Exhaust structure for oil pump and injection molding machine

Abstract

This utility model belongs to the field of oil pump venting, and provides a venting structure for an oil pump and an injection molding machine, including: a valve plate, which has a first oil return pipe inside, and the first oil return pipe is connected to the oil return port of the oil tank; a drive module, the output end of which is connected to the oil pump, and the valve plate is installed on the oil pump so that the oil outlet of the oil pump is connected to the first oil return pipe; and an oil delivery module, which is installed on the oil pump, one end of which is connected to the outlet of the oil tank, and the other end is connected to the oil suction port of the oil pump. Compared with the prior art, the advantage of this utility model is that by integrating a pressure module and an adjustable flow valve on the valve plate, the oil pressure in the oil return pipe can be monitored in real time, and the oil flow state can be changed by adjusting the throttle valve to form a directional pressure difference, forcing the air trapped in the system to be discharged with the oil, significantly reducing air resistance and improving the stability and reliability of the oil pump operation.

Description

Technical Field

[0001] This utility model belongs to the field of oil pump venting, specifically relating to a venting structure for oil pumps and an injection molding machine. Background Technology

[0002] In hydraulic systems, the oil pump serves as the core power source, and its operational stability directly impacts the overall system performance. However, during pump startup or restart after a prolonged shutdown, air often accumulates inside the system, leading to problems such as cavitation, flow fluctuations, unstable pressure, and even accelerated oil oxidation, severely affecting the pump's efficiency and lifespan.

[0003] For example, in the daily maintenance of injection molding machines, venting the oil pump is an important task. Air entering the oil pump may be due to negative pressure in the mold cylinder drawing air in from the outside, or due to improper layout of the oil pump suction port, excessively long pipelines, or excessively high suction height making it difficult to vent. Air mixed into the oil pump can lead to problems such as insufficient oil suction, insufficient pressure, and noise, affecting the normal operation of the injection molding machine. In the existing technology, air is usually removed by setting a manual venting valve at the high point of the system or by relying on natural venting. However, these methods have drawbacks such as incomplete venting, slow response, and the need for manual intervention. Although some systems are equipped with automatic venting devices, they are complex in structure, expensive, and mostly consist of independent components with low integration, which is not conducive to the application of compact equipment. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a simple, stable exhaust structure for an oil pump and an injection molding machine that can utilize fluid dynamic changes to force air to be discharged with the oil.

[0005] The purpose of this utility model can be achieved by addressing the following technical problem: proposing an exhaust structure for an oil pump, comprising: a valve plate, wherein a first oil return pipe is configured inside the valve plate, and the first oil return pipe is connected to the oil return port of the oil tank;

[0006] A drive module, the output end of which is connected to an oil pump, and a valve plate is mounted on the oil pump so that the oil outlet on the oil pump is connected to the first return oil pipeline;

[0007] An oil delivery module is installed on the oil pump, with one end of the oil delivery module connected to the outlet of the oil tank and the other end connected to the oil suction port on the oil pump;

[0008] A pressure module and a throttle valve are mounted on the valve plate. The pressure module is used to detect the oil pressure in the first return oil pipeline. By adjusting the throttle valve, the oil flow rate and pressure are changed, forcing air to be discharged with the oil.

[0009] In the above-mentioned exhaust structure for an oil pump, the drive module includes a fixed support and a drive component. The drive component and the oil pump are respectively installed on both sides of the fixed support, and the drive component and the oil pump are connected by a coupling.

[0010] In the above-mentioned exhaust structure for an oil pump, a second return oil pipe and a safety valve are also provided inside the valve plate. The second return oil pipe is connected to the first return oil pipe, and the safety valve is installed on the second return oil pipe.

[0011] In the above-mentioned exhaust structure for an oil pump, both sides of the fixed support are provided with clearance holes.

[0012] In the above-mentioned exhaust structure for an oil pump, the oil delivery module includes a mounting block and an oil inlet pipe. An oil channel is provided in the mounting block, and the oil channel is connected to the oil suction port. The oil inlet pipe is used to connect the oil channel and the outlet of the oil tank.

[0013] In the above-mentioned exhaust structure for an oil pump, a connecting pipe is also provided on the valve plate. One end of the connecting pipe is connected to the first return oil pipe and the second return oil pipe, and the other end of the connecting pipe is connected to an external power device.

[0014] In the above-mentioned exhaust structure for an oil pump, a filter is also provided in the mounting block between the oil pump's suction port and the oil tank.

[0015] In one of the above-mentioned exhaust structures for an oil pump, a container is also installed on the valve plate for collecting the exhaust air.

[0016] In one of the above-mentioned exhaust structures for an oil pump, the pressure module includes a pressure sensor and a pressure gauge placed at the oil pump outlet.

[0017] The technical solution adopted by this utility model to solve its technical problem is to also propose an injection molding machine, including one of the above-mentioned exhaust structures for an oil pump.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention provides an exhaust structure for an oil pump and an injection molding machine. By integrating a pressure module and an adjustable flow valve on the valve plate, the oil pressure in the return oil pipeline can be monitored in real time. By adjusting the throttle valve, the oil flow state can be changed to form a directional pressure difference, which forces the air trapped in the system to be discharged with the oil, significantly reducing the air resistance phenomenon and improving the stability and reliability of the oil pump operation.

[0020] (2) The container is designed to facilitate the collection of exhaust air, and at the same time, the exhaust status and process can be easily observed through the container, so as to make an intuitive judgment that the exhaust is completed.

[0021] (3) The clearance holes on both sides of the fixed support provide convenience for installation, avoid mutual interference between structures, improve assembly efficiency and space utilization, and at the same time, the clearance holes help reduce the weight of the support and achieve lightweight design. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this application;

[0023] Figure 2 It is an exploded view of the oil delivery module, valve plate, and oil pump;

[0024] Figure 3 This is the overall structural oil circuit diagram of this application.

[0025] In the diagram, 1 is the valve plate; 10 is the first return oil pipe; 11 is the second return oil pipe; 110 is the safety valve; and 12 is the connecting pipe.

[0026] 2. Drive module; 20. Oil pump; 200. Oil outlet; 201. Oil suction port; 21. Fixed support; 210. Clearance hole; 22. Drive component; 23. Coupling;

[0027] 3. Oil transfer module; 30. Mounting block; 31. Oil inlet pipe; 32. Filter;

[0028] 4. Pressure module; 40. Pressure sensor; 41. Pressure gauge;

[0029] 5. Throttling valve. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] like Figure 1 As shown, this solution mainly describes a venting structure for an oil pump 20 used in an injection molding machine. However, this venting structure for an oil pump 20 is not limited to use in an injection molding machine, but can also be applied to other equipment that requires venting from the oil pump 20.

[0033] like Figures 1 to 3 As shown, this utility model discloses an exhaust structure for an oil pump 20, comprising: a valve plate 1, which has a first return oil pipe 10 internally connected to the return oil port of an oil tank; a drive module 2, the output end of which is connected to the oil pump 20, and the valve plate 1 is mounted on the oil pump 20 such that the oil outlet 200 of the oil pump 20 is connected to the first return oil pipe 10; an oil delivery module 3, which is mounted on the oil pump 20, one end of which is connected to the outlet of the oil tank and the other end of which is connected to the suction port 201 of the oil pump 20; a pressure module 4 and a throttle valve 5, which are mounted on the valve plate 1. The pressure module 4 is used to detect the oil pressure value in the first return oil pipe 10; and the throttle valve 5 is adjusted to change the oil flow rate and pressure, forcing air to be discharged with the oil.

[0034] During the venting process of oil pump 20, drive module 2 starts to drive oil pump 20 to rotate, drawing oil from oil tank (not shown) through oil delivery module 3. The high-pressure oil portion from oil pump 200 outlet 200 enters the first return oil pipe 10 inside valve plate 1, ready to flow back to oil tank. During this process, pressure module 4 monitors the oil pressure value in the first return oil pipe 10 in real time and transmits the signal to the control system or operator. Furthermore, because a throttle valve 5 is added at pump port safety valve 110 plate 1 in this embodiment, the oil flow rate and pressure are changed by adjusting the opening of throttle valve 5, and air flows with the oil. The liquid flows slowly through the throttle valve 5 area. At the throttle port, local disturbances further promote gas-liquid separation. Finally, the liquid is discharged into the oil tank (i.e., the oil tank connected to the oil pump 20 suction port 201) along with the oil. In other words, this embodiment uses the dynamic changes of the fluid to force air to be discharged with the oil. During operation, the valve port needs to be slowly and finely adjusted, and the oil flow status and system pressure fluctuations should be observed simultaneously. This method can accurately control the exhaust process, improve efficiency by about 30%, and reduce the impact of pressure pulsation on the actuators, ensuring the stable operation of the injection molding machine under high pressure conditions and reducing the risk of equipment failure caused by air mixing.

[0035] The drive module 2 includes a fixed support 21 and a drive component 22. The drive component 22 and the oil pump 20 are respectively installed on both sides of the fixed support 21, and the drive component 22 and the oil pump 20 are connected by a coupling 23.

[0036] like Figure 1 As shown, the drive module 2 uses a fixed support 21 to symmetrically install the drive component 22 (such as a motor) and the oil pump 20 on both sides, and connects them through a coupling 23. The structure layout is reasonable and the force is balanced. This design not only improves the installation accuracy and coaxiality of the drive system and reduces vibration and noise during operation, but also facilitates later maintenance and disassembly. At the same time, the overall support of the fixed support 21 enhances the mechanical stability of the oil pump 20 assembly, prevents loosening of connections or failure of seals due to vibration, and further ensures the stable operation of the system during the exhaust process.

[0037] Preferably, both side walls of the fixed support 21 are provided with clearance holes 210. These clearance holes 210 facilitate the installation and observation between the drive component 22 and the oil pump 20, avoiding structural interference and improving assembly efficiency and space utilization. At the same time, these clearance holes 210 help reduce the weight of the support, achieving a lightweight design. While ensuring strength, this reduces material costs and the overall weight of the equipment, making it suitable for industrial equipment such as injection molding machines that require high space compactness.

[0038] The valve plate 1 is also provided with a second return oil pipe 11 and a safety valve 110. The second return oil pipe 11 is connected to the first return oil pipe 10, and the safety valve 110 is installed on the second return oil pipe 11.

[0039] like Figure 3 As shown, in this embodiment, a second return oil pipe 11 is added inside the valve plate 1, and a safety valve 110 is configured to form a dual return oil passage structure. During normal operation, the main oil circuit circulates through the first return oil pipe 10; when the system pressure rises abnormally (such as when the throttle valve 5 is over-adjusted or blocked), the safety valve 110 automatically opens, allowing some high-pressure oil to be discharged back to the oil tank through the second return oil pipe 11, thus playing an overpressure protection role. This design effectively prevents damage to the oil pump 20, pipes, or seals caused by system overpressure due to venting operations, thereby improving the safety and reliability of the entire hydraulic system.

[0040] The oil delivery module 3 includes a mounting block 30 and an oil inlet pipe 31. The mounting block 30 has an oil channel that connects to the oil suction port 201. The oil inlet pipe 31 connects the oil channel and the outlet of the oil tank.

[0041] like Figure 2 As shown, the oil pump 20 operates continuously, and the oil suction port 201 maintains a stable negative pressure. Oil is continuously and stably delivered to the oil pump 20 through the oil inlet pipe 31 and the oil channel (not shown in the figure), ensuring a stable and reliable connection between the oil tank outlet and the oil pump 20's suction port 201. The oil channel inside the mounting block 30 is optimized (e.g., smooth transitions, avoiding sharp angles) to reduce flow resistance and eddies, ensuring low-resistance, high-efficiency oil supply. This modular design simplifies the pipeline layout, reduces the number of external connections, and lowers the risk of leakage. Preferably, in this embodiment, the oil inlet pipe 31 uses a flexible hose or a rigid pipe, which can be flexibly arranged according to the installation space, while also possessing a certain vibration resistance to prevent loosening or breakage due to vibration.

[0042] Preferably, in this embodiment, the cross-sectional area of ​​the oil inlet pipe is larger than the cross-sectional area of ​​the oil pump outlet, ensuring sufficient flow area at the oil suction end, effectively preventing cavitation and extending the service life of the oil pump.

[0043] The valve plate 1 is also provided with a connecting pipe 12. One end of the connecting pipe is connected to the first return oil pipe 10 and the second return oil pipe 11, and the other end of the connecting pipe is connected to an external power equipment.

[0044] like Figure 2 As shown, by setting a connecting pipe 12 on the valve plate 1, the first return oil pipe 10 and the second return oil pipe 11 are merged and led out to the external power equipment, realizing the efficient integration of the exhaust structure and the main hydraulic system. The overall integrated design optimizes the layout of the whole machine structure.

[0045] A filter 32 is installed within the mounting block 30, located between the oil tank and the oil pump 20's suction port 201. This effectively intercepts particulate impurities in the oil, preventing contaminants from entering the oil pump 20 and causing wear or jamming. The filter 32 is particularly important during the venting process, when the oil flow is unstable and easily stirs up impurities at the bottom of the oil tank. This integrated filtration design protects the core components of the oil pump 20, extends the equipment's service life, and ensures the cleanliness and reliability of the venting process.

[0046] The pressure module 4 includes a pressure sensor 40 and a pressure gauge 41 located at the oil outlet 200 of the oil pump 20. This enables dual monitoring and multi-dimensional feedback of the hydraulic pressure in the return oil pipeline. Specifically, the pressure sensor 40 can collect oil pressure signals in real time and transmit the data to the control system, achieving digital and automated monitoring. This facilitates automatic adjustment of the throttle valve 5 opening according to preset logic during the venting process, improving the intelligence and precision control level of the venting process. Simultaneously, the pressure gauge 41, as a field-reading instrument, provides operators with an intuitive pressure display, facilitating manual judgment and intervention during debugging, maintenance, or when the control system malfunctions.

[0047] The venting operation steps of the oil pump 20 in this embodiment are as follows: Check whether the layout of the oil suction port 201 is standardized, whether there is air in the oil, and whether the connection surfaces between various components are well sealed. Preferably, in this embodiment, grease can be applied to the connection joints between components first. At the same time, ensure that the oil level is within the normal range and use the specified hydraulic oil. Next, try opening and closing the mold to vent (i.e., perform several mold opening and closing actions and observe whether there is any improvement). Remove the oil inlet pipe 31 and oil return pipe of the oil pump 20, open the oil inlet of the oil pump 20, and let the oil flow out until no more oil flows out. Then, connect a container to the outlet of the oil pump 20 to collect the discharged air. Turn on the power of the oil pump 20 and let it run for a few minutes. Observe whether the air in the container has been discharged. If not, repeat the above steps of draining oil and connecting the container to collect air. When no more air comes out of the container, turn off the power of the oil pump 20 and reinstall the oil inlet pipe 31 and oil return pipe of the oil pump 20. Finally, check for any leakage. After ensuring that everything is normal, it can be used. During the exhaust operation, the oil flow rate and pressure are changed by adjusting the opening of the added throttle valve 5, and the dynamic changes in the fluid force the air to be discharged with the oil.

[0048] It should be noted that the driving component 22 in this embodiment can be replaced by other driving devices such as stepper motors and servo motors.

[0049] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A venting structure for an oil pump, characterized in that, include: The valve plate has a first return oil pipe inside, which is connected to the return oil port of the oil tank. A drive module, the output end of which is connected to an oil pump, and a valve plate is mounted on the oil pump so that the oil outlet on the oil pump is connected to the first return oil pipeline; An oil delivery module is installed on the oil pump, with one end of the oil delivery module connected to the outlet of the oil tank and the other end connected to the oil suction port on the oil pump; A pressure module and a throttle valve are mounted on the valve plate. The pressure module is used to detect the oil pressure in the first return oil pipeline. By adjusting the throttle valve, the oil flow rate and pressure are changed, forcing air to be discharged with the oil.

2. The venting structure for an oil pump according to claim 1, characterized in that, The drive module includes a fixed support and a drive component. The drive component and the oil pump are respectively installed on both sides of the fixed support, and the drive component and the oil pump are connected by a coupling.

3. The venting structure for an oil pump according to claim 1, characterized in that, The valve plate is also provided with a second return oil pipe and a safety valve. The second return oil pipe is connected to the first return oil pipe, and the safety valve is installed on the second return oil pipe.

4. The venting structure for an oil pump according to claim 2, characterized in that, Both sides of the fixed support are provided with clearance holes.

5. The venting structure for an oil pump according to claim 1, characterized in that, The oil delivery module includes a mounting block and an oil inlet pipe. The mounting block has an oil channel that connects to the oil suction port. The oil inlet pipe connects the oil channel to the outlet of the oil tank.

6. The venting structure for an oil pump according to claim 3, characterized in that, The valve plate is also provided with a connecting pipe, one end of which is connected to the first return oil pipe and the second return oil pipe, and the other end of which is connected to an external power equipment.

7. The venting structure for an oil pump according to claim 5, characterized in that, The mounting block also includes a filter located between the oil pump's suction port and the oil tank.

8. The venting structure for an oil pump according to claim 1, characterized in that, A container is also installed on the valve plate for collecting the discharged air.

9. The venting structure for an oil pump according to claim 1, characterized in that, The pressure module includes a pressure sensor and a pressure gauge placed at the oil pump outlet.

10. An injection molding machine, characterized in that, Includes an exhaust structure for an oil pump as described in any one of claims 1-9.

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