Detection tool and detection system for air tightness of radiator core body

Abstract

The utility model discloses a tool and a system for detecting the air tightness of a radiator core, and the tool comprises an air guide block which is connected with an inflation device, is inserted into a water inlet pipe head of the radiator core in a sealing manner, and is used for guiding air into the radiator core; the plugging block is hermetically inserted on the water outlet pipe head of the radiator core body and is used for plugging the water outlet pipe head; the clamps are respectively arranged on the air guide block and the plugging block and are used for clamping and fixing the air guide block and the water inlet pipe head as well as the plugging block and the water outlet pipe head; and the two sealing parts are respectively arranged in the water inlet pipe head and the water outlet pipe head and are used for radially sealing the joints between the air guide block and the water inlet pipe head and between the plugging block and the water outlet pipe head. According to the technical scheme, on the basis of ensuring the accuracy of the detection result, the technical effects of reducing the misjudgment rate, enabling operators to quickly detect and improving the production efficiency are achieved, and the purposes of ensuring high-quality production of enterprise products and finally improving the economic benefits of enterprises are achieved.

Description

Technical Field

[0001] This utility model application belongs to the field of automotive radiator heater core air tightness testing technology, specifically relating to a testing fixture and testing system for the air tightness of radiator cores. Background Technology

[0002] In the automotive industry, the heating system of a car's air conditioning system is inseparable from the radiator. As the main component of the radiator, the sealing of the radiator core has a crucial impact on the performance of the radiator, the overall quality of the car, and the safety of the occupants. Therefore, the testing of the core's sealing is one of the most important steps in the manufacturing process of the car's heating system. Specifically, production personnel must perform helium testing on the radiator core to check for leaks.

[0003] Currently, common radiator assembly methods include using unions (detachable connections) between the radiator and its inlet and outlet pipes. After the inlet and outlet pipes are fixedly installed on the radiator core, the operator begins helium testing: using an inflation device, gas is introduced into the radiator core through the inlet pipe to test the helium concentration. Therefore, to ensure the accuracy of the test results, it is crucial to ensure a proper seal between the inlet and outlet pipes during the inflation process.

[0004] Existing sealing methods typically use annular sealing rings to seal the outer end face of the water pipe head via axial sealing. This method faces the following technical problems: Unevenness between the outer end faces of the inlet and outlet water pipe heads can lead to insufficient sealing, increasing the risk of helium leakage during helium testing. This results in high helium test values, causing misjudgments and requiring unnecessary re-inspection or rework of a large number of qualified products, significantly reducing production efficiency. Furthermore, this testing method demands high precision from the manufactured products, including the flatness of the outer end face of the water pipe head, the diagonal of the core, and the degree of core twist. Even slight errors in any of these dimensional parameters can lead to misjudgments, indirectly increasing production costs.

[0005] Therefore, there is an urgent need to design a new core sealing performance testing device to solve the above-mentioned technical problems, so as to reduce the false judgment rate, enable operators to conduct rapid testing, and improve production efficiency while ensuring the accuracy of the test results, ultimately achieving the goal of ensuring high-quality production of enterprise products and improving the economic benefits of enterprises. Utility Model Content

[0006] This utility model application discloses a testing fixture and system for the airtightness of a radiator core, in order to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the first aspect of this utility model provides a testing fixture for the airtightness of a radiator core, comprising: an air guide block for connecting to an air filling device and sealingly inserted into the water inlet pipe of the radiator core to introduce gas into the radiator core; a sealing block for sealingly inserting into the water outlet pipe of the radiator core to seal the water outlet pipe; clamps respectively disposed on the air guide block and the sealing block for clamping and fixing the air guide block to the water inlet pipe and the sealing block to the water outlet pipe; and two sealing parts respectively disposed inside the water inlet pipe and the water outlet pipe to radially seal the connection between the air guide block and the water inlet pipe, and between the sealing block and the water outlet pipe.

[0008] Furthermore, the lower end face of the air guide block is provided with a first annular protrusion that matches the first stepped hole of the water inlet pipe head. The lower end face of the first annular protrusion is coaxially provided with a second annular protrusion, which is used to insert into the water inlet. Both the first and second annular protrusions are provided with through-flow channels that are connected to the internal flow channels of the air guide block. The sealing part is provided on the second stepped hole of the water inlet pipe head and abuts against the hole wall of the second stepped hole and the side of the second annular protrusion, respectively, to radially seal the gap between them.

[0009] Furthermore, the lower end face of the sealing block is provided with a third circular protrusion that matches the third stepped hole of the water outlet head, and a fourth circular protrusion is coaxially provided on the lower end face of the third circular protrusion. The fourth circular protrusion is used to plug into the water outlet. The sealing part is used to be installed on the fourth stepped hole of the water outlet head, and abuts against the hole wall of the fourth stepped hole and the side of the fourth circular protrusion respectively, radially sealing the gap between the two.

[0010] Furthermore, the sealing part is an elastic sealing ring, which is respectively fitted onto the second annular protrusion and the fourth circular protrusion.

[0011] Furthermore, the diameter of the elastic sealing ring is larger than the outer diameter of the second annular protrusion and the diameter of the fourth circular protrusion.

[0012] Furthermore, the bottom plate and the top plate are fixedly connected by the side plate; the bottom plate and the top plate are used to place the water inlet pipe head and the air guide block, the water outlet pipe head and the sealing block, and the bottom plate has an opening for accommodating the water inlet pipe head or the water outlet pipe head.

[0013] Furthermore, the air guide block is equipped with an inflation connector for connecting to an inflation device.

[0014] Furthermore, the inflation connector and the air guide block are connected by threads. The upper end face of the air guide block has a threaded hole for installing the inflation connector, and the threaded hole is connected to the internal flow channel of the air guide block. The top plate of the clamp has a top plate opening for accommodating the inflation connector.

[0015] Furthermore, both the air guide block and the sealing block are made of brass.

[0016] A second aspect of this disclosure provides a system for testing the airtightness of a radiator core, including an air source device and the testing fixture provided above.

[0017] The advantages and positive effects of this utility model are:

[0018] 1. This utility model application discloses a testing fixture for the airtightness of a radiator core. Based on the structural characteristics of the inlet and outlet pipes of the radiator core extending outward to form stepped holes, annular and circular protrusions are designed at the bottom of the air guide block and the sealing block, respectively matching the inlet and outlet pipes. In use, the annular and circular protrusions are inserted into the inlet of the inlet pipe and the outlet of the outlet pipe, respectively, and then clamped and fixed. A sealing part is provided between the stepped hole and the annular protrusion, and between the stepped hole and the circular protrusion, to radially seal the gaps between the air guide block and the inlet pipe, and between the sealing block and the outlet pipe, i.e., between the protrusions and the stepped hole.

[0019] Compared to the traditional method of sealing the outer end face of the water pipe head with a sealing ring axially, this radial sealing method avoids insufficient sealing caused by uneven outer end faces of the inlet and outlet water pipe heads. This prevents helium leakage during helium testing, which can lead to high helium test values, misjudgments by relevant personnel, and unnecessary re-inspection or rework of a large number of qualified products, ultimately resulting in low production efficiency.

[0020] This technical solution, while ensuring the accuracy of the test results, achieves the technical effects of reducing the misjudgment rate, enabling operators to conduct tests quickly, and improving production efficiency. It aims to ensure high-quality production of enterprise products and ultimately improve the economic benefits of the enterprise. Moreover, the testing fixture has a simple structure, is easy to operate, and has strong sealing performance.

[0021] 2. The testing fixture disclosed in this utility model application has a sealing part between the second stepped hole and the second annular protrusion. By using the clamping force of the clamp on the air guide block and the water inlet head, the sealing part can abut against the hole wall of the second stepped hole and the side of the second annular protrusion respectively, thereby achieving radial sealing of the gap between the air guide block and the water inlet. In addition, the first annular protrusion is located in the first stepped hole and fills the first stepped hole, which can also play a role in radial sealing to a certain extent, that is, the role of double radial sealing.

[0022] 3. The testing fixture disclosed in this utility model application has a sealing part between the fourth step hole and the fourth circular protrusion. At this time, by using the clamping force of the clamp on the sealing block and the water outlet head, the sealing part can abut against the hole wall of the fourth step hole and the side of the fourth circular protrusion respectively, thereby achieving radial sealing of the gap between the sealing block and the water outlet. Similarly, the third circular protrusion is located in the third step hole and fills the third step hole, which can also play a role in radial sealing to a certain extent.

[0023] 4. The testing fixture disclosed in this utility model application has an elastic sealing ring as its sealing part. During installation and use, it can be pressed to deform the elastic sealing ring, thereby fully filling the sealed part or space and making the sealing effect better.

[0024] 5. The testing fixture disclosed in this utility model application has an elastic sealing ring with a diameter larger than the outer diameter of the second annular protrusion and the diameter of the fourth circular protrusion. This design allows the elastic sealing ring to fit tightly against the protrusion, resulting in a tighter seal between the protrusion and the stepped hole, and a better effect.

[0025] 6. The testing fixture disclosed in this utility model application has an air inlet on the air guide block and uses a threaded connection. This design makes it easy to disassemble and carry.

[0026] 7. The testing fixture disclosed in this utility model application has a guide block and a sealing block made of brass. Brass has high rigidity, certain corrosion resistance, which can extend the service life of the device, and has a high surface finish.

[0027] 8. The detection system disclosed in this utility model application includes the above-mentioned detection fixture, and therefore possesses all the beneficial effects of the above-mentioned detection fixture, which will not be repeated here.

[0028] 9. The technical solution disclosed in this utility model application has the advantages of simple structure, detachability, firm connection, strong sealing, stable performance, easy installation and use, easy manufacturing, safety and reliability, durability, high smoothness, and easy portability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the connection structure of the air guide block, clamp, and water inlet pipe head in a testing fixture for the air tightness of a radiator core provided in the first aspect of this utility model.

[0030] Figure 2 yes Figure 1 Partial sectional view;

[0031] Figure 3 This is a schematic diagram of the installation of the air guide block, air inlet connector, and water inlet pipe in this testing fixture;

[0032] Figure 4This is a schematic diagram of the installation of the air guide block and the sealing part in this testing fixture;

[0033] Figure 5 This is a 3D view of the fixture in this testing tooling;

[0034] Figure 6 This is a schematic diagram of the connection structure of the sealing block, clamp, and water outlet pipe head in this testing fixture;

[0035] Figure 7 yes Figure 6 Partial sectional view;

[0036] Figure 8 This is a schematic diagram of the installation of the sealing block and the water outlet pipe head in this testing fixture;

[0037] Figure 9 This is a schematic diagram of the installation of the plugging block and the sealing part in this testing fixture;

[0038] Figure 10 This is a schematic diagram of the overall installation of this testing fixture and the radiator core.

[0039] Explanation of reference numerals in the attached figures

[0040] 1. Inflation connector; 101. External thread structure; 102. Inflation channel; 2. Clamp; 201. Top plate; 201a. Top plate opening; 202. Bottom plate; 202a. Bottom plate opening; 203. Side plate; 3. Air guide block; 301. First annular protrusion; 302. Second annular protrusion; 303. Flow channel; 304. Threaded hole; 4. Sealing part; 5. Water inlet pipe head; 501. First stepped hole; 502. Second stepped hole; 503. Water inlet; 6. Sealing block; 601. Third circular protrusion; 602. Fourth circular protrusion; 7. Water outlet pipe head; 701. Third stepped hole; 702. Fourth stepped hole; 703. Water outlet; 8. Radiator core. Detailed Implementation

[0041] The specific embodiments of this utility model application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this disclosure.

[0042] In the technical solutions disclosed in this utility model application, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to those defined based on the drawing direction of the corresponding figures, while "inner" and "outer" refer to those inside and outside relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not have sequential or importance implications. Additionally, in the description with reference to the figures, the same reference numerals in different figures denote the same element.

[0043] [Overview]: In commonly used automotive radiator cores, the inlet and outlet water pipes are typically designed as follows: Figure 3 As shown, the water inlet pipe head 5, in addition to including the water inlet 503, also extends outward to form a second stepped hole 502 and a first stepped hole 501 in sequence; while the structure of the water outlet pipe 7 is completely similar to that of the water inlet pipe head 5, as shown in the figure. Figure 8 As shown, in addition to the outlet 703, the outlet 703 extends outward and expands to form the fourth step hole 702 and the third step hole 701 in sequence.

[0044] Therefore, based on the structural features of the aforementioned inlet pipe 5 and outlet pipe 7, the first aspect of this utility model application discloses a testing fixture for the airtightness of a radiator core, such as... Figure 1 , Figure 2 , Figure 6 , Figure 7 , Figure 10 As shown, it includes:

[0045] The air guide block 3 is used to connect to the air charging device and is sealed and inserted into the water inlet pipe head 5 of the radiator core 8 to introduce gas into the radiator core 8.

[0046] The sealing block 6 is inserted into the water outlet pipe head 7 of the radiator core 8 to seal the water outlet pipe head 7.

[0047] The clamps 2 are respectively set on the air guide block 3 and the sealing block 6, and are used to clamp and fix the air guide block 3 to the water inlet pipe head 5 and the sealing block 6 to the water outlet pipe head 7.

[0048] Two sealing parts 4 are respectively installed in the water inlet pipe head 5 and the water outlet pipe head 7 to radially seal the connection between the air guide block 3 and the water inlet pipe head 5, and between the sealing block 6 and the water outlet pipe head 7.

[0049] In the above technical solution, based on the structural characteristics of the water inlet pipe head 5 and water outlet pipe head 7 of the radiator core 8 extending outward to form stepped holes, structures matching the water inlet pipe head 5 and water outlet pipe head 7 are designed at the bottom of the air guide block 3 and the sealing block 6, respectively. When in use, they are inserted into the water inlet 503 of the water inlet pipe head 5 and the water outlet 703 of the water outlet pipe head 7, respectively, and then each is tightened and fixed with clamps 2. A sealing part 4 is provided at the connection between the air guide block 3 and the water inlet pipe head 5, and between the sealing block 6 and the water outlet pipe head 7, that is, the gap between the air guide block 3 and the water inlet 503 and between the sealing block 6 and the water outlet 703 is radially sealed.

[0050] This radial sealing method, compared to the traditional method of sealing the outer end face of the water pipe head axially with a sealing ring, avoids insufficient sealing due to unevenness of the outer end face of the water pipe head. This prevents helium leakage during helium testing, which can lead to high helium test values, misjudgments by relevant personnel, and unnecessary re-inspection or rework of a large number of qualified products, ultimately resulting in low production efficiency. This technical solution, while ensuring the accuracy of test results, achieves the technical effects of reducing the misjudgment rate, enabling operators to conduct tests quickly, and improving production efficiency. It aims to ensure high-quality production of enterprise products and ultimately improve the enterprise's economic benefits. Furthermore, the testing fixture has a simple structure, is easy to operate, and has strong sealing performance.

[0051] In this embodiment, such as Figure 1 , Figure 2 , Figure 3 As shown, the lower end face of the air guide block 3 is provided with a first annular protrusion 301, which matches the first stepped hole 501 of the water inlet pipe head 5. The lower end face of the first annular protrusion 301 is coaxially provided with a second annular protrusion 302. The second annular protrusion 302 is used to be inserted into the water inlet 503. Both the first annular protrusion 301 and the second annular protrusion 302 are provided with a through flow channel 303, which is connected to the internal flow channel of the air guide block 3.

[0052] The sealing part 4 is used to be installed on the second stepped hole 502 of the water inlet pipe head 5, and abuts against the hole wall of the second stepped hole 502 and the side of the second annular protrusion 302 respectively, and radially seals the gap between them.

[0053] In this design, after the air guide block 3 is inserted into the water inlet pipe head 5, the first annular protrusion 301 is located inside the first stepped hole 501. The clamp 2 is used to clamp the upper and lower end faces of the air guide block 3 and the water inlet pipe head 5, thereby fixing them together. A sealing part 4 is provided between the second stepped hole 502 and the second annular protrusion 302. At this time, using the clamping force of the clamp 2 on the air guide block 3 and the water inlet pipe head 5, the sealing part 4 can abut against the hole wall of the second stepped hole 502 and the side of the second annular protrusion 302, respectively, thereby achieving radial sealing of the gap between the air guide block 3 and the water inlet 503. In addition, the first annular protrusion 301 is located inside the first stepped hole 501, which can also play a sealing role to a certain extent.

[0054] Furthermore, in some implementations, such as Figure 6 , Figure 7 , Figure 8 As shown, the lower end face of the sealing block 6 is provided with a third circular protrusion 601 that matches the third stepped hole 701 of the water outlet head 7. The lower end face of the third circular protrusion 601 is coaxially provided with a fourth circular protrusion 602, which is used to plug into the water outlet 703.

[0055] The sealing part 4 is used to be installed on the fourth step hole 702 of the water outlet head 7, and abuts against the hole wall of the fourth step hole 702 and the side of the fourth circular protrusion 602 respectively, and radially seals the gap between the two.

[0056] This design is completely similar to the connection relationship of the air guide block 3, water inlet pipe head 5, and clamp 2 mentioned above. After the sealing block 6 is inserted into the water outlet pipe head 7, and the third circular protrusion 601 is located in the third stepped hole 701, the clamp 2 is used to clamp the upper and lower end faces of the sealing block 6 and the water outlet pipe head 7 to fix them. A sealing part 4 is set between the fourth stepped hole 702 and the fourth circular protrusion 602. At this time, using the clamping force of the clamp 2 on the sealing block 6 and the water outlet pipe head 7, the sealing part 4 can abut against the hole wall of the fourth stepped hole 702 and the side of the fourth circular protrusion 602 respectively, thereby achieving radial sealing of the gap between the sealing block 6 and the water outlet 703. Similarly, the third circular protrusion 601 is located in the third stepped hole 701 and can play a certain role in radial sealing. It is worth noting that the function of the sealing block 6 is only to seal the water outlet 703, so the sealing block 6 is a solid block.

[0057] Furthermore, in some specific implementations, such as Figure 4 , Figure 9 As shown, the sealing part 4 is an elastic sealing ring, which is respectively fitted onto the second annular protrusion 302 and the fourth circular protrusion 602. The sealing part 4 is an elastic sealing ring, which will be subjected to the clamping force from the clamp 2 during installation and use, causing the elastic sealing ring to deform, thereby fully filling the sealed part or space and making the sealing effect better.

[0058] In some specific embodiments, the diameter of the elastic sealing ring is larger than the outer diameter of the second annular protrusion 302 and the diameter of the fourth circular protrusion 602. This design allows the elastic sealing ring to fit tightly against the protrusion, resulting in a more tight seal and better effect.

[0059] In other implementations, such as Figure 5 As shown, the clamp 2 includes a base plate 202 and a top plate 201. The base plate 202 is fixedly connected to the top plate 201 via a side plate 203. A space between the base plate 202 and the top plate 201 is used to place the inlet pipe head 5 and the air guide block 3, and the outlet pipe head 7 and the sealing block 6. The base plate 202 has an opening 202a for accommodating the inlet pipe head 5 or the outlet pipe head 7. Further, as... Figure 1 As shown, the air guide block 3 is also equipped with an inflation connector 1 for connecting to an inflation device. Furthermore, as... Figure 2 , Figure 3As shown, the inflation connector 1 and the air guide block 3 are connected by threads. The upper end face of the air guide block 3 is provided with a threaded hole 304 for installing the inflation connector 1. The threaded hole 304 is connected to the internal flow channel of the air guide block 3. The bottom of the inflation connector 1 is provided with an external thread structure 101 that matches the threaded hole 304, and an inflation channel 102 that is connected to the internal flow channel of the air guide block 3.

[0060] The top plate 201 of the clamp 2 has a top plate opening 201a for accommodating the inflation connector 1. The air guide block 3 is provided with the inflation connector 1 and is connected by threads. This design makes the tooling easy to disassemble and carry.

[0061] In some other embodiments, both the air guide block 3 and the sealing block 6 are made of brass. The purpose is that brass has high rigidity, certain corrosion resistance, which can extend the service life of the device, and has a high surface finish.

[0062] Based on the above technical solutions, this disclosure also provides a system for testing the airtightness of a radiator core, including an air source device and the aforementioned testing fixture. Since the testing system provided in this disclosure has all the characteristics of the aforementioned testing fixture, it will not be described again here to avoid repetition.

[0063] This utility model application exemplarily describes the steps for using this testing fixture, as follows:

[0064] S1. Install the inflation connector 1 on the air guide block 3, and then put the two elastic sealing rings on the second annular protrusion 302 of the air guide block 3 and the fourth circular protrusion 602 of the sealing block 6 respectively.

[0065] S2. Insert the air guide block 3 and the sealing block 6 into the water inlet pipe head 5 and the water outlet pipe head 7 respectively. After completion, use the clamp 2 to clamp and fix them respectively. Finally, as shown in the figure... Figure 10 As shown;

[0066] S3. Connect the inflation connector 1 to the air source device;

[0067] S4. Introduce detection gas and obtain the value of helium leakage to determine the sealing performance of the radiator core 8.

[0068] S5. Disassemble this tooling and reuse it to inspect the next product.

[0069] The preferred embodiments of this utility model application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the disclosed technical concept, various simple modifications can be made to the technical solution of this utility model application, and these simple modifications all fall within the protection scope of this application.

[0070] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0071] Furthermore, various different embodiments of this utility model application can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this utility model application.

Claims

1. A fixture for testing the airtightness of a radiator core, characterized in that, include: An air guide block (3) is used to connect to an air filling device and is sealed and inserted into the water inlet pipe head (5) of the radiator core (8) to introduce gas into the radiator core (8). The sealing block (6) is inserted into the outlet pipe head (7) of the radiator core (8) for sealing the outlet pipe head (7). The clamps (2) are respectively set on the air guide block (3) and the sealing block (6) for clamping and fixing the air guide block (3) and the water inlet pipe head (5), and the sealing block (6) and the water outlet pipe head (7). Two sealing parts (4) are respectively installed in the water inlet pipe head (5) and the water outlet pipe head (7) to radially seal the connection between the air guide block (3) and the water inlet pipe head (5), and between the sealing block (6) and the water outlet pipe head (7).

2. The testing fixture according to claim 1, characterized in that: The lower end face of the air guide block (3) is provided with a first annular protrusion (301) that matches the first stepped hole (501) of the water inlet pipe head (5). The lower end face of the first annular protrusion (301) is coaxially provided with a second annular protrusion (302). The second annular protrusion (302) is used to be inserted into the water inlet (503). Both the first annular protrusion (301) and the second annular protrusion (302) are provided with a through flow channel (303). The flow channel (303) is connected to the internal flow channel of the air guide block (3). The sealing part (4) is used to be installed on the second stepped hole (502) of the water inlet pipe head (5), and abuts against the hole wall of the second stepped hole (502) and the side of the second annular protrusion (302) respectively, and radially seals the gap between them.

3. The testing fixture according to claim 2, characterized in that: The lower end face of the sealing block (6) is provided with a third circular protrusion (601) that matches the third stepped hole (701) of the water outlet head (7). The lower end face of the third circular protrusion (601) is provided with a fourth circular protrusion (602) that is coaxial with the lower end face of the third circular protrusion (601). The fourth circular protrusion (602) is used to plug into the water outlet (703). The sealing part (4) is used to be installed on the fourth step hole (702) of the water outlet head (7), and abuts against the hole wall of the fourth step hole (702) and the side of the fourth circular protrusion (602) respectively, and radially seals the gap between them.

4. The testing fixture according to claim 3, characterized in that: The sealing part (4) is an elastic sealing ring, which is respectively fitted onto the second annular protrusion (302) and the fourth circular protrusion (602).

5. The testing fixture according to claim 4, characterized in that: The diameter of the elastic sealing ring is greater than the outer diameter of the second annular protrusion (302) and the diameter of the fourth circular protrusion (602).

6. The testing fixture according to claim 1, characterized in that: The clamp (2) includes a base plate (202) and a top plate (201). The base plate (202) is fixedly connected to the top plate (201) through a side plate (203). The base plate (202) and the top plate (201) are used to place the water inlet pipe head (5) and the air guide block (3), the water outlet pipe head (7) and the sealing block (6), and the base plate (202) has a base plate opening (202a) for accommodating the water inlet pipe head (5) or the water outlet pipe head (7).

7. The testing fixture according to claim 6, characterized in that: The air guide block (3) is provided with an air inlet connector (1) for connecting to the air inlet device.

8. The testing fixture according to claim 7, characterized in that: The inflation connector (1) is threadedly connected to the air guide block (3). The upper end face of the air guide block (3) is provided with a threaded hole (304) for installing the inflation connector (1). The threaded hole (304) is connected to the internal flow channel of the air guide block (3). The top plate (201) of the clamp (2) has a top plate opening (201a) for accommodating the air inlet (1).

9. The testing fixture according to any one of claims 1 to 8, characterized in that: Both the air guide block (3) and the sealing block (6) are made of brass.

10. A system for detecting the airtightness of a radiator core, characterized in that: It includes a gas source device and a testing fixture as described in any one of claims 1 to 9.

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