Short-shaft motorized fire pump

Abstract

The utility model provides a kind of short shaft motor-driven fire pump, including installation base, crankcase and pump body, the crankcase includes box and power shaft, the pump body includes pump shell and impeller, further include lengthening assembly, the lengthening assembly includes sleeve, bearing, lengthening shaft and coupling, one end of the sleeve is fixed on box and power shaft is inserted into sleeve, the coupling, bearing and lengthening shaft coaxially set in the inside of sleeve, lengthening shaft is supported by the bearing, and its one end is connected with the power shaft by the coupling, the other end installs the impeller, the pump shell is fixed on the other end of the sleeve. The fire pump can connect the crankcase with short output shaft by extending shaft structure, and the structure is compact and stable.

Description

Technical Field

[0001] This utility model mainly relates to the technical field of water pumps, specifically a short-shaft motorized fire pump. Background Technology

[0002] Fire pumps are one of the most commonly used structures in firefighting equipment. Motorized fire pumps are a type of fire pump, widely used in various fire and rescue operations due to their portability.

[0003] The main structure of a mobile fire pump consists of a gasoline engine (crankcase) driving an impeller in the pump body to achieve high-pressure water pumping. Therefore, the engine's performance has a decisive impact on the fire pump. In existing technologies, engines can be customized, but this involves high technical complexity and significantly increases costs. Using existing mature engines often results in mismatched crankshafts, preventing a proper connection with the pump body. For example, the engine output shaft (crankshaft) may extend too shortly out of the crankcase, making direct connection to the impeller impossible. In such cases, directly customizing the crankshaft is costly and cannot guarantee performance. Therefore, a connection structure suitable for short output shaft crankcases is needed to facilitate matching tests or final product design between the crankcase and the pump body. Utility Model Content

[0004] To address the shortcomings of current technology, this utility model, based on existing technology and practical application, provides a short-shaft motorized fire pump. Through an extended shaft structure, the pump body can be connected to a crankcase with a short output shaft, and the structure is compact and has good stability.

[0005] The technical solution of this utility model is as follows:

[0006] A short-shaft motorized fire pump includes a mounting base, a crankcase, and a pump body. The crankcase includes a housing and a drive shaft. The pump body includes a pump casing and an impeller. It also includes an extension assembly. The extension assembly includes a sleeve, a bearing, an extension shaft, and a coupling. One end of the sleeve is fixed to the housing, and the drive shaft extends into the sleeve. The coupling, bearing, and extension shaft are coaxially arranged inside the sleeve. The extension shaft is supported by the bearing, and one end of it is connected to the drive shaft through the coupling. The other end is fitted with the impeller. The pump casing is fixed to the other end of the sleeve.

[0007] Furthermore, the sleeve includes a coupling sleeve section and a bearing sleeve section, which are connected by screws.

[0008] Furthermore, one end of the coupling sleeve section is connected to the housing via a flange and screws, and the other end is connected to the bearing sleeve section via a flange and screws, with the coupling disposed inside the coupling sleeve section.

[0009] Furthermore, the bearing is installed on the bearing sleeve section, one end of which is provided with a flange for connection to the coupling sleeve, and the other end is provided with a flange for installing the pump casing.

[0010] Furthermore, the extended shaft is provided with a shaft end limiting platform for limiting one end of the bearing inner ring, and the other end of the bearing inner ring is limited by a round nut installed on the extended shaft.

[0011] Furthermore, a sleeve end limiting platform is provided inside the bearing sleeve section for limiting one end of the bearing outer ring, and the other end of the bearing outer ring is limited by a spacer.

[0012] Furthermore, one end of the spacer is pressed against the outer ring of the bearing, and the other end extends into the coupling sleeve section and is pressed against the stop plate inside the coupling sleeve section.

[0013] Furthermore, the bearing is an angular contact ball bearing arranged back-to-back.

[0014] The beneficial effects of this utility model are:

[0015] 1. The short-shaft motorized fire pump designed in this utility model can extend the crankcase output shaft of the short output shaft through the extension component, so as to facilitate the connection of the pump body impeller to the output end of the crankshaft. In the structure, the reasonable cooperation of the sleeve, coupling and bearing not only ensures the compactness of the structure, but also ensures the stability of the fire pump during operation.

[0016] 2. In this utility model, the sleeve is divided into two parts, which facilitates the disassembly and assembly of the equipment. The bearings are selected as back-to-back angular contact bearings, which can simultaneously bear radial and axial loads, ensuring the efficient and stable operation of the fire pump.

[0017] 3. In this utility model, the spacer can be used for both limiting the bearing and for coaxiality positioning between the two sleeve sections. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the overall structure of a mobile fire pump.

[0019] Appendix Figure 2 This is a schematic diagram of the extended components and pump body assembly structure.

[0020] Appendix Figure 3 This is an internal sectional view of the extended assembly and pump body.

[0021] Appendix Figure 4 This is an extended internal sectional view of the component.

[0022] Appendix Figure 5 This is a schematic diagram of the split state of the extended component.

[0023] The following are the reference numerals in the attached diagram: 1. Crankcase; 2. Extended assembly; 3. Pump body; 4. Power shaft; 21. Coupling; 22. Coupling sleeve section; 23. Extended shaft; 24. Bearing sleeve section; 25. Bearing; 26. Spacer; 27. Round nut; 31. Impeller; 32. Pump casing. Detailed Implementation

[0024] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0025] This embodiment provides a short-shaft motorized fire pump. In this motorized fire pump, "short shaft" refers to a relatively short crankshaft extension from the crankcase. Therefore, a reasonable extension shaft design solves the problem of the pump body not being able to be installed. Since directly customizing a long crankshaft makes it impossible to determine the matching performance between the pump body and the engine, this solution allows for stable connection between the pump body and the engine before data testing. Of course, this solution is also applicable to the finished structure of fire pumps.

[0026] refer to Figures 1-5 As shown, the mobile fire pump in this embodiment mainly includes a mounting base, a crankcase 1, and a pump body 3. The crankcase 1 includes a housing and a power shaft 4, which serves as the crankshaft to provide power to the engine. The pump body 3 includes a pump casing 32 and an impeller 31. The impeller 31 is rotatably mounted within the pump casing 32, and water pumping is achieved through the rotation of the impeller 31. Because the portion of the power shaft 4 extending beyond the housing is relatively short, an extension component 2 is added in this embodiment to ensure a stable connection between the impeller 31 and the power shaft 4.

[0027] Referring to the figure, the extended assembly 2 in this embodiment includes a sleeve, a bearing 25, an extended shaft 23, and a coupling 21. The sleeve mainly consists of a coupling sleeve section 22 and a bearing sleeve section 24. Specifically, one end of the coupling sleeve section 22 has a flange and several mounting holes. The coupling sleeve section 22 is fixed to the end face of the crankcase 1 by screws and the flange, with the protruding portion of the power shaft 4 located inside the coupling sleeve section 22. The bearing sleeve section 24 is detachably connected to the coupling sleeve section 22 by a flange and screws, allowing the bearing 25 to be installed inside the bearing sleeve section 24. The extended shaft 23 is supported by the bearing 25, with one end connected to the power shaft 4 via the coupling 21, and the other end fitted with an impeller 31. The coupling 21 transmits power from the power shaft 4 to the extended shaft 23, which in turn drives the impeller 31 to rotate.

[0028] In this embodiment, there are two bearings 25 arranged side by side, using angular contact bearings and installed back to back, so that the bearings 25 can not only withstand radial force but also bidirectional axial force, ensuring the stable operation of the fire pump under complex working conditions.

[0029] In this embodiment, the sleeve is designed as two detachable parts: the coupling sleeve section 22 and the bearing sleeve section 24, which facilitates the disassembly, assembly, and processing of the equipment. Referring to the figure, the bearing sleeve section 24 is designed with a tapered structure. The end that connects to the coupling sleeve section 22 is smaller, while the other end, where the pump housing 32 is mounted, is larger, ensuring smooth installation while reducing the overall size and weight. The internal cavity diameter of the coupling sleeve section 22 is slightly larger than that of the coupling 21 to avoid interference. The bearing sleeve section 24 has a bearing mounting cavity inside, and a limiting step is provided at the end near the pump body 3 to limit the outer ring of the bearing 25. A limiting step is also provided at the end of the extended shaft 23 away from the pump body 3 to limit the inner ring of the bearing 25. A round nut 27 is provided at the other end of the bearing 25 to limit the other end of the inner ring. A separate spacer 26 is also provided to limit the other end of the outer ring of the bearing 25.

[0030] With the above structure, during installation, first install the bearing 25 on the extended shaft 23 and lock it with the round nut 27. Then, install one end of the coupling 21 on the power shaft 4 and the extended shaft 23 on the other end of the power shaft 4. Next, install the spacer 26 inside the coupling sleeve section 22 and tighten it against the positioning table. Then, install the bearing sleeve section 24 to the coupling sleeve section 22, and finally install the impeller 31 and the pump casing 32.

[0031] After the above structure is connected, the power shaft 4 drives the impeller 31 to rotate, and the bearing 25 supports the extended shaft 23, ensuring the efficient and stable operation of the equipment, and making the whole assembly and disassembly convenient.

Claims

1. A short-shaft motorized fire pump, comprising a mounting base, a crankcase, and a pump body, wherein the crankcase includes a housing and a drive shaft, and the pump body includes a pump casing and an impeller, characterized in that, It also includes an extension assembly, which includes a sleeve, a bearing, an extension shaft, and a coupling. One end of the sleeve is fixed to the housing and the power shaft extends into the sleeve. The coupling, the bearing, and the extension shaft are coaxially arranged inside the sleeve. The extension shaft is supported by the bearing, one end of which is connected to the power shaft through the coupling, and the other end is fitted with the impeller. The pump casing is fixed to the other end of the sleeve.

2. The short-shaft motorized fire pump according to claim 1, characterized in that, The sleeve includes a coupling sleeve section and a bearing sleeve section, which are connected by screws.

3. The short-shaft motorized fire pump according to claim 2, characterized in that, One end of the coupling sleeve section is connected to the housing via a flange and screws, and the other end is connected to the bearing sleeve section via a flange and screws. The coupling is installed inside the coupling sleeve section.

4. The short-shaft motorized fire pump according to claim 3, characterized in that, The bearing is installed on the bearing sleeve section. One end of the bearing sleeve section is provided with a flange for connection to the coupling sleeve, and the other end is provided with a flange for installing the pump casing.

5. The short-shaft motorized fire pump according to claim 2, characterized in that, The extended shaft is equipped with a shaft end limiting platform for limiting one end of the bearing inner ring, and the other end of the bearing inner ring is limited by a round nut installed on the extended shaft.

6. The short-shaft motorized fire pump according to claim 5, characterized in that, The bearing sleeve section is equipped with a sleeve end limiting platform for limiting one end of the bearing outer ring, and the other end of the bearing outer ring is limited by a spacer.

7. The short-shaft motorized fire pump according to claim 6, characterized in that, One end of the spacer is pressed against the outer ring of the bearing, and the other end extends into the coupling sleeve section and is pressed against the stop plate inside the coupling sleeve section.

8. The short-shaft motorized fire pump according to claim 1, characterized in that, The bearing is an angular contact ball bearing arranged back-to-back.

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