JPS58123032A - Circulation type hot water feeder - Google Patents

Abstract

PURPOSE:To use a small diameter pipe and realize the reduction in cost by a method wherein a hot water feeding pipe and a hot water return pipe in a hot water circulation piping passage are connected through a bypass pipe and a passage change-over valve, and the passage change-over valve is controlled in repsonse to an existence or non-existence of a difference in the rate of flow in the hot water feeding pipe and the hot water return pipe. CONSTITUTION:The water in a heater 12 fed from a cistarn 11 is heated by a burner and becomes a hot water and then it is circulated under an operation of the circulation pump 18 through a feeding pipe 14, a circulation pipe system including a return pipe 15. During a circulation of this hot water, when hot water faucets 16 and 17 are opened, the hot water is instantly fed out. With the above arrangement, the feeding pipe 14 and the return pipe 15 are connected by a bypass pipe 20 through a passage change-over valve 19. The passage change-over valve 19 is controlled by a flow rate difference sensor means 23 including the flow sensors 21 and 22 arranged in each of the pipes 14 and 15. That is, in case of having a difference in flow rate the change-over valve 19 is changed over to the bypass pipe 20, and the hot water is fed through both pipes 14 and 15, in turn when no flow rate difference is found, the change-over valve 19 is controlled to be changed over to the piping passage.

Description

[Detailed description of the invention] The present invention has a hot water supply pipe and a return pipe, and a circulating pump circulates hot water from a heat source device, making it possible to immediately supply hot water when a hot water tap is opened. The present invention relates to a method of controlling a circulating water heater.

A conventional circulating water heater of this type was constructed as shown in FIG. That is, the boiler 1 is connected to a hot water feed pipe 2 and a hot water return pipe 3, and the hot water feed pipe W2 is provided with hot water taps 4 and 5. A circulation pump 6 is inserted into the hot water return pipe 3 to circulate hot water to the hot water feed pipe 2 and the hot water return pipe 3 of the boiler 1. This circulation pump 6.

Since it is provided for the purpose of dissipating and supplementing the heat from the hot water feed pipe 2 and the hot water return pipe 3, it is attached to the hot water return pipe 3 so as not to cause resistance during hot water supply. 7 is Jistan,
Normally, a little warm water is circulated by the circulation pump 6, but when the hot water taps 4 and 5 are opened.

Hot water is supplied to hot water tap 4 or 6 depending on the water head pressure of DiStern 7.
hot water is supplied. Regarding control, since the circulation hot water system was originally intended for large-scale equipment, no special consideration was given to it, and the circulation pump 6 was turned on and off with a manual switch 8, 2 and hot water was normally constantly circulating.

Since this conventional circulating hot water supply apparatus is constructed as described above, it has the following drawbacks.

(1) To supply hot water to the hot water taps 4 and 5, only the water speed pipe 2 passes through, so the hot water feed pipe 2 needs to be thick enough to match the hot water supply 1, and the hot water return pipe 3 also feeds hot water. Since piping with the same diameter as pipe 2 was normally used, the entire piping space was required to be long, and there was a problem with just one turn in height.

(2) Since the pipe diameter is large, the area in contact with the surrounding air is also large, and the amount of heat dissipated during hot water circulation is large. In particular, the heat dissipation needle was extremely large because hot water was constantly circulated and preheated so that it could be used at any time.

The present invention solves the drawbacks of the conventional circulating water heater, and provides a circulating water heater that reduces piping space and heat loss from the piping route, and that is rationally controlled. The purpose is to

In order to achieve this object, the present invention provides a bypass pipe that connects the hot water feed pipe and the hot water return pipe, and a route switching valve that selects the piping route side and the bypass pipe [111J]. Detects the flow meter difference between the pipes and switches the route switching valve to the piping route side when there is no flow meter difference, allowing full circulation of hot water from the hot water sending pipe to the hot water return pipe, and switching to the bypass pipe side when there is a flow meter difference. Hot water is supplied through both the hot water supply pipe and the hot water return pipe.An enemy detection means is installed near the route switching valve, and the pipe diameters of the hot water supply pipe and water return pipe are reduced, and special wiring work is carried out. The present invention provides a circulating hot water supply device that does not require the above steps. Next, one embodiment of the present invention will be described with reference to FIG.

In the first factor, the water supply means 11 and the boiler 12 which is a heat source for heating water are connected by a water supply pipe 13. A thin hot water feed pipe 14 and a hot water return pipe 15 are connected to the boiler 12 to form a piping route. And hot water feed pipe 14 and hot water return pipe 1
A hot water supply pipe 14 is provided with a circulation pump 18 for circulating hot water. What are the hot water feed pipe 14 and the hot water return pipe 16?

They are connected via a bypass pipe 20 via a route switching valve 19'fr, and the circulation pump 18 is connected to a connection part 20' of the bypass pipe 19.
connected to the upstream side of the The path switching valve 19 is controlled by a flowmeter difference detection means 23 including a flowmeter sensor [21] provided on the hot water feed pipe 14 and a flowmeter sensor [22i] provided on the hot water return pipe 16. The flow meter detection means 23 has a built-in electric circuit that calculates the flow difference between the flow meter sensor 121 and the flow sensor [22], and is also connected to a thermometer 24 that detects the temperature of the piping route. The circulation pump 18 is controlled by sharing the gold. The route switching valve 19 is @
When circulating water, the piping route side is selected, and the hot water is circulated from the boiler 12 to the boiler 12 again through a hot water feed pipe 14 and a hot water return pipe 16 using a circulation pump 18. Also, during hot water supply, the route switching valve 19 is switched to the bypass pipe 2o.
Depending on which side is selected, the hot water is led to the hot water tap 16 or the hot water tap 17 through the hot water feed pipe 14 and the hot water return pipe 16.

Hot water is supplied under pressure by the circulation pump 18. This control is performed by flowmeter sensor summer 21 and flowmeter sensor [12
This is done by one difference between two flows.

Next, the operation of this actual m1MJ will be explained.

First, it is assumed that the hot water taps 16 and 17 are closed and the temperature of the piping path is low. The thermostat 24 detects the temperature and first starts the circulation pump 18. Then, the flow meter sensor 21.1122 operates during a predetermined period of time and detects the flow meter difference between the hot water feed pipe 21 and the hot water return V pipe 22. In this case, since the hot water taps 16 and 17 are closed, there is no flow meter difference, so the path switching valve 19 continues to select the piping path side, and the hot water from the boiler 12 flows in the direction indicated by the solid line arrow in Figure 1 at a small flow rate. When the temperature of the piping route rises, the thermometer 24 detects this and stops the circulation pump 18. Below, when the temperature of the piping route falls, the circulation pump 18 starts, and when the temperature rises, the circulation pump 18 stops. The operation of the pump 18 is repeatedly stopped.

Next, with the circulation pump 18 stopped, the hot water tap 16.
Alternatively, suppose you open any one of the 17. Normal time,
Since the route switching valve 19 selects the piping route 1llO, hot water first passes through the hot water feed pipe 14 and flows out of the hot water tap 16 or 17 due to the water head pressure of the distiller 11, but the flow 1 sensor 121 and the flow meter sensor [ 22, the path switching valve 19 is activated by the flow rate difference detection means 23. .

Hot water is supplied to the hot water tap 16 or 17 through both the water speed pipe 14 and the hot water return pipe 16. During hot water supply, the i quantity sensor [21 is in the positive direction.

Because hot water flows in the opposite direction to the flowmeter sensor ■22,
The path switching valve 19 maintains selection of the bypass pipe side. When all the hot water taps 16 or 17 are closed.

The flow of hot water feed pipes 14 and 15 is stopped, and the flow meter sensor 1
Since there is no difference between the flow rate sensor 21 and the flow rate sensor [22, the route switching valve 19 selects the piping route side.
By opening 6 or 17, the hot water feed pipe 14
Since there is a difference in R and amount of the hot water return pipe 16, the path switching valve 19 selects the bypass pipe 2oIIIl of the hot water supply pipe 14. In this embodiment, the circulation pump 18 is switched to the bypass pipe 2o Because it is provided upstream of the connecting portion 20', hot water can be supplied to the hot water taps 16, 17 in a pressurized state, thereby eliminating dissatisfaction such as insufficient water pressure.

The present invention includes a bypass pipe and a route switching valve that connect a hot water sending pipe and a hot water return pipe, and the route switching valve is controlled by a flowmeter difference detection means that detects a difference in flow rate between the hot water sending pipe and the hot water return pipe.
When hot water is being circulated, a circulation pump is used to circulate all of the machine's hot water from the hot water sending pipe to the hot water return pipe, and when hot water is being supplied, hot water is supplied to the hot water tap through both the hot water sending pipe and the hot water return pipe. It has the following effects: (1) Hot water is supplied to the hot water faucet through both the hot water supply pipe and the hot water return pipe, and during circulation, a small flow of hot water from the hot water supply pipe to the hot water return pipe is circulated. @Water speed pipe and @Water return pipe have small diameters, requiring less piping space and can be provided at low cost.

(2) Since both the hot water sending pipe and the hot water return pipe can be of small diameter, the area of contact with the surrounding air is reduced, and in particular, the heat radiation during circulation, which has been a problem in the past, can be greatly reduced.

(3) Since the route switching valve is controlled by a flow rate detection means that detects the difference in flow rate between the hot water supply pipe and the hot water return pipe, it is necessary to install an operation switch near each hot water tap or perform electrical wiring work to supply hot water. There is no need to connect wires from the stopper side to the route switching valve.

[Brief explanation of drawings]

FIG. 1 shows a system 4 configuration showing one embodiment of the present invention. 2A and 2B are system 4 configuration diagrams showing a conventional circulating hot water supply device. 11... Distarne (water supply means), 12・ee
... Boiler (heat source machine), 14 ... Hot water feed pipe, 15 ... Hot water return pipe, 16.17 ...
...Hot water tap, 18-@...Circulation pump, 19...0
...Route switching valve, 2Q e＊＊＊＊＊Bypass pipe, 2Q
'mm**2m connection part, 23...Flow rate difference detection means.

Claims (1)

[Claims] (1) It has a water supply means, a heat source device that heats water, a piping route consisting of a hot water transmission pipe and a hot water return pipe connected to the heat source equipment, and a hot water tap and hot water circulation pump installed in the piping route. In the circulating hot water supply device which circulates hot water from the heat source device to the piping route using the hot water circulation pump to preheat the piping route, a bypass pipe is provided to connect the hot water sending pipe and the hot water return pipe of the piping route, Equipped with a #8 switching valve that selects between the piping route side and the bypass pipe side, detects a flow rate difference of 1 between the hot water sending pipe and the leakage return pipe, and switches the route switching valve to the piping route side when there is no difference in flow rate. A path switching valve is used to detect flow rate difference, which circulates hot water from the hot water sending pipe to the hot water return pipe, and when there is a difference in flow rate, switches to the bypass pipe side and supplies hot water through both the hot water sending pipe and the hot water return pipe. Circulation type (2) characterized in that the circulation pump is provided in the vicinity of the bypass pipe connection part of the hot water feed pipe, and the circulation pump is controlled by the flow rate difference detection means. A circulating water heater according to claim 1.