KR101376615B1 - Hermetic Compressor - Google Patents

Hermetic Compressor Download PDF

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Publication number
KR101376615B1
KR101376615B1 KR1020070139287A KR20070139287A KR101376615B1 KR 101376615 B1 KR101376615 B1 KR 101376615B1 KR 1020070139287 A KR1020070139287 A KR 1020070139287A KR 20070139287 A KR20070139287 A KR 20070139287A KR 101376615 B1 KR101376615 B1 KR 101376615B1
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KR
South Korea
Prior art keywords
oil
thermal reaction
sealed container
compressor
unit
Prior art date
Application number
KR1020070139287A
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Korean (ko)
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KR20090071085A (en
Inventor
박효근
조남규
장기태
신동구
Original Assignee
엘지전자 주식회사
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Priority to KR1020070139287A priority Critical patent/KR101376615B1/en
Publication of KR20090071085A publication Critical patent/KR20090071085A/en
Application granted granted Critical
Publication of KR101376615B1 publication Critical patent/KR101376615B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/24—Level of liquid, e.g. lubricant or cooling liquid

Abstract

The present invention relates to a hermetic compressor. The hermetic compressor according to the present invention has a predetermined height difference inside the compressor casing, and installs a thermal reaction sensor and applies an electric current to the thermal reaction sensor to detect the oil level of the oil stored in the compressor casing. If the oil level decreases below a certain height through real-time monitoring, it determines that the oil is insufficient and controls the operation of the compressor. Therefore, the compressor may prevent the bearing surface from abrasion or increase in noise due to the oil shortage. Can be.

Compressor, oil, oil level, thermal sensor, voltage difference

Description

{HERMETIC COMPRESSOR}

The present invention relates to an oil level measurement apparatus in a hermetic compressor.

In general, a compressor obtains a high pressure gas by applying mechanical energy to the gas to increase the mechanical energy of the gas and then converting the pressure into pressure, and is mainly used in home appliances having a refrigeration cycle such as a refrigerator or an air conditioner.

The compressor is mainly known as an electric compressor for generating a driving force in the inner space of the hermetic casing and a hermetic compressor for compressing the gas by receiving the driving force of the electric mechanism. The hermetic compressor may be classified into a reciprocating type, a rotary type, a scroll type, and a vane type according to a gas compression method.

The casing of the hermetic compressor is filled with a certain amount of oil to lubricate or cool the power mechanism and the compressor mechanism, and part of this oil is adjusted to maintain a constant amount by circulating a refrigeration cycle by the compressor mechanism. . However, some of the oil spilled into the refrigeration cycle may not be recovered due to various factors, and as a result, the hermetic compressor may be damaged while operating in a bad condition, so that an appropriate amount of oil may be maintained in the casing at all times. Should.

However, in the conventional hermetic compressor, a visualization window is installed at one side of the casing to visually detect the amount of oil inside the casing through the visualization window, but this checks the amount of oil inside the casing in real time. In addition to the difficulty of the following, there is a problem that the strength of the visualization window is weak and may be dangerous when the compressor is operated.

The present invention solves the problems of the conventional hermetic compressor as described above, it is possible to automatically check the oil level of the oil filled in the inner space of the casing in real time, the hermetic type that can control the operation of the compressor according to the residual amount of the oil It is an object of the present invention to provide a compressor.

In order to achieve the object of the present invention, a sealed container filled with a predetermined amount of oil; A compression unit installed inside the sealed container to compress the refrigerant; An oil pumping unit for pumping oil in the closed container to supply the compression unit; And an oil amount detecting unit fastened to the wall surface of the sealed container and detecting an oil level of the oil filled in the sealed container.

In addition, a sealed container filled with a predetermined amount of oil; A compression unit installed inside the sealed container to compress the refrigerant; An oil pumping unit for pumping oil in the closed container to supply the compression unit; And an oil amount detection unit coupled to the wall surface of the sealed container and detecting an oil level of the oil filled in the sealed container, wherein the oil amount detecting unit has thermal reaction sensors disposed on the upper and lower sides of the sealed container, respectively. In addition, there is provided a hermetic compressor for sensing the oil level by using a voltage difference between when the oil is submerged and when the oil is not submerged by the plurality of thermal reaction sensors.

In the hermetic compressor according to the present invention, an oil level stored in the compressor casing is provided through a voltage difference generated by installing a thermal reaction sensor with a predetermined height difference inside the casing and applying a current to the thermal reaction sensor. Is monitored in real time, and if the oil level decreases below a certain height, it determines that the oil is insufficient and controls the operation of the compressor. Therefore, the compressor prevents the bearing surface from being worn out or the noise increases due to the oil shortage. can do.

Hereinafter, a hermetic compressor according to the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

As shown in FIG. 1, the scroll compressor of the present invention includes a casing 10, which is a sealed container in which a sealed space is formed, and an electric mechanism part 20 installed inside the casing 10 to generate a driving force. And a compression mechanism part 30 coupled to the electric mechanism part 20 to compress the refrigerant in the inner space of the casing 10, and installed in the casing 10 and remaining in the inner space of the casing 10. It includes an oil amount detection unit 40 for measuring the oil level of the oil.

The casing 10 has an inner space 11 filled with a refrigerant having a discharge pressure, and an upper side of the casing 10 is connected to a suction pipe 12 directly connected to the compression mechanism 30. The lower side of the 12 is connected to the discharge tube 13 is in communication with the inner space 11 of the casing (10).

The motor mechanism 20 includes a stator 21 fixed to an inner circumferential surface of the casing 10, a rotor 22 rotatably disposed inside the stator 21, and the rotor 22. It is composed of a drive shaft 23 coupled to the center to transmit the rotational force to the compression mechanism (30). The oil passage 23a penetrates the drive shaft 23 in the axial direction, and an oil pump 24 is installed at the lower end of the oil passage 23a to pump oil of the casing 10.

The compression mechanism 30 is provided with a fixed wrap 31a of the involute shape is installed on the main frame 14 and the fixed scroll 31 is connected directly to the suction pipe, and the fixed wrap (31) of the fixed scroll ( An involute swing wrap 32a is provided to engage with 31a) to form a compression chamber P. The swing scroll 32 is mounted on the main frame 16, and the main frame 16 and the swing scroll 32 Interposed between the 32 is made of an old dam ring 33 to prevent the rotation of the swing scroll (32).

2 and 3, the oil amount detecting unit 40 is coupled to the inner space 11 of the casing 10 and is installed with a predetermined height difference H1 at both upper and lower sides. The reaction sensor 41 and the second thermal reaction sensor 42 and the first thermal reaction sensor 41 and the second thermal reaction sensor 42 are respectively installed on one side of the respective thermal reaction sensor 41, 42 The first resistance 43 and the second resistance 44, the resistance value of which varies according to the temperature of the, between the first thermal reaction sensor 41 and the first resistance 43 and the second thermal reaction sensor A voltage difference detecting unit 45 connected between the 42 and the second resistors 44 to detect a difference between voltages transmitted by the first and second thermal reaction sensors 41 and 42, respectively; The control unit (shown in FIG. 1) 46 controls the compressor operation by determining the oil level OH based on the detection value detected by the voltage difference detecting unit 45. Here, the first thermal reaction sensor 41 is installed with a predetermined height difference H2 at a position lower than at least the lower end coil 21a of the power mechanism unit 20 in terms of reliability of the power mechanism unit 20. It may be desirable. The second thermal reaction sensor 42 is preferably installed at a position having a predetermined height difference H3 not lower than at least the suction port 24 of the oil pump 24 for the stable supply of oil.

The first thermal reaction sensor 41 is formed of a thermistor, and is horizontally penetrated through the through-hole 10a provided in the side wall surface of the casing 10 and fastened to the side wall surface of the casing 10. . For example, a through hole 10a is formed in the side wall surface of the casing 10 so that the first thermal reaction sensor 41 is inserted, and the first thermal reaction sensor 41 is formed in the inner circumferential surface of the through hole 10a. A female screw portion 10b is formed to fasten the male screw portion 41a of the male screw portion 41a, and an outer surface or an inner surface of the through hole 10a has a predetermined height to reinforce the fastening strength of the first thermal reaction sensor 41. Fastening protrusions 10c may be formed. And the female screw portion (10b) and the male screw portion (48b) can increase the fastening strength that the diameter is enlarged as the fastening depth deepens.

A sealing member 47 such as an o-ring may be interposed between the front end surface of the fastening protrusion 10c and the first thermal reaction sensor 41 to prevent leakage of the refrigerant or oil. have.

The first thermal reaction sensor 41 is divided into a body portion 48 and a sensor portion 49, as shown in Figs. 4 and 5, the screw head for screwing the outer side of the outer peripheral surface of the body portion 48 A 48a is formed, and a male screw portion 48b which is screwed to the female portion 10a of the casing 10 is formed inside the outer circumferential surface of the body portion 48. The sensor unit 49 is inserted into the casing 10 to respond to a temperature change, and a heat reaction unit 49a, a cover unit 49b to accommodate the heat reaction unit 49a, and the cover. It is formed in the portion 49b and consists of an oil drainage portion 49c for discharging the oil remaining inside the cover portion 49b to the outside. The draining portion 49c may be formed in a slit shape split in the longitudinal direction near the lowest point of the cover portion 49b or formed as a hole.

Since the second thermal reaction sensor 42 is formed and assembled in the same manner as the first thermal reaction sensor 41, a detailed description thereof will be omitted.

On the other hand, the first thermal reaction sensor 41 and the second thermal reaction sensor 42 may be provided as the lower toward the center from the inner wall surface of the casing 10 as shown in Figure 6, in this case the cover No oil remains in the part, so drainage may be unnecessary.

In the figure, reference numeral 15 denotes a subframe.

The scroll compressor of the present invention operates as follows.

That is, when power is applied to the electric drive unit 20 and the drive shaft 23 rotates, the turning scroll 32 coupled to the drive shaft is moved from the upper surface of the main frame 16 by the old dam ring 33. A crescent shaped compression chamber P is formed between the fixed wrap 31a and the turning wrap 32a while making a pivoting movement by an eccentric distance. As the volume moves gradually toward the center, the volume gradually decreases, and the refrigerant is continuously compressed and discharged into the inner space 11 of the casing 10.

Here, the oil pump 24 provided at the lower end of the drive shaft 23 is to pump the oil filled in the lower half of the casing 10, the oil through the oil flow path (23a) of the drive shaft (23) While being sucked up and scattered, some are recovered and some are mixed with the refrigerant and flowed out through the discharge tube 13 into the refrigeration cycle. The spilled oil is circulated through the refrigerating cycle and recovered through the suction pipe 12 to the inner space of the casing 10.

At this time, the oil amount detecting unit 40 detects in real time the oil level of the oil remaining in the inner space of the casing 10 and checks whether to maintain the proper amount of oil, if the inner space of the casing 10 ( If the oil remaining in 11) is less than or equal to the reference value, the transmission mechanism unit 20 is stopped to prevent damage to the compression mechanism unit 30 and the like.

Looking at the oil amount detection process as described above in more detail as shown in FIG.

That is, when the first thermal reaction sensor 41 is in contact with the discharge pressure refrigerant of the casing 10 without being immersed in oil, while the second thermal reaction sensor 42 is immersed in oil, the first thermal reaction sensor is The temperature of the 41 and the second thermal reaction sensor 42 is different from each other as the temperature of the refrigerant and the temperature of the oil are different. That is, the temperature of the first thermal reaction sensor 41 is relatively higher than the temperature of the second thermal reaction sensor 42, and the resistance value of the first resistor 43 is the resistance value of the second resistor 44. Will be lowered. This is because the thermistor of the present invention is made of a metal oxide-conjugated sintered material, and is made of a negative temperature coefficient (NTC) thermistor having a property that the resistance value is greatly reduced at higher temperatures.

Accordingly, when a current is applied to the oil amount detection unit 40, the thermal difference sensors 41 each of the voltage difference detection units 45 according to the difference between the resistance values of the first resistor 43 and the second resistor 44. The voltage difference is detected by 42.

First, when the voltage difference detected by the voltage difference detecting unit 45 is in a certain range, the controller 46 determines that oil is discharged to the lower side than the second thermal reaction sensor 42 to stop the operation of the compressor. Or in the case of a plurality of compressors to communicate with the other compressor and the uniform pipe (not shown) to allow the oil to flow. On the other hand, if the voltage difference falls outside the predetermined range, the controller 46 determines that the oil is kept higher than the second thermal reaction sensor 42 and continues the operation of the compressor.

In this way, when the oil level of the oil stored in the compressor casing is monitored in real time and the oil level of the oil decreases below a certain height, it is determined that the oil is insufficient to control the operation of the compressor. Wear or increased noise can be prevented.

The oil level detecting apparatus of the present invention can be similarly applied to rotary compressors, reciprocating compressors, and the like in addition to the scroll compressor as in the above-described embodiment.

1 is a longitudinal sectional view showing an example of the scroll compressor of the present invention;

Figure 2 is a longitudinal sectional view showing an installation state of the oil amount detection unit in the scroll compressor according to FIG.

3 is a circuit diagram showing the configuration of the oil amount detection unit according to FIG.

4 is a perspective view showing a thermal reaction sensor of the oil amount detection unit according to FIG.

5 is a cross-sectional view taken along line "I-I" of FIG. 4;

Figure 6 is a longitudinal sectional view showing another embodiment of the installation state of the oil amount detection unit in the scroll compressor according to FIG.

DESCRIPTION OF REFERENCE NUMERALS

10 casing 10a through hole

10b: female thread 10c: fastening protrusion

20: power mechanism 21a: end coil

30: compressor section 31: fixed scroll

32: turning scroll 40: oil level detection unit

41,42: First and second thermal sensor 43,44: First and second resistance

45: voltage difference detection unit 46: control unit

47: sealing member 48: body

48a: screw head 48b: male thread part

49 sensor unit 49a thermal reaction unit

49b: cover part 49c: oil drainage part

OH: oil level

Claims (15)

A sealed container filled with a predetermined amount of oil; A compression unit installed inside the sealed container to compress the refrigerant; An oil pumping unit for pumping oil in the closed container to supply the compression unit; And And an oil amount detecting unit fastened to a wall surface of the sealed container and detecting an oil level of oil filled in the sealed container, wherein the oil amount detecting unit includes: A plurality of thermal reaction sensors that are penetrated through the inner space of the sealed container and installed at a predetermined height difference on both upper and lower sides; A plurality of resistors respectively installed at one side of the plurality of thermal reaction sensors; And The controller is connected between each of the thermal reaction sensor and the resistance, respectively, and detects the voltage difference between each thermal reaction sensor and the resistance to determine the oil level of the sealed container, and controls the operation of the compressor; A thermal reaction part inserted into the sealed container and reacting to a temperature; A cover part accommodating the thermal reaction part; And And a drainage part formed on the cover part to discharge oil remaining in the cover part to the outside. The method of claim 1, A through hole is formed in the wall surface of the sealed container so as to insert the oil amount detecting unit, and a threaded portion is formed in the inner circumferential surface of the through hole, while a threaded portion is formed in the outer circumferential surface of the oil amount detecting unit to be fastened to the threaded portion of the sealed container. Hermetic compressor. 3. The method of claim 2, A hermetic compressor having fastening protrusions formed around the through-hole of the hermetic container. The method of claim 1, And a sealing member interposed between the hermetically sealed container and the oil level detecting unit. delete delete The method of claim 1, The oil discharge part is a hermetic compressor formed in the shape of a slit split in the longitudinal direction of the cover portion or a hole. The method of claim 1, The oil amount detection unit is a hermetic compressor installed horizontally. The method of claim 1, The oil amount detection unit is a hermetic compressor installed lower toward the center from the inner wall surface of the hermetic container. delete delete delete The method according to any one of claims 1 to 4 and 7 to 9, The oil amount detecting unit is a hermetic compressor installed not lower than the lowest point of the suction port of the oil pumping unit. delete delete
KR1020070139287A 2007-12-27 2007-12-27 Hermetic Compressor KR101376615B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070139287A KR101376615B1 (en) 2007-12-27 2007-12-27 Hermetic Compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070139287A KR101376615B1 (en) 2007-12-27 2007-12-27 Hermetic Compressor

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KR20090071085A KR20090071085A (en) 2009-07-01
KR101376615B1 true KR101376615B1 (en) 2014-03-20

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101452767B1 (en) 2010-04-01 2014-10-21 엘지전자 주식회사 Oil level detecting means for compressor
IN2013MN01826A (en) 2011-04-18 2015-06-12 Emerson Climate Tech Suzhou Co
CN102748295B (en) * 2011-04-18 2014-12-03 艾默生环境优化技术(苏州)有限公司 Rotary compressor and rotary machine
KR101635553B1 (en) * 2014-10-30 2016-07-01 엘지전자 주식회사 Compressor and Oil self-diagnosis method of the same
FR3133650B1 (en) * 2022-03-21 2024-03-01 Pfeiffer Vacuum Vacuum pump

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001012351A (en) 1999-06-24 2001-01-16 Daikin Ind Ltd Enclosed compressor and refrigerator therewith

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001012351A (en) 1999-06-24 2001-01-16 Daikin Ind Ltd Enclosed compressor and refrigerator therewith

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