JPS6139120Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention relates to a large vertical shaft pump of the centrifugal pump type using a concrete casing, and in particular, the shaft support that supports and seals the vertical shaft, and the impeller at the bottom of the vertical shaft. This invention relates to a large vertical shaft pump that allows adjustment of the mounting position between the casing liner and the casing liner, which face each other with a minute gap. (Prior art) As shown in FIG. 1, a conventional large-scale vertical shaft pump of this kind has a water conduit 2 extending tangentially from a part of the circumference and extending upward from the opened center side. It has a steel plate casing form 1 having a spiral annular shape with a circular cross section in the radial direction, which is provided with a shaft support mounting flange 3 and a liner mounting flange 4 on the lower side. , concrete 5 is poured and hardened to form a concrete casing, and the shaft support mounting flange 3 is
In this case, a shaft support 7 , in which the vertical shaft 6 is supported by a bearing device 8 and sealed by a shaft sealing device 9, is attached via a support flange 10 protruding from the upper outer circumferential surface of the support 7, and is also attached to the liner mounting flange 4. In this example, a casing liner 12 facing an impeller 11 provided at the lower part of a vertical shaft 6 with a small gap is attached via a support flange 13 protruding from the outer peripheral surface of the casing liner 12. In addition, in the figure, 14 indicates a suction port, and 15 indicates a fluid passage. (Problems to be solved by the invention) Here, the concrete casing is formed by precisely centering and positioning the casing formwork 1 on a temporary stand and fixing it, and then pouring concrete and hardening it. , casing formwork
Since 1 itself is a thin steel plate and is large, the accuracy may be disturbed or deformed due to driving pressure or lifting force. Casing formwork 1
If the accuracy is disrupted or deformed, the shaft support 7 and casing liner 12 that are attached to it cannot be installed in the correct position, resulting in the problem that the installation positions of the shaft support 7 and casing liner 12 are misaligned. It was hot. Furthermore, even after installation, there was a problem in that the installation position could become misaligned due to the effects of ground subsidence, earthquakes, etc. The problem to be solved by this invention is to be able to reliably correct the misalignment of the mounting position of the shaft support and casing liner that occurs during or after installation. (Means for solving the problem) In this invention, in order to solve the above problem,
Between the support flange of the shaft support and the shaft support mounting flange, and between the support flange of the casing liner and the liner installation flange, there is an outer ring that faces the outer peripheral surface of the support flange and fits into the mounting flange. After interposing the adjustment tube and sealing the space between them with an O-ring, etc., insert adjustment shims from multiple points in the circumferential direction between the mounting flange and the adjustment tube, or insert adjustment shims at multiple points in the circumferential direction of the mounting flange. The axial mounting position can be adjusted by screwing in and out the adjustment bolts that support the adjustment tube, and screws are screwed into multiple locations in the circumferential direction of the outer ring to protrude from the outer circumferential surface of the support flange. The mounting position in the circumferential direction can be adjusted by screwing the applied adjustment bolts forward and backward. (Function) Therefore, according to such a configuration, as described above, the accuracy of the casing formwork is disturbed or deformed, and the shaft support and the casing liner attached to the casing formwork are misaligned in their mounting positions. In this case, first insert an adjustment shim between the shaft support mounting flange and the adjustment tube on the mounting side of the shaft support, or
Alternatively, screw the adjustment bolts screwed into multiple locations in the circumferential direction of the shaft support mounting flange to advance and retract the adjustment cylinder to adjust it upwards and downwards, and then support the support flange of the shaft support on this adjustment cylinder. For example, the shaft support can be installed without any deviation in parallelism.
In addition, if the shaft support is misaligned, adjust the protruding length of each adjustment bolt by pressing each adjustment bolt threaded onto the outer ring of the adjustment tube against the outer peripheral surface of the support flange of the shaft support. For example, the shaft support can be installed without misalignment. On the other hand, to correct the deviation in parallelism on the mounting side of the casing liner, as in the above-mentioned adjustment of the shaft support, it is necessary to insert adjustment shims between the liner mounting flange and the adjustment tube, or to prevent By screwing in and out the adjustment bolts screwed into the casing liner, you can adjust the adjustment cylinder up and down, and then support the mounting flange of the casing liner on this adjustment cylinder to prevent the casing liner from becoming out of parallel. It can be installed without. In addition, if the casing liner is misaligned, as in the case of the shaft support described above, each adjusting bolt threaded onto the outer circumferential ring of the adjusting cylinder should be butted against the outer circumferential surface of the support flange of the casing liner, and each adjusting bolt By adjusting the protruding length of the casing liner, the casing liner can be installed without misalignment. (Effects of the invention) As described above, according to this invention, the misalignment of the mounting position of the shaft support and casing liner, which is common in large vertical shaft pumps with concrete casings, can be prevented not only during installation but also after installation. It can also be adjusted in response to changes over time, ground subsidence, earthquakes, etc., and the installation posture of the vertical shaft and its impeller, as well as the sliding gap between the impeller and casing liner, etc. can be maintained normally. Moreover, by being able to hold the pump properly in this way and by creating a seal between the support flange, adjustment tube, and mounting flange, the pump performance can be achieved as expected, and the pump performance can be prevented from deteriorating. In addition, adjustment of misalignment, which is considered to be relatively difficult among the aforementioned misalignment adjustments, can be done by separating the shaft support mounting side and liner mounting side, and adjusting the adjustment bolts in each circumferential direction. Since it can be adjusted by screwing forward and backward, the adjustment is easy and can be easily corrected to the correct position, which provides excellent practical effects. (Example) Hereinafter, an example of a large vertical shaft pump according to this invention will be described in detail with reference to FIGS. 2 and 3. Fig. 2 shows the parts on the shaft support mounting side, and Fig. 3 shows the parts on the liner mounting side. In each of these figures, the same reference numerals as in Fig. 1 are designated as
Indicates the same or equivalent parts. First, on the shaft support mounting side shown in FIG. 2, the shaft support mounting flange 3 has a "shaped" cross section. An adjustment tube 16 having an outer circumferential ring 17 facing the outer circumferential surface 10a of the support flange 10 is interposed so as to fit inside the mounting flange 3, and an O-ring is provided on the surface in contact with each flange 3, 10. 1
8 and 19 to seal between the inner and outer surfaces thereof. Therefore, the mounting flange 3 and the adjustment tube 16
This means that adjustment shims 20 are arbitrarily inserted between the two in the axial direction at multiple locations equiangularly spaced in the circumferential direction so as not to cause misalignment in the circumferential direction. The axial mounting position is adjusted and mounted with mounting bolts 21, and the support flange 10 and adjustment cylinder 16 are connected to the outer ring 1.
7, the tips of the adjusting bolts 22 screwed from the outside are placed in a plurality of positions equiangularly spaced in the circumferential direction so as to abut the corresponding positions on the support flange outer circumferential surface 10a, and by screwing each adjusting bolt 22 in and out, , the mounting position in the circumferential direction is adjusted and the mounting bolt 23 is used for mounting. That is, in this way, on the shaft support mounting side, the shaft support 7 can be mounted to the mounting flange 3 by finely adjusting its axial and circumferential mounting positions under the effect of internal and external sealing. Next, on the liner mounting side shown in FIG. 3, the liner mounting flange 4 also has a cross-sectional shape, and here too, there is a
Similarly, an adjustment tube 24 having a "shaped" cross section and an outer peripheral ring 25 facing the outer peripheral surface 13a of the support flange 13 is interposed so as to fit inside the mounting flange 4, and each flange 4, 1
O-rings 26 and 27 are provided on the surfaces in contact with 3 to seal between the inner and outer surfaces. Also, the mounting flange 4 and the adjustment tube 24
This means that the adjustment cylinder 24 is supported by the heads of the adjustment bolts 28 screwed from above at multiple locations equiangularly spaced in the circumferential direction on the four faces of the mounting flange, and each of these adjustment bolts The planting height of 28 is determined by screwing it forward and backward, and the axial mounting position is adjusted by tightening nuts 29, 29 at that position, and the support flange 1
3 and the adjustment cylinder 24 are arranged such that each tip of the adjustment bolt 30 threaded from the outside is abutted against a corresponding position on the support flange outer peripheral surface 13a at a plurality of positions equiangularly spaced in the circumferential direction on the outer ring 25 in the same manner as described above. The mounting position in the circumferential direction is adjusted by screwing each adjusting bolt 30 forward and backward. That is, in this way, even on the liner installation side, the casing liner is attached to the installation flange 4.
12 can be mounted by finely adjusting its axial and circumferential mounting positions under the effect of internal and external sealing, and each of these adjustments is mutually arranged in conjunction with the shaft support mounting side, As a result, it is possible to assemble and install the concrete casing in a manner that best suits the forming conditions of the concrete casing. In the above embodiment, the axial adjustment is performed by inserting an adjusting shim on the shaft support mounting side, and by threading the adjusting bolt on the liner mounting side.
Although these are performed separately by the retracting operation, they may be combined arbitrarily, for example, they may both be used as adjustment shims or adjustment bolts, or they may be used in the opposite manner.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the general configuration of a large vertical shaft pump, and Figures 2 and 3 are enlarged cross-sectional views of essential parts showing the shaft support and casing liner attachment part, respectively, to which an embodiment of this invented device is applied. be. 1 ...Casing formwork, 2...Water pipe, 3...
Shaft support mounting flange, 4... Liner mounting flange, 5... Concrete, 6... Vertical shaft, 7 ...
Shaft support, 8... Bearing device, 9... Shaft sealing device, 1
0, 13... Support flange, 11... Impeller, 1
2... Casing liner, 16 , 24 ... Adjustment tube, 17, 25... Outer ring, 18, 19, 2
6, 27... O-ring, 20... Adjustment shim, 2
2, 28, 30...adjustment bolt, 29...nut.

Claims (1)

[Scope of utility model registration request] A water conduit is taken out in the tangential direction from a part of the circumferential side, and the casing formwork has a spiral annular shape with a shaft support mounting flange above the open center side and a liner mounting flange below. Concrete is cast and hardened on the outer circumference of the formwork, and a shaft support for supporting and sealing the vertical shaft is attached to the shaft support mounting flange via a support flange protruding from the upper outer peripheral surface of the shaft support, and In a large vertical shaft pump in which a casing liner that faces the impeller at the bottom of the vertical shaft with a small gap is attached to the liner mounting flange via a support flange protruding from the outer circumferential surface of the casing liner, the liner mounting flange has a casing liner that faces the impeller at the bottom of the vertical shaft with a small gap between the support flange and the mounting flange. An adjustment cylinder having an outer circumferential ring facing the outer peripheral surface of the support flange and fitted to the mounting flange is interposed, and after sealing between them with an O-ring or the like, the connection between the mounting flange and the adjustment cylinder is made. Adjust each axial mounting position by inserting adjustment shims from multiple locations in the circumferential direction of the mounting flange, or by screwing in and out of each adjustment bolt that supports the adjustment tube by threading it into multiple locations in the circumferential direction of the mounting flange. Further, the mounting position in the circumferential direction can be adjusted by threading and retracting adjustment bolts that are screwed into multiple locations in the circumferential direction of the outer ring and abut against the outer circumferential surface of the support flange. Large vertical shaft pump.