Liquid fuel combustible gas concentration alarm testing device

Abstract

A liquid fuel combustible gas concentration alarm testing device comprises a fuel shell and is characterized in that the fuel shell is cylindrical, a sealing bottom is arranged at one end of the fuel shell, a gas guide pipe is arranged at the center in the fuel shell, a plurality of gas guide holes are evenly distributed in the outer wall of the gas guide pipe, absorbent cotton is arranged in an annular cavity between the gas guide pipe and the fuel shell, and the absorbent cotton is arranged in the annular cavity. The filter is used for adsorbing liquid fuel; a blocking felt is fixed at the upper end of the gas guide pipe in the fuel shell, and vent holes are uniformly distributed in the blocking felt; the upper end of the fuel shell is detachably connected with an upper cover, an inner cavity of the upper cover forms a mixed gas chamber, and the side wall of the upper cover is connected with a test connector; an inflator is coaxially connected to the lower end of the fuel shell, and an inner barrel of the inflator is detachably connected with the sealing bottom at one end of the fuel shell, communicates with an inner hole of the air guide pipe and is used for generating compressed air to enter the air guide pipe. According to the device, combustible gas generated by liquid fuel can be used as signal gas, the liquid fuel volatilization speed is increased, and the testing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a testing device, and more particularly to a testing device for a liquid fuel combustible gas concentration alarm. Background Technology

[0002] The liquid fuel combustible gas alarm testing device is a rapid testing apparatus used to inspect combustible gas concentration alarms installed in liquid fuel production / storage areas. Checking combustible gas concentration alarms during the storage and transportation of liquid fuels such as aviation kerosene is a routine task, aimed at testing the alarm functions and other linkage capabilities of the alarms.

[0003] The traditional method uses other combustible gases as test samples, such as readily available and stable single-component fuels like butane, isobutane, and propane. This simulates the volatile gases emitted during a liquid fuel leak, purging the probe of the combustible gas concentration alarm to trigger the alarm and simulate a leak. This method has the following problems:

[0004] 1. Using sample gas to replace the volatile oil and gas of aviation kerosene cannot fully represent the characteristics of liquid fuels and cannot fully meet the industry's standards for combustible gas concentration alarm detection.

[0005] 2. For many storage facilities and remote areas where sample gas may not be readily available, it is better to use liquid fuels, which can be sourced locally, and use the local detection samples to test the combustible gas concentration alarms in the area.

[0006] 3. Sample gases are not easy to store. The storage of combustible gases requires a specific warehouse, and two or more combustible gases cannot be stored in the same area.

[0007] To address the discrepancy between the test sample gas and the detection signal gas, a common solution is to fill a wide-mouthed bottle with liquid fuel and place it under the probe of the combustible gas concentration alarm for inspection, or to use other testing devices. While this solves the problem of mismatch between the signal gas and the sample gas, some liquid fuels are non-volatile and may take a long time to reach the alarm threshold. Since a testing area may have anywhere from a dozen to dozens of concentration alarms, this significantly impacts work efficiency. Some testing devices directly use liquid fuel as a medium, and there is a risk of accidentally contaminating the combustible gas alarm during operation, which could trigger continuous alarms and create a safety hazard. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a liquid fuel combustible gas concentration alarm testing device that can use liquid fuel to generate combustible gas as a signal gas, accelerate the evaporation rate of liquid fuel, and improve testing efficiency.

[0009] The technical solution of this utility model is as follows:

[0010] A liquid fuel combustible gas concentration alarm testing device includes a fuel shell, which is cylindrical and has a sealed bottom at one end. A gas guide tube is provided at the center of the fuel shell, and a number of gas guide holes are evenly distributed on the outer wall of the gas guide tube. Degreased cotton is provided in the annular cavity between the gas guide tube and the fuel shell for absorbing liquid fuel. A sealing felt is fixed at the upper end of the gas guide tube inside the fuel shell, and the sealing felt has evenly distributed vent holes.

[0011] A top cover is detachably connected to the upper end of the fuel casing. The inner cavity of the top cover forms a mixing chamber. A test connector is connected to the side wall of the top cover for spraying out the mixed gas.

[0012] An air pump is coaxially connected to the lower end of the fuel housing. The inner cylinder of the air pump is detachably connected to the bottom seal at one end of the fuel housing and communicates with the inner hole of the air guide pipe to generate compressed air to enter the air guide pipe.

[0013] As a further preferred embodiment, the bottom seal and the fuel housing are an integral structure, with a stepped central hole at the center of the bottom seal and an internal thread inside the outer port of the central hole, so as to facilitate the connection of the air guide pipe and the inner cylinder of the air pump.

[0014] As a further preferred embodiment, an annular boss is provided on the outer edge of the lower end of the air guide tube, and the annular boss is used to seal and clamp the air guide tube into the center hole of the bottom. The upper end of the inner cylinder of the air pump is connected to the center hole of the bottom by a thread and presses against the lower end of the air guide tube to improve air tightness.

[0015] As a further preferred option, sealing rings are provided between the annular boss at the lower end of the air guide tube and between the upper end of the inner cylinder of the air pump and the center hole of the bottom seal, respectively, to improve airtightness.

[0016] As a further preferred embodiment, the sealing felt is secured to the upper end of the vent pipe by a screw passing through its center, so as to facilitate removal and addition of liquid fuel.

[0017] As a further preferred embodiment, the test connector is a T-shaped connector, with one end inserted into the mixing chamber and fixed to the side wall of the upper cover by a pair of locking nuts and a sealing gasket.

[0018] As a further preferred embodiment, the air pump includes an outer cylinder and an inner cylinder. Sealing caps are connected to both ends of the outer cylinder. The lower end of the inner cylinder passes through the sealing cap at the upper end of the outer cylinder and is inserted into the outer cylinder. A piston is fixed at the lower end of the inner cylinder. A sealing ring is fitted in the annular groove in the middle of the outer edge of the piston, and the width of the annular groove is greater than the thickness of the sealing ring, so that the sealing ring can slide up and down in the annular groove when the outer cylinder is pushed and pulled. The sealing ring is interference-fitted with the inner wall of the outer cylinder. Two trapezoidal grooves are symmetrically provided on the annular protrusion at the lower end of the piston to guide gas between the piston and the sealing cap at the lower end of the outer cylinder.

[0019] As a further preferred option, one-way valves are provided at both ends of the central hole of the inner cylinder to prevent liquid fuel from flowing back into the air pump and corroding the sealing ring.

[0020] The beneficial effects of this utility model are:

[0021] 1. Using degreased cotton to absorb liquid fuel as the source of sample gas facilitates the use of local materials, solves the problem of inconsistency between sample gas and signal gas, fully demonstrates the characteristics of liquid fuel, and fully meets the industry's detection standards for combustible gas concentration alarms; at the same time, it avoids leakage and splashing problems caused by the use of liquid fuel in various application scenarios.

[0022] 2. Compressed air generated by the air pump enters the air guide tube and is sprayed into the fuel shell through several air guide holes. It can fully mix with the liquid fuel adsorbed by the degreased cotton and accelerate the evaporation rate of the liquid fuel, thereby improving the testing efficiency.

[0023] 3. By sealing the fuel casing cavity and mixing chamber with felt, fuel splashing can be effectively prevented and the mixture can be made purer. Attached Figure Description

[0024] Figure 1 This is a structural cross-sectional view of the present invention.

[0025] Figure 2 yes Figure 1 Top view.

[0026] Figure 3 yes Figure 1 A partial sectional view of AA.

[0027] In the diagram: 1. Top cover; 2. Screw; 3. Sealing felt; 4. Degreased cotton; 5. Air guide pipe; 6. Fuel housing; 7. One-way valve; 8. Sealing ring; 9. Piston; 901. Trapezoidal groove; 10. Inner cylinder; 11. Outer cylinder; 12. Sealing cap; 13. Sealing ring; 14. Test connector; 15. Locking nut. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] like Figures 1-3 As shown, the present invention relates to a liquid fuel combustible gas concentration alarm testing device, comprising a fuel housing 6, which is cylindrical and has a sealed bottom 601 at one end. A gas guide tube 5 is fixed at the center inside the fuel housing 6, and a plurality of gas guide holes 501 are evenly distributed on the outer wall of the gas guide tube 5. Degreased cotton 4 is inserted into the annular cavity between the gas guide tube 5 and the fuel housing 6 for absorbing liquid fuel. A sealing felt 3 is fixed at the upper end of the gas guide tube 5 inside the fuel housing 6, and a plurality of vent holes are evenly distributed on the circumference of the sealing felt 3.

[0030] The bottom seal 601 and the fuel housing 6 are either an integral structure or separate structures connected by threads; this embodiment uses an integral structure as an example. A stepped central hole is provided in the center of the bottom seal 601, and an internal thread is provided inside the outer port of the central hole to facilitate connection between the air guide pipe 5 and the inner cylinder of the air pump. An annular boss is provided on the lower outer edge of the air guide pipe 5, and it is sealed and fastened to the central hole of the bottom seal by the annular boss.

[0031] A top cover 1 is detachably connected to the upper end of the fuel housing 6 via threads. The inner cavity of the top cover 1 forms a mixing chamber. A test connector 14 is connected to the side wall of the top cover 1 for spraying out the mixed gas. An air pump is coaxially connected to the lower end of the fuel housing 6. The inner cylinder 10 of the air pump is detachably connected to the bottom seal at one end of the fuel housing 6 and communicates with the inner hole of the air guide pipe 5 to generate compressed air to enter the air guide pipe 5.

[0032] The upper end of the inner cylinder 10 of the air pump is threaded to the center hole of the bottom seal and rests against the lower end of the air guide pipe 5 to improve air tightness. Sealing rings 13 are respectively provided between the annular boss at the lower end of the air guide pipe 5 and between the upper end of the inner cylinder 10 of the air pump and the center hole of the bottom seal to improve air tightness.

[0033] The sealing felt 3 is fixed to the upper end of the gas duct 5 by a screw 2 passing through its center, so as to facilitate disassembly and addition of liquid fuel. The test connector 14 is a T-shaped connector, one end of which is inserted into the mixing chamber and fixed to the side wall of the upper cover 1 by a pair of locking nuts 15 and a sealing gasket.

[0034] The air pump includes an outer cylinder 11 and an inner cylinder 10. Sealing caps 12 are threaded to both ends of the outer cylinder 11. The lower end of the inner cylinder 10 passes through the sealing cap 12 at the upper end of the outer cylinder 11 and is inserted into the outer cylinder 11. A piston 9 is fixed to the lower end of the inner cylinder 10. A sealing ring 8 is fitted into an annular groove in the middle of the outer edge of the piston 9, and the width of the annular groove is greater than the thickness of the sealing ring 8, allowing the sealing ring 8 to slide up and down within the annular groove when the outer cylinder 11 is pushed or pulled. The sealing ring 8 is interference-fitted with the inner wall of the outer cylinder 11. Two trapezoidal grooves 901 are symmetrically provided on the annular protrusion at the lower end of the piston 9 to guide gas between the piston 9 and the sealing cap 12 at the lower end of the outer cylinder 11.

[0035] One-way valves 7 are threadedly connected to both ends of the center hole of the inner cylinder 10, so that compressed air can only reach the air guide pipe 5 from the air pump through the inner cylinder 10, to prevent liquid fuel from flowing back into the air pump and corroding the sealing ring; air inlets are evenly distributed around the circumference of the sealing cover 12 at the upper end of the outer cylinder 11, so that gas can be drawn in when the outer cylinder 11 is pushed or pulled.

[0036] In use, the test connector 14 of the device is brought close to the combustible gas concentration alarm. The outer cylinder 11 of the air pump is pushed and pulled back and forth to draw air into the outer cylinder 11 and compress it. The compressed air is then forced into the air guide pipe 5 through the two one-way valves and the inner cylinder 10 and ejected from the air guide hole 501 on the air guide pipe 5. This allows the compressed air to be fully mixed with the liquid fuel absorbed in the degreased cotton 4, generating a large amount of positive pressure mixed gas that gathers into the mixed gas chamber through the vent holes of the perforated sealing felt 3 and is ejected through the test connector 14. This causes the concentration of the combustible gas concentration alarm to rise rapidly to the alarm value, achieving the purpose of the test.

[0037] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A liquid fuel combustible gas concentration alarm tester device comprising a fuel housing, characterized by: The fuel shell is cylindrical and has a bottom at one end. A gas guide pipe is arranged in the center of the fuel shell. A plurality of gas guide holes are uniformly distributed on the outer wall of the gas guide pipe. Absorbent cotton is arranged in the annular cavity between the gas guide pipe and the fuel shell to absorb liquid fuel. A blocking felt is fixed at the upper end of the gas guide pipe in the fuel shell. The blocking felt has uniformly distributed air permeable holes. An upper cover is detachably connected to the upper end of the fuel shell. The inner cavity of the upper cover forms a mixed gas chamber. A test connector is connected to the side wall of the upper cover to spray mixed gas. A pump is coaxially connected to the lower end of the fuel shell. The inner cylinder of the pump is detachably connected to the bottom of the fuel shell and communicates with the inner hole of the gas guide pipe to generate compressed air into the gas guide pipe.

2. The liquid fuel combustible gas concentration alarm tester of claim 1, wherein: The bottom and the fuel shell are integrated. A stepped center hole is arranged in the center of the bottom. An internal thread is arranged in the outer port of the center hole to facilitate the connection of the gas guide pipe and the inner cylinder of the pump.

3. The liquid fuel combustible gas concentration alarm tester of claim 2 wherein: An annular boss is arranged at the outer edge of the lower end of the gas guide pipe and is sealed and clamped in the center hole of the bottom. The upper end of the inner cylinder of the pump is threadedly connected to the center hole of the bottom and is in abutment with the lower end of the gas guide pipe to improve air tightness.

4. The liquid fuel combustible gas concentration alarm test device of claim 3, wherein: Sealing rings are arranged between the annular boss at the lower end of the gas guide pipe and the upper end of the inner cylinder of the pump and the center hole of the bottom to improve air tightness.

5. The liquid fuel combustible gas concentration alarm test device of claim 1, wherein: The blocking felt is fixed to the upper end of the gas guide pipe by a screw passing through the center to facilitate disassembly and addition of liquid fuel.

6. The liquid fuel combustible gas concentration alarm test device of claim 1, wherein: The test connector is a tee-shaped connector. One end of the connector is inserted into the mixed gas chamber and is fixed to the side wall of the upper cover by a pair of locking nuts and sealing pads.

7. The liquid fuel combustible gas concentration alarm test device of claim 1, wherein: The pump includes an outer cylinder and an inner cylinder. Sealing covers are connected to the two ends of the outer cylinder. The inner cylinder is inserted into the outer cylinder through the sealing cover at the upper end of the outer cylinder. A piston is fixed to the lower end of the inner cylinder. A sealing ring is sleeved in the annular groove at the middle of the outer edge of the piston. The width of the annular groove is greater than the thickness of the sealing ring, so that the sealing ring can slide up and down in the annular groove when the outer cylinder is pushed and pulled. The sealing ring is in interference fit with the inner wall of the outer cylinder. Two trapezoidal grooves are symmetrically arranged on the annular boss at the lower end of the piston to guide gas between the piston and the sealing cover at the lower end of the outer cylinder.

8. The liquid fuel combustible gas concentration alarm tester of claim 7 wherein: One-way valves are arranged at the two ends of the center hole of the inner cylinder to prevent liquid fuel from flowing back into the pump and corroding the sealing ring.

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