A sealing connection structure of a rear cover plate of a power end of a pump

Abstract

The utility model discloses a kind of power end rear cover plate sealing connection structure for pump, including multiple self-locking devices and sealing ring;The self-locking device includes guide column, guide rod and spring, the top surface of the guide column is downwardly provided with slot, and the spring is fixed at the bottom of the slot;The both sides of the guide rod are symmetrically provided with stop lever, the sidewall of the guide column is provided with multiple guide slots, and two The stop lever respectively along the corresponding guide slot slides;The top surface of the guide rod is fixedly provided with rectangular limit block, its bottom surface is abutted with the spring;The self-locking device is horizontally arranged, the bottom of the guide column is fixedly connected with the vertical plate, so that the limit block is towards the rear cover plate;Rectangular hole is provided on the rear cover plate corresponding to the limit block, and the inside of the rear cover plate is provided with accommodating cavity corresponding to each rectangular hole.The utility model solves the leakage problem caused by bolt loosening, and the installation and removal efficiency is higher, which is more conducive to maintenance.

Description

Technical Field

[0001] This utility model relates to the technical field of rear cover plate connection for the power end of a pump. More specifically, this utility model relates to a sealing connection structure for the rear cover plate of the power end of a pump. Background Technology

[0002] High-power pumps (such as fracturing pumps) typically use a bolted structure to secure the rear cover plate and press the gasket together. This method has the following drawbacks: 1. Poor sealing reliability: Bolts are prone to loosening under long-term vibration or breaking under large dynamic loads, leading to a decrease in the gasket's preload and causing leakage; 2. Low maintenance efficiency: Installing or replacing the gasket requires disassembling each bolt individually, which is time-consuming and prone to seal failure due to uneven torque. Although there are improved sealing structures in existing technologies, they still rely on bolt connections and do not fundamentally solve the problems of leakage caused by loose bolts and low maintenance efficiency. Utility Model Content

[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0004] To achieve these objectives and other advantages according to this utility model, a sealing connection structure for the rear cover plate of a pump power end is provided. The power end housing of the fracturing pump has multiple slots on one side, each slot corresponding to a rear cover plate. An upright plate is fixedly installed inside the power end housing near the rear cover plate. The sealing connection structure includes multiple self-locking devices and a sealing ring at the connection between the power end housing and the rear cover plate. Each self-locking device includes a guide post, a guide rod, and a spring. The top surface of the guide post has a downward-facing slot for the guide rod to be inserted into, and the spring is fixed to the bottom of the slot. Stop bars are symmetrically arranged on both sides of the guide rod. The guide post has multiple guide grooves on its side wall. The two stop rods slide along their respective guide grooves, and the guide rods rotate at a certain angle while moving along the slot through the guide grooves. A rectangular limiting block is fixedly installed on the top surface of the guide rod, and its bottom surface abuts against the spring. The self-locking device is horizontally installed, and the bottom of the guide post is fixedly connected to the upright plate so that the limiting block faces the rear cover plate. A rectangular hole is opened on the rear cover plate corresponding to the limiting block, and a receiving cavity is provided inside the rear cover plate corresponding to each rectangular hole. When the stop rod is located at the bottom of the guide groove, the limiting block is directly opposite the corresponding rectangular hole.

[0005] Preferably, each of the self-locking devices is arranged at circumferential intervals along the rear cover plate.

[0006] Preferably, the self-locking device further includes a support frame, the guide post is fixedly disposed in the support frame, and the top of the support frame has a through hole corresponding to the slot.

[0007] Preferably, the guide post includes an upper guide post and a lower guide post symmetrically arranged vertically, the upper guide post and the lower guide post being fixedly connected to the inner top and inner bottom of the support frame, respectively; the opposite end faces of the upper guide post and the lower guide post are provided with continuous sawtooth grooves, and the upper and lower sawtooth grooves are arranged in parallel and corresponding manner.

[0008] Preferably, the serrated groove is a plurality of continuous L-shaped grooves, wherein the L-shaped groove is composed of a short inclined surface and a long inclined surface.

[0009] Preferably, the diameter of the guide rod is greater than the width of the limiting block, and a connecting post is provided between the guide rod and the limiting block, the diameter of the connecting post being smaller than the width of the limiting block.

[0010] Preferably, the outer periphery of the rear cover plate is provided with an annular groove to accommodate the sealing ring.

[0011] This utility model has at least the following beneficial effects: This utility model provides a sealing connection structure for the rear cover plate of a pump's power end. This structure uses multiple self-locking devices and sealing rings to form a mechanical self-locking sealing connection, achieving the connection between the rear cover plate and the power end housing, replacing the traditional bolt connection method. The spring's rebound force continuously provides radial locking force, solving the leakage problem caused by loose bolts. Multiple self-locking devices can be locked and unlocked simultaneously by pressing, resulting in higher installation and disassembly efficiency and easier maintenance compared to sequentially removing multiple bolts.

[0012] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0013] Figure 1 This is a side view of the power end housing of the present invention. Figure 2 This is a schematic diagram showing the installation position of the self-locking device described in this utility model; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the self-locking device described in this utility model. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0015] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] like Figures 1 to 4 As shown, this utility model provides a sealing connection structure for the rear cover plate of a pump power end. The power end housing 100 of the fracturing pump has multiple slots on one side, each slot corresponding to a rear cover plate 200. An upright plate 110 is fixedly installed inside the power end housing 100 near the rear cover plate 200. The sealing connection structure 300 includes multiple self-locking devices 310 and a sealing ring 320 at the connection between the power end housing 100 and the rear cover plate 200. Each self-locking device 310 includes a guide post 312, a guide rod 313, and a spring 311. The top surface of the guide post 312 has a downward-facing slot for the guide rod 313 to be inserted, and the spring 311 is fixed to the bottom of the slot. Stop bars 315 are symmetrically arranged on both sides of the guide rod 313. Multiple guide grooves are provided on the side wall of 312. The two stop rods 315 slide along the corresponding guide grooves respectively. The guide grooves guide the guide rod 313 to rotate at a certain angle while moving along the slot. A rectangular limiting block 316 is fixedly provided on the top surface of the guide rod 313, and its bottom surface abuts against the spring 311. The self-locking device 310 is horizontally arranged. The bottom of the guide post 312 is fixedly connected to the upright plate 110 so that the limiting block 316 faces the rear cover plate 200. A rectangular hole is opened on the rear cover plate 200 corresponding to the limiting block 316, and a receiving cavity 220 is provided inside the rear cover plate 200 corresponding to each rectangular hole. When the stop rod 315 is located at the bottom of the guide groove, the limiting block 316 is directly opposite the corresponding rectangular hole.

[0017] In this technical solution, the self-locking device 310 and the sealing ring 320 constitute a mechanical self-locking sealing connection structure. Figure 1 The image shows the rear side of the power end housing 100, which has multiple slots arranged longitudinally, and each slot corresponds to a rear cover plate 200. Figure 4 This is a schematic diagram of the self-locking device 310 when placed vertically. In actual use, as shown... Figure 2and Figure 3 As shown, the self-locking device 310 is horizontally arranged and welded or bolted to the upright plate 110. During installation, the sealing ring 320 is installed on the rear cover plate 200, and the rear cover plate 200 is pressed against the slot opened on the power end housing. The guide rod 313 in each of the self-locking devices 310 is compressed by the spring 311, and at the same time, the stop rod 315 moves along the guide groove, driving the guide rod 313 to move and rotate along the guide post 312. It can be understood that the shape of the guide groove needs to guide the stop rod 315 so that the guide rod 313 slides and rotates in the slot, and the rotation angle α satisfies 30°<α≤90°, such as an inclined rectangle. When the stop lever 315 is at the bottom of the guide groove, the limiting block 316 is aligned with the corresponding rectangular hole on the rear cover plate 200. At this time, the limiting block 316 enters the receiving cavity 220 through the rectangular hole. Then, when the rear cover plate 200 is no longer pressed, the spring 311 resets, causing the guide rod 313 to move in the opposite direction. Simultaneously, the stop lever 315 moves in the opposite direction along the guide groove, causing the guide rod 313 to rotate synchronously. The limiting block 316 rotates within the receiving cavity 220, thereby misaligning with the rectangular hole to form a mechanical self-lock, sealing the rear cover plate 200 with the power end housing 100. To unlock, press the rear cover plate 200 again. During the compression of the spring 311, the guide rod 313 and the limiting block 316 rotate synchronously. When they rotate to be aligned with the rectangular hole, the limiting block 316 exits the locking area, and then the rear cover plate 200 can be quickly removed. To facilitate applying force to the rear cover plate 200, a handrail 210 is also provided on the rear cover plate 200.

[0018] In another technical solution, the self-locking devices 310 are arranged at intervals along the circumference of the rear cover plate. A plurality of self-locking devices 310 are arranged in a circle around the circumference of the rear cover plate 200 to collectively ensure the stability of the sealing connection.

[0019] In another technical solution, the self-locking device 310 further includes a support frame 314, the guide post 312 is fixedly disposed within the support frame 314, and the top of the support frame 314 has a through hole corresponding to the slot. The structure of the support frame 314 is as follows: Figure 4 As shown, it includes a top plate, a bottom plate, and multiple columns between the two. The support frame 314 can increase the contact area between the guide column 312 and the upright plate 110, making the connection more stable; it can also support the segmented setting of the guide column 312.

[0020] Furthermore, the guide post 312 includes an upper guide post 3121 and a lower guide post 3122 symmetrically arranged vertically. The upper guide post 3121 and the lower guide post 3122 are fixedly connected to the inner top and inner bottom of the support frame 314, respectively. The opposite end faces of the upper guide post 3121 and the lower guide post 3122 are each provided with continuous serrated grooves, and the upper and lower serrated grooves are arranged in parallel and corresponding positions. The upper guide post 3121 and the lower guide post 3122 form the movable space of the stop bar 315, and provide guidance through the upper and lower serrated grooves. The upper and lower serrated grooves have the same shape, with the tooth tip of the upper serrated groove corresponding to the groove bottom of the lower serrated groove. The distance h between the upper guide post 3121 and the lower guide post 3122 is the vertical movement distance of the guide rod 313. When the stop rod 315 is located in the sawtooth groove of the lower guide post 3122, the distance between the top surface of the limiting block 316 and the upright plate is h1. When the bottom surface of the limiting block enters the receiving cavity 220, the distance between its top surface and the upright plate 110 is h2. Therefore, h = h2 - h1.

[0021] Specifically, the serrated groove is a plurality of continuous L-shaped grooves, each L-shaped groove consisting of a short inclined surface and a long inclined surface. (Refer to...) Figure 4 When the stop lever 315 moves upward from the bottom of the lower L-shaped groove, after a vertical movement, it first encounters the long inclined surface of the upper L-shaped groove, and then reaches the bottom of the upper L-shaped groove along the guide of the long inclined surface. During this process, it causes the guide rod 313 to rotate counterclockwise by a certain angle. When the stop lever 315 moves downward from the bottom of the upper L-shaped groove, after a vertical movement, it first encounters the long inclined surface of the lower L-shaped groove, and then reaches the bottom of the lower L-shaped groove along the guide of the long inclined surface. During this process, it causes the guide rod 313 to rotate clockwise by a certain angle, and at this time, the limiting block 316 at the top of the guide rod 313 is aligned with the rectangular hole on the rear cover plate 200. (Refer to...) Figure 4 The angle between the projection lines of the two sides of the long inclined surface of the upper guide post 3121 along the moving direction of the stop rod 315 on the horizontal plane is the rotation angle α of the guide rod 313.

[0022] In another technical solution, the diameter of the guide rod 313 is larger than the width of the limiting block 316, and a connecting post 317 is provided between the guide rod 313 and the limiting block 316. The diameter of the connecting post 317 is smaller than the width of the limiting block 316. To ensure the stability of the movement of the guide rod 313, its diameter cannot be too small. When the diameter of the guide rod 313 is larger than the width of the limiting block 316, the connecting post 317 provides a transition, allowing the limiting block 316 to smoothly rotate after entering the receiving cavity 220.

[0023] In another technical solution, the outer periphery of the rear cover plate 200 is provided with an annular groove to accommodate the sealing ring 320. The annular groove is used to install the sealing ring 320 to ensure that the sealing ring 320 does not shift during the installation of the rear cover plate 200.

[0024] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A sealing connection structure for a pump's power end rear cover plate, wherein a plurality of slots are provided on one side of the power end housing of a fracturing pump, and each slot is correspondingly provided with a rear cover plate; a vertical plate is fixedly provided inside the power end housing near the rear cover plate; characterized in that, The sealing connection structure includes multiple self-locking devices and a sealing ring disposed at the connection between the power end housing and the rear cover plate. Each self-locking device includes a guide post, a guide rod, and a spring. The top surface of the guide post has a downward-facing slot for the guide rod to be inserted into, and the spring is fixed to the bottom of the slot. Symmetrical stop bars are arranged on both sides of the guide rod. Multiple guide grooves are provided on the sidewall of the guide post. Two stop bars slide along their corresponding guide grooves, and the guide grooves guide the guide rod to rotate at a certain angle while moving along the slot. A rectangular limiting block is fixedly disposed on the top surface of the guide rod, and its bottom surface abuts against the spring. The self-locking device is horizontally positioned, and the bottom of the guide post is fixedly connected to the upright plate so that the limiting block faces the rear cover plate. A rectangular hole is provided on the rear cover plate corresponding to the limiting block, and a receiving cavity is provided inside the rear cover plate corresponding to each rectangular hole. When the stop bar is at the bottom of the guide groove, the limiting block is directly opposite the corresponding rectangular hole.

2. The sealing connection structure of the rear cover plate of the power end of the pump as described in claim 1, characterized in that, Each of the self-locking devices is arranged at intervals along the circumference of the rear cover plate.

3. The sealing connection structure of the rear cover plate of the power end of the pump as described in claim 1, characterized in that, The self-locking device also includes a support frame, the guide post is fixedly installed in the support frame, and the top of the support frame has a through hole corresponding to the slot.

4. The sealing connection structure of the rear cover plate of the power end of the pump as described in claim 3, characterized in that, The guide post includes an upper guide post and a lower guide post symmetrically arranged vertically. The upper guide post and the lower guide post are fixedly connected to the inner top and inner bottom of the support frame, respectively. The opposite end faces of the upper guide post and the lower guide post are provided with continuous sawtooth grooves, and the upper and lower sawtooth grooves are arranged in parallel and corresponding to each other.

5. The sealing connection structure of the rear cover plate of the power end of the pump as described in claim 4, characterized in that, The serrated groove is a series of continuous L-shaped grooves, each L-shaped groove consisting of a short inclined surface and a long inclined surface.

6. The sealing connection structure of the rear cover plate of the power end of the pump as described in claim 1, characterized in that, The diameter of the guide rod is greater than the width of the limiting block, and a connecting post is provided between the guide rod and the limiting block, the diameter of the connecting post being smaller than the width of the limiting block.

7. The sealing connection structure of the rear cover plate of the power end of the pump as described in claim 1, characterized in that, The outer periphery of the rear cover plate is provided with an annular groove to accommodate the sealing ring.

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