RU2298111C2 - Hermetic compressor - Google Patents

Abstract

FIELD: refrigerating engineering; compressors.

SUBSTANCE: invention relates to hermetic compressor for refrigerating equipment and it can be used in lubrication system of hermetic compressors with vertical crankshaft and slotted-link mechanism. Hermetic compressor has operating cylinder with piston connected through slotted-link mechanism with crank of vertical crankshaft provided with oil feed channel. The latter communicates at one side with oil bath, and at other side with hollow body rigidly coupled with one of links of slotted-link mechanism and provided with radial holes for directed delivery of part of lubricant to piston-cylinder friction zone. Hollow body is made in form of sleeve whose cylindrical part is secured in oil feed channel, and bottom is located over end face of crank. Radial holes should be preferably arranged between end face of crank and bottom of sleeve at level of upper generatrix of piston-cylinder pair.

EFFECT: increased efficiency of cooling and lubrication of friction zones.

2 cl, 2 dwg

Description

The invention relates to a hermetic refrigeration compressor and can be used in the lubrication systems of hermetic compressors with a vertical shaft and mainly rocker gear.

Known hermetic compressor containing a working cylinder with a piston connected through the connecting rod head with a crank of the crankshaft having an oil supply channel communicating on the one hand with the oil bath, and on the other with the connecting rod cavity open above, located above the upper end surface of the crankshaft, in the cylindrical crown of the connecting rod, limiting the spray cavity, a through groove is made for the directional ejection of part of the oil in the direction of the piston-cylinder friction pair [1].

A disadvantage of the known compressor with a directed ejection of part of the oil in the direction of the piston-cylinder friction pair is, firstly, the impossibility of using such a device for lubrication in compressors with a rocker gear due to the lack of a connecting rod and, secondly, since the connecting rod makes a reciprocating and rocking motion relative to the cylinder, oil spraying over the edge of the connecting rod crown will be uneven along the perimeter, which will lead to a decrease in cooling and lubrication efficiency.

Known hermetic compressor in combination with an oil distribution system containing a sealed casing, a frame with a cylinder located on it, a piston mounted in the cylinder and connected by a drive element with a crank of a vertical crankshaft, the lower end of which is connected to an oil pump located in the oil pan. A channel is made in the crankshaft, connected on one side to the oil pump, and on the other, to an inclined channel in the crank, the upper end of which is connected to an elongated hollow body, having a hole for ejecting lubricating oil into the reflector with a groove mounted on the cylinder head and forming her hole for passing lubricating oil to the cylinder head [2].

A disadvantage of the known hermetic compressor is the complexity of the structural solution of the oil distribution system and the insufficient lubrication efficiency in the piston-cylinder friction zone.

Known hermetic compressor containing a working cylinder with a piston connected by a connecting rod head with a crank of a vertical crankshaft containing a lubricant supply channel, the lower end of which is connected to the oil bath, and the upper end - with a hollow body rigidly connected to the connecting rod head and having supply holes lubrication to the friction and cooling zones of the compressor [3].

The disadvantage of this compressor, taken as a prototype, is, firstly, the inability to use its lubricating and cooling device in compressors with a rocker gear due to the lack of a connecting rod and, secondly, the low cooling and lubrication efficiency of friction zones due to the fact that the oil leaving the radial holes of a hollow body rigidly connected with a crank, it is sprayed unevenly. This is due to the fact that the outflow of oil from the openings of the hollow body due to the changing centrifugal force occurs in a pulsating mode, while the cooling and lubrication of the compressor units will be uneven.

The proposed invention solves the problem of increasing the efficiency of compressor cooling and lubrication of friction zones in compressors with a rocker gear.

To achieve this technical result, in a hermetic compressor containing a working cylinder with a piston connected via a transmission mechanism with a crank of a vertical crankshaft having an oil supply channel communicating on the one hand with the oil bath, and on the other, rigidly connected to one of the links of the transmission mechanism a hollow body having radial holes for the directed supply of part of the lubricant to the piston-cylinder friction zone, while the hollow body is made in the form of a sleeve, the cylindrical part of which is fixed in the oil supply channel, and the bottom is located above the end of the crank. It is advisable to place radial holes between the end of the crank and the bottom of the liner at the level of the upper generatrix of the piston-cylinder pair.

Figure 1 shows a partial sectional view of the proposed compressor, figure 2 is a top view of the compressor.

The hermetic compressor comprises a motor cover 1, a cylinder 2, a piston 3, connected with a crank 4 of a vertical crankshaft 5 by means of a slider 6 and a link 7, which are a transmission mechanism. The vertical shaft 5 has an oil supply channel 8, which extends in the region of the sliding bearing 9 along a helical line outside the shaft 5, and in its upper part, inside the crank 4. A sleeve 10 is located in the oil supply channel 8 of the crank 4, the cylindrical part 11 of which is fixed in the channel 8 and the radial holes 12 are located between the upper end 13 of the crank 4 and the bottom 14 of the sleeve 10. Radial holes 12 are located at the level of the upper generatrix of the piston-cylinder friction pair. The lower end of the oil channel 8 communicates with the oil bath (not shown in FIG.), And the upper end exits through the crank 4 into the oil spray zone. The sleeve 10, mounted in the oil supply channel 8 of the crank 4, serves as an oil spray during operation of the compressor.

When the compressor is operating, oil from the oil bath through the channel 8 is fed into the cavity of the sleeve 10, from where, under the action of centrifugal forces, it is ejected through the radial holes 12 both into the piston-cylinder friction zone and to other components and parts of the compressor for cooling them.

Since the sleeve 10 performs rotational movements, while the open cavity of the connecting rod (prototype) performs a reciprocating motion, lubrication efficiency and uniformity of oil spraying according to the invention are higher.

In addition, the directional supply of oil to the gap of the rubbing piston-cylinder pair due to the location of the radial holes between the end of the crank and the bottom of the sleeve increases its tightness and lubrication and cooling efficiency and, as a result, increases the refrigeration capacity and energy efficiency coefficient (Ke) of the compressor. The uniformity of the spray of oil also creates a sound-absorbing effect. The test results for the adjusted sound power level of the KVO-120 compressor showed a decrease in the corrected sound power level.

Information sources

1. RF patent No. 2173403, F04B 39/02, publ. 09/10/2001.

2. RF patent No. 1521286, F04B 39/02, publ. 10/02/1989.

3. Auth. testimonial. USSR No. 1476189, F04B 39/02, publ. 04/30/1989 (prototype).

Claims (2)

1. A hermetic compressor containing a working cylinder with a piston connected through a transmission mechanism with a crank of a vertical crankshaft having an oil supply channel communicating on one side with an oil bath, and on the other hand, with a hollow body rigidly connected to one of the links of the transmission mechanism having radial holes for the directional supply of a part of the lubricant to the piston-cylinder friction zone, characterized in that the hollow body is made in the form of a sleeve, the cylindrical part of which is fixed in the oil supply channel, and the bottom of the guards PS is located above the end of the crank. 2. The compressor according to claim 1, characterized in that the radial holes are located between the end of the crank and the bottom of the sleeve at the level of the upper forming pair of the piston-cylinder.

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