CN212744286U

CN212744286U - Device for preventing damage of water hammer after accident of positive displacement diaphragm pump

Info

Publication number: CN212744286U
Application number: CN202022004916.8U
Authority: CN
Inventors: 韩军刚; 周传奇; 赵增佳; 李剑锋; 李申鹏; 田飞飞
Original assignee: Yunnan Dahongshan Pipeline Co Ltd
Current assignee: Yunnan Dahongshan Pipeline Co Ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-03-19
Anticipated expiration: 2030-09-14

Abstract

The utility model discloses a waterproof hammer damage device behind positive displacement diaphragm pump accident relates to ore pulp pipeline transport field. The device comprises a plurality of main pump diaphragm chambers, each diaphragm chamber is independently connected with a piston rod on a main pump, a main drain channel on the pushing liquid side of each diaphragm chamber is provided with a main maintenance valve, and the main drain channel is downwards communicated with an oil tank; the main drainage channel is provided with a pressure sensor, the pressure sensor is connected with a high-pressure electromagnetic valve on the main drainage channel, and the other end of the high-pressure electromagnetic valve is connected with a UPS connection port of the UPS control system. The advantage of this device lies in can effectually realizing in time releasing outlet pressure when losing power of main pump bent axle, ensures that main pump diaphragm chamber pressure is less than export check valve opening pressure, and the guarantee export check valve is in time closed, further prevents pressure conduction main pump bearing, realizes the protection of main pump.

Description

Device for preventing damage of water hammer after accident of positive displacement diaphragm pump

Technical Field

The utility model discloses a waterproof hammer damage device behind positive displacement diaphragm pump accident relates to ore pulp pipeline transport technical field.

Background

The positive displacement diaphragm pump has the advantages of high conveying lift, no direct contact between a conveying medium and a main power part of a pump body, high efficiency and the like, is widely applied to the field of solid-liquid two-phase flow (ore pulp) pipeline conveying, and is difficult to avoid the occurrence of a plurality of sudden accident shutdown conditions (such as power loss of a pump station, mechanical and control faults and the like) in the actual production operation process. As is known, in the process of fluid pipeline transportation, sudden shutdown can generate pump-stopping water hammers (related to transport media, pipeline characteristics, device performance and the like) of different degrees, and the pump-stopping water hammers have great harm to the whole system and are most obvious (such as water) in low-viscosity fluid, so that a water pipeline system can be designed with a plurality of water hammer prevention devices (such as check, pressure regulation, discharge, buffering and the like); in the ore pulp pipeline conveying system, the slurry has high viscosity (about 10 times of water); the transport flow rate is low (typically less than 2 m/s); the pipeline has high operating pressure, strong pulp abrasiveness and the like, so the pipeline is generally required to be full-open (namely, the flowing of pulp in the pipeline is not influenced by facilities such as valves on the pipeline in a full-open state), obviously, a water hammer prevention means in a water conveying system is not suitable for the pulp pipeline system, and a plurality of engineering practices prove that the problem is solved.

The water hammer effect (pressure oscillation trend) that the ore pulp pipe-line system produced when the pump was stopped in the accident is very big to positive discharge capacity diaphragm pump motion and transmission part (especially power end bent axle and bearing, speed reducer gear etc.) destruction, causes the mechanical fault in parts such as bearing, gear and connection to take place occasionally in time, has increaseed the cost of maintenance of main pump, influences the production organization. According to the production practice, the phenomenon is carefully analyzed and the utility model is provided.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model discloses a waterproof hammer damage device behind positive discharge capacity diaphragm pump accident, it effectively avoids the main pump bent axle to stop the destruction that brings because of the suddenness that external factor or self trouble lead to in the production operation process, especially to the piston chamber that the main pump piston rod in time releases pressure when losing power, the export check valve that makes the correspondence in time closes, the pressure unbalance that the counterattack that ensures pipeline water hammer production brought, and then conduct on the main pump bent axle, cause bigger injury.

The utility model adopts the technical scheme as follows:

the utility model discloses a device for preventing damage of a water hammer after an accident of a positive displacement diaphragm pump, which comprises a plurality of diaphragm chambers, wherein each diaphragm chamber is independently connected with a piston rod on a main pump, a main overhaul valve is arranged on a main drainage channel at the pushing liquid side of the diaphragm chambers, the main overhaul valve is opened for a long time, the main overhaul valve is closed for overhaul during overhaul, and a pipeline of the main drainage channel is downwards led to an oil tank;

furthermore, a pressure sensor is arranged on the main drainage channel and connected with a high-pressure electromagnetic valve on the branch drainage channel, a manual drainage valve is arranged on the other branch channel, the lower end of the manual drainage valve is connected with an oil inlet pipeline of the diaphragm chamber, and when the diaphragm pump is replaced by hydraulic oil, is stopped for a long time and then started or air enters an oil path system in the operation process, the air in the hydraulic oil needs to be discharged through the manual intermittent repeated opening and closing of the valve for a short time, so that the normal operation of a propulsion liquid system of the diaphragm pump is ensured;

furthermore, the high-pressure electromagnetic valve is of a normally closed type, and the lower end of the high-pressure electromagnetic valve is connected with an oil outlet pipeline of the diaphragm chamber; the other end of the high-voltage electromagnetic valve is connected with a UPS connection port of the UPS control system, and the high-voltage electromagnetic valve can be normally used under the condition of failure by supplying power to the high-voltage electromagnetic valve through the UPS;

furthermore, the UPS control system is connected with a main pump main power supply loss signal, a main pump emergency stop signal and a diaphragm chamber propelling liquid pressure signal;

further, after receiving any 1 or 2 of the above 2 accident signals, the control system with the UPS immediately compares the actual values of the monitoring pressure sensors once, outputs a result that the high-pressure electromagnetic valve corresponding to the maximum value is opened, and monitors that the difference between the maximum value and the second value is within the range

And then, outputting and closing the corresponding high-pressure electromagnetic valve to complete the monitoring and logic output.

The technical effects of the utility model are as follows:

the device can be applied to water hammer prevention in a water delivery system, and can be applied to an ore pulp pipeline conveying system, so that damage caused by sudden shutdown of a main pump crankshaft due to external factors or self faults in the production and operation processes is effectively avoided; by adopting the device, the pressure of the outlet can be timely released when the main pump crankshaft loses power effectively, the pressure of a diaphragm chamber of the main pump is lower than the opening pressure of the outlet check valve, the outlet check valve is guaranteed to be closed timely, the pressure is further prevented from being transmitted to a bearing of the main pump, and the protection of the main pump is realized.

Drawings

The figure is a schematic overall view of a diaphragm chamber;

A1-A3-diaphragm chamber main drain valve, B1-B3-manual drain valve, C1-C3-high pressure electromagnetic valve, P1-P3-pressure sensor, D-with UPS control system;

figure two is a diaphragm chamber device connection diagram;

1-inlet one-way valve, 2-outlet one-way valve, 3-diaphragm chamber, 4-manual drain valve, 5-high pressure solenoid valve, 6-manual drain valve, 7-with UPS control system, 8-diaphragm chamber oil inlet pipeline, 9-diaphragm chamber oil outlet pipeline and 10-pressure sensor.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

In this embodiment, the adopted data is a preferred scheme, but is not used to limit the present invention;

example 1

As shown in fig. 1-2, the main pump of this embodiment selects 3 diaphragm chambers, and releases the piston chambers with the highest pressure in time when 3 piston rods of the main pump lose power, so that the corresponding outlet check valves are closed in time, thereby ensuring pressure imbalance caused by counterattack generated by pipeline water hammer;

in the embodiment, a manual drain valve is arranged on the liquid pushing side of the diaphragm chamber, and a tee joint is arranged on the manual drain valve to form a main drain channel and two branch drain channels of the diaphragm chamber;

in this embodiment, a diaphragm chamber manual main drain valve and a pressure sensor are installed on the diaphragm chamber main drain channel, one end of the main drain valve is connected with a manual drain valve on the branch drain channel through the pressure sensor, and the other end of the main drain valve is connected with a high-pressure electromagnetic valve on the branch drain channel;

in the embodiment, one end of the manual drain valve on the branch drain channel is connected with the UPS control system, and the other end of the manual drain valve is connected with the oil inlet pipeline of the diaphragm chamber; one end of the high-pressure electromagnetic valve on the other branch drainage channel is connected with the UPS control system, and the other end of the high-pressure electromagnetic valve is connected with the oil outlet pipeline of the diaphragm chamber;

in this embodiment, the pressure sensor is provided with two ports, one port is connected with the pressure sensing interface of the UPS control system, and the other port is connected to the UPS connection port of the high-voltage solenoid valve connected with the UPS control system;

in this embodiment, one end of the diaphragm chamber is connected to the inlet check valve, and the other end of the diaphragm chamber is connected to the outlet check valve to the oil tank.

Example 2

As shown in fig. 1-2, in the diaphragm pump of the present embodiment, a1, a2, A3 are normally open during normal operation; b1, B2 and B3 are in an off state; c1, C2 and C3 are in power-off closed state; p1, P2 and P3 detect the pressure of three diaphragm chambers in real time; d is a control system with UPS, the port is connected with a pressure sensor to control the device in real time;

in the embodiment, A1, A2 and A3 are three diaphragm chamber main drain valves, a manual needle valve is selected as a main overhaul valve and is always in a normally open state; when a rear-end valve (B or C series valve) or a pipeline has a fault and needs to be repaired and replaced, the valve is closed, and an oil way can be temporarily cut off; after the maintenance is finished, the valve is manually opened, a worker observes the unobstructed condition of an oil way and a pressure value monitored by a system, manually controls the opening and closing degree of the valve, tests the maintenance effect and simultaneously ensures the personal safety of the operator;

in the embodiment, B1, B2 and B3 are manual drain valves on branch drain channels of three diaphragm chambers respectively, and the manual needle valves are adopted and are always in a normally closed state; when the diaphragm pump is replaced with hydraulic oil, the diaphragm pump is stopped for a long time and then started or air enters an oil way system in the operation process, the air in the hydraulic oil needs to be discharged through the valve in a manual intermittent manner and repeatedly opened and closed for a short time, and the normal operation of a propulsion liquid system of the diaphragm pump is ensured;

in this embodiment, C1, C2 and C3 are high-pressure solenoid valves on the other branch of the diaphragm chamber, and the valves and the B-series valves are in parallel connection on the passage and have two working states of full opening and full closing.

The above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a waterproof hammer damage device after positive displacement diaphragm pump accident, includes a plurality of diaphragm chambers (3), its characterized in that, every diaphragm chamber (3) is connected alone with the piston rod on the main pump, and the main drain channel pipeline leads to the oil tank downwards.

2. The device for preventing the damage of the water hammer after the accident of the positive displacement diaphragm pump according to claim 1, wherein a pressure sensor (10) is arranged on the main discharge passage, the pressure sensor (10) is connected with a high-pressure electromagnetic valve (5) on the main discharge passage, and the other end of the high-pressure electromagnetic valve (5) is connected with a UPS connection port of a UPS control system (7).

3. The device for preventing the damage of the water hammer after the accident of the positive displacement diaphragm pump according to claim 2, characterized in that the system with the UPS (7) monitors the pressure value of the diaphragm chamber (3) through the pressure sensor (10) on each drainage channel, and the system with the UPS (7) receives a main power supply loss signal, judges the fault type and feeds back the system; meanwhile, the monitoring values are compared, and a discharge passage of the high-pressure electromagnetic valve (5) is controlled to balance the pressure.

4. The device for preventing the water hammer damage after the accident of the positive displacement diaphragm pump according to claim 1, is characterized in that a main maintenance valve (4) is arranged on a main drainage channel on the pushing liquid side of the diaphragm chamber (3), wherein the main maintenance valve (4) is a manual valve and is connected with a pressure sensor (10), a high-pressure electromagnetic valve (5) and a diaphragm chamber oil outlet pipeline (9) in sequence downwards to lead to an oil tank.

5. A device for preventing water hammer damage after a positive displacement diaphragm pump accident according to claim 2, wherein the total drain passage forms a drain passage in parallel with the passage where the high pressure solenoid valve (5) is located, the parallel drain passage is provided with a normally closed manual drain valve (6), the upper end of the manual drain valve (6) leads to the diaphragm chamber (3), and the lower end is connected with a diaphragm chamber oil inlet pipe (8) and leads to the oil tank.

6. A device according to claim 2, wherein the pressure sensor (10) is provided with two ports, one port being connected to the pressure sensing interface of the UPS control system (7) and the other port leading to the UPS connection port of the high pressure solenoid valve (5) being connected to the UPS control system (7).

7. A device for preventing water hammer damage after an accident of a positive displacement diaphragm pump according to claim 1, characterized in that the diaphragm chamber is connected with the inlet check valve (1) at one end and the outlet check valve (2) to the oil tank at the other end.