A temperature box rapid temperature rise and fall electric energy explosion-proof heating system and method

Abstract

The present invention relates to the technical field of laboratory equipment, and in particular to a temperature box rapid heating and cooling electric energy explosion-proof heating system and method, comprising a test box body, a high-temperature oil tank, a high-temperature oil pump, a heat exchanger, a blower and a damper. The test box body provides installation conditions for the heat exchanger, the blower and the damper. When the test box body needs to be heated up, the high-temperature oil tank works to preheat the intermediate medium silicone oil in the high-temperature oil tank, and the high-temperature oil pump is started at the same time. The high-temperature oil pump transports the preheated silicone oil to the heat exchanger to heat the heat exchanger until the temperature reaches a preset value to achieve heating of the test box body. When cooling is required, the high-temperature oil tank and the heat exchanger stop working, and the damper is opened at the same time, and the blower works to cool the test box body, thereby solving the problem that the existing high-temperature and low-temperature test boxes cannot meet the requirements of explosion-proof and efficient high and low temperature adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of laboratory equipment, and in particular to an electric explosion-proof heating system and method for a temperature box to quickly increase or decrease the temperature. Background Art

[0002] High and low temperature test chamber is suitable for high and low temperature reliability test of industrial products. For the parts and materials of electronic and electrical, automobile and motorcycle, aerospace, ship weapons, colleges and universities, scientific research institutions and other products with special explosion-proof requirements, they need to meet the requirements of rapid temperature rise and fall and explosion-proof under the condition of high and low temperature (alternating) cycle changes.

[0003] Due to explosion-proof requirements, the surface power of the heater cannot be maximized. At the same time, rapid temperature rise is required, which requires a lot of power. Summary of the invention

[0004] The purpose of the present invention is to provide a temperature box rapid heating and cooling electric explosion-proof heating system and method, aiming to solve the problem that the existing high-temperature and low-temperature test box cannot meet the requirements of explosion-proof and high-temperature efficient regulation.

[0005] To achieve the above-mentioned objectives, in the first aspect, the present invention provides a temperature box rapid heating and cooling electric explosion-proof heating system, comprising a test box body, a high-temperature oil tank, a high-temperature oil pump, a heat exchanger, a blower and a damper, wherein the high-temperature oil tank is arranged on one side of the test box body, the high-temperature oil pump is connected to the high-temperature oil tank, the heat exchanger is fixedly connected to the test box body and connected to the high-temperature oil pump, the blower is fixedly connected to the test box body and is located on one side of the test box body, and the damper is arranged on one side of the test box body.

[0006] Among them, the high-temperature oil tank includes an oil tank body, multiple explosion-proof heating pipes and an over-temperature sensor. The oil tank body is arranged on one side of the test box body. The multiple explosion-proof heating pipes are respectively fixedly connected to the oil tank body and are all located in the oil tank body. The over-temperature sensor is fixedly connected to the oil tank body and is located on one side of the oil tank body.

[0007] Wherein, the high-temperature oil pump includes an oil pump body and an oil pressure switch, the oil pump body is fixedly connected to the oil tank body and is located in communication with the oil tank body, and the oil pressure switch is in communication with the oil pump body and the heat exchanger.

[0008] Among them, the damper includes a pneumatic push rod, a connecting rod, a baffle and a solenoid valve, the pneumatic push rod is fixedly connected to the test box body and is located on one side of the test box body, the connecting rod is fixedly connected to the output end of the pneumatic push rod, the baffle is fixedly connected to the connecting rod and is located on one side of the connecting rod, and the solenoid valve is fixedly connected to the pneumatic push rod and is located on one side of the pneumatic push rod.

[0009] In a second aspect, a method for rapidly heating and cooling an incubator with electric energy explosion-proof heating is applied to the incubator rapidly heating and cooling an incubator with electric energy explosion-proof heating system according to the first aspect, comprising the following steps:

[0010] The high temperature oil tank works to preheat the intermediate medium silicone oil in the high temperature oil tank;

[0011] Starting the high-temperature oil pump to deliver the preheated silicone oil to the heat exchanger, heating the heat exchanger until the temperature reaches a preset value to heat the test box body;

[0012] The high temperature oil tank and the heat exchanger stop working, and the damper and the blower are opened to cool down the test box body.

[0013] The present invention provides a temperature box rapid heating and cooling electric explosion-proof heating system, the test box body provides installation conditions for the heat exchanger, the blower and the damper. When the test box body needs to be heated, the high-temperature oil tank works to preheat the intermediate medium silicone oil in the high-temperature oil tank, and the high-temperature oil pump is started at the same time. The high-temperature oil pump transports the preheated silicone oil to the heat exchanger to heat the heat exchanger until the temperature reaches a preset value to achieve heating of the test box body. When cooling is required, the high-temperature oil tank and the heat exchanger stop working, and the damper is opened at the same time, and the blower works to cool the test box body, thereby solving the problem that the existing high-temperature and low-temperature test boxes cannot meet the requirements of explosion-proof and efficient high and low temperature adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of a temperature box rapid temperature rise and fall electric energy explosion-proof heating system provided by the present invention.

[0016] Figure 2The present invention provides a flow chart of a method for rapidly raising and lowering the temperature of a temperature box using electric energy explosion-proof heating.

[0017] 1-test chamber body, 2-high temperature oil tank, 3-high temperature oil pump, 4-heat exchanger, 5-blower, 6-damper, 11-oil tank body, 12-explosion-proof heating pipe, 13-over-temperature sensor, 21-oil pump body, 22-oil pressure switch, 61-pneumatic push rod, 62-connecting rod, 63-baffle, 64-solenoid valve. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] See also Figure 1 to Figure 2 In the first aspect, the present invention provides a temperature box rapid heating and cooling electric explosion-proof heating system, comprising a test box body 1, a high-temperature oil tank 2, a high-temperature oil pump 3, a heat exchanger 4, a blower 5 and a damper 6, wherein the high-temperature oil tank 2 is arranged on one side of the test box body 1, the high-temperature oil pump 3 is connected to the high-temperature oil tank 2, the heat exchanger 4 is fixedly connected to the test box body 1 and is connected to the high-temperature oil pump 3, the blower 5 is fixedly connected to the test box body 1 and is located on one side of the test box body 1, and the damper 6 is arranged on one side of the test box body 1.

[0020] In this embodiment, the high temperature oil tank 2, the high temperature oil pump 3 and the heat exchanger 4 are connected by a heating pipeline, the heating pipeline is made of stainless steel pipe, there are electric regulating valves, temperature sensors and other devices on the pipeline, the pipeline is wrapped with high-resistant insulation materials, the heat exchanger 4 is a fin heat exchanger 4, with a large enough heat exchange area (see the technical part for specific data), to ensure the requirement of rapid heating,: air volume 5184m 3 / h, air inlet temperature 55℃, air outlet temperature 119℃, oil inlet temperature 250℃, oil outlet temperature 230℃, heat exchange 99.9kw, air pressure drop 186pa, oil pressure drop 15.27kpa, oil circulation volume 9.72m 3 / h, the heat exchange area of ​​the heat exchanger 4 is 60.2m 2, 1100mm long, 500mm wide, 470mm high. ; The blower 5 is mainly used to quickly replace the heated high-temperature air with the test box body 1 to achieve the purpose of heating and cooling the test box body 1. The test box body 1 provides installation conditions for the heat exchanger 4, the blower 5 and the damper 6. When the test box body 1 needs to be heated, the high-temperature oil tank 2 works to preheat the intermediate medium silicone oil in the high-temperature oil tank 2, and the high-temperature oil pump 3 is started at the same time. The high-temperature oil pump 3 transports the preheated silicone oil to the heat exchanger 4 to heat the heat exchanger 4 until the temperature reaches the preset value to achieve the heating of the test box body 1. When cooling is required, the high-temperature oil tank 2 and the heat exchanger 4 stop working, and the damper 6 is opened at the same time, and the blower 5 works to cool the test box body 1, thereby solving the problem that the existing high-temperature and low-temperature test box cannot meet the requirements of explosion-proof and efficient high and low temperature adjustment.

[0021] Furthermore, the high-temperature oil tank 2 includes an oil tank body 21, multiple explosion-proof heating pipes 22 and an over-temperature sensor 23. The oil tank body 21 is arranged on one side of the test box body 1, and the multiple explosion-proof heating pipes 22 are respectively fixedly connected to the oil tank body 21 and are all located inside the oil tank body 21. The over-temperature sensor 23 is fixedly connected to the oil tank body 21 and is located on one side of the oil tank body 21.

[0022] In this embodiment, there is a liquid level on the oil tank body 21, the oil tank capacity is 100L, and the maximum oil capacity is 80L. The intermediate medium silicone oil can be stored through the oil tank body 21. The multiple explosion-proof heating pipes 22 can heat the intermediate medium silicone oil in the oil tank body 21. The temperature of the intermediate medium silicone oil in the oil tank body 21 can be detected and controlled by the over-temperature sensor 23. The explosion-proof heating pipe 22 is composed of a filler (magnesium oxide, which has the function of heat conduction and insulation), a shell (stainless steel, carbon steel, titanium, copper, etc.), a ceramic head (function: insulation), and an explosion-proof box. When the explosion-proof heating pipe 22 is working, the low-temperature fluid medium enters its input port through the pipeline under pressure, along the specific heat exchange flow channel inside the electric heating container, and takes away the high-temperature heat energy generated by the electric heating component in the air heating pipe during operation, so that the temperature of the heated medium in the air heating pipe is increased.

[0023] Furthermore, the high-temperature oil pump 3 includes an oil pump body 31 and an oil pressure switch 32 . The oil pump body 31 is fixedly connected to the oil tank body 21 and is located in communication with the oil tank body 21 . The oil pressure switch 32 is in communication with the oil pump body 31 and is in communication with the heat exchanger 4 .

[0024] In this embodiment, the silicone oil in the oil tank body 21 can be transferred to the heat exchanger 4 through the oil pump body 31, and the output of the oil pump body 31 can be controlled by the oil pressure switch 32. The oil pump body 31 adopts a magnetic drive pump without a shaft seal structure, which reduces the risk of leakage caused by aging of the sealing ring.

[0025] Furthermore, the damper 6 includes a pneumatic push rod 61, a connecting rod 62, a baffle 63 and a solenoid valve 64. The pneumatic push rod 61 is fixedly connected to the test box body 1 and is located on one side of the test box body 1. The connecting rod 62 is fixedly connected to the output end of the pneumatic push rod 61. The baffle 63 is fixedly connected to the connecting rod 62 and is located on one side of the connecting rod 62. The solenoid valve 64 is fixedly connected to the pneumatic push rod 61 and is located on one side of the pneumatic push rod 61.

[0026] In this embodiment, the baffle 63 is connected to the pneumatic push rod 61 through the connecting rod 62, thereby preventing the high temperature in the box from being directly transmitted to the pneumatic push rod 61; the solenoid valve 64 is used to switch the flow direction of compressed air to change the movement direction of the pneumatic push rod 61.

[0027] High-temperature preheating process: In the process of high-speed temperature rise and fall, in order to achieve rapid temperature rise, the intermediate heat exchange medium (oil) needs to be preheated; before the program reaches high temperature (preheating can also be turned on manually), the explosion-proof heating pipe 22 heats the oil in the oil tank body 21, and at the same time the oil pump body 31 starts to run, pumping the oil in the oil tank body 21 into the heat exchanger 4, and the heat exchanger 4 heats the test chamber body 1. When the temperature reaches the preset temperature, the system automatically adjusts the heating power; at this time, the damper 6 of the test chamber body 1 is in a closed state, that is, the working room and the high-temperature chamber are in a temperature isolation state.

[0028] High temperature heating process: When the temperature in the working room needs to be increased, the heating system enters the high temperature heating process; during this process, the damper 6 and the blower 5 are opened, and the heat at high temperature is exchanged to the test box body 1, and the PLC coordinates the heater for rapid heating.

[0029] High temperature constant temperature process: When the temperature reaches the required temperature, the explosion-proof heating tube 22 stops heating, reduces the output of the oil pump body 31 to the heat exchanger 4, and adjusts the opening amount of the damper 6 to minimize the temperature overshoot; during the constant temperature process, when the liquid temperature is consistent with the design temperature in the oil tank body 21, the heating constant temperature mode is turned on to maintain the consistency of the oil temperature in the oil tank body 21; if the box temperature setting value becomes higher, the PLC system automatically adjusts the heating power to achieve the purpose of continuous temperature increase in the box, and the maximum rate of continuous temperature increase can reach 19.9℃ / min (see calculation); within the capacity range, the temperature can be increased according to the set requirements. That is, when the box body achieves the requirement of rapid temperature change (70℃ / min), the heating system needs to be preheated. When the rate is lower than the temperature increase requirement of 19.9℃ / min, the heating system does not need to be preheated and can be directly heated.

[0030]

[0031] Q1: air heating load, Q2: liner heating load, Q3: insulation layer heat conduction load, Q4: fan load, Q5: mass load, ai: load coefficient, mi: mass of each sub-load, ci: specific heat of each sub-load, n: number of circulating fans, Pe: circulating fan power.

[0032] Thermal oil selection

[0033] Model IOTA-255A, operating temperature -70℃-320℃.

[0034] According to the requirements of temperature range, thermal conductivity, specific heat, viscosity, safety, etc., phenylmethyl silicone oil is selected as the heating medium, and the performance parameters are as follows:

[0035] Heat exchanger 4

[0036] The calculation results of the heat exchanger 4 are as follows: air volume 5184m 3 / h, air inlet temperature 55℃, air outlet temperature 119℃, oil inlet temperature 250℃, oil outlet temperature 230℃, heat exchange 99.9kw, air pressure drop 186pa, oil pressure drop 15.27kpa, oil circulation volume 9.72m 3 / h, heat exchange area of ​​heat exchanger 4 is 60.2m 2 , length 1100mm, width 500mm, height 470mm.

[0037] The oil pump body 31: The oil pressure drop of the entire oil circuit is 3 times the pressure drop of the heat exchanger 4, that is, 45.81kpa, and the oil circulation volume is 9.72m 3 / h, the oil pump is MDZ-40 with a rated power of 3kw.

[0038] The fuel tank design

[0039]

[0040] Q: Heating load, 94.2kw, c1: Average specific heat of oil at 100-150℃, take 2.25kj / kg.℃, ρ1: Average density of oil at 100-150℃, take 0.8kg / L, ci: Specific heat of each mass part of the oil circulation pipeline, take 0.46kj / kg.℃, mi: Mass of each mass part of the oil circulation pipeline, V1: Internal volume of heat exchanger 4 in the box, 15.2L, V2: Internal volume of oil pipeline 5L.

[0041] There is a liquid level on the fuel tank, the fuel tank capacity is 100L, and the maximum fuel capacity is 80L;

[0042] According to load calculation, the maximum heating load is 94.2kw and the heater design power is 96kw;

[0043] See also Figure 2 In the second aspect, a method for rapidly heating and cooling an incubator with electric explosion-proof heating is applied to the incubator rapidly heating and cooling an incubator with electric explosion-proof heating system as described in the first aspect, comprising the following steps:

[0044] S1 high temperature oil tank 2 works to preheat the intermediate medium silicone oil in the high temperature oil tank 2;

[0045] Specifically, the plurality of explosion-proof heating tubes 22 work to heat the intermediate medium silicone oil in the oil tank body 21 , and the temperature of the intermediate medium silicone oil in the oil tank body 21 can be detected and controlled by the over-temperature sensor 23 .

[0046] S2: starting the high temperature oil pump 3 to deliver the preheated silicone oil to the heat exchanger 4, heating the heat exchanger 4 until the temperature reaches a preset value to heat the test box body 1;

[0047] Specifically, the oil pressure switch 32 is turned on, and the output of the oil pump body 31 can transfer the silicone oil in the oil tank body 21 to the heat exchanger 4 .

[0048] S3 the high temperature oil tank 2 and the heat exchanger 4 stop working, the damper 6 is opened and the blower 5 is opened to cool down the test box body 1.

[0049] Specifically, the plurality of explosion-proof heating tubes 22 stop heating to reduce the output of the oil pump body 31 to the heat exchanger 4 , the starting push rod works to drive the connecting rod 62 to open the baffle 63 , and the blower 5 works to cool down the test box body 1 .

[0050] The above disclosure is only a preferred embodiment of the temperature box rapid heating and cooling electric explosion-proof heating system and method of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention are still within the scope of the invention.

Claims

1. A temperature box rapid temperature rise and fall electric explosion-proof heating system, characterized in that: It includes a test box body, a high-temperature oil tank, a high-temperature oil pump, a heat exchanger, a blower and a damper. The high-temperature oil tank is arranged on one side of the test box body, the high-temperature oil pump is connected to the high-temperature oil tank, the heat exchanger is fixedly connected to the test box body and is connected to the high-temperature oil pump, the blower is fixedly connected to the test box body and is located on one side of the test box body, and the damper is arranged on one side of the test box body.

2. The temperature box rapid temperature rise and fall electric explosion-proof heating system according to claim 1, characterized in that: The high-temperature oil tank includes an oil tank body, multiple explosion-proof heating tubes and an over-temperature sensor. The oil tank body is arranged on one side of the test box body. The multiple explosion-proof heating tubes are respectively fixedly connected to the oil tank body and are all located in the oil tank body. The over-temperature sensor is fixedly connected to the oil tank body and is located on one side of the oil tank body.

3. The electric explosion-proof heating system for rapid temperature rise and fall of a temperature box as claimed in claim 2, characterized in that: The high-temperature oil pump comprises an oil pump body and an oil pressure switch. The oil pump body is fixedly connected to the oil tank body and is located in communication with the oil tank body. The oil pressure switch is in communication with the oil pump body and the heat exchanger.

4. The electric explosion-proof heating system for rapidly heating and cooling a temperature box as claimed in claim 3, characterized in that: The damper includes a pneumatic push rod, a connecting rod, a baffle and a solenoid valve. The pneumatic push rod is fixedly connected to the test box body and is located on one side of the test box body. The connecting rod is fixedly connected to the output end of the pneumatic push rod. The baffle is fixedly connected to the connecting rod and is located on one side of the connecting rod. The solenoid valve is fixedly connected to the pneumatic push rod and is located on one side of the pneumatic push rod.

5. A method for rapid temperature rise and fall of electric explosion-proof heating in a temperature box, applied to the rapid temperature rise and fall of electric explosion-proof heating system in a temperature box according to any one of claims 1 to 4, characterized in that: The following steps are involved: The high temperature oil tank works to preheat the intermediate medium silicone oil in the high temperature oil tank; The high-temperature oil pump is started to deliver the preheated silicone oil to the heat exchanger, and the heat exchanger is heated until the temperature reaches a preset value to heat the test box body; The high temperature oil tank and the heat exchanger stop working, and the damper is opened and the blower is opened to cool down the test box body.

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