JP2004144103A - Enclosed scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the drop of compression efficiency and reliability without getting residual foreign substances within an enclosed vessel into a sliding section. <P>SOLUTION: It becomes possible to prevent foreign substances in a refrigeration cycle from getting into each sliding portion without decreasing the flow rate of refrigerant gas, by providing an oil filter 26 in an oil pumping route through an oil pump 9 that pumps oil to a compressing mechanism 2 via an oil passage 10 from an oil reservoir 11 provided at the bottom of an enclosed vessel 1, or by providing it so as to cover an opening of the oil passage 10, and by making finer meshes of the oil filter than those of an intake filter. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a hermetic scroll compressor used for refrigeration equipment such as an air conditioner and a refrigerator.

Conventional hermetic scroll compressors used in this type of air conditioner include those in which lubricating oil stored in the bottom of a sealed container is sucked up by an oil pump or the like and supplied to a compression mechanism portion, a motor bearing portion, and the like ( For example, see Patent Document 1).

The following describes a conventional hermetic scroll compressor with reference to the drawings.

As shown in FIG. 13, the compression mechanism 2 includes the fixed scroll 2 a, the orbiting scroll 2 b, the frame 3, and the rotating shaft 4 inside the closed container 1. The compression chamber 5 is formed by meshing the fixed scroll 2a and the orbiting scroll 2b that makes a revolving motion with respect to the fixed scroll 2a. The frame 3 is provided with a second bearing 6 at the center, and receives the rotating shaft 4 via an eccentric bearing 7 at the second bearing 6. The rotating shaft 4 has a rotor 8a of the electric motor 8 at a lower portion and an oil pump 9 at an end. The oil pump 9 is connected to an oil reservoir 11 at the bottom of the closed casing 1 via an oil passage 10. The oil passage 10 may be, for example, brazed to the holding plate 12 or inserted into the holding plate 12 provided with a substantially D-shaped hole (not shown) by inserting the oil passage 10 cut into a substantially C shape. It is fixed to the holding plate 12 so that it does not rotate.

The frame 3 is fixed to the fixed scroll 2 a via the spacer 13 with a plurality of bolts 14. Further, the rotating shaft 4 gives orbiting motion to the drive shaft 15 via the eccentric bearing 7, and the orbiting scroll 2b is supported by the frame 3 via the Oldham mechanism 16, so that the orbiting scroll 2b does not rotate with respect to the fixed scroll 2a. Perform a swiveling motion.

The suction pipe 17 penetrates the airtight container 1 and is close to a suction port 18 provided in the frame 3, and a suction filter 19 is provided at a connection portion of the suction pipe 17. The discharge pipe 20 penetrates through the sealed container 1 and is connected to a discharge chamber 22 formed by the upper shell 21 and the fixed scroll 2a. The discharge chamber 22 and the compression chamber 5 are connected by a discharge port 23 provided in the fixed scroll 2a.

The flow of the refrigerant gas and oil in the hermetic scroll compressor configured as described above will be described.

The low-pressure refrigerant gas flowing into the closed container 1 from the suction pipe 17 passes through the suction filter 19, passes through the suction port 18 provided in the frame 3, and is formed by the engagement of the fixed scroll 2a and the orbiting scroll 2b. To the compression chamber 5. As the orbiting scroll 2b orbits with respect to the fixed scroll 2a, the sucked refrigerant gas is compressed and becomes high-pressure refrigerant gas. The high-pressure refrigerant gas passes through the discharge port 23, enters the discharge chamber 22, and is discharged from the discharge pipe 20 to the outside of the closed container 1.

The oil in the oil reservoir 11 is pumped up by the oil pump 9 through the oil passage 10 and reaches each sliding portion through the through hole 24 provided in the rotary shaft 4. After lubricating each sliding portion, the oil is discharged into the closed casing 1 through the oil discharge hole 25, and is returned to the oil reservoir 11 through the cutout 8c provided in the stator 8b of the electric motor 8.
JP-A-07-189944

However, in the above-described configuration, foreign matters such as foreign matters mixed at the time of assembling the compressor and spatters generated during welding of the sealed vessel 1 and remaining at the bottom of the sealed vessel 1 are pumped up by the oil pump 9 through the oil passage 10. In addition, since each sliding part penetrates and is damaged by a foreign substance because it penetrates into each sliding part such as a compression part and a bearing part through the through hole 24, there is a problem that the compression efficiency and reliability are reduced. Was.

Further, foreign matter in the refrigeration cycle (not shown) is removed by the suction filter 19 so as not to enter the closed container 1. Then, the foreign matter adheres to the suction filter 19 and the flow rate of the refrigerant gas decreases, so that the performance of the compressor decreases. Conversely, if the coarse suction filter 19 is provided, the flow rate of the refrigerant gas decreases. However, the foreign matter in the refrigeration cycle flows into the closed container 1, and the foreign matter that has flowed in is pumped up by the oil pump 9 through the oil passage 10 and passes through the through-hole 24 to each of the compression unit and the bearing unit. Since each sliding portion bites and is damaged by foreign matter to enter the sliding portion, there is a problem that the compression efficiency and the reliability are reduced.

An object of the present invention is to solve the problems of the above-described conventional example, and to prevent a reduction in compression efficiency and reliability without foreign matter remaining in a closed container entering into each sliding portion. .

The present invention also aims at securing the reliability of the compressor without reducing the flow rate of oil even if foreign matter adheres to the oil filter 19.

The present invention provides a suction filter at the opening of the suction pipe inside the closed container, and an oil filter in the middle of the oil pumping path by the oil pump to make the mesh of the oil filter finer than the suction filter.

The present invention provides a suction filter at an opening inside a closed container of a suction pipe, an oil filter in the middle of an oil pumping path by an oil pump, and makes the mesh of the oil filter finer than the suction filter, thereby providing a refrigerant gas. Therefore, it is possible to prevent foreign substances in the refrigeration cycle from entering into the respective sliding portions without reducing the flow rate of the compressor, thereby preventing the performance of the compressor and the reduction in compression efficiency and reliability.

The present invention provides a suction filter at an opening inside a closed container of a suction pipe, an oil filter in the middle of an oil pumping path by an oil pump, and makes the mesh of the oil filter finer than the suction filter, thereby providing a refrigerant gas. It is possible to prevent foreign matter in the refrigeration cycle from entering into each sliding portion without reducing the flow rate of the refrigeration cycle.

Hereinafter, a closed scroll compressor according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
1, 5, 6, and 12, the same components as those of the conventional hermetic scroll compressor shown in FIG. 13 are denoted by the same reference numerals for convenience, and description thereof is omitted.

In FIGS. 1 and 2, a holding plate 12 for holding an oil passage 10 is provided at a lower portion of the sealed container 1, and an oil filter 26 is provided on the holding plate 12 so as to cover an inlet portion of the oil passage 10 on the holding plate 12 side. Have been.

Therefore, the oil supplied to the compression mechanism 2 must pass through the oil filter 26, and the foreign matter remaining in the closed container 1 is removed when passing through the oil filter 26.

As a result, no foreign matter enters the compression mechanism 2, so that the compression efficiency and reliability of the compressor do not decrease.

In FIG. 3, reference numeral 26 denotes an oil filter according to one embodiment of the present invention, which is formed of a thin plate provided with a number of small holes.

Therefore, the oil filter 26 can be easily formed and fine foreign matter can be removed, so that foreign matter in the sealed container 1 can be prevented from entering each sliding portion.

As a result, no foreign matter enters the compression mechanism 2, so that the compression efficiency and reliability of the compressor do not decrease.

The oil filter 26 may be formed of a thin plate having a slit-like hole as shown in FIG. In this case, the foreign matter can be removed without reducing the oil flow rate, so that the compression efficiency of the compressor does not decrease. Further, the same effect can be obtained even if the oil filter 26 is made of, for example, a knitted thin wire of stainless steel or the like, or a stainless steel plate or the like extracted in a mesh shape by etching or the like.

に お い て In FIG. 5, reference numeral 27 denotes, for example, an oil flow sensor using a flow sensor. As shown in the drawing, by providing an oil flow sensor 27 at a position downstream of the oil filter 26 in the oil passage 10, it is detected that foreign matter has adhered to the oil filter 26 and the oil flow in the oil pumping path has decreased. be able to.

Fig. 6 shows an example of a refrigeration cycle using this compressor. In the figure, 28 is a condenser, 29 is a throttle mechanism, and 30 is an evaporator.

The refrigerant gas is compressed by the compressor and discharged from the discharge pipe 20 to the outside of the closed vessel 1 as a high-temperature and high-pressure gas refrigerant. This gas refrigerant is liquefied in the condenser 28 and becomes a high-temperature and high-pressure liquid refrigerant, and the throttle mechanism 29 absorbs the surrounding temperature to become a low-temperature and low-pressure liquid refrigerant. This liquid refrigerant becomes low-temperature and low-pressure gas refrigerant in the evaporator 30 and flows into the compressor through the suction pipe 17.

FIG. 7 shows an example of a control example of a compressor using the oil flow sensor 27. First, when a certain amount or more of foreign matter adheres to the oil filter 26, a signal from the oil flow sensor 27 is input to a sensor signal input unit 32 provided in the compressor control unit 31. In accordance with the input signal, for example, the operation of the compressor 34 is stopped by the compressor drive unit 33 for a certain period of time, and the unit waits for the fall of foreign matter. Alternatively, a display device 35 is provided to display the state of foreign matter adhesion. Alternatively, it can be said that the compressor 34 is stopped and the oil pump is reversed by the oil pump reversing means 36 to reverse the oil and remove foreign matter.

結果 As a result, since the compression mechanism 2 can be operated without running out of oil, the reliability of the compressor 34 can be improved.

Note that the oil flow sensor 27 can obtain the same effect even if a pressure sensor or the like is used.

に お い て In FIG. 8, reference numeral 10 denotes an oil passage according to an embodiment of the present invention. As shown in the drawing, by providing the upper oil supply hole 10a in the oil passage 10, even if foreign matter adheres to the oil filter 26 and the supply amount of oil from the inlet of the oil passage 10 decreases, the upper oil supply hole Since the oil can be supplied from 10a and the oil does not run out, the reliability of the compressor can be ensured.

As shown in FIGS. 9A and 9B, by providing the upper oil filter 37, foreign matter of the oil supplied from the upper oil supply hole 10a can be removed, so that the foreign matter enters each sliding portion. And the sliding portions can be prevented from being caught by foreign matter and damaged, so that compression efficiency and reliability can be improved.

Also, as shown in FIG. 10, a pressure operated valve 38 is provided. Normally, since oil is supplied through the oil filter 26, foreign matter is removed by the oil filter 26. When the amount of removed foreign substances increases, the oil filter 26 is clogged, and the amount of oil supplied from the oil filter 26 decreases, the pressure-operated valve 38 operates to supply oil from the upper oil supply hole 10a.

Therefore, the compressor can be operated without running out of oil, and the reliability of the compressor can be ensured.

The same effect can be obtained by using another pressure-operated valve, such as a lift valve, as the pressure-operated valve 38.

In FIGS. 11A and 11B, reference numeral 10 denotes an oil passage according to an embodiment of the present invention. As shown in the drawing, a part of the oil passage 10 is cut out in the vertical direction so as to have a substantially C-shaped cross section, and the upper oil supply port 10b and By providing the lower oil supply port 10c, even if foreign matter adheres to the oil filter 26 provided so as to cover the lower oil supply port 10c and the amount of oil supplied from the lower oil supply port 10c decreases, even if the oil supply amount from the lower oil supply port 10c decreases, Since the oil can be supplied and the oil does not run out, the reliability of the compressor can be ensured. Further, the substantially C-shaped portion at the lower end of the oil passage and the substantially D-shaped hole 39 of the holding plate may be formed to prevent rotation of the oil passage 10, and is particularly provided for foreign matter intrusion. Since there is no need, the number of parts does not increase.

In FIG. 12, the mesh of the oil filter 26 is finer than the mesh of the suction filter 19.

Therefore, large foreign substances in the refrigeration cycle can be removed by the suction filter 19, and small foreign substances can be removed by the oil filter 26. Furthermore, since the suction filter 19 has a coarse mesh and the filter is not blocked by foreign matter, the flow rate of the refrigerant gas does not decrease.

As a result, it is possible to prevent a decrease in the capacity of the compressor, the compression efficiency, and the reliability.

Note that, as shown in FIGS. 5 and 8A, the same effect can be obtained even if the oil filter 26 is provided inside the oil passage 10 or near the opening.

As described above, in the hermetic scroll compressor according to the present invention, by reducing the mesh of the oil filter than the suction filter, without reducing the flow rate of the refrigerant gas, the foreign matter in the refrigeration cycle enters each sliding portion. Can prevent intrusion, the capacity of the compressor and
Since it is possible to prevent a decrease in compression efficiency and reliability, the present invention can be applied to refrigeration equipment such as an air conditioner and a refrigerator.

1 is a sectional view of a hermetic scroll compressor according to an embodiment of the present invention. Sectional view of oil passage in one embodiment of the present invention Front view of an oil filter in one embodiment of the present invention Front view of an oil filter in one embodiment of the present invention 1 is a sectional view of a hermetic scroll compressor according to an embodiment of the present invention. Configuration diagram showing a refrigeration cycle in one embodiment of the present invention 1 is a block diagram of a compressor and a control unit according to an embodiment of the present invention. Sectional view of oil passage in one embodiment of the present invention (A) Cross-sectional view of oil passage in one embodiment of the present invention (b) Cross-sectional view of oil passage in one embodiment of the present invention Sectional view of oil passage in one embodiment of the present invention (A) Cross-sectional view of an oil passage in one embodiment of the present invention (b) Plan view of the oil passage 1 is a sectional view of a hermetic scroll compressor according to an embodiment of the present invention. Sectional view of a conventional hermetic scroll compressor

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism part 2a Fixed scroll 2b Orbiting scroll 4 Rotary shaft 8 Electric motor 8a Rotor 8b Stator 9 Oil pump 10 Oil passage 10a Upper oil hole 10b Upper oil port 10c Lower oil port 11 Oil reservoir 12 Holding plate 15 Drive Shaft 16 Oldham mechanism 17 Suction pipe 19 Suction filter 26 Oil filter 27 Oil flow sensor 28 Condenser 29 Throttle mechanism 30 Evaporator 32 Sensor signal input unit 33 Compressor drive unit 34 Compressor 35 Display device 36 Oil pump reversing means 37 Upper oil Filter 38 Pressure-operated valve 39 Substantially D-shaped hole 40 First bearing

Claims (1)

Inside the closed container, a fixed scroll, a orbiting scroll having a drive shaft and performing orbiting motion with respect to the fixed scroll, an Oldham mechanism for preventing the orbiting scroll from rotating, and supporting the drive shaft at one end. A compression mechanism portion having a first bearing portion to rotate and transmitting an eccentric orbiting motion to the orbiting scroll; and a suction pipe provided through the closed container and supplying a refrigerant to the compression mechanism. An electric motor composed of a rotor and a stator and applying a driving force to the compression mechanism via the rotary shaft, an oil reservoir provided at the bottom of the hermetic container, and an oil passage provided at one end of the rotary shaft. An oil pump for pumping oil from the oil reservoir to the compression mechanism via the oil pump. Middle provided oil filter each look-up path, hermetic scroll compressor, wherein the oil that filter mesh is finer than the suction filter.