JPH05118626A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide an air conditioner in which a compressor can be operated practically at the number of rotation approximating to its target number of rotation and a low vibration occurs in it. CONSTITUTION:In an air conditioner 1, a curve Fa expressing a relation between an operating frequency M of a compressor 2 and an inverse number 1/Am of the maximum amplitude value at each of the portions of the air conditioner 1 is set in advance by a control part 6 of the air conditioner. Then, an operation part 4 for calculating a temporary number of rotation of the compressor calculates a temporary operating frequency Mt to be applied as a target for the compressor 2 in response to the air conditioning data such as a room temperature and the like. Then, the control part 6 of the compressor makes a membership function Fm based on the temporary operating frequency Mt and sets a range of number of rotation having a desired width based on the temporary operating frequency Mt by using the membership function Fm and the curve Fa. Then, the segment 9 for determining the number of rotation of the compressor determines the operating frequency Ma of the compressor 2 getting the maximum amplitude width which is the most suitable in the operating frequency range having the desired width in reference to the curve Fa and then outputs it to the compressor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner that adjusts the air conditioning capacity by controlling the rotational speed of a compressor that compresses a refrigerant, and more particularly to an air conditioner that maintains practical air conditioning capacity. The present invention relates to an air conditioner capable of suppressing vibration of each part.

[0002]

2. Description of the Related Art As a home or industrial air conditioner
For example, refrigerating the room air according to the temperature and humidity conditions.
By controlling the number of revolutions of the compressor in the cycle,
Widely used are those that adjust the air temperature and humidity
There is. By the way, in the above-mentioned air conditioner
Determines the number of revolutions of the compressor.
Operating frequency and resonance frequency of any part of the air conditioner
The number may be the same value. Empty in such cases
Vibration and noise of the air conditioner become very large,
When operating for a long time at the wave number, in the worst case, the above vibration may cause
The refrigerant pipe may be damaged. So big
The rotation speed of the compressor should be controlled without causing vibration.
An example of an air conditioner that can be used is shown in FIG. Shown in the figure
Air conditioner 1_aThen, it is detected by the air conditioning data detection unit 3.
Indoor heat exchanger or outdoor heat exchanger for refrigeration cycle
Room (such as outside temperature), room temperature, outside temperature, etc.
Based on the air conditioning data required for air conditioning of the inside air
The compressor control unit 6_aIs the optimum operating frequency of the compressor 2
And the compressor speed is controlled according to this operating frequency.
It is designed to be controlled. Specifically, the compressor 2
Operating frequency (corresponding to the rotation speed) and the air conditioner 1 _aNoi
From a plurality of vibration detection units 5 provided in some parts
Determine the relationship with the maximum amplitude value in advance, and determine whether these relationships
The operating frequency at which the above vibration can be operated in a sufficiently small state
Select one of these operating frequencies and select one of these operating frequencies.
The compressor 2 was controlled by. As above
Maximum amplitude value A_mAnd operating frequency corresponding to the number of revolutions of compressor 2
The relationship with the number M is shown in the curve of FIG. In FIG. 7, D
1 to D6 are 6 operating frequencies when the vibration is small to some extent
It shows several steps, which are preset from the above curve.
The compressor control unit 6_aStored in memory outside the figure
There is. The compressor 2 is a power source output to the compressor 2.
Rotates at a frequency of almost the same value for a signal related to frequency
It is known that the rotation frequency detection unit
It is not necessary to provide it, and the frequency of the signal output to the compressor 2 is
The wave number is the operating frequency M. The air conditioner 1_a
Then, the air conditioning detected by the air conditioning data detection unit 3
Compressor control unit 6 based on the sum data_aIs a temporary operating frequency
Then, for example, the value closest to the tentative operating frequency
One of the operating frequency steps D1 to D6 of
Was output as the operating frequency M of the compressor 2. to this
Therefore, the air conditioner 1_aWhile suppressing the vibration of
The compressor 2 could be controlled practically. one
On the other hand, as another example of the air conditioner as described above, FIG.
Air conditioner 1 to show_bIs mentioned. The air conditioner 1_b
According to the compressor temporary rotation speed calculation unit 4_aIs the air conditioning
Based on the air conditioning data from the data detector 3,
The tentative operating frequency J to be determined is determined and is determined by the compressor control unit 6
_bOutput to. Therefore, the compressor control unit 6_bIs above
The compressor 2 is temporarily operated according to the provisional rotation frequency J,
Air conditioner 1 detected by the vibration detection unit 5_bOf vibration
Whether the size (amplitude) exceeds the preset reference value
Determine if there is not. Then, the above amplitude is equal to the above reference value.
If it does not exceed, keep the above provisional rotation frequency J
The compressor 2 was operated, and if it was exceeded, it was detected at that time.
The amplitude K is stored. Next, from the tentative operating frequency J above,
Operate at a smaller operating frequency by a constant width, and change the amplitude L at this time.
Detect and store. On the contrary, from the above tentative operating frequency J
Operate at a higher operating frequency by a specified width, and change the amplitude P at this time.
Detect and store. Then, the stored amplitude K,
Extract the amplitude of the smallest value of L and P, and
The compressor 2 is operated at the corresponding operating frequency.
Growling. The above amplitudes K, L, and P are all above
If the specified value is exceeded, at least the minimum amplitude
The same process is repeated until the value falls below the standard value above.
Then, the operating frequency is changed and determined. However
However, the amplitude K at the above-mentioned provisional operating frequency J is
When the value is smaller than L and P, for example, the minimum value, the above temporary
The compressor 2 is operated at the operating frequency J as it is.

[0003]

By the way, the above-mentioned conventional
Air conditioner 1_aAccording to (Fig. 6), the vibration of each part of the air conditioner
Small operating frequency steps are reasonably determined before shipping
Even if the air conditioner is installed
Installation for each product due to differences in installation location etc.
There may be a difference between the front and back. For example, the curve shown in Figure 9
Shows an extremely bad example, and the solid line shows the curve.
What was measured in advance by experiments before loading (the curve in Fig. 7
Corresponding to the above), and the curve shown by the broken line is the same product.
It was measured after it was actually installed in the place. This
In particular, in the operation frequency stage D5, before shipment and installation
The maximum amplitude values after attachment are widely separated.
Part 6_aThe operating frequency step D5 is determined by
When the compressor 2 is operated by this, the air conditioner 1_aIs non
It will always be accompanied by large vibrations. On the other hand, the conventional empty
Air conditioner 1_bAt the operating frequency M and the maximum amplitude value
A _mAlthough the relationship with is not set in advance,
In the case of the relationship of curves as shown in
When the above-mentioned provisional operating frequency is a, this provisional operating frequency is
Maximum amplitude value A at a_mIs a minimum value,
Depending on the change width of the operating frequency M region from the operating frequency a of
The compressor 2 is operated at the temporary operating frequency a.
Control is performed with an amplitude larger than the reference value α.
Will be. On the other hand, for example, the temporary operation calculated above
If the frequency is b, there is a slight difference from this temporary operating frequency b.
If the driving frequency is N, the amplitude is extremely small.
Despite being able to operate in the frequency domain,
Maximum amplitude value A corresponding to this provisional operating frequency b_mIs the standard
Since it is below the value α, the compressor 2 is
It is operated as it is for a few b and is accompanied by relatively large vibration.
Become. As mentioned above, it is close enough to the target operating frequency.
It is a small value and can reduce the above vibration.
It is not possible to perform arithmetic processing to determine the operating frequency
There is no such algorithm, but this kind of processing is performed by a general algorithm.
If you try to reveal it, the algorithm itself becomes extremely complicated.
It is especially used for controlling home air conditioners.
With the configuration of a one-chip microcomputer
Is difficult to realize. Therefore, the purpose of the present invention is
In practice, drive the compressor at a rotational speed that is close to the target for practical use.
It is possible to reduce the vibration
To provide an air conditioner.

[0004]

In order to achieve the above object, the main means adopted by the present invention is, in summary, an air conditioner having a refrigeration cycle having at least a compressor for compressing a refrigerant. The air for controlling the rotation speed of the compressor based on the detected air-conditioning data and the preset relationship between the rotation speed of the compressor and the maximum amplitude value of the air conditioner when performing air conditioning by In the air conditioner, temporary output value calculating means for calculating a temporary output value of the rotational speed of the compressor according to the detected air conditioning data, and rotation of a predetermined width based on the temporary output value of the calculated rotational speed. Compressor control means for determining and outputting the number of revolutions of the compressor that obtains the best maximum amplitude value in several ranges from the relationship between the preset number of revolutions of the compressor and the maximum amplitude value of the air conditioner. Shi It is configured as an air conditioner according to become points. Further, the predetermined width of the rotational speed region in the above configuration is determined by a membership function of a predetermined shape having a tentative output value of the calculated rotational speed and a centroid value that matches in the rotational speed region. Is also good.

[0005]

In the air conditioner according to the present invention, the relationship between the rotation speed of the compressor of the refrigeration cycle and the maximum amplitude value of the air conditioner is preset. Therefore, the temporary output value calculation means calculates the temporary output value of the rotation speed of the compressor according to the detected air conditioning data. Then, the compressor control means sets the rotation speed of the compressor that obtains the best maximum amplitude value in the rotation speed region of the predetermined width based on the calculated temporary output value of the rotation speed to the rotation speed of the preset compressor. It is determined from the relationship between the number and the maximum amplitude value of the air conditioner. The determined rotation speed is output to the compressor, and the compressor is drive-controlled based on the output rotation speed. Therefore, the compressor is operated relatively close to an appropriate provisional output value to be controlled according to the detected air conditioning data, and the air conditioner has a small maximum amplitude value. In the case where the predetermined width of the rotational speed region is determined by using a membership function having a predetermined shape as described above, for example, a triangular membership function having the apex toward the best maximum amplitude value. In addition to the fact that the vibration of the air conditioner can be reduced compared to the case where the predetermined width based on the temporary output value of the rotational speed is the same width, the temporary output value of the rotational speed that should be the target value can be reduced. The compressor can be operated at a rotation speed closer to the above.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention. Here, FIG. 1 is a block diagram showing the outline of the processing of the rotation speed control of the compressor of the air conditioner according to one embodiment of the present invention, FIG.
Is a block diagram showing a schematic configuration of the air conditioner, and FIG. 3 is a reciprocal of a maximum amplitude value of the air conditioner stored in a memory of a compressor control unit of the air conditioner and an operating frequency of the compressor. FIG. 4 is a graph showing a curve showing the relationship of FIG. 4, FIG. 4 is an enlarged view of the curve of FIG. 3 around the provisional operating frequency calculated by the compressor provisional speed calculating unit of the air conditioner in the operating frequency direction, and the provisional operating frequency is And a triangular membership function having the same center-of-gravity value in the above-mentioned operating frequency region, which are shown in a superimposed manner. FIG. 5 illustrates only the overlapping portion of the curve shown in FIG. 4 and the membership function. It is a figure. However, the same reference numerals are used for the elements common to the conventional air conditioners 1 _a and 1 _b shown in FIGS. 6 and 8, and the detailed description thereof will be omitted. As shown in FIG. 2, the air conditioner 1 according to the present embodiment constitutes a refrigeration cycle together with an indoor heat exchanger, an outdoor heat exchanger, a refrigerant expansion mechanism, and a refrigerant pipe connecting these elements, which are not shown in the figure, to form a refrigerant. A compressor 2 for compression, an air-conditioning data detection unit 3 that detects the air-conditioning data, and a temporary operating frequency that should be a target of the compressor 2 according to the detected air-conditioning data (rotation speed Temporary output value) M _t of the compressor temporary rotation speed calculation unit 4, a plurality of vibration detection units 5 provided in each part of the air conditioner 1 for detecting vibration of the part, and the temporary compressor rotation speed. The compressor 2 based on the relationship between the provisional operating frequency M _t from the computing unit 4, the preset operating frequency M of the compressor 2 and the reciprocal 1 / A _m of the maximum amplitude value of the air conditioner 1. And the compressor control unit 6 for controlling the operating frequency (rotation speed) of It has become Ete. The vibration detecting section 5 is attached at one or more places in the body of the air conditioner 1 where vibration may generate noise or cause partial destruction. The air conditioner 1 according to this embodiment is configured as described above.

The operation of the air conditioner 1 will be described below with reference to FIG. First, the actual revolution speed and the maximum amplitude value relationship calculating section 8 of the compressor control unit 6, the reciprocal 1 / A of the maximum amplitude value A _m from the vibration detecting unit 5 corresponding to the operating frequency M of the compressor 2 _It has a function to calculate the relationship with _m over the entire operating frequency range. The reciprocal 1 / A _m of the maximum amplitude value indicates that the larger the value, the smaller the vibration, that is, the degree of functional satisfaction. A conversion table is prepared in advance, and vibration detection is performed based on the conversion table. It is adapted to be readily determined from the maximum amplitude value a _m from part 5. The reciprocal 1 /
As the value of A _m , when the product is shipped, a typical value (curve or the like) obtained in advance by experiments or the like, or a value of all 1 is the compressor control unit 6 over all the above operating frequency regions.
Stored in the memory M in advance. These values are rewritable at any time, and after the air conditioner 1 is actually installed in the proper place after shipment, a test operation is performed over the entire range while changing the rotation frequency of the compressor 2, and vibration at this time is performed. The relationship with the reciprocal 1 / A _m of the maximum amplitude value obtained from the maximum amplitude value A _m from the detection unit 5 is obtained, for example, as a curve F _a . A curve F _a showing the relationship as described above, which is actually obtained by the test operation after the installation of the air conditioner 1, is as shown in FIG. 3, and is rewritably stored in the memory M.
On the other hand, based on the air-conditioning data detected by the air-conditioning data detecting unit 3, the temporary compressor rotation speed calculating unit 4 calculates the target temporary operating frequency M _t of the compressor 2 for the air-conditioning data at this time. To do. The temporary operation frequency M _t is input to the rotation speed region predetermined width setting unit 7 of the compressor control unit 6. That is, the provisional output value computing means of the present invention is means for realizing the function of computing the provisional output value of the rotation number of the compressor in accordance with the air conditioning data detected by the compressor provisional rotation number computing unit 4. is there.

Then, in the rotation speed region predetermined width setting unit 7,
Is the temporary operating frequency M calculated above. _tAnd above operating frequency
The centroid value that matches in the range (compressor speed range)
Has, the reciprocal 1 / A of the maximum amplitude value_mEquipped with vertices in the direction of
, An isosceles triangular mesh with a base in the operating frequency direction.
Nambaship function F_mTo create. And the above compressor control
The compressor rotation speed determination unit 9 of the control unit 6 determines the actual rotation speed vs. maximum amplitude.
Curve F from the value relation calculation unit 8_aAnd the rotation speed range specified above
Membership function F from width determination unit 7_mSuperimpose
(See FIG. 4), a curve F composed of these overlapping parts_c
Ask for. Then, the compressor rotation number determination unit 9
Line F_cAt the above reciprocal 1 / A_mThe maximum of, ie the best
Maximum amplitude value A_mOperating frequency M of compressor _aDecide
(See FIG. 5), this operating frequency M_aTo compressor 2 above
Force That is, the rotation speed region predetermined width of the compressor control unit 6 is determined.
Part 7, actual rotation speed vs. maximum amplitude value relationship calculation part 8 and compressor rotation
In the number-of-turns determining unit 9, the temporary output of the number of rotations calculated above is output.
The best maximum amplitude in the speed range of a given width based on the value
The number of revolutions of the compressor that obtains the value is determined by the preset compressor.
Determined from the relationship between the engine speed and the maximum amplitude of the air conditioner
The means for realizing the function of outputting and outputting is the compressor control of the present invention.
It is a means. In the case of the above embodiment, the rotation speed range of the above predetermined width
The area is the superposed curve F_cWithin the range occupied by
is there. The operating frequency M calculated above_aIs targeted
Temporary operating frequency M_tFrequency near and near
In the region, at the operating frequency with sufficiently small vibration (amplitude)
I know there is. The above operating frequency M_aIs calculated as
Requires special arithmetic processing using complex algorithms
No, membership function F_mOr when creating straight line L and curve
F_cSimple addition, subtraction and
And numerical comparison only. Obey
Thus, the arithmetic processing of this embodiment as described above is performed by a general-purpose 1-chip.
It is relatively easy to implement even with a microcomputer.
It is possible to

In the above embodiment, the compression for obtaining the best maximum amplitude value from the relationship between the preset operating frequency M of the compressor 2 and the reciprocal 1 / A _m of the maximum amplitude value of the air conditioner 1 Temporary operating frequency M _t calculated by the temporary machine speed calculator 4
As a method of determining the predetermined width of the operating frequency region based on the above, the above-mentioned triangular membership function is used, but the present invention is not limited to this, and for example, a trapezoidal membership function may be used. Further, the provisional operation frequency M _t is not limited to these membership functions, and the predetermined width is as shown in FIG.
To a straight line L with a predetermined width of W in the direction of the operating frequency range
May be set individually, and this also produces the corresponding effect. However, compared with the width W _a from the tentative operating frequency M _t when the triangular membership function F _m is set as described above, the operating frequency M _a ′ output to the compressor 2 is the tentative operating frequency. The value is far from the frequency M _t . The apparatus of the present embodiment can operate the compressor with a small amplitude of vibration of the air conditioner and at a value sufficiently close to the target operating frequency by the simple calculation method as described above.

[0010]

As described above, according to the present invention, at the time of performing air conditioning by an air conditioner having a refrigeration cycle having a compressor for compressing a refrigerant, the detected air conditioning data and the In an air conditioner that controls the rotation speed of the compressor based on the relationship between the set rotation speed of the compressor and the maximum amplitude value of the air conditioner,
Temporary output value calculating means for calculating a temporary output value of the rotational speed of the compressor according to the detected air conditioning data, and the best in a rotational speed region of a predetermined width based on the calculated temporary output value of the rotational speed. And a compressor control means for determining and outputting the number of revolutions of the compressor for obtaining the maximum amplitude value from the relationship between the preset number of revolutions of the compressor and the maximum amplitude value of the air conditioner. An air conditioner characterized by the above is provided. As a result, it is possible to drive the compressor at a rotation speed close to the target and perform operation with sufficiently small vibration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of processing for controlling a rotation speed of a compressor of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of the air conditioner.

FIG. 3 is a graph showing a curve representing the relationship between the approximate number of maximum amplitude values of the air conditioner stored in the memory of the compressor control unit of the air conditioner and the operating frequency of the compressor.

FIG. 4 is a center of gravity that expands the curve of FIG. 3 around the temporary operating frequency calculated by the compressor temporary speed calculating unit of the air conditioner in the operating frequency direction and matches the temporary operating frequency in the operating frequency range. FIG. 6 is a graph chart in which a triangular membership function having a value and a membership function are overlapped and described together.

FIG. 5 is an explanatory diagram illustrating only the overlapping portion of the curve and the membership function shown in FIG.

FIG. 6 is a block diagram showing a schematic configuration of a conventional air conditioner as an example of the background of the present invention.

7 is a curve showing the relationship between the operating frequency of the compressor preset in the air conditioner of FIG. 6 and the maximum amplitude value of the conventional air conditioner, and the operation in which the maximum amplitude value is relatively low in the curve. The graph figure which shows a frequency step.

FIG. 8 is a block diagram showing a schematic configuration of a conventional air conditioner that is another example of the background of the present invention.

FIG. 9 is a graph showing both the curve shown in FIG. 7 and the curve measured after shipping and installing the conventional air conditioner.

FIG. 10 is an explanatory diagram showing a mode of operating frequency determination according to a maximum amplitude width by a compressor control unit of the air conditioner of FIG. 8.

[Explanation of symbols]

1, 1 _a , 1 _b ... Air conditioner 2 ... Compressor 3 ... Air conditioner data detection unit 4, 4 _a ... Compressor temporary rotation speed calculation unit 5 ... Vibration detection unit 6, 6 _a , 6 _b ... Compressor control part 7 ... speed range predetermined width setting section 8 ... rotational speed actual revolution speed and the maximum amplitude value relationship calculating section 9 ... compressor determining unit F _m ... membership function F _a ... curve M _t ... temporary operating frequency M _a, M _a '... Operating frequency W ... Setting width

Claims (2)

[Claims] 1. When air conditioning is performed by an air conditioner including at least a refrigeration cycle having a compressor for compressing a refrigerant, detected air conditioning data, preset rotational speed of the compressor, and the above In an air conditioner that controls the rotational speed of the compressor based on the relationship with the maximum amplitude value of the air conditioner, a temporary output value of the rotational speed of the compressor is calculated according to the detected air conditioning data. The provisional output value computing means and the number of revolutions of the compressor that obtains the best maximum amplitude value in the number of revolutions of a predetermined width based on the calculated provisional output value of the number of revolutions is the number of revolutions of the preset compressor. And a compressor control means for determining and outputting the maximum amplitude value of the air conditioner. 2. The predetermined width of the rotational speed region is determined by a membership function of a predetermined shape having a centroid value that matches the tentative output value of the calculated rotational speed in the rotational speed region. Air conditioner.