JPH10318146A - Hermetic electrically driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce closing delay of a delivery lead valve, by making easy separating of the delivery lead valve from the contact surface of a stopper by forming a groove in a contact surface between the stopper and the delivery lead valve. SOLUTION: A plurality of grooves 16 which cross each other are formed on a contact surface between a stopper 15 and a delivery lead valve 10 using a die of a die-cast. In a compressing process, the stopper 15 presses the delivery lead valve 10, and the delivery lead valve is adhered on the stopper 15 through a lubricating oil on their contact surface. A refrigerant gas in a delivery chamber enters crossed grooves 16, therefore, an oil film of the lubricating oil for adhesion is broken, the oil film on the contact surface is easy to be cut, the delivery lead valve 10 separates from the stopper 15, and a delivery hole 17 is sealed. Thus, closing delay of a delivery lead valve 10 is reduced, the period when a high-pressure refrigerant gas in the delivery chamber flows back into a cylinder is decreased, and decrease of volume efficiency can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for improving the efficiency of a hermetic electric compressor connected to a refrigeration cycle such as an electric refrigerator.

[0002]

2. Description of the Related Art A conventional hermetic electric compressor is disclosed in
One described in Japanese Patent Publication No. 19021 is known. In addition, the valve device of the conventional hermetic electric compressor is
The one described in JP-A-5-24444 is known. 4 and 5 (a) to 5 (d) show a conventional hermetic electric compressor. 4 and 5, reference numeral 2 denotes a closed container, and 4 denotes a cylinder block provided with a cylinder 3 elastically mounted in the closed container 2 and having an open end.
A motor 8 for reciprocating a piston 5 inside the cylinder 3 via a crankshaft 6 and a connecting rod 7, and a valve device 9 fixed to an open end of the cylinder 3 are provided.
10 is a discharge reed valve, 11 is a valve plate, 12
Is a cylinder head integrally formed with the stopper 13,
The discharge reed valve 10 is sandwiched between a valve plate 11 and a cylinder head 12, and the three members are integrally connected by bolts 14.

[0003] In the valve device of the hermetic electric compressor constructed as described above, when the refrigerant pressure in the cylinder increases, the refrigerant pushes up the discharge reed valve 10, and the discharge reed valve 10 contacts the stopper 13. When the pressure difference between the cylinder and the discharge chamber decreases, the discharge reed valve 1
0 peels off from the stopper 13 by the restoring force of the elastic deformation.

[0004]

However, the compressed refrigerant contains lubricating oil in the form of mist, and the lubricating oil adheres to the contact surfaces of the discharge reed valve 10 and the stopper 13 with the discharge reed valve 10. In state. for that reason,
In the above conventional configuration, when the discharge reed valve 10 is pressed by the stopper 13 during the compression stroke, the discharge reed valve 10 is discharged by viscous force of the lubricating oil interposed between the discharge reed valve 10 and the contact surface of the stopper 13 with the discharge reed valve 10. The reed valve 1 is in a state of sticking to the stopper 13. When the pressure difference between the discharge chamber and the cylinder becomes small when the compression stroke is shifted to the suction stroke, the discharge reed valve 1
Since the recovery due to the elastic deformation of 0 is delayed by the adhesive force of the lubricating oil, the closing delay of the discharge reed valve 10 occurs, and the high-pressure refrigerant gas in the discharge chamber during this period flows back into the cylinder 3 to lower the volume efficiency. I was

An object of the present invention is to reduce the delay in closing the discharge reed valve 10 by solving the above-mentioned conventional problems.

[0006]

According to the present invention, a groove is added to a contact surface of a stopper with a discharge reed valve so that the discharge reed valve can be easily separated from the contact surface of the stopper. As a result, the discharge hole can be quickly sealed.

[0007]

According to the first aspect of the present invention, a groove is provided in a contact surface of a stopper with a discharge reed valve, and lubrication of a contact surface of the discharge reed valve with a stopper is provided. The oil film of the oil is divided into small sections by the refrigerant gas entering the groove, so that the oil film on each section screen is easily cut, and the discharge reed valve is separated from the contact surface of the stopper with the discharge reed valve by restoring elastic deformation. It has the effect of being easy to do.

According to a second aspect of the present invention, a stopper provided with a groove in a contact surface with a discharge reed valve and a cylinder head are integrally formed by die casting or the like, and together with the above operation, the number of parts of the product is reduced. It can be manufactured inexpensively.

According to a third aspect of the present invention, there is provided an inverter-type hermetically sealed electric compressor which is operated at a high rotational speed exceeding the power supply frequency and which operates even when the discharge reed valve is required to follow up at a higher speed. Accordingly, the discharge hole can be sealed more quickly.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In recent years, from the viewpoint of environmental protection, CFC-based refrigerants used in hermetic electric compressors, for example, R12, contain chlorine in the molecule, so that even if a small amount is released into the atmosphere, even a small amount of stratosphere. It is being clarified that large amounts of ozone are destroyed by chlorine-free HC-based (R600a), HFC
The switching of the system (R134a, R410A, R407C) to the alternative refrigerant is rapidly progressing. In addition, it is necessary to reduce energy consumption to prevent global warming,
There is a strong demand for energy saving of hermetic electric compressors used in home refrigerators, which consume a large amount of electricity each year.

An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment) FIGS. 1, 2 and 3 show a hermetic electric compressor according to an embodiment of the present invention. 1, 2 and 3, in this embodiment, the stopper 15 and the cylinder head 18 are integrally formed by die casting or the like, and a plurality of grooves 16 that intersect with the contact surface of the stopper 15 with the discharge reed valve 10. Is formed by a die casting mold. As a result, the contact surface of the discharge reed valve is divided into a plurality of small sections.

With the above construction, the discharge reed valve 10 is pressed by the stopper 15 during the compression stroke, and the discharge reed valve 10 is pressed by the lubricating oil interposed between the discharge reed valve 10 and the contact surface of the stopper 15 with the discharge reed valve 10. Adhere to the stopper 15. Next, in the suction stroke, when the pressure difference between the pressure in the cylinder 3 and the pressure in the discharge chamber becomes small, the discharge reed valve 10 tends to separate from the stopper 15 by the restoring force of the elastic deformation. At this time, since the refrigerant gas in the discharge chamber enters the cross groove 16, the oil film of the lubricating oil interposed on the contact surface of the discharge reed valve 10 with the stopper 15 is separated, and the refrigerant gas enters from the surroundings. The oil film on the contact surface divided into small sections is easily cut, and the discharge reed valve 10 is easily separated from the stopper 15 due to restoration of elastic deformation. Is sealed. That is, the time during which the high-pressure refrigerant gas in the discharge chamber flows back into the cylinder 3 due to the delay in closing the discharge reed valve 10 is shortened. As a result, a decrease in the volumetric efficiency of the hermetic electric compressor can be suppressed.

In this embodiment, the shape of the groove is a cross, but it goes without saying that the same effect can be obtained even if the oil film of the lubricating oil on the contact surface is divided into single or plural grooves and straight or curved grooves. No. The stopper 15 is formed integrally with the cylinder head 18 by die casting.
Since the cross groove 16 can also be integrally molded with a die casting mold,
Processing is unnecessary, the number of parts can be reduced, and the assembly efficiency can be improved.

Further, when the motor of the hermetic electric compressor is operated at a high frequency exceeding the power supply frequency by the inverter system, the interval between the suction stroke and the compression stroke is shortened. The volume efficiency is significantly reduced due to the backflow of gas from the discharge chamber into the cylinder. However, by using the valve device of the present invention, when a transition is made from the suction stroke to the compression stroke, the discharge reed valve 10 is quickly separated from the stopper 15 and seals the discharge hole 17, so that even when the high pressure refrigerant gas is operated at a high frequency, The time during which the gas flows backward from the discharge chamber into the cylinder 3 is shortened, and a decrease in the volumetric efficiency of the hermetic electric compressor can be suppressed to a small level.

[0016]

As is apparent from the above embodiment, according to the first aspect of the present invention, the discharge reed valve quickly opens the discharge hole by providing the groove on the contact surface of the stopper with the discharge reed valve. Since sealing is performed, there is no delay in closing and an advantageous effect of improving volumetric efficiency can be obtained.

According to the second aspect of the present invention, in addition to the effects of the first aspect, by forming the stopper integrally with the cylinder head, the advantageous effects of reducing the number of parts and improving the assembly efficiency can be obtained. .

Further, according to the third aspect of the invention, even when the motor of the hermetic electric compressor is operated at a frequency exceeding the power supply frequency, the reduction in volume efficiency due to the delay in closing the discharge reed valve is small. Effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view of the valve device of the hermetic electric compressor according to the first and second embodiments of the present invention;

FIG. 3 is a perspective view of a cylinder head of the hermetic electric compressor according to the first and second embodiments of the present invention;

FIG. 4 is a longitudinal sectional view of a conventional hermetic electric compressor.

5A is a sectional view of a valve device of a conventional hermetic electric compressor, FIG. 5B is a bottom view of a cylinder head of the conventional hermetic electric compressor, and FIG. 5C is a discharge reed valve of a conventional hermetic electric compressor. (D) Plan view of valve plate of conventional hermetic electric compressor

[Explanation of symbols]

 2 Closed container 3 Cylinder 4 Cylinder block 5 Piston 6 Crankshaft 7 Connecting rod 8 Motor 10 Discharge reed valve 11 Valve plate 15 Stopper with groove 16 Groove 17 Discharge hole 18 Cylinder head

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuji Mori 4-2-5 Takaida Hondori, Higashi Osaka City, Osaka Inside Matsushita Refrigeration Co., Ltd.

Claims (3)

[Claims] 1. A closed vessel, a cylinder block having a cylinder elastically mounted in the closed vessel 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 valve plate fixed to the open end of the valve and having a suction hole and a discharge hole, a thin plate-shaped suction reed valve and a discharge reed valve sealing the suction hole and the discharge hole, respectively, and fixed to the cylinder via the valve plate A hermetic electric compressor, comprising: a cylinder head having a discharge chamber; and a stopper for regulating an opening amount of the discharge reed valve, wherein a groove is provided on a surface of the stopper that abuts the discharge lead. 2. The hermetic electric compressor according to claim 1, wherein a stopper is formed integrally with said cylinder head. 3. The hermetic electric compressor according to claim 1, wherein the motor is operated at a rotation speed exceeding a power supply frequency by an inverter system.