Lip seal structure for centrifugal pump

Abstract

The utility model discloses a lip seal structure for a centrifugal pump, which relates to the technical field of centrifugal pumps and comprises a pump shell, a pump cover is mounted at the bottom end of the pump shell, a bearing gland is arranged at the bottom of the pump cover, a bearing is arranged at the bottom end of the bearing gland, a pump shaft is arranged in the bearing, and the top end of the pump shaft extends into the pump shell. The pump shaft is arranged on the pump cover, an impeller is arranged at the top end of the pump shaft, a shaft sleeve is arranged on the outer side of the pump shaft, and a lip seal is arranged on the portion, connected with the pump shaft, of the pump cover, the double lip seals are installed in the pump cover, the lip seals are matched with the shaft sleeve to seal a gap between the pump shaft and the pump cover, and therefore the sealing effect is achieved. And furthermore, through double-lip type sealing and shaft sleeve combined type sealing, the structure is convenient to install, low in cost, resistant to vibration, high in continuous usability and low in installation, use and maintenance cost, and the sealing becomes simple and economical.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a lip seal structure for centrifugal pumps. Background Art

[0002] A centrifugal pump is a pump that can be used to transport liquids. It transports liquids through the centrifugal force generated by the rotation of the impeller. When the liquid contacts the impeller blades, the blades act on the liquid and cause it to rotate. Due to the impact of the blades, the energy of the liquid flow increases and accelerates. Under the action of centrifugal force, the liquid rotates at high speed and is thrown into the volute. According to Bernoulli's principle, the liquid flow rate increases significantly under the acceleration of the impeller, thereby reducing the static pressure, making the liquid have a higher dynamic pressure and flowing out from the outlet.

[0003] At present, in the industrial or civil fields, the shaft sealing device of the centrifugal pump generally adopts mechanical seals. Mechanical seals are expensive, difficult to install, extremely easy to be damaged and leak in situations with large vibrations, low continuous reuse rate, and high installation, use and maintenance costs. Therefore, a lip seal structure for a centrifugal pump is needed to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to make up for the deficiencies of the prior art and to provide a lip seal structure for a centrifugal pump.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lip seal structure for a centrifugal pump, comprising a pump casing, a pump cover installed at the bottom end of the pump casing, a bearing pressure cover provided at the bottom of the pump cover, a bearing provided at the bottom end of the bearing pressure cover, a pump shaft provided in the bearing, and the top end of the pump shaft extends into the pump casing, an impeller is provided at the top end of the pump shaft, a shaft sleeve is provided on the outside of the pump shaft, and a lip seal is provided at the portion where the pump cover is connected to the pump shaft.

[0006] Preferably, both sides of the shaft sleeve are threadedly connected with set screws, and ends of the two set screws are in contact with the shaft sleeve.

[0007] Preferably, an oil seal is provided on the top of the bearing gland, and the pump shaft is located inside the oil seal.

[0008] Preferably, an O-ring is disposed inside the shaft sleeve, and the O-ring fits the pump shaft.

[0009] Preferably, the pump cover is detachably connected to the bottom of the pump casing, and the shaft sleeve is made of sprayed ceramic material.

[0010] Beneficial effects:

[0011] Compared with the prior art, the lip seal structure for a centrifugal pump has the following beneficial effects:

[0012] 1. The utility model installs a double-lip lip seal inside the pump cover. The lip seal and the shaft sleeve cooperate with each other. The lip seal and the shaft sleeve cooperate to seal the gap between the pump shaft and the pump cover to achieve a sealing effect, which greatly enhances the sealing performance. Furthermore, the structure uses a double-lip seal and a shaft sleeve combined seal, which is easy to install, low in cost, vibration-resistant, and has strong continuous use performance. The installation and maintenance costs are low, making the sealing simple and economical.

[0013] 2. When the sleeve is worn, the end of the set screw can be disengaged from the pump shaft by turning the set screw outward, so that the position of the sleeve can be adjusted up and down, so that the sleeve can be reused many times, which is economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the utility model;

[0015] Figure 2 For this utility model Figure 1 A local enlarged schematic diagram of point A in the figure.

[0016] In the figure: 1. Pump casing; 2. Pump cover; 3. Bearing cover; 4. Bearing; 5. Pump shaft; 6. Impeller; 7. Bushing; 8. Lip seal; 9. Oil seal; 10. O-ring; 11. Set screw. DETAILED DESCRIPTION

[0017] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0018] like Figure 1-2As shown, a lip seal structure for a centrifugal pump includes a pump housing 1, characterized in that: a pump cover 2 is installed at the bottom end of the pump housing 1, and a bearing gland 3 is provided at the bottom of the pump cover 2. An oil seal 9 is provided at the top of the bearing gland 3, and a pump shaft 5 is located on the inner side of the oil seal 9. The design of the oil seal 9 is that the oil seal 9 is installed inside the front bearing gland 3. When a slight leakage occurs in the lip seal 8, the oil seal 9 can block the medium from entering the bearing 4 for a period of time to protect the bearing 4. A bearing 4 is provided at the bottom end of the bearing gland 3, a pump shaft 5 is provided in the bearing 4, and the top end of the pump shaft 5 extends into the pump housing 1, an impeller 6 is provided at the top end of the pump shaft 5, and a shaft sleeve 7 is provided on the outer side of the pump shaft 5. Both sides of the shaft sleeve 7 are threadedly connected with set screws 11, and the ends of the two set screws 11 are in contact with the shaft sleeve 7. When the shaft sleeve 7 is worn, the set screws 11 can be turned outward to make the ends of the set screws 11 disengage from the pump shaft, so as to adjust the position of the shaft sleeve 7 up and down, so that the shaft sleeve 7 can be reused many times, which is beneficial to saving economy. The pump cover 2 is detachably connected to the bottom of the pump housing 1. The shaft sleeve 7 is made of sprayed ceramic material, which has lubrication and wear resistance and can extend the service life of the lip seal. An O-ring 10 is arranged inside the shaft sleeve 7, and the O-ring 10 fits with the pump shaft 5, and the O-ring 10 further enhances the sealing performance. The part where the pump cover 2 is connected to the pump shaft 5 is provided with a lip seal 8.

[0019] During operation, a double-lip lip seal is installed inside the pump cover 2, and the lip seal 8 and the shaft sleeve 7 cooperate with each other. The lip seal 9 cooperates with the shaft sleeve 7 to seal the gap between the pump shaft 5 and the pump cover 2, thereby achieving a sealing effect, which greatly enhances the sealing performance. Furthermore, the structure is sealed by a combination of a double-lip seal and a shaft sleeve 7, which is easy to install, low in cost, resistant to vibration, strong in continuous use, and low in installation, use and maintenance costs, making sealing simple and economical.

[0020] Working principle: The shaft sleeve 7 made of sprayed ceramic material has lubrication and wear resistance, which can extend the service life of the lip seal. A double-lip lip seal is installed in the pump cover 2. The lip seal 8 and the shaft sleeve 7 cooperate with each other. The gap between the pump shaft 5 and the pump cover 2 is sealed by the lip seal 9 and the shaft sleeve 7, so as to achieve the sealing effect, which greatly enhances the sealing performance. In addition, the design of the oil seal 9 is to install the oil seal 9 in the front bearing gland 3. When there is a slight leakage in the lip seal 8, the oil seal 9 can block the medium from entering the bearing 4 for a period of time to protect the bearing 4. At the same time, when the shaft sleeve 7 is worn, the set screw 11 can be turned outward to make the end of the set screw 11 out of contact with the pump shaft. At this time, the shaft sleeve is movably connected to the pump shaft, and the position of the shaft sleeve 7 can be adjusted up and down, so that the shaft sleeve 7 can be reused many times, which is conducive to saving economy. Furthermore, the structure is easy to install, low cost, vibration-resistant, and has strong continuous use. The installation and maintenance cost is low, making the sealing simple and economical.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lip seal structure for a centrifugal pump, comprising a pump housing (1), characterized in that: A pump cover (2) is installed at the bottom end of the pump housing (1), a bearing cover (3) is provided at the bottom of the pump cover (2), a bearing (4) is provided at the bottom end of the bearing cover (3), a pump shaft (5) is provided in the bearing (4), and the top end of the pump shaft (5) extends into the pump housing (1), an impeller (6) is provided at the top end of the pump shaft (5), a shaft sleeve (7) is provided on the outside of the pump shaft (5), and a lip seal (8) is provided at the portion where the pump cover (2) is connected to the pump shaft (5).

2. A lip seal structure for a centrifugal pump according to claim 1, characterized in that: A set screw (11) is threadedly connected to the side surface of the shaft sleeve (7), and the end of the set screw (11) is in contact with the shaft sleeve (7).

3. A lip seal structure for a centrifugal pump according to claim 2, characterized in that: Two fixing screws (11) are arranged on the side of the shaft sleeve (7), and the two fixing screws (11) are respectively located on two sides of the shaft sleeve (7).

4. A lip seal structure for a centrifugal pump according to claim 1, characterized in that: An oil seal (9) is provided on the top of the bearing gland (3), and the pump shaft (5) is located on the inner side of the oil seal (9).

5. The lip seal structure for a centrifugal pump according to claim 1, characterized in that: An O-ring (10) is arranged inside the shaft sleeve (7), and the O-ring (10) fits the pump shaft (5).

6. A lip seal structure for a centrifugal pump according to claim 1, characterized in that: The pump cover (2) is detachably connected to the bottom of the pump housing (1), and the shaft sleeve (7) is made of sprayed ceramic material.

Images