Refrigerant compressor PLC control cabinet cooling system

Abstract

The utility model belongs to the technical field of compression equipment, and discloses a refrigerant compressor PLC control cabinet cooling system. The system comprises a cabinet body and a cooling structure, the cooling structure comprises a first pipe body and a second pipe body, the first pipe body is provided with a vortex chamber and a nozzle, the nozzle is arranged at one end of the vortex chamber and connected with an instrument air source, the two ends of the first pipe body are a cold air opening and a hot air opening, the hot air opening is installed outside the cabinet body, and the cold air opening is installed inside the cabinet body and fixedly connected with the second pipe body. During working, air flow rotates at a high speed in the cooling structure and is separated into two parts of air flow with unequal total temperatures after vortex conversion, the air flow at the center part flows out from the cold air opening when the temperature is low, and the air flow at the outer layer part flows out from the hot air opening when the temperature is high. The technical problem that LNG and high-purity Xai gas cannot be continuously produced due to shutdown of a refrigerant compressor caused by the fact that the temperature of a control cabinet is too high is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of compression equipment, and relates to a cooling system for a PLC control cabinet of a refrigerant compressor. Background Art

[0002] The natural gas treatment plant put the natural gas liquefaction unit into trial operation on June 30, 2023. It adopts a single-cycle mixed refrigerant refrigeration process to liquefy natural gas. The mixed refrigerant is pressurized by a refrigerant compressor, and then the cold energy is transferred to the purified natural gas through heat exchange in a cold box, achieving the purpose of gradually cooling and liquefying natural gas. It is an efficient and economical technical solution, suitable for large-scale natural gas processing.

[0003] During the operation, it was found that the temperature inside the control cabinet of the refrigerant compressor was too high, with frequent alarms, resulting in the interlock shutdown of the refrigerant compressor. Once shutdown, it would cause the production suspension of the natural gas liquefaction unit, demethanation unit, and Xai gas refining unit, and it would be unable to continuously produce LNG and high-purity Xai gas. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a cooling system for a PLC control cabinet of a refrigerant compressor, which cools the inside of the PLC control cabinet of the refrigerant compressor through a cooling structure, and solves the technical problem that the high temperature of the control cabinet causes the shutdown of the refrigerant compressor and the inability to continuously produce LNG and high-purity Xai gas.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a cooling system for a PLC control cabinet of a refrigerant compressor, including: a cabinet body and a cooling structure; the cooling structure includes a first pipe body and a second pipe body. The first pipe body and the second pipe body are arranged inside the cabinet body. One end of the first pipe body is fixedly connected to the cabinet body, and the other end is fixedly connected to the second pipe body. The other end of the first pipe body is a cold air opening, and the cold air opening is connected to one side of the second pipe body. The other side of the second pipe body is arranged opposite to the control cabinet.

[0007] Further, one end of the first pipe body is a hot air opening, and the hot air opening is arranged at the end of the first pipe body far from the second pipe body and is fixedly connected to the cabinet body.

[0008] Further, an eddy current chamber is arranged on the first pipe body. The eddy current chamber is arranged near the cold air opening end, and both sides are respectively communicated with the cold air opening and the hot air opening.

[0009] Further, a nozzle is arranged at one end of the eddy current chamber. The nozzle is fixedly installed on the eddy current chamber and is communicated with the eddy current chamber.

[0010] Further, an air outlet is provided on the side of the second pipe body away from the first pipe body.

[0011] Further, the number of the air outlets gradually increases from the middle to both sides.

[0012] Further, the diameter of the air outlets gradually increases from the middle to both sides.

[0013] Further, a blocking structure is further included, and the blocking structure is movably connected to a plurality of the air outlets to open or close the corresponding air outlets.

[0014] Further, the diameter of the cold air opening gradually increases.

[0015] Further, a temperature monitor and a control switch are further included. The temperature monitor is fixedly connected inside the control cabinet, and the control switch is fixedly connected outside the control cabinet.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] For a cooling system of a refrigerant compressor PLC control cabinet of the utility model, cold air is sent into the control cabinet through a cooling structure, and hot air is sent out of the control cabinet, so as to cool the control cabinet and realize continuous production of LNG and high-purity Xai gas.

[0018] For a cooling system of a refrigerant compressor PLC control cabinet of the utility model, a plurality of air outlets are arranged on the second pipe body, and cold air can be conveyed to different positions inside the control cabinet, avoiding the situation that the temperature of a local position inside the control cabinet is too high.

[0019] For a cooling system of a refrigerant compressor PLC control cabinet of the utility model, different air outlets can be opened or closed through a blocking structure, and different air outlets can be opened according to needs.

[0020] For a cooling system of a refrigerant compressor PLC control cabinet of the utility model, the diameter of the air outlet closer to the cold air opening is smaller, so that cold air can flow more to the farther air outlet.

[0021] For a cooling system of a refrigerant compressor PLC control cabinet of the utility model, the number of the air outlets closer to the cold air opening is less, so that cold air can flow more to the farther air outlet.

[0022] For a cooling system of a refrigerant compressor PLC control cabinet of the utility model, the second pipe body can be bent as needed and bent to a position with a higher temperature.

[0023] For a cooling system of a refrigerant compressor PLC control cabinet of the utility model, the temperature inside the control cabinet is detected by a temperature monitor, and when the temperature is greater than a predetermined value, the control switch starts the cooling structure to cool. Description of the Drawings

[0024] Figure 1 This is a schematic structural diagram of a cooling system for a PLC control cabinet of a refrigerant compressor according to the present utility model;

[0025] Figure 2 This is a schematic structural diagram of the cooling structure in an embodiment of the present utility model.

[0026] Reference numerals:

[0027] 1 - Cabinet body; 2 - Cooling structure; 21 - First pipe body; 211 - Vortex chamber; 212 - Nozzle; 213 - Cold air opening; 214 - Hot air opening; 22 - Second pipe body; 221 - Air outlet. Detailed implementation manners

[0028] In order to enable those skilled in the art of the present technology to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] Embodiment 1

[0030] A cooling system for a PLC control cabinet of a refrigerant compressor according to the present utility model, as Figure 1 shown, includes: a cabinet body 1 and a cooling structure 2; the cooling structure 2 includes a first pipe body 21 and a second pipe body 22, the first pipe body 21 and the second pipe body 22 are arranged inside the cabinet body 1, one end of the first pipe body 21 is fixedly connected to the cabinet body 1, and the other end is fixedly connected to the second pipe body 22. The other end of the first pipe body 21 is a cold air opening 213 which is connected to one side of the second pipe body 22, and the other side of the second pipe body 22 is arranged opposite to the control cabinet.

[0031] Specifically, the cooling structure 2 is a vortex tube structure. When working, the compressed gas expands in the nozzle 212 and enters the vortex chamber 211 along the tangential direction. The air flow rotates at a high speed in the vortex tube. After vortex transformation, it is separated into two parts of air flow with unequal temperatures. The air flow in the central part flows out from the cold air opening 213, while the air flow in the outer layer has a high temperature and flows out from the hot air opening 214.

[0032] The cooling structure 2 is fixedly installed inside the cabinet body 1, as Figure 2As shown, the cooling structure 2 includes a first pipe body 21 and a second pipe body 22. The two ends of the first pipe body 21 are respectively provided with a cold air opening 213 and a hot air opening 214. The cold air opening 213 is installed inside the cabinet 1, and the hot air opening 214 is installed outside the cabinet 1. The second pipe body 22 is arranged at one end of the first pipe body 21 and is communicated with the cold air opening 213. A vortex chamber 211 is arranged inside the first pipe body 21. The vortex chamber 211 is arranged at one end close to the cold air opening 213, and the left and right sides thereof are communicated with the cold air opening 213 and the hot air opening 214. In this embodiment, a nozzle 212 is arranged at the upper end of the vortex chamber 211, which is connected to the instrument air source, and the nozzle 212 is communicated with the vortex chamber 211.

[0033] According to the thermodynamic principle, when the gas rotates at a high speed in the vortex tube, due to the action of the centrifugal force, the outer airflow will be subjected to a greater pressure, while the airflow in the central part has a relatively smaller pressure. At the same time, due to the rotation and friction of the gas in the vortex tube, a certain amount of heat will be generated. These heats are mainly absorbed by the outer airflow because the outer airflow has a larger contact area with the vortex tube wall and the heat exchange is more sufficient. Therefore, the outer airflow will have a relatively higher temperature due to absorbing more heat and flows out from the hot air opening 214. While the airflow in the central part has a relatively lower temperature due to the smaller pressure and less heat exchange and flows out from the cold air opening 213. During the whole process, the vortex tube does not consume external energy to generate cold air and hot air, but utilizes the energy difference generated when the gas rotates in the vortex tube and the thermodynamic effect to realize the separation of cold and heat.

[0034] On the side of the second pipe body 22 far away from the first pipe body 21, a plurality of air outlets 221 are provided. The diameter of the air outlet 221 becomes smaller as it is closer to the cold air opening 213. Due to the decrease in the diameter of the proximal air outlet 221, the cold air will be subjected to a greater resistance when flowing out of these air outlets 221, thereby slowing down the flow rate. According to Bernoulli's principle, the decrease in the flow rate will lead to an increase in the static pressure at this place. This increase in the static pressure will push more cold air to flow towards the distal end because the diameter of the distal air outlet 221 is relatively large, the resistance is small, and it is easier to attract cold air, which can more effectively utilize the cold air resources, reduce unnecessary waste, and contribute to reducing energy consumption and operating costs.

[0035] The essence of Bernoulli's principle is the conservation of the mechanical energy of an ideal fluid. Under ideal conditions, at any cross-section of the same flow tube, the sum of the kinetic energy, potential energy, and pressure potential energy of the fluid per unit volume is a constant. For example, when the fluid moves along the streamline, if its velocity increases (the dynamic pressure energy increases), then its pressure will decrease accordingly to maintain the conservation of the total energy.

[0036] The number of air outlets 221 gradually increases from the middle to both sides, enabling more cold air to flow towards the relatively distant air outlets 221. The advantages of this design are as follows: reducing the cold air flow at the proximal end: when the cold air flows out from the opening, if the number of proximal air outlets 221 is too large, a large amount of cold air will quickly flow out from these air outlets 221, causing the temperature in the proximal area to drop rapidly, while the distal area may not receive enough cold air. By reducing the number of proximal air outlets 221, the cold air flow in the proximal area can be restricted, allowing more cold air to have the opportunity to flow towards the distal end; increasing the cold air flow at the distal end: due to the reduction in the number of proximal air outlets 221, the flow rate and pressure of the cold air in the proximal area will decrease accordingly. This decrease will prompt the cold air to continue flowing forward in the pipeline or distribution system to find other air outlets for release. Therefore, the distal air outlets 221 will receive more cold air, thus achieving a more uniform distribution of cold air; optimizing the utilization efficiency of cold air: by adjusting the number and position of the air outlets 221, the utilization efficiency of cold air in the cooling system can be optimized. Reducing the number of proximal air outlets 221 and increasing the number of distal air outlets 221 (or keeping the number of distal outlets unchanged but optimizing their layout) can ensure a more balanced distribution of cold air throughout the system, reducing waste and improving the overall efficiency of the system.

[0037] The refrigerant compressor PLC control cabinet cooling system further includes a plugging structure, which is movably connected to the plurality of air outlets 221 to open or close the corresponding air outlets 221. The plugging mechanism has the following requirements: select appropriate plugging materials and structural forms according to actual needs; strictly operate in accordance with construction specifications to ensure the integrity and sealing performance of the plugging structure; conduct necessary inspections and tests during the construction process to verify whether the functions and performance of the plugging structure meet the requirements; for plugging structures in special environments (such as high temperature, high pressure, radiation, etc.), special measures need to be taken to ensure their stability and safety.

[0038] In this embodiment, the axis of the second pipe body 22 is perpendicular to the axis of the first pipe body 21, and the cold air opening 213 of the first pipe body 21 is connected to the center of the second pipe body 22. Additionally, the second pipe body 22 can be bent according to actual situations. In order to improve the thermal efficiency, sometimes it is necessary to arrange the pipeline in a region with a higher temperature. By bending the second pipe body 22, it can be bent to these regions as needed, thereby more effectively absorbing or releasing heat.

[0039] The cooling system of the refrigerant compressor PLC control cabinet further includes a temperature monitor and a control switch. The temperature monitor is fixedly connected inside the cabinet 1, and the control switch is fixedly connected outside the cabinet 1. The temperature monitor, also known as a temperature sensor or temperature detector, is a device used to measure the hot and cold degree of an object. It can provide temperature information in a readable form through electrical signals. It has a wide range of applications in industrial automation, environmental monitoring, medical equipment, and household appliances. The control switch performs switching operations through manual operation or other control signals. The temperature inside the cabinet 1 is monitored by the temperature monitor. When the temperature is greater than a predetermined value, the control switch starts the cooling structure 2 to work.

[0040] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

Claims

1. A cooling system for a refrigerant compressor PLC control cabinet, characterized in that: It includes a cabinet body (1) and a cooling structure (2); The cooling structure (2) includes a first pipe body (21) and a second pipe body (22). The first pipe body (21) and the second pipe body (22) are arranged inside the cabinet body (1). One end of the first pipe body (21) is fixedly connected to the cabinet body (1), and the other end is fixedly connected to the second pipe body (22). The other end of the first pipe body (21) is a cold air opening (213), and the cold air opening (213) is connected to one side of the second pipe body (22). The other side of the second pipe body (22) is arranged opposite to the control cabinet.

2. The cooling system for a refrigerant compressor PLC control cabinet according to claim 1, characterized in that: One end of the first pipe body (21) is a hot air opening (214). The hot air opening (214) is arranged at one end of the first pipe body (21) far from the second pipe body (22) and is fixedly connected to the cabinet body (1).

3. The cooling system for a refrigerant compressor PLC control cabinet according to claim 2, characterized in that: An eddy current chamber (211) is arranged on the first pipe body (21). The eddy current chamber (211) is arranged at one end close to the cold air opening (213), and both sides are respectively communicated with the cold air opening (213) and the hot air opening (214).

4. The cooling system for a refrigerant compressor PLC control cabinet according to claim 3, characterized in that: A nozzle (212) is arranged at one end of the eddy current chamber (211). The nozzle (212) is fixedly installed on the eddy current chamber (211) and is communicated with the eddy current chamber (211).

5. The cooling system for a refrigerant compressor PLC control cabinet according to claim 1, characterized in that: An air outlet (221) is arranged on the side of the second pipe body (22) far from the first pipe body (21).

6. The cooling system for a refrigerant compressor PLC control cabinet according to claim 5, characterized in that: The number of the air outlets (221) gradually increases from the middle to both sides.

7. The cooling system for a refrigerant compressor PLC control cabinet according to claim 5, characterized in that: The diameter of the air outlet (221) gradually increases from the middle to both sides.

8. The cooling system for a refrigerant compressor PLC control cabinet according to claim 5, characterized in that: It further includes a plugging structure. The plugging structure is movably connected to a plurality of the air outlets (221) to open or close the corresponding air outlets (221).

9. The cooling system for a refrigerant compressor PLC control cabinet according to claim 3, characterized in that: The diameter of the cold air opening (213) gradually increases.

10. The cooling system for a refrigerant compressor PLC control cabinet according to claim 8, characterized in that: It further includes a temperature monitor and a control switch. The temperature monitor is fixedly connected inside the cabinet body (1), and the control switch is fixedly connected outside the cabinet body (1).

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