Thermostatic bath capable of changing temperature according to certain speed

Abstract

The utility model relates to a thermostatic bath capable of changing temperature according to a certain speed. A slope temperature control meter, a 485 relay change-over switch and the like are arranged in a box body. The 485 relay change-over switch transmits a given value or the slope temperature control meter according to the set requirement of the operation screen, when slope temperature changing is needed, the temperature changing rate is set on the operation screen, for example, the current temperature is 30 DEG C, the temperature needs to be reduced to 0 DEG C, and the cooling rate is 0.5 DEG C / min, and after starting is clicked, the 485 relay change-over switch transmits a control signal to the slope temperature control meter to control heating. The slope temperature control meter controls the heater according to the set cooling rate and the cooling capacity of the refrigeration system of the equipment. And when the temperature is 0.1 DEG C away from the target temperature, the system automatically transfers a control signal to the constant value temperature control meter through the 485 relay module for automatic temperature control, so that the highly stable effect is achieved, and the equipment can be automatically stabilized at 0 DEG C. According to the utility model, two temperature control meters are combined, so that the detection efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a constant temperature oil bath for detection, in particular to a constant temperature bath with a variable temperature at a certain rate. Background Art

[0002] Most of the existing constant temperature baths in the market cannot control the variable temperature rate. For example, the patent number is: CN202120473299.8. When a certain temperature is set, the constant temperature bath will cool down or heat up at the fastest rate and reach the set point in the shortest time. However, it is not very friendly for detections that require slow temperature changes such as temperature switches. When approaching the temperature point to be detected, on the one hand, due to the relatively fast heating rate, generally 3℃ / min, when detecting the temperature switch, the heating rate is too fast, and the tester needs to concentrate highly. Sometimes, it is too late to record the temperature when the temperature switch disconnects, or it cannot be recorded, and it can only be cooled down naturally again and reheated. The tester cannot make an objective evaluation of the temperature switch to be detected; on the other hand, the speed is too slow, resulting in low detection efficiency. Summary of the Invention

[0003] In order to solve the above technical problems, the utility model provides a constant temperature bath with a variable temperature at a certain rate, and its technical solution is as follows:

[0004] It includes a box body. A touch screen is arranged on the surface of the box body. A horizontal partition is provided in the middle of the box body, dividing the box body into upper and lower parts. The upper box body is divided into a tank cabinet and a control cabinet by a vertical partition. A constant temperature bath is arranged in the tank cabinet. An oil tank, an oil pump and a cooling and refrigeration device are arranged in the lower box body. A solid state relay, a heater, a slope temperature controller, a 485 relay conversion switch, a fixed value temperature controller and a temperature sensor are arranged in the box body. The slope temperature controller, the 485 relay conversion switch and the fixed value temperature controller are installed on the horizontal partition. The heater is arranged in the inner tank of the constant temperature bath. The touch screen is communicatively connected with the 485 relay conversion switch. The 485 relay conversion switch is respectively connected with the fixed value temperature controller and the slope temperature controller. The slope temperature controller and the 485 relay conversion switch are respectively electrically connected with the power supply. The slope temperature controller and the fixed value temperature controller are respectively connected with the solid state relay. The solid state relay is connected with the heater.

[0005] Further, the output end of the touch screen is connected to the input end of the 485 relay conversion switch. The output end of the 485 relay conversion switch is respectively connected to the input end of the fixed value temperature controller and the input end of the slope temperature controller. The output end of the fixed value temperature controller and the output end of the slope temperature controller are respectively connected to the input end of the solid state relay. The output end of the solid state relay is connected to the input end of the heater.

[0006] The beneficial effects of the present utility model are as follows: The present utility model is a constant temperature bath with temperature change at a certain rate. Compared with the prior art, a slope temperature controller and a 485 relay switch are added inside the box. The 485 relay switch will transmit the set value or the slope temperature controller according to the setting requirements of the operation screen. The fixed value and the slope temperature controller are respectively connected to the solid state relay, and the solid state relay is connected to the heater. When slope temperature change is required, turn on the slope temperature change switch on the operation screen and set the temperature change rate. For example, if the current temperature is 30 °C and it is required to cool down to 0 °C with a cooling rate of 0.5 °C / min, after clicking start, the 485 relay switch will transmit the control signal to the slope temperature controller to control the heating. The slope temperature controller will control the heater according to the set cooling rate and the cooling capacity of the equipment refrigeration system itself. When there is still 0.1 °C away from the target temperature, the system automatically transfers the control signal to the fixed value temperature controller through the 485 relay module for automatic temperature control to achieve a highly stable effect, and the equipment will automatically stabilize at 0 °C. The present utility model combines two temperature controllers, greatly improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic structural diagram of the present utility model;

[0008] Figure 2 is Figure 1 side view;

[0009] Figure 3 is Figure 1 top view;

[0010] Figure 4 is a schematic circuit structure diagram of the present utility model;

[0011] As shown in the figure, 1 is the box body, 2 is the touch screen, 3 is the side cover, 4 is the button, 5 is the slope temperature controller, 6 is the stirring motor, 7 is the universal wheel, 8 is the constant temperature bath, 9 is the tank cover, 10 is the detection hole, 11 is the power supply, 12 is the 485 relay switch, 13 is the fixed value temperature controller, 14 is the partition board, 15 is the solid state relay, 16 is the refrigeration device, 17 is the circuit breaker. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] As shown in the figure, the utility model is a constant temperature bath that changes temperature at a certain rate, including a box body 1. Universal wheels 7 are provided at the bottom of the box body. A horizontal partition 14 is provided inside the box body, dividing the box body into an upper box body and a lower box body. The upper box body is divided into a tank cabinet and a control cabinet by a vertical partition. A constant temperature bath is provided in the tank cabinet; a solid state relay 15, a heater, a slope temperature controller 5, a 485 relay conversion switch 12, a fixed value temperature controller 13, and a temperature sensor are provided in the control cabinet. The slope temperature controller 5, the 485 relay conversion switch 12, and the fixed value temperature controller 13 are installed on the horizontal partition. The heater is arranged in the inner tank of the constant temperature bath. The touch screen 2 is communicatively connected to the 485 relay conversion switch 12. The 485 relay conversion switch 12 is respectively connected to the fixed value temperature controller 13 and the slope temperature controller 5. The slope temperature controller 5 and the 485 relay conversion switch 12 are respectively electrically connected to the power supply 11. The slope temperature controller 5 and the fixed value temperature controller 13 are respectively connected to the solid state relay 15. The solid state relay 15 is connected to the heater.

[0013] A solid state relay, a slope temperature controller, a 485 relay conversion switch, a power supply 11, a circuit breaker 17, a PLC controller, and a fixed value temperature controller are provided in the control cabinet; an oil tank, an oil pump, and a cooling device 16 are provided in the lower box body. An outlet is provided at the bottom of the constant temperature bath and is connected to the inlet of the oil tank through a pipeline. A control valve is provided on this pipeline; the inlet of the oil pump extends into the inner bottom of the oil tank through a pipeline, and a check valve is provided at the end of the inlet of this pipeline.

[0014] The PLC controller is respectively connected to the touch screen, the temperature controller, the AC contactor, the solid state relay, and the circuit breaker. The power supply is respectively electrically connected to the stirring motor, the touch screen, the PLC controller, the circuit breaker, the AC contactor, the solid state relay, the fixed value temperature controller, and the slope temperature controller. The output end of the touch screen is connected to the input end of the PLC controller. The output end of the PLC controller is respectively connected to the input ends of the fixed value temperature controller, the slope temperature controller, the circuit breaker, and the solid state relay. A side cover 3 is provided on the side of the box body 1, a touch screen 2 is provided on the front side, a switch button 4 is provided below the touch screen, a stirring motor 6 is provided on the top of the box body, a stirring shaft is installed on the stirring motor, the stirring shaft is arranged in the constant temperature bath 8, a tank cover 9 is provided on the top of the constant temperature bath, and a detection hole 10 is provided.

[0015] On the basis of the fixed value temperature controller 13, the temperature sensor (a temperature sensor is provided in the constant temperature bath), the heater, and the touch screen 2 of the original constant temperature bath (patent number: CN202120473299.8), a slope temperature controller 5 and a 485 relay conversion switch 12 are added. The 485 relay conversion switch 12 will transfer to the fixed value temperature controller 13 or the slope temperature controller 5 according to the setting requirements of the touch screen 2. The fixed value and slope temperature controllers are respectively connected to the solid state relay 15. The solid state relay is connected to the heater (arranged in the inner tank of the constant temperature bath).

[0016] When slope temperature change is required, turn on the slope temperature change switch on the operation screen and set the temperature change rate. For example, if the current temperature is 30°C and it is required to cool down to 0°C with a cooling rate of 0.5°C / min, after clicking "Start", the 485 relay changeover switch will transmit the control signal to the slope temperature controller to control heating. The slope temperature controller will control the heater according to the set cooling rate and the cooling capacity of the equipment's refrigeration device 16 itself. When there is still 0.1°C away from the target temperature, the system will automatically transfer the control signal to the fixed-value temperature controller through the 485 relay module for automatic temperature control to achieve a highly stable effect, and the equipment will automatically stabilize at 0°C.

[0017] Used in this embodiment:

[0018] The fixed-value temperature controller 13 is selected as: the self-developed kw01 temperature controller;

[0019] The slope temperature controller 5 is selected as: the self-developed kw02 temperature controller;

[0020] The refrigeration device 16 is: Embraco 2212 compressor, condenser, throttle capillary tube and evaporator;

[0021] The 485 relay changeover switch 12 is selected as: DAM0202 relay;

[0022] The solid-state relay 15 is selected as: Delixi CDG11DA40A;

[0023] The power supply 11 is selected as: 220V.

[0024] This utility model combines the advantages of two types of temperature controllers:

[0025] The slope temperature controller can control the heater according to the temperature change rate, but the fixed-value temperature control is not very ideal; the fixed-value temperature controller cannot change the temperature control rate, but the fixed-value temperature control is very stable. This utility model solves the technical problems in detecting temperature switches.

[0026] Further illustrate with actual examples:

[0027] For example, for the temperature switch of an electric kettle, the most important technical parameter is that it needs to automatically cut off the power supply when it detects that the temperature reaches 100°C. The detection technician can cover the starting point of temperature change with 100°C and perform fixed-value temperature increase. For example, the starting temperature is 90°C, the target temperature is 110°C, and the fixed-value temperature increase is carried out at 0.2°C / min. When passing through 100°C, observe the temperature value when the measured temperature switch disconnects to determine whether it is qualified or not. This utility model greatly improves the detection efficiency and well solves the pain points in temperature switch detection.

[0028] As described above, it is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model shall be covered within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A thermostatic bath that changes temperature at a certain rate, comprising a box, a touch screen arranged on the surface of the box, a transverse partition arranged in the middle of the box, dividing the box into an upper and lower part, the upper box is divided into a tank cabinet and a control cabinet by a longitudinal partition, a thermostatic bath is arranged in the tank cabinet, and an oil tank, an oil pump and a refrigeration cooling device are arranged in the lower box, characterized in that: A solid-state relay, a heater, a slope temperature control meter, a 485 relay conversion switch, a fixed-value temperature control meter and a temperature sensor are arranged in the box body. The slope temperature control meter, the 485 relay conversion switch and the fixed-value temperature control meter are installed on the transverse partition. The heater is arranged in the inner tank of the constant temperature tank. The touch screen is connected to the 485 relay conversion switch for communication. The 485 relay conversion switch is respectively connected to the fixed-value temperature control meter and the slope temperature control meter. The slope temperature control meter and the 485 relay conversion switch are respectively connected to the power supply. The slope temperature control meter and the fixed-value temperature control meter are respectively connected to the solid-state relay, and the solid-state relay is connected to the heater. The output end of the touch screen is connected to the input end of the 485 relay conversion switch, the output end of the 485 relay conversion switch is respectively connected to the input end of the fixed value temperature control meter and the input end of the slope temperature control meter, the output end of the fixed value temperature control meter and the output end of the slope temperature control meter are respectively connected to the input end of the solid-state relay, and the output end of the solid-state relay is connected to the input end of the heater.

Images