CN210265445U - Pull rod thread gluing combined nut is prevented for fracturing pump - Google Patents
Pull rod thread gluing combined nut is prevented for fracturing pump Download PDFInfo
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- CN210265445U CN210265445U CN201920504645.7U CN201920504645U CN210265445U CN 210265445 U CN210265445 U CN 210265445U CN 201920504645 U CN201920504645 U CN 201920504645U CN 210265445 U CN210265445 U CN 210265445U
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Abstract
The utility model discloses a tension rod thread gluing prevention combined nut for a fracturing pump, which belongs to the technical field of a fracturing pump hydraulic end supporting device and comprises a pump box and a pull rod, wherein the outer side of the pump box is connected with the pull rod, a thread sleeve on the pull rod is provided with a tensioning nut, the inner thread of the tensioning nut is matched with the pull rod, the outer thread of the tensioning nut is matched with a locking nut, a locking gasket is arranged between the locking nut and the pump box, the locking gasket is sleeved on the tensioning nut, the locking gasket is connected with a spline of the tensioning nut, one end of the locking gasket is jointed with the outer wall of the pump box, the other end of the locking gasket is jointed with the locking nut, the traditional fracturing pump pull rod is improved from the splitting of the tensioning nut into the combination of the tensioning nut and the locking nut to realize the tensioning and the prestress locking of the pull rod, and a locking gasket is added to prevent the tensioning nut from being buckled in work, thereby fundamentally solving the, and the strength requirement and the stability and the reliability of the connection of the pull rod are ensured.
Description
Technical Field
The utility model belongs to the technical field of fracturing pump fluid end strutting arrangement, specifically relate to a fracturing pump is with preventing pull rod thread gluing combination nut.
Background
The fracturing pump consists of a power end (also called a big pump) and a hydraulic end (also called a pressure pump valve box), wherein the hydraulic end is connected and fixed on a shell of the power end through a big pump pull rod. In the operation of the fracturing pump, a power end drives a plunger in a hydraulic end to perform reciprocating linear motion to suck and discharge fracturing fluid by using the working principle that a crankshaft generates reciprocating linear motion so as to realize underground fracturing operation, the hydraulic end can bear high-pressure alternating load, the pull rod is required to have enough connection strength to be practical, connection threads are required to be screwed down during assembly, so that the connection threads are acted by force in advance before bearing the working load, and the applied force is called pretightening force. The pre-tightening force aims to enhance the reliability and tightness of the threaded connection and prevent the connected part from generating gaps or relative slippage after being loaded. Therefore, enough pretightening force is required at the joint of the pull rod nut of the fracturing pump to generate pull rod tension to strain the valve box, and the condition that the pull rod nut is buckled in the working process is avoided, otherwise the fracturing pump cannot work normally, and the fracturing pump can be damaged or even safety accidents are caused.
In order to obtain enough pull rod connection strength and reliability, a large pre-tightening force is provided for a large pump pull rod nut through mechanical tightening (torque T) so as to ensure that the pull rod forms a sufficient tightening force (tension F) in the axial direction, in actual work, the large pre-tightening torque T exists on the thread meshing surface of the screwing threads of the large pump pull rod and the large pump pull rod nut, and a small contact pressure P can be generated on the surface of the screwing thread pair, and the magnitude of the contact pressure P can be obtained through calculation of the following formula (1). Because of the existence of the contact pressure P, T ═ 2 pi μ R2LP (formula 1) (T ═ torque, μ is the contact surface friction coefficient, R is the thread pitch diameter, and L is the thread engagement length), relative slippage (even very slight slippage) of the thread pair along the thread circumferential direction occurs due to vibration during the dismounting and mounting of the draw-bar nut and the operation, and the thread surface may be damaged by surface tearing at the thread engagement surface, which may lead to galling, and the probability of tearing or galling increases as the contact pressure P increases.
Once the thread gluing condition is generated, the pull rod nut cannot be normally installed and disassembled, the normal operation of maintenance work is affected, even the fracturing equipment cannot continue to carry out on-site construction operation, and the output loss of the total power of the equipment is brought to engineering operation. In actual work, after the pull rod nut is fastened, the pull rod nut often has to be disposed by an unconventional means, the pull rod nut is disassembled by using the torque T far exceeding a normal value, and even the pull rod nut has to be destroyed by using modes such as flame cutting, drilling destruction and the like. Either the removal of the nut with an excessive torque T or the destruction of the nut in an abnormal manner can result in substantial damage to the large pump rod.
Because the fracturing pump pull rod nut thread gluing can cause the accidents of blocked maintenance, equipment shutdown, pull rod damage and the like, and brings operational risk, difficult management and small economic loss to construction units, the problem of solving the fracturing pump pull rod nut thread gluing is urgent need of users all the time and is a technical problem to be overcome by a manufacturing enterprise matched with a fracturing pump.
For many years, although many fracturing pump supporting enterprises continuously try to overcome the problem of the pull rod nut thread gluing by means of lifting the material of the pull rod, improving the surface quality of threads, increasing the nominal diameter of the threads, lengthening the screwing length of the threads, improving the screwing lubrication of the threads and the like, the probability of the pull rod nut thread gluing is reduced, but the problem cannot be eliminated all the time.
Disclosure of Invention
The utility model aims to provide a: the utility model provides a fracturing pump is with preventing pull rod thread gluing combination nut (for short antiseized knot nut), the main objective is that on the basis of the pull rod nut of fracturing pump conventional use develop a neotype be used for fracturing pump valve case (or refer to hydraulic end) hookup taut nut, this novel nut can enough provide reliable pull rod hookup take-up intensity (pretightning force promptly), guarantee reliable stable work of fracturing pump valve case under fracturing operation operating mode, can prevent again that pull rod nut department from producing the thread gluing, avoid the pull rod to damage and make things convenient for equipment dimension to protect.
The utility model adopts the technical scheme as follows:
fracturing pump is with preventing pull rod thread gluing combination nut, including pump case and pull rod, the pull rod is connected in the pump case outside, and threaded sleeve is equipped with straining nut on the pull rod, and straining nut's internal thread cooperatees with the pull rod, and straining nut's external screw thread cooperatees with lock nut, is provided with the lock washer between lock nut and the pump case, and the lock washer cover is established on straining nut, lock washer and straining nut spline hookup, lock washer one end and the outer wall of pump case are laminated mutually, and the lock washer other end is laminated mutually with lock nut.
The utility model discloses a further preferred, the range of taut nut installation moment of torsion is 150N.m-250 N.m.
The utility model discloses a further preferred, locking washer is close to one side circumference of pump case and sets up flutedly, and lock nut screws the back, and the locking washer that can make produces elasticity, the plastic deformation of certain degree with the contact surface of pump case.
The utility model discloses a further preferred, lock washer's material adopts normalized alloy structural steel, and yield strength and tensile strength ratio are less than or equal to 0.8, and yield strength sigma s is less than or equal to 600 MPa.
The utility model discloses a further preferred, lock nut pretension moment of torsion's scope 2100N.m-5000 N.m.
The utility model discloses a further preferred, lock nut's screw thread is the thin thread of pressing, and thin tooth screw thread has good self-locking function to let lock gasket play prevent to move back the effect of detaining through compressing tightly lock gasket, can prevent the work of lock nut to move back the knot phenomenon, improve the locking reliability well.
The working principle is as follows: during installation, the tensioning nut (the locking gasket is assembled on the tensioning nut in advance through the spline groove and the clamp spring and faces to the binding surface of the valve box) is screwed down by using a small torque T1, the valve box is tensioned by using a small pull rod tension F1, and because T1 is not large, the contact pressure P1 of the thread tooth binding surface generated during installation of the tensioning nut is not large, so that the thread surface is prevented from being torn, and thread gluing can be avoided;
after the tightening nut is tightened, the locking nut is screwed on the external thread of the tightening nut by using specified large torque T2 to generate enough pretightening force, so that the draw bar obtains draw bar tension F2 meeting design requirements to tighten a valve box (a hydraulic end) completely and reliably, the locking nut compresses a locking gasket completely, the locking gasket generates certain elastic and plastic deformation on two contact surfaces of the locking gasket, the valve box body and the locking nut, and the locking gasket is matched with the tightening nut through a spline, so that the nut can be prevented from being unscrewed in work effectively;
when the anti-sticking nut is disassembled, the locking nut is disassembled by using the torque slightly larger than T2, the tensioning nut can be disassembled by using the torque slightly larger than T1 after the pulling force F2 of the pull rod is disassembled, and the disassembling work of the anti-sticking nut is completed.
Because the nominal diameter of the thread of the lock nut is far larger than that of the thread of the pull rod, the contact pressure P2 generated on the thread tooth and the thread surface of the lock nut according to the formula (1) and the torque T2 can be controlled to a small degree, and the self thread gluing of the lock nut can be prevented.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a with traditional fracturing pump pull rod improve by a straining nut split and realize the taut and prestressing force locking of pull rod for straining nut and lock nut's combination to increase a lock washer and prevent that straining nut from moving back the knot at work, compare with prior art, the utility model has the characteristics of simple structure, practicality are strong, the reliability is high, fundamentally has solved the problem of fracturing pump pull rod nut thread gluing to ensure the intensity requirement and the reliable and stable nature of pull rod hookup.
2. The utility model discloses a set up flutedly in the one side circumference that locking gasket is close to the pump case, lock nut screws the back, and the contact surface of locking gasket that can make and pump case produces elasticity, plastic deformation of certain degree for the area of the one side with the contact of pump case is less than the area with lock nut contact, lock nut can be broken out by priority when making break out, can not drive the back of tightening nut, can prevent to drive the rotation of tightening nut when lock nut breaks out and take place taking place the condition of thread gluing.
3. The thread of the locking nut is a fine-pressing thread, the fine-tooth thread has a good self-locking function, the locking gasket is enabled to play a role of preventing the locking gasket from being unscrewed by pressing the locking gasket, the unscrewing phenomenon of the locking nut in the working process can be well prevented, and the locking reliability is improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural view of the tension nut of the present invention;
fig. 3 is a schematic structural view of the lock washer of the present invention;
fig. 4 is a schematic structural diagram of the a side and the B side of the present invention;
fig. 5 is a schematic structural diagram of the lock nut of the present invention.
Reference numerals: 1-locking gasket, 2-tensioning nut, 3-pull rod, 4-fracturing pump, 5-locking nut, 6-spline groove, 7-spline and 8-groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention, i.e., the described embodiments are merely a few embodiments, rather than all embodiments, and that all features disclosed in this specification, or all methods or process steps disclosed, may be combined in any suitable manner, except for mutually exclusive features and/or steps.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The present invention will be described in detail with reference to fig. 1 to 5.
The first embodiment is as follows: a tension rod 3 thread gluing combination nut for a fracturing pump 4 comprises a pump box and a pull rod 3 and is characterized in that the pull rod 3 is connected to the outer side of the pump box, a tensioning nut 2 is sleeved on a threaded sleeve of the pull rod 3, the installation torque range of the tensioning nut 2 is 150N.m-250N.m, an internal thread of the tensioning nut 2 is matched with the pull rod 3, an external thread of the tensioning nut 2 is matched with a locking nut 5, the pre-tightening torque range of the locking nut 5 is 2100N.m-5000N.m, a locking gasket 1 is arranged between the locking nut 5 and the pump box, the locking gasket 1 is connected with a spline 7 of the tensioning nut 2, the locking gasket 1 is sleeved on the tensioning nut 2, one end of the locking gasket 1 is attached to the outer wall of the pump box, and the other end of the locking gasket 1 is attached to.
The working principle is as follows: during installation, the tensioning nut 2 (the locking gasket 1 is assembled on the tensioning nut 2 in advance through the spline groove 6 and the snap spring and faces the binding surface of the valve box) is screwed down by using a small torque T1, the valve box is tensioned by using a small pull rod 3 through a tension F1, and because T1 is not large, the contact pressure P1 of a thread tooth binding surface generated when the tensioning nut 2 is installed is not large, so that the thread surface is prevented from being torn and thread gluing can be avoided;
after the tightening nut 2 is tightened, the locking nut 5 is screwed on the external thread of the tightening nut 2 by using specified large torque T2 to generate enough pretightening force, the pull rod 3 obtains pull force F2 of the pull rod 3 meeting design requirements to completely and reliably tighten a valve box (a hydraulic end), the locking nut 5 completely compresses the locking gasket 1, the locking gasket 1 generates elastic and plastic deformation to a certain degree on two contact surfaces of the locking gasket 1, a valve box body and the locking nut 5, the locking gasket 1 is matched with the tightening nut 2 through a spline 7, the nut can be effectively prevented from being unscrewed in work, and the installation of the anti-sticking nut is completed through the steps;
when the anti-sticking nut is disassembled, the lock nut 5 is disassembled by using the torque slightly larger than T2, the tensioning nut 2 can be disassembled by using the torque slightly larger than T1 after the pulling force F2 of the pull rod 3 is disassembled, and the disassembling work of the anti-sticking nut is completed.
Because the nominal diameter of the thread of the lock nut 5 is much larger than the diameter of the thread of the pull rod 3, the contact pressure P2 generated by the torque T2 on the tooth and the face of the lock nut 5 according to the formula (1) can be controlled to a small extent, which is also beneficial to preventing the self-sticking of the lock nut 5.
The second embodiment: as shown in fig. 2, which is a schematic structural diagram of the tensioning nut 2, the internal thread of the tensioning nut 2 is in threaded connection with the pull rod 3, the external thread of the tensioning nut 2 is in threaded connection with the locking nut 5, the external thread of the tensioning nut 2 is matched with the locking nut 5 to play a role in pre-tightening and locking, the tensioning nut 2 is provided with a spline groove 6, and the spline groove 6 is matched with the spline 7 of the locking gasket 1 to play a role in anti-back and anti-loose.
The third embodiment is as follows: as shown in fig. 3, the structural diagram of the locking gasket 1 is shown, the material of the locking gasket 1 is normalized alloy structural steel, the ratio of the yield strength to the tensile strength is less than or equal to 0.8, the yield strength σ s is less than or equal to 600MPa, the locking gasket 1 is coupled with the tensioning nut 2 in a spline 7 matching manner, after the locking nut 5 is screwed and locked, the locking gasket 1 can be compressed, the joint surface of the locking nut 5 and the valve box body is smaller, and the groove 8 is formed in the side of the locking gasket 1 close to the pump box, so that the locking gasket 1 can generate larger elastic and plastic deformation, and it is ensured that in the locking state, the locking gasket 1 cannot rotate enough, thereby preventing the situation that the tensioning nut 2 is driven to rotate when the locking nut 5 is screwed and thread gluing occurs, and also preventing the tensioning nut 2 from being unscrewed due to vibration, elastic deformation and the like in work.
The fourth embodiment is as follows: as shown in fig. 4, the stress area of the side a of the locking gasket 1 is compared with the stress area of the side B, when the locking nut 5 is disassembled, because the elastic-plastic deformation of the side a attached to the valve box body of the locking gasket 1 is larger (the area of the side a attached to the flange is smaller than the area of the side B attached to the locking nut 5), the locking nut 5 can be preferentially disassembled, the fastening nut 2 cannot be driven to be disassembled, the situation that the fastening nut 2 is driven to rotate when the locking nut 5 is disassembled and the thread gluing occurs can be prevented, that is, the thread gluing phenomenon occurs when the internal thread of the fastening nut 2 is under a larger pulling force due to the fact that the locking nut 5 drives the fastening nut 2 to rotate.
The fifth embodiment: as shown in fig. 5, the structural schematic diagram of the lock nut 5 is that the lock nut 5 is screwed with the external thread of the tightening nut 2, the box body of the tensioning fracturing pump 4 is ensured to be tightened by using torque during installation to generate large locking pre-tightening torque and axial tension, the thread K2 of the lock nut 5 is designed into a fine thread, the self-locking function is good, the lock gasket 1 is pressed to play a role in preventing the lock gasket from being unscrewed, the unscrewing phenomenon of the lock nut 5 in the work process can be well prevented, and the locking reliability is improved.
The fixed connection, fixed mounting or fixed arrangement mode comprises the existing common technologies, such as bolt fixing, welding, riveting and the like, and all the technologies play a role in fixing without influencing the overall effect of the device.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. Pull rod thread gluing combination nut is prevented for fracturing pump, including pump box and pull rod (3), its characterized in that, pull rod (3) are connected to the pump box outside, threaded sleeve is equipped with straining nut (2) on pull rod (3), the internal thread of straining nut (2) cooperatees with pull rod (3), the external screw thread of straining nut (2) cooperatees with lock nut (5), be provided with lock gasket (1) between lock nut (5) and the pump box, lock gasket (1) cover is established on straining nut (2), lock gasket (1) and straining nut (2) spline (7) hookup, lock gasket (1) one end is laminated with the outer wall of pump box mutually, lock gasket (1) other end and lock nut (5) are laminated mutually.
2. The anti-pull rod thread gluing combination nut for the fracturing pump according to claim 1, wherein the installation torque of the tightening nut (2) is in the range of 150N.m-250 N.m.
3. The anti-pull rod thread gluing combination nut for the fracturing pump according to claim 1, wherein a groove (8) is circumferentially formed in one surface of the locking gasket (1) close to the pump box.
4. The anti-pull rod thread gluing combination nut for the fracturing pump according to claim 1, wherein the material of the locking gasket (1) is normalized alloy structural steel.
5. The anti-pull rod thread gluing combination nut for the fracturing pump according to claim 1, wherein the pre-tightening torque of the lock nut (5) is in a range of 2100N.m-5000 N.m.
6. The anti-pull rod thread gluing combination nut for the fracturing pump according to claim 1, wherein the thread of the locking nut (5) is a fine pressing thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920504645.7U CN210265445U (en) | 2019-04-15 | 2019-04-15 | Pull rod thread gluing combined nut is prevented for fracturing pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920504645.7U CN210265445U (en) | 2019-04-15 | 2019-04-15 | Pull rod thread gluing combined nut is prevented for fracturing pump |
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| Publication Number | Publication Date |
|---|---|
| CN210265445U true CN210265445U (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920504645.7U Active CN210265445U (en) | 2019-04-15 | 2019-04-15 | Pull rod thread gluing combined nut is prevented for fracturing pump |
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| CN (1) | CN210265445U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973504A (en) * | 2019-04-15 | 2019-07-05 | 宝石机械成都装备制造分公司 | The anti-pull rod thread gluing combination nut of fracturing pump |
-
2019
- 2019-04-15 CN CN201920504645.7U patent/CN210265445U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973504A (en) * | 2019-04-15 | 2019-07-05 | 宝石机械成都装备制造分公司 | The anti-pull rod thread gluing combination nut of fracturing pump |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201015 Address after: 618300, No. two, Nanchang Road, Guanghan, Sichuan, Deyang 48 Patentee after: SICHUAN BAOSHI MACHINERY SPECIAL VEHICLE Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: 610052 Longtan Industrial Park, two ring road, East Three Ring Road, Chengdu, Chenghua District, Sichuan Patentee before: BAOSHI MACHINERY CHENGDU EQUIPMENT MANUFACTURING BRANCH |
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| TR01 | Transfer of patent right |