JPH0144794Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an oil supply mechanism for a horizontal compressor.
A motor is disposed on one side of a horizontal sealed housing, and a compression element consisting of a front head, a rear head, and a cylinder is disposed on the other side, and fluid discharged from the compression element is discharged into the housing and discharged to the outside from an external discharge pipe. This article relates to a powerful oil supply mechanism for a horizontal compressor.

The inventors of the present invention previously devised a horizontal rotary compressor as shown in Fig. 3, which was equipped with an oil supply mechanism that had a simple construction and a large pump head, and filed an application as Utility Model Application No. 57-93387. Briefly explained based on FIG. 3, the horizontal rotary compressor has an oil chamber C that connects an oil supply pipe B, one end of which is inserted into a reservoir oil O, to a rear head A of a compression element.
while providing a drive shaft E for rotating the roller D.
The oil supply passage E ₁ is provided with a longitudinally penetrating oil supply passage E 1 and each oil supply hole E ₂ that extends radially from the oil supply passage _{E 1 and} opens on each sliding surface. The oil supply mechanism is formed by opening into the oil chamber C and connecting to the other end a substantially L-shaped hollow pipe F whose tip extends in the radial direction of the drive shaft E.

Therefore, by utilizing the centrifugal force generated in the hollow pipe F by the rotation of the drive shaft E, oil can be pumped up from the oil supply pipe B and supplied to each sliding surface.

In FIG. 3, G is a gas discharge pipe for discharging compressed gas to the outside of the machine, H is a rotor of motor I, J is a front head, K is a cylinder, and L is a gas suction pipe.

However, according to the above configuration, the drive shaft E is provided with an oil supply passage E ₁ penetrating in the axial direction and the passage.
It is necessary to form an oil supply hole _E2 that opens from _E1 to each sliding surface, and it is also necessary to provide an oil chamber C in the rear head A and an L-shaped hollow pipe F on the outlet side of the oil supply passage _E1 . However, the overall structure is complex and the number of parts is large, resulting in high costs and problems in that it requires a large number of man-hours to assemble the parts and requires a long time to assemble. Further, since the hollow pipe F and the gas discharge pipe G are both open on one side of the motor I, a large amount of oil discharged from the hollow pipe F during refueling becomes a swirling flow. There is a problem in that a large amount of oil flows out of the machine from the gas discharge pipe G, causing oil to rise, and at the same time, there is a problem in that the amount of oil required for lubrication increases to prevent the oil from rising.

The purpose of this invention is to provide an oil chamber at the rear head side entrance of the oil supply passage and fit an L-shaped hollow pipe at the outlet without forming a complicated oil supply passage on the drive shaft. without doing,
By forming passages in the front and rear heads to introduce oil from the oil reservoir in the housing, it is possible to reliably supply the required amount of oil to each oil supply point, simplifying the overall structure and reducing the number of parts. To provide an oil supply mechanism for a horizontal compressor that can reduce the number of parts and assembly steps, and can also prevent oil from rising unnecessarily from an oil reservoir.

The structure of the present invention is that an annular space is provided between the cylinder-side end of the bearing portion of the front head and the rear head and a drive shaft opposite to this end, and the annular space is connected to the cylinder. and an eccentric shaft portion of the drive shaft that fits into the inner peripheral surface of the roller, which is provided adjacent to both sides in the axial direction of a large diameter portion constituting the eccentric shaft portion. The front head and the rear head are provided with an oil introduction passage which communicates with the hollow part formed by the outer peripheral surface of the small diameter part and has one end opening into the oil reservoir part of the housing and the other end opening into the annular cavity. The oil is drawn from the oil sump by the pressure difference between the pressure inside the hollow part and the oil sump of the housing.
The present invention is characterized in that oil can be introduced between the bearing portions of both heads and the drive shaft via oil introduction passages provided in the front and rear heads.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In the figure, reference numeral 1 denotes a horizontal compressor equipped with the oil supply mechanism of the present invention, in which a cylindrical housing main body 11 is fitted with lids 12 on both open ends in the longitudinal direction to form a horizontal closed housing 10. In the housing 10, an oil reservoir 13 is formed at the bottom, and the motor 2 and the compression element 3 are arranged side by side in the horizontal direction, and the housing body 11 has a suction pipe 4 communicating with the compression element 3. An external discharge pipe 5 is also attached to the lid 12 on the motor 2 side.

The motor 2 consists of a stator 21 fixed to the inner wall of the housing 10 and a rotor 22 rotating within the stator 21, and a drive shaft 6 extending laterally is integrally connected to the rotor 22. There is.

The compression element 3 is composed of a cylinder 32 having a roller 31, and a front head 33 and a rear head 34 fixed to both sides of the cylinder 32 in the width direction. The roller 31 is inserted into the drive shaft 6 to be supported by the shaft, and the roller 31 is fitted onto the eccentric shaft portion 7 by making the drive shaft 6 eccentric at a portion corresponding to the cylinder 32 . Then, by eccentrically rotating the roller 31 within the cylinder 32 with the rotation of the drive shaft 6, the gas flows from the suction pipe 4 through the gas suction passage 35 provided in the cylinder 32.
Gas is drawn into the cylinder 32 and compressed, and the compressed gas is discharged into the housing 10 from the discharge passage 36 provided in the front head 33 to circulate inside the motor 2 and to the outside. He is trying to discharge it to the outside from the discharge pipe 5.

By the way, inside the roller 31 installed in the cylinder 32, the eccentric shaft portion 7 of the drive shaft 6
A large diameter portion 71 is formed in the middle in the direction of the drive shaft, and small diameter portions 72, 72 are formed on both sides of the large diameter portion 71, and the large diameter portion 71 is fitted to the roller 31, and the small diameter portions 72, 72 are connected to each other. Hollow portions 37, 37 are formed on both sides of the inner peripheral surface of the roller 31.

Further, in order to make the bearing mechanism smooth between the bearing parts of the front and rear heads 33, 34 that pivotally support the drive shaft 6 and the drive shaft 6, the bearing part The drive shaft 6 is chamfered and the drive shaft 6 is machined to have a small diameter, so that an annular space 8, 8 is formed between the two machined parts. And this annular space 8,8
are gaps 81, 81 between the small diameter portions 72, 72 of the eccentric shaft portion 7 and the front and rear heads 33, 34;
It communicates with the hollow portions 37, 37 of the roller 31 via.

Therefore, in the horizontal compressor 1 formed as described above, the oil supply mechanism of the present invention has an end portion on the cylinder 32 side of the bearing portion of the front head 33 and rear head 34, and a drive shaft 6 opposite to this end. An annular space 8 is provided between the rollers 31 and the annular space 8 is inserted into the cylinder 32.
and the eccentric shaft portion 7 of the drive shaft 6 that fits into the inner peripheral surface of the roller 31, adjacent to both sides in the axial direction of the large diameter portion 71 constituting the eccentric shaft portion 7. It communicates with the hollow parts 37, 37 formed by the outer circumferential surfaces of the small diameter parts 72, 72 provided, and one end opens into the oil reservoir part 13 of the housing 10, and the other end opens into the oil sump part 13 of the housing 10, and the other end opens into the oil reservoir part 13 of the housing 10. An oil introduction passage 9 opening into the annular cavity 8 is provided.

In what is shown in the drawings, the lower sides of the front and rear heads 33, 34 of the compression element 3 are arranged so as to be constantly immersed in the oil stored in the oil reservoir 13, and the oil introduction passages 9, 9 The front and rear heads 33, 34 are opened at one end at a lower surface that is always located in the oil stored in the front and rear heads 33, 34.
A hole is punched upward between the holes, and the other end is connected to the annular cavity 8,
It was opened at 8.

However, in the above configuration, the compressor 1
When the hollow parts 37, 3 of the roller 31 are driven,
7, the internal fluid passes between both side walls of the roller 31 and the front and rear heads 33, 34 and is sucked into the cylinder 32, so that the pressure is reduced, while the inside of the housing 10 is reduced in pressure by the discharged gas. Since the pressure becomes high due to discharge, the hollow portion 37,
37 is at an intermediate pressure that is lower than the internal pressure of the housing 10 and higher than the internal pressure of the cylinder 32.

Thus, at both ends of the oil introduction passages 9, 9, the oil in the oil reservoir 13, one of which communicates with the other, is as follows.
While the pressure is high enough to match the discharge gas pressure, the annular spaces 8, 8, which the other communicates with, communicate with the hollow parts 37, 37 in the roller 31 through the gaps 81, 81, resulting in an intermediate pressure. , a pressure difference, the so-called pump head, will occur between the two ends of the oil introduction passages 9,9.

Therefore, the oil in the oil reservoir 13 is forced into the annular spaces 8, 8 through the oil introduction passages 9, 9, and is then transferred from the annular spaces 8, 8 to the drive shaft 6.
The oil is transported around the drive shaft 6 in the axial direction and is sequentially supplied to each refueling point around the drive shaft 6.

By the way, in order to supply oil to each oil supply point around the drive shaft 6 as described above, it is preferable to form a spiral groove (not shown) on the inner surface of the front and rear heads 33, 34. By setting the cross-sectional area to a size that allows a necessary and sufficient amount of oil to be supplied to each of the oil supply points, it is possible to reliably supply oil without running out of oil.

In the above explanation, the lower sides of the front and rear heads 33, 34 are constructed so as to be immersed in the stored oil at all times, but this can also be applied to a structure in which they are not immersed in the oil at all times. As shown in FIG. 2, the passages 9, 9 form internal passages 91, 91 in the front and rear heads 33, 34, and are pipe members connected in series to the internal passages 91, 91 to communicate with the oil sump 13. This forms external passages 92, 92 consisting of.

As described above, according to the present invention, the hollow portion provided in the front and rear heads is located between the end of the bearing portion on the cylinder side and the drive shaft opposite to this end, and within the roller inside the cylinder. By providing an annular cavity for communication and further providing an oil introduction passage communicating the annular cavity and the oil sump of the housing, the oil pump head is prevented by the pressure difference between the high-pressure oil sump and the intermediate-pressure hollow. As a result, unlike conventional methods, it is not necessary to form a complicated oil supply passage within the drive shaft, and an oil chamber is provided at the rear head side entrance of the oil supply passage, and an L-shaped hollow pipe is installed at the outlet. Oil is forcibly and reliably injected into the annular space by the pump head without having to fit the oil into the annular space, and the required amount of oil is supplied to each oil supply point around the drive shaft without oil leaking. It became possible.

Therefore, the overall structure can be simplified, the number of parts can be reduced, the number of assembly steps can be reduced, and oil leakage can be prevented, so the capacity of the oil sump can be reduced, and the external dimensions of the housing can be made smaller and lighter. , and the amount of stored oil can be reduced.
This makes it extremely economical.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a horizontal compressor according to the present invention, FIG. 2 is an explanatory view showing another embodiment, and FIG. 3 is a partially cross-sectional view showing a conventional example. 10...Horizontal sealed housing, 13...Oil sump, 2...Motor, 3...Compression element, 31...Roller, 32...Cylinder, 33...Front head, 34...Rear head, 37...Hollow Part 5...
...External discharge pipe, 6... Drive shaft, 7... Eccentric shaft section,
71... Large diameter part, 72... Small diameter part, 8... Annular cavity, 9... Oil introduction passage.

Claims (1)

[Scope of utility model registration request] The motor 2 is mounted on one side of the horizontal sealed housing 10.
A compression element 3 consisting of a front head 33, a rear head 34, and a cylinder 32 is disposed on the other side, and the fluid discharged from the compression element 3 is transferred to the housing 10.
This is a oil supply mechanism for a horizontal compressor that discharges oil to the outside from an external discharge pipe 5, and is provided at an end on the cylinder 32 side of the bearing portion of the front head 33 and rear head 34, and an oil supply mechanism opposite to this end. An annular space 8 is provided between the drive shaft 6 and the drive shaft 6, and this annular space 8 is connected to the inner peripheral surface of the roller 31 installed in the cylinder 32, and the drive shaft 6 that fits into the inner peripheral surface of the roller 31. In the eccentric shaft portion 7 of the shaft 6, hollow portions 37, 37 formed by the outer circumferential surfaces of small diameter portions 72, 72 provided adjacent to both sides in the axial direction of the large diameter portion 71 constituting the eccentric shaft portion 7; The front head 33 and the rear head 34 are connected to each other, and one end thereof is opened to the oil reservoir 13 of the housing 10.
An oil supply mechanism for a horizontal compressor, characterized in that an oil introduction passage 9 whose other end opens into the annular space 8 is provided.