A piston metering pump with easy replacement

Abstract

The application discloses a plunger type metering pump convenient to replace, which comprises a pump head body and a plunger, and a packing chamber which comprises a mounting cylinder, packing, a compression ring, a compression spring and a compression disc. A flange plate is arranged at the left end of the mounting cylinder, the flange plate is fixedly connected with the pump head body through bolts, a sealing cover is arranged on the flange plate, an adjusting screw is threadedly connected on the sealing cover, the inner end of the adjusting screw is fixedly connected with the compression disc, the plunger is slidingly installed at the right end of the mounting cylinder, a sealing groove for sealingly connecting the plunger is arranged on the inner wall of the mounting cylinder, the packing is installed in the sealing groove, the compression ring is installed at the left side of the packing, and the compression spring is installed between the compression ring and the compression disc. The compression spring continuously provides the packing with a compression force by pushing the compression ring, the service life and sealing performance of the sealing packing are improved, the pre-tightening force of the compression spring can be adjusted through the adjusting screw, and the period of regular compression or replacement of new packing sealing is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of metering pumps, in particular to a plunger-type metering pump which is easy to replace. Background Art

[0002] The plunger of a plunger metering pump generally uses a packing seal. Since the packing seal and the plunger are both wearing parts, they will become worn and unusable after a period of use. At this time, it is necessary to stop the machine and replace the plunger or seal. The technical defects of the plunger metering pump in the existing technology are: the service life of the sealing packing is short, and the packing seal needs to be tightened or replaced regularly. If the seal at the plunger activity is not good, it will easily cause the medium to leak. The sealing packing is often installed at the inner end of the pump head, and the housing, plunger and gland need to be disassembled before replacement. Disassembly is inconvenient, the workload is large, and the disassembly and assembly are difficult. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a plunger-type metering pump which is easy to replace, has strong sealing performance and is convenient for replacing sealing packing.

[0004] The cam is connected with the pump end face through the through-hole, and the pump end face has the outer cover which is provided with a circle, and the bottom cover is connected with the up-down knob of the cam, and the up-down knob of the cam is connected with the up-down knob of the cam.

[0005] For further improvement, a collecting cylinder is fixedly installed on the pump head body, a first sealing ring is provided between the left end of the collecting cylinder and the mounting cylinder, a second sealing ring is provided between the right end of the collecting cylinder and the plunger, a collecting interlayer is provided between the collecting cylinder and the mounting cylinder, and a collecting hole is provided between the collecting interlayer and the sealing groove.

[0006] For further improvement, a discharge hole connected to the collecting interlayer is provided on the lower side wall of the collecting cylinder, a return pipe is provided between the discharge hole and the input end of the inlet one-way valve, a reversing valve is provided on the return pipe, and the reversing valve is connected to the discharge pipe.

[0007] For further improvement, an air-sealing device is provided in the collection interlayer, and the air-sealing device includes an energy storage spring and an airtight piston ring. The airtight piston ring is in sealed sliding connection with the collection cylinder and the mounting cylinder. The energy storage spring is arranged between the left side of the airtight piston ring and the collection cylinder, and the discharge hole is located on the right side of the airtight piston ring. The collection cylinder is provided with a left air nozzle and a right air nozzle, and the left air nozzle and the right air nozzle are respectively located on the left and right sides of the airtight piston ring.

[0008] For further improvement, an air pump is fixedly installed above the collecting cylinder, and the air pump includes an air cylinder and an air pump rod. The air cylinder is provided with a one-way air inlet and a one-way air outlet. The one-way air inlet and the one-way air outlet are respectively connected to the left air nozzle and the right air nozzle through the air pipe. The outer end of the air pump rod is fixedly connected with a damping slip ring, and the damping slip ring is connected to the plunger in a damping sliding manner.

[0009] For further improvement, the damping slip ring is provided with a fastening screw for fixing the connecting plunger.

[0010] For further improvement, a third sealing ring for sealingly connecting the mounting cylinder is fixedly mounted on the pressure plate.

[0011] For further improvement, both ends of the compression spring are fixedly connected to the pressure ring and the pressure plate respectively.

[0012] Further improvement is that the pressure ring has a conical expansion sleeve opening at one end facing the filler.

[0013] For further improvement, an elastic anti-loosening pad, a pre-tightening spring and an elastic sealing pad are provided between the adjusting screw and the sealing cover.

[0014] The beneficial effects of the present invention are: (1) the compression ring is pushed by the compression spring to continuously provide a pressing force for the packing, thereby improving the service life and sealing performance of the sealing packing, and the pre-tightening force of the compression spring can be adjusted by increasing the adjusting screw, thereby extending the period of regular tightening or replacement of the packing seal; (2) the installation cylinder and the pump head body are detachably connected, and the installation cylinder can be easily removed to disassemble the sealing packing or plunger, thereby reducing the difficulty of disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of Example 1;

[0016] Figure 2 This is a schematic structural diagram of Example 2;

[0017] Figure 3 This is a schematic structural diagram of Example 3;

[0018] Explanation of the accompanying symbols: 1. Pump head body, 2. Plunger, 3. Mounting cylinder, 4. Packing, 5. Pressure ring, 6. Compression spring, 7. Pressure plate, 8. Sealing cover, 9. Adjusting screw, 10. Through hole, 11. Sealing groove, 12. Collecting cylinder, 13. First sealing ring, 14. Second sealing ring, 15. Collecting interlayer, 16. Collecting hole, 17. Discharge hole, 18. Return pipe, 19. Energy storage spring, 20. Airtight piston ring, 21. Left air nozzle, 22. Right air nozzle, 22. Air pump, 23. One-way air inlet, 24. One-way air outlet, 25. Damping slip ring, 26. Fastening screw, 27. Third sealing ring, 28. Conical expansion sleeve, 29. Elastic anti-loosening pad, 30. Preload spring, 31. Elastic sealing pad. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] Refer to the attached Figure 1 : In this embodiment 1, a plunger metering pump that is easy to replace comprises a pump head body 1 and a plunger 2, a medium channel that runs longitudinally through the pump head body 1, an inlet one-way valve and an outlet one-way valve are provided on the medium channel, the pump head body 1 is provided with a piston chamber that runs transversely, and the piston chamber is connected to the medium channel; the plunger 2 is movably arranged in a packing chamber, and the packing chamber comprises a mounting cylinder 3, a packing 4, a pressure ring 5, a compression spring 6 and a pressure plate 7. The left end of the mounting cylinder 3 is provided with a flange, and the flange is fixedly connected to the pump head body 1 by bolts, a sealing cover 8 is provided on the flange, and an adjusting screw 9 is threadedly connected to the sealing cover 8. The inner end of the adjusting screw 9 is fixedly connected to the pressure plate 7, and the side wall of the mounting cylinder 3 is provided with a through hole 10 that connects the medium channel up and down, and the plunger 2 is slidably installed on the right end of the mounting cylinder 3, and a sealing groove 11 for sealingly connecting the plunger 2 is provided on the inner wall of the mounting cylinder 3, and the packing 4 is installed in the sealing groove 11, and a pressure ring 5 is installed on the left side of the packing 4, and a compression spring 6 is installed between the pressure ring 5 and the pressure plate 7.

[0021] Working Principle: When the packing 4 seal is worn and needs to be replaced, open the plunger pump housing, then unscrew the bolts on the flange of the mounting barrel 3 at the outer end of the pump head to separate it from the pump head body 1. Then use the bolts to pull the mounting barrel 3 out of the pump head body 1, separate the mounting barrel 3 from the plunger 2, and replace the entire component or the packing 4 part. If the plunger 2 is worn, it can be removed from the crosshead connected to it and then removed together with the mounting barrel 3. The entire process does not require disassembly of the pump head body 1, reducing the workload of replacing the plunger and sealing packing, and improving work efficiency. When it is necessary to replace part of the packing 4, the sealing cover 8 can be removed, and then the compression spring 6, pressure ring 5 and packing 4 can be removed in turn using external pliers. After replacing the new one, the sealing cover 8 can be fixed back on the mounting cylinder 3. The pressure plate 7 can be pushed left and right by adjusting the screw 9 to adjust the elastic preload force of the compression spring 6. The compression spring 6 can push the pressure ring 5 to continuously provide compression force for the packing 4, thereby improving the service life and sealing performance of the sealing packing and extending the cycle of regular tightening or replacement of new packing seals. When the plunger 2 moves to the left driven by the reciprocating drive mechanism, the plunger 2 squeezes the medium in the piston chamber and the medium channel from the outlet one-way valve. At this time, the internal medium has a rightward pressure on the pressure ring 5, which will increase the pressing force on the packing 4 and improve the sealing effect. When the plunger 2 moves to the right driven by the motor group and the reciprocating transmission device (crank slider mechanism), the plunger 2 sucks the medium from the inlet one-way valve into the piston chamber and the medium channel. At this time, the plunger 2 has a rightward sliding friction force on the pressure ring 5 (the friction force is less than the elastic preload force of the compression spring 6), which will increase the pressing force on the packing 4 and improve the sealing effect. This ensures the sealing of the plunger 2 during its movement and prevents leakage due to the packing 4.

[0022] As attached Figure 2 As shown in Example 2, on the basis of Example 1, a collecting cylinder 12 is fixedly installed on the pump head body, a first sealing ring 13 is provided between the left end of the collecting cylinder 12 and the mounting cylinder 3, a second sealing ring 14 is provided between the right end of the collecting cylinder 12 and the plunger 2, a collecting interlayer 15 is provided between the collecting cylinder 12 and the mounting cylinder 3, and a collecting hole 16 is provided between the collecting interlayer 15 and the sealing groove 11. The collecting cylinder 12 has a certain airtightness and has the function of preventing dust and leakage, which can reduce the amount of leakage of the medium from the gap between the collecting hole 16, the mounting cylinder and the plunger. Even if a small amount of leakage occurs, it can be temporarily stored in the collecting interlayer 15 of the collecting cylinder 12, which is not easy to cause pollution. When the head of the plunger 2 is relatively thick, the volume of the collecting interlayer 15 decreases and the air pressure increases during the process of the plunger 2 moving right into the collecting interlayer 15, which can further reduce the amount of medium leakage.

[0023] The lower sidewall of the collecting cylinder 12 is provided with a discharge hole 17 that communicates with the collecting interlayer 15. A return pipe 18 is provided between the discharge hole 17 and the input end of the inlet check valve. The return pipe 18 is provided with a reversing valve that is connected to the discharge pipe. If excessive leakage from the collecting cylinder 12 requires recovery, the leakage can flow through the return pipe 18 to the input end of the inlet check valve for reuse. If recovery is not required, the reversing valve can be used to switch the leakage to the discharge pipe for discharge.

[0024] An airtight device is provided in the collecting interlayer 15, and the airtight device includes an energy storage spring 19 and an airtight piston ring 20. The airtight piston ring 20 is in sealed sliding connection with the collecting cylinder 12 and the mounting cylinder 3. The energy storage spring 19 is arranged between the left side of the airtight piston ring 20 and the collecting cylinder 12. The discharge hole 17 is located on the right side of the airtight piston ring 20. The collecting cylinder 12 is provided with a left air nozzle 21 and a right air nozzle 22. The left air nozzle 21 and the right air nozzle 22 are respectively located on the left and right sides of the airtight piston ring 20. When the left air nozzle 21 and the right air nozzle 22 are opened, the right air nozzle 22 can be used to inflate air into the collecting tube 12 through the air pumping device. When the air pressure increases, the airtight piston ring 20 moves to the left to compress the energy storage spring 19, and the air on the left side of the airtight piston ring 20 is discharged through the left air nozzle 21. After the inflation is completed, the left air nozzle 21 and the right air nozzle 22 are closed, and the energy storage spring 19 can push the airtight piston ring 20 to the right to maintain the stability of the air pressure on the right side, thereby further improving the air sealing performance.

[0025] As attached Figure 3 As shown in Example 3, based on Example 2, an air pump 22 is fixedly installed above the collecting tube 12. The air pump 22 includes an air cylinder and an air pump rod. The air cylinder is provided with a one-way air inlet 23 and a one-way air outlet 24. The one-way air inlet 23 and the one-way air outlet 24 are respectively connected to the left air nozzle 21 and the right air nozzle 22 through air pipes. The outer end of the air pump rod is fixedly connected to a damping slip ring 25, and the damping slip ring 25 is connected to the plunger 2 in a damping sliding manner. When the plunger 2 moves left and right, it can drive the damping slip ring 25 to move, and the damping slip ring 25 drives the air pump rod to inflate. The gas in the left air nozzle 21 can be drawn into the right air nozzle 22 through the one-way air inlet 23 and the one-way air outlet 24, thereby maintaining the air pressure difference on both sides of the airtight piston ring 20.

[0026] The damping slip ring 25 is provided with a fastening screw 26 for fixing the plunger 2. The fastening screw 26 can adjust the sliding friction between the damping slip ring 25 and the plunger 2 or lock it to the plunger 2.

[0027] In Example 4, based on Example 1 or 3, a third sealing ring 27 is fixedly mounted on the pressure plate 7 for sealingly connecting the mounting cylinder 3. After the sealing connection, the sealing performance of the left end of the mounting cylinder 3 is improved, and the volume of the piston chamber can be adjusted when the pressure plate 7 moves.

[0028] The two ends of the compression spring 6 are fixedly connected to the pressure ring 5 and the pressure plate 7 respectively. The fixed connection can be selected by welding or other connection forms. When the pressure plate 7 is pulled out, the compression spring 6 can take the pressure ring 5 out together.

[0029] The pressure ring 5 has a tapered expansion opening 28 on one end facing the packing 4. This expansion opening 28 not only radially compresses the packing 4 against the plunger, but also expands to create an interference fit, improving friction and sealing performance with the inner wall of the mounting cylinder. An elastic locking washer 29, a preload spring 30, and an elastic sealing washer 31 are installed between the adjusting screw 9 and the sealing cap 8 to prevent the adjusting screw 9 from loosening.

[0030] Although the invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A plunger-type metering pump that is easy to replace, comprising a pump head body (1) and a plunger (2), wherein the pump head body (1) has a longitudinally extending medium channel, the medium channel is provided with an inlet check valve and an outlet check valve, the pump head body (1) is provided with a transversely extending piston chamber, the piston chamber is connected to the medium channel; the plunger (2) is movably arranged in a packing chamber, and is characterized in that: The packing chamber comprises a mounting cylinder (3), a packing (4), a pressure ring (5), a compression spring (6) and a pressure plate (7). A flange is provided at the left end of the mounting cylinder (3), and the flange is fixedly connected to the pump head body (1) by bolts. A sealing cover (8) is provided on the flange, and an adjusting screw (9) is threadedly connected to the sealing cover (8). The inner end of the adjusting screw (9) is fixedly connected to the pressure plate (7). A through hole (10) for connecting the upper and lower medium channels is provided on the side wall of the mounting cylinder (3). A plunger (2) is slidably mounted on the right end of the mounting cylinder (3), and a sealing groove for sealing the plunger (2) is provided on the inner wall of the mounting cylinder (3). (11), a packing (4) is installed in the sealing groove (11), a pressure ring (5) is installed on the left side of the packing (4), a compression spring (6) is installed between the pressure ring (5) and the pressure plate (7), a collecting cylinder (12) is fixedly installed on the pump head body, a first sealing ring (13) is provided between the left end of the collecting cylinder (12) and the mounting cylinder (3), a second sealing ring (14) is provided between the right end of the collecting cylinder (12) and the plunger (2), a collecting interlayer (15) is provided between the collecting interlayer (15) and the sealing groove (11), a collecting hole (16) is provided on the lower side wall of the collecting cylinder (12) A discharge hole (17) is provided which is connected to the collecting interlayer (15). A return pipe (18) is provided between the discharge hole (17) and the input end of the inlet check valve. A reversing valve is provided on the reversing pipe (18). The reversing valve is connected to the discharge pipe. An airtight device is provided in the collecting interlayer (15). The airtight device includes an energy storage spring (19) and an airtight piston ring (20). The airtight piston ring (20) is in sealed sliding connection with the collecting cylinder (12) and the mounting cylinder (3). The energy storage spring (19) is provided between the left side of the airtight piston ring (20) and the collecting cylinder (12). The discharge hole (17) is located on the left side of the airtight piston ring (20) and the collecting cylinder (12). ) on the right side, the collecting cylinder (12) is provided with a left air nozzle (21) and a right air nozzle (22), the left air nozzle (21) and the right air nozzle (22) are respectively located on the left and right sides of the airtight piston ring (20), and an air pump is fixedly installed above the collecting cylinder (12), the air pump includes an air cylinder and an air pumping rod, and the air cylinder is provided with a one-way air inlet (23) and a one-way air outlet (24), the one-way air inlet (23) and the one-way air outlet (24) are respectively connected to the left air nozzle (21) and the right air nozzle (22) through an air pipe, and the outer end of the air pumping rod is fixedly connected to a damping slip ring (25), and the damping slip ring (25) is connected to the plunger (2) in a damping sliding manner.

2. The easily replaceable plunger metering pump according to claim 1, characterized in that: The damping slip ring (25) is provided with a fastening screw (26) for fixing the connecting plunger (2).

3. The easily replaceable plunger metering pump according to claim 1, characterized in that: A third sealing ring (27) for sealingly connecting the mounting cylinder (3) is fixedly mounted on the pressure plate (7).

4. The easily replaceable plunger metering pump according to claim 1, characterized in that: The two ends of the compression spring (6) are fixedly connected to the pressure ring (5) and the pressure plate (7) respectively.

5. The easily replaceable plunger metering pump according to claim 1, characterized in that: The pressure ring (5) has a conical expansion sleeve opening (28) at one end facing the filler (4).

6. The easily replaceable plunger metering pump according to claim 1, characterized in that: An elastic anti-loosening pad (29), a preload spring (30) and an elastic sealing pad (31) are provided between the adjusting screw (9) and the sealing cover (8).

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