JP2019190820A - Liquid surface state determination device, freezing device including the same and liquid surface state determination program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid surface state determination device capable of improving efficiency of a work of checking a liquid surface in a device and reducing human error and variation in evaluation. An apparatus that constitutes a refrigerating apparatus and determines a liquid surface state in a device containing a liquid therein. The confirmation unit 20 for confirming the liquid surface in the device, the image capturing unit 30 for capturing the liquid surface confirmed by the confirmation unit 20, the recognition unit for recognizing the liquid surface image captured by the image capturing unit 30, and the recognition unit. And a calculation unit including a determination unit that classifies the recognized image into one of a plurality of preset classifications. [Selection diagram] Figure 2

Description

The present invention relates to a liquid level state discriminating apparatus, a refrigeration apparatus provided with the same, and a liquid level state discriminating program.

  The lack of oil inside the compressor of the refrigeration system, the overflow of liquid refrigerant inside the accumulator, that is, the phenomenon that the liquid refrigerant accumulates in the accumulator and the liquid refrigerant overflows from the accumulator, and further constitutes the refrigeration apparatus Leakage of refrigerant from the equipment to be used may lead to problems such as seizure of the compressor, which affects the reliability of the refrigeration apparatus.

  Conventionally, various countermeasures have been studied for such a problem. In order to prevent the problem of running out of oil in the compressor, when a state where the detected value by the outside air temperature sensor is higher than the set value continues for a predetermined time, the forced In particular, it has been proposed to perform an oil return operation (see, for example, Patent Document 1).

  Further, when the suction superheat degree or the discharge superheat degree of the compressor falls below a predetermined target value for a predetermined time, it is determined that the refrigerant inside the accumulator has overflowed, and the compressor is stopped and stopped. It has been proposed to move a refrigerant from an outdoor unit having a compressor to an outdoor unit having a driven compressor (see, for example, Patent Document 2).

JP 2011-149659 A JP 2010-164219 A

  By the way, as a premise to implement measures against oil shortage and overflow as described above, by measuring the degree of oil shortage and overflow in the process of manufacturing the refrigeration system, by taking predetermined measures as necessary, Increasing the reliability of refrigeration equipment has been done.

  Usually, in order to measure the degree of oil shortage or overflow as described above, the amount of oil (in the case of a compressor) or the amount of liquid refrigerant (accumulator) accumulated inside each device, called a level gauge, is stored in the compressor or accumulator. In this case) is provided. Then, the amount of oil or liquid refrigerant in the device that can be seen from the outside via the liquid level gauge is imaged by an imaging unit such as a CCD camera to measure the amount of oil or liquid refrigerant during the test operation. ing.

  However, since the tester visually confirms and evaluates the image captured by the imaging unit, human error due to visual evaluation and variations in evaluation by the tester may occur. In addition, in such a test, in addition to evaluating the captured image in real time, the captured image is often recorded and the tester confirms the recorded image, but the recording time tends to be longer. is there. In particular, when an unattended operation is performed at night and the next day is evaluated, the recording time is remarkably increased. In this case, a very large number of man-hours are required for checking the recorded image.

  The present invention has been made in view of such circumstances, and improves the efficiency of the confirmation of the liquid level in the device, and can reduce the human error and the variation in evaluation, and the liquid level state determination device An object of the present invention is to provide a refrigeration apparatus and a liquid level state determination program including the above.

The liquid level state discriminating device of the present invention (hereinafter also simply referred to as “discriminating device”)
(1) An apparatus for determining a liquid surface state in a device that constitutes a refrigeration apparatus and contains liquid therein,
A confirmation unit for confirming the liquid level in the device,
An imaging unit for imaging the liquid level confirmed by the confirmation unit;
A recognition unit that recognizes a liquid level image captured by the imaging unit, and a calculation unit that includes a determination unit that classifies the image recognized by the recognition unit into any of a plurality of preset classifications.

  The discriminating apparatus according to the present invention recognizes the liquid level image captured by the imaging unit by the recognition unit instead of visually evaluating the image by the person in charge of the test, and the image recognized by the recognition unit by the discrimination unit in advance. Since it is classified into one of a plurality of set classifications, it is possible to improve the efficiency of checking the liquid level in the device and reduce human error and variations in evaluation. The liquid level image can be recognized and classified by using generally available image recognition or image analysis software such as Caffe. In the present specification, the “liquid” means a liquid that is contained in equipment such as a compressor and an accumulator constituting the refrigeration apparatus, and includes refrigeration oil in the compressor and a liquid refrigerant in the accumulator. The purpose. Further, in the accumulator, a bubble-like refrigerant may exist in the surface layer portion of the liquid refrigerant inside, and the bubble-like refrigerant in this case is also included in the “liquid” in the present specification.

(2) The determination apparatus according to (1) further includes a learning image storage unit that stores learning image information that is information about the liquid level image,
The plurality of classifications are created by the learning image information,
The learning image information may be information learned using deep learning. In this case, it becomes easier to perform the liquid level discrimination state.

(3) In the discrimination device according to (1) or (2), it is preferable that the discrimination device further includes a display unit that displays a discrimination result of the liquid level image by the discrimination unit in time series. In this case, since the determination results are displayed in time series, the temporal change of the liquid level image can be easily grasped.

(4) In the discrimination device according to (1) to (3) above, a plurality of confirmation units and a plurality of imaging units corresponding to the number of the confirmation units are provided.
It is preferable that the calculation unit causes the recognition unit to recognize a plurality of obtained images as one image. In this case, by using a plurality of liquid level images, the liquid level state in the device can be determined with higher accuracy, and the possibility of erroneous classification can be reduced.

The liquid surface state determination program of the present invention (hereinafter also simply referred to as “discrimination program”)
(5) An image is picked up by an image pickup unit that picks up an image of a liquid level that is confirmed by a confirmation unit that confirms the liquid level in the device in order to determine a liquid level state in the device that constitutes the refrigeration apparatus and contains the liquid therein. A recognition unit that recognizes the liquid level image, and a determination unit that classifies the image recognized by the recognition unit into any of a plurality of preset classifications.

  The discrimination program of the present invention causes the recognition unit to recognize the liquid level image captured by the imaging unit, and causes the discrimination unit to classify the image recognized by the recognition unit into one of a plurality of preset classifications. In addition to improving the efficiency of checking the liquid level in the device, it is possible to reduce human error and variations in evaluation.

The refrigeration apparatus of the present invention is
(6) The discriminating device according to any one of (1) to (4), a compressor, and an accumulator are provided.

  The refrigeration apparatus of the present invention includes the above-described discrimination device. Instead of visually evaluating the image by a person in charge of the test, the liquid level image captured by the imaging unit is recognized by the recognition unit, and the recognition unit Since the recognized image is classified into one of a plurality of classifications set in advance by the discriminating unit, it is possible to improve the efficiency of checking the liquid level in the device and reduce human error and evaluation variation. it can.

(7) In the refrigeration apparatus of (6), protection control of the refrigeration apparatus may be performed when a determination result by the determination unit of the determination apparatus is within a predetermined alert range. In this case, by performing protection control of the refrigeration apparatus, it is possible to prevent problems such as seizure of the compressor due to oil shortage of the compressor or overflow of the accumulator, and to improve the reliability of the refrigeration apparatus. .

(8) In the refrigeration apparatus of (7), the warning range can be set to a predetermined liquid level or less for the compressor and to a predetermined liquid level or more for the accumulator. In this case, by performing protection control of the refrigeration apparatus when the compressor is below a predetermined liquid level or when the accumulator is above a predetermined liquid level, the compressor may run out due to oil shortage of the compressor or overflow of the accumulator. It is possible to improve the reliability of the refrigeration apparatus by preventing problems such as seizure.

(9) In the refrigeration apparatus of (7) or (8), the protection control can be any of notification of device abnormality, operation stop of the device, and oil return operation to the compressor. In this case, when the discrimination result by the discriminating unit is within a predetermined alert range, the compression of the refrigeration system is performed by performing any one of notification of device abnormality, operation stop of the device, and oil return operation to the compressor. It is possible to prevent problems such as seizing in the machine.

The liquid state discrimination device of the present invention is
(10) An apparatus for determining a liquid state in a device that constitutes a refrigeration apparatus and contains liquid therein,
A confirmation unit for confirming the liquid state in the device;
An imaging unit for imaging the liquid state confirmed by the confirmation unit;
A recognition unit that recognizes a liquid state image captured by the imaging unit, and a calculation unit that includes a determination unit that classifies the image recognized by the recognition unit into one of a plurality of preset classifications.

  The liquid state discriminating apparatus of the present invention recognizes a liquid state image, which is an image of the liquid state in the device, captured by the imaging unit, by the recognition unit, instead of visually evaluating the image by a tester. Since the image recognized by the recognition unit is classified into one of a plurality of classifications set in advance by the determination unit, the efficiency of checking the liquid state in the device is improved, and human error and evaluation variation Can be reduced. In the present specification, the “liquid state” means the state of the liquid contained in the equipment, such as the contamination of the refrigerant that is the liquid contained in the equipment constituting the refrigeration apparatus.

  According to the discriminating apparatus of the present invention, the refrigeration apparatus including the discriminating apparatus, and the discriminating program, it is possible to improve the efficiency of checking the liquid level in the apparatus and reduce human errors and evaluation variations.

It is a refrigerant circuit figure of one embodiment of the refrigerating device of the present invention. It is explanatory drawing of one Embodiment of the discrimination device of this invention. FIG. 3 is a cross-sectional explanatory view in the vicinity of a CCD camera in the determination device shown in FIG. 2. It is a block diagram of the control part shown by FIG. It is a figure which shows an example of a liquid level image. It is an example of the table | surface which shows the liquid level state of the several level of the refrigerant | coolant in an accumulator. It is the figure which displayed the liquid level which is the discrimination | determination result of a liquid level image in time series.

  Hereinafter, a discrimination device, a refrigeration apparatus including the discrimination device, and a discrimination program according to the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to the claim are included.

  FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus R according to an embodiment of the present invention. The refrigeration apparatus R is composed of an outdoor unit (outdoor unit) of an air conditioner for buildings, and mainly includes a compressor 1, an accumulator 2, an oil separator 3, a four-way switching valve 4, an outdoor heat exchanger 5, and an outdoor fan 6. , And an expansion valve 7. In FIG. 1, gas pipes and liquid pipes respectively denoted by reference numerals 9 and 10 are connected to refrigerant pipes of one or more indoor units (not shown).

  The four-way switching valve 4 can switch between a cooling operation cycle and a heating operation cycle. During the cooling operation, the connection state shown by the solid line in FIG. 1 is established, and the compressor 1 passes through the oil separator 3, the outdoor heat exchanger 5, the indoor heat exchanger (not shown), and the accumulator 2. A cooling operation cycle returning to 1 is configured. On the other hand, at the time of heating operation, a connection state indicated by a broken line in FIG. 1 is established, and the compressor 1 passes through an oil separator 3, an indoor heat exchanger (not shown), an outdoor heat exchanger 5, and an accumulator 2. A heating operation cycle returning to the compressor 1 is configured.

  The refrigeration apparatus R according to the present embodiment includes a determination device D that determines the liquid level state of the liquid refrigerant contained in the accumulator 2 that is a device constituting the refrigeration apparatus R. As shown in FIG. 2, the determination device D includes a liquid level gauge 20, a CCD camera 30, a control unit 40, and a display unit 50.

  The level gauge 20 constitutes a confirmation unit that confirms the liquid level of the liquid refrigerant in the accumulator 2. As shown in FIG. 3, the liquid level gauge 20 in the present embodiment includes a short cylindrical body 21 erected on the peripheral edge of a round hole formed in the wall surface 2 a of the accumulator 2, and a peripheral edge of the tip end of the short cylindrical body 21. 2, a circular window body 23 having a size capable of closing the round hole, and an annular fixing section 24 that fixes the window body 23 to the flange section 22. The window body 23 is made of a transparent material such as glass so that the liquid refrigerant level in the accumulator 2 can be observed from outside the apparatus. The fixing portion 24 can be fixed to the flange portion 22 using, for example, a bolt 25 and a nut 26.

  In the present embodiment, a plurality of liquid level gauges 20, specifically, three liquid level gauges 20 are provided on the wall surface 2 a of the accumulator 2. The three liquid level gauges 20 are provided along the vertical direction (vertical direction in FIG. 2) of the accumulator 2 in the installed state. The upper liquid level gauge 20a, the middle liquid level gauge 20b, A liquid level gauge 20c is configured. As will be described later, the discrimination device D of the present embodiment discriminates the liquid level state of the liquid refrigerant in the accumulator 2 using the image of the transparent window 23 of the liquid level gauge 20. If the total is 20, it may be difficult to discriminate from the image whether the region in the accumulator 2 imaged through the window 23 is filled with liquid refrigerant or whether there is no liquid refrigerant at all. is there. However, by providing a plurality of liquid level gauges 20, the boundary between the liquid part and the non-liquid part is positioned on the window body 23 of any of the liquid level gauges 20, or a window whose inside is filled with liquid refrigerant It becomes possible to co-exist the window part where no liquid refrigerant exists on the inside and the part. As a result, by comprehensively determining the three images obtained from the three liquid level gauges 20, the liquid level state of the liquid refrigerant in the accumulator 2 can be determined with higher accuracy. The number of liquid level gauges 20 is not limited to three, but may be two or four or more. In addition, in the case of an accumulator in which a relatively small volume of liquid refrigerant is accommodated, the internal liquid level state may be accurately observed even with a single liquid level gauge.

  The CCD camera 30 constitutes an imaging unit that can image the liquid level of the liquid refrigerant in the accumulator 2 through the window body 23, and as shown in FIG. 3, the window body 23 of the liquid level gauge 20. A predetermined distance, for example, a distance of about 5 cm, is disposed in front of the window 23. In the present embodiment, a total of three CCD cameras 30 are arranged corresponding to each of the three liquid level gauges 20. A moving image including the window 23 portion of the level gauge 20 is captured by the CCD camera 30, and the captured moving image is transmitted to the control unit 40.

  The control unit 40 includes a microcomputer or the like, and includes a reception unit 41 that receives an image signal from the CCD camera 30, a calculation unit 42, a storage unit 43, and a transmission unit 44. The calculation unit 42 includes a CPU that functions as a center of calculation processing, and functionally includes a recognition unit 45 and a determination unit 46. The result of the processing by the calculation unit 42 is transmitted from the transmission unit 44 to the display unit 50 connected to the control unit 40.

  The storage unit 43 includes a ROM in which a control program (including a discrimination program) of the calculation unit 42 is stored, and data or the like is temporarily written when the calculation unit 42 performs a control operation, or the written data Is composed of a RAM from which data is read out. The discrimination program of the present embodiment is a CCD camera 30 that images the liquid level confirmed by the liquid level meter 20 for confirming the liquid level in the accumulator 2, and the control unit 40 for discriminating the liquid level state of the accumulator 2. A recognition unit 45 that recognizes the picked-up liquid level image, and a determination unit 46 that classifies the image recognized by the recognition unit 45 into any of a plurality of preset categories.

  The display unit 50 is configured by, for example, a liquid crystal display element, a plasma display element, a CRT, or the like for displaying a determination result described later in time series.

  Next, an example of a method for determining the liquid level state of the liquid refrigerant in the accumulator 2 using the above-described determination device D will be described. In the discrimination method exemplified below, the operator does not visually discriminate the liquid level state, but automatically classifies image data captured using the CCD camera 30, and digitizes the liquid level of the liquid refrigerant in the accumulator 2. Is output.

  First, a region including the window 23 of the liquid level gauge 20 provided in the accumulator 2 is imaged as a moving image using the CCD camera 30. The captured image (moving image) is transmitted to the receiving unit 41 of the control unit 40, and the image received by the receiving unit 41 is stored in the storage unit 43 of the control unit 40.

  Next, the calculation unit 42 converts the image (moving image) stored in the storage unit 43 into a still image. For example, a still image can be acquired from a moving image at an interval or frequency of 1 sheet / second.

  Next, the acquired still image is recognized by the recognition unit 45 of the calculation unit 42, and the still image recognized by the recognition unit 45 is one of a plurality of classifications set in advance by the determination unit 46 of the calculation unit 42. It is classified into crab. In the present embodiment, images of the liquid levels of the three liquid level meters 20 of the accumulator 2 are acquired. For this reason, the calculation unit 42 obtains three images obtained at the same time, that is, an image 27a from the upper liquid level gauge 20a, an image 27b from the middle liquid level gauge 20b, and an image 27c from the lower liquid level gauge 20c. For example, a process for grouping into one image 28 as shown in FIG. 5 is performed. The recognition unit 45 recognizes this image 28.

  Recognition and classification of the still image which is the image (liquid level image) indicating the liquid level state described above can be performed by using generally available image recognition or image analysis software such as Caffe, and the control unit 40. The storage unit 43 stores such image recognition or image analysis software in advance.

  When image classification processing is performed using image analysis software such as Caffe, learning image information (learning model) that is information relating to the liquid level image is generated in advance, and the generated learning image information functions as a learning image storage unit. It is stored in the storage unit 43. Such learning image information is information learned using deep learning, and a plurality of classifications of the liquid level state of the accumulator are generated by the learning image information.

The learning image information that is information related to the liquid level image used in the present embodiment can be generated as follows, for example.
First, for an accumulator having the same specifications as the accumulator for which the liquid level state is to be determined, images of various liquid level states are collected as a teacher image from past recorded images. In the present embodiment, since the liquid level state of the accumulator provided with three liquid level gauges is determined, images of various liquid level states are collected for the accumulator similarly provided with three liquid level gauges, as shown in FIG. In this way, an image obtained by combining three images into one image is input to the image analysis software. At that time, for each of the collected images (a group of three images), a classification value is given by visual judgment of the operator, and the classification value and the image are linked and input to image analysis software. FIG. 6 is an example of a table showing liquid level states at a plurality of levels of refrigerant in an accumulator equipped with three liquid level gauges. In the illustrated table, the liquid surface state is classified into 12 cases. The classification itself may be classified into less than 12 cases or more than 12 cases.

  In the example shown in FIG. 6, each liquid level gauge is classified into four liquid level states, and the total is classified into 12 cases. The classification “1” is the state where the liquid level is the smallest, the liquid level of the upper liquid level gauge 20a and the middle liquid level gauge 20b is 0%, that is, the liquid refrigerant is not observed, and the liquid of the lower liquid level gauge 20c. The surface level is in the range of 0% to 24%. Moreover, the classification “12” is the state in which the liquid amount is the largest, and the liquid level of the medium level gauge 20b and the lower liquid level gauge 20c is 100%, that is, the liquid level is observed with the middle liquid level gauge 20b and the lower liquid level gauge 20c. In this range, the liquid level is full, and the liquid level of the upper liquid level gauge 20a is in the range of 75% to 100%. In general, if the classification is “12” or more, there is a possibility of overflow.

When one united image 28 is input to the above-described learning image information by the calculation unit 42, the feature of the input image 28 is captured, and any one of classification values 1 to 12 is output. In this way, in the present embodiment, the liquid level in the accumulator 2 can be mechanically and automatically converted into any one of classification values 1 to 12 and output.
FIG. 7 shows a time-series display example of the liquid level, which is the determination result of the liquid level image. In the example shown in FIG. 7, the liquid level is converted into one of 1 to 20 classification values and output for 100 images obtained continuously at predetermined intervals.

  In the refrigeration apparatus R according to the present embodiment, protection control of the refrigeration apparatus R can be performed when the determination result by the determination unit 46 of the determination apparatus D is within a predetermined alert range. In this case, by performing protection control of the refrigeration apparatus R, it is possible to prevent problems such as seizure of the compressor 1 due to running out of oil in the compressor 1 or overflow of the accumulator 2, and to improve the reliability of the refrigeration apparatus R. Can be improved.

  As a warning range of the refrigeration apparatus R, for example, the compressor 1 can be set to a predetermined liquid level or lower, and the accumulator 2 can be set to a predetermined liquid level or higher. Further, the protection control can be any one of notification of device abnormality, stop of device operation, and oil return operation to the compressor 1. When the determination result by the determination unit 46 is within a predetermined warning range, the compression of the refrigeration apparatus R is performed by performing any one of notification of device abnormality, operation stop of the device, and oil return operation to the compressor 1. It is possible to prevent problems such as seizure in the machine 1.

[Other variations]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.
For example, in the above-described embodiment, a moving image is picked up by a CCD camera that constitutes an image pickup unit, and the moving image is converted into a still image. It can also be used to determine the liquid level.

  In the above-described embodiment, a CCD camera is used as the imaging unit. However, as an imaging unit capable of imaging the liquid level in an accumulator or the like, a digital camera such as a CMOS camera can be used in addition to the CCD camera. Can be used.

In the above-described embodiment, a CCD camera as an imaging unit is arranged in front of the liquid level gauge. However, as long as the liquid level of the liquid refrigerant in the accumulator can be imaged via the liquid level gauge. The position of the CCD camera can be changed as appropriate.
In the above-described embodiment, the liquid level state of the liquid refrigerant in the accumulator of the refrigeration apparatus is determined. However, the determination apparatus of the present invention also determines the liquid level state of the refrigeration oil in the compressor that constitutes the refrigeration apparatus. It can also be determined.

Moreover, in the apparatus according to the above-described embodiment, the liquid level state in the equipment configuring the refrigeration apparatus is determined. However, the present invention is also applicable to an apparatus that determines the liquid state in the apparatus configuring the refrigeration apparatus. Can do.
That is, a liquid state determination apparatus according to another embodiment of the present invention is an apparatus that determines a liquid state in a device that constitutes a refrigeration apparatus and contains liquid therein,
A confirmation unit for confirming the liquid state in the device;
An imaging unit for imaging the liquid state confirmed by the confirmation unit;
A recognition unit that recognizes a liquid state image captured by the imaging unit, and a calculation unit that includes a determination unit that classifies the image recognized by the recognition unit into one of a plurality of preset classifications.
As an example of a liquid state, the dirt of the refrigerant | coolant in the apparatus which comprises a freezing apparatus can be mentioned, for example. Such contamination of the refrigerant can be detected or detected by classifying the refrigerant into any one of a plurality of classifications by the imaging unit and the calculation unit.

DESCRIPTION OF SYMBOLS 1: Compressor 2: Accumulator 2a: Wall surface 3: Oil separator 4: Four-way switching valve 5: Outdoor heat exchanger 6: Outdoor fan 7: Expansion valve 9: Gas pipe 10: Liquid pipe 20: Liquid level gauge 20a : Upper liquid level gauge 20b: Medium liquid level gauge 20c: Lower liquid level gauge 21: Short cylindrical body 22: Saddle part 23: Window body 24: Fixing part 25: Bolt 26: Nut 27a: Image 27b: Image 27c: Image 28 : Image 30: CCD camera 40: Control unit 41: Reception unit 42: Calculation unit 43: Storage unit 44: Transmission unit 45: Recognition unit 46: Discrimination unit 50: Display unit D: Refrigeration device R: Discrimination device

Claims (12)

An apparatus for determining a liquid surface state in a device that constitutes a refrigeration apparatus (R) and contains liquid therein,
A confirmation unit (20) for confirming the liquid level in the device;
An imaging unit (30) for imaging the liquid level confirmed by the confirmation unit (20);
The recognition unit (45) for recognizing the liquid level image captured by the imaging unit (30), and the image recognized by the recognition unit (45) are classified into any of a plurality of preset three or more classifications. A liquid level state discriminating device (D) comprising a calculating unit (42) including a discriminating unit (46). An apparatus for determining a liquid surface state in a device that constitutes a refrigeration apparatus (R) and contains liquid therein,
A confirmation unit (20) for confirming the liquid level in the device;
An imaging unit (30) for imaging the liquid level confirmed by the confirmation unit (20);
A recognition unit (45) that recognizes the liquid level image captured by the imaging unit (30), and a determination unit that classifies the image recognized by the recognition unit (45) into one of a plurality of preset categories. 46) including a calculation unit (42),
The apparatus for determining includes a plurality of confirmation units (20) and a plurality of imaging units (30) corresponding to the number of the confirmation units (20).
The said calculating part (42) is a liquid level state determination apparatus (D) which makes the said recognition part (45) recognize the several image obtained as one image. A learning image storage unit (43) that stores learning image information that is information about the liquid level image;
The plurality of classifications are created by the learning image information,
The liquid level state discriminating device (D) according to claim 1 or 2, wherein the learning image information is information learned by using deep learning.   The liquid level state discriminating apparatus (D) according to any one of claims 1 to 3, further comprising a display unit (50) for displaying a discrimination result of the liquid level image by the discrimination unit (46) in time series. ).   Imaging for imaging the liquid level confirmed by a computer and a confirmation unit (20) for confirming the liquid level in the device in order to determine the liquid level state in the device constituting the refrigeration apparatus (R) and containing the liquid inside A recognition unit (45) for recognizing a liquid level image captured by the unit (30), and a determination unit for classifying the image recognized by the recognition unit (45) into any of a plurality of preset three or more classifications (46) A liquid level state determination program that functions as (46). Imaging for imaging the liquid level confirmed by a computer and a confirmation unit (20) for confirming the liquid level in the device in order to determine the liquid level state in the device constituting the refrigeration apparatus (R) and containing the liquid inside A recognition unit (45) for recognizing the liquid level image captured by the unit (30), and a determination unit (46) for classifying the image recognized by the recognition unit (45) into any of a plurality of preset categories. The apparatus for determining the liquid level in the device includes a plurality of confirmation units (20) and a plurality of imaging units (30) corresponding to the number of the confirmation units (20). The calculation unit (42) including the unit (45) and the determination unit (46) is a liquid level state determination program that causes the recognition unit (45) to recognize a plurality of obtained images as one image.   A refrigerating apparatus (R) comprising the liquid level state discriminating apparatus (D) according to any one of claims 1 to 4, a compressor (1), and an accumulator (2).   The refrigeration apparatus (R) according to claim 7, wherein protection control of the refrigeration apparatus (R) is performed when a determination result by the determination unit (46) of the liquid level state determination apparatus (D) is within a predetermined warning range. ).   The refrigeration apparatus (R) according to claim 8, wherein the warning range is below a predetermined liquid level for the compressor (1) and above a predetermined liquid level for the accumulator (2).   The refrigeration apparatus (R) according to claim 8 or 9, wherein the protection control is any one of notification of device abnormality, stop of operation of the device, and operation of returning oil to the compressor (1). An apparatus for determining a liquid state in a device that constitutes a refrigeration apparatus (R) and contains liquid therein,
A confirmation unit (20) for confirming the liquid state in the device;
An imaging unit (30) for imaging the liquid state confirmed by the confirmation unit (20);
The recognition unit (45) for recognizing the liquid state image captured by the imaging unit (30), and the image recognized by the recognition unit (45) are classified into any of a plurality of preset three or more classifications. A liquid state discriminating device (D) comprising an arithmetic unit (42) including a discriminating unit (46). An apparatus for determining a liquid state in a device that constitutes a refrigeration apparatus (R) and contains liquid therein,
A confirmation unit (20) for confirming the liquid state in the device;
An imaging unit (30) for imaging the liquid state confirmed by the confirmation unit (20);
A recognition unit (45) that recognizes the liquid state image captured by the imaging unit (30), and a determination unit that classifies the image recognized by the recognition unit (45) into one of a plurality of preset categories. 46) including a calculation unit (42),
The apparatus for determining includes a plurality of confirmation units (20) and a plurality of imaging units (30) corresponding to the number of the confirmation units (20).
The said calculating part (42) is a liquid state determination apparatus (D) which makes the said recognition part (45) recognize the some image obtained as one image.

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