KR100425843B1 - Apparatus for protecting cylinder defomation for compressor - Google Patents

Abstract

The present invention relates to an apparatus for preventing deformation of a cylinder of a compressor. The present invention relates to an electric mechanism unit and a casing having a compression mechanism coupled together with a rotary shaft to suck and compress a fluid, and mounted inside the casing. It includes a cylinder that forms a sealed space and accommodates the rotating body coupled to the rotating shaft to support in a radial direction, and a discharge hole that is fixed to one side of the cylinder together to form a sealed space and opened and closed by a discharge valve on one side thereof. The first bearing plate supporting the whole in the axial direction and the second bearing plate fixing together the other side of the cylinder to form a closed space and welding the outer circumferential surface to the inner circumferential surface of the casing reduce the thermal deformation of the cylinder. It is possible to prevent the leakage of refrigerant gas and thereby increase the compressor efficiency.

In addition, the sliding movement between the members can be smoothly maintained, and the support point thereof can be lowered to effectively suppress the compressor vibration and the noise caused by the compressor.

Description

Compressor Cylinder Strain Relief {APPARATUS FOR PROTECTING CYLINDER DEFOMATION FOR COMPRESSOR}

The present invention relates to an apparatus for preventing deformation of a cylinder of a compressor, and more particularly, to an apparatus for preventing deformation of a cylinder of a compressor that can reduce the deformation of a cylinder by welding heat during welding for fixing the cylinder.

In general, one of the reasons why the compressor can not improve the performance of the compressor is due to the deformation of each component during assembly or operation. In particular, deformation of the cylinder forming the closed space causes gas leakage, wear of the sliding portion, and the like, thereby degrading the compressor performance.

Therefore, in order to provide a compressor for high efficiency, low noise and low vibration, a method for minimizing deformation during assembly or operation of each member should be prepared.

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

As shown in the drawing, the conventional rotary compressor includes a stator 2 and a rotor 3 which are electric motor parts inside a casing 1 filled with a predetermined amount of oil and having a suction pipe SP and a discharge pipe DP. In the center of the rotor (3) of the rotary shaft 4 is installed, the lower portion of the rotary shaft (4) consists of a compression mechanism for suction compression of the refrigerant gas.

The compression mechanism is welded and fixed to the inner circumferential surface of the casing 1 to form a circular cylinder 5 which communicates with the suction pipe SP, and a second bearing that is in close contact with both sides of the cylinder 5 and is supported by the rotating shaft 4. The plate 6A and the second bearing plate 6B, the rolling piston 7 which eccentrically rotates in the cylinder 5 while rotating in rotation with the rotating shaft 4 and the outer circumferential surface of the rolling piston 7, It comprises a vane (shown in Figure 2) (8) for dividing the cylinder 5 into a suction space and a compression space while performing a linear movement during the pivoting movement of the piston (7).

In the figure, reference numeral 5a denotes a vane slot, 6a denotes a discharge hole, and 9 denotes a discharge valve assembly.

Operation of the conventional rotary compressor configured as described above is as follows.

That is, when power is applied to the stator 2, the rotor 3 rotates inside the stator 2, and the rotating shaft 4 rotates with the rolling piston 7 eccentrically rotating in the cylinder 5. In addition, the refrigerant gas is sucked into the suction space of the cylinder (5) in accordance with the eccentric rotation of the rolling piston (7) is continuously compressed to a constant pressure, the pressure of the compression space of the cylinder (5) passes the critical pressure of the casing (1) At the moment when the pressure is higher than the pressure in the cylinder, the discharge valve 9 mounted on the second bearing plate 6A is opened, and compressed gas is discharged into the casing 1 in the compression space, and the discharge gas is discharged from the casing 1 and the stator. (2) moved upward through the gap between the stator 2 and the rotor 3, and discharged to the refrigeration cycle system via the discharge pipe DP.

However, in the conventional rotary compressor as described above, the cylinder 5 is fixed to the casing 1 by welding. In this case, due to the heat of welding, the cylinder 5 undergoes thermal deformation as shown in FIG. As 5a) is deformed, the reciprocation of the vanes 8 is not smooth, causing leakage or abrasion of gas, thereby causing vibration / noise of the compressor.

The present invention has been made in view of the above problems of the conventional rotary compressor, and to provide a cylinder deformation preventing device of the compressor which can prevent the cylinder from deforming by welding heat when assembling the cylinder. have.

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

Figure 2 is a plan view showing a state in which the cylinder is deformed in the conventional rotary compressor.

Figure 3 is a longitudinal sectional view showing an example of the rotary compressor of the present invention.

4 is a longitudinal cross-sectional view showing an example of the portion “A” of FIG. 3 in detail;

FIG. 5 is a longitudinal sectional view showing details of a modification of the portion “A” of FIG. 3. FIG.

6 is a graph showing changes in performance and vibration when the cylinder deformation preventing device of the compressor of the present invention is mounted on a rotary compressor.

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

1: casing 5: cylinder

11: first bearing plate 12: second bearing plate

12b: welding protrusion

In order to achieve the object of the present invention, a casing having a compression mechanism coupled to the electric mechanism unit and connected to the electric shaft by a rotating shaft, and attached to the inside of the casing to form a closed space of the compression mechanism, and to the rotating shaft A cylinder for receiving and supporting the combined rotating body in the radial direction, and coupled to the upper and lower sides of the cylinder to support the rotating body in the axial direction together to form a sealed space, at least one of which is weld fixed to the inner peripheral surface of the casing Provided is a cylinder deformation preventing device of a compressor, comprising a plurality of bearing plates.

In addition, a casing having a compression mechanism coupled to the electric mechanism unit and connected to the transmission mechanism by suction shaft, and a rotating body coupled to the rotation shaft to form a closed space mounted inside the casing to form a sealed space in the casing A first bearing plate for supporting the rotating body in an axial direction by having a cylinder supporting in the direction, a discharge hole fixed to one side of the cylinder to form a closed space together and opening and closing on one side thereof by a discharge valve; It is fixed to the other side of the to provide a closed space together and provides a cylinder deformation preventing device of the compressor comprising a second bearing plate for welding the outer peripheral surface to the inner peripheral surface of the casing.

EMBODIMENT OF THE INVENTION Hereinafter, the cylinder deformation | transformation prevention apparatus of the compressor which concerns on this invention is demonstrated in detail based on one Example shown in an accompanying drawing.

Figure 3 is a longitudinal sectional view showing an example of the rotary compressor of the present invention, Figure 4 is a longitudinal sectional view showing an example of the "A" part of Figure 3 in detail, Figure 5 is a modified example of the "A" part of FIG. Longitudinal cross-sectional view shown in detail.

As shown in the drawing, the rotary compressor according to the present invention includes a casing 1 having a suction pipe and a discharge pipe, a stator 2 and a rotor 3 attached to an upper half of the casing 1 to form an electric mechanism. A cylinder 5 coupled to the rotor 13 to transmit the rotational force of the electric mechanism to the compression mechanism, a cylinder 5 positioned at the lower half of the casing 1 to form a closed space of the compression mechanism, and a cylinder ( 5) the first bearing plate 11 and the second bearing plate 12 coupled to the upper and lower sides and supporting the rotating shaft 4, and the eccentric rotation in the cylinder 5 while rotating in rotation with the rotating shaft 4; A vane for dividing the cylinder 5 into a suction space and a compression space while making a linear movement during the pivoting motion of the rolling piston 7 by contacting the rolling piston 7 and the outer circumferential surface of the rolling piston 7 (shown in FIG. 2). (8).

The cylinder 5 is formed in an annular shape and forms a vane slot (shown in FIG. 2) 5a on one side of its inner circumferential surface so that the vanes 8 can move in a radial direction, and the outer circumferential surface thereof has a casing 1 as shown in FIG. The inner circumferential surface of the) or may be spaced apart at regular intervals as shown in FIG. 5 to be wrapped and fixed in the weld protrusion 12b of the second bearing plate 12 to be described later.

The first bearing plate 11 is formed to be smaller than the inner diameter of the casing 1 so that its outer circumferential surface is spaced apart from the inner circumferential surface of the casing 1 at regular intervals, and in the center thereof, the shaft hole 11a through which the rotating shaft 4 passes. ) Is formed together with the bearing protrusions (not shown), and one side of the shaft hole (11a) is formed with a discharge hole (11b) that is opened and closed by the discharge valve assembly (9).

The second bearing plate 12 is formed to be substantially the same as the inner diameter of the casing 1 so that its outer circumferential surface is in close contact with the inner circumferential surface of the casing and can be joined by three-point welding, and at the center thereof, a shaft hole through which the rotating shaft 4 passes. (12a) is formed together with the bearing protrusion (unsigned).

In addition, as shown in FIG. 5, a weld protrusion 12b is formed at the edge of the second bearing plate 12 to increase the welding strength with the casing 1 and to accommodate the cylinder 5, or vice versa. A support protrusion (not shown) may be formed on the opposite side. Further, the outer circumferential surface of the cylinder 5 is spaced apart from the inner circumferential surface of the welding protrusion 12a of the second bearing plate 12 at a predetermined distance as shown in FIG. 5. When the welding protrusion 12a of the second bearing plate 12 is welded to the casing 1, the fixing of the welding protrusion 12a may be prevented from being deformed while the welding protrusion 12a is deformed.

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

The cylinder deformation preventing device of the compressor of the present invention as described above has the following effects.

That is, when assembling the compressor, the welding heat is directly directed to the cylinder 5 by fixing the cylinder 5 to the second bearing plate 12 and welding the second bearing plate 12 to the inner circumferential surface of the casing 1. Since the transmission is blocked, the cylinder 5 can be prevented from being deformed by the heat of welding.

In addition, since the second bearing plate 12 forms a substantially symmetrical structure without a separate discharge hole or a valve seat, the second bearing plate 12 always deforms symmetrically even if it is three-point welded, and even if asymmetrically deformed, the second bearing plate 12 is different from the position of the discharge hole. It is possible to prevent the deterioration of the compressor efficiency due to leakage of the compressed gas.

In addition, as the deformation of the cylinder 5 is suppressed to the maximum, the sliding movement between the members is smoothly performed, and as the compressor mechanism is normally operated, the suction, compression, and discharge of the refrigerant gas are stable, thereby causing abnormal vibration of the compressor. Abnormal noise caused can be suppressed.

In addition, since the position of the support point is moved to the lower side of the cylinder 5 by welding the second bearing plate 12 located below the cylinder 5 to the casing 1, the safety against the compressor vibration is increased accordingly. Can be.

In this way, it is possible to effectively reduce the thermal deformation of the cylinder to maintain a smooth reciprocating motion of the vanes in particular to prevent the leakage of refrigerant gas and thereby increase the compressor efficiency.

In addition, the sliding movement between the cylinder, the rolling piston and the vane is smoothly maintained, and the support point is lowered, thereby effectively suppressing the compressor vibration and the resulting noise.

The cylinder deformation preventing device of the compressor according to the present invention is coupled to the cylinder to form a closed space together by welding the outer peripheral surface of the bearing plate for supporting the axial direction of the rotating body to the casing, reducing the thermal deformation of the cylinder to reduce the refrigerant gas This can prevent leakage and increase compressor efficiency.

In addition, the sliding movement between the members can be smoothly maintained, and the support point thereof can be lowered to effectively suppress the compressor vibration and the noise caused by the compressor.

Claims (6)

delete delete delete A casing having a compression mechanism connected together with a power shaft and a rotating shaft connected to the power shaft to suck and compress the fluid, and mounted inside the casing to form a closed space of the compression mechanism, and accommodate a rotating body coupled to the rotation shaft in a radial direction. In the compressor comprising a support cylinder and a plurality of bearing plates coupled to the upper and lower sides of the cylinder to support the rotating body in the axial direction to form a sealed space together, Either one of the bearing plate to form a welding protrusion to receive the outer peripheral surface of the cylinder and the cylinder deformation preventing device of the compressor, characterized in that the welding outer circumferential surface of the welding protrusion to the inner peripheral surface of the casing. A casing having a compression mechanism coupled together with a power shaft to be connected to the power shaft by means of a rotating shaft, and mounted inside the casing to form an airtight space for the compression mechanism, accommodates a rotating body coupled to the rotating shaft in a radial direction. In the compressor comprising a support cylinder and a plurality of bearing plates coupled to the upper and lower sides of the cylinder to support the rotating body in the axial direction to form a sealed space together, Any one of the bearing plates protrudes to the opposite side of the cylinder to form a support protrusion for welding coupled to the inner circumferential surface of the casing. The method of claim 4, wherein The cylinder is a cylinder deformation preventing device of the compressor, characterized in that the outer peripheral surface is fixed so as to be spaced apart from the inner peripheral surface of the welding projection of the bearing plate at a predetermined interval.