KR101480466B1 - Reciprocating compressor and refrigerator having the same - Google Patents

Abstract

The present invention relates to a reciprocating compressor and a refrigeration apparatus having the same. In the present invention, an anti-vibration member is provided on the bottom surface of the compressor casing, so that the vibration generated in the compressor body is canceled by the anti-vibration member, so that the noise of the compressor and the refrigerator using the compressor can be reduced. In addition, the anti-vibration member prevents the byproducts generated when the compressor is assembled to the compressor body together with the oil, thereby enhancing the reliability of the compressor and the refrigerating machine to which the compressor is applied.

Reciprocating compressor, reciprocating motor, dustproof, oil feeder

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reciprocating compressor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor and a refrigerating machine using the reciprocating compressor. More particularly, the present invention relates to a technique of damping vibrations of a casing and filtering foreign substances in the oil.

Generally, a reciprocating compressor is a system in which a piston linearly reciprocates in a cylinder and sucks and compresses a refrigerant to discharge the refrigerant. The reciprocating compressor can be divided into a connecting type and a vibrating type according to the driving method of the piston. In the connection type reciprocating compressor, the piston is connected to a rotary shaft of a rotary motor by a connecting rod and reciprocates in a cylinder to compress refrigerant. On the other hand, in the vibrating reciprocating compressor, the piston is connected to the mover of the reciprocating motor and reciprocates in the cylinder while vibrating to compress the refrigerant. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating reciprocating compressor. In the following description, the vibrating reciprocating compressor is abbreviated as a reciprocating compressor.

The reciprocating compressor repeats a series of processes of sucking, compressing, and discharging the refrigerant while the piston and the cylinder reciprocate in the direction of the magnet flux of the reciprocating motor. In this process, the oil filled in the casing is supplied to the lubricating surface between the cylinder and the piston through the oil film.

However, in the above-described conventional reciprocating compressor, vibration is generated in a series of processes for compressing the refrigerant, and the vibration is finally transmitted to the casing and is discharged to the outside. In particular, when a high-pressure refrigerant such as R134a is applied, the vibration of the compressor is increased and it is difficult to attenuate the vibration noise of the compressor only by a design change of the compression unit or the like.

In the process of manufacturing the compressor, a by-product such as a welding piece is generated, and the by-product is immersed in the oil, and can be introduced into the lubricating surface between the cylinder and the piston through the oil feeder. However, such by-products may wear out the lubricating surface between the cylinder and the piston, thereby reducing the reliability of the compressor or causing friction loss.

The present invention solves the problems of the conventional reciprocating compressor as described above, effectively damping the vibration transmitted to the casing, and preventing foreign matter immersed in the oil in the casing from flowing into the oil feeder, thereby attenuating vibration noise, And an object of the present invention is to provide a reciprocating compressor capable of increasing efficiency and a refrigeration apparatus using the same.

In order to accomplish the object of the present invention, there is provided an internal combustion engine comprising: a casing having a closed internal space and filled with a predetermined amount of oil in the internal space; A reciprocating motor provided in an inner space of the casing and reciprocating in a straight line by the mover; A compression unit coupled to the reciprocating motor to compress the refrigerant; An oil feeder coupled to the compression unit to pump the oil in the casing to the compression unit; And an anti-vibration member installed on a bottom surface of the casing to damp vibration, wherein a bottomed hole is formed on a central portion of the anti-vibration member and is tightly fixed to a bottom surface of the casing, There is provided a reciprocating compressor in which a reinforcing protrusion is formed to be spaced apart from a bottom surface by a predetermined distance.

In addition, A condenser connected to a discharge side of the compressor; An expander connected to the condenser; And an evaporator connected to the inflator and connected to a suction side of the compressor, wherein the compressor is provided with a dustproof member having a reservoir hole and a reinforcing protrusion on a bottom surface of the casing.

The reciprocating compressor according to the present invention and the refrigerating machine employing the same are provided with a vibration preventing member on the bottom surface of the casing so that the vibration generated in the compressor body is canceled by the vibration preventing member to reduce the noise of the compressor and the refrigerator have. In addition, the anti-vibration member prevents the byproducts generated when the compressor is assembled to the compressor body together with the oil, thereby enhancing the reliability of the compressor and the refrigerating machine to which the compressor is applied.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a reciprocating compressor and a refrigerator according to the present invention will be described in detail with reference to the accompanying drawings.

1, the reciprocating compressor according to the present invention includes a casing 10 in which a gas suction pipe SP and a gas discharge pipe DP are communicated with each other, a frame unit 21 elastically supported in the casing 10, A reciprocating motor 30 supported by the frame unit 20 and a mover 33 to be described later reciprocating in a straight line and a driving motor 30 for driving the mover 33 of the reciprocating motor 30 A compression unit 40 coupled to the piston 42 and supported by the frame unit 20 and a piston 42 of the compression unit 40 in the moving direction A plurality of resonance units 50 which are elastically supported by the frame unit 200 to induce a resonance movement of the casing unit 100 and an oil pump 50 which is connected to the frame unit 200 and pumps the oil of the casing 100 while oscillating together, Feeder (600).

The casing 100 includes a lower cap 110 which resiliently holds the compressor main body including the frame unit 200, the reciprocating motor 300, the compression unit 400, the resonance unit 500 and the oil feeder 600, And an upper cap 120 covering the upper opening of the lower cap 110 to form a closed space. The gas suction pipe SP and the gas discharge pipe DP are connected to each other at the rear side of the lower cap 110. The gas discharge pipe DP is connected to the compression unit 400 by a loop pipe RP, Is connected to the discharge cover 460 of FIG.

The frame unit 200 includes a first frame 210 supporting the compression unit 400 and supporting the front side of the reciprocating motor 300 and a second frame 210 coupled to the first frame 210, And a third frame 230 coupled to the second frame 220 and supporting a plurality of second resonance springs 530 to be described later. The frame unit 200 is resiliently supported on the bottom surface of the casing 100 by support springs 720 at the front and rear sides thereof, that is, at four places in a planar projection.

The reciprocating motor 300 includes an outer stator 310 supported between the first frame 210 and the second frame 220 and having a coil 311 wound thereon, And a magnet 331 is provided to correspond to the coil 311 of the outer stator 310 so that the outer stator 310 and the outer stator 310 are coupled to each other, And an inner stator 320. The mover 330 reciprocates linearly along the magnetic flux direction. The outer stator 310 and the inner stator 320 are formed by stacking a plurality of thin stator cores one by one in a cylindrical shape or by stacking a plurality of thin stator cores in a block shape and radially stacking the stator blocks.

The compression unit 400 is coupled to the mover 330 of the reciprocating motor 300 and is connected to the compression chamber P of the cylinder 410, A suction valve 430 installed at the tip of the piston 420 for controlling the suction of the refrigerant gas while opening and closing the suction passage 421 of the piston 420, A discharge valve 440 mounted on the discharge side of the cylinder 410 to regulate the discharge of the compressed gas while opening and closing the compression space P of the cylinder 410 and a discharge valve 440 for elastically supporting the discharge valve 440 And a discharge cover 460 fixed to the first frame 210 at a discharge side of the cylinder 410 to receive the discharge valve 440 and the valve spring 450. A loop pipe RP is connected to one side of the discharge cover 460 and the loop pipe RP is connected to the gas discharge pipe DP.

The resonance unit 500 includes a spring supporter 510 coupled to a connection portion between the mover 330 and the piston 420 and first resonance springs 520 supported on the front side of the spring supporter 510. [ And second resonance springs 530 supported on the rear side of the spring supporter 510. [

The oil feeder 600 includes an oil cylinder 610 installed between the first frame 210 and the second frame 220 and a second oil chamber 610 inserted into the oil cylinder 610, And an oil valve 630 for opening and closing the inlet and the outlet of the oil cylinder 610 to pump the oil.

The oil cylinder 610 is formed in a cylindrical shape having both a suction port and a discharge port at both ends thereof. The suction port is formed downward in the vertical direction toward the bottom surface of the casing, and the discharge port is formed in the first frame 210, And is vertically upwardly communicated with the oil passage 215 provided in the oil passage 215. The suction port may be formed separately or integrally formed with the oil cylinder 640. And the suction port may be formed to be positioned approximately at the center of the bottom surface of the casing.

The oil piston 620 is slidably inserted into the oil cylinder 610 to perform a relative movement with respect to the oil cylinder 610 in response to vibration of the compression unit 400, And oil springs are further provided on both sides of the front and rear sides so that the relative movement can be performed flexibly.

The reciprocating compressor according to the present invention operates as follows.

That is, when power is applied to the reciprocating motor 300 and a magnetic flux is formed between the outer stator 310 and the inner stator 320, a magnetic flux is generated between the outer stator 310 and the inner stator 320 The mover 330 continuously moves reciprocally by the resonator unit 500 while moving along the direction of the magnetic flux. When the piston 420 moves backward in the cylinder 410, the refrigerant filled in the inner space of the casing 100 flows through the suction passage 421 of the piston 420 and the suction valve 430 And is sucked into the compression space P of the cylinder 410. When the piston 420 moves forward in the cylinder 410, the refrigerant gas sucked into the compression space P is compressed and discharged while opening the discharge valve 440, And then discharged to the condenser of the refrigeration cycle through the discharge cover 460 and the loop pipe RP.

At this time, the piston 420 reciprocates linearly in the cylinder 410 and vibrates in the forward and backward directions. The vibration is transmitted to the oil feeder 600 through the frame unit 200, The pumping force at the pump 600 is generated. The oil in the casing 100 is supplied to the space between the cylinder 410 and the piston 420 through the oil passage 215 of the oil chamber 610 and the first frame 210 by the oil pumping force, The oil is lubricated between the cylinder 410 and the piston 420.

The vibration generated by the reciprocating motion of the reciprocating motor 300 and the compression unit 400 or the vibration generated by the opening and closing operations of the suction valve 430 and the discharge valve 440 is transmitted to the loop pipe RP to the casing 100, and this vibration can be emitted through the casing 100 in a noise form. However, when the dustproof member 800 is installed on the bottom surface of the casing 100 as shown in FIGS. 1 and 2, the vibration, that is, the vibration generated in the compressor main body and transmitted to the casing 100, Is canceled by the member 800 to eliminate vibration noise of the compressor. In addition, the anti-vibration member 800 prevents the byproducts generated when the compressor is assembled, that is, welding pieces generated while welding the lower cap 110 and the upper cap 120, to the oil feeder together with the oil can do.

For this purpose, the anti-vibration member 800 is formed in a substantially circular dish shape in a planar projection, and a reservoir hole 810 is formed on the central portion thereof so as to be welded to the bottom surface of the lower cap 110, The reinforcing protrusion 820 is formed at an edge of the lower cap 110 and is bent outwardly at a predetermined distance from the bottom surface of the lower cap 110. In addition, the anti-vibration member 800 may be spot welded on at least three positions along the circumferential direction on its bottom surface, in four places in the drawing. It is preferable that the anti-vibration member 800 is welded in a concentric circle (W), because the welding strength can be increased.

The oil reservoir 810 has an inner space in which the end of the oil inflow pipe 640 of the oil feeder 600 can be inserted and oscillate by a predetermined amount, Is larger than the outer diameter of the inlet end.

The center A of the oil retention hole 810 corresponds to the center B of the oil absorber 640 when the compressor is stopped and the center A of the oil retention pipe 810, Considering that the oil feeder 600 is vibrated, the inner diameter of the oil reservoir 810 is determined by the outer diameter of the oil absorber 640 and the reciprocating distance of the mover of the reciprocating motor 640, Is not less than the sum of the lengths.

5, the height of the reinforcing protrusion 820, that is, the height h1 from the bottom surface of the lower cap 110 to the upper surface of the reinforcing protrusion 820, The height h2 of the feeder pipe 600 to the inlet end of the oil absorber pipe 640 is preferably not lower than the height h2 of the gap between the feeder pipe 640 and the inlet end of the oil inflow pipe 640, At least one protrusion 821 may be formed on the outer circumferential surface of the reinforcing protrusion 820 to more effectively cancel vibration transmitted to the lower cap 110.

The reciprocating compressor including the dustproof member according to the present invention as described above is configured such that the vibration generated in the compressor body and transmitted to the casing 100, particularly the lower cap 110, It is possible to prevent the vibration noise generated by the compressor body from being discharged to the outside of the casing 100 in advance. That is, as the vibration-proof member 800 contacts the lower cap 110 and is spot-welded, the bottom surface of the casing 110 (or the lower shell 110) Fine friction is generated between the bottom surfaces of the member 800. [ This friction generates a kind of damping effect and attenuates the vibration of the compressor. Particularly, the friction between the casing 100 and the anti-vibration member 800 is maximized between the welding points, so that the vibration transmitted to the casing 100 can be more effectively attenuated. The anti-vibration member 800 may attenuate vibration noise of a desired band by using its shape, thickness, and the like. For example, the vibration in the 5 kHz band, which is the vibration of the specific band transmitted to the lower cap 110, can be effectively attenuated.

In addition, even if the by-product generated when assembling the compressor is mixed with the oil, the by-product is separated from the oil to be pumped by the reinforcing protrusion 820 of the anti-vibration member 800, Foreign matter such as welding by-products may be introduced into the gap 420 and prevent abrasion or friction loss from occurring.

On the other hand, when the reciprocating compressor according to the present invention is applied to a refrigerating machine, the efficiency of the refrigerating machine can be improved.

For example, as shown in FIG. 7, in a refrigeration apparatus 900 having a refrigerant compression refrigeration cycle including a compressor, a condenser, an expander, and an evaporator, a main substrate 910 (C) is connected to the reciprocating compressor (C), and a cylinder provided in the reciprocating compressor (C) is connected to a bottom surface of the casing as in the above-described embodiments by a vibration- Can be installed.

In this way, vibrations generated in the compressor main body and transmitted to the casing of the compressor are attenuated, thereby reducing the vibration noise of the compressor and the refrigerator using the same. In addition, byproducts generated during assembly of the compressor can be prevented from flowing into the compression unit together with the oil, thereby enhancing the reliability and efficiency of the compressor and the refrigeration apparatus using the same.

The reciprocating compressor of the present invention can be widely used in refrigeration machines such as refrigerators or air conditioners.

1 is a cross-sectional view showing a reciprocating compressor according to the present invention,

FIG. 2 is a plan view showing a bottom cap welded with an anti-vibration member in the reciprocating compressor of FIG.

FIG. 3 is a perspective view showing an anti-vibration member in the reciprocating compressor of FIG. 1,

Fig. 4 is a plan view showing the anti-vibration member according to Fig. 3,

FIG. 5 is a longitudinal sectional view showing a state where the anti-vibration member according to FIG. 1 is welded to the lower cap;

6 is a schematic view showing a refrigerating machine equipped with a reciprocating compressor according to FIG. 1;

DESCRIPTION OF REFERENCE NUMERALS

100: casing 110: bottom cap

120: upper cap 200: frame unit

300: reciprocating motor 400: compression unit

600: Oil feeder 640: Oil absorption pipe

800: Anti-vibration member 810: Reservoir hole

820: reinforcing projection 821: extension projection

Claims (9)

A casing having a closed inner space and filled with a predetermined amount of oil in the inner space; A reciprocating motor provided in an inner space of the casing and reciprocating in a straight line by the mover; A compression unit coupled to the reciprocating motor to compress the refrigerant; An oil feeder coupled to the compression unit to pump the oil in the casing to the compression unit; And And a vibration preventing member provided on a bottom surface of the casing to damp vibration, And a reservoir hole is formed on a central portion of the anti-vibration member to be in surface contact with the anti-vibration member. The method according to claim 1, Wherein the anti-vibration member and the casing are welded at least at three or more positions with a predetermined interval along the circumferential direction. The method according to claim 1, Wherein the center of the oil storage hole is formed at a position that is perpendicular to the center of the inlet end of the oil feeder when the compressor is stopped. The method according to claim 1, Wherein the oil reservoir hole of the anti-vibration member has an inner diameter larger than an outer diameter of an inlet end of the oil feeder. 5. The method of claim 4, Wherein the oil reservoir hole of the anti-vibration member is formed so that its inner diameter is not smaller than the sum of the outer diameter of the inlet end of the oil feeder and the reciprocating distance of the mover of the reciprocating motor. The method according to claim 1, And the inlet end of the oil feeder is inserted into the oil reservoir hole of the anti-vibration member when the compressor is stopped. The method according to claim 1, A reinforcing protruding portion is formed such that an edge of the anti-vibration member is spaced apart from a bottom surface of the casing by a predetermined distance, Wherein a height from a bottom surface of the casing to an upper surface of the reinforcing protrusion of the vibration-proofing member is not lower than a height from a bottom surface of the casing to an inlet end of the oil feeder. 8. The method of claim 7, Wherein at least one or more protrusions are formed on an outer circumferential surface of the reinforcing protrusion. compressor; A condenser connected to a discharge side of the compressor; An expander connected to the condenser; And And an evaporator connected to the inflator and connected to the suction side of the compressor, Wherein the compressor comprises the compressor according to any one of claims 1 to 8.

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