WO2016113903A1

WO2016113903A1 - Compressor

Info

Publication number: WO2016113903A1
Application number: PCT/JP2015/051073
Authority: WO
Inventors: 森田　慎也
Original assignee: 三菱電機株式会社
Priority date: 2015-01-16
Filing date: 2015-01-16
Publication date: 2016-07-21
Also published as: EP3246571B1; JP6305569B2; EP3246571A4; EP3246571A1; JPWO2016113903A1

Abstract

Provided is a compressor (100) with an outer contour constituted by an airtight container (100A), said compressor comprising: a suction pipe (1) that is connected to a side face portion of the airtight container (100A) and that passes a refrigerant flowing in the suction side of the compressor (100); a liquid level sensor (10) that detects a liquid level in the airtight container (100A); a heating means (30) provided within the airtight container (100A); and a control means for driving the heating means (30) when the liquid level obtained by the liquid level sensor (10) is equal to or greater than a reference level.

Description

Compressor

The present invention relates to a compressor.

Conventionally, a first temperature detection element and a second temperature detection element are provided, and the oil level inside the hermetic container of the compressor is detected based on the detection values of the first temperature detection element and the second temperature detection element. There was an oil level sensor (see, for example, Patent Document 1).

Conventionally, there has been a compressor that drives the heating means based on the detection value of the temperature detection element. In such a compressor, when the detection value of the temperature detection element satisfies a predetermined condition, the heating means is driven to vaporize the liquid refrigerant stored in the sealed container.

JP 2006-47133 A

However, since the invention described in Patent Document 1 is intended to detect the oil level, it cannot directly detect the state of the liquid refrigerant stored in the sealed container. In such a case, although liquid refrigerant is actually stored in the sealed container, it is erroneously detected that the liquid refrigerant is not stored in the sealed container, and liquid compression is possible. There was a problem that there was sex.

The present invention has been made against the background of the above-described problems, and an object of the present invention is to obtain a compressor that suppresses liquid compression more than before.

The compressor according to the present invention is a compressor whose outer shell is constituted by a sealed container, and is connected to a side surface portion of the sealed container and passes a refrigerant flowing through the suction side of the compressor, and the sealed container A liquid level sensor for detecting the liquid level in the inside, a heating means provided inside the sealed container, and driving the heating means when the liquid level obtained by the liquid level sensor is equal to or higher than a reference level. And a control means.

According to the present invention, the control means for driving the heating means when the liquid level obtained by the liquid level sensor is equal to or higher than the reference level is provided. For this reason, it can suppress that a liquid refrigerant is compressed in the inside of an airtight container. Therefore, liquid compression can be suppressed more than before.

It is a figure which shows the outline of the compressor 100 which concerns on Embodiment 1 of this invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a figure which shows the control action of the compressor 100 which concerns on Embodiment 1 of this invention. It is a figure which shows the control action of the compressor 100 which concerns on Embodiment 2 of this invention. It is a figure which shows the control action of the compressor 100 which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. In the following drawings, the size relationship of each component may be different from the actual one. In the following drawings, the same reference numerals denote the same or corresponding parts, and this is common throughout the entire specification. Furthermore, the forms of the constituent elements shown in the entire specification are merely examples, and are not limited to these descriptions.

FIG. 1 is a diagram showing an outline of a compressor 100 according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. In the present invention, an example in which the compressor 100 is a scroll compressor will be described.

As shown in FIG. 1, the compressor 100 includes a suction pipe 1, a compression mechanism unit 2, an oil draining unit 4, a liquid level sensor 10, a temperature sensor 20, and a heating unit 30. The outer shell of the compressor 100 is composed of a sealed container 100A. Refrigerating machine oil (hereinafter sometimes simply referred to as oil) is stored below the sealed container 100A.

As shown in FIG. 1, the suction pipe 1 is a pipe provided at the upper part of the side surface of the sealed container 100A. The inside of the suction pipe 1 communicates with the inside of the sealed container 100A. A refrigerant flowing on the suction side of the compressor 100 is supplied to the suction pipe 1. The compression mechanism 2 is a part that compresses the refrigerant supplied into the sealed container 100 </ b> A through the suction pipe 1. As shown in FIG. 2, the compression mechanism 2 is provided with a suction port 2a. The refrigerant flowing inside the sealed container 100A is supplied to the compression mechanism unit 2 through the suction port 2a. An oil sump 3 is provided at the bottom of the sealed container 100A. Oil is stored in the oil reservoir 3.

The oil draining means 4 is a member for discharging the oil stored in the oil reservoir 3 to the outside of the sealed container 100A, and is provided, for example, at the lower part of the side surface of the sealed container 100A. The oil draining means 4 is composed of, for example, a hollow cylindrical member. For example, a valve (not shown) that can be freely opened and closed is provided inside the oil draining means 4. By adjusting the oil draining means 4, the amount of oil flowing inside the oil draining means 4 can be adjusted. When the oil draining means 4 is opened, the oil stored in the lower part of the sealed container 100A is discharged to the outside of the sealed container 100A through the oil draining means 4. When the oil draining means 4 is closed, the oil stored in the lower part of the sealed container 100A continues to be stored in the sealed container 100A without passing through the oil draining means 4.

The liquid level sensor 10 is a detecting means for detecting the liquid level of the liquid refrigerant stored in the sealed container 100A, and is provided at a height position of the suction pipe 1, for example. The liquid level sensor 10 is provided, for example, below the upper end 1A of the suction pipe 1 and above the lower end 1B of the suction pipe 1. The liquid level sensor 10 is attached near the suction port 2a, for example. The temperature sensor 20 is a temperature detection means provided in the lower part in the sealed container 100A. The temperature sensor 20 detects the temperature of the lower part of the sealed container 100A.

The heating means 30 is a heating means for heating the liquid refrigerant stored in the sealed container 100A, and is provided, for example, in the lower part of the sealed container 100A. By driving the heating unit 30, the liquid refrigerant stored in the sealed container 100A is heated and vaporized, and the liquid level of the liquid refrigerant stored in the sealed container 100A is lowered.

The control means (not shown) drives the heating means 30 when the liquid level obtained by the liquid level sensor 10 is equal to or higher than the reference level. Specifically, for example, the control means drives the heating means 30 when the liquid level in the sealed container 100A is equal to or higher than the height of the suction pipe 1. A control means is provided in the machine room formed in the inside of an outdoor unit, for example. The control means controls the opening and closing of the oil draining means 4. The control means may be capable of controlling the oil draining means 4 only in the two states of “open” and “closed”, and the ratio of opening the oil draining means 4 is changed in a plurality of stages. You may be able to do that. The control means is configured by, for example, hardware such as a circuit device that realizes this function, or software executed on an arithmetic device such as a microcomputer or a CPU.

FIG. 3 is a diagram showing a control operation of the compressor 100 according to Embodiment 1 of the present invention. In the first embodiment, it is assumed that the liquid refrigerant stagnates because the compressor 100 has been stopped for a long period of time, and before the compressor 100 is activated (when the compressor 100 is activated and controlled). ) The liquid level in the sealed container 100A of the compressor 100 is measured. Below, the operation | movement before starting of the compressor 100 which concerns on this Embodiment 1 is demonstrated using FIG.

In step S21, when it is determined that the liquid level obtained by the liquid level sensor 10 is equal to or higher than the reference level (YES in step S21), the control unit moves to step S32 and drives the heating unit 30. Alternatively, the liquid discharge operation is performed, and the process proceeds to step S21.
In step S21, when it is determined that the liquid level obtained by the liquid level sensor 10 is not equal to or higher than the reference level (NO in step S21), the control unit proceeds to step S22 and starts the compressor 100.

As described above, the compressor 100 according to the first embodiment is the compressor 100 whose outer shell is configured by the sealed container 100A, and is connected to the side surface portion of the sealed container 100A so that the suction side of the compressor 100 is connected. The suction pipe 1 through which the flowing refrigerant passes, the liquid level sensor 10 for detecting the liquid level in the sealed container 100A, the heating means 30 provided in the sealed container 100A, and the liquid before the compressor 100 is activated. And a control means for driving the heating means 30 when the liquid level obtained by the surface sensor 10 is equal to or higher than the reference level. For this reason, after starting the compressor 100, only a gas refrigerant is taken in the compression mechanism part 2, and liquid compression can be suppressed rather than before. Therefore, it is possible to prevent the compressor 100 from being damaged due to liquid compression activation (sleeping activation) of the liquid refrigerant that has fallen.

Further, by providing the liquid level sensor 10 at the height position of the suction pipe 1, the possibility that the liquid refrigerant stored in the sealed container 100A flows to the suction side of the compressor 100 through the suction pipe 1 is further suppressed. can do. Therefore, it is possible to prevent the compressor 100 from being damaged due to liquid compression activation (sleeping activation) of the liquid refrigerant that has fallen.

Further, since the liquid level of the liquid refrigerant inside the sealed container 100A can be directly detected using the liquid level sensor 10, the detected value of the temperature detecting means provided at the lower part in the sealed container 100A is used as in the conventional case. Accordingly, it is not necessary to indirectly detect the liquid level of the liquid refrigerant inside the sealed container 100A. Accordingly, the startup time of the compressor 100 can be shortened by grasping the liquid level inside the sealed container 100A in real time.

Embodiment 2. FIG.
In the second embodiment, unlike the first embodiment, the control means controls the compressor 100 during the operation of the compressor 100. In the second embodiment, items that are not particularly described are the same as those in the second embodiment, and the same functions and configurations are described using the same reference numerals.

FIG. 4 is a diagram showing a control operation of the compressor 100 according to Embodiment 2 of the present invention. In the second embodiment, when the compressor 100 is operated, the control unit drives and controls the heating unit 30 so as not to compress the liquid. Hereinafter, the operation of the compressor 100 according to the second embodiment will be described with reference to FIG.

In step S11, the control means performs start control of the compressor 100, and proceeds to step S21. In step S21, the control means determines whether or not the liquid level obtained by the liquid level sensor 10 is equal to or higher than a reference level.

In step S21, when it is determined that the liquid level obtained by the liquid level sensor 10 is equal to or higher than the reference level (YES in step S21), the control unit proceeds to step S31.
In step S21, when the control means determines that the liquid level obtained by the liquid level sensor 10 is not equal to or higher than the reference level (NO in step S21), the control means moves to step S23, and the control means moves to the compressor 100. Continue driving.

In step S31, the control means stops the compressor 100 and proceeds to step S32. In step S32, the control means drives the heating means 30 or performs a liquid discharge operation, and proceeds to step S41. In step S41, the control means starts the compressor 100 and proceeds to step S21. In addition, you may make it abbreviate | omit the process of step S31 and step S41.

As described above, in the compressor 100 according to the second embodiment, after the compressor 100 is started, the control unit is configured when the liquid level obtained by the liquid level sensor 10 is equal to or higher than the reference level. The heating means 30 is driven. For this reason, only the gas refrigerant is taken into the compression mechanism section 2 and liquid compression can be suppressed as compared with the conventional case. Therefore, it is possible to prevent the compressor 100 from being damaged due to the liquid compression operation.

Embodiment 3 FIG.
In the third embodiment, unlike the first embodiment, the control means controls the compressor 100 during the operation of the compressor 100. In Embodiment 3, items that are not particularly described are the same as those in Embodiment 1, and the same functions and configurations are described using the same reference numerals.

FIG. 5 is a diagram showing a control operation of the compressor 100 according to Embodiment 3 of the present invention. In the third embodiment, when the compressor 100 is operating, the control means controls the oil discharge means 4 so as not to compress oil. Hereinafter, the operation of the compressor 100 according to the third embodiment will be described with reference to FIG.

In step S31, the control means stops the compressor 100 and proceeds to step S32. In step S32, the control means drives the heating means 30 or performs a liquid discharge operation for a predetermined time, and proceeds to step S33. In step S33, the control means determines whether or not the liquid level obtained by the liquid level sensor 10 is equal to or higher than a reference level.

In step S33, when it is determined that the liquid level obtained by the liquid level sensor 10 is equal to or higher than the reference level (YES in step S33), the control unit proceeds to step S34.
In step S33, when the control means determines that the liquid level obtained by the liquid level sensor 10 is not equal to or higher than the reference level (NO in step S33), the control means moves to step S23, and the control means moves to the compressor 100. Continue driving.

In step S34, the control means controls the oil draining means 4 to perform the oil draining operation, and the process proceeds to step S41. Here, the oil draining operation is, for example, an operation in which the oil stored in the oil reservoir 3 is discharged to the outside of the sealed container 100A through the oil draining means 4. In step S41, the control means starts the compressor 100 and proceeds to step S21. In addition, you may make it abbreviate | omit the process of step S31 and step S41.

In step S34, the control unit may continuously control the driving of the heating unit 30 during the oil draining operation, or may control the driving of the heating unit 30 during the oil draining operation. You may stop.

As described above, in the compressor 100 according to the third embodiment, the control unit drives the heating unit 30 when the liquid level obtained by the liquid level sensor 10 is equal to or higher than the reference level, and the heating unit 30 , The oil draining means 4 is controlled so that the oil is discharged to the outside of the sealed container 100A when the liquid level obtained by the liquid level sensor 10 is equal to or higher than the reference level.
For this reason, during operation of the compressor 100, even when the liquid level inside the closed container 100 </ b> A is high due to a large amount of oil, the oil is discharged and the liquid level is below the height of the suction pipe 1. It can be. Therefore, it can suppress that oil is introduce | transduced into the compression mechanism part 2. FIG. In this way, it is possible to suppress the performance of the compressor 100 from being reduced by compressing the oil and the operating range of the compressor 100 from being reduced.

Although an example in which only one liquid level sensor 10 is provided has been described, the present invention is not limited to this, and a plurality of liquid level sensors 10 may be provided. By providing a plurality of liquid level sensors 10 in this manner, the liquid level inside the sealed container 100A can be detected more accurately than in the case where one liquid level sensor 10 is provided.

Further, as the liquid level sensor 10, for example, a capacitance type sensor and a float type sensor can be adopted. When a capacitance type sensor is employed as the liquid level sensor 10, the liquid level inside the sealed container 100A can be detected even under a harsh environment such as a high pressure inside the sealed container 100A. . When a float type sensor is employed as the liquid level sensor 10, the liquid level inside the sealed container 100A can be detected with a simple structure and at low cost.

Further, although an example in which the reference level used in step S21 and the reference level used in step S33 are the same has been described, the present invention is not limited to this. For example, the reference level used in step S33 may be set lower than the reference level used in step S21. In this way, even when the oil reaches the height position of the suction pipe 1, even when the liquid level inside the sealed container 100A is somewhat lowered by driving the heating means 30 in step S32, In step S33, it is determined that the control means is excessive in oil, and the oil stored in the sealed container 100A can be discharged.

When the reference level used in step S33 is set lower than the reference level used in step S21, the reference level used in step S33 is determined as follows, for example. The control means stores the degree of decrease in the liquid level inside the sealed container 100A with respect to the time when the heating means 30 is driven when the liquid refrigerant is accumulated inside the sealed container 100A. In step S33, the control means stores the liquid level lowering level with respect to the time when the heating means 30 is driven, stored in the control means, and the liquid level inside the sealed container 100A with respect to the time when the heating means 30 is driven. If the level is lower than the degree of decrease, the process proceeds to step S34.

1 suction pipe, 1A upper end, 1B lower end, 2 compression mechanism, 2a suction port, 3 oil sump, 4 oil draining means, 10 liquid level sensor, 20 temperature sensor, 30 heating means, 100 compressor, 100A sealed container.

Claims

A compressor whose outer shell is formed of a sealed container,
A suction pipe connected to a side surface portion of the sealed container and passing a refrigerant flowing on a suction side of the compressor;
A liquid level sensor for detecting a liquid level in the sealed container;
Heating means provided inside the sealed container;
And a control unit that drives the heating unit when the liquid level obtained by the liquid level sensor is equal to or higher than a reference level.
The control means includes
The compressor according to claim 1, wherein the heating unit is driven when the liquid level obtained by the liquid level sensor is equal to or higher than the reference level before the compressor is started.
The control means includes
The compressor according to claim 1, wherein after the compressor is started, the heating means is driven when the liquid level obtained by the liquid level sensor is equal to or higher than the reference level.
Oil draining means for discharging the oil stored in the sealed container to the outside of the sealed container,
The control means includes
After the compressor is started, when the liquid level obtained by the liquid level sensor is equal to or higher than the reference level, the heating unit is driven, and after the heating unit is driven, the liquid level sensor 2. The compressor according to claim 1, wherein the oil draining unit is controlled to discharge the oil to the outside of the hermetic container when the liquid level obtained by the step is equal to or higher than the reference level.
The reference level is
The compressor according to any one of claims 1 to 4, wherein the compressor is not less than a lower end portion of the suction pipe and not more than an upper end portion of the suction pipe.
A compression mechanism for compressing the refrigerant sucked from the suction pipe;
The compression mechanism is
A suction port through which the refrigerant sucked from the suction pipe is introduced;
The compressor according to any one of claims 1 to 5, wherein the liquid level sensor is provided in a suction port of the compression mechanism section.