Device for realizing online precise blending of refrigerant

Abstract

The invention discloses a device for achieving online precise blending of a refrigerant, the device comprises a blending pipe, and one side of the blending pipe is fixedly connected with a refrigerant inlet pipe. The device has the beneficial effects that by arranging a piston, a limiting sliding plate, a self-sealing rod and an adjusting lead screw, the adjusting lead screw is rotationally adjusted through a rotating screwing block; an adjusting lead screw drives a side connecting box on the outer side to slide in a self-sealing rod, the position of a piston is adjusted, the amount of refrigerants in a blending pipe and a full pipe detection box is controlled and adjusted, metering of the refrigerants is completed through the blending pipe and the full pipe detection box, metering errors are eliminated, a mixing shaft and a gear are arranged, and the metering precision is improved. According to the mixing device, the gears on the outer side are driven to rotate when one mixing shaft rotates, the meshed gears can be driven to rotate when one gear rotates, the three gears drive the mixing shaft on the inner side to rotate in the mixing pipe, uniform mixing of refrigerants is completed in the mixing pipe, and the mixing precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blending devices, and specifically to a device for realizing on-line precise blending of refrigerants. Background Technique

[0002] Refrigerants, also known as refrigeration working fluids, refrigerants, refrigerants or refrigerants, are working media that achieve cycle refrigeration in refrigeration devices. They achieve the refrigeration effect through continuous circulation in the refrigeration system and by using their own state changes (such as vaporization and condensation). Specifically, the refrigerant absorbs the heat of the medium to be cooled and vaporizes in the evaporator, and then transfers the absorbed heat to the surrounding air or water in the condenser, and then condenses into a liquid to complete a refrigeration cycle. On-line precise blending of refrigerants is a process of precisely proportioning and mixing refrigerants using advanced on-line monitoring and control technologies in the refrigeration system or the refrigerant production process. The traditional refrigerant blending process often relies on manual operation, and there are problems such as low blending accuracy, low efficiency, and easy errors. Due to the subjectivity and uncertainty of manual operation, it is difficult to achieve precise proportional control in the traditional refrigerant blending process, resulting in unstable performance of the blended refrigerant and affecting the normal operation of the refrigeration system. The traditional refrigerant blending process requires manual weighing, mixing and detection multiple times, with cumbersome operations and long time consumption, seriously restricting the production efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for realizing on-line precise blending of refrigerants, so as to solve the problems raised in the above background technique that due to the subjectivity and uncertainty of manual operation, it is difficult to achieve precise proportional control in the traditional refrigerant blending process, resulting in unstable performance of the blended refrigerant and affecting the normal operation of the refrigeration system. The traditional refrigerant blending process requires manual weighing, mixing and detection multiple times, with cumbersome operations and long time consumption, seriously restricting the production efficiency.

[0004] To achieve the above object, the present invention provides the following technical solution: A device for realizing online precise blending of refrigerants, including a blending pipe, one side of the blending pipe is fixedly connected with a refrigerant inlet pipe, one end of the refrigerant inlet pipe is fixedly connected with a first communication pipe, a plurality of connecting outlet pipes are fixedly connected to the bottom of the first communication pipe at equal intervals, the bottom end of the connecting outlet pipe is fixedly connected with a refrigerant storage tank, three mixing shafts are rotatably connected to the inside of the blending pipe at equal intervals, a through hole is opened at the top of the blending pipe, a full pipe detection box is fixedly connected to the top of the blending pipe, a piston is slidably connected to the inside of the full pipe detection box, a limiting slide plate is fixedly connected to the top of the piston, a self-sealing rod is slidably connected to the outside of the limiting slide plate, a fixed top box is fixedly connected to the top of the full pipe detection box, the self-sealing rod is slidably connected to the fixed top box and the full pipe detection box, a refrigerant outlet pipe is fixedly connected to the bottom of the blending pipe, a flow meter is installed on the refrigerant outlet pipe, one end of the refrigerant outlet pipe is fixedly connected with a second communication pipe, a plurality of third communication pipes are fixedly connected to the second communication pipe, one end of the third communication pipe is fixedly connected with a refrigerant circulation pipe, a vacuum pumping pipe is fixedly connected to one side of the blending pipe, a vacuum pumping device is installed at one end of the vacuum pumping pipe, and a fourth solenoid valve is installed on the vacuum pumping pipe.

[0005] As a preferred solution of the present invention: A fixed side box is fixedly connected to one side of the blending pipe, all three mixing shafts are rotatably connected to the fixed side box, gears are fixedly connected to the outside of all three mixing shafts, the three gears are meshed with each other, a motor is installed on one side of the fixed side box, and one end of one of the mixing shafts is fixedly connected to the output end of the motor.

[0006] As a preferred solution of the present invention: An adjusting screw rod is threadedly connected to the inside of the limiting slide plate, the adjusting screw rod is rotatably connected to the self-sealing rod, a rotating knob is rotatably connected to the top of the self-sealing rod, and the top end of the adjusting screw rod is fixedly connected to the rotating knob.

[0007] As a preferred solution of the present invention: Side connection boxes are symmetrically and fixedly connected to the inside of the fixed top box, an outer sliding plate is fixedly connected to the outside of the self-sealing rod, the outer sliding plate is slidably connected to the fixed top box, side sliding plates are symmetrically and fixedly connected to the outside of the outer sliding plate, the side sliding plates are slidably connected to the side connection boxes, springs are fixedly connected to the top and bottom of the side sliding plates, one end of the spring is fixedly connected to the side connection box, limiting slide rods are symmetrically slidably connected to the inside of the side sliding plates, and the limiting slide rods are fixedly connected to the side connection boxes.

[0008] As a preferred solution of the present invention: A support top frame is fixedly connected to the top of the side connection box, and an infrared rangefinder cooperating with the self-sealing rod is installed inside the support top frame.

[0009] As a preferred embodiment of the present invention: One - way exhaust holes are symmetrically opened inside the full - pipe detection box. Two - way exhaust holes are symmetrically opened inside both the full - pipe detection box and the fixed top box. Three - way exhaust holes are symmetrically opened at the top of the fixed top box.

[0010] As a preferred embodiment of the present invention: A sampling pipe is fixedly connected to the refrigerant circulation pipe. A seventh solenoid valve is installed on the sampling pipe. Two first solenoid valves are installed on the third connecting pipe. A sixth solenoid valve is installed on the second connecting pipe. A fifth solenoid valve is installed on the refrigerant outlet pipe.

[0011] As a preferred embodiment of the present invention: A second solenoid valve is installed on the refrigerant inlet pipe.

[0012] As a preferred embodiment of the present invention: A third solenoid valve is installed on the connecting outlet pipe.

[0013] A device for realizing on - line precise blending of refrigerant, comprising the following steps:

[0014] S1. Different types of refrigerants are stored in each refrigerant storage tank. The blending pipe is evacuated through a vacuum - pumping pipe connected to a vacuum - pumping device. The refrigerant in the refrigerant storage tank enters the first connecting pipe through the connecting outlet pipe, enters the refrigerant inlet pipe through the first connecting pipe, is transported to the blending pipe through the refrigerant inlet pipe, and different types of refrigerants in each refrigerant storage tank are transported to the blending pipe for mixing. When refrigerant enters the blending pipe, the through - hole opened at the top of the blending pipe will push the piston by the refrigerant pressure. The piston drives the limit slide plate and the self - sealing rod to move upward. The moving position of the self - sealing rod is monitored by an infrared rangefinder.

[0015] S2. The self - sealing rod drives the outer sliding plate and the side sliding plate on the outside to move. The side sliding plate presses the spring at the top and pulls the spring at the bottom. When the blending pipe is not full, the medium flow generates turbulence or a local vacuum area. The self - sealing rod is driven by negative pressure to act, and the linkage switch outputs a signal to open the second solenoid valve to connect it to the gas of the refrigerant storage tank, and the fifth solenoid valve in front of the flowmeter is closed.

[0016] S3. At the same time, the output end of the motor drives one of the mixing shafts to rotate. One of the mixing shafts drives one of the gears on the outside to rotate. The gear drives the meshing gear to rotate. The three mixing shafts rotate synchronously to mix the refrigerant in the blending pipe until the medium in the blending pipe is completely filled, without bubbles or voids, and the flow is stable. At this time, the second solenoid valve is closed and the fifth solenoid valve on the refrigerant outlet pipe is opened. The fluid is metered by the flowmeter to eliminate the metering error.

[0017] S4. The refrigerant in the refrigerant outlet pipe enters the third connecting pipe through the second connecting pipe, enters the required refrigerant flow pipe through the third connecting pipe, and undergoes refrigerant blending addition treatment. The refrigerant in the refrigerant flow pipe is sampled and detected through the sampling pipe, and precise blending treatment is performed on the refrigerant as needed.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a piston, a limit sliding plate, a self-sealing rod, and an adjusting screw rod, the present invention realizes the rotational adjustment of the adjusting screw rod by rotating the rotating knob. The outer side connection box is driven by the adjusting screw rod to slide within the self-sealing rod, adjusting the position of the piston, controlling and adjusting the amount of refrigerant in the blending pipe and the full pipe detection box. The metering of the refrigerant is completed through the blending pipe and the full pipe detection box, and the metering error is eliminated. By setting a mixing shaft and gears, when one mixing shaft rotates, it drives the outer gear to rotate. When one gear rotates, it can drive the meshing gear to rotate, and the three gears drive the inner mixing shaft to rotate within the blending pipe, completing the mixing of the refrigerant within the blending pipe, improving the accuracy of blending. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 for the present invention Figure 1 is an enlarged view of part A;

[0021] Figure 3 for the present invention Figure 1 is an enlarged view of part B.

[0022] In the figure: 1, blending pipe; 2, refrigerant outlet pipe; 3, mixing shaft; 4, fixed side box; 5, first solenoid valve; 6, gear; 7, motor; 8, refrigerant inlet pipe; 9, second solenoid valve; 10, first connecting pipe; 11, connecting outlet pipe; 12, refrigerant storage tank; 13, third solenoid valve; 14, evacuation pipe; 15, evacuation equipment; 16, fourth solenoid valve; 17, second connecting pipe; 18, fifth solenoid valve; 19, sixth solenoid valve; 20, third connecting pipe; 21, refrigerant flow pipe; 22, seventh solenoid valve; 23, sampling pipe; 24, through hole; 25, full pipe detection box; 26, first exhaust hole; 27, limit sliding plate; 28, piston; 29, self-sealing rod; 30, adjusting screw rod; 31, fixed top box; 32, second exhaust hole; 33, third exhaust hole; 34, rotating knob; 35, support top frame; 36, infrared rangefinder; 37, side connection box; 38, outer sliding plate; 39, side sliding plate; 40, spring; 41, limit sliding rod; 42, flowmeter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1 to 3 , the present invention provides a technical solution: a device for realizing on-line precise blending of refrigerants, including a blending pipe 1. One side of the blending pipe 1 is fixedly connected to a refrigerant inlet pipe 8. One end of the refrigerant inlet pipe 8 is fixedly connected to a first communication pipe 10. A plurality of connecting outlet pipes 11 are fixedly connected to the bottom of the first communication pipe 10 at equal intervals. The bottom end of the connecting outlet pipe 11 is fixedly connected to a refrigerant storage tank 12. Three mixing shafts 3 are rotatably connected to the inside of the blending pipe 1 at equal intervals. A through hole 24 is opened at the top of the blending pipe 1. A full pipe detection box 25 is fixedly connected to the top of the blending pipe 1. A piston 28 is slidably connected to the inside of the full pipe detection box 25. A limit slide plate 27 is fixedly connected to the top of the piston 28. A self-sealing rod 29 is slidably connected to the outside of the limit slide plate 27. A fixed top box 31 is fixedly connected to the top of the full pipe detection box 25. The self-sealing rod 29 is slidably connected to the fixed top box 31 and the full pipe detection box 25. A refrigerant outlet pipe 2 is fixedly connected to the bottom of the blending pipe 1. A flow meter 42 is installed on the refrigerant outlet pipe 2. One end of the refrigerant outlet pipe 2 is fixedly connected to a second communication pipe 17. A plurality of third communication pipes 20 are fixedly connected to the second communication pipe 17. One end of the third communication pipe 20 is fixedly connected to a refrigerant circulation pipe 21. A vacuum extraction pipe 14 is fixedly connected to one side of the blending pipe 1. A vacuum extraction device 15 is installed at one end of the vacuum extraction pipe 14. A fourth solenoid valve 16 is installed on the vacuum extraction pipe 14. The inside of the blending pipe 1 is subjected to vacuum extraction treatment through the vacuum extraction pipe 14 connected to the vacuum extraction device 15 to prevent gas from entering the blending pipe 1 and affecting the blending measurement of the coolant.

[0025] Among them, a fixed side box 4 is fixedly connected to one side of the blending pipe 1. All three mixing shafts 3 are rotatably connected to the fixed side box 4. Gears 6 are fixedly connected to the outside of all three mixing shafts 3. The three gears 6 are meshed with each other. A motor 7 is installed on one side of the fixed side box 4. One end of one of the mixing shafts 3 is fixedly connected to the output end of the motor 7. One of the mixing shafts 3 is driven to rotate by the output end of the motor 7. One of the gears 6 on the outside of one of the mixing shafts 3 is driven to rotate. The other two meshed gears 6 are driven to rotate synchronously through the gear 6, completing the rotation adjustment of the three mixing shafts 3.

[0026] Among them, an adjusting screw rod 30 is internally threadedly connected to the limit sliding plate 27. The adjusting screw rod 30 is rotationally connected to the self-sealing rod 29. The top of the self-sealing rod 29 is rotationally connected to a rotating knob 34. The top end of the adjusting screw rod 30 is fixedly connected to the rotating knob 34. By rotating the rotating knob 34 to adjust the rotation of the adjusting screw rod 30, the positions of the limit sliding plate 27 and the piston 28 in the full pipe detection box 25 are adjusted.

[0027] Among them, side connection boxes 37 are symmetrically and fixedly connected inside the fixed top box 31. An outer sliding plate 38 is fixedly connected to the outer side of the self-sealing rod 29. The outer sliding plate 38 is slidably connected to the fixed top box 31. Side sliding plates 39 are symmetrically and fixedly connected to the outer side of the outer sliding plate 38. The side sliding plates 39 are slidably connected to the side connection boxes 37. Springs 40 are fixedly connected to both the top and bottom of the side sliding plates 39. One end of the spring 40 is fixedly connected to the side connection box 37. Limit sliding rods 41 are symmetrically and slidably connected inside the side sliding plates 39. The limit sliding rods 41 are fixedly connected to the side connection boxes 37. Springs 40 are provided at both the top and bottom of the side sliding plates 39. The positions of the side sliding plates 39, the outer sliding plate 38, and the self-sealing rod 29 are stabilized by the springs 40, facilitating the observation of the mixing pipe 1 and the inside of the full pipe detection box 25 through the self-sealing rod 29.

[0028] Among them, a support top frame 35 is fixedly connected to the top of the side connection box 37. An infrared rangefinder 36 that cooperates with the self-sealing rod 29 is installed inside the support top frame 35. Through the cooperation between the infrared rangefinder 36 and the self-sealing rod 29, the refrigerant conditions inside the mixing pipe 1 and the full pipe detection box 25 are observed.

[0029] Among them, first exhaust holes 26 are symmetrically opened inside the full pipe detection box 25. Second exhaust holes 32 are symmetrically opened inside both the full pipe detection box 25 and the fixed top box 31. Third exhaust holes 33 are symmetrically opened at the top of the fixed top box 31. The inside of the fixed top box 31 is exhausted through the third exhaust holes 33, and the inside of the fixed top box 31 and the full pipe detection box 25 are exhausted through the second exhaust holes 32 and the first exhaust holes 26, enabling the piston 28 to move smoothly inside the full pipe detection box 25.

[0030] Among them, a sampling pipe 23 is fixedly connected to the refrigerant circulation pipe 21. A seventh solenoid valve 22 is installed on the sampling pipe 23. Two first solenoid valves 5 are installed on the third connecting pipe 20. A sixth solenoid valve 19 is installed on the second connecting pipe 17. A fifth solenoid valve 18 is installed on the refrigerant outlet pipe 2. The connection state of the second connecting pipe 17 is controlled through the sixth solenoid valve 19, and the connection state of the refrigerant outlet pipe 2 is controlled through the fifth solenoid valve 18.

[0031] Among them, a second solenoid valve 9 is installed on the refrigerant inlet pipe 8, and the connection state of the refrigerant inlet pipe 8 is controlled through the second solenoid valve 9.

[0032] Among them, a third solenoid valve 13 is installed on the connecting outlet pipe 11, and the connection state of the connecting outlet pipe 11 is controlled through the third solenoid valve 13.

[0033] A device for realizing on-line precise blending of refrigerants includes the following steps:

[0034] S1. Different types of refrigerants are stored in each refrigerant storage tank 12. The mixing pipe 1 is evacuated through the evacuation pipe 14 connected to the evacuation equipment 15. The refrigerant in the refrigerant storage tank 12 enters the first connecting pipe 10 through the connecting outlet pipe 11, enters the refrigerant inlet pipe 8 through the first connecting pipe 10, is transported to the mixing pipe 1 through the refrigerant inlet pipe 8, and different types of refrigerants in each refrigerant storage tank 12 are transported to the mixing pipe 1 for mixing. When the refrigerant enters the mixing pipe 1, the through hole 24 opened at the top of the mixing pipe 1 will push the piston 28 by the refrigerant pressure, and the piston 28 drives the limit slide plate 27 and the self-sealing rod 29 to move upward. The moving position of the self-sealing rod 29 is monitored through the infrared rangefinder 36;

[0035] S2. The self-sealing rod 29 drives the outer sliding plate 38 and the side sliding plate 39 on the outside to move. The side sliding plate 39 presses the spring 40 at the top and pulls the spring 40 at the bottom. When the mixing pipe 1 is not full, the medium flow generates turbulence or a local vacuum area, and the self-sealing rod 29 is driven to act through negative pressure. The linkage switch outputs a signal to open the second solenoid valve 9 to make it gas-connected to the refrigerant storage tank 12, and the fifth solenoid valve 18 in front of the flowmeter 42 is closed;

[0036] S3. At the same time, the output end of the motor 7 drives one of the mixing shafts 3, one of the mixing shafts 3 drives one of the gears 6 on the outside, the gear 6 drives the meshing gear 6 to rotate, and the three mixing shafts 3 rotate synchronously to mix the refrigerant in the mixing pipe 1 until the medium in the mixing pipe 1 is completely filled, without bubbles or voids, and the flow is stable. At this time, the second solenoid valve 9 is closed and the fifth solenoid valve 18 on the refrigerant outlet pipe 2 is opened, and the fluid is metered through the flowmeter 42 to eliminate the metering error;

[0037] S4. The refrigerant in the refrigerant outlet pipe 2 enters the third connecting pipe 20 through the second connecting pipe 17, enters the required refrigerant flow pipe 21 through the third connecting pipe 20, and the refrigerant blending addition process is carried out. The refrigerant in the refrigerant flow pipe 21 is sampled and detected through the sampling pipe 23, and the refrigerant is precisely blended according to the needs.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0039] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0040] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus for realizing on-line precise blending of refrigerants, characterized in that, It includes a mixing pipe (1), one side of the mixing pipe (1) is fixedly connected to a refrigerant inlet pipe (8), one end of the refrigerant inlet pipe (8) is fixedly connected to a first connecting pipe (10), the bottom of the first connecting pipe (10) is fixedly connected with a plurality of connecting outlet pipes (11) at equal intervals, the bottom end of the connecting outlet pipe (11) is fixedly connected to a refrigerant storage tank (12), the inside of the mixing pipe (1) is rotatably connected with three mixing shafts (3) at equal intervals, a through hole (24) is opened at the top of the mixing pipe (1), a full pipe detection box (25) is fixedly connected to the top of the mixing pipe (1), a piston (28) is slidably connected inside the full pipe detection box (25), a limiting slide plate (27) is fixedly connected to the top of the piston (28), a self-sealing rod (29) is slidably connected to the outside of the limiting slide plate (27), a fixed top box (31) is fixedly connected to the top of the full pipe detection box (25), the self-sealing rod (29) is slidably connected with the fixed top box (31) and the full pipe detection box (25), the bottom of the mixing pipe (1) is fixedly connected to a refrigerant outlet pipe (2), a flow meter (42) is installed on the refrigerant outlet pipe (2), one end of the refrigerant outlet pipe (2) is fixedly connected to a second connecting pipe (17), a plurality of third connecting pipes (20) are fixedly connected to the second connecting pipe (17), one end of the third connecting pipe (20) is fixedly connected to a refrigerant circulation pipe (21), one side of the mixing pipe (1) is fixedly connected to a vacuum extraction pipe (14), a vacuum extraction device (15) is installed at one end of the vacuum extraction pipe (14), and a fourth solenoid valve (16) is installed on the vacuum extraction pipe (14).

2. The device for realizing on-line precise blending of refrigerant according to claim 1, characterized in that: One side of the mixing pipe (1) is fixedly connected to a fixed side box (4), all three mixing shafts (3) are rotatably connected to the fixed side box (4), gears (6) are fixedly connected to the outside of all three mixing shafts (3), the three gears (6) are meshed with each other, a motor (7) is installed on one side of the fixed side box (4), and one end of one of the mixing shafts (3) is fixedly connected to the output end of the motor (7).

3. The device for realizing online precise blending of refrigerant according to claim 2, wherein: An adjusting screw rod (30) is threadedly connected to the inside of the limiting slide plate (27), the adjusting screw rod (30) is rotatably connected to the self-sealing rod (29), a rotating knob (34) is rotatably connected to the top of the self-sealing rod (29), and the top end of the adjusting screw rod (30) is fixedly connected to the rotating knob (34).

4. The device for realizing precise online blending of refrigerant according to claim 3, characterized in that: Inside the fixed top box (31), side connection boxes (37) are symmetrically and fixedly connected. An outer sliding plate (38) is fixedly connected to the outside of the self-sealing rod (29). The outer sliding plate (38) is slidably connected to the fixed top box (31). Side sliding plates (39) are symmetrically and fixedly connected to the outside of the outer sliding plate (38). The side sliding plates (39) are slidably connected to the side connection boxes (37). Springs (40) are fixedly connected to both the top and bottom of the side sliding plates (39). One end of the springs (40) is fixedly connected to the side connection boxes (37). Limit sliding rods (41) are symmetrically and slidably connected to the inside of the side sliding plates (39). The limit sliding rods (41) are fixedly connected to the side connection boxes (37).

5. The device for realizing online precise blending of refrigerant according to claim 4, characterized in that: A support top frame (35) is fixedly connected to the top of the side connection box (37). An infrared distance measuring instrument (36) that cooperates with the self-sealing rod (29) is installed inside the support top frame (35).

6. The device for realizing online precise blending of refrigerant according to claim 5, characterized in that: First exhaust holes (26) are symmetrically formed inside the full pipe detection box (25). Second exhaust holes (32) are symmetrically formed inside both the full pipe detection box (25) and the fixed top box (31). Third exhaust holes (33) are symmetrically formed in the top of the fixed top box (31).

7. The device for realizing precise online blending of refrigerant according to claim 6, wherein: A sampling pipe (23) is fixedly connected to the refrigerant circulation pipe (21). A seventh solenoid valve (22) is installed on the sampling pipe (23). Two first solenoid valves (5) are installed on the third communication pipe (20). A sixth solenoid valve (19) is installed on the second communication pipe (17). A fifth solenoid valve (18) is installed on the refrigerant outlet pipe (2).

8. An apparatus for realizing on-line precise blending of refrigerants according to claim 7, characterized in that: A second solenoid valve (9) is installed on the refrigerant inlet pipe (8).

9. The device for realizing online precise blending of refrigerant according to claim 8, characterized in that: A third solenoid valve (13) is installed on the connection outlet pipe (11).

10. A device for realizing online precise blending of refrigerants according to any one of claims 1-9, characterized in that, Including the following steps: S1. Different types of refrigerants are stored in each refrigerant storage tank (12). The mixing pipe (1) is evacuated through the evacuation pipe (14) connected to the evacuation device (15). The refrigerant in the refrigerant storage tank (12) enters the first communication pipe (10) through the connection outlet pipe (11), enters the refrigerant inlet pipe (8) through the first communication pipe (10), is transported to the mixing pipe (1) through the refrigerant inlet pipe (8), and different types of refrigerants in each refrigerant storage tank (12) are transported to the mixing pipe (1) for mixing. When refrigerant enters the mixing pipe (1), the through hole (24) formed in the top of the mixing pipe (1) will push the piston (28) by the refrigerant pressure. The piston (28) drives the limit sliding plate (27) and the self-sealing rod (29) to move upward. The moving position of the self-sealing rod (29) is monitored by the infrared distance measuring instrument (36). S2. The self-sealing rod (29) drives the outer outer sliding plate (38) and the side sliding plate (39) to move. The side sliding plate (39) presses the spring (40) at the top and pulls the spring (40) at the bottom. When the blending pipe (1) is not full, the medium flow generates turbulence or a local vacuum area, and the self-sealing rod (29) is driven to act through negative pressure. The linkage switch outputs a signal to open the second solenoid valve (9) to make it gas-connected to the refrigerant storage tank (12), and the fifth solenoid valve (18) in front of the flowmeter (42) is closed; S3. At the same time, the output end of the motor (7) drives one of the mixing shafts (3) to rotate. One of the mixing shafts (3) drives one of the outer gears (6) to rotate. The gear (6) drives the meshing gear (6) to rotate. The three mixing shafts (3) rotate synchronously to mix the refrigerant in the blending pipe (1) until the medium in the blending pipe (1) is completely filled, without bubbles or voids, and the flow is stable. At this time, the second solenoid valve (9) is closed and the fifth solenoid valve (18) on the refrigerant outlet pipe (2) is opened. The fluid is metered by the flowmeter (42) to eliminate the metering error; S4. The refrigerant in the refrigerant outlet pipe (2) enters the third connecting pipe (20) through the second connecting pipe (17), enters the required refrigerant circulation pipe (21) through the third connecting pipe (20), and performs the refrigerant blending and adding process. The refrigerant in the refrigerant circulation pipe (21) is sampled and detected through the sampling pipe (23), and the refrigerant is precisely blended according to the needs.

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