JPH0742685A - Internal high pressure type compressor - Google Patents

Abstract

PURPOSE:To provide an internal high pressure type compressor with high performance capable of changing the substantial displacement of a desuperheater following outside air temperature with simple structure so as to be without lubricating failure and the lowering of refrigerating capacity caused by the change of outside air temperature. CONSTITUTION:An internal high pressure type compressor is provided with a passage for leading refrigerant, discharged from the cylinder 6 of a compression element 3 enclosed in a closed container 2, once out to a cup muffler 16 and then discharging the refrigerant outside of the closed container 2 through the discharge hole 17 of the muffler 16, and a passage for leading the refrigerant, discharged from the cylinder 6, outside of the closed container 2 by a desuperheater 19 to cool the refrigerant and then returning the refrigerant into the closed container 2. The muffler 16 is provided with a control valve 18 actuated by the temperature change so as to open/close the discharge hole 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal high pressure compressor in which a high pressure gas and oil are stored in a closed container.

[0002]

2. Description of the Related Art Conventionally, an internal high pressure compressor of this type has been disclosed in Japanese Utility Model Publication No. 60-9438.
The refrigerant discharged from the cylinder of the compression element housed in the closed container is once discharged to the cup muffler, and then discharged to the outside of the closed container through the discharge hole of the muffler and the air gap of the motor.

On the other hand, there is a structure in which the refrigerant discharged from the cylinder for cooling the discharged gas is discharged to the outside of the closed container by a dissuperheater to be cooled and then returned to the inside of the closed container again.

According to the above structure, the discharge gas can be easily cooled, and the cooling of the motor and the temperature of the discharge gas can be effectively reduced.

[0005]

However, according to the above configuration, the dissuperheater system cannot keep up with changes in the outside air temperature because the cooling capacity of the discharge gas is fixed. Assuming a high price,
Designed to have an appropriate cooling capacity according to this,
When the outside air temperature is actually low, the discharge gas is condensed in the dissuper heater, the liquid refrigerant returns to the compressor, dilutes the lubricating oil, and causes abnormal wear due to poor lubrication, which reduces durability. On the contrary, assuming that the outside air temperature is low, and designing to obtain an appropriate refrigeration capacity in accordance with this, under conditions where the outside air temperature is high, cooling becomes insufficient and the compressor causes an abnormal temperature rise. In the end, there was a problem that lubrication failure was caused due to deterioration of the lubricating oil.

Therefore, in order to solve the above problem, it is necessary to make the capacity of the dissuper heater variable.

For example, a fan for cooling the dissuper heater is provided, and the air flow rate of this fan is controlled according to the outside air temperature, or a flow control valve is provided in the return pipe from the dissuper heater to the compressor so as to respond to the outside air temperature. Although the method of controlling the opening of the flow control valve is conceivable, there is a problem that the structure becomes complicated and the cost increases due to an increase in the number of parts in any case.

The present invention has been made in view of the above problems, and the substantial capacity of the day super heater can be changed in accordance with the outside air temperature with a simple structure, and the lubrication failure caused by the change in the outside air temperature can be achieved. It is an object of the present invention to provide a high-performance internal high-pressure compressor that does not deteriorate in refrigeration capacity.

[0009]

According to the present invention, a refrigerant discharged from a cylinder of a compression element housed in a closed container is once discharged to a muffler and then discharged to the outside of the closed container through a discharge hole of the muffler. And a path for returning the refrigerant discharged from the inside of the cylinder to the outside of the closed container by the dissuperheater and cooling it, and then returning it again to the inside of the closed container. A control valve for opening and closing the hole is provided.

[0010]

The internal high-pressure type compressor of the present invention has the above-mentioned structure, and the discharge hole of the muffler is opened / closed according to the temperature of the compressor, and the flow rate of gas discharged from this discharge hole and the discharge from the muffler to the dissuperheater. Since the control valve operates by the temperature change of the compressor that changes in accordance with the change of the outside air temperature,
As a result, the amount of discharge gas discharged to the outside of the closed container through the discharge hole of the muffler and the amount of discharge gas discharged to the dissuperheater can be changed by the outside air temperature. The control valve is released to increase the amount discharged from the muffler's discharge hole to prevent the discharge gas from condensing in the dissuperheater, diluting the lubricating oil by returning the liquid refrigerant to the compressor, and lubricating it. While preventing abnormal wear due to defects and improving durability, conversely, under high ambient temperature conditions, the control valve closes the discharge hole and guides most of the discharge gas discharged from the cylinder to the day super heater. It is possible to prevent the insufficient cooling by maximizing the discharge gas temperature and prevent the abnormal temperature rise of the compressor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An internal high pressure compressor of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a rotary internal high-pressure compressor. This compressor includes a rotary compression element 3 in a closed case 2,
An electric element 4 for driving this compression element is housed. The compression element 3 includes a cylinder block 5 closely fixed in the closed container 2, an upper frame body 7 and a lower frame body 8 that close a cylinder 6 of the cylinder block 5, and an eccentric portion of a rotary shaft 9. The cylinder block 5 includes a roller 11 that is inserted into the cylinder 6 and transforms and rotates in the cylinder 6, and a vane 12 that constantly abuts the tip of the roller to divide the inside of the cylinder 6 into a high pressure side and a low pressure side.
An intake gas passage 13 that communicates with the inside of the cylinder 6 is formed therein.

Further, the upper frame 7 has a discharge port 14,
Further, a discharge valve 15 is provided, and a cup muffler 16 is attached so as to cover the upper frame body 7. Further, the cup muffu 16 is provided with a discharge hole 17 and a control valve 18 for opening and closing the discharge hole. The control valve is made of a material such as a bimetal or a shape memory alloy which deforms in response to temperature. Therefore, the deforming operation is performed such that the internal temperature of the compressor is detected and the opening / closing of the discharge hole 17 is controlled.

Reference numeral 19 denotes a dissuperheater, which has a function of cooling the discharge gas discharged from the cup muffler 16 to the outside of the closed container 2 through the pipe 20 by the outside air and then returning it back into the closed container 2.

Reference numeral 21 is a suction pipe connected to the suction gas passage 13, and 22 is a discharge pipe.

Here, in the internal high pressure type compressor 1, the inside of the closed case 2 is a high pressure gas chamber.

The internal high pressure type compressor 1 configured as described above
At the discharge port 1 from within the cylinder 6 of the compression element 3
The discharge gas once discharged to the cup muffler 16 via 4 flows as follows due to the difference in temperature of the compressor 1 that follows the difference in outside air temperature.

That is, since the temperature of the compressor 1 is low under the condition that the outside air temperature is low, the control valve 18 is opened and most of the discharge gas led to the cup muffler 16 is discharged from the discharge hole 17 of the muffler 16, The discharge gas is discharged from the discharge pipe 22 through the air gap of the electric element 4, and the discharge gas is hardly introduced into the dissuperheater 19. Therefore, the discharge gas is not condensed in the dissuperheater 19, and the liquid refrigerant is compressed. Dilution of the lubricating oil due to returning to the machine 1 and abnormal wear due to poor lubrication do not occur, and the durability of the compressor can be improved.

On the other hand, on the other hand, when the outside air temperature is high, the temperature of the compressor 1 is also high, so that the control valve 18 is closed and most of the discharge gas led to the cup muffler 16 is the pipe 20.
To the day super heater 19 to cool the discharge gas temperature to the maximum to prevent insufficient cooling and prevent the compressor 1 from rising to an abnormal temperature.

Therefore, the discharge hole 17 of the cup muffler 16
The amount of discharge gas discharged to the outside of the closed container 2 via the heater and the amount of discharge gas discharged to the dissuper heater 19 can be changed by the outside air temperature, and the cup muffler 16
With a simple structure in which the control valve 18 is provided in the internal high-pressure compressor 1, it is possible to provide the internal high-pressure compressor 1 that is not adversely affected by the outside air temperature.

[0021]

As described above, according to the present invention, the discharge hole of the muffler is opened and closed depending on the temperature of the compressor, and the gas flow rate discharged from this discharge hole and the muffler is discharged to the dissuper heater. The gas flow rate can be changed, and the control valve operates due to the temperature change of the compressor that changes following the change of the outside air temperature, resulting in the discharge to the outside of the closed container through the discharge hole of the muffler. The amount of discharged gas that is discharged to the dissuper heater and the amount of discharged gas that is discharged to the dissuperheater can be changed according to the outside air temperature, and under conditions where the outside air temperature is low, the control valve is released to increase the amount discharged from the muffler discharge hole. The discharge gas is prevented from condensing in the dissuper heater, the lubricating oil is diluted due to the liquid refrigerant returning to the compressor, and abnormal wear due to poor lubrication is prevented, improving durability. On the other hand, conversely, when the outside air temperature is high, the control valve closes the discharge hole, and most of the discharge gas discharged from the cylinder is guided to the day super heater to cool the discharge gas temperature to the maximum and insufficient cooling. Prevent
It is possible to prevent an abnormal temperature rise of the compressor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an internal high-pressure compressor.

FIG. 2 is a plan view of a cup muffler.

FIG. 3 is a sectional view of a cup muffler.

[Explanation of symbols]

 1 Internal high pressure type compressor 6 Cylinder 14 Discharge port 15 Discharge valve 16 Cup muffler 17 Discharge hole 18 Control valve 19 Dissuper heater

Claims (1)

[Claims] 1. A refrigerant discharged from a cylinder of a compression element housed in a hermetic container is first discharged to a muffler,
Provided with a path for discharging to the outside of the closed container through the discharge hole of the muffler, and a path for discharging the refrigerant discharged from the inside of the cylinder to the outside of the closed container by a dissuperheater to cool it and then returning it to the inside of the closed container again. An internal high-pressure compressor, wherein the muffler is provided with a control valve that operates according to temperature changes to open and close the discharge hole.