JPS6221321Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a catalyst support sealing device, and in particular, in a forced coating device that applies alumina slurry coating to a monolithic support such as a honeycomb, the present invention is intended to prevent leakage of alumina slurry and prevent the leakage of alumina slurry. This allows the support to be transported.

A monolithic catalyst such as a honeycomb having a large number of cells with a small cross-sectional area is usually made on a monolithic support having a small surface area and low activity, but high strength and a low coefficient of thermal expansion, by one of the following methods. That is, it can be manufactured by coating a monolithic support with a slurry made of activated alumina powder with a large specific surface area, drying and firing it, and then supporting it with a noble metal solution.
Alternatively, a slurry made of activated alumina powder supported with a noble metal solution is applied in advance.
It is made by drying and firing.

In the above manufacturing process, slurry application, ventilation drying, and precious metal support are carried out as efficiently as possible.
A method of sealing the outer walls of a monolithic support for application within the small cross-sectional area cells of the monolithic support is desired. There is also a need for a method for safely transporting ceramic monolith supports between processes without damaging them, even if they are relatively fragile.
Conventionally, such methods and devices have not been sufficient, and the sealing method is to press the upper and lower outer walls of the monolith support with an elastic body such as a rubber plate to seal the alumina slurry to prevent it from leaking. There is. However, in this conventional method, unless the support is set on the rubber plate with a fairly high degree of reliability, the cells of the support will wrap with the rubber plate, and the slurry coat will not be coated in the wrapped cells. Another method is to reduce the overlap between the cells and the rubber plate by making the rubber plate slope, but in this case, a slight misalignment when setting the support causes the support to tilt, resulting in Slurry will leak out of the support. Furthermore, when automatic transportation is used for inter-process transportation during the catalyst manufacturing process, there is a problem that the support is easily damaged by the impact when the support is grabbed.

The present invention is a monolith support sealing device such as a honeycomb that seals the support so that when coating the inner walls of microcells with activated alumina slurry, the slurry passes only inside the cells and does not leak to other parts. The main purpose is to provide the following, and the sealing device has a function as a holder for transferring and transporting the support, and further,
One of the purposes is to use it in a process other than alumina coating, such as a drying process or a supporting process, so that it also has the function of flowing air or liquid only inside the cell.

For this reason, the configuration of the present invention is to surround the monolith support with a cylindrical sealing material made of a rubber-like elastic material, and to arrange a cylindrical holder around the outer periphery of the sealing material. and the sealing material, or a tube-shaped sealing material made of a rubber-like elastic body is used to form a pressure chamber constituted by the sealing material alone; This device is characterized in that a valve is provided on the outer wall of the holder to allow pressure fluid to enter and exit the pressure chamber.

Hereinafter, embodiments of the present invention and comparison with conventional devices will be described with reference to the drawings.

FIG. 1 is a central sectional elevational view showing a first embodiment of the present invention. In the figure, 1 is a monolith support such as a honeycomb, 1a is its upper end surface, 1b is its lower end surface, and 1c is its outer periphery. 2 is a center line; 3 is a cylindrical sealing material made of a rubber-like elastic body; 4 is a holder for holding the outer wall of the sealing material 3;
5 is a pressure chamber; 6 and 7 are automatic valves that allow pressure fluid to flow into or out of the pressure chamber 5; and 8 is a liquid receiving tank.

That is, since the sealing material 3 is held by the holder 4, first, the monolith support 1 is properly placed in the sealing material 3, and then the automatic valve 6 is opened to supply compressed air, pressure water, or Pressure fluid such as pressure oil is injected into the pressure chamber 5 formed between the sealing material 3 and the holder 4. At this time, automatic valve 7 is closed. In this way, the sealing material 3 mainly swells toward the support 1 due to the injection of the pressure fluid, completely sealing the outer peripheral portion 1c of the support 1 except for the upper end surface 1a and the lower end surface 1b, and The sealing material 3 and the holder 4 are integrally coupled. In this state, activated alumina slurry is introduced from above the support 1 and simultaneously sucked from below, thereby making it possible to efficiently pass the slurry only through the inner walls of the support cells.

FIG. 2 is a partially sectional elevational view showing transportation and hot air drying using the monolith support sealing device of FIG. 1. In FIG. 2, 9 is a sealing material holder hanging jig, 10 is a cylinder rod, 11 is a cylinder, 12 is a cylinder support, 13 is a pulley, 1
4 is a rail, 15 is a hot air discharge nozzle, 16 is a hot air discharge port, 17 is a hot air supply pipe, and 18 is an automatic hot air supply valve. That is, the monolithic support 1 has its outer peripheral portion 1c completely sealed by the sealing material 3. Therefore, as described above, the support 1 coated with activated alumina slurry is conveyed to the hot air drying stage by the pulley 13 moving on the rail 14 while being sealed and held by the sealing material 3. . There, the hot air blown out from the discharge port 16 of the hot air discharge nozzle 15 dries it. Note that the vertical movement of the sealing material holder 4 is performed by the cylinder 11.

Furthermore, an advantage of the present invention is that the tolerance for misalignment of the support 1 is greater than that of the prior art.

For example, in the conventional method, as shown in and in FIG. 3, the support 1 is manually or automatically placed on the lower edge sealing material 19, and then, as shown in FIG. The upper edge sealing material 20 is manually or automatically pressed onto the top of the upper edge sealing material 20 for sealing. Then, as shown by the arrow 22 in FIG. Slurry tends to leak from the contact portion of the support 1. In other words, when the support 1 is manually or automatically set as shown in Fig. 4, if the support 1 deviates from the center line 2, which is the center of the device, as shown by dotted lines a and b. , the support 1 is tilted, creating a gap between the upper edge sealing material 20 and the upper part of the support, causing slurry to leak.
On the other hand, in the sealing device of the present invention, as shown in FIG.
When the support body 1 is placed on the liquid receiving tank 8, the support body 1 is completely sealed by the sealing material 3, so as long as the holder 4 is placed on the liquid receiving tank 8, the alumina slurry will not leak outside. without being coated within the support cells. That is, the permissible misalignment dimension of the support during coating according to the present invention is _l2 shown in FIG. 5, which is determined by the dimension _l3 . The dimensional relationship is l ₂ 〓l ₃ . Increasing the dimension l ₃ poses no particular problem in terms of the device, and is at least much larger than the allowable dimension l ₁ of the conventional system shown in FIG. 4. Furthermore, the third
Reference numeral 21 in the figures to FIG. 5 is an arrow indicating the suction direction.

FIG. 6 is a central sectional elevational view showing a second embodiment of the present invention. In the first embodiment, the pressure chamber 5 was formed by combining the sealing material 3 and the holder 4, but in this second embodiment, the sealing material 3 made of a rubber-like elastic body was formed into a tube shape. , the pressure chamber 5 is constituted by the sealing material 3 alone. The configuration shown in FIG. 6 is basically the same as the first embodiment.

As described above, according to the present invention, the sealing material is made of an elastic material such as a rubber plate, and the outer peripheral portion of the monolithic support is expanded by causing pressure fluid to flow into the pressure chamber and inflating the sealing material. Because it seals,
When coating the inner walls of microcells with activated alumina slurry, the slurry passes only through the inside of the cell and does not leak to other areas, improving the efficiency of alumina coating. In addition, since the sealing material is held by the holder, as explained in FIGS. 4 and 5 above, the tolerance for misalignment of the monolith support is greater than in conventional devices, and the main The invented device has the function of a holder for transferring and transporting the support, and also has the function of flowing airflow and liquid only inside the cell even in the drying process and supporting process, which are processes other than alumina coating. The effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a central cross-sectional elevation view showing the first embodiment of the present invention, and FIG. 2 is a diagram showing the state in which the monolith support sealing device of FIG. 1 is used for conveyance and hot air drying. 3 is an explanatory diagram of the conventional method, FIG. 4 is an explanatory diagram of support misalignment tolerance using the conventional method, and FIG. 5 is an illustration of support misalignment tolerance using the apparatus shown in FIG. 1. The explanatory diagram, Figure 6, is the second figure of the present invention.
FIG. 2 is a central cross-sectional elevational view showing an example. 1... Monolith support, 1a... Upper end surface, 1b
...Lower end surface, 1c...Outer periphery, 2...Center line, 3
... Seal material, 4 ... Seal material holder, 5 ... Pressure chamber, 6, 7 ... Automatic valve, 8 ... Liquid receiving tank.

Claims (1)

[Scope of utility model registration request] The monolith support is surrounded by a cylindrical sealing material made of a rubber-like elastic body, a cylindrical holder is disposed around the outer periphery of the sealing material, and the holder is closed between the holder and the sealing material. A pressure chamber made of a tube-shaped sealing material made of a rubber-like elastic body is formed, and a pressure chamber composed of the sealing material alone is formed. A catalyst support sealing device characterized by being provided with a valve for allowing pressure fluid to enter and exit.