A plunger pump with a vibration damping and noise reduction device at the oil outlet.

Abstract

This invention discloses a plunger pump with a vibration damping and noise reduction device at the oil outlet. A cavity is created inside the plunger pump's oil distributor cap, and a vibration damping and noise reduction device, rotating with the main shaft, is installed within this cavity. The device is a double-layered shell structure with an internal vibration-absorbing cavity. The outer shell of the device has oil passage grooves evenly distributed circumferentially, the number of which is equal to the number of plungers. A pressure relief groove is provided on the oil distributor cap, connecting the outlet flow channel and the vibration-absorbing cavity. An elastic expansion device is also provided within the vibration-absorbing cavity of the device to dynamically expand the volume of the internal cavity, thereby achieving vibration damping and noise reduction under various operating conditions. This invention has a compact structure, and through the action of the two-stage pressure vibration-absorbing cavity, it can effectively suppress pressure pulsations in the plunger pump's outlet flow channel, thus achieving the effect of vibration damping and noise reduction.

Description

Technical Field

[0001] This invention relates to the field of plunger pumps, and more specifically to a plunger pump with a vibration damping and noise reduction device at the oil outlet. Background Technology

[0002] Hydraulic systems, with their advantages of high power density and high load-bearing rigidity, have been widely used in industries such as aviation, aerospace, and shipbuilding. However, with the development of hydraulic systems towards high speed, high pressure, and high power, vibration and noise problems in hydraulic power pipeline systems are becoming increasingly serious, becoming a bottleneck restricting the development of hydraulic systems towards high pressure and low noise. Piston pumps, with their advantages of high output pressure, high efficiency, and high reliability, are widely used in hydraulic power systems. However, piston pumps experience periodic flow pulsations during operation, causing pressure fluctuations in hydraulic components and pipelines, reducing system reliability and lifespan. Therefore, research is needed on vibration and noise reduction for piston pumps. The distributor plate, as a key component of the piston pump, plays an important role in reducing fluid pulsation vibration. Common vibration reduction methods include installing damping grooves on the distributor plate to mitigate the instantaneous impact of fluid moving from low-pressure to high-pressure areas. However, piston pumps operate under multiple conditions with varying speeds, tilt angles, and pressures. Damping grooves, due to their fixed structural dimensions, have limited adjustment capabilities for piston chamber pressure and cannot achieve vibration reduction under all operating conditions. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a plunger pump with a vibration reduction and noise reduction device at the oil outlet. This device can adjust the pressure in the oil outlet chamber of the plunger pump during the pressure transition period under different operating conditions, thereby achieving vibration reduction under all operating conditions.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A piston pump with a vibration damping and noise reduction device at the oil outlet includes a swashplate, a piston, a main shaft, a cylinder block, a distributor plate, a vibration damping and noise reduction device, an oil distributor cap, and a slipper.

[0006] The main shaft is fixedly connected to the cylinder body, and the main shaft passes through the middle holes of the cylinder body, the distributor plate, and the oil distributor cap in sequence; the main shaft drives the cylinder body to rotate together; the slipper is installed on the swashplate, and the slipper is connected to one end of the plunger through a ball joint, and the other end of the plunger reciprocates in the plunger cavity of the cylinder body to realize the oil suction and oil discharge process;

[0007] The oil distributor cap has an internal cavity, and the vibration damping and noise reduction device is located inside the cavity of the oil distributor cap. The vibration damping and noise reduction device is fixed to the main shaft and rotates together with the main shaft. The vibration damping and noise reduction device is a double-layer shell structure with an internal vibration-absorbing cavity. The outer shell of the vibration damping and noise reduction device has oil passage grooves evenly distributed along the circumference, equal to the number of plungers. The oil distributor cap has a pressure relief groove that connects the outlet flow channel and the vibration-absorbing cavity. Whenever a plunger passes through the dead point position, the oil passage groove rotates to the position that connects with the pressure relief groove, so that the pressure shock generated by the high and low pressure switching is transmitted to the vibration-absorbing cavity of the vibration damping and noise reduction device through pressure fluctuations.

[0008] The vibration reduction and noise reduction device is also equipped with an elastic expansion device inside the vibration absorption cavity, which is used to dynamically expand the volume of the internal cavity, thereby achieving vibration reduction and noise reduction under a wide range of working conditions.

[0009] Furthermore, the elastic expansion device is made of rubber, silicone, or polymer.

[0010] Furthermore, the vibration damping and noise reduction device is connected to the spindle via a spline.

[0011] Furthermore, the position of the connecting outlet channel on the oil separator cover and the pressure relief groove of the vibration absorption cavity in the circumferential direction corresponds to the arrangement position of the plunger, ensuring that when the plunger cavity generates pressure fluctuations at the dead point position, the pressure relief groove is connected to the vibration absorption cavity of the vibration reduction and noise reduction device, thereby generating a vibration absorption effect.

[0012] The beneficial effects of this invention are as follows:

[0013] The present invention provides a plunger pump with a vibration damping and noise reduction device at the oil outlet. This device provides a vibration-absorbing cavity with two-stage vibration absorption capabilities. The elastic expansion device has an expansion capacity that varies with the pressure pulsation amplitude, enabling better absorption of pressure shocks under various operating conditions and providing wide-range vibration damping and noise reduction capabilities. Furthermore, the unloading groove of the vibration-absorbing cavity only connects to the oil outlet channel when the plunger passes the dead center position, thus absorbing pressure shocks. When the plunger moves away from the dead center position, the unloading groove on the vibration-absorbing cavity also moves away from the mating window of the oil outlet channel with the shaft rotation, isolating the vibration-absorbing cavity from the oil outlet channel. The pressure field within the vibration-absorbing cavity cannot, in turn, affect the pump channel pressure, maintaining the stability of the pump pressure. Attached Figure Description

[0014] Figure 1 This is a longitudinal sectional view of a plunger pump with a vibration damping and noise reduction device at the oil outlet, according to an embodiment of the present invention.

[0015] Figure 2 for Figure 1 AA section view in the image.

[0016] In the diagram, 1 is the swashplate, 2 is the plunger, 3 is the main shaft, 4 is the cylinder block, 5 is the distributor plate, 6 is the vibration damping and noise reduction device, 61 is the oil passage groove, 62 is the elastic expansion device, 63 is the vibration absorption cavity, 7 is the oil distributor cap, 71 is the pressure relief groove, and 8 is the slipper. Detailed Implementation

[0017] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0018] like Figure 1 and Figure 2 As shown, the plunger pump with a vibration damping and noise reduction device at the oil outlet in this embodiment includes a swashplate 1, a plunger 2, a main shaft 3, a cylinder block 4, a distributor plate 5, a vibration damping and noise reduction device 6, an oil distributor cap 7, and a slipper 8. The main shaft 3 is connected to the cylinder block 4 via a spline. When the main shaft 3 rotates, it drives the cylinder block 4 to rotate together. The slipper 8 is mounted on the swashplate 1, and one end of the slipper 8 is connected to one end of the plunger 2 via a ball joint. When the plunger 2 rotates together with the cylinder block 4, it is constrained by the swashplate 1. The other end of the plunger 2 reciprocates in the plunger cavity of the cylinder block 4, thereby realizing the oil suction and discharge process. When the plunger passes through the dead center position, the oil in the plunger cavity will switch from a low-pressure oil suction state to a high-pressure oil discharge state. Due to the huge pressure difference, pressure pulsation is easily generated at the outlet of the plunger pump. This will have an adverse effect on the operation of the plunger pump. In this embodiment, a vibration damping and noise reduction device 6 is added to the outlet side. A cavity is created inside the oil distributor cap 7, and the vibration damping and noise reduction device 6 is placed inside this cavity. The device is then connected to the main shaft 3 via a spline sleeve and rotates with the main shaft 3. The vibration damping and noise reduction device 6 is a double-layered shell structure with an internal vibration-absorbing cavity. The outer shell of the device 6 has oil passages 61 evenly distributed circumferentially, equal in number to the number of plungers. Simultaneously, the oil distributor cap 7 has a pressure relief groove 71 connecting the outlet flow channel and the vibration-absorbing cavity. Whenever a plunger 2 passes through the dead center position, the oil passage 61 rotates to a position communicating with the pressure relief groove 71, allowing the pressure shock generated by the high-low pressure switching to propagate through pressure fluctuations to the vibration-absorbing cavity of the vibration damping and noise reduction device 6. At this time, the vibration-absorbing cavity absorbs and buffers the pressure pulsation, reducing its amplitude. Meanwhile, the vibration damping and noise reduction device 6 is equipped with an elastic expansion device 62. When the pump's operating conditions change, pressure pulsations of different amplitudes and frequencies may occur. The elastic expansion device 62 is made of elastic material and can dynamically expand the volume of the vibration damping and noise reduction device cavity, thereby achieving vibration damping and noise reduction under wide operating conditions. When the plunger 2 is no longer in the dead position, the pressure pulsation level in the pump is low, and the oil passage 61 of the vibration damping and noise reduction device 6 is no longer connected to the pressure relief groove 71. This avoids the flow characteristics of the vibration damping and noise reduction device 6 cavity itself affecting the flow of the plunger pump.

[0019] The flexible expansion device 62 is made of rubber, silicone, and polymer.

[0020] The position of the connecting outlet channel on the oil separator cap 7 and the pressure relief groove 71 of the vibration absorption cavity in the circumferential direction corresponds to the arrangement position of the plunger 2. This ensures that when the plunger cavity generates pressure fluctuations at the dead point position, the pressure relief groove 71 is connected to the vibration absorption cavity of the vibration reduction and noise reduction device 6, thereby generating a vibration absorption effect.

[0021] In this embodiment, the main shaft 3 drives the vibration damping and noise reduction device 6 to rotate together with the main shaft 3. When the plunger pump generates pressure pulsation, the oil passage 61 of the vibration damping and noise reduction device 6 is connected to the outlet flow channel. The pressure pulsation is eliminated by the combined action of the vibration absorption cavity 63 and the elastic expansion device 62. When the plunger is far from the dead point position, the oil passage 61 is no longer connected to the oil outlet, reducing the impact of the flow characteristics of the vibration damping and noise reduction device 6 cavity itself on the flow of the plunger pump.

[0022] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A plunger pump with a vibration damping and noise reduction device at the oil outlet, characterized in that, It includes a swashplate (1), a plunger (2), a main shaft (3), a cylinder block (4), a distributor plate (5), a vibration damping and noise reduction device (6), an oil distributor cap (7), and a slipper (8); The main shaft (3) is fixedly connected to the cylinder (4), and the main shaft (3) passes through the middle hole of the cylinder (4), the distribution plate (5), and the oil distributor cover (7) in sequence; the main shaft (3) drives the cylinder (4) to rotate together; the slipper (8) is installed on the swashplate (1), and one end of the slipper (8) is connected to the plunger (2) by a ball joint, and the other end of the plunger (2) reciprocates in the plunger cavity of the cylinder (4) to realize the oil suction and oil discharge process; The oil distributor cap (7) has an internal cavity, and the vibration damping and noise reduction device (6) is located inside the cavity of the oil distributor cap (7). The vibration damping and noise reduction device (6) is fixed to the main shaft (3) and rotates together with the main shaft (3). The vibration damping and noise reduction device (6) is a double-layer shell structure with an internal vibration absorption cavity. The outer shell of the vibration damping and noise reduction device (6) has oil passage grooves (61) evenly distributed along the circumference, equal to the number of plungers. The oil distributor cap (7) has a pressure relief groove (71) that connects the outlet flow channel and the vibration absorption cavity. Whenever a plunger (2) passes through the dead point position, the oil passage groove (61) rotates to the position that connects with the pressure relief groove (71), so that the pressure shock generated by the high and low pressure switching is transmitted to the vibration absorption cavity of the vibration damping and noise reduction device (6) through pressure fluctuation. The vibration reduction and noise reduction device (6) is further provided with an elastic expansion device (62) in the vibration absorption cavity, which is used to dynamically expand the volume of the internal cavity, thereby achieving vibration reduction and noise reduction under wide working conditions.

2. The plunger pump with a vibration damping and noise reduction device at the oil outlet according to claim 1, characterized in that, The elastic expansion device (62) is made of rubber, silicone, and polymer.

3. The plunger pump with a vibration damping and noise reduction device at the oil outlet according to claim 1, characterized in that, The vibration reduction and noise reduction device (6) is connected to the main shaft (3) via a spline.

4. The plunger pump with a vibration damping and noise reduction device at the oil outlet according to claim 1, characterized in that, The connecting outlet channel opened on the oil separator cover (7) and the pressure relief groove (71) of the vibration absorption cavity are positioned in the circumferential direction corresponding to the arrangement position of the plunger (2), ensuring that when the plunger cavity generates pressure fluctuations at the dead point position, the pressure relief groove (71) is connected to the vibration absorption cavity of the vibration reduction and noise reduction device (6), thereby generating a vibration absorption effect.

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