Automatic control system for cold charging working condition
By using an automatic control system in the refrigerant storage box, the temperature of the refrigerant is monitored in real time and the cooling equipment is controlled according to the set temperature difference threshold, the problem of difficulty in accurately determining the cooling end point in the prior art is solved, and precise control is achieved and efficient cooling.
Patent Information
- Application Number
- CN202420883314.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-04-26
AI Technical Summary
The existing refrigerated cooling box is difficult to accurately determine the end point of refrigeration, resulting in partial phase change or invalid refrigeration, and the cooling effect of refrigerant cannot be fully utilized.
An automatic control system for charging and cooling conditions is designed, and the refrigerant temperature is monitored in real time by inputting sensors and reflow sensors, and the working status of the charging and cooling equipment is automatically controlled according to the set temperature difference threshold, so as to accurately determine the charging and cooling end point.
The end point of charging and cooling is achieved accurately controlled, the cooling effect of the refrigerant is maximized, the cooling time is effectively grasped, and the cooling efficiency is improved.
Smart Images
Figure CN222319350U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cold-charging equipment, in particular to an automatic control system for cold-charging working conditions. Background Art
[0002] Before using the cold storage box, the cold storage ice plate in the box needs to be charged in advance, because the cold storage agent is sealed in the ice plate, and the cold storage agent in the ice plate gradually changes phase as the charging time increases, but the degree of phase change is difficult to accurately judge. If the charging time is short, the cold storage agent only partially changes phase, so the purpose of cold storage cannot be fully achieved. If the charging time is long, although the cold storage agent can change phase completely, part of the charging time may be invalid.
[0003] Currently, there are no mature cold storage box charging pile products on the market, or the charging end point can be roughly judged based on experience. However, due to different environmental conditions, the empirical judgment may have large errors and cannot give full play to the cold storage effect of the coolant. Utility Model Content
[0004] The utility model aims to solve the problems existing in the prior art and to provide an automatic control system for controlling the cold charging working condition based on the temperature difference of the cold charging refrigerant.
[0005] The purpose of the utility model is solved by the following technical solutions:
[0006] A cold charging working condition automatic control system, characterized in that: the control system includes a controller and an input sensor, a reflux sensor, a key circuit, a cold charging equipment control circuit, and a display screen which are respectively connected to the controller through lines, the input sensor is arranged at the outlet of the cold charging equipment refrigerant, or on the cold charging equipment refrigerant output pipe, or at the cold storage box refrigerant inlet, the reflux sensor is arranged at the outlet of the cold storage box refrigerant, or on the cold charging equipment refrigerant reflux pipe, or at the cold charging equipment refrigerant inlet, the input sensor and the reflux sensor can respectively collect temperature information of the monitoring point in real time; the controller controls the working state of the cold charging equipment through the cold charging equipment control circuit according to the temperature difference threshold set by the key circuit and the temperature difference of the temperature information collected in real time by the input sensor and the reflux sensor.
[0007] The key circuit is connected to the controller and is used to set the temperature difference threshold; the display screen is connected to the controller and is used to display the temperature difference threshold set by the key circuit, the temperature collected by the input sensor and the reflux sensor, and the actual temperature difference.
[0008] The controller is connected to the cold charging device via the cold charging device control circuit, so as to further control the working state of the cold charging device by controlling the cold charging device control circuit.
[0009] The controller adopts a microprocessor.
[0010] For the same model of cold charging equipment and the same model of cold storage box, when the input sensor is arranged at the refrigerant outlet of the cold charging equipment and the reflux sensor is arranged at the refrigerant inlet of the cold charging equipment, the temperature difference threshold set by the controller is the largest.
[0011] For the same type of cold charging equipment and the same type of cold storage box, when the input sensor is arranged at the coolant inlet of the cold storage box and the reflux sensor is arranged at the coolant outlet of the cold storage box, the temperature difference threshold set by the controller is the smallest.
[0012] The input sensor is arranged at the refrigerant outlet of the cold charging equipment and the reflux sensor is arranged at the refrigerant outlet of the cold storage box; the input sensor is arranged at the refrigerant outlet of the cold charging equipment and the reflux sensor is arranged on the refrigerant reflux pipe of the cold charging equipment; the input sensor is arranged at the refrigerant outlet of the cold charging equipment and the reflux sensor is arranged at the refrigerant inlet of the cold charging equipment.
[0013] The input sensor is arranged on the refrigerant output pipe of the cold charging equipment and the reflux sensor is arranged at the refrigerant outlet of the cold storage box; the input sensor is arranged on the refrigerant output pipe of the cold charging equipment and the reflux sensor is arranged on the refrigerant reflux pipe of the cold charging equipment; the input sensor is arranged on the refrigerant output pipe of the cold charging equipment and the reflux sensor is arranged at the refrigerant inlet of the cold charging equipment.
[0014] The input sensor is arranged at the refrigerant inlet of the cold storage box and the reflux sensor is arranged at the refrigerant outlet of the cold storage box; the input sensor is arranged at the refrigerant inlet of the cold storage box and the reflux sensor is arranged on the refrigerant reflux pipe of the cold charging equipment; the input sensor is arranged at the refrigerant inlet of the cold storage box and the reflux sensor is arranged at the refrigerant inlet of the cold charging equipment.
[0015] Compared with the prior art, the utility model has the following advantages:
[0016] The control system of the utility model monitors the refrigerant temperature on the cold charging inlet side through an input sensor and monitors the refrigerant temperature on the cold charging return side through a reflux sensor, compares the difference between the refrigerant temperature on the cold charging return side and the refrigerant temperature on the cold charging inlet side with a set temperature difference threshold and gives a judgment result, and automatically stops the cold charging operation when the temperature difference is not greater than the temperature difference threshold; the control system can accurately control the cold charging end point, freeze all the refrigerant, and maximize the cold storage effect of the refrigerant; at the same time, effectively grasp the cold charging time and improve the cold charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Attached Figure 1This is a control principle diagram of the automatic control system for cold charging conditions provided by the utility model.
[0018] Among them: 1—controller; 2—input sensor; 3—reflux sensor; 4—key circuit; 5—cooling equipment control circuit; 6—operation screen. DETAILED DESCRIPTION
[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0020] like Figure 1 As shown: an automatic control system for cold charging conditions, the control system includes a controller 1 and an input sensor 2, a reflux sensor 3, a key circuit 4, a cold charging equipment control circuit 5, and a display screen 6 respectively connected to the controller 1 through lines, the controller 1 adopts a microprocessor, such as STM32F103C8T6; the input sensor 2 and the reflux sensor 3 can respectively collect temperature information of the monitoring point in real time; the key circuit 4 is connected to the controller 1 for setting a temperature difference threshold; the display screen 6 is connected to the controller 1 for displaying the temperature difference threshold set by the key circuit 4, the temperature collected by the input sensor 2 and the reflux sensor 3 and the actual temperature difference; the controller 1 is connected to the cold charging equipment through the cold charging equipment control circuit 5 to further control the working state of the cold charging equipment by controlling the cold charging equipment control circuit 5. The input sensor 2 is arranged at the refrigerant outlet of the cold charging equipment, or on the refrigerant output pipe of the cold charging equipment, or at the refrigerant inlet of the cold storage box, and the reflux sensor 3 is arranged at the refrigerant outlet of the cold storage box, or on the refrigerant reflux pipe of the cold charging equipment, or at the refrigerant inlet of the cold charging equipment; when in use, the controller 1 controls the working state of the cold charging equipment through the cold charging equipment control circuit 5 according to the temperature difference threshold set by the key circuit 4 and the temperature difference of the temperature information collected in real time by the input sensor 2 and the reflux sensor 3, that is, the controller 1 determines the cold charging end point according to the temperature difference threshold and controls the working state of the cold charging equipment according to the judgment signal.
[0021] In practical applications, since the freezing time of the refrigerant is related to many factors such as the convective heat transfer coefficient on the refrigerant side, the thermal conductivity of the frozen layer, the characteristic size of the refrigerant, the type of refrigerant, and the temperature difference between the refrigerant and the refrigerant, the changes in many factors may lead to uncertainty in the cold charging time. However, as the cold charging proceeds, the frozen layer thickens and the heat transfer rate gradually decreases. Therefore, the refrigerant enters from the inlet and flows through the cold storage plate and then flows out from the outlet. The heat transfer decreases and the temperature difference gradually decreases. When it is as small as a certain value, it can be judged that the refrigerant is basically frozen. This temperature difference threshold is determined by experiments based on different types of cold storage plates before leaving the factory. For the same type of cold charging equipment and the same type of cold storage box, when the input sensor 2 is set at the outlet of the refrigerant of the cold charging equipment and the reflux sensor 3 is set at the inlet of the refrigerant of the cold charging equipment, the temperature difference threshold set by the controller 1 is the largest; when the input sensor 2 is set at the inlet of the refrigerant of the cold storage box and the reflux sensor 3 is set at the outlet of the refrigerant of the cold storage box, the temperature difference threshold set by the controller 1 is the smallest.
[0022] There are nine typical settings for the input sensor 2 and the return sensor 3: the first is that the input sensor 2 is set at the outlet of the refrigerant in the cold-charging device and the return sensor 3 is set at the outlet of the refrigerant in the cold-storage box; the second is that the input sensor 2 is set at the outlet of the refrigerant in the cold-charging device and the return sensor 3 is set on the return pipe of the refrigerant in the cold-charging device; the third is that the input sensor 2 is set at the outlet of the refrigerant in the cold-charging device and the return sensor 3 is set at the inlet of the refrigerant in the cold-charging device; the fourth is that the input sensor 2 is set on the outlet pipe of the refrigerant in the cold-charging device and the return sensor 3 is set at the outlet of the refrigerant in the cold-storage box; the fifth is that the input Sensor 2 is arranged on the refrigerant output pipe of the cold charging equipment and the reflux sensor 3 is arranged on the refrigerant return pipe of the cold charging equipment; the sixth type is that the input sensor 2 is arranged on the refrigerant output pipe of the cold charging equipment and the reflux sensor 3 is arranged at the refrigerant inlet of the cold charging equipment; the seventh type is that the input sensor 2 is arranged at the refrigerant inlet of the cold storage box and the reflux sensor 3 is arranged at the refrigerant outlet of the cold storage box; the eighth type is that the input sensor 2 is arranged at the refrigerant inlet of the cold storage box and the reflux sensor 3 is arranged on the refrigerant reflux pipe of the cold charging equipment; the ninth type is that the input sensor 2 is arranged at the refrigerant inlet of the cold storage box and the reflux sensor 3 is arranged at the refrigerant inlet of the cold charging equipment.
[0023] The process of cold charging is that the low-temperature refrigerant exchanges heat with the refrigerant through the heat exchanger plate. The low-temperature refrigerant reaches the refrigerant inlet of the cold storage box from the refrigerant outlet of the cold charging equipment through the refrigerant output pipe of the cold charging equipment. After entering the heat exchanger plate of the cold storage box, it quickly exchanges heat with the refrigerant in the cold storage box. When the refrigerant flows through the heat exchanger plate and flows out from the refrigerant outlet of the cold storage box, the temperature has risen. Therefore, at the beginning of cold charging, the temperature of the refrigerant return side is higher than the temperature of the inlet side and there is a relatively large temperature difference; as the heat exchange continues, this temperature difference gradually decreases. Based on this principle, the control system provided by the utility model is developed. When the controller 1 detects that the above temperature difference is less than a certain temperature difference threshold, it automatically shuts down, ends the cold charging, and realizes automatic identification of the cold charging end point.
[0024] The control system of the utility model monitors the refrigerant temperature on the cold charging inlet side through the input sensor 2 and the refrigerant temperature on the cold charging return side through the reflux sensor 3, compares the difference between the refrigerant temperature on the cold charging return side and the refrigerant temperature on the cold charging inlet side with the set temperature difference threshold and gives a judgment result, and automatically stops the cold charging operation when the temperature difference is not greater than the temperature difference threshold; the control system can accurately control the cold charging end point, freeze all the refrigerant, and maximize the cold storage effect of the refrigerant; at the same time, effectively grasp the cold charging time and improve the cold charging efficiency.
[0025] The above embodiments are only for illustrating the technical idea of the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the utility model; any technology not involved in the utility model can be realized by existing technology.
Claims
1. An automatic control system for cold charging conditions, characterized in that: The control system comprises a controller (1), and an input sensor (2), a reflux sensor (3), a key circuit (4), a cold charging device control circuit (5), and a display screen (6) respectively connected to the controller (1) via lines. The input sensor (2) is arranged at a refrigerant outlet of the cold charging device, or on a refrigerant outlet pipe of the cold charging device, or at a refrigerant inlet of a cold storage box. The reflux sensor (3) is arranged at a refrigerant outlet of the cold storage box, or on a refrigerant reflux pipe of the cold charging device, or at a refrigerant inlet of the cold charging device. The input sensor (2) and the reflux sensor (3) can respectively collect temperature information of a monitoring point in real time. The controller (1) controls the working state of the cold charging device through the cold charging device control circuit (5) according to a temperature difference threshold value set by the key circuit (4) and a temperature difference between temperature information collected in real time by the input sensor (2) and the reflux sensor (3).
2. The automatic control system for cold charging conditions according to claim 1 is characterized in that: The key circuit (4) is connected to the controller (1) and is used to set a temperature difference threshold; the display screen (6) is connected to the controller (1) and is used to display the temperature difference threshold set by the key circuit (4), the temperature collected by the input sensor (2) and the return sensor (3), and the actual temperature difference.
3. The automatic control system for cold charging conditions according to claim 1 is characterized in that: The controller (1) is connected to the cold charging device via the cold charging device control circuit (5) so as to further control the working state of the cold charging device by controlling the cold charging device control circuit (5).
4. The automatic control system for cold charging conditions according to claim 1 is characterized in that: The controller (1) adopts a microprocessor.
5. The automatic control system for cold charging conditions according to claim 1 is characterized in that: For the same type of cold charging equipment and the same type of cold storage box, when the input sensor (2) is arranged at the outlet of the refrigerant of the cold charging equipment and the return sensor (3) is arranged at the inlet of the refrigerant of the cold charging equipment, the temperature difference threshold value set by the controller (1) is the largest.
6. The automatic control system for cold charging conditions according to claim 1 is characterized in that: For the same type of cold charging equipment and the same type of cold storage box, when the input sensor (2) is arranged at the coolant inlet of the cold storage box and the return sensor (3) is arranged at the coolant outlet of the cold storage box, the temperature difference threshold value set by the controller (1) is the smallest.
7. The automatic control system for cold charging conditions according to any one of claims 1 to 6, characterized in that: The input sensor (2) is arranged at the outlet of the refrigerant of the cold charging device and the return sensor (3) is arranged at the outlet of the refrigerant of the cold storage box; the input sensor (2) is arranged at the outlet of the refrigerant of the cold charging device and the return sensor (3) is arranged on the refrigerant return pipe of the cold charging device; the input sensor (2) is arranged at the outlet of the refrigerant of the cold charging device and the return sensor (3) is arranged at the inlet of the refrigerant of the cold charging device.
8. The automatic control system for cold charging conditions according to any one of claims 1 to 6, characterized in that: The input sensor (2) is arranged on the refrigerant output pipe of the cold charging device and the reflux sensor (3) is arranged at the refrigerant outlet of the cold storage box; the input sensor (2) is arranged on the refrigerant output pipe of the cold charging device and the reflux sensor (3) is arranged on the refrigerant reflux pipe of the cold charging device; the input sensor (2) is arranged on the refrigerant output pipe of the cold charging device and the reflux sensor (3) is arranged at the refrigerant inlet of the cold charging device.
9. The automatic control system for cold charging conditions according to any one of claims 1 to 6, characterized in that: The input sensor (2) is arranged at the refrigerant inlet of the cold storage box and the return sensor (3) is arranged at the refrigerant outlet of the cold storage box; the input sensor (2) is arranged at the refrigerant inlet of the cold storage box and the return sensor (3) is arranged on the refrigerant return pipe of the cold charging device; the input sensor (2) is arranged at the refrigerant inlet of the cold storage box and the return sensor (3) is arranged at the refrigerant inlet of the cold charging device.