JPH02277986A - Horizontal scroll compressor - Google Patents

Abstract

PURPOSE:To reduce the oil discharge quantity by forming an Oldham's coupling key groove formed on a main frame in a rectangle, covering the key groove with an iron plate or the like arranged at the lower end section of a scroll into a dead-end road, and vertically providing an oil groove between a key section and the main frame. CONSTITUTION:A ring-shaped Oldham's coupling 17 is provided between a main frame 6 and a revolving scroll 11, and the key section 18 of the coupling 17 is coupled with the key groove section 19 of the main frame 6. An oil groove 20 is arranged in the radial direction on the main frame 6 side of the key section 18. The key groove section 19 is made rectangular, and it is not penetrated in the radial direction. The key groove section 19 is covered by a groove cover plate 21 such as an iron plate against the revolving scroll 11 side into a dead- end road 22, and a thrust plate 23 is included. Oil C does not flow out to the suction side from the lower key groove section 19, the oil compression at the dead-end road 22 is avoided by the oil groove 20, and the discharge quantity can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a horizontal scroll compressor which is used for refrigeration and air conditioning and is equipped with oil discharge measures.

<Prior art> Generally, a scroll compressor has two suction ports, so if it is made into a ti'7f (tM type), the oil inside the case must be properly isolated from the suction port. is steadily sucked in from the suction port, causing oil to be discharged.

In the past, as shown in Fig. 5A, instead of paying attention to the suction of oil from the suction port, the scroll compressor section a
The ura C accumulated on the end cap side of the high pressure side can be discharged as it is from the discharge pipe d, or it can be discharged from the capillary tube e provided at the end cap of the high pressure side as shown in Figure 5B. A method has been adopted in which the pressure is returned to the low pressure side g via f.

<Problem to be solved by the invention> However, with this method of sucking oil steadily from the suction port, the oil hunting phenomenon cannot be reliably eliminated, and when using a refrigerator, there is no disconnection between the scroll compressor and the refrigerant cycle. There was a risk that this would occur.

In view of the above circumstances, the present invention aims to close the gap caused by the reciprocating movement of the Oldham joint in the keyway portion of the main frame, which is the cause of oil suction from the suction port, and to The object of the present invention is to provide a horizontal scroll compressor which solves the above problems by disposing an oil return passage in the suction port and blocking the oil flow to the suction port.

Means for Solving the Problems> The present invention provides a horizontal type system in which a keyway is provided in the orbiting scroll of a scroll compressor section and a main frame, respectively, and the two are connected to each other by a key part of an Oldham joint fitted in the keyway. In a scroll compressor, the keyway for the Oldham joint formed in the vertical direction in the main frame is formed in a U-shape or rectangle, and this keyway is closed with an iron plate, etc. arranged at the lower end of the orbiting scroll side. In the key part of the Oldham joint, an oil groove is provided in the vertical direction between the key part fitted in the key groove of the main frame and the main frame.

Due to the above structure, the oil flowing inside the shaft lubricates the main frame bearing, the boss portion of the orbiting scroll, and the bearing portion, and then falls between the main frame and the orbiting scroll. This accumulated oil can be easily returned to the oil suction port, but due to the suction force of the suction and the movement of the Oldham joint, oil flows toward the suction side. Therefore, by closing and sealing the orbiting scroll side of the main frame key groove, oil will no longer flow from the lower key groove to the suction side. In this case, since the key groove is a dead end, an oil groove is provided between the key of the Oldham joint and the main frame to prevent oil compression.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

In Figs. 1 to 4, reference numeral 1 indicates a low pressure chamber 4 having a suction pipe 3 on one side of a closed container 2 serving as a horizontally placed tank, in which a motor section 5 and a main frame 6 are arranged, and a discharge pipe 7 on the other side. This scroll compressor is constructed by disposing a scroll compressor section 9 in a high pressure chamber 8.
Orbiting scroll 1 having a spiral body 11a that fits into 0a
1, and a connecting boss portion 12 protruding from the base end of the orbiting scroll 11 is connected to a bearing 15 of a balance weight type intermediate bearing member 14 disposed at the tip of a shaft 13 penetrating through the center of the electric motor portion 5. The shaft 13 is supported by a bearing part 16 provided on the main frame 6. Furthermore, a ring-shaped Oldham joint 17 is interposed between the main frame 6 and the orbiting scroll 11. In this case, the Oldham joint 17 has a key part 18
fits into one key groove carved in the main frame 6,
Further, the key portion 18 itself is provided with an oil groove 20 disposed in the radial direction on the main frame side. Instead of this oil groove 20, a chamfer 20' may be provided in the same radial direction. Further, the key groove portion 19 has a U-shaped or rectangular groove 19a, and has a structure that does not penetrate in the radial direction.Moreover, one key groove portion has a groove cover plate 21 such as an iron plate on the orbiting scroll side. It constitutes a dead-end alley 22. This groove cover plate 21 also includes a thrust plate 23.

Next, to explain this effect, first, during normal compression operation of the scroll compressor 1, the gaseous refrigerant flowing into the low pressure chamber 4 from the suction pipe 3 passes through the surrounding space 25 of the scroll compressor section 9 from the suction passage 24. The spiral body 11 of the orbiting scroll 11 and the fixed scroll 10. The gas is taken in between a and 10a, is gradually compressed, and is discharged from a central discharge hole 26 through a high pressure chamber 8 to the outside.

Here, the oil L flowing inside the shaft 13 is transferred to the bearing portion 16 of the main frame 6 and the orbiting scroll 1.
1 boss portion 12. After lubricating the bearing 15, it falls between the main frame 6 and the orbiting scroll 11 and accumulates below. This accumulated oil L can be easily returned to the oil suction port, but due to the suction force of the suction and the movement of the Oldham joint 17, some oil L flows toward the suction side (However, most of the oil L flows through the orbiting scroll. (sealed with the tooth back mirror plate 27 and the thrust plate 23; the thrust plate of the main frame 6; and the plate groove 28).

Therefore, by closing and sealing the orbiting scroll 11 side of one key groove portion of the main frame 6, the oil L will not flow from the lower key groove portion 19 to the suction side. The key groove 18 of the Oldham joint 17 is designed to prevent oil from being compressed even if the key groove 22 becomes a dead end.
An oil groove 20 or groove 20' is provided on the back side.

The same effect can be obtained even if an oil groove (not shown) is provided in the key groove portion 19 of the main frame 6. Furthermore, if this is applied and the oil discharged from the oil groove is guided to the shaft, it can also be used as an oil pump.

<Effects of the Invention> As described above, in the horizontal scroll compressor of the present invention, the shape of the key groove part of the Oldham joint of the main frame, the shape of a part of the key of the Oldham joint, and the key groove part of the main frame are fixed with iron plates or the like. By creating an oil groove between the key part and the main frame, and by oriented the key groove part of the main frame up and down, it is possible to cut off the flow of oil from the main frame and reduce the amount of oil discharged. Moreover, there is no oil hunting phenomenon in the refrigerant cycle without IC.

[Brief explanation of drawings]

Fig. 1 is an enlarged cross-sectional view of the assembled main frame and orbiting scroll showing an embodiment of the present invention, Fig. 2 is a front view of the same, Fig. 3 is a side view of the Oldham joint, and Fig. 4 is a cross-sectional view of the main frame and orbiting scroll in an assembled state. Cross-sectional view of scroll compressor, Figure 5A,
B is an explanatory diagram of oil derivation from a conventional scroll compressor. 6... Main frame, 10... Fixed scroll,
11... Orbiting scroll, ] 7... Oldham joint, ]
8... Key part, 19... Key groove part, 20... Oil groove, 21... Groove cover plate, 22... Dead end. 41 Figure

Claims (1)

[Claims] 1. In a horizontal scroll compressor, the orbiting scroll of the scroll compressor section and the main frame are each provided with a keyway, and are connected to each other by the key part of the Oldham joint fitted in the keyway. The keyway for the Oldham joint is formed into a U-shape or a rectangular shape, and this keyway is closed with an iron plate or the like provided at the lower end of the orbiting scroll side to form a dead end. , a horizontal scroll compressor characterized in that a vertical oil groove is provided between the main frame and a key part fitted in a key groove of the main frame.