JPH1019371A - Bath heater with water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with provision of a drain valve in a hot water injection circuit and to prevent a leakage of water and no-water burning to be caused by leaving the drain valve unclosed, by providing a bypass passage between the lowermost part of a connection passage from a check valve of the hot water injection circuit to a circulation circuit and a forward flow passage from a heat exchanger for reheating bathtub water of the circulation circuit to a bathtub. SOLUTION: A bath heater 1 with a water heater is equipped with a hot water supply circuit 3 wherein a boiler 12 for hot water supply is connected between a supply water source 8 and a hot water faucet 16 and a circulation circuit 6 which returns bath water to a bathtub 2 through a boiler 26 for reheating bathtub water, by a pump 4. Besides, it has a hot water injection circuit 7 connecting the downstream side of a heat exchanger 13 for hot water supply and the discharge side of the pump 4 of the circulation circuit 6. A bypass passage 45 is provided between the lowermost part of connection passages C and D stretching from the downstream side of a check valve 36 of the hot water injection circuit 7 to the circulation circuit 6 and an upstream-side part in the vicinity of a forward flow metal fitting 27 of a forward flow passage A from a heat exchanger 5 for reheating bathtub water of the circulation circuit 6 to the bathtub 2. Thereby hot water in the connection passages can be discharged into the circulation circuit 6 and a drain valve provided usually in the hot water injection circuit is dispensed with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath kettle provided with a water heater, which can prevent empty heating of a heat exchanger for additional heating.

[0002]

2. Description of the Related Art In recent years, a hot-water supply heat exchanger installed in a hot-water supply boiler has a hot-water supply circuit connected between a water supply source and a hot-water tap, and bath water in a bathtub has been pumped in a re-heating boiler. A circulation circuit that sends the heat to the reheater installed in the tank, returns to the bathtub after heating, and the downstream side of the heat exchanger for hot water supply of the hot water supply circuit and the circulation circuit via a pouring solenoid valve and a check valve. A bath kettle with a hot water supply provided with a pouring circuit for connection with a hot water supply is used. In this type of bath kettle with a water heater, downsizing such as a wall-mounted type is being promoted, so that the equipment layout and piping structure in the bath kettle tend to be subject to various restrictions.

FIG. 4 shows a configuration of a recirculating circuit side of a reheating bath of such a bathtub with a water heater. A recirculating circuit 100 is provided with a casing from a circulating adapter 102 provided in a bathtub 101 via a return fitting 103. 105, here reaches the reheating heat exchanger 106 installed in the reheating boiler 108 via a bath water flow switch 107 for detecting the water flow toward the reheating heat exchanger 106, the pump 112, After exiting from the reheating heat exchanger 106, it exits from the casing 105 via the going-off fitting 115, and is returned to the circulation adapter 10 again.
A flow path returning from 2 to the inside of the bathtub 101 is formed, and a bath thermistor 109 for detecting the temperature of hot and cold water and a water level sensor 110 for detecting the water level in the bathtub 101 as pressure are additionally provided.

[0004] The circulation circuit 100 is provided with a bypass flow path 127 for connecting an incoming flow path and a return flow path to the additional heat exchanger 106. This bypass channel 1
In order to prevent the hot water heated by the reheating heat exchanger 106 from being directly discharged into the bathtub 101, the heating capacity of the reheating boiler 108 is set to 27.
It is provided to prevent the generation of drain by balancing the water supply capacity to the pump 06 and to improve the pumping capacity of the pump or downsize the pump.

On the other hand, the pouring circuit 120 has one end connected downstream of a hot water supply heat exchanger of a hot water supply circuit (not shown), the other end having a pouring solenoid valve 121, a water amount sensor 122 for detecting a pouring amount, and a water amount sensor 122. And a pair of upper and lower check valves 123, and is connected to the discharge side of the pump 112 in the circulation circuit 100. The pouring solenoid valve 121, the water amount sensor 122, and the check valve 123 are connected in the vertical direction, and a drain plug is provided at the lowermost part of the connection flow path 126 between the check valve 123 and the connection part of the circulation circuit 100. 125 are provided.

[0006] If there is no restriction on the arrangement of the equipment and the piping space, it is possible to perform piping so as not to form the lowermost portion serving as a trap portion in the connection flow path 126. Since there is a strong demand for the formation of a drain plug 125, a drainage plug 125 is usually provided here as well, since a lowermost portion is inevitably formed in the connection flow path 126.

The drain plug 12 provided in the connection channel 126
In addition to 5, the return fitting 103 and the outgoing fitting 115 are also provided with drain plugs 116 and 117, respectively, in order to prevent freezing or corrosion due to hot water remaining in the circuit when the bath kettle is not used for a long time. , These drain plugs 125, 1
16, 117 are opened.

As shown in the figure, a pouring circuit 12 is generally used.
0 is connected to the discharge side of the pump 112 of the circulation circuit 100. When the pouring circuit 120 is connected to the suction side of the pump 112, when the pump 112 is operated to perform additional heating, the air from the pouring circuit 120 may be sucked and air may be injected into the circulation circuit 100. Then, after detecting the water level in the bathtub 101 after stopping the pump 112 and finishing the reheating, the water level sensor 110 is detected by the air in the circulation circuit 100.
This is because the detection accuracy of the bathtub 101 decreases, and it becomes difficult to accurately detect the water level of the bathtub 101.

[0009]

When reusing a bath kettle that has not been used for a long period of time, after closing each drain plug, hot water is dropped from the hot water supply circuit into the circulation circuit 100 via the pouring circuit 120, After the bathtub 101 is filled with hot water, the pump 112 is operated to flow bath water into the circulation circuit 100 to raise the temperature of the hot water to a predetermined temperature, and the bath water flow switch 107 is used to check the flow of the bath water. The operation of the additional boiler 108 is started to perform additional heating.

At this time, the drain plug 125 of the pouring circuit 120 is used.
If the user forgets to close the bath, the bath water in the bathtub 101 leaks out from the drain plug 125 and the reheating heat exchanger 106
The bath water will not be sent to a sufficient amount. In addition, at this time, since the water flow switch 107 of the circulation circuit 100 detects the flow of the bath water, the reheating boiler 108 continues to operate, and the reheating heat exchanger 106 is pulled up by the empty heating. State, and the equipment may be burned.

If the drain plug 117 provided in the outgoing channel of the circulation circuit 100 is forgotten to be closed, bath water leaks from the water during the additional heating circulation, but the amount of bath water in the bathtub 101 decreases. When the bath water flow switch 107 detects that the bath water does not flow through the additional heat exchanger 106, the additional heating is stopped, so that no empty heating occurs. Also, if the water drain plug 116 provided in the return flow path is forgotten to be closed, air enters and the bath water flow switch 107
Does not detect the flow of bath water from the beginning, so that additional heating is not performed and no empty heating occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to prevent an empty boiler from being fired, and to prevent a water drainage plug provided in a connection flow path of a pouring circuit from being closed. Provided is a bath kettle with a water heater that can also prevent leakage.

[0013]

According to a first aspect of the present invention, there is provided a bathtub with a water heater, wherein a heat exchanger for hot water supply installed in a boiler for hot water supply is connected between a water supply source and a hot water tap. A hot water supply circuit, a circulation circuit for sending bath water in the bathtub back to the reheating heat exchanger installed in the reheating boiler by a pump, and sending the bathwater to the bathtub, and a downstream side of the hot water supply heat exchanger and the circulation circuit. A pouring circuit for connecting the pump discharge side via a pouring solenoid valve and a check valve; a lowermost portion of a connection flow path from the check valve of the pouring circuit to the circulation circuit; A bypass flow path is connected to a position below the lowermost part of the outward flow path from the additional heat exchanger to the bathtub.

According to the bathtub with the water heater, since the hot water collected in the connection flow path is discharged from the bypass flow path to the outward flow path side of the circulation circuit, it is conventionally provided in the connection flow path of the pouring circuit. This eliminates the need for a drain plug, which can prevent leakage of water during additional heating due to forgetting to close the drain plug, and thus prevent empty firing of the additional boiler. Of course, the bypass flow path also has the function of a bypass flow path (see 127 in FIG. 4) conventionally connected between the forward flow path and the return flow path of the additional heat exchanger in the circulation circuit. Is what you do.

Further, a bath kettle with a water heater according to claim 2 includes the hot water supply circuit, the circulation circuit, and the pouring circuit, and the circulation circuit is provided with a bath water flow switch,
Connection of the pouring circuit of the circulation circuit in a bathtub with a water heater provided with a water drainage plug (see 125 in FIG. 4) at the lowermost part of the connection flow path from the check valve to the circulation circuit of the pouring circuit With a simple configuration in which a bath water flow switch is provided on the side of the additional heat exchanger relative to the section, it is possible to prevent empty heating. That is, the bath water leaks from the drain plug provided at the bottom of the connection flow path during the reheating cycle, but the bath water flow switch does not detect the flow of the bath water. The operation of is stopped, and empty burning is prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a bath water heater system 1 according to the present invention. This bath water heater 1 has a hot water heater installed in a hot water boiler 12. A heat exchanger 13 is connected between the water supply source 8 and the hot water tap 16, and a heat exchanger for reheating the bath water in the bathtub 2 in the reheating boiler 26 by the pump 4. Vessel 5
And then return to the bath 2, the downstream side of the hot water supply heat exchanger 13 and the pump 4 of the circulation circuit 6.
And a pouring circuit 7 for connecting to the discharge side.

The hot water supply circuit 3 passes from a water supply source 8 to a strainer fitting 9 and a water amount sensor 10 for counting the amount of water supply by rotation of an impeller, and is then supplied to a hot water supply boiler 12 provided with a gas burner 12A. The water supply thermistor 11, which has a flow path leading to the heat exchanger 13 and further from the hot water supply heat exchanger 13 and then to the hot water supply tap 16 for controlling the hot water supply, and to the hot water tap 16, A tapping thermistor 15 for detecting tapping temperature is provided.

The circulating circuit 6 enters a casing 21 from a circulating adapter 19 provided in the bathtub 2 via a return fitting 20 and a bath water flow switch 22 for detecting bath water flowing to the reheating heat exchanger 5 here. , Via the circulation pump 4
After reaching the additional heat exchanger 5 installed in the additional heat boiler 26 provided with the gas burner 26A, and further coming out of the additional heat exchanger 5, the casing 2 passes through the forward fitting 27.
1 to the outside and again from the circulation adapter 19 to the bathtub 2
A bath thermistor 23 having a flow path returning to the inside and detecting a bath water temperature, and a water level sensor 24 for detecting a water level in the bathtub based on a pressure change are additionally provided. The return fitting 20 and the outgoing fitting 27 are provided with drain plugs 30 and 31, respectively, as in the conventional case.

The pouring circuit 7 has one end connected downstream of the hot water regulating valve 14 of the hot water supply circuit 3 and the other end opening and closing the flow of hot water sent from the hot water regulating valve 14.
4. The circulation circuit 6 is connected to the discharge side of the pump 4 through a water amount sensor 35 for counting the amount of hot water by the rotation of the impeller and a double check valve 36. The pouring solenoid valve 34, the water amount sensor 35, and the check valve 36
The pouring solenoid valve 3 is vertically connected in this order from top to bottom.
4, a vacuum breaker 3 for preventing backflow
7 are provided.

Gas burner 1 provided in hot water supply boiler 12
2A and a gas burner 26A provided in the additional boiler 26
Are integrally formed with each other in the illustrated example, and the gas control valve 40
Although the gas is supplied from the gas source 42 through the common gas pipe 41 provided with these, these may be configured separately. Alternatively, the hot water supply boiler 12 and the additional boiler 26 may be configured separately. Further, as a boiler burner, a burner using a fluid fuel such as kerosene may be used.

This bath kettle 1 with a water heater is provided with each thermistor,
The controller 42 automatically controls each device based on detection values of sensors, switches, and the like, commands from a remote control operation unit (not shown), and the like. Further, the controller 42 is provided with an F point thermistor 43 for detecting the outside air temperature.
Is below a predetermined temperature, the anti-freezing heater 4
4 to keep the entire system at a predetermined temperature.

The lowermost part of the connection flow paths (C to D) from the downstream side of the check valve 36 of the pouring circuit 7 to the circulation circuit 6, and from the additional heat exchanger 5 to the bathtub 2 of the circulation circuit 6. Outgoing channel A
Flow path 4 between the upstream metal part 27
5 are provided. A portion of the going channel A near the upstream side of the going metal fitting 27 to which the connecting channel is connected is located below the lowermost portion of the connecting channel.

The bypass flow passage 45 has a smaller diameter than the inner diameters of the circulation circuit 6 and the pouring circuit 7, and the main flow of the hot water from the pouring circuit 7 to the circulation circuit 6 is merely a check valve 36. From the pump 4 to the discharge side of the pump 4, and the bath water flowing through the circulation circuit 6 mainly flows from the pump 4 through the additional heat exchanger 5 and returns to the bathtub 2. By the way, the drain passage plug (12 in FIG. 4) provided at the bottom of the connection passage of the pouring circuit is conventionally provided by the bypass passage 45.
5) and a bypass flow path provided between the outgoing flow path and the return flow path of the additional heat exchanger (see 127 in FIG. 4).
Is unnecessary, and the bypass passage 45 also functions as a conventional bypass passage.

An example of control by the controller 42 in the bath kettle 1 with a water heater having the above configuration will be described.

The first filling of the bath 2 is with the pouring solenoid valve 3.
4 is opened and hot water is supplied from the hot water supply circuit 3 through the pouring circuit 7 and the circulation circuit 6. The pouring solenoid valve 34 is closed when the number counted by the water amount sensor 35 reaches a set number corresponding to the hot water supply amount. And the water level sensor 24
This is repeated on the basis of the detected value, and when the water level sensor 24 detects the water level set by the remote controller or the like, the filling is completed.

Next, the pump 4 is operated to start reheating. By the operation of the pump 4, the bath water in the bathtub 2 is taken into the circulation circuit 6 from the circulation adapter 19, and after the bath water flow switch 22 detects the water flow, the operation of the additional boiler 26 is started. Then, the additional heating boiler 26 is stopped when the bath thermistor 23 reaches a target temperature set by a remote controller or the like.

When the water level drops due to the use of hot water in the bathtub 2, the pouring solenoid valve 34 is opened to add hot water. The pouring solenoid valve 34 is closed when the count number of the water amount sensor 35 reaches a target value corresponding to the amount of hot water to be added calculated from the detection value of the water level sensor 24 when the water level drops.

In the above embodiment, the bypass flow passage 45 is connected to the vicinity of the forward fitting 27 of the circulation circuit 6, but the bypass flow passage 45 is connected to the connection flow passage of the pouring circuit 7 in the forward flow passage A. The connection can be made at any position below the lowermost part of (C to D). However, the bypass passage 45 is connected to the forward fitting 27 of the circulation circuit 6.
, It is possible to provide the bypass passage 45 in the going fitting, thereby simplifying the piping and reducing the manufacturing cost.

FIG. 2 shows such a forward fitting 5 with a bypass passage.
0, the metal fitting 50 has a small-diameter portion 5 in which an upper inlet 51 and a lower outlet 52 constitute a bypass flow path 45.
3, a horizontal outlet 54 is provided above the small-diameter portion 53, and a horizontal inlet 55 is provided below the small-diameter portion 53. Also, the lower outlet 52
Is provided with a drain plug 31.

When the outgoing metal fitting 50 is used, the outgoing flow path A in the casing 21 is connected to the horizontal inflow port 55 below the metal fitting 50, and the outgoing flow path B outside the casing 21 is connected to the lower outflow port of the metal fitting 50. 52. On the other hand, pouring circuit 7
The connection flow path C formed on the side of the check valve 36 is connected to the upper inflow port 51 of the metal fitting 50, and the connection flow path D formed from the lowermost part of the pouring circuit 7 to the connection side to the circulation circuit 6 is connected to the metal fitting 50. It is connected to the upper lateral outlet 54.

By making such a connection, the fitting 5
The small-diameter portion 53 in 0 constitutes the bypass channel 45. Therefore, the piping structure around the bypass passage 45 is simple and small, which is extremely useful in making the bathtub 1 with a water heater compact.

In the example shown in the drawings, an example is shown in which the member having the small diameter portion 53 is fixed to the metal fitting body. However, these members may be integrally formed. It is not limited to a thin tube as in the above, and may be formed in an orifice shape. In addition, a check valve 36, a water amount sensor 35, a pouring solenoid valve 34, and a vacuum breaker 37 may be connected and integrated with the bypass upper flow inlet 51 of the going fitting 50 as shown in FIG.

FIG. 3 shows an embodiment of a bath kettle 1A with a water heater according to the second aspect of the present invention, and particularly shows a main configuration of a reheating recirculation circuit side. In this embodiment, a part of the hot water supply circuit and the pouring circuit 7 has the same configuration as that of the embodiment shown in FIG. 1, and the circulation circuit 6 has the same operation as that described in the embodiment. The same components are denoted by the same reference numerals and description thereof will be omitted.

In this embodiment, the bath water flow switch 22 for detecting the presence / absence of water flow to the additional heat exchanger 5 is connected to the connection of the pouring circuit 7 connected to the discharge side of the pump 4 of the circulation circuit 6. The other configuration is the same as the conventional one (see FIG. 4) except that it is also connected to the downstream side (the side of the additional heat exchanger 5). Drain stopper 125
However, a bypass passage 127 is provided between the forward passage and the return passage of the additional heat exchanger 5.

According to this embodiment, when the pump 4 is operated for additional heating with the water drain plug 125 forgotten to be closed, the bath water in the bathtub 2 leaks from the water drain plug 125 but the bath water flow Since the switch 22 does not detect the flow of the bath water, the operation of the additional boiler 26 is not performed. That is, the empty boiler 26 for additional heating is prevented. Of course, it is not possible to prevent water leakage from the drain plug 125, but it is possible to surely prevent burnout of the equipment due to empty heating.

The present invention is not limited to the above embodiments, but can be appropriately modified and embodied within the scope of the claimed invention. The method is not limited to the method described in the embodiment, and appropriate hot water supply control and additional heating control can be performed.

[0037]

According to the bath kettle with the water heater according to the first aspect of the present invention, the lowermost portion of the connection flow path from the check valve of the pouring circuit to the circulation circuit, and the heat for reheating the circulation circuit. Since a bypass flow path was provided between the exchanger and the outgoing flow path from the bathtub, there was no need to install a water drainage plug in the pouring circuit. Fire can be reliably prevented.

Further, according to the bath kettle with the water heater according to the second aspect, in the circulation circuit, a simple configuration in which the bath water flow switch is provided on the side of the additional heat exchanger with respect to the connection part of the pouring circuit. In addition, it is possible to reliably prevent empty burning.

[Brief description of the drawings]

FIG. 1 is an overall circuit configuration diagram of a bathtub with a water heater according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a forward fitting having a bypass passage according to the present invention.

FIG. 3 is a partial circuit configuration diagram showing a main configuration of a recirculation circuit side of a reheating bath of the bath kettle with a water heater according to the second embodiment of the present invention.

FIG. 4 is a partial circuit configuration diagram showing a main configuration on a reheating circulation circuit side in a conventional bath kettle with a water heater.

[Explanation of symbols]

 1, 1A bath kettle with water heater 2 bathtub 3 hot water supply circuit 4 pump 5 reheating heat exchanger 6 circulation circuit 7 pouring circuit 8 water supply source 12 hot water boiler 13 hot water heat exchanger 16 hot water tap 22 bath water flow switch 26 Boiler for reheating 34 Injection solenoid valve 36 Check valve 45 Bypass flow path

Claims (2)

[Claims] 1. A hot water supply circuit in which a hot water supply heat exchanger installed in a hot water supply boiler is connected between a water supply source and a hot water tap.
A circulation circuit for returning the bath water in the bathtub to the reheating heat exchanger installed in the reheating boiler by the pump, and sending the water to the bathtub, a downstream side of the hot water supply heat exchanger and a pump discharge side of the circulation circuit. In a bathtub with a water heater provided with a pouring circuit connected via a pouring solenoid valve and a check valve, a lowermost portion of a connection flow path from the check valve of the pouring circuit to the circulation circuit, A bath kettle with a water heater, characterized in that a bypass flow passage is connected to a position below the lowermost part of the flow passage from the reheating heat exchanger to the bathtub. 2. A hot water supply circuit, wherein a hot water supply heat exchanger installed in the hot water supply boiler is connected between a water supply source and a hot water tap.
A circulation circuit for returning the bath water in the bathtub to the reheating heat exchanger installed in the reheating boiler by the pump, and sending the water to the bathtub, a downstream side of the hot water supply heat exchanger and a pump discharge side of the circulation circuit. A pouring circuit connected via a pouring solenoid valve and a check valve is provided, a bath water flow switch is provided in the circulating circuit, and at the bottom of a connection flow path from the check valve to the circulating circuit of the pouring circuit. In a bath kettle with a water heater provided with a drain tap, a bath water flow switch is provided on the side of the reheating heat exchanger closer to the connection part of the pouring circuit of the circulation circuit. Bath kettle.