Reversing valve

Abstract

The invention discloses a reversing valve which comprises a lower shell, an upper shell and a flow guide assembly. The flow guide assembly comprises a first flow guide hole, a second flow guide hole and a third flow guide hole which penetrate through the flow guide cylinder; the first flow guide hole can be communicated with the connecting pipe A and the connecting pipe T, the second flow guide hole is connected with the connecting pipe P, and the connecting pipe B can be communicated with the connecting pipe P and the connecting pipe T; and when the motor drives the flow guide cylinder to rotate, the connecting pipe A is communicated with the two T-shaped connecting pipes, and the connecting pipe B is communicated with the connecting pipe P. According to the reversing valve, through innovative structural design and sealing measures, the problems that a traditional reversing valve is large in frictional wear, prone to impurity accumulation, unreliable in sealing and the like are effectively solved, meanwhile, the manual driving function is achieved, the performance, reliability and usability of equipment are improved, and the service life of the equipment is prolonged. The method has a wide application prospect in the fields of industrial automatic production and fluid control.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic reversing valves, and in particular to a reversing valve. Background Art

[0002] In the fields of industrial automation and fluid control, directional control valves, as key components for switching fluid flow directions, are widely used in hydraulic and pneumatic systems, as well as various fluid delivery pipelines. Their performance directly impacts the efficiency, stability, and reliability of the entire system. Traditional directional control valves typically use electromagnetic drive to control the horizontal movement of the valve core to switch fluid channels.

[0003] However, this design has numerous drawbacks in practical applications. First, the frequent contact and separation between the valve core and the valve body generates intense friction, which not only increases energy loss but also accelerates wear of the valve core and valve body, shortening equipment life and increasing maintenance costs. Second, during long-term operation, impurities such as metal debris inevitably enter the fluid. These impurities easily accumulate in the gap between the valve core and the valve body, further exacerbating wear and even causing the valve core to become stuck or the seal to fail, seriously affecting the proper functioning of the reversing valve.

[0004] To this end, the present application proposes a reversing valve. Summary of the Invention

[0005] The purpose of the present invention is to solve the above technical problems and to propose a reversing valve.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A reversing valve comprises a lower housing and an upper housing, wherein a semi-cylindrical groove is provided on a surface of the lower housing opposite to the upper housing, wherein a guide cylinder driven to rotate by a motor is rotatably connected in the two semi-cylindrical grooves, an A connecting pipe and a B connecting pipe connected to the semi-cylindrical grooves are installed at the upper end of the upper housing, and a P connecting pipe and two T connecting pipes connected to the semi-cylindrical grooves are installed at the bottom of the lower housing; The flow guide assembly includes a first flow guide hole, a second flow guide hole, and a third flow guide hole provided through the flow guide tube; the first flow guide hole can be connected to the A connecting pipe and the T connecting pipe, the second flow guide hole is connected to the P connecting pipe, and the B connecting pipe can be connected to the P connecting pipe and the T connecting pipe; The A connecting pipe is connected to the P connecting pipe, and the B connecting pipe is connected to the two T connecting pipes. When the motor drives the guide tube to rotate 90 degrees, the A connecting pipe is connected to the two T connecting pipes, and the B connecting pipe is connected to the P connecting pipe.

[0007] Preferably, a sealing ring is installed between the lower shell and the upper shell, and the upper shell is detachably mounted on the lower shell by bolts.

[0008] Preferably, the motor is mounted on the lower shell, the output end of the motor is fixedly connected to a drive shaft, the drive shaft is coaxially fixedly connected to the guide cylinder, and first arc grooves are provided on the lower shell and the upper shell. The drive shaft is located in the two first arc grooves and rotates in a sealed manner.

[0009] Preferably, a manual drive mechanism is also included, which includes a rotating rod coaxially fixedly connected to the guide cylinder, a second arc groove is provided on the lower shell and the upper shell, the rotating rod is located between the two second arc grooves and is sealed and rotatably connected thereto, an installation box is installed on the lower shell, a meshing worm wheel and a worm are provided in the installation box, a one-way bearing is fixed on the rotating rod, the one-way bearing is located in the inner ring of the worm wheel and is interference fit, a rotating shaft is fixedly connected to the worm, the rotating shaft passes through the installation box and is rotatably connected thereto, and a handle is fixed on the rotating shaft.

[0010] Preferably, a U-shaped flow channel connected to two T-connecting pipes is provided in the lower shell body, and two lower delivery flow channels connected to the U-shaped flow channel are provided at the upper end of the lower shell body, and a pressure relief valve is installed in the lower delivery flow channel. Two upper delivery flow channels connected to the A connecting pipe and the B connecting pipe are provided at the bottom of the upper shell body, and the lower delivery flow channels are arranged opposite to the upper delivery flow channels.

[0011] Preferably, it further comprises a cleaning mechanism capable of cleaning the inner wall of the semi-cylindrical groove, and the cleaning mechanism is multiple and arranged opposite to the first guide hole, the second guide hole and the third guide hole.

[0012] Preferably, the cleaning mechanism includes two support blocks fixed on the inner wall of the guide tube, a cross block is fixed on the support block, a short shaft with a rotatable arrangement passes through the cross block, a mounting block is fixed on the short shaft, a plurality of spiral leaves are fixed on the mounting block, a mounting shaft is fixed on the end of the mounting block opposite to the short shaft, and a plurality of magnetic rods are installed on the mounting shaft.

[0013] Preferably, the mounting shaft and the magnetic rod are the first guide hole, the second guide hole, and the third guide hole, and the mounting shaft and the magnetic rod do not abut against the inner wall of the semi-cylindrical groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The reversing valve of this invention utilizes a rotational drive mechanism. A motor drives the guide cylinder to rotate within a semi-cylindrical groove, and fluid flow direction switching is achieved by utilizing the coordination of the guide holes on the guide cylinder with the connecting pipe and flow channel. This design avoids the direct contact and friction between the valve core and the valve body in traditional structures, significantly reducing friction losses, effectively extending the service life of the device, improving the stability and reliability of the reversing valve, and reducing the costs associated with frequent maintenance and component replacement.

[0015] 2. A cleaning mechanism is installed on the inner wall of the guide tube, corresponding to the guide hole. When the guide tube rotates, the magnetic rod rotates with it and absorbs metal debris in the guide hole. When liquid flows through the guide hole, the liquid impacts the spiral blades, driving the spiral blades, mounting block, and short shaft to rotate, generating a spiral of liquid that flushes the metal debris absorbed by the magnetic rod out of the reversing valve. This design effectively prevents the accumulation of impurities between the guide hole and the inner wall of the semi-cylindrical groove, avoiding the problems of increased wear and equipment damage caused by impurities entering the semi-cylindrical groove and the guide tube, further ensuring the normal operation of the reversing valve.

[0016] 3. When the motor is operating normally, forward rotation drives the guide tube and the rotating rod. Driven by the one-way bearing, the rotating rod idles and does not drive the worm gear. When the motor is damaged and unable to operate, the operator manually turns the handle to drive the rotating shaft and worm. The rotation of the worm drives the worm gear, and the one-way bearing drives the rotating rod and the guide tube. This design avoids the drawback of the reversing valve not being able to operate after a motor failure, improves the equipment's availability and emergency response capabilities, ensures that fluid flow direction can be switched in all situations, and guarantees the continuity of the production process.

[0017] In summary, the reversing valve of the present invention effectively solves the problems of large friction and wear, easy accumulation of impurities, unreliable sealing, etc. of traditional reversing valves through innovative structural design and sealing measures. At the same time, it has a manual drive function, which improves the performance, reliability and availability of the equipment, and has broad application prospects in the fields of industrial automation production and fluid control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a reversing valve proposed by the present invention; Figure 2 A front view of a reversing valve proposed by the present invention; Figure 3 This is a disassembled diagram of a reversing valve proposed by the present invention; Figure 4 This is a schematic diagram of a first guide hole in a reversing valve proposed by the present invention; Figure 5 This is a schematic diagram of a third guide hole in a reversing valve proposed by the present invention; Figure 6 This is a structural schematic diagram of a U-shaped flow channel in a reversing valve proposed by the present invention; Figure 7 This is a structural schematic diagram of a cleaning mechanism in a reversing valve proposed by the present invention; Figure 8 This is a schematic structural diagram of a worm gear in a reversing valve proposed by the present invention; Figure 9 This is a structural schematic diagram of a reversing valve proposed in the present invention.

[0019] In the figure: 1 lower shell, 2 upper shell, 3A connecting pipe, 4B connecting pipe, 5T connecting pipe, 6P connecting pipe, 7 motor, 8 mounting box, 9 handle, 10 semi-cylindrical groove, 11 drive shaft, 12 rotating rod, 13 lower delivery channel, 14 guide tube, 15 U-shaped flow channel, 16 first guide hole, 17 second guide hole, 18 third guide hole, 19 support block, 20 cross block, 21 short shaft, 22 mounting block, 23 spiral blade, 24 mounting shaft, 25 magnetic rod, 26 worm gear, 27 one-way bearing, 28 rotating shaft, 29 worm, 30 bolt, 31 first arcuate groove, 32 second arcuate groove, 33 upper delivery channel, 34 pressure relief valve. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figures 1-9 A reversing valve includes a lower shell 1 and an upper shell 2. A semi-cylindrical groove 10 is provided on the opposite side of the lower shell 1 and the upper shell 2. A sealing ring is installed between the lower shell 1 and the upper shell 2. The upper shell 2 is detachably mounted on the lower shell 1 by bolts 30. This ensures that the two semi-cylindrical grooves 10 can form a complete and sealed cylindrical chamber that can hold the guide tube 14.

[0022] A guide cylinder 14 driven to rotate by a motor 7 is rotatably connected in the two semi-cylindrical grooves 10. The motor 7 is mounted on the lower shell 1. A drive shaft 11 is fixedly connected to the output end of the motor 7. The drive shaft 11 is coaxially fixedly connected to the guide cylinder 14. A first arc groove 31 is provided on both the lower shell 1 and the upper shell 2. The drive shaft 11 is located in the two first arc grooves 31 and rotates in a sealed manner.

[0023] Further explanation: To ensure sealed rotation of the drive shaft 11 within the first arcuate groove 31, a multi-layer composite sealing structure is installed at the contact point between the drive shaft 11 and the first arcuate groove 31. This sealing structure comprises, from the inside out, a wear-resistant lubricating sleeve, an elastic sealing ring, and a dustproof protective sleeve. The wear-resistant lubricating sleeve is made of a high-strength, low-friction polytetrafluoroethylene composite material and fits tightly against the outer surface of the drive shaft 11. While providing excellent lubrication, it effectively reduces friction and wear between the drive shaft 11 and the sealing structure, extending its service life. The elastic sealing ring is made of fluororubber, a material with excellent elasticity and chemical resistance. Its unique lip-shaped design allows it to fit tightly against the outer wall of the drive shaft 11 and the inner wall of the first arcuate groove 31, forming a reliable sealing barrier that effectively prevents leakage of external dust, moisture, and internal fluids. The dustproof protective sleeve is made of a high-strength, ageing-resistant nylon material and covers the outer surface of the elastic sealing ring, providing protection against damage to the sealing structure from sharp objects and further blocking the intrusion of dust and impurities.

[0024] During the rotation of the drive shaft 11, the wear-resistant lubricating sleeve rotates synchronously with the drive shaft 11, forming a uniform and stable lubricating film between its surface and the elastic sealing ring, reducing frictional resistance and energy loss, ensuring the smooth and stable rotation of the drive shaft 11. The elastic sealing ring, thanks to its inherent elastic deformation capability, always maintains close contact with the drive shaft 11 and the inner wall of the first arcuate groove 31. Even if the drive shaft 11 experiences a certain degree of radial runout or axial movement, the sealing state can be adjusted promptly to ensure that the sealing effect is not affected.

[0025] A guide cylinder 14, driven by a motor 7, is rotatably connected to the two semi-cylindrical grooves 10. To ensure an effective seal between the guide cylinder 14 and the semi-cylindrical grooves 10 without hindering the normal rotation of the guide cylinder 14, multiple layers of high-performance sealing rings are installed on the outside of the guide cylinder 14. These sealing rings are made of a high-quality rubber material with high elasticity, wear resistance, and corrosion resistance. Their specially designed cross-section shape allows them to closely fit the outer wall of the guide cylinder 14 and the inner wall of the semi-cylindrical groove 10, forming a reliable sealing barrier.

[0026] During installation, the sealing ring is precisely fitted into the pre-set sealing groove on the outer surface of the guide tube 14. The size and shape of the sealing groove perfectly match the sealing ring, ensuring that the sealing ring will not shift or fall off during the rotation of the guide tube 14. When the guide tube 14 begins to rotate under the drive of the motor 7, the sealing ring, due to its inherent elasticity and good flexibility, can flexibly deform as the guide tube 14 rotates, always maintaining close contact with the inner wall of the semi-cylindrical groove 10, thereby effectively preventing leakage of the internal fluid. At the same time, to reduce the frictional resistance between the sealing ring and the inner wall of the semi-cylindrical groove 10 and ensure the smooth rotation of the guide tube 14, the surface of the sealing ring has undergone a special lubrication treatment, forming a uniform and long-lasting lubricating film. This lubricating film not only reduces the friction coefficient and energy loss, but also prevents the seal ring from wear and aging due to excessive friction, greatly extending the service life of the seal ring.

[0027] The upper end of the upper shell 2 is provided with an A connecting pipe 3 and a B connecting pipe 4 communicating with the semi-cylindrical groove 10, and the bottom of the lower shell 1 is provided with a P connecting pipe 6 and two T connecting pipes 5 communicating with the semi-cylindrical groove 10; a U-shaped flow channel 15 connected to the two T connecting pipes 5 is provided in the lower shell 1, and the upper end of the lower shell 1 is provided with two lower conveying flow channels 13 communicating with the U-shaped flow channel 15, and a pressure relief valve 34 is installed in the lower conveying flow channel 13. The bottom of the upper shell 2 is provided with two upper conveying flow channels 33 respectively communicating with the A connecting pipe 3 and the B connecting pipe 4, and the lower conveying flow channel 13 is arranged opposite to the upper conveying flow channel 33.

[0028] The guide assembly includes a first guide hole 16, a second guide hole 17, and a third guide hole 18 that are arranged through the guide tube 14. The first guide hole 16 and the third guide hole 18 are distributed at an angle of 90 degrees on the circumference of the guide tube 14. There are three second guide holes 17, and the angle distribution on the circumference is 270 degrees. The angle between two adjacent holes is 90 degrees.

[0029] The first guide hole 16 can be connected to the A connecting pipe 3 and the T connecting pipe 5 , the second guide hole 17 is connected to the P connecting pipe 6 , and the B connecting pipe 4 can be connected to the P connecting pipe 6 and the T connecting pipe 5 .

[0030] The A connecting pipe 3 is connected to the P connecting pipe 6, and the B connecting pipe 4 is connected to the two T connecting pipes 5. When the motor 7 drives the guide tube 14 to rotate 90 degrees, the A connecting pipe 3 is connected to the two T connecting pipes 5, and the B connecting pipe 4 is connected to the P connecting pipe 6.

[0031] When the present invention is used, when the A connecting pipe 3, the B connecting pipe 4, and the P connecting pipe 6 are liquid inlet pipes, at this time, the first guide hole 16 is opposite to the A connecting pipe 3, and the third guide hole 18 is not opposite to the B connecting pipe 4, that is, the B connecting pipe 4 is in a blocked state, and the liquid enters through the A connecting pipe 3, the B connecting pipe 4, and the P connecting pipe 6, and the liquid enters the guide cylinder 14 through the A connecting pipe 3 and the first guide hole 16. As the liquid pressure increases, the pressure in the lower delivery channel 13 opposite to the first guide hole 16 increases. When the pressure is large, the pressure in the lower delivery channel 13 increases. When the pressure relief valve 34 reaches the threshold, the pressure relief valve 34 opens, and the liquid in the A connecting pipe 3 and the P connecting pipe 6 flows into the lower delivery channel 13. The liquid flows into the U-shaped channel 15 through the lower delivery channel 13, and then flows into the two T connecting pipes 5 through the U-shaped channel 15 for discharge. Similarly, the liquid in the B connecting pipe 4 also flows into the two T connecting pipes 5 through the lower delivery channel 13 and the U-shaped channel 15. That is, the A connecting pipe 3, the B connecting pipe 4, and the P connecting pipe 6 are input ends, and the two T connecting pipes 5 are output ends.

[0032] When the A connecting pipe 3 and the P connecting pipe 6 need to be connected, as in the above state, the first guide hole 16 is opposite to the A connecting pipe 3, and the A connecting pipe 3 and the B connecting pipe 4 are both inlet ends. The liquid enters the guide tube 14 through the A connecting pipe 3 and the first guide hole 16. At this time, the second guide hole 17 is connected to the P connecting pipe 6, and the liquid flows to the P connecting pipe 6 through the second guide hole 17 for discharge, thereby realizing the connection between the A connecting pipe 3 and the P connecting pipe 6; since the B connecting pipe 4 is blocked by the guide tube 14, the liquid in the B connecting pipe 4 flows into the lower delivery channel 13. When the pressure is greater than the threshold of the pressure relief valve 34, the pressure relief valve 34 opens, and the liquid flows through the lower delivery channel 13 to the U-shaped channel 15, and then flows through the U-shaped channel 15 to the two T connecting pipes 5 for discharge. The B connecting pipe 4 is connected to the two T connecting pipes 5.

[0033] When the B connecting pipe 4 is connected to the P connecting pipe 6, the motor 7 drives the drive shaft 11 to rotate, and the rotation of the drive shaft 11 drives the guide cylinder 14 to rotate. The rotation of the guide cylinder 14 causes the third guide hole 18 to be connected to the B connecting pipe 4, and the A connecting pipe 3 is not opposite to the first guide hole 16, and the A connecting pipe 3 is blocked; at this time, the second guide hole 17 is connected to the P connecting pipe 6, and the liquid flows into the guide cylinder 14 through the B connecting pipe 4 and the third guide hole 18, and is finally discharged through the P connecting pipe 6. As mentioned above, the liquid in the A connecting pipe 3 flows into the U-shaped flow channel 15 through the lower delivery channel 13, and then flows into the two T connecting pipes 5 through the U-shaped flow channel 15 for discharge. The A connecting pipe 3 is connected to the two T connecting pipes 5.

[0034] As mentioned above, the present invention changes the original electromagnetic driven horizontal movement into rotational movement, which greatly reduces the friction of contact and separation in the existing technology, and also reduces the probability of severe wear caused by debris on the valve core and valve body during movement, resulting in a longer service life and greater stability.

[0035] As another embodiment of the present invention: it also includes a manual drive mechanism, the manual drive mechanism includes a rotating rod 12 coaxially fixedly connected to the guide tube 14, a second arc groove 32 is provided on the lower shell 1 and the upper shell 2, the rotating rod 12 is located between the two second arc grooves 32 and is sealed and rotatably connected thereto, a mounting box 8 is installed on the lower shell 1, and a meshing worm gear 26 and a worm 29 are provided in the mounting box 8, and a one-way bearing 27 is fixed on the rotating rod 12. Due to the cooperation of the one-way bearing 27, for example, when the motor 7 rotates forward, it drives the guide tube 14 and the rotating rod 12 to rotate. Under the action of the one-way bearing 27, the rotating rod 12 rotates idly and will not drive the worm gear 26 to rotate.

[0036] The one-way bearing 27 is located in the inner ring of the worm wheel 26 and is interference fit. The worm 29 is fixedly connected to the rotating shaft 28, which passes through the installation box 8 and is rotatably connected thereto. The handle 9 is fixed to the rotating shaft 28.

[0037] When the motor 7 is damaged and cannot work, the staff manually turns the handle 9, and the rotation of the handle 9 drives the rotating shaft 28 and the worm 29 to rotate. The rotation of the worm 29 drives the worm wheel 26 to rotate. Under the transmission of the one-way bearing 27, the rotating rod 12 and the guide tube 14 are rotated. This can avoid the disadvantage that the reversing valve cannot work after the motor 7 is damaged.

[0038] Since metal debris and the like are inevitably present in the liquid when the reversing valve is in use, although a filtering structure is provided on the outside, when the first guide holes 16, the second guide holes 17, and the third guide holes 18 are blocked and the liquid cannot flow, some metal debris will accumulate between the first guide holes 16, the second guide holes 17, the third guide holes 18 and the inner wall of the semi-cylindrical groove 10. If these debris are not cleaned, when the guide tube 14 rotates, metal debris will enter between the semi-cylindrical groove 10 and the guide tube 14, causing severe wear or even damage.

[0039] As another embodiment of the present invention: it also includes a cleaning mechanism capable of cleaning the inner wall of the semi-cylindrical groove 10, and the cleaning mechanism is multiple and arranged opposite to the first guide hole 16, the second guide hole 17, and the third guide hole 18. The cleaning mechanism includes two support blocks 19 fixed to the inner wall of the guide cylinder 14, a cross block 20 is fixed on the support block 19, and a short shaft 21 that is rotatably arranged is passed through the cross block 20, a mounting block 22 is fixed on the short shaft 21, and a plurality of spiral leaves 23 are fixed on the mounting block 22. A mounting shaft 24 is fixed on the end of the mounting block 22 opposite to the short shaft 21, and a plurality of magnetic rods 25 are installed on the mounting shaft 24. The mounting shaft 24 and the magnetic rods 25 are all the first guide hole 16, the second guide hole 17, and the third guide hole 18, and the mounting shaft 24 and the magnetic rods 25 do not abut the inner wall of the semi-cylindrical groove 10.

[0040] The magnetic rod 25 and the like will rotate along with the guide tube 14, and the magnetic rod 25 will absorb the metal debris in the first guide hole 16, the second guide hole 17, and the third guide hole 18. When liquid flows through the first guide hole 16, the second guide hole 17, and the third guide hole 18, the liquid will impact the spiral leaf 23, thereby driving the spiral leaf 23, the mounting block 22, and the short shaft 21 to rotate, so as to generate a spiral liquid, which can wash away the metal debris absorbed on the magnetic rod 25, thereby cleaning the metal debris and discharging it to the outside of the reversing valve, thereby protecting the reversing valve.

[0041] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A reversing valve, comprising a lower housing (1) and an upper housing (2), characterized in that: The lower shell (1) and the upper shell (2) are both provided with a semi-cylindrical groove (10) on a side opposite to the upper shell. A guide tube (14) driven to rotate by a motor (7) is rotatably connected in the two semi-cylindrical grooves (10). The upper end of the upper shell (2) is provided with an A connecting pipe (3) and a B connecting pipe (4) in communication with the semi-cylindrical groove (10). The bottom of the lower shell (1) is provided with a P connecting pipe (6) in communication with the semi-cylindrical groove (10) and two T connecting pipes (5). A flow guide assembly; the flow guide assembly comprises a first flow guide hole (16), a second flow guide hole (17), and a third flow guide hole (18) provided through the flow guide tube (14); the first flow guide hole (16) can be connected to the A connecting pipe (3) and the T connecting pipe (5); the second flow guide hole (17) is connected to the P connecting pipe (6); and the B connecting pipe (4) can be connected to the P connecting pipe (6) and the T connecting pipe (5); The A connecting pipe (3) is connected to the P connecting pipe (6), and the B connecting pipe (4) is connected to the two T connecting pipes (5). When the motor (7) drives the guide tube (14) to rotate 90 degrees, the A connecting pipe (3) is connected to the two T connecting pipes (5), and the B connecting pipe (4) is connected to the P connecting pipe (6).

2. A reversing valve according to claim 1, characterized in that: A sealing ring is installed between the lower shell (1) and the upper shell (2), and the upper shell (2) is detachably mounted on the lower shell (1) via bolts (30).

3. A reversing valve according to claim 1, characterized in that: The motor (7) is mounted on the lower housing (1), and the output end of the motor (7) is fixedly connected to a drive shaft (11). The drive shaft (11) is coaxially fixedly connected to the guide tube (14). The lower housing (1) and the upper housing (2) are both provided with first arcuate grooves (31). The drive shaft (11) is located in the two first arcuate grooves (31) and rotates in a sealed manner.

4. A reversing valve according to claim 2, characterized in that: The invention also includes a manual drive mechanism, which includes a rotating rod (12) coaxially fixedly connected to the guide tube (14), the lower shell (1) and the upper shell (2) are both provided with a second arc groove (32), the rotating rod (12) is located between the two second arc grooves (32) and is sealed and rotatably connected thereto, the lower shell (1) is provided with a mounting box (8), the mounting box (8) is provided with a meshing worm wheel (26) and a worm (29), a one-way bearing (27) is fixed on the rotating rod (12), the one-way bearing (27) is located in the inner ring of the worm wheel (26) and is interference fit, the worm (29) is fixedly connected to a rotating shaft (28), the rotating shaft (28) passes through the mounting box (8) and is rotatably connected thereto, and a handle (9) is fixed on the rotating shaft (28).

5. The reversing valve according to claim 1, characterized in that: The lower shell (1) is provided with a U-shaped flow channel (15) connected to the two T-connecting pipes (5), the upper end of the lower shell (1) is provided with two lower delivery flow channels (13) connected to the U-shaped flow channel (15), and the lower delivery flow channels (13) are installed with a pressure relief valve (34). The bottom of the upper shell (2) is provided with two upper delivery flow channels (33) respectively connected to the A connection pipe (3) and the B connection pipe (4), and the lower delivery flow channels (13) and the upper delivery flow channels (33) are arranged opposite to each other.

6. The reversing valve according to claim 1, characterized in that: It also includes a cleaning mechanism capable of cleaning the inner wall of the semi-cylindrical groove (10), wherein the cleaning mechanisms are multiple and are arranged opposite to the first guide hole (16), the second guide hole (17), and the third guide hole (18).

7. A reversing valve according to claim 6, characterized in that: The cleaning mechanism comprises two support blocks (19) fixed to the inner wall of the guide tube (14), a transverse block (20) fixed on the support block (19), a rotatably arranged short shaft (21) passing through the transverse block (20), a mounting block (22) fixed on the short shaft (21), a plurality of spiral blades (23) fixed on the mounting block (22), a mounting shaft (24) fixed on the end of the mounting block (22) opposite to the short shaft (21), and a plurality of magnetic rods (25) mounted on the mounting shaft (24).

8. The reversing valve according to claim 7, characterized in that: The mounting shaft (24) and the magnetic rod (25) are the first guide hole (16), the second guide hole (17), and the third guide hole (18), and the mounting shaft (24) and the magnetic rod (25) do not abut against the inner wall of the semi-cylindrical groove (10).

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