KR930001198Y1 - Enclosed-type compressor - Google Patents

Abstract

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Description

Hermetic compressor

1 is a side cross-sectional view showing an embodiment of the present invention.

2 is a plan view showing the packing.

3 is an exploded perspective view of the valve cover of the cylinder head.

4 is a side cross-sectional view showing the relationship between the flow rate of the lubricating oil flowing out of the vertical hole and the oil temperature.

6 is a plan view of FIG.

7 and 8 are side cross-sectional views showing a conventional example.

* Explanation of symbols for main parts of the drawings

3: crankshaft 25: vertical hole

26: crank pin 29: exit

The present invention relates to a hermetic compressor, and more particularly, to a hermetic compressor having an improved lubrication device for cooling the inside of the hermetic case by scattering lubricating oil.

Generally, the compression section of a hermetic compressor is as shown in FIGS. 5 and 6.

As shown, the compression part 2 is provided in the upper part of the sealing case 1, and this compression part 2 is mainly provided with the crank shaft 3 located in the center part, and this crank shaft 3 mutually. The piston 4 and the cylinder 5 which are connected are comprised by the muffler 6 which covers about the crankshaft 3 mentioned above about half and is installed so that it may extend from both sides of the cylinder 5.

It is known that the structure of the crank pin portion 7 of the crankshaft 3 described above, which forms part of the oil supply device, as shown in FIGS. 7 and 8.

As shown in the figure, the crank pin portion 7 of the crankshaft 3 has a longitudinal hole 8 which is located near the center portion thereof, is opened upward, cools the inside of the sealed case 1 by scattering lubricating oil, and this vertical length. Cranks are provided to connect the holes 8 and the crank pin portion 7 to the outer circumferential surface, and to supply lubricant to the entire circumference of the crank pin portion 7 and the horizontal hole 9 for supplying lubricant to the outer circumferential surface. The inclined groove 10 cut out in the state which connected the outer periphery surface of the pin part 7 so that it communicates with the above-mentioned horizontal hole 9 is provided.

And the opening area of the upper outlet 11 side of the above-mentioned vertical hole 8 is installed so that the diameter is widened to about half of the diameter of the crank pin 7, or the same as the diameter, so as to greatly open. It was.

When lubricating oil is supplied to the crank pin portion 7 having the above configuration, the lubricating oil is transferred from the vertical hole 8 to the entire outer peripheral surface of the crank pin portion 7 by the inclined groove 10 through the horizontal hole 9. Supplied to lubricate the crank pin portion 7 while passing through the above-mentioned longitudinal hole 8 and flying from the outlet 11 into the sealed case 1 to cool the inside of the sealed case 11.

Since the opening area of the outlet 11 of the vertical hole 8 described above is set sufficiently large as compared with the amount of lubricating oil supplied to the outlet 11 through the vertical hole 8, the lubricating oil is the outlet 11. It is scattered about horizontally from.

However, since the outlet 11 of the crankpin portion 7 described above is covered by the cylinder 5 and the muffler 6 provided on both sides of the cylinder 5, the lubricating oil may scatter outside the range indicated by the broken line in FIG. Can't.

For this reason, there was a problem that the inside of the sealed case 1 could not be sufficiently cooled.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a hermetic compressor having an oil supply device capable of effectively cooling the inside of the hermetic case without any obstacle to the cylinder and the muffler.

In order to achieve the above object, the present invention provides an oil passage for installing a compression element in the upper part of the sealed case, supplying lubricating oil to the crankshaft driving the compression element, and cooling the inside of the waste case. In the hermetic compressor which is connected to the passage and is provided with a vertical hole extending upwardly through a crank pin eccentric from the crankshaft center, the area "S" of the opening at the outlet side of the vertical hole described above is It is set to satisfy the following equation.

However, when Lv / Lh> 0.27, A = Lh / Lv, Lv / Lh At 0.27, A = 1 / 0.27, where Q is the flow rate per unit time of lubricating oil flowing out from the outlet at oil temperature 100 ℃, r is the eccentricity of the outlet to the crankshaft, and Lh is the distance from the center of the crankshaft to the muffler. Where Lv is the difference between the outlet of the upper end of the crank pin part and the height of the upper end of the muffler, and f is the operating frequency of the crankshaft.

In this way, the lubricating oil can be effectively scattered from the above-mentioned outlet of the vertical hole to sufficiently cool the inside of the sealed case.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

The overall structure of the compression section installed in the hermetic compressor is the compression section 2 provided on the upper portion of the sealed case 1 in the same manner as the conventional example shown in FIGS. 5 and 6, and the compression section 2 Is mainly composed of the crankshaft (3) and the piston (4), the cylinder (5) and the muffler (6).

At the head of the cylinder 5 described above, a valve cover 12 having a suction chamber (not shown) and a discharge chamber (not shown) is provided with a fixing bolt 13 as shown in FIG. 5) It is installed to cover the head.

In between the cylinder 5 and the valve cover 12, there is an inlet valve plate 16 which forms an intake valve 15 while there is an outlet passage hole 14 which forms an outlet passage from the cylinder 5 side. And a thick discharge valve plate (19) having a suction passage hole (17) forming a suction passage and forming a discharge valve (l8), the discharge valve plate (19) and the valve cover (12) described above. A valve packing 20 for sealing is provided.

The valve packing 20 described above is composed of two parts, the suction chamber side 12 and the discharge chamber side 22, for sealing the suction chamber and the discharge chamber of the valve cover 12, respectively, as shown in FIG.

The width Ls of the suction chamber side 21 outside the valve packing 20 is set smaller than the width Ld of the discharge chamber width 22.

This narrows the width of each part of the vertical frame 23, the bolt hole 24, etc. constituting the suction chamber 21 of the valve packing 20, and also shortens the distance of the outer circumference. In order to improve the sealing property of the discharge chamber width 22 which becomes smaller in the suction chamber side 21 than the discharge chamber side 22, and becomes a high pressure.

On the upper part of the crankshaft 3 mentioned above, the crank pin part which concerns on this invention is provided.

As shown in FIG. 1, the crank pin portion is located in the center of the center and is opened upwards. The crank pin portion is connected to the oil passage 30 to cool the inside of the sealed case 1 by scattering lubricating oil. 25), the horizontal hole 27 which connects this longitudinal hole 25 and the crank pin part 26 outer peripheral surface, and supplies lubricating oil to this outer peripheral surface, and the whole of the outer peripheral surface of the crank pin part 26. It consists of the inclined groove 28 cut out in the state which connected the outer periphery surface of the crank pin part 26 so that it may communicate with the above-mentioned horizontal hole 27, in order to supply lubricating oil to both.

In particular, the feature of the present invention lies in that the area "S" of the opening of the outlet 29 of the longitudinal hole 25 is set to a size satisfying the following equation.

Q: amount of eccentricity (mm) of the outlet (29) for the crankshaft (3), Lh:: flow per unit time of the lubricating oil flowing out from the outlet 29 from the oil temperature ^{100 ℃ (mm 3 / s)} , r crankshaft (3) Distance from the center of (3) to the muffler (6), Lv: difference between the height of the outlet 29 of the upper part of the crank pin part 26 and the upper part of the muffler (mm), f: crankshaft The operating frequency (Hz) of (3) is established for the following reasons.

When the velocity in the vertical direction of the lubricant flowing out of the outlet 29 of the longitudinal hole 25 is set to Vv and the velocity in the horizontal direction is set to Vh, Vv is the lubricant passing through the unit area in the unit area per unit time. Vh is the quantity eccentricity r of the outlet 29 multiplied by the angular velocity, and is expressed by the following equation.

In order for the lubricating oil flying from the outlet 29 of the longitudinal hole 25 to jump over the muffler 6, the amount of lubricating oil supplied from the horizontal hole 27 to the outer circumferential surface of the crank pin part 26 is considered. If it is not set so that the direction (Vv / Vh) of the velocity of the lubricating oil flying from the outlet 29 is larger than the elevation angle Lv / Lh looking at the upper end of the muffler 6 from the outlet 29. Can not be done.

To do this, the following equation is used.

And (1) is obtained from (2) (3) (4).

Furthermore, the upward angle of the lubricating oil is at an angle exceeding 15 °, even at the lowest, in consideration of the cooling efficiency.

Therefore, when the elevation angle α, which looks at the upper end of the muffler 6 from the outlet 29 of the longitudinal hole 25, exceeds 15 °, as in the limited support of the formula (1), that is, α = Lv / Lh> tan When 15 ° = 0.27, the above equation (4) is satisfied. If elevation angle α is less than or equal to 15 °, ie Lv / Lh When 0.27, it is higher than 15 degrees in the direction of the lubricating oil's scattering speed (Vv / Vh), so that (4) is Vv / Vh> tan 15 degrees = 0.27, It is set to be.

By the configuration as described above, the hot lubricant oil is scattered from the outlet 29 to the entire inside of the sealed case 1.

Therefore, the temperature of the lubricating oil is transmitted to the sealed case 1, and again transferred to the air, whereby the inside of the sealed case 1 can be effectively cooled.

Moreover, when setting the area S of the opening 29 of the outlet 29 of the longitudinal hole 25, the flow rate Q of the lubricating oil from the outlet 29 was set at an oil temperature of 100 ° C, as shown in FIG. This is because the temperature increases with the increase of oil temperature, but the change becomes less as the temperature gets higher, and the change suddenly becomes small at about 100 ℃.

In addition, at low temperatures, it is not necessary to expect the aforementioned cooling effect.

Eventually, according to the present invention, it is possible to exert an excellent effect as follows.

The area S of the opening opened toward the outlet of the vertical hole installed in the crank pin part

Lv / Lh> 0.27, A = Lh / Lv, Lv / Lh At 0.27, A = 1 / 0.27 was set and the flow rate Q of the lubricating oil from the exit roll was set to a value in the high temperature range (100 ° C) of the lubricating oil. It can be efficiently scattered and cooled inside the compressor to suppress overheating of the compressor.

In this way, the reliability of the compressor can be improved.

Claims (1)

Compression element provided in the upper part in the sealed case 1, oil passage 30 for supplying lubricating oil formed on the crankshaft 3 driving the compression element, and eccentrically from the center of the crankshaft 3; The crank pin 26, which has been mounted around the crank shaft 26, and the crank pin eccentrically formed from the crank shaft center described above while being connected to the oil passage for cooling the inside of the sealed case. In having the vertical hole 25 penetrating upward through the area S of the injection site of the oil outflow side of the vertical hole, A = Lh / Lv (when Lv / Lh> 0.27) or A = 1 / 0.27 (Lv / Lh 0.27), Q is the flow rate per unit time flowing out of the vertical hole at oil temperature 100 ℃, r is the eccentricity of the open part of the vertical hole with respect to the crankshaft, f is the operating frequency of the crankshaft, and Lh is from the center of the crankshaft. The distance to the muffler, Lv is a hermetic compressor characterized in that it is set so as to satisfy the formula of the difference between the open portion of the vertical hole of the crank pin upper end and the upper end of the muffler.