JPS6035013Y2 - water heater - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water heater including an electric circuit, and more particularly to an electric shock prevention mechanism in this type of water heater.

Generally, in a water heater that includes an electric circuit, when the water supply and hot water supply piping are constructed of a conductive material such as metal, measures are required to prevent electric shock due to electrical leakage.

In the conventional water heater, as shown by the dotted line in FIG.
Electrical insulating member 3 made of ceramic pipe or vinyl chloride pipe (when hot water of 90'C is flowing over a length of 90'C)
0.30 was installed to prevent electric shock.

However, since the insulation resistance of water is relatively low, a long electrically insulating member 30 is required in order to electrically insulate the water supply and hot water supply pipes 12 and 13 in the middle.
There was a problem that the on-site construction work became complicated and the material cost and construction cost also increased.

The present invention was devised in view of the above problems, and consists of a condenser connected to a heat source unit equipped with a compressor and a heat source side heat exchanger acting as an evaporator through two connecting refrigerant pipes. In a hot water supply system in which a user-side heat exchanger that acts as The object of this invention is to provide a safe and low-cost water heater, which is characterized by electrical insulation on the refrigerant side, which has a much higher insulation resistance.

Hereinafter, a water heater according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The hot water supply system of this embodiment uses a condenser of a refrigeration system as a heat source for heating water.

In FIG. 1, the reference numeral 1 indicates a hot water storage tank, and the reference numeral 2 indicates a heat source unit that is a part of a refrigeration system.

The heat source unit 2 is configured by disposing a compressor 4, an expansion valve 5, a heat source side heat exchanger 6 acting as an evaporator, and a fan 7 in a casing 3.

In the hot water storage tank 1, a user-side heat exchanger 8, which functions as a condenser and is part of a refrigeration system, is disposed as a heat source for heating water.

The heat source unit 2 and the user-side heat exchanger 8 are connected by two metal connecting refrigerant pipes 9 and 10 that are installed on-site.

That is, in this embodiment, the compressor 4, the connecting refrigerant pipe 9. A refrigeration cycle is constructed in which a user-side heat exchanger 8, a connecting refrigerant pipe 10, an expansion valve 5, and a heat source-side heat exchanger 6 are connected in sequence, and the refrigerant X (in this example, Freon 22 refrigerant is used) is indicated by the dotted arrow. Cycle as shown.

On the other hand, a water supply pipe 12 with an on-off valve 11 interposed therebetween is connected to the bottom of the hot water storage tank 1, and a hot water supply pipe 13 is connected to the top thereof.

A hot water supply cock 14.14 is provided at the end of the hot water supply pipe 13.

In the middle of the connecting refrigerant pipes 9 and 10, there is an electrically insulating member 16 made of glass or synthetic resin, etc., as described later.
．． 16 are interposed respectively.

In this embodiment, the electrically insulating member 16 is interposed as a part of the insulating joint unit 15 as shown in FIGS. 2 to 7.

This insulated joint unit 15 includes a pair of metal joint pipes 1.
7.17 and an electrically insulating member 16 made of glass or synthetic resin such as Teflon (registered trademark), which is interposed between the two joint tubes 17.17.

Various specific examples of the insulating joint unit 15 are shown in FIGS. 2 to 7, and will be explained in sequence below.

In the case of Fig. 2, the joint pipes 1 are placed opposite each other with a slight gap S.
7. An electrically insulating member 16 made of glass is fused or adhered to the outer periphery of the 17-piece and both joint tubes 17, 17.

Reference numeral 18 is a reinforcing member that protects the outer periphery of the electrically insulating member 16, and 19 is an outer covering that covers the outer periphery of the reinforcing member 18.

FIG. 3 shows the joint tubes 17.
17 are connected by an electrically insulating member 16 made of a glass tube.

Figure 4 shows a joint tube 17.17 with one side having a large diameter and the other side having a small diameter, and after inserting the small diameter side into the large diameter side, a glass electrical insulating member 16 is fused between the two. ing.

FIG. 5 shows a joint tube 17.17 having an integrally formed flange 17at17a having a funnel-shaped outer end surface on the opposite side, and a glass electrical insulator between the flange portions 17a, 17a facing each other with a slight gap S between them. After the member 16 is filled and fused, the flanges 17a, 17a are connected with bolts 20 and 20 made of Teflon resin.

Note that if the bonding force between the flanges 17a, 17a and the electrically insulating member 16 is strong, the bolts 20 and 20 may be omitted.

Reference numeral 21 is a nut.

FIG. 6 shows a joint tube 17.17 having flanges 17a, 17a having flat outer end surfaces on opposite sides, and flanges 17ag17.
A Teflon resin O-ring type electrical insulating member 16 is interposed between the two, and both are connected to each other by a Teflon resin bolt 20.2.
0 indicates a combination.

FIG. 7 shows a structure in which the electrical insulating member 16 in FIG. 6 is replaced with a donut-shaped member made of glass.

Next, the operation of the illustrated water heater will be explained.

This hot water supply device radiates heat absorbed by a heat source side heat exchanger 6, which acts as an evaporator, in a user side heat exchanger 8, which acts as a condenser, and supplies the heat into a hot water storage tank 1 via a water supply pipe 12. The hot water supply valve 14 and the hot water tap 14 and 14 serve to heat the water that is used and supply hot water from the hot water taps 14 and 14 via the hot water supply piping 13 .

At this time, there is a risk of electrical leakage from current-carrying parts such as the compressor 4, but according to this embodiment, an insulating joint unit 15 with an electrically insulating member 16 interposed between each of the connecting refrigerant pipes 9 and 10 is provided. Therefore, electrical leakage to the hot water tank 1 side can be prevented.

When the electrical insulating member 16 is interposed between the refrigerant pipes 9 and 10 as in the present invention, a refrigerant (for example, Freon 22 refrigerant) is used.
However, even after considering the mixing with refrigerating machine oil, water (90℃
Compared to conventional hot water, which has an insulation resistance of 2000Ω・0), it has a very high insulation property (the refrigerant Freon 22 mixed with about 15% oil has an insulation resistance of IOMΩ・0 or more). Compared to piping insulation, it is possible to significantly shorten the insulation distance (calculated to be approximately 1 in 500@).

Next, the effects of the water heater of the present invention will be described.

According to the present invention, the heat source unit 2, which is equipped with a compressor 4 and a heat source side heat exchanger 6 that acts as an evaporator, is connected to the heat source unit 2 by two connecting refrigerant pipes 9 and 10, and acts as a condenser. In a hot water supply system in which a side heat exchanger 8 is disposed in a hot water storage tank 1, electrically insulating members 16, 16 made of glass, synthetic resin, etc. are installed in the middle of the connecting refrigerant pipes 9, 10.
Since electrical insulation is provided between the refrigerant pipes 9 and 10 through which refrigerant having a much higher electrical insulation property than water flows, the electrical insulation member 16 can be very small. This has the practical effect of simplifying the on-site assembly work and providing a low-cost, safe water heater with an electric shock prevention function.

Furthermore, if the electrical insulating member 16 can be provided as a unit as the insulating joint unit 15 as in the illustrated embodiment, there is an advantage that costs can be reduced through mass production at a factory and on-site piping work can be simplified. be.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of a water heater according to an embodiment of the present invention;
2 to 7 are longitudinal sectional views showing various specific examples of the insulating joint unit in the water heater of FIG. 1. FIG. 1...Hot water storage tank, 2...Heat source unit,
4... Compressor, 6... Heat source side heat exchanger, 8... User side heat exchanger, 9, 10...
- Connecting refrigerant piping, 16... Electrical insulation member.

Claims (1)

[Scope of utility model registration request] Two refrigerant pipes 9 connect to the heat source unit 2 that includes a compressor 4 and a heat source side heat exchanger 6 that acts as an evaporator.
, 10, in which a user-side heat exchanger 8 serving as a condenser is disposed in a hot water storage tank 1, the connecting refrigerant pipes 9 and 10 are provided with a pipe made of glass, synthetic resin, etc. A hot water supply device characterized in that electrically insulating members 16 and 16 are respectively provided.