KR20040021140A - Variable capacity rotary compressor - Google Patents

Abstract

PURPOSE: A variable capacity rotary compressor is provided to vary capacity of a rotary compressor even if the rotary frequency of the compressor is not limited. CONSTITUTION: A housing(320) has a cylindrical compression chamber(310) inside. A rotary shaft(210) has an eccentricity part(350) rotating inside the compressor chamber. A roller(360) is rotatively installed on an outer surface of the eccentricity part in a state that the outer surface contacts with an inner surface of the compressor chamber. A vane is installed in the housing to advance and retreat in a radius direction of the compressor chamber in a state that the front end contacts with an outer surface of the roller when the roller rotates. The vane is formed of a first vane(610) and a second vane(620) dividable in a direction vertical to an axial direction. A restriction element(700) restricts the first vane to separate a front end of the first vane from the outer surface of the roller.

Description

Variable Capacity Rotary Compressors {VARIABLE CAPACITY ROTARY COMPRESSOR}

The present invention relates to a rotary compressor, and more particularly, to a variable displacement rotary compressor provided to change the compression capacity of the refrigerant without controlling the rotational speed of the compressor by adding a simple mechanical configuration.

In general, a cooling device applied to an air conditioner or a refrigerator adopts a variable capacity rotary compressor that allows the cooling capacity to be varied so that the cooling capacity of the refrigerant can be varied and the compression capacity of the refrigerant is changed for energy saving purposes. Doing.

As shown in FIGS. 1 and 2, the displacement variable rotary compressor includes a driving mechanism 20 for generating a rotational force in the sealed container 10 forming the exterior of the compressor, and the driving mechanism 20 and the rotating shaft 21. It is provided with a compression mechanism (30) connected through.

The drive mechanism 20 includes a cylindrical stator 22 fixed to the inner surface of the sealed container 10, a rotor 23 installed to be rotatable inside the stator 22, and the rotor 23. It is composed of the rotary shaft 21 is press-fitted and rotates like the rotor 23. And the compression mechanism 30 is formed in the center of the compression chamber 31 of the cylindrical shape and the outer surface is fixed to the inner surface of the sealed container 10 and the upper and lower openings of the compression chamber 31 Upper and lower flanges 33 and 34 coupled to the upper and lower portions of the housing 32 so as to rotatably support the rotating shaft 21 at the same time.

An eccentric portion 35 is provided on the rotation shaft 21 inside the compression chamber 31, and a cylindrical roller 36 is rotatably coupled to the outer surface of the eccentric portion 35. At this time, the eccentric rotation of the roller 36 is configured such that the outer surface rotates in contact with the inner surface of the compression chamber 31.

In addition, a suction port 37 communicating with an internal compression chamber 31 is formed at one side of the housing 32, and a refrigerant suction pipe 40 is connected to the suction port 37, and a compression chamber (3) is provided at the upper flange 33. A discharge port 38 is formed to allow 31 to communicate with the interior of the hermetic container 10. In addition, the upper portion of the hermetic container 10 is provided with a refrigerant discharge tube 50 for discharging the compressed refrigerant in the hermetic container 10 toward the condenser of a conventional cooling device.

In addition, the housing 32 has a suction space (31a) and the discharge port (1) which communicates the inside of the compression chamber 31 with the suction port 37 while advancing in the radial direction of the compression chamber 31 when the roller 36 is rotated ( A vane 60 that is slidably mounted to be partitioned into a compression space 31b communicating with 38 is installed, and a vane spring 61 providing a restoring force to the vane 60 at a rear end of the vane 60. Is connected.

The conventional variable capacity rotary compressor configured as described above is rotated by the induction current generated between the stator 22 and the rotor 23 when power is applied, and the rotating shaft 21 rotates, and the roller rotates by the rotation of the rotating shaft 21. The 36 is eccentrically rotated to suck the refrigerant toward the suction port 37 and discharge the pressure toward the discharge port 38.

On the other hand, such a conventional variable displacement rotary compressor is formed to vary the compression capacity of the refrigerant to perform the optimal cooling to meet the requirements, the variable compression capacity of the refrigerant is made by controlling the rotational speed of the compressor.

However, in such a conventional variable capacity rotary compressor, the rotational speed control of the compressor is performed by controlling a frequency for driving the drive mechanism unit 20 by using a separate drive drive, wherein the drive drive is relatively expensive to manufacture the compressor. It was a factor that led to a significant increase in costs. In addition, the drive drive is configured through a complicated circuit, which causes a problem that the maintenance of the compressor is very difficult.

The present invention is to solve such a problem, an object of the present invention is to separate the vane of the rotary compressor into a first vane and a second vane, and to install a restraining means on the first vane to limit the number of revolutions of the compressor If not, it is to provide a variable displacement rotary compressor in which the capacity of the rotary compressor is variable depending on the restriction of the first vane.

1 is a longitudinal cross-sectional view showing the configuration of a conventional variable displacement rotary compressor.

2 is a lateral cross-sectional view showing the configuration of a conventional variable displacement rotary compressor.

3 is a longitudinal cross-sectional view showing a configuration of a capacity variable type rotary compressor according to the first embodiment of the present invention.

4 is a lateral cross-sectional view showing a configuration of a capacitive variable rotary compressor according to the first embodiment of the present invention.

5 is a lateral cross-sectional view showing a main configuration of a capacitive variable rotary compressor according to a second embodiment of the present invention.

6 is a longitudinal cross-sectional view showing a main configuration of a variable displacement rotary compressor according to a third embodiment of the present invention.

7 is a cross-sectional view showing the structure of the vanes of the variable displacement compressor according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: sealed container 210: rotating shaft

310: compression chamber 311: suction space

312: compression space 313: vane coupling groove

320: housing 350: eccentric portion

360: roller 370: inlet

380: discharge port 400: refrigerant suction pipe

610: first vane 700: restraining means

710: cylinder 711: locking jaw

720: piston 721: locking pin

730: first elastic member 740: second elastic member

750: first euro 751: first communication tube

760: Euro 276: second communion

770: Euro 377: Third Correspondence

780: flow path variable valve

In order to achieve the above object, the present invention provides a housing in which a cylindrical compression chamber is formed therein, a rotation shaft having an eccentric portion rotating in the compression chamber, and an outer surface of the eccentric portion in contact with an inner surface of the compression chamber. In a rotary compressor having a roller rotatably installed in the vane and a vane provided in the housing such that the roller is retracted in the radial direction of the compression chamber in a state in which the tip thereof is in contact with the outer surface of the roller when the roller rotates. A first vane and a second vane configured to be separated from each other in a direction perpendicular to the axial direction are provided. It is characterized in that the restraining means is connected.

And the restraining means is installed to allow the cylinder to be coupled to the outside of the housing to restrain the first vane by the pressure of the suction side and the discharge side of the compressor, and to move back and forth in the operating direction of the vane inside the cylinder. A piston for retractably accommodating a rear end of the first vane therein, a first flow passage formed to communicate with the inside of the cylinder, a second flow passage provided to communicate the discharge side of the compressor with the first flow passage, And a flow path variable valve provided at a point at which the suction side of the compressor and the first flow path communicate with each other, and the first, second, and third flow paths connected to each other.

In addition, the flow path variable valve is characterized in that the first passage is a three-way valve to selectively communicate with one of the second passage and the third passage.

The restraining means may further include a first elastic member provided between the piston and the rear end of the cylinder, and a second elastic member installed between the first vane and the rear end of the piston.

In addition, the elasticity of the first elastic member is characterized in that it is provided larger than the elasticity of the second elastic member.

In addition, the restraining means includes a restraint groove provided on one side of the first vane, an auxiliary spring installed at the rear of the first vane to elastically support the first vane, and a retraction to be inserted into the restraint groove. And a solenoid switch connected to the restraint pin to advance and restrain the restraint pin.

In addition, the housing is provided with a mounting groove formed in a direction perpendicular to the longitudinal direction of the vane so that the solenoid switch is mounted, the solenoid switch is a solenoid coil fixed to the inside of the mounting groove, the power is supplied to the solenoid coil As applied, it is provided to be able to move back and forth in the solenoid coil and is characterized in that it comprises a plunger coupled to the restraining pin at the top.

In addition, the restraining means is characterized in that it comprises an electromagnet coupled to the housing to attract and restrain the rear end of the first vane.

In addition, the restraining means is characterized in that it further comprises an auxiliary elastic member which is installed on the rear of the first vane to elastically support the first vane.

The first vane may be smaller than the second vane.

In addition, the coupling section of the first vane and the second vane is characterized in that the close contact with each other to enable parallel movement without mutual interference.

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

3 and 4, the variable displacement rotary compressor according to the present invention includes a drive mechanism part 200 for generating a rotational force in the sealed container 100 forming the exterior of the compressor, and the drive mechanism part 200 and the rotating shaft. It is provided with a compression mechanism (300) connected via (210).

The drive mechanism 200 has a cylindrical stator 220 fixed to the inner surface of the hermetic container 100, a rotor 230 installed to be rotatable inside the stator 220, and the rotor 230. It is composed of a rotating shaft 210 that is press-fitted and rotates like the rotor 230. The compression mechanism 300 has a cylindrical compression chamber 310 formed at the center thereof, and a housing 320 having an outer surface fixed to an inner surface of the hermetic container 100, and an open upper and lower portions of the compression chamber 310. At the same time, the upper and lower flanges 330 and 340 are coupled to the upper and lower portions of the housing 320 to rotatably support the rotating shaft 210.

In addition, an eccentric portion 350 is provided on the rotating shaft 210 inside the compression chamber 310, and a cylindrical roller 360 is rotatably coupled to an outer surface of the eccentric portion 350. At this time, the eccentric rotation of the roller 360 is configured such that the outer surface is in contact with the inner surface of the compression chamber 310 to rotate.

In addition, a suction port 370 is formed at one side of the housing 320 in communication with the compression chamber 310 therein, and the suction port 370 flows into the suction port 370 at a low temperature low pressure refrigerant at an evaporator of a conventional cooling device. The refrigerant suction pipe 400 to be guided so as to be connected is connected, and the accumulator 410 is installed in the middle of the refrigerant suction pipe 400. In addition, a discharge port 380 is formed in the upper flange 330 to allow the compression chamber 310 to communicate with the interior of the sealed container 100, and a discharge valve 390 is installed at an outlet side of the discharge port 380. A refrigerant discharge pipe 500 is installed above the sealed container 100 to discharge the compressed refrigerant in the sealed container 100 toward the condenser of the conventional cooling device.

In addition, when the roller 360 rotates, the housing 320 retreats in the radial direction of the compression chamber 310 in contact with the outer surface of the roller 360 to move the inside of the compression chamber 310. A vane 600 is partitioned into a suction space 311 communicating with the suction port 370 and a compression space 312 communicating with the discharge port 380, and the housing 320 allows the vane 600 to move forward and backward. Guiding vane coupling groove 313 is formed.

In addition, these components suck the refrigerant toward the suction port 370 and pressurize toward the discharge port 380 while the roller 360 rotates eccentrically in the compression chamber 310 when the eccentric part 350 of the rotating shaft 210 rotates. Allow discharge.

On the other hand, in the variable displacement rotary compressor according to the present invention, the vanes 600 are provided with a first vane 610 and a second vane 620 configured to be separated from each other in a direction perpendicular to the axial direction. A vane spring 621 is provided at the rear end of the second vane 620 to impart the restoring force of the second vane 620, and the first vane 610 restrains the first vane 610 to restrain the first vane 610. Constraining means is connected so that the tip portion of the one vane 610 can be spaced apart from the outer surface of the roller 360.

Therefore, the variable displacement rotary compressor according to the present invention can release the refrigerant compression action in the compression chamber 310 as the first vane 610 can be restrained through the restraining means. By adjusting the restraint period of 610 it is possible to vary the capacity of the compressor. In addition, the first vane 610 may be smaller than the second vane 620 so that energy due to the restraint of the first vane 610 may be further reduced.

The restraining means may be provided in various forms. Next, the restraining means according to the first embodiment of the present invention for restraining the operation of the first vane 610 by using the pressure of the suction side and the discharge side of the compressor will be described. Do it.

As shown in FIGS. 3 and 4, the restraining means 700 according to the first embodiment of the present invention has a cylindrical cylinder having a front end coupled to an outer surface of the sealed container 100 outside the first vane 610. 710 and a piston 720 installed inside the cylinder 710 to move back and forth in the operating direction of the vane 600 and receiving a rear end portion of the first vane 610 in a retractable manner therein. do. In this case, a locking jaw 711 is formed on the inner surface of the front end of the cylinder 710 to have a predetermined length inside the cylinder 710 to prevent the piston 720 from being separated. A locking pin 721 is provided to allow the rear end of the vane 610 to be supported. A bent portion 611 is formed at a rear end of the first vane 610 to be bent in a direction perpendicular to the longitudinal direction of the first vane 610 so as to be caught by the locking pin 721.

In addition, a first elastic member 730 is installed between the piston 720 and the rear end of the cylinder 710 to elastically support the piston 720 toward the front end side of the cylinder 710, and the first vane 610. Between the piston 720 and the rear end is provided a second elastic member 740 for elastically supporting the first vane 610 to the outer surface side of the roller 360.

In addition, the restraining means 700 is a first communication tube (751) coupled to the rear end of the cylinder 710 to form a first flow path 750 communicating with the interior of the cylinder 710, the discharge side of the compressor and the first The second flow path 760 is formed so that the first flow path 750 communicates with the second communication pipe 761 branched from the refrigerant discharge pipe 500 and connected to the first communication pipe 751, and the suction side of the compressor. The third passage 770 is formed so that the first passage 750 communicates with each other. The third passage 770 is branched from the refrigerant suction pipe 400 to be connected to a point at which the first communication tube 751 and the second communication tube 761 are connected. Three communication pipes 771 are provided.

The first passage 750 is selectively connected to one of the second passage 760 and the third passage 770 at a point where the first, second, and third communication pipes 751, 761, 771 are interconnected. The flow path variable valve 780 is installed. At this time, the flow path variable valve 780 is composed of a conventional three-way valve operated by an electrical control signal.

In this configuration, the first flow path 750 and the second flow path 760 communicate with each other by the operation of the flow path variable valve 780 so that the pressure of the refrigerant discharge pipe 500 is applied to the rear of the piston 720. In this case, as shown in FIG. 3, the piston 720 having the same pressure applied to the front and rear sides thereof is pushed by the first elastic member 730 to move the cylinder 710 to the front side. At this time, since the restraint of the first vane 610 is released, the first vane 610 is elastically supported by the second elastic member 740 and the outer surface of the roller 360 as the second vane 620. In the state in close contact with the roller 360 is moved forward and backward. And the refrigerant compressed in the compression chamber 310 by the roller 360 is discharged through the discharge port 380 and the refrigerant discharge pipe 500, the compressor performs a normal refrigerant compression function.

When the first flow path 750 and the third flow path 770 communicate with each other by the operation of the flow path variable valve 380, the pressure of the refrigerant suction pipe 400 is applied to the rear of the piston 710. As shown in FIG. 4, the piston 720 whose pressure applied to the front becomes larger than the pressure applied to the rear side pressurizes the first elastic member 730 and moves to the rear side in the cylinder 710. In this case, since the first vane 610 is restrained and the tip of the first vane 610 is spaced apart from the outer surface of the roller 360, the roller 360 is idling and the compression chamber 310. There is no compression of the refrigerant inside.

Next will be described with respect to the restraining means 800 according to the second embodiment of the present invention.

As shown in FIG. 5, the restraining means 800 according to the second embodiment of the present invention includes a restraining groove 810 provided on one side of the first vane 610, and the first vane 610. Auxiliary spring 820 installed at the rear of the first vane 610 to support the elasticity, and the restraining pin 830 is provided to be retractable to be inserted into the restraint groove 810, and the restraining pin 830 It includes a solenoid switch connected to the restraining pin 830 to advance). In this case, a mounting groove 840 formed in a direction perpendicular to the longitudinal direction of the vane coupling groove 313 is installed in the housing 320 so as to be in communication with the vane coupling groove 313 so that the solenoid switch is installed. The switch is provided so that the solenoid coil 850 fixedly installed inside the mounting groove 840 and the solenoid coil 850 can be retracted from the inside of the solenoid coil 850 as the power is applied. The plunger 860 has a pin 830 coupled thereto. Accordingly, the restraining pin 830 enters into the vane coupling groove 313 by the plunger 860 advancing in the solenoid coil 850 and can be inserted into the restraint groove 810.

When power is not applied to the solenoid coil 850 through this structure, the operation pin 830 is located inside the mounting groove 840, and the first vane 610 is restrained. It is elastically supported by the auxiliary spring 820 and allows the refrigerant compression stroke of the compressor to operate normally.

When power is applied to the solenoid coil 850, the restraint pin 830 enters into the vane coupling groove 313 and is inserted into the restraint groove 810 according to the operation of the plunger 860. Accordingly, the first vane 610 is spaced apart from the outer surface of the roller 360 by a predetermined interval.

Next, the restraining means 900 according to the third embodiment of the present invention will be described with reference to FIG. 6.

As shown in FIG. 6, the restraining means 900 according to the third embodiment of the present invention is an electromagnet 910 coupled to the housing 320 so as to attract and restrain the rear end of the first vane 610. And an auxiliary elastic member 920 installed at the rear of the first vane 610 to elastically support the first vane 610.

In this case, the electromagnet 910 includes a body 930 coupled to an outer surface of the housing 3200, a metal piece 940 coupled to the body 930 and formed toward the first vane 610, and the first The vane 610 is constrained by movement of the vane 610 by the rear end of the first vane 610 in contact with the metal piece 940 by the operation of the electromagnet 910, the first vane 610 is the metal piece 940 The metal piece 940 is preferably formed of a metal material having good investment property so that the metal piece 940 can be easily contacted.

In addition, the auxiliary end of the first vane 610 is extended to the upper and lower sides of the first vane 61 so that the auxiliary elastic member 920 is coupled to the same area to be secured to the metal piece 940 is secured. Preferably, the unit 950 is provided.

When the electromagnet 910 is operated through this structure, the first vane 610 pressurizes the auxiliary elastic member 920 and is attached to the metal piece 940 to constrain its operating state. At the same time as the release of the operation is spaced apart from the metal piece 920 and the restrained state is released to operate normally in a state that is elastically supported by the auxiliary elastic member 920.

In addition, as shown in Figure 7, in the variable displacement rotary compressor according to the present invention, the coupling end surface of the first vane 610 and the second vane 620 is the first vane 610 and the second The vanes 620 may be provided in various forms under the condition of allowing parallel movement without mutual interference and maintaining close contact with each other.

As described above, the variable displacement rotary compressor according to the present invention can constrain the first vane 610 separated from the second vane 620 through a simple mechanical configuration such as the restraining means 700, 800, and 900. By controlling the restraint period of the vane 610, it is possible to effectively change the capacity of the compressor without controlling the rotational speed of the compressor.

In addition, the displacement variable rotary compressor restrains only the first vane 610 forming a part of the vane 600 so that the capacity of the compressor is variable, thereby generating relatively less energy than when restraining the entire vane 600. Through this has the effect of varying the capacity of the compressor.

As described in detail above, the variable displacement rotary compressor according to the present invention is provided with a first vane and a second vane configured to be separated from each other in a direction perpendicular to the axial direction, and the first vane is formed from an outer surface of the roller. Combining the restraining means to be spaced apart to the first vane, it has the advantage that the capacity change of the compressor can be effectively made by adjusting the restraint period of the first vane without controlling the rotational speed of the compressor.

Claims (11)

A roller having a cylindrical compression chamber formed therein, a rotating shaft having an eccentric portion rotating in the compression chamber, a roller rotatably installed on an outer surface of the eccentric portion with an outer surface contacting the inner surface of the compression chamber, In a rotary compressor having a vane provided in the housing so that when the rotation is in the radial direction of the compression chamber in the state where the front end is in contact with the outer surface of the roller, The vane is provided with a first vane and a second vane configured to be separated from each other in a direction perpendicular to the axial direction. Capacity variable rotary compressor characterized in that the restraining means is connected to be spaced apart. The method of claim 1, The restraining means is provided with a cylinder coupled to the outside of the housing to restrain the first vane by the pressure of the suction side and the discharge side of the compressor, and installed inside the cylinder to be able to move back and forth in the operation direction of the vane. A piston for retractably accommodating the rear end of the first vane, a first flow passage formed to communicate with the interior of the cylinder, a second flow passage provided to communicate the discharge side of the compressor with the first flow passage, and the compressor And a third flow path formed so that the suction side of the first flow path and the first flow path communicate with each other, and a flow path variable valve installed at a point at which the first, second, and third flow paths are connected to each other. The method of claim 2, And the flow path variable valve is a three-way valve for allowing the first flow path to selectively communicate with one of the second flow path and the third flow path. The method of claim 2 The restraining means further comprises a first elastic member installed between the piston and the rear end of the cylinder, and a second elastic member installed between the first vane and the rear end of the piston. The method of claim 4, wherein The elasticity of the first elastic member is a variable displacement rotary compressor, characterized in that provided is larger than the elasticity of the second elastic member. The method of claim 1, The restraining means may include a restraining groove provided on one side of the first vane, an auxiliary spring installed at the rear of the first vane to elastically support the first vane, and a retractable groove to be inserted into the restraining groove. And a solenoid switch connected to the restraining pin to advance and restrain the restraining pin. The method of claim 6, The housing is provided with a mounting groove formed in a direction perpendicular to the longitudinal direction of the vane so that the solenoid switch is mounted, the solenoid switch is a solenoid coil fixed to the inside of the mounting groove and the power is applied to the solenoid coil The variable displacement rotary compressor according to claim 1, wherein the solenoid coil has a plunger coupled to the restraining pin. The method of claim 1, The restraining means may include an electromagnet coupled to the housing to attract and restrain the rear end of the first vane. The method of claim 8, The restraining means further comprises an auxiliary elastic member installed behind the first vane to elastically support the first vane. The method of claim 1, And the first vane is smaller than the second vane. The method of claim 1, The coupling section of the first vane and the second vane is a variable capacity rotary compressor, characterized in that the close contact with each other to enable parallel movement without mutual interference.