JP2005061739A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of early exhibiting capacity, by quickly and surely escaping from a refrigerant flooding state at starting. <P>SOLUTION: In first-time starting of a compressor (unillustrated) after starting operation of the air conditioner, the compressor is operated in a low frequency for a prescribed time (for example, for 3 min), and is operated in a low frequency for a time (1 min) shorter than the prescribed time at ordinary starting on and after that time, and is allowed to escape from the flooding state in the first-time starting, and is made to early reach a prescribed frequency. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air conditioner, and particularly relates to protection of a compressor of a heat pump type air conditioner.

In the conventional air conditioner, in order to prevent the stagnation of the compressor, as shown in FIG. 4, at the time of the initial startup of the compressor and the normal startup after the thermo-off in the normal operation, at a low frequency for a predetermined time. The oil lubrication performance of the compressor was ensured by driving (see, for example, Patent Document 1).
JP 60-228782 A

  In the above conventional configuration, the compressor is operated at a low frequency for a predetermined time, so that the compressor can be protected at the time of sleep that tends to occur at the first start, but the same applies at the second and subsequent normal start that does not enter the sleep state. In addition, since it operates at a low frequency for a predetermined time, there is a problem that it takes time until the regular ability is exhibited.

  The present invention solves such a conventional problem. When the compressor is started for the first time, that is, when the stagnation is activated, the compression oil is prevented from popping out. An object of the present invention is to provide an air conditioner capable of quickly starting up an operation frequency and supplying sufficient capacity quickly.

  In order to solve the above-described conventional problems, the present invention operates the compressor at a low frequency for a predetermined time at the first start of the compressor after the start of the operation of the air conditioner, and operates the compressor at a low frequency at the subsequent normal start. In addition, the refrigerant is operated for a time shorter than the predetermined time. By operating for a predetermined time at a low frequency when the compressor is started for the first time, the refrigerant dissolved in the oil of the compressor is gradually released. The abrupt foaming phenomenon is suppressed, the oil in the compressor remains inside without being discharged, the lubrication performance is maintained, and at the normal start after the second time when the stagnation state is eliminated, at low frequency The necessary capacity can be supplied quickly by shortening the operation time of and allowing the predetermined frequency to be reached quickly.

  The air conditioner of the present invention suppresses the oil jumping out at the start of the compressor stagnation at the start of operation, and at the time of normal starting of the compressor after the second time, the operating frequency of the compressor is increased at an early stage. The ability can be supplied quickly.

A first aspect of the present invention is an air conditioner in which a variable frequency compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are connected in an annular shape, after the start of the operation of the air conditioner The compressor is operated for a predetermined time at a low frequency when the compressor is started for the first time, and the compressor is operated at a low frequency for a time shorter than the predetermined time at the subsequent normal startup. By operating at a low frequency for a predetermined time at the first start-up, the refrigerant dissolved in the compressor oil is gradually released, so that the sudden foaming phenomenon of the oil is suppressed and the oil in the compressor is not discharged. Necessary by shortening the operation time at low frequency and allowing it to reach the specified frequency early at the time of normal startup after the second time when it remains in the interior and maintains lubrication performance and the sleeping state is eliminated It can be supplied quickly the force.

  According to a second aspect of the present invention, when the operation of the compressor is stopped within a predetermined time when the compressor is first started, the next start of the compressor is regarded as the first time, and the compressor is operated at a low frequency for a predetermined time. Even if the compressor's initial low frequency operation time is short and the compressor's stagnation state has not been sufficiently relaxed, it should be operated again at the low frequency for a predetermined time at the second start-up. Thus, the sleeping state can be completely escaped, and at the time of normal startup thereafter, it is possible to quickly shift to a predetermined frequency, and the reliability of the compressor can be improved.

  Hereinafter, a first embodiment 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)
The first embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, the air conditioner of the present embodiment includes a variable frequency compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a decompression device 4, and an indoor heat exchanger 5 in an annular shape. Connected to form a heat pump refrigeration cycle.

  FIG. 2 is a diagram showing the relationship between the starting frequency of the compressor 1 and the operating time. After the first starting after the start of operation, that is, at the first starting, after operating for 3 minutes at a low frequency of 30 Hertz, Since the refrigerant dissolved in the oil of the compressor 1 during the operation at a low frequency is gradually released, the sudden foaming phenomenon of the oil is suppressed. For this reason, the oil in the compressor 1 remains inside without being discharged into the refrigeration cycle, and the lubricating performance can be maintained.

  And after the operation time has passed, the room temperature has reached the set temperature, and after the thermo-off (operation of the compressor 1 is stopped), the problem of sleeping is solved at the second and subsequent normal start-ups. Set the operating time at low frequency as short as 1 minute. Thereby, it is possible to quickly shift to a predetermined frequency corresponding to the required load from the room.

(Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In addition, about the same part as the said 1st Embodiment, the description is abbreviate | omitted using the same code | symbol and a name.

  FIG. 3 shows the relationship between the starting frequency of the compressor 1 of the air conditioner according to the present embodiment and the operating time. When the compressor 1 is started for the first time after starting operation, the operation is started at a low frequency of 30 Hz. If the operation of the compressor 1 stops within 3 minutes due to thermo-off, etc., the second (next) start is regarded as the first start, and the operation at a low frequency of 30 Hertz is performed again for 3 minutes. carry out. At the subsequent normal startup, the operating time at a low frequency of 30 hertz is 1 minute as in the first embodiment.

  As described above, according to the present embodiment, even when the operation time at the first low frequency is short and the stagnation state of the compressor is not sufficiently relaxed, the low frequency operation at the second start-up is performed. The sleep state can be surely escaped, and at each subsequent start-up, a short low-frequency operation can be performed, and then a transition to a predetermined frequency can be made early, so that the ability can be started up early.

As described above, the air conditioner according to the present invention can surely escape from the stagnation state when the compressor is started for the first time at the start of operation, and can start up to a predetermined capacity at an early stage during normal startup thereafter. So it is very useful in the air conditioner field.

Refrigeration cycle diagram of the air conditioner showing the first embodiment of the present invention Compressor frequency and operating time chart showing the operating condition of the air conditioner compressor Chart of compressor frequency and operating time showing operating state of compressor of air conditioner showing second embodiment of the present invention Compressor frequency and time chart showing the operating state of a conventional air conditioner compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 5 Indoor heat exchanger

Claims (2)

  In an air conditioner in which a frequency variable compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are connected in an annular shape, the first time after the start of the operation of the air conditioner An air conditioner characterized in that the compressor is operated at a low frequency for a predetermined time at startup, and the compressor is operated at a low frequency for a time shorter than the predetermined time at subsequent normal startup. When the operation of the compressor is stopped within a predetermined time when the compressor is started for the first time, the next start time of the compressor is regarded as the first time, and the compressor is operated at a low frequency for a predetermined time. The air conditioner according to claim 1.

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