A device for dismounting a choke under pressure

Abstract

The utility model belongs to the field of wrench, especially an oil nozzle pressure dismounting device. In order to improve the safety of dismounting the oil nozzle under pressure, the utility model provides an oil nozzle pressure dismounting device, which comprises an operating rod, a pressure relief plug and a wrench head connected to one end of the operating rod and used for driving the oil nozzle to rotate, the pressure relief plug comprises a pressure relief cylinder used for being threadedly connected with the oil nozzle sleeve, the operating rod is sealingly matched with the pressure relief plug, the pressure relief plug is provided with a pressure relief hole, the pressure relief hole is used for connecting the outer space of the pressure relief plug and the annular space between the operating rod and the pressure relief cylinder, the oil nozzle pressure dismounting device further comprises a throttling pressure reduction structure located upstream of the pressure relief hole, the throttling pressure reduction structure is connected to the operating rod and / or the pressure relief cylinder, and the throttling pressure reduction structure satisfies that the flow area of the corresponding part of the throttling pressure reduction structure is smaller than the flow area of the annular space between the operating rod and the pressure relief cylinder. Throttling is performed on the path of oil and gas flow to reduce the pressure when the oil and gas is sprayed from the pressure relief hole, so that the oil and gas can be prevented from injuring people.

Description

Technical Field

[0001] This utility model belongs to the field of wrenches, and in particular relates to a pressure disassembly device for oil nozzles. Background Technology

[0002] When disassembling an oil nozzle, residual pressure inside the nozzle can cause oil vapor to spray out and injure people at the moment of removal. To avoid this, Chinese utility model patent CN207171898U, authorized on April 3, 2018, discloses an oil nozzle wrench. This wrench includes a rod (equivalent to an operating rod), a pressure relief cylinder, and a sleeve with a T-slot (equivalent to a wrench head for rotating the oil nozzle). One end of the rod is fixedly connected to the sleeve, and one end of the pressure relief cylinder has a thread for threaded connection with the oil nozzle. The pressure relief cylinder also has a through hole for the rod to pass through, which is sealed to the rod. The pressure relief cylinder has a pressure relief hole, and a pressure relief annulus is formed between the rod and the inner wall of the pressure relief cylinder, communicating with the pressure relief hole.

[0003] When using it, first, remove the plug connected to the nozzle sleeve and thread the pressure relief cylinder onto the nozzle sleeve, while ensuring the pressure relief hole faces the ground; then, move the rod to engage the sleeve with the nozzle; next, rotate the end of the rod outside the nozzle sleeve so that the rod rotates the nozzle through the sleeve to remove the nozzle, thus preventing the nozzle from flying out and injuring people under the pressure of oil and gas, and improving safety.

[0004] When the nozzle is removed, the high-pressure oil and gas ejected from the nozzle sleeve will be sprayed downwards to the ground through the annulus between the rod and the nozzle sleeve, the annulus between the rod and the pressure relief cylinder, and the pressure relief hole, thus preventing the high-pressure oil and gas from spraying onto people, avoiding injury from the high-pressure oil and gas, and improving safety.

[0005] When using the aforementioned oil nozzle wrench, the high-pressure oil and gas are sprayed downwards from the pressure relief hole to avoid injury. However, in actual operation, because the oil nozzle sleeve is threadedly connected to the pressure relief cylinder, the operator cannot accurately point the pressure relief hole directly downwards. The pressure relief hole often points to the lower left or lower right, and the high-pressure oil and gas sprayed from the pressure relief hole may still cause injury, posing a safety hazard. Utility Model Content

[0006] The purpose of this utility model is to provide a pressure-operated disassembly device for oil nozzles, so as to solve the technical problem that there are still safety hazards when using existing oil nozzle wrenches.

[0007] To achieve the above objectives, the technical solution of the pressure-operated nozzle disassembly device provided by this utility model is as follows:

[0008] A pressure-operated nozzle disassembly device includes an operating rod, a pressure relief plug, and a wrench head connected to one end of the operating rod for rotating the nozzle. The pressure relief plug includes a pressure relief cylinder for threaded connection with the nozzle. The operating rod is sealed to the pressure relief plug. The pressure relief plug has a pressure relief hole for connecting the external space of the pressure relief plug and the annulus between the operating rod and the pressure relief cylinder. The device also includes a throttling and pressure-reducing structure located upstream of the pressure relief hole. The throttling and pressure-reducing structure is connected to the operating rod and / or the pressure relief cylinder, and the throttling and pressure-reducing structure satisfies the following condition: the flow area of ​​the corresponding part of the throttling and pressure-reducing structure is smaller than the flow area of ​​the annulus between the operating rod and the pressure relief cylinder.

[0009] Furthermore, the throttling and pressure-reducing structure includes a spring and a movable sleeve fitted outside the wrench head. The operating rod includes a rod body and a spring retaining ring connected to the outer circumferential surface of the rod body. The spring is installed between the movable sleeve and the spring retaining ring. The wrench head is located inside the movable sleeve. A pressure-reducing hole is opened on the outer circumferential surface of the movable sleeve, connecting the internal space of the movable sleeve and the external space of the movable sleeve. The total flow area of ​​the pressure-reducing hole is smaller than the flow area of ​​the annulus between the operating rod and the pressure relief cylinder.

[0010] Furthermore, the movable sleeve includes a cylinder and a limiting ring connected to the end of the cylinder near the spring. The operating lever passes through the limiting ring, which is located between the wrench head and the spring retaining ring. The spring is compressed between the limiting ring and the spring retaining ring, and the inner diameter of the limiting ring satisfies the following condition: the limiting ring cooperates with the wrench head stop to limit the maximum length of the spring.

[0011] Furthermore, the throttling and pressure-reducing structure includes a first flow-limiting protrusion disposed on the inner wall of the pressure relief cylinder to reduce the flow area between the pressure relief cylinder and the operating rod.

[0012] Furthermore, the first current-limiting protrusion is an annular protrusion.

[0013] Furthermore, the throttling and pressure-reducing structure includes a second flow-limiting protrusion disposed on the outer circumferential surface of the operating lever. The second flow-limiting protrusion is located between the operating lever and the pressure relief cylinder to reduce the flow area between the pressure relief cylinder and the operating lever.

[0014] Furthermore, the second current-limiting protrusion is an annular protrusion.

[0015] Furthermore, the pressure relief plug also includes a throttling cylinder fixedly connected to the pressure relief cylinder. The inner diameter of the throttling cylinder is smaller than the inner diameter of the pressure relief cylinder. The pressure relief hole is located on the throttling cylinder, and the portion of the throttling cylinder upstream of the pressure relief hole constitutes the aforementioned throttling and pressure reduction structure.

[0016] Furthermore, the pressure relief plug is provided with a pressure tap for installing a pressure gauge, and the pressure tap is connected to the annulus between the operating rod and the pressure relief cylinder.

[0017] Furthermore, the pressure tap and the pressure relief hole are located on opposite sides of the pressure relief plug.

[0018] The beneficial effects of the pressurized nozzle disassembly device provided by this utility model are as follows: This utility model is an improved invention. The core difference between this utility model and the prior art is that this utility model also includes a throttling and pressure-reducing structure, which reduces the pressure of the oil and gas flowing out of the pressure relief hole by reducing the flow area, so as to prevent oil and gas from injuring people at the source.

[0019] Based on the aforementioned key differences, when using the pressure-operated nozzle disassembly device of this invention to disassemble the nozzle, the high-pressure oil and gas ejected from the nozzle sleeve will be reduced in pressure by the throttling and pressure-reducing structure, thereby preventing oil and gas from causing injury. At this time, the pressure relief hole can be oriented in any direction.

[0020] The following section describes the beneficial effects of the pressure-operated nozzle disassembly device of this utility model in conjunction with specific usage.

[0021] First, remove the plug from the nozzle sleeve and connect the pressure relief cylinder to the nozzle sleeve threadedly. Next, move the operating lever to engage the wrench head with the nozzle. Finally, rotate the operating lever to rotate the nozzle, thus removing it. This prevents the nozzle from flying out under high-pressure oil and gas, improving safety. When the nozzle is removed, the high-pressure oil and gas ejected from the nozzle sleeve will pass through the throttling and pressure-reducing structure and flow out through the pressure relief hole, preventing injury from the oil and gas. Attached Figure Description

[0022] Fig. 1 This is a schematic diagram of the pressurized disassembly device for the oil nozzle of this utility model;

[0023] Fig. 2 This is a diagram showing the usage state of the pressure disassembly device for the oil nozzle of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Oil nozzle; 2. Pressure relief port; 3. Adjustable sleeve; 4. Wrench head; 5. Spring; 6. Spring retaining ring; 7. Operating lever; 8. Pressure relief cylinder; 9. First flow limiting protrusion; 10. Throttling cylinder; 11. Pressure tap; 12. Pressure cap; 13. Rotating square; 14. Packing; 15. Pressure relief port; 16. Oil nozzle sleeve. Detailed Implementation

[0026] To address the problems in the background technology, the core inventive concept of this utility model is to throttle the flow of high-pressure oil and gas, thereby reducing the pressure of the oil and gas ejected from the pressure relief hole and preventing oil and gas from injuring people.

[0027] The present invention will be further described in detail below with reference to embodiments of the pressure disassembly device for oil nozzles.

[0028] like Figs. 1-2As shown, in a basic specific implementation, the pressure-removing device for the oil nozzle includes an operating rod 7, a pressure relief plug, and a wrench head 4 connected to one end of the operating rod 7 for driving the oil nozzle 1 to rotate. The pressure relief plug includes a pressure relief cylinder 8 for threaded connection with the oil nozzle sleeve 16. The operating rod 7 is sealed to the pressure relief plug. The pressure relief plug is provided with a pressure relief hole 15, which is used to connect the external space of the pressure relief plug and the annulus between the operating rod 7 and the pressure relief cylinder 8.

[0029] The pressure disassembly device for the oil nozzle also includes a throttling and pressure-reducing structure located upstream of the pressure relief hole 15. The throttling and pressure-reducing structure is connected to the operating rod 7 and / or the pressure relief cylinder 8, and the throttling and pressure-reducing structure satisfies the following condition: the flow area of ​​the corresponding part of the throttling and pressure-reducing structure is smaller than the flow area of ​​the annulus between the operating rod 7 and the pressure relief cylinder 8.

[0030] The pressure relief plug and the operating rod 7 are sealed together by packing 14. The packing 14 is installed on the pressure relief plug, and the gland is threaded or flanged to the pressure relief plug to press the packing 14.

[0031] When using the pressurized nozzle removal device of this invention to remove the nozzle 1, the high-pressure oil and gas ejected from the nozzle sleeve 16 will be reduced in pressure by the throttling and pressure-reducing structure, thereby preventing oil and gas from injuring people. At this time, the pressure relief hole 15 can be oriented in any direction.

[0032] The following section describes the beneficial effects of the pressure-operated nozzle disassembly device of this utility model in conjunction with specific usage.

[0033] First, remove the plug at the nozzle sleeve 16 and connect the pressure relief cylinder 8 to the nozzle sleeve 16 via threads. Then, move the operating lever 7 to engage the wrench head 4 with the nozzle 1. Finally, turn the rotating square 13; the operating lever 7 rotates the wrench head 4, which in turn rotates the nozzle 1, thus removing the nozzle 1. This prevents the nozzle 1 from flying out under high-pressure oil and gas, thus improving safety. When the nozzle 1 is removed, the high-pressure oil and gas ejected from the nozzle sleeve 16 will flow out through the pressure relief hole 15 after passing through the throttling and pressure-reducing structure, thereby preventing injury from the oil and gas.

[0034] In other embodiments, instead of providing a rotating square 13, a handle can be installed at the end of the operating lever 7 away from the wrench head 4, and the operating lever 7 can be rotated by the handle.

[0035] The following is a detailed introduction to the throttling and pressure-reducing structure.

[0036] exist Figs. 1-2 In the embodiment shown, the throttling and pressure-reducing structure is divided into three stages: the first throttling and pressure-reducing structure, the second throttling and pressure-reducing structure, and the third throttling and pressure-reducing structure.

[0037] The first throttling and pressure-reducing structure will be described in detail below.

[0038] The first throttling and pressure-reducing structure includes a spring 5 and a movable sleeve 3 sleeved outside the wrench head 4. The operating rod 7 includes a rod body and a spring retaining ring 6 connected to the outer circumferential surface of the rod body. The spring 5 is installed between the movable sleeve 3 and the spring retaining ring 6. The wrench head 4 is located inside the movable sleeve 3, and a pressure-reducing hole 2 is opened on the outer circumferential surface of the movable sleeve 3 to connect the internal space of the movable sleeve 3 and the external space of the movable sleeve 3. The total flow area of ​​the pressure-reducing hole 2 is smaller than the flow area of ​​the annulus between the operating rod 7 and the pressure relief cylinder 8.

[0039] The spring retaining ring 6 can be fixedly connected to the rod body by welding or other means, or be integrally formed.

[0040] In actual use, after the pressure relief cylinder 8 is threadedly connected to the oil nozzle sleeve 16, firstly, the operating rod 7 is moved inward so that the end of the movable sleeve 3 away from the spring 5 contacts the oil nozzle sleeve 16; then, the operating rod 7 is moved inward again, and the spring 5 is compressed until the wrench head 4 engages with the oil nozzle 1; then, the operating rod 7 is rotated. During the rotation of the operating rod 7, since the oil nozzle 1 is threadedly connected to the oil nozzle sleeve 16, the oil nozzle 1 will slowly move outward, so the operating rod 7 will also slowly move outward. The spring 5 slowly rebounds, and the spring 5 can still ensure that the end of the movable sleeve 3 away from the spring 5 is still in contact with the oil nozzle sleeve 16. During this process, the high-pressure oil gas sprayed from the oil nozzle sleeve 16 will directly enter between the operating rod 7 and the movable sleeve 3, and flow through the pressure reduction hole 2 to the annulus between the operating rod 7 and the pressure relief cylinder 8, thereby achieving the first throttling and pressure reduction.

[0041] In a preferred embodiment, the movable sleeve 3 includes a cylindrical body and a limiting ring connected to the end of the cylindrical body near the spring 5. The operating rod 7 passes through the limiting ring, which is located between the wrench head 4 and the spring retaining ring 6. The spring 5 is compressed between the limiting ring and the spring retaining ring 6, and the inner diameter of the limiting ring satisfies the requirement that the limiting ring and the wrench head 4 stop to limit the maximum length of the spring 5. In this case, the spring 5 only needs to be placed between the limiting ring and the spring retaining ring 6, facilitating assembly. After the movable sleeve 3 is installed, the wrench head 4 and the operating rod 7 can be fixedly connected by welding or threaded connection.

[0042] The limiting ring can be connected to the inner wall of the movable sleeve 3, or it can be connected to the end face of the movable sleeve 3 near the spring 5; Figs. 1-2 In the wrench head 4, there is a cylinder and a regular polygonal hole machined at the end of the cylinder away from the operating lever 7. The outer diameter of the cylinder is larger than the inner diameter of the limiting ring so that the limiting ring is engaged with the stop of the wrench head 4.

[0043] In other embodiments, the wrench head 4 may also include a cuboid and a regular polygonal hole machined at the end of the cuboid away from the operating lever 7, in which case the diagonal of the cuboid is larger than the inner diameter of the limiting ring. Of course, the wrench head 4 may also be an irregular structure, as long as the wrench head 4 cannot pass through the inner hole of the limiting ring so that the limiting ring and the wrench head 4 stop together.

[0044] In other embodiments, the outer diameter of the cylinder can be smaller than the inner diameter of the limiting ring. In this case, both ends of the spring 5 need to be fixedly connected to the spring retaining ring 6 and the movable sleeve 3 by welding or other means to prevent the movable sleeve 3 from separating from the spring 5.

[0045] The second throttling and pressure-reducing structure will be described in detail below.

[0046] exist Figs. 1-2 In the embodiment shown, the second throttling and pressure-reducing structure includes a first flow-limiting protrusion 9 disposed on the inner wall of the pressure relief cylinder 8, which is used to reduce the flow area between the pressure relief cylinder 8 and the operating rod 7, thereby reducing the pressure of the oil and gas.

[0047] Preferably, in one embodiment, the first current-limiting protrusion 9 is an annular protrusion, which has a simple structure and good throttling effect.

[0048] In other embodiments, the first current-limiting protrusion 9 may also be a cylindrical protrusion, and there may be multiple first current-limiting protrusions 9, which are evenly distributed on the same circumference.

[0049] In other embodiments, the second throttling and pressure-reducing structure includes a second flow-limiting protrusion disposed on the outer peripheral surface of the operating rod 7. The second flow-limiting protrusion is located between the operating rod 7 and the pressure relief cylinder 8 to reduce the flow area between the pressure relief cylinder 8 and the operating rod 7.

[0050] Preferably, in one embodiment, the second current-limiting protrusion is an annular protrusion, which has a simple structure and good throttling effect.

[0051] In other embodiments, the second current-limiting protrusion may also be a cylindrical protrusion, and there may be multiple second current-limiting protrusions, which are evenly distributed on the same circumference.

[0052] In other embodiments, the first flow-limiting protrusion 9 and the second flow-limiting protrusion can be cuboid protrusions or irregular protrusions, as long as they can reduce the flow area between the operating rod 7 and the pressure relief cylinder 8.

[0053] exist Figs. 1-2 In the embodiment shown, the number of the second throttling and pressure reducing structures is one, that is, the first current limiting protrusion 9 is a ring protrusion (or multiple protrusions evenly distributed on the same circumference).

[0054] In other embodiments, the second throttling and pressure-reducing structure may simultaneously include a first flow-limiting protrusion 9 disposed on the inner wall of the pressure relief cylinder 8 and a second flow-limiting protrusion disposed on the outer peripheral surface of the operating rod 7.

[0055] In this invention, the number of the second throttling and pressure-reducing structures can be one, two or more, that is, the number of the first (second) flow-limiting protrusions can be one, two or more arranged along the axial direction of the pressure relief cylinder 8.

[0056] The third throttling and pressure-reducing structure will be described in detail below.

[0057] like Fig. 1 As shown, the pressure relief plug also includes a throttling cylinder 10 fixedly connected to the pressure relief cylinder 8. The inner diameter of the throttling cylinder 10 is smaller than the inner diameter of the pressure relief cylinder 8. The pressure relief hole 15 is located on the throttling cylinder 10, and the portion of the throttling cylinder 10 upstream of the pressure relief hole 15 constitutes the third throttling and pressure reduction structure. The flow area of ​​the annulus between the throttling cylinder 10 and the operating rod 7 is smaller than the flow area between the pressure relief cylinder 8 and the operating rod 7. Oil and gas flow from between the pressure relief cylinder 8 and the operating rod 7 to between the throttling cylinder 10 and the operating rod 7, thereby achieving the third throttling and pressure reduction.

[0058] Those skilled in the art should understand that, in different embodiments, the pressure-reducing nozzle disassembly device may include at least one of the above-mentioned throttling and pressure-reducing structures. Those skilled in the art can set the number of throttling and pressure-reducing structures according to actual needs. When a second throttling and pressure-reducing structure is selected, the number of the second throttling and pressure-reducing structure can also be set as needed, which will not be elaborated here.

[0059] In the above embodiments, the pressure of the oil and gas cannot be monitored; the oil and gas can only be depressurized and released.

[0060] To facilitate monitoring of oil and gas pressure, in one embodiment, such as Fig. 1 As shown, the pressure relief plug is provided with a pressure tap for mounting a pressure gauge, and the pressure tap is in communication with the annular space between the operating rod 7 and the pressure relief cylinder 8. Specifically, a pressure tap 11 is connected to the pressure relief plug, which is in communication with the annular space between the operating rod 7 and the pressure relief cylinder 8, and the liquid outlet of the pressure tap 11 constitutes the pressure tap. The end of the pressure tap 11 away from the pressure relief plug is provided with a thread for threaded connection with the pressure gauge.

[0061] In a preferred embodiment, the pressure tap and the pressure relief hole 15 are located on opposite sides of the pressure relief plug. On the one hand, when the pressure relief hole 15 faces downwards, the pressure tap faces upwards, making it easier for operators to observe the pressure gauge connected to the pressure tap; on the other hand, it also minimizes the risk of oil or gas flowing onto the pressure gauge.

[0062] In other embodiments, when the pressure relief hole 15 is facing downwards, the pressure tap can be located on the left or right side of the pressure relief plug.

[0063] In the utility model, a plug can also be installed at the pressure relief hole 15, and the plug needs to be removed when pressure needs to be released.

[0064] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure-operated nozzle disassembly device, comprising an operating lever, a pressure relief plug, and a wrench head connected to one end of the operating lever for rotating the nozzle, the pressure relief plug including a pressure relief cylinder for threaded connection with the nozzle, the operating lever being in a sealing fit with the pressure relief plug, the pressure relief plug having a pressure relief hole for connecting the external space of the pressure relief plug and the annular space between the operating lever and the pressure relief cylinder, characterized in that, It also includes a throttling and pressure-reducing structure located upstream of the pressure relief hole. The throttling and pressure-reducing structure is connected to the operating rod and / or the pressure relief cylinder, and the throttling and pressure-reducing structure satisfies the following condition: the flow area of ​​the corresponding part of the throttling and pressure-reducing structure is smaller than the flow area of ​​the annulus between the operating rod and the pressure relief cylinder.

2. The pressure-operated nozzle disassembly device as described in claim 1, characterized in that, The throttling and pressure-reducing structure includes a spring and a movable sleeve fitted outside the wrench head. The operating rod includes a rod body and a spring retaining ring connected to the outer circumferential surface of the rod body. The spring is installed between the movable sleeve and the spring retaining ring. The wrench head is located inside the movable sleeve. A pressure-reducing hole is opened on the outer circumferential surface of the movable sleeve, connecting the internal space of the movable sleeve and the external space of the movable sleeve. The total flow area of ​​the pressure-reducing hole is smaller than the flow area of ​​the annulus between the operating rod and the pressure relief cylinder.

3. The pressure-operated nozzle disassembly device as described in claim 2, characterized in that, The movable sleeve includes a cylinder and a limiting ring connected to the end of the cylinder near the spring. The operating lever passes through the limiting ring, which is located between the wrench head and the spring retaining ring. The spring is compressed between the limiting ring and the spring retaining ring, and the inner diameter of the limiting ring satisfies the following condition: the limiting ring cooperates with the wrench head stop to limit the maximum length of the spring.

4. The pressure-operated nozzle disassembly device as described in any one of claims 1 to 3, characterized in that, The throttling and pressure-reducing structure includes a first flow-limiting protrusion disposed on the inner wall of the pressure relief cylinder to reduce the flow area between the pressure relief cylinder and the operating rod.

5. The pressure-operated nozzle disassembly device as described in claim 4, characterized in that, The first current-limiting protrusion is an annular protrusion.

6. The pressure-operated nozzle disassembly device as described in any one of claims 1 to 3, characterized in that, The throttling and pressure-reducing structure includes a second flow-limiting protrusion disposed on the outer circumferential surface of the operating lever. The second flow-limiting protrusion is located between the operating lever and the pressure relief cylinder to reduce the flow area between the pressure relief cylinder and the operating lever.

7. The pressure-operated nozzle disassembly device as described in claim 6, characterized in that, The second current-limiting protrusion is an annular protrusion.

8. The pressure-operated nozzle disassembly device as described in any one of claims 1 to 3, characterized in that, The pressure relief plug also includes a throttling cylinder fixedly connected to the pressure relief cylinder. The inner diameter of the throttling cylinder is smaller than the inner diameter of the pressure relief cylinder. The pressure relief hole is located on the throttling cylinder. The portion of the throttling cylinder upstream of the pressure relief hole constitutes the aforementioned throttling and pressure reduction structure.

9. The pressure-operated nozzle disassembly device as described in any one of claims 1 to 3, characterized in that, The pressure relief plug is equipped with a pressure tap for installing a pressure gauge, and the pressure tap is connected to the annular space between the operating rod and the pressure relief cylinder.

10. The pressure-operated nozzle disassembly device as described in claim 9, characterized in that, The pressure tap and pressure relief hole are located on opposite sides of the pressure relief plug.

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