CN114442696B - Temperature control system and method - Google Patents
Temperature control system and method Download PDFInfo
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- CN114442696B CN114442696B CN202210078627.3A CN202210078627A CN114442696B CN 114442696 B CN114442696 B CN 114442696B CN 202210078627 A CN202210078627 A CN 202210078627A CN 114442696 B CN114442696 B CN 114442696B
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Abstract
The utility model relates to the technical field of plate processing, in particular to a temperature control system, which comprises a heat conduction oil heater, a heating oil pipe connected with the heat conduction oil heater and an insulation box, wherein the heating oil pipe is arranged in the insulation box, and is characterized in that: the control system also comprises an input unit, a temperature sensor, a temperature regulating actuator and a controller, wherein the controller receives signals of the input unit and the temperature sensor and outputs the control signals for controlling the temperature regulating actuator; the temperature control method for the incubator comprises the following steps: s1, setting a target temperature value; s2, acquiring a detection temperature value; s3, calculating the ratio of the detected temperature value to the target temperature value; s4, determining a control signal according to the ratio; s5, controlling the temperature adjusting actuator according to the control signal; s6, repeatedly executing the steps S2, S3, S4 and S5 according to preset time intervals until the ratio is equal to 1.
Description
Technical Field
The utility model belongs to the technical field of plate processing, and particularly relates to a temperature control system and a temperature control method for an incubator in a plate purifying process.
Background
In the prior art, the release of formaldehyde in the plate is quickened through a heating mode so as to achieve the purpose of purifying the plate, the plate is placed in the heat insulation box in a specific implementation process, the formaldehyde release is quickened through heating in the heat insulation box so as to achieve a certain purifying effect, and the heat conduction oil pipe is generally adopted for heat exchange in the heating mode, so that the heat efficiency is higher, the heat exchange can be rapidly carried out, but for the heating heat insulation box, the control precision of the mode on the temperature is not high, and the deformation and the damage of the plate are possibly caused.
Disclosure of Invention
The utility model provides a temperature control system which aims at solving the problems and comprises a heat conduction oil heater, a heating oil pipe connected with the heat conduction oil heater and an insulation box, wherein the heating oil pipe is arranged in the insulation box, a proportional valve is arranged on the heating oil pipe, the temperature control system further comprises an input unit, a temperature sensor, a temperature regulation actuator and a controller, and the controller receives signals of the input unit and the temperature sensor and outputs control signals of the proportional valve.
The temperature control system comprises a heat conduction oil heater, a heating oil pipe connected with the heat conduction oil heater and an insulation box, wherein the heating oil pipe is arranged in the insulation box, the control system further comprises an input unit, a temperature sensor, a temperature adjusting actuator and a controller, and the controller receives signals of the input unit and the temperature sensor and outputs control signals for controlling the temperature adjusting actuator.
Further, the temperature adjusting actuator comprises a proportional valve arranged on the heating oil pipe, and/or an air outlet is arranged below the heating oil pipe, and an air inlet is arranged on a circulating fan on the upper portion of the heat insulation box.
Further, the method also comprises the following steps:
s1, setting a target temperature value;
s2, acquiring a detection temperature value;
s3, calculating the ratio of the detected temperature value to the target temperature value;
s4, determining a control signal according to the ratio;
s5, controlling the temperature adjusting actuator according to the control signal;
s6, repeatedly executing the steps S2, S3, S4 and S5 according to preset time intervals until the ratio is equal to 1.
Further, the control signals comprise opening control signals and/or power control signals, the control signals are used for adjusting the valve opening amount of the proportional valve and/or the output power of the circulating fan, and the valve opening amount of the proportional valve is the same as the change trend of the output power of the circulating fan;
further, the ratio and the valve opening amount of the proportional valve satisfy the following relationship:
wherein R represents the ratio, K represents the valve opening amount of the proportional valve, K max Represents the maximum valve opening amount, K of the proportional valve i The valve opening amount of the fine control corresponding to the fine control interval (0, A) 0 ]Is a coarse control interval, (A) 0 ，+∞]For the precise control interval, the A 0 Is a threshold fitted from historical data.
Further, R.epsilon.A 0 ，+∞]，K＝K i The method specifically comprises the following steps:
wherein K is 1 ＞K 2 ＞K 3 ＞K 4 ，A 0 ＜A 1 ＜A 2 ＜A 3 。
Further, when k=k 1 When the temperature rise speed in the corresponding incubator is V 1 ；
When k=k 2 When the temperature rise speed in the corresponding incubator is V 2 ；
When k=k 3 When the temperature rise speed in the corresponding incubator is V 3 ；
When k=k 4 When the temperature rise speed in the corresponding incubator is V 4 ；
Wherein V is 1 ＞V 2 ＞V 3 ＞V 4 。
Further, the K max 、K 1 、K 2 、K 3 、K 4 The difference between every two adjacent values satisfies the arithmetic relationship, namely:
K max -K 1 ＝K 1 -K 2 +Δ；
K 1 -K 2 ＝K 2 -K 3 +Δ；
K 2 -K 3 ＝K 3 -K 4 +Δ。
further, the ratio and the output power of the circulating fan satisfy the following relation:
wherein R represents the ratio, P represents the output power of the circulating fan, and P e Represents the rated power of a circulating fan, P i For the fine control output power corresponding to the fine control interval, (0, A) 0 ]Is coarse in sizeControl interval (A) 0 ，+∞]For the precise control interval, the A 0 Is a threshold fitted from historical data.
Further, R.epsilon.A 0 ，+∞]，P＝P i The method specifically comprises the following steps:
wherein P is 1 ＞P 2 ＞P 3 ＞P 4 ，A 0 ＜A 1 ＜A 2 ＜A 3 。
When p=p 1 When the temperature rise speed in the corresponding incubator is V 1 ；
When p=p 2 When the temperature rise speed in the corresponding incubator is V 2 ；
When p=p 3 When the temperature rise speed in the corresponding incubator is V 3 ；
When p=p 4 When the temperature rise speed in the corresponding incubator is V 4 ；
Wherein V is 1 ＞V 2 ＞V 3 ＞V 4 。
The P is e 、P 1 、P 2 、P 3 、P 4 The difference between every two adjacent values satisfies the arithmetic relationship, namely:
P e -P 1 ＝P 1 -P 2 +Δ；
P 1 -P 2 ＝P 2 -P 3 +Δ；
P 2 -P 3 ＝P 3 -P 4 +Δ。
the utility model has the following beneficial effects: the temperature control system statistical method is provided, the target temperature value and the detection temperature value are compared to obtain the ratio of the target temperature value and the detection temperature value, the opening of the proportional valve for controlling the flow of the heating oil pipe is controlled by taking the ratio as a basic factor of control logic, the temperature signal is received by a controller, and the control signal is output by comparison calculation, so that automatic and real-time temperature control is realized, the accuracy of temperature control in the incubator can be improved, the possibility of deformation of the plate is reduced, and the effective real-time formaldehyde purification is ensured.
Drawings
FIG. 1 is a schematic diagram of a temperature control system according to an embodiment of the present utility model;
FIG. 2 is a schematic view of a heating oil pipe according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a temperature control method according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a column diagram of an opening valve variation in an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a variation column of an output power meter in an embodiment of the utility model;
description of the drawings: the device comprises a heat insulation box 1, a heating oil pipe 2, a heat conduction oil heater 3, an input unit 4, a temperature sensor 5, a controller 6, a proportional valve 7, a circulating fan 8, a variable frequency pump 9 and a plate 10.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The technical means used in the examples are conventional means well known to those skilled in the art unless otherwise indicated.
In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
The board 10 of the present utility model has been studied to include types of particle board, solid board, and laminate, and therefore, according to the analysis of the critical value a 0 Related to the type, density, thickness, etc. of the sheet material 10In the case of experiments and studies on particle boards, it was found that when A 0 When=0.5, the higher the temperature in the incubator 1, the more severely the sheet 10 deforms, so when the particle board in the incubator 1 is subjected to formaldehyde removal treatment, a is selected 0 =0.5, and the corresponding coarse control interval is (0, 0.5]Is used in the range of (a), the fine control interval is (0.5, ++ infinity]。
Preferably, the utility model divides the fine control interval into four intervals, including a first fine control interval (A 0 ，A 1 ]A second fine control section (A 1 ，A 2 ]A third fine control section (A 2 ，A 3 ]Fourth fine control section (A 3 , +++, -infinity), in contrast to the three intervals of the prior art, the temperature in the incubator 1 can be controlled more precisely, so as to reduce the deformation rate and cracking degree of the plate 10 while meeting the requirements of heating and formaldehyde removal.
As a preferable solution, the placement mode of the board 10 refers to the application number CN 202121451608.8: the utility model relates to a wood-based material plate airing frame, wherein a plate 10 is arranged on the wood-based material plate airing frame and is in a vertical state, and when formaldehyde needs to be removed at a high temperature, the requirements are satisfied:
speed V of temperature rise in incubator 1 1 ＞V 2 ＞V 3 ＞V 4 ；
Valve opening amount K of proportional valve 7 1 ＞K 2 ＞K 3 ＞K 4 ；
K max -K 1 ＝K 1 -K 2 +Δ；
K 1 -K 2 ＝K 2 -K 3 +Δ；
K 2 -K 3 ＝K 3 -K 4 +Δ. Where delta is a tolerance determined according to the type, density, thickness, etc. of the sheet material.
Output power P of circulation fan 8 1 ＞P 2 ＞P 3 ＞P 4 ；
P e -P 1 ＝P 1 -P 2 +Δ；
P 1 -P 2 ＝P 2 -P 3 +Δ；
P 2 -P 3 ＝P 3 -P 4 +Δ. Where delta is a tolerance determined according to the type, density, thickness, etc. of the sheet material.
The first precise control interval is (A) 0 ，A 1 ]The second precise control interval is (A) 1 ，A 2 ]The third precise control interval is (A) 2 ，A 3 ]The fourth fine control interval is (A) 3 , + -infinity a) of the above-mentioned components, the A is 0 ＜A 1 ＜A 2 ＜A 3 ；
The change trend of the circulating fan 8 and the change trend of the proportional valve 7 are the same, and when the temperature rises, the circulating fan is ensured to be as follows:
when the ratio R is within the coarse control range (0, A 0 ]When the heating device is used, the valve opening amount of the proportional valve 7 is the largest, the output power of the circulating fan 8 is rated power, the air at the air outlet of the circulating fan 8 is blown into the inner cavity of the heat preservation box 1 after passing through the heating oil pipe 2, so that the heat of the heating oil pipe 2 is uniformly conducted into the heat preservation box 1, the upper part of the vertically placed plate 10 can be uniformly heated, the plate positioned in the heat preservation box 1 can be rapidly heated, the temperature rising speed corresponding to a coarse control interval is rapid, and the corresponding heat exchange acting on the plate 10 is relatively rapid.
When the ratio R is within the fine control range (0.5, +++), at this time, the valve opening amount of the proportional valve 7 is gradually reduced to 0%, the temperature rise rate corresponding to the precise control interval is gradually slow, the corresponding heat exchange acting on the plate 10 is also relatively gentle, the output power of the corresponding circulating fan 8 is gradually reduced until the output power is 0, and the probability of deformation and cracking of the plate 10 is reduced while the plate 10 which is vertically placed is ensured to be uniformly heated through bidirectional control so as to achieve the purpose of removing formaldehyde.
As shown in fig. 1-fig. 1, a temperature control system comprises a heat conducting oil heater 3, a heating oil pipe 2 connected with the heat conducting oil heater 3, and an insulation box 1, wherein the heating oil pipe 2 is arranged in the insulation box 1, a proportional valve 7 is arranged on the heating oil pipe 2, the control system further comprises an input unit 4, a temperature sensor 5 and a controller 6, and the controller 6 receives signals of the input unit 4 and the temperature sensor 5 and outputs control signals of the proportional valve 7.
The proportional valve 7 can adopt an electric proportional valve 7 or an electromagnetic proportional valve 7, the proportional valve 7 is arranged between the heat conduction oil heater 3 and the heat insulation box 1, the influence of high temperature and high humidity environment in the heat insulation box 1 is avoided, and the control precision, the durability and the like of the proportional valve can be ensured; the input unit 4 can adopt conventional human body input equipment to input a target temperature value to the controller 6, the temperature sensor 5 detects the current temperature value in the heat preservation box 1, the detection result is sent to the controller 6, the controller 6 sends a control signal to the proportional valve 7 to control the opening degree of the proportional valve 7, the part of the heating oil pipe 2 positioned in the heat preservation box 1 is heated, and the outer surface of the heating oil pipe 2 is provided with cooling fins to accelerate the heat exchange rate of the heating oil pipe 2 and air in the heat preservation box 1, so that the duration of the whole temperature control process is shortened, namely the purification duration of the plate 10 is shortened, and the improvement of productivity is facilitated; the controller 6 adopts a programmable logic controller 6, namely a PLC, based on the basic parameters and control logic of the system, the characteristics of reliability can be fully exerted by adopting the PLC, and the overall robustness of the system is improved.
The heat conducting oil heater 3 may be a special heater or a boiler to heat the heat conducting oil, and in general, the temperature of the heated oil in the heating oil pipe 2 when entering the heat insulation box 1 is about 220 ℃.
Preferably, the temperature control system further comprises a variable frequency pump 9, and the variable frequency pump 9 is located on an oil pipe outside the insulation box 1 and is used for conveying oil and pressurizing the oil.
Preferably, the temperature control system further comprises a circulating fan 8, and the circulating fan 8 is controlled by outputting a signal from the controller 6.
As the preferable scheme, the air outlet of the circulating fan 8 is arranged below the heating oil pipe 2, the air inlet of the circulating fan 8 is arranged on the upper portion of the heat insulation box 1, the air outlet of the circulating fan 8 is arranged below the heating oil pipe 2, the air flow rate near the heating oil pipe 2 is quickened, the heat exchange efficiency is further quickened, the air in the heat insulation box 1 circularly flows between the air inlet and the air outlet, the air in the whole heat insulation box 1 flows to form heat circulation, the uniform distribution of the temperature in the box body can be ensured, and the deformation of the plate 10 caused by the uneven local temperature distribution is avoided.
The utility model also provides a temperature control method for controlling the temperature of the incubator 1, which comprises the following steps:
s1, setting a target temperature value;
s2, acquiring a detection temperature value;
s3, calculating the ratio of the detected temperature value to the target temperature value;
s4, presetting a proportional valve 7 opening control signal corresponding to the ratio;
s5, determining an opening control signal of the proportional valve 7 according to the calculated ratio, and controlling the opening of the proportional valve 7 through the opening control signal of the proportional valve 7;
s6, repeatedly executing the steps S2, S3, S4 and S5 according to the preset time interval until the ratio is equal to 1.
The target temperature value is set through the input unit 4, the detected temperature value in the heat preservation box 1 is detected through the temperature sensor 5, the two values are sent to the controller 6 in a signal transmission mode, the controller 6 calculates the ratio of the detected temperature value to the target temperature value, the ratio reflects the difference between the current temperature and the target temperature, generally, the value is a certain value between 0 and 1, along with the purification operation, the temperature in the heat preservation box 1 approaches to the current room temperature, generally, a certain deviation exists between about 20 ℃ in winter and summer under the condition that the purification operation is performed for the first time, the target temperature value is set to 100 ℃, the ratio of the two values is 0.2, the meaning of the two values is obvious, the ratio is equal to 1, the final result of the whole temperature control process is understood, along with the purification operation, the temperature in the heat preservation box 1 reaches to the target temperature after a certain time, namely 100 ℃, the temperature change in the heat preservation box 1 is smaller, and the constant temperature can be realized through a small amount of thermal compensation.
The working temperature of the incubator 1 is generally 60-120 ℃, and the specific control mode is to control the flow of the hot oil in the heating oil pipe 2 by adjusting the opening of the proportional valve 7, so as to control the heat exchange rate.
As a preferred scheme, the detected temperature value is an average value of temperature values measured at a plurality of measuring points in the incubator 1, heat exchange is a process, the temperature of air near the heating oil pipe 2 is firstly increased and gradually diffused to the whole incubator 1 along with the time, then a plurality of temperature sensors 5 can be arranged for detecting for the accuracy of temperature detection, and the temperature sensors 5 are arranged at positions far away from the heating oil pipe 2, so that the average temperature of a plurality of measuring points is obtained to ensure that the measured temperature is closer to the actual temperature, thereby providing the accuracy of temperature control.
As a preferred scheme, the ratio is divided into a plurality of grades, the ratio of one grade corresponds to the opening control signal of one proportional valve 7, and for the plate 10, deformation is possibly generated under the heating condition, and the plate 10 can be well subjected to deformation protection in a stable heating state.
Preferably, the ratio and the opening degree of the proportional valve 7 satisfy the following relationship:
wherein R represents the ratio, K represents the opening of the proportional valve 7, K max Indicating the maximum opening of the proportional valve 7.
At the initial stage of the heating process, the temperature in the incubator 1 is within the tolerance range of the plate 10 and hardly deforms, at this time, more consideration can be given to saving time cost and accelerating the heat exchange rate, so that the heat exchange rate at the initial stage of heating can be controlled at a higher level, the proportional valve 7 reaches the maximum opening, after the heating is to a certain extent, the deformation risk of the plate 10 is increased, at this time, the heat exchange rate is reduced, and the plate 10 is protected for guiding the temperature rising.
Preferably, the maximum opening of the proportional valve 7 is 90%.
As a preferred embodiment, step S4 further includes: and presetting a control signal of the circulating fan 8 corresponding to the ratio, wherein the control signal of the circulating fan 8 controls the opening and closing of the circulating fan 8 and the output power.
As a preferable scheme, the ratio and the opening and closing and output power of the circulating fan 8 satisfy the following relationship:
wherein X is n Indicating that the circulating fan 8 is started, X f Represents that the circulating fan 8 is closed, P represents the output power of the circulating fan 8, and P e Indicating the rated power of the circulating fan 8.
According to the above embodiment, the strategy of taking both protection of the plate 10 and shortening of the purification process as main considerations is adopted, the opening, closing and output power control of the circulating fan 8 also adopt the same thought, the circulating fan 8 works at rated power in the initial stage of heating, the maximum air quantity is output, the heat exchange rate is increased, when the temperature reaches the temperature which can possibly influence the deformation of the plate 10, the output power is reduced, the efficiency of the heat exchange is reduced, the normally open of the circulating fan 8 is necessary, the aim is to ensure the uniform distribution of the temperature in the heat preservation box 1, the plate 10 is prevented from being deformed due to uneven surface heating, and of course, when the temperature in the heat preservation box 1 reaches the target temperature, the circulating fan 8 can be closed to achieve the effect of energy conservation, the temperature which can possibly influence the deformation of the plate 10 is not fixed, the material quality, the density, the thickness and the like of different plates 10 have influences, the corresponding data can be obtained through experiments for a limited time, the strategy of guiding the temperature control is required, and the relevant digital control of the temperature model can be fully developed in consideration of the temperature control in the research and development process of the equipment, the relevant digital control of the plate 10 is beneficial to the improvement of the digital control of the temperature.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. The utility model provides a temperature control system, includes conduction oil heater (3), with heating oil pipe (2) and insulation can (1) that conduction oil heater (3) are connected, heating oil pipe (2) set up in insulation can (1), its characterized in that: the control system further comprises an input unit (4), a temperature sensor (5), a temperature regulating actuator and a controller (6), wherein the controller (6) receives signals of the input unit (4) and the temperature sensor (5) and outputs control signals for controlling the temperature regulating actuator; the temperature-adjusting actuator comprises a proportional valve (7) arranged on the heating oil pipe (2) and a circulating fan (8) with an air outlet arranged below the heating oil pipe (2) and an air inlet arranged at the upper part in the heat-preserving box (1);
the controller (6) specifically performs the following steps:
s1, setting a target temperature value;
s2, acquiring a detection temperature value;
s3, calculating the ratio of the detected temperature value to the target temperature value;
s4, determining a control signal according to the ratio;
s5, controlling the temperature adjusting actuator according to the control signal;
s6, repeatedly executing the steps S2, S3, S4 and S5 according to a preset time interval until the ratio is equal to 1;
the control signals comprise opening control signals and power control signals, wherein the control signals are used for adjusting the valve opening amount of the proportional valve (7) and the output power of the circulating fan (8), and the valve opening amount of the proportional valve (7) is the same as the variation trend of the output power of the circulating fan (8);
the ratio and the valve opening amount of the proportional valve (7) satisfy the following relation:
wherein R represents the ratio, K represents the valve opening amount of the proportional valve (7), K max Represents the maximum valve opening amount, K, of the proportional valve (7) i Fine control valve corresponding to fine control intervalAmount of (0, A) 0 ]Is a coarse control interval, (A) 0 ,+∞]For the precise control interval, the A 0 A threshold value fitted according to the historical data;
said R epsilon (A) 0 ,+∞],K＝K i The method specifically comprises the following steps:
wherein K is 1 ＞K 2 ＞K 3 ＞K 4 ，A 0 ＜A 1 ＜A 2 ＜A 3 ，i＝1、2、3、4；
The K is max 、K 1 、K 2 、K 3 、K 4 The difference between every two adjacent values satisfies the arithmetic relationship, namely:
K max -K 1 ＝K 1 -K 2 +Δ；
K 1 -K 2 ＝K 2 -K 3 +Δ；
K 2 -K 3 ＝K 3 -K 4 +Δ；
when k=k 1 When the temperature in the corresponding incubator (1) rises at a speed V 1 ；
When k=k 2 When the temperature in the corresponding incubator (1) rises at a speed V 2 ；
When k=k 3 When the temperature in the corresponding incubator (1) rises at a speed V 3 ；
When k=k 4 When the temperature in the corresponding incubator (1) rises at a speed V 4 ；
Wherein V is 1 ＞V 2 ＞V 3 ＞V 4 。
2. A temperature control method of a temperature control system according to claim 1, for temperature control of an incubator (1), characterized by: the method comprises the following steps:
s1, setting a target temperature value;
s2, acquiring a detection temperature value;
s3, calculating the ratio of the detected temperature value to the target temperature value;
s4, determining a control signal according to the ratio;
s5, controlling the temperature adjusting actuator according to the control signal;
s6, repeatedly executing the steps S2, S3, S4 and S5 according to a preset time interval until the ratio is equal to 1;
the control signals comprise opening control signals and power control signals, wherein the control signals are used for adjusting the valve opening amount of the proportional valve (7) and the output power of the circulating fan (8), and the valve opening amount of the proportional valve (7) is the same as the variation trend of the output power of the circulating fan (8);
the ratio and the valve opening amount of the proportional valve (7) satisfy the following relation:
wherein R represents the ratio, K represents the valve opening amount of the proportional valve (7), K max Represents the maximum valve opening amount, K, of the proportional valve (7) i The valve opening amount of the fine control corresponding to the fine control interval (0, A) 0 ]Is a coarse control interval, (A) 0 ,+∞]For the precise control interval, the A 0 A threshold value fitted according to the historical data;
said R epsilon (A) 0 ,+∞],K＝K i The method specifically comprises the following steps:
wherein K is 1 ＞K 2 ＞K 3 ＞K 4 ，A 0 ＜A 1 ＜A 2 ＜A 3 ，i＝1、2、3、4；
The K is max 、K 1 、K 2 、K 3 、K 4 The difference between every two adjacent values satisfies the arithmetic relationship, namely:
K max -K 1 ＝K 1 -K 2 +Δ；
K 1 -K 2 ＝K 2 -K 3 +Δ；
K 2 -K 3 ＝K 3 -K 4 +Δ；
when k=k 1 When the temperature in the corresponding incubator (1) rises at a speed V 1 ；
When k=k 2 When the temperature in the corresponding incubator (1) rises at a speed V 2 ；
When k=k 3 When the temperature in the corresponding incubator (1) rises at a speed V 3 ；
When k=k 4 When the temperature in the corresponding incubator (1) rises at a speed V 4 ；
Wherein V is 1 ＞V 2 ＞V 3 ＞V 4 。
3. A temperature control method according to claim 2, characterized in that: the K is max 、K 1 、K 2 、K 3 、K 4 The difference between every two adjacent values satisfies the arithmetic relationship, namely:
K max -K 1 ＝K 1 -K 2 +Δ；
K 1 -K 2 ＝K 2 -K 3 +Δ；
K 2 -K 3 ＝K 3 -K 4 +Δ。
4. a temperature control method according to claim 2, characterized in that: the ratio and the output power of the circulating fan (8) meet the following relation:
wherein R represents the ratio, P represents the output power of the circulating fan (8), P e Represents the rated power, P, of the circulating fan (8) i For the fine control output power corresponding to the fine control interval, (0, A) 0 ]Is a rough control areaM, (A) 0 ,+∞]For the precise control interval, the A 0 Is a threshold fitted from historical data.
5. A temperature control method according to claim 4, wherein: said R epsilon (A) 0 ,+∞],P＝P i The method specifically comprises the following steps:
wherein P is 1 ＞P 2 ＞P 3 ＞P 4 ，A 0 ＜A 1 ＜A 2 ＜A 3 ，i＝1、2、3、4；
When p=p 1 When the temperature in the corresponding incubator (1) rises at a speed V 1 ；
When p=p 2 When the temperature in the corresponding incubator (1) rises at a speed V 2 ；
When p=p 3 When the temperature in the corresponding incubator (1) rises at a speed V 3 ；
When p=p 4 When the temperature in the corresponding incubator (1) rises at a speed V 4 ；
Wherein V is 1 ＞V 2 ＞V 3 ＞V 4 ；
The P is e 、P 1 、P 2 、P 3 、P 4 The difference between every two adjacent values satisfies the arithmetic relationship, namely:
P e -P 1 ＝P 1 -P 2 +Δ；
P 1 -P 2 ＝P 2 -P 3 +Δ；
P 2 -P 3 ＝P 3 -P 4 +Δ。
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