Ceramic pressure transmitter simple and convenient to assemble

Abstract

The utility model discloses a ceramic pressure transmitter easy and convenient to assemble. The ceramic pressure transmitter comprises a pressure inlet head, a metal tube shell, a ceramic sensor with an amplification circuit board, a rubber support and a metal cover. The lower end of the metal tube shell is arranged at the upper end of the pressure inlet head, the ceramic sensor with the amplification circuit board is limited on the lower surface of the rubber bracket and is arranged in the metal tube shell, and the metal cover is arranged at the upper end of the metal tube shell; the ceramic sensor with the amplification circuit board comprises the amplification circuit board and a ceramic core body, the amplification circuit board is arranged on the upper surface of the ceramic core body, a signal line and a ceramic core body metal needle are arranged on the amplification circuit board, the lower surface of the ceramic core body is fixed to the top face of the pressing head, and a layer of sealant is laid on the upper surface of the amplification circuit board. A metal cover opening is formed in the upper surface of the metal cover, and the signal line penetrates through the metal cover opening to be connected with the outside. The utility model has the characteristics of simple and reliable assembly, has stronger practicability compared with the assembly mode at the present stage, and can improve the production efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of instruments and meters, and particularly relates to a ceramic pressure transmitter which is easy to assemble. Background Art

[0002] Pressure transmitters, which convert pressure into pneumatic or electrical signals for control and transmission, are among the most common sensors used in industrial fields. Ceramic pressure transmitters, due to their wear and corrosion resistance, high stability, high reliability, and ease of installation, are widely used for measuring gas, liquid, and steam pressure in various industries, including power generation, metallurgy, industrial automation, environmental monitoring, petrochemicals, and fire protection. Furthermore, ceramic pressure transmitters offer low production costs, saving customers money.

[0003] Currently, most pressure transmitters based on ceramic pressure cores use clamps to secure the ceramic core within the transmitter housing, with a sealing O-ring located beneath. During this process, operators must use bent-nose pliers to hold the clamps in place while simultaneously squeezing the ceramic core downward to secure it. This makes the assembly process laborious and demanding. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide a ceramic pressure transmitter that is easy to assemble, has the characteristics of easy assembly and reliability, is highly practical, and can improve production efficiency.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A ceramic pressure transmitter with simple assembly, comprising a pressure feed head, a metal tube shell, a ceramic sensor with an amplifying circuit board, a rubber bracket and a metal cover; the lower end of the metal tube shell is arranged at the upper end of the pressure feed head, the ceramic sensor with the amplifying circuit board is limited to the lower surface of the rubber bracket and arranged inside the metal tube shell, and the metal cover is arranged at the upper end of the metal tube shell and abuts against the upper surface of the rubber bracket; the ceramic sensor with the amplifying circuit board comprises an amplifying circuit board and a ceramic core, the amplifying circuit board is arranged on the upper surface of the ceramic core, a signal line and a ceramic core metal pin are provided on the amplifying circuit board, the lower surface of the ceramic core is fixed to the top surface of the pressure feed head, a layer of sealant is laid on the upper surface of the amplifying circuit board, and a metal cover opening is provided on the upper surface of the metal cover, through which the signal line passes to connect to the outside world.

[0007] Preferably, the pressure inlet head is provided with a pressure inlet head pressure conducting cavity for transmitting medium pressure; the top surface of the pressure inlet head is provided with a pressure inlet head annular groove, and a ceramic sensor sealing O-ring is provided in the pressure inlet head annular groove.

[0008] Preferably, a pressure head limiting groove for limiting the insertion depth of the lower end of the metal tube shell and a hexagonal lower surface of the pressure head are provided on the side wall of the pressure head, and a sealing O-ring is provided on the hexagonal lower surface of the pressure head.

[0009] Preferably, the metal tube shell is provided with a tube shell accommodating cavity, the upper surface of the metal tube shell is provided with an upper inner chamfer of the tube shell cavity, and the lower surface of the metal tube shell is provided with a lower inner chamfer of the tube shell cavity. The lower end of the metal tube shell is guided by the cooperation of the lower inner chamfer of the tube shell cavity, so that the pressure head is placed inside the tube shell accommodating cavity, and the lower surface of the metal tube shell is sealed and fitted with the upper surface of the pressure head limiting groove.

[0010] Preferably, the ceramic core is provided with a ceramic core pressure cavity for sealing and measuring medium pressure, and the lower surface of the ceramic core is squeezed and sealed with the top surface of the pressure inlet head through a ceramic sensor sealing O-ring.

[0011] Preferably, the rubber bracket is provided with a bracket accommodating cavity, the ceramic sensor with the amplifying circuit board is placed in the bracket accommodating cavity, the upper surface of the rubber bracket is provided with a bracket outer chamfer, the rubber bracket is arranged in the tube shell accommodating cavity through the guidance of the bracket outer chamfer, and is sealed and limited on the upper surface of the ceramic core.

[0012] Preferably, the metal cover is provided with a metal cover accommodating cavity, the diameter of the metal cover is larger than the diameter of the metal cover accommodating cavity and is consistent with the diameter of the metal tube shell, the diameter of the metal cover accommodating cavity is consistent with the diameter of the bracket accommodating cavity, the lower surface of the metal cover and the upper surface of the metal tube shell are fastened together by laser welding, and at the same time, the lower surface of the metal cover accommodating cavity is squeezed and fixed to the upper surface of the rubber bracket.

[0013] Preferably, the rubber bracket is made of fluororubber.

[0014] The beneficial effects of this utility model include: the ceramic core is secured by extrusion sealing between the rubber bracket, metal cover, and metal shell, and laser welding is used to achieve a sealed connection between the pressure inlet head and the metal shell, and between the metal cover and the metal shell. Compared to the previous method of securing the ceramic core with clamps, the entire assembly process is simple, time-saving, and labor-saving. It also does not require the involvement of large equipment and does not require excessive operator skills. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is an exploded view of the utility model;

[0017] In the figure, 1. Sealing O-ring; 2. Pressure inlet head; 21. Circular groove of pressure inlet head; 22. Hexagonal lower surface of pressure inlet head; 23. Pressure guide cavity of pressure inlet head; 24. Limiting groove of pressure inlet head; 3. Sealing O-ring of ceramic sensor; 4. Metal tube shell; 41. Tube shell accommodating cavity; 42. Upper inner chamfer of tube shell cavity; 43. Lower inner chamfer of tube shell cavity; 5. Ceramic sensor with amplifying circuit board; 51. Amplifying circuit board; 52. Ceramic core; 53. Signal line; 54. Metal needle of ceramic core; 55. Pressure cavity of ceramic core; 6. Rubber bracket; 61. Bracket accommodating cavity; 62. External chamfer of bracket; 7. Metal cover; 71. Metal cover accommodating cavity; 72. Metal cover opening; 8. Sealant. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] like Figure 1-2 As shown, the utility model is a ceramic pressure transmitter with simple assembly, which includes a pressure inlet head 2, a metal tube shell 4, a ceramic sensor 5 with an amplifying circuit board, a rubber bracket 6 and a metal cover 7; wherein the lower end of the metal tube shell 4 is arranged at the upper end of the pressure inlet head 2, the ceramic sensor 5 with the amplifying circuit board is limited to the lower surface of the rubber bracket 6 and is arranged inside the metal tube shell 4, and the metal cover 7 is arranged at the upper end of the metal tube shell 4 and abuts against the upper surface of the rubber bracket 6.

[0020] The ceramic sensor 5 with an amplifying circuit board in the present invention includes an amplifying circuit board 51 and a ceramic core 52. The amplifying circuit board 51 is arranged on the upper surface of the ceramic core 52. A signal line 53 and a ceramic core metal needle 54 are provided on the amplifying circuit board 51. The lower surface of the ceramic core 52 is fixed to the top surface of the pressure inlet head 2. A layer of sealant 8 is laid on the upper surface of the amplifying circuit board 51. A metal cover opening 72 is provided on the upper surface of the metal cover 7. The signal line 53 passes through the metal cover opening 72 to connect with the outside world.

[0021] The pressure inlet head 2 of the present invention is provided with a pressure inlet head pressure-guiding cavity 23 for transmitting medium pressure. A circular groove 21 is provided on the top surface of the pressure inlet head 2, within which a ceramic sensor sealing O-ring 3 is located. The sidewalls of the pressure inlet head 2 are provided with a pressure inlet head limit groove 24 for limiting the insertion depth of the lower end of the metal tube shell 4, and a hexagonal lower surface 22 of the pressure inlet head, on which a sealing O-ring 1 is located.

[0022] The metal tube shell 4 in the present invention is provided with a tube shell accommodating cavity 41, the upper surface of the metal tube shell 4 is provided with an upper inner chamfer 42 of the tube shell cavity, and the lower surface of the metal tube shell 4 is provided with a lower inner chamfer 43 of the tube shell cavity. The lower end of the metal tube shell 4 is guided by the cooperation of the lower inner chamfer 43 of the tube shell cavity, so that the pressure head 2 is placed inside the tube shell accommodating cavity 41, and the lower surface of the metal tube shell 4 is sealed and fitted with the upper surface of the pressure head limiting groove 24.

[0023] The ceramic core 52 of the present invention is provided with a ceramic core pressure chamber 55 for sealing and measuring medium pressure. The lower surface of the ceramic core 52 is squeezed and sealed against the top surface of the pressure inlet head 2 by the ceramic sensor sealing O-ring 3.

[0024] The rubber bracket 6 made of fluororubber in the present invention is provided with a bracket accommodating cavity 61, and the ceramic sensor 5 with the amplifying circuit board is placed in the bracket accommodating cavity 61. The upper surface of the rubber bracket 6 is provided with a bracket outer chamfer 62. The rubber bracket 6 is arranged in the tube shell accommodating cavity 41 through the guidance of the bracket outer chamfer 62, and is sealed and limited on the upper surface of the ceramic core 52, so as to enclose the amplifying circuit board 51 in the rubber bracket 6.

[0025] The metal cover 7 in the present invention is provided with a metal cover accommodating cavity 71. The diameter of the metal cover 7 is larger than the diameter of the metal cover accommodating cavity 71 and is consistent with the diameter of the metal tube shell 4. The diameter of the metal cover accommodating cavity 71 is consistent with the diameter of the bracket accommodating cavity 61. The lower surface of the metal cover 7 is fastened to the upper surface of the metal tube shell 4 by laser welding. At the same time, the lower surface of the metal cover accommodating cavity 71 is squeezed and fixed to the upper surface of the rubber bracket 6.

[0026] The use process of this utility model is as follows:

[0027] Assembly of the pressure transmitter: First, the ceramic sensor sealing O-ring 3 is set in the annular groove 21 of the pressure inlet head. Further, the lower end of the metal tube shell 4 is guided by the matching chamfer 43 of the lower inner side of the tube shell cavity, so that the pressure inlet head 2 is placed inside the tube shell accommodating cavity 41, and the lower surface of the metal tube shell 4 and the upper surface of the pressure inlet head limiting groove 24 are sealed and fixed by laser welding technology. Further, the ceramic sensor 5 with the amplified circuit board is placed inside the tube shell accommodating cavity 41, and the upper surface of the pressure inlet head 2 is squeezed and fitted with the lower surface of the ceramic sensor 5 with the amplified circuit board; then the rubber bracket 6 is set in the tube shell accommodating cavity 41 through the guidance of the bracket outer chamfer 62, and is sealed and limited on the upper surface of the ceramic core 52. It is used to wrap the amplifier circuit board 51 in the rubber bracket 6, and then place the metal cover 7 on the rubber bracket 6 and the upper end of the metal tube shell 4. The lower end of the metal cover 7 is set in the tube shell accommodating cavity 41 by guiding the inner chamfer 42 on the tube shell cavity. The metal cover 7 and the metal tube shell 4 are squeezed and sealed against each other by the tooling. The metal cover 7 and the metal tube shell 4 are fastened together by laser welding technology, and the signal line 53 on the amplifier circuit board 51 is connected to the outside world through the metal cover opening 72 on the upper surface of the metal cover 7. Then, a layer of sealant 8 is laid on the upper surface of the amplifier circuit board 51. Finally, the sealing O-ring 1 is set on the hexagonal lower surface 22 of the pressure inlet head. The assembly of the entire pressure transmitter is completed.

[0028] Other undescribed parts of the present invention are the same as those of the prior art.

Claims

1. A ceramic pressure transmitter with easy assembly, characterized by It comprises a pressure inlet head (2), a metal tube shell (4), a ceramic sensor with an amplifying circuit board (5), a rubber bracket (6) and a metal cover (7); the lower end of the metal tube shell (4) is arranged at the upper end of the pressure inlet head (2); the ceramic sensor with an amplifying circuit board (5) is located on the lower surface of the rubber bracket (6) and is arranged inside the metal tube shell (4); the metal cover (7) is arranged at the upper end of the metal tube shell (4) and abuts against the upper surface of the rubber bracket (6); the ceramic sensor with an amplifying circuit board (5) comprises an amplifying circuit board. A large circuit board (51) and a ceramic core (52), wherein the amplifying circuit board (51) is arranged on the upper surface of the ceramic core (52), a signal line (53) and a ceramic core metal needle (54) are provided on the amplifying circuit board (51), the lower surface of the ceramic core (52) is fixed to the top surface of the pressure inlet head (2), a layer of sealant (8) is laid on the upper surface of the amplifying circuit board (51), a metal cover opening (72) is provided on the upper surface of the metal cover (7), and the signal line (53) passes through the metal cover opening (72) to connect with the outside world.

2. The ceramic pressure transmitter with easy assembly according to claim 1 is characterized in that The pressure inlet head (2) is provided with a pressure inlet head pressure-conducting cavity (23) for conducting medium pressure; the top surface of the pressure inlet head (2) is provided with a pressure inlet head annular groove (21), and a ceramic sensor sealing O-ring (3) is provided in the pressure inlet head annular groove (21).

3. The ceramic pressure transmitter with easy assembly according to claim 2 is characterized in that A pressure head limiting groove (24) for limiting the insertion depth of the lower end of the metal tube shell (4) and a hexagonal lower surface (22) of the pressure head are provided on the side wall of the pressure head (2), and a sealing O-ring (1) is provided on the hexagonal lower surface (22) of the pressure head.

4. The ceramic pressure transmitter with easy assembly according to claim 3 is characterized in that The metal tube shell (4) is provided with a tube shell accommodating cavity (41), the upper surface of the metal tube shell (4) is provided with an upper inner chamfer (42) of the tube shell cavity, and the lower surface of the metal tube shell (4) is provided with a lower inner chamfer (43) of the tube shell cavity. The lower end of the metal tube shell (4) is guided by the matching of the lower inner chamfer (43) of the tube shell cavity, so that the pressure feed head (2) is placed inside the tube shell accommodating cavity (41), and the lower surface of the metal tube shell (4) is sealed and fitted with the upper surface of the pressure feed head limiting groove (24).

5. The ceramic pressure transmitter with easy assembly according to claim 2 is characterized in that The ceramic core (52) is provided with a ceramic core pressure chamber (55) for sealing and measuring medium pressure, and the lower surface of the ceramic core (52) is squeezed and sealed with the top surface of the pressure inlet head (2) through the ceramic sensor sealing O-ring (3).

6. The ceramic pressure transmitter with easy assembly according to claim 4 is characterized in that The rubber bracket (6) is provided with a bracket accommodating cavity (61), the ceramic sensor (5) with an amplifying circuit board is placed in the bracket accommodating cavity (61), the upper surface of the rubber bracket (6) is provided with a bracket outer chamfer (62), the rubber bracket (6) is arranged in the tube shell accommodating cavity (41) through the guidance of the bracket outer chamfer (62), and is sealed and limited on the upper surface of the ceramic core (52).

7. The ceramic pressure transmitter with easy assembly according to claim 6 is characterized in that The metal cover (7) is provided with a metal cover accommodating cavity (71). The diameter of the metal cover (7) is larger than the diameter of the metal cover accommodating cavity (71) and is consistent with the diameter of the metal tube shell (4). The diameter of the metal cover accommodating cavity (71) is consistent with the diameter of the bracket accommodating cavity (61). The lower surface of the metal cover (7) and the upper surface of the metal tube shell (4) are fastened by laser welding. At the same time, the lower surface of the metal cover accommodating cavity (71) and the upper surface of the rubber bracket (6) are squeezed and fixed.

8. The ceramic pressure transmitter with easy assembly according to claim 7 is characterized in that The material of the rubber bracket (6) is fluororubber.

Images