Fracturing pump fluid end overpressure protection device

Abstract

The utility model relates to fracturing pump fluid end protection technical field discloses a kind of fracturing pump fluid end overpressure protection device, including fluid frame and telescopic link, and the top of fluid frame is fixedly connected with pressure relief mechanism, and pressure relief mechanism includes sealing cover, hollow column and piston, and piston inner wall is slidably connected with movable block and spring two, and spring two and the spring one for piston reset are nested setting, and the outer wall of fluid frame is fixedly connected with limit block and rotating shaft, and rotating shaft is connected with the protective shell for covering the discharge port of fluid frame, and the top of fluid frame is equipped with the buckle for locking protective shell.The utility model removes piston inner wall to form pressure relief passage by movable block cooperation spring two when overpressure, and the discharge port is physically shielded using protective shell, solve the problem that prior art lacks automatic pressure relief and idle protection, reach the beneficial effect of automatic grading pressure relief protection equipment and prevent the discharge port from being contaminated and corroded.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic end protection technology for fracturing pumps, and in particular to an overpressure protection device for the hydraulic end of a fracturing pump. Background Technology

[0002] As a key piece of equipment in oil and gas extraction, the hydraulic end of the fracturing pump withstands enormous pressure during operation and is responsible for injecting high-pressure fluid into the formation for fracturing operations. The core components of the hydraulic end, such as pistons, plungers, and valve groups, are in direct contact with the high-pressure fluid, and their structural design and operational reliability are crucial to the entire fracturing operation.

[0003] However, in actual operation, due to various factors such as formation pressure fluctuations, changes in pumped medium characteristics, equipment failures, or operational errors, the pressure inside the hydraulic end can suddenly rise and exceed the equipment's safe pressure limit. Without an effective pressure control or relief mechanism, this overpressure state can cause structural damage to critical components of the hydraulic end, or even lead to equipment failure. This will result in severe production interruptions and costly repairs. While existing technologies include some pressure monitoring and manual pressure relief measures, manual operation suffers from delayed response and cannot provide immediate protection during sudden pressure changes. Furthermore, the reliability and sealing life of traditional simple safety valve structures will decline under long-term high-pressure reciprocating conditions. The system is affected by the fact that a single pressure relief threshold cannot precisely address pressure fluctuations under complex operating conditions. Furthermore, when the fracturing pump stops working and is idle, the hydraulic outlet is exposed, allowing dust, moisture, or other corrosive substances in the environment to directly contact the inner wall and seals of the outlet. Over time, these contaminants will adhere to, accumulate, or cause material corrosion, affecting not only the sealing performance and fluid transport efficiency of the outlet but also increasing the workload of cleaning and inspection before restarting, reducing the efficiency and ease of maintenance of the equipment. Existing protective measures are simple covers or plugs, which are cumbersome to install and disassemble and do not provide ideal protection, failing to offer robust and easy-to-operate protection.

[0004] Therefore, this utility model proposes an overpressure protection device for the hydraulic end of a fracturing pump to address the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems in the existing technology of hydraulic end overpressure protection devices for fracturing pumps, such as the lack of an effective automatic pressure relief mechanism leading to equipment damage when the pressure is too high, and the lack of protection at the discharge port when idle, which leads to pollution and corrosion, this utility model aims to provide a fracturing pump hydraulic end overpressure protection device with an improved structure that can effectively solve the above problems.

[0006] This utility model provides an overpressure protection device for the hydraulic end of a fracturing pump, comprising: a hydraulic frame, and a telescopic rod slidably fitted to the inner wall of one side of the hydraulic frame. A movable plug is slidably connected to the bottom of the inner wall of the hydraulic frame, and a pressure relief mechanism is fixedly connected to the top of the hydraulic frame. The pressure relief mechanism includes a sealing cover, a hollow column slidably connected to the inner wall of the sealing cover, a piston fixedly connected to the bottom of the hollow column, the outer wall of the piston slidably connected to the inner wall of the hydraulic frame, a spring one fixedly connected to the bottom of the sealing cover, the bottom of the spring one fixedly connected to the top of the piston, and the spring one located in the internal space of the hollow column, as well as a movable block and a spring two disposed inside the piston.

[0007] The piston has a through hole in its inner wall, the movable block is slidably sealed in the through hole, and a second spring is fixedly connected to the top of the movable block. The top of the second spring is fixedly connected to the bottom of the sealing cover.

[0008] Furthermore, the second spring and the first spring form a coaxial nesting relationship located in the internal space of the hollow column. When the pressure on the inner wall of the hydraulic frame exceeds the preset value, the movable block and the piston move in a relative sliding manner. That is, the movable block overcomes the elastic force of the second spring and slides upward along the inner wall of the piston and moves out of the inner wall of the piston to form a pressure relief channel. After the pressure decreases, the second spring presses the movable block downward back to the inner wall of the piston to restore the sealing state.

[0009] Preferably, a protective mechanism is fixedly connected to the outer wall of the hydraulic frame. The protective mechanism includes a limiting block, which is fixedly connected to the front side of the outer wall of the hydraulic frame. A rotating shaft is rotatably connected to the inner wall of the limiting block, and a protective shell is fixedly connected to the outer wall of the rotating shaft. The protective shell rotates around the limiting block through the rotating shaft to cover or expose the outlet on the hydraulic frame.

[0010] Preferably, the top of the outer wall of the hydraulic frame is rotatably connected to a buckle. When the buckle is rotated to the position where it engages with the protective shell, the protective shell covering the outlet is fixed.

[0011] Preferably, the elastic coefficient of the second spring is greater than that of the first spring, so that when the pressure on the inner wall of the hydraulic frame increases, the piston moves inside the hollow column before the movable block.

[0012] Preferably, an annular sealing ring is provided between the outer wall of the hollow column and the inner wall of the sealing cover, and the hollow column slides along the central axis of the sealing cover.

[0013] Preferably, there are multiple telescopic rods, which are evenly distributed along the side wall of the hydraulic frame, and the number of movable plugs corresponds to the number of telescopic rods.

[0014] Preferably, the bottom of the movable block is flush with the bottom of the piston when the piston is in the reset position, and the spring presses the piston down to the inner wall of the hydraulic frame to achieve reset.

[0015] Preferably, the sealing cap is fixedly installed on the top of the hydraulic frame by bolts.

[0016] This utility model has the following beneficial effects:

[0017] 1. This utility model solves the problem that existing fracturing pumps lack an effective automatic pressure relief mechanism during operation, which can lead to equipment damage when the pressure is too high. It achieves the effect of automatically distinguishing between normal working state and overpressure state according to the pressure size, and automatically opening the internal channel for pressure relief protection when the pressure exceeds the limit, thereby improving the safety and reliability of equipment operation.

[0018] 2. This utility model solves the problem in the prior art that the hydraulic end outlet of a fracturing pump is exposed for a long time when idle or not in operation, which will cause pollution and corrosion due to dust accumulation or environmental factors, thus increasing the difficulty of subsequent cleaning and maintenance. It achieves the effect of convenient physical shielding and fixed protection of the outlet, effectively preventing dust from entering and component corrosion, extending the service life of the equipment and reducing maintenance costs. Attached Figure Description

[0019] Figure 1 This is a front perspective view of an overpressure protection device for the hydraulic end of a fracturing pump proposed in this utility model;

[0020] Figure 2 This is a cross-sectional view of the hydraulic frame of a fracturing pump hydraulic end overpressure protection device proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the pressure relief mechanism of an overpressure protection device for the hydraulic end of a fracturing pump proposed in this utility model;

[0022] Figure 4 This is an exploded view of the pressure relief mechanism of an overpressure protection device for the hydraulic end of a fracturing pump proposed in this utility model;

[0023] Figure 5 This is an exploded view of the protection mechanism of the hydraulic end overpressure protection device for a fracturing pump proposed in this utility model;

[0024] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0025] Legend:

[0026] 1. Hydraulic frame; 2. Pressure relief mechanism; 201. Sealing cover; 202. Hollow column; 203. Piston; 204. Spring 1; 205. Spring 2; 206. Movable block; 3. Protection mechanism; 301. Limiting block; 302. Rotating shaft; 303. Protective shell; 304. Buckle; 4. Telescopic rod; 5. Movable plug. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] Example:

[0029] Please refer to Figures 1 to 6 This utility model provides an overpressure protection device for the hydraulic end of a fracturing pump, which aims to solve the structural defects of existing fracturing pumps, such as the lack of an effective automatic pressure relief mechanism during operation leading to equipment damage and the lack of protection at the discharge port during idle periods, which can result in contamination.

[0030] Please refer to Figure 1 and Figure 2 The hydraulic end overpressure protection device of the fracturing pump includes a hydraulic frame 1 and a telescopic rod 4 that slides on the inner wall of one side of the hydraulic frame 1. The hydraulic frame 1 serves as the mounting base and fluid receiving cavity of the entire device. There are multiple telescopic rods 4, which are evenly distributed along the side wall of the hydraulic frame 1. The multiple telescopic rods 4 are driven by an external drive device to reciprocate on the inner wall of the hydraulic frame 1 to generate pressure changes. A movable plug 5 is slidably connected to the bottom of the inner wall of the hydraulic frame 1. The number of movable plugs 5 corresponds to the number of telescopic rods 4. When the telescopic rods 4 move outward and generate negative pressure, the movable plug 5 slides upward to draw liquid into the hydraulic frame 1. A pressure relief mechanism 2 is fixedly installed at the top opening of the hydraulic frame 1 by bolts. A protection mechanism 3 is fixedly connected to the front side of the outer wall of the hydraulic frame 1. The pressure regulation of the hydraulic frame 1 during operation and the physical protection during idle time are achieved through the cooperation of the pressure relief mechanism 2 and the protection mechanism 3.

[0031] Please refer to Figure 2 , Figure 3 and Figure 4The pressure relief mechanism 2 includes a sealing cover 201, which is fixedly installed on the top of the hydraulic frame 1 by bolts. A hollow column 202 is slidably connected to the inner wall of the sealing cover 201. The hollow column 202 slides along the central axis of the sealing cover 201. An annular sealing ring is provided between the outer wall of the hollow column 202 and the inner wall of the sealing cover 201 to ensure sealing during movement. A piston 203 is fixedly connected to the bottom of the hollow column 202. The outer wall of the piston 203 is slidably and sealingly connected to the inner wall of the hydraulic frame 1. The bottom of piston 203 faces the internal fluid cavity of hydraulic frame 1 and acts as the pressure-bearing body to transmit the fluid pressure inside hydraulic frame 1 to pressure relief mechanism 2. The bottom of sealing cover 201 is fixedly connected to spring 204. The bottom of spring 204 is fixedly connected to the top of piston 203. Spring 204 is located in the internal space of hollow column 202. When telescopic rod 4 moves outward, the elastic force of spring 204 presses piston 203 down back to the inner wall of hydraulic frame 1 to achieve reset, ensuring normal suction and discharge reciprocating pumping cycle.

[0032] The inner wall of piston 203 has a through hole, and a movable block 206 is slidably connected to the inner wall of piston 203. The movable block 206 is slidably sealed in the through hole. When piston 203 is in the reset position, the bottom of movable block 206 is flush with the bottom of piston 203. A second spring 205 is fixedly connected to the top of movable block 206. The top of spring 205 is fixedly connected to the bottom of sealing cover 201. Spring 205 is located in the internal space of hollow column 202, and spring 205 and spring 1 204 form a coaxial nesting relationship. The elastic coefficient of spring 205 is greater than that of spring 1 204. This nested double spring / double movable part cooperation structure ensures that spring 1 204 is responsible for the normal reset of piston 203 during the normal pumping stage, while in the overpressure state, spring 205 with a higher threshold controls the pressure relief of movable block 206.

[0033] As a preferred embodiment, to provide physical shielding for the outlet on the hydraulic frame 1 to prevent dust accumulation or corrosion, please refer to... Figure 1 , Figure 5 and Figure 6 A limiting block 301 is fixedly connected to the front side of the outer wall of the hydraulic frame 1. A rotating shaft 302 is rotatably connected to the inner wall of the limiting block 301. A protective shell 303 is fixedly connected to the outer wall of the rotating shaft 302. The protective shell 303 rotates relative to the hydraulic frame 1 through the rotating shaft 302. The inner wall space of the protective shell 303 is larger than the size of the outlet of the hydraulic frame 1, so that when the protective shell 303 is rotated to the closed position, the outlet can be completely covered inside the protective shell 303.

[0034] As a further preferred embodiment, in order to ensure the stability of the protective shell 303 in the closed protective state and prevent accidental opening, a buckle 304 is rotatably connected to the top of the outer wall of the hydraulic frame 1. The buckle 304 is located above the closed position of the protective shell 303. The buckle 304 is connected to the hydraulic frame 1 through a pin. When the protective shell 303 rotates to fit against the front outer wall of the hydraulic frame 1, the buckle 304 rotates and engages with the upper edge or outer surface of the protective shell 303. A pressing fit is formed between the buckle 304 and the protective shell 303 to lock the position of the protective shell 303.

[0035] Working principle: When using the fracturing pump, the telescopic rod 4 is driven by an external drive device to reciprocate against the inner wall of the hydraulic frame 1. When the telescopic rod 4 moves outward, the negative pressure generated pulls the movable plug 5 upward, drawing liquid into the interior of the hydraulic frame 1. When the telescopic rod 4 moves inward, it squeezes the internal liquid, hydraulically pushing the piston 203 upward and causing the hollow column 202 to slide inside the sealing cover 201. After the piston 203 rises a certain distance, it squeezes the liquid into the discharge port, thus pressurizing and discharging the liquid. After the discharge is completed, the spring 204 releases its elastic force, pressing the piston 203 downward. When the pressure on the inner wall of the hydraulic frame 1 is too high and exceeds the limit, the high-pressure fluid compresses the piston 203 upward to the limit position. Then, the excess pressure compresses the movable block 206 to overcome the resistance of the second spring 205 and move upward on the inner wall of the piston 203. The movable block 206 moves out of the inner wall of the piston 203 and opens the pressure relief channel. The excess pressure is discharged from the inner wall of the hydraulic frame 1. After the pressure is reduced, the second spring 205 presses the movable block 206 downward back into the piston 203 to restore the seal. Then, the first spring 204 presses the piston 203 downward back into the inner wall of the hydraulic frame 1 to resume normal operation.

[0036] When the work is completed or the equipment is idle, the operator holds the protective shell 303 and drives the rotating shaft 302 to rotate on the inner wall of the limit block 301, so that the protective shell 303 moves to the position covering the outlet of the hydraulic frame 1. The buckle 304 on the top of the hydraulic frame 1 is rotated to engage and fix it with the protective shell 303. The protective shell 303 completely hides the outlet on the inner wall to prevent the outlet from being corroded or covered by dust when not in use.

Claims

1. A fracturing pump hydraulic end overpressure protection device, comprising: A hydraulic frame (1) and a telescopic rod (4) that slides on the inner wall of one side of the hydraulic frame (1). A movable plug (5) is slidably connected to the bottom of the inner wall of the hydraulic frame (1). A pressure relief mechanism (2) is fixedly connected to the top of the hydraulic frame (1). The pressure relief mechanism (2) includes a sealing cover (201). A hollow column (202) is slidably connected to the inner wall of the sealing cover (201). A piston (203) is fixedly connected to the bottom of the hollow column (202). The outer wall of the piston (203) is slidably connected to the inner wall of the hydraulic frame (1). A spring (204) is fixedly connected to the bottom of the sealing cover (201). The bottom of the spring (204) is fixedly connected to the top of the piston (203), and the spring (204) is located in the internal space of the hollow column (202). Its features are, A movable block (206) is slidably connected to the inner wall of the piston (203). A second spring (205) is fixedly connected to the top of the movable block (206). The top of the second spring (205) is fixedly connected to the bottom of the sealing cover (201). The second spring (205) and the first spring (204) form a coaxial nesting relationship and are located in the internal space of the hollow column (202). The inner wall of the piston (203) is provided with a through hole. The movable block (206) is slidably sealed in the through hole. When the pressure on the inner wall of the hydraulic frame (1) exceeds the preset value, the movable block (206) overcomes the elastic force of the second spring (205) and slides upward along the inner wall of the piston (203) and moves out of the inner wall of the piston (203). The movement of the movable block (206) forms a pressure relief channel. After the pressure is reduced, the second spring (205) presses the movable block (206) downward back to the inner wall of the piston (203) to restore the sealing state.

2. The overpressure protection device for the hydraulic end of a fracturing pump according to claim 1, characterized in that, A protective mechanism (3) is fixedly connected to the outer wall of the hydraulic frame (1). The protective mechanism (3) includes a limiting block (301). The limiting block (301) is fixedly connected to the front side of the outer wall of the hydraulic frame (1). A rotating shaft (302) is rotatably connected to the inner wall of the limiting block (301). A protective shell (303) is fixedly connected to the outer wall of the rotating shaft (302). The protective shell (303) rotates around the limiting block (301) through the rotating shaft (302) to cover or expose the outlet on the hydraulic frame (1).

3. The hydraulic end overpressure protection device for a fracturing pump according to claim 2, characterized in that, The top of the outer wall of the hydraulic frame (1) is rotatably connected to a buckle (304). When the buckle (304) rotates to the position where it engages with the protective shell (303), it fixes the protective shell (303) that rotates to cover the outlet.

4. The hydraulic end overpressure protection device for a fracturing pump according to claim 1, characterized in that, The elastic coefficient of spring 2 (205) is greater than that of spring 1 (204), so that when the pressure on the inner wall of the hydraulic frame (1) increases, the piston (203) moves in the hollow column (202) before the movable block (206).

5. The overpressure protection device for the hydraulic end of a fracturing pump according to claim 1, characterized in that, An annular sealing ring is provided between the outer wall of the hollow column (202) and the inner wall of the sealing cover (201), and the hollow column (202) slides along the central axis of the sealing cover (201).

6. The hydraulic end overpressure protection device for a fracturing pump according to claim 1, characterized in that, There are multiple telescopic rods (4), which are evenly distributed along the side wall of the hydraulic frame (1), and the number of movable plugs (5) corresponds to the number of telescopic rods (4).

7. The overpressure protection device for the hydraulic end of a fracturing pump according to claim 1, characterized in that, The bottom of the movable block (206) is flush with the bottom of the piston (203) when the piston (203) is in the reset position, and the spring (204) presses the piston (203) down to the inner wall of the hydraulic frame (1) to achieve reset.

8. The hydraulic end overpressure protection device for a fracturing pump according to claim 1, characterized in that, The sealing cap (201) is fixedly installed on the top of the hydraulic frame (1) by bolts.

Images