Stainless steel light horizontal centrifugal pump outlet flange assembly structure

Abstract

The utility model discloses a stainless steel light horizontal centrifugal pump outlet flange assembly structure, which relates to the field of centrifugal pumps and comprises a hubbed flange, an upper connecting plate and a pump water outlet pipe, an inner hole is arranged at the center of the hubbed flange, the hubbed flange is bent downwards at the inner hole to form a neck part, the pump water outlet pipe extends into the inner hole, and the upper connecting plate is connected with the pump water outlet pipe. The inner wall of the neck part is welded and fixed; an opening is formed in the center of the upper connecting plate, a pump water outlet pipe penetrates through the opening, connecting holes are formed in the corresponding positions of the hubbed flange and the upper connecting plate, and the upper connecting plate is fixed to the lower portion of the hubbed flange through the connecting holes. The corresponding neck height and angle are designed according to the radian of the pump water outlet pipe and attached to the pump water outlet pipe, original single-face angle welding is changed into double-face welding through the open upper connecting plate, the welding strength is greatly improved, and water leakage caused by cold and hot cracks of welding seams is eradicated.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal pumps, and particularly to a structure of an outlet flange assembly of a stainless steel light horizontal centrifugal pump. Background Art

[0002] As Figure 1 、 2 shown, the existing centrifugal pump outlet flange assembly uses a flat plate flange (1') to be welded to the water outlet pipe (2') in a single-sided fillet weld manner, and a connecting plate (3') is installed at the lower part of the flat plate flange. The welding strength at this position is low, and the weld is prone to cracking, resulting in water leakage. In addition, the welding positioning is difficult, and misalignment is likely to occur, and the weld is not full and the appearance is not beautiful. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and to provide a structure of an outlet flange assembly of a stainless steel light horizontal centrifugal pump, so as to improve the welding strength and eliminate water leakage caused by cold and hot cracking of the weld.

[0004] The purpose of the utility model is achieved by the following technical solutions: This structure of the outlet flange assembly of a stainless steel light horizontal centrifugal pump includes a necked flange, an upper connecting plate and a pump outlet pipe. An inner hole is opened in the center of the necked flange, and the necked flange is bent downward at the inner hole to form a neck. The pump outlet pipe extends into the inner hole and is fixedly welded to the inner wall of the neck; an opening is provided in the center of the upper connecting plate for the pump outlet pipe to pass through, and connection holes are opened at corresponding positions on the necked flange and the upper connecting plate, so that the upper connecting plate is fixed to the lower part of the necked flange through the connection holes.

[0005] As a further technical solution, a J-shaped weld with a blunt edge is adopted between the upper end of the neck and the pump outlet pipe.

[0006] As a further technical solution, a single-sided V-shaped weld is adopted between the lower end of the neck and the pump outlet pipe.

[0007] As a further technical solution, a transition inclined surface is provided at the connection between the neck and the necked flange.

[0008] As a further technical solution, a plurality of annular sealing grooves are opened on the upper surface of the necked flange for installing sealing rings.

[0009] The beneficial effects of the utility model are as follows:

[0010] 1. The transition inclined surface of the new structure neck can provide better sealing effect and reduce the risk of leakage;

[0011] 2. The welding method is changed from the original single-sided welding to double-sided welding, greatly improving the welding strength;

[0012] 3. The new-structured neck can provide additional strength and support, which helps to evenly distribute stress and reduce the risk of weld cracking and leakage caused by stress concentration;

[0013] 4. The neck design of the necked flange makes the welding positioning operation easier and can achieve high-quality welding results with full and beautiful welds;

[0014] 5. To ensure the realization of double-sided welding, an open-type upper connection plate is designed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic structural diagram of a flat plate flange in the prior art.

[0016] Figure 2 FIG. is a schematic connection structure diagram of a flange assembly in the prior art.

[0017] Figure 3 FIG. is a schematic structural diagram of the necked flange in the present utility model.

[0018] Figure 4 FIG. is a schematic cross-sectional structural diagram of the necked flange, the upper connection plate and the pump outlet pipe after assembly in the present utility model.

[0019] Figure 5 FIG. is a schematic three-dimensional structural diagram of the necked flange, the upper connection plate and the pump outlet pipe after assembly in the present utility model.

[0020] Figure 6 FIG. is a schematic structural diagram of the upper connection plate in the present utility model.

[0021] DESCRIPTION OF THE REFERENCE NUMERALS: Flat plate flange 1', Water outlet pipe 2', Connection plate 3';

[0022] Necked flange 1, Neck 11, Transition slope 12, Sealing groove 13, Upper connection plate 2, Opening 21, Pump outlet pipe 3, Connection hole 4, J-groove weld with blunt edge 5, Single-sided V-groove weld 6. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following will introduce the present utility model in detail with reference to the drawings:

[0024] Embodiment: As shown in the attached Figures 3 to 6 figures, the structure of the outlet flange assembly of this stainless steel light horizontal centrifugal pump includes a necked flange 1, a neck 11, a transition slope 12, a sealing groove 13, an upper connection plate 2, an opening 21, a pump outlet pipe 3, a connection hole 4, a J-groove weld with blunt edge 5 and a single-sided V-groove weld 6.

[0025] Refer to the attached Figure 3 、 4, a central inner hole is opened in the necked flange 1. The necked flange 1 is bent downward at the inner hole to form a neck 11. The pump outlet pipe 3 (with a certain arc and being a conical pipe) extends into the inner hole and is fixedly welded to the inner wall of the neck 11. Further, a J-groove weld 5 with a blunt edge is adopted between the upper end of the neck 11 and the pump outlet pipe 3. At the same time, a single-sided V-groove weld 6 is adopted between the lower end of the neck 11 and the pump outlet pipe 3. Changing the welding method from the original single-sided welding to double-sided welding can greatly improve the welding strength.

[0026] As Figure 5 , 6 shown, an opening 21 is provided in the center of the upper connecting plate 2 for the pump outlet pipe 3 to pass through. Connecting holes 4 are opened at corresponding positions on the necked flange 1 and the upper connecting plate 2, so that the upper connecting plate 2 is fixedly screwed to the lower part of the necked flange 1 through the connecting holes 4. Preferably, a transition inclined surface 12 is provided at the connection between the neck 11 and the necked flange 1, and a plurality of annular sealing grooves 13 are opened on the upper surface of the necked flange 1, and sealing rings are installed in the sealing grooves 13.

[0027] The water outlet flange provided by the present utility model designs the corresponding neck height and angle according to the arc of the pump outlet pipe and fits the pump outlet pipe. The design adopts an opening upper connecting plate to change the original single-sided fillet welding into double-sided welding, greatly increasing the welding strength and preventing water leakage caused by cold and hot cracks in the weld.

[0028] It can be understood that for those skilled in the art, equivalent replacement or change of the technical solution and the inventive concept of the present utility model should fall within the protection scope of the claims attached to the present utility model.

Claims

1. The structure of an outlet flange assembly of a stainless steel light horizontal centrifugal pump, characterized in that: It includes a necked flange (1), an upper connection plate (2) and a pump outlet pipe (3). An inner hole is formed in the center of the necked flange (1). The necked flange (1) is bent downward at the inner hole to form a neck (11). The pump outlet pipe (3) extends into the inner hole and is fixedly welded to the inner wall of the neck (11). An opening (21) is provided in the center of the upper connection plate (2) for the pump outlet pipe (3) to pass through. Connection holes (4) are formed at corresponding positions on the necked flange (1) and the upper connection plate (2), so that the upper connection plate (2) is fixed to the lower part of the necked flange (1) through the connection holes (4).

2. The structure of the outlet flange assembly of the stainless steel light horizontal centrifugal pump according to claim 1, wherein: A J-groove weld with blunt edge (5) is adopted between the upper end of the neck (11) and the pump outlet pipe (3).

3. The structure of the outlet flange assembly of the stainless steel light horizontal centrifugal pump according to claim 1, characterized in that: A single-bevel V-groove weld (6) is adopted between the lower end of the neck (11) and the pump outlet pipe (3).

4. The structure of the outlet flange assembly of the stainless steel light horizontal centrifugal pump according to claim 1, wherein: A transition inclined surface (12) is provided at the connection between the neck (11) and the necked flange (1).

5. The structure of the outlet flange assembly of the stainless steel light horizontal centrifugal pump according to claim 1, characterized in that: A plurality of annular sealing grooves (13) are formed on the upper surface of the necked flange (1) for installing sealing rings.

Images