JPS6124844Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Industrial Application Field The present invention relates to a hot water supply device, and particularly relates to a hot water supply device that supplies two types of hot water, high and low temperature.

(2) Prior art and its problems Conventionally, when heating water from a tap source to obtain two types of hot water, high and low temperatures, one method is to first heat the tap water to the desired high temperature. Relatively high-temperature hot water is obtained by heating in a similar manner, and relatively low-temperature hot water is obtained by appropriately mixing tap water with the relatively high-temperature hot water. Another method is to separately produce hot water at high and low temperatures from tap water.

However, in the first method, in order to obtain hot water at a low temperature, tap water whose temperature is not necessarily constant must be mixed each time, which is inconvenient in use. In addition, the second method requires two independent heat exchangers, and in order to heat tap water with temperature fluctuations to the desired temperature, the capacity of the heat exchanger is adjusted to take into account the fluctuation range. It is necessary to have some leeway;
There is a drawback that the entire Ikioi device must be large in size.

Another method is to configure a hot water supply device by combining one hot water tank and one instantaneous water heater connected to it, as explained in Japanese Utility Model Application Publication No. 51-86853. , a device has been disclosed in which high and low temperature hot water can be obtained separately. However, in this method, high-temperature hot water is created from low-temperature hot water, so there is no need to consider the capacity of the heat exchanger as much as possible. However, the use of an instantaneous water heater causes instability in temperature control, which poses a problem in use.

Moreover, the temperature control of hot water in these conventional hot water supply devices is performed using the output of a temperature sensor such as a thermistor that is covered with a protective tube, so the responsiveness is poor.
There was a problem in that temperature control could not keep up with rapid changes in the flow rate of tap water due to load fluctuations.

(3) Purpose of the present invention The present invention aims to solve the problems that conventional hot water supply devices that can simultaneously obtain high-temperature water and low-temperature water, as described above, have: (a) The accuracy of temperature setting is insufficient. .

(b) The device becomes large.

(c) The device becomes complicated.

(d) Temperature control has poor responsiveness to load fluctuations.

The object of the present invention is to provide a hot water supply device that is compact, has stable temperature settings, and can simultaneously supply hot water at high temperatures and low temperatures.

(4) Structure of the present invention In order to achieve the above object, the present invention arranges two low-pressure steam generation chambers into an integral structure, and provides hot water supply to each of the low-pressure steam generation chambers. The combustion volume of the combustor, which heats the medium sealed in the two low-pressure steam generation chambers, is determined by the internal steam pressure in the low-pressure steam generation chambers. By controlling each of them to a predetermined constant value, low-temperature hot water can be obtained from the coiled pipe placed in the low-pressure steam generation chamber in the first stage, and the hot water can be obtained from the coiled pipe placed in the low-pressure steam generation chamber in the second stage. By configuring the system to obtain high-temperature hot water from a coiled pipe, the present invention provides a compact hot water supply device that can simultaneously supply high-temperature water and low-temperature water with excellent accuracy and responsiveness in setting the hot water temperature.

Hereinafter, the present invention will be described in detail based on examples.

(5) Description of Examples Next, the present invention will be described in detail with reference to the drawings.
In the drawing, 10 is the low-pressure steam generation chamber in the previous stage, 2
0 is a low-pressure steam generation chamber in the latter stage. These two low-pressure steam generation chambers are provided in one body through a flue 30 so as to form an integral structure, as shown in the figure. The interiors of these two low-pressure steam generation chambers 10 and 20 are sealed at low pressure or near-vacuum pressure, and are filled with a medium, such as water, sufficient to generate saturated steam pressure.

14 is a flexible pipe arranged inside the low-pressure steam generation chamber 10 at the front stage, and 24 is a flexible pipe arranged inside the low-pressure steam generation chamber 20 at the rear stage. These flexible pipes 14 and 24 are connected in series via a pipe 32 provided in the flue 30 and a three-way branch 36 provided outside the body.

33 is a tap water supply pipe connected to the inlet side of the flexible pipe 14, and introduces tap water supplied from a water source (not shown) into the flexible pipe 14. 34 is a low temperature hot water pipe connected to the three-way branch 36;
is a high temperature hot water pipe connected to the outlet side of the flexible pipe 24.

11 is a combustor that heats the medium sealed in the low-pressure steam generation chamber 10 at the front stage, and 21 is a combustor that heats the medium sealed in the low-pressure steam generation chamber 20 at the rear stage. 12 is a control valve for controlling the amount of fuel supplied to the combustor 11 from a fuel supply means (not shown) to control the combustion amount of the combustor 11; 22 is a control valve for controlling the amount of fuel supplied to the combustor 11 from a fuel supply means (not shown); This is a control valve for controlling the amount of fuel supplied to the combustor 21 to control the combustion amount of the combustor 21.

13 is a steam pressure detector that detects the internal steam pressure of the low-pressure steam generation chamber 10 in the previous stage;
is a steam pressure detector that detects the internal steam pressure of the low-pressure steam generation chamber 20 at the subsequent stage. control valve 12
is controlled by the detected value of this steam pressure detector 13, and the control valve 22 is configured to be controlled by the detected value of this steam pressure detector 23. Also,
31 is a fuel air supply pump that supplies air for combustion.

Next, the operation of the present invention configured as described above will be explained. When the fuel-air supply pump 31 is driven by an instruction from a controller (not shown) and the combustor 11 starts combustion, the medium in the low-pressure steam generation chamber 10 is heated to generate steam. On the other hand, tap water passes through the tap water supply pipe 33 into the snake pipe 14.
When the steam flows through the pipe 14, the heat of the generated steam exchanges heat with the tap water flowing through the flexible pipe 14, thereby raising the temperature of the tap water and producing hot water. Here, the vapor of the medium that has lost heat is liquefied, heated again, and evaporated, and the cycle is repeated. This heat exchange is achieved very quickly because it is based on the latent heat associated with the phase change of the medium from vapor to liquid phase.

The steam pressure detector 13 is composed of, for example, a pressure displacement element such as a diaphragm or a bellows, and directly detects the pressure of the generated steam. The valve opening of the control valve 12 is controlled by the pressure detected by the steam pressure detector 13, and the combustion amount of the combustor 11 is controlled so that the pressure of the generated steam is constant. That is, when the steam pressure detected by the steam pressure detector 13 increases, the valve opening of the control valve 12 is operated in a direction to decrease the combustion amount of the combustor 11, and the steam pressure detector 13 detects When the steam pressure decreases, the valve opening of the control valve 12 is operated to increase, and the combustion amount of the combustor 11 is controlled to increase. With this kind of operation, the low pressure steam generation chamber 1
Since the internal steam pressure of 0 is controlled to a predetermined constant value, the steam temperature, which corresponds one-to-one to the steam pressure, is controlled to a predetermined constant value. The temperature will be kept at a predetermined value. In addition, the low pressure steam pressure chamber 10
The reason why the pressure was set to a low pressure of 1 atm or less was to make it possible to obtain hot water of 100°C or less.

The hot water generated in the flexible pipe 14 passes through the pipe 32, the three-way branch 36, and the low-temperature hot water pipe 34, and is supplied to the user as low-temperature hot water. Here, the reason why the pipe 32 is placed inside the flue 30 is to eliminate energy loss as much as possible.
It's not necessarily necessary.

Hot water generated in the low-pressure steam generation chamber 10 at the front stage is introduced into the flexible pipe 24 via the three-way branch 36. The flexible pipe 24 provided in the low-pressure steam generation chamber 20 at the rear stage also connects to the low-pressure steam generation chamber 1 at the front stage.
Similarly to the flexible pipe 14 provided in the low-pressure steam generation chamber 20, it constitutes a heat exchanger based on the latent heat associated with the phase change of the medium enclosed in the low-pressure steam generation chamber 20 from vapor to liquid phase.
The valve opening of the control valve 22 is controlled based on the pressure detected by the steam pressure detector 23, and the combustion amount of the combustor 21 is controlled so that the pressure of the generated steam is constant. Thereby, the outlet temperature of the hot water passing through the flexible pipe 24 is maintained at a predetermined value. The hot water generated in the flexible pipe 24 passes through the high temperature hot water pipe 35 and is supplied to the user as high temperature hot water.

In practice, the proportion of flow from the branch 36 to the pipe 34 and the flexible pipe 24 varies depending on the load demand, and since hot water supply for domestic use often experiences rapid load fluctuations, the hot water temperature Control is required to follow rapidly. Conventional temperature control detects the steam temperature in the evaporation chamber and controls the fuel valve based on this value, but temperature detection in the steam atmosphere is performed using electrical devices such as thermistors covered with protective tubes or thermometers. A detector or a liquid expansion type detector is used. However, temperature detection using these conventional methods has a time delay, making it difficult to follow sudden load changes, especially when hot water is supplied from a heat exchanger via a short pipe.
Hot water that is not at an appropriate temperature may be supplied even temporarily.

In contrast, in the present invention, in order to cope with such rapid load fluctuations, the hot water temperature is adjusted by directly detecting the internal pressure of the low-pressure steam generation chamber.

Note that the output temperature can be arbitrarily easily and precisely set using a commonly known technique that changes the correspondence between the internal steam pressure of the low-pressure steam generation chamber and the valve opening of the control valve. Since two low-pressure steam generation chambers are provided, one in the front stage and the other in the rear stage, the temperature settings for low-temperature hot water and high-temperature hot water can be freely set. Further, suppressing the fluctuation range of the tapping temperature can be achieved by making the size of the flexible pipe (i.e., the heat capacity) much smaller than the volume of the sealed chamber (i.e., the calorific value of the evaporation medium).

In addition, as an example of a one-piece structure, as illustrated in this drawing, two heat exchangers for low-pressure steam generation chambers are arranged around the flue 30, and the combustors 11 and 12 are arranged. By arranging them in the same container, it is possible to share the flue 30 and the combustion air supply pump 31 with the heat exchangers associated with the two low-pressure steam generation chambers.

(6) Effects of the present invention In order to obtain two types of hot water, high-temperature water and low-temperature water, the present invention arranges heat exchangers of the same configuration in an integrated structure to form a series connection, which can be shared. By sharing parts, the entire device is made compact and simple. From now on, the 51st year of actual
- By simply connecting different types of heat exchangers as exemplified in Publication No. 86853, it is possible to overcome the drawbacks of the conventional configuration, such as the large size and complexity of the device. Ta.

Furthermore, the present invention has the heat exchanger itself comprised of a low-pressure steam generation chamber and a corrugated pipe disposed inside the heat exchanger, and the water flowing through the corrugated tube with the vapor temperature of the medium sealed in the low-pressure steam generation chamber. By exchanging heat with water, stable temperature control can be achieved, and
The heat exchange control of the heat exchanger configured in this way is performed so that the steam pressure inside the low-pressure steam generation chamber is constant.
Since the control valve for direct combustion is controlled by the steam pressure itself, the response of hot water temperature to load fluctuations can be significantly improved, making it more practical.

[Brief explanation of the drawing]

The figure is a configuration diagram of an embodiment of the present invention. 10... Front stage low pressure steam generation chamber, 13, 23...
...Steam pressure detector, 20...Late stage low pressure steam generation chamber, 33...Tap water supply pipe, 34...Low temperature hot water pipe, 35...High temperature hot water pipe.

Claims (1)

[Scope of utility model registration request] A first and a second body disposed inside one body.
a low-pressure steam generation chamber, first and second heaters that heat respective media sealed in the first and second low-pressure steam generation chambers, and these first and second heaters. a fuel supply input stage for supplying heat to the first and second heaters; first and second fuel supply amount control means for controlling the amount of fuel supplied to the first and second heaters; an air supply means for supplying air necessary for combustion of the steam generator; and first and second pressure detectors provided in the first and second low-pressure steam generation chambers and responsive to the steam pressure in these chambers. and a first flexible pipe provided in the first low-pressure steam generation chamber and connected to a water source; and a first flexible pipe provided in the second low-pressure steam generation chamber and connected in series to the first flexible pipe. A second flexible pipe is provided at a connection point between the first flexible pipe and the second flexible pipe, and a part of the tap water led from the first flexible pipe to the second flexible pipe is directed to the outside of the body. and a three-way branching means for deriving the pressure from the first and second pressure detectors so that the pressures in the first and second low-pressure steam generation chambers reach respective predetermined values at the detected pressures of the first and second pressure detectors. By adjusting the second fuel supply amount control means, hot water at a first predetermined low temperature is obtained from the three-way branching means, and hot water at a second predetermined high temperature is obtained from the second flexible pipe. A hot water supply device characterized in that the hot water supply device is configured to obtain hot water.