Small-sized anti-seismic horizontal split double-suction fire pump

Abstract

The application discloses a small-sized horizontal double-suction fire pump with a middle opening and capable of resisting earthquakes, which directly transmits the load of a bearing assembly to a base, reduces the load required to be borne by a pump body, balances the radial force of the water pump by adopting a double-volute design, and makes the suction water flow more smooth by adopting a large taper water distribution rib design. The technical scheme comprises a base and a pump body. The pump body is composed of a pump base and a pump cover. A double-volute structure is formed between the pump base and the pump cover. Impeller shaft seats are fixedly arranged on the two sides of the pump base. An impeller shaft is arranged in the impeller shaft seats. An impeller on the impeller shaft is arranged at the center position of the pump body. Double-suction water channels and drainage channels are formed between the impeller and the pump body. The base, the pump base and a shaft end assembly support are fixedly connected into an integrated structure through a through rib. A bearing assembly is arranged on the bearing assembly support. A bearing seat in the bearing assembly and the bearing assembly support are provided with a male and female stop.

Description

Technical Field

[0001] This invention relates to the field of industrial water pump technology, and in particular to a small, stack-resistant, horizontal, split-case, double-suction fire pump. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In integrated small modular reactor (SMR) nuclear power projects, due to process factors, it is not possible to install elevated water tanks, and only fire pumps can be used; the diesel generators throughout the plant are also not earthquake-resistant, so only earthquake-resistant diesel engine-driven fire pump sets can be used to meet the regulatory requirements for providing fire water to the safe shutdown equipment area after an SSE earthquake.

[0004] Currently, there are no earthquake-resistant diesel engine-driven fire pump sets on the market. Diesel engine-driven fire pump sets mainly consist of a small reactor earthquake-resistant diesel engine, a small reactor horizontal single-suction fire pump, and a control system. Patent number CN220134304U discloses an earthquake-resistant fire pump, but this type of fire pump is a single-suction fire pump with an anti-vibration rod. Its water intake efficiency is low and cannot meet the needs of small reactor nuclear power projects. Therefore, the small reactor horizontal single-suction fire pump has the problems of low water intake efficiency and inability to achieve earthquake resistance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a small, earthquake-resistant, horizontal, split-case, double-suction fire pump. By directly transferring the load of the bearing assembly to the base, the load that the pump body needs to bear is reduced, ensuring the safe operation of the pump body during SSE earthquakes. The double volute design can balance the pump's radial force, and the large-tapered water distribution rib design of the suction chamber makes the water flow into the pump smoother. At the same time, by changing the structure of the sealing ring, the impeller's operational stability is improved.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] This invention provides a small, earthquake-resistant, horizontal, split-case, double-suction fire pump, including a base, pump body, impeller shaft, and shaft end assembly support;

[0008] The pump body consists of two parts: a pump base and a pump cover. The pump base is fixedly mounted on the base, and the pump cover is mounted on top of the pump base. A structure similar to a double volute is formed between the pump base and the pump cover. Impeller shaft seats are fixedly mounted on both sides of the pump base, and an impeller shaft is mounted in the impeller shaft seat. The impeller on the impeller shaft is arranged at the center of the pump body. Blades are provided on both sides of the impeller. A double suction channel and a drainage channel are formed between the impeller and the body. The base, pump base, and shaft end assembly support are fixedly connected as a whole structure by through ribs. A bearing assembly is mounted on the bearing assembly support. Bearing assembly supports and bearing assemblies are provided on both sides of the pump body. The impeller shaft is installed in the bearing assembly. The bearing seat in the bearing assembly and the bearing assembly support are engaged by a long stop and double locating pins and connected by fasteners.

[0009] Furthermore, the drainage channel is located in the middle of the double water intake channel.

[0010] Furthermore, the pump cover in the dual suction channel is provided with a large-tapered guide rib to guide water into the drainage channel.

[0011] Furthermore, the drainage channel is provided with a water-dividing tongue structure, which divides the drainage channel into two channels, so that the water in the upper part of the pump base reaches the outlet of the drainage channel along the water-dividing tongue, and the water in the lower part of the pump base is directly discharged along the outlet of the drainage channel.

[0012] Furthermore, a sealing ring seat is provided inside the pump base and pump cover. The sealing ring seat is located between the drainage channel and the double suction channel. A sealing ring is provided in the sealing ring seat, and the outer circular surface of the sealing ring and the sealing ring seat are engaged through a male and female stop.

[0013] Furthermore, the inner circular surface of the sealing ring adopts a labyrinth design, and a sealing ring bracket is provided on the impeller. The sealing ring bracket cooperates with the inner circular surface of the sealing ring to seal the communication gap between the drainage channel and the double suction channel except at the blade.

[0014] Furthermore, the bearing assembly also includes a bearing end cover, a bearing, and a radiator. The bearing is installed in a bearing housing, the bearing end cover is detachably connected to one side of the bearing housing, and the other side of the bearing housing is provided with a through hole for installing the impeller shaft. The radiator is located above the bearing end cover.

[0015] Furthermore, a packing, a packing gland, and a bushing are provided between the impeller shaft seat and the impeller shaft. The packing is arranged close to the impeller shaft seat, and a bushing is provided between the packing and the impeller shaft. The packing gland is fixedly connected to the outside of the pump seat and the pump cover.

[0016] Furthermore, an impeller is provided at the center of the impeller shaft, and both ends of the impeller shaft are respectively installed in the bearing assembly, with one end extending to provide a power input shaft head for the impeller shaft.

[0017] Furthermore, a flushing channel is provided on the impeller shaft seat; a water outlet is provided on the top of the pump cover, a four-way connecting valve is provided above the water outlet, a water pressure gauge is installed above the four-way connecting valve, and the two horizontal ports of the four-way connecting valve are respectively connected to the flushing channel on the shaft sleeve and the impeller shaft seat through flushing pipes.

[0018] The beneficial effects of the present invention are as follows:

[0019] This invention integrates the base, pump seat, and shaft end assembly support into a single structure, enhancing the overall stability of the pump body, increasing its overall strength and rigidity, and strengthening the reliability of impeller shaft support, thus ensuring the safe operation of the pump body during SSE earthquakes. The bearing seat and bearing assembly support are connected by a male-female stop fit and fastened, increasing the constraint on the impeller shaft and controlling the horizontal and vertical directions when the fire pump vibrates. The pump body adopts a double volute structure with blades on both sides of the impeller, and the radial and axial loads cancel each other out, making the impeller shaft run more smoothly. The impeller shaft seat on the pump body is only used for positioning, ensuring that the pump body does not bear excessive load during large vibrations and maintaining the integrity of the fire pump.

[0020] This invention divides the drainage channel into two channels, allowing water from the upper part of the pump base to reach the outlet of the drainage channel along the dividing tongue, while water from the lower part of the pump base is directly discharged through the outlet of the drainage channel, effectively improving the drainage efficiency of the drainage channel. The sealing ring seat and the sealing ring are fitted with a male and female stop joint to improve positioning accuracy, ensure the operating clearance between the impeller shaft and the sealing ring, and make the operation more stable. The labyrinth design of the inner circular surface of the sealing ring, combined with the sealing ring bracket, reduces mutual leakage of liquid in the drainage channel and the double suction channel, improving the pump efficiency. A bushing is set between the impeller shaft seat and the impeller shaft, and a water film is formed through the flushing channel to prevent wear between the impeller shaft and the bushing. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a cross-sectional view of the double-suction fire pump in this invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the drainage pipe of the double-suction fire pump in this invention; Figure 3 This is a schematic diagram of the internal structure of the double-suction channel of the double-suction fire pump in this invention.

[0024] In the diagram: 1. Impeller shaft; 2. Bearing housing; 3. Shaft sleeve; 4. Flushing pipe; 5. Pump cover; 6. Impeller; 7. Sealing ring; 8. Pump base; 9. Packing gland; 10. Radiator; 11. Bearing; 12. Base; 13. Sealing ring seat; 14. Through rib; 15. Packing; 16. Bearing end cover; 17. Bearing assembly support; 18. Water divider tongue; 19. Drainage channel; 20. Water divider rib; 21. Double suction channel. Detailed Implementation

[0025] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] This invention discloses a small, earthquake-resistant, horizontal, split-case, double-suction fire pump, such as... Figures 1-3 As shown, the pump includes a pump body, an impeller shaft 1, a base 12, and a shaft end assembly support. The pump body consists of two parts: a pump seat 8 and a pump cover 5. The pump seat 8 is fixedly mounted on the base 12, and the pump cover 5 is mounted on top of the pump seat 8. A structure similar to a double volute is formed between the pump seat 8 and the pump cover 5. Impeller shaft 1 seats are fixedly mounted on both sides of the pump seat 8, and impeller shafts 1 are mounted in the impeller shaft 1 seats. Impellers 6 on the impeller shafts 1 are arranged at the center of the pump body, and blades are provided on both sides of the impeller 6. The impeller 6 forms a double suction channel 21 and a drainage channel 19 between itself and the pump body; the base 12, pump seat 8 and shaft end assembly support are fixedly connected as a whole by through ribs 14; a bearing assembly is provided on the bearing assembly support 17; bearing assembly supports 17 and bearing assemblies are provided on both sides of the pump body; the impeller shaft 1 is installed in the bearing assembly; the bearing seat 2 in the bearing assembly and the bearing assembly support 17 are engaged by a long stop and double locating pins and connected by fasteners.

[0028] In the pump base 8, the drainage channel 19 is arranged in the middle of the double suction channel 21; the pump cover 5 in the double suction channel 21 is provided with a large-tapered guide and water-dividing rib 20, which makes the water flow between the impeller 6 and the suction channel smoother, reduces the generation of vortices and flow separation, thereby reducing the vibration and noise of the pump operation; the pump casing adopts a double volute structure design, which makes the radial forces generated by the impeller 6 during water suction mutually cancel each other, making the rotor more stable during operation; the drainage channel 19 is provided with a water-dividing tongue 18 structure, which divides the drainage channel 19 into two channels, so that the water in the upper part of the pump base 8 reaches the outlet of the drainage channel 19 along the water-dividing tongue 18, and the water in the lower part of the pump base 8 is directly discharged along the outlet of the drainage channel 19, which effectively improves the drainage efficiency of the drainage channel 19.

[0029] A sealing ring seat 13 is provided inside the pump base 8 and the pump cover 5. The sealing ring seat 13 is located between the drainage channel 19 and the double suction channel 21. A sealing ring 7 is provided in the sealing ring seat 13. The outer circular surface of the sealing ring 7 and the sealing ring seat 13 are fitted together by a male and female stop, which effectively improves the positioning accuracy between the sealing ring 7 and the sealing ring seat 13 and better ensures the operating clearance between the impeller shaft 1 and the sealing ring 7, resulting in smoother operation. The inner circular surface of the sealing ring 7 adopts a labyrinth design. A sealing ring 7 bracket is provided on the impeller 6. The sealing ring 7 bracket fits with the inner circular surface of the sealing ring 7 to seal the communication gap between the drainage channel 19 and the double suction channel 21 except at the blade, effectively reducing the mutual leakage of liquid in the drainage channel 19 and the double suction channel 21 and improving the efficiency of the water pump.

[0030] The bearing assembly is mounted on the bearing assembly support 17. The bearing housing 2 in the bearing assembly is engaged with the bearing assembly support 17 through a long stop and double locating pins, and connected by fasteners to increase the constraint on the impeller shaft 1 and add control in the horizontal and vertical directions when the fire pump vibrates. The bearing assembly also includes a bearing end cover 16, a bearing 11, and a radiator 10. The bearing 11 is installed in the bearing housing 2. The bearing end cover 16 is detachably connected to one side of the bearing housing 2. The other side of the bearing housing 2 is provided with a through hole for installing the impeller shaft 1. The radiator 10 is located above the bearing end cover 16 to prevent the bearing 11 from overheating due to excessive rotational speed.

[0031] A packing 15, a packing gland 9, and a bushing 3 are provided between the impeller shaft 1 seat and the impeller shaft 1. The packing 15 is arranged close to the impeller shaft 1 seat, and the bushing 3 is provided between the packing 15 and the impeller shaft 1. The packing gland 9 is fixedly connected to the outside of the pump base 8 and the pump cover 5. A flushing channel is provided on the impeller shaft 1 seat. Water forms a water film between the impeller shaft 1 and the bushing 3 to isolate the impeller shaft 1 and the bushing 3, thereby preventing wear between the impeller shaft 1 and the bushing 3 during rotation in the pump body.

[0032] An impeller 6 is positioned at the center of the impeller shaft 1. Both ends of the impeller shaft 1 are respectively installed in the bearing assembly, with one end extending to form a power input shaft head for connecting to an external power source. The impeller shaft 1 is rotatably sleeved in the bushing 3 between the bearing assembly and the impeller 6, and can rotate relative to the bushing 3. This ensures that all loads during the operation of the drive shaft are borne by the bearing assemblies at both ends of the impeller shaft 1, making the impeller shaft 1 seat on the pump body only for positioning. Furthermore, blades are provided on both sides of the impeller 6, allowing the radial and axial loads during the rotation of the impeller 6 to cancel each other out. This ensures that the pump body does not bear excessive loads during significant vibrations, maintaining the integrity of the entire fire pump during such conditions.

[0033] The pump cover 5 has a water outlet at its top, and a four-way connecting valve is installed above the water outlet. A water pressure gauge is installed above the four-way connecting valve. The two horizontal ports of the four-way connecting valve are connected to the packing gland 9 and the flushing channel on the impeller shaft 1 seat through the flushing pipe 4, respectively. The water pressure in the drainage channel 19 ensures that there is no wear between the impeller shaft 1 seat and the bushing 3.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A small, earthquake-resistant, horizontal, split-case, double-suction fire pump, characterized in that, Includes base, pump body, impeller shaft, and bearing assembly support; The pump body consists of two parts: a pump base and a pump cover. The pump base is fixedly mounted on the base, and the pump cover is mounted on top of the pump base. A structure similar to a double volute is formed between the pump base and the pump cover. Impeller shaft seats are fixedly mounted on both sides of the pump base. An impeller shaft is mounted in the impeller shaft seat. An impeller on the impeller shaft is arranged at the center of the pump body. Blades are mounted on both sides of the impeller. A double suction channel and a drainage channel are formed between the impeller and the body. The pump base and pump cover are provided with a sealing ring seat inside. The sealing ring seat is located between the drainage channel and the double suction channel. The sealing ring seat is provided with a sealing ring. The outer circular surface of the sealing ring and the sealing ring seat are engaged by a male and female stop. The inner circular surface of the sealing ring adopts a labyrinth design, and a sealing ring bracket is provided on the impeller. The sealing ring bracket cooperates with the inner circular surface of the sealing ring to close the communication gap between the drainage channel and the double suction channel except at the blade. The base, pump base, and bearing assembly support are fixedly connected as an integral structure by through ribs. The bearing assembly support is provided with a bearing assembly. Both sides of the pump body are provided with bearing assembly supports and bearing assemblies. The impeller shaft is installed in the bearing assembly. The bearing seat in the bearing assembly and the bearing assembly support are engaged by a long stop and double locating pins and connected by fasteners. An impeller is positioned at the center of the impeller shaft, and both ends of the impeller shaft are respectively installed in the bearing assembly. One end extends to provide the power input shaft head of the impeller shaft. The impeller shaft is rotatably sleeved in the bushing between the bearing assembly and the impeller, and can rotate relative to the bushing. This ensures that the load during the operation of the drive shaft is entirely borne by the bearing assemblies at both ends of the impeller shaft, so that the impeller shaft seat on the pump body is only used for positioning. At the same time, blades are provided on both sides of the impeller, and the radial and axial loads during the rotation of the impeller can cancel each other out, ensuring that the pump body does not bear excessive loads during large vibrations. The pump cover in the dual suction channel is equipped with a large-tapered guide rib to guide water into the drainage channel; The drainage channel is equipped with a water divider tongue, which divides the drainage channel into two channels, so that the water in the upper part of the pump base reaches the outlet of the drainage channel along the water divider tongue, and the water in the lower part of the pump base is discharged directly along the outlet of the drainage channel.

2. The small, earthquake-resistant, horizontal, split-case, double-suction fire pump as described in claim 1, characterized in that, The drainage channel is located in the middle of the double water intake channel.

3. A small, earthquake-resistant, horizontal, split-case, double-suction fire pump as described in claim 1, characterized in that, The bearing assembly also includes a bearing end cover, a bearing, and a radiator. The bearing is installed in a bearing housing. The bearing end cover is detachably connected to one side of the bearing housing. The other side of the bearing housing is provided with a through hole for installing an impeller shaft. The radiator is located above the bearing end cover.

4. A small, earthquake-resistant, horizontal, split-case, double-suction fire pump as described in claim 1, characterized in that, The impeller shaft seat and the impeller shaft are provided with packing, a packing gland and a bushing. The packing is arranged close to the impeller shaft seat, and the bushing is provided between the packing and the impeller shaft. The packing gland is fixedly connected to the outside of the pump seat and the pump cover.

5. A small, earthquake-resistant, horizontal, split-case, double-suction fire pump as described in claim 4, characterized in that, The impeller shaft seat is provided with a flushing channel; the top of the pump cover is provided with a water outlet, a four-way connecting valve is provided above the water outlet, a water pressure gauge is installed above the four-way connecting valve, and the two horizontal ports of the four-way connecting valve are respectively connected to the flushing channel on the shaft sleeve and the impeller shaft seat through flushing pipes.

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