Pulse safety valve
Technical field
The invention belongs to field of mechanical technique, relate to hydraulic equipment, especially relate to a kind of pulse safety valve.
Background technique
In hydraulic system, if pressure is excessive and can cause the damage of component when surpassing limit value, thereby cause hydraulic system to break down, even bury potential safety hazard.For this reason, people carry out long-term exploration, have proposed various technological schemes.In hydraulic pipe line pulse safety valve being installed is effective a kind of method.Thereby pulse safety valve is the pressure that can discharge hydraulic pipe line when pressure surpasses limit value realizes protection.
For example, Chinese patent literature discloses a kind of air whistle safety valve [application number: CN94229914.0] of reporting to the police automatically, its base and socket and on pressure regulating cover with being threaded, overcoat is loaded onto the protecting cover of peripheral tool through hole, the pressure regulating cover crimping of spring and tool sounder slotted eye and boss of valve gap top, be plugged with the birdie sounder on its slotted eye, the valve gap on the valve port is glass marble, flare nut or flat board etc.In case through valve port, emptying pressure release, gas is created in the chimes of doom that all may hear in hundred meters through zufolo automatically for superpressure, gas, so safe and reliable.Be adapted to be mounted within on the various gas pipelines or with supporting uses such as pressure regulator valve, bell jar suction valve.The somebody has invented a kind of deadweight safety valve [application number: CN200420015636.5] that adopts steel ball as closure member, cancelled the taper closure member, self-aligning, the hydraulic pulsation formula safety valve basic structure of this steel ball oil sealing comprises: valve gap, spool, pressure-adjusting spring and piston that valve core cavity is provided with, it is characterized in that: valve core cavity is provided with steel ball.
Therefore though such scheme has improved safe working stability to a certain extent, still exist following technical problem: 1, can't point out when being in the pressure release state, be difficult to the potential faults of finding that in time system may exist, Security is relatively poor.2, be difficult to the voltage limiting value size is adjusted, also exist the loaded down with trivial details problem of operating process even if can realize pressure regulation, Applicable scope is less.3, sealing is relatively poor, is easy to occur the seepage situation, and spool is easy to occur cheap, and working stability is difficult to be protected.
Summary of the invention
The objective of the invention is at the problems referred to above, provide a kind of and when pressure release, can sound, possess the pulse safety valve of prompt facility.
For achieving the above object, the present invention has adopted following technical proposal: this pulse safety valve, comprise valve body, this valve body has feed pathway and pressure release passage, it is characterized in that, described feed pathway internal fixation has the valve seat with liquid-through hole, in valve body, be provided with needle and the spring that acts on the needle, described needle is between feed pathway and pressure release passage, the front end of this needle can insert under acting force of the spring in the liquid-through hole of valve seat and with the liquid-through hole shutoff, is being provided with the vocal structure that can sound under the fluid effect when needle overcomes acting force of the spring and makes liquid-through hole be on state under hydrodynamic pressure between needle and the valve body.
Owing to be provided with vocal structure, when being in the pressure release state, can in time point out, thereby improve Security and the reliability used greatly.On the other hand, needle has good leading role when inserting in the liquid-through hole of valve seat, and needle is departed from, so good operating stability.
In above-mentioned pulse safety valve, described vocal structure comprises the bulge loop of being located on the needle, and the external diameter and the valve block internal diameter of this bulge loop adapt.
During work, highly pressurised liquid acts on and makes it to produce the active force that the liquid-through hole movement tendency is left in the generation of promotion needle on the needle.When this active force during less than the active force of spring, liquid-through hole is in closed state; When this active force during greater than the active force of spring, needle leaves liquid-through hole, highly pressurised liquid moment impact needle bulge loop, and promote needle once more and move, overflow from pressure release passage until liquid.When highly pressurised liquid impacts bulge loop, will produce sound with suggesting effect.After pressure release, the active force of spring is greater than the active force of highly pressurised liquid to needle, and at this moment, needle resets, and finishes the overflow of once pulsing.When high-pressure and hydraulic was able to overcome acting force of the spring to the active force of needle once more, pressure release once more and so forth, realized the pulsed pressure release.On the other hand, bulge loop can effectively improve the stability that cooperates between needle and the valve body, makes needle to avoid occurring rocking swimmingly along moving axially.
In above-mentioned pulse safety valve, the front end of described needle has the conical surface that can form sealing with liquid-through hole.Conical surface has better sealing effect, and can effectively improve the stability of needle work.
In above-mentioned pulse safety valve, described pressure release passage is arranged on the middle part of valve body, and when the front end of needle during with the liquid-through hole shutoff, bulge loop is with the pressure release passage shutoff, and when liquid-through hole was on state, bulge loop separated with pressure release passage.
In above-mentioned pulse safety valve, described pressure release passage has several, and each pressure release passage is provided with on the same circumference.
In above-mentioned pulse safety valve, be provided with sealing configuration between described needle and the valve body.Owing to be provided with sealing configuration, can effectively improve the sealing between needle and the valve body, guarantee proper functioning.
In above-mentioned pulse safety valve, described sealing configuration comprise the circular groove that is arranged on the needle and be arranged in the circular groove and with valve interior wall against inner seal ring.Circular groove can be realized the axially locating of inner seal ring on needle.
In above-mentioned pulse safety valve, described valve body is provided with the regulation structure that can adjust the acting force of the spring size.Owing to be provided with regulation structure, can adjust voltage limiting value easily, thereby improve the flexibility that the present invention uses greatly, enlarged using scope.
In above-mentioned pulse safety valve, described regulation structure comprises adjustable column and the adjustment hole of opening on valve body, and described adjustable column is connected by worm structure with adjustment hole, and on the end effect adjustable column of described spring, the other end acts on the needle.
When rotating adjustable column, adjustable column is moved axially with respect to valve body, thereby change the reduction length of spring, realize the adjusting of acting force of the spring.The length of spring is short more, and voltage limiting value is big more, and the length of spring is long more, and voltage limiting value is more little.
In above-mentioned pulse safety valve, described valve body arranged outside has connecting thread, is provided with outer groove in a side of connecting thread, is provided with exterior seal ring in outer groove.
Compared with prior art, the advantage of this pulse safety valve is: 1, owing to be provided with vocal structure, can sound when pressure release, possess prompt facility, improve the Security of using greatly.2, can regulate expansion Applicable scope easily to the voltage limiting value size.3, can guarantee the sealing of valve body, can both guarantee sealing when making pulse safety valve work in different voltage limiting values, improve working stability.
Description of drawings
Fig. 1 is the structural representation when being in cut-off state provided by the invention.
Fig. 2 is the structural representation when being in the pressure release state provided by the invention.
Among the figure, valve body 1, feed pathway 11, pressure release passage 12, adjustment hole 13, connecting thread 14, outer groove 15, valve seat 2, liquid-through hole 21, needle 3, bulge loop 31, conical surface 32, circular groove 33, spring 4, inner seal ring 5, adjustable column 6, exterior seal ring 7.
Embodiment
As illustrated in fig. 1 and 2, this pulse safety valve comprises valve body 1, and this valve body 1 has feed pathway 11 and pressure release passage 12.Feed pathway 11 internal fixation have the valve seat 2 with liquid-through hole 21, are provided with needle 3 and the spring 4 that acts on the needle 3 in valve body 1.Needle 3 is between feed pathway 11 and pressure release passage 12.Valve body 1 arranged outside has connecting thread 14, is provided with outer groove 15 in a side of connecting thread 14, is provided with exterior seal ring 7 in outer groove 15.
The front end of needle 3 can insert under spring 4 active forces in the liquid-through hole 21 of valve seat 2 and with liquid-through hole 21 shutoff.The front end of needle 3 has the conical surface 32 that can form sealing with liquid-through hole 21.
Be provided with the vocal structure that when needle 3 overcomes spring 4 active forces and makes liquid-through hole 21 be on state under hydrodynamic pressure, can under the fluid effect, sound between needle 3 and the valve body 1.Vocal structure comprises the bulge loop of being located on the needle 3 31, and the external diameter of this bulge loop 31 and valve body 1 internal diameter adapt.Pressure release passage 12 is arranged on the middle part of valve body 1, and when the front end of needle 3 during with liquid-through hole 21 shutoff, bulge loop 31 is with pressure release passage 12 shutoff, and when liquid-through hole 21 was on state, bulge loop 31 separated with pressure release passage 12.Pressure release passage 12 has several, and each pressure release passage 12 is provided with on the same circumference.
Be provided with sealing configuration between needle 3 and the valve body 1.Sealing configuration comprise the circular groove that is arranged on the needle 3 33 and be arranged in the circular groove 33 and with valve body 1 inwall against inner seal ring 5.
Valve body 1 is provided with the regulation structure that can adjust spring 4 amount of force.Regulation structure comprises adjustable column 6 and opens adjustment hole 13 on valve body 1, and described adjustable column 6 and adjustment hole 13 are connected by worm structure, and on the end effect adjustable column 6 of described spring 4, the other end acts on the needle 3.
During work, highly pressurised liquid acts on and makes it to produce the active force that liquid-through hole 21 movement tendencies are left in 3 generations of promotion needle on the needle 3.When this active force during less than the active force of spring 4, liquid-through hole 21 is in closed state; When this active force during greater than the active force of spring 4, needle 3 leaves liquid-through hole 21, the bulge loop 31 of highly pressurised liquid moment impact needle, and promote needle 3 once more and move, overflow from pressure release passage 12 until liquid.When highly pressurised liquid impacts bulge loop 31, will produce sound with suggesting effect.After pressure release, the active force of spring 4 is greater than the active force of highly pressurised liquid to needle 3, and at this moment, needle 3 resets, and finishes the overflow of once pulsing.When high-pressure and hydraulic was able to overcome spring 4 active forces once more to the active force of needle 3, pressure release once more and so forth, realized the pulsed pressure release.On the other hand, bulge loop 31 can effectively improve the stability that cooperates between needle 3 and the valve body 1, makes needle 3 to avoid occurring rocking swimmingly along moving axially.
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as valve body 1, feed pathway 11, pressure release passage 12, adjustment hole 13, connecting thread 14, outer groove 15, valve seat 2, liquid-through hole 21, needle 3, bulge loop 31, conical surface 32, circular groove 33, spring 4, inner seal ring 5, adjustable column 6, exterior seal ring 7 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.