A sensor with a flow guide tube

Abstract

The utility model belongs to the field of sensor technology, and specifically provides a sensor with a flow guide tube, including a shell and a flow guide tube; a sensor assembly is arranged in the shell; a pressure inlet is arranged on the bottom surface of the installation groove; the sensing element of the sensor assembly blocks one side of the pressure inlet; one end of the flow guide tube is inserted into the installation groove, and the flow guide tube is connected with the pressure inlet; a gap is formed between the edge of the installation groove and the flow guide tube; the gap is filled with solder. The sensor with a flow guide tube provided by the utility model plays a limiting role by designing a mounting groove at the bottom of the shell that is vertically assembled with the flow guide tube, which facilitates the connection of the flow guide tube. The chamfer on the side of the mounting groove not only has a guiding role, but also facilitates the natural flow of liquid solder into the weld during welding, and can also play a role in storing solder, further blocking the gap between the flow guide tube and the mounting groove to ensure air tightness.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to a sensor with a flow guide tube. Background Art

[0002] The sensor for measuring fluid pressure / temperature needs to ensure good air tightness during the test. If the fluid leaks from the sensor channel, the pressure detected by the sensor will be lower than the actual pressure, resulting in inaccurate pressure measurement, and even safety hazards due to fluid leakage. For pressure sensors with copper tubes, it is necessary to connect the copper tubes to the shell. The connection structure and matching method between the copper tube and the pressure sensor will affect the air tightness. If the copper tube is directly welded to the shell and then the sensor is assembled, it will cost more to ensure its sealing during calibration test and helium test. Therefore, it is usually adopted to assemble the sensor first, weld the copper tube to the bushing by vacuum brazing, and then weld the bushing to the boss at the bottom of the sensor shell by laser welding to obtain a sensor equipped with a copper tube. The manufacturing process of this structure is cumbersome, and often due to factors such as welding process, tooling size, product material, etc., there will be problems of poor welding, resulting in incomplete sealing at the welding point, and there is a great risk of leakage, which greatly reduces the reliability and safety of such sensors and increases the production cost of the product. Utility Model Content

[0003] The utility model aims to solve the problems of complicated connection structure and poor air tightness of the existing sensor with copper tube.

[0004] To this end, the utility model provides a sensor with a flow guide tube, comprising a shell and a flow guide tube; a sensor assembly is arranged in the shell; a mounting groove is arranged on the shell; a pressure inlet is arranged on the bottom surface of the mounting groove; a sensing element of the sensor assembly blocks one side of the pressure inlet; one end of the flow guide tube is inserted into the mounting groove, and the flow guide tube is connected to the pressure inlet; a gap is formed between the edge of the mounting groove and the flow guide tube; and a solder layer is filled in the gap.

[0005] Specifically, the outer wall of the guide tube is provided with a flange; the flange is arranged at one end of the guide tube connected to the mounting groove; the flange is connected to the chamfer through a solder layer.

[0006] Specifically, a connector is connected to the housing; a pin of the connector is connected to the sensor assembly.

[0007] Specifically, the housing is provided with a mounting hole; the connector is provided with a protrusion matching the mounting hole; the connector is riveted to the housing through the protrusion and the mounting hole.

[0008] Specifically, a sealing ring is installed between the outer wall of the protrusion and the inner wall of the installation hole.

[0009] Specifically, the above-mentioned connector is a plastic connector.

[0010] Specifically, the above-mentioned flow guide pipe is a copper pipe.

[0011] Specifically, the edge of the installation groove is provided with a chamfer; a gap is formed between the chamfer and the guide pipe.

[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0013] The sensor with a guide tube provided by the utility model plays a limiting role by designing a mounting groove at the bottom of the shell to be assembled vertically with the guide tube, which is convenient for connecting the guide tube. The chamfer on the side of the mounting groove not only has a guiding role, but also facilitates the natural flow of liquid solder into the weld during welding, and can also play a role in storing solder, further blocking the gap between the guide tube and the mounting groove to ensure air tightness. The thickness of the solder layer at the connection is greater than that of conventional vertical plane welding, and pores are not easy to appear. In addition, the chamfer cooperates with the flange of the outer wall of the guide tube, so that the solder used to connect the guide tube and the shell has a larger contact area, and more solder is filled between the guide tube and the shell, which can improve the strength of the weld and help ensure good sealing at the weld.

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a sensor with a flow guide tube provided by the utility model.

[0016] Figure 2 The utility model is a schematic diagram of the structure of the connection between the housing of the sensor with the flow guide tube and the flow guide tube.

[0017] Figure 3 It is a schematic diagram of the shell structure of the sensor with the flow guide tube provided by the utility model.

[0018] Figure 4 The utility model is a schematic diagram of the flow guide tube structure of the sensor with the flow guide tube.

[0019] Explanation of the reference numerals: 1. Shell; 101. Mounting groove; 102. Chamfer; 103. Pressure inlet; 2. Sensor assembly; 201. Sensing element; 3. Flow guide tube; 301. Flange; 4. Solder layer; 5. Sealing ring; 6. Connector. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. 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.

[0021] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] Reference Figure 1-4 The utility model provides a sensor with a flow guide tube, comprising a shell 1 and a flow guide tube 3; a sensor assembly 2 is arranged in the shell 1; a mounting groove 101 is arranged on the shell 1; a pressure inlet 103 is arranged on the bottom surface of the mounting groove 101; a sensing element 201 of the sensor assembly 2 blocks one side of the pressure inlet 103; one end of the flow guide tube 3 is inserted into the mounting groove 101, and the flow guide tube 3 is connected with the pressure inlet 103; a gap is formed between the edge of the mounting groove 101 and the flow guide tube 3; a solder layer 4 is filled in the gap. In actual production, the solder is preferably a brazing material, and the flow guide tube 3 is preferably a copper tube. During installation, one end of the flow guide tube 3 is inserted into the mounting groove 101 to ensure that the flow guide tube 3 is connected with the pressure inlet 103. Vacuum brazing is adopted to make the liquid brazing material automatically flow into the installation groove 101 from the gap, and fill the gap between the installation groove 101 and the guide tube 3, forming a brazing material layer 4, blocking the gap between the guide tube 3 and the installation groove 101, and ensuring the air tightness of the connection between the guide tube 3 and the housing 1. When in use, the monitored fluid contacts the sensing element 201 of the sensor assembly 2 through the guide tube 3 and the pressure inlet 103, and then the sensor assembly 2 obtains the corresponding data.

[0023] Specifically, a chamfer 102 is provided at the edge of the mounting groove 101 , and a gap is formed between the chamfer 102 and the flow guide tube 3 . The solder layer 4 is filled between the chamfer 102 and the flow guide tube 3 .

[0024] Furthermore, the outer wall of the flow guide tube 3 is provided with a flange 301; the flange 301 is arranged at one end of the flow guide tube 3 connected to the mounting groove 101; the flange 301 is connected to the chamfer 102 through the solder layer 4. The flange 301 is preferably a curved structure, which cooperates with the chamfer 102 to provide more contact area for the solder layer 4, and the solder is more attached to the surface of the flow guide tube 3 and the shell 1, which can improve the strength of the weld and help ensure good sealing of the weld.

[0025] Preferably, the diameter of the mounting groove 101 matches the outer diameter of the guide tube 3, that is, the diameter of the mounting groove 101 is slightly larger than the outer diameter of the guide tube 3, ensuring that the guide tube 3 can be inserted into the mounting groove 101, and the gap between the outer wall of the guide tube 3 and the inner wall of the mounting groove 101 is small, reducing the risk of leakage.

[0026] Specifically, a connector is connected to the housing 1, and a pin of the connector 6 is connected to the sensor assembly 2. The connector 6 is preferably a plastic connector 6, and the sensor with the guide tube is connected to the working position through the connector 6.

[0027] In a detailed embodiment, the housing 1 is provided with a mounting hole; the connector 6 is provided with a protrusion matching the mounting hole; the connector 6 is riveted to the housing 1 through the protrusion and the mounting hole. The protrusion is a hollow structure, and during installation, the pin of the connector 6 is inserted into the housing 1 through the protrusion and the mounting hole to connect with the sensor assembly 2, and the protrusion is inserted into the mounting hole for welding to achieve the connection between the connector 6 and the housing 1.

[0028] In order to improve the tightness of the connection, a sealing ring 5 is installed between the outer wall of the protrusion and the inner wall of the installation hole.

[0029] In summary, the sensor with a guide tube provided by the utility model plays a limiting role by designing a mounting groove 101 at the bottom of the shell 1 to be vertically assembled with the guide tube 3, which facilitates the connection of the guide tube 3. The chamfer 102 on the side of the mounting groove 101 not only has a guiding function, but also facilitates the natural flow of liquid solder into the weld during welding, and can also play a role in storing solder, further blocking the gap between the guide tube 3 and the mounting groove 101 to ensure air tightness. The thickness of the solder at the connection is greater than that of conventional vertical plane welding, and pores are not easy to appear. In addition, the chamfer 102 cooperates with the flange 301 on the outer wall of the guide tube 3, so that the solder used to connect the guide tube 3 and the shell 1 has a larger contact area, and more solder is filled between the guide tube 3 and the shell 1, which can improve the strength of the weld and help ensure good sealing at the weld.

[0030] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A sensor with a flow guide tube, characterized in that: The invention comprises a shell (1) and a flow guide tube (3); a sensor assembly (2) is arranged in the shell (1); a mounting groove (101) is arranged on the shell (1); a pressure inlet (103) is arranged on the bottom surface of the mounting groove (101); a sensing element (201) of the sensor assembly (2) blocks one side of the pressure inlet (103); one end of the flow guide tube (3) is inserted into the mounting groove (101), and the flow guide tube (3) is connected to the pressure inlet (103); a gap is formed between the edge of the mounting groove (101) and the flow guide tube (3); and a solder layer (4) is filled in the gap.

2. The sensor with a flow guide tube as claimed in claim 1, characterized in that: The edge of the installation groove (101) is provided with a chamfer (102); a gap is formed between the chamfer (102) and the flow guide pipe (3).

3. The sensor with a flow guide tube as claimed in claim 2, characterized in that: The outer wall of the flow guide tube (3) is provided with a flange (301); the flange (301) is arranged at one end of the flow guide tube (3) connected to the mounting groove (101); the flange (301) is connected to the chamfer (102) via a solder layer (4).

4. The sensor with a flow guide tube as claimed in claim 1, characterized in that: A plug connector (6) is connected to the housing (1); a plug pin of the plug connector (6) is connected to the sensor assembly (2).

5. The sensor with a flow guide tube as claimed in claim 4, characterized in that: The housing (1) is provided with a mounting hole; the connector (6) is provided with a protrusion matching the mounting hole; the connector (6) is riveted to the housing (1) via the protrusion and the mounting hole.

6. The sensor with a flow guide tube as claimed in claim 5, characterized in that: A sealing ring (5) is installed between the outer wall of the protrusion and the inner wall of the installation hole.

7. The sensor with a flow guide tube as claimed in claim 4, characterized in that: The plug connector (6) is a plastic plug connector (6).

8. The sensor with a flow guide tube as claimed in claim 1, characterized in that: The flow guide tube (3) is a copper tube.

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