Engine and double-layer common rail pipe thereof

Abstract

The utility model discloses an engine and a double-layer common rail pipe thereof. A body of the double-layer common rail pipe comprises a body inner-layer pipe body, a body outer-layer pipe body and two flanges which are fixedly connected together. The two flanges are connected to the two ends of the body inner-layer pipe body and the two ends of the body outer-layer pipe body respectively. A body outer-layer flow channel is formed between the body outer-layer pipe body and the body inner-layer pipe body, and a body inner-layer flow channel is formed in an inner cavity of the body inner-layer pipe body. A connector is detachably connected to the body and comprises a connector outer-layer pipe body and a connector inner-layer pipe body, a connector outer-layer flow channel communicated with the body outer-layer flow channel is formed between the connector outer-layer pipe body and the connector inner-layer pipe body, and a connector inner-layer flow channel communicated with the body inner-layer flow channel is formed in an inner cavity of the connector inner-layer pipe body. When the double-layer common rail pipe is matched with external connecting pieces of different specifications, the connectors matched with the external connecting pieces can be selected to be used, the double-layer common rail pipe can be connected with the external connecting pieces of different specifications in a matched mode, usability and universality of the double-layer common rail pipe are improved, and using cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine and a double-layer common rail pipe thereof. Background Art

[0002] The main function of the common rail is to store fuel and buffer the fluctuations caused by fuel injection and fuel pumping. When the fuel output is large, the pressure in the common rail is kept constant, thereby ensuring that the fuel injection pressure of each cylinder is consistent. The double-wall pipeline structure consists of two layers of pipelines, divided into an inner tube and an outer tube. There is a volume space between the inner and outer pipelines. The function of the double-layer pipeline is that when the inner pipeline leaks, the outer pipeline can still play a protective role to prevent the fuel in the inner pipeline from leaking into the atmosphere.

[0003] At present, the common rail pipe used in the market is a Chinese utility model patent with the authorization announcement number of "CN213953789U" and the patent name of "A L-shaped flow channel double-wall common rail pipe". The specific structure is: the L-shaped flow channel double-wall common rail pipe includes a double-wall common rail pipe body, which includes a common rail pipe outer layer pipe, a common rail pipe inner layer pipe and a flange formed by welding. The common rail pipe outer layer pipe and the common rail pipe inner layer pipe form a common rail pipe inner layer flow channel, and the common rail pipe outer layer flow channel is set as an L-shaped flow channel.

[0004] The above-mentioned L-shaped flow channel double-wall common rail pipe uses a flange-shaped double-layer branch pipe. Since the flange-shaped double-layer branch pipe and the common rail pipe body are a fixed connection structure and are fixedly connected together by welding, the welding process is relatively complicated, the flange-shaped branch pipe and the body cannot be disassembled, the interface size between the flange-shaped branch pipe and the external connection part is single, the versatility is poor, and the sealing surface of the flange-shaped connection surface is relatively large, requiring high processing precision and high production cost.

[0005] When the L-shaped flow channel double-wall common rail pipe is used, according to actual needs, multiple sections of flange-shaped double-layer branch pipes need to be assembled together by welding. Due to the large number of sections and relatively more sealing points, there are many possible leakage points, and the reliability during use is poor.

[0006] The welding process required in the welding process is relatively complicated, and the sealing surface of the radial flange surface is large, requiring high processing accuracy and high production cost. Summary of the invention

[0007] In order to overcome the above defects, the first technical problem solved by the utility model is that the utility model provides a double-layer common rail pipe, which can be adapted and connected with external parts of different specifications when used, thereby improving the usability and versatility of the double-layer common rail pipe and reducing the cost of use.

[0008] In order to solve the above technical problems, the utility model discloses a double-layer common rail pipe, comprising a main body, wherein the main body comprises an inner layer tube body, an outer layer tube body, and two flanges fixedly connected together; the two flanges are respectively connected to the two ends of the inner layer tube body and the outer layer tube body of the main body; an outer layer flow channel of the main body is formed between the outer layer tube body of the main body and the inner layer tube body of the main body, and the inner cavity of the inner layer tube body of the main body forms the inner layer flow channel of the main body; a joint is detachably connected to the main body, wherein the joint comprises an outer layer tube body and an inner layer tube body of the joint, an outer layer flow channel of the joint is formed between the outer layer tube body of the joint and the inner layer tube body of the joint, the inner cavity of the inner layer tube body of the joint forms the inner layer flow channel of the joint, the outer layer flow channel of the joint is connected to the outer layer flow channel of the main body, and the inner layer flow channel of the joint is connected to the inner layer flow channel of the main body.

[0009] Furthermore, the outer tube body of the joint includes a first section and a second section connected together, the first section is connected to the body; and the second section is connected to an external connection component.

[0010] Furthermore, the outer layer tube body of the main body is provided with an external connecting part, which is enclosed to form an external connecting hole, and the external connecting hole is connected with the outer layer flow channel of the main body; the inner layer tube body of the main body is provided with an internal connecting part, which is enclosed to form an internal connecting hole, and the internal connecting hole is connected with both the inner layer flow channel of the main body and the outer layer flow channel of the main body; the position of the external connecting hole corresponds to that of the internal connecting hole; the joint is inserted into the external connecting hole and the internal connecting hole at the same time, and the joint is connected to the internal connecting part and the external connecting part at the same time.

[0011] Furthermore, the outer circumference of the first section is provided with a sealing ring A and a sealing ring B, and the outer circumference of the second section is provided with a sealing ring C; the sealing ring A is arranged between the first section and the inner connecting part, and the sealing ring B is arranged between the first section and the outer connecting part; the sealing ring C is arranged between the second section and the external connecting part.

[0012] Furthermore, an axial limiting groove is provided on the flange, and the end of the inner tube of the main body is inserted into the limiting groove.

[0013] Furthermore, a body outer layer flow channel hole is provided on the flange, and the body outer layer flow channel hole is communicated with the body outer layer flow channel.

[0014] Furthermore, the flow channel holes in the outer layer of the main body are waist-shaped holes.

[0015] Furthermore, the flange is provided with bolt connection holes, and the bolt connection holes are located outside the outer layer flow channel holes.

[0016] Furthermore, six connectors are provided.

[0017] Based on a general inventive concept, the second technical problem solved by the utility model is to provide an engine that can be adapted and connected with external parts of different specifications when in use, thereby improving the usability and versatility of the double-layer common rail pipe of the engine and reducing the cost of use.

[0018] An engine comprises an engine body, on which the double-layer common rail pipe as described above is arranged.

[0019] After adopting the above technical scheme, the beneficial effect of the utility model is that the main body of the double-layer common rail pipe includes a main body inner layer pipe body, a main body outer layer pipe body, and two flanges fixedly connected together. The two flanges are respectively connected to the two ends of the main body inner layer pipe body and the main body outer layer pipe body. The main body outer layer flow channel is formed between the main body outer layer pipe body and the main body inner layer pipe body, and the inner cavity of the main body inner layer pipe body forms the main body inner layer flow channel. The main body is detachably connected with a joint, the joint includes a joint outer layer pipe body and a joint inner layer pipe body, a joint outer layer flow channel is formed between the joint outer layer pipe body and the joint inner layer pipe body, the inner cavity of the joint inner layer pipe body forms the joint inner layer flow channel, the joint outer layer flow channel is connected to the main body outer layer flow channel, and the joint inner layer flow channel is connected to the main body inner layer flow channel. When the double-layer common rail pipe matches external connectors of different specifications, a joint compatible with the external connector can be selected, which can be adapted and connected with external connectors of different specifications, thereby improving the usability and versatility of the double-layer common rail pipe of the utility model and reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the double-layer common rail pipe of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a double-layer common rail pipe of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the double-layer common rail pipe (without the joint) of the utility model;

[0023] Figure 4 yes Figure 2 An enlarged view of the left side view;

[0024] Figure 5 yes Figure 2 A partial enlarged view of the middle A area;

[0025] Figure 6 yes Figure 5 An enlarged structural diagram of the middle joint;

[0026] Figure 7 yes Figure 3 A partial enlarged view of the middle B area;

[0027] In the figure, 1. outer layer tube body of the main body; 11. outer connecting hole; 12. outer connecting part; 2. inner layer tube body of the main body; 21. inner connecting hole; 22. inner connecting part; 3. flange; 31. limiting groove; 32. outer layer flow channel hole of the main body; 33. bolt connection hole; 4. outer layer tube body of the joint; 41. first section; 42. second section; 43. outer layer flow channel hole of the joint; 5. inner layer tube body of the joint; 6. sealing ring A; 7. sealing ring B; 8. sealing ring C. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Embodiment 1:

[0030] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 ,as well as Figure 7 As shown together, a double-layer common rail pipe includes a body, the body includes a body inner layer tube body 2, a body outer layer tube body 1, and two flanges 3 fixedly connected together, and the two flanges 3 are respectively connected to the two ends of the body inner layer tube body 2 and the body outer layer tube body 1. The body inner layer tube body 2, the body outer layer tube body 1, and the two flanges 3 are fixedly connected together by welding, or connected together by other conventional fixed connection methods, which will not be repeated here.

[0031] Preferably, an axial limiting groove 31 is further provided on the flange 3 , and the end of the inner tube body 2 of the main body is inserted into the limiting groove 31 .

[0032] During welding, one end of the body inner layer tube 2 is inserted into the limiting groove 31 of the corresponding flange 3, the body outer layer tube 1 is sleeved on the outside of the body inner layer tube 2, and one end of the body inner layer tube 2, one end of the body outer layer tube 1, and one of the flanges 3 are welded together. Then, the other end of the body inner layer tube 2 is inserted into the limiting groove 31 of the other flange 3, and the other end of the body inner layer tube 2, the other end of the body outer layer tube 1, and the other flange 3 are welded together.

[0033] An outer layer flow channel of the body is formed between the outer layer tube body 1 of the body and the inner layer tube body 2 of the body, and the inner cavity of the inner layer tube body 2 of the body forms an inner layer flow channel of the body.

[0034] Combination Figure 1 , Figure 2 , Figure 3 , Figure 5 ,as well as Figure 6As shown together, a joint is detachably connected to the main body, and the joint includes a joint outer layer tube body 4 and a joint inner layer tube body 5. An outer layer flow channel of the joint is formed between the joint outer layer tube body 4 and the joint inner layer tube body 5. The inner cavity of the joint inner layer tube body 5 forms an inner layer flow channel of the joint. The outer layer flow channel of the joint is connected with the outer layer flow channel of the main body, and the inner layer flow channel of the joint is connected with the inner layer flow channel of the main body.

[0035] Preferably, the joint outer tube body 4 includes a first section 41 and a second section 42 connected together, wherein the first section 41 is connected to the body, and the second section 42 is connected to an external component (not shown in the figure). The external component may be a low-pressure oil pipe or an injector of an engine.

[0036] During design and manufacturing, the specifications of the outer tube body 4 of the joint can be designed to connect external parts of different specifications, that is, the first section 41 has the same specifications and is connected to the double-layer common rail pipe, and the second section 42 can be designed to have different specifications and be connected to external parts of different specifications according to actual needs.

[0037] Of course, the first section 41 can also be designed into structures of different specifications to facilitate connection with double-layer common rail pipes of different specifications.

[0038] Further preferably, the outer tube body 1 of the main body is provided with an outer connection portion 12, which encloses an outer connection hole 11, and the outer connection hole 11 is connected to the outer flow channel of the main body. The inner tube body 2 of the main body is provided with an inner connection portion 22, which encloses an inner connection hole 21, and the inner connection hole 21 is connected to both the inner flow channel of the main body and the outer flow channel of the main body. When the outer tube body 1 of the main body, the inner tube body 2 of the main body, and the two flanges 3 are welded together, the positions of the outer connection hole 11 and the inner connection hole 21 correspond.

[0039] When installing the joint, the joint is inserted into the outer connection hole 11 and the inner connection hole 21 at the same time, and the joint is connected to the inner connection part 22 and the outer connection part 12 at the same time.

[0040] Further preferably, the outer circumference of the first section 41 is sleeved with a sealing ring A6 and a sealing ring B7, and the outer circumference of the second section 42 is sleeved with a sealing ring C8. When the joint is installed on the body, the sealing ring A6 is arranged between the first section 41 and the inner connecting portion 22, and the sealing ring B7 is arranged between the first section 41 and the outer connecting portion 12; when the double-layer common rail pipe of the utility model is connected to the external connection part, the sealing ring C8 is arranged between the second section 42 and the external connection part.

[0041] A joint outer layer flow channel hole 43 is also provided at the end of the second section 42 of the joint outer layer tube body 4 of the joint, and the joint outer layer flow channel hole 43 is connected to the joint outer layer flow channel.

[0042] Combination Figure 1 , Figure 2 , Figure 3, Figure 4 ,as well as Figure 7 As shown together, the flange 3 is provided with a body outer layer flow channel hole 32, and the body outer layer flow channel hole 32 is connected to the body outer layer flow channel.

[0043] Preferably, the outer flow channel hole 32 of the body is a waist-shaped hole.

[0044] The flange 3 is provided with bolt connection holes 33, which are located outside the outer flow channel hole 32 of the main body. The double-layer common rail pipe of the utility model is fixedly connected with other parts by using the bolt connection holes 33.

[0045] There are six connectors, or a corresponding number of connectors can be set according to the actual needs of the customer.

[0046] Fluids such as gas and liquid can flow through the double-layer common rail pipe of the utility model.

[0047] Embodiment 2:

[0048] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 ,as well as Figure 7 As shown together, the utility model also discloses an engine, which includes a body (not shown in the figure) on which the double-layer common rail pipe of embodiment 1 is arranged, and the double-layer common rail pipe is installed on the body of the engine through the connection of other parts.

[0049] The following is a detailed description of the process of using the double-layer common rail pipe of the utility model to supply fuel to each cylinder of a six-cylinder engine:

[0050] A connector with suitable specifications is selected and installed on the double-layer common rail pipe, and connected to an external part, which can be a low-pressure oil pipe, an injector and other parts of the engine. The connector and the double-layer common rail pipe are threadedly connected, and at the same time, the connector and the external part are also threadedly connected. It is easy to be damaged at the connection between the connector and the external part, which may lead to leakage of the fluid at the connection. Methanol or other fluids flow into the inner layer flow channel of the body of the double-layer common rail pipe of the utility model, and flow into the external part through the inner layer flow channel of the connector connected thereto. If a fluid leak occurs, the leaked fluid flows into the outer layer flow channel of the connector through the outer layer flow channel hole 43 of the connector, and is collected in the outer layer flow channel of the body, and then flows out of the double-layer common rail pipe through the outer layer flow channel hole 32 of the body on the flange 3. Finally, an external device (not shown in the figure) is used to collect the discharged leaked fluid, effectively ensuring the reliability of the engine operation, and effectively avoiding the leaked fluid from being directly discharged into the atmosphere to pollute the environment.

[0051] In the description of this specification, it needs to be understood that the orientations or positional relationships described in terms of “body outer layer tube body”, “body inner layer tube body”, “external connecting hole”, “internal connecting hole”, “external connecting part”, “internal connecting part”, “body outer layer flow channel hole”, “joint outer layer flow channel hole”, “joint outer layer tube body”, “joint inner layer tube body”, “body outer layer flow channel”, “body inner layer flow channel”, “joint outer layer flow channel”, “joint inner layer flow channel”, “axial”, “outside”, “outer peripheral surface”, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0052] The technical features named with serial numbers in this specification (such as the first section, the second section, sealing ring A, sealing ring B, sealing ring C, etc.) are only for distinguishing the various technical features and do not represent the positional relationship, installation sequence and working sequence between the various technical features.

[0053] The present utility model is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present utility model.

Claims

1. A double-layer common rail pipe, characterized in that: The body comprises a body, wherein the body comprises an inner tube body, an outer tube body, and two flanges that are fixedly connected together; the two flanges are respectively connected to the inner tube body and the two ends of the outer tube body; an outer flow channel of the body is formed between the outer tube body and the inner tube body, and the inner cavity of the inner tube body forms the inner flow channel of the body; A joint is detachably connected to the main body, and the joint includes an outer tube body and an inner tube body. An outer flow channel of the joint is formed between the outer tube body and the inner tube body of the joint, and an inner cavity of the inner tube body of the joint forms an inner flow channel of the joint. The outer flow channel of the joint is connected to the outer flow channel of the main body, and the inner flow channel of the joint is connected to the inner flow channel of the main body.

2. The double-layer common rail pipe according to claim 1, characterized in that: The outer tube body of the joint comprises a first section and a second section connected together, wherein the first section is connected to the body; and the second section is connected to an external connection member.

3. The double-layer common rail pipe according to claim 2, characterized in that: The outer layer tube body of the main body is provided with an external connecting part, which is enclosed to form an external connecting hole, and the external connecting hole is connected with the outer layer flow channel of the main body; the inner layer tube body of the main body is provided with an internal connecting part, which is enclosed to form an internal connecting hole, and the internal connecting hole is connected with both the inner layer flow channel of the main body and the outer layer flow channel of the main body; the position of the external connecting hole corresponds to that of the internal connecting hole; the joint is inserted into the external connecting hole and the internal connecting hole at the same time, and the joint is connected to the internal connecting part and the external connecting part at the same time.

4. The double-layer common rail pipe according to claim 3, characterized in that: The outer circumference of the first section is provided with a sealing ring A and a sealing ring B, and the outer circumference of the second section is provided with a sealing ring C; the sealing ring A is arranged between the first section and the inner connecting part, and the sealing ring B is arranged between the first section and the outer connecting part; the sealing ring C is arranged between the second section and the external connecting part.

5. The double-layer common rail pipe according to claim 1, characterized in that: The flange is provided with an axial limiting groove, and the end of the inner tube of the main body is inserted into the limiting groove.

6. The double-layer common rail pipe according to claim 1, characterized in that: The flange is provided with a body outer layer flow channel hole, and the body outer layer flow channel hole is connected with the body outer layer flow channel.

7. The double-layer common rail pipe according to claim 6, characterized in that: The outer flow channel holes of the main body are waist-shaped holes.

8. The double-layer common rail pipe according to claim 6, characterized in that: The flange is provided with bolt connection holes, and the bolt connection holes are located outside the outer layer flow channel holes.

9. The double-layer common rail pipe according to claim 1, characterized in that: The number of the joints is six.

10. An engine, comprising a body, characterized in that: The engine body is provided with a double-layer common rail pipe as claimed in any one of claims 1 to 9.

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