CN1107184C - Flow control valve of feedback regulation pressure-difference hydraulic machine - Google Patents
Flow control valve of feedback regulation pressure-difference hydraulic machine Download PDFInfo
- Publication number
- CN1107184C CN1107184C CN99121723A CN99121723A CN1107184C CN 1107184 C CN1107184 C CN 1107184C CN 99121723 A CN99121723 A CN 99121723A CN 99121723 A CN99121723 A CN 99121723A CN 1107184 C CN1107184 C CN 1107184C
- Authority
- CN
- China
- Prior art keywords
- pressure
- hydraulic press
- water
- control piece
- elastic element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
- Control Of Water Turbines (AREA)
Abstract
The present invention relates to a control valve for the flow rate of a feedback pressure difference regulating type hydraulic press. In order to provide a flow rate control device having the advantages of low equipment cost, convenient operation and repair, and good service performance, the present invention is proposed. The control valve for the flow rate of a feedback pressure difference regulating type hydraulic press comprises a body, a control piece, an elastic element and an adjusting element, wherein the center of the upper part of the body is provided with a casing pipe for forming a cylindrical hollow chamber, and both sides of the lower part of the body are provided with an inlet and an outlet which are communicate with the hollow chamber and a flow passage. The control piece is arranged in the hollow chamber of the body in a sliding mode, and the top surface of the control piece is lower than an interface. The elastic element is arranged between the top surface of the control piece and the inner top surface of the hollow chamber. The elastic adjusting element is a sliding cover which is sheathed on the casing pipe of the body.
Description
Technical field
The invention belongs to the control valve of water supply system auxiliary device, particularly a kind of feedback regulating pressure difference type hydrualic press flow rate.
Background technique
Now in the water system that building adopted, for fear of tap water pipe line hypotony or too high, thereby produce the situation that current are intermittent or current spray suddenly rapidly when causing water discharge of water faucet, more than installing on the supply channel in order to stablize the hydraulic press of hydraulic pressure, the hydraulic pressure of keeping supply channel by hydraulic press keeps within the specific limits greatly.
Commonly use in order to the hydraulic press of control hydraulic pressure according to the difference of its control mode, can be divided into haply with the constant voltage hydraulic press of the variable-frequency type motor of frequency variator collocation and with pressure switch control hydraulic press and start the pressure-difference hydraulic machine that stops.
Pressure-difference hydraulic machine comprises hydraulic press, is arranged on the pressure switch and the storage pressure cylinder of hydraulic press export pipeline.By the hydraulic pressure of pressure switch sensing export pipeline, but and setting pressure scope.Prescribe a time limit when user's water makes supply channel pressure be reduced to the following of this pressure switch setting pressure scope, control this hydraulic press by pressure switch and start, to replenish the hydraulic pressure of supply channel; And after water pipe pressure rises, control this hydraulic press by pressure switch to shut down, so that the hydraulic pressure of supply channel can not continue to rise.Storage pressure cylinder system is used for when hydraulic press starts, and stores hydraulic pressure; And after hydraulic press shut down, the pressure that stores by the storage pressure cylinder replenished the water yield that supply channel runs off, so that after hydraulic press shut down, it is too fast that the pressure of supply channel can not descend, to reduce the frequency that hydraulic press starts.
Variable-frequency type constant voltage hydraulic press comprises the pressure-sensing switch and the frequency variator of the variable variable-frequency type motor of hydraulic press, rotating speed, detecting supply channel pressure.By the hydraulic pressure size that frequency variator measures according to the pressure-sensing switch, the lifting of control hydraulic press motor speed is to keep the supply channel stable water pressure.
The pressure-difference hydraulic machine of commonly using is compared with the variable-frequency type hydraulic press, because the motor speed of pressure-difference hydraulic machine is for immobilizing, system utilizes starting or stoping of pressure switch control hydraulic press motor to regulate hydraulic pressure merely, therefore, if the water-outlet quantity of hydraulic press is during greater than the water demand amount of supply channel, will make that the rate of pressure rise of supply channel is too fast, after hydraulic press starts, just shut down at once, the frequency that causes hydraulic press to start, stop is too frequent, not only cause hydraulic press power consumption excessive, but also can have a strong impact on the working life of hydraulic press.
Simultaneously, when the water-outlet quantity of hydraulic press during greater than water consumption, the current that hydraulic press is sent are blocked in the outlet of hydraulic press, and the hydraulic press outlet pressure is risen, and my load rises significantly when making the hydraulic pressure running, and power consumption heightens when making motor rotation.
Therefore, the water flow that the ideal design of pressure-difference hydraulic machine should be hydraulic press is equal to the water-outlet quantity of supply channel, so that after the hydraulic press startup, the pressure of supply channel can rise lentamente, hydraulic press starts to avoid, stop frequency too frequently reaches the excessive situation of power consumption.
But because the motor speed of pressure-difference hydraulic machine is fixed, its water-outlet quantity can't be changed, and the water consumption of general mansion can have great difference along with the difference of time.Therefore the water system artificer just must adopt the hydraulic press of big water-outlet quantity in order to satisfy the water consumption of peak hour.But like this one is, when the slack hours water consumption reduced, the water-outlet quantity of hydraulic press just can far surpass user's water consumption, does not therefore have and can cause the hydraulic press running to waste energy with avoiding, and have influence on the shortcoming of hydraulic press electrical machinery life, and make the water pressure transient.
And frequency-changing pressure stabilizing formula hydraulic press owing to adopt the variable-frequency type motor of speed variable, therefore, can reduce rotating speed of motor in water consumption hour; When water consumption is big, improve motor speed.So that the water-outlet quantity of hydraulic press can adjust along with the water consumption of supply channel size, thereby can avoid the hydraulic press electric motor starting to stop too frequent shortcoming.
But this frequency-changing pressure stabilizing formula hydraulic press of commonly using, owing to must use complex structure, expensive variable-frequency type motor and frequency variator, and need the professional workforce to safeguard, therefore, though frequency-changing pressure stabilizing formula hydraulic press has comparatively favorable effects, the cost of its equipment cost and operation and maintenance is much larger than pressure-difference hydraulic machine, and its cost is far from general small user and can bears, therefore, have only large-scale user just can select to use constant pressure frequency conversion formula hydraulic press now.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, equipment cost is low, operation and maintenance is convenient, usability is good, save the energy and prolong the control valve of the feedback regulating pressure difference type hydrualic press flow rate in hydraulic press working life.
The present invention includes body, control piece, elastic element and be connected in the adjustment element of elastic element; The body center upper portion is for constituting the sleeve pipe of cylindric empty chamber, and both sides, body bottom are provided with inlet and the outlet that is communicated with by the runner that is communicated with empty chamber; It is indoor that the control piece slip is arranged at the body sky, and make its end face be lower than the height of interface, and elastic element is arranged between control piece end face and the empty indoor top surface; Adjusting the flexible adjustment element of elastic element is that flip sleeve is located at the slide lid on the body sleeve.
Wherein:
Body sleeve is provided with annular groove outward; For the adjustment element of slide lid is provided with interface, and extend hook down, adjust the element bottom and establish several axial elasticity groovings, and in the bottom, week be provided with the trip that engages with the body sleeve annular groove in the interface top.
The present invention also comprises fixed element; For the adjustment element bottom periphery of slide lid is provided with outside thread; Fixed element is provided with and adjusts the element external thread spiro fastening to tighten the internal thread of adjusting the element bottom.
Owing to the present invention includes body, control piece, elastic element and be connected in the adjustment element of elastic element; The body center upper portion is for constituting the sleeve pipe of cylindric empty chamber, and both sides, body bottom are provided with inlet and the outlet that is communicated with by the runner that is communicated with empty chamber; It is indoor that the control piece slip is arranged at the body sky, and make its end face be lower than the height of interface, and elastic element is arranged between control piece end face and the empty indoor top surface; Adjusting the flexible adjustment element of elastic element is that flip sleeve is located at the slide lid on the body sleeve.
During assembling, when the present invention is used for comprising the pressure-difference hydraulic machine of motor, water pump, intake pipe, supply channel, storage pressure cylinder, pressure switch and check valve.The present invention is arranged on the intake pipe of water pump, so that current flow through after the present invention, flows into the inlet of this water pump again.During operation, the present invention can be controlled by hydraulic press pump outlet variation in pressure, and changes the flow by current along with the variation in pressure of supply channel, uses the inflow and the water-outlet quantity that make water pump and can adjust along with the water consumption of supply channel.When the water consumption of supply channel made supply channel pressure descend greatly, flow of the present invention was to strengthen, and the inflow of water pump is increased; When water consumption after a little while, flow of the present invention system can reduce, and makes the inflow of water pump reduce, and therefore makes the water-outlet quantity of water pump also along with minimizing; When the present invention and different size and lift hydraulic press are used and when needing to adjust the elasticity coefficient of elastic element, make adjust element along body sleeve make progress (or downwards) move, transfer the length of long (or transferring short) elastic element, to increase the elasticity coefficient of (or reducing) elastic element, when the elasticity coefficient of elastic element is adjusted to desirable value, element will be adjusted and elastic element is fixed in setting, not only simple in structure, equipment cost is low, operation and maintenance is convenient, and usability is good, save the energy and prolong hydraulic press working life, thereby reach purpose of the present invention.
Description of drawings
Fig. 1, for structural representation sectional view of the present invention.
Fig. 2, move schematic representation for the present invention.
Fig. 3, be among Fig. 2 A to view.
Fig. 4, for being assembled with pressure-difference hydraulic machine structural representation of the present invention.
Adjust element among Fig. 5, the present invention and adjust elastic element elasticity coefficient action schematic representation.
Embodiment
As shown in Figure 4, the present invention 30 is used for comprising the pressure-difference hydraulic machine 10 of motor 11, water pump 12, intake pipe 13, supply channel 14, storage pressure cylinder 20, pressure switch 21 and check valve 60.Water pump 12 is driven by motor 11, and the water intake of water pump 12 and water outlet are connected with intake pipe 13 and supply channel 14 respectively.
Pressure is opened 21 and is closed and to be arranged on the supply channel 14, by the hydraulic pressure of pressure switch 21 sensing supply channels 14, and control these hydraulic press 10 motors 11 start and stop.
The present invention 30 is arranged on the intake pipe 13 of water pump 12, so that current flow through after the present invention 30, flows into the inlet of this water pump 12 again.As shown in Figure 4, the present invention 30 has the connecting tube 50 that is connected with connection mouth seat 37, and the other end of connecting tube 50 is provided with the pressure export 22 that is communicated with supply channel 14, therefore makes the hydraulic pressure of supply channel 14 can be directed among the present invention 30.
The present invention 30 major technique feature ties up in controlled by hydraulic press 10 water pumps 12 outlet end variation in pressure, and change flow by current along with the variation in pressure of supply channel 14, use the inflow and the water-outlet quantity that make water pump 12 and can adjust along with the water consumption of supply channel 14.When the water consumption of supply channel 14 made supply channel 14 pressure descend greatly, the present invention 30 flow system can strengthen, and the inflow of water pump 12 is increased; When water consumption after a little while, flow of the present invention is to reduce, and make the inflow of water pump 12 reduce, therefore make the water-outlet quantity of water pump 12 also along with minimizing, and the hydraulic pressure that pressure switch 21 senses also can gently rise, make motor 11 start the stable action that stops, to avoid the frequent situation of motor 11 startings.
As shown in Figure 1, the present invention 30 comprises body 31, control piece 40, is the elastic element 42 of extension spring, adjustment element 70, fixed element 80, cock body 45 and connection mouth seat 37.
The empty chamber of control piece 40 peripheries and body 31 32 is corresponding, and its periphery is arranged with at least one seal ring 41, and control piece 40 central authorities are provided with through hole 44.As shown in Figure 3, control piece 40 bottoms are provided with some grooves 47.
Adjust the elasticity coefficient that element 70 is used to adjust elastic element 42, it is for being contained in body 31 sleeve pipes 33 slide lid outward by upper and lower flip sleeve, which is provided with interface 71, and extend hook 43 down in interface 71 tops, adjust element 70 bottoms and establish several axial elasticity groovings 72, and be respectively equipped with trip 73 and the outside thread 74 that engages with body 31 sleeve pipes 33 annular grooves 331 in the bottom internal and external circumferential.
Fixed element 80 is provided with and adjusts the internal thread 81 that element 70 bottom outside threads 74 screw togather.
As shown in Figure 2, after the pressure of supply channel 14 enters sky chamber 32, can promote control piece 40 moves towards the below, by between control piece 40 and empty chamber 32 inner top surfaces, being the elastic element 42 of extension spring, control piece 40 is produced the elastic acting force opposite with the hydraulic pressure direction, and 40 generations of drive control piece are born the opposite displacement of hydraulic pressure direction with it.Therefore, when the hydraulic pressure of supply channel 14 when being the tensile-elasticity of elastic element 42 of extension spring, just can make control piece 40 under water pressure pushing, produce downward displacement, and when the hydraulic pressure of supply channel 14 descended, control piece 40 moved up under for the elastic element 42 tensile-elasticity effects of extension spring.
As shown in Figure 1 and Figure 2, control piece 40 bears supply channel 14 interior hydraulic pressure alternately and is the effect of elastic element 42 tensile-elasticities of extension spring, and in body empty chambers 32 31, make upper and lower shift reciprocately, and its bottom is that 34,35 runner 39 is gone into, exported in extended connection, and makes runner 39 be subjected to covering in various degree.As shown in Figure 2, when the pressure of supply channel 14 increased, control piece 40 was subjected to the promotion of hydraulic pressure, stretch in the runner 39, and the reduced cross-sectional area that current are passed through, and the inflow of water pump 12 is reduced.Simultaneously, as shown in Figure 1, when the pressure of supply channel 14 hour, be the tensile-elasticity of the elastic element 42 of the extension spring pressure greater than supply channel 14, control piece 40 moves up under the elastic element 42 tensile-elasticity effects that are extension spring, reduce the degree that runner 39 controlled products 40 cover, therefore, the sectional area that current are passed through strengthens, and the inflow of water pump 12 is increased.And by the positioning ring 321 restriction control pieces 40 of body empty chambers 31 32 inner circle walls upwards mobile extreme higher position in empty chamber 32 in.
As shown in Figure 3, the some grooves 47 that are provided with by control piece 40 bottoms when control piece 40 contact with body 31 inner bottom parts, still can have small amount of water 34 to flow to through groove 47 and to export 35 from entering the mouth, and cause cavitation corrosion because of suction less than water to prevent water pump 12.
As shown in Figure 4, by the check valve 60 on the inlet 34 side intake pipes 13 that are arranged at the present invention 30, prevent current adverse current in supply channel 14 and the present invention 30.
Whether the present invention 30 can reach the main key of effective control of pump 12 inflows and the mutual balanced effect of supply channel 14 water consumptions, tie up in whether can suitably cooperating with the pressure of storage pressure cylinder 20 and supply channel 14 in order to the elastic force size that promotes control piece 40 for the elastic element 42 of extension spring, and make under various different water consumption states, control piece 40 all can produce suitable displacement amount in body empty chambers 32 31, move to suitable height and position, regulate to be communicated with body 31 inlets 34 and to export the open area of 35 runner 39, so that the water consumption on the inflow of water pump 12 and the supply channel 14 cooperatively interacts.And because of the hydraulic press lift difference of all size, so pressure and flow status during its running are neither identical, therefore, the present invention 30 is provided with an adjustment element 70 in order to elastic element 42 elasticity coefficient that are adjusted into extension spring, so that the present invention 30 can cooperate the hydraulic press of all size and different lifts to use.
As shown in Figure 1, when control piece 40 is promoted by hydraulic pressure,, the elastic element 42 of extension spring saves elastic force downwards for being stretched.And as shown in Figure 5, when the present invention 30 is used with different size and lift hydraulic press and when needing to adjust the elasticity coefficient of elastic element 42, unscrew spiral shell and be contained in the fixed element 80 of adjusting element 70 bottoms, by adjusting element 70 bottom elasticity groovings 72, make the elasticity expansion outwardly of its bottom, all trips 73 break away from body 31 sleeve pipes 33 annular grooves 331 in it, just can make into the adjustment element 70 of slide lid along body 31 sleeve pipes 33 upwards (or downwards) move, transfer long (or transferring short) upper end to be connected in to adjust that element 70 interfaces 71 tops extend goes up the length for the elastic element 42 of extension spring on the hook 43 down, to increase (or reducing) is the elasticity coefficient of the elastic element 42 of extension spring, when the elasticity coefficient of elastic element 42 is adjusted to desirable value, be loaded on the outside thread 74 of adjusting element 70 bottoms with fixed element 80 spiral shells, by the elasticity grooving 72 of adjusting element 42 bottoms, tighten and adjust element 70 bottoms, its interior all trip 73 is sticked on the annular groove 331 of body 31 sleeve pipes 33 peripheries, to adjust element 70 and elastic element 42 is fixed in setting, to be adapted to the various lifts of hydraulic press, the setting of pressure.
The present invention 30 is by above elements combination, is can be by the size of the present invention's 30 control of pump 12 inflows, and the water displacement of water pump 12 can be cooperatively interacted with the water consumption of supply channel 14.Its major advantage is as follows:
1, when water consumption little, or hydraulic press 10 water-outlet quantitys are during greater than water consumption, reduce the inflow of water pump 12 by the present invention's 30 controls, so that the water-outlet quantity of water pump 12 and water consumption adapt, the hydraulic pressure of supply channel 14 can not risen rapidly, and therefore, hydraulic press 10 can keep the steady running state, reduce the frequency that hydraulic press 10 starts, stops, reaching the saving energy, prolong the hydraulic press effect in 10 working lifes.Otherwise when water consumption is big, or hydraulic press 10 water-outlet quantitys are during less than water consumption, and 30 inflows that can increase water pump 12 of the present invention improve the water-outlet quantity of water pump 12, to keep the stable water pressure of supply channel 14.
2, when water consumption hour, the inflow and the water-outlet quantity of water pump 12 reduce thereupon, therefore make water pump 12 can maintain low load condition running, and the outlet end hydraulic pressure of water pump 12 can not rise and increase the burden of water pump 12, therefore can save the energy effectively.
3, by the present invention 30 technological means, system can be so that pressure-difference hydraulic machine 10 also can reach the effect that approaches frequency-changing pressure stabilizing formula hydraulic press, therefore, can replace expensive frequency-changing pressure stabilizing formula hydraulic press with the comparatively cheap pressure-difference hydraulic machine of cost, can save the equipment and the maintenance cost of water system significantly.Therefore, no matter in water spike or ebb period, the present invention 30 all can be controlled at the water-outlet quantity of hydraulic press 10 water pumps 12 state with the water consumption balance of supply channel 14, avoid hydraulic press 10 water-outlet quantitys to surpass the water consumption of supply channel 14, the pressure of supply channel 14 rises too fast to cause hydraulic press 10 to start afterwards, and make the situation that water pump 12 starts, stop frequency is too fast take place, save the energy, prolong the hydraulic press purpose in 10 working lifes so can effectively reach.
Claims (3)
1, a kind of control valve of feedback regulating pressure difference type hydrualic press flow rate, it comprises body, control piece, elastic element and connection and adjusts the flexible adjustment element of elastic element; The body center upper portion is for constituting the sleeve pipe of cylindric empty chamber, and both sides, body bottom are provided with inlet and the outlet that is communicated with by the runner that is communicated with empty chamber; It is indoor that the control piece slip is arranged at the body sky, and make its end face be lower than the height of interface, and elastic element is arranged between control piece end face and the empty indoor top surface; It is characterized in that the flexible adjustment element of described adjustment elastic element is that flip sleeve is located at the slide lid on the body sleeve.
2, the control valve of feedback regulating pressure difference type hydrualic press flow rate according to claim 1 is characterized in that described body sleeve is provided with annular groove outward; For the adjustment element of slide lid is provided with interface, and extend hook down, adjust the element bottom and establish several axial elasticity groovings, and in the bottom, week be provided with the trip that engages with the body sleeve annular groove in the interface top.
3, the control valve of feedback regulating pressure difference type hydrualic press flow rate according to claim 1 and 2 is characterized in that being screwed with fixed element outside described adjustment element; For the adjustment element bottom periphery of slide lid is provided with outside thread; Fixed element is provided with and adjusts the element external thread spiro fastening to tighten the internal thread of adjusting the element bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99121723A CN1107184C (en) | 1999-10-08 | 1999-10-08 | Flow control valve of feedback regulation pressure-difference hydraulic machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99121723A CN1107184C (en) | 1999-10-08 | 1999-10-08 | Flow control valve of feedback regulation pressure-difference hydraulic machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1292470A CN1292470A (en) | 2001-04-25 |
| CN1107184C true CN1107184C (en) | 2003-04-30 |
Family
ID=5282105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99121723A Expired - Fee Related CN1107184C (en) | 1999-10-08 | 1999-10-08 | Flow control valve of feedback regulation pressure-difference hydraulic machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1107184C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7121522B2 (en) * | 2004-01-30 | 2006-10-17 | Perez Sergio | Device for the regulation of flow applied to flow valves working under pressure differential |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0452496A1 (en) * | 1989-09-30 | 1991-10-23 | Asahi Yukizai Kogyo Co., Ltd | Constant flow rate valve |
| US5105850A (en) * | 1991-07-22 | 1992-04-21 | Harris David M | Fluid fuse valve |
| JPH08226558A (en) * | 1994-12-22 | 1996-09-03 | Matsushita Electric Works Ltd | Constant flow valve device |
-
1999
- 1999-10-08 CN CN99121723A patent/CN1107184C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0452496A1 (en) * | 1989-09-30 | 1991-10-23 | Asahi Yukizai Kogyo Co., Ltd | Constant flow rate valve |
| US5105850A (en) * | 1991-07-22 | 1992-04-21 | Harris David M | Fluid fuse valve |
| JPH08226558A (en) * | 1994-12-22 | 1996-09-03 | Matsushita Electric Works Ltd | Constant flow valve device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1292470A (en) | 2001-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2479673C (en) | Water-powered sump pump | |
| CN1107184C (en) | Flow control valve of feedback regulation pressure-difference hydraulic machine | |
| CN201723421U (en) | Piezoelectric pump for self-adapting active valve | |
| CN1108474C (en) | Flow control valve of feedback regulation pressure-difference hydraulic machine | |
| CN1083957C (en) | Feedback regulating pressure difference type hydrualic press flow rate controlling valve | |
| CN106015122A (en) | High-efficiency hydraulic ram | |
| CN205383097U (en) | Blower fan wheel hub along with full automatically regulated paddle angle of changes in ambient temperature | |
| CN2192780Y (en) | Extension tube check valve | |
| CN1405471A (en) | Hydropress flow regulating and controlling valve | |
| CN1219951C (en) | Hydraulic press flow adjusting device | |
| CN1270959C (en) | Energy-saving elevator hydraulic system employing closed oil way | |
| CN202326288U (en) | Variable frequency speed-increasing deep well submersible pump | |
| CN2503120Y (en) | Flow balance device of hydropress | |
| CN2625607Y (en) | Pressure and speed regulating inside engaged gear pump | |
| SU1035281A1 (en) | Hydraulic drive for set of sucker-rod well pumps | |
| CN1396396A (en) | Flow regulator of hydraulic press | |
| CN2597795Y (en) | Dual-purpose general water valve for depressing and stabilizing pressure, and opening and closing | |
| KR200209014Y1 (en) | Variable connecting rod | |
| CN217327585U (en) | Hydraulic gas compressor | |
| CN216789843U (en) | Novel wall-mounted oil pump with two-stage oil pumping and displacement regulation | |
| CN2471966Y (en) | Hydraulic compensated sandproof oil sucking pump | |
| CN216867026U (en) | Water pump structure | |
| CN213017805U (en) | Overflow valve | |
| CN2743633Y (en) | Respiration valve | |
| CN2249321Y (en) | Energy-saving double-function deep-well oil-well pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |