Bearing box structure for horizontal centrifugal pump

Abstract

The utility model relates to the field of centrifugal pumps, in particular to a bearing box structure for a horizontal centrifugal pump, which comprises a first bearing box positioned at a driving end of a pump shaft and a second bearing box positioned at a non-driving end of the pump shaft. A plurality of heat dissipation grooves are formed in the end face of the end, away from the pump body, of the bearing support in the circumferential direction, and the two ends of each heat dissipation groove communicate with the inner side and the outer side of the bearing support. The bearing support is additionally arranged between the bearing box and the pump body, meanwhile, the thermal barrier type heat dissipation groove is formed in the end face of the bearing support, the heat conduction effect on the mechanical sealing position of the pump body is effectively reduced, and normal operation of a pump set is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pump equipment, in particular to a structure of a bearing box of a horizontal centrifugal pump. Background Art

[0002] In the prior art, in order to ensure the stability of a single-stage pump or a two-stage pump with high lift and large flow during operation, bearing boxes are provided at the driving end and the non-driving end of the pump shaft, and rolling bearings in interference fit with the pump shaft are arranged in the bearing boxes. During the operation of the pump set, the heat generated in the bearing box is mainly realized through the heat conduction of the pump body. Due to the compact and single structure of the traditional bearing box, the heat dissipation effect is poor, and the heat of the bearing box will be directly conducted to the mechanical seal of the pump body adjacent to it, thereby accelerating the thermal damage and failure of the mechanical seal, seriously affecting the safe and stable operation of the entire pump set. Summary of the Utility Model

[0003] To solve the deficiencies of the above prior art, the utility model provides a structure of a bearing box of a horizontal centrifugal pump.

[0004] The technical solution of the utility model is as follows: A structure of a bearing box for a horizontal centrifugal pump, including a first bearing box located at the driving end of the pump shaft and a second bearing box located at the non-driving end of the pump shaft. The first bearing box and the second bearing box are respectively connected to the pump body through bearing brackets. A plurality of heat dissipation grooves are arranged circumferentially on the end face of the bearing bracket away from the pump body, and both ends of the heat dissipation grooves are communicated with the inner and outer sides of the bearing bracket. By arranging a bearing bracket between the pump body and the bearing box, the heat generated by the bearings in the bearing box does not directly contact the pump body, and is extended to the outside of the pump through the bearing bracket. At the same time, a plurality of heat dissipation grooves are arranged on the end face of the bearing bracket connected to the bearing box to form a heat barrier between the bearing box and the bearing bracket, further reducing the area directly used for heat conduction on the bearing bracket and effectively reducing the heat conduction effect on the mechanical seal of the pump body.

[0005] The bottoms of the first bearing box and the second bearing box have oil storage cavities, and cooling water pipes for water cooling the oil storage cavities are arranged through the oil storage cavities. Radiating fins are integrally formed on the outer walls of the first bearing box and the second bearing box corresponding to the oil storage cavities. The cooling water pipes arranged through the bearing box, in cooperation with the radiating fins, accelerate the heat dissipation effect of the bearings.

[0006] The bearing bracket includes a first flange, a second flange and a plurality of reinforcing plates located between the first flange and the second flange. The reinforcing plates are arranged circumferentially and fixedly connected to the inner surfaces of the first flange and the second flange. The heat dissipation grooves are arranged on the outer surface of the first flange. The hollow bearing bracket composed of two flanges and reinforcing plates can ensure the heat dissipation effect while providing an installation window for the installation and disassembly of the mechanical seal.

[0007] The inner diameter of the first flange is greater than the outer diameter of the mechanical seal on the pump shaft.

[0008] A cooling fan is provided on the outer side of the second bearing housing. The rotating shaft of the cooling fan penetrates through the second bearing housing and is connected to the non-driving end of the pump shaft, and the outer side of the rotating shaft is in interference fit with the second bearing housing through a rolling bearing. The cooling fan assists in dissipating heat from the outer side of the second bearing housing, further improving the heat dissipation effect of the bearing housing structure.

[0009] The beneficial effects of the present utility model are as follows: In this solution, a bearing bracket is provided between the pump body and the bearing housing, so that the heat generated by the bearings in the bearing housing does not directly contact the pump body, and is extended outside the pump through the bearing bracket. At the same time, a number of heat dissipation grooves are arranged on the end face where the bearing bracket is connected to the bearing housing, forming a heat barrier between the bearing housing and the bearing bracket, further reducing the area directly used for heat conduction on the bearing bracket, and effectively reducing the heat conduction effect on the mechanical seal of the pump body. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the present utility model applied to a centrifugal pump;

[0011] Figure 2 is a schematic structural diagram of the bearing bracket in the present utility model;

[0012] Figure 3 is a side view of the first bearing housing in the present utility model.

[0013] Reference numerals: 1, pump body; 2, pump shaft; 201, mechanical seal; 3, first bearing housing; 301, oil storage cavity; 4, second bearing housing; 5, bearing bracket; 501, heat dissipation groove; 502, first flange; 503, second flange; 504, reinforcing plate; 6, cooling water pipe; 7, heat dissipation fin; 8, cooling fan; 9, protective cover. Detailed Embodiments

[0014] To enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the present utility model will be clearly and completely described below with reference to the drawings. Other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Such as Figure 1As shown in the figure, the utility model provides a bearing box structure for a horizontal centrifugal pump, which includes a first bearing box 3 at the driving end of the pump shaft 2 and a second bearing box 4 at the non-driving end of the pump shaft 2. A first rolling bearing in interference fit with the pump shaft 2 is fixed in the first bearing box 3, and a second rolling bearing in interference fit with the pump shaft 2 is fixed in the second bearing box 4. The positions where the first bearing box 3 and the second bearing box 4 are penetrated by the pump shaft 2 are sealed with the pump shaft 2 through a bearing isolator. The structure of the bearing isolator is the same as that of the prior art and will not be elaborated here. The first bearing box 3 and the second bearing box 4 are respectively connected to the pump body 1 through bearing brackets 5. A plurality of heat dissipation grooves 501 are arranged circumferentially on the end face of the end of the bearing bracket 5 far from the pump body 1, and both ends of the heat dissipation grooves 501 are communicated with the inner and outer sides of the bearing bracket 5. By arranging the bearing bracket 5 between the pump body 1 and the bearing box, the heat generated by the bearings in the bearing box does not directly contact the pump body 1 and is extended to the outside of the pump through the bearing bracket 5. At the same time, a plurality of heat dissipation grooves 501 are arranged on the end face where the bearing bracket 5 is connected to the bearing box, forming a heat barrier between the bearing box and the bearing bracket 5, further reducing the area directly used for heat conduction on the bearing bracket 5 and effectively reducing the heat conduction effect on the mechanical seal of the pump body.

[0016] As Figure 2 shown, the bearing bracket 5 of this embodiment includes a first flange 502, a second flange 503 and a plurality of reinforcing plates 504 located between the first flange 502 and the second flange 503. Each of the reinforcing plates 504 is arranged circumferentially and fixedly connected to the inner surfaces of the first flange 502 and the second flange 503. The heat dissipation grooves 501 are arranged on the outer surface of the first flange 502. The hollow bearing bracket 5 composed of two flanges and the reinforcing plates 504 can ensure the heat dissipation effect while providing an installation window for installing and disassembling the mechanical seal 201. Further preferably, for the convenience of directly disassembling and assembling the mechanical seal 201 from the first flange 502, the inner diameter of the first flange 502 is greater than the outer diameter of the mechanical seal 201 on the pump shaft 2.

[0017] In this embodiment, there are four reinforcing plates 504 on the bearing bracket 5, which are equally distributed on the bearing bracket 5 to ensure that the bearing bracket 5 has sufficient strength.

[0018] As Figure 1 and Figure 3 shown, the bottoms of the first bearing box 3 and the second bearing box 4 have oil storage cavities 301. A cooling water pipe 6 for water cooling the oil storage cavity 301 is penetrated in the oil storage cavity 301. Heat dissipation fins 7 are integrally formed on the outer walls of the first bearing box 3 and the second bearing box 4 corresponding to the oil storage cavity 301. The cooling water pipe 6 penetrating the bearing box, in cooperation with the heat dissipation fins 7, accelerates the heat dissipation effect of the bearings.

[0019] As Figure 1As shown in the figure, a cooling fan 8 is provided on the outer side of the second bearing housing. The rotating shaft of the cooling fan 8 penetrates through the second bearing housing and is connected to the non-driving end of the pump shaft 2. The outer side of the rotating shaft is in interference fit with the second bearing housing through a rolling bearing. The cooling fan 8 is used to assist in cooling the outer side of the second bearing housing, achieving the purpose of combined cooling of the finned cooling pipe and the fan. Preferably, a protective cover 9 for protecting the cooling fan 8 is further installed on the outer side of the second bearing housing.

[0020] Taking the single-stage pump as an example of the present utility model, this bearing housing structure is installed at the driving end and the non-driving end of the pump shaft 2. The finned cooling water pipe 6 and the cooling fan 8 rapidly dissipate heat from the bearing housing. The heat conducted out from the bearing housing is diffused to the outside of the pump through the hollow bearing support 5. At the same time, due to the existence of the heat dissipation grooves 501, the direct contact area between the bearing support 5 and the bearing housing is reduced. The specific heat capacity of air is much larger than that of the metal frame, so a thermal barrier is formed between the bearing housing and the bearing support 5, effectively reducing the direct heat conduction to the pump body 1 and slowing down the thermal damage failure speed of the mechanical seal 201, ensuring the normal operation of the pump set.

[0021] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A bearing box structure for a horizontal centrifugal pump, comprising a first bearing box located at a driving end of a pump shaft and a second bearing box located at a non-driving end of the pump shaft, characterized in that: The first bearing box and the second bearing box are connected to the pump body via bearing brackets respectively. A plurality of heat dissipation grooves are arranged circumferentially on the end surface of the bearing bracket away from the pump body. Both ends of the heat dissipation grooves are connected to the inner and outer sides of the bearing bracket.

2. A bearing box structure for a horizontal centrifugal pump according to claim 1, characterized in that: The first bearing box and the second bearing box have an oil storage cavity at the bottom, and a cooling water pipe for water cooling the oil storage cavity is provided through the oil storage cavity. Heat sinks are integrally formed on the outer walls of the first bearing box and the second bearing box corresponding to the oil storage cavity.

3. A bearing box structure for a horizontal centrifugal pump according to claim 1 or 2, characterized in that: The bearing support includes a first flange, a second flange and a plurality of reinforcing plates located between the first flange and the second flange. Each of the reinforcing plates is arranged circumferentially and fixedly connected to the inner surfaces of the first flange and the second flange. The heat dissipation groove is provided on the outer surface of the first flange.

4. A bearing box structure for a horizontal centrifugal pump according to claim 3, characterized in that: The inner diameter of the first flange is larger than the outer diameter of the mechanical seal on the pump shaft.

5. The bearing box structure for a horizontal centrifugal pump according to claim 3, characterized in that: A cooling fan is arranged outside the second bearing box, a rotating shaft of the cooling fan passes through the second bearing box and is connected to the non-driving end of the pump shaft, and the outer side of the rotating shaft is interference-fitted with the second bearing box via a rolling bearing.

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