A reverse flush system for a plunger pump, a plunger pump and a flush control method

Abstract

This invention discloses a plunger pump backflushing system, a plunger pump, and a flushing control method. The system includes a water tank located on the plunger pump body, equipped with a water injection mechanism, a water outlet mechanism, and a return mechanism. The water outlet mechanism is connected to a drain pipe at the bottom of the plunger pump body via a pipeline, and the drain pipe is connected to a lower riser pipe at the lower end of the plunger pump body. The return mechanism is connected to an upper riser pipe at the upper end of the plunger pump body, forming a closed-loop pipeline. By installing the flushing system on the pump body, the flushing system functions as an accessory to the pump, not as a standalone system. It does not require an external power source to pressurize the flushing medium and can achieve backflushing based on the pressure difference between the pump's own seal and the water tank. The plunger assembly can be manually flushed, improving the lifespan of vulnerable parts and achieving flushing and lubrication of the plunger assembly.

Description

Technical Field

[0001] This invention relates to the field of plunger pump equipment technology, and in particular to a plunger pump backflushing system, a plunger pump, and a flushing control method. Background Technology

[0002] Reciprocating pumps include piston pumps, metering pumps, and diaphragm pumps, collectively known as reciprocating pumps. They are a type of positive displacement pump and are widely used. Reciprocating pumps are conveying machines that directly provide energy to the liquid in the form of pressure energy through the reciprocating motion of a piston. Traditional reciprocating pumps have the following problems when conveying easily crystallizing media:

[0003] 1. When a plunger pump is running, the medium flows along the plunger, seal, and other surfaces at a certain flow rate. Medium containing solid particles is difficult to deposit. However, if the pump stops running, the medium will quickly deposit on the plunger surface and form crystals. When the pump is restarted, these crystals can easily damage the plunger and mechanical seal surfaces, greatly reducing the life of vulnerable parts.

[0004] 2. Some media are corrosive. If the pump is stopped for a long time, the media deposited on the plunger surface can easily corrode the plunger and seal, resulting in short service life of vulnerable parts and seal failure.

[0005] 3. Generally, plunger pumps for conveying special media have an independent high-pressure water cleaning system. During the plunger's movement, a high-pressure cleaning pump continuously injects high-pressure water around the plunger, forming a high-pressure sealing water ring. This ring washes away the slurry media adhering to the plunger surface and isolates the media from the plunger seal, thus extending the service life of the plunger and seal, achieving reliable slurry delivery. However, this structure increases the overall cost of the plunger pump. Furthermore, leaks in the flushing water are difficult to detect and cannot be recovered; the flushing system also stops working when the pump stops. Prolonged pump shutdown can lead to crystal formation and corrosion on the plunger surface, reducing the lifespan of vulnerable parts. Summary of the Invention

[0006] In view of the above-mentioned defects or deficiencies, the purpose of this invention is to provide a plunger pump backflushing system.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A plunger pump backflushing system includes: a water tank located on the plunger pump body, the water tank being equipped with a water injection mechanism, a water outlet mechanism, and a return mechanism, wherein the water outlet mechanism is connected to a drain pipe at the bottom of the plunger pump body via a pipeline, the drain pipe is connected to a lower vertical pipe at the lower end of the plunger pump body, and the return mechanism is connected to an upper vertical pipe at the upper end of the plunger pump body, forming a closed-loop pipeline.

[0009] The water tank is equipped with a level gauge for monitoring the water level.

[0010] The water injection mechanism includes a flushing water inlet located at the top of the water tank, and a control valve is provided on the flushing water inlet.

[0011] The control valve is a solenoid valve.

[0012] The water outlet mechanism includes: a flushing pipe located at the bottom of the water tank and a control pipe connected to the sewage pipe. The flushing pipe is connected to the control pipe, and a valve is installed on the control pipe.

[0013] The valve is either a manually controlled valve or a solenoid-controlled valve.

[0014] The sewage discharge pipeline includes: a manifold connected to the control pipeline, the manifold being connected to the lower vertical pipe at the lower end of the plunger pump body, and a return branch connected to the pump inlet on one side of the manifold, and the return branch being equipped with a one-way valve.

[0015] A plunger pump includes a plunger pump body, wherein the plunger pump body is equipped with the aforementioned plunger pump backflushing system at its upper end.

[0016] A flushing control method for a plunger pump backflushing system includes:

[0017] Fill the water tank with water so that the water in the tank sequentially fills the drain pipe at the bottom of the plunger, the lower riser at the bottom of the plunger pump body, the upper riser at the top of the plunger pump body, and the return mechanism, until the water level is level with the water outlet of the water tank.

[0018] When the plunger pump stops running, the water in the lower vertical pipe at the bottom of the plunger pump body and the upper vertical pipe at the top of the plunger pump body undergo ion exchange with the residual medium on the plunger surface.

[0019] After being discharged through the sewage pipe, the plunger assembly is flushed.

[0020] A pressure gauge is installed on the water tank;

[0021] When the pump plunger assembly seal fails, the medium flows from the high-pressure area to the low-pressure area, causing the pressure in the water tank to rise and the liquid level to increase. The pressure gauge reading is used to determine whether a leak has occurred.

[0022] When the liquid level continues to rise and the pressure continues to increase, and the pressure of the flushing system is higher than that of the suction pipe, the drain pipe opens to discharge the water, and the water automatically flows back into the suction pipe to prevent leakage of the medium due to seal failure.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] This invention provides a plunger pump backflushing system, a plunger pump, and a flushing control method. By incorporating the flushing system into the pump body, the flushing system functions as an accessory, not as a standalone component. It does not require an external power source to pressurize the flushing medium; backflushing is achieved solely through the pressure difference between the pump's own seal and the water tank. The plunger assembly can be manually flushed, improving the lifespan of vulnerable components and enabling flushing and lubrication of the plunger assembly.

[0025] Furthermore, the present invention is equipped with a water level gauge and a control switch, which can automatically replenish the liquid according to the preset water level threshold, realize the automatic water addition of the flushing system, and reduce manual operation time.

[0026] Furthermore, a return branch is set up, and the branch is equipped with a check valve to realize the return of the leaked liquid in the event of a leak by means of changes in system pressure. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the plunger pump backflushing system of the present invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the plunger pump backflushing system of the present invention. Figure 1 ;

[0029] Figure 3 This is a schematic diagram of the plunger pump backflushing system of the present invention. Figure 3 .

[0030] In the diagram, 1—water tank; 2—plunger pump body; 3—lower riser; 4—flushing water inlet; 5—level gauge; 6—flushing pipe; 7—sewage pipe; 8—control pipe; 9—valve; 10—manifold; 11—check valve; 12—upper riser; 13—pressure gauge; 14—return branch; 15—control valve. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the protection scope of the present invention.

[0032] like Figure 1-3 As shown, the present invention provides a plunger pump backflushing system, including: a water tank 1 located on the plunger pump body 2, wherein the water tank is provided with a water injection mechanism, a water outlet mechanism and a return mechanism, wherein the water outlet mechanism is connected to a sewage discharge pipe 7 at the bottom of the plunger pump body 2 through a pipe, the sewage discharge pipe 7 is connected to a lower vertical pipe 3 at the lower end of the plunger pump body 2, and the return mechanism is connected to an upper vertical pipe 12 at the upper end of the plunger pump body 2, forming a closed loop pipeline.

[0033] Preferably, the water tank 2 in this invention is equipped with a level gauge 5 and a pressure gauge 13 for monitoring the water level. When the pressure in the flushing system's water tank rises and the water level increases, the pressure gauge reading can be observed to determine if a leak has occurred and whether vulnerable parts need replacement. If the pressure gauge reading is not detected in time, and the water level continues to rise, the pressure will increase until the flushing system pressure exceeds that of the suction pipe. In this case, the return check valve will open, and the liquid will automatically flow back into the suction pipe, preventing leakage due to seal failure.

[0034] Specifically, the water injection mechanism of this invention includes: a flushing water inlet 4 disposed at the upper end of the water tank, and a control valve disposed on the flushing water inlet 4, for example, the control valve being a solenoid valve. The water outlet mechanism includes: a flushing pipe 6 disposed at the bottom of the water tank 1 and a control pipe 8 connected to the sewage discharge pipe 7, the flushing pipe 6 being connected to the control pipe 8, and a valve 9 installed on the control pipe 8, for example, the valve 9 being a manual control valve or a solenoid control valve.

[0035] The sewage discharge pipeline 7 includes a manifold 10 connected to the control pipeline 8. The manifold 10 is connected to the lower vertical pipe 3 at the lower end of the plunger pump body 2. A return branch 14 connected to the pump inlet is provided on one side of the manifold 10. The return branch 14 is equipped with a one-way valve 11. A branch of the flushing system is connected to the return and equipped with a one-way valve. The one-way valve is designed with a reasonable opening pressure so that when the plunger seal leaks, the leaked medium can flow back to the suction through the one-way valve.

[0036] The working principle of the device of the present invention is as follows:

[0037] When the pump is running normally, the level gauge detects that the water tank is empty and controls the water supply to add water to the tank via a solenoid valve. Water from the tank first fills the drain pipe at the bottom of the plunger through the flushing system pipeline at the bottom of the tank (at which point the ball valve is closed), then sequentially fills the riser pipe below the plunger, the plunger assembly gap, and the riser pipe above the plunger, until the water level is level with the water outlet of the tank. The presence of clean water inside the flushing system pipeline prevents crystallization of the medium from causing wear on the plunger surface and seals, while also providing lubrication during the plunger's reciprocating motion and carrying away a small amount of heat.

[0038] When the pump stops running, the water in the flushing system tank can undergo ion exchange with the plunger assembly surface, diluting the residual medium on the plunger surface, preventing crystallization, and effectively reducing corrosion of the plunger. Furthermore, the plunger assembly can be flushed by opening the drain ball valve. This ensures the pump can start normally for reuse and effectively extends the life of vulnerable parts.

[0039] When the pump plunger assembly seal fails, the medium flows from the high-pressure area to the low-pressure area, causing the pressure in the flushing system water tank to rise and the liquid level to increase. At this time, the pressure gauge reading can be observed to determine whether a leak has occurred and whether the vulnerable parts need to be replaced. If the pressure gauge reading is not detected in time, the liquid level will continue to rise and the pressure will continue to increase. When the flushing system pressure is higher than that of the suction line, the return check valve will open, and the liquid will automatically flow back into the suction line, preventing the medium from leaking due to seal failure.

[0040] In addition, the present invention also provides a plunger pump, wherein the plunger pump body 2 is equipped with the above-mentioned plunger pump backwashing system.

[0041] The plunger pump backflushing system mainly consists of a one-way solenoid valve, a level sensor, a pressure sensor, pipelines, a manual branch, and an automatic reflux system. It can manually activate to backflush the plunger assembly; it can monitor plunger assembly seal failure; and it can automatically perform periodic cleaning of the plunger assembly to prevent media crystallization and maintain the lifespan of vulnerable components.

[0042] Furthermore, the present invention also provides a flushing control method for a plunger pump backflushing system, comprising:

[0043] Fill the water tank 1 with water so that the water in the water tank 1 sequentially fills the drain pipe 7 at the bottom of the plunger, the lower riser pipe 3 at the lower end of the plunger pump body 2, the upper riser pipe 12 at the upper end of the plunger pump body 2, and the return mechanism until the water level is level with the water outlet of the water tank 1.

[0044] When the plunger pump body 2 stops running, the water in the lower vertical pipe 3 at the lower end of the plunger pump body 2 and the upper vertical pipe 12 at the upper end of the plunger pump body 2 undergoes ion exchange with the residual medium on the plunger surface.

[0045] After being discharged through the sewage pipe 7, the plunger assembly is flushed.

[0046] Preferably, the water tank 1 in this invention is equipped with a pressure gauge 13;

[0047] When the pump plunger assembly seal fails, the medium flows from the high-pressure area to the low-pressure area, causing the pressure in water tank 1 to rise and the liquid level to rise. The reading of pressure gauge 13 is used to determine whether a leak has occurred.

[0048] When the liquid level continues to rise and the pressure continues to increase, and the pressure of the flushing system is higher than that of the suction pipe, the drain pipe 7 will open to discharge the water, and the water will automatically flow back into the suction pipe to prevent leakage of the medium due to seal failure.

[0049] It will be apparent to those skilled in the art that the above specific examples are merely preferred embodiments of the present invention. Therefore, any improvements or modifications that may be made by those skilled in the art to certain parts of the present invention still embody the principles of the present invention and achieve the objectives of the present invention, and all fall within the scope of protection of the present invention.

Claims

1. A reverse flushing system for a plunger pump, characterized in that, The utility model relates to a reverse flushing system of plunger pump, comprising: a water tank (1) is arranged on the plunger pump body (2), and the water tank is provided with a water injection mechanism, a water outlet mechanism and a backflow mechanism, wherein the water outlet mechanism is communicated with a blowdown pipeline (7) at the bottom of the plunger pump body (2) through a pipeline, the blowdown pipeline (7) is communicated with a lower vertical pipe (3) at the lower end of the plunger pump body (2), the backflow mechanism is communicated with an upper vertical pipe (12) at the upper end of the plunger pump body (2), and a closed circulation pipeline is formed; the water tank (1) is provided with a pressure gauge (13); when the plunger pump combination seal fails, medium flows from the high-pressure area to the low-pressure area, so that the pressure in the water tank (1) rises, the liquid level rises, and whether leakage occurs is judged according to the reading of the pressure gauge (13); when the liquid level continues to rise and the pressure continues to rise, the blowdown pipeline (7) is opened to discharge when the flushing system pressure is higher than the suction pipeline, and water is automatically backflowed into the suction pipeline, thereby preventing the medium from leaking out due to seal failure.

2. The plunger pump backflush system of claim 1, wherein, The water tank (1) is provided with a liquid level meter (5) for monitoring the water level.

3. The plunger pump backflush system of claim 1 or 2, wherein, The water injection mechanism comprises a flushing water inlet (4) arranged at the upper end of the water tank, and a control valve (15) is arranged on the flushing water inlet (4).

4. The plunger pump backflush system of claim 3, wherein, The control valve (15) is an electromagnetic valve.

5. The reverse flushing system for a piston pump according to claim 1 or 2, characterized in that, The water outlet mechanism comprises a flushing pipe (6) arranged at the bottom of the water tank (1) and a control pipeline (8) communicated with the blowdown pipeline (7), the flushing pipe (6) is communicated with the control pipeline (8), and a valve (9) is installed on the control pipeline (8).

6. The plunger pump backflush system of claim 5, wherein, The valve (9) is a manually controlled valve or an electromagnetic controlled valve.

7. The plunger pump backflush system of claim 5, wherein, The blowdown pipeline (7) comprises a confluence pipe (10) communicated with the control pipeline (8), the confluence pipe (10) is communicated with the lower vertical pipe (3) at the lower end of the plunger pump body (2), one side of the confluence pipe (10) is provided with a backflow branch (14) communicated with the pump suction inlet, and the backflow branch (14) is provided with a one-way valve (11).

8. A piston pump characterized in that The utility model relates to a plunger pump body (2), and the plunger pump body (2) is provided with the reverse flushing system of plunger pump of any one of claims 1-7 on the upper end.

9. A method of flush control for a reverse flush system of a plunger pump according to claim 1, characterized in that, The utility model relates to a reverse flushing system of plunger pump, comprising: the water tank (1) is filled with water, so that the water in the water tank (1) fills the blowdown pipeline (7) at the bottom of the plunger, the lower vertical pipe (3) at the lower end of the plunger pump body (2), the upper vertical pipe (12) at the upper end of the plunger pump body (2) and the backflow mechanism in sequence, and is flush with the water level at the water outlet of the water tank (1); when the plunger pump body (2) stops running, the water in the lower vertical pipe (3) at the lower end of the plunger pump body (2) and the upper vertical pipe (12) at the upper end of the plunger pump body (2) exchanges ions with the residual medium on the surface of the plunger; after being discharged through the blowdown pipeline (7), the plunger combination is flushed, and the water tank (1) is provided with a pressure gauge (13); when the plunger pump combination seal fails, medium flows from the high-pressure area to the low-pressure area, so that the pressure in the water tank (1) rises, the liquid level rises, and whether leakage occurs is judged according to the reading of the pressure gauge (13); When the liquid level continues to rise, the pressure continues to rise, and the flushing system pressure is higher than the suction pipeline, the blowdown pipeline (7) is opened to discharge, and the water is automatically returned to the suction pipeline to prevent the medium from leaking due to seal failure.

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