CN216899134U

CN216899134U - Liquid level sensor

Info

Publication number: CN216899134U
Application number: CN202220040914.0U
Authority: CN
Inventors: 顾一新
Original assignee: Dongguan Zhengyang Electronic Mechanical Co ltd
Current assignee: Guangdong Zhengyang Sensor Technology Co ltd
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-07-05
Anticipated expiration: 2032-01-07

Abstract

The utility model discloses a liquid level sensor, which comprises an installing head, and a cooling water pipe, an electronic heating pipe, an electronic tube and a liquid suction pipe which are arranged on the installing head respectively, wherein the cooling water pipe, the electronic heating pipe, the electronic tube and the liquid suction pipe are positioned below the installing head, at least part of structures of the electronic heating pipe and the liquid suction pipe are arranged in parallel, and a buoy is arranged on the electronic tube in a floating way. The liquid level sensor can quickly unfreeze solution and can absorb urea for a long time.

Description

Liquid level sensor

Technical Field

The utility model relates to the field of automobile spare and accessory parts, in particular to a liquid level sensor.

Background

In order to reduce pollution of automobile exhaust, nitrogen oxide in engine exhaust is usually required to be subjected to catalytic reduction treatment to reduce emission of nitrogen oxide. The urea has a catalytic function and can chemically react with oxynitride in the exhaust gas to convert the oxynitride into nontoxic and harmless nitrogen and moisture so as to achieve the purpose of purifying the exhaust gas, so that the SCR system is widely applied.

The euro 7 (seventy) regulations place more stringent requirements on the cold start of SCR systems, requiring that the engine start to take urea and operate normally within a relatively short time (less than 30 minutes) after starting.

The urea freezes when the temperature is lower than-11 ℃, so that the urea solution in the urea box freezes and the urea pipeline is blocked, and the urea solution cannot be sucked out and acts on the tail gas pipe of the automobile. Therefore, it is often necessary to introduce engine coolant into a urea tank containing urea to thaw the frozen urea solution. Or an electric heating device is additionally arranged in the urea pipeline, and when the electric heating device works, heat is dissipated to unfreeze frozen urea solution. However, after the engine is started, the temperature of the engine coolant is slowly raised, the amount of unfrozen urea in 30 minutes is small, and the urea in a urea pipeline cannot be unfrozen, so that the requirement of European 7 (national seventh) regulations cannot be met; and the simple adoption of the electric heating device can realize the quick thawing of the urea, but cannot meet the requirement of the SCR system for absorbing the urea for a long time due to the influence of the heating power.

Therefore, there is a need for a level sensor that can quickly thaw a solution and can extract urea for a long period of time to overcome the above-mentioned drawbacks.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a liquid level sensor which can quickly thaw a solution and can absorb urea for a long time.

In order to achieve the purpose, the liquid level sensor comprises an installation head, and a cooling water pipe, an electronic heating pipe, an electronic tube and a pipette which are arranged on the installation head respectively, wherein the cooling water pipe, the electronic heating pipe, the electronic tube and the pipette are positioned below the installation head, at least part of structures of the electronic heating pipe and the pipette are arranged in parallel, and the electronic tube is provided with a buoy capable of being arranged in a floating manner.

Preferably, the pipette and the cooling water pipe are arranged side by side in at least partial structure.

Preferably, the liquid suction pipe is vertically extended, the cooling water pipe is of a bent structure, the cooling water pipe comprises a first vertical section pipe, a second vertical section pipe and a transverse section pipe, the first vertical section pipe and the second vertical section pipe are vertically extended, the transverse section pipe and the transverse section pipe are transversely arranged, the first vertical section pipe, the transverse section pipe and the second vertical section pipe are connected end to end and are mutually communicated, and the electronic heating pipe, the first vertical section pipe and the liquid suction pipe are arranged in a mutually leaning manner.

Preferably, the electronic heating tube is of a bent structure or a spiral structure.

Preferably, the electronic heating pipe comprises a vertical branch pipe extending vertically and a transverse branch pipe arranged transversely, and the transverse branch pipe is connected to the vertical branch pipe.

Preferably, the electronic heating pipe comprises a vertical branch pipe extending vertically and a spiral branch pipe arranged spirally, and the spiral branch pipe is connected to the vertical branch pipe.

Preferably, the electronic heating pipe comprises a pipe and a heating element arranged in the pipe.

Preferably, the heating member is a PTC heating sheet, a heating wire or a ceramic heating element.

Preferably, the liquid level sensor of the present invention further comprises a temperature sensor, the temperature sensor being mounted within the electronic tube or on the mounting head.

Preferably, the temperature sensor is an NTC temperature detecting tube, a first end of the NTC temperature detecting tube is mounted to the mounting head, a second end of the NTC temperature detecting tube extends downward, and the NTC temperature detecting tube mounted to the mounting head is arranged in close proximity to the electronic heating tube.

Compared with the prior art, by using the liquid level sensor, when the urea solution is frozen and frozen, the urea solution can be heated by using the cooling water pipe 20 and the electronic heating pipe 30 simultaneously, so that the urea solution can be thawed quickly, the blank period that the urea solution cannot be absorbed in a long time when the engine is started is effectively solved, and the normal running of a vehicle is prevented from being influenced. And when the urea solution is heated by using the cooling water pipe 20 and the electronic heating pipe 30, the urea solution can be thawed in a large area, and the urea can be absorbed for a long time. In addition, when the automobile cooling circulating water system fails, even if the cooling water pipe 20 cannot play a role in heating and unfreezing the urea solution, the urea solution can be heated and unfrozen only by the electronic heating pipe 30, so that the urea solution can be normally sucked out and supplied to the vehicle SCR tail gas treatment system. And because the electronic heating pipe 30 and the liquid suction pipe 50 are at least partially arranged in parallel, the electronic heating pipe 30 can more efficiently transfer heat to the liquid suction pipe 50 when working, and the sucked urea solution is guaranteed to be completely thawed and then output to the SCR tail gas treatment system.

Drawings

FIG. 1 is a perspective view of the fluid level sensor of the present invention.

FIG. 2 is a partial block diagram of the fluid level sensor shown in FIG. 1.

Fig. 3 is a perspective view of an electronic heating tube.

FIG. 4 is a front view of an embodiment of the level sensor with the cooling water tube removed.

FIG. 5 is a side view of another embodiment of a level sensor with the chilled water line removed.

FIG. 6 is a front view of the fluid level sensor shown in FIG. 5.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

As shown in fig. 1, a liquid level sensor 100 of the present invention includes a mounting head 10, and a cooling water pipe 20, an electron heating pipe 30, an electron tube 40, and a pipette 50, each mounted on the mounting head 10. The cooling water pipe 20, the electronic heating pipe 30, the electronic tube 40 and the pipette 50 are located below the mounting head 10, the electronic heating pipe 30 and the pipette 50 are at least partially arranged in parallel, and the float 41 capable of floating arrangement is arranged on the electronic tube 40. In the present embodiment, the liquid level sensor 100 is applied to a urea tank to detect the liquid level of the urea solution. The liquid level sensor 100 can be applied to other tank structures, such as a fuel tank, according to actual needs, and is not limited thereto. The float 41 is disposed to float up and down in the electronic tube 40 according to the height of the urea solution stored in the tank, so as to detect the liquid level of the urea solution, and the structures of the electronic tube 40 and the float 41 are well known to those skilled in the art, and thus will not be described herein again.

When the urea solution is frozen and frozen, the cooling water pipe 20 and the electronic heating pipe 30 can be used for heating the urea solution at the same time, the urea solution can be thawed quickly, the blank period that the urea solution cannot be absorbed in a long time when the engine is started is effectively solved, and the influence on the normal running of a vehicle is avoided. And when the urea solution is heated by using the cooling water pipe 20 and the electronic heating pipe 30, the urea solution can be thawed in a large area, and the urea can be absorbed for a long time. In addition, when the automobile cooling circulating water system fails, even if the cooling water pipe 20 cannot play a role in heating and unfreezing the urea solution, the urea solution can be heated and unfrozen only by the electronic heating pipe 30, so that the urea solution can be normally sucked out and supplied to the vehicle SCR tail gas treatment system. Because at least part of the structures of the electronic heating pipe 30 and the liquid suction pipe 50 are arranged in parallel, the electronic heating pipe 30 can efficiently transfer heat to the liquid suction pipe 50 when working, and the sucked urea solution is guaranteed to be completely thawed and then output to the SCR tail gas treatment system.

Preferably, at least part of the structure of the liquid suction pipe 50 and the cooling water pipe 20 is arranged in parallel, so that the electronic heating pipe 30, the liquid suction pipe 50 and the cooling water pipe 20 share part of the structure and are arranged close to each other, so that the cooling water pipe 20 and the electronic heating pipe 30 directly and efficiently transfer heat to the liquid suction pipe 50, and the urea solution flowing through the liquid suction pipe 50 flows out after being completely in a flowing state.

Alternatively, whether to activate the cooling water pipe 20 and the electric heating pipe 30 simultaneously or to activate only one of the cooling water pipe 20 and the electric heating pipe 30 is selected according to the freezing degree of the urea solution or the vehicle running condition. For example, when the urea solution is seriously frozen, or when the vehicle is in a severe cold environment and just starts, in order to quickly thaw the urea solution and meet the requirements of the seventy and European seven regulations, the cooling water pipe 20 and the electronic heating pipe 30 can be started at the same time, because the temperature of the cooling water is low and the temperature rise is slow when the engine just starts, only a small amount of urea solution can be thawed, and a large amount of urea can be quickly thawed by heating through the electronic heating pipe 30 so as to ensure the normal operation of the vehicle; after the urea solution is sufficiently thawed, the cooling water pipe 20 and the electronic heating pipe 30 may be continuously kept started, or the electronic heating pipe 30 may be closed, and the urea solution may be heated only by using the cooling water pipe 20 to maintain the flowing state of the urea solution. It is preferable to turn off the electric heating pipe 30 when the engine cooling water is sufficient to thaw the urea solution and maintain the urea solution in a flowing state, thereby saving electric power. It should be noted that when the vehicle is started, the engine starts to operate, and the cooling water for cooling the engine continuously flows through the cooling water pipe 20, so that the urea solution can be heated for a long time.

As shown in fig. 1 and 2, specifically, the mounting head 10 is mounted with a water inlet joint 11, a water outlet joint 12, a urea suction joint 13, a urea return joint 14 and a urea return pipe 15. The water inlet joint 11, the water outlet joint 12, the urea absorption joint 13 and the urea return joint 14 are positioned at the top of the mounting head 10, the water inlet joint 11 and the water outlet joint 12 are both communicated with the cooling water pipe 20, the urea absorption joint 13 is communicated with the liquid suction pipe 50, the urea return pipe 15 is positioned below the mounting head 10, and the urea return pipe 15 is communicated with the urea return joint 14. When the automobile engine works, cooling water flows into the cooling water pipe 20 through the water inlet joint 11 and then is output through the water outlet joint 12 to circulate continuously. The urea solution flowing through the liquid suction pipe 50 is output through the urea suction joint 13 and supplied to the vehicle SCR system for treating the toxic and harmful gases in the automobile exhaust, and the unused urea solution is conveyed to the urea return joint 14 and is returned to the box body from the urea return pipe 15 for recycling. Further, the top of the mounting head 10 is also mounted with a first output connector 16 for transmitting liquid level, temperature and concentration signals and a second output connector 17 for transmitting electrical heating signals. The structure of the first output connector 16 and the second output connector 17 is well known to those skilled in the art, and therefore, will not be described herein.

As shown in fig. 1, the pipette 50 extends vertically. Specifically, the cooling water pipe 20 has a bent structure. The cooling water pipe 20 includes a first vertical section 21 extending vertically, a second vertical section 22 and a horizontal section 23 placed horizontally. The first vertical section pipe 21, the transverse section pipe 23 and the second vertical section pipe 22 are connected end to end and communicated with each other, and the electronic heating pipe 30, the first vertical section pipe 21 and the liquid suction pipe 50 are arranged in parallel. The temperature of the cooling water flowing into the first vertical section pipe 21 is high, and the contact area between the first vertical section pipe 21, the electronic heating pipe 30 and the liquid suction pipe 50 is large, so that the heat transfer efficiency is ensured. It should be noted that the cooling water pipe 20 may have any conventional structure, and the structure of the cooling water pipe 20 is well known to those skilled in the art and thus will not be described herein. Specifically, the cooling water pipe 20 has a structure similar to an "L", but is not limited thereto, so as to ensure a heat dissipation area of the cooling water pipe 20.

As shown in fig. 1 to 3, the electronic heating tube 30 has a bent structure. Specifically, the electronic heating pipe 30 includes a vertical branch pipe 31 extending vertically and a horizontal branch pipe 32 arranged horizontally, and the horizontal branch pipe 32 is connected to the vertical branch pipe 31. The liquid suction pipe 50, the first vertical section pipe 21 and the vertical branch pipe 31 are locked and leaned together by one clamping piece 60, and the transverse section pipe 23 and the transverse branch pipe 32 are locked and leaned together by the other clamping piece 60, so that the structure of the liquid level sensor 100 is more stable and is not easy to loosen. Preferably, the transverse branch pipe 32 is of a U-shaped structure, and the transverse branch pipe 32 has a large heat dissipation area and can rapidly transfer heat to the urea solution in the tank body so as to rapidly thaw the urea solution. Of course, the transverse branch pipe 32 can be provided in other shapes, such as a spiral shape, a continuous bending shape, etc., according to actual needs. Further, the electronic heating tube 30 includes a pipe (not shown) and a heating member (not shown) installed in the pipe. The electronic heating tube 30 has a simple structure and is easy to arrange and implement. For example, the heating member is a PTC heating sheet, but it is not limited thereto, and a heating wire or a ceramic heating element may be used. The pipe may be a metal pipe such as a copper pipe, an aluminum pipe, a steel pipe, etc. as required, and a ceramic pipe having a good thermal conductivity may be used as the pipe, so that the pipe is not limited thereto.

As shown in fig. 1, the liquid level sensor 100 of the present invention further includes a temperature sensor 70, the temperature sensor 70 is mounted on the mounting head 10, and the temperature sensor 70 can be configured to be mounted in the tube 40 according to the actual application requirement, so as to make the structure more compact and the layout more concise. The temperature sensor 70 is arranged to detect the temperature of the urea solution, and when the detected temperature of the urea solution is less than or equal to the lower limit of the set threshold value, the electronic heating pipe 30 is controlled to heat the urea solution; on the contrary, when the temperature of the urea solution is detected to be greater than the set upper threshold, the electronic heating pipe 30 is controlled to stop heating the urea solution. Therefore, the requirement of rapid heating can be met, and electric energy can be saved.

Specifically, the temperature sensor 70 is an NTC temperature probe, but is not limited thereto. The first end of the NTC temperature-detecting tube is installed on the installation head 10, the second end of the NTC temperature-detecting tube extends downwards, and the NTC temperature-detecting tube installed on the installation head 10 is arranged close to the electronic heating tube 30, so that the NTC temperature-detecting tube can accurately detect the temperature around the electronic heating tube 30, and the heating can be accurately controlled. Preferably, the pipette 50, the first vertical section of tube 21, the vertical branch tube 31 and the NTC thermal probe are locked together by the clip 60. The NTC temperature detecting tube can substantially accurately detect the temperature around the electronic heating tube 30, which facilitates accurate control of the operation of the electronic heating tube 30.

As shown in fig. 1, the liquid level sensor 100 of the present invention further includes a quality sensor 80, the quality sensor 80 is used for detecting the quality of the urea solution, and since the operation principle, structure and usage method of the quality sensor 80 are well known to those skilled in the art, the detailed description of the quality sensor 80 is omitted here. The quality sensor 80 is mounted on the transverse segment 23, and specifically, the quality sensor 80 is mounted on the transverse segment 23 by means of a snap, a buckle, or a clip, but not limited to the above mounting manner. The temperature sensor 70 extends to the quality sensor 80, the detection width of the temperature sensor 70 is wide, the temperature of the urea solution can be detected in multiple parts, and the actual temperature of the urea solution can be comprehensively evaluated. The distal end of the pipette 50 communicates with a filter structure 51, the filter structure 51 being disposed adjacent to the quality sensor 80. The filter structure 51 is provided to provide a filtering function to block the output of impurities.

As shown in FIG. 1, in order to enhance the structural stability of the installed liquid level sensor 100, a rubber pad 61 is disposed between the lateral branch pipes 32, and both ends of the rubber pad 61 are mounted on the clips 60. When the liquid level sensor 100 is installed, the installation head 10 is installed on the box body, the rubber pad 61 is installed at the bottom of the inner cavity of the box body, the fixing of the head and the tail of the liquid level sensor 100 is realized, and the structural stability of the liquid level sensor 100 after installation is effectively guaranteed.

It should be noted that the pipette 50, the first vertical section of pipe 21, the vertical branch pipe 31 and the NTC temperature detecting pipe are not locked together in whole sections. In this embodiment, the middle portions of the four are locked together by clips 60. The upper portions of the pipette 50, the vertical branch pipe 31 and the NTC thermo-detector pipe are locked together using clips, and the upper portion of the cooling water pipe 20 is arranged to be deviated. The lower portions of both the vertical minute pipe 31 and the pipette 50 are locked together using clips, and the cooling water pipe 20, the NTC thermo-tube are arranged offset. The above arrangement is not limited to the above mounting method, because the structure and mounting of each component need to be considered.

According to different application requirements, the cooling water pipe 20 of the liquid level sensor 100 can be removed, and the urea solution is heated and thawed only by using the electronic heating pipe 30. Further, the electronic heating tube 30 may also adopt different structural forms, as shown in fig. 4, the electronic heating tube 30 may be set to be a spiral structure, and the spiral electronic heating tube 30 has a large heat dissipation area and a good heating effect. Specifically, the spiral electronic heating pipe 30 includes a vertical branch pipe (not shown) extending vertically and a spiral branch pipe (not shown) arranged spirally, and the spiral branch pipe is connected to the vertical branch pipe. The pipette 50 is now located in the middle of the electronic heating tube 30, so that the urea solution flows through the pipette 50 after completely thawing. As shown in fig. 5 and 6, the electronic heating tube 30 may also be an L-shaped electronic heating tube, and the installation and connection manner may be adaptively changed according to actual situations, which is not described herein again.

The operation of the cooling water pipe 20 and the electronic heating pipe 30 when they are simultaneously operated is described as follows: when the vehicle is started, the cooling water of the engine flows into the cooling water pipe 20 through the water inlet joint 11, and the cooling water flowing through the cooling water pipe 20 flows out of the water outlet joint 12 to circulate. Simultaneously, the electronic heating pipe 30 works, and the cooling water pipe 20 and the electronic heating pipe 30 transfer heat to the liquid suction pipe 50 and also transfer heat to the urea solution to thaw the urea solution. The urea solution is sucked out by the liquid suction pipe 50 and then discharged from the urea suction joint 13, the discharged urea solution is supplied to the vehicle SCR system to treat toxic and harmful gases in the automobile exhaust, the unused urea solution is sent to the urea return pipe 15 through the urea return joint 14, and the urea solution flowing out of the urea return pipe 15 flows back to the box body. When the NTC temperature detecting tube detects that the temperature of the urea solution is less than or equal to the set lower threshold, controlling the electronic heating tube 30 to heat the urea solution; on the contrary, when the temperature of the urea solution is detected to be greater than the set upper threshold, the electronic heating pipe 30 is controlled to stop heating the urea solution. The float 41 of the electron tube 40 floats up and down according to the liquid level of the urea solution, and the liquid level of the urea solution is detected, and the quality sensor 80 detects the quality of the urea solution.

The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the utility model, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the utility model.

Claims

1. A liquid level sensor, characterized by: the electronic heating tube and the pipette are at least partially arranged in parallel, and the electronic tube is provided with a buoy capable of being arranged in a floating manner.

2. The fluid level sensor of claim 1, wherein the pipette and the cooling water tube are at least partially constructed and arranged side-by-side.

3. The liquid level sensor according to claim 1, wherein the liquid suction pipe extends vertically, the cooling water pipe is in a bent structure, the cooling water pipe comprises a first vertical section pipe, a second vertical section pipe and a transverse section pipe, the first vertical section pipe, the second vertical section pipe and the transverse section pipe are vertically extended, the first vertical section pipe, the transverse section pipe and the second vertical section pipe are connected end to end and are communicated with each other, and the electronic heating pipe, the first vertical section pipe and the liquid suction pipe are arranged in parallel.

4. The fluid level sensor of claim 1, wherein the electronic heating tube is of a bent or spiral configuration.

5. The liquid level sensor of claim 1, wherein the electronic heating tube comprises a vertical branch tube extending vertically and a transverse branch tube arranged transversely, the transverse branch tube being connected to the vertical branch tube.

6. The fluid level sensor of claim 1, wherein the electronic heating tube comprises a vertically extending vertical leg and a helically arranged helical leg connected to the vertical leg.

7. The fluid level sensor of claim 1, wherein the electronic heating tube comprises a tube and a heating element mounted within the tube.

8. The fluid level sensor of claim 7, wherein the heating element is a PTC heating sheet, a heating wire, or a ceramic heating element.

9. The fluid level sensor of claim 1, further comprising a temperature sensor mounted within the electronics tube or on the mounting head.

10. The fluid level sensor of claim 9, wherein the temperature sensor is an NTC temperature probe, a first end of the NTC temperature probe is mounted to the mounting head, a second end of the NTC temperature probe extends downward, and the NTC temperature probe mounted to the mounting head is disposed proximate to the electronic heating tube.