External motor-driven fan for liquefied gas carrier

Abstract

The utility model discloses a motor external ventilator of liquefied gas transport ship, including the ventilating tube of installation on deck and the fan cover of upside down in its top, the fan cover is installed the fan, and the rotating shaft terminal fixed blade extends into the ventilating tube. The diameter of fan cover is greater than the ventilating tube, and forms the air outlet of opening downward with the ventilating tube. The rotatable circular sealing baffle is installed to the inner wall of ventilating tube through the baffle support, and the worm of one side is engaged with the worm wheel of outer wall rotating handle, and the sealing baffle opening and closing ventilating tube can be controlled through handle rotating handle. The outer edge of sealing baffle is installed annular sealing ring and enhances the leakproofness. The ventilator avoids the falling of foreign matter, can control ventilation flexibly, satisfies relevant specification requirement, and simple structure, convenient operation.

Description

Technical Field

[0001] This utility model relates to liquefied gas transport ships, specifically to an externally mounted motor ventilation fan for liquefied gas transport ships. Background Technology

[0002] In the design of ships such as liquefied gas carriers, due to the flammable, explosive or other characteristics of the cargo they carry, there are designated gas hazard areas and zones, which brings about a series of requirements for ventilation design.

[0003] According to the IGC Code for Construction and Equipment of Ships Carrying Liquefied Gases in Bulk, the motors driving the fans should be installed outside the ventilation ducts that may contain flammable vapors in areas that are not normally accessible within the cargo area.

[0004] In addition, according to the requirements of the International Load Line Convention, ventilation ducts on open freeboard decks and aft raised decks, as well as on open superstructure decks located up to one-quarter of the length from the forward perpendicular, must be equipped with enclosed devices.

[0005] Given these regulatory requirements, it is of great significance to design an externally mounted motor-driven ventilator with a closable device for mechanical ventilation in hazardous areas such as the bow of a ship. Utility Model Content

[0006] This utility model provides an external motor ventilator for a liquefied gas transport ship. The external motor ventilator includes a ventilation cylinder installed on the deck and a fan cover installed upside down on the top of the ventilation cylinder. A fan is installed inside the fan cover, and the fan's rotation axis extends downward into the ventilation cylinder and has blades fixed at its end.

[0007] The diameter of the fan cover is larger than the diameter of the ventilation duct, and the lower end face of the fan cover is lower than the upper surface of the ventilation duct. There is a gap between the fan cover and the ventilation duct, forming an air outlet with the opening facing downwards.

[0008] Baffle supports are welded to both sides of the inner wall of the ventilation duct. A circular sealing baffle is installed between the baffle supports. The sealing baffle rotates vertically about the line connecting the two baffle supports to open or close the ventilation duct. A worm gear is fixed to one side of the sealing baffle, penetrating the side wall of the ventilation duct.

[0009] A rotating handwheel is installed on the outer wall of the ventilation duct. A worm gear that meshes with the worm is fixed at the front end of the rotating handwheel, and a handle is fixed at the rear end.

[0010] Furthermore, a handwheel bracket for mounting the rotating handwheel is fixed on the outer wall of the ventilation duct. Two first ball bearings are coaxially mounted on the handwheel bracket. The rotating handwheel passes through the two first ball bearings, and the worm gear is located between the two ball bearings.

[0011] Furthermore, the circular sealing baffle has outwardly extending rotating shafts fixed at both ends in the radial direction, and the circular sealing baffle is rotatably installed between the two baffle supports via the rotating shafts.

[0012] One of the rotating shafts passes through the side wall of the ventilation duct and is fixed with a worm gear.

[0013] Furthermore, one outer edge of the circular sealing baffle is provided with a rolled edge, and an annular sealing ring is installed on the rolled edge.

[0014] Furthermore, the inner side of the annular sealing ring is provided with a slot for connection with the rolled edge, and the outer side is provided with an annular O-ring.

[0015] Furthermore, the annular sealing ring is integrally injection molded from rubber, and elastic tongues are staggered on both sides inside the slot.

[0016] The advantages of this utility model are:

[0017] 1) The inverted fan cover forms an air outlet with the opening facing downwards, which can prevent foreign objects from falling into the ventilation duct.

[0018] 2) A rotatable sealing baffle is installed inside the ventilation duct. The sealing baffle can be rotated inside the ventilation duct by rotating the handwheel: when the sealing baffle is rotated to be consistent with the axial direction of the ventilation duct, air can pass through the ventilation duct smoothly; when the sealing baffle is rotated to be perpendicular to the axial direction of the ventilation duct, the sealing baffle closes the air inlet channel, and at the same time, it further prevents foreign objects from entering the air duct.

[0019] 3) The outer edge of one side of the circular sealing baffle is rolled, and an annular sealing ring is installed on the rolled edge. The inner slot of the sealing ring is inserted into the rolled edge, and an O-ring is on the outer side. This design allows the O-ring to fit tightly against the inner wall of the ventilation duct when the sealing baffle is closed, forming a good sealing surface and enhancing the sealing effect.

[0020] 4) This design complies with the requirements of the IGC Code for Construction and Equipment of Ships Carrying Liquefied Gases in Bulk, which requires that the motors driving the fans be installed outside the ventilation ducts that may contain flammable vapors, and the requirements of the International Load Line Convention for the installation of enclosed devices on ventilation ducts on open decks, thus demonstrating good compliance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is a side view of an externally mounted ventilator for a liquefied gas transport ship according to the present invention.

[0023] Figure 2 for Figure 1 Cross-sectional view of AA;

[0024] Figure 3 for Figure 2 Cross-sectional view of BB;

[0025] Figure 4 for Figure 2 Cross-sectional view of CC;

[0026] Figure 5 for Figure 3 A magnified view of section A in the image. Detailed Implementation

[0027] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0028] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0029] Reference Figure 1-4 As shown, this utility model provides an externally mounted motor ventilator for a liquefied gas transport ship. The externally mounted motor ventilator includes a ventilation duct 100 installed on the deck and a fan cover 200 invertedly mounted on top of the ventilation duct 100. A fan 210 is installed inside the fan cover 200, and the rotating shaft 211 of the fan 210 extends downward into the ventilation duct 100 with blades 212 fixed at its end. A rubber shock-absorbing pad is also installed between the ventilation duct and the deck to seal and reduce vibration transmission.

[0030] The diameter of the fan cover 200 is larger than that of the ventilation duct 100, and the lower end face of the fan cover 200 is lower than the upper surface of the ventilation duct 100. There is a gap between the fan cover 200 and the ventilation duct 100, forming a downward-facing air outlet. In rainy weather, rainwater will flow down the outer wall of the fan cover and will not enter the ventilation duct. When debris falls, because the air outlet faces downward, the debris will be blocked outside the ventilation duct, effectively preventing foreign objects from entering the ventilation duct and blocking the air duct.

[0031] Baffle supports 110 are welded to both sides of the inner wall of the ventilation duct 100. A circular sealing baffle 120 is installed between the baffle supports 110. The diameter of the sealing baffle is slightly smaller than the inner diameter of the ventilation duct to ensure that the sealing baffle can rotate freely inside the ventilation duct. The sealing baffle 120 rotates vertically about the line connecting the two baffle supports 110 as the axis of rotation to open or close the ventilation duct 100. A worm gear 121 is fixed to one side of the sealing baffle 120, penetrating the side wall of the ventilation duct 100.

[0032] A rotating handwheel 130 is installed on the outer wall of the ventilation duct 100. A worm gear 131 that meshes with the worm 121 is fixed at the front end of the rotating handwheel 130, and a straight handle 132 is fixed at the rear end.

[0033] In an optional embodiment, a handwheel bracket 140 for mounting a rotating handwheel 130 is fixed on the outer wall of the ventilation duct 100. Two first ball bearings are coaxially mounted on the handwheel bracket 140. The rotating handwheel 130 passes through the two first ball bearings and the worm gear is located between the two ball bearings.

[0034] In an optional embodiment, the circular sealing baffle 120 has outwardly extending rotating shafts 122 fixed at both ends in the radial direction, and the circular sealing baffle 120 is rotatably mounted between two baffle supports 110 via the rotating shafts 122; one of the rotating shafts 122 passes through the side wall of the ventilation duct 100 and is fixed with a worm gear 121.

[0035] In an alternative embodiment, such as Figure 5 As shown, a rolled edge 123 is provided on one outer edge of the circular sealing baffle 120, which is manufactured by stamping. The purpose of the rolled edge is to install the annular sealing ring and to enhance the strength of the edge of the sealing baffle. An annular sealing ring 124 is installed on the rolled edge 123. The inner side of the annular sealing ring 124 has a slot 125 for insertion and connection with the rolled edge, and the outer side has an annular O-ring 126. Preferably, the annular sealing ring 124 is integrally injection molded from rubber. Elastic tongues 127 are staggered on both sides inside the slot 125. When the annular sealing ring is installed on the rolled edge, the elastic tongues will elastically deform and tightly lock the rolled edge, thereby enhancing the stability of the connection between the annular sealing ring and the rolled edge and preventing the sealing ring from falling off during use.

[0036] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. An externally mounted ventilator for a liquefied gas transport ship, characterized in that, The external motor ventilator includes a ventilation duct installed on the deck and a fan cover installed upside down on top of the ventilation duct. A fan is installed inside the fan cover, and the fan's rotation axis extends downward into the ventilation duct and has blades fixed at its end. The diameter of the fan cover is larger than the diameter of the ventilation duct, and the lower end face of the fan cover is lower than the upper surface of the ventilation duct. There is a gap between the fan cover and the ventilation duct, forming an air outlet with the opening facing downwards. Baffle supports are welded to both sides of the inner wall of the ventilation duct. A circular sealing baffle is installed between the baffle supports. The sealing baffle rotates vertically about the line connecting the two baffle supports to open or close the ventilation duct. A worm gear is fixed to one side of the sealing baffle, penetrating the side wall of the ventilation duct. A rotating handwheel is installed on the outer wall of the ventilation duct. A worm gear that meshes with the worm is fixed at the front end of the rotating handwheel, and a handle is fixed at the rear end.

2. The externally mounted ventilator for a liquefied gas transport ship as described in claim 1, characterized in that, A handwheel bracket for mounting a rotating handwheel is fixed on the outer wall of the ventilation duct. Two first ball bearings are coaxially mounted on the handwheel bracket. The rotating handwheel passes through the two first ball bearings, and the worm gear is located between the two ball bearings.

3. The externally mounted ventilator for a liquefied gas transport ship as described in claim 1, characterized in that, The circular sealing baffle has outwardly extending rotating shafts fixed at both ends in the radial direction, and the circular sealing baffle is rotatably installed between two baffle supports via the rotating shafts. One of the rotating shafts passes through the side wall of the ventilation duct and is fixed with a worm gear.

4. The externally mounted ventilator for a liquefied gas transport ship as described in claim 1, characterized in that, The outer edge of one side of the circular sealing baffle is provided with a rolled edge, and an annular sealing ring is installed on the rolled edge.

5. The externally mounted ventilator for a liquefied gas transport ship as described in claim 4, characterized in that, The inner side of the annular sealing ring has a slot for connecting with the rolled edge, and the outer side has an annular O-ring.

6. The externally mounted ventilator for a liquefied gas transport ship as described in claim 5, characterized in that, The annular sealing ring is integrally injection molded from rubber, and elastic tongues are staggered on both sides inside the slot.

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