CN204176197U - The special reducing of VMC is direct - Google Patents
The special reducing of VMC is direct Download PDFInfo
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- CN204176197U CN204176197U CN201420647653.4U CN201420647653U CN204176197U CN 204176197 U CN204176197 U CN 204176197U CN 201420647653 U CN201420647653 U CN 201420647653U CN 204176197 U CN204176197 U CN 204176197U
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Abstract
The utility model discloses the special reducing of VMC direct, the circular hard joint be formed in one; Described joint comprises microcephaly (1), stage casing (2) and the major part (3) of coaxial connection successively; Described stage casing (2) is the reducer pipe of tapered of inwall; Described microcephaly (1) is inwall equal pipe, one end seamless link less with stage casing (2) internal diameter; Described major part (3) is inwall equal pipe, one end seamless link larger with stage casing (2) internal diameter; Connection, stage casing (2) in described microcephaly (1) and stage casing (2) are smooth transition with the connection of major part (3).The special reducing of the VMC that the utility model relates to is direct, as the link of the different airduct of two caliber sizes, has that windage is little, the feature of stable performance.
Description
Technical field
The utility model relates to VMC pipe joint, specifically refers to that the special reducing of VMC is direct.
Background technique
Windage is as the important indicator weighing tube performance in VMC, mainly be divided into two parts: one is the surface friction drag or on-way resistance that produce along journey energy loss due to the friction between the viscosity of air own and tube wall thereof, two be due to air flow through pipe fitting in airduct and equipment time, due to the change of flow velocity size and Orientation and produce eddy current and cause the local resistance of relatively concentrating energy loss.In order to reduce the windage because increasing when dust diameter changes suddenly, need to propose the special reducing of VMC direct.
Model utility content
The purpose of this utility model is to provide the special reducing of VMC direct, as the link of the different airduct of two caliber sizes, has that windage is little, the feature of stable performance.
The utility model is achieved through the following technical solutions: the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly, stage casing and major part; Described stage casing is the reducer pipe of tapered of inwall; Described microcephaly is inwall equal pipe, one end seamless link less with stage casing internal diameter; Described major part is inwall equal pipe, one end seamless link larger with stage casing internal diameter; The connection of the connection in described microcephaly and stage casing, stage casing and major part is smooth transition.
The microcephaly at the utility model two ends, major part are equal pipe, and be connected for the airduct different with caliber is directly corresponding, stage casing is the gradual reducer pipe that two ends connect microcephaly, major part respectively, for excessively being connected by airducts different for caliber.Microcephaly, major part are joint two ends, and airducts different from two caliber sizes is respectively corresponding to be connected.Air in airduct enters stage casing from joint one end, and the stage casing slowly changed by section area, enters the other end, and the ventilation completing two airducts connects.Stage casing of the present utility model is the reducer pipe of tapered of inwall, and its section area and diameter of section exist the function relation of quadratic power, when diameter of section linearly changes in the axial direction, and the gradual change of section area also in function relation.Reducer pipe and the inwall of conical surface are that the reducer pipe that changes of stepped shaft compares, and section area is gradual change but not abrupt change, decrease the energy loss relatively concentrated changing rapidly and produce eddy current because of air velocity and direction and cause.In addition, stage casing of the present utility model is coaxitron, so the active force of inside is cancelled out each other and decreases the active force of air to tube wall during direction of air change, and then reduces windage.Windage main source is divided into on-way resistance and local resistance.Adopt coaxial reducing direct, first reduce local resistance.
Further, the central angle between the conical surface in described stage casing and axis is α, 15 °≤α≤25 °.According to fluid mechanics test, reducer pipe central angle is 15 °-25 ° time, and windage is minimum.
Further, described microcephaly's internal diameter is 75mm or major part internal diameter is 110mm.The reducing of described φ 75-φ 110 is directly reducing crossover sub conventional in VMC, and one end connects φ 75 airduct, and the other end connects the airduct of φ 110, realizes the seamless link of φ 75 airduct and φ 110 airduct.
Further, the joint of the connection in described microcephaly and stage casing, stage casing and major part is arc transition; Described radius of arc is R, 75mm≤R≤220mm.According to fluid mechanics test, when reducer pipe wind direction radius of turn is of a size of the 1-2 times of caliber, windage is less.
Further, the pipe thickness of described microcephaly, stage casing, major part is identical; Described pipe thickness is 3-5mm.Adopt the convenient processing of the thick structures such as tube wall and use.Employing pipe thickness is the thickening design of 3-5mm, can partially absorb the noise of windage generation in joint and reduce noise emissions, can also prevent cracking and extend its working life.
Further, the inner wall smooth of described microcephaly, stage casing, major part, and inner wall roughness Ra is less than 0.16.Inner wall smooth, can reducing the on-way resistance produced because rubbing between the viscosity of air own and tube wall, can reduce windage further.
Further, described major part is also provided with back-up ring outward away from the one end in stage casing, and major part and back-up ring seamless link; Described back-up ring external diameter is 120mm.Back-up ring is set and carries out thickening process at major part connecting end, prevent joint from ftractureing and extending its working life.
Further, described joint total length is 127mm.
Further, the material of described joint adopts PVC.
The utility model compared with prior art, has the following advantages and beneficial effect:
(1) the utility model is by arranging the stage casing of gradual reducer pipe and limiting its center angular region, reduces local resistance.
(2) the utility model is by arranging coaxial fitting and limiting the radius of each several part joint transition circular arc, reduces local resistance further.
(3) the utility model is by arranging smooth inner wall, can reduce on-way resistance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the schematic diagram of central angle alpha between the conical surface in stage casing and axis.
Fig. 3 is the schematic diagram of joint radius of arc R.
Wherein: 1-microcephaly, 2-stage casing, 3-major part.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but mode of execution of the present utility model is not limited thereto.
Embodiment 1:
The special reducing of VMC of the present embodiment is direct, as shown in Figure 1, is mainly achieved through the following technical solutions: the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3.
Microcephaly 1, the major part 3 at the utility model two ends are equal pipe, and be connected for the airduct different with caliber is directly corresponding, stage casing 2 is the gradual reducer pipe that two ends connect microcephaly 1, major part 3 respectively, for excessively being connected by airducts different for caliber.Microcephaly 1, major part 3 are joint two ends, and airducts different from two caliber sizes is respectively corresponding to be connected.Air in airduct enters stage casing 2 from joint one end, and the stage casing 2 slowly changed by section area, enters the other end, and the ventilation completing two airducts connects.Stage casing 2 of the present utility model is the reducer pipe of tapered of inwall, and its section area and diameter of section exist the function relation of quadratic power, when diameter of section linearly changes in the axial direction, and the gradual change of section area also in function relation.Reducer pipe and the inwall of conical surface are that the reducer pipe that changes of stepped shaft compares, and section area is gradual change but not abrupt change, decrease the energy loss relatively concentrated changing rapidly and produce eddy current because of air velocity and direction and cause.In addition, stage casing 2 of the present utility model is coaxitron, so the active force of inside is cancelled out each other and decreases the active force of air to tube wall during direction of air change, and then reduces windage.Windage main source is divided into on-way resistance and local resistance.Adopt coaxial reducing direct, first reduce local resistance.
Embodiment 2:
The present embodiment does further optimization on above-described embodiment basis, and as shown in Figure 2, the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; Central angle between the conical surface in described stage casing 2 and axis is α, 15 °≤α≤25 °.According to fluid mechanics test, reducer pipe central angle is 15 °-25 ° time, and windage is minimum.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 3:
The present embodiment does further optimization on above-described embodiment basis, and the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; Described microcephaly 1 internal diameter is 75mm or major part 3 internal diameter is 110mm.The reducing of described φ 75-φ 110 is directly reducing crossover sub conventional in VMC, and one end connects the airduct of φ 75, and the other end connects the airduct of φ 110, realizes the seamless link of φ 75 airduct and φ 110 airduct.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 4:
The present embodiment does further optimization on above-described embodiment basis, and as shown in Figure 3, the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are arc transition with the joint of major part 3; Described radius of arc is R, 75mm≤R≤220mm.According to fluid mechanics test, when reducer pipe wind direction radius of turn is of a size of the 1-2 times of caliber, windage is less.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 5:
The present embodiment does further optimization on above-described embodiment basis, and as shown in Figure 3, the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; Described microcephaly 1 internal diameter is 75mm or major part 3 internal diameter is 110mm; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are arc transition with the joint of major part 3; Described radius of arc is R, 75mm≤R≤220mm.According to fluid mechanics test, when reducer pipe wind direction radius of turn is of a size of the 1-2 times of caliber, windage is less.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 6:
The present embodiment does further optimization on above-described embodiment basis, and the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; The pipe thickness of described microcephaly 1, stage casing 2, major part 3 is identical; Described pipe thickness is 3-5mm.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 7:
The present embodiment does further optimization on above-described embodiment basis, and the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; The inner wall smooth of described microcephaly 1, stage casing 2, major part 3, and inner wall roughness Ra is less than 0.16.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 8:
The present embodiment does further optimization on above-described embodiment basis, and the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; The pipe thickness of described microcephaly 1, stage casing 2, major part 3 is identical; Described pipe thickness is 3-5mm; The inner wall smooth of described microcephaly 1, stage casing 2, major part 3, and inner wall roughness Ra is less than 0.16.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 9:
The present embodiment does further optimization on above-described embodiment basis, and the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; Described major part 3 is also provided with back-up ring outward away from the one end in stage casing 2, and major part 3 and back-up ring seamless link; Described back-up ring external diameter is 120mm.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 10:
The present embodiment does further optimization on above-described embodiment basis, and the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; Described joint total length is 127mm.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 11:
The present embodiment does further optimization on above-described embodiment basis, and further, the material of described joint adopts PVC.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
Embodiment 12:
The present embodiment does further optimization on above-described embodiment basis, and the special reducing of VMC is direct, the circular hard joint be formed in one; Described joint comprise successively coaxial connect microcephaly 1, stage casing 2 and major part 3; Described stage casing 2 is the reducer pipe of tapered of inwall; Described microcephaly 1 is inwall equal pipe, one end seamless link less with stage casing 2 internal diameter; Described major part 3 is inwall equal pipe, one end seamless link larger with stage casing 2 internal diameter; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are smooth transition with the connection of major part 3; Central angle between the conical surface in described stage casing 2 and axis is α, 15 °≤α≤25 °; Described microcephaly 1 internal diameter is 75mm or major part 3 internal diameter is 110mm; Connection, the stage casing 2 in described microcephaly 1 and stage casing 2 are arc transition with the joint of major part 3; Described radius of arc is R, 75mm≤R≤220mm; The pipe thickness of described microcephaly 1, stage casing 2, major part 3 is identical; Described pipe thickness is 3-5mm; The inner wall smooth of described microcephaly 1, stage casing 2, major part 3, and inner wall roughness Ra is less than 0.16; Described major part 3 is also provided with back-up ring outward away from the one end in stage casing 2, and major part 3 and back-up ring seamless link; Described back-up ring external diameter is 120mm; Described joint total length is 127mm; The material of described joint adopts PVC.Other parts of the present embodiment are same as the previously described embodiments, therefore repeat no more.
The above; it is only preferred embodiment of the present utility model; not do any pro forma restriction to the utility model, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present utility model, all falls within protection domain of the present utility model.
Claims (9)
1. the special reducing of VMC is direct, it is characterized in that: the circular hard joint be formed in one; Described joint comprises microcephaly (1), stage casing (2) and the major part (3) of coaxial connection successively; Described stage casing (2) is the reducer pipe of tapered of inwall; Described microcephaly (1) is inwall equal pipe, one end seamless link less with stage casing (2) internal diameter; Described major part (3) is inwall equal pipe, one end seamless link larger with stage casing (2) internal diameter; Connection, stage casing (2) in described microcephaly (1) and stage casing (2) are smooth transition with the connection of major part (3).
2. the special reducing of VMC according to claim 1 is direct, it is characterized in that: the central angle between the conical surface of described stage casing (2) and axis is α, 15 °≤α≤25 °.
3. the special reducing of VMC according to claim 1 is direct, it is characterized in that: described microcephaly (1) internal diameter is 75mm or major part (3) internal diameter is 110mm.
4. the special reducing of VMC according to claim 3 is direct, it is characterized in that: connection, stage casing (2) in described microcephaly (1) and stage casing (2) are arc transition with the joint of major part (3); Described radius of arc is R, 75mm≤R≤220mm.
5. the special reducing of VMC according to claim 1 is direct, it is characterized in that: the pipe thickness of described microcephaly (1), stage casing (2), major part (3) is identical; Described pipe thickness is 3-5mm.
6. the special reducing of VMC according to claim 5 is direct, it is characterized in that: the inner wall smooth of described microcephaly (1), stage casing (2), major part (3), and inner wall roughness Ra is less than 0.16.
7. the special reducing of VMC according to claim 1 is direct, it is characterized in that: described major part (3) is also provided with back-up ring outward away from the one end of stage casing (2), and major part (3) and back-up ring seamless link; Described back-up ring external diameter is 120mm.
8. the special reducing of VMC according to claim 1 is direct, it is characterized in that: described joint total length is 127mm.
9. direct according to the special reducing of VMC of claim 1-8 described in any one, it is characterized in that: the material of described joint adopts PVC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420647653.4U CN204176197U (en) | 2014-11-03 | 2014-11-03 | The special reducing of VMC is direct |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420647653.4U CN204176197U (en) | 2014-11-03 | 2014-11-03 | The special reducing of VMC is direct |
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| CN204176197U true CN204176197U (en) | 2015-02-25 |
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| CN201420647653.4U Active CN204176197U (en) | 2014-11-03 | 2014-11-03 | The special reducing of VMC is direct |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207906A (en) * | 2016-08-26 | 2016-12-07 | 天津市天友建筑设计股份有限公司 | Cross pipe-line device for floor dark compress line |
| CN106300177A (en) * | 2016-08-26 | 2017-01-04 | 天津市天友建筑设计股份有限公司 | Combined cross pipe-line device for floor dark compress line |
| CN106451279A (en) * | 2016-08-26 | 2017-02-22 | 天津市天友建筑设计股份有限公司 | Special 45-degree pipeline crossing device for floor concealed wiring used for PVC20 pipe and PVC40 pipe |
| CN107362022A (en) * | 2017-08-18 | 2017-11-21 | 南京乐基医疗器械有限公司 | Full thoracic cavity high-frequency impulse sputum excretion system and its pectoral girdle |
| CN107621035A (en) * | 2017-08-10 | 2018-01-23 | 华中科技大学 | A kind of fresh air distributor box and the bidirectional flow VMC for including it |
-
2014
- 2014-11-03 CN CN201420647653.4U patent/CN204176197U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207906A (en) * | 2016-08-26 | 2016-12-07 | 天津市天友建筑设计股份有限公司 | Cross pipe-line device for floor dark compress line |
| CN106300177A (en) * | 2016-08-26 | 2017-01-04 | 天津市天友建筑设计股份有限公司 | Combined cross pipe-line device for floor dark compress line |
| CN106451279A (en) * | 2016-08-26 | 2017-02-22 | 天津市天友建筑设计股份有限公司 | Special 45-degree pipeline crossing device for floor concealed wiring used for PVC20 pipe and PVC40 pipe |
| CN106300177B (en) * | 2016-08-26 | 2020-01-14 | 天津市天友建筑设计股份有限公司 | Combined pipeline cross device for floor concealed laying and wiring |
| CN107621035A (en) * | 2017-08-10 | 2018-01-23 | 华中科技大学 | A kind of fresh air distributor box and the bidirectional flow VMC for including it |
| CN107621035B (en) * | 2017-08-10 | 2019-11-12 | 华中科技大学 | A kind of fresh air distributor box and the bidirectional flow fresh air system comprising it |
| CN107362022A (en) * | 2017-08-18 | 2017-11-21 | 南京乐基医疗器械有限公司 | Full thoracic cavity high-frequency impulse sputum excretion system and its pectoral girdle |
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