JPH0658282A - Horizontal type compressor - Google Patents

Abstract

PURPOSE:To supply oil by sufficiently storing the oil supplied to a slidable part, preventing a motor-driven rotor from being immersed in the lubricating oil. CONSTITUTION:The lower edge opened port of the suction pipe 56 of an oil pump 51 is formed at the position lower than the upper limit oil level height of the lubricating oil on the bottom part inside a sealed housing 8, and an oil reservoir 9 for accommodating the lubricating oil discharged from the oil pump 51 is installed. An oil feeding pipe 91 for the communication between the lubricating oil reservoir 9 and the oil feeding hole 52 of a rotary shaft 5 is installed. Further, when the oilless state allowable time of a slidable part is set T and the discharge flow rate of the oil pump 51 is set to Q, the dead volume D of the oil reservoir 9 is set so as to satisfy the condition: D<=TXQ.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal compressor.

[0002]

2. Description of the Related Art FIG. 2 is a vertical sectional view of a conventional horizontal scroll compressor. The inside of the closed housing 8 is partitioned into a high pressure side 44 and a low pressure side 45 by a discharge cover 31. Inside the low-pressure side 45, a scroll-type compression mechanism C is arranged in the front, and an electric motor M is arranged in the rear,
These are interlockingly connected to each other via a rotary shaft 5. The electric motor M includes a rotor Ma and a stator Mb. The rotor Ma is fixed to the rotating shaft 5 and the stator Mb is fixed to the hermetically sealed housing 8.

The scroll-type compression mechanism C allows the orbiting orbiting motion of the fixed scroll 1, the orbiting scroll 2 and the orbiting scroll 2, but the rotation preventing mechanism 3 such as an Oldham link for preventing its rotation, the fixed scroll 1 and the electric motor M.
A frame 6 to which is fastened, a front bearing 71 and a rear bearing 72 that pivotally support the rotary shaft 5, and the like.

The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11.
A discharge port 13 is provided in the central portion of the. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 provided upright on the inner surface of the end plate 21, and a drive bush 54 is freely rotatable in a boss 23 provided on the outer surface of the end plate 21 via an orbiting bearing 73. An eccentric pin 53 protruding from the end of the rotary shaft 5 is rotatably fitted into a hole 55 formed in the drive bush 54. A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance and engaging them with each other while shifting the angle by 180 degrees.

An oil pump 51 is provided at the end of the rotary shaft 5, and a suction pipe 56 of the oil pump 51 extends to the lower portion in the hermetically sealed housing 8, and a discharge port (not shown) of the pump is the rotary shaft 5. It communicates with the oil supply hole 52 formed in the.

By driving the electric motor M, the orbiting scroll 2 is driven by a revolving orbiting mechanism including a rotating shaft 5, an eccentric pin 53, a drive bush 54, a boss 23, etc., and the orbiting scroll 2 is rotated by a rotation preventing mechanism 3. While being prevented from rotating, it makes an orbiting motion on a circular orbit with an orbiting radius. Then, the gas enters the low pressure side 45 through the suction pipe 82, and this gas passes through the passage 61 and the low pressure chamber 43.
After passing through, the air is sucked into the closed space 24. Then, as the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, and the check valve 17 is pushed open from the discharge port 13 to open the high pressure chamber 42 from the high pressure side 44. Then, it is discharged from there through the discharge pipe 83.

At the same time, the lubricating oil stored in the lower portion of the closed housing 8 is sucked up by the oil pump 51 from the suction pipe 56, passes through the oil supply hole 52, and is passed through the rear bearing 72, the front bearing 71, the eccentric pin 53, and the swirl. After being supplied to the sliding parts such as the bearings 73 and lubricating them, they fall from the oil drain passage 62 and are stored in the lower part of the hermetic housing 8.

[0008]

In the above-mentioned conventional horizontal hermetic compressor, when a sufficient amount of lubricating oil is enclosed in the hermetic housing 8, the oil level becomes high and the rotor Ma is easily dipped. Since the rotor Ma scoops up the lubricating oil, the power is wasted and the splash of the lubricating oil is entrained in the gas sucked into the sealed housing 8 and sucked into the sealed space 24. (Which means the amount of lubricating oil contained in) increases. On the other hand, if the amount of lubricating oil enclosed is reduced in order to avoid the above problem, there is a risk of poor lubrication of the sliding portion when the amount of lubricating oil in the hermetically sealed housing 8 fluctuates, resulting in a lack of reliability.

An object of the present invention is to provide a horizontal hermetic compressor which can prevent the electric motor rotor from being immersed in lubricating oil and can sufficiently store and supply a sufficient amount of lubricating oil to be supplied to the sliding portion. .

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and is stored in the bottom of the housing through an intake pipe of the oil pump which extends to a lower part in the closed housing by the oil pump. In the horizontal compressor configured to suck in the lubricating oil and deliver the lubricating oil to a sliding portion such as a compression mechanism built in the housing via an oil supply hole formed in the rotary shaft, The lower end opening of the suction pipe of the oil pump is provided at a position not higher than the upper limit oil level of the lubricating oil in the bottom portion of the closed housing, and an oil sump for storing the lubricating oil discharged from the oil pump is provided. When an oil supply pipe that connects the reservoir to the oil supply hole of the rotary shaft is provided, and the oil-free allowable time of the sliding portion is T and the discharge flow rate of the oil pump is Q, the dead volume of the oil reservoir is D is D ≦ T × Q It relates horizontal compressor, characterized in that set so as to satisfy the that condition.

[0011]

As a result of taking the above means, the present invention has the following effects. That is, when the lubricating oil stored in the lower part of the closed housing exceeds the upper limit of the oil level, it is sucked up by the oil pump through the opening of the suction pipe and sent to the oil reservoir to be stored therein. Lubricating oil contained in the oil sump is supplied to a sliding portion such as a compression mechanism through the oil supply pipe and the oil supply hole based on the head difference. As a result, a sufficient amount of lubricating oil can be stored in the oil sump, the amount of oil supplied to the sliding portion can be secured, and the oil level in the lower part of the closed housing is always close to the lower end opening of the suction port, that is, The oil level can be maintained below the upper limit of the oil level, and the situation where the rotor of the electric motor is immersed in the lubricating oil can be avoided.

Also, even when there is no or little lubricating oil in the oil sump, such as when starting up, the oil level in the oil sump rises above the dead volume within the oil-free permissible time. It is possible to quickly lubricate the sliding portion.

[0013]

1 is a vertical sectional view of a scroll type compressor according to an embodiment of the present invention. In the figure, 9 is an oil reservoir provided inside the horizontal housing 8 and 57 is a discharge port of the oil pump 51, which is opened in the oil reservoir. 91 is an oil supply hole 52 of the rotary shaft 5.
Is an oil supply pipe that communicates with the oil reservoir, which also opens in the oil reservoir. Reference numeral 56 denotes a suction pipe of the oil pump 51, which extends to a lower portion in the closed housing, and the opening at the tip thereof is an upper limit oil that is an allowable limit for avoiding a situation in which the rotor Ma is immersed in lubricating oil. It is located below the surface height H1. In this example, it is provided so as to coincide with the upper limit oil level height H1. The configuration other than the above is the same as that of the conventional technique (FIG. 2), and the corresponding portions are denoted by the same reference numerals and the description thereof will be omitted.

The position of the oil reservoir 9 in the height direction is set so that the oil surface thereof has a predetermined head difference Δh in relation to the oil supply hole 52 of the rotary shaft 5, and the capacity V of the oil reservoir 9 is set.
Is determined as follows. That is, when the amount of lubricating oil initially enclosed in the compressor is V0 and the amount of lubricating oil stored in the closed housing 8 at the upper limit oil level height H1 is V1, the capacity V is V≥V0-V1. It is set to meet the conditions. Further, the lower portion of the oil sump 9 is formed to have a narrow width, and the dead volume D thereof, that is, the capacity corresponding to the lower portion of the oil supply hole 52, is the oilless permissible time of the sliding portion T,
When the discharge flow rate per unit time of the oil pump 51 is Q, it is set to satisfy the condition of D ≦ T × Q.

Here, the oilless permissible time of the sliding portion means a time which is a limit for avoiding a situation such as seizure due to suspension of lubrication of the sliding portion, and the capacity of the compressor and the sliding portion. Although it depends on the form, it takes about 1 minute to start applying a load to the bearing due to a pressure difference of high and low pressures after starting.

In the present apparatus, when the lubricating oil stored in the lower part of the closed housing 8 exceeds the upper limit oil level height H1, it is sucked up by the oil pump 51 from the suction port 56 and discharged from the discharge port 57 by the oil sump. Sent within 9. The lubricating oil contained in the oil sump 9 is supplied to the oil supply hole 52 via the oil supply pipe 91 by the head difference Δh, and the rear bearing 72, the front bearing 71, the eccentric pin 53, the slewing bearing are passed through the oil supply hole 52. After being supplied to sliding parts such as 73 and lubricating them,
It falls from the oil drain passage 62 and returns to the lower part inside the closed housing 8.

In this way, by selecting the oil pump 51 whose discharge flow rate is equal to or greater than the amount of oil supplied from the oil reservoir 9 to the sliding portion, a sufficient amount of lubrication is provided in the oil reservoir 9. As a result, oil can be accommodated, and as a result, the amount of oil supplied to the sliding portion can be secured, lubrication failure of the sliding portion can be prevented, and the oil level in the lower portion of the sealed housing 8 is always near the tip of the suction port 56. That is, the upper limit oil level height H1 can be maintained,
It is possible to avoid the situation in which the rotor Ma of the electric motor M is immersed in the lubricating oil, and to prevent waste of power and
The amount of oil rise can be reduced.

Further, the dead volume D of the oil reservoir 9 is set so as to be D ≦ T × Q in consideration of the oilless permissible time T of the sliding portion and the discharge flow rate Q of the oil pump. As described above, even when there is no or little lubricating oil in the oil reservoir 9, the oil level of the oil reservoir 9 rises beyond the dead volume D within the oilless allowable time T.
It is possible to quickly supply oil to the sliding parts and prevent poor lubrication at startup.

[0019]

In the horizontal compressor of the present invention, the lower end opening of the suction pipe of the oil pump is provided at a position not higher than the upper limit oil level of the lubricating oil at the bottom of the closed housing, and the lubrication discharged from the oil pump is carried out. An oil sump for storing oil is provided, and an oil supply pipe for communicating the oil sump with the oil supply hole of the rotary shaft is provided. Further, an allowable oil-free time of the sliding portion is T, and a discharge flow rate of the oil pump. Is set to Q, the dead volume D of the oil reservoir is set so as to satisfy the condition of D ≦ T × Q. Therefore, the electric motor rotor should not be immersed in the lubricating oil and should be moved to the sliding portion. A sufficient amount of lubricating oil to be supplied can be stored and supplied.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a horizontal compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional horizontal compressor.

[Explanation of symbols]

 5 rotating shaft 8 hermetic housing 9 oil reservoir 51 oil pump 52 oil supply hole 56 suction pipe 57 discharge port 53 eccentric pin 71 front bearing 72 rear bearing 73 swivel bearing 91 oil supply pipe C compression mechanism

[Procedure amendment]

[Submission date] September 17, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Claims] 1. A lubricating oil stored in the bottom of the housing is sucked through a suction pipe of the oil pump which extends to a lower part in a closed housing by an oil pump, and the lubricating oil is bored in a rotary shaft. In a horizontal compressor configured to feed through a lubrication hole to a sliding portion such as a compression mechanism built in the same housing, a lower end opening of a suction pipe of the oil pump is connected to a lubricating oil in a bottom portion of the closed housing. Is provided at a position not higher than the upper limit oil surface height of the oil pump, an oil reservoir for containing the lubricating oil discharged from the oil pump is provided, and an oil supply pipe that connects the oil reservoir and the oil supply hole of the rotary shaft is provided. Further, letting T be the oil-free allowable time of the sliding portion and Q be the discharge flow rate of the oil pump, the dead volume D of the oil reservoir is
Is set so as to satisfy the condition of D ≦ T × Q.