RU228424U1 - Template for measuring air flow velocity in a ventilation opening - Google Patents

Abstract

The utility model relates to ventilation systems and can be used when conducting instrumental measurements of air flow rates in ventilation openings. The technical result from using the utility model consists in simplifying the process of determining the coordinates of points for measuring the air flow rate in a ventilation opening. The specified technical result is achieved in that the template for measuring the air flow rate in a ventilation opening contains a frame, along the entire length of each side of which through holes are made with no more than six branches each, in which a binding material is fixed with the possibility of its movement along the hole and fixation in the branches of the hole, wherein three branches on each hole are made at a distance of no more than 10 mm from each other and no more than 25 mm from the nearest edge of the hole and three at a distance of no less than 40 mm and no more than 50 mm from each other, wherein the branches are made in pairs and symmetrically relative to the sides of the frame.

Description

The utility model relates to ventilation systems and can be used when conducting instrumental measurements of air flow rates in ventilation openings.

The coordinates of the points for measuring the air flow speeds in the ventilation openings and their number are determined by the shape and dimensions of the measured cross-section of the air ducts. Measuring the air flow speed in the ventilation openings is one of the necessary points for assessing the efficiency of ventilation systems. This method identifies the flow of the required amount of air to the consumer. Commissioning and verification of compliance with the declared characteristics of the flow speeds in the ventilation openings are carried out. Currently, air flow speeds in the ventilation openings are measured using hand-held measuring instruments. This increases the time required to prepare for testing and complicates the measurement process. Therefore, creating a template is relevant.

A marking device is known (patent RU 83130 U1, published 20.05.2009). The device is a disposable marking tool containing a flexible adhesive tape with technological markings made on it, wherein the adhesive tape is provided with contrasting divisions made with a centimeter and/or inch step, and the technological markings are located in the center along the length of the adhesive tape and are made in the form of a dotted line or in the form of alternating X-shaped and O-shaped marks with a step of at least 5 mm.

This device cannot be used to measure air flow rates in ventilation openings due to the fact that it is impossible to securely fix the flexible adhesive tape in the ventilation openings, which makes it difficult to carry out measurements.

A universal welding template is known (patent RU 195821 U1, published 06.02.2020), which contains two shelves forming a square, the internal angle of which is 90°; the first shelf contains external and internal support surfaces located parallel to each other, as well as side surfaces that meet the support surfaces along their long sides and are located perpendicular to the support surfaces; the second shelf contains external and internal measuring surfaces located parallel to each other, as well as side surfaces that meet the measuring surfaces along their long sides and are located perpendicular to the measuring surfaces; the internal angle of the square is formed by the internal support surface of the first shelf and the internal measuring surface of the second shelf; the thickness of the first shelf, corresponding to the distance between the side surfaces of the first shelf, exceeds the thickness of the second shelf, corresponding to the distance between the side surfaces of the second shelf, wherein the shelves are connected in such a way that the side surfaces of the second shelf are located between planes passing through the side surfaces of the first shelf; the width of the first shelf, corresponding to the distance between its support surfaces, is 28 mm, and the width of the second shelf, corresponding to the distance between its measuring surfaces, is 22 mm; on the side of the outer measuring surface of the second shelf, an additional element is made in the form of a protrusion located opposite to the first shelf, wherein the surface of the protrusion on the side of the outer support surface of the first shelf is located closer to the plane of the inner support surface of the first shelf than the above-mentioned outer support surface; the length of the protrusion is at least 30 mm.

This device cannot be used to measure air flow speeds in ventilation openings because the template consists of two shelves forming a square, the internal angle of which is 90°. The device is designed to perform control and measuring operations during welding on rails, determines permissible deviations of the weld seam flow axis, determines the permissible welding gap and therefore cannot be used to measure air flow speeds in ventilation openings.

Currently, air flow velocities in ventilation openings are measured in accordance with paragraphs 10.4.1-10.4.3 of GOST 34060-2017. The coordinates of the points of measurement of air flow velocities in ventilation openings are determined in accordance with paragraph 1.3 of Fig. 2 of GOST 12.3.018-79 using manual measuring instruments (tape measure, ruler, etc.) each time measurements are taken. This significantly complicates the measurement process and increases the time required to conduct tests.

As a result of the conducted information search, the closest analogue was not found.

The technical problem solved by the proposed utility model is the creation of a template for measuring the air flow speed in a ventilation opening.

The technical result of using the utility model consists in simplifying the process of determining the coordinates of points for measuring the air flow velocity in the ventilation opening.

The specified technical result is achieved in that the template for measuring the air flow speed in the ventilation opening contains a frame, along the entire length of each side of which through holes are made with no more than six branches each, in which a binding material is fixed with the possibility of its movement along the hole and fixation in the branches of the hole, wherein three branches on each hole are made at a distance of no more than 10 mm from each other and no more than 25 mm from the nearest edge of the hole and three at a distance of no less than 40 mm and no more than 50 mm from each other, wherein the branches are made in pairs and symmetrically relative to the sides of the frame.

The essence of the utility model is explained in Fig. 1, 2.

The device consists of a square frame (1) no more than 200 mm long and wide and no more than 1.2 mm thick. The body (1) is made in the form of a frame made of any durable material, such as steel no more than 20 mm wide. Along the perimeter of the frame (1) there are through holes (2-5) no more than 190 mm long and no more than 4 mm wide. The through holes (2-5) are made so that on each side of the frame there are no more than six branches (6-29) no more than 4 mm wide. The branches (6-29) are L-shaped, located on the outer edge of the frame and perpendicular to the holes (2-5). Moreover, three branches are made at a distance of no more than 10 mm from each other and no more than 25 mm from the nearest edge of the hole, and three subsequent branches at a distance of no less than 40 mm and no more than 50 mm from each other, and the branches (6-29) are made in pairs and symmetrically relative to the sides of the body. In the branches, using any connections (30-37) with diameters of no more than M4, allowing movement along the holes (2-5) and fixation in the branches (6-29), for example, a bolted connection and nuts, any soft binding material (38-41), for example, a fishing line, is fixed.

The template for measuring the air flow velocity in the ventilation opening works as follows.

In the measured section of the ventilation opening, in which it is necessary to determine the air flow speed, the template is placed strictly in the center of the ventilation duct. The binding material (38-41), secured with connections (30-37), is moved along the holes (2-5) located in the frame (1), fixed in the branches (6-29) in accordance with the size of the ventilation opening.

The anemometer is placed in turn at each of the intersection points of the binding material (38-41). Measurements are taken. In the case of taking measurements in a ventilation opening of a different size, the binding material (38-41) is moved along the through holes (2-5) on the body (1) and fixed in the branches (6-29) in accordance with the size of the ventilation opening according to paragraph 1.3. fig. 2 of GOST 12.3.018-79.

It is possible to carry out measurements in ventilation openings of the following sizes:

100×100 mm, moving the connections (30-37) of the binding material (38-41) to the branches (8,11,14,17,18,21,24,27);

100×150 mm, moving the connections (30-37) of the binding material (38-41) to the branches (8,11,13,16,18, 21,25,28);

100×200 mm, moving the connections (30-37) of the binding material (38-41) to the branches (8,11,12,15,18,21,26, 29);

150×200 mm, moving the connections (30-37) of the binding material (38-41) to the branches (7,10,13,16,19,22,25,28);

200x200 mm, moving the connections (30-37) of the binding material (38-41) to the branches (6,9,12,15,20,23,26,29).

Thus, the proposed utility model of a template for measuring the air flow velocity in a ventilation opening allows to simplify the process of determining the coordinates of the points for taking measurements due to the fact that it eliminates the use of an additional hand tool, which reduces labor and time costs. The specified frequency of the location of the branches of the through holes, made in pairs and symmetrically on each side of the frame, allow fixing the binding material in such a way that the places of its intersection are the exact location of the points for measuring the air flow velocity in the ventilation openings in accordance with paragraph 1.3. Fig. 2 of GOST 12.3.018-79. The connections of the binding material to the frame, allowing it to move along the entire length of the through holes and fix it in the corresponding branches, allow using the template for ventilation openings of different sizes.

Claims (1)

A template for measuring the air flow rate in a ventilation opening, comprising a frame, along the entire length of each side of which through holes are made with no more than six branches each, in which a binding material is fixed with the possibility of its movement along the hole and fixation in the branches of the hole, wherein three branches on each hole are made at a distance of no more than 10 mm from each other and no more than 25 mm from the nearest edge of the hole and three at a distance of no less than 40 mm and no more than 50 mm from each other, wherein the branches are made in pairs and symmetrically relative to the sides of the frame.

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