JPH0131287Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressing filter plate used in a filter press having a pressing mechanism.

As shown in Fig. 7, a filter plate used in a filter press has a so-called squeezing mechanism that squeezes and dehydrates a cake by injecting high-pressure fluid between a core plate and a diaphragm attached to the core plate. Board 1
The edges of the frame-shaped outer peripheral parts 5, 5 formed on the respective peripheral edges of the pair of diaphragms 2, 2 covering both sides of the core plate 1 are butted together at the outer periphery of the core plate 1, and further, the outer peripheral part is A frame-shaped presser frame 3, 3 is attached to the portion spanning 5, 5, and by tightening both presser frames 3, 3 with bolts 8, the diaphragm 2, 2 is placed between the core plate 1 and the presser frames 3, 3. Since it is normally fixed by pressing, the head of the bolt 8 may pop out due to insufficient tightening during assembly or loosening of the bolt 8 during operation, and the head of the bolt 8 may be covered with the diaphragm 2. Not only is there a risk of damaging the filter cloth by contacting it with the filter cloth (not shown), but also the structure of the holding frames 3, 3 for fixing the diaphragms 2, 2 to the core plate 1 becomes complicated, which increases the manufacturing cost. Another drawback is that it requires manpower and time to replace the diaphragms 2, 2, which are attached and fixed to both sides of the core plate 1. Also,
A compressor filter plate using a bag-shaped diaphragm is also known, as described in Utility Model Publication No. 55-52890, but this type also does not solve the disadvantage of requiring labor and time to replace the diaphragm, and the core The structure of the plate becomes complicated and the manufacturing cost increases, so there is a strong demand for the development of a compressor filter plate that is easy to manufacture, inexpensive, and has a diaphragm that can be easily replaced.

The present invention was completed with the aim of producing a compressed filter plate that met the above-mentioned demands.Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 6.

Reference numeral 1 denotes a rigid core plate in which a frame portion 1b made of hard rubber is fitted around the periphery of a rectangular core metal 1a, and both sides of the core plate 1 are provided with a pair of diaphragms 2, which are separated from each other.
The diaphragms 2, 2 are covered with a core plate 1 and a fixing outer frame 3 surrounded by the core plate 1, and the outer peripheral parts 5, 5 are pressed and fixed to the outer peripheral surface of the core plate 1. ing. Each of the diaphragms 2, 2 has a frame-shaped outer peripheral part 5 integrally molded on the periphery of a rectangular filtering surface part 4, and the outer peripheral part 5 of one diaphragm 2 and the outer peripheral part 5 of the other diaphragm 2 are joined. An elongated engagement recess 6 and a pair thereof are provided on the front inner surfaces of the outer peripheral parts 5, 5 in the first and second embodiments, which are the joint surface parts, or on the front end surfaces of the outer peripheral parts 5, 5 in the third embodiment. An engaging convex portion 7 is provided over the entire circumference, and by engaging the engaging convex portion 7 with the engaging concave portion 6 so as not to disengage in the left-right direction, both diaphragms 2, 2 are attached to the outer circumference of the core plate 1. are engaged and connected at the center. That is, each diaphragm 2 in the illustrated embodiment is provided with a series of engagement recesses 6 and a series of engagement protrusions 7 in the left half and right half of the outer peripheral portion 5, symmetrically with respect to the vertical center line of the diaphragm 2. The same diaphragms 2, 2 are placed facing each other with the core plate 1 in between, and an engaging recess 6 and an engaging protrusion 7 provided on the entire circumference of the outer circumferential portion 5 of one, respectively An engaging convex portion 7 and an engaging recess 6 provided on the entire circumference of the outer peripheral portion 5 of the
The pair of diaphragms 2, 2 are connected at the outer circumferential portions 5, 5 so that their upper and lower surfaces are both planar, and cover the core plate 1. The outer peripheral parts 5, 5 of the diaphragms 2, 2, which are connected by engaging the engaging convex part 7 in the engaging recess 6, are surrounded by the outer peripheral surface of the core plate 1 and the bolts 8. It is pressed and fixed between the flat inner circumferential surface of the fixing outer frame 3 having a rectangular cross-section and fixed to the core plate 1 with the support plate 1 so as not to be displaced in the vertical direction. In addition, 9 in the figure is a seal portion formed between the filtering surface portion 4 and the outer peripheral portion 5 of the diaphragm 2 in correspondence with the frame portion 1b of the core plate 1;
Reference numeral 10 is provided on the inner surface of the seal portion 9 and is attached to the frame portion 1.
b, a sealing protrusion for airtightly adhering the sealing part 9; 11, a protrusion provided on the lower outer surface of the filter surface part 4 to form a filtrate discharge groove 12 therebetween; 1;
3 is a compressed fluid supply/discharge port provided at the lower end of the compressed filter plate for supplying or discharging compressed fluid between the core plate 1 and the diaphragm 2, and 14 is an air gap between the core plate 1 and the diaphragm 2. An air supply/discharge port 15 is provided at the upper end of the compressed filter plate for supplying or discharging filtrate, and 15 is for collecting the filtrate discharged through the filtrate discharge groove 12 provided in the diaphragm 2 and discharging it outside the machine. , is a filtrate discharge port provided at the center of the lower end of the diaphragm 2 to communicate with the filtrate water collection port 15, and in the second embodiment shown in FIG.
In order to more firmly fix the diaphragms 2, 2 to the core plate 1, the engagement protrusions 7 are engaged with the engagement recesses 6, and the diaphragms 7 are fitted onto the connected outer peripheral parts 5, 5 at a required interval. This is a U-shaped clip having elasticity that presses and fixes the outer circumferential portions 5, 5 to the core plate 1. Further, if the engaging concave portion 6 and the engaging convex portion 7 are provided over the entire circumference of the outer peripheral portions 5, 5, and have a shape in which both the upper and lower surfaces are flat in the engaged state and are difficult to separate in the left and right direction, In addition to having a hook shape as shown in the first and second embodiments, it may have a dovetail shape, or
It may also have a spherical shape as shown in the third embodiment,
In addition, in the illustrated embodiment, the engaging concave portion 6 and the engaging convex portion 7 are provided symmetrically with respect to the vertical center line on the outer peripheral portion 5 of each diaphragm 2, and two identical diaphragms 2 are used to cover the core plate 1. However, it is also possible to provide only the engaging concave portion 6 on the outer peripheral portion 5 of one diaphragm 2, while providing only the engaging convex portion 7 on the outer peripheral portion 5 of the other diaphragm 2. As described above, in the present invention, the diaphragms 2, 2 are engaged with each other over the entire circumference so that the upper and lower surfaces become flat, but special parts such as the attachment part of the filtrate discharge fitting are is not limited to this, and the term "full circumference" in this specification should be understood to include such exceptions.

When this structure is used in the same way as the compression filter plate of a conventional filter press, the pair of diaphragms 2, 2 that cover both sides of the core plate 1 have a frame-shaped outer periphery formed on each periphery. parts 5, 5 to core plate 1
An engaging convex portion 7 provided on the other outer circumferential portion 5 over the entire circumference is engaged with an engaging recess 6 provided on one outer circumferential portion 5 over the entire circumference so as to be difficult to disengage in the left-right direction. In addition, both outer circumferential parts 5, 5 are press-fixed over the entire circumference by the core plate 1 and a fixing outer frame 3 surrounded by the outer circumference of the core plate 1 to prevent displacement in the vertical direction. Therefore, even if the diaphragms 2, 2 receive internal pressure during the normal operation of pressurizing high-pressure fluid between the core plate 1 and the diaphragms 2, 2 to compress and dehydrate the cake, the diaphragms 2, 2 will not separate or deform. This means that it can be used continuously for a long time. Moreover, diaphragm 2, 2
By simply providing the engaging concave portion 6 and the engaging convex portion 7 on the entire circumference of the outer peripheral portions 5, 5 during molding, the diaphragm 2 does not need to have a complicated structure, and the core plate 1 and the outer frame 3 are Even if the shape is extremely simple compared to conventional ones, the diaphragms 2, 2 are firmly fixed to the core plate 1 as described above, so the manufacturing cost is extremely low compared to conventional squeeze filter plates. It has various advantages, such as being inexpensive, allowing the diaphragms 2, 2 separated from each other to be replaced individually, and the number of man-hours required for replacement being extremely reduced.

As is clear from the description of the embodiments described above, the present invention has a pair of diaphragms covering both sides of a core plate, in which an engaging recess provided on the outer periphery of one engages an engaging protrusion provided on the outer periphery of the other. The outer peripheries of both diaphragms are connected together so that both the upper and lower surfaces are flat around the entire outer periphery of the core plate, and the inner periphery of both outer peripheries surrounded by the outer periphery of the core plate is flat. Since the diaphragm is press-fixed to the core plate with a fixed outer frame, not only is the diaphragm properly fixed to the core plate, but the structure of the core plate and outer frame is simplified, reducing manufacturing costs. It is of great practical value as a press filter plate, which has various advantages such as being able to easily replace the diaphragm.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention, FIG. 2 is a partially cutaway perspective view, and FIG. 3 is a partially cutaway side view similarly shown in an exploded state.
4 is a view taken along the line A-A in FIG. 1, FIG. 5 is a partially cutaway side view showing a second embodiment of the present invention, and FIG. 6 is a side view showing a third embodiment of the present invention. FIG. 7 is a partially cutaway side view showing a typical example of a compressed filter plate of a conventional filter press. 1: Core plate, 2: Diaphragm, 3: Outer frame, 5:
Outer peripheral part, 6: Engagement recess, 7: Engagement protrusion.

Claims (1)

[Scope of utility model registration request] Of a pair of mutually separated diaphragms that cover both sides of the core plate, an engaging concave portion is provided on the outer periphery of one of the diaphragms, and an engaging convex portion is provided on the outer periphery of the other diaphragm. are engaged with each other around the entire outer periphery of the core plate in such a way that they are difficult to separate from in the left-right direction and that both the upper and lower surfaces are flat, and furthermore, both outer peripheries are surrounded by the core plate and have an outer surface that has a flat inner circumferential surface. A compressed filter plate characterized in that the frame is fixed to the core plate so that it cannot be displaced in the vertical direction.