CN2341521Y - Safety valve - Google Patents

Abstract

The utility model relates to a safety valve for a pressure cooker, which solves the problems that the authenticity of a fusible piece is difficult to be identified when the fusible piece is bought, and the steam exhaust channel of a common mechanical safety valve is narrow and tortuous and is easy to be blocked. The utility model is characterized in that the inner of a valve cavity is provided with at least two spacing pull rods and the corresponding locking columns; the position at the lower end of the spacing pull rods are three-point locked by utilizing the locking columns at the lower part of a self-locking sleeve; then, the upper hooks on each spacing pull rods can lock the position at the upper end of a spring; a valve core at the lower part of a locking block is provided with an unlocking trap deep groove which can cause the locking block to drop in; the spring pushes the valve core downwards under ordinary pressure, and the valve core is sealed. The valve has two-stage safety pressure, and when the second stage operates, unobstructed through decompression steam exhaust can be realized.

Description

Safety valve

The utility model relates to a kind of parts of pressure cooker, particularly a kind of safety valve.

For guaranteeing that when the work pressure limiting valve of pressure cooker is blocked pressure in the pot can not rise to the pressure that can make pressure cooker destruction and cause danger, and all takes to install the method for safety valve, guarantees safe in utilization.At present the structure of safety valve commonly used has: block up formula safety valve or after using one of them of meltable sheet style safety valve, standard machinery formula safety valve and rubber, in the fastening position perforate of the pot cover of pressure cooker, pot body or sealing ring or slit, promptly reduce its integral sealing intensity again.The method that meltable sheet style safety valve is installed is most economical and safe and reliable, but the meltable jam that this valve uses belongs to disposable special-purpose sheet, and after the damage, the user must arrive on the market and buy, and the sheet of having bought is difficult to distinguish true from false with commonsense method, thereby may cause serious consequence; Though standard machinery formula safety valve does not have the problems referred to above,, do not have the overvoltage steam discharge and guarantee purpose of safety because problems such as the ubiquity displacement is little, passage complications also might cause secondary to stop up; The rubber formula safety valve of blocking up uses inconvenient because of it and the technical parameter instability is eliminated by market; Reducing the sealing intensity of pressure cooker, come down to sacrifice the whole service life of pot, is a kind of method of passiveness.

It is big that the purpose of this utility model provides a kind of steam flow passage, has anti-blocking and secondary pressure release protection function, and when the action of pressure release for the second time takes place when, the safety valve that exhaust passage is bigger and straight-through.

The technical solution of the utility model is: it has valve body and nut is installed; There is valve seat lower end at valve body, and its top connects one from lock tube, and there is decoction cap self-locking cover top; At valve seat, in the inner common cavity that forms of lock tube and decoction cap spool is arranged, the working seal circle is equipped with in the lower end of spool, and the lower end of usual spool is pressed against the upper edge of center, valve seat lower end bottom outlet by the working seal circle, realizes sealing; The sealing force of spool comes from spring pressure; Spring is through on the spool, and the lower end is pressed on the cross section of cylinder with large diameter of spool middle and lower part, and the upper end withstands on stop collar or the pad, and the upper end of stop collar or pad withstands on its periphery again, lean against from the limit pull rod of lock tube inwall rise to the bait below; The top of spool is connected with decoction cap; At valve seat, from the formed inwall of lock tube, and between the periphery of spool, spring, stop collar or pad, minimum two limit pull rods are housed; The lower end of every limit pull rod is all passed out from lock tube or the corresponding axial groove on the locking pads of lock tube lower end; Below axial groove, each limit pull rod all has one downwards and the declivity hook at certain inclination angle is arranged, and adorns a locking column or piece on the inclined-plane that this hook makes progress; That is: the outer skew back below of each locking column or piece is pressed on the declivity hook of corresponding limit pull rod; The two ends of top withstand on the both sides, axial groove lower end in lock tube or both sides, corresponding axial groove lower end on the locking pads of lock tube lower end or corresponding radial guidance groove respectively, make it can not be upward through axial groove; Then lean against spool or be contained on the protection ring on the spool to valve body axle center face; When pot inner pressure is less than or equal to first safe pressure of this valve, by stop collar or pad, limit pull rod is under the effect of top power on the spring, its declivity hook will produce a power that makes progress, this masterpiece is used in the outer side-lower of locking column or piece, will make locking column or piece produce the component of both direction, that is: one vertically upward component and level to the component in valve body axle center; Its power vertically upward causes the top of locking column or piece to lean against from lock tube or on the locking pads of lock tube lower end, and locking column or piece can not be moved up; And parallel component to the axle center will cause locking column or piece to lean against on the spool or be contained on the protection ring in the spool outside; So the position of locking column or piece is by 3 lockings, by the interlock effect of limit pull rod and stop collar or pad, the position of spring upper end is also simultaneously locked, and spring has only downwards spool is applied sealing force; On the spool below locking column or the piece, be provided with a release trap deep trouth; At the middle part of valve seat, the outside top that screw thread is installed on the same section line, has the radial direction through hole that makes things convenient for steam discharge more than.

Stop collar or pad and limit pull rod are stressed evenly in order to make, action is stable, minimum in the inner chamber of lock tube two limit pull rods should be arranged, and the best is three, and a locking column or piece should be equipped with in the lower end of every limit pull rod; The blocked method in the top of the lower end of limit pull rod, locking column or piece has two kinds: the firstth, leaving from the bottom of lock tube and in the lock tube all-in-one-piece, encircling, on this ring, open the axial groove that limit pull rod is passed; The secondth, adorn an annular lock pad that leans against from the lock tube bottom, on the interior edge of locking pads, open the axial groove that limit pull rod is passed; The axial length of locking column or piece should be greater than the axial groove width; In order to make locking column or piece that axial float not take place, open a radial guidance groove again in the lower end of each axial groove, the width of radial guidance groove is greater than the axial length of locking column or piece; The top of each locking column or piece is withstood on from the both sides, lower end of lock tube or the corresponding axial groove on the locking pads of lock tube lower end, stop on it and move.

Protection ring should be made by the material of good springiness; The protection ring purpose is installed on spool has two: the one, increase near the material hardness of the spool contact-making surface of locking column or piece to reduce wearing and tearing and to improve sliding; The 2nd, in the outer radius of release trap deep trouth, by opening, cut methods such as open-minded, form one and can make locking column or piece can under the effect of pressure, be forced into release trap deep trouth, the unidirectional trap mouth that can not deviate from voluntarily again; The effect of this unidirectional trap mouth is when the pressure release of the second level of this valve is moved, and locking column or piece can be in the same place with spool, are unlikely to too little because of it, the bad searching in back outside the pot that flies out under the effect of air-flow.

For foreign matter in the pot that prevents bulk covers exhaust passage in the steam discharge course of action of this valve, leave a platform in the lower end of clamp nut, a cover is installed on this platform; This cover is the cover of processing through punching press, closing in, enlarging, crimping or hot-cast etc. with thin slice or silk netting, its shape can be cup-shaped, ware shape, hemispherical or circle the bottom of a pan shape etc., if use wafer processes, should have two above through holes in its body portion or body portion and bottom at least; It can be that live, dismountable or fixing that being connected between nut and Anti-stop cover is installed; Requirement to through hole is: the area in each hole must be less than the area at the minimum diameter place of valve seat, the porose gross area must be greater than the area at valve seat minimum diameter place.

The utility model should vertically or approximately perpendicular to horizontal plane be installed on the pot cover in use.It has the action of two-stage pressure release steam discharge, the first order is when the work pressure limiting valve of pressure cooker stops up, when pot inner pressure is elevated to the first pressure release starting pressure of safety valve, the bottom surface of the lower end of spool by working seal circle and spool is subjected to thrust upwards will overcome the pressure of spring to spool, spring is compressed, spool is with respect to moving on the valve seat, cause the sealing of both lower ends ineffective, gas enters valve pocket by the gap of valve seat and spool lower end, and then by the radial direction through hole of valve seat side with owing to move on the spool, after making decoction cap be lifted height, outside the slit dump valve that forms between decoction cap and locking cover is outside the pot, play maximum pressure in the restriction pot, guarantee effect safe in utilization; By steam discharge or close burning things which may cause a fire disaster when pressure in the pot is descended, the lower end of spool will reduce by the upwards thrust of the bottom surface generation of working seal circle and spool, when its less than spring during to the pressure of spool, the working seal circle is under the drive of spool, move down jointly and realize sealing once more, steam discharge stops automatically; The second level is that this valve is also stopped up by the foreign matter in the pot in first order pressure release steam discharge process, if fail in time to close burning things which may cause a fire disaster this moment, pot inner pressure will continue to raise, spool also will continue the compression spring and raise, when the below that is in locking column or piece, be located at release trap deep trouth on the spool when moving on to the contact position of locking column or piece on the spool, locking column or piece will be forced to fall into release trap deep trouth under the promotion of limit pull rod, limit pull rod has also just lost alignment restrictions simultaneously, under top power on the spring and acting in conjunction from pot inner pressure, limit pull rod, stop collar or pad, spring, part in the valve pockets such as spool, to break away from away from the upper end of this valve, form a straight-through exhaust passage; The diameter of bore that the minimum steam discharge bore of this passage is valve seat lower end sealing place.Because this valve is provided with Anti-stop cover on the installation nut, stop up this valve once more so the harder foreign matter bigger than this minimum aperture diameter can not occur, has guaranteed safe in utilization.

From its structural principle as can be known, the utility model can guarantee to be used to process the safe handling of those pressure cookers that contain more obstruction foreign matter or low capacity low pressure vessel.

Accompanying drawing 1 is the front view of the utility model appearance and modeling design;

Accompanying drawing 2 is front views of the utility model first embodiment;

Accompanying drawing 3 is front views of the utility model second embodiment;

Accompanying drawing 4 is front views of the utility model the 3rd embodiment;

Accompanying drawing 5 is front views of the utility model the 4th embodiment;

Accompanying drawing 6 is that the K of first and second embodiment of the utility model is to view;

Accompanying drawing 7 is that the K of first and second embodiment of the utility model is to view;

Accompanying drawing 8 is that the K of the utility model the 3rd embodiment is to view;

Accompanying drawing 9 is that the K of the utility model the 4th embodiment is to view;

Accompanying drawing 10 is A-A cutaway views of first and second embodiment of the utility model;

Accompanying drawing 11 is A-A cutaway views of first and second embodiment of the utility model;

Accompanying drawing 12 is A-A cutaway views of third and fourth embodiment of the utility model;

Accompanying drawing 13 is A-A cutaway views of third and fourth embodiment of the utility model;

Accompanying drawing 14 is B-B cutaway views of first, second, third and fourth embodiment of the utility model;

Accompanying drawing 15 is B-B cutaway views of first, second, third and fourth embodiment of the utility model;

Accompanying drawing 16 is B-B cutaway views of first, second, third and fourth embodiment of the utility model;

Accompanying drawing 17 is B-B cutaway views of first, second, third and fourth embodiment of the utility model.

Embodiment one:

Fig. 1 appearance and modeling global design scheme of embodiment one of having drawn, and enumerated a kind of appearance and modeling of Anti-stop cover 7; The structural relation that Fig. 2 has drawn when pot inner pressure is less than or equal to first safe pressure each part.Find out that from Fig. 1 or Fig. 2 valve seat 3 can be fastened on the pressure cooker cover 5 with the installation nut 6 of band Anti-stop cover 7, and the sealing ring 4 of installation is arranged between them; Above valve seat 3, be connected with from lock tube 2, decoction cap 1 arranged from the top of lock tube 2; As can be seen from Figure 2, at valve seat 3 with in lock tube 2 formed common cavity spool 11 is arranged, there is working seal circle 13 lower end of spool 11, and working seal circle 13 is pressed against on the upper edge 33 of valve seat 3 center bottom outlets 26; The sealing force of spool 11 comes from the pressure of spring 10; Spring 10 is through on the spool 11, and the lower end of spring 10 is pressed on the cross section 36 of middle and lower part cylinder with large diameter of spool 11, and the top withstands on the stop collar 9; Decoction cap 1 is connected with the top of spool 11; In the periphery and the valve pocket between lock tube 2, valve seat 3 of spring 10 and stop collar 9, two or three limit pull rods 8 are arranged, rising to the bait of each limit pull rod 8 27 all hangs on the stop collar 9; Find out from Figure 10 or Figure 14 or Figure 16 two limit pull rods 8 are housed; Find out from Figure 11 or Figure 15 or Figure 17 and also can adorn three limit pull rods 8; Relatively Figure 10 and Figure 11 as can be seen, 27 the width of rising to the bait of limit pull rod 8 can suitably be widened, and also can not widen; Find out that from Figure 14 or Figure 15 the cross section of limit pull rod 8 is quadrangles, find out that from Figure 16 or Figure 17 the cross section of limit pull rod 8 also can be circular; As can be seen from Figure 2 have one and from the interior ring 28 of lock tube 2 one from the lower end of lock tube 2, find out on this ring from Fig. 6 or Fig. 7, corresponding every limit pull rod 8, all have the axial groove 29 that each limit pull rod 8 is passed, above the declivity hook 30 of each axial groove 29 lower end and corresponding limit pull rod 8, all there is an axis normal radially in valve seat 3, the locking column 12 of horizontal positioned, this also can be as can be seen from Figure 2; Can find out also that from Fig. 6 or Fig. 7 the axial length L of locking column 12 is greater than the width H of axial groove 29, so locking column 12 can not pass axial groove 29; As can be seen from Figure 6 locking column 12 is cylinders, and as can be seen from Figure 7 locking column 12 also can be a dumb-bell shape; Again as can be seen from Figure 2, since spool 11 stop that locking column 12 can not move freely by horizontal radial; Thereby the declivity hook 30 of limited pull bar 8 lower ends, the position of locking column 12, unite locking from the interior ring 28 and spool 11 threes of lock tube 2; By the interlock of limit pull rod 8, stop collar 9, the position of spring 10 upper ends is simultaneously locked, and spring 10 has only downwards exerts pressure to spool 11, and sealing is realized in the upper edge 33 of the center bottom outlet 26 by working seal circle 13 and valve seat 3; Find out from Fig. 1 or Fig. 2, having all several radial direction through hole 32 on the same section line above the valve seat 3 installation screw threads 31; When pot inner pressure acts on the bottom 38 of spool 11 and the power on the working seal circle 13 greater than the pressure of spring 10, spring 10 only is compressed, cause moving on the spool 11, working seal circle 13 loses sealing function, and the radial direction through hole 32 of steam by the gap between the upper edge 33 of the center bottom outlet 26 of working seal circle 13 and valve seat 3, valve insertion and valve seat 3 etc. is discharged to valve outward promptly outside the pot in the pot; As can be seen from Figure 2, on the spool below the locking column 12 11, have and to hold the release trap deep trouth 34 of going into locking column 12; When this valve in first order steam discharge process, if exhaust passage is also blocked, pot inner pressure is under the effect of thermal source, to continue to rise, spool 11 will move on also will continuing, below being positioned at locking column 12, drive release trap deep trouth 34 on spool 11 when moving on to the contact position of locking column 12 on the spool 11, locking column 12 will be under the promotion of the declivity hook 30 of limit pull rod 8, be forced to fall into release trap deep trouth 34, limit pull rod 8 has also lost alignment restrictions simultaneously, under top power on the spring 10 and acting in conjunction from pot inner pressure, limit pull rod 8, stop collar 9, spring 10, spool 11, part Deng in the valve pocket will break away from away from the upper end of this valve, forms a straight-through exhaust passage; The appearance and modeling of Anti-stop cover 7 is the cup-shaped of slightly closing in and crimping as can be seen from Figure 1, and periphery has strip through hole 35; As can be seen from Figure 2 Anti-stop cover 7 also is cup-shaped, but depth ratio Anti-stop cover 7 shown in Figure 1 is dark, does not have and closes up and crimping, combines with installation nut 6 by spinning, and non-dismountable, periphery has two exhausting holes 35.

Embodiment two:

What Fig. 3 drew also is the structural relation of each part when pot inner pressure is less than or equal to first safe pressure.The difference of it and embodiment one has following 4 points: change former stop collar 9 into spacing pad 14 1.; 2. the steady pad 15 of locking is arranged in the lower end from lock tube 2; 3. change former locking column 12 into clamping block 16, as can be seen from Figure 6 clamping block 16 is prisms, and as can be seen from Figure 7 clamping block 16 also can be a dumb-bell shape; 4. Anti-stop cover 7 also can be a flat ware shape, close up but crimping arranged, oral area with screw thread with nut 6 be installed be connected, can pull down, through hole 35 is all arranged at peripheral and bottom.In addition, other structures are identical with embodiment one, are not described in detail in this.

Embodiment three:

What Fig. 4 drew also is the structural relation of each part when pot inner pressure is less than or equal to first safe pressure.The difference of it and embodiment one has following 7 points: 1. decoction cap 1 uses nonmetallic materials to make; 2. change former stop collar 9 into spacing steady cover 17, periphery at spacing steady cover 17, open the corresponding axial groove 40 that limit pull rod 8 is passed, this can be as can be seen from Figure 8, each limit pull rod 8 rise to the bait 27 be upward through corresponding axial groove 40 after, hang over the upper end of spacing steady cover 17, two limit pull rods 8 as can be seen from Figure 12 are housed, as can be seen from Figure 13 also can adorn three limit pull rods 8; 3. in the lower end 39 of each axial groove 29 of ring on 28 in lock tube 2, the radial guidance groove 37 of the fixed column 12 of unblanking, this can be as can be seen from Figure 8; As can be seen from Figure 8, the width P of radial guidance 37 is greater than the axial length L of locking column 12, and purpose is the axial float of restriction locking column 12; 4. in the lower end of release trap deep trouth 34, little protection ring 20 is arranged, effect is when second level pressure release action takes place, and only allows locking column 12 to be forced into release trap deep trouth 34 under external force, and can not deviate from voluntarily after it enters; 5. for convenient little protection ring 20 is installed, with former spool 11 separated into two parts, that is: upper valve core 18 and bottom spool 19; 6. cancel former working seal circle 13, at the lower end of bottom spool 19 and valve seat 3 between the two, contact sternly with the sideline, upper edge 42 of the bottom cone 41 of spool 11 and valve seat 3 center bottom outlets 26 and to close, realize sealing; 7. as can be seen from Figure 4, Anti-stop cover 7 also can be a spherical shell shape, combines with nut 6 is installed by spinning, and is non-dismountable, and two exhausting holes 35 are arranged on the sphere of bottom.In addition, other structures are identical with embodiment one, are not described in detail in this.

Embodiment four:

What Fig. 5 drew also is the structural relation of each part when pot inner pressure is less than or equal to first safe pressure.It has following 6 points with the difference of embodiment one: 1. decoction cap 1 uses nonmetallic materials to make, and is inlaid with stiffnut 21; 2. change former stop collar 9 into spacing big cover 22, great circle periphery at spacing big cover 22, open the corresponding axial groove 40 that limit pull rod 8 is passed, this also can find out from Figure 12 or 13, each limit pull rod 8 rise to the bait 27 be upward through corresponding axial groove 40 after, hang over the upper end of spacing big cover 22, two limit pull rods 8 as can be seen from Figure 12 are housed, as can be seen from Figure 13 also can adorn three limit pull rods 8; 3. in lower end locking pads 23 is arranged from lock tube 2; 4. adorn big protection ring 24 in the lower end of spool 11,, answer perforate and open-minded, make locking column 12 can be forced into release trap deep trouth 34, but can not deviate from voluntarily at the position that covers release trap deep trouth 34; 5. on the dress cover platform 43 of the lower end that nut 6 is installed screw socket pin 25 is arranged, its minimum number should have two, evenly distributes; 6. as can be seen from Figure 5, Anti-stop cover 7 is cup-shaped through enlarging, utilizes to be fixed on the screw socket pin 25 installed on the nut 6 dress cover platforms 43 and to open suitable other cause for gossip at the correspondence position of Anti-stop cover 7 and now be connected, and detachable, periphery has through hole 35.In addition, other structures are identical with embodiment one, are not described in detail in this.

Claims (10)

1. safety valve, it has valve body and nut is installed, and it is characterized in that: there is valve seat the lower end at valve body, and its top connects one from lock tube, from the top of lock tube decoction cap is arranged; At valve seat, in the inner common cavity that forms of lock tube and decoction cap, spool is arranged, the lower end dress working seal circle of spool, the lower end of usual spool is pressed against the upper edge of center, valve seat lower end bottom outlet by the working seal circle, and the sealing force of spool derives from spring pressure; Spring is through on the spool, and the lower end of spring is pressed on the cross section of cylinder with large diameter of spool middle and lower part, and the top withstands on stop collar or the pad, and the upper end of stop collar or pad withstands on its periphery again, lean against from the limit pull rod of lock tube inwall rise to the bait below; The top of spool is connected with decoction cap; At valve seat, from the formed inwall of lock tube, and between the periphery of spool, spring, stop collar or pad, minimum two limit pull rods are housed; The lower end of every limit pull rod is all passed out from lock tube or the corresponding axial groove on the locking pads of lock tube lower end; Below axial groove, each limit pull rod all has one downwards and the declivity hook at certain inclination angle is arranged, and adorns a locking column or piece on the inclined-plane that this hook makes progress; That is: the outer skew back below of each locking column or piece is pressed on the ramp of corresponding limit pull rod declivity hook; The two ends of top withstand on the both sides, axial groove lower end in lock tube or both sides, corresponding axial groove lower end on the locking pads of lock tube lower end or corresponding radial guidance groove respectively, make it can not be upward through axial groove; Then lean against spool or be contained on the protection ring on the spool to valve body axle center face; So the position of locking column or piece is by 3 lockings, by the interlock of limit pull rod and stop collar, the position of spring upper end is also simultaneously locked; On the spool below locking column or the piece, have a release trap deep trouth; At the middle part of valve seat, the outside screw thread top of installing on the same section line, has an above radial direction through hole.

2. safety valve according to claim 1 is characterized in that: after it is installed on pressure cooker or other low pressure vessels, and the shape of extending part, valve body part is cylindrical, and the valve top is spherical in shape, taper shape or truncated cone, natural between the two smooth connection; On the same section line of cylindrical side middle and lower part, have an above radial direction through hole.

3. safety valve according to claim 1 and 2, it is characterized in that: install one in its lower end that nut is installed and make of thin slice or silk netting, its shape is cup-shaped, ware shape or circle the bottom of a pan shape, has the Anti-stop cover of two above through holes in its body portion or body portion and bottom; It can be that live, dismountable or fixing that being connected between nut and Anti-stop cover is installed.

4. safety valve according to claim 1 and 2 is characterized in that: on the spool below locking column or the piece, have a release trap deep trouth that locking column or piece are entered; Periphery at groove can be with or without protection ring.

5. safety valve according to claim 1 and 2 is characterized in that: the shape of locking column or piece is cylinder, prism or dumb-bell shape.

6. safety valve according to claim 1 and 2 is characterized in that: spool can be an integral body, also can be combined by upper valve core and two parts of bottom spool.

7. safety valve according to claim 1 and 2, it is characterized in that: leaving one and from the bottom of lock tube from the interior ring of lock tube one, on ring, open the axial groove that limit pull rod is passed, or adorning an annular lock pad from the bottom of lock tube, the upper end of locking pads leans against the lower end from lock tube, on the interior edge of locking pads, open the axial groove that limit pull rod is passed, and the axial length that makes locking column or piece is greater than this width of rebate; The radial guidance groove be opened or do not opened in lower end at axial groove can again, and the width of guide-track groove is greater than the axial length of locking column or piece.

8. safety valve according to claim 1 and 2 is characterized in that: decoction cap can adopt metal or nonmetal making, and the junction of itself and spool can be inlayed or not inlay the stiffnut cover or be strengthened screw column.

9. safety valve according to claim 1 and 2 is characterized in that: the cross section at arbitrary position of each limit pull rod can be circle, ellipse, triangle, quadrangle or polygon.

10. safety valve according to claim 1 and 2 is characterized in that: the sealing means of valve seat and spool adopts O shape circle, plain cushion or machinery sternly to close.

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