Reciprocating pump packing assembly and method for quickly disassembling and assembling reciprocating pump packing

Abstract

The invention belongs to the field of packing replacement, and relates to a reciprocating pump packing assembly and a method for quickly disassembling and assembling the reciprocating pump packing, and the reciprocating pump packing assembly is of a magazine type structure formed by screwing a first packing box and a second packing box through screw threads. When the reciprocating pump packing needs to be quickly disassembled and assembled, the second packing box is screwed out of the first packing box by using a hook wrench, and then the packing or other parts in the second packing box are replaced and overhauled. According to the method for rapidly disassembling and assembling the reciprocating pump packing, traditional packing pulling-out is changed into existing screw thread packing disassembling, the replacement time is shortened, and replacement can be completed only by one operator.

Description

Technical Field

[0001] This invention belongs to the field of packing replacement, specifically relating to a reciprocating pump packing assembly and a method for quickly disassembling and assembling reciprocating pump packing. Background Technology

[0002] High-pressure reciprocating pumps have a high maintenance rate. Typically, a high-pressure reciprocating pump has 5 plungers. It takes 1 hour to remove packing using packing tools. However, the threaded hooks of the packing tools often break during use. The main reason is that the used packing has high hardness due to scale buildup, making it difficult to remove. This not only increases the labor intensity of the operator but also affects the water injection efficiency. Therefore, there is an urgent need for a new device that can quickly remove packing. Summary of the Invention

[0003] The purpose of this invention is to provide a reciprocating pump packing assembly and a method for quickly assembling and disassembling the reciprocating pump packing, so as to overcome the above-mentioned technical defects.

[0004] To solve the above technical problems, the present invention provides a reciprocating pump packing assembly, comprising: The first packing box has at least a first channel through which a reciprocating pump plunger passes, and a first thread is provided on the inner wall of the first channel; The second packing box is in the shape of a hollow cylinder. A second thread is provided on the outer wall of the hollow cylinder so that the first packing box and the second packing box are screwed together to form a magazine-like structure. The second packing box has at least a packing suitable for being fitted onto the reciprocating pump plunger.

[0005] According to a reciprocating pump packing assembly, the second packing box includes: The pressure sleeve is a hollow cylinder structure with openings at both ends, and the second thread is provided on the outer wall of the hollow cylinder; A front guide sleeve is installed inside the pressure sleeve and near the bottom end of the pressure sleeve; Packing gland is installed inside the compression sleeve and near the top of the compression sleeve; Packing is disposed between the packing gland and the front guide sleeve.

[0006] According to a reciprocating pump packing assembly, the bottom edge of the pressure sleeve extends horizontally in a radial direction to form an annular support plate; The front guide sleeve sits on the annular support plate.

[0007] According to a reciprocating pump packing assembly, the packing gland includes: A hollow column, the top edge of which extends horizontally in a radial direction to form an annular pressure plate, the annular pressure plate covering the top of the pressure sleeve.

[0008] According to a reciprocating pump packing assembly, the first packing box includes: The stuffing box body is a hollow tubular structure that runs through the axis. Its axial hollow channel serves as the first channel. The first channel is a stepped hole with a large diameter section and a small diameter section. The first thread is set in the large diameter section, and the second packing box is screwed onto the large diameter section. A stuffing gland cover is fitted and installed on the stuffing gland body.

[0009] According to a reciprocating pump packing assembly, the stuffing gland has at least a through hole suitable for the reciprocating pump plunger to pass through; The through hole is a multi-stage stepped hole, and the inner diameter of the multi-stage stepped hole gradually decreases or increases along the axial direction. The inner wall of the largest step hole in the multi-stage stepped hole is threaded, and the stuffing gland cover is screwed onto the stuffing gland body by the thread, and the stuffing gland body and the stuffing gland cover are fastened by a set screw.

[0010] According to a reciprocating pump packing assembly, after the second packing box is placed inside the stuffing box body, the top end of the pressure sleeve is flush with the top end of the stuffing box body. The annular pressure plate of the packing gland is confined within the maximum stepped hole of the stuffing gland.

[0011] According to a reciprocating pump packing assembly, a plurality of sealing rings are provided between the pressure sleeve and the stuffing box body.

[0012] This embodiment also provides a method for quickly removing and installing reciprocating pump packing, suitable for a reciprocating pump packing assembly, the method including the steps of quickly removing the reciprocating pump packing and quickly installing the reciprocating pump packing; The steps for quickly removing the packing of a reciprocating pump include: Remove the stuffing gland cover, unscrew the second packing box from the stuffing gland body, detach the second packing box from the reciprocating pump plunger, and replace or repair the packing. The steps for quickly installing a reciprocating pump packing include: Assemble the second packing box by pushing it into the stuffing box body, and screwing the compression sleeve of the second packing box into the stuffing box body via threads. Then, place the stuffing box cap onto the stuffing box body to compress the packing.

[0013] According to a method for quick disassembly and assembly of reciprocating pump packing, when removing or installing the second packing box during the quick disassembly and assembly of reciprocating pump packing, it is necessary to first remove or install the packing gland and then tighten the gland. The top surface of the pressure sleeve has at least two small holes suitable for inserting a hook wrench; The hook wrench includes at least a semi-circular arc plate, on which at least two cylinders are fixed, the cylinders being inserted into the corresponding small holes, and a handle suitable for the operator to grip is fixed on the semi-circular arc plate.

[0014] This invention proposes a reciprocating pump packing assembly, which is a cartridge-type structure composed of a first packing box and a second packing box connected by threads. When quick disassembly and assembly of the reciprocating pump packing is required, a hook wrench is used to unscrew the second packing box from the first packing box, and then the packing or other components inside the second packing box can be replaced or repaired. This method of quick disassembly and assembly of the reciprocating pump packing replaces the traditional method of removing the packing with threaded unloading, shortening the replacement time and requiring only one operator.

[0015] To make the above description of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is an assembly diagram of the reciprocating pump packing assembly.

[0017] Figure 2 This is an exploded view of the first packing box.

[0018] Figure 3 This is an assembly diagram of the second packing box.

[0019] Figure 4 This is a schematic diagram of the pressure sleeve structure.

[0020] Figure 5 This is a schematic diagram of the stuffing gland.

[0021] Figure 6 This is a structural diagram of a hook wrench.

[0022] Explanation of reference numerals in the attached figures: 10. First packing box; 11. Stuffing gland body; 111. First channel; 112. First thread; 12. Stuffing gland cover; 20. Second packing box; 21. Packing; 22. Press sleeve; 221. Annular support plate; 222. Second thread; 23. Guide sleeve; 24. Packing gland; 241. Annular pressure plate; 30. Set screw; 40. Sealing ring; 50. Hook wrench. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0024] It should be noted that, in this invention, the upper, lower, left, and right in the figure are regarded as the upper, lower, left, and right of the reciprocating pump packing assembly described in this specification.

[0025] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0026] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0027] This implementation method aims to solve the problems of long time, high labor intensity and reduced water injection efficiency when maintaining and replacing packing in high-pressure reciprocating water pumps, three-plunger reciprocating pumps and five-plunger reciprocating pumps. In particular, due to scaling or limited space for packing removal, it takes 1 hour to replace the packing of a five-plunger pump.

[0028] To address the aforementioned problems, this embodiment proposes a reciprocating pump packing assembly. Please refer to [link / reference needed]. Figure 1 It includes a first packing box 10 and a second packing box 20.

[0029] Please combine Figure 1 and Figure 2 The first packing box 10 has at least a first channel 111 through which the reciprocating pump plunger passes, and a first thread 112 is provided on the inner wall of the first channel 111.

[0030] Please combine Figure 1 and Figure 3 , Figure 4 The second packing box 20 is a hollow cylinder, and a second thread 222 is provided on the outer wall of the hollow cylinder so that the first packing box 10 and the second packing box 20 are connected by the thread to form a magazine-type structure. The second packing box 20 has at least a packing 21 suitable for being fitted onto the reciprocating pump plunger.

[0031] That is, the second packing box 20 is placed inside the first packing box 10, and the second thread 222 of the second packing box 20 is screwed to the first thread 112 of the first packing box 10. Compared with the traditional method of removing packing, this embodiment only requires threads to remove packing, reducing the packing replacement time of a five-plunger pump from 1 hour to 20 minutes.

[0032] In some embodiments, please refer to Figure 3 The second packing box 20 includes a pressure sleeve 22, a guide sleeve 23, a packing gland 24, and a packing 21.

[0033] Please see Figure 4 The pressure sleeve 22 is a hollow cylinder structure with openings at both ends, and a second thread 222 is provided on the outer wall of the hollow cylinder. The bottom edge of the pressure sleeve 22 extends horizontally in the radial direction to form an annular support plate 221, and the guide sleeve 23 sits on the annular support plate 221.

[0034] The guide sleeve 23 is installed inside the pressure sleeve 22 and close to the bottom end of the pressure sleeve 22; the packing gland 24 is installed inside the pressure sleeve 22 and close to the top end of the pressure sleeve 22; the packing gland 21 is disposed between the packing gland 24 and the guide sleeve 23.

[0035] That is, inside the pressure sleeve 22, the guide sleeve 23, packing 21 and packing gland 24 are installed sequentially from bottom to top. The axial center lines of the three overlap and together form a central channel with the same inner diameter, through which the reciprocating pump plunger passes.

[0036] Experimental studies have shown that when the packing compression is set to 5% of its total thickness, a good hydraulic seal effect can be achieved, while generating low friction, with a leakage rate of 12 ml per hour and an average friction force of approximately 69.9. In practical applications, this packing compression not only meets the system's sealing performance requirements but also minimizes packing wear and extends the packing's service life. By modifying several high-pressure reciprocating pumps and adopting this optimized packing compression, the average maintenance interval of the equipment has been significantly improved, and maintenance costs have been reduced. Therefore, in this embodiment, the compression of packing 21 is set to 5% of its total thickness.

[0037] In some embodiments, please refer to Figure 5 The packing gland 24 includes a hollow column, the top edge of which extends radially horizontally to form an annular pressure plate 241, which covers the top of the pressure sleeve 22. The function of the packing gland 24 is to press the packing 21 tightly; therefore, refer to... Figure 5 It can be seen that the lower inner wall of the packing gland 24 is conical, and this conical section abuts against the packing 21. That is to say, the packing gland 24 and the packing 21 are pressed together by a conical surface fit. Specifically, the packing gland (second packing box 20) is pressed inward and close to the plunger to achieve a continuous seal that is neither punctured nor leaking.

[0038] Please see Figure 2 The first packing box 10 includes a stuffing box body 11 and a stuffing box cover 12, wherein the stuffing box cover 12 is sleeved and installed on the stuffing box body 11.

[0039] The stuffing box body 11 is a hollow tubular structure that runs through the axis. Its axial hollow channel serves as the first channel 111, which is a stepped hole with a large-diameter section and a small-diameter section. Figure 1 and Figure 2 It can be seen that the first thread 112 is set in the large diameter section, and the second packing box 20 is screwed on in the large diameter section.

[0040] In some embodiments, a new packing box can be fabricated at the packing installation location using the original packing box assembly. This new packing box allows for quick removal and replacement of the packing. The new packing box is described in reference to... Figure 1 Thread threads are made on the outside of the second packing box 20 and on the inside of the first packing box 10. The two are used together to install the packing 21 of the second packing box 20 on the outside of the first packing box 10. The threads are screwed into the first packing box 10 and tightened. Then the stuffing gland cover 12 is tightened to complete the replacement and installation of the packing 21.

[0041] Please continue reading. Figure 2 The stuffing box gland 12 has at least one through hole suitable for the reciprocating pump plunger to pass through. The through hole is a multi-stage stepped hole, with the inner diameter of the multi-stage stepped hole decreasing or increasing progressively along the axial direction, such as... Figure 2 In the middle, the through hole is a three-step hole with the inner diameter gradually decreasing from bottom to top.

[0042] The inner wall of the largest step hole in the multi-stage stepped hole is threaded. The stuffing gland cover 12 is screwed onto the stuffing gland body 11 by the thread, and the stuffing gland body 11 and the stuffing gland cover 12 are fastened by the set screw 30 to prevent relative movement between the two.

[0043] Please see Figure 1 After the second packing box 20 is placed inside the stuffing box body 11, the top of the pressure sleeve 22 is flush with the top of the stuffing box body 11, and the annular pressure plate 241 of the packing gland 24 is confined within the maximum step hole of the stuffing gland gland 12.

[0044] When the stuffing gland cover 12 is tightened onto the stuffing gland body 11, the stuffing gland cover 12 can ensure that the packing 21 is pressed tightly, thereby ensuring the sealing effect.

[0045] Multiple sealing rings 40 are provided between the pressure sleeve 22 and the stuffing box body 11.

[0046] In some embodiments, please combine Figure 1 and Figure 3The sealing ring 40 is fitted on the outer wall of the pressure sleeve 22, or an annular groove is opened on the outer wall of the pressure sleeve 22 to accommodate the sealing ring 40, so as to achieve the sealing of the pressure sleeve 22 and the stuffing box body 11 on the inner and outer circumferential surfaces.

[0047] In some embodiments, please combine Figure 1 and Figure 3 The sealing ring 40 is provided on the bottom end face of the pressure sleeve 22, or an annular groove is opened on the bottom end face of the pressure sleeve 22 to accommodate the sealing ring 40, so as to achieve the sealing of the pressure sleeve 22 and the stuffing box body 11 on the stepped surface.

[0048] In some embodiments, please combine Figure 1 and Figure 3 Sealing rings 40 are installed on the side and bottom of the pressure sleeve 22 respectively.

[0049] This embodiment also provides a method for quickly disassembling and assembling reciprocating pump packing, suitable for a reciprocating pump packing assembly. The method for quickly disassembling and assembling reciprocating pump packing includes the steps of quickly removing the reciprocating pump packing and quickly installing the reciprocating pump packing.

[0050] The steps for quickly removing the packing from the reciprocating pump include: removing the stuffing gland 12, unscrewing the second packing box 20 from the stuffing gland body 11. It is worth mentioning that the packing (packing 21) can be replaced directly on the plunger or the connecting clip (the connection between the plunger and the power end) can be loosened directly. Pry open the reciprocating pump plunger, and the second packing box 20 will be detached from the reciprocating pump plunger. Replace or repair the packing 21.

[0051] The steps for quickly installing packing for a reciprocating pump include: assembling the second packing box 20, pushing the second packing box 20 into the stuffing box body 11, so that the pressure sleeve 22 of the second packing box 20 is screwed into the stuffing box body 11 by threads, and taking the stuffing box cover 12 and putting it on the stuffing box body 11 to compress the packing 21.

[0052] In some embodiments, the stuffing box body 11 is installed on the reciprocating pump plunger, the second packing box 20 is assembled, the second packing box 20 (excluding the packing gland 24) is pushed into the stuffing box body 11, the gland 22 is tightened using a hook wrench 50, the packing gland 24 is then removed to press the packing 21, and finally the stuffing box gland 12 is removed to press the second packing box 20.

[0053] During the process of quickly disassembling and assembling the reciprocating pump packing, the principle of the magazine is used, that is, the second packing box 20 is disassembled from the stuffing box body 11 by using the threads, so as to replace the packing 21.

[0054] Please see Figure 6During the rapid disassembly and assembly of the reciprocating pump packing, when removing or installing the second packing box 20, the packing gland 24 needs to be removed first, and then the pressure sleeve 22 needs to be screwed on. The top surface of the pressure sleeve 22 has at least two small holes suitable for inserting the hook wrench 50. The hook wrench 50 includes at least a semi-circular plate, on which at least two cylinders are fixed. The cylinders are used to be inserted into the corresponding small holes. A handle suitable for the operator to grip is fixed on the semi-circular plate.

[0055] In some embodiments, such as Figure 6 As shown, two cylinders are distributed at 180 degrees at both ends of the semi-circular arc plate, and the handle is fixed at the center of the semi-circular arc plate, that is, on the radius extension line passing through the center of the circle, which facilitates the application of force.

[0056] In addition, in order to solve the problem caused by insufficient strength of the reciprocating pump plunger material, this embodiment uses supersonic flame spraying technology to coat the surface of the reciprocating pump plunger with a layer of metal oxide ceramic, which improves the wear resistance and corrosion resistance of the reciprocating pump plunger. The service life of the treated reciprocating pump plunger is 5 times that of the untreated one.

[0057] Field application results: The reciprocating pump plunger treated with HVOF (High-velocity Explosive Flame) technology has significantly improved the operational stability of the reciprocating pump in the high-pressure reciprocating pump, reduced leakage problems caused by plunger wear, extended the equipment maintenance cycle, and improved production efficiency.

[0058] This invention proposes a reciprocating pump packing assembly with a magazine-like structure consisting of a first packing box and a second packing box connected by threaded screws. When quick disassembly and assembly of the reciprocating pump packing is required, a hook wrench is used to unscrew the second packing box from the first packing box, allowing for subsequent replacement or repair of the packing or other components within the second packing box. This method of quick disassembly and assembly of the reciprocating pump packing replaces the traditional method of removing the packing with threaded screws, shortening replacement time and requiring only one operator.

[0059] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A reciprocating pump packing assembly, characterized in that, include: The first packing box (10) has at least a first channel (111) through which a reciprocating pump plunger passes, and a first thread (112) is provided on the inner wall of the first channel (111). The second packing box (20) is in the shape of a hollow cylinder. A second thread (222) is provided on the outer wall of the hollow cylinder so that the first packing box (10) and the second packing box (20) are connected by the thread to form a magazine-like structure. The second packing box (20) has at least a packing (21) suitable for being fitted onto the reciprocating pump plunger.

2. The reciprocating pump packing assembly according to claim 1, characterized in that, The second packing box (20) includes: The pressure sleeve (22) is a hollow cylinder structure with openings at both ends, and the second thread (222) is provided on the outer wall of the hollow cylinder. A guide sleeve (23) is installed inside the pressure sleeve (22) and near the bottom end of the pressure sleeve (22); Packing gland (24) is installed inside the gland (22) and near the top of the gland (22); Packing (21) is disposed between the packing cap (24) and the guide sleeve (23).

3. The reciprocating pump packing assembly according to claim 2, characterized in that, The bottom edge of the pressure sleeve (22) extends horizontally in the radial direction to form an annular support plate (221). The guide sleeve (23) sits on the annular support plate (221).

4. The reciprocating pump packing assembly according to claim 2, characterized in that, The packing gland (24) includes: A hollow column, the top edge of which extends horizontally in the radial direction to form an annular pressure plate (241), the annular pressure plate (241) covering the top of the pressure sleeve (22).

5. The reciprocating pump packing assembly according to claim 4, characterized in that, The first packing box (10) includes: The stuffing box body (11) is a hollow tubular structure that runs through the axial direction. Its axial hollow channel serves as the first channel (111). The first channel (111) is a stepped hole. The stepped hole has a large diameter section and a small diameter section. The first thread (112) is set in the large diameter section, and the second packing box (20) is screwed onto the large diameter section. A stuffing gland cover (12) is fitted onto the stuffing gland body (11).

6. The reciprocating pump packing assembly according to claim 5, characterized in that, The stuffing gland (12) has at least a through hole suitable for the reciprocating pump plunger to pass through; The through hole is a multi-stage stepped hole, and the inner diameter of the multi-stage stepped hole gradually decreases or increases along the axial direction. The inner wall of the largest step hole in the multi-stage stepped hole is threaded, and the stuffing gland cover (12) is screwed onto the stuffing gland body (11) by the thread, and the stuffing gland body (11) and the stuffing gland cover (12) are fastened by the set screw (30).

7. The reciprocating pump packing assembly according to claim 6, characterized in that, After the second packing box (20) is placed inside the stuffing box body (11), the top end of the pressure sleeve (22) is flush with the top end of the stuffing box body (11); The annular pressure plate (241) of the packing gland (24) is confined within the maximum stepped hole of the stuffing gland gland (12).

8. The reciprocating pump packing assembly according to claim 6, characterized in that, Multiple sealing rings (40) are provided between the pressure sleeve (22) and the stuffing box body (11).

9. A method for quickly disassembling and assembling reciprocating pump packing, suitable for the reciprocating pump packing assembly according to any one of claims 5-8, characterized in that, The method includes the steps of quickly removing the packing of the reciprocating pump and quickly installing the packing of the reciprocating pump. The steps for quickly removing the packing of a reciprocating pump include: Remove the stuffing gland cover (12), unscrew the second packing box (20) from the stuffing gland body (11), detach the second packing box (20) from the reciprocating pump plunger, and replace or repair the packing (21). The steps for quickly installing a reciprocating pump packing include: Assemble the second packing box (20), push the second packing box (20) into the stuffing box body (11), and screw the pressure sleeve (22) of the second packing box (20) into the stuffing box body (11) by threading. Take the stuffing box cover (12) and put it on the stuffing box body (11) so that the packing (21) is pressed.

10. The method for quickly disassembling and assembling reciprocating pump packing according to claim 9, characterized in that, During the process of quickly disassembling and assembling the reciprocating pump packing, when removing or installing the second packing box (20), it is necessary to first remove and install the packing cover (24), and then tighten the pressure sleeve (22). The top surface of the pressure sleeve (22) is provided with at least two small holes suitable for inserting a hook wrench (50); The hook wrench (50) includes at least a semi-circular arc plate, on which at least two cylinders are fixed, the cylinders being inserted into the corresponding small holes, and a handle suitable for the operator to grip is fixed on the semi-circular arc plate.

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