A leak-proof, normally lubricated high pressure plunger pump packing gland assembly

Abstract

The utility model discloses a kind of anti-piercing, normal lubrication's high-pressure plunger pump packing gland assembly, packing gland body with sealing packing is equipped, and the two sides of sealing packing in packing gland body threadedly connected with gland are respectively equipped with guide ring and copper pressure sleeve;Water supply passage in packing gland body one end is communicated with water supply branch pipe through guide joint, other end is communicated with water supply hole and water storage cavity in copper pressure sleeve;Sealing packing is the cylinder with packing interlayer and one end outer circle is arc, plunger can reciprocate in copper pressure sleeve and sealing packing in packing gland body. The service life of sealing packing therein, maintenance is convenient to replace, can prevent high-pressure water pierce leakage, guarantee the normal operation of high-pressure plunger pump. The utility model can be applied to oilfield water injection, injection polymer, injection steam, drilling and other production sites in petroleum industry high-pressure plunger pump, can also be applied in high-pressure plunger pump in other industries such as chemical industry, with remarkable use effect and application value.

Description

Technical Field

[0001] This utility model relates to high-pressure plunger pumps used in oilfield water injection, polymer injection, steam injection, drilling and other technical fields in the petroleum development industry, and in particular a high-pressure plunger pump stuffing box assembly that is leak-proof and constantly lubricated. Background Technology

[0002] In oilfield development, water injection, polymer injection, and steam injection are crucial means to improve oilfield development levels and maintain reservoir energy, and are among the main measures to ensure stable oilfield production. Plunger-type water injection pumps are one of the most important pieces of mechanical equipment in oil extraction, playing a vital role in water injection processes. They are widely used in oilfield water injection, polymer injection, and steam injection systems, significantly impacting oil extraction efficiency and yield. The seal between the high-pressure liquid and the moving plunger in the plunger pump is primarily achieved through the sealing packing and stuffing box assembly.

[0003] Currently used plunger pump stuffing box assemblies consist of a gland pressing a copper sleeve, which in turn presses the packing, also known as packing or sealing element, tightly against the plunger's working surface, providing a seal. Because of this close contact between the plunger and packing, fluid only leaks through the gap between them after wear occurs, providing some cooling and lubrication. However, high-speed reciprocating motion causes intense friction between the plunger and packing, leading to overheating and potential burnout. This also generates debris, which, along with impurities in the liquid, is carried into the sealing surface between the packing and plunger, quickly causing punctures and leaks.

[0004] Currently, some plunger pump stuffing box assemblies include water seal rings and coolant. However, installing or replacing the water seal ring requires removing it, significantly increasing workload. Furthermore, it's impossible to replenish the packing; the entire stuffing box assembly must be disassembled and replaced. A V-shaped guide ring needs to be installed on the pump head side of the packing. The edge of the V-shaped guide ring is thin, making it prone to wear and cracking, thus shortening the packing's lifespan. The packing's lifespan is also short due to its material and structure. The overflow pipe and guide joint must be installed close to the stuffing box cap, limiting the number of threads that can be tightened, leading to cap slippage and posing a safety hazard of leaking large amounts of high-pressure water. Therefore, a new plunger pump stuffing box assembly that solves these problems is needed.

[0005] A search revealed the following existing technologies similar to the plunger pump stuffing box assembly: 1. The lubricated plunger pump stuffing box assembly disclosed in authorization announcement number CN206448933U mainly consists of a body, positioning bosses, adjusting nuts, pressure sleeves, screws, lubrication screw holes, plunger holes, adjusting holes, outer annular grooves, oil passages, and inner annular grooves. The body has four evenly distributed trapezoidal positioning bosses along its outer circumference on the left end, and an external thread that mates with the adjusting nut on the right end. The pressure sleeve is inserted into the inner cavity of the right end of the body and tightened by the adjusting nut. The adjusting nut has a circular adjusting nut at its axial center and six adjusting holes along its outer circumference. Six lubrication screw holes communicating with the adjusting nut are located on the same axis at the left end of the adjusting holes, and these lubrication screw holes mate with the screws. The pressure sleeve has an inner annular groove on the left end of its inner cavity, and an outer annular groove on the stepped portion of the right end. An oil passage communicating with the inner cavity of the pressure sleeve is located along the bottom of the outer annular groove. It reduces wear on packing and plungers caused by debris, and plays a role in lubrication and cooling, extending the packing replacement cycle, reducing material consumption, and improving pump operating efficiency.

[0006] The above-mentioned device still has the following defects: the device mainly relies on lubrication screw holes for lubrication, and the use of traditional packing will still generate debris. Although some of the debris generated by the movement is sent into the groove at the front end of the pressure sleeve, there are hidden dangers, which reduce the service life and efficiency of the equipment. Most of the packing debris is sent into the pump head and water injection process, affecting the pump efficiency of the water injection pump.

[0007] 2. The patent announcement CN211975883U discloses a liquid-sealed, anti-puncture, anti-detachment stuffing box for a plunger pump. It comprises a stuffing box housing, a drain groove, a guide joint, an overflow pipe, a pump head, a square pressure plate, packing, a water seal ring, a non-metallic sealing ring, a packing gland, a stuffing box cap, and a plunger. The stuffing box incorporates a skeleton-type annular support water seal ring, with an annular space between it and the plunger. Threaded holes, a guide joint, and an overflow pipe are added to the stuffing box wall corresponding to the water seal ring. The liquid stored in the annular space at the water seal ring provides cooling and lubrication for the packing and plunger. Once the water seal ring is full, the liquid flows out through the overflow pipe, allowing for remote monitoring of packing leakage via video. A non-metallic sealing ring is added to the bottom of the packing, with a shallow threaded curve at the contact surface with the plunger, forming a labyrinth seal to prevent detached packing debris from entering the liquid flow.

[0008] The device still has the following defects: The screw-in threads of the stuffing box cap and the outer wall of the stuffing box are limited by the installation position of the guide joint, resulting in a small width and few threads on the stuffing box cap. When corrosion or piston pump vibration occurs, the stuffing box cap is prone to buckling or loosening, easily colliding with the piston connection card of the moving piston pump and causing equipment damage. The packing has a short service life, and packing debris easily falls off, causing poor pump and valve sealing and reduced pump efficiency. A water seal ring needs to be installed inside the stuffing box; replacing the packing requires removing the water seal ring, increasing the workload significantly. The limited number of threads on the stuffing box cap leads to the possibility of the cap coming loose, resulting in a safety hazard of leaking large amounts of high-pressure water.

[0009] 3. The plunger pump hydraulic end disclosed in authorization announcement number CN217152278U has a drain hole at the bottom of its hydraulic end housing that is sequentially connected to a drain pipe, a sewage recovery pipe of the plunger pump, and a sewage circulation pool. The stuffing box housing also contains modified packing. The stuffing box housing is equipped with an overflow pipe and a cooling water supply pipe. The cooling water supply main valve in the stuffing box cooling and lubrication process is connected to the pump inlet pipeline. The cooling water supply pipe installed in the stuffing box housing of each hydraulic end housing of the plunger pump is respectively connected to a pressure measuring valve equipped with a pressure gauge in the stuffing box cooling and lubrication process. An induction transmitter is also fixed at the bottom of the crankcase outer wall inside the hydraulic end housing, and the induction transmitter is wirelessly connected to a converter in the electrical control cabinet of the water injection pump room. This utility model can ensure immediate alarm and automatic pump shutdown protection after equipment failure, promoting the development of plunger pump use towards automation, informatization, and intelligence, and has significant practical effects.

[0010] The device still has the following drawbacks: The patented technology requires a water seal ring to be installed inside the stuffing box, and the water seal ring must be removed when replacing the stuffing, increasing the workload significantly. It also cannot replenish the stuffing; the entire stuffing box assembly must be disassembled and replaced. Furthermore, "V"-shaped guide rings are required on both sides of the stuffing. The edges of these guide rings are thin, making them prone to wear and cracking, thus shortening the stuffing's lifespan. The stuffing's lifespan is also short due to its material and structure. The overflow pipe must be installed close to the stuffing box cap, limiting the number of threads on the cap and leading to the cap coming loose, potentially causing a large leak of high-pressure water and posing a safety hazard. This invention avoids these drawbacks. Summary of the Invention

[0011] The purpose of this invention is to provide a leak-proof, constantly lubricated stuffing box assembly for high-pressure plunger pumps. This addresses the problems of short service life, difficult replacement, and high-pressure water leakage risks associated with existing plunger pump stuffing box assemblies. The invention extends the service life of the sealing packing, facilitates maintenance and replacement, and prevents high-pressure water leakage. This ensures the normal operation of the high-pressure plunger pump and improves its application efficiency.

[0012] To solve the above-mentioned technical problems, the technical solution of this utility model is: a puncture-proof and constantly lubricated high-pressure plunger pump stuffing box assembly, including a stuffing box body containing sealing packing, wherein: guide rings and copper pressure sleeves are respectively installed on both sides of the sealing packing in the stuffing box body which is threaded to the gland; one end of the water supply channel in the stuffing box body is connected to the water supply branch pipe through a guide joint, and the other end is connected to the water supply hole and water storage cavity in the copper pressure sleeve; the sealing packing is a cylindrical body with a packing jacket and one end of the outer circle is arc-shaped, and the plunger can reciprocate in the copper pressure sleeve and sealing packing in the stuffing box body.

[0013] Preferably, the guide ring has a planar structure.

[0014] Preferably, the filler interlayer is made of composite rubber material, and outside the filler interlayer is a filler outer layer, which is made of polymer nanomaterial.

[0015] Preferably, the water supply channel is a hole drilled into the stuffing box from one end of the pressure cap; the length of the water supply channel is more than 4 cm longer than the length of the threaded connection section at the right end of the stuffing box.

[0016] Preferably, the left end of the water supply channel is connected to the water inlet in the guide joint, and the right end is connected to the water supply tank; the water supply tank is connected to the main body of the right end of the stuffing box.

[0017] Preferably, the copper sleeve is a T-shaped cylinder with a sleeve sealing groove in the large-diameter section on the right side, and a sealing ring is installed in the sleeve sealing groove; the inner diameter of the sleeve sealing groove is larger than the diameter of the central hole of the copper sleeve.

[0018] Preferably, a water receiving groove is provided on the outer wall of the small-diameter section on the left side of the copper pressure sleeve, which is connected to the water supply hole. The water receiving groove is connected to the water supply hole and the right end of the groove extends to the root of the large-diameter section of the copper pressure sleeve. The water receiving groove corresponds to the water supply groove at the right end of the water supply channel.

[0019] Preferably, the water storage cavity is a groove with an inner diameter larger than the center hole of the copper pressure sleeve and corresponding to the water supply hole.

[0020] Preferably, a keyway is provided on the outer wall of the small-diameter section corresponding to the water receiving groove in the copper pressure sleeve. The keyway is an axial groove provided on the outer wall of the small-diameter section of the copper pressure sleeve and a positioning key can be installed in the keyway.

[0021] Preferably, the inner circle of the right end of the stuffing box is provided with a keyway corresponding to the pressure sleeve keyway and the positioning key, and the positioning key is connected between the pressure sleeve keyway and the stuffing box keyway.

[0022] Compared with the prior art, the significant advantages of this utility model are as follows: 1. The sealing packing in this device is a composite structure with a packing jacket, which is wear-resistant, has good sealing performance, low frictional resistance, reduces energy consumption, and improves pump efficiency. The outer layer of the sealing packing is made of a high-molecular nanomaterial with extremely low friction, and the interior is filled with a composite rubber material with good elasticity, resulting in good sealing performance, low frictional resistance, and reduced energy consumption of the plunger pump, thus improving pump efficiency. Sealing packings of other materials and shapes are also suitable for installation in this device and are within the protection range of this device.

[0023] 2. The straight edge of the sealing packing can open and close with the reciprocating motion of the plunger. When the plunger returns, under the combined action of high-pressure water pressure, friction, and rubber elasticity, the straight edge increases and tightly fits the plunger surface, effectively sealing the high-pressure liquid. When the plunger compresses, under the action of friction, the straight edge decreases, and the liquid film tightly fitting the plunger surface enters the gap between the packing and the plunger, playing a role in cooling and lubrication. 3. The copper pressure sleeve is equipped with a liquid storage structure consisting of a liquid storage chamber, a water supply hole and a water receiving tank, which can cool and lubricate the plunger and sealing packing, and prevent damage to the packing and plunger caused by frictional heat.

[0024] 4. The built-in water supply channel in the stuffing box ensures water supply without affecting the installation of the gland. The increased number of connecting threads effectively prevents gland disengagement and avoids high-pressure water leakage. This effectively improves pump efficiency, reduces energy consumption, and eliminates safety hazards. 5. A pressure sleeve sealing groove was added at the copper pressure sleeve, which cooperates with the sealing ring to seal the liquid in the water storage cavity, so that the liquid in the water storage cavity always maintains a slight positive pressure, which facilitates the adhesion of a liquid film on the plunger surface and effectively cools and lubricates the plunger and sealing packing.

[0025] 6. A keyway is provided at the copper pressure sleeve. The copper pressure sleeve is connected to the stuffing box by a positioning key, which can prevent the copper pressure sleeve from rotating and ensure the normal water supply of the liquid storage structure.

[0026] This invention can be applied to high-pressure plunger pumps in oilfield water injection, polymer injection, steam injection, and drilling operations within the petroleum industry, and can also be used in high-pressure plunger pumps in other industries such as chemical engineering. It has significant practical effects and application value. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Schematic diagram of the copper pressure sleeve structure; Figure 3 yes Figure 1Schematic diagram of the sealing packing structure; In the diagram: 1. Packing gland body, 2. Inlet hole, 3. Inlet interface, 4. Guide joint, 5. Water supply channel, 6. Water supply trough, 7. Water inlet hole, 8. Copper pressure sleeve, 9. Sealing ring, 10. Water storage cavity, 11. Pressure sleeve sealing groove, 12. Pressure cap, 13. Positioning key, 14. Gland body keyway, 15. Gland body threaded connection section, 16. Pressure sleeve keyway, 17. Sealing packing, 18. Positioning step, 19. Main water supply pipe, 20. Water distribution valve group, 21. Water supply branch pipe, 22. Guide ring, 24. Plunger, 23. Packing jacket, 25. Outer layer of packing, 26. Detailed Implementation

[0028] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of 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 some embodiments of this utility model, not all embodiments. 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.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] See Figures 1-3 A high-pressure plunger pump stuffing box assembly with anti-puncture and leakage and constant lubrication includes a stuffing box body 1 containing sealing packing 18, wherein: guide rings 24 and copper pressure sleeves 9 are respectively installed on both sides of the sealing packing 18 in the stuffing box body 1 which is threaded to the gland 13; one end of the water supply channel 5 in the stuffing box body 1 is connected to the water supply branch pipe 22 through the guide joint 4, and the other end is connected to the water supply hole 7 and the water storage chamber 11 in the copper pressure sleeve 9; the sealing packing 18 is a cylindrical body with a packing jacket 25 and one end of the outer circle is arc-shaped, and the plunger 23 can reciprocate in the copper pressure sleeve 9 and the sealing packing 18 in the stuffing box body 1.

[0032] To overcome the problems of short service life, difficulty in replacing sealing packing, and risk of high-pressure water leakage in existing plunger pump stuffing box assemblies, this utility model incorporates a water supply channel 5 within the stuffing box body 1. One end of the water supply channel 5 is connected to the water supply branch pipe 22 via a guide connector 4, and the other end is connected to the water supply hole 7 and water storage chamber 11 in the copper pressure sleeve 9. Cooling water supplied to the water supply branch pipe 22 through the main water supply pipe 20 and the water distribution valve group 21 enters the water supply channel 5 through the guide connector 4 and connects to the water storage chamber 11 through the water supply hole 7 in the copper pressure sleeve 9.

[0033] Through the water supply process consisting of the main water supply pipe 20, the water distribution valve group 21, and the water supply branch pipes 22, water can be continuously supplied from the inlet of the water injection pump, ensuring that the water storage chamber 11 always has sufficient water. One end of the sealing packing 18 is an arc-shaped outer circle, and the other end is a straight edge. The straight edge at the other end opens and closes accordingly with the reciprocating motion of the plunger 23, which not only seals the high-pressure liquid at the pump head end but also, under the action of the liquid surface tension, carries the liquid adhering to the surface of the plunger 23 into the gap between the plunger 23 and the sealing packing 18, thus cooling and lubricating both the sealing packing 18 and the plunger 23.

[0034] The plunger 23 reciprocates within the copper sleeve 9 and sealing packing 18 in the stuffing box 1. The cooling water entering the water storage chamber 11 in the copper sleeve 9 forms a liquid film on the surface of the plunger 23 reciprocating within it, which can effectively cool and maintain the lubrication of the plunger 23 and sealing packing 18, thus effectively extending the service life of the sealing packing 18.

[0035] Since the water storage chamber 11 is always filled with liquid, most of the reciprocating plunger 23 passes through the water storage chamber 11 during its reciprocating motion, providing good cooling. When the plunger 23 moves to the left pump head end, under the action of the liquid surface tension, the liquid adhering to the surface of the plunger 23 is carried into the gap between the plunger 23 and the sealing packing 18, which cools and lubricates the sealing packing 18 and the plunger 23. When the plunger 23 moves to the right power end, under the combined action of the elastic force and friction at one end of the straight edge of the sealing packing 18, the straight edge of the sealing packing 18 opens, sealing the high-pressure liquid at the pump head end. The positioning step 19 on the left side of the stuffing box 1 is pressed by the square pressure plate of the pump head, and the connection between the stuffing box 1 and the pump head is achieved through the bolts in the square pressure plate.

[0036] Because the water seal ring was eliminated in the stuffing box 1, its function is achieved through the water supply hole 7 and water storage cavity 11 machined in the improved copper gland 9, increasing the connection length of the threaded connection between the gland 13 and the stuffing box 1. On the other hand, a water supply channel 5 was machined inside the stuffing box 1, allowing the original position of the guide connector 4 to be moved to the left, further increasing the connection length of the threaded connection between the gland 13 and the stuffing box 1, effectively preventing and avoiding disengagement between the gland 13 and the stuffing box 1. This ensures that the sealing packing 18 and the plunger 23 are adequately lubricated, effectively preventing high-pressure water leakage.

[0037] Because the water seal ring is eliminated in the stuffing box 1, and guide rings 24 and copper pressure sleeves 9 are installed on both sides of the sealing packing 18, the disassembly and replacement of the sealing packing 18 in the stuffing box 1 is very convenient. While facilitating the maintenance and replacement of the sealing packing 18, this utility model significantly extends the maintenance cycle of the stuffing box assembly, ensures the normal operation of the high-pressure plunger pump, and improves the efficiency of the high-pressure plunger pump.

[0038] Based on the above embodiment one, the present invention also has the following embodiments: A preferred embodiment: The ring body of the guide ring 24 is a planar structure. Because the shape of the sealing packing 18 has been improved, it is no longer a conical structure, and the structure of the guide ring 24 that cooperates with it has also been changed from the original "V"-shaped structure to a planar structure. This eliminates the shortened lifespan of the sealing packing 18 caused by the thinner edge of the "V"-shaped guide ring, which is prone to wear and cracking, thus further improving the service life of the sealing packing 18.

[0039] In a preferred embodiment, the packing interlayer 25 is made of a composite rubber material, and an outer packing layer 26 is made of a polymer nanomaterial. The composite rubber material can be a high-elasticity, high-hardness rubber composite material, a high-elasticity, environmentally friendly rubber composite material with a nano-reinforced microporous structure, a composite rubber spring, or other materials. The polymer nanomaterial can be nanopowder, nanofiber, or a polymer nanocomposite material. The improved manufacturing material of the sealing packing 18 gives the packing interlayer 25 high elasticity and the outer packing layer 26 minimal friction, resulting in good sealing performance, low frictional resistance, reduced overall energy consumption of the plunger pump, and improved pump efficiency. The internal filling with a highly elastic composite rubber material as the packing interlayer 25 utilizes its elastic deformation capability to ensure the sealing packing 18 tightly adheres to the surface of the plunger 23, enhancing sealing performance, preventing leakage of high-pressure liquid inside the pump, and thus improving the working efficiency of the plunger pump. The combination of these two materials achieves the dual advantages of "low friction" and "high sealing." The sealing packing 18 can open and close with the reciprocating motion of the plunger 23. When the plunger 23 returns, under the combined action of high-pressure water pressure, friction, and the composite rubber elasticity in the packing jacket 25, its straight edge increases and tightly adheres to the surface of the plunger 23, effectively sealing the high-pressure liquid. When the plunger 23 compresses, under the action of friction, the straight edge shrinks, and the liquid film tightly adhering to the surface of the plunger 23 enters the gap between the sealing packing 18 and the plunger 23, playing a role in cooling and lubrication.

[0040] In a preferred embodiment, the water supply channel 5 is a hole drilled into the stuffing box 1 from one end of the pressure cap 13; the length of the water supply channel 5 is at least 4 cm longer than the length of the threaded connection section 16 at the right end of the stuffing box 1. This leaves sufficient installation space for the guide connector 4.

[0041] In a preferred embodiment: the left end of the water supply channel 5 is connected to the water inlet 3 in the guide connector 4, and the right end is connected to the water supply tank 6; the water supply tank 6 is connected to the main body of the right end of the stuffing box 1. An internal water supply channel 5 is designed inside the stuffing box 1, and the guide connector 4 can be installed at any location corresponding to the water supply channel 5.

[0042] In a preferred embodiment, the copper sleeve 9 is a T-shaped cylinder with a sleeve sealing groove 12 on the large-diameter section on the right side. A sealing ring 10 is installed in the sleeve sealing groove 12. The inner diameter of the sleeve sealing groove 12 is larger than the diameter of the central hole of the copper sleeve 9. The design of the sleeve sealing groove 12 on the copper sleeve 9, with the sealing ring 10 installed inside, effectively prevents liquid leakage from the water storage chamber 11 when the sealing ring 10 is tightly fitted to the sleeve sealing groove 12. This ensures that the liquid always acts on the plunger 23 and the sealing packing 18, maintaining cooling and lubrication effects. Simultaneously, it also prevents external impurities from entering the water storage chamber 11, avoiding contamination of the liquid or damage to components.

[0043] In a preferred embodiment, a water receiving groove 8 communicating with the water supply hole 7 is provided on the outer wall of the small-diameter section on the left side of the copper sleeve 9. The water receiving groove 8 communicates with the water supply hole 7 and its right end extends to the root of the large-diameter section of the copper sleeve 9. The water receiving groove 8 corresponds to the water supply groove 6 at the right end of the water supply channel 5. To ensure that the water storage chamber 11 can continuously receive liquid replenishment, this utility model designs a water supply hole 7 and a water receiving groove 8 on the copper sleeve 9. The water supply hole 7 serves as a channel for liquid entry, allowing external water sources to be introduced; the water receiving groove 8 guides and collects the liquid, preventing liquid loss during transmission and ensuring that the collected liquid flows efficiently into the water storage chamber 11, thus ensuring a stable liquid supply required for the cooling and lubrication of the plunger 23 and the sealing packing 18.

[0044] In a preferred embodiment, the water storage chamber 11 is a groove with an inner diameter larger than the center hole of the copper pressure sleeve 9 and corresponding to the water supply hole 7. The water storage chamber 11 ensures constant lubrication of the plunger 23. The core function of adding a water storage chamber 11 to the copper pressure sleeve 9 is to store a certain amount of liquid. When the plunger pump is running, the liquid in the water storage chamber 11 can directly contact the plunger 23. Under the action of liquid surface tension, some of the water adhering to the surface of the plunger 23 enters the gap between the plunger 23 and the sealing packing 18, absorbing the heat generated by friction through heat exchange, thus achieving continuous cooling of both. At the same time, the liquid forms a lubricating film on the contact surface of the plunger 23, reducing the direct friction between the plunger 23 and the sealing packing 18, thereby reducing component wear and extending service life. Another small portion of the water adhering to the surface of the plunger 23 leaks down through the gap between the plunger 23 and the sealing ring 10 and is recovered by the wastewater recovery system of the high-pressure plunger pump, avoiding the vaporization of the liquid in the storage chamber 11 due to heat generation caused by non-circulation.

[0045] In a preferred embodiment, a keyway 17 is provided on the outer wall of the small-diameter section corresponding to the water receiving groove 8 in the copper pressure sleeve 9. The keyway 17 is an axial groove provided on the outer wall of the small-diameter section of the copper pressure sleeve 9, and a positioning key 14 can be installed in the keyway 17.

[0046] In a preferred embodiment, a keyway 15 corresponding to the keyway 17 and the positioning key 14 is provided on the inner circle of the right end of the stuffing box 1. The positioning key 14 connects the keyway 17 and the keyway 15. This completes the connection between the copper pressure sleeve 9 and the stuffing box 1, as well as the positioning between the water tank 8 and the water supply hole 7, preventing circumferential displacement of the pressure cap 13 during long-term operation of the device. During the threaded connection between the pressure cap 13 and the stuffing box 1, the copper pressure sleeve 9 is pressed downwards and to the left, pressing the sealing packing 18 between the guide ring 24 and the copper pressure sleeve 9, making installation convenient and disassembly simple.

[0047] Installation and working principle of this utility model: 1. First, assemble the stuffing box assembly according to the drawings. First, install the guide ring 24 in the inner cavity of the stuffing box body 1, and then install the sealing packings 18 one by one. The straight edge of the sealing packing 18 faces the left pump head direction; 2. Install the positioning key 14 and the copper pressure sleeve 9; 3. Install the plunger 23 and the pressure cap 13, and install the stuffing box assembly on the plunger pump head. The exposed end of the plunger 23 is connected to the plunger pump connecting rod; 4. Install the water distribution valve group 21: The outer wall of the water distribution valve group 21 is a large round pipe. One end is equipped with a quick connector connected to the main water supply pipe 20, and the other end is equipped with an air release valve. On the side of the water distribution valve group 21, according to the number of plungers of the high-pressure plunger pump, install the corresponding regulating valve and quick connector to facilitate connection with the water supply branch pipe 22; the main water supply pipe 20 is connected to the water distribution valve group 21, and the other end of the main water supply pipe 20 is connected to the water supply process of the plunger pump. The water distribution valve assembly 21 is connected to each water supply branch pipe 22 via regulating valves, and the water supply branch pipes 22 are connected to the water inlet interface 3 in the guide joint 4 of each stuffing box 1. The water inlet hole 2 of the guide joint 4 is connected to the water supply channel 5 and the water supply tank 6 in sequence. The liquid flowing out of the water supply tank 6 enters the water receiving tank 8 of the copper pressure sleeve 9. The water receiving tank 8 of the copper pressure sleeve 9 is connected to the water storage chamber 11 of the copper pressure sleeve 9 via the water supply hole 7. A pressure sleeve sealing groove 12 is added to the copper pressure sleeve 9 and a sealing ring 10 is installed to seal the liquid in the water storage chamber 11. Excess liquid seeps into the wastewater recovery system of the high-pressure plunger pump through the gap between the sealing ring 10 and the plunger 23 and is recovered.

[0048] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A puncture-proof, leak-proof, and constantly lubricated high-pressure plunger pump stuffing box assembly, comprising a stuffing box body filled with sealing packing, characterized in that, The stuffing box body, which is threaded to the gland, has guide rings and copper pressure sleeves installed on both sides of the sealing packing. One end of the water supply channel in the stuffing box body is connected to the water supply branch pipe through a guide joint, and the other end is connected to the water supply hole and water storage cavity in the copper pressure sleeve. The sealing packing is a cylindrical body with a packing jacket and one end of the outer circle is arc-shaped. The plunger can reciprocate in the copper pressure sleeve and sealing packing in the stuffing box body.

2. The anti-puncture and leak-proof, constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 1, characterized in that, The guide ring has a planar structure.

3. The anti-puncture and leak-proof, constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 1, characterized in that, The filler interlayer is made of composite rubber material, and outside the filler interlayer is a filler outer layer, which is made of polymer nanomaterial.

4. The anti-puncture and leak-proof, constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 1, characterized in that, The water supply channel is a hole drilled into the stuffing box from one end of the pressure cap; the length of the water supply channel is more than 4 cm longer than the length of the threaded connection section of the right end of the stuffing box.

5. The anti-puncture and leak-proof, constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 4, characterized in that, The left end of the water supply channel is connected to the water inlet in the guide joint, and the right end is connected to the water supply tank; the water supply tank is connected to the main body of the right end of the stuffing box.

6. The anti-puncture and leak-proof, constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 5, characterized in that, The copper sleeve is a T-shaped cylinder with a sleeve sealing groove in the large-diameter section on the right side, and a sealing ring is installed in the sleeve sealing groove; the inner diameter of the sleeve sealing groove is larger than the diameter of the central hole of the copper sleeve.

7. A puncture-proof, leak-proof, and constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 6, characterized in that... The outer wall of the small-diameter section on the left side of the copper pressure sleeve is provided with a water receiving groove that communicates with the water supply hole. The water receiving groove is connected to the water supply hole and the right end of the groove extends to the root of the large-diameter section of the copper pressure sleeve. The water receiving groove corresponds to the water supply groove at the right end of the water supply channel.

8. The anti-puncture and leak-proof, constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 6, characterized in that, The water storage cavity is a groove with an inner diameter larger than the center hole of the copper pressure sleeve and corresponding to the water supply hole.

9. A puncture-proof, leak-proof, and constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 7, characterized in that... The outer wall of the small-diameter section corresponding to the water receiving groove in the copper pressure sleeve is provided with a pressure sleeve keyway. The pressure sleeve keyway is an axial groove provided on the outer wall of the small-diameter section of the copper pressure sleeve and a positioning key can be installed in the pressure sleeve keyway.

10. A puncture-proof, leak-proof, and constantly lubricated high-pressure plunger pump stuffing box assembly as described in claim 9, characterized in that... The inner circle of the right end of the stuffing box is provided with a keyway corresponding to the pressure sleeve keyway and the positioning key, and the positioning key is connected between the pressure sleeve keyway and the stuffing box keyway.

Images