KR20100083257A - Device for preventing reverse rotation of compressor and method for controlling the same used in refrigerator unit and heat pump - Google Patents

Device for preventing reverse rotation of compressor and method for controlling the same used in refrigerator unit and heat pump Download PDF

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Publication number
KR20100083257A
KR20100083257A KR1020090002553A KR20090002553A KR20100083257A KR 20100083257 A KR20100083257 A KR 20100083257A KR 1020090002553 A KR1020090002553 A KR 1020090002553A KR 20090002553 A KR20090002553 A KR 20090002553A KR 20100083257 A KR20100083257 A KR 20100083257A
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KR
South Korea
Prior art keywords
compressor
refrigerant gas
pressure
differential pressure
pipe
Prior art date
Application number
KR1020090002553A
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Korean (ko)
Inventor
홍관영
Original Assignee
주식회사 아림엔지니어링
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Application filed by 주식회사 아림엔지니어링 filed Critical 주식회사 아림엔지니어링
Priority to KR1020090002553A priority Critical patent/KR20100083257A/en
Publication of KR20100083257A publication Critical patent/KR20100083257A/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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F04C2210/00—Fluid
    • F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
    • 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
    • F04C2240/40—Electric motor
    • 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
    • F04C2270/70—Safety, emergency conditions or requirements
    • F04C2270/72—Safety, emergency conditions or requirements preventing reverse rotation
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/902—Hermetically sealed motor pump unit

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)

Abstract

PURPOSE: A reverse rotation prevention apparatus of a compressor for a freezing unit and a heat pump and a control method thereof are provided to prevent the damage of a compressor due to a reverse rotation and to extend the lifespan of a heat pump and a freezing unit to which a scroll compressor is applied. CONSTITUTION: A reverse rotation prevention apparatus of a compressor for a freezing unit and a heat pump comprise a pipe for detecting intake pressure(22), a pipe for detecting discharge pressure(32), a differential pressure switch(40), and an interruption contact. One end of the pipe for detecting intake pressure is connected to the given position of the refrigerant gas intake pipe(20) of a scroll compressor(100). One end of the pipe for detecting discharge pressure is connected to the given position of the refrigerant gas discharge pipe(30) of the scroll compressor. The differential pressure switch is installed on the other end of the pipe for detecting intake pressure to operate depending on the predetermined differential pressure between the discharge pressure and the intake pressure of refrigerant gas. The interruption contact is connected with the differential pressure switch by a wire and stops the compressor.

Description

Device for preventing reverse rotation of compressor and method for controlling the same used in refrigerator unit and heat pump}

The present invention relates to a reverse rotation preventing device of a refrigeration unit and a heat pump compressor, and a control method thereof, and more particularly, to detect a pressure at a suction side and a discharge side of a screw compressor or a scroll compressor applied to a refrigeration unit and a heat pump. The present invention relates to a reverse rotation preventing device and a control method of a compressor for a refrigeration unit and a heat pump, which can prevent damage to the compressor by preventing a reverse rotation of the compressor due to the pressure change.

In general, the scroll compressor is a high efficiency low noise compressor widely applied to the air conditioner field, and the two scrolls are relatively pivoted to form a plurality of compression chambers between the scrolls, and the compression chamber continuously moves in the center direction. It becomes smaller and operates by continuously sucking, compressing and discharging the refrigerant gas.

Referring to Figure 3 attached to the scroll compressor operated in this way as follows.

As shown in FIG. 3, the scroll compressor has a main frame 2 and a subframe 3 coupled to the inside of the sealed container 1 having a predetermined internal space, and the main frame 2 and the subframe ( A stator 4 and a rotor 5 constituting a motor are installed between 3), and a rotation shaft 6 provided with an eccentric portion 6a is attached to the main frame 2 and the subframe 3, respectively. In addition to being inserted into the rotor (5).

In addition, the fixed scroll (7) is fixedly coupled to the upper side of the main frame (2), the pivoting scroll (8) is inserted between the main frame (2) and the fixed scroll (7) to enable a relatively pivoting movement.

The fixed scroll 7 and the turning scroll 8 are formed with wraps 7a and 8a which protrude in an involute curve shape, and the wrap 8a of the turning scroll 8 is fixed scroll 7. It is meshed so as to be able to turn to the wrap 7a.

In addition, a boss portion 8b having a predetermined outer diameter and length protruding from the turning scroll 8 is inserted into an insertion hole 2b having a predetermined inner diameter and a predetermined depth formed in the main frame 2, Then, the rotation shaft 6 is inserted into the shaft insertion hole 2c formed through the insertion hole 2b of the main frame 2, and the pivoting scroll 8 and the main frame 2 between the pivoting scroll ( The old dam ring 9 which prevents the rotation of 8) is combined.

On the other hand, the high and low pressure separating plate 10 for separating the interior of the sealed container (1) into a high pressure and a low pressure on the upper surface of the fixed scroll (7) is coupled by a plurality of fastening bolts 11 and the fixed scroll (7) The valve stopper 12 and the check valve 13 are mounted to prevent backflow of the refrigerant gas discharged through the discharge port 7b.

At this time, the suction tube 14, the refrigerant gas is sucked to the low pressure side of the sealed container (1) is coupled, the discharge tube 15 for discharging the refrigerant gas is coupled to the high pressure side, and the The oil is supplied to the bottom portion of the rotary shaft 6 through the oil flow path 6b formed in the sliding portion.

Reference numeral 7c denotes a suction port, 16 denotes a fastening bolt, 8c denotes a turning scroll plate, and P denotes a compression pocket.

Referring to the operation of the scroll compressor of such a configuration as follows.

First, when the rotor 5 forming the motor is rotated by the applied power, the rotational force is rotated through the rotation shaft eccentric 6a while the rotation shaft 6 press-fitted to the rotor 5 rotates. And then, the turning scroll 8 is rotated by engaging the fixed scroll 7 while being prevented from rotating by the old dam ring 9.

Subsequently, the refrigerant gas introduced through the suction pipe 14 by the pivoting motion of the swing scroll 8 passes through the suction port 7c formed at one side of the fixed scroll 7 to pivot with the fixed scroll 7. It is sucked into the compression pocket P formed by the wraps 7a and 8a of the scroll 8.

Subsequently, the compression pocket P moves toward the center by the swinging motion of the swinging scroll 8 and gradually decreases in volume to compress the refrigerant gas to discharge the refrigerant gas through the discharge port 7b. .

On the other hand, the scroll compressor, which operates as described above, becomes a state in which the check valve 13 opens the discharge port 7b by the discharge pressure in the normal operation state of the refrigeration unit or the heat pump, and operates due to power supply interruption or other reasons. At the time of stop, the check valve 13 is lowered by the pressure of the high pressure part to block the discharge port 7b, thereby preventing the gas of the high pressure part from flowing to the low pressure part and preventing the reverse rotation of the scroll compressor caused by the flow of the refrigerant gas back. can do.

However, when the motor of the scroll compressor is used as a single-phase motor, the torque of the rotating shaft is lower than that of the compressed gas pressure due to the lack of torque, so that the reverse scroll of the swing scroll 8 may occur. If the motor is using a three-phase motor, the direction of rotation of the motor is reversed due to the incorrect wiring of the three-phase power supply, and the motor rotates in the opposite direction to normal operation.Therefore, a collision occurs between components linked to the turning scroll, which causes noise and abnormal vibration. There is a problem that occurs to damage the compressor itself.

In consideration of these problems, conventionally, when the power supply to the motor is reversed, the machine may be damaged or become a dangerous state. Thus, the reverse phase protection for preventing the motor from rotating in reverse when the current phase is changed when the motor is operated is input. The device was installed separately and used.

However, in the case of assembling the coil in the reverse direction during the assembly of the compressor, the reverse phase protection device alone cannot protect the compressor. Consequently, damage to the compressor may cause damage to the refrigeration unit and the heat pump to reduce the service life or reduce efficiency. In addition, there is a problem that needs to replace the expensive compressor.

The present invention has been made to solve the above problems, the suction and discharge side of the screw compressor or scroll compressor in addition to the reverse phase protection device installed to prevent the reverse rotation to the screw compressor or scroll compressor applied to the refrigeration unit and the heat pump. The anti-rotation device and the control method of the compressor for the refrigeration unit and the heat pump to prevent damage to the compressor by detecting the pressure of the compressor and stop the compressor immediately by detecting the reverse rotation of the compressor according to the pressure change. The purpose is to provide.

The present invention for achieving the above object and the suction pressure detection pipe which is connected to the one end portion of the refrigerant gas suction side pipe of the scroll compressor in communication; A discharge pressure detecting pipe connected to one end portion of the scroll compressor at a predetermined position of the refrigerant gas discharge side pipe; A differential pressure switch installed at each other end of the suction pressure detecting pipe and the discharge pressure detecting pipe and turned on / off according to a set differential pressure between the discharge pressure and the suction pressure of the refrigerant gas; It provides a reverse rotation preventing device of the compressor for the refrigeration unit and heat pump comprising a; stop contact of the compressor is connected to the differential pressure switch and the compressor to stop the compressor.

In addition, the present invention is provided with a differential pressure switch which is operated according to the differential pressure set in the suction pressure detection pipe connected in communication with the refrigerant gas suction side pipe of the scroll compressor and the discharge pressure detection pipe connected in communication with the refrigerant gas discharge side pipe of the scroll compressor. A control method of a reverse rotation prevention device of a compressor, comprising: allowing refrigerant gas to flow through the suction pressure detection pipe and at the same time the suction pressure of the refrigerant gas acts on the differential pressure switch; Allowing refrigerant gas to flow through the discharge pressure detecting pipe and at the same time, discharge pressure of the refrigerant gas is applied to the differential pressure switch; Determining that the scroll compressor is inversely rotated so that the differential pressure switch is turned off when the differential pressure value obtained by subtracting the refrigerant gas inlet pressure from the refrigerant gas discharge pressure applied to the differential pressure switch is smaller than the set pressure of the differential pressure switch; Providing a control method of a reverse rotation preventing device of a compressor for a refrigeration unit and a heat pump, comprising: turning off the stop contact of the compressor connected to the differential pressure switch and the wiring by turning off the differential pressure switch. do.

In the present invention, the set pressure of the differential pressure switch is characterized in that 0.05 ~ 0.1Mpa, when the refrigerant gas discharge pressure is higher than 0.05 ~ 0.1Mpa, the set pressure of the differential pressure switch compared to the refrigerant gas suction pressure, the scroll compressor It is determined that the normal operation is characterized in that the differential pressure switch is kept in the on state.

The present invention has the following effects through the problem solving means described above.

According to the present invention, by connecting a pressure detecting pipe between a refrigerant gas suction side and a discharge side of a scroll compressor, and installing a differential pressure switch therein, the refrigerant gas suction pressure and the refrigerant gas discharge pressure are simultaneously applied to the differential pressure switch during normal operation of the scroll compressor. When the differential pressure between the refrigerant gas discharge pressure and the refrigerant gas suction pressure is lower than the set pressure of the differential pressure switch, the scroll compressor is judged to be reversely rotated to stop the compressor, thereby preventing damage to the compressor due to reverse rotation. Furthermore, it is possible to extend the life and improve the efficiency of the refrigeration unit and the heat pump to which the scroll compressor is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention detects the pressure on the suction side and the discharge side of a screw compressor or a scroll compressor applied to a refrigeration unit and a heat pump and stops the compressor by detecting the reverse rotation of the compressor according to the pressure change, thereby preventing damage to the compressor due to the reverse rotation. The focus is on one point to avoid.

For the purpose of understanding the present invention, a scroll compressor will be described by way of example. Looking at the pressure change of the refrigerant gas at the suction side and the discharge side of the scroll compressor at the time of normal operation, stop, and reverse rotation of the scroll compressor, same.

The scroll compressor applied to the refrigeration unit and the heat pump has a pressure value at the suction side when the pressure value at the suction side is compared to the pressure value at the discharge side during normal operation of the scroll compressor. Appear lower.

When the scroll compressor applied to the refrigerating unit and the heat pump is stopped, the pressure value on the suction side and the pressure value on the discharge side of the scroll compressor are compared. Similarly, as shown in FIG. 2, the pressure value on the suction side is the pressure on the discharge side. It is lower than the value.

On the other hand, in the reverse rotation of the scroll compressor applied to the refrigeration unit and the heat pump, when the pressure value of the suction side and the pressure side of the scroll compressor are compared, as shown in FIG. It is higher than the pressure value.

On the other hand, the pressure value at the suction side of the compressor at the forward rotation when the scroll compressor operates normally is the same as the pressure value at the suction side of the scroll compressor at the stop, and the pressure value at the discharge side of the scroll compressor at the forward rotation is the scroll compressor at the stop. Is formed higher than the pressure value on the discharge side.

In addition, the pressure value at the suction side during the reverse rotation of the scroll compressor applied to the refrigerating unit and the heat pump is higher than the pressure value at the suction side at the stop, and the pressure value at the discharge side during the reverse rotation is higher than the pressure value at the discharge side at the stop. Formed low.

Based on the principle that the refrigerant gas pressure change on the suction side and the discharge side of the scroll compressor during the normal rotation, stop and reverse rotation of the scroll compressor applied to the refrigeration unit and the heat pump is formed as described above, In order to prevent damage to the compressor by stopping the operation of the compressor during the reverse rotation of the scroll compressor.

1 is a schematic view showing a reverse rotation prevention apparatus of a refrigeration unit and a heat pump compressor according to the present invention.

As shown in FIG. 1, one end of the suction pressure detecting pipe 22 is connected to a predetermined position of the suction pipe 20 connected to the suction pipe 14 through which the refrigerant gas of the scroll compressor 100 is sucked. One end of the discharge pressure detecting pipe 32 is connected to a predetermined position of the discharge side pipe 30 connected to the discharge pipe 15 through which the refrigerant gas is discharged.

In addition, the other end of the suction pressure detection pipe 22 and the discharge pressure detection pipe 32 is provided with a differential pressure switch 40 to be turned on / off according to the differential pressure.

In addition, the differential pressure switch 40 is connected to the stop contact (not shown) of the scroll compressor applied to the refrigeration unit and the heat pump.

Referring to the operation and the control method of the reverse rotation prevention device of the refrigeration unit and heat pump compressor according to the present invention configured as described above are as follows.

As described above, in the reverse rotation of the scroll compressor, the pressure value at the suction side of the refrigerant gas is higher than the pressure value at the discharge side, and at the stop of the scroll compressor, the pressure value at the discharge side of the refrigerant gas is somewhat higher than the pressure value at the suction side. In the present invention, when the scroll compressor operates normally or stops, the moment when the differential pressure between the refrigerant gas suction pressure and the discharge pressure of the compressor indicates a difference higher than the set pressure is determined as reverse rotation so that the compressor can be stopped before the compressor rotates reversely. It is.

First, when the scroll compressor 100 is normally operated, the refrigerant gas is sucked into the compressor through the suction pipe 14 and the suction side pipe 20 of the scroll compressor 100 and the suction pressure connected to the suction side pipe 20. The refrigerant gas also flows through the detection pipe 22, and the suction pressure of the refrigerant gas flowing through the suction pressure detection pipe 22 subsequently acts on the differential pressure switch 40.

At the same time, the refrigerant gas is discharged through the discharge pipe 15 and the discharge side pipe 30 of the scroll compressor 100 and the refrigerant gas is also discharged through the discharge pressure detection pipe 32 connected to the discharge side pipe 30. The discharge pressure of the refrigerant gas flowing through the discharge pressure detecting pipe 32 is subsequently applied to the differential pressure switch 40.

As such, during the normal operation of the scroll compressor 100, the refrigerant gas suction pressure and the refrigerant gas discharge pressure simultaneously act on the differential pressure switch 40 so that the refrigerant gas discharge pressure is equal to the refrigerant gas discharge pressure when the scroll compressor 100 is stopped. When the pressure value which is slightly higher than the suction pressure but the refrigerant gas discharge pressure minus the refrigerant gas suction pressure is smaller than 0.05 to 0.1 Mpa, which is the set pressure of the differential pressure switch, the scroll compressor 100 is determined to be reversely rotated. 40) is turned off. Here, the setting value of the differential pressure switch is set to 0.05 to 0.1 Mpa because the differential pressure switch for preventing the reverse rotation of the compressor is smoothly operated.

Accordingly, the scroll compressor is stopped by turning off the stop contact (not shown) of the compressor connected to the differential pressure switch 40 by wiring according to the turn off of the differential pressure switch 40. Damage can be prevented, and furthermore, the life of the refrigeration unit and heat pump to which the scroll compressor is applied can be extended and the efficiency can be improved.

On the other hand, when the refrigerant gas suction pressure and the refrigerant gas discharge pressure simultaneously act on the differential pressure switch 40, the refrigerant gas discharge pressure is higher than the refrigerant gas suction pressure, but is higher than the set pressure of the differential pressure switch 0.05 ~ 0.1Mpa or more In response to determining that the scroll compressor operates normally, the differential pressure switch is kept on.

1 is a schematic view showing a reverse rotation prevention apparatus of a refrigeration unit and a heat pump compressor according to the present invention.

Fig. 2 is a schematic diagram illustrating the change in pressure of the suction side and the discharge side at the time of stopping, forward rotation and reverse rotation of the scroll compressor.

3 is a cross-sectional view showing a scroll compressor.

<Explanation of symbols for the main parts of the drawings>

14: suction pipe 15: discharge pipe

20: suction side piping 22: suction pressure detection piping

30: discharge side piping 32: discharge pressure detection piping

40: differential pressure switch 100: scroll compressor

Claims (4)

A suction pressure detecting pipe 22 having one end thereof connected to a predetermined position of the refrigerant gas suction side pipe 20 of the scroll compressor 100; A discharge pressure detection pipe (32) connected at one end thereof to a predetermined position of the refrigerant gas discharge side pipe (30) of the scroll compressor (100); A differential pressure switch (40) installed at the other end of each of the suction pressure detecting pipe (22) and the discharge pressure detecting pipe (32) and turned on / off according to a set differential pressure between the discharge pressure and the suction pressure of the refrigerant gas; Reverse stop device of the refrigeration unit and heat pump compressor, characterized in that it comprises a; stop contact of the compressor connected to the differential pressure switch 40 to stop the compressor. A suction pressure detecting pipe 22 connected in communication with the refrigerant gas suction side pipe 20 of the scroll compressor 100 and a discharge pressure detecting pipe 32 connected in communication with the refrigerant gas discharge side pipe 30 of the scroll compressor. In the control method of the reverse rotation prevention device of the compressor provided with a differential pressure switch 40 that operates according to the set differential pressure, Allowing refrigerant gas to flow through the suction pressure detecting pipe (22) and at the same time the suction pressure of the refrigerant gas is applied to the differential pressure switch (40); Allowing refrigerant gas to flow through the discharge pressure detecting pipe (32) and at the same time the discharge pressure of the refrigerant gas is applied to the differential pressure switch (40); When the differential pressure value obtained by subtracting the refrigerant gas suction pressure from the refrigerant gas discharge pressure applied to the differential pressure switch 40 is smaller than the set pressure of the differential pressure switch, the scroll compressor 100 is determined to be reversely rotated, and the differential pressure switch 40 is turned off. Making a; The compressor 100 is stopped by turning off the stop contact of the compressor connected to the differential pressure switch 40 by wiring according to the differential pressure switch 40 is off; Refrigeration unit and heat pump compressor Control method of reverse rotation prevention device. The method according to claim 2, The set pressure of the differential pressure switch 40 is a control method of the reverse rotation preventing device of the compressor for the refrigeration unit and heat pump, characterized in that to be 0.05 ~ 0.1Mpa. The method according to claim 2 or 3, When the refrigerant gas discharge pressure becomes higher than 0.05 ~ 0.1Mpa, which is the set pressure of the differential pressure switch 40, compared to the refrigerant gas suction pressure, it is determined that the scroll compressor 100 operates normally, and the differential pressure switch 40 is kept on. The control method of the anti-rotation device of the refrigeration unit and heat pump compressor, characterized in that the holding.
KR1020090002553A 2009-01-13 2009-01-13 Device for preventing reverse rotation of compressor and method for controlling the same used in refrigerator unit and heat pump KR20100083257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090002553A KR20100083257A (en) 2009-01-13 2009-01-13 Device for preventing reverse rotation of compressor and method for controlling the same used in refrigerator unit and heat pump

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Application Number Priority Date Filing Date Title
KR1020090002553A KR20100083257A (en) 2009-01-13 2009-01-13 Device for preventing reverse rotation of compressor and method for controlling the same used in refrigerator unit and heat pump

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KR20100083257A true KR20100083257A (en) 2010-07-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112146227A (en) * 2020-08-31 2020-12-29 珠海格力电器股份有限公司 Pressure detection switch, air conditioner control method and device, air conditioner and storage medium
US11499767B2 (en) 2018-04-09 2022-11-15 Carrier Corporation Reverse rotation prevention in centrifugal compressor
US11754073B2 (en) 2019-01-11 2023-09-12 Lg Electronics Inc. Compressor fault diagnostic apparatus and system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11499767B2 (en) 2018-04-09 2022-11-15 Carrier Corporation Reverse rotation prevention in centrifugal compressor
US11754073B2 (en) 2019-01-11 2023-09-12 Lg Electronics Inc. Compressor fault diagnostic apparatus and system
CN112146227A (en) * 2020-08-31 2020-12-29 珠海格力电器股份有限公司 Pressure detection switch, air conditioner control method and device, air conditioner and storage medium
CN112146227B (en) * 2020-08-31 2022-04-12 珠海格力电器股份有限公司 Pressure detection switch, air conditioner control method and device, air conditioner and storage medium

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