Refrigerant recovery and dispensing machine

Abstract

The application discloses a refrigerant recycling and filling machine, which comprises a refrigerant recycling and filling machine body and an external filtering device. The external filtering device comprises a shell, a partition plate arranged in the middle of the shell, a cylindrical filter with an annular filter screen on the circumferential side and rotatably connected to the partition plate at the lower end, a pressing type rotating mechanism arranged between the shell and the upper end of the cylindrical filter, and a bristle assembly arranged on the inner side of the shell and abutting against the surface of the cylindrical filter. An annular groove is formed between the upper surface edge of the partition plate and the shell. The application has the following advantages and effects: during the use of the refrigerant recycling and filling machine, the cylindrical filter is driven to rotate by the pressing type rotating mechanism, the bristle assembly removes the impurities attached to the circumferential side of the cylindrical filter during the rotation of the cylindrical filter, the removed impurities are accumulated in the annular groove, and finally the surface impurities of the cylindrical filter are removed, thereby prolonging the replacement cycle of the cylindrical filter.

Description

Technical Field

[0001] This invention relates to the field of refrigerant treatment technology, and in particular to a refrigerant recovery and refueling machine. Background Technology

[0002] The refrigerant recovery and charging machine is a multi-functional machine integrating refrigerant recovery, regeneration, charging, leak detection, vacuuming, and refrigerant oil charging. Refrigerant Recovery: Utilizing an internal compression and filtration device, the machine recovers refrigerant from the air conditioning pipes into the working tank. Refrigerant Regeneration: Separates refrigerant oil and water from the air conditioning system, meeting reuse standards and ensuring refrigerant purity, thus enabling refrigerant recycling. Refrigerant Charging: Sets the refrigerant charge amount and adds the corresponding amount of the same type of refrigerant to the vehicle. Leak Detection: Detects leaks in the air conditioning refrigerant pipes, ensuring good sealing. Vacuuming: Vacuums the air conditioning pipes and equipment piping. Refrigerant Oil Charging: Sets the refrigerant oil amount and adds refrigerant oil to the air conditioning system.

[0003] For example, Chinese patent with authorization announcement number CN217900239U and authorization announcement date of November 25, 2022 discloses an external filter device for a refrigerant recovery and refueling machine. By setting an external filter device, it is convenient to disassemble and replace the filter element after a period of use.

[0004] However, in the aforementioned comparative patents, as the filter element is used, the filtered impurities gradually adhere to the surface of the filter element, causing the filtration efficiency of the filter element to gradually decrease. At this time, it is necessary to replace the filter element or remove the impurities on the surface of the filter element, resulting in a problem that the filter element replacement cycle is usually short. Summary of the Invention

[0005] The purpose of this invention is to provide a refrigerant recovery and charging machine that can extend the filter replacement cycle.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a refrigerant recovery and refueling machine, comprising a refrigerant recovery and refueling machine body and an external filter device disposed on the refrigerant recovery and refueling machine body, wherein the refrigerant recovery and refueling machine body is provided with an installation slot, an oil inlet pipe connected to the external filter device is provided at the upper end of the installation slot, and an oil outlet pipe connected to the external filter device is provided at the lower end of the installation slot. The external filter device includes a housing having an oil inlet end and an oil outlet end, a partition plate disposed in the middle of the housing and having a central hole, a cylindrical filter having its lower end rotatably connected to the partition plate and having an annular filter screen on its periphery, a press-type rotating mechanism disposed between the housing and the upper end of the cylindrical filter and realizing the rotation of the cylindrical filter, and a brush assembly disposed inside the housing and abutting against the surface of the cylindrical filter. An annular groove is formed between the upper surface edge of the partition plate and the housing.

[0007] By adopting the above technical solution, during the use of the refrigerant recovery and charging machine, the cylindrical filter is rotated by the pressing and rotating mechanism. During the rotation of the cylindrical filter, the brush assembly removes the impurities attached to the periphery of the cylindrical filter. The removed impurities can accumulate in the annular groove. Finally, by removing the surface impurities of the cylindrical filter, the service life and replacement cycle of the cylindrical filter is extended.

[0008] A further configuration of the present invention includes: a ratchet with four teeth disposed on the upper end of the cylindrical filter; a telescopic rod laterally telescopically disposed on the housing; a compression spring disposed between the telescopic rod and the housing and driving the telescopic rod to move away from the ratchet; a pressing rod disposed at one end of the telescopic rod and located outside the housing; a pawl hinged to the other end of the telescopic rod; an elastic metal pressure plate disposed between the telescopic rod and the pawl and driving the pawl to remain pressed against the periphery of the ratchet; and a square cross-section disposed on the upper surface of the ratchet. The filter has a square convex cover and two symmetrically arranged "L"-shaped elastic metal clips inside the housing. The two elastic metal clips abut against corresponding sides of the square convex cover. When the pressing rod is pressed to make the pawl drive the ratchet to rotate, the square convex cover rotates against the elastic force of the two elastic metal clips. When the pawl and the ratchet tooth of the ratchet are separated, the elastic metal clips return to their original position and abut against corresponding sides of the square convex cover, so that the cylindrical filter rotates 90 degrees. After the compression spring returns to its original position, it drives the pawl to engage on the next ratchet tooth of the ratchet.

[0009] By adopting the above technical solution, when the pressing rod is pressed, the compression spring is compressed, and the pawl remains against the circumference of the ratchet under the action of the elastic metal pressure plate, thereby pushing the ratchet tooth of the ratchet and causing the ratchet to rotate. When the ratchet rotates, the square convex cover on the ratchet opens the two elastic metal clips. Under the pushing force of the pawl and the resetting force of the elastic metal clips, the square convex cover is driven to rotate 90 degrees and then fixed. Then, after the pressing rod is released, the compression spring overcomes the elastic force of the elastic metal pressure plate during the resetting process and drives the pawl to reset, so that the pawl engages on the next ratchet tooth of the ratchet.

[0010] A further provision of the present invention is that: an end cap with an oil inlet is provided on the top of the housing, the end cap is fastened to the housing, a connecting seat is provided on the lower surface of the end cap, and two elastic metal clips are provided on the connecting seat. When the end cap is installed, the two elastic metal clips abut against the corresponding sides of the square convex cover.

[0011] By adopting the above technical solution, during the installation of the end cap, the connecting seat and the elastic metal clip on the end cap abut against the corresponding two sides of the square convex cap to achieve assembly, and at this time the elastic metal clip will not affect the disassembly and assembly of the cylindrical filter.

[0012] A further embodiment of the present invention is that the bristle assembly includes a bracket disposed on the inner wall of the housing, a bristle mounted on the bracket and pressed against the periphery of the cylindrical filter, and the upper and lower ends of the bracket are provided with plug-in posts extending in a vertically downward direction to achieve plug-in installation.

[0013] By adopting the above technical solution, since the brush may develop curl after prolonged use, the upper and lower ends of the bristle assembly bracket extend vertically downwards in a square shape and are plugged in for installation. This allows the bristle assembly bracket to be easily removed so that the brush can be replaced.

[0014] A further configuration of the present invention is as follows: the telescopic rods are located above the bracket and are staggered, the bracket is provided with a telescopic sleeve extending along the extension direction of the telescopic rods, and the telescopic rods are provided with telescopic portions that are telescopically disposed on the telescopic sleeves during the operation of the press-type rotating mechanism. When the telescopic rods move toward the limit state away from the cylindrical filter, the telescopic rods, pawls and elastic metal pressure plates pass through the telescopic sleeves.

[0015] By adopting the above technical solution, after the bracket of the bristle assembly is installed, the telescopic part of the telescopic rod passes through the telescopic part during the working process, thereby limiting the top of the bracket to prevent the bracket from becoming loose; and when the telescopic rod moves away from the cylindrical filter to its limit state, the telescopic rod, pawl and elastic metal pressure plate pass through the telescopic sleeve, so that the bracket can be taken out upward; at the same time, the telescopic rod and the telescopic part of the bracket are telescopically connected, which can improve the stability of the telescopic rod during telescopic extension and retraction.

[0016] A further feature of the present invention is that the partition plate is provided with an annular ring surrounding the central hole and into which the lower end of the cylindrical filter is embedded.

[0017] By adopting the above technical solution, the lower end of the cylindrical filter is embedded in the annular ring, thereby enabling the rotatable connection between the cylindrical filter and the baffle.

[0018] A further feature of the present invention is that a plurality of stirring blades located outside the annular ring and arranged in a circumferential array are provided on the periphery of the lower end of the cylindrical filter.

[0019] By adopting the above technical solution, during the rotation of the cylindrical filter, the stirring blades can achieve the rotational flow of the liquid above the baffle, so that the impurities attached to the liquid gradually accumulate in the annular groove.

[0020] A further feature of the present invention is that the oil outlet end of the housing is provided with a one-way valve, and the oil outlet pipe is inserted into the oil outlet end during installation and pushes open the one-way valve.

[0021] By adopting the above technical solution, the one-way valve can automatically close when the external filter is removed, thereby preventing residual liquid inside the housing from flowing out.

[0022] A further feature of the present invention is that the oil inlet end of the housing is provided with a threaded joint that is threadedly connected to the oil inlet pipe.

[0023] By adopting the above technical solution, since the oil outlet pipe needs to be embedded in the oil outlet end, the housing has a range of vertical movement during installation. By setting a threaded joint at the oil inlet end for telescopic movement, the installation of the housing can be easily achieved. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is an exploded view of the structure of the present invention;

[0027] Figure 3 This is an exploded view of the external filter device in this invention;

[0028] Figure 4 This is a schematic diagram of the external filter device in this invention;

[0029] Figure 5 This is a partial structural diagram of the external filter device used to show the internal structure of the device in this invention (end cap portion omitted);

[0030] Figure 6 It is located in the present invention Figure 5 A schematic diagram of a local structure based on the basic structure.

[0031] In the diagram: 1. Refrigerant recovery and charging machine body; 11. Mounting slot; 12. Oil inlet pipe; 13. Oil outlet pipe; 2. External filter device; 21. Housing; 211. End cap; 212. Oil inlet end; 213. Oil outlet end; 214. Connecting seat; 215. One-way valve; 216. Threaded joint; 22. Partition plate; 221. Annular groove; 222. Annular ring; 23. Cylindrical filter; 231. Stirring blade; 24. Press-type rotating mechanism; 241. Ratchet; 242. Telescopic rod; 2421. Telescopic part; 243. Compression spring; 244. Press rod; 245. Pawl; 246. Elastic metal pressure plate; 247. Square convex cover; 248. Elastic metal clip; 25. Brush assembly; 251. Bracket; 252. Brush; 253. Insertion post; 254. Telescopic sleeve. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Example: A refrigerant recovery and charging machine, such as Figure 1 and Figure 2 As shown, it includes a refrigerant recovery and charging machine body 1 and an external filter device 2 installed on the refrigerant recovery and charging machine body 1. The refrigerant recovery and charging machine body 1 is provided with an installation slot 11. An oil inlet pipe 12 connected to the external filter device 2 is provided at the upper end of the installation slot 11, and an oil outlet pipe 13 connected to the external filter device 2 is provided at the lower end of the installation slot 11.

[0034] like Figures 3 to 5 As shown, the external filter device 2 includes a housing 21 with an oil inlet end 212 and an oil outlet end 213, a partition 22 disposed in the middle of the housing 21 and having a central hole, a cylindrical filter 23 rotatably connected to the partition 22 at its lower end and having an annular filter screen on its periphery, a press-type rotating mechanism 24 disposed between the housing 21 and the upper end of the cylindrical filter 23 and realizing the rotation of the cylindrical filter 23, and a brush assembly 25 disposed inside the housing 21 and abutting against the surface of the cylindrical filter 23. An annular groove 221 is formed between the upper surface edge of the partition 22 and the housing 21.

[0035] like Figure 3 and Figure 4As shown, an end cap 211 with an oil inlet end 212 and fastened to the housing 21 is provided on the top of the housing 21. A threaded connector 216 with a telescopic connection to the oil inlet pipe 12 is provided on the oil inlet end 212. A one-way valve 215 is provided on the oil outlet end 213. The oil outlet pipe 13 is inserted into the oil outlet end 213 during installation and pushes open the one-way valve 215. An annular ring 222 is provided on the partition plate 22, surrounding the central hole and into which the lower end of the cylindrical filter 23 is inserted. The lower end of the cylindrical filter 23 is provided with a plurality of stirring blades 231 located outside the annular ring 222 and arranged in a circumferential array.

[0036] like Figures 2 to 6 As shown, the press-type rotating mechanism 24 includes a ratchet 241 with four ratchet teeth disposed on the upper end of the cylindrical filter 23, a telescopic rod 242 laterally telescopically disposed on the housing 21, a compression spring 243 disposed between the telescopic rod 242 and the housing 21 and driving the telescopic rod 242 to move away from the ratchet 241, a pressing rod 244 disposed at one end of the telescopic rod 242 and located outside the housing 21, a pawl 245 hinged to the other end of the telescopic rod 242, an elastic metal pressure plate 246 disposed between the telescopic rod 242 and the pawl 245 and driving the pawl 245 to remain pressed against the periphery of the ratchet 241, a square convex cover 247 disposed on the upper surface of the ratchet 241 and having a square cross-section, and two elastic metal clips 248 symmetrically disposed inside the housing 21 and having an "L" shape. Two elastic metal clips 248 abut against corresponding sides of the square convex cover 247. When the pressing rod 244 is pressed to cause the pawl 245 to drive the ratchet 241 to rotate, the square convex cover 247 rotates against the elastic force of the two elastic metal clips 248. When the pawl 245 and the ratchet tooth of the ratchet 241 separate, the elastic metal clips 248 return to their original position and abut against corresponding sides of the square convex cover 247, causing the cylindrical filter 23 to rotate 90 degrees. After the compression spring 243 returns to its original position, it causes the pawl 245 to engage with the next ratchet tooth of the ratchet 241. In addition, a connecting seat 214 is provided on the lower surface of the end cover 211, and two elastic metal clips 248 are provided on the connecting seat 214. After the end cover 211 is installed, the two elastic metal clips 248 abut against corresponding sides of the square convex cover 247.

[0037] like Figure 4 and Figure 5As shown, the brush assembly 25 includes a bracket 251 disposed on the inner wall of the housing 21, and a brush 252 mounted on the bracket 251 and pressed against the periphery of the cylindrical filter 23. The bracket 251 has insertion posts 253 extending vertically downwards at its upper and lower ends for insertion. A telescopic rod 242 is located above the bracket 251 and is staggered. The bracket 251 has a telescopic sleeve 254 extending along the extension direction of the telescopic rod 242. The telescopic rod 242 has a telescopic portion 2421 that extends and retracts onto the telescopic sleeve 254 during the operation of the press-type rotating mechanism 24. When the telescopic rod 242 moves away from the cylindrical filter 23 to its limit, the telescopic rod 242, pawl 245, and elastic metal pressure plate 246 protrude from the telescopic sleeve 254.

[0038] Implementation effect: During the use of the refrigerant recovery and charging machine, the cylindrical filter 23 is rotated by the press-type rotating mechanism 24. During the rotation of the cylindrical filter 23, the brush assembly 25 removes the impurities attached to the periphery of the cylindrical filter 23. The removed impurities can accumulate in the annular groove 221. Finally, by removing the surface impurities of the cylindrical filter 23, the service life and replacement cycle of the cylindrical filter 23 is extended.

[0039] When the pressing lever 244 is pressed, the compression spring 243 is compressed, and the pawl 245 remains against the circumference of the ratchet 241 under the action of the elastic metal pressure plate 246, thereby pushing the ratchet tooth of the ratchet 241 and causing the ratchet 241 to rotate. When the ratchet 241 rotates, the square convex cover 247 on the ratchet 241 opens the two elastic metal clips 248. Under the pushing force of the pawl 245 and the resetting force of the elastic metal clips 248, the square convex cover 247 is driven to rotate 90 degrees and then fixed. Then, after the pressing lever 244 is released, the compression spring 243 overcomes the elastic force of the elastic metal pressure plate 246 during the resetting process and drives the pawl 245 to reset, so that the pawl 245 engages on the next ratchet tooth of the ratchet 241.

[0040] Because the brush 252 may develop curling after prolonged use, the bracket 251 of the bristle assembly 25 extends vertically downwards in a square shape at both ends and is plugged in for easy removal of the bracket 251 to replace the brush 252. After the bracket 251 of the bristle assembly 25 is installed, the telescopic part 2421 of the telescopic rod 242 passes through the telescopic part 2421 during operation, thereby limiting the top of the bracket 251 to prevent it from becoming loose. When the telescopic rod 242 moves away from the cylindrical filter 23 to its limit, the telescopic rod 242, pawl 245, and elastic metal pressure plate 246 pass through the telescopic sleeve 254, allowing the bracket 251 to be removed upwards. Simultaneously, the telescopic rod 242 and the telescopic part 2421 of the bracket 251 are telescopically connected, improving the stability of the telescopic rod 242 during extension and retraction.

Claims

1. A refrigerant recovery dispenser, comprising a refrigerant recovery dispenser body (1), an external filter device (2) arranged on the refrigerant recovery dispenser body (1), the refrigerant recovery dispenser body (1) is provided with a mounting slot (11), the upper end of the mounting slot (11) is provided with an oil inlet pipe (12) connected with the external filter device (2), and the lower end of the mounting slot (11) is provided with an oil outlet pipe (13) connected with the external filter device (2), characterized in that: The external filter device (2) comprises a shell (21) with an oil inlet end (212) and an oil outlet end (213), a partition plate (22) arranged in the middle of the shell (21) and having a central hole, a cylindrical filter (23) rotatably connected to the lower end of the partition plate (22) and having an annular filter screen on the peripheral side, a pressing type rotating mechanism (24) arranged between the upper end of the shell (21) and the cylindrical filter (23) and enabling the rotation of the cylindrical filter (23), and a bristle assembly (25) arranged inside the shell (21) and abutting against the surface of the cylindrical filter (23), wherein an annular groove (221) is formed between the upper surface edge of the partition plate (22) and the shell (21). The pressing type rotating mechanism (24) comprises a ratchet wheel (241) arranged at the upper end of the cylindrical filter (23) and having four ratchet teeth, an extension rod (242) horizontally arranged on the shell (21), a compression spring (243) arranged between the extension rod (242) and the shell (21) and enabling the extension rod (242) to move towards the direction away from the ratchet wheel (241), a pressing rod (244) arranged at one end of the extension rod (242) and outside the shell (21), a pawl (245) hingedly arranged at the other end of the extension rod (242), an elastic metal pressing sheet (246) arranged between the extension rod (242) and the pawl (245) and enabling the pawl (245) to be kept in abutment against the peripheral side of the ratchet wheel (241), a square-shaped convex cover (247) arranged on the upper surface of the ratchet wheel (241) and having a square-shaped cross section, and two elastic metal clamping sheets (248) symmetrically arranged inside the shell (21) and having an "L" shape. The two elastic metal clamping sheets (248) abut against the corresponding two sides of the square-shaped convex cover (247), when the pressing rod (244) is pressed to enable the pawl (245) to drive the ratchet wheel (241) to rotate, the square-shaped convex cover (247) rotates against the elastic force of the two elastic metal clamping sheets (248), when the ratchet teeth of the pawl (245) and the ratchet wheel (241) are separated, the elastic metal clamping sheets (248) are reset to abut against the corresponding two sides of the square-shaped convex cover (247) to enable the cylindrical filter (23) to rotate by 90 degrees, and the compression spring (243) is reset to enable the pawl (245) to engage with the next ratchet tooth of the ratchet wheel (241).

2. The refrigerant recovery and charging apparatus according to claim 1, wherein: The shell (21) is provided with an end cover (211) having an oil inlet end (212) at the top, the end cover (211) is buckled on the shell (21), the lower surface of the end cover (211) is provided with a connecting seat (214), and the two elastic metal clamping sheets (248) are arranged on the connecting seat (214), when the end cover (211) is installed, the two elastic metal clamping sheets (248) abut against the corresponding two sides of the square-shaped convex cover (247).

3. A refrigerant recovery and charging machine according to claim 2, wherein: The brush assembly (25) comprises a support (251) arranged on the inner wall of the shell (21), and a brush (252) mounted on the support (251) and abutting against the circumferential side of the cylindrical filter (23), wherein the support (251) is provided with plug-in columns (253) extending along the vertically downward direction and achieving plug-in mounting at the upper and lower ends of the support (251).

4. A refrigerant recovery and recharge machine as set forth in claim 3 wherein: The telescopic rods (242) are arranged above the support (251) in a staggered manner, and the support (251) is provided with telescopic sleeves (254) extending along the extension direction of the telescopic rods (242), and the circumferential side of the telescopic rods (242) is provided with telescopic portions (2421) telescopically arranged on the telescopic sleeves (254) during the operation of the press-type rotating mechanism (24), and when the telescopic rods (242) move to the limit state away from the cylindrical filter (23), the telescopic rods (242), the pawls (245) and the elastic metal pressing sheets (246) penetrate out of the telescopic sleeves (254).

5. The refrigerant recovery and charging machine of claim 1, wherein: The partition plate (22) is provided with an annular ring (222) surrounding the central hole and embedded with the lower end of the cylindrical filter (23).

6. A refrigerant recovery and charging machine according to claim 5, wherein: The circumferential side of the lower end of the cylindrical filter (23) is provided with a plurality of stirring blades (231) arranged in a circumferential array outside the annular ring (222).

7. The refrigerant recovery and recharge machine of claim 1 wherein: The oil outlet end (213) of the shell (21) is provided with a one-way valve (215), and the oil outlet pipe (13) is plug-in embedded in the oil outlet end (213) during installation and opens the one-way valve (215).

8. A refrigerant recovery and charging machine according to claim 7, wherein: The oil inlet end (212) of the shell (21) is telescopically provided with a threaded joint (216) screwed on the oil inlet pipe (12).

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