A normally open and normally closed air charging valve for air conditioning pipes

Abstract

This utility model discloses a normally open and normally closed inflation valve for air conditioning pipe inflation, comprising: a connector, which is a hollow structure with openings at both ends, the top of which can be detachably installed on the connecting head of the air conditioning pipe; a sealing head, which is used to close the opening at the bottom of the connector, the sealing head being slidably disposed within the cavity of the connector along the axial direction of the connector and being rotatable, and a spring provided between the sealing head and the connector for applying a force to the sealing head to close the opening at the bottom of the connector; wherein, a locking mechanism is provided within the cavity of the connector to restrict the sliding of the sealing head relative to the connector, and when the connector and the sealing head are in the locked state, the sealing head does not close the opening at the bottom of the connector. This utility model can realize switching between normally open and normally closed states, improving operational convenience while expanding the application range of the inflation valve.

Description

Technical Field

[0001] This utility model relates to the field of inflation valves, specifically to a normally open and normally closed inflation valve for inflation of air conditioning pipelines used for leak detection of air conditioning units using helium mass spectrometry. Background Technology

[0002] Before assembling an air conditioner's two components (evaporator and condenser), leak detection at easily leaking points (such as weld joints) is typically performed using helium mass spectrometry. This method mainly includes three processes: helium charging, leak detection, and helium recovery. During the helium charging operation, the charging device injects helium into the air conditioner's two components through the air conditioner's throttle pipe. However, relying solely on workers to connect the charging device and the throttle pipe is time-consuming and labor-intensive, and cannot meet the helium charging speed requirements of modern air conditioning production lines.

[0003] Currently, a filling valve is usually installed on the throttle pipe for quick connection. To prevent helium leakage after filling, the filling valve is usually a normally closed structure (i.e., it is only open during helium filling and automatically switches from open to closed after filling). However, in some cases (such as when welding pipes with filling valves installed), welding is performed without nitrogen filling in the throttle pipe. At high temperatures, the metal surface inside the throttle pipe is prone to react fully with oxygen in the air to form oxide scale. During use, the oxide scale may fall off and block the pipe. Although nitrogen can be pre-filled into the throttle pipe to limit oxide scale formation during welding, the normally closed charging valve keeps the throttle pipe in a sealed state. Welding operations cause the nitrogen in the throttle pipe to expand due to heat, which can create pores in the molten pool when solder is added, or even cause welding bubbles, affecting the welding effect between pipes. While opening the normally closed charging valve during welding can release the expanded nitrogen and reduce its impact on the welding position, forcing the normally closed charging valve to remain open also increases the workload to some extent. Utility Model Content

[0004] The purpose of this utility model is to provide a normally open and normally closed inflation valve for air conditioning pipeline inflation. This inflation valve can switch between normally open and normally closed states, which improves the convenience of operation and expands the application range of the inflation valve.

[0005] The technical solution adopted by this utility model to solve the above problems is:

[0006] A normally open and normally closed inflation valve for air conditioning pipe inflation includes:

[0007] The connector is a hollow structure with openings at both ends. The top of the connector can be detachably installed on the mating head of the air conditioning pipe.

[0008] A sealing head is used to close the opening at the bottom of the connector. The sealing head is slidably disposed in the cavity of the connector along the axial direction and can rotate. A spring is provided between the sealing head and the connector to apply a force to the sealing head to close the opening at the bottom of the connector. The two ends of the spring abut against the sealing head and the connector respectively.

[0009] The cavity of the connector is provided with a locking mechanism to restrict the sliding of the sealing head relative to the connector. When the connector and the sealing head are locked, the sealing head does not close the opening at the bottom of the connector.

[0010] As a further limitation of this utility model, the locking mechanism includes a locking member, which is detachably installed in the cavity of the connector. The locking member is a hollow structure with openings at both ends. The top end of the sealing head passes through the locking member. Several vent holes are provided through the top and bottom ends of the locking member, arranged at equal angles around the central axis of the locking member. A locking block is slidably disposed in the cavity of the locking member along its axial direction. The locking block is fixed to the top end of the sealing head. The cavity of the locking member is divided into an upper chamber and a lower chamber by the locking block. Several through holes are provided through the side of the locking member, arranged at equal angles around the central axis of the locking member. When the sealing head does not seal the opening at the bottom end of the connector, the upper chamber and the lower chamber can be connected through the through holes. The side of the locking block is provided with protrusions corresponding to the through holes. The side of the locking member is provided with locking holes that are adapted to the protrusions. The locking holes are connected to the through holes.

[0011] As a further limitation of this utility model, a sealing gasket is provided in the cavity of the connector. The sealing gasket is annular and is sandwiched between the connector and the mating head when the connector is installed on the mating head.

[0012] As a further limitation of this utility model, the locking member includes a fixing member and a plug-in member. The fixing member is detachably installed in the cavity of the connector. The plug-in member is located between the sealing gasket and the fixing member. When the connector is installed on the mating head, the plug-in member is clamped between the sealing gasket and the fixing member. The top surface of the fixing member is provided with a plurality of first locking blocks arranged at equal angles around its central axis. The bottom surface of the plug-in member is provided with second locking blocks corresponding to the first locking blocks. A slot is opened between adjacent first locking blocks. The second locking block is provided with a plug that matches the slot. When the plug is inserted into the slot, the fixing member and the plug-in member surround to form a through hole and the first locking block and the second locking block form a locking hole.

[0013] As a further limitation of this utility model, the closing head is provided with a stopper, the spring is located between the locking member and the stopper and its two ends respectively abut against the locking member and the stopper, a sealing sleeve is sandwiched between the bottom end of the closing head and the stopper, the sealing sleeve is fitted on the closing head, and the maximum diameter of the sealing sleeve is greater than the opening diameter of the bottom end of the connector.

[0014] As a further limitation of this utility model, the connector includes a locking sleeve and a connecting sleeve for detachable connection of the mating head. Both the locking sleeve and the connecting sleeve are hollow structures with openings at both ends. The closing head and the locking mechanism are both located in the cavity of the locking sleeve. The bottom end of the connecting sleeve is sleeved on the top end of the locking sleeve. When the connecting sleeve is connected to the mating head, the top end of the locking sleeve is sandwiched between the bottom end of the connecting sleeve and the mating head.

[0015] As a further limitation of this utility model, the edge of the top of the locking sleeve is folded outward to form a folded edge, and the connecting sleeve is provided with a limiting part to prevent the top of the locking sleeve from detaching from its bottom end. When the connecting sleeve is connected to the mating head, the folded edge is sandwiched between the bottom end of the mating head and the limiting part.

[0016] Compared with the prior art, this utility model has the following advantages and effects:

[0017] This invention, through the structural design between the connector and the sealing head, allows the inflation device to be quickly connected to the throttle pipe via the connector when the connector is installed on the throttle pipe, shortening the connection operation time and thus improving operational efficiency. Furthermore, combined with the locking structure's locking effect on the sealing head, it enables the inflation valve to switch between normally open and normally closed states, thereby meeting the usage requirements of normally open or normally closed inflation valves during the assembly of air conditioning units. This not only improves operational convenience but also expands the applicability of the inflation valve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a normally open and normally closed inflation valve for air conditioning pipeline inflation according to this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of a normally open and normally closed inflation valve for air conditioning pipeline inflation under one usage state according to the present invention.

[0020] Figure 3 yes Figure 2 The diagram shows the structure of the locking mechanism.

[0021] Figure 4 yes Figure 3 The diagram shows the structure of the locking element.

[0022] Figure 5 This is a schematic diagram of the structure of a normally open and normally closed inflation valve for air conditioning pipeline inflation under the second usage state of this utility model.

[0023] The components include: connector 1, locking sleeve 11, connecting sleeve 12, folded edge 13, limiting part 14, sealing head 2, spring 3, locking mechanism 4, locking part 41, vent hole 42, locking block 43, through hole 44, protrusion 45, locking hole 46, upper chamber 51, lower chamber 52, sealing gasket 6, abutment 7, sealing sleeve 71, fixing part 81, plug-in part 82, first locking block 83, second locking block 84, slot 85, insert 86, throttle pipe 9, and connector 91. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0025] See Figures 1-5 This embodiment discloses a normally open and normally closed air filling valve for air conditioning pipes, including a connector 1 and a sealing head 2. The connector 1 is a hollow structure with openings at both ends. The top end of the connector 1 can be detachably installed on the connecting head of the air conditioning pipe. The sealing head 2 is used to close the opening at the bottom end of the connector 1. The sealing head 2 is slidably disposed in the cavity of the connector 1 along the axial direction of the connector 1 and can rotate. A spring 3 is provided between the sealing head 2 and the connector 1 to apply a force to the sealing head 2 to close the opening at the bottom end of the connector 1. The two ends of the spring 3 abut against the sealing head 2 and the connector 1, respectively. A locking mechanism 4 is provided in the cavity of the connector 1 to restrict the sliding of the sealing head 2 relative to the connector 1. When the connector 1 and the sealing head 2 are in the locked state, the sealing head 2 does not close the opening at the bottom end of the connector 1.

[0026] The locking mechanism 4 includes a locking member 41, which is detachably installed in the cavity of the connector 1. The locking member 41 is a hollow structure with openings at both ends. The top end of the closed head 2 passes through the locking member 41. Several vent holes 42 are provided at equal angles around the central axis of the locking member 41 at both the top and bottom ends. A locking block 43 is slidably disposed in the cavity of the locking member 41 along its axial direction. The locking block 43 is fixed to the top end of the closed head 2. The cavity of the locking member 41 is slidably connected to the locking block. The upper chamber 51 and the lower chamber 52 are separated by a partition 43. Several through holes 44 are provided on the side of the locking member 41, which are arranged at equal angles around the central axis of the locking member 41. When the sealing head 2 does not close the opening at the bottom of the connecting head 1, the upper chamber 51 and the lower chamber 52 can be connected through the through holes 44. The side of the locking block 43 is provided with protrusions 45 that correspond one-to-one with the through holes 44. The side of the locking member 41 is provided with locking holes 46 that are adapted to the protrusions 45. The locking holes 46 are connected to the through holes 44.

[0027] Before use, the top of connector 1 on the inflation valve is detachably installed on the welding head welded to the inflation port of the air conditioning pipe. At this time, the sealing head 2 closes the opening at the bottom of connector 1 under the action of spring 3, the protrusion 45 is located in the through hole 44, and the bottom end of the sealing head 2 is exposed on the opening at the bottom of connector 1. The inflation valve is in the normally closed state. Figure 5 As shown in the image.

[0028] When inflating the throttle hose, a tool can be used to push the sealing head 2 into the connector 1 a certain distance, and then rotate it relative to the connector 1 by a certain angle (e.g., using pliers to clamp the bottom end of the sealing head 2 and rotate and push it). This releases the sealing head 2 from the opening at the bottom end of the connector 1. At this time, the spring 3 is compressed and the protrusion 45 is located in the locking hole 46. The length of the bottom end of the sealing head 2 protruding from the opening at the bottom end of the connector 1 is shortened, and the inflation valve is in the normally open state (e.g., ...). Figure 2 As shown in the figure, high-pressure gas can be normally injected into the throttle pipe through the inflation valve. After inflation is completed, the sealing head 2 is rotated relative to the connector 1 again using a tool, so that the protrusion 45 moves out of the locking hole 46 and back into the through hole 44. Thus, the sealing head 2 can be reset by the force of the spring 3 to restore its original state and restore the closure of the bottom opening of the connector 1. The inflation valve is in the normally closed state.

[0029] During pipe welding, the inflation valve is switched from the normally closed state back to the normally open state. This allows the nitrogen gas, which expands due to the high welding temperature, to escape normally, reducing its impact on the welding position. Furthermore, the nitrogen filling in the throttle pipe helps expel air from the pipe, reducing the risk of oxide scale formation on the inner wall of the throttle pipe during welding. After welding is completed, the inflation valve is switched back to the normally closed state.

[0030] See Figure 1 , Figure 2 The connector 1 includes a locking sleeve 11 and a connecting sleeve 12 for detachable connection to the mating head. Both the locking sleeve 11 and the connecting sleeve 12 are hollow structures with openings at both ends. The closed head 2 and the locking mechanism 4 are both located within the cavity of the locking sleeve 11. The bottom end of the connecting sleeve 12 is fitted onto the top end of the locking sleeve 11. When the connecting sleeve 12 is connected to the mating head, the top end of the locking sleeve 11 is sandwiched between the bottom end of the connecting sleeve 12 and the mating head. The modular structure of the connector 1 reduces the manufacturing difficulty of the connector 1 and facilitates the assembly of the internal components of the locking sleeve 11, ensuring the production and assembly efficiency of the inflation valve. Furthermore, the applicable range of the inflation valve can be expanded by changing the diameter of the connecting sleeve 12, improving the convenience of expanding the specifications of the inflation valve.

[0031] In this embodiment, the connecting sleeve 12 and the connector can be connected by a threaded connection.

[0032] See Figure 2 The top edge of the locking sleeve 11 is folded outward to form a folded edge 13. The connecting sleeve 12 is provided with a limiting part 14 to prevent the top of the locking sleeve 11 from detaching from its bottom end. When the connecting sleeve 12 is connected to the mating head, the folded edge 13 is sandwiched between the bottom end of the mating head and the limiting part 14. This facilitates the assembly of the locking sleeve 11, the connecting sleeve 12 and the mating head, while also improving the strength and sealing of the three-way connection.

[0033] See Figure 2 The cavity of the connector 1 is provided with a sealing gasket 6, which is annular. When the connector 1 is installed on the mating head, the sealing gasket 6 is sandwiched between the connector 1 and the mating head, which helps to improve the sealing effect of the connection between the connector 1 and the mating head.

[0034] In this embodiment, the sealing gasket 6 is located on the opening at the top of the locking sleeve 11. When the connector 1 is installed on the mating head, the sealing gasket 6 can be sandwiched between the bottom end of the mating head and the folded edge 13.

[0035] See Figure 2 , Figure 3 The sealing head 2 is fitted with a retaining member 7. The spring 3 is located between the locking member 41 and the retaining member 7, and its two ends abut against the locking member 41 and the retaining member 7 respectively. A sealing sleeve 71 is sandwiched between the bottom end of the sealing head 2 and the retaining member 7. The sealing sleeve 71 is fitted on the sealing head 2. The maximum diameter of the sealing sleeve 71 is larger than the opening diameter of the bottom end of the connector 1, which ensures the sealing effect of the sealing head 2 on the opening of the bottom end of the connector 1.

[0036] See Figure 3 , Figure 4 The locking member 41 includes a fixing member 81 and a plug member 82. The fixing member 81 is detachably installed in the cavity of the connector 1. The plug member 82 is located between the sealing gasket 6 and the fixing member 81. When the connector 1 is installed on the mating head, the plug member 82 is sandwiched between the sealing gasket 6 and the fixing member 81. The top surface of the fixing member 81 is provided with a plurality of first locking blocks 83 arranged at equal angles around its central axis. The bottom surface of the plug member 82 is provided with second locking blocks 84 corresponding to the first locking blocks 83. A slot 85 is opened between adjacent first locking blocks 83. The second locking block 84 is provided with a plug 86 adapted to the slot 85. When the plug 86 is inserted into the slot 85, the fixing member 81 and the plug member 82 form a through hole 44 and the first locking block 83 and the second locking block 84 form a locking hole 46. By using the modular structure of the locking component 41, the structural integrity of the locking component 41 is ensured, while also facilitating the assembly of the locking block 43 inside the cavity of the locking component 41. This reduces the manufacturing difficulty of the locking component 41 and improves the ease of installation of the locking mechanism 4 inside the locking sleeve 11.

[0037] In this embodiment, the fastener 81 and the connector 1 can be fixed by a snap-fit ​​structure.

[0038] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A normally open and normally closed inflation valve for air conditioning pipeline inflation, characterized in that, include: The connector (1) is a hollow structure with openings at both ends. The top of the connector (1) can be detachably installed on the mating head of the air conditioning pipe. A closing head (2) is used to close the opening at the bottom of the connector (1). The closing head (2) is slidably disposed in the cavity of the connector (1) along the axial direction of the connector (1) and can rotate. A spring (3) is provided between the closing head (2) and the connector (1) to apply a force to the closing head (2) to close the opening at the bottom of the connector (1). The two ends of the spring (3) abut against the closing head (2) and the connector (1) respectively. The cavity of the connector (1) is provided with a locking mechanism (4) for restricting the sliding of the closing head (2) relative to the connector (1). When the connector (1) and the closing head (2) are locked, the closing head (2) does not close the opening at the bottom of the connector (1).

2. The normally open and normally closed air-filling valve for air conditioning pipelines according to claim 1, characterized in that: The locking mechanism (4) includes a locking element (41), which is detachably installed in the cavity of the connector (1). The locking element (41) is a hollow structure with openings at both ends. The top end of the closed head (2) passes through the locking element (41). Several vent holes (42) are provided at equal angles around the central axis of the locking element (41) on both the top and bottom ends of the locking element (41). A locking block (43) is slidably arranged in the cavity of the locking element (41) along its axial direction. The locking block (43) is fixed on the top end of the closed head (2). The cavity of the locking element (41) is divided by the locking block (43). The upper chamber (51) and the lower chamber (52) are formed by partitioning. Several through holes (44) are provided on the side of the locking member (41) and arranged at equal angles around the central axis of the locking member (41). When the closing head (2) does not close the opening at the bottom of the connecting head (1), the upper chamber (51) and the lower chamber (52) can be connected through the through holes (44). The side of the locking block (43) is provided with protrusions (45) that correspond one-to-one with the through holes (44). The side of the locking member (41) is provided with locking holes (46) that are adapted to the protrusions (45). The locking holes (46) are connected to the through holes (44).

3. The normally open and normally closed air-filling valve for air conditioning pipelines according to claim 2, characterized in that: The cavity of the connector (1) is provided with a sealing gasket (6), which is annular. When the connector (1) is installed on the mating head, the sealing gasket (6) is sandwiched between the connector (1) and the mating head.

4. The normally open and normally closed air-filling valve for air conditioning pipelines according to claim 3, characterized in that: The locking member (41) includes a fixing member (81) and a plug-in member (82). The fixing member (81) is detachably installed in the cavity of the connector (1). The plug-in member (82) is located between the sealing gasket (6) and the fixing member (81). When the connector (1) is installed on the mating head, the plug-in member (82) is sandwiched between the sealing gasket (6) and the fixing member (81). The top surface of the fixing member (81) is provided with a plurality of first locking blocks (83) arranged at equal angles around its central axis. (82) has a second card block (84) corresponding to the first card block (83) on its bottom surface. A slot (85) is provided between adjacent first card blocks (83). The second card block (84) has a insert (86) that is compatible with the slot (85). When the insert (86) is inserted into the slot (85), the fixing member (81) and the insert member (82) form a through hole (44) and a locking hole (46) is formed between the first card block (83) and the second card block (84).

5. The normally open and normally closed inflation valve for air conditioning pipeline inflation according to claim 2, characterized in that: The closed head (2) is fitted with a stopper (7), and the spring (3) is located between the locking member (41) and the stopper (7) with its two ends abutting against the locking member (41) and the stopper (7) respectively. A sealing sleeve (71) is sandwiched between the bottom end of the closed head (2) and the stopper (7). The sealing sleeve (71) is fitted on the closed head (2), and the maximum diameter of the sealing sleeve (71) is greater than the opening diameter of the bottom end of the connector (1).

6. The normally open and normally closed air-filling valve for air conditioning pipelines according to claim 1, characterized in that: The connector (1) includes a locking sleeve (11) and a connecting sleeve (12) for detachable connection of the mating head. Both the locking sleeve (11) and the connecting sleeve (12) are hollow structures with openings at both ends. The closed head (2) and the locking mechanism (4) are located in the cavity of the locking sleeve (11). The bottom end of the connecting sleeve (12) is fitted onto the top end of the locking sleeve (11). When the connecting sleeve (12) is connected to the mating head, the top end of the locking sleeve (11) is sandwiched between the bottom end of the connecting sleeve (12) and the mating head.

7. The normally open and normally closed air charging valve for air conditioning pipelines according to claim 6, characterized in that: The top edge of the locking sleeve (11) is folded outward to form a folded edge (13). The connecting sleeve (12) is provided with a limiting part (14) to prevent the top of the locking sleeve (11) from detaching from its bottom end. When the connecting sleeve (12) is connected to the mating head, the folded edge (13) is sandwiched between the bottom end of the mating head and the limiting part (14).

Images