Nitrogen charging tool and heat exchanger nitrogen charging equipment

Abstract

The utility model relates to a nitrogen charging tool and heat exchanger nitrogen charging equipment, and relates to the technical field of heat exchanger nitrogen charging. The utility model relates to a nitrogen charging tool, which comprises a nitrogen charging device, a nitrogen discharging device and a nitrogen discharging device, the detection tool is provided with a limiting hole, the nitrogen charging nozzle is inserted into the limiting hole, the detection tool is further provided with a detection structure, an induction part is installed in the detection structure, and the induction part is electrically connected with the nitrogen charging device; when the switching elbow of the heat exchanger is installed in place, the switching elbow can be inserted into the detection structure, and the limiting hole is in butt joint with a nitrogen charging opening of the heat exchanger. When the adapter elbow of the heat exchanger is installed in a staggered mode, the adapter elbow interferes with the detection tool and cannot be inserted into the detection structure, and the limiting hole and the nitrogen charging opening of the heat exchanger are made to be staggered. When the switching elbow is inserted into the detection structure, the switching elbow triggers the induction part, so that the induction part sends a verification signal to the nitrogen charger. The check of the installation position of the elbow joint can be synchronously completed during nitrogen charging, and the risk of dislocation of the elbow joint is reduced.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen purging technology for heat exchangers, and in particular to a nitrogen purging fixture and a nitrogen purging device for heat exchangers. Background Technology

[0002] Heat exchangers have multiple heat exchange pipes, and often connect two separated heat exchange pipes end to end via transition bends to allow the heat exchange medium to flow through different pipes. To ensure the circulation of the heat exchange medium in the heat exchanger and prevent leakage during use, nitrogen-purged welding is used to connect the heat exchange pipes to the connecting transition bends. Therefore, nitrogen purging is required before welding to prevent oxidation of the heat exchange pipes during the welding process.

[0003] However, due to the dense heat exchange pipes in the heat exchanger, a large number of transition bends need to be installed. Careless installation can easily lead to misalignment of these bends. Directly welding misaligned transition bends will cause malfunctions in the heat exchanger system.

[0004] Currently, most welding inspections are done visually by operators, which is inefficient and carries the risk of missed detections. Utility Model Content

[0005] This utility model provides a nitrogen-filling tool for a heat exchanger, used to detect the installation accuracy of the transition bend during the nitrogen-filling process, and to avoid welding connections to misaligned transition bends.

[0006] In a first aspect, this utility model provides a nitrogen-filling fixture, comprising:

[0007] Nitrogen filler, which has a nitrogen filling nozzle; and

[0008] The fixture has a limiting hole, into which the nitrogen filling nozzle is inserted. The fixture also has a detection structure, in which a sensing component is installed. The sensing component is electrically connected to the nitrogen filler.

[0009] When the heat exchanger's transition bend is installed in place, the transition bend can be inserted into the detection structure, and the limiting hole can be aligned with the nitrogen charging port of the heat exchanger.

[0010] When the transition bend of the heat exchanger is misaligned, the transition bend interferes with the gauge and cannot be inserted into the detection structure, causing the limiting hole to be misaligned with the nitrogen charging port of the heat exchanger.

[0011] When the adapter bend is inserted into the detection structure, the adapter bend will trigger the sensing component, causing the sensing component to send a verification signal to the nitrogen filler.

[0012] In one embodiment, the gauge includes a detection surface, the detection structure is disposed on the detection surface, the detection structure includes a plurality of detection parts spaced apart from each other, the detection parts correspond one-to-one with the transition bend, and at least one of the detection parts is provided with the sensing component;

[0013] When the adapter bend is accurately positioned, it can be inserted into the corresponding detection part, causing the sensing component to be triggered.

[0014] When any transition bend is misaligned, the transition bend comes into contact with the detection surface.

[0015] In one embodiment, the detection structure has at least two detection parts of different shapes to detect transition bends of different shapes.

[0016] In one embodiment, each of the detection units is equipped with a corresponding sensing element, and a verification signal is sent to the nitrogen filler only when all sensing elements are triggered.

[0017] In one embodiment, the sensing element is a micro switch.

[0018] In one embodiment, the nitrogen filler is provided with a timer, which is electrically connected to the sensing component to control the nitrogen filler to perform nitrogen filling of the heat exchanger for a first nitrogen filling duration when the sensing component is triggered.

[0019] In one embodiment, at least one of the nitrogen filling nozzles is electrically connected to the gauge to receive electrical signals from the sensing element.

[0020] In one embodiment, the nitrogen filler includes a housing with a cavity formed inside it. The housing has an air inlet communicating with the cavity, and the nitrogen filling nozzle is installed in the housing and communicates with the cavity.

[0021] In one embodiment, the box body is further provided with a plurality of air outlets, and the nitrogen filling nozzle is detachably installed at the corresponding air outlet to communicate with the cavity;

[0022] The nitrogen filler also includes several plugs, which are detachably installed in the housing to block the outlets where no nitrogen filling nozzle is installed. The number of plugs plus the number of nitrogen filling nozzles equals the number of outlets.

[0023] Secondly, this utility model also provides a nitrogen charging device for a heat exchanger, which includes a gas source and the aforementioned nitrogen charging fixture, wherein the nitrogen filler of the nitrogen charging fixture is connected to the gas source.

[0024] Compared with existing technologies, the advantages of this invention are that it can detect the bend joints during nitrogen filling through the detection structure on the fixture. When the adapter bends are installed in place, each adapter bend can be inserted into the detection structure, triggering the sensing component within the detection structure. This allows the nitrogen filler to receive a verification signal from the sensing component, thus enabling nitrogen filling. If the adapter bends are misaligned, they will interfere with the fixture and cannot be inserted into the detection structure, thus failing to trigger the sensing component within the detection structure. The nitrogen filler will not start filling because it has not received a verification signal, avoiding the problem of difficulty in identifying the installation position of the bend joints during nitrogen filling. It can simultaneously verify the installation position of the bend joints during nitrogen filling, reducing the risk of misalignment. Attached Figure Description

[0025] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0026] Figure 1 This is a front view schematic diagram of the nitrogen filling device in use in an embodiment of this utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of the nitrogen filling device in use in an embodiment of this utility model;

[0028] Figure 3 This is a three-dimensional structural diagram of the heat exchanger matched with the nitrogen charging device in an embodiment of this utility model;

[0029] Figure 4 This is a three-dimensional structural diagram of the heat exchanger matched with the nitrogen charging device in an embodiment of this utility model when the adapter bend is not installed.

[0030] Figure 5 This is a three-dimensional structural schematic diagram of the nitrogen filling device in an embodiment of this utility model;

[0031] Figure 6 This is a top view of the inspection fixture in an embodiment of this utility model;

[0032] Figure 7 yes Figure 6 A magnified schematic diagram of the partial structure at point A in the middle;

[0033] Figure 8 This is a three-dimensional structural diagram of the inspection tool in an embodiment of this utility model;

[0034] Figure 9 This is a three-dimensional structural diagram of the nitrogen filler in an embodiment of this utility model.

[0035] Figure label:

[0036] 100. Nitrogen filling fixture;

[0037] 110. Nitrogen purifier; 111. Nitrogen purging nozzle; 112. Housing; 113. Air inlet; 114. Air outlet; 115. Plug;

[0038] 120. Inspection tool; 121. Limiting hole; 122. Inspection section; 123. Sensing component;

[0039] 200, Heat exchanger; 210, Nitrogen charging port; 220, Adapter bend. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] See Figure 1 and Figure 2 As shown, the nitrogen filling fixture 100 provided in this application includes a nitrogen filler 110, on which a nitrogen filling nozzle 111 is provided. The nitrogen filling fixture 100 also includes a gauge 120, on which a limiting hole 121 is provided, and the nitrogen filling nozzle 111 is inserted into the limiting hole 121.

[0042] Combination Figure 3 as well as Figure 4 As can be seen, the heat exchanger 200 is connected to multiple transition bends 220. If not properly connected, the transition bends 200 can easily become misaligned, resulting in incorrect flow direction in the heat exchanger's piping and potentially causing leaks.

[0043] See Figures 5-7 As shown, a detection structure is also provided on the inspection fixture 120, and a sensing component 123 is installed at the detection structure. The sensing component 123 is electrically connected to the nitrogen filler 110.

[0044] In use, the detection structure can be installed on the side of the heat exchanger 200 where the transition bends 220 are located. If all the transition bends 220 of the heat exchanger 200 are installed in place, they can all be inserted into the detection structure. Because a sensing element 123 is provided at the detection structure, the insertion status of the transition bends 220 can be detected by the sensing element 123, and a verification signal is sent to the nitrogen filler 110 when the transition bends 220 are inserted into the detection structure. The nitrogen filler 110 can determine whether the transition bends 220 are installed in place based on the verification signal sent by the sensing element 123, thus preventing the nitrogen filler 110 from filling nitrogen when the transition bends 220 are misaligned.

[0045] If the heat exchanger 200 has some misaligned connecting bends 220, it will cause interference between the connecting bends 220 and the gauge 120, preventing the connecting bends 220 from being inserted into the detection structure. Since the connecting bends 220 are not inserted into the detection structure, the sensing element 123 in the detection structure will not be triggered, meaning the sensing element 123 will not send a test signal to the nitrogen filler 110. Since the nitrogen filler 110 does not receive the test signal, it can recognize that the connecting bends 220 are misaligned and will not perform nitrogen filling, thus avoiding nitrogen welding of the heat exchanger 200 with misaligned connecting bends 220, which would affect the circulation of the heat exchange medium inside the heat exchanger 200.

[0046] In addition, the gauge 120 in this application can also be used to locate the nitrogen filling position. Since the gauge 120 has a detection structure, when the adapter bend 220 is matched with the detection structure and inserted into the detection structure, the relative position of the gauge 120 and the heat exchanger 200 is fixed. By adjusting the position of the limiting hole 121 on the gauge 120, the limiting hole 121 on the gauge 120 is aligned with the nitrogen filling port 210 of the heat exchanger 200 when the gauge 120 is connected to the heat exchanger 200. This facilitates the connection between the nitrogen filler 110 inserted into the limiting hole 121 and the nitrogen filling port 210 of the heat exchanger 200.

[0047] Understandably, in some cases, the nitrogen filler 110 can be configured to perform nitrogen filling upon receiving a verification signal from the sensing element 123, enabling continuous calibration and nitrogen filling operations and improving filling efficiency. In some embodiments, the nitrogen filler 110 can also be configured to perform nitrogen filling only when multiple conditions are met simultaneously. One condition is receiving a verification signal from the sensing element 123, while other conditions can be set according to actual conditions, such as whether the temperature has reached the nitrogen filling temperature and whether the gas purity meets the nitrogen filling requirements.

[0048] In some implementations, a signal device can be installed on the nitrogen purifier 110. When the sensing element 123 sends a verification signal to the nitrogen purifier 110, the signal device can emit a light or sound signal to remind the operator that all the transition bends 220 on the heat exchanger 200 are installed in place. The operator can then determine whether to proceed with the nitrogen purging of the heat exchanger 200 based on the actual situation. The signal device can be an indicator light, configured to illuminate a specific color LED when the nitrogen purifier 110 receives the verification signal from the sensing element 123, thus reminding the operator that all the transition bends 220 on the heat exchanger 200 are installed in place.

[0049] Understandably, the signaling device can also be used to display other information, such as whether the temperature has reached the nitrogen purging temperature and whether the gas purity meets the nitrogen purging requirements. This allows operators to directly understand whether the current environment is suitable for nitrogen purging.

[0050] The heat exchanger 200 in this application can be either a condenser or an evaporator. Both have complex circulation piping and often connect adjacent pipes via bends.

[0051] See Figure 1 , Figure 6 as well as Figure 7 As shown, in some implementations, the gauge 120 includes a detection surface, and a detection structure is disposed on the detection surface. The detection structure includes a plurality of detection parts 122 spaced apart from each other. Each detection part 122 corresponds to a connecting bend 220. At least one detection part 122 is provided with a sensing element 123. When the connecting bend 220 is accurately positioned, the connecting bend 220 can be inserted into the corresponding detection part 122, thereby triggering the sensing element 123. When any one of the connecting bends 220 is misaligned, the connecting bend 220 abuts against the detection surface.

[0052] Since the detection structure has multiple detection sections 122 spaced apart, each detection section 122 can only be inserted into the correctly installed adapter bend 220. When any adapter bend 220 is misinstalled, the misinstalled adapter bend 220 will collide with the gauge 120, thereby increasing the gap between the gauge 120 and the heat exchanger 200. As a result, none of the adapter bends 220 can be inserted into the corresponding detection section 122, and the sensing element 123 will not be triggered.

[0053] In some implementations, the heat exchanger 200 is equipped with transition bends 220 of different shapes. To accommodate the insertion of these transition bends 220, the detection structure can have detection sections 122 of various shapes, and the corresponding transition bends 220 can be detected through these detection sections 122. For example, in some cases, the transition bends 220 are U-shaped tubes, and the corresponding detection section 122 can be configured as a waist-shaped hole structure so that the U-shaped transition bends 220 can be inserted and pass through the detection section 122. In other cases, where the transition pipes are tee pipes, the outline of the detection section 122 can be set to a shape corresponding to the transition bend 220 to avoid interference with the inspection fixture 120 when the transition bend 220 is inserted.

[0054] In some implementations, a sensing element 123 can be provided inside each detection section 122. The sensing element 123 sends a verification signal to the nitrogen filler 110 only when each sensing element 123 detects that the adapter bend 220 is inserted into the corresponding detection section 122. If some sensing elements 123 do not detect the insertion of the adapter bend 220, it indicates that the adapter bend 220 is not inserted into some detection sections 122, that is, there is a case where the adapter bend 220 is missing. In this case, no verification signal is sent to the nitrogen filler 110.

[0055] In other implementations, a sensing element 123 may be provided only inside part of the detection unit 122. The sensing element 123 can be used to identify whether there is a risk of misinstallation of the adapter bend 220, and the operator can visually judge whether the adapter bend 220 is missing.

[0056] See Figure 5 and Figure 6 As shown, in some implementations, the detection part 122 is a hole. When all the adapter bends 220 on the heat exchanger 200 are installed in place, the adapter bends 220 can pass through the detection part 122, thereby reducing the distance between the gauge 120 and the heat exchanger 200, so that the nitrogen charging nozzle 111 inserted into the limiting hole 121 can be connected to the nitrogen charging port 210 of the heat exchanger 200.

[0057] It is understandable that in some other implementations, the detection unit 122 can also be configured as a slot structure, which also allows the adapter bend 220 to be inserted into the corresponding detection unit 122.

[0058] Since the sensing component 123 in this application is located inside the detection unit 122, the probability of foreign objects triggering the sensing component 123 can be reduced, and the sensing component 123 can be protected to a certain extent.

[0059] The sensing component 123 can be fixed on the inner wall of the detection unit 122. If the sensing component 123 needs to be connected to a power source to work, such as a laser sensor or an ultrasonic sensor, an electrical connection wire and a power source can be provided inside the fixture 120. One end of the electrical connection wire is connected to the power source, and the other end of the electrical connection wire is electrically connected to the sensing component 123 provided in the detection unit 122.

[0060] Understandably, some sensing components 123 can generate weak electrical signals when triggered without needing a power supply. For example, piezoelectric sensors can generate piezoelectric signals when compressed, or Hall sensors can generate electrical signals when they detect changes in the magnetic field. For such sensing components 123 that do not require an external power supply, there is no need to install a power supply in the fixture 120.

[0061] In some implementations, the detection unit 122 is a microswitch, with one side connected to a power source located within the fixture 120, and the other side connected to the nitrogen filler 110. The microswitch is a push-button design and can be configured such that when the adapter bend 220 is detected inserted into the detection unit 122, the microswitch closes due to the contact of the adapter switch, thereby connecting the power source to the nitrogen filler 110 and transmitting a verification signal. When the adapter bend 220 is not inserted into the detection unit 122, the microswitch opens due to its own elasticity, preventing the power source within the fixture 120 from connecting to the nitrogen filler 110 and thus avoiding the transmission of a verification signal to the nitrogen filler 110.

[0062] It is understood that the micro switch provided above is a normally open switch, which will only close when the adapter bend 220 is inserted into the detection section 122. In some other implementations, the micro switch may also be a normally closed switch, which will only open due to the resistance of the adapter bend 220 when it is inserted into the detection section 122.

[0063] In some implementations, a timer is also provided in the nitrogen filler 110. The timer is electrically connected to the sensing element 123 so that when the sensing element 123 is triggered, the nitrogen filler 110 is controlled to perform nitrogen filling of the heat exchanger 200 for a first nitrogen filling duration.

[0064] In other words, the nitrogen charging time of the heat exchanger 200 can be timed by setting a timer inside the nitrogen filler 110. This facilitates the nitrogen charging process for personnel. The nitrogen filler 110 can be equipped with an adjustment button or touch screen, and the timer can be electrically connected to the adjustment button or touch screen to adjust the timer's set duration, thereby completing the nitrogen charging work under different conditions.

[0065] It is understandable that a timer can be either a time relay or a counter, in order to achieve the function of timing.

[0066] In some implementations, a control module can be installed within the nitrogen filler 110, with a timer and sensor 123 electrically connected to the control module. The control module can then use the verification signal sent by the sensor 123 and the timer's electrical signal to determine whether the nitrogen filler 110 needs to be controlled for nitrogen filling. For example, the control module determines whether to perform nitrogen filling only after receiving the verification signal from the sensor 123. If nitrogen filling is determined to be performed, the nitrogen filler 110 is controlled to fill the heat exchanger 200 with nitrogen, and simultaneously the timer starts counting. When the timer finishes counting, the controller controls the nitrogen filler 110 to stop filling the heat exchanger 200 with nitrogen.

[0067] Understandably, the control module here can be a PLC module, or it can be a microcontroller, other control chips or control terminals, as long as it can realize the nitrogen filling control of the nitrogen filler 110.

[0068] See Figure 1 , Figure 5 as well as Figure 9 As shown, in some implementations, at least one nitrogen filling nozzle 111 is electrically connected to the gauge 120 to receive electrical signals from the sensing element 123. The nitrogen filling nozzle 111 may be made of a conductive material and has contacts within a limiting hole 121 that are electrically connected to the sensing element 123. When the nitrogen filling nozzle 111 is inserted into the limiting hole 121, the contacts within the limiting hole 121 are electrically connected to the conductive nitrogen filling nozzle 111, thereby enabling the electrical signals sent by the sensing element 123 to be transmitted to the nitrogen filling nozzle 111. The control module within the nitrogen filler 110 is electrically connected to the nitrogen filling nozzle 111 to receive verification signals transmitted from the nitrogen filling nozzle 111.

[0069] Understandably, contacts for electrical connection with the control module can also be provided on the outer surface of the nitrogen filling nozzle 111. Through the electrical connection between the contacts of the nitrogen filling nozzle 111 and the contacts inside the limiting hole 121, the verification signal emitted by the sensing component 123 can be transmitted. The transmission of electrical signals is achieved through the cooperation between the nitrogen filling nozzle 111 and the limiting hole 121. When the control device receives the verification signal, it not only indicates that the adapter bends 220 on the heat exchanger 200 are all inserted into the corresponding detection parts 122, but also that the nitrogen filling nozzle 111 and the limiting hole 121 are installed accurately, thus avoiding nitrogen filling failure due to inaccurate installation of the nitrogen filling nozzle 111.

[0070] like Figure 9 As shown, in some implementations, the nitrogen filler 110 is provided with multiple nitrogen filling nozzles 111. Some of the nitrogen filling nozzles 111 can be made of conductive material or have contacts on their outer surface, while the other nitrogen filling nozzles 111 can be made of insulating structure and do not serve to transmit verification signals.

[0071] Of course, in some implementations, the transmission of the verification signal can also be achieved in other ways. For example, a wireless signal transmitting module electrically connected to the sensing component 123 can be set in the fixture 120, and a wireless signal receiving module electrically connected to the control module can be set in the nitrogen filler 110. When the sensing component 123 triggers the transmission of the verification signal, the wireless signal transmitting module sends a wireless signal outward, and the wireless signal receiving module is used to receive the signal. The control module then determines whether to perform nitrogen filling based on the received wireless signal.

[0072] Alternatively, the nitrogen filler 110 can be electrically connected to the gauge 120 directly via a wire, and the wire can be used to transmit the verification signal.

[0073] See Figure 9As shown, the nitrogen filling nozzle 111 has a conical structure. When the nitrogen filling nozzle 111 is inserted into the limiting hole 121, the smaller end of the nitrogen filling nozzle 111 is inserted into the limiting hole 121 first, while the larger end of the nitrogen filling nozzle 111 is inserted into the limiting hole 121 later. The conical outer curved surface of the nitrogen filling nozzle 111 can be used to achieve a positioning and guiding function, so that the nitrogen filling nozzle 111 inserted into the limiting hole 121 is coaxial with the limiting hole 121.

[0074] In some implementations, the nitrogen filler 110 and the gauge 120 are detachably connected, allowing for the calibration of the transition bend 220 on the heat exchanger 200 by replacing different gauges 120, thus reducing the variety of nitrogen fillers 110 and lowering costs. In other implementations, the nitrogen filler 110 and the gauge 120 can be integrated, eliminating the need for assembling the nitrogen filler 110 and the gauge 120.

[0075] See Figure 1 as well as Figure 5 As shown, in some implementations, the nitrogen purifier 110 includes a housing 112 with a cavity formed inside. The housing 112 is provided with an air inlet 113 communicating with the cavity. A nitrogen purging nozzle 111 is installed in the housing 112 and communicates with the cavity. In use, a gas source is connected to the air inlet 113 of the housing 112 so that nitrogen gas in the gas source can flow into the cavity of the housing 112. Since the nitrogen purging nozzle 111 is connected to the cavity, nitrogen gas can be guided through the nitrogen purging nozzle 111 into the nitrogen purging port 210 of the heat exchanger 200 to achieve nitrogen purging.

[0076] See Figure 1 , Figure 5 as well as Figure 9 As shown, in some implementations, the housing 112 is further provided with several air outlets 114. Nitrogen filling nozzles 111 are detachably installed at the corresponding air outlets 114 to communicate with the cavity. The nitrogen filler 110 also includes several plugs 115, which are detachably installed in the housing 112 (in this application, the plugs 115 are embedded inside the air outlets 114 and not exposed) to block the air outlets 114 where no nitrogen filling nozzles 111 are installed. The number of plugs 115 plus the number of nitrogen filling nozzles 111 equals the number of air outlets 114. Internal threads can be provided in the air outlets 114, and external threads can be provided on the plugs 115 and nitrogen filling nozzles 111, allowing for detachable connection between the plugs 115, nitrogen filling nozzles 111, and air outlets 114 via threaded connections.

[0077] In other words, nitrogen charging can be achieved by removing the nitrogen charging nozzle 111 and installing it on the outlet 114 in other locations, thus enabling nitrogen charging to the nitrogen charging port 210 in different locations. Furthermore, the removable plug 115 can be used to seal the outlet 114 where the nitrogen charging nozzle 111 is not installed, preventing nitrogen leakage from the outlet 114 during the charging process. This allows the nitrogen charger 110 provided in this application to adapt to different types of heat exchangers 200.

[0078] Secondly, this utility model also provides a nitrogen charging device for a heat exchanger 200, which includes a gas source and the aforementioned nitrogen charging fixture 100, wherein the nitrogen charging device 110 of the nitrogen charging fixture 100 is connected to the gas source. Because the nitrogen charging device for the heat exchanger 200 has the aforementioned nitrogen charging fixture 100, a calibration fixture for the installation of the transition bend 220 on the heat exchanger 200 can be simultaneously performed during the nitrogen charging preparation stage, avoiding nitrogen charging of the heat exchanger 200 with misaligned transition bend 220 installation, reducing nitrogen consumption, and improving the efficiency of the nitrogen charging operation.

[0079] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A nitrogen charging tool characterized by comprising: It includes: Nitrogen filler, which has a nitrogen filling nozzle; as well as The fixture has a limiting hole, into which the nitrogen filling nozzle is inserted. The fixture also has a detection structure, in which a sensing component is installed. The sensing component is electrically connected to the nitrogen filler. When the heat exchanger's transition bend is installed in place, the transition bend can be inserted into the detection structure, and the limiting hole can be aligned with the nitrogen charging port of the heat exchanger. When the transition bend of the heat exchanger is misaligned, the transition bend interferes with the gauge and cannot be inserted into the detection structure, causing the limiting hole to be misaligned with the nitrogen charging port of the heat exchanger. When the adapter bend is inserted into the detection structure, the adapter bend will trigger the sensing component, causing the sensing component to send a verification signal to the nitrogen filler.

2. The nitrogen-filling fixture according to claim 1, characterized in that, The gauge includes a detection surface, the detection structure is disposed on the detection surface, the detection structure includes a plurality of detection parts spaced apart from each other, the detection parts correspond one-to-one with the transition bend, and at least one of the detection parts is provided with the sensing component; When the adapter bend is accurately positioned, it can be inserted into the corresponding detection part, causing the sensing component to be triggered. When any transition bend is misaligned, the transition bend comes into contact with the detection surface.

3. The nitrogen-filling fixture according to claim 2, characterized in that, The detection structure has at least two detection parts with different shapes to detect transition bends of different shapes.

4. The nitrogen-filling fixture according to claim 2, characterized in that, Each of the aforementioned detection units is equipped with a corresponding sensing component, and a verification signal is sent to the nitrogen filler only when all sensing components are triggered.

5. The nitrogen-filling fixture according to any one of claims 1-4, characterized in that, The sensing component is a micro switch.

6. The nitrogen-filling fixture according to any one of claims 1-4, characterized in that, The nitrogen filler is equipped with a timer, which is electrically connected to the sensing component to control the nitrogen filler to perform nitrogen filling of the heat exchanger for a first nitrogen filling duration when the sensing component is triggered.

7. The nitrogen-filling fixture according to any one of claims 1-4, characterized in that, At least one of the nitrogen filling nozzles is electrically connected to the gauge to receive electrical signals from the sensing element.

8. The nitrogen-filling fixture according to any one of claims 1-4, characterized in that, The nitrogen filler includes a housing with a cavity formed inside. The housing has an air inlet that communicates with the cavity. The nitrogen filling nozzle is installed in the housing and communicates with the cavity.

9. The nitrogen-filling fixture according to claim 8, characterized in that, The box body is also provided with several air outlets, and the nitrogen filling nozzle is detachably installed at the corresponding air outlet to communicate with the cavity; The nitrogen filler also includes several plugs, which are detachably installed in the housing to block the outlets where no nitrogen filling nozzle is installed. The number of plugs plus the number of nitrogen filling nozzles equals the number of outlets.

10. A heat exchanger nitrogen charging apparatus characterized by comprising: It includes, Gas source; as well as The nitrogen charging tool according to claims 1-9, wherein the nitrogen charger of the nitrogen charging tool is in communication with the gas source.

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