CN204476904U - A kind of noise reduction relief valve with equilibrium liquid power and adjustable damping function - Google Patents
A kind of noise reduction relief valve with equilibrium liquid power and adjustable damping function Download PDFInfo
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- CN204476904U CN204476904U CN201520035982.8U CN201520035982U CN204476904U CN 204476904 U CN204476904 U CN 204476904U CN 201520035982 U CN201520035982 U CN 201520035982U CN 204476904 U CN204476904 U CN 204476904U
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- 238000013016 damping Methods 0.000 title claims abstract description 75
- 230000009467 reduction Effects 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 title abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 230000007246 mechanism Effects 0.000 claims description 17
- 239000011148 porous material Substances 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008844 regulatory mechanism Effects 0.000 abstract 2
- 230000008859 change Effects 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
A kind of noise reduction relief valve with equilibrium liquid power and adjustable damping function, a flow-stopping plate is fixedly connected with near one end of oil back chamber at overflow spool, the end face of flow-stopping plate towards oil suction chamber side offers around the overflow spool baffle annular groove of a week, make the intersection point of the elongation line of overflow spool cone element and baffle annular groove end face be positioned at the medium position in whole annular groove face.The utility model sets up baffle annular groove, after being mapped to baffle annular groove with high speed by the fluid of valve port, baffle annular groove produces the impact force to spool, its direction is make valve port open large direction, contrary with its hydraulic power direction, inhibit hydraulic power on the impact of relief valve oil suction chamber pressure, improve regulation precision.The utility model also sets up damping hole, damping piston and damper regulation mechanism, damping piston and damping hole adopt small―gap suture to coordinate, and form damping cavity volume, can apply different dampings by damper regulation mechanism to overflow spool, alleviate the vibration of overflow spool, reach the effect of vibration and noise reducing.
Description
Technical Field
The utility model relates to an overflow valve that makes an uproar falls in damping, specific overflow valve that makes an uproar falls of balanced hydrodynamic force and adjustable damping that says so.
Background
When pressure oil in the oil inlet cavity pushes the valve core of the overflow valve and opens the overflow channel, liquid flows from the oil inlet cavity to the oil return cavity through the valve port, and acting force, namely hydraulic force, on the valve core can be formed. According to the fluid mechanics principle, the direction of the liquid force applied to the valve core is the direction which enables the valve port to be closed, and from the viewpoint of static performance, the following force balance equation is satisfied:
（1）
wherein,-a spring pre-compression force;-the area of the spool on which the oil acts;
-an oil inlet chamber pressure;-hydraulic power
Therefore, the pressure of the oil inlet chamber can be obtained from the formula (1)
（2）
As can be seen from the formula (2), the liquid pressure of the oil inlet cavity not only has the pre-tightening force of the springArea of action of liquid flowRelated to hydraulic powerIn connection with, and according to the principles of hydrodynamics, hydrodynamicsAnd is in direct proportion to the flow and speed of oil passing through the valve port, so that the spring pre-tightening force of the overflow valve is obtainedWhen the adjustment is carried out, if the liquid flow of the oil inlet cavity is changed due to the change of the load,then hydrodynamic forceThe original valve core is broken by the change of the pressure of the oil inlet cavityThe change causes unstable pressure of the oil inlet cavity of the overflow valve, the pressure stabilizing precision is poor, and then the pressure fluctuation of a system where the overflow valve is located can be caused, and the vibration and the noise are caused.
From the dynamic performance of the overflow valve, when the oil pressure of the oil inlet cavity pushes the valve core to have an axial openingThe valve core satisfies the following dynamic force balance equation:
（3）
wherein:-a spring pre-compression force;-spool area of action;-an oil inlet chamber pressure;M-a valve element and a spring mass;B-spool movement viscous damping coefficient;-spool displacement;
K-combined stiffness of the spring and hydraulic force;
order to
When in useWhen the formula (3) is solved by
（4）
WhereinIs a constant value, and is related to the initial value and the boundary condition.
As can be seen from equation (4), the displacement of the spool takes the form of a constant frequency vibration whose amplitude decays with time, and the damping coefficientBThe smaller, the damping ratioThe smaller the amplitude decays more slowly over time, the larger the vibration.
Because the viscous damping of the conventional overflow valve core is small, the valve core vibrates greatly after being opened or being interfered by the outside (such as the change of overflow flow), and the operation and the environment of equipment are adversely affected.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an overflow valve with balanced hydrodynamic force and adjustable damping function, this overflow valve can balance the change of the hydrodynamic force that leads to because overflow flow changes, the background art that reduces as far as possible promptly in formula (2)And also by adjusting the damping of the valve spool, i.e. in the formula (4)Is/are as followsThe value of the pressure regulating valve controls the vibration of the valve core, and the purposes of stabilizing the system pressure, improving the pressure regulating precision and reducing vibration and noise under different working conditions are achieved.
The utility model adopts the technical proposal that: the utility model provides an overflow valve of making an uproar falls with balanced hydrodynamics and adjustable damping function, which comprises a valve body, the overflow case of setting in the valve body inner chamber and the pressure adjustment mechanism who is used for adjusting overflow pressure in valve body one end, be equipped with oil feed chamber and oil return chamber on the valve body, under the state that the pressure in oil feed chamber is greater than the overflow pressure of settlement, the overflow valve core is moved to one side and is realized the overflow of fluid to oil return chamber by the oil feed chamber, one end fixed connection that is close to oil return chamber at the overflow valve core keeps off the flow board, keep off and offer the fender ring groove around overflow valve core a week on keeping off the flow board on the terminal surface of oil feed chamber one side, make the crossing point of the extension line of overflow valve core conical surface generating line and fender.
And further optimizing, wherein the intersection point of the extension line of the overflow valve core conical surface bus and the end face of the flow blocking ring groove is positioned at the center of the whole ring groove surface.
Further optimized, the groove depth of the flow blocking ring groove is 0.7 time of the radial length of the end face of the groove.
Further optimizing, the valve body on the one end that lies in the oil feed chamber still be equipped with the damping hole, be equipped with the damping piston who links into an integrated entity structure with the overflow valve core in the damping hole, the one end of damping hole is linked together through the return oil chamber on pore and the valve body.
Further optimized, the damping piston and the damping hole are in small clearance fit.
Further optimizing, still be equipped with damping adjustment mechanism, damping adjustment mechanism including setting up the throttle valve core and the actuating mechanism that is used for driving throttle valve core removal in pore and damping hole junction, through rotatory throttle valve core adjustable pore and damping hole junction opening size.
Further preferably, the pressure adjusting mechanism comprises an adjusting rod arranged on the valve body, a support contacted with one end of the adjusting rod and an elastic element arranged between the support and the overflow valve core, and the pre-pressure of the elastic element is adjusted by driving the adjusting rod to drive the support to move.
Preferably, the elastic element is a spring.
The utility model has the advantages that:
one of which, the utility model discloses add the fender stream annular, after penetrating the fender stream annular with the fluid of high-speed through the valve port, produce the impact force to the case on keeping off the stream annular, its direction is for making the big direction of valve port opening, and opposite with its hydrodynamic force direction, the hydrodynamic force that produces when having balanced the liquid flow through the overflow valve port has restrained the influence of hydrodynamic force to overflow valve oil feed chamber pressure, has reduced system's pressure fluctuation, has improved the pressure regulating precision.
And secondly, a damping piston and an adjusting mechanism are arranged at the end part of the valve core, when the valve core vibrates or impacts due to factors of inertia, elasticity or hydrodynamic force, oil between a damping containing cavity formed by the damping piston and a damping hole and an oil return cavity flows through a valve port of a throttle valve, the opening degree of the valve port is adjusted, the motion damping of the valve core is adjusted, and when external working conditions change, different damping can be applied to the valve core timely to achieve the purposes of vibration reduction and noise reduction.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view of a portion of the baffle ring groove of fig. 1.
The labels in the figure are: 1. the throttle valve comprises a valve body, 2, an overflow valve core, 3, an oil inlet cavity, 4, an oil return cavity, 5, a flow baffle plate, 6, a flow baffle ring groove, 7, a damping hole, 8, a damping piston, 9, a hole channel, 10, a throttle valve core, 11, an adjusting rod, 12, a support, 13 and an elastic element.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the embodiments of the present invention are based on the technical solution of the present invention and provide detailed embodiments and specific operation processes, but the scope of the present invention is not limited to the following embodiments.
As shown in the figure, the noise reduction overflow valve with the functions of balancing hydrodynamic force and adjusting damping comprises a valve body 1, an overflow valve core 2 arranged in an inner cavity of the valve body 1 and a pressure adjusting mechanism arranged at one end of the valve body 1 and used for adjusting overflow pressure, wherein an oil inlet cavity 3 and an oil return cavity 4 are arranged on the valve body 1, the overflow valve core 2 moves towards one side to realize overflow of oil from the oil inlet cavity to the oil return cavity in the state that the pressure of the oil inlet cavity 3 is greater than the set overflow pressure, and the pressure adjusting mechanism is the existing mature technology and adopts the following structure for example: the pressure adjusting mechanism comprises an adjusting rod 11 arranged on the valve body, a support 12 contacted with one end of the adjusting rod and an elastic element 13 arranged between the support and the overflow valve core, the support is driven to move by driving the adjusting rod, so that the pre-pressure of the elastic element is adjusted, and the elastic element 13 can adopt a spring;
according to the technical scheme, one end, close to the oil return cavity 4, of the overflow valve core 2 is fixedly connected with a flow baffle plate 5, a flow baffle ring groove 6 which surrounds the overflow valve core for a circle is formed in the end face, facing the oil inlet cavity 3, of the flow baffle plate 5, and the intersection point of the extension line of the conical surface bus of the overflow valve core 2 and the end face of the flow baffle ring groove 6 is located in the middle of the whole ring groove surface.
The most preferable structure of the scheme is as follows: the concrete setting of baffling the annular satisfies: a. the intersection point of the extension line of the valve core conical surface generatrix and the end face of the flow blocking ring groove is positioned at the center of the whole ring groove surface, namely AB =0.5 xBC, as shown in FIG. 2; b. the groove depth is 0.7 times the radial length of the groove end face, i.e. BD =0.7 × BC, as shown in fig. 2. Thus, the jet flow passing through the conical valve port can be ensured not to exceed the range of the flow blocking ring groove basically. According to the fluid mechanics principle, when the oil pressure of the oil inlet cavity 3 reaches the set pressure of the pressure regulating spring, the overflow valve port is opened, when oil flows out through the conical surface, hydraulic power is generated on the valve core, the direction of the hydraulic power is the direction for urging the valve core to close towards the valve port, the hydraulic power is related to factors such as overflow flow, when the overflow flow changes due to the change of external working conditions, the hydraulic power also changes, the original stress balance state is destroyed, and the valve core vibration, the pressure and the flow pulsation are caused. The utility model discloses add and keep off the circulation ring groove, after the fluid that passes through the valve port with high speed jets into and keeps off the circulation ring groove, produce on keeping off the circulation ring groove and produce the impact force to the case, its direction is for making the big direction of valve port opening, rather than the hydrodynamic force opposite direction, can play balanced hydrodynamic force, reduce the influence of hydrodynamic force, the effect of suppression system pressure fluctuation.
According to the technical scheme, a damping hole 7 is further formed in one end, located in an oil inlet cavity 3, of a valve body 1, a damping piston 8 which is connected with an overflow valve core 2 into an integral structure is arranged in the damping hole 7, one end of the damping hole 7 is communicated with an oil return cavity 4 in the valve body through a hole channel 9, the damping piston and the damping hole can be in small clearance fit, a damping adjusting mechanism is further arranged, the damping adjusting mechanism comprises a throttle valve core 10 and a driving mechanism, the throttle valve core 10 is arranged at the joint of the hole channel 9 and the damping hole 7, the driving mechanism is used for driving the throttle valve core to move, and the size of an opening at the joint of the hole channel 9 and the damping hole 7 can be adjusted through; the damping piston 8 and the overflow valve core 2 are connected into an integral structure to play a role in guiding the movement of the overflow valve core, meanwhile, the damping piston 8 partitions the damping hole 7 and enables the rear end of the damping hole to form a damping containing cavity, the damping containing cavity is communicated with the oil return cavity 4 of the valve body through a pore channel 9, a throttle valve core 10 is arranged at the joint of the pore channel 9 and the damping containing cavity, and the size of an opening, namely the size of liquid flow movement damping, is adjusted through the throttle valve core. When the valve core vibrates or impacts due to inertia, elasticity or hydrodynamic force, oil between the damping containing cavity and the oil return cavity 4 flows through the pore channel, the throttling valve core is driven to move to adjust the size of the opening, the motion damping of the overflow valve core is adjusted, and when external working conditions change, different damping can be applied to the overflow valve core timely, so that the purposes of vibration reduction and noise reduction are achieved.
Claims (8)
1. The utility model provides an overflow valve of making an uproar falls with balanced hydrodynamic force and adjustable damping function, includes the valve body, sets up the overflow case in the valve body inner chamber and sets up the pressure adjustment mechanism who is used for adjusting overflow pressure in valve body one end, is equipped with oil feed chamber and oil return chamber on the valve body, and under the pressure in oil feed chamber was greater than the state of the overflow pressure of settlement, the overflow case moved to one side and realized fluid by the oil feed chamber to the overflow in oil return chamber, its characterized in that: one end of the overflow valve core close to the oil return cavity is fixedly connected with a flow baffle plate, and a flow baffle ring groove which surrounds the overflow valve core for a circle is formed in the end face of the flow baffle plate, which faces one side of the oil inlet cavity, so that the intersection point of the extension line of the conical surface bus of the overflow valve core and the end face of the flow baffle ring groove is positioned in the middle of the whole ring groove surface.
2. The noise reduction overflow valve with the hydraulic power balancing and damping adjusting functions as claimed in claim 1, wherein: and the intersection point of the extension line of the overflow valve core conical surface bus and the end face of the flow blocking ring groove is positioned at the center of the whole ring groove surface.
3. The noise reduction overflow valve with the functions of balancing hydrodynamic force and adjusting damping as claimed in claim 1 or 2, wherein: the groove depth of the flow blocking ring groove is 0.7 times of the radial length of the end face of the groove.
4. The noise reduction overflow valve with the functions of balancing hydrodynamic force and adjusting damping as claimed in claim 1 or 2, wherein: the valve body is characterized in that a damping hole is further formed in one end, located in the oil inlet cavity, of the valve body, a damping piston connected with the overflow valve core into a whole is arranged in the damping hole, and one end of the damping hole is communicated with the oil return cavity in the valve body through a pore channel.
5. The noise reduction overflow valve with the functions of balancing hydrodynamic force and adjusting damping as claimed in claim 4, wherein: the damping piston and the damping hole are in small clearance fit.
6. The noise reduction overflow valve with the functions of balancing hydrodynamic force and adjusting damping as claimed in claim 4, wherein: the damping adjusting mechanism comprises a throttling valve core arranged at the joint of the pore passage and the damping hole and a driving mechanism used for driving the throttling valve core to move, and the size of an opening at the joint of the pore passage and the damping hole is adjusted by rotating the throttling valve core.
7. The noise reduction overflow valve with the functions of balancing hydrodynamic force and adjusting damping as claimed in claim 4, wherein: the pressure adjusting mechanism comprises an adjusting rod arranged on the valve body, a support contacted with one end of the adjusting rod and an elastic element arranged between the support and the overflow valve core, and the pre-pressure of the elastic element is adjusted by driving the adjusting rod to drive the support to move.
8. The noise reduction overflow valve with the functions of balancing hydrodynamic force and adjusting damping as claimed in claim 7, wherein: the elastic element is a spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520035982.8U CN204476904U (en) | 2015-01-20 | 2015-01-20 | A kind of noise reduction relief valve with equilibrium liquid power and adjustable damping function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520035982.8U CN204476904U (en) | 2015-01-20 | 2015-01-20 | A kind of noise reduction relief valve with equilibrium liquid power and adjustable damping function |
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| Publication Number | Publication Date |
|---|---|
| CN204476904U true CN204476904U (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520035982.8U Expired - Fee Related CN204476904U (en) | 2015-01-20 | 2015-01-20 | A kind of noise reduction relief valve with equilibrium liquid power and adjustable damping function |
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| CN (1) | CN204476904U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613036A (en) * | 2015-01-20 | 2015-05-13 | 洛阳理工学院 | Noise reduction overflow valve with hydrodynamic force balancing and adjustable damping functions |
| CN105715621A (en) * | 2016-04-28 | 2016-06-29 | 黄斌 | Direct relief valve with guide structure |
| CN109296794A (en) * | 2018-09-20 | 2019-02-01 | 青岛科技大学 | A kind of adjustable slide valve flow controller of precompressed |
-
2015
- 2015-01-20 CN CN201520035982.8U patent/CN204476904U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613036A (en) * | 2015-01-20 | 2015-05-13 | 洛阳理工学院 | Noise reduction overflow valve with hydrodynamic force balancing and adjustable damping functions |
| CN105715621A (en) * | 2016-04-28 | 2016-06-29 | 黄斌 | Direct relief valve with guide structure |
| CN109296794A (en) * | 2018-09-20 | 2019-02-01 | 青岛科技大学 | A kind of adjustable slide valve flow controller of precompressed |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150715 Termination date: 20160120 |
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| EXPY | Termination of patent right or utility model |