Oil level automatic control system for oil box of plate and frame type oil filter

Abstract

The utility model relates to the field of plate frame type oil filters. A plate frame type oil filter oil box oil level automatic control system comprises an oil box 1, a controller 3, a filter 6, a gear pump 7, an oil return valve 5, a manual ball valve 4 and a liquid level meter 2, a filter frame 8 is arranged in the oil box 1, a main oil tank is connected with an inlet of the filter 6 through a pipeline of the manual ball valve 4, an outlet of the filter 6 is connected with an inlet of the filter frame 8 through the gear pump 7, and an outlet of the filter frame 8 is connected with the main oil tank. The oil box 1 is connected with an inlet of the filter 6 through a pipeline of the oil return valve 5, the controller 3 is in electric signal connection with the gear pump 7, the oil return valve 5 is an electromagnetic control valve, and the oil return valve 5 and the liquid level meter 2 are in electric signal connection with the controller 3.

Description

Technical Field

[0001] This utility model relates to the field of plate and frame oil filters. Background Technology

[0002] A plate and frame oil filter is a mechanical device used to filter solid impurities and moisture from oil, improving its quality. It is widely used due to its low price and high impurity removal efficiency. A plate and frame oil filter consists of a gear pump, filter, return valve, filter bed (including pressure gauge, filter plates, filter frames, filter paper, and oil box), support frame, chassis, coupling, and motor. The oil to be filtered is drawn into the filter's inlet. After larger impurities are removed by the filter, it enters the gear pump, which is driven by the motor via the coupling. This drives the gear pump to rotate, forcing the oil into the filter bed (where filter plates and frames alternately form independent filter chambers, with filter paper sandwiched between them). The filter paper removes impurities from the oil. When the oil level in the oil box rises, the return valve needs to be manually opened. The vacuum effect at the gear pump's inlet draws the remaining oil in the oil box into the filter.

[0003] During the use of the plate oil filter (with the return oil valve in a normally closed state), it is necessary to have a dedicated person to supervise it. When the oil level in the oil box reaches a certain height, the supervisor should open the manual return oil valve in time (the return oil valve in the existing technology is a manual return oil valve). The oil in the oil box will then pass through the return oil valve and the filter to enter the oil pump for recirculation.

[0004] In actual use, due to a shortage of on-site personnel, operators may open the return oil valve to a certain degree based on experience (when the return oil valve is normally open, in order to ensure the normal oil level in the oil box, the manual ball valve of the plate and frame oil filter needs to be throttled, resulting in a smaller oil intake of the oil filter, affecting the oil filtration effect, and the oil filter's operating cycle is correspondingly extended). In this way, the oil seeping between the filter plates of the filter bed will enter the oil pump for recirculation through the return oil valve filter, and the oil level in the oil box will not rise, thus preventing oil overflow. However, if the motor, coupling, or oil pump malfunctions during operation, the oil in the main oil tank of the equipment will flow back into the oil box of the plate and frame oil filter through the return oil valve (the inlet of the plate and frame oil filter requires a certain inlet static pressure, which is generally placed below the main oil tank). If this is not detected in time, it will continuously overflow from the oil box, causing the oil level in the tank to drop continuously. When the oil level drops to the level where the emergency pump cannot work (generally, power generation equipment does not have a high-level oil tank and uses a DC pump as an emergency pump), it will cause the unit's oil pressure protection to trip, or even cause an oil shortage and bearing failure accident. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to prevent the oil in the main oil tank of the equipment from flowing back into the oil box of the plate oil filter through the oil return valve when the motor, coupling or oil pump fails.

[0006] The technical solution adopted in this utility model is: an oil level self-control system for a plate and frame oil filter, including an oil box 1, a controller 3, a filter 6, a gear pump 7, a return valve 5, a manual ball valve 4, and a level gauge 2. The oil box 1 contains a filter frame 8. The main oil tank is connected to the inlet of the filter 6 through the manual ball valve 4. The outlet of the filter 6 is connected to the inlet of the filter frame 8 through the gear pump 7. The outlet of the filter frame 8 is connected to the main oil tank. The oil box 1 is connected to the inlet of the filter 6 through the return valve 5. The controller 3 is electrically connected to the gear pump 7. The return valve 5 is an electromagnetically controlled valve. The return valve 5 and the level gauge 2 are electrically connected to the controller 3.

[0007] The return valve 5 is an electromagnetically controlled one-way valve, which includes an electromagnetic valve 51 and a one-way valve 52. The electromagnetic valve 51 and the one-way valve 52 are installed on the pipeline connecting the oil box 1 and the inlet of the filter 6.

[0008] Level gauge 2 is a float level gauge.

[0009] The beneficial effect of this utility model is that when the motor, coupling or oil pump fails, the return oil valve of this utility model can prevent backflow. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the electromagnetically controlled one-way valve of this utility model;

[0012] Figure 3 This is a schematic diagram of a plate and frame oil filter based on existing technology;

[0013] Among them, 1. oil box, 2. level gauge, 3. controller, 4. manual ball valve, 5. return oil valve, 6. filter, 7. gear pump, 8. filter frame, 51. solenoid valve, 52. check valve. Detailed Implementation

[0014] like Figure 3 As shown, a conventional plate and frame oil filter includes an oil box, a controller, a filter, a gear pump, a return valve, and a manual ball valve. The oil box contains the filter frame. The main oil tank is connected to the filter inlet via the manual ball valve. The filter outlet is connected to the filter frame inlet via the gear pump. The filter frame outlet is connected to the main oil tank. The oil box is connected to the filter inlet via the return valve. The controller is electrically connected to the gear pump. It should be noted that some conventional plate and frame oil filters do not have a controller; instead, they only have a switch to control the gear pump (gear pump motor). The return valve in the conventional technology is a manually controlled regulating valve that can adjust the flow rate.

[0015] The controller is a core component used to manage and regulate equipment operation, and it has wide applications in many fields. Its main functions include coordinating system operation, generating control signals, and executing instruction flows. A plate and frame oil filter without a controller cannot accurately control the gear pump, and therefore cannot adjust the pump oil flow.

[0016] During operation, the plate and frame oil filter consists of a gear pump, filter, return valve, filter bed (including pressure gauge, filter plates, filter frames, filter paper, and oil box), support frame, chassis, coupling, and motor. The oil to be filtered is drawn in through the filter inlet. After larger impurities are removed by the filter, it enters the gear pump. The motor drives the gear pump via the coupling, forcing the oil into the filter bed (where filter plates and frames alternately form independent filtration chambers, with filter paper sandwiched between them). The filter paper removes impurities from the oil. When the oil level in the oil box rises, the return valve needs to be manually opened. The vacuum effect at the gear pump inlet draws the remaining oil in the oil box into the filter.

[0017] Therefore, during the use of the plate oil filter (with the return oil valve in a normally closed state), it is necessary to have a dedicated person to supervise it. When the oil level in the oil box reaches a certain height, the supervisor must open the manual return oil valve in time (the return oil valve in the existing technology is a manual return oil valve). The oil in the oil box passes through the return oil valve and enters the oil pump for recirculation through the filter.

[0018] In actual use, for convenience, operators open the return oil valve to a certain degree based on experience (when the return oil valve is normally open, in order to ensure the normal oil level in the oil box, the manual ball valve of the plate and frame oil filter needs to be throttled, resulting in a smaller oil intake of the oil filter, affecting the oil filtration effect, and the oil filter's operating cycle is correspondingly extended). In this way, the oil seeping between the filter plates of the filter bed will enter the oil pump for recirculation through the return oil valve filter cleaner, and the oil level in the oil box will not rise, thus preventing oil overflow from the oil box.

[0019] However, if the motor, coupling, or oil pump (any one or more) malfunctions during operation, the oil in the main oil tank will flow back into the oil box of the plate filter through the return valve (the plate filter requires a certain inlet static pressure and is usually placed below the main oil tank). If this is not detected in time, the oil will continuously overflow from the oil box, causing the oil level in the tank to drop continuously. When the oil level drops to the level where the emergency pump cannot work (generally, power generation equipment does not have a high-level oil tank and uses a DC pump as an emergency pump), it will cause the unit's oil pressure protection to trip, and may even lead to an oil shortage and bearing failure accident.

[0020] This utility model was made to solve the above problems.

[0021] This utility model makes improvements based on the existing technology by changing the manual control valve of the return oil valve to an electromagnetic control valve, and adding a level gauge to measure the oil level in the oil box. The electromagnetic control valve and the level gauge are connected to the controller by electrical signals.

[0022] The return valve is an electromagnetically controlled one-way valve, which includes a solenoid valve and a one-way valve. The solenoid valve and the one-way valve are installed on the inlet pipe connecting the oil box and the filter.

[0023] The controller in this invention is a PLC or a standalone microcontroller.

[0024] When a malfunction occurs (motor, coupling, oil pump failure; filter bed clamping screw loosening), even when the oil level in the oil box reaches the maximum level, the float level gauge will still give a high level signal. The controller will open the return oil solenoid valve and close the inlet oil solenoid valve. If the oil level in the oil box does not drop within a certain time (1 minute), the controller will give a signal to stop the oil filter pump. This is to prevent lubricating oil from flowing back into the oil box of the plate filter machine through the return oil valve or the filter bed clamping screw from being out of position, causing a large amount of oil to seep between the filter plates and resulting in oil overflow from the oil box.

[0025] In one embodiment, the return valve is a simple one-way valve. In the event of an accident, the pressure between the oil box and the filter inlet is uncertain and may be very low at times. This can cause the one-way valve to backflow and fail to meet the requirements.

[0026] Electromagnetically controlled check valves can prevent reverse osmosis. Furthermore, in most cases, the check valve itself can prevent backflow, reducing the need for control.

Claims

1. An oil level self-control system for a plate and frame oil filter, comprising an oil box (1), a controller (3), a filter (6), a gear pump (7), a return valve (5), and a manual ball valve (4), wherein the oil box (1) contains a filter frame (8), the main oil tank is connected to the inlet of the filter (6) via the manual ball valve (4), the outlet of the filter (6) is connected to the inlet of the filter frame (8) via the gear pump (7), the outlet of the filter frame (8) is connected to the main oil tank, the oil box (1) is connected to the inlet of the filter (6) via the return valve (5), and the controller (3) is electrically connected to the gear pump (7), characterized in that: It also includes a level gauge (2), and the return valve (5) is an electromagnetically controlled valve. The return valve (5) and the level gauge (2) are electrically connected to the controller (3).

2. The oil level self-control system for the oil box of a plate and frame oil filter according to claim 1, characterized in that: The return valve (5) is an electromagnetically controlled one-way valve, which includes an electromagnetic valve (51) and a one-way valve (52). The electromagnetic valve (51) and the one-way valve (52) are installed on the pipeline connecting the oil box (1) and the filter (6).

3. The oil level self-control system for a plate and frame oil filter according to claim 1, characterized in that: The level gauge (2) is a float level gauge.

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