CN102536794B - Self-lubricating single-screw pump - Google Patents
Self-lubricating single-screw pump Download PDFInfo
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- CN102536794B CN102536794B CN201110462876.4A CN201110462876A CN102536794B CN 102536794 B CN102536794 B CN 102536794B CN 201110462876 A CN201110462876 A CN 201110462876A CN 102536794 B CN102536794 B CN 102536794B
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Abstract
A self-lubricating single-screw pump relates to screw pumps, in particular to single-screw pumps, and comprises a stator, a single screw, an inlet three-way valve, a spring and a universal joint, wherein one end of the inlet three-way valve is detachably connected with the medium inlet end of a single screw set in a sealed manner; the medium inlet end of a liquid storage joint is detachably connected with the medium outlet end of the single screw set in a sealed manner; a hole, through which a medium flows, is formed in the central shaft of the single screw from the medium outlet end to the medium inlet end of the single screw set; a control valve movably matched with the hole is mounted at one end of the hole, and comprises a valve core and a spring; a through hole is formed in one end of the valve core; and the reflow hole on the single screw is communicated with both the other end of the hole and the inner cavity of the inlet three-way valve at the same time. The self-lubricating single-screw pump has the advantage that the self-lubricating is fulfilled during dry running while normal work is guaranteed, so as to prevent damage on the self-lubricating single-screw pump and prolong the service life of the self-lubricating single-screw pump.
Description
Technical field
The present invention relates to screw pump, particularly relate to helical rotor pump.
Background technique
It is secondary that existing helical rotor pump comprises the singe screw that elastomer stator and singe screw form, stator is elastomer stator or rigidity stator, the medium inlet end of import threeway one end and singe screw pair seals and removably connects, its deficiency is axial length, when no liquid media flow in pump operates, stator and the mutual dry friction of singe screw, damage helical rotor pump, have impact on the working life of helical rotor pump.
Summary of the invention
The object of the invention is to, for above-mentioned the deficiencies in the prior art, provide a kind of self-lubricating single-screw pump, this pump can not only be realized and normally work, and selflubricating when running done by this pump can be realized, prevent this pump from damaging, improve its working life.
In order to realize foregoing invention object, technological scheme of the present invention is:
The present invention includes stator, singe screw, import threeway, spring, universal joint, the medium inlet end of import threeway one end and singe screw pair seals and removably connects, the medium inlet end of liquid storage joint and the media outlet end of singe screw pair seal and removably connect, liquid storage joint is elbow-shaped joint or barrel-shaped joint, the media outlet end of liquid storage joint is higher than the top of stator, singe screw central shaft from the media outlet end of singe screw pair to entry end has the hole of a logical medium, this hole is circular hole or regular polygon hole, at the control valve that the hole of singe screw of the media outlet end being positioned at singe screw pair coordinates built with activity, this control valve comprises spool and spring, there is through hole spool one end, the return port all simultaneously communicated with the hole on singe screw central shaft and import threeway inner chamber is had at the singe screw end of the medium inlet end of singe screw pair.
When helical rotor pump normally works, medium enters pump chamber by import threeway, by the rotary motion of singe screw, is seen off after being transported to liquid storage joint after medium supercharging by external pipeline, the pressure that medium in liquid storage joint acts on spool is greater than spring force, and control valve is closed.When the dry running of helical rotor pump, the pressure drop in liquid storage joint, the pressure acted on spool of the medium in liquid storage joint is less than the elastic force of spring, and spool is opened under spring force effect.Path is formed by the hole on the through hole on spool and singe screw central shaft and the return port on singe screw between liquid storage joint and import threeway, medium in liquid storage joint under gravity, import threeway is flowed into by the through hole in singe screw and return port, until the liquid level in liquid storage joint and the level balance in import threeway, the height of this liquid level should higher than stator center line height, when there being liquid in medium, because the normal quantity delivered of helical rotor pump is much larger than return port return flow, liquid storage joint internal pressure raises, control valve is closed, this pump enters normal operating condition, helical rotor pump is made to be in selflubricating state all the time.
Technique effect of the present invention is: this pump can not only normally work, and also can selflubricating when dry running, prevents this pump from damaging, improves its working life.
Accompanying drawing explanation
Sectional view when Fig. 1 is spool of the present invention closedown,
Sectional view when Fig. 2 is spool of the present invention unlatching,
Fig. 3 is the partial sectional view of the through hole in singe screw,
Fig. 4 is the A direction view in Fig. 3, and Fig. 5 is the B-B sectional view in Fig. 3,
Fig. 6 is a kind of main sectional view of spool, and Fig. 7 is the left view of Fig. 6,
Fig. 8 is the plan view of spring, and Fig. 9 is the main sectional view of liquid storage joint,
Figure 10 is the main sectional view of another kind of spool, and Figure 11 is the left view for Figure 10.
At Fig. 1, Fig. 2, Fig. 3, Fig. 6, Fig. 8, Fig. 9, Tu10Zhong:
1, liquid storage joint 2, spool 3, spring
4, singe screw 4-1, through hole 4-2, return port
5, elastomer stator 6, universal joint 7, import threeway
When a represents that dry running occurs, when closing in the hole of control valve in singe screw and be about to open, the liquid level initial instant position in liquid storage joint,
B represents when opening in the hole of control valve in singe screw, the level balance position of the liquid level in liquid storage joint and import threeway.
Embodiment
Embodiment 1
This helical rotor pump comprises stator, singe screw, import threeway, spring, universal joint, liquid storage joint, spool, the medium inlet end of import threeway one end and singe screw pair seals and removably connects, and liquid storage joint is left, right-hand member outer side surface all has flange disc, the outer diameter of left flange disc, thickness is respectively 220mm, 22mm, on left flange disc diameter be 180mm be circumferentially evenly distributed with the round tube hole that 8 diameters are 18mm, the outer diameter of right flange disc, thickness is respectively 340mm, 24mm, on right flange disc diameter be 295mm be circumferentially evenly distributed with the round tube hole that 8 diameters are 22mm, the medium inlet end of liquid storage joint and the media outlet end of singe screw pair seal and removably connect, and liquid storage joint is zigzag joint, liquid storage joint upper, the central shaft of hypomere be parallel to each other and on, the central shaft of hypomere is crossing with the central axis in stage casing, a round tube hole is had in liquid storage joint, the Circularhole diameter of the intersection from the epimere left side of liquid storage joint to epimere and stage casing is 100mm, and the Circularhole diameter in stage casing and hypomere is 200mm, the length of liquid storage joint, highly be respectively 500mm, 600mm, the singe screw central shaft from the media outlet end of singe screw pair to entry end has the hole of a logical medium, the through hole namely in singe screw, and this through hole is by the first circular hole, second circular hole and the 3rd circular hole are formed, the diameter of the first circular hole, length is respectively 100mm, 80mm, the diameter of the second circular hole, length is 42mm respectively, 62mm, the diameter of the second circular hole left end to be monolateral cone angle be 45 ° of frustoconic shape, the 3rd circular hole, length is respectively 32mm, 800mm, have the return port all simultaneously communicated with the hole on singe screw central shaft and import threeway inner chamber at the singe screw end of the medium inlet end of singe screw pair, this return port is decussation round tube hole, and the diameter of this round tube hole is 32mm, at the control valve that the hole of singe screw of the media outlet end being positioned at singe screw pair coordinates built with activity, this control valve comprises spool and spring, the first cylinder on spool, second cylinder and the 3rd cylinder are cylinder, the diameter of the first cylinder, length is respectively 98mm, 20mm, the annulus of the first cylinder between the first cylinder and the second cylinder is evenly distributed with four central angles and is 90 ° and inner diameter is 65mm, the ring through hole of the equal 90mm of outer diameter, the diameter of the second cylinder, length is respectively 65mm, 45mm, the right-hand member of the second cylinder is monolateral cone angle is 45 ° of round platforms, the diameter of three cylindrical, length is respectively 34mm, 20mm, stage clip 2 × 38 × 80-2GB2089-1994-II selected by spring
a-Zn.
When helical rotor pump normally works, medium enters pump chamber by import threeway, by the rotary motion of singe screw, is seen off after being transported to liquid storage joint after medium supercharging by external pipeline, the pressure that medium in liquid storage joint acts on spool is greater than spring force, and control valve is closed.When the dry running of helical rotor pump, the pressure drop in liquid storage joint, the pressure acted on spool of the medium in liquid storage joint is less than the elastic force of spring, and spool is opened under spring force effect.Path is formed by the return port on the hole of medium logical on the through hole on spool and singe screw central shaft and singe screw between liquid storage joint and import threeway, medium in liquid storage joint under gravity, import threeway is flowed into by the through hole in singe screw and return port, until the liquid level in liquid storage joint and the level balance in import threeway, the height of this liquid level should higher than stator center line height, when there being liquid in medium, because the normal quantity delivered of helical rotor pump is much larger than return port return flow, liquid storage joint internal pressure raises, control valve is closed, this pump enters normal operating condition, helical rotor pump is made to be in selflubricating state all the time.
Embodiment 2
This helical rotor pump comprises stator, singe screw, import threeway, universal joint, spring, liquid storage joint, spool, the medium inlet end of import threeway one end and singe screw pair seals and removably connects, the left and right end outer side surface of liquid storage joint all has flange disc, outer diameter, the thickness of left flange disc are respectively 340mm, 24mm, on left flange disc diameter be 295mm be circumferentially evenly distributed with the round tube hole that 12 diameters are 22mm, the outer diameter of right flange disc, thickness is respectively 580mm, 32mm, on right flange disc diameter be 525mm be circumferentially evenly distributed with the round tube hole that 16 diameters are 30mm, the medium inlet end of liquid storage joint and the media outlet end of singe screw pair seal and removably connect, liquid storage joint is zigzag, liquid storage joint upper, the central shaft of hypomere be parallel to each other and on, the central shaft of hypomere is crossing with the central axis in stage casing, a round tube hole is had in liquid storage joint, the Circularhole diameter of the intersection from the epimere left side of liquid storage joint to epimere and stage casing is 200mm, Circularhole diameter in stage casing and hypomere is 400mm, the length of liquid storage joint, highly be respectively 1000mm, 1200mm, singe screw central shaft from the media outlet end of singe screw pair to entry end has the hole of a logical medium, namely the through hole in singe screw, this through hole is by the first circular hole, second circular hole and the 3rd circular hole are formed, the diameter of the first circular hole, length is respectively 150mm, 120mm, the diameter of the second circular hole, length is respectively 55mm, 75mm, the diameter of the 3rd circular hole, length is respectively 40mm, 1100mm, the return port all simultaneously communicated with the hole on singe screw central shaft and import threeway inner chamber is had at the singe screw end of the medium inlet end of singe screw pair, this return port is decussation round tube hole, the diameter of this round tube hole is 40mm, at the control valve that the hole of singe screw of the media outlet end being positioned at singe screw pair coordinates built with activity, this control valve comprises spool and spring, the first cylinder on spool, second cylinder and the 3rd cylinder are cylinder, the diameter of the first cylinder, length is respectively 148mm, 35mm, the central shaft of the first cylinder there is a diameter, length is respectively 50mm, the circular hole of 73mm, second cylindrical radial has diameter to be the decussation circular hole of 30mm, circular hole on the central shaft of the first cylinder communicates with the decussation circular hole in the second cylinder, the diameter of the second cylinder, length is respectively 70mm, 57mm, the right-hand member of the second cylinder is monolateral cone angle is 45 ° of round platforms, the diameter of three cylindrical, length is respectively 45mm, 15mm, stage clip 4 × 50 × 100-2GB2089-1994-II selected by spring
a-Zn.
When helical rotor pump normally works, medium enters pump chamber by import threeway, by the rotary motion of singe screw, is seen off after being transported to liquid storage joint after medium supercharging by external pipeline, the pressure that medium in liquid storage joint acts on spool is greater than spring force, and control valve is closed.When the dry running of helical rotor pump, the pressure drop in liquid storage joint, the pressure acted on spool of the medium in liquid storage joint is less than the elastic force of spring, and spool is opened under spring force effect.Path is formed by the return port on the hole of medium logical on the through hole on spool and singe screw central shaft and singe screw between liquid storage joint and import threeway, medium in liquid storage joint under gravity, import threeway is flowed into by the through hole in singe screw and return port, until the liquid level in liquid storage joint and the level balance in import threeway, the height of this liquid level should higher than stator center line height, when there being liquid in medium, because the normal quantity delivered of helical rotor pump is much larger than return port return flow, liquid storage joint internal pressure raises, control valve is closed, this pump enters normal operating condition, helical rotor pump is made to be in selflubricating state all the time.
Embodiment 3
This helical rotor pump comprises stator, singe screw, import threeway, liquid storage joint, spool, universal joint and spring.The medium inlet end of import threeway one end and singe screw pair seals and removably connects, liquid storage joint is left, right-hand member outer side surface all has flange disc, the outer diameter of left flange disc, thickness is respectively 460mm, 28mm, on left flange disc diameter be 410mm be circumferentially evenly distributed with the round tube hole that 12 diameters are 26mm, the outer diameter of right flange disc, thickness is respectively 840mm, 54mm, on right flange disc diameter be 770mm be circumferentially evenly distributed with the round tube hole that 20 diameters are 36mm, the medium inlet end of liquid storage joint and the media outlet end of singe screw pair seal and removably connect, storage liquid storage joint is zigzag, liquid storage joint upper, the central shaft of hypomere be parallel to each other and on, the central shaft of hypomere is crossing with the central axis in stage casing, a round tube hole is had in liquid storage joint, from the epimere left side of liquid storage joint to the Circularhole diameter 300mm of the intersection in epimere and stage casing, Circularhole diameter in stage casing and hypomere is 600mm, the length of liquid storage joint, highly be respectively 1700mm, 1900mm, singe screw central shaft from the media outlet end of singe screw pair to entry end has the hole of a logical medium, namely the through hole in singe screw, this through hole is by the first circular hole, second circular hole and the 3rd circular hole are formed, the diameter of the first circular hole, length is respectively 200mm, 190mm, the diameter of the second circular hole, length is respectively 100mm, 134mm, second circular hole left end is monolateral cone angle is 45 ° of frustoconic shape, the diameter of the 3rd circular hole, length is respectively 65mm, 1500mm, the return port all simultaneously communicated with the hole on singe screw central shaft and import threeway inner chamber is had at the singe screw end of the medium inlet end of singe screw pair, this return port is decussation round tube hole, the diameter of this round tube hole is 65mm, at the control valve that the hole of singe screw of the media outlet end being positioned at singe screw pair coordinates built with activity, this control valve comprises spool and spring, the first cylinder on spool, second cylinder and the 3rd cylinder are cylinder, the diameter of the first cylinder, length is respectively 198mm, 40mm, the annulus of the first cylinder between the first cylinder and the second cylinder is evenly distributed with four central angles and is 90 ° and inner diameter is 120mm, outer diameter is the ring through hole of 180mm, the diameter of the second cylinder, length is respectively 120mm, 85mm, the right-hand member of the second cylinder is monolateral cone angle is 45 ° of round platforms, the diameter of three cylindrical, length is respectively 80mm, 25mm, stage clip 8 × 90 × 200-2GB2089-1994-II selected by spring
a-Zn.
When helical rotor pump normally works, medium enters pump chamber by import threeway, by the rotary motion of singe screw, is seen off after being transported to liquid storage joint after medium supercharging by external pipeline, the pressure that medium in liquid storage joint acts on spool is greater than spring force, and control valve is closed.When the dry running of helical rotor pump, the pressure drop in liquid storage joint, the pressure acted on spool of the medium in liquid storage joint is less than the elastic force of spring, and spool is opened under spring force effect.Path is formed by the return port on the hole of medium logical on the through hole on spool and singe screw central shaft and singe screw between liquid storage joint and import threeway, medium in liquid storage joint under gravity, import threeway is flowed into by the through hole in singe screw and return port, until the liquid level in liquid storage joint and the level balance in import threeway, the height of this liquid level should higher than stator center line height, when there being liquid in medium, because the normal quantity delivered of helical rotor pump is much larger than return port return flow, liquid storage joint internal pressure raises, control valve is closed, this pump enters normal operating condition, helical rotor pump is made to be in selflubricating state all the time.
Claims (4)
1. a self-lubricating single-screw pump, comprises stator, singe screw, import threeway, spring, universal joint, and the medium inlet end of import threeway one end and singe screw pair seals and removably connects, it is characterized in that the medium inlet end of liquid storage joint and the media outlet end of singe screw pair seal to removably connect, the media outlet end of liquid storage joint is higher than the top of stator, singe screw central shaft from the media outlet end of singe screw pair to entry end has the hole of a logical medium, at the control valve that the hole of singe screw of the media outlet end being positioned at singe screw pair coordinates built with activity, this control valve comprises spool and spring, there is through hole spool one end, the return port all simultaneously communicated with the hole on singe screw central shaft and import threeway inner chamber is had at the singe screw end of the medium inlet end of singe screw pair, when helical rotor pump normally works, medium enters pump chamber by import threeway, by the rotary motion of singe screw, is seen off after being transported to liquid storage joint after medium supercharging by external pipeline, the pressure that medium in liquid storage joint acts on spool is greater than spring force, and control valve is closed, when the dry running of helical rotor pump, the pressure drop in liquid storage joint, the pressure acted on spool of the medium in liquid storage joint is less than the elastic force of spring, and spool is opened under spring force effect, path is formed by the hole on the through hole on spool and singe screw central shaft and the return port on singe screw between liquid storage joint and import threeway, medium in liquid storage joint under gravity, import threeway is flowed into from liquid storage joint, until the liquid level in liquid storage joint and the level balance in import threeway, the height of this liquid level should higher than stator center line height, when there being liquid in medium, because the normal quantity delivered of helical rotor pump is much larger than return port return flow, liquid storage joint internal pressure raises, control valve is closed, pump enters normal operating condition, helical rotor pump is made to be in selflubricating state all the time.
2. self-lubricating single-screw pump according to claim 1, it is characterized in that liquid storage joint is zigzag joint, liquid storage joint upper, the central shaft of hypomere be parallel to each other and on, the central shaft of hypomere is crossing with the central axis in stage casing, a round tube hole is had in liquid storage joint, the Circularhole diameter of the intersection from the epimere left side of liquid storage joint to epimere and stage casing is 100mm, Circularhole diameter in stage casing and hypomere is 200mm, the length of liquid storage joint, highly be respectively 500mm, 600mm, through hole in singe screw is by the first circular hole, second circular hole and the 3rd circular hole are formed, the diameter of the first circular hole, length is respectively 100mm, 80mm, the diameter of the second circular hole, length is 42mm respectively, 62mm, second circular hole left end is monolateral cone angle is 45 ° of frustoconic shape, the diameter of the 3rd circular hole, length is respectively 32mm, 800mm, return port in singe screw is decussation round tube hole, the diameter of this round tube hole is 32mm, on spool, the first cylinder, the second cylinder and the 3rd cylinder are cylinder, diameter, the length of the first cylinder are respectively 98mm, 20mm, the annulus of the first cylinder between the first cylinder and the second cylinder is evenly distributed with four central angles and is 90 ° and inner diameter is the annulus through hole of 65mm, the equal 90mm of outer diameter, diameter, the length of the second cylinder are respectively 65mm, 45mm, the right-hand member of the second cylinder is monolateral cone angle is 45 ° of round platforms, and diameter, the length of three cylindrical are respectively 34mm, 20mm.
3. self-lubricating single-screw pump according to claim 1, it is characterized in that liquid storage joint is zigzag, liquid storage joint upper, the central shaft of hypomere be parallel to each other and on, the central shaft of hypomere is crossing with the central axis in stage casing, a round tube hole is had in liquid storage joint, the Circularhole diameter of the intersection from the epimere left side of liquid storage joint to epimere and stage casing is 200mm, Circularhole diameter in stage casing and hypomere is 400mm, the length of liquid storage joint, highly be respectively 1000mm, 1200mm, through hole in singe screw is by the first circular hole, second circular hole and the 3rd circular hole are formed, the diameter of the first circular hole, length is respectively 150mm, 120mm, the diameter of the second circular hole, length is respectively 55mm, 75mm, the diameter of the 3rd circular hole, length is respectively 40mm, 1100mm, return port in singe screw is decussation round tube hole, the diameter of this round tube hole is 40mm, first cylinder on spool, second cylinder and the 3rd cylinder are cylinder, the diameter of the first cylinder, length is respectively 148mm, 35mm, the central shaft of the first cylinder there is a diameter, length is respectively 50mm, the round tube hole of 73mm, second cylindrical radial has diameter to be the decussation round tube hole of 30mm, round tube hole on the central shaft of the first cylinder communicates with the decussation round tube hole in the second cylinder, the diameter of the second cylinder, length is respectively 70mm, 57mm, the right-hand member of the second cylinder is monolateral cone angle is 45 ° of round platforms, the diameter of three cylindrical, length is respectively 45mm, 15mm.
4. self-lubricating single-screw pump according to claim 1, it is characterized in that liquid storage joint is zigzag, liquid storage joint upper, the central shaft of hypomere be parallel to each other and on, the central shaft of hypomere is crossing with the central axis in stage casing, a round tube hole is had in liquid storage joint, from the epimere left side of liquid storage joint to the Circularhole diameter 300mm of the intersection in epimere and stage casing, Circularhole diameter in stage casing and hypomere is 600mm, the length of liquid storage joint, highly be respectively 1700mm, 1900mm, through hole in singe screw is by the first circular hole, second circular hole and the 3rd circular hole are formed, the diameter of the first circular hole, length is respectively 200mm, 190mm, the diameter of the second circular hole, length is respectively 100mm, 134mm, second circular hole left end is monolateral cone angle is 45 ° of frustoconic shape, the diameter of the 3rd circular hole, length is respectively 65mm, 1500mm, return port in singe screw is decussation round tube hole, the diameter of this round tube hole is 65mm, on spool, the first cylinder, the second cylinder and the 3rd cylinder are cylinder, diameter, the length of the first cylinder are respectively 198mm, 40mm, the annulus of the first cylinder between the first cylinder and the second cylinder is evenly distributed with four central angles and is 90 ° and the annulus through hole that inner diameter is 120mm, outer diameter is 180mm, diameter, the length of the second cylinder are respectively 120mm, 85mm, the right-hand member of the second cylinder is monolateral cone angle is 45 ° of round platforms, and diameter, the length of three cylindrical are respectively 80mm, 25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110462876.4A CN102536794B (en) | 2011-12-31 | 2011-12-31 | Self-lubricating single-screw pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110462876.4A CN102536794B (en) | 2011-12-31 | 2011-12-31 | Self-lubricating single-screw pump |
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| Publication Number | Publication Date |
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| CN102536794A CN102536794A (en) | 2012-07-04 |
| CN102536794B true CN102536794B (en) | 2015-01-14 |
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| CN201110462876.4A Active CN102536794B (en) | 2011-12-31 | 2011-12-31 | Self-lubricating single-screw pump |
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| CN110905800B (en) * | 2019-12-25 | 2021-08-10 | 河北恒盛泵业股份有限公司 | Screw pump with equal wall thickness for pumping oil |
Citations (5)
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|---|---|---|---|---|
| US3286642A (en) * | 1964-08-18 | 1966-11-22 | Flygts Pumpar Ab | Hydraulic balancing device in screw pumps |
| SU1084489A1 (en) * | 1982-07-05 | 1984-04-07 | Предприятие П/Я В-8319 | Helical rotor pump |
| CN1104301A (en) * | 1993-09-07 | 1995-06-28 | 约翰·海因里希·波尔纳曼公司 | Eccentric screw stem pump |
| CN2733047Y (en) * | 2004-04-20 | 2005-10-12 | 张维昌 | Single-screw pump with underslung seal |
| CN2791306Y (en) * | 2005-04-13 | 2006-06-28 | 但维强 | Screw-rod pump with pressure regulation valve |
-
2011
- 2011-12-31 CN CN201110462876.4A patent/CN102536794B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3286642A (en) * | 1964-08-18 | 1966-11-22 | Flygts Pumpar Ab | Hydraulic balancing device in screw pumps |
| SU1084489A1 (en) * | 1982-07-05 | 1984-04-07 | Предприятие П/Я В-8319 | Helical rotor pump |
| CN1104301A (en) * | 1993-09-07 | 1995-06-28 | 约翰·海因里希·波尔纳曼公司 | Eccentric screw stem pump |
| CN2733047Y (en) * | 2004-04-20 | 2005-10-12 | 张维昌 | Single-screw pump with underslung seal |
| CN2791306Y (en) * | 2005-04-13 | 2006-06-28 | 但维强 | Screw-rod pump with pressure regulation valve |
Non-Patent Citations (1)
| Title |
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| 螺杆泵安全阀设置的探讨;李福天;《机电设备》;19940615(第3期);第8-10页 * |
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