CN205877306U - Relief valve for pump and double -screw pump thereof - Google Patents
Relief valve for pump and double -screw pump thereof Download PDFInfo
- Publication number
- CN205877306U CN205877306U CN201521137324.6U CN201521137324U CN205877306U CN 205877306 U CN205877306 U CN 205877306U CN 201521137324 U CN201521137324 U CN 201521137324U CN 205877306 U CN205877306 U CN 205877306U
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- Prior art keywords
- valve
- relief valve
- spool
- pump
- valve seat
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- 206010008469 Chest discomfort Diseases 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 12
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000003019 stabilising effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Safety Valves (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The utility model provides a relief valve for pump and double -screw pump thereof belongs to spiral shell sucker -rod pumping technical field. Relief valve for the pump, including valve body, case, valve cap and spring, be equipped with high pressure chest and low pressure chamber in the valve body, be equipped with the disk seat between high pressure chest and the low pressure chamber, it has the disk seat hole to open on the disk seat, and high pressure chest and low pressure chamber are linked together through the disk seat hole. Case and spring setting are in the high pressure chest of valve body, the case is cylindric, and its one end is equipped with the opening, the one end of spring compresses tightly the contact with the interior bottom surface of case. The application provides a when the relief valve cuts out, case and disk seat hole sealing contact. The application provides a relief valve adopts the inner flow -type structure, places case and spring in the high pressure chest of valve body, and under the same regulation cracking pressure value, the spring wire footpath that this relief valve was chooseed for use is directly little more a lot of than prior art's spring wire, does benefit to spring lectotype and relief valve manufacture.
Description
Technical field
This utility model relates to screw pump technology field, particularly relates to a kind of pump relief valve and uses this relief valve
Quimby pump.
Background technology
During pump operation, block if there is discharge line or be not switched on the reasons such as discharge valve, then will draw
The pressure playing outlet side of pump steeply rises, and pump overload may be caused to destroy, and damage motor simultaneously time serious.In order to prevent double spiral shell
Bar pump overload is destroyed, and the solution generally used is configuration relief valve on pump.Pump is configured with relief valve just can discharge pressure
When power exceedes the value of certain regulation, open relief valve and the high-pressure medium of outlet side is directed into entrance point, so that the pressure of outlet side
Power declines, it is to avoid outlet side further rise in pressure, reaches the effect of overload protection.
The relief valve that existing Quimby pump is used is outer-flowing type structure, and the spool of relief valve and spring are placed on low pressure chamber
In, low pressure chamber is connected with pump inlet.This style of relief valve has two shortcomings:
1, safety valve spring line footpath selects with the change of relief valve specified unlatching pressure substantially, when the specified unlatching pressure of design
Time higher, it is necessary to select the spring in the biggest line footpath, being unfavorable for the processing and manufacturing of relief valve, relief valve pretension pressure regulation simultaneously is the most not
Convenient.
2, after relief valve is opened, cause flow stream velocity to change owing to relief valve valve port area of passage changes, cause
The change of liquid stream momentum and produce hydraulic power.This hydraulic power is in opposite direction with flow stream velocity, and therefore the direction of hydraulic power is always
The opening trying hard to make relief valve approaches to turn off, and this allows for relief valve and is difficult to open.In this case, high pressure chest is accomplished by higher
Pressure just can make relief valve standard-sized sheet, it is possible to cause pump or motor overload to damage.
Utility model content
Problem to be solved in the utility model is that existing pump relief valve needs to be not easy to processing, pretension pressure regulation inconvenience,
It is difficult to during use open.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is: provide a kind of pump relief valve.Described
Pump relief valve, including valve body, spool, bonnet and spring, is provided with high pressure chest and low pressure chamber in described valve body, described high pressure chest and
Being provided with valve seat between low pressure chamber, described valve seat has valve seat orifice, high pressure chest is connected by valve seat orifice with low pressure chamber.Described valve
Core and spring are arranged in the high pressure chest of valve body；Described spool is cylindric, and its one end is provided with opening, one end of described spring with
The inner bottom of spool is pressed into contact with.When the relief valve that the application provides cuts out, spool is in sealing contact with valve seat orifice.
Further, described pump relief valve also includes the valve pocket of guide-localization spool, and it is set in spool away from valve seat
The one end in hole.Described valve pocket is fixedly connected with the valve body, and the axis of valve pocket, the axis of spool coincide with the axis of valve seat orifice.
Further, when described relief valve cuts out, spool and valve seat orifice are line contact sealing.
Preferably, described spool external diameter is more than or equal to 1.1, less than or equal to 1.5 with the diameter ratio of valve seat orifice.
Further, described valve seat orifice has chamfering towards one end of spool, when described relief valve cuts out, and spool and valve seat
The contact of face, hole seals.
Preferably, the diameter ratio after described spool external diameter and valve seat orifice chamfering is more than or equal to 1.1, less than or equal to 1.5.
Preferably, described spool is provided with chamfering towards one end of valve seat orifice.
The application also provides for a kind of Quimby pump using above-mentioned pump relief valve, the valve body of described relief valve and the pump housing
For integral type structure or split-type structural.
Preferably, described valve body is connected with pump housing casting, welds or Flange joint.
Preferably, the outlet of the low pressure chamber of described relief valve is connected with the low-pressure side of the pump housing.
This utility model has the advantage that with good effect:
1. the relief valve that the application provides, uses in-flow structure, spool and spring is placed in the high pressure chest of valve body,
Under identical regulation opens force value, the initial tension of spring required for relief valve in the application can be less than prior art
A lot, therefore the spring wire footpath of the spring line diameter ratio prior art selected by the relief valve of the application is much smaller, beneficially spring
Type selecting and relief valve manufacture processing.
2. when the relief valve that the application provides uses, after high pressure chest fluid pressure reaches to open pressure, by relief valve
When opening, to cross hydraulic power direction produced by flowing liquid consistent with relief valve opening direction for valve port.Therefore, compared with prior art,
The relief valve of the application is easier to standard-sized sheet, thus preferably reaches the purpose protecting pump not damaged by overload.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the pump of relief valve and installation relief valve in prior art.
Fig. 2 is the generalized section of Fig. 1.
Fig. 3 is the structural representation of relief valve in prior art.
Fig. 4 is the structural representation of relief valve in the embodiment of the present application 1.
Fig. 5 is the structural representation of relief valve in the embodiment of the present application 2.
In figure: 1-Quimby pump, 2-relief valve, 201-valve body, 202-bonnet, 203-valve pocket, 204-spool, 205-valve seat
Hole, 206-spring, 207-spring base, 208-pressure regulation bar, 209-bolt, H-high pressure chest, L-low pressure chamber.
Detailed description of the invention
In order to be better understood from this utility model, below in conjunction with specific embodiments and the drawings, this utility model is entered one
The description of step.
As shown in Figure 1-Figure 3, relief valve 2 of the prior art and Quimby pump 1, relief valve 2 is outer-flowing type structure, i.e. pacifies
The spool 204 of full valve 2 is arranged in low pressure chamber L of valve body 201 with spring 206, and low pressure chamber L is connected with pump inlet.
The critical condition that relief valve is opened is:
In formula: pSThe pressure of high pressure chest；
p2The pressure of low pressure chamber；
d1Valve seat orifice diameter；
FSInitial tension of spring.
This style of relief valve has two shortcomings:
1, safety valve spring line footpath selects with the change of relief valve specified unlatching pressure substantially, when the specified unlatching pressure of design
Time higher, it is necessary to select the spring in the biggest line footpath, being unfavorable for the processing and manufacturing of relief valve, relief valve pretension pressure regulation simultaneously is the most not
Convenient.
2, after relief valve is opened, cause flow stream velocity to change owing to relief valve valve port area of passage changes, cause
The change of liquid stream momentum and produce hydraulic power.This hydraulic power is in opposite direction with flow stream velocity, and therefore the direction of hydraulic power is always
The opening trying hard to make relief valve approaches to turn off, and this allows for relief valve and is difficult to open.In this case, high pressure chest is accomplished by higher
Pressure just can make relief valve standard-sized sheet, it is possible to cause pump or motor overload to damage.
The pump relief valve 2 that the application provides, including valve body 201, bonnet 202, spool 204, spring 207 and pressure regulation bar
209.Bonnet 202 is connected by bolt 2010 is fixing with valve body 201.High pressure chest H and low pressure chamber L, high pressure chest H it is provided with in valve body 2
And between low pressure chamber L, it is provided with valve seat 205, valve seat 205 has valve seat orifice 206, high pressure chest H and low pressure chamber L by valve seat orifice 206
It is connected.Relief valve in the application is in-flow structure, and spool 204 and spring 207 are arranged in the high pressure chest H of valve body 201.
Spool 204 is cylindric, and its one end is provided with opening.When relief valve 2 is closed, spool 204 and valve seat orifice
205 are in sealing contact.
In order to lead further to position spool 204, it is ensured that spool 204 and the axis of valve seat orifice 205 when relief valve 2 is opened
On the same line, in valve body 201, valve pocket 203, the axis of valve pocket 203, axis and the valve seat orifice 206 of spool 204 it are additionally provided with
Axis coincide.Valve pocket 203 is set in spool 204 one end away from valve seat orifice 206, fixes with valve body 201 and is connected, with spool
204 movable sealings connect.
Spool 204 is provided with chamfering towards one end of valve seat orifice 206 along the excircle of spool 204.
One end of spring 207 is arranged in spool 204 cylinder, is pressed into contact with the inner bottom surface of spool 204.Spring 207
The other end stretches out spool, is fixed on spring base 208.Having a screwed hole on spring base 208, one end of pressure regulation bar 209 has
The external screw thread closed with this corresponding threaded holes.The other end of pressure regulation bar 209 stretches out bonnet 202, it is simple to pressure regulation operates.During use, logical
Toning depression bar 209 and spring base 208 carry out pretension pressure regulation to spring 207.
The application also provide for using the Quimby pump of safety valve, the valve body of relief valve 2 and the pump housing be integral type structure or
Split-type structural.If the valve body of relief valve 2 201 and the pump housing are integral type structure, can be that casting connects or welding, one-body molded.
If valve body 201 is split type connection, flange bolt can be used to connect.The outlet of low pressure chamber L of relief valve 2 can be with the entering of the pump housing
Mouth is connected, it is also possible to is not connected with the entrance of the pump housing, and is connected with other low-pressure sides of the pump housing.
Below in conjunction with embodiment, the application is described further.
Embodiment 1
As it is shown on figure 3, in the present embodiment, valve seat orifice 206 is without chamfering, close with valve seat 205 linear contact lay at the chamfering of spool 204
Envelope.Spool 204 outside diameter d0Diameter d with valve seat orifice 2061Ratio more than or equal to 1.1, less than or equal to 1.5, applicant is through repeatedly trying
Checking draws, spool 204 outside diameter d0Diameter d with valve seat orifice 2061Ratio in the range of this time, the performance of relief valve 2
Most preferably.
Spool 204 outer bottom at the lifting surface area of high pressure chest H is:
In formula: d0---the external diameter of spool；
d1---the diameter of valve seat orifice.
The critical condition that so relief valve is opened is:
In formula: pS---the pressure of high pressure chest H；
p2---the pressure of low pressure chamber L；
FS---initial tension of spring.
Thus like unlatching pressure ps, use the relief valve Quimby pump of the present embodiment, the spring required for relief valve 2
Pretightning force FsCan be than pretightning force F of spring of the prior artsMuch smaller, say, that selected by the relief valve 2 in the present embodiment
The line footpath of the line footpath of spring also the most corresponding spring more total than prior art is much smaller, it is simple to the manufacture processing of relief valve 2.
During assuming that relief valve 2 is opened, the flow velocity of porch is v1, pressure be p1；The flow velocity in exit is v2, pressure be p2；
The pressure of high pressure chest H porch is pS, the flow velocity in high pressure chest H is vs。
By fluid force Xue Zhi, when liquid stream flows through valve port, owing to flow stream velocity changes, will there is liquid stream active force (liquid
Power) act on spool.Hydraulic power in relief valve 2 refers to the timing of relief valve 2 opening one, due to flow through spool 204 with
The change of the liquid stream area of valve seat orifice 206 opening and cause the change of flow stream velocity, cause the change of liquid stream momentum to produce
One active force, this active force is alternatively referred to as dynamical reaction.This effect force can be decomposed into axial thrust load and cross component force.
Owing to spool 204 and valve seat orifice 206 are all cylindrical, therefore the cross component force along spool 204 circumference cancels each other, and surges
The most remaining axial thrust load of power.
The axial thrust load following formula of hydraulic power calculates:
Fa=ρ Qv cos α
In formula: ρ---fluid density；
Q---flows through the flow of spool and valve seat orifice opening；
V---is the flow stream velocity of spool and valve seat orifice opening part；
α---for spool semi-cone angle.
Owing to hydraulic power is a dynamical reaction, therefore the axial thrust load direction of hydraulic power is always divided with the axial of flow stream velocity
Velocity attitude is contrary.Therefore no matter spool 204 is arranged on high pressure chest H or low pressure chamber L, always the axial thrust load direction of hydraulic power
High pressure chest H direction is pointed to by low pressure chamber L.
After the relief valve 2 of the present embodiment is opened, during liquid stabilising flowing, apply momentum rule, act on relief valve 2 spool
Stable state axial thrust P on 204sFor:
PS=P1+Fq
=(pS-p2)A1+ρQv2cosα
In formula: P1---the hydraulic coupling of spool outer bottom,
Fq---liquid flows through the hydraulic power of valve port.
Due to hydraulic power FqDirection and hydraulic coupling P1Direction is identical, and the direction of two power is all to make relief valve 2 opening tend to complete
Opening, therefore the present embodiment is for the relief valve 2 of Quimby pump, during line contact sealing, than existing skill under the unlatching pressure of regulation
The relief valve of the Quimby pump of art more easily reachs full-gear, so when high pressure chest H pressure exceedes authorized pressure, uses this
Relief valve 2 meeting of embodiment backflow quickly, it is to avoid outlet side of pump pressure continues to rise and cause pump to transship.
Embodiment 2
As shown in Figure 4, in the present embodiment, relief valve 2 contacts closed type for face.The valve seat orifice 206 of relief valve 2 has down
Angle, the chamfering of spool 204 end contacts sealing with the fillet surface of valve seat orifice 206.Spool 204 outside diameter d0With valve seat orifice 206 chamfering
After diameter d2Ratio d0/d2It is 1.1～1.5.Applicant draws through test of many times checking, spool 204 outside diameter d0With valve seat orifice
The chamfering diameter d of 2062Ratio in the range of this time, the performance of relief valve 2 is optimal.
Spool 204 outer bottom at the lifting surface area of high pressure chest H is:
In formula: d0---the external diameter of spool；
d2---the diameter after valve seat orifice chamfering.
The critical condition that so relief valve is opened is:
In formula: pS---the pressure of high pressure chest H；
p2---the pressure of low pressure chamber L；
FS---initial tension of spring.
Thus like unlatching pressure ps, use the relief valve Quimby pump of the present embodiment, the spring required for relief valve 2
Pretightning force FsCan be than pretightning force F of spring of the prior artsMuch smaller, say, that selected by the relief valve 2 in the present embodiment
The line footpath of the line footpath of spring also the most corresponding spring more total than prior art is much smaller, it is simple to the manufacture processing of relief valve 2.
After relief valve 2 is opened, during liquid stabilising flowing, applying momentum rule, act on relief valve 2 spool 204 is steady
State axial thrust PsFor:
PS=P1+P2+Fq
=(pS-p2)A1+∫p22πrdr+ρQv2cosα
In formula: P1---the hydraulic coupling of spool outer bottom；
P2---the pressure integration in valve seat orifice chamfering；
Fq---liquid flows through the hydraulic power of valve port.
Due to the pressure integration P in the Section 2 chamfering of stable state axial force expression formula2With hydraulic coupling P1Direction is identical, and
Section 3 item hydraulic power Fs and hydraulic coupling P1Direction is the most identical, and the direction of three power is all to make relief valve opening tend to standard-sized sheet, because of
The face contact sealed relief valve of the Quimby pump of this present embodiment is under the unlatching pressure of regulation, than the Quimby pump of prior art
Relief valve more easily reach full-gear, so use the relief valve of the present embodiment when high pressure chest pressure exceedes authorized pressure
Meeting backflow quickly, it is to avoid outlet side of pump pressure continues to rise and cause pump to transship.
Above embodiment of the present utility model has been described in detail, but described content be only of the present utility model preferably
Embodiment, it is impossible to be considered for limiting practical range of the present utility model.All impartial changes made according to this utility model scope
Change and improvement etc., within all should still belonging to this patent covering scope.
Claims (10)
1. a pump relief valve, including valve body, spool, bonnet and spring, is provided with high pressure chest and low pressure chamber, institute in described valve body
State and between high pressure chest and low pressure chamber, be provided with valve seat, described valve seat has valve seat orifice, high pressure chest and low pressure chamber by valve seat orifice phase
Connection, it is characterised in that: described spool and spring are arranged in the high pressure chest of valve body；Described spool is cylindric, and its one end sets
Opening, one end of described spring is had to be pressed into contact with the inner bottom surface of spool；
When relief valve cuts out, spool is in sealing contact with valve seat orifice.
Pump relief valve the most according to claim 1, it is characterised in that: also include the valve pocket of guide-localization spool, its set
It is located at spool one end away from valve seat orifice；Described valve pocket is fixedly connected with the valve body, the axis of valve pocket, the axis of spool and valve seat orifice
Axis coincide.
Pump relief valve the most according to claim 1 and 2, it is characterised in that: when described relief valve cuts out, spool and valve seat
Hole is line contact sealing.
Pump relief valve the most according to claim 3, it is characterised in that: described spool external diameter and the diameter ratio of valve seat orifice
More than or equal to 1.1, less than or equal to 1.5.
Pump relief valve the most according to claim 1 and 2, it is characterised in that: described valve seat orifice is opened towards one end of spool
Having chamfering, when described relief valve cuts out, spool contacts sealing with valve seat orifice face.
Pump relief valve the most according to claim 5, it is characterised in that: straight after described spool external diameter and valve seat orifice chamfering
The ratio in footpath is more than or equal to 1.1, less than or equal to 1.5.
7. according to the arbitrary described pump relief valve of claim 1,2,4,6, it is characterised in that: described spool is towards valve seat orifice
One end is provided with chamfering.
8. a Quimby pump, uses the pump relief valve as described in claim 1-7 is arbitrary, it is characterised in that: described safety
The valve body of valve and the pump housing are integral type structure or split-type structural.
Quimby pump the most according to claim 8, it is characterised in that: described valve body is connected with pump housing casting, welds or method
Blue connection.
Quimby pump the most according to claim 8 or claim 9, it is characterised in that: the outlet of the low pressure chamber of described relief valve and pump
The low-pressure side of body is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521137324.6U CN205877306U (en) | 2015-12-29 | 2015-12-29 | Relief valve for pump and double -screw pump thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521137324.6U CN205877306U (en) | 2015-12-29 | 2015-12-29 | Relief valve for pump and double -screw pump thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205877306U true CN205877306U (en) | 2017-01-11 |
Family
ID=57686345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521137324.6U Expired - Fee Related CN205877306U (en) | 2015-12-29 | 2015-12-29 | Relief valve for pump and double -screw pump thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205877306U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485385A (en) * | 2015-12-29 | 2016-04-13 | 天津华科螺杆泵技术有限公司 | Safety valve and two-screw pump employing same |
-
2015
- 2015-12-29 CN CN201521137324.6U patent/CN205877306U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485385A (en) * | 2015-12-29 | 2016-04-13 | 天津华科螺杆泵技术有限公司 | Safety valve and two-screw pump employing same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 |