Summary of the invention
The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a kind of multistage pressure leading gasPressure reducer.
In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions:
A kind of multistage pressure leading gas pressure reducer of the present invention, including shell, one upper lateral part of shell install first handle,The first pressure spring is installed in the downside of first handle, and case inside is located at the first pressure spring lower part and installs diaphragm, under diaphragmMandril is installed in portion, and case inside, which is located at mandril, opens up flow cavity, and the first valve seat is installed in the lower part that case inside is located at mandril, theThe first spool is installed in the inside of one valve seat, and another upper lateral part of shell installs second handle, and the lower part installation second of second handle is adjustedPressing spring, case inside are located at the lower part installation baffle of the second pressure spring, and film is installed in the lower part that case inside is located at bafflePiece, case inside are located at the lower part setting nozzle of upper diaphragm, and enclosure interior is located at nozzle side and opens up feedback duct, case insideLower diaphragm is set positioned at nozzle lower part, case inside is located at lower diaphragm lower part and the second valve seat, the inside installation of the second valve seat is arrangedSecond spool, lower part of the housing are located at the first valve seat side and open up level-one arrival end, and level-one arrival end is communicated with the first spool, shellLower part opens up air channel between the first spool and the second spool, and lower part of the housing is located at the second spool side and opens up secondary exit portEnd, secondary exit port end is communicated with the second spool.
In order to further realize the purpose of the present invention, following technical scheme can also be used: first valve seat and firstFirst balanced seal circle is set between spool.Second balanced seal circle is set between second valve seat and the second spool.
The present invention has the advantages that the present invention is ultralow pressure 0.04MPa ± 3% using pressure, and precision is higher, systemSuccess or failure have second depressurized decision, general pressure reducer is difficult to realize keep out under the conditions ofs harsh environment temperature, vibration etc.The stability of mouth pressure.The invention second-level inner guide balance type structure increases than level-one direct acting balance type structure as shown in Figure 1Nozzle, serial number, the nozzle of fixed orifice composition and baffle highly sensitive amplifying element.When between nozzle and baffle away fromIt when from small variation occurs, will make air chamber pressure that apparent variation occur, after upper diaphragm and lower diaphragm experience pressure, lead toCrossing feedback duct causes diaphragm and lower diaphragm to have biggish displacement, to go moving up and down for the second spool of control, makes the second valveCore is opened big or is turned down, and the sensitivity to spool control, intrinsic higher regulation precision are improved.This internal pilot balanced type knotStructure, when admission pressure variation is ± 0.1MPa, outlet pressure changes less than 0.5%；When rate of discharge is in 5%~100% modelWhen enclosing interior fluctuation, outlet pressure changes less than 0.5%.And the pressure reducer outlet pressure variation of conventional direct dynamic structure is greater than5%~10%, therefore, such present invention is a kind of high-accuracy type pressure reducer.The present invention also have it is simple for structure it is compact, manufacture atThis is cheap and uses easy advantage.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the inventionIt applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural diagram of the present invention.
Mark explanation: 12 first pressure spring of first handle, 3 diaphragm, 4 mandril, 5 first valve seat, 6 first spool 7 streamDynamic 8 first balanced seal circle of chamber, 9 air channel, 10 fixed orifice, 11 12 second pressure spring of second handle, 13 baffle 1415 nozzle 16 of upper diaphragm feeds back lower 18 second valve seat of diaphragm, 19 second spool, the 20 second balanced seal circle 21 1 in duct 1722 secondary exit port end of grade arrival end, 23 shell.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described hereinApply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
A kind of multistage pressure leading gas pressure reducer, as shown in Figure 1, including shell 23, the installation of 23 1 upper lateral part of shellFirst handle 1, the downside of first handle 1 install the first pressure spring 2, are located at 2 lower part of the first pressure spring on the inside of shell 23 and pacifyDiaphragm 3 is filled, the lower part of diaphragm 3 installs mandril 4, is located at mandril 4 on the inside of shell 23 and opens up flow cavity 7, be located on the inside of shell 23The first valve seat 5 is installed in the lower part of mandril 4, and the first spool 6 is installed in the inside of the first valve seat 5, another upper lateral part of shell 23 installation theTwo handles 11, the lower part of second handle 11 are installed the second pressure spring 12, are located under the second pressure spring 12 on the inside of shell 23Baffle 13 is installed in portion, and upper diaphragm 14 is installed in the lower part that baffle 13 is located on the inside of shell 23, is located at upper diaphragm 14 on the inside of shell 23Nozzle 15 is arranged in lower part, and shell 23 is internally located at 15 side of nozzle and opens up feedback duct 16, is located under nozzle 15 on the inside of shell 23Lower diaphragm 17 is arranged in portion, lower 17 lower part of diaphragm is located on the inside of shell 23, the second valve seat 18, the inside installation of the second valve seat 18 is arrangedSecond spool 19,23 lower part of shell are located at 5 side of the first valve seat and open up level-one arrival end 21, level-one arrival end 21 and the first spool6 communicate, and 23 lower part of shell opens up air channel 9 between the first spool 6 and the second spool 19, and 23 lower part of shell is located at the second valve19 side of core opens up secondary exit port end 22, and secondary exit port end 22 is communicated with the second spool 19.First valve seat 5 and the first spoolFirst balanced seal circle 8 is set between 6.Second balanced seal circle 20 is set between second valve seat 18 and the second spool 19.
At work, level-one arrival end 21 is passed through the bleed pressure of P1=40MPa to the present invention, rotational handle 1 slowly, adjustsPressing spring 2 is compressed, and pushes mandril 4 to move downward spool 6 and 5 sealing surfaces of lifting off a seat are to certain Lift, high pressure gasWhen body flows through the gap between 5 sealing surface of the first spool 6 and the first valve seat, a part of pressure energy, the pressure drop of gas are had lostAs low as achieving the purpose that decompression.
Then, the gas flow flow cavity 7 after pressure reduction, diaphragm 3 experience pressure, at the same with 2 phase of the first pressure springBalance, achievees the purpose that pressure stabilizing.Meanwhile the gas after pressure reduction is after 6 centre bore of the first spool reaches 6 lower part of the first spoolThe counteracted by pressure a part at 8 both ends of the first balanced seal circle, reduces and changes the inclined of gas outflow pressure because of gas pressure fluctuationDifference achievees the purpose that equalization vent pressure, and then improves the precision of voltage regulation.
After the gas depressurized by the first spool 6 is by entering air channel 9, it is divided into two-way: all the way through the second spool 19Gap to secondary exit port end 22 between the second valve seat 18；Another way enters intermediate gas through fixed orifice fixed orifice 10Room feeds back to lower chamber through nozzle 15, baffle 13 and feedback duct 16.When rotating clockwise second handle 11, the second pressure regulation bulletSpring 12 is compressed to certain position, and making the spacing of nozzle 15 and baffle 13, the second spool 19 enters work shape in working rangeState.The pressure of middle gas chamber increases with the reduction of spacing, lower diaphragm 17 experience pressure and push the second spool 19 downward away fromThe certain Lift of second valve seat, 18 sealing surface, low-pressure gas flow through the seam between 18 sealing surface of the second spool 19 and the second valve seatWhen gap, a part of pressure energy is had lost, the pressure reduction of gas achievees the purpose that decompression to lower degree.
Then, the gas after decompression arrives upper chamber through feedback duct 16 feedback, and upper diaphragm 14 experiences pressure and the second pressure regulationThe spring force of spring 12 balances each other, and achievees the purpose that pressure stabilizing.When input gas pressure fluctuates, nozzle 15 and baffle 13 are leaned onThe amplification and force balance principle stabilization of export pressure of amplifying element remain unchanged.If 21 gas pressure of level-one arrival end is instantaneousIt increases, 22 gas pressure of secondary exit port end also increases.The raising of 22 gas pressure of secondary exit port end will make air chamber pressure also successiveIt increases, and baffle 13 is made to move up a slight distance in company with upper diaphragm 14, and air chamber pressure is caused significantly to decline, make the second valveCore 19 is moved up in company with lower diaphragm 17, until the oral area of the second spool 19 turns down, declines 22 pressure of secondary exit port end, and steadyIt is fixed to arrive originally numerically.Similarly, if secondary exit port end 22 instantaneously declines, the amplification through nozzle 15, baffle 13 can also cause gasChamber pressure significantly increases, and moves down the second spool 19, and the oral area of the second spool 19 is opened greatly, and 22 pressure of secondary exit port end is madeRise, and be stabilized to original numerically, achievees the purpose that pressure stabilizing.It is rung in short, air chamber pressure forms a closed loop by feedback ductIt answers, to stablize the size of 22 gas pressure of secondary exit port end.
The present invention is ultralow pressure 0.04MPa ± 3% using pressure, and precision is higher, and the success or failure of system have second depressurizedIt determines, general pressure reducer is difficult to realize keep the stability of outlet pressure under the conditions ofs harsh environment temperature, vibration etc..ByThe invention second-level inner guide balance type structure known to Fig. 1 increases nozzle 15 than level-one direct acting balance type structure, serial number 13, consolidatesDetermine the nozzle of the composition of throttle orifice 10 and the highly sensitive amplifying element of baffle.When the generation of the distance between nozzle and baffle is smallWhen variation, it will make air chamber pressure that apparent variation occur and pass through feedback hole after upper diaphragm 14 and lower diaphragm 17 experience pressureRoad 16 causes diaphragm 14 and lower diaphragm 17 to have biggish displacement, to go moving up and down for the second spool 19 of control, makes the second valveCore 19 is opened big or is turned down, and the sensitivity to spool control, intrinsic higher regulation precision are improved.This internal pilot balanced typeStructure, when admission pressure variation is ± 0.1MPa, outlet pressure changes less than 0.5%；When rate of discharge is 5%~100%In range when fluctuation, outlet pressure changes less than 0.5%.And the pressure reducer outlet pressure variation of conventional direct dynamic structure is greater than5%~10%, therefore, such present invention is a kind of high-accuracy type pressure reducer.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be usedTo modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the inventionWithin protection scope.