CN205404466U - Experimental thermal release speed measuring device of portable conflagration - Google Patents

Abstract

The utility model discloses an experimental thermal release speed measuring device of portable conflagration, including food tray, insulating layer, weighing module, weight changer, data processing device and display, the food tray is placed on several weighing module, is equipped with the insulating layer between food tray and the weighing module, weight changer and weighing module link to each other, turn into data signal with weighing module's weight signal, data processing device links to each other with the weight changer, passes through the formula computing with received data signal and goes out thermal release speed and shown by the display.

Description

A kind of portable fire test HRR measurement apparatus

Technical field

This utility model relates to a kind of portable fire test HRR measurement apparatus, is mainly used in the on-the-spot fire test that fire scale is bigger.

Background technology:

Fire can cause huge destruction to human society with naturally, HRR is the important parameter describing fire process, it embody in fire exergonic how much, it it is the basic parameter determining fire development and fire hazard, its unit is generally kw, the energy of release in the representation unit time, needs to measure HRR and changes over, thus fire size is carried out quantitative analysis in Fire Science test.

Carry out the experiment measuring of combustible HRR in large scale fire significant, because the experiment of large scale can simulate real fire hazard environment, test result is reliable, the experiment of large scale is possible not only to evaluate combustible more real Behavior law in a fire, also can synchronize to investigate the change of the surrounding fire dynamics parameter that combustible causes.

At present, in examination fire test, the approach of combustible HRR mainly has three kinds:

1) empirical formula method: for the burning things which may cause a fire disaster such as liquid pool fire, Wood crib Fire, its HRR is estimated by more existing classical formulas, but its shortcoming is to estimate peak heat rate of release, can not reflecting the time dependent characteristic of burning things which may cause a fire disaster rate of heat release, therefore it predicts the outcome and error between real data is bigger；

2) oxygen consumption principle method: know according to a large amount of fire test data, consumes energy produced by unit mass oxygen in major part fuel combustion process and is about 13.1MJ/kg, therefore can calculate heat release rate according to oxygen concentration change in combustion product.But such method typically requires large-scale exhaust fume collecting hood, accurately collect combustion product gases, and need supporting high-precision gas component analysis equipment, and on-the-spot test can not reach this requirement substantially；

3) weight-loss method: quality of fuel loss is measured in real time, obtains mass loss rate, then the combustion heat value being multiplied by fuel is calculated, namely

$Q={\mathrm{\χH}}_c\stackrel{\·}{m}---\left(1\right)$

In formula, Q is HRR, and χ is fuel economy, Δ H_cFor fuel combustion calorific value,Burning things which may cause a fire disaster mass loss rate.Then need to use weighing system system to measure in real time, obtain quality of fuel loss speed.Application weight-loss method relies primarily on purchase commercial electronic balance to the measurement of fuel mass lost data at present, but the electronic balance general size of routine is fixed, cannot being adjusted according to the area change of fuel in test, weighing operation process is complicated, and volume heaviness is inconvenient to carry.It addition, use conventional electronic balance can not the time dependent rule of quick obtaining HRR at the scene, particularly inconvenient for large scale scene fire test.

Summary of the invention

The purpose of this utility model is in that to provide fire test HRR measurement apparatus that is a kind of easy to carry and that can quickly provide HRR to change over rule.

The portable fire test HRR measurement apparatus that this utility model provides includes the food tray for containing fuel and thermal insulation layer, Weighing module, weight transmitter, data processing equipment and display, described food tray is placed on several Weighing module, thermal insulation layer it is provided with between food tray and Weighing module, described weight transmitter is connected with Weighing module, the weight signal of Weighing module is converted into digital signal, described data processing equipment is connected with weight transmitter, and the digital signal received is passed through formulaCalculating HRR and shown by display, in formula: Q is HRR, χ is fuel economy, Δ H_cFor fuel combustion calorific value,Speed is lost for fuel mass.

Further, support bracket it is provided with between thermal insulation layer and Weighing module.

Further, food tray is combined by multiple food trays.

Further, Weighing module is four.

Further, data processing equipment and weight transmitter are by bluetooth wireless connections.

This utility model device can calculate, show and store heat release rate data in real time, it is thus possible to the time dependent rule of quick obtaining HRR at the scene, in addition, this utility model apparatus structure is simple, simple operation, precision is higher and is easy to carry, can be suitably used for different size of burning things which may cause a fire disaster, be particularly suited for large area scene fire test.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model embodiment 1.

Fig. 2 is the exploded view of structure shown in Fig. 1.

Fig. 3 is the structural representation of this utility model embodiment 2.

Fig. 4 is the exploded view of structure shown in Fig. 3.

Each part in Fig. 1, Fig. 3 all draws by Transparent Parts, in order to represent structure.

In figure: 1 data processing equipment 2 food tray 3 thermal insulation layer 4 Weighing module 5 weight transmitter 6 display 7 Bluetooth signal transmitter 8 support bracket

Detailed description of the invention

Embodiment 1

As shown in Figure 1 and Figure 2; this utility model includes data processing equipment 1, food tray 2, thermal insulation layer 3, Weighing module 4, weight transmitter 5 and display 6; food tray 2 is placed on four Weighing modules 4; for containing fuel; in order to realize the thermal insulation protection to Weighing module 4; being provided with thermal insulation layer 3 between food tray 2 and Weighing module 4, thermal insulation layer 3 can adopt fire-resistant gypsum panel, ca silicate fibre plate etc..Weight transmitter 5 is connected with four Weighing modules 4 and data processing equipment 1 by wire, passes to data processing equipment 1 after the weight signal received is converted into digital signal, and formula pressed by data processing equipment 1Calculating HRR and shown by display 6, in formula: Q is HRR, χ is fuel economy, Δ H_cFor fuel combustion calorific value,Speed is lost for fuel mass.

Described data processing equipment 1 can adopt the programmable controller PLC of external connection keyboard, can set the combustion heat value Δ H of pluralities of fuel before test according to fuel performance_cWith efficiency of combustion χ, and be preset in PLC by keyboard, when PLC calculates, first calculate fuel mass loss speed according to the adjacent twice fuel mass digital signal receivedThen further according to formulaAutomatically calculating HRR Q, every 2 seconds of digital signal gathers once, and the HRR Q every time calculated is shown on the display being connected with PLC, it is thus possible to the time dependent rule of quick obtaining HRR at the scene.The HRR Q every time calculated also can be stored in mobile storage medium (such as USB flash disk) in real time.

Weighing module 4 and weight transmitter 5 in this utility model can directly be bought from market.

Embodiment 2

As shown in Figure 3, Figure 4, this utility model includes data processing equipment 1, food tray 2, thermal insulation layer 3, Weighing module 4, weight transmitter 5, display 6, Bluetooth signal transmitter 7 and support bracket 8, support bracket 8 is placed on four Weighing modules 4, thermal insulation layer 3 covers on support bracket 8, and thermal insulation layer 3 can adopt the thermal insulation inorganic materials such as asbestos, rock wool, glass cotton.Food tray 2 is placed on thermal insulation layer 3, is used for containing fuel, and in the present embodiment, food tray 2 is combined by two food trays, is mainly used in large area combustion site.Weight transmitter 5 is connected by wire and four Weighing modules 4, and the weight signal received is converted into digital signal.The data processing equipment 1 of the present embodiment adopts the single-chip microcomputer being connected with keyboard, single-chip microcomputer is built-in with bluetooth and accepts module, weight transmitter 5 is connected to Bluetooth signal transmitter 7, and data processing equipment 1 accepts module and Bluetooth signal transmitter 7 and weight transmitter 5 wireless connections by built-in bluetooth.

In the same manner as in Example 1, the combustion heat value Δ H of pluralities of fuel can be set before test according to fuel performance_cWith efficiency of combustion χ, and be preset in single-chip microcomputer by keyboard, when single-chip microcomputer calculates, first calculate fuel mass loss speed according to the adjacent twice fuel mass digital signal receivedThen further according to formulaAutomatically calculating HRR Q, every 2 seconds of digital signal gathers once, and the HRR Q every time calculated is shown on the display 6 being connected with PLC, it is thus possible to the time dependent rule of quick obtaining HRR at the scene.The HRR Q every time calculated also can be stored in mobile storage medium (such as USB flash disk) in real time.

The above is only the good embodiment of this utility model, but protection domain of the present utility model is not limited thereto, and any all should be encompassed in protection domain of the present utility model based on scheme of the present utility model and the improvement that carries out of design and replacing.

Claims (5)

1. a portable fire test HRR measurement apparatus, including food tray, for containing fuel, it is characterized in that: also include thermal insulation layer, Weighing module, weight transmitter, data processing equipment and display, described food tray is placed on several Weighing module, thermal insulation layer it is provided with between food tray and Weighing module, described weight transmitter is connected with Weighing module, the weight signal of Weighing module is converted into digital signal, described data processing equipment is connected with weight transmitter, the digital signal received is calculated HRR by formula and is shown by display.

2. portable fire according to claim 1 test HRR measurement apparatus, it is characterised in that: it is provided with support bracket between described thermal insulation layer and Weighing module.

3. portable fire according to claim 2 test HRR measurement apparatus, it is characterised in that: described food tray is combined by multiple food trays.

4. portable fire according to claim 1 and 2 test HRR measurement apparatus, it is characterised in that: Weighing module is four.

5. portable fire according to claim 1 and 2 test HRR measurement apparatus, it is characterised in that: described data processing equipment and weight transmitter are by bluetooth wireless connections.