Device and method for measuring solubility and viscosity of lubricating oil in compressor

Abstract

The invention relates to a device and a method for measuring solubility and viscosity of lubricating oil in a compressor, the device comprises an ultrasonic generating device and an ultrasonic receiving device, and a mixture formed by mixing a refrigerant and the lubricating oil according to a certain proportion is stored at the bottom of the inner side of a compressor shell; the ultrasonic generating device and the ultrasonic receiving device are connected with the signal processing device through cables, the signal processing device activates the ultrasonic generating device to emit ultrasonic waves by sending out signals, and the ultrasonic waves are received by the ultrasonic receiving device and converted into receiving signals after passing through the mixture. According to the time difference between the sent signal and the received signal and the ultrasonic propagation distance, calculating to obtain the sound velocity of ultrasonic propagation in the mixture; and calculating the solubility and the viscosity of the mixture according to the sound velocity of the ultrasonic wave propagating in the mixture based on the sound velocity corresponding to different solubility and the sound velocity corresponding to different viscosity of the lubricating oil and the refrigerant of the same variety calibrated in advance. According to the invention, the measurement convenience is improved, and the measurement stability can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of compressors, and in particular relates to a device and a method for measuring the solubility and viscosity of lubricating oil in a compressor. Background Art

[0002] The refrigerant in the refrigeration compressor will dissolve into the lubricating oil under high pressure. The physical properties of the lubricating oil dissolved with the refrigerant will change greatly. At this time, the state of the lubricating oil is crucial to the normal operation of the compressor. For example, under conditions such as low exhaust superheat and high load, the solubility of the lubricating oil is too high and the viscosity is too low, which can easily cause the compressor bearing to wear and cause the compressor to fail. Therefore, real-time monitoring of the solubility and viscosity of the compressor lubricating oil is an important condition for compressor research and development and actual operation control optimization of the refrigeration system.

[0003] In the prior art, the viscosity of lubricating oil can be measured by reciprocating or rotating motion of a micro-piston probe, or the solubility of lubricating oil can be obtained by light absorption rate, refractive index, and dielectric constant. However, the price of micro-piston probe sensors is relatively high, often ranging from tens of thousands to hundreds of thousands of yuan, and the refractive index probe requires a transparent medium, and the dielectric constant probe needs to be inserted deep into the compressor oil pool. In addition, the above methods all require the compressor housing to be modified. Therefore, the existing methods are often used for laboratory research or single compressor testing, and are difficult to be widely used in batch testing of actual products. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the prior art and provide a device and method for measuring the solubility and viscosity of lubricating oil in a compressor, which can efficiently measure the state of the lubricating oil in the compressor instantaneously, has low device cost, and can be used in large quantities.

[0005] In order to achieve the above object, the present invention has the following technical solutions: In a first aspect, a device for measuring the solubility and viscosity of lubricating oil in a compressor is provided, comprising an ultrasonic generating device and an ultrasonic receiving device. A mixture of refrigerant and lubricating oil in a certain proportion is stored at the bottom of the inner side of the compressor shell. The ultrasonic generating device and the ultrasonic receiving device are connected to a signal processing device through a cable. The signal processing device activates the ultrasonic generating device to emit ultrasonic waves by sending a signal. After the ultrasonic waves pass through the mixture, they are received by the ultrasonic receiving device and converted into receiving signals. The sound velocity of the ultrasonic waves propagating in the mixture is calculated according to the time difference between the sent signal and the received signal and combined with the ultrasonic propagation distance. The solubility and viscosity of the mixture are calculated based on the pre-calibrated sound velocities corresponding to different solubilities and the sound velocities corresponding to different viscosities of the same type of lubricating oil and refrigerant, and according to the sound velocity of the ultrasonic waves propagating in the mixture.

[0006] As a preferred solution, the ultrasonic generating device and the ultrasonic receiving device are respectively installed on the outside of the compressor housing. The crankshaft of the compressor rotates when the compressor is running, and the mixture is pumped to the part requiring lubrication through an oil pump, and the bottom of the crankshaft is used as an ultrasonic reflection device; the ultrasonic generating device, the ultrasonic receiving device, the signal processing device and the bottom of the crankshaft together constitute an ultrasonic measuring device.

[0007] As a preferred solution, the ultrasonic generating device and the ultrasonic receiving device form an integrated ultrasonic generating and receiving device, which extends into the compressor housing and is installed inside the mixture; a metal sheet is fixed to the upper part of the integrated ultrasonic generating and receiving device as an ultrasonic reflecting device, and the integrated ultrasonic generating and receiving device, the signal processing device and the ultrasonic reflecting device together constitute an ultrasonic measuring device.

[0008] As a preferred solution, a temperature and pressure probe is inserted into the compressor housing to measure the internal temperature and pressure of the mixture to correct the measurement result.

[0009] As a preferred solution, the ultrasonic generating device and the ultrasonic receiving device adopt piezoelectric ceramic ultrasonic sensors or MEMS sensors.

[0010] In a second aspect, a method for measuring the solubility and viscosity of lubricating oil in a compressor is provided, comprising: An ultrasonic generating device and an ultrasonic receiving device are installed on the outside of the compressor housing, and the surfaces of existing parts inside the compressor housing are used as ultrasonic reflecting devices; the ultrasonic generating device and the ultrasonic receiving device are connected to the signal processing device through a cable; Record the thickness of the compressor shell where the ultrasonic generating device is located , the distance between the surface of the ultrasonic generating device and the ultrasonic reflecting device , the thickness of the compressor shell at the location of the ultrasonic receiving device And the distance between the surface of the ultrasonic receiving device and the ultrasonic reflecting device , and obtain the speed of ultrasonic wave propagation in the compressor housing according to the material of the compressor housing ; The signal processing device activates the ultrasonic generating device to emit ultrasonic waves by sending signals, and the ultrasonic waves penetrate the thickness of the compressor shell. After the distance, the mixture is passed The distance is reflected by the ultrasonic reflection device and continues to propagate After the distance is reached, the ultrasonic wave is received by the ultrasonic receiving device and converted into a receiving signal; The signal processing device records the time when the signal is sent. and the time of receiving the signal , calculate the speed of sound propagating in the mixture; Based on the pre-calibrated sound velocities corresponding to different solubilities and viscosities of the same type of lubricant and refrigerant, the solubility and viscosity of the mixture are calculated according to the sound velocity of the ultrasonic wave propagating in the mixture.

[0011] Furthermore, the step of calculating the speed of sound of the ultrasonic wave propagating in the mixture is calculated by the following expression: .

[0012] As a preferred solution, when the surface of the existing parts inside the compressor housing is used as the ultrasonic reflection device, the bottom surface of the crankshaft or the surface of the bearing seat is selected as the ultrasonic reflection device.

[0013] In a third aspect, another method for measuring the solubility and viscosity of lubricating oil in a compressor is provided, comprising: An ultrasonic generating and receiving integrated device consisting of an ultrasonic generating device and an ultrasonic receiving device is extended into a compressor housing and installed inside the mixture; a metal sheet is fixed on the upper part of the ultrasonic generating and receiving integrated device as an ultrasonic reflecting device; and the ultrasonic generating and receiving integrated device is connected to a signal processing device through a cable; Record the distance between the integrated ultrasonic generating and receiving device and the ultrasonic reflecting device, that is, the distance between the surface of the ultrasonic generating device and the ultrasonic reflecting device Equal to the distance between the surface of the ultrasonic receiving device and the ultrasonic reflecting device ; The signal processing device activates the ultrasonic generating device to emit ultrasonic waves by sending out signals, and the ultrasonic waves are transmitted in the mixture. After reaching the ultrasonic reflection device, it is reflected by the ultrasonic reflection device and continues to transmit. After reaching the distance, the ultrasonic wave is received by the ultrasonic generating and receiving integrated device and converted into a receiving signal; The signal processing device records the time when the signal is sent. and the time of receiving the signal , calculate the speed of sound propagating in the mixture; Based on the pre-calibrated sound velocities corresponding to different solubilities and viscosities of the same type of lubricant and refrigerant, the solubility and viscosity of the mixture are calculated according to the sound velocity of the ultrasonic wave propagating in the mixture.

[0014] Furthermore, the step of calculating the speed of sound of the ultrasonic wave propagating in the mixture is calculated by the following expression: .

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: The measuring device of lubricating oil solubility and viscosity in the compressor of the present invention does not need to modify the compressor housing when in use, and uses an ultrasonic generator and an ultrasonic receiver to measure the acoustic properties of the refrigerant and lubricating oil mixture stored at the bottom of the inner side of the compressor housing, thereby improving the convenience of measurement and ensuring the stability of measurement. The signal processing device activates the ultrasonic generator to emit ultrasonic waves by sending a signal, and the ultrasonic waves are received by the ultrasonic receiver after passing through the mixture and converted into received signals. The sound velocity of the ultrasonic wave propagating in the mixture is calculated according to the time difference between the sent signal and the received signal and combined with the ultrasonic propagation distance, based on the sound velocity corresponding to different solubilities of the same type of lubricating oil and refrigerant and the sound velocity corresponding to different viscosities of the pre-calibrated lubricating oil and refrigerant, and the solubility and viscosity corresponding to the mixture are calculated according to the sound velocity of the ultrasonic wave propagating in the mixture. The device has a simple structure, and there is no need to use expensive micro-piston probe sensors, refractive index probes, and dielectric constant probes, so that the device cost is greatly reduced, which is conducive to large-scale use. In addition, the measuring device of the present invention can use high-frequency ultrasonic waves, which have the characteristics of high acquisition frequency, good dynamic characteristics, and high precision, which is conducive to the transient and efficient measurement of the state of the compressor lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 Schematic diagram of a first embodiment of a device for measuring the solubility and viscosity of lubricating oil in a compressor according to the present invention; Figure 2 It is a schematic diagram of sending and receiving signals by a signal processing device according to an embodiment of the present invention; Figure 3 Schematic diagram of the corresponding sound velocities of the same type of lubricating oil and refrigerant at different solubilities pre-calibrated in an embodiment of the present invention; Figure 4 It is a schematic diagram of the corresponding sound velocities of the same type of lubricating oil and refrigerant at different viscosities in advance according to an embodiment of the present invention; Figure 5 Schematic diagram of a second embodiment of a device for measuring the solubility and viscosity of lubricating oil in a compressor according to the present invention; In the accompanying drawings: 1-compressor housing, 2-mixture, 3-crankshaft, 4-oil pump, 5-ultrasonic generating device, 6-ultrasonic receiving device, 7-signal processing device, 8-ultrasonic generating and receiving integrated device, 9-metal sheet. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] The embodiment of the present invention proposes a device for measuring the solubility and viscosity of lubricating oil in a compressor, comprising an ultrasonic generating device 5 and an ultrasonic receiving device 6. A mixture 2 formed by mixing refrigerant and lubricating oil in a certain proportion is stored at the bottom of the inner side of the compressor housing 1. The ultrasonic generating device 5 and the ultrasonic receiving device 6 are connected to a signal processing device 7 through a cable. The signal processing device 7 activates the ultrasonic generating device 5 to emit ultrasonic waves by sending a signal. After the ultrasonic waves pass through the mixture 2, they are received by the ultrasonic receiving device 6 and converted into receiving signals. The sound velocity of the ultrasonic wave propagating in the mixture 2 is calculated according to the time difference between the sending signal and the receiving signal and combined with the ultrasonic wave propagation distance; based on the pre-calibrated sound velocities corresponding to different solubilities and the sound velocities corresponding to different viscosities of the same type of lubricating oil and refrigerant, the solubility and viscosity of the mixture 2 are calculated according to the sound velocity of the ultrasonic wave propagating in the mixture 2.

[0020] like Figure 1 As shown, the ultrasonic generating device 5 and the ultrasonic receiving device 6 of the first embodiment of the present invention are respectively installed on the outside of the compressor housing 1. The crankshaft 3 of the compressor rotates when the compressor is running, and the mixture 2 is pumped to the part requiring lubrication through the oil pump 4, and the bottom of the crankshaft 3 is used as an ultrasonic reflection device; the ultrasonic generating device 5, the ultrasonic receiving device 6, the signal processing device 7 and the bottom of the crankshaft 3 together constitute an ultrasonic measuring device.

[0021] like Figure 5 As shown, the second embodiment of the present invention is composed of an ultrasonic generating device 5 and an ultrasonic receiving device 6 to form an ultrasonic generating and receiving integrated device 8, the ultrasonic generating and receiving integrated device 8 extends into the compressor housing 1, and is installed inside the mixture 2; a metal sheet 9 is fixed on the upper part of the ultrasonic generating and receiving integrated device 8 as an ultrasonic reflecting device, and the ultrasonic generating and receiving integrated device 8, the signal processing device 7 and the ultrasonic reflecting device together constitute an ultrasonic measuring device.

[0022] In a possible implementation, according to Example 2 of the present invention, if the integrated ultrasonic generating and receiving device 8 is extended into the compressor housing 1 and installed inside the mixture 2, a temperature and pressure probe can also be extended into the compressor housing 1 to measure the internal temperature and pressure of the mixture 2 to correct the measurement results and improve the accuracy.

[0023] In a possible implementation, the ultrasonic generating device 5 and the ultrasonic receiving device 6 are to realize converting electrical signals into ultrasonic signals and converting ultrasonic signals into electrical signals, and they may be piezoelectric ceramic ultrasonic sensors or MEMS sensors.

[0024] See also Figure 1 The embodiment of the present invention further provides a method for measuring the solubility and viscosity of lubricating oil in a compressor, comprising: An ultrasonic generating device 5 and an ultrasonic receiving device 6 are installed on the outside of the compressor housing 1, and the surfaces of existing parts inside the compressor housing 1 are used as ultrasonic reflection devices; the ultrasonic generating device 5 and the ultrasonic receiving device 6 are connected to the signal processing device 7 through a cable; Record the thickness of the compressor housing 1 at the location of the ultrasonic generating device 5 , the distance between the surface of the ultrasonic generating device 5 and the ultrasonic reflecting device , the thickness of the compressor housing 1 at the location of the ultrasonic receiving device 6 and the distance between the surface of the ultrasonic receiving device 6 and the ultrasonic reflecting device , and obtain the speed of ultrasonic wave propagation in the compressor housing 1 according to the material of the compressor housing 1 ; The signal processing device 7 sends Figure 2 The signal shown activates the ultrasonic generating device 5 to emit ultrasonic waves, which penetrate the thickness of the compressor shell 1. After the distance, pass in mixture 2 The distance is reflected by the ultrasonic reflection device and continues to propagate After reaching the distance, the ultrasonic wave is received by the ultrasonic receiving device 6 and converted into a receiving signal; The signal processing device 7 records the time when the signal is sent. and the time of receiving the signal , by processing the time difference between the two signals, the sound velocity of the ultrasonic wave propagating in the mixture 2 is calculated; the calculation expression is as follows:

[0025] See also Figure 3 and Figure 4 Based on the pre-calibrated sound velocities corresponding to different solubilities and viscosities of the same type of lubricant and refrigerant, the solubility and viscosity of the mixture 2 can be inversely calculated according to the sound velocity of the ultrasonic wave propagating in the mixture 2.

[0026] In a possible implementation, when the surface of existing parts inside the compressor housing 1 is used as the ultrasonic reflection device, the bottom surface of the crankshaft 3 or the surface of the bearing seat is selected as the ultrasonic reflection device.

[0027] See also Figure 5 The embodiment of the present invention also provides another method for measuring the solubility and viscosity of lubricating oil in a compressor, comprising: An ultrasonic generating and receiving integrated device 8 composed of an ultrasonic generating device 5 and an ultrasonic receiving device 6 is extended into the compressor housing 1 and installed inside the mixture 2; a metal sheet 9 is fixed on the upper part of the ultrasonic generating and receiving integrated device 8 as an ultrasonic reflecting device; and the ultrasonic generating and receiving integrated device 8 is connected to the signal processing device 7 through a cable; Record the distance between the integrated ultrasonic generating and receiving device 8 and the ultrasonic reflecting device, that is, the distance between the surface of the ultrasonic generating device 5 and the ultrasonic reflecting device Equal to the distance between the surface of the ultrasonic receiving device 6 and the ultrasonic reflecting device ; The signal processing device 7 sends Figure 2 The signal shown activates the ultrasonic generating device 5 to emit ultrasonic waves, which are transmitted in the mixture 2. After reaching the ultrasonic reflection device, it is reflected by the ultrasonic reflection device and continues to transmit. After reaching the distance, the ultrasonic wave is received by the ultrasonic generating and receiving integrated device 8 and converted into a receiving signal; The signal processing device 7 records the time when the signal is sent. and the time of receiving the signal , by processing the time difference between the two signals, the sound velocity of the ultrasonic wave propagating in the mixture 2 is calculated; the calculation expression is as follows:

[0028] See also Figure 3 and Figure 4 Based on the pre-calibrated sound velocities corresponding to different solubilities and viscosities of the same type of lubricant and refrigerant, the solubility and viscosity of the mixture 2 can be inversely calculated according to the sound velocity of the ultrasonic wave propagating in the mixture 2.

[0029] In a possible implementation, if the integrated ultrasonic generating and receiving device 8 is inserted into the compressor housing 1 and installed inside the mixture 2, a temperature and pressure probe may also be inserted into the compressor housing 1 to measure the internal temperature and pressure of the mixture 2 to correct the measurement results and improve the accuracy.

[0030] The present invention relies on ultrasonic emission and ultrasonic receiving devices to measure the acoustic properties of the mixture, and has the advantages of high stability and no excessive modification to the compressor, thereby improving the convenience of measurement. The ultrasonic generating device and ultrasonic receiving device of the present invention are piezoelectric ceramic ultrasonic sensors or MEMS ultrasonic sensors, and the materials are readily available and the structure is simple, which greatly reduces the cost of the device and is conducive to large-scale use. The measuring device for the solubility and viscosity of the lubricating oil in the compressor of the present invention can use high-frequency ultrasonic waves, and has the characteristics of high acquisition frequency, good dynamic characteristics, and high precision, which is conducive to the transient and efficient measurement of the state of the lubricating oil in the compressor.

[0031] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0032] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0033] Multiple embodiments of the present disclosure are described in detail above, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection required by the present disclosure.

Claims

1. A device for measuring the solubility and viscosity of lubricating oil in a compressor, characterized in that: The invention comprises an ultrasonic generating device (5) and an ultrasonic receiving device (6). A mixture (2) formed by mixing refrigerant and lubricating oil in a certain proportion is stored at the bottom of the inner side of the compressor housing (1). The ultrasonic generating device (5) and the ultrasonic receiving device (6) are connected to a signal processing device (7) via a cable. The signal processing device (7) activates the ultrasonic generating device (5) to emit ultrasonic waves by sending a signal. After the ultrasonic waves pass through the mixture (2), they are received by the ultrasonic receiving device (6) and converted into receiving signals. The sound velocity of the ultrasonic waves propagating in the mixture (2) is calculated based on the time difference between the sending signal and the receiving signal and the ultrasonic wave propagation distance. The solubility and viscosity of the mixture (2) are calculated based on the sound velocities corresponding to different solubilities and the sound velocities corresponding to different viscosities of the same type of lubricating oil and refrigerant that are pre-calibrated, and the sound velocity of the ultrasonic waves propagating in the mixture (2) is calculated.

2. The device for measuring the solubility and viscosity of lubricating oil in a compressor according to claim 1, characterized in that: The ultrasonic generating device (5) and the ultrasonic receiving device (6) are respectively installed on the outside of the compressor housing (1); the crankshaft (3) of the compressor rotates when the compressor is running, and the mixture (2) is pumped to the part requiring lubrication through the oil pump (4), and the bottom of the crankshaft (3) is used as an ultrasonic reflection device; the ultrasonic generating device (5), the ultrasonic receiving device (6), the signal processing device (7) and the bottom of the crankshaft (3) together constitute an ultrasonic measuring device.

3. The device for measuring the solubility and viscosity of lubricating oil in a compressor according to claim 1, characterized in that: The ultrasonic generating device (5) and the ultrasonic receiving device (6) form an integrated ultrasonic generating and receiving device (8), which extends into the compressor housing (1) and is installed inside the mixture (2). A metal sheet (9) is fixed to the upper part of the integrated ultrasonic generating and receiving device (8) as an ultrasonic reflection device. The integrated ultrasonic generating and receiving device (8), the signal processing device (7) and the ultrasonic reflection device together form an ultrasonic measuring device.

4. The device for measuring the solubility and viscosity of lubricating oil in a compressor according to claim 3, characterized in that: A temperature and pressure probe is inserted into the compressor housing (1) to measure the internal temperature and pressure of the mixture (2) to correct the measurement result.

5. The device for measuring the solubility and viscosity of lubricating oil in a compressor according to claim 1, characterized in that: The ultrasonic generating device (5) and the ultrasonic receiving device (6) adopt piezoelectric ceramic ultrasonic sensors or MEMS sensors.

6. A method for measuring the solubility and viscosity of lubricating oil in a compressor, characterized in that: include: An ultrasonic generating device (5) and an ultrasonic receiving device (6) are installed on the outside of the compressor housing (1), and the surfaces of existing parts inside the compressor housing (1) are used as ultrasonic reflection devices; the ultrasonic generating device (5) and the ultrasonic receiving device (6) are connected to a signal processing device (7) via a cable; Record the thickness of the compressor housing (1) at the location of the ultrasonic generating device (5) , the distance between the surface of the ultrasonic generating device (5) and the ultrasonic reflecting device , the thickness of the compressor casing (1) at the location of the ultrasonic receiving device (6) and the distance between the surface of the ultrasonic receiving device (6) and the ultrasonic reflecting device , and the speed at which the ultrasonic wave propagates in the compressor housing (1) is obtained according to the material of the compressor housing (1) ; The signal processing device (7) activates the ultrasonic generating device (5) to emit ultrasonic waves by sending a signal, and the ultrasonic waves penetrate the thickness of the compressor shell (1). After the distance, in the mixture (2) The distance is reflected by the ultrasonic reflection device and continues to propagate After reaching the distance, the ultrasonic wave is received by the ultrasonic receiving device (6) and converted into a receiving signal; The signal processing device (7) records the time when the signal is sent. and the time of receiving the signal , calculate the speed of sound propagating in the mixture (2); Based on the pre-calibrated sound velocities corresponding to different solubilities and the sound velocities corresponding to different viscosities of the same type of lubricant and refrigerant, the solubility and viscosity of the mixture (2) are calculated according to the sound velocity of the ultrasonic wave propagating in the mixture (2).

7. The method for measuring the solubility and viscosity of lubricating oil in a compressor according to claim 6, characterized in that: The step of calculating the sound velocity of the ultrasonic wave propagating in the mixture (2) is calculated by the following expression: 。 8. The method for measuring the solubility and viscosity of lubricating oil in a compressor according to claim 6, characterized in that: When the surface of existing parts inside the compressor housing (1) is used as the ultrasonic reflection device, the bottom surface of the crankshaft (3) or the surface of the bearing seat is selected as the ultrasonic reflection device.

9. A method for measuring the solubility and viscosity of lubricating oil in a compressor, characterized in that: include: An ultrasonic generating and receiving integrated device (8) composed of an ultrasonic generating device (5) and an ultrasonic receiving device (6) is extended into a compressor housing (1) and installed inside the mixture (2); a metal sheet (9) is fixed on the upper part of the ultrasonic generating and receiving integrated device (8) as an ultrasonic reflecting device; and the ultrasonic generating and receiving integrated device (8) is connected to a signal processing device (7) via a cable; Record the distance between the integrated ultrasonic generating and receiving device (8) and the ultrasonic reflecting device, that is, the distance between the surface of the ultrasonic generating device (5) and the ultrasonic reflecting device Equal to the distance between the surface of the ultrasonic receiving device (6) and the ultrasonic reflecting device ; The signal processing device (7) activates the ultrasonic generating device (5) to emit ultrasonic waves by sending a signal, and the ultrasonic waves are transmitted in the mixture (2). After reaching the ultrasonic reflection device, it is reflected by the ultrasonic reflection device and continues to transmit. After reaching the distance, the ultrasonic wave is received by the ultrasonic generating and receiving integrated device (8) and converted into a receiving signal; The signal processing device (7) records the time when the signal is sent. and the time of receiving the signal , calculate the speed of sound propagating in the mixture (2); Based on the pre-calibrated sound velocities corresponding to different solubilities and the sound velocities corresponding to different viscosities of the same type of lubricant and refrigerant, the solubility and viscosity of the mixture (2) are calculated according to the sound velocity of the ultrasonic wave propagating in the mixture (2).

10. The method for measuring the solubility and viscosity of lubricating oil in a compressor according to claim 9, characterized in that: The step of calculating the sound velocity of the ultrasonic wave propagating in the mixture (2) is calculated by the following expression: 。

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