WO2017130321A1

WO2017130321A1 - Compressor

Info

Publication number: WO2017130321A1
Application number: PCT/JP2016/052315
Authority: WO
Inventors: 佐藤　幸一; 茗ヶ原　将史
Original assignee: 三菱電機株式会社
Priority date: 2016-01-27
Filing date: 2016-01-27
Publication date: 2017-08-03
Also published as: KR20180086460A; JPWO2017130321A1; CN108474369A; KR102044315B1

Abstract

To provide a compressor capable of detecting capacitance and measuring the quantity of a refrigerator oil with a low cost and simple configuration. A compressor of the present invention is provided with: an airtight container; a compressing mechanism unit that compresses a refrigerant gas in the airtight container; one connecting terminal, which is provided to penetrate the airtight container from the inside to the outside, and which is electrically insulated from the airtight container; and one electrode, which is electrically and mechanically connected to the connecting terminal in the airtight container, and which is disposed by having an electrode surface face the inner surface of the airtight container, said one electrode generating capacitance between the electrode surface and the inner surface of the airtight container.

Description

Compressor

The present invention relates to a compressor that is used in a refrigeration cycle of a refrigerating and air-conditioning apparatus such as an air conditioner or a freezer and compresses refrigerant gas.

Generally, a compressor that compresses refrigerant gas is used in a refrigeration cycle of a refrigeration air conditioner such as an air conditioner or a freezer. In order to operate the compressor, it is necessary to supply sufficient refrigerating machine oil to the compression mechanism that compresses the refrigerant to ensure a good lubrication state. If sufficient compressor oil is not supplied to the compression mechanism section, the compressor cannot completely seal the gaps with respect to the respective sections and bearings of the compression mechanism section, and refrigerant gas leaks out of the compression chamber, causing refrigeration. This causes a decrease in the refrigerating capacity of the air conditioner. In addition, if sufficient refrigeration oil is not supplied to the bearings constituting the compression mechanism section, the compressor cannot secure fluid lubrication, and the shaft and the bearings may be in fixed contact, and may become inoperable due to abnormal wear and seizure. .

Compressor needs to secure a sufficient amount of refrigerating machine oil stored in a closed container in order to supply sufficient refrigerating machine oil to the compression mechanism. However, when the compressor is incorporated in a refrigeration circuit, for example, when starting or operating at a high flow rate, the refrigeration oil is taken out of the sealed container by the refrigerant gas. For this reason, the compressor may not be able to supply sufficient refrigerating machine oil to the compression mechanism unit and the bearing due to a shortage of oil.

In order to solve the above problems, for example, the compressor disclosed in Patent Document 1 below has a configuration in which a pair of terminals and a pair of electrodes are installed in the normal direction of the inner surface of the sealed container. In this compressor, the concentration of the refrigerating machine oil in the sealed container is measured by detecting the capacitance between the pair of electrodes, the operation of the refrigerant circuit is controlled based on the measured value, and the refrigerating machine oil is contained in the compressor. The operation is such that the operation returns.

JP 2002-317785 A

The compressor disclosed in Patent Document 1 has a configuration in which a pair of electrodes is provided in a hermetic container. Therefore, there is a problem that the number of parts increases, the structure becomes complicated, and the manufacturing cost increases.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a compressor capable of measuring the amount of refrigeration oil by detecting the capacitance with an inexpensive and simple configuration. To do.

The compressor according to the present invention is provided with a sealed container, a compression mechanism for compressing a refrigerant gas in the sealed container, and an interior and exterior of the sealed container that are electrically insulated from the sealed container. A connection terminal is electrically and mechanically connected to the connection terminal in the sealed container, and is installed with an electrode surface facing the inner surface of the sealed container. The electrode surface and the inner surface of the sealed container And an electrode for generating a capacitance between them.

The compressor of the present invention has a simple configuration with one connection terminal and one electrode, and can detect the capacitance and measure the amount of refrigeration oil. Costs can be reduced and the economic effect is excellent.

It is a longitudinal section of the compressor concerning an embodiment of the invention. It is the A section enlarged view instruct | indicated in FIG.

Embodiments Hereinafter, the configuration and operation of a compressor according to the present invention will be described based on the illustrated embodiments. FIG. 1 is a longitudinal sectional view of a compressor according to an embodiment of the present invention. FIG. 2 is an enlarged view of part A indicated in FIG.

The compressor 100 of the present embodiment shown in FIG. 1 shows a rotary compressor as an example. The compressor 100 includes a refrigerant circuit that sequentially connects the compressor 100, a four-way valve, an indoor heat exchanger, an expansion valve, an outdoor heat exchanger, an accumulator 12, and the like through piping, and circulates the enclosed refrigerant. It is used for a refrigeration cycle of a refrigeration air conditioner such as an air conditioner or a freezer.

In the compressor 100, an electric motor 2 including a stator 2a and a rotor 2b and a compression mechanism unit 3 driven by the electric motor 2 are housed in a sealed container 1 in a high-pressure atmosphere. A refrigerating machine oil 15 that mainly lubricates sliding of the compression mechanism 3 is stored at the bottom of the sealed container 1. In the compressor 100, a suction connection pipe 10 communicating with an accumulator 12 is connected to a compression mechanism unit 3 in the hermetic container 1, and low-pressure and high-temperature gas refrigerant is taken into the compression chamber of the compression mechanism unit 3 from the accumulator 12. . The compressor 100 has a discharge pipe 11 connected to the upper part of the hermetic container 1, and a gas refrigerant compressed to a high pressure and a high temperature is discharged from the discharge pipe 11.

The electric motor 2 includes a stator 2a fixed in the hermetic container 1, and a rotor 2b that is rotatably attached to the stator 2a and is driven to rotate by energizing the stator 2a. Power is supplied from the outside through an airtight terminal to drive. A crankshaft 4 is shrink fitted on the rotor 2b, and a compression mechanism 3 is connected via the crankshaft 4. That is, the rotational force of the electric motor 2 is transmitted to the compression mechanism unit 3 via the crankshaft 4.

The crankshaft 4 is formed between a main shaft 4a fixed to the rotor 2b of the electric motor 2, a sub shaft 4b provided on the opposite side of the main shaft 4a across the compression mechanism portion 3, and the main shaft 4a and the sub shaft 4b. And the eccentric portion 4c. Although not shown in detail, the crankshaft 4 has an oil supply hole that opens in the bottom direction of the hermetic container 1, and a helical centrifugal pump is provided in the oil supply hole so as to be sealed. The refrigerating machine oil 15 stored at the bottom of the container 1 is pumped up and supplied to the compression mechanism unit 3.

The main shaft 4a of the crankshaft 4 is provided with a main bearing 5 that rotatably supports the main shaft 4a, and is fitted with a clearance for sliding. The auxiliary shaft 4b of the crankshaft 4 is provided with an auxiliary bearing 6 that rotatably supports the auxiliary shaft 4b, and is fitted with a clearance for sliding.

The compression mechanism unit 3 includes a cylinder 7 that forms a compression chamber, and a piston 8 that is rotatably fitted to the eccentric portion 4c of the crankshaft 4 in the compression chamber. It is stored in.

The cylinder 7 has a cylindrical inner space as a compression chamber, and a piston 8 that is rotatably fitted to the eccentric portion 4c of the crankshaft 4 is disposed in the inner space. The outer peripheral surface is fixed to. The cylinder 7 is provided with a vane (not shown) that partitions the compression chamber into a suction chamber and a discharge chamber, and gas refrigerant is sucked into the suction chamber from the accumulator 12 through the suction connecting pipe 10.

As shown in FIG. 2 in an enlarged manner, the hermetic container 1 is provided with a mounting plate 16 in a high pressure region in which the refrigerating machine oil 15 is stored. A single connection terminal 13 that is electrically insulated from the sealed container 1 is provided on the mounting plate 16 so as to penetrate the outside and the inside of the sealed container 1. One electrode 14 is electrically and mechanically connected to the connection terminal 13 at the inner end of the sealed container 1.

The electrode 14 has a flat plate shape and has an electrode surface facing the inner surface of the sealed container 1, and generates a capacitance between the electrode surface and the inner surface of the sealed container 1. In the case of the illustrated example, the electrode 14 shows a state in which the electrode surface is parallel to the inner surface of the sealed container 1, but the electrode surface may be opposed to the inner surface of the sealed container 1, and is not necessarily parallel. It is not limited to the state of letting it go. Moreover, the shape of the electrode 14 is not limited to a flat plate shape, and may be, for example, a rod shape, and is implemented in various shapes depending on the implementation status.

Since the conventional compressor has a configuration in which a pair of electrodes are installed in the normal direction of the sealed container, if the electrodes are made large in order to ensure the sensitivity of capacitance detection, the amount of the electrodes protruding toward the inside of the container increases. Become. Therefore, there is a possibility that the electrode may interfere with the compression element or the motor element, and there is a restriction on the expansion of the electrode. When enlarging the electrodes, the container of the compressor is enlarged to provide a space so that the electrodes do not interfere with the compression element or the motor element, or a dedicated space protruding toward the outside of the container is provided. There is a need for.

On the other hand, in the compressor 100 of the present embodiment, since the electrode 14 is installed with the electrode surface facing the inner surface of the hermetic container 1, the configuration of the compression element and the like can be achieved even when the large electrode 14 is used. There is no possibility of interference with the member. Therefore, without increasing the size of the container of the compressor 100 or providing a dedicated space, the sensitivity of detecting the capacitance of the electrode 14 is increased, and the measurement accuracy of the oil level of the refrigerator oil 15 is increased. Safety and reliability can be improved.

An oil amount measuring device 17 is provided outside the sealed container 1 for detecting the electrostatic capacity connected to the sealed container 1 and the connection terminal 13 and measuring the oil level height of the refrigerating machine oil 15 based on the detected value. It has been. In addition, a controller 9 that controls the operation of the compressor 100 based on the measured value measured by the oil amount measuring device 17 is provided outside the sealed container 1.

Next, the operation of the compressor 100 will be described. In the compressor 100, the eccentric part 4c of the crankshaft 4 rotates eccentrically with the main shaft 4a, and the piston 8 fitted to the eccentric part 4c makes the outer peripheral surface of the piston 8 contact the inner peripheral surface of the compression chamber. Revolve. As the piston 8 revolves in the compression chamber, vanes are provided on both side surfaces and are held by bushes (not shown) to move forward and backward. Then, the compressor 100 sucks the low-pressure refrigerant from the suction connection pipe 10 into the suction chamber, compresses the refrigerant to a predetermined pressure in the discharge chamber, changes the valve of the discharge pipe 11 to the open state, and increases the pressure from the discharge hole. The gas refrigerant is discharged and sent to the refrigeration cycle of the refrigeration air conditioner.

The compressor 100 of the present embodiment has a shortage of oil level due to the fact that the refrigerating machine oil 15 is taken out of the sealed container 1 by the refrigerant gas at the time of start-up or high-flow operation, for example. When sufficient refrigeration oil 15 cannot be supplied to the bearing, the oil amount measuring device 17 can detect the capacitance that changes due to the absence of the refrigeration oil 15 between the sealed container 1 and the electrode 14. The compressor 100 performs control to stop the operation of the compressor 100 based on the measured value of the oil level height of the refrigerating machine oil 15 measured based on the detected value, so that an accident that damages the compressor 100 is performed. Can be prevented in advance. Alternatively, the amount of the refrigerating machine oil 15 in the hermetic container can be recovered by controlling the operating state of the refrigerating circuit so that the refrigerating machine oil 15 easily returns to the compressor 100.

Therefore, the compressor 100 according to the present embodiment can maintain high efficiency that does not cause a decrease in the refrigeration capacity of the refrigeration air conditioner due to refrigerant gas leakage, and reliability that does not cause abnormal wear and seizure of the bearing. . In addition, since the compressor 100 has a simple configuration with one connection terminal 13 and one electrode 14, the material cost and processing cost required for manufacturing compared to a conventional refrigeration apparatus configured with a pair of electrodes can be reduced. It can be suppressed and has excellent economic effects.

As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the structure of embodiment mentioned above. For example, in this embodiment, the rotary compressor has been described as an example. However, the present invention is not limited to this, and can be applied to any type of compression mechanism such as a scroll compressor, a reciprocating compressor, or the like. Modifications can be made as appropriate within the scope of the technology of the present invention. In short, it should be noted that the scope of the present invention also includes the scope of various changes, applications, and uses made by those skilled in the art as needed.

1 sealed container, 2 motor, 2a stator, 2b rotor, 3 compression mechanism, 4 crankshaft, 4a main shaft, 4b subshaft, 4c eccentric portion, 5 main bearing, 6 subbearing, 7 cylinder, 8 piston, 9 control unit, 10 suction connection pipe, 11 discharge pipe, 12 accumulator, 13 connection terminal, 14 electrodes, 15 refrigerating machine oil, 16 mounting plate, 17 oil quantity measuring device, 100 compressor.

Claims

A sealed container;
A compression mechanism for compressing the refrigerant gas in the sealed container;
One connection terminal provided through the inside and outside of the sealed container, and electrically insulated from the sealed container;
It is electrically and mechanically connected to the connection terminal in the sealed container, and is installed with the electrode surface facing the inner surface of the sealed container, between the electrode surface and the inner surface of the sealed container. And a single electrode for generating a capacitance.
An oil amount measuring means for detecting the capacitance and measuring the oil amount of the refrigerating machine oil in the sealed container based on the detected value;
The compressor according to claim 1, further comprising a control unit that controls the compression mechanism unit based on a measurement value of the oil amount measurement unit.
The compressor according to claim 1 or 2, wherein the electrode has a flat plate shape or a rod shape.