JP2509491Y2 - Flow detection type lift valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention utilizes a space above a valve plate to provide a magnet piece between the tops of columns that are juxtaposed above the edge of the valve plate. The present invention relates to a lift valve that electrically accurately detects a degree of opening due to lift of a valve body in a valve, that is, a flow rate in the valve, by a sensor provided in the valve. Specifically, a magnetic field sensitive current switch (sometimes referred to as a sensor below) and a magnet piece that interlocks with the valve plate are effectively installed in a narrow space inside the valve. Relates to a lift valve that detects whether the valve is operating at a predetermined opening degree by the magnet piece and the current switch installed in the valve. Preferably, it further relates to the lift valve, wherein the operating point of the switch is continuously adjustable from outside the valve.

[Prior Art and its Problems] As a flow rate detector, a valve using a magnetic field sensitive current switch such as a reed switch in which reed pieces of a magnetic material are partially overlapped at a distance is known. For example, a structure is known in which a magnet piece is installed on a movable valve body and a reed switch is installed at a corresponding position in the valve. The reed switch has a mechanism in which the magnetic reed pieces existing in a separated state are magnetized contact with each other to energize when the magnetic field becomes strong (when the magnet body approaches). Generally, such a magnetic field sensitive type current switch has a structure in which an electric circuit is closed or opened according to a change in a magnetic field.

In a conventional lift valve with a sensor, a magnet piece is mainly installed on the upper part or the lower part (for example, 10 or 11 in FIG. 1) of the valve rod 9. This mode is inconvenient because the sensor body needs to extend through the center of the valve body, and there is a big problem in manufacturing and accuracy particularly as the valve diameter increases.

The present inventors have also studied a mode in which the magnet pieces 7 are attached to the upper edge portion 16, the lower edge portion 18 or the side end portion 17 of the valve plate 6 and the sensor is attached to the corresponding position of the magnetic force line. However, the position of the upper edge portion 16 of the valve plate is generally inconvenient because there are problems in the installation position of the sensor body and the movement of the valve plate.
The position of the side edge 17 of the valve plate was generally inconvenient due to the low sensitivity of the sensor and unstable sensor accuracy.

Furthermore, the upper portion 10 and the lower portion 11 of the valve rod 9 and the lower edge of the valve plate 6
When mounting the magnet pieces at the 18th position, an extra space in the valve for installing the sensor at the corresponding position is required, and there is a drawback that the valve is inevitably lengthened. Therefore, there is also the problem of incompatibilities with parts of conventional valves that do not have sensors.

[Means for Solving Problems] The present inventors have proposed a lift valve in which a valve plate is opened by a fluid flowing through the valve, as illustrated in FIGS.
A magnet piece 7 is fixed between the tops of two pillars that are fixed to the edge of the valve plate 6 of the valve body 2 and are juxtaposed in the upward direction of the valve plate edge at the width interval of the magnetic field sensitive current switch device. The above-mentioned problems are solved by a structure in which the switch device 3 is fixedly provided and slidably installed between the pillars below the magnet pieces.
In addition, since the support column moves across the switch device according to the movement of the valve body, the valve body does not rotate, and the magnet piece is always present immediately above the switch device.

The switch device 3 may have a structure in which the magnetic field sensitizing piece 4 (for example, a reed switch) is installed substantially on the center line in the extension direction. The switch device 3 may have a structure integrated with the switch case 5 from the beginning, and the switch case 5 installed at a required position on the side of the valve box 19.
The structure may be such that the switch device 3 is inserted therein.
The switch device 3 is installed by being inserted into a mounting hole 20 provided on a side portion of the valve box 19 preferably through a packing 21. In this case, by making the mounting means a screw type or a sliding type, the switch device is moved in its extension direction (for example, in the valve outward direction) to adjust the distance between the sensitizing piece 4 and the magnet piece 7. Then, by fixing with a set screw or the like, the operating point of the switch device 3 with respect to the opening of the valve plate 6 can be continuously finely adjusted.

According to another aspect of the present invention, as illustrated in FIGS. 3 to 4, the switch device 3 is biased from the center line of its extension direction (for example, about 1 to 5 mm) and the magnetic field sensitizing piece 4 ( For example, a reed switch) may be installed.
In this case, the switch device 3 may be rotatably (for example, about 180 degrees) inserted into the switch case 5 installed by being inserted between the side portions of the valve box 19 and the columns 8 in the valve. it can. In this way, the switch device 3 in the case 5 is rotated to adjust the distance between the sensitizing piece 4 and the magnet piece, and is fixed by the set screw 14 so that the operating point of the switch device 3 is further increased. It is possible to fine-tune effectively continuously. A side sectional view of the switch device 3 of this aspect is illustrated in FIG. 3, and a front sectional view thereof (arrows indicate a rotation direction) are illustrated in FIG.

In the sectional view of FIG. 1, the valve plate 6 is usually a spring.
It is pushed downward by 22 and is seated on the valve seat 23, and a fluid such as water flows in from below the valve to guide the valve body 2 to the guide 12 and
Push up along 13. Depending on the amount of water flowing in, the valve plate 6 rises and the magnet piece 7 at the top of the strut 8 connected to the valve plate separates from the sensitizing piece 4 of the switch device 3.
When the distance between the sensitizing piece 4 and the magnet piece reaches a predetermined distance,
Since the switch device 3 is adjusted to operate, the opening degree of the valve plate 6, that is, the flow rate of the fluid is easily detected by the electric signal from the conductive wire 15 of the switch device.

[Operation and Effect] According to the present invention, two columns 8 standing in parallel are set up on the upper edge of the valve plate 6 of the lift valve, and the magnet piece 7 is provided between the tops of the columns.
A switch device (sensor) 3 is slidably installed between the columns. Therefore, the following representative actions and effects are effectively achieved.

(1) The opening degree of the valve body is the distance between the magnet piece and the sensor as it is, and since the sensor is inserted between the two columns, the valve body does not rotate and the magnet piece is always directly above the sensor. Therefore, the opening degree of the valve body can be detected accurately.

(2) Even in the case of a large-diameter valve, a relatively short sensor device can be used and the accuracy is improved.

(3) Since the sensor component is installed by utilizing the space above the valve plate in the valve, no special space for that is required. As a result, the valve is relatively small and the standards and components of conventional valves that do not have a sensor can be substantially employed.

(4) Since the space for installing the sensor component is a large space in the valve, the resistance of the sensor component to the fluid passing through the valve is negligible, and the performance of the valve is not substantially reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view illustrating a valve of the present invention. Second
The figure is a side view showing the valve body, the columns that stand side by side, the magnet pieces, and the switch device. FIG. 3 is a cross-sectional view of a preferred switch device used in the present invention in an extension direction. FIG. 4 is a cross-sectional view of the switch device of FIG. 3 in a direction orthogonal to the extension direction. 1 …… lift valve; 2 …… valve element; 3 …… switch device; 4 …… sensitizing piece; 6 …… valve element; 7 …… magnet piece; 8 …… pillar.

Claims (3)

(57) [Scope of utility model registration request] 1. A lift valve having a magnet piece mounted on a movable valve body and a magnetic field sensitive current switch device installed at an operating position in the valve corresponding to the movement of the magnet piece;
Two columns 8 fixed to the edge of the valve plate 6 of the valve body 2 and standing in parallel with the width of the switch device are provided in an upward direction of the edge of the valve plate, and the columns 8 stand in parallel. A magnet piece 7 is fixedly provided between the tops of the switch and the switch device 3 between the pillars.
A flow detection lift valve featuring a structure that is inserted and installed from the side of 19. 2. The switch device 3 has a structure in which a magnetic field sensitizing piece 4 is installed substantially on the center line in the extension direction, and the switch device 3 is moved and fixed in the extension direction with respect to the opening of the valve plate 6. The lift valve according to claim 1, which has a structure for adjusting an operating point. 3. The switch device (3) is rotatably inserted in a switch case (5) inserted and installed in a valve, and its magnetic field sensitizing piece (4) is installed eccentrically from the rotation center of the switch device (3). The lift valve according to claim 1, wherein the position of the sensitizing piece 4 is continuously adjusted by rotationally fixing the switch device 3 and the operating point for the opening of the valve plate 6 is adjusted.