Flow path switching device and vehicle cleaning device

Abstract

To provide a flow passage switching device capable of simplifying a configuration.SOLUTION: A vehicle cleaning device 20 which is a flow passage switching device is capable of switching between a first nozzle N1 and a second nozzle N2 through which fluid supplied from a drive pump P is output. The vehicle cleaning device 20 has a switch valve 21 which switches from one of the first nozzle N1 and the second nozzle N2 to the other thereof when pressure inside a passage corresponding to the one of the first nozzle N1 and the second nozzle N2 is reduced along with output of the fluid therethrough.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a flow path switching device and a vehicle cleaning device. [Background technology]

[0002] In recent years, vehicles may be provided with multiple sensors to grasp the surrounding situation. The sensor has a sensing surface (for example, an outer surface of a lens or a cover glass) exposed to the outside of the vehicle. Therefore, there is a risk that foreign matter such as raindrops may adhere to the sensing surface. A system including a sensor may not function normally when foreign matter adheres to the sensing surface. Therefore, each of the sensing surfaces of the sensors needs to be cleaned. In this way, a vehicle may have multiple cleaning targets. Therefore, for example, a vehicle cleaning device provided in a vehicle has an electromagnetic valve that switches the flow path by operating a switch (for example, see Patent Document 1). In such a vehicle cleaning device, it is possible to spray a fluid supplied from a single drive pump onto two cleaning targets, respectively. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-182080 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the flow path switching device for the above-mentioned vehicle cleaning device or the like requires a solenoid valve, electric wires connected to the solenoid valve, a control unit for controlling the solenoid valve, etc. Therefore, there is a problem that the device becomes complicated.

[0005] The present invention has been made to solve the above problems, and an object of the present invention is to provide a flow path switching device and a vehicle cleaning device that enable a simplified configuration. [Means for solving the problem]

[0006] The flow path switching device (20) that solves the above problem is a flow path switching device that can switch between a first output section (N1) and a second output section (N2) and output a fluid (CA1) supplied from a drive pump (P), and is equipped with a switching valve (21) that switches the flow of the fluid to the other of the first output section and the second output section by reducing the pressure in the corresponding flow path due to the output of the fluid from either the first output section or the second output section.

[0007] According to this configuration, the pressure in the corresponding flow path is reduced by the output of the fluid from either the first output part or the second output part, and the flow of the fluid is switched to the other of the first output part and the second output part. Therefore, the fluid supplied from a single drive pump can be mechanically switched and output from the first output part and the second output part. Therefore, the configuration can be simplified compared to a flow path switching device equipped with a solenoid valve or the like.

[0008] A vehicle cleaning device that solves the above problem comprises the above flow path switching device, wherein the first output portion is a first nozzle for spraying the fluid onto a first object to be cleaned (11a), and the second output portion is a second nozzle for spraying the fluid onto a second object to be cleaned (12a).

[0009] According to this configuration, the pressure in the corresponding flow path is reduced by ejecting the fluid from either the first nozzle or the second nozzle, and the flow of the fluid is switched to the other of the first nozzle and the second nozzle. Therefore, the fluid supplied from the single drive pump can be ejected by switching between the first nozzle and the second nozzle. Therefore, the configuration can be simplified compared to a vehicle cleaning device equipped with an electromagnetic valve or the like. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic configuration diagram of a vehicle cleaning device according to an embodiment; [Diagram 2]1 is a perspective view of a vehicle cleaning device according to an embodiment; [Diagram 3] 1 is a cross-sectional view of a vehicle cleaning device according to an embodiment; [Figure 4] FIG. 2 is a cross-sectional view of a switching valve according to one embodiment. [Diagram 5] 4 is a cross-sectional view used to explain the operation of a switching valve in one embodiment. FIG. [Figure 6] FIG. 3 is a cross-sectional view of a first accumulator valve, a second accumulator valve, and the like in one embodiment. [Figure 7] FIG. 2 is a partially sectional perspective view of a first pressure accumulator valve and a second pressure accumulator valve in one embodiment. [Figure 8] 4 is a cross-sectional view used to explain the operation of a first pressure accumulator valve and a second pressure accumulator valve in one embodiment. FIG. [Figure 9] 4 is a cross-sectional view used to explain the operation of a first pressure accumulator valve and a second pressure accumulator valve in one embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, one embodiment of a vehicle cleaning device will be described with reference to Figs. (Vehicle 10 Configuration) As shown in Fig. 1, a first distance measurement sensor 11 is installed in the center of the front end of a vehicle 10, and a second distance measurement sensor 12 is installed in the center of the rear end. The first distance measurement sensor 11 and the second distance measurement sensor 12 are configured using optical sensors that emit and receive light of a predetermined wavelength toward the front and rear of the vehicle 10, respectively. The first distance measurement sensor 11 and the second distance measurement sensor 12 are used in distance measurement systems (such as LIDAR) that measure the distance between the vehicle and an object in front of the vehicle and an object in rear of the vehicle, respectively, and are used in systems that perform advanced driving assistance, autonomous driving, etc. of the vehicle 10.

[0012] The first distance measurement sensor 11 and the second distance measurement sensor 12 have their own sensing surfaces (e.g., outer surfaces of lenses, cover glass, etc.) 11a, 12a exposed to the outside of the vehicle 10. Since foreign matter such as raindrops that may reduce distance measurement accuracy may adhere to the sensing surfaces 11a, 12a, the vehicle 10 is equipped with a vehicle cleaning device 20 that cleans and removes foreign matter adhered to the sensing surfaces 11a, 12a. In this embodiment, the sensing surface 11a of the first distance measurement sensor 11 is the first cleaning target, and the sensing surface 12a of the second distance measurement sensor 12 is the second cleaning target.

[0013] (Configuration of the vehicle cleaning device 20) 2 and 3, the vehicle cleaning device 20 is configured to be able to switch between outputting the fluid supplied from the drive pump P from a first nozzle N1 as a first output section and a second nozzle N2 as a second output section. The vehicle cleaning device 20 includes a switching valve 21 that switches the flow of the fluid to the other of the first nozzle N1 and the second nozzle N2 by reducing the pressure in the corresponding flow path due to the output of the fluid from either the first nozzle N1 or the second nozzle N2. In more detail, the vehicle cleaning device 20 includes the drive pump P, the first nozzle N1, the second nozzle N2, the switching valve 21, a branching section 22, a first check valve 23, a second check valve 24, a first storage section 25, a second storage section 26, a first accumulator valve 27, and a second accumulator valve 28.

[0014] (Configuration of drive pump P) The drive pump P is configured with an electric air pump, such as a gear pump, which is a positive displacement pump capable of generating compressed air CA1 as a fluid.

[0015] (Configuration of branching portion 22) The branching portion 22 has a source opening 22a, a first flow path opening 22b, and a second flow path opening 22c that are in communication with each other. The source opening 22a of the branching portion 22 is connected to the drive pump P via a connection hose 29a. The branching portion 22 branches a source flow path R0 of the compressed air CA1 supplied from the drive pump P into a first flow path R1 side and a second flow path R2 side.

[0016] (Configuration of First Check Valve 23 and Second Check Valve 24) The first check valve 23 and the second check valve 24 each have, for example, a sphere and a spring therein and prevent the compressed air CA1 from flowing back toward the branching portion 22. The first check valve 23 is connected to a first passage opening 22b of the branching portion 22 via a connection hose 29b. The second check valve 24 is connected to a second passage opening 22c of the branching portion 22 via a connection hose 29c.

[0017] (Configuration of first storage section 25 and second storage section 26) The first storage section 25 and the second storage section 26 are formed, for example, in a bottomed cylindrical shape and are capable of storing a predetermined volume of compressed air CA1. The first storage section 25 and the second storage section 26 are formed, for example, in a volume larger than the volume of each hose when the first check valve 23 and the second check valve 24 are directly connected to the switching valve 21 by the connection hose. The first storage section 25 is connected to the first check valve 23 via a connection hose 29d. The second storage section 26 is connected to the second check valve 24 via a connection hose 29e.

[0018] (Configuration of switching valve 21) As shown in FIG. 4, the switching valve 21 has a first divided body 41, a second divided body 42, and a switching diaphragm 43 serving as a switching valve body.

[0019] The first divided body 41 is for forming the first inlet 44, the first outlet 45, and the first valve chamber 46. The second divided body 42 is for forming the second inlet 47, the second outlet 48, and the second valve chamber 49. The switching diaphragm 43 is interposed so as to separate the first valve chamber 46 and the second valve chamber 49, and is for blocking the flow of compressed air CA1 to the first outlet 45 or the second outlet 48 depending on the pressure difference between the first valve chamber 46 and the second valve chamber 49. In other words, the switching diaphragm 43 is for allowing the flow of compressed air CA1 to the first outlet 45 or the second outlet 48 depending on the pressure difference between the first valve chamber 46 and the second valve chamber 49.

[0020] In detail, the first divided body 41 is made of resin and has a main body portion 41a, an extension portion 41b, a first inflow tubular portion 41c, a first inner extension tubular portion 41d, and a first outer extension tubular portion 41e. The main body portion 41a is formed in a generally bottomed tubular shape. The extension portion 41b extends radially outward from the opening of the main body portion 41a. The first inflow tubular portion 41c is formed to protrude cylindrically from a part of the outer periphery of the main body portion 41a, and is formed to communicate the outside and the inside of the main body portion 41a. The first inner extension tubular portion 41d is formed to protrude cylindrically from the center of the bottom of the main body portion 41a toward the inside of the main body portion 41a, that is, to protrude cylindrically toward the inside of the first valve chamber 46. The first outer extension tubular portion 41e is formed to protrude cylindrically from the center of the bottom of the main body portion 41a toward the outside of the main body portion 41a. The first inner extension tube portion 41d and the first outer extension tube portion 41e are connected to each other on the same straight line. In this embodiment, an opening formed at the tip of the first inlet tube portion 41c is a first inlet port 44. In this embodiment, an opening formed at the tip of the first outer extension tube portion 41e is a first outlet port 45.

[0021] The second division body 42 is made of resin and has the same shape as the first division body 41, and includes a main body portion 42a, an extension portion 42b, a second inflow tubular portion 42c, a second inner extension tubular portion 42d, and a second outer extension tubular portion 42e. The main body portion 42a is formed in a generally bottomed tubular shape. The extension portion 42b extends radially outward from the opening of the main body portion 42a. The second inflow tubular portion 42c is formed to protrude cylindrically from a part of the outer periphery of the main body portion 42a, and is formed to communicate the outside and inside of the main body portion 42a. The second inner extension tubular portion 42d is formed to protrude cylindrically from the center of the bottom of the main body portion 42a toward the inside of the main body portion 42a, that is, to protrude cylindrically toward the inside of the second valve chamber 49. The second outer extension tubular portion 42e is formed to protrude cylindrically from the center of the bottom of the main body portion 42a toward the outside of the main body portion 42a. The second inner extension tube portion 42d and the second outer extension tube portion 42e are connected to each other on the same straight line. In this embodiment, an opening formed at the tip of the second inlet tube portion 42c is a second inlet port 47. In this embodiment, an opening formed at the tip of the second outer extension tube portion 42e is a second outlet port 48.

[0022] The switching diaphragm 43 is formed in a substantially circular disk shape from a flexible material such as rubber. The switching diaphragm 43 is formed by continuously and integrally molding a thick outer peripheral edge portion 43a, a ring-shaped thin-walled portion 43b formed inside the outer peripheral edge portion 43a, and a thick disk-shaped central valve body 43c formed in the center inside the thin-walled portion 43b.

[0023] The first division body 41, the second division body 42, and the switching diaphragm 43 are assembled by fitting and fixing the outer extensions 41b, 42b together so that the switching diaphragm 43 is interposed therebetween. That is, the outer peripheral edge 43a of the switching diaphragm 43 is sandwiched between the outer extensions 41b, 42b. The insides of the main bodies 41a, 42a of the first division body 41 and the second division body 42 are partitioned by the switching diaphragm 43, respectively, to partition the first valve chamber 46 and the second valve chamber 49, and fluid cannot flow between the two chambers. The central valve body 43c is displaced inside the switching valve 21 to close the opening at the tip of the first inner extension tube portion 41d or the opening at the tip of the second inner extension tube portion 42d, thereby blocking the flow of compressed air CA1 to the first discharge port 45 or the second discharge port 48. In other words, the central valve body 43c is capable of selectively blocking the flow of compressed air CA1 to the first discharge port 45 and the second discharge port 48 by closing one of the openings at the tip of the first internal extension tube portion 41d and the opening at the tip of the second internal extension tube portion 42d and opening the other.

[0024] The first inlet tube portion 41c of the switching valve 21, i.e., the first introduction port 44, is connected to the first storage portion 25 via a connection hose 29f. The second inlet tube portion 42c of the switching valve 21, i.e., the second introduction port 47, is connected to the second storage portion 26 via a connection hose 29g.

[0025] (Configuration of the first accumulator valve 27 and the second accumulator valve 28) The first pressure accumulator valve 27 and the second pressure accumulator valve 28 are configured to open at a pressure higher than the discharge pressure of the drive pump P. Since the first pressure accumulator valve 27 and the second pressure accumulator valve 28 have the same configuration, the first pressure accumulator valve 27 will be described in detail, and a detailed description of the second pressure accumulator valve 28 will be omitted.

[0026] 6 and 7, the first pressure accumulator valve 27 includes a base member 31, a cover member 32, a diaphragm 33, and biasing springs 34, 35. Of these components, a part of the base member 31, the cover member 32, the diaphragm 33, and the biasing springs 34, 35 configure the valve main body 30. Hereinafter, the base member 31 will be described as being on the lower side and the cover member 32 as being on the upper side, but the orientation of the first pressure accumulator valve 27 during use is not limited to this.

[0027] The base member 31 is made of resin and has a base portion 31a at its upper portion and a connection portion 31b at its lower portion. The base portion 31a constitutes the lower portion of the housing of the valve main body 30 and has a circular bottom wall portion 31c and an annular side wall portion 31d standing upward from the peripheral portion of the bottom wall portion 31c. In contrast, the cover member 32 constitutes the upper portion of the housing of the valve main body 30 and has a circular upper wall portion 32a and an annular side wall portion 32b extending downward from the peripheral portion of the upper wall portion 32a. The base member 31 and the cover member 32 are assembled such that the upper end surface of the side wall portion 31d and the lower end surface of the side wall portion 32b abut against each other, and the peripheral portion 33x of the diaphragm 33 is sandwiched between the end faces, and a seal is achieved by sandwiching the peripheral portion 33x. The diaphragm 33 defines a space formed by itself and the bottom wall portion 31c and side wall portion 31d of the base portion 31a as a valve chamber 36, and a space formed by the upper wall portion 32a and side wall portion 32b of the cover member 32 as a back pressure chamber 37.

[0028] The connection part 31b is provided on the lower surface side of the base part 31a, and extends downward from the bottom wall part 31c of the base part 31a, and then forms an inverted T shape that branches into two. One side of the connection part 31b is the pump side connection part 31e, and the other side of the connection part 31b is the nozzle side connection part 31f. The introduction flow path 38 formed inside the pump side connection part 31e and the discharge flow path 39 formed inside the nozzle side connection part 31f are independent of each other. The openings 38a, 39a of the introduction flow path 38 and the discharge flow path 39 are formed in the approximate center of the bottom wall part 31c of the base part 31a. The openings 38a, 39a are shaped to protrude slightly cylindrically from the bottom surface of the bottom wall part 31c.

[0029] The diaphragm 33 is made of a flexible material such as rubber and has a substantially circular plate shape, and has substantially cylindrical valve bodies 33a and 33b at positions facing the openings 38a and 39a of the inlet flow path 38 and the outlet flow path 39 at the substantially central portion. The diaphragm 33 is configured such that the portions of the diaphragm 33 excluding the valve bodies 33a and 33b and the peripheral portion 33x, i.e., between the valve bodies 33a and 33b and between the valve bodies 33a and 33b and the peripheral portion 33x, are configured as thin-walled portions 33c that are thinner than the valve bodies 33a and 33b and the peripheral portion 33x. In other words, the diaphragm 33 is configured such that the valve bodies 33a and 33b connected to the peripheral portion 33x via the thin-walled portions 33c are displaceable relative to the fixed peripheral portion 33x, and the valve bodies 33a and 33b are also displaceable independently of each other. As a result of this displacement movement of each valve body 33a, 33b, the valve body 33a abuts against or moves away from an opening 38a of the inlet flow path 38 to open and close that flow path, and the valve body 33b abuts against or moves away from an opening 39a of the outlet flow path 39 to open and close that flow path.

[0030] The cover member 32 is made of resin and has protrusions 32c, 32d at positions on the upper wall 32a facing the valve bodies 33a, 33b. The protrusions 32c, 32d are protrusions for regulating the positions of the urging springs 34, 35 made of compression coil springs, and the upper sides of the urging springs 34, 35 are fitted onto the protrusions 32c, 32d. The upper ends of the urging springs 34, 35 abut against the upper wall 32a. In contrast, the lower ends of the urging springs 34, 35 abut against the valve bodies 33a, 33b. In other words, the urging springs 34, 35 urge the valve bodies 33a, 33b downward from the upper wall 32a, that is, urge the valve bodies 33a, 33b toward the openings 38a, 39a of the introduction flow path 38 and the discharge flow path 39. The biasing force of the biasing spring 35 is set to be relatively smaller than the biasing force of the biasing spring 34. Furthermore, the upper wall portion 32a has, at a position outside the protrusions 32c, 32d, for example, two communication holes 32e that communicate with the back pressure chamber 37 and the outside of the cover member 32 (open to the atmosphere) so that the displacement operation of the valve bodies 33a, 33b is not affected by the pressure in the back pressure chamber 37.

[0031] The first accumulator valve 27 and the second accumulator valve 28 are configured in this manner. Furthermore, the valve body 30 of the first accumulator valve 27 and the second accumulator valve 28 is configured such that the valve body 33a side on the introduction flow path 38 side is the first valve portion 30a, and the valve body 33b side on the discharge flow path 39 side is the second valve portion 30b. The detailed operations of the first accumulator valve 27 and the second accumulator valve 28 will be described later.

[0032] The first accumulator valve 27 has a pump side connection portion 31e connected to the first outer cylindrical portion 41e of the switching valve 21 via a connection hose 29h. The first accumulator valve 27 has a nozzle side connection portion 31f connected to the first nozzle N1 via a connection hose 29j.

[0033] Moreover, the second accumulator valve 28 has a pump side connection portion 31e connected to the second outer cylindrical portion 42e of the switching valve 21 via a connection hose 29k. Moreover, the second accumulator valve 28 has a nozzle side connection portion 31f connected to the second nozzle N2 via a connection hose 29l.

[0034] (Configuration of the First Nozzle N1 and the Second Nozzle N2) The first nozzle N1 is disposed with its nozzle N1a facing the sensing surface 11a (see FIG. 1) of the first distance measurement sensor 11. The first nozzle N1 is capable of injecting high-pressure, pulsating output air CA2 supplied from the first accumulator valve 27 toward the sensing surface 11a.

[0035] The second nozzle N2 is disposed such that its nozzle N2a faces the sensing surface 12a (see FIG. 1) of the second distance measurement sensor 12. The second nozzle N2 is capable of injecting high-pressure, pulsating output air CA2 supplied from the second accumulator valve 28 toward the sensing surface 12a.

[0036] The first accumulator valve 27 is preferably disposed in the vicinity of the first nozzle N1 in order to minimize piping loss to the first nozzle N1 of the output air CA2 generated by the first accumulator valve 27. Also, the connection hose 29j connecting the first accumulator valve 27 and the first nozzle N1 may be omitted, and the first accumulator valve 27 and the first nozzle N1 may be configured integrally.

[0037] Moreover, the second accumulator valve 28 is preferably disposed in the vicinity of the second nozzle N2 in order to minimize piping loss to the second nozzle N2 of the output air CA2 generated by the second accumulator valve 28. Moreover, the connection hose 29l connecting the second accumulator valve 28 and the second nozzle N2 may be omitted, and the second accumulator valve 28 and the second nozzle N2 may be configured integrally.

[0038] As shown in FIG. 1, the drive pump P is connected to an ECU (Electronic Control Unit) 50 and is controlled by the ECU 50. The operation and function of this embodiment will now be described.

[0039] For example, when the adhesion of foreign matter such as raindrops to the sensing surfaces 11a, 12a is detected, when a predetermined time has elapsed, or when a switch is operated, the drive pump P is driven via the ECU 50, and compressed air CA1 is output from the drive pump P.

[0040] The compressed air CA1 is continuously supplied to the switching valve 21 via the branching portion 22, the first check valve 23, the second check valve 24, the first storage portion 25, and the second storage portion 26. Then, in the switching valve 21, the central valve body 43c moves in accordance with the pressure difference between the first valve chamber 46 and the second valve chamber 49, blocking the flow of the compressed air CA1 to the first discharge port 45 or the second discharge port 48. Note that the central valve body 43c is initially disposed in a neutral position, and when a pressure difference occurs between the first valve chamber 46 and the second valve chamber 49 due to differences in the paths or the like, the central valve body 43c moves to one side to block the flow of the compressed air CA1 to the first discharge port 45 or the second discharge port 48.

[0041] For example, as shown in Fig. 5, when the pressure in the first valve chamber 46 increases, the central valve body 43c closes the opening at the tip of the second inner extension tube portion 42d to block the flow of the compressed air CA1 to the second discharge port 48 and allows the compressed air CA1 to flow to the first discharge port 45. When the central valve body 43c closes the second inner extension tube portion 42d, the pressure in the second inner extension tube portion 42d does not increase, so that the central valve body 43c does not return to the neutral position and maintains its position even if the pressure difference between the first valve chamber 46 and the second valve chamber 49 disappears. In other words, once the central valve body 43c closes the second inner extension tube portion 42d, the area in the second valve chamber 49 where the switching diaphragm 43 receives pressure becomes smaller, so that the central valve body 43c maintains its position until the difference in the "product of area and pressure" is reversed, even if the pressure difference between the chambers disappears. Then, when the central valve body 43c is in a state where it blocks the second inner extension cylindrical portion 42d, and the pressure in the second valve chamber 49 becomes significantly higher than the pressure in the first valve chamber 46, reversing the difference in the "product of area and pressure" described above, the central valve body 43c moves to block the opening at the tip of the first inner extension cylindrical portion 41d.

[0042] In the first accumulator valve 27 and the second accumulator valve 28, in an initial non-operated state, as shown in FIG. 6, the first valve portion 30a and the second valve portion 30b are in a completely closed state, i.e., the valve bodies 33a, 33b seal the openings 38a, 39a of the inlet flow path 38 and the outlet flow path 39, respectively.

[0043] Then, for example, as shown in FIG. 5, when the pressure in the first valve chamber 46 increases, the compressed air CA1 is permitted to flow to the first discharge port 45, and the compressed air CA1 is supplied to the first accumulator valve 27.

[0044] When the drive pump P is driven to continuously supply compressed air CA1, the valve body 33a is kept closed by the biasing force of the biasing spring 34, and the compressed air CA1 is stored in the first storage section 25 in an accumulated state. Then, the introduction side pressure P1 including the introduction flow path 38 and the connection hose 29h of the first accumulator valve 27 rises. At this time, the compressed air CA1 is also stored in the second storage section 26 in an accumulated state, but the compressed air CA1 is not supplied to the second accumulator valve 28. As shown in FIG. 7, in the first accumulator valve 27, the introduction side pressure P1 acts on a portion of the area S1 acting on the valve body 33a, that is, a relatively narrow portion of the area of ​​the opening 38a. The pushing force F1 acting on the valve body 33a is the product of the introduction side pressure P1 and the area S1, F1=P1×S1. The pressure P1 on the inlet side in the closed valve state is increased to a pressure sufficiently higher than the discharge pressure of the drive pump P. The discharge pressure of the drive pump P is the pressure in the flow path when the drive pump P is driven in a case where the drive pump P and the first nozzle N1 are directly connected by a connecting hose (hereinafter, simply referred to as the "discharge pressure of the drive pump P").

[0045] As the pressure P1 on the inlet side increases, a small gap is generated between the valve body 33a and the opening 38a in the first valve section 30a, as shown in FIG. 8, causing a small amount of compressed air CA1 to leak into the valve chamber 36 as CAx. Therefore, the pressure P2 in the valve chamber 36 also gradually increases. As shown in FIG. 7, the pressure P2 in the valve chamber 36 acts on a portion of the thin-walled portion 33c of the diaphragm 33 with an area S2 (area S1<area S2), that is, on a relatively wide portion of the entire area of ​​the thin-walled portion 33c excluding the areas of the openings 38a and 39a. In this case, the upward force F2 acting on the thin-walled portion 33c is the product of the pressure P2 in the valve chamber 36 and the area S2, F2=P2×S2. Since the area S2 of the thin portion 33c on which the pressure P2 acts is greater than the area S1 of the valve body 33a on which the pressure P1 acts, the influence of the upward force F2 is large even if the pressure P2 is lower than the pressure P1.

[0046] Then, when the pressure P1 on the introduction side and the pressure P2 in the valve chamber 36 both increase, the combined upward force F1 on the valve body 33a side and the upward force F2 on the thin-walled portion 33c side of the diaphragm 33, "F1+F2", exceeds a predetermined pressing force (both biasing forces of the biasing springs 34, 35). As a result, as shown in Fig. 9, the entire diaphragm 33 is largely displaced, and both the first valve portion 30a and the second valve portion 30b are opened. In other words, both the valve bodies 33a, 33b are separated from the openings 38a, 39a, and the introduction flow path 38, the valve chamber 36, and the discharge flow path 39 are in a conductive state.

[0047] The inlet pressure P1 immediately before the valve is opened is sufficiently higher than the discharge pressure of the drive pump P, and when the valve is opened, the high-pressure compressed air CA1 on the inlet passage 38 side flows in one go through the valve chamber 36 to the discharge passage 39. Therefore, the discharge pressure P3 increases suddenly. In other words, high-pressure air is supplied to the first nozzle N1 as output air CA2.

[0048] On the other hand, the pressure P1 on the inlet side of the first accumulator valve 27 drops suddenly, and after the pressure P3 on the discharge side matches the pressure P1 on the inlet side, both pressures P3 and P1 drop, and the diaphragm 33 switches from open to closed. That is, the pressure P2 in the valve chamber 36 also drops, and the biasing force of the biasing springs 34 and 35 exceeds the pushing force "F1+F2" of the diaphragm 33 based on both pressures P1 and P2, and each valve body 33a and 33b closes each opening 38a and 39a of the inlet flow passage 38 and the discharge flow passage 39. Based on the opening and closing operation of these valve bodies 33a and 33b, a high-pressure, pulsating output air CA2 is generated. As a result, the high-pressure, pulsating output air CA2 is sprayed from the first nozzle N1 to the sensing surface 11a of the first distance measuring sensor 11. Therefore, foreign matter such as raindrops that may adhere to the sensing surface 11a can be effectively removed and cleaned.

[0049] In addition, as described above, the pressure P1 on the introduction side of the first accumulator valve 27 is suddenly decreased, and the pressure in the first reservoir 25 and the first valve chamber 46 on the first flow path R1 side is also suddenly decreased. At this time, the second check valve 24 prevents the compressed air CA1 in the second valve chamber 49 and the second reservoir 26 from flowing back toward the branch portion 22 side. Then, the pressure in the second valve chamber 49 becomes significantly higher than the pressure in the first valve chamber 46, and the difference in the "product of area and pressure" described above is reversed, and the central valve body 43c moves to close the opening at the tip of the first inner extension tube portion 41d. The timing at which the central valve body 43c moves may vary slightly depending on various conditions such as the length of the connection hose 29h. For example, it may not necessarily be after the valve bodies 33a and 33b are closed, but may be before the valve bodies are closed. In this way, the flow of the compressed air CA1 is switched to the second accumulator valve 28 side by the switching valve 21.

[0050] Then, on the second flow path R2 side, the second accumulator valve 28 operates in the same manner as the first accumulator valve 27, and high-pressure, pulsating output air CA2 is sprayed from the second nozzle N2 to the sensing surface 12a of the second distance measurement sensor 12. Thus, foreign matter such as raindrops that may adhere to the sensing surface 12a is effectively removed and cleaned. Then, the flow of compressed air CA1 is switched back to the first accumulator valve 27 side by the switching valve 21, and the above operation is repeated. In this way, when the compressed air CA1 is continuously supplied by driving the drive pump P, the output air CA2 is sprayed alternately from the first nozzle N1 and the second nozzle N2, and both sensing surfaces 11a, 12a are cleaned well.

[0051] Next, the effects of the above embodiment will be described below. (1) When the output air CA2 is output from either the first nozzle N1 or the second nozzle N2, the pressure in the corresponding flow path is reduced, and the flow of compressed air CA1 is switched to the other of the first nozzle N1 and the second nozzle N2 by the action of the switching valve 21. Therefore, the compressed air CA1 supplied from the single drive pump P can be mechanically switched from the first nozzle N1 and the second nozzle N2 to be sprayed as the output air CA2. Therefore, the configuration can be simplified compared to a vehicle cleaning device equipped with a solenoid valve or the like. In more detail, in this embodiment, a solenoid valve, electric wires connected to the solenoid valve, a control unit for controlling the solenoid valve, and the like are not required.

[0052] (2) The first storage section 25 and the second storage section 26 stabilize the amount and pressure of the compressed air CA1 between the first check valve 23 and the switching valve 21 and between the second check valve 24 and the switching valve 21. This makes it possible to stabilize the switching of the flow of the compressed air CA1 by the switching valve 21, and also makes it possible to stably output the output air CA2 from the first nozzle N1 and the second nozzle N2.

[0053] (3) The first valve section 30a of the first accumulator valve 27 and the second accumulator valve 28 closes the introduction flow path 38 of the compressed air CA1 by the valve body 33a, and accumulates the compressed air CA1 supplied from the drive pump P to a pressure higher than the discharge pressure of the drive pump P. In addition to the first valve section 30a, which also functions as an auxiliary mechanism for the first accumulator valve 27 and the second accumulator valve 28, the second valve section 30b, etc. cause leakage CAx of the compressed air CA1 from the introduction flow path 38 side during the above-mentioned accumulation, and accumulates pressure on the leakage side (valve chamber 36, etc.). Next, the valve body 33a is opened based on both pressures P1, P2 accumulated on the introduction flow path 38 side and the leakage side (valve chamber 36, etc.), and the compressed air CA1 accumulated on the introduction flow path 38 side is output to the discharge flow path 39. Then, thereafter, the valve element 33a is returned to a closed state to allow pressure to be accumulated on the side of the introduction flow path 38, and high-pressure, pulsating output air CA2 is generated based on the opening and closing operations of the valve element 33a. In other words, with such a configuration and operation of the first accumulator valve 27, the second accumulator valve 28, etc., it is possible to generate high-pressure, pulsating output air CA2.

[0054] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. The configurations of the first accumulator valve 27 and the second accumulator valve 28 in the above embodiment are merely examples, and may be modified as appropriate as long as they are configured to open at a pressure higher than the discharge pressure of the drive pump P.

[0055] For example, in the above-mentioned first accumulator valve 27 and second accumulator valve 28, the second valve portion 30b is configured to have substantially the same valve structure as the first valve portion 30a, but the second valve portion 30b may have a valve structure different from that of the first valve portion 30a.

[0056] In addition, the first accumulator valve 27 and the second accumulator valve 28 are configured as one component having two valve portions, the first valve portion 30a and the second valve portion 30b, but may be configured as, for example, two valve devices having a single valve portion connected in series. In this case, a check valve may be used on the downstream side.

[0057] Furthermore, in the above-described first accumulator valve 27 and second accumulator valve 28, leakage CAx of the compressed air CA1 is generated between the valve body 33a and the opening 38a to accumulate in the valve chamber 36, but an embodiment may be adopted in which a flow path is separately provided to leak the leakage CAx into the valve chamber 36. For example, an extremely small hole or slit that communicates the introduction flow path 38 and the valve chamber 36, or an abutment surface of the opening 38a with which the valve body 33a abuts may be roughened.

[0058] The configuration of the switching valve 21 in the above embodiment is merely an example, and may be changed as appropriate as long as the configuration has the same function. In the above embodiment, the vehicle cleaning device 20 is described as including the first storage section 25 and the second storage section 26, but is not limited thereto, and may be configured, for example, without including the first storage section 25 and the second storage section 26. Note that, in cases where the connection hose is long, etc., it is considered that the connection hose performs the same function as the first storage section 25 and the second storage section 26.

[0059] In the above embodiment, the vehicle cleaning device 20 sprays compressed air as a fluid onto the first and second cleaning targets, but it may spray a gas-liquid mixture or liquid. When using a liquid, it is preferable to ensure that the liquid itself is also dispersed from the cleaning target.

[0060] In the above embodiment, the first distance measurement sensor 11 and the second distance measurement sensor 12 were respectively arranged at the center of the front end of the vehicle 10 and the center of the rear end of the vehicle 10, but this is not limited to this and may be arranged, for example, on the left and right sides of the vehicle 10.

[0061] In the above embodiment, the sensing surfaces 11a, 12a are the first and second cleaning targets, but this is not limiting. For example, a camera that captures images of the surroundings of the vehicle 10, a sensor other than these optical sensors, or a sensor other than a sensor, such as a headlight, a tail lamp, an electronic side mirror camera, or a camera for checking the surroundings of the vehicle, may be the first and second cleaning targets.

[0062] Although the above embodiment is embodied in the vehicle cleaning device 20, the present invention may be embodied in other flow path switching devices capable of switching and outputting a fluid from the first output portion and the second output portion. That is, in the above embodiment, the first output portion is the first nozzle N1, and the second output portion is the second nozzle N2, but this is not limited thereto, and for example, the first output portion and the second output portion may be other elements, and may be connected to other devices, etc. [Explanation of symbols]

[0063] Reference Signs List 11a...sensing surface (first cleaning target), 12a...sensing surface (second cleaning target), 20...vehicle cleaning device (flow path switching device), 21...switching valve, 22...branching section, 23...first check valve, 24...second check valve, 25...first storage section, 26...second storage section, 27...first accumulator valve, 28...second accumulator valve, 30a...first valve section (valve section, auxiliary mechanism), 30b...second valve section (auxiliary mechanism), 33...diaphragm (auxiliary mechanism), 33a...valve body, 36...valve chamber (auxiliary mechanism), 38...inlet flow path, 39...outlet flow path, 43...switching diaphragm (switching valve body), 44...first inlet, 45...first outlet, 46...first valve chamber, 47...second inlet, 48...second outlet, 49...second valve chamber, CA1...compressed air, CAx...leak, N1...first nozzle (first output part), N2...second nozzle (second output part), P...drive pump, P1...pressure, P2...pressure, R0...source flow path, R1...first flow path, R2...second flow path.

Claims

1. A flow path switching device (20) capable of switching between a first output section (N1) and a second output section (N2) to output a fluid (CA1) supplied from a drive pump (P), a switching valve (21) that switches the flow of the fluid to the other of the first output portion and the second output portion by reducing a pressure in a corresponding flow path due to an output of the fluid from either the first output portion or the second output portion; a branching portion (22) connected to the drive pump and branching a source flow path (R0) of the fluid supplied from the drive pump into a first flow path (R1) side and a second flow path (R2) side; a first check valve (23) connected in the first flow path between the branch portion and the switching valve to prevent the fluid from flowing back toward the branch portion; a second check valve (24) connected in the second flow path between the branching portion and the switching valve to prevent the fluid from flowing back toward the branching portion; a first accumulator valve (27) connected in the first flow path between the switching valve and the first output portion and opening at a pressure higher than a discharge pressure of the drive pump; a second accumulator valve (28) connected in the second flow path between the switching valve and the second output portion and opening at a pressure higher than a discharge pressure of the drive pump; A flow path switching device comprising:

2. a first reservoir (25) connected in the first flow path between the first check valve and the switching valve and capable of storing the fluid; a second reservoir (26) connected in the second flow path between the second check valve and the switching valve and capable of storing the fluid; The flow path switching device according to claim 1 .

3. The first accumulator valve and the second accumulator valve are a valve portion (30a) that closes an introduction flow path (38) for the fluid by a valve body (33a) and accumulates the fluid supplied from the drive pump to a pressure higher than the discharge pressure of the drive pump; an auxiliary mechanism (30a, 30b, 33, 36) configured to cause leakage (CAx) of the fluid from the introduction flow path side when accumulating pressure by the valve portion, accumulate pressure on the leakage side due to the leakage, open the valve body based on both pressures (P1, P2) accumulated on the introduction flow path side and the leakage side, output the fluid accumulated on the introduction flow path side based on the opening of the valve body to a discharge flow path (39), and return the valve body to a closed state so that pressure can be accumulated on the introduction flow path side based on the output of the fluid to the discharge flow path; The flow path switching device according to claim 1 or 2, comprising:

4. A flow path switching device (20) capable of switching and outputting a fluid (CA1) supplied from a drive pump (P) from a first output section (N1) and a second output section (N2), a switching valve (21) for switching the flow of the fluid to the other of the first output portion and the second output portion by reducing a pressure in a corresponding flow path due to an output of the fluid from either the first output portion or the second output portion, The switching valve is A first inlet (44); a first discharge port (45) communicating with the first inlet via a first valve chamber (46); A second inlet (47); a second discharge port (48) communicating with the second inlet via a second valve chamber (49); a switching valve body (43) interposed between the first valve chamber and the second valve chamber and configured to block the flow of the fluid to the first discharge port or the second discharge port in response to a pressure difference between the first valve chamber and the second valve chamber; A flow path switching device comprising:

5. The flow path switching device according to any one of claims 1 to 4 is a vehicle cleaning device, The first output portion is a first nozzle for spraying the fluid onto a first cleaning target (11a), The second output portion is a second nozzle for spraying the fluid onto a second cleaning target (12a).

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