JP2019138342A - Flow passage control valve - Google Patents

Abstract

To provide a flow passage control valve in which a valve body disposed in a housing operates smoothly to perform flow passage control stably.SOLUTION: A flow passage control valve 1 for controlling a flow passage for fluid comprises: a housing 2 that communicates with an introduction unit 10 for introducing fluid and discharge units 11 to 14 for discharging fluid; a valve body 3 that is movably provided along the inner surface of the housing 2 and opens or closes the discharge units 11 to 14; and a drive unit 5 configured to drive the valve body 3. The valve body 3 has a cylindrical peripheral wall part 35 having elasticity and extending in a circumferential direction, and openings L, M, N, P, and Q that are formed in the peripheral wall part and communicate with the discharge units 11 to 14.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flow path control valve that controls a flow path of a fluid.

  Conventionally, in flow control valves widely applied to residential equipment (for example, tankless toilets) and general equipment such as automobiles and industrial equipment, an input port for introducing fluid (introduction section) and an output port for discharging (discharge section) In some cases, a valve body that opens and closes these ports is provided inside a housing that communicates with the valve, and the valve body is driven by a drive unit to control the fluid flow path.

  Some of these flow path control valves have an output port that penetrates the peripheral wall of the casing, and this output is provided by a valve body that is movably disposed along the inner peripheral surface of the casing. There is one that controls fluid by opening and closing a port (see, for example, Patent Documents 1 and 2).

Japanese Patent Laying-Open No. 2006-31140 (page 4, FIG. 2) Japanese Patent Laying-Open No. 2015-218852 (page 6, FIG. 3)

  However, in Patent Documents 1 and 2, the valve body that moves in the housing is disposed in a C shape in an axial view in which a plate-like material is rounded and both ends in the circumferential direction are separated. Since the valve body receives the pressure of the fluid in the casing in the circumferential direction non-uniformly, the position of the valve body and the shape of the valve body are not stabilized, and the valve body locally interferes with the inner peripheral wall of the casing. There is a problem that damage may occur.

  The present invention has been made paying attention to such a problem, and the valve body arranged in the housing operates smoothly, and the flow path can be stably controlled. An object is to provide a control valve.

In order to solve the above problems, the flow path control valve of the present invention is:
A casing communicating with the introduction section for introducing fluid and the discharge section for discharging, a valve body that is movable along the inner surface of the casing and opens or closes the discharge section, and a drive that drives the valve body And a flow path control valve that controls the flow path of the fluid,
The valve body includes a cylindrical peripheral wall portion that has elasticity and extends in the circumferential direction, and an opening portion that is formed in the peripheral wall portion and communicates with the discharge portion.
According to this feature, the pressure of the fluid introduced into the housing through the introduction portion is evenly applied to the peripheral wall portion of the valve body in the circumferential direction. It is possible to stably control the fluid flow path by opening or closing the discharge portion through the opening portion of the peripheral wall portion.

The valve element is pivotally supported so as to be rotatable in the circumferential direction of the peripheral wall portion.
According to this feature, the peripheral wall portion can be stably rotated with a uniform load in the circumferential direction.

The valve body is formed in a bottomed cylindrical shape in which a bottom portion on the proximal end side of the peripheral wall portion is connected to the driving portion.
According to this feature, the driving force by the driving unit can be transmitted to the peripheral wall portion without being affected by the movement of the fluid in the peripheral wall portion formed in the bottomed cylindrical shape.

The valve body is characterized in that the open end side of the peripheral wall portion communicates with the introduction portion.
According to this feature, the fluid can always be introduced from the introduction portion regardless of the position of the valve body.

A plurality of the discharge sections are provided in the casing.
According to this feature, the flow path can be switched by opening and closing each of the plurality of discharge portions.

The opening is characterized in that a part of the plurality of discharge portions is opened so as to be always open through the opening.
According to this feature, since the valve body does not block all of the plurality of discharge portions, it is possible to prevent the peripheral wall portion of the valve body from receiving a large amount of fluid pressure and excessively elastically deforming to excessively increase the rotational load.

The tankless toilet of the present invention
The flow path control valve is applied as a valve for switching the flow path of the washing water.
According to this feature, since the flow path of the toilet flush water can be switched by the flow path control valve applied to the tankless toilet that does not have a water storage tank, the piping structure for switching the flow path is simplified and the cost is low. Can be.

It is a figure which shows the flow-path control valve in the Example of this invention, (a) is a top view, (b) is a front view, (c) is a left view, (d) is a right view. It is AA sectional drawing of Fig.1 (a). It is a perspective view which shows the drum of the phase angle 0 degree by which all the output ports are open | released. It is a figure explaining the relationship between the drum of FIG. 3, and an output port, (a) is BB sectional drawing of FIG. 2, (b) is CC sectional drawing, (c) is DD sectional drawing. is there. It is a figure which shows the relationship between the drum of the phase angle 135 degree | times in which only a 1st output port is open | released, and an output port, (a) is BB sectional drawing of FIG. 2, (b) is CC sectional drawing, (C) is DD sectional drawing. It is a figure which shows the relationship between the drum of the phase angle of 90 degree | times which open | releases only a 2nd output port, and an output port, (a) is BB sectional drawing of FIG. 2, (b) is CC sectional drawing, (C) is DD sectional drawing. It is a figure which shows the relationship between the drum of phase angle 180 degree | times with which only a 3rd output port is open | released, and an output port, (a) is BB sectional drawing of FIG. 2, (b) is CC sectional drawing, (C) is DD sectional drawing. It is a figure which shows the relationship between the drum of the phase angle 30 degree | times which open | releases a 1st output port and a 2nd output port, and an output port, (a) is BB sectional drawing of FIG. 2, (b) is C-. C sectional drawing and (c) are DD sectional drawings.

  EMBODIMENT OF THE INVENTION The form for implementing the flow-path control valve which concerns on this invention is demonstrated below based on an Example.

  The flow path control valve according to the embodiment will be described with reference to FIGS. First, reference numeral 1 in FIG. 1 is a flow path control valve of the present invention. The flow path control valve 1 according to the present embodiment is a valve that is applied to a so-called tankless toilet (not shown) that does not have a cleaning water storage tank, and is a cleaning water (fluid) that is subject to flow path control. Is a valve for branching to a plurality of systems according to the use timing and the flow rate and switching the flow path.

  As shown in FIG. 2, the flow path control valve 1 is hermetically sealed with a cylindrical body 2 having a hollow structure for containing a fluid therein, and an open end 26 on one end side in the axial direction of the body 2. , A lid member 4 provided with an input port 10 (introducing portion) penetrating therethrough for introducing fluid, a cylindrical drum 3 movably provided inside the body 2, and the other end side of the body 2 The rotary shaft 6 is attached to the through-hole portion 27 and rotatably supports the drum 3, and the motor 5 applies a rotational driving force to the rotary shaft 6.

  That is, the body 2 and the lid member 4 of the flow path control valve 1 constitute a casing according to the present invention, the drum 3 constitutes a valve body according to the present invention, and the rotating shaft 6 and the motor 5 according to the present invention. The drive unit is configured.

  The body 2 is made of a relatively hard resin material, and has the peripheral wall portion 25 having the open end portion 26 on one end side and the through hole portion 27 on the other end side as described above, and the inner peripheral surface of the peripheral wall portion 25. 2a is formed in a circular shape in cross section. In addition, discharge necks 21 to 24 constituting output ports 11 to 14 (discharge portions) that penetrate in the radial direction and discharge the fluid in the body 2 are provided at predetermined locations on the peripheral wall portion 25 of the body 2. It protrudes in the radial direction. Details of the plurality of output ports 11 to 14 will be described later.

  The lid member 4 is made of a relatively hard resin material, and an annular insertion portion 4 a that communicates with the input port 10 and extends in the axial direction is fitted into the open end portion 26 of the body 2, and the radial direction The lid member 4 is attached to the body 2 by screwing a plurality of screws 41 penetrating through the flange 4b extending into the female screw hole 28 formed in the end surface of the body 2.

  Moreover, since the O-ring 42 provided in the recessed part formed over the outer peripheral surface of the insertion part 4a of the lid member 4 over the entire circumference is in close contact with the inner peripheral surface of the body 2, the lid member 4 and the body 2 Is sealed. In addition, an introduction neck portion 20 that constitutes the input port 10 is formed at the center in the radial direction of the lid member 4 so as to protrude outward.

  The drum 3 is made of a thin resin material that is relatively soft and elastic, and is formed in a cylindrical shape having a bottom portion 30. The drum 3 is more preferably about 0.7 mm thick so that it can be easily elastically deformed and injection-molded, and POM (polyacetal) or PP (polypropylene) is used as the material. And preferred.

  An end portion 36 opened in the axial direction of the peripheral wall portion 35 of the drum 3 is disposed so as to communicate with the input port 10 of the lid member 4, and the end portion 36 and the distal end of the insertion portion 4 a of the lid member 4. An annular thrust seal 44 is interposed between them. Assembling can be simplified by fitting the thrust seal 44 to the end 36 of the drum 3 in the axial direction. On the outer surface of the bottom portion 30 connected to the other end side of the peripheral wall portion 35 of the drum 3, a concave portion 31 is formed in the central portion so as to be recessed in the axial direction. A fitting recess 33 that is further recessed in the axial direction is formed in the portion. The input port 10 is not necessarily limited to be disposed so as to communicate with the axial direction of the drum 3, and may be disposed so as to communicate with the radial direction of the drum 3 similarly to the output ports 11 to 14.

  Here, the state where each of the output ports 11 to 14 is closed by the peripheral wall portion 35 of the drum 3 will be described. The outer peripheral surface 3a of the peripheral wall portion 35 of the drum 3 is in a natural state not elastically deformed with the inner peripheral surface 2a of the body 2. It is formed in a slightly small diameter so that a gap is generated between them. In addition, the clearance between the outer peripheral surface 3a of the drum 3 and the inner peripheral surface 2a of the body 2 in a natural state where the drum 3 is not elastically deformed may be 10% or less of the outer diameter of the drum. 1% or less (for example, if the outer diameter of the drum 3 is φ20, the gap is 0.2 mm or less). When the primary pressure of the fluid introduced to the inside of the peripheral wall portion 35 through the input port 10 is applied to the drum 3, the peripheral wall portion 35 is elastically deformed in the diameter increasing direction, and the outer peripheral surface 3 a of the peripheral wall portion 35 is The output port is closed by approaching or abutting the periphery of the output port to be closed. The closed state of the output ports 11 to 14 does not mean only a completely sealed state, but means a state where a small amount of leakage (for example, about several hundred cc / min) can be allowed.

  As shown in FIG. 3, a plurality of through holes L that open in the flow path by penetrating in the radial direction and communicating with the output ports 11 to 14 of the body are provided in a predetermined plurality of locations on the peripheral wall portion 35 of the drum 3. M, N, P and Q (opening) are formed. Details of these through holes L, M, N, P and Q will be described later.

  As shown in FIG. 2, the rotary shaft 6 protrudes and penetrates through the through-hole portion 27 of the body 2, and its one end 6 a is relatively unrotatable with the fitting recess 33 formed in the bottom portion 30 of the drum 3. And the other end of the motor 5 is inserted into the rotational drive unit 5b.

  Further, since the O-rings 43, 43 provided in two concave portions formed on the outer peripheral surface of the rotating shaft 6 over the entire circumference are in close contact with the inner peripheral surface of the through-hole portion 27 of the body 2, The shaft 6 and the body 2 are sealed, and the rotating shaft 6 and the drum 3 are pivotally supported with respect to the body 2 in a state in which the rotation is possible in the circumferential direction and the movement is restricted in the radial direction.

  Further, around the rotating shaft 6, a spring 7 is externally provided in a compressed state between a bottom surface 32 of the recess 31 of the rotating shaft 6 and an interposed member 46 interposed in the inner bottom portion of the body 2. The drum 3 is positioned in the axial direction by always pressing and urging the drum 3 toward the lid member 4 in the axial direction by the elastic restoring force of the spring 7. The input port 10 of the lid member 4, the inner peripheral surface 2 a of the body 2, the outer peripheral surface 3 a of the drum 3, and the rotating shaft 6 are all arranged at concentric positions.

  The motor 5 has a case body 5a connected to the other end side of the body 2 by a screw 45 (FIG. 1), and a rotation driving unit 5b accommodated in the case body 5a. The rotation drive unit 5b is connected to a control signal cable T extending outside from a protruding neck portion 29 communicating with the case body 5a (see FIG. 1), and a control unit (not shown) is connected via the signal cable T. In the embodiment, the drum 3 connected to the rotating shaft 6 is driven to rotate at a desired phase angle based on a toilet cleaning operation panel). For example, the rotating shaft 6 is rotated by meshing a gear such as a bevel gear (not shown). It may be connected to the drive unit 5 b, or a magnetic body (not shown) may be provided on the rotating shaft 6 and a stepping motor may be applied as the motor 5.

  The flow path control valve 1 of the present embodiment is applied to a tankless toilet as described above, and supplies the cleaning water from the primary side (water source side) to the introduction neck 20 constituting the input port 10. The pipe R is connected. Moreover, according to the magnitude | size of the amount of water calculated | required by the secondary side (water discharge | release side) branched into multiple, such as toilet bowl wash water and a buttocks wash water, for example in the discharge neck parts 21-24 which comprise each output port 11-14 One end of a hose S having an appropriately selected diameter is connected.

  Note that an opening / closing valve (not shown) may be provided on the other end side of these hoses S. For example, the opening / closing valve may be opened when the toilet is on standby, and the opening / closing valve may be closed when the toilet is not used.

  Next, the plurality of output ports 11 to 14 provided in the body 2 will be described. In this embodiment, as shown in FIGS. 1A to 1D and FIG. 3, the body 2 passes through the peripheral wall portion 25 in the radial direction and has circular output ports 11 to 14 as viewed in the penetration direction. There are 4 places in total. The number of output ports, the opening direction, and the opening shape are not limited to the present embodiment.

  In the following description, the paper surface of FIG. 1B is defined as the up / down / left / right direction, the right side of FIG. First, the first output port 11 is provided at the upper center of the body 2 and substantially in the center in the axial direction, and the second output port 12 is provided at the right side of the body 2 and at the front end side in the axial direction. The output port 13 is provided on the left side portion of the body 2 and on the proximal end side in the axial direction, and the fourth output port 14 is provided on the upper portion of the body 2 and on the distal end side in the axial direction.

  That is, the first output port 11 and the fourth output port 14 are provided at the same position in the circumferential direction of the body 2 and at different positions in the axial direction, and the second output port 12 and the fourth output port 14 are They are provided at different positions in the circumferential direction of the body 2 and at substantially the same position in the axial direction.

  The first output port 11 and the second output port 12 have the same opening area. Further, the third output port 13 and the fourth output port 14 have the same opening area and are smaller than the opening areas of the first output port 11 and the second output port 12. The opening area of the input port 10 is larger than the total opening area of the first output port 11 to the fourth output port 14. By doing in this way, even if it exists in the state which opened all the output ports 11-14, the flow volume of the fluid supplied through the input port 10 and passing through each output port 11-14 can be ensured.

  Next, the plurality of through holes L, M, N, P and Q provided in the drum 3 will be described. In this embodiment, as shown in FIG. 3, the drum 3 penetrates the peripheral wall portion 35 of the drum 3 in the radial direction at an axial position corresponding to each of the output ports 11 to 14 provided in the body 2. A plurality of through holes L, M, N, P and Q are provided.

  In the following, referring to FIGS. 3 and 4, the through hole L is first positioned at the tip end side of the drum 3 in the axial position corresponding to the second output port 12 and the fourth output port 14 of the body 2. The penetrating port M is provided in an elliptical shape when viewed in the penetrating direction extending approximately 90 ° in the circumferential direction. The through hole N is provided in a circular shape when viewed in the through direction at a position in the same axial direction as the through hole M and at a different position in the circumferential direction, and the through hole P is the base of the drum 3. It is provided in a circular shape when viewed in the through direction at an axial position corresponding to the third output port 13 of the body 2 on the end side, and the through port Q is in the same axial position as the through port P, and A circular shape is provided at a position facing the through hole P in the circumferential direction.

  In addition, the opening dimensions in the axial direction of the through holes L, M, N, P, and Q are formed to be the same as or slightly larger than the opening diameters of the corresponding output ports 11 to 14. That is, the opening dimensions in the axial direction of the through holes L, M, and N are formed larger than the opening dimensions of the through holes P and Q. The base end side of the drum 3 is provided with a bottom portion 30 so as to cover the end surface, and therefore has a higher structural strength and is less likely to be elastically deformed in the diameter-expanding direction compared to the distal end side having the open end portion 36. . Therefore, it is preferable that the above-described through hole is provided on the distal end side rather than the proximal end side of the drum 3. Or when providing a through-hole in the base end side of the drum 3, like the through-holes P and Q provided in the base end side of the drum 3 of a present Example, the through-holes L and M provided in the front end side rather than these , N are preferably formed with a smaller opening diameter.

  Next, the open or closed state of each output port depending on the phase angle of the drum 3 will be described. When the drum 3 is positioned at the phase angle (0 degree) shown in FIGS. 3 and 4 by the above-described rotation driving unit 5b, one end in the circumferential direction of the through hole L opens the second output port 12 and The other end in the circumferential direction of the through hole L opens the fourth output port 14, the through port M opens the first output port 11, and the through port P opens the third output port 13. That is, at the phase angle 0 degree shown in FIGS. 3 and 4, all the output ports 11 to 14 are open.

  Next, the drum 3 is rotated approximately 135 degrees clockwise from the front end side of the drum 3 with respect to the state shown in FIGS. 3 and 4, and is positioned at the phase angle (135 degrees) shown in FIG. In this case, the through-hole N opens the first output port 11, and the remaining output ports 12, 13, and 14 are closed by the peripheral wall portion 35 of the drum 3. That is, only the first output port 11 is open at the phase angle of 135 degrees shown in FIG.

  Next, when the drum 3 is rotated approximately 90 degrees from the state shown in FIGS. 3 and 4 and positioned at the phase angle (90 degrees) shown in FIG. 6, one end in the circumferential direction of the through hole L is the second. The output port 12 is opened, and the remaining output ports 11, 13, and 14 are closed by the peripheral wall portion 35 of the drum 3. That is, at the phase angle of 90 degrees shown in FIG. 6, only the second output port 12 is open.

  Next, when the drum 3 rotates approximately 180 degrees from the state of FIGS. 3 and 4 and is positioned at the phase angle (180 degrees) shown in FIG. 7, the through hole Q opens the third output port 13. The remaining output ports 11, 12, and 14 are closed by the peripheral wall portion 35 of the drum 3. That is, at the phase angle of 180 degrees shown in FIG. 7, only the third output port 13 is open.

  Next, when the drum 3 rotates approximately 30 degrees from the state of FIGS. 3 and 4 and is positioned at the phase angle (30 degrees) shown in FIG. 8, the through hole L opens the second output port 12. At the same time, the through-hole M opens the first output port 11, and the remaining output ports 13 and 14 are closed by the peripheral wall portion 35 of the drum 3. That is, at the phase angle of 30 degrees shown in FIG. 8, the first output port 11 and the second output port 12 are open.

  As described above, since a plurality of output ports 11 to 14 are provided in the body 2, the flow paths can be switched by opening and closing each of these output ports 11 to 14.

  Further, even when the drum 3 is positioned at any phase angle other than those described with reference to FIGS. 4 to 8, at least one of the plurality of output ports 11 to 14 is always open. It is comprised so that it may become. In this way, since the drum 3 does not block all of the plurality of output ports 11 to 14, the peripheral wall portion 35 of the drum 3 is excessively elastically deformed due to a large fluid pressure and excessively rotates. Can be prevented.

  Further, the drum 3 is formed in a bottomed cylindrical shape in which the base 30 on the base end side of the peripheral wall 35 is connected to the rotary shaft 6, so that the motor is not affected by the movement of fluid in the peripheral wall 35. 5 can be transmitted to the peripheral wall 35.

  Furthermore, since the open end side of the peripheral wall portion 35 of the drum 3 communicates with the input port 10, fluid can always be introduced from the input port 10 regardless of the position of the phase angle of the drum 3.

  In the drum 3, a fitting recess 33 in the bottom 30, which is an end in the axial direction, is pivotally supported by the rotating shaft 6 that penetrates the through hole 27 of the body 2. Therefore, the drum 3 is restricted from moving in the radial direction with respect to the inner peripheral surface 2a of the body 2, and only the elastic expansion of the drum 3 surrounds the gap between the outer peripheral surface 3a of the drum 3 and the inner peripheral surface 2a of the body 2. Since it can be made uniformly small in the direction, it is possible to avoid the possibility that the drum 3 and the body 2 collide locally and are damaged.

  As described above, according to the flow path control valve 1 according to the present invention, the pressure of the fluid introduced into the body 2 through the input port 10 is equally applied to the peripheral wall portion 35 of the drum 3 in the circumferential direction. Therefore, the drum 3 moves smoothly along the inner peripheral surface 2a of the body 2 in a state where the drum 3 is elastically deformed without locally interfering with the body 2, and the through holes L, M, N, P, and Q of the peripheral wall portion 35 are moved. By opening or closing the output ports 11 to 14 via the flow path, the flow path of the fluid can be controlled stably.

  Moreover, since the flow control valve 1 can switch the wash water from the primary side (water source side) to the branch flow paths of a plurality of tankless toilets, it is necessary to install an on-off valve for each system as in the past. As a result, it is possible to achieve a significant reduction in the number of parts and a reduction in processing and assembly man-hours.

  Moreover, since the flow path control valve 1 is applied to a tankless toilet that does not have a water storage tank as described above, the flow path of toilet flush water can be switched, thereby simplifying the piping structure for switching the flow path. At the same time, the cost can be reduced.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the flow path control valve 1 according to the present invention is applied to a tankless toilet in this embodiment, but is not limited thereto, and may be applied to a vehicle, for example. May be applied to the switching of the flow path of the cooling water supplied to the radiator for cooling the engine and the heater core for cooling the car heater. Further, the fluid that the flow path control valve 1 according to the present invention controls the flow path is not limited to clean water, and may be, for example, a liquid to which various chemicals are added.

  Further, for example, in the above-described embodiment, the drum 3 is rotatably supported in the circumferential direction of the peripheral wall portion 35. However, the drum 3 is not limited thereto, and for example, the drum 3 is movable in the axial direction of the peripheral wall portion 35 The flow path may be controlled by moving in the axial direction.

  Further, for example, in the above-described embodiment, the body 2 is provided with the circular output ports 11 to 14 when viewed in the penetration direction. However, the present invention is not limited to this, and for example, an elliptical or elliptical shape that forms a long diameter portion in the circumferential direction. An elongated hole may be provided and the opening area of the elongated hole may be gradually narrowed by rotating the drum. According to the flow path control valve having such a configuration, not only the opening / closing control of the flow path, Flow rate control according to the opening area can be performed.

1 Channel control valve 2 Body (housing)
2a Inner peripheral surface 3 Drum (valve)
3a Outer peripheral surface 4 Lid member (housing)
5 Motor (drive unit)
6 Rotating shaft 7 Spring 10 Input port (Introduction part)
11 First output port (discharge section)
12 Second output port (discharge section)
13 3rd output port (discharge part)
14 4th output port (discharge section)
20 Introducing neck parts 21 to 24 Discharging neck part 25 Peripheral wall part 26 Open end part 27 Through hole part 30 Bottom part 35 Peripheral wall parts L, M, N, P, Q Through-hole (opening part)

Claims (7)

A casing communicating with the introduction section for introducing fluid and the discharge section for discharging, a valve body that is movable along the inner surface of the casing and opens or closes the discharge section, and a drive that drives the valve body And a flow path control valve that controls the flow path of the fluid,
The valve body includes a cylindrical peripheral wall portion that has elasticity and extends in the circumferential direction, and an opening portion that is formed in the peripheral wall portion and communicates with the discharge portion. .   The flow path control valve according to claim 1, wherein the valve body is pivotally supported so as to be rotatable in a circumferential direction of the peripheral wall portion.   3. The flow path control valve according to claim 1, wherein the valve body is formed in a bottomed cylindrical shape in which a bottom portion on a proximal end side of the peripheral wall portion is connected to the driving portion.   4. The flow path control valve according to claim 3, wherein the valve body has a distal end side of the peripheral wall portion open to communicate with the introduction portion.   The flow path control valve according to claim 1, wherein a plurality of the discharge portions are provided in the housing.   The flow path control valve according to claim 5, wherein the opening portion is opened such that a part of the plurality of discharge portions is always opened through the opening portion.   A tankless toilet, wherein the flow path control valve according to claim 5 or 6 is applied as a valve for switching the flow path of the washing water.

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