JPS601479Y2 - pressure switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure switch that uses a spiral-shaped Bourdon tube made by winding pipe materials concentrically with different diameters, has excellent durability, and operates accurately even under extremely high pressure.

That is, the present invention has a spiral-shaped Bourdon tube made by winding thin pipe materials concentrically with different diameters, and has a pressing lever with a protrusion protruding from the tip thereof, and also faces the Bourdon tube and is swingable. A limit switch for detecting the set pressure using an electric signal and a lever for operating the switch are provided on the swing frame, and the swing frame is fixed to the shaft of the knob with a pointer so as to adjust the swing according to the set pressure. The gist is that it contacts the cam and adjusts the set pressure.

The following description will be made based on the illustrated embodiment.

In the figure, 1 is a base installed in the case or gate of the switch, and a stock 2 connected to a pressure source is fixed to this base 1, and a flat pipe material or pipe material of different diameters is concentrically spirally connected to this stock 2. A bourdon tube W3 formed by winding a plurality of times into a spring shape is integrally provided, the tip of this bourdon tube 3 is closed, and one end of a pressing lever 4 is provided at the tip.

This pressing lever 4 may be welded to the tip of the Bourdon tube, but as shown in the figure, it is fixed by sliding it in a long hole 4a made in the pressing lever through a fixed pole (B) so that its protrusion amount can be adjusted. As a result, the pressure introduced into the Bourdon tube reduces the degree of fatigue per unit of the Bourdon tube, and at the same time, the required amount of displacement is achieved at the tip, and the pressing lever 4 moves the Bourdon tube according to this amount of displacement. It is made to swing using the pivot point with the tip as a fulcrum.

The amount of winding of this spiral-shaped Bourdon tube is such that when the pressure is applied to the Bourdon tube from the preset maximum allowable pressure to the minimum pressure, the tip of the Bourdon tube will be displaced by a preset amount of displacement that will enable the switch. , is determined so that the pressure change can be detected.

Further, a shaft 5 is installed in the base 1, and a swing frame 6 is swingably supported on the shaft 5.
is constantly pressed toward the pressing lever by a spring 15.

The swing frame 6 is provided with a limit switch 9 for extracting the set pressure as an electric signal and a lever 8 for turning the limit switch ON and OFF.

The lever 8 has one end pivotally attached to the swing frame by a pin, the other end facing the operating piece of the limit switch, and the lever 8 being adjustable and protruding from the push lever 4. It is pressed by a screw-type protrusion 7.

Further, the base 1 supports a pressure setting shaft 12 via the base and a shaft support frame 16, and this shaft 12 is provided with an operating knob 11, a pointer 14 indicating the set pressure, and a cam 10. A cam follower 13 is provided on the swing frame so as to come into contact with the outer peripheral surface of the swing frame.

A scale plate is provided inside the pressure case, and by turning a knob for operating the set pressure, the pointer 14 moves above the scale plate to indicate the required pressure.

In the pressure switch configured as described above, when pressure is applied to the spiral-shaped Bourdon tube 3 via the stock 2, the displacement per unit of the Bourdon tube 3 due to this applied pressure is at least as small as the tip of the tube. The amount of displacement is sufficient to operate the switch.

This amount of displacement causes the pressing lever 4 to swing.

At this time, if the high pressure to be detected is set in advance by rotating the knob 11, the cam 10
swings about the shaft 5 as a fulcrum and is held at a set position by a cam 10, which determines the distance between the threaded projection 7 of the pressing lever and the lever 8.

This set pressure is also indicated by a pointer 14.

When the pressure applied to the Bourdon tube reaches a set pressure, the Bourdon tube is displaced corresponding to the applied pressure, which pushes the protrusion 7 toward the lever 8 side via the pressing lever 4 and pushes the waist lever 8.

If the set pressure is not reached, the amount of displacement of the Bourdon tube will be small and the lever 8 will not be pressed by the projection.

When the lever 8 is pressed, a limit switch is operated and an electric signal is generated to detect that the set pressure has been reached.

The cam rotates as the knob rotates, thereby allowing the set pressure to be determined arbitrarily.

With this invention, the displacement of the applied pressure is carried out by a spiral-shaped Bourdon tube made of long pipe material concentrically wound with different diameters, so it can withstand high pressure, and even with a small amount of displacement per unit, the displacement of the tip of the tube can be reduced. Because it can hold a large amount, it has excellent durability and is suitable for use as a pressure switch for high pressure and ultra-high pressure.The set pressure can be set arbitrarily and easily while visually checking just by operating the setting knob.Moreover, the configuration is simple, there are few failures, and it is accurate. It has advantages such as being suitable for pressure switches.

[Brief explanation of the drawing]

FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a plan view. 1...Base, 2...Stock, 3...Bourdon tube, 4...Press lever 5...
Shaft, 6... Swing frame, 7... Protrusion, 8... Lever, 9... Limit switch, 10... Cam, 11... Knob, 12... Axis, 13... Cam follower, 14... Pointer, 15... Spring, 16
...Shaft support frame, B...Bolt.

Claims (1)

[Scope of utility model registration request] A spring-like Bourdon tube made by winding thin pipe material several times concentrically with different diameters has a pressing lever protruding from the tip thereof with a protrusion capable of adjusting six screws, and is opposed to the pressing lever,
A swinging frame is provided on the base to which the Bourdon tube is fixed, and a limit switch for detecting the set pressure using an electric signal is fixed to this frame, and a lever for operating the switch is brought into contact with the tip of the protrusion. A pressure switch is provided in which the swing frame is swingably provided, and the swing frame is brought into contact with a cam fixed to the shaft of a knob with a pointer so as to adjust the swing to adjust the set pressure.