Hydraulic test system

Abstract

The utility model discloses a hydraulic test system adopting a water pump driven by a magnetic coupling as a pressure source. The hydraulic test system is provided with two water pressure systems with different water temperatures, namely a hot water system and a cold water system. Water is prevented from leaking from the sealing position of the transmission shaft and the shell of the pump. The hot water system and the cold water system respectively test a tested piece according to certain temperature, pressure and time control conditions, and quickly change water through the make-up pump according to the time condition, so that efficient temperature change (cold and hot water circulation) test on the tested piece is realized. The control can be realized by starting, stopping and rotating speed control of a plurality of motors by a controller, on-off control of a plurality of groups of electromagnetic stop valves and cooperation with other control valves.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydraulic control, and is mainly used for hydraulic test system. BACKGROUND

[0002] The development of national economy puts forward new problems of hydraulic test system for hydraulic control. Especially, with the development of water supply and drainage and fire fighting industry, the composite pipe material of carbon steel pipe embedding stainless steel thin-walled pipe is gradually developed, and higher requirements are put forward for the performance and detection of the pipe material. According to the current national standard test procedure, this test should make the measured part in the normal temperature water and hot water of (20±5) ℃ and (93±5) ℃, use (1.6±0.16) MPa internal pressure to carry out 2500 times of cyclic change, one cycle is (30±2) min, the cold and hot water each keeps 15 min, and the alternation of cold and hot water can be completed in 1 min. This requires that the test system can quickly switch the water temperature……; in addition, in some scenes, the power source needs to have pressure output capacity of 2.5Mpa or more, at this time, the conventional water centrifugal pump is difficult to meet this pressure requirement, and the conventional high-pressure plunger pump is difficult to meet the requirement of high temperature, and the conventional pump that can meet the pressure cannot be used in water system; therefore, further measures of the corresponding test system are taken……. SUMMARY

[0003] The hydraulic test system adopts the water pump driven by the magnetic coupling as the pressure source, and the passive side of the magnetic coupling is isolated in the pump, and the characteristics are that it has two water pressure systems with different water temperatures: hot water system and cold water system, which respectively provide hot water or cold water by the temperature control water tank, are connected by pipes in turn to the filter, the pump water inlet stop valve, the water pump driven by the magnetic coupling, the pump water outlet check valve, the measured part front stop valve, the measured part, the measured part rear stop valve, the throttle valve or the overflow valve of the valve group of the parallel bypass stop valve, and the water return stop valve, and the water is returned to the water tank through the pipe.

[0004] In this way, different combinations of on-off stop valves can be used to carry out cyclic test of different pressure parameters of hot and cold temperatures on the measured part. And the water pump driven by the magnetic coupling is used as the pressure source, which completely eliminates the leakage of the sealing part between the pump drive shaft and the shell, so that the working environment is easy to keep clean.

[0005] Preferably, the measured part front stop valve, the measured part, the measured part rear stop valve have multiple groups, each group is connected by pipes into a branch, and is connected in parallel between the intersection point after the check valve of the hot water pump and the cold water pump outlet and the intersection point before the throttle valve or the overflow valve of the valve group of the parallel bypass stop valve.

[0006] In this way, when a group of measured pieces are tested, other measured pieces can be pre-loaded when the measured piece front stop valve and the measured piece rear stop valve are closed; and after the previous measured piece is tested, the measured object is quickly switched by switching the different branch stop valves to continue testing; at the same time, the tested piece can be unloaded when a new object is tested; thus, the testing efficiency is improved.

[0007] Preferably, the stop valve used is a cone valve; in this way, there is no leakage when it is closed.

[0008] Preferably, the stop valve used is an electromagnetic stop valve.

[0009] In this way, when multiple cycles of testing are required, the controller can automatically power on or power off the corresponding electromagnetic stop valve according to the preset program, predetermined pressure, time, temperature, and other conditions, so as to connect or disconnect the water path and supply hot water or cold water; the measured piece is automatically tested according to the specified cycle process.

[0010] Preferably, the sealing member used in the components of the hot water system is a fluorine rubber sealing member; in this way, it can withstand the high temperature of hot water and has a long service life.

[0011] Preferably, the pump driven by the magnetic coupling of the hot water or cold water system further has a connected water replenishment centrifugal pump; each pump is connected with a respective water outlet check valve to form a branch, and is connected in parallel between the intersection point after the pump water inlet stop valve and the water outlet intersection point of the pump rear check valve.

[0012] In this way, when the hot water or cold water system alternately cycles according to the test procedure, the centrifugal pump can be used to quickly complete the replacement of the hot water or cold water system by cooperating with the related stop valve, so that the temperature conditions of the new test step meet the requirements and enter the test, which ensures that the test procedure is correctly, safely, and efficiently implemented.

[0013] Preferably, the hydraulic test system uses ceramic material moving pair parts between the high and low pressure areas of the water pump driven by the magnetic coupling.

[0014] Preferably, the hydraulic test system uses a gear pump driven by a magnetic coupling, and the pump uses ceramic material gear shaft and bearing to withstand high temperature, not easy to wear and long service life. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A schematic diagram of a test system for a stainless steel clamp and press type pipe fitting assembly temperature change (hot and cold water circulation) test. DETAILED DESCRIPTION

[0016] According to the current national standard test procedure, this test shall be performed on the test piece under the condition of (20±5)℃ and (93±5)℃ of normal temperature water and hot water, with (1.6±0.16)MPa internal pressure, 2500 cycles of change, one cycle being (30±2)min, 15min for each of cold and hot water, and the alternation of cold and hot water being completed within 1min.

[0017] In order to illustrate the specific embodiment of the test system for the temperature change (cold and hot water circulation) test of the present application, please see the following Figure 1 .

[0018] The test system has two water pressure systems with different water temperatures: hot water system and cold water system, which are respectively composed of temperature control water tanks 1.1 and 1.2, filters 2.1 and 2.2, pump water inlet stop valves 3.1 and 3.2, water pump sets 4.1 and 4.2 driven by motors and magnetic coupling joints, pump water outlet check valves 5.1 and 5.2, test piece front stop valves 6.a, 6.b and 6.c, test pieces 7.a, 7.b and 7.c, test piece rear stop valves 8.a, 8.b and 8.c, throttle valve 10 of parallel bypass stop valve 9, water return stop valves 11.1 and 11.2, and sequentially connected pipelines, and finally connected water return tanks.

[0019] The magnetic coupling joint used in the test system is used as the transmission connecting part between the original motor and the pump, and the driven side of the magnetic coupling joint is isolated from the gear pump in the pump, which completely eliminates the leakage at the sealing part between the pump transmission shaft and the shell, makes the working environment easy to keep clean, and uses ceramic gear shaft and bearing for the gear pump, which makes it resistant to high temperature, not easy to wear and tear, and has long service life.

[0020] The above-mentioned components of the test system, the devices with part number subscript 1 belong to the hot water system, and the devices with part number subscript 2 belong to the cold water system. The hot water tank 1.1 is controlled by its own temperature control system, and the water temperature is controlled at (89-98℃). The cold water tank 1.2 is controlled by its own temperature control system, and the water temperature is controlled at (16-24℃). In addition, there is a branch composed of a motor and a water replenishment centrifugal pump set 4.3 and its pump water outlet check valve 5.3, which is connected in parallel with the hot water pump and the cold water pump branch between the intersection point after the water inlet stop valves 3.1 and 3.2 of the pump and the intersection point after the pump water outlet check valves 5.1 and 5.2.

[0021] In this way, the system can make the test piece be in different water temperature environment through the switching of the stop valves, and can quickly complete the replacement of the hot water system and the cold water system with a larger flow, a suitable lower pressure and a suitable lower pressure by switching the water replenishment centrifugal pump, so that the temperature conditions of the new test step meet the standard and enter the test, which ensures that the test procedure is correctly, safely and efficiently implemented.

[0022] And, in the pipe directly connected to the junction point after the one-way valves 5.1, 5.2 and 5.3 of the pump outlet, a pressure sensor 12 and a temperature sensor 13a are installed, and in the pipe before the junction point before the backwater stop valves 11.1 and 11.2, a temperature sensor 13b is installed.

[0023] Besides, a controller is provided, whose input signal end receives corresponding pressure signals and temperature signals from the pressure sensor 12 and the temperature sensors 13a and 13b, and whose output end is connected to each pump motor and electromagnetic stop valve to control their operation or state.

[0024] The pressure sensor 12 is used to sense the pressure of the measured object (at this time, the corresponding pre-stop valve of the measured object, for example, 6a, must be opened); and the valve group of the throttle valve 10 in parallel with the bypass stop valve 9 is used as a pressure regulating means: when the water in the water tank is replaced by using the water replenishing centrifugal pump 4.3, the corresponding pre-stop valve and post-stop valve of the measured object (for example, 6a and 8a), the bypass stop valve 9, and the corresponding backwater stop valve (for example, 11.1 or 11.2) are opened, so as to reduce the resistance as much as possible, to make the water replacement smooth and low in energy consumption.

[0025] The temperature sensors 13a and 13b are used to observe the temperature change in the water replacement process, and when it is known that the temperature after the water replacement meets the standard, the hot water system or the cold water system is switched to work. When the hot water system is switched to work, the pump inlet stop valve 3.1 is opened, the pump inlet stop valve 3.2 is closed, the backwater stop valve 11.1 is opened, the backwater stop valve 11.2 is closed, and only the water pump group 4.1 driven by the motor and the magnetic coupling is started to work; at this time, the product of the liquid resistance of the throttle valve 10 and the flow rate determines the pressure of the measured object, and the flow rate can be regulated by regulating the rotating speed of the motor and the magnetic coupling driven water pump group, which is a variable frequency motor and whose rotating speed is controllable, so that the pressure of the measured object can be conveniently regulated within the range of (1.6±0.16) MPa according to the pressure measured by the pressure sensor 12 (or perhaps a higher pressure of 2.5 MPa is required in some test working conditions).

[0026] Another method is also available, in which the throttle valve 10 is replaced by an overflow valve; at this time, the pump motor does not have to be a variable frequency motor that can regulate the rotating speed, but only needs to be a common asynchronous motor, so that the pump generates a smaller flow rate, the overflow valve is in an open working state, and the opening pressure is regulated within the range of (1.6±0.16) MPa.

[0027] The controller also controls the water temperature of the hot water tank and the cold water tank.

[0028] The test at least includes the following steps:

[0029] 1 Preparation: all the stop valves are in the closed state. After the power is on, the controller controls the water volume and temperature of the hot water tank and the cold water tank to meet the standards (89-98℃) and (16-24℃). Install a test piece, for example, install test piece 7.a between stop valves 6.a and 8.a.

[0030] 2. Cold water system works; 15 minutes

[0031] 3. Water change; 1 minute

[0032] 4. Hot water system works; 15 minutes

[0033] 5. Water change; 1 minute

[0034] 6. Cold water system works; 15 minutes

[0035] …… Return to step 3 until 2500 cycles.

[0036] During the above-mentioned cycle test, test piece 7.b can be installed between stop valves 6.b and 8.b. When test piece 7.a completes the cycle test, test piece 7.b can immediately replace test piece 7.a by opening stop valves 6.b and 8.b and closing stop valves 6.a and 8.a, and a new cycle test can begin. …… and so on.

[0037] In this way, the (cold and hot water cycle) test can be more efficiently realized according to the test procedures of the national standard.

[0038] In the above-mentioned embodiment, technical details that are necessarily known by skilled persons are omitted, such as water level adjustment and temperature adjustment in the hot water tank or the cold water tank, mesh number of the filter, and arrangement of multiple places, and as long as these possible detail changes are not a substantial innovation within the scope of the claims, they are still within the protection scope of the present application.

Claims

1. A hydraulic testing system which employs a magnetic coupling driven water pump as a pressure source and in which the passive side of the magnetic coupling is isolated from the pump, characterised in that, It has two different water temperature water pressure system: hot water system and cold water system, respectively by temperature control water tank provides hot water or cold water, in turn with the pipeline connection filter, pump water inlet valve, magnetic coupling transmission water pump, pump outlet check valve, measured piece before the stop valve, measured piece, measured piece after the stop valve, parallel bypass stop valve throttle or overflow valve valve group, backwater stop valve, and through the pipeline, let water back into the original temperature control water tank.

2. The hydraulic test system of claim 1, wherein, The measured piece before the stop valve, measured piece, measured piece after the stop valve has multiple groups, each group is connected by pipeline into a branch, and is connected in parallel between the intersection point after the hot water pump and the cold water pump outlet check valve and the intersection point before the throttle or overflow valve valve group of the parallel bypass stop valve.

3. The hydraulic test system of claim 1, wherein, The stop valve is a cone valve.

4. The hydraulic test system of claim 1, wherein, The stop valve is an electromagnetic stop valve.

5. The hydraulic test system of claim 1, wherein, The sealing member used in the components of the hot water system adopts a fluorine rubber sealing member.

6. The hydraulic test system of claim 1, wherein, The hot water or cold water system has a connected water supplement centrifugal pump outside the magnetic coupling transmission pump, and each pump constitutes a branch with the water outlet check valve thereof and is connected in parallel between the intersection point after the pump water inlet stop valve and the water outlet intersection point of the pump outlet check valve.

7. The hydraulic test system of claim 1, wherein, The high and low pressure areas in the magnetic coupling transmission water pump adopt ceramic material moving pair parts.

8. The hydraulic test system of claim 1, wherein, The magnetic coupling transmission water pump is a gear pump, and the pump adopts a ceramic material gear shaft and bearing.

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