Air bath device for uniformly controlling temperature in turbidimetric microbiological measurement test

Abstract

The invention discloses an air bath device for uniformly controlling the temperature of a turbidimetric microbiological measurement test, the device is internally provided with a temperature control unit, and the temperature control unit is provided with a temperature sensor at an air outlet, so that a heater is regulated and controlled in real time, and the temperature of hot air output by the temperature control unit is controllable; the temperature control unit is further internally provided with an airflow racemization device and a two-dimensional grid, so that the flowing direction of hot air is stable, it is ensured that all positions of the upper heating area are evenly heated, the multiple culture dishes are evenly distributed in the heating area, and therefore the multiple culture dishes can be evenly and synchronously heated.

Description

Technical Field

[0001] The invention relates to an air bath device, in particular to an air bath device for uniformly controlling the temperature of a turbidimetric microbiological measurement test. Background Art

[0002] Turbidimetry, also known as turbidity determination, is a method for determining the concentration of suspended matter by measuring the intensity of light passing through a suspended particle medium. It is a light scattering measurement technology. It is widely used in the fields of food, cosmetics, and pharmaceuticals. In the process of microbial culture and measurement tests using turbidity, a large number of culture dishes need to be heated simultaneously. After heating to the culture temperature, turbidity measurements are performed along with the growth of microorganisms.

[0003] Each microorganism has three basic temperatures: the lowest growth temperature: no growth below this temperature; the optimum growth temperature: the fastest growth at this temperature; the highest growth temperature: no growth above this temperature. Moreover, microbial growth needs to go through different stages such as the resistance period, exponential period, stable period and decay period, and these stages are also directly related to temperature. Therefore, temperature is a very important factor affecting microbial growth, and the synchronous control of the heating process will also affect the growth rate of microorganisms in different culture dishes, thereby affecting the test results. Therefore, in the ideal microbial test heating process, all the culture dishes to be tested should be heated to the final culture temperature completely synchronously.

[0004] In order to heat the culture dish, there are three commonly used methods in the prior art:

[0005] Water bath method: The water bath method is a method of temperature control using water as a heat transfer medium. When using the water bath method to control the temperature of microbial culture, each culture dish is placed in water of controlled temperature. Due to the fluidity of water, it has good heat conductivity and can also better ensure the consistency of the heating rate of each culture dish. However, in the automatic turbidimetric microbial test, it is necessary to measure the turbidity of each culture dish while heating the culture, which is difficult to automate the test in turbid water. Taking it out of the water bath and measuring it again will cause interference with the turbidity due to the residual water on the outer surface of the culture dish.

[0006] Metal bath method: The metal bath method uses a temperature-controllable metal substrate as a heat-conducting medium, and the culture dish is placed in contact with the metal substrate to control the temperature rise of the culture dish. Since the thermal conductivity of metal is very high, the temperature of each part of the metal substrate can be kept very consistent, but due to the inconsistency of the contact surface between the culture dish and the metal substrate, the temperature rise rate of the culture dish may be different.

[0007] Air bath method: The air bath method uses flowing air as a heat transfer medium to control the temperature rise of the culture dish. In the air bath method, the culture dish is heated by forced convection. The air bath method is more suitable for instruments that conduct turbidity tests in batches and automation. The factors that affect heat flow in convective heat transfer mainly include: temperature and speed. In order to achieve a consistent heating rate for each culture dish, it is necessary to ensure that the temperature and speed of the air at each position are consistent, which is the difficulty in temperature control using the air bath method.

[0008] In the past, turbidimetric measuring instruments using the air bath method for heating did not pay enough attention to the uniformity of the heating rate during the heating process. The uneven heating rate will lead to inconsistent growth processes of microorganisms in different culture dishes, which will introduce systematic errors into the measurement.

[0009] Based on this, the inventor redesigned the turbidity measuring instrument of the air bath method in the hope of designing an air bath device that can heat up completely evenly and synchronously. Summary of the invention

[0010] In order to overcome the above problems, the inventors have conducted intensive research and designed a wind bath device for uniform temperature control of turbidimetric microbial measurement tests, wherein the device is provided with a temperature control unit, and the temperature control unit is provided with a temperature sensor at the air outlet, so as to adjust the heater in real time, so that the temperature of the hot air output by the temperature control unit is controllable, and an air flow derotator and a two-dimensional grid are also provided in the temperature control unit, so as to stabilize the flow direction of the hot air and ensure that each position of the upper heating zone is heated uniformly, and a plurality of culture dishes are evenly distributed in the heating zone, so that the plurality of culture dishes can be heated uniformly and synchronously, thereby completing the present invention.

[0011] Specifically, the object of the present invention is to provide an air bath device for uniform temperature control of a turbidimetric microbial measurement test, the device comprising a temperature control unit 001, a heating zone 002 is arranged above the temperature control unit 001, and a return air duct 003 is also arranged on the side of the temperature control unit 001 and the heating zone 002;

[0012] The temperature control unit 001 provides the heating zone 002 with evenly distributed hot air with controllable temperature and wind speed;

[0013] A plurality of culture dishes to be heated are evenly distributed in the heating zone 002;

[0014] The hot air from the heating area 002 is recovered and directed to the bottom of the temperature control unit 001 through the return air duct 003 .

[0015] The temperature control unit includes a fan 1, a heater 2, an airflow derotator 3, a two-dimensional grid 4 and a temperature sensor from bottom to top. When the temperature control unit is working, it can blow out heated gas with controllable wind speed and temperature.

[0016] The temperature sensor is connected to the heater 2 signal, and the air temperature output by the heater 2 is adjusted in real time according to the detection result of the temperature sensor.

[0017] Wherein, the airflow derotator 3 comprises derotation blades 31 and an upper baffle 32;

[0018] Preferably, the de-spinning blades are arranged obliquely, that is, the de-spinning blades form an inclination angle of 70 degrees with the horizontal direction.

[0019] The two-dimensional grid 4 includes an upper grid 41 and a lower grid 42.

[0020] The upper grid 41 is composed of a plurality of upper slats extending in the same direction.

[0021] The lower grid 42 is composed of a plurality of lower slats extending in the same direction;

[0022] The upper slats and the lower slats are arranged vertically.

[0023] There are 17 upper slats, which are numbered from upper slat 1 to upper slat 17 from left to right. When viewed from front to back,

[0024] Among them, the upper strip 1 has an angle of 55 degrees with the horizontal direction and is inclined to the left;

[0025] The second upper strip is at an angle of 65 degrees to the horizontal direction and is tilted to the left;

[0026] The upper strip three is at an angle of 70 degrees to the horizontal direction and is inclined to the left;

[0027] The upper strip four is at an angle of 80 degrees to the horizontal direction and is tilted to the left;

[0028] The angle between the upper strip 5 and the horizontal direction is 90 degrees;

[0029] The upper strip six has an angle of 60 degrees with the horizontal direction and is inclined to the right;

[0030] The upper strip seven is at an angle of 45 degrees to the horizontal direction and is inclined to the right;

[0031] The upper strip eight has an angle of 5 degrees with the horizontal direction and is inclined to the right;

[0032] The angle between the upper strip nine and the horizontal direction is 90 degrees;

[0033] Upper strips ten to seventeen are arranged symmetrically with upper strips one to eight with upper strips nine as the center.

[0034] There are 13 lower strips, which are numbered from lower strip one to lower strip thirteen from back to front, and when viewed from left to right,

[0035] Among them, the lower strip 1, lower strip 2, and lower strip 3 have an angle of 5 degrees with the horizontal direction and are inclined toward the rear side;

[0036] The lower strip 4 is at an angle of 70 degrees to the horizontal direction and is inclined toward the rear;

[0037] The lower strip five has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0038] The angle between the lower strip six and the horizontal direction is 82 degrees, and it is inclined toward the rear side;

[0039] The angle between the lower strip 7 and the horizontal direction is 90 degrees;

[0040] The lower strip eight has an angle of 82 degrees with the horizontal direction and is inclined to the front side;

[0041] The lower strip nine has an angle of 85 degrees with the horizontal direction and is inclined toward the rear side;

[0042] The angle between the lower strip and the horizontal direction is 90 degrees;

[0043] The lower strip 11 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0044] The lower strip 12 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0045] The lower strip thirteen has an angle of 70 degrees with the horizontal direction and is inclined toward the rear side.

[0046] The heating area 002 includes a culture dish support, on which a bayonet for placing and fixing the culture dish 5 is provided, and a channel for gas to pass through is also provided;

[0047] The bayonet holes are evenly arranged so that the culture dishes 5 are evenly distributed.

[0048] The culture dish 5 is in the shape of a long tube, and a boss protruding outward is arranged on the outside thereof;

[0049] The main body of the culture dish 5 can be inserted into the bayonet from top to bottom, and the boss is overlapped and fixed on the bayonet, so that the culture dish 5 is installed and fixed on the culture dish bracket.

[0050] The beneficial effects of the present invention include:

[0051] (1) According to the air bath device for uniform temperature control of turbidimetric microbial measurement test provided by the present invention, the wind speed and temperature of the hot air output by the heating control unit of the device are controllable, and after passing through the air flow de-rotation device, the heating temperature at each position in the heating zone can be ensured to be consistent, ensuring that all culture dishes can be heated synchronously and uniformly;

[0052] (2) The air bath device for uniform temperature control of turbidimetric microbial measurement tests provided by the present invention is provided with a return air duct, which can timely and effectively guide the hot air passing through the heating zone, ensure the balance of air pressure inside and outside the heating zone, avoid air pressure interference with the flow of hot air, and further ensure that the heating zone is heated evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 The overall structure schematic diagram of the air bath device for uniform temperature control of the turbidimetric microbiological measurement test of the present application is shown;

[0054] Figure 2 A schematic cross-sectional view of the structure of an air bath device for uniform temperature control in a turbidimetric microbiological measurement test according to the present invention is shown;

[0055] Figure 3 A schematic diagram showing the structure of the fan of the air bath device for uniform temperature control in the turbidimetric microbiological measurement test of the present application;

[0056] Figure 4 A schematic diagram showing the structure of the fan top of the air bath device for uniform temperature control in a turbidimetric microbiological measurement test of the present invention;

[0057] Figure 5 A schematic diagram showing the structure of an air flow derotator of an air bath device for uniform temperature control in a turbidimetric microbiological measurement test of the present invention;

[0058] Figure 6 A schematic diagram showing the structure of the upper grid of the air bath device for uniform temperature control in the turbidimetric microbiological measurement test of the present application;

[0059] Figure 7 A schematic diagram showing the structure of the lower grid of the air bath device for uniform temperature control in the turbidimetric microbiological measurement test of the present application is shown;

[0060] Figure 8 It shows that in the embodiment of the present application, the gas in the incubator (T box ), the highest temperature of the liquid in the culture dish (T max ) and the lowest temperature of the liquid in the culture dish (T min ) Schematic diagram of its change over time.

[0061] Description of Reference Numerals

[0062] 001-Heating control unit array

[0063] 002-Heating zone

[0064] 003-Return air duct

[0065] 1- Fan

[0066] 11-Corrugated board

[0067] 2- Heater

[0068] 3-Airflow derotator

[0069] 31-racemic leaves

[0070] 32-Upper baffle

[0071] 4-2D grid

[0072] 41-Upper grille

[0073] 42-Lower grille

[0074] 5-Petri dish DETAILED DESCRIPTION

[0075] The present invention will be further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present invention will become more clear and distinct.

[0076] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0077] The present invention provides a wind bath device for uniformly controlling the temperature of a turbidimetric microbiological measurement test, such as Figure 1 As shown in , the device includes a temperature control unit 001, a heating zone 002 is arranged above the temperature control unit 001, and a return air duct 003 is also arranged on the side of the temperature control unit 001 and the heating zone 002;

[0078] The temperature control unit 001 provides the heating zone 002 with evenly distributed hot air with controllable temperature and wind speed; the speed and temperature of the gas blown out by each heating control unit are consistent, so that when the gas generated by the temperature control unit passes through the heating zone, the speed and temperature parameters at each position are kept consistent, thereby achieving uniform and synchronous heating.

[0079] A plurality of culture dishes to be heated are evenly distributed in the heating zone 002;

[0080] The hot air in the heating area 002 is recovered and directed to the bottom of the temperature control unit 001 through the return air duct 003, so that the airflow near the culture dish is smooth, avoiding airflow turbulence caused by poor air circulation and thus uneven heating.

[0081] In a preferred embodiment, Figure 2 As shown in the figure, the heating control unit includes a fan 1, a heater 2, an airflow derotator 3, a two-dimensional grid 4 and a temperature sensor from bottom to top. When the heating control unit is working, it can blow out heating gas with controllable wind speed and temperature.

[0082] Preferably, the temperature sensor is connected to the heater 2 signal, and the working power of the heater 2 is adjusted in real time according to the detection result of the temperature sensor, thereby adjusting the temperature of the blown hot air;

[0083] In the present application, the fan 1 and the heater 2 are sealed and connected to ensure that the flowing air passing through the fan 1 enters the heater and flows out from the top of the heater. The heater 2 is provided with a plurality of evenly arranged heating blocks, and a basically consistent gap is left between each heating block. The temperature of each heating block rises and falls synchronously to further ensure that the temperature of the air passing through the heater 2 is uniform.

[0084] like Figure 3 and Figure 4 As shown in , the outer contour of the fan 1 is a square with a side length of 120 mm, and one side of the air outlet is connected to the heater. Multiple rows of wave-shaped corrugated plates 11 are arranged in the air outlet to preliminarily adjust the wind direction to ensure that the wind speed and wind direction at various locations can be evenly distributed.

[0085] The heating block in the heater is a PTC heater. Compared with a resistance wire heater, in addition to having a faster heating speed, its outstanding advantage in the present invention is uniform heating, thereby ensuring that the temperature of the air outlet is uniform.

[0086] In a preferred embodiment, Figure 5 As shown in

[0087] The airflow derotator 3 includes derotation blades 31 and an upper baffle 32; the derotation blades are 50 mm long and 20 mm high, with a total of 4 blades, and are evenly distributed on the upper baffle 32; preferably, the derotation blades are arranged obliquely, that is, the derotation blades are inclined at an angle of 70 degrees to the horizontal direction. The upper baffle 32 is circular with a diameter of 170 mm. The airflow derotator 3 provided in the present application can disperse the airflow to the surroundings, preventing most of the airflow from flowing directly upwards, resulting in too slow temperature rise around.

[0088] In a preferred embodiment, the two-dimensional grid 4 includes an upper grid 41 and a lower grid 42.

[0089] The upper grid 41 is composed of a plurality of upper slats extending in the same direction.

[0090] The lower grid 42 is composed of a plurality of lower slats extending in the same direction;

[0091] The upper slats and the lower slats are arranged vertically.

[0092] Furthermore, the upper slats are provided with 17 slats, which are numbered from left to right as upper slat 1 to upper slat 17. Figure 2 and Figure 6 As shown in

[0093] Among them, looking from front to back,

[0094] The upper strip 1 is at an angle of 55 degrees to the horizontal direction and is tilted to the left;

[0095] The second upper strip is at an angle of 65 degrees to the horizontal direction and is tilted to the left;

[0096] The upper strip three is at an angle of 70 degrees to the horizontal direction and is inclined to the left;

[0097] The upper strip four is at an angle of 80 degrees to the horizontal direction and is tilted to the left;

[0098] The angle between the upper strip 5 and the horizontal direction is 90 degrees;

[0099] The upper strip six has an angle of 60 degrees with the horizontal direction and is inclined to the right;

[0100] The upper strip seven is at an angle of 45 degrees to the horizontal direction and is inclined to the right;

[0101] The upper strip eight has an angle of 5 degrees with the horizontal direction and is inclined to the right;

[0102] The angle between the upper strip nine and the horizontal direction is 90 degrees;

[0103] Upper strips ten to seventeen are arranged symmetrically with upper strips one to eight with upper strips nine as the center.

[0104] Preferably, the lower strips are provided with 13 strips, which are numbered from the back to the front as lower strip one to lower strip thirteen. Figure 2 and Figure 7 As shown in

[0105] Among them, from left to right,

[0106] The angle between the lower strip 1, lower strip 2 and lower strip 3 and the horizontal direction is 5 degrees, and they are inclined toward the rear side;

[0107] The lower strip 4 is at an angle of 70 degrees to the horizontal direction and is inclined toward the rear;

[0108] The lower strip five has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0109] The angle between the lower strip six and the horizontal direction is 82 degrees, and it is inclined toward the rear side;

[0110] The angle between the lower strip 7 and the horizontal direction is 90 degrees;

[0111] The lower strip eight has an angle of 82 degrees with the horizontal direction and is inclined to the front side;

[0112] The lower strip nine has an angle of 85 degrees with the horizontal direction and is inclined toward the rear side;

[0113] The angle between the lower strip and the horizontal direction is 90 degrees;

[0114] The lower strip 11 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0115] The lower strip 12 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0116] The lower strip thirteen has an angle of 70 degrees with the horizontal direction and is inclined toward the rear side.

[0117] Wherein, the return air duct is located on the left side of the lower strip plate and is adjacent to the lower strip plate.

[0118] In this application, front, back, left, right, up, and down are as follows: Figure 2 as shown in .

[0119] Preferably, the length of the upper and lower strips is related to the internal space of the box, preferably, the width is 22 mm, the thickness is 2 mm; the gap between the upper grid 41 and the lower grid 42 is 5 mm;

[0120] The gas flow rate in the heater 2 is 1500 L / min;

[0121] The inventors have discovered that when the upper grid 41 and the lower grid 42 are set to the above-mentioned size and shape, they can just cooperate with the fan 1 and the airflow derotator 3, so that the gas overflowing upward from the two-dimensional grid 4 will basically continue to move vertically upward, and the temperature at each location in the heating zone 002 remains consistent, achieving the effect of uniform temperature control.

[0122] In a preferred embodiment, the heating zone 002 includes a culture dish holder, on which a bayonet for placing and fixing the culture dish 5 is provided, and a channel for gas to pass through is also provided;

[0123] The bayonet holes are evenly arranged so that the culture dishes 5 are evenly distributed.

[0124] The culture dish 5 is in the shape of a long tube, and a boss protruding outward is arranged on the outer side thereof;

[0125] The main body of the culture dish 5 can be inserted into the bayonet from top to bottom, and the boss is overlapped and fixed on the bayonet, so that the culture dish 5 is installed and fixed on the culture dish bracket.

[0126] In a preferred embodiment, Figure 1 As shown in the figure, a perforated plate with through holes is provided on the top of the heating zone, and the airflow in the heating zone is finally gathered to the upper part, enters the top cover through the perforated plate, and then flows into the return air duct. The lower part of the return air duct is connected with the negative pressure end of the fan, so the return air duct is in a low pressure state, realizing the overall circulation of the airflow.

[0127] Example

[0128] A heating zone that can accommodate 40 culture dishes, in which the culture dishes are arranged in 5 rows × 8 columns. Taking into account factors such as the mounting bracket and the gap between the culture dishes, the cross-sectional area of ​​the 40 culture dishes is approximately 250mm × 450mm.

[0129] A temperature control unit is arranged below the heating zone, and the temperature control unit includes a fan, a heater, an air flow derotator, and a temperature sensor. Figure 2 As shown in ; the temperature sensor is connected to the heater signal, and the working power of the heater is adjusted in real time according to the detection result of the temperature sensor.

[0130] A return air duct 003 is also provided on the side of the temperature control unit 001 and the heating area 002;

[0131] The temperature control unit 001 provides the heating zone 002 with evenly distributed hot air with controllable temperature and wind speed;

[0132] The hot air from the heating area 002 is recovered and directed to the bottom of the temperature control unit 001 through the return air duct 003 .

[0133] The airflow derotator 3 includes derotation blades 31 and an upper baffle 32;

[0134] The de-spinning blades are arranged obliquely, that is, the de-spinning blades are inclined at an angle of 70 degrees to the horizontal direction.

[0135] The two-dimensional grid 4 includes an upper grid 41 and a lower grid 42.

[0136] The upper grid 41 is composed of a plurality of upper slats extending in the same direction.

[0137] The lower grid 42 is composed of a plurality of lower slats extending in the same direction;

[0138] The upper slats and the lower slats are arranged vertically.

[0139] The upper slats are provided with 17 slats, which are numbered from left to right as upper slat 1 to upper slat 17.

[0140] Among them, looking from front to back,

[0141] The upper strip 1 is at an angle of 55 degrees to the horizontal direction and is tilted to the left;

[0142] The second upper strip is at an angle of 65 degrees to the horizontal direction and is tilted to the left;

[0143] The upper strip three is at an angle of 70 degrees to the horizontal direction and is tilted to the left;

[0144] The upper strip four is at an angle of 80 degrees to the horizontal direction and is tilted to the left;

[0145] The angle between the upper strip 5 and the horizontal direction is 90 degrees;

[0146] The upper strip six has an angle of 60 degrees with the horizontal direction and is inclined to the right;

[0147] The upper strip seven is at an angle of 45 degrees to the horizontal direction and is inclined to the right;

[0148] The upper strip eight has an angle of 5 degrees with the horizontal direction and is inclined to the right;

[0149] The angle between the upper strip nine and the horizontal direction is 90 degrees;

[0150] Upper strips 10 to 17 are arranged symmetrically with upper strips 1 to 8 as the center and upper strips 9 as the center;

[0151] The lower strips are provided with 13 strips, which are numbered from the back to the front as lower strip one to lower strip thirteen.

[0152] Among them, from left to right,

[0153] The angle between the lower strip 1, lower strip 2 and lower strip 3 and the horizontal direction is 5 degrees, and they are inclined toward the rear side;

[0154] The lower strip 4 is at an angle of 70 degrees to the horizontal direction and is inclined toward the rear;

[0155] The lower strip five has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0156] The angle between the lower strip six and the horizontal direction is 82 degrees, and it is inclined toward the rear side;

[0157] The angle between the lower strip 7 and the horizontal direction is 90 degrees;

[0158] The lower strip eight has an angle of 82 degrees with the horizontal direction and is inclined to the front side;

[0159] The lower strip nine has an angle of 85 degrees with the horizontal direction and is inclined toward the rear side;

[0160] The angle between the lower strip and the horizontal direction is 90 degrees;

[0161] The lower strip 11 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0162] The lower strip 12 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side;

[0163] The lower strip thirteen has an angle of 70 degrees with the horizontal direction and is inclined toward the rear side.

[0164] Through actual operation, it can be known that the 40 culture dishes in the above-mentioned heating zone can be heated evenly. In about 4000 seconds, the temperature is raised from 23.5 degrees to 37 degrees at an average rate of 0.2 degrees / min. The maximum temperature difference between any two culture dishes is controlled at 0.1 degrees. This shows that the distributed uniform heating air bath device for turbidimetric microbial measurement test provided in this application can effectively improve the uniformity of heating in each area in the heating zone.

[0165] Figure 8 The gas in the incubator (T box ), the highest temperature of the liquid in the culture dish (T max ) and the lowest temperature of the liquid in the culture dish (T min ) changes over time.

[0166] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. A wind bath device for uniform temperature control of turbidimetric microbiological measurement tests, characterized in that: The device comprises a temperature control unit (001), a heating zone (002) is arranged above the temperature control unit (001), and a return air duct (003) is also arranged on the sides of the temperature control unit (001) and the heating zone (002); The temperature control unit (001) provides the heating zone (002) with evenly distributed hot air with controllable temperature and wind speed; A plurality of culture dishes to be heated are evenly distributed in the heating zone (002); The hot air in the heating area (002) is recovered and directed to the bottom of the temperature control unit (001) through the return air duct (003).

2. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 1, characterized in that: The temperature control unit comprises, from bottom to top, a fan (1), a heater (2), an airflow derotator (3), a two-dimensional grid (4) and a temperature sensor. When the temperature control unit is in operation, it can blow out heated gas with controllable wind speed and temperature.

3. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 2, characterized in that: The temperature sensor is connected to the heater (2) signal, and the air temperature output by the heater (2) is adjusted in real time according to the detection result of the temperature sensor.

4. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 2, characterized in that: The airflow derotator (3) comprises derotation blades (31) and an upper baffle (32); Preferably, the de-spinning blades are arranged obliquely, that is, the de-spinning blades form an inclination angle of 70 degrees with the horizontal direction.

5. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 2, characterized in that: The two-dimensional grid (4) comprises an upper grid (41) and a lower grid (42), wherein the upper grid (41) is composed of a plurality of upper slats extending in the same direction. The lower grid (42) is composed of a plurality of lower slats extending in the same direction; The upper slats and the lower slats are arranged vertically.

6. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 5, characterized in that: The upper slats are provided with 17 slats, which are numbered from left to right as upper slat 1 to upper slat 17. Among them, looking from front to back, The upper strip 1 is at an angle of 55 degrees to the horizontal direction and is tilted to the left; The upper strip 2 is at an angle of 65 degrees to the horizontal direction and is tilted to the left; The upper strip three is at an angle of 70 degrees to the horizontal direction and is inclined to the left; The upper strip four is at an angle of 80 degrees to the horizontal direction and is tilted to the left; The angle between the upper strip 5 and the horizontal direction is 90 degrees; The upper strip six has an angle of 60 degrees with the horizontal direction and is inclined to the right; The upper strip seven is at an angle of 45 degrees to the horizontal direction and is inclined to the right; The upper strip eight has an angle of 5 degrees with the horizontal direction and is inclined to the right; The angle between the upper strip nine and the horizontal direction is 90 degrees; Upper strips ten to seventeen are arranged symmetrically with upper strips one to eight with upper strips nine as the center.

7. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 5, characterized in that: The lower strips are provided with 13 strips, which are numbered from the back to the front as lower strip one to lower strip thirteen. Among them, from left to right, The angle between the lower strip 1, lower strip 2 and lower strip 3 and the horizontal direction is 5 degrees, and they are inclined toward the rear side; The lower strip 4 is at an angle of 70 degrees to the horizontal direction and is inclined toward the rear; The lower strip five has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side; The angle between the lower strip six and the horizontal direction is 82 degrees, and it is inclined toward the rear side; The angle between the lower strip 7 and the horizontal direction is 90 degrees; The lower strip eight has an angle of 82 degrees with the horizontal direction and is inclined to the front side; The lower strip nine has an angle of 85 degrees with the horizontal direction and is inclined toward the rear side; The angle between the lower strip and the horizontal direction is 90 degrees; The lower strip 11 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side; The lower strip 12 has an angle of 75 degrees with the horizontal direction and is inclined toward the rear side; The lower strip thirteen has an angle of 70 degrees with the horizontal direction and is inclined toward the rear side.

8. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 1, characterized in that: The heating zone (002) comprises a culture dish support, on which a bayonet for placing and fixing the culture dish (5) is provided, and a channel for gas to pass through is also provided; The bayonet holes are evenly arranged, so that the culture dishes (5) are evenly distributed.

9. The air bath device for uniform temperature control of turbidimetric microbiological measurement test according to claim 5, characterized in that: The culture dish (5) is in the shape of a long tube, and a boss protruding outward is arranged on the outer side thereof; The main body of the culture dish (5) can be inserted into the bayonet from top to bottom, and the boss is overlapped and fixed on the bayonet, so that the culture dish (5) is installed and fixed on the culture dish support.

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