Dismounting and replacing device for valve seat of fracturing pump

Abstract

The invention discloses a fracturing pump valve seat dismounting and replacing device, and relates to the field of maintenance and repair of pumps, and the fracturing pump valve seat dismounting and replacing device comprises a lifting rod, a pull rod, a gear box, a driving gear, a driving motor, an outer fastener, an oil pump, a fracturing pump fluid end, a valve body, a clamping jaw, a connecting rod, a clamping jaw seat, a fastener and a bearing end cover. The tail end of the lifting rod is connected with a connecting hole in the clamping jaw through a connecting rod. The pull rod is mounted on the outer side of the lifting rod; the driving motor drives the driving gear to be meshed with the transmission gear structure at the upper end of the outer fastener and is installed in the gearbox. The outer fastening piece is matched with the fastening piece through the transmission threads; the oil cylinder is placed above the fluid end cavity opening; and the bearing end cover is mounted above the outer fastener. The invention provides the fracturing pump valve seat dismounting and replacing device which is convenient to use and higher in working efficiency, and the maintenance and replacement efficiency of a fracturing field valve seat can be further improved.

Description

Technical Field

[0001] The invention relates to the field of pump maintenance and repair, and in particular to a valve seat disassembly and replacement device for a fracturing pump. Background Art

[0002] With the large-scale exploitation of shale gas, shale gas well platform operations are characterized by multiple construction layers, large displacement, and large fluid volumes per layer. Multiple fracturing trucks are required to operate simultaneously on a single platform. The valve bodies and valve seats in the hydraulic end of the fracturing pumps are subject to wear and tear from the hard impurities in the mud. This prevents the valve seats and valve bodies in each volume chamber of the fracturing pump from closing or opening in a timely manner, resulting in malfunctions and the need for frequent replacement and maintenance, which is time-consuming and labor-intensive.

[0003] The valve seat replacement device currently used in fracturing sites still requires manual disassembly and assembly of the claws, and is difficult to remove from the device after the pump head is removed. Therefore, we propose a fracturing pump valve seat replacement device to solve the above problems. Summary of the Invention

[0004] The present invention provides a fracturing pump valve seat replacement device with simpler manual operation and higher working efficiency, which is used to solve the problems of cumbersome replacement and maintenance of the valve seat and time-consuming and labor-intensive replacement process proposed in the above background technology.

[0005] The technical solution adopted by the present invention is to provide a fracturing pump valve seat disassembly and replacement device, comprising:

[0006] The lifting rod has a semicircular connecting hole at the end, which is connected to the claw through a connecting rod.

[0007] The inner side of the claw is provided with two semicircular connecting holes, the upper end of which is connected to the claw seat, and the lower end is connected to the connecting rod.

[0008] The connecting rod is provided with semicircular connecting holes at both ends, which are respectively connected to the connecting hole at the lower end of the clamping claw and the connecting hole at the end of the lifting rod.

[0009] The claw seat is provided with four semicircular connecting holes in the circumference, which are correspondingly connected to the connecting holes at the upper ends of the claws.

[0010] The driving gear is driven by the driving motor and is installed inside the gear box.

[0011] The upper end of the external fastener is embedded in the gear box, and the transmission gear structure on it is engaged with the driving gear.

[0012] The fastener is engaged with the external fastener through threads and is close to the upper end face of the cylinder.

[0013] Pull rod, installed on the outside of the lifting rod.

[0014] The gear box is installed at the upper position of the pull rod through the bearing tightening thread structure.

[0015] The oil cylinder is placed above the hydraulic end cavity and installed in the center of the cavity.

[0016] The bearing end cover is installed on the upper end surface of the external fastener.

[0017] Furthermore, the upper end of the external fastener is provided with a transmission gear structure that meshes with the driving gear, and the interior is provided with a thread that cooperates with the fastener.

[0018] Furthermore, a bearing is installed at the center of the external fastener transmission gear structure.

[0019] Furthermore, the transmission gear structure at the upper end of the external fastener and the sleeve at the lower end are integrated and move synchronously.

[0020] Furthermore, the oil cylinder is connected to an oil pipe and is used in conjunction with a hydraulic pump.

[0021] Furthermore, a return hook is provided at the lower end of the clamping claw, and a limiting structure is provided at the upper end.

[0022] Furthermore, the fastener is provided with a thread that matches the internal thread of the upper external fastener.

[0023] Compared with conventional fracturing pump valve seat replacement devices, the present invention drives the driving gear to drive the transmission gear by providing a driving motor, thereby driving the external fastener to rotate, thereby achieving automatic tightening through the spiral transmission between the external fastener and the fastener, avoiding the need for manual tightening during on-site work, which is time-consuming and labor-intensive. The valve seat is then replaced through the action of a hydraulic device. At the same time, the structure of the claw lifting rod further optimizes the valve seat replacement method, making it more convenient to remove the valve seat. The present invention further simplifies the tedious process of manual operation, improves the automation of the tightening process, and simplifies the replacement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 This is a front cross-sectional structural diagram of the present invention;

[0026] Figure 2 Schematic diagram of the overall structure of the device of the present invention;

[0027] Figure 3is a schematic diagram of the fastening structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the claw structure of the present invention.

[0029] In the figure: 1-lifting rod; 2-pull rod; 3-gearbox; 4-driving gear; 5-driving gear; 6-external fastener; 7-oil pump; 8-hydraulic end of fracturing pump; 9-valve seat; 10-claw; 101-connecting rod; 102-claw seat; 11-fastener; 12-bearing end cover; 13-bearing tightening thread. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] Example:

[0032] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 , a valve seat replacement device, a semicircular connecting hole is provided at the end of the lifting rod 1, which is connected to the claw 10 through the connecting rod 101 to realize the control of the opening and closing of the claw; the pull rod 2 is installed on the outside of the lifting rod 1; the driving motor 5 drives the active gear 4 to rotate and engage with the transmission gear structure at the upper end of the fastener 11 to transmit power, and is installed inside the gear box 3; the external fastener 6 cooperates with the fastener 11 through a thread, and is tightened by spiral transmission; the oil cylinder 7 is placed above the cavity of the hydraulic end 8 of the fracturing pump; the claw 10 is clamped to the bottom of the valve seat 9 through the side return hook to realize the clamping of the valve seat; the bearing end cover is installed above the external fastener 6.

[0033] In this embodiment, a spherical gripping point is provided at the upper end of the lifting rod 1 to facilitate use in on-site work, and a semicircular connecting hole is provided at the end thereof to connect the corresponding connecting rod 101 with the claw. The lifting rod 1 is moved longitudinally along the inner wall of the pull rod 2 to control the opening and closing of the claw; there is a circular hole-shaped channel on the oil pump 7, the diameter of which is larger than the diameter of the claw 10 when it is retracted, to ensure that the claw can pass smoothly when it is lowered.

[0034] Furthermore, in some implementations of this embodiment, Figure 1 、 Figure 4As shown, when the staff is operating, they first place the oil pump 7 at the upper cavity of the hydraulic end 8 of the fracturing pump. Then, the claws 7 remain in the retracted state, smoothly pass through the circular channel on the oil pump, enter from the upper cavity of the hydraulic end 8 of the fracturing pump, and move axially downward.

[0035] In this embodiment, the lower end of the clamping claw 10 is shaped like a truncated cone. After being squeezed from the side, it can be retracted inward under the action of the connecting rod 101 to ensure that it can smoothly pass through the central through hole of the valve seat 9 when lowered; the upper end of the clamping claw 10 is provided with a circular limiting structure, the diameter of which is slightly larger than the size of the through hole of the valve seat.

[0036] Furthermore, in some implementations of this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the device is lowered, the claw 10 contacts the valve seat 9, and the side is pressed. The claw 10 closes toward the middle under the action of the connecting rod, passes through the through hole of the valve seat, and continues to be lowered a certain distance. The upper end limit structure of the claw 10 is clamped on the upper end face of the valve seat to ensure that the lowering distance is reasonable and the positioning is completed.

[0037] In this embodiment, a drive motor 5 is installed in the gear box 3 to drive the upper driving gear 4, which engages with the transmission gear structure at the upper end of the external fastener 6 to transmit power; the external fastener 6 is provided with an internal thread that engages with the external thread at the upper end of the fastener 11.

[0038] Furthermore, in some implementations of this embodiment, Figure 1 、 Figure 3 As shown, the drive motor 5 drives the transmission gear 4 to rotate, meshing with the transmission gear structure at the upper end of the external fastener 6, driving the external fastener 6 to rotate as a whole, and through spiral transmission, the fastener 11 moves in a direction away from the external fastener 6, and finally clamps on the upper end surface of the cylinder 7 to achieve the tightening effect.

[0039] In this embodiment, the oil cylinder 7 is provided with an oil chamber, the rear end of which is connected to an oil pipe connected to a matching hydraulic pump, and the oil enters the oil chamber to achieve the lifting effect.

[0040] Furthermore, in some implementations of this embodiment, Figure 1 As shown, after the tightening operation of the fastener 11 is completed, the hydraulic pump connected to the oil chamber 7 starts to work, so that the oil enters the oil chamber of the oil cylinder 7, and the replacement device as a whole moves in the direction away from the oil pump, thereby achieving the purpose of replacing the valve seat.

[0041] Furthermore, in some implementations of this embodiment, Figure 1As shown, after the valve seat 9 is taken out of the hydraulic end cavity of the fracturing pump, the lifting rod 1 connected to the claw 10 is pulled up, the claw 10 is closed toward the center, and the valve seat 9 is separated from the disassembly and replacement device, completing the disassembly and replacement process.

[0042] It should be noted that the hydraulic pump matched with the oil cylinder 7 can be a hand-cranked or manual hydraulic pump, a pneumatic hydraulic pump, an electric hydraulic pump, etc., and it is only necessary to ensure that the oil cylinder 7 can achieve changes in height.

[0043] It can be seen that the fracturing pump valve seat replacement device of the present invention is scientifically and reasonably designed, which can further reduce the manpower and time consumed in replacing the valve seat at the fracturing site, further improve the work efficiency at the fracturing site, and has certain promotion value and practicality.

[0044] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0045] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A fracturing pump valve seat disassembly and replacement device, comprising: The lifting rod (1) is provided with a semicircular connecting hole at the end thereof and is connected to the clamping claw (10) via a connecting rod (101). The clamping claw (10) has two semicircular connection holes arranged on its inner side, the upper end of which is connected to the clamping claw seat (102) and the lower end of which is connected to the connecting rod (101). The connecting rod (101) is provided with semicircular connecting holes at both ends, which are respectively connected to the connecting hole at the lower end of the clamping claw and the connecting hole at the end of the lifting rod (1). The claw seat (102) is provided with four semicircular connection holes in the circumferential direction, which are correspondingly connected to the connection holes at the upper ends of the claws. The driving gear (4) is driven by a driving motor (5) and is installed inside the gear box (3). The outer fastener (6) has an upper end embedded in the gear box, and the transmission gear structure on it is meshed with the driving gear (4). The fastener (11) is engaged with the external fastener (6) through a thread and is close to the upper end surface of the oil cylinder (7). The pull rod (2) is installed on the outside of the lifting rod (1). The gear box (3) is installed at the upper position of the pull rod (2) through a bearing tightening thread (13) structure. The oil cylinder (7) is placed above the hydraulic end cavity and installed in the center of the cavity. The bearing end cover (12) is mounted on the upper end surface of the outer fastener (6).

2. A fracturing pump valve seat replacement device as claimed in claim 1, characterized in that: The upper end of the external fastener (6) is provided with a transmission gear structure meshing with the driving gear (4), and a thread is provided inside to match the fastener (11).

3. A fracturing pump valve seat replacement device as claimed in claim 1, characterized in that: A bearing is installed at the center of the transmission gear structure of the external fastener (6).

4. A fracturing pump valve seat replacement device as claimed in claim 1, characterized in that The transmission gear structure at the upper end of the external fastener (6) and the sleeve at the lower end are integrated and move synchronously.

5. A fracturing pump valve seat replacement device as claimed in claim 1, characterized in that The oil cylinder (7) is connected with an oil pipe at the rear and is used in conjunction with a hydraulic pump.

6. A fracturing pump valve seat replacement device as claimed in claim 1, characterized in that The lower end of the clamping claw (10) is provided with a return hook, and the upper end is provided with a limiting structure.

7. A fracturing pump valve seat replacement device as claimed in claim 1, characterized in that The fastener (11) is provided with a thread which matches the internal thread of the upper external fastener (6).

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