A differential pressure sensor base

Abstract

The present invention discloses a differential pressure sensor base, belonging to the field of sensor technology, comprising a shell, a groove is arranged on the top of the shell, an oil-filled cavity is arranged on the front of the shell, a mounting groove is arranged at the central bottom of the oil-filled cavity, six sintering holes are arranged in the oil-filled cavity, the sintering holes are symmetrically distributed on both sides of the oil-filled cavity, three sintering holes are evenly distributed on each side, lead pins are arranged in the sintering holes, the lead pins are arranged in an "L" shape, one end of the lead pin extends from the sintering hole, and the other end extends out of the groove, a first air hole is arranged in the center of the mounting groove, the first air hole passes through the shell, and a second air hole is arranged in the middle of the first air hole. The shell of the present invention is formed in an integrated manner and is fully welded and sealed, so it has good sealing performance and high overall performance, and the sealing ring setting is removed, so that the present invention is suitable for more severe environments.

Description

Technical Field

[0001] The invention belongs to the technical field of sensors, and in particular relates to a differential pressure sensor base. Background Art

[0002] Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electricity, ships, machine tools, pipelines and many other industries. In different environments, different types of pressure sensors are needed to avoid errors. Differential pressure sensor is a sensor used to measure the difference between two pressures. It is usually used to measure the pressure difference between the front and back ends of a device or component. The existing differential pressure sensor base is sealed by the sealing rings at both ends when installed in the transmitter housing. When the chemical industry and the measured medium are too corrosive, the sealing ring will be damaged, causing the transmitter measurement to be invalid or malfunction. Summary of the invention

[0003] The invention provides a differential pressure sensor base, which has the characteristics of full welding sealing.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a differential pressure sensor base, comprising a shell, a groove is provided on the top of the shell, an oil-filling cavity is provided on the front of the shell, a mounting groove is provided at the central bottom of the oil-filling cavity, six sintering holes are provided in the oil-filling cavity, the sintering holes are symmetrically distributed on both sides of the oil-filling cavity, three sintering holes are evenly distributed on each side, lead pins are provided in the sintering holes, the lead pins are arranged in an "L" shape, one end of the lead pin extends from the sintering hole, and the other end extends out of the groove, a first air hole is provided at the center of the mounting groove, the first air hole passes through the shell, a second air hole is provided in the middle position of the first air hole, the second air hole is connected to the groove, a fixing seat is provided at the end of the lead pin outside the groove, an oil filling hole is provided at the bottom of the groove, and the oil filling hole is connected to the oil filling cavity.

[0005] Preferably, an identification hole is provided in the groove.

[0006] Preferably, a fixing block is provided at the bottom of the fixing seat, the fixing block is arranged in a stepped shape, and fixing holes are provided inside the fixing block.

[0007] Preferably, glass insulators are provided outside the lead pins, and the glass insulators fill the sintering holes.

[0008] Preferably, the lead pins are arranged into three groups, each group includes two lead pins of the same length, and the end surfaces of the three groups of lead pins extending at the ends of the groove are in the same plane.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The shell of the present invention is integrally formed and fully welded for sealing, so it has good sealing performance and high overall performance, and eliminates the sealing ring setting, thereby making the present invention suitable for more severe environments, such as chemical industry and environments with highly corrosive measuring media. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure is a schematic structural diagram of a differential pressure sensor base of the present invention.

[0012] Figure 2 for Figure 1 AA section view.

[0013] Figure 3 for Figure 1 BB cross-sectional view.

[0014] Figure 4 for Figure 1 Top view of the .

[0015] Figure 5 It is a structural schematic diagram of the fixing seat of the present invention.

[0016] In the figure: 1. first vent hole; 2. oil filling chamber; 3. shell; 4. sintering hole; 5. oil filling hole; 6. identification hole; 7. groove; 8. second vent hole; 9. mounting groove; 10. glass insulator; 11. lead pin; 12. fixing seat; 13. fixing block; 14. fixing hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-5The present invention provides the following technical solutions: a differential pressure sensor base, including a shell 3, a groove 7 is arranged on the top of the shell 3, an oil-filling cavity 2 is arranged on the front of the shell 3, a mounting groove 9 is arranged at the central bottom of the oil-filling cavity 2, six sintering holes 4 are arranged in the oil-filling cavity 2, the sintering holes 4 are symmetrically distributed on both sides of the oil-filling cavity 2, three sintering holes 4 are evenly distributed on each side, lead pins 11 are arranged in the sintering holes 4, the lead pins 11 are arranged in an "L" shape, one end of the lead pin 11 extends from the sintering hole 4, and the other end extends out of the groove 7, a first air hole 1 is arranged in the center of the mounting groove 9, the first air hole 1 passes through the shell 3, a second air hole 8 is arranged in the middle position of the first air hole 1, the second air hole 8 is connected to the groove 7, a fixing seat 12 is arranged at one end of the lead pin 11 outside the groove 7, an oil filling hole 5 is arranged at the bottom of the groove 7, and the oil filling hole 5 is connected to the oil-filling cavity 2.

[0019] In the present invention, in order to prevent the lead pin 11 from being incorrectly selected in length when the lead pin 11 is fixed, resulting in a defective product, a marking hole 6 is provided in the groove 7 .

[0020] In the present invention, a fixing block 13 is arranged at the bottom of the fixing seat 12, and the fixing block 13 is arranged in a stepped shape. Fixing holes 14 are arranged inside the fixing block 13, so that the fixing seat 12 fixes the lead pin 11 to prevent the lead pin 11 from being offset during the sintering process, which affects the quality of the product.

[0021] In the present invention, glass insulators 10 are arranged outside the lead pins 11, and the glass insulators 10 fill the sintering holes 4. The glass insulators 10 are known technologies that have been disclosed and widely used in daily life. The surface of the glass insulator 10 has high mechanical strength, which makes it difficult for the surface to crack. The electrical strength of glass generally remains unchanged during the entire operation period, and its aging process is much slower than that of porcelain, which better supports and protects the insulation of internal devices.

[0022] In the present invention, the lead pins 11 are arranged into three groups, each group has two lead pins of the same length, and the end surfaces of the three groups of lead pins 11 extending at the ends of the groove 7 are in the same plane, which is convenient for fixation.

[0023] Working principle and use process of the present invention: When the present invention is used, the sensor chip is installed inside the installation groove 9 of the shell 3, the lead pin 11 is connected to the sensor chip, the oil filling cavity 2 is sealed, the first vent hole 1 is connected to the bottom of the sensor chip for ventilation and heat dissipation, and the circuit board of the sensor is installed in the groove 7 at the top of the shell 3. The other end of the lead pin 11 is electrically connected to the sensor circuit board to play a role in signal transmission, and is connected to the sensor circuit board through the second vent hole 8 for ventilation and heat dissipation; when the pressure is transmitted to the front surface of the chip, it is deformed, and negative pressure is generated on the back of the chip, thereby forming a pressure difference, and then the detection signal is obtained through the intelligent processing of the chip; the oil filling hole 5 is set, which provides convenience for the subsequent oil filling and other processes of the sensor chip. The shell 3 adopts integrated molding and full welding sealing, has good sealing and high overall performance, and removes the sealing ring setting, so that the present invention is suitable for more severe environments, such as chemical industry and environments with strong corrosiveness of the measuring medium.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A differential pressure sensor base, comprising a housing (3), characterized in that: The top of the shell (3) is provided with a groove (7), the front of the shell (3) is provided with an oil-filled cavity (2), the central bottom of the oil-filled cavity (2) is provided with a mounting groove (9), six sintering holes (4) are provided in the oil-filled cavity (2), the sintering holes (4) are symmetrically distributed on both sides of the oil-filled cavity (2), and three sintering holes (4) are evenly distributed on each side, and lead pins (11) are provided in each sintering hole (4), and the lead pins (11) are arranged in an "L" shape, and one end of the lead pin (11) is connected to the sintered cavity (2). The mounting groove (9) extends out of the hole (4), and the other end extends out of the groove (7); a first vent hole (1) is arranged at the center of the mounting groove (9); the first vent hole (1) passes through the housing (3); a second vent hole (8) is arranged at the middle of the first vent hole (1); the second vent hole (8) is connected to the groove (7); a fixing seat (12) is arranged at one end of the lead pin (11) outside the groove (7); an oil filling hole (5) is arranged at the bottom of the groove (7); the oil filling hole (5) is connected to the oil filling chamber (2); The groove (7) is provided with a marking hole (6); A fixing block (13) is arranged at the bottom of the fixing seat (12), the fixing block (13) is arranged in a stepped manner, and fixing holes (14) are arranged inside the fixing block (13); The outside of the lead pins (11) is provided with a glass insulator (10), and the glass insulator (10) fills the sintering hole (4); The lead pins (11) are arranged into three groups, each group having two leads of the same length, and the end surfaces of the three groups of lead pins (11) extending at the ends of the grooves (7) are located in the same plane.

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