KR20040080462A - Compression coil spring and reciprocating compressor with this - Google Patents

Abstract

PURPOSE: A compression coil spring and a reciprocating compressor with the compression coil spring are provided to minimize the rotating moment produced during compression. CONSTITUTION: A compression coil spring(C) has protrusions(110) formed to the peripheral surface of the outermost wire rod(N1) opposed to an adjoining wire rod(N2). The protrusion comprises a contact surface projecting from the end of the outermost wire rod at a predetermined rake angle and coming in contact with the adjoining wire rod, and a separation surface formed from the end of the contact surface to the outer peripheral surface of the outermost wire rod and always separated from the adjoining wire rod.

Description

Compression coil springs and reciprocating compressors having the same {COMPRESSION COIL SPRING AND RECIPROCATING COMPRESSOR WITH THIS}

The present invention relates to a compression coil spring, and more particularly, to a compression type coil spring and a reciprocating compressor having the compression coil spring, which can maintain a clearance between the wire rod and the wire rod to block the transmission path of the rotation moment.

The spring is a mechanical element whose main purpose is to use elasticity in a broad sense, and may be classified into a coil spring, a leaf spring, a torsion bar, and the like according to its shape.

Coil springs are relatively inexpensive to manufacture, and in particular, the use of a dedicated molding machine can further reduce the price, and the operation of the coil spring is highly used for various machines due to its high reliability and small size and light weight.

In addition, the coil spring is straightened by passing a circular or rectangular wire rod through a straightener, and then manufactured at a desired bending angle by using a forming tool positioned by a servomotor or a cam.

As the coil spring is wound in a spiral form, particularly in the case of compression coil springs, the repulsive force against the load is clockwise or counterclockwise as the outermost wire and the second wire contacting the wire contact along the trajectory wound at the end. It is accompanied by so-called rotation moments that occur in succession.

That is, in the conventional compression coil spring as in FIGS. 1 to 3, the coil spring C is formed by spirally winding the wire rod 1 having the same wire diameter so as to have the same diameter.

Here, the axial outer surface of the outermost wire (N1) is cut to arrange the coil spring (C) perpendicular to the support surface to form a flat surface (1a), the axial inner surface is the inclination angle (α) of the wire wound Is formed in the inclined surface 1b.

As described above, the conventional compression coil spring is wound around the wire rod 1 in a spiral form as described above, while the outermost wire rod N1 and the second wire rod N2 contacting the wire rod 1 are wound along the trajectory of the end. And a continuous moment of contact (① → ② → ③ → ④ → ⑤ → ..ⓝ) as shown in FIG. 3 and generates a rotation moment due to the repulsive force against the load, and the coil spring C is supported by the rotation moment. There was a problem that the support surface was worn while rotating relative to.

The present invention has been made in view of the problems of the conventional compression coil spring as described above, to provide a compression coil spring and a reciprocating compressor having the compression coil spring that can minimize the rotation moment generated during compression. There is a purpose.

1 is a front view showing an example of a conventional coil spring,

2 and 3 is a schematic view showing a twisting phenomenon in the compression of the conventional coil spring,

4 is a front view showing an example of the coil spring of the present invention;

5 is a cross-sectional view taken along line "I-I" of FIG. 4;

Figure 6 is a schematic view showing a torsional blocking phenomenon during compression of the coil spring of the present invention from the front,

7 is a detailed view showing part “A” of FIG. 6;

8 is a schematic view showing a torsional blocking phenomenon during compression of the present invention coil spring from the bottom,

9 is a longitudinal sectional view showing an example of a reciprocating compressor to which the present invention coil spring is applied;

10 is a schematic view showing in detail the operating state of the coil spring of the present invention.

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

20: frame unit 30: reciprocating motor

33: mover 40: compression unit

42: piston 50: resonant spring unit

51: front side resonance spring 52: rear side resonance spring

51a, 52a: protrusion 100: coil spring

110: protrusion 111: contact surface

112: separation plane 113: connection plane

N1: outermost wire rod N2: second wire rod

In order to achieve the object of the present invention, in the coil spring, there is provided a coil spring, characterized in that forming a protrusion at a predetermined height on the outer peripheral surface of the outermost wire rod facing the neighboring wire rod.

A reciprocating motor, which is supported by the frame and moves linearly by the mover, a cylinder fixed to the frame, a piston which is connected to the mover of the reciprocating motor and linearly reciprocated in the cylinder, and fixed to the end surface of the piston A suction valve which opens and closes the suction flow path of the piston, a discharge valve detachably disposed on the front end surface of the cylinder so as to form a compression space opposite the suction valve, and to move the piston and the mover of the reciprocating motor. In a reciprocating compressor including a resilient spring that supports elasticity, the resonant spring spirally winds the rigid wire rod and forms a protrusion at a predetermined height on the outer circumferential surface of both outermost wire rods or the corresponding outer circumferential surface of the wire rod. Provide a compressor.

Hereinafter, the compression coil spring according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

Figure 4 is a front view showing an example of the coil spring of the present invention, Figure 5 is a "I-I" cross-sectional view of Figure 4, Figure 6 is a schematic view showing the torsion blocking phenomenon during compression of the coil spring of the present invention from the front, 7 is a detailed view showing part "A" of FIG. 6, FIG. 8 is a schematic view showing a torsional blockage phenomenon during compression of the coil spring of the present invention, and FIG. 9 shows an example of a reciprocating compressor to which the coil spring of the present invention is applied. Longitudinal section.

As shown in the drawing, the compression coil spring C according to the present invention spirally wounds the wire rod 100 having the same wire diameter to have the same diameter, but has a predetermined height on the inner circumferential outer circumferential surface of both outermost wire rods N1. By forming a protrusion 110.

As shown in FIG. 7, the protrusion 110 protrudes at an inclined angle from the end of the outermost wire rod N1 to contact the neighboring wire rod N2 and the outermost wire rod at the end of the contact surface 111. It is formed to be lowered to the outer circumferential surface of N1) and is composed of a separation surface 112 that is always spaced apart from the neighboring wire (N2).

In addition, the protrusion 110 may be formed at regular intervals such that the contact surface 111 is in contact with the neighboring wire rod N2 continuously at the end when compressed, or the contact surface 111 is always in contact with the neighboring wire rod N2. do.

In addition, the protrusion 110 is formed in the same way as the curvature of the wire rod 100 as shown in Figure 5, the wire rod of the portion having the protrusion 110 is preferably formed in a rectangular cross-section of a similar oval shape.

In addition, it is preferable that the contact surface 111 of the protrusion 110 and the connection surface 113 of the separation surface 112 are formed to be curved at a predetermined curvature as shown in FIG. 7 in order to prevent cracks during fabrication or operation of the spring. Do.

In addition, the protrusion 110 is formed so that the connecting surface 113 between the contact surface 111 and the separation surface 112 is located within about 360 ° in the wound direction of the wire rod when the reference to the end of the wire rod, approximately 90 It is preferable to form so that the peak O may be located in the vicinity.

The coil spring of the present invention as described above has the following effects.

That is, in the case where the upper and lower ends of the coil spring C are supported by a structure (not shown) and then the structure is pressed to compress the coil spring C, the coil spring C is wired 100 as described above. ), The outermost wire (N1) and the second wire (N2) in contact with it are continuously contacted along the trajectory wound at the end, forming a rotation moment with the repulsive force against the load that presses the structure. The coil spring C tries to rotate with respect to the supporting surface due to the rotation moment, but the coil spring C of the present invention has a predetermined height on the inner circumferential surface of the outermost wire N1 as shown in FIGS. 4 and 5, respectively. As the protrusion 110 is provided, the contact surface of the protrusion 110 continuously contacts (① → ② → ③) with the outer circumferential surface of the neighboring wire N2 as shown in FIG. 8, and then the critical point O, that is, the protrusion 110. Contact surface 111 and the spaced apart surface 112 of As shown in FIGS. 6 and 7, when the outermost wire N1 and the next wire N2 are no longer in contact with each other, the load of the structure is along the winding direction of the wire 100. By blocking the continuous transmission it can reduce the rotation moment of the coil spring (C).

In this way, when compressing both ends of the coil spring, it reduces the rotational moment that the coil spring tries to rotate during repeated compression and extension, thus preventing the coil spring from rotating against the support surface and thus preventing wear between the two contact surfaces. Can be.

On the other hand, when the coil spring according to the present invention is applied to a reciprocating compressor is as follows.

9 is a longitudinal sectional view showing an example of a reciprocating compressor to which the coil spring of the present invention is applied, and FIG. 10 is a schematic diagram showing an operation state of the coil spring of the present invention in detail.

That is, the reciprocating compressor to which the coil spring of the present invention is applied to the resonant spring includes a casing 10 communicating with the gas suction pipe SP and the gas discharge pipe DP and elastically supported inside the casing 10. A piston 42 is attached to the frame unit 20, the reciprocating motor 30, which is supported by the frame unit 20, and the mover 33 linearly reciprocates, and the mover 33 of the reciprocating motor 30. Compression unit 40 for compressing the refrigerant gas while linearly reciprocating together by connecting and elastically supporting the mover 33 of the reciprocating motor 30 and the piston 42 of the compression unit 40 to induce resonance motion. It includes a resonant spring unit 50 having a plurality of resonant springs (51, 52).

The reciprocating motor 30 has a plurality of outer stators 31 for attaching a plurality of lamination sheets to an annular power supply coil and stacking them in a cylindrical shape, and a plurality of sheets for insertion into the outer stators 31 to form a flux. The inner stator 32 for laminating the lamination sheet in a cylindrical shape, and disposed between the outer stator 31 and the inner stator 32 and provided with a plurality of magnets in the flux direction of the two stators 31 and 32 described above. It consists of a mover 33 for reciprocating in a straight line.

The compression unit 40 is coupled to the mover 33 of the cylinder 41 and the mover 33 of the reciprocating motor 30 together with the stators 31 and 32 of the reciprocating motor 30. A piston 42 reciprocating in a straight line at 41, a suction valve 43 coupled to open and close the suction channel 42a of the piston 42, and a discharge gas of the cylinder 41, A discharge valve assembly 44 to limit discharge.

The resonant spring unit 50 is elastically arranged on both sides of the connecting portion of the mover 33 and the piston 42 to induce the resonant movement of the piston 42 and the front resonant spring 51 and the rear resonant spring. Consists of 52.

The front side resonant spring 51 is fixed at one end to the front surface of the connecting portion, while the other end is fixed to the rear surface of the corresponding front frame 21. In addition, one end of the rear resonance spring 52 is fixed to the rear surface of the connecting portion, while the other end is fixed to the corresponding rear frame 23.

Both the front resonant spring 51 and the rear resonant spring 52 are compression coil springs spirally wound around a rigid spring wire and are in contact with the next wire N2 when compressed on the outer circumferential surface of both outermost wires N1. Protruding portions (51a) (52a) to limit the to form a predetermined height.

In the drawing, reference numeral 22 denotes an intermediate frame.

Effects of the reciprocating compressor having a resonant spring of the present invention as described above are as follows.

That is, when power is applied to the outer stator 31 of the reciprocating motor 30, a flux is formed between the outer stator 31 and the inner stator 32 so that the movable element 33 and the piston 42 together flux. While moving left and right along the direction of the reciprocating motion in a straight line by the resonant spring unit 50, with the piston 42 reciprocating in a straight line inside the cylinder 41, the compression space of the cylinder 41 ( By generating a pressure difference in P), a series of processes are repeated in which the refrigerant gas is sucked in, compressed to a predetermined pressure, and then discharged.

Here, the front resonant spring 51 and the rear resonant spring 52 constituting the resonant spring unit 50 alternately compress and expand the resonator to move the actuator 33 and the piston 42. The above-described movers are formed by forming the protrusions 51a and 52a as described above in the outermost wire N1 of the two resonant springs 51 and 52 to prevent rotation of the respective resonant springs 51 and 52. The connection between the 33 and the piston 42 is prevented from being worn by the two resonant springs 51 and 52, thereby increasing the reliability of the compressor.

The coil spring and the reciprocating compressor having the same according to the present invention form a protrusion on the inner circumferential surface of the outermost wire of the coil spring, thereby preventing the reaction force against load from being continuously transmitted to the neighboring wire, thereby rotating the coil spring. The moment can be reduced and this effectively reduces the wear between the coil spring and the support surface supporting it.

In addition, by using the coil spring as a resonant spring for supporting the connection part between the mover and the piston of the reciprocating compressor, the connection between the mover and the piston is prevented from being damaged by the resonant spring when the compressor is driven, thereby improving the reliability of the compressor. Can be.

Claims (6)

In the coil spring, A coil spring, characterized in that a protrusion is formed at a predetermined height on the outer circumferential surface of the outermost wire rod facing the neighboring wire rod. The method of claim 1, The protruding portion is formed of a contact surface which protrudes at a predetermined inclination angle from the end of the outermost wire rod to contact with the neighboring wire rod, and is formed to be lowered from the end of the contact surface to the outer circumferential surface of the outermost wire rod, so as to be spaced apart from the neighboring wire rod. A coil spring characterized by the above. The method of claim 2, The connection surface of the contact surface and the separation surface is a coil spring, characterized in that to form a curved surface with a predetermined curvature. The method of claim 1, Protruding portion is a coil spring characterized in that the contact surface is formed so as to continuously contact from the end during compression with the neighboring wire. The method according to any one of claims 1 to 4, Protruding portion of the coil spring, characterized in that the apex is formed so as to be located within 360 ° in the winding direction of the wire rod relative to the end of the outermost wire rod. A reciprocating motor in which the mover linearly reciprocates while supporting the frame, a cylinder fixed to the frame, a piston reciprocating linearly in the cylinder by connecting to the mover of the reciprocating motor, and fixed to the end surface of the piston. An intake valve for opening and closing the inlet flow path of the piston, a discharge valve detachably disposed on the front end surface of the cylinder so as to form a compression space opposite the intake valve, and elastic support for resonating the mover and the piston of the reciprocating motor. In a reciprocating compressor including a resonant spring, The resonant spring is a reciprocating compressor characterized in that the rigid wire is wound in a spiral form on the outer circumferential surface of both outermost wire rod or the outer circumferential surface of the wire rod corresponding thereto to form a protrusion at a predetermined height.