Portable oxygen index tester

Abstract

The utility model provides a portable oxygen index tester which comprises a box body, a box cover and a cushion pad, an air supply assembly is arranged in the box body, an operation panel is arranged on the box cover, an air inlet pipeline is arranged on the operation panel, an adjusting valve is arranged on the air inlet pipeline, an adjusting knob is arranged on the operation panel, and a digital display screen is arranged above the adjusting knob. A combustion cylinder is arranged on one side of the operation panel, a three-way mixer is arranged in the box cover, the air inlet pipeline is connected to the three-way mixer, the three-way mixer is connected with the combustion cylinder, and a display screen is arranged on the operation panel. The test piece combustion and the oxygen index measurement are more convenient and time-saving, the gas supply assembly is directly connected with the gas inlet pipeline on the operation panel, and the gas inlet amount is adjusted through the adjusting valve and the adjusting knob, so that the oxygen index of the test piece can be better measured, the test effect is better, and the display screen is arranged on the operation panel, so that the test efficiency is improved. The oxygen index of the test piece during combustion can be directly observed.

Description

Technical Field

[0001] The utility model relates to the technical field related to oxygen index measurement, in particular to a portable oxygen index tester. Background Art

[0002] The oxygen index (OI) refers to the minimum oxygen concentration required for a material to sustain flaming combustion in an oxygen-nitrogen mixture under specified conditions. It is expressed as the volume percentage of oxygen. A high oxygen index indicates a material that is less flammable, while a low oxygen index indicates a material that readily burns. It is the minimum oxygen concentration, expressed as a volume percentage, required for a material to sustain flaming combustion in an O2-N2 mixture under specified test conditions and at room temperature. A higher oxygen index indicates better flame retardancy.

[0003] The flame retardant properties of a material are generally expressed by the oxygen index. The oxygen index refers to the following: a material (test piece) of a certain size is placed in a test device, a mixed gas of oxygen and nitrogen is introduced under specified conditions, the test piece is ignited with an igniter, and the minimum oxygen concentration (expressed as a percentage) required to maintain continuous wax-like combustion is measured.

[0004] The oxygen index testers currently used in the market are relatively large, and general equipment can only be used in dedicated laboratories. The determination of the oxygen index performance of materials requires testing in a fixed laboratory. The convenience of the test is limited by the volume and weight of the instrument itself and the supply of oxygen and nitrogen cylinders. Utility Model Content

[0005] The utility model aims to provide a portable oxygen index tester with a simple structure, small size and light weight, which can be carried by one person, realizes the miniaturization and lightness of the instrument, and provides convenience for on-site fire supervision inspection of flame retardant materials and products.

[0006] To this end, the technical solution adopted by the present invention is: a portable oxygen index tester, including a box body and a box cover, characterized in that: a buffer pad is provided in the box body and the box cover, an air supply component embedded in the buffer pad is provided in the box body, an operation panel is provided on the operation panel, an air intake pipe connected to the air supply component is provided, a regulating valve for controlling the air intake amount is provided on the air intake pipe, an adjusting knob connected to the regulating valve is provided on the operation panel, a digital display screen for displaying the air intake amount is provided above the adjusting knob, a combustion cylinder embedded in the buffer pad of the box cover is provided on one side of the operation panel, and a three-way connection for supplying air to the combustion cylinder is provided in the box cover. Mixer, the air intake pipe is connected to the three-way mixer, the three-way mixer is connected to the combustion tube through the air supply pipe, the air supply pipe is provided with a three-way selection valve, one valve port of the three-way selection valve is connected to the combustion tube, one valve port is a spare valve port, which can be connected to the air pump, and the other valve port is connected to the combustion tube through the air supply pipe, and the operation panel is provided with a display screen for displaying the oxygen concentration and the nitrogen concentration that matches the three-way mixer; the combustion tube includes a base, a cover tube arranged on the base, the top end of the cover tube is open, and a clamp for clamping the test sample piece is provided on the base, the air supply pipe is connected to the air intake channel arranged on the base, and the air intake channel is connected to the cover tube.

[0007] As a preferred embodiment of the above scheme, the clamp includes a column arranged at the center of the base, and clamping plates are symmetrically arranged on the top of the column. A pin is provided at the bottom of one of the clamping plates. The pin passes through the axial hole at the top of the column and then passes through the pin hole at the bottom of the other clamping plate and is locked by a locking nut. The length of the pin is greater than the diameter of the axial hole column. The two clamping plates are respectively located on both sides of the column and their upper parts extend above the column.

[0008] More preferably, the combustion tube includes a base and a cover tube mounted on the base, the cover tube having an open top, and a fixture mounted on the base for holding the test sample. The cover tube is made of high-temperature resistant quartz glass, which has the advantages of high temperature resistance, low expansion coefficient, thermal shock resistance, chemical stability, good electrical insulation properties, and is transparent to ultraviolet and infrared rays.

[0009] It is further preferred that the gas supply assembly includes an oxygen cylinder and a nitrogen cylinder, the air intake pipe includes an oxygen inlet pipe and a nitrogen inlet pipe, and the oxygen cylinder and the nitrogen cylinder are both provided with a pressure relief valve at the bottle mouth, and the pressure relief valve is equipped with a high-pressure metal air pipe, and the high-pressure metal air pipe is respectively connected to the corresponding oxygen inlet pipe and nitrogen inlet pipe. The pressure relief valve is provided at the bottle mouth of the oxygen cylinder and the nitrogen cylinder, and is connected to the high-pressure metal pipe, which can be directly connected to the air intake pipe and can also be used to inflate the oxygen cylinder and the nitrogen cylinder. It is reusable and can store nitrogen and oxygen to provide the required gas source for testing.

[0010] More preferably, the gas supply pipe is connected to the combustion cylinder through a high-pressure metal gas pipe.

[0011] More preferably, the box body and the box cover are hinged at the rear side, and are respectively provided with connecting buckles at the front side. When not in use, the components in the box body can be locked by the connecting buckles, making it easy to carry.

[0012] More preferably, the outer shells of the box body and the box cover are both cast from a lightweight aluminum alloy, which reduces the overall weight of the box body and the box cover, making them easier to carry.

[0013] More preferably, the case cover is equipped with a built-in power supply, and the operation panel is provided with a charging port connected to the built-in power supply. The built-in power supply and the charging port can be used directly when performing oxygen index testing outside the laboratory, and are convenient to carry.

[0014] More preferably, the cover tube is made of high-temperature resistant quartz glass. High-temperature resistant quartz glass has the advantages of high temperature resistance, low expansion coefficient, thermal shock resistance, chemical stability and good electrical insulation performance, and can transmit ultraviolet and infrared rays.

[0015] More preferably, an oxygen sensor is provided on the air supply pipe.

[0016] The beneficial effects of the present invention are as follows: the air supply assembly, the operating panel and the combustion tube are respectively arranged in the box body and the box cover, which makes it more convenient and saves time when burning the test piece and measuring the oxygen index. The measurement can be performed without taking the test piece to a laboratory with a measuring device. When in use, the air supply assembly is directly connected to the air intake pipe on the operating panel, and the air intake volume is adjusted by the regulating valve and the regulating knob, so as to better measure the oxygen index of the test piece. The oxygen and nitrogen enter the three-way mixer for mixing, and the effect is better when the test is performed. The operating panel is provided with a display screen for displaying the oxygen concentration and the nitrogen concentration in the three-way mixer, so that the oxygen index of the test piece during combustion can be directly observed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 It is a structural schematic diagram of the combustion tube in the utility model.

[0019] Figure 3 It is a schematic diagram of the air supply path of the combustion cylinder in the utility model. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-3As shown, a portable oxygen index tester includes a box body 1 and a box cover 2, characterized in that: a cushion pad 3 is provided in both the box body 1 and the box cover 2, an air supply assembly embedded in the cushion pad 3 is provided in the box body 1, an operation panel 4 is provided on the box cover 2, an air intake pipe 5 connected to the air supply assembly is provided on the operation panel 4, a regulating valve for controlling the air intake amount is provided on the air intake pipe 5, an adjusting knob 6 connected to the regulating valve is provided on the operation panel 4, a digital display screen 7 for displaying the air intake amount is provided above the adjusting knob 6, and a combustion tube embedded in the cushion pad 3 of the box cover 2 is provided on one side of the operation panel 4 8. A three-way mixer for supplying air to the combustion tube 8 is provided in the box cover 2. The air intake pipe 5 is connected to the three-way mixer. The three-way mixer is connected to the combustion tube 8 through the air supply pipe 14. A three-way selection valve is provided on the air supply pipe 14. One valve port of the three-way selection valve is connected to the combustion tube 8, one valve port is a spare valve port, which can be connected to an air pump, and the other valve port is connected to the combustion tube 8 through the air supply pipe 14. When the carried oxygen and nitrogen are insufficient, you can also choose to connect an air pump to pump in air for testing. The operation panel 4 is provided with a display screen 9 for displaying the oxygen concentration and nitrogen concentration that matches the three-way mixer.

[0022] The combustion tube 8 includes a base 801, a cover tube 802 arranged on the base 801, the top end of the cover tube 802 is open, and a clamp 803 for clamping the test sample is provided on the base 801. The air supply pipe 14 is connected to the air intake channel 804 arranged on the base 801, and the air intake channel 804 is connected to the cover tube 802.

[0023] The clamp 803 includes a column arranged at the center of the base 801, and clamping plates are symmetrically arranged on the left and right sides of the top of the column. A pin is provided at the bottom of one of the clamping plates. The pin passes through the axial hole at the top of the column and then passes through the pin hole at the bottom of the other clamping plate and is locked by a locking nut. The length of the pin is greater than the diameter of the column with the axial hole. The two clamping plates are respectively located on both sides of the column and their upper parts extend above the column.

[0024] Combustion tube 8 comprises a base 801 and a cover 802 mounted on base 801. Cover 802 is open at its top and is equipped with a fixture 803 for holding the test sample. Cover 802 is made of high-temperature resistant quartz glass, which offers excellent heat resistance, low expansion coefficient, thermal shock resistance, chemical stability, and electrical insulation properties. It is also transparent to ultraviolet and infrared rays.

[0025] The gas supply assembly includes an oxygen cylinder 10 and a nitrogen cylinder 11. The air intake pipe 5 includes an oxygen intake pipe and a nitrogen intake pipe. The oxygen cylinder 10 and the nitrogen cylinder 11 are both provided with a pressure relief valve at the bottle mouth. The pressure relief valve is equipped with a high-pressure metal air pipe, which is respectively connected to the corresponding oxygen intake pipe and nitrogen intake pipe. The pressure relief valve is provided at the bottle mouth of the oxygen cylinder 10 and the nitrogen cylinder 11, and is connected to the high-pressure metal pipe. It can be directly connected to the air intake pipe 5 and can also be used to inflate the oxygen cylinder 10 and the nitrogen cylinder 11. It is reusable and can store nitrogen and oxygen to provide the required gas source for testing.

[0026] The gas supply pipe 14 is connected to the combustion tube 8 through a high-pressure metal gas pipe.

[0027] The box body 1 and the box cover 2 are hinged at the rear side, and the front side is respectively provided with a connecting buckle 12. When not in use, the components in the box body 1 can be locked by the connecting buckle 12 for easy carrying.

[0028] The outer shells of the box body 1 and the box cover 2 are both made of lightweight aluminum alloy. The lightweight aluminum alloy reduces the overall weight of the box body 1 and the box cover 2, making them easy to carry.

[0029] The box cover 2 is equipped with a built-in power supply, and the operation panel 4 is provided with a charging port 13 connected to the built-in power supply. The built-in power supply and the charging port 13 can be used directly when performing oxygen index testing outside the laboratory, and are convenient to carry.

[0030] The cover tube 802 is made of high-temperature resistant quartz glass. High-temperature resistant quartz glass has the advantages of high temperature resistance, low expansion coefficient, thermal shock resistance, chemical stability and good electrical insulation performance, and can transmit ultraviolet rays and infrared rays.

[0031] An oxygen sensor is provided on the air supply pipe 14 .

[0032] The air supply assembly, the operating panel 4 and the combustion tube 8 are respectively arranged in the box body 1 and the box cover 2. When burning the test piece and measuring the oxygen index, it is more convenient and saves time. The measurement can be carried out without taking it to a laboratory with a measuring device. When in use, the air supply assembly is directly connected to the air intake pipe 5 on the operating panel 4, and the air intake volume is adjusted by the regulating valve and the regulating knob 6 to better measure the oxygen index of the test piece. Oxygen and nitrogen enter the three-way mixer for mixing, which has a better effect when testing. The operating panel 4 is provided with a display screen 9 for displaying the oxygen concentration and nitrogen concentration in the three-way mixer, which can directly observe the oxygen index of the test piece during combustion.

[0033] like Figure 3As shown, the oxygen cylinder 10 and the nitrogen cylinder 11 are respectively connected to the air intake pipe 5 through high-pressure metal pipes, the decompression valve at the bottle mouth is opened, and the oxygen and nitrogen are introduced into the three-way mixer. The regulating valve on the air intake pipe 5 is a needle regulating valve, and the needle regulating valve is controlled by the regulating knob 6 to adjust the air intake amount, and the air intake amount is recorded by the flow meter and displayed on the operation panel 4 through the digital display screen 7. The oxygen and nitrogen are mixed in the three-way mixer and enter the combustion tube 8 through the three-way selection valve. The three-way selection valve is adjusted to be connected with the three-way mixer and the air supply pipe 14, and the other pipe connected to the air is closed. An oxygen sensor is provided on the air supply pipe 14, and the oxygen concentration is detected by the oxygen sensor.

[0034] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A portable oxygen index tester, comprising a box body (1) and a box cover (2), characterized in that: The box body (1) and the box cover (2) are both provided with a cushion (3), the box body (1) is provided with an air supply assembly embedded on the cushion (3), the box cover (2) is provided with an operation panel (4), the operation panel (4) is provided with an air intake pipe (5) connected to the air supply assembly, the air intake pipe (5) is provided with a regulating valve for controlling the air intake amount, the operation panel (4) is provided with an adjusting knob (6) connected to the regulating valve, a digital display screen (7) for displaying the air intake amount is provided above the adjusting knob (6), a combustion tube (8) embedded on the cushion (3) of the box cover (2) is provided on one side of the operation panel (4), the box cover (2) is provided with a three-way mixer for supplying air to the combustion tube (8), the air intake pipe (5) is connected to the three-way mixer, and the three-way mixer is connected to the air supply pipe. The combustion tube (8) is connected to the combustion tube (14), and a three-way selection valve is provided on the air supply pipe (14). One valve port of the three-way selection valve is connected to the combustion tube (8), one valve port is a spare valve port and can be connected to an air pump, and the other valve port is connected to the combustion tube (8) through the air supply pipe (14). The operation panel (4) is provided with a display screen (9) for displaying oxygen concentration and nitrogen concentration that matches the three-way mixer; the combustion tube (8) includes a base (801), a cover tube (802) provided on the base (801), the top end of the cover tube (802) is open, and a clamp (803) for clamping a test sample is provided on the base (801). The air supply pipe (14) is connected to an air inlet channel (804) provided on the base (801), and the air inlet channel (804) is connected to the cover tube (802).

2. A portable oxygen index tester according to claim 1, characterized in that: The clamp (803) includes a column arranged at the center of the base (801), and clamping plates are symmetrically arranged on the top of the column. A pin is arranged at the bottom of one of the clamping plates. The pin passes through the axial hole at the top of the column and then passes through the pin hole at the bottom of the other clamping plate and is locked by a locking nut. The length of the pin is greater than the diameter of the column with the axial hole. The two clamping plates are respectively located on both sides of the column and their upper parts extend above the column.

3. A portable oxygen index tester according to claim 2, characterized in that: The gas supply assembly comprises an oxygen cylinder (10) and a nitrogen cylinder (11), the air intake pipe (5) comprises an oxygen intake pipe and a nitrogen intake pipe, and the bottle mouths of the oxygen cylinder (10) and the nitrogen cylinder (11) are both provided with a pressure relief valve, and the pressure relief valve is equipped with a high-pressure metal air pipe, and the high-pressure metal air pipe is respectively connected to the corresponding oxygen intake pipe and nitrogen intake pipe.

4. A portable oxygen index tester according to claim 3, characterized in that: The air supply pipe (14) is connected to the combustion cylinder (8) through a high-pressure metal air pipe.

5. The portable oxygen index tester according to claim 1, characterized in that: The box body (1) and the box cover (2) are hinged at the rear side, and are respectively provided with connecting buckles (12) at the front side.

6. The portable oxygen index tester according to claim 1, characterized in that: The outer shells of the box body (1) and the box cover (2) are both cast from lightweight aluminum alloy.

7. The portable oxygen index tester according to claim 1, characterized in that: The box cover (2) is equipped with a built-in power supply, and the operation panel (4) is provided with a charging port (13) connected to the built-in power supply.

8. The portable oxygen index tester according to claim 1, characterized in that: The cover tube (802) is made of high-temperature resistant quartz glass.

9. The portable oxygen index tester according to claim 1, characterized in that: An oxygen sensor is provided on the air supply pipe (14).

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