Threaded seal structure for a vertical pump

Abstract

A threaded sealing structure for a vertical pump includes a pump head housing, an impeller connected to the inner side of the pump head housing, a sealing ring with its inner ring connected to the outer wall surface below the impeller, a pressure plate abutting the lower end face of the sealing ring and snapping onto the pump head housing, and a front cover abutting the lower end face of the pressure plate and connected to the pump head housing. The pressure plate and the front cover have openings in their middle sections, making the lower part of the pump head housing an inlet. The impeller is threaded to the pump head housing, with the thread direction opposite to that of the impeller. The pump head housing has an opening at its upper end, where a shaft core with its lower end connected to the impeller is located. A motor is connected to the upper end of this shaft core. A labyrinth sealing ring is located on the outer wall surface of the upper end of the shaft core. The advantages of this invention are: the thread can block liquid leakage in the gap when the impeller rotates; at the motor connection, liquid leakage is prevented by the cooperation of the labyrinth sealing ring and the water-throwing ring.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a threaded sealing structure for a vertical pump. Background Technology

[0002] Traditional vertical pump shaft end sealing technology faces several technical challenges, particularly when handling high-pressure, high-temperature, and impurity-containing media. Conventional packing seals or sealing ring seals suffer from severe frictional losses under high-speed operation, requiring frequent maintenance and replacement, and their sealing effectiveness rapidly declines over time. While mechanical seals offer better performance, they are complex in structure, expensive, and require extremely high installation precision, often experiencing some degree of leakage after a period of use due to equipment aging.

[0003] Therefore, there is an urgent need to develop a threaded sealing structure for vertical pumps that ensures the device retains its sealing performance even after wear. Utility Model Content

[0004] This utility model aims to solve at least one of the above-mentioned technical problems to a certain extent.

[0005] Therefore, the purpose of this utility model is to propose a threaded sealing structure for a vertical pump, which can ensure that the device still has sealing performance after wear.

[0006] To achieve the above objectives, this utility model discloses a threaded sealing structure for a vertical pump, comprising: a pump head housing 1, an impeller 2 connected to the inner side of the pump head housing, a sealing ring 3 with its inner ring connected to the outer wall surface below the impeller 2, a pressure plate 4 abutting against the lower end face of the sealing ring 3 and snapped onto the pump head housing 1, and a front cover 5 abutting against the lower end face of the pressure plate 4 and connected to the pump head housing 1; wherein, the pressure plate 4 and the front cover 5 have openings in the middle, so that the lower part of the pump head housing 1 is an inlet; the impeller 2 is threadedly connected to the pump head housing 1, and the direction of the thread is opposite to the direction of the impeller 2.

[0007] In addition, the threaded sealing structure of the vertical pump according to the above-described technical solution of this utility model may also have the following additional technical features: Optionally, a filter screen 6 is also included at the opening of the front cover 5.

[0008] Optionally, the pump head housing 1 has an opening at its upper end, and a shaft core 7 with its lower end connected to the impeller 2 is provided at the opening at the upper end. A motor 8 is connected to the upper end of the shaft core 7. A labyrinth sealing ring 9 is provided on the outer wall surface of the upper end of the shaft core 7.

[0009] Optionally, a support plate 13 is also provided on the outer wall of the shaft core 7, and the lower end of the labyrinth sealing ring 9 is engaged with the support plate 13.

[0010] Optionally, a water-slinging ring 10 is also provided on the outer wall surface of the upper end of the shaft core 7.

[0011] Optionally, a bearing positioning sleeve 11 is provided on the outer wall surface of the upper end of the shaft core 7, and the bearing positioning sleeve 11 is located at the upper end of the labyrinth sealing ring 9.

[0012] Optionally, a motor mount 12 is provided between the motor 8 and the support plate 13.

[0013] Optionally, the impeller 2 and the shaft core 7 are connected by impeller bolts 14.

[0014] Optionally, a connecting pipe 15 is also provided between the support plate 13 and the pump head housing 1.

[0015] The beneficial effects of this utility model are as follows: 1. The thread of the impeller is opposite to the rotation direction of its blades. When the impeller rotates, the thread can block the leakage of liquid in the gap, thereby achieving a sealing effect; 2. At the motor connection, the labyrinth sealing ring and the water-slinging ring work together to prevent liquid leakage. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the threaded sealing structure of a vertical pump provided in one embodiment of this utility model; Figure 2 This is a schematic cross-sectional view of the threaded sealing structure of a vertical pump provided in another embodiment of this utility model; Figure 3 This is a perspective view of a threaded sealing structure of a vertical pump provided in another embodiment of this utility model; Figure 4 This is a side view of the impeller of a threaded sealing structure for a vertical pump, provided in one embodiment of this utility model.

[0017] Figure label: 1-Pump head housing, 2-Impeller, 3-Sealing ring, 4-Pressure plate, 5-Front cover, 6-Filter screen, 7-Shaft core, 8-Motor, 9-Labyrinth seal ring, 10-Water slinger ring, 11-Bearing positioning sleeve, 12-Motor base, 13-Support plate, 14-Impeller bolt, 15-Connecting pipe. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or components / elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] The threaded sealing structure of the vertical pump according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic cross-sectional view of the threaded sealing structure of a vertical pump provided in one embodiment of this utility model; Figure 2 This is a schematic cross-sectional view of the threaded sealing structure of a vertical pump provided in another embodiment of this utility model; Figure 3 This is a perspective view of a threaded sealing structure of a vertical pump provided in another embodiment of this utility model; Figure 4 This is a side view of the impeller of a threaded seal structure for a vertical pump, provided in one embodiment of this utility model. Figure 1-4 As shown, the threaded sealing structure of this vertical pump includes a pump head housing 1, an impeller 2 connected to the inner side of the pump head housing, a sealing ring 3 with its inner ring connected to the outer wall surface below the impeller 2, a pressure plate 4 abutting the lower end face of the sealing ring 3 and snapped onto the pump head housing 1, and a front cover 5 abutting the lower end face of the pressure plate 4 and connected to the pump head housing 1; wherein, the pressure plate 4 and the front cover 5 have openings in the middle, so that the lower part of the pump head housing 1 is the inlet; the impeller 2 is connected to the pump head housing 1 by a thread, and the direction of the thread is opposite to the direction of the impeller 2.

[0021] Specifically, the impeller 2 and the pump head housing 1 are threaded together. This thread rotates in the opposite direction to the impeller's rotation. When the impeller rotates, the thread rotates in the opposite direction, blocking water leakage from the gap and thus providing a seal. The sealing ring 3 and the impeller 2 are first pressed together with the pressure plate 4 to fix their positions, and then further secured by the front cover 5. The front cover 5 and the pump head housing 1 are connected via a threaded connection.

[0022] like Figure 4 As shown, in one embodiment of this application, the impeller 2 thread structure is tightened in a clockwise direction, while the blades of the impeller 2 rotate in a counterclockwise direction during operation, so that the rotation direction of the thread and the rotation direction of the blades are opposite.

[0023] According to the threaded sealing structure of the vertical pump of this utility model, the thread of the impeller is opposite to the rotation direction of its blades. When the impeller rotates, the thread can block the leakage of liquid in the gap, thereby achieving a sealing effect and ensuring that the device still has sealing performance after the sealing ring below wears.

[0024] According to one embodiment of the present invention, a filter screen 6 is also provided at the opening of the front cover 5.

[0025] Specifically, filter 6 is used to prevent impurities from contaminating and clogging the vertical pump.

[0026] According to one embodiment of the present invention, the pump head housing 1 has an opening at its upper end, and a shaft core 7 with its lower end connected to the impeller 2 is provided at the opening at the upper end. A motor 8 is connected to the upper end of the shaft core 7; a labyrinth sealing ring 9 is provided on the outer wall surface of the upper end of the shaft core 7.

[0027] Specifically, vertical pumps require connection to a motor, and there is also a problem of liquid leakage at the motor location. To solve this problem, a labyrinth seal ring 9 can be used to obstruct the direction of liquid flow, reducing the kinetic energy of the liquid flow and thus preventing liquid leakage.

[0028] According to one embodiment of the present invention, a support plate 13 is also provided on the outer wall of the shaft core 7, and the lower end of the labyrinth sealing ring 9 is engaged with the support plate 13.

[0029] Specifically, the support plate 13 is used to support the motor 8 on the one hand, and can also be connected and cooperated with the labyrinth sealing ring 9 on the other hand to fix the labyrinth sealing ring 9.

[0030] According to one embodiment of the present invention, a water-slinging ring 10 is also provided on the outer wall surface of the upper end of the shaft core 7.

[0031] Specifically, the water-slinging ring 10 works in conjunction with the labyrinth sealing ring 9. Based on the labyrinth sealing ring 9 reducing the kinetic energy of the liquid flow, if there is still a small amount of leaked liquid, the water-slinging ring 10 completely prevents the liquid from flowing into the motor.

[0032] According to one embodiment of the present invention, a bearing positioning sleeve 11 is provided on the outer wall surface of the upper end of the shaft core 7, and the bearing positioning sleeve 11 is located at the upper end of the labyrinth sealing ring 9.

[0033] Specifically, the bearing positioning sleeve 11 is used to position the bearing, thereby reducing the friction when the motor rotates and improving the life of the device.

[0034] According to one embodiment of the present invention, a motor seat 12 is provided between the motor 8 and the support plate 13.

[0035] Specifically, since a labyrinth sealing ring 9 or a water-slinging ring 10 is provided between the motor 8 and the support plate 13, a certain gap is required between the motor 8 and the support plate 13. This gap can be supported by motor seats 12 on both sides to improve the stability of the device.

[0036] According to one embodiment of the present invention, the impeller 2 and the shaft core 7 are connected by an impeller bolt 14.

[0037] Specifically, the impeller 2 is driven to rotate by the shaft core 7, so the impeller 2 and the shaft core 7 need to be fixedly connected, which can be achieved using the impeller bolt 14.

[0038] According to one embodiment of the present invention, a connecting pipe 15 is further provided between the support plate 13 and the pump head housing 1.

[0039] Specifically, there is a certain gap between the motor 8 and the pump head housing 1. In a vertical pump, the weight of the motor 8 and the lateral stress generated by its starting rotation should not be independently borne by the shaft core 7. Therefore, a connecting pipe 15 can be installed between the support plate 13 and the pump head housing 1 for connection. Figure 3 As shown, the connecting pipe 15 may also be provided with several ribs to ensure reliable support.

[0040] The above embodiments are preferred implementations of this application. In addition, this application can be implemented in other ways. Any obvious substitutions without departing from the concept of this application are within the protection scope of this application.

Claims

1. A threaded sealing structure for a vertical pump, characterized in that, include: Pump head housing (1), impeller (2) connected to the inside of pump head housing, sealing ring (3) with inner ring connected to the outer wall surface below the impeller (2), pressure plate (4) abutting the lower end face of the sealing ring (3) and snapped onto the pump head housing (1), and front cover (5) abutting the lower end face of the pressure plate (4) and connected to the pump head housing (1). The pressure plate (4) and the front cover (5) have openings in the middle, so that the lower part of the pump head housing (1) is the inlet; the impeller (2) is connected to the pump head housing (1) by a thread, and the direction of the thread is opposite to the direction of the impeller (2).

2. The threaded sealing structure of a vertical pump according to claim 1, characterized in that: It also includes a filter screen (6) disposed at the opening of the front cover (5).

3. The threaded sealing structure of a vertical pump according to claim 1, characterized in that: The pump head housing (1) has an opening at the upper end, and a shaft core (7) with its lower end connected to the impeller (2) is provided at the opening at the upper end. A motor (8) is connected to the upper end of the shaft core (7); a labyrinth sealing ring (9) is provided on the outer wall surface of the upper end of the shaft core (7).

4. The threaded sealing structure of a vertical pump according to claim 3, characterized in that: A support plate (13) is also provided on the outer wall of the shaft core (7), and the lower end of the labyrinth sealing ring (9) is engaged on the support plate (13).

5. The threaded sealing structure of a vertical pump according to claim 3, characterized in that: A water-slinging ring (10) is also provided on the outer wall surface of the upper end of the shaft core (7).

6. The threaded sealing structure of a vertical pump according to claim 3, characterized in that: A bearing positioning sleeve (11) is provided on the outer wall of the upper end of the shaft core (7), and the bearing positioning sleeve (11) is located at the upper end of the labyrinth sealing ring (9).

7. The threaded sealing structure of a vertical pump according to claim 4, characterized in that: A motor mount (12) is provided between the motor (8) and the support plate (13).

8. The threaded sealing structure of a vertical pump according to claim 3, characterized in that: The impeller (2) and the shaft core (7) are connected by impeller bolts (14).

9. The threaded sealing structure of a vertical pump according to claim 4, characterized in that: A connecting pipe (15) is also provided between the support plate (13) and the pump head housing (1).

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