ESC plunger pump with sealing structure

Abstract

An ESC plunger pump with sealing structure, the outer side of the bottom end of the liquid outlet steel column seat is sleeved with a hollow frame, a piston pin is arranged on one side of the hollow frame, one end of the piston pin extends into the hollow frame and is connected, a sealing structure is arranged on the piston pin, the sealing structure includes a star-shaped sealing ring and a check ring, the star-shaped sealing ring is arranged between the hollow frame and the check ring, the check ring abuts against the star-shaped sealing ring, a sealing groove is arranged at the bottom end of the hollow frame, one end of the star-shaped sealing ring extends into the sealing groove, so that the hollow frame and the star-shaped sealing ring are sealingly connected. The design effectively solves the leakage problem caused by poor sealing performance of the traditional plunger pump, especially in harsh working conditions such as high pressure, high speed or high temperature, it can maintain a long-term stable operating state, significantly reduce the risk of energy waste and equipment failure, and improve the production safety.

Description

Technical Field

[0001] This utility model relates to the field of plunger pumps, specifically to an ESC plunger pump with a sealing structure. Background Technology

[0002] As a key component in hydraulic systems, the performance of piston pumps directly affects the efficiency and stability of the entire system. Traditional piston pumps often suffer from leakage problems due to poor sealing performance during long-term operation, resulting in energy waste, potential equipment failure, and compromised production safety. Especially under harsh conditions such as high pressure, high speed, or high temperature, traditional sealing structures often fail to meet the requirements for long-term stable operation, and frequent maintenance and replacement increase operating costs. Furthermore, traditional piston pumps also suffer from problems such as the retaining ring being prone to deformation and damage during press-fitting, and the piston head's sealing components being easily damaged due to prolonged compression and movement against the spring. Summary of the Invention

[0003] In view of this, the present invention provides an ESC plunger pump with a sealing structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution: An ESC plunger pump with a sealing structure includes a pump body, which is composed of a pump cover and an outlet steel ball seat. The pump cover is disposed on one side of the outlet steel ball seat. A hollow frame is fitted on the outer side of the bottom end of the outlet steel ball seat. A piston pin is disposed on one side of the hollow frame. One end of the piston pin extends into the hollow frame for connection. A sealing structure is disposed on the piston pin. The sealing structure includes a star-shaped sealing ring and a retaining ring. The star-shaped sealing ring is disposed between the hollow frame and the retaining ring. The retaining ring abuts against the star-shaped sealing ring. A sealing groove is disposed at the bottom end of the hollow frame. One end of the star-shaped sealing ring extends into the sealing groove to achieve a sealing connection between the hollow frame and the star-shaped sealing ring.

[0005] Preferably, the star-shaped sealing ring includes a star-shaped sealing ring body, the star-shaped sealing ring body is hollow, the star-shaped sealing ring body has a sealing part and a connecting part, the connecting part protrudes towards the hollow frame, the connecting part extends into the sealing groove and connects with the hollow frame, the sealing part is formed on the inner wall of the star-shaped sealing ring, the piston pin passes through the star-shaped sealing ring and connects with the hollow frame, and the sealing part is sealed to the outer wall of the piston pin.

[0006] Preferably, an adjustment chamber is formed within the liquid outlet steel ball seat. A plunger head and a piston rod spring are disposed within the adjustment chamber. The plunger head is movably disposed within the adjustment chamber. The two ends of the piston rod spring abut against the inner wall of the adjustment chamber and the plunger head, respectively. A steel ball groove is also provided on the side of the adjustment chamber near the pump cover. Steel balls are disposed in the steel ball groove. One end of the plunger head moves along the height direction of the adjustment chamber and abuts against the steel balls.

[0007] Preferably, the plunger head includes a plunger head body, a lip seal, and a boss. The lip seal is in sealing contact with the inner wall of the adjustment chamber. The boss is disposed between the lip seal and the body. The piston rod spring is in contact with the boss. The body moves toward the ball groove and abuts against the ball.

[0008] Preferably, the main body also has an oil passage groove, which connects the adjustment cavity to the outside.

[0009] Preferably, a liquid inlet steel ball seat is provided between the piston pin and the plunger head, with one end of the liquid inlet steel ball seat abutting against the plunger head and the other end abutting against the piston pin.

[0010] Preferably, a bushing is also fitted over the piston pin. The bushing has a sealing sleeve portion and a stepped portion. The stepped portion is disposed between the sealing sleeve portion and the retaining ring, and the stepped portion is higher than the sealing sleeve portion.

[0011] Preferably, the thickness of the lip seal is 0.18 mm.

[0012] The beneficial effects of this utility model are as follows: This design effectively solves the leakage problem caused by the poor sealing performance of traditional plunger pumps by setting a sealing structure. Especially under harsh working conditions such as high pressure, high speed, or high temperature, it can maintain a long-term stable operating state, significantly reducing energy waste and the risk of equipment failure, and improving production safety. At the same time, the combination of the star-shaped sealing ring and the retaining ring in this design, as well as the lip-shaped sealing part design on the plunger head, not only enhance the sealing effect but also reduce damage to the plunger head sealing part, extend the service life of the equipment, and reduce maintenance and replacement costs. In addition, the stepped part of the bushing makes the retaining ring more stable during the press-fitting process, less prone to deformation and damage, further improving the reliability and durability of the equipment. Attached Figure Description

[0013] 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.

[0014] Appendix Figure 1 This is a structural schematic diagram of the present invention; Appendix Figure 2 This is a schematic diagram of the hollow frame structure in this utility model; Appendix Figure 3 This is a schematic diagram of the star-shaped sealing ring in this utility model; Appendix Figure 4 This is a schematic diagram of the structure of the plunger head in this utility model.

[0015] Figure label: 1. Pump body; 2. Pump cover; 3. Outlet ball seat; 4. Hollow frame; 5. Piston pin; 6. Sealing structure; 7. Star-shaped seal ring; 8. Retaining ring; 9. Sealing groove; 10. Seal ring body; 11. Sealing part; 12. Connecting part; 13. Adjusting chamber; 14. Plunger head; 15. Piston rod spring; 16. Ball groove; 17. Ball; 18. Plunger head body; 19. Lip seal; 20. Boss; 21. Oil groove; 22. Inlet ball seat; 23. Shaft sleeve; 24. Sealing sleeve; 25. Stepped part. Detailed Implementation

[0016] 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.

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] This utility model provides the following technical solution: As attached Figure 1-4 As shown, this utility model discloses an ESC plunger pump with a sealing structure. The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] This utility model provides the following technical solution: As attached Figure 1-4As shown, this utility model discloses an ESC plunger pump with a sealing structure, including a pump body 1. The pump body 1 consists of a pump cover 2 and a liquid outlet ball seat 3. The pump cover 2 is disposed on one side of the liquid outlet ball seat 3. A hollow frame 4 is sleeved on the outer side of the bottom end of the liquid outlet ball seat 3. A piston pin 5 is disposed on one side of the hollow frame 4. One end of the piston pin 5 extends into the hollow frame 4 for connection. A sealing structure 6 is disposed on the piston pin 5. The sealing structure 6 includes a star-shaped sealing ring 7 and a retaining ring 8. The retaining ring 8 is disposed on the side of the star-shaped sealing ring 7 away from the hollow frame 4. A sealing groove 9 is disposed at the bottom end of the hollow frame 4. One end of the star-shaped sealing ring 7 extends into the sealing groove 9, so that the hollow frame 4 and the star-shaped sealing ring 7 are sealed together. In this embodiment, the function of the sealing structure 6 is to prevent liquid leakage at the connection between the piston pin 5 and the hollow frame 4, ensuring that the ESC plunger pump has good sealing performance during operation. The star-shaped seal 7 and the retaining ring 8 cooperate with each other. The star-shaped seal 7, through its unique star-shaped structure and sealing part 11, fits tightly against the outer wall of the piston pin 5 to form a reliable seal. The retaining ring 8, on the other hand, serves to assist in sealing and protect the star-shaped seal 7, further enhancing the sealing effect and preventing seal failure due to pressure changes or long-term use. This ensures that the ESC plunger pump can operate stably and efficiently, reducing malfunctions and losses caused by leakage, and improving the service life and reliability of the entire equipment. In this embodiment, the pump cover 2 is provided with an oil outlet. The liquid flows to the pump cover 2 via the outlet steel ball seat 3 and then flows out from the pump cover 2.

[0021] Furthermore, the star-shaped sealing ring 7 includes a star-shaped sealing ring body 10, which has a hollow structure. The star-shaped sealing ring body 10 has a sealing portion 11 and a connecting portion 12. The connecting portion 12 protrudes towards the hollow frame 4 and extends into the sealing groove 9 to connect with the hollow frame 4. The sealing portion 11 is formed on the inner wall of the star-shaped sealing ring 7. The piston pin 5 passes through the star-shaped sealing ring 7 and connects with the hollow frame 4. The sealing portion 11 is sealed to the outer wall of the piston pin 5. In this embodiment, the function of the star-shaped sealing ring 7 is to effectively prevent liquid leakage from the connection between the piston pin 5 and the hollow frame 4 through the tight fit between its sealing portion 11 and the outer wall of the piston pin 5. The hollow structure of the star-shaped sealing ring body 10 not only facilitates installation but also allows it to better adapt to the movement of the piston pin 5 through its elastic deformation, ensuring stable sealing performance. Meanwhile, the cooperation between the connecting part 12 and the sealing groove 9 further enhances the reliability of the seal, enabling the entire sealing structure 6 to maintain a good sealing effect even under high pressure, high speed, or frequent start-stop operating environments. Simultaneously, the retaining ring 8 abuts against the star-shaped sealing ring 7, making the sealing effect of the star-shaped sealing ring 7 more significant. The retaining ring 8 can withstand a certain pressure, preventing the star-shaped sealing ring 7 from excessive deformation or displacement under high pressure, thereby maintaining a tight fit between the sealing part 11 and the outer wall of the piston pin 5.

[0022] Furthermore, an adjustment cavity 13 is formed within the outlet steel ball seat 3. A plunger head 14 and a piston rod spring 15 are disposed within the adjustment cavity 13. The plunger head 14 is movably disposed within the adjustment cavity 13. The two ends of the piston rod spring 15 respectively abut against the inner wall of the adjustment cavity 13 and the plunger head 14. A steel ball groove 16 is also provided on the side of the adjustment cavity 13 near the pump cover 2. Steel balls 17 are disposed within the steel ball groove 16. One end of the plunger head 14 moves along the height direction of the adjustment cavity 13 and abuts against the steel ball 17. In this embodiment, the function of the outlet steel ball seat 3 is to achieve precise control and adjustment of the ESC plunger pump's outlet process through the adjustment cavity 13 formed within it and the disposed plunger head 14, piston rod spring 15, and steel balls 17. The regulating chamber 13 provides space for the movement of the plunger head 14. Under the action of the piston rod spring 15 and the piston pin 5, the plunger head 14 can reciprocate along the height direction of the regulating chamber 13, thereby changing the contact state with the steel ball 17 and thus controlling the flow rate and pressure of the liquid. This design allows the ESC plunger pump to flexibly adjust the liquid output parameters according to actual needs, meeting the usage requirements of different working scenarios. At the same time, the steel ball groove 16 and the steel ball 17 assist the regulating chamber 13 in regulation. When the plunger head 14 moves towards the steel ball groove 16 and lifts the steel ball 17, the liquid can flow smoothly from the regulating chamber 13 to the pump cover 2. When the plunger head 14 moves in the opposite direction, the steel ball presses tightly against the steel ball groove 16 due to the difference in internal and external pressure, preventing the liquid from flowing back. At the same time, the external liquid is squeezed into the regulating chamber 13 by pressure. This design cleverly utilizes the movement characteristics of the steel ball 17 under different pressure states to achieve effective control of the liquid flow direction and flow rate. In addition, the presence of the piston rod spring 15 not only provides restoring force for the reciprocating motion of the plunger head 14, but also plays a buffering and stabilizing role in the liquid discharge process through its elastic characteristics, so that the ESC plunger pump can maintain a relatively stable pressure and flow rate when discharging liquid, reducing the failures and problems that may be caused by pressure fluctuations.

[0023] Furthermore, the plunger head 14 includes a plunger head body 18, a lip seal 19, and a boss 20. The lip seal 19 is in sealing contact with the inner wall of the regulating cavity 13. The boss 20 is disposed between the lip seal 19 and the body. The piston rod spring 15 is in contact with the boss 20. The body moves toward the ball groove 16 and abuts against the ball 17. In this embodiment, the plunger head 14 functions to achieve precise control of the liquid flow in the regulating cavity 13 through the coordinated work of its body, lip seal 19, and boss 20. The tight fit between the lip seal 19 and the inner wall of the regulating cavity 13 effectively prevents liquid leakage during the movement of the plunger head 14, ensuring the stability of the liquid output. The boss portion 20, serving as the contact point of the piston rod spring 15, not only transmits the spring force but also enhances the structural strength of the plunger head 14 through its structural design. This allows it to withstand greater pressure and frequent movement without easily being damaged, and also ensures that the lip seal portion 19 will not contact the piston rod spring 15 and cause damage. The body portion, by moving towards the ball groove 16 and abutting against the ball 17, achieves direct control of the liquid flow rate. This design gives the ESC plunger pump greater flexibility and accuracy during liquid discharge. In this embodiment, the ball groove 16 is arranged in an hourglass shape, through which the liquid communicates with the external environment and the regulating chamber 13. The steel column 17 is positioned within the steel column groove 16, abutting against the steel ball groove 16. When the plunger head 14 abuts against the steel ball 17, the liquid in the regulating chamber 13 can flow out through the steel ball groove 16. When the plunger head 14 moves away from the steel column 17, the steel ball 17 is subjected to internal low pressure and tightly adheres to one side of the steel ball groove 16, blocking the liquid's return flow from the outside to the regulating chamber 13. At this time, the liquid can only flow into the regulating chamber from the side of the inlet steel ball seat 22 and then flow out through the steel ball groove 16. This hourglass-shaped steel ball groove 16 design further optimizes the flow characteristics of the liquid entering and exiting the regulating chamber 13, reduces the resistance during liquid flow, improves the working efficiency of the ESC plunger pump, and also enhances the stability and reliability of the entire liquid discharge control system, enabling the ESC plunger pump to maintain good liquid discharge performance under different operating conditions.

[0024] Furthermore, an oil passage 21 is provided on the main body. The oil passage 21 connects the regulating chamber 13 to the outside. The presence of the oil passage 21 provides an additional channel for the flow of liquid in the regulating chamber 13. During the movement of the plunger head 14, when the pressure in the regulating chamber 13 changes, the liquid can be balanced and regulated to a certain extent through the oil passage 21. This avoids damage to components such as the plunger head 14 and lip seal 19 that may be caused by pressure concentration or sudden changes, and extends the service life of these key components. At the same time, it makes the ESC plunger pump run more smoothly, reduces noise and vibration caused by pressure fluctuations, and improves the user experience and performance of the entire device.

[0025] Furthermore, the main body also has an oil passage groove 21, which connects the regulating chamber 13 to the outside. In this embodiment, the function of the oil passage groove 21 is to achieve the flow and balance of liquid within the regulating chamber 13 by connecting it to the outside. During the operation of the ESC plunger pump, the oil passage groove 21 allows a small amount of liquid to pass through, thereby effectively mitigating pressure changes within the regulating chamber 13 caused by the movement of the plunger head 14, and preventing seal failure or component damage due to pressure accumulation. At the same time, the design of the oil passage groove 21 also considers the return and replenishment of liquid, ensuring sufficient and stable liquid within the regulating chamber 13, further improving the working efficiency and reliability of the ESC plunger pump.

[0026] Furthermore, a liquid inlet ball seat 22 is provided between the piston pin 5 and the plunger head 14. One end of the liquid inlet ball seat 22 abuts against the plunger head 14, and the other end abuts against the piston pin 5. In this embodiment, the function of the liquid inlet ball seat 22 is to connect and transition between the piston pin 5 and the plunger head 14, ensuring smooth and stable liquid inlet. The tight contact of one end of the liquid inlet ball seat 22 with the plunger head 14 accurately transmits the movement and force of the plunger head 14, coordinating the liquid inlet process with the movement of the plunger head 14; the other end abutting against the piston pin 5 ensures the stability and reliability of the liquid inlet ball seat 22 itself, avoiding problems such as poor liquid inlet or leakage due to loosening or displacement. Simultaneously, the design of the liquid inlet ball seat 22 also considers the flow characteristics and pressure distribution of the liquid. Through its reasonable shape and size, it effectively guides the liquid into the regulating chamber 13, reducing resistance loss and eddy current generation during the liquid inlet process, improving liquid inlet efficiency and the overall performance of the pump. In addition, the inlet ball seat 22 also adopts certain sealing measures to prevent liquid from leaking from the gap between the piston pin 5 and the plunger head 14 during the liquid inlet process, which further enhances the sealing performance and reliability of the ESC plunger pump.

[0027] Furthermore, a bushing 23 is fitted over the piston pin 5. The bushing 23 has a sealing sleeve portion 24 and a stepped portion 25. The stepped portion 25 is disposed between the sealing sleeve portion 24 and the retaining ring 8, and is higher than the sealing sleeve portion 24. In this embodiment, the bushing 23 provides additional sealing protection and support for the piston pin 5 through the structural design of its sealing sleeve portion 24 and stepped portion 25. The sealing sleeve portion 24 is tightly fitted over the piston pin 5, effectively preventing liquid leakage from the gap between the piston pin 5 and surrounding components, thus enhancing the overall sealing performance. The stepped portion 25 is higher than the sealing sleeve portion 24 and is disposed between the sealing sleeve portion 24 and the retaining ring 8. It not only positions and fixes the bushing 23 but also, to a certain extent, prevents the entry of external impurities and dirt, protecting the piston pin 5 and the sealing structure 6 from dirt and grime. Meanwhile, the material and manufacturing process of the bushing 23 have been carefully selected and optimized to ensure that it has good wear resistance, corrosion resistance and elasticity, and can maintain stable sealing effect and support performance during long-term use, thereby further improving the reliability and service life of the ESC plunger pump. The bushing 23 also provides some protection for the retaining ring 8 during the press-fitting process, preventing deformation and damage to the retaining ring 8.

[0028] Furthermore, the thickness of the lip seal 19 is 0.18 mm. In this embodiment, the thickness of the lip seal 19 has been carefully designed and optimized. This thickness ensures sealing performance while also taking into account the flexibility and durability of the seal 11. The 0.18 mm thickness ensures effective sealing contact between the lip seal 19 and the inner wall of the regulating cavity 13, preventing liquid leakage, while also maintaining sufficient elasticity during the movement of the plunger head 14 to accommodate minor deformations and unevenness of the inner wall of the regulating cavity 13, thereby ensuring a long-lasting and stable sealing effect.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ESC plunger pump with a sealed structure, comprising a pump body, the pump body being composed of a pump cover and an outlet ball seat, the pump cover being disposed on one side of the outlet ball seat, a perforated frame being sleeved on the outer side of the bottom end of the outlet ball seat, a piston pin being disposed on one side of the perforated frame, one end of the piston pin extending into the perforated frame for connection, characterized in that: The piston pin is provided with a sealing structure, which includes a star-shaped sealing ring and a retaining ring. The star-shaped sealing ring is disposed between the hollow frame and the retaining ring, and the retaining ring abuts against the star-shaped sealing ring. A sealing groove is provided at the bottom end of the hollow frame, and one end of the star-shaped sealing ring extends into the sealing groove so that the hollow frame and the star-shaped sealing ring are sealed together.

2. The ESC plunger pump with a sealing structure according to claim 1, characterized in that: The star-shaped sealing ring includes a star-shaped sealing ring body, which has a hollow structure. The star-shaped sealing ring body has a sealing part and a connecting part. The connecting part protrudes towards the hollow frame and extends into the sealing groove to connect with the hollow frame. The sealing part is formed on the inner wall of the star-shaped sealing ring. The piston pin passes through the star-shaped sealing ring and connects with the hollow frame. The sealing part is sealed to the outer wall of the piston pin.

3. The ESC plunger pump with a sealing structure according to claim 1, characterized in that: An adjustment chamber is formed inside the liquid outlet steel ball seat. A plunger head and a piston rod spring are installed in the adjustment chamber. The plunger head is movably installed in the adjustment chamber. The two ends of the piston rod spring abut against the inner wall of the adjustment chamber and the plunger head, respectively. A steel ball groove is also provided on the side of the adjustment chamber near the pump cover. Steel balls are placed in the steel ball groove. One end of the plunger head moves along the height direction of the adjustment chamber and abuts against the steel balls.

4. An ESC plunger pump with a sealing structure according to claim 3, characterized in that: The plunger head includes a plunger head body, a lip seal, and a boss. The lip seal is in sealing contact with the inner wall of the adjustment chamber. The boss is located between the lip seal and the body. The piston rod spring is connected to the boss. The body moves toward the ball groove and abuts against the ball.

5. An ESC plunger pump with a sealing structure according to claim 4, characterized in that: The main body is also provided with an oil passage groove, which connects the adjustment cavity to the outside.

6. An ESC plunger pump with a sealing structure according to claim 3, characterized in that: A liquid inlet steel ball seat is also provided between the piston pin and the plunger head. One end of the liquid inlet steel ball seat abuts against the plunger head, and the other end abuts against the piston pin.

7. An ESC plunger pump with a sealing structure according to claim 1, characterized in that: A bushing is also fitted over the piston pin. The bushing has a sealing sleeve portion and a stepped portion. The stepped portion is located between the sealing sleeve portion and the retaining ring, and the stepped portion is higher than the sealing sleeve portion.

8. An ESC plunger pump with a sealing structure according to claim 4, characterized in that: The thickness of the lip seal is 0.18 mm.

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