JPH10220890A - Helium compressor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration of a pipe and further reduce vibration of a helium compressor itself by a method wherein as a compressor of a helium compressor device, a scroll compressor is applied and a pressure tank is installed at a midway part of a pipe between a gas inlet of the helium compressor device and a gas inlet of the scroll compressor. SOLUTION: A helium compressor 100, a cooling device 56 for cooling gas and oil, an oil separator 23 and an adsorbing device 95 for adsorbing oil substance in the gas are stored in one package 200a so as to constitute a helium compressor device 255. In this case, as the helium compressor 100, a scroll compressor 400 is applied to produce a low vibration. In addition, a pressure tank 90 is arranged at the midway part of a pipe between a gas inlet section 220 of the helium compressor device 255 and a gas inlet section 17a of the scroll compressor and a flow regulating means 91a made of metallic net of several tens mesh is installed at the gas inlet section 91a of the pressure tank 90. With such an arrangement as above, the pressure tank 90 is applied with a function acting as a buffer tank to restrict a vibration of pipe low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a helium compressor unit.

[0002]

2. Description of the Related Art A helium refrigeration system is disclosed in Japanese Patent Laid-Open No. 4-27814.
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. 6, the conventional helium compressor unit uses a scroll compressor or a rotary type or reciprocating type compressor as a helium compressor with an improved cooling method. Was. On the expander side, there is a reciprocating sliding portion (piston portion) for adiabatically expanding the helium gas, and its cycle is around 1.2 Hz. The operation cycle of the reciprocating sliding portion (piston portion) directly causes a relatively large pressure fluctuation in the suction pipe on the compressor unit side.

[0003]

In such a case, the pressure fluctuation in the suction pipe provided in the helium compressor unit is as large as several kg / cm ² , the pressure pulsation width is large, and the pipe vibration and the helium compressor itself There is a problem that the influence on the increase in vibration and noise increase is large. On the other hand, in an area where the power frequency, which is a commercial power source, is 50 Hz, the refrigeration capacity is reduced by a ratio of the rotation speed (for example, 20%) as compared with an area where the power frequency is 60 Hz. In order to obtain the same refrigeration capacity, it is necessary to select a helium compressor that is one rank higher than the compressor capacity (horsepower) of the helium compressor in the 60 Hz area. For this reason, there has been a problem that the cost of the helium compressor in the region where the power supply frequency is 50 Hz is relatively high, and the size of the entire helium compressor unit is large, so that the size and weight cannot be reduced.

There are problems and problems in the quality and reliability of such helium compressor products, as well as in terms of cost and usability due to lack of capability.

An object of the present invention is to provide a helium compressor unit and a helium compressor unit using a scroll compressor.

[0006]

In order to achieve this object, the present invention provides a helium compressor, a cooler for cooling gas and oil, an oil separator, and an adsorber for adsorbing oil in gas. A helium compressor unit provided inside the package, wherein the compressor is a helium compressor using a scroll compressor, and a pressure is generated in the piping between the gas inlet of the helium compressor unit and the gas inlet of the scroll compressor. A tank is provided, and a rectifying means is attached to a gas inlet or a gas outlet of the pressure tank. Further, the internal volume of the pressure tank is set to an appropriate ratio with respect to the internal volume of the closed container of the scroll compressor (in general, the ratio is set to a ratio of 0.5 or more). The helium compressor unit using the scroll compressor is configured. further,
In the helium compressor unit, a control panel is provided from a commercial power supply to a power supply section of the scroll compressor, and the control panel is provided with power switching means for switching to a commercial power inverter only when the power frequency is 50 Hz. Is 50H
A helium compressor unit characterized in that a helium compressor driven by an inverter is operated only in the z area.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 9 and Tables 1 and 2 for explanation. FIG. 1 shows a helium compressor unit 255 including a helium compressor 100, a cooler 56 for cooling gas and oil, an oil separator 23, and an adsorber 95 for adsorbing oil in a gas inside one package 200a. It is. In FIG. 1, the compressor 1
Reference numeral 00 denotes a helium compressor using a scroll compressor 400. A pressure tank 90 is provided in the piping between the gas inlet 220 of the helium compressor unit 255 and the gas inlet 17a of the scroll compressor. Rectifying means 91a is mounted on the gas inlet 91a. Inside the package 200a, a control panel 80 is provided from a commercial power supply unit to a power supply unit of the scroll compressor 400. The control panel 80 is provided with power supply switching means 82 for switching to a commercial power supply inverter (see FIG. 7) only when the power supply frequency is 50 Hz. In addition, reference numerals 60 and 61 are discharge side pipes. Reference numeral 55 denotes an oil pipe, which merges with the pipes 28 and 25.
Reference numeral 89 denotes a power supply line connecting the control panel 80 side and the compressor 400 side.

FIG. 2 is a longitudinal sectional view of an oil-filled hermetic scroll compressor used for helium used in the present invention, and a lubrication system diagram for cooling helium gas. FIG.
It is a top view which combined both scrolls 5 and 6. FIG.
In the upper part of the sealed container 1, a scroll compressor unit 2 is provided.
The motor unit 3 is housed below. The inside of the closed container 1 is divided into an upper chamber 1a and a motor chamber 1b. As shown in FIG. 3, in the scroll compressor section 2, the fixed scroll 5 and the orbiting scroll 6 are meshed with each other to form compression chambers (closed spaces) 8a and 8b. The fixed scroll 5 is composed of a disk-shaped end plate 5a and a wrap 5b which stands upright and is formed into an involute curve and an arc curve. The fixed scroll 5 has a discharge port 10 at the center and a suction port 14 at the outer periphery. . The orbiting scroll 6 includes a disc-shaped end plate 6a, an upright wrap 6b formed in the same shape as the wrap of the fixed scroll, and a boss 6c formed on an opposite lap surface of the end plate. A circular groove 42 is provided on the tooth bottom 6 m of the orbiting scroll 6. The frame 4 has a bearing portion formed at the center thereof, and the rotating shaft 7 is supported by the bearing portion. The eccentric shaft 7a at the tip of the rotating shaft is inserted into the boss portion 6c so as to be capable of turning movement. A fixed scroll 5 is fixed to the frame 4 by a plurality of bolts. The orbiting scroll 6 is supported on the frame 4 by an Oldham mechanism 33 including an Oldham ring 33a and an Oldham key. It is formed so as not to make a turning motion. A motor rotor unit is integrally connected to the lower part of the rotating shaft 7. A vertical suction pipe 17 is connected to the suction port 14 of the fixed scroll 5 through the closed casing 1, and the upper chamber 1 a in which the discharge port 10 is opened is connected to the motor chamber 1 via passages 18 a and 18 b.
b. The electric motor chamber 1b communicates with a discharge pipe 18 penetrating through the closed casing 1. An oil separator 23 is connected to a gas cooler 56 via a pipe 29. The order of installation of the oil separator 23 and the cooler 56 in the discharge pipe is opposite to that in FIG.

The upper and lower portions of the motor chamber 1b communicate with each other via a gap between the motor stator 3a and the side wall of the closed casing 1 and a gap between the motor stator 3a and the motor rotor 3b. An O-ring 53 is provided between the suction pipe 17 and the fixed scroll 5 to seal the high pressure portion and the low pressure portion. A check valve 13 is provided in the suction pipe 17 to prevent the rotating shaft 7 from rotating backward when the compressor is stopped, and to prevent the lubricating oil in the sealed container from flowing out to the low pressure side. It is to prevent.

A space 35 (hereinafter, referred to as a back pressure chamber) surrounded by the compressor unit 2 and the frame 4 is formed on the back surface of the end plate of the orbiting scroll 6, and the end plate of the orbiting scroll is formed in the back pressure chamber 35. An intermediate pressure between the suction pressure and the discharge pressure is introduced through a fine hole (not shown) formed in the orifice, thereby giving an axial force for pressing the orbiting scroll 6 against the fixed scroll 5.

The lubricating oil 24 is stored at the bottom of the sealed container 1 and is sucked up into the oil suction pipe 7d by a differential pressure between the high pressure in the closed container and the intermediate pressure in the back pressure chamber 35. After that, it rises in the eccentric hole in the rotary shaft 7 and is supplied to the slewing bearing 32, the main bearing 4a and the auxiliary bearing 4b.
The oil supplied to each bearing portion is injected into the compression chamber 8 of the scroll wrap through the back pressure chamber 35, mixed with the compressed gas, and then discharged to the upper chamber 1a together with the discharge gas.

At the bottom of the sealed container 1, lubricating oil 24
An oil take-out pipe 28 is provided to take the oil out of the vessel. The oil take-out pipe 28 is connected to the bottom of the oil separator 23 and the oil cooler 26.

An oil injection pipe 21 for injecting oil into the compression chamber 8 in the middle of the compression of the scroll compressor unit 2 is provided at an upper portion of the closed casing 1. The oil injection pipe 21 communicates with the compression chamber 8 via a working gas cooling oil injection hole 22 formed in the end plate 5 a of the fixed scroll 5.
The oil extraction pipe 28 and the oil injection pipe 21 are connected to the oil cooler 2
6 and an oil pipe 25 provided with an expansion device 27 interposed therebetween.

With this configuration, when the rotating shaft 7 directly connected to the motor rotor 3b rotates and the eccentric shaft 7a rotates eccentrically,
The orbiting scroll 6 performs an orbiting motion via the orbiting bearing 32. Due to this swirling motion, the compression chambers 8a and 8b gradually move to the center and the volume decreases. The working gas enters the suction chamber 5f from the suction pipe 17 via the suction port 14, and the oil lubricating the bearings flows into the suction chamber 5f from the outer peripheral gap of the orbiting scroll 6 and mixes with the working gas. The working gas containing the working gas cooling oil injection hole 22 as the oil passing through the bearing is compressed in the compression chamber, discharged from the discharge port 10 to the upper chamber 1a, and passes through the passages 16a and 16b. And flows into the motor room 1b. The solid arrows indicate the flow of the working gas, and the dashed arrows indicate the flow of the oil. The working gas and oil flowing from the narrow passages 16a and 16b into the motor chamber 1b in the wide space have a rapid decrease in flow velocity and a change in the flow direction, so that most of the oil contained in the gas is separated. The working gas flows out into the discharge pipe 18, and the oil flows down through a gap around the outer periphery of the motor rotor and accumulates at the bottom of the closed casing 1. Lubricating oil 24 stored at the bottom of the closed container 1
Are the pressure (discharge pressure) in the closed container 1 and the compression chambers 8a, 8
The oil flows into the oil take-out pipe 28 by a pressure difference from the pressure b (pressure equal to or lower than the discharge pressure). The oil that has flowed into the oil take-out pipe 28 reaches the oil cooler 26 through the oil pipe 25, and is appropriately cooled, then passes through the expansion device 27, and then flows into the oil injection pipe 21 and the working gas cooling oil injection hole. It is injected into the compression chamber via 22. The oil injected into the compression chamber serves to cool the working gas in the compression chamber and to lubricate sliding parts such as the scroll wrap tip. Then, after the oil is compressed together with the working gas, during the discharge process, the discharge port 10 is formed through the grooves 42 and 43 set on the tooth bottom surfaces of both scrolls.
The fluid is more smoothly discharged to the upper chamber 1a, separated from the working gas in the electric motor chamber 1b, and accumulates at the bottom of the closed casing 1 as described above. The lubrication of each bearing 32, 4a is performed in the closed container 1
The pressure difference between the internal pressure and the pressure in the back pressure chamber 35 (intermediate pressure) is performed through the oil suction pipe 7d and the oil supply hole 7c in the rotary shaft 7. The cooling oil injected into the compression chambers 8a and 8b from the oil injection pipe 21 through the working gas cooling oil injection hole 22 is boosted to a high discharge pressure together with the working gas by the compression action of both scrolls. It is discharged into the closed container 1. Since the inside of the closed container 1 has a relatively large space, the closed container 1 itself has an oil separating function, and most of the injected oil is separated from the gas in the closed container 1, and At the bottom of the container.

By providing such a piping path, since a path different from the bearing oil supply path is provided, a special oil supply pump is not required, and a stable amount of cooling oil can be supplied at all times. For this reason, the cooling operation to the helium gas can always be reliably performed.

FIG. 4 is a longitudinal sectional view of the pressure tank 90, and FIGS. 5 and 6 are explanatory views for explaining the operation and effect of the present invention. The horizontal axis in FIG. 5 represents the ratio of the internal volume VB of the pressure tank 90 to the internal volume Vc of the closed container of the scroll compressor. In FIG. 4, rectifying means 91a is mounted inside the gas inlet 92a and the gas outlet 92b of the pressure tank 90.
The rectifying means 91a has a structure in which a wire mesh member, for example, a wire mesh material of several tens of meshes is appropriate and is struck from the inside so as to cover the gas inlet / outlet of the pressure tank. As shown in FIGS. 5 and 6, by adopting the above structure, the pressure fluctuation ΔPs in the suction pipe provided in the helium compressor unit has a function as a buffer tank even when a pressure tank is installed. It can be seen that the pressure pulsation width becomes smaller, and there is an effect of suppressing the vibration of the pipe and the vibration of the helium compressor itself. This is because, when the pressure fluctuation ΔPs in the suction pipe is smaller, the torque fluctuation acting on the scroll compressor and the fluctuation value of the rotation torque (load) acting on the Oldham mechanism 33 also become smaller. This is also a beneficial effect in terms of the reliability of the scroll compressor, such as a wear reducing effect of the Oldham mechanism 33. Since the wire netting member of the rectifying means 91a is a wire netting material of, for example, several tens of meshes, it also has a function of removing foreign substances in gas.

In FIG. 6, an example of the pressure fluctuation ΔPs in the suction pipe when the internal volume of the pressure tank 90 is approximately 0.5 with respect to the internal volume of the closed vessel of the scroll compressor is compared with the conventional type. Is shown. The vibration reduction effect further reduces noise and leads to a ripple effect in which a quiet unit can be obtained. The present invention also provides that the internal volume of the pressure tank 90 is set to be approximately 0.5 or more with respect to the internal volume Vc based on the internal volume of the closed vessel of the scroll compressor of the high-pressure chamber type. It is a feature of.

In FIG. 7, a control panel 80 is provided between the commercial power supply section 88 and the power supply section 400a of the scroll compressor 400 according to the power supply method for the compressor motor 3 of the helium compressor unit. Has a power frequency of 50Hz
Power supply switching means 82 for switching to the commercial power inverter 85 only in the case of (1) is provided. If the frequency of the power supply 88 is 50
Connect the inverter 85 only in the
Drives the helium compressor.
When the frequency of the power supply 88 is in the 60 Hz area, the inverter 85 is not energized, and the commercial compressor operates the scroll compressor at a constant speed. That is, from the commercial power supply unit 88 as a power supply unit of the scroll compressor 400,
The control panel 80 is provided with a power supply switching means 85 for switching to a commercial power inverter only when the power supply frequency is 50 Hz. By driving the inverter 85, the operating frequency of the compressor is changed to a variable speed of 60 Hz and the scroll compressor 400 for helium 400 is driven. Is to drive. According to the present invention, the compressor is always operated at an operation frequency of 60 Hz, the required internal volume of the pressure tank is the same, the pressure pulsation width is constant regardless of the operation frequency, and problems such as the possibility of pipe resonance occur. Is also gone.

FIGS. 8 and 9 are explanatory diagrams for explaining the operation and effect of the present invention shown in FIG. From FIG. 8, according to the present invention, the power supply frequency is 6 even in a region where the power supply frequency which is
A refrigeration capacity (helium gas flow rate) equivalent to a 0 Hz area can be obtained. In the area of 60 Hz, a reduction in performance for the inverter efficiency has been a problem in the conventional method. Therefore, FIG.
Therefore, according to the present invention, the effect of improving the coefficient of performance can be obtained as compared with the conventional inverter driving method. In particular, in the area of 60 Hz, a performance improvement corresponding to the inverter efficiency can be obtained.

Table 1 shows the types of motors according to the prior art. In this case, two types of motors, a constant speed motor (type A) and an inverter motor (type B), are required. ing.

[0021]

[Table 1]

On the other hand, Table 2 shows the types of motors according to the present invention. In this case, the motor for constant speed (type A) and the motor for inverter (type A) are common and only one type of motor is required. This means that the motor can be shared.

[0023]

[Table 2]

The motor (type A) is a motor on the assumption that a commercial power supply based on a sine-wave AC power supply is used.

[0025]

【The invention's effect】

(1) Even if a pressure tank in which the pressure fluctuation in the suction pipe provided in the helium compressor unit is small is installed, the pressure pulsation width becomes very small, and the vibration of the pipe and the vibration of the helium compressor itself can be suppressed smaller. The product quality and reliability of the whole helium compressor unit are greatly improved and improved.

(2) The noise is further reduced and a quiet unit is obtained.

(3) The power frequency of the commercial power source is 50H
In the area of z, the refrigerating capacity and the coefficient of performance equivalent to the area of the power supply frequency of 60 Hz can be obtained.

(4) The helium compressor in the area where the power supply frequency is 50 Hz has been relatively expensive so far. However, according to the present invention, the size of the entire helium compressor unit is lower than that of the conventional helium compressor. Coupled with the miniaturization of the tank,
The whole unit can be small and lightweight.

(5) Since the torque fluctuation acting on the helium scroll compressor and the fluctuation value of the rotation torque (load) acting on the Oldham mechanism 33 are also reduced, the wear of the Oldham mechanism 33 is reduced. This also has a beneficial effect on reliability.

[Brief description of the drawings]

FIG. 1 is an external view of a helium compressor unit and an explanatory diagram of internal devices.

FIG. 2 is an explanatory view showing one embodiment of an oil-filled hermetic scroll compressor according to the present invention.

FIG. 3 is a plan view in which scrolls are combined.

FIG. 4 is a longitudinal sectional view of a pressure tank.

FIG. 5 is an explanatory diagram illustrating the operation and effect of the present invention.

FIG. 6 is an explanatory diagram for explaining the function and effect of the present invention.

FIG. 7 is an electric circuit diagram in which a control panel provided with power supply switching means is connected to a drive unit of a scroll compressor.

FIG. 8 is an explanatory diagram of the operation and effect of the present invention.

FIG. 9 is a diagram illustrating the operation and effect of the present invention.

[Explanation of symbols]

17 ... suction pipe, 21 ... oil injection pipe, 25 ... oil pipe, 2
Reference numeral 8: oil removal pipe, 80: control means, 90: pressure tank, 91: rectification means, 400: scroll compressor.

Claims (1)

[Claims] 1. A helium compressor unit comprising a helium compressor, a cooler for cooling gas and oil, an oil separator, and an adsorber for adsorbing oil in a gas in one package, wherein the compressor includes: A helium compressor using a scroll compressor, wherein a pressure tank is provided in a pipe between a gas inlet of the helium compressor unit and a gas inlet of the scroll compressor, and a gas inlet or a gas outlet of the pressure tank is provided. A helium compressor unit characterized in that a rectifying means is mounted on the section.