A dry evaporator tube bundle pressure test tool

Abstract

The utility model belongs to the tube bundle pressure applying tool technical field, specifically is a kind of dry evaporator tube bundle pressure test tool, including cylinder body;The cylinder body top is equipped with fluid interface;Both ends of the cylinder body are connected with fixed flange by bolt, the cylinder body is equipped with a pair of tube plate, a group of heat exchange pipes are equipped between a pair of the tube plate, and a group of heat exchange pipes one end and tube plate are fixedly connected, and the other end penetrates tube plate;A pair of the fixed flange opposite end portion is fixedly connected with sealing washer, and a pair of tube plate is contacted with sealing washer;The utility model solves the problem that the air leakage point between the tube plate and heat exchange pipe welded is difficult to detect in prior art, and the problem that the dismounting installation process required for air leakage detection is complicated, finally realizes the accurate, efficient detection of pipe head leakage.

Description

Technical Field

[0001] This utility model belongs to the technical field of tube bundle pressure testing fixtures, specifically a dry evaporator tube bundle pressure testing fixture. Background Technology

[0002] In the field of removable dry evaporator manufacturing, tube bundles are core components. The welding and sealing performance of the heat exchange tubes and tube sheets directly affects the heat exchange efficiency and safety of the evaporator. Therefore, leakage detection is required at the tube head welds.

[0003] The existing dry evaporator tube bundle pressure testing fixtures have the following problems:

[0004] First, the sealing structure is simple, relying solely on the sealing gasket to seal the flange and tube sheet, resulting in poor sealing reliability. During testing, the medium is prone to leaking from the gap, making it impossible to accurately determine whether the leak originates from the pipe head weld. Furthermore, the single sealing method requires tightening bolts to ensure tight contact between the sealing line on one side of the tube sheet and the flange. This operation makes the disassembly and installation of the pressure testing fixtures very laborious and time-consuming.

[0005] Secondly, the lack of an auxiliary positioning structure makes it impossible to ensure that heat exchange tubes and tube sheets of different specifications and quantities are all located in the center of the tooling cylinder, which requires subsequent adjustment of the tube sheet and heat exchange tube positions to avoid the flanges blocking the welding points of the tube heads and affecting the pressure test results. Therefore, this utility model provides a dry evaporator tube bundle pressure test tooling. Utility Model Content

[0006] To address the shortcomings of existing technologies, the following issues need to be resolved: First, the sealing structure is too simple, relying solely on gaskets to seal the flange and tube sheet. This results in poor sealing reliability, making it easy for the medium to leak through gaps during testing, and making it impossible to accurately determine whether the leak originates from the tube head weld. Furthermore, this single sealing method requires tightening bolts to ensure tight contact between the sealing line on the tube sheet and flange side, making the disassembly and installation of the fixture extremely labor-intensive and time-consuming. Second, the lack of auxiliary positioning structures prevents heat exchange tubes and tube sheets of different specifications and quantities from being positioned centrally within the fixture body. This necessitates subsequent adjustments to the tube sheet and heat exchange tube positions to prevent the flange from obstructing the tube head weld points, thus affecting the pressure test results.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A dry evaporator tube bundle pressure testing fixture of this utility model includes a cylinder; a fluid interface is provided at the top of the cylinder; both ends of the cylinder are bolted to fixed flanges; a pair of tube sheets are provided inside the cylinder, and a set of heat exchange tubes is provided between the pair of tube sheets, with one end of the set of heat exchange tubes fixedly connected to the tube sheet and the other end penetrating through the tube sheet; sealing gaskets are fixedly connected to the opposite ends of the pair of fixed flanges, and both tube sheets are in contact with the sealing gaskets; a sealing fastener is provided inside the cylinder, and both tube sheets are sealed and fixed by the sealing fastener and the fixed flanges; a base is fixedly connected to the bottom of the cylinder.

[0008] Preferably, the sealing fastener includes an axial groove and a pushing unit. One end of the cylinder has a set of axial grooves. The ends of the set of axial grooves and the near ends of the tube sheets are both provided with arc-shaped grooves. A set of sliding guide shafts are fixedly connected to the outer circular walls of the tube sheets, and the sliding guide shafts are slidably connected in the arc-shaped grooves. One end of the side wall of the set of arc-shaped grooves is provided with a through groove. An annular groove is provided between the fixed flange and the inside of the cylinder, and the annular groove and the through groove are connected. A sliding ring is fixedly connected to the end of the annular groove by a set of springs. A through groove is provided at the end of the fixed flange. A rubber pad is fixedly connected to the end of the sliding ring, and the rubber pad and the through groove are positioned correspondingly.

[0009] Preferably, the pushing unit includes a pushing block, the pushing block is slidably connected in the through groove, and a pushing plate is rotatably connected between the inner walls of the annular groove via a rotating shaft. One end of the pushing plate corresponds to the position of the pushing block, and the other end corresponds to the position of one end of the sliding ring. The side wall of the pushing block is provided with an inclined surface, and the inclined surface is inclined toward the sliding guide shaft. The fixed flange and the tube sheet are fixed together by positioning bolts.

[0010] Preferably, the fluid interface is used to inject a detection medium, which is a colored gas; the cylinder has an observation window, and the observation port corresponds to the position of the tube sheet; the side wall of the push block has an arc surface, and the arc surface corresponds to the position of one end of the push plate.

[0011] Preferably, the observation window is made of polycarbonate sheet, and the edge of the observation window is sealed to the observation port by a fluororubber sealing ring.

[0012] Preferably, the fluid interface is provided with a one-way valve and a flow meter. The one-way valve is used to prevent the colored gas from leaking back, and the flow meter is used to control the injection rate of the colored gas.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The present invention relates to a pressure testing fixture for a dry evaporator tube bundle. This fixture ensures the sealing performance of the pressure test through multiple sealing structures and a closed space, preventing the test medium from leaking from the gap between the flange and the tube sheet. At the same time, the injection of colored gas, combined with a polycarbonate observation window, allows for direct observation of the leakage situation, greatly improving the accuracy of tube head sealing detection and reducing misjudgments.

[0015] 2. The dry evaporator tube bundle pressure testing fixture described in this utility model has an axial groove that not only provides a channel for fixing and sealing the tube sheet and the fixed flange, but also provides a central position for the tube bundle, avoiding the need for manual adjustment of the position of tube bundles of different specifications later, and preventing the flange from blocking the welding points of the tube sheet and heat exchange tubes. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a top sectional view of the present invention;

[0019] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a front sectional view of the present invention;

[0021] Figure 5 yes Figure 4 Enlarged view at point B in the middle;

[0022] Figure 6 This is a partial front sectional view of the structure of this utility model.

[0023] In the diagram: 1. Shell; 11. Fluid interface; 12. Fixed flange; 13. Tube sheet; 14. Heat exchange tube; 2. Axial groove; 21. Arc groove; 22. Sliding guide shaft; 23. Through groove; 24. Annular groove; 25. Sliding ring; 26. Rubber pad; 3. Push block; 31. Push plate; 32. Inclined surface; 33. Positioning bolt. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] Example 1

[0026] like Figures 1 to 6As shown in the embodiment of this utility model, a dry evaporator tube bundle pressure testing fixture includes a cylinder 1; a fluid interface 11 is provided at the top of the cylinder 1; both ends of the cylinder 1 are bolted to fixed flanges 12; a pair of tube sheets 13 are provided inside the cylinder 1; a set of heat exchange tubes 14 is provided between the pair of tube sheets 13, and one end of the set of heat exchange tubes 14 is fixedly connected to the tube sheet 13, and the other end passes through the tube sheet 13; sealing gaskets are fixedly connected to the opposite ends of the pair of fixed flanges 12, and both of the pair of tube sheets 13 are in contact with the sealing gaskets. The cylinder 1 is equipped with a sealing fastener, and both tube sheets 13 are sealed and fixed by the sealing fastener and the fixed flange 12. A base is fixedly connected to the bottom of the cylinder 1. During operation, the tooling core consists of the cylinder 1, the fixed flange 12, the tube sheet 13, the heat exchange tube 14, etc. The fixed flanges 12 at both ends of the cylinder 1 contact the tube sheet 13 through the sealing gasket. The sealing fastener seals and fixes the tube sheet 13 to the fixed flange 12. The medium is injected through the top fluid interface 11 to test the sealing performance of the connection between the heat exchange tube 14 and the tube sheet 13.

[0027] The sealing fastener includes an axial groove 2 and a pushing unit. One end of the cylinder 1 has a set of axial grooves 2. Both the end of the set of axial grooves 2 and the proximal end of the through-tube sheet 13 have arc-shaped grooves 21. A set of sliding guide shafts 22 are fixedly connected to the outer circular walls of both tube sheets 13, and the sliding guide shafts 22 are slidably connected within the arc-shaped grooves 21. One end of the sidewall of each set of arc-shaped grooves 21 has a through-groove 23. An annular groove 24 is formed between the fixed flange 12 and the interior of the cylinder 1, and the annular groove 24 and the through-groove 23 are connected. A sliding ring 25 is fixedly connected to the end of the annular groove 24 via a set of springs. A through groove is formed at the end of the fixed flange 12, and a sliding ring 25 is fixedly connected to the end of the sliding ring 25. Rubber gasket 26, and the position of rubber gasket 26 corresponds to that of the through groove; during operation, first fix the fixed flange 12 at one end with bolts, then push the tube sheet 13 and heat exchange tube 14 to the other end of the cylinder 1 so that the tube sheet 13 and the sealing gasket come into contact, then fix the fixed flange 12 at the other end, and then rotate the tube sheet 13 along with the heat exchange tube 14 so that the sliding guide shaft 22 enters the arc groove 21 and squeezes the push block 3. A pair of push blocks 3 slide and squeeze the push plate 31 in opposite directions, and then the rubber gasket 26 squeezes one end of the tube sheet 13 through the push unit, thereby increasing its sealing performance. Then fix the tube sheet 13 and the fixed flange 12 with positioning bolts 33 to complete the work test preparation.

[0028] The pushing unit includes a pushing block 3, which is slidably connected in the through groove 23. A pushing plate 31 is rotatably connected between the inner walls of the annular groove 24 via a rotating shaft. One end of the pushing plate 31 corresponds to the position of the pushing block 3, and the other end corresponds to the position of one end of the sliding ring 25. The side wall of the pushing block 3 has an inclined surface 32, which is inclined towards the sliding guide shaft 22. The fixed flange 12 and the tube sheet 13 are fixed together by positioning bolts 33. During operation, the spring at the end of the sliding ring 25 keeps the sliding ring 25 pulled. When the sliding guide shaft 22 squeezes the pushing block 3, the pushing block 3 simultaneously squeezes one end of the pushing plate 31, causing the pushing plate 31 to rotate around its rotating shaft. This causes the other end of the pushing plate 31 to push the sliding ring 25, thereby making the rubber pad 26 more tightly contact the tube sheet 13. Then, the fixed flange 12 and the tube sheet 13 are fixed together by positioning bolts 33, providing double assurance for the reliability of the sealing and fixing.

[0029] Furthermore, by setting the cylinder 1 and the base to be rotatably connected, the cylinder 1 can be rotated by fixing the heat exchange tube 14 and the tube sheet 13, so that the sliding guide shaft 22 can slide to the other end of the arc groove 21, allowing it to slide and press one end of the push plate 31 through the push block 3. In operation, this method can address the issue that in actual operation, because the heat exchange tube 14 and the tube sheet 13 are located inside the cylinder 1, the operable area is small and it is inconvenient to exert force. Therefore, by fixing the tube sheet 13 and the heat exchange tube 14 and rotating the cylinder 1, the above-mentioned operational purpose can be achieved.

[0030] Example 2

[0031] like Figures 1 to 6 As shown, the fluid interface 11 is used to inject a detection medium, which is a colored gas. An observation window is provided on the cylinder 1, and the observation port corresponds to the position of the tube sheet 13. The side wall of the push block 3 has an arc surface, and the arc surface corresponds to one end of the push plate 31. During operation, the colored gas is injected into the fluid interface 11, and the tube sheet 13 is observed through the observation window of the cylinder 1 to determine whether there is any leakage of colored gas and to judge the sealing condition. The arc surface of the push block 3 cooperates with the push plate 31 to improve the pushing stability.

[0032] The observation window is made of polycarbonate sheet, and the edge of the observation window is sealed to the observation port by a fluororubber sealing ring. During operation, the observation window uses a polycarbonate sheet, and the edge is sealed by a fluororubber sealing ring, which ensures both clear observation and the ability to withstand detection pressure, preventing the medium from leaking from the observation window and affecting the detection.

[0033] The fluid interface 11 is equipped with a one-way valve and a flow meter. The one-way valve is used to prevent the colored gas from leaking back, and the flow meter is used to control the injection rate of the colored gas. During operation, the one-way valve of the fluid interface 11 prevents the colored gas from leaking back, and the flow meter controls the injection rate to ensure stable detection pressure and avoid inaccurate detection results due to gas flow rate or back leakage.

[0034] Working principle: During operation, the heat exchange tube 14 and tube sheet 13 assembly is first placed into the cylinder 1. The flanges 12 at both ends of the cylinder 1 are connected by bolts, so that the sealing gaskets on the flanges initially contact the tube sheet 13. The cylinder 1 (or tube sheet 13) is rotated, allowing the sliding guide shaft 22 of the tube sheet 13 to slide into the arc groove 21 and press the push block 3. The push block 3 presses the push plate 31 through the inclined surface 32, causing the push plate 31 to drive the sliding ring 25 to compress the spring, so that the rubber gasket 26 on the sliding ring 25 tightly fits the tube sheet 13. Then, the tube sheet 13 and the flange are fixed with positioning bolts 33, forming a triple seal. Subsequently, colored gas (one-way valve to prevent backflow, flow meter to control rate) is injected through the fluid interface 11 at the top of the cylinder 1. The tube sheet 13 is observed for gas leakage through the polycarbonate observation window to determine the sealing performance of the connection between the heat exchange tube 14 and the tube sheet 13.

[0035] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pressure testing fixture for a dry evaporator tube bundle, characterized in that: The device includes a cylindrical body (1); a fluid interface (11) is provided at the top of the cylindrical body (1); both ends of the cylindrical body (1) are connected to fixed flanges (12) by bolts; a pair of tube sheets (13) are provided inside the cylindrical body (1); a set of heat exchange tubes (14) is provided between the pair of tube sheets (13), and one end of the set of heat exchange tubes (14) is fixedly connected to the tube sheet (13), and the other end passes through the tube sheet (13); a sealing gasket is fixedly connected to the opposite ends of the pair of fixed flanges (12), and the pair of tube sheets (13) are in contact with the sealing gasket; a sealing fastener is provided inside the cylindrical body (1), and the pair of tube sheets (13) are sealed and fixed by the sealing fastener and the fixed flanges (12); a base is fixedly connected to the bottom of the cylindrical body (1).

2. The dry evaporator tube bundle pressure testing fixture according to claim 1, characterized in that: The sealing fastener includes an axial groove (2) and a pushing unit. One end of the cylinder (1) is provided with a set of axial grooves (2). The end of the set of axial grooves (2) and the near end of the through tube plate (13) are both provided with arc grooves (21). A set of sliding guide shafts (22) are fixedly connected to the outer circular wall of a pair of tube plates (13), and the sliding guide shafts (22) are slidably connected in the arc grooves (21). One end of the side wall of the set of arc grooves (21) is provided with a through groove (23). An annular groove (24) is provided between the fixed flange (12) and the inside of the cylinder (1), and the annular groove (24) and the through groove (23) are connected. A sliding ring (25) is fixedly connected to the end of the annular groove (24) by a set of springs. A through groove is provided at the end of the fixed flange (12). A rubber pad (26) is fixedly connected to the end of the sliding ring (25), and the rubber pad (26) and the through groove are corresponding in position.

3. The dry evaporator tube bundle pressure testing fixture according to claim 2, characterized in that: The pushing unit includes a pushing block (3), which is slidably connected in the through groove (23). A pushing plate (31) is rotatably connected between the inner walls of the annular groove (24) via a rotating shaft. One end of the pushing plate (31) corresponds to the position of the pushing block (3), and the other end corresponds to the position of one end of the sliding ring (25). The side wall of the pushing block (3) is provided with an inclined surface (32), which is inclined towards the sliding guide shaft (22). The fixed flange (12) and the tube sheet (13) are fixed together by positioning bolts (33).

4. The dry evaporator tube bundle pressure testing fixture according to claim 3, characterized in that: The fluid interface (11) is used to inject the detection medium, which is a colored gas. The cylinder (1) has an observation window, and the observation port and the tube plate (13) are positioned opposite each other. The side wall of the push block (3) has an arc surface, and the arc surface and one end of the push plate (31) are positioned opposite each other.

5. The dry evaporator tube bundle pressure testing fixture according to claim 4, characterized in that: The observation window is made of polycarbonate sheet, and the edge of the observation window is sealed to the observation port by a fluororubber sealing ring.

6. The dry evaporator tube bundle pressure testing fixture according to claim 5, characterized in that: The fluid interface (11) is equipped with a one-way valve and a flow meter. The one-way valve is used to prevent the colored gas from leaking back, and the flow meter is used to control the injection rate of the colored gas.

Images