Screw plug with conical surface sealing structure

Abstract

The utility model discloses a plug with a conical surface sealing structure, which belongs to the technical field of oil duct sealing and comprises a plug body mounted at a threaded orifice of a main oil duct to seal the main oil duct, the front end of the plug body is provided with a first chamfer, and the front of the plug body is provided with an external thread. A sealing conical surface is arranged at the rear end part of the plug body; a thread tool withdrawal groove is formed between the external thread and the sealing conical surface, and an inner hexagonal structure groove is formed in the sealing conical surface. According to the utility model, a conical surface sealing structure is added on the basis of the original thread sealing, so that the effectiveness and the reliability of the whole sealing are improved, and the problems of untight sealing and oil leakage of the main oil duct are solved.

Description

Technical Field

[0001] The utility model relates to the field of oil channel sealing, in particular to a screw plug with a conical surface sealing structure. Background Art

[0002] When sealing the oil passages of various parts in diesel engines, a threaded sealing structure is often used. That is, a threaded hole of a certain specification is machined in the part, and then a screw plug of the same specification is used for sealing. The thread sealant needs to be applied during assembly.

[0003] After running for a period of time, some diesel engines often experience oil leakage at the screw plug installation site due to the influence of vibration and temperature. The main reason is that the tolerance of the metric thread center diameter is relatively large, and the manual glue application method has uneven application. Relying solely on thread sealing method cannot effectively seal or the sealing reliability is poor.

[0004] like Figure 5-8 As shown, the existing original screw plug 3 has an original thread 3-1 with a full thread structure on the outer circle, and one end is designed with a chamfer to guide the installation; the other end is designed with an original internal hexagonal structure groove 3-2, which is convenient for installation using a hexagonal tightening tool. The existing sealing method is thread sealing, which is sealed by applying sealant in combination with the thread. This sealing method is single, cannot be effectively sealed or has poor sealing reliability, and with the influence of vibration and temperature, it will cause leakage problems at the screw plug position.

[0005] Therefore, it is necessary to design a screw plug with a conical sealing structure to solve the technical problems of poor sealing or poor reliability of traditional screw plugs. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a screw plug with a conical surface sealing structure, which can realize a double sealing structure of thread sealing and end face sealing in the oil channel sealing, and ensure the reliability and stability of the sealing of the entire component.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A screw plug with a conical surface sealing structure comprises a screw plug body installed at a threaded hole position of a main oil channel to seal the main oil channel, the front end of the screw plug body is provided with a first chamfer, the front part is provided with an external thread, and the rear end of the screw plug body is provided with a sealing conical surface; a thread backing groove is provided between the external thread and the sealing conical surface, and an inner hexagonal structure groove is provided inside the sealing conical surface.

[0009] A further improvement of the technical solution of the utility model is that the second chamfer angle β of the sealing cone surface is 45°.

[0010] A further improvement of the technical solution of the utility model is that: the thread backing groove is composed of an inclined surface and an arc surface, and the angle α between the extended line of the inclined surface and the external thread plane is 50°.

[0011] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0012] 1. The utility model adds a conical sealing structure on the basis of the original thread seal, improves the effectiveness and reliability of the overall seal, and solves the problems of poor sealing and oil seepage and leakage in the main oil channel.

[0013] 2. The utility model is provided with a thread backing groove between the external thread and the sealing cone surface, which, on the one hand, ensures the manufacturing processability of the left end external thread processing, and on the other hand, the 45° sealing cone surface can form a new sealing end face with the 45° chamfered cone surface of the main oil channel threaded hole. After the overall installation is completed, a double sealing structure of the thread and the 45° sealing cone surface is realized, thereby improving the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor;

[0015] Figure 1 It is a schematic diagram of a screw plug main oil passage seal with a conical surface sealing structure provided in an embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of a screw plug structure with a conical sealing structure provided in an embodiment of the utility model;

[0017] Figure 3 It is a top view of a screw plug with a conical sealing structure provided in an embodiment of the utility model;

[0018] Figure 4 It is an enlarged schematic diagram of the threaded undercut groove I in the embodiment of the utility model;

[0019] Figure 5 This is a schematic diagram of the original screw plug assembly structure in the background technology of the utility model;

[0020] Figure 6 This utility model background technology Figure 5 A partial enlarged view of the main oil channel sealing structure AA;

[0021] Figure 7 This is a cross-sectional view of the original screw plug in the background technology of the utility model;

[0022] Figure 8 It is a top view of the original screw plug in the background technology of the utility model;

[0023] Among them, 1. main oil channel; 1-1. threaded hole; 2. screw plug body; 2-1. external thread; 2-2. thread backing groove; 2-3. internal hexagonal structure groove; 2-4. sealing cone surface; 3. original screw plug; 3-1. original external thread; 3-2. original internal hexagonal structure groove. DETAILED DESCRIPTION

[0024] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0028] like Figure 1-3As shown, a screw plug with a conical surface sealing structure includes a screw plug body 2 installed at the threaded hole 1-1 position of the main oil channel 1 to seal the main oil channel 1, the front end of the screw plug body 2 is provided with a first chamfer, the front part is provided with an external thread 2-1, and the rear end of the screw plug body 2 is provided with a sealing cone surface 2-4; a thread backing groove 2-2 is provided between the external thread 2-1 and the sealing cone surface 2-4, and an inner hexagonal structure groove 2-3 is provided inside the sealing cone surface 2-4.

[0029] Further, such as Figure 4 As shown, the second chamfer β of the sealing cone 2-4 is 45°. When assembling parts, not only can the thread seal be achieved, but also the 45° sealing cone 2-4 of the screw plug and the 45° third chamfered cone of the threaded hole 1-1 can form a new sealing end face, thereby improving the reliability and effectiveness of the overall structural sealing.

[0030] Further, such as Figure 4 As shown, the thread backing groove 2-2 is composed of an inclined surface and an arc surface, and the angle α between the extended line of the inclined surface and the plane of the external thread 2-1 is 50°. The thread backing groove 2-2 is provided to ensure the manufacturing processability of the external thread 2-1 of the screw plug.

[0031] Installation process:

[0032] During installation, first apply sealant to the external thread 2-1 of the screw plug with a conical sealing structure and the 45° sealing cone 2-4;

[0033] Then use a hexagonal tightening tool to install the screw plug with a conical sealing structure to the threaded hole 1-1 position of the main oil channel 1 (the original 45° third chamfer);

[0034] Finally, a hexagonal tightening tool is inserted into the inner hexagonal structure groove 2-3 to tighten the screw plug with the conical sealing structure, so that the sealing conical surface 2-4 of the screw plug with the conical sealing structure and the two end surfaces of the third chamfered conical surface of the threaded hole 1-1 fit tightly.

[0035] After installation, the whole component can form a double sealing structure, one is the external thread 2-1 of the screw plug with a conical sealing structure and the internal thread sealing structure of the main oil channel 1, and the other is the 45° sealing cone 2-4 of the screw plug with a conical sealing structure and the 45° third chamfered cone sealing structure of the threaded hole 1-1 of the main oil channel 1. The double sealing structure has a stable sealing method and high reliability, which can effectively avoid the occurrence of oil leakage.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A screw plug with a conical surface sealing structure, comprising a screw plug body (2) installed at a threaded hole (1-1) of a main oil passage (1) to seal the main oil passage (1), wherein the front end of the screw plug body (2) is provided with a first chamfer and the front part is provided with an external thread (2-1), characterized in that: A sealing cone surface (2-4) is provided at the rear end of the screw plug body (2); a thread backing groove (2-2) is provided between the external thread (2-1) and the sealing cone surface (2-4); and an inner hexagonal structure groove (2-3) is provided inside the sealing cone surface (2-4).

2. The screw plug with a conical surface sealing structure according to claim 1, characterized in that: The second chamfer angle β of the sealing cone surface (2-4) is 45°.

3. The screw plug with a conical surface sealing structure according to claim 1, characterized in that: The thread backing groove (2-2) is composed of an inclined surface and an arc surface, and the included angle α between the extended line of the inclined surface and the plane of the external thread (2-1) is 50°.

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