Hydraulic dynamometer circulating cooling water system, control method and aeroengine test stand

Abstract

The present invention discloses a hydraulic dynamometer circulating cooling water system, a control method, and an aircraft engine test bench. The system includes a water tower, a hot water tank, a cold water tank, a cooling tower assembly, a first water pump assembly, a second water pump assembly, and a control device. The water tower is connected to the water inlet of the hydraulic dynamometer, and the hot water tank is connected to the water outlet of the hydraulic dynamometer. The hot water tank is connected to the water inlet of the cooling tower assembly via the first water pump assembly. The water outlet of the cooling tower assembly is connected to the cold water tank. The hot water tank and the cold water tank are connected, and the cold water tank is connected to the water tower via the second water pump assembly. The water tower is positioned higher than the hydraulic dynamometer, and the hydraulic dynamometer is positioned higher than the hot water tank and the cold water tank. A first liquid level sensor is provided in the water tower; a first control valve, a first pressure sensor, and a first temperature sensor are provided on a first pipeline; and a second temperature sensor and a second liquid level sensor are provided in the hot water tank. The present invention can meet the requirement of controlling the pulsation of the water supply pressure of the hydraulic dynamometer within ±0.01 MPa.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial circulating cooling water, and in particular relates to a circulating cooling water system for a hydraulic dynamometer of an aero-engine test bench and a control method thereof. Background Art

[0002] The hydraulic dynamometer circulating cooling water system is a crucial component of aircraft engine test benches. It provides cooling water that meets the required parameters for the hydraulic dynamometers in the test benches. Engine test facilities often require hydraulic dynamometer testing of multiple engine models, each with varying cooling water parameter requirements. For example, when providing cooling water to a hydraulic dynamometer, the cooling water pressure must not fluctuate significantly. Furthermore, multiple test bench hydraulic dynamometers may be operated simultaneously and sequentially. Conventional hydraulic dynamometer circulating cooling water systems utilize variable-frequency water supply pumps and pressure-stabilizing tanks to maintain a certain level of cooling water pressure stability. However, when supplying cooling water to one hydraulic dynamometer, the system cannot guarantee the same cooling water pressure stability for another (as described in patent publication CN103808100B). To achieve good test stability, stable water supply pressure is a crucial requirement for hydraulic dynamometers.

[0003] Therefore, it is necessary to design a circulating cooling water system with stable and reliable water pressure that can simultaneously meet the needs of multiple test bench hydraulic dynamometers, so as to meet the various needs of engine test bench tests. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic dynamometer circulating cooling water system, a control method and an aircraft engine test bench to solve the problem that the existing technology cannot meet the problem of stable and reliable water pressure when multiple hydraulic dynamometers of the aircraft engine test bench are turned on successively and tested simultaneously.

[0005] The present invention solves the above technical problems through the following technical solutions: a hydraulic dynamometer circulating cooling water system, comprising a water tower, a hot water tank, a cold water tank, a cooling tower group, a first water pump group, a second water pump group, and a control device; the water tower is connected to the water inlet ends of different hydraulic dynamometers through a first pipeline, the hot water tank is connected to the water outlet ends of different hydraulic dynamometers through a second pipeline, the number of the first pipeline and the second pipeline is the same as the number of hydraulic dynamometers, and each hydraulic dynamometer corresponds to a first pipeline and a second pipeline; the hot water tank The first water pump group is further connected to the water inlet of the cooling tower group, the first water pump group includes at least two water pumps, the cooling tower group includes at least two cooling towers, and each water pump corresponds to one cooling tower; the water outlet of the cooling tower group is connected to the cold water pool; the hot water pool is in communication with the cold water pool, and the cold water pool is connected to the water tower via the second water pump group, the second water pump group includes at least two parallel water pumps; the water tower is located higher than the hydraulic dynamometer, and the hydraulic dynamometer is located higher than the hot and cold water pools;

[0006] A first liquid level sensor is provided in the water tower; a first control valve, a first pressure sensor, and a first temperature sensor are provided on the first pipeline; a second temperature sensor and a second liquid level sensor are provided in the hot water tank; the cooling tower group, the first water pump group, the second water pump group, the first liquid level sensor, the first control valve, the first pressure sensor, the first temperature sensor, the second temperature sensor, and the second liquid level sensor are electrically connected to the control device respectively;

[0007] The control device controls the start and start quantity of the first water pump group and the cooling tower group according to the water temperature and liquid level in the hot water pool, and controls the start and start quantity of the second water pump group according to the liquid level in the water tower.

[0008] Furthermore, the hot water pool is connected to the cold water pool through an overflow hole, and the overflow hole is located at the upper ends of the hot water pool and the cold water pool.

[0009] Furthermore, a second control valve, a second pressure sensor and a check valve are provided on the pipeline between the first water pump group and the cooling tower group, and on the pipeline between the second water pump group and the water tower.

[0010] Furthermore, the system also includes an alarm device electrically connected to the control device, and a third temperature sensor and a third liquid level sensor electrically connected to the control device are provided in the cold water pool.

[0011] Furthermore, the control device includes a host computer, a central control cabinet, a hot water control cabinet, a cold water control cabinet and a cooling tower control cabinet; the cooling tower group is electrically connected to the cooling tower control cabinet; the first water pump group, the second temperature sensor and the second liquid level sensor are electrically connected to the hot water control cabinet respectively; the second water pump group and the first liquid level sensor are electrically connected to the cold water control cabinet respectively; the hot water control cabinet, the cold water control cabinet and the cooling tower control cabinet are electrically connected to the central control cabinet respectively; the central control cabinet is communicatively connected to the host computer.

[0012] Furthermore, the volume of the water tower is 30% to 50% of the maximum total circulating cooling water volume, and the maximum total circulating cooling water volume is the sum of the circulating cooling water volumes required by each hydraulic dynamometer.

[0013] Based on the same inventive concept, the present invention also provides a control method for the hydraulic dynamometer circulating cooling water system as described above, comprising the following steps:

[0014] Get the water temperature and level in the hot water pool;

[0015] When the water temperature in the hot water pool is lower than a first temperature threshold, or the water temperature in the hot water pool is higher than the first temperature threshold and the liquid level in the hot water pool is lower than a first water level threshold, the first water pump group and the cooling tower group are not started; when the water temperature in the hot water pool is higher than the first temperature threshold and the liquid level in the hot water pool is between the first water level threshold and the second water level threshold, any one water pump in the first water pump group and the corresponding cooling tower are started; when the water temperature in the hot water pool is higher than the first temperature threshold and the liquid level in the hot water pool is higher than the second water level threshold, at least two water pumps in the first water pump group and the corresponding cooling towers are started; wherein, the first water level threshold is less than the second water level threshold;

[0016] When the liquid level in the water tower is lower than the third water level threshold, at least two water pumps in the second water pump group are started; when the liquid level in the water tower is between the third water level threshold and the fourth water level threshold, any one water pump in the second water pump group is started; when the liquid level in the water tower is higher than the fourth water level threshold, the second water pump group is not started; wherein, the third water level threshold is less than the fourth water level threshold.

[0017] Furthermore, the first temperature threshold is lower than the maximum water inlet temperature required by the hydraulic dynamometer; preferably, the first temperature threshold is equal to the maximum water inlet temperature required by the hydraulic dynamometer -5°C.

[0018] Furthermore, the control method further includes:

[0019] Obtain the water temperature and liquid level in the cold water pool; when the water temperature in the cold water pool is higher than the second temperature threshold, and / or the liquid level in the cold water pool is lower than the fifth water level threshold, or the liquid level in the cold water pool is higher than the sixth water level threshold, issue an alarm; wherein the fifth water level threshold is less than the sixth water level threshold.

[0020] Based on the same inventive concept, the present invention also provides an aircraft engine test bench, which includes the hydraulic dynamometer circulating cooling water system as described above.

[0021] Beneficial effects

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] The present invention provides a hydraulic dynamometer circulating cooling water system, control method, and aircraft engine test bench. Because a water tower supplies cooling water to each hydraulic dynamometer through an independent pipeline, the cooling water supply pressure of each hydraulic dynamometer is solely related to the elevation difference between the water tower liquid level and the corresponding hydraulic dynamometer, and is unaffected by flow rate changes caused by the activation of other hydraulic dynamometers or the hydraulic dynamometer's own adjustments. Furthermore, by rationally designing the water tower volume, when multiple hydraulic dynamometers are sequentially activated and operated simultaneously, changes in the water tower liquid level can be controlled within a 1-meter range, meeting the requirement for controlling the hydraulic dynamometer water supply pressure pulsation within ±0.01 MPa.

[0024] The water tower supplies cooling water to different hydraulic dynamometers by gravity, which not only meets the low pressure fluctuation requirements when multiple hydraulic dynamometers are started up and run simultaneously, but also has a simple system structure, reliable operation and easy operation.

[0025] When the water temperature in the hot water pool is lower than the first temperature threshold, the first water pump group and the cooling tower group are not started, which saves electricity consumption and reduces the number of starts and stops of the first water pump group, thereby extending the service life of the first water pump group to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a structural schematic diagram of a hydraulic dynamometer circulating cooling water system in an embodiment of the present invention.

[0028] Among them, 1-water tower, 11-first liquid level sensor, 2-hydraulic dynamometer, 3-first pipeline, 31-first control valve, 32-first pressure sensor, 33-first temperature sensor, 4-second pipeline, 5-hot water tank, 51-second temperature sensor, 52-second liquid level sensor, 53-overflow hole, 6-cold water tank, 61-third liquid level sensor, 62-third temperature sensor, 7-cooling tower group, 8-first water pump group, 9-second water pump group, 10-control device. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0030] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0031] like Figure 1 As shown, an embodiment of the present invention provides a hydraulic dynamometer circulating cooling water system, including a water tower 1, a hot water tank 5, a cold water tank 6, a cooling tower group 7, a first water pump group 8, a second water pump group 9 and a control device 10; the water tower 1 is connected to the water inlet of the hydraulic dynamometer 2 through a first pipeline 3, and the hot water tank 5 is connected to the water outlet of the hydraulic dynamometer 2 through a second pipeline 4; the hot water tank 5 is also connected to the water inlet of the cooling tower group 7 through the first water pump group 8; the water outlet of the cooling tower group 7 is connected to the cold water tank 6; the hot water tank 5 is in communication with the cold water tank 6, and the cold water tank 6 is connected to the water tower 1 through the second water pump group 9; the water tower 1 is located higher than the hydraulic dynamometer 2, and the hydraulic dynamometer 2 is located higher than the hot water tank 5 and the cold water tank 6. A first liquid level sensor 11 is provided in the water tower 1; a first control valve 31, a first pressure sensor 32 and a first temperature sensor 33 are provided on the first pipeline 3; a second temperature sensor 51 and a second liquid level sensor 52 are provided in the hot water pool 5; the cooling tower group 7, the first water pump group 8, the second water pump group 9, the first liquid level sensor 11, the first control valve 31, the first pressure sensor 32, the first temperature sensor 33, the second temperature sensor 51 and the second liquid level sensor 52 are electrically connected to the control device 10 respectively.

[0032] like Figure 1 As shown, there are multiple first pipelines 3 and second pipelines 4, and the number of first pipelines 3 and second pipelines 4 is the same as the number of hydraulic dynamometers 2. Each hydraulic dynamometer 2 corresponds to a first pipeline 3 and a second pipeline 4. The water tower 1 supplies cooling water to different hydraulic dynamometers 2 by gravity supply through the independent first pipelines 3, avoiding the influence of flow changes of the current hydraulic dynamometer 2 caused by the activation of other hydraulic dynamometers 2 or the self-adjustment of the current hydraulic dynamometer 2. The current hydraulic dynamometer 2 refers to the hydraulic dynamometer 2 that is activated first.

[0033] The first water pump group 8 includes at least two water pumps, and the cooling tower group 7 includes at least two cooling towers, with each water pump corresponding to a cooling tower. For example, the first water pump group 8 includes a first water pump and a second water pump, and the cooling tower group 7 includes a first cooling tower and a second cooling tower. The hot water pool 5 is connected to the first cooling tower via the first water pump, and the hot water pool 5 is also connected to the second cooling tower via the second water pump. When multiple hydraulic dynamometers 2 are started or operated simultaneously, the water consumption of each hydraulic dynamometer 2 varies, making it difficult to individually match the hydraulic dynamometers 2 with the water pumps in the first water pump group 8, which is neither reasonable nor economical. Therefore, the present invention controls the number of water pumps in the first water pump group 8 and the number of cooling towers in the cooling tower group 7 that are started and stopped based on the water temperature and liquid level in the hot water pool 5. This not only ensures the stability and reliability of water pressure when multiple hydraulic dynamometers 2 are started or operated simultaneously, but also reduces equipment costs and saves electricity. The second water pump group 9 includes at least two parallel water pumps. Exemplarily, the second water pump group 9 includes a third water pump and a fourth water pump. One end of the third water pump and the fourth water pump are respectively connected to the cooling pool, and the other end is respectively connected to the water tower 1.

[0034] In a specific embodiment of the present invention, the hot water pool 5 is connected to the cold water pool 6 through the overflow hole 53. When the first water pump group 8 and the cooling tower group 7 are not started, the circulating cooling water in the hot water pool 5 flows directly into the cold water pool 6 through the overflow hole 53, and then flows back to the water tower 1 to circulate and cool the multiple hydraulic dynamometers 2.

[0035] In a specific embodiment of the present invention, a second control valve, a second pressure sensor, and a check valve are sequentially provided on the pipeline between the first water pump and the first cooling tower, the pipeline between the second water pump and the second cooling tower, the pipeline between the third water pump and the water tower 1, and the pipeline between the fourth water pump and the water tower 1. When the water pumps and cooling towers are turned on, the corresponding second control valves are opened. For example, when the first water pump and the first cooling tower are started, the second control valve on the pipeline between the first water pump and the first cooling tower is opened; when the third water pump is started, the second control valve on the pipeline between the third water pump and the water tower 1 is opened.

[0036] In a specific embodiment of the present invention, the system further includes an alarm device electrically connected to the control device 10, and a third temperature sensor 62 and a third liquid level sensor 61 electrically connected to the control device 10 are provided in the cold water pool 6; the third temperature sensor 62 detects the water temperature in the cold water pool 6, and the third liquid level sensor 61 detects the liquid level in the cold water pool 6. When the water temperature in the cold water pool 6 is higher than the second temperature threshold, the alarm device is controlled to sound an alarm; when the water temperature in the cold water pool 6 is higher than the second temperature threshold and the liquid level in the cold water pool 6 is lower than the fifth water level threshold, the alarm device is controlled to sound an alarm; when the water temperature in the cold water pool 6 is higher than the second temperature threshold and the liquid level in the cold water pool 6 is higher than the sixth water level threshold, the alarm device is controlled to sound an alarm; when the liquid level in the cold water pool 6 is lower than the fifth water level threshold or the liquid level in the cold water pool 6 is higher than the sixth water level threshold, the alarm device is controlled to sound an alarm; wherein the fifth water level threshold is less than the sixth water level threshold.

[0037] In a specific embodiment of the present invention, the control device 10 includes a host computer, a central control cabinet, a hot water control cabinet, a cold water control cabinet and a cooling tower control cabinet; the first cooling tower and the second cooling tower are electrically connected to the cooling tower control cabinet respectively; the first water pump group 8, the second temperature sensor 51 and the second liquid level sensor 52 are electrically connected to the hot water control cabinet respectively; the second water pump group 9, the first liquid level sensor 11, the alarm device, the third temperature sensor 62 and the third liquid level sensor 61 are electrically connected to the cold water control cabinet respectively; the hot water control cabinet, the cold water control cabinet and the cooling tower control cabinet are electrically connected to the central control cabinet respectively; the central control cabinet is connected to the host computer through a network.

[0038] In one embodiment of the present invention, the volume of water tower 1 is 30% to 50% of the maximum total circulating cooling water volume. The maximum total circulating cooling water volume is the sum of the circulating cooling water volume required by each hydraulic dynamometer 2. The manufacturer specifies the required circulating cooling water volume for each hydraulic dynamometer 2 upon shipment. This volume design of water tower 1 ensures minimal water level fluctuation within water tower 1 at maximum system load, maintaining a controllable height of approximately 1 meter. This maintains the requirement for water supply pressure pulsation within ±0.01 MPa for hydraulic dynamometer 2. For a given volume, water tower 1 is optimized to maximize its pool area and minimize its depth.

[0039] An embodiment of the present invention further provides a control method for the hydraulic dynamometer circulating cooling water system as described above, comprising the following steps:

[0040] 1. When a hydraulic dynamometer test is required on the hydraulic dynamometer 2, the corresponding first control valve 31 is controlled to open, and the cooling water (or other cooling medium) in the water tower 1 flows into the water inlet of the hydraulic dynamometer 2 through the first pipeline 3 under the action of gravity. At the same time, the first pressure sensor 32 and the first temperature sensor 33 detect the pressure and temperature at the water inlet of the hydraulic dynamometer 2 and transmit them to the control device 10 for display, so as to observe and understand the system operation status in real time.

[0041] 2. Under the action of gravity, the cooling water undergoes a hydraulic dynamometer test and heat exchange in the hydraulic dynamometer 2 and then flows from its outlet through the second pipe 4 into the hot water tank 5. The second temperature sensor 51 detects the water temperature in the hot water tank 5, and the second liquid level sensor 52 detects the liquid level in the hot water tank 5. When the water temperature in the hot water pool 5 is lower than the first temperature threshold, the water temperature in the hot water pool 5 is still lower than the maximum inlet water temperature required by the hydraulic dynamometer 2, indicating that there is no need to return water to the cooling tower for cooling and the circulating cooling water in the hot water pool 5 flows directly into the cold water pool 6 through the overflow hole 53 (when the liquid level in the hot water pool 5 is lower than the first water level threshold, it indicates that the hydraulic dynamometer 2 has stopped using water or the water supply of the first water pump 8 is greater than the return water volume of the hydraulic dynamometer 2, causing the water level of the hot water pool 5 to drop close to the bottom of the pool and no water return is needed, so the first water pump group 8 and the cooling tower group 7 are not started); when the water temperature in the hot water pool 5 is higher than the first temperature threshold and the liquid level in the hot water pool 5 is lower than the first water level threshold, it indicates that the hydraulic dynamometer 2 has stopped using water or the water supply of the first water pump 8 is greater than the return water volume of the hydraulic dynamometer 2 The amount of water causes the water level of the hot water pool 5 to drop close to the bottom of the pool, and backflow is not required, so the first water pump group 8 and the cooling tower group 7 are not started. When the water temperature in the hot water pool 5 is higher than the first temperature threshold and the liquid level in the hot water pool 5 is between the first water level threshold and the second water level threshold, it indicates that the number of hydraulic dynamometers 2 turned on is small or the number of hydraulic dynamometers 2 using water is small. Therefore, only one group of water pumps and cooling towers can meet the demand, that is, the first water pump and the first cooling tower are started, or the second water pump and the second cooling tower are started. When the water temperature in the hot water pool 5 is higher than the first temperature threshold and the liquid level in the hot water pool 5 is higher than the second water level threshold, it indicates that the number of hydraulic dynamometers 2 using water is large or the system is running at full load. Therefore, all water pumps and cooling towers are started, that is, the first water pump, the second water pump, the first cooling tower, and the second cooling tower are started. The number of water pumps and cooling towers in the first water pump group 8 that are started and stopped is controlled according to the water temperature and liquid level in the hot water pool 5, which not only meets the water demand during the test, but also saves electricity consumption and extends the service life of the water pumps.

[0042] In this embodiment, the first water level threshold (low water level threshold) is less than the second water level threshold (high water level threshold); the first temperature threshold is less than the maximum water inlet temperature required by the hydraulic dynamometer 2. Preferably, the first temperature threshold is equal to the maximum water inlet temperature required by the hydraulic dynamometer 2 -5°C.

[0043] 3. The water cooled by the cooling tower flows into the cold water pool 6 or the hot water pool 5, and then flows directly into the cooling pool through the overflow hole 53. The first liquid level sensor 11 detects the liquid level in the water tower 1. When the liquid level in the water tower 1 is lower than the third water level threshold, it indicates that the water level in the water tower 1 is low, and the third water pump and the fourth water pump must be started to meet the water demand. When the liquid level in the water tower 1 is between the third water level threshold and the fourth water level threshold, it indicates that the water level in the water tower 1 is at a medium level, and the third water pump or the fourth water pump must be started to meet the water demand. When the liquid level in the water tower 1 is higher than the fourth water level threshold, it indicates that the water tower 1 is about to overflow, and the third water pump and the fourth water pump must not be started. By starting the third water pump and / or the fourth water pump, the circulating cooling water is lifted and returned to the water tower 1, forming a cycle.

[0044] The third water level threshold (low water level threshold) is less than the fourth water level threshold (high water level threshold). Data collected by all sensors can be displayed on the control device 10 to facilitate real-time monitoring of the test process. When a thermometer is used as the temperature sensor or a manometer is used as the pressure sensor, no electrical connection to the control device 10 is required.

[0045] Traditional circulating cooling water systems use booster pumps to pressurize the supply of circulating cooling water to the equipment. For situations where multiple devices require circulating cooling water and the amount of circulating cooling water varies under different operating conditions, variable frequency constant pressure water supply equipment is generally sufficient. This is because the equipment does not require high pressure fluctuations in the circulating cooling water supply, only the minimum supply pressure is required. However, the circulating cooling water for hydraulic dynamometers requires the supply pressure pulsation to be controlled within ±0.01 MPa, or even higher pressure fluctuations. When another hydraulic dynamometer is turned on during a test, the water flow rate of the entire system increases and the pressure decreases. The variable frequency controller needs to gradually maintain constant pressure by increasing the number of booster pumps turned on or the power of the variable frequency pump. However, the pressure fluctuations that exceed the range during this process will cause the first hydraulic dynamometer to alarm, resulting in test failure. Without considering the economy and the floor space of the pump room, a high-precision variable frequency constant pressure water supply device (pressure fluctuation is controlled within 0.01Mpa) can be set up for each hydraulic dynamometer to eliminate the influence of the subsequently opened hydraulic dynamometer on the circulating cooling water supply pressure fluctuation of the running hydraulic dynamometer. However, in the hydraulic dynamometer test, it is necessary to test the test data by adjusting the water supply flow at the water inlet end of the hydraulic dynamometer and maintaining the water supply pressure stable. Although the flow adjustment range will be relatively gentle, the resulting water supply pressure fluctuation will also have a certain impact on the accuracy of the hydraulic dynamometer test data.

[0046] In the present invention, the water tower supplies cooling water in the water tower to each hydraulic dynamometer through a mutually independent first pipeline in a gravity water supply mode. Therefore, the circulating cooling water inlet pressure of the hydraulic dynamometer is only related to the water tower liquid level and the elevation difference between the hydraulic dynamometers, and the water supply pressure will not be affected by the flow change caused by the opening of other hydraulic dynamometers or the self-regulation of the hydraulic dynamometers. Furthermore, by rationally designing the water tower volume, the liquid level change in the water tower can be controlled within a range of 1m when multiple hydraulic dynamometers are opened and operated simultaneously. Therefore, the requirement of controlling the pulsation of the water supply pressure of the hydraulic dynamometer within ±0.01Mpa can be met, thereby ensuring that the water supply pressure is constant and reliable, further ensuring the accurate measurement of the output shaft power of the aircraft engine, and having promotion value.

[0047] Compared with the existing variable frequency constant pressure water supply equipment, the present invention adopts a water tower gravity water supply method, which can not only meet the low pressure fluctuation requirements of the hydraulic dynamometers of multiple engine test benches being started and operated simultaneously, but also has a simple system, reliable operation and easy operation; when the system is working, when the water temperature in the hot water pool is lower than the first temperature threshold, the first water pump group stops the pump and the cooling tower group is closed, and the circulating cooling water of the hot water pool flows to the cold water pool through the overflow hole, which has the advantage of saving electricity and energy consumption, and at the same time reduces the number of times the first water pump group is started and stopped, and to a certain extent extends the service life of the first water pump group.

[0048] The above disclosure is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, and they should all be covered by the scope of protection of the present invention.

Claims

1. A hydraulic dynamometer circulating cooling water system, characterized by: The system includes a water tower, a hot water pool, a cold water pool, a cooling tower group, a first water pump group, a second water pump group and a control device; the water tower is connected to the water inlet of different hydraulic dynamometers through a first pipeline, and the hot water pool is connected to the water outlet of different hydraulic dynamometers through a second pipeline. The number of the first pipeline and the second pipeline is the same as the number of hydraulic dynamometers, and each hydraulic dynamometer corresponds to a first pipeline and a second pipeline; the hot water pool is also connected to the water inlet of the cooling tower group through the first water pump group. The first water The pump group includes at least two water pumps, and the cooling tower group includes at least two cooling towers, with each water pump corresponding to one cooling tower; the water outlet of the cooling tower group is connected to the cold water pool; the hot water pool is connected to the cold water pool via an overflow hole, the overflow hole is located at the upper end of the hot water pool and the cold water pool, and the cold water pool is connected to the water tower via a second water pump group, and the second water pump group includes at least two parallel water pumps; the water tower is located higher than the hydraulic dynamometer, and the hydraulic dynamometer is located higher than the hot water pool and the cold water pool; A first liquid level sensor is provided in the water tower; a first control valve, a first pressure sensor, and a first temperature sensor are provided on the first pipeline; a second temperature sensor and a second liquid level sensor are provided in the hot water tank; the cooling tower group, the first water pump group, the second water pump group, the first liquid level sensor, the first control valve, the first pressure sensor, the first temperature sensor, the second temperature sensor, and the second liquid level sensor are electrically connected to the control device respectively; The control device controls the start and the number of starts of the first water pump group and the cooling tower group according to the water temperature and liquid level in the hot water pool, and controls the start and the number of starts of the second water pump group according to the liquid level in the water tower; The volume of the water tower is 30% to 50% of the maximum total circulating cooling water volume, and the maximum total circulating cooling water volume is the sum of the circulating cooling water volumes required by each hydraulic dynamometer.

2. The hydraulic dynamometer circulating cooling water system according to claim 1, characterized in that: A second control valve, a second pressure sensor and a check valve are provided on the pipeline between the first water pump group and the cooling tower group, and on the pipeline between the second water pump group and the water tower.

3. The hydraulic dynamometer circulating cooling water system according to claim 1, characterized in that: It also includes an alarm device electrically connected to the control device, and a third temperature sensor and a third liquid level sensor electrically connected to the control device are provided in the cold water pool.

4. The hydraulic dynamometer circulating cooling water system according to claim 1, characterized in that: The control device includes a host computer, a central control cabinet, a hot water control cabinet, a cold water control cabinet and a cooling tower control cabinet; the cooling tower group is electrically connected to the cooling tower control cabinet; the first water pump group, the second temperature sensor and the second liquid level sensor are electrically connected to the hot water control cabinet respectively; the second water pump group and the first liquid level sensor are electrically connected to the cold water control cabinet respectively; the hot water control cabinet, the cold water control cabinet and the cooling tower control cabinet are electrically connected to the central control cabinet respectively; the central control cabinet is communicatively connected to the host computer.

5. A control method for a hydraulic dynamometer circulating cooling water system according to any one of claims 1 to 4, characterized in that: The following steps are involved: Get the water temperature and level in the hot water pool; When the water temperature in the hot water pool is lower than a first temperature threshold, or the water temperature in the hot water pool is higher than the first temperature threshold and the liquid level in the hot water pool is lower than a first water level threshold, the first water pump group and the cooling tower group are not started; when the water temperature in the hot water pool is higher than the first temperature threshold and the liquid level in the hot water pool is between the first water level threshold and the second water level threshold, any one water pump in the first water pump group and the corresponding cooling tower are started; when the water temperature in the hot water pool is higher than the first temperature threshold and the liquid level in the hot water pool is higher than the second water level threshold, at least two water pumps in the first water pump group and the corresponding cooling towers are started; wherein, the first water level threshold is less than the second water level threshold; When the liquid level in the water tower is lower than the third water level threshold, at least two water pumps in the second water pump group are started; when the liquid level in the water tower is between the third water level threshold and the fourth water level threshold, any one water pump in the second water pump group is started; when the liquid level in the water tower is higher than the fourth water level threshold, the second water pump group is not started; wherein, the third water level threshold is less than the fourth water level threshold.

6. The control method of the hydraulic dynamometer circulating cooling water system according to claim 5, characterized in that: The first temperature threshold is lower than the maximum water inlet temperature required by the hydraulic dynamometer.

7. The control method of the hydraulic dynamometer circulating cooling water system according to claim 6, characterized in that: The first temperature threshold is equal to the maximum water inlet temperature required by the hydraulic dynamometer -5°C.

8. The control method for a hydraulic dynamometer circulating cooling water system according to any one of claims 5 to 7, characterized in that: The control method further includes: Obtain the water temperature and liquid level in the cold water pool; when the water temperature in the cold water pool is higher than the second temperature threshold, and / or the liquid level in the cold water pool is lower than the fifth water level threshold, or the liquid level in the cold water pool is higher than the sixth water level threshold, issue an alarm; wherein the fifth water level threshold is less than the sixth water level threshold.

9. An aircraft engine test bench, characterized by: The invention comprises the hydraulic dynamometer circulating cooling water system according to any one of claims 1 to 4.

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