Throttling structure, pipeline, fluid conveying system and driving assembly

Abstract

The invention relates to the technical field of fluid conveying, in particular to a throttling structure, a pipeline, a fluid conveying system and a driving assembly. The throttling structure is used for being installed in a conveying pipe and comprises a first throttling unit. The first throttling unit comprises an inlet section and a hole distribution section communicated with the inlet section, and the inlet section comprises a first sealing part matched with the pipe wall of the conveying pipe; a plurality of throttling channels are arranged in at least partial area of the hole distribution section; the hole distribution section extends in the conveying direction of fluid in the corresponding conveying pipe or the axial direction of the inlet section. According to the throttling structure, on the premise that machining difficulty and cost are not increased, throttling, pressure dividing and flow distribution of fluid in at least part of branches in the fluid conveying system can be effectively achieved, and the risk of pollutant blockage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid transportation, and in particular to a throttling structure, a pipeline, a fluid transportation system and a driving assembly. Background Art

[0002] The vehicle-mounted drive motor and its control system have achieved a shared cooling circuit for the motor and reducer through an integrated design. The cooling circuit adopts a series-parallel topology and changes the flow resistance relationship by adjusting the inner diameter of the passage to adjust the flow of each branch and improve the system efficiency. However, this design faces problems such as unreasonable flow distribution, limited processing capacity and contaminant blockage. Summary of the invention

[0003] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a throttling structure, pipeline, fluid delivery system and drive assembly, which can effectively realize the throttling of the fluid in the delivery pipe and reduce the risk of contaminant blockage without increasing the difficulty and cost of processing; the coordinated use of multiple throttling structures can realize the precise distribution and control of the delivery pipe flow of at least most branches in the fluid delivery system.

[0004] In order to achieve the above-mentioned object and other related objects, the present invention provides a throttling structure for installing in a delivery pipe, the throttling structure comprising:

[0005] A first throttling unit, the first throttling unit comprising an inlet section and a hole distribution section communicating with the inlet section;

[0006] The inlet section includes a first sealing portion that cooperates with the wall of the delivery pipe; at least part of the area of ​​the hole section is provided with a plurality of throttling channels; the hole section extends along the delivery direction of the fluid in the corresponding delivery pipe or the axial direction of the inlet section.

[0007] As one embodiment of the present invention, the throttling structure further includes a second throttling unit, and the second throttling unit is arranged on a side of the hole distribution section away from the inlet section;

[0008] The second throttling unit includes a flow channel connecting its two sides along the fluid conveying direction, the minimum flow cross-sectional area of ​​the flow channel is greater than or equal to the minimum flow cross-sectional area of ​​the throttling channel, and the flow channel is connected to the first inner cavity of the first throttling unit through the throttling channel.

[0009] As one embodiment of the present invention, the second throttling unit includes a second sealing portion that cooperates with the inner wall of the delivery pipe, and the flow channel is arranged in an annular area enclosed by the second sealing portion.

[0010] As one embodiment of the present invention, a gap area is formed between the second sealing part and the first sealing part; the throttling channel connects the gap area and the first inner cavity of the first throttling unit; and the flow channel is connected to each of the throttling channels through the gap area.

[0011] As one embodiment of the present invention, along the radial direction of the inlet section, the hole distribution section includes at least one first side area, and the first side area and the outer wall of the first sealing portion are spaced apart in the radial direction of the first throttling unit;

[0012] The throttling channel is at least arranged in a first side area of ​​the hole distribution section, and the first side area is a part formed by the gap area.

[0013] As one embodiment of the present invention, the circulation channel is a hole-like or slit-like structure for fluid circulation or a gap between two parts capable of relative movement, and / or the throttling channel is a hole-like or slit-like structure for fluid circulation or a gap between two parts capable of relative movement.

[0014] As one embodiment of the present invention, the throttling channels are at least arranged in an array in the first side area.

[0015] As one embodiment of the present invention, the aperture of the throttling channel at one end close to the first inner cavity of the first throttling unit is smaller than or equal to the aperture of the throttling channel at one end away from the first inner cavity of the first throttling unit.

[0016] As one embodiment of the present invention, the maximum effective aperture of the throttling channel is less than or equal to 0.7 mm.

[0017] As one embodiment of the present invention, the first throttling unit and the second throttling unit are integrally formed injection molded parts.

[0018] To achieve the above-mentioned object and other related objects, the present invention provides a pipeline, including a delivery pipe and the throttling structure installed in the delivery pipe;

[0019] At least the first sealing portion of the throttling structure is configured to be able to form a seal or be integrally connected with the delivery pipe.

[0020] As one embodiment of the present invention, at least the first throttling unit of the throttling structure is located in the delivery pipe.

[0021] As one embodiment of the present invention, the first sealing portion and / or the second sealing portion is sealed by interference fit with the inner wall of the conveying pipe, or is sealed by contact with the end face of the conveying pipe, or is sealed and connected to the conveying pipe via a sealing ring.

[0022] As one embodiment of the present invention, the ratio of the length to the aperture of the delivery pipe is less than or equal to 4.

[0023] As one embodiment of the present invention, the pipeline further includes a limiting structure for limiting the movement of the first throttling unit and / or the second throttling unit relative to the delivery pipe.

[0024] To achieve the above object and other related objects, the present invention provides a fluid delivery system including the above pipeline.

[0025] To achieve the above-mentioned purpose and other related purposes, the present invention provides a drive assembly, including a delivery unit, a filter unit, a reducer and a motor which are connected in sequence through a main pipeline; at least the reducer and the motor are provided with the pipeline, and the pipeline is connected to the main pipeline.

[0026] In summary, in the present invention, when the flow rate of the fluid in the delivery pipe is not restricted or the minimum flow cross-sectional area required for limiting the flow rate of the fluid in the delivery pipe is exactly equal to the inner diameter cross-sectional area of ​​the inlet section of the throttling structure, or the inner diameter cross-sectional area of ​​the inlet section can be set to the flow cross-sectional area required for limiting the flow rate of the fluid in the corresponding delivery pipe according to actual needs, and the minimum inner diameter of the inlet section allows all obstructions to pass through, since the hole-laying section is extended along the delivery direction of the fluid in the corresponding delivery pipe or the axial direction of the inlet section, the hole-laying section of the first throttling unit is equipped with as many throttling channels as possible, and the throttling channels can be set at the hole-laying section. The end face and side face, so that even if a small number of throttling channels are blocked after the throttling structure has been used for a long time, the sum of the minimum flow cross-sectional areas of all the remaining throttling channels that can still be used normally can still be greater than or equal to the cross-sectional area of ​​the inner diameter of the inlet section, thereby ensuring that the system flow demand is not affected, thereby meeting the flow demand at the front and rear ends of the delivery pipe, and these throttling channels can not only change the flow resistance to achieve partial pressure, but also have a filtering function, effectively reducing the risk of contaminant blockage, and the inner diameter area of ​​the inlet section is set to the flow cross-sectional area required for the flow limitation of the fluid in the corresponding delivery pipe, then the throttling effect on the delivery pipe can be achieved. In this case, since the inner diameter cross-sectional area of ​​the inlet section can be set to the required flow cross-sectional area for flow restriction of the fluid in the corresponding delivery pipe according to actual needs, and the inner diameter of the inlet section is relatively small, the length of the second throttling unit can also be reduced accordingly, avoiding the problem of increased processing difficulty caused by excessive aspect ratio, thereby reducing manufacturing cost and difficulty; the coordinated use of multiple throttling structures can realize precise distribution and control of the flow of delivery pipes in at least most branches of the fluid delivery system; the throttling structure can optimize the aspect ratio of the delivery pipes of each branch without increasing the difficulty and cost of processing, and adjust the flow resistance relationship and proportion of each branch, thereby significantly improving the reliability of the fluid delivery system and the rationality of flow distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the structure of a common cooling circuit for a reducer and a motor according to the present invention;

[0029] Figure 2 A schematic diagram of a topological structure for adjusting flow rate by reducing the inner diameter of a pipeline in the prior art, wherein multiple circles represent the positions of nozzles;

[0030] Figure 3 It is a schematic diagram of the structure of a throttling structure in one embodiment of the present invention after being cut apart;

[0031] Figure 4 It is a structural cross-sectional view of a throttling structure in another embodiment of the present invention installed in a pipeline;

[0032] Figure 5 Schematic diagram of the flow of fluid in a throttling structure in one embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of a three-dimensional structure of a throttling structure in an embodiment of the present invention;

[0034] Figure 7 It is a structural schematic diagram of one side of a throttling structure in one embodiment of the present invention;

[0035] Figure 8 for Figure 7 AA structural cross-sectional view;

[0036] Fig. 9 It is a schematic diagram of the structure of the other side of the throttling structure in one embodiment of the present invention;

[0037] Fig.10 for Fig. 9 BB structure cross-sectional view;

[0038] Explanation of component numbers: throttling structure 10, delivery pipe 20, limiting structure 201, first throttling unit 1, inlet section 11, first sealing portion 111, hole distribution section 12, first side area 121, throttling channel 1211, first inner cavity 122, gap area 13, second throttling unit 2, second sealing portion 21, circulation channel 22, main line 31, branch line 32, nozzle position 33. DETAILED DESCRIPTION

[0039] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0040] See also Figures 1 to 10 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0041] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are familiar to those skilled in the art and the description of the present invention, and any methods, equipment and materials of the prior art similar or equivalent to the methods, equipment and materials described in the embodiments of the present invention can also be used to implement the present invention.

[0042] See also Figure 1-2 The vehicle-mounted drive motor and its control system include motor and reducer components. To achieve integration, lightness and miniaturization, the reducer and drive motor cooling circuits can be shared, and reducer lubricating oil can be used to cool and lubricate the motor heating components (such as the motor stator and rotor) and transmission components (such as bearings); Figure 1 As shown, an oil circuit topology of an integrated oil-cooled electric drive is shown;

[0043] In the above design, the cooling circuit includes several series trunks and parallel branches, which are directed to different components or nodes that need to be lubricated and cooled respectively; the flow of each trunk and branch is equal to the discharge flow of the oil pump after being aggregated, which can be adjusted by the speed of the oil pump. Figure 1 A possible topology of the series-parallel relationship between nodes is shown, where the topology here refers to the connection method and arrangement and combination relationship between the nodes in the cooling circuit.

[0044] In the above design, the lubrication flow demand of each branch node is determined by its respective load, for example, for the bearing, it is the angular velocity, axial and radial force; for the gear shaft, it is the slip and normal pressure; for the motor stator, it is the line current amplitude; for the motor rotor, it also includes the iron loss part; the above flow demand is generally implemented by adjusting the diameter size of the main road and the branch to change the pressure drop along the branch, thereby changing the flow resistance relationship and ratio between the branches, thereby affecting the distribution of the overall flow of the oil pump between the branches, wherein the pipes of the main road and the branch are generally formed by casting, stamping and / or machining, such as Figure 2 A main circuit 31 / branch circuit 32 and nozzle position 33 of an integrated oil-cooled electric drive are shown.

[0045] See also Figure 1-2 , the main bottlenecks of the above implementation are:

[0046] First, due to the topology, the oil is supplied from the reducer end, that is, the starting point of the main line is on the gear shaft side and the distal end is on the motor side. The overall system back pressure has the characteristic of "higher on the reducer side than on the motor side", which leads to the same size of nozzles / pipes. The corresponding flow release value at the front end (reducer side) is higher than that at the rear end (motor side); and generally, the cooling flow required at the rear end of the oil circuit (motor stator and rotor) is numerically much larger than that at the front end (reducer side), so the design needs to increase the front end flow resistance to increase the rear end distribution amount, and accordingly, the front end pipeline and nozzle diameter need to be reduced.

[0047] Second, the adjustment of branch diameter is limited by the processing and forming capabilities, and the variable range is relatively narrow. For metal parts, the minimum diameter of deep tubes formed by casting is not less than 6mm to 8mm, and the aspect ratio is generally not more than 10 times (and decreases with the decrease of the diameter); the minimum diameter of nozzles formed by machining is generally not less than 1mm, and the aspect ratio is generally not more than 3 times; these processing capacity bottlenecks may conflict with the aforementioned demand of "reducing front-end allocation"; breaking through the above processing capacity bottlenecks will bring about the cost of increased difficulty in part processing, shortened tool scrapping cycle, and increased costs.

[0048] Third, the cleanliness requirements of the cooling circuit system of the whole machine generally constrain the maximum particle diameter and the maximum fiber length. In a typical oil-cooled electric drive system, the maximum diameter of the above-mentioned polluted particles is generally between 0.6mm and 1mm, and the maximum length of the polluted fibers is generally between 2mm and 3mm. The above-mentioned pollutants may exist in the circuit, blocking pipes and nozzles with a diameter of about 1mm. The above-mentioned bottleneck of cleanliness capability may conflict with the aforementioned demand of "reducing the diameter to adjust the front and rear end distribution". Breaking through the above-mentioned bottleneck of cleanliness capability will lead to an increase in the system cleanliness requirements and an increase in the difficulty of protecting all oil-related components during processing and transportation, which will ultimately be reflected in a significant increase in costs.

[0049] In summary, due to the system topology, the back pressure on the reducer side is higher than that on the motor side, and the front-end flow distribution needs to be optimized by adjusting the front-end flow resistance, but this is limited by the processing and molding capabilities; secondly, the minimum diameter and aspect ratio of metal parts are limited, and reducing the diameter will increase the processing difficulty and cost; finally, the system cleanliness requirements limit the particle diameter and fiber length to ensure that small-diameter pipelines are not blocked, but this also increases the protection difficulty and cost; these factors jointly affect the design of the cooling circuit, and it is necessary to find a balance between flow distribution, processing capabilities and cleanliness.

[0050] In view of the above problems, the present invention describes a throttling structure 10 that directly realizes flow resistance control / flow regulation without excessively strict control of machining and casting dimensions, and simultaneously avoids the risk of contaminant blockage. In this case, the throttling structure 10 is installed in a delivery pipe 20 for use. The delivery pipe 20 is not limited to the technical field, and can be a pipe in any field, such as the mechanical field, medical field, chemical field, electric power field, construction field, and agricultural field.

[0051] See also Figure 3 Or 4-6, the present invention provides a throttling structure 10 for installation in a delivery pipe 20, the throttling structure 10 includes a first throttling unit 1, the first throttling unit 1 includes an inlet section 11 and a hole section 12 connected to the inlet section 11, the inlet section 11 includes a first sealing portion 111 that cooperates with the wall of the delivery pipe 20; at least a partial area of ​​the hole section 12 is provided with a plurality of throttling channels 1211; the hole section 12 is extended along the delivery direction of the fluid in the corresponding delivery pipe 20 or the axial direction of the inlet section 11.

[0052] It should be noted that the first throttling unit 1 at least includes an inlet section 11 and a hole section 12, the inlet section 11 and the hole section 12 are connected, the first sealing portion 111 is generally located at one end of the inlet section 11 away from the hole section 12 or on the outer circumferential surface of the inlet section 11, and the first sealing portion 111 is tightly matched with the end face or inner wall of the delivery pipe 20 to achieve a sealing effect; it should be understood that the fluid can enter from the inlet section 11 of the first throttling unit 1 and then flow out from the hole section 12, and the first sealing portion 111 is to seal the gap between the delivery pipe 20 and the first throttling unit 1, so that the fluid flows into the delivery pipe 20 and then passes through the first throttling unit 1 for throttling and filtration; it can be set that there is a gap between the outer contour of the hole section 12 and the delivery pipe 20 A gap is formed so that the fluid in the perforated section 12 can flow into the delivery pipe 20 through the gap, or along the setting direction of the perforated section 12, the outer contour projection of the perforated section 12 is at least partially located in the enclosed area of ​​the outer contour projection of the first sealing portion 111, so that the fluid in the perforated section 12 can flow into the delivery pipe 20 through the throttling channel 1211 on the end face and / or side wall of the perforated section 12, and combined with the perforated section 12 with a longer length, the number of throttling channels 1211 can be increased. For example, the throttling channel 1211 can be arranged on the end face and side of the perforated section 12, so as to increase the sum of the minimum flow cross-sectional areas of all the throttling channels 1211 and make it greater than or equal to the minimum flow cross-sectional area required for throttling of the delivery pipe 20.

[0053] In the present case, the throttling structure 10 is installed in the delivery pipe 20 to optimize the distribution of fluid flow; the fluid can be a coolant for cooling, or an oil for lubrication, or water for other purposes, etc.; the fluid first enters from the inlet section 11 of the first throttling unit 1, and then flows out to the inside of the delivery pipe 20 through the hole section 12. A plurality of throttling channels 1211 are provided in the hole section 12. These throttling channels 1211 have a filtering effect on the fluid. Compared with the traditional throttling method of directly reducing the inner diameter of the delivery pipe 20 (for example, the delivery pipe 20 can be regarded as having only one throttling channel 1211), the present case can effectively reduce the risk of blockage and failure of the hole section 12 by setting a large number of throttling channels 1211. When there is no restriction on the flow rate of the fluid in the delivery pipe 20 or the inner diameter of the flow rate restriction of the fluid in the delivery pipe 20 is exactly equal to the inner diameter of the inlet section 11 of the throttling structure 10, the throttling channel 1211 of the hole section 12 plays the role of pressure division and filtration of the fluid in the delivery pipe 20, and the inner diameter of the inlet section 11 plays the role of throttling. The size of the throttling channel 1211 needs to be set according to the size of the actual filter material to achieve at least filtering most or all of the filter material. Since the hole section 12 extends along the delivery direction of the fluid in the corresponding delivery pipe 20 or the axial direction of the inlet section 11, the length of the hole section 12 can be set according to actual needs to achieve as many throttling channels 1211 as possible, so that within the service life of the throttling structure 10, after the throttling structure 10 has been used for a long time and some of the throttling channels 1211 are blocked, the sum of the minimum flow cross-sectional areas of all the remaining throttling channels 1211 that can still be used normally is greater than or equal to the inner diameter of the delivery pipe 20, so as to achieve the purpose of meeting the use requirements.

[0054] In the present case, when the flow rate of the fluid in the delivery pipe 20 is not restricted or the minimum flow cross-sectional area required for limiting the flow rate of the fluid in the delivery pipe 20 is exactly equal to the inner diameter cross-sectional area of ​​the inlet section 11 of the throttling structure 10, or the inner diameter cross-sectional area of ​​the inlet section 11 can be set to the flow cross-sectional area required for limiting the flow rate of the fluid in the corresponding delivery pipe 20 according to actual needs, and the minimum inner diameter of the inlet section 11 allows all obstructions to pass through, since the hole section 12 is extended along the delivery direction of the fluid in the corresponding delivery pipe 20 or the axial direction of the inlet section 11, the hole section 12 of the first throttling unit 1 is equipped with as many throttling channels 1211 as possible, and the throttling channels 1211 can be set in the hole section 1 2, so that even if a small number of throttling channels 1211 are blocked after the throttling structure 10 has been used for a long time, the sum of the minimum flow cross-sectional areas of all the remaining throttling channels 1211 that can still be used normally can still be greater than or equal to the cross-sectional area of ​​the inner diameter of the inlet section 11, thereby ensuring that the system flow demand is not affected, thereby meeting the flow demand of the front and rear ends of the delivery pipe 20, and these throttling channels 1211 can not only change the flow resistance to achieve partial pressure, but also have a filtering function, effectively reducing the risk of contaminant blockage, and the inner diameter area of ​​the inlet section 11 is set to the flow cross-sectional area required for the flow restriction of the fluid in the corresponding delivery pipe 20, so that the throttling effect on the delivery pipe 20 can be achieved. In the present case, since the inner diameter cross-sectional area of ​​the inlet section 11 can be set to the required flow cross-sectional area for flow restriction of the fluid in the corresponding delivery pipe 20 according to actual needs, and the inner diameter of the inlet section 11 is relatively small, the length of the second throttling unit 2 can also be reduced accordingly, avoiding the problem of increased processing difficulty caused by an excessively large aspect ratio, thereby reducing the manufacturing cost and difficulty; the throttling structure 10 of the present case can achieve precise control of the flow distribution of the delivery pipes 20 in most branches 32 in the fluid delivery system; the throttling structure 10 can optimize the aspect ratio of the delivery pipes 20 of each branch 32 without increasing the processing difficulty and cost, and adjust the flow resistance relationship and ratio of each branch 32, thereby significantly improving the reliability of the fluid delivery system and the rationality of the flow distribution.

[0055] See also Figure 4-6 As an optional embodiment of the present invention, the throttling structure 10 further includes a second throttling unit 2, and the second throttling unit 2 is arranged on a side of the hole distribution section 12 away from the inlet section 11;

[0056] The second throttling unit 2 includes a flow channel 22 connecting its two sides along the fluid conveying direction, the minimum flow cross-sectional area of ​​the flow channel 22 is greater than or equal to the minimum flow cross-sectional area of ​​the throttling channel 1211, and the flow channel 22 is connected to the first inner cavity 122 of the first throttling unit 1 through the throttling channel 1211.

[0057] It should be noted that the fluid delivery direction is also the axial direction of the inlet section 11 or the axial direction of the delivery pipe 20 or the axial direction of the second throttling unit 2. The second throttling unit 2 includes a flow channel 22 that connects both sides of itself along the fluid delivery direction. The flow channel 22 can be set at the center, non-center or edge of the second throttling unit 2. For example, the flow channel 22 is formed by the gap between the second throttling unit 2 and the delivery pipe 20. The second throttling unit 2 can be set to contact with the inner wall of the delivery pipe 20, or can be set not to contact with the inner wall of the delivery pipe 20. For example, when the second throttling unit 2 does not contact with the inner wall of the delivery pipe 20, the second throttling unit 2 is connected to the hole section 12 of the first throttling unit 1; whether there is a gap between the second throttling unit 2 and the hole section 12 can be set according to actual needs. When there is a gap between the second throttling unit 2 and the hole-laying section 12, the circulation channel 22 can be set at the center position of the second throttling unit 2; one or more circulation channels 22 can also be set, and the size of the circulation channel 22 can be consistent with the aperture of the throttling channel 1211, or can be larger than the aperture of the throttling channel 1211. The minimum circulation cross-sectional area of ​​a single circulation channel 22 is greater than or equal to the minimum circulation cross-sectional area of ​​a single throttling channel 1211. The minimum circulation cross-sectional area of ​​the circulation channel 22 is no longer limited by the size of the blockage, because the throttling channel 1211 has filtered the blockage in advance, and the aperture size of the circulation channel 22 can be set very small according to actual needs. For example, the aperture of the flow channel 22 of the perforated section 12 is greater than or equal to the aperture of the throttling channel 1211; more specifically, for example, when the channel is a circular hole, the minimum flow cross-sectional area = π × (aperture / 2)2; when the channel is a slit, the minimum flow cross-sectional area = slit width × slit depth, but the minimum flow cross-sectional area of ​​a single flow channel 22 is greater than or equal to the minimum flow cross-sectional area of ​​a single throttling channel 1211, and can be set specifically according to actual needs.

[0058] In the present case, when the flow rate is limited by the minimum flow cross-sectional area of ​​the flow channel 22 of the second throttling unit 2, the inner diameter cross-sectional area of ​​the inlet section 11 can be set as large as possible, and the flow cross-sectional area required for the inner diameter of the inlet section 11 will no longer be limited by the flow of the fluid in the corresponding delivery pipe 20. At this time, the inner diameter of the inlet section 11 does not have a throttling effect, and the throttling effect of the fluid in the delivery pipe 20 is achieved through the flow channel 22. The cooperation between the first throttling unit 1 and the second throttling unit 2 meets the flow requirements of the front and rear ends of the delivery pipe 20; the throttling structure 10 can optimize the aspect ratio of the delivery pipe 20 of each branch 32 without increasing the processing difficulty and cost, and adjust the flow resistance relationship and ratio between the branches 32, thereby significantly improving the reliability of the fluid delivery system and the rationality of flow distribution.

[0059] In the present case, the first throttling unit 1 can be of various structural forms such as tubular, plate, film, and slit types. Similarly, the second throttling unit 2 can also be of various shapes such as tubular, plate, film, slit, and block types. It should be understood that no matter what structural form the first throttling unit 1 and the second throttling unit 2 are, the materials used must meet the corresponding use environment. It should be understood that the circulation channel 22 and the throttling channel 1211 include but are not limited to physical paths such as through holes or gaps formed by mechanical processing, gaps generated by the cooperation of relatively moving parts, and laser-etched microstructures to realize the fluid throttling function; the first throttling unit 1 and the second throttling unit 2 can be connected as an integrated whole, and the two can also be split structures, or the first throttling unit 1 and the second throttling unit 2 are detachably connected structures; as shown in the figure, when the first throttling unit 1 and the second throttling unit 2 are split, they can be separated at the dividing line M; the throttling structure 10 can be provided with one or more first throttling units 1, and can also be provided with one or more second throttling units 2, and the specific design is based on actual needs; the first throttling unit 1 and the second throttling unit 2 can be sealed by setting a sealing ring to strengthen the sealing.

[0060] See also Figure 4-6 As an optional embodiment of the present case, the second throttling unit 2 includes a second sealing portion 21 that cooperates with the inner wall of the delivery pipe 20 , and the flow channel 22 is arranged in the annular area enclosed by the second sealing portion 21 .

[0061] It should be noted that when the circulation channel 22 is formed by the gap between the second throttling unit 2 and the inner wall of the delivery pipe 20, the second throttling unit 2 and the delivery pipe 20 are involved, which increases the difficulty and cost of processing the circulation channel 22 of a preset size. Therefore, in this case, the circulation channel 22 is arranged in the annular area enclosed by the second sealing portion 21, so that the processing of the circulation channel 22 of a predetermined size only involves the second throttling unit 2, thereby reducing the difficulty and cost of processing and improving the processing accuracy of the circulation channel 22. The second throttling unit 2 is located on the side of the hole section 12 away from the inlet section 11, and the second sealing portion 21 is generally located on the outer circumferential surface of the second throttling unit 2. The first sealing portion 111 is tightly matched with the end face or inner wall of the delivery pipe 20 to achieve a sealing effect. It should be understood that the fluid can enter from one end of the second throttling unit 2 and flow out from the other end. The second sealing portion 21 is to seal the gap between the delivery pipe 20 and the second throttling unit 2 to achieve a better throttling effect of the second throttling unit 2.

[0062] See also Figure 4-6As an optional embodiment of the present case, a gap area 13 is formed between the second sealing portion 21 and the first sealing portion 111; the throttling channel 1211 connects the gap area 13 and the first inner cavity 122 of the first throttling unit 1; the circulation channel 22 is connected to each of the throttling channels 1211 through the gap area 13.

[0063] It should be noted that, in the present case, the hole section 12 is located between the first sealing portion 111 and the second sealing portion 21, and the fluid first enters from the inlet section 11 of the first throttling unit 1, and then flows out to the inside of the delivery pipe 20 through the hole section 12, that is, enters the gap area 13 formed between the first sealing portion 111 and the second sealing portion 21; a plurality of throttling channels 1211 are provided in the hole section 12, and these throttling channels 1211 have a filtering effect on the fluid, and the fluid filtered by the hole section 12 flows to the second throttling unit 2 through the gap area 13; in the second throttling unit 2, the fluid is throttled through the circulation channel 22 to meet the flow requirements of the front and rear ends of the delivery pipe 20, and the aperture of the circulation channel 22 can be precisely adjusted according to the actual throttling requirements. Setting; since the aperture of the circulation channel 22 is relatively small, the length of the second throttling unit 2 can also be reduced accordingly, avoiding the problem of increased processing difficulty caused by an excessively large aspect ratio, thereby reducing the manufacturing cost and difficulty; in addition, since the minimum flow cross-sectional area of ​​the circulation channel 22 of the hole-laying section 12 is greater than or equal to the minimum flow cross-sectional area of ​​the throttling channel 1211, this hierarchical filtering mechanism effectively prevents the blockage of the circulation channel 22, and greatly reduces the possibility of blockage of the throttling structure 10 as a whole; the throttling structure 10 is able to achieve precise control of the flow distribution of each branch 32 without increasing the difficulty and cost of processing, while reducing the risk of contaminant blockage, providing a strong guarantee for the reliability of the fluid delivery system and flow regulation and distribution.

[0064] As an optional embodiment of the present case, the circulation channel 22 is a hole-like or slit-like structure for fluid circulation or a gap between two relatively moving parts, and / or the throttling channel 1211 is a hole-like or slit-like structure for fluid circulation or a gap between two relatively moving parts. The specific selection and design can be made according to actual needs and application environment requirements. In the present case, the circulation channel 22 and the throttling channel 1211 preferably have a hole-like structure.

[0065] As an optional embodiment of the present case, the first throttling unit 1 adopts a plate-like body structure, an axially penetrating hollow cavity is provided inside the plate-like body, a plurality of throttling channels 1211 are arranged on the plate-like body, and the throttling channels 1211 pass through one of the side areas of the plate-like body.

[0066] As an optional embodiment of the present case, the first throttling unit 1 is a bag-shaped body made of a flexible film material, and a plurality of throttling channels 1211 formed by stamping or laser processing are distributed on the surface of the bag-shaped body. The opening edge of the bag-shaped body is sealed to the inner wall of the conveying pipe 20 by heat welding or an elastic hoop.

[0067] As an optional embodiment of the present case, the first throttling unit 1 includes at least two groups of adjusting components that can move relative to each other, and a dynamic gap with a preset width is formed between the mating surfaces of the adjusting components, and the dynamic gap constitutes the throttling channel 1211, wherein the relative positions of the adjusting components can be continuously adjusted by an external driving mechanism, thereby changing the width of the dynamic gap to achieve adjustable throttling control.

[0068] As an optional embodiment of the present case, the second throttling unit 2 includes a tube body and a flow channel 22 connected to the inner cavity of the tube body.

[0069] As an optional embodiment of the present case, the second throttling unit 2 is a disc-shaped plate body, and a flow channel 22 is arranged on the plate body. For example, the central area of ​​the plate body is provided with a radially distributed flow channel 22, and the outlet end of the flow channel 22 is provided with a gradually expanding guide surface, and the inlet and outlet ends are provided with a gradually converging straightening surface.

[0070] As an optional embodiment of the present case, the second throttling unit 2 is made of a polymer film material, a flow channel 22 is provided on the surface of the film, and the edge of the film is sealed and connected to the inner wall of the delivery pipe 20.

[0071] As an optional embodiment of the present case, the second throttling unit 2 includes an inner core component and an outer tube component that are coaxially nested, and an annular gap is formed between the outer surface of the inner core component and the inner surface of the outer tube component, and the annular gap constitutes the flow channel 22, wherein the inner core component is provided with an axial adjustment mechanism to change its coaxiality with the outer tube component, thereby realizing dynamic control of the width of the annular gap.

[0072] See also Figure 6-7 As an optional embodiment of the present invention, along the radial direction of the inlet section 11, the hole distribution section 12 includes at least one first side area 121, and the first side area 121 and the outer wall of the first sealing portion 111 are spaced apart in the radial direction of the first throttling unit 1;

[0073] The throttling channel 1211 is at least arranged in the first side area 121 of the hole distribution section 12 , and the first side area 121 is a part formed by the gap area 13 .

[0074] It should be understood that the hole-laying section 12 has not only a first side area 121, but also a second side area, a third side area, etc. The first side area 121 can be a plane, a curved surface, or an irregular surface; the first side area 121 is a partial area or the entire area of ​​the outer side surface or the outer circumferential surface of the hole-laying section 12; therefore, the throttling channel 1211 can be arranged not only in the first side area 121, but also in other sides such as the second side area, the third side area, etc. according to actual needs. For example, the throttling channel 1211 can also be arranged near the first throttling unit 1 The end face of the second flow unit; by arranging the first side area 121 and the outer wall of the first sealing portion 111 in the radial direction of the first throttling unit 1 at intervals, the throttling channel 1211 can be arranged in the first side area 121, so that the fluid in the first inner cavity 122 of the hole-laying section 12 can flow out into the delivery pipe 20 through the throttling channel 1211, that is, it can smoothly enter the gap area 13 through the throttling channel 1211, and then flow out through the flow channel 22 of the second throttling unit 2, and throttling is realized, thereby realizing the reasonable distribution of the fluid flow.

[0075] See also Figure 6-8 As an optional embodiment of the present case, the throttling channels 1211 are at least arranged in an array in the first side area 121, and can also be arranged in an array on other sides such as the second side and the third side of the hole-laying section 12. By arranging a large number of throttling channels 1211, the anti-clogging ability of the throttling structure 10 is improved. When the fluid contains impurities, even if individual or several throttling channels 1211 are blocked, compared with the dozens or even hundreds of throttling channels 1211 that may exist in the entire structure, the impact of such blockage is extremely small and almost negligible, thereby ensuring the stability and reliability of the throttling structure 10 under complex working conditions.

[0076] See also Figure 4 or Figure 6 As an optional embodiment of the present case, the aperture of the throttling channel 1211 at one end of the first inner cavity 122 close to the first throttling unit 1 is less than or equal to the aperture of the throttling channel 1211 at one end of the first inner cavity 122 away from the first throttling unit 1, so that when the first throttling unit 1 is injection molded, the demolding operation can be performed more conveniently, and the resistance and difficulty during demolding can be effectively reduced, thereby improving production efficiency and product quality; the throttling channel 1211 can be spherical, truncated cone or semi-elliptical, and can be set according to actual needs.

[0077] As an optional embodiment of the present case, the maximum effective aperture of the throttling channel 1211 is less than or equal to 0.7 mm.

[0078] It should be noted that the maximum effective aperture refers to the minimum inner diameter of the conical throttling channel 1211 when the throttling channel 1211 is in a conical shape, that is, the maximum effective aperture of the throttling channel 1211 is less than or equal to 0.7㎜, which refers to the minimum inner diameter of the conical throttling channel 1211, and the maximum cannot exceed 0.7㎜; it should be understood that this does not limit the shape of the throttling channel 1211 to a conical hole, and the throttling channel 1211 can also be a straight hole. Based on an embodiment of the present case, the cleanliness requirements of the whole machine cooling circuit system generally constrain the maximum particle diameter and the maximum fiber length; in a typical oil-cooled electric drive system, the maximum value of the diameter of the above-mentioned polluted particles is generally between 0.6mm and 1mm, and the maximum value of the polluted fiber length is generally between 2mm and 3mm. The above-mentioned pollutants may exist in the circuit and block the circulation channel 22 of about 1mm. Therefore, the maximum effective aperture of the throttling channel 1211 can be set to be less than or equal to 0.7㎜; further, the maximum effective aperture of the throttling channel 1211 is less than or equal to 0.65㎜ or 0.6㎜ or 0.5㎜ or 0.4㎜. It should be understood that when the minimum value of the effective aperture of the circulation channel 22 increases, the effective aperture of the throttling channel 1211 can also be increased accordingly, and is not limited to 0.7㎜. The aperture of the throttling channel 1211 only needs to be less than or equal to the aperture of the circulation channel 22.

[0079] See also Figure 6 As an optional embodiment of the present case, the first throttling unit 1 and the second throttling unit 2 are integrally formed injection molded parts, that is, the throttling structure 10 can be a single injection molded part and can be injection molded in one go, with low production cost. When the throttling structure 10 is used in a high temperature environment, the material of the throttling structure 10 can be a resin such as polyamide, polyoxymethylene, polyphenylene sulfide, etc. that is resistant to high temperatures and has good compatibility with oil. It should be understood that the throttling structure 10 of the present case can also be a combination of other metal / non-metal parts formed by machining, stamping, etc.

[0080] See also Figure 4 , the present invention also provides a pipeline, including a delivery pipe 20 and a throttling structure 10 installed in the delivery pipe 20;

[0081] The first sealing portion 111 and the second sealing portion 21 of the throttling structure 10 are configured to form a seal or an integral connection with the delivery pipe 20. It should be understood that the throttling structure 10 can be arranged on the inner side of a single oil channel pipeline and installed in an embedded manner, or at the junction of the oil channels of adjacent devices or components, and installed in pairs in a manner of one end embedded and the other end exposed. The latter installation method can save the trouble of installing the corresponding limiting structure 201 when embedded, and reduce the difficulty of subsequent replacement; in addition, the delivery pipe 20 and the throttling structure 10 installed in the delivery pipe 20 can also be integrally connected or integrally formed or fixedly connected.

[0082] See also Figure 4 As an optional embodiment of the present case, at least the first sealing portion 111 and the second sealing portion 21 of the throttling structure 10 and the portion therebetween are located inside the delivery pipe 20. It should be understood that the other portion of the first sealing portion 111 of the throttling structure 10 away from the second sealing portion 21 may be outside the delivery pipe 20 or inside the delivery pipe 20; the other portion of the second sealing portion 21 of the throttling structure 10 away from the first sealing portion 111 may be outside the delivery pipe 20 or inside the delivery pipe 20.

[0083] As an optional embodiment of the present case, the first sealing portion 111 and / or the second sealing portion 21 is sealed by interference fit with the inner wall of the delivery pipe 20, or is sealed by contact with the end face of the delivery pipe 20, or is sealed and connected to the delivery pipe 20 via a sealing ring.

[0084] As an optional embodiment of the present case, the length and aperture ratio of the delivery pipe 20 is less than or equal to 4.

[0085] It should be noted that, compared with directly adjusting the size of the cast or machined pipeline, the pipeline using the throttling structure 10 of the present case can increase the required inner diameter of the pipeline while achieving the same pressure drop. For example, the original inner diameter of the pipeline can be expanded from 6mm to 8mm to 12mm to 15mm, and the aspect ratio is reduced from greater than 10 to no more than 4, which better solves the difficulty of casting and machining and reduces costs.

[0086] See also Figure 4As an optional embodiment of the present case, the pipeline further includes a limiting structure 201 for limiting the movement of the first throttling unit 1 and / or the second throttling unit 2 relative to the delivery pipe 20. It should be noted that the limiting structure 201 can be provided on the delivery pipe 20, or on the first throttling unit 1, or on the second throttling unit 2, or the limiting structure 201 can be detachably connected to the delivery pipe 20 or the throttling structure 10, as long as the throttling structure 10 can be limited. Generally, the limiting structure 201 is provided on the first throttling unit 1 away from the second throttling unit 2, so as to facilitate the limited installation with the end of the delivery pipe 20, thereby improving the convenience of installation.

[0087] Furthermore, the pipeline is a casting or a machined part.

[0088] Furthermore, the cross section of the first throttling unit 1 and / or the second throttling unit 2 is circular, square or other shapes, as long as it can match the pipeline.

[0089] See also Figure 4 The present invention provides a fluid delivery system, including the above-mentioned pipeline. The fluid delivery system can be applied to lubrication systems, heat dissipation systems, fuel supply systems, cooling water circulation systems, air conditioning and heating systems, etc. The specific system can be selected according to actual use requirements. For example, when the fluid delivery system is applied to a drive assembly, the drive assembly includes a motor and a reducer. The fluid delivery system can simultaneously play the role of heat dissipation and lubrication, and can solve the problem of flow distribution requirements.

[0090] See also Figure 1 , 3 Or 4, the present invention provides a drive assembly, including a delivery unit, a filter unit, a reducer and a motor connected in sequence through a main pipeline; at least the reducer and the motor are provided with the pipeline, and the pipeline is connected to the main pipeline. It should be noted that the delivery unit can be an oil pump, a gear pump, a rotor pump, etc.; the filter unit can be a filter, a filter, etc.; a heat exchanger can also be provided between the reducer and the motor. The pipeline includes a first branch and a second branch, one end of the first branch is connected to the main pipeline, and the other end leads to the part of the reducer that needs to be cooled; one end of the second pipeline is connected to the main pipeline, and the other end leads to the part of the motor that needs to be cooled.

[0091] In this case, the throttling structure 10 is used to be installed in the delivery pipe 20, and the flow distribution requirements of the flow in the delivery pipe 20 are met through the filtering of the first throttling unit 1 and the flow limiting of the second throttling unit 2. The hole section 12 of the first throttling unit 1 is provided with a plurality of small throttling channels 1211, which have the function of filtering impurities. Compared with the traditional reduction throttling, it avoids the failure risk caused by the blockage of a single small oil hole by impurities and pollutants in the oil circuit, thereby improving the overall robustness of the system; the fluid enters the gap area 13 after being filtered, and the fluid in the gap area 13 converges at the flow channel 22 of the second throttling unit 2, and the flow is accurately controlled through the flow channel 22 to meet the front and rear end requirements, thereby ensuring that the throttling structure 10 can achieve accurate flow distribution and low blockage risk without increasing the processing difficulty and cost, thereby improving the reliability of the fluid control pipeline or system; and when the flow distribution requirements are met, the number of throttling channels 1211 of the hole section 12 is reduced, which can also enable the first throttling unit 1 to have a throttling operation, thereby realizing the throttling structure 10 with multiple throttling effects; at the same time, due to the setting of the throttling structure 10, the inner diameter design of the delivery pipe 20 is increased and the aspect ratio is reduced, thereby effectively reducing the manufacturing cost of the delivery pipe 20 and reducing or avoiding blockage of the delivery pipe 20. In summary, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

[0092] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A throttling structure, characterized in that: Used for installation in a delivery pipe, the throttling structure comprises a first throttling unit; The first throttling unit includes an inlet section and a hole distribution section connected to the inlet section. The inlet section includes a first sealing portion that cooperates with the wall of the delivery pipe; at least part of the area of ​​the hole section is provided with a plurality of throttling channels; the hole section extends along the delivery direction of the fluid in the corresponding delivery pipe or the axial direction of the inlet section.

2. The throttling structure according to claim 1, characterized in that: The throttling structure further includes a second throttling unit, which is arranged on a side of the hole distribution section away from the inlet section; The second throttling unit includes a flow channel connecting its two sides along the fluid conveying direction, the minimum flow cross-sectional area of ​​the flow channel is greater than or equal to the minimum flow cross-sectional area of ​​the throttling channel, and the flow channel is connected to the first inner cavity of the first throttling unit through the throttling channel.

3. The throttling structure according to claim 1, characterized in that: The second throttling unit includes a second sealing portion that matches the inner wall of the delivery pipe, and the flow channel is arranged in an annular area surrounded by the second sealing portion.

4. The throttling structure according to claim 2, characterized in that: A gap area is formed between the second sealing part and the first sealing part; the throttling channel communicates with the gap area and the first inner cavity of the first throttling unit; and the circulation channel communicates with each of the throttling channels through the gap area.

5. The throttling structure according to claim 4, characterized in that: Along the radial direction of the inlet section, the hole distribution section includes at least one first side area, and the first side area and the outer wall of the first sealing portion are spaced apart in the radial direction of the first throttling unit; The throttling channel is at least arranged in a first side area of ​​the hole distribution section, and the first side area is a part formed by the gap area.

6. The throttling structure according to claim 3, characterized in that: The flow channel is a hole-like or slit-like structure for fluid flow or a gap between two relatively movable parts, and / or the throttling channel is a hole-like or slit-like structure for fluid flow or a gap between two relatively movable parts.

7. The throttling structure according to claim 5, characterized in that: The throttling channels are at least arranged in an array in the first side area.

8. The throttling structure according to claim 6, characterized in that: The aperture of the throttling channel at one end close to the first inner cavity of the first throttling unit is smaller than or equal to the aperture of the throttling channel at one end away from the first inner cavity of the first throttling unit.

9. The throttling structure according to claim 1, characterized in that: The maximum effective aperture of the throttling channel is less than or equal to 0.7 mm.

10. The throttling structure according to claim 2, characterized in that: The first throttling unit and the second throttling unit are integrally formed injection molded parts.

11. A pipeline, characterized in that: It comprises a delivery pipe and a throttling structure according to any one of claims 1 to 10 installed in the delivery pipe; At least the first sealing portion of the throttling structure is configured to be able to form a seal or be integrally connected with the delivery pipe.

12. The pipeline according to claim 11, characterized in that At least the first throttling unit of the throttling structure is located in the delivery pipe.

13. The pipeline according to claim 11, characterized in that The first sealing portion and / or the second sealing portion is sealed by interference fit with the inner wall of the delivery pipe, or is sealed by contact with the end surface of the delivery pipe, or is sealed and connected to the delivery pipe via a sealing ring.

14. The pipeline according to claim 11, characterized in that The length and aperture ratio of the delivery pipe is less than or equal to 4.

15. The pipeline according to claim 11, characterized in that It also includes a limiting structure for limiting the movement of the first throttling unit and / or the second throttling unit relative to the delivery pipe.

16. A fluid delivery system, characterized in that: Comprising the pipeline described in any one of claims 11-15.

17. A drive assembly, characterized in that: It comprises a conveying unit, a filtering unit, a reducer and a motor which are sequentially connected via a main pipeline; at least the reducer and the motor are provided with the pipeline according to any one of claims 11 to 15, and the pipeline is connected with the main pipeline.

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