Improving the mechanical efficiency and working life of the compressor is very unfavorable

At present, a large number of room air conditioners use rolling piston compressors. The advantages of this type of compressor are that the structure is relatively simple, the volumetric efficiency is high, and the system of cooling capacity is easy to implement, so the market competitiveness is high. However, the rolling piston compressor has structural defects, for example, its rolling piston and rotor work in an eccentric rotation manner, so there is a relatively large unbalanced centrifugal inertia force, so it is necessary to design a special balancing block; At the same time, there is a high relative movement speed between the various motion pairs of the compressor, in particular, the isolation blade is slid at high speed against the outer surface of the rolling piston, thereby causing large friction and wear; The seal between the inner end of the isolating vane and the outer surface of the rolling piston adopts a line contact sealing structure, and there is a mating interval between the side end of the isolating vane and the end caps on both sides, so inevitably, a large internal leakage loss is generated. .

Aiming at the shortcomings of rolling piston compressors, relevant scientific and technical personnel have carried out a lot of research and proposed many new refrigeration compressors with practical prospects, such as spiral vane compressors, articulated vane compressors, etc. A rotary compressor is also one of this type of compressor. Design Ideas The embedded vane rotary compressor discussed in this paper has an embedded isolation blade, a rotating cylinder sleeve, a rotating column and two follower end caps. Its working principle and mechanism analysis. The main discussion of this type of compressor is here. Some design ideas and principles. The arrangement of the main shaft of the vertical structure compressor is not only related to the space occupied by the compressor, but also affects the layout of the major systems of the compressor, especially the lubrication system. In general, room air conditioner compressors are less restricted in the height direction, so the main shaft design of the compressor is mainly vertical, in which case the lubrication system of the compressor is the simplest. For the same reason, the embedded vane compressor also uses a vertical spindle structure.

The high back pressure cylinder fluid machine adopts a high back pressure cylinder cavity structure or a low back pressure cylinder cavity structure, which has a significant influence on the compressor motor design and has a large influence on the volumetric efficiency of the compressor. If the high back pressure cylinder cavity scheme is adopted, the cooling of the motor can only be completed by the high temperature and high pressure exhaust gas. Due to the poor cooling effect, the working efficiency and the working reliability of the motor are reduced, so the design of the motor is made. In particular, stringent requirements are imposed on the insulation design of the motor. However, from another point of view, the high back pressure cylinder structure has less harmful heating to the compressor intake, so the volumetric efficiency of the compressor is expected to increase, and the design of the compressor lubrication system can be greatly simplified. At present, developed countries such as Japan tend to adopt a high back pressure cylinder structure, which is a reflection of the motor design progress.

In view of this, the compressor adopts a high back pressure cylinder cavity scheme. The lower-mounted motor adopts a vertical structure compressor, and the motor is arranged in an upper type and a lower type. In essence, the difference between the two is small. However, in the case of the embedded vane type compressor, the solution of the lower-mounted motor is better to handle the main body support structure of the compressor, and in particular, the assembly, adjustment and detection of the compressor are very convenient, so the lower-mounted motor is used.

The rotor adopts a rotating cylinder sleeve as the active member. Usually, the rotor of the compressor is fastened and connected to the rotor of the motor as an active member. However, the structure of the embedded vane rotary compressor is special. If the rotor is used as an active member, The path of power transmission is: the rotor rotates the rotating column through the circular arc groove on the rotor, and then the isolation blade rotates through the flat sliding groove on the rotating column, and finally the rotating blade sleeve and the following end cover rotate together by the isolating blade. Obviously, the load on the rotating column is very serious in this background, especially the force and reaction force between the rotating column chute and the isolating blade is very large, which is very unfavorable for improving the mechanical efficiency and working life of the compressor. On the contrary, if the rotary cylinder is used as the active member and the rotor is changed into the follower, the above problem can be solved easily. At this time, the force characteristics of the isolation blade and the rotating column are optimal: the isolation blade moves the rotary column through the sliding groove, and then The rotating column drives the rotor to rotate. The main force that needs to be overcome when the rotor is turned over is the viscous drag torque of the bearing, so the interaction force between the separating blade and the rotating column is small. Therefore, the author believes that the embedded vane rotary compressor should use the rotating cylinder sleeve as the active part, which is also a special feature of the compressor.

The structural design is based on the above design ideas. The author designed a rotary compressor with a vane-type room air conditioner. The following is a preliminary analysis of its structure. The embedded vane rotary compressor adopts a vertical spindle, a lower motor and a high back pressure cylinder structure. A follower end cover is fastened and connected at each end of the rotary cylinder sleeve, wherein the central part of the lower end cover is formed as a rotating shaft structure and supported on an inner ring of a cylindrical rolling bearing without a rib on the inner ring; the rotating shaft and the motor rotor Tightly fitting, the lower end is connected to an oil suction pipe, and the middle of the rotating shaft is provided with an axial inlet passage and a lubricating oil passage; the lower end cover is provided with a radial inlet passage for axially inlet of the rotating shaft and the suction chamber of the compressor The upper end cover is fastened to the rotating shaft (lower end cover) by screws, and the exhaust valve cavity is arranged thereon, and a cylindrical reed exhaust valve is installed; the two ends of the blade are respectively embedded on the upper and lower sides. The movable end cover has an outer end embedded on the inner wall of the rotary cylinder sleeve, and an inner end thereof is slidably fitted with the rotary column flat groove; the bracket is closely matched with the cylinder casing, and the radial air passage and the intake pipe phase are arranged thereon Connected, and has an annular air passage to communicate with the shaft air passage; the rotor adopts a cantilever structure, the upper end is supported by a double sliding bearing, and is connected with the above bracket through a bearing, a bearing frame and a cylinder through a sliding bearing; The lower end is provided with a pressure balance chamber, utilizing and exhausting

Structural Features The structural features of the embedded vane compressor are: the outer end and the side end of the isolating vane are respectively embedded on the rotating cylinder sleeve and the follower end cap, thereby completely blocking their leakage path at these contacts. Therefore, it can effectively reduce the internal leakage loss of the compressor. At the same time, the embedded structure does not have relative motion, so the friction loss at the outer end and the side end of the isolation blade is completely solved.

Another feature of the embedded vane compressor is that the compressor shaft, rotor, rotary cylinder sleeve and follow-up end cover are all rotated in a fixed axis. Since there is no large eccentric motion quality, the compressor does not need to be provided with a special balance block. In addition, since the rotation direction is the same, the relative movement speed between the rotor and the rotary cylinder sleeve, between the rotor and the two side follower end covers, and between the separation vane and the rotary column chute is small, so the friction loss is also small.

In terms of intake and exhaust: although the intake path of the embedded vane compressor appears to be more roundabout, the radial air passage on the rotating shaft can act as a centrifugal pressurization, which can partially compensate for the compressor intake process. Loss along the path and local loss; In addition, the exhaust valve of the compressor adopts a cylindrical structure, which has better fatigue resistance, but the shape of the valve cavity is slightly complicated.

From the perspective of manufacturing process, the main components of the embedded blade compressor have the following characteristics: (1) The shape of the rotating shaft is the most complicated, and the processing steps are numerous.

Compared with the rotating shaft of the rolling piston compressor, the rotating shaft does not have the structure of the eccentric journal, so the machining accuracy is easily ensured. Paying attention to its shape characteristics and stress conditions, the rotating shaft can be considered to use ductile iron (2). Because there is a flat chute in the rotating column, the machining process is not good, but the force between the chute and the isolating blade is far. It is smaller than the force between the chute and the blade in the rolling piston compressor, so its requirements can be lower and can be made by powder metallurgy.

(3) The isolation blade has only the thickness dimension and the combination of the rotary column chute. Compared with the blade of the rolling piston compressor, the dimensional tolerances and geometrical tolerances of the three sides of the two sides are not required. In particular, it does not have a circular arc surface in contact with the rotor, so its processing is easy to ensure.

(4) The rotary cylinder sleeve is made of high-quality gray cast iron HT250. The between the two ends and the side end cover, and the outer round surface are tightly connected with the rotating shaft and the follow-up end cover, because there is no relative movement. With the cooperation problem, the requirements of machining process and installation matching can be greatly relaxed. The rotor of the compressor adopts a cantilever support structure. On the one hand, a double sliding bearing support is adopted for reinforcing the rigidity, and as a result, the height of the compressor is increased, and at the same time, the structure of the compressor is not sufficiently compact due to the increase of the bearing housing and the bearing frame. On the other hand, the cooperation between the rotor and the rotary cylinder can be fine-tuned by adjustment between the bearing housing and the bearing frame, in other words, the requirements for the compressor manufacturing and assembly process can be appropriately relaxed.

The embedded vane rotary compressor proposed in this paper breaks through the traditional structure of the conventional refrigeration compressor by using the embedded isolation vane and the technology of fixed shaft rotation. Research shows that the sealing and anti-friction structure is feasible, the eccentric motion quality is small, the processing technology and assembly process are simple, although it is not compact enough in structure, the processability of some parts remains to be Improvements, but overall its advantages are obvious, and its emergence enriches the variety of existing room air conditioner compressors.

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