CN216923216U - Three-way and two-way switching wind shielding device - Google Patents
Three-way and two-way switching wind shielding device Download PDFInfo
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- CN216923216U CN216923216U CN202220763222.9U CN202220763222U CN216923216U CN 216923216 U CN216923216 U CN 216923216U CN 202220763222 U CN202220763222 U CN 202220763222U CN 216923216 U CN216923216 U CN 216923216U
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- baffle
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- shielding device
- wind shielding
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- 238000007789 sealing Methods 0.000 claims abstract description 36
- 239000011521 glass Substances 0.000 claims description 3
- 230000003028 elevating effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 241000651994 Curio Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010206 sensitivity analysis Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a three-way and two-way switching wind shielding device which comprises a baffle part and a lifting device, wherein the baffle part comprises a baffle, rod pieces and a supporting table, the lower end surface of the baffle is squarely provided with four rod pieces, the upper ends of the four rod pieces are connected with the lower end surface of the baffle, and the lower ends of the four rod pieces are welded on the supporting table; the lifting device comprises a lifting platform, a screw rod, a disc and a base, wherein the lower end of the screw rod is fixedly arranged in the middle of the upper end face of the base, the disc is in threaded connection with the middle of the screw rod, the lifting platform is placed on the disc, the upper end of the lifting platform is in threaded connection with the lower end of a supporting platform, and the upper end of the screw rod penetrates through the lifting platform and the supporting platform. The utility model performs 45-degree inclination angle, sanding and edge sealing treatment on the boundary of the baffle plate, and when the air opening is sealed by the baffle plate, the tightness of the frosted, 45-degree inclination angle and edge sealing treatment on the boundary of the baffle plate is better than the original tightness without treatment.
Description
Technical Field
The utility model relates to a three-way and two-way switching wind shielding device.
Background
The subway as the engineering building of the underground passage has incomparable advantages of other projects, thereby showing a very obvious growth trend, which is characterized in that the mileage is continuously increased, the subway tunnel with extra and large length and large-scale tunnel groups are continuously emerged, and the projects crossing the water area in a tunnel mode are increasingly increased. Therefore, a series of relevant test models aiming at specific subway problems are generated, and the air ports of the test models are easy to have the problem of tightness.
Most of the current research on sealing performance focuses on the contact pressure of the sealing surfaces. Von curios et al have conducted extensive analyses of the sealing surfaces of metal gaskets, discussing the effects of contact pressure and roughness on sealing performance. Li Shao Tao et al utilized finite element analysis software to analyze the contact pressure distribution of the O-shaped sealing ring and the sensitivity of the maximum Mises stress to different oil pressures and compression ratios, and provided reference for the pressure application range of the O-shaped sealing ring. Lixiangyun and the like perform sensitivity analysis on the loading displacement and the geometric dimension of the joint sealing ring by a numerical simulation method, and obtain the relationship between the maximum contact pressure and each parameter.
Most of domestic and foreign researches are focused on various sealing measures and sealing effects thereof, and the research on the problem of the sealing performance of the three-way and two-way switching test model air inlet of the subway test model wind shielding device is less. In practical test, when the model tuyere needs not to be sealed, the baffle is arranged at the lower part of the pipeline, and when the baffle is needed, the supporting platform is supported upwards to enable the baffle to seal the tuyere and an iron rod is used for supporting the supporting platform below the baffle so as to prevent the baffle from falling down. According to the method for supporting the baffle by the iron rod, the baffle is stressed unevenly, the baffle cannot be completely attached to the air port in some places, and the boundary of the baffle is not subjected to any sealing reinforcing treatment, so that serious air leakage can occur in the test process, particularly when the running speed and the working pressure of a system are too high, the test accuracy is not facilitated, and the energy consumption is reduced.
Disclosure of Invention
In order to solve the technical problems, the utility model provides the three-way and two-way switching wind shielding device which is simple in structure, reliable in work and good in sealing effect.
The technical scheme for solving the technical problems is as follows: a three-way and two-way switching wind shielding device comprises a baffle part and a lifting device, wherein the baffle part comprises a baffle, rod pieces and a supporting table, the lower end surface of the baffle is square, four rod pieces are arranged on the lower end surface of the baffle, the upper ends of the four rod pieces are connected with the lower end surface of the baffle, and the lower ends of the four rod pieces are welded on the supporting table; the lifting device comprises a lifting platform, a screw rod, a disc and a base, wherein the lower end of the screw rod is fixedly arranged in the middle of the upper end face of the base, the disc is in threaded connection with the middle of the screw rod, the lifting platform is placed on the disc, the upper end of the lifting platform is in threaded connection with the lower end of a supporting platform, and the upper end of the screw rod penetrates through the lifting platform and the supporting platform.
According to the three-way and two-way switching wind shielding device, the edge of the baffle is sealed by using the sealing strip.
The three-way and two-way switching wind shielding device is characterized in that the baffle is made of organic glass.
In the three-way and two-way switching wind shielding device, the boundary of the baffle plate is subjected to 45-degree inclination angle and frosting treatment.
In the three-way and two-way switching wind shielding device, the external threads in the middle of the screw rod and the internal threads on the inner side of the disc are both rectangular threads.
In the three-way and two-way switching wind shielding device, the centers of the support table and the lifting table are provided with round holes with diameters larger than the diameter of the screw rod.
In the wind shielding device with the three-way and two-way switching, four rotating handles which form an angle of 90 degrees with each other are arranged on the side edge of the disc.
The three-way and two-way switching wind shielding device is characterized in that the sealing strip is a rubber sealing strip or a sponge strip.
The utility model has the beneficial effects that:
1. the utility model performs 45-degree inclination angle, sanding and edge sealing treatment on the boundary of the baffle plate, and when the air opening is sealed by the baffle plate, the tightness of the frosted, 45-degree inclination angle and edge sealing treatment on the boundary of the baffle plate is better than the original tightness without treatment.
2. The lifting device is arranged, when the air port needs to be sealed, the baffle is stably lifted by the lifting device, the condition that the stress of the baffle is uneven can be avoided, and the air port is better in sealing performance.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a schematic view of the structure of the baffle plate of the present invention.
FIG. 3 is a front view of the baffle plate and tuyere in accordance with the present invention.
Detailed Description
The utility model is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1-3, the three-way and two-way switching wind shielding device comprises a baffle part a and a lifting device B, wherein the baffle part a comprises a baffle 1, rod members 3 and a support table 4, the lower end surface of the baffle 1 is provided with four rod members 3 in a square shape, the upper ends of the four rod members 3 are connected with the lower end surface of the baffle 1, and the lower ends of the four rod members 3 are welded on the support table 4; elevating gear B includes elevating platform 5, lead screw 7, disc 6 and base 8, 7 lower extremes of lead screw are fixed to be set up in the middle of the 8 up end of base, 6 threaded connection of disc at 7 middle parts of lead screw, elevating platform 5 is placed on disc 6, 5 upper ends of elevating platform and the 4 lower extreme threaded connection of brace table, brace table 4 and 5 center openings of elevating platform have the diameter to slightly be greater than the round hole of 7 diameters of lead screw, and 7 upper ends of lead screw pass elevating platform 5 and the round hole of brace table 4.
The baffle 1 is made of organic glass, the edge of the baffle 1 is sealed by using a sealing strip 2, and the sealing strip 2 is a rubber sealing strip or a sponge strip; the boundary of the baffle plate 1 is subjected to 45-degree inclination angle and sanding treatment.
The external threads in the middle of the screw rod 7 and the internal threads on the inner side of the disc 6 are both rectangular threads.
Four rotating handles which form an angle of 90 degrees with each other are arranged on the side edge of the disc 6.
The thickness of the weather strip 2 satisfies the following equations (1) and (2).
Firstly, according to the 6.7.4 specification of GB 50019-2015 design Specification for heating, ventilation and air conditioning of industrial buildings, the air leakage rate of the system is controlled by selecting air duct materials and air duct manufacturing processes, and the air leakage rate of the system is in accordance with the following specification that a non-dust removal system is not more than 5%; the dust removal system is not suitable for exceeding 3 percent. The utility model belongs to a non-dust removal system, so that the air leakage rate of the system is not more than 5%.
Secondly, according to the air leakage rate determined in the first step, the maximum air leakage rate allowed by the left lane of the test model in the sea crossing area of Qingdao subway No. 8 line in the laboratory is obtained:
L＝F×V×3600×5％ (1)；
in formula (1): l, maximum air leakage rate, unit is m3H; f, the sectional area of the air duct is m2(ii) a V, the wind speed in the wind pipe is in m/s. In order to determine the range of the sealing strip thickness which can be suitable for the working of the air pipe system, the maximum air speed in the air pipe is taken to calculate to obtain the maximum air leakage rate. The cross-sectional area of the left lane of the laboratory Qingdao subway No. 8 line sea crossing test model is 0.281582m2The maximum running speed of the air duct under normal condition is 10m/s, and F is 0.281582m2Substituting the V of 10m/s into the formula (1) to obtain the maximum air leakage rate of 506.8476m of the left lane of the test model between the Qingdao subway line 8 and the sea crossing area3/h。
Thirdly, calculating the seam width by using a differential pressure method according to the maximum air leakage rate obtained by the formula (1) and the relevant data of the left lane of the test model between the sea crossing areas of the Qingdao subway No. 8 line so as to obtain the corresponding thickness of the sealing strip:
Ls＝0.827×a×b×(△P)1/d×3600×1.25 (2)；
in formula (2): l issPositive pressure air leakage rate in m3H; a, the total seam length is m; b, the seam width is m; Δ P, the differential pressure value, in Pa; d, index, taking 2 for door seams and larger air leakage areas, taking 1.6 for window seams and taking a dimensionless number; 0.827 and 1.25 are respectively a calculation constant and an additional coefficient for an imprecise gap; and a multiplied by b is the total effective air leakage area. And in order to determine that the thickness value of the sealing strip can be suitable for each working range of the air pipe system, calculating the maximum system working pressure of the air pipe. According to GB 50243-2016 ventilationThe air duct system specified in the 4.1.4 th specification of the air conditioning engineering construction and acceptance Specification is divided into four categories of micro pressure (P is less than or equal to 125 and P is more than or equal to-125), low pressure (P is more than 125 and less than or equal to 500 and P is more than or equal to 500 and less than or equal to-125), medium pressure (P is more than 500 and less than or equal to 1500 and less than or equal to 1000 and high pressure (P is more than 1500 and less than or equal to 2500 and more than or equal to 2000 and less than or equal to-1000) according to the working pressure, wherein P is the working pressure of the air duct system, the unit is Pa, namely the maximum working pressure of the air duct system is 2500 Pa. The values of the suspended ceiling exhaust port gap length a of 1.35m, the index d of 2 and the maximum air leakage rate of a Qingdao subway 8 line sea crossing area test model with the delta P of 2500Pa are taken as the positive pressure air leakage rate Ls＝506.8476m3Substituting the equation (2) into the equation (2) to calculate the slit width b to be about 2.02mm, namely ensuring that the air leakage rate of the test model is not more than 5% under the maximum speed and the maximum system working pressure, and the slit width can be less than or equal to 2 mm. In order to ensure that the sealing performance of the baffle cannot be influenced by the seam width when the baffle is attached to the air opening, the thickness of the sealing strip of the baffle is not more than 2mm corresponding to the seam width. The thickness of the existing three-way and two-way switching test model baffle sealing strip can be calculated by substituting the maximum running speed and the maximum working pressure of the system into formulas (1) and (2) to determine the seam width so as to obtain the corresponding thickness of the sealing strip.
The working principle is as follows: in the three-way and two-way switching test model, a baffle 1 and four rod pieces 3 are arranged inside a model pipeline, and the lower ends of the four rod pieces 3 are connected with a supporting table 4 at the lower part after passing through four holes at the bottom of the model, wherein the diameters of the four holes are the same as the diameters of the rod pieces 3, namely the supporting table 4 and the following parts are positioned at the lower part outside the model pipeline. The top of the model is provided with an air port, the baffle 1 is arranged at the bottom of the pipeline when the model does not need to be sealed, when the model needs to be sealed, the disk 6 stably rises along the rectangular thread on the screw rod 7 by rotating the disk 6, and the lifting platform 5 on the upper part of the disk 6 and the baffle part A stably rise along with the rectangular thread until the baffle 1 is completely attached to the air port. When sealing is not needed any more, the disc 6 is rotated reversely to enable the disc 6 to descend stably along the rectangular threads on the screw rod 7, and because the centers of the support platform 4 and the lifting platform 5 are provided with the round holes slightly larger than the diameter of the screw rod 7, when the disc 6 descends along the screw rod 7, the upper baffle plate part A of the disc and the lifting platform 5 move downwards together until the baffle plate 1 is arranged at the bottom of the model.
The structure of the utility model solves the problem that the air port tightness of the existing three-way and two-way switching test model is not ideal enough, the frosting of the baffle plate boundary, the 45-degree inclination angle and the edge sealing treatment method of the sealing strip are simple, the cost is low, the selected lifting device has small volume and simple structure, is convenient to install and disassemble, and is easier to popularize and use in practical situations.
Claims (8)
1. The three-way and two-way switching wind shielding device is characterized by comprising a baffle part and a lifting device, wherein the baffle part comprises a baffle, rod pieces and a supporting table, the lower end surface of the baffle is squarely provided with four rod pieces, the upper ends of the four rod pieces are connected with the lower end surface of the baffle, and the lower ends of the four rod pieces are welded on the supporting table; the lifting device comprises a lifting platform, a screw rod, a disc and a base, wherein the lower end of the screw rod is fixedly arranged in the middle of the upper end face of the base, the disc is in threaded connection with the middle of the screw rod, the lifting platform is placed on the disc, the upper end of the lifting platform is in threaded connection with the lower end of a supporting platform, and the upper end of the screw rod penetrates through the lifting platform and the supporting platform.
2. The three-way and two-way switching wind shielding device according to claim 1, wherein: and the boundary of the baffle is sealed by a sealing strip.
3. The three-way and two-way switching wind shielding device according to claim 1, wherein: the baffle is made of organic glass.
4. The three-way and two-way switching wind shielding device according to claim 1, wherein: and performing 45-degree inclination angle and sanding treatment on the boundary of the baffle.
5. The three-way and two-way switching wind shielding device according to claim 1, wherein: the external threads in the middle of the screw rod and the internal threads on the inner side of the disc are both rectangular threads.
6. The three-way and two-way switching wind shielding device according to claim 1, wherein: and a circular hole with the diameter larger than that of the screw rod is formed in the center of the supporting platform and the center of the lifting platform.
7. The three-way and two-way switching wind shielding device according to claim 1, wherein: four rotating handles which form an angle of 90 degrees with each other are arranged on the side edge of the disc.
8. The three-way and two-way switching wind shielding device according to claim 2, wherein: the sealing strip is a rubber sealing strip or a sponge strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220763222.9U CN216923216U (en) | 2022-04-02 | 2022-04-02 | Three-way and two-way switching wind shielding device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220763222.9U CN216923216U (en) | 2022-04-02 | 2022-04-02 | Three-way and two-way switching wind shielding device |
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| CN216923216U true CN216923216U (en) | 2022-07-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562566A (en) * | 2022-04-02 | 2022-05-31 | 中铁隧道勘测设计院有限公司 | Three-way and two-way switching wind shielding device and sealing determination method thereof |
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- 2022-04-02 CN CN202220763222.9U patent/CN216923216U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562566A (en) * | 2022-04-02 | 2022-05-31 | 中铁隧道勘测设计院有限公司 | Three-way and two-way switching wind shielding device and sealing determination method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 411201 No. 2 stone wharf, Yuhu District, Hunan, Xiangtan Patentee after: HUNAN University OF SCIENCE AND TECHNOLOGY Patentee after: CHINA RAILWAY TUNNEL SURVEY & DESIGN INSTITUTE Co.,Ltd. Patentee after: GUILIN University OF AEROSPACE TECHNOLOGY Address before: 300000 Hongqiao District, Tianjin City, Bridge South East Road Patentee before: CHINA RAILWAY TUNNEL SURVEY & DESIGN INSTITUTE Co.,Ltd. Patentee before: HUNAN University OF SCIENCE AND TECHNOLOGY Patentee before: GUILIN University OF AEROSPACE TECHNOLOGY |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220708 |
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| CF01 | Termination of patent right due to non-payment of annual fee |