CN218563906U - Fire pump with adjustable entry angle - Google Patents
Fire pump with adjustable entry angle Download PDFInfo
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- CN218563906U CN218563906U CN202222780648.8U CN202222780648U CN218563906U CN 218563906 U CN218563906 U CN 218563906U CN 202222780648 U CN202222780648 U CN 202222780648U CN 218563906 U CN218563906 U CN 218563906U
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Abstract
The utility model provides a fire pump with adjustable entry angle, includes water inlet, delivery port, spiral case and impeller assembly, the impeller assembly is including running through a plurality of blades, the impeller that the pivot that the bearing was installed on the spiral case rotated together with the pivot, be equipped with a plurality of protruding circular clitellums on the inner circle face of delivery port department, the blade equipartition is on circular impeller, the blade is convex, blade one end is the entrance point, the other end is the exit end, the blade definition that is located the delivery port end is the entrance point blade, the blade definition that is located the delivery port end is exit end blade, be equipped with the slotted hole at the impeller entrance point, the blade of entrance point is fixed in the slotted hole by the bolt, entry angle be that the entry end of blade intersects with the impeller, make the tangent line of blade earlier from the nodical department, make the tangent line of impeller again from the nodical department, the contained angle between two tangent lines.
Description
Technical Field
The invention relates to a fire pump, in particular to a fire pump with an adjustable inlet angle, and belongs to the technical field of machinery.
Background
At present, the domestic water pump is composed of a shell, a water inlet, an impeller and a water outlet, an output shaft of a motor is connected with a wheel shaft penetrating through the impeller through a coupler, water enters the pump body from the water inlet through a blade at the water inlet end, eddy current is generated at the water inlet because the water flow direction of the water inlet is the same as the impeller steering direction, the operation performance of the water pump is changed due to the eddy current phenomenon, firstly, the speed and the movement direction of the water flow at the inlet are changed, secondly, the pressure at the water inlet is increased, the flow of the water flow entering the blade is reduced, power overload is caused, the water pump vibrates violently, the noise is overlarge, the temperature of the shell is increased, the lift is reduced, the angle of the blade arranged on the impeller of the existing fire pump is fixed, and under the condition that no eddy current exists, the inlet angle of water flow flowing into the blades is determined, the flow and the lift of the water pump are also determined, the efficiency of the water pump is also determined, particularly the efficiency loss of the water pump is fixed at the inlet angle and unreasonable in design, the efficiency is low, particularly under the condition that the fire pump has eddy phenomena at different degrees, the fire pump is in a special and critical working mission, the optimal fire extinguishing time is missed, the huge loss is caused, in addition, the fire pump has to be in a full-load working state, once the fire pump fails in the working state, or the water supply amount is insufficient, the fire cannot be controlled, because the fire pump has to be in the full-load working state to supply water to the indoor fire hydrant pump, and once the fire occurs, the fire pump has to be in the full-load working state to exert the maximum efficiency, namely the set flow, the lift and the pressure are reached.
Disclosure of Invention
The invention solves the problem that a plurality of raised circular ring belts are arranged on the inner circular surface of the water inlet to solve the problem of water inlet vortex, the blades at the inlet end slide in the long slotted holes, so that the efficiency and the lift of the water pump are highest, the angle of the blades at the inlet end is changed, the radius of the circular blades is increased, the volume is increased, the flow is increased, the pressure at the outlet is increased, and the fire pump can exert the maximum effect.
The technical scheme adopted by the invention is as follows: a fire pump with an adjustable inlet angle comprises a water inlet, a water outlet, a volute and an impeller assembly, wherein the impeller assembly comprises a plurality of blades and an impeller, the blades and the impeller rotate together through a rotating shaft and a rotating shaft, the rotating shaft is installed on the volute in a penetrating mode through a bearing, a plurality of protruding circular ring belts are arranged on the inner circle surface of the water inlet, the blades are uniformly distributed on the circular impeller, one ends of the blades are arc-shaped, one ends of the blades are inlet ends, the other ends of the blades are outlet ends, the blades located at the water inlet end are defined as blades at inlet ends, the blades located at the water outlet end are defined as blades at outlet ends, the blades at the inlet ends are provided with circular through holes, bolts penetrate through the circular through holes, slotted holes are formed in the inlet ends of the blades at the inlet ends, the bolts and the impeller are connected into a whole, the inlet angle means that the inlet ends of the blades intersect with the impeller, the tangent lines of the blades are made from the intersection points, the tangent lines of the impeller, the included angles between the two tangent lines are acute angles, and the angles are variable angles.
Because the direction of the water inlet speed is changed by the vortex, the speed of the water flow of the water inlet can be decomposed into the circumferential vector direction along the water inlet and the vector direction along the directional blade at the water flow inlet end, the force of the circumferential vector direction of the water inlet is far larger than the force of the vector direction along the directional blade at the water flow inlet end by the vortex, so that the axial flow speed of the water flow at the blade inlet is reduced, the inlet rotation direction of the water pump is the same as the rotation direction of the impeller, the axial water flow speed is reduced, and the vortex is generated.
The blades at the inlet end are provided with a plurality of raised circular annular belts on the inner circular surface of the water inlet, so that the vector direction of water flow on the inner circular surface of the water inlet is changed, the axial water flow speed is increased, the radial water flow speed is reduced, the radial water flow speed or even the vector force is close to zero, the theoretical basis of vortex flow is solved, the radial direction refers to the direction of the vector force on the inner circular surface of the water inlet, the flow of the fire pump is increased, the lift is increased, the working efficiency of the pump reaches the theoretical design value, and the vibration noise of the pump is reduced.
The fire pump with the adjustable inlet angle has the advantages that the blades at the inlet end slide in the long slotted holes, the variation range of the inlet angle is 70-90 degrees, the inlet angle is gradually increased along with the increase of the angle of the water inlet, namely from 70 to 83 degrees, the working efficiency of the fire pump is improved from 71 percent to 82.8 percent through field test, the ratio of theoretical data to actual data is that when the angle of the water inlet is 70 degrees, the working efficiency of the fire pump is 69.2 percent, corresponding to the lift 66.21 m, when the angle of the water inlet is 73 degrees, the working efficiency of the fire pump is 71.52%, corresponding lift 67.84 m, when the angle of the water inlet is 75 degrees, the working efficiency of the fire pump is 73.39 percent, corresponding to the lift 67.96 m, when the angle of the water inlet is 78 degrees, the working efficiency of the fire pump is 79.68 percent, corresponding to the lift 66.99 m, when the angle of the water inlet is 80 degrees, the working efficiency of the fire pump is 82.8 percent, the corresponding lift is 68.25 meters, the working efficiency reaches the maximum, when the angle of the water inlet is 83 degrees, the working efficiency of the fire pump is 76.11 percent, the corresponding lift 61.51 m, the efficiency is reduced, the efficiency is improved by the combined effect of the reduction of the vortex and the change of the inlet angle, the efficiency of the fire pump is improved together, and current fire control water pump vortex problem does not solve, the vortex makes the flow that water in the unit interval got into the water pump show and reduces, the vortex has changed the direction of rivers, radial flow reduces promptly the axial flow direction and reduces, the flow that flows into the water pump blade reduces, the vortex has accelerated the pipe wall of rivers striking water pump, lead to the pipe wall temperature to rise, the noise increase, produce dynamic unbalance, the entrance angle is fixed, the cavity is fixed promptly, pressure, the flow is also fixed, the vortex leads to pressure, the flow reduces by a wide margin, bring fire control water pump efficiency along with it and reduce, the efficiency improvement of fire control water pump is the common superposition effect of a plurality of factors.
The blades are made of elastic materials, can bear certain working pressure, and are not deformed in the working state.
According to the fire pump with the adjustable inlet angle, the radius of the arc-shaped blades is changed when the blades at the inlet end slide in the long slotted holes, the arc radius is increased, namely the water inlet angle is increased, test data are measured through tests, when the inlet angle is 80 degrees, the vortex values of the guide vane plates on two sides at the inlet angle are minimum, the cavity entering the arc-shaped blades is maximum at the moment, the water entering the cavity is maximum, the vortex rotating forces of the inlet angle at the outlet end of the impeller and the outlet end bend are minimum, the water pressure at the outlet end is maximum, the lift is maximum, and the volume flow in unit time is maximum. Theoretically, the size and shape of the blade are fixed, the chamber is fixed, and the flow is also fixed.
The vortex is fire pump efficiency reduction key reason, and the vortex makes the rivers direction change, can not get into the blade, through experimental contrast, experimental one is: a fire pump does not set up a plurality of protruding circular clitellums on the interior disc of the blade of entrance point, and the entrance angle is also unadjustable, and experiment two is: the other fire pump is provided with a plurality of convex circular ring belts on the inner circular surface of the blade at the inlet end, the inlet angle is adjustable, a real-time detection water flow meter, a pressure gauge, a volute thermometer, a vibration noise meter and a lift meter are respectively arranged at the water inlet 1 and the water outlet 2, the data of the first test water pump and the second test water pump under the working state are respectively recorded,
the influence of the eddy current on the performance of the fire-fighting water pump is analyzed and compared, theoretical calculation data is compared with data actually measured by the first fire-fighting water pump and the second fire-fighting water pump to obtain data, the data measured by the second fire-fighting water pump is far larger than the data measured by the first fire-fighting water pump in performance in terms of water flow, pressure and lift, the data measured by the second fire-fighting water pump is far smaller than the data measured by the first fire-fighting water pump in performance, and the data of volute temperature and vibration noise are far smaller than the data measured by the first fire-fighting water pump in test.
The invention has the beneficial effects.
1. The inner circular surface of the water inlet is provided with a plurality of convex circular ring belts, the moving direction of water flow is changed, the axial water flow speed is increased, the radial water flow speed is reduced to be even zero, the eddy phenomenon is eliminated, the efficiency of the water pump is improved, the energy is saved, and the noise is reduced.
2. The blade of mouth end slides in the slotted hole and leads to the radius change of convex blade for the cavity that the blade encloses changes, and the contained angle is less, and the radius grow, the cavity that the blade and the spiral case of water pump enclose increase, and capacity increases thereupon, therefore pressure increase, the lift increase, efficiency improves.
Drawings
Fig. 1 is a front view schematically showing a fire pump with an adjustable inlet angle according to the present invention.
Fig. 2 is an angle diagram of an adjustable inlet angle of a fire pump with an adjustable inlet angle according to the present invention.
Wherein in the figure: 1. the device comprises a water inlet 2, a water outlet 3, a volute 4, a coupling 5, a motor 6, an impeller 7, blades 8, an annular belt 9 and an inlet angle.
Detailed Description
The invention will be further described with reference to the accompanying figures 1-2.
Example 1.
Firstly fixing the water pump on a fire pump test bed, connecting a motor 5 with a power supply, placing a water inlet 1 in a water pool, starting the motor to be in a working state, arranging a real-time detection water flow flowmeter, a pressure gauge, a volute thermometer, a vibration noise meter and a lift meter at the water inlet 1 and the water outlet 2, and recording the water flow value in unit time in m under the actual working state of the fire pump 3 The pressure value unit of the water inlet 1 is MPa, the pressure value unit of the water outlet 2 is MPa, the temperature value unit of the volute is, the vibration noise value unit is dB, and the lift value unit is meter.
A fire pump with an adjustable inlet angle comprises a water inlet 1, a water outlet 2, a volute 3 and an impeller assembly, wherein the impeller assembly comprises a plurality of blades 7 and an impeller 6, a rotating shaft penetrating through a bearing and mounted on the volute 3 rotates together with the rotating shaft, a plurality of raised circular ring belts 8 are arranged on the inner circular surface of the water inlet 1, the blades 7 are uniformly distributed on the circular impeller 6, the blades 7 are arc-shaped, one end of each blade 7 is an inlet end, the other end of each blade 7 is an outlet end, the blade 7 at the end of the water inlet 1 is defined as an inlet end blade, the blade 7 at the end of the water outlet 2 is defined as an outlet end blade, a slotted hole is formed in the inlet end of the impeller 6, the blades 7 at the end of the water inlet 1 are fixed in the slotted hole through bolts, the blades 7 at the inlet end slide in the slotted hole to cause the radius change of the arc-shaped blades 7, the inlet angle 9 means that the inlet end of the blade 7 intersects with the impeller 6, the tangent of the blade 7 is firstly made from the intersection point, the tangent of the impeller 6 is made from the intersection point, the included angle between the two tangents is formed, the blade 7 at the end of the water inlet 1 slides in the slotted hole, when the angle of the water inlet 1 is adjusted to be 70 degrees, the fire pump is arranged on a water pump test bed, the motor 5 is connected with a power supply, the water inlet 1 is arranged in a water pool, the motor is started to be in a working state, water enters the water pump from the water inlet 1 and is pressurized by the water pump impeller 6, the water flows out from the water outlet 2, a real-time detection flowmeter, a pressure gauge and a lift gauge are arranged at the water inlet 1 and the water outlet 2, the numerical value is recorded, the real-time detection flowmeter and the pressure gauge are obtained through calculation, the working efficiency of the fire pump is 69.2%, and the corresponding lift is 66.21 m.
Example 2.
A fire pump with an adjustable inlet angle comprises a water inlet 1, a water outlet 2, a volute 3 and an impeller assembly, wherein the impeller assembly comprises a plurality of blades 7 and an impeller 6, a rotating shaft penetrating through a bearing and mounted on the volute 3 rotates together with the rotating shaft, a plurality of raised circular ring belts 8 are arranged on the inner circular surface of the water inlet 1, the blades 7 are uniformly distributed on the circular impeller 6, the blades 7 are arc-shaped, one end of each blade 7 is an inlet end, the other end of each blade 7 is an outlet end, the blades 7 at the end of the water inlet 1 are defined as inlet end blades, the blades 7 at the end of the water outlet are defined as outlet end blades, a slotted hole is formed in the inlet end of the impeller 6, the blades 7 at the inlet end are fixed in the slotted hole through bolts, the blades 7 at the inlet end slide in the slotted hole to change the radius of the arc-shaped blades 7, the inlet angle 9 means that the inlet end of the blade 7 intersects with the impeller 6, a tangent line of the blade 7 is made from the intersection point, a tangent line of the impeller 6 is made from the intersection point, an included angle between the two tangent lines is formed, the blade 7 at the inlet end slides in the long slotted hole, when the angle of the water inlet is adjusted to 75 degrees, the fire pump is arranged on a water pump test bed, the motor 5 is connected with a power supply, the water inlet 1 is arranged in a water pool, the motor is started to be in a working state, water enters the water pump from the water inlet 1 and is pressurized by the water pump impeller 6, the water flows out from the water outlet 2, a real-time detection flowmeter, a pressure gauge and a lift gauge are arranged at the water inlet 1 and the water outlet 2, numerical values are recorded, and the real-time detection flowmeter, the pressure gauge and the lift gauge are calculated, at this time, the working efficiency of the fire pump is 73.39%, and the corresponding lift is 67.96 m.
Example 3.
A fire pump with an adjustable inlet angle comprises a water inlet 1, a water outlet 2, a volute 3 and an impeller assembly, wherein the impeller assembly comprises a plurality of blades 7 and an impeller 6, a rotating shaft penetrating through a bearing and mounted on the volute 3 rotates together with the rotating shaft, a plurality of raised circular ring belts 8 are arranged on the inner circular surface of the water inlet 1, the blades 7 are uniformly distributed on the circular impeller 6, the blades 7 are arc-shaped, one end of each blade 7 is an inlet end, the other end of each blade 7 is an outlet end, the blades 7 positioned at the water inlet end are defined as inlet end blades, the blades 7 positioned at the water outlet end are defined as outlet end blades, a slotted hole is formed in the inlet end of the impeller 6, the blades 7 at the inlet end are fixed in the slotted hole through bolts, the blades 7 at the inlet end slide in the slotted hole to cause the radius change of the arc-shaped blades 7, the inlet angle 9 means that the inlet end of the blade 7 intersects with the impeller 6, the tangent line of the blade 7 is made at the intersection point firstly, the tangent line of the impeller 6 is made at the intersection point again, the included angle between the two tangent lines is formed, the blade 7 at the inlet end slides in the long groove hole, when the angle of the water inlet is adjusted to be 80 degrees, the fire pump is fixed on the water pump test bed, the motor 5 is connected with the power supply, the water inlet 1 is arranged in the water pool, the motor is started to be in a working state, water enters the water pump from the water inlet 1 and is pressurized through the water pump impeller 6, and water flows out from the water outlet 2, a real-time detection flowmeter, a pressure gauge and a lift gauge are arranged at the water inlet 1 and the water outlet 2, numerical values are recorded, the real-time detection flowmeter and the pressure gauge are calculated, the working efficiency of the fire pump is 82.8%, and the corresponding lift is 68.25 meters.
Claims (3)
1. The utility model provides a fire pump with adjustable entry angle, includes water inlet (1), delivery port (2), spiral case (3) and impeller assembly, and impeller assembly is including running through a plurality of blades (7), impeller (6) that the pivot that the bearing installed on spiral case (3) rotated together with the pivot, its characterized in that: the impeller is characterized in that a plurality of raised circular ring belts (8) are arranged on the inner circular surface of the water inlet (1), blades (7) are uniformly distributed on a circular impeller (6), the blades (7) are arc-shaped, the blades (7) positioned at the water inlet (1) end are defined as blades (7) at the inlet end, the blades (7) positioned at the water outlet (2) end are defined as blades (7) at the outlet end, the impeller (6) at the water inlet (1) end of the impeller (6) is provided with a slotted hole, the blades (7) at the water inlet (1) end are fixed in the slotted hole through bolts, an inlet angle (9) refers to the intersection of the inlet end of the blades (7) and the impeller (6), the tangent of the blades (7) is made at the intersection point, the tangent of the impeller (6) is made at the intersection point, and the included angle between the two tangents is made at the intersection point.
2. A fire pump as defined in claim 1, having an adjustable inlet angle, wherein: the vanes (7) of the inlet end slide in the long slotted holes, and the variation range of the inlet angle (9) is 70-90 degrees.
3. A fire pump as defined in claim 2, having an adjustable inlet angle, wherein: the inlet end blades (7) slide in the long slotted holes to cause the radius of the circular arc-shaped blades (7) to change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222780648.8U CN218563906U (en) | 2022-10-21 | 2022-10-21 | Fire pump with adjustable entry angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222780648.8U CN218563906U (en) | 2022-10-21 | 2022-10-21 | Fire pump with adjustable entry angle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218563906U true CN218563906U (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222780648.8U Active CN218563906U (en) | 2022-10-21 | 2022-10-21 | Fire pump with adjustable entry angle |
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| Country | Link |
|---|---|
| CN (1) | CN218563906U (en) |
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2022
- 2022-10-21 CN CN202222780648.8U patent/CN218563906U/en active Active
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