Intercooling air inlet pipe and V-shaped diesel engine

Abstract

The invention provides an intercooling air inlet pipe and a V-shaped diesel engine, and relates to the technical field of diesel engine structures. A pipe body of the intercooling air inlet pipe comprises a plurality of rigid pipe fittings and connecting assemblies connected between every two adjacent rigid pipe fittings, each connecting assembly comprises a rubber pipe sleeve and a fixing hoop, and each rubber pipe sleeve is provided with a first matching section, a large-diameter section and a second matching section which are sequentially connected; the inner diameter of the large-diameter section is larger than the inner diameter of the first matching section and the inner diameter of the second matching section. The first matching section and the second matching section are arranged on the two adjacent rigid pipe fittings in a sleeving mode correspondingly, and the first matching section and the second matching section are fastened with the rigid pipe fittings through fixing hoops. A gap is formed between every two adjacent rigid pipe bodies, the gaps are wrapped and sealed through the large-diameter sections, the gaps can meet the requirements of relative displacement, thermal expansion and the like during vibration, and the installation size of the gaps is far smaller than that of corrugated pipes in the prior art, so that the installation space can be shortened, and the height can be reduced easily.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine structures, and in particular to an intercooler intake pipe and a V-type diesel engine. Background Art

[0002] The turbocharger system uses the exhaust gas from the engine to drive the turbine end to rotate, which drives the coaxial compressor to rotate and pressurize the air. The compressed gas is cooled by the intercooler and sent to the cylinder to increase the engine power. The intercooler intake pipe is a pipe that sends the gas compressed by the supercharger to the intercooler for cooling. The supercharger shaft needs to be in a horizontal position and should not be subjected to external forces from the pipe connection. If the pipeline is not fixed, the load on the supercharger will increase. In addition, when the pipeline vibrates too much, it is easy to cause the connection between the pipelines to fail, and there is a risk of air leakage.

[0003] At present, the air intake temperature before intercooling of high-boosted and high-power diesel engines is close to 300°C. The intake pipe is usually made of cast iron, and a complex pipe system is arranged with multiple bellows to absorb the vibration transmitted from the turbocharger to the intake pipe and the expansion of the pipe caused by the high-temperature gas after compression. However, in the structure connected by bellows, the supercharging system occupies a large space, and in order to meet the layout requirements, it is often installed and arranged by increasing the occupied height space, especially for multi-cylinder diesel engines, the height of the diesel engine is relatively high. Summary of the invention

[0004] The object of the present invention is to provide an intercooler intake pipe and a V-type diesel engine, which can help reduce the space occupied by the supercharging system in a high-power diesel engine.

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

[0006] An intercooler intake pipe, used for a high-power engine; the intercooler intake pipe comprises a pipe body, the pipe body comprises an intake joint and an outlet joint, the intake joint is used to connect to a supercharger, the outlet joint is used to connect to the intercooler, so as to deliver compressed gas supercharged by the supercharger to the intercooler; the pipe body further comprises a plurality of rigid pipes and a connecting assembly connected between two adjacent rigid pipes, one of the rigid pipes comprises the intake joint, and another of the rigid pipes comprises the outlet joint;

[0007] The connecting assembly includes a rubber sleeve and a fixing clamp, the rubber sleeve has a first fitting section, a large diameter section and a second fitting section which are connected in sequence, the inner diameter of the large diameter section is larger than the inner diameter of the first fitting section and the second fitting section; the first fitting section and the second fitting section are respectively sleeved on two adjacent rigid pipe fittings, and the first fitting section and the second fitting section are fastened to the rigid pipe fitting by the fixing clamp; there is a gap between two adjacent rigid pipe fittings, and the large diameter section covers the gap.

[0008] Optionally, one end of the rigid pipe fitting has a connecting portion, which is matingly connected to the first mating segment or the second mating segment; the connecting portion includes an end face ring flange arranged at the end of the rigid pipe fitting, the end face ring flange is located in the large diameter segment, and the outer wall of the end face ring flange is spaced apart from the inner wall of the large diameter segment.

[0009] Optionally, a gap size between an outer wall of the end face ring flange and an inner wall of the large diameter section is S, 6mm≤S≤8mm.

[0010] Optionally, the protrusion height of the end face ring flange is H, 2.3mm≤H≤2.8mm.

[0011] Optionally, the connecting portion further comprises a sealing ring flange spaced apart from the end face ring flange, grooves are provided in the first mating section and the second mating section, and the sealing ring protrusion is embedded and mated in the grooves.

[0012] Optionally, the sealing ring flange is a raised structure with a semicircular cross-section, and the radius of the sealing ring flange is R, 2.3mm≤R≤2.8mm.

[0013] Optionally, the fixing clamp is located between the end face ring flange of the connecting portion and the sealing ring flange.

[0014] Optionally, the rigid pipe fitting is connected to the rubber sleeve by interference fit, and the interference between the rigid pipe fitting and the rubber sleeve is calculated by the following formula:

[0015]

[0016] Among them, △ is the interference, unit is mm; P is the design sealing pressure, unit is MPa; Douter, dinner and δ are the outer diameter, inner diameter and thickness of the rubber casing, unit is mm; ρ is the rubber density, unit is g / cm 3 ; σ is the rubber rebound rate, unit is %; L is the length of the rigid pipe fitting inserted into the rubber sleeve, unit is mm; D is the diameter of the rigid pipe fitting.

[0017] Optionally, the pipe body has a first air inlet joint and a second air inlet joint, and the first air inlet joint and the second air inlet joint are respectively used to connect to the supercharger; the rigid pipe fitting includes a first curved pipe section, a second curved pipe section and an intermediate pipe section, one end of the first curved pipe section forms the first air inlet joint, and the other end of the first curved pipe section is connected to the intermediate pipe section through the connecting assembly; one end of the second curved pipe section forms the second air inlet joint, and the other end of the second curved pipe section is connected to the intermediate pipe section through the connecting assembly.

[0018] Optionally, the middle pipe section has a concave structure so that the two ends of the middle pipe section are at different heights;

[0019] The intercooler intake pipe also includes a bracket assembly, one end of which is fixedly connected to the mounting base of the middle pipe section; the other end of the bracket assembly is used to be connected to the cylinder head.

[0020] Optionally, the lower side of the middle pipe section is used to form a space for accommodating the inlet and return pipes of the intercooler; the intercooler intake pipe also includes a bracket assembly, and the bracket assembly includes a support, a first pipe clamp, a second pipe clamp, a third pipe clamp and a rubber tube jacket; the first pipe clamp and the second pipe clamp are spliced ​​to form a first clamping hole for clamping the middle pipe section, and the second pipe clamp and the third pipe clamp are spliced ​​to form a second clamping hole for clamping the inlet and return pipes, and the rubber tube jacket is provided in the first clamping hole and the second clamping hole; the support is fixedly connected to the third pipe clamp, and the support is used to connect to the cylinder head.

[0021] Optionally, the rubber tube sleeve includes a silicone rubber layer, an aramid cloth layer and a Nomex coating, the aramid cloth layer is coated on the outside of the silicone rubber layer, and the Nomex coating is coated on the outside of the silicone rubber layer.

[0022] Optionally, the rigid pipe is made of aluminum alloy.

[0023] A V-type diesel engine comprises a diesel engine body and the above-mentioned intercooler intake pipe, wherein the intercooler intake pipe is arranged in the V-shaped space of the diesel engine body.

[0024] The intercooler intake pipe and V-type diesel engine provided by the embodiments of the present invention have the following beneficial effects:

[0025] An embodiment of the present invention provides an intercooler air intake pipe, which has a pipe body, and the pipe body has an air intake joint and an air outlet joint, wherein the air intake joint is used to connect to a supercharger, and the air outlet joint is used to connect to an intercooler, so as to deliver the compressed gas supercharged by the supercharger to the intercooler. At the same time, the pipe body also includes a plurality of rigid pipes and a connecting assembly connected between two adjacent rigid pipes, wherein one rigid pipe has an air intake joint, and the other rigid pipe has an air outlet joint. The connecting assembly includes a rubber sleeve and a fixing clamp, and the rubber sleeve has a first matching section, a large diameter section and a second matching section connected in sequence, and the inner diameter of the large diameter section is larger than the inner diameter of the first matching section and the second matching section; the first matching section and the second matching section are respectively sleeved on two adjacent rigid pipes, and the first matching section and the second matching section are fastened to the rigid pipe by a fixing clamp. There is a gap between two adjacent rigid pipe bodies, and the gap is closed by covering the large diameter section. The gap can ensure that the relative displacement requirements during vibration and thermal expansion requirements are met. It is much smaller than the installation size of the bellows in the prior art, so the installation space can be shortened and it helps to reduce the height.

[0026] An embodiment of the present invention further provides a V-type diesel engine, which includes the above-mentioned intercooler intake pipe, and thus has the beneficial effect of shortening the gap between the two rigid pipes, thereby shortening the installation space and helping to reduce the height. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0028] Figure 1 A schematic structural diagram of a supercharging system in a V-type diesel engine according to one aspect of the present invention is shown;

[0029] Figure 2 A schematic structural diagram of a first intercooler intake pipe provided according to one aspect of the present invention is shown;

[0030] Figure 3 A schematic structural diagram of a second intercooler intake pipe provided according to one aspect of the present invention is shown;

[0031] Figure 4 A schematic cross-sectional structure diagram of a connection assembly in an intercooler intake pipe according to one aspect of the present invention is shown;

[0032] Figure 5 A schematic structural diagram of a rubber sleeve in an intercooler intake pipe according to one aspect of the present invention is shown;

[0033] Figure 6A schematic structural diagram of a connection portion of a rigid pipe in an intercooler intake pipe according to one aspect of the present invention is shown;

[0034] Figure 7 A schematic cross-sectional structure diagram of a rubber bushing provided according to one aspect of the present invention is shown;

[0035] Figure 8 A schematic diagram of an exploded structure of a bracket assembly at a second intercooler intake pipe provided according to one aspect of the present invention is shown;

[0036] Fig. 9 The supporting structure at the first intercooler intake pipe provided according to one aspect of the present invention is shown;

[0037] Fig.10 Shows Fig. 9 Schematic diagram of the cross-sectional structure at BB in the middle;

[0038] Fig.11 The height from the outlet of the supercharger to the inlet of the air cooler provided in accordance with one aspect of the present invention is shown;

[0039] Fig.12 The height from the outlet of the supercharger to the inlet of the air cooler when a conventional bellows connection is adopted according to one aspect of the present invention is shown.

[0040] Reference numerals:

[0041] 100-intercooler intake pipe; 111-first intercooler intake pipe; 112-second intercooler intake pipe; 113-first elbow section; 114-first intake joint; 115-second elbow section; 116-second intake joint; 117-first intermediate section; 118-second intermediate section; 119-third intermediate section; 121-exhaust joint; 122-connecting part; 123-end face ring flange; 124-sealing ring flange; 125-gap; 126-mounting base; 127-rigid pipe fitting; 130-connecting assembly; 131 - rubber sleeve; 132- first matching section; 133- large diameter section; 134- second matching section; 135- groove; 136- silicone rubber layer; 137- aramid cloth layer; 138- Nomex coating; 139- fixing clamp; 140- bracket assembly; 141- first pipe clamp; 142- second pipe clamp; 143- third pipe clamp; 144- first clamping hole; 145- second clamping hole; 146- rubber pipe jacket; 147- support member; 148- support frame; 149- first connecting bolt; 150- second connecting bolt;

[0042] 211-supercharger; 212-intercooler; 213-water inlet pipe; 214-water return pipe; 215-cylinder head. DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0044] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", "vertical" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] At the same time, it should be noted that the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, an integral connection, or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or the internal communication of two components, etc. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Figure 1 The schematic diagram of the structure of the supercharging system in a V-type diesel engine provided in this embodiment is as follows: Figure 2 This is a schematic diagram of the structure of the first intercooler intake pipe 111 provided in this embodiment, Figure 3 This is a schematic diagram of the structure of the second intercooler intake pipe 112 provided in this embodiment. Figure 1-Figure 3 This embodiment provides an intercooler intake pipe 100 and also provides a V-type diesel engine (not shown).

[0048] The V-type diesel engine includes a diesel engine body and a supercharging system. The supercharging system includes an intercooler 212, a supercharger 211, and an intercooler intake pipe 100. The intake joint of the intercooler intake pipe 100 is connected to the supercharger 211, and the outlet joint 121 of the intercooler intake pipe 100 is connected to the intercooler 212, so that the compressed gas obtained after supercharging by the supercharger 211 is delivered to the intercooler 212 for cooling. In this embodiment, the V-type diesel engine has two rows of superchargers 211, namely, the A row superchargers 211 and the B row superchargers 211. Accordingly, the supercharging system has two intercooler intake pipes 100, which are respectively a first intercooler intake pipe 111 and a second intercooler intake pipe 112. The first intercooler intake pipe 111 is connected to the A row superchargers 211, and the second intercooler intake pipe 112 is connected to the B row superchargers 211.

[0049] In the present embodiment, since the diesel engine body is the main part of a V-type diesel engine, a V-shaped space is formed between the two rows of cylinders of the diesel engine body, and the supercharging system is located in the V-shaped space. In other words, in the present embodiment, the supercharger 211 adopts a top fixing method, which helps to meet the intake needs, reduce the upper space occupancy, reduce the stress on the exhaust pipe, prevent the exhaust pipe bolts from being broken due to stress, and is conducive to the arrangement of the exhaust pipe and the heat insulation coating of the supercharger 211.

[0050] Specifically, in the V-type diesel engine, the intercooler 212 is a single-stage air cooler, which is arranged at the flywheel end. At the same time, the single-stage air cooler adopts a cooling scheme of a single-side water inlet pipe 213 and a return pipe 214, and the water inlet pipe 213 and the return pipe 214 are arranged in the B row of the V-type oil production machine, located below the second intercooler intake pipe 112.

[0051] The structures of the first intercooler intake pipe 111 and the second intercooler intake pipe 112 are substantially the same, and the similarities will not be described repeatedly below, and the differences will be described separately. In other words, the parts that are not described separately can be regarded as the first intercooler intake pipe 111 and the second intercooler intake pipe 112 having the same structure.

[0052] Figure 4 The cross-sectional structure diagram of the connection assembly 130 in the intercooler intake pipe 100 provided in this embodiment is shown. At the same time, the connection structure between each adjacent two rigid pipe members 127 in this embodiment is as shown in FIG. Figure 4 Please refer to Figure 1-Figure 4 In this embodiment, the pipe body of the intercooler intake pipe 100 includes a plurality of rigid pipes 127 and a connecting assembly 130 connected between two adjacent rigid pipes 127. The connecting assembly 130 connects the channels in the plurality of rigid pipes 127 to form a channel for the compressed gas to flow to the intercooler 212. One of the rigid pipes 127 has an intake connector, and another rigid pipe 127 has an outlet connector 121.

[0053] The connection assembly 130 includes a rubber sleeve 131 and a fixing clamp 139. Two adjacent rigid pipes 127 have a gap 125. The two ends of the rubber sleeve 131 are respectively connected to the two adjacent rigid pipes 127, and the sleeves are fixed by fixing clamps 139. The interval between the two adjacent rigid pipes 127 is sufficient to meet the relative displacement requirements during vibration and thermal expansion requirements, which is much smaller than the installation size of the bellows in the prior art. Specifically, the interval between the two adjacent rigid pipes 127 is greater than the vibration amplitude of the supercharger 211, the maximum thermal compensation amount of the intake pipe, and the cumulative value of the processing and installation tolerances. The rubber sleeve 131 is used between the two rigid pipes to achieve vibration displacement and thermal compensation in the axial and lateral directions of the pipeline, which has the same effect as the bellows, but the installation size is smaller than the bellows and the weight is much smaller than the stainless steel metal bellows.

[0054] Optionally, the fixing clamp 139 can be a band clamp, whose band is not perforated and whose edge is rolled up, so that the rubber tube sleeve will not be damaged during connection. Specifically, a single-ear stepless clamp, a toothed steel belt worm gear clamp, etc. can be selected.

[0055] Optionally, in this embodiment, the V-type diesel engine is a 300-ton heavy-duty open-pit mining truck engine. During the development of the V-type diesel engine, the cold front intake temperature is lower than 250°C, and the rigid pipe 127 in the intercooler intake pipe 100 is made of aluminum alloy material, which helps to meet the lightweight requirements. At the same time, in order to ensure the pipeline sealing, the rigid pipe 127 has high processing accuracy and the outer diameter dimension tolerance is not greater than + / -0.1mm. Optionally, the material of the rigid pipe 127 is high-temperature cast aluminum material ZL108-T6, and the mass fraction of its main elements is Si: 11.0% to 13.0%; Cu: 1.0% to 2.0%; Mg: 0.4% to 1.0%; Mn: 0.3% to 0.9%. The tensile strength of the ZL108 material at a high temperature of 300°C drops to 35.5% at room temperature. Compared with the tensile strength of 255MPa at room temperature, at 300°C, the tensile strength is ≥90.4MPa. The alloy has high room temperature and high temperature mechanical properties, low density, good heat resistance, excellent casting process performance, and no tendency to thermal cracking. The maximum axial thermal compensation is calculated to be 2.2 mm. Considering vibration, processing and installation deviations, the gap 125 between two adjacent rigid pipes 127 is designed to be 10 mm. It can be understood that the gap 125 can also be specifically set according to needs, for example, slightly deviating from 10 mm.

[0056] Figure 5 The schematic diagram of the structure of the rubber sleeve 131 in the intercooler intake pipe 100 provided in this embodiment is shown. Figure 1-Figure 5In this embodiment, the rubber sleeve 131 has a first matching section 132, a large diameter section 133 and a second matching section 134 which are connected in sequence. The first matching section 132 and the second matching section 134 are respectively sleeved on two adjacent rigid pipes 127, so as to connect the two rigid pipes 127. The inner diameter of the large diameter section 133 is larger than the inner diameter of the first matching section 132 and the second matching section 134. In other words, the large diameter section 133 can be regarded as a convex hull structure in the middle of the rubber sleeve 131, and the convex hull structure covers and closes the gap 125 between the two adjacent rigid pipes 127.

[0057] The rubber sleeve 131 and the rigid pipe 127 are interference fit, and the depth of the rigid pipe 127 inserted into the rubber sleeve 131 is not less than 50 mm. The interference between the rubber sleeve 131 and the rigid pipe 127 is closely related to the size and wall thickness of the rubber sleeve 131. The larger the size or the thicker the wall, the greater the interference should be. At the same time, the fixing clamp 139 provides safety guarantee. The interference calculation formula is as follows:

[0058]

[0059] Wherein, △ is the interference, unit is mm; P is the design sealing pressure, unit is MPa; Douter, dinner and δ are the outer diameter, inner diameter and thickness of the rubber sleeve 131, unit is mm; ρ is the rubber density, unit is g / cm 3 ; σ is the rubber rebound rate, unit %; L is the length of the rigid pipe 127 inserted into the rubber sleeve 131, unit mm; D is the diameter of the rigid pipe 127. Among them, the pressure is confirmed by parameters such as air intake volume and boost ratio during the design of the whole machine. After the rubber is selected, the rubber density and rubber rebound rate are determined. It should be noted that in the above formula, the outer diameter, inner diameter and thickness of the rubber sleeve 131 all adopt the dimensions of the first matching section 132 and the second matching section 134.

[0060] Thus, taking the diameter D of the rigid pipe 127 as 100mm, the length L of the rigid pipe 127 inserted into the rubber sleeve 131 as 50mm, and the thickness δ as 5mm as an example, when the pressure P, the rubber density ρ and the rubber rebound rate σ are determined, and Douter=dinner+2δ, the interference amount △ can be estimated by the above formula. For example, the solution method is adopted: the above formula is simplified into a quadratic equation about the interference amount, and two solutions can be obtained by solving the quadratic equation, 129.9 and 1.094. As for the interference amount, 129.9mm obviously does not meet the requirements, and 1.094mm is selected. The interference amount can be rounded to 1mm as the interference amount, and then the inner diameter size of the rubber sleeve 131 can be selected as 102mm, and the outer diameter size can be selected as 112mm.

[0061] Figure 6The schematic diagram of the structure of the connection part 122 of the rigid pipe 127 in the intercooler intake pipe 100 provided in this embodiment is shown. Figure 1-Figure 6 In this embodiment, the rigid pipe 127 has a connecting portion 122 for connecting with the rubber sleeve 131. In other words, the portion of the rigid pipe 127 that matches with the first matching section 132 or the second matching section 134 is the connecting portion 122. The connecting portion 122 includes an end face ring flange 123, which is located in the large diameter section 133, and the outer wall of the end face ring flange 123 is spaced from the outer wall of the large diameter section 133. In this way, the rubber sleeve 131 still has sufficient bending performance to meet the use requirements under the internal pressure, thermal expansion of the rigid pipe 127 and installation deviation.

[0062] Optionally, the gap size S between the outer wall of the end face ring flange 123 and the inner wall of the large diameter section 133 is 6mm≤S≤8mm. In this embodiment, the gap size S is 7mm, and it can be understood that in other embodiments, it can also be set to other sizes, such as 6mm or 8mm.

[0063] Optionally, the end face ring flange 123 is a rectangular protrusion, and preferably, its protrusion height is H, 2.3mm≤H≤2.8mm. Specifically, in the present embodiment, H is set to 2.5mm. It is understandable that in other embodiments, the protrusion height H can also be set according to requirements, for example, to 2.3mm or 2.8mm. Further, the end face ring flange 123 is provided with an end face chamfer, and optionally, the radius of the end face chamfer is 2mm, and the chamfer plays a guiding role in installation to avoid scratching the rubber sleeve 131. Optionally, in the present embodiment, the width D of the end face ring flange 123 is set to 10mm. It is understandable that in some other embodiments, the width D of the end face ring flange 123 can also be adjusted according to requirements.

[0064] Furthermore, the connection portion 122 also includes a sealing ring flange 124 spaced apart from the end face ring flange 123. When connected, the fixing clamp 139 is located between the sealing ring flange 124 and the end face ring flange 123. The two flanges cooperate with the fixing clamp 139 outside the rubber sleeve 131 to achieve sealing and anti-slip effects, and the maximum pressure drop in the pipeline after sealing is ≤0.07 kPa. During installation, the rubber sleeve 131 passes over the end face ring flange 123 and can be installed manually without preheating. At the same time, a groove 135 is also provided in the first matching section 132 and the second matching section 134, and the sealing ring protrusion is embedded and matched in the groove 135 to enhance the sealing effect.

[0065] Optionally, the sealing ring flange 124 is a convex structure with a semicircular cross section, and the radius of the sealing ring flange 124 is R, 2.3mm≤R≤2.8mm. Specifically, in this embodiment, R is set to 2.5mm. It can be understood that in some other embodiments, the radius of the sealing ring flange 124 can also be set according to requirements, for example, to 2.3mm or 2.8mm. Accordingly, in this embodiment, the groove 135 at the first matching section 132 and the second matching section 134 is set to a semicircular arc groove, and the size radius of the semicircular arc groove can be set to 2.6mm.

[0066] Figure 7 This is a schematic diagram of the cross-sectional structure of the rubber sleeve 131 provided in this embodiment. Figure 7 In this embodiment, the rubber sleeve 131 includes a silicone rubber layer 136, an aramid cloth layer 137 and a Nomex coating 138, the aramid cloth layer 137 is coated on the outside of the silicone rubber layer 136, and the Nomex coating 138 is coated on the outside of the silicone rubber layer 136. In this embodiment, the lowest temperature of the use environment of the V-type diesel engine is -40°C. After the air is compressed by the supercharger 211, the working pressure range in the intake pipe is a positive pressure of 1 to 3.5 Bar (absolute pressure), and the maximum working temperature is close to 245°C. Because the intake pressure reaches 3 Bar, the rubber sleeve 131 needs to have a reinforced structure. The rubber sleeve 131 in this embodiment is reinforced by the aramid cloth layer 137, and the inner rubber is made of silicone rubber, with a Shore hardness of 60±5HA, a material tensile strength ≥5MPa, and an elongation at break ≥200%. The Nomex coating 138 of high-performance polymer material is used in the silicone rubber layer 136, which has the characteristics of high fire resistance, high temperature resistance, and non-flammability. The rubber sleeve 131 has a design pressure of 4 Bar, a design working temperature of -40 to +288°C, and a service life of 3 years. Therefore, there is no need to set a steel wire in the rubber sleeve 131, thus avoiding the risk of the steel wire entering the cylinder after aging and breaking.

[0067] like Figure 1 As shown, in this embodiment, the supercharging system of the V-type diesel engine adopts a top-fixed manner of four superchargers 211 to meet the intake needs. The four superchargers 211 include two A-row superchargers 211 and two B-row superchargers 211. The air is compressed by the two superchargers 211 (A1, A2) in the A-row and enters the first intercooler intake pipe 111, and enters the intercooler 212 through the first intercooler intake pipe 111; at the same time, the air compressed by the two superchargers 211 (B1, B2) in the B-row enters the second intercooler intake pipe 112, and enters the intercooler 212 through the second intercooler intake pipe 112. The two rows of air enter the two sides of the upper box of the intercooler 212 respectively, are evenly mixed, cooled in the intercooler 212, and enter the cylinder through the air main pipe to participate in combustion and work.

[0068] Therefore, correspondingly, the first intercooler intake pipe 111 and the second intercooler intake pipe 112 are respectively provided with two intake joints. Specifically, the pipe body has a first intake joint 114 and a second intake joint 116, and the first intake joint 114 and the second intake joint 116 are respectively used to connect with the supercharger 211. The rigid pipe 127 includes a first curved pipe section 113, a second curved pipe section 115 and an intermediate pipe section, one end of the first curved pipe section 113 forms the first intake joint 114, and the other end of the first curved pipe section 113 is connected to the intermediate pipe section through a connecting assembly 130. One end of the second curved pipe section 115 forms the second intake joint 116, and the other end of the second curved pipe section 115 is connected to the intermediate pipe section through a connecting assembly 130.

[0069] The first curved pipe section 113 and the second curved pipe section 115 are both arc-shaped pipe sections bent at a certain angle, one end of which forms an air inlet joint, and the other end has a connecting portion 122, and the connection with the intermediate pipe section is achieved by matching the rubber sleeve 131 on the connecting portion 122. Specifically, in this embodiment, the intermediate pipe section includes a first intermediate pipe section 117, a second intermediate pipe section 118 and a third intermediate pipe section 119, the first intermediate pipe section 117 is connected to the first curved pipe section 113 through a connecting assembly 130, the other end of the second intermediate pipe section 118 is connected to the second intermediate pipe section 118 through a connecting assembly 130, and the other end of the second intermediate pipe section 118 is connected to the third intermediate pipe section 119 through a connecting assembly 130. The third intermediate pipe section 119 is a three-way pipe, another pipe opening of which is connected to the second curved pipe section 115 through a connecting assembly 130, and the remaining pipe opening forms an air outlet joint 121 connected to the intercooler 212.

[0070] It should be noted that the composition of the intermediate pipe segment is not limited here. It can be understood that in some other embodiments, the number of the intermediate pipe segments can also be specifically set according to needs.

[0071] Figure 8 This is a schematic diagram of the exploded structure of the bracket assembly 140 at the second intercooler intake pipe 112 provided in this embodiment. Figure 1-Figure 8 In this embodiment, the pipe body of the intercooler intake pipe 100 is cantilevered. A space for accommodating the water inlet and return pipes of the intercooler 212 is formed below the second intercooler intake pipe 112. In order to ensure that the space can be formed below the second intercooler intake pipe 112, each intermediate pipe section of the second intercooler intake pipe 112 is arranged horizontally.

[0072] The intercooler intake pipe 100 further includes a support assembly 140, which supports the second intercooler intake pipe 112 and includes a support member 147, a first pipe clamp 141, a second pipe clamp 142, a third pipe clamp 143, and a rubber tube jacket 146. The first pipe clamp 141 and the second pipe clamp 142 are spliced ​​to form a first clamping hole 144 for holding the middle pipe section, and the second pipe clamp 142 and the third pipe clamp 143 are spliced ​​to form a second clamping hole 145 for clamping the water inlet and return pipes, and the first clamping hole 144 and the second clamping hole 145 are both provided with a rubber tube jacket 146. The support member 147 is fixedly connected to the third pipe clamp 143, and the support member 147 is used to connect to the cylinder head 215, so that the pipe body of the intercooler intake pipe 100 is supported on the cylinder head 215. At the same time, the water inlet and return pipes are also supported on the cylinder head 215, which ensures the reliability of the cantilever intercooler intake pipe 100 and realizes the compactness of the whole machine.

[0073] Specifically, the first pipe clamp 141 has a semicircular notch with an opening at the bottom, and the second pipe clamp 142 has a semicircular notch with an opening at the top. The first pipe clamp 141 and the second pipe clamp 142 are fastened and connected by bolts. At this time, the two notches are butted to form a circular first clamping hole 144, and a rubber tube jacket 146 is provided in the first clamping hole 144. The middle pipe section of the second intercooler intake pipe 112 is passed through the first clamping hole 144 and is covered by the rubber tube jacket 146 to avoid damage. The second pipe clamp 142 has a semicircular notch with an opening at the bottom, and the third pipe clamp 143 has a semicircular notch with an opening at the top. The second pipe clamp 142 and the third pipe clamp 143 are fastened and connected by bolts. At this time, the two notches are butted to form a circular second clamping hole 145, and a rubber tube jacket 146 is provided in the second clamping hole 145. The inlet and return pipes are passed through the second clamping hole 145 and are covered by the rubber tube jacket 146 to avoid damage.

[0074] Since in this embodiment, the water inlet pipe 213 and the water return pipe 214 of the intercooler 212 are both located below the second intercooler intake pipe 112, the number of the second clamping holes 145 is two, and the two second clamping holes 145 are respectively provided for the water inlet pipe 213 and the water return pipe 214 to pass through.

[0075] Optionally, the rubber tube jacket 146 is an annular member with an opening in the circumferential direction, and is made of fluororubber. The opening size is 4 mm, and both axial ends thereof are provided with radially outward flanges, and the height of the flanges is 1 mm.

[0076] Optionally, in the present embodiment, the second intercooler intake pipe 112 has two suspended intermediate pipe sections, namely a first intermediate pipe section 117 and a second intermediate pipe section 118 . Therefore, in the present embodiment, the second intercooler intake pipe 112 is supported by two bracket assemblies 140 .

[0077] In this embodiment, there is no requirement for pipeline arrangement below the first intercooler intake pipe 111. Therefore, in this embodiment, the middle pipe section of the first intercooler intake pipe 111 has a concave structure, so that the two ends of the middle pipe section are at different heights, further reducing the occupied height space size. Specifically, the second middle pipe section 118 of the first intercooler intake pipe 111 is a bent structure, and the first middle pipe section 117 of the first intercooler intake pipe 111 is at a height lower than the height of the third middle pipe section 119.

[0078] Fig. 9 The supporting structure of the first intercooler intake pipe 111 provided in this embodiment is shown. Fig.10 for Fig. 9 The cross-sectional structure diagram at the middle BB. Please refer to Figure 1-Figure 10 In this embodiment, one end of the bracket assembly 140 supporting the middle pipe section of the first intercooler intake pipe 111 is fixedly connected to the mounting base 126 of the middle pipe section, and the other end of the bracket assembly 140 is used to connect with the cylinder head 215. Specifically, the bracket assembly 140 supporting the first intercooler intake pipe 111 includes a first connecting bolt 149, a supporting frame 148 and a second connecting bolt 150. The middle pipe section of the first intercooler intake pipe 111 is provided with the mounting base 126. The upper end of the supporting frame 148 is fastened to the mounting base 126 through the first connecting bolt 149, and the lower end of the supporting frame 148 is fastened to the cylinder head 215 through the second connecting bolt 150. Optionally, in this embodiment, the first intercooler intake pipe 111 has two suspended middle pipe sections, namely the first middle pipe section 117 and the second middle pipe section 118. Therefore, in this embodiment, the first intercooler intake pipe 111 is supported by two bracket assemblies 140.

[0079] The intercooler intake pipe 100 and V-type diesel engine provided by the embodiment of the present invention realize the connection of two adjacent rigid pipes 127 through the rubber sleeve 131, and are used in low-pressure, high-temperature operating conditions and vibration conditions to meet the lightweight requirements of the entire machine; after the rubber sleeve replaces the metal bellows, the structure is compact and the height of the intercooler intake pipe 100 and the diesel engine is reduced. Fig.11 is the height from the outlet of the supercharger 211 to the inlet of the air cooler in this embodiment, Fig.12 The height from the outlet of the supercharger 211 to the inlet of the air cooler when the bellows connection is conventionally adopted is compared. It can be seen that the height from the outlet of the compressor to the inlet of the air cooler in this embodiment is reduced by 114 mm.

[0080] At the same time, the connection between the rigid pipe 127 and the rubber sleeve is designed to prevent detachment and seal, so that the intercooler intake pipe 100 can be sealed for a long time without leakage. There is no steel wire in the rubber sleeve 131, which avoids the risk of entering the cylinder after aging and breaking. The high-performance polymer material Nomex coating 138 is used on the rubber sleeve 131, which has the characteristics of high fire resistance, high temperature resistance, and non-flammability, etc., meeting the structural reliability requirements.

[0081] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technology in the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An intercooler intake pipe for a high-power engine; the intercooler intake pipe comprises a pipe body, the pipe body comprises an intake joint and an outlet joint, the intake joint is used to connect with a supercharger, the outlet joint is used to connect with an intercooler, so as to deliver the compressed gas supercharged by the supercharger to the intercooler; characterized in that: The pipe body further comprises a plurality of rigid pipes and a connection assembly connected between two adjacent rigid pipes, wherein one of the rigid pipes has the air inlet connector, and another of the rigid pipes has the air outlet connector; The connecting assembly includes a rubber sleeve and a fixing clamp, the rubber sleeve has a first fitting section, a large diameter section and a second fitting section which are connected in sequence, the inner diameter of the large diameter section is larger than the inner diameter of the first fitting section and the second fitting section; the first fitting section and the second fitting section are respectively sleeved on two adjacent rigid pipe fittings, and the first fitting section and the second fitting section are fastened to the rigid pipe fitting by the fixing clamp; there is a gap between two adjacent rigid pipe fittings, and the large diameter section covers the gap.

2. The intercooler intake pipe according to claim 1, characterized in that: One end of the rigid pipe fitting has a connecting portion, which is connected to the first mating section or the second mating section; the connecting portion includes an end face ring flange arranged at the end of the rigid pipe fitting, the end face ring flange is located in the large diameter section, and the outer wall of the end face ring flange is spaced apart from the inner wall of the large diameter section.

3. The intercooler intake pipe according to claim 2, characterized in that: The gap size between the outer wall of the end face ring flange and the inner wall of the large diameter section is S, 6mm≤S≤8mm.

4. The intercooler intake pipe according to claim 2, characterized in that: The protruding height of the end face ring flange is H, 2.3mm≤H≤2.8mm.

5. The intercooler intake pipe according to claim 2, characterized in that: The connecting portion further comprises a sealing ring flange spaced apart from the end face ring flange, and grooves are arranged in the first matching section and the second matching section, and the sealing ring protrusion is embedded and matched in the grooves.

6. The intercooler intake pipe according to claim 5, characterized in that: The sealing ring flange is a convex structure with a semicircular cross section, and the radius of the sealing ring flange is R, 2.3mm≤R≤2.8mm.

7. The intercooler intake pipe according to claim 5, characterized in that: The fixing clamp is located between the end face ring flange of the connecting portion and the sealing ring flange.

8. The intercooler intake pipe according to claim 1, characterized in that: The rigid pipe fitting is connected with the rubber sleeve by interference fit, and the interference amount between the rigid pipe fitting and the rubber sleeve is calculated by the following formula: Among them, △ is the interference, unit is mm; P is the design sealing pressure, unit is MPa; Douter, dinner and δ are the outer diameter, inner diameter and thickness of the rubber casing, unit is mm; ρ is the rubber density, unit is g / cm 3 ; σ is the rubber rebound rate, unit is %; L is the length of the rigid pipe fitting inserted into the rubber sleeve, unit is mm; D is the diameter of the rigid pipe fitting.

9. The intercooler intake pipe according to claim 1, characterized in that: The pipe body has a first air intake joint and a second air intake joint, and the first air intake joint and the second air intake joint are respectively used to be connected to the supercharger; the rigid pipe fitting includes a first curved pipe section, a second curved pipe section and an intermediate pipe section, one end of the first curved pipe section forms the first air intake joint, and the other end of the first curved pipe section is connected to the intermediate pipe section through the connecting assembly; one end of the second curved pipe section forms the second air intake joint, and the other end of the second curved pipe section is connected to the intermediate pipe section through the connecting assembly.

10. The intercooler intake pipe according to claim 9, characterized in that: The middle pipe section has a concave structure so that the two ends of the middle pipe section are at different heights; The intercooler intake pipe also includes a bracket assembly, one end of which is fixedly connected to the mounting base of the middle pipe section; the other end of the bracket assembly is used to be connected to the cylinder head.

11. The intercooler intake pipe according to claim 9, characterized in that: The lower side of the middle pipe section is used to form a space for accommodating the inlet and return pipes of the intercooler; the intercooler intake pipe also includes a bracket assembly, and the bracket assembly includes a support, a first pipe clamp, a second pipe clamp, a third pipe clamp and a rubber tube jacket; the first pipe clamp and the second pipe clamp are spliced ​​to form a first clamping hole for clamping the middle pipe section, and the second pipe clamp and the third pipe clamp are spliced ​​to form a second clamping hole for clamping the inlet and return pipes, and the rubber tube jacket is provided in the first clamping hole and the second clamping hole; the support is fixedly connected to the third pipe clamp, and the support is used to be connected to the cylinder head.

12. The intercooler intake pipe according to claim 1, characterized in that: The rubber tube sleeve comprises a silicone rubber layer, an aramid cloth layer and a Nomex coating, wherein the aramid cloth layer is coated on the outside of the silicone rubber layer, and the Nomex coating is coated on the outside of the silicone rubber layer.

13. The intercooler intake pipe according to claim 1, characterized in that: The rigid pipe fitting is made of aluminum alloy.

14. A V-type diesel engine, characterized in that: The V-shaped diesel engine comprises a diesel engine body and an intercooler intake pipe as claimed in any one of claims 1 to 13, wherein the intercooler intake pipe is arranged in a V-shaped space of the diesel engine body.

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