Anti-frost-crack protection device for ship air conditioner pipeline

Abstract

The utility model relates to the field of ship air-conditioning system pipeline protection, and discloses a ship air-conditioning pipeline anti-frost-crack protection device which comprises a main circulation anti-freezing section coaxially arranged on the outer wall of an air-conditioning cold water return main pipe in a sleeving mode. The branch anti-freezing section is arranged between the branch tail end small-caliber branch pipe and the air conditioner cold water return main pipe; the heating execution module comprises an electric tracing band wound on the outer wall of the air conditioner cold water return main pipe, the outer side of the electric tracing band is wrapped with a flexible heat preservation layer, and the flexible heat preservation layer is covered with a metal protection shell; and the temperature monitoring module is arranged on the outer walls of the air conditioner cold water return main pipe and the branch tail end small-caliber branch pipe and used for monitoring the temperature of media in the air conditioner cold water return main pipe and the branch tail end small-caliber branch pipe in real time. According to the utility model, by arranging the partition protection structure of the main circulation anti-freezing section and the branch anti-freezing section, the problem of insufficient anti-freezing of a small-caliber branch pipe by a traditional device is solved, an anti-freezing blind area is eliminated, and anti-freezing protection of full pipeline coverage is realized.

Description

Technical Field

[0001] This utility model relates to the field of protection of pipelines in marine air conditioning systems, and in particular to a protection device for preventing freezing and cracking of marine air conditioning pipelines. Background Technology

[0002] During ship operation, the air conditioning system is a key device to ensure the comfort of the crew's living and working environment. The ship's air conditioning system achieves heat exchange through the circulation of chilled water, and its pipeline network covers the entire ship. This device is mainly used in the air conditioning chilled water system of various types of ships such as ocean-going vessels, polar research vessels, and offshore operation vessels. It provides protection against the freezing and cracking of the air conditioning chilled water return main and small-diameter branch pipes at the end of the branch lines when the ship is sailing in cold waters (such as the Arctic Ocean and the waters around Antarctica) or anchored in winter, due to sudden drops in ambient temperature and changes in medium flow rate.

[0003] When ships sail in cold waters or anchor in winter, the medium in the air conditioning chilled water return pipes is prone to freezing due to low temperatures, leading to pipe expansion and rupture. Traditional antifreeze solutions often use electric heat tracing, but relying solely on heating has the following drawbacks: First, there is no dedicated protection for small-diameter branch pipes at the end of the ship's air conditioning system (which are more prone to freezing due to low medium flow and rapid heat dissipation), easily creating antifreeze blind spots; second, there is a lack of stress buffer structures, and when the medium in the pipes freezes and expands locally, the pipe welds and connections are prone to cracking due to stress concentration; third, the temperature threshold is fixed and cannot be dynamically adjusted according to the freezing point of seawater in different sea areas and the characteristics of the medium in the pipes, resulting in poor adaptability. Therefore, a ship air conditioning pipe antifreeze crack protection device is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art, and thus proposes a device for preventing freezing and cracking of ship air conditioning pipes. This invention, through a zoned protection structure with a main circulation anti-freezing section and branch anti-freezing sections, and by designing monitoring and heating schemes for the different characteristics of the main chilled water return pipe and the small-diameter branch pipes at the end of the branch lines, solves the problem of insufficient anti-freezing protection for small-diameter branch pipes in traditional devices, eliminates anti-freezing blind spots, achieves full-pipeline anti-freezing protection, and improves the operational safety of ship air conditioning pipes.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] The ship's air conditioning duct antifreeze and crack protection device includes a main circulation antifreeze section, which is coaxially mounted on the outer wall of the air conditioning chilled water return main pipe;

[0007] The branch antifreeze section is set between the small-diameter branch pipe at the end of the branch and the air conditioning chilled water return main pipe.

[0008] The heating execution module includes an electric heating cable wrapped around the outer wall of the air conditioner cold water return main pipe, the electric heating cable is wrapped with a flexible insulation layer, and the flexible insulation layer is covered with a metal protective shell.

[0009] The temperature monitoring module is installed on the outer wall of the main chilled water return pipe and the small-diameter branch pipe at the end of the branch, and is used to monitor the temperature of the medium inside the main chilled water return pipe and the small-diameter branch pipe at the end of the branch in real time.

[0010] The control module includes a central controller, which is electrically connected to the temperature monitoring module and the heating execution module. The central controller is used to receive temperature signals and determine whether to start the electric heating tape. The control terminal of the electric heating tape is connected to the central controller.

[0011] The pipeline stress buffer structure is installed at the tee connection of the air conditioning cold water return main. It includes an annular buffer sleeve made of elastic silicone material and a metal corrugated pipe built into the inner wall of the annular buffer sleeve. The two ends of the annular buffer sleeve are provided with sealing clamps that fit tightly against the outer wall of the small-diameter branch pipe at the end of the branch. This is used to absorb the stress caused by local ice expansion and prevent cracking of the pipeline weld or connection.

[0012] Preferably, the electric heating cable is a self-regulating electric heating cable with a power density of 15-25W / m, and is spirally wound uniformly along the direction of the air conditioning cold water return main pipe with a winding spacing of 2-3cm.

[0013] Preferably, the flexible insulation layer is a nano-aerogel composite insulation felt with a thickness of 20-30mm, and the metal protective shell is a corrosion-resistant aluminum foil layer.

[0014] Preferably, the temperature monitoring module includes at least two temperature sensors, which are respectively disposed on the outer wall of the air conditioning cold water return main pipe and the small-diameter branch pipe at the end of the branch. The detection end of the temperature sensor is tightly attached to the outer wall of the air conditioning cold water return main pipe and the small-diameter branch pipe at the end of the branch through thermally conductive silicone grease and is fixed by being wrapped with a waterproof sealing sleeve. The signal output end of the temperature sensor is connected to the central controller.

[0015] Preferably, the temperature sensor is a Pt100 platinum resistance sensor with a measurement range of -50℃ to 100℃.

[0016] Preferably, the central controller is electrically connected to both the temperature monitoring module and the heating execution module.

[0017] Preferably, the central controller is equipped with a multi-level antifreeze threshold setting unit, which is used to set multiple temperature thresholds according to the ambient temperature of the ship's navigation area, including a warning threshold T1 and a start heating threshold T2, wherein T2 is less than T1, and both T1 and T2 are dynamically adjusted according to the freezing point of seawater and the characteristics of the medium in the pipeline.

[0018] Preferably, the control module further includes a wireless communication module for uploading temperature data, heating status and fault information to the ship's central monitoring system, and for receiving remote commands to adjust parameters.

[0019] Preferably, the metal bellows has radial microfins at the crests, the height of which is 2mm to 3mm, which are used to enhance radial heat conduction to the annular closed cavity when the electric heating cable is heated. The metal bellows has axial stress relief grooves at the troughs, which are used to absorb the axial displacement between the air conditioner cold water return main pipe and the metal bellows caused by temperature difference.

[0020] Preferably, the metal bellows is made of 316L stainless steel, with an axial compression of 10mm to 15mm, and the annular buffer sleeve has a Shore hardness of 40A to 50A, capable of withstanding temperature changes from -40℃ to 120℃.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This utility model solves the problem of insufficient antifreeze protection for small-diameter branch pipes by setting up a partitioned protection structure of main circulation antifreeze section and branch antifreeze section, and designs monitoring and heating schemes for the different characteristics of air conditioning cold water return main pipe and small-diameter branch pipe at the end of the branch. It eliminates the blind spot of antifreeze protection, realizes antifreeze protection covering the whole pipeline, and improves the safety of ship air conditioning pipeline operation.

[0023] 2. This utility model adopts a self-regulating electric heating cable with a spiral winding method, combined with a nano-aerogel composite insulation layer and a corrosion-resistant aluminum foil protective shell. It can automatically adjust the heating power according to the pipeline temperature to avoid local overheating or uneven heating, and can adapt to the high humidity and high salinity environment of ships, reduce heat loss and component corrosion, and improve heating efficiency and device service life.

[0024] 3. This utility model utilizes a pipeline stress buffer structure that combines an elastic silicone annular buffer sleeve with a stainless steel corrugated pipe. The radial deformation of the annular buffer sleeve absorbs the radial stress generated by ice expansion, while the axial compression of the corrugated pipe and the stress relief groove alleviate axial displacement stress. At the same time, the microfins at the crest enhance the heat conduction efficiency during heating, preventing the formation of low-temperature dead zones in the buffer area. This effectively avoids the risk of cracking in pipeline welds and connections due to stress concentration. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0026] Figure 2 This is a schematic cross-sectional view of the overall three-dimensional structure of this utility model;

[0027] Figure 3 This is a three-dimensional structural split cross-sectional view of the heating execution module, temperature monitoring module, and pipeline stress buffer structure in this utility model.

[0028] Figure 4 This is a three-dimensional cross-sectional view of the small-diameter branch pipe and pipeline stress buffer structure at the end of the branch in this utility model.

[0029] in:

[0030] 1. Main circulation antifreeze section; 11. Air conditioning chilled water return main pipe;

[0031] 2. Anti-freezing section of branch road; 21. Small-diameter branch pipe at the end of branch road;

[0032] 3. Heating execution module; 31. Electric heating tape; 32. Flexible insulation layer; 33. Metal protective shell;

[0033] 4. Temperature monitoring module; 41. Temperature sensor;

[0034] 5. Control module; 51. Central controller; 52. Wireless communication module;

[0035] 6. Pipeline stress buffer structure; 61. Annular buffer sleeve; 62. Metal bellows; 621. Microfins; 622. Stress relief groove; 63. Sealing clamp. Detailed Implementation

[0036] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0037] like Figures 1-4 As shown, one embodiment of this utility model is provided: a ship air conditioning pipe antifreeze and crack protection device, including a main circulation antifreeze section 1, which is coaxially fitted on the outer wall of the air conditioning cold water return main pipe 11 to provide centralized antifreeze protection for the main pipe. By integrating heating, heat preservation and monitoring components, an antifreeze barrier is formed for the large-diameter main pipe. The branch antifreeze section 2 is set between the small-diameter branch pipe 21 at the end of the branch and the air conditioning cold water return main pipe 11.

[0038] like Figure 2 and Figure 3As shown, the heating execution module 3 includes an electric heating cable 31 wrapped around the outer wall of the air conditioning cold water return main pipe 11. The electric heating cable 31 is wrapped with a flexible insulation layer 32, and the flexible insulation layer 32 is covered with a metal protective shell 33. The electric heating cable 31 is a self-regulating type electric heating cable 31. Its self-regulating characteristic prevents it from overheating. Its power density is 15-25W / m, and it is evenly wound in a spiral shape along the direction of the air conditioning cold water return main pipe 11 with a winding spacing of 2-3cm. The control end of the electric heating cable 31 is connected to the central controller 51. The flexible insulation layer 32 is a nano-aerogel composite insulation felt with a thickness of 20-30mm. The metal protective shell 33 is a corrosion-resistant aluminum foil layer. The corrosion-resistant aluminum foil not only protects the soft aerogel felt from mechanical damage, but also reflects the radiant heat generated by the electric heating cable 31 back to the pipe wall, improving thermal efficiency.

[0039] like Figure 3 and Figure 4 As shown, the temperature monitoring module 4 is installed on the outer wall of the air conditioning chilled water return main 11 and the small-diameter branch pipe 21 at the end of the branch. It is used to monitor the temperature of the medium in the air conditioning chilled water return main 11 and the small-diameter branch pipe 21 in real time. The temperature monitoring module 4 includes at least two temperature sensors 41, which are respectively installed on the outer wall of the air conditioning chilled water return main 11 and the small-diameter branch pipe 21 at the end of the branch. This enables targeted monitoring of different pipe diameters and different medium flow rates, avoiding misjudgments caused by a single monitoring point. The detection end of the temperature sensor 41 is tightly attached to the outer wall of the air conditioning chilled water return main 11 and the small-diameter branch pipe 21 at the end of the branch through thermally conductive silicone grease and is fixed by a waterproof sealing sleeve. The signal output end of the temperature sensor 41 is connected to the central controller 51. The temperature sensor 41 is a Pt100 platinum resistance sensor with a measurement range of -50℃ to 100℃.

[0040] like Figures 1-4As shown, the control module 5 includes a central controller 51, which is electrically connected to the temperature monitoring module 4 and the heating execution module 3. It is used to receive temperature signals and determine whether to start the electric heating tape 31. The control terminal of the electric heating tape 31 is connected to the central controller 51. The central controller 51 is equipped with a multi-level antifreeze threshold setting unit, which is used to set multiple temperature thresholds according to the ambient temperature of the ship's navigation area. It can dynamically adapt to the freezing point of seawater in different sea areas and the characteristics of the medium in the pipeline, and realize a step-by-step response, including a warning threshold T1 and a heating start threshold T2, where T2 is less than T1, and both T1 and T2 are dynamically adjusted according to the freezing point of seawater and the characteristics of the medium in the pipeline. In the multi-level antifreeze threshold setting unit, T1 is set to be 3℃~5℃ higher than the freezing point of the medium in the pipeline, and T2 is set to be 1℃~2℃ higher than the freezing point. When the temperature sensor 41 detects that the temperature is lower than T1, the control module 5 issues an audible and visual warning signal. When the temperature sensor 41 detects that the temperature is lower than T2, the electric heating tape 31 is automatically started for heating. The control module 5 also includes a wireless communication module 52, which is used to upload temperature data, heating status and fault information to the ship's central monitoring system and receive remote commands to adjust parameters. Crew members can view and adjust parameters in the central control room or even remote terminal.

[0041] like Figures 1-4 As shown, the pipeline stress buffer structure 6 is installed at the tee connection of the air conditioning cold water return main pipe 11. It includes an annular buffer sleeve 61 made of elastic silicone material and a metal corrugated pipe 62 built into the inner wall of the annular buffer sleeve 61. The annular buffer sleeve 61 has sealing clamps 63 at both ends that fit tightly against the outer wall of the small-diameter branch pipe 21 at the end of the branch. It is used to absorb the stress caused by local freezing expansion, prevent the pipeline weld or connection from cracking, absorb radial force when local freezing expansion occurs, and protect the weld.

[0042] The metal bellows 62 has radial microfins 621 at its crests, with a height of 2mm to 3mm. These microfins enhance radial heat conduction into the annular closed cavity when the electric heating tape 31 is heating, ensuring that no low-temperature dead zones are formed inside the buffer structure and preventing stress concentration from being aggravated by local icing. The metal bellows 62 has axial stress relief grooves 622 at its troughs, which absorb the axial displacement caused by the temperature difference between the air conditioning cold water return main pipe 11 and the metal bellows 62. The metal bellows 62 is made of 316L stainless steel, with an axial compression of 10mm to 15mm. Together with the axial stress relief grooves 622 at the troughs, it alleviates the axial displacement stress caused by the temperature difference between the main pipe and the branch pipe. The annular buffer sleeve 61 has a Shore hardness of 40A to 50A and can withstand temperature changes from -40℃ to 120℃.

[0043] Working principle: When the ship enters cold waters or anchors in winter, the Pt100 temperature sensor 41 in the temperature monitoring module 4 collects the temperature of the outer wall of the air conditioning cold water return main pipe 11 and the small-diameter branch pipe 21 at the end of the branch through thermally conductive silicone grease in real time, and transmits the signal to the central controller 51 of the control module 5. The central controller 51 judges according to the preset multi-level antifreeze threshold: T1 is 3℃~5℃ above the freezing point, T2 is 1℃~2℃ above the freezing point. When the detected temperature is higher than the warning threshold T1, the system operates silently; when the detected temperature drops to T1, the central controller 51 immediately reminds the crew through an audible and visual alarm, and at the same time uploads the warning information through the wireless communication module 52; when the temperature continues to drop to T2, the central controller 51 automatically starts the electric heating tape 31 in the heating execution module 3, which spirally winds and heats the air conditioning cold water return main pipe 11. The heat is effectively retained around the pipe through the flexible insulation layer 32, while the metal protective shell 33 prevents external mechanical damage and salt spray corrosion.

[0044] If the pipeline expands due to freezing in some areas at low temperatures, the pipeline stress buffer structure 6 immediately comes into play: the annular buffer sleeve 61 absorbs the radial expansion stress through its own elastic deformation, and the axial compression of the metal bellows 62 and the stress relief groove 622 offset the axial displacement, preventing the pipeline weld or connection from cracking due to stress concentration. At the same time, the microfins 621 at the crest of the metal bellows 62 efficiently conduct the heat from the electric heating tape 31 to the interior of the buffer structure, accelerating the local heating rate.

[0045] The radial microfins 621 at the crest of the metal bellows 62 enhance the thermal conductivity during heating, while the axial stress relief grooves 622 at the troughs alleviate the material expansion and contraction stress caused by temperature changes, effectively preventing weld cracking or flange leakage. At the same time, the central controller 51 uploads temperature data, heating status and fault information to the ship's central monitoring system in real time through the wireless communication module 52, realizing remote visual management and remote parameter adjustment, so that the entire anti-freeze crack protection device can still operate safely, intelligently and reliably in the absence of human intervention.

[0046] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0047] The above description represents the preferred operating mode of this utility model. The specific operating mode description is only for better understanding the concept of this utility model. For those skilled in the art, several improvements or equivalent substitutions can be made based on the principles of this utility model, and these improvements or equivalent substitutions are also considered to fall within the protection scope of this utility model.

Claims

1. A device for preventing freezing and cracking of ship air conditioning ducts, characterized in that, include: The main circulation antifreeze section (1) is coaxially mounted on the outer wall of the air conditioning chilled water return main pipe (11); The branch antifreeze section (2) is set between the small diameter branch pipe (21) at the end of the branch and the air conditioning cold water return main pipe (11); The heating execution module (3) includes an electric heating tape (31) wrapped around the outer wall of the air conditioning cold water return main pipe (11), the electric heating tape (31) is wrapped with a flexible insulation layer (32), and the flexible insulation layer (32) is covered with a metal protective shell (33). Temperature monitoring module (4) is installed on the outer wall of the air conditioning chilled water return main pipe (11) and the small diameter branch pipe (21) at the end of the branch, and is used to monitor the temperature of the medium inside the air conditioning chilled water return main pipe (11) and the small diameter branch pipe (21) at the end of the branch in real time. The control module (5) includes a central controller (51), which is electrically connected to the temperature monitoring module (4) and the heating execution module (3) to receive temperature signals and determine whether to start the electric heating tape (31). The control terminal of the electric heating tape (31) is connected to the central controller (51). The pipeline stress buffer structure (6) is set at the tee connection of the air conditioning cold water return main pipe (11), including an annular buffer sleeve (61) made of elastic silicone material and a metal corrugated pipe (62) built into the inner wall of the annular buffer sleeve (61). The annular buffer sleeve (61) is provided with sealing clamps (63) at both ends that fit tightly against the outer wall of the small diameter branch pipe (21) at the end of the branch. The sealing clamps (63) are used to absorb the stress caused by local freezing expansion and prevent the pipeline weld or connection from cracking.

2. The anti-freezing and cracking protection device for ship air conditioning ducts according to claim 1, characterized in that: The electric heating cable (31) is a self-regulating electric heating cable (31) with a power density of 15-25W / m, and is spirally wound evenly along the direction of the air conditioning cold water return main pipe (11) with a winding spacing of 2-3cm.

3. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 1, characterized in that: The flexible insulation layer (32) is a nano-aerogel composite insulation felt with a thickness of 20-30mm, and the metal protective shell (33) is a corrosion-resistant aluminum foil layer.

4. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 1, characterized in that: The temperature monitoring module (4) includes at least two temperature sensors (41), which are respectively installed on the outer walls of the air conditioning cold water return main pipe (11) and the small diameter branch pipe (21) at the end of the branch. The detection end of the temperature sensor (41) is tightly attached to the outer wall of the air conditioning cold water return main pipe (11) and the small diameter branch pipe (21) at the end of the branch through thermal conductive silicone grease, and is fixed by a waterproof sealing sleeve. The signal output end of the temperature sensor (41) is connected to the central controller (51).

5. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 4, characterized in that: The temperature sensor (41) is a Pt100 platinum resistance sensor with a measurement range of -50℃ to 100℃.

6. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 1, characterized in that: The central controller (51) is electrically connected to the temperature monitoring module (4) and the heating execution module (3), respectively.

7. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 6, characterized in that: The central controller (51) is equipped with a multi-level antifreeze threshold setting unit, which is used to set multiple temperature thresholds according to the ambient temperature of the ship's navigation area, including a warning threshold T1 and a start heating threshold T2, wherein T2 is less than T1, and both T1 and T2 are dynamically adjusted according to the freezing point of seawater and the characteristics of the medium in the pipeline.

8. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 1, characterized in that: The control module (5) also includes a wireless communication module (52), which is used to upload temperature data, heating status and fault information to the ship's central monitoring system and receive remote commands to adjust parameters.

9. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 1, characterized in that: The metal bellows (62) has radial microfins (621) at the crests, and the height of the microfins (621) is 2mm to 3mm. They are used to enhance radial heat conduction to the annular closed cavity when the electric heating tape (31) is heated. The metal bellows (62) has axial stress relief grooves (622) at the troughs, which are used to absorb the axial displacement caused by the temperature difference between the air conditioning cold water return main pipe (11) and the metal bellows (62).

10. The anti-freezing and crack protection device for ship air conditioning ducts according to claim 9, characterized in that: The metal bellows (62) is made of stainless steel 316L and has an axial compression of 10mm to 15mm. The annular buffer sleeve (61) has a Shore hardness of 40A to 50A and can withstand temperature changes from -40℃ to 120℃.

Images