CN216044632U

CN216044632U - Double suction fire pump suction chamber structure

Info

Publication number: CN216044632U
Application number: CN202122707870.0U
Authority: CN
Inventors: 蒋敦军; 张世朋; 杨小雄; 高建梅; 周坤
Original assignee: Hunan Credo Pump Co ltd
Current assignee: Hunan Credo Pump Co ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-03-15
Anticipated expiration: 2031-11-04

Abstract

The utility model relates to a water suction chamber structure of a double-suction fire pump, which comprises two semi-spiral water suction chambers which are axially and symmetrically arranged, wherein each water suction chamber is provided with an inlet and two outlets; the water suction chamber is internally provided with a flow dividing structure with a streamline section, and the flow dividing structure is arranged on the intersection section of the water suction chamber and the water pressing chamber. The utility model has simple structure and low casting difficulty, and greatly reduces the cost and the weight of the pump; the utility model arranges the flow dividing structure in the water suction chamber, greatly improves the cavitation performance of the water suction chamber, improves the efficiency of the water pump, meets the use requirement and has higher application value.

Description

Double suction fire pump suction chamber structure

Technical Field

The utility model relates to a double-suction fire pump, in particular to a water suction chamber structure of the double-suction fire pump.

Background

The double-suction fire pump is one of centrifugal fire pumps, has the obvious characteristics of large flow, high lift, stable operation and the like, and is widely applied to industrial and agricultural production. The double-suction fire pump consists of main flow passage components such as a water suction chamber, a water pumping chamber, a double-suction impeller and the like. As is well known, the performance of fire pump products is pursued as a "steady" character, which requires the product to be able to start quickly and operate safely at any time. Therefore, the design standard of the fire pump has strict requirements on the performances of the product such as cavitation performance, power inflection point, hump in small flow area and the like, and the cavitation performance of the product is critical, and besides the impeller is more critical, the water suction chamber plays a role in lifting.

The water suction chamber of the double-suction fire pump refers to an overflowing part from a pump inlet flange to a double-suction impeller inlet. The function of the suction chamber is to introduce liquid into the impeller as required by the design. The liquid flow speed in the water suction chamber is relatively low, so the water loss is much smaller than that of the water pressing chamber, but the flow state in the water suction chamber directly influences the flow condition in the impeller, has certain influence on the efficiency of the pump and particularly has great influence on the cavitation performance of the anti-cavitation pump. The requirements on the water absorption chamber in engineering application are as follows: the impeller inlet is ensured to have a required speed field, such as uniform speed distribution, proper size and proper direction, and most importantly, the hydraulic loss is small.

The traditional double-suction fire pump comprises a semi-spiral water suction chamber 1, a water pumping chamber 2 and an intersecting section 3 of the water suction chamber and the water pumping chamber which are axially and symmetrically arranged, and the structural form of the matching position of the water suction chamber 1 and the water pumping chamber 2 of the traditional double-suction fire pump is shown in figure 2. The cross-sectional structure of the pumping chamber 2 has three structural forms of fig. 2a (rectangular cross-sectional structure 3.1 a), fig. 2b (trapezoidal cross-sectional structure 3.1 b) and fig. 2c (circular cross-sectional structure 3.1 c). For the three structures, liquid is sucked from the inlet flange in the water suction chamber 1, and is divided into two liquid flows at the matching position of the water suction chamber 1 and the water pressing chamber 2 to respectively enter two inlets of the double-suction impeller. However, since a certain angle of flow direction appears before the liquid is shunted, a liquid vortex as shown in fig. 2 is easily generated, which causes hydraulic loss, deteriorates the cavitation performance of the fire pump, causes a reduction in the lift and efficiency of the fire pump, and finally causes a failure of the fire fighting equipment, thereby bringing about a huge disaster to lives and properties of people.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the water suction chamber structure of the double-suction fire pump, which can improve the cavitation performance of the water suction chamber, improve the efficiency and the lift of the water pump, reduce the weight and the cost and reduce the casting difficulty.

The technical scheme adopted by the utility model is as follows: a double-suction fire pump water suction chamber structure comprises two axially symmetrically arranged semi-spiral water suction chambers, wherein each water suction chamber is provided with an inlet and two outlets; the water suction chamber is internally provided with a flow dividing structure with a streamline section, and the flow dividing structure is arranged on the intersection section of the water suction chamber and the water pressing chamber.

Furthermore, the cross section of the flow dividing structure is an isosceles triangle, two waists of the isosceles triangle are arc lines or straight lines, the two waists of the isosceles triangle are tangent to the outer wall of the pumping chamber, the vertex angle of the isosceles triangle is 30-60 degrees, and the vertex angle of the isosceles triangle is a circular angle.

Furthermore, the radius of fillet is 3 ~ 10 mm.

Furthermore, the shunting structure is a hollow structure, and the wall thickness of the shunting structure is consistent with that of the water suction chamber.

Compared with the prior art, the utility model has the beneficial effects that: the utility model has simple structure and low casting difficulty, and greatly reduces the cost and the weight of the pump; the utility model arranges the flow dividing structure in the water suction chamber, greatly improves the cavitation performance of the water suction chamber, improves the efficiency of the water pump, meets the use requirement and has higher application value.

Drawings

Fig. 1 is a schematic structural view of a suction chamber of a conventional double suction fire pump.

FIG. 2 is a schematic structural view of a water suction chamber of a conventional double-suction fire pump, which is expanded along a flow passage centerline M-M, and FIG. 2a is a schematic structural view of the water suction chamber, which is expanded along the flow passage centerline M-M, when the cross-sectional structure of the water suction chamber and a pumping chamber is rectangular; FIG. 2b is a schematic structural view showing that the water suction chamber is developed along the center line M-M of the flow passage when the cross section of the water suction chamber and the water pressing chamber is trapezoidal; FIG. 2c is a schematic structural view showing the water suction chamber expanded along the center line M-M of the flow passage when the cross-sectional structure of the water suction chamber and the water pumping chamber is circular.

Fig. 3 is a schematic structural diagram of the present invention.

FIG. 4 is a schematic view showing the streamline suction chamber of the present invention expanded along the center line M-M of the flow passage, and FIG. 4a is a schematic view showing the structure of the streamline suction chamber expanded along the center line M-M of the flow passage when the cross-sectional structure of the suction chamber and the pumping chamber is rectangular; FIG. 4b is a schematic structural view showing that the water suction chamber is developed along the center line M-M of the flow passage when the cross section of the water suction chamber and the water pressing chamber is trapezoidal; FIG. 4c is a schematic view showing the water suction chamber expanded along the center line M-M of the flow path when the cross-sectional structure of the water suction chamber and the water pumping chamber is circular.

FIG. 5 is a graph showing cavitation performance of a comparative test between a suction chamber of a conventional double suction fire pump and a suction chamber of the present invention.

Detailed Description

The technical scheme of the utility model is further specifically explained by the following drawings.

As shown in fig. 3 and 4, the present invention includes two axially symmetrically arranged semi-spiral water suction chambers 1, a water pumping chamber 2 and a streamline flow dividing structure 4. The water suction chamber 1 is provided with an inlet and two outlets; a flow dividing structure 4 with a streamline section is arranged in the water suction chamber 1, and the flow dividing structure 4 is arranged on the cross section of the water suction chamber 1 and the water pressing chamber 2.

The cross section of the water suction chamber and the water pumping chamber of the traditional double-suction fire pump is shown in fig. 2, and the cross section has three structural forms of a rectangular section structure 3.1a in fig. 2a, a trapezoid section structure 3.1b in fig. 2b and a circular section structure 3.1c in fig. 2 c. The utility model designs a streamline shunting structure 4 on the cross section of a water suction chamber 1 and a water pressing chamber 2 of the traditional double-suction fire pump.

As shown in fig. 4, the cross section of the flow dividing structure 4 of the present invention is an isosceles triangle, two sides 4.2 of the isosceles triangle are straight lines (or arc lines), and the two sides 4.2 of the isosceles triangle are tangent to the outer wall of the pumping chamber 2, an included angle θ = (30 ° -60 °) is formed between the two sides, a fillet is formed at an apex angle 4.1 of the isosceles triangle, and the radius R of the fillet is = 3-10 mm. The flow dividing structure 4 is a hollow structure 4.3, and the wall thickness A of the flow dividing structure 4 is consistent with that of the water suction chamber.

The utility model is mainly obtained by casting means, the process method is simple and reliable, the cavitation erosion performance of the water suction chamber can be improved, the efficiency of the water pump is improved, the advantages of weight reduction, cost reduction and low casting difficulty are achieved, the use requirement is met, and the application value is high.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. In the above embodiments, the present invention may be variously modified and changed. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a double suction fire pump suction chamber structure, characterized by: the device comprises two semi-spiral water suction chambers which are axially and symmetrically arranged, wherein each water suction chamber is provided with an inlet and two outlets; the water suction chamber is internally provided with a flow dividing structure with a streamline section, and the flow dividing structure is arranged on the intersection section of the water suction chamber and the water pressing chamber.

2. The suction chamber structure of a double suction fire pump as claimed in claim 1, wherein: the cross section of the flow distribution structure is an isosceles triangle, two waists of the isosceles triangle are arc lines or straight lines, the two waists of the isosceles triangle are tangent to the outer wall of the pumping chamber, the vertex angle of the isosceles triangle is 30-60 degrees, and the vertex angle of the isosceles triangle is a circular angle.

3. The suction chamber structure of a double suction fire pump as claimed in claim 2, wherein: the radius of fillet is 3 ~ 10 mm.

4. The suction chamber structure of a double suction fire pump as claimed in claim 2, wherein: the shunting structure is a hollow structure, and the wall thickness of the shunting structure is consistent with that of the water suction chamber.