CN208381413U - A kind of pilot-operated type threeway proportional pressure-reducing valve - Google Patents
A kind of pilot-operated type threeway proportional pressure-reducing valve Download PDFInfo
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- CN208381413U CN208381413U CN201820916249.0U CN201820916249U CN208381413U CN 208381413 U CN208381413 U CN 208381413U CN 201820916249 U CN201820916249 U CN 201820916249U CN 208381413 U CN208381413 U CN 208381413U
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Abstract
The utility model discloses a kind of pilot-operated type threeway proportional pressure-reducing valves comprising main valve body, main valve body is interior to be equipped with oil return opening, and the pilot-operated type threeway proportional pressure-reducing valve further includes pilot valve, and the pilot valve includes: guide valve blocks；Proportion electro-magnet；Maximum pressure protection mechanism；Flow-stabilizing mechanism.The utility model has pilot stage, external control oil circuit, main spool spring rigidity is small, when changes in flow rate, output pressure fluctuation is smaller, therefore it can be used for the occasion of high-pressure high-flow, the utility model can establish different control pressure in pilot valve, make to form corresponding expenditure and pressure mouth between spool and valve body, and realization is continuous, proportional to control the parameters such as pressure, the flow of oil liquid.It is not only able to achieve automatic control, long-range control, but also has many advantages, such as that contamination resistance is strong, at low cost, response is very fast, improves system performance.
Description
Technical field
The utility model relates to a kind of pressure reducing valves, and in particular to a kind of pilot-operated type threeway proportional pressure-reducing valve.
Background technique
Pressure reducing valve be it is a kind of flow through gap using liquid stream and generate the pressure loss, make its oil outlet pressure lower than inlet pressure
Pressure-control valve.
When the pilot-type two-port type pressure reducing valve generallyd use at present is for operating conditions such as inertia load or elastic loads, decompression
May instantaneously there be reverse flow in valve load cavity, cause instantaneously to generate compression shock in pressure reducing valve load cavity, valve is difficult normal work
Make；When pilot-type two-port pressure reducing valve is for operating conditions such as stable state loads or positioning, load flow very little, what is at this moment inputted is electrical
Signal is difficult accurately to control output pressure.And pilot-operated type threeway proportional pressure-reducing valve can effectively change this status.First
Conduction threeway proportional pressure-reducing valve is to increase an oil return opening on the basis of pilot-type two-port type pressure reducing valve, becomes one three
Logical complex function valve, it is secondary hydraulic when A mouthfuls of secondary pressures are instantaneously excessively high for decompression when oil liquid flowing from P mouthful to A mouthfuls
Oil is discharged from T mouthfuls.
Universal threeway proportional pressure-reducing valve is Direct Action Type at present, with pressure spring pressure regulation, when hypertonia, then and spring
Rigidity is necessarily excessive, and when changes in flow rate, output pressure fluctuation is larger, causes the size of valve larger, therefore direct-acting triple depressurizes
Valve is only used for small flow occasion.
Utility model content
The utility model to solve the above-mentioned problems, to provide a kind of pilot-operated type threeway proportional pressure-reducing valve.
In order to achieve the above objectives, the technical solution of the utility model is as follows:
A kind of pilot-operated type threeway proportional pressure-reducing valve, the pilot-operated type threeway proportional pressure-reducing valve includes main valve body, the main valve
Body is equipped with main valve plug, and the main valve plug left end is stifled equipped with main valve plug, and the main valve plug is stifled to be provided with damping, and the main valve plug is logical
Centralizing spring centering is crossed, the main valve plug right end has end cap by pin connection, is equipped with oil return opening, the guide in the main valve body
Formula threeway proportional pressure-reducing valve further includes pilot valve, and the pilot valve includes:
Guide valve blocks, the guide valve blocks setting are connected on main valve body, and with main valve body, are equipped in the guide valve blocks
Cavity, the cavity is interior to be equipped with adjusting screw rod and cone；
Proportion electro-magnet, the proportion electro-magnet and cone are drivingly connected；
Maximum pressure protection mechanism, the maximum pressure protection mechanism are arranged on guide valve blocks；
Flow-stabilizing mechanism, the flow-stabilizing mechanism flow-stabilizing mechanism are arranged on guide valve blocks, and protect machine with maximum pressure respectively
Structure is connected to the cavity of adjusting screw rod.
In a preferred embodiment of the utility model, the adjusting screw rod is threadedly coupled with guide valve blocks, and is passed through
Locking nut locking.
In a preferred embodiment of the utility model, the maximum pressure protection mechanism includes:
Adjusting set, the adjusting set are threadedly coupled with guide valve blocks, are equipped in the adjusting set and are adjusted cavity；
Valve seat, the valve seat setting are connected in pilot valve body, and with flow-stabilizing mechanism；
Poppet valve core, the poppet valve core and valve seat are cooperatively connected；
Spring, the spring are arranged in adjusting cavity body, and one end withstands poppet valve core；
The other end of spring is arranged in spring base, the spring base；
Support sleeve, the support are set on above adjusting set；
Holding screw, the holding screw are threadedly coupled with adjusting set, and the other end and spring base are drivingly connected.
Elastic spring is equipped with above the valve seat described in a preferred embodiment of the utility model.
In a preferred embodiment of the utility model, the flow-stabilizing mechanism includes:
Current stabilization valve pocket, the flow stabilizing valve are set in guide valve blocks；
Current stabilization valve seat, the flow stabilizing valve seat supports current stabilization valve pocket and steady flow valve core；
Steady flow valve core, the steady flow valve core are arranged in current stabilization valve pocket,
Current stabilization spring, the current stabilization spring are arranged in steady flow valve core cavity；
Spring base, the spring base are connect with flow stabilizing valve external threading, and the spring base and the cooperation of the current stabilization spring other end connect
It connects.
The beneficial effects of the utility model are:
The utility model has pilot stage, external control oil circuit, and main spool spring rigidity is small, when changes in flow rate, output pressure wave
It is dynamic smaller, therefore can be used for the occasion of high-pressure high-flow.
The utility model can establish different control pressure in pilot valve, make to form corresponding section between spool and valve body
Pressure-reduction outlet is flowed, realization is continuous, proportional to control the parameters such as pressure, the flow of oil liquid.It is not only able to achieve automatically
Control, long-range control, and have many advantages, such as that contamination resistance is strong, at low cost, response is very fast, improve system performance.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram of maximum pressure protection mechanism；
Fig. 3 is the structural schematic diagram of flow-stabilizing mechanism；
Fig. 4 is the working principle diagram of the utility model.
Specific embodiment
In order to be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, under
Face combines and is specifically illustrating, and the utility model is further described.
Referring to Fig. 1 to Fig. 4, pilot-operated type threeway proportional pressure-reducing valve provided by the utility model comprising main valve body 100 and elder generation
Pilot valve 200.
Main valve plug 110 is equipped in main valve body 100, main valve body 100 and the effective clearance of main valve plug 110 ensure that main valve plug
The reliability of 110 movements.
Outer oil-feed port X mouthfuls are provided on main valve body 100, outer oil-feed port X mouthfuls there are threaded holes between oil inlet P mouth, can mention
For it is interior for and it is outer for guide oil.
110 left end of main valve plug has been connected through a screw thread main valve plug stifled 111, and main valve plug stifled 110 is provided with damping 112, in this way
It ensure that the restriction loss of 110 left and right ends of main valve plug.
Main valve plug 110 is threadedly coupled by pin 130 with end cap 140 by 120 centering of centralizing spring, 110 right end of main valve plug,
It can prevent main valve plug 110 from rotating during the work time in this way.
In addition, increasing an oil return inlet T mouth on main valve body 100, the P mouth of main valve body 100 may be implemented in this way to A mouthfuls
The function of decompression and A mouthfuls to T mouthfuls limitation system pressures, therefore, it can compensate outlet load dynamic pressure impact, so as to
Effectively to control load pressure when small flow, and can be effectively improved since the operating conditions such as inertia load or elastic load are to load cavity
Caused by instantaneous pressure impact.
Pilot valve 200 comprising guide valve blocks 210, proportion electro-magnet 220, maximum pressure protection mechanism 230 and current stabilization machine
Structure 240.
The setting of guide valve blocks 210 is connected on main valve body 100, and with main valve body 100, and chamber is equipped in guide valve blocks 210
Body is equipped with adjusting screw rod 211 and cone 212 in cavity, when adjusting screw rod 211 is separated with cone 212, between can be formed
2. one poppet port 300, poppet port 300 are connected to by pipeline with Y mouthfuls of outlet mouth, realize outlet.
Adjusting screw rod 211 is connected through a screw thread with guide valve blocks 210, and is locked by locking nut 213
Proportion electro-magnet 220 and cone 212 are drivingly connected, and cone 212 can be driven mobile, to realize adjusting spiral shell
Division between bar 211 and cone 212 passes through the pressure of the settable poppet port 300 of proportion electro-magnet 220 in this way.
Maximum pressure protection mechanism 230 is arranged on guide valve blocks 210, and links up with 240 oil outlet of flow-stabilizing mechanism,
It is to prevent pilot stage secondary pressure oil pressure instantaneously excessively high, to damage element.
Maximum pressure protection mechanism 230 specifically includes:
Adjusting set 231, adjusting set 231 are threadedly coupled with guide valve blocks 210, in this way can be by rotating adjusting set 231, coarse adjustment
Pressure value is equipped in adjusting set 231 and adjusts cavity；
Valve seat 232, valve seat 232 are arranged on guide valve blocks, and link up with the oil outlet of flow-stabilizing mechanism 240, on valve seat 232
Equipped with elastic spring 238, elastic spring 238 can prevent from destroying maximum pressure protection mechanism 230 when hypertonia；
Poppet valve core 239, poppet valve core 239 and valve seat 232 are cooperatively connected；
Spring 233, spring 233 are arranged in adjusting cavity body, and one end withstands on poppet valve core 239 in valve seat 232；
The other end of spring 233 is arranged in spring base 234, spring base 234；
Support sleeve 235, support sleeve 235 are arranged above adjusting set 231；
Holding screw 236, holding screw 236 are connect with thread of supporting sleeves, and the other end and spring base 234 are drivingly connected, can
Realize the accurate adjustment of pressure.
The course of work of maximum pressure protection mechanism 230 is as follows:
When secondary pressure oil pressure is excessively high, oil liquid enters valve seat 232 by the outlet of flow-stabilizing mechanism 240, and in valve
Pressure is established at 232 valve ports of seat, if oil liquid pressure is more than setting value, valve port is opened at poppet valve core 239 and 232 cooperation of valve seat, liquid
Pressure oil enters spring cavity, since spring cavity is connected to Y mouthfuls of outlet mouth, therefore oil liquid from by pipeline 2. from Y mouthfuls of zero-pressures of outlet mouth
Discharge；Realize the effect for limiting guide valve blocks highest secondary pressure and protecting.
Flow-stabilizing mechanism 240 is arranged on guide valve blocks 210, and the oil inlet P oral groove on one end and guide valve blocks 210 is logical,
The other end is respectively communicated with the cavity of maximum pressure protection structure 230 and adjusting screw rod 300, and external guide oil can be from main valve body
It is outer oil-feed port X mouthfuls enter after 1. pass through flow-stabilizing mechanism 240 through pipeline, flow-stabilizing mechanism 240 can provide the pilot stage of approximately constant
Flow, and pressure is established at poppet port 300.
Flow-stabilizing mechanism 240 specifically includes:
Current stabilization valve pocket 241, current stabilization valve pocket 241 are arranged in guide valve blocks 210；
Current stabilization valve seat 242, current stabilization valve seat 242 support current stabilization valve pocket 241 and steady flow valve core 244；
Current stabilization spring 243,243 one end of current stabilization spring and current stabilization valve seat 242 are cooperatively connected；
Steady flow valve core 244, steady flow valve core 244 are arranged in current stabilization valve pocket 241, and current stabilization spring 243 is arranged in steady flow valve core
In 244 cavitys；
Spring base 245, spring base 245 and 241 thread connection of current stabilization valve pocket, spring base 245 and 243 other end of current stabilization spring
It is cooperatively connected.
The course of work of flow-stabilizing mechanism 240 is as follows:
Guide's oil liquid from outer oil-feed port X mouthfuls by the road 1. reach pilot valve P mouthful place, 244 lower end of steady flow valve core foundation pressure
Power, meanwhile, oil liquid flows through the fixed throttle port on steady flow valve core 244, reaches spring cavity, and from variable on current stabilization valve pocket 241
Restriction outflow.
When 244 fixed throttle port both ends pressure difference of steady flow valve core is less than acting force of the spring, steady flow valve core 244 is in most lower
End, settable orifice standard-sized sheet, without adjustment effect, total is equivalent to the throttle valve that two fixed throttle ports are connected in series,
The function of not keeping flow constant.
When 244 fixed throttle port both ends pressure difference of steady flow valve core is greater than acting force of the spring, spool is pushed to rise, compresses current stabilization
Spring, settable orifice reduce, until pressure difference and spring dynamic balance, settable orifice part is closed, and plays consumption pressure, keep
The constant effect of total pressure head, passes through the flow substantially constant of current-stabilizing structure in this way, plays the work of current stabilization between current-stabilizing structure inlet and outlet
With.
Here is the course of work of the application:
It is set by inputting electrical control signal comparative example electromagnet 220, needed for being established at poppet port 300
Control force.When applying pressure not in P mouthfuls, main valve plug 110 is maintained at middle position by centralizing spring 120, in this case, first
Pilot valve mouth 300 is normally closed.
When from 1. guide oil being passed into flow-stabilizing mechanism 240 and poppet port 300 from outer oil-feed port X mouthfuls by the road, it can lead to
Crossing outer drain line, 2. zero-pressure is discharged.
And when 1. guide oil from when introducing for outer oil-feed port X mouthfuls by the road, since main valve plug left end bearing area is greater than right end,
At this moment main valve plug 110 can be pushed to right side, at this point, hydraulic oil flows to A mouthfuls from P mouthfuls, the pressure of executing agency is established in hydraulic fluid port A
At poppet port 300,
When value set in A mouthfuls of pressure rises to pilot valve, cone 212 can be separated with adjusting screw rod 211, guide
It can be opened at valve port 300,2. hydraulic oil flows out by the road from Y mouthfuls, liquid stream flows through 112 holes of damping, will cause restriction loss, leads
The decline of 110 left chamber pressure of main valve plug is caused, at this moment main valve plug 110 can be pushed away to the left, and the valve port flow area on main valve body 100 subtracts
Small, at this moment it is roughly the same to set pressure with pilot valve for the pressure in hydraulic fluid port A.
If being more than that pilot valve set pressure can be caused due to damping action when the A mouthfuls of load cavity pressures connected increase
Make main valve plug 110 break balance to continue to be moved to the left, so that A mouthfuls to T mouthfuls of connection is opened, oil liquid is discharged from A mouthfuls to T mouthfuls.This
When A mouthfuls of pressure reduce, main valve plug 110 can move to right, until establishing new balance, by stable the setting in proportion electro-magnet 220 of A mouthful pressure
In definite value.
Here is the specific application example of the application:
When no input signal is to proportion electro-magnet 220, the application is in normal position, main under the action of centralizing spring 120
Spool 110 is in middle position, and tri- hydraulic fluid ports of P, T, A end mutually at this time；
When proportion electro-magnet iron 220 must be electric, under the action of electromagnetic force, electromagnet push-rod stretches out, action cone body 212
One end generates control force；
1. guide oil can be passed into from flow-stabilizing mechanism 240 and poppet port 300 from oil inlet pipe, and must pass through draining
2. zero-pressure is discharged pipeline.
Guide oil is introduced from outer oil-feed port X mouthfuls, by the road 1. after, further through damping 112 and main valve plug stifled 111, due to master
110 left end bearing area of spool is greater than right end, therefore main valve plug 110 is pushed to right side, and hydraulic oil flows to A mouthfuls from P mouthfuls, in hydraulic fluid port A
The pressure of executing agency is established at poppet port 300；
When the pressure in hydraulic fluid port A increases to value set by proportion electro-magnet iron 220 on pilot valve, 300 meeting of poppet port
It is opened, guide oil is flowed out from Y mouthfuls, and liquid stream flows through damping 112, causes restriction loss, causes under 110 left chamber pressure of main valve plug
Drop, main valve plug 110 are pushed to left side, and the pressure being arranged in the pressure and pilot valve in hydraulic fluid port A is essentially identical；
It is more than pilot valve set pressure if the A mouthfuls of load cavity pressures connected continue to increase, due to 112 effect of damping, causes
Make main valve plug 110 break balance to be moved to the left, so that A mouthfuls to T mouthfuls of connection is opened, oil liquid is discharged from A mouthfuls to T mouthfuls.A mouthfuls at this time
Pressure reduces, and main valve plug 110 moves to right, and until establishing new balance, A mouthfuls of pressure are stablized the setting value in proportion electro-magnet iron 220
On.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above.Current row
The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (5)
1. a kind of pilot-operated type threeway proportional pressure-reducing valve, the pilot-operated type threeway proportional pressure-reducing valve includes main valve body, the main valve body
It is equipped with main valve plug, the main valve plug left end is stifled equipped with main valve plug, and the main valve plug is stifled to be provided with damping, and the main valve plug passes through
Centralizing spring centering, the main valve plug right end have end cap by pin connection, which is characterized in that oil return is equipped in the main valve body
Mouthful, the pilot-operated type threeway proportional pressure-reducing valve further includes pilot valve, and the pilot valve includes:
Guide valve blocks, the guide valve blocks setting are connected on main valve body, and with main valve body, and chamber is equipped in the guide valve blocks
Body, the cavity is interior to be equipped with adjusting screw rod and cone；
Proportion electro-magnet, the proportion electro-magnet and cone are drivingly connected；
Maximum pressure protection mechanism, the maximum pressure protection mechanism are arranged on guide valve blocks；
Flow-stabilizing mechanism, the flow-stabilizing mechanism flow-stabilizing mechanism are arranged on guide valve blocks, and respectively with maximum pressure protection mechanism and
The cavity of adjusting screw rod is connected to.
2. a kind of pilot-operated type threeway proportional pressure-reducing valve according to claim 1, which is characterized in that the adjusting screw rod and elder generation
Pilot valve body is threadedly coupled, and is locked by locking nut.
3. a kind of pilot-operated type threeway proportional pressure-reducing valve according to claim 1, which is characterized in that the maximum pressure protection
Mechanism includes:
Adjusting set, the adjusting set are threadedly coupled with guide valve blocks, are equipped in the adjusting set and are adjusted cavity；
Valve seat, the valve seat setting are connected in pilot valve body, and with flow-stabilizing mechanism；
Poppet valve core, the poppet valve core and valve seat are cooperatively connected；
Spring, the spring are arranged in adjusting cavity body, and one end withstands poppet valve core；
The other end of spring is arranged in spring base, the spring base；
Support sleeve, the support are set on above adjusting set；
Holding screw, the holding screw are threadedly coupled with adjusting set, and the other end and spring base are drivingly connected.
4. a kind of pilot-operated type threeway proportional pressure-reducing valve according to claim 3, which is characterized in that be equipped with above the valve seat
Elastic spring.
5. a kind of pilot-operated type threeway proportional pressure-reducing valve according to claim 1, which is characterized in that the flow-stabilizing mechanism packet
It includes:
Current stabilization valve pocket, the flow stabilizing valve are set in guide valve blocks；
Current stabilization valve seat, the flow stabilizing valve seat supports current stabilization valve pocket and steady flow valve core；
Steady flow valve core, the steady flow valve core are arranged in current stabilization valve pocket,
Current stabilization spring, the current stabilization spring are arranged in steady flow valve core cavity；
Spring base, the spring base are connect with flow stabilizing valve external threading, and the spring base and the current stabilization spring other end are cooperatively connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820916249.0U CN208381413U (en) | 2018-06-13 | 2018-06-13 | A kind of pilot-operated type threeway proportional pressure-reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820916249.0U CN208381413U (en) | 2018-06-13 | 2018-06-13 | A kind of pilot-operated type threeway proportional pressure-reducing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208381413U true CN208381413U (en) | 2019-01-15 |
Family
ID=64967633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820916249.0U Active CN208381413U (en) | 2018-06-13 | 2018-06-13 | A kind of pilot-operated type threeway proportional pressure-reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208381413U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108662222A (en) * | 2018-06-13 | 2018-10-16 | 上海立新液压有限公司 | A kind of pilot-operated type threeway proportional pressure-reducing valve |
| CN111255944A (en) * | 2020-04-30 | 2020-06-09 | 星宇电子(宁波)有限公司 | Pilot-operated proportional flow valve with position and flow composite feedback function |
-
2018
- 2018-06-13 CN CN201820916249.0U patent/CN208381413U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108662222A (en) * | 2018-06-13 | 2018-10-16 | 上海立新液压有限公司 | A kind of pilot-operated type threeway proportional pressure-reducing valve |
| CN111255944A (en) * | 2020-04-30 | 2020-06-09 | 星宇电子(宁波)有限公司 | Pilot-operated proportional flow valve with position and flow composite feedback function |
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