High sealing grease injection valve nut plug

Abstract

A high-sealing grease injection valve nut plug relates to the technical field of petroleum equipment, comprising a nut and a plug body, wherein an assembly hole is provided on the bottom surface of the nut; the plug body comprises a sealing head and a rod for sealing the grease injection port, the sealing head is provided on the inner side of the nut, the outer diameter of the sealing head is larger than the diameter of the assembly hole, the rod is passed through the assembly hole, one end of the rod is connected to the sealing head, the other end of the rod extends out of the nut and a limiting block is provided, a first gap is provided between the rod and the hole wall of the assembly hole, and a second gap is provided between the sealing head and the bottom surface; when the nut is fastened to the grease injection valve body, the plug body can automatically adjust its position based on the guiding effect of the grease injection port and the gap between the grease injection port and the assembly hole and seal on the grease injection port, thereby avoiding the low coaxiality between the grease injection port and the nut plug during machining to reduce the sealing performance of the nut plug.

Description

Technical Field

[0001] The present application relates to the technical field of petroleum equipment, and in particular to a nut plug for a grease injection valve with high sealing performance. Background Art

[0002] In the field of petroleum equipment, grease injection valves are important cleaning and lubricating devices and are widely used in the lubrication and maintenance of various equipment. By adding lubricating grease to the grease injection port of the grease injection valve, the normal operation of the equipment is ensured and the service life is extended.

[0003] In the publication number CN209245367U, in order to prevent the grease injection port from being exposed to the environment for a long time, a nut plug needs to be provided at the end of the grease injection valve. However, in the prior art, the nut plug is a plug body and a nut part fixedly connected by integral machining. Although this machining process simplifies the production process, it is limited by the machining accuracy of the lathe, which often leads to the coaxiality between the grease injection port and the nut plug being not precise enough, thereby affecting the sealing performance of the nut plug and reducing the sealing performance of the nut plug. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a high-sealing grease injection valve nut plug to solve the technical problem in the prior art that the sealing performance of the nut plug is reduced due to the influence of the coaxiality between the grease injection port and the nut plug.

[0005] The present application discloses a high-sealing grease injection valve nut plug, comprising a nut and a plug body, wherein the bottom surface of the nut is provided with an assembly hole; the plug body comprises a sealing head and a rod for sealing the grease injection port, the sealing head is provided on the inner side of the nut, the outer diameter of the sealing head is larger than the diameter of the assembly hole, the rod is passed through the assembly hole, one end of the rod is connected to the sealing head, the other end of the rod extends out of the nut and is provided with a limiting block, a first gap is provided between the rod and the hole wall of the assembly hole, and a second gap is provided between the sealing head and the bottom surface.

[0006] In some possible implementations, the plug body is made of 304 stainless steel.

[0007] In some possible implementations, the limit block is umbrella-shaped, the limit block is formed by axially stamping the end of the rod portion, and a support plane for stamping support is provided at the end of the sealing head away from the rod portion.

[0008] In some possible implementations, a chamfer for stamping support is provided on one side of the assembly hole close to the free end, and the angle range of the chamfer is 45 degrees to 60 degrees.

[0009] In some possible implementations, a guide hole for punching guide is provided at the end of the rod away from the sealing head, and the wall thickness of the guide hole is 0.2 mm-0.4 mm.

[0010] In some possible implementations, the first gap ranges from 0.2 mm to 0.3 mm, and the second gap ranges from 0.3 mm to 0.4 mm.

[0011] In some possible implementations, the grease injection port is funnel-shaped, and the sealing head is truncated cone-shaped to match the grease injection port.

[0012] Beneficial effect: By setting the nut and the plug body to be a clearance fit, when the nut is tightened on the grease injection valve body, the plug body can automatically adjust its position and seal on the grease injection port based on the guiding effect of the grease injection port and the gap between the assembling hole, thereby avoiding the low coaxiality between the grease injection port and the nut plug during the machining process, which reduces the sealing of the nut plug; and the plug body material and the nut material can be reasonably matched based on the use environment; compared with integral processing, material loss is also reduced.

[0013] Other advantages, objectives and features of the present application will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or can be taught from the practice of the present application to some extent. The objectives and other advantages of the present application can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain and illustrate the present application, but should not be construed as limiting the scope of protection of the present application.

[0015] Figure 1 It is the front view of the nut plug;

[0016] Figure 2 It is a cross-sectional view of the nut plug along AA;

[0017] Figure 3 It is a front view of the plug body;

[0018] Figure 4 It is a cross-sectional view of the plug body along BB;

[0019] Among them: 1. nut; 2. plug body; 11. assembly hole; 12. chamfer; 21. sealing head; 22. rod; 23. guide hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the above description of the present application, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, the term "same" does not mean that the parts must be absolutely the same, but there can be slight differences. The term "vertical" only means that the positional relationship between the parts is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0025] like Figure 1-4As shown, the present application discloses a high-sealing grease injection valve nut plug, comprising a nut 1 and a plug body 2, wherein the bottom surface of the nut 1 is provided with an assembly hole 11; the plug body 2 comprises a sealing head 21 and a rod 22 for sealing the grease injection port, the sealing head 21 is arranged on the inner side of the nut 1, the outer diameter of the sealing head 21 is larger than the diameter of the assembly hole 11, the rod 22 is penetrated in the assembly hole 11, one end of the rod 22 is connected to the sealing head 21, the other end of the rod 22 extends out of the nut 1 and is provided with a limiting block, the diameter of the limiting block is larger than the diameter of the assembly hole 11, and preset gaps are respectively provided between the rod 22 and the assembly hole 11 along the axial direction and radial direction of the rod 22, a first gap is provided between the rod 22 and the hole wall of the assembly hole 11, the first gap is the difference between the outer diameter of the rod 22 and the diameter of the assembly hole 11, and a second gap is provided between the sealing head 21 and the bottom surface. In the overall processing technology, it is necessary to first countersink and then machine the internal thread on the hole wall of the countersunk hole. However, the gap between the hole wall of the small-sized nut and the plug body is relatively small, and cannot accommodate a thread cutter of ordinary size, resulting in the internal thread failing to extend to the hole wall between the end face of the plug body and the bottom of the nut. As a result, during use, the plug body cannot be sealed on the grease injection port, and the structure of the grease injection valve body needs to be optimized to adapt to the nut plug of the overall processing technology. However, the optimization of the grease injection valve body structure will result in the matching of multiple sizes, and the matching of multiple sizes will put forward higher requirements on the processing accuracy, thereby reducing the stability of the seal. The process of separately processing the plug body and the nut and then combining them can avoid the problem that the internal thread cannot extend to the hole wall between the end face of the plug body and the bottom of the nut, thereby improving the stability of the seal. In this embodiment, the grease injection port of the grease injection valve is arranged to be funnel-shaped, the taper range of the grease injection port is 55 degrees-60 degrees, the diameter range of the large end of the grease injection port is 6.9mm-7.1mm, and the diameter range of the small end of the grease injection port is 4.9mm-5.1mm; the range of the second gap between the sealing head 21 and the bottom surface is 0.3mm-0.4mm, and the range of the first gap between the rod 22 and the hole wall of the assembly hole 11 is 0.2mm-0.3mm. The range of the first gap and the range of the second gap can meet the precision control of the lathe, reduce the precision requirements of the lathe for processing the internal thread of the nut and the external thread of the grease injection valve, realize the reasonable configuration and use of low-precision old machine tools, and reduce the production cost investment.

[0026] As mentioned above, the grease injection port of the grease injection valve is set to be funnel-shaped, so the shape of the sealing head 21 is set to be a truncated cone that matches the grease injection port, and the material of the plug body 2 is 304 stainless steel to meet the requirements of high temperature, high pressure and corrosive environment; because the valve body of the grease injection valve will be made of chromium-containing alloy steel under high temperature, high pressure and corrosive environment, by setting the material of the plug body 2 to 304 stainless steel, it can not only meet the corrosive environment, but also because 304 stainless steel is softer than chromium alloy steel, this combination of soft and hard can further improve the sealing between the plug body 2 and the grease injection valve, forming a secondary seal in addition to the steel ball seal inside the grease injection valve, avoiding the leakage of oil and gas through the grease injection port after the steel ball seal in the grease injection valve fails, thereby improving safety. In this embodiment, the limit block is umbrella-shaped, and the limit block is formed by stamping the end of the rod 22. Based on the characteristics of 304 stainless steel, the plug body 2 and the nut 1 are assembled by stamping technology. The assembly by stamping technology not only reduces the processing accuracy requirements, but also improves production efficiency; the end of the rod 22 away from the sealing head 21 is provided with a guide hole 23 for stamping guide, and the wall thickness of the guide hole 23 is 0.2mm-0.4mm; the end of the sealing head 21 away from the rod 22 is provided with a supporting plane for stamping support of the sealing head 21, and the end of the sealing head 21 is set to a plane to support the plug body 2 during the assembly process, so as to avoid damage to the conical surface by the conical surface support of the sealing head, thereby reducing the sealing performance.

[0027] In this embodiment, a chamfer 12 for stamping support is provided on one side of the assembly hole 11 of the nut 1 near the free end, and the angle range of the chamfer 23 is 45 degrees to 60 degrees, so that the stamping surface can be effectively supported during stamping, not only to avoid damage, but also to fix the second gap between the sealing head 21 and the bottom surface based on the chamfer. Before stamping, the support plane of the plug body 2 is placed on the support table of the punching machine so that the plug body 2 is in a vertical state; the nut is covered above the sealing head so that a part of the rod 22 is exposed to the nut; during stamping, the punch head applies pressure downward to 23 through the guide hole at the end of the rod 22, so that the hole wall of the guide hole 23 spreads out and fits on the chamfer 12.

[0028] By setting the nut 1 and the plug body 2 to be clearance-fitted, when the nut 1 is tightened on the grease injection valve body, the plug body 2 can automatically adjust its position and seal on the grease injection port based on the guiding effect of the grease injection port and the gap between the plug body 2 and the assembly hole 11, thereby avoiding the low coaxiality between the grease injection port and the nut plug during the machining process, which reduces the sealing performance of the nut plug; and the plug body material and the nut material can be reasonably matched based on the use environment; compared with integral processing, material loss is also reduced.

[0029] Those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present application and to form different embodiments.

[0030] Those skilled in the art will appreciate that the description of each embodiment has its own emphasis, and for parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0031] Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the attached claims. The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and these modifications or substitutions should be included in the protection scope of the present utility model. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. High sealing grease injection valve nut plug, characterized by: It comprises a nut and a plug body, wherein an assembly hole is arranged on the bottom surface of the nut; the plug body comprises a sealing head and a rod for sealing the grease injection port, the sealing head is arranged on the inner side of the nut, the outer diameter of the sealing head is larger than the diameter of the assembly hole, the rod is passed through the assembly hole, one end of the rod is connected to the sealing head, and the other end of the rod extends out of the nut and is provided with a limiting block; a first gap is arranged between the rod and the hole wall of the assembly hole, and a second gap is arranged between the sealing head and the bottom surface.

2. The high-sealing grease injection valve nut plug according to claim 1 is characterized in that: The material of the plug body is 304 stainless steel.

3. The high-sealing grease injection valve nut plug according to claim 2 is characterized in that: The limit block is umbrella-shaped and is formed by axially stamping the end of the rod portion. The end of the sealing head away from the rod portion is provided with a support plane for stamping support.

4. The high-sealing grease injection valve nut plug according to claim 3 is characterized in that: A chamfer for stamping support is arranged on one side of the assembly hole close to the free end, and the angle range of the chamfer is 45 degrees to 60 degrees.

5. The high-sealing grease injection valve nut plug according to claim 4 is characterized in that: A guide hole for punching guide is arranged at the end of the rod away from the sealing head, and the wall thickness of the guide hole is 0.2mm-0.4mm.

6. The high-sealing grease injection valve nut plug according to claim 5 is characterized in that: The first gap ranges from 0.2 mm to 0.3 mm, and the second gap ranges from 0.3 mm to 0.4 mm.

7. The high-sealing grease injection valve nut plug according to claim 1 is characterized in that: The grease injection port is funnel-shaped, and the sealing head is in a truncated cone shape matching the grease injection port.

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