CN210241661U - System for calculating conversion heat load by utilizing air - Google Patents
System for calculating conversion heat load by utilizing air Download PDFInfo
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- CN210241661U CN210241661U CN201921288193.XU CN201921288193U CN210241661U CN 210241661 U CN210241661 U CN 210241661U CN 201921288193 U CN201921288193 U CN 201921288193U CN 210241661 U CN210241661 U CN 210241661U
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- 238000006243 chemical reaction Methods 0.000 title abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 48
- 239000007789 gas Substances 0.000 description 123
- 238000004364 calculation method Methods 0.000 description 14
- 238000001514 detection method Methods 0.000 description 7
- 238000010411 cooking Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
A system for calculating a converted heat load by using air comprises an air pipeline, a gas pipeline, a measuring pipeline, a first connecting pipeline, a second connecting pipeline and an output pipeline; the air pipeline, the measuring pipeline and the output pipeline are sequentially connected, the output pipeline is provided with an input pressure gauge and is connected with the stove; two ends of the first connecting pipeline are respectively connected with the gas pipeline and the measuring pipeline, and the first connecting pipeline is provided with a first gas valve; the two ends of the second connecting pipeline are respectively connected with the output end of the gas pipeline and the output end of the measuring pipeline, and the second connecting pipeline is provided with a second gas valve; the gas pipeline is provided with a gas pressure gauge and a gas pressure regulating valve; the air pipeline is provided with a pressure regulating assembly, an air pressure gauge and an air inlet valve, and the input end of the air pipeline is connected with an air compression device; the measuring pipeline is provided with a thermometer, a hygrometer, a pressure gauge in front of the flowmeter, a thermal mass flowmeter and an air outlet valve; the device also comprises a controller. The utility model discloses the mode of calculating the conversion heat load has accuracy and high efficiency concurrently.
Description
Technical Field
The utility model belongs to the technical field of gas utensil detects technique and specifically relates to an utilize air to calculate system of converting heat load.
Background
GB16410 and 2007 household gas cooking utensils stipulate that deviation of actually measured converted heat load of the cooking utensils and nominal rated heat load of a nameplate should not exceed +/-10%, otherwise, the products are unqualified. Therefore, the cooker manufacturers can set detection stations on the cooker production line to detect whether the converted heat load and other detection items of each cooker are qualified or not. The gas is required to be normally combusted in the stove conversion heat load test, corresponding data is measured by using instruments such as a gas flowmeter, a pressure sensor and the like, and finally a result is obtained through a conversion heat load calculation formula in GB16410-2007 household gas stoves.
In practical use, the following disadvantages are found: (1) in the calculation formula, the relative density of the gas actually used needs to be measured and participates in the calculation. A pressure gas distribution device is generally used in a production workshop, the gas distribution precision of the pressure gas distribution device is relatively low, the relative density of the distributed gas is unstable, the influence on a test result is large, and the repeatability is poor; (2) the volumetric gas flowmeter is used for measuring the volumetric gas flow, and the flowmeter needs to rotate the pointer for an integer circle and test for more than 1 minute to obtain an accurate numerical value. The productivity and efficiency are studied on a production line, and the gas flow is often tested for more than ten seconds, so that the gas flow reading is not accurate, the repeatability is poor, and the error of the test result is large. The testing time is long, the data is relatively accurate, but the productivity is reduced, and the enterprise benefit is influenced; (3) the volumetric gas flowmeter is expensive, and increases the enterprise cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides an utilize air to calculate system of converting heat load has accuracy and high efficiency concurrently.
The embodiment of the utility model provides a system for utilize air calculation to convert heat load, including air pipeline, gas pipeline, measuring tube, first connecting line, second connecting line and output pipeline; the air pipeline, the measuring pipeline and the output pipeline are sequentially connected, the output pipeline is provided with an input pressure gauge and is used for connecting a stove; the two ends of the first connecting pipeline are respectively connected with the output end of the gas pipeline and the input end of the measuring pipeline, and the first connecting pipeline is provided with a first gas valve; the two ends of the second connecting pipeline are respectively connected with the output end of the gas pipeline and the output end of the measuring pipeline, and the second connecting pipeline is provided with a second gas valve; the gas pipeline is provided with a gas pressure gauge and a gas pressure regulating valve; the air pipeline is provided with a pressure regulating assembly, an air pressure gauge and an air inlet valve, and the input end of the air pipeline is connected with an air compression device; the measuring pipeline is provided with a thermometer, a hygrometer, a pressure gauge in front of the flowmeter, a thermal mass flowmeter and an air outlet valve; the system for calculating and converting the heat load by utilizing the air further comprises a controller, wherein the air pressure gauge, the gas pressure gauge, the input pressure gauge, the thermometer, the hygrometer, the pressure gauge in front of the flowmeter, the thermal mass flow meter, the pressure regulating assembly, the air inlet valve, the gas pressure regulating valve, the first gas valve, the second gas valve and the gas outlet valve are all connected with the controller.
Preferably, the pressure regulating assembly comprises a pressure reducing valve and an air pressure regulating valve.
Preferably, an air filter is further connected to the air pipeline.
Preferably, the gas pipeline is also provided with a gas input valve and a gas filter.
Preferably, the gas pipeline is further connected with a fire testing pipeline, and the output end of the fire testing pipeline is connected with a fire testing gun.
Preferably, the second gas valve is arranged at one end of the second connecting pipe close to the measuring pipeline, and the gas outlet valve is arranged at the output end of the measuring pipeline.
The utility model discloses in, use compressed air to carry out the calculation of the heat load of converting, through compressor arrangement and pressure regulating subassembly's cooperation, make the pressure of input air remain stable. The thermal mass flowmeter is used for replacing a volumetric gas flowmeter, so that the testing precision is high, the instantaneous flow is stable, the response speed is high, and the cost is lower. Therefore, the utility model discloses utilize the air to calculate the mode of converting heat load, have accuracy, high efficiency and economic nature concurrently.
Drawings
FIG. 1 is a schematic diagram of a system for calculating a reduced thermal load using air according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a system for calculating a reduced thermal load using air according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
An embodiment of the utility model provides a system for utilize air calculation to convert heat load, as shown in fig. 1, it includes air pipeline 1, gas pipeline 2, measuring pipe 3, first connecting line 41, second connecting line 42 and output pipeline 5. The pipeline refers to a channel for gas to flow through, and can be formed by connecting pipes. The air pipeline 1, the measuring pipeline 3 and the output pipeline 5 are connected in sequence, an input pressure gauge 51 is arranged in the output pipeline 5, and the input pressure gauge 51 is used for detecting the gas pressure before being input into the kitchen range. Meanwhile, the output line 5 is used to connect with the cooktop 100 to supply gas to the cooktop 100. Typically, the output end of the output pipeline 5 is connected to the cooking range 100 through a pagoda, where the cooking range 100 may be a gas range, an integrated range, or the like.
Two ends of the first connecting pipeline 41 are respectively connected with the output end of the gas pipeline 2 and the input end of the measuring pipeline 3, and under the condition of no blockage, the gas pipeline 2, the first connecting pipeline 41, the measuring pipeline 3 and the output pipeline 5 are communicated passages. For this purpose, a first gas valve 43 is provided on the first connection line 41 to control the opening and closing of the first connection line 41. The two ends of the second connecting pipeline 42 are respectively connected with the output end of the gas pipeline 2 and the output end of the measuring pipeline 3, and the gas pipeline 2, the second connecting pipeline 42 and the output pipeline 5 are communicated passages under the condition of no obstruction. For this purpose, a second gas valve 44 is provided in the second connecting line 42 to control the opening and closing of the second connecting line 42.
The gas pipeline 2 is provided with a gas pressure gauge 24 and a gas pressure regulating valve 25, the gas pressure gauge 24 is used for detecting the pressure in the gas pipeline 2, and the gas pressure regulating valve 25 can regulate the pressure output by the gas pipeline 2. The gas supply device 21 supplies gas of a predetermined pressure to the gas pipe 2. The air pipeline 1 is provided with a pressure regulating assembly, an air pressure gauge 14 and an air inlet valve 16, the pressure regulating assembly is used for regulating the pressure in the air pipeline 1, the air pressure gauge 14 is used for detecting the pressure in the air pipeline 1, and the air inlet valve 16 is used as a switch valve for controlling whether the air pipeline 1 is conducted or not. The input end of the air pipeline 1 is connected with an air compression device 11, and the air compression device 11 compresses air and then inputs the air into the air pipeline 1.
The measuring pipeline 3 is provided with a thermometer 31, a hygrometer 32, a thermal mass flowmeter 35, a pre-flowmeter pressure gauge 33 and an air outlet valve 34, the thermometer 31 detects the temperature of the gas in the measuring pipeline 3, the hygrometer 32 is used for measuring the humidity of the gas in the measuring pipeline 3, the thermal mass flowmeter 35 is used for detecting the flow rate of the gas in the measuring pipeline 3, the pre-flowmeter pressure gauge 33 is used for detecting the pressure of the gas in the measuring pipeline 3, and the air outlet valve 34 controls the conduction of the measuring pipeline 3.
The system also comprises a controller which plays the roles of data collection, calculation processing and instruction sending. The air pressure gauge 14, the gas pressure gauge 24, the input pressure gauge 51, the thermometer 31, the hygrometer 32, the thermal mass flowmeter 35, the pressure gauge 33 before the flowmeter, the pressure regulating assembly, the air inlet valve 16, the gas pressure regulating valve 25, the first gas valve 43, the second gas valve 44 and the air outlet valve 34 are all connected with a controller, data detected by the air pressure gauge 14, the gas pressure gauge 24, the input pressure gauge 51, the thermometer 31, the hygrometer 32 and the thermal mass flowmeter 35 are sent to the controller, and the controller obtains corresponding parameter values. The pressure regulating assembly, the air inlet valve 16, the gas pressure regulating valve 25, the first gas valve 43, the second gas valve 44 and the gas outlet valve 34 are operated by the control command of the controller, so as to realize the pressure regulation or the opening and closing of the valves.
Fig. 2 is a schematic structural diagram of a circuit control portion of the entire system according to an embodiment. The PLC71 is a core control part, the button 73, the electromagnetic valve 74 and the upper computer 72 are respectively connected with the PLC71, the detection instrument 75, the acquisition module 76 and the PLC71 are sequentially connected, the circuit control part has a man-machine interaction function, and partial preset parameters can be input into the PLC71 through the button 73. The data detected by the detecting instrument 75 are collected into the collecting module 76 and sent to the PLC71 through the collecting module 76, and the PLC71 is communicated with an upper computer and controls the electromagnetic valve 74 to be opened or closed according to an internally set program.
The instrumentation 75 may include the air pressure gauge 14, the gas pressure gauge 24, the input pressure gauge 51, the thermometer 31, the hygrometer 32, the pre-flow-meter pressure gauge 33, and the thermal mass flow meter 35 of the above embodiments, and the solenoid valve 74 may include the above-described pressure regulating assembly, the air inlet valve 16, the gas pressure regulating valve 25, the first gas valve 43, the second gas valve 44, and the outlet valve 34.
In one embodiment, the pressure regulating assembly includes a pressure reducing valve 13 and an air pressure regulating valve 15, the air compressing device 11 inputs compressed air having a predetermined pressure, the pressure reducing valve 13 reduces the pressure of the input compressed air, and the air pressure regulating valve 15 regulates it to a normal test pressure.
Further, an air filter 12 is connected to the air line 1, and the air filter 12 is connected to an input end of the air line 1 to filter the input compressed air.
In one embodiment, the gas line 2 is further provided with a gas inlet valve 22 and a gas filter 23. The gas input valve 22 is used for controlling the input end of the gas pipeline 2 to be connected or disconnected, and the gas filter 23 is used for filtering the input gas.
In one embodiment, the gas pipeline 2 is further connected with a fire testing pipeline 6, the output end of the fire testing pipeline 6 is connected with a fire testing gun, a fire testing control valve 61 is further arranged on the middle pipeline of the fire testing pipeline 6, the fire testing control valve 61 is used for controlling the conduction or interruption of the fire testing pipeline 6, and the fire testing gun is used for testing whether the gas leakage condition exists in the cooker.
In one embodiment, the second gas valve 44 is disposed at an end of the second connection pipe 42 close to the measuring pipe 3 and shortens the pipe between the second gas valve 44 and the measuring pipe 3 as much as possible, and the gas outlet valve 34 is disposed at an output end of the measuring pipe 3 and is as close to the output pipe 5 as possible. In this way, in the ignition test mode, the gas is directly supplied from the second connecting pipe 42 without passing through the measuring pipeline 3, so that the residual air behind the air outlet valve 34 and the second gas valve 44 can be reduced, the length of the gas flowing path is shortened, the ignition time of the cooker is shortened, and the efficiency is improved.
For the above system for calculating the reduced heat load by using air, the calculation method of the system will be described in detail herein, and the method specifically includes the following steps:
the air compressor unit 11 may be connected to a controller, and after the whole test process is started, the controller sends a control command to the air compressor unit 11 to control the air compressor unit 11 to start working, and the air line 1 starts to input compressed air. It is of course also possible to connect the air line 1 to the air compressor device 11 manually during testing. The air pressure gauge 14 feeds back the pressure value in the air pipeline 1 in real time, and the controller adjusts the pressure regulating assembly to enable the air input pressure to reach the preset test pressure. The controller opens the air inlet valve 16 and the air outlet valve 34 again, and the air in the air pipe 1 flows through the test pipe 3 and the output pipe 5, and is finally output to the cooker 100. The state of the cooking appliance 100 needs to be set in advance, and when the test is converted into the heat load, a gas regulating switch of the cooking appliance 100 should be kept at the maximum fire position. A 2.5 kg weight can be used to press on the cooktop knob to keep it in the maximum fire position and to keep it open.
This test state needs to be maintained for a certain time in order for the relevant data to be detectable by each instrument. The air pressure gauge 14, the thermometer 31, the hygrometer 32, the pre-flow meter pressure gauge 33, the thermal mass flow meter 35 and the input pressure gauge 51 respectively acquire relevant detection data and are summarized to the controller. The controller calculates a first reduced heat load of the stove according to a reduced heat load calculation formula. The following calculation formula is the existing calculation formula for converting the heat load:
in the formula:
phi-actual measured reduced thermal load in kilowatts (kW);
Q1the low heat value of the design gas at 0 ℃ and 101.3kPa is megajoules per cubic meter (MJ/m)3)；
v-measured gas flow in units of cubic hourly (m)3/h)；
da-the relative density of the dry test gas under standard conditions;
dmg-the relative density of the dry design gas at standard conditions;
pamb-atmospheric pressure at the time of the test in kilopascals (kPa);
psthe rated gas supply pressure used in the design is kilopascal (kPa);
pm-measuring the relative static pressure of the gas in the gas meter in kilopascals (kPa);
pgmeasuring the relative static pressure of the fuel gas in front of the stove in kilopascal (kPa);
tgactually measuring the gas temperature in the gas flowmeter, wherein the unit is centigrade (DEG C);
s-temperature tgSaturated water vapor pressure in kilopascals (kPa) (when measured using a dry flow meter, the value of s should be corrected by multiplying by the relative humidity of the test gas);
0.622-relative density of water vapor ideal gas.
In the above formula, the low heating value Q1 and the dry design gas dmg are set values, and are recorded in the controller in advance. The gas flow is detected by a thermal mass flow meter 35. The relative density da of the dry test gas may be recorded by an inspector at the time of inspection on site or may be stored in the system in advance, and generally, the relative density of air is fixed to 1. The atmospheric pressure during the test is collected by an atmospheric pressure transmitter and uploaded to the system. The gas relative static pressure in the gas flow meter is the data detected by the pressure gauge 33 before the flow meter. The relative static pressure of the gas in front of the cooker is the data detected by the input pressure gauge 51. The gas temperature is detected by the thermometer 31, the saturated steam pressure s is obtained according to the temperature of the thermometer 31, specifically, the system stores a corresponding table of the temperature value and the saturated steam pressure, after the temperature value is obtained, the system can search the saturated steam pressure corresponding to the temperature value, that is, the saturated steam pressure can be obtained, of course, the temperature value can also be manually read and the table can be searched, and then the temperature value is manually entered into the system. The gas humidity is detected by a hygrometer 32.
Based on the above equation and the detected parameters, a first reduced thermal load may be calculated. For the furnace with a plurality of furnace heads, the operation can be repeated until the data of each furnace head are tested, and a test result is obtained.
In one embodiment, the method further comprises the steps of: the testing mode can be manually changed, the system enters the ignition testing mode by operating the related buttons, and in the ignition testing mode, the controller closes the gas outlet valve 34 and opens the second gas valve 44, so that the gas flows through the second connecting pipeline 42, and the normal combustion testing of the ignition of the cooker is carried out. Specifically, operations such as ignition performance, flameout protection devices and flame states of the kitchen range, open flame leakage detection by a fire testing gun and the like are carried out through manual testing so as to detect whether the kitchen range meets the requirements or not. The gas does not pass through the measuring pipeline 3, but is directly supplied from the second connecting pipe 42, the second gas valve 44 is arranged at one end of the second connecting pipe 42 close to the measuring pipeline 3, and the pipeline between the second gas valve 44 and the measuring pipeline 3 is shortened as much as possible, and the gas outlet valve 34 is arranged at the output end of the measuring pipeline 3 and close to the output pipeline 5 as much as possible, so that the residual air behind the gas outlet valve 34 and the second gas valve 44 can be reduced, the length of a gas flowing path is shortened, the ignition time of the cooker is shortened, and the efficiency is improved. After the manual detection is finished, the stop button is pressed, the control system cuts off all the valves, and the test is finished.
In one embodiment, the methane test may be used to convert the heat load to a comparative verification of the data accuracy of the air test converted heat load. The method also includes the steps of: the controller closes the air inlet valve 16 and adjusts the gas pressure regulating valve 25 to bring the gas input pressure to the predetermined test pressure. When the first gas valve 43 is opened, gas will flow through the test line 3 and the output line 5 and finally output to the hob 100. In order that each instrument can detect relevant data, the test state needs to be maintained for a certain time, and the pressure gauge 33, the thermometer 31, the hygrometer 32, the pressure gauge 33, the thermal mass flow meter 35 and the input pressure gauge 51 respectively acquire relevant detection data and summarize the data to the controller. The controller calculates a second reduced heat load of the cooker according to the above reduced heat load calculation formula. Wherein the relative density da of the dry test gas is the relative density of the tested fuel gas, which can be entered into the system by the inspector on site at the time of inspection. And after the second reduced heat load is obtained through calculation, comparing the first reduced heat load with the second reduced heat load, and judging whether the first reduced heat load is accurate or not. If the first reduced thermal load is not within the predetermined range of values for the second reduced thermal load, the calculation of the reduced thermal load is inaccurate and needs to be re-detected.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement.
Claims (6)
1. A system for calculating a reduced thermal load using air, comprising:
the device comprises an air pipeline, a gas pipeline, a measuring pipeline, a first connecting pipeline, a second connecting pipeline and an output pipeline; the air pipeline, the measuring pipeline and the output pipeline are sequentially connected, the output pipeline is provided with an input pressure gauge and is used for connecting a stove; the two ends of the first connecting pipeline are respectively connected with the output end of the gas pipeline and the input end of the measuring pipeline, and the first connecting pipeline is provided with a first gas valve; the two ends of the second connecting pipeline are respectively connected with the output end of the gas pipeline and the output end of the measuring pipeline, and the second connecting pipeline is provided with a second gas valve; the gas pipeline is provided with a gas pressure gauge and a gas pressure regulating valve; the air pipeline is provided with a pressure regulating assembly, an air pressure gauge and an air inlet valve, and the input end of the air pipeline is connected with an air compression device; the measuring pipeline is provided with a thermometer, a hygrometer, a pressure gauge in front of the flowmeter, a thermal mass flowmeter and an air outlet valve; the system for calculating and converting the heat load by utilizing the air further comprises a controller, wherein the air pressure gauge, the gas pressure gauge, the input pressure gauge, the thermometer, the hygrometer, the pressure gauge in front of the flowmeter, the thermal mass flow meter, the pressure regulating assembly, the air inlet valve, the gas pressure regulating valve, the first gas valve, the second gas valve and the gas outlet valve are all connected with the controller.
2. The system of claim 1, wherein:
the pressure regulating assembly comprises a pressure reducing valve and an air pressure regulating valve.
3. The system of claim 2, wherein:
and the air pipeline is also connected with an air filter.
4. The system of claim 1, wherein:
the gas pipeline is also provided with a gas input valve and a gas filter.
5. The system of claim 1, wherein:
the gas pipeline is also connected with a fire testing pipeline, and the output end of the fire testing pipeline is connected with a fire testing gun.
6. The system of claim 1, wherein:
the second gas valve is arranged at one end, close to the measuring pipeline, of the second connecting pipe, and the gas outlet valve is arranged at the output end of the measuring pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921288193.XU CN210241661U (en) | 2019-08-09 | 2019-08-09 | System for calculating conversion heat load by utilizing air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921288193.XU CN210241661U (en) | 2019-08-09 | 2019-08-09 | System for calculating conversion heat load by utilizing air |
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| Publication Number | Publication Date |
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| CN210241661U true CN210241661U (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921288193.XU Withdrawn - After Issue CN210241661U (en) | 2019-08-09 | 2019-08-09 | System for calculating conversion heat load by utilizing air |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319463A (en) * | 2019-08-09 | 2019-10-11 | 中山市铧禧电子科技有限公司 | A kind of system and method calculating reduced heat input using air |
-
2019
- 2019-08-09 CN CN201921288193.XU patent/CN210241661U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319463A (en) * | 2019-08-09 | 2019-10-11 | 中山市铧禧电子科技有限公司 | A kind of system and method calculating reduced heat input using air |
| CN110319463B (en) * | 2019-08-09 | 2024-03-19 | 中山市铧禧电子科技有限公司 | System and method for calculating heat load by using air |
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