Evaporator and control method thereof

Abstract

The application discloses an evaporator and a control method thereof, and relates to the technical field of refrigeration. The evaporator comprises an evaporator body, gas-liquid separation parts, a pipeline storage part and a controller. The bottom of the evaporator body is connected with a plurality of gas-liquid separation parts. The gas-liquid separation parts are connected with each other through the pipeline storage part. Each gas-liquid separation part is provided with a gravity sensor. The gravity sensor is connected with the controller. The controller controls the on-off between the evaporator body and the gas-liquid separation part according to the gravity of the liquid refrigerant at the bottom of the evaporator body detected by the gravity sensor, so as to control the volume of the liquid refrigerant entering the pipeline storage part. The application judges the condition of the liquid refrigerant in the evaporator body by using the gravity sensor. The opening and closing of the rotating electrode plate in the gas-liquid separation part are controlled by comparison with a threshold value. The liquid refrigerant is stored in the pipeline storage part, and the heat exchange efficiency of the evaporator body is improved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to an evaporator and its control method. Background Technology

[0002] Refrigerant plays a crucial role in refrigeration systems. Different states of refrigerant exchange heat with the external environment, allowing the freezer to properly freeze food. The compressor produces high-temperature, high-pressure gaseous refrigerant. After being cooled by the condenser, the refrigerant flows through a capillary tube for throttling and pressure reduction. Ideally, the refrigerant would evaporate entirely into a gas in the evaporator. However, normally, the refrigerant exists in both liquid and gaseous states in the evaporator. If a large amount of liquid refrigerant accumulates at the bottom of the evaporator, it will affect the evaporator's heat exchange performance, resulting in incomplete evaporation and low refrigeration efficiency. Especially in systems with two or more mixed refrigerants, since each refrigerant has a different boiling point, if too much of one type of refrigerant remains in the evaporator, it will significantly impact system performance. Summary of the Invention

[0003] To address the problem that the liquid refrigerant in the evaporator cannot fully evaporate and tends to accumulate at the bottom of the evaporator, resulting in low refrigeration efficiency, this invention provides an evaporator and its control method.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An evaporator includes an evaporator body, a gas-liquid separation section, a pipe storage section, and a controller. The bottom of the evaporator body is connected to a plurality of the gas-liquid separation sections, and adjacent gas-liquid separation sections are connected to each other through the pipe storage section. Each gas-liquid separation section is equipped with a gravity sensor, and the gravity sensor is connected to the controller. The controller controls the connection and disconnection between the evaporator body and the gas-liquid separation section based on the gravity of the liquid refrigerant detected by the gravity sensor at the bottom of the evaporator body, thereby controlling the volume of liquid refrigerant entering the pipe storage section.

[0006] Furthermore, each of the bottom sides of the evaporator body is connected to a gas-liquid separation section, and the top of each gas-liquid separation section has a through hole, which communicates with the evaporator body.

[0007] Furthermore, the gas-liquid separation unit includes a rotating shaft, a fixed electrode plate, and a rotating electrode plate that can be adapted to the through hole. One end of the rotating electrode plate is connected to the rotating shaft, and the other end blocks the through hole. The two fixed electrode plates are fixed to the inner wall of the gas-liquid separation unit and are located on both sides of the rotating electrode plate.

[0008] Furthermore, the gravity sensor is disposed on the top of the gas-liquid separation section and adjacent to the through hole.

[0009] Furthermore, a liquid level sensor is installed inside the pipeline storage section, and the liquid level sensor is connected to the controller.

[0010] A method for controlling an evaporator, applied to a freezer equipped with an evaporator as described in any of the above descriptions, wherein the controller is connected to a compressor in a refrigeration system, and the specific steps include:

[0011] S1: The controller is pre-set with a target threshold x, a liquid level threshold h, and a time threshold t. The controller compares the gravity value G detected by the gravity sensor with the target threshold x. If the gravity value G ≥ the target threshold x, the rotating electrode plate rotates by an angle Фa to open the through hole, allowing liquid refrigerant to enter the pipeline storage section through the through hole, and then proceeds to S2. If the gravity value G < the target threshold x, the rotating electrode plate rotates by an angle Фb to completely close the through hole, and then proceeds to S2.

[0012] S2: The controller detects the liquid level H in the pipe storage section based on the liquid level sensor and determines whether the liquid level H ≤ liquid level threshold h. If it does not meet the requirement, the compressor speed is reduced. If it does meet the requirement, the system operates normally and enters S3.

[0013] S3: The controller determines whether the running time T is greater than or equal to the time threshold t based on the compressor's running time T. If not, it continues to run and makes a judgment. If it is, the controller controls the compressor to stop running, and the rotating electrode plate rotates by an angle Фb to close all the through holes and enters S1.

[0014] Furthermore, the controller controls the size of the rotation angle Фa based on the gravity value G detected by the gravity sensor.

[0015] The beneficial effects of this invention are as follows: This invention utilizes a gravity sensor to determine the gravity of the liquid refrigerant in the evaporator body and compares it with a pre-set threshold. Based on different results, it controls the opening and closing of the rotating electrode plate in the gas-liquid separation section to store the liquid refrigerant in the pipeline storage section, thereby improving the heat exchange efficiency of the evaporator body. This invention also controls the compressor speed by detecting the liquid level using a liquid level sensor in the pipeline storage section, preventing the generation of excessive liquid refrigerant. Furthermore, it compares the compressor's running time with a time threshold to control the compressor's operating time, further improving the evaporation efficiency of the evaporator body. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic representation of the structural principle of one embodiment of the present invention.

[0017] Figure 2 The diagram shows the structure of the gas-liquid separation unit.

[0018] Figure 3 The diagram shown is a flowchart of the evaporator control method. Detailed Implementation

[0019] This invention discloses an evaporator and its control method. The following describes one embodiment of the invention in detail with reference to the accompanying drawings.

[0020] like Figure 1 As shown, an evaporator includes an evaporator body 1, a gas-liquid separation section 2, a pipe storage section 3, and a controller. The bottom left and right sides of the evaporator body 1 are each connected to a gas-liquid separation section 2. The top of each gas-liquid separation section 2 has a through hole 6. The gas-liquid separation section 2 is connected to the evaporator body 1 through the through hole 6. The two gas-liquid separation sections 2 are connected to each other through the pipe storage section 3. A liquid level sensor 5 is installed in the pipe storage section 3 and is connected to the controller.

[0021] like Figure 2 As shown, each gas-liquid separation section 2 includes a gravity sensor 4, a rotating shaft 7, a fixed electrode plate 8, and a rotating electrode plate 9. The rotating electrode plate 9 is adapted to fit the through hole 6. One end of the rotating electrode plate 9 is connected to the rotating shaft 7 and can rotate around the rotating shaft 7, while the other end can open or close the through hole 6. The controller can control the rotation angle of the rotating electrode plate 9 through the fixed electrode plate 8. The fixed electrode plate 8 is fixed to the inner wall of the gas-liquid separation section 2 and located on both sides of the rotating motor. The gravity sensor 4 is set at the top of the gas-liquid separation section 2 and is close to the through hole 6. The controller is connected to both the gravity sensor 4 and the fixed electrode plate 8. The controller controls the opening and closing of the rotating electrode plate 9 based on the weight of the liquid refrigerant in the bottom of the evaporator body 1 monitored by the gravity sensor 4, thereby controlling the volume of liquid refrigerant entering the pipe storage section 3 from the through hole 6.

[0022] like Figure 3 As shown, a control method for an evaporator is applied to a freezer equipped with the aforementioned evaporator, wherein the controller is connected to the compressor in the refrigeration system.

[0023] In the first step, when the gas-liquid mixed refrigerant flows to the bottom of the evaporator body 1, the liquid refrigerant will sink due to gravity and enter the pipeline storage section 3 through the gas-liquid separation section 2 from the through hole 6. The controller is pre-set with a target threshold x, a liquid level threshold h, and a time threshold t. The controller detects the gravity value G of the liquid refrigerant through the gravity sensor 4 and compares the gravity value G with the target threshold x. If the gravity value G ≥ the target threshold x, the controller controls the rotation angle Фa of the rotating electrode plate 9 according to the gravity value G to open the through holes 6 of each gas-liquid separation section 2 to a certain extent. The liquid refrigerant can enter the pipeline storage section 3 through the through holes 6, and then proceed to the second step. If the gravity value G is large, Фa is large, which can increase the speed at which the liquid refrigerant enters the pipeline storage section 3 and improve the evaporator's cooling efficiency. If the gravity value G is large, Фa is small. If the gravity value G < the target threshold x, the rotating electrode plate 9 rotates by an angle Фb to completely close the through holes 6 of each gas-liquid separation section 2, and then proceed to the second step.

[0024] The second step is that the controller detects the liquid level H of the liquid refrigerant in the pipe storage section 3 by the liquid level sensor 5, and compares the liquid level H with the liquid level threshold h to determine whether the liquid level H ≤ liquid level threshold h. If it meets the condition, the system operates normally and proceeds to the third step; if it does not meet the condition, the compressor speed is reduced and the system is re-evaluated.

[0025] The third step involves the controller recording the compressor's running time T and comparing it with the time threshold t to determine if the running time T ≥ the time threshold t. If not, the compressor continues to run and the determination is repeated. If it does, the controller stops the compressor, rotates the electrode plate 9 by an angle Фb, completely closes the through hole 6, and re-enters the first step.

[0026] This invention utilizes a gravity sensor 4 to determine the state of the liquid refrigerant in the evaporator body 1 and compares it with a preset threshold. The controller then controls the opening and closing of the rotating electrode plate 9 in the gas-liquid separation section 2 based on the results, storing the liquid refrigerant in the pipe storage section 3 and improving the heat exchange efficiency of the evaporator body 1. Furthermore, this invention controls the compressor speed by detecting the liquid level using a level sensor 5 within the pipe storage section 3, preventing the generation of excessive liquid refrigerant. The compressor's operating time is also controlled by comparing it to a time threshold, further improving the evaporation efficiency of the evaporator body 1.

[0027] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An evaporator, characterized in that: The device includes an evaporator body (1), a gas-liquid separation section (2), a pipe storage section (3), and a controller. The bottom of the evaporator body (1) is connected to several gas-liquid separation sections (2), and adjacent gas-liquid separation sections (2) are connected to each other through the pipe storage section (3). Each gas-liquid separation section (2) is equipped with a gravity sensor (4), which is connected to the controller. The controller controls the connection and disconnection between the evaporator body (1) and the gas-liquid separation section (2) based on the gravity of the liquid refrigerant detected by the gravity sensor (4), thereby controlling the volume of liquid refrigerant entering the pipe storage section (3). Each of the gas-liquid separation sections (2) has a through hole (6) at its top, which is connected to the evaporator body (1) through the through hole (6); The gas-liquid separation section (2) includes a rotating shaft (7), a fixed electrode plate (8), and a rotating electrode plate (9) that can be adapted to the through hole (6). One end of the rotating electrode plate (9) is connected to the rotating shaft (7), and the other end blocks the through hole (6). The two fixed electrode plates (8) are fixed to the inner wall of the gas-liquid separation section (2) and located on both sides of the rotating electrode plate (9). A liquid level sensor (5) is installed inside the pipeline storage section (3), and the liquid level sensor (5) is connected to the controller.

2. An evaporator according to claim 1, characterized in that: The gas-liquid separation section (2) is connected to each of the bottom sides of the evaporator body (1).

3. An evaporator according to claim 2, characterized in that: The gravity sensor (4) is located on the top of the gas-liquid separation section (2) and adjacent to the through hole (6).

4. A method for controlling an evaporator, applied to a freezer equipped with an evaporator as described in any one of claims 1 to 3, characterized in that: The controller is connected to the compressor in the refrigeration system, and the specific steps include: S1: The controller is pre-set with a target threshold x, a liquid level threshold h, and a time threshold t. The controller compares the gravity value G detected by the gravity sensor (4) with the target threshold x. If the gravity value G ≥ the target threshold x, the rotating electrode plate (9) rotates by an angle Фa to open the through hole (6), and the liquid refrigerant can enter the pipeline storage section (3) from the through hole (6) and then enter S2; if the gravity value G < the target threshold x, the rotating electrode plate (9) rotates by an angle Фb to completely close the through hole (6) and then enters S2. S2: The controller detects the liquid level H in the pipe storage section (3) based on the liquid level sensor (5) and determines whether the liquid level H in the pipe is less than or equal to the liquid level threshold h. If not, the compressor speed is reduced. If it is, the compressor runs normally and enters S3. S3: The controller determines whether the running time T is greater than or equal to the time threshold t based on the compressor's running time T. If not, it continues to run and makes a judgment. If it is, the controller controls the compressor to stop running, and the rotating electrode plate (9) rotates by an angle Фb to close all the through holes (6) and enter S1.

5. The evaporator control method according to claim 4, characterized in that: The controller controls the rotation angle Фa based on the gravity value G detected by the gravity sensor (4).

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