JPS60237185A - Compressor - Google Patents

Abstract

PURPOSE:To control the circulation of an operating fluid flowing through an oil cooler, invariably keep the temperature of lubricating oil adequate, and keep the circulation quantity of a refrigeration cycle adequate by providing a control valve sensing the outside air temperature for operation on part of the passage of the oil cooler. CONSTITUTION:When the outside air temperature is high in such a season as summer, the coil 29 of a control valve 25a provided on part of a rising pipe 22a outside a closed casing 1 is extended as shown by a solid line, and a needle 28 opens a valve seat 27. Therefore, the operating medium in an oil coolder 20a flows down along the inclination of a heat radiator 21b, and repeats the circulation flowing through the control valve 25a to an oil cooling section 21a to cool the lubricating oil 17. Next, when the outside air temperature becomes low in such a season as winter, the coil 29 is shrunk to lift the needle 28 to the two- dot chain line position and close the valve seat 27. Thereby, the circulation of the operating medium is stopped. Accordingly, the temperature of the lubricating oil is invariably kept adequate, and the refrigerant circulation quantity of the refrigeration cycle can be kept adequate.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compressor used in a refrigeration cycle or the like, and particularly to a cooling device for lubricating oil of the compressor.

Conventional configuration and its problems The conventional configuration will be explained with reference to FIGS. 3 and 4.

1 is a sealed casing, 2 is an electric motor section, and shaft 3
Through the cylinder 4, piston 5, ring 6, main bearing 7
, is connected to a mechanical part main body 1o which is composed of a sub-bearing 8 and an oil supply mechanism 9. 11 is a compression chamber configured within the cylinder 4. 12 is a suction pipe, and 13 is a discharge pipe. The suction pipe 12 directly communicates with the suction hole 14 of the cylinder 4 via the sub-bearing 8, and the discharge pipe 13 is open into the sealed casing 1. Dimension 15 is a discharge hole, which communicates between the compression chamber 11 and the inside of the sealed casing 1 via a discharge valve 16. 17
is lubricating oil stored at the bottom of the sealed casing. 18.
Reference numeral 19 denotes an inlet opening and an outlet opening provided on the wall surface of the sealed casing 1, and each is provided at a position above the oil level of the lubricating oil 17. The inlet opening 18 and the outlet opening 19 communicate with each other through a communication pipe 2o disposed above the sealed casing 1. 21 is the top 20 of the communication pipe 20
' is a heat dissipation part provided in the outlet opening 19, and the inlet opening 18, the outlet opening 19 and the riser pipe 22, respectively.
They communicate via a riser pipe 23. Further, 24 is a heat insulating material for insulating the riser pipe 23. While the compressor is in operation, refrigerant gas flowing from the refrigeration cycle (not shown) through the suction pipe 12 and the suction hole 14 is compressed in the compression chamber 11 as shown by the arrow in the figure, and becomes a high-temperature, high-pressure gas. It is discharged into the sealed goose song 1 via the discharge hole 15 and the discharge valve 16. Most of the high-temperature, high-pressure refrigerant in the sealed casing 1 is discharged from the discharge pipe 13 into the refrigeration cycle, but a portion fills the communication pipe 20 and is condensed and liquefied in the heat dissipation section 21 of the communication pipe 2o. The condensed and liquefied drip refrigerant drips inside the tube of the heat dissipation section 21 due to its own weight, and then flows through the riser tube 22 and the outlet opening 19.
It reaches the inside of the sealed casing 1 through. Due to this dripping of liquid refrigerant, the pressure inside the communication pipe 20 decreases and the airtight casing 1
The high-temperature refrigerant gas inside is replenished into the heat radiating part 21 through the inlet opening 18 and the riser pipe 23.
The flow of high-temperature refrigerant gas toward 1 and the refrigerant partially liquefied in the heat radiation section 21 flow toward the inside of the sealed casing 1 via the riser pipe 22 and the outlet opening 19, as shown by the arrows in FIG. It will occur continuously. At this time, the riser pipe 23
is insulated with a heat insulating material 24, and the refrigerant does not condense and liquefy in the riser pipe 23. Therefore, the riser pipe 23
Liquid refrigerant does not flow back inside.

As a result, liquid refrigerant is always supplied into the hermetic casing 1, and when this liquid refrigerant comes into contact with a high temperature part within the hermetic casing 1 and vaporizes, it removes heat and cools the compressor.

In the conventional example of the above configuration, when the ambient temperature of the compressor is low and there is no need to cool the compressor for reliability reasons, such as during operation in winter, or when the compressor is cooled, the viscosity of the lubricating oil 17 Even if the communication pipe 20 becomes high and performance deteriorates,
The disadvantage is that natural convection occurs inside the compressor, causing problems such as cooling the compressor.

Purpose of the Invention The present invention aims to maintain an appropriate amount of refrigerant circulation in a refrigeration cycle by controlling the amount of circulating working medium flowing through an oil cooler during low outside temperatures such as in winter, and constantly maintaining the temperature of lubricating oil at an appropriate level. purpose.

Structure of the Invention In order to achieve this object, the present invention provides a control valve that operates by detecting the outside air temperature in a part of the flow path of the oil cooler.
It controls the circulation of the working medium flowing through the oil cooler.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted.

Reference numeral 20a is an oil cooler, and an oil cooling part 21a disposed immersed in lubricating oil 17 and a heat radiation part 21b disposed above the outside of the sealed casing 1 are connected in an annular manner by riser pipes 22a and 23a. , a working medium such as fluorocarbon is sealed inside.

25a is a control valve provided outside the sealed casing 1 in a part of the riser pipe 22a. This control valve 26au casing 26 and a valve seat 27 provided inside the casing 26
It consists of a needle 28, a valve seat 27, and a coil 29 whose both ends are fixed to the lower end of the needle 28. The coil 29 is made of a shape memory alloy that expands at high temperatures and contracts at low temperatures.

In the above configuration, when the compressor is operated, the temperature inside the sealed casing 1 increases, and therefore the oil cooler 20a
The oil cooling section 21a also gradually becomes hotter. On the other hand, the heat dissipation section 21
b is relatively low temperature, and the internal working medium is oil cooling part 21.
It is heavier than a.

In this state, when the outside temperature is high, such as in summer, the coil 29 expands, and the valve seat 28 expands, as shown by the solid line in Figure 4.
is open to the public. Therefore, the working medium in the oil cooler 20a flows down as shown by the arrow along the slope of the heat radiation part 21b, passes through the control valve 25a, and is repeatedly circulated to the oil cooling part 21a, thereby cooling the lubricating oil 17. conduct.

Next, when the outside temperature becomes low, such as in winter, the coil 29 contracts, lifting the needle 28 to the position indicated by the two-dot chain line, and closing the valve seat 27. Therefore, the above-mentioned circulation of the working medium is no longer performed.

Therefore, the lubricating oil 17 is not cooled unnecessarily when the outside temperature is low, so it is possible to prevent a decrease in the performance index due to an increase in viscosity, and also to prevent a shortage of refrigerant in the refrigeration cycle due to refrigerant dissolution. be.

Effects of the Invention As is clear from the above explanation, the present invention has an oil cooling section disposed in lubricating oil in a sealed casing and a heat dissipation section disposed outside the sealed casing, which are connected in an annular manner, and a working medium is sealed therein. The oil cooler is equipped with a control valve that closes in response to low outside air temperature in a part of the oil cooler, so unnecessary cooling of the lubricating oil can cause an increase in viscosity. There is no risk of a decrease in performance index due to refrigerant shortage due to refrigerant solvation.
This makes it possible to maintain good efficiency of the compressor and improve reliability.

[Brief explanation of drawings]

Figure 1 is a sectional view of a rotary compressor showing an embodiment of the present invention, Figure 2 is an enlarged sectional view of section A in Figure 1, Figure 3 is a sectional view of a conventional compressor, and Figure 4. 2 is a sectional view taken along the line IV-IV' in FIG. 1. FIG. 1... Sealed casing, 17... Lubricating oil, 20a... Oil cooler, 21a... Oil cooling section, 21b... Heat radiation section, 25a... control valve. Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] A sealed casing housing a compression mechanism, lubricating oil, and electric motor, an oil cooling part placed in the lubricating oil, and a heat dissipation part placed outside the sealed casing are connected in an annular manner, and a working medium is sealed therein. A compressor comprising: an oil cooler; and a control valve that is provided in a part of the oil cooler and closes in response to low outside temperature.