JPH0246817A - Heat exchanger for washing machine - Google Patents

Abstract

PURPOSE:To improve thermal efficiency by feeding washing hot water into a circulating chamber provided in contact with the outer periphery of the body barrel of a heat exchanger and recovering heat which escapes from the outer periphery of the body barrel. CONSTITUTION:Hot water in a hot water tank 1 flows into a circulation chamber 24 provided in contact with the outer periphery of the body barrel 12 of a heat exchanging portion A through a connecting pipe 22 on the downside and, after being heating by heat escaping from the body barrel 12, it is returned to the hot water tank 1 via a connecting pipe 23 on the upside. The washing hot water which is thus kept at a constant temperature is pumped up by a pump 21, injected out of installing pipes 2 to carry out a washing process, and again stored in the hot water tank 1. Then, fresh water which is sent in by means of a pump 16 undergoes heat transmission to become a high temperature water in the fresh water chamber 13 of the heat exchanging portion A and injected out of nozzle installing pipes 3 via a connecting pipe 17 to carry out the rinsing finish of washing. Air which is sent in by means of a blower 19 is sent into a heat exchanger 25 and an air heater 18 to become a high temperature air and injected out of injecting bodies 4 through a pipe 32 to carry out drying.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to the structure of a heat exchanger that supplies hot water or the like to a washing machine that washes tableware or the like.

(Prior Art) Various types of washing machines have been proposed that spray hot water onto objects to be washed, such as tableware. For example, Utsukai 56-
This is a conventional technique disclosed in Japanese Utility Model Publication No. 125157, Japanese Utility Model Publication No. 6091166, Japanese Utility Model Publication No. 57-40907, and the like.

These typical conventional dishwashers, for example, spray hot water onto dishes to wash them, and spray high-temperature air onto the washed dishes to finish drying them. In order to produce hot water and high-temperature air for cleaning, a heater and a combustor that burns gas or the like are used. It is more efficient to use a combustor to wash a large amount of dishes. This combustor also functions as a heat exchanger that exchanges heat between the flame and combustion gas produced by combustion and fresh water such as tap water or outside air to produce hot water or high-temperature air.

Such a heat exchanger is based on conventional technology (for example, the
(disclosed in Japanese Utility Model Publication No. 0-91166 and Japanese Utility Model Publication No. 57-40907), it is installed outside the washer, and some kind of heat medium (such as high-temperature water, etc.) is installed between the heat exchanger and the combustor. It is connected with a pipe that passes through it.

(Problem to be Solved by the Invention) However, the above-mentioned heat exchanger that also serves as a combustor is installed outside the washing machine, and the outer peripheral wall of the combustor is in contact with the outside air, so heat escapes from this outer peripheral wall. Thermal efficiency was low.

This invention was made in view of the above problems, and an object thereof is to obtain a heat exchanger for a washing machine that can improve thermal efficiency.

(Means for Solving the Problems) In this invention, a reflux chamber is provided in contact with the outer periphery of the main body shell corresponding to the combustor, through which warm water for cleaning is passed, so that heat escaping from the outer periphery of the main body shell can be recovered.

That is, the present invention provides a heat exchanger for supplying hot water for washing, high temperature water for rinsing, and high temperature air for drying necessary for the washing process, rinsing process, and drying process of a washing machine. a main body shell through which the burned flame and combustion gas pass; a water channel provided within the main body shell through which fresh water passes; an air passage provided within the main body shell through which air passes; It is characterized by being equipped with a circulation chamber through which hot water is passed.

(Function) By passing hot water for cleaning through the reflux chamber provided in contact with the outer periphery of the main body, the heat that conventionally escaped from the outer periphery of the main body can be recovered as heat for keeping and heating the hot water.

Therefore, thermal efficiency can be improved.

(Example) An example of a heat exchanger for a washing machine according to the present invention will be described with reference to FIG. There is a hot water tank 1 on the side of the washing machine body for storing hot water for washing containing detergent and the like.

A chain conveyor, a crank link, or the like, which is a conveying means (not shown), is provided on the top surface of the hot water tank 1. Objects to be cleaned, such as tableware, are conveyed on this conveying means and into the inside of the washing machine main body.

Along with this conveyance, washing processes such as a washing process, a rinsing process, and a final drying process are performed.6 However, it is also possible to perform these processes continuously at one location without being conveyed by a conveying means.

The cleaning process is performed using hot water for cleaning that is jetted from the nozzle of the first nozzle attachment pipe 2 . The hot water -m contains a detergent, but the detergent does not necessarily have to be included, and generally the object to be cleaned is conveyed on the conveying means while being held in a rack for cleaning. The rack and the object to be cleaned will pass through the washing process at the same time. The rinsing step is performed by spraying clean high-temperature water onto the cleaned object from the nozzle of the second nozzle attachment pipe 3. The finishing drying process is performed by injecting high temperature air from the injection holes of the box-shaped high temperature air injection unit 4 onto the rinsed object. After completing these steps, the object to be cleaned is carried out of the washing machine by a conveyance means. However, as mentioned above, it is also possible to complete all the washing steps in one place.

Note that the first and second nozzle attachment pipes 2.3 are attached to nozzle headers 5, 6, respectively.

The above washing process is performed in the main body of the washing machine. On the outside of this washing machine body, there is hot water used in the washing process,
A heat exchanger 7 that also serves as a combustor for supplying high-temperature water and high-temperature air is provided. A combustion chamber 8 is formed at the bottom of the heat exchanger 7, and a burner 9 is provided inside the combustion chamber 8.
is installed facing upwards. A fuel stop valve 11 that can be electrically opened and closed is provided in the middle of a fuel pipe 10 that sends fuel to the burner 9. The flame and combustion gas generated by combustion in the burner 9 pass through the main body shell 12 and rise. A fresh water chamber 13, which is a waterway through which fresh water passes, is formed inside the main body 12. Inside this fresh water chamber 13, a plurality of pipes 14 are passed in the vertical direction to pass exhaust heat gas and flame, and constitute a heat exchange section A. Fresh water is supplied to the fresh water chamber 13 via a water supply pipe 15 and a water supply pump 16 through which fresh water passes. The high-temperature water supplied and heated in the heat exchange section A is guided through a high-temperature water communication pipe 17 to a nozzle attachment pipe 3 that injects the high-temperature water.

Inside the main body shell 12 and above the heat exchange section A, an air heater 18 made of a winding pipe is provided as an air path for passing air. Air is fed into this air heater 18 via an air blower 19, and the hot air produced here is directed to the hot air jets 4. Note that a part of the air sent from the air blower 19 is sent to the burner 9.

Hot water in the hot water tank 1 is pumped up by a cleaning pump 21 and guided to a nozzle attachment pipe 2 for spraying the hot water. Two communication pipes 22 and 23 are provided on one wall of the hot water tank 1 and communicate with a reflux chamber 24 provided in contact with the outer periphery of the main body shell 12 of the heat exchange section A. As a result, hot water flows back into the circulation chamber 24. In other words, the hot water in the hot water tank flows into the circulation chamber 24 through the lower communication pipe 22, absorbs the heat that conventionally escaped from the outer periphery of the main body 12, is heated, and passes through the upper communication pipe 23 into the hot water tank. Return to 1. As a result, the hot water in the hot water tank 1 is heated or kept at a constant temperature.

Note that an air drain heat exchanger 25 is provided in the air pipe between the air blower 19 and the air heater 18.

This air train heat exchanger 25 is connected to the lower communication pipe 22.
It consists of a plurality of pipes 27 through which hot water led from the drain pipe 26 passes, and a sealed pipe 28 that houses the plurality of pipes. The air blower 1
The air sent by 9 passes therethrough, is preheated by exchanging heat with hot water, and is led to the air heater 18 . The hot water that has passed through the plurality of pipes 27 is discharged through a drain vent pipe 33. This train discharge vent pipe 33 has the function of keeping the water level in the hot water tank 1 constant. Note that the fuel supplied to the burner 9 can be either a gas such as city gas or a liquid such as kerosene. Furthermore, the hot water tank 1 has a receiving part 29, which receives hot water or high-temperature water after washing or rinsing, stores it, and uses it again as hot water for washing. Further, the amount of air sent from the air blower 19 is adjusted by a damper 30.

Next, the operation of this embodiment will be explained.

In the burner 9, the fuel sent through the fuel pipe 10 and the air sent through the air pipe 31 are mixed and injected into the combustion chamber 8 for combustion. This combustion simultaneously heats and retains the hot water for cleaning, heats the clean water, and further heats the air.

That is, the hot water in the hot water tank 1 flows into the reflux chamber 24 through the lower communication pipe 22 and is heated, and then is returned into the hot water tank 1 through the upper communication pipe 23. The hot water for cleaning kept at a constant temperature in this way is supplied to the cleaning pump 2.
The hot water pumped up by No. 1 and jetted out from No. 1 nozzle attachment pipe 2 to perform the cleaning process is stored in the hot water tank 1 again.

Fresh water for the rinsing process is then pumped through the water supply pipe 15 by the water supply pump 16. Note that the water supply pump 16 can be omitted by using ordinary tap water as fresh water. In the fresh water chamber 13 of the heat exchange section A, the fresh water sent in receives heat transfer by radiant heat or conductive heat from the flame or combustion gas, and becomes high-temperature water. This high-temperature water is injected from the second nozzle attachment pipe 3 via the high-temperature water communication pipe 17 to clean and rinse the entire object to be cleaned.

The air sent by the air blower 19 is preheated by hot water for cleaning in the air drain heat exchanger 25, and then sent to the air heater 18. In this air heater 18, the air exchanges heat with the combustion gas and becomes high-temperature air. The hot air passes through the hot air pipe 32 and is injected from the box-shaped hot air jet 4 to dry the wet object to be cleaned after washing and rinsing. The position of the hole is such that the spray can be sprayed directly onto the object to be cleaned or in a spiral pattern, so that drying can be performed quickly.

The hot water or high-temperature water used in the cleaning process or the rinsing process as described above flows into the hot water tank 1 and is used again as hot water for cleaning. During repeated use, the temperature of the hot water for cleaning becomes low.The reason why the temperature decreases is because the temperature of the object to be cleaned rises, the heated object is taken out, and the hot water tank 1 This is because heat is radiated from the upper surface or peripheral wall, resulting in a loss of thermal energy. In order to compensate for this loss, as described above, by flowing hot water for cleaning into the reflux chamber 24 provided on the outer periphery of the main body shell 12 of the heat exchanger and causing it to circulate, the heat that conventionally escaped from the outer periphery of the main body shell 12 is used for cleaning. It becomes possible to effectively use hot water to keep it warm.

In this way, the heat exchanger of the washer in this embodiment is a triple heat exchanger that can supply hot water, high-temperature water, and high-temperature air to the washer using one combustor, and hot water would normally be wasted away. This makes effective use of the heat that was previously generated.

(Other Embodiments) In the above embodiments, the fresh water chamber 13 is provided in the main body body 12 as a channel for passing fresh water, and the air heater 18 is provided as an air channel for passing air. In the example, as shown in Fig. 2, a fresh water heater 41 which is a winding pipe is provided as a waterway for passing fresh water, and a double coiled air is provided as an air passageway for passing air. It is also possible to provide a heater 42 and to place the double coil air heater 42 below the fresh water heater 41, ie near the burner 9.

That is, as shown in FIG. 2, the air sent by the air blower 19 passes through the double coil air heater 42 and becomes high temperature air. At this time, the double coil air heater 4
2 is located near the burner 9 and can supply a large amount of higher temperature air.

Further, the fresh water sent by the water supply pump 16 passes through a pipe-shaped fresh water heater 41 and becomes high-temperature water. At this time, the fresh water is preliminarily heated by hot water for cleaning drawn from the hot water tank 1. Note that the air pipe through which the air sent by the air blower 19 passes is branched into two directions, one going to the double coil air heater 42 and the other going to the burner 9, and dampers are installed in each of the two branched pipes. 3
0 is set.

(Effects of the Invention) As described above, according to the heat exchanger for a washing machine of the present invention,
A reflux chamber is installed around the outer periphery of the main body of the heat exchanger to pass hot water for washing, and the heat that conventionally escaped from the outer periphery of the main body can be used to keep the hot water warm, creating a heat exchanger for washing machines with high thermal efficiency. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic view showing one embodiment of a heat exchanger for a washing machine according to the present invention, and FIG. 2 is an enlarged view of main parts showing a second embodiment of the present invention. l... Hot water tank, 2... First nozzle attachment pipe, 3
... second nozzle attachment pipe, 4 ... high temperature air injection body,
56... Nozzle header, 9... Burner, 12... Body trunk, 13... Fresh water chamber (water channel), 18... Air heater (air path), 24... Circulation chamber.

Claims (1)

[Claims] In a heat exchanger for supplying hot water for washing, hot water for rinsing, and hot air for drying necessary for the washing process, rinsing process, and drying process of a washing machine, there is a burner and a flame and combustion gas generated by the burner. a main body shell through which fresh water passes, a water channel provided within the main body shell to allow fresh water to pass through, an air passage provided within the main body shell to allow air to pass through, and a reflux chamber provided in contact with the outer periphery of the main body shell to allow the hot water for cleaning to pass through. A heat exchanger for a washing machine, characterized by comprising: