CN113175422A - Novel hydraulic metering pump and measuring method thereof - Google Patents
Novel hydraulic metering pump and measuring method thereof Download PDFInfo
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- CN113175422A CN113175422A CN202110492007.XA CN202110492007A CN113175422A CN 113175422 A CN113175422 A CN 113175422A CN 202110492007 A CN202110492007 A CN 202110492007A CN 113175422 A CN113175422 A CN 113175422A
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- cavity
- metering
- plunger
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- photoelectric sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
- F04B9/105—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor
- F04B9/1056—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor with fluid-actuated inlet or outlet valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention discloses a novel hydraulic metering pump which comprises a pump body, wherein an inner cavity of the pump body is divided into an upper cavity and a lower cavity by a partition plate, the upper cavity is in sliding seal fit with an upper cavity plunger, the upper cavity is divided into a metering cavity and an upper pressure cavity by the upper cavity plunger, the lower cavity is in sliding seal fit with a lower cavity plunger, the partition plate and the inner wall of the lower cavity form a lower pressure cavity, the lower cavity plunger is connected with the upper cavity plunger by a connecting rod, and the connecting rod is in sliding seal fit with the inner hole wall of the partition plate by a connecting rod sealing ring. The plunger of the upper cavity is pushed to slide by introducing hydraulic pressure and the like, so that the internal volume of the cavity of the metering cavity is reduced, and liquid in the cavity is discharged; the metering hole is a pulse signal once through the metering photoelectric sensor, and the total liquid volume discharged from the pump body can be calculated by detecting the pulse signal and according to the liquid volume discharged from the pump body in the time interval between the received pulse signals, so that accurate metering is completed.
Description
Technical Field
The invention relates to the technical field of metering pumps, in particular to a novel hydraulic metering pump.
Background
The metering pump is also called a quantitative pump or a proportional pump, and is a special volumetric pump which can meet the requirements of various strict process flows, can realize stepless regulation of flow within the range of | 0-100% and is used for conveying liquid. Is a fluid conveying machine, and is characterized by that it can retain a constant flow rate regardless of discharge pressure. The metering pump can simultaneously complete the functions of conveying, metering and adjusting, thereby simplifying the production process flow, and is widely applied to various industrial fields of chemical industry, pharmacy, food and the like nowadays due to the outstanding characteristics of the metering pump.
In the prior art, a metering pump generally adopts a diaphragm type or plunger type structure and the like, and the diaphragm type metering pump is difficult to achieve high accuracy because a diaphragm deforms to a certain degree during action and the deformation is different for liquids with different viscosities; although the conventional plunger metering pump can achieve higher accuracy, it has some disadvantages to limit its application: firstly, the friction loss between the plunger and the cylinder wall can cause the air tightness to be reduced, so that the liquid suction amount is insufficient, and the metering precision is influenced; secondly, the structure is complex, parts are more and are difficult to be manufactured by all corrosion-resistant raw materials, so that the long-term durability of the structure cannot be ensured; thirdly, the manufacturing cost is high, which limits the popularization.
When the metering pump is used for metering corrosive liquid, the metering pump has higher requirements on the corrosion resistance of the metering pump, and the metering pump is required to have simple and reliable structure and stable performance while keeping higher metering precision.
Disclosure of Invention
The invention aims to provide a novel hydraulic metering pump to solve the problem that the metering pump provided in the background technology is used for high-precision metering of corrosive liquid.
In order to achieve the purpose, the invention provides the following technical scheme: including the pump body, the pump body will through the baffle that sets up pump body inner chamber falls into epicoele and cavity of resorption, epicoele sliding seal cooperation epicoele plunger, the epicoele plunger falls into the epicoele and measures chamber and last pressure chamber, cavity of resorption sliding seal cooperation cavity of resorption plunger, the cavity of resorption plunger the baffle with cavity of resorption inner wall forms down the pressure chamber, cavity of resorption plunger through the connecting rod that sets up with epicoele plunger is connected, the connecting rod passes through connecting rod sealing washer and the cooperation of baffle inner hole wall sliding seal, go up pressure chamber fixed connection epicoele pressurization solenoid valve and epicoele pressure release solenoid valve, pressure chamber fixed connection cavity of resorption pressurization solenoid valve and cavity of resorption pressure release solenoid valve down, measurement chamber fixed connection feed valve and bleeder valve and level sensor.
As a preferred technical scheme of the present invention, the lower cavity plunger is fixedly connected to a light barrier, and the light barrier passes through the bottom of the pump body.
As a preferred technical scheme of the invention, the light barrier is a solid light-tight plate, one side of the light barrier is provided with a light-transmitting limiting hole, and the other side of the light barrier is provided with a plurality of light-transmitting metering holes which are uniformly arranged.
As a preferred technical scheme of the invention, the bottom of the pump body is provided with a limit photoelectric sensor matched with a limit hole of the light barrier and a metering photoelectric sensor matched with a metering hole, both the limit photoelectric sensor and the metering photoelectric sensor are composed of a light emitter and a light receiver, and the light barrier is positioned between the light emitter and the light receiver.
As a preferred technical scheme of the invention, a liquid level sensor is arranged in the metering cavity, the liquid level sensor, the feed valve and the discharge valve are all arranged at the top of the pump body, the liquid level sensor detects the position of liquid to be measured in the metering cavity, and when the position of the liquid level to be measured is detected to be lower than a set height, the pulse number of the photoelectric sensor is stopped being recorded.
As a preferable technical solution of the present invention, the metering chamber, the upper pressure chamber, and the lower pressure chamber are all provided as closed inner chambers.
As a preferable technical scheme of the invention, the feeding valve and the discharging valve are both set to be one-way valves.
As a preferred technical scheme of the invention, a connecting rod sealing ring and a gland are arranged between the connecting rod and the inner wall of the partition plate.
As a preferable technical scheme of the invention, the method comprises the following steps:
firstly, when a controller is powered on, a limiting photoelectric sensor enables a light receiver of the limiting photoelectric sensor to be in a state of not receiving light signals due to the fact that a solid part of a light barrier is shielded, at the moment, the controller controls a lower cavity pressurization electromagnetic valve and an upper cavity pressure relief electromagnetic valve to be opened, pressure liquid serving as a power source is led into a lower pressure cavity through the lower cavity pressurization electromagnetic valve, and liquid in an upper pressure cavity can flow out through the upper cavity pressure relief electromagnetic valve; the lower cavity plunger moves downwards under the pushing of pressure to drive the light barrier to move in the same direction until a light-transmitting limiting hole in the light barrier reaches a position corresponding to the limiting photoelectric sensor, and the controller closes the lower cavity pressurizing electromagnetic valve and the upper cavity pressure relief electromagnetic valve after detecting that a light receiver of the limiting photoelectric sensor receives a light signal, which is called a material sucking step;
secondly, the controller controls the upper cavity pressurization solenoid valve and the lower cavity pressure relief solenoid valve to be opened, pressure liquid serving as a power source is introduced into the upper pressure cavity through the upper cavity pressurization solenoid valve, and liquid in the lower pressure cavity can flow out through the lower cavity pressure relief solenoid valve; the upper cavity plunger drives the connecting rod, the lower cavity plunger and the light barrier to move upwards together under the pushing of pressure, and the controller detects the output signal of the liquid level sensor at the moment until the signal that the liquid level sensor outputs the liquid level is detected, which is called as an exhaust step;
thirdly, at the moment, the metering hole on the light barrier continuously passes through the metering photoelectric sensor, the light receiver of the metering photoelectric sensor continuously sends out pulse signals along with the metering photoelectric sensor, and the controller detects and records the pulse number output by the light receiver of the metering photoelectric sensor, which is called as a measuring step;
and fourthly, calculating the amount of the liquid to be measured discharged out of the pump body by the controller according to the received pulse number, the distance between the metering holes and the sectional area of the metering cavity, and the calculation is called as a calculation step.
Compared with the prior art, the invention has the beneficial effects that:
1. the metering cavity has a simple structure, and can ensure the reliability and durability of metering for liquid to be metered, especially corrosive liquid.
2. The plunger type combined photoelectric metering method has high accuracy and strong interference resistance, and the resolution and the accuracy of metering can be effectively improved only by shortening the distance between the metering holes.
3. The use of hydraulic pressure, particularly water pressure, as a power source is easier to obtain than driving means such as electric driving.
4. Compared with the traditional plunger metering pump, the pump body driving part is filled with liquid, so that the problem of air tightness reduction of the plunger in long-term application can be solved.
Drawings
FIG. 1 is a schematic diagram of the hydraulic metering pump of the present invention;
FIG. 2 is a front view of the photosensor and light barrier viewed along the direction of arrow A in FIG. 1;
fig. 3 is a front view of a light barrier.
FIG. 4 is a flow chart of a method of measurement of the hydraulic metering pump of the present invention;
fig. 5 is a flowchart of a measuring method of the hydraulic metering pump according to an embodiment of the present invention.
The notation in the figure is: 1. a feed valve; 2. a discharge valve; 3. a liquid level sensor; 4. a pump body; 5. a metering chamber; 6. an upper cavity plunger; 7. an upper pressure chamber; 8. a partition plate; 9. a connecting rod sealing ring; 10. a connecting rod; 11. a gland; 12. a lower pressure chamber; 13. a lower cavity plunger; 14. a light barrier; 15. a limit photoelectric sensor; 151. a limiting photoelectric sensor light emitter; 152. a limiting photoelectric sensor optical receiver; 16. a measurement photosensor; 161. a metering photosensor light emitter; 162. a measurement photosensor light receiver; 17. a lower cavity pressurization solenoid valve; 18. the lower cavity pressure relief electromagnetic valve; 19. an upper cavity pressurization electromagnetic valve; 20. an upper cavity pressure relief electromagnetic valve; 21. a limiting hole; 22. a metering orifice;
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution of a novel hydraulic metering pump:
according to the figure 1, the device comprises a pump body 4, the pump body 4 divides the inner cavity of the pump body 4 into an upper cavity and a lower cavity through a partition plate 8, the inner surface of the upper cavity is cylindrical and is in sliding sealing fit with an upper cavity plunger 6, the upper cavity plunger 6 divides the upper cavity into a metering cavity 5 and an upper pressure cavity 7, the inner surface of the lower cavity is cylindrical and is in sliding sealing fit with a lower cavity plunger 13, the lower cavity plunger 13 and the partition plate 8 form a lower pressure cavity 12 with the inner wall of the lower cavity, the lower cavity plunger 13 is connected with the upper cavity plunger 6 through a connecting rod 10, the connecting rod 10 is in sliding sealing fit with the inner wall of the partition plate 8 through a connecting rod sealing ring 9, the lower pressure cavity 12 is fixedly connected with a lower cavity pressurizing solenoid valve 17 and a lower cavity pressure relieving solenoid valve 18, the upper pressure cavity 7 is fixedly connected with an upper cavity pressurizing solenoid, the volume in the metering cavity 5 is reduced, so that liquid in the cavity is discharged, or the lower cavity plunger 13 is pushed to slide downwards by introducing hydraulic pressure and the like, and the upper cavity plunger 6 is driven to move in the same direction by the connecting rod 10, so that the volume in the metering cavity 5 is increased to cause vacuum, so that liquid is sucked; the metering hole 22 is a pulse signal at a time by the metering photoelectric sensor 16, and the total amount of liquid discharged from the pump body 4 can be calculated by detecting the pulse signal and according to the amount of liquid discharged from the pump body at the time interval between the pulse signals, so that accurate metering is completed.
The lower cavity plunger 13 is fixedly connected with a light-tight light barrier 14, the light barrier 14 penetrates through the bottom of the pump body 4, a light-tight limiting hole 21 is formed in one side of the light barrier 14, and a plurality of light-tight metering holes 22 which are uniformly arranged are formed in the other side of the light barrier 14, as shown in fig. 3.
The bottom of the pump body 4 is provided with a limiting photoelectric sensor 15 matched with a limiting hole 21 of the light barrier 14 and a metering photoelectric sensor 16 matched with a metering hole 22, the limiting photoelectric sensor 15 and the metering photoelectric sensor 16 are both composed of a light emitter and a light receiver, and the light barrier 14 is positioned between the light emitter and the light receiver of the limiting photoelectric sensor 15 and the metering photoelectric sensor 16.
Metering cavity 5 is equipped with level sensor 3, charge valve 1 and bleeder valve 2 all set up at the 4 tops of the pump body, level sensor 3 detects the liquid position in metering cavity 5, stop to record the pulse quantity that measurement photoelectric sensor 16 sent when level sensor 3 does not export the liquid level arrival signal, metering cavity 5, go up pressure chamber 7, lower pressure chamber 12 all sets up to sealed inner chamber, charge valve 1 and bleeder valve 2 all set up to the check valve, wherein the flow direction in the charge valve 1 is in the pump body outside the pump body, the flow direction in the charge valve 2 is outside the pump body inside the pump body, be provided with connecting rod sealing washer 9 and gland 11 between connecting rod 10 and the 8 inner walls of baffle, guarantee the leakproofness of connecting rod 10 and epicoele and cavity of resorption junction.
A measuring method of a novel hydraulic metering pump comprises the following steps:
firstly, when the controller is powered on, the limit photoelectric sensor 15 is in a state that the light receiver 152 is not receiving the light signal emitted by the light emitter 151 due to the shielding of the lightproof solid part of the light barrier 14, at this time, the controller controls the lower cavity pressurization solenoid valve 17 and the upper cavity pressure relief solenoid valve 20 to be opened, the lower cavity plunger 13 moves downwards under the pushing of the liquid pressure to drive the light barrier 14 to move in the same direction until the limit hole 21 reaches the position corresponding to the limit photoelectric sensor 15, and the controller closes the lower cavity pressurization solenoid valve 17 and the upper cavity pressure relief solenoid valve 20 after detecting that the light receiver of the limit photoelectric sensor 15 receives the light signal, which is called a material suction step;
secondly, opening an upper cavity pressurization solenoid valve 19 and a lower cavity pressure relief solenoid valve 18, driving a connecting rod 10, a lower cavity plunger 13 and a light barrier 14 to move upwards together by an upper cavity plunger 6 under the pushing of liquid pressure, detecting an output signal of the liquid level sensor 3 by the controller till a signal that the output liquid level of the liquid level sensor 3 reaches is detected, and the step is called an exhaust step;
third, when the metering hole 22 of the light barrier 14 continuously passes through the metering photoelectric sensor 16, the controller detects and records the pulse number output by the light receiver 162 of the metering photoelectric sensor 16, which is called a measuring step;
in the fourth step, the controller calculates the amount of liquid to be measured discharged from the pump body 4 according to the received pulse number, the distance between the metering holes and the sectional area of the metering cavity 5, which is called a calculation step.
And completing the metering of the hydraulic metering pump through the first step to the fourth step.
When the novel hydraulic metering pump is used, the inlet ends of an upper cavity pressurization solenoid valve 19 and a lower cavity pressurization solenoid valve 17 are connected with hydraulic pressure, an upper cavity plunger 6 is in sliding seal fit with the inner wall of an upper cavity, and a lower cavity plunger 13 is in sliding seal fit with the inner wall of a lower cavity. When the lower cavity pressurization solenoid valve 17 is opened, pressure is introduced into the lower pressure cavity 12, the upper cavity pressure relief solenoid valve 20 is opened, at the moment, the pressure pushes the lower cavity plunger 13 to move downwards, the upper cavity plunger 6 moves downwards under the driving of the connecting rod 10, vacuum is formed in the metering cavity 5, and liquid to be measured enters the metering cavity 5 through the feeding valve 1. When the lower cavity plunger 13 drives the light barrier 14 to reach the lower limit, namely the limit photoelectric sensor 15 detects a signal, the lower cavity pressurizing electromagnetic valve 17 and the upper cavity pressure relief electromagnetic valve 20 are closed, and at the moment, the full suction state is achieved;
when the upper cavity pressurization electromagnetic valve 19 and the lower cavity pressure relief electromagnetic valve 18 are opened, the upper cavity plunger 6 moves upwards under the action of pressure to discharge the liquid to be measured from the discharge valve 2, at the moment, the metering photoelectric sensor 16 detects a plurality of pulse signals, the number of the pulse signals is recorded, the total liquid amount discharged from the pump body 4 can be calculated according to the liquid amount discharged from the pump body in the time interval between the pulse signals, and at the moment, the metering is finished;
when air enters the metering cavity 5 through the feed valve 1, the floater of the liquid level sensor 3 moves downwards to enable the liquid level sensor 3 to be conducted, at the moment, the air needs to be discharged firstly and then metered, and when the upper cavity plunger 6 moves upwards, the controller detects that the liquid level sensor 3 is in a state of detecting a liquid level reaching signal, the air is proved to be discharged completely, and at the moment, the air can be metered accurately.
The above are merely preferred embodiments of the present invention, and are not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a novel hydraulic metering pump, includes the pump body (4), its characterized in that, the pump body (4) will through baffle (8) that sets up the pump body (4) inner chamber falls into epicoele and cavity of resorption, epicoele sliding seal cooperation epicoele plunger (6), epicoele plunger (6) divide into measurement chamber (5) and last pressure chamber (7) with the epicoele, cavity of resorption sliding seal cooperation cavity of resorption plunger (13), baffle (8) with cavity of resorption inner wall forms cavity of resorption (12), cavity of resorption plunger (13) through connecting rod (10) that set up with cavity of resorption plunger (6) is connected, cavity of resorption plunger (10) through connecting rod sealing washer (9) and baffle (8) interior pore wall sliding seal cooperation, solenoid valve (12) fixed connection pressurization (17) and cavity of resorption pressure release solenoid valve (18) down, go up pressure chamber (7) fixed connection epicoele pressurization solenoid valve (19) and epicoele pressure release solenoid valve (20), measurement chamber (5) fixed connection feed valve (1) and bleeder valve (2) and level sensor (3).
2. The novel hydraulic metering pump of claim 1, wherein: the lower cavity plunger (13) is fixedly connected with a light barrier (14), and the light barrier (14) penetrates through the bottom of the pump body (4).
3. The novel hydraulic metering pump of claim 2, wherein: the light barrier (14) is a solid light-tight plate, one side of the light barrier is provided with a light-transmitting limiting hole (21), and the other side of the light barrier is provided with a plurality of light-transmitting metering holes (22) which are uniformly arranged.
4. A novel hydraulic metering pump according to claim 3, characterized in that: the device is characterized in that a limiting photoelectric sensor (15) matched with a limiting hole (21) of the light barrier (14) and a metering photoelectric sensor (16) matched with a metering hole (22) are arranged at the bottom of the pump body (4), the limiting photoelectric sensor (15) and the metering photoelectric sensor (16) are both composed of a light emitter and a light receiver, and the light barrier (14) is located between the light emitter and the light receiver.
5. The novel hydraulic metering pump of claim 1, wherein: metering chamber (5) are equipped with level sensor (3), level sensor (3) feed valve (1) reaches bleeder valve (2) all set up the pump body (4) top, level sensor (3) detect the liquid position in metering chamber (5), level sensor (3) detect the liquid position and do not reach the pulse quantity who stops the record and measure photoelectric sensor (16) output when setting for the height.
6. The novel hydraulic metering pump of claim 1, wherein: the metering cavity (5), the upper pressure cavity (7) and the lower pressure cavity (12) are all set to be closed inner cavities.
7. The novel hydraulic metering pump of claim 1, wherein: the feed valve (1) and the discharge valve (2) are both set to be one-way valves.
8. The novel hydraulic metering pump of claim 1, wherein: a connecting rod sealing ring (9) and a gland (11) are arranged between the connecting rod (10) and the inner wall of the clapboard (8).
9. A measuring method of a novel hydraulic metering pump is characterized by comprising the following steps: a novel hydraulic metering pump according to any one of claims 1 to 9, comprising the steps of:
firstly, when a controller is powered on, a limit photoelectric sensor (15) enables a light receiver to be in a state of not receiving light signals due to the fact that a solid part of a light barrier (14) is shielded, at the moment, the controller controls a lower cavity pressurization electromagnetic valve (17) and an upper cavity pressure relief electromagnetic valve (20) to be opened, a lower cavity plunger (13) moves downwards under the pushing of pressure to drive the light barrier (14) to move in the same direction until a limit hole (21) reaches a position corresponding to the limit photoelectric sensor (15), the lower cavity pressurization electromagnetic valve (17) and the upper cavity pressure relief electromagnetic valve (20) are closed after the light receiver of the limit photoelectric sensor (15) receives the light signals, and the material suction step is called;
secondly, opening an upper cavity pressurization solenoid valve (19) and a lower cavity pressure relief solenoid valve (18), driving a connecting rod (10), a lower cavity plunger (13) and a light barrier (14) to move upwards together by an upper cavity plunger (6) under the pushing of pressure, detecting an output signal of the liquid level sensor (3) by a controller at the moment until detecting that a signal that the liquid level output by the liquid level sensor (3) reaches is detected, and the step is called as an exhaust step;
thirdly, the metering hole (22) on the light barrier (14) continuously passes through the metering photoelectric sensor (16), the light receiver of the metering photoelectric sensor (16) continuously sends out pulse signals along with the pulse signals, and the pulse number output by the light receiver of the metering photoelectric sensor (16) is detected and recorded, which is called as a measuring step;
fourthly, the controller calculates the amount of the liquid to be measured discharged out of the pump body (4) according to the received pulse number, the distance between the adjacent holes of the metering holes (22) and the sectional area of the metering cavity (5), and the calculation is called as a calculation step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110492007.XA CN113175422B (en) | 2021-05-06 | 2021-05-06 | Novel hydraulic metering pump and measuring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110492007.XA CN113175422B (en) | 2021-05-06 | 2021-05-06 | Novel hydraulic metering pump and measuring method thereof |
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| CN113175422A true CN113175422A (en) | 2021-07-27 |
| CN113175422B CN113175422B (en) | 2023-03-24 |
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| CN202110492007.XA Active CN113175422B (en) | 2021-05-06 | 2021-05-06 | Novel hydraulic metering pump and measuring method thereof |
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| CN212360062U (en) * | 2020-05-13 | 2021-01-15 | 上海雅燊电子技术有限公司 | Pneumatic metering pump |
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| DE102009044268B3 (en) * | 2009-10-16 | 2010-12-02 | Christ, Herbert, Dipl.-Ing. | System for detection of an oil mist, at potential hot spots, has an optical sensor at the inflow channel into a double membrane suction pump using a permanent magnet and coil for membrane vibration |
| CN201972872U (en) * | 2010-12-29 | 2011-09-14 | 大庆德美特尔泵业制造有限公司 | Large discharge diaphragm metering pump with oil filling limit and automatic deflation system |
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| Publication number | Publication date |
|---|---|
| CN113175422B (en) | 2023-03-24 |
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