JPH01237381A - Lateral compressor - Google Patents

Abstract

PURPOSE:To decrease the discharge amount of lubrication oil at the time of high speed rotation and the pressure loss by partitioning the inside of a case into an electric motor side and a lubrication reserving side, and opening a wide fluid passage at the upper part of this partitioning member. CONSTITUTION:Inside a case 1, an electric motor member 21 and a compressor member 22 are housed, and lubrication oil 13 is reserved. This member 21 is compressed of a stator 19 fixed at the case 1 and a rotor 20 fixed at a shaft 4. The member 22 is on the other hand composed of a roller 7 eccentrically rotates along the inside of a cylinder 2 and a vane 10 and the like for partitioning the inside of the cylinder 2 into a suction chamber and a compression chamber such that the vane 10 slides in a groove 8 while abutting on a roller. A protruding member is formed thereat to partition the inside of the case 1 into an electric motor side 43 and a lubrication oil reserving side 44. Further, on the upper part of the protruding member, a gas passage 41 is formed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a horizontal compressor with a rotating shaft arranged horizontally, which is used for example in an air conditioner. The present invention also relates to a horizontal compressor in which the amount of lubricating oil discharged outside the compressor is small and a sufficient amount of lubricating oil can be stored in a closed container.

[Prior Art] A conventional horizontal compressor is, for example, the one disclosed in Japanese Utility Model Application No. 15459/1983.
As described in Publication No. 2 and Japanese Patent Publication No. 48-33042, a partition plate is provided that divides the inside of the compressor in a direction perpendicular to the rotating shaft, and the oil level height differs across the partition plate. It has become. The purpose of both of these is to facilitate the supply of lubricating oil up to the height of the rotating shaft. It has a movable opening.

Therefore, when the refrigerant gas flows into the gas flow path, the pressure loss causes a pressure difference between the front and back of the partition plate, and due to this pressure difference, the lubricating oil passes through the opening at the bottom of the partition plate to the downstream side of the gas. The lubricating oil level increases as the lubricating oil level moves to the rotating shaft, making it easier to supply lubricating oil to the rotating shaft.

On the other hand, in the latter, a communication port is provided only in the lower part of the partition plate, and the lubricating oil is forced in together with the gas to raise the oil level on the downstream side, making it easier to supply the lubricating oil to the rotating shaft.

[Problems to be Solved by the Invention] In the above-mentioned prior art, in order to supply the lubricating oil stored at the bottom of the closed container to the rotating shaft, consideration is given to raising the oil level on the side leading to the rotating shaft.

However, there is no consideration given to operating the compressor with a wide range of rotational speeds, and when the gas flow rate inside the compressor increases during high-speed rotation, the pressure difference before and after the partition plate becomes too large. In this case, the lubricating oil was sometimes discharged from the compressor together with the gas from the discharge pipe close to the oil surface, or the lubricating oil was agitated and discharged in the form of bubbles. Furthermore, when the gas flow rate increases, pressure loss increases before and after the partition plate, resulting in an increase in compressor input.

The present invention improves the problems of the prior art as described above, and even when the compressor rotational speed increases and the gas flow rate increases, the amount of lubricating oil discharged outside the compressor is reduced, and the compressor The object of the present invention is to provide a horizontal compressor that reduces internal pressure loss and maintains a sufficient amount of lubricating oil in a closed container.

[Means for Solving the Problems] A horizontal compressor according to the present invention for solving the above problems has a structure in which a stator, a stator,
It houses an electric motor section consisting of a rotor, and a compression mechanism section that is directly connected to the electric motor section by a rotating shaft having a crank. A roller that is fitted and eccentrically rotates along the inside of the cylinder, a vane that reciprocates within the vane sliding groove while abutting the roller, and two that serve as a bearing for the rotating shaft and both side walls of the cylinder. an end plate forming a silencer between one of the side plates, and a pump chamber surrounded by the back surface of the vane, the vane sliding groove, and the side plates, and communicating with the suction port. , an oil supply path that communicates the pump chamber with the oil supply portion of the rotating shaft;
The oil supply device is capable of pumping the lubricating oil at the bottom of the closed container to the oil supply portion through the suction port, the pump chamber, and the oil supply path by a pumping action caused by the reciprocating motion of the vane as the rotation shaft rotates. In a horizontal compressor, a partition plate with a wide flow passage opened at the top is provided to divide the inside of the closed container into two parts, the motor part side and the lubricating oil storage part, and the suction port is connected to the partition plate. The lubricating oil reservoir is disposed on the electric motor side, and the oil feed path is provided with an opening that opens into the lubricating oil reservoir.

More specifically, the partition plate divides the inside of the sealed container into the electric motor side and the other side (this is called the lubricating oil reservoir), and is provided perpendicularly to the rotation axis. In the upper part, a flow passage (also referred to as a gas flow passage or a gas communication section) having a cross-sectional area so wide that almost no pressure difference occurs is provided.

[Operation] By the pump action that utilizes the reciprocating motion of the covane, the lubricating oil sucked in from the electric motor part side of the partition plate in the sealed container through the suction port is pumped up to the other lubricating oil reservoir side, and is delivered to the oil supply part of the rotating shaft. In addition to supplying lubricating oil to the shaft hole, lubricating oil can also be stored between the sides of the lubricating oil reservoir. When the lubricating oil can be stored to a predetermined volume or more, it overflows from the opening of the flow path in the upper part of the partition plate toward the electric motor section, and the oil level in the lubricating oil storage section is kept constant. The cross-sectional area of the flow path of the opening at the top of the partition plate is large, and the pressure loss with respect to the gas flow is small, so the influence on the increase in compressor input is extremely small.

[Example] Hereinafter, the present invention will be explained by examples.

1 is a longitudinal sectional view showing a horizontal compressor according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a sectional view in FIG. FIG. 3 is a cross-sectional view of main parts showing details of the oil supply pump.

This horizontal compressor includes an electric motor section 21 that can control the rotational speed, and a shaft 4 that is a rotating shaft in a case 1 that is a closed container.
A compression mechanism section 22 is directly connected to the housing, and lubricating oil 13 is stored at the bottom of the case.

The electric motor section 21 includes a stator 1 fixed to the case 1.
9 and a rotor 20 fitted onto the shaft 4.

The compression mechanism section 22 is fitted into a cylinder 2 (details will be described later) and a crank 3 provided on the shaft 4.
The roller 7 rotates eccentrically along the inside of the roller 7.
The vane 1 reciprocates within the vane sliding groove 8 of the cylinder 2 while in contact with the cylinder 2, and partitions the inside of the cylinder 2 into a suction chamber and a compression chamber.
0, side plates 5 and 6 that serve as side walls that seal the bearing of the shaft 4 and both sides of the 992520, refrigerant gas suction and discharge ports (not shown), and a refueling pump P (details will be described later) related to the refueling device. are doing.

The cylinder 2 is provided with an overhang, which is connected to the case 1.
It is fitted inside with almost no gap, and the internal space of the case 1 is separated from the motor side 43 and the other (because of its function, the lubricating oil reservoir 4
(referred to as 4) and also serves as a partition plate. and,
As shown in FIG. 2, a wide gas flow path 41 is opened at the top of the projecting portion.

The outline of the oil supply pump P is as follows.

A lubricant suction boat 26 is provided on the side plate 5, a lubricant discharge boat 28 is provided on the side plate 6, and the back surface 11 of the vane 10 is provided with a lubricant suction boat 26.
and the vane sliding groove 8 of the cylinder 2, the side plates 5 and 6, and the spring hole 2.
A pump chamber 12 for refueling is provided, surrounded by 3 and 3.

A lubricating oil filler port 33 communicating with the shaft hole 17 of the shaft 4 is bored in the end plate 25 that is fixed to the side surface of the side plate 6 and forms a silencer between the end plate 25 and the side plate 6 .

The end plate 25 also has a lubricating oil reservoir 4 in the case 1 that communicates with the shaft hole 17 from the discharge boat 28, and
Oil feed passage 3 having an outlet 40 relating to an opening opening to 4
2 are connected.

The shaft 4 is bored with a branch hole 18 that communicates with the shaft hole 17 and each oil supply portion of the compression mechanism section 22 .

The suction port 26 and the discharge boat 28 will be further explained with reference to FIG. 3.

The suction port 26 provided on the side plate 5 has a suction piece 38 that forms a tapered flow path 36 with an edge portion 34 having a small diameter on the side where the pump chamber 12 opens and a large diameter portion on the side opening toward the bottom of the case 1. It is attached to the side plate 5, and forms a so-called fluid diode in which the edge portion 34 acts as a resistance depending on the direction of fluid flow, making it easier for fluid to flow in one direction and less likely to flow in the other direction. A space 27 is formed at the outlet of the suction boat 26 equipped with the fluidic diode, and a communication passage 3o that communicates this space 27 with the pump chamber 12 is bored in the side plate 5.

On the other hand, the discharge boat 28 provided on the side plate 6
The side that opens to the pump chamber 1 is the small diameter edge portion 35.
A tapered flow path 37 whose opening side is a large diameter portion is formed, and constitutes a so-called fluid diode. A space 29 is formed at the outlet of the discharge port 28 equipped with a fluid diode, and a communication passage 31 is bored in the side plate 6 to communicate the space 29 with the oil feed passage 32.

The operation of the horizontal compressor configured in this way will be explained.

When the horizontal compressor is operated and the shaft 4 rotates, the roller 7 rotates accordingly, and the vane 10 is pushed by the spring 9 and moves into the vane sliding groove 8 of the cylinder 2 while abutting the tip of the roller 7. make a reciprocating motion. Then, the refrigerant is compressed by changing the volume of the portion surrounded by the cylinder 2, roller 7, and vane 10. Next, the operation of the oil supply pump P will be explained.

When the volume inside the pump chamber 12 is about to increase due to the reciprocating movement of the vane 10, the lubricating oil 13 inside the case 1 is sucked through the suction port 26. At this time, the lubricating oil 13 is also sucked from the discharge port 28 at the same time, but the flow of the lubricating oil expanded in the space 29 contracts at the tip of the discharge port 28, creating a large flow resistance there, making it difficult to flow back.

Therefore, most of the lubricating oil is sucked through the suction port 26.

On the other hand, when the vane 10 descends and the volume inside the pump chamber 12 becomes smaller, lubricating oil is discharged from the discharge port 28 to the oil feed path 32 side. At this time, lubricating oil is simultaneously discharged from the suction port 26, but the flow of lubricating oil expanded in the space 27 constricts at the tip of the suction port 26, creating a large flow resistance there, making it difficult to flow back. Therefore, most of the lubricating oil is discharged from the discharge port 28, and the communication passage 31. It passes through the oil supply path 32 and is lifted up to the height of the lubricating oil supply port 33 provided in the end plate 25. Lubricating oil flows from this lubricating oil supply port 33 into the shaft hole 17 of the shaft 4, and further, the necessary amount of lubricating oil is supplied to the required lubricating portion through the branch hole 18. Further, the remaining lubricating oil flows out from an outlet 40 provided at the upper part of the oil feed path 32. The leaked lubricating oil is stored in a lubricating oil storage portion 44 partitioned by the cylinder 2 which also serves as a partition plate, and the oil level 42 in this portion becomes high. As the lubricating oil continues to flow out from the outlet 40, the oil level 42 reaches the lower end of the gas flow path 41 provided in the cylinder 2, overflows to the motor side 43, and the oil level 42 reaches the lower end of the gas flow path 41 provided in the cylinder 2.
The height of 2 is kept constant.

According to the embodiment described above, there are the following effects.

(2) Sufficient lubricating oil can be stored in the lubricating oil storage portion 44.

@, At this time, the gas flow path 4 of the cylinder 2 which also serves as a partition plate
Even if compressed gas is allowed to flow through 1, the pressure loss there can be kept small, and the effect on compressor input is small.

Since the outflow port 40 provided in the O1 oil feed path 32 is provided at a higher position than the lubricant oil supply port 33 located at the axial center height of the shaft 4, for example, immediately after starting, there is sufficient oil in the lubricant reservoir path 44. If oil is not stored and the oil level 42 is low, the oil feed path 3
Since the lubricating oil sent from 2 is first sent to the shaft hole 17, there is no risk of delay in starting the supply to the bearing portion, etc.

■ Since there is no communication part at the bottom of the cylinder 2, which also serves as a partition plate, even after the compressor is stopped, the oil level remains at the level of the axis 17 of the shaft 4, which is the lowest position in the part where the partition plate communicates. 42
can be kept.

In this embodiment, the discharge pipe 16 is provided on the lubricating oil reservoir 44 side, but since the height of the oil level 42 can be increased without requiring a pressure difference before and after the partition plate, the discharge pipe 16 Even if it is provided on the electric motor section side 43, the same effect can be obtained.

Furthermore, if a refrigerant-resistant seal member is inserted between the cylinder 2 and the case 1, the partition plate effect can be further improved.

Another embodiment will be described.

FIG. 4 is a longitudinal sectional view showing a horizontal compressor according to a second embodiment of the present invention, and FIG. 5 is a sectional view taken along the line BB in FIG. 4.

In each figure, parts with the same reference numerals as in FIGS. 1 and 2 are the same parts as in the previous embodiment, so their explanation will be omitted.

The end plate 25A is formed into a concave shape, and forms a silencer in the space between it and the side plate 6. It extends in the circumferential direction and is provided in close contact with the case 1 with almost no gap, and also serves as a partition plate. The cylinder 2A is fixed to the case 1 via a projecting portion, and has communication passages at the upper and lower portions, so that refrigerant gas and lubricating oil can pass therethrough almost without resistance.

The pipe-shaped oil feed passage 32 is fixed to the end plate 25A and communicates between the space 29 communicating with the discharge boat 28 and the shaft hole 17 of the shaft 4. An outlet 40a is formed in the upper part of the oil feed passage 32 at the height of the axis of the shaft 4 in a direction perpendicular to the pipe bending direction.

In the horizontal compressor configured in this manner, the lubricating oil is sent to the shaft hole 17 of the shaft 4 through the oil feed path 32 by the pumping action caused by the volume change of the pump chamber 12 due to the reciprocating movement of the vane 10. From there, each lubricating part is supplied with oil. The lubricating oil flowing out from the outlet 40a is stored in the lubricating oil reservoir 44 and pushes up the oil level 42. Furthermore, the lubricating oil that flows out overflows from the gas flow path 41 provided at the upper part of the end plate 25A which also serves as a partition plate, thereby keeping the height of the oil level 42 constant.

According to this embodiment, as in the first embodiment, a sufficient amount of lubricating oil can be stored without affecting the flow of refrigerant gas. In addition, the end plate 25A
has a shape that can be press-formed, and this end plate 25A, which also serves as a partition plate, can be easily manufactured.

In addition, the outlet 40a at the upper part of the oil feed path 32 in this embodiment
Although the hole is opened in the horizontal direction, the same effect as in this embodiment can be obtained even if the hole is opened in an upward direction.

However, it is easier to manufacture by drilling horizontally,
Also, considering the pressure distribution in the bent pipe, the outflow speed of lubricating oil can be lowered compared to when it is installed on the outer periphery of the bent pipe (i.e. facing upward), so the force for stirring the stored lubricating oil can be kept small. It has the advantage of being able to

FIG. 6 is a longitudinal sectional view showing a horizontal compressor according to a third embodiment of the present invention, and FIG. 7 is a sectional view taken along the line CC in FIG. 6.

115= In each figure, the same reference numerals as in FIGS. 1 and 2 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

The end plate 25B constitutes a silencer between it and the side plate 6. It extends in the circumferential direction and is provided in close contact with the case 1 with almost no gap, and also serves as a partition plate.

As in the second embodiment, the cylinder 2A has a communicating passageway through which refrigerant gas and lubricating oil pass, at the upper and lower portions thereof.

The oil supply device P' is provided with a communication portion 30 that communicates the space 27 provided in the side plate 6 with the pump chamber 12. A suction piece 26 constituting a fluid diode is fitted so that the small diameter portion opens into this space 27 . space 2
7 and a lubricating oil supply port 33 drilled in the end plate 25B are communicated by an oil feed path 32A consisting of an oil feed portion 6a drilled in a bearing boss portion of the side plate 6 and an oil reservoir 47. An outflow port 4ob that opens into the lubricating oil reservoir 44 is provided at the upper part of the lubricating oil reservoir 44.

Although the horizontal compressor configured in this manner is not provided with a discharge port, it operates as a pump due to the balance between the fluid diode characteristics of the suction boat 26 and the resistance of the oil feed path 32A. That is, during suction when the vane 10 rises and the volume of the pump chamber 12 increases, a large amount of lubricating oil is sucked from the suction boat 26 because the resistance of the suction boat 26 is smaller than the resistance of the oil feed path 32A. On the other hand, during discharge when the vane 10 is lowered and the volume of the pump chamber 12 is reduced, the resistance of the suction boat 26 becomes greater than the resistance of the oil supply path 32A.
The amount of oil discharged to the oil feed path 32A increases. Therefore, considering one rotation, the amount of oil flowing in the forward direction through the oil feed path 32A is greater than the amount of oil in the reverse direction, and this amount is obtained as the amount of oil supplied.

The lubricating oil sent to the oil reservoir 47 is sent from the oil supply port 33 to the shaft hole 17 of the shaft 4, and is further supplied to each lubricating section. Further, the lubricating oil flowing out from the outlet 40b is stored in the lubricating oil reservoir 44 and pushes up the oil level 42. Furthermore, the lubricating oil that flows out overflows from the gas flow path 41 provided at the upper part of the end plate 25B that also serves as a partition plate, and the oil surface 42
maintains a constant height.

According to this embodiment, similar to the first embodiment, a sufficient amount of lubricating oil can be stored without being affected by the flow of refrigerant gas. Furthermore, since the suction boat 26 and the oil feeding section 6a can be integrated into the side plate 6, which is one component, there is an advantage that the structure of the oil supply pump P' can be simplified.

[Effects of the Invention] As described above in detail, according to the present invention, sufficient lubricating oil can be stored while keeping the pressure loss inside the compressor small. Furthermore, since the oil level can be maintained at a predetermined height regardless of the flow of refrigerant gas, it is possible to reduce the amount of lubricating oil carried out of the compressor by the flow of refrigerant gas.

In short, even when the compressor rotation speed increases and the gas flow rate increases, the amount of lubricant discharged outside the compressor is reduced, the pressure loss inside the compressor is reduced, and sufficient lubrication is maintained inside the closed container. It is possible to provide a horizontal compressor in which oil storage is maintained.

[Brief explanation of the drawing]

1 is a longitudinal sectional view showing a horizontal compressor according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a sectional view in FIG. 4 is a longitudinal sectional view showing a horizontal compressor according to a second embodiment of the present invention, and FIG. 5 is a sectional view taken along the line B-B in FIG. 4. 6 is a longitudinal sectional view showing a horizontal compressor according to a third embodiment of the present invention, and FIG. 7 is a sectional view taken along the line CC in FIG. 6. 1...Case, 2,2A...Cylinder, 3...Crank, 4...Shaft, 5,6...Side plate, 12...
・Pump chamber, 13... Lubricating oil, 21... Electric motor section,
22... Compression mechanism section, 25.25A, 25B... End plate, 26... Suction port, 32, 32A... Oil feed path,
40...Outlet, 43...Electric motor side, 44...Lubricating oil reservoir, p, p', oil supply pump.

Claims (1)

[Scope of Claims] 1. An electric motor section consisting of a stator and a rotor, and a compression mechanism section directly connected to the electric motor section by a rotating shaft having a crank are housed in a closed container with lubricating oil stored at the bottom. The compression mechanism includes a cylinder in which a vane sliding groove is bored, a roller that is fitted into the crank of the rotating shaft and rotates eccentrically along the inside of the cylinder, and a roller that rotates eccentrically along the inside of the cylinder while being in contact with the roller. a vane that reciprocates; two side plates that serve as bearings for the rotating shaft and both side walls of the cylinder;
an end plate that forms a silencer with one of the side plates; a pump chamber surrounded by the back surface of the vane, the vane sliding groove, and the side plates and communicated with the suction port; The lubricating oil at the bottom of the closed container is pumped by an oil supply passage that communicates with the oil supply portion of the rotating shaft and a pumping action caused by the reciprocating movement of the vane as the rotating shaft rotates.
In the horizontal compressor, which has the suction port, the pump chamber, and the oil supply device that can force-feed the oil to the oil supply portion through the oil supply path, the inside of the closed container is divided into two parts: a motor side and a lubricating oil reservoir. A partition plate having a wide flow path opened at the top thereof is provided, and the suction port is arranged on the electric motor side of the partition plate,
A horizontal compressor, characterized in that the oil feed path is provided with an opening that opens into the lubricating oil reservoir. 2. The horizontal compressor according to claim 1, wherein the opening of the oil feed path is provided at a height of the axis of the rotating shaft or at a higher position. 3. The horizontal compressor according to claim 1, wherein the peripheral portion of the cylinder is extended until it fits into the closed container, so that the cylinder also serves as a partition plate. 4. The horizontal compressor according to claim 1, wherein the end plate has a peripheral portion extended until it fits into the closed container, so that the end plate also serves as a partition plate.