A Y-type connecting rod piston pump

Abstract

The present invention discloses a Y-type connecting rod piston pump, comprising a cylinder body, a piston forming a sliding pair with the cylinder body, each set of cylinder body and piston corresponding to a piston rod, a set of connecting rod assembly and a set of eccentric wheel assembly, each set of the connecting rod assembly comprises two connecting rods arranged symmetrically relative to the center line of the cylinder body, each set of the eccentric wheel assembly comprises two eccentric wheels arranged symmetrically relative to the center line of the cylinder body, the two eccentric wheels are driven by a driving assembly to rotate synchronously in the opposite direction, the upper ends of the two connecting rods are respectively connected to the corresponding eccentric wheels, the lower ends of the two connecting rods are respectively connected to the upper ends of the piston rods, and the lower ends of the piston rods are connected to the pistons. The present invention can effectively eliminate the lateral pressure of the piston on the side wall of the cylinder body, achieve the purpose of no lateral pressure and reduce friction loss, and can adapt to the errors of each moving part, so that the entire mechanism will not interfere or get stuck due to processing and assembly errors.

Description

Technical Field

[0001] The invention belongs to the field of pumps, and more specifically, relates to a Y-type connecting rod piston pump. Background Art

[0002] The moving mechanisms of the widely used compressors, pumps and other mechanical equipment are mostly reciprocating motion. Through the traditional crank-connecting rod mechanism, the rotational motion of the prime movers such as rotating motors, steam turbines and internal combustion engines is converted into reciprocating linear motion, driving the piston to reciprocate and causing the volume of the sealed working chamber in the cylinder to change periodically, thereby completing its designed working process.

[0003] The above-mentioned traditional reciprocating power mechanical equipment has a simple structure, but due to the limitations of the structural principle of its transmission mechanism (crank-connecting rod mechanism), it has the following shortcomings: when the crank-connecting rod mechanism converts rotational motion into reciprocating linear motion, the crosshead slider will generate lateral force, which will increase the friction of the mechanism and increase energy consumption. It will also aggravate the wear of sliding mating parts and cylinder seals, shortening the service life of the equipment. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a Y-type connecting rod piston pump, which can effectively eliminate the lateral pressure of the piston on the side wall of the cylinder during operation, thereby achieving the purpose of no lateral pressure and reduced friction loss.

[0005] In order to solve the above technical problems, the present invention provides a Y-type connecting rod piston pump, which includes a cylinder body, a piston forming a sliding pair with the cylinder body, each group of cylinder body and piston corresponds to a piston rod, a set of connecting rod assemblies and a set of eccentric wheel assemblies, each set of the connecting rod assemblies includes two connecting rods symmetrically arranged relative to the center line of the cylinder body, each set of the eccentric wheel assemblies includes two eccentric wheels symmetrically arranged relative to the center line of the cylinder body, the two eccentric wheels are driven by a driving assembly to rotate synchronously in opposite directions, the upper ends of the two connecting rods are respectively rotatably connected to the corresponding eccentric wheels, the lower ends of the two connecting rods are respectively rotatably connected to the upper ends of the piston rods, and the lower end of the piston rod is rotatably connected to the piston.

[0006] As a preferred solution of the present invention, the outer shell of the connecting rod is formed by assembling two symmetrical connecting rod housings; or, the outer shell of the connecting rod is formed by assembling a connecting rod housing and a connecting rod end cover.

[0007] As a preferred solution of the present invention, the upper end of the connecting rod is rotatably connected to the eccentric wheel via a first bearing.

[0008] Preferably, the first bearing is a self-aligning bearing.

[0009] Wherein, a first connecting rod sleeve is provided at the upper end of the connecting rod, the first connecting rod sleeve is fixedly connected to the outer ring of the first bearing, and the inner ring of the first bearing is fixedly connected to the eccentric wheel.

[0010] Furthermore, the upper end of the connecting rod is also provided with an eccentric wheel cover cooperatedly connected with the eccentric wheel, and a connecting rod end cover cooperatedly connected with the first connecting rod sleeve.

[0011] As a preferred solution of the present invention, the lower end of the connecting rod is rotatably connected to the upper end of the piston rod via a second bearing.

[0012] Among them, a second connecting rod sleeve is provided at the lower end of the connecting rod, and the second connecting rod sleeve is fixedly connected to the outer ring of the second bearing. A connecting rod pin housing is provided at the upper end of the piston rod, and a connecting rod shaft pin is fixedly provided on the connecting rod pin housing, and the inner ring of the second bearing is fixedly connected to the connecting rod shaft pin.

[0013] As a preferred solution of the present invention, two symmetrically arranged fixed cover plates are provided at the upper end of the connecting rod pin housing, the two ends of the connecting rod shaft pin are respectively fixed on the fixed cover plates, and the two fixed cover plates respectively cover the side of the second bearing exposed to the connecting rod.

[0014] As a preferred solution of the present invention, the lower end of the connecting rod pin shell is provided with a locking assembly for connecting the piston rod, and the locking assembly includes a chuck and a connecting plate. The connecting plate is installed on the lower end of the connecting rod pin shell so as to be adjustable up and down by screws. The connecting plate is provided with a through hole for the upper end of the piston rod to pass through. The chuck includes a first clip and a second clip. The first clip and the second clip form an inverted cone-shaped sleeve when combined. The chuck is arranged on the through hole. When the connecting plate is adjusted up or down, the through hole pushes the first clip and the second clip to clamp or loosen the piston rod.

[0015] As a preferred solution of the present invention, the lower end of the piston rod is rotatably connected to the piston via a ball bearing.

[0016] In which, the piston includes a piston cover and a piston body, the piston cover and the piston body are matched and connected to form a closed oil chamber, the ball bearing is embedded in the bottom of the oil chamber, the ball bearing includes a joint ball, a ball bearing upper shell and a ball bearing lower shell, the joint ball is arranged in the ball chamber formed by the ball bearing upper shell and the ball bearing lower shell, and is slidably matched with the ball chamber, and the lower end of the piston rod passes through the piston cover and is fixedly connected to the joint ball.

[0017] As a preferred solution of the present invention, a first inlet and outlet oil channel is provided inside the lower end of the piston rod, and a second inlet and outlet oil channel is provided inside the lower end of the joint ball. The upper end of the first inlet and outlet oil channel is connected to the oil chamber, the lower end of the first inlet and outlet oil channel is connected to the upper end of the second inlet and outlet oil channel, and the lower end of the second inlet and outlet oil channel is connected to the fitting clearance between the joint ball and the lower shell of the ball bearing.

[0018] Furthermore, a one-way valve is provided on the first inlet and outlet oil passage or the second inlet and outlet oil passage.

[0019] As a preferred solution of the present invention, a sleeve is fixedly provided on the piston cover for the piston rod to pass through, the lower end surface of the sleeve abuts against the upper end surface of the ball bearing upper shell, and an oil hole connected to the oil chamber is provided on the peripheral wall of the sleeve.

[0020] As a preferred solution of the present invention, the driving assembly includes a motor, a synchronous gear transmission assembly and two driving shafts arranged symmetrically relative to the center line of the cylinder body. The power output end of the motor is connected to the driving shaft through the synchronous gear transmission assembly, and the driving shaft is fixedly connected to the eccentric hole of the eccentric wheel.

[0021] Compared with the prior art, the Y-type connecting rod piston pump of the present invention has the following beneficial effects:

[0022] The structure of the present invention eliminates the traditional crosshead slider structure, and uses a Y-type connecting rod transmission mechanism composed of a piston rod and a connecting rod assembly, utilizing the principle of symmetrical force on the connecting rod to eliminate the lateral pressure of the piston on the side wall of the cylinder body, thereby achieving the purpose of no lateral pressure and reduced friction loss, thereby improving the dynamic performance of the product, reducing energy consumption, and extending the service life of the product; at the same time, since the piston rod and the piston are rotatably connected, they can adapt to the errors of each moving part, so that the entire mechanism will not interfere or get stuck due to processing and assembly errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0024] Figure 1 It is a structural schematic diagram of a Y-type connecting rod piston pump provided by the present invention;

[0025] Figure 2 It is an exploded view of a power output part of a Y-type connecting rod piston pump provided by the present invention;

[0026] Figure 3 It is a cross-sectional view of the connection between the piston rod and the piston;

[0027] Figure 4 It is a structural schematic diagram of another embodiment of a connecting rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0030] like Figures 1 to 4 As shown, a preferred embodiment of a Y-type connecting rod piston pump provided by the present invention comprises a cylinder body 1, a piston 2 which forms a sliding pair with the cylinder body 1, the cylinder body 1 and the piston 2 are provided with 5 groups which are arranged in a straight line, each group of the cylinder body 1 and the piston 2 corresponds to a piston rod 3, a set of connecting rod assembly and a set of eccentric wheel assembly, each set of the connecting rod assembly comprises two connecting rods 4 which are symmetrically arranged with respect to the center line of the cylinder body 1, each set of the eccentric wheel assembly comprises two eccentric wheels 5 which are symmetrically arranged with respect to the center line of the cylinder body 1, the two eccentric wheels 5 are driven by a driving assembly to rotate synchronously in the opposite direction, the upper ends of the two connecting rods 4 are respectively rotatably connected with the corresponding eccentric wheels 5, the lower ends of the two connecting rods 4 are respectively rotatably connected with the upper ends of the piston rod 3, and the lower end of the piston rod 3 is rotatably connected with the piston 2.

[0031] Therefore, the structure of the present invention eliminates the traditional crosshead slider structure, and uses the Y-type connecting rod 4 transmission mechanism composed of the piston rod 3 and the connecting rod assembly, and utilizes the principle of symmetrical force on the connecting rod 4 to eliminate the lateral pressure of the piston 2 on the side wall of the cylinder body 1, thereby achieving the purpose of no lateral pressure and reduced friction loss, thereby improving the power performance of the product, reducing energy consumption, and extending the service life of the product; at the same time, since the piston rod 3 and the piston 2 are rotationally connected, they can adapt to the errors of each moving part, so that the entire mechanism will not interfere or get stuck due to processing and assembly errors.

[0032] For example, to facilitate the installation of the eccentric wheel 5, the outer shell of the connecting rod 4 is formed by assembling two symmetrical connecting rod shells 4a and 4b. Figure 4 Of course, in other embodiments, the outer shell of the connecting rod 4 is formed by a connecting rod housing and a connecting rod end cap 42, such as Figure 2 It should be noted that Figure 3 The connecting rod housing shown can better realize the centering installation of the eccentric wheel 5 and reduce the assembly error.

[0033] Exemplarily, in order to reduce the friction coefficient during the movement of the connecting rod assembly and the eccentric wheel assembly, the upper end of the connecting rod 4 is rotatably connected to the eccentric wheel 5 through the first bearing 6. In specific implementation, the upper end of the connecting rod 4 is provided with a first connecting rod sleeve 41, the first connecting rod sleeve 41 is fixedly connected to the outer ring of the first bearing 6, and the inner ring of the first bearing 6 is fixedly connected to the eccentric wheel 5. Among them, the first bearing 6 is preferably a self-aligning bearing, so that it can withstand both radial loads and a small amount of bidirectional axial loads, effectively preventing the connecting rod 4 from generating axial interference.

[0034] Exemplarily, a sealing ring (not shown in the figure) is provided between the end surface of the first bearing 6 and the first connecting rod sleeve 41 to prevent the lubricating oil from leaking from the rotating part of the bearing and affecting the operation of the bearing. The sealing ring is preferably a lip sealing ring.

[0035] Exemplarily, the upper end of the connecting rod 4 is further provided with an eccentric wheel cover 51 which is cooperatively connected with the eccentric wheel 5 to prevent foreign matter from entering and affecting the operation of the bearing.

[0036] Exemplarily, in order to reduce the friction coefficient during the movement of the connecting rod assembly and the piston rod 3, the lower end of the connecting rod 4 is rotatably connected to the upper end of the piston rod 3 through the second bearing 7. In specific implementation, the lower end of the connecting rod 4 is provided with a second connecting rod sleeve 43, and the second connecting rod sleeve 43 is fixedly connected to the outer ring of the second bearing 7. The upper end of the piston rod 3 is provided with a connecting rod pin housing 44, and a connecting rod shaft pin 45 is fixedly provided on the connecting rod pin housing 44, and the inner ring of the second bearing 7 is fixedly connected to the connecting rod shaft pin 45.

[0037] Exemplarily, two symmetrically arranged fixed cover plates 46 are provided at the upper end of the connecting rod pin housing 44, and the two ends of the connecting rod shaft pin 45 are respectively fixed on the fixed cover plates 46, and the two fixed cover plates 46 respectively cover the side of the second bearing 7 exposed to the connecting rod 4 to prevent the leakage of lubricating oil in the rotating parts and the entry of foreign debris to affect the operation of the bearing.

[0038] Exemplarily, the lower end of the connecting rod pin housing 44 is provided with a locking assembly for connecting the piston rod 3, and the locking assembly includes a chuck 47 and a connecting plate 48. The connecting plate 48 is installed on the lower end of the connecting rod pin housing 44 so as to be adjustable up and down by means of a screw 49. The connecting plate 48 is provided with a through hole for the upper end of the piston rod 3 to pass through. The chuck 47 includes a first clip and a second clip, and the first clip and the second clip cooperate to form an inverted cone-shaped sleeve. The chuck 47 is arranged on the through hole. When the connecting plate 48 is adjusted up or down, the through hole pushes the first clip and the second clip to clamp or loosen the piston rod 3. The structure is simple and the connection is convenient and reliable.

[0039] Exemplarily, in order to make the connection between the piston rod 3 and the piston 2 more flexible and eliminate constraints in multiple directions, the lower end of the piston rod 3 is rotatably connected to the piston 2 through a ball bearing 9. In specific implementation, the piston 2 includes a piston cover 21 and a piston body 22, the piston cover 21 and the piston body 22 are matched and connected to form a closed oil chamber 23, the bottom of the oil chamber 23 is provided with a concave cavity matched with the ball bearing 9, and the ball bearing 9 is embedded in the concave cavity; for easy assembly, the ball bearing 9 includes a joint ball 8, a ball bearing upper shell 91 and a ball bearing lower shell 92, the joint ball 8 is arranged in the ball cavity formed by the ball bearing upper shell 91 and the ball bearing lower shell 92, and is slidably matched with the ball cavity, and the lower end of the piston rod 21 passes through the piston cover 21 and is fixedly connected to the joint ball 8.

[0040] Exemplarily, a first inlet and outlet oil passage 31 is provided inside the lower end of the piston rod 3, a second inlet and outlet oil passage 81 is provided inside the lower end of the joint ball 8 (i.e., inside the end away from the end connected to the piston rod 3), the upper end of the first inlet and outlet oil passage 31 is communicated with the oil chamber 23, the lower end of the first inlet and outlet oil passage 31 is communicated with the upper end of the second inlet and outlet oil passage 81, and the lower end of the second inlet and outlet oil passage 81 is communicated with the fitting clearance between the joint ball 8 and the lower shell 92 of the ball bearing. Thus, the lubricating oil in the oil chamber 23 can enter the fitting clearance between the joint ball 8 and the ball chamber through the first inlet and outlet oil passage 31 and the second inlet and outlet oil passage 81 in sequence, so that a pressure-bearing oil layer is formed on the outer surface of the joint ball 8, which not only ensures the lubrication between the joint ball 8 and the ball chamber, but also avoids direct collision between the joint ball 8 and the ball chamber.

[0041] It should be noted that, during the reciprocating motion of the piston 2, the piston rod 3 will drive the joint ball 8 to repeatedly squeeze the ball bearing upper shell 91 and the ball bearing lower shell 92. In particular, when the piston pump is in a high-pressure discharge state, the piston rod 3 will drive the joint ball 8 to move downward to squeeze the ball bearing lower shell 92. The pressure-bearing oil layer of the joint ball 8 on the side of the ball bearing lower shell 92 will flow back to the oil chamber 23 under the action of high pressure, causing the pressure-bearing oil layer to disappear, thereby causing the joint ball 8 to directly collide with the ball bearing lower shell 92 and cause damage. Therefore, in order to prevent the pressure-bearing oil layer of the joint ball 8 on the side of the ball bearing lower shell 92 from flowing back to the oil chamber 23 under the action of high pressure, a one-way valve 32 is provided on the first inlet and outlet oil channel 31 or the second inlet and outlet oil channel 81.

[0042] Exemplarily, the piston cover 21 is fixed with a sleeve 24 through which the piston rod 3 can pass, and the lower end surface of the sleeve 24 abuts against the upper end surface of the ball bearing upper shell 91 to prevent the piston rod 3 from pulling the joint ball 8 and pulling the ball bearing 9 out of the installation position during the upward movement of the piston 2. In addition, the peripheral wall of the sleeve 24 is provided with an oil hole 25 connected to the oil chamber 23 to ensure that the inlet and outlet oil passages are connected to the oil chamber 23.

[0043] Exemplarily, in order to achieve synchronous reverse operation of the two eccentric wheels 5, the driving assembly includes a motor 10, a synchronous gear transmission assembly 11 and two driving shafts 12 arranged symmetrically relative to the center line of the cylinder body 1, and the power output end of the motor 10 is connected to the driving shaft 12 through the synchronous gear transmission assembly 11, and the driving shaft 12 is fixedly connected to the eccentric hole of the eccentric wheel 5.

[0044] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A Y-type connecting rod piston pump, characterized in that: It includes a cylinder body, a piston forming a sliding pair with the cylinder body, each set of the cylinder body and the piston corresponds to a piston rod, a set of connecting rod assemblies and a set of eccentric wheel assemblies, each set of the connecting rod assemblies includes two connecting rods symmetrically arranged relative to the center line of the cylinder body, each set of the eccentric wheel assemblies includes two eccentric wheels symmetrically arranged relative to the center line of the cylinder body, the two eccentric wheels are driven by a driving assembly to rotate synchronously in the opposite direction, the upper ends of the two connecting rods are respectively rotatably connected to the corresponding eccentric wheels, the lower ends of the two connecting rods are respectively rotatably connected to the upper ends of the piston rods, and the lower end of the piston rod is rotatably connected to the piston; The lower end of the piston rod is rotatably connected to the piston through a ball bearing; the piston includes a piston cover and a piston body, the piston cover and the piston body are matched and connected to form a closed oil chamber, the ball bearing is embedded in the bottom of the oil chamber, the ball bearing includes a joint ball, a ball bearing upper shell and a ball bearing lower shell, the joint ball is arranged in the ball chamber formed by the ball bearing upper shell and the ball bearing lower shell, and is slidably matched with the ball chamber, the lower end of the piston rod passes through the piston cover and is fixedly connected to the joint ball; the lower end of the piston rod is in A first oil inlet and outlet passage is provided in the joint ball, a second oil inlet and outlet passage is provided inside the lower end of the joint ball, the upper end of the first oil inlet and outlet passage is communicated with the oil chamber, the lower end of the first oil inlet and outlet passage is communicated with the upper end of the second oil inlet and outlet passage, the lower end of the second oil inlet and outlet passage is communicated with the fitting clearance between the joint ball and the lower shell of the ball bearing; a sleeve is fixedly provided on the piston cover for the piston rod to pass through, the lower end surface of the sleeve is abutted against the upper end surface of the upper shell of the ball bearing, and an oil hole communicated with the oil chamber is provided on the peripheral wall of the sleeve.

2. The Y-type connecting rod piston pump according to claim 1, characterized in that: The outer shell of the connecting rod is formed by assembling two symmetrical connecting rod housings; or, the outer shell of the connecting rod is formed by assembling a connecting rod housing and a connecting rod end cover.

3. The Y-type connecting rod piston pump according to claim 1, characterized in that: The upper end of the connecting rod is rotatably connected to the eccentric wheel through a first bearing.

4. The Y-type connecting rod piston pump according to claim 3, characterized in that: The first bearing is a self-aligning bearing.

5. The Y-type connecting rod piston pump according to claim 3, characterized in that: A first connecting rod sleeve is provided at the upper end of the connecting rod. The first connecting rod sleeve is fixedly connected to the outer ring of the first bearing, and the inner ring of the first bearing is fixedly connected to the eccentric wheel.

6. The Y-type connecting rod piston pump according to claim 5, characterized in that: The upper end of the connecting rod is also provided with an eccentric wheel cover which is matched and connected with the eccentric wheel.

7. The Y-type connecting rod piston pump according to claim 1, characterized in that: The lower end of the connecting rod is rotatably connected to the upper end of the piston rod through a second bearing.

8. The Y-type connecting rod piston pump according to claim 7, characterized in that: A second connecting rod sleeve is provided at the lower end of the connecting rod, and the second connecting rod sleeve is fixedly connected to the outer ring of the second bearing. A connecting rod pin housing is provided at the upper end of the piston rod, and a connecting rod shaft pin is fixedly provided on the connecting rod pin housing. The inner ring of the second bearing is fixedly connected to the connecting rod shaft pin.

9. The Y-type connecting rod piston pump according to claim 8, characterized in that: Two symmetrically arranged fixed cover plates are provided at the upper end of the connecting rod pin housing, the two ends of the connecting rod shaft pin are respectively fixed on the fixed cover plates, and the two fixed cover plates respectively cover the side of the second bearing exposed to the connecting rod.

10. The Y-type connecting rod piston pump according to claim 8, characterized in that: The lower end of the connecting rod pin shell is provided with a locking assembly for connecting the piston rod, and the locking assembly includes a chuck and a connecting plate. The connecting plate is installed on the lower end of the connecting rod pin shell so as to be adjustable up and down by screws. The connecting plate is provided with a through hole for the upper end of the piston rod to pass through. The chuck includes a first clip and a second clip. The first clip and the second clip form an inverted cone-shaped sleeve after cooperation. The chuck is arranged on the through hole. When the connecting plate is adjusted up or down, the through hole pushes the first clip and the second clip to clamp or loosen the piston rod.

11. The Y-type connecting rod piston pump according to claim 1, characterized in that: A one-way valve is provided on the first inlet and outlet oil passage or the second inlet and outlet oil passage.

12. The Y-type connecting rod piston pump according to any one of claims 1 to 11, characterized in that: The driving assembly includes a motor, a synchronous gear transmission assembly and two driving shafts arranged symmetrically relative to the center line of the cylinder body. The power output end of the motor is connected to the driving shaft through the synchronous gear transmission assembly, and the driving shaft is fixedly connected to the eccentric hole of the eccentric wheel.

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