JPS5932735A - Hot water supply device - Google Patents

Abstract

PURPOSE:To enable to supply hot water with stable temperature by a method wherein the capacity to supply hot water is made variable with a wide range from high output to low output without adjusting the burning rate of a burner over a wide range. CONSTITUTION:When the hot water supply load (q) calculated from the data given by a feed water temperature sensor 13, a flow rate sensor 14, and a temperature setter 15 is Q/2 (where Q is the output of the burner) or less, a part of the water in the feed water pipe 1 is circulated through a first check valve 2 in a closed circuit composed of a main heat exchanger 4 the tank 5a of an indirect heat exchanger 5 a circulating pump 8 a second check valve 9 the main heat exchanger 4 in order to be heated by the burner 3. On the other hand, the major part of the water in the feed water pipe 1 is past through a branch feed water pipe 1' and heat-exchanged at the coil 5b of the indirect heat exchanger 5 and then sent through a three-way valve 7 and a feed water pipe 11 to a place to be used. Because the burner is operated at the output of Q/2 and at the same time turned ON and OFF in response to the temperature detected by a detector 15, the rate of heat exchange at the coil 5b is in the range Q/2- Q/10, resulting in enabling to sufficiently cope with the required set temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a so-called instantaneous hot water supply device that can adjust the hot water supply capacity over a wide range depending on the hot water supply load.

Main) Background technology Conventionally, this type of water heater has a gas-fired type with a power consumption of 100 to 2
A system has been developed that controls burner combustion within a range of 0% and proportionally controls the hot water supply capacity according to the load. This proportional control type has the advantage that it saves the effort of mixing hot water and water, and the S temperature remains almost the same even if the hot water supply is changed. However, in the case of kerosene-broiled products, the combustion rate of the burner can only be adjusted from 100% to 50% at present, and a proportional control type that can be controlled over a wide range has yet to be developed. -fe, domestic hot water supply is 50.
000 KcaI/h is required, but in the case of reheating hot water from a solar water heater, 5,000 Kcal/h is sufficient, and in order to save the trouble of mixing hot water, a wide range of V'C hot water supply is possible even for kerosene-fired water heaters. Something that could adjust its abilities was desired.

(c) Purpose of the Invention The present invention was made in view of the above-mentioned facts.
The purpose is to make hot water supply at a stable hot water temperature by making the heating capacity variable over a wide range from high output to low output without adjusting the combustion chamber of a burner over a wide range.

B) Embodiment of the Invention An embodiment of the present invention will be described below as shown in the drawings. In the diagram, is the water supply pipe (1) the first check valve (2)? The water supply of the main heat converter (4) is directly heated by the burner (3) through the water supply [T1 (4a)]. Main heat converter (4
The hot water outlet (4b) of the
It is connected to the inlet (7a). The water supply pipe (11) is branched upstream of the first check valve (2), and the branch water supply pipe (1) is connected to a coil (as a secondary circuit) inserted into the tank (5a) of the indirect heat exchanger (5). The tank (5a) of the indirect heat exchanger (5) and the first inlet (7a) of the three-way valve (7) are connected to the second inlet 1j (7b) of the three-way valve (7) via the and the water supply inlet (4a) of the main heat converter (4) are connected by a connecting pipe tl[1lVC, with a circulation pump (8) and a second check valve (9) interposed therebetween. The outlet (7C) of the three-way valve (7) is connected to a hot water pipe I that supplies hot water to a usage section (not shown).

A is a control 1] device that manually inputs signals from the water supply temperature detector 031 installed upstream of the branch port of the water supply pipe (1), the spill detector 041, and the temperature setting device (151). , calculate the hot water supply load q, and compare the hot water supply load q with the burner output Q (maximum output) using the following equation.

q＞Q/2 −・・・・■ q＜Q/2 −−・・・・■ When the following equation is established, the first inlet (7a) - outlet of the three-way valve (7) (7C) are communicated with each other (circulation pump (8) is stopped). In addition, the water temperature at the tank outlet of the indirect heat exchanger (5) is detected by the hot water temperature detector u51, and the detection 2
Compare the detected temperature in step 9 with the set temperature of the temperature setting device, and if the detected temperature is lower than the set temperature, turn off the burner (3).
is operated with strong combustion (Q), and when the detected temperature exceeds the set temperature, it is operated with weak combustion (Q/2).

On the other hand, when the formula 0 is established, the control device 03 establishes three-way communication and operates the operating pump (8).

In addition, the circulating hot water temperature necessary to maintain the hot water temperature at the set temperature is determined from the water temperature and flow rate of the detector αa+ (141) and the set temperature of the temperature setting device +151, and the temperature of the circulating hot water necessary to maintain the hot water temperature at the set temperature is determined by In order to match the detected temperatures of the two combustion engines, the combustion mode is set to low combustion (Q/2) and on/off control is performed.

According to this embodiment, when the hot water supply load q exceeds the output Q/2, the water supplied from the water supply pipe (1) is transferred from the first check valve (2) to the water supply. Inlet (4a) → Main heat exchanger (
4) - Hot water supply outlet (4b) - Tank (-next circuit) (5a,) of the indirect heat exchanger (5) - First inlet of the three-way valve (7) (
Flows through the path between 7a) - Outlet (7C) - Hot water supply pipe υ,
The main heat converter (4) receives combustion heat from the burner (3) and is heated. In bar J''' (3), the burner output is adjusted alternately to Q and Q/2 so that the temperature detected by detector 4 becomes the set temperature, and hot water maintained at almost the set temperature is continuously supplied from the hot water pipe αυ. and be supplied at ℃.

On the other hand, when q is less than or equal to Q/2, part of the water in the water supply pipe (11) passes through the first check valve (2) and enters the main heat converter (4) from the water supply inlet (4a); By operating the circulation pump (8), the main heat converter (4) → the indirect heat exchanger (5) tank (-
Next circuit) (5a) - Circulation pump (8) - Second check valve (9
) - It is circulated in the closed circuit of the main heat converter (4), and as it passes through the main heat converter (4), it receives the combustion heat of the burner (3) and is heated 6
It will be done. Since the three-way valve (7) communicates between the second inlet (7b) and outlet (7C), most of the water in the water supply pipe (1) passes through the branch water supply pipe (1) and is heated indirectly. Coil (secondary circuit) (5b) inserted into the tank (5a) of replacement-(5)
), where it is indirectly heat-converted with the hot water in the tank (5), heated, and then sent to the usage area through the three-way valve (7) and the hot water supply pipe.At this time, the burner (3) ) is operated at an output of Q/2, and the burner (3) is turned on and off at the same time as L8 at 151 OJ detection f: +? coil (5b
) heat exchange 1 is in the range of Q/2 to Q/10, which means that the set temperature (55 to 55° C. at low load), which is lowered, can be adequately handled by VC. When the burner (3) is turned on and off, the hot water temperature If in the υ tank (5a) changes, but because there is a delay in heat transfer to the coil (5b), the hot water temperature on the secondary side does not fluctuate. The hot water supply is small, and hot water supply at arbitrary hot water temperatures and hot water μ can be carried out in one continuous rotation within the allowable range IJI1, and hot water dispensing characteristics almost equivalent to those of the proportional control system can be obtained.

As described in Part 2, according to this embodiment, the direct heating method and indirect heating method are selected depending on the hot water supply load, so the combustion output of the burner (3) is divided into two stages, Q and Q/2. Vc indulgence,
And just by adjusting the combustion time, the hot water supply capacity fr: Jiga 1
It becomes possible to adjust the VC over a wide range of cQ-Q/10, and it is possible to select an appropriate hot water supply capacity according to the hot water supply load V'c.

Furthermore, since there is no need to vary the combustion output over a wide range, it is possible to use a kerosene-fired burner and obtain hot water output characteristics equivalent to those of the proportional control system. In particular, the temperature of the water supplied from the solar water heater is slightly raised (for example, from 57℃ to 42℃).
Even when hot water is heated for showering, such as in the summer, there is little fluctuation in the water temperature, and it is easy to use, eliminating the need to mix hot and cold water.

(e) Effect of firing As explained above, the present invention connects the water supply pipe to the water supply inlet of the main heat exchanger kg directly heated by the burner through the first check valve, and For hot water supply [-1 is indirect heat exchange k
The water supply pipe is connected to the first inlet of the three-way valve via the next circuit, and the water supply is branched on the upstream side of the first check valve, and the branched water supply pipe is connected to the second inlet of the indirect heat exchanger. Connect to the second βL inlet 1:1 of the three-way valve via the next circuit, and circulate between the primary circuit of the indirect heat converter and the 1111th inlet of the three-way valve, and the water supply type ['' of the main heat converter. A pump and a second check valve are connected to each other by an off-shore connection pipe, and a hot water pipe is connected to the outlet of the three-way valve. At the same time, the circulation pump is operated during the passage between the second inflow row outlet 1 and the communication between the second inflow row outlet 1 and the communication between the second inflow row outlet 1 and the communication between the second inflow row outlet 1. It is equipped with a control device to adjust the hot water supply load (+1), so when the hot water supply load is large, the direct heating method can be used to supply high-temperature hot water with large iVC as in the conventional system, which reduces the hot water supply load. When it is small, use indirect heating method,
By adjusting the burner heating@, it is possible to respond to slight temperature rises such as water supplied from a solar water heater or small hot water supply, and the hot water supply capacity can be adjusted over a wide range of VC to match the supply load. , it saves you the trouble of mixing hot water and is easy to use f7c (
& has been. Moreover, it is not necessary to reduce the burner output significantly to obtain a small supply #J capacity, and there is no need to frequently turn the burner on and off. It is possible to obtain output characteristics equivalent to those of the Goyoro proportional control method, and is the durability of the burner VC adversely affected? It has excellent effects and there is no risk of damage.

[Brief explanation of drawings]

The figure is a system diagram showing an embodiment of the device of the present invention.

Claims (1)

[Claims] (1) Connect the water supply pipe to the water supply inlet of the main heat exchanger that is directly heated by the burner through the first check valve, and connect the hot water supply outlet of the earth heat exchanger to the primary circuit of the indirect heat exchanger. The water supply pipe is connected to the first inlet of the three-way valve through the valve, and the water supply pipe is branched on the upstream side of the first check valve, and the branched water supply pipe is connected to the first inlet of the three-way valve through the secondary circuit of the indirect heat exchanger. 2 inlets are connected to VC, and a circulation bonder and a second check valve are interposed between the primary circuit of the indirect heat exchanger and the first inlet of the three-way valve, and the water supply inlet of the main heat exchanger. A hot water pipe is connected to the outflow port of the three-way valve, and communication between the first inflow and outflow ports of the three-way valve and communication between the second inflow and outflow ports of the three-way valve is established depending on the hot water supply load. A hot water supply device characterized in that it is equipped with a control device 111 which performs switching, operates a circulation pump when communicating between @2 inflow and low outlet, and adjusts the combustion stitch of a burner.