Small size pressure transmitter

Abstract

The utility model discloses a small size pressure transmitter belongs to the technical field of transmitter, including pressure base, circuit board and pressure sensitive element, and pressure base includes nut and circular tube, and circular tube fixedly connected in nut bottom, and nut is set with recess from top to bottom, and recess is linked together with circular tube, and pressure base height size is 21mm, and the product output line is set up on circuit board, and pressure sensitive element fixedly connected in circular tube bottom, and pressure sensitive element and circuit board electric signal connection, and the distance between pressure sensitive element bottom and pressure base top is 28.5mm. The distance between pressure sensitive element bottom and pressure base top is 28.5mm, and the volume is far less than the similar product of existing, can easily adapt to the narrow installation space of car braking system, small -size medical equipment etc.

Description

Technical Field

[0001] This utility model relates to the field of transmitter technology, and more specifically, to a small-sized pressure transmitter. Background Technology

[0002] In fields such as industrial control, automotive electronics, and medical equipment, pressure transmitters are core components for monitoring and controlling pressure parameters. As equipment in these fields becomes smaller and more precise, higher demands are placed on the size, accuracy, sealing performance, and long-term stability of pressure transmitters.

[0003] Existing pressure transmitters suffer from the following shortcomings: First, most products are large in size, with a height generally exceeding 35mm, making them difficult to fit into confined installation spaces such as automotive braking systems and small medical equipment. Second, the connection between the sensing element and the base is mostly achieved through adhesive bonding or threaded connections, resulting in poor sealing reliability and a high risk of decreased measurement accuracy or even equipment damage due to media leakage. Third, some products lack pressure interfaces, requiring additional adapters, which increases installation complexity and error risk. Fourth, they lack effective EMC protection design and dust and moisture protection measures, making them susceptible to signal interference in environments with strong electromagnetic interference or high humidity (such as HVAC systems), resulting in insufficient long-term stability and making it difficult to meet the usage requirements of high-precision scenarios such as medical and automotive applications.

[0004] In view of this, the present invention is proposed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a small-sized pressure transmitter to solve the technical problem that existing pressure transmitters are large in size and cannot be adapted to narrow installation spaces and harsh working conditions.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A small-sized pressure transmitter includes: Pressure base, the pressure base includes a nut and a round tube, the round tube is fixedly connected to the bottom of the nut, the nut has a groove from top to bottom, the groove is connected to the round tube, and the height of the pressure base is 21mm; The circuit board is fixedly mounted at the bottom of the groove by multiple copper studs. The circuit board is equipped with product output lines, which are connected to external signal receiving equipment. The pressure-sensitive element is fixedly connected to the bottom of the round tube and is electrically connected to the circuit board. The distance between the bottom of the pressure-sensitive element and the top of the pressure base is 28.5mm.

[0007] Furthermore, the pressure-sensitive element is fixed to the circular tube using laser welding.

[0008] Furthermore, the circuit board is isolated by potting compound for moisture protection, dust protection, and fixation, and the potting compound is injected through the top of the pressure base.

[0009] Furthermore, an isolation sleeve is provided on the outside of the pressure-sensitive element to isolate it from moisture and corrosive gases.

[0010] Furthermore, the outer circumference of the isolation sleeve is provided with an external thread pressure interface, which is threaded to hydraulic / pneumatic pipelines and automotive braking system pipelines.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The distance between the bottom of the pressure-sensitive element and the top of the pressure base is 28.5mm, and its volume is much smaller than that of existing similar products, making it easy to fit into narrow installation spaces such as automotive braking systems and small medical equipment. The pressure-sensitive element and the bottom of the round tube are connected by laser welding, and the weld sealing is far superior to adhesive or threaded connections, which can effectively prevent media leakage and ensure long-term stability of measurement accuracy. Attached Figure Description

[0012] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the structure of the small-sized pressure transmitter provided in this embodiment of the application; Figure 2 This is a half-sectional structural diagram of the small-sized pressure transmitter provided in this embodiment of the application.

[0013] Reference numerals: 1. Product output line; 2. Potting compound; 3. Pressure base; 4. Circuit board; 5. Copper stud; 6. Weld seam; 7. Pressure sensitive element. Detailed Implementation

[0014] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0015] See Figures 1 to 2As shown, a small-sized pressure transmitter includes: a pressure base 3, a circuit board 4, and a pressure sensing element 7. The pressure base 3 includes a nut and a round tube, with the round tube fixedly connected to the bottom of the nut. The nut has a groove from top to bottom, which communicates with the round tube. The height of the pressure base 3 is 21mm. The circuit board 4 is fixedly installed at the bottom of the groove by multiple copper studs 5. The circuit board 4 is provided with a product output line 1, which is connected to an external signal receiving device, such as a controller, data acquisition unit, or pressure gauge, to receive the 4-20mA pressure signal transmitted by the product output line 1, thereby realizing the monitoring, recording, and subsequent control operations of the pressure data. The pressure sensing element 7 is fixedly connected to the bottom of the round tube and is electrically connected to the circuit board 4. The distance between the bottom of the pressure sensing element 7 and the top of the pressure base 3 is 28.5mm.

[0016] It should be noted that the pressure-sensitive element 7 and the bottom of the circular tube are joined using laser welding to form a weld 6. Laser welding results in uniform penetration and strong sealing, effectively preventing media leakage and ensuring measurement accuracy. The pressure transmitter of this application has a total height of 28.5mm, with a compact overall structure, making it more suitable for confined installation spaces compared to existing pressure transmitters (35mm). The circuit board 4 adopts a circular structure and integrates the NSA2860 integrated chip, specifically designed for pressure transmitters. This chip is optimized for pressure signal acquisition and conversion, directly converting the analog signal output from the pressure-sensitive element 7 into a standard 4-20mA DC signal. Simultaneously, the electrical... The circuit board 4 is equipped with external matching circuitry and EAC protection devices (varistors and common-mode inductors) to resist electromagnetic interference and ensure stable signal output. The pressure-sensitive element 7 is a commercially available 89N series pressure-sensitive element, whose measurement range can be adapted to different scenarios (0-10MPa for automotive braking systems and 0-0.5MPa for medical equipment), ensuring an initial accuracy of ≤±0.1%FS. One end of the copper stud 5 is fixed to the preset screw hole of the pressure base 3 by a thread, and the other end is fixed to the circuit board 4 by an M2 screw, ensuring that the circuit board 4 is parallel to the pressure base 3 and that the copper stud 5 is in close contact with the grounding pad of the circuit board 4 to achieve circuit grounding.

[0017] In the above solution, the distance between the bottom of the pressure-sensitive element 7 and the top of the pressure base 3 is 28.5mm, and the volume is much smaller than that of existing similar products, which can easily adapt to narrow installation spaces such as automotive braking systems and small medical equipment; the pressure-sensitive element 7 and the bottom of the round tube are connected by laser welding process, and the weld sealing is far superior to adhesive or threaded connection, which can effectively prevent media leakage and ensure long-term stability of measurement accuracy.

[0018] The pressure-sensitive element 7 is fixed to the round tube by laser welding.

[0019] Circuit board 4 is isolated by potting compound 2 for moisture protection, dust protection and fixation. Potting compound 2 is injected through the top of pressure base 3. After circuit board 4 and pressure base 3 are assembled, the whole circuit is potted with potting compound 2 of model XC-382. Potting compound 2 covers the gaps on the top of circuit board 4, copper studs 5 and pressure base 3 to form a sealed protective layer, which can effectively isolate dust and moisture and adapt to humid and dusty working conditions.

[0020] The pressure-sensitive element 7 is covered with an isolation sleeve to isolate it from moisture and corrosive gases.

[0021] The outer circumference of the isolation sleeve is equipped with an external thread pressure interface (5 / 16-32UNEF-3A), which eliminates the need for additional adapters. The external thread pressure interface can be threaded to hydraulic / pneumatic pipelines and automotive braking system pipelines, reducing installation errors and complexity.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A small-sized pressure transmitter, characterized in that, include: Pressure base (3), the pressure base (3) includes a nut and a round tube, the round tube is fixedly connected to the bottom of the nut, the nut has a groove from top to bottom, the groove is connected to the round tube, and the height of the pressure base (3) is 21mm; Circuit board (4), the circuit board (4) is fixedly installed at the bottom of the groove by multiple copper studs (5), and the circuit board (4) is provided with a product output line (1), which is connected to an external signal receiving device; Pressure sensitive element (7) is fixedly connected to the bottom of the round tube. The pressure sensitive element (7) is electrically connected to the circuit board (4). The distance between the bottom of the pressure sensitive element (7) and the top of the pressure base (3) is 28.5 mm.

2. The small-size pressure transmitter according to claim 1, characterized in that, The pressure-sensitive element (7) is fixed to the round tube by laser welding.

3. The small-size pressure transmitter according to claim 1, characterized in that, The circuit board (4) is isolated by potting compound (2) for moisture protection, dust protection and fixation, the potting compound (2) being injected through the top of the pressure base (3).

4. The small-size pressure transmitter according to claim 2, characterized in that, The pressure-sensitive element (7) is covered with an isolation sleeve to isolate the pressure-sensitive element (7) from moisture and corrosive gases.

5. The small-size pressure transmitter according to claim 4, characterized in that, The outer circumference of the isolation sleeve is provided with an external thread pressure interface, which is threadedly connected to hydraulic / pneumatic pipelines and automotive braking system pipelines.

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