JP6561312B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus having a reheating function.

  Conventionally, this type of hot water supply apparatus has a function of a reheating operation for heating hot water in a bathtub (see, for example, Patent Document 1).

  FIG. 3 shows a hot water supply apparatus having a chasing operation as a function, a hot water storage tank 1, a water supply pipe 2 connected to the bottom of the hot water storage tank 1, a drain pipe 3 connected to the bottom of the hot water storage tank 1, A relief valve 16 connected to the hot water tank 1, a drain plug 4 connected to the drain pipe 3, a heat pump unit 5 as a heating means for heating the water in the hot water tank 1, and water from the heat pump unit 5 to the hot water tank Heat exchanger configured to exchange heat between the three-way valve 6 for leading to the bottom of the hot water tank 1 or the top of the hot water tank 1, the bathtub 7 to be reheated, and the water in the hot water tank 1 The device 8 is configured.

  The hot water supply apparatus includes a bathtub water circulation pipe 9 that connects the bathtub 7 and the heat exchanger 8, a bathtub water conveyance pump 10 that conveys the water of the bathtub 7 to the heat exchanger 8, the top of the hot water tank 1, and hot water storage. A hot water tank heat exchanger connection pipe 12a connecting the tank 1 side face, a heat exchanger pump pipe 12b connecting the hot water tank water transfer pump 11, a hot water tank water transfer pump 11, and the hot water tank 1 side face. The reheating circuit 12 includes a pump hot water tank pipe 12 c to be connected, a boiling pump 13, a reheating circuit drain pipe 22, and a reheating circuit drain plug 23.

  During the reheating operation, the bathtub water conveyance pump 10 and the hot water tank water conveyance pump 11 operate, and the water in the hot water tank 1 and the water in the bathtub 7 are heat-exchanged.

JP 2013-181709 A

  However, in the above-described conventional configuration, when draining the equipment, water cannot be drained from the reheating circuit only by draining the hot water tank 1, and the reheating circuit provided in the reheating circuit for draining the reheating circuit. It had the subject that it had to operate the pipe drain plug additionally.

  This invention solves the said conventional subject, and it aims at providing the hot water supply apparatus with high usability which can drain water from a reheating circuit only by draining operation of a hot water storage tank.

In order to solve the above-described conventional problems, a hot water supply apparatus of the present invention includes a heating means, a hot water storage tank for storing hot water heated by the heating means, and heat exchange for heating water in a bathtub with hot water in the hot water storage tank. A recirculation circuit for circulating hot water in the hot water tank through the heat exchanger, a drain pipe for draining water in the hot water tank, a drain plug connected to the drain pipe, and the hot water storage A relief valve disposed at the top of the tank, and a drainage channel for draining the water in the reheating circuit to the drain pipe, the drainage channel is configured to allow water at the bottom of the hot water storage tank to flow. , Provided by utilizing a part of the flow path conveyed to the heating means through the drain pipe, and by simply opening the drain plug and the relief valve, The water flows from the drainage channel to the drainage pipe, drains the water in the hot water tank and the water in the reheating circuit. And water, is characterized in that it has a configuration that can be done from the drain pipe.

  Thereby, at the time of draining the equipment, it is possible to drain water from the reheating circuit only by draining the hot water tank, and it is possible to provide a hot water supply device that can be easily drained.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water supply apparatus with high usability which can drain water from a reheating circuit only by draining operation of a hot water tank can be provided.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Cross section of the check valve Configuration diagram of conventional hot water supply equipment

The first invention includes a heating means, a hot water storage tank for storing hot water heated by the heating means, a heat exchanger for heating water in a bathtub with hot water in the hot water storage tank, and hot water in the hot water storage tank. A reheating circuit that circulates through a heat exchanger, a drain pipe that drains the water in the hot water storage tank, a drain plug connected to the drain pipe, and a relief valve that is disposed above the hot water tank. A drainage channel for draining water in the reheating circuit to the drainage pipe, and the drainage channel allows water at the bottom of the hot water storage tank to pass through the drainage pipe to the heating means. It is provided by using a part of the flow path to be transported, and the water of the reheating circuit flows from the drain flow path to the drain pipe only by opening the drain plug and the relief valve. The drainage of the water in the hot water storage tank and the drainage of the water in the reheating circuit can be performed from the drain pipe. A hot water supply device, characterized in that configuration and the.

  Thereby, at the time of draining the equipment, it is possible to drain water from the reheating circuit only by draining the hot water tank, and it is possible to provide a hot water supply device that can be easily drained.

  According to a second aspect of the present invention, in the first aspect of the invention, the water drainage channel includes a backflow prevention means for preventing a flow of water from the drain pipe side to the reheating circuit side. It is.

Thereby, water can be drained from the reheating circuit only by draining the hot water tank when draining the equipment while maintaining the boiling performance .

Therefore, it is possible to provide a hot water supply device that can be easily drained .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water supply apparatus according to Embodiment 1 of the present invention.

  In FIG. 1, a hot water tank 1, a water supply pipe 2 connected to the bottom of the hot water tank 1, a drain pipe 3 connected to the bottom that is the lower part of the hot water tank 1, and a drain plug 4 connected to the drain pipe 3. And a heat pump unit 5 as a heating means for heating the water in the hot water tank 1, and water from the bottom of the hot water tank 1 is conveyed and heated to the heat pump unit 5 through the drainage pipe 3, and again the hot water tank 1. The boiling pump 13 for transporting to the top which is the top of the hot water and the hot water transported from the heat pump unit 5 by the boiling pump 13 to the bottom which is the lower part of the hot water tank 1 or the top which is the upper part of the hot water tank 1 It comprises a three-way valve 6 for guiding, a bathtub 7 to be reheated, and a heat exchanger 8 configured to exchange heat between the water in the bathtub 7 and the water in the hot water tank 1.

  The hot water supply apparatus heats the water in the hot water tank 1, the bathtub water circulation pipe 9 that connects the bathtub 7 and the heat exchanger 8, the bathtub water conveyance pump 10 that conveys the water in the bathtub 7 to the heat exchanger 8. The hot water storage tank water conveyance pump 11 for conveying to the exchanger 8 is comprised.

  Moreover, the top of the hot water tank 1, a hot water tank heat exchanger connection pipe 12 a that connects the heat exchanger 8, a heat exchanger pump pipe 12 b that connects the heat exchanger 8 and the hot water tank water transport pump 11, and hot water in the hot water tank A reheating circuit 12 comprising a transfer pump 11 and a pump hot water tank pipe 12c connecting the side surfaces of the hot water tank 1 is provided.

  The pump hot water tank pipe 12 c is connected to the side surface of the hot water tank 1 at a position higher than the substantially lowermost part of the reheating circuit 12.

  Furthermore, a reheating check valve pipe 14a connecting the pump hot water tank pipe 12c and the check valve 15, a check valve heating pump pipe 14b connecting the check valve 15 and the boiling pump 13, and the boiling pump 13 , A drainage pipe 14 composed of a boiling pump drain pipe 14c for connecting the drain pipe 3 is provided.

  Further, the drain pipe 14 uses a pump drain pipe 14 c which is a part of a flow path for transporting water from the bottom of the hot water tank 1 to the heat pump unit 5 through the drain pipe 3.

  The check valve 15 installed in the drain pipe 14 serves as a backflow prevention means described later.

  That is, when the drain pipe 14 opens the drain valve 4 and the relief valve 16 disposed at the top of the hot water tank 1, the drain path through which water flows from the reheating circuit 12 to the drain pipe 3. Plays the role of

  Further, the reheating check valve pipe 14 a is connected to the piping constituting the reheating circuit 12, and the connecting portion is substantially the lowermost part of the reheating circuit 12.

  The boiling pump 13 may be configured not to be connected to the check valve boiling pump pipe 14b and the boiling pump drain pipe 14c as long as the boiling function of the heat pump unit 5 is operated. 5 is also possible.

  During the reheating operation, the bathtub water conveyance pump 10 and the hot water tank water conveyance pump 11 operate, and the water in the hot water tank 1 and the water in the bathtub 7 are heat-exchanged. Here, the high-temperature water that has come out from the top of the hot water storage tank 1 of the reheating circuit 12 is heat-exchanged with the water in the bathtub 7 by the heat exchanger 8, and returns to the side surface or bottom of the hot water storage tank 1.

  During the boiling operation, water at the bottom of the hot water tank 1 heated by the heat pump unit 5 is supplied to the top of the hot water tank 1 by the boiling pump 13.

  When the hot water is discharged, hot water is discharged from the hot water piping 17 disposed at the top of the hot water tank 1, and the same amount of hot water as the hot water is supplied from the water supply pipe 2 disposed at the bottom of the hot water tank 1.

  Due to the hot water operation, the water temperature at the top of the hot water tank 1 becomes higher than the bottom of the hot water tank 1, and a temperature gradient is generated in the hot water tank 1.

  When there is no backflow prevention means in the drain pipe 14, convection occurs due to the temperature gradient, and it is constituted by the top of the hot water tank 1, the reheating circuit 12, the drain pipe 14, the drain pipe 3, and the bottom of the hot water tank 1. In the route, water flows from the top of the hot water tank 1 to the bottom of the hot water tank 1 through the reheating circuit 12, the drain pipe 14 and the drain pipe 3.

  If the water at the top of the hot water storage tank 1 is mixed with the water at the bottom of the hot water storage tank 1, the water temperature at the bottom of the hot water storage tank 1 rises, and the boiling performance of the heat pump unit 5 decreases.

  In this configuration, a check valve 15 serving as a backflow prevention means is disposed in the drain pipe 14, and the top of the hot water tank 1, the reheating circuit 12, the drain pipe 14, the drain pipe 3, and the bottom of the hot water tank 1. Since the convection does not occur when the path constituted by is interrupted, the water at the top of the hot water tank 1 does not flow into the bottom of the hot water tank 1 and the water temperature at the bottom of the hot water tank 1 does not rise, so the heat pump unit 5 A decrease in the boiling performance of is prevented.

  Further, when the drain plug 4 connected to the drain pipe 3 and the relief valve 16 are opened at the time of draining the equipment, the water in the reheating circuit 12 is not drained and the drain pipe 14 The water is drained through the drain pipe 3.

  The check valve 15 whose sectional view is shown in FIG. 2 is an example of a backflow prevention means. The valve body 18 includes a valve rod 19 attached to the inside of the valve body 18, a spring 20, and a rubber packing 21 attached to the tip of the valve rod 19.

  The check valve 15 has a leakage prevention performance of a differential pressure of 0.01 MPa or less and a leak amount in the reverse direction of 100 mL / min.

  If this leakage prevention performance is satisfied, the check valve 15 can be configured without using the rubber packing 21.

  The valve rod 19 is pressed against the valve seat of the valve body 18 by the spring 20 except during the drainage, including the time of retreat, and the check valve 15 is closed. However, when the water pressure from the forward direction inside the valve body 18 exceeds the water pressure from the reverse direction, the spring 20 contracts, and a gap is formed between the valve rod 19 and the valve seat portion of the valve body 18, so that the check valve 15 is Opened.

  The check valve 15 is installed with the direction from the reheating circuit 12 toward the drain pipe 3, that is, the bottom of the hot water tank 1, as the forward direction.

  Since the check valve 15 is in a closed state as described above except during draining, it is composed of the top of the hot water tank 1, the reheating circuit 12, the drain pipe 14, the drain pipe 3, and the bottom of the hot water tank 1. This route is blocked by a check valve 15 disposed in the drain pipe 14.

  Therefore, convection does not occur in the path, and the water temperature rise at the bottom of the hot water tank 1 due to the water at the top of the hot water tank 1 flowing into the bottom of the hot water tank 1 is prevented, and the boiling performance of the heat pump unit 5 is reduced. do not do.

  Further, when draining the hot water tank, the water pressure from the forward direction exceeds the water pressure from the reverse direction inside the valve body 18 due to the drainage. Therefore, the check valve 15 is opened and the water in the reheating circuit 12 is drained without additional operation.

  As described above, the hot water supply apparatus according to the present invention can be applied to various heat pump water heaters having a reheating function.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 3 Drain pipe 4 Drain plug 5 Heat pump unit (heating means)
6 Three-way valve 7 Bath 8 Heat exchanger 9 Bath water circulation pipe 10 Bath water transfer pump 11 Hot water tank water transfer pump 12 Reheating circuit 12a Hot water tank heat exchanger connection pipe 12b Heat exchanger pump pipe 12c Pump hot water tank pipe 13 Boiling Pump 14 Water drain pipe (water drain flow path)
14a Reheating check valve piping 14b Check valve boiling pump piping 14c Pump drain piping 15 Check valve (back flow prevention means)
16 Relief valve 17 Hot water supply piping 18 Valve element 19 Valve rod 20 Spring 21 Rubber packing 22 Reheating circuit drain pipe 23 Reheating circuit drain plug

Claims (2)

A heating means, a hot water storage tank for storing hot water heated by the heating means,
A heat exchanger for heating the water in the bathtub with hot water in the hot water tank,
A reheating circuit in which hot water in the hot water tank circulates through the heat exchanger;
A drain pipe for draining the water in the hot water tank;
A drain plug connected to the drain pipe;
A relief valve disposed at the top of the hot water tank;
A drain passage for draining the water in the reheating circuit to the drain pipe;
With
The drainage flow path is provided using a part of the flow path in which water at the bottom of the hot water tank is conveyed to the heating means via the drain pipe,
By simply opening the drain plug and the relief valve, the water in the reheating circuit flows from the drain channel to the drain pipe, and the water in the hot water tank and the water in the reheating circuit are flown. It is set as the structure which can be drained from the said drain pipe. The hot water supply apparatus according to claim 1, wherein the drainage flow path includes a backflow prevention means for preventing a flow of water from the drain pipe side to the reheating circuit side.

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