JPH0531456Y2 - - Google Patents

Description

[Detailed description of the invention] (Application field and overview of the invention) The present invention relates to a high-temperature water supply device, and in particular, the invention relates to a high-temperature water supply device, and in particular, it reheats hot water supplied from an instantaneous water heater to a hot water storage tank.
It relates to a device that supplies high-temperature water to a specific location, and can be used in dishwashers, etc.

In addition, this invention increases the operating efficiency of the water heater when a stop-off water heater for preheating is used in the high-temperature water supply circuit, and also prevents the water hammer phenomenon every time the supply of high-temperature water is stopped. In order to prevent this from occurring, a combination of a float-type automatic water supply valve (ball tap) and a solenoid valve is used to control the supply of hot water to the reheating tank.

(Prior art and its problems) In a conventional dishwasher, as shown in Fig. 4,
The water supply circuit is configured such that the hot water supplied from the stop-start water heater 1 is heated to a predetermined temperature (82°C or higher) in the reheating tank 2.
The pump P supplies the heated water to the cleaning chamber 3 for a certain period of time.

In addition, with a normal stop-start type instantaneous water heater (hereinafter simply referred to as water heater 1), although it is not impossible to directly take out the above-mentioned high-temperature water, if you try to obtain hot water at this temperature, the amount of hot water supplied will be extremely high. water level has dropped to a low level, and a sufficient amount of hot water cannot be supplied to the cleaning equipment. Therefore,
After securing a certain amount of hot water, hot water with a temperature relatively close to the above-mentioned high temperature water is supplied from the water heater 1 to the reheating tank 2, and the hot water reheated in the reheating tank 2 is sent to the cleaning chamber 3.
We are trying to supply it to Even under the above conditions, the amount of hot water supplied from the water heater 1 is smaller than the amount of hot water supplied from the reheating tank 2, so the amount of hot water required for one cleaning is stored in the reheating tank 2 for several times. That's what I do.

Therefore, this conventional system has the advantage that the water heater 1 having a capacity that is normally installed in a kitchen can be used as is, without using a large-capacity water heater.

However, in this conventional system, the supply of hot water to the reheating tank 2 is controlled only by the so-called ball tap 11, so that the hot water supplied from the water heater 1 is often mixed with unheated cold water. This increases the capacity to be heated by the reheating tank 2, and there is a problem that sufficient high-temperature water cannot be obtained when high-temperature water is frequently supplied.

This is because, as the opening operation of the ball tap 11 is slow, there is a so-called inoperative state A in which the water heater does not perform any heating operation, as shown in Fig. 5, and cold water is not supplied during this period. It will become.

In other words, in a stop-start type water heater, a water pressure-responsive gas valve is inserted into the water circuit that passes through the heat exchanger, and when the flow rate of the water circuit reaches a constant flow rate, a gas burner that heats the heat exchanger is activated. The gas circuit to the water heater 1 is opened and the water heater 1 becomes operational. However, the valve body operates slowly when the ball tap 11 opens and closes, and the flow rate of the water circuit in the water heater 1 reaches the operating flow rate of the water pressure responsive gas valve after the ball tap 11 starts opening. It takes a certain amount of time to complete the process, and even when the valve is closed, there is a certain amount of time from when the flow rate decreases to the operating flow rate until the valve is completely closed. During this period, cold water is supplied directly from the water heater 1.

Normally, the above-mentioned water heater 1 has an after-boiling phenomenon, so the time when the water heater 1 is not in operation at the time when the ball tap 11 is closed is not a big problem. Due to this phenomenon (delay in heating to the desired temperature after the burner starts combustion), the ball tap 1
The amount of cold water supplied due to the delay in the operation of the water heater 1 at the initial stage of opening of the water heater 1 cannot be ignored.

In order to prevent such inconvenience, it is possible to control the hot water supply from the water heater 1 using a valve that opens and closes in synchronization with the high-temperature water supply operation, but in this case, especially when the hot water supply is stopped, Water hammer phenomenon becomes a problem.

(Technical Issues) The present invention aims to supply hot water from a stop-start type water heater 1 to a reheating tank 2, and then supply high-temperature water to the final hot-water supply section as needed. is set higher than the hot water supply capacity of the water heater 1, and
In a high-temperature water supply device in which the high-temperature water supply start timing and supply stop timing are controlled by a control means, the operation of the stop-start instant water heater is started early when hot water supply to the reheating tank 2 is started. The objective is to prevent the water hammer phenomenon when the hot water supply from the water heater 1 is stopped.

(Means) The technical means of the present invention taken to solve the above technical problem is as follows:
connected to the reheating tank 2 by both an auxiliary circuit 12 comprising a ball tap 11 housed in the reheating tank 2 and a main circuit 14 comprising a solenoid valve 13;
The control means is equipped with a control section that outputs a valve opening signal to the electromagnetic valve 13 when the high temperature water supply starts and outputs a valve close signal when the high temperature water supply stops, and the flow rate per unit time of the main circuit 14 is controlled. The amount of high-temperature water supplied per unit time was set slightly smaller.

(Operation) The above technical means of the present invention operates as follows.

The high temperature water heated by the reheating tank 2 is supplied to the final hot water supply section for a period of time controlled by the control means. At the start of high-temperature water supply, since the control means includes a control section that controls the solenoid valve 13, the solenoid valve 13 is opened by an output from the control section. The solenoid valve 13
Although the flow rate of the main circuit 14 including the water heater 1 is smaller than the amount of high-temperature water supplied, this flow rate is sufficient to put the water heater 1 into operation. Therefore, the water heater 1 becomes operational at the same time as the start of high-temperature water supply.

However, since the amount of hot water supplied from the water heater 1 to the reheating tank 2 under the above conditions is smaller than the amount of hot water supplied, at this time, the water level in the reheating tank 2 drops and the ball tap 11 opens. . Then, with both the ball tap 11 and the solenoid valve 13 open, an amount of hot water corresponding to the hot water supply capacity of the water heater 1 is supplied to the reheating tank 2. However, due to the insufficient capacity of the water heater 1, the reheating tank The water level inside 2 will gradually fall.

Thereafter, when the high-temperature water supply is stopped, the solenoid valve 13 is closed by the output from the control section at this time. Thereafter, hot water supply from the water heater 1 is controlled by the ball tap 11, and the hot water supply is stopped when the water level in the reheating tank 2 returns to the set water level. In other words,
By closing the ball tap 11, the hot water supply circuit 1
The circuit No. 0 is cut off, and hot water supply from the water heater 1 to the reheating tank 2 is stopped.

(Effects) Since the present invention has the above configuration, it has the following unique effects.

Since the non-operating time of the water heater 1 at the time when the supply of high temperature water is started is shortened, the amount of cold water mixed in from the water heater 1 to the reheating tank 2 is reduced, and the amount of cold water mixed in the reheating tank 2 is reduced.
The average temperature of the hot water supplied to the area increases.

Further, when the hot water supply from the water heater 1 to the reheating tank 2 is stopped, the hot water supply circuit 10 is cut off by the ball tap 11, so that no water hammer phenomenon occurs.

(Example) The example shown in Figs. 1 and 2 was implemented in a dishwasher, and the final hot water supply section was the washing chamber 3.
High-temperature water is supplied from the reheating tank 2 by a pump P to a shower head 31 provided in the washing chamber 3.

The operation time of this pump P is regulated to a fixed time by a timer T, and the operation timing of this pump is regulated by a timer T.
It is timed to the timing of the approach.

The reheating tank 2 is heated and heated by a gas burner B, and a ball tap 11 is installed in the upper part of the reheating tank 2. This ball tap 11 is installed at the downstream end of an auxiliary circuit 12 provided on the downstream side of the stop-start type water heater 1, and a solenoid valve 13 is inserted into a bypass circuit of this to form a main circuit 14.

The flow rate of this main circuit 14 is set to a predetermined value in advance, and is set to be slightly smaller than the amount of hot water supplied by the pump P. Therefore, under conditions where the amount of hot water supplied from the water heater 1 is smaller than the amount of high-temperature water supplied to the cleaning chamber 3, the solenoid valve 13 is initially opened (when the pump P is started).
In this case, the amount of hot water supplied from the water heater 1 becomes slightly smaller than the maximum value, and then reaches the maximum value by opening the ball tap 11, and after the pump P stops, the amount of hot water supplied from the water heater 1 becomes slightly smaller than the maximum value, and after the pump P stops, This results in a change in flow rate.

The capacity of the reheating tank 2 is set to be approximately the same as the amount of hot water supplied to the cleaning chamber 3 at one time as the final hot water supply section, and this point is similar to the conventional one.

The washer of the above embodiment is electrically constructed as shown in FIG. 2, with the pump P and the solenoid valve 13 both connected to the output contact t of the timer T. still,
The operation timing of this timer is set by a dish box detection switch 41 that detects when the dish box 4 is sent into the washing chamber 3. When the dish box detection switch 41 is turned on, the timer T is activated for the set time. The output contact t is closed.

The flow rate of the hot water supply circuit 10 and the main circuit 14 is set to a value that almost matches the amount of suction by the pump P, and a timer is separately provided to control the opening time of the solenoid valve 13. When set to be slightly shorter than the operating time of the pump P, the flow rate changes through the hot water supply circuit 10 will be as shown in Fig. 3, and the change will correspond to the valve opening operation of the ball tap 11 before and after the ball tap 11 is opened and closed. This results in a slow flow rate change.

Before the solenoid valve 13 opens, the ball tap 11 opens and hot water is supplied to the reheating tank 2. After that, the solenoid valve 13 is opened by a separately provided timer, and the amount of water supplied by the pump P is approximately the same. This is because hot water is supplied to the reheating tank 2, and after the solenoid valve 13 is closed by the timer, the water supply from the water heater 1 is stopped by the ball tap 11 after the pump P is stopped. .

In this case, it is necessary to make the water heater 1 a large-capacity water heater, or to supply relatively low-temperature hot water to the reheating tank 2 to set a large amount of heating in the reheating tank 2.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the main part thereof, Fig. 3 is a graph showing flow rate changes in the hot water supply circuit 10 of this embodiment, and Fig. 4 is a conventional example. The explanatory diagram of FIG. 5 shows the flow rate change of the hot water supply circuit in this case. In the diagram: 1... water heater, 10... hot water supply circuit, 11... ball tap, 12... auxiliary circuit, 13... solenoid valve, 14... main circuit, 2... reheating tank.

Claims (1)

[Scope of utility model registration request] Hot water from the stop-start type water heater 1 is supplied to the reheating tank 2, and high-temperature water is then supplied to the final hot-water supply section as needed, so that the high-temperature water supply capacity exceeds the hot-water supply capacity of the water heater 1. In the high-temperature water supply device, the hot water supply circuit 10 of the water heater 1 is connected to a ball tap housed in the reheating tank 2. It is connected to the reheating tank 2 by both an auxiliary circuit 12 comprising a solenoid valve 11 and a main circuit 14 comprising a solenoid valve 13, and outputs a valve opening signal to the solenoid valve 13 when the supply of high-temperature water is started. The control means is equipped with a control unit that outputs a valve closing signal when the high-temperature water supply is stopped, and the flow rate per unit time of the main circuit 14 is set to be slightly smaller than the high-temperature water supply amount per unit time. Device.