JPH07331A - Hot water feed mechanism for dish washer - Google Patents

Abstract

PURPOSE:To reduce the installation space of a large business dish washer, improve the kitchen environment, automate the operation, and increase the types of dishes applicable to washing. CONSTITUTION:This dish washer is constituted of a washer main body storing a washing hot water tank 107 and a rinsing hot water tank 108 in a storage chamber 103 below a dish washing chamber 102 provided with a washing nozzle 104 and a rinsing nozzle 105 and a water boiler 121 capable of feeding the high-temperature hot water corresponding to the rinsing hot water. A hot water feed mechanism is constituted of the first hot water feed passage 136 from the hot water feed side of the water boiler 121 and the water feed side to the washing hot water tank 107 via a water/hot water constant-temperature mixing valve 122 and the second hot water feed passage 138 from the hot water feed side of the water boiler 121 to the rinsing hot water tank 108. Switching valves 137, 139 are provided on the hot water feed passages 136, 138, respectively, and the third hot water feed passage 140 provided with a switching valve 141 is arranged between the downstream of the switching valve 137 of the first hot water feed passage 136 and the upstream of the switching valve 139 of the second hot water feed passage 138.

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. Supplying a predetermined amount of hot water 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 a machine body and a water heater capable of supplying high-temperature hot water corresponding to rinsing hot water, and the first hot water supply side and the first hot water supply side of the hot water heater are connected to a washing hot water tank through a hot water constant temperature mixing valve. A hot water supply path and a second hot water supply path from the hot water supply side of the water heater to the rinsing hot water tank are configured, and an opening / closing valve is provided in each hot water supply path, and a downstream side of the opening / closing valve of the first hot water supply path and a first hot water supply path are provided. A hot water supply mechanism for a dishwasher is proposed, which has a third hot water supply path provided with an open / close valve upstream of the open / close valve of the second hot water supply path.

[0011]

When the opening / closing valve of the first hot water supply path is opened while the opening / closing valve of the third hot water supply path is closed, the hot water on the hot water supply side of the water heater and the water on the water supply side have a constant hot water temperature. Hot water mixed by the mixing valve and having a temperature lowered to be suitable for cleaning is supplied to the cleaning hot water tank through the first hot water supply path. Further, when the on-off valve of the second hot water supply path is opened, the high-temperature hot water on the hot water supply side of the water heater is directly supplied to the rinse bath through the second hot water supply path.

Next, when the opening / closing valve of the third hot water supply path is opened while the opening / closing valve of the second hot water supply path is closed,
The hot water whose temperature has been lowered by being mixed by the hot / cold water constant temperature mixing valve reaches the second hot water supply path from the first hot water supply path to the third hot water supply path, and is supplied to the rinse hot water tank via this path.

As described above, hot water whose temperature has been lowered to a predetermined temperature by the hot water constant temperature mixing valve can be supplied to the washing hot water tank, and the hot water on the hot water supply side of the water heater can be supplied to the rinsing hot water tank. Hot water that has passed through the hot-water constant temperature mixing valve can be selectively supplied, and the hot water supply can be automated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2, reference numeral 101 is a main body of the washing machine, and the main body 101 of the washing machine is composed of a dishwashing room 102 and a storage room 103 below the washing room 102. The dish washing room 102 is provided with a washing nozzle 104 and a rinsing nozzle 105 at the upper and lower positions, respectively. In addition, in the storage room 103, the upper part 10
Cleaning bath 1 with a wide opening formed by projecting 6 horizontally
07 is installed to receive hot water falling from the dishwashing room 102, and a rinsing hot water tank 108 is installed below the laterally protruding upper portion 106. The rinsing hot water tank 108 has an appropriate heat retaining structure. I am trying.

A washing water tank 107 is provided with a hot water temperature adjusting device equipped with an electric heater 109 and a hot water temperature sensor 110, an overflow pipe 111 for draining 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 hot water, for example, a temperature of about 80 to 85 ° C., through hot water supply pipe B by detecting running water and igniting the burner.

Reference numeral 122 is a hot and cold water constant temperature mixing valve. The hot and cold water constant temperature mixing valve 122 mixes hot water and water flowing from the respective inlets with each other so that hot water having a set temperature flows out from the outlet. A configuration as shown in FIG. 3 can be applied.

That is, in FIG. 3, 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 in 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 actuating body 133 is configured to move in the axial direction of the valve body 123 by a driving source 134 such as a motor or a manual operation to position 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 opposite to the above causes the passage on the water side to be narrowed and at the same time. 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 hot water supply pipe B from the water heater 121 is branched into a hot water inlet 125 of the hot water constant temperature mixing valve 122 and a rinse hot water tank 108, and also reaches the hot water heater 121. The pipe branched from the water supply pipe A is a hot water constant temperature mixing valve.
It is connected to 122 water inlets 124.

Mixing hot water outlet 126 of hot and cold water constant temperature mixing valve 122
The hot water supply pipe B connected to the cleaning hot water tank 107 reaches the cleaning hot water tank 107, and the path from the hot water constant temperature mixing valve 122 to the cleaning hot water tank 107 constitutes the first hot water supply path 136. An opening / closing valve 137 is provided on the first hot water supply path 136.

On the other hand, the rinsing hot water tank 1 from the hot water supply side of the water heater 121
The hot water supply pipe B reaching 08 constitutes the second hot water supply path 138, and an opening / closing valve 139 is provided in the second hot water supply path 138.

The pipe forming the third hot water supply passage 140 is provided between the pipe on the upstream side of the opening / closing valve 137 of the first hot water supply passage 136 and the pipe on the downstream side of the opening / closing valve 139 of the second hot water supply passage 138. The third hot water supply path 140 is provided with an opening / closing valve 141.

The on-off valves 137, 139 and 141 can be composed of solenoid valves or motor operated valves, and in the former case, a pressure absorbing device is installed in the path as necessary in order to prevent a water hammer.

Next, the operation of the configuration of FIG. 2 will be described. First, at the start of operation, with the opening / closing valve 141 of the third hot water supply path 140 closed, the opening / closing valve 137 of the first hot water supply path 136 is opened and the opening / closing valve 139 of the second hot water supply path 138 is opened. And

In this state, the hot water on the hot water supply side of the water heater 121 and the water on the hot water supply side are mixed by the hot and cold water constant temperature mixing valve 122, and the hot water adjusted to a temperature suitable for cleaning, for example, 65 ° C. is the first hot water. It is supplied to the washing hot water tank 107 via the first hot water supply path 136. And when the water level is reached to the specified level, the liquid level switch
115 issues a signal to close the on-off valve 137. In this way, the supply of a predetermined amount of wash water to the wash water tank 107 can be automated. On the other hand, hot water from the water heater 121, for example, hot water of 80 ° C. is supplied to the rinsing hot water tank 108 as it is via the second hot water supply path 138, and the opening / closing valve 139 is controlled by the operation of the liquid level switch 118 to control the predetermined amount. Is automatically supplied. The hot water thus supplied to the washing hot water tank 107 and the rinsing hot water tank 108 in this manner is used for washing and rinsing the dishes in the same manner as the conventional operation described above.

The above operation is for cleaning the tableware made of ceramics, and when it is used for cleaning the tableware made of glass or coating, the second hot water supply path 1 is used when hot water is supplied to the rinsing bath 108.
The on-off valve 139 of 38 is closed, and the on-off valve of the third hot water supply path 140 is closed.
Open 141. In this state, the hot water mixed by the hot and cold water constant temperature mixing valve 122 and the temperature of which has been lowered reaches the second hot water supply route 138 from the first hot water supply route 136, the third hot water supply route 140, and the route 138. It is supplied to the rinse bath 108. Therefore, hot water at a temperature suitable for rinsing glass or coated dishes can be easily obtained and automatically supplied.

[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 First hot water supply path 138 Second hot water supply path 140 Third hot water supply path 137, 139, 141 Open / close valve

Claims (1)

[Claims] 1. A washing machine main body having a washing bath and a rinsing bath stored in a storage chamber below a dishwashing chamber provided with a cleaning nozzle and a rinsing nozzle, and high-temperature hot water corresponding to the rinsing bath can be supplied. The water heater comprises a water heater and a first hot water supply path from the hot water supply side and the water supply side of the water heater to the washing hot water tank through the hot water constant temperature mixing valve, and a first hot water supply path from the hot water supply side of the water heater to the rinse hot water tank. The two hot water supply paths are configured, and each hot water supply path is provided with an opening / closing valve, and an opening / closing valve is provided between the opening / closing valve of the first hot water supply path and the upstream side of the opening / closing valve of the second hot water supply path. A hot water supply mechanism in a dishwasher characterized by forming a third hot water supply path