Frequency converter cooling system

Abstract

The utility model relates to a frequency converter cooling system. Comprising a first-stage heat exchange device and a second-stage heat exchange device; the first-stage heat exchange device comprises a first-stage plate heat exchanger, a first-stage water inlet pipe is connected to a first-stage side inlet of the first-stage plate heat exchanger, a first-stage water pump is installed at the end of the first-stage water inlet pipe, a first-stage water supply pipe is installed at an inlet of the first-stage water pump, and a water drainage pipe is installed on a first-stage side outlet of the first-stage plate heat exchanger. The second-stage heat exchange device comprises a plurality of second-stage plate heat exchangers arranged side by side, primary side inlet pipelines are converged to a second-stage water inlet pipe, and the second-stage water inlet pipe is connected to secondary side outlets of the first-stage plate heat exchangers through a second-stage water pump and a second-stage water distribution pipe. And a primary side outlet of each secondary plate heat exchanger is connected to a secondary side inlet of the primary plate heat exchanger through a secondary water collecting pipe. According to the utility model, corrosive seawater is separated from the frequency converter facility, cold-out crystal water is prevented from being formed by preventing the temperature of the cooling assembly of the frequency converter from being too low, and the stable operation of the frequency converter facility for the ship is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of ship facilities, and in particular relates to a frequency converter cooling system. Background Art

[0002] Frequency converters (VFDs) are essential ship infrastructure. During operation, they generate significant heat, causing the temperature of the ship's machinery to rise. Therefore, for safe and stable operation, marine VFDs require cooling systems to dissipate heat generated during operation and prevent overheating. Existing technologies typically use cooling assemblies to cool marine VFDs. Specifically, seawater pumps draw low-temperature seawater through a seawater main pipe within the ship's seabed door into the cooling assembly. After heat exchange, the water is discharged into the surrounding water. This cooling water cycle continuously dissipates the heat generated by the marine VFD during operation.

[0003] The above-mentioned cooling device and cooling method of the inverter have the following problems: First, seawater is corrosive. If the cooling component is damaged, the corrosive seawater will further damage the inverter and related facilities; second, in some extremely low temperature sea areas or low temperature climate conditions, the temperature of the seawater drawn into the cooling component is extremely low, and cold crystallized water (condensed water) will form on the outer wall of the cooling component. This part of the cold crystallized water gradually gathers, posing a threat or damage to the electrical components in the inverter. In severe cases, equipment failure will occur, leading to shutdown.

[0004] In summary, it is necessary to develop and design a new inverter cooling system to solve the above-mentioned technical problems based on the full utilization of low-temperature seawater in the surrounding sea area. Utility Model Content

[0005] The purpose of the utility model is to provide a frequency converter cooling system, which isolates corrosive seawater from the frequency converter facilities, avoids the formation of cold-precipitated crystallized water by preventing the temperature of the frequency converter cooling components from being too low, and ensures the stable operation of the marine frequency converter facilities.

[0006] The technical solution adopted by the utility model is: a frequency converter cooling system, including a primary heat exchange device and a secondary heat exchange device; the primary heat exchange device includes a primary plate heat exchanger, a primary water inlet pipe is connected to the primary side inlet of the primary plate heat exchanger, a primary water pump is installed at the end of the primary water inlet pipe, a primary water supply pipe is installed at the inlet of the primary water pump, and a drain pipe is installed on the primary side outlet of the primary plate heat exchanger; the secondary heat exchange device includes a plurality of secondary plate heat exchangers arranged in parallel, a self-operated temperature control valve is installed on the primary side inlet pipe of each secondary plate heat exchanger, each primary side inlet pipe converges into the secondary water inlet pipe, the secondary water inlet pipe is connected to the secondary side outlet of the primary plate heat exchanger through the secondary water pump and the secondary water distribution pipe, and the primary side outlet of each secondary plate heat exchanger is connected to the secondary side inlet of the primary plate heat exchanger through the secondary collecting pipe; the cooling component configured for the frequency converter is connected between the secondary side inlet and the secondary side outlet of the secondary plate heat exchanger, and a circulating pump is provided on the connecting pipe, and also includes a temperature sensor for detecting the temperature of the cooling component.

[0007] Preferably, a filter is installed at the outer end of the first-level water supply pipe, and the filter is used to filter the extracted seawater.

[0008] Preferably, it also includes a seawater suction pipe and a seawater discharge pipe arranged in the seabed door of the ship, the inner end of the seawater suction pipe is docked with the inlet of the filter, and the inner end of the seawater discharge pipe is docked with the outer end of the drain pipe.

[0009] Preferably, two primary water pumps are provided in parallel between the primary water inlet pipe and the primary water delivery pipe, and the two primary water pumps constitute one for use and one for backup.

[0010] Preferably, two secondary water pumps are provided in parallel between the secondary water distribution pipe and the secondary water inlet pipe, and the two secondary water pumps constitute one for use and one for backup.

[0011] Preferably, a base frame is further included, and the primary heat exchange device and the secondary heat exchange device are both mounted and fixed on the base frame.

[0012] The advantages and positive effects of the utility model are:

[0013] The present invention provides a frequency converter cooling system. Compared with existing marine frequency converter cooling devices and cooling methods, the frequency converter cooling system of the present invention mainly comprises a primary heat exchange device and a secondary heat exchange device, wherein the secondary heat exchange device is used to isolate the primary heat exchange device from the frequency converter cooling assembly. The heat exchange medium circulating in the secondary heat exchange device and the cooling assembly is clean water, and the heat exchange medium flowing in the primary heat exchange device is low-temperature seawater extracted from the surrounding waters. In this way, the isolation provided by the secondary heat exchange device can make the primary heat exchange device relatively far away from the frequency converter and its cooling assembly, effectively avoiding potential damage to the facilities due to the corrosion effect of seawater.

[0014] On the other hand, by arranging a temperature sensor for detecting the temperature of the cooling component on the cooling component of the inverter, and installing a self-operated temperature control valve on the primary side inlet pipe of each secondary plate heat exchanger, temperature-based valve opening control is achieved, that is, the water flow on the primary side of different secondary plate heat exchangers is self-regulated according to the temperature feedback signal of the cooling component, thereby preventing the cooling component of the inverter from cooling to the extent of producing cold precipitation crystallization water. Therefore, during long-term operation, this inverter cooling system can not only provide stable cooling effect for the inverter, but also avoid the formation of cold precipitation crystallization water by preventing the temperature of the inverter cooling component from being too low, thereby ensuring the stable operation of the marine inverter facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle-stage heat exchange device;

[0017] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the secondary heat exchange device.

[0018] In the picture:

[0019] 1. Base frame; 2. Primary water inlet pipe; 3. Primary water pump; 4. Primary water supply pipe; 5. Filter; 6. Seawater suction pipe; 7. Seawater discharge pipe; 8. Primary plate heat exchanger; 9. Secondary water pump; 10. Secondary water distribution pipe; 11. Secondary water collecting pipe; 12. Secondary return pipe; 13. Secondary water inlet pipe; 14. Secondary connecting pipe; 15. Secondary plate heat exchanger; 16. Circulation pump; 17. Temperature sensor; 18. Cooling assembly; 19. Frequency converter; 20. Self-operated temperature control valve. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given to illustrate in detail.

[0021] See Figure 1 、 Figure 2 and Figure 3 The inverter cooling system of the present invention includes a primary heat exchanger and a secondary heat exchanger. In this embodiment, it also includes a base frame 1, to which both the primary and secondary heat exchangers are mounted and fixed. This allows the inverter cooling system to be skid-mounted, facilitating integrated transfer and deployment.

[0022] Its operating principle is as follows: clean water circulates as a heat exchange medium in the cooling component 18 of the inverter 19, and this clean water absorbs the heat energy generated when the inverter 19 is running; clean water circulates as a heat exchange medium in the secondary heat exchange device, and this clean water exchanges heat with the circulating clean water in the cooling component 18, so that the temperature of the circulating clean water in the cooling component 18 is reduced; low-temperature seawater drawn from the waters around the ship flows in the primary heat exchange device, and this low-temperature seawater exchanges heat with the circulating clean water in the primary heat exchange device, so that the temperature of the circulating clean water in the primary heat exchange device is reduced. In this way, the heat energy generated when the inverter 19 is running is finally exchanged to the seawater.

[0023] In the present invention, the secondary heat exchange device is located between the cooling component 18 of the inverter 19 and the primary heat exchange device, so that the cooling component 18 and the primary heat exchange device are appropriately isolated, which can make the primary heat exchange device relatively far away from the inverter 19 and its cooling component 18, effectively avoiding potential damage to the facilities due to the corrosion of seawater.

[0024] See Figure 2 , we can see that:

[0025] The primary heat exchange device includes a primary plate heat exchanger 8, with a primary water inlet pipe 2 connected to its primary inlet. A primary water pump 3 is installed at the end of the primary water inlet pipe 2. A primary water supply pipe 4 is installed at the inlet of the primary water pump 3. A drain pipe is installed at the primary outlet of the primary plate heat exchanger 8. When the primary water pump 3 is in operation, it draws low-temperature seawater from the surrounding area of ​​the ship through the primary water supply pipe 4. The low-temperature seawater enters the primary side of the primary plate heat exchanger 8 through the primary water inlet pipe 2 and, after heat exchange, is discharged from the primary side through the drain pipe.

[0026] In this embodiment, a filter 5 is also installed at the outer end of the primary water supply pipe 4. The filter 5 is used to filter the extracted seawater, effectively intercepting and removing particulate matter in the seawater, making the extracted low-temperature seawater relatively clean and avoiding pipe blockage problems. Furthermore, it also includes a seawater suction pipe 6 and a seawater discharge pipe 7 arranged in the seabed door of the ship. The inner end of the seawater suction pipe 6 is docked with the inlet of the filter 5, and the inner end of the seawater discharge pipe 7 is docked with the outer end of the drain pipe. When the primary water pump 3 is in operation, low-temperature seawater enters through the seawater suction pipe 6 and is filtered by the filter 5. Finally, the seawater after heat exchange returns to the waters around the ship through the drain pipe and the seawater discharge pipe 7.

[0027] In this embodiment, two first-level water pumps 3 are arranged in parallel between the first-level water inlet pipe 2 and the first-level water supply pipe 4. The two first-level water pumps 3 constitute one for use and one for backup. When one of the first-level water pumps 3 fails in operation, it is switched to the other first-level water pump 3 to ensure the normal operation of the system.

[0028] See Figure 3 , we can see that:

[0029] The secondary heat exchange device includes multiple secondary plate heat exchangers 15 arranged in parallel. Generally, the number of secondary plate heat exchangers 15 is the same as the number of inverters 19 and their cooling components 18, that is, the secondary plate heat exchangers 15 are arranged one-to-one with the inverters 19 and their cooling components 18.

[0030] A self-operated temperature control valve 20 is installed on the primary inlet pipeline of each secondary plate heat exchanger 15. Each primary inlet pipeline converges into a secondary water inlet pipe 13, which is connected to the secondary outlet of the primary plate heat exchanger 8 via a secondary water pump 9 and a secondary water distribution pipe 10. The primary outlet of each secondary plate heat exchanger 15 is connected to the secondary inlet of the primary plate heat exchanger 8 via a secondary water header 11. Therefore, under the action of the secondary water pump 9, clean water discharged from the secondary side of the primary plate heat exchanger 8 first enters the secondary water distribution pipe 10 and then the secondary water inlet pipe 13. There, it is divided into multiple paths and enters the primary inlet of the corresponding secondary plate heat exchanger 15 through each primary inlet pipeline and its self-operated temperature control valve 20. After heat exchange in the secondary plate heat exchanger 15, the clean water is discharged from the primary outlet and enters the secondary water header 11. The secondary water header 11 then delivers the clean water to the secondary inlet of the primary plate heat exchanger 8, thus forming a clean water circulation system.

[0031] The self-operated temperature control valve 20 controls the temperature change by controlling the flow rate of the medium in the pipeline. The self-operated temperature control valve 20 is within the scope of the existing technology, and its structure and function are not described in detail.

[0032] A cooling assembly 18, configured with a frequency converter 19, is connected between the secondary inlet and outlet of the secondary plate heat exchanger 15. A circulating pump 16 and a temperature sensor 17 for detecting the temperature of the cooling assembly 18 are provided in the connecting pipeline. The circulating pump 16 circulates clean water between the cooling assembly 18 and the secondary side of the secondary plate heat exchanger 15.

[0033] The temperature signal detected by the temperature sensor 17 is used as the action response signal of the self-operated temperature control valve 20. An appropriate temperature value should be set for the self-operated temperature control valve 20. When the temperature value of the cooling component 18 detected by the temperature sensor 17 approaches the temperature at which cold-precipitated crystallized water (condensed water) is generated on the surface, the self-operated temperature control valve 20 should fully reduce the flow rate of the cold medium to prevent the cooling component 18 from reaching the temperature at which cold-precipitated crystallized water is generated on the surface. In this way, the potential damage to the inverter 19 caused by the generation of cold-precipitated crystallized water can be effectively avoided, thereby ensuring the stable operation of the marine inverter facilities.

[0034] In this embodiment, two secondary water pumps 9 are arranged in parallel between the secondary water distribution pipe 10 and the secondary water inlet pipe 13. The two secondary water pumps 9 constitute one for use and one for backup. When one of the secondary water pumps 9 fails in operation, it switches to the other secondary water pump 9 to ensure the normal operation of the system.

[0035] Operation process:

[0036] Start the primary water pump 3, which pumps low-level seawater around the ship into the primary side of the primary plate heat exchanger 8 to form a continuous low-temperature seawater circulation; start the secondary water pump 9, and the clean water inside circulates between the primary side of each secondary plate heat exchanger 15 and the secondary side of the primary plate heat exchanger 8; start the circulation pump 16, and the clean water inside circulates between the cooling assembly 18 and the secondary side of the corresponding secondary plate heat exchanger 15; the heat energy generated by the inverter 19 during operation is first exchanged with the clean water in the cooling assembly 18, then with the clean water in the primary side of the secondary plate heat exchanger 15, and finally with the seawater in the primary side of the primary plate heat exchanger 8, achieving the effect of continuously cooling the inverter 19;

[0037] Each set of self-operated temperature control valves 20 and their temperature sensors 17 prevent each cooling component 18 from reaching a temperature at which cold crystallized water (condensed water) is generated on the surface by measuring the temperature of the corresponding cooling component 18 and adjusting the flow of low-temperature clean water entering the primary side of each secondary plate heat exchanger 15. In this way, when a ship using this inverter cooling system is sailing or operating in extremely low temperature waters or low temperature climate conditions, there will be no problem of condensed water generated on the surface of the cooling component 18 due to the cooling component 18 being cooled to a low temperature.

Claims

1. A frequency converter cooling system, characterized by: The invention comprises a primary heat exchange device and a secondary heat exchange device; the primary heat exchange device comprises a primary plate heat exchanger (8), a primary water inlet pipe (2) is connected to the primary side inlet of the primary plate heat exchanger, a primary water pump (3) is installed at the end of the primary water inlet pipe (2), a primary water supply pipe (4) is installed at the inlet of the primary water pump (3), and a drainage pipe is installed at the primary side outlet of the primary plate heat exchanger (8); the secondary heat exchange device comprises a plurality of secondary plate heat exchangers (15) arranged in parallel, a self-operated temperature control valve (20) is installed on the primary side inlet pipe of each secondary plate heat exchanger (15), and the primary side inlet pipes of each secondary plate heat exchanger (15) converge into a water supply pipe (4). The secondary water inlet pipe (13) is connected to the secondary side outlet of the primary plate heat exchanger (8) through a secondary water pump (9) and a secondary water distribution pipe (10), and the primary side outlet of each secondary plate heat exchanger (15) is connected to the secondary side inlet of the primary plate heat exchanger (8) through a secondary water collecting pipe (11); the cooling component (18) configured by the frequency converter (19) is connected between the secondary side inlet and the secondary side outlet of the secondary plate heat exchanger (15), and a circulating pump (16) is provided on the connecting pipeline, and a temperature sensor (17) for detecting the temperature of the cooling component (18) is also included.

2. The inverter cooling system according to claim 1, wherein: A filter (5) is also installed at the outer end of the first-level water supply pipe (4), and the filter (5) is used to filter the extracted seawater.

3. The inverter cooling system according to claim 2, wherein: The invention also comprises a seawater suction pipe (6) and a seawater discharge pipe (7) arranged in the seabed door of the ship, wherein the inner end of the seawater suction pipe (6) is butt-connected to the inlet of the filter (5), and the inner end of the seawater discharge pipe (7) is butt-connected to the outer end of the drainage pipe.

4. The inverter cooling system according to claim 3, wherein: Two primary water pumps (3) are arranged in parallel between the primary water inlet pipe (2) and the primary water delivery pipe (4), and the two primary water pumps (3) form one for use and one for backup.

5. The inverter cooling system according to claim 4, wherein: Two secondary water pumps (9) are arranged in parallel between the secondary water distribution pipe (10) and the secondary water inlet pipe (13), and the two secondary water pumps (9) form one for use and one for backup.

6. The inverter cooling system according to claim 5, wherein: It also includes a base frame (1), and the first-stage heat exchange device and the second-stage heat exchange device are both installed and fixed on the base frame (1).

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