An impeller bearing hole sealing end cover in a pump structure

Abstract

The invention discloses a sealing end cover for an impeller bearing hole in a pump structure, comprising a dome body, a center frustum at the center of the dome bottom plane of the dome body, a plurality of pin key holes formed on the outer circumference of the center frustum, a threaded hole formed on the axial end surface of the center frustum corresponding to each pin key hole position, each threaded hole is connected with the pin key hole at the corresponding position, a bolt is screwed into each threaded hole, and the bolt enters the corresponding pin key hole, each pin key hole is coaxially slidably assembled with a pin key, and a spring is arranged between the pin key and the bolt in each pin key hole. The invention has the advantages of simple processing and installation, convenient use, and good sealing performance.

Description

Technical Field

[0001] The invention relates to the field of pump impellers, in particular to an impeller bearing hole sealing end cover in a pump structure. Background Art

[0002] like Figure 1 As shown, the existing pump impeller structure includes a circular wheel body A, and a bearing hole B coaxially penetrating the circular wheel body A is formed in the inner center of the circular wheel body A for connecting and installing the impeller shaft. Blades are formed on the outer circumference of the circular wheel body A, and one axial end of the bearing hole B is set as a reduced diameter port as the inlet end C. When the pump is working in a liquid medium, fine particles contained in the liquid medium are easy to enter the impeller from the inlet end C along with the liquid medium, and rub against the impeller shaft in the impeller bearing hole B, thereby causing problems such as damage to the impeller shaft and reduced service life. Therefore, it is generally necessary to install a sealing end cover on the end face corresponding to the inlet end C in the bearing hole B of the circular wheel body A, so that the sealing end cover covers the inlet end C, so as to seal the inlet end C as much as possible and prevent particles from entering the bearing hole B with the liquid medium. The existing impeller bearing hole inlet end sealing end cover generally has the following forms:

[0003] One is to process threads on the inner wall of the inlet end C so that the sealing end cover can be screwed together through an external threaded part when covering the inlet end C; however, since the inlet end C is a reduced diameter port, processing threads on its inner wall is difficult and inconvenient.

[0004] Secondly, a clamp is provided on the inner wall or outer wall of the end of the circular wheel body A where the inlet end C is located, for clamping and fixing the sealing end cover; however, providing a clamp on the inner wall of the end of the circular wheel body A requires occupying additional internal space of the circular wheel body A, and is also prone to interfere with the impeller shaft; while providing a clamp on the outer wall of the end of the circular wheel body A, the force generated by the flow of liquid may easily cause the clamp to loosen.

[0005] The third method is to fix the sealing end cover directly by screwing bolts that penetrate the sealing end cover along the axial direction and screw into the end of the circular wheel body A where the inlet end C is located; although this method is simple and commonly used, there is a problem of a large gap between the sealing end cover and the circular wheel body A when the force is uneven, and it is still impossible to prevent particles from entering the bearing hole B along with the liquid medium. SUMMARY OF THE INVENTION An object of the present invention is to provide a sealing end cover for an impeller bearing hole in a pump structure, so as to solve the problem of poor sealing performance of the impeller sealing end cover for pumps in the prior art.

[0006] A sealing end cover for an impeller bearing hole in a pump structure, characterized in that: it comprises a solid dome-shaped body, a raised central cone is formed at the center of the dome bottom plane of the dome body, the outer diameter of the central cone is smaller than the inner diameter of the inlet end of the impeller bearing hole, multiple positions of the outer circumferential side wall of the central cone are respectively formed with pin key holes in the central cone along their respective radial directions, and the axial end surface of the central cone is respectively formed with threaded holes in the central cone corresponding to the hole end position of each pin key hole located in the central cone, the hole end of each threaded hole located in the central cone is respectively connected with the hole end of the corresponding pin key hole located in the central cone, a bolt is respectively screwed into each threaded hole, and each axial end of each bolt respectively enters the hole end of the pin key hole corresponding to the threaded hole, each pin key hole is respectively coaxially slidably assembled with a pin key, and each axial end of each pin key passes through the hole opening of the pin key hole, and a spring is respectively arranged in each pin key hole between the other axial end of the pin key and the corresponding axial end of the bolt, one axial end of the spring contacts the pin key, and the other axial end of the spring contacts the side of the axial end of the bolt.

[0007] The impeller bearing hole sealing end cover in the pump structure is characterized in that the pin holes are evenly distributed on the outer circumference of the central cone, and the hole centers of the pin holes are located on the outer circumference of the central cone at the same axial height.

[0008] The impeller bearing hole sealing end cover in the pump structure is characterized in that the hole end of each pin key hole in the central cone and the hole end of the corresponding threaded hole in the central cone are connected at the 1 / 2 position of the radius of the central cone where the pin key hole is located.

[0009] The impeller bearing hole sealing end cover in the pump structure is characterized in that one axial end of the spring facing the corresponding pin is fixedly connected to the pin.

[0010] The impeller bearing hole sealing end cover in the pump structure is characterized in that: the other axial end of the spring facing the corresponding axial end of the bolt is fixedly connected to a sliding column, and the end of the sliding column facing the bolt is formed into a round head, and the axial end of the bolt is in contact with the round head end of the sliding column.

[0011] The impeller bearing hole sealing end cover in the pump structure is characterized in that the axial end of the bolt is formed into a conical head which contacts the round head of the sliding column.

[0012] When installing the present invention, it is only necessary to form a plurality of slots on the inner wall of the inlet end of the impeller bearing hole, which are used to match the pin keys one by one. When installing, the central cone is allowed to enter the inlet end of the impeller bearing hole, and the dome body covers the inlet end of the bearing hole through its dome bottom plane, and then each bolt is tightened. During the tightening process of the bolts, force is applied to the spring, and then the end of the pin key passing through the pin key hole is pinned into the slot on the inner wall of the inlet end of the bearing hole through the spring. When the bolts are tightened, the corresponding end of the spring is limited, so that the pin key is pinned into the slot at the inlet end of the bearing hole and cannot rebound.

[0013] In the present invention, a slot is machined on the inner wall of the inlet end of the bearing hole, which is obviously more convenient than setting a fixture and machining a threaded wire in the prior art; and in order to ensure that the dome is tightly combined with the inlet end, a suitable slot position can be selected according to the axial size of the center cone, the internal axial size of the inlet end, the position of the pin, etc., and the selection of the slot position only requires measuring the corresponding size, which is also more convenient.

[0014] After the present invention is assembled, since the central truncated cone is laterally connected to the inner wall of the inlet end of the bearing hole, no interference is caused to the bearing installed in the bearing hole.

[0015] After the present invention is assembled, each pin can be tightly pinned into its corresponding bearing hole under the action of the spring limiting the bolt, and cannot be detached before the bolt is detached, thereby enabling the sealing end cover to be tightly combined with the inlet end of the impeller bearing hole, and having good sealing ability.

[0016] In the present invention, the dome-shaped body can disperse the liquid medium. When the liquid medium containing particles hits the dome-shaped body, the liquid medium spreads to all sides, thereby keeping the particles away from the opening end of the bearing hole.

[0017] Therefore, compared with the prior art, the present invention has the advantages of simple processing and installation, convenient use and good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of an impeller for a pump in the prior art.

[0019] Figure 2 It is a schematic diagram of the structure of the present invention.

[0020] Figure 3 It is a structural perspective view of the present invention.

[0021] Figure 4 It is a front cross-sectional view of the internal structure of the spring of the present invention when it is connected with a sliding column.

[0022] Figure 5a It is a front view of the present invention and the impeller assembly structure.

[0023] Figure 5bIt is a rear view of the assembly structure of the present invention and the impeller. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] like Figure 2 , Figure 3 As shown, a sealing end cover for an impeller bearing hole in a pump structure of the present invention comprises a solid dome body 1, a raised central cone 2 is formed at the center of the dome bottom plane of the dome body 1, the outer diameter of the central cone 2 is smaller than the inner diameter of the inlet end of the impeller bearing hole, pin holes 3 are formed at four positions of the outer circumferential side wall of the central cone 2 along their own radial directions into the central cone, the four pin holes 3 are evenly distributed on the outer circumference of the central cone 2, and the orifice centers of each pin hole 3 are located on the outer circumference of the central cone 2 at the same axial height.

[0026] The axial end surface of the center cone 2 (i.e. Figure 1 The upper end surface in the middle) corresponds to the hole end position of each pin key hole 3 located in the center cone 2, and a threaded hole 4 is formed in the center cone, and the axial direction of the threaded hole 4 is parallel to the axial direction of the center cone 2. The hole end of each threaded hole 4 located in the center cone 2 is connected with the hole end of the corresponding pin key hole 3 located in the center cone 2, and the hole end of each pin key hole 3 in the center cone 2 is connected with the corresponding hole end of the threaded hole 4 in the center cone 2 at the 1 / 2 position of the radius of the center cone 2 where the pin key hole 3 is located.

[0027] like Figure 4 As shown, a bolt 5 is screwed into each threaded hole 4, and one axial end of each bolt 5 enters into the hole end of the pin key hole 3 corresponding to the threaded hole 4, and each pin key hole 3 is coaxially slidably assembled with a pin key 6, and one axial end of each pin key 6 passes through the hole opening of the pin key hole 3, and a spring 7 is arranged in each pin key hole 3 between the other axial end of the pin key 6 and the corresponding axial end of the bolt 5, one axial end of the spring 7 contacts the pin key 6 or is fixedly connected to the pin key 6, and the other axial end of the spring 7 contacts the side of the axial end of the bolt 5.

[0028] Alternatively, the spring 7 is fixedly connected to the other axial end of the corresponding bolt 5 with a sliding column 8, and the sliding column 8 is formed into a round head at one end facing the bolt 5, and the axial end of the bolt 5 is formed into a conical head that contacts the round head of the sliding column 8.

[0029] like Figure 5a and Figure 5bAs shown, during installation, four slots are pre-machined on the inner wall of the inlet end of the bearing hole B of the impeller A, and then the dome bottom plane of the dome body 1 located in the bearing hole B of the impeller A covers the end face of the inlet end of the bearing hole B of the impeller A, and the center frustum 2 enters the inlet end, and the dome body 1 and the center frustum 2 are rotated as a whole, so that the pin key hole 3 corresponds to the slot hole position of the inner wall of the inlet end of the bearing hole B of the impeller A one by one, and then the bolt 5 is screwed into each threaded hole 4, and the end of the bolt 5 enters the pin key hole 3 and presses against the end of the spring 7 to apply force to the spring 7, or presses against the round head of the sliding column 8 to apply force to the spring 7, and the corresponding pin key 6 is pinned into the slot hole of the inner wall of the inlet end of the bearing hole B of the impeller A through the spring 7 to complete the installation.

[0030] The embodiments described in the present invention are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have all been recorded in the claims.

Claims

1. A sealing end cover for an impeller bearing hole in a pump structure, characterized in that: It comprises a solid dome-shaped body, wherein a raised center cone is formed at the center of the dome bottom plane of the dome body, wherein the outer diameter of the center cone is smaller than the inner diameter of the inlet end of the impeller bearing hole, and multiple positions of the outer circumferential side wall of the center cone are respectively formed with pin key holes in the center cone along their respective radial directions, and the axial end surface of the center cone is respectively formed with threaded holes in the center cone corresponding to the hole end positions of each pin key hole in the center cone, and the hole ends of each threaded hole in the center cone are respectively connected with the hole ends of the corresponding pin key holes in the center cone, and bolts are respectively screwed into each threaded hole, and each axial end of each bolt respectively enters the hole end of the pin key hole corresponding to the threaded hole, and each The pin key holes are coaxially slidably equipped with pin keys, and one axial end of each pin key passes through the orifice of the pin key hole, and a spring is arranged in each pin key hole between the other axial end of the pin key and the corresponding axial end of the bolt, one axial end of the spring contacts the pin key, and the other axial end of the spring contacts the side of the axial end of the bolt, the axial end of the spring facing the corresponding pin key is fixedly connected to the pin key, and the other axial end of the spring facing the corresponding axial end of the bolt is fixedly connected to a sliding column, the end of the sliding column facing the bolt is formed into a round head, the axial end of the bolt contacts one end of the round head of the sliding column, and the axial end of the bolt is formed into a conical head contacting the round head of the sliding column.

2. The impeller bearing hole sealing end cover in a pump structure according to claim 1, characterized in that: The pin key holes are evenly distributed on the outer circumference of the central cone, and the opening centers of the pin key holes are located on the outer circumference of the central cone at the same axial height.

3. The impeller bearing hole sealing end cover in a pump structure according to claim 1, characterized in that: The hole end of each pin key hole in the central truncated cone is connected to the hole end of the corresponding threaded hole in the central truncated cone at a position of 1 / 2 of the radius of the central truncated cone where the pin key hole is located.

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