Mechanical sealing device of screw pump

Abstract

The mechanical sealing device of the screw pump comprises an extension shaft sleeve, a movable ring and a static ring, the extension shaft sleeve is integrally formed by a shaft sleeve and an extension head, one end of the movable ring is detachably installed on a movable ring seat, the other end of the movable ring is connected with one end of the static ring, and the other end of the static ring is detachably installed on a static ring seat. The movable ring seat is detachably installed on the shaft sleeve, the static ring seat is detachably installed on the suspension, the movable ring seat is connected with the shaft sleeve through a jackscrew, a positioning device is arranged between the extension head and the movable ring seat, a groove is formed in the static ring seat, and at least two sealing mechanisms are arranged between the groove and the shaft sleeve. The problem of leakage caused by abrasion of a mechanical seal is solved, the shutdown frequency of the screw pump is reduced through the positioning mechanism and the sealing mechanism, the operation time of equipment is prolonged, and the utilization rate of the equipment is increased.

Description

Technical Field

[0001] The utility model relates to the field of chemical machinery and equipment, in particular to a mechanical sealing device for a screw pump. Background Art

[0002] A screw pump is a pump that uses the motion of a screw to propel liquid flow. It boasts high efficiency, good stability, and a large delivery capacity. It is suitable for conveying high-viscosity liquids and liquids containing solid particles. It consists of a screw, pump body, and inlet and outlet pipes. The screw of a screw pump typically has multiple thread grooves. As the screw rotates, the liquid is pushed toward the outlet. During operation, vibrations can loosen the top screw of the mechanical seal's dynamic ring seat, causing the dynamic ring seat to shift toward the extension head. This can lead to insufficient seal compression and leakage of the conveying medium through the mating surface of the dynamic and static seals into the seal cooling water, contaminating the seal cooling water. Furthermore, since the seal cooling water is recycled, slurry particles leaking into the seal cooling water can accelerate wear of the dynamic and static seals, causing more severe mechanical seal leakage.

[0003] The screw pump mechanical seal static ring seat and the air have a single oil seal. The vibration of the screw pump during operation will make the oil seal not tight enough. In addition, the single oil seal has insufficient pressure resistance, resulting in leakage of mechanical seal cooling water at the oil seal seal, causing mechanical seal cooling water leakage, polluting the on-site environment, increasing labor force, and long maintenance time, which will cause normal feeding to be delayed and affect output. When the static ring seat is dismantled for long-term maintenance, the shaft or reducer needs to be replaced, resulting in the consumption of equipment spare parts.

[0004] The existing Chinese utility model patent publication number CN202612197U, "Mechanical Sealing Device for Sanitary Pumps," includes a shaft sleeve, a dynamic ring seat, a sealing dynamic ring, a sealing static ring, a static ring seat, a gland, and a wave spring. The dynamic ring seat is sleeved on the shaft sleeve, the static ring seat is mounted on the gland, and the wave spring is mounted within the dynamic ring seat. The dynamic ring seat and the sealing dynamic ring are tightly fitted and sealed, and the sealing static ring and the static ring seat are also tightly fitted and sealed. This sealing device has a long service life and good sealing reliability. However, in the aforementioned patent, a placement groove is provided to mainly fix the dynamic ring, and the displacement of the dynamic ring seat cannot be fixed.

[0005] The existing Chinese utility model patent with publication number CN202867326U discloses "A mechanical sealing device for a pump", which includes a shaft body, a dynamic ring and a dynamic ring seat sleeved on the shaft body, and a static ring and a static ring seat sleeved on the pump. The dynamic ring seat is connected to the shaft body through a threaded structure, and the dynamic ring is embedded in the dynamic ring seat. The static ring installed in the static ring seat is in sealing contact with the dynamic ring. Anti-rotation pins are used to connect the dynamic ring and the dynamic ring seat, as well as the static ring and the static ring seat. The utility model prevents the dynamic ring and the static ring from rotating relative to each other in various mounting seats, ensuring good sealing of the pump body. However, in the aforementioned patent, a rotation pin is used to prevent the dynamic ring seat from rotating on the shaft. The dynamic ring seat will undergo axial displacement under vibration, and the joint surface between the dynamic ring and the static ring will not be tight enough, resulting in poor sealing. Summary of the Invention

[0006] The purpose of the utility model is to solve the problem of leakage caused by mechanical seal wear during the operation of the screw pump, reduce the shutdown frequency of the screw pump, extend the operating time of the equipment, and improve the utilization rate of the equipment through a positioning device and a sealing mechanism.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a mechanical sealing device of a screw pump, comprising an extended shaft sleeve, a dynamic ring, and a static ring, the extended shaft sleeve comprising a shaft sleeve and an extension head, one end of the dynamic ring is detachably mounted on the dynamic ring seat, and the other end is connected to one end of the static ring, the other end of the static ring is detachably mounted on the static ring seat, the dynamic ring seat is detachably mounted on the shaft sleeve, and the static ring seat is detachably mounted on the suspension, the dynamic ring seat is connected to the shaft sleeve by a top screw, the dynamic ring and the static ring are sleeved on the shaft sleeve, a positioning device is provided between the extension head and the dynamic ring seat, a groove is provided inside the static ring seat, and a sealing mechanism is provided between the groove and the shaft sleeve.

[0008] Furthermore, the positioning device is in the shape of a ring, is mounted on the shaft sleeve, and is made of metal, preferably stainless steel, which is not easily deformed or worn, and has a positioning function for the movable ring seat, preventing the movable ring seat from shifting and causing material leakage.

[0009] Furthermore, the thickness of the positioning device is equal to the distance between the extension head and the dynamic ring seat. The positioning device is used to prevent the dynamic ring seat from axially shifting after the top screw is loosened. The length of the positioning device is equal to the distance between the extension head and the dynamic ring seat, thereby locating the dynamic ring seat.

[0010] Furthermore, the sealing mechanism is installed in a groove, and the depth of the groove is 12-36 mm.

[0011] Furthermore, the sealing mechanism is preferably a skeleton oil seal. Since the skeleton of the skeleton oil seal is made of metal, it has better sealing performance for liquid and longer service life.

[0012] Furthermore, there are at least two skeleton oil seals. More than two skeleton oil seals increase the pressure resistance and effectively solve the problem of water leakage caused by insufficient strength of a single skeleton oil seal.

[0013] Furthermore, the diameter of the sealing mechanism is the same as the diameter of the groove.

[0014] Furthermore, the stationary ring seat is provided with a cooling water pipe.

[0015] The beneficial effects of the present invention are as follows: a positioning device is provided in the present invention to prevent the dynamic ring seat from deviating toward the extension head, thereby enhancing the sealing performance of the joint surface between the static ring and the dynamic ring and reducing leakage of materials into the cooling water; at least two sealing mechanisms are provided between the groove and the shaft sleeve, thereby reducing leakage of cooling water in the on-site environment, extending the operating time of the screw pump, improving production continuity, reducing the consumption of spare parts, saving production costs, improving the on-site environment, reducing the labor intensity of employees in repairing equipment, and enhancing the pressure resistance of the sealing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the present utility model.

[0017] Figure 2 It is a partial schematic diagram of the utility model.

[0018] Figure 1 and Figure 2 Among them, 1 is the extended sleeve, 2 is the dynamic ring, 3 is the static ring, 4 is the sleeve, 5 is the extended head, 6 is the dynamic ring seat, 7 is the static ring seat, 8 is the suspension, 9 is the top screw, 10 is the positioning device, 11 is the groove, 12 is the sealing mechanism, and 13 is the cooling water pipe. DETAILED DESCRIPTION

[0019] Figure 1 and Figure 2 As shown, it includes an extended sleeve 1, a dynamic ring 2, and a static ring 3. The extended sleeve 1 is formed by a sleeve 4 and an extended head 5. One end of the dynamic ring 2 is detachably mounted on the dynamic ring seat 6, and the other end is connected to one end of the static ring 3. The other end of the static ring 3 is detachably mounted on the static ring seat 7. The dynamic ring seat 6 is detachably mounted on the sleeve 4, and the static ring seat 7 is detachably mounted on the suspension 8. The dynamic ring seat 6 is connected to the sleeve 4 by a top screw 9, and the inner sides of the dynamic ring 2 and the static ring 3 are sleeved on the sleeve 4. A positioning device 10 is provided between the extension head 5 and the dynamic ring seat 6. The positioning device is in a circular ring shape and is made of stainless steel. The length of the positioning device 10 is the distance between the extension head 5 and the dynamic ring seat 6. A groove 11 is provided inside the static ring seat 7. The depth of the groove 11 is 12-36 mm. At least two sealing mechanisms 12 are provided between the groove 11 and the shaft sleeve 4. The sealing mechanism 12 is a skeleton oil seal. The diameter of the sealing mechanism 12 is the same as the diameter of the groove 11. The static ring seat 7 is provided with a cooling water pipe 13.

[0020] Figure 1 and Figure 2 As shown, it includes an extended sleeve 1, a dynamic ring 2, and a static ring 3. The extended sleeve 1 is formed by a sleeve 4 and an extended head 5. One end of the dynamic ring 2 is detachably mounted on the dynamic ring seat 6, and the other end is connected to one end of the static ring 3. The other end of the static ring 3 is detachably mounted on the static ring seat 7. The dynamic ring seat 6 is detachably mounted on the sleeve 4, and the static ring seat 7 is detachably mounted on the suspension 8. The dynamic ring seat 6 is connected to the sleeve 4 by a top screw 9. The inner sides of the dynamic ring 2 and the static ring 3 are sleeved on the sleeve 4. A positioning device 10 is provided between the extension head 5 and the dynamic ring seat 6. The positioning device is in a circular ring shape and is made of copper. The length of the positioning device 10 is the distance between the extension head 5 and the dynamic ring seat 6. A groove 11 is provided inside the static ring seat 7. The depth of the groove 11 is 12-36 mm. At least two sealing mechanisms 12 are provided between the groove 11 and the shaft sleeve 4. The sealing mechanism 12 is a labyrinth oil seal. The diameter of the sealing mechanism 12 is the same as the diameter of the groove 11. The static ring seat 7 is provided with a cooling water pipe 13.

[0021] During the operation of the screw pump, the extended sleeve 1 rotates with the shaft of the screw pump, and the static ring seat 7 is installed on the suspension 8. The sleeve 4 does not drive the static ring seat 7 and the static ring 3 to rotate, and the sleeve 4 drives the dynamic ring 2 and the dynamic ring seat 6 to rotate. The vibration of the screw pump will cause the top screw 9 to loosen, causing the dynamic ring seat 6 and the dynamic ring 2 to axially displace toward the extended head 5, so that the joint surface between the dynamic ring 2 and the static ring 3 is not tight enough, and material leakage occurs at the joint surface. After the positioning device 10 is installed on the sleeve 4, the thickness of the positioning device 10 is the distance between the static ring seat 7 and the extended head 5. When the dynamic ring seat 6 rotates with the extended sleeve 1, the top screw 9 connecting the dynamic ring seat 6 and the sleeve 4 is loosened due to vibration, which restricts the dynamic ring The seat 6 and the dynamic ring 2 undergo axial displacement toward the extended head 5, and the sealing performance of the joint surface between the dynamic ring 2 and the static ring 3 will not decrease, and the material will not leak into the cooling water from the joint surface between the dynamic ring 2 and the static ring 3; the static ring seat 7 is provided with a cooling water pipe 13, and the cooling water pipe 13 provides cooling water to the joint surface between the dynamic ring 2 and the static ring 3 for cooling. A groove 11 is provided on the static ring seat 7, and a sealing mechanism 12 is installed in the groove 11 to prevent the cooling water from flowing into the environment. When the material leaks, the sealing strength of the single sealing mechanism 12 is insufficient, which may easily cause the sealing water containing the material to leak into the environment. The addition of the double sealing mechanism 12 enhances the sealing strength and increases the service life of the sealing mechanism.

Claims

1. A mechanical sealing device for a screw pump, characterized in that: It includes an extended sleeve, a dynamic ring and a static ring. The extended sleeve includes a sleeve and an extended head. One end of the dynamic ring is detachably mounted on the dynamic ring seat, and the other end is connected to one end of the static ring. The other end of the static ring is detachably mounted on the static ring seat. The dynamic ring seat is detachably mounted on the sleeve, and the static ring seat is detachably mounted on the suspension. The dynamic ring seat is connected to the sleeve by a top screw. The dynamic ring and static ring are sleeved on the sleeve. A positioning device is provided between the extended head and the dynamic ring seat. A groove is provided inside the static ring seat, and a sealing mechanism is provided between the groove and the sleeve.

2. A mechanical seal device for a screw pump according to claim 1, characterized in that: The positioning device is in a ring shape and is sleeved on the shaft sleeve.

3. The mechanical seal device of a screw pump according to claim 1, wherein: The thickness of the positioning device is equal to the distance between the extension head and the dynamic ring seat.

4. The mechanical seal device of a screw pump according to claim 1, wherein: At least two sealing mechanisms are provided, and the sealing mechanism is one of a skeleton oil seal and a labyrinth seal.

5. The mechanical seal device of a screw pump according to claim 1, characterized in that: The sealing mechanism is embedded in the groove, and the depth of the groove is 12-36 mm.

6. The mechanical seal device of a screw pump according to claim 1, characterized in that: The diameter of the sealing mechanism is the same as the diameter of the groove.

7. The mechanical seal device of a screw pump according to claim 1, characterized in that: The stationary ring seat is provided with a cooling water pipe.

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