JPH0574461U - Dishwasher - Google Patents

Abstract

(57) [Summary] [Purpose] In a dishwasher, keep the rinse water system clean by preventing detergent from mixing into the rinse water system at the end of the rinse process. [Structure] A pump 19 and a check valve 20 are provided in a pipe 21 that connects the rinse water nozzles 4 and 5 and the hot water storage tank 7 arranged above and below a washing chamber 1 of a dishwasher, and a check valve 2
On the upstream side of 0, a cleanser tube 22 that branches from the pipe 21 and communicates with the wash water tank 6 is provided with a mixer 23 for sucking up the liquid detergent from the liquid detergent tank 8 and a bent portion 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanism for preventing a liquid detergent from being mixed into a rinse water system in a dishwasher after completion of a rinse process.

[0002]

[Prior Art]

 In the conventional dishwasher, as shown in FIG. 3, the washing water nozzles 2 and 3 and the rinsing water nozzles 4 and 5 are arranged above and below the washing chamber 1, and at the bottom of the washing chamber 1. A water tank 6 is installed, and a hot water storage tank 7 and a liquid detergent tank 8 are provided below the cleaning chamber 1.

The wash water tank 6 is provided with filters 9, 10 and an overflow pipe 11, and a wash water pipe 13 communicating with the wash water nozzles 2 and 3 with a wash water pump 12 and a drain valve 14. The drainage pipe 15 is connected, and the hot water storage tank 7 is provided with a water supply pipe 16, an overflow pipe 17, and a drain pipe 18, and a rinse water nozzle 4, a rinse water pump 4, and a check valve 20. A rinsing water pipe 21 leading to 5 is connected.

Further, a mixer 23 is installed in a cleanser tube 22 that branches from a pipe 21 and communicates with the wash water tank 6 on the upstream side of the check valve 20, and connects the liquid detergent tank 8 and the mixer 23 below. The hose 24 to be connected is provided with a filter 25 and a liquid detergent metering device 26 as described in Japanese Utility Model Laid-Open No. 2-116266.

Wash water having an appropriate detergent concentration is stored in the wash water tank 6, and the wash water is fed from the wash water tank 6 to the wash water nozzles 2 and 3 through the pipe 13 by driving the wash water pump 12. The cleaning water is sprayed from the cleaning water nozzles 2 and 3 to clean the not-shown food in the cleaning chamber 1, and then the cleaning water tank 6 is returned. After the cleaning process by this circulation is completed, as shown by the arrow in the figure, By driving the rinse water pump 19, the rinse water in the hot water storage tank 7 is sent to the rinse water nozzles 4 and 5 through the pipe 21 and is sprayed from the rinse water nozzles 4 and 5 to rinse the dishes, while the pipes are rinsed. The flow of water branched from 21 and fed to the cleanser tube 22 creates a negative pressure in a venturi portion (not shown) in the mixer 23, and a certain amount of liquid detergent is sucked up through the metering device 26. As a result, a mixed fluid of water and liquid detergent flows into the wash water tank 6, and the detergent concentration of the wash water in the wash water tank 6 is maintained at an appropriate value.

However, when the rinsing water pump 19 is stopped at the end of the rinsing stroke, the rinsing water in the pipe 21 starts to flow backward so that the rinsing water has the same water level as in the lower hot water storage tank 7, and the check valve 20 is immediately closed. Therefore, the water in the cleanser tube 22 and the mixed fluid in the mixer 23 are sucked into the pipe 21 side having a large capacity.

As a result, the detergent component in the mixed fluid may mix into the pipe 21 and even reach the hot water storage tank 7, and the rinse water in the hot water storage tank 7 and the pipe 21 contains the detergent component. If so, the rinse water used in the subsequent rinsing process will contain detergent and the rinse effect on the dishes will be incomplete. However, if this liquid detergent or the solid detergent contained in it is mixed into the pipe 21 or the like and adheres to the wall surface, the wall surface may be corroded depending on the material. There was a risk of water leakage.

[0008]

[Problems to be solved by the device]

 The present invention seeks to prevent liquid detergent from entering the rinsing water system of the rinsing water pipe and rinsing water tank at the end of the rinsing process in the dishwasher.

[0009]

[Means for Solving the Problems]

 In order to achieve this object, the dishwasher according to the present invention comprises a washing room, a rinse water nozzle arranged in the washing room, a washing water tank installed at the bottom of the washing room, a rinsing water tank and the rinsing water. A pipe that connects the water tank and the rinse water nozzle, a pump and a check valve that are sequentially installed on the pipe from the rinse water tank side, and the pipe is branched from the pipe between the pump and the check valve to wash water. There is a passage communicating with the tank and a mixer provided at a position higher than the water level in the rinsing water tank in the passage, to which the liquid detergent is fed, and backflow to the passage between the pipe and the mixer. A suppression mechanism is formed.

Also, the dishwasher according to the present invention comprises a washing room, a rinsing water nozzle arranged in the washing room, a rinsing water tank installed at the bottom of the rinsing room, a rinsing water tank, and the rinsing water tank. And the rinse water nozzle, a pipe and a check valve that are sequentially installed on the pipe from the rinse water tank side, and a branch from the pipe between the pump and the check valve to branch from the wash water tank. And a mixer which is provided at a position higher than the water level in the rinsing water tank in the rinsing water tank and in which the liquid detergent is fed, and the rinsing water is provided between the pipe and the mixer. It has a bent part that hangs to a position lower than the water level in the tank.

Further, the dishwasher according to the present invention comprises a washing room, a rinsing water nozzle arranged in the rinsing room, a rinsing water tank installed at the bottom of the rinsing room, a rinsing water tank, and the rinsing water tank. And a pipe connecting the rinse water nozzle, a pump and a check valve that are sequentially installed on the pipe from the rinse water tank side, and a branch between the pump and the check valve to branch from the pipe to perform the cleaning. A passage communicating with the water tank and a mixer provided at a position higher than the water level in the rinsing water tank in the passage to feed the liquid detergent, and the passage between the pipe and the mixer. A sealed box body is provided, and the opening on the pipe side of the box body is arranged higher than the opening on the mixer side.

[0012]

[Action]

 That is, when the rinse water pump is stopped and the check valve is closed at the end of the rinse stroke, the rinse water in the pipe upstream of the check valve flows backward and tries to suck the water in the passage into the pipe. However, the backflow suppression mechanism formed in the passage suppresses the backflow of the water in the passage and the mixed fluid of the water and the liquid detergent existing in the mixer into the pipe. It is easily prevented from flowing into.

Similarly, at the end of the rinsing stroke, the rinsing water in the pipe flows backward and tries to suck the water in the passage into the pipe, but the passage hangs down to a position lower than the water level in the rinsing water tank. Since it has a bend leading to the mixer at a position higher than the same water level, if the water level on the mixer side of this bend falls to the water level in the rinse water tank, further backflow will stop. The mixed fluid of water and liquid detergent existing in the mixer stays in the bent portion of the passage and does not reach the pipe or the rinse water tank.

Further, at the end of the rinsing process, the rinsing water in the pipe flows backward and tries to suck the water in the passage into the pipe, but air is easily introduced into the box from the washing water tank side through the low opening, Since these air can be sucked into the pipe side from the high opening of the box and lower the water level in the pipe, there will be no water flowing out from the box to the pipe side, or even if there is only a small amount, Even if the mixed fluid of water and liquid detergent existing in the mixer flows into the box, it stays there and does not reach the pipe or rinse water tank.

[0015]

【Example】

 Hereinafter, an embodiment of the present invention will be described by giving the same reference numerals to the same parts as those of the conventional device. In FIG. 1, rinsing water nozzles 4 and 5 are arranged above and below the washing chamber 1, a washing water tank 6 is installed at the bottom of the washing chamber 1, and a hot water tank 7 and a liquid tank are provided below the washing chamber 1. A detergent tank 8 is provided, a rinse water pipe 21 communicating with the rinse water nozzles 4 and 5 is connected to the hot water storage tank 7, and the pipe 21 is provided with a rinse water pump 19 and a check valve 20.

Further, the cleanser tube 22 that branches from the pipe 21 on the upstream side of the check valve 20 and communicates with the wash water tank 6 once hangs down to a position lower than the water level in the hot water storage tank 7 and then from the same water level. In addition to having a bent portion 30 that rises to a high position, a mixer 23 is installed closer to the wash water tank 6 than the bent portion 30 and a hose 24 that connects the liquid detergent tank 8 and the mixer 23 has a filter. 25 and a liquid detergent metering device 26 are provided, and the other parts have the same structure as the conventional device.

Therefore, the washing process and the rinsing process of the dishes in the washing room 1 are performed in the same manner as in the conventional device described above, but when the rinsing water pump 19 is stopped at the end of the rinsing process, the rinsing water in the pipe 21 is moved downward. In order to start the reverse flow so that the water level becomes the same as that in the hot water storage tank 7, the check valve 20 is closed and the water in the cleanser tube 22 and the mixed fluid of the water in the mixer 23 and the liquid detergent are pipe 21. Trying to be sucked to the side.

However, in the bent portion 30 of the cleanser tube 22, when the water level on the mixer 23 side becomes equal to the water level in the hot water storage tank 7 as shown in the figure, further backflow is stopped, so that the mixing is stopped. The mixed fluid existing in the vessel 23 remains in the bent portion 30 and does not reach the pipe 21 or the hot water storage tank 7. For this reason, the detergent components in the mixed fluid are reliably prevented from mixing into the pipe 21 and the hot water storage tank 7, and a complete rinse treatment can be performed by always supplying clean rinse water in the rinse step. At the same time, there is no possibility that the liquid detergent or the solid detergent contained therein will adhere to the wall surface of the pipe 21 or the like and cause corrosion.

In the embodiment shown in FIG. 2, a box 40 sealed by the cleanser tube 22 between the rinse water pipe 21 and the mixer 23 is provided, and the volume of the box 40 is The total volume of passages between the mixer 23 and the cleanser tube 22 from the box body 40 to the wash water tank 6 is sufficiently large, and the opening 41 on the pipe 21 side relative to the box body 40 has a box shape. The opening 42 on the mixer 23 side is provided near the top of the body 40, and is provided near the bottom of the box 40, and other configurations are not particularly different from those of the above-described embodiment.

Therefore, the washing process and the rinsing process of the dishes in the washing room 1 are performed in the same manner as the conventional device, but at the end of the rinsing process, the rinsing water pump 19 is stopped and the rinsing water in the pipe 21 is moved downward. The reverse flow is started so that the water level becomes the same as that in the hot water storage tank 7, the check valve 20 is closed, and the water in the cleanser tube 22 tends to be sucked into the pipe 21 side.

At this time, since air remains in the upper portion of the box body 40, this air flows into the cleanser tube 22 through the upper opening 41, and the water in the box body 40 becomes cleanser tube 22. Even if it does not backflow into the inside, or if it flows back, it is a small amount, and even if the mixed fluid of water and liquid detergent existing in the mixer 23 flows down into the wash water tank 6 or flows back into the box 40. At the same time, air is sucked in from the flush water tank 6 side, and only air then flows into the pipe 21 through the cleanser tube 22 from the opening 41 of the box body 40, and the water level in the pipe 21 is the hot water storage tank as shown in the figure. The water and the mixed fluid do not flow backward from the box body 40 into the pipe 21 until the water level matches the water level of 7. The detergent component in the mixed fluid flowing into the box 40 is discharged to the wash water tank 6 through the mixer 23 by the water introduced in the next rinsing stroke.

Therefore, as in the case of the above-described embodiment, the detergent components in the mixed fluid are reliably prevented from mixing into the pipe 21 and the hot water storage tank 7, and the rinse water is always clean during the rinsing process. It is possible to perform a complete rinsing treatment by supplying the liquid, and to prevent the liquid detergent and the solid detergent therein from adhering to the wall surface of the pipe 21 or the like and causing corrosion.

The mixer in each of the above embodiments is designed to suck up the liquid detergent by the Venturi effect of the water flow, but the present invention is not necessarily limited to such a configuration, and an appropriate amount of the liquid detergent can be obtained. It goes without saying that the present invention is equally applicable to those which are sent to the mixer and mixed with the diverted water from the rinse water pipe.

Further, a normally open ventilation valve is provided on the wall surface of the passage between the rinse water pipe and the mixer, and the ventilation valve is closed in synchronization with the operation of the rinse water pump. During operation, the ventilation valve closes and the liquid detergent is sucked up by the mixer to flow into the wash water tank as before, while at the end of the rinsing process, the ventilation valve opens and the above passage communicates with the atmosphere. It can also be configured so as to prevent the mixed fluid in the mixer from flowing back to the rinse water pipe side.

[0025]

[Effect of the device]

 In the dishwasher according to the present invention, at the end of the rinsing stroke, the rinsing water in the pipe upstream of the check valve tries to flow backward, but the rinsing water in the passage branched from the pipe and communicating with the above-mentioned washing water tank The water and the mixed fluid of water and the liquid detergent existing in the mixer are prevented from flowing back to the pipe, and the mixed fluid is prevented from flowing into the pipe and rinse water tank. Detergent components will not mix into the pipe and rinse water tank, and therefore, it is possible to perform a complete rinse treatment by supplying clean rinse water at all times during the rinse process, and to clean the wall surface of the pipe etc. There is no risk of corrosion caused by the detergent or the solid detergent contained therein, and good maintenance of the dishwasher can be ensured.

[Brief description of drawings]

FIG. 1 is a schematic layout view of essential parts in an embodiment of the present invention.

FIG. 2 is a schematic layout view of essential parts in another embodiment of the present invention.

FIG. 3 is a schematic layout diagram of a conventional device.

[Explanation of symbols]

 1 Washing Room 4 Rinsing Water Nozzle 5 Rinsing Water Nozzle 6 Rinsing Water Tank 7 Hot Water Storage Tank 8 Liquid Detergent Tank 19 Rinsing Water Pump 20 Check Valve 21 Rinsing Water Pipe 22 Cleanser Tube 23 Mixer 30 Bending Section 40 Box 41 Opening 42 Opening

Claims (3)

[Scope of utility model registration request] 1. A washing chamber, a rinsing water nozzle arranged in the washing chamber, a rinsing water tank installed at the bottom of the rinsing chamber, a rinsing water tank, and a pipe connecting the rinsing water tank and the rinsing water nozzle. , A pump and a check valve sequentially installed in the pipe from the rinse water tank side, a passage branched from the pipe between the pump and the check valve and communicating with the wash water tank, and the rinse water in the passage. A dishwasher having a mixer provided at a position higher than a water level in a tank, for feeding a liquid detergent, and having a backflow suppressing mechanism formed in the passage between the pipe and the mixer. 2. A cleaning chamber, a rinse water nozzle arranged in the cleaning chamber, a cleaning water tank installed at the bottom of the cleaning chamber, a rinse water tank, and a pipe connecting the rinse water tank and the rinse water nozzle. , A pump and a check valve sequentially installed in the pipe from the rinse water tank side, a passage branched from the pipe between the pump and the check valve and communicating with the wash water tank, and the rinse water in the passage. A mixer provided at a position higher than the water level in the tank to deliver the liquid detergent, and the passage is bent between the pipe and the mixer to a position lower than the water level in the rinse water tank. Dishwasher with parts. 3. A cleaning chamber, a rinse water nozzle arranged in the cleaning chamber, a cleaning water tank installed at the bottom of the cleaning chamber, a rinse water tank, and a pipe connecting the rinse water tank and the rinse water nozzle. , A pump and a check valve sequentially installed in the pipe from the rinse water tank side, a passage branched from the pipe between the pump and the check valve and communicating with the wash water tank, and the rinse water in the passage. A mixer provided at a position higher than the water level in the tank for feeding the liquid detergent, and a box body sealed in the passage between the pipe and the mixer is provided for the box body. A dishwasher in which the opening on the pipe side is higher than the opening on the mixer side.