A filter plate of a vertical filter press for dehydration using negative pressure

Abstract

The utility model belongs to the technical field of vertical filter presses, and specifically discloses a filter plate of a vertical filter press that utilizes negative pressure for dehydration. A filtrate guide plate is arranged on the top of the filter plate, and a guide groove is provided on the filtrate guide plate; the filtrate channel provided on the filtrate guide plate is connected with the guide groove; a filter plate support plate is arranged below the filtrate guide plate, and a water inlet channel and a water return channel are provided on the filter plate support plate; a filter frame is arranged below the filter plate support plate, and a diaphragm is arranged between the filter frame and the filter plate support plate; an extrusion cavity is formed between the filter plate support plate and the diaphragm, and the water inlet channel and the water return channel are both connected with the extrusion cavity; a feed cavity is formed between the diaphragm and the filter frame, and a feed channel is provided on the filter frame, and the feed channel is connected with the feed cavity. The filter plate of the utility model adopts a vacuuming method to realize low-temperature boiling of the liquid on the basis of the traditional dehydration method of rubber diaphragm extrusion and air drying, and at the same time adopts heating measures to make the gasification effect of the liquid more rapid and obvious.

Description

Technical Field

[0001] The utility model relates to the technical field of vertical filter presses, in particular to a filter plate of a vertical filter press which utilizes negative pressure for dehydration. Background Art

[0002] The filter plate is a key component of the vertical filter press for reducing the liquid content in the filter cake. Currently, there are two main measures to reduce the liquid content in the filter cake: one is to deliver high-pressure water or compressed air to the filter plate extrusion cavity, and squeeze the filter cake by squeezing the rubber diaphragm to achieve the purpose of squeezing out the liquid in the filter cake; the other is to use compressed gas for air drying, and input the compressed gas into the feed cavity through a pipeline, so that the compressed gas blows out the liquid in the filter cake, thereby achieving the purpose of reducing the liquid content in the filter cake.

[0003] However, in current production practice, the dehydration effect of the filter cake is often proportional to the extrusion force and the air drying pressure. Therefore, when dealing with slurry that is difficult to dehydrate, the equipment needs to provide a larger extrusion force and air drying pressure to effectively compress the volume of the filter cake and allow the liquid in the filter cake to escape. In order to achieve a larger extrusion force, the requirements for the equipment will become more stringent, the cost will continue to increase, the economic efficiency will continue to decline, and the mechanical properties of the rubber diaphragm cannot meet the use conditions of a larger "extrusion force".

[0004] To this end, the utility model proposes a vertical filter press filter plate which utilizes negative pressure to perform dehydration. Utility Model Content

[0005] The utility model aims to provide a vertical filter press filter plate which utilizes negative pressure for dehydration, and the filter press filter plate can complete the dehydration work of slurry and effectively reduce the liquid content in the filter cake.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A filter plate of a vertical filter press for dehydration using negative pressure, comprising a filter plate;

[0008] A filtrate guide plate is arranged on the top of the filter plate, and a plurality of guide grooves are provided on the filtrate guide plate; a filtrate channel is provided on one side of the filtrate guide plate, and the filtrate channel is connected with the guide groove;

[0009] A filter plate support plate is arranged below the filtrate guide plate, a water inlet channel is provided on one side of the filter plate support plate, and a water return channel is provided on the other side of the filter plate support plate; a filter frame is arranged below the filter plate support plate, and a diaphragm is arranged between the filter frame and the filter plate support plate; an extrusion cavity is formed between the filter plate support plate and the diaphragm, and the water inlet channel and the water return channel are both connected to the extrusion cavity; a feed cavity is formed between the diaphragm and the filter frame, and a feed channel is provided on the filter frame, and the feed channel is connected to the feed cavity.

[0010] Preferably, the horizontal length of the diaphragm is greater than the horizontal length of the feeding cavity.

[0011] Preferably, the plurality of guide grooves are interconnected.

[0012] Preferably, an annular groove is provided on the bottom surface of the filter frame, and a sealing ring is arranged in the annular groove.

[0013] Preferably, the filtrate guide plate and the filter plate support plate are connected by bolts, and the filter plate support plate and the filter frame are connected by bolts.

[0014] Preferably, the diaphragm is made of rubber.

[0015] Preferably, a filter cloth is arranged below the feeding cavity, and the horizontal length of the filter cloth is greater than the horizontal length of the feeding cavity.

[0016] The beneficial effects of the utility model are as follows:

[0017] The utility model proposes a vertical filter press filter plate that utilizes negative pressure for dehydration. The high-pressure water input by an external water pump is sent into the extrusion chamber along the water inlet channel, and the rubber diaphragm is bent and moved downward under pressure. During the bending and moving process, the volume of the filter cake in the feed chamber is continuously compressed, and the liquid in the filter cake is squeezed out; by sending compressed gas from the feed channel into the feed chamber, the high-pressure and high-speed airflow will take away a certain amount of liquid in the filter cake, so that the liquid content in the filter cake is further reduced; by connecting the filtrate channel to the vacuum system, a negative pressure is formed in the feed chamber, which promotes the boiling point of the liquid in the filter cake to be reduced, so that the liquid can boil and evaporate at low temperature, and the liquid content in the filter cake is reduced; circulating hot water is input into the extrusion chamber from the water inlet channel, and after heat exchange, it is discharged from the return water channel, so that the filter cake temperature is higher than the boiling point, the evaporation of the liquid is accelerated, and the gasification effect of the liquid is more rapid and obvious. The liquid in the filter cake is separated by multiple methods, which not only meets the dehydration process requirements of most types of slurries, but also relatively controls the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0019] Figure 2The structure of the utility model is shown in FIG. Figure 2 ;

[0020] Figure 3 The structure of the utility model in use is shown in FIG. Figure 1 ;

[0021] Figure 4 The structure of the utility model in use is shown in FIG. Figure 2 ;

[0022] Among them, 11-filtrate guide plate, 111-guide groove, 112-filtrate channel;

[0023] 12-filter plate support plate, 121-water inlet channel, 122-water return channel;

[0024] 13-filter frame, 131-feeding channel, 132-sealing ring;

[0025] 14-diaphragm;

[0026] 15- filter cloth;

[0027] 21-feeding chamber, 22-extrusion chamber. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Combination Figures 1 to 4 As shown, the utility model proposes a vertical filter press filter plate that uses negative pressure for dehydration, which mainly includes a filter plate, a filtrate guide plate 11, a filter plate support plate 12, and a filter frame 13. The filtrate guide plate 11, the filter plate support plate 12, and the filter frame 13 are arranged in sequence from top to bottom. The filter press filter plate can separate the liquid in the slurry, effectively reduce the liquid content in the filter cake, and make the liquid content in the filter cake meet the dehydration process requirements.

[0031] Combination Figure 1As shown, a filtrate guide plate 11 is arranged on the top of the filter plate, and a plurality of guide grooves 111 are opened on the filtrate guide plate 11, wherein the plurality of guide grooves 111 are interconnected, which can effectively improve the discharge speed of the filtrate. If a certain guide groove 111 is blocked, the other guide grooves 111 are still connected, which will not affect the filtrate discharge effect, thereby ensuring the smooth progress of the dehydration process.

[0032] Combination Figure 1 and Figure 3 As shown, a filtrate channel 112 is provided on one side of the filtrate guide plate 11 , and the filtrate channel 112 is connected to the guide groove 111 , so that the filtrate separated from the slurry can be discharged from the filter plate through the filtrate channel 112 .

[0033] Combination Figure 1 As shown, a filter plate support plate 12 is arranged below the filtrate guide plate 11, which can enhance the rigidity of the filter plate. A water inlet channel 121 is provided on one side of the filter plate support plate 12, and a water return channel 122 is provided on the other side of the filter plate support plate 12. External high-pressure water flow or hot water can enter the extrusion chamber 22 through the water inlet channel 121. At the same time, the impact force of the high-pressure water flow input by the external water pump is relatively large. The filter plate support plate 12 is arranged between the filtrate guide plate 11 and the filter frame 13, which can provide stable support for the filter plate.

[0034] Combination Figure 2 and Figure 4 As shown, a filter frame 13 is provided below the filter plate support plate 12, and the middle position of the filter frame 13 is open. A rubber diaphragm 14 is provided between the filter frame 13 and the filter plate support plate 12. The diaphragm 14 can play a sealing role to prevent the slurry from overflowing from the gap between the filter plate support plate 12 and the filter frame 13, and the diaphragm 14 can bend downward elastically under external pressure and return to its original position when no force is applied. Figures 2 to 4 As shown, when the diaphragm 14 bends downward, an extrusion cavity 22 is formed between the filter plate support plate 12 and the diaphragm 14, and the water inlet channel 121 and the water return channel 122 are both connected to the extrusion cavity 22. When high-pressure water input by an external water pump enters the extrusion cavity 22 through the water inlet channel 121, the diaphragm 14 bends downward under pressure to squeeze the feed cavity 21 below.

[0035] Combination Figures 1 to 4 As shown, a feed cavity 21 is formed between the diaphragm 14 and the filter frame 13. A feed channel 131 is provided on the filter frame 13. The feed channel 131 is connected to the feed cavity 21. External slurry is input into the feed cavity 21 of the filter plate through a pump.

[0036] Combination Figure 3 and Figure 4As shown, in actual use, at least two filter plates (upper filter plate and lower filter plate) described in the utility model are required, and the two filter plates are arranged in parallel up and down, and a filter cloth 13 is arranged below the feed cavity 21 of the upper filter plate, and the filter cloth 13 is located between the upper and lower filter plates. The slurry delivered by the external feed pump is delivered to the feed cavity 21 through the feed channel 131, and the solid matter in the slurry is intercepted by the filter cloth 15 to its upper surface and gradually forms a filter cake, and the filtrate flows into the lower guide groove 111 through the filter cloth 15, and is finally discharged through the filtrate channel 112.

[0037] Combination Figure 1 and Figure 3 As shown, an annular groove is provided on the bottom surface of the filter frame 13, and a sealing ring 132 is arranged in the annular groove to prevent the filtrate from flowing out from the gap between the upper and lower filter plates, thereby ensuring good sealing during the dehydration process.

[0038] Combination Figures 1 to 4 As shown, the horizontal length of the diaphragm 14 is greater than the horizontal length of the feed cavity 21, which can prevent the slurry from flowing out of the gap and ensure good sealing. The horizontal length of the filter cloth 15 is greater than the horizontal length of the feed cavity 21, which prevents the slurry and filtrate from overflowing and ensures that the slurry dehydration process proceeds smoothly.

[0039] Combination Figures 1 to 4 As shown, the filtrate guide plate 11 and the filter plate support plate 12 are connected by bolts, and the filter plate support plate 12 and the filter frame 13 are connected by bolts, and the three form a rigid overall structure, which can improve the stability during the dehydration process.

[0040] The working principle and dehydration process of the filter plate of the utility model filter press are as follows:

[0041] First, it should be noted that in this embodiment, two filter plates (upper filter plate, lower filter plate) and filter cloth 13 are used for explanation. Figure 3 , Figure 4 As shown. The upper filter plate and the lower filter plate are placed in parallel, and the filter cloth 15 is placed between the upper filter plate and the lower filter plate. The upper and lower filter plates are pressed by a tightening device so that the sealing ring 132 reaches a suitable compression amount to prevent the slurry and filtrate from overflowing. The tightening device includes but is not limited to a hydraulic cylinder.

[0042] The slurry delivered by the external feed pump is delivered to the feed chamber 21 through the feed channel 131, and the solid matter in the slurry is retained by the filter cloth 15 on its upper surface and gradually forms a filter cake; as the aforementioned feeding time continues, the filter cake formed on the upper surface of the filter cloth 15 will gradually increase. When the thickness or weight of the filter cake reaches the requirement, the feeding process stops. At this time, the liquid content in the filter cake is high and does not meet the process requirements;

[0043] Combination Figure 4 As shown, the high-pressure water input by the external water pump enters the extrusion chamber 22 along the water inlet channel 121. At this time, the water return channel 122 is in a closed state. As the high-pressure water is continuously delivered to the extrusion chamber 22, the rubber diaphragm 4 elastically bends downward, and during the downward bending movement, the volume of the filter cake in the feed chamber 21 is continuously compressed, and the liquid in the filter cake is squeezed out. At this time, the liquid content in the filter cake is high, which does not meet the process requirements.

[0044] Combination Figure 3 As shown, in order to further reduce the liquid content in the filter cake, compressed gas is sent into the feed channel 131, and the high-pressure and high-speed airflow will take away a certain amount of liquid, so that the liquid content in the filter cake is further reduced; in the above-mentioned air drying process, since the return water channel 122 is closed, the water in the extrusion chamber 22 will flow back to the water tank along the water inlet channel 121, and the rubber diaphragm 4 will be reset upward.

[0045] Combination Figure 4 As shown, in order to further reduce the liquid content after air drying, the filtrate channel 112 is connected to a vacuum system (not shown in the figure), so that a negative pressure is formed in the feed chamber 21, which causes the boiling point of the liquid in the filter cake to decrease, so that the liquid can boil and evaporate at a low temperature, thereby reducing the liquid content in the filter cake; in order to accelerate the evaporation of the liquid, circulating hot water is sent into the extrusion chamber 22 through the water inlet channel 121, and after heat exchange, it is discharged through the return water channel 122. This process makes the filter cake temperature higher than the boiling point, thereby accelerating the evaporation of the liquid.

[0046] The vaporized water discharged under vacuum negative pressure is extracted by a vacuum pump, and then separated by gas and liquid through a condenser, thereby reducing the liquid content of the filter cake. When the liquid content in the filter cake meets the process requirements, the thrust of the hydraulic cylinder is released, the upper filter plate is separated from the lower filter plate, and a suitable gap is left between the two, and the filter cake is discharged. The filter cake discharged from the feed chamber 21 will fall on the filter cloth 15, and the filter cake will be transported to the silo through the filter cloth transmission device (not shown in the figure).

[0047] Combination Figures 1 to 4As shown, the utility model proposes a filter plate of a vertical filter press that uses negative pressure for dehydration. The high-pressure water input by an external water pump is sent into the extrusion chamber 22 along the water inlet channel 121. The diaphragm 14 is elastically bent downward under pressure, and the volume of the filter cake in the feed chamber 21 is continuously compressed during the bending movement, and the liquid in the filter cake is squeezed out; the compressed gas is sent into the feed chamber 21 from the feed channel 131, and the high-pressure and high-speed airflow will take away a certain amount of liquid in the filter cake, so that the liquid content in the filter cake is further reduced; the filtrate channel 112 is connected to the vacuum system, so that the feed chamber 21 forms a negative pressure, which promotes the boiling point of the liquid in the filter cake to decrease, so that the liquid can boil and evaporate at low temperature, and effectively reduce the liquid content in the filter cake; the circulating hot water is then input into the extrusion chamber 22 from the water inlet channel 121, and after heat exchange, it is discharged from the return water channel 122, so that the filter cake temperature is higher than the boiling point, the boiling and evaporation speed of the liquid are accelerated, and the gasification effect of the liquid is more rapid and obvious, thereby improving the dehydration efficiency. The utility model separates the liquid in the filter cake in a variety of ways, which not only meets the dehydration process requirements of most types of slurries, but also does not need to increase the pressure of "extruding high-pressure water or compressed air", and will not exceed the limit of the mechanical properties of the rubber diaphragm 14, thereby extending the service life of the diaphragm 14 and relatively reducing costs.

[0048] Of course, the above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model and should be protected by the utility model.

Claims

1. A filter plate of a vertical filter press for dehydration using negative pressure, characterized in that: Including filter plate; A filtrate guide plate is arranged on the top of the filter plate, and a plurality of guide grooves are provided on the filtrate guide plate; a filtrate channel is provided on one side of the filtrate guide plate, and the filtrate channel is connected with the guide groove; A filter plate support plate is arranged below the filtrate guide plate, a water inlet channel is arranged on one side of the filter plate support plate, and a water return channel is arranged on the other side of the filter plate support plate; A filter frame is arranged below the filter plate support plate, and a diaphragm is arranged between the filter frame and the filter plate support plate; An extrusion cavity is formed between the filter plate support plate and the diaphragm, and the water inlet channel and the water return channel are both connected to the extrusion cavity; A feeding cavity is formed between the diaphragm and the filter frame. The filter frame is provided with a feeding channel, and the feeding channel is communicated with the feeding cavity.

2. A filter plate of a vertical filter press for dehydration using negative pressure according to claim 1, characterized in that: The horizontal length of the diaphragm is greater than the horizontal length of the feeding cavity.

3. The filter plate of a vertical filter press for dehydration using negative pressure according to claim 1, characterized in that: The plurality of guide grooves are interconnected.

4. The filter plate of a vertical filter press for dehydration using negative pressure according to claim 1, characterized in that: An annular groove is formed on the bottom surface of the filter frame, and a sealing ring is arranged in the annular groove.

5. The filter plate of a vertical filter press for dehydration using negative pressure according to claim 1, characterized in that: The filtrate guide plate and the filter plate support plate are connected by bolts, and the filter plate support plate and the filter frame are connected by bolts.

6. The filter plate of a vertical filter press for dehydration using negative pressure according to claim 1, characterized in that: The diaphragm is made of rubber.

7. The filter plate of a vertical filter press for dehydration using negative pressure according to claim 1, characterized in that: A filter cloth is arranged below the feeding cavity, and the horizontal length of the filter cloth is greater than the horizontal length of the feeding cavity.

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