JP2020001002A - Liquid jet device and valve - Google Patents

Abstract

To provide a liquid jet device in which air-bleeding work can be performed easily, and a valve.SOLUTION: A liquid jet device 1 according to an embodiment comprises: a nozzle 11, which can be opened and closed, through which liquid is jetted when opened; a pump 12 that pressure-feeds the liquid to the nozzle 11 from a liquid source (a tank 15); and a strainer 16 that filters liquid flowing from the liquid source toward the pump 12, which further comprises: a branched path 17, branched from a space between the nozzle 11 and the pump 12, through which liquid flows at least when the nozzle 11 is closed; a first return path 31 through which liquid to be returned to the liquid source flows; a second return path 32 through which liquid to be returned to the strainer 16 flows; and a switch valve 2, interposed among a downstream side of the branched path 17 and respective upstream sides of the first return path 31 and the second return path 32, which switches return of liquid flowing out through the branched path 17 to any one of the strainer 16 and the liquid source.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid ejecting apparatus for ejecting liquid and a valve.

Conventionally, a liquid ejecting apparatus including a pump and a nozzle has been used. The pump pumps liquid from the liquid source to the nozzle. The nozzle can be opened and closed. The liquid discharged by the pump is ejected from the opened nozzle. Such a liquid ejecting apparatus is configured as, for example, a washing machine for washing a floor, a vehicle body, and the like with the ejected liquid.
Foreign matter may be mixed in the liquid of the liquid source. Patent Literature 1 describes a liquid ejecting apparatus further including a strainer. The strainer has a filter and is interposed between the liquid source and the pump. Foreign matter mixed in the liquid of the liquid source is captured and removed by the filter of the strainer.

  The liquid ejecting apparatus described in Patent Literature 1 further includes a return path for returning part or all of the liquid discharged by the pump to the strainer as remaining water. If the nozzle is closed, any liquid discharged by the pump will be returned to the strainer and backwash the filter. As a result, foreign matter is removed from the filter. The liquid that has washed the filter back is sucked into the pump again.

JP 2006-341161 A

Before the liquid ejecting apparatus is used, air may be trapped inside the liquid ejecting apparatus, so that air is vented.
In the case of the liquid ejecting apparatus described in Patent Literature 1, if the nozzle is closed even when the pump is turned on, the air inside the liquid ejecting apparatus is sent to the pump through the strainer. Therefore, it is necessary to open the nozzle to release air. When the nozzle is opened, the air inside the liquid ejecting device is discharged from the nozzle to the outside. On the other hand, if the nozzle is open even after the air release ends, the liquid is ejected from the nozzle. Therefore, it is necessary to close the nozzle. That is, in the liquid ejecting apparatus described in Patent Literature 1, the air bleeding operation is complicated.

  The present invention has been made in view of such circumstances, and a main object of the present invention is to provide a liquid ejecting apparatus and a valve in which an air bleeding operation is easy.

  The liquid ejecting apparatus according to the present embodiment can be opened and closed, a nozzle from which liquid is ejected when opened, a pump for pumping liquid from a liquid source to the nozzle, and a pump from the liquid source to the pump. And a strainer for filtering the liquid flowing therethrough, wherein the liquid jetting device branches off from between the nozzle and the pump, and the liquid flows through at least when the nozzle is closed, and returns to the liquid source. A first return path through which the liquid to be returned flows, a second return path through which the liquid returned to the strainer flows, and a downstream side of the branch path, the first return path, and the second return path. A switching valve interposed between the upstream side and a return valve for switching return of the liquid flowing out of the branch path to one of the strainer and the liquid source.

  In the liquid ejecting apparatus according to the present embodiment, the switching valve is connected to the branch passage, and has an inlet through which the liquid flows, two outlets through which the liquid flowing from the inlet flows out, A valve body for exclusively opening and closing the two outlets, and a biasing member for biasing the valve body in a direction in which one of the two outlets is opened and the other of the two outlets is closed The first return path is connected to the one, the second return path is connected to the other, the pressure of the liquid flowing from the inflow port of the urging member By canceling the bias, the one is closed and the other is opened.

  The valve according to the present embodiment has an inflow port into which the liquid flows, two outflow ports from which the liquid flowing out from the inflow port flows out, and a valve body for exclusively opening and closing the two outflow ports, An urging member for urging the valve body in a direction in which one of the two outlets is open and the other of the two outlets is closed, and the pressure of the liquid flowing from the inflow port is By canceling the urging of the urging member, the one is closed and the other is opened.

  The valve according to the present embodiment extends in one direction, the liquid flowing from the inflow port flows in the middle in the longitudinal direction, one end communicates with the one, and the other end communicates with the other. A flow path, one valve seat provided at the one end of the flow path, and another valve seat provided at the other end of the flow path; Has one valve part to be attached to and detached from the one valve seat, and another valve part to be attached to and detached from the other valve seat, and can reciprocate in the one direction inside the communication passage. The biasing member biases the valve body in a direction in which the one valve portion is separated from the one valve seat and the other valve portion is seated on the other valve seat. It is characterized by.

  The valve according to the present embodiment, wherein the valve body has a shaft portion extending in the one direction and a large-diameter portion provided at one end of the shaft portion and having a larger diameter than the shaft portion. The large-diameter portion is disposed between a portion communicating with the inflow port of the communication channel and the one valve seat, and the one valve portion is a reverse of the shaft portion of the large-diameter portion. And the other valve portion is provided at the other end of the shaft portion and is directed to the other valve seat. .

In the present embodiment, the pump pumps the liquid from the liquid source to the nozzle. The liquid going from the liquid source to the pump is filtered by the strainer.
When the nozzle is open, the liquid discharged by the pump is ejected from the nozzle.

When the switching valve is switched to the return side to the liquid source when the nozzle is closed, the liquid discharged by the pump flows through the branch path and the first return path and is returned to the liquid source. By returning the liquid from the pump to the liquid source when the nozzle is closed, the liquid inside the liquid ejecting apparatus is prevented from being overheated.
When the switching valve is switched to the return side to the strainer when the nozzle is closed, the liquid discharged by the pump is returned to the strainer through the branch path and the second return path. The liquid returned to the strainer is sucked into the pump again. By circulating the liquid between the pump and the strainer when the nozzle is closed, overheating of the liquid inside the liquid ejecting apparatus is suppressed.

  At the time of air release, if the nozzle is closed and the switching valve is switched to the return side to the liquid source, the air inside the liquid ejecting apparatus is discharged to the liquid source. That is, air can be removed while the nozzle is closed. Therefore, there is no need to open the nozzle for air bleeding, nor to close the nozzle at the end of air bleeding. As a result, the air bleeding operation is simple.

In the present embodiment, the outlet of the switching valve to which the first return path is connected is opened by the urging of the urging member, and the outlet of the switching valve to which the second return path is connected is opened. Will be closed. That is, normally, the switching valve is switched to the return side to the liquid source.
At the time of bleeding, the switching valve remains switched to the return side to the liquid source because no liquid flows from the inlet of the switching valve. Therefore, the air inside the liquid ejecting apparatus is discharged to the liquid source. That is, since it is not necessary to manually switch the switching valve at the time of air release, the air release operation is simple.

When the pressure of the liquid flowing from the inflow port of the switching valve is high after the end of the air release, the urging of the urging member is canceled, so the outflow port to which the first return path of the switching valve is connected is closed, The outlet to which the second return path of the switching valve is connected is opened. That is, the switching valve switches to the return side to the strainer. Therefore, the liquid discharged by the pump flows through the branch path and the second return path and is returned to the strainer.
When the pressure of the liquid flowing from the inflow port of the switching valve is low, the liquid discharged by the pump flows through the branch path and the first return path and is returned to the liquid source.

In the present embodiment, when the liquid is not flowing from the inflow port or when the pressure of the inflowing liquid is low, one of the two outflow ports is opened by the urging of the urging member, and The other of the two outlets is closed.
When the pressure of the liquid flowing from the inlet is high, the urging of the urging member is canceled, so that one of the two outlets is closed and the other of the two outlets is opened.
In other words, the switching valve can selectively switch the opened one of the two outlets according to the presence or absence of the liquid flowing from the inlet or the level of the pressure of the liquid flowing from the inlet. it can. Therefore, an actuator for driving the valve element is unnecessary. The opening and closing of the two outlets can be switched naturally. Therefore, there is no need to artificially switch the opening and closing of the two outlets.

  In the present embodiment, the liquid that has flowed in from the inflow port flows halfway in the longitudinal direction of the flow channel. The valve body reciprocates along the longitudinal direction of the communication channel by the urging of the urging member and the cancellation of the urging.

When the valve element moves to one side in the longitudinal direction of the communication passage due to the urging of the urging member, one valve part is separated from one valve seat, and another valve part is seated on another valve seat. I do. Then, the outlet on one valve seat side is opened, and the outlet on the other valve seat side is closed.
When the urging of the urging member is canceled and the valve body moves to the other side in the longitudinal direction of the communication channel, one valve portion is seated on one valve seat, and the other valve portion is connected to the other valve. Leave your seat. Then, the outlet on one valve seat side is closed, and the outlet on the other valve seat side is opened.

  In the present embodiment, a large diameter portion is provided at one end of the shaft portion, and one valve portion is provided at the large diameter portion. Another valve portion is provided at the other end of the shaft portion.

  Normally, the outlet on one valve seat side is opened and the outlet on the other valve seat side is closed by the urging force of the urging member. The liquid that has flowed into the communication channel from the inflow port passes through the gap between the large-diameter portion and the wall surface of the communication channel and heads for the outflow port on one valve seat side. The gap between the large diameter portion and the wall of the communication channel is smaller than the gap between the shaft portion and the wall of the communication channel. Therefore, the pressure of the liquid flowing from the flow passage toward the outlet on the one valve seat side is high on the upstream side of the large diameter portion and low on the downstream side of the large diameter portion. Therefore, a force acts on the large-diameter portion (and thus the valve body) in such a manner that one valve portion is seated on one valve seat and the other valve portion is separated from the other valve seat. When this force exceeds the urging force of the urging member, the outlet on one valve seat side is closed and the outlet on the other valve seat side is opened.

According to the liquid ejecting apparatus of the present embodiment, the air bleeding operation is simple.
The valve of the present embodiment is particularly suitable as a switching valve included in the liquid ejecting apparatus of the present embodiment.

FIG. 1 is a schematic diagram illustrating a configuration of a liquid ejecting apparatus according to an embodiment. FIG. 4 is a schematic diagram illustrating the liquid ejecting apparatus when the nozzle is closed. It is sectional drawing of a switching valve. It is operation | movement explanatory drawing of a switching valve. FIG. 3 is a schematic diagram showing the liquid ejecting apparatus at the time of starting.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.

FIG. 1 is a schematic diagram illustrating a configuration of a liquid ejecting apparatus according to an embodiment.
In the figure, reference numeral 1 denotes a liquid ejecting apparatus, and the liquid ejecting apparatus 1 includes a nozzle 11 and a pump 12.
The nozzle 11 has a trigger 111. When the trigger 111 is not operated, the nozzle 11 is closed. While the trigger 111 is operated, the nozzle 11 is open. The larger the operation amount of the trigger 111 is, the larger the opening amount of the nozzle 11 is.

Pump 12 pumps the liquid. The discharge side of the pump 12 is connected to the nozzle 11 via the liquid discharge path 13. The suction side of the pump 12 is connected to a tank 15 (liquid source) via a liquid suction path 14.
Liquid is stored in the tank 15. The pump 12 sucks up the liquid in the tank 15 through the liquid suction path 14 and discharges the sucked liquid into the liquid discharge path 13.

  FIG. 1 shows the liquid ejecting apparatus 1 when the nozzle 11 is open. When the nozzle 11 is open, the liquid discharged into the discharge passage 13 is ejected from the nozzle 11 through the discharge passage 13. The liquid ejecting apparatus 1 of the present embodiment is configured as a washing machine for washing a floor, a vehicle body, and the like with the ejected liquid.

  Since the liquid in the tank 15 may contain foreign matter such as dust or gravel, a strainer 16 is provided in the middle of the liquid suction path 14. The strainer 16 has a built-in filter. The liquid going from the tank 15 to the pump 12 is filtered by the filter of the strainer 16. Foreign matter mixed in the liquid in the tank 15 is captured and removed by the filter of the strainer 16.

A branch path 17 branches from the middle of the liquid discharge path 13. An on-off valve 18 is provided at a branch point between the discharge passage 13 and the branch passage 17.
The on-off valve 18 opens / closes the branch passage 17 according to the magnitude of the pressure inside the liquid discharge passage 13. As the opening amount of the nozzle 11 is smaller, the pressure inside the liquid discharge passage 13 is larger, so that the opening amount of the on-off valve 18 is larger. When the nozzle 11 is closed, the opening amount of the on-off valve 18 is maximum. On the other hand, when the nozzle 11 is completely opened, the on-off valve 18 is closed. The on-off valve 18 is, for example, a known regulating valve or an unloader valve.

FIG. 2 is a schematic diagram showing the liquid ejecting apparatus 1 when the nozzle 11 is closed.
When the nozzle 11 is closed, the on-off valve 18 is open. Therefore, all the liquid discharged into the discharge passage 13 flows into the branch passage 17. At this time, the pressure of the liquid flowing into the branch passage 17 is high.

  When the nozzle 11 is incompletely opened, the on-off valve 18 is opened to a smaller extent than when the nozzle 11 is closed. Therefore, a part of the liquid discharged into the liquid discharge path 13 flows into the branch path 17 (see an arrow indicated by a two-dot chain line in FIG. 1). When the nozzle 11 is incompletely opened, the pressure of the liquid flowing into the branch 17 is lower than when the nozzle 11 is closed. The remainder of the liquid discharged into the liquid discharge passage 13 is jetted from the nozzle 11 (see the solid arrow in FIG. 1).

When the nozzle 11 is completely opened, the liquid does not flow into the branch passage 17 because the on-off valve 18 is closed. All the liquid discharged into the discharge path 13 is jetted from the nozzle 11.
As described above, the liquid flows through the branch passage 17 at least when the nozzle 11 is closed.

The liquid ejecting apparatus 1 further includes a switching valve 2 (valve).
FIG. 3 is a sectional view of the switching valve 2.
The switching valve 2 has a communication channel 21.
The passage 21 has a circular cross section and extends in the left-right direction as viewed in FIG. The communication channel 21 is provided inside the switching valve 2.
The diameter of the right end of the passage 21 decreases toward the right. A valve seat 211 (one valve seat) is provided at the right end of the communication channel 21 by reducing the diameter of the communication channel 21.
The diameter of the left end of the passage 21 is reduced toward the left. A valve seat 212 (another valve seat) is provided at the left end of the communication channel 21 by reducing the diameter of the communication channel 21.

The switching valve 2 further includes an inflow port 220 and two outflow ports 221 and 222. The inflow port 220 and the outflow ports 221 and 222 each open toward the outside of the switching valve 2.
The inflow port 220 communicates with the center of the communication channel 21 in the left-right direction. The downstream side of the branch path 17 is connected to the inflow port 220.

The outlet 221 communicates with the right end of the communication channel 21. The upstream side of the first return path 31 is connected to the outlet 221. The downstream side of the first return path 31 is connected to the tank 15.
The outlet 222 communicates with the left end of the communication channel 21. The upstream side of the second return path 32 is connected to the outlet 222. The downstream side of the second return path 32 is connected to the strainer 16.

The switching valve 2 further includes a valve element 23.
The valve body 23 has a shaft portion 231. The shaft 231 has a long cylindrical shape.
At one end of the shaft portion 231, a short cylindrical large-diameter portion 232 is provided coaxially with the shaft portion 231. The end of the large-diameter portion 232 on the side remote from the shaft portion 231 is reduced in diameter as the distance from the shaft portion 231 increases. The valve portion 233 (one valve portion) is provided in the large-diameter portion 232 by reducing the diameter of the large-diameter portion 232.
The other end of the shaft 231 is reduced in diameter toward the end. The valve portion 234 (another valve portion) is provided on the shaft portion 231 by reducing the diameter of the shaft portion 231.

  The valve body 23 is accommodated coaxially in the communication channel 21 such that the shaft portion 231 extends in the left-right direction, the valve portion 233 faces the valve seat 211, and the valve portion 234 faces the valve seat 212. The valve body 23 is supported by a support member (not shown) so as to be able to reciprocate in the left-right direction. The large diameter portion 232 is disposed between a portion communicating with the inflow port 220 of the communication channel 21 and the valve seat 211. A gap is provided between the peripheral surface of the large diameter portion 232 and the wall surface of the passage 21.

FIG. 4 is an explanatory diagram of the operation of the switching valve 2.
As the valve body 23 moves rightward, the valve portion 233 is seated on the valve seat 211, and the valve portion 234 is separated from the valve seat 212. As a result, the outlet 221 is closed, and the outlet 222 is opened.
As shown in FIG. 3, the valve portion 233 is separated from the valve seat 211 by the movement of the valve body 23 to the left, and the valve portion 234 is seated on the valve seat 212. As a result, the outlet 221 is opened, and the outlet 222 is closed. Even if the valve element 23 moves to the left, the large-diameter portion 232 is disposed on the right side of a portion communicating with the inflow port 220 of the communication channel 21.
As described above, the outlets 221 and 222 are exclusively opened and closed by the valve element 23.

A biasing member 24 is attached to the valve body 23. The urging member 24 is, for example, a coil spring, and urges the valve body 23 to the left of the shaft portion 231, the valve portion 233, and the valve portion 234.
By the urging of the urging member 24, the valve portion 233 is normally separated from the valve seat 211, and the valve portion 234 is seated on the valve seat 212 (home position). That is, the urging member 24 urges the valve body 23 in a direction in which the outlet 221 is opened and the outlet 222 is closed.

  When the valve element 23 is at the home position, the liquid flowing from the inlet 220 into the center of the communication channel 21 passes through a gap between the large-diameter portion 232 and the wall surface of the communication channel 21 and flows out of the outlet 221. Head for. The gap between the shaft portion 231 and the wall surface of the communication channel 21 is wide, and the gap between the large diameter portion 232 and the wall surface of the communication channel 21 is small. The liquid is an incompressible fluid. Therefore, the pressure of the liquid flowing from the passage 21 toward the outlet 221 is high on the upstream side (left side) of the large diameter portion 232 and low on the downstream side (right side) of the large diameter portion 232. Therefore, a rightward force acts on the large diameter portion 232 (and thus the valve body 23). When the rightward force acting on the valve element 23 exceeds the urging force of the urging member 24, the valve element 23 moves rightward. Therefore, as shown in FIG. 4, the valve part 233 is seated on the valve seat 211, and the valve part 234 is separated from the valve seat 212. That is, the outlet 221 is closed, and the outlet 222 is opened.

When the outlet 222 is open, the liquid flowing out of the outlet 222 is returned to the strainer 16 through the second return path 32.
The liquid returned to the strainer 16 is jetted toward the filter of the strainer 16. The liquid ejection direction is opposite to the direction in which the liquid flowing from the tank 15 to the pump 12 passes through the filter. The liquid ejected toward the filter is sucked into the pump 12 again after removing foreign substances from the filter (backwashing the filter). Foreign matter removed from the filter falls to the lower part of the strainer 16.
Since the pressure of the liquid returned to the strainer 16 is high, high-pressure liquid can be injected toward the filter. Therefore, foreign matter is easily removed from the filter.

When the rightward force acting on the valve element 23 falls below the urging force of the urging member 24, the valve element 23 moves to the left. Therefore, as shown in FIG. 3, the valve part 233 is separated from the valve seat 211, and the valve part 234 is seated on the valve seat 212. That is, the outlet 221 is opened, and the outlet 222 is closed.
When the outlet 221 is open, the liquid flowing out of the outlet 221 is returned to the tank 15 through the first return path 31.

When the nozzle 11 is closed, the on-off valve 18 is open. Since the pressure of the liquid flowing into the switching valve 2 from the branch passage 17 is high, the switching valve 2 is switched to the return side to the strainer 16 (see FIG. 4). Therefore, the liquid circulates between the pump 12 and the strainer 16 (see FIG. 2). Therefore, overheating of the liquid inside the liquid ejecting apparatus 1 is suppressed.
When the nozzle 11 is incompletely opened, the on-off valve 18 is open. When the pressure of the liquid flowing from the branch passage 17 into the switching valve 2 is low, the switching valve 2 is switched to the side to return to the tank 15 (see FIG. 3). Therefore, the liquid is returned from the pump 12 to the tank 15 (see FIG. 1). Therefore, the liquid inside the liquid ejecting apparatus 1 is prevented from being overheated.

  When the nozzle 11 is completely open, the on-off valve 18 is closed, so that no liquid is returned. Note that the on-off valve 18 may be slightly opened even when the nozzle 11 is completely opened.

  By the way, before the liquid ejecting apparatus 1 is used, air may be trapped inside the liquid ejecting apparatus 1 (for example, inside the liquid discharge passage 13), so that the air is vented. At this time, since the pressure inside the liquid discharge passage 13 is low (equal to the atmospheric pressure), the on-off valve 18 is closed.

FIG. 5 is a schematic diagram showing the liquid ejecting apparatus 1 at the time of starting.
When the liquid ejecting apparatus 1 is started, the pump 12 is turned on.
Nozzle 11 remains closed. The air inside the discharge passage 13 is compressed by the liquid discharged from the pump 12. Therefore, the pressure inside the discharge passage 13 increases, and the on-off valve 18 is opened. Then, the air inside the discharge passage 13 flows into the switching valve 2 through the branch passage 17.

As shown in FIG. 3, the valve element 23 of the switching valve 2 is at the home position. Since the outlet 221 is open, the air flowing from the inlet 220 of the switching valve 2 into the central portion of the communication channel 21 passes through the gap between the large diameter portion 232 and the wall surface of the communication channel 21. , Toward the outlet 221. Since the air is a compressive fluid, the rightward force acting on the valve element 23 by the air flowing through the narrow gap between the large diameter portion 232 and the wall surface of the communication channel 21 is small. Therefore, the valve body 23 is kept at the home position.
The air flowing out of the outlet 221 is discharged to the tank 15 through the first return path 31 (see FIG. 5).

As the air is removed, the liquid discharged from the pump 12 into the discharge passage 13 fills the discharge passage 13 and flows into the switching valve 2 through the branch passage 17. Then, as shown in FIG. 4, the outlet 221 is closed, and the outlet 222 is opened. The liquid flowing out of the outlet 222 is discharged to the strainer 16 through the second return path 32 (see FIG. 2).
When the liquid fills the liquid discharge passage 13, the air release ends. When the nozzle 11 is opened after the end of the air release, the liquid is ejected from the nozzle 11 (see FIG. 1). The floor, the vehicle body and the like are washed with the liquid ejected from the nozzle 11.

  According to the liquid ejecting apparatus 1 as described above, air can be removed while the nozzle 11 is closed. Therefore, there is no need to open the nozzle 11 for air bleeding, nor to close the nozzle 11 at the end of air bleeding. In addition, there is no need to manually switch the switching valve 2 to the return side to the tank 15 when bleeding air. As a result, the air bleeding operation is simple.

  The switching valve 2 selects one of the outlets 221 and 222 to be opened according to the presence or absence of the liquid flowing from the inlet 220 or the level of the pressure of the liquid flowing from the inlet 220. be able to. Therefore, an actuator for driving the valve element 23 is unnecessary. The opening and closing of the outlets 221 and 222 are switched naturally. Therefore, there is no need to artificially switch the opening and closing of the outlets 221 and 222.

Note that the liquid ejecting apparatus 1 does not need to include the tank 15.
The liquid ejecting apparatus 1 is not limited to a washing machine, and may be configured as a liquid spraying machine that ejects a mist-like liquid. The mist-like liquid ejected from the nozzle 11 adheres to, for example, crops in the field.
The liquid ejecting apparatus 1 includes the switching valve 2 that allows the opening and closing of the outlets 221 and 222 to be naturally switched according to the presence or absence or pressure of the liquid, but is not limited thereto. The liquid ejecting apparatus 1 may include a switching valve that switches the opening and closing of the outlets 221 and 222 manually or by an actuator. In this case, the switching valve 2 may be switched to the return side to the tank 15 when the nozzle 11 is closed.

The valve element 23 is not limited to a configuration in which the outlets 221 and 222 are exclusively opened and closed by reciprocating linearly.
The switching valve 2 is not limited to the configuration provided in the liquid ejecting apparatus 1.

  The embodiment disclosed this time is an example in all respects and should be considered not to be restrictive. The scope of the present invention is not intended to be in the above sense, but is intended to include equivalents to the claims and all modifications within the claims.

DESCRIPTION OF SYMBOLS 1 Liquid ejecting apparatus 11 Nozzle 12 Pump 15 Tank (liquid source)
16 Strainer 17 Branch passage 2 Switching valve (valve)
211 valve seat (one valve seat)
212 valve seat (other valve seat)
220 Inlet 221 Outflow 222 Outflow 23 Valve 231 Shaft 232 Large Diameter 233 Valve (one valve)
234 Valve (other valve)
24 urging member 31 first return path 32 second return path

Claims (5)

A nozzle that is openable and closable and that, when opened, ejects liquid;
A pump for pumping liquid from a liquid source to the nozzle,
And a strainer for filtering the liquid flowing from the liquid source to the pump.
A branch that branches from between the nozzle and the pump and through which liquid flows when at least the nozzle is closed;
A first return path through which the liquid returned to the liquid source flows;
A second return path through which the liquid returned to the strainer flows;
Returning the liquid flowing out of the branch path to one of the strainer and the liquid source, which is interposed between the downstream side of the branch path and the upstream side of each of the first return path and the second return path. And a switching valve for switching between the two. The switching valve,
An inflow port to which the branch path is connected, and into which a liquid flows,
Two outlets from which the liquid flowing in from the inlet flows out,
A valve element for exclusively opening and closing the two outlets;
An urging member for urging the valve body in a direction in which one of the two outlets is opened and the other of the two outlets is closed,
The first return path is connected to the one,
The second return path is connected to the other,
2. The liquid ejecting apparatus according to claim 1, wherein the one side is closed and the other side is opened by the pressure of the liquid flowing from the inflow port canceling the urging of the urging member. 3. An inlet through which the liquid flows,
Two outlets from which the liquid flowing in from the inlet flows out,
A valve element for exclusively opening and closing the two outlets;
An urging member for urging the valve body in a direction in which one of the two outlets is opened and the other of the two outlets is closed,
A valve wherein the one is closed and the other is opened by the pressure of the liquid flowing from the inflow port canceling the urging of the urging member. A liquid passage that extends in one direction, the liquid that has flowed in from the inflow port flows in the middle in the longitudinal direction, one end of which communicates with the one, and the other end communicates with the other.
One valve seat provided at the one end of the communication channel;
And another valve seat provided at the other end of the communication channel,
The valve body has one valve portion that is detached from the one valve seat, and another valve portion that is detached from the other valve seat, and in the one direction inside the communication passage. Reciprocable,
The urging member may urge the valve body in a direction in which the one valve portion is separated from the one valve seat and the other valve portion is seated on the other valve seat. The valve according to claim 3, characterized in that: The valve body has a shaft portion extending in the one direction and a large-diameter portion provided at one end of the shaft portion and having a larger diameter than the shaft portion.
The large diameter portion is disposed between a portion communicating with the inflow port of the communication channel and the one valve seat,
The one valve portion is provided on the opposite side of the shaft portion of the large diameter portion, and is directed to the one valve seat,
The valve according to claim 4, wherein the other valve portion is provided at the other end of the shaft portion, and is directed to the other valve seat.

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