Pressure-stabilizing portable gas detection module

Abstract

The pressure-stabilizing portable gas detection module is provided with a diaphragm pump, a diaphragm pump gas inlet pipe, a diaphragm pump gas outlet pipe, a gas storage tank, a circuit board, a gas sensor, a filter valve, a gas storage tank gas outlet pipe, a gas chamber and a diffusion gas-permeable membrane; the diaphragm pump is connected with a diaphragm pump air inlet pipe and a diaphragm pump air outlet pipe; the other end of the diaphragm pump air inlet pipe is connected with a filter valve; the diaphragm pump air outlet pipe is connected with the air storage tank; the other end of the air storage tank air outlet pipe crosses over the circuit board and is connected with the air chamber; gas sensors are arranged on the circuit board and between the gas chambers; air holes are formed in the air chamber, and a diffusion breathable film is mounted in the air chamber; a pressure stabilizing valve composed of a spring, a movable plate and a partition plate is arranged in the exhaust tank. Gas sucked by the diaphragm pump is subjected to pressure stabilization through the gas storage tank and then flows into the gas chamber to be detected by the sensor, so that the gas pressure is stabilized at the optimal working pressure of the sensor, and the pulsation influence of the pressure of the gas output by the diaphragm pump is eliminated, thereby ensuring the metering performance of the gas detector and improving the detection precision.

Description

(I) Technical field

[0001] The utility model relates to the technical field of gas detectors, in particular to a voltage-stabilizing portable gas detection module of a pump-suction type portable gas detector. (II) Background technology

[0002] In today's society, environmental problems are becoming increasingly prominent, and people need to detect harmful gases in real time. The instruments currently used to detect harmful gases mainly include: diffusion gas detectors, pump-type gas detectors, and fixed gas detectors. Different harmful gases use different instruments. The harmful gas detection parameters are displayed on the instrument screen, and an alarm will be issued when a certain threshold is exceeded.

[0003] In order to isolate the flammable and explosive gases in the surrounding environment and prevent the leakage of toxic and harmful gases, pump-suction gas detectors usually use gas diaphragm pumps. The working principle of the diaphragm pump determines that the output gas pressure has pulsation. Some precision gas sensors, such as electrochemical sensors, are extremely sensitive to pressure changes. Pulsating pressure will make the sensor output signal unstable, affecting the accuracy of the measurement.

[0004] At the same time, the sensors of portable gas detectors generally operate near standard atmospheric pressure, while the gas pressure output from a diaphragm pump is often higher. If it comes into direct contact with the sensor, the sensor output current will increase, which will not only shorten the life of the sensor, but also amplify the impact of the diaphragm pump output pressure pulsation, making it difficult to ensure the stability of the measurement.

[0005] Therefore, the prior art has the above defects. The patent application number is CN202111252385.7, entitled "A pressure-limited gas chamber structure for a pump-type portable gas detector", has made the following improvements:

[0006] This patent discloses a pressure-limiting air chamber structure of a pump-suction portable gas detector, including a shell, a plurality of air chambers arranged inside the shell, and a damping chamber connected to an air supply device, wherein the air inlet of the damping chamber is connected to the air supply device, and the exhaust port of the damping chamber is respectively connected to the plurality of air chambers, and the exhaust port of the damping chamber and the air chamber are located in different planes, and a sensor for gas detection is also installed corresponding to any of the air chambers, and the sensor is installed on a PCB board, and the air chamber is also provided with a pressure-limiting hole for discharging gas. The technical solution of the utility model improves the air chamber structure of the existing gas detector, keeps the air chamber pressure within the rated working pressure range of the sensor, and reduces the pulsation effect of the gas pressure output by the diaphragm pump, so as to ensure the metering performance of the gas detector.

[0007] This patent can only reduce the pulsation effect of the gas pressure output by the diaphragm pump, but cannot completely eliminate the gas pressure pulsation.

[0008] Therefore, it is necessary to develop a pressure-stabilized portable gas detection module that can completely eliminate the pressure pulsation of the diaphragm pump output gas. (III) Contents of the utility model

[0009] The utility model aims to provide a portable gas detection module with a stable pressure, so as to stabilize the gas pressure at the optimal working pressure of the sensor and eliminate the pulsation effect of the gas pressure output by the diaphragm pump to ensure the metering performance of the gas detector.

[0010] In order to achieve the above-mentioned purpose, the utility model proposes a voltage-stabilized portable gas detection module, including a diaphragm pump, a diaphragm pump air inlet pipe, a diaphragm pump air outlet pipe, a gas storage tank, a circuit board, a gas sensor, a filter valve, a gas storage tank air outlet pipe, an air chamber, and a diffusion breathable membrane; the diaphragm pump is connected to the diaphragm pump air inlet pipe and the diaphragm pump air outlet pipe;

[0011] The other end of the diaphragm pump air inlet pipe is connected to the filter valve; the diaphragm pump air outlet pipe is connected to the gas storage tank; the other end of the gas storage tank is the gas tank outlet pipe, and the other end of the gas tank outlet pipe crosses the circuit board to connect to the air chamber; a gas sensor is installed on the circuit board and between the air chambers;

[0012] The air chamber is provided with air holes and a diffusion air-permeable membrane is installed inside; the air storage tank is composed of an exhaust tank and an intake tank; the exhaust tank is provided with a pressure-stabilizing valve composed of a spring, a movable plate and a partition.

[0013] Compared with the prior art, the beneficial effects of the utility model are: it optimizes the gas supply path of the sensor of the existing gas detector, adds a gas storage tank between the diaphragm pump and the air chamber, so that the gas sucked in by the diaphragm pump passes through the gas storage tank for pressure stabilization and then flows into the air chamber for sensor detection, so that the gas pressure is stabilized at the optimal working pressure of the sensor, and the pulsation effect of the gas pressure output by the diaphragm pump is eliminated, thereby ensuring the metering performance of the gas detector and improving the detection accuracy. (IV) Description of the drawings

[0014] The specific structure of the utility model is given by the following embodiments and the accompanying drawings:

[0015] Attached Figure 1 It is a rear isometric view of the utility model voltage-stabilized portable gas detection module.

[0016] Attached Figure 2 It is a front isometric view of a voltage-stabilized portable gas detection module of the utility model.

[0017] Attached Figure 3 It is an axial side view of the gas path of the voltage-stabilized portable gas detection module of the utility model.

[0018] Attached Figure 4 It is a sectional view of the gas path axial side view of the voltage-stabilized portable gas detection module of the utility model.

[0019] Wherein: (1) a diaphragm pump, (2) an air inlet pipe of the diaphragm pump, (3) an air outlet pipe of the diaphragm pump, (4) an air storage tank, (5) a circuit board, (6) a gas sensor, (7) a filter valve, (8) an air outlet pipe of the air storage tank, (9) an air chamber, and (10) a diffusion gas permeable membrane;

[0020] (41) exhaust tank, (42) suction tank, (43) connecting pipe, (44) spring, (45) movable plate, (46) partition.

[0021] See attached Figure 1 :The diaphragm pump (1) is connected to a diaphragm pump air inlet pipe (2) and a diaphragm pump air outlet pipe (3); the other end of the diaphragm pump air inlet pipe (2) is connected to a filter valve (7); the diaphragm pump air outlet pipe (3) is connected to a gas storage tank (4); the other end of the gas storage tank (4) is a gas storage tank air outlet pipe (8), and the other end of the gas storage tank air outlet pipe (8) crosses the circuit board (5) and is connected to the air chamber (9); a gas sensor (6) is installed between the circuit board (5) and the air chamber (9).

[0022] See attached Figure 2 : The air chamber (9) has an air hole (91) and a diffusion air-permeable membrane (10) is installed inside.

[0023] See attached Figure 3 The gas path of the pressure-stabilized portable gas detection module is composed of a filter valve (7), a diaphragm pump air inlet pipe (2), a diaphragm pump air outlet pipe (3), a gas storage tank (4) and a gas storage tank air outlet pipe (8); the gas storage tank (4) is composed of an exhaust tank (41) and an intake tank (42).

[0024] See attached Figure 4 The exhaust tank (41) and the air intake tank (42) are connected by a connecting pipe (43); the exhaust tank (41) is provided with a pressure stabilizing valve composed of a spring (44), a movable plate (45) and a partition (46). (V) Specific implementation methods

[0025] According to the attached Figure 1 , Attachment Figure 2 As shown, install the components and install them in the portable gas detector, and perform the following operations:

[0026] Pump suction detection: The diaphragm pump (1) is started, and the ambient gas enters the gas storage tank (4) through the filter valve (7), the diaphragm pump air inlet pipe (2), the diaphragm pump (1), and the diaphragm pump exhaust pipe (3) for pressure stabilization. When the gas pressure reaches the set value, the pressure stabilizing valve composed of the spring (44), the movable plate (45) and the partition (46) is turned on; the gas enters the gas chamber (9) through the gas storage tank outlet pipe (8); and then enters the gas sensor (6) on the circuit board (5) for detection.

[0027] Diffusion detection: ambient gas enters the gas chamber (9) through the diffusion gas-permeable membrane (10), and then enters the gas sensor (6) on the circuit board (5) for detection.

[0028] The utility model has the following characteristics: the gas pressure is stabilized at the optimal working pressure of the sensor, and the pulsation effect of the gas pressure output by the diaphragm pump can be eliminated, thereby ensuring the metering performance of the gas detector and improving the detection accuracy.

Claims

1. A voltage-stabilized portable gas detection module, characterized in that The voltage-regulated portable gas detection modules are: Diaphragm pump (1), diaphragm pump air inlet pipe (2), diaphragm pump air outlet pipe (3), gas storage tank (4), circuit board (5), gas sensor (6), filter valve (7), gas storage tank air outlet pipe (8), air chamber (9), and diffuser and breathable membrane (10); An exhaust tank (41), an air intake tank (42), a connecting pipe (43), a spring (44), a movable plate (45), and a partition plate (46).

2. The voltage-stabilized portable gas detection module according to claim 1, characterized in that: The air chamber (9) is provided with an air hole (91) and a diffusion air-permeable membrane (10) is installed inside.

3. The voltage-stabilized portable gas detection module according to claim 1, characterized in that: The gas storage tank (4) is composed of an exhaust tank (41) and an intake tank (42).

4. The voltage-stabilized portable gas detection module according to claim 1, characterized in that: The exhaust tank (41) and the suction tank (42) are connected via a connecting pipe (43).

5. The voltage-stabilized portable gas detection module according to claim 1, characterized in that: A pressure-stabilizing valve composed of a spring (44), a movable plate (45) and a partition plate (46) is arranged in the exhaust tank (41).

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