CN205578298U - Interstage centrifugal compressor that bleeds - Google Patents

Abstract

An interstage suction centrifugal compressor, which mainly includes: main shaft, impeller, spacer, thrust disc, balance disc, diaphragm coupling, diffuser, reflux device, bend, inlet and outlet volute, seal , bearing group components, housing, etc., characterized in that: (1) the housing of the compressor is divided into upper and lower bodies from the horizontal plane of the rotating shaft, and the two are connected and fixed by the sealing bodies at both ends of the compressor; (2) the impeller , spacer, balance plate, thrust plate and other parts are installed on the main shaft to form the rotor of the compressor, and the rotor is installed on the lower shell through bearings and bearing seats; (3) The bottom of the lower shell of the compressor is fixed on the support, and its Air inlets and outlets are arranged at the front and rear of the bottom, and an air outlet for air extraction is arranged in the middle. There are two types of impellers, big and small, the big impeller before the exhaust air outlet, and the small impeller after the air outlet. The impeller is a closed impeller welded with ASTM 705A stainless steel, and the blade adopts a backward curved structure.

Description

A kind of interstage suction centrifugal compressor

technical field

The utility model belongs to the technical field of compressors, and in particular relates to an inter-stage air-absorbing centrifugal compressor in the technical field of chemical engineering to meet multiple process requirements of users.

Background technique

As a pneumatic machine, centrifugal compressors are widely used in petrochemical industry, metallurgical industry and other industrial technology fields. When designing centrifugal compressors, many factors must be considered, such as reducing production costs and improving compressor working efficiency.

At present, the centrifugal compressors used by most petrochemical enterprises include horizontally split compressors, cylindrical compressors (that is, vertically split), axial flow compressors, etc. The gases delivered by these types of compressors are Enter the compressor from the inlet at one end, output from the outlet at the other end after being pressurized by the rotor, and enter the user's process pipeline. Even if there are two-stage or three-stage compressors, the gas temperature is too high, so that The gas passes through the cooler to achieve cooling, and then returns to the compressor to increase the pressure.

How to effectively improve the efficiency of the compressor, prolong the service life, reduce the maintenance cost, and provide an efficient and reliable compressor has become the goal pursued by scientists and technicians in this technical field.

Chinese patent CN1015489B discloses a "multi-stage centrifugal compressor", which is characterized in that: each impeller of the compressor and the diffuser connected to it form a first stage, and the compressor has at least four centrifugal rotors and at least four guides. Vane diffuser (i.e. vane diffuser). In the guide vane diffuser mentioned above, the ratio of the guide vane leading edge radius of the former diffuser to the rotor outlet radius is greater than the same ratio of the latter diffuser, and the latter diffuser is farther from the discharge side than the stated The previous diffuser is near. In addition to the stages described with vane-type diffusers, there is at least one stage of vaneless diffusers. Since the rotary desulfurization in the diffuser is generated when the backflow develops and forms a backflow zone that rotates in the diffuser, and the guide vane diffuser is installed inside the position where the backflow begins to appear in the vaneless diffuser. The leading edge of the vane has the function of preventing backflow. In this way, the initial backflow in the reflux device is suppressed, and the occurrence of rotary desulfurization is avoided, so that the compressor can achieve high efficiency and can operate in a wide range. work in the range.

Chinese invention patent application CN102434491A discloses a "centrifugal compressor". The guide vanes of the vane diffuser are composed of long and short guide vanes with the same trailing edge radius but different lengths. At least one short guide vane is arranged between them, and the rectification effect of the short guide vane is used to improve the performance of the compressor.

Though the products of above-mentioned all inventions have been applied in industrial production, some aspects of its products have room for improvement, and there is no great innovation in technology. We imagine that if the gas compressed by one compressor can supply multiple process pipelines, this will bring greater benefits to users. Through the research on the main parts of the product, namely the rotor and the working wheel on the rotor (ie impeller), as well as the sealing device of the compressor, the shape of the casing and many other parts, we believe that the working efficiency of the compressor can be improved and the cost saved The maintenance cost and even the scope of its work will be greatly expanded, which is the focus of our research work.

Utility model content

Aiming at the deficiencies in the existing technology, the utility model provides a centrifugal compressor used in the petrochemical industry for pumping air between intermediate stages, that is, after the gas entering the compressor inlet is compressed, its gas pressure reaches the user's desired value. The required pressure, so that the compressed gas can be pumped out through the exhaust fan to be used on the process pipeline, and the remaining compressed gas will continue to be compressed and used on other process pipelines to improve the efficiency of the compressor.

The utility model provides an interstage suction centrifugal compressor, which mainly includes: a main shaft, an impeller, a spacer, a thrust disc, a balance disc, a diaphragm coupling, a diffuser, a reflux device, a bend, an inlet Outlet volute, seal, bearing group parts, housing, etc., are characterized in that:

(1) The shell of the compressor is divided into upper and lower parts from the horizontal plane of the rotating shaft, and the two are connected and fixed by the sealing bodies at both ends of the compressor;

(2) The impeller, spacer, balance disc, thrust disc and other parts are installed on the main shaft to form the rotor of the compressor, and the rotor is installed on the lower casing through bearings and bearing seats;

(3) The lower part of the lower casing of the compressor is fixed on the support, and the air inlet and outlet are arranged at the front and rear of the lower part, and an air outlet for air extraction is arranged in the middle.

The size of the impeller on the rotor of the centrifugal compressor of the utility model is two types, the big impeller before the exhaust air cylinder ensures the suction pressure, and the small impeller after that can further compress the gas. This design will improve the performance of the product. work efficiency and use efficiency;

The impeller of the centrifugal compressor of the utility model adopts the closed impeller of ASTM 705A stainless steel, which is formed by welding process, and the blade adopts the blade form of the backward curved structure. Compared with the open impeller of other products, the overall efficiency of the unit is greatly improved. improvement.

The centrifugal compressor of the utility model is a product designed through continuous practice and research on the basis of the previous ones. Careful research and improvement have been done on all aspects of the unit, so that the working efficiency and service life of this product are improved. There has been a great improvement. The interstage air-absorbing centrifugal compressor of the present utility model receives unanimous praise from users and is welcomed by users in the process of using it.

Description of drawings

Fig. 1 is a main sectional view of the interstage air-absorbing centrifugal compressor of the present invention, and Fig. 2 is an outline view of the inter-stage air-absorbing centrifugal compressor.

detailed description

The interstage suction centrifugal compressor of the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the main sectional view of the utility model interstage air-filled centrifugal compressor, as shown in the figure. The interstage suction centrifugal compressor includes an upper casing 1, a lower casing 2, an air inlet cylinder 3, an exhaust cylinder 4, an air outlet cylinder 5, a main shaft 6, an impeller 7, a sealing assembly 8, a partition 9, and a bearing assembly component 10 , Coupling 11. Parts such as impeller 7 and spacer, balance disc, thrust disc are installed on the main shaft to form the rotor, and coupling 11 is installed on one end of the rotor so as to be connected with the driving machine.

Figure 2 is an outline view of an interstage suction centrifugal compressor. It includes an upper casing 2, a lower casing 3, and bolts 12. The partitions 9 are respectively installed on the upper casing 1 and the lower casing 2, and the bearing assembly component 10 is placed on the sealing body of the lower casing 2, and the rotor Put it on the bearing, and reconcile the upper casing and the lower casing with 12 bolts to complete the installation of the complete machine.

The impeller of the utility model interstage aerated centrifugal compressor adopts a closed impeller in the form of backward bending, and the material is ASTM 705A stainless steel. The blade is processed by milling and is integrated with the lower wheel disc. The disc is welded. The product of the utility model adopts a closed impeller, and its working efficiency is much higher than that of a semi-open impeller. At the same time, it can better meet the requirements of the petrochemical industry and bring greater benefits to users.

The utility model provides an interstage air extraction structure for the interstage air extraction centrifugal compressor, and an air extraction air duct is provided at the bend of at least two stages of centrifugal compressors, so that it can be used for multiple process pipelines, thereby meeting the needs of users. kind of demand.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and variations. All modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims (3)

1. An interstage suction centrifugal compressor, which mainly includes: main shaft, impeller, spacer, thrust disc, balance disc, diaphragm coupling, diffuser, reflux device, bend, inlet and outlet volute , a seal, a bearing set component, and a housing, characterized in that: (1) The shell of the compressor is divided into upper and lower parts from the horizontal plane of the rotating shaft, and the two are connected and fixed by the sealing bodies at both ends of the compressor; (2) The impeller, spacer, balance disc, and thrust disc are installed on the main shaft to form the rotor of the compressor, and the rotor is installed on the lower casing through bearings and bearing seats; (3) The lower part of the lower casing of the compressor is fixed on the support, and the air inlet and outlet are arranged at the front and rear of the lower part, and an air outlet for air extraction is arranged in the middle. 2. The interstage suction centrifugal compressor according to claim 1, characterized in that said impellers are divided into two types, big and small, the big impeller before the air outlet, and the small impeller after the air outlet. 3. The interstage suction centrifugal compressor according to claim 1 or 2, characterized in that the closed impeller is welded with ASTM 705A stainless steel, and the blade adopts a backward curved structure.