A low-pressure filter plate and filter press

Abstract

The present invention provides a low-pressure filter plate and a filter press. The low-pressure filter plate includes a liner, a filter cloth and a diaphragm. The two sides of the liner in the thickness direction are a filter side and a press side respectively; the liner is provided with a concave filter cavity, a plurality of bosses arranged at the bottom of the filter cavity, and a filtrate channel formed between the bosses on the filter side, the filter cloth is fixed on the filter side of the liner and covers the filter cavity, and a feed hole and a liquid outlet hole both connected to the filter cavity are provided on the liner; a concave press cavity is provided on the press side of the liner, the diaphragm is fixed on the press side of the liner and covers the press cavity, and a press joint connected to the press cavity is fixedly connected on the liner. The present application configures a plurality of low-pressure filter plates arranged in the same direction in the filter press to realize press filtration without configuring other functional filter plates; in particular, the present application introduces a low-pressure press medium into the press cavity through the press joint, and the diaphragm bulges, thereby further reducing the filtrate content in the filter residue through low-pressure pressing.

Description

Technical Field

[0001] The invention relates to a filtering device, in particular to a low-pressure filtering plate and a filter press equipped with the low-pressure filtering plate. Background Art

[0002] In some industries, materials need to be filtered at low pressure to prevent harmful substances from seeping out and affecting the quality or taste of the final product, such as the extraction of syrup from saccharified mash. In the early days, most manufacturers used filter tanks to filter saccharified mash, but this filtration method has defects such as long filtration cycle, high moisture content of filter residue, and difficulty in improving yield. In recent years, chamber filter plates have gradually been used for filtration of saccharified mash, which can shorten the filtration cycle, but there is not much improvement in the moisture content of the filter residue and the yield; in addition, chamber filter plates need to be arranged at intervals and used together with other functional filter plates. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a low-pressure filter plate that can achieve filtering and pressing, effectively reduce the moisture content of the filter residue and improve the yield.

[0004] To achieve the above-mentioned purpose, the present invention provides a low-pressure filter plate, comprising a liner, a filter cloth and a diaphragm, wherein the liner has a filter side and a press side on both sides in the thickness direction thereof; the liner is provided with a concave filter cavity, a plurality of bosses arranged at the bottom of the filter cavity, and a filtrate channel formed between the bosses on the filter side, the filter cloth is fixed on the filter side of the liner and covers the bottom of the filter cavity, the liner is provided with a feed hole connected to the filter cavity, and a liquid outlet hole connected to the filtrate channel; the liner is provided with a concave press cavity on the press side, the diaphragm is fixed on the press side of the liner and covers the press cavity, and a press joint connected to the press cavity is fixedly connected to the liner.

[0005] Furthermore, the liner is provided with a first sealing surface located on the outer peripheral side of the filter cavity on the filtering side, and the liner is provided with a second sealing surface located on the outer peripheral side of the pressing cavity on the pressing side, and the outer edge of the diaphragm is located outside the inner edge of the second sealing surface.

[0006] Furthermore, a sealing ring is fixed on the outer periphery of the filter cloth, and the lining plate is provided with a first annular groove on the outer surface of the filter side, the first annular groove is located at the outer edge of the bottom of the filter cavity, and the sealing ring is fixedly embedded in the first annular groove of the lining plate.

[0007] Furthermore, the inner surface of the diaphragm facing the liner is provided with a circle of annular ribs, the outer surface of the liner on the pressing side is provided with a circle of second annular grooves, and the annular ribs of the diaphragm are fixedly embedded in the second annular grooves of the liner.

[0008] Furthermore, the diaphragm is provided with multiple layers of damping wires on the outer peripheral side of the annular convex rib, and the multiple layers of damping wires are distributed side by side along the thickness direction of the lining plate.

[0009] Furthermore, there are two feed holes, which are distributed at the upper and lower ends of one side of the liner in the length direction, and there are two liquid outlet holes, which are distributed at the upper and lower ends of the other side of the liner in the length direction.

[0010] Furthermore, the lining plate is provided with a feed branch hole at the feed hole, one end of which extends to the feed hole, and the other end of the feed branch hole extends to the annular cavity wall of the filter cavity.

[0011] Furthermore, the lining plate is provided with a liquid outlet branch hole at the liquid outlet with one end extending to the liquid outlet, and several liquid outlet small holes extending along the thickness direction of the lining plate and with one end extending to the filtrate channel, and the other ends of the several liquid outlet small holes extend to the liquid outlet branch hole.

[0012] Furthermore, the liner is provided with a pressing hole extending along the length direction of the liner, and several pressing branch holes extending along the thickness direction of the liner and one end extending to the pressing cavity, the other ends of the several pressing branch holes extend to the pressing hole, the end of the pressing hole extends to the outer side surface of the liner, and the pressing joint is threadedly connected in the pressing hole.

[0013] The present invention also provides a filter press having a frame, on which a plurality of low-pressure filter plates as described above are mounted, and the plurality of low-pressure filter plates are stacked and arranged in the same direction.

[0014] As described above, the low-pressure filter plate and filter press according to the present invention have the following beneficial effects:

[0015] In the present application, the filtering side of the low-pressure filter plate is used for filtering, and the pressing side is used for pressing. Therefore, by configuring a plurality of low-pressure filter plates stacked in the same direction in the filter press, pressing filtration can be achieved without configuring other functional filter plates; in particular, after the low-pressure pressing medium is introduced into the pressing chamber through the pressing joint, the diaphragm will bulge, and the bulged diaphragm squeezes the material in the filter chamber of another low-pressure filter plate, and the filtrate content in the filter residue is further reduced by low-pressure pressing, thereby effectively reducing the moisture content of the filter residue and improving the yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the front view of the low-pressure filter plate in this application.

[0017] Figure 2 for Figure 1 Right view of .

[0018] Figure 3 for Figure 1 AA section view.

[0019] Figure 4 for Figure 3 Enlarged view of circle B.

[0020] Figure 5 for Figure 1 CC section view.

[0021] Figure 6 It is the rear view of the low pressure filter plate in this application.

[0022] Figure 7 for Figure 6 DD section view.

[0023] Figure 8 for Figure 6 EE section view.

[0024] Fig. 9 This is a schematic diagram of the arrangement of multiple low-pressure filter plates in the filter press in this application.

[0025] Component number description

[0026] 10 Liner

[0027] 101 Filter chamber

[0028] 102 Boss

[0029] 103 Filtrate channel

[0030] 104 Feed hole

[0031] 105 Liquid outlet

[0032] 106 Pressing chamber

[0033] 107 First sealing surface

[0034] 108 Second sealing surface

[0035] 109 First annular groove

[0036] 110 Second annular groove

[0037] 111 Feed branch hole

[0038] 112 Outlet branch hole

[0039] 113 Liquid outlet hole

[0040] 114 Pressing holes

[0041] 115 Pressing support hole

[0042] 116 External slot

[0043] 20 filter cloth

[0044] 30 Diaphragm

[0045] 301 Annular rib

[0046] 302 Damping Line

[0047] 303 Angle ring

[0048] 40 Press joint

[0049] 50 Sealing ring

[0050] 60 Filter Chamber DETAILED DESCRIPTION

[0051] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0052] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0053] The present application provides a filter press and a low-pressure filter plate used for the filter press. The filter press has a frame on which a plurality of low-pressure filter plates are stacked and arranged in the same direction along the thickness direction of the low-pressure filter plates, such as Fig. 9 In addition, for the convenience of description, the directions in the following embodiments are defined as follows: the length direction of the low-pressure filter plate is defined as the left-right direction, the thickness direction of the low-pressure filter plate is defined as the front-back direction, and the height direction of the low-pressure filter plate is defined as the up-down direction; therefore, Figure 1 In the view shown, the left side and the right side of the paper are the left direction and the right direction respectively, the front side and the back side of the paper are the front direction and the rear direction respectively, and the upper side and the lower side of the paper are the upper direction and the lower direction respectively.

[0054] Furthermore, if Figures 1 to 3As shown, the low-pressure filter plate involved in the present application includes a liner 10, a filter cloth 20 and a diaphragm 30. The front side of the liner 10 is a pressing side, and the rear side of the liner 10 is a filtering side. The liner 10 is a solid plate structure, and the outer peripheral contour of the liner 10 can be square, rectangular or circular. The following description of the structure of the low-pressure filter plate will be carried out taking the outer peripheral contour of the liner 10 as an example. The filtering side of the liner 10 is a non-glossy side. The liner 10 is provided with a forward concave filtering cavity 101, a plurality of bosses 102 arranged at the bottom of the filtering cavity 101, and a filtrate channel 103 formed between the bosses 102 on the filtering side; the boss 102 is a small frustum, and the shape, size and arrangement of the boss 102 can be determined according to the filtering requirements; the filter cloth 20 is fixed on the filtering side of the liner 10 and covers the bottom of the filtering cavity 101, so the plurality of bosses 102 and the filtrate channel 103 are covered by the filter cloth 20, but the filter cloth 20 does not cover the annular cavity wall of the filtering cavity 101, and the liner 10 is provided with a feed hole 104 connected with the filtering cavity 101, and a liquid outlet hole 105 connected with the filtrate channel 103, the feed hole 104 is for material to flow into the filtering cavity 101, and the liquid outlet hole 105 is for the filtrate in the filtrate channel 103 to be discharged. The pressing side of the liner 10 is a smooth side, and a pressing cavity 106 which is concave backward is opened on the pressing side of the liner 10. The diaphragm 30 is fixed on the pressing side of the liner 10 and covers the pressing cavity 106. Therefore, the pressing cavity 106 is also formed between the liner 10 and the diaphragm 30. The diaphragm 30 is made of plastic or plastic and has a certain elasticity. A pressing joint 40 which is connected to the pressing cavity 106 is fixedly connected to the liner 10.

[0055] After the above low pressure filter plate is installed in the filter press, Fig. 9As shown, a plurality of low-pressure filter plates are arranged side by side in the same direction in the front-to-back direction and pressed against each other. Therefore, a filter chamber 60 is formed between two adjacent low-pressure filter plates, that is, the diaphragm 30 of the rear low-pressure filter plate covers the filter chamber 101 on the rear side of the front low-pressure filter plate to form the filter chamber 60. The water-containing material enters the feed hole 104 on the low-pressure filter plate through the pipeline in the filter press, and enters the filter chamber 101 on the rear side of the low-pressure filter plate through the feed hole 104. The particles in the filter chamber 101 with a pore size larger than the pore size of the filter cloth 20 are trapped in the filter chamber 101 to form filter residues. The filtrate in the filter chamber 101 with a pore size smaller than the pore size of the filter cloth 20 passes through the filter cloth 20 and is discharged in sequence through the filtrate channel 103 and the liquid outlet 105. After the filtration is completed, the low-pressure pressing medium is passed into the pressing chamber 106 through the pressing joint 40, and then the diaphragm 30 is inflated. The inflated diaphragm 30 squeezes the filter residue in the filter chamber 101 in the low-pressure filter plate in front of it, and the filtrate content in the filter residue is further reduced by low-pressure pressing. The squeezed filtrate is still discharged through the filtrate channel 103 and the liquid outlet 105. Therefore, the front and rear sides of the low-pressure filter plate involved in the present application are respectively a pressing side for pressing and a filtering side for filtering. The low-pressure filter plate has the functions of filtering and pressing. A plurality of low-pressure filter plates stacked in the same direction can be configured in the filter press to achieve pressing filtration without the need to configure other functional filter plates. At the same time, the low-pressure filter plate can also effectively reduce the moisture content of the filter residue and improve the yield.

[0056] Furthermore, if Figure 1 , Figure 3 and Figure 6 As shown, the liner 10 is provided with a first sealing surface 107 located on the outer peripheral side of the filter cavity 101 on the filtering side, and the liner 10 is provided with a second sealing surface 108 located on the outer peripheral side of the pressing cavity 106 on the pressing side; when the two low-pressure filter plates are pressed against each other in the same direction, as shown in FIG. Fig. 9 As shown, the first sealing surface 107 on the rear side of the front low-pressure filter plate and the second sealing surface 108 on the front side of the rear low-pressure filter plate are sealed to achieve sealing between the two adjacent low-pressure filter plates, thereby ensuring the sealing of the filter chamber 60. Preferably, as Figure 1 As shown, the outer edge rate around the diaphragm 30 is higher than the inner edge around the second sealing surface 108 on the liner 10, or in other words, the outer edge of the diaphragm 30 is located outside the inner edge of the second sealing surface 108, which is beneficial to improve the sealing effect between the two adjacent low-pressure filter plates in front and behind. The low-pressure filter plate is sealed on the filter side of the liner 10 through the outer edge of the diaphragm 30, eliminating the need to set a sealing ring on the filter side.

[0057] Furthermore, the fixing structure between the filter cloth 20 and the liner 10 is preferably: Figure 3 and Figure 4As shown, a circle of sealing ring 50 is fixed on the outer periphery of the filter cloth 20, and a circle of first annular groove 109 is provided on the outer surface of the filter side of the liner 10. The first annular groove 109 is located at the outer edge of the bottom of the filter cavity 101. The sealing ring 50 is embedded in the first annular groove 109 of the liner 10, thereby fixing the filter cloth 20 on the filter side of the liner 10, and also achieving that the filter cloth 20 covers the bottom of the filter cavity 101 but does not cover the annular cavity wall of the filter cavity 101. The filter cloth 20 fits the cavity bottom of the filter cavity 101, and because the filter cavity 101 is a concave structure that is concave forward, the filter cloth 20 is a sinking structure that sinks forward. The fixing structure between the diaphragm 30 and the liner 10 is preferably: Figure 3 and Figure 4 As shown, the inner surface of the diaphragm 30 facing the liner 10 is provided with a circle of annular ribs 301, and the outer surface of the liner 10 on the pressing side is provided with a circle of second annular grooves 110 located on the outer peripheral side of the pressing chamber 106. The annular ribs 301 of the diaphragm 30 are fixedly embedded in the second annular grooves 110 of the liner 10, thereby fixing the diaphragm 30 on the pressing side of the liner 10. Preferably, the diaphragm 30 is fixedly provided with two layers of damping wires 302 arranged front and back on the outer peripheral side of the annular ribs 301, and the damping wires 302 play a role in sealing and preventing falling off. The diaphragm 30 with the annular ribs 301 and the two layers of damping wires 302 is an integrally formed part, that is, the annular ribs 301 extend straightly backward from the rear side surface of the diaphragm 30, and the damping wires 302 extend outward from the outer periphery of the annular ribs 301.

[0058] Furthermore, if Figure 1 and Figure 6 As shown, there are two feed holes 104, which are distributed at the upper and lower ends of the right side of the liner 10, and there are two liquid outlet holes 105, which are distributed at the upper and lower ends of the left side of the liner 10. Therefore, the two feed holes 104 and the two liquid outlet holes 105 are distributed at the four corners of the liner 10. Further, as Figure 1 As shown, the diaphragm 30 is provided with hole rings 303 at the two feed holes 104 and the two liquid outlet holes 105, and the pressing side of the liner 10 is provided with external embedding grooves 116 at the two feed holes 104 and the two liquid outlet holes 105. The four hole rings 303 of the diaphragm 30 are respectively buckled in the external embedding grooves 116 at the four corners of the pressing side of the liner 10, further improving the fixing effect between the diaphragm 30 and the liner 10.

[0059] Furthermore, the communication structure between the feed hole 104 on the liner 10 and the filter cavity 101 is preferably: Figure 6 and Figure 7As shown, a feed branch hole 111 is opened at each feed hole 104 in the liner 10, one end of the feed branch hole 111 extends to the feed hole 104, and the two are connected, and the other end of the feed branch hole 111 extends to the annular cavity wall of the filter cavity 101, and the two are connected, so the feed branch hole 111 is only connected to the filtering side of the liner 10, and is not connected to the pressing side of the liner 10; when feeding, the material enters the filter cavity 101 through the feed hole 104 and the feed branch hole 111 in turn, and the material does not pass through the filter cloth 20 when feeding.

[0060] Furthermore, the communication structure between the liquid outlet 105 on the lining plate 10 and the filtrate channel 103 is preferably: Figure 6 and Figure 8 As shown, the lining plate 10 is provided with a liquid outlet branch hole 112 at the liquid outlet hole 105, with one end extending to the liquid outlet hole 105, and several liquid outlet holes 113 extending forward and backward along the thickness direction of the lining plate 10. The rear ends of the several liquid outlet holes 113 extend backward to the filtrate channel 103 at the bottom of the filter cavity 101, and the front ends of the several liquid outlet holes 113 extend forward to the liquid outlet branch hole 112. The liquid outlet branch hole 112 is connected with the liquid outlet hole 105, so the liquid outlet holes 113 and the liquid outlet branch hole 112 are only connected with the filtering side of the lining plate 10, and are not connected with the pressing side of the lining plate 10. When discharging liquid, the filtrate passing through the filter cloth 20 is discharged through the filtrate channel 103, the liquid outlet holes 113, the liquid outlet branch hole 112 and the liquid outlet hole 105 in sequence.

[0061] Furthermore, the connection structure between the pressing chamber 106 on the liner 10 and the pressing joint 40 is preferably: Figure 1 and Figure 5 As shown, the liner 10 is provided with a pressing hole 114 extending left and right along the length direction of the liner 10, and several pressing branch holes 115 extending front and back along the thickness direction of the liner 10. The front ends of the several pressing branch holes 115 extend forward to the pressing chamber 106, and the rear ends of the several pressing branch holes 115 extend backward to the pressing hole 114. The outer end of the pressing hole 114 extends outward to the outer side surface of the liner 10. The pressing joint 40 has a self-tapping coarse thread and a sealing ring 50, and is threadedly connected in the pressing hole 114. The pressing joint 40 is only connected to the pressing side of the liner 10, and is not connected to the filtering side of the liner 10.

[0062] In summary, all materials of the low-pressure filter plate with the above structure must meet the anti-corrosion, sanitation and temperature resistance requirements required by the filter material, and the above low-pressure filter plate can realize the functions of filtering, low-pressure filter pressing, and washing. During filtering, the material enters the filter cavity 101 through the feed hole 104 and the feed branch hole 111 in turn, and the filtrate in the filter cavity 101 that passes through the filter cloth 20 is discharged through the filtrate channel 103, the liquid outlet hole 113, the liquid outlet branch hole 112 and the liquid outlet hole 105 in turn. During low-pressure filter pressing, the low-pressure pressing medium is passed into the pressing cavity 106 through the pressing joint 40, and the diaphragm 30 is stretched, thereby squeezing the filter residue in the filter cavity 101 of another low-pressure filter plate, so that the filtrate in the filter residue is discharged. During washing, the washing medium (such as clean water) enters the filter chamber 101 through the feed hole 104 and the feed branch hole 111 in the same direction as the feed, washes the material in the filter chamber 101, and the waste liquid after washing is discharged in sequence through the filtrate channel 103, the liquid outlet hole 113, the liquid outlet branch hole 112 and the liquid outlet hole 105. During washing, a pressure medium can be introduced into the pressing chamber 106 to achieve washing under pressure to prevent failure due to washing short circuit caused by rupture of the filter residue layer.

[0063] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A low-pressure filter plate, comprising a liner (10), a filter cloth (20) and a diaphragm (30), characterized in that: The lining plate (10) has a filtering side and a pressing side on both sides in the thickness direction thereof; the lining plate (10) is provided with a concave filtering cavity (101) on the filtering side, a plurality of bosses (102) arranged at the bottom of the filtering cavity (101), and a filtrate channel (103) formed between the bosses (102); the filter cloth (20) is fixed on the filtering side of the lining plate (10) and covers the bottom of the filtering cavity (101); the lining plate (10) is provided with a feed hole (104) communicating with the filtering cavity (101), and an outlet hole (104) communicating with the filtrate channel (103); The liner (10) is provided with a concave pressing cavity (106) on the pressing side, the diaphragm (30) is fixed on the pressing side of the liner (10) and covers the pressing cavity (106), and the liner (10) is fixedly connected with a pressing joint (40) which is in communication with the pressing cavity (106); the liner (10) is provided with a first sealing surface (107) located on the outer peripheral side of the filtering cavity (101) on the filtering side, the liner (10) is provided with a second sealing surface (108) located on the outer peripheral side of the pressing cavity (106) on the pressing side, and the diaphragm (30) is fixedly connected to the liner (10) and covers the pressing cavity (106). ) is located outside the inner edge of the second sealing surface (108); the lining plate (10) is provided with a feed branch hole (111) at the feed hole (104) with one end extending to the feed hole (104); the other end of the feed branch hole (111) extends to the annular cavity wall of the filter cavity (101); the lining plate (10) is provided with a liquid outlet branch hole (112) at the liquid outlet hole (105) with one end extending to the liquid outlet hole (105), and a plurality of liquid outlet small holes (113) extending along the thickness direction of the lining plate (10) and one end extending to the filtrate channel (103). ), the other ends of several liquid outlet holes (113) extend to the liquid outlet branch hole (112), the lining plate (10) is provided with a pressing hole (114) extending along the length direction of the lining plate (10), and several pressing branch holes (115) extending along the thickness direction of the lining plate (10) and one end extending to the pressing chamber (106), the other ends of several pressing branch holes (115) extend to the pressing hole (114), the end of the pressing hole (114) extends to the outer side surface of the lining plate (10), and the pressing joint (40) is threadedly connected in the pressing hole (114).

2. The low-pressure filter plate according to claim 1, characterized in that: A sealing ring (50) is fixed on the outer periphery of the filter cloth (20); a first annular groove (109) is provided on the outer surface of the filter side of the lining plate (10); the first annular groove (109) is located at the outer edge of the bottom of the filter cavity (101); and the sealing ring (50) is fixedly embedded in the first annular groove (109) of the lining plate (10).

3. The low-pressure filter plate according to claim 1, characterized in that: The diaphragm (30) is provided with a circle of annular ribs (301) on the inner surface facing the liner (10), and the liner (10) is provided with a circle of second annular grooves (110) on the outer surface on the pressing side, and the annular ribs (301) of the diaphragm (30) are fixedly embedded in the second annular grooves (110) of the liner (10).

4. The low-pressure filter plate according to claim 3, characterized in that: The diaphragm (30) is provided with multiple layers of damping wires (302) on the outer peripheral side of the annular convex rib (301), and the multiple layers of damping wires (302) are distributed side by side along the thickness direction of the lining plate (10).

5. The low-pressure filter plate according to claim 1, characterized in that: There are two feed holes (104) distributed at the upper and lower ends of one side of the liner (10) in the length direction, and there are two liquid outlet holes (105) distributed at the upper and lower ends of the other side of the liner (10) in the length direction.

6. A filter press having a frame, characterized in that: A plurality of low-pressure filter plates according to any one of claims 1 to 5 are mounted on the frame, and the plurality of low-pressure filter plates are stacked and arranged in the same direction.

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