JPH02230038A - Air conditioner - Google Patents

Abstract

PURPOSE:To prevent the abnormal increase of a water pressure on the inlet side during the starting of operation by a method wherein a heat valve system is mounted to the inlet pipe of a heat exchanger to which hot water is fed, a hot water line bypassing the heat valve system and the heat exchanger is provided, and most of hot water is caused to flow to the hot water line during the starting of the motion of the heat valve system. CONSTITUTION:During heating operation (the stop of an indoor unit 2b) of only, for example, an indoor unit 2a, only a heat valve system 24a is energized, and hot water heated by a heat exchanger 21 for heating is fed in an indoor heat exchanger 3a. In this case, since the heat valve system 24a is not brought into a full opening state from the starting of operation, water pass resistance of the heat valve system 24a is higher than that of a hot water line 25. Thus, hot water not sufficiently heated during the starting of operation bypasses an indoor heat exchanger 3a, is guided to a pressure tank 19 through the hot water line 25, and is heated again. This constitution prevents the abnormal increase of a water pressure in the vicinity of the valve system 24a during the starting of operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an air conditioner in which a thermal valve is provided in the hot water inlet pipe of a heat exchanger. (Example) Conventional technology The inlet pipe of the heat exchanger to which hot water is supplied is
As shown in Publication No. 6165, a thermal valve whose opening degree is gradually controlled is installed to prevent heat loss due to natural heat radiation when the fan is stopped, and also to prevent heat loss due to natural heat radiation when the fan is stopped. phenomenon).

(C) Problems to be Solved by the Invention When a thermal valve is installed in the inlet pipe of a heat exchanger in this way, immediately after the start of operation, the thermal valve is not completely opened, so the inside of the inlet pipe of the thermal valve is The pressure and temperature of hot water could become abnormally high.

The present invention aims to solve the above-mentioned problems. (2) Means for Solving the Problems In order to achieve this object, the present invention provides a hot water inlet pipe of a heat exchanger with a thermal valve, and a hot water pipe that bypasses the thermal valve and the heat exchanger. The pipe is equipped with a means to restrict the flow rate of hot water. (*) If the thermal valve is not completely opened immediately after starting operation,
The hot water heated by the heat source device is returned to this heat source device via the hot water pipe, and the temperature of this hot water is increased. After the thermal valve is fully opened, the hot water is sent to the heat exchanger and the hot water pipe is heated. Almost no hot water will flow into the streets.

1 is an outdoor unit, and 2a and 2b are indoor units.

These indoor units 2a, 2b include an indoor heat exchanger 3a,
3b is built in. The indoor heat exchangers 3a, 3b incorporate heating pipes 4a, 4b through which hot water flows during heating, and cooling pipes 5a, 5b through which refrigerant flows during cooling. The indoor heat exchangers 3a and 3b act as radiators during heating and as evaporators during cooling. These cooling pipes 5a and 5b are connected to each other through cooling pipes 6a and 6b.
Service valves 7a, 8a, 7b, 8 of M outside unit 1
In b, heating pipes 4a and 4b are connected to connectors 10a and 10b of outdoor unit 1 via heating pipes 9a and 9b, respectively.

In this outdoor unit 1, 11 is a compressor, 12 is an outdoor heat exchanger, 13 is a common cabillary tube, and 14 is a liquid injection tube, one end of which is connected to the compressor 11.
Capilano tube 13 and outdoor heat exchanger 1 whose other ends are common
It is connected between 2. 15a and 15b are branch pipes which are completely branched from the outlet side piping of the common capillary tube 13. These branch pipes 15a, 15b are provided with service valves (two-way valves) 7a, 7b, respectively. 16
Reference numerals a and 16b indicate on-off valves, which are connected to the inflow sides of the service valves 7a and 7b. These on-off valves 16a, 16b are both opened when energized and closed when not energized.

17a and 17b are dedicated capillary tubes connected to the inflow sides of the on-off valves 16a and 16b. 18 is an accumulator connected to the suction side piping of the compressor 11, and the suction side piping of this accumulator 18 is branched and provided with service valves (three-way valves) 8a and 8b.

19 is a pressure tank, 20 is a circulation pump, 21 is a heating heat exchanger, and a heater 22 is provided at the bottom thereof. The outlet side pipe of the heating heat exchanger 21 is branched into two, and a thermal valve 24 is installed in each branch pipe 23a, 23b.
a, 24b are provided. and each connector 10
a, 10b and the outlet side piping of the thermal valves 24a, 24b and the inlet side piping of the breath tank 19 are connected. 25 is a hot water pipe, one end of which is heated, valves 24a, 24
The other end of the inflow pipe 26 of b is connected to a pipe (indoor heat exchanger 3a,
3b is connected to the outlet pipe 27). This bypass pipe 25 is provided with means 28 for reducing the pipe diameter and restricting the flow rate of hot water. The aforementioned thermal valve 24a. Reference numeral 24b has a heater built into the valve, and when this heater is energized, the medium inside the valve is heated and expanded, thereby controlling the opening degree of the valve. Here, the opening degree of the valve gradually increases after energizing the heater starts, and becomes fully open after about 1 minute and 30 seconds.

In the air conditioner having such a configuration, the air purging of the cooling pipes 5a, 5b and the cooling pipes 6a, 6b of the indoor units 2a, 2b is performed as follows.

First, each indoor unit 2a. Air conditioning piping 6a from 2b,
6b to each service valve 7a, 7 of the outdoor unit 1.
Connect to b, 8a, 8b. In this case, service valve 8
The connections 26 between a and 8b and the cooling pipes 6a and 8b are slightly loosened. On the other hand, a power line is connected to the power terminal board (not shown) of the outdoor unit 1, and electricity is supplied to the outdoor unit 1, and this electricity is passed through the operation line to the two on-off valves f6a and 16b. two on-off valves 16a,
16b are forcibly opened. Then, when the service valves 7a and 7b are opened, the refrigerant in the outdoor unit 1 is transferred to the indoor heat exchanger 3a via the cooling pipes 6a and 6b.
．． 3b, then service valves 8a, 8b.
is discharged from the loosened connection 26. After the air purge is completed, remove the aforementioned operating wire and close the two on-off valves 16a, 16.
Close b. Normally, these two on-off valves 16a, 1
The opening/closing operation of 6b is controlled by another operating line. That is, when operating the indoor unit 2a (indoor unit 2b), the on-off valve 7a (on-off valve 7b) is energized and opened, and when both units t-2a and 2b are operated at the same time, both on-off valves 7a and 7b are opened. The valve will be opened by passing through the pipe. Then, the refrigerant discharged from the compressor 11 is caused to flow as indicated by the solid line arrow.

Next, for example, when heating only the indoor unit 2a (indoor unit 2b is stopped), only the thermal valve 24a is operated, and the hot water heated by the heating heat exchanger 21 is transferred to the indoor heat exchanger 3a. Send it in.

Since the thermal valve 24a is not fully opened until 1 minute and 30 seconds after the start of operation, the water flow resistance of the thermal valve 24a is greater than the water flow resistance of the hot water pipe 25. Therefore, hot water that is not sufficiently heated at the start of operation is transferred to the indoor heat exchanger 3a.
The water is bypassed and guided to the pressure tank 19 via the hot water pipe 25, where it is heated again (see the broken line arrow).

This prevents the water pressure near the inlet of the thermal valve 24a from becoming abnormally high at the start of operation. In addition, since hot water that has not been sufficiently heated does not flow to the indoor heat exchanger 3a, cold air is forced into the indoor unit 2a when water starts flowing to the indoor heat exchanger 3a.
This prevents it from being ejected.

Then, after 1 minute and 30 seconds have passed from the start of operation, the thermal valve 24a is fully opened, and the water flow resistance of the thermal valve 24a is reduced to the hot water pipe 2.
Approximately 70% of the hot water heated by the heating heat exchanger 21 is transferred to the indoor heat exchanger 3a, and the remaining 3
The remaining water flows into the hot water pipe 25 (see the dashed-dotted line arrow).

Further, when heating the indoor units 2a, 2b at the same time, both the thermal valves 24a, 24b are energized to flow hot water to both the indoor heat exchangers 3a, 3b at the same time. Here, at the start of this operation, like when the heating operation of one indoor unit 3a is started, it is difficult for hot water to flow to the indoor heat exchangers 3a, 3b, and cold air is prevented from being discharged from the indoor units 2a, 2b. Then, after 1 minute and 30 seconds have passed from the start of operation, about 90% or more of the heated hot water flows to the respective indoor heat exchangers 3a, 3b, and about 10% or less flows to the hot water pipe 25. (g) Effects of the invention As described above, the present invention provides a thermal valve in the inlet pipe of a heat exchanger to which hot water is supplied, and a hot water pipe that bypasses the thermal valve and the heat exchanger. , most of the hot water flows into the hot water pipe when the thermal valve starts operating. Therefore, it is possible to prevent an abnormal increase in water pressure on the inlet side of the thermal valve at the start of operation.

In addition, since hot water was not allowed to flow into the indoor heat exchanger for a certain period of time after the thermal valve started operating, cold air was discharged from the indoor unit when water started flowing. It is possible to make it less likely to occur.

[Brief explanation of the drawing]

The drawing is a refrigerant circuit diagram of the air conditioner of the present invention. 3a, 3b - heat exchanger, 24a, 24b = thermal valve,
25...Hot water pipe, 28...Means for restricting the flow rate.

Claims (1)

[Claims] 1) In an air conditioner in which a thermal valve is provided in the hot water inlet pipe of the heat exchanger, a hot water pipe is provided that bypasses the thermal valve and the heat exchanger, and a means for restricting the flow rate of hot water is provided in this pipe. An air conditioner characterized by the following features: