JP2005090807A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator of low noise by preventing the air column resonance during a time when the temperature/pressure of a compressor internal space are suddenly changed from the stop of the compressor to the operation of the compressor at an operating frequency in initial starting. <P>SOLUTION: This refrigerator comprises a rotational frequency adjusting means 9 for operating an electric element 3 at a rotational frequency originally selected, after the electric element 3 is rotated at a rotational frequency lower than that originally selected for a specific time in starting the compressor, whereby the generation of the air column resonance can be prevented in a case when the air column resonance often occurs on a rotational frequency side higher than that originally selected, as the pressure in a sealed container is not sufficiently lowered in starting the compressor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an inverter refrigerator that reduces noise generated from a compressor in which the inside of a sealed container is a low pressure reciprocating type and the number of rotations is variable.

  In recent years, in order to save energy and to ensure cooling performance under high loads, refrigerators have become the mainstream inverter type in which the rotation speed of the compressor can be varied according to the load state of the refrigerator.

  In general, when a motor reaches a certain rotational speed, a resonance phenomenon occurs between the compressor body and noise and vibration. In particular, in an inverter refrigerator, the number of revolutions changes variously, so this resonance phenomenon is also likely to occur. In addition, the compressor is mainly of a reciprocating type with a low pressure inside the sealed container from the viewpoint of reliability. In this case, an air column resonance phenomenon occurs between the sealed container and the inner space of the sealed container, and an annoying noise is generated. There is a case. This air column resonance phenomenon occurs due to the balance between the rotational speed of the compressor, the shape of the sealed container, and the temperature / pressure conditions of the space inside the sealed container. Changes in temperature and pressure conditions in the space are likely to occur and the possibility of resonance is high.

For this reason, control has been provided that intentionally changes the rate of change when the rotational speed changes to prevent the occurrence of resonance. (For example, see Patent Document 1)
Hereinafter, the conventional refrigerator will be described with reference to the drawings.

FIG. 3 is a block diagram showing a configuration of a conventional refrigerator control device. As shown in FIG. 3, a conventional refrigerator control device includes a load detection unit 11 that detects the temperature of a refrigerator or a compressor and senses a load state of the refrigerator, and a load that is detected by the load detection unit 11. , The current operating frequency determining means 12 for determining the current operating frequency, the resonant frequency storing means 13 for storing the preset resonant frequency, and the operating frequency (f ₀ at the initial startup of the compressor) ), The current operating frequency (f _c1 ) and the initial operating frequency (f ₀ ) input from the current operating frequency determining unit 12 and the initial operating frequency setting unit 14, respectively. the resonant frequency inputted from the storage unit 13 the resonance frequency band between the resonance band determining unit 15 determines (hereinafter resonance band resonance (f _r1) and referred) is present, the In response to the determination made by the vibration band determination unit 15, the current operation frequency determination unit 12 current driving frequency determined from the (f _c) and the operation frequency control means 16 for varying and outputting an output from the operation frequency control means 16 Compressor driving means 17 for driving the compressor at the operated frequency.

  About the refrigerator comprised as mentioned above, the operation | movement is demonstrated according to the flowchart of the control apparatus of the conventional refrigerator of FIG. 4 below.

As shown in FIG. 4, at the initial startup of the refrigerator, the initial initial operating frequency setting means 14 sets the initial operating frequency (f ₀ ) of the compressor, and the resonant frequency storage means 13 has the resonance band (f _r1 ). Is set (S1), and the temperature (not shown) (load: T1) of the inside of the refrigerator or the compressor (load: T1) is sensed and output from the load detection means 11 (S2). Then, receiving the output (T1), the current frequency (f _c ) is determined according to the load state inside the refrigerator (S3), and the compressor operating frequency (f ₀ : 55 Hz, for example) at the initial startup and the current operation again. It is determined whether a resonance band (f _r1 ) exists between the frequencies (f _c : 49 Hz, for example) (S4). As a result of the determination, the resonance band (f _r1 ) is the operating frequency of the compressor at the initial start-up ( f ₀₎ and between the current frequency (f _c) When standing, variable speed setting means operating frequency control means 16 sharply by varying the speed increase rate (t) (not shown) (S5), deviates rapidly from the resonance band of the current operation frequency (f _c) After doing so (for example, 37 Hz), the compressor is driven by the compressor driving means 17, and as a result of the determination in the fourth stage (S4), the resonance band (f _r1 ) is the operating frequency of the compressor at the time of initial startup. If it does not exist between (f ₀ ) and the current frequency (f _c ), the compressor is driven to the current state (S6) and the resonance frequency avoidance control is terminated.
Japanese Patent No. 3291284

  However, the above conventional control cannot avoid the occurrence of air column resonance during the rapid change in temperature and pressure in the compressor internal space from when the compressor stops until the compressor operates at the operating frequency at the time of initial startup. was there.

  The present invention solves the conventional problems, and provides a refrigerator with low noise by preventing the occurrence of air column resonance from when the compressor is stopped until the compressor is operated at the operation frequency at the time of initial startup. Objective.

  In order to solve the above-mentioned problems, the present invention provides a compressor including a hermetic container, an electric element therein, and a compression element that is driven by the electric element and opens a gas inlet into the hermetic container; It comprises a control means for driving and controlling the electric element, and a rotation speed selection means for selecting the rotation speed of the electric element from a plurality of preset rotation speeds, and the predetermined time at the start of the compressor is the originally selected rotation speed Rotational speed adjusting means is provided for operating the electric element at a rotational speed originally selected after operating the electric element at a different rotational speed.

  As a result, the operating rotational speed of the compressor is adjusted at the time of starting the compressor in which the temperature and pressure change abruptly, and the occurrence of air column resonance accompanying the pressure change in the hermetic container of the compressor is avoided.

  According to the present invention, it is possible to avoid the occurrence of air column resonance due to the pressure change in the hermetic container of the compressor by adjusting the operating rotational speed of the compressor at the time of starting the compressor in which the temperature and pressure change rapidly. And a low-noise refrigerator can be provided.

  The invention according to claim 1 is a compressor constituted by a sealed container, an electric element inside thereof, a compression element driven by the electric element and having a gas inlet opening in the sealed container, and the electric element. It comprises a control means for driving control and a rotation speed selection means for selecting the rotation speed of the electric element from a plurality of rotation speeds set in advance, and the predetermined time at the start of the compressor is different from the rotation speed originally selected. Rotation of the compressor at the time of starting the compressor in which the temperature and pressure change suddenly by providing a rotation speed adjusting means for operating the electric element at a rotation speed originally selected By adjusting the number, it has the effect of avoiding the occurrence of air column resonance accompanying the pressure change in the closed container of the compressor.

  According to a second aspect of the present invention, in the first aspect of the invention, when the compressor is started, the electric element is operated for a predetermined time at a lower rotational speed than the originally selected rotational speed, and then at the originally selected rotational speed. It is designed to operate an electric element.If the pressure in the sealed container at the time of starting the compressor does not drop sufficiently, air column resonance is likely to occur at a higher rotational speed than the originally selected rotational speed. It has the effect of avoiding the occurrence of column resonance.

  According to a third aspect of the present invention, in the second aspect of the invention, when the rotation speed selected at the time of starting the compressor is the minimum rotation speed set by the rotation speed selection means, the rotation speed originally selected at the time of startup After the electric element is operated at a higher rotational speed for a predetermined time, the electric element is operated at the originally selected rotational speed, and the minimum rotational speed set by the compressor by the rotational speed selection means By rotating at a lower rotational speed, it has the effect of avoiding the occurrence of air column resonance while preventing a decrease in reliability due to the oil running out of the sliding portion of the compression element.

  According to a fourth aspect of the present invention, in the first aspect of the invention, at the time of starting the compressor, the electric element is operated for a predetermined time at a higher rotational speed than the originally selected rotational speed, and then at the originally selected rotational speed. It is designed to operate an electric element.If the pressure in the sealed container at the time of starting the compressor does not drop sufficiently, air column resonance is likely to occur at a lower speed than the originally selected speed. It has the effect of avoiding the occurrence of column resonance.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, when the rotation speed selected at the time of starting the compressor is the maximum rotation speed set by the rotation speed selection means, the rotation speed originally selected at the time of startup. After the electric element is operated at a lower rotation speed for a predetermined time, the electric element is operated at a rotation speed originally selected, and the minimum rotation speed set by the compressor by the rotation speed selection means It has the effect of avoiding the occurrence of air column resonance while preventing deterioration of mechanical reliability such as wear of the compression element due to rotation at a higher rotational speed.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the predetermined time at the time of starting the compressor is set to a plurality of rotation speeds different from the originally selected rotation speed. When the electric element is operated with the engine speed changed, and provided with a rotation speed adjusting means for operating the electric element at the originally selected rotation speed, the pressure in the sealed container at the time of starting the compressor is not sufficiently reduced. It is possible to cope with a change in the number of revolutions at which air column resonance occurs due to pressure fluctuations, and to prevent the occurrence of air column resonance.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to fifth aspects, the predetermined time at the time of starting the compressor is a rotational speed different from the originally selected rotational speed and steplessly. When the compressor is started by providing a rotation speed adjusting means for operating the electric element at the rotation speed originally selected after changing the rotation speed so as to approach the rotation speed originally selected. When the pressure in the airtight container is not sufficiently reduced, the rotation speed at which air column resonance occurs due to pressure fluctuation can be surely dealt with, and this has the effect of more reliably avoiding air column resonance.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the rotation speed adjusting means is limited to the start-up after power-on of the refrigerator. Air column resonance is likely to occur rapidly, and the time until the pressure in the sealed container stabilizes is relatively fast while reliably avoiding the occurrence of air column resonance only at the time of startup after power-on. It has an effect of avoiding the adverse effect of giving unpleasant feeling due to the change of the rotating sound generated by the change of the rotation speed at the normal start-up with less danger.

  According to a ninth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the rotation speed adjusting means is limited to the start-up after the completion of the defrosting, whereby the pressure change in the sealed container is determined. Air column resonance is likely to occur severely The time until the pressure in the sealed container stabilizes is relatively early, while avoiding the occurrence of air column resonance reliably only at the start after the completion of defrosting, and the risk of the occurrence of air column resonance At the time of normal startup with a small amount of noise, it has the effect of avoiding the adverse effect of giving discomfort due to a change in rotational sound that occurs due to a change in rotational speed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Embodiment 1)
1 is a cross-sectional view of a compressor of a refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a block diagram of the refrigerator operation control apparatus according to Embodiment 1 of the present invention.

  In FIG. 1, the compressor 1 includes a sealed container 2, an electric element 3, and a compression element 4, and the compression element 4 sucks and compresses the refrigerant in the internal space 5 of the sealed container 2. A suction port 6 for sucking refrigerant opens into the internal space 5 of the sealed container 2. The electric element 3 is driven and controlled by the control means 7.

  The operation of such a configuration will be described below with reference to the block diagram of FIG. For example, when the temperature of the storage room obtained from a storage room temperature sensor (not shown) of the refrigerator is higher than a predetermined temperature, the control unit 7 instructs the electric element 3 to start operation. The number of revolutions of the electric element 3 at this time is an appropriate value based on information such as the outside temperature obtained from the outside temperature sensor (not shown) by the number of revolutions selection means 8 and the temperature of the storage room obtained from the storage room temperature sensor. Set to Next, the rotation speed adjustment means 9 instructs the control means 7 to operate the electric element 3 at a rotation speed lower than the rotation speed set by the rotation speed selection means 8 for a predetermined time. Accordingly, the compression element 4 is first driven at the rotational speed designated by the rotational speed adjusting means 9 and then driven at the rotational speed set by the rotational speed selecting means 8.

  As described above, the refrigerator according to the present embodiment includes the sealed container 2, the electric element 3 inside thereof, and the compression element 4 that is driven by the electric element 3 and that has the gas suction port 6 opened in the sealed container 2. The compressor 1, the control means 7 for driving and controlling the electric element 3, and the rotation speed selection means 8 for selecting the rotation speed of the electric element 3 from a plurality of preset rotation speeds. Since the predetermined time at the time of starting is provided with the rotation speed adjusting means 9 for operating the electric element 3 at the rotation speed originally selected after operating the electric element 3 at a rotation speed lower than the rotation speed originally selected. When the pressure in the hermetic container 2 at the time of starting the compressor 1 is not sufficiently reduced, the occurrence of air column resonance can be avoided when air column resonance is likely to occur at a higher rotational speed than the originally selected rotational speed. Offering a low-noise refrigerator That.

  When the rotation speed selected at the time of starting the compressor 1 is the minimum rotation speed set by the rotation speed selection means, the electric element 3 is kept at a rotation speed higher than the rotation speed originally selected at the time of startup for a predetermined time. After the operation, by operating the electric element 3 at the originally selected number of revolutions, the compressor 1 is rotated at a number of revolutions lower than the minimum number of revolutions set by the revolution number selection means 8 so that the compression element The occurrence of air column resonance can be avoided while preventing a decrease in reliability due to running out of oil at the sliding portion 4.

  In addition, by operating the electric element 3 at a rotational speed higher than the originally selected rotational speed for a predetermined time when the compressor 1 is started, When the pressure in the hermetic container 2 at the time of starting the compressor 1 is not sufficiently reduced, the occurrence of air column resonance can be avoided when air column resonance is likely to occur on the rotation speed side lower than the originally selected rotation speed. .

  When the rotation speed selected at the time of starting the compressor 1 is the maximum rotation speed set by the rotation speed selection means, the electric element 3 is kept at a rotation speed lower than the rotation speed originally selected at the start-up for a predetermined time. After the operation, by operating the electric element 3 at the originally selected rotation speed, the compressor 1 rotates at a rotation speed higher than the minimum rotation speed set by the rotation speed selection means. It is possible to avoid the occurrence of air column resonance while preventing a decrease in mechanical reliability such as wear.

  Further, after the compressor 1 is started, the electric element 3 is operated at the originally selected rotation speed after operating the electric element 3 by changing the rotation speed to a plurality of rotation speeds different from the originally selected rotation speed. 3, when the pressure in the hermetic container 2 at the time of starting the compressor 1 is not sufficiently reduced, it is possible to cope with the change in the number of rotations at which air column resonance occurs due to pressure fluctuations. Occurrence can be avoided more.

  Further, after operating the electric element 3 by changing the rotation speed so that the predetermined time at the time of starting the compressor 1 is different from the rotation speed originally selected and close to the rotation speed originally selected steplessly. When the electric element 3 is operated at the originally selected number of revolutions, when the pressure in the sealed container 2 at the time of starting the compressor 1 is not sufficiently reduced, the number of revolutions at which air column resonance occurs due to pressure fluctuations changes. By doing so, it is possible to cope with it reliably, and the occurrence of air column resonance can be avoided more reliably.

  Further, the rotation speed adjusting means 9 is limited to the start-up after turning on the power of the refrigerator, so that the pressure change in the airtight container 2 is severe and the air column resonance is reliably ensured only at the start-up after turning on the power. The time until the pressure in the airtight container 2 is stabilized is relatively fast and the risk of occurrence of air column resonance is low. It is possible to avoid the adverse effect of giving discomfort.

  In addition, by limiting the rotation speed adjusting means 9 at the time of activation after the completion of defrosting, the pressure change in the sealed container 2 is severe and the air column resonance can be reliably ensured only at the time of activation after the completion of defrosting where air column resonance is likely to occur. While avoiding the occurrence, the time until the pressure in the sealed container 2 stabilizes is relatively fast and the risk of air column resonance occurring is low. It is possible to avoid the harmful effect of giving

  As described above, the refrigerator according to the present invention can avoid the occurrence of air column resonance accompanying the pressure change in the hermetic container of the compressor, becomes a refrigerator with less noise, and includes the compressor with a variable rotation speed type. It is useful for the use of the equipment in the technical field.

Compressor sectional view of a refrigerator according to Embodiment 1 of the present invention The block diagram of the operation control apparatus of the refrigerator by Embodiment 1 of this invention The block diagram which showed the structure of the control apparatus of the conventional refrigerator Flowchart of a conventional refrigerator control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Airtight container 3 Electric element 4 Compression element 7 Control means 8 Rotation speed selection means 9 Rotation speed adjustment means

Claims (9)

A compressor including an airtight container, an electric element therein, a compression element driven by the electric element and having a gas inlet opening in the airtight container, and a control means for driving and controlling the electric element; It comprises a rotation speed selection means for selecting the rotation speed of the electric element from a plurality of rotation speeds set, and the electric element is operated at a rotation speed different from the originally selected rotation speed for a predetermined time when starting the compressor. A refrigerator provided with a rotation speed adjusting means for operating the electric element at a rotation speed originally selected later. The refrigerator according to claim 1, wherein when the compressor is started, the electric element is operated at a rotational speed originally selected after the electric element is operated for a predetermined time at a lower rotational speed than the originally selected rotational speed. When the rotation speed selected at the time of starting the compressor is the minimum rotation speed set by the rotation speed selection means, after the electric element is operated for a predetermined time at a rotation speed higher than the rotation speed originally selected at the time of startup, The refrigerator according to claim 2, wherein the electric element is operated at a rotation speed originally selected. 2. The refrigerator according to claim 1, wherein when the compressor is started, the electric element is operated at a rotation speed higher than the originally selected rotation speed and then the electric element is operated at a rotation speed originally selected. When the rotation speed selected at the time of starting the compressor is the maximum rotation speed set by the rotation speed selection means, after starting the electric element at a rotation speed lower than the rotation speed originally selected at the time of startup, The refrigerator according to claim 4, wherein the electric element is operated at a rotation speed originally selected. Rotation of operating the electric element at the originally selected rotation speed after operating the electric element by changing the rotation speed to a plurality of rotation speeds different from the originally selected rotation speed for a predetermined time at the start of the compressor The refrigerator as described in any one of Claims 1-5 provided with the number adjustment means. The predetermined time at the time of starting the compressor is originally selected after operating the electric element by changing the rotation speed so that the rotation speed is different from the originally selected rotation speed and approaching the rotation speed originally selected steplessly. The refrigerator as described in any one of Claims 1-5 provided with the rotation speed adjustment means which operate | moves the said electrically-driven element with the increased rotation speed. The refrigerator according to any one of claims 1 to 7, wherein the rotation speed adjusting means is limited to startup after the refrigerator is turned on. The refrigerator according to any one of claims 1 to 7, wherein the rotation speed adjusting means is limited to startup at the end of defrosting.

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