CN111238607B - Durability test device and method for water meter - Google Patents
Durability test device and method for water meter Download PDFInfo
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- CN111238607B CN111238607B CN202010112499.0A CN202010112499A CN111238607B CN 111238607 B CN111238607 B CN 111238607B CN 202010112499 A CN202010112499 A CN 202010112499A CN 111238607 B CN111238607 B CN 111238607B
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- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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Abstract
The invention discloses a durability test device and method for a water meter, and relates to the technical field of durability tests. The device and the method adopt a constant torque frequency converter matched with a vector type motor to drive a vertical water pump, and the vertical water pump normally supplies water in a follow current part of a continuous flow test; the cutoff part of the intermittent flow test is characterized in that the constant-torque frequency converter instantaneously brakes the vertical water pump in a resistance braking mode to achieve the purpose of cutoff, a stop valve is not required to be installed on a pipeline, and the intermittent flow test is realized without starting and stopping a valve, so that the loss of valve accessories is avoided, the maintenance frequency of the device is reduced, and the test cost is reduced.
Description
Technical Field
The invention belongs to the technical field of durability tests, and particularly relates to a durability test device and method for a water meter.
Background
The durability test device of the existing water meter is 3-meter position, the device is composed of a circulating water tank, a vertical water pump, a pipeline, an electric control valve, an instantaneous flow meter, a PLC (programmable logic controller), a control circuit, a temperature and pressure measuring element, a touch display screen, a printer and the like, and has the test functions of continuous flow and discontinuous flow. The volume of the circulating water tank is 0.5m3A direct current motor control ball valve is used as an execution element of the discontinuous flow test, and a control system adopts a PLC + touch screen form, so that the parameters of the test process can be monitored conveniently. The device has a self-protection function, and can automatically cut off the water pump when test parameters deviate or a pipeline breaks down.
The device can carry out continuous flow test and discontinuous flow test. During the continuous flow test, after the table utensil presss from both sides the dress, set for flow and operating time at the user, the water pump is from circulating water tank with clean water pump pumping into pipeline, circulates according to following route: circulating water tank-water gauge-stop valve-flowmeter for indication-circulating water tank. During continuous test, the valve between the water meter and the flowmeter is fully opened, the test flow is the overload flow of the water meter, and the time duration is 100 hours. In the intermittent flow test, the flow is set by the same method, the valve between the water meter and the flow meter is opened and closed at intervals of 15s, 10 ten thousand tests are required, and the test flow is the common flow of the water meter.
However, the prior art devices have the following drawbacks:
1. no liquid level monitoring facility and automatic water changing system. The circulating water tank has limited empty volume, clean water circulates for a long time in the test process, the water temperature rises continuously, and when the room temperature is 25 ℃, the water temperature exceeds the test allowable temperature after the continuous flow test runs for 6 hours. At the moment, low-temperature tap water needs to be supplemented from the outside for replacement, so that the water body in the circulating water tank is cooled and the uninterrupted work is kept. Because the equipment does not have a liquid level monitoring facility and an automatic water changing system, the water temperature can only be checked manually at regular time, when the water temperature reaches a specific value, a water replenishing valve is manually opened, but water is wasted due to overlarge flow, and if the inflow water flow exceeds the overflow capacity of an overflow hole at the upper part of the circulating water tank, water overflow occurs, so that an accident is caused; and if the flow is too small, the water body cannot be effectively cooled, and the test progress and data are influenced.
2. The hardware loss is large. The stop valve between the water meter and the flowmeter is an electric control pneumatic ball valve. During the intermittent flow test, the valve needs to be opened and closed continuously for 10 ten thousand times, the service life of a common valve is about 3 ten thousand times, and the quality of the common valve can reach 5-6 ten thousand times. Therefore, a group of water meters is tested, at least 2 stop valves need to be replaced, hardware loss is large, and cost is high. On the other hand, during rivers cut off, the water pump does not stop work, and the water pump can suppress the pressure this moment, and in the test process, the water pump can intermittently suppress the pressure and reach 10 ten thousand times, so for a long time, the water pump performance can receive certain influence for the plant maintenance frequency increases, and the expense rises.
3. And can not be operated unattended. The running time of the durability test of the water meter is long, and the total of the intermittent flow quantity test and the continuous flow quantity test is about 1000 hours. The operation was continued for 24 hours a day, and it took 42 consecutive days to complete the whole experiment. However, the device has no monitoring functions of water temperature, liquid level and the like, cannot issue early warning information, and cannot be remotely controlled. On the premise that safety cannot be comprehensively and effectively guaranteed, the device can only be checked by testers at regular time, and normal operation of the device is guaranteed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a durability test device and method of a water meter, and aims to solve the problems of high hardware loss, high test cost and the like of the conventional device.
The invention solves the technical problems through the following technical scheme: a durability test device of a water meter comprises: circulating water tank, vertical water pump, flowmeter, PLC controller, touch display screen and press from both sides the table ware, characterized by still includes: the device comprises a constant-torque frequency converter, a vector motor, a first temperature sensor, a second temperature sensor, a pressure sensor and a liquid level sensor;
the circulating water tank is communicated with a water inlet of a vertical water pump through a first pipeline, a water outlet of the vertical water pump is communicated with a water inlet of the meter clamping device through a second pipeline, a water outlet of the meter clamping device is communicated with the circulating water tank through a third pipeline, and the water meter to be measured is clamped by the meter clamping device; a first temperature sensor and a pressure sensor are arranged on the second pipeline and close to the water inlet of the meter clamping device; a flowmeter is arranged on the third pipeline and close to the water outlet of the meter clamping device; a second temperature sensor and a liquid level sensor are arranged in the circulating water tank; the circulating water tank is also communicated with the normal-temperature water tank through a water inlet valve, and the bottom of the circulating water tank is communicated with a drain pipe through a drain valve;
the PLC is respectively connected with the touch display screen, the first temperature sensor, the second temperature sensor, the pressure sensor, the liquid level sensor, the flowmeter, the constant-torque frequency converter, the water inlet valve and the water discharge valve; the constant-torque frequency converter is connected with the vector type motor, and the vector type motor is connected with the vertical water pump.
According to the testing device, relevant parameters (including the upper limit and the lower limit of water temperature and the upper limit and the lower limit of pressure in the circulating water tank, the total operation time, the total on-off times, early warning information and the like of the device) are set on the touch display screen, and after the device is started, the vector type motor drives the vertical water pump to pump water into a pipeline from the circulating water tank, the water flows through a water meter to be tested, and returns to the circulating water tank after passing through the flow meter; the device adopts a constant-torque frequency converter matched with a vector motor to drive a vertical water pump, and the vertical water pump normally supplies water in a follow current part of a continuous flow test; the cutoff part of the intermittent flow test, the constant torque frequency converter adopts a resistance braking mode to instantaneously brake the vertical water pump to achieve the purpose of cutoff, a stop valve is not required to be installed on a pipeline, and the intermittent flow test realizes the start and stop of a valve, so that the device basically has no loss of valve accessories, the maintenance frequency of the device is reduced, and the test cost is reduced.
The device runs uninterruptedly according to the set relevant parameters, the water temperature in the circulating water tank is monitored by the second temperature sensor, when the water temperature reaches the upper limit value, a water inlet valve and a water discharge valve of the circulating water tank are opened, normal-temperature water enters the circulating water tank, meanwhile, high-temperature water in the circulating water tank is discharged, the water temperature is gradually reduced, and the test is continued; when the water temperature is reduced to a lower limit value, closing a water inlet valve and a water discharge valve of the circulating water tank; the device has realized the automatic water function of trading of circulation tank through the monitoring of water temperature and liquid level, has avoided the too big water waste of flow that manual control valve moisturizing leads to and has taken place to spill over the accident to and the unable effective water cooling of carrying on of flow undersize, influence test result.
Further, manual ball valves are arranged on the first pipeline, a second pipeline between the first temperature sensor and the meter clamping device, a third pipeline between the meter clamping device and the flow meter, and a third pipeline between the flow meter and the circulating water tank; the flow in the pipeline is adjusted to a preset value through the manual ball valve, and when the test is started at each time, the flow is adjusted once.
Furthermore, the PLC controller is respectively connected with the first temperature sensor, the second temperature sensor and the pressure sensor through the communication module and the analog quantity module.
Furthermore, the analog quantity module is FX3u-4AD-ADP, the analog quantity input adapter of the type can carry out voltage input (DC (0-10) V) or current input (DC (4-20) mA) of 4 channels, and data can be transmitted without a special instruction.
Furthermore, the model of the communication module is FX3u-485ADP-MB, the communication module of the model supports Modbus485 communication, and the program is simpler.
Further, the PLC controller is connected with the terminal through the wireless DTU module, realizes remote monitoring, prompting alarm, startup and shutdown and the like through the terminal, does not need personnel to check regularly, saves manpower and material resources, and improves efficiency.
Furthermore, the constant-torque frequency converter is in a model FR-A840-00126, has first-class driving performance, can reach an operating frequency of 400Hz when being subjected to real-time sensorless vector control, and has high torque starting capability.
The invention also provides a method for carrying out the durability test of the water meter by using any one durability test device of the water meter, which comprises the following steps:
step 1: setting test related parameters, wherein the parameters comprise an upper limit value and a lower limit value of water temperature in the circulating water tank, an upper limit value and a lower limit value of liquid level in the circulating water tank, an upper limit value and a lower limit value of water pressure in a pipeline, preset time of continuous flow, total test operation time and total test on-off times;
step 2: the water supply of the vertical water pump is controlled by controlling the operation of the constant-torque frequency converter and the vector type motor: during the continuous flow test, the vertical water pump normally supplies water until reaching the preset time of the continuous flow; during the interrupted flow test, the flow continuing part and the vertical water pump normally supply water; in the current breaking part, a constant-torque frequency converter instantaneously brakes the vertical water pump through a vector motor in a resistance braking mode to achieve the current breaking purpose;
and step 3: controlling the water temperature in the circulating water tank to be between the upper limit value and the lower limit value of the water temperature;
and 4, step 4: adjusting the opening of the manual ball valve to enable the flow displayed by the flow meter to reach a flow value required by the test;
and 5: recording the display values of the first temperature sensor and the pressure sensor once every a period of time, and recording the daily accumulated water quantity of each water meter to be measured;
step 6: and stopping the test after the total running time or the total on-off times of the test are reached.
Further, in step 3, the specific control process of the water temperature in the circulating water tank is as follows: when the water temperature reaches the upper limit value and needs to be cooled, a water inlet valve and a water discharge valve of the circulating water tank are opened, normal-temperature water enters the circulating water tank, high-temperature water in the circulating water tank is discharged, and the water temperature is gradually reduced; when the water temperature is reduced to the lower limit value, a water inlet valve and a water discharge valve of the circulating water tank are closed.
Further, when the water temperature reaches the upper limit value and needs to be cooled, if the liquid level rises to the upper limit value, the water inlet valve is closed, and the drain valve is normally opened; if the liquid level is reduced to the lower limit value, the drain valve is closed firstly, if the circulating water tank is in water inlet state at the moment, the water inlet valve is still kept open, and when the liquid level reaches the upper limit value, the water inlet valve is closed again; because the flow of inlet water and outlet water controlled by the water inlet valve and the water discharge valve is limited by working conditions and cannot be completely equal, the upper limit value and the lower limit value of the liquid level are combined to carry out safety control, and the problems that the water in the circulating water tank overflows and the water body cannot be effectively cooled due to too small flow are solved.
Advantageous effects
Compared with the prior art, the durability test device and method for the water meter provided by the invention have the advantages that the constant-torque frequency converter is matched with the vector type motor to drive the vertical water pump, the follow current part of the continuous flow test is used, and the vertical water pump supplies water normally; in the flow cutoff part of the intermittent flow test, the constant-torque frequency converter instantaneously brakes the vertical water pump in a resistance braking mode to achieve the purpose of flow cutoff, a stop valve is not required to be installed on a pipeline, and the intermittent flow test realizes no valve starting and stopping, so that no valve accessory is lost, the maintenance frequency of the device is reduced, and the test cost is reduced; the device passes through temperature sensor and level sensor in the circulating water tank, cooperates water intaking valve and outlet valve again, realizes the control of temperature in the circulating water tank, has avoided the too big water waste of flow that manual control valve moisturizing leads to and has taken place to spill over the accident to and the unable effective water cooling of carrying on of flow undersize, influence test result.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a water meter durability test device in an embodiment of the invention;
FIG. 2 is a block diagram showing the structure of an electric control section in the embodiment of the present invention;
FIG. 3 is a schematic view of the water flow direction in an embodiment of the present invention;
the system comprises a vertical water pump 1, a pressure sensor 2, a first temperature sensor 3, a meter clamping device 4, a measured water meter 5, a flow meter 6, a liquid level sensor 7, a water inlet valve 8, a water discharge valve 9, a first manual ball valve 10, a water flow direction 11, a second temperature sensor 12, a PLC controller 13, a constant torque frequency converter 14, a vector motor 15, a second manual ball valve 16, a third manual ball valve 17 and a fourth manual ball valve 18.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the durability test device for a water meter provided by the invention comprises: the device comprises a circulating water tank, a vertical water pump 1, a flowmeter 6, a PLC (programmable logic controller) 13, a touch display screen, a meter clamping device 4, a constant torque frequency converter 14, a vector type motor 15, a first temperature sensor 3, a second temperature sensor 12, a pressure sensor 2 and a liquid level sensor 7;
the circulating water tank is communicated with a water inlet of the vertical water pump 1 through a first pipeline, a water outlet of the vertical water pump 1 is communicated with a water inlet of the meter clamping device 4 through a second pipeline, a water outlet of the meter clamping device 4 is communicated with the circulating water tank through a third pipeline, and the water meter to be measured 5 is clamped by the meter clamping device 4; a first temperature sensor 3 and a pressure sensor 2 are arranged on the second pipeline and close to a water inlet of the meter clamping device 4; a flowmeter 6 is arranged on the third pipeline and close to the water outlet of the meter clamping device 4; a second temperature sensor 12 and a liquid level sensor 7 are arranged in the circulating water tank; the circulating water tank is also communicated with the normal-temperature water tank through a water inlet valve 8, and the bottom of the circulating water tank is communicated with a drain pipe through a drain valve 9;
the PLC 13 is respectively connected with the touch display screen, the first temperature sensor 3, the second temperature sensor 12, the pressure sensor 2, the liquid level sensor 7, the flowmeter 6, the constant torque frequency converter 14, the water inlet valve 8 and the water discharge valve 9; the constant torque frequency converter 14 is connected with the vector type motor 15, and the vector type motor 15 is connected with the vertical water pump 1. In this embodiment, the installation of the water meter on the meter clamping device is the prior art, and reference is made to patent document with application number CN201721695582.5 entitled water meter sewage environment abrasion resistance detection device.
In the test device in the embodiment, relevant parameters (including upper and lower limits of water temperature and pressure in the circulating water tank, total operation time, total on-off times, early warning information and the like) are set on the touch display screen, and after the device is started, the vector type motor 15 drives the vertical water pump 1 to pump water into a pipeline from the circulating water tank, the water flows through the measured water meter 5 and returns to the circulating water tank after passing through the flow meter 6, as shown in fig. 3; the device adopts a constant-torque frequency converter 14 matched with a vector type motor 15 to drive a vertical water pump 1, and the vertical water pump 1 normally supplies water in a follow current part of a continuous flow test; in the flow cutoff part of the intermittent flow test, the constant-torque frequency converter 14 instantaneously brakes the vertical water pump 1 in a resistance braking mode to achieve the purpose of flow cutoff, a stop valve is not required to be installed on a pipeline, and the intermittent flow test is realized without starting and stopping a valve, so that the device basically has no loss of valve accessories, the maintenance frequency of the device is reduced, and the test cost is reduced.
The device runs uninterruptedly according to the set relevant parameters, the water temperature in the circulating water tank is monitored by a second temperature sensor 12, when the water temperature reaches an upper limit value, a water inlet valve 8 and a water discharge valve 9 of the circulating water tank are opened, normal-temperature water enters the circulating water tank, meanwhile, high-temperature water in the circulating water tank is discharged, the water temperature is gradually reduced, and the test is continued; when the water temperature is reduced to the lower limit value, closing a water inlet valve 8 and a water discharge valve 9 of the circulating water tank; the device has realized the automatic water function of trading of circulation tank through the monitoring of water temperature and liquid level, has avoided the too big water waste of flow that manual control valve moisturizing leads to and has taken place to spill over the accident to and the unable effective water cooling of carrying on of flow undersize, influence test result. Because the flow of inlet water and outlet water is controlled by the water inlet valve 8 and the water discharge valve 9 and is limited by working conditions, the flow can not be completely equivalent, and therefore, the safety control needs to be carried out by combining the upper limit value and the lower limit value of the liquid level: when the water temperature reaches the upper limit value, if the liquid level rises to the upper limit value, the water inlet valve 8 is closed, and the drain valve 9 is normally opened; if the liquid level is reduced to the lower limit value, the drain valve 9 is closed, if the circulating water tank is in water inlet state, the water inlet valve 8 is still kept open, and when the liquid level reaches the upper limit value, the water inlet valve 8 is closed.
In this embodiment, a fourth manual ball valve 18 is arranged on the first pipeline, a first manual ball valve 10 is arranged on the second pipeline between the first temperature sensor 3 and the meter clamping device 4, a second manual ball valve 16 is arranged on the third pipeline between the meter clamping device 4 and the flow meter 6, and a third manual ball valve 17 is arranged on the third pipeline between the flow meter 6 and the circulating water tank; the manual ball valves are used for adjusting the flow in the pipeline to a preset value (namely the flow value required by the test), and the flow is adjusted once when the test is started.
In this embodiment, the electrical control portion of the testing apparatus includes a PLC controller, a touch display screen, an analog quantity module, a communication module, a constant torque frequency converter, a vector motor, a temperature sensor, a pressure sensor, a flowmeter, various valves, and the like. The PLC controller is communicated with the touch display screen through a programming port by adopting RS 422; the PLC is connected with the analog quantity module, the communication module and the like by adopting an internal control bus; the analog quantity module is connected with a first temperature sensor, a second temperature sensor and a pressure sensor which contain standard analog quantity signals (4-20) mA or (0-10) V output through wiring; the PLC controller controls the start-stop operation of the constant-torque frequency converter by adopting RS485 and collects fault information of the constant-torque frequency converter; the constant-torque frequency converter provides a variable-frequency power supply for the vector motor to drive the vertical water pump to supply water; the output signal of the PLC controller is used for controlling the opening and closing of the water inlet valve and the water discharge valve; the switching value signal output by the liquid level sensor is sent to the PLC controller; and an open collector pulse signal output by the flowmeter is sent to the PLC.
The analog quantity module is FX3u-4AD-ADP, the analog quantity input adapter can carry out voltage input (DC (0-10) V) or current input (DC (4-20) mA) of 4 channels, and data can be transmitted without a special instruction. The model of the communication module is FX3u-485ADP-MB, the communication module of the model supports Modbus485 communication, and the program is simpler. The model number of the PLC is FX3u-32AMT/ES-A, and the FX3u series PLC has high-speed processing capacity, can be matched with the analog quantity module and the communication module to expand functions required by the test, and provides flexibility and control capacity for the durability test of the water meter. The model of the touch display screen is GS2110, the display screen has the advantages of simple interface, strong function, simplicity and convenience in operation, a built-in USB interface and support of an SD data storage card. The constant-torque frequency converter is in the model FR-A840-00126, has first-class driving performance, can reach the operation frequency of 400Hz when being subjected to real-time sensorless vector control, and has high-torque starting capability. The vector type motor is YVF2-2P-3KW-B14, the Siemens YVF2 series motor can be used with a domestic and foreign frequency converter, the operation is reliable, the maintenance is convenient, and the axial flow fan is independently arranged, so that the vector type motor has better cooling effect under different rotating speeds.
Accomplish the durability test of a set of water gauge, the device needs about 1.5 months of incessant continuous operation in 24 hours, the PLC controller passes through wireless DTU module and terminal connection, realize the remote monitoring of temperature and liquid level through the terminal, remote prompt is reported to the police and the switch-on and shut-down etc. after setting up relevant parameter, whole testing process can be accomplished automatically, and regularly send relevant experimental data to terminal, supply the experimenter to refer to, and need not personnel timing inspection, the material resources of using manpower sparingly, the efficiency of promotion. In this embodiment, the terminal includes a mobile phone APP, a web browser, a wechat applet, and a mailbox.
In the embodiment, the technical indexes of the test device are that the part 2 of the drinking cold water meter and the hot water meter are combined with the national standard GB/T778.2-2018/ISO 4064-2: 2014: the requirements of the test method and the arrangement condition of the water meter durability test device.
1. Intermittent flow test
Measuring the caliber range: DN15mm, DN20mm, DN25mm
Measuring the flow range: (1 to 8) m3/h
Test water temperature range: test pressure range (20 ± 5) ° c: (0.1 to 1.0) MPa
Test flow accuracy: q3±5%
Test on or off duration: 1s
The test water supply or water cut-off time is as follows: 15s
2. Continuous flow rate test
Measuring the caliber range: DN15mm, DN20mm, DN25mm
Measuring the flow range: (1 to 8) m3/h
Test water temperature range: (20 +/-5) DEG C
Maximum allowable working pressure of the device: 1.0MPa
Test flow accuracy: q4±5%
Instantaneous flow stability: is better than 2 percent
The invention also provides a method for performing the durability test of the water meter by using any one durability test device of the water meter in the embodiment, which comprises the following steps:
step 1: setting test related parameters, wherein the parameters comprise an upper limit value and a lower limit value of water temperature in the circulating water tank, an upper limit value and a lower limit value of liquid level in the circulating water tank, an upper limit value and a lower limit value of water pressure in a pipeline, preset time of continuous flow, total test operation time and total test on-off times;
step 2: controlling the constant torque frequency converter and the vector type motor to operate to control the vertical water pump to supply water: during the continuous flow test, the vertical water pump normally supplies water until reaching the preset time of the continuous flow; during the discontinuous flow test, the continuous flow part and the vertical water pump normally supply water as during the continuous flow test; in the current breaking part, a constant-torque frequency converter instantaneously brakes the vertical water pump through a vector motor in a resistance braking mode to achieve the current breaking purpose;
and step 3: controlling the water temperature in the circulating water tank to be between the upper limit value and the lower limit value of the water temperature;
and 4, step 4: adjusting the opening of the manual ball valve to enable the flow displayed by the flow meter to reach a flow value required by the test;
and 5: recording the display values of the first temperature sensor and the pressure sensor once a day, and recording the daily accumulated water quantity of each measured water meter;
step 6: and stopping the test after the total running time or the total on-off times of the test are reached.
When the water temperature, the liquid level, the flow value and the pressure value in the pipeline, the test running time and the test on-off times reach the set values in the step 1, the PLC controller sends out early warning information to the terminal and automatically processes or stops the terminal according to a preset program.
In step 3, the specific control process of the water temperature in the circulating water tank is as follows: when the water temperature reaches the upper limit value and needs to be cooled, a water inlet valve and a water discharge valve of the circulating water tank are opened, normal-temperature water enters the circulating water tank, high-temperature water in the circulating water tank is discharged, and the water temperature is gradually reduced; when the water temperature is reduced to the lower limit value, a water inlet valve and a water discharge valve of the circulating water tank are closed. Because the flow of inlet and outlet water is controlled by the inlet valve and the drain valve and is limited by working conditions, the flow can not be completely equivalent, and therefore, the safety control needs to be carried out by combining the upper limit value and the lower limit value of the liquid level: when the water temperature reaches the upper limit value and needs to be cooled, if the liquid level rises to the upper limit value, the water inlet valve is closed, and the drain valve is normally opened; if the liquid level is reduced to the lower limit value, the drain valve is closed firstly, if the circulating water tank is in water inlet state at the moment, the water inlet valve is still kept open, and when the liquid level reaches the upper limit value, the water inlet valve is closed again.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (10)
1. A durability test device of a water meter comprises: circulating water tank, vertical water pump (1), flowmeter (6), PLC controller (13), touch display screen and press from both sides table ware (4), its characterized in that still includes: the device comprises a constant-torque frequency converter (14), a vector motor (15), a first temperature sensor (3), a second temperature sensor (12), a pressure sensor (2) and a liquid level sensor (7);
the circulating water tank is communicated with a water inlet of the vertical water pump (1) through a first pipeline, a water outlet of the vertical water pump (1) is communicated with a water inlet of the meter clamping device (4) through a second pipeline, a water outlet of the meter clamping device (4) is communicated with the circulating water tank through a third pipeline, and the water meter to be measured (5) is clamped by the meter clamping device (4); a first temperature sensor (3) and a pressure sensor (2) are arranged on the second pipeline and close to the water inlet of the meter clamping device (4); a flowmeter (6) is arranged on the third pipeline and close to the water outlet of the meter clamping device (4); a second temperature sensor (12) and a liquid level sensor (7) are arranged in the circulating water tank; the circulating water tank is also communicated with a normal-temperature water tank through a water inlet valve (8), and the bottom of the circulating water tank is communicated with a drain pipe through a drain valve (9);
the PLC (13) is respectively connected with the touch display screen, the first temperature sensor (3), the second temperature sensor (12), the pressure sensor (2), the liquid level sensor (7), the flowmeter (6), the constant-torque frequency converter (14), the water inlet valve (8) and the water discharge valve (9); the constant-torque frequency converter (14) is connected with a vector type motor (15), and the vector type motor (15) is connected with the vertical water pump (1);
the PLC (13) controls the vertical water pump (1) to supply water by controlling the operation of the constant-torque frequency converter (14) and the vector type motor (15): during the continuous flow test, the vertical water pump (1) normally supplies water until the preset time of the continuous flow is reached; during the interrupted flow test, the flow continuing part and the vertical water pump (1) supply water normally; in the current cutoff part, a constant-torque frequency converter (14) instantaneously brakes the vertical water pump (1) through a vector type motor (15) in a resistance braking mode.
2. The durability test apparatus for a water meter recited in claim 1, wherein: and manual ball valves are arranged on the first pipeline, a second pipeline between the first temperature sensor (3) and the meter clamping device (4), a third pipeline between the meter clamping device (4) and the flowmeter (6) and a third pipeline between the flowmeter (6) and the circulating water tank.
3. The durability test apparatus for a water meter recited in claim 2, wherein: the PLC (13) is respectively connected with the first temperature sensor (3), the second temperature sensor (12) and the pressure sensor (2) through the communication module and the analog quantity module.
4. The durability test apparatus for a water meter recited in claim 3, wherein: the model of the analog quantity module is FX3u-4 AD-ADP.
5. The durability test apparatus for a water meter recited in claim 3, wherein: the model of the communication module is FX3u-485 ADP-MB.
6. The durability test apparatus for a water meter recited in claim 1, wherein: and the PLC (13) is connected with a terminal through a wireless DTU module.
7. The durability test apparatus for a water meter recited in claim 1, wherein: the constant-torque frequency converter (14) is in the model number FR-A840-00126.
8. A method of performing a durability test on a water meter using the durability test apparatus for a water meter of any one of claims 1-7, comprising:
step 1: setting test related parameters, wherein the parameters comprise an upper limit value and a lower limit value of water temperature in the circulating water tank, an upper limit value and a lower limit value of liquid level in the circulating water tank, an upper limit value and a lower limit value of water pressure in a pipeline, preset time of continuous flow, total test operation time and total test on-off times;
step 2: the water supply of the vertical water pump is controlled by controlling the operation of the constant-torque frequency converter and the vector type motor: during the continuous flow test, the vertical water pump normally supplies water until reaching the preset time of the continuous flow; during the interrupted flow test, the flow continuing part and the vertical water pump normally supply water; in the current breaking part, a constant-torque frequency converter instantaneously brakes the vertical water pump through a vector motor in a resistance braking mode to achieve the current breaking purpose;
and step 3: controlling the water temperature in the circulating water tank to be between the upper limit value and the lower limit value of the water temperature;
and 4, step 4: adjusting the opening of the manual ball valve to enable the flow displayed by the flow meter to reach a flow value required by the test;
and 5: recording the display values of the first temperature sensor and the pressure sensor once every a period of time, and recording the daily accumulated water quantity of each water meter to be measured;
step 6: and stopping the test after the total running time or the total on-off times of the test are reached.
9. The method for durability test of water meter as claimed in claim 8, wherein in step 3, the specific control process of the water temperature in the circulating water tank is as follows: when the water temperature reaches the upper limit value and needs to be cooled, a water inlet valve and a water discharge valve of the circulating water tank are opened, normal-temperature water enters the circulating water tank, high-temperature water in the circulating water tank is discharged, and the water temperature is gradually reduced; when the water temperature is reduced to the lower limit value, a water inlet valve and a water discharge valve of the circulating water tank are closed.
10. The method for testing the durability of a water meter as claimed in claim 9, wherein when the temperature of the water reaches the upper limit value and needs to be lowered, if the liquid level rises to the upper limit value, the water inlet valve is closed, and the drain valve is normally opened; if the liquid level is reduced to the lower limit value, the drain valve is closed firstly, if the circulating water tank is in water inlet state at the moment, the water inlet valve is still kept open, and when the liquid level reaches the upper limit value, the water inlet valve is closed again.
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