A throttle structure, pipeline, fluid delivery system and drive assembly

Abstract

The present application relates to the technical field of fluid delivery, in particular to a throttling structure, a pipeline, a fluid delivery system and a driving assembly; the throttling structure is used for being installed in a delivery pipe, the throttling structure comprises a first throttling unit; the first throttling unit comprises an inlet section and a hole arranging section in communication with the inlet section, the inlet section comprises a first sealing part matched with the pipe wall of the delivery pipe; at least part of the hole arranging section is provided with a plurality of throttling channels; the hole arranging section is arranged in extension along the delivery direction of the fluid in the corresponding delivery pipe or the axial direction of the inlet section; the throttling structure of the present application can effectively realize the throttling, pressure division and flow distribution of the fluid in at least part of the branch of the fluid delivery system without increasing the processing difficulty and cost, and can reduce the risk of contamination blockage.

Description

Technical Field

[0001] This invention relates to the field of fluid transport technology, specifically to a throttling structure, pipeline, fluid transport system, and drive assembly. Background Technology

[0002] The vehicle-mounted drive motor and its control system achieve shared cooling circuits for the motor and reducer through integrated design. The cooling circuit adopts a series-parallel topology, and the flow resistance relationship is changed by adjusting the inner diameter of the passage to regulate the flow of each branch, thereby improving system efficiency. However, this design faces problems such as unreasonable flow distribution, processing capacity limitations, and contaminant blockage. Summary of the Invention

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

[0004] To achieve the above and other related objectives, the present invention provides a throttling structure for installation in a delivery pipe, the throttling structure comprising:

[0005] The first throttling unit includes an inlet section and a perforation section communicating with the inlet section;

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

[0007] In one embodiment of the present invention, the throttling structure further includes a second throttling unit, which is disposed on the side of the perforation section away from the inlet section;

[0008] The second throttling unit includes a flow channel connecting its two sides along the fluid transport 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. The flow channel is connected to the first inner cavity of the first throttling unit through the throttling channel.

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

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

[0011] As one embodiment of the present invention, along the radial direction of the inlet section, the perforated section includes at least a first side surface region, and the first side surface region and the outer wall of the first sealing part are spaced apart in the radial direction of the first throttling unit.

[0012] The throttling channel is at least located in the first side region of the perforated section, and the first side region is part of the gap region.

[0013] In one embodiment of the present invention, the flow channel is a perforated or slit-like structure for fluid flow or a gap between two relatively movable parts, and / or the throttling channel is a perforated or slit-like structure for fluid flow or a gap between two relatively movable parts.

[0014] In one embodiment of the present invention, the throttling channels are at least arrayed in the first side region.

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

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

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

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

[0019] At least the first sealing part of the throttling structure is configured to form a seal or integral connection with the delivery pipe.

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

[0021] In one embodiment of the present invention, the first sealing part and / or the second sealing part are sealed by interference fit with the inner wall of the conveying pipe, or by contact with the end face of the conveying pipe, or by sealing connection with the conveying pipe through a sealing ring.

[0022] In one embodiment of the present invention, the length-to-diameter ratio of the conveying pipe is less than or equal to 4.

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

[0024] To achieve the above and other related objectives, the present invention provides a fluid transport system, including the aforementioned pipeline.

[0025] To achieve the above and other related objectives, the present invention provides a drive assembly comprising a conveying unit, a filtering unit, a reducer, and a motor connected sequentially via 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 this invention, when the flow rate of the fluid in the delivery pipe is not limited, or when the minimum flow cross-sectional area required to limit 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 when the inner diameter cross-sectional area of ​​the inlet section can be set according to actual needs to the flow cross-sectional area required to limit the flow rate of the fluid in the corresponding delivery pipe, and the minimum inner diameter of the inlet section allows all blockages to pass through, since the perforated section extends along the delivery direction of the fluid in the corresponding delivery pipe or the axial direction of the inlet section, the perforated section of the first throttling unit is equipped with as many throttling channels as possible. The throttling channels can be set in the perforated section. The end face and side face are designed so that even if a small number of throttling channels become blocked after long-term use of the throttling structure, the sum of the minimum flow cross-sectional areas of all remaining usable throttling channels can still be greater than or equal to the cross-sectional area of ​​the inner diameter of the inlet section. This ensures that the system flow demand is not affected, thus meeting the flow demand at both ends of the delivery pipe. Furthermore, these throttling channels not only change the flow resistance to achieve pressure division, but also have a filtering function, effectively reducing the risk of contaminant blockage. The inner diameter area of ​​the inlet section is set to the flow cross-sectional area required for the flow limit of the fluid in the corresponding delivery pipe, thereby achieving the throttling effect on the delivery pipe. In this case, since the inner diameter cross-sectional area of ​​the inlet section can be set according to actual needs to the flow cross-sectional area required for the flow rate limit of the fluid in the corresponding delivery pipe, 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 an excessively large length-to-diameter ratio, thereby reducing manufacturing costs and difficulties; the combined use of multiple throttling structures can achieve precise distribution and control of the flow rate of at least most branches in the fluid delivery system; this allows the throttling structure to optimize the length-to-diameter ratio of the delivery pipes of each branch and adjust the flow resistance relationship and ratio of each branch without increasing processing difficulty and cost, thereby significantly improving the reliability of the fluid delivery system and the rationality of flow distribution. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the shared cooling circuit for the reducer and motor involved in the present invention.

[0029] Figure 2 This is a schematic diagram of one of the topologies in the prior art that regulates flow by reducing the inner diameter of the pipe, where multiple circles represent nozzle locations;

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

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

[0032] Figure 5 This is a schematic diagram of fluid flow in a throttling structure according to an embodiment of the present invention;

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

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

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

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

[0037] Figure 10 for Figure 9 BB structure sectional view;

[0038] Component labeling description: Throttling structure 10, delivery pipe 20, limiting structure 201, first throttling unit 1, inlet section 11, first sealing part 111, perforated section 12, first side area 121, throttling channel 1211, first inner cavity 122, gap area 13, second throttling unit 2, second sealing part 21, flow channel 22, main road 31, branch road 32, nozzle position 33. Detailed Implementation

[0039] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0040] Please see Figures 1 to 10 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0041] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0042] Please see Figure 1-2 The vehicle-mounted drive motor and its control system include motor and reducer components. To achieve integration, lightweighting, and miniaturization, the cooling circuits of the reducer and drive motor can be shared, and reducer lubricating oil can be used to provide cooling and lubrication for the motor's heat-generating components (such as the motor stator and rotor) and transmission components (such as bearings); for example... Figure 1 The image shows one type of oil circuit topology for an integrated oil-cooled electric drive.

[0043] In the above design, the cooling circuit includes several series trunk lines and parallel branches, each pointing to different components or nodes that require lubrication and heat dissipation; the combined flow rate of each trunk line and branch line is equivalent to the discharge flow rate of the oil pump, which can be adjusted by the speed of the oil pump. For example... Figure 1 This demonstrates a possible topology for the series and parallel connections between nodes. Here, topology refers to the connection methods and arrangements between nodes in the cooling circuit.

[0044] In the above design, the lubrication flow requirement of each branch node is determined by its respective load. For example, for bearings, this includes angular velocity, axial force, and radial force; for gear shafts, it includes slippage and normal force; for motor stator, it includes line current amplitude; and for motor rotor, it includes iron loss. The general method to achieve these flow requirements is to adjust the pipe diameter of the main and branch lines to change the pressure drop along the path of each branch, thereby changing the flow resistance relationship and ratio between branches, thus affecting the distribution of the overall flow of the oil pump among the branches. The pipes of the main and branch lines are generally formed by casting, stamping, and / or machining, such as... Figure 2 An integrated oil-cooled electric drive system is shown, including a main path 31, a branch path 32, and a nozzle position 33.

[0045] Please see Figure 1-2 The main bottleneck of the above implementation method is:

[0046] First, due to topology limitations, the oil is supplied from the reducer end, meaning the main circuit starts at the gear shaft side and ends at the motor side. The overall back pressure of the system is higher at the reducer side than at the motor side. This results in a higher flow rate at the front end (reducer side) than at the rear end (motor side) for nozzles / pipes of the same size. Generally, the cooling flow rate required at the rear end of the oil circuit (motor stator and rotor) is much greater than that at the front end (reducer side). Therefore, the design requires increasing the flow resistance at the front end to increase the distribution at the rear end. Consequently, the diameter of the front-end pipes and nozzles needs to be reduced.

[0047] Second, the adjustment of branch diameter is limited by processing and forming capabilities, resulting in a relatively narrow range of variation. For metal parts, the minimum diameter of cast deep tubes is not less than 6 mm to 8 mm, and the length-to-diameter ratio is generally no more than 10 times (and decreases as the diameter decreases); for nozzles formed by machining, the minimum diameter is generally not less than 1 mm, and the length-to-diameter ratio is generally no more than 3 times. These processing capacity bottlenecks may conflict with the aforementioned requirement to "reduce front-end distribution". Overcoming these processing capacity bottlenecks will result in increased part processing difficulty, shorter tool wear-out cycles, and increased costs.

[0048] Third, the cleanliness requirements of the overall cooling circuit system generally constrain the maximum particle diameter and maximum fiber length. In a typical oil-cooled electric drive system, the maximum diameter of these contaminant particles is generally between 0.6 mm and 1 mm, and the maximum length of the contaminant fibers is generally between 2 mm and 3 mm. These contaminants may exist in the circuit, clogging pipes and nozzles with a diameter of about 1 mm. This bottleneck in cleanliness may conflict with the aforementioned requirement to "reduce the pipe diameter to adjust the distribution between the front and rear ends." Overcoming this bottleneck will lead to increased system cleanliness requirements, increased difficulty in processing and protecting all oil-contaminated components during transportation, and ultimately 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. Optimizing the flow distribution between the front and rear ends requires adjusting the front-end flow resistance, but this is limited by processing and forming capabilities. Secondly, there are limitations on the minimum diameter and aspect ratio of metal parts, and reducing the diameter increases processing difficulty and cost. Finally, system cleanliness requirements limit particle diameter and fiber length to prevent clogging of small-diameter pipes, which also increases protection difficulty and cost. These factors collectively influence the design of the cooling circuit, requiring a balance to be found between flow distribution, processing capabilities, and cleanliness.

[0050] To address the aforementioned problems, this invention patent describes a throttling structure 10 that directly achieves flow resistance control / flow regulation without excessively stringent control over machining and casting dimensions, while simultaneously avoiding 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 from any field, such as the mechanical, medical, chemical, power, construction, and agricultural fields.

[0051] Please see Figure 3 Alternatively, 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, which includes an inlet section 11 and a perforated section 12 communicating with the inlet section 11. The inlet section 11 includes a first sealing part 111 that cooperates with the wall of the delivery pipe 20. At least a portion of the perforated section 12 is provided with a plurality of throttling channels 1211. The perforated 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.

[0052] It should be noted that the first throttling unit 1 includes at least an inlet section 11 and a perforated section 12, which are connected. The first sealing part 111 is generally located at the end of the inlet section 11 away from the perforated section 12 or on the outer circumferential surface of the inlet section 11. The first sealing part 111 is in close contact with the end face or inner wall of the conveying pipe 20 to achieve a sealing effect. It should be understood that fluid can enter from the inlet section 11 of the first throttling unit 1 and then flow out from the perforated section 12. The first sealing part 111 is used to seal the gap between the conveying pipe 20 and the first throttling unit 1, so that the fluid flows into the conveying pipe 20 and is then throttled and filtered by the first throttling unit 1. The outer contour of the perforated section 12 and the conveying pipe 20 may be provided with a gap. The gap allows fluid within the perforated section 12 to flow into the delivery pipe 20, or along the setting direction of the perforated section 12, the outer contour projection of the perforated section 12 is at least partially located within the enclosed area of ​​the outer contour projection of the first sealing part 111, so that fluid within the perforated section 12 can flow into the delivery pipe 20 through the throttling channels 1211 on the end face and / or side wall of the perforated section 12. Combined with the longer perforated section 12, the number of throttling channels 1211 can be increased. For example, the throttling channels 1211 can be set on the end face and side of the perforated section 12, thereby increasing the sum of the minimum flow cross-sectional areas of all throttling channels 1211 and making it greater than or equal to the minimum flow cross-sectional area required for throttling of the delivery pipe 20.

[0053] In this case, the throttling structure 10 is installed inside the delivery pipe 20 to optimize the distribution of fluid flow. The fluid can be a coolant for cooling, an oil for lubrication, or water for other purposes. The fluid first enters from the inlet section 11 of the first throttling unit 1, and then flows out through the perforated section 12 into the delivery pipe 20. The perforated section 12 is provided with multiple throttling channels 1211, which filter 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), this case can effectively reduce the risk of blockage and failure of the perforated section 12 by setting a large number of throttling channels 1211. When there is no limit to the flow rate of the fluid in the delivery pipe 20, or when the inner diameter limiting the flow rate 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 perforated 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 actual size of the filter material to achieve at least filtering most or all of the filter material. Since the perforated section 12 extends along the corresponding delivery direction of the fluid in the delivery pipe 20 or the axial direction of the inlet section 11, the length of the perforated section 12 can be set according to actual needs to achieve as many throttling channels 1211 as possible. Thus, within the service life of the throttling structure 10, after the throttling structure 10 has been used for a long time and some throttling channels 1211 are blocked, the sum of the minimum flow cross-sectional areas of all 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 meet the usage requirements.

[0054] In this case, when the flow rate of the fluid in the delivery pipe 20 is not limited, or when the minimum flow cross-sectional area required to limit 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 when the inner diameter cross-sectional area of ​​the inlet section 11 can be set according to actual needs to the flow cross-sectional area required to limit the flow rate of the fluid in the delivery pipe 20, and when the minimum inner diameter of the inlet section 11 allows all blockages to pass through, since the perforated 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 perforated section 12 of the first throttling unit 1 is equipped with as many throttling channels 1211 as possible. The throttling channels 1211 can be set in the perforated section 12. The end face and side face of 2 are designed so that even if a small number of throttling channels 1211 are blocked after long-term use of the throttling structure 10, the sum of the minimum flow cross-sectional areas of all 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 and thus meeting the flow demand of the front and rear ends of the delivery pipe 20. In addition, these throttling channels 1211 can not only change the flow resistance to achieve pressure division, but also have a filtration function, effectively reducing the risk of contaminant blockage. The inner diameter area of ​​the inlet section 11 is set to the flow cross-sectional area required for the flow limit of the fluid in the delivery pipe 20, so that the throttling effect of the delivery pipe 20 can be achieved. In this case, since the inner diameter cross-sectional area of ​​the inlet section 11 can be set according to actual needs to the flow cross-sectional area required for the flow restriction of the fluid in the corresponding conveying pipe 20, and the inner diameter of the inlet section 11 is 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 length-to-diameter ratio, thereby reducing manufacturing costs and difficulties; enabling the throttling structure 10 of this case to achieve precise control of the flow distribution of the conveying pipe 20 in most branches 32 of the fluid conveying system; enabling the throttling structure 10 to optimize the length-to-diameter ratio of the conveying pipe 20 of each branch 32 and adjust the flow resistance relationship and ratio of each branch 32 without increasing processing difficulty and cost, thereby significantly improving the reliability of the fluid conveying system and the rationality of flow distribution.

[0055] Please see Figure 4-6 As an optional embodiment of this case, the throttling structure 10 further includes a second throttling unit 2, which is disposed on the side of the perforation section 12 away from the inlet section 11;

[0056] The second throttling unit 2 includes a flow channel 22 that connects both sides of itself along the fluid transport 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. 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 either the axial direction of the inlet section 11, 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 connecting its two sides along the fluid delivery direction. This flow channel 22 can be located 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 configured to contact the inner wall of the delivery pipe 20 or not. For example, when the second throttling unit 2 does not contact the inner wall of the delivery pipe 20, it is connected to the perforated section 12 of the first throttling unit 1. Whether there is a gap between the second throttling unit 2 and the perforated section 12 can be set according to actual needs. When there is a gap between the second throttling unit 2 and the perforated section 12, the flow channel 22 can be set at the center of the second throttling unit 2; one or more flow channels 22 can also be set, and the size of the flow channel 22 can be the same as or larger than the orifice of the throttling channel 1211. 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. The minimum flow cross-sectional area of ​​the flow channel 22 is no longer limited by the size of the blockage, because the blockage has been filtered in advance by the throttling channel 1211. The orifice size of the flow channel 22 can be set very small according to actual needs. For example, the diameter of the flow channel 22 of the perforated section 12 is greater than or equal to the diameter of the throttling channel 1211; more specifically, for example, when the channel is a round hole, the minimum flow cross-sectional area = π × (hole diameter / 2)2; when the channel is a gap, the minimum flow cross-sectional area = gap width × gap 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, which can be set according to actual needs.

[0058] In this 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. The required flow cross-sectional area of ​​the inner diameter of the inlet section 11 will no longer be limited by the flow rate of the fluid in the corresponding conveying pipe 20. At this time, the inner diameter of the inlet section 11 does not have a throttling effect. The throttling effect of the fluid in the conveying pipe 20 is achieved through the flow channel 22. The cooperation between the first throttling unit 1 and the second throttling unit 2 satisfies the flow requirements of the front and rear ends of the conveying pipe 20. This allows the throttling structure 10 to optimize the length-to-diameter ratio of the conveying pipe 20 of each branch 32 and adjust the flow resistance relationship and ratio between each branch 32 without increasing the processing difficulty and cost, thereby significantly improving the reliability of the fluid conveying system and the rationality of the flow distribution.

[0059] In this case, the first throttling unit 1 can be in various structural forms such as tubular, plate, membrane, and slotted. Similarly, the second throttling unit 2 can also be in various shapes such as tubular, plate, membrane, slotted, and block. It should be understood that regardless of the structural form of the first throttling unit 1 and the second throttling unit 2, the materials used must meet the corresponding usage environment. It should be understood that the flow channel 22 and the throttling channel 1211 include, but are not limited to, through holes or gaps formed by machining, gaps generated by the cooperation of relatively moving parts, and physical paths for achieving fluid throttling function, such as laser-etched microstructures; the first throttling unit 1 and the second throttling unit 2 can be connected as a whole, or they can be a separate structure, or the first throttling unit 1 and the second throttling unit 2 can be detachably connected; as shown in the figure, when the first throttling unit 1 and the second throttling unit 2 are separate, they can be separated at the dividing line M; the throttling structure 10 can be provided with one or more first throttling units 1, or one or more second throttling units 2, depending on the actual needs of the design; the first throttling unit 1 and the second throttling unit 2 can be sealed by setting a sealing ring.

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

[0061] It should be noted that when the flow channel 22 is formed by the gap between the second throttling unit 2 and the inner wall of the conveying pipe 20, the processing difficulty and cost of the flow channel 22 of the preset size are increased because it involves two components: the second throttling unit 2 and the conveying pipe 20. Therefore, this invention sets the flow channel 22 within the annular area enclosed by the second sealing part 21, so that the processing of the flow channel 22 of the preset size only involves the second throttling unit 2, thereby reducing the processing difficulty and cost and improving the processing accuracy of the flow channel 22. The second throttling unit 2 is located on the side of the perforated section 12 away from the inlet section 11. The second sealing part 21 is generally located on the outer circumferential surface of the second throttling unit 2. The first sealing part 111 is tightly fitted with the end face or inner wall of the conveying pipe 20 to achieve a sealing effect. It should be understood that fluid can enter from one end of the second throttling unit 2 and flow out from the other end. The second sealing part 21 is to seal the gap between the conveying pipe 20 and the second throttling unit 2 to achieve a better throttling effect of the second throttling unit 2.

[0062] Please see Figure 4-6As an optional embodiment of this case, a gap region 13 is formed between the second sealing part 21 and the first sealing part 111; the throttling channel 1211 connects the gap region 13 and the first inner cavity 122 of the first throttling unit 1; the flow channel 22 is connected to each of the throttling channels 1211 through the gap region 13.

[0063] It should be noted that, in this case, the perforated section 12 is located between the first sealing part 111 and the second sealing part 21. The fluid first enters from the inlet section 11 of the first throttling unit 1, and then flows out through the perforated section 12 into the interior of the delivery pipe 20, that is, into the gap region 13 formed between the first sealing part 111 and the second sealing part 21. The perforated section 12 is provided with multiple throttling channels 1211, which have the function of filtering the fluid. The fluid filtered by the perforated section 12 flows through the gap region 13 to the second throttling unit 2. In the second throttling unit 2, the fluid is throttled through the flow channel 22 to meet the flow requirements of the front and rear ends of the delivery pipe 20. The orifice diameter of the flow channel 22 can be precisely adjusted according to the actual throttling requirements. The design incorporates several features. Because the orifice diameter of the flow channel 22 is relatively small, the length of the second throttling unit 2 can be reduced accordingly, avoiding the increased processing difficulty caused by an excessively large length-to-diameter ratio, thus reducing manufacturing costs and complexity. Furthermore, since the minimum flow cross-sectional area of ​​the flow channel 22 in the perforated section 12 is greater than or equal to the minimum flow cross-sectional area of ​​the throttling channel 1211, this hierarchical filtration mechanism effectively prevents blockage of the flow channel 22, significantly reducing the likelihood of blockage of the throttling structure 10 as a whole. This allows the throttling structure 10 to achieve precise control of the flow distribution in each branch 32 without increasing processing difficulty and cost, while also reducing the risk of contaminant blockage, providing strong assurance for the reliability and flow regulation of the fluid transport system.

[0064] As an optional embodiment of this case, the flow channel 22 is a perforated or slit-like structure for fluid flow or a gap between two relatively moving parts, and / or the throttling channel 1211 is a perforated or slit-like structure for fluid flow or a gap between two relatively moving parts. The specific design can be selected according to actual needs and application environment requirements. In this case, the flow channel 22 and the throttling channel 1211 are preferably perforated structures.

[0065] As an optional embodiment of this case, the first throttling unit 1 adopts a plate-shaped body structure. The plate-shaped body has an axially penetrating hollow cavity inside. Multiple throttling channels 1211 are arranged on the plate-shaped body, and the throttling channels 1211 penetrate one side area of ​​the plate-shaped body.

[0066] As an optional embodiment of this case, the first throttling unit 1 is a bag-shaped body made of flexible thin film material. The surface of the bag-shaped body is distributed with multiple throttling channels 1211 formed by stamping or laser processing. The opening edge of the bag-shaped body is sealed to the inner wall of the delivery pipe 20 by heat fusion or elastic ring.

[0067] As an optional embodiment of this case, the first throttling unit 1 includes at least two sets of relatively movable adjusting components. A dynamic gap with a preset width is formed between the mating surfaces of the adjusting components. The dynamic gap constitutes the throttling channel 1211. The relative position 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 this case, the second throttling unit 2 includes a section of pipe and a flow channel 22 that connects to the inner cavity of the pipe.

[0069] As an optional embodiment of this case, the second throttling unit 2 is a disc-shaped plate with a flow channel 22. For example, the central area of ​​the plate has radially distributed flow channels 22, and the outlet end of the flow channel 22 has a gradually expanding guide surface, and the inlet and outlet ends have a gradually contracting rectification surface.

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

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

[0072] Please see Figure 6-7 As an optional embodiment of this case, along the radial direction of the inlet section 11, the perforated section 12 includes at least a first side area 121, and the first side area 121 and the outer wall of the first sealing part 111 are spaced apart in the radial direction of the first throttling unit 1.

[0073] The throttling channel 1211 is at least disposed in the first side region 121 of the perforated section 12, and the first side region 121 is part of the gap region 13.

[0074] It should be understood that the perforated section 12 not only has a first side surface region 121, but may also have a second side surface region, a third side surface region, etc. The first side surface region 121 can be a plane, a curved surface, or an irregular surface; the first side surface region 121 is a partial or complete area of ​​the outer side surface or outer circumferential surface of the perforated section 12; therefore, the throttling channel 1211 can not only be set in the first side surface region 121, but can also be set in other sides such as the second side and the third side according to actual needs. For example, the throttling channel 1211 can also be set near the first throttling unit 1. The end face of the second flow unit; by setting the first side area 121 and the outer wall of the first sealing part 111 at a distance in the radial direction of the first throttling unit 1, 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 perforated section 12 can flow out to the delivery pipe 20 through the throttling channel 1211, that is, 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, thereby achieving throttling and thus achieving reasonable distribution of fluid flow.

[0075] Please see Figure 6-8 As an optional embodiment of this case, the throttling channels 1211 are at least arrayed in the first side region 121, and can also be arrayed in other sides such as the second side and third side of the perforated section 12. By setting a large number of throttling channels 1211, the aim is to improve the anti-clogging ability of the throttling structure 10. When the fluid contains impurities, even if one or a few throttling channels 1211 are blocked, the impact of such blockage is extremely small compared to the dozens or even hundreds of throttling channels 1211 that may exist in the entire structure. It can be almost ignored, thereby ensuring the stability and reliability of the throttling structure 10 under complex working conditions.

[0076] Please see Figure 4 or Figure 6 As an optional embodiment of this case, the diameter of the throttling channel 1211 at the end near the first inner cavity 122 of the first throttling unit 1 is less than or equal to the diameter of the end of the throttling channel 1211 away from the first inner cavity 122 of the first throttling unit 1. This allows for easier demolding during injection molding of the first throttling unit 1, effectively reducing resistance and difficulty during demolding, thereby improving production efficiency and product quality. The throttling channel 1211 can be spherical, frustum-shaped, or semi-elliptical, and can be specifically set according to actual needs.

[0077] As an optional embodiment of this 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 orifice diameter refers to the minimum inner diameter of the conical throttling channel 1211 when the throttling channel 1211 is conical. That is, the maximum effective orifice diameter of the throttling channel 1211 is less than or equal to 0.7 mm, which means the minimum inner diameter of the conical throttling channel 1211, and the maximum cannot exceed 0.7 mm. It should be understood that this does not limit the shape of the throttling channel 1211 to a conical orifice; the throttling channel 1211 can also be a straight orifice. In one embodiment of this case, the cleanliness requirements of the overall machine cooling circuit system generally constrain the maximum particle diameter and maximum fiber length. In a typical oil-cooled electric drive system, the maximum diameter of the aforementioned contaminant particles is generally between 0.6 mm and 1 mm, and the maximum length of the contaminant fibers is generally between 2 mm and 3 mm. These contaminants may exist in the circuit, blocking the flow channel 22 by about 1 mm. Therefore, the maximum effective aperture of the throttling channel 1211 can be set to be less than or equal to 0.7 mm. Furthermore, the maximum effective aperture of the throttling channel 1211 is less than or equal to 0.65 mm, 0.6 mm, 0.5 mm, or 0.4 mm. It should be understood that when the minimum effective aperture of the flow channel 22 increases, the effective aperture of the throttling channel 1211 can also be increased accordingly, and is not limited to 0.7 mm. The aperture of the throttling channel 1211 only needs to be less than or equal to the aperture of the flow channel 22.

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

[0080] Please see 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 part 111 and the second sealing part 21 of the throttling structure 10 are configured to form a seal or integral connection with the delivery pipe 20. It should be understood that the throttling structure 10 can be disposed inside a single oil passage and installed in an embedded manner, or at the junction of oil passages of adjacent devices or components, and installed in a paired manner with one end embedded and the other end exposed. The latter installation method can eliminate the trouble of needing a corresponding installation 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, integrally formed, or fixedly connected.

[0082] Please see Figure 4 As an optional embodiment of this case, at least the first sealing portion 111 and the second sealing portion 21, and the portion between them, of the throttling structure 10 are located inside the conveying pipe 20. It should be understood that other portions of the first sealing portion 111 of the throttling structure 10 on the side away from the second sealing portion 21 may be outside or inside the conveying pipe 20; other portions of the second sealing portion 21 of the throttling structure 10 on the side away from the first sealing portion 111 may be outside or inside the conveying pipe 20.

[0083] As an optional embodiment of this case, the first sealing part 111 and / or the second sealing part 21 are sealed by interference fit with the inner wall of the conveying pipe 20, or by contact with the end face of the conveying pipe 20, or by sealing connection with the conveying pipe 20 through a sealing ring.

[0084] As an optional embodiment of this case, the length-to-diameter ratio of the conveying pipe 20 is less than or equal to 4.

[0085] It should be noted that, compared with directly adjusting the size of cast or machined pipes, the pipes using the throttling structure 10 of this case can increase the required pipe inner diameter while achieving the same pressure drop. For example, the original pipe inner diameter can be increased from 6mm to 8mm to 12mm to 15mm, and the length-to-diameter ratio can be reduced from more than 10 to no more than 4. This effectively solves the difficulties of casting and machining and reduces costs.

[0086] Please see Figure 4As an optional embodiment of this case, the pipeline further includes a limiting structure 201 that restricts 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 disposed on the delivery pipe 20, on the first throttling unit 1, or on the second throttling unit 2. Alternatively, the limiting structure 201 can be detachably connected to the delivery pipe 20 or the throttling structure 10, as long as it can limit the throttling structure 10. Generally, the limiting structure 201 is disposed on the first throttling unit 1 away from the second throttling unit 2, thereby facilitating installation with the end of the delivery pipe 20 and improving installation convenience.

[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 they can be matched with the pipeline.

[0089] Please see Figure 4 This invention provides a fluid delivery system, including the aforementioned pipeline. The fluid delivery system can be applied to lubrication systems, heat dissipation systems, fuel supply systems, cooling water circulation systems, and air conditioning and heating systems, etc. The specific application can be selected according to actual usage requirements. For example, when the fluid delivery system is applied to a drive assembly, which includes a motor and a reducer, the fluid delivery system can simultaneously serve as a heat dissipation and lubrication system, and can solve the problem of flow distribution requirements.

[0090] Please see Figure 1 , 3 Alternatively, the present invention provides a drive assembly comprising a conveying unit, a filtering unit, a reducer, and a motor sequentially connected by 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 conveying unit can be an oil pump, a gear pump, a rotor pump, etc.; the filtering unit can be a filter screen, 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 being connected to the main pipeline and the other end being connected to a part of the reducer that requires cooling; one end of the second pipeline being connected to the main pipeline and the other end being connected to a part of the motor that requires cooling.

[0091] In this case, the throttling structure 10 is installed inside the delivery pipe 20, and the flow distribution requirements of the delivery pipe 20 are met by the filtration of the first throttling unit 1 and the flow restriction of the second throttling unit 2. The perforated section 12 of the first throttling unit 1 is equipped with multiple small throttling channels 1211, which filter impurities. Compared with traditional diameter reduction throttling, it avoids the failure risk caused by the blockage of a single small oil hole by oil passage impurities and contaminants, and improves the overall robustness of the system. After filtration, the fluid enters the gap area 13. The fluid in the gap area 13 converges at the flow channel 22 of the second throttling unit 2 and the flow rate is precisely controlled through the flow channel 22 to meet the needs of the front and back ends. This ensures that the throttling structure 10 achieves accurate flow distribution and low blockage risk without increasing processing difficulty and cost, and improves the reliability of the fluid control pipeline or system. Furthermore, when the flow distribution requirements are met, reducing the number of throttling channels 1211 in the perforated section 12 can also enable the first throttling unit 1 to perform throttling, thereby achieving the effect of multiple throttling of the throttling structure 10. At the same time, due to the setting of the throttling structure 10, the inner diameter of the conveying pipe 20 is increased and the length-to-diameter ratio is reduced, thereby effectively reducing the manufacturing cost of the conveying pipe 20 and reducing or avoiding blockage of the conveying pipe 20. In summary, the present invention effectively overcomes some practical problems in the prior art, thus having high utilization value and significance.

[0092] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A throttling structure, characterized in that, For installation in a delivery pipe, the throttling structure includes a first throttling unit; The first throttling unit includes an inlet section and an orifice section communicating with the inlet section. The inlet section includes a first sealing part that mates with the wall of the delivery pipe; at least a portion of the perforated section is provided with multiple throttling channels; the perforated section extends along the delivery direction of the fluid in the corresponding delivery pipe or along the axial direction of the inlet section. The throttling structure further includes a second throttling unit, which is disposed on the side of the perforation section away from the inlet section; The second throttling unit includes a flow channel connecting its two sides along the fluid transport 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. The flow channel is connected to the first inner cavity of the first throttling unit through the throttling channel.

2. The throttling structure according to claim 1, characterized in that, The second throttling unit includes a second sealing part that mates with the inner wall of the delivery pipe, and the flow channel is disposed within the annular area enclosed by the second sealing part.

3. The throttling structure according to claim 2, characterized in that, A gap region is formed between the second sealing part and the first sealing part; the throttling channel connects the gap region and the first inner cavity of the first throttling unit; the flow channel connects to each of the throttling channels through the gap region.

4. The throttling structure according to claim 3, characterized in that, Along the radial direction of the inlet section, the perforated section includes at least one first side surface region, which is spaced apart from the outer wall of the first sealing part in the radial direction of the first throttling unit; The throttling channel is at least located in the first side region of the perforated section, and the first side region is part of the gap region.

5. The throttling structure according to claim 2, characterized in that, The flow channel is a perforated or slit-like structure for fluid flow or a gap between two relatively movable parts, and / or the throttling channel is a perforated or slit-like structure for fluid flow or a gap between two relatively movable parts.

6. The throttling structure according to claim 4, characterized in that, The throttling channels are at least arrayed in the first side region.

7. The throttling structure according to claim 5, characterized in that, The diameter of the throttling channel at the end closest to the first inner cavity of the first throttling unit is less than or equal to the diameter of the throttling channel at the end furthest from the first inner cavity of the first throttling unit.

8. 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.

9. The throttling structure according to claim 1, characterized in that, The first throttling unit and the second throttling unit are integrally molded injection parts.

10. A pipeline, characterized in that, Includes a delivery pipe and a throttling structure as described in any one of claims 2-9 installed in the delivery pipe; At least the first sealing part of the throttling structure is configured to form a seal or integral connection with the delivery pipe.

11. The pipeline according to claim 10, characterized in that, At least the first throttling unit of the throttling structure is located inside the delivery pipe.

12. The pipeline according to claim 10, characterized in that, The first sealing part and / or the second sealing part are sealed by interference fit with the inner wall of the conveying pipe, or by contact with the end face of the conveying pipe, or by sealing connection with the conveying pipe through a sealing ring.

13. The pipeline according to claim 10, characterized in that, The length-to-diameter ratio of the delivery pipe is less than or equal to 4.

14. The pipeline according to claim 10, characterized in that, It also includes a limiting structure that restricts the movement of the first throttling unit and / or the second throttling unit relative to the delivery pipe.

15. A fluid transport system, characterized in that, Includes the pipeline as described in any one of claims 10-14.

16. A drive assembly, characterized in that, It includes a conveying unit, a filtering unit, a reducer, and a motor that are sequentially connected by a main pipeline; at least the reducer and the motor are provided with the pipeline as described in any one of claims 10-14, and the pipeline is connected to the main pipeline.

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