Pump body structure of high-efficiency fire pump

Abstract

The utility model provides a kind of pump body structure of high efficiency fire pump, including volute and impeller, the volute has circular cavity, rotatable impeller is installed in cavity, main flow passage is arranged inside volute, main flow passage is communicated with volute water outlet, multiple water inlet flow passages are sequentially and interval arranged along the circumferential direction of the cavity, one end of the water inlet flow passage is communicated with the cavity, and the other end is communicated with the main flow passage. The pump body structure has the advantages of good flow, lift performance, high efficiency, maintenance-free, stable operation, etc.

Description

Technical Field

[0001] This utility model mainly relates to the field of water pump technology, specifically a pump body structure for a high-efficiency fire pump. Background Technology

[0002] Fire pumps are one of the most commonly used structures in fire protection equipment. The design of the fire pump's body structure directly affects its performance. Ensuring the pump's flow rate and head under certain power conditions is a key and challenging issue in fire pump design.

[0003] In current technology, fire pumps mostly adopt a structure of volute casing combined with closed or open impeller. The impeller is installed in a cavity inside the volute casing, and the flow channel inside the volute casing is completely connected to the cavity in the circumferential direction. Although this structure reduces the manufacturing difficulty of the pump, its flow rate and performance are limited. To increase the pump's performance, the pump size must be increased or the power input must be increased, resulting in problems such as excessive pump weight and high equipment cost.

[0004] In current technology, fire pumps are mostly connected to the power shaft using bearing support, which requires regular maintenance. Under high-speed operation, the bearings are prone to overheating. In gasoline engine fire pump structures, the engine is needed to drive the pump body at high speed, which can easily cause overheating. Although the pump body can provide high-pressure water flow, its structural design limits its application to engine cooling, resulting in a single functional limitation for the pump body. Utility Model Content

[0005] To address the shortcomings of current technology, this utility model combines existing technology and, based on practical applications, provides a pump body structure for a high-efficiency fire pump, which has advantages such as good flow rate and head performance, high efficiency, maintenance-free operation, and stable operation.

[0006] The technical solution of this utility model is as follows:

[0007] A pump body structure for a high-efficiency fire pump includes a volute and an impeller. The volute has a circular cavity, in which a rotatable impeller is installed. A main channel is provided inside the volute and is connected to the outlet of the volute. Multiple inlet channels are arranged at intervals along the circumference of the cavity. One end of each inlet channel is connected to the cavity and the other end is connected to the main channel.

[0008] Furthermore, the water inlet channel is arranged in an arc shape.

[0009] Furthermore, the impeller is a closed impeller.

[0010] Furthermore, the impeller includes multiple blades, and the blades form multiple impeller outlets on the circumferential surface of the impeller, through which water flows into the inlet channel.

[0011] Furthermore, the rear end face of the volute is provided with an installation plane, the front end face of the volute is provided with a water inlet connector, and a sealing ring is provided between the water inlet connector and the end face of the volute.

[0012] Furthermore, the impeller includes an integrally coaxial wheel body and a shaft segment. The shaft segment is used to connect the power shaft. Annular bosses are provided on both sides of the wheel body. Wear-resistant bushings are installed in the water inlet connector and the volute. The annular bosses are located inside the corresponding wear-resistant bushings and are clearance-fitted with the wear-resistant bushings.

[0013] Furthermore, a cooling return water port is provided on the water inlet connector, and a cooling water outlet is provided on the back of the volute, with the cooling water outlet communicating with the cavity of the volute.

[0014] Furthermore, the water inlet connector is equipped with a negative pressure extraction port and a negative pressure detection port.

[0015] Furthermore, the volute is provided with a drain outlet and a water pressure detection port, both of which are connected to the main channel.

[0016] Furthermore, fixed feet are provided on both sides of the bottom of the volute, and the volute outlet is provided on the top of the volute. There are two volute outlets, both of which are connected to the main channel.

[0017] The beneficial effects of this utility model are:

[0018] 1. In the pump body structure of this utility model, the volute is designed with multiple water inlet channels, so that the closed impeller is connected to the main flow channel through the water inlet channels. The water flow is guided through each water inlet channel and then converges into the main flow channel. After being guided through the main flow channel, it is discharged through the outlet. Compared with the traditional pump body structure that only has a main flow channel, it can increase the discharge head while ensuring the flow rate, thereby greatly improving the efficiency and performance of the pump body without increasing the pump body volume. This pump body structure is especially suitable for use in fire pumps.

[0019] 2. The closed impeller of this utility model, combined with the volute structure, improves the performance of the pump body. The closed impeller adopts a floating design and can be directly connected to the power shaft, which ensures the simplicity of the structure and makes the pump body maintenance-free.

[0020] 3. In the structural design of this utility model, the volute can be directly fixed to the engine, so that the engine and the pump body vibrate synchronously, ensuring the stable operation and service life of the fire pump, while shortening the installation distance in the axial direction of the pump body, making the fire pump design more compact.

[0021] 4. In the structure of this utility model, the cooling return port and the outlet on the pump body can realize water circulation, so the engine or other components that need cooling can be cooled through the water flow of the pump body itself, so that the function of the pump body is no longer singular. Attached Figure Description

[0022] Appendix Figure 1 The pump body has a three-dimensional structure. Figure 1 .

[0023] Appendix Figure 2 The pump body has a three-dimensional structure. Figure 2 .

[0024] Appendix Figure 3 This is a top view of the pump body structure.

[0025] Appendix Figure 4 for Figure 3 Cross-sectional view at point AA.

[0026] Appendix Figure 5 for Figure 3 Cross-sectional view at point BB.

[0027] Appendix Figure 6 This is a schematic diagram of the volute structure.

[0028] Appendix Figure 7 This is a schematic diagram of the impeller structure.

[0029] The following are the labels in the attached diagram: 1. Volute; 2. Inlet connector; 3. Impeller; 4. Cooling return port; 5. Negative pressure detection port; 6. Volute outlet; 7. Negative pressure extraction port; 8. Mounting plane; 9. Drain port; 10. Negative pressure detection port; 11. Cooling outlet; 12. Main flow channel; 13. Inlet flow channel; 14. Wear-resistant bushing; 15. Cavity; 16. Shaft section; 17. Wheel body; 18. Annular boss; 19. Blade; 20. Impeller outlet. Detailed Implementation

[0030] 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.

[0031] refer to Figures 1-7 The diagram shows the pump body structure of a high-efficiency fire pump provided in this embodiment. This pump body structure is mainly driven by a gasoline engine to rotate at high speed, drawing water from the inlet, pressurizing it, and then spraying it out from the outlet for fire extinguishing. This pump body structure ensures the water flow rate and head, improves pump performance, and is more conducive to fire extinguishing.

[0032] The pump body structure of this embodiment mainly includes a volute 1, an inlet connector 2, and an impeller 3.

[0033] The volute 1 has a circular cavity 15, within which a rotatable impeller 3 is installed. A main channel 12 is arranged circumferentially inside the volute 1, and the main channel 12 communicates with the volute outlet 6. Unlike conventional volutes, in this embodiment, multiple inlet channels 13 are arranged at intervals along the circumference of the cavity 15 of the volute 1. One end of each inlet channel 13 communicates with the cavity 15, and the other end communicates with the main channel 12. Specifically, in this embodiment, the inlet channels 13 are arc-shaped, with one end tangent to the impeller 3 as much as possible, and the other end tangent to the main channel 12 as much as possible.

[0034] In the specific structure of the impeller 3 provided in this embodiment, the impeller 3 adopts the closed impeller shown in the figure, which includes multiple blades 19. The blades 19 form multiple impeller outlets 20 on the circumferential surface of the impeller 3. After the water flows out through the impeller outlets 20, it enters the inlet channel 13 for guidance.

[0035] In the above structure of this embodiment, the water outlet of impeller 3 does not directly enter the main flow channel 12, but is first guided by the inlet flow channel 13, which has a guiding function, before entering the main flow channel 12. Specifically, during operation, the impeller 3 is driven to rotate at high speed by the engine. The impeller 3 pressurizes the water at the inlet connector 2 and the water flows into each inlet flow channel 13. After being guided in each inlet flow channel 13, the water flows into the main flow channel 12. After being guided again by the main flow channel 12, the water finally exits at high pressure through the volute outlet 6. Through the double guiding structure design, the pump performance is greatly improved, ensuring the flow rate and head at the outlet.

[0036] This embodiment also provides a pump body mounting structure. Specifically, a mounting plane 8 is provided on the rear end face of the volute 1, and mounting holes are provided circumferentially on the mounting plane 8. The pump body can be directly fixed to the engine through the mounting plane 8. The water inlet connector 2 is installed on the front end face of the volute 1, and a sealing ring is provided between the water inlet connector 2 and the front end face of the volute 1. Water is drawn in through the water inlet connector 2 under the action of the impeller 3, and after being pressurized by the impeller 3 and guided twice, it is finally discharged from the water outlet 6 at the top of the volute. In this embodiment, two water outlets 6 are provided on the volute to facilitate the simultaneous connection of two water hoses and improve the utilization rate of the pump body. At the same time, a negative pressure port 7 and a negative pressure detection port 5 are provided on the water inlet connector 2. Negative pressure is drawn in through the negative pressure port 7, and the negative pressure is detected through the negative pressure detection port 5. A drain port 9 and a water pressure detection port 10 are provided on the volute 1. A pressure relief valve is installed at the drain port 9, which automatically drains water when the set pressure is exceeded. The water pressure detection port 10 provides feedback on the internal water pressure of the pump body. Furthermore, fixed feet are provided on both sides of the bottom of the volute 1, and shock-absorbing columns can be installed on the lower part of the fixed feet to achieve shock absorption.

[0037] In this embodiment, the pump body adopts a maintenance-free design, with the impeller 3 designed to be directly connected to the engine output shaft. Simultaneously, the impeller 3 and the volute 1 employ a suspended structure design. Specifically, the impeller 3 includes an integrally coaxial wheel body 17 and a shaft section 16. The shaft section 16 is fitted onto the engine's power shaft, transmitting torque via a key connection. The engine's power is directly transmitted to the impeller 3 without the need for bearings or other structures. Annular bosses 18 are provided on both sides of the wheel body 17. Wear-resistant bushings 14 are installed in the water inlet connector 2 and inside the volute 1. The annular bosses 8 are located within the corresponding wear-resistant bushings 14 and are clearance-fitted with them. The hardness of the wear-resistant bushings 14 is less than that of the impeller 3. Under normal operation, the impeller 3 does not circumferentially contact the wear-resistant bushings 14. In special circumstances, when the impeller 3 experiences severe vibration or other eccentricities, its circumferential direction comes into contact with the wear-resistant bushings 14, causing wear on the wear-resistant bushings 14 and preventing damage to the impeller 3.

[0038] In this embodiment, by optimizing the pump body structure, the pump body can also provide cooling circulating water. For example, when the pump body is driven by the engine, the circulating cooling water can cool the engine. Specifically, a cooling return port 4 is provided on the water inlet connector 2, and a cooling outlet 11 is provided on the back of the volute 1. The cooling outlet 11 is connected to the cavity 15 of the volute 1. In actual use, a heat exchanger can be used. The engine coolant is connected to the heat exchanger, and the cooling return port 4 and the cooling outlet 11 are connected to the heat exchanger through pipelines. The cooling water provided by the pump body cools the coolant, thereby achieving cooling. Of course, the above cooling method is only one solution provided in this embodiment. The cooling return port 4 and the cooling outlet 11 provided by the pump body can provide circulating water flow and can also be used for other functions.

Claims

1. A pump body structure for a high-efficiency fire pump, comprising a volute and an impeller, wherein the volute has a circular cavity, a rotatable impeller is installed inside the cavity, and a main flow channel is provided inside the volute, the main flow channel being connected to the outlet of the volute, characterized in that, Multiple water inlet channels are arranged sequentially at intervals along the circumference of the cavity. One end of each water inlet channel is connected to the cavity, and the other end is connected to the main channel.

2. The pump body structure of the fire pump according to claim 1, characterized in that, The water inlet channel is arranged in an arc shape.

3. The pump body structure of the fire pump according to claim 1, characterized in that, The impeller is a closed impeller.

4. The pump body structure of the fire pump according to claim 3, characterized in that, The impeller includes multiple blades, and the blades form multiple impeller outlets on the circumferential surface of the impeller. Water flows into the inlet channel through the impeller outlets.

5. The pump body structure of the fire pump according to claim 1, characterized in that, The rear end face of the volute is provided with an installation plane, and the front end face of the volute is provided with a water inlet connector. A sealing ring is provided between the water inlet connector and the end face of the volute.

6. The pump body structure of the fire pump according to claim 5, characterized in that, The impeller includes an integrally coaxial wheel body and a shaft section. The shaft section is used to connect the power shaft. Annular bosses are provided on both sides of the wheel body. Wear-resistant bushings are installed in the water inlet connector and the volute. The annular bosses are located in the corresponding wear-resistant bushings and are clearance-fitted with the wear-resistant bushings.

7. The pump body structure of the fire pump according to claim 5, characterized in that, A cooling return water inlet is provided on the water inlet connector, and a cooling water outlet is provided on the back of the volute, with the cooling water outlet communicating with the cavity of the volute.

8. The pump body structure of the fire pump according to claim 5, characterized in that, The water inlet connector is equipped with a negative pressure extraction port and a negative pressure detection port.

9. The pump body structure of the fire pump according to claim 1, characterized in that, The volute is equipped with a drain outlet and a water pressure detection port, both of which are connected to the main channel.

10. The pump body structure of the fire pump according to claim 1, characterized in that, Fixed feet are provided on both sides of the bottom of the volute, and the volute outlet is provided on the top of the volute. There are two volute outlets, both of which are connected to the main channel.

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