JPS6316995Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a diaphragm type pressure detector.

Generally, a diaphragm-type pressure sensor for detecting differential pressure or pressure in a process is constructed as shown in FIG. In addition, in this specification,
The pressure detector is a general term for differential pressure detectors and pressure detectors. In the figure, reference numeral 1 denotes a diaphragm-type pressure sensor, and this pressure sensor 1 is fitted into a side wall 2 of the process. The side wall 2 is formed in a cylindrical shape at the mounting portion of the pressure detector 1, and serves as a fitting portion 3, and the outer end portion is formed in a flange shape.
It is flange 4. Further, the pressure detector 1 is composed of a mounting plate 5 and a pressure detector main body 6 that is provided integrally with the mounting plate 5. The mounting plate 5 is a disk-shaped member, and is integrally attached to the flange 4 with bolts 7 and nuts 8, and a capillary reach tube 9 passes through the center thereof. The pressure detector main body 6 includes a cylindrical portion 10,
It is composed of a pressure receiving diaphragm 11 and a partition wall 12. And the pressure receiving diaphragm 11
is integrally attached to the tip of the cylindrical portion 10, and a partition wall 12 is integrally provided to the cylindrical portion 10 in parallel to the pressure diaphragm 11 near the mounting plate 5. A hole 13 is bored in the center of the partition wall 12, and this hole 13
The capillary reach tube 9 is integrally connected to the capillary reach tube 9. In this capillary reach tube 9, the cylindrical portion 10 and the pressure receiving diaphragm 11.
A sealing liquid that transmits pressure is sealed in the area surrounded by the partition wall 12.

However, in the pressure detector 1 configured as described above, the following inconvenience occurs. That is, components during the process adhere to the space between the pressure detector 1 and the fitting part 3 of the side wall 2 and to the pressure receiving diaphragm 11 and its vicinity. It may become difficult to attach and detach, or the movement of the pressure receiving diaphragm 11 may be obstructed, resulting in insufficient detection of differential pressure or pressure. Therefore, in order to eliminate these inconveniences, conventional methods have been to finish the contacting surfaces of the fitting part 3 and the pressure detector 1 as smooth as possible to minimize the play between the fitting part 3 and the pressure detector 1. , to prevent deposits from entering.

However, even if the measures described above are taken, the above-mentioned disadvantage that components during the process adhere to the pressure-receiving diaphragm 11 and its vicinity has not been solved at all. In addition, although some effect can be expected in preventing deposits from forming between the fitting part 3 and the pressure detector 1, deposits will accumulate little by little over a long period of time, and as described above, This makes it difficult to attach and detach the fitting part 3 and the pressure detector 1. In addition, the fitting part 3 and the pressure detector 1
It is difficult to finish the surfaces that come in contact with each other smoothly and requires a lot of man-hours, resulting in an increase in manufacturing costs. Furthermore, it is difficult to increase the precision of the inner diameter dimension of the fitting part 3 and the outer diameter dimension of the pressure sensor 1, which similarly requires a lot of man-hours and increases manufacturing costs.

This idea was devised in view of the above circumstances, and its purpose is to create a cleaning device that can clean and remove components that adhere during the process before they cause various problems. The purpose of the present invention is to provide a pressure sensor equipped with a cleaning device that cleans between the pressure detector and the fitting part of the process side wall, as well as the pressure receiving diaphragm of the pressure sensor and its vicinity. By providing the pressure sensor between the joint and the pressure sensor and inside the pressure sensor, the pressure sensor can be cleaned when necessary without removing the pressure sensor from the side wall.

This invention will be explained below with reference to the drawings. 2 to 4 show an embodiment of this invention. In the figures, the same reference numerals as in FIG. 1 indicate the same constituent elements, and the explanation thereof will be omitted. In the figure, reference numeral 20 indicates a pressure detector according to this invention, which is fitted and attached to the side wall 2 of the process similarly to the pressure detector in FIG. The pressure detector 20 includes a pressure detector main body 22 having a pressure receiving diaphragm 21 at the tip on the process side;
It is provided between the mounting plate 23 integrally attached to the pressure detector body 22 and the flange 25 of the fitting part 24 of the side wall 2, and cleans the gap G between the fitting part 24 and the pressure detector 20. Fitting gap cleaning device 2
6, and a pressure receiving diaphragm cleaning device 27 that is provided in the pressure detector 20 and cleans the pressure receiving diaphragm 21 and its vicinity.
Furthermore, the fitting part 24 of the side wall 2 has a gap between the process and the flange 25 of the conventional fitting part 3 (the first
Figure) It is shorter and has a slightly enlarged diameter. The external dimensions of the pressure detector 20 are the same as the conventional one, but as mentioned above, the fitting part of the side wall 2 has a larger diameter than the conventional one, so there is a gap between the fitting part 3 and the pressure detector 20. Although the gap G is expanding,
This is to ensure a space in which the fitting gap cleaning device 26 is installed, and to allow the cleaning agent to easily flow into the gap G to facilitate cleaning of the gap G. Next, each component of the pressure detector 20 will be explained in detail.

First, the fitting gap cleaning device 26 is formed into a ring shape as shown in FIGS. The center of the inner peripheral edge of the cleaning agent introduction/spouting part 28 forms an annular groove 31 that is continuous along the peripheral edge. An introduction hole 32 is bored from this annular groove 31 toward the outer circumferential surface 28a of the cleaning agent introduction/spouting part 28, and a cleaning agent introduction tube (Fig. (not shown) are threaded so that they can be screwed together. Further, the inner diameter of the cleaning agent introduction/spouting part 28 is the same as that of the annular groove 31.
There is a slight difference between the flange portion 33 and the flange portion 34 that form the flange portion, and the inner diameter of the flange portion 34 is larger than that of the flange portion 33 . The tip of this flange portion 34 is formed in a tapered shape so as to expand in diameter from the inside of the cleaning agent introduction/spouting portion 28 toward the outside. The inner diameter of the flange portion 33 is approximately the same size as the outer diameter of the pressure detector main body 22. Therefore, as shown in FIG.
is narrowed to form an injection section 35.

Next, the pressure sensor 20 includes a cylindrical portion 36 and a partition wall 37 that are connected together, and a partition wall 3
The pressure receiving diaphragm 21 is integrally attached to the partition wall 7, and a mounting edge portion 38 is screwed to the partition wall 37. The cylindrical portion 36 is formed in a cylindrical shape, and as described above, is integrally connected to the mounting plate 23 on one side and to the partition wall 37 on the process side. Bulkhead 3
7 is a partition wall 12 of the conventional pressure detector shown in FIG.
The capillary reach tube 9 is formed to be thicker than the partition wall 12, and the capillary reach tube 9 is integrally connected to the central portion, similar to the partition wall 12. Further, the central part of the partition wall 37 on the process side is bored to a large diameter, and the pressure-receiving diaphragm 21 is placed along the partition wall 37 in the center of this bored part.
are integrally attached. The sealing liquid is sealed in the portion surrounded by the pressure receiving diaphragm 21 and the partition wall 37 and in the capillary reach tube 9, as in the conventional case. Further, the outer peripheral edge of the partition wall 37 on the side of the fitting portion 24 is notched in a complicated manner, and a notch portion 39, a notch groove 40, and a notch edge 41 are formed. The notch 39 is machined with a male thread,
A mounting edge 38 is threadedly attached. As shown in FIG.
and an annular locking protrusion 43 that is integrally provided inside one end of this cylindrical body 42,
The inside of the other end of the cylindrical body 42 is internally threaded.
Then, as shown in FIG. 2, the mounting edge 38 is screwed into the notch 39, and the locking protrusion 43
It is locked in.

Finally, the pressure receiving diaphragm cleaning device 27 will be explained. This pressure receiving diaphragm cleaning device 27
As shown in FIG. 2, it is composed of a cleaning agent introduction pipe 44, a cleaning agent distribution pipe 45, a cleaning agent distribution hole 46, a cleaning agent reservoir 47, and a plurality of nozzle holes 48. The cleaning agent introduction pipe 44 extends along the inner wall of the cylindrical portion 36, and its opening 44a is connected to the mounting plate 23.
It is provided so as to penetrate through and protrude outward. The cleaning agent distribution pipe 45 is provided between the cleaning agent introduction tube 44 and the cleaning agent distribution hole 46 bored in the partition wall 37, and is integrally attached to both. It opens into a drug reservoir 47. The cleaning agent reservoir 47 is an annular space surrounded by the cutout groove 40 and the mounting edge 38. The nozzle hole 48 is a hole bored in the partition wall 37 from the cleaning agent reservoir 47 toward the surface of the pressure receiving diaphragm 21.

Next, the operation of the pressure detector equipped with the cleaning device according to the invention constructed as described above will be explained.

First, if components during the process adhere to the gap G and form deposits, a high-pressure cleaning agent (water, steam, air, etc.) is introduced into the introduction hole 32 of the cleaning agent introduction spout section 28 . The introduced cleaning agent fills the annular groove 31 and is vigorously jetted out from the jetting portion 35 to clean the gap G. This is because, as described above, the annular groove 31 is filled with high-pressure cleaning agent because the spouting portion 35 is formed narrowly.

Next, if components during the process adhere to the pressure receiving diaphragm or its vicinity, clean the cleaning agent inlet pipe 4.
A high-pressure cleaning agent is supplied to the cleaning agent reservoir 47 through the 4-cleaning agent distribution pipe 45 and the cleaning agent distribution hole 46 . The cleaning agent supplied to the cleaning agent reservoir 47 fills the cleaning agent reservoir 47 with a constant high pressure, and is vigorously jetted out from the nozzle hole 48 and reaches the pressure receiving diaphragm 21.
and its vicinity.

Next, the advantages of the detector equipped with the cleaning device according to the invention, which is constructed and operates as described above, are as follows.

(1) It becomes possible to clean and remove deposits without removing the pressure detector 20 from the side wall 2, and the period for maintenance and inspection of the detector can be extended.

(2) Since the gap G can be constantly cleaned, the pressure detector 20 can be easily attached and detached from the side wall 2 without any deposits sticking to it.

(3) Since components during the process can be prevented from adhering to the pressure receiving diaphragm 21 and its vicinity, the performance of the pressure detector 20 can be maintained for a long period of time.

(4) Precision machining to make the gap G as narrow as possible is not required, so man-hours can be reduced and manufacturing costs can be reduced.

In addition, in the above embodiment, the cleaning agent introduction pipe 44
Although one cleaning agent flow pipe 45 and one cleaning agent distribution hole 46 are provided, two or more may be provided. Moreover, it does not matter how many nozzle parts 48 are provided.

As shown in Fig. 1, conventional pressure detectors have a fitting part in addition to those that fit into a fitting part 3 formed in a cylindrical shape on the side wall 2 of the process. Simply punch the side wall 2 of the process without
There is a pressure sensor (referred to as a flat pressure sensor) that is directly attached to the side wall 2. In such a pressure sensor, the adhesion of components between the side wall and the pressure sensor during the process is so small that it does not become a problem, so it is only necessary to consider cleaning the pressure receiving diaphragm and its vicinity.
Only the pressure-receiving diaphragm cleaning device needs to be provided.

As explained above, the pressure detector equipped with the cleaning device according to the present invention has a cleaning device that cleans between the side wall of the process and the pressure detector, and the pressure receiving diaphragm and its vicinity. Since the structure is provided between the detectors and within the pressure sensor, components during the process can be attached and the deposits can be cleaned and removed before they cause various problems.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional pressure detector, and Figs. 2 to 4 show an embodiment of this invention.
Figure 2 is a sectional view of a pressure detector equipped with a cleaning device according to this invention, Figure 3 A and B are side sectional views and front views of the fitting gap cleaning device, and Figure 4 A and B are mounting edges. FIG. 2 is a rear view and a side sectional view. 2... Side wall, 20... Pressure detector, 21... Pressure receiving diaphragm, 26... Fitting gap cleaning device, 2
7...Pressure diaphragm cleaning device, G...Gap.

Claims (1)

[Scope of utility model registration request] a cylindrical fitting part with one end fixed perpendicular to the side wall of the measuring fluid; a flange formed in the shape of a brim at the other end of the fitting part; a cylindrical part inserted into the fitting part;
a mounting plate that is attached to the cylindrical portion facing the flange and fixed to the flange; a partition that is provided with a concave portion on the side of the cylindrical portion in contact with the measurement fluid; and a partition that is provided to cover the partition. A pressure detector comprising a pressure receiving diaphragm, a capillary reach tube whose one end is connected to a chamber constituted by the pressure receiving diaphragm and the partition wall, and a sealing liquid sealed in the capillary reach tube and the chamber, a gap provided between the fitting part and the cylindrical part; a ring-shaped cleaning agent introduction/spouting part sandwiched between the mounting plate and the flange via a ring-shaped gasket; and the cleaning agent. Fitting gap cleaning comprising: an annular groove provided at the center of the inner circumferential edge of the introduction jetting part and communicating with the gap; and an introduction hole provided in the cleaning agent introduction jetting part in a radial direction so as to communicate the annular groove with the outside. a notch groove provided in an annular shape on the outer periphery of the cylindrical portion on the side of the fluid to be contacted; and an annular mounting edge that covers the notch groove and forms a cleaning reservoir with the notch groove and is screwed to the cylindrical portion; and a cleaning conduit that axially passes through the cylindrical part and has one end communicating with the cleaning reservoir, and a cleaning conduit that is provided in the radial direction of the cylindrical part and has one end communicating with the cleaning reservoir and the other end communicating with the recess. 1. A pressure detector equipped with a cleaning device, characterized in that it is equipped with a pressure receiving diaphragm cleaning device having a nozzle.