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Sprayer with tapered nozzle and tapered needle

A technology of injector and nozzle, applied in the field of power pump, can solve the problem of reducing the efficiency of the nozzle, and achieve the effect of improving the efficiency of the nozzle

Inactive Publication Date: 2004-09-08
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the nozzle efficiency of the conventional variable nozzle is reduced

Method used

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  • Sprayer with tapered nozzle and tapered needle
  • Sprayer with tapered nozzle and tapered needle
  • Sprayer with tapered nozzle and tapered needle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0042] will now refer to Figures 1 to 5A A first embodiment of the present invention is described. In the first embodiment, the ejector 40 of the present invention is generally typically used in an ejector cycle for a vehicle air conditioner. figure 1 The illustrated ejector cycle uses carbon dioxide as the refrigerant.

[0043] exist figure 1 In , the compressor 10 for compressing refrigerant is a variable displacement compressor. The compressor 10 is driven by a vehicle engine to draw and compress refrigerant. The amount of refrigerant from the compressor 10 is controlled so as to control the temperature and pressure in the evaporator 30 within predetermined ranges. Compressor 10 may be an electrically driven compressor. In this case, the refrigerant flow rate discharged from the compressor 10 may be controlled by controlling the rotation speed of the compressor 10 .

[0044] The radiator 20 is a high-pressure side heat exchanger. Heat exchange is performed between...

no. 2 example

[0078] will now refer to Figure 6 to Figure 8 A second embodiment of the present invention is described. Such as Figure 6 and Figure 7 As shown, in the second embodiment, the tip portion of the conical portion 44a is formed in a planar shape or a substantially hemispherical shape.

[0079] The tip of the conical portion 44a of the needle 44 is disposed in the jet A of the nozzle. Due to cavitation in the nozzle jet A, the tip of the conical portion 44a is easily corroded and the tip is easily deformed. Furthermore, it is difficult to manufacture a very thin tip portion of the conical portion 44a. Therefore, the manufacturing cost of the needle 44 may increase.

[0080] Instead, in Figure 6 and Figure 7 In the shown second embodiment, the thin tip portion of the conical portion 44a is removed so as to be formed into a planar shape or a substantially hemispherical shape, thereby improving the workability of the conical portion 44a. Therefore, deformation of the tip ...

no. 3 example

[0084] will now refer to Figure 9 A third embodiment of the present invention is described. Such as Figure 9 As shown, in the third embodiment, a straight portion 41e is formed in the nozzle 41 at the downstream end region. The cross-sectional area (radial inner dimension) of the straight portion 41e becomes substantially constant. Specifically, the straight portion 41e is formed between the nozzle outlet 41b and the throat portion 41d where the decrease in the cross-sectional area of ​​the fluid passage is greatest.

[0085] The nozzle outlet 41b is a portion of the tapered nozzle whose radially inner dimension is greatly reduced. However, in the case where the tapered nozzle portion 41c is manufactured by machining, if the total feed of the working machine is changed in the machining, the diameter of the nozzle outlet 41b is changed according to the total feed of the working machine. If the nozzle 1 is formed by casting, the casting nozzle 41 needs to be trimmed by add...

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PUM

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Abstract

In an ejector, a nozzle includes a nozzle tapered section having an inner passage with a radial dimension reduced toward a nozzle outlet port, and a needle having a needle tapered section disposed in the inner passage. The needle tapered section has a cross sectional area reduced toward a downstream end of the needle, and the downstream end of the needle is positioned at a downstream side with respect to the nozzle outlet port. In addition, the nozzle tapered section has a taper angle (phi1) which is equal to or greater than a taper angle (phi2) of the needle tapered section. Therefore, a boundary face on the outside of a nozzle jet flow becomes in a balanced natural shape, and is controlled in accordance with an operating condition. Thus, the ejector cycle can be operated while keeping high efficiency, regardless of the thermal load of the ejector cycle.

Description

technical field [0001] The present invention relates to an injector which is a dynamic pump for delivering fluid by entrainment using a high velocity jet of drive fluid. The ejector is configured with a tapered nozzle and a tapered needle, and is suitable for use in a vapor compression refrigerant cycle (ejector cycle) in which the ejector is used as a pumping unit for circulating refrigerant (for example, JIS Z 8126 2.2.2.3). Background technique [0002] Conventionally, Laval nozzles are used in injector cycles to increase the flow rate of fluid injected from the Laval nozzles. When the flow velocity of the fluid injected from the Laval nozzle is increased, the pumping effect of the injector is enhanced by the entrainment of the high velocity jet. Laval nozzles have a throat and a diffuser section downstream of the throat. The throat is the most reduced area of ​​fluid passage in a Laval nozzle. The diffuser portion has a passage cross-sectional area extending from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04F5/04F04F5/16F04F5/46F25B1/00F25B9/00F25B41/00
CPCF04F5/04F04F5/461F25B2600/17F25B41/00F25B2341/0013F25B2341/0012F25B2309/061F25B2500/01F25B9/008B60H2001/3298
Inventor 尾崎幸克堀田忠资武内裕嗣
Owner DENSO CORP