JP2020201197A - Spontaneous ignition testing device - Google Patents

Abstract

To provide a spontaneous ignition testing device with which it is possible to easily read the flow rate of a gas which is presented by a flowmeter.SOLUTION: An introduction pipe, a flowmeter 36 and a lighting part 37 are accommodated in a housing part 31. A gas is introduced by the introduction pipe into an internal space of a body part in which a sample is accommodated. The flow rate of the gas flowing in the introduction pipe is presented by the height of a floating ball 36b in a tapered pipe 36a of the flowmeter 36. The flowmeter 36 is irradiated with light from the lighting part 37 arranged so as to face a front face 31A of the housing part 31 across the flowmeter 36. The flowmeter 36 is visible from the outside through the front face 31A of the housing part 31.SELECTED DRAWING: Figure 4

Description

The present invention relates to a spontaneous combustion test device.

A spontaneous combustion test device is a device that measures the temperature or time conditions for a sample to spontaneously ignite. For example, in the spontaneous combustion test apparatus described in Patent Document 1, the sample to be measured is housed inside the apparatus main body, and an inert gas is supplied to the inside of the apparatus main body. In this state, the temperature control of the main body of the apparatus is started so that the sample temperature is maintained at a predetermined set temperature. As a result, the sample temperature gradually rises from the initial value and stabilizes when the set temperature is reached.

After the sample temperature stabilizes, oxygen gas is supplied to the inside of the device body instead of the inert gas. In this case, the temperature of the sample rises due to the oxidation of the sample, and when the temperature of the sample reaches an unknown ignition point, the sample starts spontaneous combustion. Therefore, the time from the time when the sample temperature stabilizes to the time when the sample starts spontaneous combustion is measured.

Japanese Patent No. 3632299

The spontaneous combustion test device may be provided with a flow meter for adjusting the flow rate of the gas and checking the flow rate. The flow meter includes a tapered tube and a floating ball. Within the tapered tube, the float is located at a height corresponding to the flow rate of the supplied gas. The flow rate of the gas supplied by the positional relationship between the scale carved on the tapered tube and the height of the floating ball is presented.

However, in a flow meter for gas, the indicated flow rate may not be easily read because the scale is small and the diameter of the floating ball is small. Further, since the flow meter is not manufactured on the assumption that it is used while being installed inside the main body of the device, it becomes more difficult to read the flow rate when the flow meter is installed inside the main body of the device.

An object of the present invention is to provide a spontaneous combustion test apparatus capable of easily reading the flow rate of a gas presented by a flow meter.

An aspect according to one aspect of the present invention is a spontaneous ignition test apparatus used for evaluating conditions leading to spontaneous ignition of a sample, in which a main body having an internal space for accommodating the sample and a gas in the internal space of the main body. It has an introduction pipe for introducing the gas, a flow meter including a tapered pipe and a floating ball, and a flow meter that presents a flow rate of gas flowing through the introduction pipe according to the height of the floating ball in the tapered pipe, and the introduction surface. A housing portion that accommodates the pipe and allows the flow meter to be visually recognized through the flow rate presentation surface, and a housing portion that accommodates the flow meter and is arranged so as to face the flow rate presentation surface with the flow meter sandwiched in the housing portion. The present invention relates to a spontaneous ignition test apparatus provided with an illumination unit configured to irradiate the flow meter with light.

According to the present invention, the flow rate of the gas presented by the flow meter can be easily read.

It is a schematic sectional view of the spontaneous combustion test apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the schematic structure of the gas supply part of FIG. It is a figure which shows the structure in the housing part of FIG. It is a side view of the housing part of FIG.

(1) Configuration of Spontaneous Combustion Test Device The spontaneous combustion test device according to the embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a spontaneous combustion test apparatus according to an embodiment of the present invention. As shown in FIG. 1, the spontaneous combustion test device 100 includes a main body portion 10, a sample holder 20, a gas supply unit 30, an airbus temperature control unit 40, a rectifying member 50, a sample room temperature control unit 60, and a control unit 70. In the following description, the direction in which gravity faces is downward, and the opposite direction is upward.

The main body 10 is, for example, a housing having a rectangular parallelepiped shape, and is made of stainless steel in the present embodiment. The side wall of the main body 10 is filled with the heat insulating material 11. Inside the main body 10, an Airbus (constant temperature bath) 12 having an environment in a predetermined temperature range thermally isolated from the outside is realized. In this example, the upper limit of the above temperature range is 300 ° C. Further, as will be described later, the sample S to be measured is arranged at a substantially central portion inside the main body portion 10. Hereinafter, the space in a certain range around the sample S inside the main body 10 is referred to as a sample chamber 13.

The sample holder 20 extends in the vertical direction and holds the sample container 21 containing the sample S at the lower end. The sample container 21 is made of glass, for example, and has an opening for taking in various gases supplied by the gas supply unit 30. The sample holder 20 is fixed to the upper surface of the main body 10 in a state of being inserted into the opening 14 formed on the upper surface of the main body 10. As a result, the sample container 21 held at the lower end of the sample holder 20 is located at a substantially central portion (sample chamber 13) inside the main body 10.

The gas supply unit 30 includes a housing portion 31 arranged below the main body portion 10, and selectively supplies the reaction suppressing gas, the reaction gas, and the reaction stopping gas to the sample S stored in the sample container 21. Various pipes and valves are housed in the housing portion 31. The details of the gas supply unit 30 will be described later.

The reaction suppressing gas is an inert gas (nitrogen gas in this example) and suppresses the oxidation reaction of the sample S. The reaction gas is an oxygen concentration adjusting gas or air, and promotes the oxidation reaction of the sample S. The reaction stop gas is an inert gas (nitrogen gas in this example), and stops the oxidation reaction of the sample S. The gas supplied to the sample S is guided upward along the sample holder 20, passes through the opening 14 of the main body 10, and then is discharged from the gas discharge port 22 formed in the sample holder 20.

The Airbus temperature control unit 40 includes a heater 41, a temperature sensor 42, a fan 43, and a motor 44. The heater 41, the temperature sensor 42, and the fan 43 are arranged in the main body 10. The motor 44 is arranged below the main body 10. The rotating shaft 44a of the motor 44 is connected to the fan 43 through an opening 15 formed in the lower surface of the main body 10. The heater 41 is, for example, a heating wire, and adjusts the temperature of the Airbus 12. The temperature sensor 42 is, for example, a platinum resistance temperature detector and detects the temperature of the Airbus 12. The fan 43 agitates the atmosphere of the Airbus 12 by rotating. The motor 44 rotates and drives the fan 43.

The rectifying member 50 is a member having a bottomed cylindrical shape formed of a material having a small heat capacity such as stainless steel. The rectifying member 50 is fixed to the lower surface of the main body 10 by point contact while surrounding the sample chamber 13, and the atmosphere agitated by the Airbus temperature control unit 40 is taken in from above to the inside (see the thick arrow in FIG. 1). An opening having a diameter of, for example, 45 mm is formed above the fan 43 on the bottom wall of the rectifying member 50. Air is supplied to the central portion of the fan 43 through the opening.

The sample room temperature control unit 60 includes a heater 61 and temperature sensors 62 and 63. The heater 61 is, for example, a heating wire, and is attached in a wound state so as to surround the circumference of the sample container 21. In this example, the space surrounded by the heater 61 is partitioned as the sample chamber 13. The temperature sensors 62 and 63 are, for example, sheath thermocouples. The temperature sensor 62 is provided inside the sample container 21 and detects the temperature of the sample S housed in the sample container 21. The temperature sensor 63 is provided in the sample chamber 13 and detects the temperature of the sample chamber 13.

The control unit 70 includes a gas control unit 71, an Airbus control unit 72, a sample room control unit 73, and a measurement unit 74. The gas control unit 71 controls the gas supply unit 30 so as to selectively supply the reaction suppression gas, the reaction gas, and the reaction stop gas by switching the on-off valve 34 (see FIG. 2 described later) of the gas supply unit 30. To do.

The Airbus control unit 72 receives an input of the set temperature from the user. Further, the Airbus control unit 72 controls the heater 41 so that the temperature of the Airbus 12 detected by the temperature sensor 42 matches the above-mentioned set temperature. The sample chamber control unit 73 controls the heater 61 so that the temperature of the sample chamber 13 detected by the temperature sensor 63 matches the temperature of the sample S detected by the temperature sensor 62. The measuring unit 74 measures the time until the sample S starts spontaneous combustion. Details of the gas control unit 71 and the measurement unit 74 will be described later.

(2) Gas supply unit FIG. 2 is a block diagram showing a schematic configuration of the gas supply unit 30 of FIG. FIG. 3 is a diagram showing a configuration inside the housing portion 31 of the gas supply portion 30 of FIG. FIG. 4 is a side view of the housing portion 31 of the gas supply portion 30 of FIG. As shown in FIG. 2, the gas supply unit 30 includes a plurality of sets (three sets in this example) of an introduction unit 32, an introduction pipe 33, an on-off valve 34, a regulating valve 35, a flow meter 36, and an illumination unit 37. Further, the gas supply unit 30 further includes a merging pipe 38 and a supply pipe 39.

The plurality of sets of the introduction unit 32, the introduction pipe 33, the on-off valve 34, the adjusting valve 35, the flow meter 36, and the lighting unit 37 correspond to the reaction suppressing gas, the reaction gas, and the reaction stopping gas, respectively. In FIG. 3, only the introduction unit 32, the introduction pipe 33, the on-off valve 34, the adjustment valve 35, the flow meter 36, and the illumination unit 37 corresponding to the reaction stop gas are shown. The introduction unit 32, the introduction pipe 33, the on-off valve 34, the adjustment valve 35, the flow meter 36, and the illumination unit 37 corresponding to each of the reaction suppression gas and the reaction gas are located in the depth direction of the paper surface.

Each introduction portion 32 is attached to one side surface (hereinafter, referred to as a back surface 31B) of the housing portion 31 (see FIG. 3). Outside the housing portion 31, pipes or hoses from a gas source (not shown) that supplies gas can be connected to each introduction portion 32. By connecting each introduction unit 32 to a gas source that supplies the corresponding gas, the gas corresponding to each introduction unit 32 is introduced.

Inside the housing portion 31, a corresponding introduction pipe 33 is connected to each introduction portion 32. The gas introduced into each introduction unit 32 flows in the corresponding introduction pipe 33. In the following description, the direction in which the gas flows in each introduction pipe 33 is referred to as downstream, and the opposite direction is referred to as upstream. In addition, each introduction pipe 33 may be configured by connecting a plurality of pipes.

A corresponding on-off valve 34, a regulating valve 35, and a flow meter 36 are inserted into each introduction pipe 33 from upstream to downstream. Each on-off valve 34 is, for example, a solenoid valve, and opens and closes based on control by the gas control unit 71 of FIG. When each on-off valve 34 is in the open state, gas flows in the corresponding introduction pipe 33. When each on-off valve 34 is in the closed state, the flow of gas in the corresponding introduction pipe 33 is cut off.

Each adjusting valve 35 is, for example, a manual needle valve and has an adjusting operation unit 35a (see FIG. 3). Each adjustment operation unit 35a is provided so as to be exposed from one side surface of the housing unit 31 (in this example, the front surface 31A opposite to the back surface 31B) (see FIG. 4). The user can adjust the flow rate of the gas flowing in the introduction pipe 33 corresponding to the adjustment valve 35 by operating the adjustment operation unit 35a of the desired adjustment valve 35.

Each flow meter 36 is provided in the housing portion 31 so as to be visible from one side surface of the housing portion 31. In this example, a plurality of window portions 31a corresponding to the plurality of flow meters 36 are provided on the front surface 31A of the housing portion 31. Each flow meter 36 is provided so as to be visible from the front surface 31A of the housing portion 31 through the corresponding window portion 31a and to be vertically aligned with the corresponding adjustment operation portion 35a (see FIG. 4). The front surface 31A is an example of the flow rate presentation surface.

Each flow meter 36 includes a tapered tube 36a and a floating ball 36b. Each tapered tube 36a has a rod-shaped outer shape extending in the vertical direction, and the inner peripheral portion of each tapered tube 36a has a conical shape. The area of the upper surface of each tapered tube 36a at the inner peripheral portion is larger than the area of the lower surface. Gas can pass through each tapered pipe 36a from the lower side to the upper side.

Each float 36b is provided in the corresponding tapered tube 36a. When the gas does not pass through each tapered tube 36a, the corresponding floating ball 36b is located below the tapered tube 36a. When the gas passes through each of the tapered pipes 36a, the corresponding floating ball 36b rises by a height corresponding to the flow rate of the passing gas. The flow rate of the passing gas is presented by the positional relationship between the scale carved on each tapered tube 36a and the height of the corresponding floating ball 36b.

Each illumination unit 37 has a configuration in which a plurality of light sources (for example, light emitting diodes) are mounted on a circuit board, and is arranged on the back surface of the corresponding flow meter 36. The back surface of the flow meter 36 means a surface opposite to the surface of the flow meter 36 that presents the flow rate (the surface on which the scale of the tapered pipe 36a can be visually recognized). Each illumination unit 37 emits light when the corresponding on-off valve 34 is in the open state, based on the control by the gas control unit 71 of FIG.

In this case, since the flow meter 36 becomes bright, the notch on the scale of the tapered tube 36a and the position of the floating ball 36b can be clearly seen. As a result, the user can easily read the presented flow rate even when the scale is small and the diameter of the floating ball 36b is small. Further, since each lighting unit 37 emits light in conjunction with the open / closed state of the corresponding on-off valve 34, it is possible to easily identify the type of gas being supplied by recognizing the bright flow meter 36. it can.

In the present embodiment, the holding member 1 is provided in the housing portion 31 (see FIG. 4). The holding member 1 is formed of, for example, a sponge, and has a plurality of lightening portions 2 that overlap each of the plurality of window portions 31a. Each flow meter 36 and the corresponding illumination unit 37 are arranged in the corresponding lightening unit 2 of the holding member 1. The portion between the adjacent lightening portions 2 in the holding member 1 is used as the light shielding portion 3.

According to this configuration, even if the illumination unit 37 corresponding to any of the flow meters 36 emits light, the light is blocked by the light-shielding unit 3, so that the light does not reach the other flow meters 36. Therefore, even when a plurality of flow meters 36 are arranged close to each other, it is possible to prevent each flow meter 36 from being illuminated by an uncorresponding illumination unit 37. Therefore, the user can more reliably identify the type of gas introduced.

The downstream ends of the plurality of introduction pipes 33 are connected to the merging pipe 38, and the upstream ends of the supply pipes 39 are connected to the merging pipe 38. Further, the downstream end of the supply pipe 39 is connected to the main body 10. The supply pipe 39 supplies the gas supplied from one or more introduction pipes 33 to the main body 10 through the merging pipe 38.

(3) Operation of Spontaneous Combustion Test Device The operation of the spontaneous combustion test device 100 will be described with reference to FIG. First, the user stores the sample S to be measured in the sample container 21, and attaches the sample container 21 to the lower part of the sample holder 20. Next, the user fixes the sample holder 20 on the upper surface of the main body 10 in a state of being inserted through the opening 14 of the main body 10. As a result, the sample container 21 is arranged in the sample chamber 13.

Subsequently, the user inputs the set temperature by operating the Airbus control unit 72. When the set temperature is input, the Airbus control unit 72 controls the heater 41 so that the temperature of the Airbus 12 matches the set temperature. Further, the fan 43 agitates the atmosphere of the Airbus 12 by rotating. Further, the gas control unit 71 controls the gas supply unit 30 so as to supply the reaction suppressing gas at a flow rate adjusted by the user. In this case, the temperature of the sample S gradually rises from the initial value. The sample chamber control unit 73 controls the sample room temperature adjusting unit 60 so that the temperature of the sample chamber 13 follows the temperature of the sample S.

The temperature of sample S stabilizes when it reaches the set temperature. At this point, the measuring unit 74 starts measuring the time. Further, the gas control unit 71 controls the gas supply unit 30 so as to supply the reaction gas at a flow rate adjusted by the user instead of the reaction suppression gas. As a result, the oxidation reaction of the sample S is promoted, and the temperature of the sample S rises. The flow rate of the reaction gas is relatively small, for example, 2 mL / min to 5 mL / min. The sample chamber control unit 73 controls the sample room temperature adjusting unit 60 so that the temperature of the sample chamber 13 follows the temperature of the sample S.

When the temperature of the sample S reaches the ignition point, the temperature of the sample S rises sharply. At this point, the measuring unit 74 ends the time measurement. Further, the gas control unit 71 controls the gas supply unit 30 so as to supply the reaction stop gas instead of the reaction gas at a flow rate adjusted by the user. As a result, the oxidation reaction of sample S is stopped, and spontaneous combustion is prevented. The flow rate of the reaction stop gas is larger than the flow rate of the reaction suppression gas. The time measured by the measuring unit 74 is evaluated as a condition for the sample S to spontaneously ignite.

(4) Effect In the spontaneous combustion test apparatus 100 according to the present embodiment, a plurality of sets of introduction pipes 33, on-off valves 34, adjusting valves 35, flow meter 36, and lighting unit 37 are housed in the housing unit 31. The gas is introduced into the internal space of the main body 10 in which the sample S is housed by each introduction pipe 33. The height of the floating ball 36b in the tapered pipe 36a of each flow meter 36 indicates the flow rate of gas flowing through the corresponding introduction pipe 33.

A plurality of lighting units 37 are arranged so as to face the front surface 31A of the housing portion 31 with the plurality of flow meters 36 sandwiched between them, and the corresponding flow meters 36 are irradiated with light from each lighting unit 37. Each flow meter 36 is visible from the outside through the corresponding window portion 31a on the front surface 31A of the housing portion 31.

According to this configuration, since each flow meter 36 is brightly illuminated from the opposite side of the front surface 31A of the housing portion 31, it can be used even when the scale of the taper tube 36a is small or the diameter of the floating ball 36b is small. The person can clearly see the scale and the floating ball 36b. As a result, the flow rates of the reaction suppressing gas, the reaction gas, and the reaction stopping gas can be easily read.

Further, each lighting unit 37 emits light when the corresponding on-off valve 34 is in the open state, and stops light emitting when the corresponding on-off valve 34 is in the closed state. Therefore, the user can easily identify which gas is introduced into the internal space of the main body 10 by visually recognizing the brightly illuminated flow meter 36.

Further, the adjustment operation unit 35a of the plurality of adjustment valves 35 is provided on the front surface 31A of the housing portion 31 in which the plurality of flow meters 36 can be visually recognized. Therefore, the user can easily adjust the flow rate of the corresponding gas to a desired value by adjusting the corresponding adjustment operation unit 35a while checking the flow rate presented by each flow meter 36.

For example, in this example, the reaction gas is a high-concentration oxygen gas, but there are cases where air is desired to be used as the reaction gas. In this case, the user adjusts the adjustment operation unit 35a corresponding to the reaction suppressing gas (nitrogen gas) and the reaction gas (oxygen gas), respectively, so that the gas having the same composition as air (nitrogen gas 80% and oxygen) It is possible to produce 20% gas). In this case, since the two on-off valves 34 corresponding to the reaction suppressing gas and the reaction gas are simultaneously opened, the two lighting units 37 corresponding to these on-off valves 34 emit light at the same time. ..

(5) Other Embodiments (a) In the above-described embodiment, the measuring unit 74 measures the time until the sample S starts spontaneous combustion as a condition for the sample S to spontaneously ignite. Is not limited to this. The measuring unit 74 may measure the temperature at which the sample S spontaneously ignites as a condition for the sample S to spontaneously ignite.

(B) In the above embodiment, the gas supply unit 30 includes three sets of the introduction unit 32, the introduction pipe 33, the on-off valve 34, the adjusting valve 35, the flow meter 36, and the lighting unit 37. Not limited. The gas supply unit 30 may include a set of introduction unit 32, introduction pipe 33, on-off valve 34, adjustment valve 35, flow meter 36, and illumination unit 37. In this case, the gas supply unit 30 does not have to include the merging pipe 38, and the reaction suppressing gas and the reaction gas pass through the common introduction unit 32, the introduction pipe 33, the on-off valve 34, the adjusting valve 35, the flow meter 36 and the supply pipe 39. Alternatively, the reaction stop gas may be supplied to the internal space of the main body 10.

Alternatively, the gas supply unit 30 may include two sets of introduction units 32, an introduction pipe 33, an on-off valve 34, a regulating valve 35, a flow meter 36, and an illumination unit 37. In this case, the reaction gas is supplied through one set of the introduction unit 32, the introduction pipe 33, the on-off valve 34, the regulating valve 35 and the flow meter 36, and the reaction suppression gas or the reaction stop gas is introduced by the other set of the introduction unit 32. It may be supplied through a pipe 33, an on-off valve 34, a regulating valve 35 and a flow meter 36.

(C) In the above embodiment, the lighting unit 37 emits light in conjunction with the open / closed state of the on-off valve 34, but the embodiment is not limited to this. The illumination unit 37 may emit light at all times.

(D) In the above embodiment, the on-off valve 34 and the regulating valve 35 are separately inserted into the introduction pipe 33, but the embodiment is not limited to this. A valve in which the on-off valve 34 and the adjusting valve 35 are integrated may be inserted in the introduction pipe 33. Alternatively, one or both of the on-off valve 34 and the adjusting valve 35 may not be inserted into the introduction pipe 33.

(E) In the above embodiment, the light-shielding portion 3 is arranged between the two adjacent flow meters 36, but the embodiment is not limited to this. When the two adjacent flow meters 36 are sufficiently separated from each other and the respective flow meters 36 are prevented from being illuminated by the corresponding illumination unit 37, the two adjacent flow meters 36 are separated from each other. The light-shielding portion 3 may not be arranged. Alternatively, even when the lighting unit 37 does not emit light in conjunction with the open / closed state of the on-off valve 34 and always emits light, the light-shielding unit 3 may not be arranged between the two adjacent flow meters 36.

(F) In the above embodiment, the adjustment operation portion 35a of the adjustment valve 35 is provided on the front surface 31A of the housing portion 31, but the embodiment is not limited to this. The adjustment operation unit 35a may be provided at a portion different from the front surface 31A of the housing unit 31. Alternatively, if it is possible to remotely control the flow rate adjustment by the adjusting valve 35, the adjusting operation unit 35a may not be provided in the housing unit 31.

(6) Aspect (paragraph 1) The spontaneous combustion test apparatus according to one aspect is
A spontaneous combustion test device used to evaluate the conditions under which a sample leads to spontaneous combustion.
The main body having an internal space for accommodating the sample,
An introduction pipe that introduces gas into the internal space of the main body,
A flow meter that includes a tapered tube and a floating ball and presents the flow rate of gas flowing through the introduction tube according to the height of the floating ball in the tapered tube.
A housing portion having a flow rate presentation surface, accommodating the introduction pipe, and accommodating the flow meter so that the flow meter can be visually recognized through the flow rate presentation surface.
In the housing portion, the flow meter may be provided with an illumination unit arranged so as to face the flow rate presentation surface with the flow meter interposed therebetween so that the flow meter can be irradiated with light.

In this spontaneous combustion test device, the introduction pipe, the flow meter, and the lighting unit are housed in the housing unit. The gas is introduced into the internal space of the main body where the sample is housed by the introduction tube. The height of the floating ball in the tapered tube of the flow meter indicates the flow rate of gas flowing through the introduction tube. Light is radiated to the flow meter from an illumination unit arranged so as to face the flow rate presentation surface with the flow meter in between. The flow meter is visible from the outside through the flow rate presentation surface of the housing portion.

According to this configuration, the flow meter is brightly illuminated from the opposite side of the flow rate presentation surface, so that the user can clearly see the scale and the floating ball even if the scale of the taper tube is small or the diameter of the floating ball is small. Can be visually recognized. This makes it easy to read the flow rate of the gas presented by the flow meter.

(Section 2) In the spontaneous combustion test apparatus described in Paragraph 1,
Further, the housing portion is further provided with an on-off valve that switches between an open state in which gas flows through the introduction pipe and a closed state in which gas flow in the introduction pipe is blocked.
The lighting unit may emit light when the on-off valve is in the open state and may stop light emission when the on-off valve is in the closed state.

In this case, the user can easily identify whether or not gas is introduced into the internal space of the main body by visually recognizing whether or not the flow meter is brightly illuminated.

(Section 3) In the spontaneous combustion test apparatus described in paragraph 1,
A plurality of the introduction pipes are provided so as to be able to supply a plurality of types of gases.
A plurality of the flow meters are provided corresponding to a plurality of introduction pipes.
A plurality of the illumination units may be provided corresponding to a plurality of flow meters.

In this case, the flow rates of each of the plurality of types of gases can be easily read.

(Section 4) In the spontaneous combustion test apparatus described in Clause 3,
The housing is further provided with a plurality of on-off valves that switch between an open state in which gas flows into the corresponding introduction pipe and a closed state in which gas flows in the corresponding introduction pipe.
Each illuminating unit may emit light when the corresponding on-off valve is in the open state and may stop emitting light when the corresponding on-off valve is in the closed state.

In this case, the user can easily identify the type of gas introduced into the internal space of the main body by visually recognizing the brightly illuminated flow meter.

(Section 5) In the spontaneous combustion test apparatus described in Clause 4,
In the housing portion, a light-shielding portion that is arranged between two adjacent flow meters and blocks light from each illumination unit to the flow meter that does not correspond to the illumination unit may be further provided.

According to this configuration, even when a plurality of flow meters are arranged close to each other, it is possible to prevent each flow meter from being illuminated by an unsupported illumination unit. Therefore, the user can more reliably identify the type of gas introduced.

(Section 6) In the spontaneous combustion test apparatus according to any one of Items 3 to 5,
The plurality of introduction pipes
A first introduction tube that supplies a reaction-suppressing gas that suppresses the oxidation reaction of the sample,
A second introduction tube that supplies a reaction gas that promotes the oxidation reaction of the sample,
It may include a third introduction tube that supplies a reaction stop gas that stops the oxidation reaction of the sample.

In this case, the conditions for the sample to spontaneously ignite can be easily evaluated using the reaction suppressing gas, the reaction gas, and the reaction stopping gas. In addition, the user can easily recognize the flow rates of the reaction suppressing gas, the reaction gas, and the reaction stopping gas.

(Item 7) In the spontaneous combustion test apparatus according to any one of items 1 to 6.
A regulating valve for adjusting the flow rate of gas in the introduction pipe is further provided in the housing portion.
The adjusting valve has an adjusting operation unit operated to adjust the flow rate of gas.
The adjustment operation unit may be provided so as to be exposed to the outside of the housing portion from the flow rate presentation surface.

In this case, the adjustment operation unit is provided on the flow rate presentation surface where the flow meter can be visually recognized. Therefore, the user can easily adjust the gas flow rate to a desired value by adjusting the adjustment operation unit while checking the flow rate presented by the flow meter.

1 ... holding member, 2 ... lightening part, 3 ... shading part, 10 ... main body part, 11 ... heat insulating material, 12 ... air bath, 13 ... sample chamber, 14, 15 ... opening, 20 ... sample holder, 21 ... sample Container, 22 ... Gas outlet, 30 ... Gas supply part, 31 ... Housing part, 31A ... Front, 31B ... Back, 31a ... Window part, 32 ... Introduction part, 33 ... Introduction pipe, 34 ... On-off valve, 35 ... Adjusting valve, 35a ... Adjustment operation unit, 36 ... Flow meter, 36a ... Tapered pipe, 36b ... Floating ball, 37 ... Lighting unit, 38 ... Confluence pipe, 39 ... Supply pipe, 40 ... Air bath temperature control unit, 41, 61 ... Heater, 42, 62, 63 ... Temperature sensor, 43 ... Fan, 44 ... Motor, 44a ... Rotating shaft, 50 ... Rectifying member, 60 ... Sample room temperature control unit, 70 ... Control unit, 71 ... Gas control unit, 72 ... Air bath Control unit, 73 ... Sample room control unit, 74 ... Measurement unit, 100 ... Spontaneous ignition test device, S ... Sample

Claims (7)

A spontaneous combustion test device used to evaluate the conditions under which a sample leads to spontaneous combustion.
The main body having an internal space for accommodating the sample,
An introduction pipe that introduces gas into the internal space of the main body,
A flow meter that includes a tapered tube and a floating ball and presents the flow rate of gas flowing through the introduction tube according to the height of the floating ball in the tapered tube.
A housing portion having a flow rate presentation surface, accommodating the introduction pipe, and accommodating the flow meter so that the flow meter can be visually recognized through the flow rate presentation surface.
A spontaneous combustion test device including a lighting unit arranged in the housing portion so as to face the flow rate presentation surface with the flow meter sandwiched therein and configured to irradiate the flow meter with light. Further, the housing portion is further provided with an on-off valve that switches between an open state in which gas flows through the introduction pipe and a closed state in which gas flow in the introduction pipe is blocked.
The spontaneous combustion test apparatus according to claim 1, wherein the lighting unit emits light when the on-off valve is in the open state and stops light emission when the on-off valve is in the closed state. A plurality of the introduction pipes are provided so as to be able to supply a plurality of types of gases.
A plurality of the flow meters are provided corresponding to a plurality of introduction pipes.
The spontaneous combustion test apparatus according to claim 1, wherein a plurality of the lighting units are provided corresponding to a plurality of flow meters. The housing is further provided with a plurality of on-off valves that switch between an open state in which gas flows into the corresponding introduction pipe and a closed state in which gas flows in the corresponding introduction pipe.
The spontaneous combustion test apparatus according to claim 3, wherein each illuminating unit emits light when the corresponding on-off valve is in the open state and stops emitting light when the corresponding on-off valve is in the closed state. The spontaneous combustion test according to claim 4, further comprising a light-shielding portion arranged between two adjacent flow meters in the housing portion and blocking light from each lighting portion to a flow meter not corresponding to the lighting portion. apparatus. The plurality of introduction pipes
A first introduction tube that supplies a reaction-suppressing gas that suppresses the oxidation reaction of the sample,
A second introduction tube that supplies a reaction gas that promotes the oxidation reaction of the sample,
The spontaneous combustion test apparatus according to any one of claims 3 to 5, further comprising a third introduction tube for supplying a reaction stop gas for stopping the oxidation reaction of the sample. A regulating valve for adjusting the flow rate of gas in the introduction pipe is further provided in the housing portion.
The adjusting valve has an adjusting operation unit operated to adjust the flow rate of gas.
The spontaneous combustion test apparatus according to any one of claims 1 to 6, wherein the adjustment operation unit is provided so as to be exposed to the outside of the housing portion from the flow rate presentation surface.

Images