Combustible gas detection device

Abstract

The utility model belongs to the field of diesel engine detection, and particularly relates to a combustible gas detection device. Comprising a manual three-way valve, two ports of the manual three-way valve are respectively used for sampling, a fuel gas purification device is connected behind the manual three-way valve, a float-type flowmeter used for testing combustible gas flow is connected behind the fuel gas purification device, and the float-type flowmeter is located between the fuel gas purification device and a paper filter. A pumping type leakage detector is connected behind the paper filter; and the fuel gas purification device, the float type flowmeter, the paper filter and the pumping type leakage detector are connected in series on the same branch. The manual three-way valve comprises a port A and a port B, and the port A is connected to the crankcase ventilation sampling port through a hose; and the port B is used for gas sampling calibration. The fuel gas purification device comprises a primary filter and a secondary filter, and the secondary filter is connected to the rear side of the primary filter in series. The combustible gas explosion limit detection device can detect the combustible gas explosion limit and improve the safety.

Description

Technical Field

[0001] The utility model belongs to the field of diesel engine detection, in particular to a combustible gas detection device. Background Art

[0002] With the diversification of energy demands and the demand for energy conservation and emission reduction, the use of dual-fuel diesel engines is becoming increasingly widespread. When operating in gas mode, the unique combustion process causes the combustion and explosion of gas within the cylinder. Due to the inherent structure and operating principle of the diesel engine, a small amount of gas inevitably escapes from the cylinder into the crankcase. Currently, handheld pump-type combustible gas detectors are used to detect combustible gases within the crankcase, requiring manual testing on-site while the diesel engine is operating in gas mode. However, this existing technology has several problems. First, manual measurement can cause gas escape and machine noise, posing a safety hazard. Second, the handheld detector's simple filter mechanism can damage the detector's sensor due to the presence of oil and gas components in the escaping gas, which can damage the detector's sensor over extended use. Furthermore, when gas accumulates in the crankcase to a certain level, reaching the explosion limit, it can cause an explosion, seriously harming equipment and personnel. Furthermore, gas leakage and accumulation can disrupt the normal operating environment within the crankcase, corroding and damaging components within the crankcase, and impacting the normal operation and service life of the diesel engine. Therefore, there is an urgent need for a combustible gas detection device for detecting combustible gas. Utility Model Content

[0003] In order to detect the content of combustible gas inside the crankcase, the utility model proposes a combustible gas detection device. When it is detected that the gas reaches the explosion limit, subsequent measures can be taken to avoid the safety hazards caused by escape.

[0004] In order to achieve the above objectives, this application mainly adopts the following technical means:

[0005] A combustible gas detection device comprises a manual three-way valve, two of the ports of the manual three-way valve being used for sampling respectively; a gas purification device being connected to the rear of the manual three-way valve; a float flowmeter for testing the combustible gas flow being connected to the rear of the gas purification device; the float flowmeter being located between the gas purification device and a paper filter; a pump-suction leak detector being connected to the rear of the paper filter; the gas purification device, float flowmeter, paper filter, and pump-suction leak detector being connected in series on the same branch line.

[0006] Furthermore, the manual three-way valve includes port A and port B, wherein port A is connected to the crankcase air sampling port through a hose; and port B is used for gas sampling calibration.

[0007] Furthermore, the gas purification device includes a primary filter and a secondary filter, and the secondary filter is connected in series to the rear side of the primary filter.

[0008] The utility model has the following beneficial technical effects:

[0009] The manual three-way valve is designed with two ports for sampling. Port A is connected to the crankcase gas sampling port via a hose, making it easy to obtain gas samples from the crankcase, providing a source for subsequent testing. Port B is used for gas sampling and calibration, facilitating regular calibration of the testing equipment, ensuring measurement accuracy and improving the reliability of the entire testing device.

[0010] The gas purification unit consists of a primary filter and a secondary filter connected in series. This design progressively filters the gas extracted from the crankcase, removing any impurities. This impurity removal reduces damage to downstream equipment such as float flowmeters, paper filters, and pump-type leak detectors, extending their service life. It also improves detection accuracy and prevents impurities from interfering with combustible gas detection.

[0011] A float flowmeter, located between the gas purification unit and the paper filter, is used to measure combustible gas flow. Accurately measuring gas flow allows for better control of the speed and volume of gas entering subsequent testing equipment, potentially preventing combustible gas explosions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a specific structure of the utility model;

[0013] Numbers in the figure: 1. Manual three-way valve; 2. Primary filter; 3. Secondary filter; 4. Float flowmeter; 5. Paper filter; 6. Pump-suction leak detector. DETAILED DESCRIPTION

[0014] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0015] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, certain parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, the omission of certain well-known structures and their descriptions in the accompanying drawings is understandable.

[0016] See also Figure 1 The utility model provides a combustible gas detection device which can be used for remote online real-time detection of combustible gas and transmit the data to a monitoring system, and provides a multi-channel filtering device to protect the equipment and improve the accuracy of the measurement.

[0017] First, connect the device. Connect the A port of the manual three-way valve to the diesel engine crankcase ventilation sampling port through a suitable hose, ensuring a tight connection to avoid gas leakage. The B port of the manual three-way valve is used as the gas sampling calibration port for subsequent detection and calibration operations. Behind the manual three-way valve, connect the gas purification device in sequence. The gas purification device consists of a primary filter and a secondary filter. The secondary filter is connected in series to the rear side of the primary filter. This setting can gradually filter and purify the gas collected from the crankcase to remove possible impurities to ensure the accuracy of subsequent detection.

[0018] In this embodiment, a float flowmeter is connected to the rear of the gas purification device. This float flowmeter is used to measure the combustible gas flow rate. During sampling, the flow rate of flowmeter 4 must be maintained between 1 and 1.5. This precise control of the gas flow provides stable gas input conditions for subsequent testing. If the flow rate exceeds the range, the filter device must be inspected and, if necessary, replaced.

[0019] In this embodiment, a paper filter is connected to the rear of the float flowmeter. The paper filter further filters the gas processed by the previous equipment, intercepts tiny impurities, and further purifies the gas, making the gas entering the pump-suction leak detector even purer.

[0020] In this embodiment, a pump-type leak detector is connected behind the paper filter. In gas mode, data collected by the leak detector 6 under different loads is observed. By collecting and analyzing data under different operating conditions, a more comprehensive understanding of the combustible gas situation within the crankcase can be achieved. Furthermore, using port B as a gas sampling and calibration port, the leak detector 6 is regularly calibrated to ensure measurement accuracy and the reliability of test results. When the gas leak detector 6 detects a gas LEL% exceeding 85%, an alarm is sent to the monitoring system, triggering the diesel engine to switch from gas mode to fuel mode.

Claims

1. A combustible gas detection device, characterized in that: The invention comprises a manual three-way valve (1), two ports of which are respectively used for sampling, a gas purification device is connected to the rear of the manual three-way valve (1), a float flowmeter (4) for testing the flow of combustible gas is connected to the rear of the gas purification device, the float flowmeter (4) is located between the gas purification device and a paper filter (5), and a pump-suction type leakage detector (6) is connected to the rear of the paper filter (5); the gas purification device, the float flowmeter (4), the paper filter (5), and the pump-suction type leakage detector (6) are connected in series on the same branch.

2. The combustible gas detection device according to claim 1, characterized in that: The manual three-way valve (1) comprises an A port and a B port, wherein the A port is connected to the crankcase air sampling port via a hose; and the B port is used for gas sampling calibration.

3. The combustible gas detection device according to claim 1, characterized in that: The gas purification device comprises a primary filter (2) and a secondary filter (3), wherein the secondary filter (3) is connected in series to the rear side of the primary filter (2).

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