High-stability piston pump sealing device

Abstract

The high-stability piston pump sealing device comprises an upper connecting support, a front sealing cover plate and a second piston ring set, a shell used for conducting sealing protection on the interior of a piston pump is arranged at the lower end of the upper connecting support, and an embedded groove used for being connected with the shell in a sealed and embedded mode is formed in the front side of the shell. Compared with the prior art, the utility model has the following beneficial effects: the front sealing cover plate and the shell are mechanically embedded and sealed through the embedded groove, and the elastic compensation characteristic of the sealing gasket is combined, so that a double-sealing barrier is realized under a high-pressure working condition (greater than or equal to 20MPa), the leakage rate is reduced to below 0.01 mL / min, and the service life of the sealing gasket is prolonged. The first piston body, the second piston body, the first piston shell and the second piston shell form a symmetrical double-cavity structure, flow dynamic balance is achieved through the control valve and the circulating pipe, the pressure fluctuation range is controlled within + / -2%, the water hammer effect is avoided, and the device overcomes the defects that a traditional piston pump is prone to failure in sealing and high in maintenance frequency through systematic design.

Description

Technical Field

[0001] This utility model belongs to the field of piston pump sealing technology and relates to a highly stable piston pump sealing device. Background Technology

[0002] The main drawbacks of pistons in achieving high-stability sealing lie in their limited sealing performance, wear issues, and the impact of thermal expansion on the sealing effect. The seal between the piston rings and the cylinder wall relies on the ring's elasticity and surface contact; however, this contact often cannot completely prevent gas or liquid leakage, especially under high pressure or high temperature conditions, where the sealing effect significantly decreases. Piston rings are subjected to friction during reciprocating motion, leading to wear. Wear increases the sealing gap, further reducing sealing performance. Conventional solutions include using more wear-resistant materials, optimizing piston ring design, and employing multi-ring sealing structures to improve sealing. However, these methods also have drawbacks. While using more wear-resistant materials can extend the lifespan of the seals, it is more expensive and may not provide the required sealing performance in some cases. Optimizing piston ring design can improve sealing, but increased design complexity can lead to higher manufacturing costs and may not achieve the desired results in practical applications. Therefore, a highly stable piston pump sealing device is urgently needed to address these issues. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a highly stable piston pump sealing device to solve the problems mentioned in the background art.

[0004] This utility model is achieved through the following technical solution: a highly stable piston pump sealing device, comprising: an upper connecting bracket and a piston ring assembly 2, wherein the lower end of the upper connecting bracket is provided with a set of outer shells for sealing and protecting the inside of the piston pump, and the front side of the outer shell is provided with a set of embedded grooves for sealing and fitting with the outer shell.

[0005] The embedded groove is equipped with a set of front sealing cover plates for sealing connection. The front sealing cover plates and the embedded groove are equipped with sealing gaskets. The sealing gaskets provide a sealing fit between the front sealing cover plates and the embedded groove. The front sealing cover plates are equipped with a set of power connectors for introducing external power. In actual use, the front sealing cover plates and the outer shell form a mechanical fitting seal through the embedded groove. Combined with the elastic compensation characteristics of the sealing gaskets, a double sealing barrier is achieved under high pressure conditions (≥20MPa), and the leakage rate is reduced to below 0.01mL / min, which is better than the API 682 standard.

[0006] In a preferred embodiment, the power connector and the front sealing cover are connected by a set of inner connecting bearings for limiting and guiding their movement, and the rear side of the power connector is provided with a set of rotating heads for driving the piston connecting rod one and the piston connecting rod two.

[0007] In a preferred embodiment, the front cross-section of the swivel head is a V-shaped structure. A set of piston connecting rods is located on the inner side of the upper left end of the swivel head to drive the piston body. A set of piston bodies is located at the lower end of the piston connecting rods to pump fluid into the piston shell. The swivel head's V-shaped cross-section design, combined with the precise guidance of the internal connecting bearing, increases the driving torque transmission efficiency to 95%. Simultaneously, it disperses the alternating loads of the piston connecting rods, reducing eccentric wear and extending bearing life by 3 times. The piston bodies and piston shells form a symmetrical double-chamber structure. Dynamic flow balance is achieved through a control valve and circulation pipe, keeping pressure fluctuations within ±2% and avoiding water hammer effects. This device, through systematic design, overcomes the pain points of traditional piston pumps, such as easy seal failure and high maintenance frequency, and is particularly suitable for long-cycle continuous operation scenarios.

[0008] In a preferred embodiment, the piston body has a set of inner grooves on the outer side of its lower end for limiting and fitting with the piston ring assembly, and the inner grooves have a set of piston rings for movably sealingly connecting with the inner wall of the piston housing.

[0009] In a preferred embodiment, a piston housing 2 is provided on the outer side of the piston ring assembly 1 for pumping in external fluid, and a piston connecting rod 2 is provided on the right side of the rotating head for driving the piston body 2 to move.

[0010] In a preferred embodiment, the piston connecting rod 2 has a set of piston bodies 2 for pumping out liquid from inside the housing on its right side, and the piston body 2 has a set of inner grooves 2 for limiting and fitting with piston ring assembly 2 on its outer right side.

[0011] As a preferred embodiment, the inner groove 2 is provided with a set of piston rings 2 for movable sealing connection with the inner wall of piston shell 1, and the piston rings 2 are provided with a set of piston shell 1 for pumping out the fluid inside the outer shell. The modular design of piston rings 1 and 2 and the detachable front sealing cover plate supports quick replacement of seals (time ≤ 30 minutes), reducing maintenance costs by 60% compared with traditional welded structures.

[0012] In a preferred embodiment, a set of circulation pipes for circulating fluid between the lower right side of piston housing 1 and the right side of piston housing 2 are provided, and a set of control valves for controlling the flow of fluid inside piston housing 1 are provided at the upper end of the circulation pipes.

[0013] After adopting the above technical solution, the beneficial effects of this utility model are: by using the front sealing cover plate and the outer shell to form a mechanical fitting seal through the embedded groove, combined with the elastic compensation characteristics of the sealing gasket, a double sealing barrier is achieved under high pressure conditions (≥20MPa), and the leakage rate is reduced to below 0.01mL / min.

[0014] The rotating head adopts a V-shaped cross-section design, which, together with the precise guidance of the internal connecting bearing, improves the driving torque transmission efficiency to 95%. At the same time, it disperses the alternating load of piston connecting rods one and two, reduces eccentric wear, and extends the bearing life by 3 times. The piston body one and two and the piston shell one and two form a symmetrical double-chamber structure. The flow dynamic balance is achieved through the control valve and circulation pipe, so that the pressure fluctuation range is controlled within ±2% and the water hammer effect is avoided. The above device overcomes the pain points of traditional piston pumps, such as easy seal failure and high maintenance frequency, through systematic design. It is particularly suitable for long-cycle continuous operation scenarios.

[0015] By using modularly designed piston ring assemblies one and two and a removable front sealing cover, quick seal replacement is supported (time ≤30 minutes), reducing maintenance costs by 60% compared to traditional welded structures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of the structure of a high-stability piston pump sealing device according to the present invention.

[0018] Figure 2 This is a schematic diagram of the front view of the internal structure of the inner cavity in a high-stability piston pump sealing device of this utility model.

[0019] Figure 3 This is a top view of the rotating head and related structures in a high-stability piston pump sealing device according to the present invention.

[0020] In the diagram: 100-Upper connecting bracket, 110-Outer shell, 120-Front sealing cover, 130-Fixing bolt, 140-Power connector, 150-Connecting flange, 160-Piston housing one, 170-Circulation pipe, 180-Control valve, 190-Piston housing two, 200-Inner cavity, 210-Rotating head, 220-Piston connecting rod one, 230-Piston body one, 240-Piston connecting rod two, 250-Piston body two, 260-Piston ring assembly one, 270-Piston ring assembly two. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-3 A highly stable piston pump sealing device includes: an upper connecting bracket 100, a front sealing cover plate 120, and a piston ring assembly 270. The lower end of the upper connecting bracket 100 is provided with a set of outer shells 110 for sealing and protecting the inside of the piston pump. The front side of the outer shells 110 is provided with a set of embedded grooves for sealing and fitting with the outer shells 110.

[0023] The recessed groove is provided with a set of front sealing cover plates 120 for sealing connection therewith. The front sealing cover plate 120 and the recessed groove are provided with a sealing gasket. The sealing gasket provides a sealing fit between the front sealing cover plate 120 and the recessed groove. The front sealing cover plate 120 is provided with a set of power connectors 140 for introducing external power.

[0024] As the first embodiment of this utility model: In actual use, the front sealing cover plate 120 and the outer shell 110 form a mechanical fitting seal through the embedded groove. Combined with the elastic compensation characteristics of the sealing gasket, a double sealing barrier is achieved under high pressure conditions (≥20MPa), and the leakage rate is reduced to below 0.01mL / min, which is better than the API 682 standard. A set of inner connecting bearings for limiting and guiding the power connector 140 and the front sealing cover plate 120 is provided at the through connection. A set of rotating heads 210 for driving the piston connecting rod 220 and the piston connecting rod 240 is provided on the rear side of the power connector 140.

[0025] As a second embodiment of this utility model: Based on the description in the above embodiments, further, the front cross-section of the rotary head 210 is a V-shaped structure. The inner side of the upper left end of the rotary head 210 is provided with a set of piston connecting rods 220 for driving the piston body 230. The lower end of the piston connecting rods 220 is provided with a set of piston bodies 230 for pumping fluid into the piston shell 190. The rotary head 210 adopts a V-shaped cross-section design, which, together with the precise guidance of the inner connecting bearing, improves the driving torque transmission efficiency to 95%, while dispersing the alternating load of piston connecting rods 220 and 2, reducing eccentric wear, and extending the bearing life by 3 times. The piston bodies 230 and 2 and the piston shells 160 and 2 form a symmetrical double-cavity structure. The flow dynamic balance is achieved through the control valve 180 and the circulation pipe 170, so that the pressure fluctuation amplitude is controlled within ±2%, avoiding the water hammer effect. The above device overcomes the pain points of easy seal failure and high maintenance frequency of traditional piston pumps through systematic design, and is particularly suitable for long-cycle continuous operation scenarios.

[0026] The lower outer side of the piston body 230 is provided with a set of inner grooves for limiting and fitting with the piston ring assembly 260. Inside the inner grooves is a set of piston ring assembly 260 for movably sealing and connecting with the inner wall of the piston housing 190.

[0027] A set of piston housings 190 for pumping external fluid is provided on the outer side of piston ring assembly 260, and a set of piston connecting rods 240 for driving piston body 250 is provided on the right side of swivel head 210.

[0028] The piston connecting rod 240 has a set of piston bodies 250 on the right side for pumping out liquid from the inside of the housing 110. The piston body 250 has a set of inner grooves on the outer side of the right end for limiting and fitting with the piston ring assembly 270.

[0029] The inner groove 2 has a set of piston ring 270 for movable sealing connection with the inner wall of piston housing 160. The outer side of piston ring 270 has a set of piston housing 160 for pumping fluid out of the outer shell 110. The modular design of piston ring 260 and 260 and the detachable front sealing cover 120 supports quick replacement of seals (time ≤ 30 minutes), reducing maintenance costs by 60% compared with traditional welded structures.

[0030] A set of circulation pipes 170 is provided on the lower right side of piston housing 160 and the right side of piston housing 2 190 for circulating fluids inside piston housing 160 and piston housing 2 190. A set of control valves 180 is provided at the upper end of circulation pipes 170 for controlling the flow of fluid inside piston housing 160.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A highly stable piston pump sealing device, comprising: The upper connecting bracket (100), the front sealing cover plate (120), and the piston ring assembly 2 (270) are characterized in that: the lower end of the upper connecting bracket (100) is provided with a set of outer shells (110) for sealing and protecting the inside of the piston pump, and the front side of the outer shell (110) is provided with a set of embedded grooves for sealing and fitting with the outer shell (110); The recessed groove is provided with a set of front sealing cover plates (120) for sealing connection therewith. The front sealing cover plate (120) and the recessed groove are provided with a sealing gasket. The sealing gasket provides a sealing fit between the front sealing cover plate (120) and the recessed groove. The front sealing cover plate (120) is provided with a set of power connectors (140) for introducing external power.

2. The high-stability piston pump sealing device according to claim 1, characterized in that: The power connector (140) and the front sealing cover (120) are connected by a set of inner connecting bearings for limiting and guiding them. The rear side of the power connector (140) is provided with a set of rotating heads (210) for driving the piston connecting rod one (220) and piston connecting rod two (240) to move.

3. The high-stability piston pump sealing device according to claim 2, characterized in that: The front cross-section of the swivel head (210) is a V-shaped structure. The upper left inner side of the swivel head (210) is provided with a set of piston connecting rods (220) for driving the piston body (230) to move. The lower end of the piston connecting rod (220) is provided with a set of piston body (230) for pumping fluid into the piston shell (190).

4. The high-stability piston pump sealing device according to claim 3, characterized in that: The piston body (230) has a set of inner grooves on the outer side of its lower end for limiting and fitting with piston ring assembly (260). Inside the inner grooves, there is a set of piston ring assembly (260) for movably sealing and connecting with the inner wall of piston shell (190).

5. The high-stability piston pump sealing device according to claim 4, characterized in that: The piston ring assembly (260) has a piston housing (190) on its outer side for pumping in external fluid, and the rotating head (210) has a piston connecting rod (240) on its right side for driving the piston body (250) to move.

6. The high-stability piston pump sealing device according to claim 5, characterized in that: The piston connecting rod 2 (240) has a set of piston body 2 (250) on the right side for pumping out liquid from the inside of the outer shell (110). The piston body 2 (250) has a set of inner groove 2 on the outer side of the right end for limiting and fitting with piston ring group 2 (270).

7. A high-stability piston pump sealing device according to claim 6, characterized in that: The inner groove 2 is provided with a set of piston ring 2 (270) for movably sealing connection with the inner wall of piston shell 1 (160), and the piston ring 2 (270) is provided with a set of piston shell 1 (160) for pumping out the fluid inside the outer shell (110).

8. A high-stability piston pump sealing device according to claim 7, characterized in that: A set of circulation pipes (170) for circulating fluids inside piston shell 1 (160) and piston shell 2 (190) is provided on the lower right side of piston shell 1 (160) and the right side of piston shell 2 (190). A set of control valves (180) for controlling the flow of fluid inside piston shell 1 (160) is provided at the upper end of circulation pipes (170).

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