Multi-point pumps

Abstract

The multi-point pump comprises a support frame and a pump body arranged on the support frame, wherein the pump body is provided with at least three plunger units in the circumferential direction; an oil tank is connected and arranged on the pump body, the oil tank stores lubricating oil, and the inside of the oil tank is communicated with the pump body; a hydraulic motor is arranged on the support frame, a crankshaft assembly is connected to the output shaft of the hydraulic motor, and the crankshaft assembly is driven to rotate; a stirring rod assembly is installed on the crankshaft assembly, the stirring rod assembly is located in the oil tank, and the stirring rod assembly rotates with the rotation of the crankshaft assembly. The pump body is provided with a plurality of plunger units, each plunger unit can be directly used as an oil supply source of a set of progressive system by cooperating with a safety valve, and the plunger units can be combined with each other to realize higher flow.

Description

Technical Field

[0001] This invention relates to a multi-point pump. Background Technology

[0002] Many multi-point pump plungers on the market are imported products, which have a relatively complex structure and high price, making the replacement process of parts more complicated.

[0003] CN219571586U discloses a simple grease multi-point pump plunger, including an O-ring, an adjusting screw, a locking nut, a mounting valve body, a feed valve assembly, and a discharge valve assembly. The O-ring is fitted onto the mounting valve body. The adjusting screw is inserted into one end of the mounting valve body and connected to the feed valve assembly located at the other end of the valve body. The discharge valve assembly is connected to the middle position of the mounting valve body. The locking nut is located at one end of the mounting valve body and is threadedly connected to the adjusting screw.

[0004] Although this solution also provides a multi-point pump, it cannot simultaneously supply oil to multiple lubrication points. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to achieve simultaneous oil supply to multiple lubrication points, and to provide a multi-point pump.

[0006] To solve the above problems, the present invention is achieved through the following technical solution: A multi-point pump includes a support frame and a pump body located on the support frame. The pump body has at least three plunger units arranged in a circumferential direction. An oil tank is connected to the pump body, and the oil tank stores lubricating grease. The interior of the oil tank is connected to the pump body. A hydraulic motor is mounted on the support frame, and a crankshaft assembly is connected to the output shaft of the hydraulic motor to drive the crankshaft assembly to rotate. An agitator assembly is mounted on the crankshaft assembly. The agitator assembly is located inside the oil tank and rotates as the crankshaft assembly rotates.

[0007] The stirring rod assembly includes a connecting rod that is driven to the output shaft of a hydraulic motor. An L-shaped plate is fixedly connected to the connecting rod. The L-shaped plate includes a horizontal plate and a vertical plate, with the vertical plate close to the inner wall of the oil tank. An impeller is fixedly mounted on the connecting rod.

[0008] The vertical plate consists of multiple sub-vertical plates, all of which are arranged in parallel. Adjacent sub-vertical plates are connected together by connecting plates, and each sub-vertical plate is at a different distance from the inner wall of the oil tank.

[0009] The impeller has upward-curving blades at its end, and the blades and impeller are integrated into one piece.

[0010] An oil distribution plate is provided below the oil tank, and at least one oil scraper is provided on the oil distribution plate; each oil scraper includes a support rod and a crossbar located at the top of the support rod. The support rod is fixed on the outermost circumference of the oil distribution plate, and the height of the crossbar is higher than the height of the impeller and the blades.

[0011] The plunger unit includes a piston connected to the crankshaft assembly, with the other end of the piston slidably disposed within the plunger unit housing. A first oil chamber and a second oil chamber are provided within the plunger unit housing, wherein the piston is located on one side of the first oil chamber, and the other side of the first oil chamber communicates with the second oil chamber. A suction port is provided on the first oil chamber, and the suction port communicates with the pump body. A one-way valve is provided within the second oil chamber.

[0012] A spring is fitted on the outer circumference of the piston. One end of the spring is fixedly connected to a spring baffle, and the other end of the spring is connected to a stepped surface on the piston unit housing.

[0013] The hydraulic motor is connected to the hydraulic power source through a balance valve assembly; the balance valve assembly includes a valve body, on which a pressure gauge, a cartridge throttle valve, and a pressure reducing relief valve are installed.

[0014] A flow compensation device is added to the balancing valve assembly; the flow compensation device consists of a flow sensor, a regulating valve, and a control module. The flow sensor is installed at the oil outlet of the cartridge-type throttle valve. The flow sensor detects the oil flow in real time and transmits the signal to the control module when a change in flow is detected. The regulating valve body is mounted on the valve body. The regulating valve is connected to a mechanical transmission mechanism, which includes a gear, a rack, and a connecting piece. The gear meshes with the rack and is driven by a drive mechanism. A connecting piece is fixed to the rack and is connected to the regulating valve core. The regulating valve core is linked to the cartridge throttle valve core. The control module receives signals from the flow sensor, quickly calculates the adjustment commands for the regulating valve and the throttle valve according to the preset control algorithm, drives the regulating valve to operate, and fine-tunes the opening of the cartridge throttle valve through the mechanical transmission mechanism.

[0015] The control algorithm includes the following steps: Step 1: The flow sensor is installed near the oil outlet of the cartridge-type throttle valve to detect the oil flow rate Q1 in real time; Step 2: The control module receives the oil flow rate Q1 from the flow sensor and compares it with the preset flow rate Q. 标 By comparing the data, the adjustment commands of the control valve and throttle valve can be quickly calculated, i.e., the production compensation flow value Q. 补 =|Q 标 - Q1|; Step 3: The control module drives the actuator of the regulating valve. The actuator rotates the gear, which drives the rack, thereby moving the valve core of the regulating valve. This adjusts the position of the cartridge throttle valve core and finely adjusts the opening of the cartridge throttle valve through the mechanical transmission mechanism. Step 4: The control module continuously monitors the signal from the flow sensor and makes dynamic adjustments based on system feedback to ensure stable oil flow.

[0016] Compared with existing technologies, the present invention has the following advantages: The present invention has multiple plunger units on a single pump body. Each plunger unit can be used independently with a safety valve as the oil supply source for a progressive system, or they can be combined to achieve a higher flow rate. Furthermore, the present invention, combined with a distributor, pipeline accessories, etc., forms a complete oil supply system, providing oil to various necessary lubrication points of the equipment as needed. This reduces frictional resistance, contact wear, and friction surface temperature, while also providing some rust prevention, vibration damping, and sealing assistance. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a structural diagram of a plunger unit; Figure 4 A schematic diagram showing the state of the plunger unit drawing in lubricating grease; Figure 5 This is a schematic diagram showing the state in which the crankshaft assembly will push the piston in another direction; Figure 6 A schematic diagram showing the state of grease pumping for the plunger unit; Figure 7 This is a structural diagram of the stirring rod assembly; Figure 8 This is a structural diagram of the balance valve assembly. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] like Figure 1 , Figure 2 As shown, the multi-point pump includes a support frame 9 and a pump body 3 located on the support frame 9. The pump body 3 is provided with at least three plunger units 7 along the circumferential direction. An oil tank 1 is connected to the pump body 3. The oil tank 1 stores lubricating grease and is connected to the pump body 3.

[0021] A hydraulic motor 5 is installed on the support frame 9, and a crankshaft assembly 4 is connected to the output shaft of the hydraulic motor 5 to drive the crankshaft assembly 4 to rotate; the crankshaft assembly 4 pushes the plunger rod in the plunger unit 7 to reciprocate to realize the oil suction and oil discharge process.

[0022] like Figure 2 As shown, the crankshaft assembly 4 includes a main journal connected to the output shaft of the hydraulic motor 5, and the main journal is connected to an eccentric connecting rod journal. More simply, the crankshaft assembly 4 can be an eccentric bushing.

[0023] like Figure 3 As shown, the plunger unit 7 includes a piston 72 connected to the crankshaft assembly 4, with the other end of the piston 72 slidably disposed within the plunger unit housing 71. A first oil chamber 74 and a second oil chamber 77 are disposed within the plunger unit housing 71. The piston 72 is located on one side of the first oil chamber 74, and the other side of the first oil chamber 74 communicates with the second oil chamber 77. A suction port 78 is formed in the first oil chamber 74, and the suction port 78 communicates with the pump body 3. A one-way valve 75 is disposed within the second oil chamber 77. It should be noted that a tapered hole is provided at the front end of the second oil chamber 77, with the smaller diameter side of the tapered hole communicating with the first oil chamber 74. The front diameter of the one-way valve 75 is larger than the diameter of the tapered opening, ensuring that the one-way valve 75 can only move linearly to the tapered hole of the second oil chamber and cannot move into the first oil chamber 74. Furthermore, the maximum diameter of the one-way valve 75 is smaller than the inner diameter of the second oil chamber 77.

[0024] A spring 73 is fitted on the outer circumference of the piston 72. One end of the spring 73 is fixedly connected to a spring baffle 79, and the other end of the spring 73 is connected to a stepped surface on the piston unit housing 71. It should also be noted that a limiting device is provided at one end of the piston 72 located inside the piston unit housing 71 to prevent the piston 72 from coming out of the piston unit housing 71.

[0025] Better still, an annular sealing gasket 76 is fitted on the outer circumference of the plunger unit housing 71.

[0026] The working principle of plunger unit 7 is as follows: Figure 2 As shown, the output shaft of the hydraulic motor 5 is vertically arranged, and a crankshaft assembly 4 is fitted onto the output shaft of the hydraulic motor 5. When the hydraulic motor 5 starts working, the crankshaft assembly 4 will reciprocate (X1, X2, X3). The plunger unit 7 is installed in the pump body 3, and the movement of the crankshaft assembly 4 drives the plunger unit 7 to reciprocate.

[0027] like Figure 4 As shown, when the crankshaft assembly 4 moves away from the plunger unit 7 (X1 position), the piston 72 is pulled out by the crankshaft assembly 4. At this time, the spring 73 pushes the piston 72 towards the crankshaft assembly 4. During this movement, the pump body 3 draws lubricating grease into the plunger unit 7 through the two suction holes 78. See [reference needed]. Figure 4 There are two arrows, one above the other.

[0028] like Figure 5 As shown, the hydraulic motor 5 continues to rotate, and the crankshaft assembly 4 pushes the piston 72 in another direction. During this movement, the piston 72 closes the two intake ports 78 and pushes the sucked-in grease toward the one-way valve 75.

[0029] like Figure 6 As shown, the one-way valve 75 opens under the pressure generated by the piston and grease, and the grease flows to the outlet of the plunger unit 7 and enters the lubrication system.

[0030] In this invention, up to 10 plunger units can be installed on the pump body 3, with positions ranging from 1# to 10#. The plunger units 7 can pump flow rates of 0.075 mL / cy (1.5), 0.125 mL / cy (1.5), and 0.225 mL / cy (4.5). Each plunger unit can be used independently with a safety valve as the oil supply source for a progressive system, or they can be combined to achieve a higher flow rate.

[0031] The plunger unit 7 is connected to the pump body 3 through the plunger unit mounting hole. The empty plunger unit mounting hole can be sealed with an internal hexagonal plug.

[0032] Furthermore, an agitator assembly 6 is mounted on the crankshaft assembly 4. The agitator assembly 6 is located inside the oil tank 1 and rotates as the crankshaft assembly 4 rotates. Figure 2 , Figure 7 As shown, the stirring rod assembly 6 includes a connecting rod 61 that is driven by the output shaft of the hydraulic motor 5. An L-shaped plate is fixedly connected to the connecting rod 61. The L-shaped plate includes a horizontal plate 62 and a vertical plate. The vertical plate is close to the inner wall of the oil tank 1, which facilitates scraping away the grease on the side wall of the oil tank 1. An impeller 63 is fixedly installed on the connecting rod 61. The impeller 63 presses oil downward to prevent the multi-point pump plunger from cavitating.

[0033] Better yet, the vertical plate includes multiple sub-vertical plates 65, all of which are arranged in parallel and are connected together by connecting plates. Each sub-vertical plate 65 is at a different distance from the inner wall of the oil tank 1, so as to evenly stir the lubricating grease in the oil tank 1.

[0034] Even better, the impeller 63 is provided with an upward-curving blade 64 at its end, and the blade 64 and the impeller 63 are integrally formed.

[0035] Additionally, an oil distribution plate 2 is provided below the oil tank 1, and at least one oil scraper is provided on the oil distribution plate 2, as shown in the figure. Each oil scraper includes a support rod 21 and a crossbar 22 located at the top of the support rod 21. The support rod 21 is fixed on the outermost circumference of the oil distribution plate 2. The height of the crossbar 22 is higher than the height of the impeller 63 and the blade 64, so that the impeller 63 and the blade 64 can pass under the crossbar 22. While the impeller 63 is stirring and pressing the oil downward, the crossbar 22 scrapes the oil off the impeller 63 and the blade 64 again, so that the lubricating grease does not stick to the side wall of the oil tank, the impeller 63, and the blade 64.

[0036] The working principle of this invention is as follows: A hydraulic power source outputs high-pressure, high-flow hydraulic oil. The hydraulic oil enters the balance valve assembly 8, where it is depressurized and throttled before entering the hydraulic motor 5. The hydraulic motor 5 is driven by the hydraulic oil to rotate at a certain speed. The output shaft of the hydraulic motor 5 is connected to the crankshaft assembly 4, directly driving the crankshaft assembly 4 to rotate. The crankshaft assembly 4 pushes the plunger rod in reciprocating motion to achieve the plunger's oil suction and discharge process. The agitator assembly 6 is mounted on the crankshaft and rotates with the crankshaft assembly 4. The agitator scrapes the grease from the side wall of the oil tank, and the impeller presses the oil downwards, preventing the multi-point pump plunger from cavitating.

[0037] It should be noted that, as Figure 8 As shown, the balance valve assembly 8 includes a valve body 81, on which a pressure gauge 82, a cartridge-type throttle valve 83, a pressure-reducing relief valve 84, and other connectors are mounted. During operation, the hydraulic oil supply pipe is connected to the inlet of the balance valve assembly 8, and the outlet of the balance valve assembly 8 is connected to the hydraulic oil tank. The pressure-reducing relief valve 84 is used to adjust the set pressure value of the hydraulic motor 5, and the pressure value is displayed on the pressure gauge 82.

[0038] During operation, the cartridge-type throttle valve 83 may exhibit slow adjustment response, failing to quickly adapt to changes in oil flow rate, thus affecting the equipment's response speed and stability. To address this issue, a flow compensation device is added to the balance valve assembly 8. This device comprises a flow sensor, a regulating valve, and a control module. The flow sensor monitors the oil flow rate in real time, transmitting a signal to the control module when a flow change is detected. Based on the flow change, the control module rapidly drives the regulating valve to compensate for the slow adjustment response of the cartridge-type throttle valve 83, ensuring stable oil output.

[0039] Ideally, the flow sensor is installed at the oil outlet of the cartridge-type throttle valve 83, allowing for more accurate real-time detection of the actual oil flow rate from the valve. This is because the oil condition near the outlet better reflects the actual oil output of the throttle valve, avoiding interference from other factors. The flow sensor is a high-precision, high-sensitivity model, ensuring rapid and accurate detection of minute flow changes and stable signal transmission to the control module.

[0040] The regulating valve body is mounted on the valve body 81. The regulating valve is connected to a mechanical transmission mechanism. When the control module drives the regulating valve to operate, the opening of the regulating valve is finely adjusted through the mechanical transmission mechanism. This makes the regulating actions of the cartridge throttle valve 83 and the regulating valve more coordinated and consistent, further improving the accuracy and speed of oil output regulation and reducing fluctuations in oil output.

[0041] The mechanical transmission mechanism includes gears, racks, and connecting parts. The gears mesh with the rack, and the gears are driven by a drive mechanism. A connecting part is fixed to the rack, and this connecting part is connected to the control valve core. The control valve core is linked to the cartridge-type throttle valve core. When the control module drives the control valve to operate, the position of the control valve core is adjusted through the gear and rack transmission mechanism, thereby adjusting the opening of the cartridge-type throttle valve and achieving fine-tuning of its 83° opening.

[0042] At the same time, special treatments, such as quenching and hard chrome plating, are applied to the surfaces of gears and racks to improve their wear resistance and corrosion resistance, thereby extending the service life of mechanical transmission mechanisms.

[0043] The control module receives signals from the flow sensor, quickly calculates the adjustment commands for the regulating valve and the throttle valve based on a preset control algorithm, drives the regulating valve to operate, and fine-tunes the opening of the cartridge-type throttle valve 83 through a mechanical transmission mechanism. The control algorithm includes the following steps: Step 1: The flow sensor is installed near the oil outlet of the cartridge-type throttle valve 83 to detect the oil flow rate Q1 in real time.

[0044] Step 2: The control module receives the oil flow rate Q1 from the flow sensor and compares it with the preset flow rate Q. 标 By comparing the data, the adjustment commands of the control valve and throttle valve can be quickly calculated, i.e., the production compensation flow value Q. 补 =|Q 标 - Q1|; Step 3: The control module drives the drive mechanism of the regulating valve to move. When the drive mechanism moves, the gear rotates, which drives the rack to move, thereby moving the valve core of the regulating valve. This adjusts the position of the cartridge throttle valve core. Through the mechanical transmission mechanism, the opening of the cartridge throttle valve 83 is finely adjusted to improve the adjustment accuracy and speed. Step 4: The control module continuously monitors the signal from the flow sensor and makes dynamic adjustments based on system feedback to ensure stable oil flow.

[0045] This invention combines a distributor, pipeline accessories, and other components to form a complete oil supply system. It provides oil to the necessary lubrication points of the equipment as needed, which can reduce frictional resistance, reduce contact wear, and lower the temperature of friction surfaces. It also provides some rust prevention, shock absorption, and sealing assistance.

[0046] This invention can be combined with a distributor to form a centralized lubrication system, or it can directly supply oil to lubrication points to form a multi-line system.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A multi-point pump, characterized in that: Includes a support frame (9) and a pump body (3) located on the support frame (9). The pump body (3) is provided with at least three plunger units (7) in the circumferential direction. An oil tank (1) is connected to the pump body (3). The oil tank (1) stores lubricating grease and is connected to the pump body (3). A hydraulic motor (5) is provided on the support frame (9), and a crankshaft assembly (4) is connected to the output shaft of the hydraulic motor (5) to drive the crankshaft assembly (4) to rotate; An agitator assembly (6) is mounted on the crankshaft assembly (4). The agitator assembly (6) is located inside the oil tank (1) and rotates as the crankshaft assembly (4) rotates.

2. The multi-point pump according to claim 1, characterized in that: The stirring rod assembly (6) includes a connecting rod (61) that is driven to the output shaft of the hydraulic motor (5). An L-shaped plate is fixedly connected to the connecting rod (61). The L-shaped plate includes a horizontal plate (62) and a vertical plate. The vertical plate is close to the inner wall of the oil tank (1). An impeller (63) is fixedly installed on the connecting rod (61).

3. The multi-point pump according to claim 2, characterized in that: The vertical plate includes multiple sub-vertical plates (65), all of which are arranged in parallel. Adjacent sub-vertical plates (65) are connected together by connecting plates. Each sub-vertical plate (65) is at a different distance from the inner wall of the oil tank (1).

4. The multi-point pump according to claim 2, characterized in that: The impeller (63) has an upward-curving blade (64) at its end, and the blade (64) and the impeller (63) are integrated.

5. The multi-point pump according to claim 4, characterized in that: An oil distribution plate (2) is provided below the oil tank (1), and at least one oil scraper is provided on the oil distribution plate (2); each oil scraper includes a support rod (21) and a crossbar (22) located at the top of the support rod (21). The support rod (21) is fixed on the outermost circumference of the oil distribution plate (2), and the height of the crossbar (22) is higher than the height of the impeller (63) and the blade (64).

6. The multi-point pump according to claim 1, characterized in that: The plunger unit (7) includes a piston (72) connected to the crankshaft assembly (4), and the other end of the piston (72) is slidably disposed in the plunger unit housing (71). A first oil chamber (74) and a second oil chamber (77) are provided in the plunger unit housing (71). The piston (72) is located on one side of the first oil chamber (74), and the other side of the first oil chamber (74) is connected to the second oil chamber (77). A suction hole (78) is opened on the first oil chamber (74), and the suction hole (78) is connected to the pump body (3). A one-way valve (75) is provided in the second oil chamber (77).

7. The multi-point pump according to claim 6, characterized in that: A spring (73) is fitted on the outer circumference of the piston (72). One end of the spring (73) is fixedly connected to the spring baffle (79), and the other end of the spring (73) is connected to the stepped surface on the piston unit housing (71).

8. The multi-point pump according to claim 1, characterized in that: The hydraulic motor (5) is connected to the hydraulic source via the balance valve assembly (8); the balance valve assembly (8) includes a valve body (81), on which a pressure gauge (82), a cartridge throttle valve (83) and a pressure relief valve (84) are provided.

9. The multi-point pump according to claim 8, characterized in that: A flow compensation device is added to the balancing valve assembly (8); the flow compensation device consists of a flow sensor, a regulating valve and a control module; Among them, the flow sensor is installed at the oil outlet of the cartridge throttle valve (83). The flow sensor detects the oil flow in real time and transmits the signal to the control module when it detects a change in flow. The regulating valve body is set on the valve body (81). The regulating valve is connected to a mechanical transmission mechanism, which includes a gear, a rack and a connecting piece. The gear meshes with the rack and is driven by a drive mechanism. A connecting piece is fixed on the rack and is connected to the regulating valve core. The regulating valve core is linked with the cartridge throttle valve core. The control module receives the signal from the flow sensor, quickly calculates the adjustment commands of the regulating valve and the throttle valve according to the preset control algorithm, drives the regulating valve to act, and finely adjusts the opening of the cartridge throttle valve (83) through the mechanical transmission mechanism.

10. The multi-point pump according to claim 9, characterized in that: The control algorithm includes the following steps: Step 1: The flow sensor is installed near the oil outlet of the cartridge-type throttle valve (83) to detect the oil flow rate Q1 in real time; Step 2: The control module receives the oil flow rate Q1 from the flow sensor and compares it with the preset flow rate Q. 标 By comparing the data, the adjustment commands of the control valve and throttle valve can be quickly calculated, i.e., the production compensation flow value Q. 补 =|Q 标 - Q1|; Step 3: The control module drives the driving mechanism of the regulating valve to move. When the driving mechanism moves, the gear rotates, which drives the rack to move, thereby moving the valve core of the regulating valve, and thus adjusting the position of the cartridge throttle valve core. Through the mechanical transmission mechanism, the opening of the cartridge throttle valve (83) is finely adjusted. Step 4: The control module continuously monitors the signal from the flow sensor and makes dynamic adjustments based on system feedback to ensure stable oil flow.

Images