JPH11315960A - Pipe supporting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely hold a pipe put through a conduit by utilizing the temperature change of atmosphere where the conduit is installed. SOLUTION: A supporting device 19 holds a pipe 21 in a strut (conduit) 1 installed in atmosphere where temperature changes. In this case, the supporting device 19 is provided with a support 22 provided in the pipe 21. and s support receiver 23 provided in the strut 1. The support 22 and the support receiver 23 are arranged such that by the thermal deformation of at least one of them when the atmosphere changes to a specified temperature, the support 22 is held by the support receiver 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe supporting structure for holding a pipe inserted into a pipe installed in an atmosphere where the temperature changes, and particularly to a jig such as a clamp or a bolt. The present invention relates to an apparatus which can easily and surely hold a pipe in a pipeline by utilizing a temperature change of an atmosphere without using a pipe.

[0002]

2. Description of the Related Art An atmosphere in which the temperature changes, for example, from normal temperature to a high temperature, is found in the vicinity of an internal combustion engine such as a gas turbine engine. This is because while the engine is stopped, the vicinity of the engine is at room temperature, while when the engine is running, it receives operating heat and becomes a high temperature atmosphere. As a pipe installed in such an atmosphere in which the temperature changes, there is a strut of an aircraft gas turbine engine or the like. The strut is, for example, a radial tubular member on a front frame between a fan and a compressor in a turbofan engine, and has oil therein for lubricating bearings, air for cooling and sealing, fuel, etc. The piping for sending is inserted.

[0003]

By the way, as the length of the strut (pipe) increases, the length of the pipe inserted therein also increases, and the natural frequency of the pipe decreases. If the natural frequency approaches the frequency of a gas turbine engine or the like, for example, there is a problem that the piping may be damaged due to resonance. In particular, in recent years, in order to improve the operational efficiency of the aircraft engine between the high speed range and the low speed range, there is a turbofan engine which incorporates a ram pressure utilizing jet engine operated at high speed around the periphery of the turbofan engine. If the distance between the outermost shell and the turbine shaft is long, the strut naturally becomes long, which causes the above-mentioned problem.

In order to prevent such resonance of the pipe, the natural frequency of the pipe is increased by changing the diameter or length of the pipe, or by holding the middle of the pipe with a jig such as a clamp or a bolt. It is also conceivable to deviate from this frequency. However, since the diameter and length of the pipe are determined based on the setting of the flow rate of air and oil, changing the diameter and length of the pipe as described above is not preferable in engine design.

Further, even if the pipe is fixed in the middle of the pipe with a jig such as a clamp or a bolt, a gap or loosening is likely to occur due to the vibration of the engine, and the natural frequency of the pipe is reliably controlled by a jig such as a clamp. Is difficult. Furthermore, since the clamp or the like is operated in a narrow pipe such as a strut, workability is poor. For example, when replacing a pipe, a troublesome operation such as removal and attachment of the clamp or the like is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and utilizes a temperature change of an atmosphere in which a pipe is installed to easily and reliably connect a pipe inserted through the pipe. It is an object of the present invention to provide a pipe support structure capable of holding a pipe.

[0007]

Means for Solving the Problems To solve the above problems, the invention according to claim 1 is a pipe support structure for holding a pipe in a pipe installed in an atmosphere in which the temperature changes, wherein A support is provided, and a support receiver is provided in the pipeline.The support and the support receiver are arranged so as to hold the support in the support receiver by thermal deformation of at least one when the atmosphere changes to a predetermined temperature. Technology is adopted. In this piping support structure, since the support or the support receiver is deformed in a predetermined temperature atmosphere and the support is held by the support receiver, the pipe can be easily and securely held in the pipeline without using a jig such as a clamp. The natural frequency can be increased, and the troublesome work of attaching and detaching the jig is not required, so that the working efficiency can be improved. For example, if the predetermined temperature is set to the average temperature during operation of the gas turbine engine, the strut (pipe) receives the operating heat during operation of the engine, thereby holding the support with the support receiver and supporting a part of the piping. When the strut reaches room temperature after the engine is stopped, the strut returns to the original state, and the holding is released to open the pipe.

According to a second aspect of the present invention, in the piping support structure of the first aspect, a technique is applied in which the support and the support receiver are formed of materials having different coefficients of thermal expansion. In this piping support structure, the support can be held by the support receiver utilizing the difference in thermal expansion between the support and the support receiver, and the support can be efficiently held and opened.

The invention according to claim 3 is the invention according to claim 1 or 2
In the pipe support structure of (1), a technique is employed in which the support receiver includes a concave portion into which the support can be fitted. In this piping support structure, since the support receiver is provided with a concave portion, for example, in the case of the above-described gas turbine engine, when piping is installed in a pipeline at normal temperature, the pipe setting is completed only by fitting the support into the concave portion. Thus, it is possible to easily position the support with respect to the support receiver.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an application example of the present invention to a strut of a gas turbine engine. As shown in FIG. 1, a strut (pipe) 1
Is an inner member 2, an inner tubular member 3, an intermediate member 4,
The outer tubular member 5 and the outer member 6 are formed by being connected to each other by welding or the like. This strut 1 is shown in FIG.
As shown in FIG. 3 and FIG. 3, the front frame 8 of the gas turbine engine 7 is a tubular member provided radially. FIG. 2 is a cross-sectional view schematically showing an engine to which the present invention is applied, and FIG. 3 is a front view showing a front frame used in the engine shown in FIG.

The engine 7 will be described with reference to FIG.
As shown in FIG. 3, a turbine 9 for a high-pressure compressor and a turbine 10 for a low-pressure compressor (fan) are provided, and a core flow for sending air from the fan 11 to the compressor 12 and a bypass flow for use as a thrust as it is It is a turbofan engine that is designed to be divided, and further, a passage 1 for a bypass flow.
Outside of 3, a passage 14 is formed to function as a ramjet engine utilizing the ram pressure at the flight speed.

An outer peripheral housing 15 forming a bypass flow passage 13 and an outermost peripheral housing 16 forming a ramjet engine passage 14 are held by struts 1, respectively. As a result, as shown in FIG. 3, the strut 1 is longer than the ordinary turbofan engine by the amount of holding the outermost peripheral housing 16 for the ramjet engine.

Referring back to FIG. 1, the inner member 2 and the outer member 6 are formed with openings 2a and 6a through which piping is passed. The intermediate member 4 partitions the inside of the strut 1 radially inward and outward, and has an opening 18a for passing a pipe to a predetermined position and a pipe support structure 19 described later.

The inner member 2 supports an inner housing that guides the core flow to the compressor 12, as shown in FIG. Further, as shown in FIG. 2, the intermediate member 4 supports an outer peripheral housing 15 for bypass flow. The outer member 6 supports an outermost housing 16 for a ramjet engine, as shown in FIG.

Various pipes 20 and 21 are inserted through the strut 1 as shown in FIG. 1. The pipe support structure 19 of the present invention has a pipe (here, a small-diameter pipe 21) in which resonance is a problem. Applied to The small-diameter pipe 21 is a pipe for delivering air for sealing, and includes an opening 2a, an inner tubular member 3, an intermediate member 4, an outer tubular member 5, and an outer member 6.
Of the outer end 21
a is held by the outer member 6. The difference from the pipe 20 is that a part is held by the pipe support structure 19 of the intermediate member 4. The pipe 21 has a small diameter unlike the pipe 20, and if the pipe 21 has such a length that is disposed on the long strut 1, the natural frequency becomes low, and the pipe 21 may resonate close to the frequency of the engine 7. It is necessary to increase the natural frequency by holding it in the middle.

The pipe support structure 19 holds a part of the pipe 21 in the strut 1 and includes a support 22 fixed to the pipe 21 and a support receiver 23 provided on the intermediate member 4. . The support 22 is made of a material having a predetermined thermal deformation rate and is formed in a disk shape.
3 and is fixed to a part of the pipe 21. The support receiver 23 includes a recess 24 provided on one surface of the strut 1 of the intermediate member 4, and a communication hole 25 communicating with the recess 24 and penetrating the intermediate member 4.
1 is inserted.

As a material of the support receiver 23, a material having a smaller coefficient of thermal expansion (thermal deformation) than that of the support 22 is used. The concave portion 24 is formed so as to form a gap between the support 22 and the outer periphery of the support 22 when the support 22 is fitted at room temperature. Therefore, as shown in FIG. 4, when the pipe 21 is installed in the strut 1, the positioning of both is completed only by inserting the support 22 into the recess 24 by inserting the support 21 into the communication hole 25 from the end of the pipe 21.

Subsequently, referring to FIGS. 5A and 5B,
A case where a temperature change occurs in the atmosphere in which the struts 1 are installed will be described. First, as shown in FIG.
At normal temperature, the support 22 is
4, the outer periphery 22 of the support 22
a and a gap is formed between the inner wall 24a of the recess 24. Then, from the state shown in FIG.
When the engine 7 operates and the atmosphere around the strut 1 changes to a high temperature due to the operating heat, both the support 22 and the support receiver 23 expand with the heat.

At this time, since the support receiver 23 has a smaller coefficient of thermal expansion, it is less deformed than the support 22, and when the average temperature around the strut 1 is reached when the engine 7 is operating, as shown in FIG. The inner wall 2 of the recess 24
4a sandwiches the outer periphery 22a of the support 22. Accordingly, the support 22 is held by the support receiver 23, and a part of the pipe 21 is held by the intermediate member 4.

As described above, since the support 22 is held by the support receiver 23 using the difference in the amount of thermal deformation caused by the operating heat of the engine 7, the pipe 21 is not operated when the engine 7 is operated without using a jig such as a clamp. Since a part of the vibration is reliably retained, and the natural frequency of the pipe 21 is increased, the frequency is sufficiently higher than the frequency of the engine 7, so that resonance is effectively prevented.

The engine 7 is stopped and the strut 1
When the atmosphere in which is installed reaches room temperature, the support 22 and the support receiver 23 contract and return to the original state shown in FIG. 5A. This eliminates the need for an operation such as installation of a jig after installation of a new pipe 21, and shortens the operation time. However, it is optional whether or not to include the recess 24 as the support receiver 23.

In FIGS. 1, 4 and 5, the support receiver 23 has a smaller coefficient of thermal expansion than the support 22, but is not limited to this. Is changed, the magnitude of the coefficient of thermal expansion is arbitrary as long as at least one of the support 22 and the support receiver 23 is deformed and the support 22 can be held by the support receiver 23. However, as shown in FIG. 5, when the coefficient of thermal expansion of the support receiver 23 is smaller than the support 22, when the temperature changes to a predetermined temperature, the support 22 is greatly deformed, so that the support receiver 23 is efficiently held.

FIG. 6 is a plan view showing another form of the support receiver. In FIG. 6A, a support receiver 27 including a pair of pieces 28 and 29 is provided in the conduit 26. The pieces 28 and 29 are arranged with their curved end faces 28a and 29a facing each other. In a normal temperature atmosphere, a predetermined gap is formed between the end faces 28a and 29a with the outer periphery 22a. The support 22 can be installed. In addition, the one part 28 and 2
9 is different from the one shown in FIG.

When the temperature of the atmosphere in which the pipe 26 is installed rises, as shown in FIG. 6 (b), the pieces 28 and 29 mainly expand by the heat, respectively, so that the support 28 22 is sandwiched and held from both sides. Thus, the pipe 21 is held in the pipe 26 via the support 22 and the pieces 28 and 29. Note that, when the atmosphere in the pipeline 26 returns to normal temperature, the support 22 is released from the pieces 28 and 29 by contraction of each member, as in the case shown in FIG.

However, when the thermal expansion coefficients of the pieces 28 and 29 are smaller than the support 22, or when the thermal expansion coefficients of both parts are the same, and when the temperature is changed to a predetermined temperature in any case, the support 22 The magnitude of the coefficient of thermal expansion is arbitrary as long as the support 22 is sandwiched and held from both sides by expanding at least one of the pieces 28 and 29.

In the above, the temperature change of the atmosphere changes from room temperature to a high temperature, and the rate of thermal change is considered as the coefficient of thermal expansion. However, the present invention is not limited to this. From low to low temperature, and the rate of change in heat can be considered as the rate of heat shrinkage. FIG. 7 shows an application example of the present invention when the temperature of the atmosphere changes from room temperature to low temperature.

In FIG. 7A, a support receiver 31 is provided in the conduit 30 and includes a projecting piece 32 having an opening 33. The projecting piece 32 is formed of a material having a large heat shrinkage with a large deformation amount with respect to a temperature change to a temperature lower than that of the support 22, and the opening 33 is fitted with a predetermined gap with the outer periphery of the support 22 at room temperature. It is formed to be possible.

When the temperature of the atmosphere in which the conduit 30 is installed falls and the support 22 and the projecting piece 32 contract, respectively, due to this temperature decrease, the thermal contraction rate of the projecting piece 32 is large, so that the opening 33 is also supported. It contracts more than 22 and holds the support 22 at a predetermined temperature. Thereby, the pipe 21 is connected to the support 22.
And it is held in the conduit 30 via the protruding piece 32. Note that, when the atmosphere in the pipe 30 returns to normal temperature, the projecting piece 32 (the opening 33) expands to open the support 22, similarly to the above-described support receiver.

In such a pipe support structure, if it is used, for example, in the peripheral part of the apparatus, by setting the temperature at the time of operation of the apparatus to a predetermined temperature, it is possible to maintain the pipe while operating the apparatus while maintaining the pipe. After the operation is stopped, the holding and opening of the pipes are automatically performed in conjunction with the operation and stoppage of the equipment, such as releasing the holding of the pipes. Is controlled reliably. 7 is applicable to an apparatus in which the working space is in a cold region and the storage space after the work is at room temperature.

The various shapes, dimensions, combinations, and the like of the components shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like. For example, the form of the support 22 is not limited to a disk shape, and an arbitrary shape that can be held by the support receiver is selected. Further, the present invention can be applied to a case where the pipe support structure 19 holds a part of the pipe 20 of FIG. Further, the pipe 21 is not limited to being held near the substantially center of the strut (pipe line) 1, and may be arranged so as to be biased to one of the pipes 21 if the natural frequency of the pipe 21 can be increased. It is possible, and moreover, a plurality of pipe support structures 19 may be provided for one pipe.

[0031]

As described above, in the pipe support structure according to the first aspect, a jig such as a clamp is used to hold the support by the support receiver when the support or the support receiver is deformed in a predetermined temperature atmosphere. In addition, the pipe can be easily and reliably held in the pipe to increase its natural frequency, and the troublesome work of attaching and detaching the jig is not required, so that the working efficiency can be improved. Further, for example, if the predetermined temperature is set to the average temperature during operation of the gas turbine engine, the strut (pipe) receives operating heat during operation of the engine, thereby holding the support with the support receiver and supporting a part of the pipe. On the other hand, the present invention can be suitably applied to a pipe in an internal combustion engine in which the strut returns to the normal state when the temperature of the strut reaches room temperature after the engine is stopped, and the pipe is opened by releasing the holding.

In the pipe support structure according to the second aspect, the support can be held by the support receiver by utilizing the difference in thermal expansion between the support and the support receiver, and the support can be efficiently held and opened.

In the pipe support structure according to the third aspect, since the support receiver is provided with the concave portion, when the pipe is installed in the pipe at normal temperature in the example of the gas turbine engine, for example, the support is simply fitted into the concave portion. Thus, the setting of the piping is completed, and the positioning of the support with respect to the support receiver can be easily performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a pipe support structure according to the present invention.

FIG. 2 is a sectional view showing an example of a gas turbine engine to which the present invention is applied.

FIG. 3 is a front view of a front frame used in the engine of FIG. 2;

4 is an enlarged perspective view of a main part of the pipe support structure shown in FIG.

FIG. 5 is a sectional view showing the operation of the pipe support structure,
(A) shows a normal temperature, and (b) shows a high temperature.

6A and 6B are plan views showing another embodiment of the pipe support structure, in which FIG. 6A shows a normal temperature state and FIG. 6B shows a high temperature state.

7A and 7B are plan views showing another embodiment of the pipe support structure, in which FIG. 7A shows a normal temperature state and FIG. 7B shows a low temperature state.

[Explanation of symbols]

 Reference Signs List 1 strut (pipe) 7 gas turbine engine 8 front frame 19 pipe support structure 21 pipe 22 support 23, 27, 31 support receiver 24 recess

Claims (3)

[Claims] 1. A pipe support structure for holding a pipe in a pipe installed in an atmosphere in which the temperature changes, comprising: a support provided in the pipe; and a support receiver provided in the pipe. The pipe support structure, wherein the support and the support receiver are arranged so as to hold the support by the support receiver due to at least one thermal deformation when the atmosphere changes to a predetermined temperature. 2. The support and the support receiver,
The pipe support structure according to claim 1, wherein the pipe support structure is formed of materials having different coefficients of thermal expansion. 3. The piping support structure according to claim 1, wherein the support receiver has a concave portion into which the support can be fitted.