JP2003106669A - Heat exchanger for sanitary washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a component and power saving type heat exchanger for a sanitary washer that heats, thermally insulates and instantaneously heats washing water by means of one heater. SOLUTION: The heat exchanger for a sanitary washer has a hot water storage tank 11 having an inlet 13 for the washing water 44 and having an outlet 14 for discharging the washing water 44 heated to a low temperature, a heating chamber 15 located in a lower position in the hot water storage tank 11, connected to the outlet 14 by a communicating pipe 18 and parted from the washing water 44 in the hot water storage tank 11 by a substantially good thermally conductive material, and the heater 19 located in the heating chamber 15. The heater 19 heats the washing water 44 in the hot water storage tank 11 to a low temperature, and instantaneously heats the low-temperature heated washing water introduced via the communicating pipe 18 from the outlet 14 at hot water delivery further to a given temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in a sanitary washing device in which washing water supplied from a water supply source is heated to a proper temperature water having a predetermined temperature and the hot water is jetted locally. Regarding improvement.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventionally known sanitary washing device attached to a toilet has a casing 61 fixed to an upper rear portion of a toilet bowl 60, and a casing 61 is attached to the toilet seat. 62 and a toilet lid 63 are attached so that they can be opened and closed, and the toilet seat 6 is attached to the casing 61.
A nozzle portion 64 is provided that protrudes from the lower part of 2 into the toilet bowl 60 so as to be able to move forward and backward. And as shown in FIG. 4, between the nozzle part 64 which comprises a part of sanitary washing | cleaning apparatus, and the water supply pipe 65 whose upstream end is fixed to the water stopcock etc. which are an external water supply port. A valve unit 66 for turning on / off the supplied water and a heat exchanger 6 for heating the supplied water
7 is provided. In the conventional example shown in FIG. 4, the heat exchanger 67 has a hot water storage tank 68, a heater 69 arranged in the hot water storage tank 68, and a temperature sensor 69a for measuring the temperature of the hot water in the hot water storage tank 68, and controls it. The heater 70 is turned on / off by the device 70 while monitoring the temperature detected by the temperature sensor 69a to keep the hot water temperature in the hot water storage tank 68 substantially constant. In addition, as described above, the hot water storage tank 6
In addition to the type of hot water storage type heat exchanger in which hot water of a constant temperature is stored in 8, as shown in FIG. 5, the water sent from the valve unit by the water supply pipe 71 is instantaneously heated by the pipe-shaped heater 72. However, there is also a type of an instant heating type heat exchanger in which hot water is supplied from the hot water outlet 73 to the nozzle portion. In addition, 74 is a temperature sensor and 75 is a heating chamber.

[0003]

However, in the conventional hot water storage heat exchanger, the temperature of the hot water must be kept constant at all times. Therefore, when the temperature falls below a certain temperature, the heater 69 is turned on to keep the certain temperature. When it exceeds, it is necessary to always perform on-off control to turn off the heater,
There is a problem that useless electric energy is consumed when the number of uses is small. Further, in this hot water storage type heat exchanger, since the water is supplied after the hot water in the hot water storage tank 68 is reduced, the temperature of the hot water gradually decreases with use, and if the hot water is continuously used, Water having a temperature considerably lower than the set temperature is jetted from the nozzle head toward the local area, which may cause discomfort to the user.

On the other hand, in the instant heating type heat exchanger, the electric heating element on the surface of the heater can instantly heat the washing water to the set temperature. Therefore, there is an advantage that hot water of a constant temperature can be jetted from the nozzle portion for a long time. However, there is a limit to the power that can be used in ordinary households (usually 1200
w), it is necessary to reduce the flow rate to raise the temperature of the hot water to the set temperature. For example, the amount of water that can be heated up to a preset temperature of 40 ° C. by using a heater of 1200 w at a set temperature of 5 ° C. is as follows:
The amount of hot water may be insufficient for some people at about cc / min. (40 ° C-5 ° C) x Q / 60 x 4.19 = 1200w (1)

In order to solve such a problem, for example, in Japanese Unexamined Patent Publication No. 2000-336733, a first heater and a second heater are provided in a hot water storage tank, and the first heater is used to control the temperature inside the hot water storage tank. The water is preheated, and the hot water preheated by the second heater is further heated to a predetermined temperature to supply the hot water to the nozzle portion. As a result, the temperature of the hot water in the hot water storage tank can be low, and power can be saved. However, in the technique described in this publication, there are problems that the first and second heaters are required, which increases the manufacturing cost and that the structure is complicated because two heaters are used. The present invention has been made in view of the above circumstances, and keeps hot water in a hot water storage tank with one heater and instantaneously heats when hot water is discharged, and even when hot water in a preheated hot water storage tank is used up. , Hot water can be sent to the nozzle part,
An object of the present invention is to provide a heat exchanger for a sanitary washing device which consumes less power and is relatively simple and has a small number of parts.

[0006]

A heat exchanger of a sanitary washing device according to the present invention which meets the above-mentioned object is a sanitary washing device which is attached to a toilet bowl and jets hot water locally to wash the sanitary washing device. A hot water storage tank provided with an outlet for discharging the wash water heated at low temperature; and a wash water in the hot water storage tank, which is arranged at a lower position of the hot water storage tank and is connected to the outlet by a communication pipe. Has a heating chamber substantially divided by a good heat conductive material, and a heater arranged in the heating chamber, the cleaning water in the hot water storage tank is heated to a low temperature by the heater, and from the outlet when tapping hot water. The cleaning water heated at low temperature introduced through the communication pipe is further instantaneously heated to a predetermined temperature by the heater (heater). As a result, the heating chamber is heated by one heater, and the heat heats the water in the hot water storage tank. Also, since the hot water in the hot water storage tank is heated at a low temperature, it consumes less power, and when it comes out, it is further heated by this heater.
Hot water of a predetermined temperature can be obtained.

In the heat exchanger of the sanitary washing device according to the present invention, the heater may be composed of a cylindrical ceramic heater, and the washing water to be heated may flow on the outside and the inside thereof. As a result, hot water is heated outside and inside the ceramic heater. Further, in the heat exchanger of the sanitary washing device according to the present invention, it is preferable that the communication pipe is formed along the side wall of the hot water storage tank or inside the hot water storage tank. It can be prevented from being cooled by the outside air. Further, in the heat exchanger of the sanitary washing device according to the present invention, a hot water storage temperature sensor and a hot water discharge temperature sensor are respectively provided on the outlet side of the hot water storage tank and the heating chamber, and the heat generation amount of the heater is controlled to control the heat generation. It is preferable to control the temperature of the wash water for the hot water storage tank and the temperature of the hot water on the outlet side of the heating chamber. This makes it possible to obtain hot water at a more accurate temperature.

In the heat exchanger of the sanitary washing device according to the present invention, it is preferable that the temperature in the hot water storage tank is set lower than the lower limit value of the set temperature on the outlet side of the heating chamber. Energy can be efficiently saved regardless of the outlet temperature of the heating chamber. In the heat exchanger of the sanitary washing device according to the present invention, the hot water storage temperature Twt (° C) in the hot water storage tank is the maximum hot water discharge temperature Tmax (° C) at the outlet side of the heating chamber and the maximum discharge flow rate Qmax (cc / cc /
min) and the rated power consumption W (watt) of the heater
In this case, it is preferable to satisfy the formula Twt ≧ Tmax−14.3 · W / Qmax. As a result, the hot water having the predetermined flow rate (Q) can be reliably secured at the predetermined temperature (Tmax).

The heat exchanger of the sanitary washing device according to the present invention has a power saving mode for saving power consumption, and when the power saving mode is selected, the hot water storage temperature in the hot water storage tank is higher than that in the case where the power saving mode is not selected. Is preferably controlled to be low. As a result, the amount of power used can be reduced. Further, in the heat exchanger of the sanitary washing device according to the present invention, a seating detection sensor for detecting whether or not a person is sitting on the toilet seat is provided, and when the seating detection sensor detects seating when the power saving mode is selected, the power saving mode is set. Is preferably canceled. This makes it possible to secure the flow rate of hot water and the temperature of hot water while performing power saving processing. Furthermore, in this case, when the seating detection sensor does not detect the seating when the power saving mode is selected, the heater in the heating chamber is not energized, and when the seating detection sensor detects the sitting, the heater in the heating chamber is turned on. It is also possible to control the temperature of hot water stored in the heating chamber by turning on electricity. In this case, if the time required to use the sanitary washing device after the seating detection sensor detects a person is long, the water in the hot water storage tank will be heated to some extent. Can be supplied.

In the heat exchanger of the sanitary washing device according to the present invention, it is more preferable that hot water is discharged toward the human body after the hot water on the downstream side is completely discharged from the heating chamber to the outside of the sanitary washing device. As a result, it is possible to prevent the hot water in the heating chamber directly heated by the heater when the hot water is kept warm from being discharged toward the human body. Further, in the heat exchanger of the sanitary washing device according to the present invention, during the hot water heating control in the hot water storage tank, the surface temperature of the heater in the heating chamber is controlled to be equal to or lower than the upper limit value of the set water temperature of the hot water discharged. Is preferred. As a result, it is possible not only to prevent the user from being burned by inadvertently ejecting hot water above the upper limit value of the set water temperature when tapping hot water, but also to prevent overheating of the heater. Then, in the heat exchanger of the sanitary washing device according to the present invention, a heat insulating material may be provided around the hot water storage tank. This reduces heat loss and allows the water in the hot water storage tank to be heated with less electric power.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic explanatory view of a heat exchanger of a sanitary washing device according to an embodiment of the present invention, and FIG. 2 is a cutaway plan view of the same portion. As shown in FIG. 1, a heat exchanger 10 of a sanitary washing device according to an embodiment of the present invention includes a plastic hot water storage tank 11 for storing hot water. At one side of the lower position of the hot water storage tank 11, the wash water inlet 1 is provided.
3, an outlet 14 for washing water heated at a low temperature is provided at the upper part. A position slightly lower than the intermediate position on the other side of the hot water storage tank 11 (1/4 to 1 of the height of the hot water storage tank 11
The heating chamber 15 is provided at the position (/ 3 position).
The inlet 17 formed at the base end of the bottomed cylindrical outer cylindrical body 16 and the outlet 14 of the hot water storage tank 11 have a communication pipe 18
Are connected by. The communication pipe 18 is piped along the ceiling portion of the hot water storage tank 11 and the sidewall of the hot water storage tank 11. The outer cylindrical body 16 is made of a material having good heat conductivity such as copper, brass, or aluminum, and has a tubular shape (cylindrical shape) inside.
The ceramic heater (an example of the heater) 19 is provided horizontally.

A mounting flange 20 is provided on the base side of the tubular ceramic heater 19 at a distance from the end, and the tubular ceramic heater 19 is held horizontally on the side wall of the hot water storage tank 11. The end of the tubular ceramic heater 19 projects from the mounting flange 20,
The hot water outlet 21 is formed. A hot water outlet 22 is integrally provided on the outside of the hot water storage tank 11, and the hot water outlet 22 includes a lower hot water outlet chamber 23 and a vacuum breaker 25 connected to the hot water outlet chamber 23 through a water passage 24. A hot water inlet 26 is provided in the lower portion of the hot water outlet chamber 23, and is connected to a hot water outlet 21 of the tubular ceramic heater 19 by an L-shaped pipe joint 27. The side wall of the vacuum breaker 25 is provided with a hot water outlet 30 to which a hot water supply pipe 29 that guides appropriate temperature water to the nozzle portion 28 shown in FIG. 2 is connected. The lower inlet 13 of the hot water storage tank 11 projects outward and is connected to the outer valve unit 31 as shown in FIG.

A water level sensor 32 is provided on the upper part of the hot water storage tank 11 to detect that the cleaning water is above a predetermined level in order to prevent empty heating, and a hot water storage temperature sensor is provided on the upper part of the hot water storage tank 11. 33 is provided. On the other hand, an outlet temperature sensor 34 is also provided in the outlet chamber 23. Water level sensor 32, hot water temperature sensor 33
The signal from the hot water outlet temperature sensor 34 is output to the control unit 36 that controls the entire sanitary washing device 35. The control unit 36 includes a hot water outlet temperature control unit 37 and the hot water storage tank 11.
It has a hot water storage temperature control unit 38 for controlling the hot water storage temperature therein. The control unit 36 is also connected to a hot water outlet temperature setting unit 40 that sets the hot water outlet temperature and a setting device 42 that includes a power saving mode setting unit 41 that determines whether or not to operate in the power saving mode. Further, an output signal of the seating detection sensor 43 that confirms that the user is sitting on the toilet seat is input to the control unit 36.

The operation of the heat exchanger 10 of the sanitary washing device configured as described above will be described in detail below. First, the operation when the power saving mode setting unit 41 is in the non-power saving mode will be described. To do. Wash water 44 such as tap water is filled in the hot water storage tank 11 through the valve unit 31 and the inlet 13 in a full state. Hot water storage tank 11
The water level sensor 32 confirms that the water level is full. In the initial stage of use, it is hard to say that the heating chamber 15 is full even if the hot water storage tank 11 is filled with flush water. Therefore, a small hole is provided in a part of the heating chamber 15 or a lower portion of the communication pipe 18. It is preferable to set. Hot water storage tank 11 through these small holes
The wash water 44 enters the heating chamber 15 from the inside, and as a result, the hot water storage tank 11, the heating chamber 15, and the hot water outlet 22 are filled with the wash water. Further, the minute hole may have a check valve structure. In a state where the heating chamber 15 is not filled with water (a state in which no water pressure is generated in the heating chamber), micropores are allowed to pass through the hot water storage tank 11 so that the heating chamber 15 is full of water (the water pressure in the heating chamber is (The condition that occurred)
Then, the check valve is closed, so that the cold water supplied to the hot water storage tank 11 can be prevented from flowing into the heating chamber 15 through the minute holes. In addition, at the stage of initial setting,
The function of the water level sensor 32 may be stopped, and the heater 44 may be turned on after confirming that the cleaning water 44 is discharged from the nozzle portion 28 using a flow rate sensor or the like.

When the ceramic heater 19 is energized in this state, the ceramic heater 19 generates heat and the heating chamber 1
The washing water in 5 is heated. Since the outer cylindrical body 16 having a bottomed cylindrical shape is formed of a material having good thermal conductivity, the heating chamber 1
The temperature of 5 is transmitted to the wash water 44 in the hot water storage tank 11, and the wash water 44 becomes hot water. Since the hot water storage temperature sensor 33 is provided in the hot water storage tank 11, when the hot water in the hot water storage tank 11 reaches a predetermined temperature (for example, 20 to 30 ° C.), the energization of the ceramic heater 19 is stopped. After that, when the temperature in the hot water storage tank 11 reaches a constant value (for example, a temperature 1 ° C. lower than the set value), the ceramic heater 19 is turned on again, and as a result, the hot water in the hot water storage tank 11 is kept near the set temperature. become. The above control for maintaining the wash water 44 in the hot water storage tank 11 at a constant temperature is performed by the hot water storage temperature control unit 38. In this case, in the conventional case, the cleaning water in the hot water storage tank was heated to near the use temperature (for example, 40 ° C.), so compared to the case where the ceramic heater is heated so as to maintain the state of 40 ° C. 20 to 20
Heating to keep the temperature near any temperature in the range of 30 ° C. results in lower power consumption. That is, the power consumption balances with the heat loss, but when the set temperature is high, the temperature difference from the outside air becomes large and more heat loss occurs.

In this state, when the nozzle portion 28 of the sanitary washing device 35 is activated, the hot water temperature control portion 37 is activated,
The temperature of the hot water sent to the nozzle unit 28 is controlled as follows. That is, when the start switch of the nozzle unit 28 is operated,
The electric power is supplied to the ceramic heater 19, the valve unit 31 is opened, the heated hot water in the hot water storage tank 11 flows into the heating chamber 15, flows outside and inside the ceramic heater 19, and is further heated by the ceramic heater 19. Be done and take a bath. In this case, the hot water or water previously stored in the hot water outlet 22 is discharged from a water discharge hole (water discharge hole) through a separately provided drainage channel or in a state where the cleaning nozzle is not advanced, and is discarded in the toilet bowl 45. The temperature of the hot water passing through the hot water outlet chamber 23 is measured by a hot water outlet temperature sensor 34. When the temperature of the hot water passing through the hot water outlet chamber 23 reaches a constant hot water outlet set temperature, hot water is supplied to the nozzle portion 28.

Here, when the ceramic heater 19 is heated with a constant electric power, hot water is supplied to the nozzle portion 28 through the flow rate adjusting valve, so if the amount of hot water used in the sanitary washing device increases, the nozzle The temperature of the hot water ejected from the portion 28 decreases, and if the amount of water used in the sanitary washing device decreases, the temperature of the hot water ejected from the nozzle portion 28 rises. Therefore, depending on the amount of flowing water, the ceramic heater 19 Power control. That is, except for the first hot water supply state
The temperature of the flowing water is measured by the tap water temperature sensor 34, and if the temperature exceeds the set value, the ceramic heater 1
The electric power supplied to the ceramic heater 19 is increased when the electric power supplied to the ceramic heater 19 is smaller than the set value. Further, by providing a flow rate sensor in addition to the hot water temperature sensor 34 and monitoring the water temperature and the flow rate, the accuracy of controlling the hot water temperature can be improved. Note that these controls are performed within the rated value range of the ceramic heater 19.

That is, the heating control of the ceramic heater 19 is performed while satisfying the following expression (2). The hot water storage temperature in the hot water storage tank 11 is set to Twt (° C.), and the heating chamber 15
The outlet temperature of the outlet of the nozzle is set to Tout (° C), and the nozzle 28
When the discharge flow rate of the hot water from is Q (cc / min) and the power consumption of the ceramic heater 19 is W (watt), the equation (2) is satisfied, ignoring the heat loss. Tout = Twt + 14.3 · W / Q (2) When this equation (2) is modified to obtain Q, the equation (3) is obtained. Q = 14.3.W / (Tout-Twt) (3) Specifically, for example, the ceramic heater 19 has a rating of 8
Using a 00w heater, Tout 40 ° C, Twt 30
Q is 1144 (cc / min) at a temperature of ° C. Here, since the rating of the ceramic heater 19 is 800 w, water at 40 ° C. cannot be increased further,
In this case, it becomes possible by raising the set temperature Twt of the hot water in the hot water storage tank 11. If the amount of hot water is less than this, the water temperature T of the hot water storage tank 11
The wt can be made even lower.

Therefore, for the heating temperature (hot water storage temperature) Twt of the wash water 44 in the hot water storage tank 11, the maximum hot water discharge temperature at the outlet side of the heating chamber 15 is Tmax (° C.), and the maximum discharge rate of hot water is Q.
If the rated power consumption of the ceramic heater 19 is W (Watt), the following formula (4)
The condition is that the condition is satisfied, and if the condition is not satisfied, the amount of heat generated by the ceramic heater 19 is insufficient, and hot water at a predetermined temperature cannot be obtained. Twt ≧ Tmax −14.3 · W / Qmax (4) When hot water is continuously used, the temperature of the wash water 44 in the hot water storage tank 11 gradually decreases. Since the ceramic heater 19 of FIG.
Will be supplied with hot water. The hot water temperature is set by the setting device 4.
2 can be freely and manually adjusted by the hot water outlet temperature setting unit 40, and the amount of hot water from the nozzle unit 28 is controlled by controlling the opening of the flow rate adjusting valve with a switch in the setting device 42.

Next, the operation of the heat exchanger 10 of the sanitary washing device when the setting device 42 is set to the power saving mode will be described. In this case, the preheating temperature (hot water storage temperature, low temperature heating temperature) Twt of the wash water in the hot water storage tank 11 is set near the temperature represented by the following formula (5). Twt = Tmax-14.3 · W / Qmax (5) As a result, the temperature at which the wash water 44 in the hot water storage tank 11 is preheated becomes the smallest, and as a result, while maintaining the hot water discharge temperature, It can be operated with minimum power. As a special case, a temperature lower than the preheating temperature Twt (for example,
It can also be set to 18 ° C. or 15 ° C.). Although this further saves energy, the temperature supplied to the nozzle unit 28 is lowered. By setting a timer for a time period set to a temperature lower than the preheating temperature Twt to a time period not normally used by a person (for example, daytime or nighttime), power consumption is further reduced. Also, in power saving mode,
Finally, the amount of hot water supplied to the nozzle portion 28 can be reduced so that the temperature Twt of the hot water in the hot water storage tank 11 can be kept near the temperature determined by the equation (5).
In this case, the amount of hot water discharged from the nozzle portion 28 decreases, but the temperature can be secured.

When the seating detection sensor 43 is provided on the toilet seat, the power saving mode is set when the seating is not detected, and the seating detection sensor 43 detects the seating, whereby the power saving mode is released, and the non-power saving mode described above is set. You can also By this, electric power can be saved efficiently, but when the time from the seating detection to the use of the sanitary washing device is short, the heating by the ceramic heater 19 cannot be performed in time,
As a result, when a predetermined amount of hot water is flown from the nozzle portion 28, the hot water blown out from the nozzle portion 28 has a slightly lower temperature, and when the temperature is controlled to be constant, the amount of hot water is reduced. If the seating detection sensor 43 does not operate, the ceramic heater 19 may be de-energized. In this case, reliable power saving is possible. However, when the sanitary washing device is used immediately after sitting on the toilet seat, the washing water 44 in the hot water storage tank 11 is not sufficiently heated, so the nozzle portion 28 The temperature of the hot water that comes out of the machine will drop, or the amount of hot water will decrease. However, since most of the time, cleaning is usually performed after using the toilet, by setting the hot water storage temperature in the power saving mode so that the insufficient water temperature can be raised during the toilet, most of the above problems will occur. If you can avoid it.

If a temperature sensor is provided on or near the surface of the ceramic heater 19 to heat the wash water 44 in the hot water storage tank 11, the ceramic heater 19 will be used.
It is preferable to set the surface temperature of (1) or less to (the upper limit value of) the set temperature of the hot water blown out from the nozzle portion 28. As a result, the cleaning water 44 in the hot water storage tank 11 will not exceed the operating temperature and be set to a high temperature, so that careless discharge of hot water from the nozzle portion 28 can be reliably prevented.

Further, in the above-described embodiment, since the hot water storage tank 11 has a container shape, if preheated hot water in the hot water storage tank 11 is used, tap water is supplied from the inlet 13 of the hot water storage tank 11 accordingly. The temperature of the hot water storage tank 11 decreases as it enters and is stirred with the preheated wash water in the hot water storage tank 11.
It is also possible to appropriately provide a water passage in 1 so that the wash water that has entered from the inlet 13 gradually changes to the preheated hot water in the hot water storage tank 11. The heating chamber 15 has a bottomed cylindrical outer cylindrical body 16 and the hot water storage tank 1
Although it is divided into 1, the outer cylindrical body 16 may be provided with fins so that heat can be conducted more efficiently. Further, in the above-described embodiment, a heat insulating material may be arranged around the hot water storage tank to further enhance heat retention and improve thermal efficiency.

[0024]

In the heat exchanger of the sanitary washing device according to the first to thirteenth aspects, as is clear from the above description, the wash water in the hot water storage tank is lower than the temperature of hot water finally used. Therefore, the temperature difference with the outside becomes small, and the power consumption of the heater can be reduced. In addition, the hot water supplied from the hot water outlet is kept warm in the hot water storage tank by controlling the amount of heat generated by the heater, and is heated to the set hot water temperature before hot water is discharged. Can be supplied. Further, since the indirect heating of the hot water storage tank and the direct heating of the hot water discharged are performed by one heater, the device can be downsized and the number of parts can be reduced.

In particular, in the heat exchanger of the sanitary washing device according to the second aspect, since the heater of the heating chamber is a cylindrical ceramic heater and the washing water flows through the outside and the inside thereof, Heat exchange is efficiently performed. In the heat exchanger of the sanitary washing device according to claims 3 and 4, since the communication pipe is provided on the side wall or inside of the hot water storage tank, the temperature of the hot water up to the heating chamber can be made the same as that of the hot water storage tank. The set temperature can be reached in a short time. In the heat exchanger of the sanitary washing device according to claim 5, a hot water storage temperature sensor and a hot water discharge temperature sensor are provided on the outlet side of the hot water storage tank and the heating chamber, and the temperature of the wash water in the hot water storage tank and the outlet side of the heating chamber are provided by a heater. Therefore, the temperature of the wash water in the hot water storage tank and the temperature of the hot water discharged from the heating chamber can be accurately and efficiently controlled.

In the heat exchanger of the sanitary washing device according to the sixth aspect, since the temperature inside the hot water storage tank is set lower than the lower limit value of the set temperature at the outlet side of the heating chamber, the electric power for heating the hot water storage tank is supplied. In addition to being able to save efficiently, the tapping temperature can be controlled by heating over the entire set temperature on the outlet side of the heating chamber. In the heat exchanger of the sanitary washing device according to claim 7, the hot water storage temperature Twt (° C) in the hot water storage tank is the maximum hot water outlet temperature Tmax (° C) at the outlet side of the heating chamber, and the maximum discharge flow rate is Qmax (cc / cc / min) and the rated power consumption of the heater is W (watt), Twt ≧ Tmax −14.3
Since the formula of W / Qmax is satisfied, the low-temperature heated cleaning water in the hot water storage tank can be heated to ensure hot water of a predetermined set temperature.

In the heat exchanger of the sanitary washing device according to the eighth aspect, when the power saving mode is selected, the hot water storage temperature is controlled to be lower than in the case where the power saving mode is not selected, so that the temperature of the wash water in the hot water storage tank is further increased. It will be lower and further savings in power consumption will be possible. Further, in the heat exchanger of the sanitary washing device according to claim 9, since the power saving mode is canceled by the operation of the seating detection sensor, it is possible to automatically select the power saving mode and not to use the toilet bowl. Power savings are more efficient. The heat exchanger of the sanitary washing device according to claim 10 does not energize the heater in the heating chamber when the seating detection sensor does not detect seating when the power saving mode is selected. Therefore, when the toilet is not used, hot water is supplied. The heater does not consume electricity and is a reliable power saving device.

In the sanitary washing device according to the eleventh aspect, when the hot water is discharged from the sanitary washing device, the downstream hot water including the heating chamber is completely discharged, and then hot water suitable for use is newly discharged. Therefore, it is possible to reliably discharge appropriate hot water during use, and the sanitary washing device can be used with confidence. The heat exchanger of the sanitary washing device according to claim 12,
During the hot water heating control in the hot water storage tank, the surface temperature of the heater in the heating chamber is controlled below the upper limit of the set water temperature of hot water to be discharged, so the temperature of the wash water in the hot water storage tank may rise excessively. There is no hot water supplied as a result,
The sanitary washing device can be safely used without being heated further by a heater (heater) to form hot water. And
In the heat exchanger of the sanitary washing device according to the thirteenth aspect, since the heat insulating material is provided around the hot water storage tank, heat release from the hot water storage tank to the outside air can be suppressed, and energy can be saved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a heat exchanger of a sanitary washing device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of a toilet using the heat exchanger of the sanitary washing device.

FIG. 3 is a perspective view of a toilet bowl according to a conventional example.

FIG. 4 is an explanatory diagram of a heat exchanger of a sanitary washing device according to a conventional example.

FIG. 5 is a cross-sectional view of a heat exchanger of a sanitary washing device according to a conventional example.

[Explanation of symbols]

10: Heat exchanger of sanitary washing device, 11: Hot water storage tank, 1
3: Inlet port, 14: Outlet port, 15: Heating chamber, 16: Outer cylinder, 17: Inlet, 18: Communication pipe, 19: Ceramic heater, 20: Mounting flange, 21: Hot water outlet, 22: Hot water outlet, 23: Hot water room, 24: Water passage hole, 25: Vacuum breaker, 26: Hot water inlet, 27: Pipe fitting, 28: Nozzle part, 29: Hot water supply pipe, 30: Hot water outlet, 31: Valve unit, 32: Water level sensor , 33: Hot water temperature sensor, 3
4: Hot water temperature sensor, 35: Sanitary washing device, 36: Control unit, 37: Hot water temperature control unit, 38: Hot water storage temperature control unit, 40: Hot water temperature setting unit, 41: Power saving mode setting unit,
42: setting device, 43: seating detection sensor, 44: wash water, 45: toilet bowl

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Rinen Yanase             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. F term (reference) 2D038 JB03 JF03 JH02 KA03 KA15                       KA29

Claims (13)

[Claims] 1. A sanitary washing device attached to a toilet bowl for injecting warm water locally to wash, comprising an inlet for washing water,
A hot water storage tank provided with an outlet for discharging wash water heated at low temperature, and a hot water storage tank disposed at a lower position of the hot water storage tank,
The heating chamber is connected to the outlet through a communication pipe, and has a heating chamber substantially separated from the cleaning water in the hot water storage tank by a material having good thermal conductivity, and a heater arranged in the heating chamber. The washing water in the hot water storage tank is heated at a low temperature, and the washing water heated at a low temperature introduced from the outlet through the communication pipe at the time of tapping is further instantaneously heated to a predetermined temperature by the heater. Heat exchanger for sanitary washing equipment. 2. The heat exchanger of the sanitary washing device according to claim 1, wherein the heater is constituted by a cylindrical ceramic heater, and washing water heated inside and outside of the heater flows. Equipment heat exchanger. 3. The heat exchanger of the sanitary washing device according to claim 1, wherein the communication pipe is formed along a side wall of the hot water storage tank. 4. The heat exchanger of the sanitary washing device according to claim 1 or 2, wherein the communication pipe is provided inside the hot water storage tank. 5. The heat exchanger of the sanitary washing device according to any one of claims 1 to 4, wherein a hot water storage temperature sensor and a hot water discharge temperature sensor are provided on an outlet side of the hot water storage tank and the heating chamber, respectively. A heat exchanger of a sanitary washing device, wherein the temperature of the wash water in the hot water storage tank and the temperature of hot water at the outlet side of the heating chamber are controlled by controlling the heat generation amount of the heater. 6. The heat exchanger of the sanitary washing device according to claim 1, wherein the temperature in the hot water storage tank is set to a value equal to or lower than a lower limit value of a set temperature on the outlet side of the heating chamber. The heat exchanger of the sanitary washing device, which is characterized in that 7. The heat exchanger of the sanitary washing device according to claim 1, wherein a hot water storage temperature Twt (° C.) in the hot water storage tank is a maximum hot water discharge temperature on the outlet side of the heating chamber. Is Tmax (° C), and the maximum discharge flow rate is Qmax (cc /
min) and the rated power consumption of the heater is W (Watt), the heat exchanger of the sanitary washing device characterized by satisfying the following formula. Twt ≧ Tmax-14.3 · W / Qmax 8. The heat exchanger of the sanitary washing device according to claim 1, wherein the heat exchanger has a power saving mode for saving power consumption, and the power saving mode is not selected when the power saving mode is selected. A heat exchanger for a sanitary washing device, characterized in that the hot water storage temperature in the hot water storage tank is controlled to be lower than that in the above. 9. The heat exchanger of the sanitary washing device according to claim 8, further comprising a seating detection sensor that detects whether or not a person is sitting on the toilet seat, and the seating detection sensor detects the seating when the power saving mode is selected. A heat exchanger for a sanitary washing device characterized by releasing the power saving mode when detected. 10. The heat exchanger of the sanitary washing device according to claim 9, wherein when the seating detection sensor does not detect seating when the power saving mode is selected, the heater in the heating chamber is not energized to detect the seating. A heat exchanger for a sanitary washing device, wherein when a sensor detects seating, the heater in the heating chamber is energized to control the hot water storage temperature in the heating chamber. 11. The heat exchanger of the sanitary washing device according to claim 1, wherein after the hot water on the downstream side is completely discharged from the heating chamber to the outside of the sanitary washing device, the heat exchanger is directed toward the human body. Heat exchanger for sanitary washing equipment, which is characterized by discharging hot water. 12. The heat exchanger of the sanitary washing device according to claim 1, wherein the hot water whose surface temperature of the heater in the heating chamber is discharged during hot water heating control in the hot water storage tank. A heat exchanger for a sanitary washing device, which is controlled to be equal to or lower than the upper limit value of the set water temperature of. 13. The heat exchanger of the sanitary washing device according to claim 1, wherein a heat insulating material is provided around the hot water storage tank. .