A linear reciprocating multi-piston pump

Abstract

The invention discloses a linear reciprocating multi-plunger pump, which relates to the technical field of plunger pumps and comprises a base, a driving box is installed in the middle of the base, a double-threaded lead screw and a driving mechanism are respectively installed on the driving box, the driving mechanism controls the rotation of the double-threaded lead screw, nuts are respectively installed on the two threaded ends of the double-threaded lead screw, pump seats are respectively installed at both ends of the base, a moving box connected with the nuts is provided between the pump seat and the driving box, and the moving box is also slidably connected to the base, a pump box is installed on the pump seat, and a plunger mechanism for controlling the pump box is installed on the moving box; through the structural design of the driving mechanism, the plunger rod and the regulating mechanism, the design of the plunger pump is more compact and efficient, and the reciprocating frequency is reduced, which is convenient for realizing standardized combination and system integration between different equipment.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, in particular to a linear reciprocating multi-joint plunger pump. Background Art

[0002] In the current industrial and energy fields, key equipment such as high-power fluid piston high-pressure pumps, high-pressure compressors and generators generally use crankshafts and connecting rod mechanisms to drive pistons to achieve the conversion from rotation to linear reciprocating motion to output high-pressure fluids. At present, this traditional driving method has exposed a series of significant problems in practical applications, as described below:

[0003] First, the stroke limitation problem: The piston stroke of the traditional crankshaft and connecting rod mechanism driven high-pressure pump is often limited by the mechanism design and material strength. This limitation not only limits the output flow and pressure of the pump, but also limits the flexibility of the equipment in a wider range of industrial applications. This limitation is particularly obvious for application scenarios that require higher flow and pressure output.

[0004] Second, movement speed fluctuation and unstable flow: Due to the movement characteristics of the crankshaft and connecting rod mechanism, the movement trajectory of the piston is a sinusoidal waveform, resulting in obvious fluctuations in speed. This speed fluctuation directly affects the output stability of the fluid, making it difficult to maintain a stable flow, which has an adverse effect on the stability and accuracy of the system.

[0005] Third, friction in the cylinder bore and damage to the seal: During the reciprocating motion of the piston, the cylinder bore is subjected to radial force, resulting in increased friction. Long-term friction not only aggravates the wear of the inner bore, but may also cause damage to the seal, thereby reducing the pressure output capacity and volumetric efficiency of the pump and shortening the service life of the equipment.

[0006] Fourth, low mechanical transmission efficiency: Sliding friction in the crankshaft and connecting rod mechanism is one of the main reasons for the reduction of mechanical transmission efficiency. This friction can reduce the mechanical transmission efficiency to about 0.75, which means that a large amount of energy is wasted in the transmission process. For high-power equipment, this energy loss is particularly significant, increasing operating costs and reducing overall energy efficiency.

[0007] Fifth, the problem of low power density and standardized combination of units: Due to the limitations of traditional driving methods, the units perform poorly in terms of power density, making it difficult to achieve efficient and compact design. In addition, it is difficult to achieve standardized combination between different equipment, which increases the difficulty of system integration and maintenance.

[0008] Therefore, it is necessary to provide a linear reciprocating multi-piston pump to solve the problems raised in the above background technology. Summary of the invention

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a linear reciprocating multi-plunger pump, comprising a base, a driving box is installed in the middle of the base, a double-threaded screw and a driving mechanism are respectively installed on the driving box, the driving mechanism controls the rotation of the double-threaded screw, and nuts are respectively installed on the two threaded ends of the double-threaded screw, a pump seat is respectively installed at both ends of the base, a moving box connected to the nut is provided between the pump seat and the driving box, and the moving box is also slidably connected to the base, a pump box is installed on the pump seat, a plunger mechanism for controlling the pump box is installed on the moving box, a plunger cavity and a collecting cavity two connected to the plunger cavity are respectively provided in the pump box, an oil inlet and an oil outlet connected to the collecting cavity two are respectively provided outside the pump box, the plunger mechanism comprises a hydraulic shell installed on the moving box, a plunger rod matching the plunger cavity is installed on the hydraulic shell.

[0010] Furthermore, the pump box is provided with a plurality of axial plunger cavities, and the plurality of plunger cavities are connected with the second manifold chamber.

[0011] Furthermore, the plunger rod includes a plunger barrel arranged in the plunger cavity, the end of the plunger barrel close to the collecting chamber 2 is sleeved with a plug ring tightly attached to the plunger cavity, the barrel cavity of the plunger barrel is equipped with a plug, the plug and the end of the plunger barrel away from the collecting chamber 2 are connected through a sensing spring, and the plug and the barrel cavity of the plunger barrel form a regulating cavity, and a regulating mechanism for regulating the regulating cavity is also installed on the hydraulic shell.

[0012] Furthermore, the hydraulic shell is provided with a collecting chamber 1 for communicating with the regulating chamber, the hydraulic shell is also provided with a hydraulic chamber connected with the collecting chamber 1, a plug plate is installed in the hydraulic chamber, and a hydraulic rod for regulating the movement of the plug plate in the hydraulic chamber is also installed on the hydraulic shell. The hydraulic shell is also connected to a collecting plate on one side close to the pump box, and the collecting plate is used to connect the end of the plunger cylinder away from the collecting chamber 2.

[0013] Furthermore, a flow control valve for regulating the flow of fluid between the manifold chamber 1 and the regulating chamber is installed on the hydraulic housing.

[0014] Furthermore, the sensing spring can monitor the change in axial length of the regulating cavity.

[0015] Furthermore, a limit block for axially limiting the sliding of the plunger is also provided in the plunger cylinder.

[0016] Furthermore, a ball bearing is installed at the lower end of the moving box, and a rolling track connected to the ball bearing is provided on the base.

[0017] Furthermore, the driving mechanism includes a planetary carrier and a connecting ring 2, the planetary carrier is rotatably mounted on the driving box, the planetary carrier is coaxially fixedly connected to the double-threaded screw, a planetary gear is rotatably mounted on the planetary carrier, and a connecting ring 1 is also rotatably mounted on the planetary carrier, the inner ring wall of the connecting ring 1 is fixed with a gear ring meshing with the planetary gear, the outer ring wall of the connecting ring 1 is fixed with a gear ring, the connecting ring 2 is coaxially rotatably connected to the double-threaded screw, one end of the connecting ring 2 is fixed with a sun gear meshing with the planetary gear, and the other end of the connecting ring 2 is fixed with a gear 1, and a motor 1 and a motor 2 are respectively mounted on the driving box, the output end of the motor 1 is mounted with a gear 2 meshing with the gear 1, and the output end of the motor 2 is mounted with a gear 3 meshing with the gear ring.

[0018] Compared with the prior art, the present invention provides a linear reciprocating multi-piston pump, which has the following beneficial effects:

[0019] In the present invention, the structural design of the driving mechanism, the plunger rod and the regulating mechanism makes the stroke of the plunger unrestricted and can be flexibly adjusted according to actual needs, thereby achieving higher flow and pressure output, making the movement speed of the plunger more stable, helping to achieve stable output of flow, reducing the radial force of the cylinder hole, reducing friction and wear, helping to extend the service life of the equipment and improve the sealing performance, reducing the sliding friction effect, significantly improving the mechanical transmission efficiency, reducing energy loss, making the design of the plunger pump more compact and efficient, and reducing the reciprocating frequency, which is convenient for realizing standardized combination and system integration between different equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a linear reciprocating multi-plunger pump;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of a linear reciprocating multi-plunger pump;

[0022] Figure 3 It is a structural schematic diagram of a plunger mechanism in a linear reciprocating multi-plunger pump;

[0023] Figure 4 It is a structural schematic diagram of a driving mechanism in a linear reciprocating multi-piston pump;

[0024] Figure 5 It is a schematic diagram of the structure of a ball in a linear reciprocating multi-piston pump;

[0025] In the figure: 1, base; 2, drive box; 3, double threaded screw; 4, drive mechanism; 5, nut; 6, moving box; 7, pump seat; 8, plunger mechanism; 9, pump box; 11, raceway; 41, planet carrier; 42, planetary gear; 43, sun gear; 44, gear ring; 45, gear ring; 46, connecting ring 1; 47, connecting ring 2; 48, gear 1; 49, motor 1; 410, gear 2; 411, motor 2; 412, gear 3; 6 1. Ball; 81. Hydraulic housing; 82. Plunger rod; 83. Control mechanism; 811. Manifold chamber 1; 812. Hydraulic chamber; 831. Hydraulic rod; 832. Plug plate; 833. Flow control valve; 834. Collecting plate; 821. Plunger cylinder; 822. Plug; 823. Sensing spring; 824. Limit block; 825. Plug ring; 8211. Control chamber; 91. Manifold chamber 2; 92. Plunger chamber; 93. Oil inlet; 94. Oil outlet. DETAILED DESCRIPTION

[0026] Reference Figure 1-Figure 5 The present invention provides a technical solution: a linear reciprocating multi-joint plunger pump, comprising a base 1, a driving box 2 is installed in the middle of the base 1, a double-threaded screw 3 and a driving mechanism 4 are respectively installed on the driving box 2, the driving mechanism 4 controls the rotation of the double-threaded screw 3, nuts 5 are respectively installed on the two threaded ends of the double-threaded screw 3, pump seats 7 are respectively installed at both ends of the base 1, a moving box 6 connected to the nut 5 is provided between the pump seat 7 and the driving box 2, and the moving box 6 is also slidably connected to the base 1, a pump box 9 is installed on the pump seat 7, a plunger mechanism 8 for controlling the pump box 9 is installed on the moving box 6, a plunger cavity 92 and a manifold chamber 91 connected to the plunger cavity 92 are respectively provided in the pump box 9, an oil inlet 93 and an oil outlet 94 connected to the manifold chamber 91 are respectively provided outside the pump box 9, and the plunger mechanism 8 includes a hydraulic shell 81 installed on the moving box 6, and a plunger rod 82 matching the plunger cavity 92 is installed on the hydraulic shell 81.

[0027] In this embodiment, the pump box 9 is configured with multiple axial plunger cavities 92, and the multiple plunger cavities 92 are connected to the collecting chamber 2 91; that is, by setting up multiple axial plunger cavities 92, each plunger cavity 92 can be coordinated and regulated with the plunger rod 82, as well as the regulation of the regulating mechanism 83, so that the oil intake and output can be regulated more flexibly, accurately and timely.

[0028] In this embodiment, the plunger rod 82 includes a plunger barrel 821 disposed in the plunger cavity 92, and the end of the plunger barrel 821 close to the manifold chamber 91 is sleeved with a plug ring 825 that is tightly attached to the plunger cavity 92. The barrel cavity of the plunger barrel 821 is equipped with a plug column 822, and the plug column 822 is connected to the end of the plunger barrel 821 away from the manifold chamber 91 through a sensor spring 823, and the plug column 822 and the barrel cavity of the plunger barrel 821 form a regulating cavity 8211, and the hydraulic housing 81 is also equipped with a regulating mechanism 83 for regulating the regulating cavity 8211; that is, for the amount of oil inlet and oil outlet, There are two ways to change the quantity. First, the volume of the regulating chamber 8211 can be changed to change the volume of the cylinder cavity connecting the plunger cylinder 821 and the collecting chamber 2 91. Second, the displacement of the nut can be changed by the driving mechanism 4. Third, since there is deceleration and acceleration at the moment of reciprocating movement, the efficiency of oil intake and oil output is often low at the moment of reciprocating movement direction exchange. The combination of the first and second methods can improve the oil intake efficiency and oil output efficiency at the moment of reciprocating movement. At the same time, it also makes the change of oil intake and oil output more accurate and efficient.

[0029] In this embodiment, the hydraulic shell 81 is provided with a collecting chamber 811 for communicating with the regulating chamber 8211, and the hydraulic shell 81 is also provided with a hydraulic chamber 812 for communicating with the collecting chamber 811. A plug plate 832 is installed in the hydraulic chamber 812, and a hydraulic rod 831 for regulating the movement of the plug plate 832 in the hydraulic chamber 812 is also installed on the hydraulic shell 81. The side of the hydraulic shell 81 close to the pump box 9 is also connected to a collecting plate 834, and the collecting plate 834 is used to connect the end of the plunger cylinder 821 away from the collecting chamber 2 91.

[0030] In this embodiment, a flow control valve 833 for regulating the flow of fluid between the manifold chamber 1 811 and the regulating chamber 8211 is also installed on the hydraulic housing 81 .

[0031] In this embodiment, the sensing spring 823 can monitor the change in the axial length of the regulating chamber 8211; specifically, by monitoring the change in the axial length of the regulating chamber 8211, the change in the required oil inlet and oil outlet can be calculated according to the cross-sectional area of ​​the regulating chamber 8211. When the sum of the changes in the axial lengths of all the sensing springs 823 reaches the calculated length value, it is fed back to the flow control valve 833, and the flow control valve 833 closes the channel for fluid flow between the collecting chamber 811 and the regulating chamber 8211. In the process of fluid flow between the collecting chamber 811 and the regulating chamber 8211, the hydraulic rod 831 cooperates with passive expansion and contraction, that is, the exchange power in the process of fluid flow exchange between the collecting chamber 811 and the regulating chamber 8211 is provided by the pressure in the pump box 9.

[0032] In this embodiment, a limit block 824 for axially limiting the sliding of the plunger 822 is further provided in the plunger cylinder 821 .

[0033] In this embodiment, a ball 61 is installed at the lower end of the moving box 6, and a rolling track 11 rollingly connected to the ball 61 is provided on the base 1.

[0034] In this embodiment, the driving mechanism 4 includes a planetary carrier 41 and a connecting ring 2 47, the planetary carrier 41 is rotatably mounted on the driving box 2, the planetary carrier 41 is coaxially fixedly connected to the double-threaded screw 3, a planetary gear 42 is rotatably mounted on the planetary carrier 41, and a connecting ring 1 46 is also rotatably mounted on the planetary carrier 41, a gear ring 44 meshing with the planetary gear 42 is fixed to the inner ring wall of the connecting ring 1 46, a gear ring 45 is fixed to the outer ring wall of the connecting ring 1 46, the connecting ring 2 47 is coaxially rotatably connected to the double-threaded screw 3, one end of the connecting ring 2 47 is fixed with a sun gear 43 meshing with the planetary gear 42, and the other end of the connecting ring 2 47 is fixed with a gear 1 48, the drive box 2 is respectively installed with a motor 1 49 and a motor 2 411, the output end of the motor 1 49 is installed with a gear 2 410 meshing with the gear 1 48, and the output end of the motor 2 411 is installed with a gear 3 412 meshing with the gear ring 45; that is, when the double-threaded screw 3 is regulated for forward and reverse rotation, the square rotation of the planetary carrier 41 can be achieved by regulating the speed of the motor 1 49 and / or the motor 2 411, thereby driving the double-threaded screw 3 to rotate forward and reverse, thereby avoiding the motor 1 49 or the motor 2 411 from rotating forward and reverse at a high frequency, thereby reducing the wear effect of parts and improving the service life.

[0035] The above description is only a preferred specific implementation manner of the invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the invention, which should be covered by the protection scope of the present invention.

Claims

1. A linear reciprocating multi-piston pump, comprising a base, characterized in that: A driving box is installed in the middle of the base, and a double-threaded screw and a driving mechanism are respectively installed on the driving box, and the driving mechanism controls the rotation of the double-threaded screw, and nuts are respectively installed on the two threaded ends of the double-threaded screw, and pump seats are respectively installed at both ends of the base, and a moving box connected to the nut is provided between the pump seat and the driving box, and the moving box is also slidably connected to the base, a pump box is installed on the pump seat, and a plunger mechanism for controlling the pump box is installed on the moving box, a plunger cavity and a manifold cavity two connected to the plunger cavity are respectively provided in the pump box, and an oil inlet and an oil outlet connected to the manifold cavity two are respectively provided outside the pump box, and the plunger mechanism includes a hydraulic shell installed on the moving box, and a plunger rod matching the plunger cavity is installed on the hydraulic shell; The plunger rod comprises a plunger barrel arranged in the plunger cavity, one end of the plunger barrel close to the manifold chamber 2 is sleeved with a plug ring which is in close contact with the plunger cavity, a plunger is installed in the barrel cavity of the plunger barrel, the plunger is connected to the end of the plunger barrel away from the manifold chamber 2 through a sensing spring, and a regulating cavity is formed between the plunger and the barrel cavity of the plunger barrel, and a regulating mechanism for regulating the regulating cavity is also installed on the hydraulic housing; The hydraulic shell is provided with a collecting chamber 1 for communicating with the regulating chamber, the hydraulic shell is also provided with a hydraulic chamber connected with the collecting chamber 1, a plug plate is installed in the hydraulic chamber, and the hydraulic shell is also provided with a hydraulic rod for regulating the movement of the plug plate in the hydraulic chamber. The hydraulic shell is also connected to a collecting plate on the side close to the pump box, and the collecting plate is used to connect the end of the plunger cylinder away from the collecting chamber 2.

2. A linear reciprocating multi-piston pump according to claim 1, characterized in that: The pump box is provided with a plurality of axial plunger cavities, and the plurality of plunger cavities are communicated with the second manifold chamber.

3. A linear reciprocating multi-piston pump according to claim 1, characterized in that: The hydraulic housing is also provided with a flow control valve for regulating the flow of fluid between the manifold chamber 1 and the regulating chamber.

4. A linear reciprocating multi-piston pump according to claim 1, characterized in that: The sensing spring can monitor the change in the axial length of the regulating cavity.

5. A linear reciprocating multi-piston pump according to claim 1, characterized in that: The plunger cylinder is also provided with a limiting block for axially limiting the sliding of the plunger.

6. A linear reciprocating multi-piston pump according to claim 1, characterized in that: A ball bearing is installed at the lower end of the moving box, and a rolling track connected to the ball bearing is provided on the base.

7. A linear reciprocating multi-piston pump according to claim 1, characterized in that: The driving mechanism includes a planetary carrier and a connecting ring 2, the planetary carrier is rotatably mounted on the driving box, the planetary carrier is coaxially fixedly connected with the double-threaded lead screw, a planetary gear is rotatably mounted on the planetary carrier, and a connecting ring 1 is also rotatably mounted on the planetary carrier, a gear ring meshing with the planetary gear is fixed to the inner ring wall of the connecting ring 1, a gear ring is fixed to the outer ring wall of the connecting ring 1, the connecting ring 2 is coaxially rotatably connected with the double-threaded lead screw, a sun gear meshing with the planetary gear is fixed to one end of the connecting ring 2, and a gear 1 is fixed to the other end of the connecting ring 2, a motor 1 and a motor 2 are respectively mounted on the driving box, a gear 2 meshing with the gear 1 is mounted on the output end of the motor 1, and a gear 3 meshing with the gear ring is mounted on the output end of the motor 2.

Images