Quantitative liquid adding device for maintenance of central air conditioner

Abstract

The utility model relates to the technical field of central air conditioner maintenance, and discloses a quantitative liquid adding device for central air conditioner maintenance, which comprises a liquid storage cylinder and a cylinder cover, the cylinder cover sleeves the top end of the liquid storage cylinder in a threaded manner, the outer side of the liquid storage cylinder is engraved with scale values, the scale values are arranged from large to small from top to bottom, and the bottom end of the liquid storage cylinder is communicated with a liquid discharge head with a manual valve. A movable rod movably penetrates through the middle of the top end of the barrel cover, a piston is fixedly connected to the bottom end of the movable rod, the edge of the piston is attached to the inner side wall of the liquid storage barrel, a supporting rod is fixedly connected to one end of the top of the barrel cover, and a driving part used for driving the movable rod to ascend and descend is arranged at the bottom end of the supporting rod; a PLC used for controlling the driving part is installed on one side of the supporting rod. According to the scheme, the PLC is used for controlling the driving part to drive the movable rod, so that the movable rod drives the piston to descend, and the piston can push out the refrigerating fluid in the fluid storage cylinder through the fluid drainage head and inject the refrigerating fluid into the central air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of central air-conditioning maintenance, and in particular to a quantitative liquid charger for central air-conditioning maintenance. Background Art

[0002] The central air-conditioning system is composed of one or more cold and heat source systems and multiple air conditioning systems. It adopts the principle of liquid vaporization refrigeration to provide the required cooling capacity for the air conditioning system to offset the heat load of the indoor environment; the heating system provides the required heat for the air conditioning system to offset the cold and warm loads of the indoor environment. The central air-conditioning needs to add refrigerant regularly to ensure that the air-conditioning can have a better cooling effect. Therefore, a liquid charger is used. The current liquid charger is mostly composed of a liquid storage cylinder, a piston rod, and a filling head. When in use, the piston rod is pressed to pressurize the refrigerant in the liquid storage cylinder, so that the refrigerant in the liquid storage cylinder is discharged through the filling head into the container for storing refrigerant inside the central air-conditioning. However, although it achieves the purpose of adding refrigerant, it is impossible to accurately control the amount of refrigerant. Utility Model Content

[0003] In order to solve the above-mentioned problem that the current liquid charger can achieve the purpose of adding refrigerant liquid, but cannot accurately control the amount of refrigerant liquid, the present application provides a quantitative liquid charger for central air conditioning maintenance.

[0004] The quantitative liquid charger for central air conditioning maintenance provided in this application adopts the following technical solution:

[0005] A quantitative liquid dosing device for central air conditioning maintenance comprises a liquid storage cylinder and a cylinder cover, wherein the cylinder cover is threadedly sleeved on the top of the liquid storage cylinder, the outer side of the liquid storage cylinder is engraved with scale values, and the scale values ​​are arranged from large to small from top to bottom, the bottom end of the liquid storage cylinder is connected to a liquid discharge head with a manual valve, a movable rod is movably penetrated through the middle of the top end of the cylinder cover, the bottom end of the movable rod is fixedly connected to a piston, the edge of the piston is in contact with the inner wall of the liquid storage cylinder, one end of the top of the cylinder cover is fixedly connected to a support rod, the bottom end of the support rod is provided with a driving member for driving the movable rod to rise and fall, and one side of the support rod A PLC controller for controlling a driving member is installed, and the PLC controller is electrically connected to an external power supply. A movable ring is movably sleeved on the outer surface of the liquid storage cylinder. Two limit rods are fixedly connected to the outer surface of the liquid storage cylinder. Two sliding grooves are provided on the inner side wall of the movable ring. Three sides of the two limit rods are respectively fitted with the three inner side walls of the two sliding grooves. Screws are threaded through both sides of the movable ring. A resistance rod is fixedly connected to one side of the movable rod. A pressure sensor is fixedly embedded in the bottom end of the resistance rod. The pressure sensor is electrically connected to the input end of the PLC controller.

[0006] Preferably, the driving member is composed of a forward and reverse motor and a one-way threaded rod, the forward and reverse motor is fixedly mounted on the inner top wall of the support rod, the forward and reverse motor is electrically connected to the output end of the PLC controller, one end of the one-way threaded rod is fixedly connected to the end of the power shaft of the forward and reverse motor, and the one-way threaded rod is threadedly inserted into the interior of the movable rod.

[0007] Preferably, a connection block is fixedly connected to the edge of the top end of the liquid storage cylinder, and a gripping rod is fixedly connected to one end of the bottom of the connection block.

[0008] Preferably, the liquid storage cylinder is made of transparent plastic, and the transparent plastic is specifically polyethylene.

[0009] To summarize, the present application includes the following beneficial technical effects: by utilizing the PLC controller to control the driving member to drive the movable rod so that the movable rod drives the piston to descend, the piston can push the refrigerant in the liquid storage cylinder through the discharge head and fill it into the central air conditioner, and at the same time, the movable rod drives the resistance rod to descend synchronously, and the resistance rod drives the pressure sensor to descend at the same time. When the pressure sensor touches the top of the movable ring and transmits the pressure signal to the PLC controller, the PLC controller controls the driving member to stop working, and the driving member cannot push the movable rod and the piston to move downward. At this time, the refrigerant in the liquid storage cylinder will stop being injected into the container for storing refrigerant inside the central air conditioner, and the purpose of accurately and quantitatively filling the refrigerant is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the application.

[0011] Figure 2 It is a side view structural schematic diagram of an application embodiment.

[0012] Figure 3 Schematic diagram of the cross-sectional structure of the embodiment of the application

[0013] Explanation of the reference numerals: 11. Liquid storage cylinder; 12. Cylinder cover; 13. Liquid discharge head; 14. Movable rod; 15. Piston; 21. Support rod; 22. Limit rod; 23. Movable ring; 24. Screw; 25. Resistance rod; 26. Pressure sensor; 3. Driving part; 31. Forward and reverse motor; 32. One-way threaded rod; 4. PLC controller; 51. Connecting block; 52. Grip rod. DETAILED DESCRIPTION

[0014] The following is combined with Figure 1-3 This application is described in further detail.

[0015] The present application embodiment discloses a quantitative liquid charger for central air conditioner maintenance, referring to Figure 1-3, including a liquid storage cylinder 11 and a cylinder cover 12. The cylinder cover 12 is threadedly sleeved on the top of the liquid storage cylinder 11 to close the top of the liquid storage cylinder 11, and the liquid storage cylinder 11 is used to store refrigerant. The outer side of the liquid storage cylinder 11 is engraved with scale values, and the scale values ​​are arranged from large to small from top to bottom. The bottom end of the liquid storage cylinder 11 is connected to a liquid discharge head 13 with a manual valve. Closing the valve of the liquid discharge head 13 can prevent the refrigerant from easily running out of the liquid discharge head 13. An active rod 14 is movably penetrated in the middle of the top of the cylinder cover 12. A piston 15 is fixedly connected to the bottom end of the active rod 14. The edge of the piston 15 is in contact with the inner wall of the liquid storage cylinder 11. One end of the top of the cylinder cover 12 is fixedly connected to a support rod 21. The bottom end of the support rod 21 is provided with a valve for driving the active rod 14. A driving member 3 for lifting and lowering is provided with a PLC controller 4 for controlling the driving member 3 on one side of the support rod 21, and the PLC controller 4 is electrically connected to an external power supply. The driving member 3 is composed of a forward and reverse motor 31 and a one-way threaded rod 32. The forward and reverse motor 31 is fixedly installed on the inner top wall of the support rod 21, and the forward and reverse motor 31 is electrically connected to the output end of the PLC controller 4. One end of the one-way threaded rod 32 is fixedly connected to the end of the power shaft of the forward and reverse motor 31, and the one-way threaded rod 32 is threadedly inserted into the inside of the movable rod 14. After the control program is set in the PLC controller 4, the valve of the discharge head 13 is opened at the same time, and the forward and reverse motor 31 is controlled by the PLC controller 4 to start working, and the power shaft of the forward and reverse motor 31 will The one-way threaded rod 32 is driven to rotate. During the rotation process, the one-way threaded rod 32 applies a spiral thrust to the movable rod 14, so that the movable rod 14 drives the piston 15 to descend, and the piston 15 can push the refrigerant in the liquid storage cylinder 11 through the liquid discharge head 13 and add it to the container for storing refrigerant in the central air conditioner. The outer surface of the liquid storage cylinder 11 is movably sleeved with a movable ring 23. The outer surface of the liquid storage cylinder 11 is fixedly connected with two limit rods 22. The inner side wall of the movable ring 23 is provided with two slide grooves. Three sides of the two limit rods 22 are respectively fitted with the three inner side walls of the two slide grooves, so that the limit rods 22 can continue to maintain a horizontal state. Screws 24 are threaded through both sides of the movable ring 23. A resistance rod 25 is fixedly connected to one side of the movable rod 14. A pressure sensor 26 is fixedly embedded at the bottom end of the resistance rod 25, and the bottom end of the pressure sensor 26 is at the same horizontal plane as the bottom end surface of the piston 15. The pressure sensor 26 is electrically connected to the input end of the PLC controller 4. When the central air conditioner needs to be filled with refrigerant, if the amount added is quantitative, the scale value on the liquid storage cylinder 11 that is the same as the quantitative value can be referred to, and the height of the movable ring 23 can be adjusted so that the top surface of the movable ring 23 corresponds to the scale value on the liquid storage cylinder 11 that is the same as the quantitative value, and then the two screws 24 are rotated so that the two screws 24 are tightly in contact with the two limit rods 22, thereby fixing the movable ring 23. Then, when the movable rod 14 drives the piston 15 to descend, the movable rod 14 drives the resistance rod 25 to descend synchronously.The resistance rod 25 drives the pressure sensor 26 to descend at the same time. When the pressure sensor 26 touches the top of the movable ring 23 and transmits the pressure signal to the PLC controller 4, the PLC controller 4 controls the forward and reverse motor 31 to stop working, and the one-way threaded rod 32 stops rotating and cannot push the movable rod 14 and the piston 15 to move downward. At this time, the refrigerant in the liquid storage cylinder 11 stops being injected into the refrigerant storage container inside the central air conditioner, and the purpose of accurately and quantitatively filling the refrigerant is achieved.

[0016] Reference Figure 1 and Figure 2 A connecting block 51 is fixedly connected to the edge of the top of the liquid storage cylinder 11, and a gripping rod 52 is fixedly connected to one end of the bottom of the connecting block 51. The connecting block 51 can connect the gripping rod 52 and the liquid storage cylinder 11, and holding the gripping rod 52 makes it convenient to move the liquid storage cylinder 11.

[0017] Reference Figure 1 and Figure 2 The liquid storage cylinder 11 is made of transparent plastic, and the transparent plastic is specifically polyethylene. Polyethylene is not only transparent so that the condition of the refrigerant inside the liquid storage cylinder 11 can be seen, but also has high hardness and is not easy to be damaged.

[0018] The implementation principle of the quantitative liquid charger for central air conditioner maintenance in the embodiment of the present application is as follows: when in use, after the control program is set in the PLC controller 4, the valve of the liquid discharge head 13 is opened at the same time, and the forward and reverse motor 31 is controlled by the PLC controller 4 to start working, and the power shaft of the forward and reverse motor 31 drives the one-way threaded rod 32 to rotate. During the rotation process, the one-way threaded rod 32 applies a spiral thrust to the movable rod 14, so that the movable rod 14 drives the piston 15 to descend, and the piston 15 can push the refrigerant in the liquid storage cylinder 11 through the liquid discharge head 13 and discharge it to the internal refrigeration of the central air conditioner. The movable rod 14 drives the resistance rod 25 to descend synchronously, and the resistance rod 25 drives the pressure sensor 26 to descend simultaneously. When the pressure sensor 26 touches the top of the movable ring 23 and transmits the pressure signal to the PLC controller 4, the PLC controller 4 controls the forward and reverse motor 31 to stop working, and the one-way threaded rod 32 stops rotating and cannot push the movable rod 14 and the piston 15 to move downward. At this time, the refrigerant in the liquid storage cylinder 11 stops being injected into the refrigerant storage container inside the central air conditioner, and the purpose of accurately and quantitatively filling the refrigerant is achieved.

[0019] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0020] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0021] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

[0022] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A quantitative liquid dosing device for central air conditioning maintenance, comprising a liquid storage cylinder (11) and a cylinder cover (12), characterized in that: The cylinder cover (12) is threadedly sleeved on the top of the liquid storage cylinder (11), and the outer side of the liquid storage cylinder (11) is engraved with scale values, and the scale values ​​are arranged from large to small from top to bottom. The bottom end of the liquid storage cylinder (11) is connected to a liquid discharge head (13) provided with a manual valve. A movable rod (14) is movably penetrated through the middle of the top of the cylinder cover (12), and the bottom end of the movable rod (14) is fixedly connected to a piston (15), and the edge of the piston (15) is in contact with the inner wall of the liquid storage cylinder (11). One end of the top of the cylinder cover (12) is fixedly connected to a support rod (21), and the bottom end of the support rod (21) is provided with a driving member (3) for driving the movable rod (14) to rise and fall, and one side of the support rod (21) is provided with a driving member (3) for driving the driving member (3) to rise and fall. ) is used for controlling a PLC controller (4), and the PLC controller (4) is electrically connected to an external power supply. The outer surface of the liquid storage cylinder (11) is movably sleeved with a movable ring (23). The outer surface of the liquid storage cylinder (11) is fixedly connected with two limit rods (22). The inner side wall of the movable ring (23) is provided with two slide grooves. Three sides of the two limit rods (22) are respectively fitted with three inner side walls of the two slide grooves. Screws (24) are threaded through both sides of the movable ring (23). One side of the movable rod (14) is fixedly connected with a resistance rod (25). The bottom end of the resistance rod (25) is fixedly embedded with a pressure sensor (26). The pressure sensor (26) is electrically connected to the input end of the PLC controller (4).

2. A quantitative liquid charger for central air conditioning maintenance according to claim 1, characterized in that: The driving member (3) is composed of a forward and reverse motor (31) and a one-way threaded rod (32); the forward and reverse motor (31) is fixedly mounted on the inner top wall of the support rod (21); the forward and reverse motor (31) is electrically connected to the output end of the PLC controller (4); one end of the one-way threaded rod (32) is fixedly connected to the end of the power shaft of the forward and reverse motor (31); and the one-way threaded rod (32) is threadedly inserted into the interior of the movable rod (14).

3. A quantitative liquid charger for central air conditioning maintenance according to claim 1, characterized in that: A connection block (51) is fixedly connected to the edge of the top end of the liquid storage cylinder (11), and a gripping rod (52) is fixedly connected to one end of the bottom end of the connection block (51).

4. A quantitative liquid charger for central air conditioning maintenance according to claim 1, characterized in that: The liquid storage cylinder (11) is made of transparent plastic, and the transparent plastic is specifically polyethylene.

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