A quick-change sealing device for a plunger pump and a plunger pump

Abstract

The present invention discloses a quick-change sealing device for a plunger pump and a plunger pump, comprising a sealing sleeve installed on a plunger, a sealing flange sleeved on the sealing sleeve, a clamping device installed at the front end of the sealing sleeve, the sealing sleeve being fixed to the sealing flange through the clamping device, the sealing flange being fixedly installed in a frame hole, and the end thereof being in contact with a hydraulic cylinder. By improving the positioning type of the pump head, the sealing flange and the frame, sufficient layout space is reserved for the quick-change plunger sealing system, so that the entire plunger and the sealing assembly can be taken out from the pump head without any disassembly of the hydraulic end, thereby achieving the purpose of quick replacement, reliable locking, and saving replacement time, greatly improving the grouting efficiency, and reducing the operating cost.

Description

Technical Field

[0001] The invention relates to the technical field of plunger type reciprocating pump equipment, and in particular to a quick-change sealing device for a plunger pump and a plunger pump. Background Art

[0002] At present, the traditional grouting pump widely uses a pump type equipped with a plunger structure in the hydraulic end design. The seal adopts the traditional V-shaped seal ring, which leads to frequent damage of the seal at the grouting site and the seal leakage or plunger wear. The pump head must be disassembled for replacement. Disassembly of the plunger and seal assembly is time-consuming and labor-intensive, with high operating costs. In addition, the machine must be shut down during disassembly, which wastes time and reduces work efficiency. Summary of the invention

[0003] In view of the above-mentioned defects or shortcomings, the purpose of the present invention is to provide a quick-change sealing device and a plunger pump for a plunger pump, which enhances the service life of the plunger and the sealing assembly, eliminates the need to disassemble the pump head, reduces downtime, improves grouting efficiency, reduces labor intensity, and reduces operating costs.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A quick-change sealing device for a plunger pump comprises a sealing sleeve installed on a plunger, a sealing flange is sleeved on the sealing sleeve, a clamping device is installed at the front end of the sealing sleeve, the sealing sleeve is fixed to the sealing flange through the clamping device, the sealing flange is fixedly installed in a frame hole, and the end thereof is in contact with a hydraulic cylinder.

[0006] The clamping device comprises a clamping nut installed at the front end of the sealing sleeve, a clamping plate is arranged outside the clamping nut, and the clamping plate is fixedly installed on the outer wall of the sealing flange to prevent the clamping nut from loosening.

[0007] The sealing flange is mounted on the frame by means of sealing flange screws.

[0008] The end of the sealing flange is installed with a first O-ring and an O-ring.

[0009] Packing is installed in the sealing sleeve.

[0010] A dustproof sealing ring and a sealing ring are installed in the sealing sleeve.

[0011] A second O-ring is installed between the sealing sleeve and the sealing flange.

[0012] A plunger pump comprises a plunger, on which a quick-change sealing device for a plunger pump as described in any one of the claims is mounted, the front end of the plunger is connected to a tappet via a ferrule assembly, the rear end of the plunger is installed in a hydraulic cylinder, and a suction cover and a pressure cover are installed on the hydraulic cylinder.

[0013] The hydraulic cylinder is installed on the frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The present invention provides a quick-change sealing device for a plunger pump and a plunger pump. By improving the pump head, the sealing flange and the frame positioning type, the hydraulic cylinder is directly installed on the frame, leaving sufficient layout space for the quick-change plunger sealing system, and the sealing device can be directly fixed on the frame, so that the entire plunger and the sealing assembly can be taken out from the pump head without any disassembly of the hydraulic end, so as to achieve the purpose of fast replacement, reliable locking, and saving replacement time, greatly improve the grouting efficiency, and reduce the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a quick-change sealing device of the present invention for a plunger pump;

[0017] Figure 2 It is a schematic diagram of the structure of the plunger pump of the present invention;

[0018] Figure 3 This is a state diagram of the plunger replacement of the present invention;

[0019] Figure 4 It is a state diagram of the sealing sleeve replacement of the present invention.

[0020] In the figure, 1 is a clamping nut; 2 is a clamping plate; 3 is a screw; 4 is a dustproof sealing ring; 5 is a sealing ring; 6 is an O-ring; 7 is a sealing flange; 8 is a sealing sleeve; 9 is a packing; 10 is an O-ring; 11 is an O-ring; 12 is a plunger; 13 is a push rod; 14 is a ferrule assembly; 15 is a pressure cover; 16 is a pressure cover stud; 17 is a suction cover; 18 is a sealing flange screw; 19 is a frame; 20 is a hydraulic cylinder. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0022] The existing quick-change sealing device of the plunger pump is installed between the frame and the hydraulic cylinder, and the obtained sealing device is connected to the frame and the hydraulic cylinder. Therefore, when the sealing device needs to be replaced, it is necessary to remove the ferrule, unscrew the compression nut, remove the gland, and use special tools to pull out the plug cover and valve assembly in sequence. Remove the suction cover bolts, pull out the gland and suction cover in sequence, and then use special tools to pull the plunger out of the hole of the cylinder cover, and then remove the cylinder body bolts, remove the cylinder body, and then replace the stuffing box, stuffing box end face seal and stuffing, making the entire replacement process very cumbersome. In order to solve this problem, the present invention provides a quick-change sealing device for a plunger pump;

[0023] like Figure 1-2 As shown, it includes a sealing sleeve 8 installed on the plunger 12, a sealing flange 7 is mounted on the sealing sleeve 8, a clamping device is installed at the front end of the sealing sleeve 8, the sealing sleeve 8 is fixed to the sealing flange 7 through the clamping device, and the sealing flange 7 is fixedly installed in the frame hole, and the end is in contact with the hydraulic cylinder 20.

[0024] The cylinder is positioned directly on the frame, and the entire plunger seal assembly is positioned in the frame hole with a sealing flange and fixed to the frame with four screws on the end face. When disassembling, you only need to remove the four screws and the suction cover on the end face of the pump head to remove the plunger and seal assembly from the inner hole of the pump head, without having to disassemble any other parts of the hydraulic end.

[0025] Specifically, the clamping device of the present invention includes a clamping nut 1 installed at the front end of the sealing sleeve 8, and a clamping plate 2 is arranged outside the clamping nut 1. The clamping plate 2 is fixedly installed on the outer wall of the sealing flange 7. The clamping plate 2 can clamp the clamping nut 1 to prevent the clamping nut 1 from loosening, thereby ensuring the sealing of the entire device.

[0026] In addition, in order to install the entire quick-change sealing device on the plunger 12, the sealing flange 7 is fixedly installed on the frame 19 through the frame hole by the sealing flange screw 18 in the present invention to prevent the entire device from falling off. Since the sealing sleeve 8 and the sealing flange 7 are separable and independent, the quick-change sealing device can also be directly removed from the front end of the frame 19 without disassembling the hydraulic pump 20.

[0027] The entire device requires high sealing performance, so the first O-ring 10 and the O-ring 11 are installed at the end of the sealing flange 7; the packing 9 is installed in the sealing sleeve 8, which can better adapt to the medium such as cement slurry and play a better sealing effect, and the dustproof sealing ring 4 and the sealing ring 5 are installed in the sealing sleeve 8; the second O-ring 6 is installed between the sealing sleeve 8 and the sealing flange 7. Multiple sealing rings can ensure that the sealing performance between the quick-change sealing device and the plunger 12 is more reliable.

[0028] like Figure 2As shown, in the present invention, a plunger pump is also provided, including a plunger 12, on which a quick-change sealing device for the plunger pump is mounted, and the quick-change sealing device for the plunger pump is the quick-change sealing device mentioned above, and in addition, the front end of the plunger 12 is connected to the tappet 13 through a ferrule assembly 14, and the rear end of the plunger 12 is installed in a hydraulic cylinder 20, and a suction cover 17 and a pressure cover 15 are installed on the hydraulic cylinder 20. The hydraulic cylinder 13 is mounted on a frame 19.

[0029] The working principle of the present invention is:

[0030] The pump head is directly positioned on the frame, leaving space for the quick-change plunger seal system. The entire plunger seal assembly is reliably positioned in the frame with the pump head, ensuring the installation accuracy of the plunger and seal assembly for repeated installation. The UN seal has a better sealing effect and is more convenient to replace.

[0031] The specific working process is:

[0032] like Figure 3 When the plunger needs to be replaced:

[0033] First, disassemble the ferrule assembly 14, remove the disassembly screw 3, remove the clamping plate 2, unscrew the clamping nut 4, remove the gland bolt 12, remove the gland 15, take out the suction cover 17 and push out the plunger 12 with a special tool.

[0034] like Figure 4 Replace the quick-change seal as shown:

[0035] First, remove the plunger 12 according to the above steps, remove the gland bolt 12, remove the gland 12 and the suction cover 13, and then use a special tool to push out the sealing sleeve 7 and replace the sealing sleeve 8.

[0036] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, the improvements and changes 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 purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. A quick-change sealing device for a plunger pump, characterized in that: The invention comprises a sealing sleeve (8) mounted on a plunger (12), a sealing flange (7) being sleeved on the sealing sleeve (8), a clamping device being mounted on the front end of the sealing sleeve (8), the sealing sleeve (8) being fixed to the sealing flange (7) through the clamping device, the sealing flange (7) being fixedly mounted in a frame hole, and the end of the sealing flange (7) being in contact with a hydraulic cylinder (20); the clamping device comprising a clamping nut (1) mounted on the front end of the sealing sleeve (8), a clamping plate (2) being arranged outside the clamping nut (1), the clamping plate (2) being fixedly mounted on the outer wall of the sealing flange (7) to prevent the clamping nut (1) from loosening; the sealing flange (7) being mounted on the frame (19) through a sealing flange screw (18); and a packing (9) being mounted inside the sealing sleeve (8); When it is time to replace the plunger: First, disassemble the ferrule assembly (14), remove the disassembly screw (3), remove the clamping plate (2), unscrew the clamping nut (1), remove the gland stud (16), remove the gland (15), take out the suction cover (17), and use a special tool to push out the plunger (12); To replace the quick-change seal: First, remove the plunger (12) according to the above steps, remove the gland stud (16), remove the gland (15) and the suction cover (17), then use a special tool to push out the sealing sleeve (8) and replace the sealing sleeve (8).

2. The quick-change sealing device for a plunger pump according to claim 1, characterized in that: A first O-ring (10) and an O-ring (11) are installed at the end of the sealing flange (7).

3. The quick-change sealing device for a plunger pump according to claim 1, characterized in that: A dustproof sealing ring (4) and a sealing ring (5) are installed in the sealing sleeve (8).

4. The quick-change sealing device for a plunger pump according to claim 1, characterized in that: A second O-ring (6) is installed between the sealing sleeve (8) and the sealing flange (7).

5. A plunger pump, characterized in that: The invention comprises a plunger (12), on which a quick-change sealing device for a plunger pump as claimed in any one of claims 1 to 4 is mounted, the front end of the plunger (12) is connected to a tappet (13) via a ferrule assembly (14), the rear end of the plunger (12) is installed in a hydraulic cylinder (20), and a suction cover (17) and a pressure cover (15) are installed on the hydraulic cylinder (20).

6. The plunger pump according to claim 5, characterized in that The hydraulic cylinder (20) is installed on the frame (19).

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