JPS62257035A - Bourdon tube type pressure gauge - Google Patents

Abstract

PURPOSE:To easily adjust accuracy, by a method wherein the chip of a Bourdon tube is allowed to cooperate with a sector through contact connection and an inner machine is moved to change the connection point of both of them. CONSTITUTION:The measuring pressure introduced from the end of the connection screw 1a of a stub 1 is introduced into a Bourdon tube 3 and a connection element 4 performs the displacement corresponding to the measuring pressure. This displacement is magnified by a pinion 8 to drive an indicator. If an adjust screw 2 is operated to be allowed to go in and out with respect to the stub 1, an inner machine frame 5 is shaken around the bend part 5a thereof, and the pinion 8 and sector 10 held to said frame 5 also shake. With this shaking operation, the engagement point of the bent part 4a of the connection element 4 with the groove hole 10b of the extension piece of the sector 10 moves to alter and adjust a magnification ratio.

Description

[Detailed Description of the Invention] Pressure gauges are in wide demand in the industrial world as essential instruments for the maintenance and safety management of various types of industrial and consumer equipment and devices. The main focus is on low product prices and quick delivery times.

However, as Bourdon tube type pressure gauges are used, it is unavoidable that the Bourdon tube undergoes slight changes in characteristics over time due to various factors such as the fatigue effect caused by pressurization, which can cause finger fluctuations. Accuracy control is carried out constantly or periodically in the field, and there is a strong demand for simplification and simplification of management work by those in charge of internal machinery consisting of stocks, Bourdon tubes, pinions, and sectors. During its long history of development, the well-known Bourdon tube type pressure gauge, which uses the pressure gauge as a component, has undergone numerous technical and structural developments and improvements, and has been refined to the point where it is almost at its limit. However, if we look at this in detail, as shown in Figure 1, the Bourdon light A and the sector extension piece B are fixedly connected to each other by a piece C having screws or rivets at both ends. Therefore, to adjust the index, refer to the standard pressure gauge, loosen the screw at one end of the connection, move it through the slot of the sector extension piece, and then tighten again to fix it. Alternatively, the final adjustment point is obtained by repeatedly applying bending deformation to the lid extension piece using a hand tool, which requires experience and skill on the part of the operator and requires a lot of time. Due to various reasons, it is impossible to perform this work while the product is still assembled in the case, and it is a hassle to take out the internal mechanism from the case each time. This is often difficult to do, and the practice is usually outsourced to the manufacturer or specialized repair company.

The present invention pursues ease of accuracy control without being bound by the above-mentioned fait accompli, and uses a novel concept to link the tip of the Bourdon pipe and the sector through tangential coupling, and to move the internal machine to change the coupling point. This solves the issue by making it possible to adjust the accuracy, completely meeting the demands of the pressure gauge usage site, and at the same time, it also has a ripple effect for manufacturers: a reduction in the number of required parts, a simpler structure, and a lighter weight. This reduces parts costs, and simplifies assembly and adjustment, which significantly reduces work man-hours and work time, which greatly contributes to lower product prices, and at the same time enables quick response to delivery dates. Big profits are expected.

An example of the implementation of the present invention will be described in detail with reference to a front view in FIG. 2, a partial sectional view of the stock in FIG. 3, and a side view in FIG. 4.
is a stock with a connecting screw Ia at one end, a Bourdon tube attachment port 1b in the middle, a recessed hole 1c at the other end, and a pressure passage 1d that passes through the tip of the connecting screw and the Bourdon tube attachment hole inside. There is. 2 has a conical adjustment screw at the tip and is attached to the lower part of the recessed hole from the front of the stock.

3 is a bourdon tube whose fixed end is glued to the mounting opening of the stock,
The free end is closed by gluing the advance 3a, and the connector 4 is attached to the advance. The connector is made of a thin metal drawn wire, and has a bent portion 4a at the tip and a curved portion 4b for facilitating the setting of the position of the bent portion. Reference numeral 5 denotes an inner machine frame integrally formed from a thin metal plate, and an extension of the bent part has a semicircular bent part 5a to enable movement of the inner machine frame, and a piece 5b for fixing to the stock. has. 5c is a support piece for maintaining the normal interval on both sides of the inner machine frame with one side of the inner machine frame bent inward;
d is a supporting piece that divides the tip of a similar bent piece into three parts and forms a gap between the ends of the hair spring; 6 has a tapered part at the tip that is fixed to the front of the back of the bent part of the inner machine frame. The conical projection 7 is a mounting screw for the inner machine frame. Numeral 8 is a pinion, and 9 is a hair spring whose center is fixed to the pinion shaft.The end of the hair spring is fixed by being sandwiched between the divided pieces at the tip of the support piece 5d of the inner machine frame and crushed. 10 is the sector that meshes with the pinion, and the extension piece 1 on the other end
0a, there is a bent portion 438 at the tip of the connector 11 along its center line. +7 1 ton of 1 ton of burial mound
AB is pierced. The pinion 8 and the sector 10 are both inserted between a pair of side plates of the inner machine frame 5 and held therebetween.

11 is a pointer driven into the pinion shaft, 12 is a scale plate,
It is fixed to the front of the stock with studs 12a.

Reference numeral 13 denotes a case, which is fixed to the stock from the back side with screws 14, and a protrusion 13a at the center of the case is a stopper that prevents the pinion shaft from moving in the axial direction when driving the pointer into the pinion shaft.

15 is a case lid, and 16 is a transparent plate such as glass held between the case and the case lid.

The operation of the Bourdon tube type pressure gauge according to the present invention is such that the measured pressure introduced from the end of the connecting screw 1a of the stock 1 is introduced into the Bourdon tube 3 from the mounting port 1b of the Bourdon tube via the pressure passage 1d, Therefore, the connector 4 makes a displacement corresponding to the measured pressure, and the displacement is transmitted to the sector because the bent part 4a at the tip thereof is inserted into the slot 10b of the sector extension piece 10a and engaged. Full pinion 8
The process in which the pointer 11 is driven and the measured pressure value is read on the pressure scale on the scale plate 12 at the position of the pointer is the same as that of a known Bourdon tube pressure gauge.

Next, to explain the method of changing and adjusting the magnification rate of Bourdon tube tip displacement, which is unique to the present invention, by operating the adjusting screw 2 and moving it in and out of the stock, the conical part at the tip The inner machine frame is moved up and down against the elasticity of the semicircular bent part 5a by a conical protrusion 6 fixed to the back surface of the bent part of the inner machine frame 5 that is in contact with this, so that the inner machine frame is bent. Since the pinion 8 and the sector 10 that swing around the part 5a and are held there also swing together, the engagement point between the bent part 4a of the connector and the slot 10b of the sector extension piece also swings at 8. The magnification ratio is changed and adjusted by command.

In this case, the pinion 8, that is, the center of the pointer 11 moves, but since the bent portion 4a at the tip of the connector has been given an appropriate position in advance during the manufacturing process, the amount of movement required for adjustment remains extremely small and functions. There is no fear that it will affect the appearance.

As described above, in the Bourdon tube type pressure gauge according to the present invention, the pressure indication can be precisely adjusted in a short time without requiring any skill by simply removing the case cover and transparent plate and operating the adjustment screws in the assembled state. This completely satisfies the need for simplification and ease of precision control at the site where pressure gauges are used, and also allows precise adjustment of the index after assembly is completed, making it easy to assemble and In addition to greatly streamlining the adjustment procedure and reducing the number of man-hours, in the assembly process, the connection between the tip of the Bourdon tube and the sector is achieved by using screws or screws at both ends of the connecting piece. In contrast to fixing with rivets, in the present invention, it is sufficient to simply insert the bent portion of the tip of the connector into the slot of the sector, reducing assembly man-hours and resulting in a simplified component structure and number of components. In addition to the reduction in component costs due to the reduction in the number of parts, it is expected that the total manufacturing cost will be significantly reduced.

The present invention also applies to a structure in which the tip of the Bourdon tubes and the sector are interlocked, in which a piece with a slot is attached to the tip of the Bourdon tube, and a connector is provided in the extension of the sector. The action and effects can be expected.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the connection between the tip of the Bourdon tube and the sector in a known Bourdon tube pressure gauge, Fig. 2 is a front view showing an example of implementation according to the present invention, and Fig. 3 is the stock part. Figure 4 is a side view. A - Bourdon tube tip B - Sector extension piece C Series tie piece

Claims (1)

[Claims] In the internal machine consisting of pinion and sector Insert the connector at the end of the Bourdon tube into the sector slot. Insert the bourdon tube into the tip and sector Configure it so that it works in conjunction with each other, and move the internal machine. Adjust the magnification ratio by This is a Bourdon tube pressure gauge.