JPH062874A - Hot water supplier - Google Patents

Abstract

PURPOSE:To secure an instant supply of hot water by providing an opening and closing control valve having a temperature sensing part in a hot water return pipe for controlling a flow of heat source side heating medium. CONSTITUTION:When temperature at a temerature sensing part 64 in a hot water return pipe drops down below a prescribed value, an opening and closing control valve 62 opens, so that a heat source side heating medium of high temperature, which is a driving source for an instant hot water circulation pump 33, flows into a heating fluid passage 45. This heating medium heats an operation medium for vaporization and gasification, and pressure generated by this gasifying expansion moves a driven impeller 39/ Hot water in a circulation passage 31 is circulated by the movement of the impeller 39 thus moved and heated by the heat source side heating medium so that its temperature is raised up. Thus the temperature of the hot water is prevented from dropping down. If hot water plugs 27 and 27' are opened to keep high the temperature of the supplied hot water within a hot water go pipe 28, hot water, whose temperature is raised up, enters at once hot water supplying connection ports 27a and 27a'. By this, hot water can be made to go out of hot water outlets 27c and 27c' instantly, whereby an instant supply of hot water can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system for a central residential building used in an apartment house or the like.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional hot water supply device for a central residential building.

In FIG. 4, a heat medium as a heat source is circulated toward each dwelling unit, and heat is exchanged with the heat medium at each dwelling unit to obtain hot water supply.
The heating medium heater 1 for the central heating medium of the dwelling is connected with the heating medium outward pipe 2 toward each floor and each dwelling unit of the residential building, and the heating medium return pipe is connected at the end of the heating medium forward pipe 2. 3 is piped to form a heat medium circulation passage 4, and a heat medium circulation pump 5 is provided in the heat medium circulation passage 4. Reference numerals 6 and 6'indicate hot water supply devices in each dwelling unit, which have a heat exchanger 7 for hot water supply and mixing plugs 8 and 8 '. One end of the primary side flow path 7 a of the heat exchanger 7 for hot water supply is connected to the heat medium forward pipe 2, and the other end is connected to the heat medium return pipe 3. Further, one end of the secondary side flow passage 7b having a heat exchange relationship with the primary side flow passage 7a is connected to the water supply pipe 9a, and the other end is connected via the hot water supply pipe 10 to the mixing plugs 8 and 8 '.

In the above-mentioned hot water supply system of the central building, high temperature hot water (70 to 85 ° C.) is produced by the heat medium heater 1 and is circulated by the heat medium circulation pump 5 to each dwelling unit of the entire dwelling unit. It uses hot water by exchanging heat with the heating medium. In this type of hot water supply system, the heat medium of high temperature and high pressure that circulates throughout the entire building (higher pressure is required as the number of building floors in the building is higher) is not connected to the outlet of each dwelling unit. This is especially effective in high-rise apartments, etc., because it is safe even at times.

However, in this method, when the hot water supply pipe 10 is long, it takes a long time until the hot water of appropriate temperature starts to come out from the hot water outlets 8a, 8a 'of the mixing taps 8, 8', which is inconvenient because of no immediate hot water. At the same time, there was a waste of water that had accumulated in the hot water discharge pipe 10 during the stoppage and wasted due to heat dissipation.

To solve this problem, there is a hot water supply device shown in FIG. In FIG. 5, hot water supply pipes 13 on the outlet side of a heat exchanger 12 heated by a combustion device 11 are provided with hot water taps 14 and 14 ', a return pipe 15 and a circulation pump 1 driven by an electric motor.
6, a temperature detector 17, a fuel supply valve 18, and a controller 19 are provided.

In this hot water supply device, when the temperature detector 17 detects a decrease in hot water temperature in the hot water supply pipe 13, the electric motor driven circulation pump 16 is operated via the control device 19 and the combustion device 11 is used to heat the hot water supply pipe 13. The temperature of the hot water is raised.

[0008]

However, in the above-mentioned conventional structure in which the combustion device and the circulation pump are provided in each door, there is a problem in safety and noise reduction in a high-rise apartment house, and the above-mentioned conventional heat medium circulation is used. If a conventional electric motor driven circulation pump is added to the system, electrical work must be added to the hot water supply device of each dwelling unit, which raises construction costs, and running electric circulation pumps raises running costs. there were.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a hot water supply device for a central area of a residential building, etc., which has immediate hot water properties and is low in initial and running costs.

[0010]

In order to achieve the above object, the present invention uses a heat transfer relationship between a primary side flow path connected to a heat source side heat medium passage and a secondary side flow path communicating with a water supply pipe. Evaporation with a hot water supply heat exchanger, a circulation path in which the outlet of the secondary side flow passage, a hot water tap, and an inlet of the secondary side flow passage are annularly connected by a hot water supply forward pipe and a hot water supply return pipe, and a heating fluid passage A drive impeller housed in a working medium circuit in which a working medium circuit enclosing a working medium that changes the gas-liquid phase is annularly connected to a condenser having the hot water supply returning pipe as a heat radiating portion, and a driven fluid passage connected to the hot water returning pipe. It has an immediate hot water circulation pump that is airtightly separated from the housed driven impeller via a partition wall and connected so that power can be transmitted, and has an open / close control valve that is opened / closed by a temperature sensing unit provided in the hot water supply return pipe. A configuration in which the heating fluid passage is connected to the heat source side heat medium passage by an introduction pipe, To have.

[0011]

According to the present invention, when the temperature of the hot water return pipe is lowered to a predetermined value or less, the opening / closing control valve opens and the high-temperature heat source side heat medium flows in the heating fluid passage, and the heat medium heats the working medium. The driven impeller is moved by evaporating it and applying the pressure generated by this vaporization and expansion to the drive impeller to drive it. By the movement of the driven impeller, the hot water in the circulation path is circulated and heated by the heat medium on the heat source side in the hot water supply heat exchanger to raise the temperature and prevent the decrease in the hot water temperature.

When the temperature-sensing portion of the hot water supply return pipe reaches a predetermined temperature or higher due to the circulating heating of the hot water in the circulation path, the opening / closing control valve is closed and the flow of the heat source side heat medium into the heating fluid passage is stopped, so that the working medium is discharged. Heating is stopped and the drive impeller is stopped. Therefore, the circulating heating action of the hot water in the circulation path is stopped.

As described above, the hot water temperature in the circulation path is maintained at a predetermined value or higher to realize quick hot water.

[0014]

Embodiments of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 21 is a hot water supply heat exchanger, the primary side flow path 22 of which is connected to a heat source side heat medium passage 23, and the secondary side flow path 24 of which is connected an inlet 25 side with a water supply pipe 26. Thus, the primary side flow passage 22 and the secondary side flow passage 24 are kept in a heat transfer relationship. 27 and 27 'are hot water taps, and have hot water supply connection ports 27a and 27'a, water supply connection ports 27b and 27'b, and hot water supply ports 27c and 27'c. This tap 2
7, 27 'are hot water supply connection ports 27a, 27'a
8 is connected to the outlet 29 of the secondary side flow path 24.
Reference numeral 30 is a hot water tap water supply pipe, and water supply connection ports 27c and 27 '.
connected to c. Reference numeral 31 denotes a hot water supply return pipe 32 that connects the end of the hot water supply forward pipe 28 and the inlet 25 of the secondary side flow path 24, and a circulation path that is annularly connected by the hot water supply forward pipe 28.

33 is an instant hot water circulation pump, 34 is a check valve, 3
Reference numeral 5 denotes a heat medium outward pipe for central hot water supply for the living ridge, and 36 denotes a heat medium return pipe for central hot water supply for the residential ward. The heat medium outward pipe 35 and the heat medium return pipe 36 are heat medium heating units (not shown). And a heat medium pumping unit (not shown).

Next, the immediate hot water circulation pump 33 shown in FIG.
This will be described with reference to FIG. The drive impeller 37 and the driven impeller 39 provided in the driven fluid passage 38 are airtightly separated via a partition wall 40, but the drive side integrally attached to the drive impeller 37 via a holder 41. A magnet 42 and a driven magnet 43 that is integrally attached to the driven impeller 39 are coupled to each other so that power can be transmitted by magnetic force.

44 is an evaporator having a heating fluid passage 45,
Reference numeral 46 is a heat transfer fan provided in the heating fluid passage 45. Four
Reference numeral 7 denotes a working medium circuit in which an evaporator 44 and a condenser 48 are annularly connected by a gas outward pipe 49 and a liquid return pipe 50, and a working medium such as a CFC refrigerant that changes into a gas phase or a liquid phase is enclosed.
Is a check valve provided in the liquid return pipe 50.

The drive impeller 37 has a working medium circuit 47 as described above.
The drive fluid passage 5 formed by the drive side casing 52 integrally formed with the evaporator 44, which is located in the storage position.
It is stored in 3. The inlet side of the drive fluid passage 53 communicates with the gas phase portion 44a of the evaporator 44, where the heated and vaporized working medium is stored, through the ejection hole 54, and the outlet side is connected to the condenser 48 by the gas outward pipe 49. Has been done.

The heat radiating portion 48a of the condenser 48 is the hot water return pipe 32.
And the hot water return pipe 32 and the working medium circuit 47 are held in a transmission relationship. Further, the driven fluid passage 38 formed of the driven side casing 55 and housing the driven impeller 39 is connected to the hot water return pipe 32.

Reference numeral 56 denotes a drive support shaft that allows the drive impeller 37 to rotate, and one end of the bearing 5 is provided in the recess of the partition wall 40.
7, and the other end is supported by a bearing 58 provided on the drive side casing 52. Reference numeral 59 denotes a driven support shaft that allows the driven impeller 39 to rotate, one end of which is supported by a bearing 60 provided in the recess of the partition wall 40, and the other end of which is supported by a bearing 61 provided in the driven side casing 55.

As described above, the drive impeller 37 and the driven impeller 39 are rotatably supported, respectively. However, the drive-side magnet 42 and the driven-side magnet 43 are provided at positions facing each other through the partition wall 40. They are connected indirectly, though indirectly, by magnetic coupling.

Reference numeral 62 in FIG. 1 denotes a temperature-driven open / close control valve such as a built-in wax thermometer provided in the introduction pipe 63, and a temperature sensing portion 64 for detecting the temperature is provided in the hot water return pipe 32 so as to be in thermal contact therewith. ing.

The heating fluid passage 45 is located in the liquid phase portion 44b in the evaporator 44 where the liquid working medium is accumulated, and
An inlet pipe 63 having an open / close control valve 62 is connected to the heat source side heat medium passage 23 in parallel with the hot water supply heat exchanger 21.

The operation of the hot water circulation pump 33 having the above structure will be described. As shown in FIG. 3, when the temperature of the hot water supply return pipe 32 radiates heat and decreases, and when the temperature sensing unit 64 decreases to the valve opening temperature T _ON or lower at time t ₁ , the opening / closing control valve provided in the introduction pipe 63. 62 is opened. This open / close control valve 62
Opens, the high temperature heat source side heat medium flows in the heating fluid passage 45,
The heat medium heats the liquid working medium to evaporate and vaporize it.
The working medium that has been vaporized to expand its volume is the gas phase portion 44a.
Further, it violently ejects toward the drive impeller 37 through the ejection holes 54, rotates the drive impeller 37, passes through the gas outgoing pipe 49, and goes toward the condenser 48.

The drive-side magnet 42 integrally rotated by the rotation of the drive impeller 37 is rotated, and the driven impeller 39 is rotated by rotating the driven-side magnet 43 coupled by the magnetic force. The rotation of the driven impeller 39 causes a pumping action to circulate the hot water supply in the circulation path 31 (shown by solid arrows in FIGS. 1 and 2), and the hot water supply heat exchanger 2
In 1, the heating medium is heated by the heat medium on the heat source side and the hot water supply pipe 28
Keep the hot water inside.

The working medium that is a gas flowing out of the gas outflow pipe 49 by rotating the drive impeller 37 enters the condenser 48 and radiates heat to the hot water supplied through the heat radiating portion 48a to be condensed and liquefied. The working medium that has become liquid returns to the liquid phase portion 44b of the evaporator 44 through the liquid return pipe 50 and the check valve 51. As described above, the working medium is circulated in the working medium circuit 47 (represented by a black arrow in FIGS. 1 and 2) to repeat the phase change cycle by heating vaporization by the heat medium on the heat source side and radiative liquefaction to the hot water. .

The rotation of the driven impeller 39 by the driving impeller 37 raises the temperature of the hot water supplied in the circulation path 31, and the temperature sensing section 64 provided in the hot water return pipe 32 at time t _{2 as} shown in FIG. When the temperature rises above the valve closing temperature T _OFF, the opening / closing control valve 62 provided in the introduction pipe 63 is closed. Therefore, the introduction pipe 63
The flow of the heat medium on the heat source side that has flowed through the heating fluid passage 45 is stopped, the circulation of the working medium is stopped together with the stop of the heating and vaporizing operation of the working medium, and the operation of the hot water circulation pump 33 is stopped.

When the hot water supply in the circulation path 31 is stopped by circulation heating, the temperature of the hot water gradually decreases due to heat radiation, and when the temperature of the temperature sensing portion 64 again falls below the valve opening temperature T _ON , the circulation heating operation described above is performed. Repeated.

In order to keep the hot water in the hot water supply pipe 28 warm as described above, the hot water supply connection port 2 is opened when the hot water taps 27 and 27 'are opened.
Hot water is immediately introduced into 7a and 27'a, so tap hole 2
Hot water can be immediately discharged from 7c and 27'c, and immediate hot water property can be secured.

Further, since the hot water circulation pump is driven by utilizing the heat of the heat medium on the heat source side, the electricity cost generated in the conventional electric motor drive system is unnecessary and the running cost is reduced.

Furthermore, the hot water circulation pump can be started and stopped automatically by using a temperature-driven open / close control valve such as a wax thermostat, so that automatic start / stop control can be performed without using electricity, and control is facilitated and reliability is improved.

Furthermore, since electricity can be dispensed with in this hot water supply device, in an apartment house, the piping space of each door does not require electrical work on the pipe shaft where the hot water supply device is installed, and the initial cost can be reduced by saving work. You can

Further, the high temperature heat source side heat medium (70 to 85 ° C.)
Since the hot water circulation pump can be driven with high efficiency by the pressure of the phase change of the working medium using the heat of, the flow rate of the heat source side heat medium can be reduced, and the pressure loss of the heat source side heat medium passage 23 becomes small,
Further, a decrease in the flow rate of the heat medium on the heat source side to the hot water supply heat exchanger 21 is reduced, so that a stable hot water supply capacity can be secured.

Further, since the noise of the circulation pump drive, which has been generated by the rotation of the electric motor in the related art, is eliminated, the noise can be reduced. Therefore, the noise is reduced particularly in an apartment house or the like where a large number of hot water heaters are intensively installed. Is effective for improving comfort.

When the hot water taps 27 and 27 'are opened and hot water is discharged, the hot water is supplied to the hot water heat exchanger 21 by the force of the hot water (shown by the broken line arrow in FIG. 1) flowing through the hot water supply pipe 26. Hot water heated by exchanging heat with the heat medium on the heat source side is tapped 27, 2.
At 7 ', water is supplied from the hot water tap water supply pipe 30 (indicated by a broken line arrow in FIG. 1) to bring it to an arbitrary hot water temperature.

[0037]

As described above, according to the hot water supply apparatus of the present invention, the hot water supply heat exchanger and the hot water tap, in which the heat medium on the heat source side and the hot water are in a heat transfer relationship, are connected in an annular shape by the hot water supply forward pipe and the hot water supply return pipe. However, in addition to providing a hot water circulation pump that uses the pressure generated by the vaporization of the working medium in addition to the high-temperature heat of the heat medium on the heat source side as a drive source, the hot water circulation pump is provided with To control the flow of the heat medium on the heat source side, which is the drive source, the hot water recirculation pipe is equipped with an open / close control valve with a temperature sensing part. Since it is not necessary, the running cost is low, the control is easy and the reliability is improved by the automatic start / stop control of the heat medium for driving the pump by the temperature-driven open / close control valve, and electricity is not required, so the construction work can be saved. The work efficiency can be improved.

Further, the flow rate of the heat medium on the heat source side for driving the hot water circulation pump can be reduced, the flow rate of the heat medium on the heat source side to the hot water supply heat exchanger does not decrease, and a stable hot water supply capacity can be guaranteed. Since the noise of the circulation pump due to is eliminated, there is an advantage that noise can be reduced and comfort is improved.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a water heater according to an embodiment of the present invention.

FIG. 2 is a sectional view of an instant hot water circulation pump according to an embodiment of the present invention.

FIG. 3 is an operation explanatory view of the opening / closing control valve of the present invention.

FIG. 4 is a system configuration diagram of a conventional hot water supply device.

FIG. 5 is a block diagram of an immediate hot water system of a conventional hot water supply device.

[Explanation of symbols]

 21 hot water supply heat exchanger 22 primary side flow path 23 heat source side heat medium path 24 secondary side flow path 25 inlet 26 water supply pipe 27, 27 'hot water tap 28 hot water inlet pipe 29 outlet 31 circulation path 32 hot water return pipe 33 immediate hot water circulation Pump 37 Driven impeller 38 Driven fluid passage 39 Driven impeller 40 Partition wall 44 Evaporator 45 Heating fluid passage 47 Working medium circuit 48 Condenser 48a Heat dissipation part 62 Opening / closing control valve 63 Introducing pipe 64 Temperature sensing part

Claims (1)

[Claims] 1. A hot water supply heat exchanger having a heat transfer relationship between a primary side flow path connected to a heat source side heat medium passage and a secondary side flow path communicating with a water supply pipe, and an outlet of the secondary side flow path, A hot water tap, a circulation path in which the inlet of the secondary side flow path is annularly connected by a hot water supply forward pipe and a hot water supply return pipe, and an evaporator having a heating fluid passage and a condenser having the hot water supply return pipe as a heat radiation part; Are connected to each other in an annular manner, and a driving impeller housed in a working medium circuit enclosing a working medium that undergoes a gas-liquid phase change, and a driven impeller housed in a driven fluid passage connected to the hot water return pipe are hermetically sealed via a partition wall. Separated into
Further, the heating fluid passage is connected to the heat source side heat medium passage by an introduction pipe having an immediate hot water circulation pump connected so that power can be transmitted, and an opening / closing control valve opened and closed by a temperature sensing portion provided in the hot water supply return pipe. Hot water supply equipment.