Front pressure gauge

Abstract

The utility model discloses a front-mounted pressure gauge, which comprises a gauge cover, a main body joint and a lower shell, a square hole is formed in the lower part of the lower shell, and a single-cone movement is mounted in the lower shell; an L-shaped pressure gauge pointer is arranged on a gear shaft on one side of a large clamping plate of the single-cone movement, and the L-shaped pressure gauge pointer synchronously rotates along with the gear shaft of the single-cone movement; a square sealing sleeve is arranged at the square hole of the lower shell; a PCB is installed on the gauge cover, a fixed base is installed on the PCB, four infrared receiving tubes and an infrared transmitting tube are installed in the fixed base, and electric signals are generated through rotation of a pointer of the L-shaped pressure gauge. The signal output is stable, the waterproof and dustproof performance is excellent, and the anti-interference capability is strong.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas pressure measurement and remote transmission instruments, and relates to a compressed natural gas (CNG) pressure gauge which can convert a compressed natural gas (CNG) pressure value into an electrical signal output and remotely transmit the signal. Background Art

[0002] Compressed natural gas pressure gauge, referred to as CNG pressure gauge, is mainly used to measure the pressure value of combustible gas. Its measurement principle is the same as that of a general spring tube pressure gauge. The difference is that the CNG pressure gauge has an additional electrical signal transmission structure, which can transmit the measured pressure value to the display end in the form of an electrical signal.

[0003] Currently, there are no production standards for CNG pressure gauges in China. While a wide variety of standard CNG pressure gauges are available on the market, the addition of an electrical signal transmission structure places relatively high demands on the operating environment of these gauges. Consequently, they suffer from the following major drawbacks: ① Standard CNG pressure gauges have relatively poor anti-interference performance. When used in automobiles, they are subject to significant interference from clutter, which affects transmission accuracy and increases the dynamic and steady-state errors of the electrical signal. ② Existing standard CNG pressure gauges are difficult to use in vehicles. During regular vehicle cleaning or rainy weather, water and dust easily enter the gauge, severely affecting the signal transmission accuracy and visual pressure reading of the CNG pressure gauge, increasing the dynamic and steady-state errors of the signal, and even causing unstable signal output or even no signal. ③ The use of a rear-mounted electrical pressure sensor results in inconsistencies in the accuracy of the pressure gauge's mechanical pointer and the voltage value transmitted, leading to unstable output performance. These drawbacks have severely impacted the quality of standard CNG pressure gauges and hindered the market development of CNG pressure gauges. Summary of the Invention

[0004] The purpose of the utility model is to overcome the drawbacks of the existing technology and provide a front-mounted pressure gauge that can convert the compressed natural gas pressure value into an electrical signal output. It has the advantages of simple structure, reasonable cost, convenient calibration and assembly, stable signal output, excellent full waterproof performance, and strong anti-interference ability.

[0005] The technical solution adopted to achieve the above-mentioned purpose is: a front-mounted pressure gauge, including a cover, a main body joint and a lower shell with a square hole at the bottom, and a single-cone movement is installed in the lower shell; the characteristic is that a PCB board is installed in the cover, a fixed base is installed on the PCB board, and four infrared receiving tubes and an infrared transmitting tube are installed in the fixed base; a wire hole is opened on the side of the cover, and a T-shaped wire protection sleeve is installed at the root of the wire to isolate and seal the root of the wire from the inside and outside of the pressure gauge; a square sealing sleeve is installed at the square hole of the lower shell, and the lower shell and the main body joint are assembled and used by using a card slot through the square sealing sleeve.

[0006] Furthermore, the single-cone movement includes a large plate, a small plate, a sector gear, a hairspring, a pillar, a gear shaft, rivets, a pull tab and a rotating shaft; wherein the large plate and the small plate are fixed by pillars, the hairspring is installed on the gear shaft, the end of the U-shaped tail of the sector gear and the pull tab are connected by rivets, the front end of the U-shaped tail of the sector gear is connected to the rotating shaft, the gear shaft and the rotating shaft are both fixedly mounted on the small plate and the large plate, the large plate is fixed to the upper end of the main body joint, and an L-shaped pressure gauge pointer is installed on the gear shaft on one side of the large plate, and the L-shaped pressure gauge pointer rotates synchronously with the gear shaft of the single-cone movement.

[0007] Furthermore, an explosion-proof safety hole is opened on the back of the lower shell and is equipped with an explosion-proof plug.

[0008] The utility model uses a separately developed and designed PCB board with a fixed base installed to integrate the photoelectric tube. The L-shaped pressure gauge pointer rotates to generate an electrical signal, ensuring zero-error output of the pressure gauge pointer and the electrical signal transmission. It can effectively reduce the indirect impact of mechanical shock in the external environment on the electrical signal, and effectively reduce and lower the problem of pressure accuracy and voltage value asynchrony. At the same time, the electrical part transmits the signal through the photoelectric coupling of the infrared emitting tube. The fluctuation of the input signal and the electromagnetic wave interference of the car have no effect on the output signal. The signal output is stable, which effectively improves the anti-interference ability of the system.

[0009] Compared with the existing technology, the utility model has a simple structure, reasonable cost, easy debugging and assembly, stable performance, long service life, precise mechanical structure coordination, accurate sealing method, ensuring the effectiveness of the seal, strong resistance to automobile electromagnetic wave interference, and can effectively prevent dust and water from entering the pressure gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a side structural diagram of the utility model;

[0011] Figure 2 It is a schematic diagram of the dial case and pointer structure;

[0012] Figure 3 It is a schematic diagram of the fixed base and pointer structure;

[0013] Figure 4 This is a schematic diagram of the structure of the infrared receiving tube and the infrared transmitting tube;

[0014] Figure 5 This is the structure diagram of the pointer of the L-type pressure gauge;

[0015] Figure 6 This is a structural diagram of the fixed base;

[0016] Figure 7 It is a diagram of the structure of the watch face.

[0017] Figure 8 It is a schematic diagram of the single cone movement structure;

[0018] Figure 9 yes Figure 8 AA section view;

[0019] Figure 10 This is the structural diagram of the cover and T-type wire protection sleeve.

[0020] Explanation of the accompanying numbers: 1-lower case, 2-table cover, 3-square sealing sleeve, 4-PCB board, 4-1-fixed base, 4-2-infrared transmitting tube, 4-3-infrared receiving tube, 5-screw, 6-L-type pressure gauge pointer, 7-explosion-proof plug, 8-single cone movement, 8-1-large splint, 8-2-small splint, 8-3-sector gear, 8-4-hairspring, 8-5-pillar, 8-6-gear shaft, 8-7-rivet, 8-8-pull tab, 8-9-rotating shaft, 9-dial, 10-main body joint, 11-T-type wire protection sleeve. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0022] The utility model discloses a front-mounted pressure gauge, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown, it includes an upper shell, a main body joint 10, and a lower shell with a square hole in the lower portion. Both the lower shell 1 and the main body joint 10 are provided with positioning holes. Screws 5 are installed in the mounting positioning holes on the back of the lower shell, and the screws 5 are positioned and pressed together with the lower shell. A square sealing sleeve 3 is installed in the positioning hole of the main body joint 10. The lower shell 1 and the main body joint 10 with a slot are assembled by the square sealing sleeve 3 using the slot positioning and are positioned and pressed together using screws 5. A single-cone movement 8 is installed in the lower shell; the watch face 2 is compressed and sealed by the upper and lower shells.

[0023] An explosion-proof safety hole is opened on the back of the lower shell and is equipped with an explosion-proof plug 7 to safely release pressure in the event of abnormal pressure.

[0024] like Figure 8 and Figure 9As shown, the single-cone movement 8 includes a large splint 8-1, a small splint 8-2, a sector gear 8-3, a hairspring 8-4, a pillar 8-5, a gear shaft 8-6, a rivet 8-7, a pull-tab 8-8, and a rotating shaft 8-9; wherein the large splint 8-1 and the small splint 8-2 are fixed by the pillar 8-5, the hairspring 8-4 is mounted on the gear shaft 8-6, the end of the U-shaped tail of the sector gear 8-3 and the pull-tab 8-8 are connected by the rivet 8-7, the front end of the U-shaped tail of the sector gear is connected to the rotating shaft 8-9, and the gear shaft 8-6 and the rotating shaft 8-9 are both fixedly mounted on the small splint 8-2 and the large splint 8-1.

[0025] The large plate 8-1 of the single-cone movement is fixed to the upper end of the main body joint 10. A dial 9 is installed on the large plate 8-1 of the single-cone movement. An L-shaped pressure gauge pointer 6 is installed on the gear shaft 8-6 on one side of the large plate 8-1. The L-shaped pressure gauge pointer 6 rotates synchronously with the gear shaft 8-6 of the single-cone movement.

[0026] like Figure 7 、 Figure 10 As shown, a wire hole is opened on the side of the cover 2, and a T-shaped wire protection sleeve 11 is installed at the root of the wire to isolate and seal the root of the wire from the inside and outside of the pressure gauge.

[0027] like Figure 4 As shown, a PCB board 4 is mounted on the cover 2, a fixed base 4-1 is mounted on the PCB board, four infrared receiving tubes 4-3 and one infrared transmitting tube 4-2 are mounted in the fixed base 4-1, and an electrical signal is generated by the rotation of the L-shaped pressure gauge pointer.

[0028] In actual work, when the pointer 6 of the L-shaped pressure gauge displays the corresponding pressure value, the corresponding infrared receiving tube 4-3 is turned on according to the current position of the pointer, and a stable signal is transmitted to the display terminal to display the corresponding pressure value. Due to the photoelectric coupling principle of the infrared transmitting tube 4-2, the fluctuation of the input signal has no effect on the output signal, which can effectively improve the anti-interference ability of the system.

Claims

1. A front-mounted pressure gauge, comprising a cover (2), a main body joint (10), and a lower shell (1) with a square hole at the bottom, wherein a single-cone movement (8) is installed in the lower shell; wherein A PCB board (4) is installed in the cover (2), a fixed base (4-1) is installed on the PCB board, and four infrared receiving tubes (4-3) and an infrared transmitting tube (4-2) are installed in the fixed base (4-1); a wire hole is opened on the side of the cover (2), and a T-shaped wire protection sleeve (11) is installed at the root of the wire to isolate and seal the root of the wire from the inside and outside of the pressure gauge; a square sealing sleeve (3) is installed at the square hole of the lower shell, and the lower shell (1) and the main body joint (10) are assembled and used by using a card slot through the square sealing sleeve (3).

2. The front-mounted pressure gauge according to claim 1, wherein: The single cone movement (8) includes a large splint (8-1), a small splint (8-2), a sector gear (8-3), a hairspring (8-4), a pillar (8-5), a gear shaft (8-6), a rivet (8-7), a pull piece (8-8) and a rotating shaft (8-9); wherein the large splint (8-1) and the small splint (8-2) are fixed by the pillar (8-5), the hairspring (8-4) is installed on the gear shaft (8-6), the U-shaped tail end of the sector gear (8-3) and the pull piece (8- 8) is connected by rivets (8-7), the front end of the U-shaped tail of the sector gear is connected to the rotating shaft (8-9), the gear shaft (8-6) and the rotating shaft (8-9) are fixedly mounted on the small splint (8-2) and the large splint (8-1), the large splint (8-1) is fixed to the upper end of the main body joint (10), and an L-shaped pressure gauge pointer (6) is installed on the gear shaft (8-6) on one side of the large splint (8-1), and the L-shaped pressure gauge pointer (6) rotates synchronously with the single-cone movement gear shaft (8-6).

3. The front-mounted pressure gauge according to claim 1, wherein: An explosion-proof safety hole is opened on the back of the lower shell and is equipped with an explosion-proof plug (7).

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