Urea filling gun

Abstract

The utility model provides a urea filling gun which comprises a hollow gun body, one end of the gun body is connected with a liquid inlet pipe, the other end of the gun body is connected with a filling pipe, the interior of the gun body is divided into a liquid inlet cavity and a liquid outlet cavity through a separation layer, a shell is arranged at the upper end of the outer side of the gun body, an electromagnet is arranged in the shell, and the middle of the separation layer is a parallel layer. A sealing groove is formed in the upper side of the parallel layer; a through hole is formed in the bottom of the sealing groove; a magnetic attraction piece is movably arranged above the sealing groove, a rubber sealing layer is arranged on the lower side of the magnetic attraction piece, a connecting shaft penetrating through the through hole is downwards arranged on the magnetic attraction piece, a limiting sleeve in sliding connection with the connecting shaft is upwards arranged at the bottom in the gun body, and a supporting disc is arranged at the position, above the limiting sleeve, of the connecting shaft; a reset spring is arranged between the supporting disc and the parallel layer, and a capacitive liquid level sensor is arranged on the outer side of the free end of the filling pipe. According to the utility model, a lighter and smaller electronic device is adopted to realize automatic stopping of liquid adding, the volume is reduced, and the weight is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of urea filling, and relates to a urea filling gun. Background Technique

[0002] With the continuous enhancement of environmental protection awareness and the increasingly strict relevant regulations, selective catalytic reduction technology (SCR), as an effective means to reduce the exhaust emissions of diesel engines, has been widely applied. In this technology, urea solution (also known as diesel exhaust fluid, DEF) is used as an important reducing agent and is injected into the exhaust system of a diesel engine, and nitrogen oxides are converted into harmless nitrogen and water vapor through chemical reactions. Therefore, the filling of urea solution has become one of the key links to maintain the normal operation of diesel engines.

[0003] Existing urea filling guns are usually modified based on the design principle of traditional fuel filling guns. However, traditional fuel filling guns use a relatively complex mechanical structure to achieve the function of automatically stopping liquid filling. The realization of this function mainly detects the airflow change inside the fuel tank. When the fuel tank is full, the change in airflow will trigger the closing mechanism inside the fuel filling gun to automatically stop the fuel filling process. Although this design can effectively prevent liquid overflow, due to its complex mechanical structure, the urea filling gun is large in volume and heavy in weight, which not only increases the burden on the operator. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a urea filling gun, which uses more portable and compact electronic devices to achieve automatic stop of liquid filling, reduces its volume and weight, and can effectively reduce the burden on the operator.

[0005] To solve the above technical problems, the utility model provides a urea filling gun, which includes a hollow gun body. One end of the gun body is connected with a liquid inlet pipe, and the other end of the gun body is connected with a filling pipe. The interior of the gun body is divided into a liquid inlet cavity communicated with the liquid inlet pipe and a liquid outlet cavity communicated with the filling pipe by a partition layer. An electromagnet is arranged inside a housing provided at the upper end of the outer side of the gun body. The middle part of the partition layer is a parallel layer parallel to the housing. A sealing groove is opened on one side of the parallel layer facing the housing, and a through hole penetrating the parallel layer is opened at the bottom of the sealing groove;

[0006] Above the sealing groove, a magnetic sheet capable of being attracted by the electromagnet is movably arranged. A rubber sealing layer matching the sealing groove is arranged on the lower side of the magnetic sheet. The magnetic sheet is provided with a connecting shaft extending downward through the through hole. The outer diameter of the connecting shaft is smaller than the inner diameter of the through hole. A limiting sleeve slidably connected to the connecting shaft is arranged upward at the bottom in the gun body. A support disk is arranged above the limiting sleeve on the connecting shaft. A return spring sleeving the connecting shaft is arranged between the support disk and the parallel layer;

[0007] A capacitive liquid level sensor is arranged on the outer side of the free end of the filling pipe. An inlet liquid groove arranged along its length direction is inwardly opened at one end of the capacitive liquid level sensor facing the free end of the filling pipe. Two electrode plates of the capacitive liquid level sensor are respectively arranged on opposite sides of the inlet liquid groove. Liquid outlet openings communicating with the inlet liquid groove are opened on both sides of one end of the capacitive liquid level sensor far from the free end of the filling pipe. A control button for controlling the electromagnet is arranged on one side of the inlet pipe.

[0008] By adopting the above technical solution, when filling urea solution, the electromagnet is started, and the electromagnet is energized to generate magnetism to suck up the magnetic sheet upward, so that the connecting shaft pulls the support disk upward to compress the return spring. After the rubber sealing layer moves upward, the through hole is opened, the inlet liquid cavity is communicated with the outlet liquid cavity, and the urea solution then enters the storage cavity from the inlet pipe through the inlet liquid cavity and is finally filled into the urea tank from the filling pipe;

[0009] When the urea solution in the urea tank is filled up, the solution enters the inlet liquid groove, and the medium changes from air to urea solution, resulting in a change in the capacitance detected by the capacitive liquid level sensor. It can be judged that the solution is filled up, and the electromagnet is controlled to be powered off to lose magnetism. Under the action of the return spring, the support disk is pushed to pull the connecting shaft downward, pulling the magnetic sheet and the rubber sealing layer downward to block the through hole, and quickly stopping the liquid filling.

[0010] The present utility model is further arranged such that the control button is arranged on the outer side of the handle sleeve.

[0011] The present utility model is further arranged such that a gunstock is connected between the lower end of the gun body and the free end of the handle sleeve, and the control button is arranged on one side of the handle sleeve close to the gunstock.

[0012] The present utility model is further arranged such that an integrated circuit board is arranged in the housing. The capacitive liquid level sensor is connected with a fixed cable line connecting the filling pipe and the housing. The capacitive liquid level sensor is electrically connected to the integrated circuit board through the fixed cable line. Both the electromagnet and the control button are electrically connected to the integrated circuit board.

[0013] Compared with the prior art, the utility model has the following beneficial effects: The utility model adopts a more compact and lightweight electromagnet in cooperation with a capacitive liquid level sensor to automatically stop liquid filling when the urea solution is full, making the mechanism inside the gun simpler, the overall volume smaller, and the weight lighter, which can effectively reduce the burden on the operator. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 is a partial cross-sectional view for showing the internal structure of the utility model;

[0016] Figure 3 is a partial cross-sectional view for showing the internal structure of the gun body;

[0017] Figure 4 is used to show the liquid inlet groove on the capacitive liquid level sensor.

[0018] Among them, 1. Gun body; 2. Liquid inlet pipe; 3. Filling pipe; 4. Handle sleeve; 5. Gun stock; 6. Partition layer; 7. Liquid inlet cavity; 8. Liquid outlet cavity; 9. Shell; 10. Electromagnet; 11. Parallel layer; 12. Sealing groove; 13. Through hole; 14. Magnetic attraction piece; 15. Rubber sealing layer; 16. Connecting shaft; 17. Limit sleeve; 18. Support disc; 19. Return spring; 20. Capacitive liquid level sensor; 21. Liquid inlet groove; 22. Electrode plate; 23. Liquid outlet; 24. Control button; 25. Integrated circuit board; 26. Fixed cable. Detailed Description of the Preferred Embodiment

[0019] The following further describes in detail a urea filling gun proposed by the utility model in conjunction with the drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the drawings represent the same or similar components.

[0020] Embodiment, referring to Figures 1-4, a urea filling gun, including a hollow gun body 1. One end of the gun body 1 is connected to a liquid inlet pipe 2, and the other end of the gun body 1 is connected to a filling pipe 3. A handle sleeve 4 is sleeved outside the liquid inlet pipe 2. A gunstock 5 is connected between the lower end of the gun body 1 and the free end of the handle sleeve 4. The interior of the gun body 1 is divided into a liquid inlet cavity 7 communicating with the liquid inlet pipe 2 and a liquid outlet cavity 8 communicating with the filling pipe 3 by a partition layer 6. At the upper end of the outside of the gun body 1, a housing 9 is provided. An electromagnet 10 is arranged inside the housing 9. The middle part of the partition layer 6 is a parallel layer 11 parallel to the housing 9. A sealing groove 12 is opened on one side of the parallel layer 11 facing the housing 9. A through hole 13 penetrating the parallel layer 11 is opened at the bottom of the sealing groove 12.

[0021] Above the sealing groove 12, a magnetic attraction piece 14 capable of being attracted by the electromagnet 10 is movably arranged. A rubber sealing layer 15 matching the sealing groove 12 is arranged on the lower side of the magnetic attraction piece 14. A connecting shaft 16 passing through the through hole 13 is arranged downward on the magnetic attraction piece 14. The outer diameter of the connecting shaft 16 is smaller than the inner diameter of the through hole 13. After the electromagnet 10 attracts the magnetic attraction piece 14 to open the through hole 13, the liquid inlet cavity 7 communicates with the liquid outlet cavity 8. A limiting sleeve 17 slidably connected with the connecting shaft 16 is arranged upward at the bottom inside the gun body 1. A support disk 18 is arranged above the limiting sleeve 17 on the connecting shaft 16. A return spring 19 sleeving the connecting shaft 16 is arranged between the support disk 18 and the parallel layer 11.

[0022] A capacitive liquid level sensor 20 is arranged outside the free end of the filling pipe 3. An inlet liquid groove 21 arranged along its length direction is opened inward at one end of the capacitive liquid level sensor 20 facing the free end of the filling pipe 3. Two electrode plates 22 of the capacitive liquid level sensor 20 are respectively arranged on opposite sides of the inlet liquid groove 21. Liquid outlet ports 23 communicating with the inlet liquid groove 21 are opened on both sides of one end of the capacitive liquid level sensor 20 far from the free end of the filling pipe 3. When a solution enters the inlet liquid groove 21, the medium between the two electrode plates 22 changes, resulting in a change in the capacitance detected by the capacitive liquid level sensor 20, and it can be judged that the solution is full. A control button 24 for controlling the electromagnet 10 is arranged on one side of the handle sleeve 4 close to the gunstock 5.

[0023] An integrated circuit board 25 is arranged inside the housing 9. The capacitive liquid level sensor 20 is connected with a fixed cable 26 connected to the housing 9 along the filling pipe 3. The capacitive liquid level sensor 20 is electrically connected to the integrated circuit board 25 through the fixed cable. Both the electromagnet 10 and the control button 24 are electrically connected to the integrated circuit board 25.

[0024] Working principle: When filling the urea solution, the electromagnet 10 is activated. When the electromagnet 10 is energized, it generates magnetism to suck up the magnetic sheet 14 upward, causing the connecting shaft 16 to pull the support plate 18 upward to compress the return spring 19. After the rubber sealing layer 15 moves upward, the through hole 13 is opened, and the liquid inlet chamber 7 is communicated with the liquid outlet chamber 8. Then the urea solution enters the storage chamber from the liquid inlet pipe 2 through the liquid inlet chamber 7 and is finally filled into the urea tank through the filling pipe 3;

[0025] When the urea solution in the urea tank is full, the solution enters the liquid inlet groove 21, and the medium in the right air becomes urea solution, resulting in a change in the capacitance detected by the capacitive liquid level sensor 20. It can be determined that the solution is full, and the electromagnet 10 is controlled to be powered off and lose magnetism. Under the action of the return spring 19, the support plate 18 is pushed to pull the connecting shaft 16 downward, pulling the magnetic sheet 14 and the rubber sealing layer 15 downward to block the through hole 13, and the liquid filling is quickly stopped.

[0026] It should be noted that the various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0027] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the field of the present invention according to the above disclosure are within the protection scope of the claims.

Claims

1. A urea filling gun, comprising a hollow gun body (1), one end of the gun body (1) is connected to a liquid inlet pipe (2), and the other end of the gun body (1) is connected to a filling pipe (3), characterized in that: The gun body (1) is divided into a liquid inlet chamber (7) connected to the liquid inlet pipe (2) and a liquid outlet chamber (8) connected to the filling pipe (3) by a partition layer (6); a shell (9) is arranged at the upper end of the outer side of the gun body (1); an electromagnet (10) is arranged in the shell (9); the middle part of the partition layer (6) is a parallel layer (11) parallel to the shell (9); a sealing groove (12) is provided on one side of the parallel layer (11) facing the shell (9); a through hole (13) penetrating the parallel layer (11) is provided at the bottom of the sealing groove (12); A magnetic attraction sheet (14) capable of being attracted by the electromagnet (10) is movably arranged above the sealing groove (12); a rubber sealing layer (15) matching the sealing groove (12) is arranged on the lower side of the magnetic attraction sheet (14); a connecting shaft (16) passing through the through hole (13) is arranged downwardly on the magnetic attraction sheet (14); the outer diameter of the connecting shaft (16) is smaller than the inner diameter of the through hole (13); a limiting sleeve (17) slidably connected to the connecting shaft (16) is arranged upwardly at the bottom of the gun body (1); a supporting plate (18) is arranged above the limiting sleeve (17) of the connecting shaft (16); a return spring (19) covering the connecting shaft (16) is arranged between the supporting plate (18) and the parallel layer (11); A capacitive liquid level sensor (20) is arranged on the outer side of the free end of the filling pipe (3); a liquid inlet groove (21) arranged along the length direction of the capacitive liquid level sensor (20) is provided inwardly at one end of the capacitive liquid level sensor (20) facing the free end of the filling pipe (3); two electrode sheets (22) of the capacitive liquid level sensor (20) are respectively arranged on two opposite sides of the liquid inlet groove (21); liquid outlets (23) connected to the liquid inlet groove (21) are provided on both sides of one end of the capacitive liquid level sensor (20) away from the free end of the filling pipe (3); and a control button (24) for controlling the electromagnet (10) is arranged on one side of the liquid inlet pipe (2).

2. A urea filling gun according to claim 1, characterized in that: The liquid inlet pipe (2) is covered with a handle sleeve (4), and the control button (24) is arranged on the outside of the handle sleeve (4).

3. A urea filling gun according to claim 2, characterized in that: A buttstock (5) is connected between the lower end of the gun body (1) and the free end of the handle sleeve (4), and the control button (24) is arranged on a side of the handle sleeve (4) close to the buttstock (5).

4. A urea filling gun according to claim 1, characterized in that: An integrated circuit board (25) is arranged in the housing (9), and the capacitive liquid level sensor (20) is connected to a fixed cable (26) connected to the housing (9) along the filling pipe (3). The capacitive liquid level sensor (20) is electrically connected to the integrated circuit board (25) via the fixed cable (26), and the electromagnet (10) and the control button (24) are both electrically connected to the integrated circuit board (25).

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