Synergistic pressurizing device of plunger pump

Abstract

The invention relates to a plunger pump collaborative pressurizing device which comprises a first plunger pump, a second plunger pump and a motor, a piston rod of the first plunger pump and a piston rod of the second plunger pump are driven by the motor through a gear rack mechanism or a lead screw mechanism, and a rodless cavity of the first plunger pump and a rodless cavity of the second plunger pump are active pressurizing cavities. A rod cavity of the first plunger pump and a rod cavity of the second plunger pump are cooperative pressurizing cavities; the active pressurizing cavity and the cooperative pressurizing cavity are each provided with a fluid inlet and a fluid outlet, and the fluid inlets and the fluid outlets are each provided with a switch valve. The device is small in occupied area, simple in structure and convenient to carry, transport and use, and the application range is widened.

Description

Technical Field

[0001] The invention relates to a plunger pump cooperative pressurizing device, belonging to the technical field of fluid pressurization. Background Art

[0002] In modern industrial production, fluids such as liquids, gases, and liquid-gas mixtures often need to be pressurized. At the same time, a large amount of fluids carrying pressure energy (including liquids, gases, liquid-gas mixtures, etc.) are often generated in the production process and are directly discharged, causing energy waste.

[0003] Take reverse osmosis desalination as an example. It is one of the mainstream technologies for desalination. This method uses reverse osmosis membrane to separate ions and water molecules contained in seawater. The pressure of seawater entering the reverse osmosis membrane must be higher than the osmotic pressure of the reverse osmosis membrane (usually between 4MPa and 6MPa). After the reverse osmosis membrane is filtered to produce fresh water, the concentrated seawater discharged is still as high as 4-6MPa, containing extremely high potential energy. If it is discharged directly, it will inevitably cause great energy waste. In order to reduce energy consumption and also reduce the production cost of seawater desalination, the reverse osmosis membrane desalination system is generally equipped with an energy recovery device to recover the potential energy of concentrated seawater.

[0004] The applicant searched and found that a seawater desalination system was disclosed in a Chinese patent with publication number CN105800734A. The system uses a fan to drive two sets of plunger pumps to recycle the residual pressure of concentrated water discharged from the reverse osmosis membrane to desalinate seawater. However, it is very difficult to control the two sets of plunger pumps synchronously, and the traditional hydraulic system has a complex structure and it is difficult to completely prevent hydraulic oil dripping. After the synchronization is accurately debugged, it will become asynchronous after running for a period of time, resulting in excessive water pressure fluctuations, which can easily damage the reverse osmosis membrane, thereby reducing production efficiency. In addition, the size of the hydraulic pump is often large, which is not conducive to reducing the space occupied by the equipment, and it cannot be directly applied to other scenarios, such as petroleum, chemical, food, marine biochemistry and other fields. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an electric pressurized plunger pump device which occupies a small volume and has a simple structure.

[0006] In order to solve the above technical problems, one of the technical solutions proposed in the present invention is: a plunger pump cooperative pressurizing device, comprising a first plunger pump, a second plunger pump and a motor, the piston rod of the first plunger pump is connected to a first rack, the piston rod of the second plunger pump is connected to a second rack, the first rack, the second rack, the piston rod of the first plunger pump, and the piston rod of the second plunger pump are parallel to each other, and a driving gear matching the first rack and the second rack is provided on the output shaft of the motor, and the driving gear is located between the first rack and the second rack; the rodless chamber of the first plunger pump and the rodless chamber of the second plunger pump are active pressurizing chambers, and the rod chamber of the first plunger pump and the rod chamber of the second plunger pump are cooperative pressurizing chambers; the active pressurizing chamber and the cooperative pressurizing chamber are both provided with a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are both provided with switch valves.

[0007] In order to solve the above technical problems, the second technical solution proposed in the present invention is: a plunger pump cooperative pressurizing device, comprising a first plunger pump, a second plunger pump, a motor and a screw mechanism, the piston rod of the first plunger pump and the piston rod of the second plunger pump are both connected to the screw of the screw mechanism, the screw of the screw mechanism, the piston rod of the first plunger pump and the piston rod of the second plunger pump are all parallel to each other, and the nut of the screw mechanism is driven by the motor; the rodless chamber of the first plunger pump and the rodless chamber of the second plunger pump are active pressurizing chambers, and the rod chamber of the first plunger pump and the rod chamber of the second plunger pump are cooperative pressurizing chambers; the active pressurizing chamber and the cooperative pressurizing chamber are both provided with a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are both provided with switch valves.

[0008] When in use, the piston rods of the first plunger pump and the second plunger pump are driven by the motor, the active pressurizing chamber contains the liquid to be pressurized, and the cooperative pressurizing chamber contains the pressurized fluid. By reasonably setting the switch valve states of the fluid inlet and the fluid outlet, when the fluid in the active pressurizing chamber is pressurized, the pressure fluid in the cooperative pressurizing chamber can be pressurized cooperatively, so that the additional energy of the pressure fluid can be fully utilized, the energy utilization efficiency can be improved, the energy consumption can be reduced, and a significant energy-saving and carbon-reduction effect can be achieved. The detailed working process is detailed in the specific implementation method section.

[0009] The beneficial effects brought by the present invention are: 1) Compared with the hydraulically driven plunger pump pressurizing device in the prior art, the present invention uses a motor to drive the first and second plunger pumps by driving a gear rack mechanism or a screw mechanism. Because the structure of the gear rack mechanism or the screw mechanism is very compact, the present invention greatly reduces the occupied space of the whole device on the premise of satisfying the coordinated pressurization by the pressure liquid, which is convenient to carry, transport and use, and expands the scope of application. For example, it can be installed on a small fishing boat or even on an uninhabited desert island to solve the problem of fresh water collection and use for personnel, or it can be used in fields such as petroleum, chemical industry, food, marine biochemistry, etc. that require pressurized fluid.

[0010] 2) The present invention drives two groups of plunger pumps through one motor, and the motor speed can be kept constant, thereby avoiding the defect of large fluctuations in fluid pressure and flow rate when hydraulically driving the plunger pump in the prior art, and is conducive to the stability of the flow rate and pressure of the output pressurized fluid.

[0011] 3) The present invention no longer requires a hydraulic pump, thereby avoiding the pollution caused by hydraulic oil leakage and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] Figure 1 It is a schematic diagram of the principle of the first embodiment of the present invention.

[0014] Figure 2 yes Figure 1 Schematic diagram of top view (pipeline part omitted).

[0015] Figure 3 It is a schematic diagram of the principle of the second embodiment of the present invention.

[0016] Figure numerals: 1. first piston pump; 2. second piston pump; 3. first rack; 4. second rack; 5. driving gear; 6. first slide; 7. second slide; 8. first pin; 9. second pin; 10. motor; 11. first transmission gear; 12. second driving gear; 13. piston rod of the first piston pump; 14. piston rod of the second piston pump. DETAILED DESCRIPTION

[0017] Embodiment 1 This embodiment relates to a plunger pump cooperative pressurizing device for seawater desalination, such as Figure 1 and Figure 2 As shown, it includes a first plunger pump 1, a second plunger pump 2 and a motor 10, the piston rod of the first plunger pump 1 is connected to a first rack 3, the piston rod of the second plunger pump 2 is connected to a second rack 4, and the first rack 3, the second rack 4, the piston rod of the first plunger pump 1, and the piston rod of the second plunger pump 2 are all parallel to each other.

[0018] like Figure 1 and Figure 2 As shown, the motor 10 drives a driving gear 5 that matches the first rack 3 and the second rack 4. The driving gear 5 is directly mounted on the output shaft of the motor 10, or the motor 10 drives the driving gear 5 to rotate through a reduction gearbox, and the driving gear 5 is located between the first rack 3 and the second rack 4; the rodless chamber of the first plunger pump 1 and the rodless chamber of the second plunger pump 2 are active pressurization chambers, and the rod chamber of the first plunger pump 1 and the rod chamber of the second plunger pump 2 are cooperative pressurization chambers. The motor 10 in this embodiment is preferably a servo motor 10.

[0019] This embodiment uses a motor-driven plunger pump device for seawater desalination. Its working method is similar to the plunger pump in CN105800734A. The only difference is the driving method and arrangement method of the plunger pump. Its working process is as follows: like Figure 1 As shown, the rodless chamber of the first plunger pump is provided with a fluid inlet A1 and a fluid outlet B1, the rodless chamber of the second plunger pump is provided with a fluid inlet A2 and a fluid outlet B2, the rod chamber of the first plunger pump is provided with a fluid inlet C1 and a fluid outlet D1, and the rod chamber of the second plunger pump is provided with a fluid inlet C2 and a fluid outlet D2, wherein the fluid inlet A1 and the fluid inlet A2 are connected to the original seawater, the fluid outlet B1 and the fluid outlet B2 are connected to the water inlet of the reverse osmosis membrane group, the fluid inlet C1 and the fluid inlet C2 are connected to the high-pressure concentrated seawater outlet of the reverse osmosis membrane group, the fluid outlet D1 and the fluid outlet D2 directly discharge the high-pressure concentrated seawater collection device or directly discharge the high-pressure concentrated seawater, and each fluid inlet and fluid outlet is provided with a switch valve.

[0020] The motor 10 drives the driving gear 5 to rotate, and when the first rack 3 is driven downward and the second rack 4 is driven upward, the fluid inlet A1, the fluid outlet B2, the fluid inlet C2, and the fluid outlet D1 are closed, and the fluid inlet A2, the fluid outlet B1, the fluid inlet C1, and the fluid outlet D1 are opened. At this time, the high-pressure concentrated seawater enters the rod chamber of the first plunger pump, and the high-pressure concentrated seawater and the motor 10 jointly drive the raw seawater in the rodless chamber of the first plunger pump to be pressurized, so that the raw seawater enters the reverse osmosis membrane group for seawater desalination, and the high-pressure concentrated seawater in the rod chamber of the second plunger pump is discharged, and the raw seawater enters the second plunger pump. The rodless cavity of the plunger pump; when the first rack 3 goes up and the second rack 4 goes down, the fluid inlet A2, fluid outlet B1, fluid inlet C1, and fluid outlet D1 are closed, and the fluid inlet A1, fluid outlet B2, fluid inlet C2, and fluid outlet D1 are opened. At this time, the high-pressure concentrated seawater enters the rod cavity of the second plunger pump, and the high-pressure concentrated seawater and the motor 10 jointly drive the raw seawater in the rodless cavity of the second plunger pump to be pressurized, so that the raw seawater enters the reverse osmosis membrane group for seawater desalination, and the high-pressure concentrated seawater in the rod cavity of the first plunger pump is discharged, and the raw seawater enters the rodless cavity of the first plunger pump. Such a cyclic reciprocating motion can continuously carry out the work of seawater desalination, which is beneficial to prolong the service life of the reverse osmosis membrane group and produce more stable water.

[0021] In addition to being applied to seawater desalination, this embodiment can also be applied to fields that require pressurization, such as petroleum, chemical industry, food, and marine biochemistry. As long as a stable high-pressure fluid can enter the cooperative pressurization chamber, the fluid to be pressurized (which can be a liquid, a gas, or a liquid-gas mixture) in the active pressurization chamber can be cooperatively pressurized, thereby making full use of the additional energy of the pressure fluid and improving energy utilization efficiency.

[0022] Embodiment 2 This embodiment is an improvement on the first embodiment, and the difference from the first embodiment is that: Figure 3 As shown, the piston rod of the first plunger pump 1 also serves as the first rack 3 , and the piston rod of the second plunger pump 2 also serves as the second rack 4 .

[0023] If the distance between the first rack 3 and the second rack 4 is too large, a first transmission gear 11 may be added between the driving gear 5 and the first rack 3 , and a second transmission gear may be added between the driving gear 5 and the second rack 4 .

[0024] Embodiment 3 The difference between this embodiment and the first embodiment is that: this embodiment no longer uses a gear rack mechanism to drive the first plunger pump 1 and the second plunger pump 2 to move, but uses a screw mechanism to drive the first plunger pump 1 and the second plunger pump 2 to move, and the screw mechanism is composed of a screw and a nut; the piston rod of the first plunger pump 1 and the piston rod of the second plunger pump 2 are both connected to the screw of the screw mechanism, the screw of the screw mechanism, the piston rod of the first plunger pump 1, and the piston rod of the second plunger pump 2 are all parallel to each other, and the nut of the screw mechanism is driven by a motor 10.

[0025] The working process and application field of this embodiment are basically the same as those of the first embodiment and will not be described in detail.

Claims

1. A plunger pump cooperative pressurizing device, characterized in that: It comprises a first plunger pump, a second plunger pump and a motor, wherein the piston rod of the first plunger pump is connected to a first rack, the piston rod of the second plunger pump is connected to a second rack, the first rack, the second rack, the piston rod of the first plunger pump and the piston rod of the second plunger pump are parallel to each other, and a driving gear matched with the first rack and the second rack is provided on the output shaft of the motor, and the driving gear is located between the first rack and the second rack; The rodless chamber of the first plunger pump and the rodless chamber of the second plunger pump are active pressurizing chambers, and the rod chamber of the first plunger pump and the rod chamber of the second plunger pump are cooperative pressurizing chambers; The active pressurizing chamber and the cooperative pressurizing chamber are both provided with a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are both provided with a switch valve.

2. The plunger pump cooperative pressurizing device according to claim 1, characterized in that: The motor is a servo motor.

3. The plunger pump cooperative pressurizing device according to claim 1 or 2, characterized in that: The driving gear is directly mounted on the output shaft of the motor.

4. The plunger pump cooperative pressurizing device according to claim 1 or 2, characterized in that: The motor drives the driving gear to rotate through the reduction box.

5. The plunger pump cooperative pressurizing device according to claim 1 or 2, characterized in that: The piston rod of the first plunger pump also serves as the first rack, and the piston rod of the second plunger pump also serves as the second rack.

6. A plunger pump cooperative pressurizing device, characterized in that: It comprises a first plunger pump, a second plunger pump, a motor and a screw mechanism, wherein the piston rod of the first plunger pump and the piston rod of the second plunger pump are both connected to the screw of the screw mechanism, the screw of the screw mechanism, the piston rod of the first plunger pump and the piston rod of the second plunger pump are all parallel to each other, and the nut of the screw mechanism is driven by the motor; the rodless chamber of the first plunger pump and the rodless chamber of the second plunger pump are active pressurizing chambers, and the rod chamber of the first plunger pump and the rod chamber of the second plunger pump are cooperative pressurizing chambers; The active pressurizing chamber and the cooperative pressurizing chamber are both provided with a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are both provided with a switch valve.

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