An automatic zero calibration system for a combustible gas detector

Abstract

The utility model relates to combustible gas detector technical field, concretely relates to an automatic zero point correction system for combustible gas detector, including shell and protection subassembly, the inboard fixed mounting of shell has display screen, protection subassembly includes elastic link, protection frame, transparent plate and dialing lever, the shell has the accommodation cavity, the accommodation cavity has the strip shape opening, one end of elastic link is fixedly connected with the shell, the other end of elastic link is fixedly connected with protection frame, and elastic link is located the inside of accommodation cavity, and transparent plate is fixedly connected with protection frame, and transparent plate is located the inboard of protection frame, and dialing lever is fixedly connected with protection frame, and dialing lever is slidably arranged in the strip shape opening, and protection frame can slide in the inside of accommodation cavity, and elastic link supports protection frame, makes transparent plate can be in the top of display screen to protect display screen to solve the problem that display screen is directly exposed to air, is vulnerable to damage.

Description

Technical Field

[0001] This utility model relates to the field of combustible gas detector technology, and in particular to an automatic zero-point calibration system for combustible gas detectors. Background Technology

[0002] Combustible gas refers to substances that can be ignited and exist in a gaseous state at normal temperature and pressure. When combustible gases are mixed in a certain proportion in a suitable combustion-supporting medium, they can cause combustion or explosion under the action of an ignition source. However, the detection accuracy of existing combustible gas detectors is not high.

[0003] Utility model patent CN203275345U discloses a combustible gas detector, including a combustible gas sensor and a housing. The housing has a central cavity and a rear cavity. The central cavity has a display window communicating with the outside of the housing. A processing unit circuit board, a power supply circuit board, and a display unit circuit board are all located in the central cavity, with the display unit circuit board close to the display window. The display unit circuit board is connected to a display screen, which is located in the display window. The combustible gas sensor is connected to a wiring unit circuit board, which is connected to the power supply circuit board. The power supply circuit board is connected to the processing unit circuit board, and the processing unit circuit board is connected to the display unit circuit board. The combustible gas sensor and an external reference bridge together form a Wheatstone bridge structure. When combustible gas is present, the detection element oxidizes the combustible gas, and the resulting heat raises the temperature of the detection element, causing a change in its resistance. This change creates a voltage difference with the reference bridge, and this voltage difference is proportional to the concentration of the combustible gas. The concentration of combustible gas is obtained by detecting this voltage difference. By connecting multiple internal circuit boards, the concentration detected by the sensor is quickly processed and displayed, so that the concentration of combustible gas can be accurately measured.

[0004] The above method displays the detection results of combustible gas concentration directly on the screen, but the screen is directly exposed to the air and is easily damaged. Utility Model Content

[0005] The purpose of this invention is to provide an automatic zero-point calibration system for combustible gas detectors, which solves the problem that the display screen is directly exposed to the air and is easily damaged.

[0006] To achieve the above objectives, this utility model provides an automatic zero-point calibration system for a combustible gas detector, comprising a housing in which a combustible gas concentration detection zero-point calibration system is internally installed, a display screen for displaying combustible gas concentration fixedly installed on the inner side of the housing, and a protective assembly including an elastic rod, a protective frame, a transparent plate, and a toggle lever. The housing has a receiving cavity with a strip-shaped opening. One end of the elastic rod is fixedly connected to the housing, and the other end is fixedly connected to the protective frame. The elastic rod is located inside the receiving cavity. The transparent plate is fixedly connected to the protective frame and is located inside the protective frame. The toggle lever is fixedly connected to the protective frame and is slidably disposed in the strip-shaped opening.

[0007] The protective component further includes a slider, which is fixedly connected to the actuating rod. The slider is located at the end of the actuating rod away from the protective frame, and the slider is slidably connected to the outer shell.

[0008] The slider has limit brackets on both sides, and the outer shell has a limit groove that is adapted to the limit brackets. The limit brackets are located inside the limit grooves.

[0009] The elastic rod includes a fixed rod, a spring, and a movable rod. One end of the fixed rod is fixedly connected to the outer shell, one end of the movable rod is slidably connected to the other end of the fixed rod, and the other end of the movable rod is fixedly connected to the protective frame. The two ends of the spring are fixedly connected to the fixed rod and the movable rod, respectively, and the spring is located inside the fixed rod.

[0010] The protective component also includes a rubber strip, which is fixedly connected to the protective frame and is located on the side of the protective frame away from the movable rod.

[0011] This invention relates to an automatic zero-point calibration system for a combustible gas detector. The protective frame is used to install the transparent plate. The protective frame can slide inside the receiving cavity. The elastic rod supports the protective frame, allowing the transparent plate to be positioned above the display screen to protect the display screen, thereby solving the problem that the display screen is directly exposed to the air and is easily damaged. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1This is a schematic diagram of the structure of an automatic zero-point calibration system for a combustible gas detector according to the present invention.

[0014] Figure 2 This is a structural cross-sectional view of an automatic zero-point calibration system for a combustible gas detector according to this utility model.

[0015] Figure 3 This invention relates to an automatic zero-point calibration system for combustible gas detectors. Figure 2 The structural cross-sectional view at point AA.

[0016] 100-Outer shell, 110-Receiving cavity, 120-Strip opening, 130-Limiting groove, 200-Display screen, 310-Protective frame, 320-Transparent plate, 330-Toggle lever, 340-Slider, 341-Limiting bracket, 351-Fixing rod, 352-Spring, 353-Moving rod, 360-Rubber strip. Detailed Implementation

[0017] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0018] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of an automatic zero-point calibration system for a combustible gas detector according to this utility model. Figure 2 This is a structural cross-sectional view of an automatic zero-point calibration system for a combustible gas detector according to this utility model. Figure 3 This invention relates to an automatic zero-point calibration system for combustible gas detectors. Figure 2 The structural cross-sectional view at point AA.

[0019] This utility model provides an automatic zero-point calibration system for a combustible gas detector, including a housing 100 in which a combustible gas concentration detection zero-point calibration system is installed internally and a protective component. A display screen 200 for displaying the combustible gas concentration is fixedly installed on the inner side of the housing 100. The protective component includes an elastic rod, a protective frame 310, a transparent plate 320, a toggle rod 330, a slider 340, and a rubber strip 360. The elastic rod includes a fixed rod 351, a spring 352, and a movable rod 353.

[0020] In this specific embodiment, the outer casing 100 has a receiving cavity 110 with a strip-shaped opening 120. One end of the elastic rod is fixedly connected to the outer casing 100, and the other end is fixedly connected to the protective frame 310. The elastic rod is located inside the receiving cavity 110. The transparent plate 320 is fixedly connected to the protective frame 310 and is located inside the protective frame 310. The actuating rod 330 is fixedly connected to the protective frame 310 and is slidably disposed in the strip-shaped opening 120. A combustible gas concentration detection zero-point calibration system is installed in the outer casing 100. The zero-point calibration system includes an MCU, a multiplexer analog switch, a resistor network, and a Wheatstone bridge. The resistor network is connected to the data input terminal of the multiplexer analog switch, the output terminal of the multiplexer analog switch is connected to the Wheatstone bridge, and the address input terminal of the multiplexer analog switch is connected to the MCU. The MCU's PA, PB, and PC terminals are connected to the address input terminals A, B, and C of the multiplexer analog switch. Controlled by the MCU, different parallel resistor values ​​are selected for the sensitive and matching elements of the Wheatstone bridge. The Wheatstone bridge consists of four arms: r1 is the sensor element, r2 is the matching element, and R1 and R2 are the balancing resistors for the bridge in fresh air. At balance, the ratio of r1 to r2 is equal to the ratio of R1 to R2. The resistor network consists of nine resistors, Ra to Ri, which are connected to the data input terminals of the multiplexer analog switch. Resistors Ra to Ri provide different parallel resistances for the sensitive and matching elements of the Wheatstone bridge, enabling the bridge to reach a new balance and complete calibration. The detection results of the zero-point calibration system are displayed on the display screen 200. The protective component is used to protect the display screen 200. The transparent plate 320 is transparent, and the protective frame 310 is used to install the transparent plate 320. The protective frame 310 can slide inside the receiving cavity 110. The elastic rod supports the protective frame 310, so that the transparent plate 320 can be positioned above the display screen 200 to protect it, thereby solving the problem that the display screen 200 is directly exposed to the air and is easily damaged. The detection results displayed on the display screen 200 can be read directly through the transparent plate 320, and the transparent plate 320 can also be moved away to read the results. The toggle lever 330 is fixed to the protective frame 310. The protective frame 310 can be slid by the toggle lever 330, thereby moving the transparent plate 320 away from above the display screen 200 to expose the display screen 200, thus allowing operation of the display screen 200.

[0021] Furthermore, the slider 340 is fixedly connected to the actuating lever 330, with the slider 340 located at the end of the actuating lever 330 away from the protective frame 310, and the slider 340 is slidably connected to the outer casing 100. The slider 340 is provided on the actuating lever 330, allowing workers to slide the actuating lever 330 via the slider 340, facilitating movement of the actuating lever 330 within the strip-shaped opening 120, thereby moving the transparent plate 320 to expose the display screen 200.

[0022] Specifically, the slider 340 has limit brackets 341 on both sides, and the outer shell 100 has a limiting groove 130 that matches the limit bracket 341. The limit bracket 341 is located inside the limiting groove 130. The limit bracket 341 can slide in the limiting groove 130, and the limit bracket 341 and the limiting groove 130 cooperate with each other to limit the position of the slider 340.

[0023] One end of the fixed rod 351 is fixedly connected to the outer casing 100, one end of the movable rod 353 is slidably connected to the other end of the fixed rod 351, and the other end of the movable rod 353 is fixedly connected to the protective frame 310. Both ends of the spring 352 are fixedly connected to the fixed rod 351 and the movable rod 353 respectively, and the spring 352 is located inside the fixed rod 351. The movable rod 353 can slide relative to the fixed rod 351, and the spring 352 supports the movable rod 353, ensuring that the transparent plate 320 remains above the display screen 200 to protect it when no external force is applied.

[0024] In addition, the rubber strip 360 is fixedly connected to the protective frame 310, and the rubber strip 360 is located on the side of the protective frame 310 away from the movable rod 353. The rubber strip 360 is provided on the side of the protective frame 310 to protect the protective frame 310, and in turn protect the transparent plate 320, so as to prevent the protective frame 310 from being easily damaged by impact.

[0025] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. An automatic zero-point calibration system for a combustible gas detector, comprising a housing in which a combustible gas concentration detection zero-point calibration system is internally installed, wherein a display screen for displaying the combustible gas concentration is fixedly installed on the inner side of the housing, characterized in that, It also includes protective components; The protective assembly includes an elastic rod, a protective frame, a transparent plate, and a lever. The outer shell has a receiving cavity with a strip-shaped opening. One end of the elastic rod is fixedly connected to the outer shell, and the other end of the elastic rod is fixedly connected to the protective frame. The elastic rod is located inside the receiving cavity. The transparent plate is fixedly connected to the protective frame and is located inside the protective frame. The lever is fixedly connected to the protective frame and is slidably disposed in the strip-shaped opening.

2. The automatic zero-point calibration system for a combustible gas detector as described in claim 1, characterized in that, The protective component also includes a slider, which is fixedly connected to the actuating lever. The slider is located at the end of the actuating lever away from the protective frame, and is slidably connected to the outer shell.

3. The automatic zero-point calibration system for a combustible gas detector as described in claim 2, characterized in that, Limiting brackets are provided on both sides of the slider, and the outer shell has a limiting groove adapted to the limiting bracket, with the limiting bracket located inside the limiting groove.

4. The automatic zero-point calibration system for a combustible gas detector as described in claim 1, characterized in that, The elastic rod includes a fixed rod, a spring, and a movable rod. One end of the fixed rod is fixedly connected to the outer shell, one end of the movable rod is slidably connected to the other end of the fixed rod, and the other end of the movable rod is fixedly connected to the protective frame. The two ends of the spring are fixedly connected to the fixed rod and the movable rod, respectively, and the spring is located inside the fixed rod.

5. The automatic zero-point calibration system for a combustible gas detector as described in claim 4, characterized in that, The protective component also includes a rubber strip, which is fixedly connected to the protective frame and is located on the side of the protective frame away from the movable rod.

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