CN2884363Y - Portable gas detection and alarm instrument - Google Patents

Abstract

A portable gas detection and alarm instrument, comprising a casing, a circuit board assembly, a sensor assembly, a battery assembly and a display panel assembly, the circuit board assembly, the sensor assembly and the battery assembly are all installed in the casing, and the display panel is installed on the top of the casing The battery assembly is composed of a battery, a plastic seat and positive and negative terminals, the plastic seat is directly assembled on the corresponding assembly position of the circuit board assembly, and the positive and negative electrode sheets pass through the via holes and the plastic seat of the battery in turn. Through holes on the circuit board and soldered to the circuit board. When using the utility model, the user can conveniently and vertically read the concentration of the measured gas displayed on the liquid crystal screen, and the connection distance with the main board is short and compact, which avoids the short circuit or damage of the flexible wire connection structure during insertion and disassembly. Faults such as loose plugging; the battery plastic seat is directly welded on the circuit board by welding, which has the advantages of compact structure, simple process operation, firm and reliable connection, and convenient battery disassembly.

Description

Portable gas detection and alarm instrument

technical field

The utility model relates to a portable gas detection and alarm instrument, which is mainly used for continuous detection or monitoring of toxic and harmful gases (carbon monoxide, hydrogen sulfide, hydrogen, chlorine, phosphine, hydrogen chloride, sulfur dioxide, nitrogen oxides, oxygen, ammonia, etc.) gas, formaldehyde, etc.) to provide safety protection for users from physical harm. Widely used in metallurgy, petroleum, chemical industry, pharmaceutical, coal, coking, gas production, municipal engineering and other industries, as well as places that need to detect or monitor toxic and harmful gases in the ambient air.

Background technique

Existing portable gas detection and alarm instrument comprises housing, circuit board assembly, sensor assembly, battery assembly and display panel assembly, and circuit board assembly, sensor assembly and battery assembly are all installed in the housing, and display panel assembly is installed in the front of housing (a side). The detector uses an electrochemical gas sensor as the detection element. When the toxic and harmful gas in the ambient gas diffuses to the gas sensor in the detector, the sensor itself will undergo a chemical reaction and output a microcurrent (nA) signal. This signal is provided to the output circuit after being processed by the sampling, shaping and amplifying unit in the measuring instrument circuit. When the concentration of the gas to be measured reaches the alarm point set by the detector, an audible and visual alarm will be issued, and the concentration value of the gas to be measured will be displayed in digital form, which plays the role of an alarm prompt.

Since the existing portable gas detection and alarm devices are generally hung on the body (such as a belt) or hand-held during use, the display panel is located on the front, and the user is parallel to the line of sight during use, and cannot read the gas without facing the front of the detector. The value of the measured gas concentration is very inconvenient to read; the battery is not directly assembled on the circuit board, but is assembled on the instrument case, and is connected to the circuit board through flexible wires or lugs, resulting in a large structural size of the whole machine , poor assemblability, complex process and other disadvantages; the panel assembly cannot be directly connected to the circuit board assembly, but is connected by a flexible wire, resulting in a loose structure, which is prone to failures such as short circuit or loose insertion during insertion and disassembly.

Contents of the invention

The purpose of this utility model is to provide a portable gas detection and alarm instrument to solve the inconvenient reading of the display panel in the prior art; the battery is connected to the circuit board through a flexible wire or a lug, resulting in a large structural size of the whole machine. Assemblability is poor and the process is complicated; the panel components cannot be directly connected to the circuit board components, but are connected by flexible wires, resulting in a loose structure, which is prone to short circuits or loose connections during insertion and disassembly.

The technical scheme of the utility model is: comprising a casing, a circuit board assembly, a sensor assembly, a battery assembly and a display panel assembly, the circuit board assembly, the sensor assembly and the battery assembly are all installed in the casing, and the feature is that the display panel is installed on the top surface of the casing; the battery assembly is composed of a battery, a plastic seat, and positive and negative electrode tabs, the plastic seat is directly assembled on the corresponding assembly position of the circuit board assembly, and the positive and negative electrode sheets pass through the plastic seat of the battery in turn The vias and the vias on the circuit board are soldered to the circuit board.

The display panel assembly includes a mask, a frame plate, a key switch, a liquid crystal screen and a panel circuit board, the frame plate is embedded with a key switch and a liquid crystal screen, the film is bonded on the surface of the frame plate, the driver of the liquid crystal screen and the rear end of the key switch The three-pin button plug is welded on the panel circuit board located inside the frame board.

After taking the above technical measures, the user can conveniently read the concentration of the measured gas displayed on the LCD screen vertically, and the connection distance with the main board is short and compact, which avoids short circuit or plug-in of the flexible wire connection structure during insertion and removal. Insecure connection and other faults; the battery plastic seat is directly welded on the circuit board by welding, which has the advantages of compact structure, simple process operation, firm and reliable connection, and convenient battery disassembly and assembly.

Description of drawings

Fig. 1 is a longitudinal sectional view of the utility model;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is an enlarged view at B in Fig. 2 .

Detailed ways

Referring to Figures 1 to 4, the utility model includes a housing 5, a circuit board assembly 1, a sensor assembly 2, a battery assembly 3 and a display panel assembly 4, the circuit board assembly 1 and the sensor assembly 2 are installed in the housing 5, and the display The panel assembly 4 is installed on the top surface of the housing 5 . It adopts the structural design that the display panel is located on the top surface of the measuring instrument, which has the characteristics of wide measurement range, good linearity, high sensitivity, strong anti-interference, stable and reliable performance, long service life and convenient operation.

The battery assembly 3 is composed of main components such as a battery plastic seat 31, positive and negative tabs 32, a lithium ion battery 33, etc., and supplies power for the entire circuit. The battery plastic seat 31 is used to install and fix the lithium ion battery 33, and is directly assembled on the corresponding assembly position of the circuit board assembly 1; The holes are assembled, and then the fixed connection with the circuit board assembly 1 is realized by welding. The feature of this structure is that the battery plastic seat 31 is directly assembled and welded on the circuit board by welding, which has the advantages of compact structure, simple process operation, firm and reliable connection, and convenient battery disassembly and assembly.

Described display panel assembly 4 comprises facial film 41, frame board 42, key switch 43, liquid crystal screen 45 and panel circuit board (PCB) 46, and facial film 41 is bonded on the surface of frame board 42, and the built-in key switch of frame board 42 43 and LCD screen 45, the three-pin key plug 44 at the rear end of key switch 43 is welded on the PCB positioned at the inside of frame plate 42, and the corresponding pad hole of PCB is directly welded with the described circuit board assembly.

The display panel assembly 4 of the utility model is located on the top surface of the casing, and the upper end of the casing has a window corresponding to the liquid crystal screen 45 of the circuit board assembly 1, and is used to read information such as the measured gas concentration value and battery power status displayed on the liquid crystal screen . During use, the user can conveniently and visually read the concentration of the measured gas vertically. It has the advantages of compact structure and small volume, especially the intuitive reading of the measured gas concentration.

Claims (2)

1. A portable gas detection and alarm instrument, comprising a housing, a circuit board assembly, a sensor assembly, a battery assembly and a display panel assembly, the circuit board assembly, the sensor assembly and the battery assembly are all installed in the housing, characterized in that: the display The panel is installed on the top surface of the shell; the battery assembly is composed of a battery, a plastic seat, and positive and negative terminals, the plastic seat is directly assembled on the corresponding assembly position of the circuit board assembly, and the positive and negative electrode sheets pass through the battery plastic The via holes on the seat and the via holes on the circuit board are soldered to the circuit board. 2. The portable gas detection and alarm device according to claim 1, characterized in that: the display panel assembly includes a mask, a frame plate, a key switch, a liquid crystal screen and a panel circuit board, and the frame plate is embedded with a key switch and a liquid crystal screen The mask is bonded on the surface of the frame plate, and the driver of the LCD screen and the three-pin key plug at the rear end of the key switch are welded on the panel circuit board positioned at the inside of the frame plate.

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