RU2580455C2 - Drying chamber for sawn timber - Google Patents

Abstract

FIELD: woodworking industry.

SUBSTANCE: drying chamber for sawn timber between stacks comprises a frame partition, inside which there are vertical hollow racks of a rectangular section, connected to the fan by means of a pipeline for supplying a drying agent under pressure, having side slits with the metal frame spacings located in them, through which the drying agent is discharged to the sawn timber and each of which consists of rectangular plates with deflecting baffles mounted between them, placed at an angle of 30 degrees toward the central axis.

EFFECT: increased economical efficiency of the process of drying sawn timber by improving the efficiency of blowing-off the stack and reduction of losses.

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Description

The invention relates to techniques for drying wood, in particular to batch chambers with convective heat transfer, designed for drying lumber in the woodworking, furniture and other industries.

Known chambers for drying lumber with forced circulation of a drying agent having insulated walls, a heat source and a fan with a recirculation system of an air drying agent having discharge and suction channels (AS USSR 705218, class F26B 9/06; RF patent 1672172, class F26B 9/06), as well as the drying chambers "SPLK-2", "VALMET", "URAL-72", described in the book Sokolov P.V. and other Forestry chambers. M .: Forest industry, 1987

The disadvantages of these designs are aerodynamic losses in the recirculation channels of complex configuration and significant length, leakage of the injected drying agent past the stack with lumber. All this reduces the efficiency and effectiveness of the drying process.

A drying apparatus is also known (RF patent No. 2206842, class F26B 9/06), comprising a fan forming a horizontal circulation loop of a drying agent, a heating system for a drying agent, a moisture condensation system from a drying agent, a heat-insulated housing, according to the invention, it is equipped as at least one longitudinal frame partition formed by two vertical prismatic racks installed on the lower horizontal screen and connected by the upper horizontal beam. The frame partition divides the stack into two parts, the edges of both parts of the stack in contact with the uprights of the frame partition, and the drying agent is fed into the frame partition. The frame partition is equipped with two vertical multi-link movable plate screens, as well as an upper horizontal screen installed with the possibility of vertical movement by the amount of shrinkage of the stack during drying.

The installation is the closest in technical essence to the proposed design and is selected as a prototype.

The aim of the invention is to increase the efficiency of the drying process of lumber by improving the efficiency of blowing the stack and reduce losses.

This goal is achieved in that the drying chamber for lumber inside the partition wall contains vertical hollow rectangular posts connected to the fan by means of a pipeline for supplying a drying agent under pressure, having side slots with metal spaces placed in them, each of which consists of rectangular plates with mounted between them guide baffles, installed at an angle of 30 degrees towards the central axis.

In FIG. 1 shows a drying chamber, an end view; in FIG. 2 - view in plan; in FIG. 3 is a side view; in FIG. 4 - spation, view in plan; in FIG. 5 - position of the spatia in the rack.

The drying chamber for sawn timber contains a thermally insulated casing 1, a centrifugal fan 2 with a vertical axis of rotation, heaters 3 for heating the drying agent, a cooling unit 4 with an evaporator 5, a vertical rack 6 of the partition wall with an opening 7 for supplying the drying agent, a vertical rack 8 of the partition wall, vertical hollow racks 9 of rectangular cross section, connected to the fan 2 by means of a pipeline 10 for supplying a drying agent under pressure, having side slots 11 placed in their metal spacers 12, each of which consists of rectangular plates 13 with guide walls 14 mounted between them, mounted at an angle of 30 degrees towards the central axis.

The drying chamber operates as follows. Lumber is placed on the screen-bottom 15 of the trolley 16 so that the edges of the lumber fit snugly against the side walls of the racks 6, 8 and the hollow racks 9, i.e. contacted them on both sides.

In the slot of the uprights, the spacers 12 are laid. Then, the remaining rows are laid in the same way until the stack is completely filled, thereby sealing the chamber.

During the drying process, the drying agent is supplied under excessive pressure by the fan 2 through the opening 7 into the frame wall and is evenly distributed over the stack, also the drying agent passes through the pipeline 10 into the hollow racks 9 by the fan under pressure and goes through the racks 12 inside the stack between the lumber. As a result, due to the additional consumption of a drying agent under pressure, moisture removal from lumber is improved.

Outside the stack, the fan creates reduced pressure, and the drying agent is heated by two groups of heaters 3.

In the lower part of the heat-ventilating compartment of the chamber there is a system of moisture condensation from the drying agent, consisting of a refrigeration unit 4 with an evaporator 5, separated by a horizontal partition with a window 13, equipped with a valve 14, from the channel through which the air is taken in by the fan. When the window opens with a valve, a part of the moist warm air that is removed from the stack passes through the evaporator. Water vapor condenses on the cold surface of the evaporator, condensate collects in a pan and is gravity-discharged out of the pipe. Vertical hollow racks of rectangular cross section 9, connected to the fan by means of a pipe 10 for supplying a drying agent under pressure, having side slots 11 with metal spacers 12 placed in them, can accelerate the process of removing moisture from lumber and, thereby, reduce energy costs for drying.

Thus, the proposed technical solution ensures the achievement of the purpose of the invention and has advantages over existing analogues and prototype.

Claims (1)

A drying chamber for sawn timber, comprising a fan, a thermally insulated casing, characterized in that the drying chamber for sawn timber inside the partition wall contains vertical hollow rectangular posts connected to the fan by means of a pipeline for supplying a drying agent under pressure, having side slots with metal spaces placed therein , each of which consists of rectangular plates with guide walls mounted between them, installed at an angle m 30 degrees toward the central axis.

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