Testing device for cooling fan of nuclear island control rod driving mechanism

Abstract

A test device for a nuclear island control rod drive mechanism cooling fan belongs to the technical field of cooling fan performance test, and comprises a cooling fan motor, the lower end of the cooling fan motor is rotatably connected with an impeller group, the impeller group is provided with a shock absorber in a cross shape around a central shaft, and the lower end of the shock absorber is fixedly connected with a support base. According to the utility model, the influence of external factors on the cooling fan in the testing process can be reduced, and the safety problem caused by kinetic energy accumulation of the cooling fan is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the cooling fan performance test technical field relates to a kind of test device of nuclear island control rod drive mechanism cooling fan. BACKGROUND

[0002] In nuclear power plant, control rod drive mechanism is used to adjust or emergency stop chain reaction in nuclear reactor, and its normal work is crucial to power plant safety.Cooling fan is responsible for providing necessary cooling when drive mechanism operates to prevent overheating leading to equipment failure.According to relevant standards and specifications of nuclear power industry, cooling fan needs to be verified by long-time simulation test for its reliability.Under normal circumstances, cooling fan is required to run continuously for 720 hours (i.e.30 days) to simulate long-term operation under actual working conditions.Such long-time test helps to expose potential design defects or manufacturing quality problems, and can evaluate the performance stability of cooling fan under extreme conditions.

[0003] However, due to long test period, cooling fan may be affected by various external factors during testing, such as change of ambient temperature, dust accumulation, humidity fluctuation, etc., which may interfere with test results.In closed pipeline, long-time high-speed operation of cooling fan may cause accumulation of certain kinetic energy and pressure inside air, which may threaten safety of test device and cause additional impact on cooling fan itself.Therefore, there is an urgent need for a test device of nuclear island control rod drive mechanism cooling fan. SUMMARY

[0004] To achieve the above purpose, the utility model provides a kind of test device of nuclear island control rod drive mechanism cooling fan, reduces the influence of external factors on cooling fan during testing, and avoids safety problems caused by accumulation of kinetic energy of cooling fan.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of a kind of test device of nuclear island control rod drive mechanism cooling fan, comprising cooling fan motor, cooling fan motor lower end is rotationally connected with impeller group, the shock absorber is arranged in cross shape with central shaft in impeller group, and the shock absorber lower end is fixedly connected with support base.

[0006] Further, the outer side of the impeller group is provided with a wind pipe, the upper part of the wind pipe is fixedly connected with one end of the diffusion cylinder, and the other end of the diffusion cylinder is fixedly connected with one end of the closed air valve.

[0007] Further, the other end of the closed air valve is sequentially fixedly connected with the first closed pipeline elbow pipe, the first closed pipeline straight pipe, the second closed pipeline elbow pipe and the second closed pipeline straight pipe.

[0008] Further, the upper part of the support base is open to the right, and a third closed pipeline elbow is arranged in the support base, one end of the third closed pipeline elbow is fixedly connected with the lower end of the impeller group, and the other end of the third closed pipeline elbow is fixedly connected with the electric heater.

[0009] Further, the right end of the electric heater is provided with a static pressure tank, an adjustable air valve is arranged outside the static pressure tank, and the upper end of the static pressure tank is fixedly connected with the second closed pipeline straight pipe.

[0010] Further, the outer sides of the first closed pipeline elbow, the second closed pipeline elbow, the third closed pipeline elbow, the first closed pipeline straight pipe and the second closed pipeline straight pipe are provided with heat insulation layers.

[0011] Further, the upper side of the third closed pipeline elbow is provided with a pipeline internal temperature detector.

[0012] Further, the lower part of the cooling fan motor is provided with a motor driving end vibration sensor, and the upper part of the cooling fan motor is provided with a motor non-driving end vibration sensor.

[0013] Further, the lower part of the cooling fan motor is provided with a motor driving end temperature sensor, and the upper part of the cooling fan motor is provided with a motor non-driving end temperature sensor.

[0014] Further, a motor winding temperature sensor is arranged on the motor winding of the cooling fan motor.

[0015] The beneficial effects of the utility model are:

[0016] (1) the test device of the nuclear island control rod driving mechanism cooling fan of the utility model adopts a closed pipeline, which significantly reduces the influence of dust and humidity brought by air exchange with the outside during the operation of the cooling fan, and the heat insulation layer is arranged outside the closed pipeline, which can maintain the constant temperature of the gas in the pipeline, and provides a more stable and controllable environment for the performance test of the cooling fan.

[0017] (2) the utility model cooperates the electric heater and the adjustable air valve to realize accurate control of the gas temperature in the pipeline, the electric heater directly converts electric energy into heat energy, the heating process is rapid, and the requirement for temperature change in the test process is met; when the gas temperature in the pipeline is too high, part of the cold air outside is allowed to enter the pipeline by controlling the valve opening degree of the adjustable air valve, so that the purpose of cooling is achieved.

[0018] (3) the utility model cooperates the diffusion cylinder, the static pressure tank and the plurality of pipeline elbows, so that the kinetic energy and energy accumulated in the closed pipeline due to the long-time high-speed operation of the cooling fan can be released, thereby ensuring the safety of the whole test device and minimizing the impact on the cooling fan. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings described in the following are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 is a test device structure diagram of a nuclear island control rod drive mechanism cooling fan of the present application.

[0021] Figure 2 is Figure 1 the enlarged view of A in the figure.

[0022] Figure 3 is an enlarged structure schematic diagram of the cooling fan of the present application.

[0023] Figure 4 is an enlarged structure schematic diagram of the cooling fan motor of the present application.

[0024] In the figure, 1, cooling fan motor; 2, impeller group; 3, shock absorber; 4, support base; 5, air duct; 6, diffusion cylinder; 7, closed air valve; 801, first closed pipeline elbow; 802, second closed pipeline elbow; 803, third closed pipeline elbow; 901, first closed pipeline straight pipe; 902, second closed pipeline straight pipe; 10, electric heater; 11, static pressure tank; 12, adjustable air valve; 13, heat preservation and insulation layer; 14, pipeline internal temperature detector; 15, motor driving end vibration sensor; 16, motor non-driving end vibration sensor; 17, motor driving end temperature sensor; 18, motor non-driving end temperature sensor; 19, motor winding temperature sensor. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely in the following by combining with the drawings in the embodiments of the present application, obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0026] As Figures 1-4 shown, the test device of a nuclear island control rod drive mechanism cooling fan provided by the present application, the lower end of the cooling fan motor 1 is rotationally connected with the impeller group 2, the impeller group 2 is provided with the shock absorber 3 in a cross shape with a center shaft, and the lower end of the shock absorber 3 is fixedly connected with the support base 4. The shock absorber 3 is provided with a spring inside, which is used to offset the vibration generated by the cooling fan motor 1 when working.

[0027] The fan wheel group 2 is provided with a wind pipe 5 outside, the upper part of the wind pipe 5 is fixedly connected with one end of a diffusion pipe 6, the diffusion pipe 6 is in the shape of an inverted trapezoid, the other end of the diffusion pipe 6 is fixedly connected with one end of a closed air valve 7, the other end of the closed air valve 7 is fixedly connected with a first closed pipe elbow 801, a first closed pipe straight pipe 901, a second closed pipe elbow 802 and a second closed pipe straight pipe 902 in sequence. The closed air valve 7 is a one-way valve, which prevents backflow of air.

[0028] The cross section of the diffusion pipe 6 gradually increases from bottom to top, which can reduce the impact of air flow, lower the air flow speed and increase the static pressure of the air flow, so that the air flow can smoothly pass through the first closed pipe elbow 801, the first closed pipe straight pipe 901, the second closed pipe elbow 802 and the second closed pipe straight pipe 902, and further reduce the impact by turning the air flow in the process.

[0029] The upper part of the supporting base 4 is open to the right, and the third closed pipe elbow 803 is arranged inside the supporting base 4, one end of the third closed pipe elbow 803 is fixedly connected with the lower end of the fan wheel group 2, and the other end of the third closed pipe elbow 803 is fixedly connected with an electric heater 10. The air flow heated by the electric heater 10 is turned at the third closed pipe elbow 803, so as to avoid direct impact of the air flow on the fan wheel group 2.

[0030] The static pressure tank 11 is arranged at the right end of the electric heater 10, the adjustable air valve 12 is arranged outside the static pressure tank 11, and the upper end of the static pressure tank 11 is fixedly connected with the second closed pipe straight pipe 902. The air flow is converted from dynamic pressure to static pressure at the static pressure tank 11, which can reduce the working load of the cooling fan motor 1; the pipe temperature is adjusted by controlling the electric heater 10 and the adjustable air valve 12, if the temperature in the pipe is higher than the set value, the valve opening of the adjustable air valve 12 is increased to reduce the temperature, and if the temperature in the pipe is lower than the set value, the electric heater 10 is turned on to heat the air flow.

[0031] The first closed pipe elbow 801, the second closed pipe elbow 802, the third closed pipe elbow 803, the first closed pipe straight pipe 901 and the second closed pipe straight pipe 902 are provided with a heat preservation and insulation layer 13 outside. The heat preservation and insulation layer 13 can reduce the temperature change of the air flow in the closed pipe.

[0032] The pipe internal temperature detector 14 is arranged at the upper side of the third closed pipe elbow 803, and the temperature probe at the lower side of the pipe internal temperature detector 14 is located in the middle of the third closed pipe elbow 803. The pipe internal temperature detector 14 is used to detect the temperature of the air flow at the air inlet when the cooling fan motor 1 is running.

[0033] The motor driving end vibration sensor 15 is arranged at the lower part of the cooling fan motor 1, and the motor non-driving end vibration sensor 16 is arranged at the upper part of the cooling fan motor 1, and the motor driving end vibration sensor 15 and the motor non-driving end vibration sensor 16 are used for detecting the vibration value when the cooling fan motor 1 operates.

[0034] The motor driving end temperature sensor 17 is arranged at the lower part of the cooling fan motor 1, and the motor non-driving end temperature sensor 18 is arranged at the upper part of the cooling fan motor 1, and the motor driving end temperature sensor 17 and the motor non-driving end temperature sensor 18 are used for detecting the temperature when the cooling fan motor 1 operates.

[0035] The motor winding temperature sensor 19 is arranged on the motor winding of the cooling fan motor 1, and the motor winding temperature sensor 19 is used for detecting the temperature of the motor winding when the motor winding works.

[0036] The working principle of the test device for the nuclear island control rod driving mechanism cooling fan is that the cooling fan motor 1 is started, the cooling fan motor 1 drives the impeller set 2 to generate airflow, the airflow temperature is detected by the pipeline internal temperature detector 14, the airflow temperature is controlled by the electric heater 10 and the adjustable air valve 12 to reach the temperature set value required by the operation, the airflow reduces kinetic energy through the diffusion cylinder 6, and sequentially passes through the first closed pipeline elbow pipe 801, the first closed pipeline straight pipe 901, the second closed pipeline elbow pipe 802 and the second closed pipeline straight pipe 902 to further reduce the impact capacity, the airflow is converted from dynamic pressure to static pressure at the static pressure box 11, and the backflow is completed through the third closed pipeline elbow pipe 803, in the process, the motor driving end vibration sensor 15 and the motor non-driving end vibration sensor 16 detect the vibration value when the cooling fan motor 1 operates, the motor driving end temperature sensor 17 and the motor non-driving end temperature sensor 18 detect the temperature when the cooling fan motor 1 operates, and the motor winding temperature sensor 19 detects the temperature of the motor winding when the motor winding works, so that the various data of the cooling fan during operation can be detected in real time.

[0037] Each of the embodiments in the specification is described in a related manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0038] The above only describes the preferred embodiments of the utility model, and is not used for limiting the protection scope of the utility model. Any modification, equivalent replacement, improvement and the like made in the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A test device for a nuclear island control rod drive mechanism cooling fan, comprising a cooling fan motor (1), the lower end of the cooling fan motor (1) is rotatably connected with an impeller set (2), characterized in that, The impeller group (2) is provided with a shock absorber (3) in the center axis in a cross shape, and the lower end of the shock absorber (3) is fixedly connected with a support base (4); The outer side of the impeller group (2) is provided with a wind pipe (5), and the upper part of the wind pipe (5) is fixedly connected with one end of a diffusion cylinder (6), and the other end of the diffusion cylinder (6) is fixedly connected with one end of a closed air valve (7); The other end of the closed air valve (7) is sequentially fixedly connected with a first closed pipeline elbow (801), a first closed pipeline straight pipe (901), a second closed pipeline elbow (802), and a second closed pipeline straight pipe (902); The upper part and the right part of the support base (4) are open, and the inside of the support base (4) is provided with a third closed pipeline elbow (803), one end of which is fixedly connected with the lower end of the impeller group (2), and the other end of which is fixedly connected with an electric heater (10); The right end of the electric heater (10) is provided with a static pressure tank (11), the outer side of the static pressure tank (11) is provided with an adjustable air valve (12), and the upper end of the static pressure tank (11) is fixedly connected with the second closed pipeline straight pipe (902).

2. The test device of the nuclear island control rod drive mechanism cooling fan according to claim 1, characterized in that, The outer sides of the first closed pipeline elbow (801), the second closed pipeline elbow (802), the third closed pipeline elbow (803), the first closed pipeline straight pipe (901), and the second closed pipeline straight pipe (902) are provided with a heat preservation and insulation layer (13).

3. The test device of the nuclear island control rod drive mechanism cooling fan according to claim 1, characterized in that, The upper side of the third closed pipeline elbow (803) is provided with a pipeline internal temperature detector (14).

4. The test device of the nuclear island control rod drive mechanism cooling fan according to claim 1, characterized by, The lower part of the cooling fan motor (1) is provided with a motor driving end vibration sensor (15), and the upper part of the cooling fan motor (1) is provided with a motor non-driving end vibration sensor (16).

5. The test device of the nuclear island control rod drive mechanism cooling fan according to claim 1, characterized in that, The lower part of the cooling fan motor (1) is provided with a motor driving end temperature sensor (17), and the upper part of the cooling fan motor (1) is provided with a motor non-driving end temperature sensor (18).

6. The test device of the nuclear island control rod drive mechanism cooling fan according to claim 1, characterized by, The motor winding temperature sensor (19) is arranged on the motor winding of the cooling fan motor (1).

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