Check valve, branching device with check valve and cleaning device

Abstract

A branching device (20) as a one-way valve assembled in a cleaning device includes: a main body (26) including an inflow path (22) and a first outflow path (24a); a sealing member (30) configured to allow the flow of a cleaning fluid from the inflow path (22) to the first outflow path (24a) when the cleaning device is in operation, and to seal the backflow of the cleaning fluid from the first outflow path (24a) to the inflow path (22) when the cleaning device is not in operation; and a cover member (28) combined with the main body (26) to form a receiving chamber 34 of the sealing member (30). The cover member (28) has a connecting hole (40) that connects the receiving chamber (34) to the outside. A water receiving recess (42) is provided in the cover member (28) or the main body (26), and the water receiving recess (42) is arranged around the connecting hole (40).

Description

Technical Field

[0001] The present invention relates to a one-way valve and a cleaner device equipped with the same. In addition, the present invention relates to a branching tool with a one-way valve and a cleaner device equipped with the same. Background Art

[0002] In the past, a vehicle cleaning system is known, which is used to clean sensors such as cameras mounted on vehicles (for example, refer to Patent Document 1). In this cleaning system, a plurality of nozzles are provided, and various devices can be cleaned by spraying cleaning fluid from each nozzle. These nozzles are connected to a tank and a pump of the cleaning fluid via a pipeline. The pipeline has a branching portion, which is used to branch to each nozzle. A one-way valve is provided at the branching portion, which is used to prevent the backflow of the cleaning fluid returning to the tank.

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] Patent Document 1: International Publication No. 2018 / 230558 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] The inventors have studied the above-mentioned vehicle cleaning system and found the following problems. For example, water droplets may sometimes adhere to the surface of the one-way valve due to condensation caused by changes in the ambient temperature or humidity. When the attached water droplets penetrate into the one-way valve, the operation of the one-way valve may be adversely affected.

[0008] One aspect of the present invention has been made in view of such circumstances, and one of its exemplary purposes is to suppress the intrusion of water into the inside of a one-way valve incorporated in a cleaner device.

[0009] In addition, the inventors have conducted research on the above-mentioned vehicle cleaner system and have recognized the following problems. In the case where a nozzle is connected to another nozzle via a pipeline and a branching portion, for the flow path connecting the nozzles, the cleaning fluid (such as cleaning liquid) flowing due to the cleaning action of the cleaner system may be retained in the flow path when the cleaning action ends. Then, although the cleaner device is not in operation, due to external vibrations or shocks or other factors, the following situation may sometimes occur: the retained cleaning fluid moves along the flow path, and some of the cleaning fluid leaks out from any nozzle. However, such leakage is not an intentional action and is not preferred. Not only in the vehicle cleaner system, but also in general-purpose cleaner devices, such leakage can be expected to be alleviated or prevented.

[0010] One aspect of the present invention has been made in view of such circumstances, and one of the exemplary objects thereof is to suppress the movement of the cleaning fluid in the flow path when the cleaning device is not in operation.

[0011] [Technical solutions for solving technical problems]

[0012] One embodiment of the present invention relates to a one-way valve for assembly in a cleaning device. The one-way valve includes: a main body, which includes an inflow path and at least one outflow path; a sealing member, which is configured to allow the flow of cleaning fluid from the inflow path to the outflow path when the cleaning device is in operation, and to seal the backflow of cleaning fluid from the outflow path to the inflow path when the cleaning device is not in operation; and a cover member, which is combined with the main body to form a storage chamber for the sealing member. The cover member has a connecting hole, which connects the storage chamber with the outside. A water receiving recess is provided in the cover member or the main body, and the water receiving recess is arranged around the connecting hole.

[0013] In the case where the movement of the sealing member in the one-way valve accompanying the operation of the cleaner device, or the change in ambient temperature / humidity causes excessive pressure fluctuations in the storage chamber of the sealing member, the pressure fluctuations may hinder the proper opening and closing action of the sealing member. However, if the storage chamber of the sealing member is connected to the outside, the pressure fluctuations in the storage chamber will be released to the outside air, so the excessive pressure fluctuations will be suppressed. In addition, in the case where water droplets (for example, due to condensation) penetrate from the connecting hole, the action of the sealing member may also be hindered. However, because a water receiving recess is provided around the connecting hole, even if water droplets attached to the surface of the main body or the cover member approach the connecting hole, they will be blocked by being received in the water receiving recess. The infiltration of water into the storage chamber, i.e., the inside of the one-way valve, can be suppressed.

[0014] Alternatively, the water receiving recess may extend in a groove-like manner to surround the periphery of the communicating hole. With such a configuration of the water receiving recess, when water drops flow from the periphery toward the communicating hole, the possibility of entering the water receiving recess before reaching the communicating hole is increased. Therefore, the approach of water drops to the communicating hole and even the infiltration of water into the inside of the one-way valve can be more effectively suppressed.

[0015] Alternatively, the cover member forms a bottom surface of the one-way valve having a central portion and a peripheral portion. Alternatively, the communicating hole penetrates from the receiving chamber to the central portion of the bottom surface. Alternatively, the central portion of the bottom surface is recessed upward relative to the peripheral portion. In this way, the central portion of the bottom surface of the one-way valve provided with the communicating hole is recessed upward, so that water droplets are difficult to enter this portion due to the effect of gravity. Therefore, the approach of water droplets to the communicating hole and even the infiltration of water into the inside of the one-way valve can be better suppressed.

[0016] Alternatively, the main body includes a plurality of outflow paths. Alternatively, the sealing member is configured to seal the reverse flow of the cleaning fluid from the plurality of outflow paths to the inflow path when the cleaning device is not in operation, and to seal the flow of the cleaning fluid between the plurality of outflow paths. The plurality of outflow paths may be connected to the nozzles corresponding to each other, but for the flow path connecting the nozzles, the cleaning fluid (e.g., cleaning liquid) flowing due to the cleaning action of the cleaning system may be directly retained in the flow path when the cleaning action is ended. Then, although the cleaning device is not in operation, due to external vibration or impact or other factors, the following situation may sometimes exist: the retained cleaning fluid moves along the flow path, and the cleaning fluid leaks out from any nozzle. The sealing member can not only seal the reverse flow of the cleaning fluid from the plurality of outflow paths to the inflow path when the cleaning device is not in operation, but also seal the flow of the cleaning fluid between the plurality of outflow paths. Therefore, the movement of the cleaning fluid in the flow path when the cleaning device is not in operation can be suppressed, and the unexpected leakage of the cleaning fluid from the nozzle can be suppressed.

[0017] Another embodiment of the present invention relates to a cleaning device. The cleaning device may include: the one-way valve of any of the above embodiments; and a cleaning nozzle configured to spray cleaning fluid toward the object to be cleaned and connected to an outflow path of the one-way valve.

[0018] The cleaning device may also be mounted on a vehicle. The object to be cleaned may also be a vehicle-mounted device.

[0019] One embodiment of the present invention relates to a branching device with a one-way valve for being assembled in a cleaning device. The branching device with a one-way valve includes: a main body, which includes an inlet, a first outlet having a first opening end, and a second outlet having a second opening end, and the cleaning fluid from the inlet flows into the first outlet from the first opening end and flows into the second outlet from the second opening end; and a sealing member, which is installed on the main body and is configured to allow the cleaning fluid to flow from the inlet to the first outlet and the second outlet when the cleaning device is in operation. The sealing member is configured to seal the backflow of the cleaning fluid from the first outlet and the second outlet to the inlet by contacting the first opening end and the second opening end when the cleaning device is not in operation, and to seal the flow of the cleaning fluid between the first outlet and the second outlet.

[0020] According to this scheme, the sealing member can be in contact with the first opening end of the first outflow path and the second opening end of the second outflow path when the cleaning device is not in operation, thereby not only sealing the backflow of the cleaning fluid from the first outflow path and the second outflow path to the inflow path, but also sealing the flow of the cleaning fluid between the first outflow path and the second outflow path. Therefore, the movement of the cleaning fluid in the flow path when the cleaning device is not in operation can be suppressed.

[0021] Alternatively, the second opening end may be arranged on the inner side relative to the first opening end. With such an arrangement of the two opening ends, when the cleaning fluid flows from the outside to the inside (or in the opposite direction) in the main body due to the inflow of the cleaning fluid into the branching device main body, the flow can be utilized to make a part of the flow pass through the first opening end on the outer side to the first outflow path, and another part of the flow pass through the second opening end on the inner side to the second outflow path, thereby easily diverting the cleaning fluid.

[0022] Alternatively, a conical surface whose inner diameter becomes smaller toward the inside of the second outflow path may be formed at the second opening end, and the sealing member may also contact the conical surface. In this way, when the cleaning device is in operation, when the sealing member leaves the conical surface, the inflowing cleaning fluid can be guided along the conical surface toward the inside of the second outflow path. Compared with a case where no conical surface is provided, it becomes easier to ensure a flow path between the sealing member and the second opening end.

[0023] Alternatively, the sealing member may have a convex curved surface toward the second outflow path, and the curved surface may also contact the tapered surface. In this way, the sealing member contacts the second open end linearly along the second open end in the circumferential direction, thereby increasing the contact pressure compared to contacting with a larger area by the same sealing force, which may lead to an improvement in sealing performance.

[0024] Alternatively, the inlet path is arranged outside relative to the first opening end and the second opening end. In this way, the flow of the cleaning fluid from the inlet path to the bifurcated body can be generated in the main body from the outside to the inside. In addition, generally, from the center, the closer the diameter is to the outside, the larger the diameter is, so the closer the diameter is to the outside, the easier it is to obtain a larger area. Therefore, the area acted upon by the flow of the cleaning fluid flowing in from the inlet path can be obtained, thereby, the seal of the sealing member can be released when the cleaner device is in action with a smaller inlet pressure (specifically, the increment of the pressure of the inlet path relative to the outflow path).

[0025] Alternatively, the inlet, the first outlet and the second outlet are configured as concentric circles. In this way, a radial flow of the cleaning fluid can be generated in the bifurcated tool body, and the flow can be easily guided from the inlet to the first outlet and the second outlet. In addition, for the contact portion between the first opening end of the first outlet and the second opening end of the second outlet and the sealing member, i.e., the first sealing portion and the second sealing portion, a shape without corners (or with fewer corners) such as a circular shape is adopted, so that it becomes easy to achieve uniform sealing of the sealing portion over the entire circumference.

[0026] Alternatively, the fork with a one-way valve also includes a cover member, which is combined with the main body to form a storage chamber for the sealing member. The cover member may also have a connecting hole that connects the storage chamber to the outside. A water receiving recess may also be provided in the cover member or the main body, and the water receiving recess is arranged around the connecting hole. In the case where the movement of the sealing member accompanying the action of the cleaner device or the change of the ambient temperature / humidity brings excessive pressure changes to the storage chamber of the sealing member, the pressure changes may hinder the proper opening and closing action of the sealing member. However, if the storage chamber of the sealing member is connected to the outside, the pressure changes in the storage chamber will be released to the outside air, so the excessive pressure changes will be suppressed. In addition, in the case where water droplets (for example, based on condensation) penetrate from the connecting hole, the action of the sealing member may also be hindered. However, because a water receiving recess is provided around the connecting hole, even if the water droplets attached to the surface of the fork body or the cover member approach the connecting hole, they will be blocked by being received in the water receiving recess. It is possible to suppress the infiltration of water into the storage chamber, i.e., the inside of the fork.

[0027] Another embodiment of the present invention relates to a cleaning device. Alternatively, the cleaning device includes: a branching device with a one-way valve according to any of the above embodiments; and at least one cleaning nozzle, the at least one cleaning nozzle being configured to spray a cleaning fluid onto an object to be cleaned and being connected to at least one of a first outflow path and a second outflow path of the branching device with a one-way valve.

[0028] The cleaning device may also be mounted on a vehicle. The object to be cleaned may also be a vehicle-mounted device.

[0029] Effects of the Invention

[0030] According to one aspect of the present invention, it is possible to suppress water from entering the inside of a check valve incorporated in a cleaning device. According to one aspect of the present invention, it is possible to suppress movement of a cleaning fluid in a flow path when the cleaning device is not in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram showing a cleaning device according to an embodiment.

[0032] Figure 2 yes Figure 1 A partially cutaway perspective view of the bifurcated tool is shown.

[0033] Figure 3 Yes means Figure 1 Schematic diagram of the internal flow path of the bifurcated device shown.

[0034] Figure 4 Observed from the bottom Figure 1 The stereogram obtained with the bifurcation shown.

[0035] Figure 5Schematic diagram showing a cleaning device according to an embodiment.

[0036] Figure 6 Yes Figure 2 The first sealing portion is shown in an enlarged and schematic partial cross-sectional view.

[0037] Figure 7 Yes Figure 2 The second sealing portion shown is an enlarged and schematic partial cross-sectional view.

[0038] Figure 8 This is a schematic diagram for explaining the effect of the water receiving recess provided in the branching tool.

[0039] Fig. 9 This is a perspective view of a one-way valve according to another embodiment as viewed from below.

[0040] Fig.10 yes Fig. 9 A longitudinal sectional view of the one-way valve is shown. DETAILED DESCRIPTION

[0041] Hereinafter, with reference to the accompanying drawings, the present invention will be described based on preferred embodiments. The embodiments do not limit the invention, but are merely illustrative, and all features and combinations thereof described in the embodiments are not necessarily limited to the substantive contents of the invention. The same or equivalent constituent elements, components, and processes shown in the drawings are marked with the same figure numerals, and repeated descriptions are appropriately omitted. In addition, the scales or shapes of the various parts shown in the drawings are set for ease of description and will not be interpreted restrictively unless otherwise mentioned. In addition, the terms "first", "second", etc. used in this specification or claims do not indicate any order or importance, but are only used to distinguish a certain composition from other compositions. In addition, in each of the drawings, a part of the components that are not important in describing the embodiments will be omitted from display.

[0042] Figure 1 1 is a schematic diagram showing a cleaning device 10 according to an embodiment. In this embodiment, the cleaning device 10 is a vehicle cleaning device mounted on a vehicle such as an automobile, and is configured to clean an object to be cleaned 11. The object to be cleaned 11 may be, for example, an on-vehicle sensor such as an on-vehicle camera, or may be other on-vehicle equipment.

[0043] The cleaning device 10 includes a cleaning liquid tank 12, a pump 13, a plurality of (two in this example) cleaning nozzles 14, and a branching device 20. The branching device 20 includes an inflow channel 22, a first outflow channel 24a, and a second outflow channel 24b.

[0044] The cleaning liquid tank 12 is connected to the inflow path 22 of the branching device 20 by a supply pipe 15 such as a hose. The pump 13 is arranged at the outlet of the cleaning liquid tank 12 or in the middle of the supply pipe 15, and sends the cleaning liquid from the cleaning liquid tank 12 to the branching device 20 and then to each cleaning nozzle 14. The first outflow path 24a of the branching device 20 is connected to one cleaning nozzle 14 by a connecting pipe 16 such as a hose. The second outflow path 24b of the branching device 20 is connected to another cleaning nozzle 14 by another connecting pipe 16. Each cleaning nozzle 14 has a spray port 14a on its side or front end, and the spray port 14a is used to spray cleaning liquid onto the object to be cleaned 11. The cleaning nozzles 14 are respectively configured to spray cleaning liquid onto different objects to be cleaned 11. Alternatively, the cleaning nozzles 14 may be respectively configured to spray cleaning liquid onto different parts of the same object to be cleaned 11 or the same part of the same object to be cleaned 11 from different directions.

[0045] Therefore, when the cleaning device 10 is in operation, that is, when the cleaning action is performed, the cleaning liquid will be Figure 1 17, 18, 19 schematically show the flow. Due to the operation of the pump 13, the cleaning liquid flows from the cleaning liquid tank 12 through the supply pipe 15 to the inlet path 22 of the branching device 20. The branching device 20 is configured to allow the cleaning liquid to flow from the inlet path 22 to the first outflow path 24a and the second outflow path 24b when the cleaning device 10 is in operation. The cleaning liquid is branched into the first outflow path 24a and the second outflow path 24b in the branching device 20, and flows to the cleaning nozzle 14 through the connecting pipe 16 respectively. Then, the cleaning liquid is sprayed from the spray port 14a of the cleaning nozzle 14 to the object to be cleaned 11, and the object to be cleaned 11 is cleaned at the same time.

[0046] In addition, when it is desired to clean each object 11 at a different appropriate timing, a shutter or other switching mechanism for opening and closing the injection port 14a or the internal flow path of the cleaning nozzle 14 connected to the connection pipe 16 may be provided in each cleaning nozzle 14. Such a switching mechanism may also be provided in the outflow path of the connection pipe 16 or the branching device 20 connected to each cleaning nozzle 14. Since these switching mechanisms are controlled individually, the switch of the injection of the cleaning liquid can be switched for each cleaning nozzle 14.

[0047] When the washer device 10 is not in operation, that is, when the washing operation is not being performed, the pump 13 is stopped, thereby also stopping the supply of the washing liquid from the washing liquid tank 12 to the washing nozzle 14 .

[0048] The branching tool 20 has a one-way valve function, which will be described in detail later. Therefore, the branching tool 20 can be regarded as a one-way valve. The branching tool 20 is configured to seal the backflow of the cleaning liquid from the first outflow path 24a and the second outflow path 24b to the inflow path 22 when the cleaning device 10 is not in operation, and to seal the flow of the cleaning liquid between the first outflow path 24a and the second outflow path 24b.

[0049] Figure 2 20 is a partially cutaway perspective view of the bifurcating tool 20. Figure 2 , there is shown a cross-section of the branching device 20 formed by a plane including the central axis 36 of the branching device 20 and the tube axis of the inflow path 22 perpendicular thereto, and a cross-section of the branching device 20 formed by a plane including the central axis 36 and the tube axis of the first outflow path 24a perpendicular thereto. Figure 3 Schematic diagram showing the internal flow path of the branching device 20. Figure 3 In FIG. 1 , the branching device 20 is viewed from below, and the inflow channel 22 , the first outflow channel 24 a , and the second outflow channel 24 b are shown in a perspective view. Figure 4 This is a perspective view of the branching tool 20 as viewed from the bottom.

[0050] The branching tool 20 includes a main body 26, a cover member 28, a sealing member 30, and a force member 32. The main body 26 is provided with an inlet passage 22, a first outlet passage 24a, and a second outlet passage 24b. The first outlet passage 24a has a first opening end 25a, and the second outlet passage 24b has a second opening end 25b. The cover member 28 is combined with the main body 26 to form a cavity in the branching tool 20, and the cavity is used as a receiving chamber 34 for the sealing member 30. The receiving chamber 34 also receives the force member 32 together with the sealing member 30. The infiltration of the cleaning liquid into the receiving chamber 34 is prevented by the sealing member 30, or is suppressed to a minimum.

[0051] The sealing member 30 acts as a valve body of a one-way valve. When the cleaner device 10 is not in operation, the sealing member 30 contacts the first opening end 25a to form a first sealing portion, and contacts the second opening end 25b to form a second sealing portion. Figure 2 As shown, the sealing member 30 is configured to seal the backflow of the cleaning liquid from the first outflow path 24a and the second outflow path 24b to the inflow path 22 by contacting the first opening end 25a and the second opening end 25b when the cleaning device 10 is not in operation, and to seal the flow of the cleaning liquid between the first outflow path 24a and the second outflow path 24b. That is, at this time, the one-way valve is closed.

[0052] On the other hand, the sealing member 30 is configured to allow the cleaning liquid to flow from the inlet passage 22 to the first outlet passage 24a and the second outlet passage 24b when the cleaning device 10 is in operation. Figure 5 The one-way valve is opened, and the cleaning liquid from the inflow path 22 flows into the first outflow path 24a from the first opening end 25a in the main body 26, and flows into the second outflow path 24b from the second opening end 25b. The biasing member 32 is provided as a return spring, and the return spring elastically biases the sealing member 30 as the valve body toward the original sealing position.

[0053] The main body 26 and the cover member 28 are formed of, for example, a suitable synthetic resin material such as polyacetal resin, acrylic resin, or polycarbonate resin. The sealing member 30 is formed of, for example, EPDM (ethylene propylene diene monomer rubber), but may also be formed of other rubbers or other soft resin materials having waterproof properties. The urging member 32 can be formed of, for example, a suitable metal material such as stainless steel.

[0054] Reference Figure 2 and Figure 3 , the flow path structure inside the branching tool 20 is described. In this embodiment, relative to Figure 2 The central axis 36 shown in the figure has an inflow path 22 on one side and a first outflow path 24a and a second outflow path 24b on the other side, and the bifurcating device 20 forms a "Y"-shaped cleaning liquid flow path. The inflow path 22, the first outflow path 24a and the second outflow path 24b extend radially outward from the main body 26 in a direction perpendicular to the central axis 36.

[0055] As shown in the figure, the fork 20 can be set in such a way that the main body 26 is upward and the cover member 28 is downward. Therefore, in this specification, for convenience, regarding the direction of the central axis 36, the side close to the main body 26 is sometimes expressed as the upper side, above, upper part, etc., and the side close to the cover member 28 is expressed as the lower side, below, lower part, etc. However, this does not mean that the fork 20 must be configured in such a specific posture. The fork 20 can also be set in other postures such as, for example, with the main body 26 facing downward.

[0056] The main body 26 includes an upper plate portion 26a, an upper side wall 26b, a lower side wall 26c, a first inner wall 26d, and a second inner wall 26e, and these parts of the main body 26 are integrally formed. The upper portion of the branching tool 20 including the upper plate portion 26a, the upper side wall 26b, the first inner wall 26d, and the second inner wall 26e is mainly configured as a flow path for the cleaning liquid, and the lower portion of the branching tool 20 including the lower side wall 26c is configured as a storage chamber 34 for the sealing member 30 and the biasing member 32.

[0057] The upper plate portion 26a is connected to the lower side wall 26c by the upper side wall 26b. As an example, the upper plate portion 26a has a disk-like shape centered on the central axis 36, and the upper side wall 26b and the lower side wall 26c each have a cylindrical shape centered on the central axis 36. The lower side wall 26c has a larger diameter than the upper side wall 26b.

[0058] The upper side wall 26b is connected with the inflow path 22 and the first outflow path 24a, and they are arranged at the same height. Here, the so-called height refers to the position in the direction of the central axis 36. The second outflow path 24b is arranged at a height different from the first outflow path 24a, specifically, slightly above, and is connected to the center of the upper plate portion 26a.

[0059] The first inner wall 26d and the second inner wall 26e extend downward from the upper plate portion 26a at a position radially inwardly closer to the upper side wall 26b. The lower end of the first inner wall 26d corresponds to the first opening end 25a, and the lower end of the second inner wall 26e corresponds to the second opening end 25b. The first inner wall 26d and the second inner wall 26e also have a cylindrical shape centered on the central axis 36. The first inner wall 26d has a larger diameter than the second inner wall 26e. That is, the upper side wall 26b, the first inner wall 26d and the second inner wall 26e are arranged concentrically from the radially outer side to the central axis 36 in the order of the description. Therefore, the second opening end 25b is arranged inside relative to the first opening end 25a, and these two opening ends are arranged concentrically.

[0060] As per Figure 2 and Figure 3 As understood, the upper space in the bifurcated tool 20 surrounded by the upper plate portion 26a, the upper side wall 26b and the sealing member 30 is divided by the first inner wall 26d and the second inner wall 26e, and as mentioned above, the first opening end 25a and the second opening end 25b are in contact with the sealing member 30. The first inner wall 26d separates the inflow path 22 from the first outflow path 24a. In this way, in the main body 26, between the upper side wall 26b and the first inner wall 26d, an annular area as the outlet of the inflow path 22 is formed. Between the first inner wall 26d and the second inner wall 26e, as the entrance of the first outflow path 24a, another annular area is formed. The inner side of the second inner wall 26e will become the entrance of the second outflow path 24b.

[0061] The upper side wall 26b, the first inner wall 26d, and the second inner wall 26e are arranged in a concentric circle shape, so the outlet of the inlet path 22, the inlet of the first outflow path 24a, and the inlet of the second outflow path 24b are also arranged in a concentric circle shape. The inlet of the first outflow path 24a is connected to the tubular portion of the first outflow path 24a extending from the main body 26. In addition, the second outflow path 24b extends upward from its inlet along the central axis 36, penetrates the upper plate portion 26a, bends at a right angle, and extends radially. When the cleaning device 10 is in operation, as shown in FIG. Figure 3 As shown by arrows 29a, 29b, and 29c in FIG. 1 , the cleaning liquid flows through the inflow path 22, the first outflow path 24a, and the second outflow path 24b in the main body 26.

[0062] like Figure 2 As shown, the sealing member 30 has a convex curved surface at the center of the upper surface, and in addition, the upper surface of the sealing member 30 is a substantially flat area at a radially outer side thereof. The convex curved surface of the sealing member 30 has, for example, a hemispherical shape, the center of which is located on the central axis 36. The sealing member 30 contacts the first opening end 25a in the flat area on the outer peripheral side to form the first sealing portion, and contacts the second opening end 25b at the convex curved surface of the central portion to form the second sealing portion. The first opening end 25a and the second opening end 25b are respectively in contact with the sealing member 30 throughout their entire circumference. In order to make it suitable for the shape of the sealing member 30 in the height direction (the direction of the central axis 36), the second opening end 25b is arranged above compared with the first opening end 25a.

[0063] The sealing member 30 is sandwiched and held between the main body 26 and the cover member 28 at its outer peripheral edge. The outer peripheral portion of the upper surface of the sealing member 30 abuts against the step portion 26f of the main body 26 connecting the upper side wall 26b and the lower side wall 26c, and the outer peripheral portion of the lower surface of the sealing member 30 abuts against the outer peripheral portion of the cover member 28. The shape of the outer periphery of the sealing member 30 matches the inner surface shape of the lower side wall 26c of the main body 26 and is a circular shape. The outer peripheral surface of the cover member 28 and the inner peripheral surface of the lower side wall 26c of the main body 26 are engaged with each other, thereby, the cover member 28 is fixed to the main body 26, and the sealing member 30 is sandwiched between the main body 26 and the cover member 28.

[0064] The lower surface of the sealing member 30 contacts the biasing member 32 and is elastically supported by the biasing member 32. A pressing plate 38 may be provided between the sealing member 30 and the biasing member 32, and the sealing member 30 may be elastically supported by the biasing member 32 via the pressing plate 38. Alternatively, the pressing plate 38 may be provided adjacent to the center portion of the lower surface of the sealing member 30.

[0065] As an example, the force member 32 has: a plurality of arms that function as springs; and an inner periphery and an outer periphery that are connected by the arms. The arm bends and extends between the inner periphery and the outer periphery, for example, in a serpentine or spiral shape. The arm, inner periphery, and outer periphery of the force member 32 are arranged roughly along a plane perpendicular to the central axis 36, and the inner periphery can be elastically displaced relative to the outer periphery in the direction of the central axis 36 through elastic deformation of the arm. The outer periphery of the force member 32 is sandwiched and held between the main body 26 and the cover member 28 (more specifically, between the seal member 30 and the cover member 28), similarly to the seal member 30. The inner periphery of the force member 32 contacts the lower surface of the seal member 30 or the pressure plate 38, and elastically supports the seal member 30.

[0066] like Figure 4 As shown, the cover member 28 has a central portion 28a and an outer peripheral portion 28b, which form the bottom surface of the bifurcating tool 20. The bottom surface has a shape in which the central portion 28a is recessed upward relative to the outer peripheral portion 28b.

[0067] and Figure 4 Together, refer to Figure 2 The cover member 28 has at least one (in this example, four) connecting holes 40 that connect the receiving chamber 34 to the outside. The connecting hole 40 penetrates the cover member 28 from the receiving chamber 34 to the center portion 28a of the bottom surface. Assuming that there is no connecting hole 40 and the receiving chamber 34 is not connected to the outside, the pressure in the receiving chamber 34 may change excessively (for example, increase) due to the movement of the sealing member 30 accompanied by the operation of the cleaner device 10, or the change of the ambient temperature or humidity. This pressure change may hinder the proper movement of the sealing member 30. However, in this embodiment, the pressure change can be released to the outside air through the connecting hole 40, thereby, the pressure of the receiving chamber 34 can be properly maintained.

[0068] In addition, the cover member 28 is provided with a water receiving recess 42, which is arranged around the communicating hole 40. The water receiving recess 42 extends in a groove shape so as to surround the communicating hole 40. The water receiving recess 42 is formed along the outer peripheral portion 28b of the cover member 28. As shown in the figure, the water receiving recess 42 is formed into a plurality of (in Figure 4 In addition, instead of the water receiving recess 42 provided in the cover member 28, or in addition thereto, the water receiving recess may be provided in the body 26, for example, at a location surrounding the cover member 28, for example, at the bottom surface of the lower side wall 26c.

[0069] Reference Figure 2 , Figure 3 and Figure 5 , the operation of the bifurcating tool 20 will be described. Figure 2 As described above, the branching tool 20 of the cleaning device 10 is shown when it is not in operation. At this time, the branching tool 20 is in a closed state as a one-way valve. Figure 5 , the branching tool 20 is shown when the cleaner device 10 is in operation. At this time, the branching tool 20 is in an open state as a one-way valve.

[0070] When the cleaning device 10 is in operation, the cleaning liquid first flows into the annular area ( ) adjacent to the inner side of the upper side wall 26b which is the outlet of the inflow path 22. Figure 3 and Figure 5 Due to the pressure of the inflowing cleaning fluid, the sealing member 30 is forced downward along the central axis 36, and deforms or displaces downward relative to the main body 26 ( Figure 5 As shown by arrow 31), the force applying member 32 is also deformed downward in the receiving chamber 34 together with the sealing member 30. As a result, Figure 5 As shown, the sealing member 30 is separated from the first opening end 25a and the second opening end 25b, that is, the branching tool 20 as a one-way valve is switched from the closed state to the open state.

[0071] At this time, the cleaning liquid flows from the inflow path 22 through the gap formed between the first opening end 25a and the upper surface of the sealing member 30, and flows into the annular area ( Figure 5 A portion of the inflowing cleaning liquid flows around the outside of the second inner wall 26e in the circumferential direction and flows out of the main body 26 through the first outflow path 24a ( Figure 3 The remaining portion of the cleaning liquid that has flowed into the inner side of the first inner wall 26d flows into the inner side of the second inner wall 26e, i.e., the second outflow path 24b, through the gap formed between the second opening end 25b and the upper surface of the sealing member 30 (specifically, the convex curved surface at the center of the upper surface), and flows out of the main body 26 ( Figure 5 Thus, the cleaning liquid is divided into the first outflow path 24a and the second outflow path 24b in the branching device 20, and is directed to the first outflow path 24a and the second outflow path 24b. Figure 1 The cleaning nozzle 14 shown is supplied.

[0072] On the other hand, when the cleaning device 10 is not in operation, the inflow of the cleaning liquid from the inflow path 22 is stopped, and the pressure of the cleaning liquid acting on the sealing member 30 is reduced. Due to the elastic restoring force of the sealing member 30 itself and the elastic restoring force acting on the sealing member 30 from the urging member 32, the sealing member 30 and the urging member 32 are deformed or displaced upward relative to the main body 26. In this way, the sealing member 30 contacts the first opening end 25a and the second opening end 25b again, the first sealing portion and the second sealing portion are formed again, and the branching tool 20 is switched from the open state to the closed state.

[0073] At this time, the backflow of the cleaning liquid retained in the first outflow path 24a to the inflow path 22 is blocked at the first sealing portion. The leakage of the cleaning liquid from the first outflow path 24a to the second outflow path 24b is blocked at the second sealing portion. In addition, the backflow of the cleaning liquid retained in the second outflow path 24b to the inflow path 22 and the leakage of the cleaning liquid from the second outflow path 24b to the first outflow path 24a are blocked at the second sealing portion.

[0074] Therefore, according to the branching device 20 of the embodiment, the sealing member 30 can be in contact with the first opening end 25a of the first outflow path 24a and the second opening end 25b of the second outflow path 24b when the cleaner device 10 is not in operation, thereby not only sealing the backflow of the cleaning liquid from the first outflow path 24a and the second outflow path 24b to the inflow path 22, but also sealing the flow of the cleaning liquid between the first outflow path 24a and the second outflow path 24b. Therefore, the movement of the cleaning liquid through the branching device 20 when the cleaner device 10 is not in operation, especially the movement of the cleaning liquid between the multiple cleaning nozzles 14, can be suppressed. Although the cleaner device is not in operation, it is possible to prevent the movement of the retained cleaning liquid by vibration or impact from the outside, and the cleaning liquid can be accidentally leaked from any cleaning nozzle 14, or the possibility thereof can be reduced.

[0075] In addition, the second opening end 25b is arranged radially inward relative to the first opening end 25a. By such an arrangement of the two opening ends, when a supply flow of the cleaning liquid from the outside to the inside of the main body 26 is generated due to the inflow of the cleaning liquid from the inflow path 22 to the main body 26 of the branching device 20, the cleaning liquid can be easily diverted by making a part of the flow pass through the first opening end 25a on the outside to the first outflow path 24a, and making another part of the flow pass through the second opening end 25b on the inside to the second outflow path 24b.

[0076] The inlet path 22 is arranged radially outward relative to the first opening end 25a and the second opening end 25b. In this way, the flow of the cleaning liquid from the inlet path 22 to the main body 26 of the forking device 20 can be easily generated from the outside to the inside of the main body 26. Generally, the diameter will be larger as it is located on the outside from the center, so the larger the area is, the easier it is to obtain a larger area as it is located on the outside. Therefore, the area acted upon by the flow of the cleaning liquid flowing in from the inlet path 22 can be obtained, thereby, the seal of the sealing member 30 can be released when the cleaner device 10 is in operation with a smaller inlet pressure (specifically, the increment of the pressure of the inlet path 22 relative to the first outflow path 24a and the second outflow path 24b).

[0077] The inflow passage 22, the first outflow passage 24a and the second outflow passage 24b are arranged in a concentric circle shape. In this way, the cleaning liquid can be caused to flow radially in the main body 26 of the forking device 20, and the flow can be easily guided from the inflow passage 22 to the first outflow passage 24a and the second outflow passage 24b. In addition, for the contact portion between the first opening end 25a of the first outflow passage 24a and the second opening end 25b of the second outflow passage 24b and the sealing member 30, that is, the first sealing portion and the second sealing portion, a shape without corners (or with fewer corners) such as a circular shape is adopted, so that it becomes easy to achieve uniform sealing of the sealing portion over the entire circumference.

[0078] Figure 6 and Figure 7 Respectively Figure 2 The first sealing part and the second sealing part shown in FIG. are enlarged and schematically shown in a partial cross-sectional view. Figure 6 As shown, the first opening end 25a has a protrusion 46 throughout the entire circumference, and the sealing member 30 has a thin groove for accommodating the protrusion 46. The first opening end 25a contacts the sealing member 30 at the protrusion 46. In this way, the sealing performance of the first sealing portion can be improved by limiting the contact area between the first opening end 25a and the sealing member 30 to a linear shape and increasing the contact pressure. In order to obtain the same effect, it is also possible to form a thin groove at the first opening end 25a, and form a protrusion embedded in the thin groove throughout the entire circumference on the sealing member 30. In addition, such a combination of a protrusion and a thin groove can also be applied to the second sealing portion.

[0079] like Figure 7 As shown, at the second opening end 25b, a tapered surface 48 is formed, and the inner diameter of the tapered surface 48 becomes smaller toward the inside of the second outflow path 24b. The tapered surface 48 is arranged throughout the entire circumference of the second opening end 25b. As described above, the sealing member 30 has a convex curved surface 50 toward the second outflow path 24b. The sealing member 30 contacts the tapered surface 48 at the convex curved surface 50. As a result, the second opening end 25b can be in linear contact along the circumferential direction at the sealing member 30 and the convex curved surface 50, and the contact pressure can be increased compared with the case where the contact surface of the sealing member 30 and the second opening end 25b is set as a flat surface and performs surface contact. The increase in contact pressure will lead to an improvement in the sealing performance of the second sealing portion.

[0080] Since the second opening end 25b is provided with the tapered surface 48, when the cleaning device 10 is in operation, when the sealing member 30 is separated from the tapered surface 48, the inflowing cleaning liquid can be guided to the inside of the second outflow path 24b along the tapered surface 48. Compared with the case where the tapered surface 48 is not provided, it is easier to ensure the flow path between the sealing member 30 and the second opening end 25b.

[0081] Figure 82 is a schematic diagram for explaining the effect of the water receiving recess 42 provided in the branching tool 20. As described above, the water receiving recess 42 is provided in the outer peripheral portion 28b of the cover member 28 of the branching tool 20. The water receiving recess 42 extends in a groove-like manner to surround the periphery of the communicating hole 40. Figure 8 As shown, sometimes, during use, water droplets 52 may adhere to the surface of the branching tool 20 due to condensation, for example. As shown by arrow 53, even if the attached water droplets 52 approach the connecting hole 40, they will be blocked by being received in the water receiving recess 42. It is possible to suppress the water droplets 52 from entering the receiving chamber 34, that is, the interior of the branching tool 20.

[0082] Assuming that the water drop 52 reaches the communicating hole 40, the water drop 52 blocks the communicating hole 40, hindering the communication between the receiving chamber 34 and the outside air, or the water drop 52 penetrates into the receiving chamber 34, thereby hindering the operation of the sealing member 30. However, in this embodiment, as described above, the water receiving recess 42 is provided around the communicating hole 40, so it is difficult for the water drop 52 to penetrate into the inside of the branching device 20 and hinder the operation of the one-way valve.

[0083] Furthermore, the water receiving recess 42 extends in a groove shape so as to surround the periphery of the communicating hole 40, and substantially the entire periphery of the communicating hole 40 is surrounded by the water receiving recess 42. Therefore, when the water drop 52 flows toward the communicating hole 40 from the periphery, the possibility of entering the water receiving recess 42 before reaching the communicating hole 40 becomes high. Therefore, the approach of the water drop 52 to the communicating hole 40 and even the infiltration of water into the inside of the one-way valve are more effectively suppressed.

[0084] The central portion 28a of the cover member 28 is recessed upward relative to the outer peripheral portion 28b, and the communicating hole 40 penetrates from the receiving chamber 34 to the central portion 28a. Therefore, even if a water droplet 52 passes through the water receiving recess 42 toward the central portion 28a of the cover member 28, it is difficult for the water droplet 52 to go around the central portion 28a due to the effect of gravity. Therefore, the approach of the water droplet 52 to the communicating hole 40 and even the infiltration of water into the inside of the one-way valve are more effectively suppressed.

[0085] In the above-mentioned embodiment, the inflow path 22, the first outflow path 24a and the second outflow path 24b of the branching device 20 form a "Y"-shaped cleaning liquid flow path, but the flow path of the branching device 20 can be arranged in various geometric configurations. For example, it is also possible that the first outflow path 24a and the second outflow path 24b are not arranged on the same side relative to the central axis 36, but extend to opposite sides relative to the central axis 36. Alternatively, it is also possible that the inflow path 22 is not arranged radially outside relative to the first opening end 25a and the second opening end 25b, but is connected to the center of the branching device 20 like the second outflow path 24b in the above-mentioned embodiment.

[0086] In the above-mentioned embodiment, the second opening end 25b is arranged concentrically inside the first opening end 25a, but these opening ends can also be arranged in other ways. For example, the first opening end 25a and the second opening end 25b may be arranged adjacent to each other instead of one surrounding the other.

[0087] In the above-mentioned embodiment, the case where the main body 26 of the forking device 20 has two outflow paths is used as an example for explanation, but it may also be that the main body 26 has three or more outflow paths. Therefore, the main body of the forking device with a one-way valve may also include an inflow path and a plurality of (for example, more than three) outflow paths. In this case, the plurality of outflow paths respectively have an open end, and the cleaning fluid from the inflow path flows into the outflow path from the open end of each outflow path. The sealing member is mounted on the main body and is configured to allow the flow of the cleaning fluid from the inflow path to the plurality of outflow paths when the cleaner device is in operation. In addition, the sealing member is configured to seal the backflow of the cleaning fluid from the plurality of outflow paths to the inflow path by contacting the open end of each outflow path when the cleaner device is not in operation, and to seal the flow of the cleaning fluid between the plurality of outflow paths.

[0088] In the above-mentioned embodiment, the cleaning device 10 is described as having one branching tool 20, but the cleaning device 10 may also have a plurality of branching tools 20. In this case, an outflow path of a certain branching tool 20 may be connected to an inflow path of another branching tool 20. By doing so, more cleaning nozzles 14 can be provided in the cleaning device 10 by connecting a plurality of branching tools 20.

[0089] Next, refer to Fig. 9 and Fig.10 , another embodiment of the one-way valve 60 is described. Fig. 9 , a perspective view of the one-way valve 60 viewed from the bottom is shown. Fig.10 In FIG. 1 , a longitudinal cross-sectional view of the one-way valve 60 is shown. Fig.10 , a cross-section of the one-way valve 60 formed by a plane including the central axis 36 of the one-way valve 60 and the pipe axis of the inflow path 22 perpendicular thereto is shown.

[0090] The one-way valve 60 has one inflow path 22 and one outflow path 24. Therefore, the one-way valve 60 is not configured as a branching device for the cleaning fluid. Figure 1 The supply pipe 15, the connecting pipe 16, or both of the cleaning device 10 shown can be used to prevent the backflow of the cleaning liquid. In this case, in the cleaning device 10, a branch pipe without a check valve function can be used to divert the cleaning liquid to the plurality of cleaning nozzles 14 instead of the branching device 20.

[0091] The check valve 60 includes a main body 26, a cover member 28, a sealing member 30, and a biasing member 32. The main body 26 is provided with an inflow path 22 and an outflow path 24 having an open end 25. Although not particularly limited, the inflow path 22 is arranged on one side and the outflow path 24 is arranged on the other side relative to the central axis 36, and the inflow path 22 and the outflow path 24 form a cleaning liquid flow path extending in a straight line.

[0092] The main body 26 has an upper plate portion 26a, an upper side wall 26b, a lower side wall 26c, and an inner wall 26g, and each part of these main bodies 26 is formed integrally. The inner wall 26g extends downward from the upper plate portion 26a in a manner that the upper space in the one-way valve 60 surrounded by the upper plate portion 26a, the upper side wall 26b and the sealing member 30 is divided into two chambers. The lower end of the inner wall 26g is equivalent to the open end 25. The inner wall 26g is arranged between the inflow path 22 and the outflow path 24 in the upper space in the one-way valve 60. Therefore, on one side of the inner wall 26g, an outlet chamber 62 of the inflow path 22 is formed, and on the other side of the inner wall 26g, an inlet chamber 64 of the outflow path 24 is formed. For convenience, for the one-way valve 60, from the perspective of commonality of components, a sealing component 30 (having a convex curved surface in the center of the upper surface) that is common to the above-mentioned branching device 20 is used, so the inner wall 26g is arranged on the inflow path 22 side avoiding the convex curved surface of the sealing component 30.

[0093] The cover member 28 also uses a common component with the above-mentioned fork 20. Therefore, the cover member 28 is combined with the main body 26 to form a cavity in the fork 20, and the cavity is used as a storage chamber 34 for the sealing member 30 and the urging member 32. The sealing member 30 and the urging member 32 are sandwiched and held between the main body 26 and the cover member 28 at their outer peripheral edges.

[0094] In addition, the cover member 28 has a central portion 28a and a peripheral portion 28b, by which the bottom surface of the fork 20 is formed. The bottom surface has a shape in which the central portion 28a is recessed upward relative to the peripheral portion 28b. The cover member 28 has at least one (in this example, four) communication holes 40 that connect the storage chamber 34 to the outside, and the communication holes 40 penetrate the cover member 28 from the storage chamber 34 to the central portion 28a of the bottom surface.

[0095] The cover member 28 is provided with a water receiving recess 42, which is arranged around the communicating hole 40. The water receiving recess 42 extends in a groove shape so as to surround the communicating hole 40. The water receiving recess 42 is formed along the outer peripheral portion 28b of the cover member 28. As shown in the figure, the water receiving recess 42 is formed into a plurality of (in Figure 4In the embodiment, the grooves are divided in the circumferential direction, for example, six grooves, but may be continuous grooves throughout the entire circumference. In addition, the water receiving recess 42 may be provided in the main body 26, for example, at a location surrounding the cover member 28, for example, at the bottom surface of the lower side wall 26c, instead of or in addition to the water receiving recess 42 provided in the cover member 28.

[0096] The sealing member 30 is configured to act as a valve body of the one-way valve 60, and when the cleaning device 10 is in operation, the sealing member 30 is separated from the opening end 25, thereby allowing the flow of the cleaning liquid from the inlet path 22 to the outlet path 24, and when the cleaning device 10 is not in operation, the sealing member 30 is in contact with the opening end 25, thereby sealing the reverse flow of the cleaning liquid from the outlet path 24 to the inlet path 22. The sealing member 30 is elastically supported by the urging member 32, and the urging member 32 is provided as a return spring, and the return spring elastically urging the sealing member 30 as a valve body to the original sealing position. The urging member 32 also uses a common component with the above-mentioned branching device 20.

[0097] When the cleaning device 10 is in operation, the cleaning liquid first flows into the outlet chamber 62 ( Fig.10 Due to the pressure of the inflowing cleaning liquid, the sealing member 30 is deformed or displaced downward relative to the main body 26 and moves away from the opening end 25, and the one-way valve 60 is switched from the closed state to the open state. The cleaning liquid flows into the inlet chamber 64 of the outflow path 24 through the gap formed between the opening end 25 and the upper surface of the sealing member 30, and flows out of the main body 26 through the outflow path 24 ( Fig.10 In this way, the one-way valve 60 can allow the cleaning liquid to flow from the inflow path 22 to the outflow path 24.

[0098] On the other hand, when the cleaning device 10 is not in operation, the inflow of the cleaning liquid from the inflow path 22 is stopped, and the pressure of the cleaning liquid acting on the sealing member 30 is reduced. Due to the elastic restoring force of the sealing member 30 itself and the elastic restoring force acting on the sealing member 30 from the force member 32, the sealing member 30 and the force member 32 are deformed or displaced upward relative to the main body 26. In this way, the sealing member 30 contacts the opening end 25 again, and the one-way valve 60 switches from the open state to the closed state. Therefore, the one-way valve 60 can seal the backflow of the cleaning liquid from the outflow path 24 to the inflow path 22.

[0099] In addition, the check valve 60 is provided with a water receiving recess 42 around the communication hole 40, similarly to the branching device 20. Therefore, even if water droplets adhere to the check valve 60 due to condensation, the water droplets can be prevented from entering the check valve 60 through the communication hole 40.

[0100] In addition, the one-way valve 60 has one inflow path 22, but the one-way valve 60 may have a plurality of inflow paths instead. In this case, the one-way valve 60 may be configured as a confluence portion having a plurality of inflow paths and at least one outflow path (for example, one outflow path).

[0101] The present invention is not limited to the above-mentioned embodiments and variations, and the embodiments and variations can be combined, or further modified such as various design changes can be made based on the knowledge of those skilled in the art, and such combined or further modified embodiments or variations are also included in the scope of the present invention. New embodiments generated by the above-mentioned embodiments or variations, and the combination of the above-mentioned embodiments or variations with the following variations have the effects of the combined embodiments, variations, and further variations.

[0102] In the above-mentioned embodiment, the case where the cleaning fluid is cleaning liquid is described as an example, but the cleaning fluid may be gas such as air.

[0103] In the above-mentioned embodiment, the cleaning device for a vehicle is described as an example, but the cleaning device of the embodiment of the present invention is not limited to such a specific device. Therefore, the cleaning device of the embodiment can be mounted on outdoor lighting equipment such as street lamps, sensor equipment or other various equipment, and can also be used to clean various objects to be cleaned set in such equipment.

[0104] Although the present invention has been described using specific words based on the implementation mode, the implementation mode only shows one aspect of the principle and application of the present invention. In the implementation mode, many variations or configurations are allowed to be changed without departing from the scope of the idea of ​​the present invention defined in the claims.

[0105] [Industrial Applicability]

[0106] The present invention can be used for a one-way valve, a branching tool with a one-way valve, and a cleaning device.

[0107] [Explanation of Reference Numerals]

[0108] 10 cleaning device, 11 object to be cleaned, 14 cleaning nozzle, 20 branching device, 22 inflow path, 24a first outflow path, 24b second outflow path, 25a first opening end, 25b second opening end, 26 main body, 28 cover member, 30 sealing member, 34 storage chamber, 40 communicating hole, 42 water receiving recess, 48 ​​tapered surface.

Claims

1. A one-way valve, which is used for assembly in a cleaning device; The one-way valve is characterized by comprising: A main body, comprising an inflow path and at least one outflow path, a sealing member configured to allow the flow of the cleaning fluid from the inflow path to the outflow path when the cleaning device is in operation, and to seal the backflow of the cleaning fluid from the outflow path to the inflow path when the cleaning device is not in operation, and a cover member, which is combined with the main body to form a housing chamber for the sealing member; The cover member has a communication hole, which allows the receiving chamber to communicate with the outside; The cover member or the main body is provided with a water receiving recess, which is arranged around the communicating hole. The cover member forms a bottom surface of the one-way valve having a central portion and an outer peripheral portion, and the communication hole penetrates from the accommodation chamber to the central portion of the bottom surface; The central portion of the bottom surface is recessed upward relative to the outer peripheral portion.

2. The one-way valve according to claim 1, characterized in that: The water receiving recessed portion extends in a groove shape so as to surround the periphery of the communicating hole.

3. The one-way valve according to claim 1 or 2, characterized in that: The main body includes a plurality of outflow paths; The sealing member is configured to seal a backflow of the cleaning fluid from the plurality of outflow passages to the inflow passage and to seal a flow of the cleaning fluid between the plurality of outflow passages when the cleaning device is not in operation.

4. A cleaning device, characterized in that: include: The one-way valve according to claim 1 or 2, and The cleaning nozzle is configured to spray the cleaning fluid toward the object to be cleaned and is connected to the outflow passage of the one-way valve.

5. A cleaning device as claimed in claim 4, characterized in that The cleaning device is mounted on a vehicle, and the object to be cleaned is a vehicle-mounted device.

6. A fork with a one-way valve, which is used for assembly in a cleaning device; The bifurcated device with a one-way valve is characterized by comprising: A main body, comprising an inlet passage, a first outlet passage having a first opening end, and a second outlet passage having a second opening end, wherein the cleaning fluid from the inlet passage flows from the first opening end into the first outlet passage, and flows from the second opening end into the second outlet passage, and a sealing member mounted on the main body and configured to allow the cleaning fluid to flow from the inlet passage to the first outlet passage and the second outlet passage when the cleaning device is in operation; The sealing member is configured to seal the backflow of the cleaning fluid from the first outflow path and the second outflow path to the inflow path and to seal the flow of the cleaning fluid between the first outflow path and the second outflow path by contacting the first opening end and the second opening end when the cleaning device is not in operation. The bifurcated tool further includes a cover member, which is combined with the main body to form a housing chamber for the sealing member; The cover member has a communication hole, which allows the receiving chamber to communicate with the outside; The cover member or the main body is provided with a water receiving recess, which is arranged around the communicating hole. The cover member forms a bottom surface of the one-way valve having a central portion and an outer peripheral portion, and the communication hole penetrates from the accommodation chamber to the central portion of the bottom surface; The central portion of the bottom surface is recessed upward relative to the outer peripheral portion.

7. The bifurcated device with a one-way valve according to claim 6, characterized in that: The second opening end is arranged on the inner side with respect to the first opening end.

8. The bifurcated device with a one-way valve according to claim 6 or 7, characterized in that: The second opening end has a tapered surface whose inner diameter decreases toward the inner side of the second outflow path, and the sealing member is in contact with the tapered surface.

9. The bifurcated device with a one-way valve according to claim 8, characterized in that: The sealing member has a convex curved surface facing the second outflow passage, and the curved surface is in contact with the tapered surface.

10. The bifurcated device with a one-way valve according to claim 6 or 7, characterized in that: The inflow channel is arranged outside the first opening end and the second opening end.

11. The bifurcated device with a one-way valve according to claim 6 or 7, characterized in that: The inflow channel, the first outflow channel, and the second outflow channel are arranged in a concentric circle shape.

12. A cleaning device, characterized in that: include: The bifurcated device with a one-way valve according to claim 6 or 7, and At least one cleaning nozzle is configured to spray a cleaning fluid toward the object to be cleaned and is connected to at least one of the first outflow passage and the second outflow passage of the branching device with a one-way valve.

13. A cleaning device as claimed in claim 12, characterized in that The cleaning device is mounted on a vehicle, and the object to be cleaned is a vehicle-mounted device.

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