KR102314232B1 - hermetic compressor - Google Patents

Abstract

The compression mechanism of the hermetic compressor includes a hollow cylinder, a crankshaft rotating by an electric motor, a rolling piston fitted to an eccentric shaft of the crankshaft and rotating eccentrically along an inner circumferential surface of the cylinder, and a refrigerant compression chamber in a high-pressure region and It has a vane dividing into the low pressure area|region, and a spring which biases the vane to the outer peripheral surface of a rolling piston so that it may follow the eccentric rotation of a rolling piston. The container which accommodates the spring is provided in the trunk|drum of an airtight container. The container has a weak part whose strength with respect to an external force directed to the outside of the sealed container from the shaft center of the crankshaft is lower than that of the sealed container, and communicates with the compression chamber. The receiver is positioned so that the length along the radial direction of the cylinder from the shaft center of the crankshaft to the weak part is not shorter than the length along the radial direction of the cylinder from the shaft center of the crankshaft to the outer peripheral surface of the sealed container.

Description

hermetic compressor

The present invention relates to a hermetic compressor that can be used in a refrigeration apparatus, an air conditioning apparatus, a hot water supply apparatus, or the like.

In a refrigeration cycle in a conventional refrigeration apparatus or the like, an abnormal high pressure may be generated in the compressor due to, for example, an unexpected rise in the condensing temperature due to an abnormality in the cooling fan of the condenser. When abnormal high pressure is generated in the compressor, it is common to stop the compression operation in the compressor by the high-pressure cut protection device provided on the discharge side of the compressor. However, when an operation abnormality occurs in the high-pressure cut protection device, a pressure higher than the allowable amount is applied to the refrigerating cycle, and there is a risk of damaging the piping in the refrigerating cycle part other than the compressor. For this reason, by providing a part of the weak point in the pipe during the refrigeration cycle and covering it with a film, when an abnormal high pressure occurs in the compressor, damage to the refrigerant pipe is caused at the weak point, and the expansion of the damaged area is prevented by the film There are some that make it possible (for example, refer to Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2000-130896

When air is mixed into the compressor from the suction side of the compressor, compression is performed in a state in which the refrigeration oil inside the compressor is in the form of mist, and the pressure on the high pressure side inside the compressor may rise abnormally at a very high speed. In such a case, damage to the compressor and damage to the piping to which the compressor is connected occur. In addition, since the damage to equipment installed around the compressor is expanded, a countermeasure in which such damage does not occur is required. However, the configuration of the weak point of the refrigerant pipe in Patent Document 1 assumes damage to the refrigerant pipe caused by a load caused by an abnormal increase in refrigerant pressure or repeated refrigerant pressure change. Therefore, when the pressure on the high-pressure side inside the compressor rises abnormally at a very high speed, the configuration described in Patent Document 1 cannot cope.

The present invention has been made to solve the above problems, and even when the pressure inside the compressor rises abnormally at a very high speed, it provides a hermetic compressor that can prevent damage to equipment installed around the compressor in advance. aim to

A hermetic compressor according to the present invention includes a hermetic container, a compression mechanism unit accommodated in the hermetic container and compressing a refrigerant, and an electric motor accommodated in the hermetic container and driving the compression mechanism portion, wherein the compression mechanism portion is hollow of a cylinder, a crankshaft rotating by the electric motor, a rolling piston fitted to an eccentric shaft of the crankshaft and rotating eccentrically along an inner circumferential surface of the cylinder, and an inner circumferential surface of the cylinder and an outer circumferential surface of the rolling piston A hermetic compressor comprising: a vane dividing a refrigerant compression chamber into a high-pressure region and a low-pressure region; provided, and having a receiver accommodating the spring, wherein the receiver has a weaker portion having a lower strength with respect to an external force from the shaft center of the crankshaft toward the outside of the sealed container than the sealed container, and is in communication with the compression chamber, , so that the length in the radial direction of the cylinder from the shaft center of the crankshaft to the weak part is not shorter than the length in the radial direction of the cylinder from the shaft center of the crankshaft to the outer peripheral surface of the sealed container, the receiver is location is determined.

According to the hermetic compressor according to the present invention, even if the gas in the compression chamber rapidly expands at a very high speed and the pressure in the compression chamber rises abnormally, the fragile portion is preferentially ruptured rather than other components of the compression mechanism portion. Therefore, the sealed state of the high-pressure space in the airtight container is eliminated, and a rise in pressure can be prevented. Accordingly, damage to the compressor and damage to the piping to which the compressor is connected are prevented, and damage to equipment installed around the compressor can be prevented in advance.

1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention;
Fig. 2 is a plan view showing a compression mechanism of the hermetic compressor according to the embodiment of the present invention;
Fig. 3 is a diagram showing the configuration of a receptor according to an embodiment of the present invention;

EMBODIMENT OF THE INVENTION Below, embodiment of the hermetic compressor in this invention is described in detail based on drawing. In addition, this invention is not limited by embodiment demonstrated below. In addition, in the following drawings, the size and shape of each structural member may differ from an actual apparatus.

(Embodiment)

1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention. The hermetic compressor (1) has an airtight container (10), a compression mechanism (20) for compressing a refrigerant, and an electric motor (30) for driving the compression mechanism (20). The compression mechanism part 20 and the electric motor 30 are accommodated in the sealed container 10 . The compression mechanism unit 20 is located in the lower part of the sealed container 10 , and the electric motor 30 is positioned in the upper part of the sealed container 10 .

The electric motor 30 is comprised by a DC motor, for example. The electric motor 30 has a stator 31 and a rotor 32 . The stator 31 is being fixed to the inner peripheral surface of the sealed container 10 . The rotor 32 is arranged inside the stator 31 . Power is supplied to the stator 31 from a terminal (not shown) fixed to the sealed container 10 .

The compression mechanism portion 20 includes a cylinder 21 , a frame 22 , a cylinder head 23 , a crankshaft 24 , and a rolling piston 25 . The cylinder 21 is a cylindrical hollow member, and both ends in the axial direction are open. Among the both ends of the cylinder 21 in the axial direction, the frame 22 is provided at the end farther from the mounting surface of the hermetic compressor 1, ie, at the upper end in FIG. 1 . The frame 22 has a T-shape in cross-sectional shape, and a disk-shaped portion closes the opening of the cylinder 21 . Among the both ends of the cylinder 21 in the axial direction, the cylinder head 23 is provided at the end closer to the mounting surface of the hermetic compressor 1 , ie, at the lower end in FIG. 1 . The cylinder head 23 has a T-shape in cross-sectional shape, and a disk-shaped portion closes the opening of the cylinder 21 . The crankshaft 24 inserts the cylinder 21 , the frame 22 , and the cylinder head 23 . The crankshaft 24 rotates by the driving force of the rotor 32 of the electric motor 30 . The rolling piston 25 is fitted to the eccentric shaft of the crankshaft 24 and rotates eccentrically along the inner peripheral surface of the cylinder 21 . A compression chamber 26 is formed on the inner peripheral surface of the cylinder 21 and the outer peripheral surface of the rolling piston 25 .

The hermetic compressor 1 has a suction pipe 12 , a gas-liquid separator 13 , and a discharge pipe 14 . The suction pipe 12 is connected to an evaporator not shown in the refrigerating cycle in which the hermetic compressor 1 is a component. The refrigerant flowing out of the evaporator flows into the gas-liquid separator 13 through the suction pipe 12 , and is guided from the gas-liquid separator 13 to the cylinder 21 . The discharge pipe 14 is connected to a condenser not shown in the refrigeration cycle in which the hermetic compressor 1 is a component. The high-pressure refrigerant in the sealed container 10 is sent to the refrigeration cycle through the discharge pipe 14 .

Refrigeration oil 11 is stored in the bottom of the sealed container 10 . The refrigerating machine oil 11 is guided to the compression mechanism part 20 through the crankshaft 24 by an oil supply mechanism not shown, and each part of the compression mechanism part 20 is lubricated.

The hermetic container 10 is being fixed to the support leg 15 in a state perpendicular|vertical with respect to an installation surface. The hermetic compressor 1 is usually installed on a horizontal surface such as the ground. That is, the sealed container 10 is fixed and installed along a vertical direction normally.

Fig. 2 is a plan view showing the compression mechanism of the hermetic compressor according to the embodiment of the present invention. FIG. 2 conceptually shows the configuration of the compression mechanism unit 20 . In Fig. 2, the crankshaft 24 is omitted, and its axial center is indicated by the reference numeral 24A. Also, some members are notched and the internal structure is shown. The compression mechanism 20 includes a vane 27 , a spring 28 , and a receiver 29 . The spring 28 is, for example, a compression coil spring. The vane 27 is a rectangular thin plate-shaped member. The vane 27 is provided so as to be slidable along the radial direction in the slit 21A formed in the radial direction in the cylinder 21 . The end 26A of the vane 27 located in the cylinder 21 is in contact with the outer peripheral surface of the rolling piston 25 slidably. The vane 27 divides the compression chamber 26 into a high-pressure region and a low-pressure region, and blocks the high-pressure region and the low-pressure region.

The container 29 is a cylindrical member, and is being fixed to the trunk|drum of the sealed container 10, as shown in FIG. A spring 28 is accommodated inside the receiver 29 . The first end 29A, which is one end of both ends of the container 29, is located outside the sealed container 10, and the second end 29B, which is the other end of both ends of the container 29, is a cylinder 21. It is located inside the barrel of That is, the receiver 29 is arrange|positioned so that the 2nd end 29B may be located at the side of the shaft center 24A of the crankshaft 24, and the shaft center of the receiver 29 may follow the radial direction of the cylinder 21. As shown in FIG. The spring 28 applies a biasing force to the shaft center 24A of the crankshaft 24 along the radial direction with respect to the vane 27 .

3 : is a figure which shows the structure of the receptor which concerns on embodiment of this invention. A bottom face 291 is provided at the first end 29A, and the first end 29A is closed by the bottom face 291 . The second end 29B is open. The receiver 29 communicates with the compression chamber 26 through the second end 29B and the slit 21A. The inner diameter of the receiver 29 is larger than the outer diameter of the spring 28 . The left winding of the spring 28 is in contact with the bottom surface 291 . An annular groove 292 is formed in the bottom surface 291 . The groove 292 is formed so that its center coincides with the axial center 29C of the receiver 29 . The outer diameter of the groove 292 is larger than the diameter of the left winding of the spring 28 , and the width of the groove 292 is larger than the wire diameter of the spring 28 . Among the left windings at both ends of the spring 28 , the left winding on the opposite side to the shaft center 24A of the crankshaft 24 is disposed in the groove 292 .

In addition, the receiver 29 has a weak portion 293 . The weak portion 293 is a thin portion in which the thickness in the direction along the axis 29C of the receiver 29 is thinner than other portions of the bottom surface 291 because the groove 292 is formed. As described above, the second end portion 29B is located on the side of the shaft center 24A of the crankshaft 24 , and the receiver 29 is aligned in the radial direction of the cylinder 21 . That is, the weak portion 293 is a thin portion whose thickness in the direction from the shaft center 24A of the crankshaft 24 toward the outside of the sealed container 10 is thinner than other portions of the bottom surface 291 . Accordingly, the weak portion 293 has a strength against an external force from the axial center 24A of the crankshaft 24 toward the outside of the cylinder 21 along the radial direction of the cylinder 21 in another portion of the bottom surface 291 . comparatively weak. In addition, the thickness of the weak part 293 in the direction along the axis center 29C of the container 29 is determined based on the target pressure limit value in the sealed container 10. As shown in FIG.

As described above, the first end 29A of the container 29 is located outside the sealed container 10 . That is, the length along the radial direction of the cylinder 21 from the shaft center 24A of the crankshaft 24 to the weak portion 293 of the receiver 29 is from the shaft center 24A to the outer peripheral surface of the sealed container 10 . The housing 29 is positioned so that it does not become shorter than the length along the radial direction of the cylinder 21 .

Here, the operation of the hermetic compressor 1 will be described. Refrigerant gas is sucked into the cylinder 21 through the gas-liquid separator 13 from the suction pipe 12 connected to the evaporator side, which is the low pressure side of the refrigeration cycle. The sucked refrigerant gas is compressed in the compression chamber 26 by the rolling piston 25 eccentrically moved by the rotation of the eccentric part of the crankshaft 24, and compressed from the low-pressure low-temperature suction gas to the high-pressure high-temperature discharge gas. do. The discharge gas which has become this high temperature is discharged|emitted inside the sealed container 10, and is sent out from the discharge pipe 14 to the condenser of a refrigeration cycle.

The refrigerating machine oil 11 stored in the bottom of the hermetic container 10 passes through the inside of the rolling piston 25 in the centrifugal direction when the mounting surface of the hermetic compressor 1 is the bottom, and passes through the compression chamber 26 ) is supplied in The refrigerating machine oil 11 is in the form of a mist when mixed with the refrigerant gas which has become high pressure in the compression chamber 26 and discharged into the sealed container 10 .

When air is mixed into the suction side of the refrigeration cycle from the outside of the refrigeration cycle due to a cause such as poor piping connection when installing the refrigeration cycle or damage to the low-pressure side piping after refrigeration cycle operation, the air is sucked into the compression chamber 26 . and compressed When air is compressed and mist-shaped refrigeration oil 11 of a predetermined concentration exists therein, combustion and an abnormal rise in pressure at a very high speed occur depending on the concentration and ambient temperature conditions.

When such a phenomenon occurs in the compression chamber 26, the gas in the compression chamber 26 rapidly expands at a very high speed. At this time, the above-described weak portion 293 is formed on the bottom surface 291 of the receiver 29 of the spring 28 . Therefore, when the compression chamber 26 forms a pressure field equal to or higher than the design pressure in the airtight container, it is preferentially fractured by the low rigidity of the weak portion 293 of the container 29 .

Effects of the present embodiment will be described. As described above, when the gas in the compression chamber 26 rapidly expands at a very high speed due to suction in the compression chamber 26, the combustion gas that has expanded rapidly can escape in the discharge path for discharging the normal refrigerant gas. can't For this reason, the pressure in the compression chamber 26 rises abnormally, and the part with the smallest intensity|strength of the compression mechanism part 20 will be damaged. On the other hand, according to this embodiment, the bottom surface 291 is preferentially fractured rather than other components of the compression mechanism part 20 due to the low rigidity of the weak part 293 of the bottom surface 291 of the receiver 29 . Therefore, when the gas in the compression chamber 26 rapidly expands at a very high speed, the sealed state of the high-pressure space in the sealed container 10 is eliminated, and the pressure increase can be prevented.

In addition, the receiver 29 accommodates the spring 28 . And, as described above, the spring 28 gives the vane 27 the followability to the eccentric rotation of the rolling piston 25, and the compression chamber 26 separates the low-pressure region and the high-pressure region, thereby establishing a compressor mechanism. there is an absence Due to the breakage of the weak portion 293 of the receiver 29, the bottom surface 291 in contact with the left winding on the opposite side to the shaft center 24A of the crankshaft 24 of the spring 28 is partially or entirely lost. Thereby, the left winding on the side opposite to the shaft center 24A of the crankshaft 24 of the spring 28 loses a bearing surface, and the function as a spring is lose|disappeared. The biasing force of the spring 28 against the vane 27 is released. For this reason, the function of the vane 27 which divides the compression chamber 26 into a low-pressure area|region and a high-pressure area|region is lost. Since the followability of the vane 27 is lost along with the loss of the biasing force of the spring 28, the pressure rise in the sealed container 10 can be prevented without being controlled.

As described above, when the pressure in the compression mechanism portion 20 is greater than or equal to a predetermined pressure, the fragile portion 293 of the receiver 29 is broken, and the pressure rise is prevented by eliminating the sealing property of the compression mechanism portion 20 . At the same time, the function of separating the low-pressure region and the high-pressure region of the compression mechanism portion 20 of the compression chamber 26 of the vane 27 is lost due to the loss of the biasing force of the spring 28 . Accordingly, the compression function of the hermetic compressor 1 can be stopped when an abnormal increase in the pressure in the hermetic container 10 occurs.

In addition, in this embodiment, the 1st end 29A of the container 29 is located outside the sealed container 10, and the bottom surface 291 and the weak part 293 are located outside the sealed container 10. In addition, although the container 29 protrudes from the sealed container 10, it is not limited to this. For example, the container 29 may be positioned so that the outer peripheral surface of the bottom surface 291 and the outer peripheral surface of the sealed container 10 may become the same surface.

1: hermetic compressor 10: hermetic container
11: refrigeration oil 12: suction pipe
13: gas-liquid separator 14: discharge pipe
15: support leg 20: compression mechanism part
21: cylinder 22: frame
23: cylinder head 24: crankshaft
24A: shaft center 25: rolling piston
26: compression chamber 26A: end
27: vane 28: spring
29: receptor 29A: first end
29B: second end 29C: shaft center
30: electric motor 31: stator
32: rotor 291: bottom
292: home 293: vulnerable part

Claims (3)

an airtight container, a compression mechanism unit accommodated in the airtight container and compressing a refrigerant, and an electric motor accommodated in the airtight container and driving the compression mechanism;
The compression mechanism includes a hollow cylinder, a crankshaft rotating by the electric motor, a rolling piston fitted to an eccentric shaft of the crankshaft and rotating eccentrically along an inner circumferential surface of the cylinder, and an inner circumferential surface of the cylinder and the rolling A hermetic compressor having a vane that divides a compression chamber of the refrigerant formed on the outer circumferential surface of the piston into a high-pressure region and a low-pressure region, and a spring that biases the vane to the outer circumferential surface of the rolling piston to follow the eccentric rotation of the rolling piston,
It is provided in the body portion of the sealed container and includes a receiver for accommodating the spring,
The receiver communicates with the compression chamber having a weaker portion having a strength with respect to an external force directed to the outside of the sealed container from the shaft center of the crankshaft is lower than that of the sealed container,
The receiver is positioned such that the length in the radial direction of the cylinder from the shaft center of the crankshaft to the weakened portion is not shorter than the length in the radial direction of the cylinder from the shaft center of the crankshaft to the outer peripheral surface of the sealed container. A hermetic compressor, characterized in that it is determined. According to claim 1,
The receiver is a cylindrical member,
One end of the both ends of the container is provided with a bottom, the one end is closed by the bottom, and the other end of the both ends of the container is open;
The receiver is arranged such that the other end is located on the axial center side of the crankshaft, and the axial center of the receiver is along the radial direction of the cylinder,
The hermetic compressor, characterized in that the weak portion is formed by a groove formed in an annular shape on the bottom surface. 3. The method of claim 2,
The hermetic compressor, characterized in that the left winding of the spring is disposed in the groove.

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