JPH0681789A - Horizontal rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the discharge of the oil which lubricates a bearing, gulfed with coolant gas, from being discharged, together with the coolant gas. CONSTITUTION:A hole part 38 set close to the through hole 26 of a crankshaft 25 and a drainage hole 39 at the position eccentric to the outside of the hole part are drilled on a thrust plate 36 installed at the edge part of the subbearing 24 of a compression element, and a packing member 37 which cuts off the communication between a coolant passage and the drainage hole 39 and seals the inside of a valve cover 32 in airtight form is interposed between the valve cover 32 and the thrust plate 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal rotary compressor used in a refrigeration cycle such as an air conditioner.

[0002]

2. Description of the Related Art Conventionally, there is a horizontal rotary compressor of a type in which a crankshaft is formed with a through hole for connecting a motor chamber and a machine chamber, and a discharge pipe attached to the machine chamber side discharges the gas from the case ( For example, JP-A-61-1634
No. 62). In this type of horizontal rotary compressor, the compressed refrigerant gas cools the electric elements of the motor chamber, then is guided to the machine chamber through the through hole of the crankshaft, and is discharged from the discharge pipe provided in the machine chamber. It is designed to be discharged into the refrigeration cycle.

FIG. 3 shows a prior art of this type of horizontal rotary compressor. FIG. 3 is an enlarged cross-sectional view of a sub-bearing side that constitutes a compression element in the mechanical portion of the compressor. The auxiliary bearing 1 supports the shaft end of the crankshaft 2, and the crankshaft 2 is formed with a through hole 3 that connects the machine chamber and the compression chamber. A cover packing 5 is mounted between the valve cover 4 and the end of the auxiliary bearing 1. With this cover packing 5,
The inside of the valve cover 4 is hermetically sealed. On the other hand, the outer surface of the valve cover 4 prevents the through holes 3 from being submerged in oil even if the oil level of the machine chamber rises, and also ensures that the discharge cover 6 keeps the oil level of the machine chamber high. Is attached. Also, this discharge cover 6
Thus, a passage 7 for guiding the refrigerant gas to a discharge pipe (not shown) is formed between the valve cover 4 and the valve cover 4. In addition, the passage 7 and the through hole 3 of the crankshaft 2 are different from each other in the cover packing 5
They communicate with each other through a round hole 8 formed at the center of the. Therefore, as shown by the arrow in the figure, the refrigerant gas is discharged from the discharge pipe through the through hole 3 of the crankshaft 2 through the passage 7 to the outside of the case.

[0004]

In the case where such a conventional discharge cover 6 is mounted, the oil 9 which lubricates the auxiliary bearing 1 is discharged from the drain hole 10 formed in the cover packing 5. It has become. For this reason, there is a drawback that the refrigerant gas passing through the through hole 3 is caught in the refrigerant gas and is discharged together with the refrigerant gas, so that the amount of oil accumulated in the machine chamber is reduced. Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional technology, prevent the oil that has been caught in the refrigerant gas and lubricated the bearings from being discharged together, and the level of the lubricating oil in the machine room can be reduced. (EN) Provided is a horizontal rotary compressor that maintains reliability and improves reliability.

[0005]

In order to achieve the above object, the present invention relates to a penetrating member formed by connecting a compression element and an electric element with a crankshaft in a closed container and forming along the axis of the crankshaft. The hole serves as a refrigerant passage that connects the machine room on the compression element side and the motor room on the electric element side,
A valve cover is provided at the end of the machine chamber, and a discharge cover is provided outside the valve cover to guide the refrigerant from the inside of the discharge cover to the discharge pipe. In the provided thrust plate, a hole facing the through hole and a drain drain hole at a position eccentric to the outside of the hole are drilled, and communication between the refrigerant passage and the drain drain hole is cut off. In addition, a packing member that hermetically seals the inside of the valve cover is interposed between the valve cover and the thrust plate.

[0006]

Since the flow of the oil flowing through the refrigerant passage and the oil flowing through the bearing shaft is separated by the packing member, the oil is prevented from being caught in the refrigerant flow and discharged together. Further, the packing member blocks the communication between the refrigerant passage and the space inside the valve cover, so that the oil existing in the space inside the valve cover mixed with the refrigerant flows through the through hole. Mixing is prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a horizontal rotary type compressor according to the present invention will be described below with reference to the accompanying drawings. Figure 1
At the inside of the closed casing 18, the stator 2
0 and a rotor 21, and a compression element including a cylinder 22, a main bearing 23, and a sub bearing 24 are housed. Further, a through hole 26 is formed in the crankshaft 25 that connects the electric element and the compression element, and the machine room A and the motor room B communicate with each other through the through hole 26. . Inside the cylinder 22, an eccentric crank portion 27 formed on the crankshaft 25, a roller 28 and a blade 2 fitted on the crank portion 27 are fitted.
9 are accommodated. The blade 29 has a blade chamber 30.
It is urged toward the center of the cylinder 22 in the radial direction by the compression spring 31 housed in. Therefore, as the roller 28 eccentrically rotates, the outer peripheral surface of the roller 28 and the cylinder 2
The volume of the compression chamber surrounded by the inner peripheral surface of 2 and the blade 29 is changed, and the refrigerant gas sucked from the suction pipe (not shown) is compressed.

The blade 29 also has a function as an oil supply pump for sending lubricating oil to each sliding portion of the compression element. Therefore, as a passage for the oil sent out from the blade 29, for example, an oil passage 41 extending from the blade chamber 30 to a sliding portion between the roller 28 and the blade 29 is formed in the main bearing 23. Similarly, the auxiliary bearing 2
An oil passage (not shown) that extends to the sliding portion is also formed in 4.

The valve cover 3 is provided outside the auxiliary bearing 24.
2 is mounted, and a space 33 is formed inside the valve cover 32. On the other hand, on the outside of the valve cover 32, a discharge cover 34 is attached from the outer surface of the valve cover 32 so as to open a certain space and cover the through hole 26. A crank is provided between the discharge cover 34 and the valve cover 32. A passage 35 for guiding the refrigerant gas flowing through the through hole 26 of the shaft 25 to the discharge pipe 36 side is formed.

FIG. 2 is an enlarged sectional view showing the periphery of the auxiliary bearing 24. A thrust play 36 for receiving the thrust load of the crankshaft 25 is attached to the shaft end of the auxiliary bearing 24. A packing member 37 is mounted between the thrust plate 36 and the valve cover 32.

In this embodiment, the thrust play 36 is
A ring-shaped member with a crankshaft 25 at the center.
A circular hole 38 having substantially the same diameter as that of the through hole 26 is formed, and oil is eccentric from the center of the circular hole 38 at a position facing the sliding portion between the outer circumference of the crankshaft 25 and the inner circumference of the auxiliary bearing 6. A drain hole 39 for removing the drain is formed.

On the other hand, as shown in FIG. 2, the packing member 37 is a member having a concentrically bent shape, and a round hole 39 having the same diameter as the round hole 38 of the thrust plate 36 is formed at the center thereof. Has been done. With this packing member 37,
Each concentric concavo-convex portion is a sealing surface, and in this embodiment, the innermost and outermost convex portions are at positions d and d, respectively.
′, A and a ′ form a seal portion that presses against the valve cover 32 to keep the inside of the valve cover 32 airtight, and the intermediate convex portion is thrust at the positions b, b′c and c ′. The refrigerant passage and the drain drain hole 39 are pressed against the plate 36.
A seal portion is formed to cut off communication between the two.

In FIG. 2, reference numeral 40 indicates an oil discharge port bored in the valve cover 32.

The present embodiment is constructed as described above, and its operation will be described below.

While the compressor is operating, the cylinder 2
The refrigerant gas compressed in the second compression chamber flows in the gas passage that passes through the main bearing 23, the cylinder 22, and the auxiliary bearing 24, and is guided to the motor chamber B. The refrigerant gas is guided to the machine room A through the through holes 26 of the crankshaft 25 while cooling the electric elements such as the stator 20 and the rotor 21 of the motor room B as shown by the black arrow in FIG. . The flow of the refrigerant gas in the machine room A exits the through hole 26 of the crankshaft 25 and then passes through the passage 35 between the discharge cover 34 and the valve cover 32, as shown by the arrow in FIG.
Through the discharge pipe 36 to the external refrigeration cycle.

On the other hand, the oil in the machine room A flows by the pump action of the reciprocating blade 29 as shown by the white arrow in FIG. 1, and is replenished to the sliding parts such as the main bearing 23 and the sub bearing 24. To be done. Of these, the oil that lubricates the auxiliary bearing 24 is returned to the oil sump from the drain port 39 of the thrust plate 36 through the discharge port 40 of the valve cover 32, as shown in FIG. The packing member 37 presses and seals the thrust plate 36 at the circumferential positions b to b ′ and c to c ′, and the circumferential positions d to d ′ and a to the refrigerant and oil flows. Since it is completely separated because it is pressed against the valve cover 32 and sealed at a ', the oil is not caught in the flow of the refrigerant and is not discharged. Further, the packing member 37 allows the refrigerant passage extending from the through hole 26 to the passage 35 and the valve cover 32.
Since the communication with the inner space 33 is blocked, the oil existing in the space 33 mixed with the refrigerant can be prevented from mixing with the refrigerant flowing through the through hole 26.
In this way, it is possible to prevent a reduction in the amount of oil discharged because the oil is not entrapped in the discharged refrigerant gas, so it is possible to prevent a reduction in the amount of oil discharged, and to maintain the oil level at a constant level and to improve the reliability of the compressor. You can improve your sex.

[0017]

As is apparent from the above description, according to the present invention, the thrust plate provided at the sub-bearing end of the compression element has the hole facing the through hole and the eccentricity outside the hole. A draining hole is formed at a predetermined position, and a packing member for blocking communication between the refrigerant passage and the draining hole and airtightly sealing the inside of the valve cover is provided between the valve cover and the thrust plate. Since it is installed, it is possible to prevent the oil discharged from the drain hole and the oil mixed with the refrigerant inside the valve cover from being discharged together with the refrigerant, maintaining the oil level in the machine room and ensuring reliability. Can be achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment according to the present invention.

FIG. 2 is a cross-sectional view showing the flow of refrigerant and oil in the sub bearing.

FIG. 3 is a cross-sectional view showing the flow of refrigerant and oil in a sub bearing in a conventional horizontal rotary compressor.

[Explanation of symbols]

 20 stator 21 rotor 22 cylinder 23 main bearing 24 auxiliary bearing 25 crankshaft 26 through hole 29 blade 32 valve cover 34 discharge cover 36 discharge pipe 37 packing member 38 hole 39 drain hole

Claims (1)

[Claims] 1. A compression element and an electric element are connected in a closed container by a crankshaft, and a through hole formed along the axis of the crankshaft is connected to a machine room on the compression element side and a motor room on the electric element side. A horizontal rotary compressor in which a valve cover is provided at the end of the machine chamber, a discharge cover is provided outside the valve cover, and the refrigerant is guided from the inside of the discharge cover to the discharge pipe. In the thrust plate provided at the sub-bearing end of the compression element,
A hole facing the through hole and a drain drain hole at a position eccentric to the outside of the hole are provided, and the communication between the refrigerant passage and the drain hole is cut off, and the inside of the valve cover is cut off. A horizontal rotary compressor characterized in that a packing member that hermetically seals is installed between the valve cover and the thrust plate.