Differential pressure sensor with internal pipeline automatic drainage structure

Abstract

The utility model discloses a differential pressure sensor with an internal pipeline automatic drainage structure, and belongs to the technical field of differential pressure sensors. A differential pressure sensor with an internal pipeline automatic drainage structure comprises a shell and a pressure sensing element, a drainage pipe is arranged below the shell, and the differential pressure sensor is characterized by further comprising a drainage bin arranged in the shell, the drainage bin is communicated with the drainage pipe, and the volume of the drainage bin is larger than that of the drainage pipe; the dip angle group is arranged between the drainage bin and the drainage pipe; according to the utility model, through the design of the inner wall inclination angle group, the adhesion capability of condensate water is reduced, natural drainage is promoted, through the arrangement of the drainage bin, when the internal air pressure of the sensor changes, air in the drainage bin correspondingly expands and contracts, and the expansion amount of the air in the drainage bin exceeds the volume of the drainage pipe, so that a water film in the drainage pipe is pushed to be discharged; not only is the drainage efficiency improved, but also the stability and reliability of the sensor under various working conditions are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of differential pressure sensor technology, and in particular to a differential pressure sensor with an internal pipeline automatic drainage structure. Background Technology

[0002] In the automotive industry, differential pressure sensors are mainly used in particulate filters (GPF / DPF) and low-pressure exhaust gas recirculation (EGR). Their operating environment involves direct contact with vehicle exhaust. During exhaust emission, due to temperature changes, water vapor in the exhaust gas may condense into liquid water, forming condensate. If this condensate accumulates inside the sensor, it may affect the sensor's accuracy and reliability. In addition, in cold environments, moisture in the exhaust gas may freeze inside the sensor, which may cause the sensor to output incorrect signals or be permanently damaged.

[0003] Differential pressure sensors generally rely on gravity for self-drainage. The principle is that the water inside the sensor flows naturally from a high place to a low place and is discharged, avoiding water accumulation.

[0004] Using the weight of condensate to achieve natural drainage is inefficient, and in extreme applications, it can lead to excessive condensate, which can form a water film in the pipes. This water film can block the gas in the pipes, and its weight may cause negative pressure in the gas area above, resulting in condensate clogging the sensor pipes, which will affect the accuracy and reliability of the sensor. Utility Model Content

[0005] The purpose of this invention is to address the problem that relying on the weight of condensate for drainage is inefficient and, in extreme applications, can lead to excessive condensate, which forms a water film in the pipeline. This water film can block the gas in the pipeline, and its weight may cause negative pressure in the upper gas area, resulting in condensate clogging the sensor pipeline and affecting the accuracy and reliability of the sensor. Therefore, this invention proposes a differential pressure sensor with an internal pipeline automatic drainage structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A differential pressure sensor with an internal pipeline automatic drainage structure includes a housing and a pressure-sensing element installed inside the housing. A drain pipe is disposed below the housing. The sensor further includes: a drainage chamber disposed inside the housing, wherein the drainage chamber is connected to the drain pipe and is located at the upper end of the drain pipe, and the volume of the drainage chamber is larger than the volume of the drain pipe; and an inclination angle group disposed between the drainage chamber and the drain pipe, wherein the inclination angle group is used for gravity-fed drainage.

[0008] To improve the efficiency of gravity drainage, preferably, the tilt angle group includes a first tilt angle, a second tilt angle, and a third tilt angle. The first tilt angle is disposed on the inner wall of the drainage chamber near the drainage pipe, the second tilt angle is disposed on the inner wall of the drainage pipe near the drainage chamber, and the third tilt angle is disposed between the drainage pipe and the drainage chamber. The third tilt angle is connected to the first tilt angle and the second tilt angle.

[0009] To ensure stable installation of the pressure-sensing element, preferably, a mounting base is fixedly installed inside the housing, and the pressure-sensing element is fixedly connected to the mounting base.

[0010] To seal the housing, preferably, a sealing cap is fixedly connected to the top of the housing, and the sealing cap is embedded therein.

[0011] To facilitate the installation of the sensor, preferably, the housing has a threaded hole.

[0012] To power the sensor, an interface is further provided on the side of the housing away from the threaded hole.

[0013] Preferably, the volume ratio of the drainage chamber to the drainage pipe is 3:2.

[0014] Preferably, the angle formed between the tilt group and the horizontal plane is 15°-30°.

[0015] Compared with the prior art, this utility model provides a differential pressure sensor with an internal pipeline automatic drainage structure, which has the following advantages:

[0016] 1. This differential pressure sensor with an internal pipeline automatic drainage structure reduces the adhesion of condensate through the design of the inner wall tilt group, promoting natural drainage. By setting up a drainage chamber, when the internal air pressure of the sensor changes, the gas in the drainage chamber will expand and contract accordingly. Since the volume of the drainage chamber is larger than the volume of the drainage pipe below, the expansion of the gas in the drainage chamber will exceed the volume of the drainage pipe. This will push the water film in the drainage pipe to be discharged, achieving efficient drainage. This not only improves drainage efficiency but also enhances the stability and reliability of the sensor under various operating conditions. Attached Figure Description

[0017] Figure 1 This is an isometric structural diagram of a differential pressure sensor with an internal pipeline automatic drainage structure proposed in this utility model.

[0018] Figure 2 This is a schematic diagram of the housing structure of a differential pressure sensor with an internal pipeline automatic drainage structure proposed in this utility model;

[0019] Figure 3 This is a cross-sectional structural diagram of a differential pressure sensor with an internal pipeline automatic drainage structure proposed in this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the housing of a differential pressure sensor with an internal pipeline automatic drainage structure proposed in this utility model.

[0021] In the diagram: 1. Housing; 2. Pressure sensing element; 3. Drain pipe; 4. Drain chamber; 5. Tilt angle assembly; 51. First tilt angle; 52. Second tilt angle; 53. Third tilt angle; 6. Mounting base; 7. Sealing cover; 8. Threaded hole; 9. Interface. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Example:

[0025] Reference Figures 1-4 This utility model provides a differential pressure sensor with an internal pipeline automatic drainage structure, including a housing 1 and a pressure-sensing element 2 installed inside the housing 1. A drain pipe 3 is provided at the bottom of the housing 1, and a connector is provided at the lower end of the drain pipe 3 for connecting to an exhaust gas pipeline. It also includes a drain chamber 4, which is located inside the housing 1. The drain chamber 4 is connected to the drain pipe 3. Two drain chambers 4 and two drain pipes 3 are provided. The inner surfaces of the drain chambers 4 and the drain pipes 3 are coated with a hydrophobic coating to effectively reduce the adhesion of condensate on the inner walls. The drain chamber 4 is located in the drain... At the upper end of pipe 3, the volume of drainage chamber 4 is larger than that of drainage pipe 3, and the volume ratio of drainage chamber 4 to drainage pipe 3 is 3:2. By setting up a large-volume drainage chamber 4, the gas is expanded by using air pressure changes to discharge the water film from the pipeline. An inclination group 5 is set between drainage chamber 4 and drainage pipe 3. The inclination group 5 is used for gravity drainage. The angle formed by the inclination group 5 and the horizontal plane is in the range of 15°-30°, preferably 20°. The design of the inclination group 5 allows even if there is a small amount of condensate inside the sensor, it can naturally flow to a lower place and be discharged, effectively preventing water accumulation.

[0026] During operation, the design of the inner wall tilt group 5 reduces the adhesion of condensate and promotes natural drainage. By setting up the drainage chamber 4, when the internal air pressure of the sensor changes, the gas in the drainage chamber 4 will expand and contract accordingly. Since the volume of the drainage chamber 4 is larger than the volume of the lower drainage pipe 3, the expansion of the gas in the drainage chamber 4 will exceed the volume of the drainage pipe 3. This will push the water film in the drainage pipe 3 to be discharged, achieving efficient drainage. This not only improves drainage efficiency but also enhances the stability and reliability of the sensor under various working conditions.

[0027] The tilt angle group 5 includes a first tilt angle 51, a second tilt angle 52, and a third tilt angle 53. The first tilt angle 51 is disposed on the inner wall of the drainage chamber 4 near the drainage pipe 3. The second tilt angle 52 is disposed on the inner wall of the drainage pipe 3 near the drainage chamber 4. The third tilt angle 53 is disposed between the drainage pipe 3 and the drainage chamber 4. The third tilt angle 53 is connected to the first tilt angle 51 and the second tilt angle 52. A mounting base 6 is fixedly installed inside the housing 1. The mounting base 6 is connected to the housing 1 by adhesive. The pressure sensing element 2 is fixedly connected to the mounting base 6. A sealing cover 7 is fixedly connected to the top of the housing 1. The sealing cover 7 is connected to the housing 1 by adhesive and is embedded in the housing. A threaded hole 8 is provided on the housing 1. The characteristic feature is that an interface 9 is provided on the side of the housing 1 away from the threaded hole 8.

[0028] When there is a small amount of condensation inside the sensor during operation, the design of the first tilt angle 51, the second tilt angle 52 and the third tilt angle 53 allows the condensation to flow naturally to a lower position and be discharged, effectively preventing water accumulation.

[0029] This differential pressure sensor features an internal pipeline automatic drainage structure. During use, the design of the inner wall tilt group 5 reduces the adhesion of condensate and promotes natural drainage. By setting up a drainage chamber 4, when the internal air pressure of the sensor changes, the gas in the drainage chamber 4 will expand and contract accordingly. Since the volume of the drainage chamber 4 is larger than the volume of the lower drainage pipe 3, the expansion of the gas in the drainage chamber 4 will exceed the volume of the drainage pipe 3. This will push the water film in the drainage pipe 3 out, achieving efficient drainage. This not only improves drainage efficiency but also enhances the stability and reliability of the sensor under various operating conditions.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A differential pressure sensor with an internal pipeline automatic drainage structure, comprising a housing (1) and a pressure-sensing element (2) installed inside the housing (1), wherein a drain pipe (3) is provided below the housing (1), characterized in that, Also includes: The drainage chamber (4) is located inside the shell (1). The drainage chamber (4) is connected to the drainage pipe (3), the drainage chamber (4) is located at the upper end of the drainage pipe (3), and the volume of the drainage chamber (4) is greater than the volume of the drainage pipe (3). An inclined group (5) is set between the drainage chamber (4) and the drainage pipe (3). The tilt angle group (5) is used for gravity drainage.

2. A differential pressure sensor with an internal pipeline automatic drainage structure according to claim 1, characterized in that, The tilt angle group (5) includes a first tilt angle (51), a second tilt angle (52) and a third tilt angle (53). The first tilt angle (51) is set on the inner wall of the drainage chamber (4) near the drainage pipe (3). The second tilt angle (52) is set on the inner wall of the drainage pipe (3) near the drainage chamber (4). The third tilt angle (53) is set between the drainage pipe (3) and the drainage chamber (4). The third tilt angle (53) is connected to the first tilt angle (51) and the second tilt angle (52).

3. A differential pressure sensor with an internal pipeline automatic drainage structure according to claim 1, characterized in that, The housing (1) is fixedly installed with a mounting base (6), and the pressure sensing element (2) is fixedly connected to the mounting base (6).

4. A differential pressure sensor with an internal pipeline automatic drainage structure according to claim 1, characterized in that, A sealing cover (7) is fixedly connected to the top of the housing (1), and the sealing cover (7) is embedded therein.

5. A differential pressure sensor with an internal pipeline automatic drainage structure according to claim 1, characterized in that, The housing (1) has a threaded hole (8).

6. A differential pressure sensor with an internal pipeline automatic drainage structure according to claim 5, characterized in that, An interface (9) is provided on the side of the housing (1) away from the threaded hole (8).

7. A differential pressure sensor with an internal pipeline automatic drainage structure according to claim 1, characterized in that, The volume ratio of the drainage chamber (4) to the drainage pipe (3) is 3:

2.

8. A differential pressure sensor with an internal pipeline automatic drainage structure according to claim 1, characterized in that, The angle range between the tilt group (5) and the horizontal plane is 15°-30°.

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