Rotary four-way reversing valve

Abstract

The rotary four-way reversing valve comprises a valve body, a valve cover and a valve element, four oil inlets and outlets communicated with the outside are formed in the valve body, four matched oil ports are formed in the inner wall face of a valve cavity at intervals, and a first through-flow cavity and a second through-flow cavity are formed in the outer surface of the valve element; 12 switching oil ports are formed in the outer surface of the valve element at intervals, and each switching oil port is only communicated with one of the first through-flow cavity and the second through-flow cavity; 15 working positions distributed along 360 degrees are formed, and under the condition that the valve element rotates by one circle, each oil inlet and outlet can be correspondingly communicated with each switching oil port only through the corresponding matching oil port and the corresponding switching oil port for one time in sequence. The device has the advantages of multiple position functions, simple structure, easiness in processing and simplicity and convenience in use.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid reversing valves, and particularly to a rotary four-way reversing valve. Background Art

[0002] A reversing valve is used to control the flow direction of fluid in a working system, as well as the flow-through and cut-off of fluid, etc. It is an important type of control valve in fluid transmission and control systems. In particular, a four-way reversing valve is indispensable in fluid transmission and control systems.

[0003] The utility model patent with the patent number 201711082911.3 and the patent name "Integrated Electric Four-Way Reversing Valve" discloses an integrated electric four-way reversing valve, which includes a motor, a transmission device, a valve body, a first rotary valve core and a second rotary valve core. The motor drives the first rotary valve core and the second rotary valve core to rotate synchronously through the transmission device; the valve body is provided with a first flow channel, a second flow channel, a third flow channel and a fourth flow channel. The first flow channel is provided with a first through hole, the second flow channel is provided with a second through hole, the third flow channel is provided with a third through hole, and the fourth flow channel is provided with a fourth through hole; the first rotary valve core can rotate back and forth between a first position blocking the first through hole and a third position blocking the third through hole, and the second rotary valve core can rotate back and forth between a second position blocking the second through hole and a fourth position blocking the fourth through hole. This integrated electric four-way reversing valve has high integration, simple assembly and few leakage points. Like the existing conventional four-way reversing valves, this patent has fewer position functions. A single four-way valve can only achieve a few determined logical on-off relationships among four oil ports. If more position functions are to be achieved, it can only be realized through complex structures and oil passage designs, resulting in complex structures, troublesome manufacturing and high costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a rotary four-way reversing valve, which has the advantages of multiple position functions, simple structure, easy processing and convenient use.

[0005] The present invention adopts the following technical solutions:

[0006] A rotary four-way reversing valve includes a valve body, a valve cover and a valve core. The valve core is rotatably arranged in the valve cavity of the valve body. The valve body is provided with first to fourth oil inlets and outlets communicating with the outside. The inner wall surface of the valve cavity is respectively provided with first to fourth mating oil ports at intervals. The first to fourth oil inlets and outlets are respectively communicated with the valve cavity through the corresponding first to fourth mating oil ports; the valve core is provided with a first annular groove and a second annular groove at intervals in the circumferential direction up and down. The first annular groove and the second annular groove correspondingly form independent first and second flow-through cavities; 12 switching oil ports are also arranged at intervals on the outer surface of the valve core in the circumferential direction. Each switching oil port is only communicated with one of the first flow-through cavity and the second flow-through cavity.

[0007] The spool forms 15 working positions distributed along 360° through the first annular groove, the second annular groove and 12 switching oil ports arranged at intervals, in cooperation with the first to fourth oil inlet / outlet ports and the first to fourth mating oil ports provided on the valve body. By rotating the spool to different working positions, the alignment and connection between different switching oil ports and mating oil ports are switched, realizing different position functions between the first to fourth oil inlet / outlet ports; when the spool rotates one week, each oil inlet / outlet port can only be correspondingly connected to each switching oil port through the corresponding mating oil port once and only once in sequence.

[0008] The present invention constructs a flow path through the oil inlet / outlet ports, mating oil ports, annular grooves and switching oil ports. By using 15 working positions distributed along a 360° circumference and the special design that when the spool rotates one week, each oil inlet / outlet port can only be correspondingly connected to each switching oil groove through the corresponding mating oil port once and only once in sequence, as the spool rotates to different working positions, the alignment and connection between different switching oil grooves and mating oil ports are switched, realizing different logical on / off relationships between the first oil inlet / outlet port and the fourth oil inlet / outlet port.

[0009] Preferably, the circumferential interval angle between two adjacent working positions is θ, and the circumferential interval angle between two adjacent switching oil ports is an integer multiple of T*θ, where T is a positive integer.

[0010] Preferably, the circumferential interval angle between two adjacent working positions is 24°. With the rotation axis of the spool as the center, the first to fourth mating oil ports are successively located at the positions of 0°, 72°, 192° and 288°; along the same circumferential indexing direction, the 12 switching oil ports are successively located at the positions of 0°, 24°, 48°, 72°, 96°, 120°, 144°, 168°, 192°, 240°, 264° and 312°; among them, 8 switching oil ports located at the positions of 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° are respectively connected to the first flow chamber, and 4 switching oil ports located at the positions of 0°, 72°, 120° and 168° are respectively connected to the second flow chamber.

[0011] In order to ensure that the first annular groove and the second annular groove can be smoothly and uniquely connected to each mating oil port once, the first annular groove and the second annular groove are covered by the inner wall surface of the valve cavity, correspondingly forming independent first and second flow cavities; the first annular groove is higher than the first to fourth mating oil ports, and the second annular groove is lower than the first to fourth mating oil ports. The first and second flow cavities are not directly connected to the first to fourth mating oil ports; all 12 switching oil ports are located between the first annular groove and the second annular groove, and one end of each switching oil port is open; the open ends of 8 switching oil ports located at 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° positions are upward and communicate with the first annular groove, and the other end of the switching oil port is closed, and the lower edge of the closed end is not higher than the lower edge of the first to fourth mating oil ports; the open ends of 4 switching oil ports located at 0°, 72°, 120° and 168° positions are downward and communicate with the second annular groove, and the other end of the switching oil port is closed, and the upper edge of the closed end is not lower than the upper edge of the first to fourth mating oil ports.

[0012] Preferably, the valve core is composed of a core shaft, a ring sleeve and a coupling key. The ring sleeve is sleeved outside the core shaft and forms a circumferential driving connection with the core shaft through the coupling key. The first annular groove and the second annular groove are arranged on the outer peripheral wall surface of the core shaft. The first annular groove and the second annular groove are both sealed and covered by the inner wall surface of the ring sleeve and correspondingly form the first and second flow cavities; 12 switching oil ports are arranged on the ring sleeve at circumferential intervals, and each switching oil port communicates with only one of the first and second flow cavities.

[0013] The core shaft, through the first annular groove, the second annular groove and 12 switching oil ports, in cooperation with the first to fourth oil inlets and outlets provided on the valve body, and the first to fourth mating oil ports, forms 15 working positions distributed along 360°. By rotating the core shaft to different working positions, different switching oil ports are switched to be aligned and connected with the mating oil ports, so as to realize different position functions between the first to fourth oil inlets and outlets; when the core shaft rotates one week, each oil inlet and outlet can only be uniquely connected to each switching oil port through the corresponding mating oil port in sequence.

[0014] Preferably, the first to fourth oil inlets / outlets are arranged on the side wall of the valve body; among the first to fourth mating oil ports, each mating oil port includes two independent upper oil ports and lower oil ports; the first to fourth mating upper oil ports are arranged at the same layer height on the upper part of the inner wall surface of the valve cavity; the first to fourth mating lower oil ports are arranged at the same layer height on the lower part of the inner wall surface of the valve cavity; and each of the mating oil ports is not directly communicated with each other; the first mating upper oil port and the first mating lower oil port are vertically aligned and both are communicated with the first oil inlet / outlet; the second mating upper oil port and the second mating lower oil port are vertically aligned and both are communicated with the second oil inlet / outlet; the third mating upper oil port and the third mating lower oil port are vertically aligned and both are communicated with the third oil inlet / outlet; the fourth mating upper oil port and the fourth mating lower oil port are vertically aligned and both are communicated with the fourth oil inlet / outlet.

[0015] Preferably, with the rotation axis of the valve core as the center, the inner wall surface of the valve cavity is circumferentially divided. Along the circumferential winding direction from the first mating upper oil port to the second mating upper oil port, the first mating upper oil port and the first mating lower oil port are located at the 0° position, the second mating upper oil port and the second mating lower oil port are located at the 72° position, the third mating upper oil port and the third mating lower oil port are located at the 192° position, and the fourth mating upper oil port and the fourth mating lower oil port are located at the 288° position; the height position where the first ring groove is located is the same as the height where the first to fourth mating upper oil ports are located; the height position where the second ring groove is located is the same as the height where the first to fourth mating lower oil ports are located; corresponding to the height where the first to fourth mating upper oil ports are located, 8 switching oil ports are circumferentially arranged on the outer peripheral wall surface of the ring sleeve, and the 8 switching oil ports respectively penetrate the ring sleeve wall in the radial direction and are communicated with the first flow-through cavity; corresponding to the height where the first to fourth mating lower oil ports are located, 4 switching oil ports are circumferentially arranged on the outer peripheral wall surface of the ring sleeve, and the 4 switching oil ports respectively penetrate the ring sleeve wall in the radial direction and are communicated with the second flow-through cavity; with the rotation axis of the valve core as the center, the outer peripheral wall surface of the ring sleeve is divided. Along the circumferential winding direction from the first mating upper oil port to the second mating upper oil port, a total of 8 switching oil ports from the fifth to the twelfth are sequentially distributed at the 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° positions, and a total of 4 switching oil ports from the first to the fourth are sequentially distributed at the 0°, 72°, 120° and 168° positions.

[0016] Preferably, the first to fourth mating oil ports are arranged on the inner bottom surface of the valve cavity, and the first to fourth oil inlets / outlets are arranged on the bottom surface of the valve body; with the rotation axis of the ring sleeve as the center, along the circumferential winding direction from the first mating oil port to the second mating oil port, the first to fourth mating oil ports are sequentially located at the 0°, 72°, 192° and 288° positions.

[0017] Preferably, the 12 switching oil ports are arranged on the lower end surface of the annular sleeve and are located on the same circumference as the first to fourth mating oil ports; along the circumferential direction of the circle from the first mating oil port to the second mating oil port, the first to fourth switching oil ports are respectively located at positions of 0°, 72°, 120° and 168°, and the fifth to twelfth switching oil ports are respectively located at positions of 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312°; 12 independent oil channels corresponding to each switching oil port are respectively arranged on the annular sleeve, and the fifth to twelfth switching oil ports are respectively communicated with the first flow chamber through their respective corresponding independent oil channels, and the first to fourth switching oil ports are respectively communicated with the second flow chamber through their respective independent oil channels.

[0018] Preferably, the inner wall of the annular sleeve is provided with two levels of steps, the first and the second, from top to bottom, and the outer periphery of the core shaft forms a stepped shape with a gradually decreasing diameter from top to bottom. The first step is located in the area of the first flow chamber, and the second step is located in the area of the second flow chamber. The oil in the first flow chamber and the second flow chamber respectively generates a downward thrust through the first step surface and the second step surface, pressing the annular sleeve tightly against the bottom surface of the valve cavity, so as to achieve a better sealing effect between the bottom surface of the annular sleeve and the bottom surface of the valve cavity.

[0019] For the rotary four-way reversing valve of the present invention, a flow path is constructed through the oil inlet and outlet, mating oil ports, annular grooves and switching oil ports. By using 15 working positions distributed along the 360° circumference, a mechanism is specially designed such that when the valve core rotates one week, each oil inlet and outlet can only be uniquely connected to each switching oil groove through the corresponding mating oil port in sequence. As the valve core rotates to different working positions, different switching oil ports are switched to be aligned and communicated with the mating oil ports, realizing different position functions between the first to fourth oil inlets and outlets. The rotary four-way reversing valve of the present invention can achieve more position functions, can realize more reversing logic relationships with a single four-way valve, and at the same time has the advantages of simple structure and easy processing. Description of the Drawings

[0020] Figure 1 It is the A-A sectional view of Embodiment 1 of the present invention; the section position is as Figure 2 shown, and the valve core is in the initial working position;

[0021] Figure 2 It is the B-B sectional view of Embodiment 1 of the present invention, and the valve core is in the initial working position;

[0022] Figure 3 It is the front view of the valve core of Embodiment 1 of the present invention;

[0023] Figure 4 It is the C-C sectional view of the valve core of Embodiment 1 of the present invention;

[0024] Figure 5Cross-sectional view D-D of the spool for Embodiment 1 of the present invention;

[0025] Figure 6 Cross-sectional view E-E of the spool for Embodiment 1 of the present invention;

[0026] Figure 7 Schematic diagram of the connection relationship between the 12 switching oil ports and the first flow passage chamber and the second flow passage chamber for Embodiment 1 of the present invention;

[0027] Figure 8 Schematic diagram of all position functions and corresponding connection relationships for Embodiment 1 of the present invention;

[0028] Figure 9 A-A cross-sectional view of Embodiment 2 of the present invention; the cutting position is as Figure 10 shown, and the spool is in the initial working position;

[0029] Figure 10 B-B cross-sectional view of Embodiment 2 of the present invention, with the spool in the initial working position;

[0030] Figure 11 C-C cross-sectional view of Embodiment 2 of the present invention, with the spool in the initial working position;

[0031] Figure 12 Axial projection schematic diagram of the circumferential positions of all switching oil ports in Embodiment 2 of the present invention;

[0032] Figure 13 Schematic diagram of the relative distribution of all switching oil ports and their connection relationships with the two flow passage chambers in Embodiment 2 of the present invention;

[0033] Figure 14 A-A cross-sectional view of Embodiment 3 of the present invention, with the spool in the initial working position;

[0034] Figure 15 B-B cross-sectional view of Embodiment 3 of the present invention, with the spool in the initial working position;

[0035] Figure 16 C-C cross-sectional view of Embodiment 3 of the present invention, with the spool in the initial working position;

[0036] Figure 17 D-D cross-sectional view of Embodiment 3 of the present invention, with the spool in the initial working position;

[0037] Figure 18 E-E cross-sectional view of Embodiment 3 of the present invention, with the spool in the initial working position;

[0038] Figure 19 Schematic diagram of the connection relationship between the 12 switching oil ports and the first flow passage chamber and the second flow passage chamber for Embodiment 3 of the present invention. Detailed implementation manners

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments:

[0040] As Figures 1 to 19 shown, the rotary four-way reversing valve of the present invention includes a valve body 1, a valve cover 2 and a valve core 3. The valve core 3 is rotatably arranged in the valve cavity of the valve body 1. The valve body 1 is provided with a first oil inlet / outlet P1 to a fourth oil inlet / outlet P4 that communicate with the outside. The inner wall surface of the valve cavity is respectively provided with a first mating oil port 11 to a fourth mating oil port 14 at intervals. The first oil inlet / outlet P1 to the fourth oil inlet / outlet P4 are respectively communicated with the valve cavity through the corresponding first mating oil port 11 to the fourth mating oil port 14; The valve core 3 is provided with a first annular groove 3a1 and a second annular groove 3a2 at intervals in the circumferential direction and in the vertical direction. The first annular groove 3a1 and the second annular groove 3a2 correspondingly form independent first flow passages 4 and second flow passages 5; On the outer surface of the valve core 3, 12 switching oil ports are also arranged at intervals in the circumferential direction. Each switching oil port communicates with only one of the first flow passage 4 and the second flow passage 5.

[0041] The valve core 3, through the first annular groove 3a1, the second annular groove 3a2 and the 12 switching oil ports arranged at intervals, cooperates with the first oil inlet / outlet P1 to the fourth oil inlet / outlet P4 arranged on the valve body 1, and the first mating oil port 11 to the fourth mating oil port 14, to form 15 working positions distributed in a 360° circumference. By rotating the valve core 3 to different working positions, different switching oil ports are switched to be aligned and communicated with the mating oil ports, so as to realize different position functions between the first oil inlet / outlet P1 to the fourth oil inlet / outlet P4; When the valve core rotates one week, each oil inlet / outlet can only be correspondingly connected to each switching oil port through the corresponding mating oil port once and only once.

[0042] In the present invention, the rotary four-way reversing valve has the following 15 different position functions:

[0043] (1) Full communication between P1, P2, P3 and P4;

[0044] (2) Communication between P1 and P2, disconnection between P3 and P4, and both P1 and P2 are disconnected from P3 and P4;

[0045] (3) Communication between P1 and P3, disconnection between P2 and P4, and both P1 and P3 are disconnected from P2 and P4;

[0046] (4) Communication between P1 and P4, disconnection between P2 and P3, and both P1 and P4 are disconnected from P2 and P3;

[0047] (5) Communication between P2 and P3, disconnection between P1 and P4, and both P2 and P3 are disconnected from P1 and P4;

[0048] (6) P2 and P4 are connected, P1 and P3 are disconnected, and P2 and P4 are disconnected from P1 and P3;

[0049] (7) P3 and P4 are connected, P1 and P2 are disconnected, and P3 and P4 are disconnected from P1 and P2;

[0050] (8) P1, P2 and P3 are connected, and P1, P2 and P3 are disconnected from P4;

[0051] (9) P1, P2 and P4 are connected, and P1, P2 and P4 are disconnected from P3;

[0052] (10) P1, P3 and P4 are connected, and P1, P3 and P4 are disconnected from P2;

[0053] (11) P2, P3 and P4 are connected, and P2, P3 and P4 are disconnected from P1;

[0054] (12) P1 and P2 are connected, P3 and P4 are connected, and P1 and P2 are disconnected from P3 and P4;

[0055] (13) P1 and P3 are connected, P2 and P4 are connected, and P1 and P3 are disconnected from P2 and P4;

[0056] (14) P1 and P4 are connected, P2 and P3 are connected, and P1 and P4 are disconnected from P2 and P3.

[0057] (15) P1, P2, P3 and P4 are all disconnected from each other.

[0058] In the present invention, the circumferential spacing angle between two adjacent working positions is θ, and the circumferential spacing angle between two adjacent switching oil ports is an integer multiple of T*θ, where T is a positive integer.

[0059] In the present invention, 15 working positions can be further set to be evenly distributed along a 360° circumference, that is, the circumferential interval angle θ between two adjacent working positions is 24°, and with the rotation axis of the valve core as the center of the circle, the first to fourth matching oil ports are located at: 0°, 72°, 192° and 288° positions respectively; the valve core is indexed along the same circumferential indexing direction, and the 12 switching oil ports are located at: 0°, 24°, 48°, 72°, 96°, 120°, 144°, 168°, 192°, 240°, 264° and 312° positions respectively; among them, the 8 switching oil ports located at 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° positions are respectively connected to the first flow chamber, and the 4 switching oil ports located at 0°, 72°, 120° and 168° positions are respectively connected to the second flow chamber.

[0060] The rotary four-way reversing valve in the present invention will be further described in combination with different embodiments as follows:

[0061] Embodiment 1:

[0062] In Embodiment 1, the rotary four-way reversing valve includes a valve body 1, a valve cover 2, and a valve core 3. A valve cavity is provided inside the valve body 1, and the valve core 3 is installed in the valve cavity. The inner wall surface of the valve cavity is in liquid-tight fit with the outer peripheral wall surface of the valve core, and the valve core 3 rotates in the valve cavity. Combining Figure 1 and Figure 2 , the side wall of the valve body 1 is provided with a first oil inlet / outlet P1 to a fourth oil inlet / outlet P4 that communicate with the outside. The inner wall surface of the valve cavity is respectively provided with a first mating oil port 11 to a fourth mating oil port 14 at intervals. The first mating oil port 11 to the fourth mating oil port 14 are at the same height. With the rotation axis of the valve core 3 as the center, the first mating oil port 11 to the fourth mating oil port 14 are sequentially located on the inner wall surface of the valve cavity at positions of 0°, 72°, 192°, and 288°; the first oil inlet / outlet P1 to the fourth oil inlet / outlet P4 are respectively communicated with the valve cavity through the corresponding first mating oil port 11 to the fourth mating oil port 14.

[0063] Referring to Figure 1 and Figure 3 , in this embodiment, the valve core 3 adopts an integral valve core; the outer peripheral wall of the valve core 3 is provided with a first annular groove 3a1 and a second annular groove 3a2 at intervals in the circumferential and vertical directions. The first annular groove 3a1 and the second annular groove 3a2 are covered by the inner wall surface of the valve cavity, corresponding to form independent first flow chambers 4 and second flow chambers 5; the first annular groove 3a1 is higher than the first mating oil port 11 to the fourth mating oil port 14, and the second annular groove 3a2 is lower than the first mating oil port 11 to the fourth mating oil port 14. The first flow chambers 4 and the second flow chambers 5 cannot be directly communicated with the first mating oil port 11 to the fourth mating oil port 14.

[0064] Referring to Figures 3 to 6 , the outer peripheral wall surface of the valve core 3 is circumferentially provided with 12 switching oil ports with one end open, and the 12 switching oil ports are all located between the first annular groove 3a1 and the second annular groove 3a2. When the outer peripheral wall surface of the valve core 3 is divided along the circumferential direction from the first mating oil port 11 to the second mating oil port 12, the 12 switching oil ports are sequentially located at positions of 0°, 24°, 48°, 72°, 96°, 120°, 144°, 168°, 192°, 240°, 264°, and 312°.

[0065] Among them, the open ends of eight switching oil ports located at 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° respectively face upward and are communicated with the first annular groove 3a1, and the other ends of the switching oil ports are closed. The lower edge of the closed end is not higher than the lower edges of the first mating oil port 11 to the fourth mating oil port 14, that is, lower than or flush with each other; the above eight switching oil ports are defined as s1 to s8 respectively.

[0066] The open ends of four switching oil ports located at 0°, 72°, 120° and 168° respectively face downward and are communicated with the second annular groove 3a2, and the other ends of the switching oil ports are closed. The upper edge of the closed end is not lower than the upper edges of the first mating oil port 11 to the fourth mating oil port 14, that is, higher than or flush with each other. The above four switching oil ports are defined as x1 to x4 respectively.

[0067] Figure 7 It is a schematic diagram of the circumferential distribution of twelve switching oil ports and their connection relationships with the first flow-through cavity 4 and the second flow-through cavity 5 respectively.

[0068] By rotating the valve core 3, the first mating oil port 11 to the fourth mating oil port 14 can be respectively connected or disconnected from the twelve switching oil ports, so that the first mating oil port 11 to the fourth mating oil port 14 can be connected or disconnected through the first flow-through cavity 4 or the second flow-through cavity 5, and finally the first oil inlet / outlet P1 to the fourth oil inlet / outlet P4 can be connected or disconnected, thereby forming different position functions. During the process of the valve core 3 rotating one week, each oil inlet / outlet can only be uniquely connected to each switching oil port through the corresponding mating oil port in sequence, forming fifteen working positions evenly distributed along the 360° circumference, and realizing fifteen position functions. The circumferential interval angle between adjacent working positions is 24°.

[0069] Combined Figure 7 and Figure 8 , rotate the valve core in sequence along the rotation direction from the first mating oil port 11 to the second mating oil port 12, and the specific logic on-off relationships of the fifteen position functions are as follows:

[0070] When the valve core is in the initial working position 0:

[0071] The mating oil port 11 is aligned with the switching oil port x1, the mating oil port 12 is aligned with the switching oil port x2, the mating oil port 13 is aligned with the switching oil port s5, and the mating oil port 14 is not aligned with any switching oil port and is cut off; at this time, the second flow-through cavity 5 connects the oil inlet / outlets P1 and P2, the oil inlet / outlets P3 and P4 are disconnected, and both P1 and P2 are disconnected from P3 and P4; corresponding to the position function (2) in the above text;

[0072] When the valve core rotates 24° to the working position 1:

[0073] The mating oil port 11 is not aligned with any switching oil port and is blocked. The mating oil port 12 is aligned with the switching oil port s2, the mating oil port 13 is aligned with the switching oil port x4, and the mating oil port 14 is aligned with the switching oil port s7. At this time, the first flow-through cavity 4 connects the oil inlet / outlet ports P2 and P4, the oil inlet / outlet ports P1 and P3 are disconnected, and both P2 and P4 are disconnected from P1 and P3, corresponding to the position function (6) in the above text.

[0074] When the spool rotates 48° to the working position 2:

[0075] The mating oil port 11 is aligned with the switching oil port s8, the mating oil port 12 is aligned with the switching oil port s1, the mating oil port 13 is aligned with the switching oil port s4, and the mating oil port 14 is aligned with the switching oil port s6. At this time, the first flow-through cavity 4 connects all the oil inlet / outlet ports P1, P2, P3, and P4, corresponding to the position function (1) in the above text.

[0076] When the spool rotates 72° to the working position 3:

[0077] The mating oil port 11 is not aligned with any switching oil port and is blocked. The mating oil port 12 is aligned with the switching oil port x1, the mating oil port 13 is aligned with the switching oil port x3, and the mating oil port 14 is not aligned with any switching oil port and is blocked. At this time, the second flow-through cavity 5 connects the oil inlet / outlet ports P2 and P3, the oil inlet / outlet ports P1 and P4 are disconnected, and both P2 and P3 are disconnected from P1 and P4, corresponding to the position function (5) in the above text.

[0078] When the spool rotates 96° to the working position 4:

[0079] The mating oil port 11 is aligned with the switching oil port s7, the mating oil port 12 is not aligned with any switching oil port and is blocked, the mating oil port 13 is aligned with the switching oil port s3, and the mating oil port 14 is aligned with the switching oil port s5. At this time, the first flow-through cavity 4 connects the oil inlet / outlet ports P1, P3, and P4, and the oil inlet / outlet port P2 is disconnected, corresponding to the position function (10) in the above text.

[0080] When the spool rotates 120° to the working position 5:

[0081] The mating oil port 11 is aligned with the switching oil port s6, the mating oil port 12 is aligned with the switching oil port s8, the mating oil port 13 is aligned with the switching oil port x2, and the mating oil port 14 is aligned with the switching oil port x4. At this time, the first flow-through cavity 4 connects the oil inlet / outlet ports P1 and P2, and the second flow-through cavity 5 connects the oil inlet / outlet ports P3 and P4. However, the oil inlet / outlet ports P1 and P2 are disconnected from the oil inlet / outlet ports P3 and P4, corresponding to the position function (12) in the above text.

[0082] When the spool rotates 144° to the working position 6:

[0083] Neither of the mating ports 11 and 12 is aligned with any switching port and is blocked. The mating port 13 is aligned with the switching port s2, and the mating port 14 is aligned with the switching port s4. At this time, the first flow-through cavity 4 connects the inlet / outlet ports P3 and P4, disconnects the inlet / outlet ports P1 and P2, and both P3 and P4 are disconnected from P1 and P2, corresponding to the position function (7) in the above text.

[0084] When the spool rotates 168° to the working position 7:

[0085] The mating port 11 is aligned with the switching port s5, the mating port 12 is aligned with the switching port s7, the mating port 13 is aligned with the switching port s1, and the mating port 14 is aligned with the switching port x4. At this time, the first flow-through cavity 4 connects the inlet / outlet ports P1, P2, and P3, and disconnects the inlet / outlet port P4, corresponding to the position function (8) in the above text.

[0086] When the spool rotates 192° to the working position 8:

[0087] The mating port 11 is aligned with the switching port x4, the mating port 12 is aligned with the switching port s6, the mating port 13 is aligned with the switching port x1, and the mating port 14 is aligned with the switching port s3. At this time, the first flow-through cavity 4 connects the inlet / outlet ports P2 and P4, and the second flow-through cavity 5 connects the inlet / outlet ports P1 and P3, but the inlet / outlet ports P2 and P4 are disconnected from the inlet / outlet ports P1 and P3, corresponding to the position function (13) in the above text.

[0088] When the spool rotates 216° to the working position 9:

[0089] The mating port 11 is aligned with the switching port s4, neither of the mating ports 12 and 13 is aligned with any switching port and is blocked, and the mating port 14 is aligned with the switching port x2. At this time, all the inlet / outlet ports P1, P2, P3, and P4 are disconnected from each other, corresponding to the position function (15) in the above text.

[0090] When the spool rotates 240° to the working position 10:

[0091] The mating port 11 is aligned with the switching port x3, the mating port 12 is aligned with the switching port s5, the mating port 13 is aligned with the switching port s8, and the mating port 14 is aligned with the switching port s2. At this time, the first flow-through cavity 4 connects the inlet / outlet ports P2, P3, and P4, and disconnects the inlet / outlet port P1, corresponding to the position function (11) in the above text.

[0092] When the spool rotates 264° to the working position 11:

[0093] The mating oil port 11 is aligned with the switching oil port s3, the mating oil port 12 is aligned with the switching oil port x4, the mating oil port 13 is not aligned with any switching oil port and is blocked, and the mating oil port 14 is aligned with the switching oil port s1; at this time, the first flow-through cavity 4 connects the inlet / outlet ports P1 and P4, the inlet / outlet ports P2 and P3 are disconnected, and both P1 and P4 are disconnected from P2 and P3; corresponding to the position function (4) in the above text;

[0094] When the spool rotates 288° to the working position 12:

[0095] The mating oil port 11 is aligned with the switching oil port x2, the mating oil port 12 is aligned with the switching oil port s4, the mating oil port 13 is aligned with the switching oil port s7, and the mating oil port 14 is aligned with the switching oil port x1; at this time, the first flow-through cavity 4 connects the inlet / outlet ports P2 and P3, and the second flow-through cavity 5 connects the inlet / outlet ports P1 and P4, but the inlet / outlet ports P2 and P3 are disconnected from the inlet / outlet ports P1 and P4; corresponding to the position function (14) in the above text;

[0096] When the spool rotates 312° to the working position 13:

[0097] The mating oil port 11 is aligned with the switching oil port s2, the mating oil port 12 is aligned with the switching oil port x3, the mating oil port 13 is aligned with the switching oil port s6, and the mating oil port 14 is not aligned with any switching oil port and is blocked; at this time, the first flow-through cavity 4 connects the inlet / outlet ports P1 and P3, the inlet / outlet ports P2 and P4 are disconnected, and both P1 and P3 are disconnected from P2 and P4; corresponding to the position function (3) in the above text;

[0098] When the spool rotates 336° to the working position 14:

[0099] The mating oil port 11 is aligned with the switching oil port s1, the mating oil port 12 is aligned with the switching oil port s3, the mating oil port 13 is not aligned with any switching oil port and is blocked, and the mating oil port 14 is aligned with the switching oil port s8; at this time, the first flow-through cavity 4 connects the inlet / outlet ports P1, P2, and P4, and the inlet / outlet port P3 is disconnected. Corresponding to the position function (9) in the above text;

[0100] Embodiment 2:

[0101] Refer to Figures 9 to 11, in Embodiment 2, a first oil inlet / outlet P1 to a fourth oil inlet / outlet P4 communicating with the outside are provided on the side wall of the valve body; inner wall surfaces of the valve cavity are respectively provided with a first mating oil port to a fourth mating oil port at intervals, and each mating oil port includes two independent upper oil ports and lower oil ports; a first mating upper oil port P1a to a fourth mating upper oil port P4a are arranged at the same layer height on the upper part of the inner wall surface of the valve cavity; a first mating lower oil port P1b to a fourth mating lower oil port P4b are arranged at the same layer height on the lower part of the inner wall surface of the valve cavity; and each of the mating oil ports is not directly communicated with each other; the first mating upper oil port P1a and the first mating lower oil port P1b are vertically aligned and are both communicated with the first oil inlet / outlet P1; the second mating upper oil port P2a and the second mating lower oil port P2b are vertically aligned and are both communicated with the second oil inlet / outlet P2; the third mating upper oil port P3a and the third mating lower oil port P3b are vertically aligned and are both communicated with the third oil inlet / outlet P3; the fourth mating upper oil port P4a and the fourth mating lower oil port P4b are vertically aligned and are both communicated with the fourth oil inlet / outlet P4.

[0102] Taking the axis of rotation of the valve core as the center, the inner wall surface of the valve cavity is circumferentially divided. Along the circumferential winding direction from the first mating upper oil port P1a to the second mating upper oil port P2a, the first mating upper oil port P1a and the first mating lower oil port P1b are located at the 0° position, the second mating upper oil port P2a and the second mating lower oil port P2b are located at the 72° position, the third mating upper oil port P3a and the third mating lower oil port P3b are located at the 192° position, and the fourth mating upper oil port P4a and the fourth mating lower oil port P4b are located at the 288° position.

[0103] , in Embodiment 2, the valve core 3 adopts a combined valve core; the valve core 3 is composed of a core shaft 31, a ring sleeve 32 and a coupling key 33. The valve core 3 is rotatably arranged in the valve cavity. The ring sleeve 32 is a hollow ring body and is sleeved outside the core shaft 31. The inner wall surface of the ring sleeve 32 is in sealing fit with the outer peripheral surface of the core shaft 31. The outer peripheral wall surface of the ring sleeve 32 is in liquid-sealed rotational fit with the inner wall surface of the valve cavity. The ring sleeve 32 and the core shaft 31 form a circumferential driving connection through the coupling key 33; the upper end of the core shaft 31 penetrates through the valve cover 2, and the whole valve core is rotated by rotating the core shaft 31. There are various circumferential driving connection methods between the ring sleeve 32 and the core shaft 31, such as non-circular surface connection, axial pin connection, gear and ring gear connection, etc., which belong to the prior art and will not be elaborated here.

[0104] On the outer peripheral wall surface of the mandrel 31, a first annular groove 3a1 and a second annular groove 3a2 are provided at intervals in the circumferential direction up and down. The height position where the first annular groove 3a1 is located is the same as the height where the first mating upper oil ports P1a to the fourth mating upper oil ports P4a are located; the height position where the second annular groove 3a2 is located is the same as the height where the first mating lower oil ports P1b to the fourth mating lower oil ports P4b are located; both the first annular groove 3a1 and the second annular groove 3a2 are hermetically covered by the inner wall of the collar 32. The first annular groove 3a1 forms a first flow chamber 4, and the second annular groove 3a2 forms a second flow chamber 5.

[0105] Corresponding to the height where the first mating upper oil ports P1a to the fourth mating upper oil ports P4a are located, eight switching oil ports s1 to s8 are provided on the outer peripheral wall surface of the collar 32 in the circumferential direction. The eight switching oil ports s1 to s8 respectively penetrate the collar wall in the radial direction and communicate with the first flow chamber 4; corresponding to the height where the first mating lower oil ports P1b to the fourth mating lower oil ports P4b are located, four switching oil ports x1 to x4 are provided on the outer peripheral wall surface of the collar 32 in the circumferential direction. The four switching oil ports x1 to x4 respectively penetrate the collar wall in the radial direction and communicate with the second flow chamber 5;

[0106] Refer to Figure 10 and Figure 11 Taking the axis of rotation of the valve core as the center, the outer peripheral wall surface of the collar 32 is divided. Along the circumferential direction of the first mating upper oil port P1a to the second mating upper oil port P2a, a total of eight switching oil ports s1 to s8 from the fifth to the twelfth are successively distributed at positions of 24°, 48°, 96°, 144°, 192°, 240°, 264°, and 312°. A total of four switching oil ports x1 to x4 from the first to the fourth are successively distributed at positions of 0°, 72°, 120°, and 168°. Figure 12 shows the projection position relationship of the switching oil ports s1 to s8 and x1 to x4 in the axial direction of the valve core. Figure 13 shows the connection relationship and relative distribution positions of the switching oil ports s1 to s8 with the first flow chamber 4 and x1 to x4 with the second flow chamber 5.

[0107] Combined with Figures 9 to 13 It can be known that the circumferential distribution positions of all mating oil ports in Embodiment 2 are the same as those in Embodiment 1, the circumferential distribution positions of all switching oil ports are the same as those in Embodiment 1, and the connection methods of each switching oil port with the first flow chamber and the second flow chamber are all the same as those in Embodiment 1. Therefore, the position functions of each working position in Embodiment 2 are the same as those in Embodiment 1, and will not be elaborated here.

[0108] Embodiment 3:

[0109] Refer to Figure 14 and Figure 15In Example 3, the valve core 3 also adopts a combined valve core; the valve core 3 is composed of a ring sleeve 32, a core shaft 31 and a connecting key 33. The valve core 3 is rotatably arranged in the valve cavity. The ring sleeve 32 is a hollow ring body and is sleeved on the outside of the core shaft 31. The inner wall surface of the ring sleeve 32 is sealed with the outer peripheral surface of the core shaft 31, and the outer peripheral wall surface of the ring sleeve 32 is liquid-tightly rotatably matched with the inner wall surface of the valve cavity. The ring sleeve 32 and the core shaft 31 form a circumferential drive connection through the connecting key 33, and the lower end surface of the ring sleeve 32 is in contact with the inner bottom surface of the valve cavity; the upper end of the core shaft 31 passes through the valve cover 2, and the valve core is rotated as a whole by rotating the core shaft 31; there are many circumferential drive connection methods between the ring sleeve 32 and the core shaft 31, such as non-circular surface connection, axial pin connection, gear ring connection, etc., which belong to the prior art and will not be repeated here.

[0110] Reference Figures 14 to 16 , the inner bottom surface of the valve cavity is respectively provided with the first matching oil port 11 to the fourth matching oil port 14 at intervals, and the bottom surface of the valve body 1 is provided with the first inlet and outlet oil ports P1 to the fourth inlet and outlet oil ports P4 which are communicated with the outside, and the first inlet and outlet oil ports P1 to the fourth inlet and outlet oil ports P4 are respectively communicated with the valve cavity through the corresponding first matching oil ports 11 to the fourth matching oil ports 14; taking the rotation axis of the ring sleeve 32 as the center of the circle, along the circumferential direction from the first matching oil port 11 to the second matching oil port 12, the first matching oil port 11 to the fourth matching oil port 14 are respectively located at 0°, 72°, 192° and 288°.

[0111] The outer peripheral wall of the core shaft 31 is provided with a first annular groove 3b1 and a second annular groove 3b2 at intervals in the upper and lower directions along the circumference. After assembly, the first annular groove 3b1 and the second annular groove 3b2 are both sealed and covered by the inner wall surface of the ring sleeve 32, thereby forming a first flow cavity 4 at the first annular groove 3b1 and a second flow cavity 5 at the second annular groove 3b2.

[0112] Reference Figure 15 , Figure 17 and Figure 18 , the lower end surface of the ring sleeve 32 is provided with 12 switching oil ports, namely: the first to fourth switching oil ports x1 to x4 and the fifth to twelfth switching oil ports s1 to s8, the switching oil ports x1 to x4 and s1 to s8 are all distributed on the same circumference as the first matching oil port 11 to the fourth matching oil port 14; along the circumferential direction from the first matching oil port 11 to the second matching oil port 12, the first to the fourth switching oil ports x1 to x4 are respectively located at 0°, 72°, 120°, ° and 168°, the fifth to twelfth switching oil ports s1 to s8 are respectively located at 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° positions; the ring sleeve 32 is provided with 12 independent oil passages corresponding to each switching oil port, the switching oil ports s1 to s8 are respectively connected to the first flow chamber 4 through their corresponding independent oil passages, the switching oil ports x1 to x4 are respectively connected to the second flow chamber 5 through their corresponding independent oil passages,Figure 11 Schematic diagram showing the switching of the communication relationship between the oil ports s1 to s8 and the first flow-through chamber 4, and the oil ports x1 to x4 and the second flow-through chamber 5.

[0113] Reference Figures 14 to 19 It can be seen that the circumferential distribution positions of all the mating oil ports in Embodiment 3 are the same as those in Embodiment 1, the circumferential distribution positions of all the switching oil ports are the same as those in Embodiment 1, and the connection modes of each switching oil port with the first flow-through chamber and the second flow-through chamber are the same as those in Embodiment 1. Therefore, the position functions of each working position in Embodiment 2 are the same as those in Embodiment 1.

[0114] In this embodiment, the inner wall of the collar 32 is provided with two levels of steps, the first and the second, from top to bottom. The outer periphery of the core shaft 3 forms a stepped shape with a gradually decreasing diameter from top to bottom. The first step is located in the area of the first flow-through chamber, and the second step is located in the area of the second flow-through chamber. The oil in the first flow-through chamber and the second flow-through chamber respectively generates a downward thrust through the first step surface and the second step surface, pressing the collar tightly against the bottom surface of the valve cavity, so as to achieve a better sealing effect between the bottom surface of the collar and the bottom surface of the valve cavity.

[0115] In summary, the rotary reversing valve described in the present invention has a relatively large number of position functions and is convenient to use, which can make the design and operation of the fluid transmission system more flexible and simple; at the same time, the structure is relatively simple, easy to process and manufacture, and the cost is relatively low.

[0116] The above is only a preferred embodiment of the present invention, and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotary four-way reversing valve, comprising a valve body, a valve cover and a valve core, the valve core is rotatably arranged in the valve cavity of the valve body, and is characterized in that: The valve body is provided with first to fourth oil inlet / outlet ports communicating with the outside. The inner wall surface of the valve cavity is respectively provided with first to fourth mating oil ports at intervals. The first to fourth oil inlet / outlet ports are respectively communicated with the valve cavity through the corresponding first to fourth mating oil ports; the valve core is provided with a first annular groove and a second annular groove at intervals in the circumferential and vertical directions. The first annular groove and the second annular groove correspondingly form independent first and second flow-through cavities; 12 switching oil ports are also provided at intervals on the outer surface of the valve core in the circumferential direction. Each switching oil port is only communicated with one of the first and second flow-through cavities. The valve core, through the first annular groove, the second annular groove and the 12 switching oil ports provided at intervals, cooperates with the first to fourth oil inlet / outlet ports and the first to fourth mating oil ports provided on the valve body to form 15 working positions distributed along 360°. By rotating the valve core to different working positions, different switching oil ports are aligned and communicated with the mating oil ports, so as to realize different position functions among the first to fourth oil inlet / outlet ports; when the valve core rotates one week, each oil inlet / outlet port can only be correspondingly connected with each switching oil port through the corresponding mating oil port once and only once in sequence.

2. The rotary four-way reversing valve according to claim 1, characterized in that: The circumferential interval angle between two adjacent working positions is θ, and the circumferential interval angle between two adjacent switching oil ports is an integer multiple of T*θ, where T is a positive integer.

3. The rotary four-way reversing valve according to claim 1, characterized in that: The circumferential interval angle between two adjacent working positions is 24°. Taking the rotation axis of the valve core as the center of the circle, the first to fourth mating oil ports are successively located at the positions of 0°, 72°, 192° and 288°; along the same circumferential indexing and winding direction, the 12 switching oil ports are successively located at the positions of 0°, 24°, 48°, 72°, 96°, 120°, 144°, 168°, 192°, 240°, 264° and 312°; among them, 8 switching oil ports located at the positions of 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° are respectively communicated with the first flow-through cavity, and 4 switching oil ports located at the positions of 0°, 72°, 120° and 168° are respectively communicated with the second flow-through cavity.

4. The rotary four-way reversing valve according to claim 3, characterized in that: The first annular groove and the second annular groove are covered by the inner wall surface of the valve cavity, correspondingly forming independent first and second flow-through cavities; the first annular groove is higher than the first to fourth mating oil ports, and the second annular groove is lower than the first to fourth mating oil ports. The first and second flow-through cavities are not directly communicated with the first to fourth mating oil ports; the 12 switching oil ports are all located between the first annular groove and the second annular groove, and one end of each switching oil port is provided with an open end; the open ends of 8 switching oil ports located at the positions of 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° are upward and communicated with the first annular groove, and the other end of the switching oil port is closed, and the lower edge of the closed end is not higher than the lower edge of the first to fourth mating oil ports; the open ends of 4 switching oil ports located at the positions of 0°, 72°, 120° and 168° are downward and communicated with the second annular groove, and the other end of the switching oil port is closed, and the upper edge of the closed end is not lower than the upper edge of the first to fourth mating oil ports.

5. The rotary four-way reversing valve according to claim 1, wherein: The described valve core is composed of a core shaft, a ring sleeve and a coupling key. The ring sleeve is sleeved outside the core shaft and forms a circumferential driving connection with the core shaft through the coupling key. The first ring groove and the second ring groove are arranged on the outer peripheral wall surface of the core shaft. Both the first ring groove and the second ring groove are hermetically covered by the inner wall surface of the ring sleeve and correspondingly form a first flow passage chamber and a second flow passage chamber; 12 switching oil ports are arranged on the ring sleeve at intervals in the circumferential direction, and each switching oil port is only communicated with one of the first flow passage chamber and the second flow passage chamber. The core shaft, through the first ring groove, the second ring groove and the 12 switching oil ports, cooperates with the first to fourth oil inlet / outlet ports and the first to fourth mating oil ports arranged on the valve body to form 15 working positions distributed along 360°. By rotating the core shaft to different working positions, different switching oil ports are switched to be aligned and communicated with the mating oil ports, so as to realize different position functions between the first to fourth oil inlet / outlet ports; when the core shaft rotates one week, each oil inlet / outlet port can only be correspondingly connected with each switching oil port uniquely once in sequence through the corresponding mating oil port.

6. The rotary four-way reversing valve according to claim 5, wherein: The first to fourth oil inlet / outlet ports are arranged on the side wall of the valve body; among the first to fourth mating oil ports, each mating oil port includes two independent upper oil ports and lower oil ports; the first to fourth mating upper oil ports are arranged on the upper part of the inner wall surface of the valve cavity at the same layer height; the first to fourth mating lower oil ports are arranged on the lower part of the inner wall surface of the valve cavity at the same layer height; and each of the mating oil ports is not directly communicated with each other; the first mating upper oil port and the first mating lower oil port are vertically aligned and are both communicated with the first oil inlet / outlet port; the second mating upper oil port and the second mating lower oil port are vertically aligned and are both communicated with the second oil inlet / outlet port; the third mating upper oil port and the third mating lower oil port are vertically aligned and are both communicated with the third oil inlet / outlet port; the fourth mating upper oil port and the fourth mating lower oil port are vertically aligned and are both communicated with the fourth oil inlet / outlet port.

7. The rotary four-way reversing valve according to claim 6, characterized in that: Circumferentially divide the inner wall surface of the valve cavity with the axis of rotation of the valve core as the center. Along the circumferential winding direction from the first mating upper oil port to the second mating upper oil port, the first mating upper oil port and the first mating lower oil port are located at the 0° position, the second mating upper oil port and the second mating lower oil port are located at the 72° position, the third mating upper oil port and the third mating lower oil port are located at the 192° position, and the fourth mating upper oil port and the fourth mating lower oil port are located at the 288° position; the height position where the first annular groove is located is the same as the height where the first to fourth mating upper oil ports are located; the height position where the second annular groove is located is the same as the height where the first to fourth mating lower oil ports are located; corresponding to the height where the first to fourth mating upper oil ports are located, 8 switching oil ports are circumferentially provided on the outer peripheral wall of the ring sleeve, and the 8 switching oil ports respectively penetrate the ring sleeve wall in the radial direction and communicate with the first flow-through cavity; corresponding to the height where the first to fourth mating lower oil ports are located, 4 switching oil ports are circumferentially provided on the outer peripheral wall of the ring sleeve, and the 4 switching oil ports respectively penetrate the ring sleeve wall in the radial direction and communicate with the second flow-through cavity; circumferentially divide the outer peripheral wall of the ring sleeve with the axis of rotation of the valve core as the center. Along the circumferential winding direction from the first mating upper oil port to the second mating upper oil port, a total of 8 switching oil ports from the fifth to the twelfth are sequentially distributed at the 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° positions, and a total of 4 switching oil ports from the first to the fourth are sequentially distributed at the 0°, 72°, 120° and 168° positions.

8. The rotary four-way reversing valve according to claim 5, characterized in that: The first to fourth mating oil ports are arranged on the inner bottom surface of the valve cavity, and the first to fourth oil inlet and outlet ports are arranged on the bottom surface of the valve body; with the axis of rotation of the ring sleeve as the center, along the circumferential winding direction from the first mating oil port to the second mating oil port, the first to fourth mating oil ports are sequentially located at the 0°, 72°, 192° and 288° positions.

9. The rotary four-way reversing valve according to claim 8, wherein: The 12 switching oil ports are arranged on the lower end surface of the ring sleeve and are on the same circumference as the first to fourth mating oil ports; along the circumferential winding direction from the first mating oil port to the second mating oil port, the first to fourth switching oil ports are respectively located at the 0°, 72°, 120° and 168° positions, and the fifth to twelfth switching oil ports are respectively located at the 24°, 48°, 96°, 144°, 192°, 240°, 264° and 312° positions; 12 independent oil channels corresponding to each switching oil port are respectively provided on the ring sleeve, and the fifth to twelfth switching oil ports respectively communicate with the first flow-through cavity through their respective corresponding independent oil channels, and the first to fourth switching oil ports respectively communicate with the second flow-through cavity through their respective independent oil channels.

10. The rotary four-way reversing valve according to claim 8, characterized in that: The inner wall of the ring sleeve is provided with two levels of steps, the first and the second, from top to bottom. The outer periphery of the core shaft forms a stepped shape with a gradually decreasing diameter from top to bottom. The first step is located in the area of the first flow-through cavity, and the second step is located in the area of the second flow-through cavity.

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