Fluid filling system, nozzle device and receiver device

Abstract

The present disclosure relates to a fluid filling system, a nozzle device, and a receiver device, wherein the nozzle device includes: a filling nozzle configured to supply a filling fluid and arranged to be connected to a receiver provided in an object; a cover member surrounding the filling nozzle and the receiver; and a fluid supply unit that supplies an antifreeze fluid for suppressing freezing between the filling nozzle and the receiver to the interior of the cover member, thereby obtaining beneficial effects of suppressing freezing of the receiver and improving safety and reliability. Additionally, the nozzle device may include a hydrophobic coating for suppressing freezing.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority and benefits of Korean Patent Applications No. 10 - 2020 - 0038617, filed on March 30, 2020, and No. 10 - 2021 - 0005734, filed on January 15, 2021, the entire contents of which are incorporated herein by reference. Technical field

[0003] The present disclosure relates to a fluid filling system, a nozzle device, and a receiver device for improving safety and reliability. Background art

[0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0005] A fuel cell electric vehicle (FCEV) generates electrical energy through an electrochemical reaction between oxygen and hydrogen in a fuel cell stack and uses the electrical energy as a power source.

[0006] A fuel cell electric vehicle can continuously generate electricity regardless of the capacity of the battery by supplying fuel and external air, so it is highly efficient and emits almost no pollutants. Due to these advantages, continuous research and development are being carried out on fuel cell electric vehicles.

[0007] A fuel cell electric vehicle is provided with a hydrogen tank, and hydrogen is stored in the hydrogen tank through a hydrogen filling pipeline of a hydrogen storage system. The hydrogen stored in the hydrogen tank is depressurized by a regulator and supplied to the fuel cell stack along the hydrogen supply pipeline, and then used to generate electrical energy.

[0008] In addition, a hydrogen filling receptacle is provided in a fuel cell electric vehicle as a kind of connector connected to a filling nozzle for supplying hydrogen.

[0009] However, we found that during a rapid hydrogen filling process, the filling temperature of hydrogen is very low (e.g., - 33°C to - 40°C), so the connection part (the periphery of the receiver) between the filling nozzle and the receiver is frozen, and the freezing makes it impossible to separate the filling nozzle from the receiver in a timely manner after the hydrogen filling process is completed. Summary of the invention

[0010] The present disclosure provides a fluid filling system, a nozzle device, and a receiver device that can suppress freezing of a receiver connected to a filling nozzle and improve safety and reliability.

[0011] In particular, the present disclosure can suppress freezing of the receiver during a hydrogen filling process and easily separate the filling nozzle from the receiver after the hydrogen filling process is completed.

[0012] In addition, the present disclosure can reduce or minimize the deterioration of durability and safety caused by the freezing of the receiver.

[0013] In one form of the present disclosure, a nozzle device includes: a filling nozzle configured to supply a filling fluid and arranged to be connected to a receiver provided in an object; a cover member configured to surround the filling nozzle and the receiver; and a fluid supply unit configured to supply an antifreeze fluid for suppressing freezing between the filling nozzle and the receiver to the inside of the cover member.

[0014] The present disclosure can inhibit the freezing of the receiver connected to the filling nozzle and improve safety and reliability.

[0015] The present disclosure inhibits the freezing of the receiver and improves safety and reliability by supplying an antifreeze fluid for suppressing freezing to the inside of the cover member arranged to surround the filling nozzle and the receiver.

[0016] The fluid supply unit can have various structures capable of supplying the antifreeze fluid to the inside of the cover member.

[0017] For example, the fluid supply unit can include: an antifreeze fluid supply portion configured to supply the antifreeze fluid; and a heating portion configured to heat the antifreeze fluid supplied from the antifreeze fluid supply portion to the inside of the cover member to a preset temperature.

[0018] According to an exemplary form of the present disclosure, the fluid supply unit can include a dehumidifying portion configured to remove moisture from the antifreeze fluid supplied from the antifreeze fluid supply portion to the inside of the cover member.

[0019] As described above, since the moisture in the antifreeze fluid supplied to the inside of the cover member is removed, the beneficial effect of more effectively suppressing the connection portion between the filling nozzle and the receiver from freezing due to the very low hydrogen filling temperature during the hydrogen filling process can be obtained.

[0020] According to an exemplary form of the present disclosure, the antifreeze fluid supply portion or the heating portion can be configured to function as the dehumidifying portion without separately providing the dehumidifying portion. For example, the antifreeze fluid supply portion and the dehumidifying portion can be provided as a first integrated module that integrally integrates the antifreeze fluid supply portion and the dehumidifying portion. As another example, the heating portion and the dehumidifying portion can be provided as a second integrated module that integrally integrates the heating portion and the dehumidifying portion.

[0021] As described above, since the first integrated module (or the second integrated module) functions to supply the antifreeze fluid and remove moisture from the antifreeze fluid, it is not necessary to separately provide the dehumidifying portion. As a result, the beneficial effects of simplifying the structure, improving the design freedom and space utilization rate, and reducing the equipment manufacturing cost can be obtained.

[0022] According to an exemplary form of the present disclosure, an antifreeze fluid can be supplied to all positions inside the cover member where freezing may occur.

[0023] In some forms of the present disclosure, the nozzle device may include: a first flow path formed inside the cover member and configured to introduce the antifreeze fluid from the fluid supply unit into the first flow path; a second flow path formed between the nozzle body and the clamping unit and communicating with the first flow path; a third flow path formed between the cover member and the clamping unit and communicating with the first flow path; and a fourth flow path formed between the receiver and the cover member and communicating with the second and third flow paths, so that the antifreeze fluid is discharged to the outside of the cover member through the fourth flow path.

[0024] According to another exemplary form of the present disclosure, the nozzle device may include a control unit configured to selectively control at least one of the flow rate and temperature of the antifreeze fluid supplied to the inside of the cover member.

[0025] In particular, the nozzle device may include a temperature sensor configured to measure the temperature of the external air and a humidity sensor configured to measure the humidity of the external air. The control unit may control at least one of the flow rate and temperature of the antifreeze fluid based on the sensed values sensed by the temperature sensor and the humidity sensor.

[0026] According to other exemplary forms of the present disclosure, the nozzle device may include at least one of a first hydrophobic coating formed on at least one of the outer surface of the nozzle body and the inner surface of the clamping unit, a second hydrophobic coating formed on the outer surface of the receiver, and a third hydrophobic coating formed on the inner surface of the cover member.

[0027] As described above, since the surfaces where freezing may occur (e.g., the outer surface of the nozzle body, the inner surface of the clamping unit, and the inner surface of the cover member) are hydrophobic-treated, the adhesion of moisture contained in the air (or moisture contained in the antifreeze fluid) to the surfaces where freezing may occur can be minimized. As a result, the beneficial effect of more effectively suppressing the freezing of the connection portion between the filling nozzle and the receiver can be obtained.

[0028] In one form of the present disclosure, the filling nozzle may have various structures capable of selectively and detachably coupling to the receiver.

[0029] For example, the filling nozzle may include a nozzle body configured to be connected to the receiver and a clamping unit connected to the nozzle body and configured to selectively restrain on the circumferential surface of the receiver.

[0030] In another form, the clamping unit may include: a clamp rotatably connected to the nozzle body and configured to be supported on the circumferential surface of the receiver; and an elastic member configured to elastically support the rotation of the clamp relative to the nozzle body.

[0031] According to another exemplary form of the present disclosure, the filling fluid may include hydrogen, and the antifreeze fluid may include air.

[0032] According to an exemplary form of the present disclosure, a nozzle device may include: a filling nozzle configured to supply a filling fluid and arranged to be connected to a receiver provided in an object; and a first hydrophobic coating provided on the surface of the filling nozzle.

[0033] In particular, the filling nozzle may include: a nozzle body arranged to be connected to the receiver; and a clamping unit connected to the nozzle body and configured to selectively restrain on the circumferential surface of the receiver, wherein the first hydrophobic coating may be formed on the surface of at least one of the nozzle body and the clamping unit.

[0034] According to another exemplary form of the present disclosure, a nozzle device may include: a filling nozzle configured to supply a filling fluid and arranged to be connected to a receiver provided in an object; a cover member configured to surround the filling nozzle and the receiver; and a third hydrophobic coating formed on the inner surface of the cover member.

[0035] According to yet another exemplary form of the present disclosure, a receiver device may include: a receiver to which a filling nozzle configured to supply a filling fluid is connected; and a second hydrophobic coating formed on at least one of the outer surface and the inner surface of the receiver.

[0036] According to another aspect of the present disclosure, a fluid filling system may include: a filling nozzle configured to supply a filling fluid; a receiver provided in an object and configured to be connected to the filling nozzle; a cover member arranged to surround the filling nozzle and the receiver; and a fluid supply unit configured to supply an antifreeze fluid for suppressing freezing between the filling nozzle and the receiver to the inside of the cover member.

[0037] According to yet another aspect of the present disclosure, a fluid filling system may include: a filling nozzle configured to supply a filling fluid; a receiver provided in an object and configured to be connected to the filling nozzle; a cover member arranged to surround the filling nozzle and the receiver; and a hydrophobic coating provided on at least one of the surface of the filling nozzle, the surface of the receiver, and the inner surface of the cover member.

[0038] In particular, the fluid filling system may include a fluid supply unit configured to supply an antifreeze fluid for suppressing freezing between the filling nozzle and the receiver into the interior of the lid member.

[0039] Other application areas will become apparent from the description provided herein. It should be understood that the description and specific examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To make the present disclosure easy to understand, various forms of the present disclosure will now be described by way of example and with reference to the accompanying drawings, in which:

[0041] Figure 1 is a view for illustrating a fluid filling system according to an exemplary form of the present disclosure;

[0042] Figure 2 is a view for illustrating a fluid supply unit in a fluid filling system according to an exemplary form of the present disclosure;

[0043] Figure 3 is a view for illustrating a filling nozzle in a fluid filling system according to an exemplary form of the present disclosure;

[0044] Figure 4 is a view for illustrating a lid member in a fluid filling system according to an exemplary form of the present disclosure;

[0045] Figure 5 is a view for illustrating a flow path of the antifreeze fluid in a fluid filling system according to an exemplary form of the present disclosure;

[0046] Figure 6 is a view for illustrating a control method of a fluid supply unit in a fluid filling system according to an exemplary form of the present disclosure;

[0047] Figure 7 is a view for illustrating a nozzle device according to an exemplary form of the present disclosure; and

[0048] Figure 8 is a view for illustrating a receiver device according to an exemplary form of the present disclosure.

[0049] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. DETAILED DESCRIPTION

[0050] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that in all the drawings, corresponding reference numerals denote the same or corresponding components and features.

[0051] In the following, exemplary forms of the present disclosure will be described in detail with reference to the accompanying drawings.

[0052] However, the technical idea of the present disclosure is not limited to some exemplary forms described herein, and can be implemented in various different forms. Within the scope of the technical idea of the present disclosure, one or more constituent elements in the exemplary forms can be selectively combined and replaced.

[0053] In addition, unless specifically and clearly defined and stated otherwise, the terms (including technical terms and scientific terms) used in the exemplary forms of the present disclosure can be interpreted as meanings that can be generally understood by those of ordinary skill in the art to which the present disclosure pertains. The meanings of common terms such as those defined in a dictionary can be interpreted by considering the context meanings of the related art.

[0054] In addition, the terms used in the exemplary forms of the present disclosure are for explaining the exemplary forms and do not limit the present disclosure.

[0055] Unless otherwise specifically stated in the context of this specification, the singular form may also include the plural form. The interpretation of “at least one (or one or more) of A, B, and C” described herein may include one or more of all combinations that can be formed by combining A, B, and C.

[0056] In addition, terms such as “first”, “second”, “A”, “B”, “(a)”, and “(b)” may be used to describe the constituent elements of the exemplary forms of the present disclosure.

[0057] These terms are only for the purpose of distinguishing one constituent element from another, and the nature, order, or sequence of the constituent elements are not limited by these terms.

[0058] Furthermore, when a constituent element is described as “connected”, “coupled”, or “attached” to another constituent element, a constituent element can be directly connected, coupled, or attached to another constituent element or connected, coupled, or attached to another constituent element through another intervening constituent element.

[0059] In addition, the description of “forming or disposing another constituent element above (on) or below (under) a constituent element” not only includes the case where the two constituent elements are in direct contact with each other, but also includes the case where one or more additional constituent elements are formed or disposed between the two constituent elements. In addition, the expression “above (on) or below (under)” may include the meanings of the downward direction and the upward direction based on a constituent element.

[0060] Refer to Figures 1 to 6, a fluid filling system 10 in an exemplary form according to the present disclosure includes: a filling nozzle 600 configured to supply a filling fluid; a receiver 100 disposed in an object and configured to be connected to the filling nozzle 600; a cover member 700 configured to surround the filling nozzle 600 and the receiver 100; and a fluid supply unit 800 configured to supply an antifreeze fluid to the interior of the cover member 700 to inhibit freezing between the filling nozzle 600 and the receiver 100. As a reference, the fluid filling system 10 according to the present disclosure can fill various types of objects with various types of filling fluids according to required conditions and design specifications, and the present disclosure is not limited or restricted by the types of objects and filling fluids.

[0061] In addition, the term "object" in the present disclosure is defined to include both movable objects such as vehicles and immovable objects fixed to the ground such as storage facilities.

[0062] Furthermore, the term "filling fluid" in the present disclosure is defined as either a gaseous fluid or a liquid fluid, or a fluid mixture made by mixing a gaseous fluid and a liquid fluid.

[0063] Hereinafter, as an example, the configuration of a fluid filling system 10 in an exemplary form according to the present disclosure for filling hydrogen (filling fluid) into a fuel cell electric vehicle 20 (a passenger vehicle or a commercial vehicle) (object) will be described.

[0064] Referring to Figure 1 , the fuel cell electric vehicle 20 can be provided with a receiver 100, and a filling nozzle 600 for supplying hydrogen can be connected to the receiver 100.

[0065] Various types of receivers 100 that can be connected (coupled) to the filling nozzle 600 through a conventional coupling structure (e.g., a male-female coupling structure) can be used as the receiver 100, and the present disclosure is not limited or restricted by the type and structure of the receiver 100.

[0066] The fuel cell electric vehicle 20 is provided with a hydrogen tank 200 for storing hydrogen, and a manifold 300 is connected to the hydrogen tank 200.

[0067] For example, the fuel cell electric vehicle 20 can be provided with three hydrogen tanks 200, and the manifold 300 is commonly connected to the three hydrogen tanks 200. According to another exemplary form of the present disclosure, the fuel cell electric vehicle can be provided with four or more or two or fewer hydrogen tanks, and the present disclosure is not limited or restricted by the number of hydrogen tanks and the arrangement form of the hydrogen tanks.

[0068] The manifold 300 may have various structures capable of dividing the flow path of hydrogen, and the present disclosure is not limited or restricted by the type and structure of the manifold 300. For example, the manifold 300 may have a first port (not shown) connected to the hydrogen supply line 24, second to fourth ports (not shown) connected to three hydrogen tanks 200, and a fifth port (not shown) connected to the hydrogen filling line 22.

[0069] The fuel cell electric vehicle 20 may include a hydrogen filling line 22 connecting the receiver 100 and the manifold 300. The hydrogen supplied to the receiver 100 through the filling nozzle 600 is stored in the hydrogen tank 200 through the hydrogen filling line 22 and the manifold 300.

[0070] In addition, the fuel cell electric vehicle 20 includes a hydrogen supply line 24, and the hydrogen stored in the hydrogen tank 200 is supplied to the fuel cell stack 550 through the hydrogen supply line 24.

[0071] In one form, the hydrogen supply line 24 is configured to connect the manifold 300 provided in the fuel cell electric vehicle 20 and the fuel cell stack 550, and the hydrogen stored in the hydrogen tank 200 is supplied to the fuel cell stack 550 through the manifold 300 and the hydrogen supply line 24.

[0072] As a reference, the fuel cell stack 550 may have various structures capable of generating electricity through a redox reaction between a fuel (e.g., hydrogen) and an oxidant (e.g., air).

[0073] For example, the fuel cell stack 550 includes: a membrane electrode assembly (MEA) (not shown), with catalytic electrode layers attached to both sides of an electrolyte membrane through which hydrogen ions move, and an electrochemical reaction occurs in the catalytic electrode layer; a gas diffusion layer (GDL) (not shown), configured to uniformly distribute the reaction gas and used for transmitting the generated electric energy; gaskets (not shown) and fasteners (not shown), configured to maintain leak - tight sealing of the reaction gas and coolant and maintain an appropriate fastening pressure; and a separator plate (bipolar plate) (not shown), configured to move the reaction gas and coolant.

[0074] More specifically, in the fuel cell stack 550, hydrogen as a fuel and air (oxygen) as an oxidant are respectively supplied to the anode and cathode of the membrane electrode assembly through the flow paths in the separator plate, such that hydrogen is supplied to the anode and air is supplied to the cathode.

[0075] The hydrogen supplied to the anode is decomposed into hydrogen ions (protons) and electrons by a catalyst in the electrode layers provided on both sides of the electrolyte membrane. Only the hydrogen ions are selectively transported through the electrolyte membrane, which is a positive ion exchange membrane, to the cathode, and at the same time, the electrons are transported to the cathode through the gas diffusion layer and the separator plate, which act as conductors.

[0076] In the cathode, hydrogen ions supplied through the electrolyte membrane and electrons transported through the separator plate meet with oxygen in the air supplied to the cathode through the air supply device, resulting in a reaction that generates water. Due to the movement of hydrogen ions, electrons flow through the external wire, and a current is generated due to the flow of electrons.

[0077] In addition, a regulator 400 and a hydrogen supply device (fuel processing system (FPS)) 500 may be provided on the hydrogen supply line 24. The regulator 400 is configured to reduce the pressure of the hydrogen supplied to the fuel cell stack 550, and the hydrogen supply device (fuel processing system (FPS)) 500 is configured to adjust the supply amount of the hydrogen supplied to the fuel cell stack 550.

[0078] In one form, the regulator 400 is connected to the hydrogen supply line 24 and is provided between the manifold 300 and the fuel cell stack 550. The high-pressure (e.g., 700 bar) hydrogen supplied through the hydrogen supply line 24 can be supplied to the fuel cell stack 550 in a state where the pressure is reduced (e.g., 16 bar) when passing through the regulator 400.

[0079] The hydrogen supply device 500 is connected to the hydrogen supply line 24 and is provided between the regulator 400 and the fuel cell stack 550. The hydrogen supply device 500 adjusts the supply amount of the hydrogen supplied to the fuel cell stack 550. In addition, the supply of hydrogen to the fuel cell stack 550 can be selectively allowed or cut off through the hydrogen supply device 500.

[0080] Refer to Figure 3 and Figure 4 , the filling nozzle 600 is connected to the receiver 100, and hydrogen (filling fluid) H is supplied to the fuel cell electric vehicle 20 through the receiver 100.

[0081] For example, the filling nozzle 600 can supply hydrogen stored in a filling facility (not shown) at a hydrogen filling station to the fuel cell electric vehicle 20.

[0082] The filling nozzle 600 can have various structures that can be selectively and detachably connected to the receiver 100, and the present disclosure is not limited or restricted by the structure and shape of the filling nozzle 600.

[0083] For example, the filling nozzle 600 includes: a nozzle body 610 configured to be connected to the receiver 100; and a clamping unit 620 connected to the nozzle body 610 and configured to selectively restrain on the circumferential surface of the receiver 100.

[0084] The nozzle body 610 can be connected to the receiver 100 through a male-female coupling structure. In a state where the nozzle body 610 is connected to the receiver 100, the nozzle body 610 and the receiver 100 can communicate with each other, and hydrogen supplied through the interior of the nozzle body 610 can be introduced into the receiver 100.

[0085] The clamping unit 620 can have various structures capable of selectively restricting the state in which the nozzle body 610 and the receiver 100 are connected to each other. For example, the clamping unit 620 can include: a gripper 622 rotatably connected to the nozzle body 610 and configured to be supported on the circumferential surface of the receiver 100; and an elastic member 624 configured to elastically support the rotation of the gripper 622 relative to the nozzle body 610.

[0086] For example, a plurality of grippers 622 can be rotatably provided on the nozzle body 610 and spaced apart from each other in the circumferential direction (the circumferential direction of the receiver 100). When the grippers 622 rotate in a direction approaching or departing from the outer surface of the receiver 100 along the ends of the respective grippers 622, the state in which the filling nozzle 600 and the receiver 100 are connected to each other can be restricted or released.

[0087] In particular, a recessed receiving groove 102 can be formed in the circumferential surface of the receiver 100. When each gripper 622 rotates in a direction approaching the outer surface of the receiver 100 along each gripper 622, the end of each gripper 622 can be received in the receiving groove 102. As described above, the receiving groove 102 is formed in the circumferential surface of the receiver 100, and the end of the gripper 622 is received in the receiving groove 102, so that the restricted state formed by the gripper 622 can be stably maintained, thereby obtaining the beneficial effect of more reliably maintaining the state in which the filling nozzle 600 and the receiver 100 are connected to each other.

[0088] A conventional spring capable of elastically supporting the rotation of the gripper 622 relative to the nozzle body 610 can be used as the elastic member 624, and the present disclosure is not limited or restricted by the type and structure of the elastic member 624.

[0089] For example, the elastic member 624 can provide an elastic force such that the end of the gripper 622 rotates to approach (be restricted by) the outer surface of the receiver 100.

[0090] The operating structure of the gripper 622 can be variably changed according to the required conditions and design specifications. For example, when the operating lever 602 provided in the filling nozzle 600 is released, the plurality of grippers 622 rotate to be spaced apart from the outer surface of the receiver 100, so that the constraint of the gripper 622 on the receiver 100 can be released. On the other hand, when the operation of releasing the operating lever 602 is stopped, the gripper 622 can return to the initial position (the position where the gripper 622 rotates to be close to the outer surface of the receiver) by the elastic force of the elastic member 624.

[0091] The cover member 700 is provided to surround the filling nozzle 600 and the receiver 100.

[0092] The cover member 700 can have various structures capable of surrounding the filling nozzle 600 and the receiver 100, and the present disclosure is not limited or restricted by the structure and shape of the cover member 700.

[0093] As a reference, in the present disclosure, the configuration in which the cover member 700 surrounds the filling nozzle 600 and the receiver 100 is defined to include the configuration in which the cover member 700 surrounds the entire circumference of the filling nozzle 600 and the entire circumference of the receiver 100, and the configuration in which the cover member 700 surrounds a part of the circumference of the filling nozzle 600 and a part of the circumference of the receiver 100.

[0094] In particular, the cover member 700 has a hollow structure (for example, a hollow structure having a circular cross-sectional shape), and the hollow structure surrounds the entire coupling portion between the filling nozzle 600 and the receiver 100.

[0095] The fluid supply unit 800 is provided to supply an antifreeze fluid to the inside of the cover member 700 to inhibit freezing between the filling nozzle 600 and the receiver 100.

[0096] As described above, since the antifreeze fluid is supplied to the inside of the cover member 700, the connection portion (the periphery of the receiver) between the filling nozzle 600 and the receiver 100 can be heated, so that the beneficial effect of inhibiting the connection portion between the filling nozzle 600 and the receiver 100 from freezing due to the very low hydrogen filling temperature during the hydrogen filling process can be obtained.

[0097] Various types of gas-phase fluids or liquid-phase fluids capable of inhibiting freezing between the filling nozzle 600 and the receiver 100 can be used as the antifreeze fluid, and the present disclosure is not limited or restricted by the type and characteristics of the antifreeze fluid.

[0098] For example, air (for example, heated air) can be used as the antifreeze fluid.

[0099] The fluid supply unit 800 can have various structures capable of supplying the antifreeze fluid to the inside of the cover member 700.

[0100] For example, the fluid supply unit 800 includes an antifreeze fluid supply unit 810 configured to supply antifreeze fluid, and a heating unit 820 configured to heat the antifreeze fluid supplied from the antifreeze fluid supply unit 810 to the interior of the lid member 700 to a preset temperature.

[0101] The antifreeze fluid supply unit 810 is provided to supply air, and the present disclosure is not limited or restricted by the structure of the antifreeze fluid supply unit 810 and the method of supplying antifreeze fluid.

[0102] For example, an air compressor or an air storage tank capable of supplying compressed air can be used as the antifreeze fluid supply unit 810. According to another exemplary form of the present disclosure, a blower (e.g., a ring blower) or other air supply device can be used as the antifreeze fluid supply unit.

[0103] The antifreeze fluid supply unit 810 can be connected to the lid member 700 through a supply line 812, and the antifreeze fluid supplied from the antifreeze fluid supply unit 810 can be supplied to the interior of the lid member 700 through the supply line 812.

[0104] For example, a plurality of supply lines 812 can be connected to the lid member 700, and the antifreeze fluid can be supplied to the interior of the lid member 700 through the plurality of supply lines 812. The number of supply lines and the structure for connecting the supply lines can be variably changed according to required conditions and design specifications, and the present disclosure is not limited or restricted by the number of supply lines and the structure for connecting the supply lines.

[0105] The heating unit 820 is provided to heat the antifreeze fluid supplied from the antifreeze fluid supply unit 810 to the interior of the lid member 700 to a preset temperature.

[0106] A conventional heater or various heating devices capable of heating antifreeze fluid can be used as the heating unit 820, and the present disclosure is not limited or restricted by the structure of the heating unit 820 and the method of heating antifreeze fluid. In addition, the heating unit 820 can directly heat the antifreeze fluid or indirectly heat the antifreeze fluid through a separate heat transfer medium.

[0107] In particular, the heating unit 820 can heat the antifreeze fluid to a temperature that does not seriously affect the hydrogen supplied to the receiver 100 (i.e., a temperature that does not excessively increase the temperature of the supplied hydrogen).

[0108] According to an exemplary form of the present disclosure, a power-free heater can be used as the heating unit 820. For example, a conventional vortex tube can be used as the power-free heater.

[0109] As a reference, the vortex tube can be configured to introduce compressed air into a vortex chamber, forcefully and spirally rotate the compressed air, and then discharge the hot air to the hot air outlet of the vortex tube, and the present disclosure is not limited or restricted by the structure and shape of the vortex tube.

[0110] As described above, since the heating unit 820 is configured as a non-powered heater, the heating unit 820 can be freely installed (without restrictions when installing electrical facilities) in a hydrogen filling station designated as an explosion-proof area (i.e., an area where an explosion may occur and the use of electrical facilities is restricted). As a result, advantageous effects of improving safety and reliability can be obtained.

[0111] According to an exemplary form of the present disclosure, the fluid supply unit 800 may include a dehumidifying unit 830 configured to remove moisture from the antifreeze fluid supplied from the antifreeze fluid supply unit 810 to the inside of the lid member 700.

[0112] As described above, since moisture in the antifreeze fluid supplied to the inside of the lid member 700 is removed, beneficial effects of more effectively suppressing freezing of the connection portion between the filling nozzle 600 and the receiver 100 due to the very low hydrogen filling temperature during the hydrogen filling process can be obtained.

[0113] The dehumidifying unit 830 may have various structures capable of removing moisture from the antifreeze fluid supplied from the antifreeze fluid supply unit 810 to the inside of the lid member 700, and the present disclosure is not limited or restricted by the dehumidifying structure and dehumidifying method of the dehumidifying unit 830.

[0114] For example, the dehumidifying unit 830 may remove moisture contained in the air by heating the air in a conventional heating manner. According to another exemplary form of the present disclosure, moisture contained in the air may be removed by passing the air supplied from the antifreeze fluid supply unit through a filter.

[0115] Refer to Figure 2 , according to another exemplary form of the present disclosure, the antifreeze fluid supply unit 810 or the heating unit 820 may be configured to serve as the dehumidifying unit 830 without separately providing the dehumidifying unit 830.

[0116] For example, the antifreeze fluid supply unit 810 and the dehumidifying unit 830 may be provided as a first integrated module 802 that integrally integrates the antifreeze fluid supply unit 810 and the dehumidifying unit 830.

[0117] As another example, the heating unit 820 and the dehumidifying unit 830 may be provided as a second integrated module (not shown) that integrally integrates the heating unit 820 and the dehumidifying unit 830.

[0118] As described above, since the first integration module 802 (or the second integration module) serves to supply the antifreeze fluid and remove moisture from the antifreeze fluid, there is no need to separately provide the dehumidifying unit 830. As a result, beneficial effects such as a simplified structure, increased design freedom and space utilization, and reduced equipment manufacturing costs can be obtained.

[0119] According to another exemplary form of the present disclosure, the antifreeze fluid can be supplied to all positions inside the cover member 700 where freezing may occur.

[0120] For example, referring to Figure 5 , in the interior of the cover member 700, the following can be defined: a first flow path 710 into which the antifreeze fluid is introduced from the fluid supply unit 800; a second flow path 720 formed between the nozzle body 610 and the clamping unit 620 and communicating with the first flow path 710; a third flow path 730 formed between the cover member 700 and the clamping unit 620 and communicating with the first flow path 710; and a fourth flow path 740 formed between the receiver 100 and the cover member 700 and communicating with the second flow path 720 and the third flow path 730, so that the antifreeze fluid is discharged to the outside of the cover member 700 through the fourth flow path 740. The antifreeze fluid A supplied from the fluid supply unit 800 can sequentially pass through the first flow path 710 → the second flow path 720 → the fourth flow path 740, or sequentially pass through the first flow path 710 → the third flow path 730 → the fourth flow path 740. Additionally, the antifreeze fluid supplied from the fluid supply unit 800 can pass through the first flow path 710 → the second flow path 720 and the third flow path 730 → the fourth flow path 740.

[0121] Specifically, the front side of the first flow path 710 (the right end of the first flow path based on Figure 3 ) communicates with the second flow path 720 and the third flow path 730, the rear side of the first flow path 710 (the left end of the first flow path based on Figure 3 ) is covered and blocked by the cover member 700, and the antifreeze fluid supplied from the antifreeze fluid supply portion 810 is supplied into the interior of the first flow path 710 through the supply pipeline 812.

[0122] As described above, since the front side of the first flow path 710 is open and the rear side of the first flow path 710 is blocked, the antifreeze fluid supplied into the first flow path 710 through the supply pipeline 812 can be guided to the second flow path 720 and the third flow path 730 while preventing leakage to the rear side of the first flow path 710 (to the outside of the cover member). Therefore, beneficial effects such as reducing the usage amount of the antifreeze fluid and further improving the antifreeze efficiency of the antifreeze fluid can be obtained.

[0123] According to another exemplary form of the present disclosure, the antifreeze fluid supplied from the antifreeze fluid supply unit may be supplied through a supply pipeline to the inside of another flow path (a second flow path, a third flow path, or a fourth flow path) other than the first flow path.

[0124] According to an exemplary form of the present disclosure, the fluid filling system 10 may include a control unit 900 configured to selectively control at least one of the flow rate and temperature of the antifreeze fluid supplied to the inside of the lid member 700.

[0125] According to the filling environment and conditions, the control unit 900 may optimally control the flow rate and temperature of the antifreeze fluid supplied to the inside of the lid member 700.

[0126] As a reference, the control unit 900 may control the antifreeze fluid supply unit 810 to adjust the flow rate of the antifreeze fluid supplied to the inside of the lid member 700, and the control unit 900 may control the heating unit 820 to adjust the temperature of the antifreeze fluid supplied to the inside of the lid member 700.

[0127] For example, the control unit 900 may be a central processing unit (CPU) or a semiconductor device that processes instructions stored in a memory and / or a storage device. The memory and the storage device may include various types of volatile or non-volatile storage media. For example, the memory may include a read-only memory (ROM) and a random access memory (RAM).

[0128] In particular, the fluid filling system 10 may include a temperature sensor 910 configured to measure the temperature of the external air and a humidity sensor 920 configured to measure the humidity of the external air. The control unit 900 controls at least one of the flow rate and temperature of the antifreeze fluid based on the sensed values sensed by the temperature sensor 910 and the humidity sensor 920.

[0129] Conventional sensors capable of sensing the temperature and humidity of the external air may be used as the temperature sensor 910 and the humidity sensor 920, and the present disclosure is not limited or restricted by the structures of the temperature sensor 910 and the humidity sensor 920 and the manner of sensing the temperature and humidity of the external air.

[0130] For example, referring to Figure 6 , based on the conditions of the external air (the temperature and humidity of the external air) (sensed values) sensed by the temperature sensor 910 and the humidity sensor 920, the control unit 900 may control the flow rate and temperature of the antifreeze fluid supplied to the inside of the lid member 700 according to the operating conditions of the hydrogen filling station.

[0131] For example, the operating conditions of a hydrogen filling station can be classified into a pre - operation condition (e.g., late at night) where the hydrogen filling process is not carried out for a long time, a standby condition where the hydrogen filling process is not executed for a short period (e.g., the standby condition after filling the previous vehicle and before filling the next vehicle), a filling condition where the hydrogen filling process is being executed, and a post - filling condition immediately after the completion of the hydrogen filling process (e.g., the state where the filling nozzle is not separated). The control unit 900 can appropriately control the flow rate and temperature of the antifreeze fluid supplied to the interior of the lid member 700 according to each operating condition (pre - operation condition, standby condition, filling condition, and post - filling condition).

[0132] In particular, based on the conditions of the external air (temperature and humidity of the external air), the flow rate and temperature of the antifreeze fluid set according to the operating conditions of the hydrogen filling station can be pre - stored in a look - up table, so that the control unit 900 can quickly control the flow rate and temperature of the antifreeze fluid by using the information pre - stored in the look - up table.

[0133] Specifically, when measuring the temperature and humidity of the external air, control parameters related to the flow rate and temperature of the antifreeze fluid can be called.

[0134] In addition, control parameters not pre - stored in the look - up table can be calculated by using an interpolation method of the errors in the pre - stored adjacent control parameters.

[0135] According to an exemplary form of the present disclosure, the fluid filling system 10 may include at least one of a first hydrophobic coating 604 formed on the surface of at least one of the nozzle body 610 and the clamping unit 620, a second hydrophobic coating 104 formed on at least one of the outer surface and the inner surface of the receiver 100, and a third hydrophobic coating 704 formed on the inner surface of the lid member 700.

[0136] Here, the surface of at least one of the nozzle body 610 and the clamping unit 620 is defined to include at least one of the outer surface of the nozzle body 610 and the inner surface of the gripper 622.

[0137] For example, the first hydrophobic coating 604 may include a first outer hydrophobic coating 604a formed on the outer surface of the nozzle body 610 facing the inner surface of the lid member 700 and a first inner hydrophobic coating 604b formed on the inner surface of the gripper 622 facing the outer surface of the receiver 100 (the outer surface of the receiving groove).

[0138] In addition, the second hydrophobic coating 104 may include a second outer hydrophobic coating 104a formed on the outer surfaces of the inner surface of the receiver 100 facing the gripper 622 and the inner surface of the cover member 700, and a second inner hydrophobic coating 104b formed on the inner surface of the receiver 100 that houses the end of the nozzle body 610.

[0139] In addition, a third hydrophobic coating 704 may be formed on the inner surfaces of the outer surface of the cover member 700 facing the gripper 622 and the outer surface of the receiver 100.

[0140] The first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704 may be made of polymer-based materials such as polytetrafluoroethylene (PTFE), P, or PMMA, or various hydrophobic materials such as polydimethylsiloxane (PDMS), Pluronic (F127), and the present disclosure is not limited or restricted by the materials and properties of the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704.

[0141] In particular, materials for forming the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704 may be preferably selected considering hydrophobicity rather than durability.

[0142] For example, among "Material A" with high durability but low hydrophobicity and "Material B" with low durability but high hydrophobicity, "Material B" may be preferably selected as the material for forming the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704.

[0143] In addition, the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704 may be formed by dipping, doping, chemical vapor deposition, plasma treatment, or laser patterning (or surface reforming performed by machining), and the present disclosure is not limited or restricted by the methods for forming the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704.

[0144] For example, each of the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704 may be formed by a DLC (diamond-like carbon) coating.

[0145] In particular, the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704 may be provided by doping (mixing) fluorine (F) into DLC. For example, in the case of a film formed by doping approximately 30% of fluorine (F) into DLC, the hydrophobicity of the film surface (e.g., the droplet contact angle on the film surface) can be increased by approximately 15% (e.g., the droplet contact angle can change from 79.2 degrees to 90.5 degrees).

[0146] For reference, the DLC coating has a high hardness (e.g., 9H), excellent wear resistance and lubricity, and excellent non-adhesiveness (hydrophobicity), a low coefficient of friction (0.05), chemical resistance, low-temperature durability, heat resistance, and insulation. For example, the operating temperature at which the normal performance of the DLC coating can be maintained can be defined as -200°C to 260°C.

[0147] As another example, each of the first hydrophobic coating 604, the second hydrophobic coating 104, and the third hydrophobic coating 704 can be formed by an ultra-thin film glass coating (e.g., hydrophobic fluorine-based glass).

[0148] For reference, the ultra-thin film glass coating has a lower hardness (e.g., 2H), but has very high hydrophobicity. For example, the operating temperature at which the normal performance of the ultra-thin film glass coating can be maintained can be defined as -150°C to 150°C.

[0149] As described above, since the surfaces where freezing may occur (e.g., the outer surface of the nozzle body, the inner surface of the clamping unit, the inner or outer surface of the receiver, the inner surface of the cover member) are hydrophobically treated, the attachment of moisture contained in the air (e.g., the internal air of the cover member 700) (or moisture contained in the antifreeze fluid) to the surfaces where freezing may occur can be minimized. As a result, the beneficial effect of more effectively suppressing the freezing of the connection portion between the filling nozzle 600 and the receiver 100 can be obtained.

[0150] Meanwhile, Figure 7 is a view for explaining a nozzle device according to an exemplary form of the present disclosure. In addition, components that are the same as and equivalent to the components in the above-described configuration will be denoted by the same or equivalent reference numerals, and their detailed descriptions will be omitted.

[0151] Referring to Figure 7 , a nozzle device 600' according to an exemplary form of the present disclosure may include: a filling nozzle 600 configured to supply a filling fluid and arranged to be connected to a receiver 100 provided in an object; a cover member 700 arranged to surround the filling nozzle 600 and the receiver 100; and a fluid supply unit 800 configured to supply an antifreeze fluid for suppressing freezing between the filling nozzle 600 and the receiver 100 to the inside of the cover member 700.

[0152] For reference, Figure 7 shows an example in which the nozzle device 600' includes both the first hydrophobic coating 604 and the third hydrophobic coating 704. However, according to another exemplary form of the present disclosure, the first hydrophobic coating 604 and the third hydrophobic coating 704 may be excluded from the nozzle device 600'.

[0153] Return reference Figure 7 , according to another exemplary form of the present disclosure, the nozzle device 600' may include: a filling nozzle 600 configured to supply a filling fluid and arranged to be connected to a receiver 100 provided in an object (see Figure 3 ); and a first hydrophobic coating 604 formed on the surface of the filling nozzle 600.

[0154] In particular, the filling nozzle 600 may include: a nozzle body 610 arranged to be connected to the receiver 100; and a clamping unit 620 connected to the nozzle body 610 and configured to selectively engage with the circumferential surface of the receiver 100. The first hydrophobic coating 604 may be formed on the surface of at least one of the nozzle body 610 and the clamping unit 620 (e.g., the outer surface of the nozzle body and the inner surface of the gripper).

[0155] For reference, Figure 7 an example is shown in which the nozzle device 600' includes all the cover member 700, the fluid supply unit 800 and the third hydrophobic coating 704. However, according to another exemplary form of the present disclosure, the cover member 700, the fluid supply unit 800 and the third hydrophobic coating 704 may be excluded from the nozzle device 600'.

[0156] In addition, referring to Figure 7 , according to yet another exemplary form of the present disclosure, the nozzle device 600' may include: a filling nozzle 600 configured to supply a filling fluid and arranged to be connected to a receiver 100 provided in an object (see Figure 3 ); and a third hydrophobic coating 704 formed on the inner surface of the cover member 700.

[0157] For reference, Figure 7 an example is shown in which the nozzle device 600' includes both the fluid supply unit 800 and the first hydrophobic coating 604. However, according to another exemplary form of the present disclosure, the fluid supply unit 800 and the first hydrophobic coating 604 may be excluded from the nozzle device 600'.

[0158] Figure 8 is a view for illustrating a receiver device according to an exemplary form of the present disclosure. In addition, components that are the same as and equivalent to the components in the above-described configuration will be denoted by the same or equivalent reference numerals, and their detailed descriptions will be omitted.

[0159] Referring to Figure 8 , the receiver device 100' may include: a receiver 100 and a filling nozzle 600 configured to supply a filling fluid (see Figure 3) is connected to the receiver 100; and a second hydrophobic coating 104 is formed on at least one of the outer surface and the inner surface of the receiver 100.

[0160] For example, the second hydrophobic coating 104 may include a second-1 hydrophobic coating 104a formed on the outer surface of the receiver 100 and a second-2 hydrophobic coating 104b formed on the inner surface of the receiver 100.

[0161] Although the exemplary forms are described above, the exemplary forms are merely exemplary and are not intended to limit the present disclosure. Those skilled in the art will understand that various modifications and changes not described above can be made to the exemplary forms without departing from the essential features of the exemplary forms. For example, each of the constituent elements specifically described in the exemplary forms can be modified and then implemented. In addition, it should be construed that the differences related to the modifications and changes are included within the scope of the present disclosure defined by the appended claims.

[0162] According to the exemplary form of the present disclosure as described above, beneficial effects of suppressing freezing of the receiver connected to the filling nozzle and improving safety and reliability can be obtained.

[0163] In particular, according to the exemplary form of the present disclosure, beneficial effects of suppressing freezing of the receiver during the hydrogen filling process and easily and quickly separating the filling nozzle from the receiver after the hydrogen filling process is completed can be obtained.

[0164] In addition, according to the exemplary form of the present disclosure, beneficial effects of minimizing deterioration of durability and safety caused by freezing of the receiver can be obtained.

Claims

1. A nozzle device, comprising: A filling nozzle that supplies a filling fluid and is configured to be connected to a receiver provided in an object; A cover member that surrounds the filling nozzle and the receiver; And A fluid supply unit that supplies an antifreeze fluid for suppressing freezing between the filling nozzle and the receiver to the inside of the cover member, Wherein the filling nozzle includes: a nozzle body configured to be connected to the receiver; and a clamping unit connected to the nozzle body and selectively constrained on the circumferential surface of the receiver, The nozzle device further includes: A first flow path formed inside the cover member, and the antifreeze fluid is introduced into the first flow path from the fluid supply unit; A second flow path formed between the nozzle body and the clamping unit and communicating with the first flow path; A third flow path formed between the cover member and the clamping unit and communicating with the first flow path; and A fourth flow path formed between the receiver and the cover member and communicating with the second flow path and the third flow path, so that the antifreeze fluid is discharged to the outside of the cover member through the fourth flow path.

2. The nozzle device according to claim 1, wherein The fluid supply unit includes: An antifreeze fluid supply portion that supplies the antifreeze fluid; and A heating portion that heats the antifreeze fluid supplied from the antifreeze fluid supply portion to the inside of the cover member to a preset temperature.

3. The nozzle device according to claim 2, wherein The fluid supply unit includes a dehumidifying portion that removes moisture from the antifreeze fluid supplied from the antifreeze fluid supply portion to the inside of the cover member.

4. The nozzle device according to claim 3, wherein The antifreeze fluid supply portion and the dehumidifying portion are provided as an integrally integrated first integrated module.

5. The nozzle device according to claim 3, wherein The heating portion and the dehumidifying portion are provided as an integrally integrated second integrated module.

6. The nozzle device according to claim 2, further comprising: A control unit that selectively controls at least one of the flow rate and temperature of the antifreeze fluid supplied to the inside of the cover member.

7. The nozzle device according to claim 6, further comprising: A temperature sensor that measures the temperature of the external air; And A humidity sensor that measures the humidity of the external air, Wherein the control unit controls at least one of the flow rate and temperature of the antifreeze fluid based on the sensed values sensed by the temperature sensor and the humidity sensor.

8. The nozzle device according to claim 1, wherein The clamping unit includes: A clamp that is rotatably connected to the nozzle body and is supported on the circumferential surface of the receiver; and An elastic member that elastically supports the rotation of the clamp relative to the nozzle body.

9. The nozzle device according to claim 1, further comprising: A first hydrophobic coating formed on the surface of at least one of the nozzle body and the clamping unit.

10. The nozzle device according to claim 1, further comprising: An internal hydrophobic coating is formed on the inner surface of the lid member.

11. The nozzle device according to claim 1, wherein the filling fluid includes hydrogen.

12. The nozzle device according to claim 1, wherein the anti-freeze fluid includes air.

13. A nozzle device, comprising: a filling nozzle that supplies a filling fluid and is configured to be connected to a receiver provided in an object; and a first hydrophobic coating provided on the surface of the filling nozzle, the filling nozzle includes: a nozzle body configured to be connected to the receiver; and a clamping unit connected to the nozzle body and selectively constrained on the circumferential surface of the receiver, the nozzle device further includes: a first flow path formed inside the lid member of the nozzle device, and the anti-freeze fluid is introduced into the first flow path from a fluid supply unit of the nozzle device; a second flow path formed between the nozzle body and the clamping unit and communicating with the first flow path; a third flow path formed between the lid member and the clamping unit and communicating with the first flow path; and a fourth flow path formed between the receiver and the lid member and communicating with the second flow path and the third flow path, so that the anti-freeze fluid is discharged to the outside of the lid member through the fourth flow path.

14. The nozzle device according to claim 13, Among them, the first hydrophobic coating is formed on the surface of at least one of the nozzle body and the clamping unit.

15. A nozzle device, comprising: a filling nozzle that supplies a filling fluid and is configured to be connected to a receiver provided in an object; a lid member surrounding the filling nozzle and the receiver; and an internal hydrophobic coating formed on the inner surface of the lid member, the filling nozzle includes: a nozzle body configured to be connected to the receiver; and a clamping unit connected to the nozzle body and selectively constrained on the circumferential surface of the receiver, the nozzle device further includes: a first flow path formed inside the lid member, and the anti-freeze fluid is introduced into the first flow path from a fluid supply unit of the nozzle device; a second flow path formed between the nozzle body and the clamping unit and communicating with the first flow path; a third flow path formed between the lid member and the clamping unit and communicating with the first flow path; and a fourth flow path formed between the receiver and the lid member and communicating with the second flow path and the third flow path, so that the anti-freeze fluid is discharged to the outside of the lid member through the fourth flow path.

16. A receiver device, comprising: a receiver to which a filling nozzle of a nozzle device for supplying a filling fluid is connected; and a hydrophobic coating formed on at least one of the outer surface and the inner surface of the receiver, and the nozzle device is the nozzle device according to any one of claims 1-12.

17. A fluid filling system, comprising: a filling nozzle that supplies a filling fluid; a receiver provided in an object and the filling nozzle is connected to the receiver; a lid member configured to surround the filling nozzle and the receiver; and A fluid supply unit that supplies an antifreeze fluid for suppressing freezing between the filling nozzle and the receiver into the interior of the cover member. The filling nozzle includes: a nozzle body configured to be connected to the receiver; and a clamping unit connected to the nozzle body and selectively constrained to the circumferential surface of the receiver. The fluid filling system further includes: A first flow path formed inside the cover member, and the antifreeze fluid is introduced into the first flow path from the fluid supply unit. A second flow path formed between the nozzle body and the clamping unit and communicating with the first flow path. A third flow path formed between the cover member and the clamping unit and communicating with the first flow path; and A fourth flow path formed between the receiver and the cover member and communicating with the second flow path and the third flow path, so that the antifreeze fluid is discharged to the outside of the cover member through the fourth flow path.

18. A fluid filling system, comprising: A filling nozzle that supplies a filling fluid. A receiver disposed in an object and connected to the filling nozzle. A cover member configured to surround the filling nozzle and the receiver. A hydrophobic coating disposed on at least one of the surface of the filling nozzle, the surface of the receiver, and the inner surface of the cover member. And A fluid supply unit that supplies an antifreeze fluid for suppressing freezing between the filling nozzle and the receiver into the interior of the cover member. The filling nozzle includes: a nozzle body configured to be connected to the receiver; and a clamping unit connected to the nozzle body and selectively constrained to the circumferential surface of the receiver. The fluid filling system further includes: A first flow path formed inside the cover member, and the antifreeze fluid is introduced into the first flow path from the fluid supply unit. A second flow path formed between the nozzle body and the clamping unit and communicating with the first flow path. A third flow path formed between the cover member and the clamping unit and communicating with the first flow path; and A fourth flow path formed between the receiver and the cover member and communicating with the second flow path and the third flow path, so that the antifreeze fluid is discharged to the outside of the cover member through the fourth flow path.

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