A three-cylinder pump

Abstract

This utility model provides a three-cylinder pump, including a pump body, a piston, and a piston drive mechanism. The piston drive mechanism includes a drive shaft, an eccentric sleeve, an inner core of the eccentric sleeve, and a bearing. The inner core of the eccentric sleeve is a solid cylindrical structure. The drive shaft is fixed at an eccentric position on the inner core of the eccentric sleeve, and the drive shaft and the inner core of the eccentric sleeve are axially parallel. The eccentric sleeve is mounted on the outside of the inner core of the eccentric sleeve via a bearing, and a pin is provided on the outside of the eccentric sleeve. The distal end of the piston is hinged to the pin. The drive shaft drives the piston to perform reciprocating linear motion through the inner core of the eccentric sleeve, the bearing, and the eccentric sleeve. This three-cylinder pump has the advantages of stable and reliable transmission structure and longer service life.

Description

Technical Field

[0001] This utility model relates to the field of pump technology, specifically to a three-cylinder pump. Background Technology

[0002] The traditional three-cylinder pump body drive methods are as follows:

[0003] The first type is driven directly by a pneumatic or hydraulic cylinder. This type of pump is mainly used in relatively large equipment because only integrated large equipment is equipped with a stable high-pressure oil or gas source or hydraulic power source. The cost of configuring a high-pressure air source or hydraulic power source separately for small equipment is too high, resulting in a narrow application range for this type of three-cylinder pump.

[0004] The second type is a product driven by an electric motor. The drive end is designed as a crankshaft structure, which uses the crankshaft to drive the piston in the three-cylinder pump to reciprocate. The crankshaft structure drives the piston of the pump body in a contact drive process, which is not stable and is prone to local impact, local jamming and other abnormal phenomena. The drive part needs to be maintained and serviced frequently, otherwise it is easy to be damaged.

[0005] For the second type of three-cylinder pump, structural improvements are needed, especially for the drive section, to ensure it meets the technical requirements for stability and reliability.

[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a three-cylinder pump with a stable and reliable transmission structure and a longer service life.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a three-cylinder pump, including a pump body, a piston and a piston drive mechanism, wherein the piston drive mechanism includes a drive spindle, an eccentric sleeve, an eccentric sleeve inner core and a bearing;

[0009] The eccentric sleeve inner core is a solid cylindrical structure, and the drive spindle is fixed at the eccentric position of the eccentric sleeve inner core. The drive spindle and the eccentric sleeve inner core are arranged parallel to each other axially.

[0010] The eccentric sleeve is mounted on the outside of the inner core of the eccentric sleeve via a bearing, and a pin is provided on the outside of the eccentric sleeve.

[0011] The distal end of the piston rod is hinged to the pin shaft;

[0012] The drive spindle drives the piston to perform reciprocating linear motion through the inner core of the eccentric sleeve, bearings, and the eccentric sleeve.

[0013] Based on the above, the outer end of the drive spindle is provided with a number of protruding key structures along the circumferential direction, and the inner core of the eccentric sleeve is provided with mounting holes with keyways corresponding to the drive spindle.

[0014] Based on the above, the eccentric sleeve is provided with a housing, and the housing is integrated with the outer shell of the pump body.

[0015] Based on the above, the piston includes a pull rod portion and a piston plug portion, and the pump body is provided with a pump chamber, a piston plug guide portion and a movable sealing portion corresponding to the piston. The distal end of the pull rod portion is hinged to the pin shaft, and the proximal end of the pull rod portion is fixed to the piston plug portion.

[0016] The piston portion is movably installed in the piston guide portion, and the movable sealing portion is provided in the near-outer region of the piston guide portion. The inner end of the piston guide portion is in communication with the pump chamber.

[0017] Based on the above, a connecting frame is also provided on the pump body corresponding to the piston. The proximal end of the connecting frame is connected to the shaft piston guide, and the distal end of the connecting frame is connected to the housing.

[0018] Based on the above, a through guide hole is provided in the area where the near end of the box body is connected to the connecting frame, the far end of the pull rod is inserted into the guide hole, and a piston is fitted onto the movable area of ​​the pull rod corresponding to the guide hole.

[0019] Based on the above, the inlet end and outlet end of the pump body are respectively located at the two transverse ends of the pump cavity.

[0020] Based on the above, the fixed support feet of the three-cylinder pump are mounted on the housing.

[0021] This utility model has substantial features and advancements compared to existing technologies. Specifically, compared to traditional crankshaft connection methods, this utility model still adheres to the basic principle of connecting rod drive. However, to ensure drive stability, an eccentric sleeve is used to hinge the piston. The connection between the two is stable and not easily loosened. The eccentric sleeve is driven by a bearing and the inner core of the eccentric sleeve. The bearing itself has good rotational performance, which can significantly reduce rotational resistance. The maintenance and upkeep process is relatively simpler. Ultimately, the stability and reliability of the piston drive structure are significantly improved, and the service life is correspondingly extended. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the three-cylinder pump in this utility model.

[0023] In the diagram: 1. Housing; 2. Eccentric sleeve; 3. Bearing; 4. Eccentric sleeve inner core; 5. Drive spindle; 6. Pin; 7. Tie rod; 8. Piston; 9. Connecting frame; 10. Piston guide; 11. Shaft plug; 12. Movable seal; 13. Connecting gasket; 14. Pump body; 15. Pump chamber; 16. Feed end; 17. Discharge end. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0025] like Figure 1 As shown, a three-cylinder pump includes a pump body, a piston, and a piston drive mechanism. The piston drive mechanism includes a drive spindle 5, an eccentric sleeve 2, an eccentric sleeve inner core 4, and a bearing 3.

[0026] The eccentric sleeve inner core 4 is a solid cylindrical structure. The drive spindle 5 is fixed at the eccentric position of the eccentric sleeve inner core 4. The drive spindle 5 and the eccentric sleeve inner core 4 are arranged parallel to each other axially. Specifically, in this embodiment, the outer end of the drive spindle 5 is provided with several protruding key structures along the circumferential direction. The eccentric sleeve inner core 4 is provided with mounting holes with keyways corresponding to the drive spindle 5 to achieve a stable connection in the rotation direction.

[0027] The eccentric sleeve 2 is mounted on the outside of the inner core 4 of the eccentric sleeve via a bearing 3. A pin 6 is provided on the outside of the eccentric sleeve 2. The rotational stability inherent in the bearing 3 is used to solve the rotational fit problem between the eccentric sleeve 2 and the inner core 4 of the eccentric sleeve, so that it has rotational stability, reduces rotational resistance, and has low maintenance cost and relatively simple maintenance method. It is a key structure to replace the traditional crankshaft structure.

[0028] The distal end of the piston rod is hinged to the pin 6. The drive spindle 5 drives the piston rod to perform reciprocating linear motion through the eccentric sleeve inner core 4, bearing 3 and eccentric sleeve 2, thereby achieving stable drive of the three-cylinder pump.

[0029] Furthermore, in this embodiment, in order to protect the safe operation of the piston drive mechanism, a housing 1 is provided on the outside of the eccentric sleeve 2, and the housing 1 is integrated with the outer shell of the pump body 14 to form an integral structure.

[0030] To ensure the stroke length and structural stability of the three-cylinder pump, the piston includes a pull rod portion 7 and a shaft plug portion 11. The pump body is provided with a pump chamber 15, a shaft plug guide portion 10 and a movable sealing portion 12 corresponding to the piston. The distal end of the pull rod portion 7 is hinged to the pin 6, and the proximal end of the pull rod portion 7 is fixed to the shaft plug portion 11.

[0031] The piston part 11 is movably installed in the piston guide part 10. The movable sealing part 12 is provided in the near-outer region of the piston guide part 10. The inner end of the piston guide part 10 is in communication with the pump chamber 15. Through the reciprocating motion of the piston part 11, the feed end 16 and the discharge end 17 of the pump body 14 are respectively provided at the two transverse ends of the pump chamber 15, so that the pressure in the pump chamber 15 changes intermittently, thereby completing the feed and discharge flow drive of the three-cylinder pump.

[0032] Furthermore, a connecting frame 9 is provided on the pump body 14 corresponding to the piston rod. The near end of the connecting frame 9 is connected to the shaft piston guide part 10, and a connecting sealing gasket 13 is provided at the connection. The far end of the connecting frame 9 is connected to the housing 1 to form an integral structure, so that the center of gravity of the entire three-chamber pump is moved to the rear. In this embodiment, the fixed support of the three-cylinder pump is set on the housing.

[0033] Furthermore, a through guide hole is provided in the area where the near end of the housing 1 is connected to the connecting frame 9, and the far end of the pull rod passes through the guide hole. A piston 8 is fitted on the movable area of ​​the pull rod corresponding to the guide hole. This is because the pull rod 7 is relatively long and is designed to ensure the straightness of the pull rod 7.

[0034] The feed end and discharge end of the pump body are respectively located at the two transverse ends of the pump cavity.

[0035] Working principle:

[0036] The basic working principle of a three-cylinder pump is to use the reciprocating motion of the piston to change the volume of the pump chamber, so that the pressure inside the pump chamber changes at a fixed frequency. Then, with the reciprocating motion of the piston, material is drawn from the feed end and pumped out from the discharge end. It is usually used to pump fluid materials.

[0037] At the drive end of the piston rod, the main shaft is driven to rotate by an external motor, which in turn drives the inner core of the eccentric sleeve to rotate eccentrically. The eccentric sleeve 2 and the inner core of the eccentric sleeve 4 are connected together by a bearing 3, and then connected to the piston rod by a pin 6, thus realizing the conversion of rotational motion into linear motion.

[0038] Due to the inherent rotational stability of the bearing, the drive end structure of the piston becomes more stable and reliable. Furthermore, the maintenance process mainly involves maintaining the bearing, which is simple, efficient, and relatively inexpensive.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A three-cylinder pump, comprising a pump body, a piston, and a piston drive mechanism, characterized in that: The piston drive mechanism includes a drive spindle, an eccentric sleeve, an eccentric sleeve inner core, and a bearing; The eccentric sleeve inner core is a solid cylindrical structure, and the drive spindle is fixed at the eccentric position of the eccentric sleeve inner core. The drive spindle and the eccentric sleeve inner core are arranged parallel to each other axially. The eccentric sleeve is mounted on the outside of the inner core of the eccentric sleeve via a bearing, and a pin is provided on the outside of the eccentric sleeve. The distal end of the piston rod is hinged to the pin shaft; The drive spindle drives the piston to perform reciprocating linear motion through the inner core of the eccentric sleeve, bearings, and the eccentric sleeve.

2. The three-cylinder pump according to claim 1, characterized in that: The outer end of the drive spindle is provided with several protruding key structures along the circumferential direction, and the inner core of the eccentric sleeve is provided with mounting holes with keyways corresponding to the drive spindle.

3. The three-cylinder pump according to claim 1, characterized in that: The eccentric sleeve is provided with a housing, which is integrated with the outer shell of the pump body.

4. The three-cylinder pump according to claim 3, characterized in that: The piston rod includes a pull rod portion and a piston plug portion. The pump body is provided with a pump chamber, a piston plug guide portion and a movable sealing portion corresponding to the piston rod. The distal end of the pull rod portion is hinged to the pin shaft, and the proximal end of the pull rod portion is fixed to the piston plug portion. The piston portion is movably installed in the piston guide portion, and the movable sealing portion is provided in the near-outer region of the piston guide portion. The inner end of the piston guide portion is in communication with the pump chamber.

5. The three-cylinder pump according to claim 4, characterized in that: A connecting frame is also provided on the pump body corresponding to the piston rod. The proximal end of the connecting frame is connected to the shaft piston guide, and the distal end of the connecting frame is connected to the housing.

6. The three-cylinder pump according to claim 5, characterized in that: A through guide hole is provided in the area where the near end of the housing is connected to the connecting frame. The far end of the pull rod passes through the guide hole, and a piston is fitted onto the movable area of ​​the pull rod corresponding to the guide hole.

7. The three-cylinder pump according to claim 4, characterized in that: The feed end and discharge end of the pump body are respectively located at the two transverse ends of the pump cavity.

8. The three-cylinder pump according to claim 6, characterized in that: The fixed support feet of the three-cylinder pump are mounted on the housing.

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