Device for pumping back sludge by using centrifugal pump

Abstract

The utility model discloses a device for pumping back sludge by using a centrifugal pump, which is characterized in that a liquid outlet is arranged at the lower part of a sludge sedimentation tank, a sludge return pipe is arranged on the liquid outlet, an electric stop valve, a filter I, an electric cut-off valve I, an electric one-way valve I and an electromagnetic flowmeter are sequentially arranged on the sludge return pipe, and a sludge return overline pipe is arranged on the sludge return pipe; the feeding end of the sludge backflow overline pipe is arranged between the electric stop valve I and the liquid outlet, the discharging end of the sludge backflow overline pipe is arranged between the electric one-way valve I and the electromagnetic flowmeter, and an electric stop valve II, a filter II and an electric one-way valve II are sequentially arranged on the sludge backflow overline pipe. And the electric cut-off valve I, the electric cut-off valve II and the electromagnetic flow meter are respectively connected with a DCS (Distributed Control System) through cables to form interlocking. According to the sludge reflux pump, continuous operation of the sludge reflux pump can be ensured, the hidden danger that a bearing of the sludge reflux pump is damaged due to foreign matters in sludge is eliminated, and shutdown overhaul of pump shaft damage and motor burning loss caused by shaft seal damage or bearing locking of the sludge reflux pump can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sludge back -pumping technical field, concretely relates to a device of back -pumping sludge using centrifugal pump. BACKGROUND

[0002] The centrifugal pump is worked by the centrifugal force of sludge produced by the rotation of impeller. Before starting, the pump shell and the sludge back -pumping pump inlet pipe must be filled with sludge, and then the motor is started, the pump shaft drives the impeller and sludge to rotate at high speed, and sludge is thrown to the outer edge of the impeller under the action of centrifugal force, and flows into the sludge back -pumping pump pressure sludge pipeline through the flow channel of the volute pump shell. The sludge in the sludge sedimentation tank is pressed into the pump shell under the action of atmospheric pressure due to the vacuum formed by the sludge thrown out under the action of centrifugal force at the center of the sludge back -pumping pump impeller. The impeller continuously flows into and out of the sludge under the action of the impeller, so that the purpose of conveying sludge is achieved. However, in the sewage treatment device, the sludge in the sludge sedimentation tank is mixed by domestic sewage and industrial sewage, which causes the existence of gloves, short joints, fine tubes, water bottles and other foreign matters in the sludge deposited in the sludge sedimentation tank. The existence of foreign matters in the sludge will block the sludge back -pumping pump inlet pipe, causing the pump body to run for a long time, which will cause the shaft seal of the sludge back -pumping pump to be damaged, and in severe cases, the pump shaft will be damaged and the motor will be burned.

[0003] To overcome the above-mentioned shortcomings, the existing technical solution is that the mechanical maintenance worker cleans the foreign matters in the sludge back -pumping pump inlet pipe after the sludge back -pumping pump is forced to stop due to the blockage of the sludge back -pumping pump inlet pipe. If the pump shaft is damaged and the motor is burned due to the seizure of the sludge back -pumping pump bearing, the bearing and the motor need to be purchased again, which not only prolongs the purchase cycle, but also causes the sludge in the sludge sedimentation tank to be unable to be treated due to the long maintenance time, which increases the production cost and is time-consuming and laborious. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a device of back -pumping sludge using centrifugal pump, to solve the problem that the sludge back -pumping pump of the sewage treatment device is blocked by foreign matters in the sludge when pumping the sludge in the sludge sedimentation tank, which causes the shaft seal of the sludge back -pumping pump to be damaged, and in severe cases, the pump shaft is damaged and the motor is burned.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] The utility model provides a device of sludge backflow using centrifugal pump, including sludge settling tank and sludge backflow pump, the lower part of sludge settling tank is provided with liquid outlet, and the liquid outlet is provided with sludge backflow pipe and sludge backflow pump intercommunication, and sludge backflow pipe is sequentially provided with electric cut -off valve, filter I, electric cut -off valve I, electric check valve I and electromagnetic flowmeter, and sludge backflow pipe is also provided with sludge backflow cross -over pipe, and the feed end of sludge backflow cross -over pipe is arranged between electric cut -off valve I and liquid outlet, and the discharge end of sludge backflow cross -over pipe is arranged between electric check valve I and electromagnetic flowmeter, and sludge backflow cross -over pipe is sequentially provided with electric cut -off valve II, filter II and electric check valve II, and electric cut -off valve I, electric cut -off valve II and electromagnetic flowmeter are connected through cable and DCS respectively and form interlock.

[0007] In order to further realize the utility model, the filter I and the filter II are both mesh stainless steel filters with a pore size of φ8mm.

[0008] In order to further realize the utility model, the inlet end of the sludge backflow pump is connected with the sludge backflow pipe, and the outlet end of the sludge backflow pump is provided with a sludge outlet pipe.

[0009] In order to further realize the utility model, the sludge backflow pump is a centrifugal pump.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] The electric cut-off valve I, the electric cut-off valve II and the electromagnetic flowmeter are connected through cable and DCS respectively and form interlock, when the electromagnetic flowmeter detects that the flow is too low, the DCS interlock immediately closes the electric cut-off valve, opens the electric cut-off valve II on the sludge backflow cross-over pipe, changes the sludge conveying from the sludge backflow pipe to the sludge backflow cross-over pipe, and quickly supplements the inlet medium flow, prevents the inlet end of the sludge backflow pump, i.e. the centrifugal pump, from being blocked due to foreign matter in the incoming sludge, causes the pump body to idle for a long time, causes the sludge backflow pump shaft seal to be damaged, seriously causes the sludge backflow pump bearing to be locked, causes the pump shaft to be damaged, and causes the motor to be burned, after the flow of the electromagnetic flowmeter returns to normal, i.e. after the sludge enters the sludge backflow cross-over pipe, immediately cleans the foreign matter in the sludge backflow pump inlet pipe through mechanical maintenance online, and ensures that the sludge in the sewage treatment process can be continuously pumped to the dosing device for sludge decomposition.

[0012] The utility model can ensure that the sludge backflow pump continuously operates, not only eliminates the hidden danger that the bearing of the sludge backflow pump is damaged due to foreign matter in the sludge, but also effectively avoids the stoppage for maintenance caused by the sludge backflow pump shaft seal being damaged or the bearing being locked, the pump shaft being damaged and the motor being burned.

[0013] This invention can filter out foreign objects in sludge using a φ8mm mesh stainless steel filter; and can measure the inlet flow of the sludge return pump using a high-precision electromagnetic flow meter to determine if there are any foreign objects blocking the inlet pipe of the sludge return pump; when the electromagnetic flow meter detects that the flow is too low, the DCS automatically switches the sludge transport from the sludge return pipe to the sludge return cross-line pipe, which facilitates online cleaning of foreign objects in the sludge return pump. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] The meanings of the reference numerals in the attached diagram are as follows: 1. Sludge return pump; 2. Sludge sedimentation tank; 3. Sludge return pipe; 4. Electric shut-off valve; 5. Filter I; 6. Electric shut-off valve I; 7. Electric check valve I; 8. Electromagnetic flow meter; 9. Sludge return cross-line pipe; 10. Electric shut-off valve II; 11. Filter II; 12. Electric check valve II; 13. Cable; 14. DCS; 15. Sludge outlet pipe; 16. Water inlet pipe. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 As shown, a device for pumping sludge back using a centrifugal pump includes a sludge settling tank and a sludge return pump 1. The sludge return pump 1 is a centrifugal pump. An outlet is provided at the lower part of the sludge settling tank 2, and a sludge return pipe 3 is installed on the outlet, connecting to the sludge return pump 1. The inlet end of the sludge return pump 1 is connected to the sludge return pipe 3, and a sludge outlet pipe 15 is provided at the outlet end of the sludge return pump 1. An electric shut-off valve 4, a filter I 5, an electric shut-off valve I 6, an electric check valve I 7, and an electromagnetic flow meter 8 are sequentially installed on the sludge return pipe 3. Sludge is also provided on the sludge return pipe 3. The sludge return pipe 9 has its inlet end located between the electric shut-off valve I6 and the outlet, and its outlet end located between the electric check valve I7 and the electromagnetic flow meter 8. The sludge return pipe 9 is sequentially equipped with an electric shut-off valve II10, a filter II11, and an electric check valve II12. Both filters I5 and II11 are mesh stainless steel filters with a pore size of φ8mm. The electric shut-off valve I6, the electric shut-off valve II10, and the electromagnetic flow meter 8 are connected to the DCS14 via cable 13 to form an interlock.

[0018] Filter I5 can filter out foreign objects in the inlet pipe 16 of sludge return pump 1, preventing foreign objects in sludge sedimentation tank 2 from entering electric shut-off valve I6 and jamming it, or preventing foreign objects in sludge sedimentation tank 2 from entering sludge return pump 1 and causing the bearing of sludge return pump 1 to seize, resulting in pump shaft damage and motor burnout.

[0019] Filter II11 can filter out foreign objects in the sludge return pump cross-pipe 9, preventing foreign objects in the sludge sedimentation tank 2 from entering the sludge return pump 1, causing the bearing of the sludge return pump 1 to seize, resulting in pump shaft damage and motor burnout.

[0020] The signal from the high-precision electromagnetic flowmeter 8 enters the DCS 14, and is interlocked with the electric shut-off valve I6 and electric shut-off valve II10 through the DCS 14. When the flow rate of the electromagnetic flowmeter 8 drops to the low interlock, the electric shut-off valve I6 immediately closes while the electric shut-off valve II10 opens to prevent the sludge return pump 1 from running dry.

[0021] The signals from electromagnetic flowmeter 8, electric shut-off valve I6, and electric shut-off valve II10 are connected to DCS17 to remind the central control operator that when sludge return pump 1 is switched to sludge return pump cross-line pipe 9, the operator should promptly contact the mechanical maintenance worker to handle any foreign objects in the inlet pipe 16 of sludge return pump 1.

[0022] The electric one-way valve I7 is designed to prevent the medium from flowing back to the inlet pipe 16 of the sludge return pump 1 when it is switched to the sludge return pump cross-line pipe 9, thus preventing the mechanical maintenance worker from performing maintenance.

[0023] The electric check valve II12 is designed to prevent the medium from flowing back into the sludge return pump cross-line pipe 9 when the sludge return pump 1 is drawing sludge from the inlet pipe 16 of the sludge return pump 1.

[0024] The installation of electric shut-off valve 4 and electric check valve I7 facilitates online cleaning of filter I5 by mechanical maintenance workers.

[0025] The installation of electric shut-off valve II10 and electric check valve II12 facilitates online cleaning of filter II11 by mechanical maintenance workers.

Claims

1. An apparatus for pumping sludge using a centrifugal pump comprising a sludge settling tank characterised in that: The sludge return pump (1) is further included, the lower part of the sludge sedimentation tank (2) is provided with a liquid outlet, the sludge return pipe (3) is arranged on the liquid outlet and communicates with the sludge return pump (1), the sludge return pipe (3) is sequentially provided with an electric cut-off valve (4), a filter I (5), an electric cut-off valve I (6), an electric check valve I (7) and an electromagnetic flowmeter (8), the sludge return pipe (3) is further provided with a sludge return cross-line pipe (9), the feeding end of the sludge return cross-line pipe (9) is arranged between the electric cut-off valve (4) and the liquid outlet, the discharging end of the sludge return cross-line pipe (9) is arranged between the electric check valve I (7) and the electromagnetic flowmeter (8), the sludge return cross-line pipe (9) is sequentially provided with an electric cut-off valve II (10), a filter II (11) and an electric check valve II (12), the electric cut-off valve I (6), the electric cut-off valve II (10) and the electromagnetic flowmeter (8) are respectively connected with the DCS (14) through cables (13) to form interlocking.

2. The apparatus for pumping sludge back using a centrifugal pump according to claim 1, characterized by: The filter I (5) and the filter II (11) are both mesh stainless steel filters with a pore size of φ8mm.

3. A device for pumping sludge back using a centrifugal pump according to claim 1 or 2, characterized in that: The inlet end of the sludge return pump (1) is connected with the sludge return pipe (3), and the outlet end of the sludge return pump (1) is provided with a sludge outlet pipe (15).

4. The apparatus for pumping sludge back using a centrifugal pump according to claim 3, characterized by: The sludge return pump (1) is a centrifugal pump.

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