A sealing device for a pump

Abstract

The utility model discloses a kind of sealing devices for pump, including shell, the inside rotation of shell has pump shaft, the surface installation has, the gland cover is equipped in the outside of pump shaft, graphite ring is equipped on the pump shaft, and the graphite ring is located between gland and shell;The surface of the gland is provided with adjusting mechanism, the adjusting mechanism includes the fixed block being symmetrically arranged on the surface of the shell and being close to the side of the gland, and the outside of the fixed block is equipped with servo motor;Through the pressure sensor signal received by controller, loosen gland when unit operation is automatically adjusted, keep reasonable gap between graphite ring and pump shaft, avoid graphite ring excessive wear and damage due to gap too tight, greatly prolong the service life of graphite ring, reduce replacement frequency and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a sealing device for pumps. Background Technology

[0002] In centrifugal pumps and other equipment, the packing gland is a key component for ensuring the sealing performance of the equipment. Traditional packing glands typically use fabric packing as the sealing material, and the sealing is achieved by manually adjusting the tightness of the gland. However, it is difficult to precisely control the tightness of the gland by manually adjusting it. If it is adjusted too tightly, the friction between the packing and the shaft will be too great, accelerating the wear of the packing and shortening its service life. If it is adjusted too loosely, a good sealing effect cannot be guaranteed, and air leakage will still occur. In addition, frequent manual adjustments increase the labor intensity of operators, and the adjustment accuracy is not high, making it difficult to meet the requirements of modern industrial production for efficient and stable operation of equipment. Utility Model Content

[0003] To address the above problems, this utility model provides a pump sealing device that is simple in structure and easy to operate.

[0004] The technical solution of this utility model is as follows: a pump sealing device, including a housing, a pump shaft rotating inside the housing, a pressure cap installed on the surface of the housing, the pressure cap being sleeved on the outside of the pump shaft, a graphite ring being sleeved on the pump shaft, and the graphite ring being located between the pressure cap and the housing;

[0005] The surface of the pressure cap is provided with an adjustment mechanism;

[0006] The adjustment mechanism includes fixed blocks symmetrically arranged on the surface of the housing and close to the pressure cover. A servo motor is mounted on the outside of the fixed blocks. The output end of the servo motor is connected to a lead screw, which rotates inside the housing. A sliding seat is screwed onto the surface of the lead screw, and the sliding seat slides inside the housing. One side of the sliding seat is connected to the pressure cover.

[0007] A screw is connected to the surface of the sliding seat, and a circular groove is opened on the side of the pressure cover near the screw. A nut is screwed onto the surface of the screw, and the sliding seat is connected to the pressure cover through the nut and the screw.

[0008] The pressure cap surface has an insertion groove that matches the sliding seat on the side near the sliding seat.

[0009] A pressure sensor is installed inside the gland, near the graphite ring.

[0010] The inner wall of the graphite ring is provided with a wear-resistant coating.

[0011] In operation, this invention automatically adjusts the pressure cap to loosen during unit operation, maintaining a reasonable gap between the graphite ring and the pump shaft. This prevents excessive wear and damage to the graphite ring caused by an excessively tight gap, greatly extending the service life of the graphite ring and reducing replacement frequency and maintenance costs. Furthermore, the pressure cap tightness is automatically adjusted via an adjustment mechanism and controller, eliminating the need for manual adjustment and reducing the workload of operators while improving the automation level and reliability of the equipment.

[0012] This invention uses graphite rings as sealing material, which have better sealing performance than traditional fabric packing. Combined with the adjustment mechanism that drives the automatic tightening function of the pressure cap, it can effectively prevent air leakage when the centrifugal pump starts, ensuring the normal operation of the equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 In this utility model Figure 1 Enlarged view of point A in the middle;

[0015] Figure 3 This is a cross-sectional view of the pressure cap in this utility model;

[0016] Figure 4 This is a schematic diagram of the sliding seat and screw in this utility model;

[0017] In the diagram: 1. Housing; 2. Pressure cap; 3. Adjustment mechanism; 31. Servo motor; 32. Fixing block; 33. Lead screw; 34. Sliding seat; 35. Nut; 36. Screw; 37. Insertion groove; 38. Pressure sensor; 4. Graphite ring; 5. Pump shaft. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figure 1-4As shown, this utility model provides a pump sealing device, including a housing 1, a pump shaft 5 rotatably mounted inside the housing 1, a pressure cap 2 mounted on the surface of the housing 1, the pressure cap 2 being sleeved on the outside of the pump shaft 5, and a graphite ring 4 being sleeved on the pump shaft 5, the graphite ring 4 being located between the pressure cap 2 and the housing 1; in application, the housing 1 is provided with a receiving groove, and the graphite ring is located in the receiving groove; the housing 1 is provided with a through hole for the pump shaft, the through hole communicating with the receiving groove. An adjustment mechanism 3 is provided on the surface of the pressure cap 2;

[0020] The adjusting mechanism 3 includes fixed blocks 32 symmetrically arranged on the surface of the housing 1 near the pressure cap 2. A servo motor 31 is mounted on the outside of the fixed blocks 32. The output end of the servo motor 31 is connected to a lead screw 33, which rotates inside the housing 1. A sliding seat 34 is screwed onto the surface of the lead screw 33, and the sliding seat 34 slides inside the housing 1. One side of the sliding seat 34 is connected to the pressure cap 2. When the centrifugal pump starts, the controller controls the servo motor 31 to start, and then the servo motor 31 drives the lead screw 33 to rotate, causing the sliding seat 34 and the pressure cap 2 to move, so that the graphite ring 4 is in close contact with the pump shaft 5, achieving shaft sealing and completing the initial sealing adjustment to prevent air leakage. When the unit is running normally, the controller immediately controls the servo motor 31 to reverse, driving the sliding seat 34 and the pressure cap 2 to move an appropriate distance away from the pump shaft 5, avoiding damage to the graphite ring 4 due to excessive compression. This utility model improves reliability through graphite ring sealing.

[0021] The sliding seat 34 is connected to a screw 36. A circular groove is opened on the side of the cover 2 near the screw 36. A nut 35 is screwed onto the surface of the screw 36. The sliding seat 34 is connected to the cover 2 through the nut 35 and the screw 36. The cover 2 can be disassembled by loosening the nut 35, which facilitates the replacement of the cover 2 and the graphite ring 4.

[0022] The pressure cap 2 has an insertion groove 37 on the side near the sliding seat 34 that matches the sliding seat 34. When the pressure cap 2 is installed by tightening the nut 35, the sliding seat 34 slides into the insertion groove 37, which limits the position of the pressure cap 2, improves the stability of the installation of the pressure cap 2, and ensures the connection effect between the sliding seat 34 and the pressure cap 2.

[0023] A pressure sensor 38 is installed inside the gland 2 near the graphite ring 4. The pressure sensor 38 can monitor the pressure data of the graphite ring 4 in real time, thus reflecting the sealing pressure between the graphite ring 4 and the pump shaft 5. In application, the pressure sensor is connected to a controller, which controls the servo motor's movement, a standard practice in this field.

[0024] The inner wall of the graphite ring 4 is coated with a wear-resistant coating to improve its service life. In application, the wear-resistant coating can be either a PTFE coating or a silicone coating.

[0025] In operation, when the centrifugal pump starts, the controller controls the servo motor 31 to start. The servo motor 31 then drives the lead screw 33 to rotate, causing the sliding seat 34 and the pressure cap 2 to move downwards, compressing the graphite ring 4 and making it tightly contact the pump shaft 5. At the same time, the pressure sensor 38 can monitor the pressure data of the graphite ring 4 in real time. When the pressure reaches the preset sealing pressure threshold for the start-up stage, the controller controls the servo motor 31 to stop rotating, completing the initial sealing adjustment and preventing air leakage. When the unit is running normally, if the pressure monitored by the pressure sensor 38 exceeds the preset safe pressure threshold for the unit operation stage, the controller immediately controls the servo motor 31 to reverse, driving the sliding seat 34 and the pressure cap 2 to move an appropriate distance away from the pump shaft 5 until the pressure drops to within the safe threshold range, preventing the graphite ring 4 from being damaged due to excessive compression.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pump sealing device, comprising a housing (1), wherein a pump shaft (5) is rotatably mounted inside the housing (1), characterized in that: A pressure cap (2) is installed on the surface of the housing (1). The pressure cap (2) is sleeved on the outside of the pump shaft (5). A graphite ring (4) is sleeved on the pump shaft (5). The graphite ring (4) is located between the pressure cap (2) and the housing (1). The surface of the pressure cap (2) is provided with an adjustment mechanism (3); The adjustment mechanism (3) includes a fixing block (32) symmetrically arranged on the surface of the housing (1) and close to the pressure cover (2). A servo motor (31) is installed on the outside of the fixing block (32). The output end of the servo motor (31) is connected to a lead screw (33), and the lead screw (33) rotates inside the housing (1). A sliding seat (34) is screwed onto the surface of the lead screw (33), and the sliding seat (34) slides inside the housing (1). One side of the sliding seat (34) is connected to the pressure cover (2).

2. The pump sealing device according to claim 1, characterized in that: The surface of the sliding seat (34) is connected to a screw (36), and a circular groove is opened on the side of the pressure cover (2) near the screw (36). A nut (35) is screwed onto the surface of the screw (36), and the sliding seat (34) is connected to the pressure cover (2) through the nut (35) and the screw (36).

3. A pump sealing device according to claim 2, characterized in that: The pressure cap (2) has an insertion groove (37) that matches the sliding seat (34) on the side of its surface near the sliding seat (34).

4. A pump sealing device according to claim 1, characterized in that: A pressure sensor (38) is installed inside the pressure cap (2) on the side near the graphite ring (4).

5. A pump sealing device according to claim 1, characterized in that: The inner wall of the graphite ring (4) is provided with a wear-resistant coating.

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