JPH07332A - Hot water supply mechanism in dishwasher - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the installation space for large-scale dishwashers for commercial use, improve the kitchen environment, automate operations, and increase the types of dishes that can be applied to washing. [Structure] A washing machine main body 101 in which a washing hot water tank 107 and a rinsing hot water tank 108 are housed in a storage room 103 below a dish washing room 102 provided with a washing nozzle 104 and a rinsing nozzle 105, and high-temperature rinsing hot water The water heater 121 is capable of supplying hot water, and the hot water supply side and the water supply side of the water heater 121 pass through the hot and cold water constant temperature mixing valve 122 to the washing hot water tank 107 and the rinse hot water tank 108 respectively. The hot water supply paths 138 and 139 of
This is a hot water supply mechanism in a dishwasher in which opening / closing valves 140 and 141 are provided in the first and second hot water supply paths 138 and 139, respectively, and a drive mechanism for changing the set temperature is installed in the hot and cold water constant temperature mixing valve 122.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher, and more particularly to a hot water supply mechanism in a large-scale dishwasher for business use.

[0002]

2. Description of the Related Art A dishwasher sprays hot water from a washing nozzle onto the dishes stored in a dishwashing chamber using a rack or the like, and then sprays hot water from a rinsing nozzle. This is a configuration for rinsing. At this time, the temperature of the washing water is set to about 60 to 65 ° C without being too high in order to prevent deterioration of the detergency for proteins, but the temperature of the rinsing water is set to 80 to 85 ° C for sterilization and drying by residual heat. The high temperature is about ℃. In addition, as the wash water, the water stored in the wash water tank is circulated and used, and as the rinse water, the hot water in the rinse water tank that stores high-temperature hot water is used only once, and is discarded through the wash water tank. Therefore, dishwashers require hot water of at least two different temperatures.

In a conventional dishwasher, especially a large-scale dishwasher for business use, a washing water tank is stored together with equipment such as a pump in a storage room provided below the dishwashing room, and a kitchen is provided here for general hot water supply. It is configured to supply hot water from the water heater installed in. Since the hot water of this water heater for ordinary hot water is low in temperature as it is to be used as rinse water, the rinse water tank is stored in a separate booster, and the water supplied from the water heater is supplied by a gas burner or the like. The temperature is raised and supplied to the rinsing nozzle. Therefore, the conventional dishwasher has a washing machine body, a booster,
It consists of a water heater for general hot water supply.

FIGS. 4 and 5 show a conventional example of such a dishwasher. Reference numeral 1 is a washing machine main body, 2 is a booster,
3 is a water heater installed for general hot water supply. The washing machine body 1 is composed of an upper dish washing chamber 4 and a lower storage chamber 5, and the dish washing chamber 4 is provided with a washing nozzle 6 and a rinsing nozzle 7 at the upper and lower positions, respectively. There is. Further, the storage room 5 is provided with a washing hot water tank 8 having an open upper part so as to receive hot water falling from the dish washing room 4, and an electric heater 9 and an overflow pipe 10 are provided in the washing hot water tank 8. It is provided. Then, the washing hot water tank 8 and the washing nozzle 6 are connected by a pipe, and the washing pump 1 is put in place.
1 is installed. In addition, a rinsing pump 12 is installed in the storage chamber 5, the discharge side of the rinsing pump 12 is connected to the rinsing nozzle 7 via a pipe, and the rinsing provided on the booster 2 via a pipe on the suction side. It is connected to the bath 13. The rinsing and detergent supply devices 14, 15 are joined to the discharge side pipe of the rinsing pump 12,
The detergent supply device 14 is connected to the wash water tank 8 via a pipe. The rinse and detergent supply devices 14 and 15 are connected to the rinse container 16 and the detergent container 17, respectively, through pipes.

On the other hand, the booster 2 is provided with a burner 18 for raising the temperature of the hot water in the rinsing hot water tank 13 and the rinsing hot water tank 1
A ball tap 19 is provided at the hot water inlet of 3, and the ball tap 19 is connected to a pipe at the hot water outlet of the water heater 3 via a first valve 20. Further, the downstream side of the first valve 20 and the cleaning hot water tank 8 are connected by a pipe via a second valve 21. Further, the rinsing hot water tank 13 is provided with a hot water temperature adjusting device having a hot water temperature sensor 23, and the burner 18 is automatically turned on when the hot water temperature falls below a predetermined temperature. Reference numeral 22 is an exhaust stack.

The driving operation in the above-mentioned structure will be described below. First, at the start of operation, after igniting the water heater 3,
By opening the valve 20, normal temperature of the water heater 3, for example, 40 to 60 ° C. hot water is supplied to the rinsing hot water tank 13 via the ball tap 19 to store a predetermined amount. Next, by opening the second valve 21, the hot water of the water heater 3 is supplied to the washing water tank 8, and when a predetermined amount is accumulated, the second valve 21 is closed. Then, by turning on the operation switch, the burner 1 of the booster 2
8 is ignited and the hot water in the rinse bath 13 is heated to a predetermined temperature, for example,
While the operation of raising the temperature to about 80 to 85 ° C. is started, the hot water in the washing hot water tank 8 is set to a predetermined temperature, for example, by the hot water temperature adjusting device.
The operation of maintaining or raising the temperature to about 60 to 65 ° C starts, and the initial operation at the start of operation is completed. In this initial operation, an appropriate amount of detergent is manually supplied into the washing water tank 8.

When the initial operation is completed in this way, the door of the dishwashing room 4 is opened, the rack on which the dishes are mounted is installed at a predetermined position, and when the door is closed, the washing pump 11 is turned off.
It becomes N and the cleaning operation starts. When the washing operation is started, the hot water in the washing hot water tank 8 is pressurized by the washing pump 11 and ejected from the washing nozzle 6, removes dirt on the dishes and drops, and is collected in the washing hot water tank 8 through the filter. Used in circulation.

In this way, the washing pump 11 is turned off after a lapse of a predetermined washing time, and the rinsing pump 12 is turned on after a lapse of a predetermined rest time, and this time, high temperature hot water in the rinsing hot water tank 13, for example, 80 Hot water of ˜85 ° C. is ejected from the rinsing nozzle 7 and the rinsing operation is performed for a predetermined time.
In this rinsing operation, the rinse and detergent supply device 1
A rinse and a detergent are appropriately supplied by 4, 15. The tableware is sterilized by the hot water in the rinsing operation, and after the rinsing operation is stopped for a predetermined time, the tableware is dried by the residual heat. The hot water ejected from the rinsing nozzle 7 and used for rinsing is collected in the wash water tank 8, and the increased hot water is discharged through the overflow pipe 10. Further, the hot water discharged from the rinsing pump 12 is replenished from the water heater 3 into the rinsing hot water tank 8 via the ball tap 19.

[0009]

The conventional dishwasher as described above has the following problems. Since the booster equipped with the rinsing bath and the burner is configured separately from the main body of the washing machine and installed adjacent to each other, the installation space is large. Since the booster, which is a heat radiation source, is located at the foot of the washing machine, it is hot during work and the indoor environment is bad. The operation of the booster is troublesome. Hot water supply to the washing hot water tank and the rinsing hot water tank during the initial operation is troublesome because the hot water supply valve is manually opened and closed. Since the water heater for general hot water supply is used in common with other equipment, the hot water supply temperature is likely to fluctuate, and the predetermined cleaning hot water temperature is often not obtained, so that stable cleaning performance cannot be obtained. For the above reasons, the hot water supply temperature to the rinsing hot water tank also easily fluctuates, and since the control accuracy of the hot water temperature control device is generally poor, the hot water temperature in the rinsing hot water tank fluctuates depending on the hot water supply temperature, resulting in stable rinsing performance. Can't get Since the temperature of the rinse water is as high as 80-85 ℃,
It can be used for ceramic tableware, but not for glass or coated tableware. The present invention aims to solve such problems.

[0010]

In order to solve the above-mentioned problems, in the present invention, a cleaning hot water tank and a rinse hot water tank are housed in a storage room below a dishwashing room provided with a cleaning nozzle and a rinse nozzle. It consists of the main body of the machine and a water heater capable of supplying high-temperature hot water corresponding to the rinsing hot water. Tableware having a structure in which first and second hot water supply paths are provided, an opening / closing valve is provided in each of the first and second hot water supply paths, and a drive mechanism for changing a set temperature is installed in the hot and cold water constant temperature mixing valve. We propose a hot water supply mechanism for washing machines.

The present invention proposes that the hot and cold water constant temperature mixing valve is set to a temperature corresponding to the washing hot water and a temperature corresponding to the high rinsing hot water by the drive mechanism in this configuration.

[0012]

The hot water having a temperature suitable for cleaning can be supplied to the cleaning hot water tank by setting the hot water constant temperature mixing valve on the low temperature side and opening only the opening / closing valve of the first hot water supply path.

Further, by setting the hot and cold water constant temperature mixing valve on the high temperature side and opening only the open / close valve of the second hot water supply path,
It is possible to supply hot water having a temperature suitable for rinsing tableware made of ceramics to the rinsing bath.

Then, the hot water constant temperature mixing valve is set to a low temperature side and the opening / closing valve of the second hot water supply path is opened to supply hot water having a temperature suitable for rinsing dishes made of glass or coating to the rinsing hot water tank. be able to. When the temperature of the hot water supplied to the rinsing hot water tank is on the low temperature side as described above, it can be performed simultaneously with the supply of hot water to the washing hot water tank through the first hot water supply path.

As described above, since the hot water is supplied from the water heater to the washing hot water tank and the rinsing hot water tank after the temperature is adjusted to a predetermined temperature by the hot water constant temperature mixing valve, automation is easy.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 101 is the main body of the washing machine,
The washing machine main body 101 includes a dish washing room 102 and a storage room 103 below the dish washing room 102. The dish washing room 102 has a washing nozzle 104 and a rinsing nozzle 105 at the upper and lower positions, respectively.
Has been installed. In addition, in the storage chamber 103, a washing hot water tank 107 having a wide opening with an upper portion 106 protruding laterally is installed to receive hot water falling from the dish washing room 102, and in the lateral direction. A rinse bath 108 is installed below the protruding upper portion 106, and the rinse bath 108 has an appropriate heat retaining structure.

The washing water tank 107 is provided with a hot water temperature adjusting device having an electric heater 109 and a hot water temperature sensor 110, an overflow pipe 111 for draining water and a bottom drain port 112, which are connected to a drain pipe 113. ing. A drain valve 114 is provided in the drain pipe from the bottom drain port 112. Further wash bath 107
A liquid level switch 115 is provided as a water level detecting means.

Like the washing bath 107, the rinsing bath 108 is provided with a hot water temperature adjusting device having an electric heater 116 and a hot water temperature sensor 117, and a liquid level switch as a water level detecting means corresponding to a predetermined storage amount. 118 are provided.

The washing bath 107 and the washing nozzle 104 are connected by a pipe equipped with a washing pump 119, and the rinsing bath 1
08 and the rinsing nozzle 105 are connected by a pipe provided with a rinsing pump 120. Although illustration is omitted, appropriate rinse and detergent supply devices are installed at appropriate places in the main body 101 of the washing machine, as in the conventional washing machine.

Reference numeral 121 is a water heater, and this water heater 121
Is configured to be able to supply hot water, which is set to a temperature corresponding to high-temperature rinse water, for example, a temperature of about 80 to 85 ° C, by detecting running water and igniting a burner through a hot water supply pipe.

Reference numeral 122 is a hot and cold water constant temperature mixing valve. The hot and cold water constant temperature mixing valve 122 mixes the hot water and the water flowing in from the respective inlets to let the hot water at the set temperature flow out from the outlet. A configuration as shown in FIG. 2 can be applied.

That is, in FIG. 2, reference numeral 123 is a tubular valve body, and on the side surface of the valve body 123, there are hot water and water inlets 124 and 125 that are axially adjacent to each other, and the flow of the mixed hot water. exit
126 is provided. A mixing cylinder 127 is supported in the valve body 123 so as to be movable in the axial direction, and a cylindrical valve body 128 is provided on one end side of the mixing cylinder 127, the lower side in the drawing. Edges on both sides of the valve body 128 correspond to hot water and water inlets 124 and 125, respectively. And water inlet 125 and mixed hot water outlet 1
26 is communicated with the inside of the mixing cylinder 127 through the communication holes 129 and 130,
In addition, the hot water inlet 124 is provided with a mixing cylinder 127 through an edge of the valve body 128.
It is configured to communicate with the inside.

A rod-shaped element 131 containing a thermally expansive substance such as wax is installed coaxially inside the mixing cylinder 127. The element 131 pushes the mixing cylinder 127 toward the hot water inlet 124. I am trying. And element 131
On one side, that is, on the side away from the valve element 128, a temperature responsive portion in which the axial length 1 expands and contracts in accordance with expansion and contraction of the thermal expansion material.
132 is provided, and the end portion of the temperature responsive portion 132 is in contact with and supported by the operating body 133 for setting the hot water temperature. The actuation body 133 is moved in the axial direction of the valve body 123 by a driving source 134 such as a servomotor or by manual operation to position the support position, and the set temperature is changed by the support position. A compression coil spring 135 is interposed between one end of the mixing cylinder 127 and the valve body 123 so that the mixing cylinder 127 is pushed in the opposite direction to the pushing direction of the element 131.

The operation of the above configuration will be described. First, in the state of FIG. 2 in which the temperature of the mixed hot water is maintained at the set temperature, the temperature of the hot water in the mixing cylinder 127 rises because the pressure of the hot water rises or the hot water supply temperature of the water heater 121 rises. When the temperature becomes higher than the set temperature, the thermal expansion material in the element 131 expands according to the rising temperature, so that the length l of the temperature responsive portion 132
Becomes longer. In this case, the end of the temperature response unit 132 is
The element 131 is supported by the set position by 33.
Moves downward, and thus the mixing cylinder 127, and thus the valve element 128, also moves downward. Therefore, the edge of the valve body 128 and the hot water inlet 124
The space b between them, that is, the passage on the hot water side becomes narrower, and at the same time, the valve body
Since the distance a between the edge of 128 and the water inlet 125, that is, the passage on the water side is widened and the mixing ratio of the hot water is lowered, the temperature of the hot water is lowered.

On the contrary, when the water pressure becomes high or the hot water supply temperature of the water heater 121 is lowered to lower the temperature of the mixed hot water, the operation on the opposite side to the above causes the passage on the water side to be narrowed and at the same time to the hot water side. Since the passage of is widened and the mixing ratio of water is reduced,
The temperature of the mixed hot water rises.

By the above operation, the temperature of the mixed hot water is controlled by the operating body.
It is automatically adjusted to the set temperature corresponding to position 133.
The set temperature can be adjusted by moving the operating body 133 in the vertical direction in the figure by the drive source 134 to change the support position of the upper end of the temperature responsive portion 132. That is, if the actuating member 133 is moved to the first setting position on the lower side in the figure by the drive source 134, the set temperature can be set to the temperature on the low temperature side, for example, 65 ° C. By moving to the setting position of, the set temperature can be set to the high temperature side, for example, 80 ° C.

Hot water inlet 1 of constant temperature hot water mixing valve 122
A hot water supply pipe 136 from the water heater 121 is connected to 24, and a water supply pipe 137 is connected to a water inlet 125. The hot water supply pipe connected to the mixed hot water outlet 126 of the hot and cold water constant temperature mixing valve 122 is branched to form a first hot water supply path 138 to the washing hot water tank 107 and a second hot water supply path 139 to the rinse hot water tank 108. The first and second hot water supply paths 138 and 139 are provided with open / close valves 140 and 141, respectively.

The on-off valves 140 and 141 can be composed of solenoid valves or motor-operated valves. In the former case, a pressure absorbing device is installed in the path as necessary to prevent water hammer.

Next, an example of the driving operation of the configuration of FIG. 2 will be described.
In the usual washing of tableware made of ceramics or the like, at the start of operation, first, the drive source 134 is operated to move the operating body 133 to the set position on the low temperature side, and thus the set temperature of the hot and cold water constant temperature mixing valve 122 is set to the low temperature side. After the setting, only the opening / closing valve 140 of the first hot water supply path 138 is opened. In this state, the water heater 121
The hot water discharged from the hot water of, for example, 85 ° C. is mixed with water in the hot water constant temperature mixing valve 122 and lowered to a temperature suitable for washing, for example, 65 ° C., and passes through the first hot water supply path 138 to wash hot water tank 1
Supplied to 07. When the liquid is supplied to a predetermined water level, the liquid level switch 115 gives a signal to close the on-off valve 140. In this way, the supply of a predetermined amount of wash water to the wash water tank 107 can be automated.

When the supply of the wash water to the wash water tank 107 is completed and the on-off valve 140 is closed in this way, the drive source 134 is operated again to change the set temperature of the hot and cold water constant temperature mixing valve 122 to the high temperature side. , And only the open / close valve 141 of the second hot water supply path 139 is opened. In this state, hot water having a high temperature, for example, 80 ° C. is supplied from the hot water constant temperature mixing valve 122 to the rinsing hot water tank 108 via the second hot water supply path 139. Then, a predetermined amount is supplied, and the opening / closing valve 141 is closed by the operation of the liquid level switch 118 to complete the hot water supply.

In this way, the washing hot water tank 107 and the rinse hot water tank 108
The hot water supplied to is used for washing and rinsing dishes in the same manner as the conventional washing machine described above.

Next, when used for washing dishes made of glass or coating, when the hot water is supplied to the rinsing hot water tank 108 via the second hot water supply path 139 as described above, the set temperature of the hot and cold water constant temperature mixing valve 122 is Set to the low temperature side. By doing so, hot water at a temperature suitable for rinsing tableware made of glass or coating, for example, a temperature of 65 ° C. can be automatically supplied to the rinsing hot water tank 108. When the temperature of the hot water supplied to the rinsing hot water tank 108 is on the low temperature side, the hot water is supplied to the rinsing hot water tank 108 as follows.
This can be performed simultaneously with the supply of hot water to the washing hot water tank 107 through the first hot water supply path 138.

[0033]

As described above, the present invention has the following effects. Since the rinse bath can be stored in the storage chamber of the main body of the washing machine without the need for a booster, the installation space of the washing machine can be greatly reduced. The water heater has a high degree of freedom in installation, and it is not necessary to install it at the foot near the main body of the washing machine, so it will not be hot when working, and if it is installed outdoors, heat dissipation to the kitchen room will be eliminated, so it is possible to improve the indoor environment. In addition, since the piping for the fuel gas and the exhaust pipe to the room are not required, the workability is improved. By using the instantaneous water heater that can perform the ignition operation simply by opening the valve for hot water supply, not only the ignition operation like the booster is not necessary, but also the hot water supply to the washing and rinsing hot water tanks is automatically performed. It is very easy to operate and labor saving. Since the rinsing bath can be selectively supplied with hot water at a temperature suitable for rinsing ceramic tableware, and hot water at a temperature suitable for glass or coated tableware, there are many types of applicable tableware. The hot water supply temperature is stable by using a dedicated water heater independent of general hot water supply and a hot water constant temperature mixing valve, and stable washing performance and drying performance can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of an embodiment of a dishwasher to which a hot water supply mechanism of the present invention is applied.

FIG. 2 is a system diagram showing an embodiment of the overall configuration of a dishwasher to which the hot water supply mechanism of the present invention is applied.

FIG. 3 is a longitudinal sectional view showing the configuration of an embodiment of a hot and cold water constant temperature mixing valve applied to the hot water supply mechanism of the present invention.

FIG. 4 is a perspective view showing an appearance of an example of a conventional dishwasher.

FIG. 5 is a system diagram showing an appearance of an example of a conventional dishwasher.

[Explanation of symbols]

 101 Washer main body 102 Dishwashing room 103 Storage room 104 Cleaning nozzle 105 Rinsing nozzle 106 Top 107 Washing hot water tank 108 Rinsing hot water tank 109, 116 Electric heater 110, 117 Hot water temperature sensor 111 Overflow pipe 112 Bottom drain 113 Drain 114 114 Drain Valves 115, 118 Liquid level switch 119 Washing pump 120 Rinse pump 121 Water heater 122 Hot water constant temperature mixing valve 123 Valve body 124 Hot water inlet 125 Water inlet 126 Mixed hot water outlet 127 Mixing cylinder 128 Valve body 129, 130 Communication hole 131 Element 132 Temperature responsive portion 133 Actuator 134 Drive source 135 Compression coil spring 136 Hot water supply pipe 137 Water supply pipe 138 First hot water supply route 139 Second hot water supply route 140, 141 Open / close valve

Claims (2)

[Claims] 1. A washing machine main body having a washing bath and a rinsing bath in a storage chamber below a dishwashing chamber provided with a cleaning nozzle and a rinsing nozzle, and hot water corresponding to hot rinsing water can be supplied. The water heater comprises a water heater and first and second hot water supply paths from the hot water supply side and the water supply side of the water heater to the washing hot water tank and the rinse hot water tank through the hot water constant temperature mixing valve, respectively. An opening / closing valve is provided in each of the second hot water supply paths,
A hot water supply mechanism for a dishwasher, characterized in that a drive mechanism for changing a set temperature is installed in the hot water constant temperature mixing valve. 2. The hot water supply mechanism according to claim 1, wherein the hot and cold water constant temperature mixing valve is set to a low temperature side corresponding to the wash hot water and a high temperature side temperature corresponding to the high temperature rinsing hot water by a drive mechanism. Hot water supply mechanism in dishwasher characterized by