CN202867213U

CN202867213U - Screw type helium compressor

Info

Publication number: CN202867213U
Application number: CN 201220495008
Authority: CN
Inventors: 苏应春; 刘进亮; 李军; 霍正齐; 丁杰; 郭秋林; 夏航
Original assignee: XINSHIJIE REFRIGERATION INDUSTRY Co Ltd WUHAN
Current assignee: XINSHIJIE REFRIGERATION INDUSTRY Co Ltd WUHAN
Priority date: 2012-09-26
Filing date: 2012-09-26
Publication date: 2013-04-10
Anticipated expiration: 2022-09-26

Abstract

The utility model relates to a screw type helium compressor. The screw type helium compressor comprises a compressor body, wherein a gas suction end seat is arranged at the front end of the compressor body, a gas suction end cap is arranged on the gas suction end seat, and a gas exhaust end seat is arranged at the rear end of the compressor body; a pair of male rotor and female rotor which are placed in parallel and engaged with each other is arranged in a cavity which is formed by the compressor body, the gas suction end seat and the gas exhaust end seat together; and the gas suction end of the male rotor is provided with a balancing piston, four-point contact ball bearings are arranged at the gas exhaust ends of the male and female rotors, and a double-end-face shaft seal located at the outer side of the gas exhaust end of the four-point contact ball bearing is further arranged on the male rotor. According to the screw type helium compressor, helium can be effectively subjected to compression and pressurization, thereby avoiding helium leakage.

Description

The screw type helium compressor

Technical field

The utility model relates to gas compressing apparatus, refers to particularly a kind of screw type helium compressor.

Background technique

Helium is a kind of monatomic inert gas of at normal temperatures colorless and odorless, and content is few on earth, and it is rare to originate, and is therefore expensive.Because it has extremely low critical temperature, therefore have widely purposes in the cryogenic refrigeration field, the utmost point low temperature that is used for super conductor research in the scientific research is all realized by liquid helium usually.Helium will be liquefied, must compress supercharging to it being lower than under its critical transition temperature, this just must use compressor set and just can reach.

The working principle of screw compressor is that a pair of intermeshing rotor can form the between cog cavity volume that periodically change is large and dwindle when rotated in the space, thereby air, ammonia and freon refrigeration working medium are compressed.Because it is simple in structure that it has, component are few, do not have easily damaged parts, and reliability is high, convenient operating maintenance, the particular advantages such as dynamical balancing is good, freeze and the process gas compressor field in be applied.Yet, because helium has unique physics and chemistry character, be monoatomic gas, atomic weight is little, atomic diameter is little, this mean molecule diameter that just makes helium is much smaller than gases such as common ammonia or freon, and little molecular diameter directly causes especially easily seepage of helium, therefore uses general gas compressor to be difficult to satisfy its harsh usage requirement.

Summary of the invention

The purpose of this utility model is exactly that a kind of screw type helium compressor that can effectively compress supercharging to helium will be provided, and avoids the helium seepage.

For achieving the above object, the designed screw type helium compressor of the utility model comprises body, and the front end of described body is provided with suction end base, is provided with air-breathing end cap on the described suction end base, and the rear end of described body is provided with exhausting end base.Being provided with pair of parallel in the common cavity that forms of described body, suction end base and exhausting end base places and intermeshing male rotor and female rotor.The suction end of described male rotor is provided with equalizing piston.The exhaust end of described male rotor and female rotor is provided with four-point contact ball, and the exhaust end outside that is positioned at four-point contact ball on the described male rotor also is provided with the Double End shaft seal.

Further, described Double End shaft seal comprises the rotating ring axle sleeve that is fixedly installed on the male rotor, the outer ring of the described rotating ring axle sleeve rotating ring head that has been fixedly connected, and the left and right sides end face of described rotating ring head is provided with the stationary ring of snug fit.

Again further, the end face of described suction end base is provided with to be connected successively by A ~ I each point and surrounds the air-breathing aperture that forms, wherein: the circular arc line of AB section for matching with the female rotor cylindrical; The BC section is the circular arc line that matches with the male rotor cylindrical; CD section, DE section and EF section are the build-up curve close with the male rotor profile; The FG section is the root circle circular arc line of male rotor, and the HI section is female rotor root circle circular arc line; The GH section is the transition circle camber line between FG section and the HI section; The IA section is the radial alignment of female rotor.

Further, the end face of described exhausting end base is provided with to be connected successively by a ~ j each point and surrounds the vent ports that forms, wherein: the circular arc line of ab section for matching with the male rotor cylindrical; The bc section is the circular arc line close with the male rotor profile; The cd section is male rotor root circle circular arc line; De section, ef section and the fg section build-up curve for being consisted of by circular arc and straight line; The gh section is female rotor root circle circular arc line; The hi section is the circular arc line close with the female rotor profile; The ij section is the circular arc line that matches with the female rotor cylindrical

The utility model has the advantage of: designed screw type helium compressor axially forms the two seals end face along male rotor, with compressor inner chamber and isolated from atmosphere.During the compressor normal operation, in the formed intermediate cavity of two seals, pass into the lubricant oil that circulates, allow the pressure of oil a little more than the pressure of sealed compressor inner chamber, the lubricant oil that circulates like this can guarantee that the helium medium can not leak to ambient atmosphere, also can take away fricative heat, the cooling shaft seal.

The shape in air-breathing aperture can be so that cavity volume be connected air-breathing with air-breathing aperture when beginning to enlarge between rotor tooth, avoid producing air-breathing enclosed volume, and make the between cog cavity volume when being extended to maximum and air-breathing aperture breaks away from, finish breathing process, make between rotor tooth volume fully air-breathing, thereby guarantee that compressor has maximum displacement.The shape of vent ports can allow compressor operate in all the time under the most energy-conservation most economical state, avoids producing overcompression and under-voltage contracting phenomenon, avoids consuming extra power of motor.

Description of drawings

Fig. 1 is the plan view of the utility model screw type helium compressor.

Fig. 2 is the plan view of Fig. 1.

Fig. 3 is the left view of Fig. 1.

Fig. 4 is the structural representation of Double End shaft seal.

Fig. 5 is suction port mouth-shaped schematic representation.

Fig. 6 is vent ports shape schematic representation.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

As shown in Figure 1 to Figure 3, the screw type helium compressor comprises body 8, and the front end of body 8 is provided with suction end base 7, is provided with air-breathing end cap 6 on the described suction end base 7, and the rear end of described body 8 is provided with exhausting end base 9.Being provided with pair of parallel in body 8, suction end base 7 and the exhausting end base 9 common cavitys that form places and intermeshing male rotor 1 and female rotor 2.The intermeshing conjugation of the molded line of male rotor 1 and female rotor 2 is made spiral rotating around axis separately, forms spiral helicine teeth groove, with fixing velocity ratio uniform rotation, forms in the space and periodically becomes cavity volume large and that dwindle, and helium is compressed.The composition tooth curve of male rotor 1 and female rotor 2 molded line is circular arc line and arc envelope line, the Line of contact of engagement is short, stable drive, good airproof performance, efficient is high, and each forms between the tooth curve round and smooth without cusp, cleanliness is good, process easy to detectly, be convenient to the smooth and easy discharge of gas, the pneumatic noise when reducing exhaust.

The suction end of male rotor 1 is provided with equalizing piston 5, can bear male rotor 1 section axial active force.The two ends of male rotor 1 and female rotor 2 are designed with roller bearing 3, and male rotor 1 and female rotor 2 are done radial support and location, and bear male rotor 1 and the radial effect power of female rotor 2 when compressed helium gas.

Roller bearing 3 arranged outside of male rotor 1 and female rotor 2 have four-point contact ball 4, four-point contact ball 4 usefulness locking nuts are locked, connect as a whole with male rotor 1 or female rotor 2, male rotor 1 and female rotor 2 are made axially locating, and bear male rotor 1 and the axial force of female rotor 2 when compressed helium gas.The exhaust end outside that is positioned at four-point contact ball 4 on the male rotor 1 also is provided with Double End shaft seal 10, along the double-layer seal of the axial formation two seals end face of male rotor 1.Double End shaft seal 10 comprises the rotating ring axle sleeve 10a that is fixedly installed on the male rotor 1, the outer ring of the described rotating ring axle sleeve 10a rotating ring head 10b that has been fixedly connected, and the left and right sides end face of rotating ring head 10b is provided with the stationary ring 10c of snug fit, as shown in Figure 4.Also offer nozzle opening on the body 8, during the compressor normal operation, the lubricant oil that between twice axial seal end face, passes into certain pressure and circulate in the formed chamber, this pressure is a little more than the working pressure in the compressor chamber, and the helium in the compressor operating chamber can not pass through the sealing face leakage of shaft seal in ambient atmosphere.On the other hand, lubricant oil can be lubricated the work abrasive end face of Double End shaft seal 10 and cool off, the heat that produces when taking away the mutual friction of working surface phase.

The end face of suction end base 7 is provided with to be connected successively by A ~ I each point and surrounds the air-breathing aperture that forms, as shown in Figure 5.Wherein: the AB section is the circular arc line that matches with female rotor 2 cylindricals; The BC section is the circular arc line that matches with male rotor 1 cylindrical; CD section, DE section and EF section are the build-up curve close with male rotor 1 profile; The FG section is the root circle circular arc line of male rotor 1, and the HI section is female rotor 2 root circle circular arc lines; The GH section is the transition circle camber line between FG section and the HI section; The IA section is the radial alignment of female rotor 2.The shape in air-breathing aperture can guarantee that male rotor 1 and female rotor 2 between cog cavity volumes communicate air-breathing with air-breathing aperture when beginning to enlarge, avoid producing air-breathing enclosed volume, and make the between cog cavity volume when being extended to maximum and air-breathing aperture breaks away from, finish breathing process, make the between cog volume fully air-breathing, thereby guarantee that compressor has maximum displacement.

The end face of exhausting end base 9 is provided with to be connected successively by a ~ j each point and surrounds the vent ports that forms, as shown in Figure 6.Wherein: the ab section is the circular arc line that matches with male rotor 1 cylindrical; The bc section is the circular arc line close with male rotor 1 profile; The cd section is male rotor 1 root circle circular arc line; De section, ef section and the fg section build-up curve for being consisted of by circular arc and straight line; The gh section is female rotor 2 root circle circular arc lines; The hi section is the circular arc line close with female rotor 2 profiles; The ij section is the circular arc line that matches with female rotor 2 cylindricals.The shape of vent ports can make compressor operate in all the time under most economical, the energy-conservation state, avoids producing overcompression and under-voltage contracting phenomenon, avoids consuming extra power of motor.

Be provided with wire filter screen 11 in the air intake passage of body 8, can the helium that suck be filtered, get rid of the solid impurity thing, guarantee the compressor safe operation.

Claims

1. a screw type helium compressor comprises body (8), and the front end of described body (8) is provided with suction end base (7), is provided with air-breathing end cap (6) on the described suction end base (7), and the rear end of described body (8) is provided with exhausting end base (9); Be provided with pair of parallel in the common cavity that forms of described body (8), suction end base (7) and exhausting end base (9) and place and intermeshing male rotor (1) and female rotor (2), it is characterized in that: the suction end of described male rotor (1) is provided with equalizing piston (5); The exhaust end of described male rotor (1) and female rotor (2) is provided with four-point contact ball (4); The exhaust end outside that is positioned at four-point contact ball (4) on the described male rotor (1) also is provided with Double End shaft seal (10).

2. screw type helium compressor according to claim 1, it is characterized in that: described Double End shaft seal (10) comprises the rotating ring axle sleeve (10a) that is fixedly installed on the male rotor (1), the outer ring of described rotating ring axle sleeve (10a) the rotating ring head (10b) that has been fixedly connected, the left and right sides end face of described rotating ring head (10b) is provided with the stationary ring (10c) of snug fit.

3. screw type helium compressor according to claim 1 and 2, it is characterized in that: the end face of described suction end base (7) is provided with to be connected successively by A ~ I each point and surrounds the air-breathing aperture that forms, wherein: the circular arc line of AB section for matching with female rotor (2) cylindrical; The BC section is the circular arc line that matches with male rotor (1) cylindrical; CD section, DE section and EF section are the build-up curve close with male rotor (1) profile; The FG section is the root circle circular arc line of male rotor (1), and the HI section is female rotor (2) root circle circular arc line; The GH section is the transition circle camber line between FG section and the HI section; The IA section is the radial alignment of female rotor (2).

4. screw type helium compressor according to claim 1 and 2, it is characterized in that: the end face of described exhausting end base (9) is provided with to be connected successively by a ~ j each point and surrounds the vent ports that forms, wherein: the circular arc line of ab section for matching with male rotor (1) cylindrical; The bc section is the circular arc line close with male rotor (1) profile; The cd section is male rotor (1) root circle circular arc line; De section, ef section and the fg section build-up curve for being consisted of by circular arc and straight line; The gh section is female rotor (2) root circle circular arc line; The hi section is the circular arc line close with female rotor (2) profile; The ij section is the circular arc line that matches with female rotor (2) cylindrical.

5. screw type helium compressor according to claim 3, it is characterized in that: the end face of described exhausting end base (9) is provided with to be connected successively by a ~ j each point and surrounds the vent ports that forms, wherein: the circular arc line of ab section for matching with male rotor (1) cylindrical; The bc section is the circular arc line close with male rotor (1) profile; The cd section is male rotor (1) root circle circular arc line; De section, ef section and the fg section build-up curve for being consisted of by circular arc and straight line; The gh section is female rotor (2) root circle circular arc line; The hi section is the circular arc line close with female rotor (2) profile; The ij section is the circular arc line that matches with female rotor (2) cylindrical.