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Reciprocating compressor having supporting unit attentuating lateral displacement thereof

Reciprocating compressor having supporting unit attentuating lateral displacement thereof description/claims

The present invention relates to a reciprocating compressor having a supporting unit attenuating its lateral displacement, and more particularly, to a reciprocating compressing having a supporting unit attenuating its lateral displacement capable of minimizing lateral vibration of a compressor, which is generated in a direction that a reciprocating motor is operated in operation of the reciprocating compressor.

In general, a reciprocating compressor constitutes an air conditioning device, sucks a refrigerant gas thereinto and discharges the compressed refrigerant gas outside the compressor as a piston linearly reciprocates in a cylinder.

As shown in FIG. 1, a conventional reciprocating compressor includes a casing 10 forming an exterior, having a certain space therein and including a suction pipe (SP) through which a refrigerant gas is introduced and a discharge pipe (DP) through which the refrigerant gas compressed in the compressor is discharged outside; a compressor main body 70 positioned in the casing 10, for compressing the sucked refrigerant gas; and a supporting unit 60 having a plurality of coil springs elastically connecting the compressor main body 70 to one surface of the casing 10 so that the main body 70 is fixed to the casing 10.

The main body 70 of the compressor includes a frame unit 20 elastically connected to the supporting unit 60 and forming the whole frame of the main body 70; a reciprocating motor 30 fixedly installed at the frame unit 20 and generating a linear reciprocating driving force; and a compressing unit 40 supported at the frame unit 20 and compressing the sucked refrigerant gas by a driving force of the reciprocating motor 30.

The frame unit 20 includes a front frame 21 having one surface supported by the supporting unit 60 and fixing one surface of the reciprocating motor 30; a middle frame 22 fixed at the other surface of the reciprocating motor 30 fixed at the front frame 21; and a rear frame 23 having one surface elastically fixed by the supporting unit 60 and connected to the middle frame 22.

The reciprocating motor 30 includes an outer stator 31 fixedly installed between the front frame 21 and the middle frame 22 and having a winding coil 34 therein; an inner stator 32 facing the outer stator 31 at a certain interval and fixedly installed at one side of the front frame 21; and a rotor 33 linearly moving between the outer stator 31 and the inner stator 32.

The compressing unit 40 includes a cylinder 41 inserted into the front frame 21 to be fixed thereto; a piston 42 having a path (F) for a refrigerant gas therein and having one end connected to the rotor 33 to thereby reciprocate in the cylinder 41; a suction valve 43 installed at a front end surface of the piston 42, for opening and closing the refrigerant gas path (F); and a discharge valve assembly 44 installed at one end surface of the cylinder 41, for controlling discharge of the compressed refrigerant gas. A compressing space (P) is formed between the suction valve 43 and the discharge valve assembly 44.

Here, a front resonant spring 51 and a rear resonant spring 52 causing a resonant motion of the piston 42 are installed between one end of the piston 42 connected to the rotor 33 and one end of the front frame 21 and between the one end of the piston 42 and one end of the rear frame 23, respectively.

A plurality of coil springs constituting the supporting unit 60 includes a front coil spring 61 connecting the front frame 21 to one surface of the casing 10; and a rear coil spring 62 connecting the rear frame 23 to one surface of the casing 10, so that the main body 70 is elastically fixed to the inside of the casing 10.

As shown in FIGS. 1 and 2A, the plurality of oil springs 61 and 62 are formed by being spirally wound several times at regular intervals, having the same diameter. That is, the coil spring 61, 62 has an inner coil 58 wound plural times and end coils 59 formed at both ends of the inner coil 58.

The inner coil 58 is wound at regular pitches (t), and each of the end oils 59 is tightly wound so that the coil spring 61, 62 can be fixed to one surface of the compressor main body 70—the front frame 21 and the rear frame 23—and one surface of the casing 10

The conventional reciprocating compressor as described above is operated as follows.

When a current is applied to a winding coil 34 of an outer stator 31 of a reciprocating motor 30, an induction magnetic field having a direction changed according to a direction of a current is formed at the outer stator 31, and an electromagnetic force having a direction changed according to a direction of the induction magnetic field is generated between the outer stator 31 and the inner stator 32 by the interaction between the induction magnetic field and a magnetic filed of the inner stator 32. Here, a rotor 33 and a piston 42 are moved together in a direction of the electromagnetic force, and, simultaneously, the piston 42 generates a pressure difference in a compressing space (P) of the cylinder 41 while linearly reciprocating in the cylinder by front and rear resonant springs 51 and 52, thereby repeatedly performing a series of processes of sucking a refrigerant gas and compressing the sucked refrigerant gas until the pressure reaches a certain level and discharging the compressed refrigerant gas.

When the compressor passes through the processes of sucking and discharging a refrigerant gas by an operation of the reciprocating motor, vibration is generated at the main body. Such vibration of the compressor main body is reduced by a supporting unit including a plurality of coil springs having regular pitches, and thus noise and vibration transmitted to the casing of the compressor is reduced, too.

However, the conventional reciprocating compressor as above is mostly vibrated in a lateral direction by nature, that is, in a direction that the piston of the reciprocating motor moves. Nevertheless, the lateral stiffness of the oil spring is weak because an internal oil of each coil spring for supporting the main body of the reciprocating compressor is formed at regular pitches. For this reason, as shown in FIG. 2B, a lateral displacement (L) of the compressor becomes great, and thus the compressor main body is excessively inclined, thereby making the vibration of the compressor severe.

Therefore, it is an object of the present invention to provide a reciprocating compressor having a supporting unit attenuating a lateral displacement capable of minimizing lateral vibration of a compressor, which is generated in a direction that a reciprocating motor is operated when the reciprocating compressor is in operation.

To achieve the above object, there is provided a reciprocating compressor comprising: a casing including a suction pipe through which a fluid is introduced from the outside and a discharge pipe through which the fluid is discharged outside and forming a predetermined internal space; a compressor main body positioned in the casing, compressing the fluid introduced through the suction pipe by a linear reciprocating motion of a piston and discharging the compressed fluid through the discharge pipe; and a supporting unit including a plurality of coil springs connecting the compressor main body to the casing, wherein the plurality of coil springs include, respectively, end coils tightly wound to be fixed to one surface of the compressor main body and to one surface of the casing; and an inner coil positioned between the pair of the end oils and having at least one part wound tightly.

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