A seal gland for a hydraulic end of a fracturing pump

Abstract

The utility model discloses a kind of sealing gland of fracturing pump fluid end, including pump box module, the pump box module includes pump box, the top of the pump box is equipped with fracturing fluid outlet, the bottom of the pump box is equipped with fracturing fluid inlet, plunger hole is equipped in the front of pump box, and sealing mouth is equipped in its back;Cover assembly, the cover assembly includes detachably connected in plunger hole part and cover one, the inside of the cover one is movably connected with plunger shaft.This kind of sealing gland of fracturing pump fluid end, the sealing gland adopts the mode that cover one is connected with plunger hole screw thread, cooperate cover two and pass through clamping groove and the limiting block of cover one adaptation, and fixed by means of positioning member, when needing to disassemble maintenance, make positioning member and cover two disengaging connection, then through rotating cover one, it can be easily taken out from plunger hole, both can quickly disassemble and replace the sealing ring in it, and cover one can also reduce the situation of loosening when equipment moves.

Description

Technical Field

[0001] This utility model relates to the field of fracturing pump technology, specifically a sealing cap for the hydraulic end of a fracturing pump. Background Technology

[0002] In the field of oil and gas extraction, fracturing operations are crucial. They utilize high-pressure fracturing fluids to induce fractures in oil and gas reservoirs, improving the underground flow environment and significantly increasing well production. This is a primary method for enhancing oil and gas field productivity. Fracturing equipment typically consists of a prime mover and a plunger pump. The prime mover provides mechanical power to the plunger pump, which in turn uses this power to pressurize the fracturing medium, achieving high-pressure pumping of the fracturing medium.

[0003] In the existing technology, the sealing gland is fixed to the end of the pump cylinder by bolts. The sealing groove of the sealing gland is a closed structure. Since the sealing ring is installed inside the pump cylinder, the gland needs to be completely disassembled when replacing the seal. It is time-consuming and laborious to maintain it later, and it is inconvenient to use. Therefore, further optimization is made to address the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a sealing gland for the hydraulic end of a fracturing pump, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealing cap for the hydraulic end of a fracturing pump, comprising, A pump box module, comprising a pump box body, wherein the top of the pump box body is provided with a fracturing fluid outlet, the bottom of the pump box body is provided with a fracturing fluid inlet, a plunger hole is provided on the front of the pump box body, and a sealing port is provided on its back; A gland assembly includes a gland one detachably connected to a plunger hole. A plunger shaft is movably connected inside the gland one. The other end of the plunger shaft passes through the gland one and extends into the plunger hole. Limiting blocks are evenly arranged around the circumference of the gland one. A positioning groove is provided on the side of the pump housing along a first direction around the plunger hole. A gland two is detachably connected inside the positioning groove. A slot adapted to the limiting block is provided on the back of the gland two. The pump housing is provided with a positioning element on the side near the plunger hole, which is used in conjunction with the pressure cap.

[0006] Preferably, the inner wall of the plunger hole is threaded at the connection point with the gland, and the gland is threadedly connected inside the plunger hole.

[0007] Preferably, the positioning component includes a fixing block fixedly connected to the pump housing near the positioning groove. A slide rail is provided through one side of the fixing block, and a positioning rod is slidably connected inside the slide rail. A fixing groove is provided around the circumference of the pressure cover, and both ends of the positioning rod extend into the fixing groove.

[0008] Preferably, the positioning rod extends to the upper surface inside the fixing block and is fixedly connected to a guide shaft, the surface of the guide shaft is fitted with a spring, the upper surface of the fixing block is provided with an auxiliary hole, and the top end of the guide shaft extends into the interior of the auxiliary hole.

[0009] Preferably, a buffer pad is fixedly connected to the back of the second pressure cover, and a marking layer is provided on the front of the second pressure cover, which corresponds to the card slot.

[0010] Preferably, the pump housing is equipped with a valve core at the fracturing fluid outlet and fracturing fluid inlet, and the sealing port is equipped with a suction cap and a threaded cap.

[0011] This utility model has the following beneficial effects: This is a sealing gland for the hydraulic end of a fracturing pump. The sealing gland is connected to the plunger hole by a threaded connection of gland one and gland two by a groove that fits into the limiting block of gland one and is fixed by a positioning component. When disassembly and maintenance are required, the positioning component is disengaged from gland two, and gland one can be easily removed from the plunger hole by rotating it. This allows for quick disassembly and replacement of the internal sealing ring and reduces the possibility of gland one becoming loose during equipment movement. This sealing cap for the hydraulic end of a fracturing pump offers several advantages in terms of structural stability and safety. The spring in the positioning component provides continuous elasticity to the positioning rod, ensuring it is securely engaged in the fixing groove of the cap. This prevents the cap from easily loosening under the vibration and pressure variations of fracturing operations, thus enhancing the overall structural stability. Furthermore, the marking layer on the front of the cap corresponds to the locking groove, facilitating quick alignment of the limiting block during installation and ensuring installation accuracy. This prevents misalignment from affecting the sealing effect and structural stability. Simultaneously, the detachable connection design of each component allows for individual replacement when a single component is damaged, eliminating the need to replace the entire hydraulic end assembly and reducing equipment usage and maintenance costs. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the disassembly structure of the pressure cap of this utility model; Figure 3 This is a schematic diagram of the structure of the pressure cap of this utility model; Figure 4 This is a schematic cross-sectional view of the pump housing of this utility model; Figure 5 This is a schematic diagram of the valve core installation structure inside the pump housing of this utility model; Figure 6 This is a cross-sectional view of the fixing block of this utility model.

[0013] The components are as follows: 1. Pump housing; 2. Fracturing fluid outlet; 3. Fracturing fluid inlet; 4. Plunger hole; 5. Sealing port; 6. Plunger shaft; 7. Gland 1; 8. Limiting block; 9. Positioning groove; 10. Gland 2; 11. Slot; 12. Positioning component; 1201. Fixing block; 1202. Slide rail; 1203. Positioning rod; 1204. Fixing groove; 1205. Guide shaft; 1206. Spring; 1207. Auxiliary hole; 13. Buffer pad; 14. Marking layer; 15. Valve core. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1 to 6 This utility model provides a sealing cap for the hydraulic end of a fracturing pump; it includes a pump box module, which includes a pump box body 1. The top of the pump box body 1 is provided with a fracturing fluid outlet 2, the bottom of the pump box body 1 is provided with a fracturing fluid inlet 3, a plunger hole 4 is provided on the front of the pump box body 1, and a sealing port 5 is provided on its back; inside the pump box body 1, a valve core 15 is provided at the fracturing fluid outlet 2 and the fracturing fluid inlet 3, and a suction cap and a threaded cap are provided at the sealing port 5.

[0016] The pressure cap assembly includes a pressure cap 7 detachably connected to the plunger hole 4. A plunger shaft 6 is movably connected inside the pressure cap 7. The other end of the plunger shaft 6 passes through the pressure cap 7 and extends into the interior of the plunger hole 4. Limiting blocks 8 are evenly arranged around the circumference of the pressure cap 7. The pump housing 1 has a positioning groove 9 on the side along the first direction and around the circumference of the plunger hole 4. A pressure cap 10 is detachably connected inside the positioning groove 9. A slot 11 adapted to the limiting block 8 is opened on the back of the pressure cap 10. The part where the inner wall of the plunger hole 4 connects to the pressure cap 7 is threaded, and the pressure cap 7 is threadedly connected inside the plunger hole 4.

[0017] like Figure 1-2As shown, a sealing ring is provided inside the pump housing 1. The sealing ring is the "key barrier" between the plunger shaft 6 and the pump housing 1. Its core function is to achieve reliable sealing (leakage prevention), resist wear and corrosion (life protection), and assist the plunger in stable movement (efficiency improvement) under harsh working conditions such as high pressure, alternating load, and particulate media. It directly affects the operating stability and maintenance cost of the fracturing pump and is the core component of the hydraulic end sealing system of the fracturing pump.

[0018] The pump housing 1 is provided with a positioning element 12 on the side near the plunger hole 4, which is used in conjunction with the pressure cover 10. The positioning element 12 includes a fixing block 1201 fixedly connected to the pump housing 1 near the positioning groove 9. A slide 1202 is provided through one side of the fixing block 1201. A positioning rod 1203 is slidably connected inside the slide 1202. A fixing groove 1204 is opened on the circumference of the pressure cover 10. Both ends of the positioning rod 1203 extend into the interior of the fixing groove 1204. The positioning rod 1203 extends to the upper surface inside the fixing block 1201 and is fixedly connected to the guide shaft 1205. The surface of the guide shaft 1205 is fitted with a spring 1206. The upper surface of the fixing block 1201 is provided with an auxiliary hole 1207. The top end of the guide shaft 1205 extends into the interior of the auxiliary hole 1207.

[0019] To prevent the first cover 7 from becoming loose, the second cover 10 can be fixed by inserting both ends of the positioning rod 1203 into the fixing groove 1204. The spring 1206 ensures that the positioning rod 1203 is always connected inside the fixing groove 1204. When disassembling, the positioning rod 1203 can be moved upward by hand. At this time, the spring 1206 is compressed, and both ends of the positioning rod 1203 move out of the fixing groove 1204, thereby disassembling the second cover 10. Then, the first cover 7 can be rotated to disassemble.

[0020] A buffer pad 13 is fixedly connected to the back of the pressure cover 10, and a marking layer 14 is provided on the front of the pressure cover 10, which corresponds to the card slot 11. Regarding sealing performance, traditional glands are prone to leakage and wear of the sealing rings under high pressure conditions, while this sealing gland effectively avoids these problems. The threaded connection between gland one 7 and plunger hole 4 provides a stable initial foundation for sealing and reduces gap formation. Gland two 10, through the cooperation of the slot 11 and the limiting block 8 and the fixing of the positioning part 12, further enhances the tightness of the connection between the gland assembly and the pump housing 1, making the overall structure more stable under high pressure and reducing the risk of leakage. Moreover, the buffer pad 13 on the back of gland two 10 can effectively alleviate the impact of alternating loads caused by the reciprocating motion of the plunger shaft 6, extend the service life of the sealing structure, ensure the reliability of sealing under high pressure conditions, reduce operation interruptions caused by leakage, and reduce maintenance costs.

[0021] In this invention, the working steps of the device are as follows: In use, one end of the plunger shaft 6 is passed through the inside of the pressure cap 7, so that the plunger shaft 6 and the pressure cap 7 are movably connected. Then, holding the pressure cap 7, it is aligned with the plunger hole 4 of the pump housing 1. By rotating the pressure cap 7, the threaded engagement between the pressure cap 7 and the inner wall of the plunger hole 4 is used to screw the pressure cap 7 into the plunger hole 4 until the end face of the pressure cap 7 fits tightly against the corresponding surface of the pump housing 1. Observe the marking layer 14 on the front of the second pressure cover 10. According to the correspondence between the marking layer 14 and the slot 11, align the slot 11 of the second pressure cover 10 with the limiting block 8 on the circumference of the first pressure cover 7. Then, place the second pressure cover 10 into the positioning slot 9 of the pump box 1. During the process, ensure that the slot 11 and the limiting block 8 are fully fitted and engaged. Before installing the second pressure cover 10, first pull the top end of the guide shaft 1205 in the positioning component 12 upward to extend the top end of the guide shaft into the auxiliary hole 1207 of the fixing block 1201. At this time, the guide shaft 1205 drives the positioning rod 1203 to slide upward along the slide 1202 of the fixing block 1201, and the spring 1206 is compressed. After the second pressure cover 10 is placed into the positioning groove 9, release the guide shaft 1205, and the spring 1206 restores its elastic deformation, pushing the positioning rod 1203 to slide downward, so that both ends of the positioning rod 1203 extend into the fixing groove 1204 on the circumference of the second pressure cover 10, thus completing the fixing of the second pressure cover 10.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing gland for the hydraulic end of a fracturing pump, characterized in that: include, The pump box module includes a pump box body (1), the top of the pump box body (1) is provided with a fracturing fluid outlet (2), the bottom of the pump box body (1) is provided with a fracturing fluid inlet (3), a plunger hole (4) is provided on the front of the pump box body (1), and a sealing port (5) is provided on its back. A gland assembly includes a gland one (7) detachably connected to the plunger hole (4). A plunger shaft (6) is movably connected inside the gland one (7). The other end of the plunger shaft (6) passes through the gland one (7) and extends into the plunger hole (4). Limiting blocks (8) are evenly arranged around the circumference of the gland one (7). The pump housing (1) has a positioning groove (9) on the side of the plunger hole (4) along the first direction. A gland two (10) is detachably connected inside the positioning groove (9). A slot (11) adapted to the limiting block (8) is opened on the back of the gland two (10). The pump housing (1) is provided with a positioning element (12) on the side near the plunger hole (4) that works in conjunction with the pressure cover (10).

2. The sealing gland for the hydraulic end of a fracturing pump according to claim 1, characterized in that: The inner wall of the plunger hole (4) is threaded at the connection point with the pressure cap (7), and the pressure cap (7) is threadedly connected inside the plunger hole (4).

3. The sealing gland for the hydraulic end of a fracturing pump according to claim 1, characterized in that: The positioning component (12) includes a fixing block (1201) fixedly connected to the pump housing (1) near the positioning groove (9). A slide rail (1202) is provided through one side of the fixing block (1201). A positioning rod (1203) is slidably connected inside the slide rail (1202). A fixing groove (1204) is provided on the circumference of the pressure cover (10). Both ends of the positioning rod (1203) extend into the interior of the fixing groove (1204).

4. The sealing gland for the hydraulic end of a fracturing pump according to claim 3, characterized in that: The positioning rod (1203) extends to the upper surface inside the fixing block (1201) and is fixedly connected to a guide shaft (1205). A spring (1206) is sleeved on the surface of the guide shaft (1205). An auxiliary hole (1207) is opened on the upper surface of the fixing block (1201). The top end of the guide shaft (1205) extends into the interior of the auxiliary hole (1207).

5. A sealing gland for the hydraulic end of a fracturing pump according to claim 1, characterized in that: The back of the second pressure cover (10) is fixedly connected to a buffer pad (13), and the front of the second pressure cover (10) is provided with a marking layer (14) and corresponds to the card slot (11).

6. The sealing gland of the hydraulic end of a fracturing pump according to claim 1, characterized in that: Inside the pump housing (1), a valve core (15) is provided at the fracturing fluid outlet (2) and fracturing fluid inlet (3), and a suction cap and a threaded cap are provided at the sealing port (5).

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