Waterproof and moistureproof reliable pressure transmitter

Abstract

The utility model discloses a waterproof moistureproof reliable pressure transmitter, which comprises a pressure inlet head assembly, an oil filling core body, a plastic support, an amplification circuit board, a metal tube shell and a metal tube shell cover, the oil filling core body is arranged in a pressure inlet head accommodating cavity at the upper part of the pressure inlet head assembly, and the plastic support is arranged on the upper surface of the pressure inlet head assembly. The amplifying circuit board is arranged in an upper support containing cavity of the plastic support, the metal tube shell is arranged on the upper portion of the pressing head inlet assembly, the plastic support is arranged in a lower tube shell containing cavity of the metal tube shell, a glass sintering base assembly is arranged in an upper tube shell containing cavity of the metal tube shell, and a signal pin T with the tail end inserted into the female pin base is arranged on the glass sintering base assembly. And a ventilation catheter is arranged between the two signal needles T. According to the utility model, the sealing O-shaped ring B and the inner wall of the accommodating cavity on the metal tube shell are extruded to realize waterproof sealing of the shell, and the gas-guide tube sleeve with the waterproof gas-permeable membrane is additionally arranged to prevent water from entering the transmitter from the gas-guide tube, so that the pressure transmitter can work in a high-humidity environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of instruments and meters, and particularly relates to a waterproof, moisture-proof and reliable pressure transmitter. Background Art

[0002] A pressure transmitter is a device that converts pressure into pneumatic or electrical signals for control and transmission. It is one of the most common sensors used in today's industrial fields. Because many pressure transmitters operate year-round in harsh environments such as outdoor, humid, or underwater, moisture entering the pressure transmitter may affect the transmitter's accuracy and stability. Moisture intrusion can also cause corrosion of the transmitter's metal casing and internal components, reducing the pressure transmitter's service life. Therefore, the transmitter's waterproof performance has become a major concern, and waterproof protection has become a major problem during the production and use of transmitters.

[0003] Currently, the most common waterproofing designs for pressure transmitters on the market involve installing a gasket on the transmitter housing to create a seal with the cable. This sealing method doesn't achieve ideal waterproofing, primarily due to large diameter variations in the cable and the inability to achieve a perfect circular shape. This results in a large gap between the cable and the gasket, preventing a tight fit and significantly compromising the transmitter's waterproofing effectiveness. 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 waterproof and moisture-proof reliable pressure transmitter, which has the characteristics of high processing precision, guaranteed sealing performance and the ability of the pressure transmitter to operate in an environment with high humidity.

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

[0006] A waterproof, moisture-proof and reliable pressure transmitter comprises a pressure inlet head assembly, an oil-filled core, a plastic bracket, an amplifying circuit board, a metal tube shell, a glass sintering seat assembly, a metal tube shell cover and an air guide tube sleeve assembly. The upper part of the pressure inlet head assembly is provided with a pressure inlet head accommodating chamber, the oil-filled core is arranged in the pressure inlet head accommodating chamber, and the top surface of the oil-filled core is provided with two oil-filled core signal needles S. The plastic bracket is fitted on the upper surface of the pressure inlet head assembly, the upper part of the plastic bracket is provided with an upper bracket accommodating chamber, the lower part of the plastic bracket is provided with a lower bracket accommodating chamber, the upper bracket accommodating chamber and the lower bracket accommodating chamber are connected to each other, the amplifying circuit board is arranged in the upper bracket accommodating chamber, and the position of the amplifying circuit board corresponding to the oil-filled core signal needle S is provided with an amplifying circuit board connecting hole, and two female needle seats are provided between the two amplifying circuit board connecting holes. The oil-filled core signal needle S passes through the lower bracket accommodating chamber and penetrates into the amplifying circuit board connecting hole and The metal tube shell is fixed by welding, and the upper part of the metal tube shell is provided with an upper tube shell accommodating cavity, and the lower part of the metal tube shell is provided with a lower tube shell accommodating cavity. The upper tube shell accommodating cavity and the lower tube shell accommodating cavity are communicated with each other, and the plastic bracket and the amplifying circuit board are installed in the lower tube shell accommodating cavity. The glass sintering seat assembly is installed in the upper tube shell accommodating cavity, and a signal pin T is provided at the position corresponding to the female pin seat on the glass sintering seat assembly. An upward ventilation duct is provided between the two signal pins T, and the air guide tube sleeve assembly is provided on the top of the ventilation duct. The end of the signal pin T is inserted into the female pin seat and fixed by welding. The metal tube shell cover is sleeved on the upper part of the metal tube shell, and the metal tube shell cover is provided with a metal cover opening. The top end of the signal pin T extends out of the upper tube shell accommodating cavity and is located in the metal cover opening. The top end of the signal pin T is welded with a signal line, and the top surface of the glass sintering seat assembly and the metal cover opening are poured with sealant.

[0007] Preferably, the pressure inlet head assembly includes a pressure inlet head, a sealing O-ring A and a hexagonal lower surface of the pressure inlet head. A pressure inlet head pressure-conducting cavity for transmitting medium pressure is provided in the pressure inlet head. A pressure inlet head limiting groove is symmetrically provided on the outer wall of the pressure inlet head. The bottom surface of the metal tube shell is welded to the pressure inlet head limiting groove through tooling, and the sealing O-ring A is arranged on the hexagonal lower surface of the pressure inlet head.

[0008] Preferably, the cross section of the metal tube shell is convex.

[0009] Preferably, the glass sintering seat assembly includes a glass sintering seat and a sealing O-ring B. The glass sintering seat is provided with a sintering seat metal shell. A sintering seat O-ring groove is symmetrically provided on the middle part of the outer wall of the sintering seat metal shell. The sealing O-ring B is arranged in the sintering seat O-ring groove so that the sealing O-ring B is squeezed and sealed with the inner wall of the accommodating cavity on the tube shell.

[0010] Preferably, the two ends of the signal pin T extend out of the top and bottom surfaces of the sintering seat metal shell respectively, and both sides of each signal pin T are sealed in the sintering seat metal shell by glass extrusion. The bottom surface of the sintering seat metal shell is provided with a glass sintering seat chamfer, and the glass sintering seat assembly is arranged in the accommodating cavity on the tube shell through the glass sintering seat chamfer guide.

[0011] Preferably, the metal tube shell cover is provided with a tube shell cover accommodating cavity, the height of the tube shell cover accommodating cavity is consistent with the height of the upper protrusion of the metal tube shell, the inner diameter of the tube shell cover accommodating cavity is consistent with the inner diameter of the lower accommodating cavity of the tube shell, and tube shell limiting grooves are provided on both sides of the upper protrusion of the metal tube shell. The lower surface of the metal cover opening is sealed and welded to the tube shell limiting groove, so that the upper surface of the tube shell cover accommodating cavity is squeezed with the upper surface of the glass sintering seat assembly, and the glass sintering seat assembly is fixed in the upper accommodating cavity of the tube shell.

[0012] Preferably, the airway tube sleeve assembly includes a waterproof breathable membrane and an airway tube sleeve, the waterproof breathable membrane is adhered to the upper surface of the airway tube sleeve, the bottom surface of the airway tube sleeve is provided with an airway tube sleeve opening, and the airway tube sleeve opening is provided with an airway tube sleeve opening chamfer, and the airway tube sleeve is guided by the airway tube sleeve opening chamfer and installed on the top of the ventilation catheter.

[0013] The beneficial effects of the utility model are as follows: the utility model uses the sealing O-ring B on the glass sintering seat to squeeze the inner wall of the accommodating cavity on the tube shell to achieve waterproof sealing of the pressure transmitter. The processing accuracy of the workpiece is relatively high, and the waterproof performance is greatly improved compared with the shell being equipped with a gasket and the cable to squeeze for sealing. Finally, sealant is filled on the upper part of the glass sintering seat for sealing, which further enhances the waterproof performance and enables the pressure transmitter to work in an environment with high humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is an exploded view of the inlet pressure head assembly of the utility model;

[0016] Figure 3 This is a schematic diagram of the oil-filled core in the present invention;

[0017] Figure 4 This is a schematic diagram of the plastic bracket in the present utility model;

[0018] Figure 5 This is a schematic diagram of an enlarged circuit board in the present invention;

[0019] Figure 6 It is a schematic diagram of the metal tube shell in the present utility model;

[0020] Figure 7 This is an exploded view of the glass frit assembly in the present invention;

[0021] Figure 8 It is a schematic diagram of the metal tube shell cover in the present utility model;

[0022] Figure 9This is an exploded view of the airway sleeve assembly of the present invention;

[0023] In the figure, 1, pressure head assembly; 2, oil-filled core; 3, plastic bracket; 4, amplifier circuit board; 5, metal tube shell; 6, glass sintering seat assembly; 7, metal tube shell cover; 8, air guide tube sleeve assembly; 11, pressure head; 12, sealing O-ring A; 111, hexagonal lower surface of pressure head; 112, pressure head limiting groove; 113, pressure head pressure guide cavity; 114, pressure head accommodating cavity; 21, oil-filled core signal pin S; 31, upper accommodating cavity of bracket; 32, lower accommodating cavity of bracket; 41, female needle seat; 42, amplifier circuit board connection Connecting hole; 51, upper accommodating cavity of tube shell; 52, lower accommodating cavity of tube shell; 53, limiting groove of tube shell; 61, glass sintering seat; 62, sealing O-ring B; 63, signal line; 611, sintering seat metal shell; 612, glass; 613, signal pin T; 614, sintering seat O-ring groove; 615, ventilation duct; 616, chamfer of glass sintering seat; 71, metal cover opening; 72, tube shell cover accommodating cavity; 81, waterproof and breathable membrane; 82, air guide tube sleeve; 821, air guide tube sleeve opening; 822, chamfer of air guide tube sleeve opening. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] like Figure 1-9 As shown, the utility model is a waterproof, moisture-proof and reliable pressure transmitter including a pressure inlet head assembly 1, an oil-filled core 2, a plastic bracket 3, an amplifying circuit board 4, a metal tube shell 5, a glass sintered seat assembly 6, a metal tube shell cover 7 and an air guide tube sleeve assembly 8; a pressure inlet head accommodating cavity 114 is provided on the upper part of the pressure inlet head assembly 1, and the oil-filled core 2 is arranged in the pressure inlet head accommodating cavity 114, wherein the volume of the oil-filled core 2 matches the volume of the pressure inlet head accommodating cavity 114.

[0026] The top surface of the oil-filled core 2 in the utility model is provided with two oil-filled core signal needles S 21, and the plastic bracket 3 is fitted on the upper surface of the pressure head assembly 1. The upper part of the plastic bracket 3 is provided with a bracket upper accommodating cavity 31, and the lower part of the plastic bracket 3 is provided with a bracket lower accommodating cavity 32. The bracket upper accommodating cavity 31 and the bracket lower accommodating cavity 32 are communicated with each other. The amplifier circuit board 4 is arranged in the bracket upper accommodating cavity 31, and the amplifier circuit board 4 is provided with an amplifier circuit board connecting hole 42 at the position corresponding to the oil-filled core signal needle S 21. Two female needle seats 41 are provided between the two amplifier circuit board connecting holes 42. The oil-filled core signal needle S21 passes through the bracket lower accommodating cavity 32 and is welded and fixed, so that the amplifier circuit board 4, the plastic bracket 3 and the oil-filled core 2 are fixed and signal connected.

[0027] The metal tube shell 5 of the present invention is mounted on the upper portion of the pressure inlet head assembly 1. The metal tube shell 5 has a convex cross-section and is provided with an upper tube shell accommodating chamber 51 at its upper portion and a lower tube shell accommodating chamber 52 at its lower portion. The upper tube shell accommodating chamber 51 and the lower tube shell accommodating chamber 52 are interconnected. The plastic bracket 3 and the amplifier circuit board 4 are mounted within the lower tube shell accommodating chamber 52. The glass frit seat assembly 6 is mounted within the upper tube shell accommodating chamber 51. A signal pin T613 is mounted on the glass frit seat assembly 6 at a position corresponding to the female pin seat 41. An upward-facing ventilation conduit 615 is positioned between the two signal pins T613. The air guide tube assembly 8 is mounted on top of the ventilation conduit 615 to prevent external water from entering the interior of the pressure transmitter. The distal end of the signal pin T613 is inserted into the female pin seat 41 and secured by welding.

[0028] The metal tube shell cover 7 of the present invention is sleeved on the upper part of the metal tube shell 5. The metal tube shell cover 7 is provided with a metal cover opening 71. The top end of the signal pin T613 extends out of the housing cavity 51 on the tube shell and is located in the metal cover opening 71. The top end of the signal pin T613 is welded to the signal wire 63. The top surface of the glass frit seat assembly 6 and the metal cover opening 71 are filled with sealant.

[0029] The pressure inlet head assembly 1 in the present invention includes a pressure inlet head 11, a sealing O-ring A12 and a hexagonal lower surface 111 of the pressure inlet head. A pressure inlet head pressure-guiding cavity 113 for transmitting medium pressure is provided in the pressure inlet head 11. A pressure inlet head limiting groove 112 for limiting the insertion depth of the lower end of the metal tube shell 5 is symmetrically provided on the outer wall of the pressure inlet head 11. The bottom surface of the metal tube shell 5 is welded to the pressure inlet head limiting groove 112 by tooling, and the sealing O-ring A12 is arranged on the hexagonal lower surface 111 of the pressure inlet head.

[0030] The glass sintering seat assembly 6 in the present invention includes a glass sintering seat 61 and a sealing O-ring B62. The glass sintering seat 61 is provided with a sintering seat metal shell 611. A sintering seat O-ring groove 614 is symmetrically provided on the middle part of the outer wall of the sintering seat metal shell 611. The sealing O-ring B62 is arranged in the sintering seat O-ring groove 614, so that the sealing O-ring B62 is squeezed and sealed with the inner wall of the accommodating cavity 51 on the tube shell to achieve sealing of the pressure transmitter and prevent water from entering the interior of the pressure transmitter.

[0031] The two ends of the signal pin T613 in the present invention extend out of the top and bottom surfaces of the sintering seat metal shell 611 respectively. Both sides of each signal pin T613 are squeezed and sealed in the sintering seat metal shell 611 by glass 612. The bottom surface of the sintering seat metal shell 611 is provided with a glass sintering seat chamfer 616. The glass sintering seat assembly 6 is guided by the glass sintering seat chamfer 616 and set in the accommodating cavity 51 on the tube shell.

[0032] The metal tube shell cover 7 in the present invention is provided with a tube shell cover accommodating cavity 72. The height of the tube shell cover accommodating cavity 72 is consistent with the height of the upper protrusion of the metal tube shell 5. The inner diameter of the tube shell cover accommodating cavity 72 is consistent with the inner diameter of the tube shell lower accommodating cavity 52. ​​Tube shell limiting grooves 53 are provided on both sides of the upper protrusion of the metal tube shell 5. The lower surface of the metal cover opening 71 is sealed and welded to the tube shell limiting grooves 53, so that the upper surface of the tube shell cover accommodating cavity 72 is squeezed against the upper surface of the glass sintering seat assembly 6, and the glass sintering seat assembly 6 is fixed in the tube shell upper accommodating cavity 51.

[0033] The airway tube sleeve assembly 8 in the present invention includes a waterproof breathable membrane 81 and an airway tube sleeve 82. The waterproof breathable membrane 81 is adhered to the upper surface of the airway tube sleeve 82. The bottom surface of the airway tube sleeve 82 is provided with an airway tube sleeve opening 821. The airway tube sleeve opening 821 is provided with an airway tube sleeve opening chamfer 822. The airway tube sleeve 82 is guided by the airway tube sleeve opening chamfer 822 and installed on the top of the ventilation tube 615.

[0034] The use process of this utility model is as follows:

[0035] Assembly of the pressure transmitter: First, set the sealing O-ring A12 on the hexagonal lower surface 111 of the pressure inlet head, place the oil-filled core 2 inside the pressure inlet head accommodating cavity 114, and then fit the plastic bracket 3 on the upper surface of the pressure inlet head assembly 1, and install the amplifier circuit board 4 to the upper accommodating cavity 31 of the bracket. The two oil-filled core signal pins S21 pass through the lower accommodating cavity 32 of the bracket and penetrate into the amplifier circuit board connection hole 42 and are welded and fixed, so that the amplifier circuit board 4, the plastic bracket 3 and the oil-filled core 2 are fixed and connected to the signal; further, the bottom surface of the metal tube shell 5 is welded to the pressure inlet head limit groove 112 through tooling.

[0036] Then, the sealing O-ring B62 is set in the O-ring groove 614 of the sintering seat, and the lower surface of the glass sintering seat 61 is in contact with the lower surface of the upper accommodating cavity 51 of the tube shell, so that the sealing O-ring B62 is squeezed and sealed with the inner wall of the upper accommodating cavity 51 of the tube shell; then the lower surface of the metal cover opening 71 is sealed and welded with the tube shell limiting groove 53, so that the upper surface of the tube shell cover accommodating cavity 72 is squeezed with the upper surface of the glass sintering seat assembly 6, and the glass sintering seat assembly 6 is fixed in the upper accommodating cavity 51 of the tube shell, further, the end of the signal needle T613 is inserted into the female needle seat 41 and welded to fix it, so that the sensor signal is led out of the sensor housing, and the signal line 63 is welded to the top of the signal needle T613, and finally the air guide tube sleeve 82 is guided through the chamfer 822 of the air guide tube sleeve opening and installed on the top of the ventilation duct 615. At this point, the transmitter assembly is completed.

[0037] This design primarily utilizes the sealing O-ring B62 to squeeze against the inner wall of the housing cavity 51 on the shell to achieve a waterproof seal for the shell. An air guide tube sleeve 82 with a waterproof, breathable membrane 81 is also installed to prevent moisture from entering the pressure transmitter through the ventilation duct 615. Finally, sealant is poured onto the top surface of the glass frit assembly 6 and into the metal cover opening 71 to enhance the sealing of the pressure transmitter.

[0038] Other undescribed parts of the present invention are the same as those in the prior art.

Claims

1. A waterproof, moisture-proof and reliable pressure transmitter, characterized by It comprises a pressure head assembly (1), an oil-filled core (2), a plastic bracket (3), an amplifying circuit board (4), a metal tube shell (5), a glass sintering seat assembly (6), a metal tube shell cover (7) and an air guide tube sleeve assembly (8), wherein the upper portion of the pressure head assembly (1) is provided with a pressure head accommodating cavity (114), the oil-filled core (2) is arranged in the pressure head accommodating cavity (114), the top surface of the oil-filled core (2) is provided with two oil-filled core signal pins S (21), the plastic bracket (3) is arranged on the upper surface of the pressure head assembly (1), the upper portion of the plastic bracket (3) is provided with a bracket upper accommodating cavity (31), the plastic bracket ( 3) is provided with a lower accommodating cavity (32) of the bracket, the upper accommodating cavity (31) of the bracket is communicated with the lower accommodating cavity (32) of the bracket, the amplifying circuit board (4) is arranged in the upper accommodating cavity (31) of the bracket, the amplifying circuit board connection hole (42) is provided on the amplifying circuit board (4) at a position corresponding to the oil-filled core signal needle S (21), two female needle seats (41) are provided between the two amplifying circuit board connection holes (42), the oil-filled core signal needle S (21) passes through the lower accommodating cavity (32) of the bracket and is inserted into the amplifying circuit board connection hole (42) and is fixed by welding, the metal tube shell (5) is arranged on the pressure inlet head assembly The upper part of the component (1), the upper part of the metal tube shell (5) is provided with an upper tube shell accommodating cavity (51), the lower part of the metal tube shell (5) is provided with a lower tube shell accommodating cavity (52), the upper tube shell accommodating cavity (51) and the lower tube shell accommodating cavity (52) are communicated with each other, the plastic bracket (3) and the amplifying circuit board (4) are installed in the lower tube shell accommodating cavity (52), the glass frit seat assembly (6) is installed in the upper tube shell accommodating cavity (51), the position of the glass frit seat assembly (6) corresponding to the female needle seat (41) is provided with a signal needle T (613), and an upward ventilation duct (613) is provided between the two signal needles T (613). 15), the air guide tube sleeve assembly (8) is arranged on the top of the ventilation tube (615), the end of the signal needle T (613) is inserted into the female needle seat (41) and welded and fixed, the metal tube shell cover (7) is sleeved on the upper part of the metal tube shell (5), the metal tube shell cover (7) is provided with a metal cover opening (71), the top end of the signal needle T (613) extends out of the accommodating cavity (51) on the tube shell and is located in the metal cover opening (71), the top end of the signal needle T (613) is welded with a signal wire (63), and the top surface of the glass sintered seat assembly (6) and located in the metal cover opening (71) are filled with sealant.

2. The waterproof and moisture-proof reliable pressure transmitter according to claim 1 is characterized in that The pressure inlet head assembly (1) comprises a pressure inlet head (11), a sealing O-ring A (12) and a hexagonal lower surface (111) of the pressure inlet head. A pressure inlet head pressure-guiding cavity (113) for transmitting medium pressure is provided in the pressure inlet head (111). A pressure inlet head limiting groove (112) is symmetrically provided on the outer wall of the pressure inlet head (11). The bottom surface of the metal tube shell (5) is welded to the pressure inlet head limiting groove (112) by tooling. The sealing O-ring A (12) is provided on the hexagonal lower surface (111) of the pressure inlet head.

3. The waterproof and moisture-proof reliable pressure transmitter according to claim 1 is characterized in that The cross section of the metal tube shell (5) is convex.

4. The waterproof, moisture-proof and reliable pressure transmitter according to claim 1 is characterized in that The glass sintering seat assembly (6) includes a glass sintering seat (61) and a sealing O-ring B (62). The glass sintering seat (61) is provided with a sintering seat metal shell (611). A sintering seat O-ring groove (614) is symmetrically provided on the middle part of the outer wall of the sintering seat metal shell (611). The sealing O-ring B (62) is arranged in the sintering seat O-ring groove (614) so ​​that the sealing O-ring B (62) is squeezed and sealed with the inner wall of the accommodating cavity (51) on the tube shell.

5. The waterproof, moisture-proof and reliable pressure transmitter according to claim 4 is characterized in that The two ends of the signal needle T (613) extend out of the top surface and the bottom surface of the sintering seat metal shell (611) respectively. Both sides of each signal needle T (613) are squeezed and sealed in the sintering seat metal shell (611) by glass (612). The bottom surface of the sintering seat metal shell (611) is provided with a glass sintering seat chamfer (616). The glass sintering seat assembly (6) is guided by the glass sintering seat chamfer (616) and arranged in the accommodating cavity (51) on the tube shell.

6. The waterproof, moisture-proof and reliable pressure transmitter according to claim 3 is characterized by The metal tube shell cover (7) is provided with a tube shell cover accommodating cavity (72), the height of the tube shell cover accommodating cavity (72) is consistent with the height of the upper protrusion of the metal tube shell (5), the inner diameter of the tube shell cover accommodating cavity (72) is consistent with the inner diameter of the tube shell lower accommodating cavity (52), and tube shell limiting grooves (53) are provided on both sides of the upper protrusion of the metal tube shell (5). The lower surface of the metal cover opening (71) is sealed and welded to the tube shell limiting grooves (53), so that the upper surface of the tube shell cover accommodating cavity (72) is squeezed with the upper surface of the glass sintering seat assembly (6), and the glass sintering seat assembly (6) is fixed in the tube shell upper accommodating cavity (51).

7. The waterproof, moisture-proof and reliable pressure transmitter according to claim 1 is characterized by The airway tube sleeve assembly (8) comprises a waterproof breathable membrane (81) and an airway tube sleeve (82), wherein the waterproof breathable membrane (81) is adhered to the upper surface of the airway tube sleeve (82), and an airway tube sleeve opening (821) is provided on the bottom surface of the airway tube sleeve (82), and an airway tube sleeve opening chamfer (822) is provided at the airway tube sleeve opening (821), and the airway tube sleeve (82) is guided and mounted on the top of the ventilation tube (615) via the airway tube sleeve opening chamfer (822).

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