A signal sensor for flow meters

Abstract

This utility model relates to the field of flow meter technology and discloses a signal sensor for flow meters, including a sensor housing, a PCB board located inside the sensor housing, and a connector located on one side of the connector end of the sensor housing. The sensor interior forms a receiving space, which includes a closed section, a transition section, and a connecting section. The connector includes a connector housing fitted inside the connecting section. The connector housing includes a main body section and a guide section. A partition is formed at the connection between the main body section and the guide section. The connector also includes a pin assembly, which includes pins. A PCB board is disposed between the partition and the sealing plate. The PCB board has pins, and the pins correspond one-to-one with the pins. By placing the PCB board and connector in the small space inside the sensor housing, the external volume of the entire signal sensor is greatly reduced, the internal structure is compact, and the integration is high. No extra space needs to be reserved during transportation or installation, and the space utilization rate is significantly improved.

Description

Technical Field

[0001] This utility model belongs to the field of flow meter technology, and specifically relates to a signal sensor for flow meters. Background Technology

[0002] A flow meter is an instrument used to measure the volume or mass of a fluid. It is used to monitor and manage fluid flow and is an indispensable key device in industrial process control, energy metering, environmental protection, and scientific research. Commonly used flow meters include target flow meters, differential pressure flow meters, rotor flow meters, and volumetric flow meters. Among these, volumetric flow meters, also known as constant displacement flow meters, offer high accuracy and cost-effectiveness.

[0003] The core principle of a volumetric flow meter is based on mechanical partitioning and a repeated filling / discharging cycle. Inside the flow meter is a precision-manufactured metering chamber and one or more meshing rotors. The rotors and the chamber form several partitioned spaces of a predetermined volume. When fluid flows into the flow meter, the pressure difference between the inlet and outlet causes the fluid pressure to drive the rotor to rotate, simultaneously filling the partitioned spaces. As the rotor continues to rotate, the fluid contained within the partitioned spaces is continuously transported to the outlet for discharge. A transmission mechanism connects the rotor to an internal counter, which records the number of rotor rotations. Based on the number of rotations and the rotation speed, the total flow rate and instantaneous flow rate can be calculated.

[0004] For example, patent (CN210198462U) discloses a screw flow meter, including an inlet housing, a metering housing, and an outlet housing. The metering housing has a metering chamber along the axial direction, the inlet housing has a liquid inlet, and the outlet housing has a measuring chamber, a liquid outlet, and a countersunk hole. A sensor is located on the top of the outlet housing. Its advantages are that it does not cause pressure or flow pulses when metering fluids, is less prone to clogging, has good measurement repeatability, and can accurately measure high-viscosity liquids. However, it also has the following disadvantages: the sensor body is relatively large, resulting in additional space occupation and inconvenience for transportation.

[0005] For example, patent (CN220018622U) discloses a twin-screw flow meter, which includes a housing with an internal cavity containing a male rotor and a female rotor arranged in parallel. The male rotor has a fixedly connected magnetic gear at its end. A chip mounting shell is also embedded inside the housing, containing a magnetic induction chip that receives pulse signals from the magnetic gear. Its advantages lie in replacing the magnetic ring used in existing twin-screw flow meters with a magnetic gear. The magnetic gear sends pulse signals to the magnetic induction chip inside the chip mounting shell to calculate the fluid flow rate. Since the module of the magnetic gear can be arbitrarily selected according to different precision requirements, its accuracy is higher and its range is wider. However, it also has the following problems: the various functional units (such as the chip mounting shell, magnetic induction chip, and magnetic gear) are scattered, failing to achieve high integration, resulting in a relatively loose overall structure.

[0006] As can be seen from the above, in the existing technology, the sensor has a large external size, insufficient internal structure compactness, low overall sensor integration, and requires a large amount of space to be reserved during installation, which poses an obstacle to the overall layout and miniaturization of the system. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a signal sensor for flow meters to solve the technical problems of large external size and loose internal structure of sensors in the prior art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A signal sensor for a flow meter includes a sensor housing, a PCB board located inside the sensor housing, and a connector located on one side of the connector end of the sensor housing. The sensor housing is cylindrical in shape and hollow with openings at both ends. The cavity forms a receiving space, which includes a closed section, a transition section, and a connecting section connected sequentially along the direction close to the connector end. A sealing plate is provided on the closed end of the sensor housing. The connector includes a connector housing fitted inside the connecting section. The connector housing includes a main body section and a guide section connected sequentially along the direction away from the connector end. A partition is formed at the connection between the main body section and the guide section. The connector also includes a pin assembly that penetrates the partition along the axial direction. The pin assembly includes a pin. A PCB board is provided between the partition and the sealing plate. Pins are provided on both sides of the PCB board near the partition end, and the pins correspond one-to-one with the pins.

[0010] Furthermore, the inner diameter of the closed section is smaller than the inner diameter of the connecting section, and the transition section is used to transition between the closed section and the connecting section.

[0011] Furthermore, the outer diameter of the main body section is consistent with the inner diameter of the connecting section. An annular limiting ring is fitted around the outer periphery of the end of the main body section facing the insertion end. The limiting ring abuts against the end face of the insertion end of the sensor housing, thereby positioning the entire insertion housing.

[0012] Furthermore, the outer diameter of the guide section is smaller than the inner diameter of the connecting section, meaning there is a gap between the outer wall of the guide section and the inner wall of the connecting section, which facilitates the insertion of the entire connector.

[0013] Furthermore, a sealing structure is provided on the periphery of the plug-in housing. The sealing structure includes a sealing groove opened on the outer side of the main body section. The sealing groove is directly opposite the partition and an O-ring is provided in the sealing groove.

[0014] Furthermore, the PCB board includes a substrate, with both ends of the substrate being close to the sealing plate and the partition, respectively, and the two ends of the substrate being fixed to the sealing plate and the partition by adhesive bonding. The two sides of the substrate are in contact with and abut against the inner walls of the closed section, the transition section and the connecting section.

[0015] Furthermore, a two-component epoxy resin is filled between the separator and the sealing plate, completely immersing the entire PCB board in the epoxy resin to form a sealed package.

[0016] Furthermore, there are four pins arranged in a square. The contact end of the pin is located inside the main body section, and the soldering end of the pin is located inside the guide section. The pin is soldered to the pin to achieve electrical connection.

[0017] Furthermore, a limiting block is provided on the edge of the outer panel of the partition. The limiting block facilitates the alignment of different pins with their corresponding holes during the insertion process, thereby improving the accuracy of the insertion and installation.

[0018] The beneficial effects of this utility model are as follows:

[0019] Compared with existing technologies, by placing the PCB board and connectors in the small space inside the sensor housing, the external volume of the entire signal sensor is greatly reduced, the internal structure is compact, and the integration is high. No extra space needs to be reserved during transportation or installation, and the space utilization rate of the signal sensor is significantly improved. Furthermore, the shortened wiring between components significantly reduces signal delay, improves data transmission speed, and enhances electromagnetic shielding performance. Attached Figure Description

[0020] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0021] Figure 1 This is an overall schematic diagram of the signal sensor for the flow meter in Embodiment 1 of this utility model;

[0022] Figure 2 This is a cross-sectional view of the signal sensor for the flow meter in Embodiment 1 of this utility model;

[0023] Figure 3 for Figure 2 Enlarged view at point A1;

[0024] Figure 4 for Figure 3 Enlarged view of section A2 in the middle.

[0025] The following labels are shown in the attached diagram:

[0026] Sensor housing 1, receiving space 101, closed section 102, transition section 103, connecting section 104, sealing plate 105, external thread 106, PCB board 2, substrate 201, pin 202, connector 3, plug housing 301, main body section 302, guide section 303, limit ring 304, separator 305, sealing groove 306, O-ring seal 307, pin 308, limit block 309. Detailed Implementation

[0027] Example 1, specifically as follows: Figures 1-4 As shown.

[0028] A signal sensor for a flow meter includes a sensor housing 1, a PCB board 2 located inside the sensor housing 1, and a connector 3 located on one side of the connector end of the sensor housing 1. It is important to emphasize that, in this embodiment, the connector end of the sensor housing 1 refers to the end where the signal sensor is plugged into a cable, connecting to a power supply and a signal acquisition device via the cable.

[0029] like Figure 1 , Figure 2 As shown, the sensor housing 1 is cylindrical in shape, hollow inside with openings at both ends. The cavity forms a receiving space 101. It is worth explaining in detail that, in this embodiment, the receiving space 101 includes a closed section 102, a transition section 103, and a connecting section 104 that are sequentially connected along the direction near the insertion end. The axes of the three are coincident. The inner diameter of the closed section 102 is smaller than the inner diameter of the connecting section 104. The transition section 103 is used to transition the connection between the closed section 102 and the connecting section 104. Specifically, the inner diameter of the outer end of the transition section 103 near the closed section 102 is the same as the inner diameter of the closed section 102, and the inner diameter of the inner end of the transition section 103 near the connecting section 104 is the same as the inner diameter of the connecting section 104. The inner diameter of the transition section 103 gradually increases along the side towards the connecting section 104.

[0030] The side opposite to the insertion end of the sensor housing 1 is the sealing end of the sensor housing 1. The sealing end is provided with a circular sealing plate 105, which seals the sealing end of the sensor housing 1. The sealing end is fixedly connected to the flow meter body. The flow meter body has a mounting hole. The sealing end is inserted into the mounting hole and fixedly connected to the flow meter body by a gasket and bolts. This is existing technology and will not be described in detail.

[0031] In this embodiment, the diameter of the sealing plate 105 is the same as the inner diameter of the closed section 102. The sealing plate 105 is nested inside the closed section 102. The outer surface of the sealing plate 105 coincides with the end face of the sealing end of the sensor housing 1. The side of the sealing plate 105 is glued and fixed to the inner wall of the closed section 102.

[0032] The outer side of the sensor housing 1 has an external thread 106, through which the signal sensor is threadedly connected to the cable.

[0033] The connector 3 includes a connector housing 301 fitted inside the connecting section 104. The connector housing 301 includes a main body section 302 and a guide section 303 connected sequentially in the direction away from the connector end. Both the main body section 302 and the guide section 303 are cylindrical. The outer diameter of the main body section 302 is the same as the inner diameter of the connecting section 104. An annular retaining ring 304 is fitted around the outer periphery of the end of the main body section 302 facing the connector end. The retaining ring 304 abuts against the end face of the connector end of the sensor housing 1, thereby positioning the entire connector housing 301. It should be further noted that the retaining ring 304 is integrally formed with the main body section 302, and the outer surface of the retaining ring 302 coincides with the outer surface of the connector end of the sensor housing 1.

[0034] The outer diameter of the guide section 303 is smaller than the inner diameter of the connecting section 104, meaning there is a gap between the outer wall of the guide section 303 and the inner wall of the connecting section 104, which facilitates the insertion of the entire connector 3. A circular plate-shaped separator 305 is formed at the connection between the main body section 302 and the guide section 303, which separates the main body section 302 from the guide section 303. It is worth emphasizing that in this embodiment, the separator 305 is located inside the main body section 302.

[0035] A sealing structure is provided around the periphery of the plug-in housing 301. This sealing structure enhances the seal between the plug-in 3 and the sensor housing 1, preventing external water from entering the signal sensor along the connection point and damaging its internal components. In this embodiment, the sealing structure includes a sealing groove 306 formed on the outer surface of the main body section 302. The sealing groove 306 is directly opposite the partition 305. An O-ring is provided within the sealing groove 306. The elastic deformation of the O-ring generates contact pressure on the sealing contact surface, thereby achieving a sealing effect.

[0036] The connector 3 also includes a pin assembly that penetrates the partition 305 axially. The pin assembly is located at the center of the partition 305. In this embodiment, the pin assembly includes four pins 308 arranged in a square. The contact ends of the pins 308 are located inside the main body section 302, and the welding ends of the pins 308 are located inside the guide section 303. A limiting block 309 is welded to the edge of the outer plate of the partition 305. The limiting block 309 facilitates the alignment of different pins 308 with their corresponding sockets during the insertion process, improving the accuracy of the insertion and installation.

[0037] A PCB board 2 is disposed between the partition 305 and the sealing plate 105. The PCB board 2 includes a substrate 201. Both ends of the substrate 201 are close to the sealing plate 105 and the partition 305, respectively, and are fixed to the sealing plate 105 and the partition 305 by adhesive bonding. The two sides of the substrate 201 contact and abut against the inner walls of the closing section 102, the transition section 103, and the connecting section 104, thereby fixing the substrate 201 and preventing the substrate 201 from rotating or deflecting during use.

[0038] Two-component epoxy resin is filled between the separator 305 and the sealing plate 105, completely immersing the entire PCB board 2 in epoxy resin to form a sealed encapsulation. On the one hand, epoxy resin has excellent electrical insulation properties, preventing short circuits and leakage during operation of the PCB board 2; on the other hand, it improves the waterproof, moisture-proof, corrosion-proof, and shock-resistant capabilities of the PCB board 2; at the same time, it can also improve heat dissipation and enhance the durability of the entire signal sensor.

[0039] Pins 202 are provided on both sides of the PCB board 2 near the separator 305. Pins 202 correspond one-to-one with pins 308. The two are soldered together to achieve electrical connection.

[0040] By placing the PCB board 2 and connector 3 within the small space inside the sensor housing 1, the external volume of the entire signal sensor is greatly reduced, the internal structure is compact, and the integration is high. No extra space needs to be reserved during transportation or installation, and the space utilization rate of the signal sensor is significantly improved. Furthermore, the shortened wiring between components significantly reduces signal delay, improves data transmission speed, and enhances electromagnetic shielding performance.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A signal sensor for a flow meter, characterized by, The sensor housing includes a sensor housing, a PCB board inside the sensor housing, and a connector on one side of the sensor housing's insertion end. The sensor housing is cylindrical in shape, hollow inside with openings at both ends. The cavity forms a receiving space, which includes a closed section, a transition section, and a connecting section connected sequentially along the direction near the insertion end. A sealing plate is provided on the sealed end of the sensor housing. The connector includes a connector housing fitted inside the connecting section. The connector housing includes a main body section and a guide section connected sequentially along the direction away from the insertion end. A partition is formed at the connection between the main body section and the guide section. The connector also includes a pin assembly that penetrates the partition along the axial direction. The pin assembly includes pins. A PCB board is provided between the partition and the sealing plate. Pins are provided on both sides of the PCB board near the partition end, and the pins correspond one-to-one with the pins.

2. The signal sensor for a flowmeter according to claim 1, characterized by The inner diameter of the closed section is smaller than that of the connecting section, and the transition section is used to transition between the closed section and the connecting section.

3. The signal sensor for a flowmeter according to claim 1, wherein The outer diameter of the main body section is the same as the inner diameter of the connecting section. An annular limiting ring is fitted around the end of the main body section facing the insertion end. The limiting ring abuts against the end face of the sensor housing insertion end, thereby positioning the entire insertion housing.

4. The signal sensor for a flowmeter according to claim 3, wherein The outer diameter of the guide section is smaller than the inner diameter of the connecting section, meaning there is a gap between the outer wall of the guide section and the inner wall of the connecting section, which facilitates the insertion of the entire connector.

5. The flowmeter signal sensor of claim 4 wherein, The periphery of the plug-in housing is provided with a sealing structure, which includes a sealing groove opened on the outer side of the main body section. The sealing groove is directly opposite the partition and an O-ring is provided in the sealing groove.

6. The flowmeter signal sensor of claim 1 wherein, The PCB board includes a substrate, with both ends of the substrate close to the sealing plate and the partition, respectively. The two ends of the substrate are fixed to the sealing plate and the partition by adhesive bonding. The two sides of the substrate are in contact with and abut against the inner walls of the closed section, the transition section and the connecting section.

7. The signal sensor for a flow meter according to claim 6, characterized in that, Two-component epoxy resin is filled between the separator and the sealing plate, and the entire PCB board is completely immersed in the epoxy resin to form a sealed package.

8. The signal sensor for a flow meter according to claim 1, characterized in that, There are four pins arranged in a square. The contact end of the pin is located inside the main body section, and the solder end of the pin is located inside the guide section. The pin is soldered to the pin to achieve electrical connection.

9. The signal sensor for a flow meter according to claim 8, characterized in that, Limiting blocks are provided on the edge of the outer panel of the separator. These limiting blocks facilitate the alignment of different pins with their corresponding holes during the insertion process, thereby improving the accuracy of the insertion and installation.

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