JPH09170787A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner in which a frosting and a freezing at an inlet port of an outdoor heat exchanger are prevented even if non- azeotropic refrigerant is applied and linen a heat exchanging performance can be attained without reducing a heating performance. SOLUTION: An air conditioner is constructed such that non-azeotropic refrigerant acting as refrigerant is applied in a freezing cycle mainly composed of a compressor 8, a four-way valve 10, an outdoor heat exchanger 6, a metering means 11 and an indoor heat exchanger 12. A freezing prevention pipe 13 for flowing discharged refrigerant gas of high temperature flowed from the compressor 8 is installed at an upstream side of the inlet port of the connecting pipe 14 connecting the outdoor heat exchanger 6 to the metering means 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a non-azeotropic mixed refrigerant as an alternative refrigerant, and more particularly to a structure for preventing freezing and frost formation of an outdoor heat exchanger during heating operation.

[0002]

2. Description of the Related Art In an outdoor unit of an air conditioner, the inside of the main body of the outdoor unit is provided with a partition plate 3 as shown in FIG.
And a machine room 5. The heat exchanger room 4 is provided with an outdoor heat exchanger 6 and a blower fan 7 for discharging the air heat-exchanged by the outdoor heat exchanger 6 to the outside. The machine room 5 is provided with a compressor 8, a four-way valve and throttle means (not shown), and an operation control device 9 such as the compressor 8, the four-way valve, and the blower fan 7. The blower fan 7 can rotate in a fixed direction regardless of whether it is in the cooling operation or the heating operation.

The compressor 8, the four-way valve 10 shown in FIG.
R22 is enclosed as a refrigerant in the refrigeration cycle composed of the outdoor heat exchanger 6, the expansion means 11, the indoor heat exchanger 12 provided on the indoor unit side, and the arrow indicates the refrigerant flow during heating. is there. As shown in FIG. 8A, the refrigerant R22 has almost no temperature gradient with respect to the pressure. Therefore, the refrigerant flows flowing through the outdoor heat exchanger 6 in the opposite directions during the cooling operation and the heating operation. In the heating operation, the desired heat exchange performance is obtained even when the air flow that is opposed to the refrigerant flow in the operation is parallel to the refrigerant flow in the heating operation, and ideal heat exchange is performed.

However, the non-azeotropic mixed refrigerant, which is regarded as a promising alternative refrigerant for R22, is shown in FIG.
As shown in Fig. 2, there is a temperature gradient with respect to the pressure, so in an air conditioner in which the refrigerant flow in the outdoor heat exchanger is opposite during cooling operation and heating operation, non-azeotropic mixed refrigerant is used for heating operation. In that case, the temperature of the inlet of the outdoor heat exchanger becomes the lowest in the refrigeration cycle, and there is a problem that heating performance may be deteriorated because only that portion is frosted and frozen.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and prevents frosting and freezing at the inlet of the outdoor heat exchanger even when a non-azeotropic mixed refrigerant is used. The purpose of the present invention is to provide an air conditioner that can obtain heat exchange performance without lowering heating performance.

[0006]

The present invention has been made to solve the above problems, and comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttle means and an indoor heat exchanger. In an air conditioner that uses a non-azeotropic mixed refrigerant as a refrigerant in a refrigeration cycle, on the windward side of the inlet portion of the outdoor heat exchanger that serves as an evaporator during heating operation, a high-temperature discharged refrigerant gas from the compressor An anti-freezing tube for circulating the above shall be provided.

As the non-azeotropic mixed refrigerant, R4
07C is used.

Further, the antifreezing pipe is arranged around the base end of the refrigerant pipe on the outdoor heat exchanger side, which covers one end of a connecting pipe connecting the outdoor heat exchanger and the throttle means. To do.

[0009] Then, a fixing tool having a fitting groove corresponding to the refrigerant tube at the center and holding portions corresponding to the anti-freezing tube formed at both ends is provided, and the anti-freezing operation is performed on the refrigerant tube through the fixing tool. Make sure that the tube is attached.

Alternatively, a fixing tool having a holding portion corresponding to the refrigerant tube in the center and fitting grooves corresponding to the antifreezing tube formed at both ends is provided, and the antifreezing is provided to the refrigerant tube via the fixing tool. Make sure that the tube is attached.

Alternatively, a fixture having a plurality of fitting grooves corresponding to hairpins of the outdoor heat exchanger at one end and a holding portion corresponding to the antifreezing tube at the other end is provided, and the fixture is provided through the fixture. The antifreezing tube is attached to the hairpin. Furthermore, a notch is formed between the plurality of fitting grooves.

[0012]

According to the above structure, the antifreezing pipe for allowing the high-temperature discharge refrigerant gas from the compressor to flow is disposed on the windward side of the inlet portion of the outdoor heat exchanger that serves as an evaporator during heating operation. Accordingly, it is possible to prevent frosting and freezing at the inlet of the outdoor heat exchanger, and prevent the heating performance from deteriorating.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same reference numerals are used for the same parts as in the conventional example. FIG. 1 shows an example of a refrigeration cycle according to the present invention, which uses a non-azeotropic mixed refrigerant as a refrigerant, and a compressor 8;
The four-way valve 10, the outdoor heat exchanger 6, the throttling means 11, and the indoor heat exchanger 12 are mainly configured.

Here, the outdoor heat exchanger 6 and the throttle means 1
On the windward side of the inlet portion of the connection pipe 14 that connects 1 and 1, a freeze prevention pipe 13 that allows the high-temperature discharge refrigerant gas from the compressor to flow is disposed. In addition, in FIG. 1, the arrow indicates the refrigerant flow during heating.

In this embodiment, R407C is used as the non-azeotropic mixed refrigerant. However, the present invention is not limited to R407C.

FIG. 2 shows a schematic structure of an outdoor unit of an air conditioner, in which 1 is a base, 2 is a box body, 3 is a main body consisting of a base 1 and a box body 2, and a heat exchange chamber 4 and a machine. It is a partition plate that is partitioned into the chamber 5. An outdoor heat exchanger 6 and a blower fan 7 are arranged in the heat exchanger chamber 4, and the machine chamber 5 switches not only the compressor 8 but also the refrigerant flow of the refrigeration cycle corresponding to the switching of cooling / heating operation. A four-way valve, a throttle means (capillary tube), an operation control device 9 such as a compressor 8, a four-way valve, a blower fan 7 and the like are arranged, and a non-azeotropic mixed refrigerant is enclosed in the refrigeration cycle.

The blower fan 7 is, as shown in FIG.
It is arranged inside the outdoor heat exchanger 6 formed in an L-shape, and the air flow passing through the outdoor heat exchanger 6 is connected to the outdoor heat exchanger 6 as shown by the arrow during both the cooling / heating operation. It is designed to rotate in a certain direction so that it passes through.

Here, as shown in FIGS. 2 and 3, the refrigerant on the outdoor heat exchanger side that covers the one end of the connection pipe 14 that connects the antifreezing pipe 13 to the outdoor heat exchanger and the throttle means. It is arranged around the base end of the pipe 14a.

Further, a fixture 15 having a fitting groove 15a corresponding to the refrigerant pipe 14a at the center and holding portions 15b corresponding to the antifreezing pipe 13 formed at both ends is provided. The antifreezing pipe is attached to the refrigerant pipe via the fixture.

Alternatively, as shown in FIG. 4, a fixture 15 having a holding portion 15b corresponding to the refrigerant pipe 14a at the center and fitting grooves 15a corresponding to the antifreezing pipe 13 formed at both ends is provided. The antifreezing tube may be attached to the refrigerant tube via the fixture.

Alternatively, as shown in FIG. 5, one end has a plurality of fitting grooves 15a corresponding to the hairpins 6a of the outdoor heat exchanger 6, and the other end has a holding portion 15 corresponding to the antifreezing pipe.
A fixture 15 having b and b is provided. The antifreezing tube may be attached to the hairpin via the fixing tool. Further, the notch 15c is formed between the plurality of fitting grooves.

With such a structure, the non-azeotropic mixed refrigerant shown in FIG. 8 (b), for example, the frosting and freezing of the inlet of the outdoor heat exchanger during the heating operation caused by the characteristics of R407C can be prevented. Therefore, the heat exchange rate of the outdoor heat exchanger 6 can be prevented from lowering.

[0023]

According to the air conditioner as described above, the high-temperature discharge refrigerant gas from the compressor is provided on the windward side of the inlet portion of the outdoor heat exchanger that serves as an evaporator during heating operation. An anti-freezing tube that can be distributed can be installed,
Even when a non-azeotropic mixed refrigerant is used, it is possible to provide an air conditioner which can prevent frosting and freezing at the inlet of the outdoor heat exchanger and can obtain heat exchange performance without lowering heating performance.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram showing one embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a first embodiment of an outdoor unit for an air conditioner according to the present invention.

FIG. 3 is a perspective view of a main part of the outdoor unit of the air conditioner showing the first embodiment of the present invention.

FIG. 4 is a perspective view of a main part of an outdoor unit of an air conditioner showing a second embodiment of the present invention.

FIG. 5 is a perspective view of a main part of an outdoor unit of an air conditioner showing a third embodiment of the present invention.

FIG. 6 is a refrigeration cycle diagram of an air conditioner showing a conventional example.

FIG. 7 is a schematic cross-sectional view of an outdoor unit of an air conditioner showing a conventional example.

FIG. 8 shows a pressure-enthalpy diagram of Freon R22 in (A) and a non-azeotropic mixed refrigerant R407C in (B).

[Explanation of symbols]

 1 Base 2 Box 3 Partition Plate 4 Heat Exchanger Room 5 Machine Room 6 Outdoor Heat Exchanger 6a Hairpin 7 Blower Fan 8 Compressor 9 Operation Control Device 10 Four-way Valve 11 Throttle Means (Capillary Tube) 12 Indoor Heat Exchanger 13 Antifreeze Tube 14 Connection Pipe Connecting Outdoor Heat Exchanger and Throttling Means 14a Refrigerant Pipe of Outdoor Heat Exchanger 15 Fixture 15a Fitting Groove 15b Holding Part 15c Cut

Claims (7)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger,
In an air conditioner using a non-azeotropic mixed refrigerant as a refrigerant in a refrigeration cycle consisting of a throttle means and an indoor heat exchanger, on the windward side of the inlet part of the outdoor heat exchanger that serves as an evaporator during heating operation, An air conditioner provided with an antifreezing pipe for allowing a high-temperature discharge refrigerant gas from the compressor to flow therethrough. 2. The non-azeotropic mixed refrigerant R407C
The air conditioner according to claim 1, wherein the air conditioner comprises: 3. The antifreezing pipe is provided around a base end of a refrigerant pipe on the outdoor heat exchanger side, which covers one end of a connecting pipe connecting the outdoor heat exchanger and the throttle means. The air conditioner according to claim 1, which is characterized in that. 4. A fitting groove for fitting the refrigerant pipe is provided at the center,
The air conditioner according to claim 3, characterized in that a fixture having a holding portion corresponding to the antifreeze pipe is provided at both ends, and the antifreeze pipe is attached to the connecting portion via the fixture. . 5. A holding portion corresponding to the refrigerant pipe is provided at the center,
The air conditioner according to claim 3, wherein fixing tools having fitting grooves corresponding to the antifreezing tube are formed at both ends, and the antifreezing tube is attached to the connecting portion via the fixing tools. Machine. 6. A fixture having a plurality of fitting grooves corresponding to hairpins of the outdoor heat exchanger at one end and a holding portion corresponding to the antifreezing tube at the other end is provided, and the fixture is provided via the fixture. The air conditioner according to claim 3, wherein the antifreezing pipe is attached to the hairpin. 7. The air conditioner according to claim 6, wherein a notch is formed between the plurality of fitting grooves.