Pneumatic control valve of oil well pipe clamp

Abstract

The utility model discloses an oil well pipe clamp pneumatic control valve which is characterized in that a valve body is provided with an air inlet and an air outlet, a cavity is arranged in the valve body and communicated with the air inlet and the air outlet, and a middle air inlet bin, a clamping driving bin and a loosening driving bin are arranged in the cavity; a valve element penetrates through the cavity and is provided with a left side sealing area, a middle sealing area and a right side sealing area. A left side conducting part is arranged between the left side sealing area and the middle sealing area; a right side conducting part is arranged between the middle sealing area and the left side sealing area; the valve element is driven by the driving rod to move axially to achieve air supply in the positive direction and the negative direction so as to drive external clamping action. As the conduction amount of the conduction parts on the two sides is small, airflow can be reduced and pressure can be increased during air pressure adjustment, and rapidness and stability of switch control are promoted; end guiding parts are arranged at the two ends of the cavity correspondingly, and the stability of the valve element in the axial movement process is restrained through the end guiding parts.

Description

Technical Field

[0001] This utility model relates to the technical field of oil well pipe clamping control components, specifically to a pneumatic control valve for an oil well pipe clamp. Background Art

[0002] In oil well exploration operations, in order to achieve clamping control of the pipe clamp, a control valve is usually installed on the pneumatic clamping tool. This type of control valve is usually a three-way two-position control valve, which realizes the opening and closing clamping control of the pipe clamp through a single air supply port and two air outlets.

[0003] In this field, existing well clamping control valves have the following technical drawbacks when in use: 1. They are large in size and difficult to install in a small controller; 2. Existing control valves typically do not adjust the gas pressure during clamping control, which can easily lead to clamping instability when low gas pressure is supplied; 3. When the valve core moves axially, the internal rubber ring is not securely fixed, which can easily cause gas pressure leakage during high-pressure operation; 4. When the valve core moves axially, it can only be guided through the valve core cavity, resulting in unstable operation.

[0004] Based on the summary and analysis of the above-mentioned technical status, those skilled in the art should improve the structure of the control valve on the basis of the existing control valve. The purpose is to solve the above-mentioned technical problems encountered in the existing technology and improve the stability of the oil well clamping wrench under pneumatic drive. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pneumatic control valve for oil well clamping wrenches, which controls the valve core movement within a small range by setting a short-stroke drive control, effectively increasing the gas pressure at the outlet end and improving the stability of the valve core axial movement.

[0006] A pneumatic control valve for an oil well clamp includes a valve body with an air inlet and an air outlet. The valve body has an internal chamber that communicates with the air inlet and the air outlet. The internal chamber is further divided into a central air inlet chamber, a clamping drive chamber, and a releasing drive chamber. A sealing element is provided between the central air inlet chamber, the clamping drive chamber, and the releasing drive chamber.

[0007] A valve core passes through the chamber, and the valve core is provided with a left sealing area, a middle sealing area and a right sealing area; a left conducting part is provided between the left sealing area and the middle sealing area; a right conducting part is provided between the middle sealing area and the right sealing area; and end guide parts are provided at both ends of the chamber.

[0008] The valve core is provided with a drive end; the valve body is provided with a drive rod at the first end, and the drive rod hinges are all constrained by torsion springs. The drive rod cooperates with the drive end and overcomes the torsion spring constraint to achieve axial drive of the valve core.

[0009] The drive rod is fixed in the drive compartment by a hinge shaft. A positive torsion spring and a negative torsion spring are provided on the hinge shaft. The drive rod is located between the positive torsion spring and the negative torsion spring. Drive plates are provided on the left and right sides of the drive rod and are fixed to the positive torsion spring and the negative torsion spring respectively.

[0010] The bottom end of the drive rod is provided with a vertical plate, the vertical plate is provided with a drive shaft, and the drive end of the valve core is provided with a vertical plate clearance groove and a drive shaft hinge groove to cooperate with the drive rod.

[0011] The valve core has a process cavity inside, and a prefabricated sleeve runs through the process cavity. The central air inlet chamber, clamping drive chamber, release drive chamber, and seal are all located at the center of the prefabricated sleeve.

[0012] The prefabricated sleeve is provided with two-stage sealing grooves, and the sealing element is embedded in the sealing grooves.

[0013] The end guide portion includes a guide cylinder, and a number of guide protrusions are provided on the inner wall of the guide cylinder to contact the valve core.

[0014] The chamber is provided with several axial protrusions evenly distributed inside, and gas storage grooves are provided between the axial protrusions.

[0015] When the central sealing area is closed, the distance A between the central sealing area and the edge of the sealing element is less than 10 mm.

[0016] The beneficial effects of this utility model are as follows: The valve body is provided with an air inlet and an air outlet. An internal chamber is provided that connects to the air inlet and outlet. The internal chamber is further divided into a central air inlet chamber, a clamping drive chamber, and a releasing drive chamber. A valve core penetrates the chamber, and the valve core is provided with a left sealing area, a central sealing area, and a right sealing area. A left-side guide section is provided between the left and central sealing areas; a right-side guide section is provided between the central and left sealing areas. This utility model achieves air supply in both directions by driving the valve core axially through a drive rod, thereby driving the external clamping action. Because the conduction volume of the guide sections on both sides is small, the airflow can be reduced and the pressure increased during air pressure adjustment, promoting the speed and stability of the switch control. End guide sections are provided at both ends of the chamber, which constrain the smoothness of the valve core's axial movement. This utility model has a simple and compact structure, and the drive rod has a small swing amplitude, making it convenient for installation and operation in confined spaces. Attached Figure Description

[0017] The structure of the device of this utility model will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the three-dimensional disassembled structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the front end structure of the valve body;

[0021] Figure 4 This is a schematic diagram of the valve body tail end structure;

[0022] Figure 5 This is a schematic diagram of the internal axial cross-sectional structure of the valve body;

[0023] Figure 6 This is a schematic diagram of the radial cross-sectional structure inside the valve body;

[0024] Figure 7 This is a schematic diagram of the drive rod assembly structure;

[0025] 1. Valve body; 11. Valve body locking hole; 12. Air inlet; 13. Air outlet I; 14. Air outlet II; 2. Tail end cover; 3. Drive chamber seat; 31. Drive chamber seat locking hole; 32. Drive chamber cover locking hole; 33. Drive rod moving area I; 4. Valve core; 41. Left sealing area; 42. Middle sealing area; 43. Right sealing area; 44. Left guiding part; 45. Right guiding part; 46. Drive end; 47. Drive shaft hinge groove; 48. Vertical plate clearance groove; 5. Drive chamber cover; 51. Hinge shaft; 52. Positive torsion spring. 53. Forward drive plate; 531. Forward protrusion; 54. Reverse torsion spring; 55. Reverse drive plate; 551. Reverse protrusion; 56. Drive rod movable area II; 57. Torsion spring fixing rod; 6. Drive rod; 61. Vertical plate; 62. Drive shaft; 7. Prefabricated sleeve; 71. Clamping drive chamber; 72. Middle air intake chamber; 73. Relaxing drive chamber; 74. Sealing groove; 75. Cold-resistant rubber ring; 76. Axial protrusion; 77. Air storage groove; 8. Tail end guide; 80. Guide cylinder; 81. Guide protrusion; 9. Head end guide. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings.

[0027] Example 1:

[0028] A pneumatic control valve for oil well pipe clamps, as shown in the attached figure, includes a valve body 1 with vertically penetrating valve body locking holes 11. Locking and fixing on the machine platform is achieved through the three valve body locking holes 11. An air inlet 12 is provided on the rear side wall of the valve body 1, and air outlets I 13 and II 14 are symmetrically arranged on the left and right sides of the front side wall of the valve body 1. In this embodiment, with this structural arrangement, air outlet I 13 is used for controlling the air supply to release the oil well pipe clamp, and air outlet II 14 is used for controlling the air supply to clamp the oil well pipe clamp.

[0029] The valve body 1 has an internal chamber connected to the air inlet 12 and two air outlets. The internal chamber includes a central air inlet chamber 72, a clamping drive chamber 71, and a releasing drive chamber 73. A sealing element is provided between the central air inlet chamber 72, the clamping drive chamber 71, and the releasing drive chamber 73. In actual processing, those skilled in the art can axially machine a process cavity inside the valve body. This process cavity can be understood as a square or circular through hole; for ease of processing, a circular through hole is preferred. A prefabricated sleeve 7 is machined on a lathe. The central air inlet chamber 72, the clamping drive chamber 71, the releasing drive chamber 73, and the sealing element are all located at the axial center of the prefabricated sleeve 7. During assembly, the entire prefabricated sleeve 7 is interference-fitted into the process cavity to achieve separate assembly. In this embodiment, a two-stage sealing groove 74 is provided inside the prefabricated sleeve 7. The sealing element is a cold-resistant rubber ring 75, which is embedded in the sealing groove 74. The two-stage sealing grooves 74 are respectively located between the central air intake chamber 72 and the clamping drive chamber 71, and between the central air intake chamber 72 and the release drive chamber 73.

[0030] This utility model also includes a valve core 4 penetrating the chamber. The valve core 4 is provided with a left sealing area 41, a middle sealing area 42, and a right sealing area 43. A left-side guiding part 44 is provided between the left-side sealing area 41 and the middle sealing area 42; a right-side guiding part 45 is provided between the middle sealing area 42 and the right-side sealing area 43; a tail end guide part 8 and a head end guide part 9 are respectively provided at both ends of the chamber. When the valve core 4 is installed through the chamber, its installation structure can be referred to Figure 5 As shown, the tail end guide part 8 and the head end guide part 9 have the same structure. Taking the tail end guide part 8 as an example, it includes a guide cylinder 80. Several guide protrusions 81 are provided on the inner wall of the guide cylinder 80 to contact the valve core 4. When the valve core 4 moves axially, the tail end guide part 8 and the head end guide part 9 respectively realize axial guidance and support, thereby improving the stability of the valve core 4 when moving axially.

[0031] Furthermore, to ensure that this invention can increase the air supply pressure during operation, the structure of the valve core 4 is optimized. The specific assembly method is as follows: Figure 5As shown, when the central sealing area 42 is closed, the distance A between the central sealing area 42 and the edge of the sealing element is less than 10 mm. In this embodiment, a setting of 6 mm is selected. The purpose of this structural setting is to constrain the airflow and increase the gas supply pressure of the valve while reducing the gas flow rate, so as to control the external well clamp more quickly and accurately.

[0032] This utility model has a drive end 46 on the valve core 4; a drive rod 6 is provided at the first end of the valve body 1, a vertical plate 61 is provided at the bottom end of the drive rod 6, a drive shaft 62 is provided through the vertical plate 61, and a vertical plate clearance groove 48 and a drive shaft hinge groove 47 are provided in the drive end 46 to cooperate with the vertical plate 61 and the drive shaft 62 at the bottom end of the drive rod 6.

[0033] In this embodiment, the drive rod 6 is fixed in the drive chamber by a hinge shaft 51. The drive chamber is composed of two parts: a drive chamber base 3 and a drive chamber cover 5. The drive chamber base 3 is provided with a drive chamber base locking hole 31 and is locked to the valve body through the drive chamber base locking hole 31. The drive chamber base 3 is also provided with a drive chamber cover locking hole 32 for locking the drive chamber cover 5. The drive chamber base 3 and the drive chamber cover 5 are combined in the upper region to form a cylindrical structure. The top surface is provided with a drive rod movable area I 33 and a drive rod movable area II 56. The two are combined to form an elliptical hole structure for the drive rod movable area. The drive rod 6 passes through the drive rod movable area to achieve swing drive.

[0034] This invention features a forward torsion spring 52 and a reverse torsion spring 54 fixed on a hinge shaft 51. A drive rod 6 is positioned between the forward torsion spring 52 and the reverse torsion spring 54. A forward drive plate 53 and a reverse drive plate 55 are respectively positioned on the left and right sides of the drive rod 6. The forward drive plate 53 has a forward protrusion 531, and the reverse drive plate 55 has a reverse protrusion 551. A torsion spring fixing rod 57 is provided on the inner side of the drive chamber cover 5, corresponding to the forward torsion spring 52 and the reverse torsion spring 54, to fix the torsion springs. With this structure, when the drive rod 6 is in a vertical position, the forward torsion spring 52 and the reverse torsion spring 54 constrain the drive rod 6. At this time, the valve core 4 is in the following state: Figure 5 As shown, when the operator pushes the drive rod 6 towards the valve body 1, the left guide part 44 connects the middle air intake chamber 72 and the clamping drive chamber 71, thus controlling the external well pipe clamping clamp; when the operator pushes the drive rod 6 in the opposite direction of the valve body 1, the right guide part 45 connects the middle air intake chamber 72 and the release drive chamber 73, thus controlling the external well pipe clamping clamp to release.

[0035] In a further structural extension, during the processing of the prefabricated sleeve 7, the cavity of the prefabricated sleeve 7 is evenly provided with several axial protrusions 76, such as... Figure 6As shown, gas storage grooves 77 are provided between the axial protrusions 76. This structure can increase the gas storage capacity per unit area in the clamping drive chamber 71 and the releasing drive chamber 73 while improving strength. After being connected to an external well pipe clamp, it can increase the instantaneous gas supply, making the response of the external well pipe clamp more rapid and precise.

[0036] The present invention has a simple and compact structure. It adopts a combination method to set the drive chamber at the end of the valve body 1 and reduces the swing amplitude of the drive rod 6, which facilitates installation and operation in a small space.

Claims

1. A pneumatic control valve for an oil well pipe clamp, characterized in that: It includes a valve body with an air inlet and an air outlet. The valve body has a chamber inside that communicates with the air inlet and the air outlet. The chamber is divided into a central air inlet chamber, a clamping drive chamber, and a releasing drive chamber. A sealing element is provided between the central air inlet chamber, the clamping drive chamber, and the releasing drive chamber. A valve core passes through the chamber, and the valve core is provided with a left sealing area, a middle sealing area and a right sealing area; a left conducting part is provided between the left sealing area and the middle sealing area; a right conducting part is provided between the middle sealing area and the right sealing area; and end guide parts are provided at both ends of the chamber. The valve core is provided with a drive end; the valve body is provided with a drive rod at the first end, and the drive rod hinges are all constrained by torsion springs. The drive rod cooperates with the drive end and overcomes the torsion spring constraint to achieve axial drive of the valve core.

2. The pneumatic control valve for oil well clamping wrenches according to claim 1, characterized in that: The drive rod is fixed in the drive compartment by a hinge shaft. A positive torsion spring and a negative torsion spring are provided on the hinge shaft. The drive rod is located between the positive torsion spring and the negative torsion spring. Drive plates are provided on the left and right sides of the drive rod and are fixed to the positive torsion spring and the negative torsion spring respectively.

3. The pneumatic control valve for oil well clamps according to claim 2, characterized in that: The bottom end of the drive rod is provided with a vertical plate, the vertical plate is provided with a drive shaft, and the drive end is provided with a vertical plate clearance groove and a drive shaft hinge groove to cooperate with the drive rod.

4. The pneumatic control valve for oil well clamps according to claim 1, characterized in that: The valve core has a process cavity inside, and a prefabricated sleeve runs through the process cavity. The central air inlet chamber, clamping drive chamber, release drive chamber, and seal are all located at the center of the prefabricated sleeve.

5. The pneumatic control valve for oil well clamping wrenches according to claim 4, characterized in that: The prefabricated sleeve is provided with two-stage sealing grooves, and the sealing element is embedded in the sealing grooves.

6. The pneumatic control valve for oil well clamps according to claim 1, characterized in that: The end guide portion includes a guide cylinder, and a number of guide protrusions are provided on the inner wall of the guide cylinder to contact the valve core.

7. The pneumatic control valve for an oil well clamp according to claim 1, characterized in that: The chamber is provided with several axial protrusions evenly distributed inside, and gas storage grooves are provided between the axial protrusions.

8. The pneumatic control valve for an oil well clamp according to claim 1, characterized in that: When the central sealing area is closed, the distance A between the central sealing area and the edge of the sealing element is less than 10 mm.

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