DE4413944B4 - Method and device for distributing air in holds - Google Patents

Abstract

method for distributing air into a palletized load in a cargo space, for example, for distributing cooling air in the cargo stacked on pallets in the refrigerated cargo bay of a refrigerated ship, thereby characterized in that one or more blowers (1) are driven, a changeable one to generate pulsating air flow, with respect to the Charge changeable Air throw (4) is achieved.

Description

Territory of invention

The The present invention relates to a method for distributing air in holds and an apparatus for performing of the procedure. The invention is particularly suitable for feeding cooling air into a cargo in the refrigerator a refrigerated ship, especially in cold rooms without Floor grid, provided.

State of technology

In modern reefers Usually mechanical air circulation systems are used, wherein chilled Air through the cargo in the cargo bay is pressed, so that the correct temperature of the charge is maintained can be. In a refrigerated cargo bay always needs such a uniform air distribution as possible be strived for, so that the cargo is not damaged or is spoiled. The cargo can be packed in boxes on Ladpaletten can be stacked. In conventional Air circulation systems is preferably a bottom grid with holes for distributing the cooling air in Cargo space is used, with the cargo on pallets or directly on the bottom grid and the circulating air first horizontally under the bottom grid and then vertically from the bottom Bottom grid up to the load, e.g. boxes filled with fruit, is pressed. The air circulation systems from today usually generate a constant flow of air under the Floor grid or the floor grids. A relatively good distribution of cooling air can be achieved by a well-sized bottom grid.

Further, the EP 0 260 624 B2 a ventilation system for cargo spaces on ships, which only serves to supply fresh air.

Task of invention

Of the Invention is based on the object, the supply of air under better to distribute and stack a cargo stacked on pallets optimize, for example, cooled Air in a cargo bay with a cargo stacked on pallets, including systems without bottom grid, with the air blown directly under the pallets becomes. This object is achieved by a method for distributing air and a device for this solved, wherein the air throw of the supplied under the loading pallets airflow changed can be. In systems without bottom grate, where the air is direct is blown under the pallets, there is always an uncontrolled pressure drop in different parts of the cargo space depending on the way how the cargo is jammed and how the pallets are constructed.

By Controlling the blower output e.g. by a signal frequency converter or the like. is a variable according to the invention pulsating airflow with variable Air throw, periodic variations of the throw or in others Way of varying throw with or without interruptions of the resulting Air flow generated under the pallets, causing the air distribution under the pallets in the refrigerator optimized, thereby effectively avoiding certain areas the charge too little or at all no air supplied becomes.

Short description of drawings

1 shows a simplified cross-section through a cargo space in a refrigerated ship with a device according to the invention for distributing cooled air into the pallet stacked charge.

2 shows the time relationships between a, input frequency, b output frequency and c the resulting air flow and blower pressure of blowers.

Detailed description of the invention

1 shows in a simplified cross section, as several electrically driven air circulating fans 1 in connection with air ducts behind a cargo space wall of a refrigerated ship are arranged one above the other. By the blowers 1 is cooled air in air ducts 2 and more under pallets 3 with cargo, between a load compartment floor 8th and the pallets 3 pressed. arrows 9 show how cooled air from the channels 2 in rooms 7 between the loading pallets 3 and the load compartment floor 8th flows. With 4 is a resulting pulsating flow like an air throw from the fans 1 designated. The pulsating airflow is through the fans 1 whose speed is generated by a signal frequency converter 5 is controlled. A period and sequence control device, a control device 6 , which may be set to output a control signal automatically or manually, transmits to the signal frequency converter 5 a suitable control signal for driving the air circulating fans 1 , When the proper storage temperature is known and the current cargo room temperature is determined by the controller 6 can be scanned, depending on the structure and the content of the charge a suitable speed change and thus a variable pulsating air flow and a suitable Lufftsurftweite under the pallets for optimizing the cooling air distribution can be achieved with a correct temperature for the content of the charge.

2 shows the relationships between a input frequency, b output frequency and c the resulting air flow and blower pressure from the fans with respect to a time factor. The result Rende, changeable pulsating air flow from the blowers 1 will then pass through the air duct 2 and under the loading pallets 3 in the room 7 between the loading pallets 3 and the load compartment floor 8th air litters 4 generate, which in and of itself in 1 are shown, wherein the width of the Luftwurfes thus from that by the control device 6 output control signal is variable dependent.

Claims (4)

A method of distributing air into a palletized load in a cargo hold, for example, for distributing cooling air into the palletized load in the refrigerated cargo hold of a refrigerated vessel, characterized in that one or more blowers ( 1 ) to produce a variably pulsating air flow, wherein a charge air change range ( 4 ) is achieved. A method according to claim 1, characterized in that the air flow generated by the blower from an air duct ( 2 ) in a room ( 7 ) between loading pallets ( 3 ) and a cold room floor ( 8th ). Device for distributing air into a load in a cargo space, for example for distributing cooling air into the palletized charge in the refrigerated cargo hold of a refrigerated vessel, characterized in that one or more. Blower ( 1 ) are arranged to deliver a variable pulsating air flow to the charge in the cargo space in order to achieve a variable with respect to the charge Luftwurfweite. Apparatus according to claim 3, characterized in that a control device ( 6 ) is arranged, one or more control signals to a signal frequency converter ( 5 ) to provide variable control of the speed of one or more fans ( 1 ) and thus obtain a variable pulsating air flow to the charge.