JPH03236569A - Accumulator for two-cylinder compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Industrial Application Field) The present invention provides a compressor which is connected to a two-cylinder type compressor which is disposed, for example, in a refrigeration cycle and has two cylinders arranged one above the other. The gas refrigerant and oil that have flowed into the tank are
This invention relates to an accumulator for a two-cylinder compressor that feeds into two cylinders.

(Prior Art) For example, as an accumulator 1 that supplies gas refrigerant or oil to a compressor A such as a rotary 2 constituting a refrigeration cycle,
The one shown in FIG. 2 is known. That is, this accumulator 1 is arranged on the suction side of a two-cylinder compressor A, and once introduces gas refrigerant sent from an evaporator (not shown) into a tank 2 as shown by an arrow B.

The accumulator 1 supplies the gas refrigerant to two cylinders 5.6 disposed above and below within the compressor A through two outlet pipes 3.4, both of which are inserted into one tank 2.
Supplied separately.

Furthermore, the accumulator 1 has, for example, a perfectly circular return hole 7.8 opened at the portion of the outlet pipe 3.4 inserted into the tank 2, respectively. The oil return hole 7.8 of the accumulator 1 is located at the bottom 9 of the tank 2. The accumulator 1 stores oil (not shown) discharged from the compressor A together with the refrigerant gas and circulated through the refrigeration cycle in the bottom 9 of the tank 2 and separates it from the refrigerant gas, and then stores the oil (not shown) in the bottom 9 of the tank 2 and separates it from the refrigerant gas. 8 to outlet pipe 3.
4 and returned to the compressor A.

Further, the accumulator 1 is configured to temporarily store liquid refrigerant in the tank 2 when liquid refrigerant is sent out from the evaporator without being evaporated.

(Problem to be Solved by the Invention) Incidentally, the accumulator 1 as described above introduces the oil accumulated in the tank 2 into the outlet pipe 3.4 from the ura return hole 7.8 and supplies it to the compressor A. , prevents the lubricating oil 10 in the compressor A from running out.

However, in the conventional accumulator 1, the liquid refrigerant that has flowed into the tank 2 may be sent together with oil into the casing 11 of the compressor A and the cylinder 5.6 through the return hole 7.8. Then, the casing 11, the cylinder 5.6, the lubricating oil 10, etc. stored in the casing 11 may be cooled by the sent liquid refrigerant, resulting in a decrease in temperature.

Furthermore, when the high-pressure gas refrigerant compressed and discharged into the casing 11 comes into contact with the lubricating oil 1o whose temperature has decreased, the temperature of the gas refrigerant drops below the saturation temperature, and the gas refrigerant sometimes liquefies. . In such a case, the resulting liquid refrigerant may mix into the lubricating oil 1o, diluting the lubricating oil 1o and significantly reducing its lubricating properties.

As a result, the sliding portions of the compressor A may suffer from seizing or galling defects.

An object of the present invention is to provide an accumulator that prevents lubricating oil in a compressor from being cooled by liquid refrigerant flowing into it and does not reduce the lubricating properties of the lubricating oil in the compressor. be.

[Structure of the Invention] (Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides two cylinders, upper and lower, from one tank into which gas/6 medium and oil are introduced. In an accumulator for a two-cylinder compressor that supplies gas refrigerant and oil to a two-cylinder compressor with a lower cylinder immersed in lubricating oil, the first cylinder is connected to the upper cylinder of the two cylinders. and a second outlet pipe connected to the lower cylinder, the first and second Okayama outlet pipes are inserted into the tank and protrude upward within the tank, and the first outlet pipe is connected to the lower cylinder. The pipe is provided with a first oil return hole located within the tank, and the second outlet pipe is provided with a second oil return hole located at a higher location within the tank than the first oil return hole. .

The purpose is to prevent the lubricating oil in the compressor from being cooled by the liquid refrigerant, thereby preventing the lubricating properties of the lubricating oil from deteriorating.

(Example) An embodiment of the present invention will be described below with reference to FIG.

Components that are the same as those described in the prior art section are given the same numerals and their explanations will be omitted.

FIG. 1 shows an embodiment of the present invention. In the figure, A is a compressor constituting a refrigeration cycle, and 21 is an accumulator provided in the refrigeration cycle and disposed on the suction side of the compressor A.

Among these, the compressor A is of a rotary type and has two cylinders 5.6 in a closed casing 11.

Then, compressor A connects this cylinder 5.6 to casing 1.
The cylinder 5.
6 are arranged horizontally and concentrically vertically.

The compressor A also has a crankshaft 22 that extends vertically within the casing 11, and the lower portion of this crankshaft 22 passes through two cylinders 5.6, and the crankshaft 22 is cylinder 5
．． It is supported via bearing members 23, 24 fixed to 6. The compressor A rotates the crankshaft 22 around its axis, compresses the gas refrigerant supplied to the inside of the cylinder 5.6, and transfers the high-pressure gas refrigerant to the casing 11.
It is designed to be discharged into the

Furthermore, the compressor A is supplied with lubricating oil 10, and this lubricating oil 10 is stored at the bottom of the casing 11. The amount of the lubricating oil 10 in the compressor A is set so that the oil level 10a substantially matches the upper surface of the lower cylinder 6 and substantially the entire lower cylinder 6 is immersed therein.

The compressor A also has lubricating oil 10 of the crankshaft 22.
T immersed in water: has an oil pump 25 inside the end. As the crankshaft 22 rotates, the lubricating oil 10 is pumped up into the crankshaft 22 and distributed within the casing 11, thereby supplying the lubricating oil 1o to each sliding portion.

The accumulator 21 has a tank 26 in the form of an airtight cylindrical container, and both axial ends of the tank 26, that is, the upper end and the lower end, are formed into a convex hemispherical shape. There is. Then, the accumulator 21 is connected to the tank 2
An artificial tube 27 is connected to the upper end of the artificial tube 27.
The discharge port 27a is located approximately on the axis of the tank 26.

The accumulator 21 blows out refrigerant gas sent from an evaporator (not shown) and oil mixed with the refrigerant gas into the tank 26 through the inlet pipe 27 as shown by arrow B. It has become.

Further, the accumulator 21 is provided with two outlet pipes 28, a first and a second outlet pipe.

Both Okayama port pipes 28.2 are inserted into the tank 26 from below, and the portions that enter the tank 26 extend linearly approximately parallel to the axis of the tank 26. Furthermore, the Okayama mouth pipe 28.29 has its suction port 28 a% 29
a are located at the same height as each other, and each suction port': 28a% 29a is connected to the above-mentioned pipe 27.
The discharge port 27a is opposed to the discharge port 27a.

A mesh-like filter 30 placed above the tank 26 and fixed to the inner wall of the tank 26 is interposed between the Okayama auxiliary pipe 28.2 and the artificial pipe 26, so that the discharge from the artificial pipe 27 is The refrigerant gas that has passed through the filter 30 is sucked into its interior.

Further, the Okayama port pipes 28.2 extend the outwardly projecting portions of the tank 26 horizontally and parallel to each other, and are inserted into the casing 11 of the compressor A. The Okayama mouth W28, 29 connects the first outlet pipe 27 to the first cylinder 7 with the first outlet pipe 27 located on the upper side. Further, a second outlet pipe 29 is located below and connected to the second cylinder 8. And the Okayama mouth pipe 28.29 is the tank 26
The refrigerant gas sucked inside is led to the compressor A, and is sent independently to both the upper and lower cylinders 5.6.

Furthermore, the first outlet pipe 28 has a first opening having a perfect circular shape.
An oil return hole 31 is provided. This first oil return hole 3] is located in the bottom 32 of the tank 26, and is arranged near the bottom 32a of the tank 26. This first oil return hole 31 is connected to the bottom 32 of the tank 26.
The oil and the like accumulated in the first outlet pipe 28 are allowed to pass therethrough and flow into the first outlet pipe 28. Here, the first ura return hole 31
The diameter is set to 1.5 mm, for example.

Further, the two second outlet pipes have the first oil return hole 31.
A second ura return hole 33 is provided which is set in a perfect circular shape and has a diameter smaller than that of the second ura return hole 33 . This second oil return hole 33 is connected to the tank 26.
It is arranged at a higher position than the first oil return hole 31 inside the oil return hole 31 . The height difference C between the second ura return hole 33 and the first ura return hole 31 is set to, for example, 20 mm.

Here, the diameter of the second oil return hole 33 may be set to a value equivalent to that of the first recessed hole 31.

That is, in such an accumulator 21, the second oil return hole 31 is arranged above the first oil return hole 33, and the opening area of the first oil return hole 31 is made larger than the second oil return hole 33. Since it is set larger than the opening area of
Most of the liquid refrigerant that has flowed into the tank 26 can be guided by the first outlet pipe 28 through the first return hole 31 and sent to the upper cylinder 5 . The liquid refrigerant can be prevented from flowing into the two second outlet pipes, and the lower cylinder 6
It is possible to prevent liquid refrigerant from flowing into the tank.

Therefore, the two second outlet pipes and the lower cylinder 6 are not cooled by the liquid refrigerant, thereby preventing the temperature of the lubricating oil 11 from decreasing due to the liquid refrigerant flowing into the two lower cylinders. I can do it. Therefore, the high-pressure gas refrigerant discharged into the casing 11 from both cylinders 5.6 comes into contact with the lubricating oil 10, liquefies it, and mixes into the lubricating oil 10.
It is possible to prevent deterioration of the lubricating properties of the In addition, occurrence of metal abrasion, galling, etc. in the sliding parts of the compressor A can be prevented.

Furthermore, by preventing the liquid refrigerant from flowing into the lower cylinder 6, the heat of the high-temperature gas refrigerant that has been compressed and heated in the lower cylinder 6 is actually transferred to the lubricating oil 10, and the lubricating oil 10 was found to increase the temperature.

When the accumulator 21 of this embodiment is used, each outlet pipe 28.2 has the same diameter (
As a result of conducting an experiment to compare the case where the oil return hole (for example, 1.5 mm) was provided at the same height with the (absolute) pressure inside the casing set to 20 kg/cm2 ABS * 50 °C, the second When the one shown in the figure was used, the temperature of the lubricating oil 10 was about 48°C, whereas when the accumulator 21 of this embodiment was used, the temperature of the lubricating oil 11 was about 63°C. The temperature rose by about 15 degrees.

Note that by setting the diameter of the second oil return hole 33 to be extremely small, or by eliminating the second oil return hole 31, the temperature rise of the lubricating oil 11 becomes even more remarkable. In this case, it is desirable to set the diameter of the first ura return hole 31 to be sufficiently large.

Further, the accumulator of the present invention can be connected to various types of compressors, such as rotary type and scroll type.

[Effects of the Invention] As explained above, the present invention has two cylinders arranged in the upper part and the lower cylinder immersed in lubricating oil from one tank into which gas refrigerant and oil flow. In an accumulator for a two-cylinder compressor that supplies gas refrigerant and oil to a two-cylinder compressor, a first outlet pipe connected to the upper cylinder of the two cylinders and a first outlet pipe connected to the lower cylinder two outlet pipes are provided, and the first and second outlet pipes are provided.
Insert the two estuary pipes into the tank so that they protrude upward in the tank, and the first outlet pipe is provided with a first oil return hole located inside the tank, and the second outlet pipe is provided with a first oil return hole located inside the tank. A second oil return hole is provided at a higher location than the oil return hole.

Therefore, the present invention significantly reduces the amount of refrigerant liquid flowing into the lower cylinder submerged in lubricating oil, prevents it from being cooled by the lubricant liquid refrigerant in the compressor, and reduces the lubrication of the lubricating oil. This has the effect of preventing deterioration of characteristics.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view showing an embodiment of the present invention.
#4 Zero is also a sectional view showing the conventional example. A...Compressor, 5...Upper cylinder, 6...Lower cylinder, 21...Accumulator, 26...
Tank, 28... first outlet pipe, 29... second outlet pipe, 31... first oil return hole, 33... second oil return hole.

Claims (1)

[Claims] From one tank into which gas refrigerant and oil flow,
In an accumulator for a two-cylinder compressor that supplies the gas refrigerant and the oil to a two-cylinder compressor in which two cylinders are arranged one above the other and the lower cylinder is immersed in lubricating oil,
A first outlet pipe connected to the upper cylinder of the two cylinders and a second outlet pipe connected to the lower cylinder are provided, and both the first and second outlet pipes are connected to the upper cylinder. The first oil return hole is inserted into the tank and projects upward within the tank, and the first outlet pipe is provided with a first oil return hole located within the tank, and the second outlet pipe is provided with a first oil return hole located within the tank. An accumulator for a two-cylinder compressor, characterized in that a second oil return hole is provided at a position higher than the oil return hole.