JP2005180365A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient and reliable compressor having a high suction reed by reducing the torsion of the arm part of the suction reed in an intake stroke and increasing the sectional area of discharge holes. <P>SOLUTION: Three arm parts 110 of the suction reed 107 are used and the pair of discharge holes are used to secure the total width of the arm parts 110 so as to reduce the torsion of the suction reed and largely increase the total sectional area of the discharge holes. Also, the arm parts are formed in specified width shapes from a support end part 109 toward a head part 108 to increase the amount of deflection thereof near the head part of the arm head 110. Accordingly, since the sucked amount of refrigerant is increased, a refrigerating performance can be increased and stress concentration at both ends of the support end part 109 can be relieved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor used in a refrigerator, an air conditioner, a freezer / refrigerator, and the like.

  Conventionally, some compressors aiming at high efficiency and high reliability have an improved suction lead structure. (For example, refer to Patent Document 1).

  The conventional compressor will be described below with reference to the drawings.

  FIG. 4 shows a schematic diagram of a conventional compressor described in Patent Document 1. As shown in FIG.

  5 is a cross-sectional view taken along line bb ′ of FIG.

  4 and 5, a cylinder 2 is formed in the cylinder block 1, and a piston 3 is reciprocally inserted into the cylinder 2.

  A valve plate 6 is disposed at the opening end of the cylinder 2 so as to seal it, and a suction lead 7 is sandwiched between the valve plate 6 and the opening end of the cylinder 2.

  The valve plate 6 has one discharge hole 4 and one suction hole 5, and the suction lead 7 has a head portion 8 that opens and closes the suction hole 5, and a protruding portion 12 that projects from the head portion 8. The support end 9 that forms the base of the suction lead 7, the two arm portions 10 that connect the support end 9 and the head portion 8, and the cavity surrounded by the support end 9, the arm portion 10, and the head portion 8. Part 14 is formed.

  A stopper portion 13 that receives the protruding portion 12 is recessed in the inner diameter of the cylinder 2.

  The operation of the compressor configured as described above will be described below.

  The piston 3 reciprocates in the cylinder 2 to reduce the pressure in the cylinder 2 during the suction stroke, and the suction lead 7 opens to suck the refrigerant into the cylinder 2 from the suction hole 5, and the pressure in the cylinder 2 during the discharge stroke. The suction lead 7 is closed, the suction hole 5 is closed, and the refrigerant is discharged from the discharge hole 4 to the outside of the cylinder 2.

When the suction lead 7 is opened, the projecting portion 12 and the stopper portion 13 are in contact with each other to limit the deflection of the suction lead 7.
JP 2001221116 A

  However, in the above-described conventional configuration, when the suction lead 7 is displaced during the suction stroke, the suction lead 7 may be twisted and opened due to variations in adsorption force generated by refrigeration oil or the like interposed between the valve plate 6 and the like. At this time, the opening area of the suction hole 5 is biased, the flow of the sucked refrigerant becomes non-uniform, and this twist is amplified, so that the suction lead 7 is greatly deformed and may be damaged. Had.

  Further, in order to discharge the refrigerant in the cylinder 2, the discharge hole 4 must be removed and the suction lead 7 must be disposed. In order to improve the refrigeration performance of the compressor, the refrigerant can be efficiently discharged from the discharge hole 4 during the discharge stroke. When the cross-sectional area of the discharge hole 4 is increased so that the discharge hole 4 can be discharged, the area of the cavity portion 14 of the suction lead 7 needs to be increased. As a result, the width of the arm portion 10 is reduced. Stress concentration tends to occur at both ends of the support end 9, resulting in damage.

  On the other hand, in order to reduce stress concentration, the width of the arm portion 10 must be increased. However, if this is done, the cross-sectional area of the discharge hole 4 must be reduced, which has a problem that the refrigeration performance is reduced.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a compressor including a suction lead having high efficiency and high reliability.

  In order to solve the above-described conventional problems, the compressor of the present invention has a shape in which the discharge holes are paired, the suction arm is three, and the width is narrowed sequentially from the support end toward the head. Therefore, by making the discharge holes a pair, the cross-sectional area of the discharge holes can be secured and the arm portions can be provided between the discharge holes, so that the total width of the arm portions is increased, and the torsional rigidity is increased. For this reason, the suction lead can be made difficult to twist during the suction stroke, and the arm portion is made to have a narrowed shape in order from the support end to the head portion, so the spring constant of the suction lead is lowered and the suction lead is displaced. At this time, by increasing the amount of deflection on the head side of the arm portion, the opening area of the suction hole can be increased, so that the refrigerant can be easily sucked from the suction hole and the amount of deflection at the support end can be suppressed. Both ends Has the effect of the stress concentration can be relaxed.

  Since the compressor of the present invention can secure the amount of deflection while making it difficult to twist when the suction lead opens, it is possible to provide a compressor equipped with a highly efficient and highly reliable suction lead.

  According to a first aspect of the present invention, a cylinder formed in a cylinder block, a piston reciprocally inserted into the cylinder, a suction hole and a pair of discharge holes provided at an opening end of the cylinder are provided. And a suction lead that is sandwiched between the valve plate and the opening end of the cylinder and formed of a leaf spring material, the suction lead opening and closing the suction hole, A support end that forms a base portion of the suction lead, and three arm portions that connect the support end portion and the head portion, and the arm portions have a width sequentially from the support end portion toward the head portion. Since there are three arm parts, the total width of the arm parts is increased and the torsional rigidity is increased, so that the suction lead is difficult to twist during the suction stroke. Prevent deformation and damage of over de. Further, since the discharge holes are paired, the cross-sectional area of the discharge holes can be secured and the circulation amount of the refrigerant can be increased, so that the refrigeration performance does not deteriorate. Furthermore, the spring constant of the suction lead is achieved by reducing the stress concentration at both ends of the support end by reducing the amount of deflection at the support end by reducing the width of the arm from the support end toward the head. Since the amount of deflection on the arm head side can be increased and the refrigerant can be sucked easily, a compressor having a highly efficient and reliable suction lead can be provided.

  According to a second aspect of the present invention, in addition to the first aspect, the outer periphery of the suction lead is formed by a slit having substantially the same width, and the slit side of the arm portion is formed in a substantially linear shape. Therefore, since the volume of the slit is reduced and the clearance volume is reduced, the re-expansion loss is reduced, and a compressor having a highly efficient suction lead can be provided.

  In addition to the invention described in claim 1 or 2, the invention described in claim 3 is formed by forming a protruding portion in the head portion and recessing a stopper portion that receives the protruding portion on the inner diameter of the cylinder. Since the amount of displacement of the suction lead is suppressed, the stress concentration generated on the support end side of the arm portion can be alleviated, and a compressor having a highly reliable suction lead can be provided.

  According to a fourth aspect of the invention, in addition to the invention according to any one of the first to third aspects, a portion of the opening end of the cylinder facing the support end is inclined in the deflection direction of the suction lead. The relief constant is reduced and the length of the suction lead is increased, so the spring constant is lowered and the lead is flexed more flexibly to reduce the occurrence of stress concentration and to make the compressor more reliable. Can be provided.

  According to a fifth aspect of the present invention, in addition to the first aspect of the present invention, the inclination angle of the escape portion is made larger than the deflection angle of the suction lead, and the vicinity of the support portion Since the cylinder block does not come into contact with the cylinder block, it is possible to provide a compressor having a more reliable suction lead.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic diagram of a compressor according to an embodiment of the present invention.

  FIG. 2 is a cross-sectional view taken along the line aa ′ of FIG.

  FIG. 3 is a schematic cylinder block diagram of the compressor according to the embodiment of the present invention.

  1 and 2, a cylinder 102 is formed in a cylinder block 101, and a piston 103 is reciprocally inserted into the cylinder 102. A suction hole 105 and a pair of discharge holes 104 are formed in a valve plate 106 disposed so as to seal the opening end of the cylinder 102.

  A suction lead 107 formed of a leaf spring material is sandwiched between the valve plate 106 and the open end of the cylinder 102. The suction lead 107 includes a head portion 108 that opens and closes the suction hole 105, a support end portion 109 that forms the base of the suction lead 107, and three arm portions 110 that connect the support end portion 109 and the head portion 108. Has been. The arm portion 110 is formed outside the discharge hole 104 and has a shape in which the width is gradually reduced from the support end portion 109 toward the head portion 108. The total width of the three arm portions 110 on the support end 109 side is about ½ of the width of the suction lead 107 in this portion. The entire circumference of the suction lead 107 is extracted by a slit 111 having the same width, and both outer sides including the arm portion 110 are formed substantially in a straight line. In addition, a protruding portion 112 protrudes from the head portion 108.

  A stopper portion 113 for receiving the protruding portion 112 is recessed in the inner diameter of the cylinder 102, and the opening end portion of the cylinder 102 is positioned at a position corresponding to the support end portion 109 of the suction lead 107 in the deflection direction of the suction lead 107. An inclined escape portion 114 is provided. The inclination angle of the escape portion 114 is larger than the deflection angle of the suction lead 107.

  About the compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As the piston 103 reciprocates in the cylinder 102, the pressure in the cylinder 102 decreases during the intake stroke, and the intake lead 107 opens to suck the refrigerant into the cylinder 102 from the intake hole 105. During the discharge stroke, the pressure in the cylinder 102 increases and the suction lead 107 closes the suction hole 105, and the refrigerant is discharged from the discharge hole 104 to the outside of the cylinder 102 via a discharge valve (not shown). When the suction lead 107 is opened, the protrusion 112 comes into contact with the stopper portion 113 to limit the deflection of the suction lead 107.

  When the sucked refrigerant has a high density, the load applied to the suction lead 107 by the refrigerant becomes large, and the suction lead 107 receives a large load from the sucked refrigerant even after the protrusion 112 and the stopper portion 113 are in contact with each other. Overall deflection increases. At this time, since the width of the arm portion 110 is narrower from the support end portion 109 toward the head portion 108, the deflection amount on the head portion 108 side is relatively smaller than that on the support end portion 109 side of the arm portion 110. Become bigger.

  As a result of an increase in deflection on the head side of the arm portion 110, the amount of deflection at the support end 109 can be kept small, and stress concentration at the support end 109 can be reduced.

  Further, by increasing the amount of deflection on the head part side of the arm part 110, the opening of the suction lead 107 at the position facing the suction hole 105 is increased, and the opening area of the suction hole 105 is increased, so that the refrigerant is sucked. It becomes easy to do. Thereby, the refrigerating capacity of the compressor can be improved.

  Further, since there are three arm portions 110, the total width of the arm portions 110 can be increased to about 1/2 with respect to the width of the suction lead 107 of this portion. At the time of displacement, the suction lead 107 is twisted due to variations in adsorption force. However, since the torsional rigidity is increased, the amount of twist is reduced, and the deformation and breakage of the suction lead 107 due to twisting are less likely to occur.

  Further, since the escape portion 114 has an inclination angle larger than the deflection angle of the suction lead 107, it is possible to avoid contact with the edge of the cylinder 102 when the suction lead is bent during the suction stroke. For this reason, stress concentration caused by contact between the edge of the cylinder 102 and the support end 109, fatigue deformation starting from deformation of the suction lead 107, and contact damage do not occur, and reliability can be improved. Further, assuming that the suction lead 107 is substantially the entire length from the support end 109 to the tip of the projection 112, the projection 112 becomes the substantial length of the suction lead 107 from the base of the escape portion 114, and the entire length can be earned. The stress generated for the same deflection amount is reduced, and the reliability of the compressor can be improved.

  On the other hand, when the piston 103 reaches the position of the top dead center, the space formed by the valve plate 106, the inner wall of the cylinder 102 and the piston 103 is called a clearance volume, and the compressed refrigerant remains in the clearance volume and cannot be discharged completely. Since it remains inside the cylinder 102, it re-expands in the intake stroke, so that a substantial amount of refrigerant sucked decreases, which contributes to a decrease in refrigeration capacity. However, in this embodiment, since the width of the slit 111 is substantially the same and both outer sides including the arm portion 110 are formed in a substantially straight line, the volume of the entire slit 111 is small. As a result, a decrease in refrigeration capacity can be kept small, and the efficiency of the compressor can be improved.

  As described above, according to this embodiment, a compressor having a highly efficient and highly reliable suction lead can be obtained.

  As described above, the compressor according to the present invention makes it possible to obtain a compressor having a highly efficient and highly reliable suction lead, so that refrigerant compression used in a refrigerator, an air conditioner, a refrigerator-freezer, etc. In addition to the machine, it can also be applied to valve structures such as vacuum pumps and air compressors.

Schematic of the compressor in the embodiment of the present invention Aa 'sectional view of FIG. Schematic block diagram of a compressor in an embodiment of the present invention Schematic diagram of a conventional compressor Bb 'sectional view of FIG.

Explanation of symbols

101 Cylinder block 102 Cylinder 103 Piston 104 Discharge hole 105 Suction hole 106 Valve plate 107 Suction lead 108 Head part 109 Support end part 110 Arm part 111 Slit 112 Projection part 113 Stopper part 114 Escape part

Claims (5)

A cylinder formed in a cylinder block; a piston inserted reciprocally into the cylinder; a valve plate provided at an opening end of the cylinder and having a suction hole and a pair of discharge holes; and the valve plate And a suction lead formed by a leaf spring material. The suction lead has a head part that opens and closes the suction hole, and a support end part that forms a base part of the suction lead. And three arm portions that connect the support end portion and the head portion, and the arm portion has a shape in which the width is gradually reduced from the support end portion toward the head portion. 2. The compressor according to claim 1, wherein the suction lead is formed by extracting the outer periphery with a slit having substantially the same width, and the slit side of the arm portion is formed in a substantially linear shape. The compressor according to claim 1 or 2, wherein a protruding portion is formed in the head portion, and a stopper portion that receives the protruding portion is recessed in an inner diameter of the cylinder. The compressor according to any one of claims 1 to 3, wherein a relief portion inclined in the deflection direction of the suction lead is provided in a portion of the opening end portion of the cylinder that faces the support end portion. The compressor according to any one of claims 1 to 4, wherein an inclination angle of the escape portion is set to be larger than a deflection angle of the suction lead.

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