CN100380033C - Back-pressure balancing minimum pressure valves - Google Patents
Back-pressure balancing minimum pressure valves Download PDFInfo
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- CN100380033C CN100380033C CNB031402259A CN03140225A CN100380033C CN 100380033 C CN100380033 C CN 100380033C CN B031402259 A CNB031402259 A CN B031402259A CN 03140225 A CN03140225 A CN 03140225A CN 100380033 C CN100380033 C CN 100380033C
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- 230000000694 effects Effects 0.000 claims description 14
- 210000000664 rectum Anatomy 0.000 description 6
- 230000002153 concerted effect Effects 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The present invention discloses a backpressure balance type minimum pressure valve, which is usually used for an air passage system of a gas compressor. The present invention comprises a valve body (1), an air inlet cavity channel (a), an air outlet cavity channel (b), a pilot valve (2), a piston (5) and a piston restoring spring (6). The present invention is characterized in that the present invention also comprises a close backpressure cavity (e); the backpressure cavity (e) and the air inlet cavity channel (a) are respectively positioned on both sides of the piston (5); the backpressure cavity (e) is communicated with the air inlet cavity channel (a) by a passage. The backpressure cavity has the action for balancing partial force acting on the piston to reduce the force on the piston restoring spring, and thereby, the service life of the spring is increased, the external dimensions and the weight of the spring and the minimum pressure valve are reduced, the comprehensive performance of the minimum pressure valve is enhanced, etc. Compared with the prior art, the present invention has the advantages of long service life, small size, large flow rate, good performance, etc.
Description
Technical field
The present invention relates to a kind of minimum pressure valve, be usually used in the air-channel system of gas compressor.
Background technique
Minimum pressure valve is extensive use of in the gas compressor industry, its main effect has two: the one, make after the compressor start immediately externally air feed, preferentially set up the required circulating pressure of lubricating fluid, guarantee the lubricated of compressor, when gas pressure reaches setting pressure, minimum pressure valve is just opened, outside air feed, otherwise minimum pressure valve is closed condition; The 2nd, when air compressor stopped air feed, minimum pressure valve played pilot valve, prevented gas backstreaming.
The pressure minimum valve arrangement of existing effect as shown in Figure 1 and Figure 2 in the gas compressor industry, Fig. 1 is the single piston reset spring minimum pressure valve of small flow, Fig. 2 is the double joint piston reset spring minimum pressure valve (wherein is cylindrical spring, and another root is a spring sheet) of big flow.They comprise: valve body 1, air inlet cavity a, the cavity b that gives vent to anger, pilot valve 2, piston 5, piston cylinder 7 etc., be provided with the spring that is used for piston reset between piston and the piston cylinder, their working principle is: pressurized gas enters from air inlet cavity a, act on the pilot valve 2, when the gas pressure at air inlet cavity a place reaches certain value, pilot valve 2 moves up with piston 5, and gas is discharged from the cavity b that gives vent to anger; When compressor quits work, the pressure at air inlet cavity a place descends suddenly, and the pressurized gas of pilot valve 2 tops keeps original pressure, add the effect of pilot valve Returnning spring 4, pilot valve 2 moves downward, rapidly air inlet cavity a is blocked, so the gas of the cavity b that gives vent to anger can't flow backwards, pilot valve 2 plays one-way valve.Subsequently, big piston 5 compresses pilot valve 2 under the effect of piston reset spring 6 and move down, and waits for the beginning of task down.Not only working principle is identical for pilot valve among Fig. 1 and Fig. 2, and its main something in common is: the power that pressurized gas acts on the pilot valve has spring to bear fully.When latus rectum increases, adopt two big springs.
Minimum pressure valve from small flow to big flow can find out obviously that obvious variation has taken place spring, and therefore the performance of valve also has corresponding variation.The structure of rill metered valve is little, and open and shut characteristic is good, and is highly sensitive; The valve of big flow must use the very big hard spring of rigidity, thereby make the structure heaviness of valve, open and shut characteristic is poor, sensitivity reduces, and easily produce the vibration of spring and cause the pulsation of air pressure, the direction that has retrained the past big flow of minimum pressure valve to a great extent develops, and this is the shortcoming that existing minimum pressure valve exists.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, provide a kind of and can reduce spring stress, improve spring and valve performance and life-span, reduce the volume of spring and valve, the novel back-pressure balance formula minimum pressure valve of raising valve flow.
Designed a kind of back-pressure balance formula minimum pressure valve according to above-mentioned purpose, comprise valve body 1, air inlet cavity a, the cavity b that gives vent to anger, pilot valve 2, piston 5, piston reset spring 6, valve body 1 is provided with closed back pressure cavity e, this back pressure cavity e and air inlet cavity a lay respectively at the both sides of piston 5, back pressure cavity e communicates with air inlet cavity a through passage, this passage is a built-in channel, is provided with the valving that is used for single effect in this passage, performance that can more effective raising valve; Described built-in channel can be made of the upper channel d that passes piston, the middle passage f between piston and pilot valve, the lower channel c that passes pilot valve; Be provided with pilot valve Returnning spring 4 in the middle passage f; The valving that is used for single effect is a ball 3, and this ball 3 also can replace with other shapes, has needed only single effect; This ball 3 preferably is arranged in the confluce of passage f and lower channel c.
Described pilot valve Returnning spring 4 between described back pressure cavity e and the air inlet cavity a can act on the ball 3 or act directly on the pilot valve 2.
The stressed complete elastic force by spring of the piston of the minimum pressure valve of prior art comes balance, when the suction port diameter of valve is done greatly, at this moment the very big hard spring of necessary employing rigidity comes the stress balance with piston, even adopt dual spring to come balance (as shown in Figure 2) with it, thereby make the structure heaviness of valve, and elasticity is hard more, assembling and debugging are difficult more, the open and shut characteristic of valve is bad, the low and easy pulsation that produces the vibration of spring and cause air pressure of sensitivity.The power major part that the present invention acts on the piston is come balance by back pressure, the stressed suction port latus rectum of valve that is not subjected to of spring retrains, so the latus rectum of valve and flow can strengthen arbitrarily, and spring is stressed very little, therefore the size of spring is little, and the volume of whole valve also just reduces.Because the size of spring is little, the generation vibration is little, and is therefore little to the generation pulsating nature of gas, and the life-span of spring is also high.Because the rigidity of spring is little, assembling and debugging are easy, and the open and shut characteristic of valve is good, and is highly sensitive, and the life-span is long.
The stressed complete elastic force by spring of piston comes balance in the prior art, make that the piston reset spring size is big, add that piston reset spring is installed in the apical position of piston, this increases the height of whole valve to some extent, in preferred implementation of the present invention, come balance by back pressure in that piston portion is stressed, reduce the stressed of spring, make on the little basis of piston reset spring size, use suitable square law device piston reset spring again, make the height of whole valve reduce, more embodied the present invention and had the little advantage of volume.
In sum, compared with prior art, the present invention has the advantage that the life-span is long, volume is little, flow is big, performance is good.
Description of drawings
Fig. 1 is the single piston reset spring minimum pressure valve structural representation of prior art;
Fig. 2 is the double joint piston reset spring minimum pressure valve structural representation of prior art;
Fig. 3,4,5,6 is respectively the structural representation of four kinds of real-time modes of back-pressure balance formula minimum pressure valve of the present invention;
Fig. 7 is the stressed schematic representation of the minimum pressure valve of prior art;
Fig. 8 is the stressed schematic representation of minimum pressure valve of preferred implementation shown in Figure 3;
The piece number of accompanying drawing is represented:
1, valve body 2, pilot valve 3, ball 4, pilot valve Returnning spring
5, piston 6, piston reset spring 7, piston cylinder 8, spring sheet
A, air inlet cavity b, the cavity c that gives vent to anger, lower channel d, upper channel
E, back pressure cavity f, middle passage g, external chennel
Embodiment
In order to deepen the understanding of the present invention, the invention will be further described below in conjunction with embodiment and accompanying drawing, and this example only is used to explain the present invention, does not constitute the qualification to protection domain of the present invention.
Fig. 3 shows a kind of mode of execution of minimum pressure valve of the present invention, comprise valve body 1, air inlet cavity a, the cavity b that gives vent to anger, pilot valve 2, ball 3, pilot valve Returnning spring 4, piston 5, piston reset spring 6, piston cylinder 7 etc., be provided with a back pressure cavity e between piston and the piston cylinder, passage between back pressure cavity e and the air inlet cavity a is a built-in channel, and this passage is made of the upper channel d that passes piston, the middle passage f between piston and pilot valve, the lower channel c that passes pilot valve; Be provided with pilot valve Returnning spring 4 in the middle passage f; Ball 3 is arranged in the confluce of passage f and lower channel c; This ball 3 can be made with rubber, also can select for use other shapes or material to replace, as long as play single effect; Described pilot valve Returnning spring 4 can act on the ball 3, also can act directly on the pilot valve 2.Described piston reset spring 6 is sleeved on the piston rod of piston 5, and is positioned at back pressure cavity e.
When compressor starts work, when catch pot is inflated, gas enters in the valve from air inlet cavity a, gas enters in the valve from air inlet cavity a, gas is pushed the ball 3 (power of pushing ball open is very little, can ignore) of middle passage f ingress open, and enters back pressure cavity e by middle passage f and upper channel d, act on the back side of piston 5 in formation back pressure in the back pressure cavity e, the gas of making a concerted effort to come balance air inlet cavity a of the elastic force of counterpressure and spring 6 acts on the power on the pilot valve 2.When the gas pressure at air inlet cavity a place continues to increase, when the pressure that gas acts on pilot valve 2 equaled making a concerted effort of back pressure and piston reset spring 6, pilot valve 2 was in the threshold state of opening.When the gas gas pressure at air inlet cavity a place continues to increase, when gas acts on pressure on the pilot valve 2 just greater than the making a concerted effort of back pressure and piston reset spring 6, pilot valve 2 trace open circuits, gas begins to discharge from the cavity b that gives vent to anger.When air inlet cavity a place pressure reached setting pressure, valve was just opened fully, and gas is discharged from the cavity b that gives vent to anger with peak rate of flow.When compressor quits work, no longer when the catch pot air feed, the pressure at air inlet cavity a place descends suddenly, and the pressure of pilot valve 2 tops keeps original pressure, add the effect of pilot valve Returnning spring 4, pilot valve 2 moves downward, and ball 3 also blocks up lower channel c simultaneously, pilot valve 2 is shut, and reaches to prevent gas refluence phenomenon.Subsequently, piston 5 moves down in the effect of piston reset spring 6, and pilot valve 2 is compressed, and waits for the beginning of task down.
Mode of execution shown in Figure 4 is that with the difference of mode of execution shown in Figure 3 back pressure cavity e is arranged between piston rod top and the piston cylinder, and piston reset spring 6 is installed in the piston rod, and is positioned at back pressure cavity inside.
The mode of execution of Fig. 3 and Fig. 4 can also be done conversion slightly in addition, promptly the piston reset spring among Fig. 36 is retrofitted in the piston rod, just the position on piston rod top; Piston reset spring 6 among Fig. 4 can be sleeved on the piston rod.
Fig. 5 and Fig. 6 change the passage between back pressure cavity e and the air inlet cavity a into an external passage, and the valving of single effect can be set in the passage, if but be provided with the performance that the valving that is used for single effect can more effective raising valve.The pilot valve Returnning spring 4 of Fig. 5 and two kinds of schemes of Fig. 6 acts directly on the pilot valve 2, need not ball 3.The scheme of other structures and working principle and Fig. 3 and Fig. 4 is basic identical.
Utilize mechanical model to introduce the working principle of minimum pressure valve below again, wherein the power of pilot valve Returnning spring 4 is very little, can omit and disregard.Advantage of the present invention can embody from the force analysis of piston 5, and Fig. 7 is the stressed schematic representation of the minimum pressure valve of prior art: the lower end is subjected to the pressure P of gas, and top is subjected to the power of the doing F1 of piston reset spring 6; Fig. 8 is the stressed schematic representation of Fig. 3 scheme back-pressure balance formula minimum pressure valve of the present invention: the lower end is subjected to the pressure P of gas, and the upper end is subjected to the pressure P of gas and the power of the doing F2 of piston reset spring 6.The piston reset spring 6 stressed sizes that draw separately according to mechanical equilibrium are as follows:
The stressed F1 of the piston reset spring 6 of the minimum pressure valve of prior art:
F1=PS1 S1-gas acts on the area on the small piston.
The stressed F2 of Fig. 3 scheme back-pressure balance formula minimum pressure valve piston reset spring 6 of the present invention:
F2=P (S1-S2)=PS0 S2-gas acts on the area on the big piston;
The section area of S0-big piston bar.
When the suction port latus rectum of two kinds of valves equates with initiation pressure, because S0＜＜S1, thus F2＜＜F1, promptly the required spring force of back-pressure balance formula minimum pressure valve is much smaller than the spring force of prior art.
The stressed complete elastic force by spring of the piston of the minimum pressure valve of prior art comes balance, when the suction port diameter of valve is done greatly, at this moment the very big hard spring of necessary employing rigidity comes the stress balance with piston, even adopt dual spring to come balance (as shown in Figure 2) with it, thereby make the structure heaviness of valve, and elasticity is hard more, assembling and debugging are difficult more, the open and shut characteristic of valve is bad, the low and easy pulsation that produces the vibrations of spring and cause air pressure of sensitivity.The power major part that the present invention acts on the piston is come balance by back pressure, the stressed suction port latus rectum of valve that is not subjected to of spring retrains, so the latus rectum of valve and flow can strengthen arbitrarily, and spring is stressed very little, therefore the size of spring is little, and the volume of whole valve also just reduces.Because the size of spring is little, the generation vibrations are little, and are therefore little to the generation pulsating nature of gas, and the life-span of spring is also high.Because the rigidity of spring is little, assembling and debugging are easy, and the open and shut characteristic of valve is good, and is highly sensitive, and the life-span is long.
Claims (2)
1. back-pressure balance formula minimum pressure valve, comprise valve body (1), air inlet cavity (a), the cavity (b) of giving vent to anger, pilot valve (2), piston (5), piston reset spring (6), valve body (1) is provided with closed back pressure cavity (e), this back pressure cavity (e) and air inlet cavity (a) lay respectively at the both sides of piston (5), back pressure cavity (e) communicates with air inlet cavity (a) through passage, this passage is a built-in channel, be provided with the valving that is used for single effect in the passage, it is characterized in that: described passage is by the upper channel that passes piston (d), middle passage (f) between piston and pilot valve, the lower channel (c) that passes pilot valve constitutes, and is provided with pilot valve Returnning spring (4) in the middle passage (f); The valving that is used for single effect is a ball (3), and this ball (3) is arranged in the confluce of passage (f) and lower channel (c).
2. minimum pressure valve according to claim 1 is characterized in that: pilot valve Returnning spring (4) acts on ball (3) and goes up or act directly on the pilot valve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031402259A CN100380033C (en) | 2003-08-19 | 2003-08-19 | Back-pressure balancing minimum pressure valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031402259A CN100380033C (en) | 2003-08-19 | 2003-08-19 | Back-pressure balancing minimum pressure valves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1490545A CN1490545A (en) | 2004-04-21 |
| CN100380033C true CN100380033C (en) | 2008-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031402259A Expired - Fee Related CN100380033C (en) | 2003-08-19 | 2003-08-19 | Back-pressure balancing minimum pressure valves |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494681C (en) * | 2005-05-13 | 2009-06-03 | 广东正力精密机械有限公司 | Gas compressor load discharging valve |
| WO2008029073A1 (en) * | 2006-09-08 | 2008-03-13 | Artemis Intelligent Power Limited | Fluid-working machine |
| BE1018073A3 (en) * | 2008-03-27 | 2010-04-06 | Atlas Copco Airpower Nv | MINIMUM PRESSURE VALVE. |
| CN101520103B (en) * | 2009-02-10 | 2011-01-19 | 南通市红星空压机配件制造有限公司 | Balance type minimum pressure valve |
| CN102434692B (en) * | 2011-09-23 | 2013-10-23 | 广东正力精密机械有限公司 | Partial back pressure balance membrane sheet type minimum pressure valve |
| CN104110411B (en) * | 2013-04-19 | 2016-08-24 | 刘立群 | Inverse-stopping type pressure valve |
| CN103343826B (en) * | 2013-07-05 | 2016-02-03 | 天津百利展发集团有限公司 | Non-return valve |
| CN104713424A (en) * | 2013-12-13 | 2015-06-17 | 航宇救生装备有限公司 | Burning explosion mechanism capable of preventing reverse fire moving |
| CN106468263B (en) * | 2015-08-18 | 2018-12-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Piston valve, varying capacity screw compressor and air conditioner |
| CN107504004A (en) * | 2017-09-13 | 2017-12-22 | 江苏恒立液压科技有限公司 | Novel pressure recuperation valve |
| CN109139425A (en) * | 2018-11-05 | 2019-01-04 | 南通市红星空压机配件制造有限公司 | Oil-injection-preventing air inlet valve for electric bus air compressor |
| CN111895134A (en) * | 2019-12-20 | 2020-11-06 | 中国航发长春控制科技有限公司 | Valve assembly integrating parking, shutoff and minimum pressure valve functions |
| CN116816961B (en) * | 2023-08-23 | 2023-11-21 | 成都中科唯实仪器有限责任公司 | Normally closed vacuum valve |
Citations (6)
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|---|---|---|---|---|
| GB1228827A (en) * | 1968-08-13 | 1971-04-21 | ||
| US4274434A (en) * | 1977-12-22 | 1981-06-23 | Haefele Carl Heinz | Automatic low-friction check valve |
| CN88101490A (en) * | 1987-03-23 | 1988-10-26 | 德雷塞工业公司 | The stepped piston that is used for the safety relief valve of balanced type guide control |
| CN2122992U (en) * | 1992-05-22 | 1992-11-25 | 中原石油技工学校 | Flow regulating valve |
| US5186198A (en) * | 1991-12-12 | 1993-02-16 | Penn Troy Maching Company, Inc. | Intake manifold relief valve |
| CN2641411Y (en) * | 2003-08-19 | 2004-09-15 | 查谦 | Back pressure balancing type small pressure valve |
-
2003
- 2003-08-19 CN CNB031402259A patent/CN100380033C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1228827A (en) * | 1968-08-13 | 1971-04-21 | ||
| US4274434A (en) * | 1977-12-22 | 1981-06-23 | Haefele Carl Heinz | Automatic low-friction check valve |
| CN88101490A (en) * | 1987-03-23 | 1988-10-26 | 德雷塞工业公司 | The stepped piston that is used for the safety relief valve of balanced type guide control |
| US5186198A (en) * | 1991-12-12 | 1993-02-16 | Penn Troy Maching Company, Inc. | Intake manifold relief valve |
| CN2122992U (en) * | 1992-05-22 | 1992-11-25 | 中原石油技工学校 | Flow regulating valve |
| CN2641411Y (en) * | 2003-08-19 | 2004-09-15 | 查谦 | Back pressure balancing type small pressure valve |
Non-Patent Citations (1)
| Title |
|---|
| 最小压力阀结构分析. 陆龙胜.期刊：压缩机技术，第4期、总第144期. 1997 * |
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| CN1490545A (en) | 2004-04-21 |
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Owner name: GUANGDONG ZHENGLI PRECISION MACHINERY CO., LTD. Free format text: FORMER OWNER: ZHA QIAN; ZHA SHI ; CHEN WEICHENG Effective date: 20080314 |
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Effective date of registration: 20080314 Address after: No. 10 Alex Hua Tian Road, Shunde hi tech Zone (Ronggui), Guangdong, Foshan: 528306 Patentee after: Guangdong Ganey Precision Machinery Co., Ltd. Address before: No. 11, tea tree road, Ronggui, Foshan, Shunde, Guangdong Province, China: 528305 Co-patentee before: Cha Shiliang Patentee before: Zha Qian Co-patentee before: Chen Weicheng |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080409 Termination date: 20140819 |
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