The exhaust check valve that is used for board-like pressurized gas dry decontamination device
Technical field:
The utility model relates to gas unidirectional valve field, particularly a kind of one-way valve that is used for board-like pressurized gas dry decontamination device.
Background technique:
What install in the lower plate of existing board-like pressurized gas dry decontamination device is the embedded exhaust check valve of monomer, by the spiral plug, spring, seal ring and steel ball are formed, in assembly process, the steel ball center will with spring center on a center line, lower plate need be holded up and can be assembled success, has increased in the device maintenance process difficulty of changing this one-way valve greatly.
The model utility content:
The purpose of this utility model is to provide a kind of exhaust check valve of overall structure mode, and no matter which kind of mode is lower plate be is assembled, all can be convenient for assembly, solved the difficult problem in the assembling maintenance, and improved reliability and work efficiency.
The purpose of this utility model is achieved by the following technical programs:
The exhaust check valve that is used for board-like pressurized gas dry decontamination device, the valve body and the valve seat that comprise screw-thread fit, the central shaft of valve seat is to the pore that perforation is arranged, valve body is provided with the air cavity that is communicated with the valve seat pore, air cavity is circumferentially with the air-flow path that penetrates valve body wall, be provided with the spool of control air-flow path and pore break-make in the described air cavity, it is characterized in that: described spool be provided with inner chamber apart from the valve seat far-end, one spring is set in the inner chamber vertically, spool outer wall and valve interior wall Spielpassung, described valve seat the inner is provided with seal groove, is inserted in seal ring in the seal groove, and valve seat is inner to be sealed by the seal ring compressional deformation with valve interior wall.
The outer end of described valve seat is a conical surface, and this conical surface cooperates with mounting hole in the board-like pressurized gas dry decontamination device lower plate and forms the nonflexible line sealing.
The external diameter of the nearly valve seat end of described spool is less than the air cavity internal diameter, is convenient to that air-flow communicates between air-flow path and the pore.
When pore as gas-entered passageway, air-flow path is during as outlet passageway, high-pressure gas pressure impels the spool pressure spring to be moved to the left, the gas flow outlet passageway.When air-flow path as gas-entered passageway, pore is during as outlet passageway, pressurized gas enter valve inner, gas pressure is depressed on the spool face, impels spool and seal ring to closely cooperate, air-flow path is shut, and reaches the effect of unidirectional ventilation.
The utility model is to be connected with lower plate in the board-like pressurized gas dry decontamination device with the exhaust check valve of overall structure mode, no matter which kind of mode is lower plate be is assembled, all can be convenient for assembly, solved the difficult problem in the existing exhaust check valve assembling maintenance, improved reliability and work efficiency.
Description of drawings:
Fig. 1 is the utility model embodiment's a structural representation;
Fig. 2 is the erection drawing of lower plate in the utility model and the board-like pressurized gas dry decontamination device.
Among the figure: 1. valve seat, 2. valve body, 3. seal ring, 4. spool, 5. spring, 6. pore, 7. air-flow path, 8. air-flow path, 9. inner chamber, 10. conical surface, 11. air cavitys, 12. screw threads, 13. adsorption towers, 14. adsorption towers, 15 crest lines, 16 exhaust check valves, 17. exhaust passages.
Embodiment:
Below in conjunction with accompanying drawing the utility model is described in further detail:
As shown in Figure 1, valve seat 1 central shaft is to the pore 6 that perforation is arranged, valve body 2 is provided with the air cavity 11 that is communicated with valve seat pore 6, air cavity 11 is circumferentially with the air-flow path 7,8 that penetrates valve body wall, and spool 4 is provided with inner chamber 9 apart from the valve seat far-end, and spring 5 is put into inner chamber 9, pack into together then in the air cavity 11 of valve body 2, this moment spool 4 outer walls and valve body 2 inwall Spielpassung, the external diameter of the nearly valve seat end of spool is less than the air cavity internal diameter, is convenient to that air-flow communicates between air-flow path and the pore.Be inserted in seal ring 3 on the seal groove of valve seat 1 the inner, valve seat 1 is threaded with valve body 2 then, and the seal ring 3 of this moment because of the inwall with check valve body closely cooperates deformation takes place, being stuck in the seal groove tightly, and be unlikely to be washed out by high pressure draught.In conjunction with shown in Figure 2, this exhaust check valve 16 is installed in the inside groove of exhaust passage 17 1 sides of adsorption tower 13,14, to be conical surface 10 cooperate with mounting hole in the board-like pressurized gas dry decontamination device lower plate in the outer end of valve seat 1, and form the nonflexible lines sealing with accurate applying of crest line 15 of lower plate, when screwing in lower plate, whole one-way valve is threaded with lower plate by the screw thread on the valve body 2 12, no matter which kind of mode is lower plate be is assembled, all can be convenient for assembly, solve the difficult problem in the assembling maintenance, improved reliability and work efficiency.
When pressurized gas were entered by pore 6, gas pressure impelled spool 4 pressure springs 5 to be moved to the left, and air-flow path 7,8 is opened, and air-flow path 7,8 is as outlet passageway, the gas flow outlet passageway.When pressurized gas were entered by air-flow path 7,8, pressurized gas entered valve inner, and gas pressure is depressed on the spool face, impelled spool and seal ring 3 to closely cooperate, and air-flow path is shut, and reaches the effect of unidirectional ventilation.
The foregoing description only is a better embodiment of the present utility model; describe technical conceive of the present utility model and essential implementation in detail; be not to be that protection domain of the present utility model is limited; all any simple modification and equivalent structure transformation or modifications of being done according to the utility model spirit all should be encompassed within the protection domain of the present utility model.