JPS6231232B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water/cold water mixing type hot water supply device for supplying hot water by mixing hot water and water to a predetermined temperature.

Conventional configuration and problems thereof Conventionally, this type of hot water mixing type water heater has been configured as shown in FIGS. 1 and 2. That is, in FIG. 1, water supplied from a water supply 1 is heated by a heater 3 in an electric water heater 2, which is a hot water supply heat source, and is stored in a tank 4. A hot water supply pipe 5 is connected to the electric water heater 2, and manual hot water mixing taps 6 and 7 are provided at the ends of the hot water supply pipe 5 as hot water taps. These hot and cold water mixing faucets 6 and 7 have hot water supply branch pipes 8 and 9 branched from the hot water supply pipe, respectively, and water supply branch pipes 11 and 12 connected to a water supply pipe 10 branched from the water supply pipe 1 in front of the electric water heater 2. It is connected. When the hot water mixing faucet 6 or 7 is opened, the high temperature hot water stored in the tank 4 in the electric water heater 2 is pushed by the water pressure of the water supply 1 and flows through the hot water supply pipe 5 to the hot water mixing faucet 6 or 7. reach Here, the hot water is mixed with water from the water supply pipes, cooled down to a temperature suitable for use, and then supplied. Figure 2 shows a hot water mixing faucet 6 or 7, and the main body 1
3 has a hot water inlet 14 and a water inlet 15,
The opening degree of the hot water flow path 16 and the water flow path 17 is adjusted by means of a slit 18 provided in the valve body 19. The valve body 19 operates to slide vertically in the figure, and is driven by a wax pellet 20 that also serves as a mixed water temperature detection means, and a temperature control knob 2.
When the temperature of the mixed water rises above the mixing temperature set in step 1, the wax pellet 20 expands and moves the valve body 19 upward, and when it decreases, it moves downward to adjust the opening degree of the flow path. The mixed hot water is supplied to the object of hot water supply through the mixed hot water channel 22 or 22', for example, by opening and closing a hot water tap 23 for a bath or a hot water tap 24 for a shower. When both the hot water taps 23 and 24 are closed and hot water supply stops, the water temperature decreases due to natural heat radiation, so the wax pellet 20 contracts and the valve body 19 is pushed by the spring 25 and moves downward, opening the flow path on the water side. 17 is gradually narrowed down by slit 18.

When the hot water has completely cooled down, the water side flow path 17 is completely closed and the hot water side flow path 16 is fully opened. In this conventional example, the valve body is driven by a wax pellet that also serves as a mixed water temperature detection means, but recently there has also been a method in which the valve body is driven by a motor and the mixed water temperature is detected and controlled by a thermistor. However, as the hot water cools after hot water supply is stopped, the phenomenon in which the valve element opens the hot water side flow path and closes the water side flow path occurs similarly to the wax pellet type. It was on.

Since this type of conventional hot water mixing device was constructed as described above, it had the following drawbacks.

(1) The valve body closes the water side flow path and opens the hot water side flow path due to natural heat radiation cooling after hot water is used.
When the hot water supply is restarted, hot water higher than the set value will be supplied and there is a risk of burns. Especially after other nearby hot and cold mixer taps have been used, or in a circulating hot water system,
Furthermore, in cases where the hot water supply piping distance to the hot water supply heat source is short, very hot water may come out, which is dangerous, because less heat is absorbed by the hot water supply piping.

(2) Since temperature control always starts with the hot water side flow path open and the water side flow path closed, it takes time to reach the set temperature.

(3) When the driving means is electrical, electricity is supplied to move the valve body even during cooling after hot water supply is stopped, which goes against energy conservation.

Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional hot water mixing type hot water supply device as described above, and the purpose of the present invention is to stop the drive device after the hot water supply is stopped, and to stop the valve body at the position before the hot water supply is stopped. That is.

Structure of the Invention In order to achieve this object, the present invention includes a driving device such as a motor that drives a mixing valve body, a temperature sensor that detects the temperature of mixed water, and a drive device that compares the signal of the temperature sensor with a set value. A controller that controls the device, an on-off valve that stops the supply of mixed hot water, and a flow detector that directly or indirectly detects the supply status of mixed hot water are installed. When the supply of water stops, the drive device is stopped, and when the supply starts, the drive device is restarted. This prevents hot water from coming out when hot water supply is restarted, and it takes less time to reach the target temperature, thereby saving energy.

DESCRIPTION OF EMBODIMENTS Next, an embodiment of the present invention will be described based on FIGS. 3 and 4. In Figure 3, water supply 31
The supplied water is heated by a heater 33 in an electric water heater 32, which is a hot water supply heat source, and then transferred to a tank 34.
stored within. Electric water heater 32 has hot water pipe 3
5 is connected to this terminal side, and a hot water mixing device 36, 36' and a hot water tap 37, 3 which is an on-off valve are connected to this terminal side.
7' is provided. To explain the hot water mixing device 36 as a representative example, in FIG.
Valve bodies 44 and 45 for adjusting the opening degrees of the hot water side flow path 42 and the water side flow path 43 are provided in a mixing valve frame 41 having an outlet 9 and a mixed hot water outlet 40.

The water side valve body 45 has a piston 46 for pressure balancing, and although not shown in the drawing, the pressure in the mixing chamber 47 is guided to a chamber 48 on the back side of the piston 46. The valve bodies 44 and 45 have shafts 4
9 passes through the shaft 49, and the valve bodies 44, 45 can slide on the shaft 49.

The valve bodies 44, 45 are urged outward by a spring 50, and their outermost ends are regulated by stop shafts 51, 52 provided on the shafts. The shaft 49 is driven by a motor 53, which is an electrical drive device, via a conversion device 54 provided outside the valve body 41 that converts rotation into sliding. The mixed water temperature is detected by a thermistor 55 which is a temperature detector, and is detected by a controller 56.
The signals of the thermistor 55 and temperature detector 57 are compared, and the amount of drive of the valve bodies 44, 45 by the motor 53 is determined and controlled according to the deviation. A flow switch 59 is provided in the mixing flow path 58 as a flow detector that directly detects the supply state of mixed hot water. is started and stopped.

Next, the operation will be explained. A state in which hot water is supplied by opening and closing the hot water tap 37 is defined. electric water heater 3
The hot water in 2 is sent to a hot water mixing device 36 through a hot water supply pipe 35 at tap pressure. To the hot water mixing device 36,
Water sent through the water supply pipes is also introduced. The hot water and water coming in from the hot water inlet 38 and the water inlet 39 are connected to the hot water and water flow path 42 by the valve bodies 44 and 45.
The opening degree of 43 is adjusted, and each flow rate is determined. The valve bodies 44 and 45 are controlled by a signal deviation from a thermistor 55 and a temperature detector 57, and when the mixed hot water temperature detected by the thermistor 55 is higher than the set value, the motor 53 is driven via the controller 56. Push the shaft 49 to the right via the converter 54. The valve bodies 44 and 45 are thereby moved in parallel, and the valve body 44
moves in the direction to close the hot water side flow path 42, and the valve body 46 moves in the direction to open the water side flow path. If the mixed hot water temperature is lower than the set value, the valve bodies 44 and 45 will move and open the hot water side flow path 42.
is opened, and the water side channel 43 is closed. While hot water is being supplied, since there is a flow in the mixing channel 58, the flow switch 59 remains on to ensure that the motor 53 is energized. During hot water supply, if the flow rate changes due to fluctuations in hot water or water pressure, the mixed water temperature will change as a result, but the thermistor 55 and the controller control the motor 5.
3, and the valve bodies 44 and 45 are driven so as to return to the original set value.

Since hot water supply becomes unnecessary and the flow stops when the hot water tap 37 is closed, the flow switch 59 is turned off and at least the power to the motor 53 is cut off. Thermistor 5
Even if the water temperature around 5 falls due to natural heat radiation,
Since the motor 53 does not move, the valve bodies 44 and 45 face the position immediately before hot water supply is stopped, without consuming power unlike the conventional system. Next, it is assumed that hot water supply becomes necessary again and the hot water tap 37 is closed. Since the valve bodies 44 and 45 are in the position when the hot water supply was stopped last time, even if hot water flows in from the hot water side flow path 42, the previous hot water temperature setting does not indicate the maximum hot water temperature. As far as possible, the hot water side flow path 42 is in a constricted state, and mixed hot water equal to or lower than the previous time is supplied. In addition, even if the temperature setting is changed from the previous hot water supply to a higher or lower temperature, the valve bodies 44 and 45 do not have to start controlling the flow path to open and close the flow path from the fully open state of the hot water side, as in the conventional case. .

Normally, the temperature at which hot water comes out varies depending on the season and where it is used, such as the bath or kitchen. There are many cases where this happens.

In this embodiment, the flow of mixed hot water accompanying the opening and closing of the hot water tap 37 is directly detected by the flow rate switch 59 to start or stop driving the motor 53. It has an effect that can be controlled just by operation. In addition to flow switches, flow detectors that detect the supply status of mixed hot water include, for example, indirect sensors that are integrated with hot water taps, turn the switch on and off in conjunction with the hot water tap operation, and transmit this on/off signal to the controller via electric wires. Possible methods include a method that uses a pressure switch to pick up pressure fluctuations caused by opening and closing the hot water tap.

As described above, the present invention stops the driving of the valve body by the drive device when the hot water supply is stopped, and maintains the flow path opening on the hot water side and the water side at the position when the hot water supply is stopped. It has a great effect.

Effects of the invention (1) When hot water supply is restarted, hot water higher than the set value is supplied as in the past, and it is safe to avoid burns.

(2) The control at the start of use does not always start with the hot water side flow path fully open, but starts from the previously set hot water temperature position, so the set temperature can be reached quickly.

(3) Since the driving means does not need to drive the valve body after hot water supply is stopped, there is no wasteful energy consumption such as electric power consumption, and energy saving can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional hot water mixing type water heater, Fig. 2 is a sectional view of a conventional hot water mixing type water heater used in the same device, and Fig. 3 is an implementation of the hot water mixing type water heater of the present invention. FIG. 4, a system diagram showing an example, is a sectional view of a hot water mixing device used in a hot water mixing hot water supply device according to an embodiment of the present invention. 38...Hot water inlet, 39...Water inlet, 40...
...Mixing hot water outlet, 41...Mixing valve frame, 42...Hot water side flow path, 43...Water side flow path, 44, 45...Valve body (mixing valve body), 53...Motor (drive device) , 55
... thermistor (temperature detector), 56 ... controller, 59 ... flow rate switch (flow detector).

Claims (1)

[Scope of Claims] 1. A valve body having an inlet for hot water and an outlet for mixed hot water, and a mixing valve body that adjusts the opening degree of a hot water side flow path and a water side flow path in this valve body, A driving device such as a motor that drives the mixing valve body, a temperature detector that detects the temperature of the mixed water, a flow detector that detects whether the mixed water is being supplied, and a detection value of the temperature sensor that detects the temperature of the mixed water. The drive device is controlled so that the set value is achieved, and when the flow detector detects the supply of mixed hot water, the drive device is activated, and when the flow detector detects the supply of mixed hot water is stopped, the drive device is activated. A hot water mixing type water heater equipped with a control unit that stops the water. 2. The hot water mixing type water heater according to claim 1, wherein the flow detector includes a flow switch.