Urea conveying device, engine and engineering machinery

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a urea conveying device, an engine and engineering machinery, the urea conveying device comprises a urea pump, a urea sensor, a urea box body, a liquid inlet pipeline and a liquid return pipeline; a urea cavity channel is formed in the urea pump; the urea sensor is detachably connected with the urea pump through a fastener; the urea box body is connected with the urea sensor and is used for containing a urea solution; the liquid inlet pipeline is connected to the urea sensor, the first end of the liquid inlet pipeline is communicated with the urea cavity channel, and the second end of the liquid inlet pipeline extends to the bottom end of the urea box body; the liquid return pipeline is connected to the urea sensor, the first end of the liquid return pipeline is communicated with the urea cavity channel, and the second end of the liquid return pipeline extends to the top end of the urea box body. According to the urea conveying device provided by the utility model, the urea sensor is detachably connected with the urea pump through the fastener in a threaded manner, so that the urea conveying device is convenient to disassemble and assemble, and great convenience is brought to after-sales maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a urea conveying device, an engine and engineering machinery. Background Art

[0002] In the engine aftertreatment system, a urea aqueous solution is usually required to react with NOx (nitrogen oxides) in the exhaust gas discharged by the engine in the aftertreatment device to generate harmless gas. The urea delivery device is used to deliver the urea aqueous solution used in the reaction to the aftertreatment device to react with NOx.

[0003] The urea delivery device includes a urea pump, a urea sensor and a urea box. The urea pump is connected to the urea sensor installed on the urea box through a pipeline. The urea pump and the urea box are arranged in a distributed manner, so that the urea delivery device requires a certain space and position to arrange the scattered parts. In order to reduce costs and meet the compact layout of customers, the urea pump and urea sensor of some urea delivery devices in the related art are integrated and cannot be disassembled, which brings many inconveniences to after-sales maintenance. Utility Model Content

[0004] In view of this, the utility model provides a urea delivery device, an engine and an engineering machine to solve the problem that the urea pump and the urea sensor are integrated into one and cannot be disassembled, which brings many inconveniences to after-sales maintenance.

[0005] In a first aspect, the utility model provides a urea delivery device, comprising a urea pump, a urea sensor, a urea tank, a liquid inlet pipeline and a liquid return pipeline; a urea cavity is provided inside the urea pump; the urea sensor is detachably connected to the urea pump through a fastener; the urea tank is connected to the urea sensor and is used to hold a urea solution; the liquid inlet pipeline is connected to the urea sensor, a first end of the liquid inlet pipeline is communicated with the urea cavity, and a second end of the liquid inlet pipeline is extended to the bottom end of the urea tank; the liquid return pipeline is connected to the urea sensor, a first end of the liquid return pipeline is communicated with the urea cavity, and a second end of the liquid return pipeline is extended to the top end of the urea tank.

[0006] Beneficial effects: The urea sensor is detachably connected to the urea pump through fasteners, which can not only arrange the urea sensor, urea pump and urea tank in an integrated manner to meet the compact layout requirements of the urea delivery device; the urea delivery device can also be detachably connected through fasteners, which is convenient for repeated disassembly and assembly, bringing many conveniences to after-sales maintenance.

[0007] In an optional embodiment, the urea pump is provided with a first plug-in groove, the groove opening of the first plug-in groove faces the urea sensor, the bottom of the first plug-in groove is provided with a first connecting port connected to the urea cavity, and the first end of the liquid inlet pipeline is sealed and plugged in the first plug-in groove.

[0008] Beneficial effect: The setting of the first plug-in groove can facilitate the connection between the urea cavity and the first end of the liquid inlet pipeline. During the installation of the urea pump and the urea sensor, the cooperation between the first end of the liquid inlet pipeline and the first plug-in groove also plays a certain positioning role. The first end of the liquid inlet pipeline is sealed and plugged into the first plug-in groove, which can achieve a sealed connection between the liquid inlet pipeline and the urea cavity to prevent leakage of the urea solution.

[0009] In an optional implementation, it also includes:

[0010] A first sealing ring, which is sleeved on the outer circumference of the first end of the liquid inlet pipeline and is interference-fitted with the first plug-in groove;

[0011] The first cushion block is sleeved on the outer periphery of the first end of the liquid inlet pipeline and is located between the bottom of the first plug-in groove and the first sealing ring.

[0012] Beneficial effect: The first pad can not only press the first sealing ring to prevent the first sealing ring from being dislocated, curled or moved, but also guide the plugging between the first end of the liquid inlet pipeline and the first plugging groove. The first sealing ring and the first plugging groove have an interference fit, which can achieve a sealed connection between the first end of the liquid inlet pipeline and the first plugging groove.

[0013] In an optional embodiment, the urea pump is provided with a second plug-in groove, the groove opening of the second plug-in groove faces the urea sensor, the bottom of the second plug-in groove is provided with a second connecting port connected to the urea cavity, and the first end of the return liquid pipeline is sealed and plugged into the second plug-in groove.

[0014] Beneficial effect: The second plug-in groove is provided to facilitate the connection between the urea cavity and the first end of the return liquid pipeline. During the installation of the urea pump and the urea sensor, the cooperation between the first end of the return liquid pipeline and the second plug-in groove also plays a certain positioning role. The first end of the return liquid pipeline is sealed and plugged into the second plug-in groove, which can realize the sealed connection between the return liquid pipeline and the urea cavity and prevent the leakage of the urea solution.

[0015] In an optional implementation, it also includes:

[0016] A second sealing ring is sleeved on the outer circumference of the first end of the liquid return pipeline and is interference fit with the second plug-in groove;

[0017] The second cushion block is sleeved on the outer periphery of the first end of the liquid return pipeline and is located between the bottom of the second plug-in groove and the second sealing ring.

[0018] Beneficial effect: The second pad can not only press the second sealing ring to prevent the second sealing ring from being dislocated, curled or moved, but also guide the plugging between the first end of the return liquid pipeline and the second plugging groove. The second sealing ring and the second plugging groove have an interference fit, which can achieve a sealed connection between the first end of the return liquid pipeline and the second plugging groove.

[0019] In an optional embodiment, a cooling cavity is further provided inside the urea pump; the urea delivery device also includes a cooling pipeline, the cooling pipeline is connected to the urea sensor, a part of the cooling pipeline is used to extend in the urea solution, a liquid inlet of the cooling pipeline is communicated with the cooling cavity, and a liquid outlet of the cooling pipeline is communicated with the cooling cavity.

[0020] In an optional implementation, the urea pump is provided with:

[0021] a third plug-in slot, wherein the slot opening of the third plug-in slot faces the urea sensor, a third communication port communicating with the cooling cavity is provided on the slot bottom of the third plug-in slot, and the liquid inlet is sealed and plugged into the third plug-in slot;

[0022] A fourth plug-in slot, wherein the slot opening of the fourth plug-in slot faces the urea sensor, a fourth communication port communicating with the cooling cavity is provided on the slot bottom of the fourth plug-in slot, and the liquid outlet is sealed and plugged into the fourth plug-in slot.

[0023] In an optional implementation, it also includes:

[0024] A third sealing ring is sleeved on the outer periphery of the liquid inlet and is interference-fitted with the third plug-in groove;

[0025] The third cushion block is sleeved on the outer periphery of the liquid inlet and is located between the bottom of the third plug-in groove and the third sealing ring.

[0026] In an optional implementation, it also includes:

[0027] A fourth sealing ring, which is sleeved on the outer periphery of the liquid outlet and is interference-fitted with the fourth plug-in groove;

[0028] The fourth cushion block is sleeved on the outer periphery of the liquid outlet and is located between the bottom of the fourth plug-in groove and the fourth sealing ring.

[0029] In a second aspect, the utility model further provides an engine, comprising the above-mentioned urea delivery device.

[0030] In a third aspect, the utility model further provides an engineering machinery, comprising the above-mentioned urea delivery device, or the above-mentioned engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is an exploded view of the installation of a urea delivery device according to an embodiment of the utility model;

[0033] Figure 2 for Figure 1 A is a partial enlarged schematic diagram of the middle part.

[0034] Description of reference numerals:

[0035] 1. Urea pump; 101. First plug-in slot; 102. Second plug-in slot; 103. Third plug-in slot; 104. Fourth plug-in slot; 2. Urea sensor; 3. Fastener; 4. Urea tank; 5. Liquid inlet pipeline; 6. Liquid return pipeline; 7. First sealing ring; 8. First cushion block; 801. First guide part; 9. Second sealing ring; 10. Second cushion block; 11. Cooling pipeline; 12. Third sealing ring; 13. Third cushion block; 14. Fourth sealing ring; 15. Fourth cushion block; 100. Urea solution. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0037] Combine the following Figure 1 to Figure 2 , describing an embodiment of the utility model.

[0038] According to an embodiment of the utility model, on the one hand, a urea delivery device is provided, including a urea pump 1, a urea sensor 2, a urea tank 4, a liquid inlet pipeline 5 and a liquid return pipeline 6; a urea cavity is provided inside the urea pump 1; the urea sensor 2 is detachably connected to the urea pump 1 through a fastener 3; the urea tank 4 is connected to the urea sensor 2 and is used to hold a urea solution 100; the liquid inlet pipeline 5 is connected to the urea sensor 2, a first end of the liquid inlet pipeline 5 is communicated with the urea cavity, and a second end of the liquid inlet pipeline 5 is extended to the bottom end of the urea tank 4; the liquid return pipeline 6 is connected to the urea sensor 2, a first end of the liquid return pipeline 6 is communicated with the urea cavity, and a second end of the liquid return pipeline 6 is extended to the top end of the urea tank 4.

[0039] The urea sensor 2 is detachably connected to the urea pump 1 through the fastener 3, so that the urea sensor 2, the urea pump 1 and the urea tank 4 can be arranged in an integrated manner to meet the compact arrangement requirements of the urea delivery device; and the urea delivery device can be detachably connected through the fastener 3, which is convenient for repeated disassembly and assembly, bringing many conveniences to after-sales maintenance.

[0040] The working principle of the urea delivery device is as follows: when the urea delivery device is working, the urea pump 1 sucks the urea solution 100 contained in the urea box 4 into the urea cavity through the liquid inlet pipeline 5, and delivers it to the urea nozzle through the urea cavity for injection, so as to react with NOx (nitrogen oxides) in the exhaust gas discharged by the engine in the post-processor to generate harmless gas. When the urea delivery device stops working, the urea solution 100 remaining in the urea cavity of the urea pump 1 can be returned to the urea solution 100 through the liquid return pipeline 6. The urea sensor 2 can detect the liquid level of the urea solution 100 in the urea box 4, or the urea sensor 2 can detect the liquid level and concentration of the urea solution 100 in the urea box 4. The second end of the liquid inlet pipeline 5 is extended at the bottom end of the urea box 4, which can ensure that the liquid inlet pipeline 5 is inserted into the urea solution 100 to facilitate the absorption of the urea solution 100. The second end of the liquid return pipe 6 is extended to the top of the urea tank 4, so that the second end of the liquid return pipe 6 is not inserted into the urea solution 100 most of the time, thereby ensuring the liquid return effect.

[0041] In a preferred embodiment, the second end of the liquid inlet pipeline 5 has a tilted liquid inlet port, which increases the liquid inlet area of ​​the liquid inlet pipeline 5; when the second end of the liquid inlet pipeline 5 abuts against the bottom of the urea tank 4, the liquid inlet port is prevented from being closed by the bottom of the urea tank 4. The second end of the liquid return pipeline 6 has a tilted liquid return port, which increases the liquid return area of ​​the liquid return pipeline 6.

[0042] In a specific embodiment, the urea sensor 2 is detachably threadedly connected to the urea pump 1 through a fastener 3; a threaded hole is provided on the urea pump 1, and a through hole is provided on the urea sensor 2. The fastener 3 is a bolt or a screw, and a nut is provided at one end of the bolt or the screw, and the other end passes through the through hole and is threadedly connected to the threaded hole. There may be at least three threaded holes, which are distributed circumferentially around the bottom of the urea pump 1, and the number and position of the through holes correspond to the number and position of the threaded holes. An integrated urea injection device and a urea injection system in the related art, the urea pump 1 and the urea sensor 2 are connected by a buckle, which is not easy to disassemble, and is easy to fail during repeated disassembly and assembly. In this embodiment, the urea sensor 2 is detachably threadedly connected to the urea pump 1 by a fastener 3 such as a screw or a bolt, which is convenient for disassembly and installation, and is not easy to fail during repeated disassembly and installation. The urea sensor 2 and the urea box 4 can be detachably clamped by a buckle.

[0043] In one embodiment, a first plug-in groove 101 is provided on the urea pump 1 , the groove opening of the first plug-in groove 101 faces the urea sensor 2 , a first connecting port connected to the urea cavity is provided on the bottom of the first plug-in groove 101 , and the first end of the liquid inlet pipeline 5 is sealed and plugged into the first plug-in groove 101 .

[0044] The first plug-in groove 101 is provided to facilitate the connection between the urea cavity and the first end of the liquid inlet pipeline 5. During the installation of the urea pump 1 and the urea sensor 2, the cooperation between the first end of the liquid inlet pipeline 5 and the first plug-in groove 101 also plays a certain positioning role. The first end of the liquid inlet pipeline 5 is sealed and plugged into the first plug-in groove 101, which can achieve a sealed connection between the liquid inlet pipeline 5 and the urea cavity to prevent leakage of the urea solution 100.

[0045] In one embodiment, the urea delivery device further includes a first sealing ring 7 and a first cushion block 8; the first sealing ring 7 is sleeved on the outer periphery of the first end of the liquid inlet pipeline 5 and is interference fit with the first plug-in groove 101; the first cushion block 8 is sleeved on the outer periphery of the first end of the liquid inlet pipeline 5 and is located between the bottom of the first plug-in groove 101 and the first sealing ring 7.

[0046] The first cushion block 8 can not only press the first sealing ring 7 to prevent the first sealing ring 7 from being dislocated, curled or moved, but also guide the plugging between the first end of the liquid inlet pipeline 5 and the first plugging groove 101. The first sealing ring 7 and the first plugging groove 101 are interference fit, so that the first end of the liquid inlet pipeline 5 and the first plugging groove 101 can be sealed.

[0047] In a specific embodiment, a first guide portion 801 is provided on the top of the first cushion block 8, and the outer diameter of the first guide portion 801 gradually decreases in the direction away from the urea tank 4, and the first guide portion 801 can guide the plugging between the first end of the liquid inlet pipeline 5 and the first plug-in groove 101. Preferably, the first guide portion 801 is in a frustum shape. The first cushion block 8 can be an injection-molded hard tubular structure, and the first sealing ring 7 is made of an elastic material.

[0048] In one embodiment, a second plug-in groove 102 is provided on the urea pump 1 , the groove opening of the second plug-in groove 102 faces the urea sensor 2 , a second connecting port connected to the urea cavity is provided on the bottom of the second plug-in groove 102 , and the first end of the return liquid pipeline 6 is sealed and plugged into the second plug-in groove 102 .

[0049] The second plug-in groove 102 is provided to facilitate the connection between the urea cavity and the first end of the liquid return pipe 6. During the installation of the urea pump 1 and the urea sensor 2, the cooperation between the first end of the liquid return pipe 6 and the second plug-in groove 102 also plays a certain positioning role. The first end of the liquid return pipe 6 is sealed and plugged into the second plug-in groove 102, which can realize the sealed connection between the liquid return pipe 6 and the urea cavity and prevent the leakage of the urea solution 100.

[0050] In one embodiment, it also includes a second sealing ring 9 and a second gasket 10; the second sealing ring 9 is sleeved on the outer periphery of the first end of the return liquid pipeline 6 and has an interference fit with the second plug-in groove 102; the second gasket 10 is sleeved on the outer periphery of the first end of the return liquid pipeline 6 and is located between the bottom of the second plug-in groove 102 and the second sealing ring 9.

[0051] The second cushion block 10 can not only press the second sealing ring 9 to prevent the second sealing ring 9 from being displaced, curled or moved, but also guide the plugging between the first end of the return liquid pipeline 6 and the second plugging groove 102. The second sealing ring 9 and the second plugging groove 102 are interference fit, so that the first end of the return liquid pipeline 6 and the second plugging groove 102 can be sealed.

[0052] In a specific embodiment, a second guide portion is provided on the top of the second cushion block 10, and the outer diameter of the second guide portion gradually decreases in the direction away from the urea tank 4, and the second guide portion can guide the plugging between the first end of the return liquid pipeline 6 and the second plugging groove 102. Preferably, the second guide portion is in a frustum shape. The second cushion block 10 can be an injection-molded hard tubular structure, and the second sealing ring 9 is made of an elastic material.

[0053] In one embodiment, a cooling cavity is further provided inside the urea pump 1; the urea delivery device further includes a cooling pipeline 11, the cooling pipeline 11 is connected to the urea sensor 2, a part of the cooling pipeline 11 is used to extend in the urea solution 100, a liquid inlet of the cooling pipeline 11 is communicated with the cooling cavity, and a liquid outlet of the cooling pipeline 11 is communicated with the cooling cavity.

[0054] The cooling cavity and the cooling pipeline 11 are used to contain antifreeze liquid. The antifreeze liquid in the cooling cavity can defrost the urea solution 100 remaining in the urea cavity in the urea pump 1, and the antifreeze liquid in the cooling pipeline 11 can defrost the urea solution 100 in the urea tank 4. The cooling cavity is connected to an external antifreeze liquid supply device, and the cooling pipeline 11 and the cooling cavity can realize the circulation of the antifreeze liquid in the urea tank 4 and the urea pump 1.

[0055] In one embodiment, a third plug-in slot 103 and a fourth plug-in slot 104 are provided on the urea pump 1; the slot opening of the third plug-in slot 103 faces the urea sensor 2, and a third connecting port communicating with the cooling cavity is provided on the bottom of the third plug-in slot 103, and the liquid inlet is sealably plugged in the third plug-in slot 103; the slot opening of the fourth plug-in slot 104 faces the urea sensor 2, and a fourth connecting port communicating with the cooling cavity is provided on the bottom of the fourth plug-in slot 104, and the liquid outlet is sealably plugged in the fourth plug-in slot 104.

[0056] The third plug-in slot 103 is provided to facilitate the connection between the cooling cavity and the liquid inlet. During the installation of the urea pump 1 and the urea sensor 2, the cooperation between the liquid inlet of the cooling pipeline 11 and the third plug-in slot 103 also plays a certain positioning role. The liquid inlet is sealed and plugged into the third plug-in slot 103, which can achieve a sealed connection between the cooling pipeline 11 and the cooling cavity to prevent leakage of the refrigerant. The fourth plug-in slot 104 is provided to facilitate the connection between the cooling cavity and the liquid outlet. During the installation of the urea pump 1 and the urea sensor 2, the cooperation between the liquid outlet of the cooling pipeline 11 and the fourth plug-in slot 104 also plays a certain positioning role. The liquid outlet is sealed and plugged into the fourth plug-in slot 104, which can achieve a sealed connection between the cooling pipeline 11 and the cooling cavity to prevent leakage of the refrigerant.

[0057] In one embodiment, the urea delivery device further includes a third sealing ring 12 and a third gasket 13; the third sealing ring 12 is sleeved on the outer periphery of the liquid inlet and has an interference fit with the third plug-in groove 103; the third gasket 13 is sleeved on the outer periphery of the liquid inlet and is located between the bottom of the third plug-in groove 103 and the third sealing ring 12.

[0058] The third gasket 13 can not only press the third sealing ring 12 to prevent the third sealing ring 12 from being displaced, curled or moved, but also guide the plugging between the liquid inlet of the cooling pipeline 11 and the third plugging groove 103. The third sealing ring 12 and the third plugging groove 103 are interference fit, so that the liquid inlet of the cooling pipeline 11 and the third plugging groove 103 can be sealed.

[0059] In a specific embodiment, a third guide portion is provided on the top of the third cushion block 13, and the outer diameter of the third guide portion gradually decreases in the direction away from the urea tank 4, and the third guide portion can guide the plugging between the liquid inlet of the cooling pipeline 11 and the third plugging groove 103. Preferably, the third guide portion is in a frustum shape. The third cushion block 13 can be an injection-molded hard tubular structure, and the third sealing ring 12 is made of an elastic material.

[0060] In one embodiment, it also includes a fourth sealing ring 14 and a fourth gasket 15; the fourth sealing ring 14 is sleeved on the outer periphery of the liquid outlet and has an interference fit with the fourth plug-in groove 104; the fourth gasket 15 is sleeved on the outer periphery of the liquid outlet and is located between the bottom of the fourth plug-in groove 104 and the fourth sealing ring 14.

[0061] The fourth gasket 15 can not only press the fourth sealing ring 14 to prevent the fourth sealing ring 14 from being displaced, curled or moved, but also guide the plugging between the liquid outlet of the cooling pipeline 11 and the fourth plugging groove 104. The fourth sealing ring 14 and the fourth plugging groove 104 are interference fit, so that the liquid outlet of the cooling pipeline 11 and the fourth plugging groove 104 can be sealed.

[0062] In a specific embodiment, a fourth guide portion is provided on the top of the fourth cushion block 15, and the outer diameter of the fourth guide portion gradually decreases in the direction away from the urea tank 4, and the fourth guide portion can guide the plugging between the liquid outlet of the cooling pipeline 11 and the fourth plugging groove 104. Preferably, the fourth guide portion is in a frustum shape. The fourth cushion block 15 can be an injection-molded hard tubular structure, and the fourth sealing ring 14 is made of an elastic material.

[0063] According to an embodiment of the present utility model, on the other hand, an engine is provided, comprising the above-mentioned urea delivery device.

[0064] According to an embodiment of the present utility model, on another aspect, a construction machine is provided, comprising the above-mentioned urea delivery device or the above-mentioned engine.

[0065] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A urea delivery device, characterized in that: include: A urea pump (1) is provided with a urea cavity therein; A urea sensor (2) is detachably connected to the urea pump (1) via a fastener (3); a urea tank (4), connected to the urea sensor (2) and used for containing urea solution (100); A liquid inlet pipeline (5) is connected to the urea sensor (2), a first end of the liquid inlet pipeline (5) is communicated with the urea cavity, and a second end of the liquid inlet pipeline (5) is extended to the bottom end of the urea tank (4); A liquid return line (6) is connected to the urea sensor (2), a first end of the liquid return line (6) is in communication with the urea cavity, and a second end of the liquid return line (6) is extended to the top of the urea tank (4).

2. The urea delivery device according to claim 1, characterized in that: The urea pump (1) is provided with a first plug-in groove (101), the notch of the first plug-in groove (101) faces the urea sensor (2), a first communication port communicating with the urea cavity is provided on the bottom of the first plug-in groove (101), and the first end of the liquid inlet pipeline (5) is sealed and plugged into the first plug-in groove (101).

3. The urea delivery device according to claim 2, characterized in that: Also includes: A first sealing ring (7) is sleeved on the outer periphery of the first end of the liquid inlet pipeline (5) and is interference-fitted with the first plug-in groove (101); The first cushion block (8) is sleeved on the outer periphery of the first end of the liquid inlet pipeline (5) and is located between the bottom of the first plug-in groove (101) and the first sealing ring (7).

4. The urea delivery device according to any one of claims 1 to 3, characterized in that: The urea pump (1) is provided with a second plug-in groove (102), the notch of the second plug-in groove (102) faces the urea sensor (2), a second communication port communicating with the urea cavity is provided on the bottom of the second plug-in groove (102), and the first end of the liquid return pipe (6) is sealed and plugged into the second plug-in groove (102).

5. The urea delivery device according to claim 4, characterized in that: Also includes: A second sealing ring (9) is sleeved on the outer periphery of the first end of the liquid return pipeline (6) and is interference-fitted with the second plug-in groove (102); The second cushion block (10) is sleeved on the outer periphery of the first end of the liquid return pipeline (6) and is located between the bottom of the second plug-in groove (102) and the second sealing ring (9).

6. The urea delivery device according to any one of claims 1 to 3 or 5, characterized in that: A cooling cavity is further provided inside the urea pump (1); the urea delivery device further comprises a cooling pipeline (11), the cooling pipeline (11) is connected to the urea sensor (2), a portion of the cooling pipeline (11) is used to extend into the urea solution (100), a liquid inlet of the cooling pipeline (11) is communicated with the cooling cavity, and a liquid outlet of the cooling pipeline (11) is communicated with the cooling cavity.

7. The urea delivery device according to claim 6, characterized in that: The urea pump (1) is provided with: a third plug-in slot (103), the slot opening of the third plug-in slot (103) facing the urea sensor (2), a third communication port communicating with the cooling cavity being provided on the bottom of the third plug-in slot (103), and the liquid inlet being sealed and plugged into the third plug-in slot (103); A fourth plug-in slot (104), the slot opening of the fourth plug-in slot (104) faces the urea sensor (2), a fourth communication port communicating with the cooling cavity is provided on the bottom of the fourth plug-in slot (104), and the liquid outlet is sealed and plugged into the fourth plug-in slot (104).

8. The urea delivery device according to claim 7, characterized in that: Also includes: A third sealing ring (12) is sleeved on the outer periphery of the liquid inlet and is interference-fitted with the third plug-in groove (103); A third pad (13) is sleeved on the outer periphery of the liquid inlet and is located between the bottom of the third plug-in slot (103) and the third sealing ring (12); and / or, also include: A fourth sealing ring (14) is sleeved on the outer periphery of the liquid outlet and is interference-fitted with the fourth plug-in groove (104); The fourth pad (15) is sleeved on the outer periphery of the liquid outlet and is located between the bottom of the fourth plug-in slot (104) and the fourth sealing ring (14).

9. An engine, characterized in that: The urea delivery device comprises the urea delivery device according to any one of claims 1 to 8.

10. An engineering machine, characterized in that: The invention comprises the urea delivery device according to any one of claims 1 to 8, or the engine according to claim 9.

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