JPS58120087A - Hot-water supplying machine - Google Patents

Abstract

PURPOSE:To prevent refrigerant medium or oil for a refrigerating machine from being mixed into supplying hot-water by a method wherein an inside tube is provided with leakage detecting grooves while the reduction of a pressure in the groove due to the leakage of the refrigerant medium is detected by a pressure detector, in the heat exchanger of water for supplying the hot-water produced by a refrigerating cycle. CONSTITUTION:The high-temperature high-pressure refrigerant medium from a compressor 1 exchanges the heat thereof with the water for supplying hot-water in the heat exchanger 2 of the water for supplying hot-water and the temperature thereof is increased. Here, the inside tube 10-1 of the heat exchanger 2 is the tube 10 provided with the leakage detecting grooves 10-5, therefore, the supplying hot-water, kept at an atmospheric pressure in the pressure thereof, is flowed into the groove 10-5 and the pressures in the enclosed groove and a gap 23 are increased in accordance with the amount of the leakage in case the tube is eroded by electric errosion. By the pressure, the switch 20-3 of the pressure detector 20 is put OFF and the operation of the refrigerating machine is stopped. Accordingly, the mixing of the refrigerant medium or the oil for the refrigerating machine into the supplying hot-water due to generation of leakage may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater that detects a puncture of a heat exchanger for hot water supply due to a 1gE meal or an external factor Eζ, and prevents refrigerant and refrigeration machine oil from getting mixed into hot water supply water. It is.

Conventionally, many hot water heaters have been made of copper on the water flow path side of the water heat exchanger of the heat pump type chilling unit for air conditioning, and the heat exchanger tubes on the hot water side are susceptible to surface corrosion such as mechanical corrosion and electrolytic corrosion due to hot water supply, as well as external factors. (e.g. vibration, shock), etc., the heat exchanger for hot water supply may become punctured, and there is a hole where the refrigerant in the heat pump refrigerant circuit and refrigeration machine oil can get mixed into the hot water supply water, causing sanitary problems when used for hot water supply. was there.

For this reason, there have been methods of increasing the thickness of the heat transfer tubes of heat exchangers for hot water supply, but this merely delays the occurrence of punctures and is not a sufficient measure.

The present invention aims to eliminate the above-mentioned drawbacks, and one embodiment of the present invention will be described below with reference to the drawings.
Figure 1 is a refrigerant cycle diagram of a water heater according to the present invention.
υ is a compressor, (2) is a heat exchanger for hot water supply, and a leak detection grooved pipe described later is inserted inside. (3) is a throttling device, a heat exchanger (evaporator) on the non-use side, and a blower (j) that blows air to the heat exchanger (4) on the non-use side, each of which is connected to refrigerant piping and used in a well-known refrigeration cycle. It consists of

Figure 2 is a detailed view of the leakage detection grooved pipe m inserted into the heat exchanger for hot water supply (illustration).In Figure 2, (1
0-1) is an inner pipe in which a large number of grooves (10-2) with a U-shaped cross section are formed on the outer periphery, and a hot water supply flow path (10-8) is formed inside.
) is formed. (10-4) has an inner tube (10
-1) into which the outer tube (1G-4) and the inner tube (10-1) form a leak detection groove (10-6). First, the leakage detection grooved pipe GO is inserted into the outside of the hot water supply heat exchanger (2) and into the inside of the hot water supply heat exchanger (2).
A refrigerant flow path (10-6) is formed between (b).

Figure 8 shows the 1-
Silk 1, (2-1) and (!-2) are compressors (1)
and a refrigerant side outlet to the expansion device (3), which are provided in the outer pipe (b). In addition, both ends of the outer tube (B) are subjected to a squeezing force and are airtightly fixed on the leakage detection grooved tube 4, and the refrigerant flow path (10-6) is closed.
ing.

In addition, one end of the inner pipe (10-1) of the leak detection grooved pipe QO is connected to the hot water outlet pipe (goods), and the leak detection groove (10-2
) is closed by a closing member such as a solder, and the other end is open. At the other end, the hot water supply inlet pipe is connected to the inner pipe (1G-1) of the leak detection grooved pipe QC) by brazing or the like. (2) is hermetically fixed at one end to the outer pipe (B) and at the other end onto the hot water inlet pipe (2).
.

Furthermore, the cap communicates with the open end of the leak detection groove (10-2), and a detection chamber (A) is formed inside the cap.

(E) is a pressure detection device configured to operate a switch (20-8) via a conduit (20-1) and a bellows (20-2) communicating with the detection chamber; )
The pressure in the leak detection groove (10-1) can be detected through the leak detection groove (10-1).

Next, the operation will be explained. In FIG.

From the compressor (1), the gas refrigerant discharged from the discharge port exchanges heat with the pumping water in the hot water heat exchanger (2), raises the temperature of the hot water, and is condensed to form a liquid. Becomes a refrigerant.

The pressure is then reduced by the expansion device (3), evaporated by the non-use side heat exchanger (4), and returned to the compressor (1).

However, when the inner surface of the inner pipe (10-1) of the hot water supply heat exchanger (2) is eroded due to surface corrosion such as chiming and electrolytic corrosion caused by the hot water supply, the erosion occurs in the leakage detection groove (10-1). When reaching 2), the hot water flows into the leak detection groove (10-5) which is maintained at atmospheric pressure. However, since the inside of this groove and the inside of the cap 4 are sealed, the pressure rises according to the amount of hot water that comes out, and the pressure detection device 4 is activated to adjust the temperature (20-8). ) is opened.

(Normally, the pressure detection device (e) is 0.85kg/cm2G
The E is set so that it operates at a certain level. ) Therefore, the operation of compression & (1) can be stopped without refrigerant, refrigerating machine oil, etc. flowing into the hot water supply water. In addition, due to external factors G, the outer tube (10
-4) If a crack occurs and the refrigerant power supply leaks, the pressure in the groove will rise in the same way as above, and the pressure detection value -(2) will be activated.

In addition, in the above embodiment, the inside of the leakage detection groove (10-6) and the cap @ were set to atmospheric pressure, but even if the pressure cassette/soto value of the pressure detection device (■) is changed to a vacuum or above imaginary atmospheric pressure. A similar effect can be obtained. Also, connect the groove (10-2) to the outer tube (1
0-4) may be formed on the inner surface of the leak detection groove (ll), and it is not necessary to provide a detection chamber (inlet), and both ends of the groove (10-2) may be formed with closing members. It may be closed to detect the pressure inside it.

As described above, according to the present invention, a leak detection grooved pipe is adopted as the inner pipe of the heat exchanger for hot water supply, and when hot water supply water or refrigerant leak t'L occurs, the pressure in the leak detection groove is reduced. Since the pressure was detected by the pressure detection device, it was possible to stop the operation of the refrigeration cycle, and even in the event of a leak, it is possible to prevent the refrigerant and cold N machine oil from getting mixed into the hot water supply water. , can solve hygiene problems.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of the water heater according to the present invention. FIG. 2 is a detailed view of the leak detection grooved pipe, and FIG. 8 is a detailed view of the hot water supply heat exchanger. In addition. In the drawings, the same reference numerals indicate the same or corresponding parts. In the figure, (2) is a heat exchanger for hot water supply, (A) is a leak detection grooved tube, (1G-1) is an inner tube, (1G-5) is a leak detection groove, (1G-8) is an outer tube. , (a) is a pressure detection device. Agent Makoto Shimano

Claims (1)

[Claims] In a refrigerator that supplies hot water using a refrigeration cycle, grooves are formed on the inner surface of the outer tube or the outer surface of the inner tube,
The inner pipe is inserted into the outer pipe by inserting the leak detection grooved pipe into the outer pipe, and the inner pipe is inserted into the outer pipe, and the inner pipe is inserted into the outer pipe. A heat exchanger having a refrigerant flow path formed between the inner tube and the outer tube, and communicating with the leakage detection groove. A water heater characterized by being equipped with a pressure detection device that detects its internal pressure.