JPH0138492Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a multi-box flow meter. Here, the double box type liquid meter is a conventional example applied to an impeller type water meter, as shown in Figure 1, which is a meter that integrates the flow rate of the measured liquid flowing in from the inlet 1 and flowing out from the outlet 2. an outer box having a device 3, an inner space 4 which opens at the top and accommodates the metering device 3, and an inlet passage 7 and an outlet passage 8 which communicate this inner space 4 with an inlet 5 and an outlet 6, respectively, of the metering liquid; Consisting of 9,
The inner space 4 is divided into an inlet side space 10 that communicates the inlet passage 7 and the inlet 1 and an outlet side space 11 that communicates the outlet passage 8 with the inlet passage 7 and the inlet passage 8. A partition wall 12 is integrally formed with the outer case 9.

Compared to a single-box liquid meter, which uses the outer box itself as a measuring device, a double-box liquid meter can be designed so that the rotating parts inside the measuring device 3 are driven evenly from all around, and it can be connected at the time of installation. Outlet 6 and Inlet 5 from the conduit
Although there are advantages in that the measuring device 3 is not affected by the tensile force received via Because the bulkhead was formed in one piece and had a complex shape with many protrusions, the outer box 9 was manufactured by machining bronze casting, which was expensive and required the use of raw materials such as copper and tin. There were concerns about resource availability and price instability.

This idea makes it possible to avoid the use of bronze castings for the outer box 9, which occupies a large part of the cost structure, and instead uses die-cast or plastic molded products mainly made of brass, etc., thereby solving the above-mentioned problems. The purpose is to

This invention is based on the internal space 4 of the outer box 9, as shown in FIG. 2 and FIG.
The inner circumferential wall constituting the inner space 4 has a shape free from obstacles so that a molding core having the same shape as the inner space 4 can be extracted as it is through the upper opening, and the inlet 5 Alternatively, the inner surface up to the outlet 6 is set so that there are no obstacles so that molding cores of the same shape can be extracted as they are through the inlet 5 and the outlet 6, respectively, and the inlet passage 7 and the outlet passage 8 are As shown in FIG. 3, the cross-sectional dimensions of the inner surfaces of each remaining portion gradually expand toward the inner space 4, and a molding core having the same shape as the space surrounded by these inner surfaces extends into the inner space 4. This relates to the shape of the outer box of a multi-box flow meter, which is characterized in that it is designed so that it does not interfere with each other when it moves inward until it fits into the molding core of the internal space 4.

With this structure, there is little sudden expansion or contraction in the cross-sectional area of the liquid flow from the inlet 5 to the internal space 4 and from the internal space 4 to the outlet 6. Therefore, unnecessary pressure loss is small, and the outer box Immediately after the molding, the core 9 for molding the inner surface shape of the remaining portions of the inlet passage 7 and the outlet passage 8, that is, the portions closer to the inner space 4, is placed inside the core for molding the inner surface shape of the inner space 4. The core, which molds the inner surface of the inner space 4 of the outer box 9, and the middle part of both the inlet passage 7 and the outlet passage 8 to the inlet 5 and the outlet 6, can be pulled out without interfering with each other. Simple die-casting or plastic molding in which each core that molds the inner surface shape of a part of the inlet passage and outlet passage can be extracted in its shape in the direction of the upper opening, the inlet 5, and the outlet 6, respectively. Since it can be molded using a mold and the amount of cutting required by machining can be minimized, all of the above-mentioned problems associated with conventional products have been solved.

In the embodiments shown in FIGS. 2 and 3, the partition wall 12 is manufactured by plastic molding integrally with the inner box 13, which forms the main part of the weighing device 3, and has the shape shown in FIGS. 4 to 6. However, the shape shown in FIG. 7 may be used instead.

In addition, as shown by the diagonal lines in FIG.
and exit 6, diagonally downward at an appropriate angle, respectively.
When opening obliquely upward, the partition wall 12 can be formed into a flat plate-shaped mold which is easier to manufacture and cheaper.

Note that the partition wall 12 does not necessarily have to be integrated with the inner box 13, but may be made into a separate body and have a structure in which vertical displacement is restricted by the inner box 13 and the outer box 9 in the assembled state.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a sectional view of an embodiment of this invention, Fig. 3 is an A-A sectional view of only the outer box of the embodiment of Fig. 2, and Figs. Figure 6 is a plan view of the inner box and bulkhead of the embodiment shown in Figure 2, B-
A side view taken along arrow B, a side view taken along line C-C, and FIG. 7 are side views of further embodiments of the parts. 1...Inlet, 2...Outlet, 3...Measuring device, 4...
Internal space, 10... Inlet side space, 11... Outlet side space, 5... Inlet, 6... Outlet, 7... Inlet path, 8... Outlet path, 9... Outer box, 12... Partition wall.

Claims (1)

[Scope of utility model registration request] It consists of an inner box 13 having an inlet port 1 and an outlet port 2, and an outer box 9 in which the inner box is housed in an inner space 4 which has an inlet passage 7 and an outlet passage 8 projecting therefrom and is open at the top. A partition wall separating the inlet side and the outlet side is installed in the outer box 9.
Separately from this, the entire outer periphery is provided in close contact with the inner surface of the inner space 4, and the measuring liquid that flows in from the inlet 5 of the outer box is passed through the inlet 1 of the inner box, the metering device 3, and the outlet 2 of the inner box. In a double-box type flow meter configured to flow out from an outlet 6 of the outer box, a molding core having the same shape as the inner space 4 is inserted through the upper opening of the inner wall constituting the inner space 4 of the outer box 9. The shape is such that there are no obstacles so that it can be removed, and the inlet 5 or outlet 6 is
The inner surfaces of The inner surface shape is gradually expanded as each cross-sectional dimension goes toward the inner space 4, and a molding core having the same shape as the space surrounded by these inner surfaces moves toward the inner space 4, and the inner space 4 is molded. The shape of the outer box of a multi-box flow meter is characterized in that it is designed so that it does not interfere with each other when moved until it fits into the core.