Multi-station high-flow engine water supply system and water supply method

Abstract

The invention provides a multi-station high-flow engine water supply system and a water supply method, and relates to the technical field of engine tests. According to the multi-station high-flow engine water supply system, cooling water can be supplied to a plurality of engine stations, and the cooling water in the second cooling water flow path is cooled by arranging the water cooling unit and the heat exchanger; cooling water in the second cooling water flow path and cooling water in the first cooling water flow path are mixed according to the required proportion and then supplied to the engine for cooling, the temperature of the cooling water supplied to the engine is more accurate, and it is guaranteed that the water cooling unit meets the water supply requirement of the multi-station large-flow engine; therefore, the problem that the cooling requirement of the multi-station large-flow engine in the high-temperature and high-humidity weather in summer is difficult to meet due to the fact that an evaporative air cooling tower is adopted for circulating water cooling is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine testing, and in particular to a water supply system and a water supply method for multiple engines with large flow rates. Background Art

[0002] In order to ensure that the ship has a wide range of engine power and a wide range of compatible models available during the design phase, companies that develop and produce marine diesel engines need to build multiple test benches to meet the development, production, and testing needs of high-power marine engines. During the operation of high-power marine engines, in order to ensure the normal heat exchange of engine components (such as air coolers, fresh water heat exchangers, etc.) and the power absorption of hydraulic dynamometers, a large flow of cooling water needs to be provided externally, and the water pressure and supply water temperature need to be within a suitable range. Especially when multiple test benches are running at the same time, the total supply of the entire circulating cooling water system is calculated in thousands of cubic meters per hour.

[0003] The factory usually adopts a unified design scheme of external circulating cooling water, that is, a centralized circulating cooling water system is set up to supply cooling water to each test bench through a water pump. After participating in the heat exchange and temperature rise of each bench, the cooling water is converged and returned to the collection pool. After the water temperature is lowered by the cooling system, it is supplied to each test bench again by a water pump, so as to realize the recycling of cooling water. This scheme is a relatively mature and economical water supply method. Although the cooling system for cooling the circulating water is generally divided into two technical paths: evaporative cooling tower and chiller, due to the high energy consumption cost of the chiller, the unit itself will also generate heat, so the chiller is often used in small engine (less than 1000kW) tests, and for high-power engines, especially for cooling water cooling of multiple engine benches, evaporative air-cooled cooling towers are generally used. This technical scheme is mature, but it has the disadvantage of being greatly affected by the temperature and humidity of the atmospheric environment. Especially in the hot and humid weather in summer, the evaporation capacity of the cooling tower decreases, and the temperature drop of the cooling water is limited, resulting in the gradual increase of the water temperature in the circulating cooling water system, which cannot meet the test requirements of the engine. Therefore, how to supply cooling water to multiple engines under high temperature and high humidity conditions in summer has become a technical problem that urgently needs to be solved in this field. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-station large-flow engine water supply system and water supply method, which can improve the problem in the prior art that it is difficult to effectively supply cooling water to multiple engines under high temperature and high humidity conditions in summer.

[0005] The embodiments of the present invention can be implemented in the following ways:

[0006] A water supply system for multiple engines with large flow rates, wherein the multiple engines with large flow rates are used to supply cooling water to multiple engine positions; the water supply system for multiple engines with large flow rates comprises:

[0007] A cooling water flow path, the cooling water flow path having a cooling water inlet, a first cooling water flow path, a second cooling water flow path and a plurality of flow distribution valves, the first cooling water flow path and the second cooling water flow path are both connected to the cooling water inlet; a plurality of first water supply pipes distributed along a flow direction are provided on the first cooling water flow path, and the plurality of first water supply pipes are respectively connected to the plurality of flow distribution valves in a one-to-one correspondence; a heat exchanger is provided on the second cooling water flow path, a plurality of second water supply pipes distributed along a flow direction are provided on a portion of the second cooling water flow path located downstream of the heat exchanger, and the plurality of second water supply pipes are respectively connected to the plurality of flow distribution valves in a one-to-one correspondence; the flow distribution valve is used to be connected to an engine, and is used to mix the cooling water in the first water supply pipe and the cooling water in the second water supply pipe according to a preset ratio, and supply the mixed cooling water to the engine; and

[0008] A water-cooling flow path includes a water chiller, the water chiller is connected to the heat exchanger to provide cold water to the heat exchanger, and cools the cooling water in the second cooling water flow path through the heat exchanger.

[0009] Optionally, the water-cooling flow path further includes a first pipeline, a low-temperature water flow distribution valve and a second pipeline; the low-temperature water flow distribution valve is installed at the cold water outlet of the chiller; one end of the first pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the heat exchanger to supply cold water from the chiller to the heat exchanger; one end of the second pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the second cooling water flow path, and the connection point is located downstream of the heat exchanger and upstream of the second water supply pipe closest to the heat exchanger;

[0010] The low-temperature water flow distribution valve is used to control the flow of the first pipeline and the second pipeline.

[0011] Optionally, the water-cooling circuit also includes a first water source pipeline, a cooling supply pipeline, a low-temperature cold water tank and a first return water pipeline, the first water source pipeline is connected to the low-temperature cold water tank to supply water to the low-temperature cold water tank; the two ends of the cooling supply pipeline are respectively connected to the low-temperature cold water tank and the chiller to supply water to the chiller; the two ends of the first return water pipeline are respectively connected to the heat exchanger and the first water source pipeline to realize cold water circulation.

[0012] Optionally, the water-cooling flow path further includes an automatic ice drop machine, which is disposed on the upper side of the low-temperature cold water tank and is used to drop ice into the low-temperature cold water tank to reduce the temperature of cold water in the low-temperature cold water tank.

[0013] Optionally, a cold water temperature sensor is provided on the cooling pipeline, and the cold water temperature sensor is used to detect the temperature of cold water supplied to the chiller.

[0014] Optionally, the volume V of the low-temperature cold water tank is determined by the following formula:

[0015] V=V 机 +V 补 +V 水质管理

[0016] Vmachine=q 泵 *t / (ρ 水 ·c 水1 ΔT 1 )

[0017] V 水质管理 =5%(V 机 +V 补 )

[0018] Among them, V 补 is the volume required for ice throwing; q 泵 is the water circulation flow rate at the cold end of the chiller; t is the minimum operating time of the chiller; ρ 水 is the density of cold water; c 水1 is the specific heat capacity of cold water; ΔT 1 It is the preset temperature fluctuation range.

[0019] Optionally, the multi-station high-flow engine water supply system further includes a third water supply pipe, both ends of which are respectively connected to the first cooling water channel and the chiller, so as to introduce the cooling water in the first cooling water flow path into the chiller through the third water supply pipe and cool the chiller;

[0020] The multi-unit high-flow engine water supply system also includes a second return water pipeline and a third return water pipeline. The second return water pipeline is used to return the cooling water after cooling the multiple engines to the collection tank; the two ends of the third return water pipeline are respectively connected to the chiller and the second return water pipeline to introduce the cooling water after cooling the chiller into the second return water pipeline.

[0021] Optionally, the heat transfer capacity Q of the heat exchanger is determined by the following formula:

[0022] Q>Q 换

[0023] Q换 =c 水2 m 水 ΔT 2

[0024] ΔT 2 =T 冷 -T 柴

[0025] Among them, c 水2 is the specific heat capacity of cooling water; m 水 T is the cooling water mass per unit time calculated based on the maximum cooling water flow required by the most powerful engine among multiple engines; 冷 is the natural water supply temperature; T 柴 The required cooling water temperature for the most powerful engine among multiple engines.

[0026] A method for supplying water to multiple engines with large flow rates, the method being implemented according to the above-mentioned water supply system for multiple engines with large flow rates; the method comprising:

[0027] Obtaining a target station position; wherein the target station position is the station position where the engine requiring cooling is located;

[0028] Controlling the action of the flow distribution valve corresponding to the target station position;

[0029] The water outlet parameters of the flow distribution valve corresponding to the target station position are obtained, and the valve position of the flow distribution valve is controlled according to the water outlet parameters; wherein the water outlet parameters include the water outlet temperature.

[0030] Optionally, the water cooling circuit includes a first pipeline, a low-temperature water flow distribution valve and a second pipeline; the low-temperature water flow distribution valve is installed at the outlet of the chiller; one end of the first pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the heat exchanger to supply cold water from the chiller to the heat exchanger; one end of the second pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the second cooling water flow circuit, and the connection point is located downstream of the heat exchanger and upstream of the second water supply pipe closest to the heat exchanger; the water supply method for multiple large-flow engines also includes:

[0031] The valve position of the low-temperature water flow distribution valve is controlled according to the water outlet parameters to directly mix part of the cold water from the chiller into the second cooling water flow path.

[0032] Optionally, the water cooling circuit further includes a low-temperature cold water tank and an automatic ice drop machine, the low-temperature cold water tank is used to supply cold water to the chiller, and the automatic ice drop machine is arranged on the upper side of the low-temperature cold water tank; the water supply method for multiple high-flow engines also includes:

[0033] The automatic ice drop machine is controlled to drop ice into the low-temperature cold water tank according to the water output parameters to reduce the cold water temperature.

[0034] The beneficial effects of the multi-station high-flow engine water supply system and water supply method provided by the embodiments of the present invention include:

[0035] An embodiment of the present invention provides a multi-station large-flow engine water supply system, which is used to supply cooling water to multiple engine stations. The multi-station large-flow engine water supply system includes a cooling water flow path and a water cooling flow path, the cooling water flow path has a cooling water inlet, a first cooling water flow path, a second cooling water flow path and a plurality of flow distribution valves, the first cooling water flow path and the second cooling water flow path are both connected to the cooling water inlet, so that part of the cooling water flowing from the cooling water inlet enters the first cooling water flow path, and the other part enters the second cooling water flow path. A plurality of first water supply pipes are distributed along the flow direction of the first cooling water flow path, a heat exchanger is provided on the second cooling flow path, and a plurality of second water supply pipes are distributed along the flow direction downstream of the heat exchanger in the second cooling water flow path, and the plurality of first water supply pipes and the plurality of second water supply pipes are respectively connected to the corresponding plurality of flow distribution valves, so that the cooling water in the first water supply pipe and the second water supply pipe can be mixed according to the required proportion through each flow distribution valve, and the mixed cooling water tank engine is supplied. The water cooling circuit includes a water cooling unit, which is connected to a heat exchanger to provide cold water to the heat exchanger, so that the heat exchanger uses the cold water to cool the cooling water in the second cooling water circuit. The water supply system for multiple large-flow engines cools the cooling water in the second cooling water circuit by setting a water cooling unit and a heat exchanger, and mixes the cooling water in the second cooling water circuit with the cooling water in the first cooling water circuit according to the demand ratio and supplies it to the engine for cooling. The temperature of the cooling water supplied to the engine is more accurate, which helps to ensure that the water cooling unit can meet the water supply needs of multiple large-flow engines, and avoids the problem of difficulty in meeting the cooling needs of multiple large-flow engines in high temperature and high humidity weather in summer due to the use of evaporative air-cooled cooling towers for circulating water cooling.

[0036] An embodiment of the present invention also provides a method for supplying water to multiple large-flow engines. The method for supplying water to multiple large-flow engines is implemented based on the above-mentioned water supply system for multiple large-flow engines. Therefore, it also has the technical effect of being able to avoid the problem of difficulty in meeting the cooling needs of multiple large-flow engines in high temperature and high humidity weather in summer due to the use of an evaporative air-cooled cooling tower for circulating water cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0038] Figure 1 It shows a schematic structural diagram of a water supply system for multiple engines with large flow rates provided according to one aspect of the present invention;

[0039] Figure 2 It shows a schematic structural diagram of the flow distribution valve supplying water to the engine in a water supply system of multiple engines with large flow rates according to one aspect of the present invention;

[0040] Figure 3 A schematic structural diagram of a water cooling flow path in a water supply system for multiple engines with large flow rates provided according to one aspect of the present invention is shown.

[0041] Reference numerals:

[0042] 10-Multi-position high-flow engine water supply system; 100-Cooling water flow path; 111-Cooling water inlet; 112-First cooling water flow path; 113-First water supply pipe; 114-Second cooling water flow path; 115-Second water supply pipe; 120-Flow distribution valve; 121-First inlet; 122-Second inlet; 123-Cooling water outlet; 131-Water inlet pipe; 132-Flow meter; 133-Outlet water temperature sensor; 134-Outlet water pressure sensor; 141-Second return water pipeline;

[0043] 210-heat exchanger; 211-cold end inlet; 212-cold end outlet; 213-hot end inlet; 214-hot end outlet; 220-first return water pipeline;

[0044] 300-water cooling circuit; 310-water chiller; 311-cold water inlet; 312-cold water outlet; 313-cooling inlet; 314-cooling outlet; 321-low-temperature water flow distribution valve; 322-first pipeline; 323-second pipeline; 324-third water supply pipe; 325-third return water pipeline; 326-flow regulating valve; 331-first water source pipeline; 332-second water source pipeline; 333-low-temperature cold water tank; 334-cooling pipeline; 335-first water supply valve; 336-water supply pump; 337-cold water temperature sensor; 338-cold water circulation pump; 339-automatic ice drop machine; 340-second water supply valve;

[0045] 400-Electronic control system;

[0046] 20-Engine. DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0048] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", "vertical" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] At the same time, it should be noted that the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, an integral connection, or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or the internal communication of two components, etc. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Figure 1 The schematic diagram of the structure of the multi-station high-flow engine water supply system 10 provided in this embodiment is shown. Figure 1 In this embodiment, the multi-station high-flow engine water supply system 10 can supply cooling water to multiple engines 20 stations. Figure 1 As shown, the multi-position large-flow engine water supply system 10 in this embodiment has 5 engines 20 positions, that is, the multi-position large-flow engine water supply system 10 can supply cooling water to the 5 engines 20. It can be understood that in some other embodiments, the number of engine 20 positions can also be specifically set according to needs, for example, set to 4 or 6.

[0052] The following is a further description of the multi-station high-flow engine water supply system 10 provided in this embodiment:

[0053] Please continue to refer to Figure 1 In this embodiment, the multi-station large-flow engine water supply system 10 includes a cooling water flow path 100 and a water cooling flow path 300 .

[0054] The cooling water flow path 100 has a cooling water inlet 111, a first cooling water flow path 112, a second cooling water flow path 114 and a plurality of flow distribution valves 120. The plurality of flow distribution valves 120 correspond to the plurality of engines 20 one by one, so that cooling water is supplied to the plurality of engines 20 respectively through the plurality of flow distribution valves 120. The first cooling water flow path 112 and the second cooling water flow path 114 are both connected to the cooling water inlet 111, so that part of the cooling water flowing from the cooling water inlet 111 enters the first cooling water flow path 112, and the other part enters the second cooling water flow path 114. The first cooling water flow path 112 is provided with a plurality of first water supply pipes 113 distributed along the flow direction, and the plurality of first water supply pipes 113 are connected to the plurality of flow distribution valves 120 one by one, so that the cooling water in the first cooling water flow path 112 is supplied to the corresponding engine 20 through the first water supply pipes 113 and the flow distribution valves 120.

[0055] The second cooling water flow path 114 is provided with a heat exchanger 210, through which the cooling water in the second cooling water flow path 114 is cooled and heat-exchanged, that is, the temperature of the cooling water in the second cooling water flow path 114 located downstream of the heat exchanger 210 is lower than the temperature of the cooling water in the first cooling water flow path 112. A plurality of second water supply pipes 115 are distributed along the flow direction of the second cooling water flow path 114 downstream of the heat exchanger 210. The plurality of second water supply pipes 115 are connected to the plurality of flow distribution valves 120 one by one, so that the cooling water in the second cooling water flow path 114 that has been cooled and lowered by the heat exchanger 210 enters the flow distribution valve 120 through the second water supply pipe 115, and the cooling water in the second water supply pipe 115 and the cooling water in the first water supply pipe 113 are mixed in a preset proportion according to the control of the flow distribution valve 120 and then supplied to the corresponding engine 20, so as to more accurately control the temperature of the cooling water entering the engine 20, and not only meet the constant cooling water supply demand of the target station, but also reduce the water flow involved in re-cooling, thereby avoiding energy waste caused by large-flow cooling water participating in cooling, so that the cooling water supply demand of multiple large-flow engines can be met through the chiller 310. During the test, the corresponding functions can be flexibly selected in multiple stations according to the test requirements, and it is helpful to realize online switching.

[0056] Specifically, in this embodiment, the multi-station high-flow engine water supply system 10 supplies cooling water to five engines 20. Accordingly, the number of flow distribution valves 120 in the multi-station high-flow engine water supply system 10 is five, and the number of first water supply pipes 113 and second water supply pipes 115 is also five. The flow distribution valve 120 has a first inlet 121, a second inlet 122 and a cooling water outlet 123. The five first water supply pipes 113 are respectively connected to the first inlets 121 of the five flow distribution valves 120, and the five second water supply pipes 115 are respectively connected to the second inlets 122 of the five flow distribution valves 120. The flow distribution valve 120 controls the flow ratio of the first water supply pipe 113 and the second water supply pipe 115 connected thereto and supplies the mixed cooling water to the corresponding engine 20 through the cooling water outlet 123.

[0057] It is understandable that when the multi-station high-flow engine water supply system 10 is used to supply cooling water to other number of engine stations, the number of flow distribution valves 120, first water supply pipes 113 and second water supply pipes 115 can also be specifically set according to the number of engine stations.

[0058] Figure 2 The schematic diagram of the structure of the flow distribution valve 120 of the multi-station large flow engine water supply system 10 provided in this embodiment supplies water to the engine 20. Figure 1 and Figure 2 In this embodiment, the cooling water outlet 123 of the flow distribution valve 120 is also provided with a water inlet pipe 131, which is connected to the cooling channel in the engine 20 through the water inlet pipe 131, so that the cooling water mixed by the flow distribution valve 120 is supplied to the engine 20 to meet the cooling demand of the engine 20. Optionally, the water inlet pipe 131 is also provided with a flow meter 132, an outlet water temperature sensor 133 and an outlet water pressure sensor 134. The flow meter 132 is used to measure the cooling water flow mixed by the flow distribution valve 120 to obtain the outlet water flow; the outlet water temperature sensor 133 is used to measure the temperature of the mixed cooling water to obtain the outlet water temperature; the outlet water pressure sensor 134 is used to measure the pressure of the mixed cooling water to obtain the outlet water pressure. The opening of the flow distribution valve 120 is adjusted according to at least one of the outlet water flow, outlet water temperature and outlet water pressure, so as to adjust the specific ratio value of the preset ratio to meet the cooling demand of the engine 20.

[0059] Figure 3 This is a schematic diagram of the structure of the water cooling flow path 300 in the multi-station high-flow engine water supply system 10 provided in this embodiment. Figure 1 and Figure 3In this embodiment, the water-cooling circuit 300 includes a chiller 310, and the chiller 310 is connected to the heat exchanger 210, so that cold water is provided to the heat exchanger 210 through the water-cooling circuit 300, thereby forming a cold end in the heat exchanger 210, and the end of the second cooling water circuit 114 connected to the heat exchanger 210 forms a hot end, and the cooling and hot ends exchange heat, thereby reducing the cooling water temperature in the second cooling water circuit 114.

[0060] Specifically, the heat exchanger 210 has a cold end inlet 211, a cold end outlet 212, a hot end inlet 213 and a hot end outlet 214. The cooling water of the second cold water flow channel flows into the heat exchanger 210 from the hot end inlet 213, and flows out from the hot end outlet 214 after heat exchange and cooling in the heat exchanger 210. The chiller 310 has a cold water inlet 311 and a cold water outlet 312. The cold water outlet 312 is connected to the cold end inlet 211 of the heat exchanger 210, so that cold water is supplied to the cold end of the heat exchanger 210 as a medium for cooling the cooling water in the second cold water flow channel. The normal temperature tap water from the cold water inlet 311 can be cooled to 5-12°C by the water cooling unit. Optionally, the heat exchanger 210 can adopt a plate heat exchanger 210.

[0061] Furthermore, the water cooling circuit 300 also includes a first pipeline 322, a low-temperature water flow distribution valve 321, and a second pipeline 323. The low-temperature water flow distribution valve 321 is installed at the cold water outlet 312 of the chiller 310, one end of the first pipeline 322 is connected to the low-temperature water flow distribution valve 321, and the other end is connected to the heat exchanger 210, so that cold water from the chiller 310 is supplied to the heat exchanger 210 through the first pipeline 322; one end of the second pipeline 323 is connected to the low-temperature water flow distribution valve 321, and the other end is connected to the second cooling water circuit 114, and the connection point is located downstream of the heat exchanger 210 and upstream of the second water supply pipe 115 closest to the heat exchanger 210. The cold water from the chiller 310 can be distributed through the low-temperature water flow distribution valve 321. According to demand, at least part of the cold water is controlled to enter the heat exchanger 210 through the first pipeline 322 to cool the cooling water in the second cooling water flow path 114. The remaining cold water directly enters the second cooling water flow path 114 through the second pipeline 323. This part of the cold water is supplied to the engine 20 through the second pipeline 323 as cooling water, thereby further reducing the temperature of the cooling water in the second pipeline 323, which helps to meet the cooling demand of the engine 20.

[0062] In this embodiment, the water cooling circuit 300 further includes a first water source pipeline 331, a cooling pipeline 334, a low-temperature cold water tank 333, and a first water return pipeline 220. The first water source pipeline 331 is in communication with the low-temperature cold water tank 333, thereby supplying water to the low-temperature cold water tank 333 to ensure the amount of water stored in the low-temperature cold water tank 333. Both ends of the cooling pipeline 334 are respectively connected to the low-temperature cold water tank 333 and the chiller 310 to supply water to the chiller 310. Both ends of the first water return pipeline 220 are respectively in communication with the heat exchanger 210 and the first water source pipeline 331 to realize cold water circulation.

[0063] Specifically, the cooling pipeline 334 is connected to the cold water inlet 311 of the chiller 310, and the cold water in the low-temperature cold water tank 333 is supplied to the chiller 310 according to demand. The chiller 310 cools the cold water and supplies it to the heat exchanger 210 through the cold water outlet 312 and the first pipeline 322. One end of the first return water pipeline 220 is connected to the cold end outlet 212 of the heat exchanger 210, and the other end is connected to the first water source pipeline 331, so as to guide the cold water passing through the heat exchanger 210 back to the low-temperature cold water tank 333.

[0064] Optionally, the first water supply pipeline 331 is further provided with a first water supply valve 335 and a water supply pump 336. The first water supply valve 335 is used to open and close the first water supply pipeline 331. When the first water supply valve 335 is opened, water in the external water source enters the low-temperature cold water tank 333 through the first water supply pipeline 331 under the pumping action of the water supply pump 336. The connection point between the first return water pipeline 220 and the first water supply pipeline 331 is located downstream of the first water supply valve 335. In this way, when the first water supply valve 335 is closed, the first return water pipeline 220 can still return water to the low-temperature cold water tank 333 through the first water supply pipeline 331. Optionally, a liquid level gauge can also be provided in the low-temperature cold water tank 333. When the liquid level in the low-temperature cold water tank 333 is lower than the set water supply level, water can be supplied to the low-temperature cold water tank 333.

[0065] Furthermore, the water-cooling circuit 300 further includes an automatic ice drop machine 339, which is disposed on the upper side of the low-temperature cold water tank 333 and is used to drop ice into the low-temperature cold water tank 333 to reduce the temperature of the cold water in the low-temperature cold water tank 333. Optionally, the water-cooling circuit 300 further includes a second water source pipeline 332, which is used to supply water required for ice making to the automatic ice drop machine 339. Specifically, one end of the second water source pipeline 332 is connected to the first water source pipeline 331, and the connection point is located downstream of the water supply pump 336, so that the water supply to the automatic ice drop machine 339 and the low-temperature cold water tank 333 can be achieved through the water supply pump 336. A second water replenishment valve 340 is also provided on the second water source pipeline 332, and the second water replenishment valve 340 is used to control the opening and closing of the second water source pipeline 332. In this way, when the water replenishment pump 336 is running, the low-temperature cold water tank 333 and / or the automatic ice drop machine 339 can be replenished with water by controlling the opening and closing or the opening degree of the first water replenishment valve 335 and the second water replenishment valve 340.

[0066] Optionally, a cold water temperature sensor 337 is further provided on the cooling pipeline 334, and the cold water temperature sensor 337 is used to detect the temperature of the cold water supplied to the chiller 310. Optionally, a cold water circulation pump 338 is further provided on the cooling pipeline 334, and the cold water in the low-temperature cold water tank 333 is pumped into the chiller 310 through the cold water circulation pump 338.

[0067] Furthermore, the multi-station high-flow engine water supply system 10 also includes a third water supply pipe 324, and the two ends of the third water supply pipe 324 are respectively connected to the first cooling water flow path 112 and the chiller 310, so that the cooling water in the first cooling water flow path 112 is introduced into the cooling unit through the third water supply pipe 324 to achieve cooling of the chiller 310. The multi-station high-flow engine water supply system 10 also includes a second return water pipeline 141 and a third return water pipeline 325, the second return water pipeline 141 is used to return the cooling water after cooling the multiple engines 20 to the water collection tank, and the two ends of the third return water pipeline 325 are respectively connected to the chiller 310 and the second return water pipeline 141, so that the cooling water after cooling the chiller 310 is introduced into the second return water pipeline 141.

[0068] Specifically, the chiller 310 also has a cooling inlet 313 and a cooling outlet 314. The third water supply pipe 324 is connected to the cooling inlet 313, so that the cooling water in the first cooling water flow path 112 is introduced into the chiller 310, which is used for the operation and heat dissipation of the chiller 310 to meet the cooling demand of the chiller 310. The third water return pipe 325 is connected to the cooling outlet 314, and the cooling water after cooling the chiller 310 enters the second water return pipe 141 through the third water return pipe 325, and then returns to the water collection tank, which is connected to the cooling water inlet 111, so as to form a cooling water cycle. In other words, the cooling water in the multi-station large-flow engine water supply system 10 is circulating water.

[0069] Optionally, a flow regulating valve 326 is provided on the third water supply pipe 324 , and the flow regulating valve 326 is used to regulate the flow of cooling water entering the chiller 310 .

[0070] In this embodiment, the multi-station high-flow engine water supply system 10 also includes an electronic control system 400, and various electrical components in the multi-station high-flow engine water supply system 10, such as sensors, valves, and pumps, are electrically connected to the electronic control system 400. Figure 1 The dashed line represents the electrical connection relationship, and the solid line represents the water connection relationship. The electronic control system 400 obtains the signals of each sensor to control other valves, pumps and other electrical components.

[0071] When the multi-station large-flow engine water supply system 10 provided by the embodiment of the present invention is used, after the engine 20 is started, the opening of the flow distribution valve 120 and the opening of the flow control valve 326 are first adjusted according to the outlet water temperature and the cooling demand of the engine 20 to ensure that the cooling water pressure and flow rate of the engine 20 under various working conditions meet the requirements on the basis of the normal operation of the chiller 310. When the outlet water temperature cannot meet the operating requirements of the engine 20, the opening of the flow distribution valve 120 can be adjusted according to the outlet water temperature signal detected by the outlet water temperature sensor 133, that is, the proportion of cooling water supplied by the second water supply pipe 115 can be increased. If the cooling demand of the engine 20 cannot be met by adjusting the opening of the flow distribution valve 120, the low-temperature water flow distribution valve 321 can be adjusted according to the outlet water temperature signal, so that part of the cold water flowing out of the cooling unit directly enters the second cooling water flow path 114 through the second pipeline 323. When the signal value of the cold water temperature sensor 337 is greater than the set temperature, or the outlet water temperature detected by the outlet water temperature sensor 133 is higher than the test requirement, the automatic ice drop machine 339 and the second water supply valve 340 are controlled to start and drop ice into the low-temperature cold water tank 333 to reduce the temperature of the cold water supplied to the chiller 310. At the same time, according to the liquid level information in the low-temperature cold water tank 333, the opening of the first water supply valve 335, the second water supply valve 340 and the low-temperature water flow distribution valve 321 are adjusted to ensure the dynamic balance of liquid level and temperature.

[0072] The multi-station large-flow engine water supply system 10 is provided with a variety of temperature adjustment modes and cold water supply modes, such as heat exchange after cold water, ice addition to increase cooling, and mixing of cooling water and cold water. During use, the cooling scheme can be adjusted according to the temperature feedback structure, which enhances the stability of the water supply temperature, speeds up the response speed of the system, and realizes the flexible supply of cooling water and cold water.

[0073] When designing the water supply system for multiple large-flow engines 20, the test bench with the largest engine 20 power is first selected, and the maximum heat exchange required for cooling water at a single bench is calculated based on the maximum cooling water flow required by the bench, the maximum natural supply water temperature in the laboratory in summer, and the required water temperature of the engine 20. Specifically, the maximum heat exchange Q 换 Determined according to the following formula:

[0074] Q 换 =c 水2 m 水 ΔT 2

[0075] ΔT 2 =T 冷却水 -T 柴

[0076] Among them, c 水2 is the specific heat capacity of cooling water; m 水T is the cooling water mass per unit time calculated by the maximum cooling water flow meter 132 required by the engine with the largest power among the multiple engines 20; 冷 is the natural water supply temperature; T 柴 The cooling water temperature required by the most powerful one among the multiple engines 20. Specifically, the natural water supply temperature can be set according to the average temperature or the maximum temperature in summer.

[0077] Secondly, according to the maximum heat transfer Q calculated above 换 Calculate and select the heat exchange area of ​​the heat exchanger 210. In order to ensure that the energy loss during the cold water circulation process does not affect the final supply temperature of the cooling water, the heat exchange area of ​​the heat exchanger 210 should be selected to ensure that the heat exchange amount Q is greater than the maximum heat exchange amount Q 换 , that is, Q>Q 换 Optionally, in this embodiment, the heat exchange capacity of the heat exchanger 210 can be set to 1.5 times the maximum heat exchange capacity, that is, Q = 1.5Q 换 .

[0078] Then, when setting the circulating water volume of the chiller 310, the temperature loss during the operation of the chiller 310 and the heat exchange efficiency of the plate heat exchanger 210 are considered, so a margin of 1°C to 2°C should be left compared to the temperature of the cold water out of the heat exchanger 210 and the temperature of the cooling water in the second water supply pipe 115. That is, based on the heat exchanger 210 selected above, the cold water temperature at the cold end outlet 212 of the heat exchanger 210 is calculated as the cold water temperature at the cold end outlet 212 of the heat exchanger 210, which is 1°C to 2°C lower than the theoretical cooling water temperature required in the second water supply pipe 115.

[0079] Finally, calculate the volume V of the low-temperature cold water tank according to the following formula:

[0080] V=V 机 +V 补 +V 水质管理

[0081] Vmachine=q 泵 *t / (ρ 水 ·c 水1 ΔT 1 )

[0082] V 水质管理 =5%(V 机 +V 补 )

[0083] Among them, V 补 is the volume required for ice throwing; q 泵 is the water circulation flow rate at the cold end of the chiller 310; t is the minimum operating time of the chiller 310; ρ 水is the density of cold water; c 水1 is the specific heat capacity of cold water; ΔT 1 It is the preset temperature fluctuation range.

[0084] Furthermore, the volume V required for ice throwing 补 The amount of heat Q ice required to reduce the heat can be calculated:

[0085] Q ice = m 冰 L 冰 +c 水 m 水1 ΔT 3

[0086] m 冰 =m 水3

[0087] Among them, L 冰 is the latent heat of melting of ice, c 水 is the specific heat capacity of water, ΔT 3 It is the temperature difference from the water temperature rising from 0°C to the outlet water temperature of the low-temperature cold water tank 333 (i.e. the temperature after refrigeration by the chiller 310).

[0088] At the same time, in order to ensure the accuracy of the water inlet parameters, the flow meter 132, the water outlet temperature sensor 133 and the water outlet pressure sensor 134 are arranged as close to the inlet of the engine 20 as possible.

[0089] An embodiment of the present invention also provides a method for supplying water to multiple engines with large flow rates. The method for supplying water to multiple engines with large flow rates is implemented based on the above-mentioned water supply system 10 for multiple engines with large flow rates. In other words, the electronic control system 400 in the above-mentioned water supply system 10 for multiple engines with large flow rates can execute the method for supplying water to multiple engines with large flow rates to realize control of the water supply system 10 for multiple engines with large flow rates.

[0090] Specifically, the method for supplying water to multiple engines with large flow rates comprises the following steps:

[0091] S01: Get the target station position.

[0092] The target position is determined according to the position of the engine 20 to be tested, and the target position is the position where the engine 20 that needs cooling is located.

[0093] S02: Control the flow distribution valve 120 corresponding to the target station position to operate.

[0094] Specifically, when the above-mentioned multi-station large-flow engine water supply system 10 is used for the first time, the multiple flow distribution valves 120 can be set to the state where the first water supply pipe 113 is fully open and the second water supply pipe 115 is fully closed, and then the flow distribution valve 120 corresponding to the target station is controlled to adjust the opening according to the cooling demand of the target station.

[0095] S03: Acquire the water output parameter of the flow distribution valve 120 corresponding to the target station position, and control the valve position of the flow distribution valve 120 according to the water output parameter.

[0096] The water outlet parameters include the water outlet temperature. Specifically, in the present embodiment, the water outlet parameters also include the water outlet pressure and the water outlet flow rate. The valve position of the flow distribution valve 120 is adjusted according to the water outlet temperature, thereby adjusting the ratio of cooling water flowing from the first water supply pipe 113 and the second water supply pipe 115. At the same time, the water outlet pressure and the water outlet flow rate are monitored to ensure that when the water outlet temperature meets the requirements, the water outlet pressure and the water outlet flow rate are within the required range.

[0097] At the same time, during the operation of the chiller 310, cooling water needs to be supplied through the third water supply pipe 324. Therefore, during the operation, the opening of the flow regulating valve 326 also needs to be adjusted. Specifically, when the multi-station high-flow engine water supply system 10 is used for the first time, the valve position of the flow regulating valve 326 can be set to open 1 / 3.

[0098] Since the multi-station high-flow engine water supply system 10 uses a chiller 310 for cooling and needs to meet the cooling demand in summer, during the test, if the cooling demand cannot be met by the adjustment in step S03, the low-temperature water flow distribution valve 321 can be controlled for adjustment. Accordingly, the multi-station high-flow engine water supply method can also include:

[0099] S04 : Control the valve position of the low-temperature water flow distribution valve 321 according to the water output parameters, so as to directly mix part of the cold water from the chiller 310 into the second cooling water flow path 114 .

[0100] By controlling the valve position of the low-temperature water flow distribution valve 321, part of the cold water is directly mixed into the second cooling water flow path 114, further reducing the cooling water temperature in the second cooling water flow path 114. Specifically, when the multi-station high-flow engine water supply system 10 is used for the first time, the valve position of the low-temperature water flow distribution valve 321 can be set to a position where both the first pipeline 322 and the second pipeline 323 are fully closed.

[0101] Furthermore, if the cooling requirement cannot be met by the adjustment in step S04, ice can be added to the low-temperature cold water tank 333 to further reduce the heat exchange efficiency by reducing the temperature of the cold water entering the chiller 310 to achieve the purpose of reducing the temperature of the cooling water in the second cooling water flow path 114. Accordingly, the water supply method for multiple engines with large flow rates can also include:

[0102] S05: Control the automatic ice drop machine 339 to drop ice into the low-temperature cold water tank 333 according to the water output parameters to reduce the temperature of the cold water.

[0103] Specifically, in the process of controlling the automatic ice dropper 339 to drop ice into the low temperature cold water tank 333, the second water replenishment valve 340 and the water replenishment pump 336 can be controlled to open according to demand. At the same time, the opening and closing of the first water replenishment valve 335 can also be controlled according to the liquid level in the low temperature cooling tank.

[0104] Specifically, when the multi-station high-flow engine water supply system 10 is used for the first time, the first water supply valve 335 and the second water supply valve 340 can be set to be fully closed. Then, during use, the first water supply valve 335 and the water supply pump 336 can be set to open when the liquid level in the low-temperature cold water tank 333 is less than or equal to 50%, so as to replenish the low-temperature cold water tank 333. When the liquid level in the low-temperature cold water tank 333 is greater than or equal to V 机 The stop condition of the automatic ice drop machine 339 can be set to be when the liquid level of the low-temperature cold water tank 333 reaches 95% or the temperature value of the water outlet temperature sensor 133 can meet the water temperature requirement of the engine 20.

[0105] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technology in the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A water supply system for multiple engines with large flow rates, wherein the multiple engines with large flow rates are used to supply cooling water to multiple engine positions; characterized in that: The multi-position flow engine water supply system comprises: A cooling water flow path, the cooling water flow path having a cooling water inlet, a first cooling water flow path, a second cooling water flow path and a plurality of flow distribution valves, the first cooling water flow path and the second cooling water flow path are both connected to the cooling water inlet; a plurality of first water supply pipes distributed along a flow direction are provided on the first cooling water flow path, and the plurality of first water supply pipes are respectively connected to the plurality of flow distribution valves in a one-to-one correspondence; a heat exchanger is provided on the second cooling water flow path, a plurality of second water supply pipes distributed along a flow direction are provided on a portion of the second cooling water flow path located downstream of the heat exchanger, and the plurality of second water supply pipes are respectively connected to the plurality of flow distribution valves in a one-to-one correspondence; the flow distribution valve is used to be connected to an engine, and is used to mix the cooling water in the first water supply pipe and the cooling water in the second water supply pipe according to a preset ratio, and supply the mixed cooling water to the engine; and A water-cooling flow path includes a water chiller, the water chiller is connected to the heat exchanger to provide cold water to the heat exchanger, and cools the cooling water in the second cooling water flow path through the heat exchanger.

2. The multi-station high-flow engine water supply system according to claim 1 is characterized in that: The water cooling circuit also includes a first pipeline, a low-temperature water flow distribution valve and a second pipeline; the low-temperature water flow distribution valve is installed at the cold water outlet of the chiller; one end of the first pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the heat exchanger to supply cold water from the chiller to the heat exchanger; One end of the second pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the second cooling water flow path, and the connecting point is located downstream of the heat exchanger and upstream of the second water supply pipe closest to the heat exchanger; The low-temperature water flow distribution valve is used to control the flow of the first pipeline and the second pipeline.

3. The water supply system for multiple engines with large flow rate according to claim 1, characterized in that: The water-cooling flow circuit also includes a first water source pipeline, a cooling supply pipeline, a low-temperature cold water tank and a first return water pipeline. The first water source pipeline is connected to the low-temperature cold water tank to supply water to the low-temperature cold water tank; the two ends of the cooling supply pipeline are respectively connected to the low-temperature cold water tank and the chiller to supply water to the chiller; the two ends of the first return water pipeline are respectively connected to the heat exchanger and the first water source pipeline to realize cold water circulation.

4. The water supply system for multiple engines with large flow rate according to claim 3 is characterized in that: The water cooling flow path also includes an automatic ice drop machine, which is arranged on the upper side of the low-temperature cold water tank and is used to drop ice into the low-temperature cold water tank to reduce the temperature of cold water in the low-temperature cold water tank.

5. The water supply system for multiple engines with large flow rate according to claim 4, characterized in that: The cooling pipeline is provided with a cold water temperature sensor, and the cold water temperature sensor is used to detect the temperature of the cold water supplied to the chiller.

6. The water supply system for multiple engines with large flow rate according to claim 3, characterized in that: The volume V of the low temperature cold water tank is determined by the following formula: V=V 机 +V 补 +V 水质管理 V machine = q 泵 *t / (ρ 水 ·c 水1 ·ΔT1) V 水质管理 =5%(V 机 +V 补 ) Among them, V 补 is the volume required for ice throwing; q 泵 is the water circulation flow rate at the cold end of the chiller; t is the minimum operating time of the chiller; ρ 水 is the density of cold water; c 水1 is the specific heat capacity of cold water; ΔT1 is the preset temperature fluctuation range.

7. The water supply system for multiple engines with large flow rate according to claim 1, characterized in that: The multi-station high-flow engine water supply system also includes a third water supply pipe, both ends of which are respectively connected to the first cooling water channel and the chiller, so as to introduce the cooling water in the first cooling water flow path into the chiller through the third water supply pipe and cool the chiller; The multi-unit high-flow engine water supply system also includes a second return water pipeline and a third return water pipeline. The second return water pipeline is used to return the cooling water after cooling the multiple engines to the collection tank; the two ends of the third return water pipeline are respectively connected to the chiller and the second return water pipeline to introduce the cooling water after cooling the chiller into the second return water pipeline.

8. The water supply system for multiple engines with large flow rate according to claim 1, characterized in that: The heat transfer capacity Q of the heat exchanger is determined by the following formula: Q>Q 换 Q 换 =c 水2 m 水 ΔT2 ΔT2=T 冷 -T 柴 Among them, c 水2 is the specific heat capacity of cooling water; m 水 T is the cooling water mass per unit time calculated based on the maximum cooling water flow required by the most powerful engine among multiple engines; 冷 is the natural water supply temperature; T 柴 The required cooling water temperature for the most powerful engine among multiple engines.

9. A method for supplying water to multiple engines with large flow rates, characterized in that: The method for supplying water to multiple engines with large flow rates is implemented according to the water supply system for multiple engines with large flow rates as claimed in claim 1; the method for supplying water to multiple engines with large flow rates comprises: Obtaining a target station position; wherein the target station position is the station position where the engine requiring cooling is located; Controlling the action of the flow distribution valve corresponding to the target station position; The water outlet parameters of the flow distribution valve corresponding to the target station position are obtained, and the valve position of the flow distribution valve is controlled according to the water outlet parameters; wherein the water outlet parameters include the water outlet temperature.

10. The water supply method for multiple engines with large flow rate according to claim 9, characterized in that: The water cooling circuit includes a first pipeline, a low-temperature water flow distribution valve and a second pipeline; the low-temperature water flow distribution valve is installed at the outlet of the chiller; one end of the first pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the heat exchanger to supply cold water from the chiller to the heat exchanger; One end of the second pipeline is connected to the low-temperature water flow distribution valve, and the other end is connected to the second cooling water flow path, and the connecting point is located downstream of the heat exchanger and upstream of the second water supply pipe closest to the heat exchanger; The water supply method for multiple large-flow engines also includes: The valve position of the low-temperature water flow distribution valve is controlled according to the water outlet parameters to directly mix part of the cold water from the chiller into the second cooling water flow path.

11. The water supply method for multiple engines with large flow rate according to claim 9, characterized in that: The water cooling flow path also includes a low-temperature cold water tank and an automatic ice drop machine, the low-temperature cold water tank is used to supply cold water to the chiller, and the automatic ice drop machine is arranged on the upper side of the low-temperature cold water tank; the water supply method for multiple high-flow engines also includes: The automatic ice drop machine is controlled to drop ice into the low-temperature cold water tank according to the water output parameters to reduce the cold water temperature.

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