JPH0311701Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention A-1 Industrial application field This invention is a flowmeter equipped with a terminal board and an electronic display section for connecting a cord for exchanging signals with the outside of the flowmeter. Regarding improvements.

A-2 Prior Art As shown in Fig. 6, a conventional flowmeter has an electronic display section 2 incorporated and fixed into an indicator case 1, and a lid 3 with a transparent window in front of the electronic display section. A terminal board fixed to the indicator case 1 and connected to a cord for exchanging signals with the outside of the flowmeter was housed in a terminal box 4 fixed to the side of the indicator case 1. 5 is a flow metering section.

Further, as shown in FIG. 7, a printed wiring board 6 is housed and fixed in the indicator case 1, and a terminal board 7 is attached to this board.
and an electronic display section 2 were fixed, and a lid 3 having a transparent window 8 was fixed to the front of the indicator case 1 with screws.

A-3 Problems to be solved by the present invention In the above-mentioned conventional technology, in order to protect the electronic display section 2 using a heat-sensitive liquid crystal, it is necessary to take heat insulation measures between it and the flow metering section 5 through which high-temperature fluid flows. There was a problem.

Further, in the prior art shown in FIG. 6, since the terminal box 4 is fixed to the outside of the indicator case 1, there is a problem in that it is difficult to reduce the size and weight of the terminal box 4.

Furthermore, in the prior art shown in FIG.
Since the cord is built into the terminal board, there is a problem in that the electronic components of the electronic display section 2 may be damaged when connecting the cord to the terminal of the terminal board.

B. Structure of the invention B-1. Means for solving the problems This invention, as a means for solving the above problems, includes a case that is fixed integrally with the flow metering section, and a case that is opposite to the flow metering section of this case. The present invention is characterized in that a lid is provided that is joined to the sides with a hinge and has a display window, a terminal board is housed and fixed in the case, and an electronic display section is fixed to the lid.

RO-2 Embodiment FIGS. 1 to 3 show an embodiment in which this invention is applied to a twin rotor type flowmeter, in which 9 is a flow metering section, a metering section case 10, a shaft 11 press-fitted and fixed thereto, 1
1, the rotors 12, 12 which are loosely connected to this, the permanent magnet 13 attached to one of the rotors, and the O-ring 1.
4, and a partition wall 16 fixed to the measuring part case 10 with bolts 15.

17 is a case of the indicator, 18 is a printed wiring board fixed with screws near the bottom of the case 17,
A terminal board 19 is fixed to the front surface of this board with screws. 20 is a battery stored in case 17, 21
Reference numeral 22 denotes a cord connecting the battery to the substrate 18, and 22 a magnetic sensor fitted into a recess provided on the rear outside of the bottom surface of the case 17, which is connected to the substrate 18 by a cord 23. Reference numeral 24 denotes a relay fixed to the board 18, which receives a control signal from an arithmetic circuit of an electronic display section, which will be described later, and produces an output signal to an external operating end.

25 is a lid equipped with a transparent display window 26;
As shown in the figure, the left end is connected to the front left end of the case 17 by the hinges 27, 27, and can be opened and closed, but cannot be separated. Note that FIG. 3 shows a state in which the lid 25 is opened 90 degrees. Normally, this lid 25 is attached to the case 17 with a screw 28 at the right end of the lid 25, as shown in FIG.
It has a semi-fixed structure so that the screw 28 must be removed to open the lid.

29 is an electronic display unit fixed to the lid 25, as shown in FIG.
The display section 31 is arranged facing the display window 26. 32 is a panel switch, which has push buttons 33, 34, and 35 as shown in FIG.
By pressing these buttons, you can switch the display, perform external output, etc. 36 is a plate attached near the rear end of the lid 25, as shown in FIG. 1, which covers and protects the electronic display section 29.

The board 18 is connected to the arithmetic circuit 30 of the electronic display section 29 by a connection cord 37, and the flow pulse detected by the magnetic sensor 22, which detects the rotation of the permanent magnet 13 that rotates together with the rotor, and the electric power from the battery 20 are transmitted to the electronic display section. 29, and the relay 24 receives a control signal from the arithmetic circuit 30 of the electronic display section.

Reference numeral 38 is a cord intake port, into which a cord for exchanging input/output signals between the flowmeter and the outside is drawn in. When the cord is not connected, a dustproof cap 39 is inserted as shown in Figure 1. put.

The case 17 has a cylindrical bottom outer periphery and is provided with an annular groove. This bottom part is fitted into the partition wall 16 of the flow metering part 9 as shown in FIG. Since it can be rotated both clockwise and counterclockwise in the figure, the orientation with respect to the flow metering section 9 can be changed to a direction that is easy to use.

The display section 31 displays the cumulative flow value, the zero reset cumulative measurement value, the instantaneous flow value, etc.

When installing the cord (input/output line) 41 that is connected when exchanging signals such as remote pulse output, external control terminal output, and power input with the outside, remove the cap 39 and insert the waterproof cap 4 into the cord intake port 38.
2, the cord 41 is drawn into the case 17 by passing through it, and its end is connected to the terminal of the terminal board 19. When performing this connection work, remove the screw 28, open the lid 25 as shown in Figure 3, and
By performing from the front of the flowmeter, code 41
can be connected without touching the electronic display section 29.
Also, when replacing the battery 20, the lid 25 can be opened in the same manner.

FIG. 5 shows an embodiment in which this invention is applied to an impeller type flowmeter, in which the flow metering section 9 is connected to the metering section case 43.
, the intercase 44, the O-ring 14, the bolt 15, the lid 16, the pivot 45 set on the bottom of the intercase 44, the impeller 1, and the permanent magnet 46 fixed to the front end of the impeller's rotating shaft. The rotation of the impeller 1 is detected by the magnetic sensor 22 and transmitted as a flow rate pulse to the arithmetic circuit of the electronic display section 29. This embodiment differs from the previous embodiment only in the structure of the flow metering section 9.

Note that the flow metering section is not limited to the above embodiment, and a turbine type or other type based on another principle may be used.

C. Composition of the device The lid that holds the electronic display unit is fixed to the case, making it easy to open and close the lid. In addition, when connecting wires to the terminal board, the lid can be opened and connected easily. Since the electronic display section and the terminal board are located apart from each other, accidents that damage electronic components can be prevented.

Furthermore, since the electronic display section is disposed at the farthest position from the flow metering section, the electronic components can be protected from the heat of the high temperature fluid flowing through the flow metering section.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of this invention.
The figure is a vertical side view, Figure 2 is a front view, Figure 3 is a front view with the lid open 90 degrees, and Figure 4 is a vertical side view with the cord connected to the outside connected to the terminal board. Figures 5 and 5 are longitudinal sectional side views of other embodiments, and Figures 6 and 7 are perspective views of different prior art flowmeters, with Figure 7 showing the state with the lid removed. 9...Flow rate measuring section, 17...Case, 19...Terminal board, 25...Lid, 26...Display window, 27...Choice pair, 29...Electronic display section, 41...Code.

Claims (1)

[Scope of utility model registration request] In a flowmeter that has a terminal board for connecting a cord for exchanging signals with the outside of the flowmeter and an electronic display section, there is a case fixed integrally with the flow metering section, and a case opposite to the flow metering section of the case. A flowmeter characterized in that a lid is provided with a lid that is joined with a hinge on the side thereof and has a display window, a terminal board is housed and fixed in the case, and an electronic display part is fixed to the lid.