CN2649836Y - Multi-way valve with uniform-pressure-drop valve - Google Patents

Multi-way valve with uniform-pressure-drop valve Download PDF

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Publication number
CN2649836Y
CN2649836Y CN 200320109501 CN200320109501U CN2649836Y CN 2649836 Y CN2649836 Y CN 2649836Y CN 200320109501 CN200320109501 CN 200320109501 CN 200320109501 U CN200320109501 U CN 200320109501U CN 2649836 Y CN2649836 Y CN 2649836Y
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CN
China
Prior art keywords
way valve
valve
pressure
utility
model
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 200320109501
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Chinese (zh)
Inventor
傅新
冀宏
杨华勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University ZJU
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Zhejiang University ZJU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to CN 200320109501 priority Critical patent/CN2649836Y/en
Application granted granted Critical
Publication of CN2649836Y publication Critical patent/CN2649836Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Safety Valves (AREA)

Abstract

The utility model discloses a multi-way valve with a fixed-pressure reduction valve which is arranged between a back oil port and a back oil pipe line of the multi-way valve, which intensifies pressure force of a valve chamber in the multi-way valve and ensures that the multi-way valve is quiet under condition of various opening degree and flow rate, and various working condition. In addition, the pressure difference of the uniform pressure drop valve is relatively small, which prevents from additional noise and pressure loss. The utility model has the advantages of novel design, simple structure, and good craftiness, and greatly reduces noise of the multi-way valve and improves the integrate performance of the machine. The utility model can be applied to mobile machinery like construction machinery and hoisting and conveying machinery to perform central control of multiple working units in multiple control manners like manual, electro hydraulic, and electro-hydraulic proportion manners, etc.

Description

The multi-way valve of band Fixed differential reducing valve
Affiliated technical field
The utility model relates to a kind of multi-way valve, relates in particular to a kind of multi-way valve with Fixed differential reducing valve.
Background technique
Multi-way valve is widely used in the running mechanisms such as engineering machinery, handling machinery, carry out the centralized control of a plurality of operation mechanisms, multiple control modes such as manual, electric liquid, electric-hydraulic proportion etc. are arranged, and the valve port structure of multi-way valve is generally guiding valve, non-complete all opening guiding valves and cone valve.Multi-way valve noise problem can occur in real work, show as sometimes to utter long and high-pitched sounds, scream, and influences the credit worthiness and the performance evaluation of whole set equipment.Because multi-way valve generally is positioned near the operator, noise also can increase the weight of operator's fatigue, reduction operation comfort.
Cavitation Noise is the main noise of multi-way valve, under different valve port opening, pressure reduction and flow, because valve port throttling action, low pressure area occurs at the valve port rear portion, when this local depression reached or be lower than fluid air separation pressure, the bubble in the fluid can be separated out, when bubble flows to downstream flow with oil, because pressure gos up, bubble can break, and forms noise.This Cavitation Noise and valve pocket magnitude of back pressure are in close relations.In real system, because differences such as return line setting type, pipeline length and annexes thereof, oil return resistance (back pressure) differs bigger; Along with the flow difference, back pressure also can change.
Experimental research shows that back pressure has decisive influence to noise, and noise is very responsive to back pressure, has a back pressure critical value for hydrovalve, makes the noise maximum, and when back pressure was slightly larger than this critical backing pressure value, the disappearance of screaming, noise reduced rapidly.
Summary of the invention
The purpose of this utility model provides a kind of multi-way valve with Fixed differential reducing valve, by Fixed differential reducing valve being set at the multi-way valve return opening, improve the pressure of multi-way valve oil return valve pocket, make all to be slightly larger than critical backing pressure value under the various valve port opening back pressure value of noise maximum (make), thereby reduce the noise of multi-way valve in this back pressure value under the various operating modes.
The technical solution adopted in the utility model is: comprise multi-way valve, be provided with a Fixed differential reducing valve between the return opening of multi-way valve and return line.
Said Fixed differential reducing valve is to be integrated in the multi-way valve or to be connected in the multi-way valve return line.
The useful effect that the utlity model has is: the Fixed differential reducing valve on the multi-way valve return opening boosts to the oil return valve pocket in the multi-way valve, prevents the appearance of critical backing pressure value, thereby eliminates air pocket whistler and excessive noise.Fixed differential reducing valve makes pressure in the multi-way valve oil back chamber, and (0.5~1MPa), because pressure reduction is lower, the system pressure loss is less than the high steady state value of loine pressure of direct oil return all the time.The utility model is applicable to the noise control of various multi-way valve, the principle novelty, simple in structure, noise reduction is remarkable.Can be used for carrying out the centralized control of a plurality of operation mechanisms in the running mechanisms such as engineering machinery, handling machinery, multiple control modes such as manual, electric liquid, electric-hydraulic proportion etc. are arranged.
Description of drawings
Accompanying drawing is a systematic schematic diagram of the present utility model.
In the accompanying drawing: 1. Fixed differential reducing valve assembly, 2. multi-way valve return opening, 3. Fixed differential reducing valve, 4. Fixed differential reducing valve pressure adjusting spring, 5. fuel tank, 6. return line, 7. first selector valve, 8. second selector valve, 9. one-way valve, 10. safety valve, 11. multi-way valve.
Embodiment
Multi-way valve because pressure reduction is big, back pressure is low, Cavitation Noise occurs easily in the oil return process, this noise is the main noise source of multi-way valve.Discovered that back pressure is to the The noise rule.The utility model is avoided the noise control thought that the critical backing pressure value occurs based on the multi-way valve oil back chamber is boosted, make multi-way valve eliminate under different valve port opening, flow size and various operating modes and scream, present good low noise effect.
As shown in drawings, the utility model comprises multi-way valve 11; Between the return opening 2 of multi-way valve 11 and return line 6, be provided with a Fixed differential reducing valve 1.
Said Fixed differential reducing valve 1 is to be integrated in the multi-way valve or to be connected in the multi-way valve return line.Set pressure is 0.5~1MPA.
The multi-way valve working procedure of above-mentioned band Fixed differential reducing valve is as follows:
The oil return of each executive component is through the H point of the I of first selector valve 7 point, second selector valve 8, enter multi-way valve return opening 2, enter the import of the Fixed differential reducing valve 3 in the Fixed differential reducing valve assembly 1 again, under the setting pressure reduction of the pressure adjusting spring 4 of Fixed differential reducing valve 3, flow through Fixed differential reducing valve 3 and return line 6, get back to fuel tank 5.Because the effect of Fixed differential reducing valve 3, make the pressure of multi-way valve return opening 2 (also being the oil return valve pocket) be higher than definite value of Fixed differential reducing valve 3 outlet pressures all the time, this value is set by pressure adjusting spring 4, for fear of causing that excessive pressure loss Fixed differential reducing valve pressure is set at 0.5~1MPA.Such back pressure value can surpass the critical backing pressure value, makes Cavitation Noise greatly reduce.
When each selector valve in the multi-way valve 11 all is in meta, the oil that comes by oil hydraulic pump directly flows back to fuel tank 5 through hydraulic fluid port in each valve body and the Fixed differential reducing valve 3, at this moment oil liquid pressure is that the resistance of oil line pipe causes, hydraulic system is in unloading condition, noise problem can not appear, oil return is without Fixed differential reducing valve 3, so avoided the pressure loss during off-load.
Fluid enters multi-way valve 11, when not working, fluid directly through the meta of multi-way valve 11, return line 6 to fuel tank 5, executive component is connected on C, the D mouth of A, B mouth or first selector valve 7 of second selector valve 8 respectively into and out of hydraulic fluid port.One-way valve 9 in the multi-way valve 11 is owing to prevent the influence of load shock to pump, and safety valve 10 is used for preventing system overload.Include Fixed differential reducing valve 4 and some hydraulic fluid port that is connected with multi-way valve and duct in the Fixed differential reducing valve assembly 1.

Claims (2)

1. the multi-way valve with Fixed differential reducing valve comprises multi-way valve (11), it is characterized in that: be provided with a Fixed differential reducing valve (1) between the return opening (2) of multi-way valve (11) and return line (6).
2. the multi-way valve of band Fixed differential reducing valve according to claim 1 is characterized in that: said Fixed differential reducing valve (1) is to be integrated in the multi-way valve or to be connected in the multi-way valve return line.
CN 200320109501 2003-10-30 2003-10-30 Multi-way valve with uniform-pressure-drop valve Expired - Fee Related CN2649836Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200320109501 CN2649836Y (en) 2003-10-30 2003-10-30 Multi-way valve with uniform-pressure-drop valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200320109501 CN2649836Y (en) 2003-10-30 2003-10-30 Multi-way valve with uniform-pressure-drop valve

Publications (1)

Publication Number Publication Date
CN2649836Y true CN2649836Y (en) 2004-10-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200320109501 Expired - Fee Related CN2649836Y (en) 2003-10-30 2003-10-30 Multi-way valve with uniform-pressure-drop valve

Country Status (1)

Country Link
CN (1) CN2649836Y (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100414132C (en) * 2005-08-05 2008-08-27 丰田自动车株式会社 Friction apply device of an automatic transmission
CN103161780A (en) * 2013-03-20 2013-06-19 李瑞川 Multi-way reversing valves based on single-ended oil source control body

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100414132C (en) * 2005-08-05 2008-08-27 丰田自动车株式会社 Friction apply device of an automatic transmission
CN103161780A (en) * 2013-03-20 2013-06-19 李瑞川 Multi-way reversing valves based on single-ended oil source control body
CN103161780B (en) * 2013-03-20 2016-02-10 日照海卓液压有限公司 A kind of multiple directional control valve based on single-ended oil sources management system

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C19 Lapse of patent right due to non-payment of the annual fee
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