CN211373949U - Leakage detection device for multiple groups of heat exchange tubes of heat exchanger - Google Patents

Abstract

The utility model discloses a leak hunting device for heat exchanger class multiunit heat exchange tube, including stand, two first telescopic links, two second telescopic links, a plurality of end cap and a plurality of head of admitting air, first telescopic link supports the end cap and the head of admitting air through the mount pad, and the second telescopic link supports the inner wall of steam chamber at the opposite side and provides thrust, and air compressor is toward heat exchange tube input atmospheric pressure then pressurize and detect. The leak detection tool can be assembled at one time to realize leak detection operation with single hole and multiple holes, thereby improving the working efficiency; and the leak detection tool is small in size, can realize the pressurizing leak detection operation at all positions in the steam chamber, and does not have the problem of space interference. The operator can be operated by one person, the labor intensity is reduced, and the matching requirement is reduced. This utility model is used for nuclear power generating set overhauls the field.

Description

Leakage detection device for multiple groups of heat exchange tubes of heat exchanger

Technical Field

The utility model relates to a nuclear power unit overhauls the field, especially relates to a leak hunting device that is used for heat exchanger class multiunit heat exchange tube.

Background

A steam-water separation Reheater (hereinafter referred to as MSR) is a special key large-scale device for improving the overall heat efficiency of a power plant and protecting a steam turbine in a conventional island of a nuclear power plant. The main functions of the device realized in the reheating system of the conventional island of the nuclear power station are energy conservation and improvement of the work efficiency of a steam turbine, and the device is integrated with the steam turbine and a generator and is one of important core devices in the conventional island of the nuclear power station. And (4) the nuclear power station unit needs to be shut down and overhauled regularly about 12-18 months according to the operation requirement. During the period, power station workers need to quickly and accurately perform pressure test leak detection on the MSR pipe system so as to ensure the normal operation of equipment. The situation of the leakage detection part of the MSR piping system is shown in figure 1.

The MSR comprises a steam type inner cavity, a heat exchange pipe system, a horizontal partition plate, a plurality of connecting pipes and channels, wherein the heat exchange pipe system is positioned on the left side, the heat exchange pipe system comprises a plurality of U-shaped heat exchange pipes, and an upper side inlet and a lower side outlet of each U-shaped heat exchange pipe are seen in figure 1. Fig. 2 is a right side view of fig. 1, and it can be seen that the MSR is about 3m long, and there are manholes on the left and right sides, from which all tools and personnel enter and exit during pressure testing, and the oversized tools need to be disassembled and assembled.

The existing leak detection mode needs an operator to prop against a plug corresponding to a pipe hole by hands below a horizontal partition plate, and the operator can operate a pressure gun above the horizontal partition plate and exert force to press the pressure gun to complete detection of one or a few pipes. Due to the obstruction of the horizontal partition plate, the lower space is small, the labor intensity is high, the operation is very inconvenient and the efficiency is low. In addition, the problem that the pressurizing gun has space interference at two ends of the steam type inner cavity is solved, and all heat exchange tubes cannot be detected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a leak hunting device for heat exchanger class multiunit heat exchange tube that convenient to use, detection efficiency are high.

The utility model adopts the technical proposal that:

a leak detection device for multiple groups of heat exchange tubes in a heat exchanger comprises: the upright post provides supporting force; the two first telescopic rods are respectively positioned at the upper side and the lower side of the left side of the upright post, and each first telescopic rod comprises a fixed end connected with the upright post and a movable end movably arranged on the fixed end; the two second telescopic rods are respectively positioned at the upper side and the lower side of the right side of the upright post, and each second telescopic rod comprises a fixed end connected with the upright post and a movable end movably arranged on the fixed end; the two mounting seats are respectively arranged at the movable end of the first telescopic rod, one of the mounting seats is provided with a plurality of plugs capable of plugging the pipe orifices of the heat exchange pipes, the other mounting seat is provided with air inlet heads which are equal to the plugs in number and can be inserted into the pipe orifices of the heat exchange pipes, and each air inlet head is provided with an air inlet interface for connecting an air inlet pipe; and the two buffer parts are respectively arranged at the movable end of the second telescopic rod and are used for connecting the inner cavity.

As an improvement of the scheme, the air inlet head comprises a body part and an air inlet interface fixed on the side surface of the body part, the air inlet interface is communicated with the center of the body part to form an air supply channel, and the top end of the body part is provided with a rubber ring.

As an improvement of the scheme, the plug is of a revolving body structure and is provided with a plurality of annular shaft shoulders or annular grooves, and the top end of the plug is provided with a rubber ring.

As an improvement of the above scheme, the fixed end of the first telescopic rod is of a cylindrical structure, the side wall of the cylindrical structure is provided with at least two long notches, the long notches extend along the axial direction on the cylindrical structure and then are bent to the circumferential direction to continue extending, the part of the long notches in the circumferential direction is located on one side away from the stand column, the side wall of the movable end of the first telescopic rod is provided with a protrusion capable of being embedded into the long notches, and the movable end is telescopic and deflects relative to the fixed end under the guidance of the long notches.

As an improvement of the scheme, one side of the buffer piece, which is far away from the upright post, is an arc surface which can be attached to the inner cavity.

As an improvement of the scheme, the axial leads of the two first telescopic rods and the two second telescopic rods are in the same plane.

As an improvement of the scheme, the telescopic device further comprises a temporary support rod, wherein the temporary support rod is arranged on the lower side of one of the first telescopic rods and provides supporting force.

As an improvement of the scheme, the air-conditioning system further comprises an air compressor, wherein the output end of the air compressor is respectively connected to each air inlet head through each air delivery pipe.

The utility model has the advantages that: the leak detection tool can be assembled at one time to realize leak detection operation with single hole and multiple holes, thereby improving the working efficiency; and the leak detection tool is small in size, can realize the pressurizing leak detection operation at all positions in the steam chamber, and does not have the problem of space interference. The operator can be operated by one person, the labor intensity is reduced, and the matching requirement is reduced.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a front sectional view of a heat exchanger in the present embodiment;

fig. 2 is a right side sectional view of a heat exchanger in the present embodiment;

fig. 3 is a perspective view of leak detection apparatus in this embodiment;

fig. 4 is a state diagram of the leak detection apparatus in this embodiment;

fig. 5 is a sectional view of the intake head in the present embodiment;

FIG. 6 is a sectional view of the bulkhead in this embodiment;

fig. 7 is a perspective view of the fixed end of the first telescopic link in this embodiment.

Detailed Description

In the description of the present invention, it should be understood that the orientation or positional relationship indicated, for example, up, down, front, rear, left, right, etc., referred to the orientation description is the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of the description of the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of meanings are one or more, a plurality of meanings are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms above, below, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution in the present invention.

Referring to fig. 1 to 7, the utility model relates to a leak detection device for heat exchanger type multiunit heat exchange tube and a use method.

As shown in fig. 1, the left side of the vapor chamber 11 is provided with a plurality of heat exchange tubes 12, in this embodiment, the heat exchange tubes 12 are U-shaped, and the bent portions of the heat exchange tubes 12 are not shown in fig. 1, it can be seen that the upper half part of the vapor chamber 11 is provided with inlets or outlets of the heat exchange tubes 12, and the lower half part is correspondingly provided with outlets or inlets of the heat exchange tubes 12. Access is gained from a central manhole 13 and a horizontal partition 14 is also typically provided in the steam chamber 11 for standing. When the traditional method is used for detection, the lower heat exchange tube 12 is generally blocked, an operator uses a pressing gun to press the corresponding upper end of the heat exchange tube 12, and the pressing gun is inconvenient to reach the edges of the left side and the right side, so that interference is easy to occur. In fig. 2 it can be seen that a steam chamber 11 has a very large number of heat exchange tubes 12, and the operator slowly detects the other side from one side, which is inefficient and labor intensive.

As shown in fig. 3, the leak detection device mainly includes a vertical column 30, two first telescopic rods 40, two second telescopic rods 50, a plurality of plugs 61 and a plurality of air inlet heads 62, wherein the two first telescopic rods 40 are located at the upper and lower sides of the left side of the vertical column 30, and the two second telescopic rods 50 are located at the upper and lower sides of the right side of the vertical column 30. The first telescopic rod 40 comprises a fixed end 41 connected with the upright 30 and a movable end 42 movably arranged on the fixed end 41, and the second telescopic rod 50 also comprises a fixed end connected with the upright 30 and a movable end movably arranged on the fixed end. The movable end 42 of the first telescopic rod 40 is provided with mounting seats 60, one of the mounting seats 60 is provided with a plurality of air inlet heads 62, and the other mounting seat 60 is provided with plugs 61 with the number equal to that of the air inlet heads 62.

As shown in fig. 4, when in use, the plurality of air inlets 62 and the plurality of plugs 61 are all positioned in the same vertical plane, and the plurality of heat exchange tubes 12 in the vertical column are detected at one time. The movable end 42 of the first telescopic rod 40 extends out by a proper length, an air inlet head 62 and a plug 61 are inserted into the heat exchange tube 12, the air inlet head 62 is used for inputting air pressure, and the plug 61 is used for preventing air pressure from leaking; the movable end of the second expansion link 50 is extended to a proper length for abutting against the inner cavity of the steam chamber 11, providing a force for stably inserting the plug 61 and the inlet 62 into the heat exchange pipe 12.

As shown in fig. 5 and 6, the air inlet head 62 includes a body portion and an air inlet interface fixed on the side surface of the body portion, the air inlet interface is inserted into the body portion and then welded and fixed into an integral body, the left side of the air inlet head 62 is used for inserting the heat exchange tube 12, the integral body looks like an L shape, and the air inlet interface is communicated with the center of the body portion to form an air supply channel. The plug 61 is only inserted into the heat exchange tube 12, so that the structure is simpler and the plug is made of solid materials. In other embodiments, the air inlet head 62 may be in the form of a straight pipe, and the structure of the mounting seat 60 is appropriately adjusted to connect the air supply pipes. A schematic representation of the air compressor 20 can be seen in fig. 3, wherein the air compressor 20 delivers air pressure to a manifold that delivers air pressure to each of the inlet headers 62 via each of the branches.

In the embodiment, the mounting base 60 is a channel steel, the number and the orientation of the plugs 61 and the air inlet heads 62 are designed according to the spacing and the number of the heat exchange tubes 12, and then the plugs 61 and the air inlet heads 62 are welded on the mounting base 60; in other embodiments, the mounting seat 60 may be further optimized, and the plug 61 and the air inlet 62 are both detachably connected to the mounting seat 60, for example, a dovetail groove is provided on the mounting seat 60, and the plug 61 and the air inlet 62 are also provided with corresponding structures and are clamped with each other at one side.

In this embodiment, the body of the intake head 62 and the plug 61 are both of a revolving structure, so that a plurality of annular shoulders or annular grooves are conveniently arranged on the body, and a plurality of annular shoulders or annular grooves are conveniently arranged on the plug 61. An O-shaped rubber ring is further arranged on the annular groove. In fig. 5, it can be seen that the middle position of the body and the middle position of the plug 61 are both large-area shoulders, and the shoulders can properly abut against the O-shaped rubber ring to limit the limit position of the O-shaped sealing ring.

The first and second telescoping rods 40, 50 primarily perform a telescoping and jacking function, optionally with an electric push rod, hydraulic rod, or the like. As shown in fig. 7, the present embodiment employs a telescopic rod in a manual telescopic manner. The fixed end 41 of the first telescopic rod 40 is a cylindrical structure, the side wall of the cylindrical structure is provided with two long notches 43, the included angle between the two long notches 43 is 180 degrees, the long notches extend on the cylindrical structure along the axial direction and then bend to the circumferential direction to continue to extend, the extending angle in the axial direction is 90 degrees, and the part of the long notches in the circumferential direction is positioned on one side far away from the upright post 30; if three long notches are arranged, the included angle between two adjacent long notches can be 120 degrees, and the angle extending in the circumferential direction is properly reduced. The movable end 42 of the first telescopic rod 40 is a cylindrical structure inserted into the fixed end 41, and a protrusion capable of being inserted into the long notch 43 is disposed on a side wall thereof, and the movable end 42 is guided by the long notch 43 to be extended and deflected relative to the fixed end 41. When the movable end 42 is moved to the proper position, the outermost long notch 43 will limit the retraction of the movable end 42 and tighten the locking position of the set screw on the movable end 42.

Of course, the fixed end 41 and the movable end 42 can also be in the form of a shift lever or a pull rod, so that the quick assembly and disassembly are convenient. The second telescopic rod 50 may have the same structure as the first telescopic rod 40; however, in this embodiment, the second telescopic rod 50 is in a screw telescopic form. The fixed end and the movable end of the second telescopic rod 50 are connected through a screw rod, a nut is arranged on the screw rod, and the movable end is ejected out by rotating the nut.

Preferably, in order to stabilize the force applied to the first telescopic rod 40, the axial lines of the two first telescopic rods 40 and the two second telescopic rods 50 are all in the same plane.

Preferably, in order to make the movable end of the second telescopic rod 50 better fit the inner cavity of the steam chamber 11, the movable end of the second telescopic rod 50 is provided with a buffer member 63, and one side of the buffer member 63 away from the upright 30 is an arc surface capable of fitting the inner cavity, or the buffer member 63 is a sphere. The buffer member 63 is mainly adjusted according to the inner cavity structure, and other structures are not described herein.

Preferably, in order to keep the balance of the whole leak detection device, a temporary supporting rod 70 may be additionally provided, and the temporary supporting rod 70 is used for supporting the first telescopic rod 40, generally the fixed end 41. The upright 30 and the temporary stay 70 may form two support points; after the temporary stay 70 is arranged, the column 30 may be supported by using only the temporary stay 70. The temporary stay bar 70 is generally arranged on the first telescopic rod 40 positioned at the lower side, and meanwhile, the temporary stay bar 70 is also a telescopic rod, so that the height is conveniently adjusted; for example, the fixed end 41 of the first telescopic rod 40 is welded with a vertical screw, and the screw is threadedly connected with a base, so that the support height of the base can be adjusted by rotating the base.

As for the method of use, the following description can be referred to.

S1, opening a manhole 13 on at least one side, removing an exhaust flange, an expansion joint and a throttling hole pipe, preparing an air compressor 20, configuring a multi-way valve, a stop valve and an air supply pipe, and checking the integrity and the tightness of each pipeline, each valve, each air inlet head 62 and each plug 61;

s2, placing the leak detection device into an inner cavity, keeping each plug 61 and each air inlet head 62 in the same vertical plane, inserting a plurality of plugs 61 into the corresponding upper side or lower side heat exchange tubes 12, inserting a plurality of air inlet heads 62 into the heat exchange tubes 12 on the other side, extending two first telescopic rods 40 to tightly push each plug 61 and each air inlet head 62, extending two second telescopic rods 50 to tightly push the inner cavity, and connecting each air inlet tube with the corresponding air inlet head 62;

s3, pressurizing by an air compressor 20, wherein the output pressure is 0.6-0.8 MPa, if the heat exchange tube 12 can continuously maintain the pressure and has no abnormal sound, detecting to be qualified, unloading the air pressure in the heat exchange tube 12 after the detection is finished, loosening the two first telescopic rods 40 and the two second telescopic rods 50, and transferring the leakage detecting device to the next station;

s4, repeating the steps S2 and S3 to complete the detection of other heat exchange tubes 12.

The leak detection tool can be assembled at one time to realize leak detection operation with single hole and multiple holes, thereby improving the working efficiency; the leak detection tool is small in size, can realize pressure leak detection operation at all positions in the steam chamber 11, and does not have the problem of spatial interference. The operator can be operated by one person, the labor intensity is reduced, and the matching requirement is reduced.

Of course, the design creation is not limited to the above embodiments, and the combination of different features of the above embodiments can also achieve good effects. Those skilled in the art can make equivalent changes or substitutions without departing from the spirit of the present invention, and such equivalent changes or substitutions are included in the scope defined by the claims of the present application.

Claims (8)

1. The utility model provides a leak hunting device for heat exchanger class multiunit heat exchange tube which characterized in that includes:

the upright post provides supporting force;

the two first telescopic rods are respectively positioned at the upper side and the lower side of the left side of the upright post, and each first telescopic rod comprises a fixed end connected with the upright post and a movable end movably arranged on the fixed end;

the two second telescopic rods are respectively positioned at the upper side and the lower side of the right side of the upright post, and each second telescopic rod comprises a fixed end connected with the upright post and a movable end movably arranged on the fixed end;

the two mounting seats are respectively arranged at the movable end of the first telescopic rod, one of the mounting seats is provided with a plurality of plugs capable of plugging the pipe orifices of the heat exchange pipes, the other mounting seat is provided with air inlet heads which are equal to the plugs in number and can be inserted into the pipe orifices of the heat exchange pipes, and each air inlet head is provided with an air inlet interface for connecting an air inlet pipe;

and the two buffer parts are respectively arranged at the movable end of the second telescopic rod and are used for connecting the inner cavity.

2. Leak detection apparatus according to claim 1, wherein: the air inlet head comprises a body part and an air inlet interface fixed on the side face of the body part, the air inlet interface is communicated with the center of the body part to form an air supply channel, and the top end of the body part is provided with a rubber ring.

3. Leak detection apparatus according to claim 2, wherein: the plug is of a revolving body structure and is provided with a plurality of annular shaft shoulders or annular grooves, and the top end of the plug is provided with a rubber ring.

4. Leak detection apparatus according to claim 3, wherein: the utility model discloses a telescopic column, including first telescopic link, the stiff end of first telescopic link is the drum structure, and the lateral wall of this drum structure is equipped with and sets up two at least long breachs, and the axial direction of edge extension then buckle to the circumferential direction and continue to extend in the drum structure of long breach, and this part of long breach in the circumferential direction is in the one side of keeping away from the stand, the lateral wall of the expansion end of first telescopic link is equipped with the arch that can imbed long breach, and the expansion end is flexible the deflection relative stiff end under the guide of long breach.

5. Leak detection apparatus according to claim 4, wherein: one side of the buffer piece, which is far away from the upright post, is an arc surface which can be attached to the inner cavity.

6. Leak detection apparatus according to claim 1, wherein: the axial leads of the two first telescopic rods and the two second telescopic rods are in the same plane.

7. Leak detection apparatus according to any one of claims 1 to 6, characterized in that: the temporary support rod is arranged on the lower side of one of the first telescopic rods and provides supporting force.

8. Leak detection apparatus according to any one of claims 1 to 6, characterized in that: the air compressor is characterized by further comprising an air compressor, wherein the output end of the air compressor is connected to each air inlet head through each air feeding pipe.

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