CN114343538A - Tableware cleaning machine - Google Patents

Abstract

The invention provides a dish washing machine, which can restrain the bad condition of the components in the shell even when the water flows into the air inlet path from the reverse flow preventing device. The dish washing machine (1) is provided with a housing (9), a washing tank (7), a water supply pipe (P1), a drain pipe (P2), a surplus water treatment unit (50), a backflow prevention device (30), and an air introduction path (40) having one end (45) communicating with the backflow prevention device. The backflow prevention device is configured to: the reverse flow from the 2-time water supply pipe (P12) to the 1-time water supply pipe (P11) is prevented, and air is introduced into the water supply pipe through the air introduction passage when the pressure in the 1-time water supply pipe becomes negative: 2 water supply pipes, an intermediate chamber (533) provided between the 1 water supply pipe and the 2 water supply pipes, or the 1 water supply pipe and the 2 water supply pipes. The other end (46) of the air introduction path communicates with a communicating object, which is a washing tank, a drain pipe, or an excess water treatment unit.

Description

Tableware cleaning machine

Technical Field

The present invention relates to a dishwasher.

Background

An example of a conventional dish washing machine is disclosed in japanese patent application laid-open No. 2019-205689. The tableware cleaning machine is provided with a shell, a cleaning tank, a water supply pipe, a water discharge pipe and an air interruption device.

The cleaning tank is arranged in the shell. The washing tub can accommodate objects to be washed such as dishes. The water supply pipe is connected to a water supply port, not shown, provided in the cleaning tank, and supplies water into the cleaning tank. The drain pipe discharges water supplied into the wash tank, i.e., wash water, to the outside of the casing.

The air interruption device is arranged in the middle of the water supply pipe. The air shutoff device prevents backflow from a portion of the water supply pipe on a downstream side of the air shutoff device toward a portion of the water supply pipe on an upstream side of the air shutoff device.

Further, although the specific structure of the air-shut-off device is not clear in japanese patent application laid-open No. 2019-205689, for example, one end of an air introduction path is connected to the air-shut-off device, and the other end of the air introduction path is open in the case. In this air shutoff device, when the portion of the water supply pipe on the upstream side of the air shutoff device becomes negative pressure, air is introduced into the portion of the water supply pipe on the downstream side of the air shutoff device through the air introduction passage.

However, in the above-described conventional dishwasher, when the water pressure or flow rate of the water flowing into the air shutoff device abruptly changes or decreases due to some reason while the water is being supplied into the washing tub by the water supply pipe, the water may flow into the air introduction path from the air shutoff device. In this case, the water flowing into the air introduction passage passes through the air introduction port and adheres to or penetrates into the components such as the mechanical components and the electrical components in the case, which may cause problems such as contamination and corrosion of the components in the case.

Disclosure of Invention

Accordingly, one non-limiting object of the present invention is to provide: even when the waste water flows into the air introduction path from the backflow prevention device, the occurrence of defects in the components in the housing can be suppressed. This object is achieved by the teaching of claim 1. Further developments of the invention are described in the dependent claims.

The dish washing machine of the present invention comprises: a housing; a cleaning tank provided in the housing, capable of accommodating an object to be cleaned, and provided with a water supply port and an excess water discharge port; a water supply pipe connected to the water supply port and supplying water into the cleaning tank; a drain pipe for discharging washing water, which is water supplied into the washing tub, to the outside of the casing; an excess water treatment unit that moves the washing water supplied into the washing tub to the outside of the washing tub through the excess water discharge port as excess water when a water level of the washing water exceeds an upper limit water level, and performs a storage treatment of storing the excess water in a storage unit provided in the casing or a guide treatment of guiding the excess water to the drain pipe; a backflow prevention device provided in the middle of the water supply pipe; and an air introduction passage having one end communicating with the backflow prevention device, wherein a portion of the water supply pipe on an upstream side of the backflow prevention device is 1 water supply pipe, and a portion of the water supply pipe on a downstream side of the backflow prevention device is 2 water supply pipes, and the backflow prevention device is configured to: preventing a reverse flow from the 2-time water supply pipe to the 1-time water supply pipe, and introducing air into the water supply pipe through the air introduction passage when the pressure inside the 1-time water supply pipe becomes negative: the second water supply pipe, the intermediate chamber provided between the first water supply pipe and the second water supply pipe, or the first water supply pipe and the second water supply pipe, wherein the other end of the air introduction passage is communicated with a communicating object, the communicating object being the cleaning tank, the drain pipe, or the excess water treatment unit.

In the dishwasher of the present invention, the backflow prevention device is configured to: (1) introducing air into the water supply pipe 2 times through the air introduction passage when the pressure in the water supply pipe 1 time becomes negative; (2) introducing air into an intermediate chamber provided between the 1 st water supply pipe and the 2 nd water supply pipe through an air introduction passage when the pressure in the 1 st water supply pipe becomes negative; or (3) when the pressure in the 1 st water supply pipe becomes negative, air is introduced into the 1 st water supply pipe and the 2 nd water supply pipe through the air introduction passage. In this dishwasher, when the water pressure or flow rate of the water flowing into the backflow prevention device abruptly changes or decreases due to some reason while the water is being supplied into the washing tub by the water supply pipe, the water may flow from the backflow prevention device into the air introduction passage. However, in this dishwasher, the other end of the air introduction path communicates with the washing tub, the drain pipe, or the excess water treatment unit, i.e., the communicating object, and therefore, even in this case, the water flowing into the air introduction path can be kept away from the components in the housing. As a result, the water flowing into the air introduction path is less likely to adhere to the components in the housing and less likely to enter the housing.

Therefore, in the dishwasher of the present invention, even when the toilet water flows from the backflow prevention device into the air introduction passage, it is possible to suppress occurrence of a failure in the components in the housing.

In another aspect of the present invention, it is preferable that the backflow prevention device cuts off the 1-time water supply pipe when the negative pressure is generated in the 1-time water supply pipe, and introduces air into the 2-time water supply pipe or the intermediate chamber through the air introduction passage.

In this case, the backflow into the water supply pipe 1 time after the negative pressure is reached can be prevented with high reliability.

In another aspect of the present invention, it is preferable that the dish washing machine of the present invention further includes a treatment agent supply device provided in the middle of the 2-time water supply pipe, and configured to mix the treatment agent into the water supplied into the washing tub to supply the treatment agent into the washing tub.

When the treating agent supply device having a large loss of water pressure is provided in the middle of the 2-time water supply pipe, there is a possibility that the water pressure or flow rate of the water flowing into the backflow prevention device may be easily changed or decreased rapidly due to some reason during the supply of the water into the cleaning tank by the water supply pipe. In this regard, in the dish washing machine according to the present invention, even when the above-described configuration is adopted, the backflow preventing means can reliably prevent the occurrence of a failure in the components in the housing, even if the waste water flows into the air introduction passage.

In another aspect of the present invention, it is preferable that the other end of the air introduction path communicates with the communication target through the 1 st communication port. Further, it is preferable that the lowermost end of the 1 st communication port is located above the lowermost end of the surplus water discharge port.

In this case, it is possible to suppress: when the negative pressure is generated in the water supply pipe 1 time, the dirty washing water flows back from the communication object to the backflow prevention device through the 1 st communication port and the air introduction passage.

In another aspect of the present invention, it is preferable that one end of the air introduction passage communicates with the backflow prevention device through the 2 nd communication port. Further, it is preferable that the lowermost end of the 2 nd communication port is located above the lowermost end of the surplus water discharge port.

In this case, it is possible to suppress: when the negative pressure is generated in the water supply pipe 1 time, the dirty washing water flows back into the backflow prevention device from the communicating object through the air introduction path and the 2 nd communication port.

In other modes of the present invention, it is preferable that the front of the housing is open. Preferably, the dish washing machine of the present invention further includes a movable body movable between a storage position stored in the housing and a pull-out position moved forward from the storage position. Preferably, the cleaning tank is provided to the moving body and has an opening opened upward. Preferably, the backflow prevention device is provided on the movable body at a position further to the rear than the rear wall of the cleaning tank.

The dish washing machine in this case is of a so-called slide-open type. Further, with this configuration, the front surface of the movable body and the front surface of the cleaning tank can be made close to each other in the front-rear direction, compared to a case where the backflow prevention device is provided on the movable body at a position on the front side of the front surface of the cleaning tank. As a result, in the dishwasher, it is possible to suppress a problem that the pull-out amount of the movable body increases due to the backflow prevention device being provided in the movable body.

Other aspects and advantages of the present invention will become apparent from the following description and the accompanying drawings, which illustrate embodiments of the invention and are set forth hereinafter, and the whole specification and the concept of the invention disclosed therein.

Drawings

Fig. 1 is a schematic cross-sectional view of a dish washing machine according to embodiment 1, and is a view showing a state in which a movable body is in a storage position.

Fig. 2 is a schematic cross-sectional view of the dish washing machine according to embodiment 1, and is a diagram showing a state in which the movable body is moved to the pulled-out position.

Fig. 3 is a partial perspective view of the washing tub according to the dishwasher of embodiment 1.

Fig. 4 is a sectional view of a vacuum circuit breaker as a backflow prevention device according to the dish washing machine of embodiment 1.

Fig. 5 is a partial perspective view of the washing tub according to the dishwasher of embodiment 2.

Fig. 6 is a partial perspective view of the washing tub according to the dishwasher of embodiment 3.

Fig. 7 is a partial perspective view of the washing tub according to the dishwasher of embodiment 4.

Fig. 8 is a sectional view of a decompression type backflow preventer as a backflow preventing device according to the dish washing machine of embodiment 5.

Fig. 9 is a sectional view of a vacuum circuit breaker as a backflow prevention device according to the dish washing machine of embodiment 6.

Description of the reference numerals

1 … dishwasher; 9 … a housing; TW1 … washed item (tableware) 7S … water supply port; 67D … excess water drain; 7 … cleaning tank; p1 … water supply pipe; a P2 … drain pipe; g1 … upper limit water level; w1 … excess water; 9P … reservoir; 50. 350 … redundant water treatment units; 30. 530, 630 … backflow prevention devices (30, 630 … vacuum circuit breakers; 530 … reduced pressure backflow preventers); 40 … air introduction path; 45 … one end of the air introduction path; p11 … 1 water supply pipe; p12 … 2 water supply pipe; 533 … middle chamber; 46. 246, 346, 446 … the other end of the air introduction path; r1 … treating agent (rinsing agent); 20 … treating agent supply means; 41. 241, 341, 441 …, 1 st communication port; 42. 542 … No. 2 communication port; 6 … moving body; 7H … opening; 7B … cleaning the back wall of the tank.

Detailed Description

Hereinafter, examples 1 to 6 according to the present invention will be described with reference to the drawings.

Example 1

As shown in fig. 1, a dish washing machine 1 according to embodiment 1 is an example of a specific embodiment of the dish washing machine according to the present invention. The dishwasher 1 is a front-drawing type dishwasher provided below a ceiling CT1 of a built-up kitchen.

In the present embodiment, the side of the user in the built-up kitchen facing the housing 9, i.e., the left side of the sheet of fig. 1, is defined as the front of the housing 9, and the opposite side, i.e., the right side of the sheet of fig. 1, is defined as the rear of the housing 9. The side directed to the left in a state where the user faces the casing 9, i.e., the back side in fig. 1, is defined as the left side of the casing 9, and the side directed to the right, i.e., the near side of the paper in fig. 1, is defined as the right side of the casing 9. The front-back direction, the left-right direction, and the up-down direction shown in each of fig. 2 and later are shown corresponding to fig. 1.

Casing, moving body, cleaning tank, door body, and lid body

As shown in fig. 1, dishwasher 1 includes a casing 9, a moving body 6, a washing tub 7, a door 70, and a lid 8.

The housing 9 is a substantially box-shaped body. The upper portion of the housing 9 is covered with a ceiling CT 1. The housing 9 has a housing opening 9H. The case opening 9H is open over a wide range from the upper end to the lower end of the front portion of the case 9, and communicates the inside of the case 9 with the outside.

The moving body 6 is housed in the housing 9. The position of the moving body 6 shown in fig. 1 is set as a storage position. A slide rail mechanism, not shown, is disposed between the side surface of the moving body 6 and the inner wall surface of the housing 9. The movable body 6 is movable by the slide rail mechanism between a storage position shown in fig. 1 and a pull-out position moved forward from the storage position as shown in fig. 2. The moving body 6 is provided with a cleaning tank 7 and a door 70.

As shown in fig. 1 and 3, washing tub 7 is a substantially box-shaped body, and an internal space for washing dishes TW1 is defined by front wall 7A, left and right side walls, and rear wall 7B. Further, cleaning tank 7 has opening 7H for opening the upper part of the internal space thereof.

As shown in fig. 1, door 70 is integrally assembled from the front to front wall 7A of washing tub 7, and is provided in front of washing tub 7. The front surface 70F of the door 70 is a flat surface extending in the vertical direction and the horizontal direction, and constitutes an appearance surface that is touched by the eyes of a user in the built-up kitchen.

A door projection 78 is provided at the upper end of the door 70. The door projection 78 projects forward and upward from an upper portion of the front surface 70F of the door 70. A handle 7G is provided on the front surface of the door body protrusion 78. The handle 7G is gripped by the user when moving the moving body 6 between the storage position shown in fig. 1 and the pull-out position shown in fig. 2.

In the state where moving body 6 is at the storage position shown in fig. 1, door 70 closes housing opening 9H, and cleaning tub 7 is stored in housing 9. Then, by moving body 6 to the pull-out position shown in fig. 2, door 70 opens case opening 9H, and opening 7H of cleaning tub 7 is exposed from case 9.

As shown in fig. 1 and 2, the lid 8 is disposed at an upper portion in the case 9. The cover 8 moves up and down in conjunction with the movement of the moving body 6 by an interlocking mechanism not shown.

When moving body 6 is at the storage position shown in fig. 1, lid 8 is lowered to close opening 7H of cleaning tub 7. On the other hand, the lid 8 is raised when the moving body 6 moves between the storage position shown in fig. 1 and the pull-out position shown in fig. 2, so that the opening 7H is opened and the moving body 6 is allowed to move.

In a state where moving body 6 moves to the pulled-out position shown in fig. 2 and opening 7H of washing tub 7 is exposed from casing 9, the user can accommodate tableware TW1 in washing tub 7 or take tableware TW1 out of washing tub 7 through opening 7H.

The tableware TW1 is, for example, a tableware such as a tea bowl, a plate, and a glass, or a tableware such as a chopstick, a spoon, and a fork. The dish TW1 is an example of the "object to be washed" of the present invention.

The moving body 6 is provided with an automatic detergent supply device, not shown. Detergent for decomposing and washing the dirt adhered to the dishes TW1 is stored in the automatic detergent dispenser. The automatic detergent supply device automatically supplies the stored detergent into the washing tub 7 at a predetermined timing.

Water supply pipe, treating agent supply device, water supply solenoid valve, and drain pipe

As shown in fig. 1, a water supply pipe P1, a treating agent supply device 20, a water supply solenoid valve 69, and a drain pipe P2 are provided in the housing 9.

The water supply pipe P1 extends forward between the bottom wall of the moving body 6 and the bottom wall of the washing tub 7, and is connected to a water supply port 7S provided in the front wall 7A of the washing tub 7. The water supply pipe P1 supplies water from a water supply source, not shown, provided outside the dishwasher 1 into the washing tub 7.

As shown in fig. 1 and 3, a vacuum interrupter 30 is provided in the middle of the water supply pipe P1. The vacuum circuit breaker 30 is an example of the "backflow prevention device" of the present invention. Vacuum circuit breaker 30 is disposed behind rear wall 7B of cleaning tank 7, and is mounted on moving body 6 by being assembled to rear wall 7B via a bracket or the like, not shown.

As will be described in detail later, the water supply pipe P1 has a portion upstream of the vacuum interrupter 30 as the 1-time water supply pipe P11, and the water supply pipe P1 has a portion downstream of the vacuum interrupter 30 as the 2-time water supply pipe P12.

As shown in fig. 1, the treating agent supply device 20 is provided on the movable body 6 at a position in the middle of the 2-time water supply pipe P12 and in front of the water supply port 7S. The treatment agent supply device 20 is housed together with the storage box 10 in: a space between front surface 70F of door 70 and front wall 7A of cleaning tub 7 in moving body 6.

The cartridge 10 is disposed above the treating agent supply device 20, and communicates with the treating agent supply device 20 through a connection pipe 28. A rinsing agent R1 for improving water sheeting property of the tableware TW1 or obtaining gloss after washing is stored in the storage box 10. The rinse agent R1 is an example of the "treating agent" of the present invention. In this embodiment, the rinse agent R1 is a liquid.

Although not shown, the treating agent supply device 20 includes a plurality of solenoid valves, a metering pump, and the like. Each of the solenoid valves switches the flow path of water in the treating agent supply device 20, or switches the supply and stop of the rinse agent R1, when the rinse agent R1 is not mixed into the water supplied into the cleaning tank 7, and when the rinse agent R1 is mixed into the water supplied into the cleaning tank 7. When the rinse agent R1 is mixed into the water supplied into the cleaning tank 7, the metering pump operates to accurately meter and mix the rinse agent R1.

The treating agent supply device 20 configured as described above can supply the rinse agent R1 into the cleaning tank 7 by mixing the rinse agent R1 stored in the storage box 10 into the water supplied into the cleaning tank 7 at a predetermined timing.

The water supply solenoid valve 69 switches between supply and stop of water into the cleaning tank 7 by opening and closing the water supply pipe P1.

As shown in fig. 3, the drain pipe P2 is formed by connecting in series a box-shaped drain pipe P21, P22, P23, which has an inner space formed therein and has an inlet and an outlet, and a flexible tubular drain pipe P24. Drain pipe P2 drains the washing water in washing tub 7 to the outside of dishwasher 1.

As shown in fig. 1, a water storage portion 7P for storing washing water is provided at the bottom of washing tub 7. Further, a dish basket 7C is disposed in washing tub 7. A dish TW1 is placed on the dish basket 7C.

An exhaust passage 7E is provided in the cleaning tank 7. The exhaust passage 7E is open at the front surface 70F of the door body 70 and communicates with the outside of the cleaning tank 7. The air in washing tub 7 is discharged to the outside of the apparatus, i.e., to the front of casing 9, through exhaust passage 7E.

Nozzle and pump

As shown in fig. 1, the dish washing machine 1 further includes a nozzle 61 and a pump 62. The nozzle 61 is disposed in the cleaning tank 7. Pump 62 is assembled below water storage portion 7P of washing tub 7.

Nozzle 61 can spray washing water into washing tub 7 from a plurality of spray holes. In order to reliably wash a plurality of dishes TW1 stacked in washing tub 7 or wash the inner wall surface of washing tub 7 or dish basket 7C, the spraying direction of nozzle 61 may be changed to various directions.

When pump 62 is operated in the forward direction, the cleaning water stored in water storage portion 7P of cleaning tub 7 is supplied to nozzle 61 and sprayed into cleaning tub 7. Since the sprayed washing water is stored in the water storage portion 7P, the washing water is repeatedly supplied to the nozzle 61 by the pump 62. When the pump 62 performs the reverse rotation operation, the washing water in the washing tub 7 is discharged to the outside of the casing 9 through the residual filter 67 and the drain pipe P2.

Heater and drying fan

The dish washing machine 1 further includes a heater 63 and a drying fan 68. Heater 63 and drying fan 68 are also assembled to cleaning tub 7.

The heater 63 is disposed at the bottom of the water storage portion 7P. Heater 63 heats the washing water stored in water storage portion 7P of washing tub 7 or the air in washing tub 7.

As shown in fig. 1 and 3, the cleaning tank 7 integrally has a drying duct 67. Drying duct 67 is assembled from the rear to the right end of rear wall 7B of washing tub 7. An inner space extending in the vertical direction is formed inside the drying duct 67. The lower end of drying duct 67 communicates with water storage portion 7P of washing tub 7 via communication hole 7D opened in the lower portion of rear wall 7B of washing tub 7.

Drying fan 68 is assembled from the rear to the right end portion of rear wall 7B of washing tub 7 in a state of being connected to the upper end of drying duct 67. By rotating drying fan 68 with heater 63 in operation, heated air can be sent into washing tub 7 through drying duct 67 and communication hole 7D, and tableware TW1 can be dried. The air sent into washing tub 7 by drying fan 68 is discharged to the outside of dishwasher 1 through exhaust passage 7E.

Control unit and user interface

As shown in fig. 1, the dishwasher 1 further includes a control unit C1 and a user interface 79. The control portion C1 is disposed below the door protruding portion 78 of the door 70. The user interface 79 is disposed on the upper surface of the door body protrusion 78.

The control unit C1 is an electronic circuit unit including a CPU, a memory, such as a ROM or a RAM, an interface circuit that transmits and receives signals to and from a control target, a power supply circuit that controls power supply to the control target, and the like. The memory stores a program for operating the dishwasher 1, setting information, and the like.

The controller C1 controls and operates the pump 62, the heater 63, the drying fan 68, and the like. The controller C1 controls and operates the automatic detergent supply device and the treatment agent supply device 20, which are not shown, at predetermined timings. Control unit C1 receives monitoring signals from sensors not shown, such as a temperature sensor for controlling heater 63, a water level sensor for monitoring the water level of the washing water in washing tub 7, a position sensor for monitoring whether washing tub 7 is in the storage position, and a lock sensor for monitoring whether washing tub 7 is locked in the storage position.

A reservoir 9P is provided in a recessed manner in the bottom wall of the housing 9, and when water leaks from the inside of the housing 9, the leaked water is stored in the reservoir 9P. The controller C1 receives a monitoring signal from the water leakage sensor S1 that detects the water stored in the reservoir 9P.

The user interface 79 includes an operation instruction unit 79A and a display unit 79B. The operation instructing unit 79A inputs an operation instruction of the dishwasher 1 via a plurality of buttons, and transmits the input result to the control unit C1. The display unit 79B is transmitted with information relating to the operation of the dishwasher 1 from the control unit C1, and displays the information on a liquid crystal panel or the like.

As shown in fig. 1, in a state where the washing tub 7 is in the storage position, the entire user interface 79 is hidden by the ceiling CT1 of the built-up kitchen. Thus, the user cannot operate and visually confirm the user interface 79. By moving the moving body 6 to the pulled-out position shown in fig. 2 so that the entire user interface 79 is moved to a position forward of the ceiling CT1 of the built-up kitchen, the user can operate and visually confirm the user interface 79.

Redundant water treatment unit

In dishwasher 1, a problem that excessive washing water is supplied into washing tub 7 due to a failure in closing water supply solenoid valve 69, a failure in monitoring a water level sensor, not shown, or the like is rare. Therefore, as shown in fig. 1 and 3, an excess water discharge port 67D is provided in the drying duct 67 integrally provided in the cleaning tank 7.

The surplus water discharge port 67D is a rectangular hole opened at a lower side portion of the rear wall of the drying duct 67. The rear wall of the drying duct 67 and the surplus water discharge port 67D are disposed directly above the reservoir 9P.

A rib 67R is formed at a rear wall of the drying duct 67 in such a manner as to protrude rearward. The rib 67R extends in the left-right direction at a position upwardly spaced from the surplus water discharge port 67D, extends downward from the left end thereof, passes by the surplus water discharge port 67D, and protrudes to a position below the lower end of the rear wall of the drying duct 67.

The dishwasher 1 includes a surplus water treatment unit 50. The surplus water treatment unit 50 is constituted by a region from the periphery of the surplus water discharge port 67D to the lower end in the rear wall of the drying duct 67, a rib 67R surrounding the region, and a reservoir 9P.

As shown in fig. 1, the lowermost end of the excess water discharge port 67D is located above the lowermost end of the communication hole 7D. The upper limit water level G1 of the washing water supplied to washing tub 7 is set by the lowermost end of excess water discharge port 67D.

If such a trouble as described above rarely occurs and the water level of the washing water supplied into washing tub 7 exceeds upper limit water level G1, excess water W1 exceeds the lowermost end of excess water discharge port 67D. Then, the excess water W1 moves downward along the rear wall of the drying duct 67 and the rib 67R, and then drops into the reservoir 9P to be stored.

In this way, when the water level of the washing water supplied into washing tub 7 exceeds upper limit water level G1, excess water treatment unit 50 moves as excess water W1 to the outside of washing tub 7 through excess water discharge port 67D, and performs a storage process of storing excess water W1 in storage section 9P.

When the water stored in storage section 9P reaches a predetermined amount or more and water leakage sensor S1 detects the stored water, controller C1 determines that water leakage has occurred in case 9. The control unit C1 notifies the user of water leakage by controlling the display unit 79B of the user interface 79, a sound emitting unit, not shown, and the like, and prompts the user to take measures against water leakage.

Vacuum circuit breaker and air introduction path

As shown in fig. 3 and 4, the vacuum circuit breaker 30 has a housing 39. A downstream end of the 1-time water supply pipe P11 is connected to a connection pipe formed at an upper portion of the housing 39. An upstream end of the 2-time water supply pipe P12 is connected to a connection pipe formed in the middle portion of the housing 39. One end 45 of the air introduction passage 40 is connected to a connection pipe formed at a lower portion of the housing 39.

The internal structure of the vacuum interrupter 30 is well known and therefore the description is simplified. As shown in fig. 4, a valve chamber 39R, which is a substantially cylindrical space extending in the vertical direction, is formed inside the housing 39. The valve chamber 39R is provided with: a communication port 39A communicating with the downstream end of the 1 st water supply pipe P11, and a 1 st valve seat 38A surrounding the communication port 39A. A communication port 39B communicating with the upstream end of the 2-time water supply pipe P12 is provided in an intermediate portion of the valve chamber 39R.

The valve chamber 39R is provided at a lower portion thereof with: a 2 nd communication port 42 communicating with one end 45 of the air introduction passage 40, and a 2 nd valve seat 38B surrounding the 2 nd communication port 42. In the present embodiment, the position in the vertical direction of the lowermost end of the 2 nd communication port 42 is the same as the position in the vertical direction of the 2 nd valve seat 38B. The lowermost end of the 2 nd communication port 42 is located above the lowermost end of the surplus water discharge port 67D.

The movable body 37 is housed in the valve chamber 39R so as to be linearly movable in the vertical direction. A 1 st valve element 36A that can be positioned and separated with respect to a 1 st valve seat 38A is provided on an upper portion of the movable body 37. A 2 nd valve element 36B that can be positioned and separated with respect to a 2 nd valve seat 38B is provided at a lower portion of the movable element 37.

A compression coil spring 37S is provided between the lower end of the valve chamber 39R and the 2 nd valve element 36B. The compression coil spring 37S biases the movable body 37 so that the 1 st valve element 36A is seated on the 1 st valve seat 38A and the 2 nd valve element 36B is separated from the 2 nd valve seat 38B.

As shown in fig. 3, a 1 st communication port 41 is provided at a left end portion of the rear wall 7B of the cleaning tank 7. As shown in fig. 1, the 1 st communication port 41 opens in the cleaning tank 7. The lowermost end of the 1 st communication port 41 is located above the lowermost end of the surplus water discharge port 67D. By disposing the vacuum interrupter 30 above the 1 st communication port 41, the lowermost end of the 2 nd communication port 42 is located above the lowermost end of the 1 st communication port 41.

As shown in fig. 3, the other end 46 of the air introduction passage 40 communicates with the washing tub 7 through the 1 st communication port 41. The cleaning tank 7 communicating with the other end 46 of the air introduction path 40 is an example of the "communicating object" of the present invention.

In the vacuum circuit breaker 30 configured as described above, the movable body 37 is biased by the compression coil spring 37S and held at the position shown in fig. 4 in a state where the water supply solenoid valve 69 is closed and the water supply into the cleaning tank 7 by the water supply pipe P1 is stopped. Thereby, the 1 st valve body 36A is seated on the 1 st valve seat 38A to close the communication port 39A, and the 2 nd valve body 36B is separated from the 2 nd valve seat 38B to open the 2 nd communication port 42. Thus, the vacuum interrupter 30 prevents the reverse flow from the 2-time water supply pipe P12 to the 1-time water supply pipe P11.

When the water supply solenoid valve 69 is opened and water supply into the washing tub 7 is started by the water supply pipe P1, the pressure of the water supply pipe P11 is increased 1 time and the movable body 37 is lowered from the position shown in fig. 4 against the urging force of the compression coil spring 37S. Thereby, the 1 st valve body 36A is separated from the 1 st valve seat 38A to open the communication port 39A, and the 2 nd valve body 36B is positioned on the 2 nd valve seat 38B to close the 2 nd communication port 42. As a result, the water flows from the 1 st water supply pipe P11 toward the 2 nd water supply pipe P12 via the valve chamber 39R.

Thereafter, when the water supply solenoid valve 69 is closed and the water supply pipe P1 stops supplying water into the washing tub 7, the water supply pipe P11 becomes a negative pressure 1 time, and the movable body 37 is biased by the compression coil spring 37S and returns to the position shown in fig. 4. Thereby, the 1 st valve body 36A is seated on the 1 st valve seat 38A to close the communication port 39A, and the 2 nd valve body 36B is separated from the 2 nd valve seat 38B to open the 2 nd communication port 42. In this way, when the pressure in the 1 st water supply pipe P11 becomes negative, the vacuum interrupter 30 cuts off the 1 st water supply pipe P11, and introduces the air in the cleaning tank 7 into the 2 nd water supply pipe P12 through the 1 st communication port 41, the air introduction passage 40, and the 2 nd communication port 42.

Cleaning operation

In the dish washing machine 1 configured as described above, the washing operation is performed in the following order. In this embodiment, the cleaning operation includes a cleaning step, a rinsing step, and a drying step.

In order to store dishes TW1 to be washed in washing tub 7, the user grips handle 7G of door body protrusion 78 and moves moving body 6 to the pulled-out position shown in fig. 2. Then, the user accommodates tableware TW1 in washing tub 7 having opening 7H opened. Then, the user operates the user interface 79 to instruct the start of the cleaning operation, and moves the movable body 6 to the pull-out position shown in fig. 1.

Then, control unit C1 executes the cleaning operation and starts the cleaning step on condition that it is monitored by a position sensor, not shown, that cleaning tank 7 is at the storage position and that cleaning tank 7 is locked at the storage position by a lock sensor, not shown.

In the washing step, the controller C1 opens the water supply solenoid valve 69 to supply water into the washing tub 7 through the water supply pipe P1. At this time, controller C1 automatically puts detergent into washing tub 7 in an amount corresponding to tableware TW1 contained in washing tub 7 by an automatic detergent putting device, not shown. Further, the controller C1 controls the treating agent supply device 20 in the cleaning step to: rinse agent R1 is not mixed into the water supplied into cleaning tank 7.

The vacuum interrupter 30 performs the above-described operation from the start of the supply of water into the cleaning tank 7 by the water supply pipe P1 to the stop.

Controller C1 operates pump 62 to spray washing water from nozzle 61 into washing tub 7, thereby washing dishes TW 1.

When the washing step is finished, controller C1 reverses pump 62 to discharge the washing water in washing tub 7 to the outside of dishwasher 1, and then starts the washing step.

In the rinsing step, the controller C1 opens the water supply solenoid valve 69 to supply water into the cleaning tank 7 through the water supply pipe P1. At this time, the control unit C1 controls the treating agent supply device 20 to: rinse agent R1 is mixed into the water supplied into cleaning tank 7. Thus, treatment agent supply device 20 mixes rinse agent R1 into the water supplied into cleaning tank 7 while accurately measuring the amount of rinse agent R1 corresponding to tableware TW1 contained in cleaning tank 7.

The vacuum interrupter 30 performs the above-described operation from the start of the supply of water into the cleaning tank 7 by the water supply pipe P1 to the stop.

Then, controller C1 operates pump 62 to spray washing water mixed with rinse agent R1 from nozzle 61 into washing tub 7 to wash tableware TW 1.

When the washing step is finished, controller C1 reverses pump 62 to discharge the washing water for washing in washing tub 7 to the outside of dishwasher 1, and then starts the drying step.

In the drying step, controller C1 appropriately operates heater 63 and drying fan 68 to send the heated air into washing tub 7 to dry tableware TW1 in washing tub 7. When the drying step is finished, the controller C1 finishes the washing operation.

In the drying step, rinse agent R1 contained in the water droplets adhering to tableware TW1 at the end of the rinsing step improves water film residue of tableware TW1, and can suppress adhesion of water droplets to tableware TW 1. As a result, the time required for the drying step can be shortened, and generation of water marks (spots) on the dried tableware TW1 due to water droplets adhering to the tableware TW1 can be suppressed. In addition, the gloss component contained in the rinse agent R1 makes it easier to obtain gloss after the dish TW1 is washed.

Effect of action

In the dishwasher 1 of example 1, if the water pressure or flow rate of the water flowing into the valve chamber 39R of the vacuum interrupter 30 from the 1 st water supply pipe P11 abruptly changes or decreases due to some cause while the water is supplied into the washing tub 7 by the water supply pipe P1, the balance between the water pressure acting on the movable body 37 and the compression coil spring 37S may be lost, and the movable body 37 may move upward, and the 2 nd valve element 36B may be separated from the 2 nd valve seat 38B.

In this case, water flows into the air introduction passage 40 from the valve chamber 39R of the vacuum circuit breaker 30 through the 2 nd communication port 42. However, in dishwasher 1, since other end 46 of air introduction path 40 communicates with washing tub 7 as a communication target, even in this case, water flowing into air introduction path 40 can be kept away from the components in case 9. As a result, the water flowing into the air introduction passage 40 is less likely to adhere to the components in the housing 9 and less likely to enter the inside thereof.

Therefore, in the dish washing machine 1 according to embodiment 1, even when the toilet water flows from the vacuum circuit breaker 30 into the air introduction passage 40, it is possible to suppress occurrence of a trouble in the components in the housing 9.

In the dishwasher 1, as shown in fig. 4, the vacuum circuit breaker 30 cuts off the 1-time water supply pipe P11 when the pressure in the 1-time water supply pipe P11 becomes negative, and introduces air into the 2-time water supply pipe P12 through the air introduction passage 40. With this configuration, the backflow into the 1 st water supply pipe P11 that has become a negative pressure can be prevented with high reliability.

In the dish washing machine 1, as shown in fig. 1, the treating agent supply device 20 having a large water pressure loss is provided in the middle of the 2-time water supply pipe P12. Therefore, in the process of supplying water into the cleaning tank 7 through the water supply pipe P1, the water pressure or flow rate of the water flowing into the valve chamber 39R of the vacuum interrupter 30 from the 1 st water supply pipe P11 may be easily changed or decreased rapidly due to some reason. In this regard, in the dishwasher 1, even when the above-described configuration is adopted, that is, the drain water flows from the valve chamber 39R of the vacuum interrupter 30 into the air introduction passage 40 through the 2 nd communication port 42, it is possible to reliably suppress occurrence of a failure in the components in the housing 9.

In the dishwasher 1, as shown in fig. 3, the other end 46 of the air introduction path 40 communicates with the washing tub 7 to be communicated through the 1 st communication port 41. The lowermost end of the 1 st communication port 41 is located above the lowermost end of the surplus water discharge port 67D. With this structure, it is possible to suppress: when the pressure in the 1 st water supply pipe P11 becomes negative, the dirty washing water flows back from the washing tub 7 to be communicated into the valve chamber 39R of the vacuum circuit breaker 30 through the 1 st communication port 41 and the air introduction passage 40.

In the dishwasher 1, as shown in fig. 4, one end 45 of the air introduction path 40 communicates with the valve chamber 39R of the vacuum interrupter 30 through the 2 nd communication port 42. As shown in fig. 3, by disposing the vacuum interrupter 30 above the 1 st communication port 41, the lowermost end of the 2 nd communication port 42 is located above the lowermost end of the excess water discharge port 67D, more specifically, above the lowermost end of the 1 st communication port 41. With this structure, it is possible to suppress: when the pressure in the water supply pipe P11 reaches a negative pressure 1 time, the dirty washing water flows back from the washing tub 7 to be communicated into the valve chamber 39R of the vacuum circuit breaker 30 through the air introduction passage 40 and the second communication port 42.

Further, the dishwasher 1 is a so-called slide-open type dishwasher in which a movable body 6 provided with a washing tub 7 is movable between a storage position shown in fig. 1 and a pull-out position shown in fig. 2. Vacuum circuit breaker 30 is provided on movable body 6 at a position rearward of rear wall 7B of cleaning tub 7. With this configuration, front surface 70F of door 70 and the front surface of front wall 7A of cleaning tank 7 can be brought closer in the front-rear direction than in the case where vacuum circuit breaker 30 is provided on moving body 6 at a position further forward than the front surface of cleaning tank 7. As a result, in the dish washing machine 1, it is possible to suppress a problem that the pull-out amount of the movable body 6 is increased by providing the vacuum breaker 30 to the movable body 6.

Example 2

As shown in fig. 5, in the dish washing machine according to embodiment 2, the 1 st communication port 41 of the dish washing machine 1 according to embodiment 1 is removed from the washing tub 7, and the 1 st communication port 241 is provided in the rib 67R of the drying duct 67 constituting a part of the excess water treatment unit 50.

In example 2, the other end 246 of the air introduction passage 40 communicates with the excess water treatment unit 50 through the first communication port 241 1. The excess water treatment unit 50 communicating with the other end 246 of the air introduction path 40 is an example of the "communication target" of the present invention.

The lowermost end of the 1 st communication port 241 is located above the lowermost end of the surplus water discharge port 67D. By disposing the vacuum interrupter 30 above the 1 st communication port 241, the lowermost end of the 2 nd communication port 42 is located above the lowermost end of the 1 st communication port 241.

The other structure of embodiment 2 is the same as embodiment 1. Therefore, the same reference numerals are given to the same structures as those of embodiment 1, and the description thereof is omitted or simplified.

In the dishwasher of example 2 configured as described above, even when water flows into the air introduction path 40 from the valve chamber 39R of the vacuum interrupter 30 through the 2 nd communication port 42, the other end 246 of the air introduction path 40 communicates with the excess water treatment unit 50 to be communicated through the 1 st communication port 241, and therefore, the water flowing into the air introduction path 40 can be kept away from the components in the housing 9.

Therefore, in the dish washing machine according to embodiment 2, as in the dish washing machine 1 according to embodiment 1, even when the waste water flows into the air introduction passage 40 from the vacuum circuit breaker 30, it is possible to suppress occurrence of a failure in the components in the housing 9.

Example 3

As shown in fig. 6, in the dish washing machine of embodiment 3, the 1 st communication port 41 of the dish washing machine 1 of embodiment 1 is removed from the washing tub 7. In example 3, an excess water treatment unit 350 is used instead of the excess water treatment unit 50 according to example 1.

The surplus water treatment unit 350 has a hood portion 350C and a guide pipe 350A. Cover 350C is a box-shaped body provided on the rear wall of drying duct 67 and covers surplus water discharge port 67D from above, below, left, right, and rear. The right end of the guide pipe 350A communicates with the hood 350C, and the left end of the guide pipe 350A communicates with a box-shaped drain pipe P22 in the drain pipe P2.

When the water level of the washing water supplied into washing tub 7 exceeds upper limit water level G1, excess water treatment unit 350 performs a guide process of moving the excess water to the outside of washing tub 7, that is, the inside of cover portion 350C via excess water discharge port 67D and guiding the excess water to box-shaped drain pipe P22 by guide pipe 350A.

In example 3, the other end 346 of the air introduction passage 40 communicates with the intermediate portion of the guide pipe 350A of the excess water treatment unit 350 through the first communication port 341. The excess water treatment unit 350 communicating with the other end 346 of the air introduction passage 40 is an example of the "communication target" of the present invention.

Although not shown, a valve mechanism such as a float is provided inside the box-shaped drain pipe P22 connected to the left end of the guide pipe 350A, and the valve mechanism closes the left end of the guide pipe 350A by the water pressure of the washing water flowing through the box-shaped drain pipe P22 during draining.

The lowermost end of the 1 st communication port 341 is located above the lowermost end of the surplus water discharge port 67D. When the vacuum interrupter 30 is disposed above the 1 st communication port 341, the lowermost end of the 2 nd communication port 42 is located above the lowermost end of the 1 st communication port 341.

The other structure of embodiment 3 is the same as embodiment 1. Therefore, the same reference numerals are given to the same structures as those of embodiment 1, and the description thereof is omitted or simplified.

In the dishwasher of example 3 configured as described above, even when water flows into the air introduction passage 40 from the valve chamber 39R of the vacuum interrupter 30 through the 2 nd communication port 42, the other end 346 of the air introduction passage 40 communicates with the guide pipe 350A of the excess water treatment unit 350 that is the communication target through the 1 st communication port 341, and therefore, the water that has flowed into the air introduction passage 40 can be guided to the box-shaped drain pipe P22 and separated from the components in the housing 9.

Therefore, in the dish washing machine according to embodiment 3, as in the dish washing machines 1 according to embodiments 1 and 2, even if the waste water flows into the air introduction passage 40 from the vacuum circuit breaker 30, it is possible to suppress occurrence of a failure in the components in the housing 9.

Example 4

As shown in fig. 7, in the dish washing machine of embodiment 4, the 1 st communication port 41 of the dish washing machine 1 of embodiment 1 is removed from the washing tub 7.

In example 4, the other end 446 of the air introduction passage 40 communicates with the tubular drain pipe P24 of the drain pipe P2 through the 1 st communication port 441. The tubular drain pipe P24 communicating with the other end 446 of the air introduction passage 40 is an example of the "communicating object" of the present invention.

Although not shown, a valve mechanism 446V such as a float is provided on the other end 446 side of the air introduction path 40, and the valve mechanism 446V is subjected to the water pressure of the washing water flowing through the tubular drain pipe P24 at the time of drainage to close the other end 446 side of the air introduction path 40.

The lowermost end of the 1 st communication port 441 is located above the lowermost end of the surplus water discharge port 67D. By disposing the vacuum interrupter 30 above the 1 st communication port 441, the lowermost end of the 2 nd communication port 42 is located above the lowermost end of the 1 st communication port 441.

The other structure of embodiment 4 is the same as embodiment 1. Therefore, the same reference numerals are given to the same structures as those of embodiment 1, and the description thereof is omitted or simplified.

In the dishwasher of example 4 configured as described above, even when water flows into the air introduction passage 40 from the valve chamber 39R of the vacuum interrupter 30 through the 2 nd communication port 42, the other end 446 of the air introduction passage 40 communicates with the tubular drain pipe P24 to be communicated through the 1 st communication port 441, and therefore, the water flowing into the air introduction passage 40 can be kept away from the components in the housing 9.

Therefore, in the dish washing machine according to embodiment 4, as in the dish washing machine 1 according to embodiments 1 to 3, even when the waste water flows into the air introduction passage 40 from the vacuum circuit breaker 30, it is possible to suppress occurrence of a failure in the components in the housing 9.

Example 5

As shown in fig. 8, in the dish washing machine according to embodiment 5, a decompression type backflow preventer 530 is used instead of the vacuum circuit breaker 30 according to the dish washing machine 1 according to embodiment 1. The decompression type backflow preventer 530 is an example of the "backflow preventing device" of the present invention.

The other structure of embodiment 5 is the same as embodiment 1. Therefore, the same reference numerals are given to the same structures as those of embodiment 1, and the description thereof is omitted or simplified.

In example 5, the vacuum back-flow preventer 530 is disposed at a position where the vacuum circuit breaker 30 according to example 1 is disposed in an attitude shown in fig. 8.

The internal structure of the decompression type backflow preventer 530 is well known, and thus the description is simplified. The reduced pressure reverse flow preventer 530 has a housing 539. A downstream end of the 1-time water supply pipe P11 is connected to a connection pipe extending upward from the right end of the outer shell 539 and then protruding leftward. An upstream end of the 2-time water supply pipe P12 is connected to a connection pipe projecting leftward from a left end portion of the housing 539. One end 45 of the air introduction passage 40 is connected to a connection pipe projecting downward from a lower portion of the outer shell 539.

Formed within shell 539 are a 1 st compartment 531, a 2 nd compartment 532, and an intermediate compartment 533. The 1 st chamber 531 communicates with a 1 st water supply pipe P11. The 2 nd chamber 532 communicates with a 2 nd water supply pipe P12. Intermediate chamber 533 is disposed between first chamber 531 and second chamber 532.

The intermediate chamber 533 allows the inflow from the 1 st chamber 531 via the 1 st check valve 531V, while restricting the reverse flow to the 1 st chamber 531. The 2 nd chamber 532 allows the inflow from the intermediate chamber 533 through the 2 nd check valve 532V, while restricting the reverse flow to the intermediate chamber 533.

A safety valve 533V is provided in the intermediate chamber 533. The safety valve 533V opens and closes the 2 nd communication port 542 in conjunction with the diaphragm 533D that deforms due to the pressure difference between the 1 st chamber 531 and the intermediate chamber 533. One end 45 of the air introduction passage 40 communicates with the decompression type backflow preventer 530 through the 2 nd communication port 542.

In the reduced pressure backflow preventer 530 configured as described above, the 1 st check valve 531V, the 2 nd check valve 532V, and the safety valve 533V are closed in a state where the water supply solenoid valve 69 is closed and the water supply into the washing tub 7 by the water supply pipe P1 is stopped, thereby preventing backflow from the 2 nd water supply pipe P12 to the 1 st water supply pipe P11.

When the water supply solenoid valve 69 is opened and the water supply through the water supply pipe P1 into the washing tub 7 is started, the pressure of the water supply pipe P11 is increased 1 time to open the 1 st check valve 531V and the 2 nd check valve 532V. As a result, the water flows from the 1 st water supply pipe P11 to the 2 nd water supply pipe P12 through the 1 st chamber 531, the intermediate chamber 533, and the 2 nd chamber 532.

When the water supply solenoid valve 69 is closed and the water supply through the water supply pipe P1 into the washing tub 7 is stopped, the 1 st water supply pipe P11 is at a negative pressure, and the 1 st check valve 531V and the 2 nd water supply pipe P12 are closed. At this time, the safety valve 533V is appropriately opened according to the pressure difference between the 1 st chamber 531 and the intermediate chamber 533. In this way, the reduced-pressure backflow preventer 530 cuts the 1 st water supply pipe P11 when the pressure inside the 1 st water supply pipe P11 becomes negative, and introduces air into the intermediate chamber 533 provided between the 1 st water supply pipe P11 and the 2 nd water supply pipe P12 through the air introduction passage 40.

In the dishwasher of example 5 configured as described above, even when water flows into the air introduction passage 40 from the intermediate chamber 533 of the reduced-pressure backflow preventer 530 through the 2 nd communication port 542, the other end 46 of the air introduction passage 40 communicates with the washing tub 7 to be communicated with through the 1 st communication port 41, and therefore, the water flowing into the air introduction passage 40 can be kept away from the components in the housing 9.

Therefore, in the dish washing machine according to embodiment 5, as in the dish washing machine 1 according to embodiments 1 to 4, even when the toilet water flows from the decompression type backflow preventer 530 into the air introduction passage 40, it is possible to suppress occurrence of a failure in the components in the housing 9.

In this dishwasher, when the pressure inside the 1-time water supply pipe P11 becomes negative, the decompression type backflow preventer 530 cuts off the 1-time water supply pipe P11 and introduces air into the intermediate chamber 533 through the air introduction passage 40. With this configuration, the backflow into the 1 st water supply pipe P11 that has become a negative pressure can be prevented with high reliability.

Example 6

As shown in fig. 9, in the dish washing machine according to embodiment 6, a vacuum circuit breaker 630 is used instead of the vacuum circuit breaker 30 of the dish washing machine 1 according to embodiment 1. The vacuum circuit breaker 630 is an example of the "backflow prevention device" of the present invention.

The vacuum circuit breaker 630 is only the vacuum circuit breaker 30 according to embodiment 1 modified as follows: the 1 st valve body 36A is removed from the movable body 37, and the 1 st valve seat 38A is removed from the housing 39, and the communication port 39A is always opened.

The other structure of embodiment 6 is the same as embodiment 1. Therefore, the same reference numerals are given to the same structures as those of embodiment 1, and the description thereof is omitted or simplified.

In the vacuum circuit breaker 630 configured as described above, the movable body 37 is biased by the compression coil spring 37S and held at the position shown in fig. 9 in a state where the water supply solenoid valve 69 is closed and the water supply into the cleaning tank 7 by the water supply pipe P1 is stopped. Thereby, the 2 nd valve element 36B is separated from the 2 nd valve seat 38B to open the 2 nd communication port 42, and the air is introduced into the 1 st water supply pipe P11 and the 2 nd water supply pipe P12 through the air introduction passage 40. Thus, the vacuum breaker 630 prevents a reverse flow from the 2-time water supply pipe P12 to the 1-time water supply pipe P11.

When the water supply solenoid valve 69 is opened and the water supply into the cleaning tank 7 is started by the water supply pipe P1, the water flows from the 1 st water supply pipe P11 to the 2 nd water supply pipe P12 through the valve chamber 39R. The water pressure at this time causes the movable body 37 to descend from the position shown in fig. 9 against the urging force of the compression coil spring 37S. Thereby, the 2 nd valve 36B is positioned on the 2 nd valve seat 38B to close the 2 nd communication port 42, and the communication between the 2 nd communication port 42 and the air introduction passage 40 is blocked.

When the water supply solenoid valve 69 is closed and the water supply pipe P1 stops supplying water into the washing tub 7, the water supply pipe P11 becomes a negative pressure 1 time, and the movable body 37 is biased by the compression coil spring 37S and returns to the position shown in fig. 9. Thereby, the 2 nd valve element 36B is separated from the 2 nd valve seat 38B to open the 2 nd communication port 42. Thus, the vacuum interrupter 630 introduces air into the 1 st water supply pipe P11 and the 2 nd water supply pipe P12 through the air introduction passage 40 when the pressure in the 1 st water supply pipe P11 becomes negative.

In the dishwasher of example 6 configured as described above, even when water flows into the air introduction passage 40 from the valve chamber 39R of the vacuum interrupter 630 through the 2 nd communication port 42, the other end 46 of the air introduction passage 40 communicates with the wash tank 7 to be communicated through the 1 st communication port 41, and therefore, the water flowing into the air introduction passage 40 can be kept away from the components in the housing 9.

Therefore, in the dish washing machine according to embodiment 6, as in the dish washing machines 1 according to embodiments 1 to 5, even when the waste water flows into the air introduction passage 40 from the vacuum breaker 630, it is possible to suppress occurrence of a failure in the components in the housing 9.

The present invention has been described above with reference to examples 1 to 6, but the present invention is not limited to the above examples 1 to 6, and can be modified and applied as appropriate within the scope not departing from the gist thereof.

In examples 1 to 6, the treating agent was the liquid rinse agent R1, but the present invention is not limited to this configuration. For example, the treatment agent may be a detergent, or may be a powder or tablet other than a liquid.

The present invention also includes a configuration in which the vacuum circuit breaker 30 according to embodiment 1 is modified as follows: a check valve is provided inside the connection pipe connected to the upstream end of the 2 nd water supply pipe P12. In this case, the valve chamber 39R is an intermediate chamber formed between the 1 st water supply pipe and the 2 nd water supply pipe.

The vacuum circuit breaker 30 according to embodiment 1 may be modified to have the following configuration: by removing the compression coil spring 37S from the configuration shown in fig. 4 and arranging it upside down, when water is supplied from the 1-time water supply pipe P11, this water pressure lifts the movable body 37 upward to open the communication port 39A and close the 2 nd communication port 42, and when water is not supplied from the 1-time water supply pipe P11, the communication port 39A is closed by the weight of the movable body 37 and the 2 nd communication port 42 is opened.

The structure of the dish washing machine of the present invention can also be used for a bathtub washing machine or a bathing device with a bathtub washing function, and the like. In this case, for example, a bathtub is provided in a bathroom, a bathroom as a whole, or the like, that is, in a housing. A backflow prevention device is provided in the middle of a water supply pipe connected to a water supply port provided in a bathtub. One end of the air introduction path is communicated with the backflow prevention device. The other end of the air introduction path is communicated with the bathtub, a drain pipe for draining water from the bathtub, or an excess water treatment unit for treating excess water in the bathtub.

The present invention can be used, for example, in a dish washing machine, a dish washing and drying machine, or a kitchen appliance provided with these machines.

Claims (6)

1. A dish washing machine (1) is characterized by comprising:

a housing (9);

a cleaning tank (7) which is provided in the casing (9), can accommodate an object to be cleaned (TW1), and is provided with a water supply port (7S) and an excess water discharge port (67D);

a water supply pipe (P1) connected to the water supply port (7S) and supplying water into the washing tank (7);

a drain pipe (P2) for discharging the washing water, which is the water supplied into the washing tub (7), to the outside of the casing (9);

a surplus water treatment unit (50, 350) which, when the water level of the washing water supplied into the washing tub (7) exceeds an upper limit water level, moves the washing water as surplus water (W1) to the outside of the washing tub (7) through the surplus water discharge port (67D), and performs a storage treatment of storing the surplus water (W1) in a storage section (9P) provided in the casing (9) or a guide treatment of guiding the surplus water (W1) to the drain pipe (P2);

a backflow prevention device (30, 530, 630) provided in the middle of the water supply pipe (P1); and

an air introduction passage (40) having one end (45) of the air introduction passage (40) communicating with the backflow prevention device (30, 530, 630),

the water supply pipe (P1) is divided into 1 water supply pipe (P11) on the upstream side of the backflow prevention device (30, 530, 630),

the water supply pipe (P1) is divided into 2 water supply pipes (P12) on the downstream side of the backflow prevention device (30, 530, 630),

the backflow prevention device (30, 530, 630) is configured to: preventing a reverse flow from the 2-time water supply pipe (P12) to the 1-time water supply pipe (P11), and introducing air into the water supply pipe (P11) through the air introduction passage (40) when the pressure in the 1-time water supply pipe (P11) becomes negative: the 2-time water supply pipe (P12), an intermediate chamber (533) provided between the 1-time water supply pipe (P11) and the 2-time water supply pipe (P12), or the 1-time water supply pipe (P11) and the 2-time water supply pipe (P12),

the other end (46, 246, 346, 446) of the air introduction path (40) communicates with the cleaning tank (7), the drain pipe (P2), or the excess water treatment unit (50, 350).

2. Dishwasher (1) according to claim 1,

the backflow prevention device (30, 530, 630) shuts off the 1 st water supply pipe (P11) when the pressure inside the 1 st water supply pipe (P11) becomes negative, and introduces air into the 2 nd water supply pipe (P12) or the intermediate chamber (533) through the air introduction passage (40).

3. Dishwasher (1) according to claim 1 or 2,

the dishwasher (1) further comprises a treatment agent supply device (20), wherein the treatment agent supply device (20) is arranged in the middle of the 2-time water supply pipe (P12), and the treatment agent (R1) is mixed into the water supplied into the washing tank (7) to supply the treatment agent (R1) into the washing tank (7).

4. Dishwasher (1) according to one of claims 1 to 3,

the other end (46, 246, 346, 446) of the air introduction passage (40) communicates with the object of communication (7, P2, 50, 350) through a 1 st communication port (41, 241, 341, 441),

the lowermost end of the 1 st communication port (41, 241, 341, 441) is positioned above the lowermost end of the excess water discharge port (67D).

5. Dishwasher (1) according to one of claims 1 to 4,

the one end (45) of the air introduction path (40) is communicated with the backflow prevention device (30, 530, 630) through a 2 nd communication port (42, 542),

the lowermost end of the 2 nd communication port (42, 542) is positioned above the lowermost end of the excess water discharge port (67D).

6. Dishwasher (1) according to one of claims 1 to 5,

the front of the shell (9) is open,

the dish washing machine (1) further comprises a movable body (6), the movable body (6) being movable between a storage position where the movable body is stored in the housing (9) and a pull-out position where the movable body is moved forward from the storage position,

the cleaning tank (7) is arranged on the moving body (6) and is provided with an opening (7H) with an upper part opened,

the backflow prevention device (30, 530, 630) is provided on the movable body (6) at a position further to the rear than a rear wall (7B) of the cleaning tank (7).

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