JP2008267675A - Hot water storage water heater - Google Patents

Abstract

An object of the present invention is to provide a hot water storage type hot water heater that improves workability and is highly usable.
A hot water storage type water heater of the present invention includes a heating means, a hot water storage tank for storing hot water heated by the heating means, a forward pipe connecting a lower portion of the hot water storage tank and the heating means (5). 7) and return pipes (6, 8) for connecting the upper part of the hot water storage tank 1 and the heating means 2, and the forward pipes (5, 7) are connected to the pipe 5 from the lower part of the hot water storage tank 1 and the heating means. The pipes 7 from 2 are connected to each other at the forward connection port 3, and the forward connection port 3 has a built-in water stop means, thereby eliminating construction problems and improving usability. .
[Selection] Figure 1

Description

  The present invention relates to a hot water storage type water heater, and particularly relates to a connection port provided in a pipe connecting a hot water storage tank and a heating means.

  Conventionally, this type of hot water storage type hot water heater has a hot water storage tank and a heating means connected by piping, and the piping from the hot water storage tank and the piping from the heating means are provided with a connection port on the return side and the back side, respectively. It is connected. And in the state where water is full in the hot water storage tank, when releasing the connection between the hot water storage tank and the heating means at the time of maintenance, the water stopping means for stopping the supply of water separately provided on the pipe is operated, The water flow state of the hot water storage tank and the heating means had to be canceled (for example, see Non-Patent Document 1).

FIG. 5 is a configuration diagram of a conventional hot water storage type water heater. In FIG. 5, a hot water storage tank 101 and a heating means (for example, a heat pump unit) 102 are provided, and the lower part of the hot water storage tank 101 and the heating means 102 are connected by an outgoing connection port 103. And the heating means 102 are connected by a return connection port 104. Further, a water stop means 107 is provided between the forward connection port 103 and the heating means 102.
Matsushita Electric Industrial Co., Ltd., Heat Pump Water Heater Construction Manual (Part No .: HE-37K3XWS), 2006, p8-9, Internet <URL: http://national.jp/sumai/hp/pdf/k_k3x.pdf>

  However, in the conventional configuration, the installation of the water stop means 107 is forgotten in the process of installation work, or a non-standard water stop means 107 (for example, a water stop means with a check valve) is attached. When a person's mistake stops boiling or removes the heating means, there is a problem that the water cannot be removed unless all the water in the hot water storage tank is drained.

  This invention solves the said conventional subject, and it aims at improving workability | operativity and providing the hot water storage type hot-water supply machine with high usability.

  In order to solve the above-described conventional problems, a hot water storage type water heater of the present invention connects a heating means, a hot water storage tank for storing hot water heated by the heating means, a lower portion of the hot water storage tank, and the heating means. A forward pipe and a return pipe connecting the upper part of the hot water storage tank and the heating means, and the forward pipe is connected to the pipe from the lower part of the hot water storage tank and the pipe from the heating means at the forward connection port. Since it is configured to be connected, and the water stop means is built in the forward connection port, it is possible to eliminate problems of construction and improve usability.

  INDUSTRIAL APPLICABILITY The present invention can improve the workability and provide a hot water storage type hot water heater having high usability.

A hot water storage type water heater according to a first aspect of the present invention includes a heating means, a hot water storage tank for storing hot water heated by the heating means, a forward pipe connecting the lower portion of the hot water storage tank and the heating means, and the hot water storage tank. A return pipe that connects the upper part and the heating means, and the forward pipe is configured such that the pipe from the lower part of the hot water storage tank and the pipe from the heating means are connected to each other at the forward connection port, Since the water stop means is built in the forward connection port, it is possible to eliminate construction problems and improve usability.

  A hot water storage type water heater according to a second aspect of the present invention includes a heating means, a hot water storage tank for storing hot water heated by the heating means, a forward pipe connecting the lower portion of the hot water storage tank and the heating means, and the hot water storage tank. A return pipe connecting the upper part and the heating means, and the return pipe is configured such that a pipe from the upper part of the hot water storage tank and a pipe from the heating means are connected to each other at a return connection port, Since the water return means is built in the return connection port, it is possible to eliminate problems in construction and improve usability.

  Since the hot water storage type water heater of the third invention is configured so that it cannot be operated with bare hands, especially in the first or second invention, since the water stop means has a screw-type valve configuration, the user mistakenly The risk of operation can be reduced.

  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 configuration diagram of a hot water storage type water heater in the present embodiment. In this embodiment, a heat pump using carbon dioxide as a refrigerant is used as the heating means of the hot water storage type hot water heater. In the present embodiment, the water at the bottom of the hot water storage tank 1 is connected to the heat pump unit 2 through the tank outgoing pipe 5, the outgoing connection port 3, and the heat pump outgoing pipe 7. In the heat pump unit 2, the water entered by the heat pump is warmed. The heated water passes through the heat pump return pipe 8, passes through the return connection port 4, passes through the tank return pipe 6, and is stored in the upper part of the hot water storage tank 1. By repeating this, the heat pump water heater stores hot water in the hot water storage tank 1. The forward connection port 3 has a built-in water stop means, and it is not necessary to provide a separate water stop means between the forward connection port 3 and the heat pump unit 2.

  In the present embodiment, out of the pipes connecting the hot water storage tank 1 and the heat pump unit 2, the outgoing pipes connecting the lower part of the hot water storage tank 1 and the heat pump unit 2 are the tank outgoing pipe 5, the outgoing connection port 3, and the heat pump outgoing pipe. 7, the return pipe connecting the upper part of the hot water storage tank 1 and the heat pump unit 2 is composed of a heat pump return pipe 8, a return connection port 4, and a tank return pipe 6.

  The heat pump unit 2 has a heat pump cycle in which a compressor, a water-refrigerant heat exchanger, a decompression device, and an evaporator are sequentially connected in an annular manner with refrigerant piping, and carbon dioxide is used as a refrigerant. In addition, the heat pump outlet pipe 7 and the water inlet side of the water refrigerant heat exchanger are connected via a water pump (not shown). By operating the water pump, water refrigerant heat exchange is performed from the lower part of the hot water storage tank 1. In the water-refrigerant heat exchanger, water and the refrigerant exchange heat to generate hot hot water. The water outlet side of the water refrigerant heat exchanger and the heat pump return pipe 8 are connected, and the high-temperature water generated by the water refrigerant heat exchanger is returned to the upper part of the hot water storage tank 1.

  Next, a method for removing the heat pump unit 2 from the system for maintenance or the like will be described.

  First, there are two methods for removing the heat pump unit 2 without throwing away the hot water stored in the hot water storage tank 1.

The first method is to attach water stop means to both the forward connection port 3 and the return connection port 4 connected to the heat pump forward pipe 7 and the heat pump return pipe 8, and if both are closed, the hot water in the hot water storage tank 1 remains stored. The heat pump unit 2 can be removed. However, the need for two water stop means not used except for maintenance is not preferable because it is uneconomical and the construction becomes complicated.

  The second method is a method in which a water stop means is built in the outgoing connection port 3 to make the inside of the hot water storage tank 1 have a negative pressure. In the present embodiment, a method of providing a water stop means only at the outgoing connection port 3 will be described.

  In the present embodiment, in order to keep hot water in the hot water storage tank 1 stored in one outgoing connection port 3 having a built-in water stop means, it is necessary to make the internal pressure of the hot water storage tank 1 negative. In the negative pressure forming method, first, the tip of the relief valve pipe 11 is closed by attaching a cap or a rubber hose with the tip closed. In this state, the drainage means 12 attached to the tip of the drainage pipe 12 from the bottom of the hot water storage tank 1 is opened and the water in the hot water storage tank 1 is drained. This is because the hot water storage tank 1 is in a negative pressure state because air does not enter it, and the drainage means 12 is closed in that state.

  Next, when the water stop means (screw-in type valve in the present invention) built in the forward connection port 3 is closed, the heat pump unit 2 can be removed. Next, the structure of the water stop means will be described with reference to FIGS. FIG. 2 shows an outgoing connection port 3 incorporating a water stop means. This forward connection port uses a screw-in type valve to reduce the height and improve workability. The cross-sectional view when the screw-in valve is opened is shown in FIG. 3, and the path through which water flows is opened by turning the screw counterclockwise with a flathead screwdriver or the like. Also, as shown in FIG. 4, the water path is closed by screwing the screw clockwise with a flat-blade screwdriver or the like.

  As described above, in the present embodiment, since the water stop means is built in the forward connection port 3 provided at the lower part of the hot water storage tank 1, the heat pump unit 2 cannot be removed during maintenance due to forgetting to attach the water stop means. In addition, there are no cases in which the pressure loss of the water stop means is large and a failure occurs in boiling. In addition, it is possible to provide a heat pump water heater with improved workability by incorporating a water stop means from the beginning. In addition, using a screw-in valve eliminates the risk of incorrect operation.

  As described above, in the configuration of the hot water storage type hot water heater according to the present invention, by adopting a configuration in which it is not necessary to separately install the water stopping means, the workability is improved, and the heating means is not limited to the heat pump. It can be used in all heating means that can realize the same configuration.

Configuration diagram of heat pump water heater in Embodiment 1 Configuration diagram of forward connection port in embodiment 1 Configuration diagram for normal connection in Embodiment 1 Configuration diagram of maintenance connection port in Embodiment 1 Configuration diagram of heat pump water heater in the conventional embodiment

Explanation of symbols

1 Hot water storage tank 2 Heat pump unit 3 Outward connection port (built-in water stop means)
4 Return connection port 5 Tank return pipe 6 Tank return pipe 7 Heat pump forward pipe 8 Heat pump return pipe 9 Relief valve connection pipe 10 Relief valve (with negative pressure valve)
DESCRIPTION OF SYMBOLS 11 Relief valve pipe 12 Drain pipe 13 Drain means 101 Hot water storage tank 102 Heat pump unit 103 Outward connection port 104 Return connection port 105 Tank pipe 106 Tank return pipe 107 Water stop means

Claims (3)

A heating means, a hot water storage tank for storing hot water heated by the heating means, a forward pipe connecting the lower part of the hot water storage tank and the heating means, and a return pipe connecting the upper part of the hot water storage tank and the heating means The forward pipe is configured such that the pipe from the lower part of the hot water storage tank and the pipe from the heating means are connected to each other at the forward connection port, and the water stop means is built in the forward connection port. A hot water storage type water heater characterized by A heating means, a hot water storage tank for storing hot water heated by the heating means, a forward pipe connecting the lower part of the hot water storage tank and the heating means, and a return pipe connecting the upper part of the hot water storage tank and the heating means The return pipe is configured such that a pipe from an upper part of the hot water storage tank and a pipe from the heating means are connected to each other at a return connection port, and the return connection port has a built-in water stop means. A hot water storage type water heater characterized by The hot water storage type hot water supply device according to claim 1 or 2, wherein the water stop means has a screw-type valve configuration.

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