Long-axis deep-well pump packing type seal self-compensation and abrasion monitoring device

Abstract

The utility model relates to the technical field of long-shaft deep-well pumps, in particular to a long-shaft deep-well pump packing type sealing self-compensation and abrasion monitoring device which comprises a data acquisition device, an alarm device, a gland, a sealing structure and a positioning shaft sleeve, the sealing structure is composed of a plurality of layers of rotary sealing pieces which are kept in the circumferential direction of the pump shaft through tension springs, the data acquisition device is configured to obtain the number of rotation turns of the pump shaft, and the alarm device is electrically connected with the data acquisition device. By adjusting the number of layers of the rotary sealing piece and the length of the tension spring, the rotary sealing piece is kept in the circumferential direction of the pump shaft through the tension spring, and the tension spring provides holding force, so that the effect of automatically compensating the rotary sealing piece in the radial direction can be achieved, and the water injection amount of the water pump is within a reasonable range; by recording the number of rotation turns of the pump shaft, the abrasion degree of the rotary sealing piece can be determined according to the number of turns, the alarm device is triggered to give an alarm, and shaft seal abrasion monitoring is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of long - shaft deep - well pumps, and more specifically, to a stuffing - box type seal self - compensation and wear monitoring device for a long - shaft deep - well pump. Background Technique

[0002] The shaft seal is a sealing device between the pump shaft and the pump casing. During the operation of the water pump, the liquid will leak out from the gap between the rotating pump shaft and the pump casing. The leakage will reduce the operation efficiency of the pump, pollute the environment and even cause serious equipment failures. Therefore, the shaft seal is required to block the leaked liquid.

[0003] See Figure 4 As shown, the commonly used shaft seal form in hydropower stations at present is the stuffing - box type seal, which includes a stuffing box 1, a stuffing sleeve 2, a stuffing seal 3, a gasket 4 and a first gland 5. The stuffing box and the gland are at both ends of the stuffing seal, playing a role in pressing the stuffing seal. The tightness of the stuffing seal can be adjusted by a compression nut, which is an important guarantee for sealing the pump shaft.

[0004] However, for this shaft seal form, since the stuffing seal materials are mostly hemp packing and water - based packing, the wear resistance is poor and the service life is short. After exceeding the designed wear amount, it will be difficult to seal the axial incoming water, and it cannot be reused, and the worn packing needs to be replaced. In addition, when the existing shaft seal structure has a water - leakage defect, it is difficult to detect. When it is detected, it usually has leaked water for a long time, which is easy to cause water accumulation inside the pump body, affecting the safety of the equipment and the surrounding environment. Content of the Utility Model

[0005] The purpose of the utility model is to provide a stuffing - box type seal self - compensation and wear monitoring device for a long - shaft deep - well pump. A tension spring is used to hold the rotating seal member circumferentially around the pump shaft, and the holding force is provided by the tension spring, which can achieve the effect of radial automatic compensation for the rotating seal member, so that the water leakage amount of the water pump is within a reasonable range. In addition, by recording the number of rotations of the pump shaft, the wear degree of the rotating seal member can be determined through the number of rotations, so as to solve the technical problems that the existing shaft seal structure is easy to wear, fails after exceeding the designed wear amount and it is difficult to find the water - leakage defect.

[0006] The embodiment of the utility model is realized by the following technical solutions: A stuffing - box type seal self - compensation and wear monitoring device for a long - shaft deep - well pump, including a data acquisition device, an alarm device, and a gland, a sealing structure and a positioning bushing that are sequentially sleeved on the pump shaft. The sealing structure is composed of several layers of rotating seal members held circumferentially around the pump shaft by tension springs. The data acquisition device is configured to obtain the number of rotations of the pump shaft, and the alarm device is electrically connected to the data acquisition device.

[0007] According to a preferred embodiment, the rotary seal is composed of a sealing ring, a frame and a tension spring, the sealing ring is provided with a first annular groove and a second annular groove along its circumference, the tension spring is arranged in the first annular groove, and the frame is arranged in the second annular groove.

[0008] According to a preferred embodiment, the first annular groove is located inside the second annular groove.

[0009] According to a preferred embodiment, the sealing ring is made of wear-resistant material.

[0010] According to a preferred embodiment, a positioning pin hole is provided on the positioning sleeve along its circumference, and a third annular groove is provided on the inner wall of the positioning sleeve.

[0011] According to a preferred embodiment, the positioning sleeve is made of engineering plastic material.

[0012] According to a preferred embodiment, the sealing structure and the positioning sleeve are designed as one piece.

[0013] According to a preferred embodiment, the sealing structure and the positioning sleeve are designed to be separated.

[0014] According to a preferred embodiment, the data acquisition device is composed of a support frame and a Hall sensor, the support frame is arranged on the upper end of the pressure cover, and the Hall sensor is arranged on the support frame.

[0015] According to a preferred embodiment, the Hall sensor is electrically connected to the alarm device via a data transmission line.

[0016] The technical solution of a long-shaft deep-well pump packing seal self-compensation and wear monitoring device provided by the embodiment of the utility model has at least the following advantages and beneficial effects: (1) by adjusting the number of layers of the rotating seal and the length of the tension spring, the rotating seal is maintained in the circumferential direction of the pump shaft by the tension spring, and the clamping force is provided by the tension spring, so that the radial automatic compensation effect of the rotating seal can be achieved, so that the water penetration volume of the water pump is within a reasonable range; (2) by recording the number of rotations of the pump shaft, the degree of wear of the rotating seal can be determined by the number of rotations, and when the number of rotations reaches the shaft seal wear alarm value, the alarm device is triggered to alarm, thereby realizing the shaft seal wear monitoring function. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a long-shaft deep-well pump packing seal self-compensation and wear monitoring device provided in Example 1 of the utility model;

[0018] Figure 2 A schematic diagram of the structure of a rotary seal provided in Example 2 of the utility model;

[0019] Figure 3Schematic structural diagram of the bushing provided in Embodiment 3 of the present utility model;

[0020] Figure 4 Schematic diagram of a stuffing box seal of the prior art;

[0021] Reference numerals: 1 - gland, 2 - sealing structure, 201 - tension spring, 202 - skeleton, 203 - sealing ring, 2031 - first annular groove, 2032 - second annular groove, 3 - positioning bushing, 301 - positioning pin hole, 302 - third annular groove, 4 - data acquisition device, 401 - support frame, 402 - Hall sensor. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0023] Embodiment 1

[0024] Figure 1 Schematic structural diagram of the first preferred embodiment of a stuffing box seal self - compensation and wear monitoring device for a long - shaft deep - well pump of the present utility model. As Figure 1 shown, the stuffing box seal self - compensation and wear monitoring device for a long - shaft deep - well pump includes a data acquisition device 4, an alarm device, and a gland 1, a sealing structure 2, and a positioning bushing 3 that are sequentially sleeved on the pump shaft.

[0025] In one implementation manner of this embodiment, the sealing structure 2 and the positioning bushing 3 are designed in a split - type, and in addition, they can also be designed in an integral - type, and no specific limitation is made here.

[0026] Among them, the sealing structure 2 is composed of several layers of rotary seals held in the circumferential direction of the pump shaft by a tension spring 201. The tension spring 201 provides a holding force for the rotary seals, and the effect of radial automatic compensation for the rotary seals can be achieved, so that the water leakage of the water pump is within a reasonable range.

[0027] The specific number of installation layers of the rotary seals can be adjusted according to the actual water leakage situation, and no specific limitation is made here; during operation and debugging, the water leakage of the water pump can be designed by adjusting the length of the tension spring 201 and the number of layers of the rotary seals.

[0028] The data acquisition device 4 is configured to obtain the number of rotation cycles of the pump shaft, and the alarm device is electrically connected to the data acquisition device 4.

[0029] It should be noted that by recording the number of rotations of the pump shaft when water leakage first occurs in the shaft seal, that is, the number of rotations of the pump shaft when the seal fails, this value can be used as the shaft seal wear alarm value. During the operation of the equipment, when the number of rotations of the pump shaft collected by the data acquisition device 4 reaches the shaft seal wear alarm value, the alarm device can be triggered to give an alarm, reminding the staff to stop the pump for maintenance.

[0030] Embodiment 2

[0031] Based on the technical solution provided in Embodiment 1, this embodiment further describes the structure of the rotary seal:

[0032] See Figure 2 As shown, the rotary seal is composed of a sealing ring 203, a skeleton 202 and a tension spring 201. The sealing ring 203 is made of wear-resistant material, such as wear-resistant rubber; a first annular groove 2031 and a second annular groove 2032 are formed along the circumferential direction of the sealing ring 203. In a preferred implementation manner of this embodiment, the first annular groove 2031 is located inside the second annular groove 2032; the tension spring 201 is arranged in the first annular groove 2031 and is used to provide a clamping force for the sealing ring 203, and the skeleton 202 is arranged in the second annular groove 2032 and is used to support the sealing ring 203 into a ring shape.

[0033] Embodiment 3

[0034] Based on the technical solution provided in Embodiment 1, this embodiment further describes the structure of the positioning shaft sleeve 3:

[0035] See Figure 3 As shown, the positioning shaft sleeve 3 is made of engineering plastic material, such as polyether ether ketone; positioning pin holes 301 are formed along the circumferential direction of the positioning shaft sleeve 3, and the positioning pin holes 301 are used to connect two semi-circular positioning shaft sleeves 3 together to improve the flatness of the bottom of the sealing structure 2; a third annular groove 302 is formed on the inner wall of the positioning shaft sleeve 3 to adapt to the outer shape of the pump shaft and realize the disassembly and assembly of the positioning shaft sleeve 3.

[0036] Embodiment 4

[0037] Based on the technical solution provided in Embodiment 1, this embodiment further describes the structure of the data acquisition device 4:

[0038] The data acquisition device 4 is composed of a support frame 401 and a Hall sensor 402. The support frame 401 is arranged at the upper end of the gland 1, and the Hall sensor 402 is arranged on the support frame 401 with its acquisition end facing the pump shaft. By measuring the induction positioning point on the pump shaft with the Hall sensor 402, the number of rotation cycles of the pump shaft can be obtained. Further, the Hall sensor 402 is electrically connected to the alarm device through a data transmission line for uploading the number of rotation cycles data of the pump shaft. The alarm device is configured to display a real-time value and a limit value. The real-time value is the number of rotation cycles of the pump shaft, and the limit value is the shaft seal wear alarm value. By observing the alarm device, the wear degree of the rotary seal can be determined.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A stuffing box type sealing self-compensation and wear monitoring device for a long-axis deep well pump, characterized in that, It includes a data acquisition device (4), an alarm device, and a gland (1), a sealing structure (2), and a positioning bushing (3) that are sequentially sleeved on the pump shaft. The sealing structure (2) is composed of several rotating seals that are held in the circumferential direction of the pump shaft by tension springs (201). The data acquisition device (4) is configured to obtain the number of rotations of the pump shaft, and the alarm device is electrically connected to the data acquisition device (4).

2. The stuffing box seal self-compensation and wear monitoring device for the long-axis deep well pump according to claim 1, wherein, The rotating seal is composed of a sealing ring (203), a skeleton (202), and a tension spring (201). A first annular groove (2031) and a second annular groove (2032) are formed in the circumferential direction of the sealing ring (203). The tension spring (201) is arranged in the first annular groove (2031), and the skeleton (202) is arranged in the second annular groove (2032).

3. The stuffing box type seal self-compensation and wear monitoring device for the long-shaft deep well pump according to claim 2, characterized in that, The first annular groove (2031) is located inside the second annular groove (2032).

4. The long-axis deep-well pump stuffing box seal self-compensation and wear monitoring device according to claim 2, characterized in that, The sealing ring (203) is made of wear-resistant material.

5. The stuffing box seal self-compensation and wear monitoring device for the long-axis deep-well pump according to claim 1, characterized in that A positioning pin hole (301) is formed in the circumferential direction of the positioning bushing (3), and a third annular groove (302) is formed in the inner wall of the positioning bushing (3).

6. The stuffing box type seal self-compensation and wear monitoring device for the long-shaft deep well pump according to claim 1, characterized in that, The positioning bushing (3) is made of engineering plastic material.

7. The long-axis deep-well pump packing type seal self-compensation and wear monitoring device according to any one of claims 1 to 6, characterized in that, The sealing structure (2) and the positioning bushing (3) are integrally designed.

8. The long-axis deep-well pump stuffing box seal self-compensation and wear monitoring device according to any one of claims 1 to 6, characterized in that, The sealing structure (2) and the positioning bushing (3) are separately designed.

9. The stuffing box type seal self-compensation and wear monitoring device for the long-axis deep well pump according to claim 1, characterized in that, The data acquisition device (4) is composed of a support frame (401) and a Hall sensor (402). The support frame (401) is arranged at the upper end of the gland (1), and the Hall sensor (402) is arranged on the support frame (401).

10. The long-axis deep-well pump stuffing box seal self-compensation and wear monitoring device according to claim 9, characterized in that, The Hall sensor (402) is electrically connected to the alarm device through a data transmission line.

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