1. Origin of technology. As early as 15 years ago at the Purdue Conference, Japan's Toshiba Company proposed a new type of compression - the helical vane compressor, briefly expounding its working principle and working characteristics, and published The measured results (documents) of pressure changes in the working process were translated into Chinese and introduced to China. This new type of compressor has excellent thermal, dynamic and mechanical properties, and is especially suitable for refrigeration and air conditioning. Toshiba's actual measurement results show that its performance indicators are superior to rolling rotor compressors. In the following 15 years, no research literature and physical reports in this area have been found. During this period, Xi'an Jiaotong University and many foreign researchers also engaged in this research, but no one can turn this theory into a product and enter the market so far.

  2. technical difficulty. The difficulty of the new helical vane compressor lies in the difficulty of processing and assembly, and the high process requirements. According to the original design process, it is impossible to assemble and form. The key components of the originally designed helical vane compressor are the vanes and the rotor shaft, which are the key difficulties in processing and assembly. The machining and assembly accuracy of the groove and the groove are very high, and the hardness of the blade is also high, which is also a solution that is not easy to achieve. The inner diameter of the spiral blade is smaller than the outer diameter of the spiral channel shaft, so it cannot be installed at all, and it is difficult to form a product.

The above technical problems, the National Machinery Industry Press once put forward this unsolved problem in the general higher education mechanical and electrical planning textbooks in February 2001, and was identified as the "Ninth Five-Year" national key textbooks published in the city (China). Version Library CIP Data Core Word (2001) No. 01991).

3. Working principle and structure overview

(1) Overall performance. Helical vane compressor, after transformation, it is a kind of high efficiency, low noise, low vibration, excellent balance, no suction overheating, no exhaust overheating, soft start, low energy consumption, resistance torque change of shaft power A new type of refrigeration compressor that is uniform, has no intake valve, no exhaust valve, and can directly compress liquid and wet vapor. It is a new type of refrigeration compressor with small volume, few spare parts, cylindrical cylinder, helical piston with helical groove and variable pitch helical blade, and rotary type, which can be applied to various refrigerants (environmental protection medium) .

(2) Structural properties. The outer diameter of the screw piston is smaller than the inner diameter of the cylinder. It is installed eccentrically with the cylinder. The eccentricity should ensure that the outer surface of the rotating piston is tangent to the inner wall of the cylinder at the bottom. A crescent-shaped space is formed between. The outer diameter of the variable pitch helical blade made of elastic material is equal to the inner diameter of the cylinder, and the variation rule of the blade pitch is consistent with the variation rule of the pitch of the helical groove on the piston. Therefore, the crescent-shaped space is divided into several closed helical crescent spaces, which is the working cavity of the helical vane compressor, also known as the primitive volume.

(3) Working principle. The pitch of the helical blade gradually decreases from the suction side to the exhaust side, so the volume of the working chamber also gradually decreases accordingly. When the rotary piston rotates, the helical blade rotates around the center line of the cylinder under its drive, and moves radially in the helical groove of the piston. Therefore, the gas sucked in from the suction side is pushed to the exhaust side under the action of the helical blades. Because the volume of the working cavity gradually decreases, the gas in the cavity is compressed, and its pressure gradually increases. After reaching a certain pressure It is discharged from the exhaust port to complete the entire working process of the compressor.

(4) Main features. Helical vane compressors have many advantages compared with return, rolling rotor, scroll and eccentric shaft compressors.

◆High efficiency, the high efficiency of the helical vane compressor has many aspects, the pressure formation process curve of the helical vane compressor can be clearly seen, the pressure angle of the helical vane compressor changes slowly, that is, the working chamber It takes several revolutions of the piston to complete a gas compression process, so that the gas pressure difference between adjacent working chambers can be very small, so that the leakage between adjacent working chambers is very small. And because there is no end face gap, there is no leakage of the end face gap, so the leakage loss is very small.

◆There is no intake valve and exhaust valve, and the intake and exhaust ports are arranged axially and in the same direction as the airflow, so the flow resistance is small. There is no pulsation phenomenon, no suction overheating and exhaust overheating, reducing heating loss. The intake port and the exhaust port are respectively arranged on both sides of the cylinder.

◆The connection between the compressor and the electric motor is a soft connection of positive and negative permanent magnet steel using magnetic flux, which reduces the problem of large instantaneous current when the motor starts, and also solves the problem of damage to the motor in case of internal failure of the compressor.

◆The helical vane compressor adopts 220V single-phase current and brushless variable frequency motor, which has the remarkable feature of low noise (below 40 decibels).

◆Low vibration and low noise. Because the rotary piston of the cylinder and the helical blade rotate around its own center line, the friction area is small, so there is no unbalanced rotation, and the inertial force and dynamic balance performance are good. Smooth operation, so the compressor has almost no vibration, and because there is no intake and exhaust valve, the airflow direction is good, so the noise is also low.

◆The resistance torque of the helical vane compressor changes evenly. Because the gas pressure difference between the adjacent working chambers of the helical vane compressor is very small, and the increase in pressure per unit speed can be controlled by optimizing the pitch and the number of helical turns, the resistance torque change curve of the helical vane compressor is compared. It is flat, and its peak value is only 1/3 of the scroll compressor, while the peak value of the resistance torque of the rolling rotor compressor cannot be compared with the helical vane compressor.

In the past 20 years, refrigeration and cryogenic technologies have been rapidly developed and widely used. From people's daily life to various sectors of the national economy, from traditional industries to high-tech industries, from defense technology to aerospace, refrigeration, cryogenic technology and refrigeration equipment are inseparable everywhere.