JP2002005769A - Differential pressure measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a differential pressure measuring device capable of replacing a seal diaphragm, reducing the maintenance cost, and friendly to the environment. SOLUTION: This differential pressure measuring device in which a main body storing a pressure sensor is kept in contact with a measured fluid via the seal diaphragm is provided with a seal block insertion hole provided on the measured fluid contact face of the main body, a seal block inserted and fitted into the seal block insertion hole, a seal body provided on the connection face of the seal block and the seal block insertion hole to seal the seal block and the seal block insertion hole, a guide hole provided on the seal block to guide the measured fluid, and the seal diaphragm provided on the connection face of the seal block and the measured fluid contact face to seal the measured fluid contact face and the guide hole guiding the measured fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a seal diaphragm which can be replaced and maintenance cost is reduced.
The present invention relates to an environmentally friendly differential pressure measuring device.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of the structure of a conventional example generally used in the prior art.
No. 6 discloses this.

In FIG. 3, a main body 1 having a built-in pressure sensor 2 has a structure of sealed liquids 101 and 102, and is in contact with a measurement fluid FL via a seal diaphragm 3. Usually, silicone oil is used and sealed.

The seal diaphragm 3 is joined to the main body 1 by welding or the like. In most cases, the shape of the seal diaphragm 3 is circular from the viewpoint of ease of welding and uniformity of welding distortion. The cover 4 covers the seal diaphragm 3.

In the above configuration, one of the measurement fluids FL
Accordingly, when pressure acts from the high pressure side H, the pressure acting on the seal diaphragm 3 is transmitted to the pressure sensor 2 by the filling liquid 101.

On the other hand, the low pressure side L
When pressure acts from above, the pressure acting on the seal diaphragm 3 is transmitted to the pressure sensor 2 by the filling liquid 102. As a result, according to the pressure difference between the high pressure side and the low pressure side,
The pressure sensor 2 measures the differential pressure.

[0007]

However, in such an apparatus, (1) when the seal diaphragm 3 is welded to the main body 1 in consideration of chucking to a welding machine, it is joined to any part of the main body 1. It is not possible.

(2) In order to join the seal diaphragm 3 to the main body 1 with high accuracy, the large main body 1 must be machined with high accuracy.

(3) Further, by rotating the main body 1
When performing Tig welding, etc., the place where welding is performed must be continuous and face the welding machine.
The main body 1 must be rotated eccentrically from the center of gravity, which makes the design of the jig difficult.

(4) It is impossible to replace the seal diaphragm 3 after the seal diaphragm 3 has been once welded to the main body 1. Therefore, the sealing diaphragm 3
In the event that a problem occurs, the entire body 1 must be discarded, which cannot contribute to environmental problems.

An object of the present invention is to solve the above-mentioned problem, and to provide an environment-friendly differential pressure measuring device which enables replacement of a seal diaphragm, reduces maintenance costs, and is environmentally friendly.

[0012]

In order to achieve the above object, according to the present invention, in the differential pressure measuring device according to the first aspect, the main body having the built-in pressure sensor is measured via a sealing diaphragm. In a differential pressure measuring device that comes into contact with a fluid, a seal block insertion hole provided on a measurement fluid contact surface of the main body, a seal block inserted and attached to the seal block insertion hole, the seal block and the seal block insertion hole A seal body provided on the joint surface of the seal block and sealing the seal block and the seal block insertion hole, an introduction hole provided in the seal block and introducing a measurement fluid, and a measurement fluid contact surface of the seal block. A sealing diaphragm provided on a joint surface for sealing the measurement fluid contact surface and the introduction hole into which the measurement fluid is introduced. Characterized in that it was.

According to a second aspect of the present invention, in the differential pressure measuring device according to the first aspect, the seal block is detachably attached to the seal block insertion hole.

According to a third aspect of the present invention, in the differential pressure measuring device according to the second aspect, the seal block is screwed to the seal block insertion hole.

According to a fourth aspect of the present invention, in the differential pressure measuring device according to any one of the first to third aspects, an O-ring is used as the seal body.

According to a fifth aspect of the present invention, in the differential pressure measuring device according to any one of the first to fourth aspects,
The seal diaphragm is welded to the seal block.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention,
FIG. 2 is a detailed explanatory diagram of a main part of FIG. In the figure, the configuration of the same symbol as FIG. 3 represents the same function. Hereinafter, only differences from FIG. 3 will be described.

In the figure, a seal block insertion hole 11 is shown.
Is provided on the liquid contact surface of the measurement fluid FL of the main body 1. The seal block 12 is provided with the seal block insertion hole 1.
1 and attached.

In this case, the seal block 12 is detachably attached to the seal block insertion hole 11. Specifically, the seal block 12 is screwed 121 into the seal block insertion hole 11.

Specifically, a PT parallel screw is used as the screw. The seal body 13 is a seal block 12
The seal block 12 and the seal block insertion hole 11 are provided on the joint surface between the seal block 12 and the seal block insertion hole 11.

In this case, an O-ring is used as the seal 13. The introduction hole 14 is provided in the seal block 1
2 and the measurement fluid FL is introduced. The seal diaphragm 15 is provided on the joint surface of the seal block 12 with the liquid contact surface of the measurement fluid FL.
4 is sealed.

In this case, the seal diaphragm 15 is
The periphery is welded to the seal block 12.

In the above configuration, one of the measurement fluids FL
Accordingly, when pressure acts from the high pressure side H, the pressure acting on the seal diaphragm 15 is transmitted to the pressure sensor 2 by the filling liquid 101. On the other hand, the other measurement fluid FL
Accordingly, when a pressure acts from the low pressure side L, the pressure acting on the seal diaphragm 15 is transmitted to the pressure sensor 2 by the filling liquid 102.

To replace the seal diaphragm 15, the seal block 12 to which the seal diaphragm 15 is fixed by welding is removed from the main body 1. Filled liquid 10
Inject 1,102.

The seal block 12 to which the new seal diaphragm 15 is fixed by welding is newly attached to the main body 1. In this way, it is possible to replace the sealing diaphragm, which was not possible before.

As a result, (1) Since the seal diaphragm 15 which is likely to cause a failure or a defect is formed as a separate part from the main body 1, the defect of the seal diaphragm 15 can be handled separately from the defect of the main body 1. .

The cause of the failure is the seal diaphragm 1
5, the main body 1 is not discarded, and the seal block 12 provided with the seal diaphragm 15 is not discarded.
Since only the replacement is required, the product life can be prolonged, and a differential pressure measuring device that can contribute to environmental issues such as reduction of industrial waste can be obtained.

(2) Since the seal block 12 is removably attached to the seal block insertion hole 11, the replacement of the seal diaphragm 15 is facilitated, and a differential pressure measuring device with improved maintainability is obtained.

(3) Since the seal block 12 is screwed into the seal block insertion hole 11, the attachment / detachment of the seal block by the screw is reliable, and a differential pressure measuring device with improved reliability can be obtained.

(4) Since the seal block 12 is screwed into the seal block insertion hole 11, the seal block 12 can be easily attached / detached without replacing the seal block 12 with a special tool, thereby improving maintainability. The obtained differential pressure measuring device is obtained.

(5) Since an O-ring is used as the seal body 13, the O-ring has marketability and an inexpensive differential pressure measuring device can be obtained.

(6) Since an O-ring is used as the seal body 13, it is possible to use a special machine such as a welding machine without using a special machine.
The sealing performance between the main body 1 and the seal block 12 can be easily obtained, and a differential pressure measuring device with improved productivity can be obtained.

(7) Since the seal block 12 is inserted and attached to the seal block insertion hole 11, the O-ring 1
3 can be easily replaced, and a differential pressure measuring device with improved maintainability can be obtained.

(8) Since the seal diaphragm 15 is welded to the seal block 12, the seal between the measurement fluid FL and the sealed liquids 101 and 102 can be reliably obtained, and a differential pressure measuring device with improved reliability can be obtained. Can be

The foregoing description has been directed to specific preferred embodiments for the purpose of describing and illustrating the invention. Therefore, the present invention is not limited to the above-described embodiments, and includes many more modifications without departing from the spirit thereof.
This includes deformation.

[0036]

As described above, according to the first aspect of the present invention,
According to the above, the following effects are obtained. Since the seal diaphragm, which is likely to cause a failure or a defect, is formed as a separate part from the main body, the defect of the seal diaphragm can be handled separately from the defect of the main body.

Further, when the failure is caused by the seal diaphragm, only the seal block provided with the seal diaphragm need be replaced without discarding the main body, thereby extending the product life and reducing industrial waste. Thus, a differential pressure measuring device that can contribute to environmental problems such as the above can be obtained.

According to the second aspect of the present invention, the following effects can be obtained. Since the seal block is detachably attached to the seal block insertion hole, replacement of the seal diaphragm is facilitated, and a differential pressure measuring device with improved maintainability is obtained.

According to the third aspect of the present invention, the following effects can be obtained. (1) Since the seal block is screwed into the seal block insertion hole, the attachment and detachment of the seal block by the screw are reliable, and a differential pressure measuring device with improved reliability can be obtained.

(2) Since the seal block is screwed into the seal block insertion hole, the seal block can be easily attached and detached without the need for a special tool at the time of replacement of the seal block, thereby improving the maintainability. A pressure measuring device is obtained.

According to the fourth aspect of the present invention, the following effects can be obtained. (1) Since an O-ring is used as the seal, the O-ring has marketability and an inexpensive differential pressure measuring device can be obtained.

(2) Since an O-ring is used as the seal body, the sealing performance between the main body and the seal block can be easily obtained without using a special machine such as a welding machine, and the productivity is improved. A differential pressure measuring device is obtained.

(3) Since the seal block is inserted into the seal block insertion hole, the O-ring can be easily replaced, and a differential pressure measuring device with improved maintainability can be obtained.

According to the fifth aspect of the present invention, the following effects can be obtained. Since the seal diaphragm is welded to the seal block, a seal between the measurement fluid and the sealed liquid can be reliably obtained, and a differential pressure measuring device with improved reliability can be obtained.

Therefore, according to the present invention, the seal diaphragm can be replaced, the maintenance cost is reduced, and an environmentally friendly differential pressure measuring device can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is a detailed explanatory view of a main part of FIG. 1;

FIG. 3 is an explanatory diagram of a configuration of a main part of a conventional example generally used in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Pressure sensor 11 Seal block insertion hole 12 Seal block 121 Screw 13 Seal body 14 Inlet hole 15 Seal diaphragm 101 Filled liquid 102 Filled liquid FL Measurement fluid

Claims (5)

[Claims] 1. A differential pressure measuring device in which a main body having a built-in pressure sensor contacts a measurement fluid via a seal diaphragm, wherein a seal block insertion hole provided on a measurement fluid contact surface of the main body is provided. A seal block inserted into and attached to the block insertion hole; a seal body provided on a joint surface between the seal block and the seal block insertion hole to seal the seal block and the seal block insertion hole; and a measurement fluid provided on the seal block. And a seal diaphragm provided on a joint surface of the seal block with the measurement fluid contact surface to seal the measurement fluid contact surface and the introduction hole into which the measurement fluid is introduced. A differential pressure measuring device, characterized in that: 2. The differential pressure measuring device according to claim 1, wherein said seal block is detachably attached to said seal block insertion hole. 3. The seal block according to claim 2, wherein said seal block is screwed into said seal block insertion hole.
The described differential pressure measuring device. 4. The differential pressure measuring device according to claim 1, wherein an O-ring is used as the seal body. 5. The differential pressure measuring device according to claim 1, wherein said seal diaphragm is welded to said seal block.