JP2012225229A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of volumetric efficiency by preventing the delay of the opening timing of a suction reed valve.SOLUTION: A hermetic compressor includes: a valve plate 51 that is attached to a cylinder block 33 so as to cover an opening end of a cylinder bore 31, has an air intake hole 55 positioned inside for suctioning a refrigerant gas, and has an annularly extending valve sheet surface 53 provided at a side of the cylinder block 33 all over the air intake hole 55, and a groove 54 formed on a surface of the side of the cylinder block 33; and the suction reed valve 52 that includes a round free end 56 capable of sealing the valve sheet surface 53, has a longitudinally-formed arm part 57 provided with a bent part 59 and a holding part 58 extending laterally at both sides, and that is entirely housed in the groove 54 of the valve plate 51.

Description

  The present invention relates to a hermetic compressor used in refrigerators, showcases and other refrigeration, refrigeration apparatuses, and air conditioners.

  In recent years, electric compressors used in refrigeration cycle devices such as household refrigerator-freezers, vending machines, and air conditioners have been accelerating the movement toward energy saving due to demands for the global environment, and high efficiency is required. .

  As a conventional hermetic compressor, a configuration in which a suction reed valve is accommodated in a groove formed in a valve plate is known (see, for example, Patent Document 1).

  Hereinafter, an example of the conventional hermetic compressor will be described with reference to the drawings.

  FIG. 6 is a top sectional view showing a configuration of a conventional hermetic compressor, and FIG. 7 is a side sectional view of the hermetic compressor shown in FIG.

  6 and 7, the sealed container 101 has a suction pipe 111 and a discharge pipe 112 penetrating in the side wall portion thereof. The sealed container 101 is driven by the electric element 102 and the electric element 102. The compression element 103 and the suction muffler 104 provided in the refrigerant gas suction path of the compression element 103 are accommodated, and the lubricating oil 105 is stored in the bottom of the sealed container 101.

  The electric element 102 includes a stator 121 and a rotor 122, and is attached to the bottom of the hermetic container 101 via four springs 123 with the axial center thereof being substantially vertical. The compression element 103 includes a valve mechanism 106 including a suction valve device and a discharge valve device, a discharge chamber 107, a cylinder bore 131 and a bearing portion 132, and a cylinder block as a cylinder body fixed to the upper portion of the stator 121. 133, a piston 134 inserted in the cylinder bore 131 so as to be able to reciprocate, a main shaft portion 135 whose one end is fitted and inserted into the axial center portion of the rotor 122 of the electric element 102, and supported by the bearing portion 132, and A shaft 137 having an eccentric shaft portion 136 formed at one end thereof so as to move integrally with the main shaft portion 135, and a connecting rod 138 for connecting the eccentric shaft portion 136 and the piston 134 are provided.

  Among these components, the valve mechanism 106 is attached to the cylinder block 133 by four bolts 140 so as to cover the open end of the cylinder bore 131 together with the cylinder head 139. The discharge chamber 107 is formed inside the cylinder block 133. An oil supply mechanism 108 is provided at the lower end of the shaft 137.

  The general operation of the hermetic compressor configured as described above will be described, and then the detailed configuration and operation of the intake valve device included in the valve mechanism 106 will be described.

  The rotor 122 of the electric element 102 rotates the shaft 137, and the rotational movement of the eccentric shaft portion 136 is transmitted to the piston 134 via the connecting rod 138. As a result, the piston 134 reciprocates in the cylinder bore 131. Due to the reciprocating motion of the piston 134, the refrigerant gas is sucked into the cylinder bore 131 from the cooling system (not shown) through the suction pipe 111, the suction muffler 104 and the valve mechanism 106 and compressed, and then the valve mechanism 106. And is discharged again to the cooling system through the discharge chamber 107.

  By the oil supply mechanism 108 formed at the lower end portion of the shaft 137, the lubricating oil 105 passes through the spiral groove 109 and is pumped upward and supplied to the sliding surface between the bearing portion 132 and the main shaft portion 35. A part thereof is horizontally scattered from a discharge hole (not shown) formed at the end of the eccentric shaft portion 136 in the entire circumferential direction in the sealed container 101, and is also supplied to the piston 134 to perform lubrication. .

  8 is a cross-sectional view of the conventional valve mechanism 106 of the hermetic compressor shown in FIGS. 6 and 7, FIG. 9 is a front view of a valve plate 151 constituting the valve mechanism 106, and FIG. FIG.

  The valve plate 151 has a suction hole 155 for sucking refrigerant gas and a discharge hole 160 for discharging, and an annular valve seat surface 153 provided on the cylinder bore 131 side over the outer periphery of the suction hole 155, The suction hole 155 and the valve seat surface 153 are positioned inside, and a groove portion 154 is formed on the surface on the cylinder bore 131 side.

  The suction reed valve 152 includes a round free end 156 capable of sealing the valve seat surface 153. The arm 157 formed in a vertically long shape and the suction reed valve 152 itself include the valve plate 151 and the open end of the cylinder bore 131. It is formed by a holding portion 158 having a left-right asymmetric shape that is fixed by being sandwiched between.

  In such a hermetic compressor, the suction reed valve 152 is accommodated in the groove 154 of the valve plate 151.

Utility Model Registration No. 3078743

  However, in the conventional hermetic compressor described above, almost the entire surface of the suction reed valve 152 is in contact with the groove 154 of the valve plate 151, and the lubricating oil 105 interposed between the suction reed valve 152 and the groove 154 of the valve plate 151. Since the adhesive force acts, the opening timing of the suction reed valve 152 is delayed during suction, and the volumetric efficiency of the hermetic compressor is reduced.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a hermetic compressor with high volumetric efficiency by preventing the suction reed valve 152 from sticking to the groove 158 of the valve plate 151 during suction. There is.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention is a valve plate that is mounted on a cylinder block so as to cover an opening end of a cylinder bore and that has a suction hole for sucking refrigerant gas; A suction reed valve that opens and closes the suction hole; a cylinder block side surface of the valve plate is provided with an annular valve seat surface surrounding an outer periphery of the suction hole; and a groove portion for attaching the suction lead valve; The reed valve includes a round free end portion that seals the valve seat surface, a horizontally long holding portion that fits into the groove portion, and an arm portion that is formed in a vertically long shape and connects the free end portion and the holding portion. The groove portion surrounds the valve seat surface and is similar to the suction reed valve, and the arm portion of the suction reed valve is the groove portion. It is provided with a biasing section which biases the al spaced.

  Therefore, since the arm portion of the suction reed valve is biased in a direction away from the groove portion, the suction reed valve is less likely to receive the adhesive action of the lubricating oil and can perform an agile opening / closing operation. This operation contributes to the improvement of the volumetric efficiency of the hermetic compressor.

  The hermetic compressor of the present invention can suppress the suction reed valve from sticking to the valve plate groove during suction, and can improve the volumetric efficiency of the hermetic compressor.

Top sectional view of a hermetic compressor according to Embodiment 1 of the present invention Side surface sectional drawing of the hermetic compressor in Embodiment 1 Sectional drawing of the valve mechanism part of the hermetic compressor in the first embodiment The front view of the valve plate which comprises the valve mechanism part in Embodiment 1 Front view of a suction reed valve constituting the valve mechanism in the first embodiment Top sectional view of a conventional hermetic compressor Side sectional view of a conventional hermetic compressor Sectional view of a conventional valve mechanism Front view of conventional valve plate Front view of conventional suction reed valve

  According to the first aspect of the present invention, an electric element and a compression element driven by the electric element are accommodated in an airtight container, and the compression element is reciprocated within the cylinder bore and the cylinder bore. And a valve plate mounted on the cylinder block so as to close the opening end of the cylinder bore and provided with a suction hole for sucking refrigerant gas, and a suction reed valve for opening and closing the suction hole. The valve plate is provided with an annular valve seat surface surrounding the outer periphery of the suction hole and a groove portion for attaching the suction lead valve on the cylinder block side surface of the valve plate, and further, the suction lead valve is connected to the valve seat surface. A round free end portion to be sealed, a horizontally long holding portion that fits into the groove portion, An arm portion that connects the end portion and the holding portion; and the groove portion surrounds the valve seat surface and is similar to the suction reed valve; and the arm portion of the suction reed valve is further separated from the groove portion. An urging portion for urging in the separating direction is provided.

  By adopting such a configuration, the suction reed valve is biased in a direction away from the groove, so that it is prevented from adhering to the valve plate groove by the lubricating oil, and an agile opening / closing operation is possible. As a result, the volumetric efficiency of the hermetic compressor can be improved.

  According to a second aspect of the invention, in the invention of the first aspect, the urging portion is formed by bending the arm portion so that the free end portion is separated from the valve seat surface. Part.

  Accordingly, the separation area from the groove can be adjusted according to the adjustment of the position of the bent portion, and the decrease in efficiency due to excessive separation or insufficient separation can be eliminated.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the holding portion is formed so as to be asymmetrical with respect to the center line of the arm portion.

  With this configuration, it is possible to prevent the suction reed valve from being installed upside down when the hermetic compressor is assembled.

  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 top sectional view of a hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is a side sectional view of the hermetic compressor. 3 is a cross-sectional view of the valve mechanism portion of the hermetic compressor, FIG. 4 is a front view of the valve plate constituting the valve mechanism portion, and FIG. 5 is a front view of the suction reed valve constituting the valve mechanism portion. FIG.

  1 and 2, the sealed container 1 has a suction pipe 11 and a discharge pipe 12 penetrating through the side wall portion thereof, and the inside of the sealed container 1 is driven by the electric element 2 and the electric element 2. And a suction muffler-4 provided in the refrigerant gas suction path of the compression element 3 are disposed, and a lubricating oil 5 is stored in the bottom of the sealed container 1.

  The electric element 2 includes a stator 21 and a rotor 22, and is attached to the bottom of the hermetic container 1 through four springs 23 with the axis thereof being substantially vertical.

  The compression element 3 includes a valve mechanism 6 including an intake valve device and a discharge valve device, which will be described later, a discharge chamber 7, a cylinder bore 31 and a bearing portion 32, and serves as a cylinder body fixed to the upper portion of the stator 21. A cylinder block 33, a piston 34 inserted in the cylinder bore 31 so as to be reciprocally movable, a main shaft portion 35 that is fitted in and inserted into the axial center portion of the rotor 22 of the electric element 2 and is supported by the bearing portion 32, and A shaft 37 having an eccentric shaft portion 36 formed at one end thereof so as to move integrally with the main shaft portion 35, and a connecting rod 38 for connecting the eccentric shaft portion 36 and the piston 34 are provided.

  Among these components, the valve mechanism 6 is mounted on the cylinder block 33 by four bolts 40 so as to cover the open end of the cylinder bore 31 together with the cylinder head 39, and the discharge chamber 7 is placed inside the cylinder block 33. Is formed. An oil supply mechanism 8 is provided at the lower end of the shaft 37.

  An outline of the operation of the hermetic compressor having the above configuration will be described.

  When the electric element 2 is energized, the rotor 22 rotates the shaft 37, and the rotational movement of the eccentric shaft portion 36 is transmitted to the piston 34 via the connecting rod 38. As a result, the piston 34 reciprocates in the cylinder bore 31. Due to the reciprocating motion of the piston 34, the refrigerant gas is sucked into the cylinder bore 31 from the cooling system (not shown) through the suction pipe 11, the suction muffler 4 and the valve mechanism 6, and then compressed, and then the valve mechanism 6. And it is discharged again into the cooling system through the discharge chamber 7.

  As the shaft 37 rotates, the lubricating oil 5 is sent to the spiral groove 9 by the oil supply mechanism 8 formed at the lower end portion of the shaft 37, and is pumped upward through the spiral groove 9. The pumped lubricating oil 5 is supplied to the sliding surface between the bearing portion 32 and the main shaft portion 35 and the inside of the sealed container 1 from a discharge hole (not shown) formed at the end of the eccentric shaft portion 36. Are scattered horizontally in the entire circumferential direction and supplied to the piston 34 to lubricate the sliding portions.

Next, the suction valve device will be described. The valve mechanism 6 includes a suction valve device and a discharge valve device, which are configured to share one element. However, the discharge valve device is not directly related to the present invention, and thus the description thereof is omitted. Only the intake valve device will be described below.

  3 to 5, the valve plate 51 has a suction hole 55 for sucking refrigerant gas and a discharge hole 60 for discharging compressed refrigerant gas, and further, a cylinder bore so as to surround the suction hole 55. An annular valve seat surface 53 provided on the surface on the 31 side, and a groove portion 54 having a predetermined depth formed so as to surround the suction hole 55 and the valve seat surface 53 on the surface on the cylinder bore 31 side.

  Elements constituting the discharge valve mechanism are mounted on the surface of the valve plate 51 opposite to the cylinder bore 31, but illustration and description thereof are omitted here.

  The suction reed valve 52 constituting the suction valve device includes a round free end portion 56 that seals the valve seat surface 53, a continuous arm portion 57 that is continuous with the free end portion 56, and a suction lead. The valve 52 itself includes a valve plate 51 and a holding portion 58 formed continuously at the other end of the arm portion 57. The holding portion 58 is formed in a substantially rectangular shape extending in the left-right direction so as to be asymmetrical with respect to the center line X of the arm portion 57. Further, the arm portion 57 is provided with a bent portion 59 in which the arm portion 57 is bent so that the free end portion 56 is slightly separated from the valve seat surface 53 when the suction reed valve 52 is attached to the valve plate 51. It has been.

  Here, the groove portion 54 formed in the valve plate 51 is formed substantially similar to the shape of the suction reed valve 52 so that the suction reed valve 52 is fitted with a slight play (interval). It is set to a dimension equivalent to the plate thickness of the suction reed valve 52.

  Further, the bent portion 59 is set at a position where an appropriate spring constant is obtained so that the free end portion 56 and the arm portion 57 react quickly when the free end portion 56 is opened due to the inflow of the refrigerant gas.

  The suction reed valve 52 is sandwiched and fixed between the valve plate 51 and the cylinder bore 31 by attaching the valve plate 51 to the open end of the cylinder bore 31 with the holding portion 58 fitted in the groove portion 54. In this state, the degree of separation between the free end portion 56 of the suction reed valve 52 and the valve seat surface 53 is set such that the lubricating oil 5 forms a film with its surface tension.

  In the valve mechanism 6 configured as described above, when the piston 34 enters the suction process, when the pressure in the cylinder bore 31 decreases and becomes lower than the suction gas pressure existing in the suction hole 55, the suction reed valve 52. Open at the cylinder bore 31 side. As a result, the suction gas flows into the cylinder bore 31.

  At this time, the suction reed valve 52 is provided with a bent portion 59 that is bent toward the cylinder block 33 on the arm portion 57, so that the valve seat surface 53 of the valve plate 51 adhered by the lubricating oil 5 interposed therebetween A force acts in a direction to separate the free end portion 56 of the suction reed valve 52 and the groove portion 54 of the valve plate 51 and the arm portion 57 of the suction reed valve 52. As a result, the opening timing of the free end portion 56 of the suction reed valve 52 can be prevented from being delayed.

Further, the suction reed valve 52 repeatedly opens and closes at the natural frequency of the free end portion 56 and the arm portion 57 during the suction process (usually about 2 to 4 times). At this time, the valve seat surface 53 of the valve plate 51 and the free end portion 56 of the suction reed valve 52, and the groove portion 54 of the valve plate 51 and the arm portion 57 of the suction reed valve 52 contact each time. However, in the configuration of the first embodiment, the arm portion 57 of the suction reed valve 52 is provided with a bent portion 59 that is bent toward the cylinder block 33, and therefore, the opening timing of the free end portion 56 of the suction reed valve 52 is opened. To prevent delays.

  Therefore, the amount of intake gas flowing into the cylinder bore 31 can be increased, and the volumetric efficiency of the hermetic compressor can be improved.

  Furthermore, since the holding portion 58 of the suction reed valve 52 extends in the lateral direction (both left and right sides) and has an asymmetric shape with respect to the center line X of the arm portion 57, the holding portion 58 is formed on the valve plate 51 during assembly. Even if the suction reed valve 52 is to be attached to the groove portion 54, the arm portion 57 and the free end portion 56 cannot be inserted when the holding portion 58 of the suction lead valve 52 is inserted into the groove portion 54 of the valve plate 51. Incorrect assembly can be prevented.

  As described above, the hermetic compressor according to the present invention can be expected to be a quick opening / closing operation of the suction reed valve, and improves the volumetric efficiency of the hermetic compressor. Can be mounted over.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric element 3 Compression element 6 Valve mechanism 31 Cylinder bore 33 Cylinder block 34 Piston 51 Valve plate 52 Suction lead valve 53 Valve seat surface 54 Groove part 55 Suction hole 56 Free end part 57 Arm part 58 Holding part 59 Bending part

Claims (3)

An electric element and a compression element driven by the electric element are accommodated in an airtight container. The cylinder block having a cylinder bore, a piston that reciprocates inside the cylinder bore, and an open end of the cylinder bore And a valve plate provided with a suction hole for sucking refrigerant gas, and a suction reed valve for opening and closing the suction hole, and the cylinder block in the valve plate An annular valve seat surface that surrounds the outer periphery of the suction hole and a groove portion for mounting the suction lead valve are provided on the side surface, and the suction lead valve is further provided with a round free end portion that seals the valve seat surface. A horizontally long holding portion that fits into the groove, and a vertically long arm that connects the free end and the holding portion. The groove portion surrounds the valve seat surface and is similar to the suction reed valve, and further biases the arm portion of the suction reed valve in a direction away from the groove portion. A hermetic compressor with a section. 2. The hermetic compressor according to claim 1, wherein the urging portion is a bent portion of the arm portion formed with the arm portion such that the free end portion is separated from the valve seat surface. The hermetic compressor according to claim 1 or 2, wherein the holding portion is formed so as to be asymmetrical with respect to a center line of the arm portion.