JPH07332268A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the abnormal increase of a pressure in a cylinder chamber owing to compression of liquid, to reliably prevent the breakage of peripheral equipment, such as a blade and a delivery valve, owing to compression of liquid as size and weight are reduced through reduction of the weight of the whole of a compressor, and to improve reliability. CONSTITUTION:In a rotary compressor, a bypass passage 6 to communicate a compression chamber X with a back chamber 27 when a blade 5 is advanced to the vicinity of a forwardmost position in a cylinder chamber 21 is formed in the blade 5. Even when a liquid refrigerant is sucked in the cylinder chamber 21 and liquid compression operation is carried out, the abnormal increase of a pressure owing to liquid compression is prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor mainly used for refrigeration equipment.

[0002]

2. Description of the Related Art Conventionally, a cylinder chamber is formed in a cylinder,
A roller that rotates with the eccentric rotation of the eccentric portion of the drive shaft is installed in the cylinder chamber, and a blade that divides the cylinder chamber into a compression chamber and a suction chamber can slide with the eccentric rotation of the roller. For example, a rotary compressor described in Japanese Patent Application Laid-Open No. 4-183989 is known as a rotary compressor installed inside.

That is, in a conventional rotary compressor, as shown in FIG. 7, a cylinder chamber B1 is formed in a cylinder B provided in a closed casing A, and a roller C is rotatably provided in the cylinder chamber B1. At the same time, the eccentric portion D1 of the drive shaft D is inserted into the roller C, and the rotation of the eccentric portion D1 causes the roller C to eccentrically rotate in the cylinder chamber B1. A blade sliding groove B2 extending to the
The roller C is constantly operated by the spring E1 arranged on the back side thereof.
The blade E, which is pressed against the outer peripheral surface of the
The blade E divides the inside of the cylinder chamber B1 into a compression chamber X in which the discharge port a is opened and a suction chamber Y in which the suction port b is opened.

[0004]

However, in the above rotary compressor, the liquid refrigerant may be sucked into the cylinder chamber B1 to perform the liquid compression operation at the time of start-up or defrost operation. When the liquid compression operation is performed,
When the blade E advances to the vicinity of the most advanced position into the cylinder chamber B1 while being in pressure contact with the roller C, a rapid pressure increase occurs in the compression chamber X.

That is, as shown in the graph of FIG. 6 showing the relationship between the rotation angle of the drive shaft and the internal pressure of the cylinder chamber, the roller C comes closest to the discharge port a at the top dead center (FIG. 6).
From the position (0 degree position in) to the bottom dead center d by being eccentrically rotated by 180 degrees with the rotation of the drive shaft D,
Before reaching the bottom dead center d (around 170 degrees from the top dead center), as shown by the dotted line in the graph of FIG. 6, a rapid pressure increase due to liquid compression occurs in the compression chamber X, and this pressure is increased. Due to the rise, the blade E, the discharge valve disposed in the discharge port a, and other peripheral devices may be damaged.

In particular, when high hertz driving is performed,
Since the drive shaft D is rotated at high speed, the discharge port a
The opening and closing of the discharge valve (not shown) that opens and closes is delayed with the eccentric rotation of the roller C, and liquid refrigerant accumulates on the side opposite to the discharge port of the discharge valve, making it difficult to open the discharge valve. Since the escape due to the discharge of the compressed gas compressed in the compression chamber X from the discharge port a cannot be caught up, the pressure in the compression chamber X becomes higher, and the damage accident of the blade E or the like becomes more likely to occur. is there.

In consideration of the pressure rise as described above,
Conventionally, the drive shaft D of the drive motor arranged in the casing A and other structures are designed to have a sturdy structure, but in this case, the entire compressor becomes large and heavy. There was a problem.

An object of the present invention is to prevent abnormal pressure rise in the cylinder chamber due to liquid compression, reduce the weight of the compressor as a whole, and reduce the size and weight of the compressor. It is an object of the present invention to provide a rotary compressor capable of reliably preventing damage to peripheral devices such as the valve 25 and improving reliability.

[0009]

In order to achieve the above object, the invention according to claim 1 provides a cylinder 2 and a cylinder chamber 2.
1, the eccentric portion 4 of the drive shaft 4 is formed in the cylinder chamber 21.
The roller 3 that rotates with the eccentric rotation of No. 1 is installed, and the blade 5 that divides the cylinder chamber 21 into the compression chamber X and the suction chamber Y is installed so as to be slidable with the eccentric rotation of the roller 3. In the rotary compressor, the escape passage 6 is formed in the blade 5 so that the compression chamber X communicates with the blade back chamber 27 near the most advanced position of the blade 5 into the cylinder chamber 21.

According to a second aspect of the present invention, the blade 5
A hole 62 whose one end opens to the compression chamber X in the vicinity of the most advanced position of the blade 5 into the cylinder chamber 21 and the other end opens to the blade back chamber 27. The escape passage 6 communicating with the chamber 27 is formed.

According to a third aspect of the present invention, one end of the blade 5 on the side of the compression chamber on the side of the compression chamber has a cylinder chamber 21 of the blade 5.
A relief passage 6 for communicating the compression chamber X with the blade back chamber 27 is provided by providing a groove 61 that opens to the compression chamber X near the most advanced position inside and has the other end open to the blade back chamber 27.
Was formed.

According to a fourth aspect of the present invention, the cylinder chamber 21 is provided in the cylinder 2, and the cylinder chamber 21 is provided with a compression chamber X and a suction chamber Y.
A blade sliding groove 22 for slidably mounting a blade 5 which is partitioned into and is formed in the cylinder chamber 21.
In a rotary compressor in which the roller 3 rotating with the eccentric rotation of the eccentric part 41 and the blade 5 sliding with the eccentric rotation of the roller 3 are installed, the blade 5 in the blade sliding groove 22 On the sliding surface 22a with the side surface of the compression chamber, there is formed the escape passage 6 for communicating the compression chamber X with the back chamber 27 of the blade 5 in the vicinity of the most advanced position of the blade 5 into the cylinder chamber 21. is there.

According to a fifth aspect of the present invention, the roller 3 which is fitted into the eccentric portion 41 of the drive shaft 4 is revolvably mounted in the cylinder chamber 21 of the cylinder 2 so that the cylinder chamber 21 is compressed by the roller 3. A blade 5 that divides the chamber X and the suction chamber Y is integrally provided so as to project, and the blade 5 is connected to the cylinder 2
In a swing type rotary compressor swingably supported by a blade receiving portion 81 of a support body 8 which is rotatably disposed in the inside of the blade receiving portion 81 of the support body 8 and a side surface of the blade 5 on the compression chamber side. In the sliding surface 82, the escape passage 6 is formed which allows the compression chamber X to communicate with the back chamber 27 of the blade 5 in the vicinity of the most advanced position of the blade 5 into the cylinder chamber 21.

According to a sixth aspect of the invention, in the oscillating rotary compressor according to the fifth aspect, the blade back chamber 27 is a closed space.

[0015]

In the invention according to claim 1, the cylinder chamber 21
Even when the liquid refrigerant is sucked into the inside and the liquid compression operation is performed, when the blade 5 advances to the vicinity of the most advanced position into the cylinder chamber 21, the escape passage 6 formed in the blade 5 causes Since the compression chamber X and the blade back chamber 27 are communicated with each other, before the pressure inside the compression chamber X suddenly rises due to liquid compression by the liquid refrigerant inside the compression chamber X, the escape passage 6 The liquid refrigerant can escape to the blade back chamber 27.

Therefore, even if the liquid refrigerant flows into the cylinder chamber 21, the liquid refrigerant is promptly discharged from the escape passage 6 to the blade rear chamber 27 before the pressure rises rapidly in the compression chamber X. Since it can be released, it is possible to prevent a sudden pressure increase in the compression chamber X from occurring, and it is possible to reliably prevent the blade 5 and other peripheral devices from being damaged. , Reliability can be improved.

Moreover, it is not necessary to make the drive shaft 4 of the motor and other structures of a sturdy structure capable of withstanding a sudden pressure rise, so that the overall weight can be reduced and the size and weight can be reduced. Of.

Further, in the invention as set forth in claim 2, the escape passage 6 is provided with the cylinder chamber 21 of the blade 5 at one end.
Since the opening 62 is formed in the compression chamber X near the most advanced position inside and the other end is opened in the blade back chamber 27, the lubricating oil that lubricates the sliding surface of the blade 5 is diluted by the liquid refrigerant. The liquid refrigerant in the compression chamber X can be quickly released to the blade back surface chamber 27 by the escape passage 6 formed by the hole 62 without causing deterioration of the lubrication performance due to the measurement.

Further, in the invention according to claim 3, the relief passage 6 is formed on the side surface of the blade 5 on the compression chamber side, and one end of the blade 5 is compressed near the most advanced position of the blade 5 into the cylinder chamber 21. Since the groove 61 is formed in the chamber X and the other end is opened in the blade back surface chamber 27, the escape passage 6 can be easily formed, and the liquid refrigerant in the compression chamber X is transferred to the groove 61. The escape passage 6 formed in (3) allows the escape passage 6 to quickly escape to the blade back chamber 27.

According to the fourth aspect of the invention, the blade 5 is formed on the sliding surface 22a of the blade sliding groove 22 for slidably mounting the blade 5 formed in the cylinder 2 with the side surface of the blade 5 on the compression chamber side. Since the escape passage 6 for communicating the compression chamber X with the back chamber 27 of the blade 5 is formed in the vicinity of the most advanced position in the cylinder chamber 21, the cylinder 2 is usually made of casting, Since the material is soft, it is possible to easily form the escape passage 6 in the cylinder 2.

According to the fifth aspect of the invention, a blade 5 is integrally provided on the roller 3 so as to project therefrom.
In a swing-type rotary compressor in which a tip end side of the blade is swingably supported by a blade receiving portion 81 of a support body 8 rotatably disposed in the cylinder 2, A relief passage 6 for communicating the compression chamber X with the back chamber 27 of the blade 5 is provided on the sliding surface 82 of the blade 5 with the side surface on the compression chamber side in the vicinity of the most advanced position of the blade 5 into the cylinder chamber 21. Because it was formed
Even when the liquid refrigerant is sucked into the cylinder chamber 21 and the liquid compression operation is performed, when the blade 5 advances to the vicinity of the most advanced position into the cylinder chamber 21, the sliding of the support body 8 is performed. The escape passage 6 formed on the moving surface 82
Since the compression chamber X and the back chamber 27 are communicated with each other, the escape passage 6 allows the liquid refrigerant or the gas refrigerant mixed with the liquid in the compression chamber X to have a sharp pressure rise before the blade rear surface. It can escape to the chamber 27.

Therefore, even in the oscillating rotary compressor,
Even if the liquid refrigerant flows into the cylinder chamber 21, the liquid refrigerant or the like can be expelled to the blade back chamber 27 promptly from the escape passage 6 before a rapid pressure increase occurs in the compression chamber X. Therefore, it is possible to reliably prevent the blade 5 and other peripheral devices from being damaged, and it is possible to improve reliability.

Moreover, the escape passage 6 can be formed by an extremely simple method such as cutting the sliding surface 82 of the blade receiving portion 81 of the support 8 with the side surface of the blade 5 on the compression chamber side, and , The support 8 which is easy to process
Therefore, it is possible to improve the workability of the blade 5 as compared with the case where the relief passage 6 is formed in the blade 5 integrally protruding from the roller 3.

According to the sixth aspect of the invention, in the oscillating rotary compressor, the back chamber 2 of the blade 5 is
Since 7 is a closed space, during the liquid compression operation, the liquid refrigerant is allowed to escape from the escape passage 6 to the back chamber 27 to prevent the liquid compression.
In the normal operation in which the liquid compression operation is not performed in the cylinder chamber 21, even if the compressed gas in the compression chamber X flows from the escape passage 6 to the back chamber 27, the back chamber 27
Since it is a closed space, it is possible to prevent it from escaping to the outside, and it is possible to prevent a reduction in the capacity of the compressor during normal operation.

Moreover, in the swing type rotary compressor described above, the blade back chamber 27 is connected to the compression chamber X and the low pressure chamber Y via the gap between the support 8 and the blade 5 or the like. Since the rollers 3 communicate with each other, when the roller 3 is about to reach the bottom dead center from the top dead center, the blade 5 follows the roller 3 and is swung while the back chamber 2
7, the rear chamber 27 can be made to have an intermediate pressure higher than the suction chamber Y but lower than the compression chamber X by the negative pressure generated by the movement of the blade 8. When the liquid is sucked into the chamber 21 and the liquid compression operation is performed, the liquid refrigerant released from the compression chamber X via the escape passage 6 is smoothly transferred to the back chamber 27 which is set to an intermediate pressure by the differential pressure. Therefore, it is possible to further prevent the sudden pressure increase in the compression chamber X from occurring.

[0026]

EXAMPLE A rotary compressor according to a first example will be described with reference to FIG. In the rotary compressor shown in FIG. 1, a cylinder chamber 21 is formed in a cylinder 2 housed in a closed casing 1, a roller 3 is rotatably housed in the cylinder chamber 21, and the roller 3 extends from a motor. By inserting the eccentric portion 41 of the drive shaft 4 into the drive shaft 4,
The roller 3 is eccentrically rotated in the cylinder chamber 21 by the eccentric rotation of the eccentric portion 41 due to
A blade sliding groove 22 extending in the radial direction is formed in the cylinder 2, and the blade 5 which is constantly in pressure contact with the outer peripheral surface of the roller 3 in the sliding groove 22 can be slid along with the eccentric rotation of the roller 3. The blade 5 divides the inside of the cylinder chamber 21 into a compression chamber X in which the discharge port 23 is opened and a suction chamber Y in which the suction port 24 is opened.

The discharge port 23 is configured to be opened and closed at a predetermined pressure by a discharge valve 25 provided so as to face the discharge port 23, and the suction port 24 is also provided.
The suction pipe 26 is connected to.

Further, a blade back surface chamber 27 for applying a high pressure in the casing 1 is formed on the back surface of the blade 5 on the radially outer side of the blade sliding groove 22. 27 is formed by a hole penetrating the cylinder 2 in the axial direction, and communicates with a high-pressure chamber in the casing 1.

However, in the rotary compressor described above, in the first embodiment, as shown in FIGS. 1 and 2, one end of the blade 5 is located on the side of the compression chamber and is located inside the cylinder chamber 21 of the blade 5. A groove 61 having a narrow width, which opens in the compression chamber X in the vicinity of the most advanced position and whose other end opens in the blade back chamber 27 and extends in the sliding direction, is provided, and by the groove 61, the cylinder chamber of the blade 5 is formed. The escape passage 6 for connecting the compression chamber X to the blade back chamber 27 is formed near the most advanced position into the blade 21.

That is, the roller 3 is connected to the discharge port 24.
The blade 5 is closest to the blade slide groove 2
2 is completely housed, that is, when the eccentric direction tip of the eccentric portion 41 is directed to the sliding groove 22, the top dead center is defined, and the eccentricity of the drive shaft 4 is determined from the top dead center. The portion 41 is eccentrically rotated by 180 degrees, and the roller 3 is eccentrically rotated by the eccentric rotation of the eccentric portion 41, and the blade 5 enters the cylinder chamber 21 and reaches the most advanced position. Assuming that the bottom dead center is d, the eccentric portion 41 has a predetermined angle Θ (5 to 1
The groove 61 is formed so that the escape passage 6 formed by the groove 61 is opened to the compression chamber X when the eccentric rotation is performed in the range of 5 degrees).

Specifically, the opening 61b of the groove 61 to the blade back surface chamber 27 is made to face the back surface of the blade 5, and, for example, the eccentric portion 41 is located 17 degrees from the top dead center.
The escape passage 6 is formed so that the cylinder chamber side tip portion 61a of the groove 61 starts to open to the compression chamber X when it is eccentrically rotated by 0 degree.
When the top dead center is 0 degree, the eccentric portion 41 is
Within the rotation range when rotating from 0 degree to 190 degrees, the compression chamber X and the blade back chamber 27 during the whole period.
It means that they are communicating with.

If the predetermined angle Θ is within the range of 5 ° to 15 ° in one direction from the bottom dead center d, the relief passage 6 can be opened to the compression chamber X at any rotation angle. Good.

As described above, in the first embodiment, even when the liquid refrigerant is sucked into the cylinder chamber 21 and the liquid compression operation is performed, the blades 5 are connected to the cylinder chamber 2.
When it has advanced to the vicinity of the most advanced position in 1, the relief passage 6 formed in the blade 5 is opened to the compression chamber X, and the relief passage 6 connects the compression chamber X and the blade back chamber 27. Since they can communicate with each other, as shown by the solid line in the graph of FIG.
The liquid refrigerant can be released to the blade back chamber 27 before the pressure inside the compression chamber X rapidly rises due to the liquid compression by the liquid refrigerant inside.

Therefore, even if the liquid refrigerant flows into the cylinder chamber 21, the liquid refrigerant is promptly discharged from the escape passage 6 to the blade rear chamber 27 before the pressure in the compression chamber X rapidly increases. Since it can be released, damage to the blade 5 and other peripheral devices can be reliably prevented, and reliability can be improved. In addition, the drive shaft 4 of the motor and other structures do not need to have a sturdy structure capable of withstanding a sudden pressure rise, and therefore, the weight of the entire compressor can be reduced and the size and weight can be reduced. Of.

Further, in the first embodiment, the escape passage 6 is introduced into the compression chamber X near the most advanced position of the blade 5 into the cylinder chamber 21 on the side surface of the blade 5 on the compression chamber side. Since the groove 61 is opened and the other end is opened to the blade back chamber 27, the escape passage 6 is formed.
Can be easily formed only by forming the groove 61.

Further, the escape passage 6 is provided in the blade 5.
In forming the above, as in the second embodiment shown in FIG. 3, one end of the blade 5 is opened to the compression chamber X in the vicinity of the most advanced position of the blade 5 into the cylinder chamber 21,
The relief passage 6 may be formed to connect the compression chamber X and the blade back chamber 27 by the hole 62 having the other end opening to the blade back chamber 27.

That is, the hole 62 has an opening 62c inside the blade 5 that opens to the back surface of the blade 5, and the first hole 62a is closed at the tip extending in the sliding direction of the blade 5. And communicates with the first hole 62a at its tip, on the side of the blade 5 on the side of the compression chamber, and in the cylinder chamber 21 where the blade 5 is in the vicinity of the most advanced position (as in the first embodiment). The second hole 62b is opened to the compression chamber X when it enters the predetermined angle Θ).

As described above, in the second embodiment, the hole 62 is provided in the blade 5, and the escape passage 6 is formed in the hole 62. Therefore, the escape passage 6 is the same as that in the first embodiment. Compared with the groove 61, the workability of the escape passage 6 is slightly difficult, but as the liquid refrigerant passes through the groove 61 as in the first embodiment, the blade 5 and the blade manual groove 22 Therefore, it is possible to prevent the lubricating oil between and from being reduced by the liquid refrigerant so that the lubricating performance is deteriorated.

Therefore, it is possible to prevent damage to each component due to liquid compression while maintaining the lubricating performance for sliding the blade 5.

In the first and second embodiments, the escape passage 6 is formed in the blade 5, but it may be formed in the cylinder 2 as in the third embodiment shown in FIG. .

That is, on the sliding surface 22a of the blade sliding groove 22 formed in the cylinder 2 with the side surface of the blade 5 on the compression chamber side, the cylinder chamber 21 of the blade 5 is provided.
The compression chamber X in the vicinity of the most advanced position inside the blade 5
To form a relief passage 6 communicating with the back chamber 27, and the relief passage 6 is chamfered on at least one axial side of the sliding surface 22a as shown in FIG. , To form. Further, the escape passage 6 may be formed by forming a narrow groove in the axially intermediate portion of the sliding surface 22a.

As described above, in the third embodiment, the blade sliding groove 22 formed in the cylinder 2 has the sliding surface 22a with the side surface of the blade 5 on the compression chamber side, and the cylinder chamber of the blade 5 is Since the escape passage 6 for communicating the compression chamber X with the back chamber 27 of the blade 5 is formed in the vicinity of the most advanced position into the cylinder 21, the cylinder 2 is usually made of casting and the material is softer than the blade 5. Therefore, the escape passage 6 can be easily formed in the cylinder 2.

Particularly, in the third embodiment, the escape passage 6 is provided.
Is formed by chamfering at the end of the sliding surface 22a in the axial direction, the processing can be performed better.

Next, a fourth embodiment will be described with reference to FIG. A fourth embodiment shown in FIG. 5 is an oscillating rotary compressor in which a cylinder chamber 21 of a cylinder 2 is internally provided with a roller 3 which is fitted into an eccentric portion 41 of the drive shaft 4.
A blade 5 is integrally formed on the outer peripheral portion of the roller 3 so as to project outward in the radial direction, and a semi-circular cylinder having a semicircular cross section is formed inside the cylinder 2 at an intermediate portion between the discharge port 23 and the suction port 24. A pair of left and right first and second members 8
A support 8 composed of A and 8B is rotatably supported, and a protruding end side of the blade 5 can be moved forward and backward to a blade receiving portion 81 formed between the members 8A and 8B of the support 8. The blade 5 is slidably slidable by being inserted into and supported by the roller 3, so that the roller 3 can be compressed while being prevented from rotating.

In the cylinder 2, a blade back surface chamber 27, which is a closed space, is formed on the outer side in the radial direction of the blade receiving portion 81 of the support member 8, and the blade back surface chamber 27 is supported by the blade back surface chamber 27. By communicating with the compression chamber X and the low pressure chamber Y through a gap between the body 8 and the blade 5 or the like, an intermediate pressure between the pressure of the compression chamber X and the pressure of the low pressure chamber Y is obtained. There is.

Further, via the blade 5, the cylinder chamber 21 is divided into a compression chamber X in which a discharge port 23 is opened and a suction chamber Y in which a suction port 24 is opened. A discharge valve 25 that opens and closes the discharge port 23 is provided at a portion facing the discharge port 23, and a suction pipe 26 is connected to the suction port 24.

Therefore, in the fourth embodiment, the support 8
The blade 5 on the surface forming the blade receiving portion 81 of the first member 8A located on the compression chamber X side, that is, the sliding surface 82 that slides on the compression chamber side surface of the blade 5. In the vicinity of the most advanced position in the cylinder chamber 21, the escape passage 6 formed of the groove 63 for communicating the compression chamber X with the back chamber 27 of the blade 5 is formed.

That is, as in the first embodiment described above, when the eccentric portion 41 is eccentrically rotated in the range of a predetermined angle Θ (5 to 15 degrees) from the bottom dead center d to the front and rear in the eccentric rotation direction. In addition, the escape passage 6 forms the groove 63 so that the compression chamber X communicates with the back chamber 27. Specifically, the groove 63 is always opened in the compression chamber X and , The blade 63 so that the eccentric portion 41 is opened from the top dead center to the position of the predetermined angle Θ, for example, in the blade back chamber 27 only when it is eccentrically rotated by 170 degrees from the top dead center. It is formed in the sliding direction.

The support 8 does not necessarily have to be composed of the two first and second members 8A and 8B having a semi-cylindrical shape, but a single support 8 having a cylindrical shape may be used. The receiving portion 81 may be formed inside the middle of the body 8, and the escape passage 6 may be formed on the sliding surface 82 of the receiving portion 81 with the side surface of the blade 5 on the compression chamber side. .

As described above, according to the fourth embodiment, in the above-described oscillating rotary compressor, the blade receiving portion 81 of the support 8 has a sliding surface 82 with the side surface of the blade 5 on the compression chamber side. , The cylinder chamber 2 of the blade 5
Since the escape passage 6 for communicating the compression chamber X with the back chamber 27 of the blade 5 is formed in the vicinity of the most advanced position in 1, the liquid refrigerant is sucked into the cylinder chamber 21 to perform the liquid compression operation. Even when the blade 5 has advanced to the vicinity of the most advanced position into the cylinder chamber 21,
Since the compression chamber X and the back chamber 27 are communicated with each other by the escape passage 6 formed in the sliding surface 82 of the support 8, the escape refrigerant 6 mixes the liquid refrigerant or the liquid in the compression chamber X with the escape passage 6. This gas refrigerant can be released to the blade back chamber 27 before a rapid pressure rise due to liquid compression occurs.

Therefore, even in the swing type rotary compressor,
Even if the liquid refrigerant flows into the cylinder chamber 21, the liquid refrigerant or the like can be expelled to the blade back chamber 27 promptly from the escape passage 6 before a rapid pressure increase occurs in the compression chamber X. Therefore, it is possible to reliably prevent the blade 5 and other peripheral devices from being damaged, and it is possible to improve reliability.

Moreover, the escape passage 6 can be formed by an extremely simple method such as cutting the sliding surface 82 of the blade receiving portion 81 of the support 8 with the side surface of the blade 5 on the compression chamber side, and , The support 8 which is easy to process
Therefore, it is possible to improve the workability of the blade 5 as compared with the case where the relief passage 6 is formed in the blade 5 integrally protruding from the roller 3.

Further, since the back chamber 27 of the blade 5 is a closed space, during the liquid compression operation, the liquid refrigerant is allowed to escape from the escape passage 6 to the back chamber 27 to prevent the liquid compression. During normal operation, that is, during normal operation in which the liquid compression operation is not performed in the cylinder chamber 21, the compressed gas in the compression chamber X is released from the escape passage 6
Even if it flows from the back chamber 27 to the back chamber 27, it is possible to prevent the back chamber 27 from escaping to the outside because the back chamber 27 is a closed space, and it is possible to prevent the capacity of the compressor from being reduced during normal operation.

Moreover, in the above-described swing type rotary compressor, the blade back chamber 27 is connected to the compression chamber X and the low pressure chamber Y via the gap between the support 8 and the blade 5 or the like. Since the blades 5 communicate with each other, when the blade 5 is swung following the rotation of the roller 3 and the roller 3 is about to reach from the top dead center to the bottom dead center, the blade 5
Are moved in a direction of coming out of the back chamber 27, and the back chamber 27 can be made to have an intermediate pressure higher than that of the suction chamber Y but lower than that of the compression chamber X by negative pressure generated by the movement of the blade 8. Therefore, when the liquid is sucked into the cylinder chamber 21 and the liquid compression operation is performed, the liquid refrigerant released from the compression chamber X via the escape passage 6 is
The pressure can be smoothly released to the back chamber 27 which has been made an intermediate pressure by the differential pressure, and it is possible to more favorably prevent the sudden pressure increase in the compression chamber X.

In the oscillating rotary compressor of the fourth embodiment, the escape passage 6 is formed in the sliding surface 82 of the blade receiving portion 81, but in the oscillating rotary compressor, the roller 3 is used. It is also possible to form an escape passage 6 composed of the same groove or hole as in the first and second embodiments on the blade 5 which is integrally provided with the blade 5.

[0056]

According to the invention as set forth in claim 1, an escape passage for communicating the compression chamber X with the blade back chamber 27 in the blade 5 near the most advanced position of the blade 5 into the cylinder chamber 21. 6 is formed, even if the liquid refrigerant flows into the cylinder chamber 21, the liquid refrigerant is swiftly discharged from the escape passage 6 before the rapid pressure increase occurs in the compression chamber X. Therefore, it is possible to prevent a sudden pressure increase in the compression chamber X from occurring, and it is possible to reliably prevent the blade 5 and other peripheral devices from being damaged. Therefore, the reliability can be improved.

In addition, the drive shaft 4 of the motor and other structures do not need to have a sturdy structure capable of withstanding a sudden pressure increase, and therefore the overall weight can be reduced and the size and weight can be reduced. Of.

Further, according to the invention as set forth in claim 2, one end of the escape passage 6 is opened to the compression chamber X in the vicinity of the most advanced position of the blade 5 into the cylinder chamber 21, and the other end thereof is the blade. Since it is formed by the hole 62 opening in the back chamber 27, the lubricating oil for lubricating the sliding surface of the blade 5 does not deteriorate in lubrication performance due to being diluted by the liquid refrigerant, and the liquid in the compression chamber X does not deteriorate. The refrigerant can be quickly released to the blade back chamber 27 by the escape passage 6 formed by the hole 62.

According to the third aspect of the invention, the escape passage 6 is formed on the side surface of the blade 5 on the compression chamber side, and one end of the blade 5 is located near the most advanced position of the blade 5 into the cylinder chamber 21. Since the relief passage 6 can be easily formed, the liquid refrigerant in the compression chamber X can be formed by the groove 61 which is open to the compression chamber X and the other end of which is opened to the blade back chamber 27. The escape passage 6 formed by the groove 61 allows the escape passage 6 to quickly escape to the blade back chamber 27.

Further, according to the invention described in claim 4, in the blade sliding groove 22 for slidably mounting the blade 5 formed in the cylinder 2, the sliding surface 22a with the side surface of the blade 5 on the compression chamber side is formed. Since the escape passage 6 that communicates the compression chamber X with the back chamber 27 of the blade 5 is formed in the vicinity of the most advanced position of the blade 5 into the cylinder chamber 21, the cylinder 2 is normally formed of casting, Since the material is softer than the blade 5, the escape passage 6 can be easily formed in the cylinder 2.

According to the fifth aspect of the present invention, in the swing type rotary compressor, the blade receiving portion 81 of the support 8 has a sliding surface 82 on the side surface of the blade 5 on the compression chamber side. The cylinder chamber 21 of the blade 5
The compression chamber X in the vicinity of the most advanced position inside the blade 5
Since the escape passage 6 communicating with the rear chamber 27 of the cylinder chamber 2 is formed,
Even if the liquid refrigerant flows into 1, the liquid refrigerant and the like can be quickly discharged to the blade back surface chamber 27 from the escape passage 6 before a sudden pressure increase occurs in the compression chamber X. It is possible to reliably prevent the blade 5 and other peripheral devices from being damaged, and it is possible to improve reliability.

Moreover, the escape passage 6 can be formed by an extremely simple method in which the sliding surface 82 of the blade receiving portion 81 of the support 8 with the side surface of the blade 5 on the compression chamber side is subjected to cutting work. , The support 8 which is easy to process
Therefore, it is possible to improve the workability of the blade 5 as compared with the case where the relief passage 6 is formed in the blade 5 integrally protruding from the roller 3.

According to the sixth aspect of the invention, in the oscillating rotary compressor, the back chamber 27 of the blade 5 is a closed space. Therefore, during the liquid compression operation, the liquid refrigerant is allowed to escape through the escape passage 6. From the rear chamber 27 to prevent liquid compression, and during normal operation,
That is, during the normal operation in which the liquid compression operation is not performed in the cylinder chamber 21, even if the compressed gas in the compression chamber X flows from the escape passage 6 to the back chamber 27, the back chamber 27 is closed. Since it is a space, it is possible to prevent it from escaping to the outside, and it is possible to prevent the capacity of the compressor from being reduced during normal operation.

Moreover, in the above swing type rotary compressor, the blade back chamber 27 is connected to the compression chamber X and the low pressure chamber Y via the gap between the support 8 and the blade 5 or the like. Since the rollers 3 communicate with each other, when the roller 3 is about to reach the bottom dead center from the top dead center, the blade 5 follows the roller 3 and is swung while the back chamber 2
7, the rear chamber 27 can be made to have an intermediate pressure higher than the suction chamber Y but lower than the compression chamber X by the negative pressure generated by the movement of the blade 8. When the liquid is sucked into the chamber 21 and the liquid compression operation is performed, the liquid refrigerant released from the compression chamber X via the escape passage 6 is smoothly transferred to the back chamber 27 which is set to an intermediate pressure by the differential pressure. Therefore, it is possible to further prevent the sudden pressure increase in the compression chamber X from occurring.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a roller and a blade are installed in a cylinder in a first embodiment of a rotary compressor of the present invention.

FIG. 2 is a sectional view of the blade in which the escape passage formed of a groove is formed in the first embodiment.

FIG. 3 is a cross-sectional view of a blade having a relief passage formed of holes according to the second embodiment.

FIG. 4 is a sectional view of a rotary compressor showing a state in which a relief passage is formed in a cylinder in a third embodiment.

FIG. 5 is a partial cross-sectional view showing a main part of an oscillating rotary compressor in which a roller in which a blade is integrally formed is incorporated in a cylinder in a fourth embodiment.

FIG. 6 is a graph showing the relationship between the rotation angle of the drive shaft and the internal pressure of the cylinder chamber.

FIG. 7 is a partially cutaway plan view showing a conventional example.

[Explanation of symbols]

 2 Cylinder 21 Cylinder Chamber 22 Blade Sliding Groove 22a Sliding Surface 27 Back Chamber 3 Roller 4 Drive Shaft 41 Eccentric Part 5 Blade 6 Relief Passage 61 Groove 62 Hole 8 Support 81 Blade Receiving Part 82 Sliding Surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Uematsu 3-12, Chikko Shinmachi, Sakai City, Osaka Prefecture Daikin Industries, Ltd. Sakai Factory Co., Ltd. inside the seaside factory (72) Inventor Takewa Obaya 3-12, Chikumin Shinmachi, Sakai City, Osaka Prefecture Address Daikin Industrial Co., Ltd. Sakai Plant inside the seaside factory

Claims (6)

[Claims] 1. A roller (3) having a cylinder chamber (21) formed in a cylinder (2), said roller (3) rotating with the eccentric rotation of an eccentric part (41) of a drive shaft (4) in said cylinder chamber (21). The cylinder chamber (21) and the compression chamber (X).
In a rotary compressor in which a blade (5) which is divided into a suction chamber (Y) and a suction chamber (Y) is slidably installed with the eccentric rotation of the roller (3), the blade (5) has a blade (5) A rotary compressor characterized by forming an escape passage (6) for communicating the compression chamber (X) with the blade back chamber (27) in the vicinity of the most advanced position into the cylinder chamber (21). 2. The blade (5) has one end open to the compression chamber (X) near the most advanced position of the blade (5) into the cylinder chamber (21) and the other end at the blade back chamber (2).
7) is provided with a hole (62) opening to the compression chamber (X).
The rotary compressor according to claim 1, wherein an escape passage (6) is formed to connect the blade back chamber (27) and the blade back chamber (27). 3. A side surface of the blade (5) on the compression chamber side, one end of which is open to the compression chamber (X) near the most advanced position of the blade (5) into the cylinder chamber (21) and the other end of which is open. The rotary according to claim 1, wherein a groove (61) opening to the blade back chamber (27) is provided to form a relief passage (6) that connects the compression chamber (X) and the blade back chamber (27). Compressor. 4. A blade in which a cylinder chamber (21) and a blade (5) for partitioning the cylinder chamber (21) into a compression chamber (X) and a suction chamber (Y) are slidably installed in the cylinder (2). Forming a sliding groove (22), the cylinder chamber (21)
In addition, a rotary having a roller (3) rotating with the eccentric rotation of the eccentric portion (41) of the drive shaft (4) and the blade (5) sliding with the eccentric rotation of the roller (3). In the compressor, a sliding surface (22) of the blade sliding groove (22) with the side surface of the blade (5) on the compression chamber side.
a), the cylinder chamber (21) of the blade (5)
A rotary compressor characterized by forming a relief passage (6) for communicating the compression chamber (X) with the back chamber (27) of the blade (5) near the most advanced position inward. 5. A cylinder chamber (21) of the cylinder (2),
Roller (3) inserted into eccentric part (41) of drive shaft (4)
And a blade (5) for partitioning the cylinder chamber (21) into a compression chamber (X) and a suction chamber (Y) are integrally provided on the roller (3) so as to project from the roller (3). A swing type rotary compressor in which a blade (5) is swingably supported by a blade receiving portion (81) of a support (8) rotatably disposed in the cylinder (2), the support ( 8) on the sliding surface (82) of the blade receiving part (81) with the side surface of the blade (5) facing the compression chamber, near the most advanced position of the blade (5) into the cylinder chamber (21). A rotary compressor characterized by forming an escape passage (6) for communicating the compression chamber (X) with the back chamber (27) of the blade (5). 6. The rotary compressor according to claim 5, wherein the blade rear chamber (27) is a closed space.