JP4274137B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus.

Conventionally, this type of hot water heating system is equipped with a water leak detection circuit that detects a shortage of water flowing through a circuit including a heat exchanger and a radiator, and can detect a water leak while operating the hot water heating system. (For example, see Patent Document 1).

FIG. 4 shows a conventional hot water heating system described in Patent Document 1. As shown in FIG. As shown in FIG. 4, a hot water tank 51 and a water amount detector 52 are used, and a water supply (water injection) stop level sensor 53, a water supply (water injection) start level sensor 54, a water supply control valve 55 attached to the water supply line, and a heat exchanger. 56, a radiator 57, a control circuit 58, and a water supply time measurement circuit 59. The water supply time measurement circuit 59 measures the time from the water supply start level sensor 54 to the water supply stop level sensor 53. Further, the water supply (water injection) amount calculation circuit 60 calculates the water supply speed v based on the amount of water between the water supply start level sensor 54 and the water supply stop level sensor 53, records the water supply speed v, and the water supply speed v after the second time. And the water replenishment amount V is obtained from the water replenishment time.
JP-A-6-94301

  However, in the above-described conventional configuration, when the water supply control valve 55 is out of order, or when garbage is caught and the water supply control valve 55 is not completely closed, the water leak detection circuit detects a water leak. Even if it continues, water supply will continue, and there existed a subject that water would overflow from the warm water tank 51. FIG. In addition, when the opening operation is regularly performed to prevent the water supply control valve 55 that is normally closed from being stuck, water is supplied to the hot water heating system, so that the hot water tank 51 overflows. there were.

  The present invention solves the above-mentioned conventional problems, and provides a hot water supply apparatus having improved quality by improving the water supply cutoff performance when a water leak is detected in a hot water supply apparatus equipped with a hot water heating system. With the goal.

In order to solve the conventional problems, a hot water supply apparatus of the present invention includes a hot water storage tank, a water supply pipe for supplying tap water to the hot water storage tank, a water leakage detection means, a water leakage cutoff valve provided in the water supply pipe, the heating means for heating the hot water in the hot water storage tank, a primary side circulation path for circulating back the hot water from the upper portion of the hot water storage tank to re-hot water storage tank through the heat exchangers, the heat radiation and the heat exchanger unit and includes a secondary circulation route for circulating the hot water made from the hot water tank, a refill tube branched from between the hot water storage tank and the leakage cut-off valve, and a rehydration water injection valve in the middle of the auxiliary water tube, wherein the complement A hot water supply device that is connected to a water pipe and the hot water tank and that replenishes the hot water tank by opening and closing the supplementary water injection valve, and when the water supply device is not supplied with water from the tap water, Close the water leakage shut-off valve, and then It is to the Kiho water injection valve in the open state.

  As a result, when the refill water injection valve is in an open state due to a failure, or when the refill water injection valve is in a closed state due to dust being caught in the refill water injection valve, the water in the secondary circulation path overflows. However, if the water leakage detection means detects water leakage from the hot water supply device, it will not continue to leak by closing the water supply pipe with the water leakage shut-off valve, so the quality is good. Become.

In addition, when tap water is not supplied to the hot water supply device, the normally open leakage shut-off valve is closed to check the operation to prevent valve sticking, so the user is aware that hot water supply has stopped. Therefore, it is possible to prevent sticking of the water leakage shut-off valve, so that the quality can be improved without deteriorating usability.

In addition, when the water leakage shutoff valve is closed to prevent sticking, even if the water refilling valve is opened, water is not replenished to the secondary circulation path, so hot water overflows. Since there is no need to check the operation to prevent the refill water injection valve from sticking, quality can be improved without sacrificing usability.
Can be better.

  The hot water supply apparatus of the present invention connects the hot water tank of the secondary side circulation path to a supplementary water pipe branched from between the hot water storage tank and the water leakage cutoff valve, and provides a supplementary water injection valve in the middle of the supplementary water pipe. If the water injection valve is in an open state due to a failure or if the water is not completely closed because dust is caught in the refill water injection valve, the water in the secondary circulation path overflows and water leaks. However, if the water leakage detection means detects a water leak from the hot water supply device, the water supply pipe is closed by the water leakage shut-off valve, so that the water does not continue to leak, so the quality can be improved. it can.

The first invention is a hot water storage tank, a water supply pipe for supplying tap water to the hot water storage tank, a water leak detection means, a water leakage shutoff valve provided in the water supply pipe, and a heating means for heating the hot water in the hot water storage tank. When secondary circulating the primary side circulation path for circulating back the hot water from the upper portion of the hot water storage tank to re-hot water storage tank through the heat exchangers, the hot water made from the radiator means and the hot water tank and the heat exchanger and the side circulation route, a refill tube branched from between the hot water storage tank and the leakage cut-off valve, and a said auxiliary water tubes of middle refill water injection valve, with the said auxiliary water pipe and the hot water tank is connected A hot water supply device for replenishing the hot water tank by opening and closing the supplementary water injection valve, and when the hot water supply device is not supplied with water from tap water, the water leakage cutoff valve is periodically closed, and thereafter , the rehydration water injection valve in the water heater to open state That.

  As a result, if the refill water injection valve is in an open state due to a failure or if the refill water supply valve is not fully closed due to dust in the refill water supply valve, the water in the secondary circulation path overflows. However, if the water leakage detection means detects water leakage from the hot water supply device, the water supply pipe is closed by the water leakage shut-off valve, so that the water leakage does not continue. Can be better.

In addition, when tap water is not supplied to the hot water supply device, the normally open leakage shut-off valve is closed to check the operation to prevent valve sticking, so the user is aware that hot water supply has stopped. Therefore, it is possible to prevent sticking of the water leakage shut-off valve, so that the quality can be improved without deteriorating usability.

In addition, when the water leakage shutoff valve is closed to prevent sticking, even if the water refilling valve is opened, water is not replenished to the secondary circulation path, so hot water overflows. Therefore, the operation can be confirmed to prevent the refill water injection valve from sticking, so that the quality can be improved without impairing the usability.

A second invention is, in particular, in the first invention, comprises an auxiliary water detecting means for detecting a hot water shortage of the secondary circulation path, hot water of the rehydration detecting means secondary circulation channel is equal to or less than a predetermined amount when it is detected that became, it is for the rehydration water injection valve in the open state.

  As a result, by keeping the water leakage shut-off valve normally open, if the water replenishment detection means detects a shortage of hot water in the secondary circulation path, the water refilling valve can be opened at any time to replenish water. The system does not stop due to water shortage and can be used conveniently.

A third invention is, in particular, in the first or second invention, in which using a heat pump having a compressor to the heating means.

Thus, it is possible to realize a hot water supply apparatus that can save energy by adopting a heat pump type that collects atmospheric heat, and can store hot water in a hot water storage tank in a short time because a high heating capacity can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a hot water supply apparatus according to the first embodiment of the present invention.

  In FIG. 1, 1 is a hot water storage tank for storing hot water, and 2 is a water supply pipe for supplying tap water to the hot water storage tank 1. 3 is a water leakage detection means installed in the lower part of the hot water supply apparatus, 4 is a water leakage cutoff valve provided in the middle of the water supply pipe 2, and the water leakage detection means 3 is water from pipes or valves in the water supply apparatus. When a leak is detected, the water leakage shut-off valve 4 is closed to prevent water damage from spreading. Reference numeral 5 denotes a heating means for heating the hot water in the hot water tank 1. In this embodiment, the heating means is a heat pump type heating means for collecting atmospheric heat. 6 is a heat exchanger, 7 is a heat dissipation means, and 8 is a hot water tank. A primary side circulation path for circulating hot water from the upper part of the hot water tank 1 through the heat exchanger 6 to the lower part of the hot water tank 1, and the heat radiating means 7 for the hot water exchanged with the primary hot water and the heat exchanger 6. A hot water heating system comprising a secondary circulation path for circulating the hot water tank 8 is formed. 9 is a water replenishment detecting means installed in the hot water tank 8 to detect the shortage of hot water in the secondary circulation path, such as a water electrode or float switch for detecting the presence or absence of water from a liquid level sensor or water resistance value. There is. 10 is a water refilling pipe, and 11 is a water refilling water injection valve. The refill water pipe 10 branches from between the hot water tank 1 and the water leakage shutoff valve 4 and is connected to the hot water tank 8, and the refill water injection valve 11 is provided in the middle of the refill water pipe 10. A hot water supply mixing valve 12 mixes hot water in the hot water tank 1 and water in the water supply pipe 2 and supplies hot water from the currant.

  FIG. 2 is a flowchart showing a control processing procedure in the first embodiment of the present invention.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when a signal indicating no water leakage is input from the water leakage detection means 3 (No in Step 20), the water leakage cutoff valve 4 is controlled to open (Step 21). When the refill water detection means 9 determines that the hot water in the secondary circulation path is insufficient (Yes in Step 22), the refill water injection valve 11 is set to open control (Step 23), and the water is supplied through the refill pipe 10. Water is replenished to the secondary circulation path. When the replenishing water detection means 9 determines that there is sufficient hot water in the secondary circulation path (No in step 22), the refill water injection valve 11 is closed (step 24). In this way, by keeping the water leakage shutoff valve 4 normally open, when the water replenishment detection means 9 detects a shortage of hot water in the secondary side circulation path, the water replenishment water injection valve 11 can be opened at any time to replenish water. Therefore, the hot water heating system does not stop due to water shortage, and the usability can be improved.

  Next, when there is a water leak from the hot water supply device, a signal indicating that there is a water leak is input from the water leak detection means 3 (Yes in step 20), so that the water leak shut-off valve 4 is closed (step 25). . As described above, when there is a water leak from the mixing valve 12 or the hot water supply pipe, when the supplementary water injection valve 11 is in an open state, or when the supplementary water injection valve 11 is trashed, When the water is not completely closed, it is conceivable that the water in the secondary circulation path overflows and leaks. However, when the water leakage detection means 3 detects water leakage from the hot water supply device, the water leakage cutoff valve Since the water supply pipe 2 is closed by 4 to prevent the water from continuing to leak, the quality can be improved.

(Embodiment 2)
FIG. 3 is a flowchart showing a control processing procedure in the second embodiment of the present invention. Since the configuration diagram of the hot water supply apparatus is the same as the configuration diagram of the hot water supply apparatus of the first embodiment, FIG. 1 is used.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  In the present embodiment, the operation of the water leakage shutoff valve 4 and the refill water injection valve 11 is checked at 3 o'clock in the middle of the night when it is considered that the hot water is not normally supplied to prevent the valve from sticking. Specifically, first, it is checked whether or not the current time is 3:00 am (step 30). And if it is not 3:00 am (No of step 30), the water leakage cutoff valve 4 and the supplementary water injection valve 11 will perform normal control (step 31). If it is 3:00 am (Yes in Step 30), whether or not hot water is being supplied (Step 32), whether or not the water replenishment detection means 9 has detected the shortage of hot water and is controlling the opening of the water refill water injection valve 11 ( Step 33) is checked. If it is during hot water supply or supplementary water, the process proceeds to step 31 and the water leakage shutoff valve 4 and the supplemental water injection valve 11 perform normal control. If neither hot water supply nor water replenishment is performed, the process proceeds to step 34 to check whether the sticking prevention control activation flag is 1 or not. If the sticking prevention control is not being started (No in step 34), the sticking prevention control starting flag is set to 1 (step 35), and the water leakage shut-off valve forced closing timer is started (step 36). Then, after the water leakage shutoff valve 4 is closed (step 37), the water refill water injection valve 11 is opened (step 38). If the sticking prevention control activation flag is 1, step 34 proceeds to Yes, and it is checked whether or not the water leakage shut-off valve forced closing timer has overflowed (step 39). If the water leakage shut-off valve forced close timer has not overflowed (No in step 39), the process is terminated without doing anything. Therefore, the water leak shut-off valve 4 is closed during the water leak shut-off valve forced close timer count, and the refill water injection valve 11 Is open. If the water leakage cutoff valve forced closing timer overflows, the water refill water injection valve 11 is closed (step 40), and then the water leakage cutoff valve 4 is opened (step 41).

  As described above, when the tap water is not supplied to the hot water supply device, the normally open leakage shut-off valve 4 is closed to check the operation for preventing valve sticking, so that the user stops hot water supply. Without being aware of this, it is possible to prevent the water leakage shut-off valve 4 from sticking. Further, when the water leakage shutoff valve 4 is closed to prevent sticking, even if the water refill valve 11 is opened, water is not refilled into the secondary circulation path, so that water overflows. Since the operation for preventing sticking of the water refilling water injection valve 11 can be confirmed without any trouble, the quality can be improved without impairing the usability.

  As described above, the present invention is useful for controlling a hot water heating system provided with an automatic water supply means added to a hot water storage system such as an electric load or heat pump heating, a gas type, or a petroleum type.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Control flow diagram in Embodiment 1 of the present invention Control flow diagram in Embodiment 2 of the present invention Configuration diagram of a hot water heating system of a conventional example

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 3 Water leak detection means 4 Water leak shutoff valve 5 Heating means 6 Heat exchanger 7 Heat radiation means 8 Hot water tank 9 Water replenishment detection means 10 Water replenishment pipe 11 Water replenishment water injection valve 12 Hot water mixing valve

Claims (3)

A hot water storage tank, a water supply pipe for supplying tap water to the hot water storage tank, a water leakage detection means, a water leakage cutoff valve provided in the water supply pipe, a heating means for heating the hot water in the hot water storage tank, and the hot water storage tank a primary side circulation path for circulating back the hot water from the top to back the hot water storage tank through the heat exchangers, and the secondary side circulation route for circulating the hot water made from the radiator means and the hot water tank and the heat exchanger, The replenishment pipe branched from between the hot water storage tank and the water leakage shut-off valve, and a supplemental water injection valve in the middle of the supplementary water pipe, the supplementary pipe and the hot water tank are connected, and the supplementary water injection valve A hot water supply device that replenishes the hot water tank by opening and closing, and when water is not supplied from the tap water to the hot water supply device, the water leakage shut-off valve is periodically closed, and then the water refill water injection valve is water heater, characterized in that in the open state Comprising an auxiliary water detection means for detecting a hot water shortage of the secondary circulation path, when hot water of the rehydration detecting means secondary circulation channel is detected to be equal to or less than a predetermined amount, the rehydration water injection valve The hot water supply device according to claim 1 , which is in an open state. The hot water supply apparatus according to claim 1 or 2 , wherein the heating means is a heat pump having a compressor.

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