A new and efficient ventilation system pipeline resistance balancing device

Abstract

The present invention discloses a novel and efficient ventilation system pipeline resistance balancing device, which relates to the field of pipeline adjustment equipment. The present invention comprises a shell pipe, which is connected to the ventilation system pipeline, a fixed ring is coaxially arranged in the shell pipe, and an inner tube is coaxially installed on the inner ring of the fixed ring, so as to achieve the purpose of adjusting the pipeline resistance conveniently and efficiently.

Description

Technical Field

[0001] The invention relates to the field of pipeline regulating equipment, in particular to a novel and efficient ventilation system pipeline resistance balancing device. Background Art

[0002] The ventilation system of a centralized dust removal system often contains dozens or even hundreds of dust hoods. The pipe network is in a branched shape, with a large number of branches, and parallel pipes are formed between the branches. When designing the pipe network, the air volume and resistance balance calculation should be done, that is, the air volume allocated to each branch is consistent with the designed air volume, the fluid flow resistance and resistance loss between the parallel branches are basically equal, and the relative difference in the resistance loss calculation value should not exceed 10%. Otherwise, the dust removal system will have many problems or even lose its function, mainly manifested in:

[0003] 1. The air volume of some dust hoods is too small to achieve the dust source control effect;

[0004] 2. The air volume of some dust hoods is too large, and a large amount of materials are sucked away;

[0005] 3. The wind speed of some branch pipes is too low, and dust settles in the pipes, causing pipe blockage;

[0006] 4. The wind speed in some branch pipes is too high, causing serious wear on the pipes.

[0007] It can be seen that it is very important to ensure the air volume distribution and resistance balance of parallel pipelines. The so-called resistance balance is actually a measure to add fluid damping elements to the branch with the smallest calculated resistance value in the parallel pipeline. Common damping elements include regulating valves.

[0008] By adjusting the valve opening to change the flow resistance of the branch, resistance balance can be achieved. This method can be used on branches with smaller pipe diameters. However, it is not suitable when the branch pipe diameter is large. The main reasons are:

[0009] 1. Large-caliber valves are operated electrically or pneumatically, and are more expensive;

[0010] 2. The valve is only operated during the commissioning of the dust removal system. Once the commissioning is completed, it is basically no longer operated and the utilization rate is very low;

[0011] 3. The regulating valve usually adopts butterfly valve or plug valve, which has flow deviation phenomenon during use, and has serious wear and leakage;

[0012] 4. The regulating valve is not operated for a long time after commissioning, and cannot move due to rust or powder accumulation, which is useless;

[0013] 5. When the number of valves is large, the project investment increases significantly.

[0014] From this we can see that valves are not an ideal choice as fluid damping elements in dust removal pipelines. Summary of the invention

[0015] The purpose of the present invention is to provide a novel and efficient ventilation system pipeline resistance balancing device, so as to achieve the purpose of adjusting the pipeline resistance conveniently and efficiently.

[0016] In order to achieve the above-mentioned purpose, the present invention adopts the following technical means:

[0017] A novel and efficient ventilation system pipeline resistance balancing device comprises a shell tube, wherein the shell tube is connected with the ventilation system pipeline, a fixing ring is coaxially arranged in the shell tube, and an inner tube is coaxially mounted on the inner ring of the fixing ring.

[0018] Preferably, flanges for fixing to the ventilation system pipeline are coaxially mounted at both ends of the shell tube.

[0019] Furthermore, the side wall of the shell tube is provided with a mounting groove extending in a direction parallel to the axis of the shell tube, the fixing ring is in sliding contact with the inner wall of the shell tube, the outer edge of the fixing ring is provided with a cylindrical handle, the cylindrical handle passes through the mounting groove and extends out of the shell tube, the mounting groove includes a cylindrical groove for accommodating the cylindrical handle, both ends of the cylindrical groove parallel to the axis of the shell tube are respectively connected with through grooves, the distance between the ends of the through grooves at both ends of the cylindrical groove is the same as the outer diameter of the fixing ring, the width of the through groove is the same as the length of the inner tube, the outer diameter of the cylindrical handle is larger than the width of the through groove, and a sealing rubber ring is coaxially installed on the outer edge of the fixing ring.

[0020] Furthermore, the inner wall of the cylindrical groove is provided with an arc plate coaxially arranged therewith, the inner diameter of the arc plate is the same as the outer diameter of the cylindrical handle, the inner wall of the through groove is provided with a support plate connected to the arc plate and in the same plane, the support plate includes a first support plate connected to the arc plate, the first support plate is parallel to the axis of the shell tube, and the distance between the first support plates symmetrical about the axis of the shell tube is the same as the length of the inner tube, second support plates are provided at the upper and lower ends of the through groove, the distance between the second support plates is the same as the outer diameter of the fixing ring, a baffle is filled and installed in the mounting groove, the baffle fills the mounting groove and contacts the arc plate and the support plate, and a through channel for the cylindrical handle to pass through is provided on the baffle.

[0021] Furthermore, the upper and lower ends of the baffle are removably fixed to the second support plate by bolts, and a sealing rubber pad is installed on the side of the baffle facing the arc plate or the support plate, and the sealing rubber pad is in contact with the support plate and the arc plate.

[0022] Furthermore, when the axis of the fixing ring is in the same state as the axis of the shell tube, the upper and lower ends of the cylindrical handle along the axis of the shell tube are provided with limit grooves derived from the axis of the cylindrical handle, the end of the limit groove facing the fixing ring and the end of the baffle facing the fixing ring are arranged in the same plane, and the limit groove passes through the end of the cylindrical handle facing away from the fixing ring, and the upper and lower ends of the through channel are both equipped with limit blocks extending along the axis thereof, the limit block extends toward the side facing away from the fixing ring, and the limit block is slidably embedded in the limit groove.

[0023] Furthermore, a surface of the baffle facing away from the fixing ring protrudes from the outer wall of the shell tube.

[0024] During use, the present invention has the following beneficial effects:

[0025] The resistance balancing device is connected to the pipeline at a suitable position. The inner tube is installed in the center of the shell through a fixing ring. The inner diameter of the inner tube is determined according to the difference in resistance calculated at the nodes of the parallel pipelines, and has the following characteristics:

[0026] 1. Simple structure, easy to manufacture and install;

[0027] 2. When the fluid flows through the shell tube and the inner tube, it suddenly shrinks and expands, generating local resistance, and the resistance-increasing effect is obvious;

[0028] 3. Low cost and price, no need for electric or pneumatic control;

[0029] 4. Avoid fluid deviation phenomenon and have good wear resistance;

[0030] 5. Since the inner pipe diameter is determined by the resistance balance calculation of the pipe network system, it saves the tedious pipe network debugging workload compared to valve adjustment;

[0031] 6. Compared with valve adjustment, it saves the trouble of maintenance and setting up operating platform, thus saving investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention.

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0034] Figure 3 It is a schematic diagram of the structure in one embodiment of the present invention.

[0035] Figure 4 for Figure 3 Schematic diagram of the side structure.

[0036] Figure 5 for Figure 4Schematic diagram of the AA cross-section structure.

[0037] Figure 6 for Figure 3 Schematic diagram of the partially disassembled structure.

[0038] Figure 7 for Figure 6 Schematic diagram of the side view of the middle shell tube.

[0039] Figure 8 for Figure 7 Schematic diagram of the BB cross-section structure.

[0040] Fig. 9 It is a schematic diagram of the working principle of the present invention.

[0041] Among them, 1-shell tube, 2-fixing ring, 3-inner tube, 4-flange, 5-mounting groove, 51-cylindrical groove, 52-through groove, 6-cylindrical handle, 7-arc plate, 8-support plate, 81-first support plate, 82-second support plate, 9-baffle, 10-through channel, 11-limiting groove, 12-limiting block. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] For a specific description of the present invention, in one embodiment, please refer to Figure 1 as well as Figure 2 As shown, a novel and efficient ventilation system pipeline resistance balancing device comprises a shell tube 1, wherein the shell tube 1 is connected to the ventilation system pipeline, a fixing ring 2 is coaxially arranged inside the shell tube 1, and an inner tube 3 is coaxially installed on the inner ring of the fixing ring 2.

[0049] At the same time, flanges 4 for fixing to the ventilation system pipeline are coaxially mounted on both ends of the shell tube 1 .

[0050] That is to say, the shell tube 1 is connected to the pipeline through the flange 4 at a suitable position of the pipeline, and welding can also be used. The inner tube 3 is welded to the center of the shell through the fixing ring 2, and the inner diameter of the inner tube 3 is determined according to the difference in resistance calculated at the nodes of the parallel pipelines. It is not difficult to see that the present invention has the following characteristics:

[0051] 1. Simple structure, easy to manufacture and install;

[0052] 2. When the fluid flows through the shell tube 1 and the inner tube 3, it suddenly shrinks and expands, generating local resistance, and the resistance-increasing effect is obvious;

[0053] 3. Low cost and price, no need for electric or pneumatic control;

[0054] 4. Avoid fluid deviation phenomenon and have good wear resistance;

[0055] 5. Since the diameter of the inner pipe 3 is determined by the resistance balance calculation of the pipe network system, the tedious pipe network debugging workload is saved compared to the valve adjustment;

[0056] 6. Compared with valve adjustment, it saves the trouble of maintenance and setting up operating platform, thus saving investment.

[0057] More specifically, the present invention utilizes the throttling principle of the orifice plate to achieve the purpose of adjusting the pipeline resistance by generating local flow resistance.

[0058] The specific working principle of the present invention is as follows Fig. 9 As shown, the design of the present invention is essentially to calculate the cross-sectional area A2 of the inner tube 3 (or the inner diameter of the inner tube 3) by calculating the resistance coefficient of the balanced resistance device under the conditions that the pipeline cross-sectional area A1, the average wind speed v1 of the pipeline and the required resistance increase value ΔP are known.

[0059] The calculation formula for the local resistance coefficient of the resistance balance device design is:

[0060]

[0061] Where: ζ-----designed local resistance coefficient of resistance balance device;

[0062] ΔP-----Calculated difference of flow resistance of parallel pipeline nodes, Pa;

[0063] ρ-----medium density, Kg / m 3 ;

[0064] ν-----Flow rate of fluid in the branch where the resistance balancing device is located, m / s.

[0065] The above calculations can be used to obtain the design resistance coefficient of the balanced resistor. The cross-sectional area A2 of the inner tube 3 can be calculated using the following empirical formula:

[0066]

[0067] Where:

[0068] ζ----- Design local resistance coefficient of resistance balance device;

[0069] A1-----pipeline cross-sectional area, m2;

[0070] A2-----Cross-sectional area of ​​inner tube 3 of resistance balancing device, m2.

[0071] Due to the structural characteristics of the resistance balancing device itself, there are some specific requirements during its use.

[0072] 1. Once the structure and size of the resistance balance device are determined, they cannot be adjusted. This requires us to perform accurate resistance balance calculations on the pipe network when designing the dust removal pipe network system.

[0073] 2. Due to the non-adjustability of the resistance balancing device, designers are required to recalculate the resistance balance of the entire system network and recalibrate all resistance balancing devices when the network changes.

[0074] 3. For dust removal systems with high abrasiveness of dust, attention should be paid to anti-wear treatment when using resistance balancing device. However, for dust removal systems with low abrasiveness of dust, it does not constitute a major problem.

[0075] Furthermore, based on the aforementioned embodiment, in another embodiment of the present invention, emphasis is placed on improving how to replace the inner tube 3, that is, to avoid the cumbersome operation process in which the entire shell tube 1 needs to be disassembled before replacement after the pipeline network is changed, so that the change of the diameter of the inner tube 3 is more convenient.

[0076] For details, please combine Figures 3 to 8 As shown, the side wall of the shell tube 1 is provided with a mounting groove 5 extending in a direction parallel to the axis of the shell tube 1, the fixing ring 2 is in sliding contact with the inner wall of the shell tube 1, the outer edge of the fixing ring 2 is provided with a cylindrical handle 6, the cylindrical handle 6 passes through the mounting groove 5 and extends out of the shell tube 1, the mounting groove 5 includes a cylindrical groove 51 for accommodating the cylindrical handle 6, and the two ends of the cylindrical groove 51 parallel to the axis of the shell tube 1 are respectively connected to the through groove 52, the distance between the ends of the through groove 52 at both ends of the cylindrical groove 51 is the same as the outer diameter of the fixing ring 2, the width of the through groove 52 is the same as the length of the inner tube 3, the outer diameter of the cylindrical handle 6 is larger than the width of the through groove 52, and the outer edge of the fixing ring 2 is coaxially provided with a sealing rubber ring.

[0077] In this way, when a different inner tube 3 needs to be replaced, it is only necessary to rotate the cylindrical handle 6 to rotate the fixing ring 2 to a state where the axis is horizontal, and then pull it outward to remove the fixing ring 2 from the mounting groove 5. Then, the new fixing ring 2 with the inner tube 3 of a different diameter can be installed into the shell tube 1 through the mounting groove 5 in the opposite direction of the aforementioned removal process.

[0078] At the same time, the inner wall of the cylindrical groove 51 is provided with an arc plate 7 coaxially arranged therewith, and the inner diameter of the arc plate 7 is the same as the outer diameter of the cylindrical handle 6. The inner wall of the through groove 52 is provided with a support plate 8 connected to the arc plate 7 and in the same plane, and the support plate 8 includes a first support plate 81 connected to the arc plate 7, and the first support plate 81 is parallel to the axis of the shell tube 1, and the distance between the first support plates 81 symmetrical about the axis of the shell tube 1 is the same as the length of the inner tube 3. Second support plates 82 are provided at the upper and lower ends of the through groove 52, and the distance between the second support plates is the same as the outer diameter of the fixing ring 2. A baffle plate 9 is filled and installed in the mounting groove 5, and the baffle plate 9 fills the mounting groove 5 and contacts the arc plate 7 and the support plate 8. The baffle plate 9 is provided with a through channel 10 for the cylindrical handle 6 to pass through.

[0079] In this way, the baffle plate 9 is used to block the space between the mounting groove 5 and the cylindrical handle 6, and bolts are installed on the baffle plate 9, so that the baffle plate 9 and the support plate 8 can be disassembled and fixed by bolts, and after the bolts are tightened, the air tightness between the mounting groove 5 and the baffle plate 9 can be better, thereby avoiding air leakage in the tank body of the shell tube 1 after the fixing ring 2 is set to a detachable structure.

[0080] Furthermore, the upper and lower ends of the baffle plate 9 are fixed to the second support plate 82 by bolts, and a sealing rubber pad is installed on the side of the baffle plate 9 facing the arc plate 7 or the support plate 8, and the sealing rubber pad is in contact with the support plate 8 and the arc plate 7.

[0081] In this way, by using the sealing rubber pad in this embodiment, the airtightness between the baffle 9 and the support plate 8 and the arc plate 7 can be further increased. At the same time, by using the sealing rubber ring installed on the fixing ring 2, the airtightness between the outer edge of the fixing tube and the inner wall of the shell tube 1 under normal working conditions can be increased, thereby avoiding side leakage and deviation.

[0082] Furthermore, in order to make it easier for the fixing ring 2 to be installed without seeing the internal situation of the shell tube 1 during the installation process, the fixing ring 2 can be installed more accurately with the axis vertical, that is, installed to a normal working state, when the axis of the fixing ring 2 coincides with the axis of the shell tube 1, the upper and lower ends of the cylindrical handle 6 along the axis of the shell tube 1 are provided with limit grooves 11 derived from the axis of the cylindrical handle 6, the limit groove 11 is arranged in the same plane as the end of the baffle 9 facing the fixing ring 2, and the limit groove 11 passes through the end of the cylindrical handle 6 facing away from the fixing ring 2, and the upper and lower ends of the through channel 10 are provided with limit blocks 12 extending along the axis thereof, the limit block 12 extends toward the side facing away from the fixing ring 2, and the limit block 12 is slidably embedded in the limit groove 11.

[0083] In this way, after the baffle 9 is installed in the installation groove 5, when the limit block 12 installed on the through channel 10 is embedded and engaged with the limit groove 11 set on the cylindrical handle 6, and after the aforementioned embedding and engagement, the phase is completely matched with the limit groove 11, so that the axis of the fixing ring 2 of the fixing ring 2 can coincide with the axis of the shell tube 1, and then be installed into a working state, and through the engagement of the limit block 12 with the limit groove 11, it can also effectively prevent the fixed tube from rotating along the cylindrical handle 6 in the working state, thereby making the working state more stable.

[0084] Furthermore, in order to make it easier to remove the baffle plate 9 from the mounting groove 5 , the side of the baffle plate 9 facing away from the fixing ring 2 protrudes from the outer wall of the shell tube 1 .

[0085] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new and efficient ventilation system pipeline resistance balancing device, characterized by: It comprises a shell tube (1), the shell tube (1) is connected to a ventilation system pipeline, a fixing ring (2) is coaxially arranged inside the shell tube (1), and an inner tube (3) is coaxially mounted on the inner ring of the fixing ring (2); Flanges (4) for fixing to the ventilation system pipeline are coaxially mounted at both ends of the shell tube (1); The side wall of the shell tube (1) is provided with a mounting groove (5) extending in a direction parallel to the axis of the shell tube (1); the fixing ring (2) is in sliding contact with the inner wall of the shell tube (1); a cylindrical handle (6) is installed on the outer edge of the fixing ring (2); the cylindrical handle (6) passes through the mounting groove (5) and extends out of the shell tube (1); the mounting groove (5) comprises a cylindrical groove (51) for accommodating the cylindrical handle (6); two ends of the cylindrical groove (51) parallel to the axis of the shell tube (1) are respectively connected and provided with through grooves (52); the distance between the ends of the through groove (52) at both ends of the cylindrical groove (51) is the same as the outer diameter of the fixing ring (2); the width of the through groove (52) is the same as the length of the inner tube (3); the outer diameter of the cylindrical handle (6) is larger than the width of the through groove (52); and a sealing rubber ring is coaxially installed on the outer edge of the fixing ring (2); The inner wall of the cylindrical groove (51) is provided with an arc-shaped plate (7) coaxially arranged therewith, the inner diameter of the arc-shaped plate (7) being the same as the outer diameter of the cylindrical handle (6), the inner wall of the through groove (52) is provided with a support plate (8) connected to the arc-shaped plate (7) and in the same plane, the support plate (8) comprising a first support plate (81) connected to the arc-shaped plate (7), the first support plate (81) being parallel to the axis of the shell tube (1), and the first support plate (81) being symmetrical with respect to the axis of the shell tube (1). The distance between the plates (81) is the same as the length of the inner tube (3); the upper and lower ends of the through groove (52) are provided with second support plates (82); the distance between the second support plates (82) is the same as the outer diameter of the fixing ring (2); a baffle (9) is filled and installed in the installation groove (5); the baffle (9) fills the installation groove (5) and contacts the arc plate (7) and the support plate (8); the baffle (9) is provided with a through channel (10) for the cylindrical handle (6) to pass through; The upper and lower ends of the baffle plate (9) are removably fixed to the second support plate (82) by means of bolts, and a sealing rubber pad is installed on a surface of the baffle plate (9) facing the arc plate (7) or the support plate (8), and the sealing rubber pad is in contact with the support plate (8) and the arc plate (7); When the axis of the fixing ring (2) coincides with the axis of the shell tube (1), the cylindrical handle (6) is provided with a limit groove (11) derived from the axis of the cylindrical handle (6) at the upper and lower ends along the axis of the shell tube (1), the limit groove (11) is arranged on the same plane as the end of the baffle (9) facing the fixing ring (2), and the limit groove (11) passes through the end of the cylindrical handle (6) facing away from the fixing ring (2), and the upper and lower ends of the through channel (10) are both installed with a limit block (12) extending along the axis thereof, the limit block (12) extends toward the side facing away from the fixing ring (2), and the limit block (12) is slidably embedded and engaged with the limit groove (11).

2. A novel and efficient ventilation system pipeline resistance balancing device according to claim 1, characterized in that: A side of the baffle (9) facing away from the fixing ring (2) protrudes from the outer wall of the shell tube (1).

Images