JP5158756B2 - Switching valve mechanism - Google Patents

Description

  The present invention relates to a switching valve mechanism, and more particularly to an improvement in a switching valve mechanism for switching the direction of a conveyance path in a conveyance system that conveys granules, pellets, and the like.

  Conventionally, as a switching valve mechanism used for the above-described purposes, a plurality of curved connection pipes, mainly three, are arranged radially at a pitch of 120 degrees, and a support shaft is provided at the center of the three transfer connection pipes. It is known that a switching valve having a substantially ball shape rotating in the casing is provided in the casing, and each of the above-mentioned transport connection pipes is fixedly connected to a short pipe of the casing.

  This switching valve is formed with a communication port connected to the opening of the transport connection pipe at a pitch of 120 degrees. The communication port corresponds to a short pipe of the casing. By rotating this switching valve, Of the three transport connection pipes described above, two are connected and connected to switch the transport path.

  In addition, the transport connection pipe described above is formed to have a curved shape so that the system fits in a predetermined space area, but there is no gap between the opening of the transport connection pipe and the communication port of the switching valve, that is, there is no leakage of the transport object. In order to make a connection, as shown in FIG. 3, the diameter of the opening 2 a of the transport connection pipe 2 is usually set smaller than the diameter of the communication port (short pipe) 1 of the casing.

Because of this mechanism, the edge of the opening 2a of the transport connection pipe 2 will form a step 2b in the transport path, and the transport object is, for example, a small lump such as rice grain or plastic, A, In the case of A ..., there were many cases in which a crash occurred on the stepped part and crashed.
Although the applicant investigated the prior art documents related to the present invention, the applicant could not find any documents that seem to be particularly related to the present invention.

  The problem to be solved by the present invention is that, conventionally, a stepped portion is generated due to a difference in the tube diameter at the connection portion between the rotating switching valve, particularly the short tube of the casing and the conveyance connection pipe, and depending on the object to be conveyed. Crashes, and in the case of fine powder or the like, there is an adverse effect such as stagnation due to the stepped portion or eddy current when the object is a fluid.

In order to solve the above-described problems, the switching valve mechanism according to the present invention is formed of a plurality of castings, and has a curved connecting connection pipe arranged radially, and a central portion of the plurality of transferring connection pipes. And a transfer path switching valve that rotates in the casing, and an inner surface of a connection portion between the opening of the switching valve and the opening of the transport connection pipe is formed in a tapered shape, and the connection portion is integrated with the casing. In the switching valve mechanism having an inner tube on the inner surface of the short tube portion, the inner peripheral surface of the inner tube has a tapered shape with a large diameter on the primary side, and the short tube portion It is characterized in that a difference in tube diameter formed by the transport connection pipe is absorbed and a step portion is not generated .

  The switching valve mechanism according to the present invention is configured as described above. For this reason, there is no stepped portion due to the difference in the pipe diameter in the connection connecting portion between the short pipe of the casing and the transport connection pipe, and no special processing is applied to the conventional switching valve or the transport connection pipe. Since the difference can be absorbed and the object can be transported more smoothly, the object does not crash or the like.

  This was realized by configuring as illustrated in the drawings and described in the examples.

  Next, a preferred embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially broken plan view showing a switching valve mechanism embodying the present invention, and FIG. 2 is a view showing the switching valve.

  In these drawings, 10 indicates a casing, and 11 indicates a lid of the casing 10. Reference numeral 12 denotes a valve body that rotates in the casing 10. A shaft 12 a projects from the center of the top surface of the valve body 12, and the shaft 12 a projects from the substantially center of the lid 11 to the outside. The shaft 12a is provided with a detent key 12b that is engaged with a shaft of a rotational drive source such as a motor.

  The casing 10 is integrally formed with three short pipes 13a, 13b, 13c radially at a pitch of 120 degrees, and each of the short pipes 13a, 13b, 13c has a curved casting. The transport connection pipes 14a, 14b, and 14c are integrally connected.

  Further, a flange 15 is integrally formed at the outer opening edge of the transport connection pipes 14a, 14b, 14c, and bolt holes 15a, 15a,... A pipe (not shown) is fastened by bolting the corresponding flange via bolt holes 15a, 15a.

  Since the inner diameters of the transport connection pipes 14a, 14b, and 14c are set smaller than the inner diameters of the short pipes 13a, 13b, and 13c, the transport connection pipes 14a, 14b, and 14c are formed at the joint portions. The step portion is formed by the thickness of the. In the present embodiment, in order to eliminate this stepped portion, the inner pipe 16 made of stainless steel is provided on the inner peripheral surface of the short pipe 13a, 13b, 13c.

  The inner peripheral surface of the inner pipe 16 is tapered with the diameter of the short pipes 13a, 13b, 13c, that is, the primary side being increased, and the secondary side diameter is the short pipe of the transport connection pipes 14a, 14b, 14c. 13a, 13b, 13c is smaller than or equal to the inner diameter of the connection port.

  Furthermore, the above-mentioned inner tube 16 has a convex cross section, and between the inner tube 16 and the short tubes 13a, 13b, 13c is a kind of fluororesin on the valve body 12 side, and in particular, only carbon and fluorine. A PTFE sheet ring 17 made of polymer is interposed as a packing, and a silicon plate ring 18 is interposed on the transport connection pipes 14a, 14b, and 14c side.

  On the other hand, communication ports 12c and 12c are opened at a pitch of 120 degrees in the valve body 12, and the communication ports 12c and 12c are connected to the short pipes 13a and 13c or 13b and 13c by rotating the valve body 12. Communicate. The opening edge of the communication port 12c is positioned slightly inward of the primary side of the inner tube 16 having a large diameter so that there is no leakage of the conveyance object.

  The switching valve mechanism according to the present embodiment is configured as described above. Since the tapered inner tube 16 whose inner peripheral surface has a large diameter on the primary side is provided inside the short tubes 13a, 13b, and 13c, the object to be conveyed is conveyed along the tapered surface without any obstacles during conveyance. As a result, there is no possibility of causing a crash even with a granular material or a pellet-like material, there is no possibility of wasting the product, and cleaning and maintenance work can be facilitated because there is no residue.

  The switching valve mechanism according to the present embodiment is configured as described above. In this embodiment, with regard to the conveyance of granular materials and pellets, the main purpose is to protect the crash, but the object is not limited to this, and the present invention can be applied to fine powders, liquids, and gaseous fluids.

  In this embodiment, the inner pipe is used. However, as long as processing is possible, the inner peripheral surface of the transport connection pipe, in particular, the connection opening is tapered to form a guide portion, or the tapered surface is continuously formed. For example, the stepped portion can be eliminated.

It is a partially broken top view which shows the switching valve mechanism which implemented this invention. It is a figure which shows a switching valve. It is a figure which shows a prior art example.

Explanation of symbols

10 casing 11 lid 12 valve body 12a shaft 12b key 12c communication port 13a short pipe 13b short pipe 13c short pipe 14a transport connection pipe 14b transport connection pipe 14c transport connection pipe 15 flange 15a bolt hole 16 inner pipe 17 PTFE ring 18 silicon plate ring

Claims (1)

Conveying connection pipes that are formed of a plurality of castings and have a curved shape are radially arranged, and a switching valve for a conveyance path that rotates in the casing is provided at the center of the plurality of conveying connection pipes. The inner surface of the connection portion between the opening and the opening of the transport connection pipe is formed in a tapered shape, and the connection portion described above is a short tube portion integrally provided in the casing, and the inner tube is formed on the inner surface of the short tube portion. In the switching valve mechanism provided, the inner peripheral surface of the inner pipe is tapered with the primary side having a large diameter, absorbing the difference in the pipe diameter formed by the short pipe part and the conveying connection pipe, and the step part is A switching valve mechanism characterized in that it does not occur .

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