JPH06346864A - Horizontal type scroll compressor for helium - Google Patents

Abstract

PURPOSE:To cool a motor efficiently not only by compressed gas but also by oil so as to reduce the temperature rise of the motor by connecting a discharge opening, disposed at a fixed scroll, to an extension tube, and opening the opening end of the extension tube in the vicinity of the motor. CONSTITUTION:Both fixed and turning scrolls 1, 5, which are compression elements, are enclosed in a closed container 31. A motor 17 for driving the turning scroll 5, and the axis of a crankshaft 19 driven by the motor 17 are rotatably supported in the horizontal direction. Oil filling mechanism is further disposed to fill oil in an oil reservoir 34 at the inner bottom part of the closed container 31, into the intake pipe 11 of a compressor or into a compression chamber during compression through an oil cooler. In such constitution, a discharge opening 2 disposed at the fixed scroll 1 is connected to an extension tube 70, and the opening end 70a of the extension tube 70 is opened in the vicinity of the motor 17. The motor 17 is thereby cooled efficiently not only by compressed gas but also by oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal hermetic scroll compressor for helium gas compression used in a helium refrigeration system.

[0002]

2. Description of the Related Art A horizontal hermetic scroll compressor for helium used in a conventional helium refrigerating apparatus is, for example, as disclosed in Japanese Patent Laid-Open No. 4-321788, a horizontal scroll compressor for refrigeration and air conditioning. It uses a similar structure. That is, a fixed scroll and a revolving scroll that are compression element parts are provided in the closed container, and a gas discharge chamber and an electric motor chamber are formed by dividing the gas discharge chamber and the electric motor chamber toward a side end opposite to the side end of the closed container, The crankshaft driven by an electric motor in the electric motor chamber for driving the orbiting scroll has a horizontal axis. Further, an oil reservoir is provided at the bottom of the gas discharge chamber and the electric motor chamber, and an oil supply pipe for supplying lubricating oil to the bearing of the compressor is opened in the oil in the oil reservoir at the bottom of the electric motor chamber. Furthermore, a gas passage that connects the gas discharge chamber and the electric motor chamber is provided at the upper outer edge of the fixed scroll and the frame, and an oil passage that connects the gas discharge chamber and the electric motor chamber is provided at the lower outer edge of the fixed scroll and the frame. . When used for helium gas compression, in addition to the above configuration, the oil in the oil sump at the bottom of the electric motor chamber is cooled through the oil cooler and throttle device to cool the compressed gas. Is equipped with an oil injection mechanism for injecting oil into the compression chamber.

[0003]

In the prior art, as shown in FIG. 3, most of the oil in the compressed gas discharged from the discharge port 2 is separated in the discharge chamber 32, and is transferred to the bottom of the closed container 31. I was guided. Therefore, since the electric motor section is cooled only by the compressed gas, there is a problem that the cooling is insufficient and the temperature rise of the electric motor is large.

An object of the present invention is to reduce the temperature rise of the electric motor of the horizontal scroll compressor for helium.

[0005]

The above object is achieved by connecting the discharge port of the fixed scroll to an extension pipe and opening the open end of the extension pipe near the electric motor.

[0006]

Since the open end of the extension pipe connected to the discharge port of the fixed scroll is opened near the electric motor, the oil discharged together with the compressed gas also flows into the electric motor section. Therefore, since the electric motor can be cooled by the oil in addition to the compressed gas, the temperature rise of the electric motor can be suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. Figure 1
[FIG. 4] is a cross-sectional view of a horizontal hermetic scroll compressor showing an embodiment of the present invention, showing a case where oil is injected into a compression chamber during compression for cooling compressed gas.

The present compressor is a horizontal hermetic compressor that employs a high-pressure chamber system in which a hermetically sealed container is in a high temperature and high pressure atmosphere.

In FIG. 1, a compressor section 100 is housed at the right end of the closed container 13, and an electric motor section 17 is housed at the left end. An oil injection mechanism connected to an oil injection pipe 40 for cooling the helium gas, which is a working gas, is provided in the scroll compression element section, and the compressor section is moved toward the opposite side end from the side end of the closed container. 100 and the electric motor chamber 33 are formed by being divided by the frame 15, and an oil sump 3 is provided below both chambers.
4, an electric motor 1 for driving the orbiting scroll 5
(EN) Provided is a horizontal type hermetic scroll compressor in which the axis of a crankshaft 19 driven by 7 is set in the horizontal direction.

In the compressor section 100, a fixed scroll member 1 and an orbiting scroll member 5 are meshed with each other to form a compression chamber (closed space) 7. The fixed scroll member 1 is composed of a disk-shaped end plate 1a and a wrap 1b which stands upright on the disk-shaped end plate 1a and is formed in a special curve. The fixed scroll member 1 has a discharge port 2 at the center thereof and a suction port 3 at the outer peripheral portion thereof. The scroll wrap is formed by the special curve as shown above. The orbiting scroll member 5 is composed of a disk-shaped end plate 5a, a wrap 5b standing upright on the end plate 5a and having the same shape as the fixed scroll wrap, and a boss 5c formed on the end plate lap surface. The end plate 5a of the orbiting scroll 5 is provided with pores 29,
As a result, the pressure of the back pressure chamber 36 existing on the rear surface of the end plate of the orbiting scroll 5 is set to an intermediate pressure between the suction pressure and the discharge pressure, and the force for pressing the orbiting scroll 5 toward the fixed scroll 1 side is obtained.

The frame 15 has a bearing portion formed at the center thereof,
The rotary shaft 19 is supported by the bearing portion, and the eccentric shaft 20 at the tip of the rotary shaft is inserted into the boss 5c so that the eccentric shaft 20 can rotate. Further, the fixed scroll member 1 is fixed to the frame 15 by a plurality of bolts, and the orbiting scroll member 5 is supported on the key pedestal portion 15m of the frame 15 by the Oldham mechanism 10 including the Oldham ring and the Oldham key, and the orbiting scroll member 5 is fixed. Scroll member 1
On the other hand, it is formed so as to make a turning motion without rotating.

A suction pipe 11 is connected to the suction port 3 of the fixed scroll member 1 by penetrating the closed container 31b, and an extension pipe 70 is connected to the discharge port 2 of the fixed scroll member 1.
The opening 70a opens near the electric motor 17 in the electric motor chamber 33. The electric motor chamber 33 communicates with the discharge pipe 16 penetrating the side end 31c of the closed container 31. Then, the oil passage 27 provided at the lower outer edge portion of the fixed scroll member 1 and the oil passage 5 provided at the lower outer edge portion on the frame 15 side in conformity with the oil passage 27.
0 to communicate with the oil sump 34 on the side of the electric motor chamber 33. In the figure, the solid line arrow shows the flow direction of helium gas, and the broken line arrow shows the flow direction of oil.

Next, an oil injection mechanism for cooling the compressed gas will be described with reference to FIG.

In order to inject oil into the compression chamber 7 formed by both scroll members 1 and 5, the oil injection pipe 40 is connected to the tooth groove portion of the end plate portion 1a of the fixed scroll 1 and the oil injection hole 1w. On the side cover 31c of the closed casing 31 on the side of the electric motor chamber 33, a downwardly curved oil take-out pipe 67a for taking out oil from the lower oil sump 34 in the chamber 33 is provided with an oil pipe outside the machine through the oil take-out port 67. This oil pipe 51 is connected to the expansion device 81 via the oil cooler 80 and to the oil injection pipe 40 penetrating the compressor side cover 31b of the closed container 31. .
Here, the flow of gas and oil in the closed type machine will be briefly described. Helium gas is directly sucked into the scroll compression element portion from the suction pipe 11 through the suction chamber 22, and the pressure and temperature are gradually increased by the compression action of the scroll members 1 and 5.

The gas, together with the cooling oil injected during the compression by the oil injection hole 1w, has a discharge port 2 at the center of the fixed scroll 1.
To the inside of the extension pipe 70, and flows out from the opening end 70a of the extension pipe opened near the electric motor 17 toward the electric motor 7 to cool the electric motor 17. The gas and oil that have cooled the electric motor 17 are separated here, the gas flows from the electric motor 17 into the discharge pipe 16 and is discharged, and the oil falls to the bottom of the closed container 31 and collects in the oil sump 34.

The oil 34b in the oil sump 34 is again guided to the outside of the machine from the lower end of the closed container side end 31c, and is again injected into the compression chamber 7 via the oil cooler 80. Rotating shaft 19
A central lateral hole 13 for supplying oil to each bearing is formed in the rotary shaft 19.

Reference numeral 23 is an oil supply pipe which connects the rotary shaft 19 and the bottom oil sump 34. The lower end of the oil supply pipe 23 immersed in the oil sump 34 of the lubricating oil 34b receives the high discharge pressure Pd, while the downstream slewing bearing 39 and main bearing 46 are provided.
Around (a), the intermediate pressure Pm, which is the pressure in the middle of compression, is received by the pores 29 provided in the swivel end plate 5a.
Due to the pressure difference of d−Pm), the lubricating oil 34b in the oil sump 34 at the bottom of the container rises in the oil supply pipe 23.

FIG. 2 is a vertical sectional view of a horizontal scroll compressor for helium showing another embodiment according to the present invention.

2 is different from FIG. 1 in that an extension pipe 70 is provided.
Through the cooler 71 outside the compressor, and then the extension pipe 70
The open end of the electric motor 17 is branched into 70a and 70b and opened near one end and the other end of the electric motor 17, respectively. As a result, the gas and oil can be cooled by the cooler 71.
The cooling effect of 7 can be improved. Further, since the open end of the extension pipe is branched so that both ends of the electric motor 17 can be cooled, the electric motor 17 can be uniformly cooled and a sufficient cooling effect can be obtained.

[0020]

According to the present invention, the discharge port of the fixed scroll is connected to the extension pipe, and the opening end of the extension pipe is opened near the electric motor. Flow into. Therefore, since the electric motor can be cooled by the oil in addition to the compressed gas, the temperature rise of the electric motor can be suppressed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a horizontal scroll compressor for helium according to the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing a conventional horizontal scroll compressor for helium.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed scroll, 2 ... Discharge port, 5 ... Orbiting scroll, 17 ... Electric motor, 34 ... Oil sump, 70 ... Extension tube, 70
a, 70b ... Open end of extension pipe, 71 ... Cooler.

Claims (1)

[Claims] 1. A hermetically sealed container comprising a fixed scroll and a orbiting scroll, which are compression element parts, and horizontally supports an electric motor for driving the orbiting scroll and an axial center of a crankshaft driven by the electric motor. In addition, in a horizontal scroll compressor for helium equipped with an oil injection mechanism for injecting oil in an oil reservoir provided at the bottom of the closed container into an intake pipe of the compressor via an oil cooler or a compression chamber in the middle of compression A horizontal scroll compressor for helium, wherein a discharge port provided in the fixed scroll is connected to an extension pipe, and an opening end of the extension pipe is opened near the electric motor.