CN113797983A - Door frame heating method, device and system of test box - Google Patents
Door frame heating method, device and system of test box Download PDFInfo
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- CN113797983A CN113797983A CN202111066907.4A CN202111066907A CN113797983A CN 113797983 A CN113797983 A CN 113797983A CN 202111066907 A CN202111066907 A CN 202111066907A CN 113797983 A CN113797983 A CN 113797983A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/32—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature with provision for adjustment of the effect of the auxiliary heating device, e.g. a function of time
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Abstract
The embodiment of the invention discloses a method, a device and a system for heating a door frame of a test box. The door frame heating method of the test chamber comprises the following steps: acquiring the temperature in the test chamber and the temperature of the external environment; determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature; and determining the door frame heating amount of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box. The door frame heating method, the door frame heating device and the door frame heating system of the test box provided by the embodiment of the invention can improve the reliability of door frame heating.
Description
Technical Field
The embodiment of the invention relates to a temperature control technology, in particular to a method, a device and a system for heating a door frame of a test box.
Background
With the application of test chambers such as environmental test chambers in various industries becoming more and more extensive, the requirements for the use experience and safety of products become higher and higher. The test requirements of different products are different, the lowest temperature in the environment test box can be as low as-70 ℃ when the environment test box works, and when the environment test box runs at low temperature, part of cold energy can be conducted out of the box through the structural part. Due to the difference of production processes and the use of heat insulation materials, the cold energy transmitted from the positions of the door frame and the window frame of the environmental test chamber may cause condensation or frost formation, and the door frame of the test chamber needs to be heated to offset the cold energy, so that the aims of defrosting and dehumidifying are fulfilled.
At present, the door frame heating method of the existing test box heats the door frame when the temperature in the box of the test box is lower than 8 ℃ under the common condition, but because the low-temperature tests of different products require different requirements, different external environments and even different seasons, the heating quantity of a heating wire for heating the door frame cannot be automatically adapted, the surface temperature of the door frame is difficult to control, if the condensation cannot be effectively removed, the water drops on the door frame of the device or the surface temperature is higher, even nearby working personnel can be scalded, and the heating reliability is influenced.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for heating a door frame of a test box, which are used for improving the reliability of door frame heating.
In a first aspect, an embodiment of the present invention provides a method for heating a door frame of a test chamber, including:
acquiring the temperature in the test chamber and the temperature of the external environment;
determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature;
and determining the door frame heating amount of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box.
Optionally, according to the temperature range in the preset box, the preset ambient temperature range, the first difference and the second difference, the door frame heating amount of the test box is determined, and the method comprises the following steps:
determining the heating quantity required by the cold quantity conduction in the test box according to the preset temperature range in the test box and the first difference value, and determining the heating quantity required by the surface of the box body of the test box according to the preset environment temperature range and the second difference value;
and determining the door frame heating amount of the test box according to the heating amount required by the cold conduction in the box and the heating amount required by the surface of the box body.
Optionally, determining the heating amount required by the cold quantity conducted in the test box according to the preset temperature range in the test box and the first difference, including:
determining the difference between the maximum value and the minimum value of the preset in-box temperature range according to the preset in-box temperature range;
determining the heating quantity OUT1 required by the cold conduction quantity in the box according to the first difference value and the difference between the maximum value and the minimum value of the preset temperature range in the box; OUT1 is ABS (T1-TC2)/(TC2-TC1) 60 100%, T1-TC2 is a first difference, ABS (T1-TC2) represents an absolute value of T1-TC2, and TC2-TC1 is a difference between a maximum value and a minimum value of the preset in-tank temperature range.
Optionally, determining the amount of heating required on the surface of the box body of the test box according to the preset environmental temperature range and the second difference value, including:
determining the difference between the maximum value and the minimum value of the preset environment temperature range according to the preset environment temperature range;
determining the required heating quantity OUT2 of the surface of the box body according to the second difference value and the difference between the maximum value and the minimum value of the preset environment temperature range; OUT2 ═ 30+ (T2-TE1)/(TE2-TE1) × 10] × 100%, T2-TE1 are the second difference, and TE2-TE1 are the difference between the maximum value and the minimum value of the preset ambient temperature range.
Optionally, according to the required heating volume of cold volume of conduction in the case and the required heating volume on box surface, confirm the door frame heating volume of proof box, include:
determining the sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box according to the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box;
taking the sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box body as the door frame heating quantity OUT; OUT [ [ ABS (T1-TC2)/(TC2-TC1) × 60+30+ (T2-TE1)/(TE2-TE1) × 10] × 100 ], T1-TC2 are first differences, ABS (T1-TC2) represents absolute values of T1-TC2, TC2-TC1 is a difference between a maximum value and a minimum value of a preset in-tank temperature range, T2-TE1 are second differences, and TE2-TE1 is a difference between a maximum value and a minimum value of a preset ambient temperature range.
Optionally, the temperature reached by the heated door frame is lower than 40 ℃.
In a second aspect, an embodiment of the present invention further provides a door frame heating apparatus for a test chamber, including:
the temperature acquisition module is used for acquiring the temperature in the test chamber and the temperature of the external environment;
the difference value determining module is used for determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature;
and the heating quantity determining module is used for determining the door frame heating quantity of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box.
In a third aspect, an embodiment of the present invention further provides a door frame heating system of a test chamber, including: a temperature sensor, a controller, a solid-state relay and a heating wire, wherein the door frame heating device of the test chamber is integrated in the controller; the temperature sensor and the solid-state relay are both electrically connected with the controller, and the heating wire is electrically connected with the solid-state relay.
Optionally, the temperature sensor includes an in-box temperature sensor and an ambient temperature sensor, and both the in-box temperature sensor and the ambient temperature sensor are electrically connected to the controller.
Optionally, the heating wire is arranged in a door frame of the test box, and the heating wire is a parallel constant-power heating wire.
According to the door frame heating method, the door frame heating device and the door frame heating system of the test box, the temperature in the test box and the temperature of an external environment of the test box are obtained; determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature; and determining the door frame heating amount of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box. According to the door frame heating method, the door frame heating device and the door frame heating system of the test box, provided by the embodiment of the invention, the door frame heating amount of the test box is calculated according to the preset box internal temperature range, the preset environment temperature range, the first difference value and the second difference value, the door frame heating amount is determined, the automatic adaptation of the door frame heating amount under different box internal temperatures and different environment temperatures can be realized, the door frame surface temperature can be further controlled, and the heating reliability is improved.
Drawings
Fig. 1 is a flowchart of a method for heating a door frame of a test chamber according to an embodiment of the present invention;
FIG. 2 is a block diagram of a door frame heating system of a test chamber according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for heating a door frame of a test chamber according to a second embodiment of the present invention;
fig. 4 is a block diagram of a door frame heating device of a test chamber according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a door frame heating method of a test chamber according to an embodiment of the present invention, where the embodiment is applicable to heating a door frame of the test chamber, and the method can be performed by a door frame heating device of the test chamber, and the door frame heating device of the test chamber can be integrated into a controller in a door frame heating system of the test chamber, and specifically includes the following steps:
and step 110, acquiring the temperature in the test chamber and the temperature of the external environment.
Wherein, the proof box can be the proof box that is used for the tolerant temperature of test product or equipment, and the incasement temperature and the external environment temperature of proof box can be detected respectively by incasement temperature sensor and ambient temperature sensor and obtain, and the door frame heating device of proof box can be connected with incasement temperature sensor and ambient temperature sensor electricity to acquire the incasement temperature and the external environment temperature of proof box respectively through incasement temperature sensor and ambient temperature sensor.
Specifically, fig. 2 is a block diagram of a door frame heating system of a test chamber according to a third embodiment of the present invention, and referring to fig. 2, the door frame heating system of the test chamber includes: the temperature sensor 10, the controller 20, the solid-state relay 30 and the heating wire 40, the door frame heating device of the test chamber according to any embodiment of the invention is integrated in the controller 20; the temperature sensor 10 and the solid-state relay 30 are both electrically connected to the controller 20, and the heater wire 40 is electrically connected to the solid-state relay 30. The controller 20 may control the on-off time of the solid state relay 30, thereby controlling the heating time of the heater wire 40.
The temperature sensor 10 includes an in-box temperature sensor 11 and an ambient temperature sensor 12, both of which are electrically connected to the controller 20. The in-box temperature sensor 11 and the ambient temperature sensor 12 may detect the in-box temperature and the external ambient temperature of the test box, respectively, and transmit the detected temperatures to the controller 20, so that the controller 20 may acquire the in-box temperature and the external ambient temperature. The heating wire 40 may be disposed in a door frame of the test chamber, and the heating wire 40 is a parallel constant power heating wire. Specifically, the heating wire 40 may be hermetically disposed in a door frame of the test chamber to heat the door frame, and the heating wire 40 may be a plurality of sections of heating wires 40 with the same power, which are connected in parallel, so that the heating wire 40 uniformly heats the door frame. The type, including the power level, of the heating wire 40 may be specifically set according to actual requirements, and is not limited herein.
And 120, determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature.
Specifically, the specific ranges of the preset in-tank temperature range and the preset ambient temperature range may be stored in the controller 20 in advance. Illustratively, the preset in-box temperature range may be 70 degrees below zero to 180 degrees, and the preset ambient temperature may be 5 degrees to 35 degrees. For example, if the internal temperature is-10 degrees, and the preset internal temperature range is-70 to 180 degrees, the controller 20 may determine that the first difference is 190 degrees, the external environment temperature is 30 degrees, and the preset internal temperature range is 5 to 35 degrees, and the second difference is 25 degrees.
And step 130, determining the heating quantity of the door frame of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box.
Specifically, the door frame heating amount of the test chamber is positively correlated with the absolute value of the first difference and the second difference, and negatively correlated with the difference between the maximum value and the minimum value of the preset temperature range in the test chamber and the difference between the maximum value and the minimum value of the preset environment temperature range. The door frame heating amount can be embodied in a percentage form, the controller 20 can generate a corresponding signal according to the determined door frame heating amount, if the door frame heating amount is determined to be 50%, the controller 20 can generate a signal with a duty ratio of 50%, that is, the controller 20 controls the proportion of the conduction time of the solid-state relay 30 to the time period (the specific numerical value of the time period can be set according to the actual situation), so as to control the heating time of the heating wire 40, thereby realizing the adjustable control of the door frame temperature.
According to the door frame heating method of the test chamber provided by the embodiment, the temperature in the test chamber and the temperature of the external environment are obtained; determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature; and determining the door frame heating amount of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box. According to the door frame heating method of the test box, the door frame heating amount of the test box is calculated according to the preset box internal temperature range, the preset environment temperature range, the first difference value and the second difference value, the door frame heating amount is determined, automatic adaptation of the door frame heating amount under different box internal temperatures and different environment temperatures can be achieved, the door frame surface temperature can be controlled, and the heating reliability is improved.
Example two
Fig. 3 is a flowchart of a door frame heating method of a test chamber according to a second embodiment of the present invention, where the second embodiment is applicable to heating a door frame of the test chamber, and the method can be performed by a door frame heating device of the test chamber, and the door frame heating device of the test chamber can be integrated into a controller in a door frame heating system of the test chamber, and specifically includes the following steps:
and step 210, acquiring the temperature in the test chamber and the temperature of the external environment.
Specifically, referring to fig. 2, the in-box temperature sensor 11 and the ambient temperature sensor 12 may detect an in-box temperature and an external ambient temperature of the test box, respectively, and transmit the detected temperatures to the controller 20, so that the controller 20 may acquire the in-box temperature and the external ambient temperature.
And step 220, determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature.
Specifically, if the internal temperature is T1, the external ambient temperature is T2, the preset internal temperature range is TC1 to TC2, and the preset ambient temperature range is TE1 to TE2, the controller 20 may determine that the first difference is T1 to TC2 and the second difference is T2 to TE 1.
And step 230, determining the difference between the maximum value and the minimum value of the preset in-box temperature range according to the preset in-box temperature range.
Wherein the preset temperature range in the box is TC 1-TC2, TC2 is larger than TC1, and the difference between the maximum value and the minimum value of the preset temperature range in the box is TC2-TC 1.
And 240, determining the heating quantity OUT1 required by the cold conduction in the box according to the first difference value and the difference between the maximum value and the minimum value of the preset box temperature range.
OUT1 is ABS (T1-TC2)/(TC2-TC1) 60 100%, T1-TC2 is a first difference, ABS (T1-TC2) represents an absolute value of T1-TC2, and TC2-TC1 is a difference between a maximum value and a minimum value of the preset in-tank temperature range.
And step 250, determining the difference between the maximum value and the minimum value of the preset environment temperature range according to the preset environment temperature range.
Specifically, the preset ambient temperature range is TE1 to TE2, and TE2 is greater than TE1, and the difference between the maximum value and the minimum value of the preset ambient temperature range is TE2 to TE 1.
And step 260, determining the required heating quantity OUT2 of the surface of the box body according to the second difference value and the difference between the maximum value and the minimum value of the preset environment temperature range.
OUT2 ═ 30+ (T2-TE1)/(TE2-TE1) × 10] × 100%, T2-TE1 are the second difference, and TE2-TE1 are the difference between the maximum value and the minimum value of the preset ambient temperature range.
And 270, determining the sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box according to the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box.
The sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box body is the sum of the OUT1 and the OUT 2.
And step 280, taking the sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box body as a door frame heating quantity OUT to heat the door frame of the test box.
The door frame heating amount OUT of the test box is OUT1+ OUT2, and as can be seen from the expressions of OUT1 and OUT2, OUT is 100% of ABS (T1-TC2)/(TC2-TC1) 60+30+ (T2-TE1)/(TE2-TE1) 10. The controller 20 can control the on-off time of the solid-state relay 30 according to the determined door frame heating amount OUT, if OUT is 80%, a signal with a duty ratio of 80% can be generated, and if the signal period is 10 minutes, the solid-state relay 30 can be controlled to be switched off for 2 minutes according to 8 minutes of switching on and switching off circularly, so that the heating time of the heating wire 40 is controlled, and the adjustable control of the door frame temperature is realized. Exemplarily, the temperature that reaches after the door frame heats is less than 40 degrees, can prevent that the overheated staff of scalding of door frame.
According to the door frame heating method of the test chamber provided by the embodiment, the temperature in the test chamber and the temperature of the external environment are obtained; determining a first difference value between the internal temperature and the maximum value of the preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature; according to the preset temperature range in the box, the preset environment temperature range, the first difference value and the second difference value, the heating quantity required by the cold quantity conducted in the box and the heating quantity required by the surface of the box are determined, and the sum of the heating quantity required by the cold quantity conducted in the box and the heating quantity required by the surface of the box is used as the heating quantity of the door frame so as to heat the door frame of the test box. According to the door frame heating method of the test box, the door frame heating amount of the test box is calculated according to the preset box internal temperature range, the preset environment temperature range, the first difference value and the second difference value, the door frame heating amount is determined, automatic adaptation of the door frame heating amount under different box internal temperatures and different environment temperatures can be achieved, the door frame surface temperature can be controlled, and the heating reliability is improved.
EXAMPLE III
Fig. 4 is a structural block diagram of a door frame heating device of a test chamber according to a third embodiment of the present invention, where the door frame heating device of the test chamber includes: a temperature acquisition module 310, a difference determination module 320, and a heating amount determination module 330; the temperature obtaining module 310 is configured to obtain an inside temperature and an outside environment temperature of the test chamber; the difference determining module 320 is configured to determine a first difference between the internal temperature and a maximum value of a preset internal temperature range, and a second difference between the external temperature and a minimum value of the preset internal temperature range, according to the internal temperature and the external temperature; the heating amount determining module 330 is configured to determine a heating amount of the door frame of the test chamber according to a preset in-chamber temperature range, a preset ambient temperature range, a first difference value and a second difference value, so as to heat the door frame of the test chamber.
On the basis of the above embodiment, the heating amount determination module 330 includes: a first heating amount determining unit and a second heating amount determining unit; the first heating capacity determining unit is used for determining the heating capacity required by the cold conduction capacity in the test box according to the preset temperature range in the test box and the first difference value, and determining the heating capacity required by the surface of the box body of the test box according to the preset environment temperature range and the second difference value; the second heating capacity determining unit is used for determining the door frame heating capacity of the test box according to the heating capacity required by the cold conducted in the box and the heating capacity required by the surface of the box body.
Preferably, the first heating amount determining unit includes a first difference determining sub-unit and a first heating amount determining sub-unit; the first difference determining subunit is used for determining the difference between the maximum value and the minimum value of the preset in-box temperature range according to the preset in-box temperature range; the first heating quantity determining subunit is used for determining a heating quantity OUT1 required by cold quantity conduction in the box according to the first difference value and the difference between the maximum value and the minimum value of the preset box temperature range; OUT1 is ABS (T1-TC2)/(TC2-TC1) 60 100%, T1-TC2 is a first difference, ABS (T1-TC2) represents an absolute value of T1-TC2, and TC2-TC1 is a difference between a maximum value and a minimum value of the preset in-tank temperature range.
Preferably, the first heating amount determining unit includes a second difference determining sub-unit and a second heating amount determining sub-unit; the second difference determining subunit is configured to determine, according to the preset ambient temperature range, a difference between a maximum value and a minimum value of the preset ambient temperature range; the second heating quantity determining subunit is used for determining the required heating quantity OUT2 of the surface of the box body according to the second difference value and the difference between the maximum value and the minimum value of the preset environment temperature range; OUT2 ═ 30+ (T2-TE1)/(TE2-TE1) × 10] × 100%, T2-TE1 are the second difference, and TE2-TE1 are the difference between the maximum value and the minimum value of the preset ambient temperature range.
Preferably, the second heating amount determining unit includes a sum of heating amounts determining subunit and a third heating amount determining subunit; the heating quantity sum determining subunit is used for determining the sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box according to the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box; the third heating capacity determining subunit is used for taking the sum of the heating capacity required by the cold conduction in the box and the heating capacity required by the surface of the box body as the door frame heating capacity OUT of the test box; the door frame heating amount OUT of the test box is [ ABS (T1-TC2)/(TC2-TC1) + 60+30+ (T2-TE1)/(TE2-TE1) × 10 ]. 100%, T1-TC2 is a first difference value, ABS (T1-TC2) represents an absolute value of T1-TC2, TC2-TC1 is the difference between the maximum value and the minimum value of a preset box temperature range, T2-TE1 is a second difference value, and TE2-TE1 is the difference between the maximum value and the minimum value of the preset environment temperature range.
The door frame heating device provided by the embodiment and the door frame heating method provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and detailed technical details in the embodiment are not shown in the door frame heating method provided by any embodiment of the invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for heating a door frame of a test chamber is characterized by comprising the following steps:
acquiring the temperature in the test chamber and the temperature of the external environment;
determining a first difference value between the internal temperature and the maximum value of a preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature;
and determining the heating quantity of the door frame of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box.
2. The method for heating a door frame of a test chamber according to claim 1, wherein the determining the heating amount of the door frame of the test chamber according to the preset chamber internal temperature range, the preset environment temperature range, the first difference value and the second difference value includes:
determining the heating quantity required by the cold conduction in the test box according to the preset temperature range in the test box and the first difference, and determining the heating quantity required by the surface of the test box according to the preset environment temperature range and the second difference;
and determining the door frame heating amount of the test box according to the heating amount required by the cold conducted in the box and the heating amount required by the surface of the box body.
3. The method for heating the door frame of the test chamber according to claim 2, wherein the determining the heating amount required by the cold conduction in the test chamber according to the preset temperature range in the test chamber and the first difference comprises:
determining the difference between the maximum value and the minimum value of the preset in-box temperature range according to the preset in-box temperature range;
determining the heating quantity OUT1 required by the cold conduction quantity in the box according to the first difference value and the difference between the maximum value and the minimum value of the temperature range in the preset box; OUT1 ═ ABS (T1-TC2)/(TC2-TC1) × 60 × 100%, T1-TC2 are the first difference values, ABS (T1-TC2) represents the absolute value of T1-TC2, and TC2-TC1 are the differences between the maximum and minimum values of the preset in-tank temperature range.
4. The method for heating a door frame of a test chamber according to claim 2, wherein the determining the required heating amount of the surface of the chamber body of the test chamber according to the preset environmental temperature range and the second difference comprises:
determining the difference between the maximum value and the minimum value of the preset environment temperature range according to the preset environment temperature range;
determining the required heating quantity OUT2 of the surface of the box body according to the second difference value and the difference between the maximum value and the minimum value of the preset environment temperature range; and OUT2 ═ 30+ (T2-TE1)/(TE2-TE1) × 10] × 100%, T2-TE1 are the second difference values, and TE2-TE1 are the difference between the maximum value and the minimum value of the preset ambient temperature range.
5. A method for heating a door frame of a test chamber according to claim 2, wherein the step of determining the heating amount of the door frame of the test chamber according to the heating amount required for the cold conduction in the chamber and the heating amount required for the surface of the chamber body comprises the steps of:
determining the sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box according to the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box;
taking the sum of the heating quantity required by the cold conduction in the box and the heating quantity required by the surface of the box body as a door frame heating quantity OUT; OUT [ [ ABS (T1-TC2)/(TC2-TC1) × 60+30+ (T2-TE1)/(TE2-TE1) × 10] × 100 ], T1-TC2 being the first difference, ABS (T1-TC2) representing an absolute value of T1-TC2, TC2-TC1 being a difference between a maximum value and a minimum value of the preset in-tank temperature range, T2-TE1 being the second difference, and TE2-TE1 being a difference between a maximum value and a minimum value of the preset ambient temperature range.
6. A method as claimed in claim 1, wherein the door frame is heated to a temperature of less than 40 degrees.
7. A door frame heating device of a test chamber is characterized by comprising:
the temperature acquisition module is used for acquiring the temperature in the test chamber and the temperature of the external environment;
the difference value determining module is used for determining a first difference value between the internal temperature and the maximum value of a preset internal temperature range and a second difference value between the external environment temperature and the minimum value of the preset environment temperature range according to the internal temperature and the external environment temperature;
and the heating quantity determining module is used for determining the heating quantity of the door frame of the test box according to the preset in-box temperature range, the preset environment temperature range, the first difference value and the second difference value so as to heat the door frame of the test box.
8. A door frame heating system of a test chamber, comprising: a temperature sensor, a controller, a solid state relay and a heater wire, wherein the door frame heating device of the test chamber of claim 7 is integrated in the controller; the temperature sensor and the solid-state relay are electrically connected with the controller, and the heating wire is electrically connected with the solid-state relay.
9. The door frame heating system according to claim 8, wherein the temperature sensor includes an in-box temperature sensor and an ambient temperature sensor, both of which are electrically connected to the controller.
10. The door frame heating system of claim 8, wherein the heater wire is disposed within a door frame of the test chamber, the heater wire being a parallel constant power heater wire.
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| CN202111066907.4A CN113797983A (en) | 2021-09-13 | 2021-09-13 | Door frame heating method, device and system of test box |
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| CN202111066907.4A CN113797983A (en) | 2021-09-13 | 2021-09-13 | Door frame heating method, device and system of test box |
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Cited By (1)
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Application publication date: 20211217 |