JPS6213452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle cylinder for a human body private parts cleaning device (hereinafter simply referred to as the cleaning device) in a toilet. In recent years, the above-mentioned cleaning devices have been recognized for their usefulness from the viewpoint of health and hygiene, and have been used in large numbers. The general configuration of the cleaning device is as follows:
As shown in the figure, water in a toilet water tank 61 is filtered by a filter 62, heated in a hot water tank 63 to make hot water, and this hot water is pumped by a pump 64.
The hot water is sent to a nozzle cylinder A fixed to a toilet bowl 67 via piping 65, 66, and the second piston 4, or the second cylinder 3 and the second piston 4 are made to protrude from the first cylinder 100 by the water pressure of the hot water. 2
Warm water is jetted out from a nozzle 48 formed at the tip of the piston to clean the private parts of the human body.

As this nozzle device A, nozzle cylinders shown in FIGS. 8 and 9 exist as prior art. This nozzle cylinder is a cylindrical first cylinder 100.
and the first cylinder chamber 1 of this first cylinder 100
The first piston 20 is slidably mounted in the 07.
0, and a second piston fixed integrally with this first piston 200 and also inserted into the first cylinder chamber 107.
The main components are a cylinder 3 and a second piston 4 slidably mounted in a second cylinder chamber 36 of the second cylinder 3.

The first piston 100 has a cylindrical cylinder portion 1
01 and a rear end portion 102 that is liquid-tightly fixed to this rear end with a cap nut 103. This rear end portion 10
Two ports 104 and 105 are formed in 2, and these ports 104 and 105 constitute a first hydraulic waterway and a second hydraulic waterway, respectively. port 10
4 is a first cylinder chamber 107 in which a central waterway 104a is formed along the central axis of the rear end portion 102.
It is open to On the other hand, the port 105 opens into the first cylinder chamber 107 as a ring-shaped groove 105a along the peripheral edge of the first cylinder chamber 107. A rubber pipe-shaped seal 106 is fixed to the open end of the central waterway 104a of the rear end portion 102. The first piston 200 has a center through hole 2
06, and has two cylindrical grooves formed on its outer peripheral surface, in which a rubber seal is held. This first piston 200 is connected to the first cylinder 1
It is mounted so as to be slidable in the axial direction within the first cylinder chamber 107 of No. 00.

The second cylinder 3 has a cylindrical shape, and its rear end is coaxially fixed to one end of the first piston 200.

The first piston 200 is urged toward the rear end (leftward in the figure) by a spring 202. A ring-shaped stopper member 51 is inserted into the distal end of the cylinder portion 101 of the first cylinder 100, and the stopper member 51 further has the cylinder portion 10 at its distal end.
A fixing member 52 screwed to the cylinder part 101 is firmly pressed and fixed to the tip of the cylinder part 101. The spring 202 is inserted between the stopper member 51 and the first piston 200 in a compressed state.

The second piston 4 consists of a cylindrical rear end portion 41 having a central hole 411 and a tubular tube portion 42 whose tip is sealed and has an axial hole 47 coaxially fixed to one side of the rear end portion 41. . On the outer peripheral surface of the rear end portion 41,
Two ring-shaped grooves are formed into which rubber seals are inserted. This second piston 4
It is slidably mounted within the second cylinder chamber 36 of the cylinder 3. A spring 4 is inserted between the ring-shaped back surface of the rear end 41 of the second piston 4 and a guide 45 inserted into the tip of the second cylinder 3 and a guide fixture 46 fixed to the tip of the second cylinder 3 by screw connection.
3 is inserted in a compressed state and urges the second piston 4 toward the rear end. Note that the lower side peripheral wall of the tip of the cylindrical portion 42 of the second piston 4 is cut off, and a step 421 is formed in the lower middle of the cylindrical portion 42 (see FIG. 9). The guide 45 has a through hole having a shape equivalent to the circular cross-sectional shape of the distal end portion of the cylindrical portion 42, and the cylindrical portion 42 slides along this through hole.
It has the role of preventing the cylindrical portion 42 from rotating. A check valve 44 is incorporated into the central opening 411 of the rear end portion 41 of the second piston 4 . This check valve 44 is always urged toward the rear end by a spring 411.

The prior art nozzle cylinder has the above configuration.

FIG. 8 shows one state when pressure water is introduced into the port 104 of this nozzle cylinder. Note that pressure water is not introduced into the other ports 105.
When pressurized water is introduced through port 104, it flows through the central hole of seal 106, so that
The seal 106 increases in diameter due to the water pressure, and the seal 106 increases in diameter by the water pressure, and the seal 106 closes the central waterway 10 at the tip 102 of the first cylinder 100.
4a and the center through hole 206 of the first piston 200
A seal 106 is pressed against the inner wall surface, and the tip 102 of the first cylinder 100 and the first piston 200
Seal between. and the first piston 200
Pressure water flows into the second cylinder chamber 36 of the second cylinder 3 through the central through hole 206 of the second cylinder 3 . This water pressure resists the biasing force of the spring 43 and drives the second piston 4 inserted into the second cylinder chamber 36 in the distal direction (rightward in the figure). The spring 411 of the check valve 44 is made strong enough to prevent the valve from opening under the water pressure at this time.
is the through hole 411 of the tip portion 41 of the second piston 4
is closed. FIG. 8 shows a cross section of the nozzle cylinder in this state.

When the pressure water is further introduced from the port 104, the stepped portion 421 of the second piston 4 collides with the guide 45, and the movement of the second piston 4 is stopped. If pressure water further flows into port 104 in this state,
The water pressure in the second piston chamber 36 increases, and the increased water pressure causes the check valve 44 to open and pressure water to flow into the shaft hole 47 of the cylinder 42 . The pressure water 47 that has flowed in is then jetted out from the nozzle 48. Incidentally, the jetted water in this case is used as washing water for anal washing.

FIG. 9 shows a state in which pressure water is introduced into ports 104 and 105 at the same time. By introducing pressure water into the port 105, pressure water is introduced between the rear end of the first cylinder chamber 107 and the rear end of the first piston 200, and the first piston 200
Driven in the distal direction by water pressure. In this case, the seal 106 is separated from the inner peripheral surface of the center through hole 206 of the first piston 200. Furthermore, the first piston 2
00 through the center through hole 206, and the second cylinder 3
Pressure water flows into the second cylinder chamber 36, and the second piston 4 is driven in the distal direction by the water pressure. FIG. 9 shows a cross section of the nozzle cylinder in this state.

Furthermore, when pressure water is introduced into the ports 104 and 105, the first piston 200 and the second piston 4 are urged in the distal direction, so that the nozzle 4
8 protrudes in the distal direction by a length that is the sum of the amount of movement of the first piston and the amount of movement of the second piston.
When the movement of the first piston 200 and the second piston 4 is completed, the water pressure increases and overcomes the biasing force of the check valve 44, and the pressure water flows into the shaft hole 47 of the cylinder body 42, and the pressure is released from the nozzle 48 to the outside. Water gushes out. In this case, the jetted water becomes water for washing the woman's private parts (bidet).

Note that the amount of water introduced when cleaning the anus is relatively large, and the amount of water introduced when cleaning the bidet is due to the water pump 6.
4, and the water pump 64 is adjusted so that the most suitable amount of water is spouted.

The above-described prior art nozzle cylinder uses a rubber seal as the seal 106, and sliding friction occurs between the tip of the seal 106 and the inner peripheral surface of the center through hole 206 of the first piston 200. Further, when pressure water is introduced into the port 104, the seal 106 is significantly deformed. These could lead to deterioration of the seal 106 of the prior art nozzle cylinder.

The nozzle cylinder of the present invention provides a nozzle cylinder free from such problems.

That is, the nozzle cylinder of the human body private parts cleaning device of the present invention includes a first cylinder whose rear end is sealed, and a central through hole that is slidably attached to the first cylinder chamber of the first cylinder and is biased toward the rear end. a first piston having a first piston, a second cylinder integrally formed with the first piston, a nozzle that is slidably attached to a second cylinder chamber of the second cylinder and that spouts water at a tip thereof; The second piston has a shaft hole communicating with the nozzle and is biased toward the rear end of the piston. protrusion of the second piston, and protrusion of the first piston and the second piston by introducing pressure water into the first cylinder chamber on the rear end side of the first piston and the second cylinder chamber on the rear end side of the second piston; In the nozzle cylinder of the human body private parts cleaning device, the second piston protrudes in two stages and water is selectively ejected from the nozzle at the tip of the second piston to one of the two private parts of the human body. The rear end of the first cylinder has a port for a first water pressure waterway that opens at the rear end of the first cylinder chamber,
The rear end of the first piston is connected to a first water channel connecting a first cylinder chamber on the rear end side of the first piston and a rear end of the second cylinder chamber, and a first cylinder provided in the first water channel. It has a check valve that only allows water to flow from the chamber into the second cylinder chamber, and the rear end of the second cylinder has a port for a second water channel that opens to the rear end of the second cylinder chamber. It is something to do.

In the nozzle cylinder of the present invention, FIG.
A feature is that a check valve is used in the center through hole of the first piston in place of the valve 106 in the prior art nozzle cylinder shown in FIG. And the first
By introducing pressure water into the first cylinder chamber on the rear end side of the piston, the first piston is driven, and a check valve provided in the passage of the first piston is opened to allow the pressure water to flow into the second cylinder chamber. Lead to the second
The second piston is driven in the distal direction by the water pressure flowing into the cylinder chamber. When only the second cylinder is driven, pressurized water is introduced into the second cylinder chamber at the rear end of the second cylinder, and the check valve prevents pressure water from flowing into the first cylinder chamber. Two pistons are driven in the distal direction by water pressure, and only the second piston is driven.

Other configurations of the nozzle cylinder of the present invention include the structure and components of the prior art nozzle cylinder described above;
They are almost identical. Various methods can be considered for introducing pressure water into the second cylinder chamber, including the rear end of the second cylinder or the stopping position of the first piston when the first piston is biased toward the rear end. A through hole is provided in the side wall of the first cylinder corresponding to the rear end of the second cylinder or the first cylinder.
The piston can be provided with a second water channel that matches the through hole, and a passage can be provided for introducing pressure water into the second cylinder chamber through the through hole and the second water channel.

Further, a through hole is provided in the side wall surface of the first cylinder at the tip further from the position of the first piston at the position where the first piston is driven to the tip, and the first cylinder chamber in the tip direction from the first piston is opened through the through hole. A second water channel is provided at the rear end of the first piston or second cylinder, and a second water channel is introduced from this water channel into the rear end of the first piston or second cylinder.
Pressure water can be introduced into the cylinder chamber. In this case, even if the first cylinder is biased in the distal direction, the pressure water should be switched, the water in the first cylinder chamber flowing, and the pressure water introduced into the second cylinder chamber. This makes it possible to move the first piston toward the rear end and drive the second piston toward the front end to return the nozzle from the bidet cleaning position to the anus cleaning nozzle position.
In this case, if a check valve is provided in the second waterway that allows water to flow only into the second cylinder chamber, when pressure water is introduced into the first cylinder chamber, water will escape to the first cylinder on the tip side of the first piston. There are no advantages. Examples will be explained below.

Embodiment 1 A first embodiment of the nozzle cylinder of the human body private part cleaning device of the present invention is shown in FIGS. 1 to 3.

The nozzle cylinder of the first embodiment has a cylindrical first cylinder 1, a first piston 2, a second cylinder 3, and a second piston 4 as main components. The second cylinder 3 and second piston 4 of this nozzle cylinder are the same as the second cylinder 3 and second piston 4 shown in FIGS. 8 and 9, which were previously described as prior art.

The first cylinder 1 includes a cylindrical cylinder part 11 and a rear end part 12 liquid-tightly fixed to the rear end of the cylinder part 11 by a screw connection. This rear end portion 12 has a center hole 12
1, into which a port 13 is inserted and fixed. This port 13 constitutes a first hydraulic waterway. Further, a shallow circular recess is formed on the outlet side of the center hole 121 of the rear end portion 12, and this recess constitutes a part of the first cylinder chamber 17. A port 14 is inserted into the outer wall near the rear end of the cylinder portion 11, and a water channel is formed from the port 14 into the first cylinder chamber 17. Note that the port 14 constitutes a second hydraulic waterway.

The first piston 2 has a cylindrical shape with a central through hole 26, and has a ring-shaped groove formed on its outer peripheral surface, in which a rubber seal 23 is held. A second cylinder 3 is coaxially connected to the first piston 2. Center through hole 26 of first piston 2
A check valve 27 is incorporated in the . This check valve 27 has a semicircular valve portion 271 and a weak spring 27.
The circular outer circumferential surface of the semicircular valve portion 271 contacts the inner circumferential surface of the center through hole 26 and is pressed against the inner circumferential surface of the center through hole 26 by a spring 272. This check valve 27 allows water to flow into the second cylinder chamber 36 of the second cylinder 3 from the rear end side of the piston 2, and prevents water from flowing in the opposite direction. Note that the center through hole 26 becomes a first water channel provided in the second piston of the present invention. Further, in the piston 2, a ring-shaped groove 28 is formed along the outer peripheral surface on the tip side of the rubber seal 23, and a water channel 29 is further formed extending from this groove 28 toward the center. It opens at the periphery of the chamber 36. The groove 28 and the hole 29 constitute the second water channel of the second piston 2 of the present invention.
Note that the ring-shaped groove 28 is formed in the first cylinder 1 when the piston 2 is biased toward the rear end as shown in FIG.
The relative positions of the port 14 and the ring-shaped groove 28 are defined so as to coincide with the port 14 of.

Second cylinder 3 and second piston 4 of this embodiment
The second cylinder 3 and the second piston 4 of the prior art nozzle cylinder described above (FIGS. 8 and 9)
Since it is the same as that shown in Figure), the explanation of its configuration will be omitted.

The structure of the nozzle cylinder of the first embodiment of the present invention is as described above.

In this nozzle cylinder, by introducing pressure water into the port 13, the pressure water flows into the first cylinder chamber 17 through the center through hole 121 of the rear end portion 12 of the first cylinder 1. And the first cylinder chamber 1
The water pressure of 7 drives the first piston 2 in the distal direction (rightward in the figure). On the other hand, the pressure water in the first cylinder chamber 17 flows into the center through hole 26 of the first piston 2 and overcomes the urging force of the spring 242 of the check valve 24 to open the valve 241. The pressure water then flows from the first cylinder 17 into the second cylinder chamber 36 . The second piston 4 is then driven in the distal direction. The state at this time is shown in FIG.

When pressure water is further introduced from port 13, the first
The piston 2 and the second piston 4 move to the most extreme position and stop there. When pressure water is further introduced, the water pressure in the second cylinder chamber 36 increases, overcomes the biasing force of the check valve 44 of the second piston 4, opens the check valve 44, and the pressure water flows into the second piston 4. It flows into the shaft hole 47 of the cylindrical body 42 of No. 4. Then, pressurized water is ejected from a nozzle provided at the tip (not shown) of the second piston. This sprayed washing water is
Used for bidet cleaning.

If the introduction of pressure water is stopped in this state, the water in the first cylinder chamber 17 and the second cylinder chamber 36 will be
The flow flows backward through the first port 13 or the second port 14 and flows out through the throttle valves 132, 141 to the outside or from the nozzle at the tip of the second piston 4,
The first piston 2 and the second piston 4 are urged by springs 22 and 43, respectively, and move toward the rear end,
Return to the rear end position shown in FIG. When pressure water is introduced into the second port 14 and the electromagnetic valve 131 communicating with the first port 13 is stopped, the pressure water flows into the port 14.
The second cylinder chamber 3 passes through the ring-shaped groove 28 and the hole 29 forming the second water channel of the second piston 2.
6. The water pressure in the second cylinder chamber 36 drives the second piston 4 in the distal direction.
Note that the pressure water in the second cylinder chamber 36 is
This prevents the liquid from flowing into the first cylinder chamber 17. Therefore, in this state, the first piston 2 is
It is in a stopped state, and only the second piston 4 is driven in the distal direction. The state at this time is shown in FIG. When the second piston 4 reaches a predetermined position, the second piston 4 stops moving, the water pressure in the second cylinder chamber 36 increases, and the check valve 44 opens against the biasing force of the check valve 44. Axial hole 47 of cylinder body 42
Pressure water flows inside. This pressurized water is then jetted out from a nozzle provided at the tip of the second piston (not shown). In this case, the flushing water is used for anal cleaning.

When the supply of pressure water to the port 14 is cut off, the water in the second cylinder chamber 36 is moved to the second cylinder chamber by the spring 43.
Since the piston 4 is driven toward the rear end, the water flows backward through the port 14 and is drained to the outside through the throttle valve 141. Moreover, the shaft hole 4 of the cylinder body 42 of the second piston 4
The water in 7 is discharged from the nozzle. Then, the second piston 4 is again driven to the rearmost end and returns to the state shown in FIG.

In the nozzle cylinder of this embodiment, a check valve 24 is provided in the center through hole 26 of the first piston 2, and large sliding resistance, sliding friction, etc. do not act on the check valve 24. Therefore, the durability of the check valve 24 is excellent. Therefore, the nozzle cylinder of this embodiment has excellent durability.

Embodiment 2 A nozzle cylinder according to a second embodiment of the present invention is shown in FIGS. 4 to 6. This nozzle cylinder also includes a first cylinder 1, a first piston 2, a second cylinder 3, and a second piston 2.
It is composed of a piston 4. Compared to the nozzle cylinder of the first embodiment, the nozzle cylinder of this second embodiment has the mounting position of the first port 14' changed and the part of the first piston 2 constituting the second water channel changed. be. The other configurations and parts are the same as the nozzle cylinder of the first embodiment. That is, the second port 14' of the first cylinder 1 of this embodiment is provided on the outer wall of the cylinder portion 11 further toward the tip than the position where the first piston 2 is driven to the tip, and It communicates with the inside of the cylinder chamber 17. Further, the second water channel of the first piston 2 includes a ring-shaped groove 28 provided on the outer peripheral surface of the tip side of the rubber seal 23 of the first piston 2;
A hole 29 extending from the groove toward the center and opening from its tip to the peripheral edge of the second cylinder chamber 36, a groove 28 provided on the outer peripheral surface of the first piston 2 parallel to the axis, and a tip side of the second piston 2. A groove 281 communicates with the first piston chamber 17 located in the first piston chamber 17 .

The other parts and configurations of the parts are the same as those of the first embodiment.

The configuration of the nozzle cylinder of the second embodiment is as described above.

When pressurized water is introduced into the first port 13 of this nozzle cylinder in the same way as the nozzle cylinder of the first embodiment, the first piston 2 is urged in the distal direction by the pressure of the pressure water that has flowed into the first cylinder chamber 17. Furthermore, the check valve 24 of the first piston 2 is opened to allow pressurized water to flow into the second cylinder chamber 36, and the pressure causes the second piston 4 to be driven in the distal direction. This state is shown in FIG. Then, both the first piston and the second piston reach the most extreme position and stop. 1st
Pressure water further introduced through the port 13 increases the pressure in the second cylinder chamber 36, and this water pressure opens the check valve 44 against the biasing force of the check valve 44, causing the cylinder of the second piston 4 to open. It flows into the shaft hole 47 of the shaft 42 and is ejected from the nozzle hole 48 at the tip of the second piston 4. This spouted water becomes bidet cleaning water.

Also, when pressure water is sent to the second port 14', the pressure water flows from the second port 14' into the first cylinder chamber 17a at the tip, and further flows through the grooves 281, 28 and the hole 29.
Pressure water flows into the second cylinder chamber 36 through the second cylinder chamber 36 . This pressure water drives the second piston 4 in the distal direction. However, the check valve 24 provided on the second piston 2 prevents the pressure water from flowing into the first cylinder chamber 17 located on the rear end side of the first piston 2 . The first piston 2 is therefore in a driven state. The state at this time is shown in FIG. Pressure water is further introduced from port 14', and the second piston 4
When the piston reaches the most extreme position and stops, the pressure of the pressure water in the second cylinder chamber 36 increases, the check valve 44 opens against the biasing force of the check valve 44, and the cylindrical body 42 of the second piston 4 Pressure water flows into the shaft hole 47 and is jetted out from the nozzle 48 at the tip. This spouted water becomes water for anal cleaning.

In the nozzle cylinder of the second embodiment, after introducing pressure water from the first port 13 shown in FIG. 6 and driving the first piston 2 and the second piston 4 to the most extreme positions, When pressure water is introduced into the second port 14' by closing the solenoid valve 141 and opening the solenoid valve 141, the water in the first cylinder chamber 17 located on the rear end side of the first piston 2 flows into the first piston 2.
The first piston 2 is urged toward the rear end by the spring 22 urging the first piston 2 and the pressure water introduced from the second port 14', and water flows out through the throttle valve 132. The first piston 2 is then driven to the rearmost position and stops. In this state, the water pressure in the second cylinder chamber 36 increases, the check valve 44 opens, and the water that has flowed into the shaft hole 47 flows out from the nozzle 48 . In this state, anal cleaning is possible.

In this way, in the nozzle cylinder of the second embodiment, by changing the position of the second port 14 of the nozzle cylinder of the first embodiment, the nozzle in the bidet cleaning position can be immediately moved to the anus cleaning position. can do.

Also, in the nozzle cylinder of the second embodiment, the check valve 24 provided in the center through hole of the first piston 2
has high durability because sliding friction etc. do not act on it. Therefore, the nozzle cylinder of this embodiment has high durability.

[Brief explanation of the drawing]

FIGS. 1 to 3 show a nozzle cylinder according to a first embodiment of the present invention, and FIG. 1 is a cross-section of the main part in a state where the first piston and the second piston are biased to the rearmost position. Figure 2 shows the second piston 4.
FIG. 3 is a cross-sectional view of main parts showing a state in which the first piston 2 is driven in the distal direction and the first piston 2 is biased to the rear end position. 4 to 6 show a nozzle cylinder according to a second embodiment of the present invention, FIG. 4 is a partially cutaway sectional view thereof, and FIG. 5 shows the first piston. FIG. 6 is a cross-sectional view of the main part when the piston 2 is biased to the rearmost position and the second piston 4 is driven in the distal direction, and FIG. 6 shows when both the first piston 2 and the second piston 4 are driven in the distal direction FIG. 7 is an overall conceptual diagram of a human body private parts cleaning device using a nozzle cylinder, and FIGS. 8 and 9 show a nozzle cylinder existing as prior art.
FIG. 8 is a partially cutaway sectional view showing a state where the first piston 200 is at the rear end position and the second piston 4 is driven in the distal direction, and FIG. 9 is a partially cutaway sectional view showing the state in which the first piston 200 and the second piston 4 are both driven in the distal direction FIG. 3 is a partially cutaway sectional view showing a state when the vehicle is driven. 1...First cylinder, 2...First piston, 3
...Second cylinder, 4...Second piston, 13,
14, 14'... Port, 24, 44... Check valve, 100... First cylinder, 200... First piston.

Claims (1)

[Scope of Claims] 1. A first cylinder whose rear end is sealed; and a first piston that is slidably mounted in a first cylinder chamber of the first cylinder and has a central through hole that is biased toward the rear end. , a second cylinder integrally formed with the first piston, a nozzle that is slidably attached to the second cylinder chamber of the second cylinder and that spouts water at its tip, and a shaft hole that communicates with the nozzle. and a tubular second piston urged at the rear end, the second piston protrudes by introducing pressure water into the second cylinder chamber on the rear end side of the second piston, and The first piston and the second piston protrude in two stages by introducing pressure water into the first cylinder chamber on the rear end side of the first piston and the second cylinder chamber on the rear end side of the second piston. In a nozzle cylinder of a human body private parts cleaning device, the second piston protrudes at a time, and water is selectively ejected from a nozzle at the tip of the second piston to one of two private parts of the human body, after the first cylinder. The end portion has a port for a first hydraulic water passage that opens into the first cylinder chamber, and the rear end portion of the first piston connects the first cylinder chamber on the rear end side of the first piston and the second cylinder chamber. A first waterway connecting the first waterway and a first waterway provided within the first waterway.
It has a check valve that only allows water to flow from the cylinder chamber to the second cylinder chamber, and the rear end of the second cylinder has a second water channel port that opens to the rear end of the second cylinder chamber. A nozzle cylinder for a human body private parts cleaning device. 2. The nozzle cylinder according to claim 1, wherein the check valve is a differential pressure opening/closing valve that opens when the water pressure difference exceeds a certain level. 3. The second hydraulic waterway has a through hole penetrating the side wall of the first cylinder, a first cylinder chamber at the tip of the rear end of the first piston, and a rear end of the first piston provided at the rear end of the first piston or the second cylinder. The nozzle cylinder according to claim 1, which is constituted by a second water channel connecting the first cylinder chamber at the tip end of the end portion and the rear end of the second cylinder chamber. 4. The nozzle cylinder according to claim 3, wherein the second water channel has a check valve that only allows water to flow into the second cylinder chamber.