A kind of gas charging valve
The utility model relates to a kind of valve, more particularly, relates to a kind of gas charging valve.
Gas charging valve is as the crucial control valve of high pressure air gas storage system, comparatively general in sector applications such as metallurgy, follow water system JB/T2001.46-1999 standard, mainly by valve body (1), check unit (2), stop valve unit (3) and the formation such as pressure-detecting device (4) is connected, as shown in Figure 1, be a kind of combination function valve.Gas charging valve air inlet termination air compressor, via check unit and stop valve unit, inflates to high pressure tank by outlet end.The one-way flow characteristic of pressurized gas can be guaranteed in check unit, prevents pressurized gas reverse reflux in the situation that air compressor stops air feed.Stop valve unit can be in system cuts off gas holder and supply air line safely during out of service or maintenance.Pressure-detecting device comprises the pressure condition that pressure gauge can reflect current gas holder side more intuitively, is convenient to the maintenance management of system.
Because the working medium of gas charging valve is high pressure air, viscosity is low, requires valve to have higher sealing characteristics, and oil, the moisture in pressurized air is more simultaneously, and is being mingled with the granule foreigns such as the rust mud that generates in pipeline and iron filings.The check unit of current gas charging valve and the spool of stop valve unit, valve seat are all hard contact-type cone valve mouth structures, cone valve mouth is easy to be expressed to granular pattern impurity and wrecks at turn-off transient, directly affect the sealability of valve, cause the gas charging valve phenomenon that often leaks air, directly affect industrial production.
Summary of the invention
The utility model is for the low problem of granule foreign destructive characteristics in the anti-medium of current gas charging valve structure, structure to gas charging valve improves, provide a kind of and there is the features such as simple in structure, high life, rapid operation be convenient, be very suitable for high pressure air gas storage system, be especially applicable to the gas charging valve in the high pressure gas holder air supply unit pipeline of high-pressure water descaling system.
The technical solution of the utility model is:
A kind of gas charging valve, comprise valve body, check unit, stop valve unit and pressure-detecting device, the external air compressor of inlet end of valve body, pressurized air is via check unit and stop valve unit, outlet end by valve body is expelled to outside high pressure tank, it is characterized in that: described stop valve unit comprises valve rod, valve pocket and valve core case; Described valve pocket is set on described valve core case, and described valve rod stretches into the valve port of described valve core case through described valve pocket; On the inwall of the bottom of closing on described valve core case of described valve pocket, have annular groove; In described groove, inlay the first elastic seal ring is set; When the bottom of described valve rod enters the valve port of described valve core case through described the first elastic seal ring, the outer wall of described valve rod contacts and connects airtight formation elastic packing with described the first elastic seal ring.
Further, the technical solution of the utility model can also be:
The width of the notch of described groove is less than the width of described inside grooves.
Described check unit comprises spool and the valve seat coordinating with spool; Described check unit also comprises the second elastic seal ring of the ring-type arranging along the sidewall of the bottom of described spool, when the bottom of described spool enters the inverted cone valve port place of described valve seat, described spool and described valve seat form elastic packing by described the second elastic seal ring.
Gas charging valve of the present utility model has eliminated gas charging valve by arranging of first, second elastic seal ring because low, the easy impaired defect of the performance that in medium, the destruction of granule foreign is caused, in stop valve unit, form between valve rod and valve pocket and the elastic packing that forms spool and valve seat in check unit, under same working condition, gas charging valve of the present utility model has higher working life than conventional gas charging valve, and the workload of maintenance has obtained great reduction.It is more convenient, quick that maintain and replace easily damaged parts becomes, and is very suitable at high pressure air gas storage system, especially in the high pressure gas holder air supply unit pipeline of high-pressure water descaling system, applies.
Accompanying drawing explanation
Fig. 1 is the structural representation of the gas charging valve of prior art.
Fig. 2 is the structural representation of gas charging valve of the present utility model.
Description of reference numerals
1. valve body 2. valve seat 3. spool 4. spring 5. cushion block 6. gland nut 7. fittings body 8. attaching nut's 9. seal ring 10. valve rods 11. are removed 12. and are removed headstock 13. seal disc 14. valve pocket 15. valve core case 16. pressure-detecting device 17. seal ring 18. plug screw 19. second elastic seal ring 20. seal ring 21. nut 22. packing ring 23. seal ring 24. seal ring 25. seal ring 26. first elastic seal ring 27. seal ring 28. seal rings
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Gas charging valve of the present utility model as shown in Figure 2, comprise valve body 1, check unit, stop valve unit and pressure-detecting device 16, the external air compressor (not shown) of inlet end of valve body, pressurized air is via check unit and stop valve unit, and the outlet end by valve body is expelled to outside high pressure tank (not shown).
The structure of gas charging valve of the present utility model is mainly optimized improvement in the structure of check unit and stop valve unit, and guarantees that the outer Conncetion cimension of valve and traditional gas charging valve have interchangeability.
Wherein, stop valve unit comprises the coaxial valve rod in center 10, valve pocket 14 and valve core case 15; Valve pocket is set on valve core case, and valve rod stretches into the valve port of valve core case through valve pocket; On the inwall of the bottom of closing on valve core case of valve pocket, have annular groove, in groove, inlay the first elastic seal ring 26 is set; When the bottom of valve rod enters the valve port of valve core case through the first elastic seal ring, the outer wall of valve rod contacts and connects airtight with the first elastic seal ring, thereby forms elastic packing between valve rod and valve pocket.
In this example, between valve core case and valve pocket, passing through seal ring 27, between valve pocket and valve body, by seal ring 28, forming sealing.
The stop valve unit of the utility model structure is granule foreign destructive characteristics in the anti-medium of raising valve port, improve working life, retaining on the basis of hard contact seal valve port, increased the first seal ring 26 coordinating with valve rod, can guarantee when valve in off position, to there is soft or hard double-sealing effect.
In order to ensure the first elastic seal ring, in the medium of High Speed Turbulent, do not washed out, in this example, the width of the notch of groove is less than the width of inside grooves, be similar to semi-enclosed structure, therefore, the first elastic seal ring is different from general seal ring, it is that extruding is embedded in this groove, when valve opening state, in the first 26 of elastic seal rings medium being exposed to completely by valve, for holding the groove of the first elastic seal ring, to be designed to notch less than groove insied width.Can realize in the situation that does not reduce sealing effect, guarantee that the first elastic seal ring is not washed out, and reduce the impact of washing away.When leaving or penetrating the first elastic seal ring 26 when opening and closing operation in order to ensure valve rod, can not cause damage to the first elastic seal ring 26, the sealing valve port face of the bottom of valve rod and the appropriate design of the transition chamfering between stem guiding face have extremely important effect.The first elastic seal ring has to granule foreign the ability that necessarily comprises, lower to the receptance of working medium particle content, therefore relatively hard contact seal face valve port has longer working life.The endoporus that the seal action of the first elastic seal ring 26 needs the guide cylinder face of valve rod 10 to pierce into seal ring 26 completely could be realized, and the first elastic seal ring 26 opens or seal and need valve rod 10 to carry out certain displacement process could to realize.This can realize after hard sealing valve port has been opened enough apertures just has MEDIA FLOW to cross valve port, greatly reduces hard valve port by the risk of high speed medium erosion.The sealing effect in conjunction with hard valve port with zero leakage, and the strong feature of the contamination resistance of the first elastic seal ring 26, greatly reduce the valve low risk in working life causing because of valve port leakage.
In this example, check unit comprises the coaxial spool in center 3 and the valve seat 2 coordinating with spool; Check unit also comprises the second elastic seal ring 19 of the ring-type arranging along the sidewall of the bottom of spool, and when the bottom of spool enters the inverted cone valve port place of valve seat, spool and valve seat form elastic packing by the second elastic seal ring.
In this example, between valve seat and valve body, by seal ring 20, form sealing.
The utility model has increased by the second elastic seal ring 19 at the inverted cone valve port place of valve seat, air pressure when spool 3 valve port lower ends is not enough to overcome spool 3 upper end cavity air pressure to the active force of spool 3 and spring 4 thrusts to the active force of spool 3, under Action of Gravity Field, the valve port of check unit is closed.When spool 3 lower end cavitys reduce after air pressure reduction because of air feed, spool 3 is closely closed under the differential pressure of atmospheric pressure of two ends, and the air pressure of upper end forms one soft seal valve port except hard contact-type cone valve mouth at the bottom of the second elasticity elastic seal ring 19 is pressed into the seal groove of the cone valve mouth upper end that spool 3 and valve seat 2 form.Valve port just forms soft or hard double seal effect like this.Effectively guaranteed the sealability of the one-way valve of check unit.When the pressure of valve cavity of resorption is greater than upper cavity pressure, air pressure will overcome 3 deadweights of spring force and spool spool will upwards be pushed away valve open.
Above-mentionedly only the specific embodiment of the utility model is illustrated; but be not that protection domain of the present utility model is done to any pro forma restriction; every equivalence of making according to the design spirit in the utility model changes or modifies, and all should think and fall into protection domain of the present utility model.