Differential pressure sensing bypass valve for a neat oil machine

Abstract

The utility model discloses a differential pressure sensing bypass valve for oil purifier, including pressure difference valve block, bypass valve body, valve core, adjusting screw rod, reset spring and pressure difference sensor. Bypass valve body is connected with pressure difference valve block through the thread, and the valve core sets up in the regulating valve chamber of bypass valve body, and the valve core is the plunger type structure, and the sealed cone surface of its front end forms the sealed cooperation with valve body. Adjusting screw rod is connected with bypass valve body thread, and can change the compression of reset spring through the rotation adjusting screw rod, thereby adjusting bypass opening pressure. Pressure difference valve block inside is equipped with import oil circuit and export oil circuit. When the system pressure difference rises to the set value, the pressure difference sensor exports the alarm signal, and simultaneously, the valve core overcomes the spring force of reset spring and opens the bypass channel, and the valve core is automatically reset and closes after the system pressure restores normal. The structure realizes the double protection of mechanical bypass and electric signal alarm, has the advantages such as compact structure, pressure adjustable, response sensitive and convenient maintenance.

Description

Technical Field

[0001] This utility model relates to the field of bypass technology for oil purification systems, specifically a differential pressure sensing bypass valve for an oil purifier. Background Technology

[0002] An oil purifier is a mechanical device used to remove impurities and moisture from oil, improving its quality and properties. It is widely used in industrial systems such as power, metallurgy, chemical, and machining. Its main function is to improve the purity of media such as insulating oil, lubricating oil, and hydraulic oil, thereby ensuring the safe operation of equipment and extending its service life.

[0003] In an oil purifier system, the filter element is the key component for filtration. When the filter element becomes clogged or the oil viscosity increases, a significant pressure difference will occur between the system's inlet and outlet. If the pressure difference is too high, the oil cannot pass smoothly through the filter element, causing a sharp rise in internal system pressure, which may lead to equipment overload, seal rupture, or even damage to the oil pump or motor. To prevent this, a bypass valve is usually installed in the oil circuit. When the pressure difference exceeds a set value, the bypass valve automatically opens, allowing some oil to bypass the filter element and flow directly into the outlet, thus protecting the system.

[0004] However, the existing bypass valve structure of oil purifiers still has the following technical defects: Most commonly used bypass valves are designed as an integral part of the filter element housing. The filter element has a short replacement cycle, while the bypass valve has a long lifespan. The combination of replacing both leads to resource waste and increases maintenance costs.

[0005] Traditional bypass valves rely solely on mechanical pressure to open, making it impossible for system operators to detect filter blockage in advance. This can easily lead to situations where filters are not replaced on time or differential pressure increases without alarms, increasing the risk of equipment damage.

[0006] Patent document CN203703577U discloses a bypass valve for an oil filter. This device includes a valve body, a piston, and a spring structure. When the oil pressure differential reaches a predetermined value, the piston overcomes the spring force under pressure to open the bypass channel, allowing the oil to flow directly around the filter element, thereby achieving system protection. This solution can avoid system failures caused by excessive filtration resistance to a certain extent. However, because it has a built-in filter element structure, it cannot be replaced or maintained independently. It also lacks differential pressure sensing and alarm functions, making it difficult to meet the real-time monitoring and adjustable control requirements of modern oil purification equipment. Therefore, there is an urgent need for improved technologies to solve these problems. Utility Model Content

[0007] The technical problem this utility model aims to solve is to overcome existing defects and provide a differential pressure sensing bypass valve for oil purifiers. By integrating an adjustable bypass valve and a differential pressure sensing device on the differential pressure valve block, it achieves real-time monitoring and intelligent bypass control of the oil circuit system differential pressure. It possesses both the reliability of traditional mechanical bypass valves and electronic detection and alarm functions. The structure is reasonably designed, responds quickly, has good sealing performance, and is convenient to install and maintain. It can effectively overcome the problems of inconvenient filter replacement, lack of differential pressure signal feedback, and inability to adjust the pressure of the bypass valve in the prior art, and can effectively solve the problems in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A differential pressure sensing bypass valve for an oil purifier, comprising a differential pressure valve block, a bypass valve body, a valve core, a differential pressure sensor, and an adjusting screw. The bypass valve body is threadedly connected to the differential pressure valve block. The valve core is disposed in the adjusting valve chamber inside the bypass valve body. The valve core has a plunger-type structure, and its front sealing cone surface forms a sealing fit with the bypass valve body. The adjusting screw is threadedly connected to the bypass valve body. A return spring is provided between the end of the adjusting screw and the valve core. When the pressure is greater than the opening pressure value, the pressure acts on the front of the valve core and overcomes the return spring to push the valve core axially, putting the valve core in the open state. When the pressure value decreases, the return spring provides elastic preload to keep the valve core in the closed state. The adjustable screw changes its axial displacement, thereby altering the compression of the return spring and regulating the opening pressure of the valve core. The opening pressure can be adjusted according to customer requirements. The differential pressure valve block has an inlet and outlet oil passage. When the valve core is open, the inlet and outlet oil passages are connected, allowing bypass. Pressure taps are located on both the inlet and outlet oil passages, connected to a differential pressure sensor. The differential pressure sensor detects the system differential pressure. When the system pressure rises to the set value of the differential pressure sensor, the sensor sends an electrical signal, which can be indicated by a buzzer sounding to signal an abnormality. The valve core then overcomes the return spring pressure and begins bypassing. After the system returns to normal, the valve core closes and returns to its initial state.

[0009] Furthermore, the bypass valve body has a valve core end hole at its end, which is connected to the inlet oil circuit. Under the action of the return spring, the valve core contacts and seals with the valve core end hole. The bypass valve body has a side through hole in the circumferential direction. When the valve core is in the open state, the side through hole is connected to the outlet oil circuit.

[0010] Furthermore, the differential pressure valve block is provided with an outlet and an inlet on its side. The inlet corresponds to the inlet oil circuit, and the outlet corresponds to the outlet oil circuit. The inlet and outlet are respectively connected to the inlet and outlet of the oil purifier.

[0011] Furthermore, an adjusting nut is provided on the adjusting screw, which allows for easy rotation of the adjusting screw, making operation convenient. A sealing ring is provided at the connection between the adjusting screw and the bypass valve body to ensure sealing.

[0012] Furthermore, the differential pressure sensor is a differential pressure electrical sensor or differential pressure switch, capable of outputting electrical signals, audible and visual alarm signals, or communication signals with the control system.

[0013] Furthermore, the differential pressure valve block and the bypass valve body adopt a modular structure design, and a sealing ring is provided between the differential pressure valve block and the bypass valve body to facilitate disassembly and independent replacement.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The differential pressure detection, adjustable bypass, and oil circuit valve block structure are integrated into one unit, realizing the organic combination of mechanical protection and intelligent monitoring. This structure integrates the differential pressure sensor, bypass valve body, and return spring-loaded valve core on the differential pressure valve block, so that bypass control and differential pressure detection are completed in the same module. This not only simplifies the installation structure but also significantly improves the systematization and reliability of the device. This modular design allows the bypass valve to exist independently of the filter element. Users can maintain or adjust the bypass component separately without replacing the filter element, which greatly reduces the equipment operation and maintenance costs.

[0015] 2. The valve core opening pressure can be precisely adjusted by rotating the adjusting screw, achieving flexible adaptation to different oil purifier models or different system pressure conditions. When the system differential pressure rises to the set value, the differential pressure sensor will immediately output an electrical signal or alarm signal to remind the operator of filter blockage or system abnormality, thereby effectively preventing the system from operating under overpressure. This structure realizes the dual functions of mechanical bypass and electrical signal alarm, enhancing the safety of the oil purifier system. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the present invention. Figure 2 This is a top view of the structure of this utility model.

[0017] In the diagram: 1 Differential pressure valve block, 2 Bypass valve body, 3 Inlet oil passage, 4 Pressure tapping hole, 5 Adjusting screw, 6 Adjusting nut, 7 Return spring, 8 Adjusting valve chamber, 9 Valve core, 10 Outlet oil passage, 11 Outlet, 12 Valve core end hole, 13 Side through hole, 14 Inlet, 15 Differential pressure sensor. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "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 utility model 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 utility model. Example

[0019] Please see Figure 1-2 This utility model provides a technical solution: a differential pressure sensing bypass valve for an oil purifier, including a differential pressure valve block 1, a bypass valve body 2, a valve core 9, a differential pressure sensor 15, and an adjusting screw 5; the bypass valve body 2 is connected to the differential pressure valve block 1 by threads, the valve core 9 is disposed in the adjusting valve chamber 8 inside the bypass valve body 2, the valve core 9 has a plunger structure, and its front sealing cone surface forms a sealing fit with the bypass valve body 2; the adjusting screw 5 is threadedly connected to the bypass valve body 2, and a return spring 7 is provided between the end of the adjusting screw 5 and the valve core 9.

[0020] When the system oil pressure is greater than the set opening pressure, the pressure acts on the front of the valve core 9 and overcomes the elastic force of the return spring 7, causing the valve core 9 to move axially to the open position, forming a bypass channel; when the pressure decreases, the elastic preload of the return spring 7 causes the valve core 9 to reset and close the valve port; by rotating the adjusting screw 5, its axial displacement can be changed, thereby adjusting the compression of the return spring 7, so as to realize the adjustable opening pressure of the valve core 9; the differential pressure valve block 1 is provided with an inlet oil passage 3 and an outlet oil passage 10. When the valve core 9 is in the open state, the inlet oil passage 3 and the outlet oil passage 10 are connected to realize the bypass flow of oil.

[0021] In a preferred embodiment, the bypass valve body 2 is provided with a valve core end hole 12 at its end, which is connected to the inlet oil passage 3. The valve core 9 is in contact with the valve core end hole 12 under the action of the return spring 7 to seal, so as to ensure the closed state of the system during normal operation. The bypass valve body 2 is provided with a side through hole 13 in the circumferential direction. When the valve core 9 moves backward under the action of pressure difference, the side through hole 13 is connected to the outlet oil passage 10, thereby forming a bypass passage, so as to realize that the oil flows directly from the inlet oil passage 3 to the outlet oil passage 10.

[0022] Furthermore, the differential pressure valve block 1 is provided with an inlet 14 and an outlet 11 on its side. The inlet 14 is connected to the inlet oil circuit 3, and the outlet 11 is connected to the outlet oil circuit 10. The inlet 14 and the outlet 11 are respectively connected to the inlet and outlet of the oil purifier. This structure allows the differential pressure valve block 1 to be directly embedded in the oil circuit system of the oil purifier, reducing external connecting parts and improving the overall compactness and ease of installation.

[0023] To achieve precise adjustment of the opening pressure, an adjusting nut 6 is provided on the adjusting screw 5. The operator can adjust the position of the adjusting screw 5 by rotating the adjusting nut 6, thereby changing the preload of the return spring 7. A sealing ring is provided at the connection between the adjusting screw 5 and the bypass valve body 2 to prevent oil leakage and ensure the sealing performance of the oil circuit inside the valve body.

[0024] To achieve intelligent monitoring of the system, pressure tapping holes 4 are respectively installed on the inlet oil line 3 and outlet oil line 10 of the differential pressure valve block 1. The pressure tapping holes 4 are connected to the differential pressure sensor 15 to sense the pressure difference between the inlet and outlet of the oil line. The differential pressure sensor 15 can be a differential pressure electrical sensor or a differential pressure switch. When the system differential pressure reaches the set threshold, it outputs an electrical signal, an audible and visual alarm signal, or a communication signal to remind the operator of filter element blockage or system abnormality. When the system pressure is too high, the valve core 9 automatically opens the bypass channel under the action of the differential pressure, allowing the oil to flow directly around the filter element to prevent the system from operating under overpressure. When the pressure returns to normal, the valve core 9 closes again under the action of the return spring 7 to achieve cyclic protection.

[0025] In another embodiment, the differential pressure valve block 1 and the bypass valve body 2 adopt a modular structure design, and a sealing ring is provided between them. The modular design facilitates disassembly and independent replacement, allowing the bypass valve assembly to be maintained or replaced independently without affecting the filter element and the main oil circuit, thereby reducing maintenance costs and improving system reliability.

[0026] In different applications, the return spring 7 can be selected with different stiffness or materials according to the system pressure range; the valve core 9 can be made of wear-resistant stainless steel or surface-hardened material to enhance service life; the adjusting screw 5 and adjusting nut 6 can be designed as external hexagon or internal hexagon structure according to the operating space to facilitate quick on-site adjustment; the differential pressure sensor 15 can also be selected with different output forms according to the degree of system automation, such as analog voltage signal, digital communication interface or wireless signal output, to achieve compatibility and integration with the control system.

[0027] In summary, this differential pressure sensing bypass valve for the oil purifier integrates differential pressure detection, mechanical bypass, and pressure regulation functions into one unit, realizing automatic bypass control and real-time differential pressure monitoring of the oil purification system. It has comprehensive advantages such as compact structure, sensitive response, strong sealing, convenient adjustment, and modular maintenance, and can effectively improve the operational safety and intelligence level of the oil purifier system.

[0028] During operation: When the system is running, the oil enters the inlet oil passage 3 inside the differential pressure valve block 1 from the inlet 14, and after being filtered by the oil purifier filter element, it flows out from the outlet 11 through the outlet oil passage 10, forming a normal oil circulation. At this time, the valve core 9 is sealed and fitted with the valve core end hole 12 under the elastic force of the return spring 7, the side through hole 13 is closed, the inlet oil passage 3 and the outlet oil passage 10 are not connected, and the bypass oil passage is in a closed state. The differential pressure sensor 15 detects the inlet and outlet pressure difference in real time through the pressure tapping hole 4. When the system is running smoothly, the differential pressure signal is within the normal range.

[0029] When the filter element gradually becomes clogged or the oil viscosity increases, causing the system resistance to increase, the pressure difference between the inlet oil line 3 and the outlet oil line 10 increases accordingly. At this time, the differential pressure sensor 15 detects that the pressure difference exceeds the set value and sends an electrical signal or an audible and visual alarm signal to remind the operator that the filter element needs to be replaced or that there is an abnormality in the system. At the same time, the oil pressure acts on the front of the valve core 9, pushing the valve core to move backward against the elastic force of the return spring 7, so that the valve core end hole 12 opens and connects with the side through hole 13, thereby forming a bypass channel. The oil can then flow directly from the inlet oil line 3 into the outlet oil line 10 through the valve core channel, realizing bypass flow around the filter element and avoiding damage to the system due to excessive pressure.

[0030] When the filter element is cleaned, replaced, or the system resistance decreases, the oil flow returns to normal, the system differential pressure drops below the set value, and the valve core 9 returns to its original position under the elastic force of the return spring 7, re-sealing and fitting with the valve core end hole 12, thus closing the bypass channel. At this time, the oil passes through the filter element again for regular filtration, and the differential pressure sensor 15 continues to monitor the changes in system differential pressure in real time, ensuring that the oil purifier operates stably within a safe range. Through the above process, this utility model realizes closed-loop control of "differential pressure detection - automatic alarm - bypass opening - automatic reset", which has both intelligent monitoring and mechanical protection functions, significantly improving the reliability and safety of the oil purification system.

[0031] The innovation of this utility model lies in: modularly integrating differential pressure sensing and adjustable bypass structure into the same differential pressure valve block 1, forming an integrated differential pressure detection and bypass control system; by setting an inlet oil passage 3, an outlet oil passage 10, and a pressure-applying orifice 4 within the differential pressure valve block 1, real-time detection of system differential pressure is achieved; a plunger-type valve core 9, a return spring 7, and an adjusting screw 5 are installed inside the bypass valve body 2, allowing adjustment of the preload of the return spring 7 according to different oil purifier operating conditions, thereby precisely setting the bypass opening pressure; when the system differential pressure rises to a set threshold, the valve... Under the action of oil pressure, the core 9 overcomes the return spring 7 and moves backward, so that the valve core end hole 12 is connected with the side through hole 13 to form a bypass channel, realizing the bypass flow of oil from the inlet oil line 3 to the outlet oil line 10; at the same time, the differential pressure sensor 15 detects the differential pressure change and outputs an electrical signal or an audible and visual alarm signal to realize the coordinated protection of mechanical bypass and electrical alarm; this design is not only compact in structure and convenient to install and maintain, but also overcomes the shortcomings of the existing filter element built-in bypass valve, which is inconvenient to replace and has no differential pressure signal feedback, significantly improving the safety, intelligence and versatility of the oil purifier system.

[0032] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A differential pressure sensing bypass valve for an oil purifier, comprising a differential pressure valve block (1), a bypass valve body (2), a valve core (9), a differential pressure sensor (15), and an adjusting screw (5), characterized in that: The bypass valve body (2) is connected to the differential pressure valve block (1) by a thread. The valve core (9) is set in the regulating valve chamber (8) inside the bypass valve body (2). The valve core (9) has a plunger structure. The sealing cone surface at its front end forms a sealing fit with the bypass valve body (2). The regulating screw (5) is threadedly connected to the bypass valve body (2). A return spring (7) is set between the end of the regulating screw (5) and the valve core (9). The differential pressure valve block (1) is provided with an inlet oil passage (3) and an outlet oil passage (10). Pressure tapping holes (4) are respectively set on the inlet oil passage (3) and the outlet oil passage (10). The pressure tapping holes (4) are respectively connected to the differential pressure sensor (15).

2. The differential pressure sensing bypass valve for an oil purifier according to claim 1, characterized in that: The bypass valve body (2) is provided with a valve core end hole (12) at the end. The valve core end hole (12) is connected to the inlet oil passage (3). Under the action of the return spring (7), the valve core (9) is in contact with the valve core end hole (12) and sealed. The bypass valve body (2) is provided with a side through hole (13) in the circumferential direction. When the valve core (9) is in the open state, the side through hole (13) is connected to the outlet oil passage (10).

3. The differential pressure sensing bypass valve for an oil purifier according to claim 1, characterized in that: The differential pressure valve block (1) has an outlet (11) and an inlet (14) on its side. The inlet (14) corresponds to the inlet oil circuit (3), and the outlet (11) corresponds to the outlet oil circuit (10). The inlet (14) and the outlet (11) are respectively connected to the inlet and outlet of the oil purifier.

4. The differential pressure sensing bypass valve for an oil purifier according to claim 1, characterized in that: An adjusting nut (6) is provided on the adjusting screw (5), and the adjusting screw (5) can be rotated by adjusting nut (6) to make operation convenient.

5. A differential pressure sensing bypass valve for an oil purifier according to claim 1, characterized in that: The differential pressure sensor (15) is a differential pressure electrical sensor or differential pressure switch, which can output electrical signals, audible and visual alarm signals or communication signals with the control system.

6. The differential pressure sensing bypass valve for an oil purifier according to claim 1, characterized in that: The differential pressure valve block (1) and the bypass valve body (2) adopt a modular structure design, and a sealing ring is provided between the differential pressure valve block (1) and the bypass valve body (2).

Images