JPH0464528A - Rotary valve - Google Patents

Abstract

PURPOSE:To remove deposit from a rotor blade by setting a pair of rotor blades so that their rotation direction rotates downward a casing side and placing them so that the blades are engaged with each other. CONSTITUTION:Rotors 3a, 3b are placed side by side at the center in a casing 2 so that rotation axes 5a, 5b are horizontally separated with an approximate distance, while radial rotor blades 4a, 4b are provided on outer peripheries. The casing 2 is provided to enclose the two blades 4a, 4b with a slight gap on an outer periphery of the blades 4a, 4b while both blades 4a, 4b are provided to engage with each other. The rotors 3a, 3b are rotated so that the blades 4a, 4b direct downward with respect to the casing 2 and also a guide plate 8 is provided to direct outward above the rotors. Therefore powder is dropped outside with rotation of the rotors and even if powder attaches to recesses between the blades, the powder is scraped down by the other blades to be prevented from attaching.

Description

[Detailed Description of the Invention] [Industrial Application Field J] The present invention relates to a rotary valve used in fields that handle powder and granular materials, such as the cement industry, chemical industry, and food industry. This is to prevent the generated materials being transported from adhering to the rotor blades of the rotary valve and other surfaces.

[Prior Art] A rotary valve attempts to discharge only the transported material to another system while maintaining the airtightness of the powder and granular materials before and after the entrance and exit. A rotor 3 having a plurality of rotor blades 4 at equal intervals around the periphery inside a casing 2 rotates around a rotating shaft 5, and there are bearings (not shown) on both sides of the rotating shaft 5. A driving motor is directly connected to one end of the rotating shaft 5, or is rotationally driven via a chain wheel and a roller chain. 6 is an inlet, and 7 is an outlet. Then, the material to be transported consisting of powder and granules rotates and falls while being stored in the recess between the rotor blades 4 and enters the entrance 6. It is discharged while maintaining airtightness between the discharge lowers.

[Problems to be solved by the invention] Rotary valves handle dry powder and granular materials, but
Some of these materials have a high water content and are mainly composed of fine particles.When handling large quantities of such materials for a long period of time, it is necessary to This adheres to the skin and gradually develops over time and hardens, making it difficult to peel off easily. If this condition continues, it will become difficult to pass through the rotary valve, resulting in a decrease in discharge capacity.
This causes inconveniences such as equipment troubles.

Therefore, measures have been desired to prevent such adhesion from occurring as much as possible and to prevent the development of adhesion substances.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the rotary valve of the present invention includes a plurality of valves on the outer periphery of a rotor that rotates powder and granular material in a casing while blocking air circulation between the inlet and outlet. In a rotary valve that discharges air by means of attached rotor blades, a pair of rotors are disposed in the center of the casing with their rotating shafts separated by an appropriate distance in the horizontal direction, and the direction of rotation of both rotors is such that the casing side of the rotors is The rotor blades surrounding both rotors are set to rotate downward and are arranged so as to mesh with the rotor blades of the other rotor, and the feed material is transferred between the rotary valve inlet and the two rotors. The configuration includes a guide plate that allows it to fall toward the casing side.

[Function] First, the powder and granular material supplied to the rotary valve of the present invention is
It is divided into two by a guide plate for guidance, and falls toward the upper side of each of the pair of rotors.

Here, both rotors are rotating in opposite directions, and the outer side rotates to move the transported object downward, so it falls between the rotor blades and falls downward, and eventually exits the discharge port. It is discharged downward.

On the other hand, in the center portion of both rotors, the rotor blades of both rotors are meshed like gears, and one rotor blade acts to peel off adhered transported objects that are stuck between the rotor blades of the other rotor and do not fall downward. , the deposits fall off the rotor blade surface and fall downward along the outer side of the rotor together with the New Feed transport material.

In this way, in the present invention, the detachment of deposits is performed at the meshing portion of the rotor blades of the pair of rotors, so that the development of deposits can be prevented.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the rotary valve of the present invention.

In the figure, 1 is a rotary valve, 2 is a casing, and 3 is a rotary valve.
a, 3b are rotors, 4a, 4b are rotor blades, 5a, 5
b is the rotating shaft, 6 is the inlet, 7 is the discharge port, and 8 is the guide plate for guiding the raw material.
Two rotors 3a and 3b are arranged in parallel at the center of the interior with rotating shafts 6a and 5b separated by an appropriate horizontal distance, and a casing 2 with a large inner diameter is placed on the outside with a small gap of about 3 to 5 mm. It is provided so as to surround two rotors. A plurality of (six in this embodiment) rotor blades 4a, 4b arranged radially at equal intervals are integrally attached to the outer periphery of the rotors 3a, 3b. Further, the two rotors are arranged such that the other rotor blade fits between the blades of one rotor, and the rotors are configured to rotate in opposite directions. That is, the rotor 3 on the left side of the figure
The rotor a rotates counterclockwise, and the rotor 3b on the right side of the figure rotates clockwise. Further, between the inlet 6 and both rotors 3a and 3b, a guide plate 8 having a cross-sectional shape of, for example, an evenly extending section is installed in the form of a bridge between the front and rear casings 2 in the drawing. A drive device (not shown), such as a direct-coupled motor, a chain wheel, or a roller chain, is connected to at least one of the rotating shafts 5a, 5b so that the two rotors 3a, 3b are rotated at a constant speed in opposite directions. .

Next, the operation of the rotary valve of the present invention configured as above will be explained.

After driving both rotors to rotate, raw material powder is introduced from the inlet, and the raw material is divided into approximately two parts by the guide plate 8 and falls toward the outside of both rotors. The fallen raw material is stored in the recess formed by the rotor blades 4a, 4a or the rotor blades 4b, 4b, falls and moves outward as the rotor rotates, and is discharged from the rotary valve 1 via the discharge lower.

On the other hand, near the center of both rotors, the rotor blades of the other rotor enter the recess between the rotor blades and rotate together, so even if there is material deposited in the recess, the rotor blades of the other rotor that have entered the recess will be removed. Since the rotor blade scrapes off the raw material adhering to these recesses, the development of the raw material adhering to the recesses is suppressed, and the degree of adhesion is maintained below a certain limit. In this way, in the rotary valve of the present invention, both rotors promote the transfer and fall of the raw materials transported in their outer portions, and remove the deposits between the rotor blades of the opposite rotor in their inner portions. Since cleaning is performed continuously during operation, equipment troubles due to the development of deposits can be prevented.

In FIG. 1, which is an embodiment of the present invention, the rotor blades 4a, 4b, etc. are shown as extending radially in a straight line. The blade may have a curved surface shape.

[Effects of the Invention] As described above, the rotary valve of the present invention has a pair of rotors, the rotation directions are opposite, and the rotor blades provided around both rotors are spaced between each other. Since the rotors are arranged so as to mesh with each other, and a guide plate for guiding the raw material is provided between the inlet and both rotors, it has the function of constantly removing deposits on the rotor blades etc. that develop during operation.

Therefore, even if the raw material contains a large amount of water and is highly adhesive, it can be operated safely and continuously for a long period of time, resulting in excellent maintainability.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing one embodiment of a conventional rotary valve. 1...Rotary valve, 2...Casing, 3, 3a, 3b----0-Yu,
4.4a, 4b...Rotor blade, 5.5a, 5
b... Rotating shaft, 6... Inlet, 7... Outlet, 8... Guide plate. Figure 1 Patent applicant Ube Industries Co., Ltd. Figure 2

Claims (1)

[Claims] (1) In a rotary valve that discharges powder and granules using multiple rotor blades attached to the outer circumference of a rotor that rotates within a casing while blocking air flow between the inlet and outlet, a rotating shaft is located in the center of the casing. A pair of rotors are arranged with a suitable distance apart in the horizontal direction, and the rotation direction of both rotors is set so that the casing side of the rotors rotates downward, and the rotor blades provided around the two rotors are A rotary valve that is arranged to mesh with a rotor blade of a rotor, and is provided with a guide plate between an inlet of the rotary valve and the two rotors to cause the feed material to fall to the casing side of the two rotors.