Double-rotation-direction oblique-axis plunger pump

Abstract

The utility model relates to a double-rotation oblique axis plunger pump, a pump casing rear cover of the plunger pump is internally provided with two backflow oil ducts which are in central symmetry about the central point of the rear cover and are arranged left and right, each backflow oil duct comprises a main body oil duct and a branch oil duct, the main body oil duct is parallel to the axis of a cylinder body of the plunger pump, one end of the main body oil duct is communicated with an inner cavity of a pump casing, and the other end of the main body oil duct is communicated with the branch oil duct. The other end of the main oil duct is in threaded connection with a plug, and a ball plug capable of controlling the branch oil duct to be opened and closed is movably connected into the main oil duct through a reset spring. One end of each branch oil duct is obliquely communicated with the main body oil duct, the other end of each branch oil duct penetrates through the circumferential surface of the rear cover and is in threaded connection with an oil plug used for plugging the corresponding branch oil duct, communicating grooves corresponding to the branch oil ducts are formed in the rear cover, and the branch oil ducts are communicated with the valve plate through the communicating grooves. By means of the spring oil plug structure arranged in the backflow oil channel, oil in the oil suction port of the pump body and oil in the pump shell are the same, left and right rotation of the valve plate are not distinguished any more, and the oil pump has the advantages of being good in universality, convenient to machine and easy to produce and manage.

Description

Technical Field

[0001] The utility model relates to the technical field of bent-axis plunger pumps, in particular to a double-rotation bent-axis plunger pump. Background Art

[0002] The bent-axis plunger pump consists of a pump casing, pump body, main shaft, plunger, cylinder, valve plate, and other components. This structure corresponds to a single direction of rotation, with the valve plate being available in either left-hand or right-hand rotation. This results in a wide variety of models, complex production organization, poor versatility, and inconvenient processing. Furthermore, customers must order according to the direction of rotation, which complicates inventory management. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides a dual-rotation oblique axis plunger pump, which uses a one-way valve to ensure that the oil in the pump body suction port is the same as the oil in the pump casing. The distribution plate no longer distinguishes between left and right rotation. It has good versatility, easy processing, and easy production management.

[0004] The utility model is achieved through the following technical solutions:

[0005] A double-rotating oblique-axis plunger pump is provided, wherein two return oil passages are provided in the rear cover of the pump casing of the plunger pump, which are symmetrical about the center point of the rear cover and arranged on the left and right sides. Each return oil passage includes a main oil passage and a branch oil passage. The main oil passage is parallel to the cylinder axis of the plunger pump, one end of the main oil passage passes through the front surface of the rear cover and is connected to the inner cavity of the pump casing, the other end of the main oil passage passes through the rear surface of the rear cover and is threadedly connected to a screw plug for blocking the main oil passage, and a ball plug is movably connected to the main oil passage through a return spring, which can move along the axis direction of the main oil passage and control the opening and closing of the branch oil passage; one end of the branch oil passage is obliquely connected to the main oil passage, the other end of the branch oil passage passes through the circumference of the rear cover and is threadedly connected to the oil plug for blocking the branch oil passage, and connecting grooves are provided in the rear cover corresponding to the branch oil passages, which connect the branch oil passages and the distribution plate.

[0006] Furthermore, the main oil channel includes a first oil channel and a second oil channel connected in sequence, the diameter of the second oil channel is larger than the first oil channel and the branch oil channel, the branch oil channel is connected to the second oil channel, and the ball plug and the return spring are both arranged in the second oil channel.

[0007] Furthermore, triangular unloading grooves are formed in the middle of both ends of the waist-shaped groove in the low-pressure area and the waist-shaped groove in the high-pressure area on the oil distribution plate.

[0008] By opening unloading grooves in the middle of both ends of the two waist-shaped grooves, the flow pulsation and vibration noise can be effectively reduced, the flow pulsation of the plunger pump and the cavitation inside the plunger pump can be effectively reduced, thereby reducing the internal pressure shock of the plunger pump, reducing working noise, and enhancing the service life of the machinery.

[0009] Beneficial effects of the utility model:

[0010] This utility model utilizes a one-way valve structure formed by two oil return channels centrally symmetrically arranged inside the rear cover of the pump housing, in conjunction with a return spring ball plug provided within the oil return channels. This one-way valve structure connects the oil port with the inner cavity of the pump housing, effectively reducing the pressure of leaked oil within the pump housing, achieving self-lubrication and circulating cooling. This eliminates the need for the valve plate to distinguish between left and right rotation. The only requirement is to pay attention to the desired rotation direction when adjusting the oil inlet pipe, without changing other component structures, to achieve the corresponding pump flow characteristics. This utility model can be applied to engineering machinery, sanitation machinery, and other hydraulic systems, featuring good versatility, ease of processing, and simplified production management, while also being convenient for users to purchase. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view of the overall structure of the utility model.

[0012] Figure 2 This is a cross-sectional view of the return oil passage in the rear cover of the utility model.

[0013] Figure 3 for Figure 1 Right view of .

[0014] Figure 4 for Figure 1 Cross-sectional view at AA in the middle.

[0015] Figure 5 It is a schematic diagram of the rotation direction of the present utility model.

[0016] As shown in the figure:

[0017] 1. Pump casing, 2. Bearing, 3. Rear cover, 4. Main shaft, 5. Return plate, 6. Plunger, 7. Center plunger, 8. Cylinder body, 9. Center spring, 10. Pump body, 11. Ball plug, 12. Return spring, 13. Oil plug, 14. Screw plug, 15. Distribution plate, 16. Unloading groove, 17. Main oil channel, 18. Branch oil channel, 19. Connecting groove. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0019] A dual-rotational bent-axis piston pump comprises a bent-axis piston pump, wherein a main shaft 4 is housed in its pump casing 1 and fixed in a hole by a bearing 2 and a retaining ring; a plunger 6 is mounted on the main shaft 4, and a return plate 5 presses the plunger 6 by a screw so that it rotates with the shaft; the plunger 6 and the center plunger 7 are connected to a cylinder body 8, and a distribution plate 15 which can satisfy dual-rotational directions is mounted on the pump body 10, which is fixed in position by a positioning ring, and the cylinder body 8 is pressed against the plane of the pump body 10 by a center spring 9; the main shaft 4 is driven to rotate by a driving machine, and the main shaft 4 drives the cylinder body 8 to rotate around the center of the distribution plate 15, the inlet and outlet oil chambers of the plunger pump body 10 are separated and connected to the inlet and outlet oil pipes respectively, the oil enters the pump body 10 and the cylinder body 8 from the oil inlet pipe, the plunger 6 squeezes the oil out of the cylinder body 8 and into the oil outlet of the pump body 10, and enters the hydraulic system through the oil outlet pipe to form an oil circuit.

[0020] The rear cover 3 of the pump housing 1 of the plunger pump is provided with two return oil passages which are symmetrical about the center point of the rear cover 3 and are arranged on the left and right. Each return oil passage includes a main oil passage 17 and a branch oil passage 18. The main oil passage 17 is parallel to the axis of the cylinder body 8 of the plunger pump. One end of the main oil passage 17 passes through the front surface of the rear cover 3 and is connected to the inner cavity of the pump housing 1. The other end of the main oil passage 17 passes through the rear surface of the rear cover 3 and is threadedly connected to a screw plug 14 for blocking the main oil passage 17. The main oil passage 17 is connected to the return spring 1 A ball plug 11 is movably connected and can move along the axis of the main oil passage 17 and control the opening and closing of the branch oil passage 18. One end of the branch oil passage 18 is obliquely connected to the main oil passage 17, and the other end of the branch oil passage 18 passes through the circumference of the rear cover 3 and is threadedly connected to the oil plug 13 used to block the branch oil passage 18. Connecting grooves 19 are respectively formed in the rear cover 3 corresponding to the branch oil passages 18. The connecting grooves connect the branch oil passages 18 with the port plate 15, so that the return oil passage is connected as a whole to the oil inlet and outlet and the pump housing 1.

[0021] The main oil passage 17 includes a first oil passage and a second oil passage connected in sequence. The diameter of the second oil passage is larger than the first oil passage and the branch oil passage. The branch oil passage 18 is connected to the second oil passage. The ball plug 11 and the return spring 12 are both arranged in the second oil passage.

[0022] In order to effectively reduce flow pulsation and vibration noise, triangular unloading grooves 16 are formed in the middle of both ends of the low-pressure zone waist-shaped groove and the high-pressure zone waist-shaped groove on the oil distribution plate 15 in the utility model, which can effectively reduce the flow pulsation of the plunger pump and the cavitation inside the plunger pump, thereby reducing the internal pressure impact of the plunger pump, reducing working noise, and enhancing the service life of the machinery.

[0023] In the present invention, two return oil passages are symmetrically machined in the rear cover 3 of the plunger pump, which are connected to the oil inlet and outlet ports, and are connected to the pump housing 1. A ball plug 11 and a return spring 12 are installed in the main oil passage 17. High-pressure oil acts on the ball plug 11 in the corresponding return oil passage, closing the return oil passage and connecting it to the pump housing 1. The oil suction chamber absorbs oil to form a negative pressure, which opens the ball plug 11 in the corresponding return oil passage, connecting the oil suction port to the interior of the pump housing 1, and sucking the oil in the pump housing 1 back to the oil suction port, reducing the pressure in the pump housing 1 and cooling the internal parts. The flow characteristics of the corresponding pump can be obtained by simply paying attention to the required rotation direction when following the oil inlet pipe without changing the structure of other parts. The valve plate 15 no longer distinguishes between left and right rotation, which has good versatility, convenient processing, and easy production management.

[0024] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A dual-rotation oblique-axis plunger pump, characterized in that: Two return oil channels are provided in the rear cover of the pump casing of the plunger pump, which are symmetrical about the center point of the rear cover and arranged on the left and right. Each return oil channel includes a main oil channel and a branch oil channel. The main oil channel is parallel to the cylinder axis of the plunger pump. One end of the main oil channel passes through the front surface of the rear cover and is connected to the inner cavity of the pump casing. The other end of the main oil channel passes through the rear surface of the rear cover and is threadedly connected to a screw plug for blocking the main oil channel. A ball plug is movably connected to the main oil channel through a return spring, which can move along the axis of the main oil channel and control the opening and closing of the branch oil channel; one end of the branch oil channel is obliquely connected to the main oil channel, and the other end of the branch oil channel passes through the circumference of the rear cover and is threadedly connected to the oil plug for blocking the branch oil channel. Connecting grooves are provided in the rear cover corresponding to the branch oil channels, and the connecting grooves connect the branch oil channels and the distribution plate.

2. The dual-rotational inclined-axis plunger pump according to claim 1, characterized in that: The main oil channel includes a first oil channel and a second oil channel connected in sequence. The diameter of the second oil channel is larger than the first oil channel and the branch oil channel. The branch oil channel is connected to the second oil channel. The ball plug and the return spring are both arranged in the second oil channel.

3. The dual-rotational inclined-axis plunger pump according to claim 1, characterized in that: Triangular unloading grooves are formed in the middle of both ends of the waist-shaped groove in the low-pressure area and the waist-shaped groove in the high-pressure area on the oil distribution plate.

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