Flow test distribution device, flow distribution system and diesel engine

Abstract

The flow test distribution device is arranged on each branch pipeline and comprises a measuring assembly and an adjusting assembly, and each measuring assembly comprises a first pressure test pipe section, a second pressure test pipe section and a resistance element located between the first pressure test pipe section and the second pressure test pipe section. The first pressure testing pipe section and the second pressure testing pipe section are respectively provided with a pressure monitoring component for obtaining the fluid pressure difference of the branch pipelines and further obtaining the flow distribution condition of each branch pipeline; and the adjusting assembly is arranged at the downstream of the measuring assembly and used for adjusting the output flow of the branch pipelines according to the flow distribution condition. The invention further provides a flow distribution system and a diesel engine. According to the flow test distribution device, the uniformity of fluid flow distribution can be improved in a limited arrangement space.

Description

Technical Field

[0001] The invention relates to the field of diesel engines, and in particular to the field of flow distribution. Background Art

[0002] In the structural design of diesel engines, a multi-branch pipeline arrangement is usually used for oil and water supply to meet the cooling and lubrication requirements of each cylinder and ensure the stable operation of the diesel engine. However, due to the limited layout space of the diesel engine, the branch pipeline structure of the system is complex, and the uniformity of the supply volume of each cylinder is difficult to ensure, which in turn affects the performance and reliability of each cylinder. Summary of the invention

[0003] An object of the present invention is to provide a flow test distribution device that can be installed in a limited layout space and improve the uniformity of fluid flow distribution.

[0004] In order to achieve the above-mentioned purpose, a flow test distribution device is arranged on each branch pipeline and includes a measuring component and an adjusting component. The measuring component includes a first pressure test pipe section, a second pressure test pipe section and a resistance element located between the first pressure test pipe section and the second pressure test pipe section. The first pressure test pipe section and the second pressure test pipe section are respectively provided with a pressure monitoring component for obtaining the fluid pressure difference of the branch pipeline, and then obtaining the flow distribution situation of each branch pipeline; the adjusting component is arranged downstream of the measuring component, and is used to adjust the output flow of the branch pipeline according to the flow distribution situation.

[0005] In one or more embodiments, the resistance element includes a throttling area and a guide area, the throttling area includes a throttling hole, and the inner wall forming the throttling hole is gradually contracted and expanded to generate energy loss. The guide area includes the guide hole.

[0006] In one or more embodiments, the resistance element includes a group of resistance elements with throttling holes and flow guide holes of different inner diameters, and each resistance element is replaceably arranged between the first pressure test pipe section and the second pressure test pipe section.

[0007] In one or more embodiments, the regulating assembly includes a throttling orifice plate.

[0008] In one or more embodiments, the regulating assembly includes a fixed plate with an eccentric circle and a movable plate with an eccentric circle. The movable plate is configured to rotate circumferentially, thereby changing the flow area of ​​the branch pipeline by the overlapping area with the eccentric circle of the fixed plate to achieve flow regulation.

[0009] In one or more embodiments, the outer periphery of the adjustment component is provided with adjustment scale marks.

[0010] In one or more embodiments, the adjustment assembly includes an axially moving part.

[0011] In one or more embodiments, the regulating assembly includes a valve body and a tapered slider, wherein the tapered slider regulates the output flow rate by axial movement relative to the valve body.

[0012] In one or more embodiments, the measuring component and the adjusting component are separate structures or integrated structures.

[0013] In one or more embodiments, the pressure monitoring component is a pressure sensor or a differential pressure gauge.

[0014] In one or more embodiments, the fluid in the branch pipeline is oil or water.

[0015] In one or more embodiments, the flow test distribution device further includes an inlet interface and an outlet interface.

[0016] Another object of the present invention is to provide a flow distribution system, comprising a fluid inlet, a fluid outlet and a plurality of parallel branch pipelines connecting the fluid inlet and the fluid outlet, each of the branch pipelines being provided with the above-mentioned flow test distribution device.

[0017] Another object of the present invention is to provide a diesel engine comprising the above flow distribution system.

[0018] The above-mentioned flow test distribution device has a compact and simple structure. The measuring component directly obtains the fluid pressure difference of each branch through the pressure monitoring components distributed in the first pressure test pipe section and the second pressure test pipe section, and then directly obtains the flow distribution situation without obtaining the specific flow value; the flow is adjusted using the adjustment component according to the flow distribution situation of each branch, so as to achieve uniform distribution of the fluid flow under limited installation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0020] Figure 1 is a cross-sectional view of one embodiment of a flow test distribution device;

[0021] Figure 2 is a parts exploded view of an embodiment of a flow test distribution device;

[0022] Figure 3 It is a structural diagram of the flow distribution system;

[0023] Figure 4 is a schematic diagram of the structure of the measurement component;

[0024] Figure 5 is a cross-sectional view of an embodiment of a resistance element;

[0025] Figures 6A-6D is a schematic diagram of a resistance element with throttle holes and guide holes of different inner diameters;

[0026] Figure 7 is a cross-sectional view of one embodiment of an adjustment assembly;

[0027] Figure 8 is an oblique view of an embodiment of an adjustment assembly;

[0028] Figures 9A-9B It is a schematic diagram of adjusting the scale mark at different rotation positions;

[0029] Figures 10A-10C It is a schematic diagram of different overlapping areas of eccentric circles;

[0030] Fig.11 It is a schematic diagram of the flow test distribution device being arranged in each branch pipeline of the cooling water;

[0031] Fig.12 It is a schematic diagram of the flow test distribution device being arranged on each branch pipeline of the valve seat lubricating oil;

[0032] Figures 13A-13B This is a comparison diagram of flow field streamlines without and with guide holes;

[0033] Figures 14A-14B This is a comparison chart of turbulent kinetic energy without and with the use of guide holes;

[0034] Figures 15A-15B This is a flow field pressure comparison diagram without and with the diversion holes;

[0035] Fig.16 is a cross-sectional view of another embodiment of a flow test distribution device;

[0036] Fig.17 is a schematic diagram of another embodiment of a flow test distribution device;

[0037] Fig.18 is a cross-sectional view of yet another embodiment of a flow test distribution device;

[0038] Fig.19 is a schematic diagram of the internal structure of another embodiment of a flow test distribution device;

[0039] Fig. 20A This is the test schematic diagram of the traditional differential pressure flowmeter;

[0040] Fig. 20B It is the test schematic diagram of the test component. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0042] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0043] In the structural design of diesel engines, a multi-branch pipeline arrangement is usually used for oil and water supply to meet the cooling and lubrication requirements of each cylinder and ensure the stable operation of the diesel engine. However, due to the limited layout space of the diesel engine, the branch pipeline structure of the system is complex, and it is difficult to ensure the uniformity of supply to each cylinder, which in turn affects the performance and reliability of each cylinder.

[0044] For example, if the cooling water supply of each cylinder is poorly uniform, some cylinders will have insufficient cooling water flow, resulting in increased cylinder liner temperature and cylinder scuffing, while some cylinders will have excessive cooling water flow and the temperature in the cylinder will be too low, which will increase carbon deposits and aggravate wear. For another example, if the lubricating oil supply of each cylinder valve seat is poorly uniform, some cylinders will have poor lubrication due to insufficient oil supply, while some cylinders will have carbon deposits due to excessive oil, affecting the valve sealing. Therefore, it is very important to monitor and adjust the flow distribution of each complex branch pipeline of the diesel engine in real time to ensure the uniformity of supply of each cylinder, which is very important for the safe and stable operation of the diesel engine.

[0045] In actual applications, traditional flow measurement products have high requirements for layout space, working environment, working medium, etc., and cannot be directly installed and used on diesel engine branch pipelines with tight layout space, complex pipeline structure, and harsh vibration environment.

[0046] As a kind of flow measurement product, the principle of differential pressure flowmeter is as follows Fig. 20A As shown in the figure, without considering energy loss, the continuity equation and Bernoulli equation are used for ideal fluids. The flow velocity changes due to significant changes in the flow area, and the pressure difference is obtained according to the velocity difference at nodes T and E. The measured pipeline flow is then derived through the pressure difference and throttling area. Considering the influencing factors such as the actual fluid viscosity and the local energy loss after throttling, in order to ensure the measurement accuracy, the differential pressure flowmeter is usually large in size and has strict requirements on pipeline installation and pressure point location. At the same time, it needs to be corrected according to the physical properties of the measured medium.

[0047] For example, Chinese patent CN117804554 proposes a variable pressure differential orifice flowmeter structure, which improves the measurement accuracy and solves the problem of inaccurate measurement of high-pressure and low-pressure airflows caused by the fixed diameter of the pressure differential orifice, but the structure is complex and difficult to adapt to the limited diesel engine layout space.

[0048] However, existing flow distribution and regulation schemes generally have problems such as complex system structure and poor integration. At the same time, due to the lack of effective and direct flow distribution feedback, the regulation accuracy is poor and the efficiency is low. For example, Chinese patent CN114198532A proposes a flow regulation structure of a circular pipe and multiple slave pipes vertically connected to the main pipe, but it is only applicable to regular pipes and there is no flow regulation feedback signal; Chinese patent CN117365726A proposes a flow uniform distribution adaptive regulation device applied to parallel cooling channels, by adding a resistance element with a resistance coefficient much larger than that of the pipe to each branch, so that the resistance of each branch is approximately equal, so as to improve the uniformity of the flow of each branch, and sense the flow change of the system through the upstream and downstream pressure difference, promote the adaptive adjustment of the resistance element, and alleviate the system power consumption caused by the resistance element, but the structure is complex and difficult to be applied to the compact space in the diesel engine.

[0049] For solutions for accurate flow testing, existing solutions are mainly aimed at flow detection of material gases, especially for the semiconductor processing industry. They have a small measurement range, high precision requirements, strict test environment, and complex test system, which are difficult to be directly applied to the diesel engine field. For example, Chinese patent CN117810130A proposes a chamber for processing wafers based on a fixed volume and its flow controller, which combines the ideal gas state equation to calculate and realize the calibration and measurement of gas flow; Chinese patent CN102829828A records a flow measurement device and a flow control device, which calculates and fits the relationship between gas pressure difference and voltage and temperature and combines the pressure difference-flow characteristic curve of gas under laminar flow state to realize the measurement of gas flow. The above technical solutions and test principles are significantly different from those in the diesel engine field.

[0050] Based on the above problems, the present invention proposes a flow rate test distribution device arranged on a branch pipeline.

[0051] like Figures 1 to 3 As shown, the flow test distribution device includes a measuring component 10 and an adjusting component 20, and also includes an inlet interface 30 and an outlet interface 40 at both ends, such as a flange or a pipe joint.

[0052] The regulating component 20 is arranged downstream of the measuring component 10, and is used to regulate the output flow of the branch pipeline 103. The system flow enters each branch pipeline after passing through the main integrated flow cavity. The branch flow is firstly monitored by the measuring component 10 for flow distribution, and the flow distribution is regulated according to the measurement result. The regulated branch flow enters each cylinder to ensure its supply uniformity.

[0053] The measuring assembly 10 includes a pressure test pipe section 11, a resistance element 12 and a pressure monitoring component 13, which is used to measure the fluid pressure difference of each branch pipeline 103, and then obtain the flow distribution of each branch pipeline 103. The measuring assembly 10 is different from a traditional differential pressure flow meter, such as Fig. 20B As shown in the figure, the measurement principle is to indirectly evaluate the flow rate by measuring the pressure difference after passing through the resistance element. The change in pressure difference comes from the energy loss after passing through the resistance element. The pressure difference test points are nodes T and F. The cross-sections of nodes T and F are equal to ensure that the pressure loss comes entirely from the energy loss, rather than the change in flow rate. When the internal flow channel structure is constant, the energy loss generated by the viscous fluid is uniquely related to the flow velocity v in the pipe. The test principle and pressure point location of this method are significantly different from those of traditional differential pressure flowmeters, and it can directly reflect the size of the flow distribution.

[0054] Continue to refer to Figure 4 As shown, the resistance element 12 is located between the first pressure test pipe section 111 and the second pressure test pipe section 112. The resistance element 12 includes a throttling area 120 and a guide area 122. The guide area 122 is distributed around the periphery of the throttling area 120 to achieve rapid stabilization of the flow field after throttling to facilitate pressure testing. The first pressure test pipe section 111 and the second pressure test pipe section 112 are respectively provided with a pressure monitoring component 13.

[0055] Figure 5 Further showing a schematic diagram of the resistance element 12, the throttling area 120 includes a throttling hole 123, and the inner wall 124 forming the throttling hole 123 is gradually contracted and expanded to throttle the fluid flowing through, causing energy loss. The throttling hole 123 can be one or more, such as Figures 6A-6D The number of throttling holes n, the hole size d, and the throttling hole length b are determined by comprehensive evaluation based on factors such as the viscosity and flow rate of the measured fluid.

[0056] The flow guide area 122 includes flow guide holes 125. The flow guide holes are designed around the periphery of the throttling area 120, which can achieve rapid stabilization of the flow field after throttling, and is convenient for pressure testing. Figures 13A-15B The figure shows the flow field comparison diagram before and after the use of the guide hole for the same resistance element. The verification results show that in the pipeline without the guide hole, the flow field after throttling produces a more obvious vortex P, the turbulent kinetic energy Q near the wall is larger, and the pressure fluctuation area is obvious, such as Fig.15AAs shown in the middle area N; in the pipeline with the guide hole, the flow field after throttling does not form an obvious vortex, the turbulent kinetic energy S near the wall is small, and the fluid pressure changes steadily, as shown in Fig. 15B As shown in the middle area N'.

[0057] The resistance element includes but is not limited to the above structure, and can be improved according to factors such as flow rate, medium viscosity, etc., and it is only necessary to ensure that the resistance element structure of each branch is consistent, that is, the resistance characteristics are consistent. In some embodiments, the resistance element can include a series of resistance elements with different inner diameter throttling holes and guide holes, and the resistance element can be replaced between the first pressure test pipe section and the second pressure test pipe section, and the resistance elements with different resistance characteristics can be replaced according to different working conditions.

[0058] The measuring component 10 can directly obtain the flow distribution of each branch by measuring the pressure difference before and after the resistance element. In some embodiments, the pressure test pipe section 11 has a threaded interface 16 for arranging a flow pressure monitoring component 13 such as a sensor or a differential pressure gauge to measure the pressure difference before and after throttling. The resistance element with a diversion design can effectively and quickly stabilize the flow field after throttling and reduce the straight section requirements. Preferably, the distance L between the pressure monitoring component 13 and the resistance element 12 is greater than or equal to 0.5 times the inner diameter D of the pressure test pipe section 11. In embodiments where specific flow values ​​need to be measured, the resistance characteristics of the flow resistance element used are first calibrated through a platform test to clarify the corresponding relationship between the pressure difference ΔP and the flow Q, and then the pressure difference is measured by this device and converted into flow.

[0059] The connection between the pressure test pipe section 11 and the resistance element 12 can be set as a detachable structure, such as setting the test section and the resistance element to be threaded; it can also be set as an integrated structure. For example, if solidified integration is required, welding can be used to simplify the structure.

[0060] Back to Figure 1 and Figure 2 The flow regulating component 20 is located downstream of the measuring component 10 and can form an integrated structure with the measuring component or a separate structure. Figure 1 As shown, the measuring device is directly integrated into the branch pipeline as a part of the pipeline, with a compact structure and high integration. The installation and testing conditions of each branch are consistent and are less affected by environmental factors. It is particularly suitable for diesel engines with highly compact and complex branch structures. Fig.16 As shown, the adjustment component 20 and the measuring component 10 are of split design and connected by a flange 50. This solution has a simple structure and is suitable for occasions where there is relatively ample space.

[0061] The regulating component 20 regulates the flow of the branches according to the pressure difference of each branch, and performs online regulation without stopping according to the flow distribution result measured by the measuring component 10, with convenient regulation, clear goals and high regulation efficiency.

[0062] In one embodiment of the regulating assembly 20, the regulating assembly 20 realizes flow regulation through a throttling orifice plate. Figures 7 to 10C As shown, the adjustment assembly includes a fixed plate 29 with an eccentric circle and a movable plate 28 with an eccentric circle, and also includes a sealing ring 27 and a locking screw 26. The movable plate 28 is configured to be circumferentially rotatable, for example, by manual rotation by a staff member, and then the flow area of ​​the branch pipeline is changed by the overlapping area with the eccentric circle of the fixed plate 29 to achieve flow adjustment. The outer periphery of the adjustment assembly is provided with adjustment engraved marks to accurately indicate the flow adjustment situation.

[0063] like Figures 7 to 10C As shown, when the pressure difference of a branch is large, it means that the flow rate distributed by the branch is large. Loosen the locking screw 26 and rotate the MAX scale mark on the outer periphery of the eccentric circle movable plate 28 away from the scale mark 41 on the outlet interface 40. When the MIN scale mark on the outer periphery of the eccentric circle movable plate 28 coincides with the scale mark 41 on the outlet interface 40, the MAX scale mark is 180° with the scale mark of the outlet interface 40. At this time, the flow area H is the smallest, the shielding area G is the largest, and the corresponding flow rate is adjusted to the minimum. The overlapping area of ​​the eccentric circle is as shown in FIG. Fig. 10C When the branch pressure difference is small, the MAX scale mark on the outer periphery of the eccentric circle movable plate 28 is rotated toward the scale mark of the outlet interface 40, and the overlap area of ​​the eccentric circle is as follows: Fig. 10A As shown, the eccentric circles overlap, the flow area is the largest, and finally the positioning is done by locking the screws. After the adjustment is completed, the pressure difference before and after each branch device is confirmed. When the pressure difference deviation of each branch is within the allowable range, the flow uniformity distribution meets the requirements, and the test and adjustment are completed.

[0064] In other embodiments of the regulating assembly 20, the regulating assembly 20 achieves flow regulation by changing the flow area through the axial movement of the axially movable component. Fig.18 and Fig.19 As shown, the regulating assembly 20 includes a valve body 201 and a tapered slider 202. The tapered slider 202 is connected to the valve body 201 through a plurality of circumferentially distributed connecting plates 204. A channel 203 is provided between the tapered slider 202 and the valve body 201. The tapered slider opens or closes the connection between the measuring assembly 10 and the channel 203 by its own axial movement, thereby regulating the output flow. This embodiment has a simple structure and is suitable for occasions with low axial space requirements.

[0065] The fluid in the branch pipeline includes but is not limited to oil or water. Fig.11It is shown that the flow test distribution assembly is arranged on each branch pipeline of the cooling water. One end of the flow test distribution device is connected to the cylinder head return water main pipe 301, and the other end is connected to the cylinder 303. Fig.12 It is shown that the test component of the flow test distribution component is arranged on each branch pipeline of the valve seat lubricating oil to uniformly adjust the lubricating oil. The valve seat lubrication system includes multiple branch pipelines, and the test component 10 of the flow test distribution device is arranged between the upstream 401 and the downstream 402 of each lubricating oil branch pipeline. The flow regulating component can select the existing flow regulating structure 400, and the flow regulating component and the test component are split structures.

[0066] The above device integrates the test device on each branch according to the characteristics of diesel engine fluid medium, flow rate, vibration environment, etc. Based on the measurement of resistance elements, the current branch flow distribution is obtained through the pressure difference before and after the device measured on each branch. According to the pressure difference of each branch, the flow is adjusted through the flow regulating mechanism in the device, which can effectively improve the uniformity of oil and water flow supply distribution in multi-branch complex pipelines and ensure the performance and reliability of each cylinder. In view of the compact layout space and complex branch pipeline structure of diesel engines, the structure is simple and small in size. The measuring device can be directly integrated into the branch pipeline. As a part of the pipeline, it has a compact structure and high integration. The adjustment component is adjusted online according to the flow distribution test results, which is convenient, targeted and efficient.

[0067] Combined with the introduction of the above device, we can also understand a flow distribution system, such as Figure 3 As shown, it includes a fluid inlet 101, a fluid outlet 102, and a plurality of parallel branch pipelines 103 connecting the fluid inlet and the fluid outlet, and each branch pipeline is provided with the above-mentioned flow test distribution device.

[0068] The flow distribution system obtains the real-time flow distribution of each branch by measuring the energy loss of each branch fluid flowing through the internal resistance element of the device. And by adjusting the internal flow area of ​​the measuring device, the flow uniformity of each branch is adjusted. This method has the characteristics of high measurement accuracy, compact structure, and good adaptability.

[0069] It can also be understood that a diesel engine including the above-mentioned flow distribution system can realize real-time testing and non-stop online adjustment of the supply pipeline flow distribution under the complex branch structure of the diesel engine, effectively improve the uniformity of oil and water flow supply distribution in multi-branch complex pipelines, ensure the performance and reliability of each cylinder, and provide guarantee for the safe and stable operation of the diesel engine.

[0070] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0071] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A flow test distribution device is provided on each branch pipeline, characterized in that: include: The measuring assembly comprises a first pressure test pipe section, a second pressure test pipe section and a resistance element located between the first pressure test pipe section and the second pressure test pipe section, wherein the first pressure test pipe section and the second pressure test pipe section are respectively provided with a pressure monitoring component for obtaining the fluid pressure difference of the branch pipeline, and then obtaining the flow distribution of each branch pipeline; as well as The regulating component is arranged downstream of the measuring component and is used to regulate the output flow of the branch pipeline according to the flow distribution situation.

2. The flow test distribution device according to claim 1, characterized in that: The resistance element includes a throttling area and a guide area, the guide area includes a guide hole, the throttling area includes a throttling hole, and the inner wall of the throttling hole is gradually contracted and expanded to generate energy loss.

3. The flow test distribution device according to claim 2, characterized in that: The resistance element comprises a group of resistance elements with throttling holes and flow guide holes of different inner diameters, and each resistance element can be replaceably arranged between the first pressure testing pipe section and the second pressure testing pipe section.

4. The flow rate test distribution device according to claim 1, characterized in that: The regulating assembly includes a throttling orifice plate.

5. The flow rate test distribution device according to claim 4, characterized in that: The regulating assembly includes a fixed plate with an eccentric circle and a movable plate with an eccentric circle. The movable plate is configured to be rotatable circumferentially, thereby changing the flow area of ​​the branch pipeline through the overlapping area with the eccentric circle of the fixed plate to achieve flow regulation.

6. The flow rate test distribution device according to claim 5, characterized in that: The outer periphery of the adjustment component is provided with adjustment scale marks.

7. The flow rate test distribution device according to claim 1, characterized in that: The adjustment assembly includes an axially movable component.

8. The flow rate test distribution device according to claim 7, characterized in that: The regulating assembly includes a valve body and a tapered slider, wherein the tapered slider adjusts the output flow rate by axial movement relative to the valve body.

9. The flow rate test distribution device according to claim 1, characterized in that: The measuring component and the adjusting component are of separate structures or integrated structures.

10. The flow rate test distribution device according to claim 1, characterized in that: The pressure monitoring component is a pressure sensor or a differential pressure gauge.

11. The flow rate test distribution device according to claim 1, characterized in that: The fluid in the branch pipeline is oil or water.

12. The flow rate test distribution device according to claim 1, characterized in that: The flow test distribution device also includes an inlet interface and an outlet interface.

13. A flow distribution system, characterized in that: include: fluid inlet; Fluid outlet; A plurality of parallel branch pipelines connecting the fluid inlet and the fluid outlet, each of the branch pipelines is provided with a flow test distribution device as described in any one of claims 1-12.

14. A diesel engine, characterized in that: Comprising the flow distribution system as claimed in claim 13.

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