JPS6325389A - Flow and pressure control device - Google Patents

Abstract

PURPOSE:To enable the pressure, under which a pump is operated, to be held nearly constant whether the amount of flow is large or small, if the flow quantity is not smaller than a prescribed value by utilizing the combined operation of the flow reactive part and pressure reactive part of a flow and pressure control device and the common contact point part which are driven by the two reactive parts as mentioned above. CONSTITUTION:When the amount of flow of a fluid, which flows in through an inflow port 1A, is small, a resistance plate 7 in the flow reactive part F is in a state as indicated in the full line, and hereupon, by means of a quick acting member 12, the contacts 26, 27 in a common contact point part C break. When the amount of flow is not smaller than a prescribed value, the resistance plate 7 changes to a state as indicated in the dotted line, and a quick acting plate 5 is in a state where it ascends to the left, and then, the operation of the No.1 moving contact plate 29 causes the contacts 27, 26 to open, and subsequently, whether the contacts 26, 28 open or break by means of a pressure reactive part P, the contacts 25, 27 keep a closed circuit state. Therefore, a pump continues to operate under a nearly constant pressure in response to the amount of flow in service without the need of taking the pressure difference between the opening and closing into consideration, and accordingly, the pulsative pressure fluctuation at the service space can be prevented from taking place.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a one-in-a-flow pressure control device for controlling a water supply system, particularly for automatically operating a pump according to flow rate and pressure.
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Conventional technology and problems Conventional pressure (pressure switch is set to 0) A single-digit pump operation method requires a considerable opening/closing pressure difference in order to reduce the amount of time required for operation. The pressure in
The pump starts and the pressure rises to 7? C, flow rtf 71'
J! '! As the pump increases, the water temperature decreases, and then when the pump stops, the water temperature rises. Alternatively, there were many cases where it was inappropriate to use a fire hydrant pump, such as a 4F where the water pressure fluctuated at the BK water location.

So with the FE power switch! A method is used in which a meteor switch is connected to IQ 911 for one cycle, and when the flow uC exceeds a certain value, the flow rate switch is closed and the pump continues to operate, regardless of the Fl force value. (However, the amount of water used is very small,
In other cases, such as water leakage, the flow rate switch remains closed and the pressure switch opens and closes at long intervals to prevent the pump from operating. ) However, using a 2V system that requires a complex and large flow rate switch and pressure switch is expensive, requires a large installation space, and is inconvenient from the viewpoint of maintenance.

Means for Solving the Problems Therefore, the present invention provides a flow rate response section, a pressure response section, and a common contact section driven by both of these response sections as an integrated structure, and the second contact section has an opening/closing capacity. As a large two-pole contact point, the pump can be opened and closed directly without using a relay or the like, thereby solving the above-mentioned problems.

In other words, each movable contact plate is installed in an inverted U-shaped conduit and has a flow rate responsive part such as a resistance plate that rotates according to the flow rate, and a pressure responsive part that detects the main force of the conduit. The movable contact is moved toward and away from the common fixed contact in four directions.

Examples and their effects An embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

1 is a base forming an inverted U-shaped conduit from the inlet mill 1A to the outlet 1B, 2 is the base, 3 is a mounting plate made of an insulating material, 4 is a cover, 1: is a flow rate responsive part, P is a pressure responsive part Section C is a contact section.

Flow response part F1. , 5 is a fast-moving plate that is pivoted by a support plate 6, and 7 is fixed to the fast-moving plate 5 at each end via a gasket 8, and rotates according to the flow rate at the bend of the inverted U-shaped pipe. 9 is a spring holder that is inserted into the free end of the moving plate 5 and presses the kick lever 11 via a compression spring 10; 12 is a roughly T-shaped moving body made of an insulating material; and 12 is a convex portion 12A in the middle of the vertical side. is pivotally supported in the concave portion of the stopper plate 13, and has convex portions 12B at both ends of the lateral sides, respectively.
and facing the second movable contact plate 29 to be described later,
It moves quickly according to the rotation of.

Next, in the pressure-responsive part P, the left side of the line X-X in FIG.
15 is a plunger X7 which holds the lever 17 together with the lower spring receiver 16; 18 is the upper spring receiver 19 is the first adjustment screw; 20
21 is an adjustment spring, and 21 is a quick-acting lever whose upper limit neck is regulated by a second adjustment screw 22 and a leaf spring 23 is elastically disposed between it and the lever 17.

In the contact portion C, 25 is a pair of fixed contact plates provided with a fixed contact 26, 27 and 2B are movable contacts that come into contact with and separate from the contact portions on both sides of the fixed contact 26, respectively, and 29 and 30 are movable contacts 27 and 26, respectively. These are a pair of first and second movable contact plates each having a diameter of σ28 and fixed to the mounting plate 3 with a valve as a common terminal. The first movable contact plate 29 resists its own elasticity.
Driven by the movement of the lateral convex portion 12B of the fast-moving body 12 of the flow-♀ responsive portion F, the i+] moving contact 27 is opened and closed from the fixed contact 26. Further, the connecting plate 31 that connects the tip of the second movable contact plate 30 is driven by the quick-acting lever 21 of the YF force responsive part P, and the contact 25.2B is opened and closed in the same manner as a conventional pressure switch.

Therefore, the resistance plate 7 of the small 11.1 of the flow 1~, the flow rate response part 1: is that! f! 3, the free end is lowered as shown by the solid line in FIG. The contact plate 29 is pressed against its own elasticity to open the contacts 26 and 27.

When the flow rate increases here, the resistance plate 7 is rotated counterclockwise as shown by the dotted line in the same figure, and the tip of the fast-moving plate 5 and the key
- The knob 11 compresses the spring 10 and moves quickly to the left, rapidly changing the fast moving body 12 into an upward-left shape and tightening the convex portion 1 on its side.
2B, the first movable contact plate 29 brings the movable contact 27 into contact with the fixed contact 26 by its elasticity. After that, the contact point 26.28 I by the pressure responsive part P
? Irrespective of the separation, the flow rate response section F continues the closed state of the contacts 25 and 27 for 15 days until the flow rate decreases and the resistance plate 7 returns to its old state.

Next, another embodiment shown in FIG. 5 will be described.

A fan n-1-32 provided in the conduit so that it can be raised and lowered moves up and down in response to the flow, drives the resistance plate 7, and
It opens and closes the contacts. That is, if the flow rate exceeds a certain value, the foot 32 will move and push the resistor plate 7 in a direction opposite to that shown in the figure.
1.) Close the contact by rotating it in the clockwise direction.
Maintains contact closure.

Effects of the Invention According to the present invention, there is no need to take into account the difference in opening and closing pressure in which the flow rate responsive contact continues to close when the flow rate is above a certain value, regardless of whether the pressure responsive contact is opened or closed. Since the pump continues to operate at a substantially constant pressure depending on the flow rate used, pulsating pressure fluctuations at the place of use are prevented and the full capacity of the pump is utilized.

The flow rate response section can set the flow rate to be responded to in advance by, for example, selecting the thickness and specific gravity of the low resistance plate 7, or by drilling an appropriate hole.

When the flow rate exceeds a certain value, this resistance plate 7 comes into close contact with the upper surface of the U-shaped pipe, as shown by the dotted line in Figure 1, and hardly becomes an obstacle to the flow, thereby avoiding loss.

However, the present invention not only has the functions of a conventional flow rate switch and a pressure switch, but also allows direct control of not only medium-phase but also three-phase pumps using a common pair of contacts, without using relays, etc. The installation space and cost, as well as the number of T-pieces for storage, can be made extremely small.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a central vertical sectional front view, FIG. 2 is a right side view, and FIG. 3 is a planar view taken along the line 3-3 in FIG. , FIG. 4 is an exploded perspective view of the main parts, and FIG. 5 is a partially cutaway front view of another embodiment. F: Flow rate response section, 1] Two pressure response section, C: Contact section. 5: Speed plate, 6: Temporary support, 7: Resistance plate, 8: Packing,
9: Spring holder, 10: Compression spring, 11: Kitop, 12:
Fast moving body, 26: Fixed contact, 27.28 = Movable contact, 29
: First movable contact plate, 30: Second movable contact. Patent applicant Yamada Electric Manufacturing Co., Ltd. Representative Yamaguchi] Jin'Vj2 Figure 'J) E Figure χ4 Figure 3 Q

Claims (3)

[Claims] (1) A flow rate pressure control device consisting of a flow rate response section, a pressure response section, and a common contact section driven by the flow rate response section and the pressure response section. (2) The contact portion includes a pair of fixed contacts having contact portions on both sides, and a movable contact that contacts and separates from one surface of each fixed contact,
a pair of first movable contact plates driven by the flow rate responsive section;
It is equipped with a movable contact that approaches and separates from the other surface of each fixed contact, and a pair of second movable contact plates that are driven by a pressure responsive part, and the base ends of the first and second movable contact plates are connected to a common terminal. A flow rate and pressure control device according to the attached claim (1). (3) The flow rate responsive part has a pivotable quick-moving plate fixed to the base end of a resistance plate that rotates depending on the flow rate via a packing, and a compression spring attached to the other end of the quick-moving plate. The cap is attached, and the pivoted vertical side of a fast-moving body having a roughly T-shape and having both horizontal sides acting on the tip of the first movable contact plate is rapidly driven by the tip of the cap. A flow rate pressure control device according to claim (1) or (2).