CN215260666U

CN215260666U - Refrigerant filling device of air conditioner

Info

Publication number: CN215260666U
Application number: CN202121531075.4U
Authority: CN
Inventors: 陈城彬; 张先雄; 霍强伟
Original assignee: Ningbo Kanghanrui Electric Appliance Co ltd
Current assignee: Ningbo Kanghanrui Electric Appliance Co ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-12-21
Anticipated expiration: 2031-07-06

Abstract

The utility model discloses a refrigerant filling device of an air conditioner, which comprises a filling seat, wherein a refrigerant cavity and a main cavity which are communicated with each other are arranged in the filling seat, a refrigerant filling port is arranged on the refrigerant cavity, a refrigerant outlet is arranged on the main cavity, a driving piece which is arranged on the main cavity is movably arranged on the filling seat, a first sealing element is arranged on the driving piece, and a first sealing surface is arranged on the inner wall of the main cavity; the driving piece movably controls the first sealing piece and the first sealing surface to be arranged in a sealing mode so as to divide the main cavity into a first cavity and a second cavity which are not communicated with each other, and the first cavity is communicated with the refrigerant cavity. Install on the stop valve filling the refrigerant exit of annotating the seat, install the hose on filling the refrigerant mouth, remove the valve inside thimble of top in the stop valve through the drive driving piece for refrigerant cavity, main cavity and stop valve communicate in proper order, fill into the refrigerant in to the stop valve through filling the refrigerant mouth, before adding the refrigerant and fill the notes in-process, the refrigerant in stop valve and the refrigerant bottle is difficult for spilling, can not freeze the hand of hindering.

Description

Refrigerant filling device of air conditioner

Technical Field

The utility model relates to an air conditioner technical field, concretely relates to refrigerant filling device of air conditioner.

Background

The refrigerant is a working substance that continuously circulates in the refrigeration system and realizes refrigeration. Since the refrigerant leaks during the long-term operation of the air conditioner, the function of the air conditioner is affected in the case of insufficient refrigerant, and the refrigerant needs to be filled at this time. In the process of adding the refrigerant, the hose connector of the refrigerant is directly screwed on the fluorine injection nozzle of the stop valve, so that the refrigerant of the system is easy to leak, and the refrigerant in the refrigerant bottle can freeze hands if the refrigerant leaks before the hose connector is not screwed down.

SUMMERY OF THE UTILITY MODEL

In view of the above analysis, the present invention provides a refrigerant charging device for an air conditioner to overcome the shortcomings of the prior art.

The utility model discloses mainly realize through following technical scheme:

the utility model provides a refrigerant filling device of air conditioner, including filling the notes seat, be equipped with the refrigerant cavity and the main cavity of intercommunication in filling the seat, be equipped with on the refrigerant cavity and fill the refrigerant mouth, be equipped with the refrigerant export on the main cavity, fill the movable driving piece that holds on the main cavity that is equipped with of notes seat, be equipped with first sealing member on the driving piece, be equipped with first sealed face on the inner wall of main cavity; the driving piece movably controls the first sealing piece and the first sealing surface to be arranged in a sealing mode so as to divide the main cavity into a first cavity and a second cavity which are not communicated with each other, and the first cavity is communicated with the refrigerant cavity.

Further, still be equipped with the pressure regulation chamber with the refrigerant cavity intercommunication in filling and annotating the seat, be equipped with the gas vent with main cavity intercommunication on the pressure regulation chamber, the gas vent is located between first sealed face and the refrigerant export, movable mounting has the pressure restriction spare that is used for blocking or communicates refrigerant cavity and main cavity on the pressure regulation chamber, the pressure restriction spare sets up with the inner wall cooperation seal of pressure regulation chamber.

Furthermore, an elastic piece abutting against the pressure limiting piece is arranged on the filling seat, and the elastic piece is arranged away from the exhaust port.

Furthermore, a connecting piece is arranged on the filling seat, a third cavity is arranged in the connecting piece, a first connecting end of the connecting piece is connected with the filling seat in a sealing mode, a second connecting end of the connecting piece is provided with a first opening, the driving piece penetrates through the connecting piece and is arranged in the third cavity, and the third cavity is communicated with the main cavity.

Furthermore, a sealing joint is mounted on the connecting piece, a fourth cavity is arranged in the sealing joint, a first connecting end of the sealing joint is connected with the filling seat in a sealing mode, a second connecting end of the sealing joint is provided with a second opening, the sealing joint penetrates through the connecting piece and is arranged in the third cavity, the driving piece penetrates through the sealing joint and is arranged in the fourth cavity, a gap exists between the driving piece and the inner wall of the sealing joint, and the fourth cavity is communicated with the main cavity.

Furthermore, the pressure regulating cavity and the pressure limiting part are arranged by penetrating through the refrigerant cavity, and a first through hole communicated with the refrigerant cavity is movably arranged on the pressure limiting part.

Furthermore, a limiting part is installed in the refrigerant cavity, and the elastic part is arranged between the limiting part and the pressure limiting part.

Furthermore, a sealing ring is arranged on the first sealing element, and a second sealing surface matched and sealed with the first sealing surface is arranged on the sealing ring.

Further, the outer wall of the driving piece is provided with stepping threads, the inner wall of the main cavity is provided with pushing threads, and the pushing threads are engaged with the stepping threads in a matched mode.

Further, the sealing joint is in threaded connection with the filling seat.

Compared with the prior art the utility model discloses technical scheme's beneficial effect does:

the utility model provides a refrigerant filling device of air conditioner will fill the refrigerant exit of annotating the seat and install on the stop valve, install the hose on filling the refrigerant mouth, remove the valve core thimble in the top-actuated stop valve through the drive driving piece for refrigerant cavity, main cavity and stop valve communicate in proper order, fill into the refrigerant in to the stop valve through filling the refrigerant mouth, and fill the notes in-process before adding the refrigerant, the refrigerant in stop valve and the refrigerant bottle is difficult for spilling, can not freeze the hand of hindering.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of a refrigerant charging device of an air conditioner according to an embodiment of the present invention, installed on a stop valve before charging;

fig. 2 is a schematic structural view of a refrigerant charging device of an air conditioner according to an embodiment of the present invention installed on a stop valve during charging;

fig. 3 is a schematic structural view illustrating a refrigerant filling device of an air conditioner according to an embodiment of the present invention installed on a stop valve when the refrigerant filling device is saturated;

fig. 4 is a schematic structural diagram of a refrigerant charging device of an air conditioner according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a pressure limiting member according to an embodiment of the present invention.

The reference numbers are as follows:

1. the refrigerant charging device comprises a charging seat, a first sealing surface, a second sealing surface, a gas outlet, an 11, a refrigerant cavity, a 11a, a refrigerant charging port, a 12, a main cavity, a 12a, a refrigerant outlet, a 121, a first cavity, a 122, a second cavity, a 13, a pressure adjusting cavity, a 2, a driving part, a 21, a first sealing part, a 22, a rotating disc, a 3, a pressure limiting part, a 3a, a first through hole, a 4, an elastic part, a 5, a connecting part, a 5a, a third cavity, a 5b, a first opening, a 6, a sealing joint, a 6a, a fourth cavity, a 6b, a second opening, a 7, a limiting part, 8, a sealing ring, 8a, a second sealing surface, 9, a sealing part, a 20, a stop valve, 20a, a refrigerant channel, 20b, a main channel, 20c, a refrigerant inlet, a 30, a valve core, a thimble, a 40 and a connecting pipe.

Detailed Description

In order to better understand the invention for those skilled in the art and to define the claimed scope more clearly, the invention will be described in detail below with respect to certain specific embodiments of the invention. It should be noted that the following description is only a few examples of the present invention, and the specific and direct descriptions of the related structures are only for the convenience of understanding the present invention, and the specific features do not naturally and directly limit the scope of the present invention. Conventional alternatives and substitutions made by those skilled in the art in light of the teachings of the present disclosure should be considered as within the scope of the present disclosure.

The invention will be further explained with reference to the drawings and the specific embodiments.

Example 1

As shown in fig. 1-4, a refrigerant filling device of an air conditioner includes a filling seat 1, a refrigerant cavity 11 and a main cavity 12 are arranged in the filling seat 1, the refrigerant cavity 11 is provided with a refrigerant filling port 11a, the main cavity 12 is provided with a refrigerant outlet 12a, the filling seat 1 is movably provided with a driving member 2 accommodated in the main cavity 12, the driving member 2 is provided with a first sealing member 21, and the inner wall of the main cavity 12 is provided with a first sealing surface 1 a; the driving member 2 movably controls the first sealing member 21 to be arranged in a sealing manner with the first sealing surface 1a, so as to divide the main cavity 12 into a first cavity 121 and a second cavity 122 which are not communicated with each other, and the first cavity 121 is communicated with the refrigerant cavity 11. Wherein the driving member 2 is arranged through the charging seat 1. The outer wall of the filling seat 1 close to the refrigerant filling opening 11a is provided with threads, and the hose is installed on the refrigerant filling opening 11 a.

Specifically, the air conditioner includes a stop valve 20, an end portion of the charging seat 1 close to the refrigerant outlet 12a is hermetically installed on the stop valve 20, a refrigerant passage 20a and a main passage 20b which are communicated with each other are provided in the stop valve 20, a refrigerant inlet 20c is provided at an end portion of the refrigerant passage 20a, a valve core 30 is installed in the refrigerant passage 20a to block or communicate the refrigerant inlet 20c and the refrigerant passage 20a, and a connection pipe 40 is provided on the main passage 20 b. The driving member 2 moves to make the first sealing member 21 separate from the first sealing surface 1a, the second cavity 122 is communicated with the refrigerant cavity 11, and the driving member 2 is matched and abutted with the thimble 30a of the valve core 30 to communicate the refrigerant inlet 20c with the refrigerant channel 20 a; the driving member 2 moves in the opposite direction so that the first sealing member 21 is tightly attached to the first sealing surface 1a, the second cavity 122 is disconnected from the refrigerant cavity 11, and the end of the driving member 2 is away from the needle 30a of the valve core 30 to block the refrigerant inlet 20c and the refrigerant passage 20 a.

Preferably, the valve core 30 is provided with a through hole, the thimble 30a is provided with a sealing portion, the sealing portion is provided with a sealing gasket, the thimble 30a is sleeved with a spring abutting against the inner wall of the through hole, and the middle portion of the outer wall of the valve core 30 is provided with a sealing conical surface sealing with the inner wall of the refrigerant channel 20 a. When no external force is applied to the thimble 30a, the sealing gasket on the sealing portion blocks the through hole, and when an external force is applied to the left side of the thimble 30a, the sealing gasket on the sealing portion is away from the through hole to communicate the refrigerant inlet 20c with the refrigerant passage 20 a.

Further, the valve core 30 is screwed with the stop valve 20.

Specifically, a sealing ring 8 is arranged on the first sealing element 21, and a second sealing surface 8a which is matched and sealed with the first sealing surface 1a is arranged on the sealing ring 8.

Preferably, the second sealing surface 8a is a conical surface and the first sealing surface 1a is a reverse conical surface.

Specifically, the charging seat 1 is a T-shaped cylinder, a refrigerant cavity 11 is arranged on the vertical extending portion, a main cavity 12 and a pressure adjusting cavity 13 are arranged on the horizontal extending portion at intervals in parallel, the main cavity 12 is vertically communicated with the refrigerant cavity 11, the pressure adjusting cavity 13 is vertically intersected with the refrigerant cavity 11, and the inner diameter of the refrigerant cavity 11 is smaller than that of the main cavity 12.

The inner diameter of the second cavity 122 is greater than the inner diameter of the first cavity 121, and a reverse tapered surface is disposed at a joint between the second cavity and the first cavity, and the reverse tapered surface is located on the right side of the refrigerant cavity 11.

Specifically, the outer wall of the driving member 2 is provided with a stepping thread, and the inner wall of the main cavity 12 is provided with a pushing thread which is engaged with the stepping thread in a matching manner. The driving member 2 is locked while generating horizontal displacement, so that the driving member 2 is prevented from moving under the pressure of the spring of the thimble 30a and the refrigerant filling.

Preferably, the drive member 2 is provided with a rotating disc 22 located outside the filling shoe 1. The operation of the driver 2 is facilitated.

Wherein, a sealing ring is arranged between the driving part 2 and the inner wall of the left end of the main cavity 12. The driving part 2 is a driving rod, the driving rod penetrates through the charging seat 1 to be in threaded connection with the rotating disk 22, the outer diameter of the driving rod is smaller than the inner diameter of the main cavity 12, a stepping thread is arranged in the middle of the left end of the driving rod and is meshed with a propelling thread in the main cavity 12, the driving rod is driven to rotate and generate horizontal displacement through the rotation of the rotating disk 22, and when the sealing ring 8 of the driving rod seals the left side and the right side of the main cavity 12, the refrigerant cavity 11 is isolated from the second cavity 122.

As shown in fig. 5, preferably, a pressure regulating chamber 13 communicated with the refrigerant cavity 11 is further disposed in the charging seat 1, an exhaust port 1b communicated with the main cavity 12 is disposed on the pressure regulating chamber 13, the exhaust port 1b is located between the first sealing surface 1a and the refrigerant outlet 12a, a pressure limiting member 3 for blocking or communicating the refrigerant cavity 11 and the main cavity 12 is movably mounted on the pressure regulating chamber 13, and the pressure limiting member 3 is in sealing arrangement with an inner wall of the pressure regulating chamber 13 in a matching manner.

Specifically, the pressure regulating cavity 13 and the pressure limiting part 3 both penetrate through the refrigerant cavity 11, and the pressure limiting part 3 is movably provided with a first through hole 3a communicated with the refrigerant cavity 11.

Preferably, the pressure limiting member 3 is a cylindrical pressure rod, a sealing ring is arranged between each of two ends of the pressure rod and the inner wall of the pressure adjusting cavity 13, and the sealing ring is in interference fit with the pressure adjusting cavity 13, so that each of two ends of the pressure rod is hermetically arranged on the inner wall of the pressure adjusting cavity 13. Wherein, the first through hole 3a can be arranged one or more at intervals in the circumferential direction of the pressure rod, and the plurality of first through holes 3a are communicated with each other to facilitate the assembly.

Further, a limiting step matched with the pressure limiting part 3 for limiting is arranged in the pressure adjusting cavity 13, and the limiting step is arranged close to the exhaust port 1b, so that the first through hole 3a is aligned with the refrigerant cavity 11.

Specifically, the charging seat 1 is provided with an elastic member 4 abutting against the pressure limiting member 3, and the elastic member 4 is arranged away from the exhaust port 1 b. The elastic member 4 is a spring, and the elastic force of the spring is set according to the pressure of the normal operation of the air conditioner system.

Preferably, the limiting member 7 is installed in the refrigerant cavity 11, and the elastic member 4 is disposed between the limiting member 7 and the pressure limiting member 3.

Wherein, the limiting part 7 is a stop-back ring, and the left end of the pressure adjusting cavity 13 is provided with a stop-back ring mounting groove. The right end of the main cavity 12 is provided with an exhaust port 1 b.

One end of the pressure limiting part 3 is driven by the elastic part 4 to move, so that the first through hole 3a is communicated with the refrigerant cavity 11, the refrigerant part entering the second cavity 122 enters the exhaust port 1b, when the refrigerant is filled with a certain amount, the other end of the pressure limiting part 3 compresses the elastic part 4 under the driving of the refrigerant, so that the first through hole 3a moves, the refrigerant cavity 11 is cut off until the pressure limiting part 3, thereby preventing the system pressure from being too high due to the fact that the system refrigerant is added too much, causing the air conditioner to operate and adjust the machine, and the pressure limiting part 3 can block the refrigerant cavity 11 only when the system pressure reaches a proper range, avoiding the refrigerant being added less, and ensuring the refrigerant flow of the air conditioner.

Preferably, the filling seat 1 is provided with a connecting piece 5, a third cavity 5a is arranged in the connecting piece 5, the first connecting end of the connecting piece 5 is connected with the filling seat 1 in a sealing manner, the second connecting end of the connecting piece 5 is provided with a first opening 5b, the driving piece 2 penetrates through the connecting piece 5 and is arranged in the third cavity 5a, and the third cavity 5a is communicated with the main cavity 12. Wherein, connecting piece 5 is cylindrical sleeve, and the one end of connecting piece 5 is equipped with central through-hole, and the other end of connecting piece 5 opens to set up and forms first opening 5b, and the inner wall of first opening 5b department is equipped with fixed screw, connecting piece 5 and stop valve 20 threaded connection.

Specifically, install sealing joint 6 on the connecting piece 5, be equipped with fourth cavity 6a in the sealing joint 6, sealing joint 6's first link with fill notes seat 1 sealing connection, sealing joint 6's second link is equipped with second opening 6b, sealing joint 6 passes connecting piece 5 and sets up in third cavity 5a, driving piece 2 passes sealing joint 6 and sets up in fourth cavity 6a, there is the clearance between driving piece 2 and the inner wall of sealing joint 6, fourth cavity 6a and main cavity 12 intercommunication to improve connecting piece 5 and fill the sealing performance between the notes seat 1.

Preferably, there is a space between the outer wall of the sealing nipple 6 and the central through hole, the sealing nipple 6 being slidably mounted on the connecting piece 5.

Specifically, a sealing piece 9 is arranged in the sealing joint 6, the end part of the sealing piece 9 is abutted against the refrigerant inlet 20c, and the outer wall of the sealing piece 9 is closely attached to the inner wall of the fourth cavity 6 a. The sealing element 9 is a sealing ring having a gap with the outer wall of the driving element 2, so that the refrigerant can pass through the sealing ring conveniently.

Preferably, a retaining ring is arranged on the outer wall of the sealing joint 6, and the retaining ring and the refrigerant outlet 12a are arranged in a sealing manner through a sealing ring. The sealing joint 6 is in threaded connection with the filling seat 1.

Sealing joint 6's middle part is the connecting portion of being connected with connecting piece 5 central through-hole, sealing joint 6's one end is equipped with fixed screw, the retaining ring sets up between fixed screw and connecting portion, set up sealing member 9 in sealing joint 6's the other end, the external diameter at sealing joint 6 both ends all is greater than the external diameter of connecting portion, in order to all form the drop fender face at the junction at connecting portion and both ends respectively, it is spacing to sealing joint 6, make sealing joint 6's left end with fill when annotating 1 threaded connection, sealing joint 6's middle part is spacing on the drop fender face, avoid sealing joint 6's right-hand member to deviate from connecting piece 5's central through-hole.

During installation, one end of the driving rod is inserted into the left end from the right end of the main cavity 12, the stepping threads of the driving rod are screwed onto the propelling threads of the filling seat 1 and enable the driving rod to penetrate out of the filling seat 1, a sealing ring is installed at the left end of the main cavity 12 to seal the driving rod with the main cavity 12, and a first sealing surface 1a at the right end of the main cavity 12 is sealed with a sealing ring 8 on the driving rod. The rotary disk 22 is installed at the left end of the driving rod, the sealing joint 6 is inserted into the central through hole of the connecting member 5, and then the left end of the sealing joint 6 is installed on the fixing thread at the right end of the main cavity 12. When the assembly is in place, the retainer ring of the sealing joint 6 is tightly attached to the sealing ring at the right end of the main cavity 12 for sealing. The pressure rod is inserted into the pressure adjusting cavity 13, the spring is installed, when the pressure at the right end of the pressure adjusting cavity 13 is higher than the normal operation pressure, the pressure rod is pushed leftwards to enable the first through hole 3a of the pressure rod to be located on the left side of the refrigerant cavity 11, the refrigerant cavity 11 is blocked by the pressure rod at the moment, and the refrigerant cannot enter the system through the refrigerant cavity 11.

When the refrigerant needs to be filled, the hose of the refrigerant bottle is firstly installed at the refrigerant filling port 11a of the filling seat 1, the rotating rotary disk 22 enables the driving rod to rotate and generate horizontal displacement rightward, the sealing ring 8 on the driving rod is separated from the first sealing surface 1a, then the refrigerant of the refrigerant bottle is opened, the hose and the air in the filling seat 1 are discharged, then the rotating rotary disk 22 rotates the driving rod and generates horizontal displacement leftward, the sealing ring 8 on the driving rod is tightly attached to the first sealing surface 1a to block the first cavity 121 and the second cavity 122, and at the moment, the refrigerant cavity 11 is isolated from the second cavity 122. The connector 5 is then fitted to the external thread of the stop valve 20, and when fitted in place, the seal 9 of the sealing joint 6 abuts against the end of the refrigerant inlet 20c to seal it, rotating the drive rod out of contact with the needle 30a of the valve core 30.

When the rotary disc 22 is rotated to make the driving rod generate horizontal displacement rightward, the sealing ring 8 is separated from the first sealing surface 1a, so that the first cavity 121 is communicated with the second cavity 122, when the rotary disc is mounted in place, the right end of the driving rod jacks the thimble 30a rightward, the refrigerant inlet 20c is communicated with the refrigerant channel 20a, and the refrigerant enters the system through the refrigerant channel 20a and the main channel 20b of the stop valve 20. With the supplement of the refrigerant, the system pressure at the refrigerant inlet 20c of the stop valve 20 increases, and when the system pressure reaches the normal pressure range, the right end of the pressure rod pushes the pressure rod to the left end under the action of the system pressure, so that the refrigerant cavity 11 is blocked by the pressure rod. After the refrigerant is completely added, the rotating disc 22 only needs to be rotated, so that the sealing ring 8 on the driving rod is tightly attached to the first sealing surface 1a to realize the sealing of the first cavity 121 and the second cavity 122. At this time, the thimble 30a of the stop valve 20 slides leftward by the spring force, so that the refrigerant inlet 20c is blocked from the refrigerant passage 20a, thereby preventing the system refrigerant from flowing out. Then, the valve of the refrigerant bottle is closed, no refrigerant in the refrigerant bottle enters the second cavity 122 at this time, and the connecting member 5 is only required to be unscrewed from the stop valve 20.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The refrigerant charging device of the air conditioner is characterized in that: the filling and injecting device comprises a filling and injecting seat (1), wherein a refrigerant cavity (11) and a main cavity (12) which are communicated with each other are arranged in the filling and injecting seat (1), a refrigerant filling port (11a) is formed in the refrigerant cavity (11), a refrigerant outlet (12a) is formed in the main cavity (12), a driving piece (2) which is accommodated in the main cavity (12) is movably arranged on the filling and injecting seat (1), a first sealing piece (21) is arranged on the driving piece (2), and a first sealing surface (1a) is arranged on the inner wall of the main cavity (12); the driving piece (2) movably controls the first sealing piece (21) and the first sealing surface (1a) to be arranged in a sealing mode, so that the main cavity (12) is divided into a first cavity (121) and a second cavity (122) which are not communicated with each other, and the first cavity (121) is communicated with the refrigerant cavity (11).

2. The refrigerant charging device of an air conditioner as claimed in claim 1, wherein: still be equipped with pressure regulation chamber (13) with refrigerant cavity (11) intercommunication in filling notes seat (1), be equipped with gas vent (1b) with main cavity (12) intercommunication on pressure regulation chamber (13), gas vent (1b) are located between first sealed face (1a) and refrigerant export (12a), movable mounting has pressure restriction spare (3) that are used for blocking or communicate refrigerant cavity (11) and main cavity (12) on pressure regulation chamber (13), pressure restriction spare (3) and the sealed setting of inner wall cooperation of pressure regulation chamber (13).

3. The refrigerant charging device of an air conditioner as claimed in claim 2, wherein: the charging seat (1) is provided with an elastic part (4) which is abutted against the pressure limiting part (3), and the elastic part (4) deviates from the exhaust port (1 b).

4. A refrigerant charging device of an air conditioner according to claim 1 or 2, wherein: the filling and injecting seat is characterized in that a connecting piece (5) is arranged on the filling and injecting seat (1), a third cavity (5a) is arranged in the connecting piece (5), a first connecting end of the connecting piece (5) is connected with the filling and injecting seat (1) in a sealing mode, a second connecting end of the connecting piece (5) is provided with a first opening (5b), the driving piece (2) penetrates through the connecting piece (5) to be arranged in the third cavity (5a), and the third cavity (5a) is communicated with the main cavity (12).

5. The refrigerant charging device of an air conditioner as claimed in claim 4, wherein: the filling device is characterized in that a sealing joint (6) is installed on the connecting piece (5), a fourth cavity (6a) is arranged in the sealing joint (6), a first connecting end of the sealing joint (6) is connected with the filling seat (1) in a sealing mode, a second connecting end of the sealing joint (6) is provided with a second opening (6b), the sealing joint (6) penetrates through the connecting piece (5) to be arranged in the third cavity (5a), the driving piece (2) penetrates through the sealing joint (6) to be arranged in the fourth cavity (6a), a gap exists between the driving piece (2) and the inner wall of the sealing joint (6), and the fourth cavity (6a) is communicated with the main cavity (12).

6. A refrigerant charging device of an air conditioner according to claim 3, wherein: the pressure regulating cavity (13) and the pressure limiting part (3) are arranged by penetrating through the refrigerant cavity (11), and the pressure limiting part (3) is movably provided with a first through hole (3a) communicated with the refrigerant cavity (11).

7. The refrigerant charging device of an air conditioner as claimed in claim 6, wherein: a limiting piece (7) is installed in the refrigerant cavity (11), and the elastic piece (4) is arranged between the limiting piece (7) and the pressure limiting piece (3).

8. The refrigerant charging device of an air conditioner as claimed in claim 1, wherein: and a sealing ring (8) is arranged on the first sealing element (21), and a second sealing surface (8a) which is matched and sealed with the first sealing surface (1a) is arranged on the sealing ring (8).

9. The refrigerant charging device of an air conditioner as claimed in claim 1, wherein: the outer wall of the driving piece (2) is provided with stepping threads, the inner wall of the main cavity (12) is provided with propelling threads, and the propelling threads are engaged with the stepping threads in a matched mode.

10. The refrigerant charging device of an air conditioner as claimed in claim 5, wherein: the sealing joint (6) is in threaded connection with the filling seat (1).