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] The present invention relates to a testing device, and particularly to a testing device for a combustible gas concentration alarm of liquid fuel. Background Art

[0002] The testing device for a combustible gas alarm of liquid fuel is a rapid testing device for detecting a combustible gas concentration alarm disposed in a liquid fuel production / storage area. During the storage and transportation of liquid fuels such as aviation kerosene, inspecting the combustible gas concentration alarm is a daily task, aiming to test the alarm and other linkage functions of the combustible gas concentration alarm.

[0003] The traditional method is to use other combustible gases as test sample gases for testing. For example, single-component fuels such as butane, isobutane, and propane, which are both easily available and stable, are used as sample gases to blow the probe part of the combustible gas concentration alarm by imitating the volatile gas during liquid fuel leakage to reach the alarm value and simulate leakage alarm. 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 fuel and cannot fully meet the detection standards of the combustible gas concentration alarm in this industry;

[0005] 2. For many storage depots and remote areas, it may be difficult to obtain sample gas. It is better to directly use liquid fuel, which can be obtained locally, and use the detection samples in this area to detect the combustible gas concentration alarm in this area.

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

[0007] To solve the problem that the test sample gas is different from the detection signal gas, the conventional solution is to use a flared bottle filled with liquid fuel and place it under the probe of the combustible gas concentration alarm for inspection, or use other testing devices for testing. Although this operation solves the problem that the signal gas does not match the sample gas, some liquid fuels have the characteristic of being not easy to volatilize and it takes a long time to reach the alarm value of the combustible gas concentration alarm. There are at least a dozen and at most dozens of concentration alarms in a test area, which has a great impact on work efficiency. Some testing devices directly use liquid fuel as a medium, and there may be a risk of accidentally contaminating the combustible gas alarm with liquid fuel during the operation, which will cause continuous alarm and pose a hidden danger to safety production. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a test device for a liquid fuel combustible gas concentration alarm, which can use liquid fuel to generate combustible gas as a signal gas, accelerate the evaporation rate of the liquid fuel, and improve the test efficiency.

[0009] The technical solution of the present invention is as follows:

[0010] A test device for a liquid fuel combustible gas concentration alarm, comprising a fuel housing. The fuel housing is cylindrical and has a bottom seal at one end. A gas guide pipe is provided at the center of the fuel housing. A number of gas guide holes are evenly distributed on the outer wall of the gas guide pipe. Absorbent cotton is provided in the annular cavity between the gas guide pipe and the fuel housing for adsorbing liquid fuel; A sealing felt is fixed at the upper end of the gas guide pipe in the fuel housing, and air permeable holes are evenly distributed on the sealing felt;

[0011] An upper cover is detachably connected to the upper end of the fuel housing. The inner cavity of the upper cover forms a mixed gas chamber. A test joint is connected to the side wall of the upper cover for ejecting the mixed gas;

[0012] A pump is coaxially connected to the lower end of the fuel housing. The inner cylinder of the pump is detachably connected to the bottom seal at one end of the fuel housing and communicated with the inner hole of the gas guide pipe for generating compressed air to enter the gas guide pipe.

[0013] As a further preference, the bottom seal and the fuel housing are of an integral structure. A stepped central hole is provided at the center of the bottom seal, and an internal thread is provided in the outer port of the central hole to facilitate the connection of the gas guide pipe and the inner cylinder of the pump.

[0014] As a further preference, an annular boss is provided at the outer edge of the lower end of the gas guide pipe, and the gas guide pipe is hermetically clamped in the central hole of the bottom seal through the annular boss; The upper end of the inner cylinder of the pump is threadedly connected to the central hole of the bottom seal and abuts against the lower end of the gas guide pipe to improve airtightness.

[0015] As a further preference, sealing rings are respectively provided 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 central hole of the bottom seal to improve airtightness.

[0016] As a further preference, the sealing felt is fixed to the upper end of the gas guide pipe through a screw passing through its center to facilitate disassembly and addition of liquid fuel.

[0017] As a further preference, the test joint is in a three-way shape, and one end of it is inserted into the mixed gas chamber and fixed to the side wall of the upper cover through a pair of locking nuts and a gasket.

[0018] As a further preference, the air pump includes an outer cylinder and an inner cylinder. Sealing caps are respectively 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 inserts into the outer cylinder. A piston is fixed to the lower end of the inner cylinder. A sealing ring is sleeved 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 or pulled; the sealing ring is in interference fit with the inner wall of the outer cylinder. Two trapezoidal grooves are symmetrically provided on the annular boss at the lower end of the piston to introduce gas between the piston and the sealing cap at the lower end of the outer cylinder.

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

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. Using absorbent cotton to adsorb liquid fuel as the generating source of the sample gas is convenient for obtaining materials locally, solves the problem that the sample gas does not match the signal gas, can fully display the characteristics of the liquid fuel, and completely meets the detection standards of the combustible gas concentration alarm in this industry; at the same time, it avoids the leakage and splashing problems caused by the use of liquid fuel in various usage scenarios.

[0022] 2. The compressed air generated by the air pump enters the air guide pipe and is ejected into the fuel housing through a number of air guide holes, which can be fully mixed with the liquid fuel adsorbed by the absorbent cotton and accelerate the evaporation speed of the liquid fuel, improving the test efficiency.

[0023] 3. By using the plugging felt to isolate the inner cavity of the fuel housing from the mixing gas chamber, it can effectively prevent fuel splashing and make the mixing gas purer. Description of the Drawings

[0024] Figure 1 is the structural sectional view of the present invention.

[0025] Figure 2 is Figure 1 the top view of

[0026] Figure 3 is Figure 1 the partial sectional view taken along A-A of

[0027] In the figure: upper cover 1, screw 2, plugging felt 3, absorbent cotton 4, air guide pipe 5, fuel housing 6, one-way valve 7, sealing ring 8, piston 9, trapezoidal groove 901, inner cylinder 10, outer cylinder 11, sealing cap 12, sealing ring 13, test joint 14, lock nut 15. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] As Figures 1 to 3 shown, a test device for a liquid fuel combustible gas concentration alarm involved in the present invention includes a fuel housing 6. The fuel housing 6 is cylindrical and has a bottom seal 601 at one end. A gas guide pipe 5 is fixed at the center inside the fuel housing 6. A plurality of gas guide holes 501 are evenly distributed on the outer wall of the gas guide pipe 5. Absorbent cotton 4 is stuffed into the annular cavity between the gas guide pipe 5 and the fuel housing 6 for adsorbing liquid fuel. A sealing felt 3 is fixed at the upper end of the gas guide pipe 5 inside the fuel housing 6, and a plurality of air holes are evenly distributed in a circumferential direction on the sealing felt 3.

[0030] The bottom seal 601 and the fuel housing 6 are of an integral structure or a split structure and are connected by threads. In this embodiment, the integral structure is taken as an example. A stepped central hole is provided at the center of the bottom seal 601, and an internal thread is provided in the outer port of the central hole to facilitate the connection of the gas guide pipe 5 and the inner cylinder of the air pump. An annular boss is provided at the outer edge of the lower end of the gas guide pipe 5, and the gas guide pipe is hermetically clamped in the central hole of the bottom seal through the annular boss.

[0031] An upper cover 1 is detachably connected to the upper end of the fuel housing 6 by threads. A mixed gas chamber is formed in the inner cavity of the upper cover 1. A test joint 14 is connected to the side wall of the upper 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 is communicated with the inner hole of the gas guide pipe 5 for generating compressed air to enter the gas guide pipe 5.

[0032] The upper end of the inner cylinder 10 of the air pump is connected to the central hole of the bottom seal by threads and abuts against the lower end of the gas guide pipe 5 to improve airtightness. Sealing rings 13 are respectively provided between the annular boss at the lower end of the gas guide pipe 5 and the upper end of the inner cylinder 10 of the air pump and the central hole of the bottom seal to improve airtightness.

[0033] The sealing felt 3 is fixed to the upper end of the gas guide pipe 5 through a screw 2 passing through its center to facilitate disassembly and addition of liquid fuel. The test joint 14 is in a three-way shape, one end of which is inserted into the mixed gas chamber and is fixed to the side wall of the upper cover 1 through 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 respectively connected to both ends of the outer cylinder 11 by threads. 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 sleeved in the 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, so that the sealing ring 8 can slide up and down in the annular groove when the outer cylinder 11 is pushed and pulled; the sealing ring 8 is in interference fit with the inner wall of the outer cylinder 11. Two trapezoidal grooves 901 are symmetrically arranged on the annular boss at the lower end of the piston 9 to introduce 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 respectively connected to both ends of the central hole of the inner cylinder 10 by threads, so that compressed air can only pass through the inner cylinder 10 of the air pump to reach the air duct 5, to prevent the liquid fuel from flowing back into the air pump to corrode the sealing ring; air inlet holes are evenly distributed in a circle on the sealing cap 12 at the upper end of the outer cylinder 11 to inhale gas when the outer cylinder 11 is pushed and pulled.

[0036] During use, the test joint 14 of the device is brought close to the combustible gas concentration alarm. The outer cylinder 11 of the air pump is reciprocally pushed and pulled to draw air into the outer cylinder 11 and compress it. Then, the compressed air is pressed into the air duct 5 through the two one-way valves and the inner cylinder 10 and sprayed out from the air guide holes 501 on the air duct 5, so that the compressed air is fully mixed with the liquid fuel absorbed in the absorbent cotton 4, generating a large amount of positive-pressure mixed gas. The mixed gas converges into the mixing gas chamber through the air permeable holes of the punched and sealed felt 3 and is sprayed out through the test joint 14, so that the concentration of the combustible gas concentration alarm is quickly increased to the alarm value to achieve the purpose of testing.

[0037] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the description and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A test device for the concentration alarm of combustible gas in liquid fuel, comprising a fuel housing, characterized in that: The fuel housing is cylindrical and has a bottom seal at one end. A gas guide pipe is provided at the center of the fuel housing. A number of gas guide holes are evenly distributed on the outer wall of the gas guide pipe. Absorbent cotton is provided in the annular cavity between the gas guide pipe and the fuel housing for adsorbing liquid fuel. A sealing felt is fixed at the upper end of the gas guide pipe in the fuel housing. The sealing felt is evenly distributed with air holes. An upper cover is detachably connected to the upper end of the fuel housing. The inner cavity of the upper cover forms a mixed gas chamber. A test joint is connected to the side wall of the upper cover for ejecting the mixed gas. A pump is coaxially connected to the lower end of the fuel housing. The inner cylinder of the pump is detachably connected to the bottom seal at one end of the fuel housing and communicates with the inner hole of the gas guide pipe for generating compressed air to enter the gas guide pipe.

2. The liquid fuel combustible gas concentration alarm testing device according to claim 1, characterized in that: The bottom seal and the fuel housing are of an integral structure. A stepped central hole is provided at the center of the bottom seal and an internal thread is provided in the outer port of the central 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 testing device according to claim 2, wherein: An annular boss is provided at the outer edge of the lower end of the gas guide pipe and is hermetically clamped in the central hole of the bottom seal through the annular boss. The upper end of the inner cylinder of the pump is threadedly connected to the central hole of the bottom seal and abuts against the lower end of the gas guide pipe to improve airtightness.

4. The liquid fuel combustible gas concentration alarm testing device according to claim 3, characterized in that: Sealing rings are respectively provided 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 central hole of the bottom seal to improve airtightness.

5. The liquid fuel combustible gas concentration alarm testing device according to claim 1, characterized in that: The sealing felt is fixed to the upper end of the gas guide pipe through a screw passing through its center to facilitate disassembly and addition of liquid fuel.

6. The liquid fuel combustible gas concentration alarm testing device according to claim 1, characterized in that: The test joint is in a three-way shape. One end of it is inserted into the mixed gas chamber and fixed to the side wall of the upper cover through a pair of locking nuts and a gasket.

7. The liquid fuel combustible gas concentration alarm testing device according to claim 1, wherein: The pump includes an outer cylinder and an inner cylinder. Sealing covers are respectively connected to both ends of the outer cylinder. The lower end of the inner cylinder passes through the sealing cover 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 sleeved 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 in interference fit with the inner wall of the outer cylinder. Two trapezoidal grooves are symmetrically provided on the annular boss at the lower end of the piston to guide the gas between the piston and the sealing cover at the lower end of the outer cylinder.

8. The liquid fuel combustible gas concentration alarm testing device according to claim 7, characterized in that: One-way valves are respectively provided at both ends of the central hole of the inner cylinder to prevent the liquid fuel from flowing back into the pump to corrode the sealing ring.

Images