CN203571114U - Self-control reflux valve with rotary valve used as bypass structure - Google Patents
Self-control reflux valve with rotary valve used as bypass structure Download PDFInfo
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- CN203571114U CN203571114U CN201320668551.6U CN201320668551U CN203571114U CN 203571114 U CN203571114 U CN 203571114U CN 201320668551 U CN201320668551 U CN 201320668551U CN 203571114 U CN203571114 U CN 203571114U
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- valve
- valve body
- guide rod
- rotary valve
- bypass
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- 238000010992 reflux Methods 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 9
- 238000002309 gasification Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 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 belongs to the technology of valves, and particularly discloses a self-control reflux valve with a rotary valve used as a bypass structure. The self-control reflux valve comprises a valve body, a valve deck and a bypass valve body. An upper supporting disk and a guide rod threaded sleeve are arranged inside the valve deck, a lower supporting disk and a check valve are arranged inside the valve body, a valve head is arranged on the side wall of the valve body in a sealing mode, and the rotary valve is arranged on the inner side of the valve head. A horizontal through cavity inside the bypass valve body is communicated with an opening in the outer side of the valve head, the rotary valve is communicated with an inner cavity of the valve body, and the valve head is provided with a channel which is communicated with the rotary valve and the opening in the outer side of the valve head. The rotary valve is designed to be arranged inside the valve head, a guide rod is designed to be arranged on the check valve, the check valve senses flow change, the guide rod is used for driving the rotary valve to rotate, and automatic switchover for opening and closing a bypass is achieved. When the rotary valve rotates, only the guide rod and the rotary valve rotate, other components are not driven to rotate, hence, the number of rotating components is few, rotating friction force is small, and it is guaranteed that a main pass and the bypass can be switched smoothly.
Description
Technical field
The utility model belongs to valve technology, is specifically related to a kind of automatic control reflux valve.
Background technique
On centrifugal pump " characteristic " set of curves, the pressure head of Minimal energy loss and flow point are called best efficiency point (BEP).And in actual applications, the pump most of the time is to move under non-BEP operating mode, when pump continuous service or circulate in repeatedly and be starkly lower than BEP and (for example,, during flow district 50%BEP), just there will be the problem relevant to low discharge.In these low discharge districts, the performance of pump and system unit and life-span can be subject to negative impact.Especially for large-scale high energy pump (for example: boiler feed pump), carry hot liquid pump, carry the pump and the condensed fluid supply pump that contain solid particle liquid, the pressure of impeller inside is different, inlet pressure is lower, outlet pressure is higher.And the gasification temperature of liquid is related with pressure; Pressure lower (or higher), corresponding gasification temperature is lower (or higher) also.When pump startup and unskilled labourer's skill flow, liquid enters temperature in pump higher than the corresponding vapourizing temperature of inlet pressure, partially liq can produce gasification, form bubble, and when bubble is taken to the higher region of pressure by liquid, due to the corresponding raising of corresponding gasification temperature, steam can be condensed into liquid again again, and bubble breaks rapidly.At this moment, because the density of gas, liquid differs hundred times, so condense at bubble, moment that volume dwindles suddenly, liquid around just rushes at the original shared space of bubble with very high speed, at liquid internal, fierce impact occurs.If this phenomenon occurs in the surface of blade, metallic material is etched because being repeatedly subject to very high impact stress, so be called " cavitation erosion ".When cavitation erosion process occurs, the fierce fluctuation of outlet pressure, mobile continuity is destroyed, and the flow of pump sharply declines.Visible low discharge problem is the most harmful.
Current conventional High Pressure Difference automatic control reflux valve by-pass reducing parts are generally the throttling string with multi-step pressure reduction mechanism, but by-pass throttle string changes in very little situation restrictor ring area change at stroke, very greatly, such structure is difficult to regulate in the situation that small flow bypass pressure drop is very large; The frictional force that conventional multi-step pressure reduction throttling string need to have certain thrust to overcome between seal ring and parts in addition just can make bypass open, and therefore the bypass phenomenon of not opening usually occurs, and affects the normal work of centrifugal pump.
Summary of the invention
The purpose of this utility model is to provide a kind of can solve by-pass throttle string convection current quantitative limitation, guarantee the automatic control reflux valve that by-pass structure that pump runs well when minimum discharge is rotary valve.
The technical solution of the utility model is as follows:
By-pass structure is an automatic control reflux valve for rotary valve, comprises valve body and the valve gap that is fixedly located at valve body top, is provided with upper support dish and guide rod swivel nut in described valve gap, and the upper end of described guide rod swivel nut is connected with upper support dish; In described valve body, be provided with lower support dish and safety check, the upper end of described safety check and above-mentioned guide rod swivel nut are fixed, in the chamber that safety check and guide rod swivel nut surround, be provided with spring, described safety check is provided with guide rod, and the end of safety check is connected with described lower support dish, and on described body wall, sealing is provided with valve head, the inner side of valve head is provided with rotary valve, described rotary valve is connected with above-mentioned guide rod, and the outside of described valve head is processed with opening, leads to outside valve body; Also comprise the bypass valve body that is fixedly mounted on valve body one side, the horizontal cavity in this bypass valve body communicates with the outer openings of described valve head; Described rotary valve communicates with body cavity, and described valve head is provided with the passage that is communicated with rotary valve and above-mentioned outer openings.
In the automatic control reflux valve that is rotary valve at above-mentioned by-pass structure: be processed with duct on described described rotary valve.
In the automatic control reflux valve that is rotary valve at above-mentioned by-pass structure: be provided with restricting orifice in the described horizontal cavity of bypass valve body, this restricting orifice comprises the laminate that some layers protrude to valve body one side, is processed with throttle orifice on each laminate.
The beneficial effects of the utility model are:
The rotary valve that design is rotated in valve head designs guide rod on safety check, and the variation of safety check sensitive flow utilizes guide rod to drive rotary valve to rotate, and has realized the automatic switchover that bypass opens and closes.When rotary valve rotates, the rotation to relating to guide rod and rotary valve self, does not drive other parts, so rotatable parts are few, and rotation friction is little, guarantees the smooth switching of main road and bypass.
Further, the restricting orifice of design is comprised of multistage laminate, on every laminate, is processed with throttle orifice, realizes the expenditure and pressure of bypass;
Valve head and rotary valve are installed for sealing, and bypass member is that all-metal sealing is installed, and therefore without sealing at the nonmetal seal ring of design, therefore needn't as using nonmetal seal ring, be subject to the restriction of surrounding medium, temperature, applied widely.
Accompanying drawing explanation
Fig. 1 is that by-pass structure is the automatic control reflux valve schematic diagram of rotary valve;
Fig. 2 is that rotary valve position view is closed in bypass;
Fig. 3 is that rotary valve position view is opened in bypass;
In figure: 1. valve body; 2. valve gap; 3. upper support dish; 4. guide rod swivel nut; 5. spring; 6. lower support dish; 7. safety check; 8. bypass valve body; 9. guide rod; 10. rotary valve; 11. valve heads; 12. restricting orifices; 13. double-screw bolts; 14. nuts; 15. bypass double-screw bolts; 16. bypass nuts; 17. openings; 18. ducts; 19. passages; 20. laminates; 21. throttle orifices.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, the valve gap 2 of top and the valve body 1 of below are fixedly connected with double-screw bolt 13 by nut 14.The inner chamber of valve gap 2 and valve body 1 communicates, and forms complete valve pocket.The described interior fixed installation upper support of valve gap 2 dish 3 and guide rod swivel nut 4, the upper end of described guide rod swivel nut 4, through the hole at upper support dish 3 centers, is connected with upper support dish 3.
The described interior fixed installation lower support of valve body 1 dish 6 and safety check 7, the ladder step place of valve body 1 inwall is blocked in the convex edge of safety check 7 both sides, and safety check 7 is fixed in valve body 1.The upper end of safety check 7 is fixedly connected with guide rod swivel nut 4 simultaneously, in the chamber that safety check 7 and guide rod swivel nut 4 surround, spring 5 is installed.The lower end of safety check 7 is processed with horizontal mounting hole, and guide rod 9 is installed in hole, and the end of safety check 7 is elongated rod shape simultaneously, and stock extend into the hole at the center of lower support dish 6, is connected with lower support dish 3.
On valve body 1 sidewall, be sealed and installed with valve head 11.The inner side of described valve head 11 is provided with rotary valve 10, and this rotary valve 10 is connected with above-mentioned guide rod 9.The outside of valve head 11 is processed with opening 17, leads to outside valve body 1.
Bypass valve body 8 is fixedly mounted on valve body 1 one sides by bypass double-screw bolt 15 and bypass nut 16.The cavity that is processed with level in described bypass valve body 8, is provided with restricting orifice 12 in cavity, the horizontal cavity of bypass valve body 8 and the outer openings 17 of above-mentioned valve head 11 communicate.
As shown in Figure 1, described restricting orifice 12 comprises 3 layers of laminate 20 protruding to valve body 1 one sides, on each laminate 20, is processed with throttle orifice 21, and therefore the outer openings 17 of above-mentioned valve head 11 and the horizontal cavity of bypass valve body 8 communicate.
As shown in Figures 2 and 3, on described rotary valve 10, be processed with duct 18, on valve head 11, be processed with passage 19 between rotary valve 10 and outer openings 17.
When bypass is closed, the duct 18 on rotary valve 10 is not communicated with above-mentioned passage 19, thereby duct 18 is not communicated with opening 17.
When process requirements flow is during lower than the Minimum water flow of pump, the variation of safety check 7 sensitive flows moves downward, and drive guide rod 9 to move downward, rotary valve 10 is rotated counterclockwise under the effect of unbalanced force, runner is opened gradually, with this, guarantee the necessary minimum discharge of pump, simultaneously medium is realized decompression by restricting orifice 12, prevents the damage that pump causes due to overheated, serious noise and cavitation when underrun; On the contrary, when process requirements flow increases, the variation of safety check 7 sensitive flows upwardly opens gradually, safety check 7 drives operating handle 9 to move up, operating handle 9 drives rotary valve 10 to clockwise direction rotation, and rotary valve runner is blocked gradually and closes by valve head 11, realizes energy-conserving action.
Claims (3)
1. the automatic control reflux valve that by-pass structure is rotary valve, comprise valve body (1) and be fixedly located at the valve gap (2) of valve body (1) top, in described valve gap (2), be provided with upper support dish (3) and guide rod swivel nut (4), the upper end of described guide rod swivel nut (4) is connected with upper support dish (3); In described valve body (1), be provided with lower support dish (6) and safety check (7), the upper end of described safety check 7 and above-mentioned guide rod swivel nut (4) are fixing, in the chamber that safety check (7) and guide rod swivel nut (4) surround, be provided with spring (5), described safety check (7) is provided with guide rod (9), and the end of safety check (7) is connected with described lower support dish (3); It is characterized in that: on described valve body (1) sidewall, sealing is provided with valve head (11), the inner side of valve head (11) is provided with rotary valve (10), described rotary valve (10) is connected with above-mentioned guide rod (9), and the outside of described valve head (11) is processed with opening (17), leads to outside valve body (1); Also comprise the bypass valve body (8) that is fixedly mounted on valve body (1) one side, the horizontal cavity in this bypass valve body (8) communicates with the outer openings (17) of described valve head (11); Described rotary valve (10) communicates with valve body (1) inner chamber, and described valve head (11) is provided with the passage (19) that is communicated with rotary valve (10) and above-mentioned outer openings (17).
2. the automatic control reflux valve that by-pass structure as claimed in claim 1 is rotary valve, is characterized in that: on described described rotary valve (10), be processed with duct (18).
3. the automatic control reflux valve that by-pass structure as claimed in claim 1 is rotary valve, it is characterized in that: in the described horizontal cavity of bypass valve body (8), be provided with restricting orifice (12), this restricting orifice (12) comprises the laminate (20) that some layers protrude to valve body (1) one side, is processed with throttle orifice (21) on each laminate (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320668551.6U CN203571114U (en) | 2013-10-28 | 2013-10-28 | Self-control reflux valve with rotary valve used as bypass structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320668551.6U CN203571114U (en) | 2013-10-28 | 2013-10-28 | Self-control reflux valve with rotary valve used as bypass structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203571114U true CN203571114U (en) | 2014-04-30 |
Family
ID=50538846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320668551.6U Expired - Lifetime CN203571114U (en) | 2013-10-28 | 2013-10-28 | Self-control reflux valve with rotary valve used as bypass structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203571114U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565453A (en) * | 2013-10-28 | 2015-04-29 | 北京航天动力研究所 | Self-controlled reflux valve with rotary valve as bypass structure |
| CN104633176A (en) * | 2015-02-12 | 2015-05-20 | 无锡卓尔阀业有限公司 | Self-operated attemperator |
-
2013
- 2013-10-28 CN CN201320668551.6U patent/CN203571114U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565453A (en) * | 2013-10-28 | 2015-04-29 | 北京航天动力研究所 | Self-controlled reflux valve with rotary valve as bypass structure |
| CN104633176A (en) * | 2015-02-12 | 2015-05-20 | 无锡卓尔阀业有限公司 | Self-operated attemperator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |