CN209761755U - Water hammer eliminating system - Google Patents
Water hammer eliminating system Download PDFInfo
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- CN209761755U CN209761755U CN201920239765.9U CN201920239765U CN209761755U CN 209761755 U CN209761755 U CN 209761755U CN 201920239765 U CN201920239765 U CN 201920239765U CN 209761755 U CN209761755 U CN 209761755U
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- feed pump
- water supply
- water hammer
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Abstract
The utility model discloses a water hammer elimination system, including 8 feed pump import butterfly valves, 8 feed pumps, 8 feed pump export check valves, 8 feed pump export pressure measurement instrument, 8 feed pump export butterfly valve, 1 feed pump export female pipe pressure measurement appearance and 1 frequency conversion step-down start control system, frequency conversion step-down start control system connects 8 feed pump import butterfly valves, 8 feed pumps, 8 feed pump export check valves, 8 feed pump export pressure measurement appearance, 8 feed pump export butterfly valve and feed pump export female pipe pressure measurement appearance respectively. The utility model discloses the system can be when the output pressure of working shaft and the pressure of carrying the female pipe reach equilibrium, and before the start-up return circuit switches to the operation return circuit, open working shaft output butterfly valve, guarantee that the branch pipe gas can effectively discharge, eliminate the production of water hammer.
Description
Technical Field
The utility model relates to a water supply technical field specifically is a water hammer elimination system.
Background
The safety of a water supply system in the production process of a factory is an important link for ensuring the continuous and efficient production of the factory. The water hammer problem is a problem often encountered in a plant water supply system, and an inducing cause may exist in each process of design, installation, and use. It is necessary to seek an effective evading method of the water hammer problem, arrange a set of complete solution method from theory and practical application, and ensure the safety and high efficiency of the water supply system.
The generation of the water hammer comes from three aspects, (1) the program design, and the frequency converter switching time and the acceleration time are not properly set. Before the frequency converter does not drag the water supply pump, the program logic commands the equipment to switch the starting loop to the running loop before the water supply pump reaches the power frequency speed. (2) The water supply pump does not vent the pump body before it is put into operation. (3) And opening the outlet butterfly valve of the water supply pump before the outlet pressure of the water supply pump is smaller than the pressure of the water supply main pipe. In all three cases, if only one exists, the residual gas in the pump body or the pipeline can be caused, and thus the water hammer is generated. When the starting loop is switched to the running loop, the water flow of the main pipe backflushs the starting pipeline, so that the one-way valve makes a hammer-like sound, the power system trips, and the starting fails.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a water hammer elimination system to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
The utility model provides a water hammer elimination system, includes 8 working pump import butterfly valves, 8 working pumps, 8 working pump export check valves, 8 water supply pump export pressure detecting instrument, 8 water supply pump export butterfly valves, 1 working pump export female pipe pressure detecting instrument and 1 frequency conversion step-down start control system, frequency conversion step-down start control system connects 8 working pump import butterfly valves, 8 working pumps, 8 working pump export check valves, 8 water supply pump export pressure detecting instrument, 8 working pump export butterfly valves and working pump export female pipe pressure detecting instrument respectively.
As a further technical solution of the present invention: the power of the water supply pump is 160 KW.
As a further technical solution of the present invention: the variable-frequency voltage-reduction starting control system comprises a PLC and a frequency converter.
as a further technical solution of the present invention: the PLC adopts an S5-90U series PLC.
As a further technical solution of the present invention: and the PLC is communicated with the frequency converter through an MODBUS TCP network.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses the system can be when the output pressure of working shaft and the pressure of carrying the female pipe reach equilibrium, and before the start-up return circuit switches to the operation return circuit, open working shaft output butterfly valve, guarantee that the branch pipe gas can effectively discharge, eliminate the production of water hammer.
Drawings
Fig. 1 is a single line diagram of the main circuit of the present invention;
Fig. 2 is a control schematic diagram of the present invention.
Fig. 3 is an overall block diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1: referring to fig. 1-3, a water hammer eliminating system comprises 8 water supply pump inlet butterfly valves, 8 160KW water supply pumps, 8 water supply pump outlet one-way valves, 8 water supply pump outlet pressure detecting instruments, 8 water supply pump outlet butterfly valves, 1 water supply pump outlet main pipe pressure detecting instrument, and 1 set of variable frequency voltage reduction start control system. 8 sets of water supply pump valves work alone, and the female pipe of outlet connection water supply selects the pump valve group of corresponding cover number to put into operation according to the production needs.
The equipment control scheme comprises the following steps: the power of the water supply pump is 160KW, so that the starting current is large, and the impact on an electric power system is also large. In order to ensure the safety of a power system, the principle of voltage reduction starting and the working characteristics of a frequency converter are comprehensively used during control design, a main control loop is started by a frequency conversion loop and is switched to a power frequency loop to operate after an operating water pump reaches a certain rotating speed. The main loop single line diagram is shown in figure 1.
The system adopts a PLC controller to comprehensively manage the starting, switching and stopping of 8 sets of equipment. The method mainly relates to the following contents that (1) the frequency converter and the PLC are communicated through an MODBUS TCP network to realize the control of the PLC on the frequency converter and the acquisition of the running state of the frequency converter, and the running current, the ready state, the fault state and the running state of the frequency converter are required to be used in a control program; and after the frequency converter is free from faults and ready and stops for 60s, the frequency converter is considered to have a starting condition in the control logic. (2) When the control principle is designed, when the output contactor and the starting contactor of the frequency converter are electrified and attracted, the operating contactor cannot be electrified and attracted. (3) When the frequency converter, the frequency converter output contactor and the starting contactor are switched to the operation contactor, a proper switching time needs to be set, and arc short circuit and excessive attenuation of the motor operation speed are avoided. (4) And 8 sets of equipment are reasonably distributed and share a starting loop of the frequency converter. The PLC acquires the respective starting contactor state, operating contactor state and thermal protection state of 8 sets of equipment, combines the state of the frequency converter, outputs the state of the frequency converter and comprehensively dispatches the use of the starting frequency converter. The principle is that equipment is started inefficiently when a thermal protection fault equipment and a frequency converter starting loop do not have starting conditions. The control principle diagram is shown in figure 2.
Equipment processing and operation procedures: before the water supply equipment is put into operation, the sealing inspection of a pump body, a pipe fitting and a connecting piece is required; confirmation of the closed state of the outlet valve; confirming the direction of the check valve; and opening the inlet valve to exhaust the pump body. After all the operations are finished, the control system can be powered on for debugging the equipment. The operation procedures are as follows: (1) checking the working state of each related device to ensure the normal state; (2) starting on site, wherein the frequency converter is uniformly accelerated until the power frequency reaches 50 Hz; (3) and observing the pressure value of the outlet pressure gauge of the water supply pump, and opening the outlet valve of the water supply pump until the outlet pressure of the pump body is greater than or equal to the pressure value of the pressure gauge of the conveying main pipe.
Generation of water hammer: from three aspects, (1) programming, converter switching time point, acceleration time set up improper. Before the frequency converter does not drag the water supply pump, the program logic commands the equipment to switch the starting loop to the running loop before the water supply pump reaches the power frequency speed. (2) The water supply pump does not vent the pump body before it is put into operation. (3) And opening the outlet butterfly valve of the water supply pump before the outlet pressure of the water supply pump is smaller than the pressure of the water supply main pipe. In all three cases, if only one exists, the residual gas in the pump body or the pipeline can be caused, and thus the water hammer is generated. When the condition is shown, when the starting loop is switched to the running loop, the water flow of the main pipe backflushs the starting pipeline, so that the one-way valve makes a hammer-like sound, the power system trips, and the starting fails.
An effective evasion method of water hammer comprises the following steps: (1) when the program is designed, the switching time point and the acceleration time are reasonably designed, and when the starting loop reaches the power frequency speed, the switching from the starting loop to the running loop is carried out after the rotating speed of the motor reaches the power frequency rotating speed. (2) Before the equipment is put into use for the first time, exhausting is carried out strictly according to the operation regulations. (3) When equipment is started, the output pressure of the water supply pump is strictly monitored, and when the output pressure of the water supply pump and the pressure of the conveying main pipe reach balance, the output butterfly valve of the water supply pump is opened before the starting loop is switched to the operation loop, so that the gas in the branch pipe can be effectively discharged.
In conclusion, the safe and efficient operation of the factory water supply system depends on various links of design, installation and use. The water hammer problem is a problem frequently encountered by a water supply system, and can be effectively avoided through reasonable design, careful installation and correct use.
Embodiment 2, on the basis of embodiment 1, the PLC of this design adopts S5-90U series PLC, which is not only small in size, but also stable in performance, long in service life, low in power consumption, and suitable for industrial control.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a water hammer elimination system, includes 8 water supply pump import butterfly valves, 8 working pumps, 8 working pump export check valves, 8 water supply pump export pressure instrumentation, 8 water supply pump export butterfly valves, 1 working pump export female pipe pressure detection appearance and 1 frequency conversion step-down start control system, a serial communication port, frequency conversion step-down start control system connects 8 working pump import butterfly valves, 8 working pumps, 8 working pump export check valves, 8 water supply pump export pressure instrumentation, 8 working pump export butterfly valves and the working pump export female pipe pressure detection instrument respectively.
2. A water hammer mitigation system according to claim 1, wherein the water supply pump has a power of 160 KW.
3. The water hammer elimination system of claim 1 or 2, wherein the variable frequency buck start-up control system comprises a PLC and a frequency converter.
4. The water hammer elimination system of claim 3, wherein the PLC is an S5-90U series PLC.
5. the water hammer eliminating system according to claim 4, wherein the PLC and the frequency converter are communicated through a MODBUS TCP network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920239765.9U CN209761755U (en) | 2019-02-26 | 2019-02-26 | Water hammer eliminating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920239765.9U CN209761755U (en) | 2019-02-26 | 2019-02-26 | Water hammer eliminating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209761755U true CN209761755U (en) | 2019-12-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920239765.9U Active CN209761755U (en) | 2019-02-26 | 2019-02-26 | Water hammer eliminating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209761755U (en) |
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2019
- 2019-02-26 CN CN201920239765.9U patent/CN209761755U/en active Active
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