JPS6129992Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on one cylinder at the open end of two cylinders arranged side by side.
This invention relates to an improvement of a hermetic compressor equipped with valve seat plates.

In a conventional hermetic compressor, two cylinders are arranged side by side in the crankshaft direction, and the open ends of the cylinders are closed by a single valve seat plate. That is, two suction valves each having a protrusion that engages with an engaging portion and a valve receiving portion provided on the periphery of the cylinder opening are attached to the valve seat plate. The engaging portion and the valve receiving portion are provided in a cross shape around the cylinder opening so as to form an angle of 45° with respect to the crankshaft direction. The communication hole of the valve seat plate communicates with an intake gas passage provided in the cylinder via a suction chamber provided in the cylinder cover. A gasket is interposed between the cylinder and the cylinder cover.

In a hermetic compressor with this structure, the engaging part and valve receiving part provided on the periphery of the cylinder opening are tilted at 45 degrees with respect to the crankshaft direction, so that the cylinder pitch can be reduced while maintaining airtightness between the cylinders. (See, for example, Japanese Utility Model Application Publication No. 112085/1985).

However, the suction gas passage that supplies refrigerant into the cylinder is only provided on one side of the cylinder, and if the gasket is installed in the opposite direction, it will no longer communicate with the suction chamber of the cylinder cover, and refrigerant will be supplied into the cylinder. I had a problem where it no longer works.

In order to solve the above problem, this proposal is designed so that even if the valve seat plates installed in the openings of two cylinders arranged side by side are installed upside down, the refrigerant can be supplied into the cylinders without being affected by the installation. It is intended for the purpose of

In this case, the suction passage formed in the valve seat plate is formed asymmetrically with respect to a plane passing through the center of the cylinder, and is also formed point symmetrically with respect to the midpoint of a line connecting the centers of the two cylinders. .

By configuring the above-mentioned structure, the present invention makes the left and right suction passages asymmetrical to compensate for the difference in the suction state between the left and right sides of the suction valve installed at an angle, thereby reducing the amount of refrigerant flowing into the cylinder from the left and right suction passages. In addition, the suction passages are formed point-symmetrically with respect to the two cylinders, and the valve seat plate is installed upside down with respect to the cylinders, so that there is no shortage of refrigerant supply. This eliminates the possibility of improper board installation.

The present invention will be explained below based on the embodiment shown in the drawings.

1 is a cylinder block having two upper and lower cylinders 2 and 3 arranged on the same side, and communication holes 6 and 7 are bored on both outsides of the cylinders 2 and 3 to communicate with a suction muffler 45. ing. A valve seat plate 8 closes the opening of the cylinder block 1, and two suction valves 9, 9 and two discharge valves 10, 10 are mounted on this valve seat plate, respectively. The suction valves 9, 9 are formed into a ring shape with locking claws 11, 11 at both ends, and the claws are arranged vertically to form the claws of the two suction valves 9, 9. 11 and 11 are tilted in the same direction so that they do not overlap. The discharge valves 10, 10 have three bolts 12,
The discharge valve guides 13, 13 are fixed to the valve seat plate 8 at 12, 12, and the discharge valve guides are fixed symmetrically at 180 degrees.

The valve seat plate 8 opens into the communication holes 6 and 7 formed in the cylinder block 1 and connects the cylinders 2 and 3.
Suction passages 14 and 15, which communicate with the inner cylinder via suction valves 9 and 9 as appropriate, are simultaneously formed using a core (not shown) during casting so as to open on the side surface of the cylinder block 1. The suction passages 14 and 15 are formed asymmetrically with respect to a plane passing through the centers of the cylinders 2 and 3, and are formed symmetrically with respect to the midpoint of a line connecting the centers of the two cylinders 2 and 3. .

In the hermetic compressor configured in this way,
Since the suction valves 9, 9 attached to the valve seat plate 8 are tilted in the same direction, the two cylinders 2, 3 can be placed close to each other, and the height of the cylinder block 1 can be lowered, resulting in closed-type compression. This allows the machine to be made smaller. In addition, since the valve seat plate 8 is formed point-symmetrically, only one type of core can be used to form the suction passages 14 and 15 at the same time during casting, and the machining equipment can be used as a machining jig for one cylinder. When assembling into 1, it can be installed upside down to prevent mistakes in assembling. Furthermore, even if the middle portions of the suction valves 9, 9 that open to the maximum are deviated from the suction passages 14, 15 by the amount of inclination, the suction passages are formed asymmetrically from left to right with respect to one cylinder 2, 3. Therefore, substantially the same amount of refrigerant gas flows into the cylinders 2 and 3 from the left and right suction passages 14 and 15, and there is no reduction in refrigerant capacity due to a shortage of refrigerant gas.

In the proposed hermetic compressor, the suction passage formed in the valve seat plate is formed asymmetrically with respect to a plane passing through the center of the cylinder, and is point symmetrical with respect to the midpoint of a line connecting the centers of the two cylinders. Because of this, even if the suction valves are not installed symmetrically, approximately equal amounts of refrigerant can be supplied into the cylinder from the left and right suction passages, and the valve seat plate can be installed upside down on the cylinder block, allowing the valve seat plate to Post-processing due to incorrect board installation can be omitted.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a front view of the cylinder block, and FIG. 3 is a front view of the valve seat plate. 2, 3... Cylinder, 4, 5... Suction muffler,
6, 7... Communication hole, 8... Valve seat plate, 9, 9... Suction valve, 11, 11... Claw portion, 14, 15... Suction passage.

Claims (1)

[Scope of utility model registration request] A cylinder block having two cylinders arranged side by side and communication holes provided on both sides of the cylinders, a valve seat plate attached to the cylinder block to close the opening of the cylinder, and a valve seat plate attached to the valve seat plate. a ring-shaped suction valve, a suction passage communicating between the opening of the communication hole and the opening of the cylinder is formed in the valve seat plate, and the suction valve has two locking holes protruding outward. In a rotary compressor in which claw portions are provided facing each other and are installed with the claw portions tilted in the same direction, the suction passage is formed asymmetrically with respect to a plane passing through the center of the cylinder, and there are two suction passages. A hermetic compressor characterized by being formed point-symmetrically with respect to the midpoint of a line connecting the centers of the cylinders.