JPH10274160A - Hermetic electrically driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of efficiency of a hermetic electrically driven compressor and attenuate pulsative motion of abruptly discharged gas by forming a pass hole having a diameter smaller than that of a communication hole on a thin portion of a valve plate. SOLUTION: A cylinder head 14 having a discharge chamber 13 is fixed to a cylinder 2 through a valve plate 10. A pass hole 17 is formed on a thin portion 18 of the valve plate 10, which hole 17 is opened to a communication hole 16 communicated with the discharge chamber 13 and a muffler arranged on a cylinder block 3, and has a diameter smaller than that of the communication hole 16. The gas inside the cylinder 2 is compressed to higher the gas pressure inside the cylinder 2 than that of the discharge chamber 13. Then the compressed gas is abruptly discharged from a discharge hole 8 to the discharge chamber 13 of the cylinder head 14. Since the pass hole 17 is formed on the thin portion 18, pressure loss is the more reduced, the thinner the portion is. It is thus possible to attenuate pulsative motion of the abruptly discharged gas without deteriorating efficiency of a hermetic electrically driven compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for reducing noise of a hermetic electric compressor connected to a refrigeration cycle of an electric refrigerator or the like.

[0002]

2. Description of the Related Art In recent years, HFC-based and HC-based refrigerants containing no chlorine have been used as refrigerants for refrigeration cycles in order to prevent ozone layer destruction. DESCRIPTION OF RELATED ART Conventionally, the thing described in Japanese Patent Publication No. 5-22074 is known as a hermetic electric compressor.

FIG. 9 is a sectional view of a conventional hermetic electric compressor, in which 1 is a sealed case, 3 is a cylinder block having a cylinder 2, 4 is a piston, 10 is a valve plate having a discharge hole 8, and 14 is a valve plate. 10 via cylinder 2
A cylinder head 17 having a discharge chamber 13 fixed to the cylinder head 17 is a path having a smaller diameter than the communication hole 16 and opening to the discharge chamber 13 provided in the valve plate 10 and the communication hole 16 communicating with the muffler 15 provided in the cylinder block 3. Hole.

In the hermetic electric compressor configured as described above, when the gas in the cylinder 2 is compressed by the piston 4 and the gas pressure in the cylinder 2 becomes higher than the gas pressure in the discharge chamber 13, the compressed gas is It is discharged from the discharge hole 8 to the discharge chamber 13 of the cylinder head 14 in a short time of about 2 milliseconds. Discharge gas discharged to the discharge chamber 13 by impact is supplied to a passage hole 17 formed in the valve plate 10, a communication hole 16 formed in the cylinder block 3, and a muffler 15.
And flows to the high pressure side of the refrigeration cycle. The pass hole 17 formed in the valve plate 10 is formed to have a smaller diameter than the communication hole 16 in order to attenuate the pulsation of the discharge gas discharged in a shock.

[0005]

However, in the above-mentioned conventional structure, since the path hole is formed in the valve plate, if the diameter of the path hole is reduced, the pressure loss at that portion increases, and the discharge chamber has a large diameter. The pressure increases by the pressure loss, and the gas pressure in the cylinder also increases. For this reason, the load applied to the piston increases, and a large torque is required for the motor that reciprocates the piston, which has a problem that the efficiency of the hermetic electric compressor is deteriorated.

An object of the present invention is to solve the above-mentioned conventional problems by reducing the torque of a motor mounted on a hermetic electric compressor, and discharging the electric shock without impairing the efficiency of the hermetic electric compressor. The purpose of the present invention is to attenuate the pulsation of the discharged gas.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a valve plate having a passage hole having a diameter smaller than that of a communication hole in a thin portion of the valve plate. It is possible to attenuate the pulsation of the discharged gas that has been shockedly discharged without deterioration.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is such that a passage hole having a smaller diameter than a communication hole opened to a communication hole communicating with a muffler provided in a cylinder block is provided in a thin portion of a valve plate. Yes, since the small holes are formed in the thin portion, the length of the flow path becomes minute, and the pressure loss is generally P (pressure loss) = α (constant) × (l (length of flow path) / d (hole diameter) )) By forming a pass hole in the thin part as shown by the formula of ^0.5 , the length of the flow path is reduced and the increase in pressure loss can be controlled even if the diameter is made smaller than the pass hole of the conventional valve plate. This has the effect of attenuating the pulsation of the gas discharged from the discharge hole of the hermetic electric compressor to the cylinder head without generating a large pressure loss.

According to a second aspect of the present invention, a thin plate having a small hole having an area smaller than that of the pass hole is provided on at least one of the surfaces of the pass hole of the valve plate. Since it can be made thinner than the thin part to be formed, the length of the flow path can be made even smaller, the pulsation damping effect is further extracted, and the pulsation of the gas discharged from the discharge hole of the hermetic electric compressor to the cylinder head Is further attenuated.

According to the third aspect of the present invention, the thin plate having a small hole having an area smaller than the path hole of the valve plate is provided integrally with at least one of the discharge valve and the suction valve, so that the assembly is easily performed. This has the effect of attenuating the pulsation of the gas discharged from the discharge hole of the hermetic electric compressor to the cylinder head as in the first aspect.

According to a fourth aspect of the present invention, the volume of the pass hole of the valve plate becomes larger than the round hole shape by forming the pass hole of the valve plate into an elliptical or long hole shape, and the small hole formed in the thin plate is formed. The discharge gas squeezed by the hole can be accumulated in the elliptical or long hole-shaped valve plate of the valve plate having a larger volume than the round hole-shaped passage hole. It has the effect of further attenuating the pulsation of the gas discharged from the discharge holes of the machine to the cylinder head.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention as shown in FIG.
FIG. 3 is a sectional view taken along the arrow A in FIG.
1 is an external view around a valve plate according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a closed case, 3 denotes a cylinder block having a cylinder 2 elastically mounted in the closed case 1 and having an open end, 4 denotes a piston, and a motor 7 through a crankshaft 5 and a connecting rod 6. A reciprocating motion is performed by the rotation of. In FIG. 2, reference numeral 3 denotes a cylinder block, and 14 denotes a cylinder head having a discharge chamber 13, which is fixed to the cylinder 2 via a valve plate 10.
In the thin portion 18 of the valve plate 10, a path hole 17 having a smaller diameter than the communication hole 16 opened in the discharge chamber 13 and the communication hole 16 communicating with the muffler 15 provided in the cylinder block 3 is formed.

FIG. 3 is an exploded perspective view of the vicinity of the valve plate shown in FIG. 2. Reference numeral 10 denotes a valve plate having a thickness of 2.5 mm, and a discharge hole 8, a suction hole 9, a thin portion 18 having a thickness of 0.5 mm, and a diameter. A 1 mm pass hole 17 is machined.

FIG. 4 is a sectional view of the structure around the valve plate shown in FIGS. 1, 2 and 3, wherein 2 is a cylinder, and 14 is a cylinder head which forms the valve plate 10 and the discharge chamber 13. 4 is a piston, 10 is a valve play, and has a discharge hole 8 and a thin portion 18 having a thickness of 0.5 mm.
A millimeter pass hole 17 is machined.

With the above configuration, the gas in the cylinder 2 is compressed by the piston 4 rising in the direction of arrow B, and the compressed gas is increased when the gas pressure in the cylinder 2 is increased by the gas pressure in the discharge chamber 13. Is discharged from the discharge hole 8 into the discharge chamber 13 of the cylinder head 14 in a short time of about 2 milliseconds. After passing through the communication hole 16 and the muffler 15 discharged to the discharge chamber 13 in a shocking manner, it flows toward the high pressure side of the system. Since the pass hole 17 is formed in the thin portion 18, P (pressure loss) = α (constant) × (l (length of the flow path)
/ (D (hole diameter)) At ^0.5 , 1 (length of the flow path) = 0.5 (thickness for thin wall) d (hole diameter) = 1 (pass hole inner diameter), P (pressure loss) = 0.71α. Here, when the same calculation is performed assuming that a small hole having the same diameter of 1 mm is formed in the valve plate 10 having a thickness of 2.5 mm, P (pressure loss) = 1.6.
By forming the pass hole 17 in the thin portion 18
It is possible to reduce the pulsation of the discharge gas discharged in a shock with respect to the pressure loss of / 5 times, and to reduce the discharge hole 8 of the hermetic electric compressor.
Thus, the pulsation of the gas discharged into the discharge chamber 13 of the cylinder head 14 can be attenuated.

(Embodiment 2) FIG. 5 is an exploded perspective view around a valve plate according to one embodiment of the present invention.
Reference numeral 10 denotes a valve plate having a thickness of 2.5 mm, in which a discharge hole 8, a suction hole 9 and a pass hole 17 having a diameter of 2 mm are formed. Reference numeral 20 denotes a thin plate having a thickness of 0.15 mm, which is fixed to the valve plate 10 with a rivet 21. A small hole 19 having a smaller area than the pass hole 17 of the valve plate 10 and a diameter of 1 mm is formed.

FIG. 6 is a sectional view of the structure around the valve plate shown in FIG. 5, 2 is a cylinder, and 14 is a cylinder head attached to the valve plate 10 to form a discharge chamber 13. Reference numeral 4 denotes a piston, and reference numeral 10 denotes a valve plate in which a discharge hole 8 and a pass hole 17 are formed. 20 has a thickness of 0.
Valve plate 10 with 15 mm thin plate
1 mm diameter small holes 19 smaller than
Are formed.

With the above structure, the gas in the cylinder 2 is compressed by the piston 4 rising in the direction of arrow B, and the compressed gas is increased when the gas pressure in the cylinder 2 becomes higher than the gas pressure in the discharge chamber 13. Is discharged from the discharge hole 8 into the discharge chamber 13 of the cylinder head 14 in a short time of about 2 milliseconds. Discharge gas discharged to the discharge chamber 13 by impact is supplied to a small hole 19 formed in the thin plate 20, a pass hole 17, and a communication hole 16 formed in the cylinder block 3.
To the high pressure side of the system. Since the small holes 19 are formed in the thin plate 20, P (pressure loss) = α
(Constant) x (l (flow path length) / d (hole diameter)) ^0.5 (l (flow path length) = 0.15 (thin plate thickness) d (hole diameter) = 1 (small hole inner diameter) P (pressure loss) = 0.38
becomes α. Here, when the same calculation is performed assuming that a small hole having the same diameter of 1 mm is formed in the valve plate 10 having a thickness of 2.5 mm, P (pressure loss) becomes 1.58α, and the small hole 19 is formed in the thin plate 20. The pulsation of the discharge gas discharged by a 1 / 4-fold pressure loss can be reduced, the diameter can be made smaller than the pass hole 17 formed in the valve plate 10, and the effect of damping the large pulsation can be obtained. From the discharge hole 8 of the compressor to the cylinder head 1
The pulsation of the gas discharged to the discharge chamber 13 of No. 4 can be attenuated.

(Embodiment 3) FIG. 7 is an exploded perspective view around a valve plate according to a third embodiment of the present invention.
Reference numeral 10 denotes a valve plate having a pass hole 1 having a diameter of 2 mm.
7 has been machined. Reference numeral 22 denotes a discharge side thin plate having a thickness of 0.15 mm, and the discharge valve 11 and the valve plate 1
A small hole 19 having a diameter of 1 mm and an area smaller than that of the zero pass hole 17 is formed. Reference numeral 23 denotes a suction-side thin plate having a thickness of 0.15 mm, in which a small hole 19 ′ having a smaller area than the passage hole 17 of the suction valve 12 and the valve plate 10 having a diameter of 1 mm is formed.

With the above-described structure, the pulsation of the discharge gas discharged by impact can be greatly attenuated similarly to the second embodiment, and the discharge valve 11 is provided on the discharge-side thin plate 22.
However, since the suction valve 12 is formed integrally with the suction-side thin plate 23, the number of parts can be reduced, the assembly can be easily performed, and the discharge hole 8 of the hermetic electric compressor can be formed in the same manner as in the second embodiment.
Thus, the pulsation of the gas discharged into the discharge chamber 13 of the cylinder head 14 can be attenuated.

(Embodiment 4) FIG. 8 is an exploded perspective view around a valve plate according to one embodiment of the present invention.
Reference numeral 10 denotes a valve plate in which a pass hole 17 is formed in a long hole shape. Reference numeral 22 denotes a discharge-side thin plate having a thickness of 0.15 mm, and a small hole 19 having a diameter smaller than that of the discharge hole 11 of the discharge valve 11 and the valve plate 10 having a diameter of 1 mm.
Are formed. Reference numeral 23 denotes a suction-side thin plate having a thickness of 0.15 mm, and the suction valve 12 and the valve plate 10
A small hole 19 ′ having a smaller area than the pass hole 17 and having a diameter of 1 mm is formed.

In the same manner as in the second embodiment, the discharge gas discharged by impact as described above passes through the small holes 19 formed in the discharge-side thin plate 22 and passes through the valve plate 10.
Is discharged into the long hole-shaped pass hole 17 and again passes through the small hole 19 'formed in the suction side thin plate 23, and flows toward the high pressure side of the refrigeration cycle. Here the valve plate 10
Since the path hole 17 is formed in a long hole shape, the volume becomes large due to the perfect circular shape, and the function as an expansion chamber of the discharge gas narrowed by the small hole 19 formed in the discharge side thin plate 22 increases. Increases the pulsation damping effect. Further, the pulsation which has been attenuated once can be narrowed again by the small holes 19 'formed in the suction side thin plate 23, so that a large pulsation damping effect is drawn out and the cylinder head 14 is discharged from the discharge hole 8 of the hermetic electric compressor. Pulsation of the gas discharged into the discharge chamber 13 can be attenuated.

[0025]

As is apparent from the above embodiment, according to the first aspect of the present invention, a pass hole having a diameter smaller than that of the communication hole is formed in the discharge chamber and the communication hole communicating with the muffler provided in the cylinder block. The pressure drop is provided in the thin portion of the valve plate to suppress the increase in pressure loss, and to attenuate the pulsation of gas discharged from the discharge hole of the hermetic electric compressor to the cylinder head without generating a large pressure loss. Can be.

According to the second aspect of the present invention, machining is performed by disposing a thin plate having a small hole having an area smaller than the pass hole on at least one surface of the pass hole of the valve plate. Since the thickness can be made thinner than the thin part formed by the above, the length of the flow path can be further reduced, the pulsation damping effect can be further extracted, and the gas discharged from the discharge hole of the hermetic electric compressor to the cylinder head can be obtained. Pulsation can be further attenuated.

According to the third aspect of the present invention, the thin plate having a small hole having an area smaller than the passage hole of the valve plate is assembled integrally with at least one of the discharge valve and the suction valve. This has the effect of simplifying the man-hour and facilitating assembly, and attenuating the pulsation of the gas discharged from the discharge hole of the hermetic electric compressor to the cylinder head as in the second aspect.

According to the fourth aspect of the present invention, the passage hole of the valve plate is formed in an elliptical or long hole shape, so that the function as an expansion chamber for the discharged gas is increased, and a large pulsation damping effect is obtained. The pulsation of the gas discharged to the cylinder head from the discharge hole of the draw-out and hermetic electric compressor can be greatly attenuated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to a first embodiment of the present invention described in claim 1;

FIG. 2 is a sectional view taken along the arrow A in FIG. 1 according to the first embodiment of the present invention described in claim 1;

FIG. 3 is an exploded perspective view around a valve plate according to the first embodiment of the present invention described in claim 1;

FIG. 4 is a sectional structural view around a valve plate according to the first embodiment of the present invention described in claim 1;

FIG. 5 is an exploded perspective view around a valve plate according to a second embodiment of the present invention described in claim 2;

FIG. 6 is a sectional structural view around a valve plate according to a second embodiment of the present invention described in claim 2;

FIG. 7 is an exploded perspective view around a valve plate according to a third embodiment of the present invention described in claim 3;

FIG. 8 is an exploded perspective view around a valve plate according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a conventional hermetic electric compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed case 2 Cylinder 3 Cylinder block 4 Piston 5 Crankshaft 6 Connecting rod 7 Motor 8 Discharge hole 9 Suction hole 10 Valve plate 11 Discharge valve 12 Suction valve 13 Discharge chamber 14 Cylinder head 15 Muffler 16 Communication hole 17 Pass hole 18 Thin part 19 Small hole 19 'Small hole 20 Thin plate 21 Rivets 22 Discharge side thin plate 23 Suction side thin plate

Claims (4)

[Claims] 1. A closed case, a cylinder block having a cylinder elastically mounted in the case and having an open end, a motor for reciprocating a piston in the cylinder via a crankshaft and a connecting rod, and the cylinder A discharge plate fixed to the open end of the valve and having a discharge hole and a suction hole, a thin discharge valve and a suction valve sealing the discharge hole and the suction hole, and a discharge chamber fixed to the cylinder via the valve plate. A cylinder head having a passage hole having a smaller diameter than the communication hole, which is open to the discharge chamber and a communication hole communicating with a muffler provided in the cylinder block. A hermetic electric compressor characterized by being provided in a thin portion of a valve plate. 2. A closed case, a cylinder block having a cylinder elastically mounted in the case and having an open end, a motor for reciprocating a piston in the cylinder via a crankshaft and a connecting rod, and the cylinder A discharge plate fixed to the open end of the valve and having a discharge hole and a suction hole, a thin discharge valve and a suction valve sealing the discharge hole and the suction hole, and a discharge chamber fixed to the cylinder via the valve plate. A valve head, wherein the valve plate has a path hole that opens to the discharge chamber and a communication hole that communicates with a muffler provided in the cylinder block, and at least one of the path holes provided in the valve plate. A thin plate having a small hole having an area smaller than that of the path hole on one side surface; Dynamic compressor. 3. A closed case, a cylinder block having a cylinder elastically mounted in the case and having an open end, a motor for reciprocating a piston in the cylinder via a crankshaft and a connecting rod, and the cylinder A discharge plate fixed to the open end of the valve and having a discharge hole and a suction hole, a thin discharge valve and a suction valve sealing the discharge hole and the suction hole, and a discharge chamber fixed to the cylinder via the valve plate. A valve head, wherein the valve plate has a path hole that opens to the discharge chamber and a communication hole that communicates with a muffler provided in the cylinder block, and at least one of the path holes provided in the valve plate. A thin plate having a small hole having an area smaller than the pass hole is disposed on one of the side surfaces, and the thin plate is provided with a discharge valve. And a suction valve provided integrally with at least one of the suction valve and the suction valve. 4. A valve plate having a path hole provided in an ellipse,
4. The hermetic electric compressor according to claim 1, wherein the hermetic electric compressor is formed in a long hole shape.