JPH0928648A - Washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent siphonic phenomenon that is caused by the temporary stoppage of a drainage pump. SOLUTION: A double check valve device 23 and an exhaust duct 36 communicate with each other by a hose 37 for a siphon breaker. One end of this hose 37 is connected to the attaching hole of the double check valve device 23 through a connecting cheese, and the other end is connected to a connecting port formed in the exhaust duct. Siphonic phenomenon is prevented, even with the temporary stoppage of a pump during a draining operation by a drainage pump 18 or an overflow pump 20, because the outside air is taken into the double check valve device 23 through the exhaust duct 36 and the siphon breaker hose 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer for mainly washing containers such as a washer for washing dishes and a washer for washing medical and laboratory instruments such as flasks and test tubes.

[0002]

2. Description of the Related Art Conventionally, as one of the general structures of this type of cleaning machine, there is, for example, the structure of an instrument cleaning machine described in Japanese Patent Laid-Open No. 62-282683.

That is, in this equipment cleaning machine, a cleaning nozzle (injection device) for injecting cleaning water into the equipment is arranged in a cleaning tank for accommodating the equipment such as a flask and a test tube, and surrounds the cleaning tank. Inside the casing, below the cleaning tank, a cleaning pump (water pump) for supplying water to the cleaning nozzle.
Also, a drainage pump (first drainage pump) that is connected to the bottom of the cleaning tank and discharges the cleaning water in the cleaning tank to the outside of the machine is arranged.

In addition, an overflow port (overflow port) opening at a predetermined height from the bottom surface of the cleaning tank is provided in the cleaning tank, and similarly, an overflow port is connected below the cleaning tank to this overflow port. An overflow pump (second drainage pump) for discharging the water overflowing from the overflow port to the outside of the machine is arranged.

The drainage pipe connected to the discharge port of the drainage pump and the drainage pipe connected to the discharge port of the overflow pump are connected to the double check valve device, and are connected to the outlet of the double check valve device. The drain hose outside the machine is connected. A check valve is provided at each of the inlets to which the drain pipes of the two-way check valve device are connected so that water flowing from the drain pump side does not flow to the overflow pump side. The water flowing from the side does not flow to the drain pump side.

[0006]

However, in the above-mentioned equipment washing machine, when the drainage pump is operated during the drainage stroke or when the overflow pump is operated during the water rinsing (overflow rinse) stroke, these pumps are used. Drainage may not stop due to the siphon phenomenon even when is temporarily stopped. For this reason, for example, even if you notice that an external drain hose is not well connected to the drainage pipe of the building and pause it, or if you notice a break of the drain hose and pause, There is a possibility that it may not be possible to stop the water leakage and prevent water leakage.

In addition, during cleaning or rinsing, if a strong negative pressure is generated in the drainage pipe of the building to which the drainage hose is connected for some reason, the water in the cleaning bath will be drawn into the drainage pipe of the building, and There was a risk that the amount of water would decrease and the washing operation could not be performed.

The present invention relates to a washer such as a dish washer and a utensil washer, and solves such a problem.

[0009]

According to a first aspect of the present invention, there is provided a cleaning tank for accommodating an object to be cleaned such as tableware and experimental / medical instruments, and the cleaning tank disposed in the cleaning tank. An injection device for injecting cleaning water or rinsing water onto the object to be cleaned, a water pump for sending the cleaning water or rinsing water stored at the bottom of the cleaning tank to the injection device, and a cleaning water or rinsing water in the cleaning tank A drainage pump for discharging to the outside, a drainage pipe connected to the discharge port of this drainage pump, an exhaust port provided in the cleaning tank for exhausting air from the inside of the cleaning tank, and an exhaust gas from this exhaust port. In a washing machine having an exhaust duct that leads to the outside of the machine, one end is connected to the middle of the drain pipe and the other end is connected to the exhaust duct, and a communication pipe that connects the drain pipe and the exhaust duct is provided. It has a different structure.

According to a second aspect of the present invention, in the configuration of the first aspect, the exhaust duct is bent once after exiting from the exhaust port, and the other end of the communicating pipe is located at a position behind the bending point. It is a configuration in which is connected.

According to a third aspect of the present invention, a cleaning tank for storing objects to be cleaned such as tableware and experimental / medical instruments, and a cleaning tank disposed in the cleaning tank for cleaning water An injection device for injecting rinsing water, a water pump for sending the cleaning water or rinsing water stored at the bottom of the cleaning tank to the injection device, and a cleaning water or rinsing water in the cleaning tank, which is connected to the bottom of the cleaning tank. A first drainage pump for discharging the water to the outside of the machine, an overflow port provided in the cleaning tank at a predetermined height from the bottom of the cleaning tank, and the water overflowing the overflow port is discharged to the outside of the machine. A second drainage pump, a first drainage pipe connected to the discharge port of the first drainage pump, a second drainage pipe connected to the second drainage pump, two inlets and one outlet A check valve is provided at each inlet, and the first drain pipe is provided at one inlet and A double check valve device in which the second drain pipes are connected to the respective inlets, an exhaust port provided in the cleaning tank for exhausting air from the cleaning tank, and an exhaust from the exhaust port In a washing machine provided with an exhaust duct leading to the outside, one end is connected to a downstream side of each check valve of the two-way check valve device and the other end is connected to the exhaust duct, and two check valves are connected. This is a configuration including a communication pipe that connects the valve device and the exhaust duct.

[0012]

[Function] Even if the drain pump is temporarily stopped during the drain operation by the drain pump (first drain pump, second drain pump)
Outside air is discharged through the exhaust duct and the communication pipe to the drain pipe (2
It is taken into the continuous check valve device), which prevents the siphon phenomenon.

Further, even if the inside of the drainage pipe of the building where the drainage pipe from the drainage pump is finally connected during cleaning or rinsing becomes a large negative pressure for some reason, as in the above case, the external pressure is increased via the exhaust duct and the communication pipe. Air is taken into the drain pipe (double check valve device), and this air is drawn into the drain pipe of the building. As a result, the water in the cleaning tank is not drawn into the drain pipe of the building, It is possible to prevent the water in the cleaning tank from decreasing.

Moreover, during drainage, part of the drainage enters the communication pipe from one end side connected to the drainage pipe, so if the other end of the communication pipe is taken out of the machine, water will flow around the equipment. However, since the other end of the communication pipe is connected to the exhaust duct here, even if water leaks from the other end, the water is returned to the washing tank through the exhaust duct.

Further, at the time of cleaning and rinsing, the cleaning water and rinsing water sprayed from the spraying device enter the exhaust duct, but the exhaust duct bends once after exiting from the exhaust port, and behind the bending point. Since the other end of the communication pipe is connected to the position of, the water does not easily reach the communication pipe, and the water in the cleaning tank is not discharged through the communication pipe and reduced.

Furthermore, when both the first drainage pump for discharging the cleaning water (rinsing water) from the bottom of the cleaning tank and the second drainage pump for discharging the water overflowing the overflow port in the cleaning tank are provided, , The first drain pipe and the second drain pipe connected to each are integrated by a double check valve device, and one end of the communication pipe is connected to the downstream side of the check valve in the double check valve device. Therefore, it is possible to prevent siphon phenomenon in both drainage paths and to prevent drawing due to negative pressure by one communicating pipe.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 is an instrument washer which is an embodiment of the washer of the present invention. The instrument washer 1 is for washing instruments such as flasks and test tubes for medical / experimental use.

Reference numeral 2 is a cleaning tank, the front surface of which is closed by a door 3 which can be opened and closed. Reference numeral 4 denotes a front opening-like casing that surrounds the cleaning tank 2, and 5 denotes a front face of the casing 4, which is attached to a position below the door 3 with screws (not shown). Is a front plate that covers the.

Reference numerals 6 and 7 are an upper rack and a lower rack which are housed in the upper and lower stages of the cleaning tank 2, respectively.
These racks are for storing flasks and test tubes to be washed.

Reference numeral 8 is an upper nozzle which is attached to the outer bottom of the upper rack 6 so as to be rotatable in the horizontal direction. The upper nozzle 8 has a plurality of injection ports on the upper surface and the lower surface, respectively, and injects cleaning water (rinsing water) to the instruments in the upper rack 6 and the lower rack 7. The number of injection ports on the bottom is
It is half the number of injection ports on the upper surface. The receiving port 9a of the upper nozzle shaft 9, which is a water shaft and a support shaft for the upper stage nozzle 8, has the upper rack 6
Is stored at a predetermined position in the cleaning tank 2, and is connected to the water supply port 10 provided on the top surface of the tank.

Reference numeral 11 denotes a lower nozzle which is horizontally rotatably arranged at the bottom of the cleaning tank 2. The lower nozzle 11 has a plurality of ejection ports on the upper surface, and injects cleaning water (rinsing water) to the equipment in the lower rack 7. The lower nozzle 11 is attached to a lower nozzle shaft 12 that is a water pipe that also serves as a support shaft that is erected from the bottom of the cleaning tank 2.

The upper nozzle 8 and the lower nozzle 11
Corresponds to the injection device of the present invention. 13 is the cleaning tank 2
A water reservoir portion 14 formed on the bottom surface of the filter is a filter provided at the inlet to the water reservoir portion 13. Reference numeral 15 is a cleaning pump which serves as the water supply pump of the present invention, and the suction port is the circulation pipe 1
6 is connected to the bottom of the water reservoir 13 and the discharge port is a water supply pipe 17 for the water supply port 10 and the lower nozzle shaft 1.
It is connected to 2.

Reference numeral 18 is a drainage pump connected to the bottom of the water reservoir 13. Reference numeral 19 denotes an overflow port (corresponding to the overflow port of the present invention) opened at a predetermined height from the bottom surface of the cleaning tank 2, and 20 denotes an overflow pump connected to this overflow port 19. The drainage pump 18 corresponds to the drainage pump of claim 1 of the present invention and also corresponds to the first drainage pump of claim 3 of the present invention. Further, the overflow pump 20 corresponds to the drainage pump according to claim 1 of the present invention and also corresponds to the second drainage pump according to claim 3 of the present invention.

Reference numeral 21 is a first drain pipe connected to the discharge port of the drain pump 18, and 22 is the overflow pump 2.
It is the 2nd drainage pipe connected to the discharge port of 0.

Reference numeral 23 is a double check valve device to which the first drain pipe 21 and the second drain pipe 22 are connected. As shown in FIGS. 2 and 3, the double check valve device 23 includes a first inflow port 42 to which the first drain pipe 21 is connected and a second flow port to which the second drain pipe 22 is connected. It comprises an inlet 43, an inflow chamber 44 into which water flows from these two inlets, and an outlet 45 connected to an external drain hose. The first inlet 4
Check valves 46 and 46 are provided between the second and second inflow ports 43 and the inflow chamber 44, respectively. The check valves 46, 46 are provided only when water flows from the inlet side.
The water is released as shown by the chain double-dashed line in FIG. 3, and the water flowing from the drain pump 18 side is overflow pump 2
In order not to flow to the 0 side, the overflow pump 20
The water flowing from the side is prevented from flowing to the drain pump 18 side. The first drain pipe 21 and the second drain pipe 21
The drain pipe 22 is connected to an external drain hose via the double check valve device 23, and finally is connected to a drain pipe installed in the building.

Reference numeral 47 denotes the inflow chamber 44 which is downstream of the check valves 46, 46 in the double check valve device 23.
Is a mounting hole provided on the side wall of the. A hose for a siphon breaker described later is attached to the attachment hole 47. It should be noted that the drainage path constituted by the first drainage pipe 21, the second drainage pipe 22, and the double check valve device 23 corresponds to the drainage pipe of claim 1 of the present invention.

Reference numeral 24 is a hot water supply detergent supply box, and 25 is a water supply detergent supply box. These supply boxes are provided on the side surface of the cleaning tank 2, and include detergent, finishing agent, disinfectant, neutralizer, etc. It is for accommodating. 26, 27 and 28
Are a hot water supply port, a water supply port, and a pure water supply port provided on the rear surface of the cleaning tank 2, respectively.

Reference numeral 29 is a hot water supply pipe for supplying hot water from the external hot water source such as a water heater to the hot water supply detergent input box 24 and the hot water supply port 26, and 30 is an electromagnetic hot water supply provided in the middle of the hot water supply pipe 29. It is a valve. This electromagnetic hot water supply valve 30 supplies hot water from the detergent supply box 24 for hot water supply into the cleaning tank 2 or the hot water supply port 2
It is for switching between supplying hot water from the cleaning tank 2 to the cleaning tank 2 or stopping hot water supply. The hot water supplied to the hot water supply detergent supply box 24 is washed with the detergent and the like in the cleaning tank 2
Is supplied in.

Reference numeral 31 is a water supply pipe for supplying water to the detergent supply box 25 for water supply and the water supply port 27 from an external water supply source such as tap water, and 32 is an electromagnetic water supply valve provided in the middle of the water supply pipe 31. Is. The electromagnetic water supply valve 32 supplies water from the detergent supply box 25 for water supply into the cleaning tank 2 or the water supply port 27.
To switch between supplying water into the cleaning tank 2 or stopping water supply. The water supplied to the detergent feed box 25 for water supply is supplied into the cleaning tank 2 together with the detergent and the like.

Reference numeral 33 is a pure water supply pipe for supplying pure water to the pure water supply port 28, and 34 is an electromagnetic supply valve provided in the middle of the supply pipe 33. This electromagnetic supply valve 34
Is for switching between supplying pure water into the cleaning tank 2 and stopping the supply.

Reference numeral 35 denotes an exhaust port provided on the rear surface of the cleaning tank 2 for discharging the steam generated during operation from the cleaning tank 2, and 36 guides the steam discharged from the exhaust port 35 to the outside of the machine. It is an exhaust duct for.

As shown in FIG. 4, the exhaust duct 36 is formed in a substantially L-shaped cross section in which the duct exiting from the exhaust port 35 is bent and directed upward in order to exhaust air from the top surface of the housing 4. There is. In the exhaust duct 36, a connection port 48 is provided on the wall of the duct 36a that is rearward, that is, upward of the bending point, and connects a hose for a siphon breaker described later.

Reference numeral 49 denotes a water scattering prevention wall formed in the exhaust duct 36. The water scattering prevention wall 49 is a water scattering prevention wall 49 in which cleaning water sprayed from the upper nozzle 8 and the lower nozzle 11 is washed. It is for preventing invasion into the inside.

Reference numeral 37 is a hose for a siphon breaker which connects the double check valve device 23 and the exhaust duct 36. The siphon breaker hose 37 corresponds to the communication pipe of the present invention. As shown in FIGS. 2 and 3, one end of the hose 37 for siphon breaker is connected to the mounting hole 47 through a cheese 37a for connection, and the other end is
As shown in FIG. 4, it is connected to the connection port 48.

The inside diameter of the siphon breaker hose 37 is about 4 mm, while the inside diameters of the first drain pipe 21 and the second drain pipe 22 are 16 mm. That is, the siphon breaker hose 37 is made considerably thinner than the drain pipes 21 and 22, so that drainage does not flow into the siphon breaker hose 37 from the drain pipes 21 and 22 side during drainage.

Reference numeral 38 is a control box disposed below the front portion of the cleaning tank 2 and in front of the load such as the cleaning pump 15 and the drainage pump 18. The control box 38 is mounted on a mounting table 39 attached to the bottom surface of the housing 4. Further, the control box 38 includes a storage case 40 in which electric components such as a printed circuit board, a power transformer, and a relay in which small electronic components such as a microcomputer are mounted, and a waterproof cover 41 which covers the storage case 40 from above. It is configured.

The electrical components inside the storage case 40 are for controlling the driving of loads such as the cleaning pump 15, the drainage pump 18, the overflow pump 20, and the like.

The waterproof cover 41 has a box-like shape with an open lower surface.
When water leaks from the cleaning tank 2, this water is stored in the storage case 4
It is for preventing the intrusion into the zero.

With the above construction, during the drainage process, the drainage pump 18 operates, and the water in the cleaning tank 2 used for cleaning and rinsing is taken into the drainage pump 18 from the bottom, It is discharged to the outside of the machine through the drain pipe 21 and the double check valve device 23. In addition, during the rinsing process of pouring water in which rinsing is performed while supplying water (hot water), the overflow pump 2
0 operates, the water overflowing from the overflow port 19 is taken into the overflow pump 20, and the second drain pipe 2
It is discharged to the outside of the machine through the double check valve device 23.

At this time, even if the pump is temporarily stopped during the drainage operation by the drainage pump 18 or the overflow pump 20, the exhaust duct 36 and the siphon breaker hose 37 are provided.
Since the outside air is taken into the double check valve device 23 via the valve (broken line arrow in FIGS. 3 and 4), the siphon phenomenon is prevented. Therefore, the drainage can be reliably stopped when the drainage pump 18 and the overflow pump 20 are stopped.

In addition, even if the inside of the drainage pipe of the building has a large negative pressure for some reason during cleaning or rinsing, as in the above case, the outside air is double-check valve through the exhaust duct 36 and the siphon breaker hose 37. Taken into the device 23, this air is drawn into the drainage pipe of the building, resulting in
It is possible to prevent the water in the cleaning tank 2 from being drawn into the drain pipe of the building and prevent the water in the cleaning tank 2 from decreasing. Therefore, the cleaning operation can be reliably performed.

Moreover, most of the drainage is 2 when draining.
Although it flows to the outflow port 45 side of the continuous check valve device 23, a part thereof enters the siphon breaker hose 37 from one end side connected to the double check valve device 23 side (solid arrow in FIG. 3). , May leak from the other end. Here, the other end of the hose 37 for siphon breaker is connected to the exhaust duct 36, and even if water leaks from the other end side, the water passes through the exhaust duct 36 and is located at a position lower than the connecting portion with the hose. It is returned from the certain exhaust port 35 into the cleaning tank 2 (solid arrow in FIG. 4). Therefore, there is no risk of water leaking out of the machine.

Further, at the time of cleaning and rinsing, the upper nozzle 8
And the wash water and rinse water sprayed from the lower nozzle 11
Although it enters into the exhaust duct 36 from the exhaust port 35 (the one-dot chain line arrow in FIG. 4), the exhaust duct 36 is bent upward once after exiting from the exhaust port 35, and is located at a position behind the bending point. That is, since the other end of the hose 37 for siphon breaker is connected to the wall of the duct 36a directed upward, it is difficult for water to reach the hose, and the water in the cleaning tank 2 is discharged through the hose 37 for siphon breaker. It doesn't happen that it is reduced. In this embodiment, the water splash prevention wall 49 further suppresses the invasion of washing water and rinsing water into the interior of the exhaust duct 36.

Further, both the drainage pump 18 for discharging the cleaning water (rinsing water) from the bottom of the cleaning tank 2 and the overflow pump 20 for discharging the water overflowing the overflow port 19 in the cleaning tank 2 are provided. The first drain pipe 21 and the second drain pipe 22 connected to each of these pumps are integrated by a double check valve device 23, and on the downstream side of the check valves 46, 46 in the double check valve device 23. Since one end of the siphon breaker hose 37 is connected to a certain inflow chamber 44, it is possible to prevent siphon phenomenon in both drainage paths and to prevent drawing due to negative pressure by one hose.
The structure is simplified.

In the embodiment of the present invention, the instrument washer is used, but the washer of the present invention is not limited to this and may be a dishwasher.

[0047]

According to the first aspect of the washing machine of the present invention, even if the pump is temporarily stopped during the drainage operation by the drainage pump, the outside air is introduced into the drainage pipe through the exhaust duct and the communication pipe. The siphon phenomenon is prevented because it is taken into. Therefore, it is possible to reliably stop the drainage when the drainage pump is stopped.

Further, at the time of cleaning and rinsing, even if the inside of the drainage pipe of the building has a large negative pressure for some reason, outside air is taken into the drainage pipe through the exhaust duct and the communication pipe,
Since this air is drawn into the drain pipe of the building, as a result, the water in the washing tank is not drawn into the drain pipe of the building, and it is possible to prevent the water in the washing tank from decreasing. Therefore, the cleaning operation can be reliably performed.

Moreover, during drainage, part of the drainage may enter the communication pipe from one end side connected to the drainage pipe side and leak out from the other end side. Here, the other end of the communication pipe is It is connected to the exhaust duct, so if water leaks from the other end,
The water passes through the exhaust duct and is returned from the exhaust port into the cleaning tank. Therefore, there is no risk of water leaking out of the machine.

According to the configuration of claim 2 of the washing machine of the present invention, at the time of washing and rinsing, the washing water and rinsing water jetted from the jetting device enter the exhaust duct through the exhaust port. Is bent once after coming out of the exhaust port, and the other end of the communication pipe is connected to the position behind the bending point, so it is difficult for water to reach the communication pipe, and the water in the cleaning tank is connected to the communication pipe. It does not happen that the gas is discharged through the fuel cell and decreases.

According to the third aspect of the washing machine of the present invention, the first drainage pump for discharging the washing water (rinsing water) from the bottom of the washing tank and the water overflowing the overflow port in the washing tank are provided. In the case of having both of the second drainage pumps for discharging, the first drainage pipe and the second drainage pipe connected to each of these pumps are integrated by a double check valve device, and in this double check valve device, Since one end of the communication pipe is connected to the downstream side of the check valve, siphon phenomenon in both drainage paths and pull-in due to negative pressure can be prevented by one communication pipe, and the structure is simplified. .

[Brief description of drawings]

FIG. 1 is a side cross-sectional view showing a configuration of an instrument washer that is an embodiment of a washer of the present invention.

FIG. 2 is a side view showing a configuration of a double check valve device.

FIG. 3 is a view A- of FIG. 2 showing the configuration of the double check valve device.
It is A sectional drawing.

FIG. 4 is a side view showing a configuration of an exhaust duct.

[Explanation of symbols]

2 cleaning tank 4 casing 8 upper nozzle (injection device) 11 lower nozzle (injection device) 15 cleaning pump (water pump) 18 drainage pump (first drainage pump, drainage pump) 19 overflow port (overflow port) 20 overflow pump ( 2nd drainage pump, drainage pump) 21 1st drainage pipe (drainage pipe) 22 2nd drainage pipe (drainage pipe) 23 2 double check valve device (drainage pipe) 35 exhaust port 36 exhaust duct 37 hose for siphon breaker (communication) tube)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tetsuo Sakane 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Takenari Yuki 2-chome, Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5-5 Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A cleaning tank for storing articles to be cleaned such as tableware and experimental / medical instruments, and an injection device which is disposed in the cleaning tank and injects cleaning water and rinse water onto the objects to be cleaned, A water supply pump for sending the cleaning water and rinse water stored at the bottom of the cleaning tank to the injection device, a drainage pump for discharging the cleaning water and rinse water in the cleaning tank to the outside of the machine, and a discharge port of this drainage pump. A washing machine equipped with a connected drain pipe, an exhaust port provided in the cleaning tank for exhausting air from the cleaning tank, and an exhaust duct for guiding the exhaust gas from the exhaust port to the outside of the machine. Is connected in the middle of the drain pipe and the other end is connected to the exhaust duct, and a communication pipe for communicating the drain pipe and the exhaust duct is provided. 2. The washing machine according to claim 1, wherein the exhaust duct is bent once after exiting from the exhaust port, and the other end of the communication pipe is connected to a position behind the bending point. . 3. A cleaning tank for storing objects to be cleaned such as tableware and experimental / medical instruments, and a spraying device which is disposed in the cleaning tank and sprays cleaning water and rinse water onto the objects to be cleaned, A water supply pump that sends the cleaning water and the rinse water stored in the bottom of the cleaning tank to the injection device, and the first drainage that is connected to the bottom of the cleaning tank and discharges the cleaning water and the rinse water in the cleaning tank to the outside of the machine. A pump, an overflow port provided in the cleaning tank and opening to a predetermined height from the bottom of the cleaning tank, a second drainage pump for discharging water overflowing from the overflow port to the outside of the machine, and the first A first drain pipe connected to the discharge port of the drain pump, a second drain pipe connected to the second drain pump, two inlets and one outlet, and each inlet is provided with a check valve. The first drain pipe is provided at one inlet and the second drain pipe is provided at the other inlet. A double check valve device connected in series, an exhaust port provided in the cleaning tank for exhausting air from the cleaning tank, and an exhaust duct for guiding the exhaust gas from the exhaust port to the outside of the machine. In the washing machine, one end is connected to a downstream side of each check valve of the double check valve device and the other end is connected to the exhaust duct to connect the double check valve device and the exhaust duct. A washer equipped with a communication pipe.