Nozzle adjusting device of turboexpander

Abstract

The invention relates to an turboexpander and discloses a nozzle adjusting device of the turboexpander, which comprises a gear shaft (13), a toothed sector (11), a nozzle outlet ring (2), a rotatable control ring (5) concentrically embedded on the front end face of the nozzle outlet ring (2) and blades (3) circumferentially distributed on the front end face of the nozzle outlet ring (2) and the front end face of the control ring (5), wherein the head part of each blade (3) is provided with a chute (14) and the tail part of each blade (3) is provided with a circular hole (15); corresponding to each blade (3), the front end face of the nozzle outlet ring (2) is provided with a first shaft (4) running through the chute (14) and the front end face of the control ring (15) is provided with a second shaft (10) running through the circular hole (15); and the rear end face of the control ring (5) is provided with a pit for fixing the toothed sector (11), and the gear shaft (13) runs through the rear end face of the nozzle outlet ring (2) to be meshed with the toothed sector (11).

Description

technical field [0001] The invention relates to a turbo expander, in particular to a nozzle adjusting device for a turbo expander. Background technique [0002] Waste heat recovery technology has the advantages of low pollution, low cost, energy saving, etc., and has attracted widespread attention from the society in recent years. As the key working component in the waste heat recovery system, the turboexpander has been paid more and more attention by scientific research institutions. When recovering low-temperature waste heat, due to its low heat grade and unstable heat source supply, traditional turboexpanders with non-adjustable nozzle blades are difficult to meet the requirements of industrial applications. [0003] The turboexpander with adjustable nozzle vanes has the advantage of adjustable working conditions, and can better adapt to the requirements of variable working conditions in the waste heat recovery system, so it has been developed rapidly in recent years. T...

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Problems solved by technology

[0004] For example: U.S. Patent US4850795 adopts double rows of cascades and the cascades have different consistency, the inlet area is low consistency, and the exit area is high consistency. Due to the high consistency of the outlet cascades, this structure limits the expansion of the working area and cannot fully adapt to waste heat. Recover the needs of changing working conditions; US Patent US3756739 adopts a small blade at the end of the long blade to control the adjustment of working conditions, the adjustment range is relatively narrow and the control structure is relatively complicated; US Patent US4499732 adopts the adjustment form of variable blade height, The structure of this type is complex. When the working conditions are changed, only the height of the blades in the flow channel is changed, but the installation angle of the blades does not change. Therefore, the performance is limited compared with non-adjustable blades. At the same time, the adjustment form of variable blade heights also has large impact losses, Shortcomings such as low efficiency; Chinese patent 00204860.4 proposes a diffuser with rotating inner and outer rings, which divides the diffuser blades into two and respectively locates on two rings that can rotate relative to each other. The structure is simple, but because the rotating ring The staggering of the upper blades changes the structure of the flow channel, which will cause a large flow loss, and it is difficult to ensure the corresponding positional relationship under different working conditions, and the flow cannot be actively adjusted

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