Nozzle assembly for vehicle

Abstract

A nozzle assembly for a vehicle includes a first nozzle portion providing a fluid passage in which a fluid flows and a second nozzle portion surrounding the first nozzle portion, the second nozzle portion extending in a direction of flow of the fluid when an imaginary straight line passing through the fluid passage and extending in a direction of flow of the fluid is defined as a reference straight line. The first nozzle portion includes a spacer region having a shape recessed in a direction facing the reference straight line to be spaced apart from a portion of the second nozzle portion. The nozzle assembly may be secured to a body of a vehicle as part of an injector for injecting a fluid having pressure to a target location, such as a hydrogen fuel cell of the vehicle.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2023-0114008 filed on August 29, 2023, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to a nozzle assembly and, more particularly, to a nozzle assembly that may form part of an injector for injecting a pressurized fluid into a target location, such as a hydrogen fuel cell for powering a vehicle. Background Art

[0004] The nozzle may have a spray hole through which a fluid may be sprayed. The nozzle may be used to spray a fluid (e.g., hydrogen) having a high fluid velocity into a target space. For example, the nozzle may include a nozzle assembly, and since the cross-section of the fluid passage changes when the fluid pressure of the fluid changes, the nozzle assembly may spray a fluid having different fluid velocities according to the changing fluid pressure. The nozzle assembly is manufactured so that when the fluid pressure becomes higher or lower, the cross-section of the fluid passage becomes larger or smaller.

[0005] The conventional nozzle assembly is made of an elastic material so that the cross-section of the fluid channel becomes larger or smaller as the fluid pressure changes as described above. At the same time, according to the conventional nozzle assembly, when the fluid pressure of the fluid flowing in the fluid channel becomes too high, plastic deformation occurs, and thus the original function cannot be further performed.

[0006] Therefore, there has recently been an increased demand for a nozzle assembly that can minimize plastic deformation regardless of the magnitude of the fluid pressure. Summary of the invention

[0007] The nozzle assembly according to the present invention can be fixed to the body of a vehicle. In particular, the nozzle assembly can be a component of an injector configured to inject a fluid under pressure to a target location, such as a hydrogen fuel cell of a vehicle.

[0008] One aspect of the present invention provides a nozzle assembly that can ensure durability performance by minimizing plastic deformation regardless of the magnitude of fluid pressure.

[0009] The technical problems to be solved by the present invention are not limited to the above-mentioned problems, and those skilled in the art to which the present invention belongs will clearly understand any other technical problems not mentioned herein through the following description.

[0010] According to one aspect of the present invention, the nozzle assembly includes a first nozzle portion and a second nozzle portion, the first nozzle portion providing a fluid channel in which a fluid flows, the second nozzle portion being arranged to surround the first nozzle portion, and when an imaginary straight line passing through the fluid channel and extending in a direction in which the fluid flows is defined as a reference straight line, the first nozzle portion includes a spacing area having a shape that is concave in a direction facing the reference straight line so as to be spaced apart from a portion of the second nozzle portion.

[0011] The spacing region may be recessed in a radial direction of the second nozzle portion.

[0012] In addition, the nozzle assembly may further include an attachment region having a shape protruding in a direction becoming farther from the reference straight line to be attached to another portion of the second nozzle part.

[0013] Furthermore, a first distance which is a spacing distance between the spacing area and the reference straight line may be smaller than a second distance which is a spacing distance between the attachment area and the reference straight line.

[0014] In addition, the fluid channel can be defined by the inner surface of the first nozzle part, and the inner surface of the first nozzle part can include a first inner surface and a second inner surface, the first inner surface defines the inner surface of the spacing area and has a cloak shape; the second inner surface defines the inner surface of the attachment area and has a bay shape.

[0015] Furthermore, a radius of curvature of the first inner surface in a radial direction may be greater than or equal to a radius of curvature of the second inner surface in a radial direction, the radial direction being a direction perpendicular to the reference straight line.

[0016] In addition, the radial direction can be defined as a direction perpendicular to the reference straight line, and the radius of curvature in the radial direction of at least a portion of the outer surface of the attachment area arranged on the opposite side of the second inner surface can correspond to the radius of curvature in the radial direction of at least a portion of the inner surface of the second nozzle portion.

[0017] In addition, when the direction facing the reference straight line in the radial direction is defined as a contraction direction and the direction becoming farther away from the reference straight line in the radial direction is defined as an expansion direction, each of the first nozzle portion and the second nozzle portion can be configured to expand in the expansion direction or contract in the contraction direction relative to the reference straight line in a state between a first state and a second state, in which the fluid channel is not expanded and in which the fluid channel is expanded more than in the first state.

[0018] In addition, the inner surface of the first nozzle portion can be configured to contact the fluid flowing in the fluid channel, the first nozzle portion can be configured to expand relative to a reference straight line through the contacted fluid when the fluid pressure of the fluid is higher than a threshold pressure, and the second nozzle portion can be configured to expand relative to the reference straight line through the expansion of the first nozzle portion.

[0019] In addition, a portion of the inner surface of the second nozzle portion can be configured to contact a portion of the outer surface of the first nozzle portion, the second nozzle portion can be configured to contract relative to a reference straight line by a restoring force when the fluid pressure of the fluid becomes lower from the expanded state of the first nozzle portion, and the first nozzle portion can be configured to contract relative to the reference straight line by the restoring force of the second nozzle portion.

[0020] In addition, when the first nozzle portion switches from the first state to the second state, the displacement of the end of the spacing area along the contraction direction relative to the reference straight line can be greater than the displacement of the end of the attachment area along the contraction direction relative to the reference straight line.

[0021] In addition, the second nozzle portion can be configured to squeeze the first nozzle portion along the contraction direction when the first nozzle portion switches from the first state to the second state, and when the first nozzle portion is in the second state, the deformation of the first reference value or above of the attachment area can be constrained by the second nozzle portion, and the deformation of the second reference value or above of the spacing area can be constrained by the attachment area.

[0022] In addition, when the first nozzle portion switches from the first state to the second state, the spacing area can be configured to deform so that the curvature radius of the spacing area becomes larger. When the spacing area is deformed so that the curvature radius becomes larger, an expansion resistance applied along the contraction direction can be formed in the first nozzle portion.

[0023] In addition, the spacing area may include a first spacing area and a second spacing area, the first spacing area defines one side of the spacing area in the contraction direction and defines a portion of the fluid channel; the second spacing area defines one side of the spacing area in the expansion direction and faces the inner surface of the second nozzle portion, when the first nozzle portion is in the second state, a compressive force can be applied to the first spacing area, and a tensile force can be applied to the second spacing area.

[0024] Furthermore, an end portion of the first spacing region in the contraction direction may have a convex shape in the contraction direction, and an end portion of the second spacing region in the expansion direction may have a concave shape in the contraction direction.

[0025] In addition, when the first nozzle portion is in the first state, the first thickness as the radial thickness of the first spacing area can be greater than or equal to the second thickness as the radial thickness of the second spacing area, and when an imaginary area formed between the first spacing area and the second spacing area relative to the radial direction is a boundary area so that the first spacing area and the second spacing area are divided, the first thickness can be defined as the radial spacing distance between the end of the first spacing area in the first state in the contraction direction and the boundary area, and the second thickness can be defined as the radial spacing distance between the end of the second spacing area in the first state in the expansion direction and the boundary area.

[0026] In addition, in a case where an area of ​​the second nozzle unit facing the spacing area is defined as the (2-1) nozzle unit and an area of ​​the second nozzle unit facing the attachment area is defined as the (2-2) nozzle unit, when the first nozzle unit switches from the first state to the second state, the (2-1) nozzle unit can be configured to expand with the same first displacement relative to the reference straight line, and the (2-2) nozzle unit can be configured to expand with the same displacement relative to the reference straight line.

[0027] Furthermore, when the first nozzle portion switches from the first state to the second state, the first displacement may be less than or equal to the second displacement.

[0028] Furthermore, when the first nozzle portion and the second nozzle portion are switched from a first state to a second state, a strain of the second nozzle portion may be less than or equal to a strain of the first nozzle portion.

[0029] Furthermore, a radial thickness of a central portion of the spacing region may be greater than or equal to a radial thickness of a central portion of the attachment region.

[0030] Furthermore, a plurality of spacing regions may be provided, and the plurality of spacing regions may be arranged to be spaced apart from each other along a circumferential direction of the second nozzle part.

[0031] In addition, the second nozzle portion may extend in a direction in which the fluid flows and may have a hollow portion inside thereof, and the first nozzle portion may be disposed in the hollow portion of the second nozzle portion.

[0032] Furthermore, the spacing region and the attachment region may be integrally formed.

[0033] Furthermore, the first nozzle portion and the second nozzle portion may be formed of an elastic material.

[0034] Furthermore, the first nozzle portion and the second nozzle portion may be integrally formed.

[0035] Furthermore, the first nozzle portion and the second nozzle portion may be separable individual members, and an elastic modulus of the first nozzle portion may be greater than or equal to an elastic modulus of the second nozzle portion.

[0036] The vehicle may include the above-described nozzle assembly. For example, the vehicle may be a fuel cell vehicle, and the nozzle assembly may be a component of an injector for injecting pressurized fluid into a hydrogen fuel cell of the vehicle.

[0037] According to another aspect, the nozzle assembly includes a first nozzle portion and a second nozzle portion, the first nozzle portion providing a fluid channel in which a fluid flows, the first nozzle portion expanding or contracting in a state between a first state and a second state, in which the fluid channel is not expanded in the first state, and in which the fluid channel is expanded more than in the first state, the second nozzle portion supporting the first nozzle portion, forming a curvature convex along a contraction direction on at least a portion of the first nozzle portion, the contraction direction being the direction in which the first nozzle portion contracts, and when the first nozzle portion switches from the second state to the first state, the second nozzle portion is configured to squeeze the first nozzle portion along the contraction direction so that a restoring force is applied to the first nozzle portion in the contraction direction.

[0038] In addition, when the first nozzle portion switches from the second state to the first state, at least a portion of the first nozzle portion can be deformed so that the radius of curvature becomes smaller while being supported by the second nozzle portion, and when at least a portion of the first nozzle portion is deformed so that the radius of curvature becomes smaller, a restoring force can be applied to the first nozzle portion in the contraction direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings:

[0040] Figure 1 is a perspective view of an ejector according to an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram showing a nozzle assembly when a first nozzle portion according to an embodiment of the present invention is switched from a first state to a second state;

[0042] Figure 3 is a schematic diagram showing a nozzle assembly when a first nozzle portion according to an embodiment of the present invention is switched from a second state to a first state;

[0043] Figure 4 is a schematic diagram showing forces applied to the first spacing region and the second spacing region when the first nozzle portion is in the second state according to an embodiment of the present invention;

[0044] Figure 5is a schematic diagram showing a nozzle assembly according to another embodiment of the present invention when a first nozzle portion is in a first state; and

[0045] Figure 6 is a schematic diagram showing a nozzle assembly when a first nozzle portion is in a second state according to another embodiment of the present invention.

[0046] Description of reference numerals:

[0047] 1: Injector

[0048] 10: Nozzle assembly

[0049] 100a, 100b: first nozzle part

[0050] 110a, 110b: spacing area

[0051] 111a: First spacer area

[0052] 112a: Second interval area

[0053] 120a, 120b: Attachment area

[0054] 200: Second nozzle section. DETAILED DESCRIPTION

[0055] It should be understood that the term "vehicle" or "vehicular" or other similar terms as used herein generally include motor vehicles, such as passenger automobiles including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including various boats and ships, aircraft, etc., and include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from non-petroleum energy sources). As referred to herein, a hybrid vehicle is a vehicle having two or more sources of power, such as both gasoline-powered and electric-powered vehicles.

[0056] The terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, the singular "one", "one" and "said" are intended to also include plural forms, unless the context clearly states otherwise. It will be further understood that when the terms "including" and / or "including" are used in this specification, it is indicated that there are the features, numerical values, steps, operations, elements and / or components, but it is not excluded that there are or add one or more other features, numerical values, steps, operations, elements, components and / or their groups. As used herein, the term "and / or" includes any and all combinations of one or more related enumerated items. Throughout the specification, unless explicitly described to the contrary, the word "including" and variations such as "including" or "including" will be understood to imply the inclusion of the elements but do not exclude any other elements. In addition, the terms "unit", "device", "component" and "module" described in the specification represent units for performing at least one function and operation, and can be implemented by hardware components or software components and their combinations.

[0057] In addition, the control logic of the present invention can be implemented as a non-volatile computer readable medium on a computer readable medium, which contains executable program instructions executed by a processor, a controller, etc. Examples of computer readable media include, but are not limited to, ROM, RAM, compact disk (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer readable medium can also be distributed in a network-connected computer system so that the computer readable medium is stored and executed in a distributed manner, for example, through a telematics server or a controller area network (CAN).

[0058] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. When adding reference numerals to components of the accompanying drawings, it should be noted that the same components are represented by the same reference numerals even if they are drawn in different drawings. In addition, when describing embodiments of the present invention, when it is determined that a detailed description of related known configurations and functions may hinder the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

[0059] In addition, when describing the components of the embodiments of the present invention, terms such as first, second, "A", "B", (a), (b) and the like may be used. These terms are only used to distinguish the components, and the nature, order and sequence of the corresponding components are not limited by these terms. When describing that a component is "connected to" another component, "extruded by" another component, or "flows into" another component, it should be understood that the former component can be directly connected to the latter component, directly extruded by the latter component, or directly flow into the latter component, but a third component can be "connected", "extruded" or "flowed" between the two components.

[0060] Hereinafter, an injector 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0061] Reference Figure 1 The injector 1 can inject a fluid with pressure to a target location (eg, a hydrogen fuel cell). As an example, the injector 1 can be disposed in a vehicle. The injector 1 can include a nozzle assembly 10 , a support body 20 , and a fluid supply device 30 .

[0062] The nozzle assembly 10 may receive fluid from the fluid supply device 30. In the nozzle assembly 10, the fluid supplied from the fluid supply device 30 may be ejected to the outside. As an example, the nozzle assembly 10 may be a variable nozzle configured to change the volume of the fluid passage "P" when the fluid pressure of the fluid flowing in the fluid passage "P" changes.

[0063] Further references Figure 2 , the nozzle assembly 10 can expand so that when the fluid pressure of the fluid flowing in the fluid passage "P" becomes higher, the volume of the fluid passage "P" becomes larger. In addition, referring to Figure 3 When the fluid pressure of the fluid flowing in the fluid passage “P” becomes lower, the nozzle assembly 10 may be contracted from the expanded state of the nozzle assembly 10 so that the volume of the fluid passage “P” becomes smaller.

[0064] In the specification, the expression that a component expands may refer to that all regions of a component move farther from the reference straight line “C”. In addition, the expression that a component contracts may refer to that all regions of a component become closer to the reference straight line “C”. The nozzle assembly 10 may include a first nozzle portion 100a and a second nozzle portion 200.

[0065] The first nozzle portion 100a may provide a fluid channel "P" configured to allow a fluid to flow therein. The first nozzle portion 100a may have a shape that is rotationally symmetrical relative to a reference straight line "C". A rotationally symmetrical shape may refer to a shape that is considered to be in an original state (corresponding state) even if it is rotated 360 degrees / n (n is an arbitrary integer) around a specific rotation axis. For example, the first nozzle portion 100a may have a shape that is (rotationally) symmetrical with respect to the reference straight line "C" an even number of times. In a detailed example, the first nozzle portion 100a may have a shape that is (rotationally) symmetrical four times (n=4) relative to the reference straight line "C". In a more detailed example, the first nozzle portion 100a rotated 90 degrees around the reference straight line "C" and the first nozzle portion 100a before the rotation are in the same state.

[0066] The reference straight line “C” may refer to an imaginary straight line that passes through the fluid channel “P” (eg, the center of the fluid channel “P”) and extends in a direction in which a fluid (fluid flowing in the fluid channel “P”) flows.

[0067] As an example, the material of the first nozzle portion 100a may be an elastic material. The inner surface of the first nozzle portion 100a may define a fluid channel "P". That is, the inner surface of the first nozzle portion 100a may have a shape that surrounds the fluid channel "P". The inner surface of the first nozzle portion 100a may refer to the surface of the first nozzle portion 100a in the contraction direction. The contraction direction may refer to a direction that becomes closer to the reference straight line "C" in the radial direction. The radial direction may be defined as the direction in which the reference straight line "C" and the second nozzle portion 200 face each other when the second nozzle portion 200 is observed in the direction in which the reference straight line "C" extends. In addition, the outer surface of the first nozzle portion 100a may refer to the surface of the first nozzle portion 100a in the expansion direction. The expansion direction may refer to a direction opposite to the contraction direction. That is, the expansion direction may refer to a direction that becomes farther from the reference straight line "C" in the radial direction.

[0068] The inner surface of the first nozzle portion 100a may contact (e.g., directly contact) the fluid flowing in the fluid channel "P". For example, when the fluid pressure of the contacted fluid is higher than a threshold pressure, the first nozzle portion 100a may expand relative to the reference straight line "C" by the fluid. In addition, when the first nozzle portion 100a expands, the second nozzle portion 200 may expand relative to the reference straight line "C".

[0069] Refer again Figure 2 and Figure 3, the first nozzle portion 100a can be deformed in an expansion direction and a contraction direction relative to the reference straight line "C" between the first state and the second state. When the first nozzle portion 100a is in the first state, the fluid channel "P" can be in an initial state without expansion. For example, when the fluid pressure of the fluid flowing in the fluid channel "P" is a specific reference pressure or lower, the first nozzle portion 100a can be in the first state. The first state can be called a "contracted state" or an "initial state".

[0070] In addition, when the first nozzle portion 100a is in the second state, the fluid channel "P" may be in a state that is more expanded than in the first state. For example, when the fluid pressure of the fluid flowing in the fluid channel "P" is higher than the reference pressure, the first nozzle portion 100a may be in the second state. The second state may be referred to as an "expanded state". The first nozzle portion 100a may include a spacing area 110a and an attachment area 120a.

[0071] The spacing region 110a may be disposed to be spaced apart from a portion of the second nozzle unit 200. For example, the portion of the second nozzle unit 200 may refer to a portion of an inner surface of the second nozzle unit 200 facing an outer surface of the spacing region 110a.

[0072] The spacing area 110a may have a shape that is recessed in the direction facing the reference straight line in the radial direction. In the radial direction, the direction facing the reference straight line may be defined as the same direction as the contraction direction. In addition, in the radial direction, the direction that becomes farther from the reference straight line may be defined as the same direction as the expansion direction. That is, the spacing area 110a may have a shape that protrudes in the contraction direction, which is the direction in which a portion of the second nozzle portion 200 faces the reference straight line "C". For example, the inner surface of the spacing area 110a may have a cape shape that protrudes in the contraction direction. The inner surface of the spacing area 110a may be referred to as a "first inner surface".

[0073] In addition, when the first nozzle section 100a is in the second state, a restoring force in the contraction direction due to elasticity may be applied to the spacing area 110a. That is, when the first nozzle section 100a is switched from the second state to the first state, the spacing area 110a may be contracted relative to the reference straight line "C" by the restoring force. For example, when the first nozzle section 100a is switched from the second state to the first state, the second nozzle section 200 may squeeze the first nozzle section 100a in the contraction direction so that a restoring force in the contraction direction is applied to the first nozzle section 100a. That is, the second nozzle section 200 in the expanded state may provide a portion of the contraction restoring force applied thereto to the first nozzle section 100a. In this way, the first nozzle section 100a may be contracted relative to the reference straight line "C" by the contraction restoring force provided from the second nozzle section 200.

[0074] In addition, when the first nozzle section 100a is switched from the first state to the second state, the spacing area 110a may be deformed so that the radius of curvature of the first inner surface becomes larger while being supported by the second nozzle section 200. In this way, when the spacing area 110a is deformed so that the radius of curvature of the first inner surface becomes larger, an expansion resistance applied in the contraction direction may be formed in the first nozzle section 100a. The expansion resistance may refer to a force that resists a force applied to the first nozzle section 100a in the expansion direction while the first nozzle section 100a is expanding (as an example, a first force that is a force applied to the first nozzle section 100a in the expansion direction by the fluid pressure of the fluid flowing in the fluid channel "P").

[0075] For example, when the expansion resistance is lower than the first force, the first nozzle portion 100a may expand. As another example, when the expansion resistance and the first force are the same, the expansion and contraction of the first nozzle portion 100a may stop. As another example, when the expansion resistance is higher than the first force, the first nozzle portion 100a may contract.

[0076] As an example, the expansion resistance may refer to an elastic restoring force in the contraction direction due to the elasticity formed in the spacing region 110a itself. For example, the spacing region 110a may be formed of an elastic material, by which a restoring force due to the elasticity may be formed in the spacing region 110a itself. That is, since the first nozzle portion 100a is formed of an elastic material that allows the size of the radius of curvature to vary, the expansion resistance may be applied to the first nozzle portion 100a by its own shape. That is, the first nozzle portion 100a may be contracted relative to the reference straight line "C" by its own shape and the contraction restoring force provided by the second nozzle portion 200.

[0077] When the first nozzle portion 100a is switched from the first state to the second state, the size of the expansion of the central portion of the spacing region 110a may be greater than the size of the expansion of the peripheral portion of the spacing region 110a. In addition, when the first nozzle portion 100a is switched from either the first state or the second state to the other state, the size of the expansion or contraction of the central portion of the spacing region 110a may be greater than the size of the expansion or contraction of the peripheral portion of the spacing region 110a. In addition, when the first nozzle portion 100a is switched from the first state to the second state, the radius of curvature in the radial direction of the first inner surface may become larger.

[0078] The central portion of the spacing region 110a may refer to an area of ​​the spacing region 110a that is closest to the reference straight line "C". In addition, the peripheral portion of the spacing region 110a may refer to a remaining area of ​​the spacing region 110a except the central portion. The peripheral portion of the spacing region 110a may be connected to the attachment region 120a. The spacing region 110a may include a first spacing region 111a and a second spacing region 112a.

[0079] The first spacing region 111a may define one side of the spacing region 110a along the contraction direction. The first spacing region 111a may define a portion of the fluid passage "P". For example, the first spacing region 111a may define a portion of the fluid passage "P", and the attachment region 120a may define the remaining portion of the fluid passage "P".

[0080] A surface of the first spacing region 111a in the contraction direction may define a portion of an inner surface of the first nozzle portion 100a. An end portion of the first spacing region 111a in the contraction direction may have a convex shape in the contraction direction.

[0081] Further references Figure 4 When the first nozzle portion 100a is in the second state, the compressive force F1 may be applied to the first spacing region 111a. For example, when the first nozzle portion 100a is in the second state, the compressive force F1 may be applied to the first spacing region 111a in a direction from the peripheral portion of the spacing region 110a toward the central portion thereof.

[0082] The second spacing region 112a may define one side of the spacing region 110a in the expansion direction. The second spacing region 112a may face the inner surface of the second nozzle portion 200. The surface of the second spacing region 112a may define a portion of the outer surface of the first nozzle portion 100a. The end of the second spacing region 112a in the expansion direction may have a shape that is concave in the contraction direction. An empty space may be defined between the second spacing region 112a and the second nozzle portion 200.

[0083] In addition, when the first nozzle portion 100a is in the second state, a tensile force F2 may be applied to the second spacing region 112a. For example, when the first nozzle portion 110a is in the second state, a tensile force F2 may be applied to the second spacing region 112a in a direction from the central portion of the spacing region 110a to the peripheral portion thereof.

[0084] A boundary region (eg, Figure 3). The boundary region may divide the first spacing region 111a and the second spacing region 112a. For example, the boundary region may be defined as an imaginary curved surface defined between the first spacing region 111a and the second spacing region 112a with respect to the radial direction.

[0085] In more detail, the boundary region may refer to a boundary that distinguishes a region of the spacing region 110a to which the compression force F1 is applied (for example, the first spacing region 111a) from a region of the spacing region 110a to which the tension force F2 is applied (for example, the second spacing region 112a) with respect to the radial direction. For example, the compression force F1 may be applied to a region of the spacing region 110a that is closer to the contraction direction than the boundary region (for example, the first spacing region 111a), and the tension force F2 may be applied to a region of the spacing region 110a that is closer to the expansion direction than the boundary region (for example, the second spacing region 112a).

[0086] In addition, when the nozzle assembly 10 is viewed along the direction in which the reference straight line "C" extends, the boundary area may be formed to bulge in the contraction direction. In a detailed example, the central portion of the boundary area may be located between the central portion of the first spacing area 111a and the central portion of the second spacing area 112a. In addition, the peripheral portion of the boundary area may extend to bend from the central portion of the boundary area toward the second nozzle portion 200. A plurality of boundary areas may be formed to correspond to the plurality of spacing areas 110a, respectively.

[0087] In addition, refer again Figure 3 , when the first nozzle portion 100a is in the first state, the radial thickness (first thickness a1) of the first spacing region 111a may be greater than the radial thickness (second thickness a2) of the second spacing region 112a. The first thickness a1 may be defined as the radial spacing distance between the end of the first spacing region 111a in the contraction direction and the boundary region. In addition, the second thickness a2 may be defined as the radial spacing distance between the end of the second spacing region 112a in the expansion direction and the boundary region.

[0088] In addition, as the first thickness a1 becomes larger, the deformation of the shape of the first spacer region 111a can become smaller due to the compressive force F1 applied to the first spacer region 111a. In this way, when the deformation of the shape of the first spacer region 111a becomes smaller, the plastic deformation of the first spacer region 111a can be minimized. At the same time, the spirit of the present invention is not limited thereto, and the first thickness a1 and the second thickness a2 can be the same.

[0089] In addition, when the first nozzle portion 100a is in the first state, the radius of curvature of the end of the first spacing area 111a in the contraction direction in the radial direction may be greater than the radius of curvature of the end of the second spacing area 112a in the expansion direction in the radial direction. However, the present invention is not limited to this example, and the radius of curvature of the end of the first spacing area 111a in the contraction direction in the radial direction may be the same as the radius of curvature of the end of the second spacing area 112a in the expansion direction in the radial direction. The radial direction may refer to a direction perpendicular to the reference straight line "C". The radial direction may be understood as an expansion direction and a contraction direction. That is, when the first nozzle portion 100a is in the first state, the radius of curvature of the inner surface of the spacing area 110a in the radial direction may be greater than the radius of curvature of the outer surface of the spacing area 110a in the radial direction. In addition, as the radius of curvature in the radial direction of the end portion of the first spacing region 111a along the contraction direction becomes larger, the deformation of the shape of the first spacing region 111a can become smaller due to the compression force F1 applied to the first spacing region 111a. In this way, when the deformation of the shape of the first spacing region 111a becomes smaller, the plastic deformation of the first spacing region 111a can be minimized.

[0090] The attachment area 120a may be attached to another portion of the second nozzle unit 200. For example, the other portion of the second nozzle unit 200 may refer to a portion of the inner surface of the second nozzle unit 200 facing the outer surface of the attachment area 120a. In addition, the other portion of the second nozzle unit 200 may be attached to the outer surface of the attachment area 120a.

[0091] When the first nozzle portion 100a switches from the first state to the second state, the attachment area 120a may press another portion of the second nozzle portion 200 in the expansion direction. In addition, when the first nozzle portion 100a switches from the second state to the first state, the second nozzle portion 200 may press the attachment area 120a in the contraction direction.

[0092] The attachment area 120a may have a shape that protrudes in a direction that becomes farther from the reference straight line "C" in the radial direction. That is, the attachment area 120a may have a shape that protrudes in an expansion direction, which is a direction in which the reference straight line "C" faces another part of the second nozzle portion 200. For example, the inner surface of the attachment area 120a may have a bay shape that is concave in the expansion direction. The inner surface of the attachment area 120a may be referred to as a "second inner surface". When the nozzle assembly 10 is observed in the direction of fluid flow, the first inner surface and the second inner surface may have a shape that is continuous with each other without any gaps.

[0093] In addition, the first inner surface may have a greater radius of curvature in the radial direction than the second inner surface. That is, the inner surface of the attachment region 120a may be more concave in the expansion direction than the inner surface of the spacing region 110a may be more convex in the contraction direction.

[0094] In addition, the first distance d1, which is the spacing distance between the spacing area 110a and the reference straight line "C", may be smaller than the second distance d2, which is the spacing distance between the attachment area 120a and the reference straight line "C". The first distance d1 may refer to the radial spacing distance between the first inner surface and the reference straight line "C". In addition, the second distance d2 may refer to the radial spacing distance between the second inner surface and the reference straight line "C".

[0095] In addition, when the first nozzle portion 100a is in the second state, a restoring force in the contraction direction may be applied to the attachment area 120a. For example, when the first nozzle portion 100a is switched from the second state to the first state, the attachment area 120a may be contracted relative to the reference straight line "C" by the restoring force. In a more detailed example, when the first nozzle portion 100a is switched from the first state to the second state, the size of the end expansion of the spacing area 110a in the contraction direction may be greater than the size of the end expansion of the attachment area 120a in the contraction direction. That is, when the first nozzle portion 100a expands, the first deformation T11 as the deformation of the spacing area 110a may be greater than the second deformation T12 as the deformation of the attachment area 120a.

[0096] In addition, when the first nozzle portion 100a is switched from the first state to the second state, the size of the expansion of the central portion of the attachment area 120a may be greater than the size of the expansion of the peripheral portion of the attachment area 120a. In addition, when the first nozzle portion 100a is switched from either the first state or the second state to the other state, the size of the expansion or contraction of the central portion of the attachment area 120a may be greater than the size of the expansion or contraction of the peripheral portion of the attachment area 120a. In addition, when the first nozzle portion 100a is switched from the second state to the first state, the radius of curvature of the second inner surface in the radial direction may become larger.

[0097] The central portion of the attachment area 120a may refer to the area of ​​the attachment area 120a that is farthest from the reference straight line "C". In addition, the peripheral portion of the attachment area 120a may refer to the remaining area of ​​the attachment area 120a except the central portion. The peripheral portion of the attachment area 120a may be connected to the peripheral portion of the spacing area 110a.

[0098] The radius of curvature of at least a portion of the outer surface of the attachment area 120a in the radial direction may correspond to the radius of curvature of at least a portion of the inner surface of the second nozzle portion 200 in the radial direction. The outer surface of the attachment area 120a may be arranged on the opposite side of the second inner surface, and may define the surface of the attachment area 120a in the expansion direction. For example, the radius of curvature of a portion of the outer surface of the attachment area 120a in the radial direction that contacts the inner surface of the second nozzle portion 200 may be the same as the radius of curvature of a portion of the outer surface of the second nozzle portion that contacts the attachment area 120a in the radial direction.

[0099] In addition, when the first nozzle portion 100a is in the second state, the attachment area 120a may be supported by the second nozzle portion 200, and the spacing area 110a may be supported by the attachment area 120a. For example, when the first nozzle portion 100a is in the second state, the attachment area 120a may be suppressed from deforming to a first reference value or more by the second nozzle portion 200. That is, the second nozzle portion 200 may limit the attachment area 120a from over-expanding to exceed the first reference value. The first reference value may refer to the maximum value of the strain that does not cause plastic deformation in the attachment area 120a.

[0100] In addition, the attachment area 120a can limit the deformation of the spacing area 110a to exceed the second reference value. That is, the attachment area 120a can limit the excessive expansion of the spacing area 110a to exceed the second reference value. The second reference value can refer to the maximum value of the strain that does not cause plastic deformation in the spacing area 110a.

[0101] In addition, a plurality of spacing regions 110a and a plurality of attachment regions 120a may be provided. For example, four spacing regions 110a and four attachment regions 120a may be provided. The plurality of spacing regions 110a and the plurality of attachment regions 120a may be arranged alternately along the circumferential direction of the second nozzle portion 200. That is, one spacing region 110a may be arranged between two adjacent attachment regions 120a among the plurality of attachment regions 120a. In addition, one spacing region 110a may extend between two adjacent attachment regions 120a. The spacing region 110a and the attachment region 120a may be formed integrally.

[0102] The second nozzle portion 200 may be arranged to surround the first nozzle portion 100a. A portion of the inner surface of the second nozzle portion 200 may contact (e.g., directly contact) a portion of the outer surface of the first nozzle portion 100a. When the fluid pressure of the fluid becomes lower from the state in which the first nozzle portion 100a is expanded, the second nozzle portion 200 may be contracted relative to the reference straight line "C" by a restoring force (as an example, a restoring force applied to the second nozzle portion 200 due to elasticity). That is, the fluid pressure of the fluid flowing in the fluid channel becomes lower relative to the state in which the first nozzle portion 100a is expanded, and the second nozzle portion 200 may be contracted relative to the reference straight line "C" by a restoring force applied to itself. In addition, the first nozzle portion 100a may be contracted relative to the reference straight line "C" by the restoring force of the second nozzle portion 200. For example, when the second nozzle portion 200 is contracted, the second nozzle portion 200 may squeeze the first nozzle portion 100a toward the radial inside.

[0103] The radius of the second nozzle part 200 may be greater than the radius of the first nozzle part 100a. Thus, since the radius of the second nozzle part 200 is greater than the radius of the first nozzle part 100a, the second strain, which is the strain when the second nozzle part 200 expands, may be smaller than the first strain, which is the strain when the first nozzle part 100a expands.

[0104] That is, when the same stress is applied to the first nozzle section 100a and the second nozzle section 200, the second strain may be less than or equal to the first strain. For example, since the first nozzle section 100a is in direct contact with the high-pressure fluid, the inner surface of the first nozzle section 100a may be directly squeezed to expand as a whole. In addition, the second nozzle section 200 may absorb the remaining pressure of the fluid pressure of the high-pressure fluid that is not absorbed by the first nozzle section 100a. As a detailed example, as a portion of the fluid pressure of the fluid is directly applied to the spacing area 110a and the attachment area 120a, the spacing area 110a and the attachment area 120a are deformed (as an example, expanded), while the remaining portion of the fluid pressure is only partially or indirectly applied to the (2-2)th nozzle section (the area of ​​the second nozzle section 200 that contacts the attachment area 120a) to be described below, so as to deform the (2-2)th nozzle section. Therefore, the second strain may be less than or equal to the first strain.

[0105] In this way, since the probability that the second strain is less than the first strain is high, even if the nozzle assembly 10 is operated for a long time, the probability of plastic deformation of the second nozzle unit 200 becomes lower. In addition, when the second state is switched to the first state without plastic deformation of the second nozzle unit 200, the second nozzle unit 200 can easily return to the contracted shape before expansion.

[0106] In addition, since the second nozzle unit 200 structurally constrains the first nozzle unit 100a, when the first nozzle unit 100a switches from the second state to the first state, the first nozzle unit 100a can easily return to the contracted shape before expansion. Therefore, compared with the area of ​​the first nozzle unit 100a in the initial first state, the deformation degree of the area of ​​the first nozzle unit 100a in the first state after the nozzle assembly 10 is operated multiple times can be minimized.

[0107] In addition, when the first nozzle unit 100a and the second nozzle unit 200 are in the second state, the second nozzle unit 200 can suppress the over-expansion of the first nozzle unit 100a. Therefore, compared with the area of ​​the first nozzle unit 100a in the initial second state, the deformation degree of the area of ​​the first nozzle unit 100a in the second state after the nozzle assembly 10 is operated multiple times can be minimized.

[0108] Thus, even after the nozzle assembly 10 is operated multiple times, the durability of the nozzle assembly 10 is improved because the deformation of the first nozzle portion 100a is minimized and the probability of plastic deformation of the second nozzle portion 200 is significantly low.

[0109] Thus, since the second strain is lower than the first strain, the second nozzle portion 200 can be easily restored to the original shape without any plastic deformation. Thus, since the original shape of the second nozzle portion 200 is easily restored, when the fluid pressure of the fluid flowing in the fluid channel "P" becomes lower, the first nozzle portion 100a contacting the second nozzle portion 200 can be easily restored to the original shape.

[0110] The second nozzle part 200 may extend along the flow direction, which is the direction in which the fluid flows. In addition, the second nozzle part 200 may have a cylindrical shape that is hollow inside it. In addition, the radial width of the end of the second nozzle part 200 along the flow direction may become smaller or equal as it moves along the flow direction. For example, the radial width of the end of the second nozzle part 200 along the flow direction may become smaller as it moves along the flow direction. In a detailed example, the end of the hollow part formed in the second nozzle part 200 along the flow direction may have a shape in which the radial width becomes smaller as it moves along the flow direction. However, the present invention is not limited to the example, and the end of the second nozzle part 200 along the flow direction may have a shape in which the radial width does not change as it moves along the flow direction, and the end of the hollow part of the second nozzle part 200 along the flow direction may have a shape in which the radial width becomes smaller as it moves along the flow direction. The first nozzle part 100a may be arranged in the hollow part of the second nozzle part 200.

[0111] In addition, the second nozzle part 200 and the first nozzle part 100a may be separate members that can be separated from each other. The first elastic modulus (ie, the elastic modulus of the first nozzle part 100a) may be greater than or equal to the second elastic modulus (ie, the elastic modulus of the second nozzle part 200).

[0112] In addition, the first nozzle thickness (i.e., the radial thickness of the first nozzle portion 100a) may be different from the second nozzle thickness (i.e., the radial thickness of the second nozzle portion 200). For example, the first nozzle thickness may be greater than or equal to the second nozzle thickness. The first nozzle thickness may refer to the radial spacing distance between the inner surface of the first nozzle portion 100a and the outer surface of the first nozzle portion 100a. In addition, the second nozzle thickness may refer to the radial spacing distance between the inner surface of the second nozzle portion 200 and the outer surface of the second nozzle portion 200.

[0113] In addition, the first central thickness (ie, the radial thickness of the central portion of the spacing region 110a) may be different from the second central thickness (ie, the radial thickness of the central portion of the attachment region 120a). For example, the first central thickness may be greater than or equal to the second central thickness.

[0114] The first center thickness may be defined as the radial spacing distance between the end of the center portion of the spacing region 110a in the contraction direction and the end of the center portion of the spacing region 110a in the expansion direction. In addition, the second center thickness may be defined as the spacing distance between the end of the center portion of the attachment region 120a in the contraction direction and the end of the center portion of the attachment region 120a in the expansion direction. In addition, the first center thickness may be defined as the sum of the first thickness a1 and the second thickness a2.

[0115] In this way, the nozzle assembly 10 may have a feature in which the first elastic modulus may be greater than or equal to the second elastic modulus, the first nozzle thickness may be greater than or equal to the second nozzle thickness, and the first center thickness may be greater than or equal to the second center thickness. By the features of the elastic modulus and thickness of the first nozzle portion 100a and the second nozzle portion 200, when the nozzle assembly 10 is deformed between the first state and the second state, it is possible to prevent only the first nozzle portion 100a from being deformed without any deformation of the second nozzle portion 200.

[0116] That is to say, when only the first nozzle portion 100a is deformed and the second nozzle portion 200 is not deformed, the excessive deformation of the first nozzle portion 100a cannot be constrained by the second nozzle portion 200, or no restoring force can be provided to the first nozzle portion 100a. The nozzle assembly 10 according to the spirit of the present invention can overcome these problems through the above-mentioned features.

[0117] That is, through the above-described features of the nozzle assembly 10 , excessive deformation of the first nozzle portion 100 a may be restrained by the second nozzle portion 200 or a restoring force may be provided to the first nozzle portion 100 a .

[0118] However, the spirit of the present invention is not limited to the example, and the first nozzle part 100 a and the second nozzle part 200 may be integrally formed.

[0119] The second nozzle unit 200 may include a (2-1)th nozzle unit and a (2-2)th nozzle unit. The (2-1)th nozzle unit may be defined as an area of ​​the second nozzle unit 200 facing the spacing area 110a. In addition, the (2-2)th nozzle unit may be defined as an area of ​​the second nozzle unit 200 facing the attachment area 120a. A plurality of (2-1)th nozzle units and a plurality of (2-2)th nozzle units may be provided. A plurality of (2-1)th nozzle units and a plurality of (2-2)th nozzle units may be alternately arranged along the circumferential direction of the second nozzle unit 200. In addition, a plurality of (2-1)th nozzle units and a plurality of (2-2)th nozzle units may be formed integrally.

[0120] When the first nozzle unit 100a switches from the first state to the second state, the plurality of (2-1)th nozzle units may expand by the same first displacement relative to the reference straight line "C". In addition, when the first nozzle unit 100a switches from the first state to the second state, the plurality of (2-2)th nozzle units may expand by the same second displacement relative to the reference straight line "C".

[0121] Furthermore, the first displacement may be smaller than or equal to the second displacement. When the first displacement is smaller than the second displacement, the radius of curvature of the (2-1)th nozzle portion in the radial direction may be larger than the radius of curvature of the (2-2)th nozzle portion in the radial direction.

[0122] In addition, all regions of the inner surface of the second nozzle portion 200 may be spaced apart the same distance from the reference straight line “C.” That is, when the second nozzle portion 200 is viewed in the flow direction, the inner surface of the second nozzle portion 200 may have a circular shape.

[0123] Return to reference Figure 3 , when the first nozzle unit 100a switches from the first state to the second state, all areas of the inner surface of the second nozzle unit 200 may expand by the same amount T2 relative to the reference straight line "C". In addition, when the first nozzle unit 100a switches from the second state to the first state, all areas of the inner surface of the second nozzle unit 200 may contract by the same amount T2 relative to the reference straight line "C". That is, when the first nozzle unit 100a switches from either the first state or the second state to the other state, the deformation T2 of all areas of the second nozzle unit 200 may be the same.

[0124] The support body 20 may be a frame that may support the nozzle assembly 10. The support body 20 may fix the nozzle assembly 10 to the vehicle body. In addition, the support body 20 may guide the fluid discharged from the fluid supply device 30 to the nozzle assembly 10.

[0125] The fluid supply device 30 may supply fluid to the nozzle assembly 10. The fluid supply device 30 may be various devices such as a reservoir, from which the fluid may be discharged to the nozzle assembly 10.

[0126] In the following, reference will be made to Figure 5 and Figure 6 A nozzle assembly 10 according to another embodiment of the present invention is described. In the description of another embodiment of the present invention, the differences from the first embodiment of the present invention will be mainly described. The nozzle assembly 10 may include a first nozzle portion 100b and a second nozzle portion 200. The description of the contents of the second nozzle portion 200 will be replaced by the description made in one embodiment of the present invention.

[0127] Reference Figure 5 and Figure 6 , the first nozzle portion 100b according to another embodiment of the present invention may have a shape that is odd-numbered times (rotationally) symmetrical with respect to the reference straight line "C". For example, the first nozzle portion 100b may have a shape that is three times (n=3) (rotationally) symmetrical with respect to the reference straight line "C". In a detailed example, the first nozzle portion 100b rotated 120 degrees with respect to the reference straight line "C" and the first nozzle portion 100b before the rotation may be in the same state. The first nozzle portion 100b may include a spacing area 110b and an attachment area 120b.

[0128] A plurality of spacing regions 110b and a plurality of attachment regions 120b may be provided. For example, three spacing regions 110b and three attachment regions 120b may be provided.

[0129] The nozzle assembly ensures durable performance by minimizing plastic deformation regardless of fluid pressure.

[0130] In addition, when describing the components of the embodiments of the present invention, terms such as first, second, "A", "B", (a), (b) and the like may be used. These terms are only used to distinguish the components, and the nature, order and sequence of the corresponding components are not limited by these terms. In addition, unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by technicians in the field to which the present invention belongs. It will be further understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and specification, and should not be interpreted in an idealized or overly formal sense unless clearly defined in this article.

[0131] The above description is a simple example of the technical spirit of the present invention. Without departing from the basic features of the present invention, the technical personnel in the field to which the present invention belongs can make various corrections and modifications to the present invention. Therefore, the embodiments disclosed in the present invention are not provided to limit the technical spirit of the present invention, but to describe the present invention, and the scope of the technical spirit of the present invention is not limited by the embodiments. Therefore, the technical scope of the present invention should be interpreted by the attached claims, and all technical spirits within the scope of equivalents fall within the scope of the present invention.

Claims

1. A nozzle assembly for a vehicle, comprising: a first nozzle portion configured to provide a fluid passage through which a fluid flows; and a second nozzle portion arranged to surround the first nozzle portion, Wherein, when an imaginary straight line passing through the fluid channel and extending in the direction of fluid flow is defined as a reference straight line, The first nozzle portion comprises: A spacing region is configured to be recessed in a direction facing the reference straight line to be spaced apart from a portion of the second nozzle portion.

2. The nozzle assembly for a vehicle according to claim 1, wherein: The spacing region is recessed in the radial direction of the second nozzle portion.

3. The nozzle assembly for a vehicle according to claim 2, further comprising: An attaching region having a shape protruding in a direction becoming farther from the reference straight line to be attached to another portion of the second nozzle part.

4. The nozzle assembly for a vehicle according to claim 3, wherein: A first distance, which is a spacing distance between the spacing area and the reference straight line, is smaller than a second distance, which is a spacing distance between the attachment area and the reference straight line.

5. The nozzle assembly for a vehicle according to claim 3, wherein: The fluid passage is defined by an inner surface of the first nozzle portion; The inner surface of the first nozzle portion comprises: a first inner surface defining an inner surface of the spacing region and having a cloak shape; and A second inner surface defines an inner surface of the attachment area and has a bay shape.

6. The nozzle assembly for a vehicle according to claim 5, wherein: A radius of curvature of the first inner surface in a radial direction is greater than or equal to a radius of curvature of the second inner surface in a radial direction, and the radial direction is a direction perpendicular to a reference straight line.

7. The nozzle assembly for a vehicle according to claim 5, wherein: The radial direction is defined as a direction perpendicular to the reference straight line; A radius of curvature in the radial direction of at least a portion of an outer surface of the attachment area arranged on an opposite side of the second inner surface corresponds to a radius of curvature in the radial direction of at least a portion of an inner surface of the second nozzle portion.

8. The nozzle assembly for a vehicle according to claim 3, wherein: When the direction facing the reference straight line in the radial direction is defined as the contraction direction and the direction becoming farther from the reference straight line in the radial direction is defined as the expansion direction, Each of the first nozzle portion and the second nozzle portion is configured to expand in an expansion direction or contract in a contraction direction relative to a reference straight line in a state between a first state and a second state, wherein the fluid channel is not expanded and wherein the fluid channel is more expanded than in the first state.

9. The nozzle assembly for a vehicle according to claim 8, wherein: The inner surface of the first nozzle portion is configured to contact the fluid flowing in the fluid channel, The first nozzle portion is configured to expand relative to a reference straight line by the contacting fluid when the fluid pressure of the fluid is higher than a threshold pressure, The second nozzle portion is configured to expand relative to a reference straight line through expansion of the first nozzle portion.

10. The nozzle assembly for a vehicle according to claim 9, wherein: A portion of the inner surface of the second nozzle portion is configured to contact a portion of the outer surface of the first nozzle portion, The second nozzle portion is configured to contract relative to the reference straight line by a restoring force when the fluid pressure of the fluid becomes lower from the state in which the first nozzle portion is expanded, The first nozzle portion is configured to be contracted relative to a reference straight line by a restoring force of the second nozzle portion.

11. The nozzle assembly for a vehicle according to claim 8, wherein: When the first nozzle unit switches from the first state to the second state, The displacement of the end of the spacing region in the contraction direction relative to the reference straight line is greater than the displacement of the end of the attachment region in the contraction direction relative to the reference curve.

12. The nozzle assembly for a vehicle according to claim 8, wherein: The second nozzle portion is configured to squeeze the first nozzle portion in a contraction direction when the first nozzle portion switches from the first state to the second state, When the first nozzle portion is in the second state, deformation of the attachment area by a first reference value or more is restrained by the second nozzle portion, and deformation of the spacing area by a second reference value or more is restrained by the attachment area.

13. The nozzle assembly for a vehicle according to claim 12, wherein: When the first nozzle portion switches from the first state to the second state, the spacing area is configured to deform so that the radius of curvature of the spacing area becomes larger, When the spacing region is deformed so that the radius of curvature becomes larger, an expansion resistance applied in the contraction direction is formed in the first nozzle portion.

14. The nozzle assembly for a vehicle according to claim 8, wherein: The spacing area includes: A first spacing region defining one side of the spacing region in the contraction direction and defining a portion of the fluid passage; and a second spacing region defining one side of the spacing region in the expansion direction and facing the inner surface of the second nozzle portion, When the first nozzle portion is in the second state, a compressive force is applied to the first spacing area, and a tensile force is applied to the second spacing area.

15. The nozzle assembly for a vehicle according to claim 14, wherein: The end of the first spacing area in the contraction direction has a shape that is convex in the contraction direction. An end portion of the second spacing region in the expansion direction has a shape that is concave in the contraction direction.

16. The nozzle assembly for a vehicle according to claim 14, wherein: When the first nozzle portion is in a first state, a first thickness as a radial thickness of the first spacing region is greater than or equal to a second thickness as a radial thickness of the second spacing region, When an imaginary area formed between the first spacing area and the second spacing area with respect to a radial direction is a boundary area so that the first spacing area and the second spacing area are divided: The first thickness is defined as a radial spacing distance between an end of the first spacing region in the contraction direction and the boundary region in the first state, The second thickness is defined as a radial spacing distance between an end portion of the second spacing region along the expansion direction and the boundary region in the first state.

17. The nozzle assembly for a vehicle according to claim 8, wherein: When the first nozzle unit and the second nozzle unit are switched from a first state to a second state, A strain of the second nozzle portion is less than or equal to a strain of the first nozzle portion.

18. The nozzle assembly for a vehicle according to claim 1, wherein: The radial thickness of the central portion of the spacing area is greater than or equal to the radial thickness of the central portion of the attachment area.

19. The nozzle assembly for a vehicle according to claim 1, wherein: A plurality of spacing regions are provided, and are arranged to be spaced apart from each other along a circumferential direction of the second nozzle portion.

20. The nozzle assembly for a vehicle according to claim 1, wherein The second nozzle portion extends along the direction of fluid flow and has a hollow portion therein. The first nozzle portion is disposed in a hollow portion of the second nozzle portion.

21. The nozzle assembly for a vehicle according to claim 1, wherein: The spacing area and the attachment area are formed integrally, The first nozzle portion and the second nozzle portion are formed of an elastic material.

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