JPH0585820B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] In order to always take out hot water heated by a heating device at a remote location, it is necessary to constantly circulate hot water using a circulation line. , hot water is taken out from the middle of the line. The present invention provides a hot water circulation device for thermally efficiently utilizing a hot water storage tank provided in a circulation line to withstand load fluctuations.

[Prior Art] A conventional hot water circulation system uses a hot water storage tank to withstand load fluctuations due to opening and closing of a hot water tap, and maintains the hot water in the hot water storage tank at a desired temperature throughout its entire capacity.

[Problem that the invention seeks to solve]

The total capacity of hot water in the hot water storage tank is large.
It was also necessary to increase the input power of the heating device so that hot water could quickly recover from a drop in hot water caused by a large load.

The present invention aims to save the capacity of the hot water storage tank and the input of the heating device by making the hot water in the hot water storage tank into two layers that do not mix with the low temperature water in the lower layer, and returning the circulating hot water to the high temperature water layer in the upper layer in the hot water storage tank. It is something to do.

[Means for solving problems]

The present invention includes a piston flow type hot water storage tank in which a low temperature water layer is formed at the bottom and a high temperature water layer at the top, and a heating line that heats the low temperature water from the bottom of the low temperature water layer and returns it to the top of the high temperature water layer. and a circulation line which leads the hot water from the upper part of the high temperature water layer and returns it to the upper high temperature water layer avoiding the low temperature water layer at the bottom of the hot water storage tank, and a circulation line having a hot water supply tap in the middle, and an external circuit at the bottom of the low temperature water layer. The system consists of a water supply line that supplies cold water from the circulation line, and openings are provided at multiple locations in the riser piping that exists in the hot water storage tank at the end of the circulation line, and each of the openings is opened by sensing the ambient temperature. This is a circulating hot water supply device characterized by being provided with a member.

[Effect]

At the beginning of the use of hot water supply using this circulation line, the entire capacity of the hot water storage tank is initially water, but the hot water is introduced from the bottom of the tank to a heating device and heated, and the hot water is injected from the top of the hot water storage tank. By using this hot water for hot water supply and gently returning the returned hot water to the hot water layer in the upper layer of the hot water storage tank, the hot water in the upper high temperature water layer and the low temperature water in the lower low temperature water layer in the hot water storage tank are not mixed. Then, hot water is circulated again from the upper high-temperature water layer for hot water supply.

Therefore, as the boundary between the high-temperature and low-temperature hot water layers in the hot water storage tank changes due to fluctuations in the amount of hot water used during hot water supply, it is necessary to ensure that the point where the return hot water is injected is always slightly above the boundary line. Therefore, the return hot water injection pipe is raised from the bottom of the hot water storage tank to near the top, openings are provided at multiple locations in the rising pipe, and each opening is equipped with a member that senses the ambient temperature and opens the opening. Determine the open position with
Returned hot water is injected into the hot water storage tank from the above-mentioned height position.

〔Example〕

Next, an embodiment of the circulating hot water supply device according to the present invention will be described in detail with reference to the drawings.

Cold water is supplied to the lower part of the hot water storage tank 1 through the water supply pipe 7, and heated by sending it from the lower part of the hot water storage tank 1 to the heating device 2 through the heating pipe 6 with the pump 4, and hot water is injected into the hot water storage tank 1 from the upper part, In a hot water supply system using a circulation line, the hot water at the top is circulated from the upper part of the hot water tank 1 through the hot water supply piping 8, the pump 4, the hot water supply piping 9, and the hot water is taken out from the middle through the hot water faucets 3, 3... The hot water heated in step 2 is injected from the top of the hot water storage tank 1, so inside the hot water storage tank 1 there is a high temperature water layer 10 at the top and a low temperature water layer 11 at the bottom, and these two layers move up and down depending on the amount of hot water taken out. Forms piston flow. In order to avoid mixing these two layers as much as possible, the return hot water of the circulation line is raised from the bottom of the hot water storage tank 1 at the tip of the hot water supply piping 9, and openings 14 are formed at multiple locations in the portion of the rising piping 5 that exists inside the hot water storage tank 1. Each of the openings 14 is provided with a member that senses the ambient temperature and opens the opening, such as a temperature sensing valve 1.
2 is installed, and the valve that senses the temperature of the high temperature water layer 10 is opened to always return the hot water into the high temperature water layer 10, thereby preventing the high temperature water from mixing with the low temperature water and returning the hot water to the hot water piping 8, 9. The water is circulated by a pump 4.

An embodiment of overflow portions provided at a plurality of locations on the above-mentioned rising pipe 5 will be described with reference to FIG.

At multiple locations above and below the rising piping 5,
A member installed at intervals that senses the ambient temperature and opens the opening 14, such as a temperature sensing valve 12.
A normal coil spring 16 and a shape memory alloy coil spring 15
are installed so that the shafts of the valve body 13 are pressed against each other,
When the ambient temperature is lower than a predetermined temperature, that is, the boundary temperature between the high temperature water layer 10 and the low temperature water layer 11, the coiled spring 16
The spring force of the shape memory alloy coiled spring 15 overcomes the spring force of the shape memory alloy coiled spring 15 and presses the valve body 13 against the opening 14.
is closed, and the return hot water does not flow out from the overflow port 14'. That is, high temperature returned hot water does not flow into the low temperature water layer 11 in the hot water storage tank 1. However, in the temperature sensing valve 12 located in the high temperature water layer 10, the shape memory alloy coiled spring 15 built into the valve returns to the pre-memorized shape due to the temperature of the high temperature water layer, and the spring force increases, causing the coiling. Since the spring force of the spring 16 is overcome, the valve body 1 of the temperature sensing valve 12 located in the high temperature water layer 10
3 leaves the opening 14, and the return hot water flows upward from the overflow port 14'. That is, the returned hot water flows into the high temperature water layer 10 without disturbing the piston flow in the hot water storage tank 1.
It overflows inside. Furthermore, in order to cause the overflowing return hot water of the temperature sensing valve 12 to flow out only from the temperature sensing valve slightly above the boundary between the two layers of piston flow, a weight piston 17 is provided in the riser pipe 5 so as to be movable up and down. This ensures that the boundary between the two layers of piston flow is maintained.

Next, as shown in FIG. 3, the ambient temperature is sensed and the opening 14 is opened.
Another embodiment of the member for opening a is shown in which a shape memory alloy plate 15' is used instead of the shape memory alloy coiled spring 15 shown in FIG. The aim is to open up

That is, at the bottom of the member 14b attached to make the surface of the opening 14a of the rising pipe 5 flat,
A shape memory alloy plate 15' having a rectangular plate shape sufficient to close this opening 14a and having a memorized posture as shown in the figure is attached, and an ordinary coil spring 16 is used to press the shape memory alloy plate 15' at the low temperature. opening 14a
The heavy piston 1 is placed above the opening 14a in the rising pipe 5 as shown in FIG.
Place 7.

〔Effect of the invention〕

As described above, the present invention supplies hot water through a circulation line, and a hot water storage tank provided in the flow path to cope with load fluctuations in hot water supply.
A piston flow type is used in which the high temperature water layer is the upper layer and the low temperature water layer is the lower layer. By overflowing the water slightly above the temperature boundary line, the piston flow is maintained stably, saving the capacity of the hot water storage tank and the input of the heating device.In addition, in recent years, heat pumps used in air conditioners have been used as a method for this heating device. However, in this case, the water sent from the hot water storage tank is always cold water, so the efficiency of the heat pump works advantageously, and the effects of the present invention are further enhanced.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of hot water supply in the implementation of the present invention,
FIG. 2 is a vertical cross-sectional view showing the structure of the overflow port of the return hot water, and FIG. 3 is a vertical cross-sectional view showing the structure of the overflow port of the return hot water in another form. 1... Hot water storage tank, 2... Heating device, 3... Hot water faucet, 4, 4'... Pump, 6, 7, 8, 9... Piping, 10... High temperature water layer, 11... Low temperature water layer , 12
...A member that senses the ambient temperature and opens the opening (temperature sensing valve), 13...Valve body, 14, 14a...
...opening, 14b... member, 15... shape memory alloy coiled spring, 15'... shape memory alloy plate, 16... coiled spring, 17... weight piston.

Claims (1)

[Scope of Claims] 1. A piston-flow type hot water storage tank in which a low-temperature water layer is formed at the bottom and a high-temperature water layer at the top; a heating line that brings hot water from the upper part of the high-temperature water layer, avoids the low-temperature water layer at the bottom of the hot water storage tank, and returns it to the upper high-temperature water layer, and has a hot water tap in the middle of the circulation line; It consists of a water supply line that supplies cold water from the outside to the lower part of the layer, and openings are provided at multiple locations in the rising piping that exists in the hot water storage tank at the end of the circulation line, and each of the openings senses the ambient temperature. A circulating water heater characterized by having a member for opening an opening.