Axial flow impeller set of gas compressor

Abstract

The utility model discloses an axial flow impeller set of a gas compressor, which comprises a rotating shaft, the rotating shaft is connected to a rotating machine, a front bent impeller set and a rear bent impeller set are arranged on the rotating shaft, the front bent impeller set is composed of a plurality of front bent impellers, each front bent impeller comprises an impeller disc and a front bent blade, and the rear bent impeller set is composed of a plurality of rear bent impellers. The backward-bent impeller comprises an impeller disc and backward-bent blades, the forward-bent blades and the backward-bent blades are obliquely arranged on the impeller disc, and a plurality of guide blades are arranged between the forward-bent impeller set and the backward-bent impeller set; the front bent blade and the rear bent blade are combined, the front bent blade is close to the air inlet, enough air can enter the air compressor, the middle of the front bent blade is transited through the guide blade, then the air flow and pressure are improved through the rear bent blade, and the efficiency of the air compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressor impellers, in particular to an axial flow impeller group for a compressor. Background Art

[0002] At present, the power for the rotation of the compressor rotor of the engine is generally provided by a gas turbine. When the gas turbine provides the compressor rotor with rotational power, the rotational power is transmitted forward step by step from the last stage of the compressor rotor. Therefore, the rotor impellers of each stage in the multi-stage axial compressor are connected to each other to form an axial impeller group to realize the transmission of rotational power, so as to use the high-speed rotating blades to work on the air to increase the air pressure. The compressor impellers in the prior art are mostly bent at a single angle. The total pressure head generated by the forward curved blades is larger than that of the radial blades and the backward curved blades, but the dynamic pressure head accounts for a larger proportion of the total pressure head, the flow channel energy loss is large, and the efficiency is low; the total pressure head generated by the backward curved blades is smaller, but the static pressure head accounts for a larger proportion of the total pressure head, the flow channel energy loss is small, and the efficiency is high. The compressors using the two types of blades have their own advantages and disadvantages, so they need to be improved. Summary of the invention

[0003] The purpose of the utility model is to provide an axial flow impeller group for a compressor to solve the problems raised in the above background technology. To achieve the above purpose, the utility model provides the following technical solutions: an axial flow impeller group for a compressor, comprising a rotating shaft, the rotating shaft is connected to a rotating machine, a forward curved impeller group and a backward curved impeller group are arranged on the rotating shaft, the forward curved impeller group is composed of a plurality of forward curved impellers, the forward curved impellers include an impeller disk and forward curved blades, the backward curved impeller group is composed of a plurality of backward curved impellers, the backward curved impellers include an impeller disk and backward curved blades, the forward curved blades and the backward curved blades are both arranged obliquely on the impeller disk, and a plurality of guide vanes are arranged between the forward curved impeller group and the backward curved impeller group.

[0004] Preferably, the spacings between the forward curved impellers are equal, and the spacings between the backward curved impellers decrease in the direction of airflow.

[0005] Preferably, the guide vanes are arranged on the inner side of the compressor casing, and the cross-section of each guide vane along the length direction is S-shaped.

[0006] Preferably, the width of one end of the guide vane close to the forward curved impeller assembly is smaller than the width of the other end close to the backward curved impeller assembly.

[0007] Preferably, the impeller disc is fixedly mounted on the rotating shaft.

[0008] Preferably, the forward curved impeller assembly is close to the compressor air inlet.

[0009] Compared with the prior art, the beneficial effects of the utility model are: the utility model has a novel design, utilizes a reasonable mechanical structure, cleverly brings into play the inherent potential of various elements, combines forward curved blades with backward curved blades, and the forward curved blades are close to the air inlet to ensure that sufficient air volume enters the compressor. The guide blades are used for transition in the middle, and then the backward curved blades are used to increase the air flow and pressure, thereby improving the efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the forward curved impeller in the utility model;

[0012] Figure 3 This is a side view of the forward curved impeller in the utility model;

[0013] Figure 4 This is a schematic diagram of the structure of the backward curved impeller of the utility model;

[0014] Figure 5 This is a cross-sectional view of the guide blade in the utility model;

[0015] Figure 6 It is a schematic diagram of the structure of the guide blade in the utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1-4 The utility model provides a technical solution: a compressor axial flow impeller group, including a rotating shaft 1, the rotating shaft 1 is connected to a rotating machine 2, and the rotating shaft 1 is driven by the rotating machine 2 to rotate clockwise, and a forward curved impeller group 3 and a backward curved impeller group 4 are provided on the rotating shaft 1.

[0018] The forward curved impeller group 3 is composed of a plurality of forward curved impellers 31, and the forward curved impeller 31 includes an impeller disk 5 and a forward curved blade 32. The backward curved impeller group 4 is composed of a plurality of backward curved impellers 41, and the backward curved impeller 41 includes an impeller disk 5 and a backward curved blade 42. The forward curved blades 32 and the backward curved blades 42 are welded to the impeller disk 5.

[0019] The forward curved blades 32 and the backward curved blades 42 are both arranged obliquely on the impeller disk 5 with the same inclination angle, thereby forming a channel for gas to pass through.

[0020] The impeller disc 5 is fixedly mounted on the rotating shaft 1. As the rotating shaft 1 rotates clockwise, the impeller disc 5 also rotates clockwise synchronously. At this time, the airflow conveying direction passing through the forward curved impeller group 3 is consistent with the rotation direction of the impeller disc 5, and the total pressure head is large; the airflow conveying direction passing through the backward curved impeller group 4 is opposite to the rotation direction of the impeller disc 5, the flow channel energy loss is small, and the efficiency is high.

[0021] The forward curved impeller group 3 is close to the compressor air inlet, and the spacing between the forward curved impellers 31 is equal, which can ensure that sufficient air volume enters the compressor. The spacing between the backward curved impellers 41 decreases in the direction of air flow, thereby increasing the flow rate and pressure of the air flow and improving the working efficiency of the compressor.

[0022] See also Figure 5-6 A plurality of guide vanes 6 are provided between the forward curved impeller group 3 and the backward curved impeller group 4, and the airflow direction is transitioned by the guide vanes 6. The guide vanes 6 are provided on the inner side of the compressor casing 7, and the cross-section of each guide vane 6 along the length direction is S-shaped. The cross-sectional width of the guide vane 6 at one end close to the forward curved impeller group 3 is smaller than the cross-sectional width at the other end close to the backward curved impeller group 4, and the volume through which the airflow can pass is gradually reduced, thereby increasing the airflow velocity.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compressor axial flow impeller assembly, comprising a rotating shaft (1), wherein the rotating shaft (1) is connected to a rotor (2), characterized in that: The rotating shaft (1) is provided with a forward curved impeller group (3) and a backward curved impeller group (4); the forward curved impeller group (3) is composed of a plurality of forward curved impellers (31); the forward curved impellers (31) include an impeller disk (5) and forward curved blades (32); the backward curved impeller group (4) is composed of a plurality of backward curved impellers (41); the backward curved impellers (41) include an impeller disk (5) and backward curved blades (42); the forward curved blades (32) and the backward curved blades (42) are both arranged obliquely on the impeller disk (5); and a plurality of guide blades (6) are provided between the forward curved impeller group (3) and the backward curved impeller group (4).

2. The compressor axial flow impeller assembly according to claim 1, characterized in that: The spacings between the forward curved impellers (31) are equal, and the spacings between the backward curved impellers (41) decrease in the direction of the airflow.

3. The compressor axial flow impeller assembly according to claim 1, characterized in that: The guide vanes (6) are arranged on the inner side of the compressor casing (7), and the cross-section of each guide vane (6) along the length direction is S-shaped.

4. The compressor axial flow impeller assembly according to claim 3, characterized in that: The cross-sectional width of the guide blade (6) at one end close to the forward curved impeller assembly (3) is smaller than the cross-sectional width of the other end close to the backward curved impeller assembly (4).

5. The compressor axial flow impeller assembly according to claim 1, characterized in that: The impeller disc (5) is fixedly mounted on the rotating shaft (1).

6. The compressor axial flow impeller assembly according to claim 1, characterized in that: The forward curved impeller assembly (3) is close to the air inlet of the compressor.

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