JP2007218528A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type water heater with excellent running cost, in which water in a hot water storage tank of the storage type water heater can be safely taken out in a short time by a simple operation, in the event of an emergency such as disaster or water service interruption, and easily used as living water or the like since the fear of breakage of the hot water storage tank is eliminated, and low-temperature hot water in the hot water storage tank is discharged as expanded water. <P>SOLUTION: This storage type water heater comprises the hot water storage tank, a heating means for heating hot water in the hot water storage tank, a pressure reducing valve for adjusting hot water storage pressure of the hot water storage tank, a pressure relief valve for releasing positive pressure by expanded water in the hot water storage tank, and a negative pressure breaking valve for breaking negative pressure of the hot water storage tank, in which hot water in a bottom part of the hot water storage tank is heated by the heating means and returned to an upper part of the tank. The pressure relief valve is provided in a pipe connecting the bottom part of the hot water storage tank to the heating means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water heater having a hot water storage tank such as an electric water heater or a heat pump water heater.

  In recent years, hot water storage water heaters that use midnight power to reduce running costs, such as electric water heaters and heat pump water heaters, have attracted attention. Since this hot water storage water heater stores a large amount of water in the hot water storage tank, there is a possibility of using the water in the hot water storage tank as domestic water when the water supply cannot be used in the event of a disaster or when there is a water outage. ing. For this reason, the function which can draw out and use the water in a hot water storage tank easily is calculated | required.

  FIG. 2 is an example of a hot water storage type water heater having such a function. The pressure relief valve 5 is provided in the upper part of the hot water storage tank 1, and discharges the expanded water generated as the hot water in the hot water storage tank 1 is boiled by the heat pump that is the heating device 2.

The hot water storage tank 1 has many joints such as a water supply joint 7, a hot water supply joint 8, a bath pipe forward joint 9, a bath pipe return joint 10, a heating device forward joint 11, and a heating device return joint 12. The water in the hot water storage tank 1 can be taken in by opening the emergency faucet 13 of the heating device forward joint 11 connected to the bottom of 1.
Japanese Patent Laid-Open No. 3-117853

  However, the connection joint portion of the hot water storage tank 1 is subjected to heat insulation work in order to prevent freezing and improve the heat insulation performance. Therefore, the operation of the emergency faucet 13 arranged in the heating device forward joint 11 does not perform any special construction. As difficult as possible.

  Further, the water in the hot water storage tank 1 is not replaced with air simply by opening the emergency water tap 13, so that water cannot be taken. At the time of water intake, the pressure relief valve 5 disposed at the upper part of the hot water storage tank 1 is opened, for example. Care must be taken to introduce air into the tank 1 and its operation is necessary. If water is continuously taken from the emergency tap 13 without performing these operations, the hot water storage tank 1 becomes negative pressure, and in the worst case, the hot water storage tank 1 may be damaged. A general user who uses the hot water in the hot water storage tank 1 at the time of a disaster may not know the necessity of such caution itself or the operation method of the emergency water tap 13.

  Further, when using a pressure relief valve 16 having a negative pressure breaking function (hereinafter referred to as “pressure relief valve 16 with a negative pressure function”), the hot water storage tank 1 can be prevented from being damaged. Since the amount of air taken in from the pressure relief valve with pressure function is small, the water intake speed from the emergency faucet 13 can be obtained only about 5 l / min, and in order to use the water in the hot water storage tank 1 as domestic water, There is a problem that taking water takes time and usability is insufficient.

  Furthermore, in the conventional configuration, the pressure relief valve 5 and the pressure relief valve 16 with a negative pressure function are provided at the upper part of the hot water storage tank 1, so that when the expansion water is generated, the hot water at the upper part of the hot water storage tank 1 is discharged. The Here, since the hot water boiled by the heating device 2 is stored from the upper portion of the hot water storage tank 1, hot water is stored in the upper portion of the hot water storage tank 1, and low temperature hot water is stored in the lower portion. For this reason, high-temperature hot water is discharged as the expanded water, and there is a problem that the running cost is reduced accordingly.

  Therefore, in the event of an emergency such as a disaster or water outage, the present invention can safely take water in a hot water storage tank of a hot water storage hot water in a short time with a simple operation, and there is no fear of the hot water storage tank being damaged. An object of the present invention is to provide a hot water storage type water heater that is easy to use as domestic water. It is another object of the present invention to provide a hot water storage type hot water heater that is excellent in running cost by discharging low temperature hot water in a hot water storage tank as expanded water.

The present invention solves the above problems by the following configuration.
(1) A hot water storage tank, heating means for heating the hot water in the hot water storage tank, a pressure reducing valve for adjusting the hot water storage pressure of the hot water storage tank, a pressure relief valve for releasing positive pressure due to the expanded water in the hot water storage tank, A hot water storage water heater having a negative pressure release valve for breaking the negative pressure of the hot water storage tank and heating the hot water at the bottom of the hot water storage tank to the upper part of the hot water tank by the heating device, wherein the pressure relief valve is A hot water storage type hot water heater provided in a pipe connected from the bottom of the hot water storage tank to the heating means.
(2) The hot water storage type hot water heater according to item (1), wherein the negative pressure release valve is provided in an upper part of the hot water storage tank.
(3) A hot water storage type hot water heater according to item (1) or item (2), wherein the heating means is a heat pump.

  According to the first aspect of the present invention, since the pressure relief valve is provided at the bottom of the hot water storage tank, the pressure relief valve can be used as a water intake for taking hot water from the hot water storage tank. Since the pressure relief valve is exposed without being covered with a heat insulating material so as to be easily inspected, the opening / closing operation at the time of water intake can be facilitated. Further, since the expanded water is discharged from the bottom of the hot water storage tank, it is not necessary to discharge the hot water, and the running cost is improved.

  According to the invention described in claim 2, when the negative pressure destruction valve is provided at the upper part of the hot water storage tank, when taking hot water from the hot water storage tank, an operation for introducing air into the hot water storage tank becomes unnecessary. By operating the pressure relief valve, water can be taken from the hot water storage tank. In addition, since the air intake amount of the negative pressure release valve is large, the water intake speed from the emergency faucet is sufficient to use the water in the hot water storage tank as domestic water, and the usability is improved.

  According to the third aspect of the present invention, when a heat pump is used as a hot water heating device for storing hot water in the hot water storage tank, a hot water storage type hot water heater having excellent running cost can be provided.

  An example of the hot water storage type water heater of the present invention is shown in FIG.

  The heating device 2 used in the present invention is not particularly limited as long as the hot water in the hot water storage tank 1 can be heated, and a heat pump, an electric heater, or a water heater using the combustion heat of gas or kerosene is used. it can. A heat pump type heating device is desirable because it can use midnight power and has high thermal efficiency. In addition, when using a heat pump, since the refrigerant | coolant used with a heat pump can store high temperature hot water, carbon dioxide gas is desirable.

  In the heat pump, the water taken in from the hot water storage tank 1 is heated by the heat pump and then returned to the hot water storage tank 1. Preferably, the water taken in from the lower part of the hot water storage tank 1 is heated by a heat pump and then supplied from the upper part of the hot water storage tank 1. By doing in this way, the low temperature hot water in the lower part of the hot water storage tank 1 is supplied to the heat pump and returned to the upper part at a high temperature, so that hot water is supplied from the upper part of the hot water storage tank 1 and lower temperature hot water is supplied to the lower part. Hot water can be stored as hot water at different temperatures. Moreover, since hot water and low-temperature hot water are not easily mixed, they do not become half-warm hot water, so hot water can be used as hot water at a desired temperature with a heat source or a mixing tap. On the other hand, in the heat pump type heating apparatus, the efficiency at the time of boiling can be improved by using the low-temperature hot water at the bottom of the hot water storage tank 1.

  The hot water storage tank 1 stores hot water heated by the heating device 2 and is not particularly limited in material, shape, capacity, and the like. Stainless steel, which is usually used as the hot water storage tank 1 of the hot water storage type hot water heater, has a cylindrical shape and a capacity of 300 l, 370 l, 460 l or the like can be used. Moreover, it is desirable to arrange a heat insulating material around the hot water storage tank 1.

  A water supply pipe connected to the hot water storage tank 1 is connected to the water supply joint 7, and a pressure reducing valve 4 for adjusting the hot water storage pressure in the hot water storage tank 1 is provided. The hot water supply pipe is connected to the hot water supply joint 8 and sends hot water in the hot water storage tank to the hot water tap. The bath circulation channel is a circulation channel between the hot water storage tank 1 and the bath 3, and is connected to the bath piping forward joint 9 and the bath piping return joint 10. The heating circulation channel is a circulation channel between the hot water storage tank 1 and the heating device 2, and is connected to the heating device forward joint 11 and the heating device return joint 12. Each joint of the hot water storage tank 1 connecting these pipes is arranged near the bottom of the hot water storage tank 1.

  The pressure relief valve 5 discharges the expanded water generated when boiling the hot water in the hot water storage tank 1 with a heating device, and also serves as a water intake when the hot water in the hot water storage tank 1 is used in a disaster or the like. The pressure relief valve 5 is attached so that hot water at the bottom of the hot water storage tank 1 can be drained. As a result, hot water having a temperature lower than that of the upper portion is stored in the lower part of the hot water storage tank 1, so that the low temperature hot water is discharged as expansion water, and the running cost is improved.

  The attachment position of the pressure relief valve 5 is not limited as long as the hot water at the bottom of the hot water storage tank 1 can be drained. Although it may be directly provided at the bottom of the hot water storage tank 1, it is preferably provided in a connected pipe. For example, it is desirable to provide in the middle of the piping connected from the bottom of the hot water storage tank 1 to the heating device forward joint 11 and upstream of the circulation pump 14. Thereby, the pressure relief valve 5 can be provided at a position where it can be easily operated by drawing the pipe.

  Since the low temperature hot water in the hot water storage tank 1 is supplied to the heating device 2, the pipe connected from the hot water storage tank 1 to the heating device forward joint 11 is connected to the bottom of the hot water storage tank 1. If low temperature water is attached, low temperature hot water at the bottom of the hot water storage tank 1 can be discharged as expanded water. Moreover, if it is upstream from the circulation pump 14, the pressure by the expansion water in the hot water storage tank 1 will be easily transmitted to the pressure relief valve 5, and discharge | emission of expansion water will become easy.

  Moreover, since the heating device forward joint 11 is usually provided near the exterior 15 of the hot water storage tank 1 or so as to jump out of the exterior 15, the pipe connected to the heating device forward joint 11 from the bottom of the hot water storage tank 1 is connected to the hot water storage tank 1. Therefore, if an inspection window for inspecting the pressure relief valve 5 is provided, it is easy to reach and easy to perform inspection and opening / closing operations. For this reason, even when using as domestic water at the time of a disaster etc., if the inspection window is opened, the pressure relief valve 5 can be easily opened and closed.

  The piping of the circulating water channel between the hot water storage tank 1 and the superheater 2 is generally installed on the ground, unlike the water supply piping and drainage piping which are underground. For this reason, since the piping connected from the bottom of the hot water storage tank 1 to the heating device forward joint 11 is routed at a relatively high position from the ground, when the pressure relief valve 5 is attached to this piping, the piping is positioned at a relatively high position. Since it is not necessary to bend down and search for the operating portion of the pressure relief valve 5, the operation of the pressure relief valve 5 is easy.

  The pressure relief valve 5 can also be provided in a pipe connected from the water supply joint 7 to the bottom of the hot water storage tank 1. However, as described above, in this case, since the pipe from the underground is received, the water supply joint 7 Is located near the ground and is usually connected to the bottom of the hot water storage tank 1 as it is. For this reason, in order to make the pressure relief valve 5 easy to operate, it is necessary to route the pipe to a higher position, which takes time for the pipe and increases the installation cost. Therefore, it is desirable to install the pressure relief valve 5 in a pipe connected from the bottom of the hot water storage tank 1 to the heating device forward joint 11.

  The pressure relief valve 5 has a structure for discharging the expanded water when boiling the hot water in the hot water storage tank 1 by the heating device 2. For this reason, it is desirable to provide a pipe from the pressure relief valve 5 so as to flow into the drainage groove or a storage tank for secondary use so that the discharged expanded water is easily drained. Thereby, the discharged expanded water is discharged smoothly, or is stored in a tank for secondary use, and can be used for secondary use. On the other hand, when it is used as water for daily life in the event of a disaster, the outlet of the piping should be variable or flexible so that water can be taken at a somewhat high position so that it can be easily taken. desirable.

  The negative pressure release valve 6 introduces air to eliminate the negative pressure because negative pressure is generated in the hot water storage tank 1 as hot water is discharged when hot water is taken from the hot water storage tank 1. The hot water storage tank 1 is prevented from being damaged. When water is taken in from the hot water storage tank 1, the negative pressure release valve 6 is used to introduce air into the hot water storage tank 1 so that air can be taken in at the time of water intake. Even if there is no need to secure the mouth and the user has not recognized the need for negative pressure destruction, the hot water storage tank 1 is not damaged and safety can be ensured.

  Since the negative pressure release valve 6 has a large air intake amount, the water intake speed from the pressure relief valve 5 can be sufficient to use the water in the hot water storage tank 1 as domestic water, and the usability is improved. It is desirable for convenience that the air intake amount is about 10 l / min or more.

  The position of the negative pressure release valve 6 is not limited as long as air can be introduced when taking water from the hot water storage tank 1, but the hot water storage tank 1 is normally used in a full state. The top is desirable. Thereby, even when the hot water storage tank 1 is full, the hot water in the hot water storage tank 1 can be introduced into the hot water storage tank 1 without resistance.

  An embodiment of the hot water storage type water heater of the present invention is shown in FIG.

  In the present embodiment, a heat pump using a carbon dioxide refrigerant is used as the heating device 2. As a result, late-night power can be used, heat efficiency is high, and hot water can be boiled at a high temperature.

  In the heat pump, the water taken in from the bottom of the hot water storage tank 1 is heated by the heat pump and then returned from the upper part of the hot water storage tank 1. As a result, the low temperature hot water at the bottom of the hot water storage tank 1 is supplied to the heat pump and returned to the upper part at a high temperature, so that hot water from the upper part of the hot water storage tank 1 and low temperature hot water from the lower part have different temperatures. Hot water can be stored as a hot water layer. In the hot water storage tank 1, since hot water and low temperature hot water are not easily mixed, they do not become half-warm hot water, so that hot water can be used as hot water at a desired temperature with a heat source or a mixing tap. On the other hand, in the heat pump type heating device, by using the low-temperature hot water at the bottom of the hot water storage tank 1, the efficiency at the time of boiling can be improved.

  The hot water storage tank 1 is a stainless steel cylinder having a capacity of 370 l.

  A water supply pipe connected to the hot water storage tank 1 is connected to the water supply joint 7, and a pressure reducing valve 4 for adjusting the hot water storage pressure in the hot water storage tank 1 is provided. The hot water supply pipe is connected to the hot water supply joint 8 and sends hot water in the hot water storage tank to the hot water tap. The bath circulation channel is a circulation channel between the hot water storage tank 1 and the bath 3, and is connected to the bath piping forward joint 9 and the bath piping return joint 10. The heating circulation channel is a circulation channel between the hot water storage tank 1 and the heating device 2, and is connected to the heating device forward joint 11 and the heating device return joint 12. Each joint of the hot water storage tank 1 connecting these pipes is arranged near the bottom of the hot water storage tank 1.

  The pressure relief valve 5 is provided in the middle of the pipe connected from the bottom of the hot water storage tank 1 to the heating device forward joint 11 and upstream of the circulation pump 14. Thereby, the low temperature hot water of the bottom part of the hot water storage tank 1 can be discharged as expansion water. Moreover, since it is upstream from the circulation pump 14, the pressure by the expansion water in the hot water storage tank 1 is easily transmitted to the pressure relief valve 5, and the discharge of the expansion water is facilitated.

  The heating device forward joint 11 is provided so as to jump out of the exterior 15 of the hot water storage tank 1. Further, the piping connected from the bottom of the hot water storage tank 1 to the heating device forward joint 11 is drawn out to the vicinity of the exterior 15 of the hot water storage tank 1, and an inspection window for inspecting the pressure relief valve 5 is provided in the nearby exterior 15. Thereby, it is easy to reach by simply opening the inspection window, and inspection and opening / closing operations are also easy. For this reason, even when using as domestic water at the time of a disaster etc., if the inspection window is opened, the pressure relief valve 5 can be easily opened and closed.

  The height at which the pressure relief valve 5 is installed is about 600 mm from the ground. Accordingly, it is not necessary to bend down and search for the operating portion of the pressure relief valve 5, so that the operation of the pressure relief valve 5 is easy.

  The pressure relief valve 5 is attached with flexible piping, and its outlet is dropped into the drainage groove. Thereby, expansion water is discharged | emitted smoothly. On the other hand, when it is used as domestic water in the event of a disaster or the like, water intake is easy by dropping the outlet of the flexible pipe into the bucket or the opening of a plastic tank.

  The negative pressure release valve 6 is installed at the top of the hot water storage tank 1 with an air intake of 10 l / min. As a result, there is no need to secure an air intake port in order to take in air and destroy negative pressure during water intake, even if the user did not recognize the necessity of negative pressure destruction. The hot water storage tank 1 is not damaged, and safety can be ensured. The water intake speed from the pressure relief valve 5 can be sufficient to use the water in the hot water storage tank 1 as domestic water, and the usability is improved. Further, even when the hot water storage tank 1 is full, the hot water in the hot water storage tank 1 can be introduced without causing resistance.

It is a block diagram of the hot water storage type hot water heater in the Example of this invention. It is a block diagram of the hot water storage type water heater which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank 2 ... Heating device 3 ... Bath 4 ... Pressure-reducing valve 5 ... Pressure relief valve 6 ... Negative pressure destruction valve 7 ... Water supply joint 8 ... Hot water supply joint 9 ... Bath piping forward joint 10 ... Bath piping return joint 11 ... Heating device Outward joint 12 ... Heating device return joint 13 ... Emergency faucet 14 ... Circulation pump 15 ... Exterior 16 ... Pressure relief valve with negative pressure destruction function

Claims (3)

A hot water storage tank,
Heating means for heating the hot water in the hot water storage tank;
A pressure reducing valve for adjusting the hot water storage pressure of the hot water storage tank;
A pressure relief valve that relieves positive pressure from the expanded water in the hot water storage tank;
A negative pressure release valve for breaking the negative pressure of the hot water storage tank,
In the hot water storage type hot water supply apparatus, the hot water at the bottom of the hot water storage tank is heated by the heating device and returned to the upper part of the hot water tank.
A hot water storage type hot water supply apparatus in which the pressure relief valve is provided in a pipe connected from the bottom of the hot water storage tank to the heating means.   The hot water storage type water heater according to claim 1, wherein the negative pressure breaking valve is provided in an upper part of the hot water storage tank. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the heating means is a heat pump.

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