JPS6350695A - Rotary compressor - Google Patents

Abstract

PURPOSE:To make it possible to obtain a low pressure casing type rotary compressor which may prevent overheat of sucked gas that causes the cooling capacity to be lowered, by introducing suction gas introduced into a closed casing through a suction pipe, into a cylinder chamber in a compressor part through a through-hole formed in a shaft. CONSTITUTION:The inside of a closed casing 1 is partitioned by a compressor part 5, and an axial through-hole 16 is formed in a shaft 15 coupling a roller 6 in the compressor part 5 with a rotor 4 in a motor part 2. A suction pipe 20 is provided in the closed casing 1 in the part in which the through-hole 16 is in opposite to the motor part 2 side, and a suction hole 19 for introducing gas from the through-hole 16 in the shaft 15 is formed in the compressor part 5. Accordingly, suction gas may be introduced into the compressor part 6 side, being prevented from making contact with the motor part 2, and is subjected to gasliquid separation before it is sucked into the cylinder chamber-through the suction hole 19, thereby it is possible to prevent the cooling capacity from being lowered due to overheat of suction gas.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a rotary compressor that rotates rollers to compress gas.

(Prior Art) In closed rotary compressors used in refrigeration equipment (air conditioners, refrigerators, etc.), refrigerant is conventionally introduced directly into a cylinder chamber and discharged into a closed case.
Thereafter, an in-case high-pressure system is used in which the fluid is discharged to the outside through a discharge pipe.

Specifically, as shown in FIG. 6, an electric motor part b (consisting of a stator C and a rotor d) and a compressor part e (rollers f and blades p are rotatably disposed in a vertically long sealed case a). Main and sub-bearings h are installed on both sides of the cylinder g, and the rotor d of the electric motor part and the roller f of the compressor part e are connected to the shaft.
are connected to each other. In addition to connecting the suction pipe k to the cylinder g, a structure is used in which a discharge valve (not shown) is opened in the closed case a, and the refrigerant compressed in the cylinder chamber is discharged from the discharge valve into the closed case a. After that, it was discharged from the sealed case a to the discharge pipe m.

Incidentally, such an in-case high-pressure type rotary compressor has a drawback that it tends to suck a large amount of liquid refrigerant into the cylinder chamber.

For this reason, in the case high pressure type, an accumulator n is provided on the suction side as shown in FIG.

Therefore, such a case-internal high-pressure type has the problem of being downsized and increasing cost since it is necessary to install an accumulator n.

Therefore, it is conceivable to reduce the pressure inside the sealed case a and eliminate the accumulator.

(Problem to be solved by the invention) However, if left as is, the suction gas would be overheated by the heat of the motor part d, which would impair the refrigerating ability, which is why it has not been realized. .

The present invention was made in view of these problems, and its purpose is to provide a case-low-pressure rotary compressor with high capacity.

[Structure of the Invention] (Means and Effects for Solving Problems) This invention partitions the inside of the sealed case 1 with the compressor section 5, and also separates the roller 6 of the compressor section 5 and the rotor 4 of the electric motor section 2. A through hole 16 is provided in the connecting shaft 15 along the axial direction, and a suction pipe 20 is provided in the sealed case 1 facing the motor section 2 side of the through hole 16. By providing the suction hole 19 to receive the suction gas, the suction gas is guided to the compressor portion 5 side without coming into contact with the heat of the electric motor portion 2, separated into gas and liquid, and then sucked into the cylinder chamber through the suction hole 19.

(Embodiment) This invention will now be described based on a first embodiment shown in FIGS. 1 to 4. Figure 1 shows a horizontal rotary compressor used, for example, in a refrigerator (refrigeration device), where 1 is an oblong sealed case with a reservoir section 1a on the lower side, and 2 is installed on the right side inside the sealed case 1. This is the electric motor part. The electric motor section 2 has a structure in which a stator 3 is attached to the inner surface of the case, and a rotor 4 is rotatably arranged in the inner cavity of the stator 3. A compressor section 5 is installed on the left side of the sealed case 1 adjacent to the electric motor section 2.

To explain the compressor section 5, as shown in FIG. 2, the compressor section 5 includes main bearings 9 on both sides of a cylinder 8 in which a rotatable roller 6 and a movable blade 7 are disposed in a cylinder chamber. A sub-bearing 10 is arranged. Furthermore, a plate-shaped frame 11 having a shape corresponding to the inner cavity shape of the sealed case 1 is arranged at the end of the main bearing 9, and a container-shaped cover 12 (made of thermally conductive material such as plastic) is arranged at the end of the sub-bearing 10. A structure is used in which a number of bolts (of poor quality) are arranged and these bolts are connected to each other with a plurality of bolts 13. A skirt portion 14 formed around the periphery of the frame 11 is attached to the inner surface of the case, and the entire compressor portion 5 is installed while partitioning the inside of the sealed case 1 into left and right parts.

Further, the roller 6 and the rotor 4 of the electric motor section 2 are coaxially connected by a shaft 15 made of a vibrator material and rotatably supported by a main sub-bearing 9.10. In addition,
15a is a crank part (
(a portion that fits with the roller 6). The refrigerant is introduced into the cylinder chamber using a through hole 16 formed inside the shaft 15 along the axial direction, and the compressed refrigerant is directly transferred to the outside using the discharge pipe 17 connected to the cylinder 8. The structure is such that it is discharged to.

That is, the left end of the shaft 15 is connected to the cover 1 on the suction side.
2 so that the opening of the through hole 16 on the compressor section 5 side faces the space A on the left side in the sealed case 1. In addition to providing a hole] 8 in the bottom wall of the cover 12, the sub-bearing 1
0, suction hole 19 in the part corresponding to the suction side of the cylinder chamber
will be established. Furthermore, a structure is used in which a suction pipe 20 is provided in a case part forming a space C where the opening on the motor part 2 side of the through hole 16 faces, and the negative and positive generated in the cylinder chamber
The refrigerant is sucked into the cylinder chamber from the suction pipe 20 through the space C9 through hole 16° space A and the intraocular suction hole 9 in the cover 12. In other words, the structure is such that the refrigerant can be guided into the cylinder chamber after being separated into gas and liquid when passing through the space A and the cover 12. Note that a gas-liquid separation plate 21 supported by the end portion 4a of the rotor 4 is interposed between the suction pipe 20 and the end of the shaft 15, and has a structure that achieves sufficient gas-liquid separation. .

Also, on the discharge side, a valve device 2 is installed inside the main bearing 9.
2 and a discharge muffler 23 are used. Specifically, in the discharge muffler 23, a half-moon-shaped recess 24 is formed on the end face of the main bearing 9 on the motor section 2 side, extending from the blade 7 side to a portion 180' different from the blade 7. A structure is used in which a muffler space is formed in the space between the frame 9 and the flat frame 11. Note that the recessed portion 24 is formed so as to avoid the portion of the bolt 13 . A discharge hole 25 is provided in this recess 24 on the sealing surface near the blade 7.
communicate. On the other hand, in the valve device u22, as shown in FIG. 3, a belt-shaped discharge valve 27 is attached to a valve stopper 26 formed by molding a belt-shaped plate into a substantially U-shape, and an L-shaped pawl 28 and an engagement hole 29 are formed. A combination of these is used. In addition, the structure for receiving the valve device 22 includes a rectangular valve mounting hole 30 on the bottom wall of the recess 24 and on the cylinder mounting surface corresponding to the spring chamber 7a of the blade 7 (the part that accommodates the spring 7b that biases the blade 7). In addition to providing a guide groove in the bottom wall portion of the recess 24 connecting the valve mounting hole 26 and the discharge hole 27, a structure is used. And the combined valve stopper 26. The valve device 22 is mounted in the correct position by pushing the discharge valve 27 through the valve mounting hole 30 along the guide groove (as shown in FIG. 3). The discharge muffler 23 communicates with the discharge pipe 17 through a passage 32 formed in the side portion of the cylinder 8, and the refrigerant compressed by the roller 6 is transferred to the discharge valve 27.
．． The liquid is discharged out of the case through a discharge muffler 231 passage 32 and a discharge pipe 17.

In addition, the lubricating oil 33 in the ura reservoir part 1a is applied to the main bearing 9 in the compressor part 5 by using the flow velocity of the refrigerant flowing through the through hole 16. Cylinder 8. The material is fed to each sliding portion of the roller 6 and shaft 15.

Specifically, oil grooves 34, 35, and 36 that communicate with each other are formed along the axial direction from the shaft sliding motion of the main bearing 9 through the crank portion 15a to the boss portion of the sub-bearing 10, respectively. Then, the sub-bearing 10 side (groove bottom side) of this bottomed linear groove is communicated with the oil reservoir portion 1a through an oil hole 37 formed in the flange portion 10a. Furthermore, in addition to forming a horizontal hole 38 along the radial direction in the shaft portion immediately after the boss end of the main bearing 9, a cap 39 is inserted into the boss end, and a passage inside the cap is formed.
A structure in which the through hole 16 and the oil groove 37 are communicated through the horizontal hole 38 is used, and due to the ejector effect of the suction gas flowing through the through hole 16, the lubricating oil 33 is sucked up from the oil hole 37, and the oil on the outside of the shaft 15 is removed. It is guided to the grooves 34, 35, 36 and fed to each sliding portion (outer peripheral surface of the shaft 15, etc.). However, reference numeral 40 denotes a throttle member (throttle part) installed in the through-hole portion where the horizontal hole 38 opens, for increasing the velocity of the flow flowing inside the pipe.

Note that holes 41 and 41 for oil circulation are provided on the plate surface corresponding to the oil reservoir portion 1a of the frame 11 to communicate the spaces on both sides, so that the lubricating oil 33 can flow. . However, 42... is a notch provided on the outer periphery of the stator 3 which performs the same function.

Next, the operation of the rotary compressor configured as described above will be explained. First, the electric motor section 2 is excited.

As a result, the rotational force is transmitted to the roller 6 through the rotor 4° shaft 15.

Refrigerant is sucked through the suction pipe 20 by the negative pressure generated in the compression stroke of the cylinder chamber. That is, the sucked refrigerant first impinges on the rotating gas-liquid separation plate 21 and is separated into liquid and gas.

Then, the separated refrigerant is sucked into the through hole 16 from the end of the shaft 15 as it is. This causes the refrigerant to flow to the stator 3. It is sent to the compressor section 5 side without being affected by the heat of the rotor 4. Then, the refrigerant flowing out from the through hole 16 impinges on the left side wall of the sealed case 1, where gas-liquid separation is performed again. The refrigerant that has been sufficiently separated into gas components in this way passes through the cover 12 and enters the suction hole 1.
9 to the cylinder chamber, where it is compressed by rollers 4.

It can thus be seen that the suction gas can be guided into the cylinder chamber with almost no temperature rise. Therefore, compression can be performed with high volumetric efficiency, and a large refrigerating capacity can be obtained. Of course, since the pressure inside the sealed case 1 is kept low and the refrigerant is separated into gas and liquid inside, there is no need for an accumulator, which is a hindrance to the structure and cost. However, the gas-liquid separation plate 21 is provided to ensure liquid separation.

On the other hand, the compressed refrigerant is discharged from the discharge hole 25. Discharge valve 27.
Via the discharge muffler 231 passage 32 and the discharge pipe 17,
It is directly discharged from the cylinder chamber to the outside. At this time, the pressure of the discharged gas reaching the discharge muffler 23 is applied as back pressure to the blade 7 from the valve mounting hole 30, so that good compression is achieved.

During compression, the ejector effect of the refrigerant flowing inside the throttle member 40 causes the oil to flow from the oil hole 37 to the oil reservoir 1.
The lubricating oil 33 of a is sucked up to lubricate each part that requires lubrication. That is, the sucked up lubricating oil 33 is
The oil is supplied to each sliding part through each oil groove 34, 35° 36, and the remaining oil is returned to the oil sump 1a from the through hole 16, circulating in a cycle (shown by the broken line in Fig. 1). .

Here, there is a concern that the feeding performance will deteriorate as the oil level of the lubricating oil 33 changes.
41 is provided to maintain the curved surface of the space A where the oil hole 37 is located at a high level at all times, so this does not occur.

That is, the pressures PA and PB in each space A, the space B surrounded by the frame 11, the stator 3, and the rotor 4, and the space C in which the suction pipe 20 is located.

Looking at pc, it is expressed by the relationship PA < PB - Pc (PB and pc are approximately equal due to the notch 42).

Therefore, as the compression operation is carried out, the lubricating oil 33 flows through the holes 41 and 41, making the curved surface of the space A higher. Moreover, since the curved surfaces of the spaces B and C are lowered, the rotor 4 is prevented from interfering with the lubricating oil 33.

In addition, when it is desired to cool the electric motor section 2 with suction gas, a small hole 43 is provided in the plate surface of the frame 11 to communicate the space A and the space B.
A small hole 43 is provided with a bimetal (not shown) to guide a part of the suction gas to the motor section 2 (as shown in FIGS. 1 and 2), and a bimetal (not shown) is provided in the small hole 43 to prevent the motor section 2 from overheating. If there is a risk, the small hole 43 may be opened to allow the suction gas to be led out to the motor section 2.

Further, although the present invention has been applied to a horizontal rotary compressor, it can also be applied to a vertical rotary compressor.

Specifically, a second embodiment as shown in FIG. 5 can be mentioned. That is, the second embodiment employs a cover 12 that covers the end of the shaft 15 and the boss end of the sub-bearing 10 (a structure that directly receives the suction gas from the through hole 16), and has a vertical shape. In addition, the second embodiment uses a structure in which a thrust ring 50 is interposed between the boss end of the main bearing 9 and the end of the rotor 4 opposite thereto, and the oil groove 36 is communicated with the horizontal hole 38. ing. Of course, this structure may be used in the first embodiment described above. However, in FIG. 5, the same components as those in FIG. 1 are given the same reference numerals and their explanations are omitted.

Further, in both the first and second embodiments, the inside of the sealed case 1 is partitioned into the motor section 2 side and the compressor section 5 side by the frame 11, but the main bearing 9, cylinder 8. Alternatively, the outer shape of the sub-bearing 10 may be set to be equal to the inner diameter of the sealed case 1, and this portion may be attached to the inner peripheral surface of the sealed case 1 to partition the inside of the sealed case 1.

In addition, in the first and second embodiments, the gas-liquid separation plate 21 was disposed between the suction pipe 22 and the shaft 15;
2 may be extended so that the tip portion thereof is disposed within the through hole 16. In this way, the suction gas is directly sent to the compressor section 2, so that overheating of the suction gas can be prevented.

[Effects of the Invention] As explained above, according to the present invention, the suction gas is guided to the compressor side through the suction pipe 1 through hole without being overheated by the heat of the electric motor, and the gas is discharged on the compressor side. After liquid separation,
It will be sucked into the cylinder chamber.

As a result, compression can be performed with high volumetric efficiency,
A case-low pressure compressor with high capacity can be realized.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of this invention,
Fig. 1 is a front sectional view showing a case low pressure type rotary compressor, Fig. 2 is a side sectional view taken along the line X-X, and Fig. 3 is a side sectional view showing an enlarged structure around the valve device. Fourth
The figure is an exploded perspective view showing the valve device, FIG. 5 is a front sectional view showing a vertical type rotary compressor according to a second embodiment of the present invention, and FIG. 6 is a front sectional view showing a conventional general rotary compressor. It is a diagram. 1... Sealed case, 1a... Sealed case, 2...
Electric motor section, 5... Compressor section, 8... Cylinder, 9.
・・Main bearing, 10 ・・Sub bearing, 1
DESCRIPTION OF SYMBOLS 1...Frame, 12...Cover, 15...Shaft, 16...Through hole, 17...Discharge pipe, 19...
・Suction hole, 20... Suction pipe, 34, 35. 36...
Oil groove, 37...Oil hole, 38...Horizontal hole, 39...Cap, 40... Throttle member (throttle part), 41... Hole, 50... Thrust ring, C... ·space. Applicant's representative Patent attorney Takehiko Suzue Figure 2 Figure 3a Figure 5

Claims (10)

[Claims] (1) An electric motor section provided in a sealed case, a compressor section installed adjacent to the electric motor section so as to partition the inside of the sealed case, a roller of the compressor section, and a rotor of the electric motor section. a through hole formed along the axial direction in the shaft, and a suction pipe provided in the sealed case forming a space in which openings of the through hole on the motor side face each other. A rotary compressor comprising: a suction hole formed in the compressor section and guiding suction gas from the through hole into a cylinder chamber of the compressor section. (2) The form of partition inside the sealed case is characterized by a plate-shaped frame of the compressor section sized to correspond to the inner cavity of the sealed case, and this is attached to the inner peripheral surface of the sealed case. A rotary compressor according to claim 1. (3) The form of partition inside the sealed case is such that the outer shape of the main bearing, cylinder, or sub-bearing of the compressor section is set to a size that corresponds to the inner cavity of the sealed case, and this is attached to the inner peripheral surface of the sealed case. A rotary compressor according to claim 1, characterized in that: (4) The rotary compressor according to claim 1, wherein the partition part that partitions the inside of the sealed case is provided with holes for oil circulation that communicate the spaces on both sides of the partition part. . (5) The compressor section is located on the outside of the shaft and communicates along the axial direction with an oil reservoir in the sealed case at one end, and the other end communicates with the inner cavity of the through hole from the radial direction for lubrication. The rotary compressor according to claim 1, further comprising an oil groove. (6) The rotary compressor according to claim 5, wherein the inner cavity portion of the through hole in which the oil groove opens is formed with a constriction portion for increasing the flow velocity. (7) The side of the oil groove that communicates with the through hole is formed by covering the boss end of the main bearing of the compressor section with a cap to form a passage along the radial direction. Rotary compressor as described. (8) On the side of the oil groove that communicates with the through hole, a thrust ring is interposed between the boss end of the main bearing of the compressor section and the rotor end of the electric motor section opposite thereto, and a passage along the radial direction is provided. The rotary compressor according to claim 5, characterized in that the rotary compressor is formed by: (9) The rotary compressor according to claim 1, wherein the electric motor section is provided with a gas-liquid separation plate interposed between the suction pipe and the shaft at the end portion of the rotor. (10) The rotary compressor according to claim 1, wherein the shaft is made of pipe material.