Variable temperature box with zero upper temperature and zero lower temperature adjusting functions

Abstract

The utility model provides a variable temperature box with a zero upper temperature and subzero temperature adjusting function, which relates to the technical field of variable temperature boxes and comprises a refrigeration module structural member, a Peltier refrigeration sheet, a heating module, a box body, a high-temperature temperature sensor, a temperature controller and a low-temperature temperature sensor. The refrigeration and heating functions are achieved through the Peltier refrigeration piece and the heating module, the temperature in the box is measured through the high-temperature sensor and the low-temperature sensor, and according to the measured temperature, the temperature controller controls the Peltier refrigeration piece to conduct refrigeration or the heating module to conduct heating. The variable temperature box can be adjusted within the temperature range of-50 DEG C to 900 DEG C, has the advantages of being continuous and variable in temperature and remarkable in refrigerating or heating effect, is low in manufacturing cost, facilitates later part replacement and maintenance, and solves the technical problems that in the prior art, a constant temperature box is limited in temperature control range, high in price and relatively high in maintenance cost.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature-changing boxes, and particularly relates to a temperature-changing box with the functions of adjusting positive and negative temperatures. Background Art

[0002] Traditional constant temperature boxes are one of the indispensable devices in laboratories, medical treatment and industrial production, and are used to provide a stable and precisely controlled temperature environment. However, these devices are often designed to work only within a specific temperature range, which limits their application scope; low-temperature constant temperature boxes usually adopt a refrigerant circulation system to achieve low-temperature control, such as using liquid nitrogen or compression refrigeration, etc., and are mainly applied in biological sample preservation, chemical reaction condition control, material performance testing, etc.; high-temperature constant temperature boxes mainly heat through electric heating elements and use fans for air circulation to keep the temperature uniform, and are mainly applied in material aging tests, heat treatment processes, drying and curing, etc. At present, most constant temperature boxes in the prior art can only work within a relatively narrow temperature range, which limits their applicability, resulting in a limited temperature control range. High-performance constant temperature boxes are often expensive, and at the same time, the complex structure and high-precision requirements make the maintenance cost of such devices relatively high. Content of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the defects in the prior art, so as to provide a temperature-changing box with the functions of adjusting positive and negative temperatures.

[0004] A temperature-changing box with the functions of adjusting positive and negative temperatures includes: a refrigeration module, a heating module and a box body. The refrigeration module and the heating module are oppositely arranged on the box body. The refrigeration module includes a refrigeration module structural member and a Peltier refrigeration sheet. The refrigeration module structural member is arranged on the box body, and the Peltier refrigeration sheet is arranged on the side of the refrigeration module structural member close to the inside of the box body. A control module is also arranged on the box body. The control module includes a high-temperature temperature sensor, a temperature controller and a low-temperature temperature sensor. The temperature controller is communicatively connected with the heating module, the Peltier refrigeration sheet, the high-temperature temperature sensor and the low-temperature temperature sensor.

[0005] Further, the refrigeration module further includes a cooling fan, and the cooling fan is arranged on the refrigeration module structural member.

[0006] Further, the heating module includes a heating element and a heating module structural member. The heating module structural member is arranged on the box body, and the heating element is arranged on the side of the heating module structural member close to the inside of the box body. The temperature controller is communicatively connected with the heating element.

[0007] Further, the heating element is a nickel-chromium alloy heating wire, and the nickel-chromium alloy heating wire is spirally arranged on the heating module structural member.

[0008] Furthermore, the control module further includes a control module structural member which is arranged on the box body, and the high-temperature temperature sensor, the temperature controller and the low-temperature temperature sensor are all installed on the control module structural member.

[0009] Furthermore, an experimental article inlet / outlet is formed on the box body, a sealing plate is installed on the experimental article inlet / outlet, and an observation window is also formed on the box body.

[0010] Furthermore, heat-conducting silicone grease is applied at the position corresponding to the cooling fan on the cooling module structural member. The cooling module structural member is made of brass material, and a plurality of mounting holes are formed in the cooling module structural member.

[0011] Furthermore, flexible graphite sealing rings are provided at the joints of the cooling module structural member and the box body, the heating module structural member and the box body, and the control module structural member and the box body.

[0012] Furthermore, the high-temperature temperature sensor is an S-type thermocouple, and the low-temperature temperature sensor is a PT temperature sensor.

[0013] Furthermore, the control module structural member is made of epoxy glass fiber, and the heating module structural member is made of alumina ceramic.

[0014] The technical solution of the present utility model has the following advantages:

[0015] 1. A temperature-changing box with the functions of adjusting temperatures above and below zero provided by the present utility model realizes the refrigeration and heating functions through the Peltier refrigeration sheet and the heating module, measures the temperature inside the box through the high-temperature temperature sensor and the low-temperature temperature sensor, and according to the measured temperature, the temperature controller controls the Peltier refrigeration sheet to refrigerate or the heating module to heat. The temperature-changing box can be adjusted within the temperature range of -50°C to 900°C, and has the characteristics of continuously variable temperature, remarkable refrigeration or heating effect, low manufacturing cost, and being convenient for later replacement of parts and maintenance.

[0016] 2. In the technical solution provided by the present utility model, the cooling fan on the cooling module structural member helps to improve air flow and heat exchange efficiency, and the heat-conducting silicone grease transfers the temperature heat inside the box to the fan and then to the outside, which helps to reduce the temperature inside the box. Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 Schematic diagram of the internal structure of the present utility model;

[0020] Figure 3 Schematic diagram of the refrigeration module structure of the present utility model;

[0021] Figure 4 Schematic diagram of the control module structure of the present utility model;

[0022] Figure 5 Schematic diagram of the heating module structure of the present utility model;

[0023] Figure 6 Schematic diagram of the sealing plate structure of the present utility model;

[0024] Figure 7 Schematic diagram of the box body structure of the present utility model;

[0025] Figure 8 Flow chart of the working principle of the present utility model.

[0026] Explanation of reference numerals:

[0027] 1 - Refrigeration module; 2 - Heating module; 3 - Control module; 4 - Sealing plate; 5 - Box body; 6 - Cooling fan; 7 - Refrigeration module structural member; 8 - Peltier refrigeration chip; 9 - High-temperature temperature sensor; 10 - Temperature controller; 11 - Low-temperature temperature sensor; 12 - Control module structural member; 13 - Heating element; 14 - Heating module structural member; 15 - Observation window. Specific embodiments

[0028] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] As Figures 1 to 8 shown, a temperature-changing box with the functions of regulating positive and negative temperatures includes: a refrigeration module 1, a heating module 2, and a box body 5. The refrigeration module 1 and the heating module 2 are relatively arranged on the box body 5. The refrigeration module 1 includes a refrigeration module structural member 7 and a Peltier refrigeration sheet 8. The refrigeration module structural member 7 is arranged on the box body 5, and the Peltier refrigeration sheet 8 is arranged on the side of the refrigeration module structural member 7 close to the inside of the box body 5. A control module 3 is also arranged on the box body 5. The control module 3 includes a high-temperature temperature sensor 9, a temperature controller 10, and a low-temperature temperature sensor 11. The temperature controller 10 is communicatively connected to the heating module 2, the Peltier refrigeration sheet 8, the high-temperature temperature sensor 9, and the low-temperature temperature sensor 11. The temperature measurement range of the high-temperature temperature sensor 9 is 0°C to 1300°C, and the temperature measurement range of the low-temperature temperature sensor 11 is -200°C to 180°C; the refrigeration module 1 is arranged on the top of the box body 5, and the heating module 2 is arranged on the bottom of the box body 5, which is beneficial to realizing the principle of natural convection, so that cold air can flow downward and hot air can flow upward, effectively covering the entire internal space of the box body.

[0033] The above-mentioned variable-temperature incubator with the functions of adjusting temperatures above and below zero realizes the refrigeration and heating functions through the Peltier cooler 8 and the heating module 2, measures the temperature inside the incubator through the high-temperature temperature sensor 9 and the low-temperature temperature sensor 11, and according to the measured temperature, the temperature controller 10 controls the Peltier cooler 8 to refrigerate or the heating module 2 to heat. The variable-temperature incubator can be adjusted within the temperature range of -50°C to 900°C, and has the characteristics of continuously variable temperature, significant refrigeration or heating effect, low manufacturing cost, and is convenient for later replacement of parts and maintenance.

[0034] As Figure 3 shown, in this embodiment, the refrigeration module 1 further includes a cooling fan 6, and the cooling fan 6 is arranged on the refrigeration module structural member 7; the cooling fan 6 is used to enhance air flow, improve the heat exchange efficiency, better remove the heat inside the incubator, and reduce the temperature.

[0035] As Figure 5 shown, in this embodiment, the heating module 2 includes a heating element 13 and a heating module structural member 14, the heating module structural member 14 is arranged on the box body 5, the heating element 13 is arranged on one side of the heating module structural member 14 close to the inside of the box body 5, and the temperature controller 10 is communicatively connected to the heating element 13; an installation groove corresponding to the heating module structural member 14 is opened on the box body 5, the heating module structural member 14 is installed in the groove, and a plurality of installation holes are opened on the heating module structural member 14, and the heating module structural member 14 is fixedly installed on the box body 5 by cooperating with the installation holes through nickel-based alloy screws and connecting with the box body 5.

[0036] As Figure 5 shown, in this embodiment, the heating element 13 is a nickel-chromium alloy heating wire, and the nickel-chromium alloy heating wire is arranged in a spiral shape on the heating module structural member 14; the nickel-chromium alloy heating wire has good oxidation resistance, high temperature resistance and a long service life, and the spiral arrangement will increase the contact area with the surrounding air or the object to be heated, improving the thermal efficiency.

[0037] As Figure 4As shown, in this embodiment, the control module 3 further includes a control module structural member 12. The control module structural member 12 is arranged on the box body 5. The high-temperature temperature sensor 9, the temperature controller 10, and the low-temperature temperature sensor 11 are all installed on the control module structural member 12. The control module 3 is arranged on the side of the box body 5. An installation groove corresponding to the control module structural member 12 is opened on the box body 5. The control module structural member 12 is installed in the groove. Moreover, a plurality of installation holes are opened on the control module structural member 12. By cooperating the nickel-based alloy screws with the installation holes and connecting with the box body 5, the control module structural member 12 is fixedly installed on the box body 5. The high-temperature temperature sensor 9 and the low-temperature temperature sensor 11 are used to monitor the temperature. The temperature controller 10 controls the temperature inside the box body. Its specific working mode is that after the high-temperature temperature sensor 9 and the low-temperature temperature sensor 11 detect the temperature inside the box body, they transmit it to the temperature controller 10. The temperature controller 10 adjusts the temperature according to the set temperature mode. In the low-temperature mode, the output power of the Peltier cooler 8 is adjusted. In the high-temperature mode, the output power of the heating element 13 is adjusted. The temperature controller 10 controls the heating element 13 to generate heat and the Peltier cooler 8 to refrigerate, ensuring that the device can accurately reach and maintain the temperature point set by the user.

[0038] As Figure 6 and Figure 7As shown in the figure, in this embodiment, an experimental article inlet / outlet is provided on the box body 5, and a sealing plate 4 is installed on the experimental article inlet / outlet. An observation window 15 is also provided on the box body 5. The experimental article inlet / outlet facilitates the placement of the experimental article into or removal from the temperature-changing box. The sealing plate 4 seals the experimental article inlet / outlet to ensure the normal operation of the temperature-changing box. Through the observation window 15, it is convenient to observe the situation inside the box. The sealing plate 4 is composed of a high-temperature resistant and heat-insulating mica plate and a 310 stainless steel plate, and the 310 stainless steel plate is located on the outer layer of the sealing plate 4, while the high-temperature resistant and heat-insulating mica plate is located on the inner layer of the sealing plate 4. In order to ensure good sealing inside the box when the sealing plate 4 is closed and prevent the internal temperature from being affected, a high-temperature resistant graphite sealing ring is installed on one side of the high-temperature resistant and heat-insulating mica plate of the sealing plate 4. The seal between the sealing plate 4 and the box body 5 uses the high-temperature resistant graphite sealing ring, which can maintain good sealing performance even at extreme temperatures, avoiding the influence of external air on the uniformity and stability of the internal temperature of the box. Multiple mounting holes are provided on the box body 5 to facilitate the installation of the refrigeration module structural member 7, the heating module structural member 14, and the control module structural member 12. The observation window 15 is made of silica high-temperature resistant glass, which can monitor the experimental process inside the box without affecting the internal temperature. The composition structure of the box body 5 from the inside to the outside is successively a high-temperature resistant and heat-insulating mica plate, a silicon aluminum ceramic fiber, an insulating phenolic board, and a 310 stainless steel plate. The high-temperature resistant and heat-insulating mica plate can effectively reflect heat, reduce heat radiation loss, and can also provide support as a structural member. The silicon aluminum ceramic fiber has strong heat insulation performance and can further reduce heat conduction. The insulating phenolic board can further enhance the heat insulation effect and at the same time play an electrical insulation role. The 310 stainless steel plate has strong high-temperature resistance and can also resist corrosion, ensuring the structural integrity of the box body at extreme temperatures.

[0039] As Figure 3 shown, in this embodiment, thermal conductive silicone grease is applied at the position of the refrigeration module structural member 7 corresponding to the cooling fan 6. The refrigeration module structural member 7 is made of brass material, and multiple mounting holes are provided on the refrigeration module structural member 7. The thermal conductive silicone grease transfers the temperature heat inside the box to the fan and then to the outside, which helps to reduce the internal temperature of the box. The brass material has good thermal conductivity and mechanical strength. An installation groove corresponding to the refrigeration module structural member 7 is provided on the box body 5. The refrigeration module structural member 7 is installed in the groove and is connected to the box body 5 by cooperating with the multiple mounting holes on the refrigeration module structural member 7 through nickel-based alloy screws, fixing the refrigeration module structural member 7 on the box body 5.

[0040] As Figure 2 shown, in this embodiment, a flexible graphite sealing ring is provided at the connection between the refrigeration module structural member 7 and the box body 5, a flexible graphite sealing ring is provided at the connection between the heating module structural member 14 and the box body 5, and a flexible graphite sealing ring is provided at the connection between the control module structural member 12 and the box body 5. The flexible graphite sealing ring has good heat resistance and strong sealing performance.

[0041] As Figure 4 shown, in this embodiment, the high-temperature temperature sensor 9 is an S-type thermocouple, and the low-temperature temperature sensor 11 is a PT temperature sensor; corundum is provided outside the high-temperature temperature sensor 9, and the corundum plays a protective role for the high-temperature temperature sensor 9. The low-temperature temperature sensor 11 uses a special PT temperature sensor for liquid nitrogen, which helps to realize the detection when the temperature-changing box is at a low temperature.

[0042] As Figure 4 and Figure 5 shown, in this embodiment, the control module structural member 12 is made of epoxy fiberglass, and the heating module structural member 14 is made of alumina ceramic; epoxy fiberglass is resistant to high temperature, has strong insulation and good mechanical properties. Alumina ceramic is a high-temperature resistant material, which does not deform under high temperature and also has good insulation properties.

[0043] As Figures 1 to 8 shown, in this embodiment, first, different types of temperature sensors are selected for operation according to different high-temperature or low-temperature environments to be detected. The low-temperature temperature sensor 11 is used in the low-temperature mode, and the high-temperature temperature sensor 9 is selected in the high-temperature mode. The temperature sensor transmits the temperature signal to the temperature controller 10. The temperature controller 10 receives the signal and feeds back relevant information to the upper computer. Subsequently, the temperature controller 10 adjusts the heating element 13 in the heating module 2 and the Peltier cooler 8 in the refrigeration module 1 according to the signal from the upper computer. In the high-temperature mode, when the temperature does not reach the set value, the heating power of the heating element 13 is increased and the Peltier cooler 8 is turned off. When the temperature exceeds the set value, the heating power of the heating element 13 is reduced and the Peltier cooler 8 is started. In the low-temperature mode, when the temperature is lower than the set value, the refrigeration power of the Peltier cooler 8 is increased and the heating element 13 is turned off. When the temperature exceeds the set value, the refrigeration power of the Peltier cooler 8 is reduced and the heating element 13 is turned on. Through the dynamic cooperation of the heating element 13 and the Peltier cooler 8, the required temperature set value can be reached faster. It should be noted that the upper computer can not only output a constant temperature set value, but also provide a temperature change curve that changes with time, so as to realize a more refined temperature control strategy.

[0044] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the creative utility model.

Claims

1. A temperature-variable box with the function of regulating above-zero temperature and below-zero temperature, comprising: A refrigeration module (1), a heating module (2) and a housing (5), characterized in that the refrigeration module (1) and the heating module (2) are arranged on the housing (5) relative to each other, the refrigeration module (1) comprises a refrigeration module structure (7) and a Peltier refrigeration plate (8), the refrigeration module structure (7) is arranged on the housing (5), the Peltier refrigeration plate (8) is arranged on a side of the refrigeration module structure (7) close to the inside of the housing (5), and a control module (3) is also arranged on the housing (5), the control module (3) comprises a high temperature sensor (9), a temperature controller (10) and a low temperature sensor (11), and the temperature controller (10) is communicatively connected with the heating module (2), the Peltier refrigeration plate (8), the high temperature sensor (9) and the low temperature sensor (11).

2. A temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 1, characterized in that: The refrigeration module (1) further comprises a heat dissipation fan (6), and the heat dissipation fan (6) is arranged on the refrigeration module structural component (7).

3. A temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 1, characterized in that: The heating module (2) comprises a heating element (13) and a heating module structural component (14); the heating module structural component (14) is arranged on a housing (5); the heating element (13) is arranged on a side of the heating module structural component (14) close to the interior of the housing (5); and the temperature controller (10) is communicatively connected with the heating element (13).

4. A temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 3, characterized in that: The heating element (13) is a nickel-chromium alloy heating wire, which is arranged in a spiral shape on the heating module structural component (14).

5. The temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 3, characterized in that: The control module (3) further comprises a control module structural component (12), the control module structural component (12) being arranged on the box body (5), and the high temperature sensor (9), the temperature controller (10) and the low temperature sensor (11) being all mounted on the control module structural component (12).

6. The temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 1, characterized in that: The box body (5) is provided with an experimental product inlet and outlet, a sealing plate (4) is installed on the experimental product inlet and outlet, and an observation window (15) is also provided on the box body (5).

7. The temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 2, characterized in that: The position of the refrigeration module structural component (7) corresponding to the heat dissipation fan (6) is coated with thermal conductive silicone grease, the refrigeration module structural component (7) is made of brass material, and a plurality of mounting holes are provided on the refrigeration module structural component (7).

8. The temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 5, characterized in that: A flexible graphite sealing ring is provided at the connection between the refrigeration module structural component (7) and the box body (5), a flexible graphite sealing ring is provided at the connection between the heating module structural component (14) and the box body (5), and a flexible graphite sealing ring is provided at the connection between the control module structural component (12) and the box body (5).

9. The temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 1, characterized in that: The high temperature sensor (9) is an S-type thermocouple, and the low temperature sensor (11) is a PT temperature sensor.

10. The temperature-variable box with the function of regulating above-zero temperature and below-zero temperature according to claim 5, characterized in that: The control module structural component (12) is made of epoxy glass fiber, and the heating module structural component (14) is made of alumina ceramics.

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