JP2006144771A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor reduced in driving noise by using a low-speed motor and prevented in deterioration of compression ability. <P>SOLUTION: This compressor comprises a sealed container 1, a compression mechanism 10 provided with a compression chamber 11a for compressing refrigerant, a driving unit 20 using a four or more pole type low-speed motor for providing compression power to be required to compress the refrigerant, and a supercharger device 50 for increasing flow-in quantity of the refrigerant flowing into the compression chamber 11a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor, and more particularly, to a compressor that employs a low-speed motor to reduce drive noise and prevent a reduction in compression capacity.

  In general, a refrigeration cycle employed in a refrigerator, an air conditioner, or the like includes a compressor that sucks and compresses a low-pressure refrigerant and discharges the refrigerant in a high-pressure state, a condenser that condenses the refrigerant discharged from the compressor, It consists of an expansion device that expands the refrigerant condensed by the condenser and an evaporator that evaporates the refrigerant expanded by this expansion device and exchanges heat with the surrounding air. These compressors, condensers, expansion units The apparatus and the evaporator form a closed circuit through the refrigerant pipe.

  Therefore, the refrigerant circulating in the refrigeration cycle is condensed by the condenser and releases heat to the surroundings, and is evaporated by the evaporator to absorb the surrounding heat, and the cooling action is performed by the evaporator.

  Among these refrigeration cycles, the compressor is provided inside the sealed container, and includes a compression mechanism that compresses the refrigerant and a motor that provides the compression power required to compress the refrigerant. Are provided with a suction pipe for transmitting the refrigerant on the evaporator side to the inside of the sealed container and a discharge pipe for transmitting the refrigerant compressed by the compression mechanism to the condenser side.

  According to the above configuration, the refrigerant that has flowed from the evaporator into the closed container of the compressor through the suction pipe is compressed by the compression mechanism by driving the motor, and the refrigerant compressed by the compression mechanism is condensed through the discharge pipe. Discharged into the machine.

  On the other hand, in consideration of the capacity of the refrigeration cycle, a two-pole motor having a normal rotation speed of about 3000 rpm to 3600 rpm is usually adopted as the compressor motor for such a refrigeration cycle.

  However, since the compressor of the conventional refrigeration cycle employs a high-speed two-pole motor, there is a problem in that driving noise is greatly increased due to vibration generated by high-speed rotation of the motor.

  In order to reduce the drive noise of such a compressor, it may be possible to employ a low-speed motor having two or more poles such as a four-pole motor having a regular rotational speed of about 1500 rpm to 1800 rpm as the motor. However, in this case, there is a problem in that the compression action of the refrigerant cannot be smoothly performed because the compression capacity of the compressor is reduced by reducing the rotation speed of the motor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a compressor that employs a low-speed motor to reduce drive noise and prevent a reduction in compression capacity.

  In order to achieve the above-mentioned object, the compressor according to the present invention includes a hermetic container, a compression mechanism having a compression chamber for compressing the refrigerant, and four or more poles for providing the compression power required for the refrigerant compression. And a supercharging device for increasing the amount of refrigerant flowing into the compression chamber.

  Further, the supercharging device receives the driving force of the driving unit, compresses the refrigerant inside the sealed container, and transmits the compressed refrigerant to the inside of the compression chamber.

  Further, the drive unit includes a stator fixedly installed in a sealed container, a rotor provided inside the stator, and a rotary shaft press-fitted into the rotor, and the compression mechanism includes the compression mechanism, A cylinder forming a compression chamber, a piston installed inside the compression chamber so as to be able to advance and retreat, an eccentric shaft portion formed at one end of the rotating shaft, and connecting between the eccentric shaft portion and the piston The supercharging device further includes: an auxiliary cylinder that forms a supercharging chamber; an auxiliary piston that is installed in the supercharging chamber so as to freely advance and retract; and the eccentric shaft portion and the auxiliary piston. An auxiliary connecting rod that connects the interior, a suction passage that communicates between the inside of the sealed container and the supercharging chamber, and a discharge passage that communicates between the supercharging chamber and the compression chamber It is characterized by that.

  The auxiliary piston may reach top dead center before the piston reaches top dead center.

  The auxiliary piston may reach bottom dead center when the piston reaches top dead center and reach top dead center when the piston reaches bottom dead center.

  The suction flow path and the discharge flow path are provided with a suction valve and a discharge valve that open and close the suction flow path and the discharge flow path, respectively, opposite to each other.

  The driving unit is a four-pole motor.

  In addition, an oil storage space is formed in a lower portion of the hermetic container, and the driving unit includes a stator fixedly installed in the hermetic container, a rotor provided inside the stator, and press-fitting into the rotor. An oil flow path for supplying oil to the rotation shaft and the friction portion of the compression mechanism is provided on the rotation shaft, and the lower end of the rotation shaft has the oil storage space and the An oil pickup member communicating with the oil flow path is provided, plate-like vanes are press-fitted inside the oil pickup member, and bending is performed in the rotation direction of the rotating shaft at both side corners of the lower portion of the vane. Each of the bent portions is provided, and a bending portion that is bent on the opposite side of the rotation direction of the rotating shaft is provided at both upper corners.

  Further, a four-pole motor is employed for the driving unit, and the bending unit includes a pair of upper bending units provided on the upper side and having a bending angle of 45 °, and a bending unit provided on the lower side of 30 °. And a pair of lower bending portions having corners.

  The compressor according to the present invention employs a low-speed motor having four or more poles in the drive unit to significantly reduce drive noise, thereby enabling quiet operation and rotating by providing the supercharging device. There is an effect that it is possible to prevent a reduction in compression capacity due to the low-speed rotation of the shaft.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1 and FIG. 2, the compressor according to the present invention includes a sealed container 1 in which an upper container 1a and a lower container 1b are joined together, and a compressor for compressing a refrigerant provided inside the sealed container 1. And a drive unit 20 that provides the compression power required to compress the refrigerant. The refrigerant on the evaporator side of the refrigeration cycle is sealed on one side and the other side of the sealed container 1. A suction pipe 2 for guiding the inside of the container 1 and a discharge pipe 3 for discharging the refrigerant compressed by the compression mechanism 10 to the outside of the closed container 1 in order to transmit the refrigerant to the condenser side of the refrigeration cycle are provided.

  The compression mechanism 10 includes a cylinder 11 in which a compression chamber 11a for compressing a refrigerant is formed, a piston 12 that moves forward and backward in the compression chamber 11a to compress the refrigerant, and a cylinder for sealing the compression chamber 11a. 11 and is provided between a cylinder head 13 and a cylinder head 13 in which a refrigerant discharge chamber 13a and a refrigerant suction chamber 13b are partitioned, and is sucked into the compression chamber 11a from the refrigerant suction chamber 13b. Or a valve device 14 that controls the flow of the refrigerant discharged from the compression chamber 11a to the refrigerant discharge chamber 13a. Here, the cylinder 11 is formed integrally with a cylinder block 30 provided on an upper portion of a stator described later.

  The drive unit 20 provides a driving force for the piston 12 to reciprocate inside the compression chamber 11a. The drive unit 20 includes a stator 21 fixed inside the hermetic container 1 and an interior of the stator 21. It is a normal motor provided with a rotor 22 that is spaced apart and electromagnetically interacts with the stator 21, and a rotary shaft 23 that is press-fitted into the center of the rotor 22 and rotates together with the rotor 22. In this motor, a 4-pole motor having a normal rotation speed of 1500 to 1800 rpm at a frequency of 50 to 60 Hz is adopted, and a 4-pole stator is adopted for the stator 21.

  In this way, the drive unit 20 that employs a four-pole low-speed motor reduces the rotation speed of the rotary shaft 23 to about half that of the two-pole motor employed in a compressor of a normal refrigeration cycle, and generates vibrations generated by the rotation of the motor. By significantly reducing the noise, the driving noise of the compressor is reduced to such an extent that it can hardly be felt outside the sealed container 1.

  The rotating shaft 23 is supported by a bearing portion 31 of the cylinder block 30 and extended upward. An eccentric shaft portion 24 that rotates eccentrically and an eccentric shaft portion 24 that rotates eccentrically are formed on the rotating shaft 23. In order to convert to linear motion, one end is coupled to the eccentric shaft portion 24 so as to be capable of rotational movement, and the other end is provided with a connecting rod 25 that is rotatably and linearly installed on the piston 12.

  Further, a suction muffler 41 for reducing the flow noise of the refrigerant flowing into the compression chamber 11a is installed between the refrigerant suction chamber 13b and the suction pipe 2, and the refrigerant discharge chamber 13a and the discharge pipe 3 are disposed. Is provided with a discharge muffler 42 (see FIG. 2) that forms a resonant space for reducing the discharge noise of the refrigerant discharged to the outside of the sealed container 1. The cylinder block 30 is integrally formed on one side of the cylinder 11.

  According to the above configuration, when the power is applied and the rotating shaft 23 rotates together with the rotor 22 due to the electrical interaction between the stator 21 and the rotor 22, the eccentric shaft portion 24 and the connecting rod 25 are connected. The piston 12 is reciprocated linearly inside the compression chamber 11a. Next, the refrigerant that has flowed into the sealed container 1 from the suction pipe 2 flows into the refrigerant suction chamber 13b of the cylinder head 13 in a state where the noise is somewhat reduced while passing through the suction muffler 41, and then the compression chamber 11a. To be compressed in the compression chamber 11a. Next, the refrigerant compressed in the compression chamber 11 a is again discharged into the refrigerant discharge chamber 13 a of the cylinder head 13, and then discharged to the outside of the sealed container 1 through the discharge muffler 42 and the discharge pipe 3. By repeatedly performing the above process, the refrigerant is compressed by the compressor.

  On the other hand, on one side of the cylinder block 30 on the opposite side of the cylinder 11, a supercharging device 50 for increasing the amount of refrigerant flowing into the compression chamber 11a is provided. The compressor according to the present invention employs a low-speed four-pole motor as the drive unit 20 in a normal refrigeration cycle. Satisfies the required refrigerant compression capacity.

  In addition, the supercharging device 50 does not flow into the refrigerant suction chamber 13b of the cylinder head 13 via the suction muffler 41 among the refrigerant flowing into the sealed container 1 through the suction pipe 2. The refrigerant remaining inside is compressed and transmitted to the compression chamber 11a, thereby increasing the refrigerant inflow amount of the compression chamber 11a. Further, the supercharging device 50 is driven by the driving force of the driving unit 20 in order to compress the refrigerant inside the sealed container 1 and transmit it to the compression chamber 11a without installing a separate driving device. However, the structure of such a supercharging device will be described below with reference to FIGS. 3 and 4.

  Here, FIG. 3 shows a state in which the refrigerant inside the sealed container flows into the supercharging chamber, and FIG. 4 shows a state in which the refrigerant in the supercharging chamber is supplied to the compression chamber. .

  As shown in FIGS. 3 and 4, the supercharging device 50 includes an auxiliary cylinder 51 provided integrally with the cylinder block 30 on the opposite side of the discharge muffler 42 in which the internal space forms a supercharging chamber 51 a. An auxiliary piston 52 that advances and retreats inside the supply chamber 51a and compresses the refrigerant in the supercharging chamber 51a, one end of which is rotatably fastened to the auxiliary piston 52 by a ball joint method, and the other end rotates together with the connecting rod 25. By being fastened rotatably to the eccentric shaft portion 24 of the shaft 23, the auxiliary connecting rod 53 provided at a predetermined angle with the connecting rod 25, and the inside of the hermetic container 1 and the supercharging chamber 51a are communicated. The intake passage 54 is configured to include a discharge passage 55 that communicates between the supercharging chamber 51a and the compression chamber 11a.

  Here, the suction flow passage 54 passes through the auxiliary cylinder 51 and communicates between the supercharging chamber 51a and the inside of the sealed container 1, and the discharge flow passage 55 is provided between the supercharging chamber 51a and the compression chamber 11a. The supercharging chamber 51 a and the compression chamber 11 a are communicated with each other through the cylinder block 30, but the outlet of the suction passage 54 and the inlet of the discharge passage 55 are connected to the upper dead center side of the auxiliary piston 52. It is formed at the closed end of the supply chamber 51a.

  Further, at the outlet side of the suction flow path 54, the suction flow path 54 is opened when the auxiliary piston 52 moves to the bottom dead center, and the suction flow path 54 is closed when the auxiliary piston 52 moves to the top dead center. When the auxiliary piston 52 moves to the bottom dead center, the discharge passage 55 is closed and the auxiliary piston 52 moves to the top dead center at the inlet side of the discharge passage 55. In addition, an auxiliary discharge valve 55a that opens the discharge passage 55 and opens and closes opposite to the auxiliary intake valve 54a is installed.

  Further, since the piston 12 and the auxiliary piston 52 are provided so that the auxiliary piston 52 reaches the top dead center before the piston 12 reaches the top dead center, the refrigerant compressed in the supercharging chamber 51a is compressed in the compression chamber. The refrigerant of 11a is transmitted to the compression chamber 11a before being discharged to the refrigerant discharge chamber 13a. For more efficient refrigerant supercharging, the lengths of the connecting rod 25 and the auxiliary connecting rod 53 and the angle between them are used. The eccentric shaft portion 24 that is coaxially extended is formed in two stages having different axes as shown in the drawing, and the connecting rod 25 and the auxiliary connecting rod 53 are provided at each step of the eccentric shaft portion. By connecting the ends, the auxiliary piston 52 reaches the bottom dead center when the piston 12 reaches the top dead center, and the piston 12 reaches the bottom dead center when the piston 12 reaches the top dead center. Or co piston 52 provided so as to reach the upper dead point, the auxiliary piston 52 and it is preferable that the piston 12 is provided so as to more proximate thereto.

  Therefore, in the compressor of the present invention, during the refrigerant compression action of the compression chamber 11a due to the rotation of the rotary shaft 23, the refrigerant inside the sealed container 1 compressed by the supercharging device 50 is transmitted to the compression chamber 11a and is transmitted to the compression chamber 11a. By increasing the inflow amount of the inflowing refrigerant, it is possible to prevent a reduction in compression capacity due to the low speed rotation of the rotating shaft 23 while adopting a four-pole low speed motor as the drive unit 20.

  Referring again to FIG. 1, an oil storage space 1 c for storing a predetermined amount of oil is formed at the bottom of the sealed container 1, and the oil in the oil storage space 1 c is stored inside the rotation shaft 23. 23 and an oil passage 23a that transmits to the friction part of the compression mechanism 10 are formed, and an oil pickup member 60 that communicates the oil storage space 1c and the oil passage 23a is provided at the lower end of the rotating shaft 23.

  The open end of the oil pickup member 60 is press-fitted into the lower end of the rotating shaft 23 and coupled to the rotating shaft 23, and an oil supply hole 61 is formed at the center of the lower end of the oil pickup member 60. Inside, a plate-like vane 70 is installed to form an eddy current between the oil pickup member 60 and the inner surface of the oil pickup member 60 to promote the oil pickup action.

  Therefore, the centrifugal force generated by the rotation of the rotating shaft 23 causes the oil in the oil storage space 1c to be transmitted to the rotating shaft 23 and the friction part of the compression mechanism 10 along the inner surface of the oil pickup member 60 and the oil passage 23a. Provides lubrication and cooling action.

  On the other hand, as shown in FIGS. 5 and 6, the vane 70 includes a main body portion 71 provided in the center portion and bending portions 72, 73, 74, 75 formed in the lower and upper corner portions. These bending portions 72, 73, 74, and 75 include a pair of lower bending portions 72 and 73 that are provided at the lower side corners and bent in the rotation direction of the rotary shaft 23, and upper side corners. And a pair of upper bending portions 74 and 75 that are bent on the opposite side to the rotation direction of the rotary shaft 23.

  These bending portions 72, 73, 74, and 75 prevent a decrease in oil pickup efficiency due to the use of a low-speed motor, and effectively pick up oil in the oil storage space 1c even by the rotating shaft 23 that rotates at a low speed. be able to.

  That is, when the rotating shaft 23 rotates, the lower bending portions 72 and 73 bent in the rotating direction of the rotating shaft 23 act to pump the oil more effectively upward, so that the oil guided upward is Even when the rotary shaft 23 rotates at a low speed by being quickly pumped in the vertical direction through the upper bending portions 74 and 75 before being guided to the upper end of the vane 70, the oil pick-up action is effectively performed.

  Here, it is preferable that the lower bending portions 72 and 73 and the upper bending portions 74 and 75 are bent with a bending angle of 30 ° and 45 °, respectively, when considering the common rotational speed of the 4-pole motor, The vane 70 is press-fitted into the inner surface of the oil pickup member 60 and fixed at a fixed position in a state where the left and right sides are bent with a center as a reference.

  Therefore, the compressor according to the present invention can prevent the oil pick-up action from being lowered due to the low-speed rotation of the rotary shaft 23 while adopting a four-pole low-speed motor as the drive unit 20 by improving the structure of the vane 70. Can do.

  Hereinafter, the operation of the compressor according to the present invention and the operational effects thereof will be described.

  First, when power is applied and the rotating shaft 23 rotates together with the rotor 22 by electrical interaction between the stator 21 and the rotor 22, the piston connected by the eccentric shaft portion 24 and the connecting rod 25. 12 reciprocates linearly inside the compression chamber 11a. Next, the refrigerant outside the sealed container 1 flows from the suction pipe 2 through the suction muffler 30 and flows into the refrigerant suction chamber 13b of the cylinder head 13 with some noise reduction, and is then transmitted to the compression chamber 11a to be compressed. It is compressed inside the chamber 11a. Next, the refrigerant compressed in the compression chamber 11 a is again discharged into the refrigerant discharge chamber 13 a of the cylinder head 13 and then discharged to the outside of the sealed container 1 through the discharge pipe 3. By repeatedly performing the above process, the refrigerant is compressed by the compressor.

  At this time, since the compressor of the present invention employs a four-pole motor as the drive unit 20, the rotational speed of the rotary shaft 23 is reduced to about half that of a normal two-pole motor. Is greatly reduced, and the driving noise of the compressor is reduced to the extent that it is hardly felt outside the sealed container 1.

  In the compressor of the present invention, the refrigerant in the hermetic container 1 compressed by the supercharging device 50 is transmitted to the compression chamber 11a and the refrigerant flows into the compression chamber 11a when the refrigerant is compressed. By increasing the amount, it is possible to prevent a reduction in compression capacity due to the low-speed rotation of the rotary shaft 23 while adopting a four-pole low-speed motor as the drive unit 20. Further, the compressor of the present invention employs a four-pole low-speed motor as the drive unit 20 due to the oil pick-up promoting action of the bend portions 72, 73, 74, and 75 provided in the vane 70, but the rotation shaft 23 It is possible to prevent the oil pickup action from being lowered due to low-speed rotation.

  In the present embodiment, a four-pole motor is employed as the drive unit 20, but the drive unit 20 can employ various other low-speed motors having four or more poles such as a six-pole motor. In addition, when the compressor of the present invention is used to increase the diameter of the compression chamber 11a and the piston 12, the administrative distance of the piston 12, and the like together with the configuration of the supercharging device 50, the refrigerant compression capacity is reduced due to the adoption of a low-speed motor. Can be more effectively compensated.

It is sectional drawing which showed the whole structure of the compressor by this invention. It is the plane sectional view showing the compressor by the present invention. It is sectional drawing which showed the structure of the supercharging device by this invention, Comprising: It is the figure which showed the state in which the refrigerant | coolant inside an airtight container flows in into a supercharging chamber. It is sectional drawing which showed the structure of the supercharging device by this invention, Comprising: It is the figure which showed the state in which the refrigerant | coolant of a supercharging chamber is supplied to a compression chamber. It is the perspective view which showed the vane by this invention. It is the plane sectional view showing the vane by the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Suction pipe 3 Discharge pipe 10 Compression mechanism 11 Cylinder 12 Piston 13 Cylinder head 14 Valve apparatus 20 Drive part 21 Stator 22 Rotor 23 Rotating shaft 24 Eccentric shaft part 25 Connecting rod 30 Cylinder block 31 Bearing part 41 Suction muffler 50 Supercharging Device 51 Auxiliary Cylinder 52 Auxiliary Piston 60 Oil Pickup Member 61 Oiling Hole 70 Vane

Claims (15)

  An airtight container, a compression mechanism having a compression chamber for compressing the refrigerant, a drive unit employing a low-speed motor having four or more poles to provide compression power required for refrigerant compression, and the compression chamber And a supercharging device for increasing an inflow amount of the inflowing refrigerant.   2. The compressor according to claim 1, wherein the supercharging device receives a driving force of the driving unit, compresses the refrigerant in the sealed container, and transmits the compressed refrigerant to the inside of the compression chamber. The drive unit includes a stator fixedly installed in an airtight container, a rotor provided inside the stator, and a rotating shaft press-fitted into the rotor,
The compression mechanism includes a cylinder forming the compression chamber, a piston installed inside the compression chamber so as to freely advance and retract, an eccentric shaft portion formed at one end of the rotating shaft, the eccentric shaft portion, and the piston And a connecting rod for connecting between
The supercharging device includes an auxiliary cylinder that forms a supercharging chamber, an auxiliary piston that is installed in the supercharging chamber so as to freely advance and retreat, and an auxiliary connecting rod that connects between the eccentric shaft portion and the auxiliary piston. And a suction passage that communicates between the inside of the closed container and the supercharging chamber, and a discharge passage that communicates between the supercharging chamber and the compression chamber. 2. The compressor according to 2.   The compressor according to claim 3, wherein the auxiliary piston reaches the top dead center before the piston reaches the top dead center.   The compressor according to claim 4, wherein the auxiliary piston reaches bottom dead center when the piston reaches top dead center, and reaches top dead center when the piston reaches bottom dead center. .   6. The compressor according to claim 5, wherein the suction flow path and the discharge flow path are respectively provided with a suction valve and a discharge valve that open and close the suction flow path and the discharge flow path in opposite directions.   The compressor according to claim 1, wherein the driving unit is a four-pole motor. An oil storage space is formed in the lower part of the sealed container,
The drive unit includes a stator fixedly installed in an airtight container, a rotor provided inside the stator, and a rotation shaft press-fitted into the rotor, and the rotation shaft includes the rotation An oil passage for supplying oil to the shaft and the friction portion of the compression mechanism is provided;
An oil pickup member that communicates the oil storage space and the oil flow path is provided at the lower end of the rotating shaft, and a plate-like vane is press-fitted into the oil pickup member. Bending portions that are bent in the rotational direction of the rotating shaft are respectively provided at the corners on both sides, and bending portions that are bent on the opposite side to the rotating direction of the rotating shaft are respectively provided at the upper side corners. The compressor according to claim 1.   The compressor according to claim 8, wherein the supercharging device receives the driving force of the driving unit, compresses the refrigerant inside the sealed container, and transmits the compressed refrigerant to the inside of the compression chamber. The compression mechanism includes a cylinder forming the compression chamber, a piston installed inside the compression chamber so as to freely advance and retract, an eccentric shaft portion formed at one end of the rotating shaft, the eccentric shaft portion, and the piston And a connecting rod for connecting between
The supercharging device includes an auxiliary cylinder that forms a supercharging chamber, an auxiliary piston that is installed in the supercharging chamber so as to freely advance and retreat, and an auxiliary connecting rod that connects between the eccentric shaft portion and the auxiliary piston. And a suction passage that communicates between the inside of the sealed container and the supercharging chamber, and a discharge passage that communicates between the supercharging chamber and the compression chamber. The compressor described.   The compressor according to claim 10, wherein the auxiliary piston reaches the top dead center before the piston reaches the top dead center.   The compressor according to claim 11, wherein the auxiliary piston reaches a top dead center when the piston reaches bottom dead center, and reaches the bottom dead center when the piston reaches top dead center. .   13. The compressor according to claim 12, wherein the suction flow path and the discharge flow path are respectively provided with a suction valve and a discharge valve that open and close the suction flow path and the discharge flow path.   The compressor according to claim 8, wherein the driving unit is a four-pole motor.   The driving unit employs a four-pole motor, and the bending unit is provided on the upper side with a pair of upper bending units having a bending angle of 45 °, and provided on the lower side with a bending angle of 30 °. The compressor according to claim 8, further comprising a pair of lower bending parts.

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