A device and method for detecting leakage of a capillary heat exchanger core

Abstract

The present application relates to heat exchanger core leakage detection technical field, specifically for a kind of capillary tube heat exchanger core leakage detection device and method, including heat exchange core, bolt I, nut I, detection fixed pressing plate, detection end cover and gasket, the both ends of the heat exchange core are equipped with one detection end cover respectively, the inner end of the detection end cover is equipped with gasket, the upper and lower ends of the detection end cover are equipped with one detection fixed pressing plate respectively, the gasket is located in detection fixed pressing plate, the left and right ends of the detection fixed pressing plate are symmetrically equipped with one support plate, the corresponding two support plates of the left and right ends of the detection fixed pressing plate are respectively installed with one bolt I, the detection method of the present application is adopted by tightening clamp, by the leakage detection device arranged at the both ends of heat exchange core is sealed again leakage detection, can avoid the overall rejection of heat exchanger caused by the poor welding of heat exchanger core, avoid material waste, save material cost and time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchanger core leakage detection, in particular to a device and method for detecting leakage of a capillary tube heat exchanger core. BACKGROUND

[0002] The capillary tube heat exchanger is mostly cylindrical in shape, and two fluids for heat exchange flow in the tube and outside the tube, respectively. The structure is a small-sized tube-shell heat exchanger using capillary tubes, which is composed of a heat exchange core, an outer shell, and a cold side inlet assembly and a hot side inlet assembly. The heat exchange core is composed of capillary heat exchange tubes, a tube plate, and a baffle. Compared with the traditional tube-shell heat exchanger, the capillary tube heat exchanger has the characteristics of small tube diameter, small volume, light weight, and high heat exchange efficiency. With the development of aerospace technology, more and more heat exchangers are applied to the field of aerospace, but the quality of heat exchangers in special fields such as aviation and aerospace is extremely strict.

[0003] The compact structure, small volume, and high heat exchange efficiency of the capillary tube high-efficiency heat exchanger determine that the outer diameter and wall thickness of the heat exchange tube in the heat exchange core of the capillary tube high-efficiency heat exchanger are strictly required, and the diameter of the tube plate is limited. In order to achieve high-efficiency heat exchange, the arrangement of the heat exchange tube needs to be particularly compact, which results in that the distance between the edge heat exchange tube and the edge of the tube plate is limited. Moreover, the capillary tube high-efficiency heat exchanger is mostly circular in shape, and the shape of the heat exchange tube plate can be circular or square, which is cut into a circular shape after brazing. The type of brazing material can be paste or sheet, but selecting a circular tube plate and a round sheet brazing material is more advantageous for saving subsequent processing time and cost.

[0004] Under the above background, it is necessary to detect the leakage of the heat exchange core of the capillary tube high-efficiency heat exchanger. However, when the existing equipment detects the leakage of the heat exchange core, the whole heat exchanger may be scrapped due to poor welding of the heat exchange core, resulting in waste of materials and time. SUMMARY

[0005] To solve the above problems, the present application provides a device and method for detecting leakage of a capillary tube heat exchanger core. The present application adopts a detection method of a tight clamp type clamp plate, and detects the leakage by sealing the leakage detection device arranged at both ends of the heat exchange core, which can avoid the whole heat exchanger being scrapped due to poor welding of the heat exchanger core, avoid material waste, and save material cost and time.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows:

[0007] A kind of for capillary heat exchanger core leakage detection device, including heat exchange core, bolt I, nut I, detection fixed pressing plate, detection end cover and gasket, the both ends of the heat exchange core are equipped with one detection end cover respectively, the inner end of the detection end cover is equipped with gasket, the upper and lower ends of the detection end cover are equipped with one detection fixed pressing plate respectively, two detection fixed pressing plates are fixedly connected, the gasket is located in detection fixed pressing plate, the left and right ends of the detection fixed pressing plate are symmetrically equipped with one support plate, the left and right ends of the detection fixed pressing plate corresponding two support plates are respectively equipped with one bolt I, the bolt I is threadedly connected with nut I, the detection end cover is equipped with vent hole.

[0008] Further, it further includes detection compression ring, the detection compression ring is arranged on the tube sheet of heat exchange core, and the detection compression ring is located in detection fixed pressing plate.

[0009] Further, the detection compression ring of one end of heat exchange core is equipped with two, two detection compression rings are respectively corresponding with the position of two detection fixed pressing plates, and the outer end faces of two detection compression rings are all attached to the inner end face of the tube sheet of heat exchange core.

[0010] Further, the both ends of the detection fixed pressing plate are fixedly connected with one support lug respectively, the two support lugs of one end of two detection fixed pressing plates of the same side are installed with bolt II, and the bolt II is threadedly connected with nut II.

[0011] Further, the vent hole is equipped with detection connector.

[0012] The application also provides a detection method for the capillary heat exchanger core leakage detection device, which comprises the following steps:

[0013] Step 1: the tube sheet, baffle and heat exchange tube are brazed according to the drawing requirement, and the heat exchange core to be detected is welded;

[0014] Step 2: the detection end cover, detection compression ring and detection fixed pressing plate are processed according to the drawing;

[0015] Step 3: place the detection end cover on the platform, place the gasket, press the two detection compression rings tightly to the tube sheet, then install the two detection fixed plates, then install the bolt I and nut I, and finally tighten the bolt I and nut I, so that the gasket between the detection compression ring and the detection end cover is pressed tightly;

[0016] Step 4: repeat step 3 to install the other side of the heat exchange core;

[0017] Step 5: install the detection connector connected with the gas tightness test, liquid pressure test and helium mass spectrum test equipment, carry out gas tightness test, liquid pressure test and helium mass spectrum test according to the parameters and requirements of heat exchanger, and verify whether the heat exchange core leaks.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The present application provides a high-quality and high-efficiency leakage detection method. The detection method using the clamping type clamp is arranged with a detection end cover at both ends of the heat exchange core, a gasket is placed in the detection end cover, the gasket is pressed tightly by a detection pressure ring, a detection fixed pressure plate is placed, then a bolt I and a nut I are installed and tightened, the pre-tightening force between the bolt I and the nut I is used to apply pressure to the detection fixed pressure plate by the support plate, the detection fixed pressure plate is deformed, the gasket between the detection pressure ring and the detection end cover is pressed tightly through the deformation of the detection fixed pressure plate, and the sealing effect is achieved. Then, according to the parameters and requirements of the heat exchanger, air tightness test, liquid pressure test and helium mass spectrum test are carried out to verify whether the core leaks, avoid the whole heat exchanger from being scrapped due to poor welding of the heat exchanger core, avoid material waste, and save material cost and time. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the capillary heat exchanger core leakage detection device.

[0021] Figure 2 It is a schematic diagram of the installation of the gasket.

[0022] Figure 3 It is a schematic diagram of the installation of the detection pressure ring.

[0023] Figure 4 It is a schematic diagram of the installation of the detection fixed pressure plate.

[0024] Figure 5 It is a schematic diagram of the embodiment of pressing the gasket.

[0025] Figure 6 It is a schematic diagram of the detection end cover.

[0026] Figure 7 It is a schematic diagram of the gasket.

[0027] Figure 8 It is a schematic diagram of the detection pressure ring.

[0028] Figure 9 It is a schematic diagram of the detection fixed pressure plate.

[0029] In the figure: heat exchange core 1; bolt I; nut I 3; detection fixed pressure plate 4; detection end cover 5; gasket 6; detection pressure ring 7; bolt II 8; nut II 9; support plate 10; support lug 11. EMBODIMENT

[0030] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0031] As Figures 1-9As shown, a detection end cover 5 is installed at one end of the heat exchange core 1, then a gasket 6 is installed at the inner end of the detection end cover 5, then two detection fixed pressing plates 4 are installed on the detection end cover 5 and the gasket 6, so that the gasket 6 and the detection end cover 5 are located in the detection fixed pressing plates 4, a support plate 10 is symmetrically arranged at the left and right ends of the detection fixed pressing plate 4, a bolt I 2 is arranged at the corresponding two support plates 10 at the left and right ends of the detection fixed pressing plate 4, and a nut I 3 is threadedly connected to the bolt I 2, then the above installation steps are repeated at the other end of the heat exchange core 1, and then the bolt I and the nut I 3 are tightened, so that the support plates 10 at the left and right ends of the detection fixed pressing plate 4 are inwardly extruded, the detection fixed pressing plate 4 is deformed, the gasket 6 is pressed tightly through the deformation of the detection fixed pressing plate 4, and the sealing effect can be achieved, then the air tightness test, the liquid pressure test and the helium mass spectrum test are carried out according to the parameters and requirements of the heat exchanger, the purpose of verifying whether the core leaks is achieved, the overall heat exchanger is avoided from being scrapped due to poor welding of the heat exchanger core, material waste is avoided, and material cost and time are saved.

[0032] Further, one lug 11 is fixedly connected to each end of the detection fixed pressing plate 4, two bolts II 8 are arranged on the two lugs 11 at one end of the two detection fixed pressing plates 4 on the same side, and a nut II 9 is threadedly connected to the bolt II 8, after the two detection fixed pressing plates 4 are installed at one end of the heat exchange core 1, the bolt II 8 and the nut II 9 are tightened to fix the two detection fixed pressing plates 4, the two detection fixed pressing plates 4 can also be separated through the bolt II 8 and the nut II 9, and then the detection device is convenient to disassemble and assemble.

[0033] Further, two gaskets 6 are arranged at one end of the heat exchange core 1, since the heat exchange core 1 is in a cylindrical shape, and the two ends of the heat exchange core 1 are also circular tube plates, in order to facilitate the installation of the gaskets 6 on the detection cover plate 5, the gaskets 6 are arranged in a semicircular shape, and then the two gaskets 6 are conveniently installed on the detection cover plate 5.

[0034] Further, the detection device further comprises detection compression rings 7, the detection compression rings 7 are arranged on the inner side of the gasket 6, two detection compression rings 7 are arranged at each end of the heat exchange core 1, the two detection compression rings 7 at one end correspond to the positions of the two gaskets 6, and the detection compression rings 7 are located in the detection fixed pressing plate 4, when the gasket 6 is pressed tightly through the bolt I and the nut I 3, the detection compression rings 7 are also extruded, the detection compression rings 7 further press the gasket 6, and the sealing effect is enhanced.

[0035] The embodiment is a detection method of a capillary heat exchanger core leakage detection device, which comprises the following steps:

[0036] Step 1: The tube plate, the baffle plate and the heat exchange pipe are brazed according to the drawing requirements to form a heat exchange core 1 to be detected.

[0037] Step 2: the detection end cover 5, detection compression ring 7 and detection fixed plate 4 according to the drawing processing;

[0038] Step 3: the detection end cover 5 is placed on the platform, the gasket 6 is placed, the two detection compression rings 7 are pressed tightly, then the two detection fixed plates 4 are installed, the bolt I 2 and the nut I 3 are installed, finally the bolt I 2 and the nut I 3 are tightened, so that the gasket 6 between the detection compression ring 7 and the detection end cover 5 is pressed tightly;

[0039] Step 4: repeat step 3, install the other side of the heat exchange core 1;

[0040] Step 5: install the detection joint connected with the air tightness test, liquid pressure test and helium mass spectrum test equipment, according to the parameters and requirements of the heat exchanger, carry out the air tightness test, liquid pressure test and helium mass spectrum test, verify whether the heat exchange core 1 leaks.

[0041] The above describes a kind of for capillary tube heat exchanger core leak detection device and method provided by the present application, detailed introduction has been carried out in this paper, the principle and implementation mode of the present application are described by specific example, the above example is only for helping to understand the method of the present application and its core idea;Meanwhile, for the general technical personnel in the art, according to the idea of the present application, in specific implementation mode and application range will have the change of place, as described above, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A device for detecting leakage in the core of a capillary heat exchanger, characterized in that: The utility model provides a heat exchange core detection device, including heat exchange core (1), bolt I (2), nut I (3), detect fixed pressing plate (4), detection end cover (5) and gasket (6), the both ends of heat exchange core (1) are equipped with a detection end cover (5) respectively, the inner end of detection end cover (5) is equipped with gasket (6), the upper and lower ends of detection end cover (5) are equipped with a detection fixed pressing plate (4) respectively, two detection fixed pressing plates (4) are fixedly connected, gasket (6) is located in detection fixed pressing plate (4), the left and right ends of detection fixed pressing plate (4) are symmetrically equipped with a support plate (10), the left and right ends of detection fixed pressing plate (4) corresponding two support plates (10) are installed with a bolt I (2) respectively, the bolt I (2) is threadedly connected with nut I (3), detection end cover (5) is equipped with vent hole.

2. A device for detecting leakage in a capillary heat exchanger core according to claim 1, characterized in that: It also includes a detection compression ring (7), which is arranged on the tube sheet of the heat exchange core (1), and the detection compression ring (7) is located in the detection fixed pressing plate (4).

3. A device for detecting leaks in a capillary heat exchanger core according to claim 2, characterized in that: The detection compression ring (7) is provided at one end of the heat exchange core (1), and the two detection compression rings (7) correspond to the positions of the two detection fixed pressing plates (4), respectively. The outer end faces of the two detection compression rings (7) are in close contact with the inner end faces of the tube sheet of the heat exchange core (1).

4. A device for detecting leaks in a capillary heat exchanger core according to claim 1, characterized in that: The two ends of the detection fixed pressing plate (4) are fixedly connected with a lug (11), respectively. The two lugs (11) at one end of the two detection fixed pressing plates (4) on the same side are installed with a bolt II (8), and the bolt II (8) is threadedly connected with a nut II (9).

5. A device for detecting leaks in a capillary heat exchanger core according to claim 1, characterized in that: A detection connector is provided on the vent hole.

6. The detection method for the capillary heat exchanger core leakage detection device according to claim 1, characterized in that: It includes the following steps: Step 1: The tube sheet, baffle and heat exchange tube are brazed according to the drawing requirements to form the heat exchange core (1) to be detected. Step 2: The detection end cover (5), detection compression ring (7) and detection fixed pressing plate (4) are processed according to the drawing. Step 3: Place the detection end cover (5) on the platform, place the gasket (6), press the two detection compression rings (7) tightly against the tube sheet, then install the two detection fixed pressing plates (4), then install the bolt I (2) and the nut I (3), and finally tighten the bolt I (2) and the nut I (3) to press the gasket (6) between the detection compression ring (7) and the detection end cover (5) tightly. Step 4: Repeat step 3 to install the other side of the heat exchange core (1). Step 5: Install the detection connector connected with the air tightness test, liquid pressure test and helium mass spectrum test equipment, and perform the air tightness test, liquid pressure test and helium mass spectrum test according to the parameters and requirements of the heat exchanger to verify whether the heat exchange core (1) leaks.

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