CN218763822U

CN218763822U - Air volume adjusting device for exhaust pipe and exhaust pipe network system thereof

Info

Publication number: CN218763822U
Application number: CN202222712395.0U
Authority: CN
Inventors: 张伯华
Original assignee: Langfang Jindun Huatong Technology Co ltd
Current assignee: Langfang Jindun Huatong Technology Co ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-03-28
Anticipated expiration: 2032-10-14

Abstract

The utility model discloses an air regulation device for blast pipe, it includes the barrel and locates grid rectifier, orifice plate and air regulation valve in the barrel to an include air regulation device's the blast pipe network system of multi-storey building that is used for. According to the utility model discloses an air regulation device overall structure for blast pipe is compact, can still keep higher flow measurement precision under showing the condition that reduces device length, and include air regulation device's blast pipe network system can make each layer of multilayer building arrange into the amount of wind of exhaust passage shaft roughly the same, has effectively solved the less unable exhaust even of bottom amount of wind and has taken place the problem that the flue gas flows backward.

Description

Air volume adjusting device for exhaust pipe and exhaust pipe network system thereof

Technical Field

The utility model relates to an air regulation device of blast pipe and including this air regulation device's blast pipe network system for multi-storey building.

Background

In modern high-rise houses, exhaust gas (such as kitchen fumes and toilet exhaust gas) at each floor is generally discharged to an exhaust duct shaft by using an exhaust device such as a range hood or an exhaust fan, and then is intensively discharged to the environment above a building through the exhaust duct shaft, so that the exhaust device and the exhaust duct shaft at each floor form an exhaust duct network system of a multi-power source. Generally, the exhaust capacities of the range hoods and/or exhaust fans of users on each floor are substantially the same, so that when the users on each floor exhaust simultaneously, the air volume which can be exhausted by the users on the lower floor is smaller, and therefore, the situation that the exhaust volume of the users on the upper floor is large and the exhaust volume of the users on the lower floor is small is easy to occur, and even the phenomenon that smoke flows backwards due to the fact that the users on the bottom floor cannot exhaust oil smoke or waste gas occurs.

Therefore, there is still a need to provide an air volume adjusting device for an exhaust pipe capable of solving the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an air volume adjusting device. Particularly, the utility model provides the following technical scheme.

In one aspect, the utility model provides an air regulation device for blast pipe, include the barrel and locate grid rectifier, orifice plate and air regulation valve in the barrel, wherein the one end as the air intake of barrel is located to the grid rectifier, air regulation valve locates the other end as the air outlet of barrel, the middle part of barrel is located to the orifice plate, is equipped with the upper reaches on the barrel lateral wall between grid rectifier and orifice plate and fetches pressure the hole, is equipped with the low reaches on the barrel lateral wall between orifice plate and air regulation valve and fetches pressure the hole.

Further, the length of the grid rectifier in the axial direction of the barrel is at least 30%, such as at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 100%, at least 120%, etc., of the inner diameter of the barrel. A longer grid rectifier can obtain a better rectification effect, so that the airflow passing through the upstream pressure tapping hole, the pore plate and the downstream pressure tapping hole is more stable, and more accurate differential pressure and flow measurement results are obtained; however, too long a grid rectifier can also result in larger device size and weight. Preferably, the length of the grid rectifier in the axial direction of the cylinder is 30-70%, such as 40-60%, about 50%, etc. of the inner diameter of the cylinder.

Further, the distance between the downstream end face of the grid rectifier and the upstream pressure taking hole is at least 30% of the inner diameter of the cylinder, such as at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 100%, at least 120%, etc. The distance between the downstream end face of the grid rectifier and the upstream pressure taking hole is properly increased, so that the airflow passing through the upstream pressure taking hole, the orifice plate and the downstream pressure taking hole is more stable, and more accurate differential pressure and flow measurement results are obtained; however, this increase in distance also results in greater device size and weight. Preferably, the distance between the downstream end face of the grid rectifier and the upstream pressure taking hole is 30-70% of the inner diameter of the cylinder, such as 40-60%, about 50% and the like.

Further, the grid rectifier is composed of a plurality of guide vanes parallel to the axial direction of the cylinder, and the density of the guide vanes close to the side wall of the cylinder is greater than or equal to that of the guide vanes close to the axial direction of the cylinder. The density of the flow deflectors is properly increased, so that a shorter grid rectifier is adopted, the size of equipment is reduced, and a better rectification effect is generated; however, increasing the density of the guide vanes also results in greater equipment weight and may increase head loss. Preferably the density of the baffles near the barrel sidewall is 100-500%, such as 150%, 200%, 250%, 300%, 350%, 400%, 450%, etc. of the density of the baffles near the barrel axis.

Further, the distance between the air volume adjusting valve and the downstream pressure taking hole is at least 50% of the inner diameter of the cylinder. The distance between the air volume regulating valve and the downstream pressure tapping hole is properly increased, so that the disturbance of the air volume regulating valve on air flow passing through the upstream pressure tapping hole, the pore plate and the downstream pressure tapping hole can be reduced, and more accurate pressure difference and flow measurement results can be obtained; however, this increase in distance also results in greater device size and weight. Preferably, the distance between the air volume adjusting valve and the downstream pressure taking hole is 50-80% of the inner diameter of the cylinder, such as 50-70%, about 50%, about 60% and the like.

Further, the air volume adjusting valve can be any suitable valve system capable of adjusting air volume, and the air volume adjusting valve is provided with a display device for displaying flow or valve plate position. For example, the air volume adjusting valve may be a butterfly valve having an adjusting handle, a scale for marking the position of the adjusting handle is provided at the adjusting handle of the butterfly valve, and the unit of the scale may be any suitable unit such as an angle between a valve plate of the butterfly valve and an axis of the cylinder, an air volume value in a standard state, or a percentage equivalent to a maximum air volume.

Furthermore, at least 2 upstream pressure sampling holes are formed and are communicated with a high-pressure interface of the differential pressure gauge after being communicated with each other through pressure sampling pipes; the downstream pressure sampling holes are at least 2 and are communicated with a low-pressure interface of the differential pressure gauge after being communicated with each other by pressure sampling pipes. The differential pressure gauge can be a digital display or pointer type differential pressure gauge. Increasing the number of pressure taps is beneficial in obtaining more accurate pressure differentials and flow measurements, and may advantageously reduce the risk of the pressure taps becoming clogged with contaminants in the gas stream.

Further, the air volume adjusting device comprises a nameplate for recording a relational formula, a curve or a table of the pore plate pressure difference delta P and the air volume Q, wherein formula parameters, curves or data calibrated on a standard air volume experiment table are given, and the formula is in the following form: q = A (Δ P) ^x And the specific numerical values of A and x are obtained by calibrating a standard air volume experiment table. In some cases, the specific air quantity data Q can also be marked directly on the corresponding scale on the dial of the differential pressure meter.

Further, the upstream pressure taking holes and the downstream pressure taking holes may be each independently 3, 4, 5, 6, 8, etc. each disposed on the same cross section perpendicular to the cylinder axis in a uniform or non-uniform manner, respectively, wherein the number of pressure taking holes disposed on the upper half of the cylinder is larger than the number of pressure taking holes disposed on the lower half of the cylinder in a non-uniform manner, for example: the number of the upper half parts is 2, and the number of the lower half parts is 1; the number of the upper half parts is 3, and the number of the lower half parts is 1 or 2; the number of the upper half parts is 4, and the number of the lower half parts is 1, 2 or 3; the number of the upper half parts is 5, and the number of the lower half parts is 1, 2, 3 or 4. The non-uniform mode is provided with more pressure taking holes at the upper half part of the cylinder body, so that the problem that pressure difference and flow cannot be effectively measured due to the fact that all the pressure taking holes are blocked by pollutants such as oil drops in air flow can be further avoided.

In another aspect, the present invention also provides an exhaust duct network system for a multi-storey building, wherein an air volume adjusting device for an exhaust duct according to any one of the above items is provided in an exhaust duct of an exhaust duct shaft and an exhaust duct of an exhaust communicating device of each storey in the multi-storey building, wherein the air volume adjusting device of adjacent two storeys is set so that the air volume of the upper layer entering the exhaust duct shaft is approximately equal to the air volume of the lower layer entering the exhaust duct shaft.

Further, the difference between the air volume entering the exhaust duct shaft of the upper layer and the air volume entering the exhaust duct shaft of the lower layer is at most ± 50%, such as at most ± 40%, at most ± 30%, at most ± 20%, at most ± 10%, at most ± 5%, at most ± 3%, at most ± 2%, at most ± 1%.

Further, the exhaust device comprises a range hood and/or an exhaust fan.

The total pressure drop required to be overcome by each layer of exhaust device comprises the pressure drop generated by the air volume adjusting device and the pressure drop generated by the part of the exhaust passage vertical shaft between the air inlet of the layer and the air outlet of the exhaust passage vertical shaft usually arranged at the top of the building, and the pressure drop generated by the part of the exhaust passage vertical shaft not only comprises the pressure drop generated by the exhaust passage vertical shaft per se but also comprises the pressure drop generated by the air volume exhausted into the exhaust passage vertical shaft at each layer above the layer; the lower the level, the greater the pressure drop created by the stack shaft section. Generally speaking, the aperture of the air volume adjusting valve in the upper air volume adjusting device is smaller than that of the lower air volume adjusting device in the air volume adjusting valve, so that the pressure drop brought by the upper air volume adjusting device is properly increased, the total pressure drop required to be overcome by the upper exhaust device is approximately the same as that required to be overcome by the lower exhaust device, the air volume exhausted into the exhaust passage shaft of each layer is approximately the same, and the problem of smoke backflow caused by small air volume of the lower layer or the bottom layer or even incapability of exhausting is effectively solved.

In the description of the present invention, "substantially" does not exclude the meaning of "completely". For example, a component "substantially free" of Y may also be completely free of Y. "substantially" may be deleted from the definition of the invention if desired. "comprising" includes both the recited factors and also allows for the inclusion of additional, non-deterministic factors. "about", "left or right" and the like refer to +/-5%, +/-4%, +/-3%, +/-2%, +/-1%, +/-0.5% of the standard value, where the concentrations of the components are indicated. "and/or" means that the plurality of terms connected thereby can be used individually or in any combination with each other.

In the present invention, examples are generally described in a certain range, which is only for the purpose of concise and clear explanation, but not for the limitation of the present invention. The ranges recited include sub-ranges as well as all individual values within the range. For example, a range of 1 to 6 includes subranges such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, and the like, as well as individual values within the range, such as 1, 2, 3, 4, 5, 6.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Drawings

Fig. 1 is a schematic perspective view of an air volume adjusting device according to an embodiment of the present invention;

fig. 2 is a sectional view showing a three-dimensional structure of the air quantity adjusting device shown in fig. 1;

fig. 3 is a schematic perspective view of an air volume adjusting device according to another embodiment of the present invention;

in the figure: 1-a cylinder body; 10-well plate; 11-a grid rectifier; 12-a butterfly valve; 13-a handle; 14-a pointer; 15-graduation; 16-upstream pressure tapping; 17-downstream pressure tapping; 21-upstream pressure tapping pipe; 22-a downstream pressure tapping pipe; 23-differential pressure gauge.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-2, an aspect of the present invention provides an air volume adjusting device for an exhaust pipe of a multi-story building, which includes a barrel 1 and a grid rectifier 11, a hole plate 10 and a butterfly valve 12 which are arranged in the barrel 1, wherein the grid rectifier 11 is arranged at one end of the barrel 1 as an air inlet, the butterfly valve 12 is arranged at the other end of the barrel 1 as an air outlet, the hole plate 10 is arranged at the middle of the barrel 1, an upstream pressure tapping hole 16 is arranged on a barrel side wall between the grid rectifier 11 and the hole plate 10, and a downstream pressure tapping hole 17 is arranged on a barrel side wall between the hole plate 10 and the butterfly valve.

In a preferred embodiment, the cylinder 1 has an inner diameter of 160mm and a length of 600mm; the length of the grid rectifier 10 in the axial direction of the cylinder 1 is 80mm, and the size of each grid is 20mm × 20mm. The distance between the downstream end face of the grid rectifier 10 and the upstream pressure taking hole 16 is 80mm. The inner diameter of the orifice plate 10 is 125mm. The distance between the upstream pressure tapping hole 16 and the orifice plate 10 is 160mm. The distance between the orifice plate 10 and the butterfly valve 12 is 80mm.

The grid rectifier 11 is composed of a plurality of flow deflectors parallel to the axial direction of the cylinder 1 and close to the side wall of the cylinder 1The density of the flow deflector is larger than or equal to that of the flow deflector near the axis of the cylinder body 1, and the density of the flow deflector is the length value of the section of the flow deflector on the unit sectional area vertical to the axial direction of the cylinder body 1. For example, in the grid rectifier 11 shown in fig. 1, when exactly one complete 20mm × 20mm square is formed by the guide vanes in a unit cross-sectional area of 20mm × 20mm perpendicular to the axial direction of the cylinder 1, the average density of the guide vanes is: 80mm/400mm ² 。

The air volume adjusting valve is a butterfly valve, and scales for marking the position of the adjusting handle are arranged at the adjusting handle of the butterfly valve.

The number of the upstream pressure taking holes is 4, and the upstream pressure taking holes are communicated with a high-pressure interface of the differential pressure gauge after being communicated with each other by pressure taking pipes; the downstream pressure sampling holes are 4 and are communicated with a low-pressure interface of the differential pressure gauge after being communicated with each other by pressure sampling pipes. The differential pressure gauge can be a digital display or pointer type differential pressure gauge. The diameters of the pressure taking holes are all 3mm. The end part of the pressure taking hole facing the inside of the cylinder is flush with the inner wall of the cylinder, and the end part and the surface of the adjacent inner wall of the cylinder are smooth and have no burrs or depressions, so that pressure fluctuation caused by air flow disturbance is avoided. Through setting up a plurality of pressure taking holes, can survey the pressure differential around the orifice plate more accurately on the one hand, on the other hand can effectively avoid in the flue gas pollutant to block up pressure taking hole and lead to the problem of unable survey orifice plate front and back pressure differential.

Example 2

As shown in fig. 3, an annular grille shutter rectifier is used in an air volume adjusting device according to another embodiment of the present invention, and the rest is the same as in example 1. In the annular grid rectifier, the flow deflectors are arranged near the inner wall of the cylinder body 1, and the part near the axis of the cylinder body is not provided with the flow deflectors, so that the number of the flow deflectors is effectively reduced, the weight and the materials of the whole device are reduced, and the rectifying effect is not obviously influenced.

Example 3

In an exhaust duct network system in a multi-story building, the air volume adjusting devices for exhaust ducts according to embodiment 1 or 2 are provided in an exhaust duct communicating an exhaust port of a range hood or an exhaust fan and an exhaust duct shaft on each floor, and then the air volume adjusting valves of the air volume adjusting devices on each floor are adjusted respectively, so that the air volume entering the exhaust duct shaft on the upper floor is approximately equal to the air volume entering the exhaust duct shaft on the lower floor by setting the air volume adjusting devices on the adjacent two floors. For example, the difference between the air flow into the exhaust duct shaft in the upper level and the air flow into the exhaust duct shaft in the lower level is at most ± 50%.

According to the utility model discloses an integrated orifice plate flowmeter and butterfly valve among the air regulation device for blast pipe to setting up the grid rectifier in air intake department, consequently overall structure is compact, can still keep higher flow measurement precision under showing the condition that reduces device length. Meanwhile, the exhaust pipe network system comprising the air volume adjusting device can enable the air volume exhausted into the exhaust pipe shaft at each layer of the multi-layer building to be approximately the same, and effectively solves the problem that smoke flows backwards due to the fact that the air volume at the bottom layer is small or even exhaust cannot be conducted.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides an air regulation device for blast pipe, its characterized in that includes the barrel and locates grid rectifier, orifice plate and the air regulation valve in the barrel, wherein the one end as the air intake of barrel is located to the grid rectifier, the other end as the air outlet of barrel is located to the air regulation valve, the middle part of barrel is located to the orifice plate, is equipped with the upper reaches on the barrel lateral wall between grid rectifier and orifice plate and fetches pressure the hole, is equipped with the low reaches on the barrel lateral wall between orifice plate and air regulation valve and fetches pressure the hole.

2. The air volume adjusting device for an exhaust pipe according to claim 1, wherein the length of the grille shutter in the axial direction of the can is at least 30% of the inner diameter of the can.

3. The air volume adjusting device for the exhaust pipe according to claim 1 or 2, wherein a distance between the downstream end face of the grille shutter and the upstream pressure-taking hole is at least 30% of an inner diameter of the cylindrical body, and/or a distance between the air volume adjusting valve and the downstream pressure-taking hole is at least 50% of the inner diameter of the cylindrical body.

4. The air quantity adjusting apparatus for an exhaust pipe according to claim 1 or 2, wherein the grille shutter is constituted by a plurality of guide vanes parallel to the axial direction of the can, and the density of the guide vanes near the side wall of the can is greater than or equal to that of the guide vanes near the axial direction of the can.

5. The air volume adjusting device for an exhaust pipe according to claim 1 or 2, wherein the upstream pressure-taking hole and the downstream pressure-taking hole are each independently at least 3, 4, 5, 6, 8 or more, each of which is respectively provided in a uniform or non-uniform manner on the same cross section perpendicular to a barrel axis.

6. The air volume adjusting device for the exhaust pipe according to claim 5, wherein the upstream pressure taking holes are communicated with a high-pressure interface of a differential pressure gauge after being communicated with each other by a pressure taking pipe; and the downstream pressure-taking holes are communicated with a low-pressure interface of the differential pressure gauge after being communicated with each other through pressure-taking pipes.

7. The air volume adjusting device for an exhaust pipe according to claim 1 or 2, wherein the air volume adjusting valve is a butterfly valve, and a scale for marking the position of the adjusting handle is provided at the adjusting handle of the butterfly valve.

8. An exhaust stack network system for a multi-story building, characterized in that an air volume adjusting device for an exhaust stack according to any one of claims 1 to 7 is provided in an exhaust stack of each story, which communicates an exhaust port of an exhaust stack and an exhaust stack shaft, wherein the air volume adjusting devices of adjacent two stories are disposed so that an air volume entering the exhaust stack shaft of an upper story is substantially the same as an air volume entering the exhaust stack shaft of a lower story.

9. The exhaust duct network system for multi-story building of claim 8, wherein the difference between the air volume of the upper-story exhaust duct shaft entering the exhaust duct shaft and the air volume of the lower-story exhaust duct shaft is at most ± 50%.

10. The exhaust duct network system for the multistorey building according to claim 8 or 9, wherein the exhaust means includes a hood and/or an exhaust fan.