KR20240028864A - Differential pressure flow meter with improved connection reliability - Google Patents

Abstract

The present invention relates to a differential pressure flow meter, which includes a support pipe connecting a pipe and a flow rate change structure in a double pipe structure, a damage detection wire hanger provided inside the double pipe, and a damage detection wire hanger connecting the damage detection wire hanger and an external terminal block. Equipped with a detection line, it is possible to easily recognize from the outside whether the differential pressure flow meter is damaged by whether the damage detection line is disconnected. In addition, the support pipe of the double pipe structure is double coupled with the pipe, thereby improving the support force. Do it as

Description

Differential pressure flow meter with improved connection reliability {DIFFERENTIAL PRESSURE FLOW METER WITH IMPROVED CONNECTION RELIABILITY}

The present invention relates to a differential pressure flow meter, and in particular to a differential pressure flow meter with an improved structure so that an immediate response can be taken by detecting when the flow change structure that changes the flow rate is separated or damaged inside the pipe.

A differential pressure flow meter changes the flow of the fluid (e.g., speed and pressure) by modifying the shape of the pipe through which the fluid flows or providing a structure inside the pipe, and calculates the flow rate of the fluid flowing inside the pipe based on this. It is a type of flow meter.

The V-Cone type flow meter shown in Figure 1, which is a type of differential pressure flow meter, changes the flow of fluid by providing a cone-shaped flow rate change structure 20 inside the pipe 10 through which fluid flows.

The fluid flowing inside the pipe 10 passes through the flow rate change structure 20 and the flow rate is reconfigured, based on the area where the outer peripheral surface of the flow rate change structure 20 has the maximum diameter, at the rear end (or On the downstream side (area B in Figure 1), low hydraulic pressure is formed.

The difference in hydraulic pressure formed at the front end (or upstream side) (area A in Figure 1) and the rear end (or downstream side) (area B in Figure 1) centered on the flow rate change structure 20 is the pressure provided in the pipe 10. It is measured through a pressure sensor (not shown) combined with the measurement taps 40 and 50.

The pressure difference (△P=P1-P2) formed by the flow rate change structure 20 increases or decreases depending on the flow rate. Therefore, the flow rate can be calculated by substituting the measured differential pressure (△P) into Bernoulli's equation.

In this way, the V-Cone type differential pressure flow meter has a simple structure, has no moving or moving parts during installation, so it is easy to install, has low wear, and has the advantage of excellent measurement reliability.

However, in the V-Cone type differential pressure flow meter, as shown in Figure 2, the relatively large flow rate change structure 20 is supported by one support pipe 30, so that it is structurally difficult to install in the piping system where the flow meter is installed. It has a structural disadvantage in that the support pipe 30 can be easily broken due to possible vibration or sudden increase or decrease in flow rate.

In fact, it has been reported that during the operation of a power plant, the V-Cone type flow meter installed at the inlet of the feed water pump broke and flowed into the feed pump, causing major damage to the feed water pump.

Therefore, in the V-Cone type differential pressure flow meter, there is an urgent need to develop technology to prevent the support pipe from breaking, damage, or separation. In particular, even if it is damaged, the development of technology to immediately recognize it and take follow-up measures is necessary. The situation is urgent.

Republic of Korea Patent Publication No. 10-2015-0115471

The present invention is intended to solve the above-mentioned problems. By providing a damage monitoring line, the separation or damage of the flow rate change structure can be determined by whether the damage monitoring line is disconnected. This improves connection reliability to enable immediate initial action. The purpose is to provide a differential pressure flow meter.

In addition, another embodiment of the present invention to solve the above-described problem is to provide a differential pressure flow meter with improved connection reliability and improved support by modifying the support pipe supporting the flow rate change structure to be double coupled with the pipe. will be.

In order to solve the above-described problems, in an embodiment of the present invention, a differential pressure flow meter with improved connection reliability consists of piping; a flow rate change structure provided inside the pipe and spaced apart from the inner peripheral surface of the pipe, and changing the flow rate and hydraulic pressure of the fluid flowing inside the pipe; A support pipe that connects the flow rate change structure and the pipe to support the flow rate change structure to be fixed at a predetermined position inside the pipe, and is provided as a double pipe structure in which the inner pipe and the outer pipe are spaced apart from each other. a detection unit that measures a change in hydraulic pressure of the fluid due to the flow rate change structure and calculates a flow rate of the fluid flowing inside the pipe from the measured value; A damage monitoring line hanger provided at a predetermined position between the inner tube and the outer tube; And a damage monitoring line connecting the damage monitoring line hanger and a terminal block outside the pipe; including, characterized in that whether the flow rate change structure is separated or damaged can be determined by whether the damage monitoring line is disconnected.

In addition, the flow rate change structure includes a front end portion provided in a cone shape with an outer surface forming a first inclination angle (θ ₁ ) with the central axis along the direction of flow of the fluid flowing inside the pipe; And a rear end connected to the front end and having an outer surface forming a second inclination angle (θ ₂ ) with the central axis and having a conical shape, wherein the second inclination angle (θ ₂ ) is the first inclination angle (θ ₁ ) may be larger than that.

In addition, the flow rate change structure may further include an auxiliary support that connects the outer peripheral surface of the flow rate change structure and the inner peripheral surface of the pipe to support the flow rate change structure so that it does not escape from the inside of the pipe.

In addition, the damage monitoring line may form an electrical circuit with the terminal block and a control unit connected to the terminal block so that whether the damage monitoring line is disconnected can be recognized through the control unit.

Another embodiment of the differential pressure flow meter with improved connection reliability according to the present invention to solve the above-mentioned problems consists of piping; a flow rate change structure provided inside the pipe and spaced apart from the inner peripheral surface of the pipe, and changing the flow rate and hydraulic pressure of the fluid flowing inside the pipe; a support pipe connecting the flow rate change structure and the pipe to support the flow rate change structure so that it is fixed at a predetermined position inside the pipe; And a detection unit that measures the change in hydraulic pressure of the fluid due to the flow rate change structure and calculates the flow rate of the fluid flowing inside the pipe from the measured value, wherein the support pipe is a double pipe whose inner pipe and outer pipe are arranged to be spaced apart. It is provided in a structure where the exterior forms a primary connection with the pipe, and the inner pipe protrudes outside the pipe more than the exterior to form a secondary connection with the pipe, thereby strengthening the bearing force.

In addition, the support pipe includes a damage monitoring line hanger provided at a predetermined position between the inner tube and the exterior so that the separation or damage of the flow rate change structure can be determined by whether the damage monitoring line is disconnected. and a damage monitoring line connecting the damage monitoring line hanger and a terminal block outside the pipe.

In addition, the damage monitoring line may form an electrical circuit with the terminal block and a control unit connected to the terminal block so that whether the damage monitoring line is disconnected can be recognized through the control unit.

In addition, the flow rate change structure includes a front end portion provided in a cone shape with an outer surface forming a first inclination angle (θ ₁ ) with the central axis along the direction of flow of the fluid flowing inside the pipe; And a rear end connected to the front end and having an outer surface forming a second inclination angle (θ ₂ ) with the central axis and having a conical shape, wherein the second inclination angle (θ ₂ ) is the first inclination angle (θ ₁ ) may be larger than that.

In addition, the flow rate change structure may further include an auxiliary support that connects the outer peripheral surface of the flow rate change structure and the inner peripheral surface of the pipe to support the flow rate change structure so that it does not escape from the inside of the pipe.

The present invention has the advantage of being able to prevent and minimize additional damage by enabling immediate initial action because the separation or damage of the flow rate change structure can be determined by disconnection of the damage monitoring line according to the above-described configuration and coupling relationship.

In addition, the bearing capacity of the support pipe connecting the pipe and the flow rate change structure is improved, which has the advantage of preventing the flow rate change structure from being separated or damaged.

Figure 1 is a diagram showing the structure of a V-cone flow meter belonging to a differential pressure flow meter.
Figure 2 is a front cross-sectional view showing problems occurring in conventional differential pressure flow meters and V-cone flow meters.
Figure 3 is a cross-sectional view showing the structure of the first embodiment, which is an example of the differential pressure flow meter with improved connection reliability according to the present invention.
Figure 4 shows a modified example of the first embodiment. Figure 4(a) is a front cross-sectional view, and Figure 4(b) is a cross-sectional view viewed from one side of the AA plane of Figure 3.
Figure 5 is a front cross-sectional view showing the structure of the second embodiment, which is an example of the differential pressure flow meter with improved connection reliability according to the present invention.
Figure 6 is a front cross-sectional view showing a modified example of the second embodiment.

This specification clarifies the scope of rights of the present invention, explains the principles of the present invention, and discloses embodiments so that those skilled in the art can practice the present invention. The disclosed embodiments may be implemented in various forms.

Expressions such as “include” or “may include” that may be used in various embodiments of the present invention refer to the existence of the corresponding function, operation, or component that has been disclosed, and one or more additional functions, operations, or components. There are no restrictions on components, etc.

In addition, in various embodiments of the present invention, terms such as “comprise” or “have” are intended to refer to the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but It should be understood that it does not exclude in advance the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

When a component is referred to as being “connected or coupled” to another component, the component may be directly connected or coupled to the other component, but there is no connection between the component and the other component. It should be understood that other new components may exist.

On the other hand, when a component is said to be “directly connected” or “directly coupled” to another component, it will be understood that no new components exist between said component and said other component. You should be able to.

Terms such as first, second, etc. used in this specification may be used to describe various components, but the components should not be limited by the terms. Terms are used only to distinguish one component from another.

Hereinafter, the first embodiment will be described in detail as a preferred embodiment of the present invention with reference to FIGS. 2 to 4.

First of all, the present invention relates to a differential pressure flow meter. The differential pressure flow meter is equipped with a flow rate change structure 200 to change the flow rate of the fluid flowing inside the pipe 100. The flow rate change structure 200 is continuously exposed to hydraulic pressure, so there is a high possibility of damage.

If the flow rate change structure 200 is damaged or separated within the piping 100 system, major damage or failure may occur not only in the flow meter but also in the piping 100 system itself, so the flow rate change structure 200 is damaged or separated. It is very important to prevent further damage.

Accordingly, the present invention is provided with a damage monitoring line 340, and enables the repair of the damaged flow rate change structure 200 by determining whether the flow rate change structure 200 is separated or damaged depending on whether the damage monitoring line 340 is disconnected. and management, as well as preventing additional damage that may occur in the piping 100 system itself.

To this end, referring to Figure 3, the first embodiment, which is a preferred embodiment of the plug-in flow meter with improved connection reliability according to the present invention, consists of a pipe 100, a flow rate change structure 200, a support pipe 300, and a detection unit. (not shown), may include a damage monitoring line hanger 330, and a damage monitoring line 340.

Looking at each configuration in detail below, the pipe 100 refers to a typical pipe 100 in which a fluid flows and a flow rate measurement of the fluid is required.

For example, it may be the pipe 100 used in a water supply system provided for water supply at a power plant, or it may be the pipe 100 used in a system that supplies gas such as gas.

The flow rate change structure 200 changes the flow rate and hydraulic pressure of the fluid flowing inside the pipe 100, and may be provided inside the pipe 100 to be spaced apart from the inner peripheral surface of the pipe 100.

In addition, the flow rate change structure 200 has an outer surface forming a first inclination angle (θ ₁ ) with the center along the direction of flow of the fluid flowing inside the pipe 100, and is connected to a front end portion provided in a cone shape and a front end portion. The outer surface forms a second inclination angle (θ ₂ ) with the central axis and includes a rear end provided in a cone shape, and the second inclination angle (θ ₂ ) may be larger than the first inclination angle (θ ₁ ).

For example, in a V-cone type plug-in flow meter, the flow rate change structure 200 is a cone-shaped flow rate change structure 200 piped by a support pipe 300, as shown in Figure 3. It is indirectly connected to and supported by (100), and the inner peripheral surface of the pipe 100 and the outer peripheral surface of the flow rate change structure 200 are spaced apart from each other.

In addition, referring to Figure 3, the cone-shaped flow rate change structure 200 has a cone shape with its outer surface forming a first inclination angle (θ ₁ ) with the center along the direction of flow of the fluid flowing inside the pipe 100. It is connected to the front end provided with a front end and the outer surface forms a second inclination angle (θ ₂ ) with the central axis and includes a rear end provided in a cone shape, and the second inclination angle (θ ₂ ) is the first inclination angle (θ ₁ ) is provided larger than that, so that the fluid flowing inside the inner tube 310 is compressed as it passes the front end of the flow rate change structure 200, so that the flow speed increases, and when it reaches the rear end, the pressure decreases.

As shown in FIG. 3, the support pipe 300 connects the flow rate change structure 200 and the pipe 100 to support the flow rate change structure 200 so that it is fixed at a predetermined position inside the pipe 100. It plays a role and may be provided as a double pipe structure in which the inner pipe 310 and the outer pipe 320 are spaced apart.

The support pipe 300 is provided with a double pipe structure forming a hollow between the inner pipe 310 and the outer pipe 320, and a damage monitoring line hanger 330 and a damage monitoring line ( 340) can be provided.

The damage monitoring line hanger 330 ensures that the damage monitoring line 340 is fixed at a predetermined position between the inner pipe 310 and the outer pipe 320, thereby preventing damage or separation of the flow rate change structure 200 or the support pipe ( It serves to ensure that the damage monitoring line 340 can be disconnected in response to damage or separation of the 300).

As shown in Figure 2, considering that the location where damage frequently occurs is the connection area between the support pipe 300 and the pipe 100, the damage monitoring line hanger 330 corresponds to the inside of the pipe 100 and at the same time It may be provided at a predetermined location between the inner tube 310 and the outer tube 320.

Preferably, it is preferably provided close to the flow rate change structure 200 so that all damage and separation that occurs between the connection portion of the pipe 100 and the support pipe 300 and the flow rate change structure 200 can be detected. .

As shown in Figure 4 (a), the damage monitoring wire hanger 330 may be provided in plural numbers along the support pipe 300 between the inner pipe 310 and the outer pipe 320. In this case, the breakage monitoring line 340 that is disconnected varies depending on the damaged or separated part of the support pipe 300, and this has the advantage of being able to precisely recognize the damaged or separated location.

The damage monitoring line hanger 330 is for fixing the damage monitoring line 340, and its shape is a bar or pillar connecting the inner tube 310 and the outer tube 320 as shown in Figure 3. It can be provided with .

However, it is not limited to this, and the damage monitoring line 340 may be fixed, such as a hook-shaped or ring-shaped hanging means provided on one side of the inner tube 310 or the outer tube 320, and the flow rate change structure ( Any structure that allows the damage monitoring line 340 to be disconnected along with damage or separation of the support pipe 200) or the support pipe 300 should be construed as included in the present invention.

The damage monitoring line 340 connects the damage monitoring line hanger 330 and the terminal block 350 provided outside the pipe 100, and the flow rate change structure 200 is separated or damaged or the support pipe 300 is separated. It serves to enable the outside of the pipe 100 to recognize a problem situation inside the pipe 100 due to disconnection along with damage.

The damage monitoring line 340 is provided as a conducting wire, and can form an electrical circuit with the terminal block 350 provided outside the pipe 100 and the control unit 360 connected to the terminal block 350, thereby Whether the damage monitoring line 340 is disconnected can be recognized and monitored through the control unit 360.

Specifically, since one side of the damage monitoring line 340 is fixed to the damage monitoring line hanger 330 and the other side is fixed to the terminal block 350, it is resistant to damage or separation of the flow rate change structure 200 or the support pipe 300. As a result, the damage monitoring line hanger 330 pulls the damage monitoring line 340, and a disconnection may occur between the terminal block 350 and the damage monitoring line 340. As a result, the damage monitoring line 340 and the terminal block 350 may be disconnected. And the electrical circuit formed between the control unit 360 is also disconnected, so the control unit 360 can quickly recognize whether the flow rate change structure 200 or the support pipe 300 is damaged or separated.

Alternatively, the connection between the terminal block 350 and the damage monitoring line 340 can be firmly formed. In this case, the damage or separation of the flow rate change structure 200 or the support pipe 300 and the damage monitoring line hanger 330 can be formed. A disconnection may occur in the electrical circuit by cutting the fixed damage monitoring line 340, and the control unit 360 can quickly recognize this.

As shown in FIG. 3, the damage monitoring line 340 may be provided in two layers so as to be symmetrical on both sides with respect to a line passing through the center of the support pipe 300, but is not limited thereto, and is not limited to this, as shown in FIG. 4 (b). ), it can be provided in various ways between the inner pipe 310 and the outer pipe 320 and in various directions of the support pipe 300.

In this case, if damage occurs only on one side of the support pipe 300 or the flow rate change structure 200, there is an advantage in that the damaged side can be precisely recognized.

The terminal block 350 secures and tightens the damage monitoring line 340, one side of which is fixed to the damage monitoring line hanger 330, from the other side, and electrically connects the damage monitoring line 340 and the external control unit 360. perform its role.

The terminal block 350 may be provided on the outer peripheral surface of the pipe 100, and in some cases, may be provided spaced apart from the pipe 100.

As an additional configuration, the first embodiment according to the present invention connects the outer peripheral surface of the flow rate change structure 200 and the inner peripheral surface of the pipe 100 to support the flow rate change structure 200 from being separated from the inside of the pipe 100. An auxiliary support 210 may be further included.

The auxiliary support 210 may be provided in plural, and its shape can effectively support the flow rate change structure 200 in the direction opposite to the flow direction without changing the flow rate flowing inside the pipe 100. It may have a rod shape, but is not limited thereto.

In addition, based on the above structure, it may include a detection unit that measures the change in hydraulic pressure of the fluid caused by the flow rate change structure 200 and calculates the flow rate of the fluid flowing inside the pipe 100 from the measured value.

Referring to FIG. 3, the detection unit has a first pressure sensor coupled to a first pressure measurement tab 400 provided on one side of the pipe 100 in communication with the pipe 100, and the first pressure sensor is connected to the pipe 100. The pressure at the front of the flow rate change structure 200 is measured based on the direction of flow of the fluid flowing inside.

In addition, the second pressure sensor may be coupled to the inner pipe 310 protruding to the outside of the pipe 100, and the fluid flowing in along the inner pipe 310 that penetrates the center of the flow rate change structure 200 and communicates with the through hole provided. Measure the pressure at the rear end of the flow rate change structure 200.

However, it is not limited to this, and the second pressure sensor is a second pressure measurement tab (not shown) separately provided on one side of the outer circumference of the pipe 100 to correspond to the rear end of the flow rate change structure 200, separately from the inner pipe 310. It can be combined with, and in addition, it can be provided in various ways adopted to provide a detection part in a differential pressure flow meter.

Next, the second embodiment, which is another preferred embodiment of the present invention, will be described in detail with reference to FIGS. 4 and 5.

In the description, the same or corresponding components as the first embodiment should be interpreted as having the same structure, function, and effect, and duplicate descriptions will be omitted or briefly explained.

The second embodiment, like the first embodiment, relates to a differential pressure flow meter, and suppresses or reduces the possibility of damage to the flow rate change structure 200, which is highly likely to be damaged due to continuous exposure to the hydraulic pressure of the fluid flowing inside the pipe 100. This is to prevent additional damage to the piping 100 system caused by damage or separation of the flow rate change structure 200 within the piping 100 system.

Accordingly, the present invention provides the support pipe 300 with a double pipe structure in which the inner pipe 310 and the outer pipe 320 are arranged to be spaced apart, and the outer pipe 320 forms a first coupling 325 with the pipe 100. , the inner pipe 310 protrudes out of the pipe 100 more than the exterior 320 to form a secondary coupling 315 with the pipe 100, thereby increasing the supporting force of the support pipe 300 with respect to the pipe 100. It is characterized by improvements.

To this end, referring to Figure 5, the second embodiment, which is a preferred embodiment of the differential pressure flow meter with improved connection reliability according to the present invention, consists of a pipe 100, a flow rate change structure 200, a support pipe 300, and a detection device. It includes a portion (not shown), and the support pipe 300 is a double pipe structure in which the inner pipe 310 and the outer pipe 320 are spaced apart, and the inner pipe 310 protrudes out of the pipe 100 more than the outer pipe 320. It can be.

Looking at each configuration in detail below, the piping 100, the flow rate change structure 200, and the detection unit are the same as the first embodiment described above, so they should be interpreted as having the same structure, function, and effect, and duplicate descriptions are provided. I will omit it and focus on the differences.

As shown in Figure 5, the support pipe 300 connects the flow rate change structure 200 and the pipe 100 to support the flow rate change structure 200 so that it is fixed at a predetermined position inside the pipe 100. It functions as a double pipe structure in which the inner pipe 310 and the outer pipe 320 are spaced apart.

One end of the exterior 320 forms a first coupling 325 with the pipe 100. The exterior 320 may protrude a predetermined length outside the pipe 100 to form a first coupling 325 with the outer peripheral surface of the pipe 100.

The first coupling 325 can be performed using various methods adopted for coupling between pipes 100 in the technical field to which the present invention belongs, including welding.

As shown in FIG. 6, the exterior 320 may be provided to extend inwardly continuously to the pipe 100 in some cases. In this case, the first coupling 325 is connected to the exterior 320 to strengthen the bearing capacity. It may be formed between the inner peripheral surface of the pipe 100 and the pipe 100.

The first coupling 325 is performed in consideration of ease of process, and the outer peripheral surface of the exterior 320 and the pipe 100 and the exterior 320 and the pipe are connected to each other to strengthen the coupling force between the pipe 100 and the support pipe 300. Of course, the first bond (325) can be formed on all inner peripheral surfaces of (100).

The inner pipe 310 may protrude outside the pipe 100 beyond the exterior 320 to form a secondary coupling 315 with the pipe 100. Like the first coupling 325 method, the secondary coupling 315 method can be performed using various methods adopted for coupling between pipes 100 in the technical field to which the present invention belongs, including welding.

The outer pipe 320 and the inner pipe 310 each form a double bond with the pipe 100, making it more robust and balanced compared to the existing bond between the support pipe 300 and the pipe 100. It can be easily expected that a positive bond can be formed, and as a result, the possibility of damage to the support pipe 300 and the flow rate change structure 200 is significantly reduced.

As shown in FIG. 5, the support pipe 300 is provided with a double pipe structure in which the inner pipe 310 and the outer pipe 320 are spaced apart, so it is damaged at a predetermined location between the inner pipe 310 and the outer pipe 320. A monitoring line hanger 330 may be provided, and a damage monitoring line 340 connecting the damage monitoring line hanger 330 and the terminal block 350 outside the pipe 100 may be provided.

Accordingly, in the second embodiment according to the present invention, whether the flow rate change structure 200 is separated or damaged can be determined by whether the damage monitoring line 340 is disconnected, and at the same time, the exterior 320 and the piping ( 100) Since the inner tube 310 protruding to the outside forms the first coupling 325 and the second coupling 315, the risk of damage or separation of the support tube 300 and the flow rate change structure 200 is significantly reduced. Even if it is damaged or separated, it can be immediately recognized, so it can be easily expected that the connection reliability will be significantly improved compared to the existing differential pressure flow meter.

The structure, function, and effect of the damage monitoring line hanger 330 and the damage monitoring line 340 and various examples of modifications shown in Figure 4 are the same as the above-described first embodiment and should be interpreted in the same way, and duplicate descriptions are omitted. I decided to do it.

Likewise, the damage monitoring line 340 is provided as a conducting wire, so that it can form an electrical circuit with the terminal block 350 provided outside the pipe 100 and the control unit 360 connected to the terminal block 350. Accordingly, whether the damage monitoring line 340 is disconnected can be recognized and monitored through the control unit 360.

Likewise, the second embodiment according to the present invention is an auxiliary support that connects the outer peripheral surface of the flow rate change structure 200 and the inner peripheral surface of the pipe 100 to prevent the flow rate change structure 200 from being separated from the inside of the pipe 100. It may further include 210, and the structure, function, effect, and modification example of the auxiliary support 210 are the same as those of the first embodiment described above and should be interpreted in the same way, and redundant description will be omitted.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not intended to be limiting.

For example, the present invention has been described with reference to an embodiment shown in the drawings, but this is merely illustrative and those skilled in the art will understand that various modifications and variations of the embodiment are possible therefrom. will be.

Therefore, the true scope of technical protection of the present invention is indicated by the technical spirit of the claims described later, and all changes or modified forms derived from the scope and scope of the claims and their equivalent concepts are included in the scope of the present invention. It should be interpreted as

10: Piping
20: Flow rate change structure
30: support pipe
40: first pressure measurement tab
50: Second pressure measurement tab
100: Piping
200: Flow rate change structure
210: Auxiliary support
300: support pipe
310: inner tube
315: secondary bond
320: Appearance
325: 1st bond
330: Damage monitoring line hanger
340: Damage monitoring line
350: terminal block
360: Control unit
400: First pressure measurement tab

Claims (9)

pipe;
a flow rate change structure provided inside the pipe and spaced apart from the inner peripheral surface of the pipe, and changing the flow rate and hydraulic pressure of the fluid flowing inside the pipe;
A support pipe that connects the flow rate change structure and the pipe to support the flow rate change structure to be fixed at a predetermined position inside the pipe, and is provided as a double pipe structure in which the inner pipe and the outer pipe are spaced apart from each other.
a detection unit that measures a change in hydraulic pressure of the fluid due to the flow rate change structure and calculates a flow rate of the fluid flowing inside the pipe from the measured value;
A damage monitoring line hanger provided at a predetermined position between the inner tube and the outer tube; and
Including a damage monitoring line connecting the damage monitoring line hanger and a terminal block outside the pipe, the connection reliability is characterized in that whether the flow rate change structure is separated or damaged can be determined by whether the damage monitoring line is disconnected. Improved differential pressure flow meter. According to paragraph 1,
The flow rate change structure includes a front end portion provided in a cone shape with an outer surface forming a first inclination angle (θ ₁ ) with the central axis along the direction of flow of the fluid flowing inside the pipe; and
A rear end connected to the front end and having an outer surface forming a second inclination angle (θ ₂ ) with the central axis and having a conical shape,
A differential pressure flow meter with improved connection reliability, characterized in that the second inclination angle (θ ₂ ) is larger than the first inclination angle (θ ₁ ). According to paragraph 1,
The flow rate change structure further includes an auxiliary support that connects the outer peripheral surface of the flow rate change structure and the inner peripheral surface of the pipe to prevent the flow rate change structure from being separated from the inside of the pipe. Expression flow meter. According to paragraph 1,
The damage monitoring line forms an electrical circuit with the terminal block and a control unit connected to the terminal block, and is characterized in that whether the damage monitoring line is disconnected can be recognized through the control unit. A differential pressure flow meter with improved connection reliability. pipe;
a flow rate change structure provided inside the pipe and spaced apart from the inner peripheral surface of the pipe, and changing the flow rate and hydraulic pressure of the fluid flowing inside the pipe;
a support pipe connecting the flow rate change structure and the pipe to support the flow rate change structure so that it is fixed at a predetermined position inside the pipe; and
It includes a detection unit that measures the change in hydraulic pressure of the fluid due to the flow rate change structure and calculates the flow rate of the fluid flowing inside the pipe from the measured value,
The support pipe has a double pipe structure in which the inner pipe and the outer pipe are spaced apart,
The exterior forms a primary bond with the pipe,
A differential pressure flow meter with improved connection reliability, characterized in that the inner pipe protrudes outside the pipe more than the exterior to form a secondary coupling with the pipe, thereby strengthening the supporting force. According to clause 5,
The support tube includes a damage monitoring line hanger provided at a predetermined position between the inner tube and the outer tube; and
Including a damage monitoring line connecting the damage monitoring line hanger and a terminal block outside the pipe, the connection reliability is characterized in that whether the flow rate change structure is separated or damaged can be determined by whether the damage monitoring line is disconnected. Improved plug-in flow meter. According to clause 6,
The damage monitoring line forms an electrical circuit with the terminal block and a control unit connected to the terminal block, and is characterized in that whether the damage monitoring line is disconnected can be recognized through the control unit. A differential pressure flow meter with improved connection reliability. According to clause 5,
The flow rate change structure includes a front end portion provided in a cone shape with an outer surface forming a first inclination angle (θ ₁ ) with the central axis along the direction of flow of the fluid flowing inside the pipe; and
A rear end connected to the front end and having an outer surface forming a second inclination angle (θ ₂ ) with the central axis and having a conical shape,
A differential pressure flow meter with improved connection reliability, characterized in that the second inclination angle (θ ₂ ) is larger than the first inclination angle (θ ₁ ). According to clause 5,
The flow rate change structure further includes an auxiliary support that connects the outer peripheral surface of the flow rate change structure and the inner peripheral surface of the pipe to prevent the flow rate change structure from being separated from the inside of the pipe. Expression flow meter.

Images