CN109059365A - A kind of air-conditioning freon recycling purification system - Google Patents

Abstract

The present invention belongs to the technical field of recovering freon, and is specifically an air-conditioning freon recovery and purification system, including an incubator, a heating box, No. 1 pipe, No. 2 pipe and an air conditioner; and a spiral pipe, No. 3 pipe and a constant pressure unit; The inside of the incubator is provided with a constant pressure unit; the No. 3 tube includes an inner tube and an outer tube, and there is a No. 1 oil-absorbing sponge, No. 2 oil-absorbing sponge and an oil-absorbing layer between the inner tube and the outer tube. By setting the spiral plate at the inner tube, the liquid freon flows according to the trajectory of the spiral plate, which increases the contact area between the liquid freon and the oil-absorbing layer, and makes the oil-absorbing layer more fully adsorb the oil in the liquid freon, thus improving the performance of the liquid freon. The oil absorption and adsorption effect of liquid freon; at the same time, an extrusion block is set on the inner wall of the outer tube, and the extrusion block squeezes the No. 1 oil-absorbing sponge, making it easier to extract the oil, thereby improving the efficiency of oil extraction.

Description

An air conditioner Freon recovery and purification system

technical field

The invention belongs to the technical field of Freon recovery, in particular to an air conditioner Freon recovery and purification system.

Background technique

Freon is widely used in household appliances, foam plastics, daily chemicals, automobiles, fire-fighting equipment and other fields, especially as a refrigerant in air conditioners and air conditioners. At present, there are hundreds of millions of air conditioners in use nationwide, and tens of millions of electric air conditioners. According to the statistics of relevant departments, only tens of millions of air conditioners and air conditioners are repaired and maintained every year, and nearly ten million units are scrapped at the same time. These discarded air-conditioners and air-conditioning products emit tens of thousands of tons of Freon every year, and the harm is immeasurable.

There are two main ways to solve the problem of Freon emissions: one is to vigorously develop fluorine-free alternative products; the other is to strengthen the recycling and reuse of Freon. The fluorine-free alternative technology has just been applied to newly developed air conditioners, but it is very important to strengthen the recovery and reuse of freon for a large number of old air conditioners and air conditioners that are already in use.

The current recovery methods at home and abroad are basically divided into compression recovery method, adsorption re-separation method, cooling condensation recovery, etc. Generally, due to the constraints of low technology maturity, complex process flow, and high recovery costs, air conditioners, air conditioner installation and maintenance companies Few recovery equipments are used in auto repair stations, and due to the influence of short-term economic interests and weak environmental protection awareness of maintenance companies, the phenomenon of arbitrary discharge of Freon refrigerants is very serious. As we all know, freon is the culprit of the destruction of the ozone layer. One kilogram of freon can capture and eliminate about 70,000 kilograms of ozone. After the ozone layer is depleted, the ability to absorb ultraviolet radiation is greatly weakened, resulting in a significant increase in ultraviolet rays reaching the earth's surface, which is harmful to human health and the ecological environment. cause multiple hazards. Therefore, it is urgent to strengthen the recycling of Freon.

In the prior art, there are also some technical solutions for the recovery and purification system of Freon in air conditioners. For example, a Chinese patent with application number 201410810882 discloses a device and method for recovering Freon in air conditioners, including a condensation separator and a condensation separator There are gaseous Freon inlets and liquid nitrogen inlets on the side of the condensing separator; a nitrogen outlet is opened on the top of the condensation separator, and a liquid Freon outlet for recovering liquid Freon is opened at the bottom; a heat exchange coil is arranged in the condensation separator, and the heat exchange coil The inlet is connected to the external liquid nitrogen source through the liquid nitrogen inlet, the outlet is connected to one end of the heat exchange tube of the air conditioner through a cold insulation pipe, and the other end of the heat exchange tube is connected to the gaseous Freon inlet; the nitrogen is connected to the other end of the nitrogen outlet. The cooling pipe is discharged outside.

The equipment and method for recovering freon in the air conditioner of the technical proposal, the invention uses a physical cooling method, uses non-polluting liquid nitrogen as the coolant, and implements the recovery of freon conveniently and efficiently. However, this scheme cannot fully absorb the oil in the liquid Freon, so that the oil-containing liquid Freon is mixed with the oil-free liquid Freon, so that the purity of the recovered liquid Freon is insufficient; at the same time, the Freon cannot be recovered in the incubator. Volatility is effectively improved; thus the technical solution is limited.

Contents of the invention

In order to make up for the deficiencies of the existing technology, the present invention proposes a Freon recovery and purification system for air conditioners. By setting the spiral plate at the inner pipe, the liquid Freon flows according to the trajectory of the spiral plate, which increases the contact area between the liquid Freon and the oil-absorbing layer. , so that the oil-absorbing layer can more fully absorb the oil in the liquid freon, thereby improving the oil-absorbing effect on the liquid freon; at the same time, an extrusion block is set on the inner wall of the outer tube, and the extrusion block squeezes the No. 1 oil-absorbing sponge, so that The oil is more easily drawn off, thereby increasing the efficiency with which the oil is drawn off.

The technical scheme adopted by the present invention to solve the technical problem is: a kind of air-conditioning Freon recovery and purification system according to the present invention, comprising an incubator, a heating box, No. 1 pipe, No. 2 pipe and air conditioner; tube and constant pressure unit; the interior of the incubator is provided with a constant pressure unit, and the outer wall of the incubator is fixedly installed with a spiral tube; one end of the spiral tube is connected to the No. 1 tube, and the other end of the spiral tube is used as the liquid nitrogen inlet; The middle part of the No. 1 pipe is connected with a heating box; one end of the No. 2 pipe is connected with the air conditioner, and the other end of the No. 2 pipe is connected with the No. 1 pipe; a No. 1 hole is provided on the left side of the incubator, and a No. 2 hole, the top of the incubator is provided with No. 3 hole; the air conditioner communicates with No. 1 hole through No. 3 pipe, and No. 1 hole is located below the constant pressure unit; wherein,

The constant pressure unit includes the No.1 plate, the sliding telescopic rod and the No.2 plate; the No.1 plate is fixedly connected with the No. Below, the No. 1 plate is fixedly connected with the side wall of the incubator, and No. 4 holes are opened on the No. 1 plate. When working, the liquid nitrogen is transported from the liquid nitrogen inlet to the spiral tube, and the liquid nitrogen reaches the No. 1 tube from the end of the spiral tube, and is heated by the heating box in the No. 1 tube to vaporize the liquid nitrogen. The No. 2 pipe is transported to the air conditioner, and the vaporized liquid nitrogen condenses the gaseous Freon in the air conditioner, and the gaseous Freon is in the form of liquid Freon and nitrogen; the liquid Freon and nitrogen are transported from the No. 1 hole to the incubator through the No. 3 pipe. Under the action of the pressure unit, the volatilization of Freon is avoided, so that the liquid Freon is drawn out of the incubator from the second hole for recycling, and the nitrogen gas is discharged from the incubator from the third hole through the constant pressure unit.

Preferably, the No. 3 tube includes an inner tube and an outer tube, both of which are metal tubes, and a No. 1 oil-absorbing sponge is arranged between the inner tube and the outer tube; the No. 1 oil-absorbing sponge is in contact with the outer wall of the inner tube, The No. 1 oil-absorbing sponge slides between the inner tube and the outer tube; the outer tube has a No. 5 hole, and the inner tube has a set of No. 6 holes; the No. 2 oil-absorbing sponge is arranged in the No. 6 hole; the No. 2 oil-absorbing sponge One end of the sponge is fixedly connected with No. 1 oil-absorbing sponge, and the other end of No. 2 oil-absorbing sponge is fixedly connected with an oil-absorbing layer. When working, when the liquid Freon passes through the No. 3 pipe from left to right, the No. 1 oil-absorbing sponge, the No. 2 oil-absorbing sponge and the oil-absorbing layer absorb the oil in the liquid Freon, so that the liquid Freon can be adsorbed and purified, thereby improving the efficiency of the liquid Freon. Purity, thereby improving the recycling rate of liquid freon.

Preferably, the inner tube is provided with a spiral plate, and the spiral plate is fixedly installed on the inner wall of the inner tube through a bracket. When working, the liquid Freon passes through the No. 3 tube from left to right. When the liquid Freon flows through the inner tube, because the inner tube is equipped with a spiral plate, the liquid Freon flows according to the trajectory of the spiral plate, which increases the relationship between the liquid Freon and the oil absorption. The contact area of the layer makes the oil-absorbing layer more fully adsorb the oil in the liquid freon, thereby improving the oil absorption and adsorption effect on the liquid freon.

Preferably, an extruding block is provided at the outer tube; one end of the extruding block is fixed on the inner wall of the outer tube, and the other end of the extruding block is in contact with No. 1 oil-absorbing sponge. When working, when the liquid Freon flows through the No. 3 pipe from left to right, the No. 1 sponge absorbs the oil in the liquid Freon, and then squeezes the No. 1 oil-absorbing sponge through the extrusion block arranged on the inner wall of the outer pipe. The pressure makes it easier for the oil to be extracted from the fifth hole to the third pipe, thereby improving the efficiency of oil extraction.

Preferably, a sleeve is provided on the outside of the No. 2 oil-absorbing sponge. When working, when the liquid Freon passes through the No. 3 pipe from left to right, the No. 2 oil-absorbing sponge absorbs the oil in the liquid Freon for a long time, which makes the No. 2 oil-absorbing sponge easy to be damaged. The sleeve protects the No. 2 oil-absorbing sponge, thereby reducing the damage to the No. 2 oil-absorbing sponge.

Preferably, a baffle is provided at the bottom of the No. 2 board; one end of the baffle is fixedly connected to the bottom of the No. 2 board, and the other end of the baffle is located above the No. 1 board, and the length of the baffle gradually increases toward both sides. The baffle forms an arc shape at the bottom of the No. 2 plate. When working, after the liquid Freon and nitrogen are transported to the incubator, due to the unstable pressure in the incubator, it is easy to cause Freon to volatilize, so that the liquid Freon cannot be recycled from the No. 2 hole. By setting the baffle at the bottom of the No. 2 plate , the length of the baffle gradually increases to both sides, and the baffle blocks the No. The number plate moves upward to maintain a constant pressure in the incubator, avoiding the volatilization of Freon, thereby improving the recycling rate of liquid Freon.

Preferably, a balance weight is provided at the bottom of the No. 1 plate, and the balance weight is located below the No. 4 hole. The balance weight is fixedly connected to the baffle through a connecting rod, and the balance weight is surrounded by the same arc shape as the baffle; The balance weight is fixedly connected to the bottom of the No. 1 plate through a spring, the upper and lower sides of the balance weight are provided with arc grooves, and both sides of the balance weight are provided with No. 7 holes; the No. 7 holes communicate with the arc grooves. When working, when the liquid freon and nitrogen are continuously delivered to the incubator, the No. 2 plate moves upward under the action of air pressure. By setting the balance weight, the balance block will block the opening of the No. 4 hole, and the nitrogen gas will flow from No. 7 on both sides of the balance weight. The hole escapes to the No. 4 hole, which is used to balance the outflow of nitrogen.

The beneficial effects of the present invention are as follows:

1. An air-conditioning Freon recovery and purification system according to the present invention, liquid nitrogen reaches the No. 1 tube along the spiral tube, and is heated by the heating box in the No. 1 tube to vaporize the liquid nitrogen, and the vaporized liquid nitrogen passes through the No. 2 tube Transported to the air conditioner, the vaporized liquid nitrogen condenses the gaseous Freon in the air conditioner, and the gaseous Freon forms liquid Freon and nitrogen.

2. An air-conditioning Freon recovery and purification system according to the present invention, the oil in the liquid Freon is adsorbed by the No. 1 oil-absorbing sponge, the No. 2 oil-absorbing sponge and the oil-absorbing layer, so that the liquid Freon is adsorbed and purified, thereby improving the liquid Freon. Purity, thereby improving the recycling rate of liquid freon.

3. In the air-conditioning Freon recovery and purification system of the present invention, the spiral plate is arranged at the inner pipe, and the liquid Freon flows according to the trajectory of the spiral plate, which increases the contact area between the liquid Freon and the oil-absorbing layer, making the oil-absorbing layer more Sufficiently absorb the oil in the liquid freon, thereby improving the oil absorption and adsorption effect on the liquid freon; at the same time, an extrusion block is set on the inner wall of the outer tube, and the extrusion block squeezes the No. 1 oil-absorbing sponge, making it easier to extract the oil , thereby improving the efficiency of oil extraction.

4. An air-conditioning Freon recovery and purification system according to the present invention, through the mutual cooperation between the No. 1 plate, the No. 2 plate, the baffle plate and the balance weight, not only balances the outflow of nitrogen, but also makes Freon less volatile, thereby improving the liquid state. Freon recycling rate.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is the front view of the present invention;

Fig. 2 is the sectional view of pipe No. 3 in Fig. 1;

Fig. 3 is a partial enlarged view of place A in Fig. 1;

In the figure: incubator 1, No. 1 hole 11, No. 2 hole 12, No. 3 hole 13, heating box 2, No. 1 tube 3, No. 2 tube 4, air conditioner 5, spiral tube 6, No. 3 tube 7, inner tube 71. No. 6 hole 711, outer tube 72, No. 5 hole 721, No. 1 oil-absorbing sponge 73, No. 2 oil-absorbing sponge 74, oil-absorbing layer 75, spiral plate 76, extrusion block 77, sleeve 78, constant pressure unit 8, No. 1 plate 81, No. 4 hole 811, sliding telescopic rod 82, No. 2 plate 83, baffle plate 84, balance weight 85, No. 7 hole 851, arc groove 852, connecting rod 86.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

As shown in Fig. 1 to Fig. 3, a kind of air-conditioning freon recovery and purification system of the present invention includes incubator 1, heating box 2, No. 1 pipe 3, No. 2 pipe 4 and air conditioner 5; also includes spiral pipe 6, No. 3 pipe 7 and constant pressure unit 8; the interior of the incubator 1 is provided with a constant pressure unit 8, and the outer wall of the incubator 1 is fixedly connected with a spiral pipe 6; one end of the spiral pipe 6 communicates with the No. 1 pipe 3, The other end of the spiral tube 6 is used as the liquid nitrogen inlet; the middle part of the No. 1 tube 3 is connected with a heating box 2; one end of the No. 2 tube 4 is connected with the air conditioner 5, and the other end of the No. 2 tube 4 is connected with the No. 1 tube 3; The left side of the incubator 1 is provided with a No. 1 hole 11, the right side of the incubator 1 is provided with a No. 2 hole 12, and the top of the incubator 1 is provided with a No. 3 hole 13; the air conditioner 5 passes through the No. 3 pipe 7 and the No. 1 hole 11 connected, the No. 1 hole 11 is located below the constant pressure unit 8; wherein,

The constant pressure unit 8 includes a No.1 plate 81, a sliding telescopic rod 82 and a No. , the No. 1 plate 81 is located below the No. 2 plate 83 , the No. 1 plate 81 is fixedly connected with the side wall of the incubator 1 , and the No. 4 hole 811 is opened on the No. 1 plate 81 . When working, the liquid nitrogen is transported from the liquid nitrogen inlet to the spiral tube 6, and the liquid nitrogen reaches the No. 1 tube 3 from the end of the spiral tube 6, and is heated by the heating box 2 in the No. 1 tube 3, so that the liquid nitrogen is vaporized and vaporized The final liquid nitrogen is delivered to the air conditioner 5 through the second pipe 4, and the vaporized liquid nitrogen condenses the gaseous freon in the air conditioner 5, and the gaseous freon is in the form of liquid freon and nitrogen; the liquid freon and nitrogen pass through the third pipe 7 from the first The hole 11 is transported to the incubator 1, and under the action of the constant pressure unit 8, the volatilization of Freon is avoided, so that the liquid Freon is extracted from the incubator 1 from the No. The incubator 1 is discharged from the hole 13.

As an embodiment of the present invention, the No. 3 pipe 7 includes an inner pipe 71 and an outer pipe 72. Both the inner pipe 71 and the outer pipe 72 are metal pipes. A No. 1 oil-absorbing sponge is arranged between the inner pipe 71 and the outer pipe 72. 73; the No. 1 oil-absorbing sponge 73 is in contact with the outer wall of the inner tube 71, and the No. 1 oil-absorbing sponge 73 slides between the inner tube 71 and the outer tube 72; the outer tube 72 is provided with a fifth hole 721, and the inner tube 71 is provided with a set of No. 6 hole 711; No. 2 oil-absorbing sponge 74 is arranged in No. 6 hole 711; one end of No. 2 oil-absorbing sponge 74 is fixedly connected with No. 1 oil-absorbing sponge 73, and the other end of No. 2 oil-absorbing sponge 74 is fixedly connected with an oil-absorbing layer 75. When working, when the liquid Freon passes through the No. 3 pipe 7 from left to right, the No. 1 oil-absorbing sponge 73, the No. 2 oil-absorbing sponge 74 and the oil-absorbing layer 75 absorb the oil in the liquid Freon, so that the liquid Freon is adsorbed and purified, thereby improving The purity of liquid freon is improved, and the recycling rate of liquid freon is improved.

As an embodiment of the present invention, the inner tube 71 is provided with a spiral plate 76, and the spiral plate 76 is fixedly installed on the inner wall of the inner tube 71 through a bracket. When working, the liquid Freon passes through the No. 3 tube 7 from left to right. When the liquid Freon flows through the inner pipe 71, since the inner pipe 71 is provided with a spiral plate 76, the liquid Freon flows according to the trajectory of the spiral plate 76, increasing The contact area between the liquid freon and the oil-absorbing layer 75 is increased, so that the oil-absorbing layer 75 can more fully absorb the oil in the liquid freon, thereby improving the oil absorption and adsorption effect on the liquid freon.

As an embodiment of the present invention, the outer tube 72 is provided with an extruding block 77; one end of the extruding block 77 is fixed on the inner wall of the outer tube 72, and the other end of the extruding block 77 is in contact with No. 1 oil-absorbing sponge 73 . When working, when the liquid freon flows through the No. 3 tube 7 from left to right, after the No. 1 sponge absorbs the oil in the liquid freon, it passes through the extrusion block 77 arranged on the inner wall of the outer tube 72, and the No. 1 sponge passes through the extrusion block 77. The oil-absorbing sponge 73 squeezes, making it easier for the oil to be drawn out of the No. 3 pipe 7 from the No. 5 hole 721, thereby improving the efficiency of the oil being drawn out.

As an embodiment of the present invention, a sleeve 78 is provided on the outside of the No. 2 oil-absorbing sponge 74 . When working, when liquid freon passes through No. 3 pipe 7 from left to right, No. 2 oil-absorbing sponge 74 absorbs the oil in liquid freon for a long time, making No. 2 oil-absorbing sponge 74 easily damaged. Sleeves 78 are arranged on both sides, and the sleeves 78 protect the No. 2 oil-absorbing sponge 74, thereby reducing damage to the No. 2 oil-absorbing sponge 74.

As an embodiment of the present invention, the bottom of the No. 2 board 83 is provided with a baffle 84; , the length of the baffle plate 84 gradually increases toward both sides, and the baffle plate 84 forms an arc shape at the bottom of the second plate 83 . During work, after the liquid Freon and nitrogen are transported to the incubator 1, since the pressure in the incubator 1 is not constant, it is easy to cause the volatilization of Freon, so that the liquid Freon cannot be recycled from the second hole 12. A baffle 84 is set at the bottom, and the length of the baffle 84 gradually increases toward both sides. At the beginning, the baffle 84 blocks the No. 4 plate. The continuous delivery of liquid freon and nitrogen makes the pressure of the incubator 1 under the No. 1 plate 81 increase. , under the action of pressure, the No. 2 plate 83 is pushed upward to maintain a constant pressure in the incubator 1, avoiding the volatilization of Freon, thereby improving the recycling rate of liquid Freon.

As an embodiment of the present invention, the bottom of the No. 1 plate 81 is provided with a balance weight 85, the balance weight 85 is located below the No. The block 85 is surrounded by the same arc shape as the baffle plate 84; the balance block 85 is fixedly connected to the bottom of the No. 1 plate 81 by a spring, and the upper and lower sides of the balance block 85 are provided with arc grooves 852, and the two sides of the balance block 85 There is a No. 7 hole 851 on the side; the No. 7 hole 851 communicates with the arc groove 852 . During work, when the liquid freon and nitrogen are continuously delivered to the incubator 1, the No. 2 plate 83 moves upward under the action of air pressure. By setting the balance weight 85, the opening of the fourth hole 811 is blocked by the balance weight 85, and the nitrogen gas flows from the balance weight. No. 7 hole 851 on both sides of 85 escapes to No. 4 hole 811 to balance the outflow of nitrogen.

When working, the liquid nitrogen is transported from the liquid nitrogen inlet to the spiral tube 6, and the liquid nitrogen reaches the No. 1 tube 3 from the end of the spiral tube 6, and is heated by the heating box 2 in the No. 1 tube 3, so that the liquid nitrogen is vaporized and vaporized The final liquid nitrogen is transported to the air conditioner 5 through the second pipe 4, and the vaporized liquid nitrogen condenses the gaseous freon in the air conditioner 5, and the gaseous freon forms liquid freon and nitrogen; when the liquid freon and nitrogen pass through the third pipe 7, a No. 7 oil-absorbing sponge 73 and No. 2 oil-absorbing sponge 74 absorb the oil in the liquid freon. When the liquid freon flows through the inner tube 71, the liquid freon flows according to the trajectory of the spiral plate 76, which increases the distance between the oil in the liquid freon and the oil-absorbing layer 75. The contact area increases the oil absorption efficiency; when liquid freon flows through the outer tube 72, the extrusion block 77 set on the inner wall of the outer tube 72 squeezes the No. 2 oil-absorbing sponge 74, so that the oil can be more conveniently pumped from the No. 5 hole 721 The liquid freon and nitrogen after the oil absorption treatment are transported from the first hole 11 to the incubator 1, and under the action of the constant pressure unit 8, the volatilization of freon is avoided, so that the liquid freon is drawn out of the incubator 1 from the second hole 12 Recycling is carried out, and the nitrogen flow is balanced by the balance weight 85 at the same time, and the nitrogen is discharged from the incubator 1 from the third hole 13 .

The above-mentioned front, back, left, right, up, and down are all based on Figure 1 in the accompanying drawings of the specification, and according to the viewing angle of the person as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left. And so on.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. An air conditioner Freon recovery and purification system, comprising an incubator (1), a heating box (2), a No. 1 pipe (3), a No. 2 pipe (4) and an air conditioner (5); it is characterized in that: it also includes a spiral pipe (6), No. 3 pipe (7) and constant pressure unit (8); the inside of the incubator (1) is provided with a constant pressure unit (8), and the outer wall of the incubator (1) is fixedly connected with a spiral tube ( 6); one end of the spiral tube (6) communicates with the No. 1 tube (3), and the other end of the spiral tube (6) is used as a liquid nitrogen inlet; the middle part of the No. 1 tube (3) is connected with a heating box (2); the One end of the No. 2 pipe (4) communicates with the air conditioner (5), and the other end of the No. 2 pipe (4) communicates with the No. 1 pipe (3); the left side of the incubator (1) is provided with a No. 1 hole (11), The right side of incubator (1) is provided with No. 2 hole (12), and the top of incubator (1) is provided with No. 3 hole (13); Described air conditioner (5) passes No. 3 pipe (7) and No. 1 hole ( 11) connected, No. 1 hole (11) is located below the constant pressure unit (8); wherein, Described constant pressure unit (8) comprises No. 1 board (81), sliding expansion rod (82) and No. 2 board (83); Described No. 1 board (81) connects No. 2 board ( 83) Fixed connection, the outer side of the sliding telescopic rod (82) is covered with a spring, the No. 1 plate (81) is located under the No. 2 plate (83), and the No. 1 plate (81) is fixedly connected with the side wall of the incubator (1). A No. 4 hole (811) is provided on the No. 1 plate (81). 2. An air-conditioning Freon recovery and purification system according to claim 1, characterized in that: the No. 3 pipe (7) includes an inner pipe (71) and an outer pipe (72), and the inner pipe (71) and the outer pipe (72) are all metal pipes, and No. 1 oil-absorbing sponge (73) is arranged between the inner pipe (71) and the outer pipe (72); the No. 1 oil-absorbing sponge (73) is in contact with the outer wall of the inner pipe (71), and No. 1 The oil-absorbing sponge (73) slides between the inner tube (71) and the outer tube (72); the outer tube (72) is provided with a No. 5 hole (721), and the inner tube (71) is provided with a group of No. 6 holes (711) No. 2 oil-absorbing sponge (74) is provided in the No. 6 hole (711); one end of No. 2 oil-absorbing sponge (74) is fixedly connected with No. 1 oil-absorbing sponge (73), and the other end of No. 2 oil-absorbing sponge (74) An oil-absorbing layer (75) is fixedly connected. 3. An air-conditioning Freon recovery and purification system according to claim 2, characterized in that: the inner pipe (71) is provided with a spiral plate (76), and the spiral plate (76) is fixed and installed inside by a bracket on the inner wall of the tube (71). 4. A Freon recovery and purification system for air conditioners according to claim 2, characterized in that: the outer tube (72) is provided with an extruding block (77); one end of the extruding block (77) is fixed on the outer tube On the inwall of (72), the extruding block (77) other end contacts with No. 1 oil-absorbing sponge (73). 5. A Freon recovery and purification system for air conditioners according to claim 2, characterized in that: a sleeve (78) is provided outside the No. 2 oil-absorbing sponge (74). 6. A Freon recovery and purification system for air conditioners according to claim 1, characterized in that: a baffle (84) is provided at the bottom of the second plate (83); one end of the baffle (84) is fixedly connected to the second The bottom of No. plate (83), the other end of baffle plate (84) is positioned at the top of No. 1 plate (81), and the length of baffle plate (84) increases gradually to both sides, and baffle plate (84) is on No. 2 plate (83) ) is surrounded by a circular arc at the bottom. 7. An air conditioner Freon recovery and purification system according to claim 1, characterized in that: a balance weight (85) is provided at the bottom of the No. 1 plate (81), and the balance weight (85) is located in the No. 4 hole ( 811), the balance weight (85) is fixedly connected with the baffle plate (84) by the connecting rod (86), and the balance weight (85) surrounds the same arc shape as the baffle plate (84); the balance weight (85) ) is fixedly connected to the bottom of the No. 1 plate (81) by a spring, and the upper and lower sides of the balance weight (85) are provided with arc grooves (852), and the two sides of the balance weight (85) are provided with No. 7 holes (851); The No. 7 hole (851) communicates with the arc groove (852).