JP2002213669A - Pipe joint with special passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint for joining a pipe and a pipe with a special passage, which is formed as either a sensor entry or a fluid inlet at a prescribed position at the joint. SOLUTION: The pipe joint for joining a first pipe and a second pipe, forming a flow passage comprises a first connection pipe for connecting the first pipe, a second connection pipe for connecting the second pipe, and a box for joining the first connection pipe and the second connection pipe. At least one of the outer wall faces of the box is formed as a flat face, the diameter of the flow passage in the box is formed larger than the diameter of the flow passage in the first connection pipe and the second connection pipe, and the special passage is formed as the sensor entry on the flat face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting pipes to each other, and has a dedicated passage for forming either a sensor insertion port or a fluid inlet at a predetermined position of the connection. For pipe fittings.

[0002]

2. Description of the Related Art Generally, a flow passage for passing a fluid is formed by a pipe. When a relatively high temperature fluid is passed, the pipe is made of iron, aluminum, stainless steel, or the like. When a relatively low temperature fluid is passed, a resin made of resin such as vinyl chloride is used.

When it is desired to secure the distance of the flow path to some extent longer, a plurality of pipes are connected by using a pipe joint, whereby a long flow path that cannot be secured by a single pipe is used. The distance is secured.
In addition to the requirement to ensure a longer flow path distance as described above, there is also a demand to be able to form the flow path by bending it at an appropriate angle. In the case of such a request, a desired curved flow path has been secured by changing the mounting angle of the pipe to the pipe joint.

By the way, in order to manage the change in the fluid passing through the pipe, it is necessary to detect and check basic data such as the temperature and pressure of the fluid in the flow path. A sensor to detect pressure, etc.
Must be mounted anywhere in the flow path. A socket or the like may be attached to the dedicated passage for mounting the sensor for convenience of mounting.

In some cases, another fluid is newly mixed with the fluid in the flow channel. In this case, a dedicated fluid injection passage for injecting another fluid to be mixed is provided. It had to be formed somewhere on the road. Of course, a socket or the like may also be attached to the dedicated passage for fluid injection for convenience of attachment.

[0006] Furthermore, the high temperature fluid in the flow path has the highest center temperature, and the temperature tends to be deprived by the pipe from the center to the outside, so that the temperature decreases. Also, the temperature distribution in the pipe is stable near the center, but unstable near the outside.

[0007]

Since the above-mentioned pipe is constituted by a peripheral wall having a circular cross section,
If a dedicated passage for mounting a sensor or injecting fluid is formed on the peripheral wall of the pipe, the temperature distribution near the outer surface is unstable in the flow path with a circular cross section. There was a problem that detection was difficult. Further, when a hole for inserting a sensor or a tap for a screw is formed as a pre-stage of forming the dedicated passage, there is a problem that the strength of the pipe is reduced. In particular, if a plurality of holes for inserting sensors or taps for screws are formed in the peripheral wall of the pipe, the strength of the pipe is further reduced.

Further, since the pipe peripheral wall is not a flat surface but a curved surface, it is difficult to determine an attachment angle for forming the dedicated passage on the curved surface. In particular, the work time when performing the mounting work was to be greatly increased. Further, when welding a sensor holding bracket such as a socket to the peripheral wall of the pipe, it is indispensable to perform the work of cutting the connection portion of the socket into a round pipe shape.

When the steady fluid in the flow path is observed, an inner laminar flow (also referred to as a main flow) flows near the center thereof, and an outer laminar flow flows near a position distant from the center (the inner wall position of the flow passage). I have. The inner laminar flow has a strong flow, the temperature and pressure of the fluid are stable, and the temperature distribution is highest at the center of the interior flow.

On the other hand, since the outer laminar flow always receives the frictional resistance of the inner wall of the pipe, the flow is weaker than the inner laminar flow.
A part of the outer laminar flow is an unstable flow that repeats separation and fusion, generating irregular waves and eddies. The temperature distribution of the outer laminar flow is lower than that of the inner laminar flow due to the influence of heat absorbed into the pipe and radiant heat loss from the pipe to the outside, and has an irregular value due to wave motion and eddy current.

In general, a sensing unit such as a temperature sensor should be installed in a region where the temperature is stable or in a position indicating the highest temperature in the flow path. As a result, the sensing unit is located at the center of the inner laminar flow as described above. More likely to be set.

However, since the maximum temperature region at the center of the inner laminar flow exists in a small dot shape, it has been extremely difficult to set the sensing portion of the sensor at the above position. In addition, the thin laminar flow of the inner laminar flow becomes unstable due to the influence of waves and vortices from the outer laminar flow direction, so that even if a high-sensitivity sensor is installed, the temperature cannot be detected accurately. Was.

For this reason, although it is indispensable to set the sensing portions of various sensors so as to be located in the above-mentioned inner layer flow, conventionally, a position to which the sensor is to be attached is provided in advance. Was not
It has been extremely difficult to set the sensing part of the sensor at the desired position.

Next, in the dedicated passage for fluid injection, it is necessary to position the tip of the fluid injection pipe installed in the dedicated passage so as to reach the inner layer flow from the viewpoint of the fluid mixing effect. This is the most preferable (see FIG. 9). However, in the past, there was no fluid passage provided in advance, and the tip of the fluid injection pipe was simply extended from the peripheral wall of the pipe to reach the inner layer flow (main flow). The frictional resistance was increased to hinder smooth flow, and a new problem of turbulence occurred in the fluid that received the frictional resistance.

Therefore, according to the present invention, the above-described dedicated passage is provided at a flat surface position of the pipe joint, and the end of the dedicated passage is a position not obstructing the flow of the fluid, and the mixing efficiency of the fluid is excellent. It is intended to eliminate all the above-mentioned problems by being formed so as to come to a position.

[0016]

According to a first aspect of the present invention, there is provided a pipe joint for connecting a first pipe and a second pipe forming a flow path, wherein the pipe joint connects the first pipe. A first connecting pipe, a second connecting pipe connecting the second pipe, and a box connecting the first connecting pipe and the second connecting pipe, at least one surface of an outer wall surface of the box is a flat surface. The flow path diameter inside the box body is formed so as to be larger than the flow path diameters of the first connection pipe and the second connection pipe, and a dedicated passage serving as a sensor insertion port is formed on the flat surface. It is a pipe joint with a dedicated passage.

According to a second aspect of the present invention, there is provided a pipe joint for connecting a first pipe and a second pipe forming a flow path, wherein the pipe joint comprises a first connecting pipe connecting the first pipe, A second connecting pipe for connecting the second pipe, and a box connecting the first connecting pipe and the second connecting pipe, at least one surface of an outer wall surface of the box is formed as a flat surface, and the inside of the box is formed. A pipe joint with a dedicated passage, wherein the passage diameter is formed to be larger than the passage diameter of the first connection pipe and the second connection pipe, and a dedicated passage serving as a fluid inlet is formed on the flat surface. It is.

According to a third aspect of the present invention, there is provided the pipe joint with a dedicated passage according to the first or second aspect, wherein the box body of the pipe joint is a rectangular column-shaped box body.

According to a fourth aspect of the present invention, there is provided the pipe joint with a dedicated passage according to the first or second aspect, wherein the box body of the pipe joint is a triangular prism-shaped box body.

According to a fifth aspect of the present invention, the sensor at the tip of the sensor housed in the dedicated passage serving as the sensor insertion port is located at the widened portion of the inner layer flow that appears near the center of the fluid inside the box. The pipe joint with a dedicated passage according to any one of claims 1, 3, and 4 having the above configuration.

Further, in the invention according to claim 6, the end of the dedicated passage serving as the fluid inlet is directed to a site where a ring-shaped rotary vortex generated by separation of the outer layer flow is formed on the upstream side inside the box. A pipe joint with a dedicated passage according to any one of claims 2, 3, and 4.

In the pipe joint having the dedicated passage serving as the sensor insertion port according to the present invention described above, the dedicated passage is formed on a flat surface formed in a part of the box, so that the strength of the box is impaired. Therefore, the work of forming the dedicated passage is easy and the sensor can be stably mounted.

In the pipe joint having the dedicated passage serving as the sensor insertion port, the sensing portion at the tip of the sensor housed in the dedicated passage is located at the widened portion of the inner layer flow of the fluid. In addition, the sensor of the sensor has a feature that it can accurately measure a state in which temperature, pressure, and the like are stable.

Further, the pipe joint according to the present invention, in which a dedicated passage serving as a fluid injection port is formed, has a dedicated passage formed on a flat surface formed in a part of the box, so that the strength of the box is reduced. There is no loss, and the task of forming the dedicated passage is also simplified.

In the pipe joint having the dedicated passage serving as the fluid inlet, the end of the dedicated passage is directed to the ring-shaped rotating vortex generating portion of the outer laminar flow. Thus, it is possible to quickly stir the entire region of the outer laminar flow, and to efficiently mix the outer laminar flow into the interior flow in a short time.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of a pipe joint with a dedicated passage serving as a sensor insertion port according to the present invention, FIG.
3 is a front view of the same, FIG. 3 is a sectional view taken along line AA in FIG. 1, and FIG.
FIG. 3 is a sectional view taken along line BB in FIG. 2.

A pipe joint 1 with a dedicated passage serving as a sensor insertion port shown in FIG. 1 is a first pipe (not shown).
Connecting pipe, a second connecting pipe 3 for connecting a second pipe (not shown), and a square connecting the first connecting pipe 2 and the second connecting pipe 3 in a straight line. And a columnar box 4.

The first connecting pipe 2 and the second connecting pipe 3 are formed of, for example, stainless steel pipes. Similarly, the box 4 is formed of a rectangular column-shaped box made of the same material. The first connection pipe 2 and the second connection pipe 3 are attached to the surface by appropriate means such as welding, and the inside thereof is a linear flow path 5.
Formed.

The box 4 has at least one outer wall formed on a flat surface 6 (in the embodiment shown in FIGS. 1 to 6, since the box 4 has a quadrangular prism shape, all six surfaces of the box are flat surfaces). A dedicated passage 7 serving as a sensor insertion port is formed in the flat surface 6, and a socket 9 for supporting the sensor 8 is fixed to the dedicated passage 7 by welding means.

Even when a dedicated passage 7 serving as a plurality of sensor insertion ports is formed on the flat surface 6 of the box 4, the box 4 has corners 10..., Thereby maintaining the strength of the box 4. be able to. In addition, since the dedicated passage 7 is formed on the flat surface 6, the dedicated passage 7 can be formed more stably and easily than when the dedicated passage is formed on a curved surface such as a pipe. Furthermore, although the socket 9 may be attached to the flat surface 6, the socket 9 can be naturally attached stably.

The socket 9 is, for example, formed of a cylindrical body having an internal thread formed on an inner surface thereof. As shown in FIGS. 3 and 4, the socket 9 is mounted so that an external thread 8a of the sensor 8 can be screwed thereto. Can be Also, the sensor 8
An example is a temperature sensor using a thermocouple, but it is also possible to use a pressure sensor, a fluid detection sensor, or a multifunctional sensor.

As shown in FIG. 3, the first connection pipe 2 and the second connection pipe 3 are connected by a pipe connection 1 with a dedicated passage 7 serving as a sensor insertion port, so that the first connection pipe 2, the first connection pipe 2, and the box are connected. Channel 5 leading to second connecting pipe 3 via body 4
Is completed, and a fluid flows through the flow path 5.

Now, looking at the flow path 5 of the pipe joint 1,
Flow path diameter D1 of each of the first connection pipe 2 and the second connection pipe 3,
Since the flow path diameter D3 inside the box body is formed to be larger than D2, the fluid flowing through the flow path 5 naturally widens inside the box body 4, and this widening causes the inner layer The flow is also widened at the same time.

Since the sensing portion 8b at the tip of the sensor 8 is located at the widened portion 11 of the inner layer flow, the range in which the sensing portion 8b is to be located is widened, so that the sensor 8 can be easily attached to the exclusive passage 7, and furthermore, Can measure the temperature and pressure in a stable state of the inner laminar flow, so that accurate measurement is possible.

On the other hand, due to the dimensional difference between the flow path diameters D1, D2, and D3, the widened portion 11 of the inner layer flow is formed inside the box 4, and as shown in FIG. A ring-shaped rotating vortex generation site 12 appears.

The ring-shaped rotary vortex is a portion in which a part of the outer laminar flow is separated, and is a portion where the fluid is vigorously stirred and mixed. In the present invention, the ring-shaped rotary vortex generating portion 12 is formed so that the end of the dedicated passage 13 serving as a fluid injection port is directed. And can be efficiently stirred and mixed in a short time.

A pipe joint 2 according to another embodiment
Reference numeral 1 denotes a case in which the box 4 is changed from a quadrangular prism to a triangular prism box 24, and the flow path 25 is bent. The curved passage 25 is formed so that the intersection angle between the first connection pipe 2 and the second connection pipe 3 is approximately 30 to 120 degrees, but in FIG. 7 and FIG. An example is shown.

When this triangular prism-shaped box body 24 is used, a curved flow path 25 is formed instead of a straight flow path. The description is omitted because it is the same as in the case of. Of course, it is sufficient that the box 24 is formed on five sides and at least one of them is formed on a flat surface, but in FIGS. 7 and 8, an example in which all five sides of the box are formed on a flat surface is sufficient. Is shown.

[0039]

Thus, the present invention has a box having at least one flat surface, and a dedicated passage is formed in this flat surface. Therefore, even if a dedicated passage is formed on the flat surface of the box, the strength of the pipe joint can be maintained. In addition, since the dedicated passage is formed on the flat surface, the dedicated passage can be easily processed in a short time.

Further, in the dedicated passage serving as the sensor insertion port, since the sensing portion at the tip of the sensor housed in the dedicated passage is located at the widened portion of the inner layer flow that appears near the center of the fluid inside the box, accurate detection is possible. There is a feature that can perform various measurements.

Further, in the dedicated passage serving as the fluid injection port, the tip of the dedicated passage is directed to the ring-shaped rotary vortex generating portion of the outer laminar flow.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of a pipe joint with a dedicated passage serving as a sensor insertion port according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG. 2;

FIG. 5 is a longitudinal sectional view showing a second embodiment of a pipe joint with a dedicated passage serving as a fluid injection port according to the present invention.

FIG. 6 is a sectional view taken along line CC in FIG.

FIG. 7 is a longitudinal sectional view showing a third embodiment of a pipe joint with a dedicated passage serving as a sensor insertion port according to the present invention.

FIG. 8 is a longitudinal sectional view showing a fourth embodiment of a pipe joint with a dedicated passage serving as a fluid injection port according to the present invention.

FIG. 9 is a conventional explanatory view showing a state in which the tip of a fluid injection pipe is allowed to reach an inner laminar flow.

FIG. 10 is a conventional explanatory view showing a state in which the tip of a fluid injection tube is allowed to reach an outer laminar flow.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21 ... Pipe joint 2 ... 1st connection pipe 3 ... 2nd connection pipe 4, 24 ... Box body 5, 25 ... Flow path 6 ... Flat surface 7 ... Exclusive passage which becomes a sensor insertion port 8 ... Sensor 8a ... Sensor Male thread 8b ... Sensor sensing part 9 ... Socket 10 ... Corner of box body 11 ... Inner laminar flow widening part 12 ... Outer laminar flow ring-shaped vortex generating part 13 ... Exclusive passage to be fluid inlet D1 ... First connection pipe D2: flow path diameter of the second connection pipe D3: flow path diameter of the box

Claims (6)

[Claims] 1. A pipe joint for connecting a first pipe and a second pipe forming a flow path, wherein the pipe joint includes a first connecting pipe connecting the first pipe and a second connecting pipe connecting the second pipe. The two connecting pipes, and a box body connecting the first connecting pipe and the second connecting pipe, at least one surface of the outer wall surface of the box body is formed as a flat surface, and the flow path diameter inside the box body is the first connecting pipe. And a pipe joint with a dedicated passage formed so as to be larger than the flow path diameter of the second connection pipe, and a dedicated passage serving as a sensor insertion port is formed on the flat surface. 2. A pipe joint for connecting a first pipe and a second pipe forming a flow path, wherein the pipe joint includes a first connecting pipe connecting the first pipe and a second connecting pipe connecting the second pipe. The two connecting pipes, and a box body connecting the first connecting pipe and the second connecting pipe, at least one surface of the outer wall surface of the box body is formed as a flat surface, and the flow path diameter inside the box body is the first connecting pipe. And a pipe joint with a dedicated passage formed so as to be larger in size than the flow path diameter of the second connection pipe, and a dedicated passage serving as a fluid inlet is formed in the flat surface. 3. The pipe joint with a dedicated passage according to claim 1, wherein the box body of the pipe joint is a quadrangular prism-shaped box body. 4. The pipe joint with a dedicated passage according to claim 1, wherein the box body of the pipe joint is a triangular prism-shaped box body. 5. A sensor at a tip end of a sensor housed in a dedicated passage serving as a sensor insertion port is located at a widened portion of an inner layer flow appearing near a center of a fluid inside a box body. The pipe joint with a dedicated passage according to any one of claims 1, 3 and 4. 6. The end of a dedicated passage serving as a fluid injection port is directed to a site where a ring-shaped rotating vortex generated by separation of an outer laminar flow is formed on the upstream side inside the box. The pipe joint with a dedicated passage according to claim 4.