CN104791221A - Refrigerant compressor, piston of a refrigerant compressor and piston arrangement - Google Patents

Abstract

The invention relates to a refrigerant compressor, a piston of a refrigerant compressor, and a piston arrangement. The invention concerns a refrigerant compressor with a cylinder, in which is arrangeda piston (5) that is connected to a crankshaft via a connecting rod (14), the connecting rod (14) having a piston eye (18), through which a bolt (17) inserted in the piston (5) is guided. With such arefrigerant compressor, it is endeavoured to achieve a good efficiency. For this purpose, the bolt (17) is inserted in a blind bore (19).

Description

The piston of coolant compressor, coolant compressor and piston apparatus

The application is the application number submitted on August 6th, 2009 is the divisional application of the Chinese invention patent application of 200910164132.7.

Technical field

The present invention relates to the coolant compressor with cylinder, be furnished with piston in cylinder, piston is connected to bent axle through connecting rod, and connecting rod has piston eye, and the latch be inserted in piston is conducted through this piston eye.

And, the present invention relates to the piston of this coolant compressor and there is the piston apparatus of connecting rod, latch and piston.

Background technique

Aforementioned coolant compressor, such as, disclose in DE19522210C1.In this article, latch is connected to piston by press fit.In order to reduce the too serious distortion of piston, press fit has a pair matching surface, and it bears the normal direction tension force be reduced on piston circumference direction.

At the duration of work of coolant compressor, piston is by crank-driven to-and-fro motion in the cylinder.In this connection, the rotary motion of bent axle is converted to the translational motion of piston by connecting rod.The motion compresses of piston or expand the pressing chamber of cylinder.Between compression period, pressure increases, and compresses the refrigeration agent of inspiration cylinder thus.

In order to the efficiency obtained, if possible, the refrigeration agent of all compressions all should be supplied to refrigeration system, such as, be connected to the refrigerator of coolant compressor and the refrigerator of air-conditioning system.But, small part refrigerant gas usually cannot be avoided to flow to piston rear portion, enter the inside of the housing arranging compressor.

Summary of the invention

Task of the present invention realizes possible peak efficiency.

This task uses the coolant compressor mentioned in introduction to be accomplished, and in this compressor, latch is inserted in blind hole.

By the design reduces the leakage of refrigerant gas.Be provided with through hole in piston, in this through hole, insert the embodiment of latch contrary, this solution only has one independent " weakened zones ", and the air-flow of increase can flow through this region, i.e. the region of the opening of blind hole.Reduce owing to revealing, noise level decreases.Therefore, the silencing apparatus with smaller soundproof effect can be used, but also therefore have less throttle resistance.This has positive influences to efficiency equally.And adopt blind hole, the perisporium of piston only includes one needs processed opening.This means, only must guarantee not have burr in the region of this opening or from other residue of Drilling operation or similar leftovers, these things can increase the frictional force between piston and cylinder.

Preferably, with being slidably matched latch is arranged in piston.Use is slidably matched, and during inserting latch, the danger of piston distortion is less than the distortion danger produced when using press fit.Because latch is inserted in blind hole, therefore the danger that drops out of latch is substantially less.Particularly during assembling coolant compressor, if when transmitting piston in the mode under the closed end of blind hole turns to, so no longer need by press fit, latch to be remained in piston.The distortion of piston is less, and the better maintenance of piston is adapted to the shape of cylinder, and during compression stroke, the sealing between piston and cylinder is also better.

Preferably, elasticity screw rod is adopted to be remained in piston by latch.Elasticity screw rod is used on piston with certain masterpiece.But the danger of piston distortion uses the danger of being out of shape during the press fit of latch much smaller than in piston.When latch remains in piston by elasticity screw rod, latch remains on not against on the position of cylinder wall.Thus the frictional force that can reduce refrigerant compression engine efficiency again can not be increased.

Preferably, elasticity screw rod extends on the direction being parallel to piston movement.Therefore, elasticity screw rod can be inserted need not through the perisporium of piston in piston.

Preferably, elasticity screw rod is arranged in and originates in the passage of the piston side of bent axle.Thus the pistons front sides of the pressure chamber that has a common boundary in the cylinder can remain unchanged.Particularly, there is not the risk that passage causes pressure chamber to reveal here.

Preferably, Path Termination is in the pistons front sides towards bent axle.This makes assembling simplify.At assembly process, do not need in internal piston work.On the contrary, can assemble by calm accessible pistons front sides.

Preferably, elasticity screw ends is inner at latch.Thus, only need to carry out relatively simply processing so that elasticity screw rod can be inserted to piston.The passage holding elasticity screw rod ends at the side face of blind hole subsequently.

Preferably, latch comprises cavity.This cavity can be used for two objects.First, the quality of latch is which reduced.During operation, latch also contributive moving mass is less, and effect power is on the moving part less, and the risk of wearing and tearing is also less.Secondly, the cavity of latch also can be used in providing lubricant oil.

Particularly when cavity starts from the axial end portion of latch, and when penetrating this latch on a part of axial length of latch, just there will be this situation.First, this prevent the collision of cavity and elasticity screw rod, thus prevent the danger of leakage.Secondly, the oil being fed to cavity can arrive the wall of cylinder, and oil produces at this lubricating film contributing to improving sealing.

Preferably, cavity is connected to the oily passage in connecting rod through the radial passage in tie bar regions.So can by this oily passage supply for the oil lubricated.

Adopt the piston of coolant compressor, solve this task, wherein, piston is according to description manufacture above, and the receiving bore be drilled to of latch makes blind hole.

This piston decreases the quantity existing and reveal dangerous position.

The present invention also relates to the piston apparatus with connecting rod, latch and described type piston.

Accompanying drawing explanation

Hereinafter, based on the preferred embodiment relevant to accompanying drawing, the present invention is described.

Fig. 1 is the schematic cross sectional views of coolant compressor;

Fig. 2 is piston apparatus;

Fig. 3 is piston;

Fig. 4 is latch; And

Fig. 5 is the perspective view of this piston apparatus.

Embodiment

The seal casinghousing 2 of casing form is comprised in FIG with the coolant compressor 1 shown in explanatory view.The compressor block 3 with cylinder 4 is arranged, piston 5 to-and-fro motion in cylinder 4 in housing 2.Piston 5 and cylinder 4 boundary pressing chamber 7 together with cylinder head 5.

By the bent axle 8 driven by motor 9, piston 5 produces motion in cylinder 4.Motor 9 has stator 10 and rotor 11, and bent axle 8 is connected on rotor.

Be provided with crank pin 12 in one end of bent axle 8, this crank pin is around axis 13 along rail moving during operation.Connecting rod 14 is connected on crank pin 12, and connecting rod 14 is connected on piston, is described in detail by contact Fig. 2 to this.

At bottom section, housing 2 has oil groove 15, and oil pump 16 is immersed in oil groove, and oil is upwards pumped across the crank 8 of hollow by oil pump on crank pin 12 direction.

Piston 5 is connected to bent axle 8 by latch 17, and this latch 17 is inserted in the piston eye 18 also through bent axle 8 in piston 5.Latch 17 is inserted in the blind hole 19 in piston, and namely latch 17 can only insert piston 5 from side.Therefore blind hole 19 only has an opening 20 in side.At the other end, blind hole 19 is closed by the perisporium 21 of piston 5.

Latch 17 rests on being slidably matched in piston 5, and namely latch does not have tension force or resting in piston 5 at least with very little tension force.In a word, tension force is so little so that piston 5 can not be caused to be out of shape.

Elasticity screw rod 22 inserts piston 5 and latch 17 from the front side 23 in the face of bent axle 8 of piston 5.For this reason, piston 5 has the passage 24 ending at blind hole 19.Latch 17 has diametric hole 25, and elasticity screw rod 22 ends at diametric hole.Elasticity screw rod 22 can flexibly remain in the passage 24 of latch and piston 5.But, do not need too high reactive spring force.Because reactive spring force is very low, thus the spring reaction of elasticity screw rod 22 risk that piston 5 is out of shape is very little.Such as, passage 24 can have throat 26, and elasticity screw rod 22 remains on wherein (Fig. 3).Thus, elasticity screw rod 22 only has spring reaction to piston 5 in the region of throat 26.

Latch 17 has cavity 27, extends from the freely front side of latch.Cavity 27 is connected to the oily passage 29 be formed in connecting rod 14 through radial passage 28.Oil passage 29 is by oil pump 16 fuel feeding.Subsequently, oil flows into cavity 27 by radial passage 28 and flows into the opening 20 of blind hole 19 from here, and in opening 20, oil contributes to improving sealing.

Oil passage 29 extends to opening 30, and opening 30 terminates in the cavity 31 being formed at piston 5 inside.Thus, oil be also injected in cavity 31 in and arrive the contact area between piston 5 and cylinder 4 by the radial opening 32 in the perisporium of piston, to seal contact area, prevent the infiltration of gas.

When connecting rod 14 is arranged on piston 5 by latch 17, can easily elasticity screw rod 22 be advanced in passage 24.Because elasticity screw rod 22 is never pushed by the front side 23 that connecting rod 14 covers, thus its installation no problem be possible.

The embodiment illustrated allows the sealing improving pressing chamber 7 in compression stroke.The sealing reduced only is there is in opening 20 region of blind hole 19.But because this occurs on a position in circumference direction, and be different from occurring on two positions when using through hole, leakage is actually and has been halved.Due to the leakage reduced, also reduce noise level, this also has positive influences to efficiency.

And because can only through a point from the pressure of pressing chamber 7, the opening 20 namely in piston 5 enters cavity 27, therefore improves lubricity.This pressure can produce the mixture of lubricant oil and gas, thus reduces the greasy property of oil, also reduces the lubricity between piston eye 18 and latch 17.Because reduce gas pressure here, so turn improve lubricity.Due to being slidably matched between piston 5 and latch 17, the distortion of piston reduces.This also increases the efficiency of compressor 1.And, when manufacturing piston 5, only need process region, i.e. the region of the opening 20 of blind hole 19, to remove cutter trade.Therefore, this makes the risk of the mistake processing causing frictional force to increase lower, and this produces actively impact to the efficiency of compressor 1 again.

Claims (11)

1. one kind has the coolant compressor of cylinder, piston is furnished with in cylinder, piston is connected to bent axle through connecting rod, connecting rod has piston eye, the latch be inserted in piston is conducted through this piston eye, it is characterized in that: latch (17) is inserted in blind hole (19), wherein, latch (17) have press fit by being slidably matched is not arranged in piston (5).

2. coolant compressor according to claim 1, is characterized in that: latch (17) remains in piston (5) by means of elasticity screw rod (22).

3. coolant compressor according to claim 2, is characterized in that: elasticity screw rod (22) extends being parallel on the direction that piston (5) moves.

4. coolant compressor according to claim 3, is characterized in that: elasticity screw rod (22) is arranged in passage (24), and this passage originates in the side in the face of bent axle (8) of piston (5).

5. coolant compressor according to claim 4, is characterized in that: passage (24) ends at the front side (23) in the face of bent axle (8) of piston (5).

6. the coolant compressor according to any one of claim 2 to 5, is characterized in that: it is inner that elasticity screw rod (22) terminates in latch (17).

7. the coolant compressor according to any one of claim 1 to 5, is characterized in that: latch (17) comprises cavity (27).

8. coolant compressor according to claim 7, is characterized in that: cavity (27) starts from the axial end portion of latch (17), and penetrates latch (17) on a part of axial length of latch.

9. coolant compressor according to claim 7, is characterized in that: the oily passage (29) in connecting rod (14) is led in cavity (27) via the radial passage (28) in the region of connecting rod (14).

10. the piston of the coolant compressor according to any one of claim 1 to 9, wherein, the accommodating chamber be drilled to of latch (17) is made into blind hole (19).

11. 1 kinds of piston apparatus, have connecting rod (14), latch (17) and piston according to claim 10 (5).