A reversing valve

Abstract

The present invention relates to a reversing valve, comprising: a valve body, on which an A port, a P port, a T port and a B port are provided, both ends of the valve body are fixedly connected to valve covers, and both valve covers are fixedly connected to motors; a distribution plate, which is arranged inside the center of the valve body; a left valve core, which is rotatably connected to the inside of the valve body and contacts the left end face of the distribution plate; and a right valve core, which is rotatably connected to the inside of the valve body and contacts the right end face of the distribution plate. The advantages of the present invention are that the left valve core and the distribution plate, as well as the right valve core and the distribution plate are matched together by using a plane seal, and then the rotation of the left valve core and the right valve core can be used to change the direction of the oil circuit, so that the overall volume of the reversing valve is compact, and the various flow channels on the left valve core, the distribution plate and the right valve core are simplified, thereby reducing the processing difficulty and manufacturing cost.

Description

Technical Field

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

[0002] In traditional hydraulic systems, the control elements that control and change the direction of hydraulic system fluid flow are collectively referred to as reversing valves. Reversing valves are a common type of valve. The existing reversing valves generally control two load oil ports through a valve core. Since the opening relationship between the two load ports is determined by the design of the valve core, the flow and pressure at the two load ports cannot be controlled separately and independently during use. However, due to working conditions, a solution of using two valve cores to independently control the two load ports has been derived. This solution can indeed solve the problem of independent control of the two load ports, but this solution still has the following problems:

[0003] 1. In the prior art, the reversing valve with independent control of the load port of the dual valve core is composed of two valve cores slidingly fitted in two independent valve holes, which makes the overall volume of the reversing valve larger, and in order to connect the relevant valve ports of the two valve holes, the flow channel in the valve body is complex and the valve body is difficult to process, resulting in high manufacturing costs;

[0004] 2. In the prior art, the reversing valve with independently controlled load ports of dual valve cores needs to use electric control to control the valve during operation; and when a power outage or circuit failure occurs, the valve cannot be controlled at all; if manual control is added, the two valve cores must be linked together, which has a complex structure and is not conducive to use. Summary of the invention

[0005] Based on this, it is necessary to provide a reversing valve to address the above problems, which utilizes the coordinated rotation of the left valve core, the right valve core and the distribution plate to change the direction of the oil circuit, so that the overall size of the reversing valve is compact, the flow channel structure is simplified, and the processing difficulty and manufacturing cost are reduced.

[0006] The present invention discloses a reversing valve, comprising: a valve body, on which an A port, a P port, a T port and a B port are provided, both ends of the valve body are fixedly connected to valve covers, and both valve covers are fixedly connected to motors; a distribution plate, which is arranged in the center of the valve body, and the side of the distribution plate is provided with a first annular groove connected to the P port and a second annular groove connected to the T port, the left side of the distribution plate is provided with a first triangular groove and a second triangular groove, and the right side of the distribution plate is provided with a third triangular groove and a fourth triangular groove, a first flow channel is connected between the first triangular groove and the fourth triangular groove, and the first flow channel is connected to the second annular groove, and the third triangular groove A second flow channel is connected to the first annular groove, and a third flow channel is connected between the second triangular groove and the first annular groove; a left valve core is rotatably connected to the interior of the valve body and contacts the left end surface of the distribution disk, and a side surface of the left valve core is provided with a third annular groove connected to the A port, and the third annular groove is connected to a fourth flow channel for connecting to the first triangular groove or the second triangular groove; a right valve core is rotatably connected to the interior of the valve body and contacts the right end surface of the distribution disk, and a side surface of the right valve core is provided with a fourth annular groove connected to the B port, and the fourth annular groove is connected to a fifth flow channel for connecting to the third triangular groove or the fourth triangular groove.

[0007] In one embodiment, the valve cover is divided into a left valve cover and a right valve cover, and the motor is divided into a first motor fixedly connected to the left valve cover and a second motor fixedly connected to the right valve cover.

[0008] In one embodiment, the center of the left end surface of the left valve core protrudes outward to form a left convex column, the output end of the first motor is fixedly connected to the center of the left convex column, the left valve cover is sleeved on the outside of the left convex column and is rotatably connected to the left convex column, a left limiting mechanism is installed between the left convex column and the left valve cover, the left limiting mechanism includes a left gear fixedly connected to the outside of the left convex column and a left sliding groove arranged in the left valve cover, a left piston is slidably connected in the left sliding groove, a left rack meshing with the left gear is arranged on the left piston, and a first spring is installed between both ends of the left piston and the two inner walls of the left sliding groove.

[0009] In one of the embodiments, the center of the right end surface of the right valve core protrudes outward to form a right convex column, the output end of the second motor is fixedly connected to the center of the right convex column, the right valve cover is sleeved on the outside of the right convex column and is rotatably connected to the right convex column, a right limiting mechanism is installed between the right convex column and the right valve cover, the right limiting mechanism includes a right gear fixedly connected to the outside of the right convex column and a right sliding groove arranged in the right valve cover, a right piston is slidably connected in the right sliding groove, a right rack meshing with the right gear is arranged on the right piston, and a second spring is installed between both ends of the right piston and the two inner walls of the right sliding groove.

[0010] In one of the embodiments, the distribution disk is rotatably connected to the valve body, and a reversing groove is provided on the valve body. A handle passing through the reversing groove is fixedly connected to the side of the distribution disk, and the distribution disk and the valve body can be driven to rotate relative to each other by rotating the handle.

[0011] In one of the embodiments, a positioning mechanism for limiting the rotation of the distribution disk is provided between the distribution disk and the valve body.

[0012] In one embodiment, the positioning mechanism includes a positioning groove arranged on the distribution plate, a mounting groove arranged on the inner wall of the valve body, a steel ball slidably connected to the mounting groove, and a positioning spring arranged in the mounting groove and used to push the steel ball to be inserted into the positioning groove.

[0013] In one embodiment, the commutation groove is in a semicircular ring shape.

[0014] In one of the embodiments, the side surfaces of the distribution plate, the left valve core and the right valve core are fixedly connected with a plurality of sealing rings.

[0015] Beneficial effects of the present invention:

[0016] 1. The present invention uses a flat seal to match the left valve core and the distribution plate, as well as the right valve core and the distribution plate together, and then the rotation of the left valve core and the right valve core can be used to change the direction of the oil circuit, so that the overall volume of the reversing valve is compact, and the various flow channels on the left valve core, the distribution plate and the right valve core are simplified, thereby reducing the processing difficulty and manufacturing cost.

[0017] 2. The present invention utilizes two motors to control the rotation angles of the left valve core and the right valve core respectively, so that the flow or pressure of the working oil port can be independently controlled, thereby better meeting the actual needs of different working conditions and being flexible and versatile.

[0018] 3. When the power is off, the present invention uses a handle to overcome the positioning mechanism to drive the distribution plate to rotate, and uses the gear rack cooperation method and the first spring to position the left valve core and uses the gear rack cooperation method and the second spring to position the right valve core, so that the distribution plate rotates while the left valve core and the right valve core do not move, to change the oil circuit direction of the reversing valve, thereby realizing manual control. When the power is on, the distribution plate is positioned and does not move, and the motor is used to drive the left valve core to overcome the first spring and the right valve core to overcome the second spring. The two modes do not affect each other, and dual control is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of the present invention;

[0020] Figure 2 For the present invention Figure 1 Sectional view in the AA direction;

[0021] Figure 3 For the present invention Figure 1 Cross-sectional view in the BB direction;

[0022] Figure 4 For the present invention Figure 1 Cross-sectional view in CC direction;

[0023] Figure 5 For the present invention Figure 1 Cross-sectional view in the middle DD direction;

[0024] Figure 6 For the present invention Figure 1 Cross-sectional view in the EE direction;

[0025] Figure 7 For the present invention Figure 1 Cross-sectional view in the FF direction.

[0026] In the figure, valve body 1, left valve core 2, fourth flow channel 21, third annular groove 22, right valve core 3, fifth flow channel 31, fourth annular groove 32, distribution plate 4, first flow channel 401, second flow channel 402, third flow channel 403, first annular groove 404, second annular groove 405, first triangular groove 406, second triangular groove 407, third triangular groove 408, fourth triangular groove 409, positioning groove 410, left valve cover 51, right valve cover 52, left piston 61, left rack 611, right piston 62, right rack 621, first motor 71, second motor 72, handle 8, steel ball 9, positioning spring 10, left gear 111, right gear 112, first spring 121, second spring 122. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0030] like Figure 1 , Figure 3 , Figure 4 , Figure 7As shown, a reversing valve comprises: a valve body 1, on which an A port, a P port, a T port and a B port are provided, both ends of the valve body 1 are fixedly connected to valve covers, and both valve covers are fixedly connected to motors; a distribution plate 4 is arranged in the center of the valve body 1, and the side of the distribution plate 4 is provided with a first annular groove 404 communicating with the P port and a second annular groove 405 communicating with the T port, the left side of the distribution plate 4 is provided with a first triangular groove 406 and a second triangular groove 407, and the right side of the distribution plate 4 is provided with a third triangular groove 408 and a fourth triangular groove 409, a first flow channel 401 is connected between the first triangular groove 406 and the fourth triangular groove 409, and the first flow channel 401 is connected to the second annular groove 405, and the third triangular groove 408 is connected to the A second flow channel 402 is connected between the first annular grooves 404, and a third flow channel 403 is connected between the second triangular groove 407 and the first annular groove 404; a left valve core 2 is rotatably connected to the interior of the valve body 1 and contacts the left end surface of the distribution disk 4, and a side surface of the left valve core 2 is provided with a third annular groove 22 connected to the A port, and the third annular groove 22 is connected to a fourth flow channel 21 for connecting to the first triangular groove 406 or the second triangular groove 407; a right valve core 3 is rotatably connected to the interior of the valve body 1 and contacts the right end surface of the distribution disk 4, and a side surface of the right valve core 3 is provided with a fourth annular groove 32 connected to the B port, and the fourth annular groove 32 is connected to a fifth flow channel 31 for connecting to the third triangular groove 408 or the fourth triangular groove 409.

[0031] It is understandable that if Figure 1 As shown, the left valve core 2 and the right valve core 3 are both disc-shaped.

[0032] Preferably, Figure 1 As shown, the valve cover is divided into a left valve cover 51 and a right valve cover 52 , and the motor is divided into a first motor 71 fixedly connected to the left valve cover 51 and a second motor 72 fixedly connected to the right valve cover 52 .

[0033] It is worth mentioning that Figure 1 As shown, both the first motor 71 and the second motor 72 are stepper motors.

[0034] Preferably, Figure 1 , Figure 6As shown, the center of the left end surface of the left valve core 2 protrudes outward to form a left convex column, the output end of the first motor 71 is fixedly connected to the center of the left convex column, the left valve cover 51 is sleeved on the outside of the left convex column and is rotatably connected to the left convex column, and a left limiting mechanism is installed between the left convex column and the left valve cover 51, and the left limiting mechanism includes a left gear 111 fixedly connected to the outside of the left convex column and a left sliding groove arranged in the left valve cover 51, a left piston 61 is slidably connected in the left sliding groove, and a left rack 611 meshing with the left gear 111 is arranged on the left piston 61, and a first spring 121 is installed between both ends of the left piston 61 and the two inner walls of the left sliding groove.

[0035] It is worth mentioning that Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, when the first motor 71 drives the left valve core 2 to rotate clockwise, it can drive the left gear 111 to rotate clockwise, and then drive the left piston 61 through the left rack 611 to overcome the first spring 121 and move to the right, so that the fourth flow channel 21 and the second triangular groove 407 are connected, so that the P port, the first annular groove 404, the third flow channel 403, the second triangular groove 407, the fourth flow channel 21, the third annular groove 22 and the A port are connected; when the first motor 71 drives the left valve core 2 to rotate counterclockwise, it can drive the left gear 111 to rotate counterclockwise, and then drive the left piston 61 through the left rack 611 to overcome the first spring 121 and move to the left, so that the fourth flow channel 21 and the first triangular groove 406 are connected, so that the A port, the third annular groove 22, the fourth flow channel 21, the first triangular groove 406, the first flow channel 401, the second annular groove 405 and the T port are connected.

[0036] It is understandable that if Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 As shown, when the left piston 61 moves to the rightmost end, the communication area between the fourth flow channel 21 and the second triangular groove 407 is the largest; and when the left piston 61 moves to the leftmost end, the communication area between the fourth flow channel 21 and the first triangular groove 406 is the largest, that is, by controlling the rotation angle of the left valve core 2 by the first motor 71, the communication area can be adjusted, and then the pressure and flow of the working oil port can be independently controlled.

[0037] It is worth mentioning that Figure 6 As shown, when the left piston 61 is located at the middle position of the left sliding groove, the two first springs 121 both exert a force on the left piston 61, and the forces are the same.

[0038] Preferably, Figure 1, Figure 5 As shown, the center of the right end surface of the right valve core 3 protrudes outward to form a right convex column, the output end of the second motor 72 is fixedly connected to the center of the right convex column, the right valve cover 52 is sleeved on the outside of the right convex column and is rotatably connected to the right convex column, and a right limiting mechanism is installed between the right convex column and the right valve cover 52, the right limiting mechanism includes a right gear 112 fixedly connected to the outside of the right convex column and a right sliding groove arranged in the right valve cover 52, a right piston 62 is slidably connected in the right sliding groove, a right rack 621 meshing with the right gear 112 is arranged on the right piston 62, and a second spring 122 is installed between both ends of the right piston 62 and the two inner walls of the right sliding groove.

[0039] It is worth mentioning that Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 As shown, when the second motor 72 drives the right valve core 3 to rotate clockwise, it can drive the right gear 112 to rotate clockwise, and then drive the right piston 62 through the right rack 621 to overcome the second spring 122 and move to the right, so that the fifth flow channel 31 and the fourth triangular groove 409 are connected, so that the B port, the fourth annular groove 32, the fifth flow channel 31, the fourth triangular groove 409, the first flow channel 401, the second annular groove 405, and the T port are connected; when the second motor 72 drives the right valve core 3 to rotate counterclockwise, it can drive the right gear 112 to rotate counterclockwise, and then drive the right piston 62 through the right rack 621 to overcome the second spring 122 and move to the left, so that the fifth flow channel 31 and the third triangular groove 408 are connected, so that the P port, the first annular groove 404, the second flow channel 402, the third triangular groove 408, the fifth flow channel 31, the fourth annular groove 32, and the B port are connected.

[0040] It is understandable that if Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 As shown, when the right piston 62 moves to the rightmost end, the communication area between the fifth flow channel 31 and the fourth triangular groove 409 is the largest; and when the right piston 62 moves to the leftmost end, the communication area between the fifth flow channel 31 and the third triangular groove 408 is the largest, that is, by controlling the rotation angle of the right valve core 3 by the second motor 72, the communication area can be adjusted, and then the pressure and flow of the working oil port can be independently controlled.

[0041] It is worth mentioning that Figure 5 As shown, when the right piston 62 is located at the middle position of the right sliding groove, the two second springs 122 both exert a force on the right piston 62, and the forces are the same.

[0042] Preferably, Figure 1 , Figure 2 As shown, the distribution disc 4 is rotatably connected to the valve body 1, and a reversing groove is provided on the valve body 1. A handle 8 passing through the reversing groove is fixedly connected to the side of the distribution disc 4, and the distribution disc 4 and the valve body 1 can be driven to rotate relative to each other by rotating the handle 8.

[0043] Preferably, Figure 1 , Figure 2 As shown, a positioning mechanism for limiting the rotation of the distribution disc 4 is provided between the distribution disc 4 and the valve body 1 to prevent the distribution disc 4 from rotating unexpectedly and affecting the normal operation of the reversing valve.

[0044] Preferably, Figure 2 As shown, the positioning mechanism includes a positioning groove 410 arranged on the distribution plate 4, a mounting groove arranged on the inner wall of the valve body 1, a steel ball 9 slidably connected to the mounting groove, and a positioning spring 10 arranged in the mounting groove and used to push the steel ball 9 to be inserted into the positioning groove 410.

[0045] Preferably, Figure 2 As shown, the reversing groove is in a semicircular shape, which can limit the rotation range of the handle 8.

[0046] It is worth mentioning that Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 As shown, when the handle 8 rotates counterclockwise, it can drive the distribution disk 4 to rotate counterclockwise, thereby driving the second triangular groove 407 and the fourth flow channel 21 as well as the fifth flow channel 31 and the fourth triangular groove 409 to be connected. When the handle 8 rotates clockwise, it can drive the distribution disk 4 to rotate clockwise, thereby driving the fourth flow channel 21 and the first triangular groove 406 to be connected as well as the fifth flow channel 31 and the third triangular groove 408 to be connected.

[0047] It is understandable that if Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 As shown, when the handle 8 is rotated counterclockwise to the side wall of the reversing groove, the communication area between the second triangular groove 407 and the fourth flow channel 21 and between the fifth flow channel 31 and the fourth triangular groove 409 is the largest; when the handle 8 is rotated clockwise to the other side wall of the reversing groove, the communication area between the fourth flow channel 21 and the first triangular groove 406 and between the fifth flow channel 31 and the third triangular groove 408 is the largest.

[0048] Preferably, Figure 1As shown, the sides of the distribution plate 4, the left valve core 2 and the right valve core 3 are fixedly connected with a plurality of sealing rings to provide sealing.

[0049] Working principle of the present invention:

[0050] Before the reversing valve works, connect the reversing valve to the oil circuit. The reversing valve has two states: working with power on and working without power off.

[0051] When there is electricity normally, the reversing valve works with electricity. When hydraulic oil needs to flow from port P into port A and out of port B, first use the handle 8 to adjust the position of the distribution plate 4. That is, at this time, the steel ball 9 is pushed to be stuck in the positioning groove 410 under the action of the positioning spring 10, so that the distribution plate 4 remains stationary during the electric control operation, and the first motor 71 is started to drive the left valve core 2 to rotate clockwise, so that the left gear 111 rotates synchronously with the left valve core 2, and then the left piston 61 is driven by the left rack 611 to overcome the first spring 121 and move to the right, so that the fourth flow channel 21 is connected to the second triangular groove 407. When the first motor 71 is started, the second motor 72 is also started, and the second electric The machine 72 drives the right valve core 3 to rotate clockwise, so that the right gear 112 rotates synchronously with the right valve core 3, and then drives the right piston 62 through the right rack 621 to overcome the second spring 122 and move to the right, so that the fifth flow channel 31 and the fourth triangular groove 409 are connected. At this time, the hydraulic oil enters from the P port, passes through the first annular groove 404, the third flow channel 403, the second triangular groove 407, the fourth flow channel 21, and the third annular groove 22, and then flows out from the A port into the working element, while the hydraulic oil in the working element enters the B port through the oil circuit, passes through the fourth annular groove 32, the fifth flow channel 31, the fourth triangular groove 409, the first flow channel 401, and the second annular groove 405, and then flows out from the T port.

[0052] When hydraulic oil is required to flow from port P into port B and out from port A, and flow into port T, similarly, the positioning spring 10 pushes the steel ball 9 to fit into the positioning groove 410, so that the distribution plate 4 remains stationary during the electronic control operation, and the first motor 71 is started to drive the left valve core 2 to rotate counterclockwise, so that the left gear 111 rotates synchronously with the left valve core 2, and then the left piston 61 is driven to move to the left through the left rack 611 to overcome the first spring 121, so that the fourth flow channel 21 is connected to the first triangular groove 406. When the first motor 71 is started, the second motor 71 is also started, and the second motor 72 also drives the right valve core 3 to rotate counterclockwise. The right gear 112 rotates synchronously with the right valve core 3, and then drives the right piston 62 to move to the left through the right rack 621 to overcome the second spring 122, so that the fifth channel 31 and the third triangular groove 408 are connected. At this time, the hydraulic oil enters the P port, passes through the first annular groove 404, the second channel 402, the third triangular groove 408, the fifth channel 31, and the fourth annular groove 32, and then flows out from the B port into the working element, while the hydraulic oil in the working element enters the A port through the oil circuit, passes through the third annular groove 22, the fourth channel 21, the first triangular groove 406, the first channel 401, and the second annular groove 405, and then flows out from the T port.

[0053] When a power outage occurs, the reversing valve loses power and works. Under the action of the first spring 121 and the second spring 122, the left piston 61 and the right piston 62 are pushed to the middle position of the left sliding groove and the right sliding groove respectively, that is, the left valve core 2 and the right valve core 3 are positioned as shown in FIG. Figure 1 The position shown, at this time, the positioning spring 10 pushes the steel ball 9 into the positioning groove 410, so that the reversing valve remains in a completely closed state at ports A, B, P, and T. The handle 8 is turned clockwise to drive the distribution plate 4 to overcome the positioning of the positioning spring 10 and rotate clockwise, thereby driving the fourth flow channel 21 to be connected with the first triangular groove 406 and the fifth flow channel 31 to be connected with the third triangular groove 408. At this time, the reversing valve is controlled to complete the working state in which the hydraulic oil flows from port P into port B and flows out from port A, and flows into port T and flows out; the handle 8 is turned counterclockwise to drive the distribution plate 4 to overcome the positioning of the positioning spring 10 and rotate counterclockwise, thereby driving the second triangular groove 407 and the fourth flow channel 21 as well as the fifth flow channel 31 and the fourth triangular groove 409 to be connected, and the reversing valve is controlled to complete the working state in which the hydraulic oil flows from port P into port A and flows out, and flows into port B and flows out, thereby completing manual control.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A reversing valve, characterized in that: include: A valve body, wherein the valve body is provided with an A port, a P port, a T port and a B port, both ends of the valve body are fixedly connected to valve covers, and both valve covers are fixedly connected to motors; A distribution plate is arranged in the center of the valve body, a first annular groove communicating with the P port and a second annular groove communicating with the T port are arranged on the side of the distribution plate, a first triangular groove and a second triangular groove are arranged on the left side of the distribution plate, and a third triangular groove and a fourth triangular groove are arranged on the right side of the distribution plate, a first flow channel is connected between the first triangular groove and the fourth triangular groove, and the first flow channel is connected with the second annular groove, a second flow channel is connected between the third triangular groove and the first annular groove, and a third flow channel is connected between the second triangular groove and the first annular groove; A left valve core is rotatably connected to the inside of the valve body and contacts the left end surface of the distribution plate, and a third annular groove communicating with the A port is provided on the side surface of the left valve core, and the third annular groove is connected with a fourth flow channel for communicating with the first triangular groove or the second triangular groove; a right valve core, rotatably connected to the inside of the valve body and in contact with the right end surface of the distribution plate, wherein a side surface of the right valve core is provided with a fourth annular groove communicating with the B port, and the fourth annular groove is connected with a fifth flow channel for communicating with the third triangular groove or the fourth triangular groove; The distribution disc is rotatably connected to the valve body, and a reversing groove is provided on the valve body. A handle passing through the reversing groove is fixedly connected to the side of the distribution disc, and the distribution disc and the valve body can be driven to rotate relative to each other by rotating the handle.

2. The reversing valve according to claim 1, characterized in that: The valve cover is divided into a left valve cover and a right valve cover, and the motor is divided into a first motor fixedly connected to the left valve cover and a second motor fixedly connected to the right valve cover.

3. The reversing valve according to claim 2, characterized in that: The center of the left end surface of the left valve core protrudes outward to form a left convex column, the output end of the first motor is fixedly connected to the center of the left convex column, the left valve cover is sleeved on the outside of the left convex column and is rotatably connected to the left convex column, a left limiting mechanism is installed between the left convex column and the left valve cover, the left limiting mechanism includes a left gear fixedly connected to the outside of the left convex column and a left sliding groove arranged in the left valve cover, a left piston is slidably connected in the left sliding groove, a left rack meshing with the left gear is arranged on the left piston, and a first spring is installed between both ends of the left piston and the two inner walls of the left sliding groove.

4. The reversing valve according to claim 2, characterized in that: The center of the right end surface of the right valve core protrudes outward to form a right convex column, the output end of the second motor is fixedly connected to the center of the right convex column, the right valve cover is sleeved on the outside of the right convex column and is rotatably connected to the right convex column, a right limiting mechanism is installed between the right convex column and the right valve cover, the right limiting mechanism includes a right gear fixedly connected to the outside of the right convex column and a right sliding groove arranged in the right valve cover, a right piston is slidably connected in the right sliding groove, a right rack meshing with the right gear is arranged on the right piston, and a second spring is installed between both ends of the right piston and the two inner walls of the right sliding groove.

5. The reversing valve according to claim 1, characterized in that: A positioning mechanism for limiting the rotation of the distribution disc is arranged between the distribution disc and the valve body.

6. The reversing valve according to claim 5, characterized in that: The positioning mechanism includes a positioning groove arranged on the distribution plate, a mounting groove arranged on the inner wall of the valve body, a steel ball slidably connected to the mounting groove, and a positioning spring arranged in the mounting groove and used to push the steel ball to be inserted into the positioning groove.

7. The reversing valve according to claim 6, characterized in that: The commutation groove is in a semicircular ring shape.

8. The reversing valve according to claim 1, characterized in that: The side surfaces of the distribution plate, the left valve core and the right valve core are all fixedly connected with a plurality of sealing rings.

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