A water supply system and method for hydraulic dynamometer

Abstract

The invention discloses a water supply system and method for a hydraulic dynamometer, belonging to the field of marine diesel engines. When a plurality of hydraulic dynamometers are operated in parallel using a set of water supply system, the water inlet pressure can be guaranteed to be stable and the temperature can meet the requirements. The system comprises a pump body, a regulating valve connected to the pump body outlet and a plurality of skids connected to the pump body, each skid being able to be connected to a diesel engine being tested; each skid is provided with a water flow path, and the water flow path in each skid comprises a main path for connecting to the diesel engine and a branch path for direct drainage; the pump body outlet pipeline where the regulating valve is located is used for unloading.

Description

Technical Field

[0001] The invention belongs to the field of ship diesel engines, and specifically relates to a water supply system and method for a hydraulic dynamometer. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The bench test system for marine low-speed diesel engines is a key support system for the main engine factory to ensure product qualification verification and production. Marine low-speed diesel engines need to undergo bench tests before leaving the factory, and the corresponding performance indicators must meet the design requirements and be approved by the classification society and the shipowner. The bench test stage is a series of performance tests before the low-speed diesel engine leaves the factory, including a series of verification tests on the basic functions of the diesel engine, fuel consumption, lubrication, cooling, emissions, power output characteristics, etc.

[0004] The hydraulic dynamometer is a device that provides the output power of the diesel engine. It uses water as a medium to convert the mechanical energy of the diesel engine into heat energy, and in the process measures the relevant operating parameters of the diesel engine. In order to ensure stable and reliable measurement, the hydraulic dynamometer must be provided with a reliable water source with stable pressure.

[0005] The inventor found that when multiple diesel engines are tested at the same time, a hydraulic dynamometer water supply system is independently arranged for each diesel engine, which can of course ensure stable operation of the water inlet pressure. However, under normal conditions, the cooling tower and the diesel engine bench test site are far apart, and the cost of arranging a system for each diesel engine is difficult to control, and the space involved is also relatively large, making it difficult to implement the arrangement. For example, when a hydraulic dynamometer water supply system is used to supply multiple diesel engines of different powers for simultaneous testing, the above problems can be effectively solved, but the diesel engines have different powers, and the corresponding dynamometer water inlet requirements are also different. At the same time, the load often changes during the diesel engine test (or there are other diesel engines still in operation, and some of them suddenly stop, etc.). The above will cause the water inlet pressure of the hydraulic dynamometer to be unstable. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hydraulic dynamometer water supply system and method, which can ensure that the water inlet pressure is stable and the temperature meets the requirements when multiple hydraulic dynamometers are operated in parallel using a set of water supply system.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, the technical solution of the present invention provides a water supply system for a hydraulic dynamometer, comprising a pump body, a regulating valve connected to the pump body outlet, and a plurality of skids connected to the pump body, each skid being capable of connecting to a diesel engine being tested; each skid having a water flow path, the water flow path in each skid comprising a main path for connecting to the diesel engine, and a branch path capable of directly discharging water; wherein the pump body outlet pipeline where the regulating valve is located is used for unloading.

[0009] In a second aspect, the technical solution of the present invention further provides a method for supplying water to a hydraulic dynamometer, using a hydraulic dynamometer water supply system as described in the first aspect to test multiple diesel engines at the same time, by controlling the regulating valve connected to the pump body outlet to adjust the water supply pressure of the main line, and by controlling the skid to control the water supply pressure required for each diesel engine.

[0010] The beneficial effects of the technical solution of the present invention are as follows:

[0011] 1) In the present invention, the regulating valve configured at the outlet of the circulating water pump of the hydraulic dynamometer can effectively control the outlet pressure to ensure the stability of the main pipeline pressure, and the regulating valve is separately connected to a processor, and the processor adjusts the regulating valve according to the sensor arranged on the main pipeline, which can ensure the accuracy and timeliness of the adjustment.

[0012] 2) In the present invention, a pressure-stabilizing pump and a processor for adjusting the pressure-stabilizing pump are separately arranged in the skid, and the pressure-stabilizing pump can stabilize the pressure of the main line to ensure that the water inlet pressure of the hydraulic dynamometer is stable when multiple hydraulic dynamometers are operated in parallel using a set of water supply system.

[0013] 3) In the present invention, the processor in the skid can further control the pressure-stabilizing pump according to the pressure of the branch. The skid is flexible to operate, which is convenient for changing and utilizing multiple machines, saving space and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0015] Figure 1 is a schematic diagram of a system according to one or more embodiments of the present invention.

[0016] In the figure: 11, the first circulating water pump, 12, the second circulating water pump, 2, the cooling water tower inlet, 3, the cooling water tower, 4, the hot water tank, 5, the first diesel engine, 51, the first skid, 511, the first processor, 512, the first pressure-stabilizing pump, 6, the second diesel engine, 61, the second skid, 611, the second processor, 612, the second pressure-stabilizing pump, 7, the third diesel engine, 71, the third skid, 711, the third processor, 712, the third pressure-stabilizing pump, 8, an independently arranged processor.

[0017] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0018] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0020] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0021] Terminology explanation section: The terms "installed", "connected", "connected", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in the field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances;

[0022] In the present invention, the hydraulic dynamometer is a device that uses the friction torque formed by water on the rotating rotor to absorb and transmit the output power of the power machinery;

[0023] Cooling tower: A structure used to cool water. Its principle is to use the convection formed by the incoming wind and the water sprinkled from above to remove the heat source. Part of the water evaporates in the convection and takes away the corresponding latent heat of evaporation, thereby lowering the water temperature.

[0024] As introduced in the background technology, in view of the shortcomings of the prior art, the purpose of the present invention is to provide a hydraulic dynamometer water supply system and method, which can ensure that the water inlet pressure is stable and the temperature meets the requirements when multiple hydraulic dynamometers are operated in parallel using a set of water supply system.

[0025] Example 1

[0026] In a typical embodiment of the present invention, Figure 1 As shown, Example 1 discloses a water supply system for a hydraulic dynamometer, comprising a cooling tower, a hot water tank 4, a circulating water pump, a pressure regulating valve, a test part connected to a diesel engine, and a water supply pump, wherein the cooling tower, the circulating water pump, the test part, and the hot water tank 4 are connected end to end in sequence to form a first circulation pipeline, wherein the cooling tower, the circulating water pump, the pressure regulating valve, and the hot water tank 4 are connected end to end in sequence to form a second circulation pipeline, and the cooling tower is also connected to the water supply pump.

[0027] The cooling tower and the hot water pool 4 all use existing components, and their specific structures are not described in detail.

[0028] The cooling tower and the hot water pool 4 are both equipped with a liquid level switch or a liquid level sensor, which is connected to the pressure regulating valve of the cooling tower and the pressure regulating valve of the hot water pool 4 to ensure safe operation. If the liquid level in the hot water pool is high, the water is pumped to the cooling tower. When the liquid level in the cooling tower is high, the water is pumped to the hot water pool. In addition, the cooling tower itself is equipped with an overflow port to discharge water.

[0029] The test part connected to the diesel engine is the main line, which is equipped with a pressure sensor. The pressure sensor feeds back the detected pressure signal to the controller, controls the opening of the pressure regulating valve after the circulation pump, and discharges the excess water to the hot water tank 4 through the second circulation pipeline, thereby ensuring the pressure stability of the main line.

[0030] It also includes a mobile pressure-stabilizing skid. In this embodiment, the main pipeline is connected to the diesel engine to be tested through the mobile pressure-stabilizing skid, and each mobile pressure-stabilizing skid is only connected to one diesel engine.

[0031] The movable voltage stabilizing skid blocks are all connected to the hot water tank 4.

[0032] Regarding the mobile pressure stabilizing skid, the present embodiment includes three mobile pressure stabilizing skids, namely the first skid 51, the second skid 61 and the third skid 71. Taking the first skid 51 as an example, it includes a first pressure stabilizing pump 512, a first isolation valve, a second isolation valve, a first check valve, a first processor 511, a first pressure regulating valve, a first pressure valve, a first safety valve, a third isolation valve, a fourth isolation valve, a first pneumatic regulating valve, a first branch pipeline and a first flow meter. The water inlet pipe of the first pressure stabilizing pump 512 is provided with a first isolation valve, and the water outlet pipe is continuously provided with a second isolation valve and a first check valve. The first pressure stabilizing pump 512 is also connected to the first pressure regulating pump 512. A processor 511; the water inlet pipe of the first pressure-stabilizing pump 512 is also connected to the first pressure regulating valve; the water outlet pipe of the first pressure-stabilizing pump 512 is also provided with a first pressure valve and a first safety valve, and the first safety valve is also connected to the first processor 511; the pipe section on the rear side of the first safety valve is used to connect to the first diesel engine 5 to be tested, and the pipe section between the first pressure valve and the first check valve is also connected to the first branch pipeline, and the first branch pipeline is connected to the hot water tank 4. The first branch pipeline is sequentially provided with a third isolation valve, a first pneumatic regulating valve and a fourth isolation valve, and the first pneumatic regulating valve is also connected to a first flow meter, and the first flow meter is connected to the first processor 511.

[0033] It can be understood that, in this embodiment, the pneumatic regulating valve is used as the main regulating valve.

[0034] The second skid 61 includes a second pressure-stabilizing pump 612, a fifth isolation valve, a sixth isolation valve, a second check valve, a second processor 611, a second pressure regulating valve, a second pressure valve, a second safety valve, a seventh isolation valve, an eighth isolation valve, a second pneumatic regulating valve, a second branch pipeline and a second flow meter. The connection relationship thereof refers to the first skid 51 and will not be repeated here.

[0035] The third skid 71 includes a third pressure-stabilizing pump 712, a ninth isolation valve, a tenth isolation valve, a third check valve, a third processor 711, a third pressure regulating valve, a third pressure valve, a third safety valve, an eleventh isolation valve, a twelfth isolation valve, a third pneumatic regulating valve, a third branch pipeline and a third flow meter. The connection relationship thereof refers to the first skid 51 and will not be repeated here.

[0036] The second diesel engine 6 is connected to the second skid 61 , and the third diesel engine 7 is connected to the third skid 71 .

[0037] In addition, in order to increase the water flow rate and the test power, two circulating water pumps are arranged side by side, and the pipeline connecting the cooling water tower 3 to the main pipeline is divided into two branches, respectively named as the first circulating water pump 11 pipeline and the second circulating water pump 12 pipeline. The front ends of the first circulating water pump 11 pipeline and the second circulating water pump 12 pipeline are connected to the cooling water tower 3, and the rear ends of the first circulating water pump 11 pipeline and the second circulating water pump 12 pipeline are connected to the main pipeline.

[0038] The first circulating water pump 11 pipeline is provided with a first circulating water pump 11 , and the second circulating water pump 12 pipeline is provided with a second circulating water pump 12 .

[0039] The pipeline on the front side of the first circulating water pump 11 is provided with a thirteenth isolating valve and a fourth pressure regulating valve in sequence, and the pipeline on the rear side is provided with a fourth pressure valve, a fourteenth isolating valve and a fourth check valve in sequence; the pipeline on the front side of the second circulating water pump 12 is provided with a fifteenth isolating valve and a fifth pressure regulating valve in sequence, and the pipeline on the rear side is provided with a fifth pressure valve, a sixteenth isolating valve and a fifth check valve in sequence.

[0040] In addition, an oblique tee is provided between the thirteenth isolation valve and the fourth pressure regulating valve, and an oblique tee is provided between the fifteenth isolation valve and the fifth pressure regulating valve.

[0041] A circulating water pump is also provided on the pipeline between the cooling tower and the hot water pool 4. In this embodiment, it is named the third circulating water pump. The pipeline on the front side of the third circulating water pump is provided with a seventeenth isolation valve and a sixth pressure regulating valve in sequence, and the pipeline on the rear side is provided with a sixth pressure valve, an eighteenth isolation valve and a sixth check valve in sequence.

[0042] In addition, a pneumatic regulating valve is also provided on the second circulation pipeline, and the pneumatic regulating valve on the second circulation pipeline is also connected to an independently arranged processor 8.

[0043] Based on the above valve design, in this embodiment, the skid can independently achieve the effect of separating the circulating water. After the circulating water passes through the pressure-stabilizing pump, it is divided into one path that directly flows into the hot water tank 4 and one path that enters the diesel engine. According to the adjustment of the processor, the flow ratio between the two paths can be flexibly adjusted to facilitate accurate testing.

[0044] The specific operation process of this embodiment is that tap water can replenish water to the cooling tower through the production water supply pipeline;

[0045] The circulating water pump discharges water from the cooling tower to the main pipe of the water supply pipeline. The main pipe is equipped with a pressure sensor. The pressure sensor feeds back the detected pressure signal to the control system to control the opening of the regulating valve after the pressure regulating pump, and discharges the excess water to the hot water pool 4, thereby ensuring the pressure stability of the main pipe;

[0046] The water in the main pipeline is distributed to each diesel engine through a mobile pressure stabilizing skid. When multiple hydraulic dynamometers are running at the same time, the corresponding water inflow is unstable due to the different power of the diesel engines and the frequent changes in load points. The water in the main pipeline is stabilized by a pressure stabilizing pump, and the feedback signal of the sensor after the pressure stabilizing pump controls the opening of the regulating valve to ensure the stability of the water inlet pressure of the dynamometer;

[0047] When one or more diesel engines suddenly stop, the main pipeline pressure rises suddenly. At this time, the processor opens the regulating valve on the second circulation pipeline to unload the water pressure to the return main pipeline to ensure the main pipeline pressure is stable.

[0048] The return water of the hydraulic dynamometer enters the hot water tank 4 through the return water main line, and then passes through the cooling tower to complete the working cycle.

[0049] Example 2

[0050] In a typical implementation of the present invention, Example 2 further discloses a method for supplying water to a hydraulic dynamometer, using the hydraulic dynamometer water supply system in Example 1, comprising the following steps:

[0051] The circulating water pump discharges water from the cooling tower to the main pipe of the water supply pipeline;

[0052] The water in the main pipeline is distributed to each diesel engine through the mobile pressure stabilizing skid. When multiple hydraulic dynamometers are running at the same time, the water in the main pipeline is stabilized by the pressure stabilizing pump. The feedback signal of the sensor after the pressure stabilizing pump controls the opening of the regulating valve to ensure the stability of the water inlet pressure of the dynamometer.

[0053] When one or more diesel engines suddenly stop, the processor opens the regulating valve on the second circulation pipeline to unload the water pressure to the return water main pipeline to ensure the stability of the main pipeline pressure;

[0054] The return water of the hydraulic dynamometer enters the hot water tank 4 through the return water main line, and then passes through the cooling tower to complete the working cycle.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water supply system for a hydraulic dynamometer, It is characterized in that It includes a pump body, a regulating valve connected to the pump body outlet, and a plurality of skids connected to the pump body, each skid can be connected to the diesel engine being tested; each skid has a water flow path, and the water flow path in each skid includes a main path for connecting to the diesel engine and a branch path for direct water discharge; wherein the pump body outlet pipeline where the regulating valve is located is used for unloading; the pump body includes a plurality of pump bodies, and the water outlets of the plurality of pump bodies are connected to the main path; the main path is connected to the plurality of skids; Wherein, the water supply system of the hydraulic dynamometer further comprises a cooling water tower and a hot water pool, the cooling water tower is connected to a water source, the hot water pool is connected to the cooling water tower and the plurality of skids, and the hot water pool is also connected to the pump body; The skid includes a pressure-stabilizing pump, the outlet of which is divided into a main path for connecting to the diesel engine and a branch path for direct drainage; the processor is also connected to the processor located in the skid; The pump body discharges water from the cooling tower to the main pipe of the water supply pipeline. The main pipe is equipped with a pressure sensor. The pressure sensor feeds back the detected pressure signal to the control system to control the opening of the regulating valve after the pump body and discharge the excess water into the hot water pool, thereby ensuring the pressure stability of the main pipe; The water in the main line is distributed to each diesel engine through the skid. When multiple hydraulic dynamometers are running at the same time, the corresponding water intake is unstable due to the different power of the diesel engines and the frequent changes in load points. The water in the main line is stabilized by a pressure-stabilizing pump, and the feedback signal of the sensor after the pressure-stabilizing pump controls the opening of the regulating valve to ensure the stability of the water inlet pressure of the hydraulic dynamometer.

2. A water supply system for a hydraulic dynamometer as claimed in claim 1, It is characterized in that A regulating valve is arranged on the pipeline connecting the hot water pool to the pump body, and the regulating valve is connected to the processor.

3. A water supply system for a hydraulic dynamometer as claimed in claim 1, It is characterized in that The water outlet of the tested diesel engine is connected to the hot water tank.

4. A water supply system for a hydraulic dynamometer as claimed in claim 1, It is characterized in that The processor is also connected to a flow meter connected to the regulating valve on the branch line.

5. A method for supplying water to a hydraulic dynamometer, It is characterized in that Using a hydraulic dynamometer water supply system as described in any one of claims 1 to 4, multiple diesel engines are tested simultaneously, the water supply pressure of the main pipeline is adjusted by controlling the regulating valve connected to the pump body outlet, and the water supply pressure required by each diesel engine is controlled by the skid.

6. A method for supplying water to a hydraulic dynamometer as claimed in claim 5, It is characterized in that The following steps are involved: The pump body is supplied to the main pipeline; The water in the main pipeline is distributed to each diesel engine through the skid. When multiple hydraulic dynamometers are running at the same time, the water in the main pipeline is stabilized by the skid. When one or more diesel engines suddenly stop, the regulating valve connected to the pump body outlet is opened to unload the water pressure to ensure the stability of the main pipeline pressure.

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