JP3211367B2 - Water heater - Google Patents

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 device for a residential building central used in an apartment house or the like.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional hot water supply device for a residential building central.

FIG. 3 shows a method of circulating a heat medium as a heat source toward each dwelling unit and exchanging heat with the heat medium at each dwelling unit to obtain hot water.
A heating medium outlet pipe 2 is connected to the heating medium heater 1 for the heating medium for the central heating medium of the housing building toward each floor and each dwelling unit of the housing building, and a heating medium return pipe connected at an end of the heating medium outlet pipe 2. A heat medium circulation path 4 is formed by piping 3, and a heat medium circulation pump 5 is provided in the heat medium circulation path 4. Reference numerals 6, 6 'denote hot water supply units in each dwelling unit, which have a heat exchanger 7 for hot water supply and mixing taps 8, 8'. One end of the primary flow path 7 a of the hot water supply heat exchanger 7 is connected to the heat medium outlet pipe 2, and the other end is connected to the heat medium return pipe 3. One end of the secondary flow path 7b, which has a heat exchange relationship with the primary flow path 7a, is connected to the water supply pipe 9a, and the other end is connected to the mixing plugs 8, 8 'via the hot water supply pipe 10.

[0004] In the hot water supply apparatus of the above living building central, high-temperature hot water (70-85 ° C) is produced by the heating medium heater 1 and circulated by the heating medium circulating pump 5 to each dwelling unit of the whole living building. The heat exchange between the heat medium and the feed water is used for hot water supply. This type of hot water supply system is configured so that the high-temperature and high-pressure heat medium circulating through the entire living building (the higher the building floor of the living building is, the higher the pressure is) is not connected to the hot water outlet in each dwelling unit. It is especially effective in high-rise apartment buildings because it is safe 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 a suitable temperature starts to be discharged from the outlets 8a, 8a 'of the mixing taps 8, 8', which is inconvenient because there is no instantaneous hot water. At the same time, during stoppage, the waste water is accumulated in the tapping pipe 10 and water cooled by heat radiation is discarded.

To solve this, there is a hot water supply apparatus shown in FIG. FIG. 4 shows a hot water supply pipe 13 on the outlet side of a heat exchanger 12 heated by a combustion device 11 provided with hot water taps 14, 14 ', a return pipe 15, and a motor driven circulating pump 1.
6, a temperature detector 17, a fuel supply valve 18, and a control device 19 are provided.

When the temperature detector 17 detects a decrease in the temperature of the hot water in the hot water supply pipe 13, the hot water supply apparatus operates the circulating pump 16 driven by the electric motor via the control device 19 and heats the fuel by the combustion device 11. The temperature of the hot water is raised.

[0008]

However, in the above-described conventional configuration in which a combustion device and a circulation pump are provided in each house, there are problems in terms of safety and low noise in a high-rise apartment house, and the above-described conventional heat medium circulation It is not enough to add a conventional electric motor driven circulation pump to the system, and electric work must be added to the hot water supply unit in each dwelling unit, which increases the construction cost and increases the running cost by operating the electric circulation pump. There were problems such as becoming.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a hot water supply apparatus having a quick-starting property and low initial costs and running costs as a hot water supply apparatus for a residential building central or the like.

[0010]

According to the present invention, in order to achieve the above object, heat exchange is performed between a primary flow path connected to a heat source side heat medium passage and a secondary flow path communicating with a water supply pipe at an inlet side. A hot water supply heat exchanger, and a circulation path in which an outlet of the secondary flow path, a tap, and an inlet of the secondary flow path are sequentially connected in an annular shape by a hot water supply pipe and a hot water return pipe, and A car and a driven impeller provided in a driven fluid passage are air-tightly separated via a partition wall, and have a hot water circulation pump connected so as to be capable of transmitting power, and an evaporator having a heating fluid passage and a condenser having a heat radiating portion. The drive impeller is housed in a working medium circuit in which a working medium that changes phase by being connected in a ring is enclosed, the heating fluid passage is connected to a heat source side heating medium passage, and the driven fluid passage is connected to the hot water supply return pipe. Connected.

[0011]

According to the present invention, the working medium is heated and evaporated by the high-temperature heat source side heating medium, and the vaporized working medium is ejected toward the driving impeller to drive the driving impeller. Move the driven impeller. By the movement of the driven impeller, the hot water in the circulation path is circulated, heated by the hot heat source side heat medium in the hot water supply heat exchanger to prevent the temperature of the hot water in the hot water supply pipe from dropping, and immediately after the tap is opened. It realizes instant hot water properties.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 21 denotes a hot water supply heat exchanger, of which a primary side flow path 22 is connected to a heat source side heat transfer medium passage 23, and a secondary side flow path 24 is connected to an inlet 25 side with a water supply pipe 26. Thus, the primary side flow path 22 and the secondary side flow path 24 are maintained in a heat exchange relationship. Reference numerals 27 and 27 'denote hot water taps, which are hot water supply connection ports 27a and 27a' and water supply connection ports 27b and 27b '.
And tap holes 27c, 27c '. The hot water taps 27 and 27 ′ have hot water supply connection ports 27 a and 27 a ′ connected to an outlet 29 of the secondary side flow passage 24 of the hot water supply heat exchanger 21 through a hot water supply pipe 28. 30 is a tap water supply pipe, which is connected to the water supply connection ports 27c, 27c '. Reference numeral 31 denotes a circulation path circularly connected by a hot water supply return pipe 32 connecting the end of the hot water supply pipe 28 and the inlet 25 of the secondary flow path 24.

33 is a hot water circulation pump, 34 is a check valve, 3
5 is a heat medium return pipe for living building central hot water supply, 36 is a heat medium return pipe for living building central hot water supply, and the heat medium return pipe 35 and the heat medium return pipe 36 are heat medium heating sections (not shown). And a heating medium pumping section (not shown).

Next, the hot water circulation pump 33 will be described with reference to FIGS. Drive impeller 37 and driven fluid passage 38
The driven impeller 39 provided on the drive-side magnet 42 and the driven impeller 3 are hermetically separated via a partition wall 40 and integrally attached to the driving impeller 37 via a holder 41.
The driven magnet 43 is integrally connected to the driven magnet 9 so that power can be transmitted by magnetic force.

Reference numeral 44 denotes an evaporator having a heating fluid passage 45,
Reference numeral 46 denotes a heat transfer fin provided in the heating fluid passage 45. 4
Reference numeral 7 denotes a working medium circuit in which the evaporator 44 and the condenser 48 are connected in a ring shape by a gas forward pipe 49 and a liquid return pipe 50, and a working medium such as a Freon refrigerant which changes into a gas phase and a liquid phase is enclosed therein. Is a check valve provided in the liquid return pipe 50.

The drive impeller 37 is housed in the working medium circuit 47 and has a drive fluid passage 53 formed by a drive side casing 52 integrally formed with the evaporator 44.
It is stored in. The drive fluid passage 53 has an inlet connected to a gas phase portion 44a of the evaporator 44 in which the heated and vaporized working medium is stored through an ejection hole 54, and an outlet connected to a condenser 48 by a gas forward pipe 49. Have been.

The heating fluid passage 45 is located in the liquid phase portion 44b of the evaporator 44 where the working medium liquid is stored, and is connected to the heat source side heating medium passage 23.

The driven fluid passage 38 formed by the driven side casing 55 and accommodating the driven impeller 39 is provided in the hot water return pipe 3.
2 is connected.

The heat radiating portion 48a of the condenser 48 is provided in the hot water return pipe 32. Reference numeral 56 denotes a drive rotation shaft that makes the drive impeller 37 rotatable. One end is supported by a bearing 57 provided in a concave portion of the partition wall 40, and the other end is supported by a bearing 58 provided on the drive side casing 52. Reference numeral 59 denotes a driven rotation shaft that allows the driven impeller 39 to rotate freely. One end of the driven rotation shaft is supported by a bearing 60 provided in a concave portion of the partition wall 40, and the other end is supported by a bearing 61 provided in a driven casing 55.

The driving impeller 37 and the driven impeller 39 are rotatably supported, but are indirectly connected to each other by a magnetic coupling between a driving magnet 42 and a driven magnet 43 provided at positions facing each other via a partition wall 40. Although connected, they are connected together.

The hot water circulation pump 33 is constituted as described above, the heating fluid passage 45 is connected to the heat source side heat medium passage 23 in parallel with the hot water supply heat exchanger 21, and the driven fluid passage 38 is connected to the reverse of the hot water supply return pipe 32. A hot water supply device for each dwelling unit is inserted and connected to the upstream side of the stop valve 34.

In the above configuration, the hot water circulation pump 33
Will be described. A heat medium (indicated by a white arrow in FIGS. 1 and 2) flowing through the heat source side heat medium passage is introduced into the heating fluid passage 45, and heats the liquid phase of the working medium stored in the liquid phase portion 44b of the evaporator 44. To evaporate. The working medium, which has been vaporized and expanded in volume, is violently ejected from the gas phase portion 44a through the ejection hole 54 toward the drive impeller 37 to be driven.
Is rotated to flow out of the gas forward pipe 49.

The rotation of the drive impeller 37 causes the drive magnet 42 to rotate, and the driven magnet 43 coupled by magnetic force causes the driven impeller 39 to rotate. By the rotation of the driven impeller 39, a pump action is generated to circulate the hot water in the circulation path 31 (see FIG. 1,
In FIG. 2, the hot water supply heat exchanger 21 heats and raises the temperature of the hot water by the high-temperature heat source side heat medium to keep the hot water in the hot water supply pipe 28 warm.

The working medium of the gas flowing out of the gas forward pipe 49 by rotating the drive impeller 37 enters the condenser 48 and radiates heat to the hot water flowing through the heat radiating portion 48a to be condensed and liquefied. The working medium that has become liquid flows back to the liquid phase portion 44b of the evaporator 44 through the liquid return pipe 50 and the check valve 51. The flow of the working medium is indicated by a black arrow in FIGS. In this way, the working medium repeats a heating / vaporization by the heat source side heating medium and a phase change cycle by liquefaction of radiated heat to hot water.

As described above, in order to keep the hot water in the hot water supply pipe 28 warm, when the taps 27, 27 'are opened, the hot water connection port 2 is opened.
Outlet 2 for hot water immediately heated into 7a, 27a '
Hot water can be immediately discharged from 7c and 27c ', and quick-hot water property can be secured.

Further, since the pump is driven by the heat medium on the heat source side, the electricity cost which occurs in the conventional electric motor driving method is unnecessary, and the running cost is reduced. In addition, since the hot water supply device does not require electricity, in a condominium or the like, electrical work is not required for the pipe shaft, which is a piping space for each house and a hot water supply device installation location, and the initial cost can be reduced by labor saving.

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

In addition, noise can be reduced by eliminating the noise generated by the rotation of the motor in the related art.
This is particularly effective in improving comfort by reducing noise in apartment houses and the like in which a large number of hot water heaters are frequently installed.

When the tap water is opened by opening the taps 27 and 27 ', the hot water is supplied to the hot water supply heat exchanger 21 by the force of the feed water (indicated by the dashed arrow in FIG. 1) flowing through the feed pipe 26. The temperature is increased by exchanging heat with the side heat medium, and
At 27 ', the water is mixed with the water supply from the tap water supply pipe 30 (indicated by the dashed arrow in FIG. 1) to bring the water to a desired hot water temperature.

[0031]

As described above, the hot water supply apparatus of the present invention is annularly connected to a hot water supply heat exchanger having a heat transfer relationship between the heat source side heat medium and the water supply, a hot water supply outgoing pipe having a tap water tap, and a hot water supply return pipe. In addition, since the hot water return pipe is provided with a hot water circulation pump driven by the high temperature heat of the heat source side heat medium, electric construction for operating the hot water circulation pump can be reduced and practically used. Electricity costs at the time are not required, and initial costs and running costs can be reduced.

Further, since the flow rate of the heat source side heat medium for driving the hot water circulation pump is small, the flow rate of the heat source side heat medium to the hot water supply heat exchanger is small, and a stable hot water supply capacity can be guaranteed. There is also an advantage that noise is reduced and comfort is improved because no electric motor is used.

[Brief description of the 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 a hot water circulation pump according to one embodiment of the present invention.

FIG. 3 is a system configuration diagram of a conventional hot water supply apparatus.

FIG. 4 is a block diagram of a conventional hot water supply system of a hot water supply apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Hot water supply heat exchanger 22 Primary side flow path 23 Heat source side heat medium passage 24 Secondary side flow path 25 Inlet 26 Water supply pipe 27, 27 'Hot water tap 28 Hot water supply pipe 29 Outlet 31 Circulation path 32 Hot water supply return pipe 33 Hot water circulation Pump 37 Drive impeller 38 Driven fluid passage 39 Driven impeller 40 Partition wall 44 Evaporator 45 Heated fluid passage 47 Working medium circuit 48 Condenser 48a Radiator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-291428 (JP, A) JP-A-49-130046 (JP, A) JP-A-4-126924 (JP, A) 13743 (JP, A) JP-A-2-213620 (JP, A) Japanese Utility Model Application Sho 61-38415 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24D 17/00

Claims (1)

(57) [Claims] A hot water supply heat exchanger in which 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 at an inlet side have a heat exchange relationship; Of the secondary side flow path are sequentially connected in an annular manner by a hot water supply pipe and a hot water supply return pipe, and a driven impeller provided in a drive impeller and a driven fluid passage is partitioned by a partition wall. A working fluid that has a hot-water circulation pump that is air-tightly separated through and connected to transmit power, and that connects an evaporator having a heating fluid passage and a condenser having a radiator in a ring shape to change the phase of the working medium. A water heater in which the drive impeller is housed in a sealed working medium circuit, the heating fluid passage is connected to a heat source side heating medium passage, and the driven fluid passage is connected to the hot water supply return pipe.