KR20030030777A - Recyprocating compressor - Google Patents

Abstract

PURPOSE: A reciprocating compressor is provided to prevent deterioration of efficiency of the compressor by varying resonant frequency. CONSTITUTION: A compressor includes a casing(10) having a suction tube(SP) and a discharge tube(DP); a reciprocating motor(20) fixed in the casing; a compression unit(30) installed in the casing to introduce, compress and discharge gas; a frame unit(40) supporting the reciprocating motor and the compression unit(30); a spring unit(50) elastically supporting a mover(23) of the reciprocating motor in moving direction to induce resonant movement; and a moving mass varying apparatus(100) installed between the frame unit and the spring unit(50) to vary mass of a piston(31).

Description

Reciprocating Compressor {RECYPROCATING COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor, and more particularly to a reciprocating compressor for varying the mass of a movable body to appropriately adjust the resonant frequency in accordance with operating conditions.

In general, a reciprocating compressor is a compressor in which a piston is coupled to a magnet assembly forming a mover of a reciprocating motor in place of a crank shaft, and the piston suctions and compresses and discharges a fluid while reciprocating linearly with the magnet assembly. It is a longitudinal cross-sectional view which shows an example of the conventional reciprocating compressor.

As shown in the drawing, a conventional reciprocating compressor includes a casing 10 having a suction pipe SP and a discharge pipe DP, a reciprocating motor 20 fixed inside the casing 10, and a casing ( 10, the compression unit 30, which sucks and compresses and discharges gas, the frame unit 40 supporting the reciprocating motor 20 and the compression unit 30, and the reciprocating motor 20 It is composed of a spring unit 50 for elastically supporting the mover 23 in the movement direction to induce the resonant movement.

The reciprocating motor 20 includes an outer stator 21 fixed to the frame unit 40, an inner stator 22 mounted inside the outer stator 21, an outer stator 21 and an inner stator 22. It consists of a movable member 23 for reciprocating in a straight line through the ().

The compression unit 30 is coupled to the mover 23 of the reciprocating motor 20 and fixed to the front frame 41 so that the piston 31 reciprocates together and the piston 31 is slidably inserted. Compression of the cylinder 32 and the suction valve assembly 33, which is attached to the tip of the piston 31 to limit the intake of gas while opening and closing the piston 31 to the suction flow path (F) The discharge valve assembly 34 is mounted on the discharge side of the space P to limit discharge of the compressed gas.

A spring support 51 is mounted between the mover 23 and the piston 31 of the reciprocating motor 20, and the above-described resonant springs 52 and 52 are respectively disposed on the left and right sides of the spring support 51. It is attached to support several pieces.

In the figure, F is a suction flow path.

The conventional reciprocating compressor as described above operates as follows.

That is, when power is applied to the reciprocating motor 20, a flux is formed between the outer stator 21 and the inner stator 22, and the movable member 23 placed therebetween moves along the direction of the flux. Continuously reciprocating by the resonant spring 50, with the piston 31 coupled to the mover 23 reciprocating inside the cylinder 32 changes the volume of the compression space (P) The refrigerant gas was sucked and compressed and discharged.

At this time, the resonant frequency (f _n ) of the compressor is the mass (m ₁ ) of the piston 31, which is a moving mass, the spring stiffness (k ₁ ) and the gas spring (K _gas ) of the resonant springs (51) and (51). Is given by Equation (1) below.

----------- Formula (1)

In this equation, the piston mass (m ₁ ) and the spring stiffness (k ₁ ) were determined at the time of manufacture of the compressor, and the resonance frequency once determined was not changeable.

However, in the conventional reciprocating compressor as described above, in the refrigerating and air-conditioning system equipped with the compressor, the resonance frequency f _n of the system is changed by the gas spring K _{gas that} changes according to the compressor load and the stroke of the piston 31. Due to this characteristic, the power frequency and resonant frequency do not match under different load conditions and strokes as the design is made to match the power frequency and resonant frequency only in the load conditions and strokes considered in the compressor design. There was a fear that the efficiency of.

The present invention has been made in view of the problems of the conventional reciprocating compressor as described above, and the reciprocating type that can prevent the deterioration of the compressor efficiency by varying the resonant frequency so as to be organically adapted to the load conditions and strokes that change during compressor operation. It is an object of the present invention to provide a compressor.

1 is a longitudinal sectional view showing an example of a conventional reciprocating compressor.

Figure 2 is a longitudinal sectional view showing an example of the reciprocating compressor of the present invention.

Figure 3 is a schematic diagram showing an example of a motion mass converter in the reciprocating compressor of the present invention.

4 and 5 is a longitudinal sectional view showing the main portion to explain the operating state of the reciprocating compressor of the present invention.

** Description of symbols for the main parts of the drawing **

10 casing 20 reciprocating motor

21,22: Outer, inner stator 23: Movable

30: compression unit 31: piston

32: cylinder 40: frame unit

41: Front Frame 42: Middle Frame

43: rear frame 50: spring unit

51: spring support 51a: guide member through hole

52: resonant spring 100: motion mass converter

110: first magnetic material 120: second magnetic material

120a: guide member through hole 130: motion mass guide member

140: additional mass 140a: sliding hole

In order to achieve the object of the present invention, the reciprocating motor is mounted on the frame inside the casing and the mover linearly reciprocates, the cylinder is fixed to the frame together with the reciprocating motor, and coupled to the mover of the reciprocating motor A piston that slides linearly inside the cylinder, a plurality of resonant springs coupled to the mover of the reciprocating motor to induce the mover to resonate at a constant frequency with the piston, the mover of the reciprocating motor or Between a magnetic body mounted on the piston to generate a magnetic force, a plurality of additional masses which adjust the piston's resonant frequency by varying the piston mass, which is a moving mass while being attached to the magnetic body, between the mover or piston of the reciprocating motor and the corresponding frame Reciprocating type with additional mass guide member for guiding movement of additional mass Provide a compressor.

Hereinafter, the reciprocating compressor according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

Figure 2 is a longitudinal sectional view showing an example of the reciprocating compressor of the present invention, Figure 3 is a schematic diagram showing an example of a motion mass converter in the reciprocating compressor of the present invention.

As shown in the drawing, the reciprocating compressor according to the present invention includes a casing 10 having a suction pipe SP and a discharge pipe DP, a reciprocating motor 20 fixed inside the casing 10, A compression unit (30) installed inside the casing (10) for suction and compression of gas, a frame unit (40) for supporting the reciprocating motor (20) and the compression unit (30), and a reciprocating motor (20). Spring unit 50 for elastically supporting the mover 23 in the direction of movement to induce a resonant motion, and a movement mass converter for mounting a piston mass between the frame unit 40 and the spring unit 50 to vary the piston mass. 100.

The frame unit 40 includes a front frame 41 on which the cylinder 32 is mounted, an intermediate frame 42 and a rear frame supporting the outer stator 21 and the inner stator 22 of the reciprocating motor 20. 43). The first magnetic body 110 of the motion mass converter 100 is mounted on the inner surface of the front frame 41 and one side of the intermediate frame 42.

The spring unit 50 is disposed on the left and right sides of the spring support 51 and the spring support 51 which are coupled to the mover 23 and the piston 31 of the reciprocating motor 20, respectively, the front frame 41 It consists of a plurality of resonant springs (52) (52) supporting the inner side of the side and one side of the intermediate frame (42).

The spring support 51 is formed by alternately bending a plurality of radial support in the radial direction to each of the support piece (unreference) alternately in the shape of "??" cross-section or "inverse ??" cross-section during side projection, each of the support piece (Unsigned) The second magnetic bodies 120 and 120 of the motion mass converter 100 described above are attached to both side surfaces of the ends.

In addition, the guide member through holes 51a and 120a through which the additional mass guide members 130 and 130 pass through the center of each support piece portion of the spring support 51 and the center of the second magnetic bodies 120 and 120 attached thereto. 120a are formed respectively.

The motion mass converter 100 includes a first magnetic body 110 and 110 mounted on the front frame 41 and the intermediate frame 42, and a spring support on the same axis as the first magnetic body 110 and 110. 51) The second magnetic body 120 and 120 mounted on both sides, and the spring support 51 and the guide member through-holes 51a, 120a, 120a of the second magnetic body pass through both ends of the first magnetic body. The first magnetic body 110 (slidably fitted to the additional mass guide member 130 and the additional mass guide member 130 fixed to the 110 or 110 or the front frame 41 and the intermediate frame 42 ( 110 or the second magnetic body (120, 120) is made of an additional mass (140, 140) attached to each of the magnetic material depending on whether the magnetic force is generated.

The first magnetic body 110, 110 and the second magnetic body 120, 120 are both electrically connected to a separate control unit (not shown) and to generate a magnetic force differentially depending on whether the current is applied to the control unit described above It is preferable to provide the masses 140 and 140 as electromagnets capable of adding or subtracting the moving mass by guiding them toward the spring support 51 or the frames 41 and 42.

The additional mass guide member 130 may pass through the sliding holes 140a and 140a of the additional masses 140 and 140, but may be formed in an angular cross-sectional shape so that the additional masses 140 and 140 do not rotate during the movement. have.

The additional masses 140 and 140 are formed so that the respective masses are different from each other, and form sliding holes to allow the additional mass guide member 130 to slide therethrough in the middle portion thereof, and the cross-sectional shape of the additional mass guide member It is preferable to form the same as.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

In the drawings, reference numeral 31 denotes a piston, 33 a suction valve assembly, and 34 a discharge valve assembly.

The reciprocating compressor according to the present invention as described above has the following effects.

When power is applied to the reciprocating motor 20, the movable member 23 of the reciprocating motor 20 is elastically supported by the resonant springs 52 and 52 to reciprocate together with the piston 31 to move the cylinder. A series of processes of suctioning and compressing the refrigerant gas into the interior of 32 is repeated.

Here, the natural frequency of the reciprocating compressor is large, the compressor load, while the larger the stroke of the piston 31, the natural frequency of the compressor, as is known to become small stroke to a gas spring (K _gas) increased less As the compressor The natural frequency becomes large and the compressor efficiency is lowered. Therefore, when the compressor load increases, the resonance frequency (f _n ) designed by adding the additional mass (M _add ) to the piston mass (m ₁ ) as the gas spring (K _gas ) increases as shown in Equation (2) below. Can be maintained. k ₁ is spring stiffness.

---------- Formula (2)

That is, when it is necessary to lower the natural frequency of the compressor to match the power frequency and the resonant frequency, the additional mass 140 and 140 must be combined with the piston mass m ₁ to increase the movement mass. As in the second magnetic body (120, 120) to apply a current to generate a magnetic force, which causes the appropriate additional mass 140, 140 along the additional mass guide member 130, the second magnetic body 120 ( 120 to be guided to the spring support 51 side to increase the movement mass.

On the other hand, if it is necessary to increase the natural frequency of the compressor as shown in Figure 5 by applying a current to the first magnetic body 110, 110 so that the first magnetic body 110, 110 generates a magnetic force and at the same time The additional masses 140 and 140 are separated from the second magnetic bodies 120 and 120 of the spring support 51 and guided to the first magnetic bodies 110 and 110 along the additional mass guide member 130. 41) (42) will reduce the mass of motion.

As described above, when the reciprocating compressor is mounted on the actual air conditioning system, the operating conditions inside the compressor change according to the operating condition of the air conditioning system, and the reciprocating motion is performed by organically varying the moving mass of the compressor according to the changed operating conditions. It is possible to maintain high compressor efficiency by always matching the power supply frequency and resonant frequency of the same type compressor within a certain range.

The reciprocating compressor according to the present invention is a magnetic support capable of controlling the application of magnetic force to a spring support coupled to a mover of a reciprocating motor and reciprocating together and corresponding surfaces of a front frame and an intermediate frame corresponding to the spring support. And the additional mass which is detached while moving both magnetic materials as necessary between the magnetic bodies and the magnetic bodies, and the changed operation so that the power frequency and the resonance frequency can always be matched within a certain range even if the operating conditions of the compressor change. It is possible to maintain a high compressor efficiency by organically varying the moving mass of the compressor according to the conditions.

Claims (3)

A reciprocating motor mounted on a frame inside the casing, in which the mover linearly reciprocates, A cylinder fixed to the frame with a reciprocating motor, A piston which is coupled to the mover of the reciprocating motor and slides linearly inside the cylinder, A plurality of resonant springs coupled to the mover of the reciprocating motor to induce the mover to resonate at a constant frequency with the piston; A magnetic body mounted on the mover or piston of the reciprocating motor to generate magnetic force, A plurality of additional masses which adjust a piston's resonant frequency by varying the piston mass as a moving mass while attaching and detaching to a magnetic body; A reciprocating compressor comprising an additional mass guide member mounted between a mover or piston of a reciprocating motor and a corresponding frame to guide the movement of the additional mass. The method of claim 1, A reciprocating compressor characterized in that the magnetic material is also mounted on the opposite frame with an additional mass therebetween. The method of claim 2, Magnetic material is a reciprocating compressor, characterized in that the electromagnet that can control the formation and direction of the magnetic force.