A ceramic pump for preventing impeller from loosening

Abstract

The present invention discloses a ceramic pump for preventing an impeller from loosening, comprising an impeller, an impeller cover, a locking nut, and a pump shaft; the impeller is made of ceramic material, the pump shaft and the locking nut are made of metal material, and the impeller cover is composed of a metal skeleton and a ceramic outer lining; the impeller is sleeved on the front end of the pump shaft and is axially limited to the rear by the step surface of the rear end of the stepped positioning cone of the pump shaft; the locking nut is threadedly connected to the side wall of the smaller positioning cone at the front end of the stepped positioning cone of the pump shaft, so that the impeller is axially limited forward relative to the pump shaft; the connecting stud at the rear end of the impeller cover is threaded into the threaded hole at the front end of the pump shaft, and the outer edge of the circular cover plate of the impeller cover is pressed against the step surface on the front side of the stepped annular groove of the impeller hub, further limiting the impeller axially forward. The ceramic pump for preventing an impeller from loosening of the present invention reduces the risk of medium leakage.

Description

Technical Field

[0001] The invention relates to a ceramic pump capable of preventing an impeller from loosening, and belongs to the field of fluid machinery. Background Art

[0002] The impeller is the core component of the pump. It rotates with the shaft to transport the medium. During the working process, it will be subjected to the impact force from the medium and the axial force caused by the fluid pressure difference. At the same time, when the pump is stopped, the impeller will be reversed for a short time due to the water hammer. In order to ensure the normal operation of the impeller, an impeller locking structure must be designed on the impeller shaft head to prevent the impeller from loosening.

[0003] At the same time, with the advancement and development of modern technology, the concentration of media in some workstations is becoming increasingly higher, placing increasing demands on pumps for conveying devices. For example, in the zero-discharge workstation of wastewater desulfurization systems in power plants, the media is highly corrosive and abrasive, resulting in a very short service life for conventional metal pumps. Ceramic pumps have emerged to address these special workstations.

[0004] The impeller and pump body of a traditional ceramic pump are made of ceramic materials, but the pump shaft, which serves as a supporting and transmission component, is made of metal materials to meet the requirements of supporting strength and connection with the driving equipment. The locking nut used to lock the impeller to the front end of the pump shaft is also made of metal materials in order to be able to reliably thread it with the pump shaft and press the end face of the impeller hub. The rear end face of the outer ring of the locking nut is grooved to connect the sealing ring and the front end face of the impeller hub to tighten the seal. This technology has the following shortcomings: first, the locking nut is made of metal material and cannot cope with highly corrosive and abrasive media; second, the hardness of ceramic materials is relatively high, and the processing flatness is far inferior to that of metal. The seal at the interface between the metal surface and the ceramic surface is a line contact seal, and the seal used on the ceramic surface is prone to medium leakage. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the impeller locking structure of a traditional ceramic pump is prone to corrosion and has poor sealing reliability, which leads to the loosening of the impeller, and to provide a ceramic pump that prevents the impeller from loosening.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A ceramic pump for preventing an impeller from loosening according to the present invention comprises an impeller, an impeller cover, a locking nut, and a pump shaft;

[0008] The impeller is made of ceramic material, and the front end portion of the impeller hub is processed with a stepped annular groove;

[0009] The pump shaft is made of metal material, the front end of the pump shaft is processed with a threaded hole, the front side wall of the pump shaft is processed with a stepped positioning cone, the diameter of the larger positioning cone at the rear end of the stepped positioning cone matches the inner diameter of the impeller hub, and the side wall of the smaller positioning cone at the front end of the stepped positioning cone is processed with a connecting thread;

[0010] The impeller cover is composed of a metal frame and a ceramic outer lining. The front end of the metal frame is a circular cover plate, and the rear end of the metal frame is a connecting stud fixed vertically to the center of the rear end face of the circular cover plate. The ceramic outer lining is pressed on the front plate surface and outer edge of the circular cover plate of the metal frame. The diameter of the outer edge of the ceramic outer lining of the impeller cover matches the diameter of the larger annular groove on the front side of the stepped annular groove of the impeller hub. The connecting stud of the impeller cover is threadedly matched with the threaded hole at the front end of the pump shaft.

[0011] The locking nut is made of metal material, the outer diameter of the locking nut is not less than the inner diameter of the impeller hub, and the internal thread of the locking nut matches the connecting thread of the side wall of the smaller positioning cone at the front end of the stepped positioning cone of the pump shaft;

[0012] The impeller is sleeved on the front end of the pump shaft, and the impeller is axially limited to the rear relative to the pump shaft through the step surface at the rear end of the stepped positioning cone of the pump shaft; the locking nut is threadedly connected to the side wall of the smaller positioning cone at the front end of the stepped positioning cone of the pump shaft, and the rear end face of the locking nut is pressed against the step surface on the rear side of the stepped annular groove of the impeller hub, so that the impeller is axially limited to the front relative to the pump shaft; the connecting stud at the rear end of the impeller cover is threaded into the threaded hole at the front end of the pump shaft, and the outer edge of the impeller cover circular cover plate is pressed against the step surface on the front side of the stepped annular groove of the impeller hub, further limiting the impeller axially forward relative to the pump shaft.

[0013] The outer edge of the impeller cover ceramic outer lining and the step surface on the front side of the stepped annular groove of the impeller hub are sealed by a sealing gasket.

[0014] An annular groove is provided on the front plate surface of the circular cover plate of the metal frame of the impeller cover to improve the bonding force between the ceramic outer lining and the circular cover plate of the metal frame.

[0015] Beneficial effects

[0016] The ceramic pump for preventing the impeller from loosening of the present invention has a simple structure, is easy to install, and has good corrosion and abrasion resistance. By adopting a double locking structure of a locking nut and an impeller cover, the reliability of the pump operation is improved; the joint between the impeller cover circular cover plate and the impeller hub is reliably sealed, reducing the risk of medium leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a ceramic pump that prevents the impeller from loosening according to the present invention;

[0018] In the figure, 1-impeller, 2-sealing gasket, 3-impeller cover, 4-locking nut, 5-pump shaft. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Example

[0021] like Figure 1 As shown, a ceramic pump for preventing an impeller from loosening of the present invention comprises an impeller 1, an impeller cover 3, a locking nut 4, and a pump shaft 5;

[0022] The impeller 1 is made of ceramic material, and the front end portion of the impeller hub is processed with a stepped annular groove;

[0023] The pump shaft 5 is made of metal material, and a threaded hole is processed on the front end of the pump shaft 5. The front side wall of the pump shaft 5 is processed with a stepped positioning cone. The diameter of the larger positioning cone at the rear end of the stepped positioning cone matches the inner diameter of the impeller 1 hub, and the side wall of the smaller positioning cone at the front end of the stepped positioning cone is processed with a connecting thread.

[0024] The impeller cover 3 is composed of a metal frame and a ceramic outer lining. The front end of the metal frame is a circular cover plate, and the rear end of the metal frame is a connecting stud fixed vertically to the center of the rear end face of the circular cover plate. The ceramic outer lining is pressed on the front plate surface and outer edge of the circular cover plate of the metal frame. The diameter of the outer edge of the ceramic outer lining of the impeller cover 3 matches the diameter of the larger annular groove on the front side of the stepped annular groove of the impeller 1 hub. The connecting stud of the impeller cover 3 is threadedly matched with the threaded hole at the front end of the pump shaft 5.

[0025] The locking nut 4 is made of metal material, the outer diameter of the locking nut 4 is not less than the inner diameter of the impeller 1 hub, and the internal thread of the locking nut 4 matches the connecting thread of the side wall of the smaller positioning cone at the front end of the stepped positioning cone of the pump shaft 5;

[0026] The impeller 1 is sleeved on the front end of the pump shaft 5, and the impeller 1 is axially limited backward relative to the pump shaft 5 through the step surface at the rear end of the stepped positioning cone of the pump shaft 5; the locking nut 4 is threadedly connected to the side wall of the smaller positioning cone at the front end of the stepped positioning cone of the pump shaft 5, and the rear end face of the locking nut 4 is pressed against the step surface on the rear side of the stepped annular groove of the impeller 1 hub, so that the impeller 1 is axially limited forward relative to the pump shaft 5; the connecting stud at the rear end of the impeller cover 3 is threaded into the threaded hole at the front end of the pump shaft 5, and the outer edge of the circular cover plate of the impeller cover 3 is pressed against the step surface on the front side of the stepped annular groove of the impeller 1 hub, further limiting the impeller 1 axially forward relative to the pump shaft 5;

[0027] The outer edge of the ceramic outer lining of the impeller cover 3 and the step surface on the front side of the stepped annular groove of the impeller hub 1 are sealed by a sealing gasket 2.

[0028] An annular groove is provided on the front plate surface of the metal frame circular cover plate of the impeller cover 3 to improve the bonding force between the ceramic outer lining and the metal frame circular cover plate.

Claims

1. A ceramic pump for preventing an impeller from loosening, characterized by: Including impeller, impeller cover, locking nut, pump shaft; The impeller is made of ceramic material, and the front end portion of the impeller hub is processed with a stepped annular groove; The pump shaft is made of metal material, the front end of the pump shaft is processed with a threaded hole, the front side wall of the pump shaft is processed with a stepped positioning cone, the diameter of the larger positioning cone at the rear end of the stepped positioning cone matches the inner diameter of the impeller hub, and the side wall of the smaller positioning cone at the front end of the stepped positioning cone is processed with a connecting thread; The impeller cover is composed of a metal frame and a ceramic outer lining. The front end of the metal frame is a circular cover plate, and the rear end of the metal frame is a connecting stud fixed vertically to the center of the rear end face of the circular cover plate. The ceramic outer lining is pressed on the front plate surface and outer edge of the circular cover plate of the metal frame. The diameter of the outer edge of the ceramic outer lining of the impeller cover matches the diameter of the larger annular groove on the front side of the stepped annular groove of the impeller hub. The connecting stud of the impeller cover is threadedly matched with the threaded hole at the front end of the pump shaft. The locking nut is made of metal material, the outer diameter of the locking nut is not less than the inner diameter of the impeller hub, and the internal thread of the locking nut matches the connecting thread of the side wall of the smaller positioning cone at the front end of the stepped positioning cone of the pump shaft; The impeller is sleeved on the front end of the pump shaft, and the impeller is axially limited to the rear relative to the pump shaft through the step surface at the rear end of the stepped positioning cone of the pump shaft; the locking nut is threadedly connected to the side wall of the smaller positioning cone at the front end of the stepped positioning cone of the pump shaft, and the rear end face of the locking nut is pressed against the step surface on the rear side of the stepped annular groove of the impeller hub, so that the impeller is axially limited to the front relative to the pump shaft; the connecting stud at the rear end of the impeller cover is threaded into the threaded hole at the front end of the pump shaft, and the outer edge of the impeller cover circular cover plate is pressed against the step surface on the front side of the stepped annular groove of the impeller hub, further limiting the impeller axially forward relative to the pump shaft.

2. A ceramic pump for preventing an impeller from loosening according to claim 1, characterized in that: The outer edge of the impeller cover ceramic outer lining and the step surface on the front side of the stepped annular groove of the impeller hub are sealed by a sealing gasket.

3. A ceramic pump for preventing an impeller from loosening according to claim 1 or 2, characterized in that: An annular groove is provided on the front plate surface of the circular cover plate of the impeller cover metal frame.

Images