JPS5954785A - Oil supply device for compressor - Google Patents

Abstract

PURPOSE:To allow lubrication oil to be supplied stably and adjustably according to operational condition, by providing a valve body in an oil suction pipe immersed in an oil reservoir at its lower end, and providing a spring device having characteristics such that coefficient of linear expansion is changed at temperatures higher than a specific temperature, at one side of the valve body. CONSTITUTION:In an oil supply control device immersed in an oil reservoir 1 of a refrigerant compressor disposed on the most upstream side of an oil supply passage, a valve body 5 having an oil passage 4 is accommodated in a cylinder 3 of an oil suction pipe 2. There is provided on a lower side of the valve body 5 a coil spring of shape memory alloy having characteristics such that coefficient of linear expansion is rapidly increased at temperature higher than a specific temperature, while there is provided in an oil passage 7 on an upper side of the valve body 5 a coil spring 8 having characteristics of normal coefficient of linear expansion. With this arrangement, lubrication oil in the oil reservoir 1 is sequentially fed through an oil passage 9, the cylinder 3, and the oil passages 4, 7 and 11. When temperature of the lubrication oil becomes higher than a specific temperature, spring constant of the coil spring 6 is increased to upwardly push the valve body 5, thereby suitably adjusting an opening degree of the oil passage between the valve body 5 and the oil passage 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control mechanism for a refrigerant compressor oil supply system.

Conventional configuration and its problems Conventional refrigerant compressor lubrication system uses pump forced lubrication system,
In both differential pressure oil supply systems, the amount of oil supplied is controlled by detecting the rotational speed of a refrigerant compressor or the like or by detecting a differential pressure of lubricating oil or the like. The structure of these refrigerant compressor oil supply devices is complicated and high in cost because the detection body and the control body are often separate bodies. In addition, since the oil supply amount control method is unrelated to the viscosity of the lubricating oil, excessive or insufficient lubricating is performed, and the excess lubricating oil is compressed together with the refrigerant gas, reducing the compression efficiency of the refrigerant compressor and causing sintering of the sliding parts. 3. Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention applies a shape memory material having a property of rapidly changing coefficient of linear expansion to a spring device. The purpose is to improve the writing defects.

Structure of the Invention As a further structure, the present invention provides a valve body for controlling the opening degree of the oil passage in an oil suction pipe whose lower end is immersed in an oil sump, and one of the valve bodies has a normal spring characteristic. A spring device having a coefficient of linear expansion is disposed on one side, and a spring device having a characteristic that when the temperature exceeds a certain temperature, the coefficient of linear expansion increases rapidly, gradually increases by 1/2, suddenly decreases, and gradually decreases is provided on the other side.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 4 of the drawings showing embodiments thereof.
This will be explained with reference to the diagram. , Figure 1 is a cross section of the oil supply amount control device immersed in the oil sump 1 of the refrigerant compressor, which is the most upstream side of the oil supply passage, and there is an oil passage 4 inside the cylinder 3 of the oil suction pipe 2. The valve body 5 is housed under the valve body 5, and the linear expansion coefficient is at a certain temperature (for example, about 60°C).
) A coil spring 6 made of a shape-memory alloy with a characteristic that increases rapidly is arranged, and the oil passage 7 on the - side of the valve body 5 is arranged.
A coil spring 8 having a characteristic of a normal coefficient of linear expansion (the coefficient of linear expansion does not change much due to temperature changes) is arranged. Furthermore, an oil passage 9 is provided at the open end of the oil suction pipe 2.
A cap 10 provided with a cap 10 is press-fitted into the cylinder 3 and supports the coil spring 6. The hole diameter of the oil passage 7 is smaller than the hole diameter of the cylinder 3 and larger than the oil passage 11, and has a step 12 and a step 13 at each connection portion. The coil spring 8 is supported by a step 13, and an elastic ring 14 is attached to the outer circumferential groove of the valve body 5.

In the following configuration, the lubricating oil in the oil reservoir 1 is supplied to the oil passage 9, the cylinder 3, the oil passage 4, and the oil passage 7 by a pump device or differential pressure.
It flows into the oil passage 11 through the oil passage. Lubricating oil temperature or specific temperature (
When the temperature becomes J or higher (approx. 50℃), the linear expansion coefficient of the coil spring 6 increases rapidly, the spring constant increases, the valve body 5 is pushed up, and the gap between the upper end surface of the valve body 5 and the lower end surface of the oil passage becomes smaller. Adjust the oil passage opening. When the lubricating oil temperature reaches a certain temperature (
When the temperature drops below approximately 50° C., the coefficient of linear expansion of the coil spring 6 returns to its original value, the spring constant decreases, and the valve body 5 returns to its original position due to the reaction force of the coil spring 8. In addition, elasticity 1. ) Puffer 14 illusion: Always pressing against the inner wall of cylinder 3.

Further, FIG. 2 shows the coil springs and the mounting positions of the coil springs in FIG. 1 reversed. In this case, the gap between the upper end surface of the camp 10a and the lower end surface of the valve body 5a is used to adjust the oil passage opening, and the operation of the valve body 5a is the same as described above.

In FIG. 3, a coil spring 6b, which has the characteristic that the coefficient of linear expansion rapidly decreases and the spring constant decreases when the temperature reaches a certain temperature or becomes soil, is arranged above the valve body 5b (downstream side of the oil supply path).
A coil splinter 8b with normal spring characteristics is used as a valve body 5b.
This is an example in which the opening degree of the oil passage is adjusted by changing the gap between the lower end of the oil passage 7b and the upper end of the valve body 6b.

In fact, Figure 4 shows the coil springs and the mounting positions of the coil springs in Figure 3 reversed. In this case, the gap between the upper end surface of the cap 10C and the lower end surface of the valve body 5C is used to adjust the oil passage opening degree, and the operation of the valve body 5C is the same as described above.

In addition, by attaching the elastic ring 14 to the sliding outer diameter portion of the valve body 5, the elastic ring 14 is attached between the valve body 5 and the cylinder 3.
Since the valve body 5 is mounted in a rigid state, the vibration of the compressor itself can prevent the valve body 5 supported by the two spring devices from vibrating within the cylinder 3 and causing the oil passage opening to fluctuate. This has the effect of providing a stable supply of lubricating oil.

Effects of the Invention According to the present invention, until the refrigerant compressor starts when cold and the temperature of the lubricating oil in the oil sump reaches the set temperature, the oil passage opening degree is such that it is easy for the lubricating oil, which has high roughness and is difficult to flow, to pass through. When the refrigerant compressor is in steady operation, the lubricating oil temperature in the oil sump is higher than the set value, such as after startup when the refrigerant compressor is in steady operation or hot, and the spring device expands and contracts to prevent the lubricating oil, which has low viscosity and easy flow, from passing through. Since the opening degree of the oil passage is adjusted by the refrigerant compressor, a stable supply of lubricating oil with no excess or deficiency depending on the operating condition of the refrigerant compressor can be obtained at a relatively low cost.

Furthermore, excessive mixing with suction gas is eliminated, and the amount of lubricating oil flowing into the compressor cylinder is reduced, resulting in improved compression efficiency. Furthermore, the sliding parts can be properly lubricated, improving the durability of the sliding parts.

[Brief explanation of drawings]

FIG. 1 is a longitudinal section of a compressor oil supply system in an example of a compressor oil supply system according to an embodiment of the present invention. 1...Oil sump, 2...Oil suction pipe, 5...
... Valve body, 6... Coil spring (spring device), 8. Old... Coil spring (spring device), 10.
·····cap. Name of agent: Patent attorney Toshio Nakao Haga 1st person
Figure 1, // Figure 2 8α lDθ Figure 3 Figure 4 bc/θC = 497

Claims (1)

[Claims] A valve body for controlling the opening degree of the oil passage is provided in an oil suction pipe whose lower end is immersed in an oil sump, and a spring device having normal spring characteristics is arranged on one side of the valve body, and a spring device on the other side is arranged. is a compressor oil supply device equipped with a spring device that has the characteristic that the coefficient of linear expansion suddenly increases, gradually increases, suddenly decreases, and then gradually decreases when the temperature exceeds a certain temperature.