Diaphragm filter press with graded pressure relief control

Abstract

The utility model discloses a staged pressure relief control diaphragm filter press which comprises a main machine, a diaphragm filter plate of the main machine is connected with a squeezing pipeline, the squeezing pipeline is provided with a pressurizing device, the side end of the pressurizing device is provided with a first control valve and at least one low-pressure regulating valve which are connected to the squeezing pipeline, and the squeezing pipeline is connected with a high-pressure regulating valve in parallel. An emptying valve is connected to the squeezing pipeline in parallel, and a pressure monitoring device is installed on the squeezing pipeline. By adopting the mode, the real-time pressure of the squeezing pipeline of the filter press can be subjected to hierarchical control according to requirements, so that when the filter cake is required to be dehydrated, high-pressure squeezing is performed, and when the filter cake is required to be washed, the squeezing pressure is released to lower pressure, the filter cake structure is relatively loose, and the occurrence of a short-circuit area caused by the looseness of the filter cake is prevented; in addition, by adopting the mode, the filter cake subjected to blowing operation can be kept loose, the cross-flow resistance is reduced, the operation time and the energy consumption are greatly reduced, and the device is worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to a filtering device, in particular to a diaphragm filter press, and more particularly to a diaphragm filter press with stepped pressure relief control. Background Art

[0002] A diaphragm filter press usually consists of a set of filter plates and pressing plates combined; all the filter plates and pressing plates of the diaphragm filter press are tightly pressed together to form a filter chamber between adjacent filter plates and pressing plates. When the material to be filtered fills the filter chamber, high-pressure air is blown into the pressing plate or high-pressure water is introduced to agitate the elastic pressing membrane to deform, so as to squeeze the filter cake (i.e., the material to be filtered in the filter chamber), and squeeze out the excess water in the filter cake to make the filter cake meet the requirement of a lower moisture content.

[0003] At present, when the pressing operation of the material is completed, the pressure is released completely at one time. By using this method, during the pressing operation of the filter cake, since the filter cake is compressed, the volume of the filter cake will shrink. If the pressure is released at one time, it will cause the filter cake to sink or crack. In the subsequent filter cake washing or blowing (the main purpose of filter cake washing is to recycle the soluble substances in the filter cake) operation, multiple short circuits will occur (that is, the washing liquid or air will flow away from the gaps where the filter cake sinks or cracks, thus affecting the recovery effect; the purpose of blowing is to reduce the moisture content of the filter cake), and the effects of filter cake washing or blowing will be greatly reduced.

[0004] In summary, the current pressing method of releasing pressure at one time can no longer meet the best use requirements of the diaphragm filter press. Summary of the Utility Model

[0005] The utility model aims to solve the above-mentioned disadvantages of the prior art and provides a diaphragm filter press with stepped pressure relief control that can perform stepped pressure relief control after the pressing operation of the filter cake, meeting the requirements that the filter cake will not sink or crack and avoiding short circuits.

[0006] The technical solution adopted by the utility model to solve its technical problems: This diaphragm filter press with hierarchical pressure relief control includes a main machine. A pressing pipeline is connected to the pressing plate of the main machine. A pressurizing device is provided on the pressing pipeline. A first control valve and at least one low-pressure regulating valve connected to the pressing pipeline are provided at the side end of the pressurizing device. A high-pressure regulating valve is connected in parallel on the pressing pipeline, and a vent valve is connected in parallel on the pressing pipeline. The function of the pressurizing device here is to blow high-pressure air or introduce high-pressure water between the pressing membrane and the core plate of the diaphragm filter plate, agitate the elastic pressing membrane to deform, extrude the filter cake, and squeeze out the excess water in the filter cake to make the filter cake meet the requirements of a lower moisture content. The functions of the pressing pipeline, the first control valve, the low-pressure regulating valve, the high-pressure regulating valve, and the vent valve here are to be able to perform hierarchical pressure relief on the filter cake, thereby avoiding the settlement or cracking of the filter cake, and avoiding the occurrence of multiple short circuits during subsequent filter cake washing or blowing operations, which affects the effect of filter cake washing or blowing. The low-pressure regulating valve consists of one or more. When there are multiple low-pressure regulating valves, the set pressure values of the low-pressure regulating valves decrease sequentially along the flow path direction, so as to achieve a better effect of hierarchical pressure relief and pressure reduction.

[0007] Further improvement: A pressure monitoring device is installed on the pressing pipeline. The pressure monitoring device here can monitor the pressure change on the pressing pipeline in real time, so as to facilitate the control of the high-pressure regulating valve, the low-pressure regulating valve, and the vent valve, and thus achieve the purpose of hierarchical pressure relief.

[0008] Further improvement: The pressure monitoring device is a pressure gauge. The function of the pressure gauge here is to be able to intuitively know the pressure change on the pressing pipeline, so as to facilitate subsequent hierarchical pressure relief of the pressing pipeline.

[0009] Further improvement: The pressurizing device includes a pressing water pump. A water tank is provided at the side end of the pressing water pump and is connected to the pressing water pump. A second control valve is installed between the pressing water pump and the pressing pipeline. The outlet ends of the low-pressure regulating valve, the high-pressure regulating valve, and the vent valve are all connected to the water tank. The functions of the pressing water pump, the water tank, and the second control valve here are to be able to use water pressure to press and squeeze the filter cake. The water pressure enters the pressing cavity, so that the pressing membrane bulges and squeezes the flow path membrane, thereby performing a pressing operation on the filter cake. When the water pressure is too high, it will flow back to the water tank through the high-pressure regulating valve. When performing hierarchical pressure relief, the water flow will also flow back to the water tank through the low-pressure regulating valve and the vent valve for reuse.

[0010] Further improvement: A third control valve is installed between the pressing water pump and the water tank. The function of the third control valve here is to play a further safety role. When performing hierarchical pressure relief on the pressing pipeline, the second control valve and the third control valve are synchronously closed to avoid the water pressure flowing back to the water tank due to the failure of the second control valve, thus causing the failure of hierarchical pressure relief, and achieving the purpose of further safe hierarchical pressure relief.

[0011] Further improvement: The pressurizing device includes an air compressor, and a fourth control valve is installed between the air compressor and the pressing pipeline. The functions of the air compressor and the fourth control valve are to use the air pressure generated by the air compressor to press the filter cake. The air pressure enters the pressing chamber, causing the pressing membrane to bulge and squeeze the flow channel membrane, thereby performing a pressing operation on the filter cake. When the air pressure is too high, it will be discharged through the high-pressure regulating valve. When the fourth control valve is closed, it can prevent the air pressure from leaking out through the air compressor during staged pressure relief, and the air pressure can only be discharged in stages through the high-pressure regulating valve, low-pressure regulating valve, and vent valve.

[0012] Further improvement: The pressurizing device includes a high-pressure gas tank, and a fifth control valve is installed between the high-pressure gas tank and the pressing pipeline. The functions of the high-pressure gas tank and the fifth control valve are to use the high-pressure air pressure generated by the high-pressure gas tank to press the filter cake. The air pressure enters the pressing chamber, causing the pressing membrane to bulge and perform a pressing operation on the filter cake. When the air pressure is too high, it will be discharged through the high-pressure regulating valve. When the fifth control valve is closed, it can prevent the air pressure in the high-pressure gas tank from remaining open and failing to achieve the purpose of staged pressure relief during staged pressure relief.

[0013] The utility model can feed back signals to the PLC controller or control device through a pressure monitoring device, and control the operation of the pressing water pump and perform staged pressure relief through programming. The PLC controller in this solution is a general-purpose programmable logic controller on the market, and brands such as Mitsubishi PLC, Schneider PLC, Unitronics of Younikang, Delta PLC, and Panasonic PLC can be selected on the market. In addition, the program setting of this PLC controller is basically the same as the principle of the general setting method on the market, and ordinary technicians can set program instructions according to the processing speed and efficiency requirements, which is convenient and fast.

[0014] The set pressure of the utility model can also be adjusted through debugging to manually control staged pressure relief operations.

[0015] After the utility model feeds back through a pressure gauge, automatic staged control can be achieved through a pressure transmitter.

[0016] The pressing pressure of the utility model can be visually inspected with a pressure gauge and manually operated in stages.

[0017] As shown above, a diaphragm filter press with staged pressure relief control shown in the utility model has a reasonable structure, is convenient to operate, has low resistance for subsequent washing and blowing, has no short circuit, and can greatly improve the dryness of the filter cake and save washing water.

[0018] The beneficial effects of the utility model are:

[0019] 1). It is capable of blowing high-pressure air or introducing high-pressure water between the pressing membrane and the core plate of the diaphragm filter plate, agitating the elastic pressing membrane to deform, squeezing the filter cake, and squeezing out the excess water in the filter cake to make the filter cake meet a lower moisture content;

[0020] 2). When relieving the pressure of the filter cake, it performs stepwise pressure relief to avoid the filter cake from sinking or cracking and affecting subsequent filter cake washing or blowing operations;

[0021] 3). It is capable of monitoring the pressure of the pressing pipeline in real time, so as to perform stepwise pressure relief more accurately and have a better effect of preventing the filter cake from cracking or sinking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the first embodiment of the present utility model;

[0023] Figure 2 It is a schematic structural diagram of the second embodiment of the present utility model;

[0024] Figure 3 It is a schematic structural diagram of the third embodiment of the present utility model;

[0025] Figure 4 It is a schematic cross-sectional structural diagram of the main machine part of the present utility model.

[0026] Description of the reference numerals: main machine 1, clamping device 1-1, liquid discharge port 1-2, pressing pipeline 2, pressurizing device 3, pressing water pump 3-1, water tank 3-2, second control valve 3-3, third control valve 3-4, first control valve 4, low-pressure regulating valve 5, high-pressure regulating valve 6, vent valve 7, pressure monitoring device 8, pressing plate 9, filter plate 10, filter chamber 11, pressing chamber 12, filter cake 13. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present utility model will be further described below with reference to the drawings:

[0028] Embodiment 1:

[0029] Refer to the attached Figure 1 、 4 : This diaphragm filter press with stepwise pressure relief control includes a main machine 1. A pressing pipeline 2 is connected to the core plate of the main machine 1. A pressurizing device 3 is provided on the pressing pipeline 2. A first control valve 4 and at least one low-pressure regulating valve 5 connected to the pressing pipeline 2 are provided at the side end of the pressurizing device 3. A high-pressure regulating valve 6 is connected in parallel to the pressing pipeline 2, and a vent valve 7 is connected in parallel to the pressing pipeline 2.

[0030] A pressure monitoring device 8 is installed on the pressing pipeline 2.

[0031] The pressure monitoring device 8 is a pressure gauge.

[0032] The pressurizing device 3 includes a squeezing water pump 3-1. A water tank 3-2 is provided at the side end of the squeezing water pump 3-1 and is connected to the squeezing water pump 3-1. A second control valve 3-3 is installed between the squeezing water pump 3-1 and the squeezing pipeline 2. The outlet ends of the low-pressure regulating valve 5, the high-pressure regulating valve 6, and the vent valve 7 are all connected to the water tank 3-2.

[0033] A third control valve 3-4 is installed between the squeezing water pump 3-1 and the water tank 3-2.

[0034] The utility model can feed back signals to the PLC controller or the control device through the pressure monitoring device 8, and control the operation of the squeezing water pump 3-1 and subsequent staged pressure relief through a program.

[0035] The set pressure of the utility model can also be adjusted through debugging to manually control staged pressure relief operations.

[0036] After the utility model is feedback by a pressure gauge, automatic staged control can be achieved through a pressure transmitter.

[0037] The squeezing pressure of the utility model can be visually observed by a pressure gauge and manually operated in stages.

[0038] The working principle of the utility model: As Figure 4 shown, when in use, the material enters the filter chamber 11 for filtration. The filtrate will pass through the filter plate 10 and be discharged from the drain port 1-2. In order to make the moisture content of the filter cake 13 lower, the squeezing water pump 3-1 is turned on. High-pressure water enters the squeezing chamber 12 through the squeezing pipeline 3-1, agitating the squeezing membrane made of rubber material to squeeze the filter cake 13 in the filter chamber 11, so that the filter cake 13 is extruded of the excess filtrate, thereby reducing the moisture content of the filter cake 13. After the squeezing is completed, then separate each squeezing plate 9 and filter plate 10, and the squeezed filter cake 13 can fall by its own gravity.

[0039] During the diaphragm squeezing operation of the filter press 1, the first control valve 4 is closed. When the squeezing pressure reaches the set value of the high-pressure regulating valve 6 for squeezing, when the squeezing is completed and pressure relief is carried out, first open the first control valve 4, and the squeezing pressure of the filter press 1 will be relieved to the pressure value set by the low-pressure regulating valve 5. Immediately afterwards, filter cake washing or blowing operations can be carried out through the drain port 1-2 to collect useful water-soluble substances in the filter cake. When all operations are completed, open the vent valve 11, and the pressure in the squeezing chamber 12 is relieved to zero. The clamping device 1-1 is opened and reset, and the filter plates 10 and squeezing plates 10 are separated one by one through a separating device (not shown in the figure) to carry out unloading. The complete pressure relief of the filter press can be achieved by another bypass pipe valve to relieve the pressure to zero.

[0040] The structure of the utility model is reasonable, easy to operate, with small resistance for washing and blowing, saving washing water, and the filter cake being drier, which can significantly improve the subsequent washing and blowing effects on the filter cake; meanwhile, by adopting the method of hierarchical control of the pressing pressure for pressure relief, the inherent operation mode is changed, filling the technical gap and achieving unexpected effects.

[0041] Embodiment 2:

[0042] Refer to the appendix Figure 2 、 4 : This diaphragm filter press with hierarchical pressure relief control includes a main machine 1, a pressing pipeline 2 is connected to the filter plate of the main machine 1, and a pressurizing device 3 is provided on the pressing pipeline 2. Its characteristics are that a first control valve 4 and at least one low-pressure regulating valve 5 connected to the pressing pipeline 2 are provided at the side end of the pressurizing device 3, a high-pressure regulating valve 6 is connected in parallel on the pressing pipeline 2, and a vent valve 7 is connected in parallel on the pressing pipeline 2.

[0043] A pressure monitoring device 8 is installed on the pressing pipeline 2.

[0044] The pressure monitoring device 8 is a pressure gauge.

[0045] The pressurizing device 3 includes an air compressor 3-5, and a fourth control valve 3-6 is installed between the air compressor 3-5 and the pressing pipeline 2.

[0046] The working principle of the utility model: The working principle of Embodiment 2 is basically the same as that of Embodiment 1. The only difference is that high-pressure air is filled into the pressing cavity 12 at the pressing plate 9 through high-pressure air to squeeze the filter cake and reduce the moisture content of the filter cake.

[0047] Embodiment 3:

[0048] Refer to the appendix Figure 3 、 4 : This diaphragm filter press with hierarchical pressure relief control includes a main machine 1, a pressing pipeline 2 is connected to the filter plate of the main machine 1, and a pressurizing device 3 is provided on the pressing pipeline 2. Its characteristics are that a first control valve 4 and at least one low-pressure regulating valve 5 connected to the pressing pipeline 2 are provided at the side end of the pressurizing device 3, a high-pressure regulating valve 6 is connected in parallel on the pressing pipeline 2, and a vent valve 7 is connected in parallel on the pressing pipeline 2.

[0049] A pressure monitoring device 8 is installed on the pressing pipeline 2.

[0050] The pressure monitoring device 8 is a pressure gauge.

[0051] The pressurizing device 3 includes a high-pressure gas tank 3-7, and a fifth control valve 3-8 is installed between the high-pressure gas tank 3-7 and the pressing pipeline 2.

[0052] Working principle of the utility model: The working principle of Embodiment 3 is basically the same as that of Embodiment 1. The only difference is that high-pressure gas is filled into the pressing cavity 12 at the pressing plate 9 through high-pressure gas, so as to squeeze the filter cake and reduce the moisture content of the filter cake.

[0053] Although the present utility model has been illustrated and described by referring to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details may be made within the scope of the claims.

Claims

1. A diaphragm filter press with graded pressure relief control, comprising a main machine (1), the main machine (1) being connected to a pressing pipeline (2), the pressing pipeline (2) being provided with a pressurizing device (3), wherein: The side end of the boosting device (3) is provided with a first control valve (4) connected to the squeezing pipeline (2) and at least one low-pressure regulating valve (5), the squeezing pipeline (2) is connected in parallel with a high-pressure regulating valve (6), and the squeezing pipeline (2) is connected in parallel with a vent valve (7).

2. The diaphragm filter press with graded pressure relief control according to claim 1 is characterized in that: A pressure monitoring device (8) is installed on the squeezing pipeline (2).

3. The diaphragm filter press with graded pressure relief control according to claim 2 is characterized in that: The pressure monitoring device (8) is a pressure gauge.

4. The diaphragm filter press with graded pressure relief control according to claim 1 is characterized in that: The boosting device (3) comprises a squeezing water pump (3-1), a side end of the squeezing water pump (3-1) is provided with a water tank (3-2) connected to the squeezing water pump (3-1), a second control valve (3-3) is installed between the squeezing water pump (3-1) and the squeezing pipeline (2), and the outlet ends of the low-pressure regulating valve (5), the high-pressure regulating valve (6), and the vent valve (7) are all connected to the water tank (3-2).

5. The diaphragm filter press with graded pressure relief control according to claim 4 is characterized in that: A third control valve (3-4) is installed between the squeezing water pump (3-1) and the water tank (3-2).

6. The diaphragm filter press with graded pressure relief control according to claim 1, characterized in that: The boosting device (3) comprises an air compressor (3-5), and a fourth control valve (3-6) is installed between the air compressor (3-5) and the squeezing pipeline (2).

7. The diaphragm filter press with graded pressure relief control according to claim 1 is characterized in that: The pressure boosting device (3) comprises a high-pressure gas tank (3-7), and a fifth control valve (3-8) is installed between the high-pressure gas tank (3-7) and the squeezing pipeline (2).

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