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CN-122014596-A - High-tightness anti-loose valve cover of drilling pump and mounting method thereof

CN122014596ACN 122014596 ACN122014596 ACN 122014596ACN-122014596-A

Abstract

The invention discloses a high-tightness anti-loosening valve cover of a drilling pump, which comprises a hydraulic cylinder body, wherein a valve port is formed in the surface of the hydraulic cylinder body, the valve port is a stepped hole, a section of thread with large inner diameter of the valve port is connected with a valve cover, a limiting disc is fixedly connected to the outer wall above the thread section of the valve cover, a plurality of limiting holes are formed in the limiting disc, the axes of the limiting holes are parallel to the axis of the valve cover, a locking base is fixed at the top end of the hydraulic cylinder body through bolts, a groove is formed in the side surface of the locking base, the limiting disc is clamped in the groove, a fixing hole is formed in the top surface of the locking base, the fixing hole is communicated with the groove, meanwhile, the fixing hole and the limiting hole are in the same straight line, a fixing pin shaft penetrates through the fixing hole, and the fixing pin shaft penetrates through the limiting hole. According to the invention, through the mechanical anti-loosening structure formed by the locking base and the fixed pin shaft, the problem of valve cover loosening caused by strong vibration of the drilling pump is solved, and the spherical surface structure is arranged, so that the plug is kept in a good centering state, and the sealing performance is enhanced.

Inventors

  • WANG YANGYANG
  • WANG SHENLIANG
  • SHI MENGRUI
  • ZHOU XIAOMING
  • LI YONGFEI
  • QI HAIMEI

Assignees

  • 中油国家油气钻井装备工程技术研究中心有限公司
  • 宝鸡石油机械有限责任公司
  • 中国石油天然气集团有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (9)

  1. 1. The utility model provides a drilling pump high leakproofness check valve gap, its characterized in that, including hydraulic cylinder body (1), valve port (2) have been seted up on hydraulic cylinder body (1) surface, and valve port (2) are the shoulder hole, one section threaded connection that valve port (2) internal diameter is big has valve gap (3), fixedly connected with spacing dish (4) on the outer wall of valve gap (3) screw thread section top, a plurality of spacing hole (5) have been seted up on spacing dish (4), the axis of spacing hole (5) is all parallel with valve gap (3) axis, hydraulic cylinder body (1) top is through bolt fastening has locking base (6), recess (7) have been seted up to the side of locking base (6), spacing dish (4) joint is in recess (7), fixed orifices (8) and recess (7) intercommunication are seted up to the top surface of locking base (6), and fixed orifices (8) and spacing hole (5) are on same straight line simultaneously, fixed pin axle (9) have been run through in fixed orifices (8), and fixed pin axle (9) pass spacing hole (5).
  2. 2. The high-tightness anti-loosening valve cover of the drilling pump according to claim 1, wherein the valve cover (3) is in a barrel shape with an upward opening, four round holes (10) are formed in the outer wall of the valve cover (3) above the limiting disc (4), the axes of the adjacent round holes (10) are mutually perpendicular, the valve cover (3) is connected with the hydraulic cylinder body (1) through trapezoidal threads, and the lower end face of the valve cover (3) is a convex spherical surface.
  3. 3. The high-tightness anti-loosening valve cover of the drilling pump according to claim 2, wherein a plug (11) is abutted against the lower portion of the valve cover (3), a plurality of sealing rings (12) are arranged between the plug (11) and the inner wall of the valve port (2), and the sealing rings (12) are rectangular sealing rings.
  4. 4. A high tightness check valve cover for a drill pump according to claim 3, characterized in that the plug (11) is T-shaped with a top radius larger than the smallest radius of the valve port (2).
  5. 5. The high-tightness anti-loosening valve cover of the drilling pump according to claim 1, wherein a screw hole (13) is formed in the side surface of the locking base (6) along the length direction of the groove (7), the screw hole (13) is communicated with the fixing hole (8), and a limiting screw (14) is arranged in the screw hole (13).
  6. 6. The high-tightness anti-loosening valve cover of the drilling pump according to claim 5, wherein screw holes (13) are formed in two sides of the groove (7), and the extending direction of the screw holes (13) from the locking base (6) to the fixing hole (8) is opposite to the rotating direction when the valve cover (3) is screwed out of the valve port (2).
  7. 7. The high-tightness anti-loosening valve cover of the drilling pump according to claim 1, wherein a group of guard plate bases (15) are fixedly connected to the top end of the locking base (6) at two sides of the fixing hole (8) respectively, each guard plate base (15) is composed of two fixing blocks which are oppositely arranged, a protection pin shaft (16) penetrates between the two fixing blocks of each guard plate base (15), guard plates (17) are fixedly connected between the two guard plate bases (15) through the protection pin shaft (16), and a bolt (18) is inserted at one end of each protection pin shaft (16).
  8. 8. The high-tightness check valve cover of the drilling pump according to claim 1, wherein the fixing hole (8) is a runway-shaped through hole, and the length of the fixing hole (8) is not less than the farthest distance of the outer edges of the two adjacent limiting holes (5).
  9. 9. The method for installing the anti-loose valve cover according to claim 1 to 8 is characterized by comprising the following steps: Step 1, pressing a plurality of sealing rings (12) into a valve port (2), sleeving a single sealing ring (12) on the outer side of a cylinder in the middle of a plug (11), and plugging the plug (11) into the valve port (2); step 2, manually screwing the valve cover (3) into the valve port (2), then inserting the lever into two symmetrical round holes (10) on the valve cover (3), and rotating the lever by taking the valve cover (3) as the center until the valve cover (3) cannot rotate; step 3, clamping the locking base (6) on the outer side of the limiting disc (4) through the groove (7), and then fixing the locking base (6) on the hydraulic cylinder body (1) through bolts; step 4, taking down a bolt (18) on the protection pin shaft (16) at one side, drawing out the protection pin shaft (16) from the guard plate base (15), opening the guard plate (17) by taking the protection pin shaft (16) at the other side as a rotating shaft, and then rotating a limit screw (14) to enable the limit screw to withdraw from the fixing hole (8); Step 5, inserting the fixed pin shaft (9) into the limit hole (5) through the fixed hole (8), and then screwing the limit screw (14) to one side of the fixed hole (8) until the limit screw (14) is tightly attached to the fixed pin shaft (9); And 6, closing the guard plate (17), inserting the extracted guard pin shaft (16) into the guard plate base (15), and fixing the guard plate base through the bolt (18).

Description

High-tightness anti-loose valve cover of drilling pump and mounting method thereof Technical Field The invention belongs to the technical field of petroleum and natural gas drilling equipment, relates to a high-tightness check valve cover of a drilling pump, and further relates to an installation method of the high-tightness check valve cover of the drilling pump. Background The drilling pump is a device for conveying circulating high-pressure drilling fluid to the bottom of a well in the petroleum exploitation process, is mainly used for flushing the bottom of the well, breaking rocks, cooling and lubricating a drill bit, carrying rock fragments back to the ground, is core equipment for drilling operation, and has a hydraulic end directly contacted with mud slurry and pressurized and conveyed, so that the inner cavity of a hydraulic cylinder is filled with the high-pressure mud for a long time, and sealing work of the hydraulic end is required to be performed in order to ensure efficient pumping of the mud slurry. The valve cover is arranged on the inner hole of the hydraulic cylinder in the hydraulic cylinder of the drilling pump, a guide channel is provided for opening and closing the pump valve, meanwhile, the inner hole needs to be sealed in the forward running process to prevent slurry from leaking, the inner pressure alternating load of fluid is continuously born, the working condition is complex, and the problem of sealing failure is easy to generate. The valve cover is in threaded connection with the hydraulic cylinder, the vibration phenomenon of the hydraulic end is obvious due to the fluid pulse effect, the probability of screw loosening between the valve cover and the hydraulic cylinder is high, the sealing failure is also caused, and if the sealing failure causes the problems of valve cover puncture leakage or high-pressure slurry ejection, the large economic loss and time cost can be generated, so that the sealing treatment is needed at the valve cover. The sealing mode that the valve gap department of the drilling pump generally adopted among the prior art is to adopt O type circle or rectangular sealing washer that material performance is good to seal, can guarantee the leakproofness when the fluid end vibration is unobvious like this, and the valve gap passes through trapezoidal threaded connection simultaneously, in order to improve the locking nature, also adopts the design of little pitch, has improved to not hard up phenomenon like this, has improved sealing performance, but when the strong vibration phenomenon appears in the drilling pump fluid end the valve gap still has great not hard up risk, leads to sealed inefficacy easily, causes unnecessary loss. Disclosure of Invention The invention aims to provide a high-tightness anti-loosening valve cover of a drilling pump, which solves the problem that in the prior art, when a strong vibration phenomenon occurs at a hydraulic end of the drilling pump, the valve cover is easily loosened with a valve body, so that the sealing is invalid. Another object of the invention is to provide a method of installing a high tightness check valve cover for a drill pump. The technical scheme includes that the hydraulic cylinder comprises a hydraulic cylinder body, a valve port is formed in the surface of the hydraulic cylinder body, the valve port is a stepped hole, a section of thread with the large inner diameter of the valve port is connected with a valve cover, a limiting disc is fixedly connected to the outer wall above the threaded section of the valve cover, a plurality of limiting holes are formed in the limiting disc, the axes of the limiting holes are parallel to the axis of the valve cover, a locking base is fixedly arranged at the top end of the hydraulic cylinder body through bolts, a groove is formed in the side face of the locking base, the limiting disc is clamped in the groove, a fixing hole is formed in the top face of the locking base, the fixing hole is communicated with the groove, meanwhile, the fixing hole and the limiting hole are in the same straight line, a fixing pin shaft penetrates through the fixing hole, and the fixing pin shaft penetrates through the limiting hole. The invention is also characterized in that: the valve cover is in a barrel shape with an upward opening, four round holes are formed in the outer wall of the valve cover above the limiting disc, the axes of the adjacent round holes are mutually perpendicular, the valve cover is connected with the cylinder body through trapezoidal threads, and the lower end face of the valve cover is an outer convex spherical surface. The lower part of the valve cover is jointed and abutted with a plug, a plurality of sealing rings are arranged between the plug and the inner wall of the valve port, and the sealing rings are rectangular sealing rings. The plug is T-shaped, and the top radius of the plug is larger than the minimum radius of the valve port. The side of the locking