JPS61212689A - Horizontal closed type scroll compressor - Google Patents

Abstract

PURPOSE:To enable the reserved quantity of oil for a compressor to increase by forming an auxiliary oil reservoir chamber inside the vessel of the horizontal closed compressor by a division plate having an oil outflow hole at its lower position, and by keeping always the pressure in the auxiliary oil reservoir chamber lower than the discharge pressure. CONSTITUTION:At the side end part in the interior of the vessel of a horizontal closed compressor, an auxiliary oil reservoir chamber 27 is formed by a division plate 26 having an oil outflow hole 29 at its lower position. The auxiliary oil reservoir chamber 27 is formed by a discharge pipe 25 penetrating the division plate, and the pressure in it is always kept at a lower pressure than the discharge pressure by the action of a suction pipe 128 which performs ejector effect. Since the oil outflow hole 29 formed on the division plate 26 is provided in such level as the rotor 3a of an electric motor does not come to contact with oil, the oil agitating loss due to the rotor does not caused, and plenty of oil can be reserved in the auxiliary oil reservoir chamber.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a horizontal closed type square frame used for refrigeration and air conditioning.
The present invention relates to a horizontal hermetic scroll compressor suitable for increasing the oil pressure #i1@9, and particularly for increasing the amount of oil sealed.

[Background of the invention]

Hermetic scroll compressors often employ a vertical system as shown in FIG. That is, as shown in FIG. 7, a scroll compressor section 101t-1 is disposed above and an electric motor section 102 is disposed below inside the closed container 100, and an oil reservoir 103 is formed at the bottom of the closed container 100. It is said that The amount of oil sealed in the oil reservoir 103 is determined by the size of the core oil reservoir 103. The amount of oil sealed is expressed as πpi·H/4, where H is the oil level height and ftD is the inner diameter of the sealed container 100. Therefore, the amount of oil sealed changes in proportion to the oil level height H, but the oil level height H only needs to be less than the motor rotor, and since that height can be secured sufficiently, vertical installation is possible. In a scroll compressor, a sufficient amount of oil can be secured.

However, when the closed container 100 is placed horizontally, as shown in FIG. 8, the cross-sectional area of the oil sump is t-8.
If the length of the airtight container 100 is 'kl', the amount of oil sealed will be S-4. Here, θ=2aM-' (1-2h
/D), it becomes 5-p2(θ-Kari θ)/8. Also, if we set 5t-s when the oil level height h=D, then h/D
The relationship between S/S0 and S/S0 is as shown in FIG. In addition, when placed horizontally, it is necessary to avoid oil agitation loss due to the motor rotor, so the oil level height h must be kept below the lower end of the motor rotor. Therefore, as shown by P in Figure 1,189, as the oil level height decreases, the cross-sectional area S decreases, so unless the length l of the sealed container 100 is increased, the amount of oil sealed must be It is difficult to secure.

On the other hand, as a horizontal compressor, for example,
A rotary compressor with a structure as described in No. 5 is known, but this does not take into account securing the amount of oil sealed.

[Purpose of the invention]

An object of the present invention is to provide a horizontal hermetic scroll compressor in which the amount of oil sealed can be increased without increasing the size of the hermetic container.

(Summary of the Invention) The present invention provides a partition plate in a sealed container, forms an auxiliary oil chamber in the sealed container that is partitioned from a storage chamber for a scroll compressor section and an electric motor section, and provides an auxiliary oil chamber in the sealed container. A communication hole that communicates the oil chamber with the oil sump at the bottom of the sealed container is provided at a position below the lower end surface of the motor rotor, one opening into the discharge gas flow path, and the other opening into the auxiliary oil flow path. A static pressure introduction path is provided that opens above the oil level, and the pressure in the auxiliary oil chamber is lowered using the gas flow velocity of the discharged gas to store excess oil in the auxiliary oil chamber. By always keeping the oil level in the tank at an appropriate level, the amount of oil sealed can be increased without increasing the size of the sealed container.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a horizontal hermetic scroll compressor according to the present invention, and FIG. 2 is a sectional view of a bearing oil supply mechanism in FIG. 1.

In the figure, a scroll compressor s is installed in the closed container 1.
2 and a motor section 3 are housed side by side. Further, an oil reservoir 4 is formed at the bottom of the closed container 1. The scroll compressor section 2 has a fixed scroll 5 and an orbiting scroll 6 that are engaged with each other to form a compression chamber (closed space) 7. The fixed scroll 5 includes an end plate 5a and a spiral wrap 5b standing upright thereon, and has a discharge port 8 at its center and an intake port 9 at its outer periphery. The rotating scroll 6 consists of an end plate 5a, a spiral wrap 6b standing upright thereon, and a boss 6C formed on the opposite wrap surface of the end plate 6a.
It consists of The orbiting scroll 6 is supported by a frame 10, and the fixed scroll 5 is fixed to the frame 10. The frame 10 has a sliding bearing 11 inside.
and roller bearings 12, each of which has a rotating shaft 1
3t-supported. The tip of the rotating shaft 13 is an eccentric shaft 13
a, and the eccentric shaft 13a is inserted into the boss 6C via a swing bearing 141. Also frame 10
The orbiting scroll 6 is supported by an Oldham mechanism 15 such as an Oldham ring and an Oldham key, and the orbiting scroll 6'1 is configured to rotate relative to the fixed scroll 5 while preventing rotation. rotating shelf 1
3 & waterfall is a series of electric motor shafts 16t and electric rotor 3a
is directly connected to

3b is a motor stator.

The oil level in the oil sump 4 is maintained at a level below the lower end of the motor rotor 3a. tube 1
A discharge chamber 18 in which 7 is connected to 1 and a discharge port 8 is open communicates with a motor chamber 20 via a passage 19. In addition, in the oil reservoir 4, the discharge chamber 181111 and the motor chamber 20 side are 1. The fixed scroll 5 and the lower part of the frame 10 are connected to each other through a nine oil passage 21i.

A back pressure chamber 22 surrounded by the end plate 6a of the orbiting scroll 6 and the frame 1o is formed on the back side of the orbiting scroll 6, and a pore (not shown) bored in the end plate 6a is formed in the back pressure chamber 22. By introducing the pressure during compression (intermediate pressure) t through the compressor, a force can be applied to the fixed scroll 5 to press it against the fixed scroll 5.

Inside the rotating shaft 13, there are a sliding bearing 11 and rollers #
) An oil supply passage 23 is provided for supplying lubricating oil to the bearing 12 and the swing bearing 14, and an oil pumping hole 24 is provided in the frame 10, which communicates with the ri oil supply passage 23, the oil passage 21, and 'fr. Then, the pressure inside the closed container 1 (discharge pressure) and the pressure in the back pressure chamber 22 (differential pressure between the intermediate pressure can and the rotating shaft 1
Due to centrifugal force generated by 30 rotations, the oil in the oil reservoir 94 can be pumped up to the oil supply passage 23 through the oil passage 21 and the oil pumping hole 24t, and can be supplied to each bearing.

A discharge pipe 25 attached to the RI sealed container 1 is connected to the M1 cabin 20.

On the other hand, a partition plate 26 is fixedly installed inside the closed container J, so that the inside of the closed container 1! Auxiliary oil chamber 27 separated from the motor chamber 20
is formed. The discharge pipe 25 passes through the partition plate 26 and faces the motor room 20. A predetermined amount of oil is sealed in the auxiliary oil chamber 26, and the discharge pipe 25 is provided with a static pressure introduction hole 28 that opens into the interior of the discharge pipe 25 and above the oil level of the auxiliary oil chamber 26. ing. Furthermore, a communication hole 29 for communicating the auxiliary oil chamber 27 and the oil reservoir 4 is provided in the partition plate 26 at a position below the lower end surface of the motor rotor 3a.

Next, the operation of this embodiment will be explained.

The low-temperature, low-pressure gas is guided from the suction pipe 17 and reaches the suction chamber 9 within the fixed scroll 5. Due to the orbiting motion of the orbiting scroll 6, the gas flowing into the suction chamber 9 gradually reduces the pressure 7 formed by both scrolls and moves to the center, and the gas increases its pressure and flows through the discharge port 8. It is discharged. The high-temperature, high-pressure gas flows into the motor chamber 20 via the discharge chamber 18 and the passage 19. At this time, oil contained in the gas is separated in the motor room 20. The gas from which the oil has been separated is discharged from the discharge pipe 25 to the outside of the machine.

On the other hand, oil supplied to the sliding bearing 11, roller bearing 12, and swing bearing 14 through the oil pumping hole 24 and the oil supply passage 23 is injected into the compression chamber 7 through the back pressure chamber 18, and mixed with the gas being compressed. . The oil discharged into the discharge chamber 18 together with the gas passes through the passage 19 and reaches the motor chamber 20 . On this occasion,
Since the gas flow rate is greatly reduced, most of the oil in the gas is separated and its? '1M is oil? Fall to ImD4.

That is, most of the oil is buried in the closed container 1.

- Next, when the operation is stopped, if the oil level in the auxiliary oil chamber 27 is higher than the oil level in the oil sump 94, the auxiliary oil chamber 2
Due to gravity, the oil in No. 7 flows out to the oil reservoir 94 side through the communication hole 29 of the partition plate 26 until the oil level in the auxiliary oil section 27 and the oil level in Oil reservoir No. 4 become the same height. . When the oil level in the auxiliary oil chamber 27 and the oil level in the oil reservoir 40 are at the same height, the oil level is located above the communication hole 29 and below the lower end surface of the t-motor rotor 3a. When the compressor is started in this state, the static pressure in the static pressure introduction hole 28 decreases due to the flow rate of the gas flowing in the discharge pipe 25, and accordingly, the auxiliary oil chamber 2
The pressure inside 7 also decreases. Therefore, due to the pressure difference between the auxiliary oil chamber 27 and the oil reservoir 4, the oil in the oil reservoir 4 is sucked into the auxiliary oil N27 side through the communication hole 29t, and at the same time the oil level in the oil reservoir 4 decreases, the oil level in the auxiliary oil N27 decreases. The surface rises. This phenomenon continues until the oil level in the oil sump 4 drops to the upper level of the communication hole 29.
When the oil level falls below this level, the gas in the motor chamber 20 flows into the auxiliary oil chamber 27, so that the oil level is maintained near the upper end of the communication hole 29.

Next, the amount of oil flowing out of the IC together with the gas from the discharge pipe 25 becomes larger than the amount of oil flowing in from the suction pipe 17, and when the curved surface of the oil reservoir 40 decreases, gas flows into the auxiliary oil chamber 27 through the communication hole 29. At the same time, the oil in the auxiliary oil chamber 27 flows out to the oil sump 4, keeping the oil level constant.

Therefore, in this embodiment, inside the closed container 1.

Since the auxiliary oil chamber 27 is formed and oil is sealed in the auxiliary oil chamber 27, the amount of oil sealed can be increased without increasing the size of the closed container 1.

When the amount of oil flowing out from the discharge pipe together with the gas increases, the oil in the auxiliary oil chamber 27 can be flowed out to the oil sump 4 and the oil level height t in the oil sump 4 can be kept constant. Not only can oil supply be performed stably, but also oil stirring loss caused by the motor rotor 3a can be reduced.

3 and 4 show modified examples of the static pressure introduction passage, and the example in FIG. 3 has a constriction part 25a provided in the discharge pipe 25, a static pressure introduction hole 28 provided in the constriction part 25aK, The oil suction ability is improved by increasing the flow rate of the discharged gas. In the example shown in FIG. 4, a static pressure introduction pipe 128 is provided in the discharge pipe 25, and the opening end 12 in the discharge pipe of the static pressure introduction pipe 128 is
8.8 is located near the center of the discharge pipe, and the opening end 128a is an inclined surface, with the inclined surface directed toward the downstream side of the gas.

FIG. 5 shows an embodiment of the present invention, in which the discharge pipe 25 is connected to 11
The static pressure introduction pipe 128 shown in FIG. 4 is attached to the discharge pipe 25 of the motor rotor 3a, which is located opposite the center of the end face of the motive rotor 3a.

FIG. 6 also shows another embodiment of the present invention, in which the auxiliary oil chamber 27 is formed on the storage chamber side of the scroll compressor section 2, and one open end of the static pressure introduction pipe 228 is connected to the oil in the auxiliary oil chamber 27. Above the surface,
The other open ends are opened into the passages 19, respectively.

〔Effect of the invention〕

As explained above, according to the present invention, the amount of oil sealed can be increased without increasing the size of the sealed container.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the horizontal hermetic scroll compressor of the present invention, FIG. 2 is a sectional view of the bearing oil supply mechanism in FIG. 1, and FIGS. 5 and 6 are longitudinal sectional views showing other embodiments of the present invention, and FIG. 7 is a longitudinal sectional view of a conventional vertical non-closed scroll presser. , FIG. 8 is a model diagram of an oil sump when the compressor of FIG. 7 is placed horizontally, and FIG. 9 is a diagram showing the relationship between the oil level height and the oil filled cross-sectional area in FIG. 8. 1... Airtight container 2... Scroll compression + J & part 3... Electric motor part 3a... Electric motor rotor 25
... Discharge pipe 26... Partition plate 27...
Auxiliary oil chamber 28...Static pressure introduction hole 29...Communication hole
128゜228... Static pressure introduction pipe. 3rd group of flutes/Zθ $5 group

Claims (1)

[Claims] The scroll compressor section and the electric motor section are housed side by side in a closed container, and an oil reservoir is formed at the bottom of the closed container, while a partition plate is provided inside the closed container, and the scroll compressor section and the electric motor section are stored in the closed container. forming an auxiliary oil chamber separated from storage chambers of the machine section and the electric motor section, and providing a communication hole in the partition plate for communicating the auxiliary oil chamber and the oil reservoir at a position below the lower end surface of the motor rotor; A horizontal hermetic scroll compressor, characterized in that a static pressure introduction passage is provided, one of which opens into the discharge gas flow path, and the other of which opens above the oil level in the auxiliary oil chamber.