4. The piston 9-2, ball-head push rod 9-4, and spring 9-5 are located inside the housing 9-1. The piston 9-2 is axially movable within the housing 9-1. A spring 9-5 is positioned between one end of the piston 9-2 and the ball-head push rod 9-4. One end of the ball-head push rod 9-4 extends out of the housing 9-1, and the ball head of the ball-head push rod 9-4 contacts a pressure groove on the upper surface of the rotor 10. Changes in the compression of the spring 9-5 alter the distance the ball-head push rod 9-4 extends out of the housing 9-1. Generally, the ball-head push rod 9-4 has a limiting step to prevent it from falling out of the housing 9-1 during installation. Alternatively, the push rod portion of the ball-head push rod 9-4 can be tapered, and the bottom of the housing 9-1 can be a tapered hole.

[0043] like Figure 6As shown, piston 9-2 is a double piston, connected by a connecting rod. The fit between piston 9-2 and housing 9-1 is similar to that of a cylinder and piston; a sealing ring needs to be installed on piston 9-2 if necessary. The other side of the side leakage channel 11 connects to the cavity between the two pistons; housing 9-1 has a connecting hole 9-3, which connects directly to the cavity between the two pistons. To facilitate machining of the connecting hole 9-3, an upper limit block 9-6 is provided inside housing 9-1 to limit the upward movement of piston 9-2. This can also be considered as the initial preload applied by piston 9-2 to ball head push rod 9-4 via spring 9-5. When assembling the elastic adjustment device 9, ball head push rod 9-4, spring 9-5, and piston 9-2 are placed inside housing 9-1 in sequence, and upper limit block 9-6 is installed inside housing 9-1, positioning piston 9-2 at upper limit block 9-6. This allows the elastic adjustment device 9 to be installed entirely inside the housing 4, so that the ball head of the ball push rod 9-4 contacts the pressure groove on the upper end face of the rotor 10, thus providing a pre-clamping force to the rotor 10. Simultaneously, the upper limit block 9-6 ensures that the cavity between the connecting hole 9-3 and the two pistons remains open.

[0044] The working principle of Example 2 is as follows: When leakage occurs in leakage chamber 12, liquid enters the side leakage channel 11 from leakage chamber 12 and compresses the gas in the side leakage channel 11. When the gas is compressed to a certain pressure, the gas pressure drives piston 9-2 to move downward through connection hole 9-3. Compression spring 9-5 causes ball head push rod 9-4 to apply a large axial force. Since rotor 10 can move axially along sliding key under external force, and ball head push rod 9-4 applies a large axial force, causing rotor 10 to move axially, it can further press the sealing gasket 8 of the contact surface between the lower end face of rotor 10 and lower housing 7, thus preventing leakage. Figure 5 The piston 9-2 is shown in the diagram. A liquid detector is installed in the side leakage channel 11 near the connection hole 9-3 to detect whether liquid has entered the side leakage channel 11 and the connection hole 9-3. The connecting rod between the two pistons of the double piston is tapered, which makes the pressure-bearing area of ​​the lower piston surface larger than that of the upper piston surface, thus ensuring that the double piston moves downward.

[0045] Example 2 carries the risk of liquid spraying from the side leakage channel 11 through the connection hole 9-3 and exiting the upper part of the outer casing 9-1. This is because when the pressure is high enough that both pistons exceed the connection hole 9-3, the compressed gas in the side leakage channel 11 becomes connected to the outside atmosphere, causing rapid depressurization. Although piston 9-2 moves upwards during this depressurization, reconnecting the connection hole 9-3 to the cavity within the two pistons, repeated cycles cannot guarantee that liquid will not spray from the upper part of the outer casing 9-1 after the gas in the side leakage channel 11 is completely exhausted. Therefore, Example 3, based on Example 2, includes a valve core 11-1 within the side leakage channel 11. The valve core 11-1 divides the side leakage channel 11 into a first side leakage channel and a second side leakage channel. The second side leakage channel communicates with the leakage chamber 12, while the first side leakage channel communicates with the cavity between the two pistons. The cross-sectional area of ​​the second side leakage channel is larger than that of the first side leakage channel. Liquid entering the second side leakage channel pushes the valve core to compress the gas in the first side leakage channel. Figure 5 As shown. The valve core is magnetic, and its position can be manually controlled by an external magnetic field. It can be used for resetting or for manually controlling the pressure applied to the gas in the first side leakage channel. Furthermore, because the valve core is magnetic, its position can be determined by a magnetic field sensor to decide whether an alarm is needed.

[0046] like Figure 6 As shown, the ball-end push rod 9-4 has a protrusion 9-7 on its upper part. The protrusion 9-7 passes through the spring 9-5. When the spring 9-5 is compressed, the piston 9-2 contacts the protrusion 9-7, which can move the ball-end push rod 9-4. It should be noted that the ball-end push rod 9-4 can move only after the piston 9-2 contacts the protrusion 9-7. Alternatively, the piston 9-2 can compress the spring 9-5, and the compressed spring 9-5 can move the ball-end push rod 9-4.

[0047] In the refrigeration system of new energy vehicles, the rotary reversing valve described in this invention is installed to switch between cooling and heating functions. Since the pump used for cooling / heating fluids in the automotive field operates at a pressure of 100 kPa, the pressure of the leaking liquid may decrease, resulting in lower pressure of the gas in the compression side leakage channel 11. Therefore, it can be connected to an external pneumatic system when necessary. Specifically, the valve core 11-1 in the second side leakage channel moves to a set position, triggering the external pneumatic system to connect with the first side leakage channel, thus moving the piston. The valve core 11-1 triggers the connection between the external pneumatic system and the first side leakage channel via a sensor. Specifically, a contact sensor is installed in the second side leakage channel to determine the position of the valve core 11-1. When the valve core triggers the contact sensor, a locking mechanism locks the valve core 11-1, and the controller controls the valve to connect the external pneumatic system with the first side leakage channel. The locking mechanism prevents the valve core 11-1 from moving backward. Alternatively, the pneumatic system and the first side leakage channel may be equipped with a wedge-shaped mechanical gate, which is opened by the valve core 11-1.

[0048] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotary switching valve, characterized in that, The device includes a housing, a rotor (10), a drive unit, and an elastic adjustment device (9). The housing has an internal cavity, and the rotor (10) is located inside the cavity. One end face of the rotor (10) contacts the cavity wall to form a sealing surface. The other end face of the rotor (10) has a pressure groove. Several elastic adjustment devices (9) are installed on the housing, and one end of each elastic adjustment device (9) contacts the pressure groove. The elastic adjustment device (9) provides pre-pressure so that one end face of the rotor (10) contacts the cavity wall during rotation. The rotor (10) has a shaft (2) supported on the housing and the shaft (2) is connected to the drive unit. The housing has at least two flow channels and the rotor (10) has at least one connecting channel on one end face that is in contact with the cavity wall. By rotating the rotor (10), the two flow channels can be connected or blocked through the connecting channel. A rotary sealing ring (5) is installed between the circumferential surface of the rotor (10) and the cavity wall. The rotary sealing ring (5) is a Y-shaped sealing ring with the Y-shaped opening facing the sealing surface. A leakage cavity (12) is formed between the sealing surface, the rotary sealing ring (5), the rotor (10), and the housing. The housing is provided with several side leakage channels (11), and each side leakage channel (11) corresponds to an elastic adjustment device (9). One end of the side leakage channel (11) is connected to the leakage cavity (12), and the other end of the side leakage channel (11) is connected to the piston cavity of the elastic adjustment device (9). The elastic adjustment device (9) is provided with a movable piston (9-2). The fluid in the leakage cavity (12) flows into the side leakage channel (11) to compress the medium in the side leakage channel (11), causing the piston (9-2) in the elastic adjustment device (9) to move downward, so as to press the rotor (10) tightly against the cover. The elastic adjustment device (9) includes a housing (9-1), a piston (9-2), a connecting hole (9-3), a ball-head push rod (9-4), and a spring (9-5); the outer side of the housing (9-1) is provided with threads for mounting on the housing (4); the piston (9-2), the ball-head push rod (9-4), and the spring (9-5) are located inside the housing (9-1); the piston (9-2) is axially movable and installed in the piston chamber inside the housing (9-1); a spring (9-5) is provided between one end of the piston (9-2) and the ball-head push rod (9-4); one end of the ball-head push rod (9-4) extends out of the housing (9-1); the ball head of the ball-head push rod (9-4) contacts the pressure groove of the rotor (10); the piston chamber is provided with a connecting hole (9-3); the other end of the side leakage channel (11) is connected to the piston chamber through the connecting hole (9-3); The piston (9-2) is a double piston, and the two pistons are connected by a connecting rod; the piston chamber is located in the cavity between the two pistons, and the piston chamber is provided with a connecting hole (9-3). The other end of the side leakage channel (11) is connected to the piston chamber through the connecting hole (9-3); an upper limit block (9-6) is provided in the outer shell (9-1); the connecting rod between the two pistons of the double piston is conical, so that the pressure area of ​​the lower piston surface is greater than that of the upper piston surface.

2. The rotary switching valve according to claim 1, characterized in that, The cavity wall is provided with a concave stop, and a sealing gasket (8) is installed in the concave stop. One end face of the rotor (10) serves as a convex stop, and the convex stop and the concave stop are matched and installed. The sealing gasket (8) is provided with a through hole corresponding to the flow channel.

3. The rotary switching valve according to claim 1, characterized in that, The rotating shaft (2) is connected to the rotor (10) rotating pair, and the rotor (10) is movably mounted on the rotating shaft (2); the elastic adjustment device (9) provides external force to make the rotor (10) move axially under external force, which is used to press the cover tightly.

4. The rotary switching valve according to claim 1, characterized in that, A liquid detector is installed in the side leakage channel (11) near the connection hole (9-3) to detect whether liquid enters the connection hole (9-3); the upper part of the ball head push rod (9-4) is provided with a protrusion (9-7), the protrusion (9-7) passes through the spring (9-5), and when the spring (9-5) is compressed, the piston (9-2) contacts the protrusion (9-7) to move the ball head push rod (9-4).

5. The rotary switching valve according to claim 1, characterized in that, The side leakage channel (11) includes a first side leakage channel and a second side leakage channel. The second side leakage channel is connected to the leakage chamber (12). The first side leakage channel is connected to the piston chamber between the two pistons. The cross-sectional area of ​​the second side leakage channel is larger than that of the first side leakage channel. A valve core (11-1) is installed in the first side leakage channel. The valve core is magnetic and its position is controlled by an external magnetic field. It is used to reset or control the movement of the valve core to apply pressure to the gas in the first side leakage channel.

6. The rotary switching valve according to claim 1, characterized in that, It also includes an external air pressure system, which is triggered to connect with the first side leakage channel by moving the valve core in the second side leakage channel to a set position.

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