JPS59224491A - Lubricating device for compressor - Google Patents

Abstract

PURPOSE:To adjust the opening of a differential pressure lubricating oil passage as well as to secure an optimum lubrication quantity of oil to each sliding part, by installing an opening adjusting passage adapting a form memory alloy material in the point midway in the differential pressure lubricating passage, and also installing an electric heater in and around this passage. CONSTITUTION:At the upstream side of an oil suction passage 6, an adjusting passage 9 provided with a throttle mechanism using a form memory alloy material is installed in a state of being dipped in an oil sump 8, while an electric heater 25 attached to the outer circumference of an oil case 7 so as to surround the adjusting passage 9 is energized with current and controlled by a control device 27 receiving a signal out of a temperature sensor 26 attached to an outer underside of the oil sump 8. The adjusting passage 9 opens its opening when oil temperature in the oil sump 8 is not yet reached to the setting temperature but when reaching the setting one, it is controlled by the continuous rating current of the heater 25 so as to throttle the opening. With this constitution, the lubrication quantity of oil to each sliding part of a compressor can be kept up at optimum condition all the time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compressor, and more particularly to a throttle mechanism for an oil supply device in a refrigerant compressor.

Conventional configuration and its problems Conventionally, a compressor that uses the pressure difference inside the compressor to supply oil,
In particular, for refrigerant compressors where the oil sump that collects the refrigeration oil separated from the discharged refrigerant gas at the bottom of the compressor is located at the furthest upstream side of the 1-meter oil supply path, the viscosity of the refrigeration oil in the oil sump is high immediately after the compressor is started when it is cold. Therefore, it is difficult to flow, and the pressure difference between the upstream and downstream sides of the oil supply passage is also small, so the amount of oil supplied is extremely small, which can cause seizure of the sliding parts. As a countermeasure to this, increasing the cross-sectional area of the oil supply passage will conversely increase the temperature of the refrigerating machine oil during steady operation, and the viscosity of the refrigerating machine oil will be low, making it easier for the refrigerating machine oil to flow. This increases the pressure difference between the compressors and the amount of oil supplied.As a result, a large amount of refrigerating machine oil and acid flows from the discharge pressure side to the suction pressure side inside the compressor, resulting in a reduction in compression efficiency.

Purpose of the Invention The present invention solves the above-mentioned drawbacks by providing an electric heater in a throttling mechanism using a shape-memory alloy material in the middle of the differential-pressure oil supply passage to adjust the opening degree of the differential-pressure oil supply passage. Seven objectives are to improve.

Structure of the Invention The present invention is a differential pressure lubrication system that utilizes the pressure difference between the insides of a compressor to supply lubricating oil to each sliding part, or to pass a cooling medium through the sliding parts.
An opening adjusting passage is provided in the middle of the differential pressure oil supply passage, which is made of a shape memory alloy material that has the characteristic that the coefficient of linear expansion rapidly decreases when the temperature exceeds the set temperature. Inside the temperature adjustment JFn path, in the vicinity of the pipe, there is provided an electric heater whose energization is controlled by a compressor operation sensor such as a temperature sensor, a pressure sensor, or a spindle rotation sensor, and its control device.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1, 2, and 3.

FIG. 1 shows an open horizontal rolling piston type rotary refrigerant compressor, in which side plates 2. Side plates 1 and 3 are arranged, a needle bearing 4 and a thrust bearing 5 are mounted on the side plate 3, and an oil case 7 having an oil suction passage 6 is arranged at the end thereof. At the bottom of the compressor is an oil reservoir 8, and on the upstream side of the oil suction passage 6 is an adjustment passage 9 which has a throttling mechanism as shown in Figs. 2 and 3 using a shape memory alloy.
However, it is installed in a state where it is immersed in the oil sump 8. A band-type electric heater 25 attached to the outer periphery of the oil case 7 so as to surround the trench adjustment passage 9 is energized and controlled by a control device 27 that receives a signal from a temperature sensor 26 attached to the outer lower surface of the oil reservoir 8.

The adjustment passage 9 is controlled by energization heating of an electric heater so that its opening degree is opened when the refrigerating machine oil temperature in the oil reservoir 8 does not reach the set temperature, and the opening degree is narrowed when the refrigerating machine oil temperature reaches the set temperature.

An eccentric shaft 11 is supported by the side plates 2 and 3 via a needle bearing 4 and a needle bearing 10, a piston 13 is loosely fitted inside the cylinder 12 of the cylinder block 1, and a partition vane (not shown) is connected to the piston 13. It is pressed by a spring (not shown) so that it is always in contact with.

An oil supply passage 14 is provided on the reaction force driving side of the eccentric shaft 11, and a shaft sealing device 16 is installed on the power driving side of the eccentric shaft 11 and the shaft sealing space 15 of the side plate 2. A grade side passage 17 is provided in the side plate 2, and the shaft sealing space 15 communicates with the throttle j-1'l passage 18.
Cylinder 12 is also leaking oil. Also, side plate 2
is welded and fixed to the shell 19, and the space surrounded by the shell 19 and the side plate 2 is a discharge side space 20.

Further, a small gap is formed between the cylinder-side end surface 21 of the side plate 2 and the eccentric end surface 22 of the eccentric shaft 11.

The oil reservoir 8 and the cylinder 12 are connected to an oil suction passage 6. Refueling iJn road 14. Air gap between piston 13 and eccentric shaft 11 1”rJJ
23 , 24 , gap between needle bearings 10 .

Shaft seal space 15. Throttle passage 18. The passage of the suction side passage 17 is continuous i+Th.

Figures 2 and 3 show a band-type electric heater 2 in an adjustment passage 9 that uses a shape memory alloy in the oil suction passage and has a throttling mechanism.
This is an example of winding 6.

FIG. 2 shows the guide hole 31 of the oil suction part 7a of the oil case 7.
A valve body 33 with an oil passage 32 is housed inside the valve body 3.
Below 3, the coefficient of linear expansion is the set temperature (for example, 50'C)
The coil spring 34 made of a shape memory alloy material with the characteristic of rapidly increasing is arranged in the oil passage 35 above the valve body 33, and the linear expansion coefficient Ua (the linear expansion coefficient does not change much due to temperature change) is A cap 38 is provided with a coil spring 36 having special characteristics, and an oil passage 37 is provided at the open end of the oil suction portion 7a.The cap 38 is press-fitted into the guide hole 31 to support the coil spring 34, and the hole diameter of the oil passage 35 is equal to that of the guide hole. 31 and larger than the oil suction passage 6, step portions 39 and 40 are provided at each connection portion, the coil spring 36 is supported by the step portions 40, and the outer diameter of the valve body 33 is smaller than the hole diameter of the valve body 33. An elastic ring 41 is attached to the peripheral end, and when the electric heater 26 is energized, the coil spring 34 is heated through the oil suction part aa, increasing the elastic force of the coil spring 340 to move the valve body 33 into the guide hole. This is an example of pushing up to the upper end of 31 and blocking the oil supply passage.

FIG. 3 shows a mechanism opposite to that shown in FIG. 2, namely, a coil spring 342L made of a shape memory alloy is on the downstream side of the oil supply passage, and a coil spring 36a having normal spring characteristics of IIM is on the upstream side of the oil supply passage. 33a respectively.
1. In this configuration, immediately after starting the compressor when it is cold, the oil sump 8
The refrigerating machine oil temperature is also low, and there is no leakage to the electric heater 25. The opening degree d of the adjustment passage 9 using the hollow metal ablation device is wide open. The highly viscous refrigerating machine oil flows through the adjustment passage 9 due to the differential pressure between the discharge side space 20 and the suction side passage 17. Refueling passage 1
4. Space 23. Space 24, shaft sealing space 16. Aperture 1 way 1
8. The refrigerating machine oil flows into the cylinder 12 through the suction side passage 17 and lubricates the sliding part 1 (11) on the way. The refrigeration oil separated from the gas is collected in an oil sump 8 at the bottom.

If the refrigerating machine oil temperature rises above the set temperature after continued operation or startup during hot conditions, or if the electric heater 25 is energized, the adjustment passage 9
When the adjustment passage 9 is heated to a set temperature of 1, the passage cross section of the adjustment passage 9 is narrowed and becomes smaller. Since the refrigerating machine oil, which has a low viscosity and is easy to flow, has a predetermined pressure difference, it flows from the oil reservoir 8 through the oil supply passages of various parts into the cylinder 12, and repeats the same circulation as described above.

If the amount of electricity supplied to the electric heater 26 is further increased for a certain period of time after the compressor is stopped, and the temperature of the adjustment passage 9 is raised, the throttle passage can be shut off.

Note that the same effect can be obtained by using the pressure sensor 1 or the spindle rotation sensor instead of the temperature sensor.

Effects of the Invention When the pressure difference between the suction side pressure and the discharge side pressure is small, such as immediately after compressor operation, and the temperature of the refrigerating machine oil (lubricating oil) is low and the viscosity is high and it is difficult to flow, it is necessary to By using a shape memory alloy material and heating it with an electric heater installed nearby, the opening of the oil supply passage is increased to create conditions for easy flow of lubricating oil, and the suction side pressure and discharge side pressure are In situations where the pressure difference is large, the lubricating oil temperature is high, the viscosity is low, and it flows easily, the opening of the oil supply passage can be narrowed down to reduce the Constant or arbitrary amount of refueling is nf
It is Noh. In particular, when there is a sufficient differential pressure between the discharge side and the suction side of the compressor, such as immediately after the compressor stops operating, and when the lubricating oil temperature is high and the viscosity is low, unnecessary lubricating oil Inflow into the suction side can also be prevented by blocking the opening adjustment passage by heating with an electric heater. In this way, by using a shape memory alloy material, the opening adjustment passage can be arbitrarily adjusted from the blocked state to the fully open state by heating the opening adjustment passage with an electric heater, making it possible to ensure maximum oil supply. , the lubricating oil flowing from the upstream side to the downstream side of the differential pressure oil supply passage can be minimized, and the liquid Li inside the cylinder can be reduced as much as possible.
It is possible to prevent shrinkage and damage to the compressor, and the operating load can be reduced. In addition, in the case of a gas compressor, the present invention provides excellent effects such as eliminating the need for any component structure for efficiently separating the lubricating oil mixed and compressed with the gas from the compressed gas.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a compressor having an oil supply device according to an embodiment of the present invention, FIG. FIG. 3 is a longitudinal cross-sectional view of an opening adjustment passage portion of a compressor oil supply device in an embodiment. 1...Norinda Pronok, 2...Side plate, 3...Side plate, 7...
Oil case, 8... Oil reservoir, 9... Adjustment passage (opening adjustment passage), 11... Eccentric shaft, 12... Cylinder, 13... ... Piston, 16 ... Shaft sealing device, 25 ... Electric heater, 26 ... Temperature sensor (compressor operation sensor),
2Y...Control device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (1)

[Claims] A differential pressure oil supply passage is configured to supply lubricating oil to each sliding part by utilizing the pressure difference between the insides of the compressor, or to pass a cooling medium. An opening adjustment path made of a shape memory alloy material having the characteristic that the coefficient of linear expansion rapidly increases or decreases when the temperature exceeds the limit is provided, and a temperature sensor is installed inside or near the opening adjustment path.
Or a compressed livestock oil system equipped with an electric heater whose energization is controlled by a compressor operation sensor such as a pressure sensor or a spindle rotation sensor and its control device.