JP3211368B2 - 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 circulating 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 circulating pump. There were challenges.

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]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for exchanging heat between a primary flow path connected to a heat source side heat medium passage and a secondary flow path connecting an inlet side to a water supply pipe. The hot water supply heat exchanger and the outlet of the secondary side flow path, the tap, the inlet of the secondary side flow path, sequentially having a circulation path connected in a ring with a hot water supply pipe and a hot water supply return pipe, A hot impeller circulating pump in which a driving impeller provided in the driving-side fluid passage and a driven impeller provided in the driven-side fluid passage are connected so that power can be transmitted; The driven-side fluid passage is inserted and connected to the hot-water supply return pipe.

[0011]

According to the present invention, the hot water circulation pump is driven by the flowing force of the heat medium on the heat source side to circulate the hot water in the circulation path, and is heated by the hot water heat exchanger to heat the hot water in the hot water supply pipe. It is intended to prevent water from dropping and to realize a hot water property in which hot water flows out as soon as the tap is opened.

[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, 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 to an inlet 25 at 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 '. And
The taps 27, 27 'are connected to hot water supply connection ports 27a, 27a'.
Is connected to an outlet 29 of the secondary flow path 24 by a hot water supply pipe 28. Reference numeral 30 denotes a tap water supply pipe, and a water supply connection port 2
7c, 27c '. 31 is a hot water supply pipe 28
And a circulation path circularly connected by a hot water supply return pipe 32 that connects the end of the secondary side flow path 24 and the inlet 25 of the secondary side 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 FIG. Reference numeral 37 denotes a drive impeller provided in the drive-side fluid passage 38, and reference numeral 39 denotes a driven impeller provided in the driven-side fluid passage 40. Reference numeral 41 denotes a cylindrical drive-side magnet integrally attached to the drive impeller 37 via a holder 42. Reference numeral 43 denotes a position provided opposite to the drive-side magnet 41 and integrally attached to the driven impeller 39. The driven magnet 44 is a partition that partitions between the driving magnet 41 and the driven magnet 43 and hermetically separates between the driving fluid passage 38 and the driven fluid passage 40. Reference numeral 45 denotes a drive rotation shaft that makes the drive impeller 37 rotatable. One end is supported by a bearing 46 provided in a concave portion of the partition wall 44, and the other end is supported by a bearing 48 provided in a drive side casing 47. 4
Reference numeral 9 denotes a driven rotary shaft that makes the driven impeller 39 rotatable. One end of the driven rotary shaft is supported by a bearing 50 provided in a concave portion of the partition wall 44, and the other end is supported by a bearing 52 provided on a driven casing 51.

The driving impeller 37 and the driven impeller 39 are connected by a magnetic force by a driving magnet 41 and a driven magnet 43 so that power can be transmitted.

Reference numerals 53 and 54 denote a drive-side fluid inlet and a drive-side fluid outlet provided on the inlet and outlet sides of the drive-side fluid passage 38, respectively. 55 and 56 are driven fluid passages 40
, A driven fluid inlet and a driven fluid outlet provided on the inlet side and the outlet side, respectively.

Reference numeral 57 denotes an ejection hole provided in the drive-side fluid passage 38 upstream of the drive impeller 37. The hot water circulation pump 33 is configured as described above, the drive side fluid passage 38 is inserted and connected to the downstream side of the hot water supply heat exchanger 21 of the heat source side heat medium passage 23, and the driven side fluid passage 40 is connected to the hot water return pipe 32. The hot water supply device for each dwelling unit is inserted and connected upstream of the check valve 34.

In the above configuration, the hot water circulation pump 33 is configured such that the heat medium (indicated by a white arrow in FIGS. 1 and 2) flowing through the heat source side heat medium passage 23 is introduced into the drive side fluid passage 38 and the ejection hole 5 is formed.
7 squirts toward the drive impeller 37 to drive the impeller 3
7 is rotated and flows out from the drive side fluid outlet 54. The rotation of the driving impeller 37 causes the driving magnet 41 to rotate, and the driven magnet 43 coupled to the driving magnet 41 by magnetic force causes the driven impeller 39 to rotate. That is, the driven impeller 39 of the hot water circulation pump 33 is driven and rotated by the flowing force of the heat source side heat medium, and the rotation of the driven impeller 39 generates a pump action to supply hot water in the circulation path 31. Are circulated (indicated by solid arrows in FIGS. 1 and 2), and the temperature of the hot water in the hot water supply pipe 28 is maintained by heating and raising the temperature in the hot water supply heat exchanger 21 with the high-temperature heat source side heat medium.

For this reason, when the tap 27 is opened, the hot water immediately rises into the hot water supply connection port 27a, so that the hot water can be immediately discharged from the tap hole 27c, and the quick hot water property can be secured.

Further, since the pump is driven by the fluid force of the heat source side heat medium, the cost of electricity required in the conventional electric motor drive system is not required, so that the running cost is reduced. In a house or the like, it is a piping space for each house, and there is no need for electrical work on the pipe shaft where the hot water supply device is to be installed. In addition, since noise that has been conventionally generated by the rotation of the electric motor is eliminated, the noise can be reduced. Therefore, in a multi-dwelling house where a large number of hot water heaters are installed in a concentrated manner, it is particularly effective in improving comfort by reducing the noise. .

Further, the driving impeller 37 and the driven impeller 39
Are not connected directly on the same shaft, but as a magnetic coupling by magnetic force, both the heat source side heat medium and the hot water can be separated airtightly by the partition wall 44, and the mixing of the heat medium into the hot water can be prevented, so that it is hygienic and safe. Device can be realized.

When the hot water is supplied 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 water (indicated by the dashed arrow in FIG. 1) flowing through the water supply 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.

As described above, in this embodiment, the hot water circulation pump 33
Although the drive side fluid passage 38 of FIG. 1 is connected in series to the outlet side of the primary side flow path 22 of the hot water supply heat exchanger 21, the same effect can be obtained by connecting the drive side fluid passage 38 to the inlet side. Vessel 21
It is the same even if they are provided in parallel.

[0025]

As described above, in the hot water supply apparatus of the present invention, a hot water supply heat exchanger and a hot water tap having a heat transfer relationship between a heat source side heat medium and water supply are connected in an annular manner by a hot water supply pipe and a hot water supply return pipe. At the same time, the hot water return pipe is provided with a hot water circulation pump that uses the fluid force of the heat source side heat medium as a drive source, so that electrical work for operating the hot water circulation pump can be reduced and the actual work time can be reduced. Electricity is unnecessary, and initial costs and running costs can be reduced.

In addition, there is also an advantage that noise is reduced and comfort is improved because a motor as a noise source is not 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 in the apparatus.

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 Drive-side fluid passage 39 Driven impeller 40 Driven-side fluid passage

──────────────────────────────────────────────────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] 1. A primary flow path connected to a heat source side heat medium passage,
A hot water supply heat exchanger having a heat exchange relationship with a secondary flow path communicating with a water supply pipe at an inlet side, and an outlet of the secondary flow path, a hot water tap,
While having a circulation path in which the inlet of the secondary side flow path is sequentially connected by a hot water supply pipe and a hot water supply return pipe, a drive impeller provided in a drive side fluid passage and a driven impeller provided in a driven side fluid passage are provided. Has a hot water circulation pump connected to enable power transmission,
A hot water supply apparatus wherein a drive side fluid passage of the hot water circulation pump is inserted and connected to the heat source side heat medium passage, and a driven fluid passage is inserted and connected to the hot water supply return pipe.