RU2511572C9 - Thermal protection module - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention relates to mechanical devices of thermal, wind and light protection together with an exhaust fan, which are used in ventilation systems installed in poultry and pig breeding areas. A thermal protection module containing a housing made in the form of a box and two flaps equipped with a spring for closing; with that, the module housing is solid-cast, with a shape of an inlet opening without any acute angles and flaps of the module, which are made from foam polyurethane, have an aerodynamic shape and provide tight connection to the module housing.

EFFECT: module allows considerably reducing air ingress at a non-operating fan, thus increasing a heat insulation degree, and reducing a noise level at an operating fan and improving fan capacity due to absence of gravitational louvres.

5 dwg, 3 tbl

Description

Technical field

Thermal insulation modules are used in ventilation systems installed in poultry and pig-breeding premises.

State of the art

Known axial fans VO-5.0, VO-5.6, VO-7.1 and VO-8.0 manufactured by VentTechcom, in which mechanical devices are gravity shutters containing a casing and flaps made of galvanized steel, www.ventech .ru / info / contacts.

The main disadvantages of the known device are that poor tightness with an idle fan. It should be noted that at a vacuum of 30 Pa, about a thousand cubic meters per hour of air flows through a fan with gravity shutters, which is about 10% of the fan capacity and significantly violates the operation of the supply and exhaust ventilation. When operating at low engine fan speeds, gravity shutters do not open. With the fan running, high noise levels prevail.

Disclosure of invention

The invention The thermal protection module relates to mechanical devices for thermal, wind and light protection together with an exhaust fan.

The case of the thermal protection module is made of polyurethane foam, in the form of a box, is made of solid cast, with the shape of the inlet without sharp corners. The flaps of the thermal protection module are made of polyurethane foam, aerodynamic shape, provide a snug fit to the module body, which increases the thermal insulation properties of the thermal protection module. The matrix for the module is made using a numerically controlled machining center, which ensures accurate fit of the module flaps, and thereby reduces air leakage to almost zero.

The objective of the invention is a significant reduction in air leakage of an idle fan, an increase in its heat-insulating properties. When the fan is running, noise reduction and fan performance increase due to the absence of gravity shutters.

This is achieved by the fact that, unlike gravitational blinds, the design of the module box prevents the penetration of cold air directly onto the bird. The special shape of the module inlet without sharp angles carries out air movement without turbulence, thereby reducing losses in fan performance. When the fan is turned on under the action of the air flow, the aerodynamic flaps of the Thermal Protection Module open. When controlling the fan speed, the module flaps open and close smoothly, thereby reducing the noise level.

The device operates as follows. When the fan is turned on under the action of the air flow, the aerodynamic flaps of the Thermal Protection Module open. Due to the special shape of the module inlet without sharp corners, air flows without turbulence, thereby reducing losses in fan performance. The aerodynamic shape of the valves allows you to direct the energy of the air flow to open the valves without unnecessary losses. Incoming air flows around the wings, taking the desired direction and speed. This effect is especially evident when regulating the fan speed using a frequency converter. Already at low speeds, the valves open at a small distance due to an increase in the speed (force) of air.

When the fan is turned off, the shutters of the Module move to the closed state. When the microclimate system operates on the principle of rarefaction, an additional force is created on the wings, increasing the tightness of the module j as a whole.

Brief Description of the Drawings

Figure 1 - appearance of the thermal protection module.

Figure 2 - the movement of air when opening the flaps of the thermal protection module.

Figure 3 - position of the flaps of the thermal protection module when the fan is idle.

Figure 4 - air movement with closed gravitational blinds (right view).

Figure 5 - air movement with the closed wings of the thermal protection module (top view).

The device thermal protection module comprises a housing (1), an aerodynamic flap (2), a spring (3).

The implementation of the invention

When testing the thermal insulation module in an aerodynamic test installation made in accordance with GOST 10921-90, a standard Russian-made fan VO-7.1 with inertial shutters and a standard Russian-made fan VO-7.1 with a thermal insulation module were taken for comparison. The data is as follows.

Table 1 Vacuum in the chamber, Pa Productivity, m ³ / hour Motor current, A VO-7.1 with inertial blinds VO-7.1 with the Module VO-7.1 with inertia and blinds VO-7.1 with the Module 0 8659 8590 0.94 0.89 10 8139 7862 0.95 0.90 twenty 7551 7100 0.96 0.91 thirty 6962 6408 0.97 0.93 40 6408 5715 0.98 0.93 fifty 5715 4918 0.99 0.94

Performance assessment at different vacuum values

table 2 Vacuum in the chamber, Pa Productivity (air intake), m ³ / hour VO-7.1 with inertial blinds VO-7.1 with the Module 10 676 0 twenty 770 0 thirty 874 0 40 943 0 fifty 978 110 60 1012 270

Assessment of tightness when the fan is off and different vacuum values in the room

It should be noted that at a vacuum of 40 Pa, about a thousand cubic meters per hour of air enters through an inertial shutter fan, which is about 10% of the fan capacity and significantly violates the operation of the supply and exhaust ventilation.

In a fan with an installed thermal protection module, this leakage is practically absent. Cold air in the winter is excluded from the bird.

Table 3 Vacuum in the chamber, Pa Fan speed% VO-7.1 with inertial blinds VO-7.1 with the Module 10 21 44

Evaluation of work with a frequency converter

Table 3 shows the speed at which the fan starts to work on the hood. Up to this frequency threshold with a vacuum of 10 Pa, the operation of the fan only prevents the suction of air.

Claims (1)

Thermal protection module, comprising a body made in the form of a box and two flaps equipped with a closing spring, characterized in that the module casing is solid, with an inlet shape without sharp angles and module flaps made of polyurethane foam, aerodynamic shape, providing a snug fit to module housing.

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