Pressure blowout tool for grease injection valve

Abstract

A pressure blowout tool for a grease injection valve relates to the technical field of grease injection valve release devices and comprises a shell, a sealing assembly and an ejector rod used for ejecting a sealing steel ball of the grease injection valve to release pressure. The sealing assembly comprises a connecting nut used for being in threaded connection with the grease injection valve and a sealing plug used for sealing the grease injection opening, and the connecting nut covers the sealing plug. The sealing plug is in a circular truncated cone shape and is provided with a through hole penetrating through the large circular face and the small circular face. The ejector rod is arranged in the shell and can stretch out along the through hole, and the diameter of the ejector rod is smaller than the hole diameter of the through hole. The circular-truncated-cone-shaped sealing plug is in butt joint with the inverted-cone-shaped grease injection opening through the connecting nut for sealing, then the ejector rod extends out to eject the steel ball to complete pressure relief, sealing adhesive tape is prevented from being wound on metric threads, efficiency is improved, and use cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of grease injection valve discharge devices, and particularly relates to a pressure release tool for a grease injection valve with pressure Background Art

[0002] The grease injection valve is usually installed at the rotating part of the valve stem of the valve. When the rotation lubrication of the valve stem is abnormal, lubricating oil or grease can be injected through this grease injection valve to play a role in rotating lubrication of the valve stem.

[0003] Patent Publication No. CN109340415A discloses a grease injection valve. By designing the grease injection port into an inverted cone shape and setting a conical plug to seal the inverted cone-shaped grease injection port, it can not only play a dust-proof role but also form a secondary seal, that is, when the steel ball seal fails, leakage can be avoided based on the formed secondary seal. Therefore, it has a high market share.

[0004] However, the existing pressure release tool for the grease injection valve is connected to the grease injection valve by metric threads. To avoid leakage from the metric thread connection when high-pressure medium is released, the operator needs to wrap sealing tape around the metric threads. However, this method is not only time-consuming and laborious but also increases the tape cost. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a pressure release tool for a grease injection valve to solve the technical problem of how to perform pressure release on a grease injection valve with a conical grease injection port.

[0006] This application discloses a pressure release tool for a grease injection valve, including a housing, a sealing assembly, and a push rod for pushing open the sealing steel ball of the grease injection valve to release pressure; the sealing assembly includes a connection nut for threaded connection with the grease injection valve and a sealing plug for sealing the grease injection port, and the connection nut encloses the sealing plug; the sealing plug is in a frustum shape, and the sealing plug is provided with a through hole penetrating the large circular surface and the small circular surface; the push rod is arranged in the housing and can extend out along the through hole.

[0007] In some possible implementation manners, the sealing assembly further includes a connecting pipe. One end of the connecting pipe is connected to the large circular surface of the sealing plug, the other end of the connecting pipe is connected to the housing, the connection nut is provided with a through hole for the connecting pipe to pass through, the diameter of the through hole is larger than the outer diameter of the connecting pipe, and the diameter of the through hole is smaller than the diameter of the large circular surface of the sealing plug.

[0008] In some possible implementation manners, the connecting pipe is integrally provided with the sealing plug, and the connecting pipe is threadedly connected to the housing in a sealed manner.

[0009] In some possible implementation manners, the material of the sealing plug is 304.

[0010] In some possible embodiments, the ejector rod is threadedly connected to the housing, a sealing packing is arranged between the ejector rod and the housing, one end of the ejector rod away from the sealing plug extends out of the housing, and a handle for rotating the ejector rod is arranged at one end of the ejector rod away from the sealing plug.

[0011] In some possible embodiments, the ejector rod is further provided with a limiting block.

[0012] In some possible embodiments, the limiting block is in an umbrella shape and is coaxially arranged with the valve rod.

[0013] Beneficial effects: The conical sealing plug is docked on the inverted conical grease injection port through the connecting nut for sealing, and then the ejector rod is extended to push open the steel ball, and the high-pressure oil and gas in the grease injection valve flow out along the gap between the ejector rod and the hole wall of the through hole, so as to complete pressure relief, avoiding winding sealing tape on the thread of the grease injection valve, improving the efficiency and reducing the use cost.

[0014] Other advantages, objectives and features of the present application will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present application. The objectives and other advantages of the present application can be realized and obtained through the following specification. Description of the Drawings

[0015] The embodiments described below with reference to the drawings are exemplary and are intended to explain and illustrate the present application, and should not be construed as a limitation on the protection scope of the present application.

[0016] Figure 1 is a schematic diagram of the pressure-relief blowout tool for the grease injection valve of the present application;

[0017] Wherein: 1. Housing; 2. Connecting nut; 3. Sealing plug; 4. Ejector rod; 5. Connecting pipe; 6. Air outlet; 7. First packing; 8. Second packing; 9. Third packing; 10. Fourth packing; 11. Packing gland; 12. Handle; 13. Compression nut; 21. Through hole; 41. Limiting block. Detailed Embodiments

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, 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.

[0019] Accordingly, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0020] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0021] In the above description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "one side" and "the other side" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application. In addition, terms such as "first" and "second" are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0022] In addition, terms such as "the same" do not mean that the components are required to be absolutely the same, but there may be slight differences. The term "vertical" only means that the positional relationship between components is more vertical relative to "parallel", and does not mean that the structure must be completely vertical, but may be slightly inclined.

[0023] As Figure 1 shown, the present application discloses a grease injection valve pressure-relief spraying tool under pressure, which includes a housing 1, a sealing assembly, and a push rod 4 for pushing open the sealing steel ball of the grease injection valve to relieve pressure. Among them, the housing is provided with an air outlet 6. The sealing assembly includes a connecting nut 2 for threaded connection with the grease injection valve and a sealing plug 3 for sealing the inverted conical grease injection port. The connecting nut 2 covers the sealing plug 3. The sealing plug 3 is frustum-shaped, and the sealing plug 3 is provided with a through hole penetrating the large circular surface and the small circular surface of the sealing plug. The push rod 4 is arranged in the housing 1 and can extend out along the through hole.

[0024] The frustum-shaped sealing plug is butt-jointed to the inverted conical grease injection port through the connecting nut for sealing. Then, the push rod is extended to push open the steel ball, and the high-pressure oil and gas in the grease injection valve enter the housing along the gap between the push rod and the hole wall of the through hole and then flow out through the air outlet provided on the housing, thereby completing pressure relief, avoiding winding sealing tape on the thread of the grease injection valve, improving efficiency, and reducing the use cost.

[0025] In some embodiments, the sealing plug 3 and the connecting nut 2 can be fixedly connected or have a clearance fit. In this embodiment, the sealing assembly further includes a connecting pipe 5. One end of the connecting pipe 5 is connected to the large circular surface of the sealing plug 2, and the other end of the connecting pipe 5 is connected to the housing 1. The connecting nut 2 is provided with a through hole 21 for the connecting pipe 5 to pass through. The diameter of the through hole 21 is greater than the outer diameter of the connecting pipe 5, and the diameter of the through hole 21 is less than the diameter of the large circular surface of the sealing plug 3. A clearance fit is formed by arranging the connecting pipe 5 and connecting it through the connecting nut 2 to the sealing plug 3. The clearance between the connecting pipe 5 and the through hole 21 in the radial direction of the connecting pipe 5 is 0.2 mm - 0.3 mm. By providing a clearance between the through hole 21 and the connecting pipe 5, when the connecting nut 2 is tightened and connected to the grease injection valve, the sealing plug 3 can automatically adjust its position based on the guiding effect of the shape of the grease injection port and seal on the grease injection port. Compared with the fixed connection between the sealing plug 3 and the connecting nut 2, the influence of the coaxiality between the grease injection port and the sealing plug 3 during the machining process on the sealing performance is avoided, and the sealing performance of the sealing plug 3 is improved. The connection between the connecting pipe 5 and the housing 1 is a sealed threaded connection; the sealed threaded connection can adopt a 1 / 2 NPT threaded connection. The material of the sealing plug 3 is 304. Since in a high-temperature, high-pressure and corrosive environment, the valve body of the grease injection valve uses chromium-containing alloy steel, by setting the material of the sealing plug 3 to 304 stainless steel, not only can the corrosive environment be satisfied, but also because 304 stainless steel is softer than chromium-containing alloy steel, the cooperation between this soft and hard can further improve the sealing performance between the sealing plug and the grease injection valve.

[0026] In some embodiments, the push rod 4 is threadedly connected to the shell 1, a sealing filler is arranged between the push rod 4 and the shell 1, the end of the push rod 4 away from the sealing plug extends out of the shell 1, and the end of the push rod 4 away from the sealing plug 3 is provided with a handle 12 for rotating the push rod 4, specifically: an external thread is arranged on the rod body of the push rod 4, the shell 1 is provided with an internal thread matching the external thread of the push rod 4, a sealing filler is arranged on the side of the internal thread of the shell away from the sealing plug, the sealing filler is sleeved on the push rod, and a clamping nut 13 and a packing pressure ring 11 are provided, and the packing pressure ring 11 is pressurized by the clamping nut 13 to expand the sealing filler to achieve sealing, and the push rod 4 is provided with an external thread, the shell is provided with an internal thread matching the external thread, a sealing packing is provided on the side of the shell internal thread away from the sealing plug, and a clamping nut 13 and a packing pressing ring 11 are provided, which is not only convenient for assembly, but also when the initial spray is performed, the high-pressure oil and gas of up to 100Mpa in the grease injection valve rushes to the end of the handle 12, and the high-pressure oil and gas of 100Mpa are blocked by the thread, thereby reducing the effect of the high-pressure oil and gas on the sealing packing, and improving the durability of the sealing packing, and the valve stem 4 is only threadedly connected to the shell 1, and after the clamping nut 13 is tightened, the rotation of the valve stem will not affect the stability of the clamping nut 13 and the packing pressing ring 11, thereby ensuring the sealing of the sealing packing. The sealing filler includes a first filler 7, a second filler 8, a third filler 9 and a fourth filler 10. As shown in the figure, the first filler 7, the second filler 8, the third filler 9 and the fourth filler 10 are arranged in order from low to high. The first filler 7, the second filler 8, the third filler 9 and the fourth filler 10 are all annular, one end of the first filler 7 is a plane, and the other end is a convex; one end of the second filler 8 and the third filler 9 is a concave surface, and the other end is a convex surface; one end of the fourth filler 10 is a concave surface, and the other end is a plane, the convex surface of the first filler 7 is embedded in the concave surface of the second filler 8, the convex surface of the second filler 8 is embedded in the concave surface of the third filler 9, and the convex surface of the third filler 9 is embedded in the concave surface of the fourth filler 10, the angle of the convex surface is 105 degrees, and the angle of the concave surface is 90 degrees; the material of the first filler 7, the second filler 8, the third filler 9 and the fourth filler 10 are all PTFE+CF material, PTFE+CF material is a composite material composed of polytetrafluoroethylene and carbon fiber.

[0027] In some embodiments, the ejector rod 4 is further provided with a limit block 41. The outer extension distance of the limit block 41 is greater than the outer thread diameter of the ejector rod 4, which prevents the ejector rod from disengaging from the housing, improving the stability of the blowout preventer tool. The limit block 41 is umbrella-shaped and coaxially arranged with the valve rod 4, so that the limit block 41 can shield the threaded connection between the ejector rod 4 and the housing 1. In this embodiment, the air outlet 6 is arranged on the vertical surface of the housing 1. When initial blowout occurs, the high-pressure oil and gas up to 100 Mpa in the grease injection valve rush towards the handle end. There will be particulate impurities in the high-pressure oil and gas of 100 Mpa. For example, to improve the recovery rate of sandstone oilfields, the method of water injection for exploitation is adopted. However, during the process of water injection for exploitation, a large amount of particulate impurities such as sediment in the formation will be produced together with the crude oil. These particles are mixed in the high-pressure oil and gas of 100 Mpa and rush towards the threaded connection between the ejector rod 4 and the housing 1. By providing the umbrella-shaped limit block 41, the limit block 41 can shield the threaded connection between the ejector rod 4 and the housing 1, preventing particulate impurities from impacting and embedding into the threaded connection between the ejector rod 4 and the housing 1.

[0028] Those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments.

[0029] Those skilled in the art can understand that the descriptions of the various embodiments have their respective emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0030] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application. Such modifications and variations all fall within the scope defined by the appended claims. The above is only the specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A grease injection valve with pressure release spray tool, characterized in that: It includes a shell, a sealing assembly and a push rod for pushing open the grease injection valve to release the pressure of the sealing steel ball; the sealing assembly includes a connecting nut for threaded connection with the grease injection valve and a sealing plug for sealing the inverted cone grease injection port, and the connecting nut covers the sealing plug; the sealing plug is truncated cone-shaped, and the sealing plug is provided with a through hole penetrating the large circular surface and the small circular surface; the push rod is arranged in the shell and can extend along the through hole.

2. The grease injection valve pressure release spray tool according to claim 1, characterized in that: The sealing assembly also includes a connecting tube, one end of which is connected to the large circular surface of the sealing plug, and the other end of the connecting tube is connected to the shell, and the connecting nut is provided with a through hole for the connecting tube to pass through, the diameter of the through hole is larger than the outer diameter of the connecting tube, and the diameter of the through hole is smaller than the diameter of the large circular surface of the sealing plug.

3. The grease injection valve pressure release spray tool according to claim 2, characterized in that: The connecting pipe and the sealing plug are integrally arranged, and the connecting pipe and the housing are connected by a sealed thread.

4. The grease injection valve pressure release spray tool according to claim 3, characterized in that: The sealing plug is made of 304 material.

5. The grease injection valve pressure release spray tool according to claim 4, characterized in that: The push rod is threadedly connected to the shell, a sealing filler is arranged between the push rod and the shell, one end of the push rod away from the sealing plug extends out of the shell, and the end of the push rod away from the sealing plug is provided with a handle for rotating the push rod.

6. The grease injection valve pressure release spray tool according to claim 5, characterized in that: The top rod is also provided with a limiting block.

7. The grease injection valve pressure release spray tool according to claim 6, characterized in that: The limiting block is umbrella-shaped and is coaxially arranged with the top rod.

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