JPS59176478A - Closed compressor - Google Patents

Abstract

PURPOSE:To form a suction chamber in a large capacity by fixing a cover gasket with a dish-shaped cross section and having a discharge hole outside a cylinder head together with a discharge muffler. CONSTITUTION:A cover gaskst 21 covers the outside of a cylinder head 5a to form a suction chamber 16, and it is fixed with fitting bolts together with a discharge muffler 18. Therefore, the refrigerant flowing through a suction pipe provided on a case main body 1 flows into the suction chamber 16 through a suction passage 5c, and after flowing into a cylinder 12, it is fed by pressure to the discharge muffler 18 while being compressed. Accordingly, the suction chamber 16 is formed in a large shape and is fixed together with the discharge muffler 18, thereby the refrigerant flow is made silent and the suction efficiency of the refrigerant can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hermetic compressor that is incorporated into, for example, a refrigerator or a room cooler, and particularly relates to a cover gannuket attachment device for a cylinder head in this hermetic compressor.

[Technical background of the invention]

As shown in FIGS. 1 to 4, this type of hermetic compressor that has already been proposed has a closed cylindrical main body (casing) 1 with a plurality of platens 2 on the inner peripheral wall surface.
A, 2bi are attached, and a cover 8af is attached to each platen 2a, 2b: a cylinder of the compression device 4 which is integrated with the drive motor 3, a main body 5, and each coil spring 6a, 6bi is interposed in a floating state. A main bearing 7 is provided at the upper center of the cylinder main body 5, and an auxiliary bearing 8 is attached to the cylinder main body 5 located directly below the main bearing 7, and a drive motor is connected to the main bearing 7 and the auxiliary bearing 8. A rotating shaft (crank shaft) 9 integral with the rotor 3b of No. 3 is installed, a crank portion 9ai is formed on a part of this rotating shaft 9, and the base 10a of a Bignton rod 10 is fully installed on this crank portion 9a, This pinuton rod 1
0 is provided with a piston 11f, this Pierton 11'i5 is slidably fitted into the cylinder 12 formed in the cylinder body 5, and the cylinder head 51L located in this cylinder 12 has a suction valve guide valve 13 and a suction valve. 14, Valve device (valve unit) incorporating a discharge valve 15, Intake chamber 16
A cover gaff kerat 17 and a discharge muffler 18, which are formed in sections, are fixed to each other by a plurality of mounting holes 19. In particular, the cover gasket 17 interposed between the cylinder head 5a and the discharge muffler 18 has a flat ring plate having a refrigerant discharge hole 17a and a plurality of bolt insertion holes, as shown in the fourth ratio. 17 b <Drilled.

Therefore, in the hermetic compressor described above, when the drive motor 8 is energized, the rotating shaft 9 integrated with the rotor 3b of the drive motor 8 rotates. The piston 11 is connected to the piston 11 through the equipped pinuton rod IO.
By sliding the refrigerant back and forth within the cylinder 12, the refrigerant that has flowed in through the suction pipe (not shown) attached to the Cane main body 1, as shown in FIGS. 1 and 2,
From the suction passage 5C to the intake chamber 16 during the forward stroke of the piston 11
At the same time as the discharge valve of the valve device 15 is closed, the suction valve 14 is opened and the refrigerant flows into the cylinder 12. Thereafter, while compressing the refrigerant in the return stroke of the piston 11, At the same time as the suction valve 14 is closed, the discharge valve is fully opened to muffle the sound while pressure-feeding it to the discharge muffler 18 through the discharge hole 17a.Furthermore, the discharge pipe 20 attached to the discharge muffler 18 is connected to a condenser that constitutes a refrigeration cycle. (capacitor).

[Problems with background technology]

However, as shown in FIG. 8, the cover gasket mounting device for the hermetic compressor described above uses a flat cover gasket 7, so a ring ridge 5b for suction sealing is provided on the outer peripheral edge of the cylinder head 5a. Due to the need to form a seal, finishing the seal on the ring dam 5b of C is troublesome, and the weight of the cylinder body 50 held in a floating state is biased and becomes heavy, and furthermore, the suction Since it is necessary to form a thick ring embankment 5b having a sealing function, the capacity of the suction chamber 16 is limited and becomes small, and as a result, the dynamic phenomenon of the refrigerant on the suction side becomes severe. However, there are disadvantages such as a decrease in suction efficiency and an increase in noise due to the flow of refrigerant.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and it is possible to suppress the generation of noise due to the flow of refrigerant by increasing the capacity of the suction chamber, and also to improve the refrigerant suction efficiency. The present invention provides a hermetic compressor whose purpose is to reduce the weight of the cylinder body in a well-balanced manner.

[Summary of the invention]

The present invention provides a valve device having a suction valve and a discharge valve in the cylinder head of a cylinder main body forming a cylinder, and a cover gasket having a dish-shaped cross section and having a discharge hole on the outside of the cylinder head is attached to the cylinder head. It is constructed by being fixed together with a discharge muffler so as to form an intake chamber on the outside of the device.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

Note that the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example.

5 to 7, reference numeral 5 denotes a cylinder main body of a compression device in a hermetic compressor, and a cylinder 12 is formed in this cylinder main body 5. A piston 11 connected to a binuton shuttle + OK is slidably fitted. The cylinder head 5a where the cylinder 12 is located has a valve device 1 that includes a suction valve guide plate 13, a suction valve 14, and a discharge valve.
A cover gasket 2 with a Jm-shaped cross section forms an intake chamber 16 on the outer peripheral surface 5d of the cylinder head 5a and on the outer end surface of the valve device 15. In this way, it is fixed together with the discharge muffler 18 by a plurality of mounting bolts 19. moreover,
In the middle of the above cover gasket 2], there is a discharge hole 21a.
A plurality of bolt insertion holes 2] are provided in the cover gasket 2] located on the outside of the discharge hole 21.
B is pierced. Further, a curved sealing surface 2]C formed at the outer peripheral end of the cover gasket 2] is in contact with the outer peripheral surface 5d of the cylinder head 5a, and the cover gasket 2] is in contact with the suction passage 5C. The refrigerant flowing into the intake chamber 16 can be sealed off.

That is, the cover gasket 21 is secured together with the discharge muffler 18 by each mounting bolt 19 so as to cover the outside of the cylinder head 5a to form an intake chamber 16.

Therefore, in the hermetic compressor according to the present invention, when the drive motor 8 is driven, the piston 11 reciprocates within the cylinder 12, so that the suction pipe i=
During the working stroke of the piston 11, the refrigerant flows into the intake chamber 16 from the suction passage 5C, closes the discharge valve of the valve device 15, and at the same time opens the suction valve 14 and flows into the cylinder 12. and then the piston 1
While compressing the refrigerant in the first return stroke, the suction valve 14 is closed, and at the same time, the discharge valve is fully opened to muffle the refrigerant while forcefully feeding it through the discharge holes 17 a f to the discharge muffler 18, and further,
A discharge pipe 2o attached to the discharge muffler 18 is configured to supply a condenser constituting a refrigeration cycle (see FIG. 1).

As described above, the present invention provides a cover gasket having a dish-shaped cross section and having a discharge hole 21a on the outside of the cylinder head 5a in place of forming the ring embankment 5b having the function of suction sealing. Since the intake chamber 16 is formed large and fixed together with the discharge muffler 18, the refrigerant flow is made quiet and the refrigerant suction efficiency is improved.

Next, the embodiment of the rib of the present invention shown in FIG. 8(A) is as follows:
The sealing surface 2]C' of the cover gasket 2] is in contact with the outer circumferential surface 5d of the cylinder head 5a to maintain airtightness.

Further, in the embodiment of the pond of the present invention shown in FIG. 8(B), the tip of the linear sealing surface 21c'' of the cover gasket 21 is brought into contact with the outer circumferential surface 5d of the cylinder head 5a to achieve a seal. It is structured so that it can be done.

Further, in the embodiment of the present invention shown in FIG. 8(0), the linear sealing surface 2c'' of the cover gasket 21 is in full contact with the outer circumferential surface 5d of the cylinder head 5a. It has the same structure as the Noh embodiment described above.

〔Effect of the invention〕

As described above, according to the present invention, the valve device 15 having the suction valve 14 and the discharge valve is provided in the cylinder head 5a of the cylinder main body 5 formed with the cylinder 12, and the discharge hole is provided on the outside of the cylinder head 5a. 2] A cover gasket 21 having a dish-shaped cross section and ai is attached to the outside of the valve device.
Since the suction chamber 16 is formed in the 8111 and fixed together with the discharge muffler 18, the capacity of the suction chamber 16 can be formed larger than those already proposed, which not only reduces noise generation. In addition to improving the refrigerant suction movement, the weight of the cylinder body 5 can also be reduced.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a hermetic compressor that has already been proposed.
FIG. 2 is an enlarged cross-sectional view showing the structure of the cylinder head of the hermetic compressor; FIG. 8 is an exploded cross-sectional view of the same;
FIG. 4 is a plan view of the cover gasket incorporated into the hermetic compressor, FIG. 5 is an enlarged sectional view showing the structure of the cylinder head of the hermetic compressor according to the present invention, and FIG.
The figure is an exploded sectional view of the same as above, FIG. 7 is a plan view of a cover gasket incorporated in the hermetic compressor, and FIG. 8 (A). (B) and (0) are diagrams showing functional embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Case body, 8... Drive motor, 5... Cylinder body, 5a... Cylinder head, 5c...
・Suction passage, 11... Piston, 12... Cylinder, 13... Suction valve guide plate, 14... Suction valve, 1
5...Valve device, 16...Intake chamber, 18...Discharge muffler, 21...Gover gasket. Applicant's agent Kiyoshi Inomata

Claims (1)

[Scope of Claims] 1. A cylinder head of a cylinder body forming a cylinder is provided with a valve device having a suction valve and a discharge valve, and the cylinder has a dish-shaped cross section with a discharge hole on the outside of the head. 1. A hermetic compressor, characterized in that a cover gasket l-' is fixed together with a discharge muffler so as to form an intake chamber on the outside of the valve device. A hermetic compressor according to claim 1, characterized in that a sealing surface is formed at the outer peripheral end of the cover gasket that contacts the outer peripheral surface of the cylinder head.