An aluminum automotive engine outlet water pipe

By designing the combined structure of the water outlet pipe of aluminum automobile engines, sealing connection is achieved using rubber rings, Yin-Yang threads and clamps, and protective components are installed at the connections, the existing water outlet pipes are easily leaked and damaged, and a higher sealing and service life are achieved.

CN116398288BActive Publication Date: 2025-06-27WULIAN COUNTY JINMA TENGHUI MASCH CO LTD
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Patent Information

Application Number
CN202310397776.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-11
Publication Date
2025-06-27
Estimated Expiration
2043-04-11

AI Technical Summary

Technical Problem

During use, existing aluminum automotive engine outlet pipes are prone to liquid leakage, easy leakage at the connection, and the pipes and pipe fittings are susceptible to collision damage and causing leakage.

Method used

An aluminum automobile engine outlet pipe is designed, and a combined structure of engine pipe, drain pipe, connecting components, leakproof components and protection components is adopted. Through the combination of rubber rings, male and female threads and clamps, the sealing connection between the engine pipe and the drain pipe is achieved, and protective components are provided at the connection between the drain pipe and the engine pipe to prevent collision damage.

Benefits of technology

It effectively prevents liquid leakage, enhances the connection seal between the pipe fittings and the engine, and reduces the risk of damage and leakage of pipes and pipe fittings during use.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses an aluminum automotive engine outlet water pipe, belonging to the technical field of engines. Specifically, it is an aluminum automotive engine outlet water pipe, which includes an engine pipe, a drain pipe, a connection assembly, a leak-proof assembly, and a protection assembly. The engine pipe is connected to the drain pipe, and the engine pipe and the drain pipe are connected through the connection assembly. The leak-proof assembly is arranged inside and outside the connection between the engine pipe and the drain pipe. At the same time, the protection assembly is arranged at the bent part of the drain pipe. A rubber ring is movably connected between the engine pipe and the drain pipe, a ferrule is rotatably arranged outside the engine pipe and the drain pipe, and a baffle is movably connected inside the drain pipe. The beneficial effects of the present invention are as follows: Through the setting of the connection assembly, the drain pipe can be connected to the water outlet of the engine. At the same time, a rubber ring is arranged between the connection assemblies, which can effectively prevent water leakage at the connection.
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Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to an aluminum automotive engine outlet pipe. Background Art

[0002] An aluminum automotive engine outlet pipe is a pipe fitting connected to the engine coolant outlet. One end of the existing pipe fitting fits with the engine coolant outlet through a flange structure, and the other end is a smooth cylindrical surface with a ring-shaped protrusion, that is, a universal interface. Then, the pipe is connected to the universal interface through a clamp to complete the discharge of the coolant. However, during the use of the existing device, since the pipe and the pipe fitting are connected and fixed through a clamp, when the liquid is discharged, it is extremely easy to occur the situation of liquid leakage, thus affecting the normal operation of the engine;

[0003] At the same time, when the existing pipe fitting is connected to the engine, it is connected through a flange, so the connection between the pipe fitting and the engine is also prone to leakage;

[0004] During the use of the pipe fitting and the pipe, because they are often located outside the engine, they are prone to collision or unnecessary damage. Therefore, the pipe and the pipe fitting are prone to damage and leakage during use. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. In this part, as well as in the abstract and the title of the present application, some simplifications or omissions may be made to avoid obscuring the purpose of this part, the abstract, and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the problem of liquid leakage in the above or existing technologies, the present invention is proposed.

[0007] Therefore, the purpose of the present invention is to provide an aluminum automotive engine outlet pipe.

[0008] To solve the above technical problems, the present invention provides the following technical solution: an aluminum automotive engine outlet pipe, including an engine pipe, a drain pipe, a connection assembly, a leak-proof assembly, and a protection assembly. The engine pipe is connected to the drain pipe, and the engine pipe and the drain pipe are connected through the connection assembly. The leak-proof assembly is arranged inside and outside the connection between the engine pipe and the drain pipe. At the same time, a protection assembly is arranged at the bent part of the drain pipe. A rubber ring is movably connected between the engine pipe and the drain pipe. A ferrule is rotatably arranged outside the engine pipe and the drain pipe. A baffle is movably connected inside the drain pipe.

[0009] As a preferred embodiment of the aluminum automotive engine outlet pipe of the present invention, the following applies: A top plate is fixed to the outer top surface of the engine pipe, and female threads are engraved on the peripheral surface of the outer part of the top plate. Female threads are also engraved on the outer surface of the engine pipe.

[0010] As a preferred embodiment of the aluminum automotive engine outlet pipe of the present invention, the following applies: A bottom plate is fixed to the outer side of the drain pipe close to the engine pipe, and female threads are engraved on the periphery of the outer part of the bottom plate. At the same time, the female threads on the outer parts of the bottom plate and the top plate are connected. The drain pipe is bent, which can save installation space.

[0011] As a preferred embodiment of the internal connection component of the present invention, the following applies: The internal part of the connection component includes a screw, a nut, and a rod hole. The screw is located on the surface of the outer part of the top plate away from the engine pipe. The nut is rotatably arranged on the outer part of the screw. The rod hole is opened in the bottom plate of the drain pipe, and the screw is located inside the rod hole.

[0012] As a preferred embodiment of the aluminum automotive engine outlet pipe of the present invention, the following applies: An annular groove is opened in the inner circle of the surface of the top plate of the engine pipe on the side away from the engine pipe. A water separation groove is opened in the inner circle of the surface of the top plate of the engine pipe, and the water separation groove is located on the outer circle of the annular groove.

[0013] As a preferred embodiment of the leak prevention component of the present invention, the following applies: The internal part of the leak prevention component includes a rubber ring, female threads, male threads, and a ferrule. The rubber ring is located inside the water separation groove. The thickness of the rubber ring is equal to twice the depth of the water separation groove. Male threads are engraved on both the upper end and the lower end inside the ferrule.

[0014] As a preferred embodiment of the aluminum automotive engine outlet pipe of the present invention, the following applies: The inner diameter of one end of the ferrule is equal to the diameter of the bottom plate and the top plate. The inner diameter of the other end of the ferrule is equal to the outer diameter of the engine pipe. When not installed, the ferrule is sleeved on the outer part of the engine pipe. At the same time, one end of the ferrule close to the bottom plate and the top plate is hexagonal on the outside.

[0015] As a preferred embodiment of the aluminum automotive engine outlet pipe of the present invention, the following applies: An annular groove is opened in the inner circle of the surface of the bottom plate of the outer part of the drain pipe on the side away from the drain pipe. A water separation groove is opened in the inner circle of the surface of the bottom plate of the drain pipe, and the water separation groove is located on the outer circle of the annular groove.

[0016] As a preferred embodiment of the protection component of the present invention, the following applies: The internal part of the protection component includes a snap ring, a baffle, and a ferrule. A baffle is fixed inside the snap ring, and the baffle is located inside the drain pipe. The baffle is an arc plate and is bent. At the same time, the snap ring is located between the annular grooves. After the ferrule is rotatably installed, it is located on the outer parts of the engine pipe and the drain pipe, which can protect the engine pipe and the drain pipe.

[0017] As a preferred embodiment of the aluminum engine outlet pipe of the present invention, the male thread engages with the female thread, and the outer surface of the female thread is wound with PTFE tape, which can prevent water leakage. The ferrule is part of both the anti-leakage component and the protection component.

[0018] Advantages of the present invention: By providing the connection component, the drain pipe can be connected to the water outlet of the engine. At the same time, a rubber ring is provided between the connection components, which can effectively prevent water leakage at the connection. The overall drain pipe can effectively prevent leakage during use. The outer surface of the female thread is wound with PTFE tape, which can ensure that there are no gaps and leakage when the male and female threads are engaged. The overall drain pipe can ensure that the pipe itself is not easily damaged and leaked. The ferrule is provided at the connection between the drain pipe and the water outlet of the engine, which can prevent the drain pipe and the water outlet of the engine from being damaged by collision. Finally, a baffle is provided inside the drain pipe, which can effectively relieve the impact damage caused by the engine water outlet to the drain pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Among them:

[0021] Figure 1 is the overall structural schematic diagram of the present invention.

[0022] Figure 2 is the disassembled schematic diagram of the overall structure of the present invention.

[0023] Figure 3 is the cross-sectional view of the overall structure of the present invention.

[0024] Figure 4 is the schematic diagram of the structures such as the engine pipe and the drain pipe inside the present invention.

[0025] Figure 5 is the schematic diagram of the structures such as the engine pipe inside the present invention.

[0026] Figure 6 is the schematic diagram of the structures such as the engine pipe inside the present invention.

[0027] Figure 7 is the top view of the structures such as the ferrule inside the present invention.

[0028] Figure 8 is the bottom view of the structures such as the ferrule inside the present invention.

[0029] Figure 9 This is the bottom view of the structure such as the inner drain pipe of the present invention.

[0030] Figure 10 This is the schematic diagram of the structure such as the inner baffle of the present invention.

[0031] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0032] 100, drain pipe; 101, rod hole; 200, ferrule; 201, male thread; 300, engine pipe; 301, screw; 302, nut; 303, female thread; 304, annular groove; 305, water separating groove; 400, snap ring; 401, baffle; 500, rubber ring. Detailed implementation manners

[0033] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings of the specification.

[0034] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0035] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or selectively exclusive embodiments from other embodiments.

[0036] Embodiment 1

[0037] Refer to Figures 1 to 9 , which is the first embodiment of the present invention. This embodiment provides an aluminum engine outlet pipe for an automobile, which includes a leak-proof component and can achieve the effect of preventing leakage. The leak-proof component internally includes a rubber ring 500, a female thread 303, a male thread 201 and a ferrule 200. The rubber ring 500 is located between the inner parts of the water separating groove 305. The outer surfaces of the engine pipe 300 and the top plate and bottom plate are engraved with the female thread 303. The upper and lower ends of the inner part of the ferrule 200 are engraved with the male thread 201.

[0038] Specifically, the thickness of the rubber ring 500 is equal to twice the thickness of the water separation groove 305. In this way, when the engine pipe 300 and the drain pipe 100 are connected and sealed, the rubber ring 500 can be squeezed, so as to fill the inside of the water separation groove 305, thus ensuring that the connection gap between the engine pipe 300 and the drain pipe 100 will not easily leak.

[0039] Furthermore, the external surface of the female thread 303 is wound with Teflon tape. In this way, when the female thread 303 is rotationally matched with the male thread 201, the Teflon tape can fill the gap between the threads, thus ensuring secondly that the connection between the engine pipe 300 and the drain pipe 100 will not leak.

[0040] Among them, the ferrule 200 is sleeved outside the engine pipe 300. The inner diameter of one end of the ferrule 200 close to the top plate and the bottom plate is equal to the outer diameter of the bottom plate and the top plate, and the inner diameter of the other end of the ferrule 200 is equal to the outer diameter of the engine pipe 300. In this way, the ferrule 200 can move or rotate outside the engine pipe 300, and the ferrule 200 seals the top plate and the bottom plate through the male thread 201 and the female thread 303.

[0041] Preferably, the outside of the ferrule 200 is hexagonal, so that it is more convenient and fast to rotate the ferrule 200.

[0042] It should be noted that the rubber ring 500 and the water separation groove 305 are located between the relative interiors of the screw 301, thus avoiding the possibility of liquid leaking out from inside the screw 301 and the rod hole 101.

[0043] When using this device for installation, first place the rubber ring 500 between the water separation grooves 305 opened inside the engine pipe 300. Then align the drain pipe 100 with the engine pipe 300, and at the same time align the rod hole 101 opened inside the bottom plate with the screw 301 fixedly arranged on the top plate. Then the drain pipe 100 can be moved towards the engine pipe 300 until the rubber ring 500 enters between the water separation grooves 305 opened inside the drain pipe 100. At this time, the nut 302 can be rotated and set above the screw 301 until the top plate arranged outside the engine pipe 300 is closely attached to the bottom plate arranged outside the drain pipe 100. In this way, the rubber ring 500 can seal the gap between the top plate and the bottom plate, thus ensuring no leakage.

[0044] After the engine pipe 300 is connected to the drain pipe 100, Teflon tape is then wrapped around the outside of the engine pipe 300, the top plate and the bottom plate. Then, a wrench is used to turn the ferrule 200 to rotate, and the male thread 201 is inserted into the female thread 303. In this way, even if the rubber ring 500 wears and leaks during use, the ferrule 200 can achieve a sealing effect through the Teflon tape, the male thread 201 and the female thread 303, thereby achieving a multiple protection effect against leakage.

[0045] In summary, when this device is in use, a double protection method is adopted to seal the connection between the drain pipe 100 and the engine pipe 300, so that it can be ensured that the device will not easily leak during use.

[0046] Embodiment 2

[0047] Referring to Figures 1 to 10 , this is the second embodiment of the present invention. On the basis of Embodiment 1, this embodiment provides a protection component, which solves the problems of impact damage and collision damage at the connection of the drain pipe 100. The protection component includes a retaining ring 400, a baffle 401, and a ferrule 200. The retaining ring 400 is a circular plate, and the baffle 401 is located inside the retaining ring 400, and the baffle 401 crosses the inner diameter of the retaining ring 400, while the ferrule 200 is sleeved outside the engine pipe 300.

[0048] Specifically, the retaining ring 400 is located inside the annular groove 304. At the same time, the retaining ring 400 is located between the top plate of the engine pipe 300 and the bottom plate of the drain pipe 100, and the retaining ring 400 will not easily rotate when clamped by the top plate and the bottom plate.

[0049] Furthermore, the baffle 401 is located inside the drain pipe 100, and the baffle 401 is bent and just covers the bent part of the drain pipe 100. Then, the width of the baffle 401 after bending is less than or equal to the inner diameter of the drain pipe 100, so that the baffle 401 can be inserted inside the drain pipe 100 for installation.

[0050] Preferably, after the baffle 401 is bent, it can ensure that part of the impact force during the drainage of the engine pipe 300 can be relieved by the baffle 401, thereby avoiding the possibility that the drain pipe 100 is damaged due to the long-term impact force of the drainage of the engine pipe 300.

[0051] It should be noted that the ferrule 200 is also a part of both the leak-proof component and the protection component, that is, the ferrule 200 can not only achieve the effect of preventing leakage, but also play a role in protecting the engine pipe 300 and the drain pipe 100.

[0052] When using the device for installation, first insert the baffle 401 into the interior of the drain pipe 100, and rotate the position of the baffle 401 so that the bending direction of the baffle 401 corresponds to the water inlet of the drain pipe 100, and then place the baffle 401 and the drain pipe 100 together outside the engine pipe 300, so that the clamping ring 400 can be clamped and fixed under the clamping of the top plate outside the engine pipe 300 and the bottom plate outside the drain pipe 100, so as to ensure that the impact force of the liquid will not completely impact the inner wall of the drain pipe 100 during the drainage process of the engine pipe 300, so as to effectively reduce the impact of the liquid and the corrosion of the drain pipe 100, and increase the service life of the drain pipe 100;

[0053] At the same time, the ferrule 200 is placed on the outside of the engine pipe 300, and after the ferrule 200 is rotated and installed on the outside of the connection between the engine pipe 300 and the drain pipe 100, the connection between the engine pipe 300 and the drain pipe 100 can be effectively protected and guarded. In this way, after a collision and impact, the ferrule 200 will be hit and damaged in the first time, thereby protecting the engine pipe 300 and the drain pipe 100 inside the ferrule 200.

[0054] In summary, the protective components arranged inside the device include the baffle 401 which can protect the drain pipe 100 from the inside of the pipe to prevent it from being directly impacted by the liquid, and the ferrule 200 which can protect the engine pipe 300 and the drain pipe 100 from the outside of the pipe. This dual protection from both inside and outside can effectively increase the service life of the drain pipe 100.

[0055] Example 3

[0056] Reference Figures 1 to 6 , which is the third embodiment of the present invention, provides a connection component based on the first embodiment, which solves the connection and fixation problem of the drain pipe 100. The connection component includes a screw 301, a nut 302 and a rod hole 101. The screw 301 is fixedly arranged on the top plate outside the engine pipe 300, and the outer surface of the screw 301 is engraved with a female thread 303, while the nut 302 is rotatably arranged on the outside of the screw 301, and the inner surface of the nut 302 is engraved with a male thread 201. The nut 302 is rotatably connected to the screw 301 through a thread, and the rod hole 101 is opened inside the bottom plate outside the drain pipe 100.

[0057] Specifically, the screw 301 is arranged in a circle on the outer surface of the top plate, and the screw 301 is not arranged on the side of the outer surface of the top plate close to the drain pipe 100, so that the bent part of the drain pipe 100 will not interfere with the connection between the screw 301 and the nut 302.

[0058] Furthermore, the rod holes 101 are circumferentially formed inside the bottom plate, and the rod holes 101 respectively correspond to the screw rods 301, and the screw rods 301 are located between the rod holes 101.

[0059] Preferably, the nuts 302 are located outside the bottom plate, and the diameter of the nuts 302 is larger than the diameter of the rod holes 101, so that the nuts 302 can block and fix the bottom plate and the drain pipe 100.

[0060] When using the present device for installation, first align the bottom plate of the drain pipe 100 with the top plate of the engine pipe 300, then rotate the drain pipe 100 to a proper position and align the rod holes 101 with the screw rods 301, and then move the drain pipe 100 and the bottom plate towards the engine pipe 300 and the top plate until the bottom plate is in contact with the top plate. At this time, rotate the nut 302 outside the screw rod 301 until the nut 302 cooperates with the screw rod 301 to tightly connect the engine pipe 300 and the drain pipe 100, thus completing the preliminary installation connection.

[0061] In summary, when the present device is connected, it is convenient, fast and stable, and the engine pipe 300 and the drain pipe 100 will not easily become loose or fall off.

[0062] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible on the premise of substantially not deviating from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various components, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature, number or position of discrete elements can be changed or altered. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structure that performs the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0063] In addition, to provide a concise description of exemplary embodiments, all features of the actual embodiments may not be described (i.e., those features that are not relevant to the currently contemplated best mode of carrying out the invention or those features that are not relevant to implementing the invention).

[0064] It should be understood that, in the development of any actual implementation, as in any engineering or design project, numerous specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without undue experimentation, such development efforts will be a routine task of design, fabrication, and production.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An aluminum automobile engine outlet water pipe, comprising an engine pipe (300), a drain pipe (100), a connection assembly, a leak-proof assembly and a protection assembly. The engine pipe (300) is connected to the drain pipe (100), and the engine pipe (300) and the drain pipe (100) are connected through the connection assembly. A leak-proof assembly is arranged on the inner and outer connections of the engine pipe (300) and the drain pipe (100). At the same time, a protection assembly is arranged at the bent part of the drain pipe (100). It is characterized in that: A rubber ring (500) is movably connected between the engine pipe (300) and the drain pipe (100). A ferrule (200) is rotatably arranged outside the engine pipe (300) and the drain pipe (100). A baffle (401) is movably connected inside the drain pipe (100). A top plate is fixed on the outer top surface of the engine pipe (300), and female threads (303) are engraved on the outer peripheral surface of the top plate. Female threads (303) are engraved on the outer surface of the engine pipe (300). A bottom plate is fixed on the outside of the drain pipe (100) on the side close to the engine pipe (300), and female threads (303) are engraved on the outer periphery of the bottom plate. At the same time, the female threads (303) on the outside of the bottom plate and the top plate are connected. The drain pipe (100) is bent. The leak-proof component internally includes a rubber ring (500), female threads (303), male threads (201), and a ferrule (200). The rubber ring (500) is located inside the water separation groove (305). The thickness of the rubber ring (500) is equal to twice the depth of the water separation groove (305). Male threads (201) are engraved at both the upper end and the lower end inside the ferrule (200). The protection component internally includes a retaining ring (400), a baffle (401), and a ferrule (200). A baffle (401) is fixed inside the retaining ring (400), and the baffle (401) is located inside the drain pipe (100). The baffle (401) is an arc plate and is bent. At the same time, the retaining ring (400) is located inside the ring groove (304). After the ferrule (200) is rotatably installed, it is located outside the engine pipe (300) and the drain pipe (100).

2. The aluminum engine coolant outlet pipe according to claim 1, characterized in that: The connection component internally includes a screw (301), a nut (302), and a rod hole (101). The screw (301) is located on the surface of the top plate outside the engine pipe (300) and away from the engine pipe (300). The nut (302) is rotatably arranged outside the screw (301). The rod hole (101) is opened inside the bottom plate of the drain pipe (100), and the screw (301) is located inside the rod hole (101).

3. The aluminum engine coolant outlet pipe according to claim 1, wherein: An inner ring of the surface of the top plate of the engine pipe (300) on the side away from the engine pipe (300) is provided with a ring groove (304). An inner ring of the surface of the top plate of the engine pipe (300) is provided with a water separation groove (305), and the water separation groove (305) is located outside the ring groove (304).

4. The aluminum engine coolant outlet pipe according to claim 1, characterized in that: The inner diameter of one end of the ferrule (200) is equal to the diameters of the bottom plate and the top plate. The inner diameter of the other end of the ferrule (200) is equal to the outer diameter of the engine pipe (300). When the ferrule (200) is not installed, it is sleeved outside the engine pipe (300). At the same time, one end of the ferrule (200) close to the bottom plate and the top plate is hexagonal on the outside.

5. The aluminum engine coolant outlet pipe according to claim 1, wherein: An inner ring of the surface of the bottom plate outside the drain pipe (100) on the side away from the drain pipe (100) is provided with a ring groove (304). An inner ring of the surface of the bottom plate of the drain pipe (100) is provided with a water separation groove (305), and the water separation groove (305) is located outside the ring groove (304).

6. The aluminum engine coolant outlet pipe according to claim 1, characterized in that: The male thread (201) engages with the female thread (303), and the outer surface of the female thread (303) is wound with PTFE tape.

Citation Information

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