RU2808073C1 - Air flow stabilizer - Google Patents

Abstract

FIELD: natural exhaust ventilation.

SUBSTANCE: stabilizer refers to ventilation systems for buildings for various purposes, in particular to natural exhaust ventilation. The air flow stabilizer contains a housing 1, a diaphragm 2 fixed in the housing, a plunger 3 that perceives the pressure of the air flow, mounted on an axis 4, with limiters 5 at one end and at the other end, moving back and forth in bushings 6 mounted on racks 7-1, 7-2, one of the racks 7-1 is fixed in the housing 1, the stabilizer is equipped with a sequence of elastic rods 8-1… 8-3 with given linear stiffness characteristics, each rod can touch the protrusion 9 on the axis 4 when it moves. A smoothly tapering channel 10 is attached to the housing 1, a smoothly expanding channel 11 is attached to the diaphragm 2. Another rack 7-2 is fixed in a smoothly expanding channel 11. The other ends of each elastic rod (8-1… 8-3) is fixed in a smoothly expanding channel 11.

EFFECT: eliminating the spatial orientation of the air flow stabilizer, the ability to be built into channels without protruding parts, the ability to operate without an external energy source, the presence of a composite elastic element that meets the required stiffness characteristic, and is more sensitive to the low speed of the oncoming air flow.

1 cl, 1 dwg

Description

The stabilizer refers to ventilation systems for buildings for various purposes, and in particular to natural exhaust ventilation.

A device for stabilizing air flow is known, containing a housing with a control valve in the form of a cylinder with slots in the side surface and a plunger with a movement limiter installed in the cylinder with the possibility of reciprocating movement. The plunger perceives the pressure of the air flow, under the influence of which it moves in the cylinder. The cylinder is mounted on a diaphragm fixedly fixed to the body. The elastic element is fixed at one end to the plunger, and the other to the tension adjustment screw installed on the stand. The tension screw regulates the required tension of the elastic element (RF patent No. 2547602, publ. 04/10/2015).

The disadvantage of this invention is the difficulty in developing and manufacturing an elastic element with a predetermined nonlinear stiffness characteristic that exactly corresponds to the changing influence of the air flow.

The closest in its technical essence is an air flow stabilizer containing a housing, a diaphragm fixed in the housing and a plunger mounted on an axis with limiters and with a protrusion, which has the ability to move reciprocatingly in bushings mounted on racks fixed in the housing, the stabilizer is equipped with a sequence elastic rods with specified stiffness characteristics, one end of each elastic rod is fixed to the body, and on the opposite side it can touch the protrusion on the axis when it moves (RF patent No. 2773592, publ. 06.06.2022).

The disadvantage of this invention is its low sensitivity to the effects of air flow at low speeds, especially characteristic of natural ventilation systems.

The objective of the invention is to design an air flow stabilizer that can operate in any spatial orientation; can be built into channels without protruding parts; works without the use of an external energy source; contains an elastic element that meets the required stiffness characteristics and is more sensitive to the low speed of the oncoming air flow.

The technical result is the use of a smoothly tapering channel on the side where the air flow enters the stabilizer housing, and the use of a smoothly expanding channel at the exit of the air flow from the diaphragm. This shape of the flow part of the stabilizer makes it possible to create an increased air flow speed in the narrowed part of the stabilizer, where the plunger moves, compared to the speed at the entrance to the device. At the same time, a smooth narrowing of the body, and then a smooth expansion, reduces the initial aerodynamic resistance of the device, expanding the possible range of its application. And also the exclusion of spatial orientation of the air flow stabilizer, operation without an external energy source, the possibility of being built into channels without protruding parts of the device, the presence of a composite elastic element that provides the required characteristic of the rigidity of the elastic element.

The result is achieved by the fact that in an air flow stabilizer containing a housing, a diaphragm fixed in the housing, a plunger mounted on an axis with limiters and a protrusion, which has the ability to move reciprocatingly in bushings mounted on racks, one rack is fixed in the housing, the stabilizer is equipped with a sequence elastic rods with specified stiffness characteristics, one end of each elastic rod can touch the protrusion on the axis when it moves, a smoothly tapering channel is attached to the body, a smoothly expanding channel is attached to the diaphragm, the other post is fixed in a smoothly expanding channel, each elastic rod is fixed on the opposite side in a smoothly expanding channel.

The drawing schematically shows the design of the proposed stabilizer. The air flow stabilizer contains a housing 1, a diaphragm 2 fixed in the housing, a plunger 3 that perceives the pressure of the air flow, mounted on an axis 4, with limiters 5 at one end and at the other end, moving back and forth in bushings 6 mounted on racks 7 -1.7-2, one of the racks 7-1 is fixed in housing 1, the stabilizer is equipped with a sequence of elastic rods 8-1 ... 8-3 (may consist of another number of elastic rods, there are 3 of them shown in the figure) with given linear stiffness characteristics , each rod can touch the protrusion 9 on the axis 4 when it moves. A smoothly tapering channel 10 is attached to the body 1, a smoothly expanding channel 11 is attached to the diaphragm 2. Another rack 7-2 is fixed in a smoothly expanding channel 11. The other ends of each elastic rod (8-1 ... 8-3) are fixed in a smoothly expanding channel 11 .

The air flow stabilizer works as follows.

The air flow passes through a smoothly tapering channel 10, increases the speed and velocity pressure on the plunger 3. At the calculated air flow rate, the velocity pressure of the air flow acting on the plunger 3 is compensated by the initial tension of the first elastic rod 8-1 in the sequence. The plunger 3 is in the calculated extreme position, maximally opening the passage for air in the space between itself, the housing 1 and the diaphragm 2 for the passage of the calculated air flow. With increasing air flow, the air flow pressure acting on the plunger 3 increases; it moves along with the axis 4 along the body 1, reducing the air passage area in this space (increasing resistance), which reduces the air flow, returning it to a value close to the calculated one expense. When the plunger 3 moves together with the axis 4 in the bushings 6, the protrusion 9 will stretch (bend) the rod 8-1 with less rigidity until this rod 8-1 stretches to the calculated position. This position is determined by the vertical position of rod 8-2. A further increase in the air flow pressure and the corresponding movement of the plunger with the axis and the lock will stretch the rods 8-1 and 8-2, which have greater rigidity. In this case, there is a further reduction in the air passage area between the plunger housing and the diaphragm, which returns the air flow to the calculated value. With a further increase in pressure, the plunger moves, stretching the sequence of elastic rods, reaching the extreme position corresponding to the calculated stretch of all elastic rods. The movement of the plunger with the axis in the housing is limited by the positions of the limiters 5. The constancy of the stabilized air flow is achieved by the correct (calculated) choice of the rigidities of the elastic rods 8-1...8-3 and the places where they are fixed on the smoothly expanding channel 11. When the air flow pressure decreases, the stabilizer operates in in reverse order: the elastic rods are compressed (unbent), transferring their impact to protrusion 9 and moving the axis with the plunger, opening a larger area for air passage, reducing the resistance of the stabilizer and returning the air flow to the calculated value. Due to the smoothly tapering channel 10, the speed and velocity pressure acting on the plunger increases, compared to the lower speed and velocity pressure at the entrance to the stabilizer - the sensitivity of the device increases. The smoothly tapering channel 10 and the smoothly expanding channel 11 reduce pressure losses in the stabilizer at the design air flow.

The proposed design of the air flow stabilizer achieves its goals: the design does not require a specific spatial orientation; provides the ability to be built into channels without protruding parts; ensures operation of the stabilizer without an external energy source; contains a composite elastic element that meets the required stiffness characteristics; is more sensitive to low speed of incoming air flow.

Claims (1)

An air flow stabilizer containing a housing, a diaphragm fixed in the housing, a plunger, mounted on an axis with limiters and a protrusion, capable of moving back and forth in bushings mounted on racks, one rack is fixed in the housing, the stabilizer is equipped with a sequence of elastic rods with given characteristics rigidity, one end of each elastic rod can touch the protrusion on the axis when it moves, characterized in that a smoothly tapering channel is attached to the body, a smoothly expanding channel is attached to the diaphragm, the other stand is fixed in a smoothly expanding channel, each elastic rod on the opposite side is fixed in a smoothly expanding channel.