JPS6081484A - Swash plate compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to compression warfare, for example, for automobile air conditioning, and in particular to smoothing sliding parts inside a compressor with lubricating oil contained in suction refrigerant. This invention relates to a swash plate compressor equipped with a sliding mechanism.

[Background of the invention]

The schematic structure of a conventional swash plate compressor disclosed in US Pat. No. 3,904,320 is shown in FIG. In the figure, a shaft 2 rotatably driven by a vehicle engine or the like is supported within a cylinder block l. Inside the cylinder block 1, there are provided three cylinder bores 3 formed at three equal positions in the circumferential direction and a refrigerant passage 4 formed between each cylinder bore 3. The refrigerant containing lubricating oil is introduced from the suction port 5 provided in the side wall of the cylinder flock 1. A double-acting piston (indicated by reference numeral 6 in FIG. 2) is fitted into each of the seven cylinder pores 3.

On the other hand, a swash plate 7 is fixed to the shaft 2, and when the swash plate 7 rotates, the piston 6 is moved through the slippers 8L and holes 9 provided on both sides of the swash plate 7, as shown in FIG. It is designed to be able to move back and forth. Pulp plates (10, 10) are fastened to both end faces of the cylinder block 1, and control the discharge of high-pressure refrigerant from the refrigerant passage 4 into the cylinder bore 3 to the suction port of the low-pressure refrigerant in accordance with the stroke of each piston 6. It looks like this. There are 11 side covers on the outside of the valley pulp plate 10.10.

11B is fastened, and in the valley side covers 11A and IIB, a low pressure plate 12 through which a low pressure refrigerant passes and a high pressure plate 13 through which a high pressure refrigerant passes are formed between the valve plate 10.10.

Since the swash plate compressor has the structure described above, when the shaft 2 is driven to rotate the swash plate 7, a refrigerant such as Freon gas is introduced from the suction port 5 and flows in the direction of the arrow in FIG. housing 12, 12, cylinder bore 3, high pressure chamber 13
．． 13 are communicated with each other through a communication passage 14 so that the pressure is the same.

However, such a conventional swash plate compressor has caused a problem in that the sliding portion of the swash plate 7 and slipper 8 is not sufficiently dampened as the amount of lubricating oil decreases due to a decrease in suction gas efficiency. Ta. Furthermore, a thrust bearing 15 consisting of rollers 15A and races 15B is provided between the cylinder block 1 and the flesh surface of the swash plate 7 on the shaft 2, but the lubrication in this thrust bearing 15 is also insufficient. It had a disadvantage of 9.

In particular, the above-mentioned drawbacks tend to occur when the compressor rotates at high speed. The cause of this is that the amount of heat generated from the oil film on the sliding part increases in proportion to approximately the square of the relative speed of the sliding member, and as a result, the oil film temperature increases, the oil viscosity decreases, and the oil film thickness decreases. Because it brings.

[Purpose of the invention]

An object of the present invention is to provide a swash plate compressor that has improved durability against poor lubrication of the thrust bearing, the swash plate, and the sliding surfaces of the slipper.

[Summary of the invention]

In order to achieve such an object, the present invention provides a shaft, a swash plate fixed to the shaft, a thrust bearing disposed on the shaft on both sides of the swash plate,
A swash plate compressor comprising a piston that reciprocates when the swash plate rotates with a shaft, and a cylinder bore in which the piston is fitted, wherein a refrigerant suction port is provided in the shaft, and the swash plate and a thrust bearing are provided. The refrigerant is supplied into the cylinder bore through the cylinder bore.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail using Examples.

FIG. 3 is a configuration diagram showing an embodiment of the swash plate type compression V& according to the present invention. In this figure, the same reference numerals as in FIG. 1 indicate the same materials. The main difference in the configuration from Fig. 1 is the shaft 2.
It is in. That is, in FIG. 3, the refrigerant suction port is formed by a through hole 22 extending along the central axis of the shaft 2 that protrudes outward from the side cover 11B. The through hole 22 is formed by a union 23 provided in the side cover 11B and a communication pipe 24 that communicates the union 23 with the shaft 2. The communication hole 22 is formed so as to extend to a portion where the swash plate 7 and the thrust bearing 15 are provided inside the shaft 2. This through hole 22 further extends in a direction perpendicular to the axial direction so that its opening is positioned below the thrust bearing 15. Thrust bearing 1
For example, three small holes 25 located below the swash plate 7 are provided at the front and rear of the swash plate 7, corresponding to the number of cylinder bores 3. Further, the through hole 22 is further extended in the axial direction to a corner layer that is approximately the same as the tilt angle of the swash plate 7, and is positioned such that its opening is close to the front and back surfaces of the &if plate 7, respectively. It looks like this. Three small holes 26 are provided on each of the front and back surfaces of the swash plate 7, corresponding to the number of cylinder bores 3, for example.

With this configuration, as shown in FIG. 4(a), the small hole 25 to the thrust bearing 15 for the explosive gas introduced into the union 23, which serves as the refrigerant suction port, Passed all the way through the thrust bearing 25, and
It passes through the front and back surfaces of the swash plate 7 through the small hole 26 in the swash plate 7,
It will be supplied into the Dere Dere 7 Ring Hoa 3.

Therefore, since the lubricating oil containing the refrigerant gas is always supplied to the thrust bearing 15 and the swash plate 7 and sucked into the cylinder bore 3, the thrust bearing Also, it is possible to improve the durability against slippage of the sliding surface of the swash plate and the slipper.

Furthermore, when the rotational speed of the compressor increases, the speed of the suction gas passing through the shaft 2 becomes faster than the speed 1, and therefore the resistance there increases.

As a result, the pressure drop increases, the pressure difference becomes smaller, and the suction plate for the suction gas becomes smaller, which also has the effect of increasing the capacity control force fEjl.

In this swash plate compressor, the suction port of the conventional compressor is
What is the left side of the discharge gas temperature of this example and the discharge gas temperature measured by providing a restriction υ for the pressure loss generated in this example? A5
As shown in the figure. In this case, the temperature of the discharged gas in the product of the present invention is high, and the suction gas collides with or passes through the sliding parts, and the suction scum contributes to the cooling of each sliding part, and at the same time, the oil in the suction gas It was confirmed that water was being supplied to the sliding parts.

It was confirmed that there was almost no wear on each sliding surface in this example, even after an exercise time of up to 10 hours (ρ).

〔Effect of the invention〕

As is clear from the above description, according to the swash plate compressor according to the present invention, the thrust bearing, the swash plate, and the sliding portion of the slipper are different from each other. 'Durability against defects can be improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of a conventional swash plate compressor, with the piston excluded; Fig. 2 is a sectional view showing an example of a conventional swash plate compressor, with histones determined; The figure is a block diagram showing an embodiment of the swash plate compressor according to the present invention, FIGS. 4(a) and 4(b) are block diagrams showing an embodiment of the bottom part of the swash plate compressor according to the present invention, and FIG. is an experimental graph showing the effect of the present invention. 1...Cylinder block, 2...7-foot, 3
・7 Lindahore, 6... Histone, 7... Oblique & 1.
8...Slipper, 9...Hole, 22...iA hole, 23...Union, 25.26...Small hole. 4th day (α) Waku (bQ 1 5th compression ridge color number

Claims (1)

[Claims] ■A shaft, a swash plate fixed to this shaft,
In the swash plate type pressure #@, the swash plate type pressure #@ consists of a thrust bearing arranged on the shaft on both sides of the swash plate, a piston that reciprocates as the swash plate rotates with the shaft, and a cylinder bore in which the piston is fitted,
A swash plate compressor, characterized in that a refrigerant suction port is provided in the shaft, and refrigerant is supplied into the cylinder bore through the swash plate and the thrust bearing.