JPH0322688Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application and overview of the invention] The present invention provides a bath kettle with a hot water filling device, particularly a bath kettle in which both filling and reheating operations can be performed using a common heat exchanger. This technology allows a single hot water temperature sensor to detect the hot water temperature when filling and reheating the hot water, thereby reducing the number of required electric components to process the hot water temperature sensor and its signals. It is something to do.

[Prior art and issues]

There is a bathtub that automatically reheats the bathtub after the bathtub is filled with hot water to a target water level, thereby raising the temperature of the water in the bathtub by the amount that has cooled while the bathtub is being filled.

An example of a bathtub having such a function is the one shown in FIG. 5 disclosed in Japanese Utility Model Application Publication No. 59-54038.

A forced circulation pump P is inserted into a circulation channel 41 formed to circulate between the bathtub 40 and the heat exchanger 5, and a water supply circuit 6 is connected to the upstream side of the pump P. A flow path switching valve 50 is inserted at the connection point between the water supply circuit 6 and the circulation flow path 41. Further, a first hot water temperature sensor 81 for filling hot water and a second hot water temperature sensor 82 for reheating are respectively disposed on the upstream and downstream sides of the heat exchanger 5.

In this case, when a hot water filling switch (not shown) is turned on and hot water is filled, the pump P is activated and the gas burner 52 is put into a combustion state, and the flow path switching valve 50 is switched to switch from the water supply circuit 6 to the flow path. Valve 5
0→Pump P→Heat Exchanger 5→Water flows into the flow path for filling with hot water that connects with the bathtub 40, and the operation of filling the bathtub 40 with hot water starts. At the time of filling the hot water, the separately set hot water filling temperature and the first hot water temperature sensor 81 are used.
gas burner 5 so that the water temperatures detected by the
Control the combustion amount of 2.

Next, the water amount counter 83 inserted into the water supply circuit 6
When it is determined that the set amount of hot water has been filled into the bathtub 40 by determining the output of The bathing water in the bathtub 40 is reheated by the operation of the pump P and the continued combustion of the gas burner 52. In other words, it warms up the inside of the bathtub, which has dropped in temperature during the filling process. At the time of reheating, the temperature of the bathing water flowing through the circulation flow path 41 is monitored by the second hot water temperature sensor 82 for reheating provided on the upstream side of the heat exchanger 5, and the temperature is adjusted to the set temperature. The above reheating is continued until the temperature is reached.

With this device, since the single heat exchanger 5 can be used to perform hot water filling and reheating operations, there is no need to provide separate heat exchangers for hot water filling and reheating, and the appliance It has the advantage that it can be made smaller.

However, in the above-mentioned conventional system, the water temperature is monitored by the first hot water temperature sensor 81 disposed downstream of the heat exchanger 5 during filling, and the temperature of the heat exchanger 5 is monitored during subsequent reheating. Since the hot water temperature must be monitored by the second hot water temperature sensor 82 on the upstream side,
Separate hot water temperature sensors are required for each operation of hot water filling and reheating. In addition, related components such as comparators for comparing the water temperature detected by each of these water temperature sensors with the set temperature are required for each of these water temperature sensors, which causes the problem of complicating the electric circuit and equipment control.

This idea was created in view of the above points,
= Loop-shaped circulation channel 41 communicating within the bathtub 40
, the heat exchanger 5, the pump P, and the hot water temperature sensor disposed in the circulation passage 41, and the circulation passage 4.
A water supply circuit 6 connected to the upstream side of the pump P in 1, and a flow path switching valve 50 disposed at the connection between the circulation circuit 41 and the water supply circuit 6 are provided, and the flow path switching valve 5
By switching 0, a reheating state in which the circulation flow path 41 is established and the water supply circuit 6 is cut off, and a reheating state in which the circulation flow path 41 is cut off and the water supply circuit 6 is opened are selected. Something that can be switched all at once〓
The object of the present invention is to enable a single hot water temperature sensor in the water circuit to monitor the hot water temperature during reheating and filling the water, thereby reducing the number of necessary electrical components.

The technical means of the present invention for solving the above problems will be described with reference to FIGS. 1 and 2. The technical means of the present invention is as follows: The hot water temperature sensor 32 is located at the bottom, and a short-circuit flow path 48 is formed to connect the downstream side of both the pump P and the heat exchanger 5 to the flow path between the flow path switching valve 50 and the hot water temperature sensor 32. Short circuit flow path 4
An auxiliary switching valve 54 is provided at the connection between the heat exchanger 8 and the downstream flow path of the heat exchanger 5, and the auxiliary switching valve 54 establishes the circulation flow path 41 and blocks the short-circuit flow path 48. It is possible to alternatively switch between the hot water filling state and the opposite state in which the circulation flow path 41 is shut off and the short-circuit flow path 48 is opened.

[Effect]

The above technical means works as follows.

When filling water as shown in FIG. 1, the flow path switching valve 5
0 switches to the same state as the conventional one described above,
The flow path continues from the water supply circuit 6 to the flow path switching valve 50 to the pump P and heat exchanger 5 to the auxiliary switching valve 54 and becomes connected. Also, during the filling process, the auxiliary switching valve 54 is connected to the short-circuit flow path 48 side,
A flow path is established from the short-circuit flow path 48 to the bathtub 40 via the hot water temperature sensor 32 portion. That is, a flow path is formed in which the hot water temperature sensor 32 is located downstream of the heat exchanger 5. Then, the hot water temperature sensor 32 monitors the temperature of the hot water for filling hot water heated by the heat exchanger 5, and the hot water filling operation proceeds in this state.

Next, when the reheating state is reached after filling the hot water, as in the conventional system described above, the flow path switching valve 50 is activated as described above.
is switched, the water supply circuit 6 is cut off, and in conjunction with this, the auxiliary switching valve 54 is switched,
As shown in FIG. 2, the downstream flow path of the heat exchanger 5 is directly connected to the bathtub 40 without passing through the short-circuit flow path 48.

Then, flow path switching valve 50 → pump P and heat exchanger 5 → auxiliary switching valve 54 → bathtub 40 → flow path switching valve 5
A circulation flow path 41 connected to 0 is established,
Contrary to the above-mentioned case of filling with hot water, the hot water temperature sensor 32 is located on the upstream side of the heat exchanger 5. That is, at the time of reheating, the temperature of the water before being heated by the heat exchanger 5, that is, the temperature inside the bathtub, can be detected by the hot water temperature sensor 32, so that the temperature inside the bathtub 40 can be detected by the hot water temperature sensor 32. This means that reheating work can be carried out while monitoring.

As described above, according to the above technical means of the present invention, at both the time of filling the hot water and reheating the water,
The hot water temperature can be managed with a single hot water temperature sensor 32.

〔effect〕

The present invention has the following unique effects.

Single hot water temperature sensor 3 for hot water filling temperature and reheating temperature
Since the hot water temperature can be controlled with only two hot water temperature sensors, the number of hot water temperature sensors and related electrical components required can be reduced compared to the conventional system that requires two hot water temperature sensors.

〔Example〕

Next, the embodiments of the present invention described above will be described in detail with reference to the drawings.

In the embodiment shown in FIG. 3, pump P → heat exchanger 5
→Auxiliary switching valve 54→Bathtub 40→Water temperature sensor 32→
Flow path switching valve 50→Circulation flow path 41 connected to pump P
It is configured to supply water using a hopper 60 to
Connected by 8. Further, a water supply circuit 6 from a hopper 60 is connected to the flow path switching valve 50 portion, and a water supply valve 63 is inserted into the water circuit on the upstream side of the hopper 60.

Further, the output of the hot water temperature sensor 32 disposed in the circulation flow path 41 is compared with the output of the hot water temperature setting device 34 by a comparator 33. The opening of a proportional valve 31 inserted into the gas circuit is controlled.

The apparatus of this embodiment employs an electric circuit configuration as shown in FIG.

The hot water temperature adjusting device 3, which is composed of a hot water temperature sensor 32, a hot water temperature setting device 34, and a comparator 33 that compares the outputs of both, a relay 7, and a pump P are connected in parallel, and furthermore, these parts and flow path switching are connected in parallel. valve 50,
Parallel circuits of the auxiliary switching valve 54 and the water supply valve 63 are connected in parallel. Further, a hot water filling switch A is inserted in the parallel circuit of the relay 7 and the pump P so as to be in series, and the normally open output contact 71 of the relay 7 is connected to the water level switch 21 that detects the water level in the bathtub 40. It is connected in series with the circuit of the flow path switching valve 50 together with one normally closed contact 23 . The other normally closed output contact 24 of the water level switch 21 is inserted into the circuit of the relay 7.

In the embodiment described above, when the power switch D is turned on and the hot water filling switch A is closed, the hot water temperature adjusting device 3 and the pump P are brought into conduction, and the flow path switching valve 50 and the pump P connected in parallel are connected to the hot water temperature adjusting device 3 and the pump P. The auxiliary switching valve 54 and the water supply valve 63 are opened. Then,
Water from the water supply circuit 6 is routed through the flow path switching valve 50 → pump P → heat exchanger 5 → auxiliary switching valve 54 → short circuit flow path 48
→ Water temperature sensor 32 → Bathtub 40 is supplied,
It is filled with hot water.

When filling the hot water, the hot water temperature sensor 32 is located downstream of the heat exchanger 5, and the hot water temperature sensor 32 detects the temperature of the hot water heated by the heat exchanger 5. The detected temperature and hot water temperature setting device 3
The set temperatures of 4 are compared by the comparator 33, and the comparator 33 can fill the water to a predetermined temperature while controlling the opening of the proportional valve 31.

Next, when the water level in the bathtub 40 reaches the target water level, the water level switch 21 is activated, the water supply valve 63 is brought into a non-conducting state and closed, and the filling of hot water is stopped. or,
Pump P is maintained in operation.

Similarly, the flow path switching valve 50 and the auxiliary switching valve 54 are brought into a non-conducting state and perform a flow path switching operation. That is, the flow path switching valve 50 cuts off the water supply circuit 6 and switches to the state where the pump P is connected to the hot water temperature sensor 32 side, and the other auxiliary switching valve 54
In this case, the heat exchanger 5 is switched to a state in which it is directly connected to the bathtub 40 without passing through the short-circuit flow path 48.

As a result, a circulation flow path 41 is formed that circulates from heat exchanger 5 → auxiliary switching valve 54 → bathtub 40 → hot water temperature sensor 32 → flow path switching valve 50 → pump P → heat exchanger 5, and the above-mentioned Contrary to when the water was filled,
The hot water temperature sensor 32 will be located upstream of the heat exchanger 5. Thereby, the bathing water in the bathtub 40 is forcibly heated and circulated within the circulation flow path 41.

During this circulation, if the bathing water temperature detected by the hot water temperature sensor 32 is lower than the set temperature of the hot water temperature setting device 34 (if the inside of the bathtub 40 cools down due to natural heat radiation while filling with hot water as described above), The proportional valve 31 is kept fully open until the temperature reaches the set temperature of the hot water temperature setting device 34, and the inside of the bathtub 40 is reheated. That is,
Reheating can be performed using the same hot water temperature sensor 32 used when filling the water.

Further, after reheating the inside of the bathtub 40, when the temperature inside the bathtub 40 naturally drops after a certain period of time has passed, the temperature drop 32 detects the temperature drop and turns on the gas burner 5.
Reheating is performed in the same manner as described above until the water starts to burn and the temperature in the bathtub reaches the set temperature of the hot water temperature setting device 34.

In the above embodiment, if the inside of the bathtub 40 has cooled down after filling with hot water, the inside of the bathtub 40 is automatically reheated, but the water level switch 21 can be operated manually. Alternatively, a separate reheating switch may be provided so that the interior of the bathtub 40 can be reheated manually.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the water circuit configuration of the present invention;
Fig. 3 is an explanatory diagram of the embodiment of the present invention, Fig. 4 is a control circuit diagram thereof, and Fig. 5 is an explanatory diagram of a conventional example.
. . . Hot water temperature sensor, 41 . . . Circulation flow path, 48 . . . Short circuit flow path, 50 .

Claims (1)

[Scope of utility model registration request] A loop-shaped circulation channel 41 communicating with the inside of the bathtub 40
, the heat exchanger 5, the pump P, and the hot water temperature sensor disposed in the circulation passage 41, and the circulation passage 4.
A water supply circuit 6 connected to the upstream side of the pump P in 1, and a flow path switching valve 50 disposed at the connection between the circulation circuit 41 and the water supply circuit 6 are provided, and the flow path switching valve 5
By switching 0, a reheating state in which the circulation flow path 41 is established and the water supply circuit 6 is cut off, and a reheating state in which the circulation flow path 41 is cut off and the water supply circuit 6 is opened are selected. In the device that is configured to switch uniformly, the hot water temperature sensor 32 is located upstream of the flow path switching valve 50 in the circulation flow path 41, and the flow path is switched between the downstream side of both the pump P and the heat exchanger 5. A short-circuit flow path 48 is formed that connects the flow path between the valve 50 and the hot water temperature sensor 32, and an auxiliary switching valve 54 is provided at the connection between the short-circuit flow path 48 and the downstream flow path of the heat exchanger 5.
is provided, and the auxiliary switching valve 54 allows the circulation flow path 4 to
A hot water supply system capable of selectively switching between a reheating state in which the condition 1 is established and the short circuit passage 48 is shut off, and a hot water filled state in which the circulation passage 41 is shut off and the short circuit passage 48 is opened. A bathtub with a tensioning device.