CN205605541U - Multistage pressure automatic switch -over detects structure - Google Patents
Multistage pressure automatic switch -over detects structure Download PDFInfo
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- CN205605541U CN205605541U CN201620410725.2U CN201620410725U CN205605541U CN 205605541 U CN205605541 U CN 205605541U CN 201620410725 U CN201620410725 U CN 201620410725U CN 205605541 U CN205605541 U CN 205605541U
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- pressure
- directional control
- control valve
- pilot operated
- operated directional
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Abstract
The utility model provides a multistage pressure automatic switch -over detects structure, includes parallelly connected low pressure pilot operated directional control valve and middling pressure pilot operated directional control valve, and the oil -out and the low -pressure pressure sensor of low pressure pilot operated directional control valve are connected, and the oil inlet and the pressure hydraulic fluid port of low pressure pilot operated directional control valve are connected, and the oil return opening and the drain tap of low pressure pilot operated directional control valve are connected, the oil -out and the middling pressure pressure sensor of middling pressure pilot operated directional control valve are connected, and the oil inlet of middling pressure pilot operated directional control valve is connected with pressing the hydraulic fluid port, and the oil return opening and the drain tap of middling pressure pilot operated directional control valve are connected, the high pressure pressure sensor is connected with pressing the hydraulic fluid port, presses hydraulic fluid port and pressure -measuring opening tube coupling, drain tap and let out the oil pipe connection, the utility model discloses can switch automatically, fast to the range that corresponds, the ressure measurement scope is wide, measurement accuracy is high.
Description
Technical field
This utility model relates to technical field of pressure detection, is specifically related to a kind of multistage pressure automatic
Change detection structure.
Background technology
Pressure transducer, pressure transmitter or Pressure gauge are pressure inspections the most frequently used in fluid system
Survey one of element, the pressure signal of fluid system can be obtained in real time by it.To multiple tube
The hydraulic servo control system of the new clothes equipment such as test tube machine, material seven-roll Abramsen machine carries out pressure inspection
During survey, owing to the operating pressure of these hydraulic systems changes with the difference of load, pressure changes
Scope the widest (the pressure change of many systems is more than more than three times, the highest) and pressure inspection
Survey required precision higher.As a example by pressure transducer, industrial high-precision pressure sensor
Precision be gamut certainty of measurement, monitoring error is taken advantage of equal to the range of pressure transducer in fact
With its precision；When the pressure transducer using wide range measures the operating pressure of above-mentioned hydraulic system
Time, system maximum can be met and measure energy when pressure requirements, hydraulic system are in relatively high workload pressure
Reach the highest measured value precision；But the actual measurement when hydraulic system is in relatively low operating pressure
Value precision is excessively poor；And use the pressure transducer of small-range can be in relatively low work in hydraulic system
Make to reach during pressure (the about range less than 1/3rd) required measured value precision, but
Hydraulic system is in operating mode during relatively high workload pressure, pressure transducer be most likely in fully loaded or
Overload condition, pressure transducer is easily damaged owing to system pressure is too high.To this end, be accomplished by one
Plant the change with pressure tap pressure, corresponding range can be switched to automatically and quickly and contain
Pressure tap is pressed by pressure transducer (or pressure transmitter, Pressure gauge) place of this force value
The multistage pressure of power detection automatically switches and detects device.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide one
Multistage pressure automatically switches and detects structure, can be switched to corresponding range automatically and quickly,
Pressure measurement range width, certainty of measurement are high.
In order to achieve the above object, the technical scheme that this utility model is taked is:
A kind of multistage pressure automatically switches and detects structure, including low pressure pilot operated directional control valve 1 in parallel
With middle pressure pilot operated directional control valve 3, the oil-out A of low pressure pilot operated directional control valve 1 senses with low pressure
Device 2 connects, and the oil inlet P of low pressure pilot operated directional control valve 1 is connected with force feed mouth, and low pressure hydraulic control is changed
Oil return inlet T to valve 1 is connected with drain tap；The oil-out A of middle pressure pilot operated directional control valve 3 with
Middle pressure pressure sensor 4 connects, and the oil inlet P of middle pressure pilot operated directional control valve 3 is connected with force feed mouth,
The oil return inlet T of middle pressure pilot operated directional control valve 3 is connected with drain tap；High-pressure pressure sensor 5 and pressure
Hydraulic fluid port connects, and force feed mouth is connected with pressure tap pipeline, and drain tap and drain mast connect.
Described low pressure pilot operated directional control valve 1 is identical with the structure of middle pressure pilot operated directional control valve 3, low pressure
Pilot operated directional control valve 1 includes valve body 13, valve pocket 14 and non-isometrical spool 15, at non-isometrical spool
It is provided with sealing 16 at valve body 13 oil inlet P of 15 one end, is provided with tune at valve body 13 other end
Joint screw 11, regulation screw 11 is pressed on non-isometrical spool 15 other end through pressure spring 12,
Valve body 13 oil inlet P and valve body 13 oil-out A are by channel connection at X, and valve body 13 goes out
Hydraulic fluid port A and valve body 13 oil return inlet T are by channel connection at Y.
Allowing to arrange pressure set points at the set point value measured less than low-pressure sensor 2,
When the pressure of low pressure pilot operated directional control valve 1 oil-out A reaches this setting value, low pressure passes
The force value that sensor 2 is sent will be no longer participate in observing and controlling；Permitting less than middle pressure pressure sensor 4
Permitted to arrange pressure set points, central pressure pilot operated directional control valve 3 oil-out A at the set point value of measurement
Pressure when reaching this setting value, the force value that middle pressure pressure sensor 4 is sent will no longer be joined
With observing and controlling.
If the hypertonia that need to prevent pressure tap damages high-pressure pressure sensor 5, in high pressure pressure
Increase a corresponding high pressure hydraulic control reversal valve between force transducer 5 and pressure tap to realize.
According to the detection certainty of measurement of pressure tap pressure and range during actually detected, increase or
Reduce different pressures grade pilot operated directional control valve and the quantity of pressure transducer.
The beneficial effects of the utility model are:
1, directly by the pressure sensing of pressure tap pressure switching pilot operated directional control valve to corresponding range
Device, controlling unit is few, switch speed is fast, without manual intervention.
2, the pressure measurement range width of whole device, certainty of measurement height.
3, while realizing continuous detecting pressure tap pressure, it is prevented effectively from by pressure set points
The measurement error brought in pilot operated directional control valve A mouth closing process.
4, pressure transducer turn on automatically oil return when outranging operating mode, both can prevent pressure from passing
Sensor pressure overload, turn avoid pressure transducer and is constantly in high pressure conditions, the clearest and the most definite table
Show that the measured value of this pressure transducer is not involved in observing and controlling.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of this utility model structure.
Fig. 2 is the structural representation of this utility model low pressure pilot operated directional control valve 1.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described further.
With reference to Fig. 1, a kind of multistage pressure automatically switches and detects structure, including low hydraulic fluid in parallel
Control reversal valve 1 and middle pressure pilot operated directional control valve 3, the oil-out A of low pressure pilot operated directional control valve 1 is with low
Pressure pressure sensor 2 connects, and the oil inlet P of low pressure pilot operated directional control valve 1 is connected with force feed mouth,
The oil return inlet T of low pressure pilot operated directional control valve 1 is connected with drain tap；Going out of middle pressure pilot operated directional control valve 3
Hydraulic fluid port A is connected with middle pressure pressure sensor 4, the oil inlet P of middle pressure pilot operated directional control valve 3 with
Force feed mouth connects, and the oil return inlet T of middle pressure pilot operated directional control valve 3 is connected with drain tap；High-pressure
Sensor 5 is connected with force feed mouth, and force feed mouth is connected with pressure tap pipeline, drain tap and drain mast
Connect.
With reference to Fig. 2, described low pressure pilot operated directional control valve 1 and the structure of middle pressure pilot operated directional control valve 3
Identical, low pressure pilot operated directional control valve 1 includes valve body 13, valve pocket 14 and non-isometrical spool 15,
It is provided with sealing 16 at valve body 13 oil inlet P of non-isometrical spool 15 one end, another at valve body 13
One end is provided with regulation screw 11, and regulation screw 11 is pressed in non-isometrical spool through pressure spring 12
On 15 other ends, valve body 13 oil inlet P and valve body 13 oil-out A are by passage at X even
Logical, valve body 13 oil-out A and valve body 13 oil return inlet T are by channel connection at Y.
The most overproof, low for guaranteeing that the detected pressure value of low-pressure sensor 2 does not haves
Allow to arrange pressure set points, when low hydraulic fluid at the set point value measured in low-pressure sensor 2
When the pressure of control reversal valve 1 oil-out A reaches this setting value, low-pressure sensor 2 institute
The force value sent will be no longer participate in observing and controlling；For guaranteeing the pressure detecting of middle pressure pressure sensor 4
Value does not haves the most overproof, is allowing less than middle pressure pressure sensor 4 at the set point value measured
Arranging pressure set points, the pressure of central pressure pilot operated directional control valve 3 oil-out A reaches this setting
During value, the force value that middle pressure pressure sensor 4 is sent will be no longer participate in observing and controlling.
If the hypertonia that need to prevent pressure tap damages high-pressure pressure sensor 5, in high pressure pressure
Increase a corresponding high pressure hydraulic control reversal valve between force transducer 5 and pressure tap to realize.
According to the detection certainty of measurement of pressure tap pressure and range during actually detected, increase or
Reduce different pressures grade pilot operated directional control valve and the quantity of pressure transducer.
The operation principle of pilot operated directional control valve is:
The operation principle of pressure pilot operated directional control valve low, middle is identical, and the work of low pressure pilot operated directional control valve is former
Reason is produced by fluid pressure by: low pressure pilot operated directional control valve 1 on non-isometrical spool 15 two ends
The comparison control of the pressure spring power that raw power difference produces through pressure spring 12 with regulation screw 11
The action of non-isometrical spool 15, with P1Represent the pressure of pressure tap, D1Represent non-isometrical spool 15
Big footpath, d1Represent non-isometrical spool 15 path, Ft1And Ft2Represent that pressure spring sets up pressure respectively
The lower limit of power and higher limit, then as this P1·(D1 2-d1 2)×(π/4)≤Ft1Time, low pressure liquid controlled reversing
Oil-out A passage at X of valve 1 communicates with oil inlet P, now low-pressure sensor
2 actual values that pressure tap pressure can be detected from oil-out A；With putting forth effort being gradually increased of difference,
Pressure spring 12 compresses, and non-isometrical spool 15 moves, and makes the opening of oil-out A gradually subtract
Little；Work as P1·(D1 2-d1 2) × (π/4) ＞ Ft2Time, the oil-out A of low pressure pilot operated directional control valve 1 closes,
Now the pressure of oil-out A is equivalent to what the permission of coupled low-pressure sensor 2 was measured
Set point value, this value is slightly below low-pressure sensor 2 and measures the higher limit of scope；When power difference is entered
When one step is gradually increased, oil-out A passage at Y communicates with oil return inlet T, low pressure
Sensor 2 off-load.
The operation principle of this utility model multistage pressure automatic switchover detection structure is:
In course of normal operation, when the pressure of pressure tap is less than the pressure of low-pressure sensor 2
During setting value, the oil-out A of low pressure pilot operated directional control valve 1 and middle pressure pilot operated directional control valve 3 all locates
In opening, low-pressure sensor 2, middle pressure pressure sensor 4, high-pressure sense
Device 5 all has the pressure tap force value detected to send；Owing to the precision of each pressure transducer is identical
And low-pressure sensor 2 range is minimum, measured value precision is the highest, with low-pressure sensor
2 force value sent are the pressure measured value of pressure tap.When the pressure of pressure tap is more than low pressure
The pressure set points of pressure transducer 2, less than the pressure set points of middle pressure pressure sensor 4 time,
The oil-out A of low pressure pilot operated directional control valve 1 closes and the oil-out A of middle pressure pilot operated directional control valve 3
Still being held open, the pressure of low-pressure sensor 2 becomes oil return with the rising of pressure tap pressure
Pressure, middle pressure pressure sensor 4, high-pressure pressure sensor 5 all have detected pressure tap
Force value sends；Also due to middle pressure pressure sensor 4 range is less, measured value precision is higher,
The force value sent with the middle pressure pressure sensor 4 pressure measured value as pressure tap.Work as pressure measurement
When the pressure of mouth is more than the pressure set points of middle pressure pressure sensor 4, middle pressure pilot operated directional control valve 3
Oil-out A be also switched off, now low-pressure sensor 2 and middle pressure pressure sensor 4
Pressure becomes return pressure with the rising of pressure tap pressure, the pressure that high-pressure pressure sensor 5 sends
Force value is the pressure measured value of pressure tap.
Claims (5)
1. a multistage pressure automatic switchover detection structure, including low pressure liquid controlled reversing in parallel
Valve (1) and middle pressure pilot operated directional control valve (3), it is characterised in that: low pressure pilot operated directional control valve (1)
Oil-out A be connected with low-pressure sensor (2), low pressure pilot operated directional control valve (1)
Oil inlet P is connected with force feed mouth, the oil return inlet T of low pressure pilot operated directional control valve (1) and drain tap
Connect；The oil-out A of middle pressure pilot operated directional control valve (3) is with middle pressure pressure sensor (4) even
Connecing, the oil inlet P of middle pressure pilot operated directional control valve (3) is connected with force feed mouth, middle pressure liquid controlled reversing
The oil return inlet T of valve (3) is connected with drain tap；High-pressure pressure sensor (5) is with force feed mouth even
Connecing, force feed mouth is connected with pressure tap pipeline, and drain tap and drain mast connect.
A kind of multistage pressure the most according to claim 1 automatically switches and detects structure, its
It is characterised by: described low pressure pilot operated directional control valve (1) and the knot of middle pressure pilot operated directional control valve (3)
Structure is identical, and low pressure pilot operated directional control valve (1) includes valve body (13), valve pocket (14) and non-isometrical
Spool (15), is provided with at valve body (13) oil inlet P of non-isometrical spool (15) one end
Seal (16), be provided with regulation screw (11), regulation screw (11) at valve body (13) other end
It is pressed on non-isometrical spool (15) other end through pressure spring (12), valve body (13) oil-feed
Mouth P and valve body (13) oil-out A is by channel connection at X, valve body (13) oil-out
A and valve body (13) oil return inlet T are by channel connection at Y.
A kind of multistage pressure the most according to claim 1 automatically switches and detects structure, its
It is characterised by: allowing to arrange pressure at the set point value measured less than low-pressure sensor (2)
Power setting value, when the pressure of low pressure pilot operated directional control valve (1) oil-out A reaches this setting value,
The force value that low-pressure sensor (2) is sent will be no longer participate in observing and controlling；Less than middle pressure
Pressure transducer (4) allows to arrange pressure set points, central hydraulic fluid control at the set point value measured
When the pressure of reversal valve (3) oil-out A reaches this setting value, middle pressure pressure sensor (4)
The force value sent will be no longer participate in observing and controlling.
A kind of multistage pressure the most according to claim 1 automatically switches and detects structure, its
It is characterised by: if need to prevent the hypertonia of pressure tap from damaging high-pressure pressure sensor (5),
Between high-pressure pressure sensor (5) and pressure tap, increase a corresponding high pressure hydraulic control change
Realize to valve.
A kind of multistage pressure the most according to claim 1 automatically switches and detects structure, its
It is characterised by: the certainty of measurement according to detection pressure tap pressure and range during actually detected,
Different pressures grade pilot operated directional control valve and the quantity of pressure transducer are increased or decreased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620410725.2U CN205605541U (en) | 2016-05-09 | 2016-05-09 | Multistage pressure automatic switch -over detects structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620410725.2U CN205605541U (en) | 2016-05-09 | 2016-05-09 | Multistage pressure automatic switch -over detects structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205605541U true CN205605541U (en) | 2016-09-28 |
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ID=56969888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620410725.2U Active CN205605541U (en) | 2016-05-09 | 2016-05-09 | Multistage pressure automatic switch -over detects structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN205605541U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805087A (en) * | 2016-05-09 | 2016-07-27 | 中国重型机械研究院股份公司 | Multistage-pressure automatic switching detection device |
| CN107607251A (en) * | 2017-09-08 | 2018-01-19 | 上海工业自动化仪表研究院有限公司 | A kind of differential pressure or pressure transmitter with double-range |
-
2016
- 2016-05-09 CN CN201620410725.2U patent/CN205605541U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805087A (en) * | 2016-05-09 | 2016-07-27 | 中国重型机械研究院股份公司 | Multistage-pressure automatic switching detection device |
| CN107607251A (en) * | 2017-09-08 | 2018-01-19 | 上海工业自动化仪表研究院有限公司 | A kind of differential pressure or pressure transmitter with double-range |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |