Reversing valve

Abstract

The utility model relates to the technical field of valves, and particularly discloses a reversing valve. The reversing valve comprises a valve head assembly, a reversing assembly and a driving assembly, and the driving assembly drives the reversing assembly to rotate and switch between a first conduction position and a second conduction position. When the reversing assembly is located at the first conduction position, the first communication groove is only communicated with the discharging port and a feeding port in a sealed mode. When the reversing assembly is located at the second conduction position, the first communication groove is only communicated with the discharging port and the other feeding port in a sealed mode. When the reversing assembly is located between the first communicating position and the second communicating position, part of each feeding port and the discharging port communicate with the first communicating groove in a sealed mode. When the reversing assembly is located between the first communicating position and the second communicating position, the part of each feeding opening and the discharging opening communicate with the first communicating groove in a sealed mode, therefore, in the process of switching the communicating positions, the two discharging channels are in the partially open state, and the risk that the pressure of a pipeline is suddenly increased due to instant cutoff is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a reversing valve. Background Art

[0002] The three-way valve has the characteristics of flow channel switching, fast opening and closing, small flow resistance and compact structure. It is widely used in industries, construction, sewage treatment and energy, and plays an important role. As the existing three-way valves have blind ends, materials are easily bred at the blind ends. Therefore, in actual production, small-sized reversing valves without blind ends are often used to replace three-way valves, thus avoiding the defect of bacteria breeding at the blind ends.

[0003] However, the existing reversing valve is a high-pressure switching valve. During the process of switching the conducting direction of the feed channel and the two discharge channels, there will be a period of time when the feed channel and the two discharge channels are not conducting, resulting in an instantaneous interruption of the material flow, which leads to an instantaneous increase in the pressure in the pipeline. The instantaneous increase in the pressure in the pipeline will, on the one hand, cause the pressure of the pump in the pipeline to surge instantly, affecting the service life of the pump. On the other hand, since the interface with the reversing valve generally adopts a polyetheretherketone (PEEK) interface and PEEK pipeline that is easy to replace, the instantaneous pressure surge will easily stretch the PEEK joint, thus affecting its service life. Utility Model Content

[0004] The utility model aims to provide a reversing valve to solve the problem in the prior art that when the reversing valve switches direction, high pressure is generated due to instantaneous flow interruption, which affects the service life of the pump and the pipeline joint, improves the pressure consistency and stability when the reversing valve switches direction, and prolongs the service life of the pump and the pipeline joint.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A reversing valve, comprising:

[0007] A valve head assembly, wherein the valve head assembly is provided with a feed channel and two discharge channels, and the discharge port of the feed channel and the feed ports of the two discharge channels are both provided on a first working surface of the valve head assembly;

[0008] The reversing assembly comprises a second working surface, the second working surface is rotatably fitted with the first working surface, and the second working surface is provided with a first communicating groove;

[0009] A driving component, wherein the driving component drives the reversing component to rotate and switch between a first conducting position and a second conducting position;

[0010] When the commutation component is in the first conduction position, the first communication groove is only in sealed communication with the discharge port and one of the feed ports; when the commutation component is in the second conduction position, the first communication groove is only in sealed communication with the discharge port and the other feed port; when the commutation component is between the first conduction position and the second conduction position, a part of each feed port and the discharge port are in sealed communication with the first communication groove.

[0011] Optionally, the commutation valve further includes a fixed seat having an installation inner cavity. The valve head assembly is installed at the first end of the fixed seat. The commutation component is rotatably installed in the installation inner cavity, and the driving component is located on the side of the fixed seat away from the valve head assembly.

[0012] Optionally, the valve head assembly includes a valve head and a sealing seat. The valve head is installed outside one end of the fixed seat. The sealing seat is located in the installation inner cavity and is clamped between the valve head and the commutation component. A first working surface is formed on one side of the sealing seat facing the commutation component;

[0013] The feed channel extends from the outer side wall of the valve head to the first working surface, and the discharge channel extends from the outer side wall of the valve head to the first working surface.

[0014] Optionally, at least two first positioning posts are provided on one of the valve head and the sealing seat, and at least two first positioning holes are provided on the other of the valve head and the sealing seat. The first positioning posts and the first positioning holes are arranged in one-to-one correspondence, and the first positioning posts are inserted into the corresponding first positioning holes.

[0015] Optionally, the commutation component includes a commutation plate and a rotating shaft. One side of the commutation plate is rotatably attached to the first working surface and is provided with the first communication groove. The other opposite side of the commutation plate is detachably connected to one end of the rotating shaft. The rotating shaft is rotatably matched with the fixed seat, and the other end of the rotating shaft is connected to the driving component.

[0016] Optionally, a boss portion protrudes from the side of the commutation plate facing the valve head assembly. The surface of the boss portion is rotatably attached to the first working surface. The first communication groove is provided on the boss portion, and a groove separated from the first communication groove is provided on the surface of the boss portion.

[0017] Optionally, at least two second positioning posts are provided on one of the commutation plate and the rotating shaft, and at least two second positioning holes are provided on the other of the commutation plate and the rotating shaft. The second positioning posts and the second positioning holes are arranged in one-to-one correspondence, and the second positioning posts are inserted into the corresponding second positioning holes.

[0018] Optionally, the rotating shaft includes a rotating head and a rotating rod connected to each other. The rotating head is rotatably installed in the installation inner cavity, and the diameter of the rotating head is larger than that of the rotating rod. One side of the rotating head away from the rotating rod is detachably connected to the commutation plate. The driving assembly is installed outside the fixed seat, and the rotating rod passes through the fixed seat and is connected to the driving assembly.

[0019] Optionally, the commutation valve further includes a rotating shaft sealing ring, which is sleeved on the outer periphery of the rotating head and clamped between the rotating head and the fixed seat;

[0020] And / or, the commutation valve further includes a washer, which is sleeved on the outer side of the rotating rod, and the washer is clamped between the end face of the rotating head and the bottom of the installation inner cavity.

[0021] Optionally, the first communication groove has an arc-shaped structure, and the center of the arc-shaped structure is located on the rotation axis of the commutation assembly;

[0022] The discharge port and the two feed ports are arranged at intervals around the rotation axis, and the two feed ports are respectively located on both sides of the discharge port.

[0023] Optionally, the second working surface is further provided with a second communication groove. The second communication groove and the first communication groove are arranged at intervals along the rotation direction of the commutation assembly. The driving assembly can drive the commutation assembly to rotate to a position where the discharge port and the two feed ports are both communicated with the second communication groove.

[0024] Beneficial effects:

[0025] A commutation valve provided by the present utility model drives a commutation assembly to rotate through a driving assembly, so that the commutation assembly rotates and switches between two conduction positions. When the commutation assembly is in the first conduction position, the first communication groove is only hermetically communicated with the discharge port and one feed port; when the commutation assembly is in the second conduction position, the first communication groove is only hermetically communicated with the discharge port and the other feed port, so as to selectively communicate the feed channel and any one of the discharge channels. And when the commutation assembly is between the first conduction position and the second conduction position, a part of each feed port and the discharge port are hermetically communicated with the first communication groove. Therefore, during the process of switching the conduction position, both discharge channels are in a partially open state, and there is no risk of sudden increase in pipeline pressure caused by instantaneous interruption of flow, thereby making the pipeline pressure change less and extending the service life of the pump and pipeline interfaces. Description of the Drawings

[0026] Figure 1 is a cross-sectional view of a commutation valve provided by an embodiment of the present utility model in an assembled state;

[0027] Figure 2It is an exploded view of a reversing valve provided by an embodiment of the present utility model;

[0028] Figure 3 It is a schematic structural view of the valve head of a reversing valve provided by an embodiment of the present utility model;

[0029] Figure 4 It is a schematic structural view of the main feed channel and two main discharge channels of a reversing valve provided by an embodiment of the present utility model;

[0030] Figure 5 It is a schematic structural view of the valve head of a reversing valve from another perspective provided by an embodiment of the present utility model;

[0031] Figure 6 It is a schematic structural view of the sealing seat of a reversing valve provided by an embodiment of the present utility model;

[0032] Figure 7 It is a schematic structural view of the reversing plate of a reversing valve provided by an embodiment of the present utility model;

[0033] Figure 8 It is a schematic structural view of the reversing rotating shaft of a reversing valve provided by an embodiment of the present utility model.

[0034] In the figure:

[0035] 1. Valve head assembly;

[0036] 11. Valve head; 111. Main feed channel; 112. Main discharge channel;

[0037] 12. Sealing seat; 121. Feed connection channel; 1211. Discharge port; 122. Discharge connection channel; 1221. Feed port; 123. First positioning hole; 13. First positioning post;

[0038] 2. Reversing assembly;

[0039] 21. Reversing plate; 211. First connection groove; 212. Second connection groove; 213. Second positioning hole; 214. Boss portion;

[0040] 22. Rotating shaft; 221. Second positioning post; 222. Rotating head; 223. Rotating rod;

[0041] 3. Rotating shaft sealing ring;

[0042] 4. Washer;

[0043] 5. Fixed seat. Detailed implementation manners

[0044] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present utility model clearer, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model and not for limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model are shown in the drawings rather than all of them.

[0045] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0047] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0048] This embodiment provides a reversing valve to solve the problem in the prior art that when the reversing valve switches directions, high pressure is generated due to instantaneous interruption of the flow, which affects the service life of the pump and the pipe joint.

[0049] As Figures 1 - 8As shown in the figure, a reversing valve provided in this embodiment includes a valve head assembly 1, a reversing assembly 2, and a driving assembly. Among them, the valve head assembly 1 is provided with one feed channel and two discharge channels (it should be noted that each of the feed channel and the discharge channels is provided with a feed port and a discharge port). The discharge port 1211 of the feed channel and the feed ports 1221 of the two discharge channels are all opened on the first working surface of the valve head assembly 1. The reversing assembly 2 has a second working surface, and the second working surface is rotationally and fittingly arranged with the first working surface. The second working surface is provided with a first communication groove 211. One side of the reversing assembly 2 away from the first working surface is connected to the driving assembly. Optionally, the end of one side of the reversing assembly 2 away from the first working surface is connected to the driving assembly. In other embodiments, the driving assembly can also be circumferentially sleeved on one side of the reversing assembly 2 away from the first working surface, as long as it can ensure that the driving assembly drives the reversing assembly 2 to rotate, which is not limited herein. As the reversing assembly 2 rotates, the discharge port 1211 and the two feed ports 1221 are selectively communicated through the first communication groove 211, thereby facilitating the selective communication between the feed channel and the two discharge channels, that is, enabling the feed channel of the valve head assembly 1 to switch from a state of being communicated with one discharge channel through the first communication groove 211 to a state of being communicated with the other discharge channel through the first communication groove 211, so that the reversing valve has the function of selectively communicating the material channels, that is, the reversing function.

[0050] Optionally, the discharge port 1211 is always kept in communication with the first communication groove 211. As the reversing assembly 2 rotates, there are different communication states between the first communication groove 211 and the two feed ports 1221: the first communication groove 211 is completely communicated with one of the feed ports 1221 and completely disconnected from the other feed port 1221; or the first communication groove 211 is partially communicated with both feed ports 1221 at the same time.

[0051] That is to say, the driving assembly can drive the reversing assembly 2 to rotate and switch between the first conduction position and the second conduction position. When the reversing assembly 2 is in the first conduction position, the first communication groove 211 is hermetically communicated with the discharge port 1211 and one of the feed ports 1221, so that the feed channel is hermetically communicated with one discharge channel; when the reversing assembly 2 is in the second conduction position, the first communication groove 211 is hermetically communicated with the discharge port 1211 and the other feed port 1221, so that the feed channel is hermetically communicated with the other discharge channel; when the reversing assembly 2 is between the first conduction position and the second conduction position, a part of each feed port 1221 and the discharge port 1211 are hermetically communicated with the first communication groove 211, so that a part of the two discharge channels are both communicated with the feed channel.

[0052] That is, the directional valve provided in this embodiment can selectively connect the discharge port 1211 to any one of the feed ports 1221 through the above three connection modes of the first communication groove 211 with the discharge port 1211 and the feed ports 1221. This not only realizes the reversal of the material channel, but also enables the discharge port 1211 to be partially connected to the feed port 1221 simultaneously during the reversal process, so that there is no interruption phenomenon where the material channels are not conducting during the reversal process, avoiding the risk of a sharp increase in pipeline pressure caused by this phenomenon, and further avoiding damage to the pumps and interfaces in the pipeline due to the sharp increase in pipeline pressure, thereby extending the service life of the pipeline pumps and interfaces.

[0053] As Figure 1 shown, optionally, the directional valve further includes a fixed seat 5, and the fixed seat 5 has an installation inner cavity. The valve head assembly 1 is installed at the first end of the fixed seat 5, facilitating the connection of external pipelines to the feed channel and the discharge channel. The reversing assembly 2 is rotatably installed in the installation inner cavity. The reversing assembly 2 needs to rotate to switch between the above two conducting positions to realize the reversal of the material channel. Rotatably installing the reversing assembly 2 in the installation inner cavity can limit and position its rotation by the installation inner cavity, improving the stability of rotation; the driving assembly is located on the side of the fixed seat 5 away from the valve head assembly 1 to avoid interference between the driving assembly and the valve head assembly 1, improving the layout rationality and structural compactness of the components in the directional valve, and facilitating the connection between the driving assembly and the reversing assembly 2.

[0054] Furthermore, the driving assembly is located outside the fixed seat 5. The driving assembly is the power source for driving the rotation of the reversing assembly 2. Setting the driving assembly outside the fixed seat 5 can save the space of the installation inner cavity, thereby reducing the volume of the fixed seat 5 and improving the space utilization rate.

[0055] Optionally, as Figures 1 to 6 shown, the valve head assembly 1 includes a valve head 11 and a sealing seat 12. The valve head 11 is installed on the outer side of one end of the fixed seat 5. The sealing seat 12 is located inside the installation inner cavity and is clamped between the valve head 11 and the reversing assembly 2. One side surface of the sealing seat 12 facing the reversing assembly 2 forms a first working surface. The feed channel extends from the outer side wall of the valve head 11 to the first working surface, and the discharge channel extends from the outer side wall of the valve head 11 to the first working surface.

[0056] Installing the valve head 11 on the outer side of one end of the fixed seat 5 facilitates the connection of the openings on the outer side wall of the valve head 11 to the pipeline, and also facilitates the disassembly and assembly of the valve head assembly 1 and the fixed seat 5, thereby improving the disassembly and assembly efficiency of the directional valve; the sealing seat 12 is located inside the installation inner cavity and is clamped between the valve head 11 and the reversing assembly 2, facilitating the rotational cooperation between the sealing seat 12 and the reversing assembly 2, and effectively sealing the gap between the valve head 11 and the reversing assembly 2.

[0057] In other embodiments, the valve head assembly 1 may only include the valve head 11, that is, one side surface of the valve head 11 is the first working surface. One side surface of the reversing assembly 2 facing the valve head 11 is an elastic sealing surface, and a first communication groove 211 is formed on the sealing surface.

[0058] Specifically, the valve head 11 is provided with a main feed channel 111 and two main discharge channels 112, while the sealing seat 12 is provided with a feed communication channel 121 and two discharge communication channels 122; one end of the feed communication channel 121 penetrating through the first working surface forms a discharge port 1211, the other end of the feed communication channel 121 is communicated with the discharge end of the main feed channel 111, the feed end of the main feed channel 111 penetrates through the outer side wall of the valve head 11, and the main feed channel 111 and the feed communication channel 121 together form a feed channel. One end of each discharge communication channel 122 penetrating through the first working surface forms a feed port 1221, the other end of the discharge communication channel 122 is communicated with the feed end of the main discharge channel 112, the discharge end of the main discharge channel 112 penetrates through the outer side wall of the valve head 11, and the main discharge channel 112 and the discharge communication channel 122 together form a discharge channel.

[0059] As Figure 4 shown, the main feed channel 111 penetrates from the outer peripheral side wall of the valve head 11 into the interior of the valve head 11, first extends along the radial direction of the valve head 11 and then extends along the axial direction of the valve head 11 until it penetrates through the side of the valve head 11 facing the first working surface. The main discharge channel 112 penetrates from the outer peripheral side wall of the valve head 11 into the interior of the valve head 11, extends along the radial direction of the valve head 11 for a certain distance and then extends along the axial direction of the valve head 11 towards the direction of the first working surface until it penetrates through the side of the valve head 11 facing the first working surface. With the above settings, the feed end of the main feed channel 111 and the discharge ends of the two main discharge channels 112 can be distributed on the outer peripheral side wall of the valve head 11, which is convenient for the staff to connect external pipelines and reduces the interference between external pipelines; moreover, the main feed channel 111 and the two main discharge channels 112 both extend from the side wall of the valve head 11 to the side of the valve head 11 facing the first working surface, integrating the intersection ports of the main feed channel 111 and the main discharge channels 112 in different directions on one plane, which is convenient for selectively connecting the three through the communication groove, with a simple structure and low part manufacturing difficulty.

[0060] Optionally, at least two first positioning posts 13 are provided on one of the valve head 11 and the sealing seat 12, and at least two first positioning holes 123 are provided on the other of the valve head 11 and the sealing seat 12. The first positioning posts 13 and the first positioning holes 123 are arranged in one-to-one correspondence, and the first positioning posts 13 are inserted into the corresponding first positioning holes 123. The insertion positioning of at least two first positioning posts 13 and at least two first positioning holes 123 can prevent relative rotation between the valve head 11 and the sealing seat 12, thereby ensuring the smoothness of the material channel and preventing misalignment of the main channel and the communication channel due to relative rotation between the two, which may cause blockage of the material channel.

[0061] As Figure 1 , Figure 2 , Figure 7 and Figure 8 shown, optionally, the commutation assembly 2 includes a commutation plate 21 and a rotating shaft 22. One side of the commutation plate 21 is rotatably attached to the first working surface and is provided with a first communication groove 211. The other opposite side of the commutation plate 21 is detachably connected to one end of the rotating shaft 22. The rotating shaft 22 is rotatably engaged with the fixed seat 5, and the other end of the rotating shaft 22 is connected to the driving assembly. The first communication groove 211 needs to be frequently connected to different material channels, and the pressure change it bears is also relatively frequent. Moreover, when commuting, the commutation plate 21 rotates, and the side of the commutation plate 21 provided with the first communication groove 211 will frequently rub against the first working surface, resulting in easy wear of the commutation plate 21 after long-term friction. Therefore, the commutation plate 21 and the rotating shaft 22 are set to be detachably connected, which is convenient for timely replacement of the commutation plate 21; at the same time, it is also beneficial to reduce the processing difficulty and processing cost of the commutation assembly 2.

[0062] As Figure 7As shown, optionally, the first communication groove 211 has an arc structure, and the center of the circle corresponding to the arc structure is located on the rotation axis of the commutation component 2; the discharge port 1211 and the two feed ports 1221 are arranged at intervals around the rotation axis, and the two feed ports 1221 are respectively located on both sides of the discharge port 1211. The center of the circle corresponding to the first communication groove 211 with an arc structure is located on the rotation axis of the commutation component 2, which can enable the first communication groove 211 to be synchronously displaced as the commutation component 2 rotates, improving the accuracy of conducting the material channel. The discharge port 1211 and the two feed ports 1221 are arranged at intervals around the rotation axis, enabling the discharge port 1211 and the two feed ports 1221 to be on the same circumference, facilitating the conduction of the discharge port 1211 and the two feed ports 1221 through the rotation of the commutation component 2; the two feed ports 1221 are respectively located on both sides of the discharge port 1211, facilitating the commutation component 2 to switch the conduction between the discharge port 1211 and any one of the feed ports 1221 with a smaller movement stroke. At the same time, with this setting, when the commutation component 2 is between the first conduction position and the second conduction position, parts of the two feed ports 1221 are respectively connected to both ends of the first communication groove 211, which is conducive to realizing the setting that the first communication groove 211 is respectively connected to parts of the feed ports 1221.

[0063] In other embodiments, the first communication groove 211 may also be in other shapes such as rectangular or fan-shaped, as long as it is ensured that the first communication groove 211 can be synchronously displaced as the commutation component 2 rotates, and when the commutation component 2 is in the first conduction position, it is connected to the discharge port 1211 and one feed port 1221, and when the commutation component 2 is in the second conduction position, it is connected to the discharge port 1211 and the other feed port 1221. When the commutation component 2 is between the first conduction position and the second conduction position, it is connected to parts of each feed port 1221 and the discharge port 1211, and there is no limitation here.

[0064] Optionally, a second communication groove 212 is also provided on the second working surface. The second communication groove 212 and the first communication groove 211 are arranged at intervals along the rotation direction of the commutation component 2, and the driving component can drive the commutation component 2 to rotate until the discharge port 1211 and the two feed ports 1221 are both connected to the second communication groove 212. The second communication groove 212 and the first communication groove 211 are arranged at intervals along the rotation direction of the commutation component 2. The interval setting avoids the coincidence of the first communication groove 211 and the second communication groove 212, thereby avoiding the potential risk of commutation failure caused by the coincidence of the communication grooves; both the first communication groove 211 and the second communication groove 212 are arranged along the rotation direction of the commutation component 2, facilitating the switching between the first communication groove 211 and the second communication groove 212 according to requirements through the rotation of the same commutation component 2. The second communication groove 212 can be completely connected to the discharge port 1211 and the two feed ports 1221 at the same time, expanding the conduction function of the commutation valve and meeting the functional requirements of simultaneously conducting two discharge channels under special working conditions.

[0065] As Figure 7 shown, optionally, the second communication groove 212 has an arc-shaped structure, and the center of the circle corresponding to the arc-shaped structure is located on the rotation axis of the commutation assembly 2; the center of the circle corresponding to the second communication groove 212 having an arc-shaped structure is located on the rotation axis of the commutation assembly 2, which can enable the second communication groove 212 to be synchronously displaced as the commutation assembly 2 rotates, improving the accuracy of conducting the material channel. In addition, both the second communication groove 212 and the first communication groove 211 have an arc-shaped structure and are arranged at intervals along the rotation direction of the commutation assembly 2, so that the two communication grooves are located on the same circumference. When switching between the two communication grooves, the commutation assembly 2 can be rotated from any direction, simplifying the operation of switching different communication grooves.

[0066] In other embodiments, the second communication groove 212 may also have other shapes such as a rectangle or a sector, as long as it is ensured that the second communication groove 212 can be synchronously displaced as the commutation assembly 2 rotates and satisfies simultaneous conduction with the discharge port 1211 and the two feed ports 1221, which is not limited herein.

[0067] Furthermore, the groove is located inside the first communication groove 211 and the second communication groove 212 and preferably has a circular structure concentric with the first communication groove 211 and the second communication groove 212 to increase the opening area of the groove and reduce the friction between the commutation plate 21 and the valve head assembly 1.

[0068] Optionally, a boss portion 214 protrudes from the side of the commutation plate 21 facing the valve head assembly 1. The surface of the boss portion 214 is rotationally fitted with the first working surface. The first communication groove 211 is formed on the boss portion 214, and a groove separated from the first communication groove 211 is provided on the surface of the boss portion 214. By forming the first communication groove 211 on the boss portion 214 and only making the boss portion 214 on the commutation plate 21 rotationally fitted with the first working surface, the rotationally fitting area between the commutation plate 21 and the valve head assembly 1 is reduced, the frictional resistance during the rotation of the commutation plate 21 is lowered, and the smoothness of the commutation of the commutation valve is improved.

[0069] As Figure 7 and Figure 8 shown, optionally, at least two second positioning posts 221 are provided on one of the commutation plate 21 and the rotating shaft 22, and at least two second positioning holes 213 are provided on the other of the commutation plate 21 and the rotating shaft 22. The second positioning posts 221 and the second positioning holes 213 are arranged in one-to-one correspondence, and the second positioning posts 221 are inserted into the corresponding second positioning holes 213. The insertion and matching of at least two second positioning posts 221 and at least two second positioning holes 213 in one-to-one correspondence can enable the commutation plate 21 and the rotating shaft 22 to rotate synchronously, and the commutation plate 21 and the rotating shaft 22 will not rotate relative to each other, ensuring the accuracy and real-time performance of the commutation plate 21 switching between the first conduction position and the second conduction position, and further improving the commutation effect of the commutation valve.

[0070] Specifically, in the embodiment, the second positioning hole 213 is arranged on the commutation plate 21 and located outside the boss portion 214, and a plurality of second positioning holes 213 are arranged at intervals around the boss portion 214. This can avoid interference between the second positioning hole 213 and the boss portion 214, that is, avoid accidentally penetrating the first communication groove 211 or the second communication groove 212 when opening the second positioning hole 213, thereby ensuring the realization of the commutation function of the commutation valve.

[0071] Such as Figure 1 and Figure 8 As shown, optionally, the rotating shaft 22 includes a rotating head 222 and a rotating rod 223 connected to each other. The rotating head 222 is rotatably installed in the installation inner cavity, and the diameter of the rotating head 222 is larger than that of the rotating rod 223. The side of the rotating head 222 away from the rotating rod 223 is detachably connected to the commutation plate 21. The driving assembly is installed outside the fixed seat 5, and the rotating rod 223 passes through the fixed seat 5 and is connected to the driving assembly. The rotating head 222 is rotatably installed in the installation inner cavity, which can ensure good stability of the rotating head 222 during rotation and prevent shaking and displacement. When the sizes of the first communication groove 211 or the second communication groove 212 are relatively large, the rotating head 222 with a larger diameter can still adapt to the size of the commutation plate 21 and be firmly connected thereto, so as to better drive and support the commutation plate 21. The diameter of the rotating rod 223 is smaller, which can smoothly pass through the fixed seat 5 and be connected to the driving assembly, thereby avoiding interference and improving the space utilization rate.

[0072] Optionally, the commutation valve further includes a rotating shaft sealing ring 3, and the rotating shaft sealing ring 3 is sleeved on the outer periphery of the rotating head 222 and clamped between the rotating head 222 and the fixed seat 5; and / or, the commutation valve further includes a washer 4, and the washer 4 is sleeved on the outside of the rotating rod 223, and the washer 4 is clamped between the end face of the rotating head 222 and the bottom of the installation inner cavity. The setting of the rotating shaft sealing ring 3 can not only prevent the rotating head 222 from directly contacting the installation inner cavity when rotating in the installation inner cavity and causing wear, but also seal the gap between the rotating head 222 and the fixed seat 5, avoid abnormal noise caused by air extrusion due to poor sealing, and improve the rotation reliability and rotation smoothness of the rotating head 222 in the installation inner cavity. The setting of the washer 4 can effectively axially support the rotating head 222 to prevent the rotating head 222 from directly rotating and contacting the bottom of the installation inner cavity and causing wear; at the same time, by setting the washer 4, the rotating head 222 can be supported upward by the washer 4 to ensure the stable and reliable fit between the commutation plate 21 and the valve head assembly 1, and avoid problems such as gaps between the commutation assembly 2 and the first working surface caused by processing errors of the commutation assembly 2 or the fixed seat 5.

[0073] The above embodiments only illustrate the basic principles and characteristics of the present utility model. The present utility model is not limited by the above embodiments. Without departing from the spirit and scope of the present utility model, there are various changes and modifications to the present utility model, and these changes and modifications all fall within the scope of the present utility model claimed. The scope of protection claimed for the present utility model is defined by the appended claims and their equivalents.

Claims

1. A reversing valve, characterized in that, Comprising: A valve head assembly (1), the valve head assembly (1) is provided with a feed channel and two discharge channels, the discharge port (1211) of the feed channel and the feed ports (1221) of the two discharge channels are all provided on the first working surface of the valve head assembly (1); A commutation assembly (2), including a second working surface, the second working surface is rotationally and fittingly arranged with the first working surface, and the second working surface is provided with a first communication groove (211); A driving assembly, the driving assembly drives the commutation assembly (2) to rotate and switch between a first conduction position and a second conduction position; When the commutation assembly (2) is in the first conduction position, the first communication groove (211) is only hermetically communicated with the discharge port (1211) and one of the feed ports (1221); when the commutation assembly (2) is in the second conduction position, the first communication groove (211) is only hermetically communicated with the discharge port (1211) and the other feed port (1221); when the commutation assembly (2) is between the first conduction position and the second conduction position, a part of each feed port (1221) and the discharge port (1211) are all hermetically communicated with the first communication groove (211).

2. The directional control valve according to claim 1, characterized in that, The directional control valve further includes a fixed seat (5), the fixed seat (5) has an installation inner cavity, the valve head assembly (1) is installed at the first end of the fixed seat (5), the commutation assembly (2) is rotatably installed in the installation inner cavity, and the driving assembly is located on the side of the fixed seat (5) away from the valve head assembly (1).

3. The reversing valve according to claim 2, characterized in that, The valve head assembly (1) includes a valve head (11) and a sealing seat (12), the valve head (11) is installed on the outer side of one end of the fixed seat (5), the sealing seat (12) is located in the installation inner cavity and is clamped between the valve head (11) and the commutation assembly (2), and one side surface of the sealing seat (12) facing the commutation assembly (2) forms the first working surface; The feed channel extends from the outer side wall of the valve head (11) to the first working surface, and the discharge channel extends from the outer side wall of the valve head (11) to the first working surface.

4. The reversing valve according to claim 3, characterized in that, One of the valve head (11) and the sealing seat (12) is provided with at least two first positioning posts (13), the other of the valve head (11) and the sealing seat (12) is provided with at least two first positioning holes (123), the first positioning posts (13) and the first positioning holes (123) are arranged in one-to-one correspondence, and the first positioning posts (13) are inserted into the corresponding first positioning holes (123).

5. The directional control valve according to claim 2, characterized in that, The commutation assembly (2) includes a commutation plate (21) and a rotating shaft (22), one side of the commutation plate (21) is rotationally and fittingly arranged with the first working surface and is provided with the first communication groove (211), the other opposite side of the commutation plate (21) is detachably connected to one end of the rotating shaft (22), the rotating shaft (22) is rotationally matched with the fixed seat (5), and the other end of the rotating shaft (22) is connected to the driving assembly.

6. The reversing valve according to claim 5, characterized in that, One side of the reversing plate (21) facing the valve head assembly (1) is convexly provided with a boss portion (214). The surface of the boss portion (214) is rotationally attached to the first working surface. The first communication groove (211) is formed in the boss portion (214), and a groove separated from the first communication groove (211) is provided on the surface of the boss portion (214).

7. The directional control valve according to claim 5, characterized in that, At least two second positioning posts (221) are provided on one of the reversing plate (21) and the rotating shaft (22), and at least two second positioning holes (213) are provided on the other of the reversing plate (21) and the rotating shaft (22). The second positioning posts (221) and the second positioning holes (213) are arranged in one-to-one correspondence, and the second positioning posts (221) are inserted into the corresponding second positioning holes (213).

8. The reversing valve according to claim 5, characterized in that, The rotating shaft (22) includes a rotating head (222) and a rotating rod (223) connected to each other. The rotating head (222) is rotatably installed in the installation inner cavity, and the diameter of the rotating head (222) is larger than that of the rotating rod (223). One side of the rotating head (222) away from the rotating rod (223) is detachably connected to the reversing plate (21). The driving assembly is installed outside the fixed seat (5), and the rotating rod (223) passes through the fixed seat (5) and is connected to the driving assembly.

9. The directional control valve according to claim 8, wherein, The reversing valve further includes a rotating shaft sealing ring (3). The rotating shaft sealing ring (3) is sleeved on the outer periphery of the rotating head (222) and clamped between the rotating head (222) and the fixed seat (5). And / or, the reversing valve further includes a washer (4). The washer (4) is sleeved on the outside of the rotating rod (223), and the washer (4) is clamped between the end face of the rotating head (222) and the bottom of the installation inner cavity.

10. The reversing valve according to any one of claims 1-9, characterized in that, The first communication groove (211) has an arc-shaped structure, and the center of the arc-shaped structure is located on the rotation axis of the reversing assembly (2). The discharge port (1211) and the two feed ports (1221) are arranged at intervals around the rotation axis, and the two feed ports (1221) are respectively located on both sides of the discharge port (1211).

11. The reversing valve according to any one of claims 1-9, characterized in that, The second working surface is further provided with a second communication groove (212). The second communication groove (212) and the first communication groove (211) are arranged at intervals along the rotation direction of the reversing assembly (2). The driving assembly can drive the reversing assembly (2) to rotate until the discharge port (1211) and the two feed ports (1221) are both communicated with the second communication groove (212).

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