Test system and test method for verifying reverse blowing capacity of siphon breaking device under low pressure

Abstract

The invention provides a test system and a test method for verifying the reverse blowing capacity of a siphon breaking device under low pressure. The test system comprises a siphon breaking device, a low-pressure test tank and a discharge pipeline. Wherein a working medium is contained in the low-pressure test tank. And the siphon breaking device is arranged in the low-pressure test tank. The siphon breaking device is connected with the discharge pipeline, and the discharge pipeline is communicated with the outside of the low-pressure test tank. And the discharge pipeline is provided with a crevasse simulation structure. Under the action of pressure difference generated by the crevasse simulation structure, the working medium in the low-pressure test tank is discharged out of the low-pressure test tank from the siphon breaking device through the discharge pipeline so as to obtain test data of the siphon breaking device, and then the reverse blowing capacity of the siphon breaking device under low pressure is obtained. The test system can test and verify the ability of the siphon breaking device to alleviate a break accident under a low pressure condition, and is reasonably designed.

Description

Technical Field

[0001] The invention relates to a siphon breaking device for a heating reactor, and in particular to a test system and a test method for verifying the reverse spraying capability of the siphon breaking device under low pressure. Background Art

[0002] When starting up an integrated natural circulation small reactor, hot water needs to be injected from the outside to make the reactor reach a state close to that during stable operation. The injection system is inserted from the top of the RPV (Reactor Pressure Vessel) to the RPV core. This inlet pipe is the lowest pipe. If a rupture occurs at the RPV outlet of this pipe, a low-level rupture will be formed. Under the action of siphon, the low-level rupture causes the system liquid level to drop rapidly and continuously, and the injected supercooled water may also flow out of the system through the rupture. When a rupture occurs in the injection pipe outside the RPV, due to the high pressure inside the RPV, the coolant inside the RPV will flow in the reverse direction in the injection pipe and flow out from the rupture under the action of high pressure. This process is called reverse spraying. Therefore, in order to alleviate the serious consequences that may be caused by the low-level rupture, a siphon destruction device needs to be installed on the inlet pipe of the startup system.

[0003] In the current research and design process, the simulation of the siphon breaking device mainly relies on CFD (Computational Fluid Dynamics), and the geometric structure of the siphon breaking device model is adjusted to make its design meet the requirements. However, the calculation of CFD depends largely on the existing test results for correction. The different models and parameters set in CFD are theoretical choices. In the actual injection process, more factors need to be considered. Therefore, the test situation can truly reflect the real effect of the siphon breaking device. The test results can be used to verify the calculation results of CFD to ensure the optimization of the selection of different CFD parameters.

[0004] However, there is currently no test system or corresponding test data to simulate the rupture of the injection pipeline outside the RPV under low-pressure conditions by the siphon breaking device. In addition, there are many design parameters and factors that affect the siphon breaking performance in the siphon breaking device. As a result, siphon breaking devices of different specifications have different reverse spraying capabilities under low pressure, which brings difficulties to the subsequent system program model implantation, program verification and CFD simulation program development. Summary of the invention

[0005] The purpose of the present invention is to provide a test system and a test method for verifying the reverse spraying capability of a siphon destroying device under low pressure, which can test and verify the mitigation capability of the siphon destroying device for breach accidents under low pressure conditions and make a reasonable design.

[0006] One aspect of the present invention provides a test system for verifying the reverse spraying capability of a siphon breaking device under low pressure, comprising a siphon breaking device, a low-pressure test tank and a discharge pipe; wherein the low-pressure test tank contains a working fluid; the siphon breaking device is arranged in the low-pressure test tank; the siphon breaking device is connected to the discharge pipe, and the discharge pipe is connected to the outside of the low-pressure test tank; the discharge pipe is provided with a rupture simulation structure; under the action of the pressure difference generated by the rupture simulation structure, the working fluid in the low-pressure test tank is discharged from the siphon breaking device through the discharge pipe to the outside of the low-pressure test tank, so as to obtain the test data of the siphon breaking device, and then obtain the reverse spraying capability of the siphon breaking device under low pressure.

[0007] In one embodiment, the breach simulation structure includes an adjustable orifice plate, and the adjustable orifice plate is provided with a through hole adapted to the size of the breach; the adjustable orifice plate is arranged in the discharge pipe outside the low-pressure test tank.

[0008] In one embodiment, the discharge pipeline includes a downstream pipeline and a connecting pipeline; the inlet of the downstream pipeline is connected to the first port of the siphon breaking device, and the outlet of the downstream pipeline is connected to the inlet of the connecting pipeline; the test system also includes an upstream pipeline located in the low-pressure test tank; the outlet of the upstream pipeline is connected to the second port of the siphon breaking device; the inlet of the upstream pipeline can contact the working fluid in the low-pressure test tank.

[0009] In one embodiment, the upstream pipeline is provided with a combination of one or more of a temperature sensor, a pressure sensor, a differential pressure sensor and a flow sensor; and / or the downstream pipeline is provided with a combination of one or more of a temperature sensor, a pressure sensor, a differential pressure sensor and a flow sensor; and / or the siphon breaking device is provided with a combination of one or more of a temperature sensor, a pressure sensor, a differential pressure sensor and a flow sensor.

[0010] In one embodiment, the first port of the siphon breaking device is threadedly connected to the inlet of the downstream pipe; and / or the second port of the siphon breaking device is threadedly connected to the outlet of the upstream pipe.

[0011] In one embodiment, the adjustable orifice is disposed in the downstream pipeline outside the low-pressure test tank; the breach simulation structure further includes a connecting flange, and the adjustable orifice is disposed in the downstream pipeline through the connecting flange.

[0012] In one embodiment, the test system further comprises a first valve, which is arranged in a position of the downstream pipeline on the upstream side of the adjustable orifice plate; and / or the test system further comprises a second valve, which is arranged in the connecting pipeline.

[0013] In one embodiment, the test system further includes a discharge tank, the outlet of the connecting pipe is connected to the discharge tank, and the discharge tank is used to store the working fluid discharged from the connecting pipe.

[0014] In one embodiment, the low-pressure test tank is provided with an openable or closable window; the height positions of the window and the siphon breaking device in the low-pressure test tank are matched.

[0015] In one embodiment, the test system also includes a hot water boiler subsystem for adjusting the temperature inside the low-pressure test tank, and the low-pressure test tank is provided with a first inlet, which is connected to the hot water boiler subsystem; and / or the test system also includes a pressure regulating subsystem for adjusting the pressure inside the low-pressure test tank, and the low-pressure test tank is provided with a second inlet, which is connected to the pressure regulating subsystem.

[0016] Another aspect of the present invention provides a test method for verifying the reverse spraying capability of a siphon destroying device under low pressure, which is applied to a test system for verifying the reverse spraying capability of a siphon destroying device under low pressure as described in any one of the above embodiments; the test method comprises: injecting a working fluid into a low-pressure test tank; adjusting the temperature and pressure in the low-pressure test tank to a preset test temperature and a preset test pressure, respectively; after the pressure, liquid level and temperature of the working fluid in the low-pressure test tank are stable, controlling the working fluid in the low-pressure test tank to be discharged from the siphon destroying device through a discharge pipe to the outside of the low-pressure test tank under the action of the pressure difference generated by the rupture simulation structure; obtaining the test data of the siphon destroying device, and then obtaining the reverse spraying capability of the siphon destroying device under low pressure.

[0017] The test system for verifying the reverse blowing capability of the siphon destroying device under low pressure of the present invention simulates the breach in a real breach accident through a breach simulation structure, and can obtain the test data, the siphon destruction development process and key phenomena of the siphon destroying device with different design parameters when the injection pipeline outside the RPV is breached under low pressure conditions, so as to evaluate and reasonably design the siphon destroying device, realize the experimental verification of the influence of the siphon destroying device structure with different design parameters under different thermal-hydraulic parameter conditions on the siphon destruction, and provide a basis for the subsequent system program model implantation, program verification and CFD simulation program development, so as to alleviate the reactor safety problems caused by low-level breaches. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which: Figure 1is a schematic diagram of an embodiment of a test system for verifying the reverse spraying capability of a siphon breaking device under low pressure according to the present invention; Figure 2 yes Figure 1 The schematic diagram of the arrangement of measuring points of the siphon breaking device of the test system shown; Figure 3 yes Figure 2 The structural schematic diagram of the siphon breaking device shown; Figure 4 It is a flow chart of an embodiment of a test method for verifying the reverse spraying capability of a siphon breaking device under low pressure according to the present invention. DETAILED DESCRIPTION

[0019] In the current research and design process, the simulation of the siphon breaking device mainly relies on CFD, and the geometric structure of the model of the siphon breaking device is adjusted to make its design meet the requirements. However, the calculation of CFD depends largely on the existing test results for correction. The different models and parameters set in CFD are theoretical choices. In the actual injection process, more factors need to be considered. For example, whether the nozzle of the siphon breaking device is aligned with the mixing section, installation error, manufacturing tolerance, etc., the actual temperature of the liquid is not constant, and the surface roughness of the pipeline may be different from the value selected in the calculation process. Therefore, the test situation can truly reflect the real effect of the siphon breaking device. The test results can be used to check the calculation results of CFD to ensure the optimization of the selection of different parameters of CFD. However, due to the manufacturing cycle and cost reasons, the siphon breaking device may have dozens of different design parameters in the design process, and it cannot be completely simulated The actual proportion of the actual reactor is processed and manufactured. Therefore, it is necessary to adjust the design of the siphon breaking device with the help of CFD calculation results and obtain an optimal design.

[0020] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the present invention, not to limit the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature illustrated or described as part of one embodiment may be used together with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover these modifications and variations within the scope of the appended claims and their equivalents.

[0021] As used herein, the terms "first", "second" and "third" may be used interchangeably to distinguish one component from another, and are not intended to indicate the location or importance of the respective components. The terms "upstream" and "downstream" refer to the relative direction of the flow of the working fluid in the working fluid path. For example, "upstream" refers to the direction from which the working fluid flows, and "downstream" refers to the direction to which the working fluid flows.

[0022] Figure 1 An embodiment of the test system for verifying the reverse spraying capability of the siphon breaking device under low pressure of the present invention is shown. Figure 1 As shown, the test system includes a siphon destruction device 100, a low-pressure test tank 200 and a discharge pipe 300. Among them, the low-pressure test tank 200 is used to simulate RPV (Reactor Pressure Vessel), which can withstand certain pressure and temperature. The low-pressure test tank 200 contains a working fluid (not shown). The working fluid in the present invention is a coolant fluid; specifically, the working fluid in the low-pressure test tank 200 is water. The test system also includes a hot water boiler subsystem 610 (the water temperature and liquid level of the coolant in the low-pressure test tank 200 can be accurately controlled by the hot water boiler subsystem 610), and the low-pressure test tank 200 is provided with a first inlet 210. The hot water boiler subsystem 610 is connected to the first inlet 210 to inject the working fluid into the low-pressure test tank 200.

[0023] The siphon breaking device 100 is arranged in the low-pressure test tank 200. The siphon breaking device 100 is connected to the discharge pipe 300, and the discharge pipe 300 is connected to the outside of the low-pressure test tank 200. The discharge pipe 300 is provided with a breach simulation structure 400. The breach simulation structure 400 is used to simulate the breach of the injection pipe outside the RPV. Under the pressure difference generated by the breach simulation structure 400, the working fluid in the low-pressure test tank 200 is discharged from the siphon breaking device 100 through the discharge pipe 300 to the outside of the low-pressure test tank 200 (that is, the working fluid flows from the inside of the low-pressure test tank 200 to the outside of the low-pressure test tank 200 during the test), so as to obtain the test data of the siphon breaking device 100, and then obtain the reverse spraying capability of the siphon breaking device 100 under low pressure.

[0024] The test system for verifying the reverse spraying capability of the siphon destroying device 100 under low pressure of the present invention simulates the breach in a real breach accident through the breach simulation structure 400, and can obtain the test data of the breach of the injection pipeline outside the RPV of the siphon destroying device 100 with different design parameters, the development process of siphon destruction and key phenomena, and then reasonably design the siphon destroying device 100, and experimentally verify the influence of the siphon destroying device structure with different design parameters on the siphon destruction under different thermal-hydraulic parameter conditions, so as to provide a basis for the subsequent system program model implantation, program verification and CFD simulation program development, so as to alleviate the reactor safety problems caused by low-level breaches.

[0025] The reverse spraying capability of the siphon destroying device 100 under low pressure obtained by the test system of the present invention includes but is not limited to the spraying flow rate and the phenomenon during spraying. Since the phenomenon during spraying is an unknown phenomenon, there is no test system or method to observe or verify the phenomenon.

[0026] The structure of the siphon destroying device 100 of the present invention is as follows: Figure 2 As shown, the siphon destruction device 100 includes a first port 110 (also called an inlet), a nozzle 120, a suction port 130, a mixing section 140, a diffusion section 150 and a second port 160 (also called an outlet) from top to bottom. When the injection pipeline is injected forward, that is, when the injection fluid is injected from the off-pillar pipeline, it enters the mixing section 140 after being accelerated by the nozzle 120. Under the action of the Bernoulli principle, the working fluid inside the RPV with a lower pressure is sucked into the mixing section 140 from the suction port 130. After the injected high-temperature liquid and the sucked working fluid are fully mixed in the mixing section 140, they enter the diffusion section 150, further reducing the flow rate and increasing the pressure. Through reasonable design, the fluid entering the receiving chamber (i.e., the mixing section 140) from the suction port 130 can be much lower than the fluid entering the receiving chamber from the nozzle 120, and the flow will not be interrupted at the break between the nozzle 120 and the receiving chamber.

[0027] When a rupture occurs in the injection pipe outside the RPV, due to the high pressure inside the RPV, the coolant inside the RPV will flow in the reverse direction in the injection pipe under the action of high pressure and flow out from the rupture. This process is called reverse spraying. When the reverse spraying continues until the liquid level in the low-pressure test tank 200 drops to the height of the suction port 130 of the siphon destroying device 100, air enters the siphon destroying device 100 through the broken suction port 130. After entering, the air mixes with the fluid in the siphon destroying device 100 to form a two-phase flow, destroying the negative pressure state of the siphon flow. The negative pressure originally generated by the siphon effect is the driving force that enables the liquid to overcome gravity and flow upward. After the negative pressure is destroyed, the siphon phenomenon stops, thereby avoiding the reverse spraying phenomenon caused by the siphon.

[0028] In one embodiment, the test system further includes a pressure regulating subsystem 620 for regulating the pressure in the low-pressure test tank 200. The low-pressure test tank 200 is provided with a second inlet 220, and the second inlet 220 is connected to the pressure regulating subsystem 620. The working pressure in the low-pressure test tank 200 can be accurately controlled by the pressure regulating system.

[0029] like Figure 1 As shown, the discharge pipeline 300 includes a downstream pipeline 310 and a connecting pipeline 320. The inlet of the downstream pipeline 310 is connected to the first port 110 of the siphon breaking device 100, and the outlet of the downstream pipeline 310 is connected to the inlet of the connecting pipeline 320. The test system also includes an upstream pipeline 500 located in the low-pressure test tank 200. The outlet of the upstream pipeline 500 is connected to the second port 160 of the siphon breaking device 100. The inlet of the upstream pipeline 500 can contact the working medium in the low-pressure test tank 200, such as Figure 1 As shown, the inlet of the upstream pipeline 500 is close to the bottom of the low-pressure test tank 200 , thereby allowing the working fluid to enter the siphon breaking device 100 .

[0030] like Figure 1 As shown, the siphon breaking device 100 is vertically fixed in the low pressure test tank 200 and is tightly connected to the upstream pipe 500 and the downstream pipe 310. The siphon breaking device 100 can be fixed in the low pressure test tank 200 by a fixing bracket (not shown).

[0031] The test system of the present invention needs to verify the reverse spraying capability of the siphon destroying device 100 with different design parameters under low pressure. Therefore, the siphon destroying device 100 is detachably connected to the upstream pipe 500 and the downstream pipe 310. Specifically, the first port 110 of the siphon destroying device 100 and the inlet of the downstream pipe 310 can be threadedly connected, and the second port 160 of the siphon destroying device 100 and the outlet of the upstream pipe 500 can be threadedly connected. The siphon destroying device 100 is fixed to the upstream pipe 500 and the downstream pipe 310 by threaded connection, and has the characteristics of easy replacement, large number of single tests, flexible measurement quantity, high accuracy, etc.

[0032] In one embodiment, in order to obtain test data of the siphon breaking device 100, a plurality of measuring points are provided in the upstream pipeline 500, the downstream pipeline 310 and the siphon breaking device 100, that is, the upstream pipeline 500 and / or the downstream pipeline 310 and / or the siphon breaking device 100 are provided with a combination of one or more of a temperature sensor, a pressure sensor, a differential pressure sensor and a flow sensor.

[0033] Figure 3 The measurement point arrangement of the upstream pipeline 500, the downstream pipeline 310 and the siphon breaking device 100 is shown. Figure 3As shown in the figure, DP (Differential Pressure) represents the differential pressure sensor, T (Temperature) represents the temperature sensor, P (Pressure) represents the pressure sensor, and F (Flow) represents the flow sensor. Figure 3 The numbers after the letters corresponding to the above four sensors represent the numbers of the sensors (i.e., measuring points), such as T01 can be understood as the first temperature sensor.

[0034] like Figure 3 The pressure-leading pipe and signal line of the sensor shown can be led to the outside through the through-sealing device (not shown) on the low-pressure test tank 200, and connected to the external data acquisition system (not shown), so as to facilitate the data acquisition and measurement of the temperature, pressure, pressure difference and flow rate in the tank. In this way, key experimental data such as the pressure, temperature distribution and flow rate inside the siphon device can be obtained, so as to obtain the flow change, pressure drop distribution and temperature distribution of the coolant in the upstream pipeline 500, the downstream pipeline 310 and the siphon breaking device 100.

[0035] In one embodiment, the breach simulation structure 400 includes an adjustable orifice plate 410, and the adjustable orifice plate 410 is provided with a through hole 420 adapted to the size of the breach. The adjustable orifice plate 410 is disposed in the discharge pipe 300 located outside the low-pressure test tank 200. Specifically, the adjustable orifice plate 410 is disposed in the downstream pipe 310 located outside the low-pressure test tank 200. The breach simulation structure 400 also includes a connecting flange (not shown), and the adjustable orifice plate 410 is disposed in the downstream pipe 310 through the connecting flange.

[0036] There are multiple adjustable orifice plates 410, and the diameter of the through hole 420 of each adjustable orifice plate 410 is different. By replacing the adjustable orifice plates 410 with through holes 420 of different diameters, the breaches of different diameters in the LOCA accident (Loss of Coolant Accident) can be truly simulated, so as to explore the effect of reverse spraying under different breach diameters through experiments.

[0037] The test system further includes a first valve 710, which is disposed in the downstream pipeline 310 at the upstream side of the adjustable orifice plate 410. The test system further includes a second valve 720, which is disposed in the connecting pipeline 320. The first valve 710 and the second valve 720 can be selected as quick-opening valves, which can be combined with the adjustable orifice plate 410 to truly simulate the sudden situation of LOCA accidents.

[0038] A third valve 730 is also provided upstream of the pressure regulating subsystem 620 for controlling the intake air flow rate.

[0039] like Figure 1As shown, the test system further includes a discharge tank 900, the outlet of the connecting pipe 320 is connected to the discharge tank 900, and the discharge tank 900 is used to store the working fluid discharged from the connecting pipe 320. The discharge tank 900 is provided with a liquid level sensor and a drain valve 910. The liquid level sensor can monitor the liquid level of the working fluid in the discharge tank 900 that is reversely sprayed into the discharge tank 900 in real time.

[0040] In one embodiment, the low pressure test tank 200 is provided with an openable or closable window 800. The window 800 may be a hand hole, which can facilitate the replacement of siphon breaking devices 100 with different design parameter structures.

[0041] Furthermore, the hand hole is provided with a transparent window door that can be opened and closed. The hand hole provided with the transparent window door can also serve as a visual window, so that visual observation can be performed to observe the development process of siphon destruction and key phenomena (i.e., the phenomena during the spraying as described above). The height positions of the window 800 and the siphon destruction device 100 in the low-pressure test tank 200 are matched, that is, the heights of the window 800 and the siphon destruction device 100 are aligned, so that the flow pattern changes and flow field of the siphon destruction device 100 can be observed through an external high-speed camera system.

[0042] It can be understood that the pressure in the low-pressure test tank 200 of the present invention is relatively low, and it is feasible to open the window 800 in the low-pressure test tank 200 .

[0043] The test system of the present invention has the following structures in sequence through which the working fluid is reversely sprayed during the test process: upstream pipeline 500-second port 160 of siphon breaking device 100-first port 110 of siphon breaking device 100-downstream pipeline 310-first valve 710-adjustable orifice plate 410-connecting pipeline 320-second valve 720-discharge tank 900.

[0044] Figure 4 The test method of the present invention for verifying the reverse spraying capability of the siphon breaking device 100 under low pressure is shown. The test method of the present invention is applied to the test system for verifying the reverse spraying capability of the siphon breaking device 100 under low pressure as described in any of the above embodiments.

[0045] like Figure 4 As shown, the test method of the present invention includes steps S100 to S400: In step S100 , the working medium is injected into the low-pressure test tank 200 . The hot water boiler subsystem injects the working medium into the low-pressure test tank 200 through the first inlet 210 on the low-pressure test tank 200 .

[0046] Before step S100, a test system needs to be built. Specifically, the siphon breaking device 100 is tightly and fixedly connected to the upstream pipeline 500 with various measuring points installed and the downstream pipeline 310 with various measuring points installed, and various measuring points are installed on the siphon breaking device 100. The pressure-inducing pipe and signal line of each measuring point are led to the outside of the tank through the through-sealing device on the low-pressure test tank 200 and connected to the external data acquisition system; then the adjustable orifice plate 410 is installed at the downstream position of the connecting pipeline 320 and the first valve 710.

[0047] In step S200, the temperature and pressure in the low-pressure test tank 200 are adjusted to a preset test temperature and a preset test pressure, respectively.

[0048] Among them, the coolant of preset temperature is injected into the low-pressure test tank 200 to a preset liquid level through the hot water boiler subsystem; the first valve 710 on the connecting pipe 320 and the valve on the hot water boiler subsystem are closed; and gas is injected through the pressure regulating subsystem 620 to adjust the pressure in the low-pressure test tank 200 to the preset test pressure.

[0049] In step S300 , after the pressure, liquid level and temperature of the working fluid in the low-pressure test tank 200 are stabilized, the working fluid in the low-pressure test tank 200 is controlled to be discharged from the siphon destruction device 100 through the discharge pipe 300 to the outside of the low-pressure test tank 200 under the pressure difference generated by the breach simulation structure 400 .

[0050] Among them, after the pressure, liquid level and temperature of the working fluid in the low-pressure test tank 200 are stabilized, the first valve 710 on the connecting pipe 320 is opened, and the coolant in the low-pressure test tank 200 is discharged to the discharge tank 900 through the siphon destruction device 100 under the action of the internal and external pressure difference.

[0051] In step S400, test data of the siphon breaking device 100 is obtained, and then the reverse spraying capability of the siphon breaking device 100 under low pressure is obtained.

[0052] Among them, by recording the test data of each measuring point on the siphon breaking device 100, the upstream pipeline 500 and the downstream pipeline 310 during the discharge test, the performance parameters of the siphon breaking test body under the preset working pressure, cooling temperature, the size of the adjustable orifice plate 410 and the coolant level conditions can be obtained, including but not limited to the spraying flow rate and the phenomenon during the spraying. By changing experimental conditions such as working pressure, cooling temperature, size of adjustable orifice plate 410 and coolant level, the complete reverse spraying capability of the siphon destroying device 100 can be obtained to determine whether the flow rate of the siphon destroying device 100 and the phenomenon during spraying meet the expected requirements.

[0053] By replacing the siphon breaking device 100 with different design parameters and repeating the steps S100 to S400 of the above test method, an optimal design parameter combination of the siphon breaking device 100 can be obtained, thereby realizing a reasonable design of the siphon breaking device 100.

[0054] The present invention verifies the influence of the siphon breaking device 100 structure with different design parameters under different thermal hydraulic parameter conditions on siphon breaking, which can provide a basis for subsequent system program model implantation, program verification and CFD simulation program development.

[0055] Among them, the design parameters of the siphon breaking device 100 include but are not limited to the inlet pipe diameter, the outlet pipe diameter, the nozzle 120 diameter, the nozzle 120 inclination angle, the suction port 130 inclination angle, the mixing section 140 diameter, the diffusion section 150 diameter and the distance between the nozzle 120 and the suction port 130.

[0056] The test system of the present invention can accurately adjust key test parameters such as test pressure, coolant temperature, liquid level, diameter of through hole 420 of adjustable orifice plate 410, and can obtain the complete reverse spraying capability of siphon breaking device 100 under low pressure. The test system of the present invention can be reused many times, which can greatly reduce the test cost.

[0057] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A test system for verifying the reverse spraying capability of a siphon breaking device under low pressure, characterized in that: It includes a siphon breaking device, a low-pressure test tank and a discharge pipe; among which, The low-pressure test tank contains a working medium; The siphon breaking device is arranged in the low-pressure test tank; The siphon breaking device is connected to the discharge pipe, and the discharge pipe is connected to the outside of the low-pressure test tank; The discharge pipe is provided with a breach simulation structure; Under the action of the pressure difference generated by the rupture simulation structure, the working fluid in the low-pressure test tank is discharged from the siphon breaking device through the discharge pipe to the outside of the low-pressure test tank, so as to obtain the test data of the siphon breaking device, and then obtain the reverse spraying capability of the siphon breaking device under low pressure.

2. The test system according to claim 1, characterized in that: The breach simulation structure comprises an adjustable orifice plate, wherein the adjustable orifice plate is provided with a through hole adapted to the size of the breach; The adjustable orifice plate is arranged on the discharge pipe outside the low-pressure test tank.

3. The test system according to claim 2, characterized in that: The discharge pipeline includes a downstream pipeline and a connecting pipeline; The inlet of the downstream pipeline is connected to the first port of the siphon breaking device, and the outlet of the downstream pipeline is connected to the inlet of the connecting pipeline; The test system also includes an upstream pipeline located in the low-pressure test tank; The outlet of the upstream pipeline is connected to the second port of the siphon breaking device; The inlet of the upstream pipeline can contact the working medium in the low-pressure test tank.

4. The test system according to claim 3, characterized in that: The upstream pipeline is provided with a combination of one or more of a temperature sensor, a pressure sensor, a differential pressure sensor and a flow sensor; and / or The downstream pipeline is provided with a combination of one or more of a temperature sensor, a pressure sensor, a differential pressure sensor and a flow sensor; and / or The siphon breaking device is provided with a combination of one or more of a temperature sensor, a pressure sensor, a differential pressure sensor and a flow sensor.

5. The test system according to claim 3 or 4, characterized in that: The first port of the siphon breaking device is threadedly connected to the inlet of the downstream pipeline; and / or The second port of the siphon breaking device is threadedly connected to the outlet of the upstream pipeline.

6. The test system according to claim 3 or 4, characterized in that: The adjustable orifice plate is disposed on the downstream pipeline outside the low-pressure test tank; The breach simulation structure further includes a connecting flange, and the adjustable orifice plate is arranged on the downstream pipeline via the connecting flange.

7. The test system according to claim 3 or 4, characterized in that: The test system further comprises a first valve, wherein the first valve is arranged at a position of the downstream pipeline on the upstream side of the adjustable orifice plate; and / or The test system further comprises a second valve, which is arranged on the connecting pipeline.

8. The test system according to claim 3 or 4, characterized in that: The test system further comprises a discharge tank, the outlet of the connecting pipe is connected to the discharge tank, and the discharge tank is used to store the working fluid discharged from the connecting pipe.

9. The test system according to any one of claims 1 to 4, characterized in that: The low-pressure test tank is provided with a window which can be opened or closed; The height positions of the window and the siphon breaking device in the low-pressure test tank are adapted to each other.

10. The test system according to any one of claims 1 to 4, characterized in that: The test system further comprises a hot water boiler subsystem for regulating the temperature in the low-pressure test tank, the low-pressure test tank is provided with a first inlet, and the first inlet is connected to the hot water boiler subsystem; and / or The test system further comprises a pressure regulating subsystem for regulating the pressure in the low-pressure test tank. The low-pressure test tank is provided with a second inlet, and the second inlet is connected to the pressure regulating subsystem.

11. A test method for verifying the reverse discharge capability of a siphon breaking device under low pressure, characterized in that: A test system for verifying the reverse spraying capability of a siphon breaking device under low pressure as described in any one of claims 1 to 10; The test method includes: Inject the working fluid into the low-pressure test tank; Adjusting the temperature and pressure in the low-pressure test tank to a preset test temperature and a preset test pressure, respectively; After the pressure, liquid level and temperature of the working fluid in the low-pressure test tank are stabilized, the working fluid in the low-pressure test tank is controlled to be discharged from the siphon destruction device through the discharge pipe to the outside of the low-pressure test tank under the pressure difference generated by the breach simulation structure; The test data of the siphon breaking device is obtained, and then the reverse spraying capability of the siphon breaking device under low pressure is obtained.

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