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CN-115234523-B - Injector with variable nozzle structure

CN115234523BCN 115234523 BCN115234523 BCN 115234523BCN-115234523-B

Abstract

The ejector has a variable nozzle structure and is installed in the fuel cell recirculation line to supply new hydrogen and recirculation gas. The injector includes a first housing having a first hole through which hydrogen is supplied and an orifice through which the hydrogen is discharged, a second housing disposed in the first housing and having a second hole into which the hydrogen passing through the first hole flows, and a poppet valve passing through a third hole defined at one side of the second housing. The poppet valve is configured to adjust an area of a space opened by an orifice through which hydrogen gas is discharged. The hydrogen gas flowing into the second housing is discharged through the space between the poppet valve and the other side of the second housing opposite to the one side to move to the orifice.

Inventors

  • Shen Xiaoxie
  • Pu Rentai

Assignees

  • 现代自动车株式会社
  • 现代自动车株式会社
  • 起亚株式会社
  • 起亚株式会社

Dates

Publication Date
20260421
Application Date
20211117
Priority Date
20210422

Claims (12)

  1. 1. An injector having a variable nozzle structure, the injector being installed in a fuel cell recirculation line to supply new hydrogen and recirculated gas, the injector comprising: A first housing having a first hole through which hydrogen is supplied and an orifice through which hydrogen is discharged; a second housing provided in the first housing, the second housing having a second hole into which hydrogen gas passing through the first hole flows, and A poppet valve disposed in the second housing and passing through a third hole defined at one side of the second housing, and configured to adjust an area of a space opened by the orifice for discharging hydrogen gas, Wherein the hydrogen gas flowing into the second housing moves to the other side of the second housing opposite to the one side along the space between the second housing and the poppet valve, is discharged out of the second housing through the space between the opened other side of the second housing and the poppet valve, and then moves to the one side of the second housing along the space between the first housing and the second housing, and then moves to the orifice.
  2. 2. The injector according to claim 1, Wherein the poppet valve includes a first region passing through the third hole and a second region adjacent to the other side of the second housing, and Wherein hydrogen is discharged through a space between the second region and the second housing.
  3. 3. The injector of claim 2, further comprising a damage preventing member provided on a surface of the second region of the poppet valve to contact the second housing, Wherein the damage preventing member is in contact with or separated from the second housing according to a pressure applied to the poppet valve by hydrogen gas flowing into the second housing.
  4. 4. An injector according to claim 3, Wherein as the pressure applied to the poppet increases, the poppet moves in a direction away from the orifice, and Wherein a distance between the second region and the second housing increases as the poppet moves in a direction away from the aperture.
  5. 5. The injector according to claim 2, Wherein the first region of the poppet valve extends in a direction from the second region toward the orifice.
  6. 6. The injector according to claim 5, Wherein the cross-sectional area of the second region increases as the second region moves away from the point of connection to the first region.
  7. 7. The injector according to claim 1, Wherein a protrusion protruding toward the poppet valve is provided on an inner surface of the second housing, and Wherein a spring is disposed between the protrusion and the third hole.
  8. 8. The injector of claim 7, further comprising: a guide member provided on a surface of the poppet to guide a position of the poppet in the second housing, Wherein the guide member is disposed between the spring and the third hole.
  9. 9. The injector according to claim 1, Wherein a plurality of first holes and a plurality of second holes are defined, an Wherein a flow path connecting the first hole and the second hole is provided.
  10. 10. The injector according to claim 9, Wherein the first hole and the second hole are defined to overlap in a direction perpendicular to a direction in which the poppet valve extends, such that hydrogen gas passing through the first hole flows into the second hole.
  11. 11. The injector according to claim 1, Wherein an airtight member is provided between the third hole and the poppet valve.
  12. 12. The injector according to claim 1, Wherein the first housing is inserted into a fourth hole defined in a third housing to which hydrogen gas is supplied.

Description

Injector with variable nozzle structure Technical Field The present invention relates to an injector having a variable nozzle structure capable of varying the flow rate of hydrogen gas discharged by the injector according to the flow rate of hydrogen gas supplied to the injector. Background The hydrogen supply system is a system configured to receive high-pressure hydrogen from a hydrogen tank and reduce the pressure of the hydrogen to a pressure required for the fuel cell stack to supply the hydrogen. The main functions of the hydrogen supply system are to sufficiently supply hydrogen required for the fuel cell stack, circulate unreacted hydrogen, and remove impurities inside the fuel cell stack to improve the purity of hydrogen. In order to generate the maximum output required by the fuel cell stack, the hydrogen supply system should supply an amount of hydrogen equal to or greater than that corresponding to the maximum output. In order to recycle the unreacted gas, the hydrogen supply system should recycle the unreacted gas using a recycling part such as a blower or an ejector. A blower may be used as a means of recycling the hydrogen. The blower is a motor-based component and requires an actuator. The actuators are expensive and the bearings or other components are highly likely to be corroded by the condensate water of the recirculated gas. In the case where an ejector is used instead of a blower, the technique can be simplified to achieve recycling of hydrogen. In order to ensure the recirculation performance of the low output section and to ensure the maximum supply performance of the high output section, a method of increasing the pressure at the front end of the ejector or a method of using two ejectors is used. However, the method of increasing the pressure at the hydrogen supply end makes it difficult to ensure the air tightness of the hydrogen supply end and to maintain the internal pressure performance. Furthermore, the method using two ejectors has disadvantages in terms of overall packaging due to the increased size of the hydrogen supply system. The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art in this country. Disclosure of Invention An object of the present invention is to provide an injector having a variable nozzle structure capable of changing the flow rate of hydrogen discharged from the injector according to the flow rate of hydrogen supplied to the injector. In an ejector with a variable nozzle structure installed in a fuel cell recirculation line according to an embodiment of the present invention to supply new hydrogen gas and recirculation gas. The injector having the variable nozzle structure includes a first housing in which hydrogen gas is supplied through a first hole and the hydrogen gas is discharged through an orifice, a second housing disposed in the first housing and having a second hole into which the hydrogen gas passing through the first hole flows, and a poppet valve passing through a third hole defined at one side (i.e., a first side) of the second housing. The poppet valve is configured to adjust an area of an opening of an orifice through which hydrogen is discharged. The hydrogen gas flowing into the second housing is discharged through the space between the poppet valve and the other side (i.e., the second side) of the second housing opposite to the first side to move to the orifice. As an example, the poppet valve includes a first region passing through the third aperture and a second region adjacent to the second side of the second housing. The hydrogen gas is discharged through the space between the second region and the second housing. As an example, an injector having a variable nozzle structure includes a damage preventing member disposed on a surface of a second region of a poppet valve to contact a second housing. The damage preventing member is brought into contact with or separated from the second housing according to the pressure applied to the poppet valve by the hydrogen gas flowing into the second housing. As an example, as the pressure applied to the poppet increases, the poppet moves in a direction away from the orifice. As the poppet valve moves in a direction away from the orifice, the distance between the second region and the second housing increases. As an example, the first region of the poppet valve extends in a direction from the second region toward the orifice. As an example, the cross-sectional area of the second region increases as the second region moves away from the point of connection to the first region. As an example, a protrusion protruding toward the poppet valve is provided on the inner surface of the second housing, and a spring is provided between the protrusion and the third hole. As an example, the injecto