Urea sensor convenient for unfreezing liquid channel

Abstract

The utility model is suitable for the technical field of urea sensors, and provides a urea sensor convenient for unfreezing a liquid channel, which comprises a head shell, a conveying mechanism and an operating mechanism which are arranged at the upper part of the head shell, and a circulating mechanism arranged at the lower part of the head shell, the head shell comprises an upper shell, a lower shell and a head water cavity, wherein the upper shell and the lower shell are connected into a whole, and the head water cavity is formed in the lower shell. The conveying mechanism comprises a water inlet nozzle and a water outlet nozzle which are installed on the side wall of the upper shell, and a water inlet pipeline and a water outlet pipeline which are arranged in the upper shell. The circulating mechanism comprises a circulating water pipe penetrating through the lower shell, a water inlet connector and a water outlet connector. The device solves the problem that normal operation of an automobile engine is affected due to the fact that urea crystals at the head of a urea sensor and in a urea barrel need to be unfrozen for a long time under the low-temperature condition, and the effects that a water cavity wrapping pipeline is arranged at the head, and urea in a urea liquid pipeline and the urea barrel is rapidly unfrozen at the same time through hot unfreezing liquid are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of urea sensors, and more specifically relates to a urea sensor which is convenient for thawing a liquid channel. Background Art

[0002] Urea sensor is a sensor used to detect and measure the urea level in a machine or vehicle. Urea is a chemical used to reduce nitrogen oxides emitted by machines or vehicles, and urea emission control is very important for the environment. Urea sensor can determine the urea level by measuring the urea level in the vehicle, thereby helping the vehicle's engine maintain good efficiency and performance while ensuring environmental protection and compliance of emissions.

[0003] Normally, the urea sensor is installed above the barrel that stores urea in the vehicle. Once the urea level is too low, the computer system will send a warning signal through the warning light on the vehicle's dashboard to remind the driver to add urea.

[0004] In low temperature conditions such as winter, urea will solidify and crystallize due to low temperature. At present, in low temperature conditions, it takes a long time for the urea crystals inside the head of the urea sensor on the market to thaw naturally. After the vehicle starts running, the urea liquid cannot be extracted in time, which delays the subsequent processing of the vehicle. Utility Model Content

[0005] The utility model aims to provide a urea sensor which is convenient for thawing the liquid channel and adopts a head cavity to wrap a head urea liquid pipeline, utilizes hot thawing liquid to enter the head for circulation, and thaws the urea in the urea liquid pipeline and the urea barrel at the same time, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a urea sensor for thawing liquid channels, comprising a head shell, a conveying mechanism and an operating mechanism installed on the upper part of the head shell, and a circulation mechanism installed on the lower part of the head shell, wherein the head shell comprises an upper shell, a lower shell connected as a whole, and a head water cavity arranged inside the lower shell; the conveying mechanism comprises a water inlet nozzle and a water outlet nozzle installed on the side wall of the upper shell, and a water inlet pipeline and a water outlet pipeline arranged inside the upper shell; the circulation mechanism comprises a circulating water pipe arranged through the lower shell, and a water inlet joint and a water outlet joint arranged inside the head water cavity; the operating mechanism comprises a liquid suction pipe and a liquid return pipe arranged through the lower shell, and a liquid suction port and a liquid return port installed on the side wall of the upper shell.

[0007] The utility model further describes that the upper shell is configured as a hollow cylindrical structure with an opening at the bottom, and the bottom is connected to the lower shell; the lower shell is configured as a hollow cylindrical structure with an opening at the top, and the top is connected to the upper shell, a head water cavity is arranged inside the lower shell, and a circulating water pipe, a liquid suction pipe and a liquid return pipe are installed at the bottom; wherein, a plurality of partitions are arranged inside the head water cavity, and the height of the partitions is lower than the height of the top of the lower shell.

[0008] The utility model further illustrates that the water inlet nozzle is configured as a hollow tubular structure and is vertically installed at one end of the side wall of the upper shell body, and a water inlet pipe is arranged inside the water inlet nozzle, and the water inlet pipe is arranged horizontally along the direction of the water inlet nozzle, and the bend passes through the upper shell body downward; the water outlet nozzle is configured as a hollow tubular structure and is vertically installed at one end of the side wall of the upper shell body away from the water inlet nozzle, the water outlet nozzle is installed at a higher height than the water inlet nozzle, and a water outlet pipe is arranged inside the water inlet nozzle, and the water outlet pipe is arranged horizontally along the direction of the water outlet nozzle, and the bend passes through the upper shell body downward.

[0009] By adopting the above technical solution, the height of the water inlet joint and the water outlet joint is set to be consistent with the height of the internal partition of the head water cavity, and the height of the water inlet joint, the water outlet joint and the internal partition of the head water cavity are all lower than the top of the lower shell. The thawing liquid can flow to the head water cavity and the circulating water pipe at the same time, forming two thawing passages to thaw the urea in the suction pipe, the return pipe and the urea barrel.

[0010] The utility model further illustrates that the bottom of the circulating water pipe is arranged as a spiral structure, and the pipes at both ends of the upper part are respectively installed vertically on the bottom of the lower shell body, and one end of the top of the circulating water pipe is arranged as a water inlet, and the other end is arranged as a water outlet; the water inlet and the water outlet are both arranged inside the head water cavity, and the water inlet corresponds to the position of the water inlet pipeline along the vertical direction, and a water inlet joint is provided on the outer side thereof, and the water outlet corresponds to the position of the water outlet pipeline along the vertical direction, and a water outlet joint is provided on the outer side thereof; wherein, the installation heights of the water outlet and the water outlet joint are both lower than the top height of the lower shell body, and are flush with the height of the partition in the head water cavity.

[0011] The utility model further describes that the liquid suction pipe is arranged as a tubular structure arranged vertically on the lower shell body, and a liquid suction joint is sleeved on the top outer wall of the side close to the lower shell body; the liquid return pipe is arranged as a curved pipe structure arranged vertically on the lower shell body, and a liquid return joint is sleeved on the top outer wall of the side close to the lower shell body; wherein, the heights of the liquid suction joint and the liquid return joint are both flush with the top height of the lower shell body.

[0012] By adopting the above technical solution, the heights of the liquid suction joint and the liquid return joint are higher than the water inlet joint, the water outlet joint and the internal partition of the head water cavity, and are respectively upward to the liquid suction port and the liquid return port, thereby ensuring the airtightness of the liquid suction pipeline and the liquid return pipeline, and preventing the thawing liquid inside the head water cavity from entering the liquid suction pipeline and the liquid return pipeline to affect the correct use of the urea sensor.

[0013] The utility model further illustrates that the top of the liquid suction joint is connected with a liquid suction port along the vertical direction, the end of the liquid suction port located inside the upper shell is connected with the liquid suction joint, and the end of the liquid suction port located outside the upper shell is arranged perpendicular to the side wall of the upper shell; the top of the liquid return joint is connected with a liquid return port along the vertical direction, the end of the liquid return port located inside the upper shell is connected with the liquid return joint, and the end of the liquid return port located outside the upper shell is arranged perpendicular to the side wall of the upper shell; wherein, the liquid suction port is arranged above the liquid return port and on the side close to the water outlet.

[0014] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0015] (1) The water inlet joint, the water outlet joint and the internal baffle of the head water chamber are at the same height, and the heights of the three are all lower than the top of the lower shell. Part of the hot thawing liquid flowing out of the water inlet pipe flows directly into the head water chamber, and part of it continues to flow downward through the water inlet into the circulating water pipe. The hot thawing liquid passes through different flow paths, thereby achieving the purpose of thawing urea at different positions.

[0016] (2) The heights of the liquid suction joint and the liquid return joint are flush with the top of the lower shell, and the two are connected to the liquid suction port and the liquid return port upward, respectively. On the basis of forming a complete liquid suction pipeline and liquid return pipeline without affecting the use of the urea sensor, it can also be wrapped by the hot thawing liquid in the head water cavity for rapid thawing.

[0017] (3) As the hot thawing liquid flows inside the circulating water pipe, the spiral structure of the circulating water pipe increases the contact area with the urea in the urea barrel, and the urea in the urea barrel is thawed quickly. After the cycle is completed, the thawing liquid is discharged from the water outlet and merges with the thawing liquid in the head water cavity, and finally discharged uniformly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 The utility model is a schematic diagram of the structure of a urea sensor which facilitates thawing of a liquid channel.

[0020] Figure 2 The utility model is a schematic diagram of the explosion structure of the urea sensor which is convenient for thawing the liquid channel.

[0021] Figure 3 for Figure 2 A partial enlarged view of area A.

[0022] Figure 4 It is a structural schematic diagram of the water inlet pipeline in the utility model.

[0023] Figure 5 It is a structural schematic diagram of the water outlet pipeline in the utility model.

[0024] Figure 6 For along Figure 5 Sectional view in the BB cutting direction.

[0025] In the figure: 1. head shell; 11. upper shell; 12. lower shell; 13. head water chamber; 2. conveying mechanism; 21. water inlet pipeline; 22. water inlet nozzle; 23. water outlet pipeline; 24. water outlet nozzle; 3. circulation mechanism; 31. circulating water pipe; 32. water inlet; 33. water inlet joint; 34. water outlet; 35. water outlet joint; 4. operating mechanism; 41. liquid suction pipeline; 42. liquid suction joint; 43. liquid suction port; 44. liquid return pipeline; 45. liquid return joint; 46. liquid return port. DETAILED DESCRIPTION

[0026] The following is a further non-limiting detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-6 The utility model provides a technical solution: a urea sensor that facilitates thawing of the liquid channel, see Figure 1 , including a head shell 1, a conveying mechanism 2, a circulation mechanism 3 and an operating mechanism 4. The conveying mechanism 2 and the operating mechanism 4 are installed on the upper part of the head shell 1, and the circulation mechanism 3 is installed on the lower part of the head shell 1. The engine coolant can enter the head shell 1 and the circulation mechanism 3 from the conveying mechanism 2 to thaw the urea liquid in the operating mechanism 4 and the urea barrel.

[0028] See also Figure 2The head shell 1 includes an upper shell 11, a lower shell 12 and a head water chamber 13. The upper shell 11 is set as a hollow cylindrical structure with an opening at the bottom, and the lower shell 12 is connected to the bottom. The upper shell 11 is equipped with a water inlet 22, a water outlet 24, a liquid suction port 43 and a liquid return port 46. The upper shell 11 provides a pipeline passage for the hot thawing liquid to flow for the conveying mechanism 2 on the one hand, and wraps the operating mechanism 4 on the other hand. The lower shell 12 is set as a hollow cylindrical structure with an opening at the top, and the top is connected to the upper shell 11 to ensure the sealing of the head shell 1. The head water chamber 13 is set inside the lower shell 12, and the circulating water pipe 31, the liquid suction pipe 41 and the liquid return pipe 44 are installed at the bottom. Several partitions are set inside the head water chamber 13, and the height of the partition is lower than the top height of the lower shell 12. After the hot thawing liquid enters the head water chamber 13, it flows in the head water chamber 13, and in this process, the liquid suction pipe 41 and the liquid return pipe 44 wrapped in the head water chamber 13 are quickly thawed.

[0029] See also Figure 1 , Figure 4-6 The conveying mechanism 2 includes a water inlet pipeline 21, a water inlet nozzle 22, a water outlet pipeline 23 and a water outlet nozzle 24. The water inlet nozzle 22 and the water outlet nozzle 24 are installed on the side wall of the upper shell 11, and the water inlet pipeline 21 and the water outlet pipeline 23 are arranged inside the upper shell 11, and finally form two pipelines for the circulation of hot thawing liquid. The water inlet nozzle 22 is set as a hollow tubular structure and is vertically installed at one end of the side wall of the upper shell 11. The water inlet pipeline 21 is arranged inside the water inlet nozzle 22. The water inlet pipeline 21 is arranged horizontally along the direction of the water inlet nozzle 22, and the bend is downwardly penetrated through the upper shell 11. The hot thawing liquid enters the water inlet pipeline 21 through the water inlet nozzle 22, and then enters the head water cavity 13 and the circulating water pipe 31 respectively to thaw the urea. The water outlet 24 is configured as a hollow tubular structure and is vertically mounted on the side wall of the upper shell 11 away from the water inlet 22. The installation height of the water outlet 24 is higher than the water inlet 22, and a water outlet pipe 23 is arranged inside. The water outlet pipe 23 is arranged horizontally along the direction of the water outlet 24, and the bend passes through the upper shell 11 downward. The thawing liquid in the head water cavity 13 and the circulating water pipe 31 is discharged from the water outlet 24 through the water outlet pipe 23 to complete the circulation. The setting of the water outlet 24 higher than the water inlet 22 can also fully ensure that the head water cavity 13 and the circulating water pipe 31 are filled with hot thawing liquid for full thawing.

[0030] See also Figure 2-6The circulation mechanism 3 includes a circulating water pipe 31, a water inlet 32, a water inlet joint 33, a water outlet 34 and a water outlet joint 35. The bottom of the circulating water pipe 31 is set as a spiral structure, and the pipes at both ends of the upper part are respectively installed vertically at the bottom of the lower shell 12, and penetrate the lower shell 12 to extend to the inside of the head water cavity 13. The hot thawing liquid can enter the inside of the circulating water pipe 31 for circulation, so as to quickly thaw the urea inside the urea barrel. At the same time, the spiral structure of the circulating water pipe 31 can also increase the contact area between the hot thawing liquid and the urea, and accelerate the thawing. One end of the top of the circulating water pipe 31 is set as a water inlet 32, and the other end is set as a water outlet 34. The water inlet 32 ​​and the water outlet 34 are both set inside the head water cavity 13. The water inlet 32 ​​corresponds to the position of the water inlet pipeline 21 in the vertical direction, and the water inlet joint 33 is set on the outside. After the hot thawing liquid flows out of the water inlet pipeline 21, it can flow downward through the water inlet 32 ​​into the inside of the circulating water pipe 31. The water outlet 34 corresponds to the position of the water outlet pipe 23 in the vertical direction, and a water outlet joint 35 is sleeved on its outer side. The thawing liquid in the circulating water pipe 31 enters the head water cavity 13 through the water outlet 34, fills the head water cavity 13, and then enters the water outlet pipe 23 upward, and is finally discharged from the water outlet nozzle 24. The installation heights of the water outlet 34 and the water outlet joint 35 are both lower than the top height of the lower shell 12, and are flush with the height of the partition in the head water cavity 13. This arrangement allows the hot thawing liquid to flow into the head water cavity 13 and the circulating water pipe 31 at the same time for circulation, so as to achieve the effect of thawing the operating mechanism 4 and the urea in the urea barrel at the same time.

[0031] See also Figure 2-6 The operating mechanism 4 includes a liquid suction pipe 41, a liquid suction joint 42, a liquid suction port 43, a liquid return pipe 44, a liquid return joint 45 and a liquid return port 46. The liquid suction pipe 41 and the liquid return pipe 44 are both arranged through the lower shell 12. The liquid suction pipe 41 is arranged as a tubular structure arranged vertically to the lower shell 12, and the liquid return pipe 44 is arranged as a curved pipe structure arranged vertically to the lower shell 12. The liquid suction joint 42 is sleeved on the top outer wall of the liquid suction pipe 41 close to the lower shell 12, and the liquid return joint 45 is sleeved on the top outer wall of the liquid return pipe 44 close to the lower shell 12. The heights of the liquid suction joint 42 and the liquid return joint 45 are both flush with the top height of the lower shell 12, which can ensure that the liquid suction pipe 41 and the liquid return pipe 44 are wrapped by the head water cavity 13 while not communicating with the inside of the head water cavity 13.

[0032] See also Figure 2-5, the top of the liquid suction joint 42 is connected with a liquid suction port 43 in the vertical direction, one end of the liquid suction port 43 located inside the upper shell 11 is connected with the liquid suction joint 42, and one end of the liquid suction port 43 located outside the upper shell 11 is arranged perpendicular to the side wall of the upper shell 11. The liquid suction port 43 is arranged above the liquid return port 46 and is arranged on the side close to the water outlet 24. The liquid suction pipe 41, the liquid suction joint 42 and the liquid suction port 43 are connected to form a complete liquid suction pipeline, which can absorb urea in the urea bucket. The top of the liquid return joint 45 is connected with a liquid return port 46 in the vertical direction, one end of the liquid return port 46 located inside the upper shell 11 is connected with the liquid return joint 45, and one end of the liquid return port 46 located outside the upper shell 11 is arranged perpendicular to the side wall of the upper shell 11. The liquid return pipe 44, the liquid return joint 45 and the liquid return port 46 are connected to form a complete liquid return suction pipeline, which can make urea flow back into the urea bucket.

[0033] See also Figure 1-6 When the urea in the liquid suction pipe 41, the liquid return pipe 44 and the urea barrel crystallizes due to the low temperature, the hot thawing liquid is transported to the inside of the water inlet nozzle 22 to prepare for thawing.

[0034] The hot thawing liquid flows into the water inlet pipe 21 from the water inlet nozzle 22 and flows downward out of the water inlet pipe 21. The water inlet joint 33, the water outlet joint 35 and the internal partition of the head water chamber 13 are at the same height, and the heights of the three are lower than the top of the lower shell 12, which can provide different flow paths for the hot thawing liquid flowing out of the water inlet pipe 21, so that part of the hot thawing liquid flows directly into the head water chamber 13, and part of the hot thawing liquid continues to flow downward through the water inlet 32 ​​into the circulating water pipe 31, thereby achieving the purpose of thawing urea at different positions.

[0035] The hot thawing liquid flowing into the head water cavity 13 circulates in the head water cavity 13, and the height of the liquid suction joint 42 and the liquid return joint is flush with the top of the lower shell 12, and the two are connected to the liquid suction port 43 and the liquid return port 46 upward to form a complete liquid suction pipeline and liquid return pipeline. While the liquid suction pipeline 41 and the liquid return pipeline 44 are wrapped by the hot thawing liquid of the head water cavity 13 for thawing, the pipeline is ensured to be airtight and intact, and the hot thawing liquid is prevented from entering the pipeline and affecting the use of the urea sensor. During the flow of the hot thawing liquid in the head water cavity 13, the liquid suction pipeline 41 and the liquid return pipeline 44 wrapped by it are quickly thawed, so that the urea crystals in the liquid suction pipeline 41 and the liquid return pipeline 44 are melted and thawed. The partition set inside the head water cavity 13 can slow down the flow speed of the hot thawing liquid to increase its contact time with the liquid suction pipeline 41 and the liquid return pipeline 44, so as to better thaw.

[0036] The hot thawing liquid flowing into the circulating water pipe 31 flows inside the circulating water pipe 31. During the flow, the contact area with the urea in the urea barrel is increased by the spiral structure of the circulating water pipe 31, thereby realizing the rapid thawing of the urea in the urea barrel. The thawing liquid flowing through the circulating water pipe 31 is discharged from the water outlet 34, enters the head water cavity 13, and merges with the thawing liquid in the head water cavity 13.

[0037] After the thawing liquid in the head water chamber 13 continuously increases to the height of the water outlet pipe 23, it begins to be discharged to the water outlet nozzle 24 through the water outlet pipe 23, and finally the circulation of the thawing liquid is completed.

[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them. Although the utility model is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A urea sensor that facilitates thawing of a liquid channel, characterized in that: The invention comprises a head shell (1), a conveying mechanism (2) and a running mechanism (4) installed on the upper part of the head shell (1), and a circulation mechanism (3) installed on the lower part of the head shell (1). The head shell (1) comprises an upper shell (11), a lower shell (12) connected as a whole, and a head water chamber (13) arranged inside the lower shell (12); The conveying mechanism (2) comprises a water inlet nozzle (22) and a water outlet nozzle (24) installed on the side wall of the upper shell (11), and a water inlet pipeline (21) and a water outlet pipeline (23) arranged inside the upper shell (11); The circulation mechanism (3) comprises a circulation water pipe (31) penetrating the lower shell (12) and a water inlet joint (33) and a water outlet joint (35) arranged inside the head water chamber (13); The operating mechanism (4) comprises a liquid suction pipe (41) and a liquid return pipe (44) which are arranged through the lower shell (12), and a liquid suction port (43) and a liquid return port (46) which are installed on the side wall of the upper shell (11).

2. A urea sensor for facilitating fluid channel thawing according to claim 1, characterized in that: The upper shell (11) is configured as a hollow cylindrical structure with an opening at the bottom, and the bottom is connected to the lower shell (12); the lower shell (12) is configured as a hollow cylindrical structure with an opening at the top, and the top is connected to the upper shell (11); a head water cavity (13) is provided inside the lower shell (12), and a circulating water pipe (31), a liquid suction pipe (41) and a liquid return pipe (44) are installed at the bottom; A plurality of partitions are arranged inside the head water chamber (13), and the height of the partitions is lower than the top height of the lower shell body (12).

3. A urea sensor for facilitating fluid channel thawing according to claim 2, characterized in that: The water inlet nozzle (22) is configured as a hollow tubular structure and is vertically mounted on one end of the side wall of the upper shell (11); a water inlet pipeline (21) is disposed inside the water inlet nozzle (22); the water inlet pipeline (21) is disposed transversely along the direction of the water inlet nozzle (22) and is disposed at a bend to pass through the upper shell (11) downward; The water outlet nozzle (24) is configured as a hollow tubular structure and is vertically mounted on an end of the side wall of the upper shell (11) away from the water inlet nozzle (22). The installation height of the water outlet nozzle (24) is higher than the water inlet nozzle (22) and a water outlet pipeline (23) is arranged inside. The water outlet pipeline (23) is arranged transversely along the direction of the water outlet nozzle (24) and is arranged to pass through the upper shell (11) at a bend downward.

4. The urea sensor for facilitating fluid channel thawing according to claim 2, characterized in that: The bottom of the circulating water pipe (31) is arranged as a spiral structure, and the pipes at both ends of the upper part are respectively installed vertically on the bottom of the lower shell (12); one end of the top of the circulating water pipe (31) is arranged as a water inlet (32), and the other end is arranged as a water outlet (34); The water inlet (32) and the water outlet (34) are both arranged inside the head water cavity (13); the water inlet (32) corresponds to the position of the water inlet pipeline (21) in the vertical direction, and a water inlet joint (33) is sleeved on the outer side thereof; the water outlet (34) corresponds to the position of the water outlet pipeline (23) in the vertical direction, and a water outlet joint (35) is sleeved on the outer side thereof; The installation heights of the water outlet (34) and the water outlet joint (35) are both lower than the top height of the lower shell (12) and are flush with the height of the partition inside the head water chamber (13).

5. The urea sensor for facilitating fluid channel thawing according to claim 1, characterized in that: The liquid suction pipe (41) is configured as a tubular structure arranged vertically on the lower shell (12), and a liquid suction joint (42) is sleeved on the top outer side wall of the side close to the lower shell (12); The liquid return pipe (44) is configured as a curved pipe structure perpendicular to the lower shell (12), and a liquid return joint (45) is sleeved on the top outer side wall of the side close to the lower shell (12); The heights of the liquid suction joint (42) and the liquid return joint (45) are both flush with the top of the lower shell (12).

6. A urea sensor for facilitating fluid channel thawing according to claim 5, characterized in that: The top of the liquid suction joint (42) is connected to a liquid suction port (43) in the vertical direction, one end of the liquid suction port (43) located inside the upper shell (11) is connected to the liquid suction joint (42), and one end of the liquid suction port (43) located outside the upper shell (11) is arranged perpendicular to the side wall of the upper shell (11); The top of the liquid return joint (45) is connected to a liquid return port (46) in the vertical direction, one end of the liquid return port (46) located inside the upper shell (11) is connected to the liquid return joint (45), and one end of the liquid return port (46) located outside the upper shell (11) is arranged perpendicular to the side wall of the upper shell (11); The liquid suction port (43) is arranged above the liquid return port (46) and on a side close to the water outlet (24).

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