A small-sized urea supply device for commercial vehicles

Abstract

The utility model discloses a kind of miniaturization vehicle urea supply device suitable for commercial vehicle vehicle-mounted scene, it is related to urea supply technical field, include box and pipe winder, both are communicated by flow guide pipe.Pipe winder is equipped with pipeline storage structure, is matched with guy and clamping block, through single winding drum double helical groove or double winding drum independent winding design, make guy bear pulling force, pipeline keep slack, avoid pipeline damage;Automatic winding is realized in pipe winder built-in torsion spring, guide wheel reduces friction loss.Box is equipped with liquid storage barrel, miniature diaphragm pump, and matching digital display control panel can set supply amount, display remaining amount and progress, also have heat preservation, shockproof, vehicle-mounted power supply and USB emergency charging function.The device is adapted to commercial vehicle, convenient to operate, environmental adaptability is strong, can efficiently solve long-distance freight vehicle urea emergency supply problem, guarantee driving safety and freight efficiency.

Description

Technical Field

[0001] This utility model relates to the field of urea replenishment technology, and more specifically, it relates to a miniaturized vehicle urea replenishment device suitable for commercial vehicle onboard scenarios. Background Technology

[0002] Long-haul freight vehicles need to regularly replenish urea to meet exhaust gas treatment requirements. Existing emergency urea replenishment devices mostly rely on directly pulling the pipes to extend and retract them. When operators pull the pipes to connect to the urea tank, the pipes must directly bear the entire pulling force. However, urea delivery pipes are mostly food-grade flexible hoses, which are thin and have limited tensile strength. Long-term or excessive pulling can easily lead to pipe breakage and deformation, which not only affects the stability of urea delivery but also requires frequent pipe replacement, increasing operating costs.

[0003] Therefore, in order to solve the above-mentioned technical problems, this utility model proposes a miniaturized vehicle urea replenishment device suitable for commercial vehicle in-vehicle scenarios. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a miniaturized vehicle urea replenishment device suitable for commercial vehicle in-vehicle scenarios.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a miniaturized vehicle urea replenishment device suitable for commercial vehicle on-board scenarios, comprising a housing and a hose reel, wherein the housing and the hose reel are connected by a guide pipe, and a pipe is wound around the hose reel, the pipe being connected to the housing through the hose reel; The hose reel is also equipped with a pull wire, which is wound around the hose reel. One end of the pull wire is connected to a locking block, which is located on the pipe and can be locked onto the hose reel. The pull wire is in a taut state, and the pipe is in a slack state.

[0006] Furthermore, the hose reel includes a second reel, which is covered by a housing. The second reel is rotatably connected to the housing via a bracket and connected to the housing via a torsion spring. A pipe is wound around the second reel, and the pipe communicates with the housing through the second reel. A guide hole is provided on the housing for the pipe to pass through, and the pipe extends to the outside of the housing through the guide hole.

[0007] Furthermore, the pull cord is wound around the second drum, and the pull cord extends to the outside of the outer casing through the wire hole; this is the first solution, where both the pull cord and the pipe are wound around the second drum. The pull cord is taut, and when the stop is pulled, the pull cord bears the tension, which will drive the pull cord and the pipe to move outward, thereby driving the second drum to compress the torsion spring and rotate. The manual pulling force and the rebound force of the torsion spring both act on the pull cord, thereby avoiding the pipe from bearing the pulling force and protecting the pipe; when released, the torque of the torsion spring restoring its deformation will drive the second drum to rotate, winding up the pull cord and the pipe.

[0008] Furthermore, the hose reel also includes a first drum, which is fixedly connected to a second drum. A pull cord is wound around the first drum. This is the second solution: the pipe is wound around the second drum, and the pull cord is wound around the first drum. Since the second drum and the first drum are fixedly connected by bolts, when the pull cord pulls the first drum to rotate, the second drum will also rotate, thereby releasing the pipe. At this time, as long as a traction force is applied to the pipe by the clamp, the pipe can be released to the outside. The manual pulling force and the rebound force of the torsion spring both act on the pull cord, thereby avoiding the pipe from bearing the pulling force and protecting the pipe. When released, the torque of the torsion spring restoring its deformation will drive the second drum and the first drum to rotate, winding up the pull cord and the pipe.

[0009] Furthermore, a guide wheel is provided on the guide hole, and the guide wheel contacts the pull wire and the pipe; reducing the pulling force when the pull wire and the pipe are pulled.

[0010] Furthermore, the second drum has a channel inside, and each end of the second drum corresponding to the channel has a connector, one of which is connected to the guide pipe, and the other of which is connected to the pipeline.

[0011] Compared with the prior art, the present invention has the following beneficial effects: By optimizing the structure of the hose reel and adopting a separate winding and unwinding method with tension on the cable and relaxation of the hose, the hose is protected from tensile forces. At the same time, the guide wheel converts sliding friction into rolling friction, further solving the problems of easy breakage, deformation and wear of hoses in existing technologies. This significantly extends the service life of hoses and reduces the cost of use. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a three-dimensional cross-sectional structural diagram of the outer shell of this utility model; Figure 3 This is a front cross-sectional view of the outer shell of this utility model.

[0013] 1. Outer shell; 2. First drum; 3. Second drum; 4. Pipe; 5. Pull wire; 6. Torsion spring; 7. Guide hole; 8. Locking block; 9. Bracket; 10. Box; 11. Guide pipe. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0016] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0019] like Figure 1-3 As shown, this utility model provides a miniaturized vehicle urea refueling device suitable for commercial vehicle applications. It comprises two core components: a housing 10 and a hose reel. These two components are stably connected via a guide pipe 11, ensuring smooth urea flow between the housing 10 and the hose reel. The hose reel, a key component for the storage and release of the pipe 4, has a pipe 4 wound around its surface for transporting urea. One end of the pipe 4 is connected to the housing 10 through an internal channel structure within the hose reel, while the other end is used for refueling.

[0020] To prevent damage to pipe 4 during the pulling process, a pull line 5 is specially installed on the hose reel. The pull line 5 is wound around the hose reel together with pipe 4, and one end of the pull line 5 is fixedly connected to a clamp 8. The clamp 8 is directly installed near the end of pipe 4. The clamp 8 can be stably locked on the hose reel. When the device is not in use, the pull line 5 is always taut to support pipe 4, while pipe 4 is in a naturally relaxed state to avoid deformation due to its own tension or slight external contact.

[0021] The core structure of the hose reel includes a second drum 3, which is encased in a housing 1. The housing 1 not only protects the internal components such as the second drum 3 and torsion spring 6 from external environmental factors like dust and rain, but also provides a safe gripping and operating space for the operator. The second drum 3 is rotatably connected to the housing 1 via a bracket 9. The bracket 9 is bolted to preset mounting positions on both sides of the inside of the housing 1. A cylindrical shaft is located in the middle of the bracket 9, and the second drum 3 has a shaft hole in its center that matches the shaft. The second drum 3 is fitted onto the outside of the shaft and can rotate freely around the axis of the bracket 9, ensuring smooth release and rewinding of the pipe 4 and the cable 5. To achieve the automatic winding function of the second drum 3, the second drum 3 is also connected to the outer shell 1 via a torsion spring 6. The torsion spring 6 is a spiral structure made of metal. One end of the spring is fixed in a pre-set fixing groove on the inner wall of the outer shell 1 by a hook. The depth of the fixing groove is matched with the length of the hook to ensure that one end of the torsion spring 6 will not fall off. The other end of the torsion spring 6 is fixed to the edge of the end face of the second drum 3 by welding or bolting. In the initial state, the torsion spring 6 is in a natural deformation state. At this time, the pipe 4 and the pull wire 5 on the second drum 3 are in a fully retracted state. When the second drum 3 rotates under the action of external force, it will drive the torsion spring 6 to undergo elastic deformation. The torsion spring 6 stores elastic potential energy. After the external force disappears, the elastic potential energy is converted into kinetic energy, driving the second drum 3 to rotate in the opposite direction to achieve automatic winding. The pipe 4 wound on the second reel 3 is a food-grade hose, which is resistant to urea corrosion and prevents urea from being contaminated or the pipe 4 from being corroded and damaged during transportation. One end of the pipe 4 is connected to the channel inside the second reel 3 through a connector, and the other end extends to the outside of the outer shell 1 through the guide hole 7 on the outer shell 1. The guide hole 7 is opened on the side of the outer shell 1 near the bottom, and the edge of the hole is rounded to prevent the pipe 4 from being scratched by the sharp edge when passing through.

[0022] In the first implementation scheme, the pull wire 5 and the pipe 4 are wound together on the second drum 3. To prevent them from tangling and interfering with each other during the winding process, two parallel spiral grooves are provided on the outer surface of the second drum 3. The pipe 4 and the pull wire 5 are embedded in different spiral grooves, wound in parallel. The depth and width of the spiral grooves are adapted to the diameters of the pipe 4 and the pull wire 5, respectively, to ensure that they do not detach from the grooves during the winding process. To allow the pull wire 5 to extend smoothly to the outside of the outer casing 1, a wire hole can be provided on the outer casing 1. The wire hole and the guide hole 7 are spaced apart. The size of the wire hole is slightly larger than the diameter of the pull wire 5 to ensure that the pull wire 5 can pass through smoothly. The edges of the hole are also rounded to reduce frictional wear between the pull wire 5 and the hole wall. In actual use of this scheme, when a long-haul freight vehicle needs to refill urea, the operator first holds the clamp 8 and pulls the clamp 8 away from the hose reel. The clamp 8 drives the pull wire 5 to move outward. At this time, the pull wire 5 bears all the tension. Since the pull wire 5 is made of high-strength nylon material, it has high tensile strength and will not break easily. The tension is transmitted to the second drum 3 via the pull wire 5, driving the second drum 3 to rotate around the axis of the bracket 9. Simultaneously, the torsion spring 6 is compressed, causing it to elastically deform. During the rotation of the second drum 3, the pipe 4 wound within its spiral groove is released outwards. The operator can adjust the release length of the pipe 4 according to the position of the commercial vehicle's urea tank until the special connector at the end of the pipe 4 can be connected to the urea tank interface. During this process, because both the manually applied tension and the rebound force generated by the torsion spring 6 act entirely on the pull wire 5, the pipe 4 remains in a relaxed state, naturally extending with the movement of the pull wire 5 without bearing any tensile force. This effectively prevents damage such as breakage or deformation of the pipe 4 due to excessive tension. Once the urea supply is complete, the operator releases the locking block 8. At this time, the torque generated by the torsion spring 6 returning to its original deformation will drive the second drum 3 to rotate in the opposite direction. During the rotation of the second drum 3, the spiral groove on its surface drives the pipe 4 and the pull wire 5 to be wound up synchronously. The pipe 4 and the pull wire 5 are neatly wound up along the spiral groove without any messy tangling, until the pull wire 5 returns to a taut state. The locking block 8 then re-locks into the slot in the outer shell 1 of the hose reel, and the device returns to normal.

[0023] In the second implementation scheme, to further optimize the independent operation of the pull wire 5 and the pipe 4, the hose reel is additionally equipped with a first reel 2. The first reel 2 has a similar structure to the second reel 3, and the two are fixedly connected by bolts. The bolts run through the axis of the first reel 2 and the second reel 3, with one end passing through the center hole of the first reel 2 and the other end passing through the center hole of the second reel 3, and then tightened with a nut. This ensures a tight connection between the first reel 2 and the second reel 3, preventing relative slippage during rotation and achieving synchronous rotation. In this scheme, the pull wire 5 is specifically wound on the first reel 2, and the outer surface of the first reel 2 also has a spiral groove adapted to the diameter of the pull wire 5, ensuring orderly winding of the pull wire 5. The pipe 4 is wound on the second reel 3, and the spiral groove of the second reel 3 is adapted to the diameter of the pipe 4. The two are independently wound on different reels, completely avoiding the problem of interference between the pipe 4 and the pull wire 5. When using this solution, the operator applies traction by pulling the locking block 8. The locking block 8 moves the pull line 5 outward, which in turn pulls the first drum 2 to rotate around the axis of the bracket 9. Since the first drum 2 and the second drum 3 are fixedly connected by bolts, the rotation of the first drum 2 will drive the second drum 3 to rotate synchronously. During the rotation of the second drum 3, the pipe 4 wound on it is released, and the operator can easily connect the special connector at the end of the pipe 4 to the urea tank interface of the commercial vehicle. In this process, the manually applied pulling force is transmitted to the first drum 2 through the pull line 5, and then to the second drum 3 through the first drum 2. The rebound force of the torsion spring 6 is transmitted to the first drum 2 through the second drum 3, and finally acts on the pull line 5. Throughout the entire force transmission process, the pipe 4 does not bear any tensile force and is only responsible for the delivery of urea, further improving the service life of the pipe 4. When the resupply operation is completed, the operator releases the spring 6, and the torque of the spring 6 returning to its original deformation first drives the second drum 3 to rotate. The second drum 3 drives the first drum 2 to rotate synchronously. When the first drum 2 rotates, it winds up the pull line 5, and when the second drum 3 rotates, it winds up the pipe 4. The two work synchronously until the pull line 5 is taut and the pipe 4 is completely retracted. The locking block 8 is locked on the pipe winder, and the device returns to its initial state.

[0024] To further reduce frictional loss between the pull wire 5 and the pipe 4 during movement, a guide wheel is provided on the guide hole 7. The guide wheel is a circular wheel made of rubber, with an annular groove on its outer surface. The size of the groove is adapted to the diameter of the pull wire 5 and the pipe 4, ensuring that the pull wire 5 and the pipe 4 can be embedded in the groove and preventing them from deviating from the track during movement. The guide wheel is mounted on a mounting base on the inner wall of the guide hole 7 via a rotating shaft. The mounting base is a block-shaped structure made of metal and is fixed to the inner wall of the outer shell 1 on both sides of the guide hole 7 by bolts. The rotating shaft is a cylindrical structure made of metal, with both ends fixed to the mounting base. The guide wheel is sleeved on the outside of the rotating shaft, and a small bearing is provided between the guide wheel and the rotating shaft to ensure that the guide wheel can rotate flexibly without jamming. When the pull wire 5 and the pipe 4 move within the guide hole 7, they will cause the guide wheel to rotate, converting the original sliding friction into rolling friction. This significantly reduces the coefficient of friction, effectively reducing the friction force experienced by the pull wire 5 and the pipe 4 during the pulling process. This not only allows operators to pull the pull wire 5 and the pipe 4 more easily, but also avoids problems such as wear on the pull wire 5 and damage to the outer wall of the pipe 4 caused by friction, further protecting the pull wire 5 and the pipe 4 and extending the service life of the entire device.

[0025] To ensure smooth flow of urea between the tank 10 and the pipe 4, a channel is specially provided inside the second reel 3. This channel runs along the axis of the second reel 3 and penetrates the reel. The inner wall of the channel is smoothed to reduce resistance during urea flow. Connectors are provided at both ends of the second reel 3 corresponding to the channel. These connectors are threaded metal connectors with good sealing and corrosion resistance. The connectors are fixed to the end face of the second reel 3 via threads, and a rubber sealing ring is provided at the connection point between the connector and the channel to ensure that urea does not leak from the connection. One connector is connected to the guide pipe 11, with one end threaded to the connector and the other end extending into the tank 10 to connect to the outlet of the storage tank. The other connector is directly connected to the pipe 4, with one end of the pipe 4 fitted onto this connector and secured with a clamp to ensure a tight connection. With this structural design, the urea in the storage tank inside the box 10 can enter the pipe 4 in sequence through the guide pipe 11, one of the joints on the second drum 3, the channel, and the other joint. Finally, it is transported to the commercial vehicle urea tank through the special joint at the end of the pipe 4. The entire transportation path is leak-free and unblocked, ensuring efficient urea replenishment.

[0026] The outer casing 1 of the device is made entirely of lightweight engineering plastic. This material has a low density, making the device lightweight and easy for operators to handle and place on vehicles. Engineering plastic also has good impact resistance, able to withstand minor collisions during vehicle travel. The overall size of the device is comparable to a common vehicle toolbox; its length, width, and height are all suitable for storage space in the driver's cab or trunk, without taking up too much space, making it convenient for long-haul freight vehicles. The housing 10, as the core component for liquid storage and control, contains a 5L food-grade liquid storage tank. The tank is made of polyethylene, meeting food-grade safety standards and will not chemically react with urea, ensuring the purity of the urea remains unaffected. The 5L capacity meets the emergency resupply needs of long-haul freight vehicles without making the device too heavy due to excessive capacity. To meet the needs of use in cold regions, the outside of the storage tank is wrapped with insulating cotton made of polyurethane foam. The insulating cotton is of uniform thickness and is tightly fitted to the tank body. It is secured with glue or straps and will not easily fall off. The insulating cotton can effectively insulate against the low temperature outside and reduce the heat exchange between the urea inside the storage tank and the external environment. Even in sub-zero temperatures, it can prevent the urea inside the storage tank from freezing, avoiding blockage of pipes or rupture of the storage tank due to freezing, and ensuring that the device can be used normally under different temperature conditions.

[0027] The power core of the supply system is a miniature diaphragm pump, which is installed inside the housing 10 near the outlet of the liquid storage tank. It is fixed to the mounting bracket 9 at the bottom of the housing 10 by bolts. The mounting bracket 9 is made of metal and can provide stable support for the miniature diaphragm pump, preventing the miniature diaphragm pump from shifting due to vehicle bumps. The pump inlet of the miniature diaphragm pump is connected to the outlet of the storage tank via a hose. A one-way valve is installed at the connection to prevent urea from flowing back into the storage tank when the pump stops working. The pump outlet is connected to a retractable filling hose and a special connector via a tee connector. The retractable filling hose has a multi-layer structure, with a food-grade inner layer and a wear-resistant rubber outer layer. It can be stretched and retracted for convenient use between urea tanks at different distances. The special connector is designed according to the specifications of urea tank interfaces in mainstream commercial vehicles and includes various adapter structures such as threaded and snap-fit ​​types. Operators can select the corresponding connector according to the actual urea tank interface type. After the connector is connected to the urea tank interface, a sealing ring is used to achieve a seal, ensuring that urea will not leak during the refueling process.

[0028] To enhance the ease of operation and intelligence of the device, it is also equipped with a digital display control panel. This control panel is installed on the front of the outer wall of the housing 10, and features a high-definition LCD screen with clear display content that is easily readable even in bright sunlight. The control panel has multiple buttons, including a power button, a setting button, an increase button, a decrease button, and a confirmation button. Operators can set the single replenishment volume using these buttons, with a setting range of 1-5L. Each press of the increase or decrease button adjusts the replenishment volume in 0.5L increments, meeting the replenishment needs of different vehicle models' urea tanks. Simultaneously, the digital display control panel can also display the remaining urea level in the storage tank in real time. Data collected by the liquid level sensor in the storage tank is displayed digitally, allowing operators to clearly understand the urea reserve status. Furthermore, the replenishment progress is also displayed in real time on the control panel as a percentage, gradually changing from 0% to 100%. Operators can judge whether replenishment is complete based on the progress, avoiding over- or under-replenishment.

[0029] Considering the bumps and vibrations that occur during long-haul freight vehicle travel, the bottom of the device is specially equipped with a shock-absorbing pad. Made of rubber, the pad offers excellent elasticity and shock absorption. Its area matches the bottom area of ​​the device, completely covering it and secured to the bottom of the housing 10 with adhesive, preventing displacement during bumpy rides. When the vehicle travels on rough roads, the shock-absorbing pad effectively absorbs vibration energy, reducing the impact on internal components such as the liquid storage tank, micro diaphragm pump, and digital control panel within the housing 10. This prevents components from loosening or becoming damaged due to prolonged vibration, ensuring stable operation of the device even under complex road conditions.

[0030] To meet the power supply requirements of the device and the emergency charging needs of operators, the top of the device is equipped with a vehicle cigarette lighter power supply interface and a USB charging port. The vehicle cigarette lighter power supply interface is a standard 12V interface with a dust cover. When not in use, the dust cover should be closed to prevent dust from entering. This interface is connected to the power module inside the housing 10 via a wire. The power module converts the voltage provided by the vehicle cigarette lighter into the operating voltage required by the various components of the device, powering components such as the miniature diaphragm pump and digital display control panel to ensure normal operation. The USB charging port is a standard USB-A interface, also with a dust cover. It is connected to the power module via a wire and can provide a 5V / 2A output current. During long-distance travel, operators can connect mobile devices such as mobile phones to the USB charging port for emergency charging via a data cable, avoiding situations where the phone runs out of power and cannot contact the outside world. This addresses the dual needs of powering the device and providing emergency charging for mobile phones.

[0031] In summary, this emergency urea replenishment device, through its reasonable structural design, achieves convenient and safe urea replenishment while also considering ease of operation, environmental adaptability, and multifunctionality. It can provide a stable and reliable emergency urea replenishment solution for long-haul freight vehicles during operation, effectively solving the problem of difficulty in quickly replenishing urea when long-haul freight vehicles are short of urea, thereby improving freight efficiency and driving safety.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A miniaturized vehicle urea replenishment device suitable for commercial vehicle applications, comprising a housing (10) and a hose reel, wherein the housing (10) and the hose reel are connected by a guide pipe (11), and a pipe (4) is wound around the hose reel, the pipe (4) being connected to the housing (10) through the hose reel, characterized in that: The hose reel is also provided with a pull wire (5), which is wound around the hose reel. One end of the pull wire (5) is connected to a locking block (8), which is set on the pipe (4). The locking block (8) can be locked on the hose reel. The pull wire (5) is in a taut state, and the pipe (4) is in a slack state.

2. The miniaturized vehicle urea replenishment device suitable for commercial vehicle applications according to claim 1, characterized in that: The hose reel includes a second reel (3), which is covered by a shell (1). The second reel (3) is rotatably connected to the shell (1) via a bracket (9). The second reel (3) is connected to the shell (1) via a torsion spring (6). A pipe (4) is wound around the second reel (3). The pipe (4) is connected to the housing (10) via the second reel (3). The shell (1) has a guide hole (7) for the pipe (4) to pass through. The pipe (4) extends to the outside of the shell (1) through the guide hole (7).

3. A miniaturized vehicle urea replenishment device suitable for commercial vehicle applications according to claim 2, characterized in that: The pull wire (5) is wound around the second spool (3) and extends through the wire hole to the outside of the housing (1).

4. A miniaturized vehicle urea replenishment device suitable for commercial vehicle applications according to claim 2, characterized in that: The hose reel also includes a first reel (2), which is fixedly connected to a second reel (3), and a pull wire (5) is wound on the first reel (2).

5. A miniaturized vehicle urea replenishment device suitable for commercial vehicle applications according to claim 2, characterized in that: A guide wheel is provided on the guide hole (7), and the guide wheel is in contact with the pull wire (5) and the pipe (4).

6. A miniaturized vehicle urea replenishment device suitable for commercial vehicle applications according to claim 2, characterized in that: The second drum (3) has a channel inside, and the two ends of the channel on the second drum (3) are provided with connectors. One of the connectors is connected to the guide pipe (11), and the other connector is connected to the pipe (4).

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