External pipe flange connection sealing structure for vertical mixed-flow pump

Abstract

The utility model discloses an external pipe flange connecting and sealing structure for a vertical mixed-flow pump, which comprises a lower external pipe flange, an upper external pipe flange, an O-shaped ring, a plurality of connecting bolts and at least two positioning bolts, the lower externally-connected pipe flange and the upper externally-connected pipe flange are centered and positioned through positioning bolts which simultaneously penetrate through the lower externally-connected pipe flange and the upper externally-connected pipe flange, and are connected and locked through connecting bolts which simultaneously penetrate through the lower externally-connected pipe flange and the upper externally-connected pipe flange; annular grooves are formed in the end faces of the ends, making contact with each other, of the lower externally-connected pipe flange and the upper externally-connected pipe flange. When the external pipe of the vertical mixed-flow pump is installed, centering of the external pipe is well controlled, the influence of machining deformation of the external pipe on sealing of the flange faces is reduced by arranging the annular groove, it is guaranteed that the sealing faces of the upper external pipe and the lower external pipe have good sealing performance, the structure is simple, machining is easy, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to vertical mixed flow pump technical field, specifically is a kind of outer connection pipe flange connection sealing structure for vertical mixed flow pump. BACKGROUND

[0002] The outer cylinder of vertical mixed flow pump is composed of multiple outer connection pipes in series, and the degree of centering of the outer connection pipes needs to be highly guaranteed during assembly. If the centering is not good, it will cause vibration and bearing eccentric wear during pump operation. Meanwhile, the outer connection pipes are mostly welded parts, and deformation is likely to occur during processing. If the deformation is not controlled, it will cause water leakage of the sealing surface, affecting the overall sealing effect of the pump. SUMMARY

[0003] To solve the above problems in the prior art, the utility model provides an outer connection pipe flange connection sealing structure for vertical mixed flow pump, which has the functions of connecting and sealing adjacent outer connection pipes. When the outer connection pipe of the vertical mixed flow pump is installed, the centering of the outer connection pipe is well controlled. By arranging an annular groove, the influence of the deformation of the outer connection pipe during processing on the sealing of the flange surface is reduced, so that the sealing surfaces of the upper and lower outer connection pipes have good sealing performance. The connection sealing structure is simple, easy to process and low in cost.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] An outer connection pipe flange connection sealing structure for vertical mixed flow pump includes a lower outer connection pipe flange, an upper outer connection pipe flange, an O-ring, a plurality of connecting bolts and at least two positioning bolts. The lower outer connection pipe flange and the upper outer connection pipe flange are respectively sleeved on two adjacent outer connection pipes. The lower outer connection pipe flange and the upper outer connection pipe flange are positioned by the positioning bolts that pass through the lower outer connection pipe flange and the upper outer connection pipe flange at the same time. The lower outer connection pipe flange and the upper outer connection pipe flange are connected and locked by the connecting bolts that pass through the lower outer connection pipe flange and the upper outer connection pipe flange at the same time. An annular groove is arranged on the end face of the end, which is in contact with each other, of the lower outer connection pipe flange and the upper outer connection pipe flange. The through holes on the flange plates of the lower outer connection pipe flange and the upper outer connection pipe flange pass through the annular grooves, respectively.

[0006] As a further improvement of the above technical scheme:

[0007] The upper outer connection pipe flange and the lower outer connection pipe flange both have annular flange plates. A plurality of through holes that pass through the flange plates are arranged on the flange plates. The center lines of the through holes are parallel to the central axes of the flange plates. The plurality of through holes are arranged at intervals on the flange plates. The plurality of through holes include at least two positioning holes and a plurality of connecting holes. The positioning holes are for the positioning bolts to pass through. The connecting holes are for the connecting bolts to pass through.

[0008] The two positioning holes are not adjacent.

[0009] Each flange sealing surface is provided with an annular groove, the depth of the annular groove is 0.1mm-1mm, the depth refers to the size of the annular groove along the center line of the through hole.

[0010] The width of the annular groove is 5mm-20mm larger than the diameter of the through hole, and the annular groove and the flange plate are coaxial.

[0011] The lower outer connecting pipe flange is provided with an O-shaped ring groove for placing an O-shaped ring, the O-shaped ring groove and the annular groove on the lower outer connecting pipe flange are arranged on the same end surface of the flange plate of the lower outer connecting pipe flange, the O-shaped ring groove is an annular groove, the O-shaped ring groove and the flange plate of the lower outer connecting pipe flange are coaxial, and the O-shaped ring groove is located between the inner side wall of the flange plate and the annular groove.

[0012] The inner diameter of the lower outer connecting pipe flange is the same as that of the upper outer connecting pipe flange, and when the lower outer connecting pipe flange and the upper outer connecting pipe flange are coaxially arranged, the plurality of through holes on the lower outer connecting pipe flange are respectively aligned and communicated with the plurality of through holes on the upper outer connecting pipe flange.

[0013] When the lower outer connecting pipe flange and the upper outer connecting pipe flange are coaxially arranged, the annular groove on the lower outer connecting pipe flange is aligned with the annular groove on the upper outer connecting pipe flange.

[0014] The beneficial effects of the utility model are: adjacent outer connecting pipes are connected and sealed, the centering of the outer connecting pipe is well controlled during installation of the vertical mixed flow pump outer connecting pipe, the influence of outer connecting pipe machining deformation on the flange sealing is reduced by arranging the annular groove, the upper and lower outer connecting pipe sealing surfaces have good sealing performance, and the connecting and sealing structure is simple, easy to process and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the upper outer connecting pipe flange of one embodiment of the utility model.

[0016] Figure 2 It is a structure schematic view of the lower outer connecting pipe flange of one embodiment of the utility model.

[0017] Figure 3 It is a top view structure schematic view of the upper outer connecting pipe flange and the lower outer connecting pipe flange after being connected of one embodiment of the utility model.

[0018] Figure 4 It is Figure 3 A-A section structure schematic view.

[0019] Figure 5 It is Figure 4 The enlarged structure schematic view of B. DETAILED DESCRIPTION

[0020] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0021] For the convenience of description, spatial relative terms such as "above", "upper", "top", "bottom", etc. can be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0022] A kind of vertical mixed flow pump flange connection sealing structure of external pipe, as shown in Figures 1-5 Including lower external pipe flange 1, upper external pipe flange 2, O-ring 3, multiple connecting bolts 4 and at least two positioning bolts 5.

[0023] Upper external pipe flange 2, as shown in Figure 1 Including annular flange plate and cylindrical flange body 7, flange plate and cylindrical flange body 7 are coaxially connected. Upper external pipe flange 2 is provided with multiple through holes passing through flange plate, the center line of through hole or axial is parallel to the center line or central axis of the flange plate of upper external pipe flange 2, multiple through holes are arranged at intervals on the flange plate of upper external pipe flange 2, i.e. multiple through holes are arranged at intervals on the same circumference. Multiple through holes on upper external pipe flange 2 include two positioning holes 8 and multiple connecting holes 9. One end face of the flange plate of upper external pipe flange 2 is provided with a annular groove 6, the annular groove 6 is a groove arranged on the end face of flange plate, the central axis of the annular groove 6 coincides with the central axis of the flange plate. Each positioning hole 8 and connecting hole 9 passes through annular groove 6, in other words, one entrance and exit of each positioning hole 8 and connecting hole 9 is arranged on the groove bottom surface of annular groove 6, the width of annular groove 6 is greater than the hole diameter of positioning hole 8 and connecting hole 9. Preferably, two positioning holes 8 on upper external pipe flange 2 are not adjacent, and two positioning holes 8 are located on the same radial. The depth of annular groove 6 is 0.1mm-1mm, the depth refers to the dimension of annular groove 6 along the axial direction of through hole. The width of annular groove 6 is 5mm-20mm greater than the diameter of through hole.

[0024] The technical features of lower external pipe flange 1 include the above structural features of upper external pipe flange 2, as shown inFigure 2 As shown, the lower external pipe flange 1 also comprises an annular flange plate and a cylindrical flange body 7, and the flange plate and the cylindrical flange body 7 are coaxially connected. The lower external pipe flange 1 is provided with a plurality of through holes passing through the flange plate, the center line of the through holes or the axial direction is parallel to the center line or the central axis of the flange plate of the lower external pipe flange 1, and the plurality of through holes are arranged at intervals on the flange plate of the lower external pipe flange 1, that is, the plurality of through holes are arranged at intervals on the same circumference. The plurality of through holes on the lower external pipe flange 1 comprise two positioning holes 8 and a plurality of connecting holes 9. One end of the flange plate of the lower external pipe flange 1 is provided with an annular groove 6, which is a groove provided on the end face of the flange plate, and the central axis of the annular groove 6 coincides with the central axis of the flange plate. Each positioning hole 8 and connecting hole 9 passes through the annular groove 6, in other words, one entrance and exit of each positioning hole 8 and connecting hole 9 is arranged on the groove bottom surface of the annular groove 6, and the width of the annular groove 6 is greater than the hole diameter of the positioning hole 8 and the connecting hole 9. Preferably, the two positioning holes 8 on the lower external pipe flange 1 are not adjacent, and the two positioning holes 8 are located on the same radial direction. The depth of the annular groove 6 is 0.1mm-1mm, and the depth refers to the dimension of the annular groove 6 along the axial direction of the through hole. The width of the annular groove 6 is 5mm-20mm larger than the diameter of the through hole.

[0025] In addition, the lower external pipe flange 1 is also provided with an O-ring groove 10 for placing the O-ring 3, and the O-ring groove 10 and the annular groove 6 on the lower external pipe flange 1 are arranged on the same end face of the flange plate of the lower external pipe flange 1. The O-ring groove 10 is an annular groove, the O-ring groove 10 and the annular groove 6 of the lower external pipe flange 1 share the central axis, and the O-ring groove 10 is located between the inner side wall of the flange plate and the annular groove 6.

[0026] The inner diameter of the lower external pipe flange 1 is the same as the inner diameter of the upper external pipe flange 2, and when the lower external pipe flange 1 and the upper external pipe flange 2 are coaxially arranged, the plurality of through holes on the lower external pipe flange 1 can be respectively aligned and communicated with the plurality of through holes on the upper external pipe flange 2.

[0027] In use, the one side of the lower outer pipe flange 1 provided with the O-ring groove 10 faces upward, the O-ring 3 is placed in the O-ring groove 10 of the lower outer pipe flange 1, and the one end face of the upper outer pipe flange 2 provided with the annular groove 6 is attached to the one end face of the lower outer pipe flange 1 provided with the annular groove 6, so that the two positioning holes 8 of the lower outer pipe flange 1 are respectively and initially aligned and communicated with the two positioning holes 8 of the upper outer pipe flange 2, initial positioning is realized, and the connecting holes 9 of the lower outer pipe flange 1 are respectively aligned and communicated with the connecting holes 9 of the upper outer pipe flange 2. Obviously, at this time, the upper outer pipe flange 2 is located above the lower outer pipe flange 1. Then the positioning bolt 5 for centering and positioning is respectively passed through the two aligned and communicated positioning holes 8, further positioning of the lower outer pipe flange 1 and the upper outer pipe flange 2 is realized. Then, a connecting bolt 4 is passed through the through hole formed by the aligned and communicated connecting holes 9 of the lower outer pipe flange 1 and the upper outer pipe flange 2 and is locked by a nut, fixed connection of the lower outer pipe flange 1 and the upper outer pipe flange 2 is realized. At this time, the annular grooves 6 on the lower outer pipe flange 1 and the upper outer pipe flange 2 are aligned and communicated, as shown in FIG. 6. In this way, sealing connection of the outer pipe sleeved in the lower outer pipe flange 1 and the upper outer pipe flange 2 is realized. As described above, the connecting holes 9 and the positioning holes 8 on the lower outer pipe flange 1 and the upper outer pipe flange 2 are bolt holes, and the annular groove 6 avoids the planar deformation of the flange sealing surface (i.e. the one end face of the flange plate provided with the annular groove 6) caused by machining of the bolt hole. Figure 5

[0028] Finally, it is necessary to point out that: the above embodiments are only used to further detail the technical solutions of the present application and cannot be understood as limiting the protection scope of the present application. Some non-essential improvements and adjustments made by the person skilled in the art according to the above content of the present application all belong to the protection scope of the present application.​

Claims

1. A seal structure for flange connection of an external pipe for a vertical mixed flow pump, characterized by, The application relates to a flange sealing structure of a lower outer connecting pipe and an upper outer connecting pipe.

2. The connection seal structure according to claim 1, characterized in that: The upper outer connecting pipe flange (2) and the lower outer connecting pipe flange (1) both have annular flange plates, the flange plates are provided with a plurality of through holes penetrating the flange plates, the center lines of the through holes are parallel to the central axes of the flange plates, the plurality of through holes are arranged at intervals on the flange plates, the plurality of through holes include at least two positioning holes (8) and a plurality of connecting holes (9), the positioning holes (8) are used for penetrating the positioning bolts (5), and the connecting holes (9) are used for penetrating the connecting bolts (4).

3. The connection seal structure according to claim 2, characterized in that: The two positioning holes (8) are not adjacent.

4. The connection seal structure according to claim 2, characterized by: Each flange sealing surface is provided with an annular groove (6), the depth of the annular groove (6) is 0.1mm-1mm, and the depth refers to the dimension of the annular groove (6) along the center line of the through hole.

5. The connection seal structure according to claim 4, characterized in that: The width of the annular groove (6) is 5mm-20mm larger than the diameter of the through hole, and the annular groove (6) and the flange plate where the annular groove (6) is located share a center line.

6. The connection seal structure according to any one of claims 1 to 5, characterized in that: The lower outer connecting pipe flange (1) is provided with an O-ring groove (10) for placing the O-ring (3), the O-ring groove (10) and the annular groove (6) on the lower outer connecting pipe flange (1) are arranged on the same end surface of the flange plate of the lower outer connecting pipe flange (1), the O-ring groove (10) is an annular groove, the O-ring groove (10) and the flange plate of the lower outer connecting pipe flange (1) share a center line, and the O-ring groove (10) is located between the inner side wall of the flange plate and the annular groove (6).

7. The connection seal structure according to claim 1, characterized by: The inner diameter of the lower outer connecting pipe flange (1) is the same as that of the upper outer connecting pipe flange (2), when the lower outer connecting pipe flange (1) and the upper outer connecting pipe flange (2) are arranged in a center line sharing mode, the plurality of through holes on the lower outer connecting pipe flange (1) are respectively aligned and communicated with the plurality of through holes on the upper outer connecting pipe flange (2).

8. The connection seal structure according to claim 7, characterized by: When the lower outer connecting pipe flange (1) and the upper outer connecting pipe flange (2) are arranged in a center line sharing mode, the annular groove (6) on the lower outer connecting pipe flange (1) is aligned with the annular groove (6) on the upper outer connecting pipe flange (2).

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