Temperature and humidity balance method and carbon dioxide incubator

Abstract

The temperature and humidity balance method provided by the embodiment of the present invention includes: controlling the rotation speed of the first fan so that the gas flows into the channel from at least one inlet, flows along the water tank, the condensation area and at least one side wall, and flows out from at least one outlet; heating the water tank; heating the three side walls respectively; heating the door. The embodiment of the present invention performs different heating controls on the door, the three side walls and the water tank at the bottom according to the characteristics of each surface inside the carbon dioxide incubator. After the water tank is heated, the water vapor enters the channel and flows through the condensation area and then flows through at least one side wall for heating, and then flows out from at least one outlet of the channel to adjust the temperature and humidity of the inner cavity. The humidity is first adjusted through the condensation area, and then the temperature is adjusted by flowing through at least one side wall, thereby better balancing the temperature and humidity inside the box.

Description

Technical Field

[0001] The invention relates to the field of carbon dioxide incubators, and in particular to a temperature and humidity balancing method and a carbon dioxide incubator. Background Art

[0002] A CO2 incubator is a device that cultures cells in vitro by simulating the growth environment of cells in a living organism. Cell culture experiments have extremely high requirements for the environment inside the incubator, such as cleanliness, temperature accuracy and stability, humidity accuracy and stability, gas concentration stability, etc. A CO2 incubator with high cleanliness, high precision and high stability is crucial to experimental data and results.

[0003] The existing technology usually uses a multi-channel proportional integral differential (PID) algorithm to control the heating power of the heating wires on each surface of the box to adjust the temperature in the box and solve the problem of condensation; and uses the evaporation of water in the water tray to adjust the humidity in the box. However, when the temperature and humidity are adjusted independently, it may be difficult to keep both of them stably at their respective target values, that is, it is difficult to balance the temperature and humidity. Summary of the invention

[0004] The temperature and humidity balancing method provided in the embodiment of the present invention aims to solve the problem in the prior art that it is difficult to balance the temperature and humidity in a box.

[0005] In a first aspect, a temperature and humidity balance method is provided, which is applied to a carbon dioxide incubator, wherein the carbon dioxide incubator comprises: a door, a top plate, three side walls and a water tank, wherein the door, the top plate, the three side walls and the water tank enclose an inner cavity, and the water tank is arranged at the bottom of the inner cavity; It also includes a channel and a first fan disposed in the channel, wherein the channel includes at least one inlet distributed above the water tank and at least one outlet disposed on at least one side wall and / or the top plate; A condensation zone is formed along the passageway between the water tank and at least one side wall; The method comprises: Controlling the speed of the first fan so that the gas flows into the channel from at least one inlet, flows along the water tank, the condensation area and at least one side wall, and flows out from at least one outlet; Heating the water tank, if the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a first preset value, adjusting the heating power according to a parabolic change law; if it is less than the first preset value, adjusting the heating power according to a first PID algorithm set; Heat the three side walls respectively. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the second preset value, the first fixed value is used as the heating power. If it is less than the second preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set. Heating the box door, if the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the third preset value, the second fixed value is used as the heating power; if it is less than the third preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the third PID algorithm set.

[0006] In a second aspect, a carbon dioxide incubator is provided, comprising: a box door, a top plate, three side walls and a water tank, wherein the box door, the top plate, the three side walls and the water tank enclose an inner cavity, and the water tank is arranged at the bottom of the inner cavity; It also includes a channel and a first fan disposed in the channel, wherein the channel includes at least one inlet distributed above the water tank and at least one outlet disposed on at least one side wall and / or the top plate; A condensation zone is formed along the passageway between the water tank and at least one side wall; The carbon dioxide incubator also includes a controller and heating devices arranged on the door, three side walls and the water tank, and the controller includes a circulation unit, a water tank heating unit, a side wall heating unit and a door heating unit; a circulation unit, configured to control the rotation speed of the first fan so that the gas flows from at least one inlet into the channel, flows along the water tank, the condensation area and at least one side wall, and flows out from at least one outlet; A water tank heating unit, used for heating the water tank, if the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a first preset value, the heating power is adjusted according to a parabolic transformation law, if it is less than the first preset value, the heating power is adjusted according to a first PID algorithm set; A side wall heating unit is used to heat the three side walls respectively. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a second preset value, a first fixed value is used as the heating power. If it is less than the second preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set. The cabinet door heating unit is used to heat the cabinet door. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a third preset value, the second fixed value is used as the heating power. If it is less than the third preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the third PID algorithm set.

[0007] The embodiment of the present invention performs different heating controls on the door, three side walls and the water tank at the bottom according to the characteristics of each surface inside the carbon dioxide incubator. After the water tank is heated, water vapor enters the channel and passes through the condensation area and then flows through at least one side wall for heating, and then flows out from at least one outlet of the channel to adjust the temperature and humidity of the inner cavity. The humidity is first adjusted through the condensation area, and then the temperature is adjusted by flowing through at least one side wall, thereby better balancing the temperature and humidity inside the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a schematic diagram of a carbon dioxide incubator provided in Example 1 of the present invention; Figure 2 is a schematic diagram of the top of a water tank provided in Embodiment 1 of the present invention; Figure 3 is a flow chart of the temperature and humidity balance method provided in Example 1 of the present invention; Figure 4 is a flow chart of adjusting the heating power of the side wall when the heating power is less than the second preset value provided by the first embodiment of the present invention; Figure 5 is a flow chart of adjusting the heating power of the door when the heating power is less than the third preset value provided by the first embodiment of the present invention; Figure 6 is a schematic diagram of a box door provided in Embodiment 2 of the present invention; Figure 7 is a schematic diagram of an outer door provided in Embodiment 2 of the present invention; Figure 8 This is a structural block diagram of a carbon dioxide incubator controller provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0009] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar modules or modules with the same or similar functions. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0010] The embodiment of the present invention performs different heating controls on the door, three side walls and the water tank at the bottom according to the characteristics of each surface inside the carbon dioxide incubator. After the water tank is heated, water vapor enters the channel and passes through the condensation area and then flows through at least one side wall for heating, and then flows out from at least one outlet of the channel to adjust the temperature and humidity of the inner cavity. The humidity is first adjusted through the condensation area, and then the temperature is adjusted by flowing through at least one side wall, thereby better balancing the temperature and humidity inside the box. Embodiment 1

[0011] Figure 1 Schematic diagram of a carbon dioxide incubator provided in Embodiment 1 of the present invention. The carbon dioxide incubator comprises a door 1, a top plate 2, three side walls 3 and a water tank 4, and the six surfaces together constitute the body of the carbon dioxide incubator. The door 1, the top plate 2, the three side walls 3 and the water tank 4 enclose an inner cavity, and the water tank 4 is arranged at the bottom of the inner cavity. The carbon dioxide incubator also comprises a channel 5 and a first fan 6 arranged in the channel 5. The channel 5 comprises at least one inlet 51 distributed above the water tank 4 and at least one outlet 52 arranged on at least one side wall 3 and / or the top plate 2. Figure 2 : is a schematic diagram of the top of the water tank provided in the first embodiment of the present invention. A plurality of inlets 51 of different sizes and arranged in an array are arranged on the cover plate above the water tank 4, that is, on the top of the water tank 4. The outlet 52 can be arranged on one side wall 3 or on multiple side walls 3, or after the channel 5 extends along the side wall 3, the outlet 52 is arranged on the top plate 2. Preferably, the outlet 52 is arranged at a position of the top plate 2 close to the door 1, so that the gas flows out after being heated by the side wall 3 and the top plate 2, and the gas flowing out from the outlet 52 affects the temperature and humidity of the inner cavity from the door 1 inward and from top to bottom, thereby improving the uniformity. The outlet 52 can also be arranged on the side wall 3 and the top plate 2 at the same time. A plurality of horizontal shelves are arranged in the area outside the channel 5 in the inner cavity for placing biological samples for cell culture experiments. A plurality of through holes arranged in an array are arranged on each horizontal shelf (not shown in the figure) to facilitate gas flow. Along the channel 5, a condensation area 7 is formed between the water tank 4 and at least one side wall 3.

[0012] Figure 3 : is a flow chart of the temperature and humidity balance method provided in Example 1 of the present invention. Figure 3 As shown, the method includes: Step S301 : controlling the rotation speed of the first fan 6 so that the gas flows into the channel 5 from at least one inlet 51 , flows along the water tank 4 , the condensation area 7 and at least one side wall 3 , and flows out from at least one outlet 52 .

[0013] In the embodiment of the present invention, the first fan 6 is turned on to allow the gas to enter the channel 5 from the inlet 51. Figure 1The gas flows along the water tank 4, the condensation zone 7 and the side wall 3 in the direction of the arrow, and flows out from the outlet 52 after passing through the side wall 3 or through the side wall 3 and the top plate 2. When the gas passes through the condensation zone 7, part of the water vapor therein is cooled and converted into condensed water, and then flows back to the water tank 4 from the condensation zone 7, and does not flow out from the outlet 52 through the side wall 3, thereby adjusting the humidity of the gas flowing in the channel 5. Preferably, the carbon dioxide incubator also includes a second fan (not shown in the figure) arranged in the condensation zone 7 or connected to the condensation zone 7, and the second fan is used to adjust the temperature of the condensation zone 7. When it is necessary to maintain the current inner cavity temperature but reduce the humidity, the temperature of the condensation zone 7 is reduced, and when the gas passes through the condensation zone 7, more water vapor is converted into condensed water, and the remaining gas flows out from the outlet 52 after being reheated through the side wall 3 or through the side wall 3 and the top plate 2. The gas flowing out of the outlet 52 flows along the door 1, flows from the door 1 to the horizontal shelves, and flows from the upper horizontal shelf to the lower horizontal shelf, and finally enters the water tank 4 again from the inlet 51, thereby forming a gas circulation in the inner cavity. The rotation speed of the first fan 6 is controlled to change the speed of gas circulation to adjust the temperature and humidity of the inner cavity.

[0014] Step S302: heating the water tank 4. If the difference between the target inner cavity temperature and the current inner cavity temperature is greater than a first preset value, the heating power is adjusted according to a parabolic variation rule. If the difference is less than the first preset value, the heating power is adjusted according to a first PID algorithm set.

[0015] In the embodiment of the present invention, heating the water tank 4 can accelerate the evaporation of water in the water tank 4 and increase the temperature of the water vapor, and then adjust the temperature of the inner cavity through the gas circulation in the inner cavity. A temperature sensor (not shown in the figure) is set in the inner cavity to detect the current inner cavity temperature.

[0016] If the difference between the target value of the inner cavity temperature and the current inner cavity temperature is greater than the first preset value, that is, the current inner cavity temperature is much lower than the target value of the inner cavity temperature, the heating power of the water tank 4 is adjusted according to the parabolic change law, and the heating power P=a*t*t+b*t, where P represents the heating power, t represents the heating time, a and b are heating coefficients, a is less than 0, b is greater than 0, and the absolute value of b is much greater than the absolute value of a. According to the parabolic formula, the heating power can be quickly increased, but due to the large specific heat of water, in order to avoid overshoot, the heating power shows a downward trend after passing the vertex of the parabola.

[0017] If the difference between the target value of the inner cavity temperature and the current inner cavity temperature is less than the first preset value, that is, the current inner cavity temperature is less than the target value of the inner cavity temperature or is equal to or higher than the target value of the inner cavity temperature, the corresponding PID algorithm is selected from the first PID algorithm set to adjust the heating power according to the working mode of the carbon dioxide incubator. The first PID algorithm set includes multiple groups of PID algorithm coefficients, such as (6, 8, 2), (2, 7, 9), etc., where the first number is the proportional term coefficient, the second number is the integral term coefficient, and the third number is the differential term coefficient. The formula of the PID algorithm adopts the existing technology and is not repeated here. A group of coefficients is selected to substitute into the formula of the PID algorithm to adjust the heating power. The humidity required by the carbon dioxide incubator can be divided into multiple gears, such as normal humidity mode and low humidity mode. The door 1 can be a whole or composed of multiple small doors. The humidity gear and the door 1 are combined to form the working mode of the carbon dioxide incubator. For example, four working modes are formed as described above, and each working mode corresponds to a group of PID algorithm coefficients, so the first PID algorithm set includes four groups of coefficients. When the current inner cavity temperature is lower than the inner cavity temperature target value or is equal to or higher than the inner cavity temperature target value, the heating power of the water tank 4 is no longer adjusted according to the parabolic change law. Instead, a more stable PID algorithm is adopted. According to the working mode of the carbon dioxide incubator, a group of coefficients corresponding to the working mode are selected from the first PID algorithm set and substituted into the PID algorithm formula to adjust the heating power of the water tank 4.

[0018] Step S303: Heat the three side walls 3 separately. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the second preset value, the first fixed value is used as the heating power. If it is less than the second preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set.

[0019] In the embodiment of the present invention, the three side walls 3 are heated to adjust the temperature of the inner cavity.

[0020] If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the second preset value, that is, the current inner cavity temperature is much lower than the inner cavity temperature target value, the first fixed value is used as the heating power of the three side walls 3 .

[0021] If the difference between the inner cavity temperature target value and the current inner cavity temperature is less than the second preset value, that is, the current inner cavity temperature is lower than the inner cavity temperature target value or is equal to or higher than the inner cavity temperature target value, the heating power of the three side walls 3 is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set.

[0022] As an embodiment of the present invention, the process of adjusting the heating power of the side wall 3 when the heating power is less than the second preset value is as follows: Figure 4 As shown, the method includes: Step S401: heat the three side walls 3 respectively, and if the temperature is less than the second preset value, calculate the difference between the target value of the inner cavity temperature and the second preset value.

[0023] Step S402: Divide the temperature range greater than the difference between the inner cavity temperature target value and the second preset value into a first preset number of temperature intervals.

[0024] Step S403: selecting a corresponding PID algorithm from the second PID algorithm set according to the target value of the inner cavity temperature and the temperature interval in which the current inner cavity temperature is located to adjust the heating power.

[0025] In the embodiment of the present invention, the three side walls 3 are heated respectively. If the difference between the target value of the inner cavity temperature and the current inner cavity temperature is less than the second preset value, the difference between the target value of the inner cavity temperature and the second preset value is calculated, and the temperature range greater than the difference is divided into multiple temperature intervals, that is, the temperature interval in which the current inner cavity temperature is less than the target value of the inner cavity temperature (less than the second preset value) or equal to or higher than the target value of the inner cavity temperature is calculated, and it is divided into a first preset number of temperature intervals, such as 3 temperature intervals, the first temperature interval, the second temperature interval and the third temperature interval. The optional range of the target value of the inner cavity temperature is also divided into target value gears, such as less than 33 degrees Celsius is the first gear, 33 degrees Celsius to 37 degrees Celsius is the second gear, 37 degrees Celsius to 43 degrees Celsius is the third gear, and greater than 43 degrees Celsius is the fourth gear. Then, according to the temperature interval in which the current inner cavity temperature is located and the target value gear in which the target value of the inner cavity temperature is located, a set of coefficients is selected from the second PID algorithm set to adjust the heating power. If the current inner cavity temperature is in the first temperature range and the inner cavity temperature target value is in the first gear, select a corresponding set of PID algorithm coefficients; if the current inner cavity temperature is in the first temperature range and the inner cavity temperature target value is in the second gear, select another corresponding set of PID algorithm coefficients. The second PID algorithm set contains multiple sets of PID algorithm coefficients, and its principle is similar to that of the first PID algorithm set, which will not be repeated here.

[0026] When the current inner cavity temperature is lower than the inner cavity temperature target value or is equal to or higher than the inner cavity temperature target value, the first fixed value is no longer used as the heating power. Instead, the PID algorithm is used to adjust the heating power of the side wall 3 so that the temperature of the inner cavity converges to the inner cavity temperature target value.

[0027] Step S304: Heating the box door 1. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the third preset value, the second fixed value is used as the heating power. If it is less than the third preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the third PID algorithm set.

[0028] In an embodiment of the present invention, the door 1 is heated to adjust the temperature of the inner cavity. The heating logic of the door 1 is similar to the heating logic of the side wall 3. However, since the door 1 needs to be opened and closed frequently, or is exposed to relatively cold air outside the CO2 incubator, condensation is prone to occur on the side of the door 1 facing the inner cavity. Therefore, the parameters used in the heating process of the door 1 are different from those used for the side wall 3, such as the second fixed value and the third preset value, to avoid condensation as much as possible.

[0029] As an embodiment of the present invention, the process of adjusting the heating power of the door 1 when the heating power is less than the third preset value is as follows: Figure 5 As shown, the method includes: Step S501: Heating the oven door 1, if the temperature is less than the third preset value, calculating the difference between the target value of the inner cavity temperature and the third preset value.

[0030] Step S502: Divide the temperature range greater than the difference between the inner cavity temperature target value and the third preset value into a second preset number of temperature intervals.

[0031] Step S503: selecting a corresponding PID algorithm from the third PID algorithm set according to the target value of the inner cavity temperature and the temperature interval in which the current inner cavity temperature is located to adjust the heating power.

[0032] In the embodiment of the present invention, the coefficients of the multiple groups of PID algorithms included in the third PID algorithm set are different from those in the second PID algorithm set.

[0033] In an embodiment of the present invention, the heating power of the water tank 4, the side wall 3 and the door 1 is adjusted, including PID algorithm control and non-PID algorithm control. When the current cavity temperature is lower than the cavity temperature target value by a large amount, the non-PID algorithm control is adopted, which is conducive to quickly approaching the cavity temperature target value; when the current cavity temperature is lower than the cavity temperature target value by a small amount or is equal to or higher than the cavity temperature target value, the PID algorithm control is adopted, which is conducive to control accuracy and stability. In addition, the water tank 4, the side wall 3 and the door 1 each have their own characteristics in terms of the influence on the temperature and humidity of the cavity. Preferably, the first preset value is less than the second preset value and is also less than the third preset value. Compared with the door 1 and the side wall 3, it is easier to enter the non-PID algorithm control of the water tank 4 to adjust its heating power. This is because the gas flowing along the water tank 4 needs to pass through the adjustment of the condensation zone 7, the side wall 3 and the top plate 2 to affect the biological sample placed at the horizontal shelf. The temperature control of the water tank 4 can be simpler to reduce the computational complexity, while the temperature control of the door 1 and the side wall 3 needs to be more refined.

[0034] The embodiment of the present invention performs different heating controls on the door, three side walls and the water tank at the bottom according to the characteristics of each surface inside the carbon dioxide incubator. After the water tank is heated, water vapor enters the channel and passes through the condensation area and then flows through at least one side wall for heating, and then flows out from at least one outlet of the channel to adjust the temperature and humidity of the inner cavity. The humidity is first adjusted through the condensation area, and then the temperature is adjusted by flowing through at least one side wall, thereby better balancing the temperature and humidity inside the box. Embodiment 2

[0035] In the embodiment of the present invention, the basic structure of the carbon dioxide incubator is the same as that of the first embodiment, and the same components as the first embodiment use the same reference numerals as the first embodiment, including all the features described in the first embodiment, which will not be repeated here.

[0036] In the embodiment of the present invention, the carbon dioxide incubator further includes a controller (not shown in the figure) and a heating device (not shown in the figure) provided on the door 1, the three side walls 3 and the water tank 4. The heating device can be a heating wire, a heating copper tube, etc. Specifically, the heating wires are evenly distributed and attached to the outer sides of the three side walls 3 and the water tank 4, and the heating wires are connected to the controller, and the heating power thereof is controlled by the controller.

[0037] Figure 6 It is a schematic diagram of a box door provided in the second embodiment of the present invention. Figure 7 It is a schematic diagram of the outer door provided in the second embodiment of the present invention. The box door 1 is set as a transparent inner door, and the outer door is set on the outer side of the box door 1. The inner door and the outer door are both hinged on one of the side walls 3, and pivot relative to the side wall 3 to facilitate the taking and placing of biological samples. When only the outer door is opened and the inner door is not opened, the biological sample can be observed through the inner door. Furthermore, in addition to being a whole, the inner door can also be set as two or three small doors arranged in the vertical direction to facilitate the taking and placing of biological samples in a local area and reduce the impact on biological samples in other areas. The heating wires are evenly distributed on the outer door and connected to the controller. When the outer door is closed, the heating wires are in contact with the inner door, and the heating power is controlled by the controller.

[0038] Figure 8 The structural block diagram of the carbon dioxide incubator controller provided in the second embodiment of the present invention is as follows: Figure 8 As shown, the controller includes a circulation unit 81, a water tank heating unit 82, a side wall heating unit 83 and a tank door heating unit 84.

[0039] The circulation unit 81 is used to control the rotation speed of the first fan 6 so that the gas flows into the channel 5 from the at least one inlet 51 , flows along the water tank 4 , the condensation area 7 and the at least one side wall 3 , and flows out from the at least one outlet 52 .

[0040] The water tank heating unit 82 is used to heat the water tank 4. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the first preset value, the heating power is adjusted according to the parabolic transformation law. If it is less than the first preset value, the heating power is adjusted according to the first PID algorithm set.

[0041] The side wall heating unit 83 is used to heat the three side walls 3 respectively. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the second preset value, the first fixed value is used as the heating power. If it is less than the second preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set.

[0042] The cabinet door heating unit 84 is used to heat the cabinet door 1. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the third preset value, the second fixed value is used as the heating power. If it is less than the third preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the third PID algorithm set.

[0043] Preferably, the water tank heating unit 82 includes a water tank selection subunit.

[0044] The water tank selection subunit is used to select a corresponding PID algorithm from the first PID algorithm set to adjust the heating power according to the working mode of the carbon dioxide incubator if the water tank is less than a first preset value.

[0045] Preferably, the sidewall heating unit 83 includes a sidewall calculation subunit, a sidewall division subunit and a sidewall selection subunit.

[0046] The side wall calculation subunit is used to calculate the difference between the inner cavity temperature target value and the second preset value if it is less than the second preset value.

[0047] The side wall dividing subunit is used to divide the temperature range greater than the difference between the inner cavity temperature target value and the second preset value into a first preset number of temperature intervals.

[0048] The side wall selection subunit is used to select a corresponding PID algorithm from the second PID algorithm set to adjust the heating power according to the target value of the inner cavity temperature and the temperature interval in which the current inner cavity temperature is located.

[0049] Preferably, the door heating unit 84 includes a door calculation subunit, a door division subunit and a door selection subunit.

[0050] The door calculation subunit is used to calculate the difference between the inner cavity temperature target value and the third preset value if it is less than the third preset value.

[0051] The door dividing subunit is used to divide the temperature range greater than the difference between the inner cavity temperature target value and the third preset value into a second preset number of temperature intervals.

[0052] The door selection subunit is used to select a corresponding PID algorithm from the third PID algorithm set to adjust the heating power according to the target value of the inner cavity temperature and the temperature interval in which the current inner cavity temperature is located.

[0053] Preferably, the carbon dioxide incubator further comprises a second fan, and the second fan is used to adjust the temperature of the condensation zone 7 .

[0054] The embodiment of the present invention performs different heating controls on the door, three side walls and the water tank at the bottom according to the characteristics of each surface inside the carbon dioxide incubator. After the water tank is heated, water vapor enters the channel and passes through the condensation area and then flows through at least one side wall for heating, and then flows out from at least one outlet of the channel to adjust the temperature and humidity of the inner cavity. The humidity is first adjusted through the condensation area, and then the temperature is adjusted by flowing through at least one side wall, thereby better balancing the temperature and humidity inside the box.

[0055] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A temperature and humidity balance method, characterized in that: Applicable to a carbon dioxide incubator, the carbon dioxide incubator comprising: a door, a top plate, three side walls and a water tank, the door, the top plate, the three side walls and the water tank enclose an inner cavity, and the water tank is arranged at the bottom of the inner cavity; Also includes a channel and a first fan disposed in the channel, wherein the channel includes at least one inlet distributed above the water tank and at least one outlet disposed on at least one side wall and / or the top plate; A condensation zone is formed along the passage between the water tank and at least one side wall; The method comprises: Controlling the rotation speed of the first fan so that the gas flows from the at least one inlet into the channel, flows along the water tank, the condensation area and at least one side wall, and flows out from the at least one outlet; Heating the water tank, if the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a first preset value, adjusting the heating power according to a parabolic variation law, if it is less than the first preset value, adjusting the heating power according to a first PID algorithm set; Heat the three side walls respectively, and if the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than the second preset value, use the first fixed value as the heating power; if it is less than the second preset value, adjust the heating power according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set; Heat the box door. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a third preset value, use the second fixed value as the heating power. If it is less than the third preset value, adjust the heating power according to the current inner cavity temperature, the inner cavity temperature target value and the third PID algorithm set.

2. The method according to claim 1, characterized in that: Heating the water tank, if the water pressure is less than the first preset value, adjusting the heating power according to the first PID algorithm set includes: The water tank is heated, and if the water value is less than the first preset value, a corresponding PID algorithm is selected from a first PID algorithm set according to the working mode of the carbon dioxide incubator to adjust the heating power.

3. The method according to claim 1, characterized in that The three side walls are heated respectively, and if the temperature is less than the second preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set, including: Heat the three side walls respectively, and if the temperature is less than the second preset value, calculate the difference between the inner cavity temperature target value and the second preset value; Dividing a temperature range greater than the difference between the inner cavity temperature target value and the second preset value into a first preset number of temperature intervals; A corresponding PID algorithm is selected from the second PID algorithm set according to the inner cavity temperature target value and the temperature interval in which the current inner cavity temperature is located to adjust the heating power.

4. The method according to claim 1, characterized in that Heating the door, if the temperature is less than the third preset value, adjusting the heating power according to the current inner cavity temperature, the inner cavity temperature target value and the third PID algorithm set includes: Heating the door, and if the temperature is less than the third preset value, calculating the difference between the target value of the inner cavity temperature and the third preset value; Dividing a temperature range greater than the difference between the inner cavity temperature target value and the third preset value into a second preset number of temperature intervals; A corresponding PID algorithm is selected from the third PID algorithm set according to the target value of the inner cavity temperature and the temperature interval in which the current inner cavity temperature is located to adjust the heating power.

5. The method according to any one of claims 1 to 4, characterized in that: The carbon dioxide incubator further includes a second fan, and the second fan is used to adjust the temperature of the condensation zone.

6. A carbon dioxide incubator, characterized in that: include: A box door, a top plate, three side walls and a water tank, wherein the box door, the top plate, the three side walls and the water tank enclose an inner cavity, and the water tank is arranged at the bottom of the inner cavity; Also includes a channel and a first fan disposed in the channel, wherein the channel includes at least one inlet distributed above the water tank and at least one outlet disposed on at least one side wall and / or the top plate; A condensation zone is formed along the passage between the water tank and at least one side wall; The carbon dioxide incubator also includes a controller and heating devices arranged on the door, three side walls and the water tank, wherein the controller includes a circulation unit, a water tank heating unit, a side wall heating unit and a door heating unit; a circulation unit, configured to control the rotation speed of the first fan so that the gas flows from the at least one inlet into the channel, flows along the water tank, the condensation area and at least one side wall, and flows out from the at least one outlet; a water tank heating unit, used for heating the water tank, and adjusting the heating power according to a parabolic transformation law if the difference between the target inner cavity temperature and the current inner cavity temperature is greater than a first preset value, and adjusting the heating power according to a first PID algorithm set if the difference between the target inner cavity temperature and the current inner cavity temperature is less than the first preset value; A side wall heating unit, used for heating the three side walls respectively, and if the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a second preset value, a first fixed value is used as the heating power; if it is less than the second preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the second PID algorithm set; The cabinet door heating unit is used to heat the cabinet door. If the difference between the inner cavity temperature target value and the current inner cavity temperature is greater than a third preset value, a second fixed value is used as the heating power. If it is less than the third preset value, the heating power is adjusted according to the current inner cavity temperature, the inner cavity temperature target value and the third PID algorithm set.

7. The carbon dioxide incubator according to claim 6, characterized in that: The tank heating unit consists of: The water tank selection subunit is used to select a corresponding PID algorithm from the first PID algorithm set to adjust the heating power according to the working mode of the carbon dioxide incubator if it is less than the first preset value.

8. The carbon dioxide incubator according to claim 6, characterized in that: The side wall heating unit consists of: A side wall calculation subunit, for calculating the difference between the inner cavity temperature target value and the second preset value if the inner cavity temperature is less than the second preset value; A side wall dividing subunit, used to divide a temperature range greater than the difference between the inner cavity temperature target value and the second preset value into a first preset number of temperature intervals; The side wall selection subunit is used to select a corresponding PID algorithm from the second PID algorithm set to adjust the heating power according to the target value of the inner cavity temperature and the temperature interval in which the current inner cavity temperature is located.

9. The carbon dioxide incubator according to claim 6, characterized in that: The door heating unit includes: The door calculation subunit is used to calculate the difference between the inner cavity temperature target value and the third preset value if it is less than the third preset value; The door dividing subunit is used to divide the temperature range greater than the difference between the inner cavity temperature target value and the third preset value into a second preset number of temperature intervals; The door selection subunit is used to select a corresponding PID algorithm from the third PID algorithm set to adjust the heating power according to the target value of the inner cavity temperature and the temperature interval in which the current inner cavity temperature is located.

10. The carbon dioxide incubator according to any one of claims 6 to 9, characterized in that: A second fan is also included, and the second fan is used to adjust the temperature of the condensation area.

Images