JPS6391453A - Hot water feed system using instantaneous water heater - Google Patents

Abstract

PURPOSE:To make it possible to use a large amount of hot water of an appropriate temperature for a long time by forming a heating circulation system provided with a hot water storage vessel, for guiding hot water within the vessel to the instantaneous water heater by use of a circulation pump for heating, and after heating, returning hot water gain to the vessel. CONSTITUTION:When a power source is turned ON, a circulation pump 4 for heating operates, and water extracted from the bottom part of a hot water storage vessel 1 flows into the instantaneous water heater 5 where ignition and heating of water are carried out to heat water to a predetermined temperature, and hot water thus heated is returned to the upper part of the vessel 1. In this case, when hot water feed faucets 8 are opened, feeing of hot water is carried out at a pressure corresponding to the water feed pressure. When hot water is fed, cool water in an amount equal to that of hot water is supplemented in accordance therewith to the lower part of the hot water storage vessel 1 through a water feed pipe, and feeding of hot water is carried out continuously or intermittently, cool water is replenished, and the interface between a low-temperature zone and a high-temperature zone rises up. Thus, when a temperature adjustor 6 detects a set temperature of 37 deg.C, the circulation pump 6 for heating again operates to carry out heating circulation. In this manner, since water of a predetermined suitable temperature is held at the upper part of the hot storage vessel 1, hot water of a suitable temperature can be taken out at all times.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a hot water supply system using an instantaneous water heater suitable for large-scale houses, collective housing such as apartments, or commercial use such as cafeterias and restaurants. The device produces a large amount of hot water under high pressure.

Concerning systems that can be used for long periods of time at stable temperatures.

(Prior Art) There are two types of general water heaters: instantaneous type and hot water storage type.

Since the users of these devices are unspecified general consumers, there are limits to their performance in order to maintain safety.

For example, in the case of instantaneous type, its heat input (heat consumption) is
It is regulated to be 80.0QOkcal/II or less, and the hot water storage type near is regulated to 3B,QOQkcal/hour or less, and the hot water supply pressure is also limited to 1kg/cm' or less.

Therefore, in the instant type, for example, when the water supply temperature is 5 degrees Celsius, this water is used as hot water at 40 degrees Celsius, and 48,000 kca is used.
Even in terms of heat output per hour, at most only 23 g/min of hot water can be obtained, making it impossible to use a large flow of hot water at an appropriate temperature.
On the other hand, hot water storage systems have the disadvantage that they cannot use a large amount of hot water for a long period of time due to their low heat output, and also cannot provide a particularly comfortable shower due to the low pressure. However, it was not suitable for apartments or commercial hot water systems where hot water is used from multiple hot water taps at the same time.

Another problem with conventional hot water systems is that when hot water is not being dispensed, the hot water in the hot water supply line stagnates and gets cold, and even when the hot water tap or shower tap is opened, hot water at the appropriate temperature is not available. There was also the problem that it took a while to appear.

(Problems to be Solved by the Invention) In order to solve the problems of the prior art described above, the present invention provides a hot water storage tank and guides the hot water in the tank to an instantaneous water heater using a heating circulation pump. The purpose is to make it possible to use large quantities of hot water at an appropriate temperature for long periods of time by constructing a heating circulation system that heats the water and then returns it to nuclides.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a water supply pipe and a water supply pipe connected to the lower part of the closed hot water storage tank. Heating @ Circulation is carried out through a heating circulation pump that is controlled by a temperature controller installed at the bottom of the hot water tank, and an instantaneous water heater connected to the circulation pump. The hot water supply line outlet pipe is taken out from the top of the hot water storage tank, and the appropriate number of hot water taps, shower taps, etc. are installed at appropriate locations on the hot water supply line to make hot water available. The aim is to provide a hot water supply system using a water heater.

(Function) According to the present invention, the low-temperature water at the bottom of the tank is drawn out by the heating circulation pump from the heating circulation line connected to the bottom of the closed type hot water storage tank, and then sent to the instantaneous water heater. On the other hand, the hot water supply line is taken out from approximately above the nuclide, and an appropriate number of hot water taps and shower taps are installed at appropriate locations on the terminal. For example, when the hot water tap is opened, hot water from the high-temperature area at the top of the tank is drawn out to the hot water line by the water supply pressure due to the water supply pipe being connected to the bottom of the hot water storage tank. Hot water at an appropriate temperature is supplied at a high pressure equivalent to the water supply pressure.

When the hot water supply is connected, the hot water in the high temperature area at the top of the tank decreases, and along with this, unheated cold water is replenished from the bottom of the tank through the water supply pipe, and the low temperature area rises. , Temperature 7A is attached to the lower part of the nuclide to detect the internal water temperature, and is set to a predetermined temperature slightly lower than the suitable temperature for hot water supply.When the set temperature is detected, it is electrically connected to the temperature. The connected heating circulation pump is operated, the instantaneous water heater is turned on, and the heating circulation system is activated.
The low-temperature hot water drawn from the bottom of the tank is returned to the top of the tank as warm water at an appropriate temperature.

Through this circulation, the high-temperature water area of the nuclide descends, the temperature 31 regulator detects the predetermined temperature again, and the warming circulation pump stops.

In this way, it is possible to use hot water at a suitable temperature, large flow rate, and high pressure for a long time even with an instantaneous water heater that does not have a large heat output, thus providing a centralized hot water supply system suitable for apartments and other housing complexes. do.

Furthermore, in the present invention, the extension of the hot water supply line through the hot water tap etc. is piped back to the upper part of the hot water storage tank, and a small-sized pipe is installed in the detection port of the hot water supply line to bypass the check valve. If you install a heat-retaining circulation pump and keep it running all the time, a minimum amount of hot water at the right temperature will always circulate through the hot water system even when hot water is not being dispensed, so as soon as you open the hot water tap, hot water at the right temperature will be available. I can do it so that I can get it.

In addition, by installing an automatic air vent valve at the top of the hot water storage tank and placing the outlet for the hot water supply line slightly below it, it is possible to completely eliminate air bubbles that occur in instantaneous water heaters from entering the hot water supply line. can be prevented.

(Example) Embodiments according to the present invention will be described with reference to the illustrated system diagram.

The hot water storage tank l shall be a closed tank that can withstand at least the water supply pressure and has a volume that takes into consideration the amount of hot water used during the maximum usage time.For example, based on a shower, 3 to 5
If several shower faucets are used continuously for about 10 minutes at the same time, a volume of about 1,701 to 3,001 liters is sufficient.

Further, it is desirable that the outside of the nuclide l be kept warm with a heat insulating material l° such as glass wool or rock wool.

A water supply pipe 2 connected to a water supply facility (not shown) such as an elevated water tank, an underground water tank, or a water supply pipe, and a take-out pipe 3' of a heating circulation line 3 are connected to the bottom of the hot water storage tank 1 as described above. 3 has a heating circulation pump 4 and an instantaneous water heater 5
and connect it back to the top of the nuclide 1 to form a heating circulation system.

Furthermore, at the lower part of the hot water storage tank l, a temperature iWJ device having a regulating contact such as a liquid expansion type temperature regulator or a temperature detector 8 to which a regulator is separately connected is installed.
The heating circulation pump 4 is electrically connected to the heating circulation pump 4.

In addition, the instantaneous water heater 5 may be a normal foot heat output type instantaneous water heater if a slight variation in outlet temperature is allowed, and the amount of water is adjusted to an appropriate temperature using a circulating water amount control valve (not shown). If you want to keep the outlet temperature strictly constant, use a gas proportional control type that detects the outlet hot water temperature and feeds it back to the automatic gas flow control valve to keep the outlet temperature constant regardless of water flow fluctuations. It is best to use an instant water heater.

On the other hand, the hot water supply line 7 is taken out from a position slightly below the top of the hot water storage tank l and connected to a hot water supply pipe 9 having an appropriate number of hot water taps, shower taps, etc. 8 at appropriate locations.

The basic configuration of the system according to the present invention has been described above, and its operation will be explained first.

First, as an initial operation after system installation, the water intake valve 2'
Open the hot water tap 8...or open the air vent valve (not shown) provided at a suitable location to completely fill the system with water.

Next, open the gas valve 5° and turn on the power, but set the outlet temperature of the instantaneous water heater 5 and the temperature g1 regulator B to, for example, 43°C, and set the temperature controller 6 to a slightly lower temperature of 37°C. Set it to .

When the power is turned on, the water intake temperature is lower than the set temperature of the temperature m cylinder 6, so the contact closes and the heating circulation pump 4
is operated, water drawn from the bottom of the hot water storage tank 1 flows to the instantaneous water heater 5, where it is ignited and heated to a predetermined temperature and returned to the top of the nuclide 1.

In this temperature range, the density of the high-temperature kneaded water is low, so the warm water returned to the top does not often circulate and mix with the cold water in the lower layer, and maintains a layered state with the high-temperature region. The boundary descends as the heating cycle progresses,
The proportion occupied by the high temperature range gradually increases, and when the mounting position of the temperature controller 6 enters the high temperature range and detects the set temperature, for example 37°C, the contact opens and the heating circulation pump 4 stops, heating circulation is discontinued, and the unit is ready for use.

Here, when the hot water supply faucet 8, etc. is opened, hot water is dispensed at a high pressure equivalent to the water supply pressure because water supply pressure is applied within the system.

When hot water is dispensed, the same amount of cold water is replenished into the lower part of the hot water tank l through the water supply pipe, and hot water is dispensed continuously or intermittently to replenish the cold water. Conversely, the boundary between the low and high temperature ranges rises and the temperature controller 8
When the set temperature of 37° C. is detected, the warming circulation pump is operated again and heating circulation is performed.

In this way, by sequentially performing hot water dispensing and heating circulation, the upper part of the hot water storage tank 1 is always kept at a nearly constant temperature, so hot water at the right temperature can be taken out at any time, and hot water can be stored in the hot water storage tank 1. The hot water used in the water serves as a quantitative buffer,
Furthermore, the system has a high water supply pressure, so it can supply hot water at an appropriate temperature for a long time over a large kilometer, and can also obtain the high water pressure necessary for showers.

Further, in the above system, the extension of the hot water supply pipe 3 is piped so as to return to the upper part of the hot water storage tank l via the hot water supply return pipe 10, and a stop valve 11 is further disposed in the middle of the hot water supply line 7. If a small heat-retaining circulation 13 is arranged in the bypass pipe 12 and kept in operation at all times, a small flow of suitable temperature hot water will always flow through the hot water pipe 9 even when hot water is not being dispensed. etc. 8. It is possible to have hot water at an appropriate temperature immediately come out when the tank is opened. Another possibility is to have a valve at the top of the hot water storage tank 1 that automatically opens when the gas phase persists. If an automatic air vent valve 14 for air venting is provided and the hot water supply line 7 is taken out from a little lower part of the automatic air vent valve 14, it is advantageous that air bubbles generated in the instantaneous water heater 5 are not carried along with the hot water supply line 7.

By the way, in this embodiment, the outlet temperature of the instantaneous water heater 5 is set at around 43°C, which is the appropriate temperature for bathing, showering, etc., but suppose this is set to 60°C, and the hot water supply tap 8 is used as a hot water mixing tap. If this is the case, hot water will be supplied to the faucet, and each faucet will have
It is also possible to mix cold water as appropriate to bring the water temperature to a desired level.

In addition, the water supply pipe 2 and the heating @circling in 3 are taken out from the bottom of the hot water tank 1 on separate lines, but of course, Fig.
1, the heating circulation line 3 can be branched and taken out from the water supply pipe 2 without being taken out separately, and both terminal parts can be made common.

(Effects of the Invention) As explained above, when using the hot water supply system according to the present invention, it is possible to supply a large amount of hot water at an appropriate temperature for a long time even with an instantaneous water heater that does not have a large output. It is also suitable for apartments and other housing complexes, and the high-pressure hot water outlet is located on the shoulder, allowing for a comfortable shower.Furthermore, the heat-retaining circulation line provides hot water at the right temperature as soon as you open the hot water faucet. Take a bath.

[Brief explanation of the drawing]

The figure is a system diagram of a hot water supply system according to the present invention. ! ... Hot water storage tank 3 ... Warming circulation line 4 ... Warming circulation pump 5 ... Instantaneous water heater 6 ... Temperature tJJfrJ device 7...Hot water supply line 8...Hot water faucet, shower faucet, etc. Agent Patent attorney Yoshiyoshi Saito; Procedural amendment form) 1986 2B + Day 2 Name of invention Moment Hot water supply system using a hot water dispenser 3 Relationship with the case of the person making the amendment Patent applicant Hakusan Co., Ltd. and 2 others and 4 attorneys 5 Kotari Building, 1-6-6 Yurakucho, Chiyoda-ku, Tokyo 100 Japan Date of amendment order 1988 January 27, 2016 6 Subject of amendment

Claims (3)

[Claims] (1) A water supply pipe and a heating circulation line outlet pipe are connected to the lower part of the closed hot water storage tank, and the heating circulation line is
The piping returns to the upper part of the hot water storage tank via a heating circulation pump that is controlled by a temperature controller installed at the bottom of the hot water storage tank and an instantaneous water heater connected to the circulation pump. A hot water supply system using an instantaneous water heater, in which a hot water supply line outlet pipe is taken out from the upper part of the hot water storage tank, and an appropriate number of hot water taps, shower taps, etc. are attached to appropriate locations on the hot water supply line to enable hot water to be dispensed. (2) The hot water supply line is piped so that the extension of the hot water supply line returns to the top of the hot water storage tank as a hot water supply return pipe, and a heat retention circulation pump is installed in the piping that bypasses the check valve provided in the middle of the hot water supply line outlet pipe, and the hot water supply piping is installed. A hot water supply system using an instantaneous water heater according to claim 1, wherein hot water can be circulated through a hot water supply return pipe. (3) An automatic air vent valve is provided at the top of the hot water storage tank, and an outlet pipe end of the hot water supply line is provided at an approximately upper position below the top of the hot water storage tank. Hot water system using an instantaneous water heater.