Refrigerant injection and discharge mechanism, refrigeration device and pipe production line

Abstract

The invention provides a refrigerant injection and discharge mechanism, a refrigeration device and a pipe production line, and belongs to the technical field of refrigeration equipment. The injection and drainage mechanism comprises an air storage tank and a pressure adjusting assembly. An air inlet pipe is arranged at the upper end of the air storage tank, and an exhaust pipe is arranged at the lower end of the air storage tank; the compressor is arranged on one side of the air storage tank, and an air suction port of the compressor communicates with the exhaust pipe through a first pipeline. The pressure sensor is mounted on the first pipeline and can monitor the pressure of a refrigerant about to enter the compressor in real time; the pressure adjusting assembly is arranged in the gas storage tank, and when the pressure sensor monitors that the pressure in the first pipeline is lower than the set pressure intensity, the opening and closing unit is opened, so that a refrigerant in the gas storage tank flows into the first pipeline; and when the pressure sensor monitors that the pressure in the first pipeline is higher than the set pressure intensity, the opening and closing unit opens the reverse channel, and redundant refrigerant is pumped back into the air storage tank until the pressure intensity in the first pipeline is recovered to the set pressure intensity. The method has the advantage of being capable of accurately controlling the injection and discharge amount of the refrigerant.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling and temperature reduction, and more specifically, relates to a refrigerant injection and discharge mechanism, a refrigeration device and a pipe production line. Background Art

[0002] Refrigeration devices play an indispensable role in many areas of modern industry and daily life, and are widely used in food refrigeration, air conditioning systems, chemical process cooling, etc. As the requirements for refrigeration stability and efficiency in various industries continue to rise, the performance optimization of refrigeration devices has become a key research and development direction.

[0003] Traditional refrigeration devices have many drawbacks in terms of refrigerant filling. Early refrigeration systems mostly relied on manual regular checks of refrigerant remaining levels and refilling through manually operated valves. This method not only consumed a lot of manpower costs, but was also cumbersome and inefficient. Operators need to have professional knowledge and experience to accurately judge the timing of refilling. Any carelessness, such as over- or under-filling, will have a serious impact on the performance of the refrigeration system. Over-filling may cause excessive load on the compressor, resulting in energy waste, increased equipment wear and even malfunction and shutdown; insufficient filling cannot meet the refrigeration demand, reduce the refrigeration effect, and affect the production process or comfort of use.

[0004] In recent years, although some refrigeration systems have introduced the concept of automatic control to a certain extent, the existing technology still has shortcomings. For example: a Chinese patent discloses an energy-saving refrigeration device with automatic refrigerant filling (authorization announcement number: CN118757955 A), which includes a refrigerant filling component, a heat recovery device and an intelligent control system. The heat recovery device is used to recover the waste heat generated during the refrigeration cycle. The heat recovery device is connected to the condenser to absorb the heat emitted by the condenser and transport it to the evaporator or other components that need heat supply; the intelligent control system includes a temperature sensor and a pressure sensor. The temperature sensor monitors the temperature of the heat storage medium in the heat recovery device in real time; the pressure sensor is installed on the refrigerant container of the refrigerant; the refrigerant filling component includes a refrigerant buffer tank and an on-off valve connected thereto. The pressure in the buffer tank is higher than the set pressure in the refrigerant container. When the pressure in the refrigerant container is lower than the set pressure, the refrigerant is replenished. Although it is moving towards automation and has been optimized in the refrigerant supply link, there is still no comprehensive solution for how to achieve dynamic and precise injection and discharge of refrigerant based on the coordination of multiple parameters such as compressor suction pressure and evaporator heat exchange efficiency under complex and changeable working conditions. Summary of the invention

[0005] The object of the present invention is to provide a refrigerant injection and discharge mechanism, a refrigeration device and a pipe production line to solve the technical problem of inaccurate refrigerant injection and discharge amounts existing in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a refrigerant injection and discharge mechanism including a gas storage tank, a compressor, a pressure sensor and a pressure regulating assembly. The gas storage tank is provided with an air inlet pipe at the upper end and an exhaust pipe at the lower end, and an opening and closing unit is provided in the exhaust pipe; the compressor is arranged on one side of the gas storage tank, and its air intake is connected with the exhaust pipe through a first pipe; the pressure sensor is installed on the first pipe to monitor the pressure of the refrigerant about to enter the compressor in real time; the pressure regulating assembly is arranged in the gas storage tank, and when the pressure sensor detects that the pressure in the first pipe is lower than the set pressure, the opening and closing unit opens to allow the refrigerant in the gas storage tank to flow into the first pipe; when the pressure sensor detects that the pressure in the first pipe is higher than the set pressure, the opening and closing unit opens the reverse channel to pump the excess refrigerant back into the gas storage tank until the pressure in the first pipe returns to the set pressure.

[0007] In combination with the above technical solution, in a possible implementation method, the opening and closing unit includes a Tesla valve and a regulating valve; the Tesla valve is horizontally arranged, and its air inlet end is connected to the exhaust pipe, and the air outlet end is connected to the first pipeline before the pressure sensor; one end of the regulating valve is connected to the air inlet end of the Tesla valve, and the other end is connected to the first pipeline between the Tesla valve and the pressure sensor, and the regulating valve and the Tesla valve form a parallel structure.

[0008] In combination with the above technical solution, in a possible implementation, the regulating valve is a visually adjustable pressure difference bypass valve.

[0009] In combination with the above technical solution, in a possible implementation, the pressure regulating assembly includes a screw, a slider, an airbag, an elastic baffle and a non-Newtonian fluid baffle. The screw is vertically arranged in the gas tank, and the upper end is threadedly connected to the top of the gas tank and penetrates through it, and then connected to the driving member, and the screw rotates under the action of the driving member; the slider is arranged in the gas tank below the screw, the upper end of the slider is rotatably connected to the lower end of the screw, and the side surface of the slider is slidably connected to the inner wall of the gas tank; the airbag is arranged below the slider; two elastic baffles are arranged in parallel below the airbag, and the edge of each elastic baffle is provided with a hard retaining ring that slides with the inner wall of the gas tank, and a non-Newtonian fluid baffle is arranged between the two elastic baffles, and a shear-hardened non-Newtonian fluid is arranged in the non-Newtonian fluid baffle.

[0010] In combination with the above technical solution, in a possible implementation, a temperature sensor is also provided on the Tesla valve.

[0011] In combination with the above technical solution, in a possible implementation, the injection and discharge mechanism also includes a controller, and the controller is electrically connected to the pressure sensor, the temperature sensor, the pressure regulating component and the opening and closing unit.

[0012] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a refrigeration device, including a condenser, a throttling device, an evaporator and the above-mentioned refrigerant injection and discharge mechanism, the refrigerant injection and discharge mechanism is connected to the low-pressure suction pipeline between the evaporator and the compressor, and is used to pump refrigerant into the compressor.

[0013] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a pipe production line, including an extruder, a shaping device, a cooling device, a traction device and the above-mentioned refrigeration device, the extruder is used to extrude the raw materials into a pipe-shaped structure, the shaping device shapes the extruded pipe, the cooling device cools the pipe, the traction device pulls the pipe through the shaping device and the cooling device in sequence, and the refrigeration device provides cooling water for the cooling device.

[0014] The beneficial effects of the refrigerant injection and discharge mechanism, refrigeration device and pipe production line provided by the present invention are: compared with the prior art, the present invention monitors the refrigerant pressure in the first pipe installed in front of the compressor suction port in real time through a pressure sensor. When the system operates normally and the pressure is stable within the set range, the opening and closing unit in the exhaust pipe of the gas storage tank maintains the current state, and the refrigeration cycle is carried out according to the conventional process. When the pressure sensor captures that the pressure in the first pipe is lower than the set pressure, it means that the refrigerant in the refrigeration system is lost and needs to be replenished. At this time, the opening and closing unit located in the exhaust pipe of the gas storage tank is opened, and the gaseous refrigerant pre-stored in the air inlet pipe at the upper end of the gas storage tank flows to the first pipe through the exhaust pipe under the action of the pressure difference, and is replenished to the refrigeration cycle in time to ensure that the refrigeration capacity of the system does not decrease. On the contrary, if the pressure is higher than the set pressure, it indicates that the refrigerant is excessive, the opening and closing unit opens the reverse channel, and pumps the excess refrigerant back to the gas storage tank until the pressure in the first pipe returns to the set value to ensure the pressure balance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the structure of the refrigerant injection and discharge mechanism provided in an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the opening and closing unit provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the pressure regulating assembly provided in an embodiment of the present invention; Figure 4 A schematic diagram of the cross-sectional structure of the Tesla valve provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a cooling device provided by an embodiment of the present invention; Figure 6 A schematic structural diagram of the cooling slot mechanism provided in an embodiment of the present invention; Figure 7 A schematic diagram of the structure of the liquid storage mechanism provided in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of the filter assembly provided in an embodiment of the present invention; Fig. 9 A schematic diagram of the structure of the filter assembly provided in an embodiment of the present invention; Fig.10 A schematic diagram of the position structure of the sleeve, spring and lifting rod provided in an embodiment of the present invention; Fig.11 A schematic diagram of the structure of the fourth pipeline provided in an embodiment of the present invention Among them, the reference numerals in the figures are as follows: 10. Gas tank; 11. Air intake pipe; 12. Exhaust pipe; 20. compressor; 21. first pipeline; 30. Pressure sensor; 40. pressure regulating assembly; 41. screw; 42. slider; 43. airbag; 44. elastic diaphragm; 45. driving member; 46. hard retaining ring; 47. non-Newtonian fluid diaphragm; 50. Opening and closing unit; 51. Tesla valve; 52. Regulating valve; 53. Temperature sensor; 60. Controller; 10. Cooling tank mechanism; 101. Cooling tank; 102. Frame; 103. Guide wheel; 104. Nozzle; 20. Liquid storage mechanism; 21. Liquid storage tank; 211. Slow flow chamber; 212. Filter chamber; 22. Connecting pipe; 30. Refrigeration equipment; 40. Pumping mechanism; 50. Filter assembly; 51. Filter plate; 52. Brush plate; 53. Brush; 54. Discharge chamber; 55. Storage box; 56. Diverter; 60. reciprocating assembly; 61. reciprocating screw; 62. first motor; 63. connecting plate; 64. sleeve; 65. lifting rod; 66. spring; 67. guide rod; 70, first pipeline; 701, second main pipeline; 702, third branch pipeline; 704, fourth branch pipeline; 72, second pipeline; 73, third pipeline; 74, fourth pipeline; 741, first main pipeline; 742, first branch pipeline; 743, second branch pipeline; 75, liquid return tank; 76, fifth branch pipeline. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0018] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0019] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0020] The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. The directions or positional relationships indicated by the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0022] The refrigerant injection and discharge mechanism, refrigeration device and pipe production line provided by the present invention are now described.

[0023] like Figure 1 and Figure 2As shown, the first embodiment of the present invention provides a refrigerant injection and discharge mechanism including a gas storage tank 10, a compressor 20, a pressure sensor 30 and a pressure regulating assembly 40. The gas storage tank 10 is provided with an air inlet pipe 11 at the upper end and an exhaust pipe 12 at the lower end, and an opening and closing unit 50 is provided in the exhaust pipe 12; the compressor 20 is arranged on one side of the gas storage tank 10, and its air intake is connected to the exhaust pipe 12 through a first pipe 21; the pressure sensor 30 is installed on the first pipe 21 to monitor the pressure of the refrigerant about to enter the compressor 20 in real time; the pressure regulating assembly 40 is arranged in the gas storage tank 10, when the pressure sensor 30 detects that the pressure in the first pipe 21 is lower than the set pressure, the opening and closing unit 50 is opened to allow the refrigerant in the gas storage tank 10 to flow into the first pipe 21; when the pressure sensor 30 detects that the pressure in the first pipe 21 is higher than the set pressure, the opening and closing unit 50 opens the reverse channel to pump the excess refrigerant back into the gas storage tank 10 until the pressure in the first pipe 21 is restored to the set pressure.

[0024] The refrigerant injection and discharge mechanism provided in this embodiment is compared with the prior art. The gas storage tank 10 on the gas storage tank 10 in the present invention is used to store gaseous refrigerant, the air inlet pipe 11 is used to replenish the gaseous refrigerant in the gas storage tank 10, the exhaust pipe 12 is connected to the compressor 20 through the first pipe 21, and the exhaust pipe 12 is provided with an opening and closing unit 50. The state of the opening and closing unit 50 controls the gaseous refrigerant in the gas storage tank 10 to flow into or out of the compressor 20. The pressure sensor 30 monitors the refrigerant pressure in the first pipe 21 installed in front of the air intake port of the compressor 20 in real time, and transmits the monitored pressure signal to the opening and closing unit 50, thereby controlling the state of the opening and closing unit 50. When the refrigeration system operates normally and the pressure is stable within the set range, the opening and closing unit 50 in the exhaust pipe 12 of the gas storage tank 10 maintains the current state, and the refrigeration cycle is carried out according to the conventional process. When the pressure sensor 30 captures that the pressure in the first pipe 21 is lower than the set pressure, it means that the refrigerant in the refrigeration system is lost and needs to be replenished. At this time, the opening and closing unit 50 located in the exhaust pipe 12 of the gas storage tank 10 is opened, and the gaseous refrigerant pre-stored in the air inlet pipe 11 at the upper end of the gas storage tank 10 flows to the first pipeline 21 through the exhaust pipe 12 under the action of the pressure difference, and is replenished to the refrigeration cycle in time to ensure that the refrigeration capacity of the system does not decrease. On the contrary, if the pressure is higher than the set pressure, it indicates that the refrigerant is excessive, and the opening and closing unit 50 opens the reverse channel and pumps the excess refrigerant back to the gas storage tank 10 until the pressure in the first pipeline 21 returns to the set value, ensuring the pressure balance of the system, and realizing the automatic injection of refrigerant to ensure the stable operation of the refrigeration system.

[0025] like Figures 1 to 3As shown, a specific embodiment provided by the present invention on the basis of the first embodiment is as follows: the opening and closing unit 50 includes a Tesla valve 51 and a regulating valve 52. The Tesla valve 51 is arranged horizontally, and its air inlet end is connected to the exhaust pipe 12, and its air outlet end is connected to the first pipeline 21 before the pressure sensor 30; one end of the regulating valve 52 is connected to the air inlet end of the Tesla valve 51, and the other end is connected to the first pipeline 21 between the Tesla valve 51 and the pressure sensor 30, and the regulating valve 52 and the Tesla valve 51 form a parallel structure. The regulating valve 52 is a visually adjustable pressure difference bypass valve. A temperature sensor 53 is also arranged on the Tesla valve 51.

[0026] The Tesla valve 51 is arranged on the first pipe 21 between the air outlet of the gas storage tank 10 and the air suction line of the compressor 20, and serves as a key component for controlling the refrigerant to flow forward to the compressor 20 and flow back to the gas storage tank 10. The air inlet end of the Tesla valve 51 is tightly connected to the air outlet of the gas storage tank 10 through a short and straight metal pipe in a threaded connection to ensure the sealing of the connection and prevent refrigerant leakage; the air outlet end of the Tesla valve 51 is connected to the first pipe 21 before the pressure sensor 30 in the same firm manner, so that the refrigerant can flow smoothly into the air suction port of the compressor 20. The Tesla valve 51 is installed horizontally as a whole to ensure that the fluid follows the designed flow characteristics in its internal channel and reduce the abnormal flow resistance caused by improper installation angle. A temperature sensor 53 is installed on the outer shell of the Tesla valve 51 to monitor the temperature of the refrigerant passing through the valve in real time.

[0027] One end of the regulating valve 52 is connected to the air inlet end of the Tesla valve 51 through a rubber tube resistant to refrigerant corrosion, and the other end is also connected to the first pipeline 21 between the Tesla valve 51 and the pressure sensor 30 through a rubber tube resistant to refrigerant corrosion. The connection is fastened by a pipe clamp to ensure sealing and facilitate disassembly and maintenance. The pipeline connected to the front and rear of the regulating valve 52 forms a bypass pipeline, and the pipeline adjacent to the front and rear of the Tesla valve 51 forms a main pipeline. The main pipeline and the bypass pipeline form a parallel structure, which is convenient for allowing part of the refrigerant to bypass the Tesla valve 51 and directly return when the refrigerant reflux volume needs to be finely adjusted.

[0028] When the refrigeration system is operating normally and needs to transport refrigerant from the gas tank 10 to the compressor 20, the refrigerant flows out from the exhaust pipe 12 of the gas tank 10. Due to the small forward flow resistance of the Tesla valve 51, the refrigerant preferentially flows from the main line of the Tesla valve 51 to the compressor 20. At this time, the regulating valve 52 is in a closed state, and all the refrigerant enters the compressor 20 through the Tesla valve 51, ensuring that the system operates efficiently and meets the refrigeration needs.

[0029] When the refrigeration system detects an excess of refrigerant, such as when the pressure sensor 30 detects that the pressure in the first pipe 21 of the compressor 20 is too high, indicating that the refrigerant needs to be withdrawn, the controller 60 starts the reverse flow program.

[0030] First, due to its special structure, the Tesla valve 51 can produce a large resistance to reverse flow, but still allows a small amount of refrigerant to slowly reflux to preliminarily balance the refrigerant distribution in the system. At the same time, the controller 60 accurately calculates the required refrigerant flow rate based on the data fed back by the pressure, temperature and other sensors, and then opens the regulating valve 52 to allow a certain amount of refrigerant to quickly bypass the Tesla valve 51 through the regulating valve 52 and directly reflux to the gas storage tank 10. By adjusting the opening of the bypass line valve, the reflux volume can be finely controlled to make up for the problem of insufficient flow regulation accuracy of the Tesla valve 51, and to achieve precise adjustment of the refrigerant charge in the refrigeration system.

[0031] During the entire reverse reflux process, the temperature sensor 53 continuously monitors the refrigerant temperature at the Tesla valve 51. If an abnormal increase in temperature is found (possibly due to frictional heat generated by high-speed refrigerant reflux), the controller 60 can further fine-tune the bypass line valve opening or take other cooling measures to ensure safe and stable operation of the system.

[0032] like Figures 1 to 3 As shown, the present invention provides a specific embodiment based on the above embodiment as follows: the pressure regulating assembly 40 includes: a screw 41, a slider 42, an airbag 43 and an elastic partition 44. The screw 41 is vertically arranged in the gas storage tank 10, and the upper end is threadedly connected to the top of the gas storage tank 10 and penetrates through it, and is connected to the driving member 45. The screw 41 rotates under the action of the driving member 45; the slider 42 is arranged in the gas storage tank 10 below the screw 41, the upper end of the slider 42 is rotatably connected to the lower end of the screw 41, and the side surface of the slider 42 is slidably connected to the inner wall of the gas storage tank 10; the airbag 43 is arranged below the slider 42; two elastic partitions 44 are arranged in parallel below the airbag 43, and the edge of each elastic partition 44 is provided with a hard retaining ring 46 that slides with the inner wall of the gas storage tank 10, and a non-Newtonian fluid partition 47 is arranged between the two elastic partitions 44, and a shear-hardened non-Newtonian fluid is arranged in the non-Newtonian fluid partition 47.

[0033] When the refrigerant supply needs to be increased, the driving member 45 receives the instruction of the controller 60 and starts to operate, driving the screw 41 connected thereto to rotate. Since the screw 41 is vertically arranged in the gas storage tank 10 and the upper end is threadedly connected to the tank top, during its rotation, the screw 41 will generate a downward displacement trend due to the threaded structure. The slider 42 is arranged below the screw 41, and its upper end is rotatably connected to the lower end of the screw 41. This connection method allows the slider 42 to slide downward along the inner wall of the gas storage tank 10 driven by the screw 41. The sliding connection between the side surface of the slider 42 and the inner wall of the gas storage tank 10 ensures the stability and guidance of its movement.

[0034] As the slider 42 moves downward, the airbag 43 below the slider 42 is squeezed. The airbag 43 is made of a rubber material that is resistant to refrigerants, high temperatures, and aging, and has good elastic deformation capabilities. After the airbag 43 is compressed, its internal volume decreases and the gas pressure increases, acting as an "elastic pressure source" to drive the refrigerant in the gas tank 10 to flow to the exhaust pipe 12 at an accelerated speed, and then enter the first pipeline 21 through the opening and closing unit 50, replenishing the refrigerant in time and increasing the pressure in the first pipeline 21.

[0035] When it is necessary to reduce the refrigerant supply or even to draw part of the refrigerant back to the gas storage tank 10, the driving member 45 drives the screw 41 to reverse. The reverse rotation of the screw 41 drives the slider 42 to move upward, and the air bag 43 is decompressed accordingly, and the volume is gradually restored, and its squeezing force on the refrigerant is weakened.

[0036] At this time, the two elastic baffles 44 play a key role. The elastic baffles 44 are arranged parallel to the airbag 43, and the hard retaining ring 46 on the edge of each baffle is tightly slidably matched with the inner wall of the gas tank 10, ensuring the stable movement of the baffle in the vertical direction. During the process of the slider 42 moving up and the airbag 43 decompressing, if the system pressure is still higher than the normal range, the non-Newtonian fluid baffle 47 under the baffle begins to work.

[0037] The non-Newtonian fluid sac 47 is filled with a shear-hardened non-Newtonian fluid. When the refrigerant tends to flow back to the gas storage tank 10 due to the pressure difference, the fluid is squeezed by the partition. Due to the special properties of the non-Newtonian fluid, when it is sheared by external force, its viscosity will increase rapidly, forming a resistance barrier similar to a "solid state", effectively slowing down the reflux speed of the refrigerant and preventing the pressure from being out of control due to the instantaneous large-scale influx of the refrigerant into the gas storage tank 10 due to the pressure difference. As the pressure gradually balances, the shear force on the fluid decreases, the viscosity recovers, and the partition slowly resets under the action of its own elasticity and residual pressure, and the entire pressure regulating assembly 40 returns to its initial state.

[0038] In summary, through the linkage of components such as the screw 41, the slider 42, the airbag 43 and the elastic partition 44, the pressure regulating assembly 40 can achieve efficient and stable injection and discharge regulation of the refrigerant to ensure the smooth operation of the refrigeration system.

[0039] like Figures 1 to 3 As shown, the present invention provides a specific embodiment based on the first embodiment as follows: the injection and discharge mechanism also includes a controller 60, and the controller 60 is electrically connected to the pressure sensor 30, the temperature sensor 53, the pressure regulating component 40 and the opening and closing unit 50.

[0040] The setting of the temperature sensor 53 and the pressure sensor 30 helps to understand the state changes of the refrigerant and provide more data references for the controller 60. The controller 60 integrates the data of the pressure and temperature sensors 53 in real time, makes accurate decisions based on the algorithm, avoids the disadvantages of manual judgment, and ensures stable operation of the system, so as to accurately control the opening and closing unit 50 and the adjustment components under different working conditions and accurately control the refrigerant flow.

[0041] A refrigeration device provided in the second embodiment of the present invention includes a condenser, a throttling device, an evaporator and the above-mentioned refrigerant injection and discharge mechanism, and the refrigerant injection and discharge mechanism is connected to the low-pressure suction pipeline between the evaporator and the compressor 20, and is used to pump refrigerant into the compressor 20. First, the refrigerant injection and discharge mechanism can keep the evaporator in the best cooling state at all times, greatly improve the refrigeration efficiency, and achieve the purpose of rapid cooling. Secondly, the injection and discharge mechanism can accurately control the refrigerant flow according to the real-time pressure of the refrigeration system, and cooperate with the condenser and the throttling device to ensure that the entire refrigeration cycle is stable and smooth, and adapt to various working conditions.

[0042] A pipe production line provided in the third embodiment of the present invention includes an extruder, a shaping device, a cooling device, a traction device and the above-mentioned refrigeration device, wherein the extruder is used to extrude the raw material into a pipe-shaped structure, the shaping device shapes the extruded pipe, the cooling device cools the pipe, the traction device pulls the pipe through the shaping device and the cooling device in sequence, and the refrigeration device provides cooling water for the cooling device. Since the cooling water used in the cooling device of the pipe production line is cooling water cooled by the refrigeration device, compared with the prior art method of using normal temperature water to cool the pipe, the cooling efficiency is higher and the cooling speed is faster.

[0043] like Figures 1 to 3As shown, the present invention provides a specific embodiment based on the third embodiment as follows: the cooling device includes a cooling trough mechanism, a liquid storage mechanism, a refrigeration device and a pumping mechanism. The cooling trough mechanism is used to cool the pipe when the pipe passes through; the liquid storage mechanism is connected to the water outlet of the cooling trough mechanism through a pipeline; the liquid inlet end of the refrigeration device is connected to the liquid storage mechanism through a pipeline, and the liquid outlet end is connected to the liquid storage mechanism through a pipeline; the pumping mechanism is arranged on the pipeline between the liquid storage mechanism and the cooling trough mechanism, and is used to pump cold water into the cooling trough mechanism. The present invention ensures that a better cooling effect can be achieved on the pipe when the pipe passes through the cooling trough mechanism by adding a liquid storage mechanism and a refrigeration device connected to the cooling trough mechanism outside the cooling trough mechanism. The high-temperature hot water flowing out of the cooling tank first flows into the liquid storage tank, and then is pumped into the refrigeration device. The refrigeration device cools the hot water entering it, and the cooled water is mixed into the liquid storage tank again. In this process, the liquid storage tank plays a buffering and blending function, so that water of different temperatures is fully mixed, which can ensure that the water temperature pumped into the cooling tank is constant each time, and the cooling tank can always obtain cooling water at a suitable temperature, thereby stably cooling the pipe, and ensuring that there is sufficient water in the liquid storage tank for pumping at any time, which fully meets the large demand for cooling water during the continuous extrusion of the pipe, and eliminates the problem of untimely and insufficient cooling due to insufficient water.

[0044] like Figure 5 and Figure 7 As shown, the cooling device includes a cooling tank mechanism 10, a liquid storage mechanism 20 and a pumping mechanism 40. The cooling tank mechanism 10 is used to cool the pipe when the pipe passes through; the liquid storage mechanism 20 is connected to the water outlet of the cooling tank mechanism 10 through a first pipeline 70; the liquid inlet end of the refrigeration device 30 is connected to the liquid storage mechanism 20 through a second pipeline 72, and the liquid outlet end is connected to the liquid storage mechanism 20 through a third pipeline 73; the pumping mechanism 40 is provided on a fourth pipeline 74 between the liquid storage mechanism 20 and the cooling tank mechanism 10, and is used to pump cold water into the cooling tank mechanism 10.

[0045] Compared with the prior art, the pipe extrusion cooling device provided in this embodiment ensures that the pipe can have a better cooling effect when passing through the cooling tank mechanism 10 by adding a liquid storage mechanism 20 and a refrigeration device 30 connected to the cooling tank mechanism 10 outside the cooling tank mechanism 10. The high-temperature hot water flowing out of the cooling tank 101 first flows into the water storage tank, and then is pumped into the refrigeration device 30. The refrigeration device 30 cools the hot water entering it, and the cooled water is mixed into the water storage tank again. In this process, the water storage tank plays a buffering and blending function, so that water of different temperatures is fully mixed, which can ensure that the water temperature pumped into the cold water tank is constant each time, and the cooling tank 101 can always obtain cooling water of suitable temperature, thereby stably cooling the pipe, and ensuring that there is sufficient water in the water storage tank for pumping at any time, which fully meets the large demand for cooling water in the continuous extrusion process of the pipe, and eliminates the problem of untimely and insufficient cooling due to insufficient water.

[0046] The first pipeline 70, the second pipeline 72, the third pipeline 73 and the fourth pipeline 74 connecting the various mechanisms cooperate with the pumping mechanism 40 to form an efficient water circulation system. The pumping mechanism 40 accurately pumps the cold water prepared in the liquid storage mechanism 20 to the cooling tank mechanism 10 in a timely manner to ensure the smooth progress of the cooling operation. The layout of each pipeline is reasonable, which effectively reduces the energy loss in the water flow process and improves the energy efficiency ratio of the entire cooling device.

[0047] like Figure 6 As shown, the cooling trough mechanism 10 includes a cooling trough 101, a guide wheel 103 and a nozzle 104. The upper end of the cooling trough 101 is open, and the lower end is mounted on the frame 102. The cooling trough 101 is provided with an inlet and an outlet in sequence at both ends along the direction of the pipe material travel; a plurality of guide wheels 103 are rotatably arranged in the cooling trough 101 below the inlet, and are evenly distributed along the length direction of the cooling trough 101; a plurality of nozzles 104 are arranged in the cooling trough 101 above the inlet, and each nozzle 104 is tilted toward the outlet, and each nozzle 104 is connected to the liquid storage mechanism 20 through the fourth pipeline 74 and the pumping mechanism 40 thereon. The pumping mechanism 40 is a water pump. Two liquid return grooves 75 are respectively arranged on the cooling trough 101 below the inlet and outlet, and the top of each liquid return groove 75 is open, and the bottom of each liquid return groove 75 is connected to the end of the corresponding second main pipe 701 through the fifth branch pipe 76.

[0048] During operation, on the one hand, the low-temperature water in the liquid storage mechanism 20 is extracted and transported to the nozzle 104 through the fourth pipeline 74 through the action of the pumping mechanism 40, and the nozzle 104 injects cooling water into the cooling tank 101. Since each nozzle 104 is tilted toward the outlet, the circulation speed of the cooling water in the cooling tank 101 will be accelerated during the process of the nozzle 104 spraying cooling water; on the other hand, the pipe enters the cooling tank 101 from the pipe inlet at one end of the cooling tank 101 under the action of the traction mechanism, and the pipe begins to enter the cooling treatment link. The multiple guide wheels 103 located in the cooling tank 101 below the pipe inlet and evenly distributed along the length direction of the cooling tank 101 will support and guide the pipe entering the cooling tank 101, ensuring that the pipe can move smoothly along the length direction of the cooling tank 101 toward the outlet, reducing the deviation and jamming of the pipe during the movement, and realizing efficient and continuous cooling operation; In addition, two return liquid tanks 75 are respectively arranged on the cooling tank 101 below the inlet and outlet. When the cooling water in the cooling tank 101 flows out of the cooling tank 101 under the influence of certain factors, the cooling water can flow back to the second main pipe 701 along the fifth branch pipe 76 arranged at the bottom of the return liquid tank 75 with an opening at the top and finally flow back to the liquid storage mechanism 20 for subsequent recycling. Compared with the prior art, the design of connecting the return liquid tank 75 with the corresponding pipeline is convenient for collecting used cooling water, which is conducive to the recycling of cooling water, saves cooling water resources, and reduces production costs. The traction mechanism is the prior art, such as the belt drive traction method.

[0049] like Figures 7 to 9 As shown, the liquid storage mechanism 20 includes a liquid storage tank 21 and a filter assembly 50. The liquid storage tank 21 is arranged below the cooling tank 101 and is connected to the water outlet of the cooling tank 101 through the first pipeline 70. In the liquid storage tank 21, a slow flow chamber 211 and a filter chamber 212 are arranged in sequence along its height direction. The slow flow chamber 211 is connected to the filter chamber 212 through the connecting pipe 22. The liquid inlet arranged at the top of the slow flow chamber 211 is connected to the lower end of the first pipeline 70. The first liquid outlet arranged at the bottom of the filter chamber 212 is connected to the first end of the fourth pipeline 74. A second liquid outlet is arranged on the filter chamber 212 above the first liquid outlet. The second liquid outlet is connected to the refrigeration device 30 through the second pipeline 72. The filter assembly 50 is arranged in the filter chamber 212 below the connecting pipe 22. The filter assembly 50 is used to filter the high-temperature water that flows back from the first pipeline 70 to the liquid storage tank 21.

[0050] The high-temperature cooling water used in the cooling process of the pipe by the cooling tank 101 will flow from the cooling tank 101 to the liquid storage tank 21 through the first pipeline 70. Because the liquid storage tank 21 is arranged below the cooling tank 101, under the action of gravity, the cooling water flows smoothly into the slow-flow cavity 211 at the top of the liquid storage tank 21. The liquid inlet at the top of the slow-flow cavity 211 is connected to the lower end of the first pipeline 70. The high-temperature cooling water first enters the slow-flow cavity 211. At this time, the flow rate of the cooling water is initially slowed down due to the change in space, so as to avoid direct impact on the bottom of the liquid storage tank 21 and cause greater disturbance.

[0051] The high-temperature cooling water entering the slow-flow chamber 211 stays briefly in the slow-flow chamber 211, and its flow rate becomes more stable, and then flows to the filter chamber 212 through the connecting pipe 22. The connecting pipe 22 plays a role of guiding the slow-flow cooling water into the filter chamber 212, ensuring that the cooling water enters the next processing link in a relatively stable state.

[0052] When the cooling water enters the filter chamber 212, the filter assembly 50 located in the filter chamber 212 below the connecting pipe 22 begins to function. The filter assembly 50 filters the high-temperature water that flows back from the first pipeline 70 to the liquid storage tank 21, and removes impurities that may be mixed into the cooling water during the cooling process, such as sediments in the cooling tank 101. The filtered coolant becomes pure and meets the requirements for recycling again. The high-temperature water filtered by the filter plate 51 is pumped into the refrigeration device 30 under the action of the second pipeline 72, and the refrigeration device 30 cools the high-temperature water. The second pipeline 72 is also provided with a pump, and the cooling water cooled by the refrigeration device 30 flows back to the liquid storage tank 21 through the third pipeline 73. In this process, the water of different temperatures gathered at the bottom of the water storage tank is fully mixed, and then the purified and cooled cooling water is pumped and transported to the nozzle 104 in the cooling tank 101 through the pump on the fourth pipeline 74, sprayed into the cooling tank 101 and cooled the pipe, so as to realize the recycling of cooling water.

[0053] By setting up a filter assembly 50 to filter the reflux cooling water, impurities can be effectively removed, reducing the deposition and adhesion of impurities in equipment components such as the cooling tank 101, the nozzle 104, and the pumping mechanism 40, reducing the risk of wear and blockage of these components due to impurities, thereby extending the service life of the entire cooling equipment and reducing equipment maintenance costs and downtime maintenance time. At the same time, the design of the slow flow chamber 211 allows the flow rate of the coolant to be stable during reflux, reducing the impact of the flow rate impact on the internal structure of the liquid storage tank 21 and subsequent filtering, pumping and other links, ensuring the stable and orderly operation of the entire cooling cycle system, and providing reliable support for continuous production.

[0054] like Figures 8 to 9As shown, the filter assembly 50 includes a filter plate 51, a brush plate 52 and a discharge chamber 54. The filter plate 51 is arranged in the filter chamber 212, and the upper surface of the filter plate 51 is inclined downward from the middle to both ends along the length direction thereof; the brush plate 52 is located above the filter plate 51, and the bristles 53 arranged at the lower end of the brush plate 52 are adapted to the upper surface of the filter plate 51. The upper end of the brush plate 52 moves back and forth along the length direction of the filter plate 51 under the drive of the reciprocating assembly 60; two discharge chambers 54 are arranged on both sides of the liquid storage tank 21 below the filter plate 51, respectively, and each discharge chamber 54 is connected to the filter chamber 212 through a first opening arranged at the top and a second opening arranged at the bottom thereof, and a third opening is arranged on one side of the liquid storage tank 21 corresponding to the discharge chamber 54, and a sundry box 55 is slidably arranged in each third opening, and the sundry box 55 is connected to the filter chamber 212 through a water filter hole arranged at the bottom thereof. A flow divider 56 is also provided in the filter chamber 212 between the connecting tube 22 and the reciprocating assembly 60 .

[0055] After the high-temperature water containing impurities enters the filter chamber 212, it will fall on the filter plate 51. Since the upper surface of the filter plate 51 is tilted downward from the middle to both ends along its length direction, the high-temperature water will flow to both sides along the tilted surface of the filter plate 51. In this process, the high-temperature water is filtered by the filter plate 51, and the impurities are left on the filter plate 51, and the filtered high-temperature water passes through the filter plate 51 and enters the space below it. The reciprocating assembly 60 drives the upper end of the brush plate 52 to move, so that the bristles 53 at the lower end of the brush plate 52 reciprocate along the length direction of the filter plate 51. During the movement, the bristles 53 will sweep the impurities remaining on the upper surface of the filter plate 51 to both sides. The impurities swept to both sides of the filter plate 51 will enter the discharge chamber 54 through the first opening at the top of the corresponding discharge chamber 54 under the action of the bristles 53, and then fall into the corresponding storage box 55. The water filter holes set at the bottom of the storage box 55 can allow some residual liquid that enters with impurities to flow back to the filter chamber 212, further realizing the collection of impurities and the separation of liquid. Compared with the prior art, the reciprocating assembly 60 drives the brush plate 52 to reciprocate, and can automatically clean the impurities remaining on the filter plate 51. There is no need to manually clean the filter plate 51 frequently, which reduces the cost of manual operation. At the same time, it also ensures the continuous and effective filtering performance of the filter plate 51, and avoids the influence of excessive accumulation of impurities on the filtering efficiency. At the same time, the set discharge chamber 54 and the storage box 55 cooperate, so that the impurities swept down can have a special collection area, and the storage box 55 adopts a sliding setting, which is convenient for regular removal and cleaning of the impurities collected therein. The operation is simple and convenient, which improves the practicality and convenience of the entire filter assembly 50 as a whole.

[0056] In a specific embodiment, Figures 9 and 10As shown, the reciprocating assembly 60 includes a reciprocating screw 61, a connecting plate 63, a sleeve 64, a guide rod 67 and a spring 66. The reciprocating screw 61 is arranged horizontally and is rotatably arranged in the filter chamber 212 under the drive of the first motor 62; the connecting plate 63 is arranged horizontally, the middle part of which is threadedly connected to and penetrates the reciprocating screw 61, and the two ends of the connecting plate 63 are respectively abutted against the two sides of the inner wall of the filter chamber 212, the lower end of the connecting plate 63 is provided with a sleeve 64, the upper end of the brush plate 52 is provided with a lifting rod 65, the upper end of the lifting rod 65 can slide deep into the sleeve 64, and the sleeve 64 is sleeved with a spring 66, and the two ends of the spring 66 are respectively against the connecting plate 63 and the brush plate 52; two guide rods 67 are vertically arranged on the brush plate 52 on both sides of the lifting rod 65, and each guide rod 67 is slidably connected to and penetrates the connecting plate 63.

[0057] When it is necessary to clean the impurities on the filter plate 51, the first motor 62 is started to drive the reciprocating screw 61 to rotate. Since the middle part of the connecting plate 63 is threadedly connected to the reciprocating screw 61, according to the principle of thread transmission, the rotating reciprocating screw 61 causes the connecting plate 63 to perform reciprocating linear motion along the axial direction of the reciprocating screw 61; when the connecting plate 63 moves, the sleeve 64 at its lower end also moves accordingly. Since the lifting rod 65 at the upper end of the brush plate 52 can be slidably extended into the sleeve 64, when the sleeve 64 moves, the brush plate 52 and the brush below it will be driven to move through the lifting rod 65. In this way, the reciprocating movement of the brush plate 52 along the length direction of the filter plate 51 is realized. During the movement of the brush plate 52, the spring 66 plays a role of buffering and pressure regulation. When the brush plate 52 encounters an obstacle or uneven surface on the filter plate 51, the spring 66 will automatically compress or extend according to the pressure, so that the brush plate 52 can adapt to the surface of the filter plate 51, always keep the bristles 53 in good contact with the upper surface of the filter plate 51, and ensure the impurity cleaning effect. In order to ensure that the connecting plate 63 can reciprocate smoothly, an optical axis parallel to the reciprocating screw 61 is provided in the filter cavity 212, and the optical axis is slidably connected and penetrates the connecting plate 63.

[0058] Compared with the prior art, the setting of the spring 66 enables the brush plate 52 to automatically adjust the position and pressure according to the surface conditions of the filter plate 51, ensuring that the bristles 53 always maintain a suitable contact force with the filter plate 51. This can not only effectively clean the impurities on the filter plate 51, but also avoid the problem of damaging the filter plate 51 due to excessive pressure or incomplete cleaning due to too little pressure, thereby improving the stability and reliability of the entire filtration system. The structure of the reciprocating assembly 60 is relatively simple, mainly consisting of basic components such as a reciprocating screw 61, a connecting plate 63, a sleeve 64, a guide rod 67 and a spring 66. The structures and principles of these components are relatively simple, and they are convenient in installation, commissioning and maintenance, thereby reducing the maintenance cost and failure rate of the equipment.

[0059] like Fig.11 As shown, the fourth pipeline 74 includes a first main pipe 741, a plurality of first branch pipes 742 and a second branch pipe 743. The first main pipe 741 is horizontally arranged at one side of the cooling tank 101, and the axial direction of the first main pipe 741 is parallel to the length direction of the cooling tank 101; the plurality of first branch pipes 742 correspond to the plurality of nozzles 104 one by one, one end of each first branch pipe 742 is connected to the first side of the first main pipe 741, and the other end of each first branch pipe 742 is connected to the corresponding nozzle 104; the second branch pipe 743 is arranged at the second side of the first main pipe 741, and the first end of the second branch pipe 743 is connected to the first main pipe 741, and the second end of the second branch pipe 743 is connected to the pumping mechanism 40.

[0060] When spraying water, the water flow from the pumping mechanism 40 first flows into the second branch pipe 743. The second branch pipe 743 serves as the input channel of the cooling water, and stably guides the cooling water into the first main pipe 741 connected thereto. Since the first main pipe 741 is horizontally arranged on one side of the cooling tank 101, and its axial direction is parallel to the length direction of the cooling tank 101, after the water flow enters the first main pipe 741, it will flow smoothly along the axial direction of the main pipe. With the larger pipe diameter of the main pipe, the water flow can be evenly distributed. Then, each first branch pipe 742 plays a diversion role, and according to the one-to-one corresponding connection relationship with multiple nozzles 104, the water flow in the first main pipe 741 is accurately distributed to the corresponding nozzle 104, and finally the nozzle 104 sprays the water cooling water into the cooling tank 101. For the first main pipe 741, considering that the first main pipe 741 needs to carry a large flow of water and its working environment, it is advisable to select a material with high strength, corrosion resistance and certain thermal conductivity. For example, stainless steel.

[0061] like Figure 7 As shown, the first pipeline 70 includes a second main pipe 701, a plurality of third branch pipes 702 and a fourth branch pipe 704. The second main pipe 701 is horizontally arranged below the cooling tank 101, and the axial direction of the second main pipe 701 is parallel to the length direction of the cooling tank 101; the plurality of third branch pipes 702 are respectively vertically arranged above the second main pipe 701, the upper end of each third branch pipe 702 is connected to the liquid leakage port arranged at the bottom of the cooling tank 101, and the lower end of each third branch pipe 702 is connected to the second main pipe 701; the fourth branch pipe 704 is vertically arranged below the second main pipe 701, the upper end of the fourth branch pipe 704 is connected to the second main pipe 701, and the lower end of the fourth branch pipe 704 is connected to the upper end of the liquid storage tank 21.

[0062] During the operation of the entire cooling device, the high-temperature cooling water first flows into the corresponding multiple third branch pipes 702 through the leakage port set at the bottom of the cooling tank 101. Since the third branch pipe 702 is vertically arranged above the second main pipe 701, under the action of gravity, the high-temperature cooling water will flow downward along the third branch pipe 702 and converge into the second main pipe 701 horizontally arranged below the cooling tank 101. At this time, the second main pipe 701, by virtue of its axis setting parallel to the length direction of the cooling tank 101, can make the incoming waste liquid evenly distributed along the axis of the main pipe, avoiding the accumulation of high-temperature waste water in a local area. Then, the waste liquid gathered in the second main pipe 701 passes through the fourth branch pipe 704 vertically arranged below it, and continues to flow downward, and finally flows into the upper end of the liquid storage tank 21, completing the collection and transfer of high-temperature cooling water.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A refrigerant injection and discharge mechanism, characterized in that: include: An air storage tank (10) having an air inlet pipe (11) at its upper end and an exhaust pipe (12) at its lower end, wherein an opening and closing unit (50) is provided in the exhaust pipe (12); A compressor (20) is arranged on one side of the gas storage tank (10), and its air intake port is connected to the exhaust pipe (12) through a first pipe (21); A pressure sensor (30) is installed on the first pipeline (21) and is used to monitor in real time the pressure of the refrigerant about to enter the compressor (20); The pressure regulating assembly (40) is arranged in the gas storage tank (10); when the pressure sensor (30) detects that the pressure in the first pipe (21) is lower than a set pressure, the opening and closing unit (50) opens to allow the refrigerant in the gas storage tank (10) to flow into the first pipe (21); when the pressure sensor (30) detects that the pressure in the first pipe (21) is higher than the set pressure, the opening and closing unit (50) opens a reverse channel to pump excess refrigerant back into the gas storage tank (10) until the pressure in the first pipe (21) returns to the set pressure.

2. The refrigerant injection and discharge mechanism according to claim 1, characterized in that: The opening and closing unit (50) comprises: A Tesla valve (51) is arranged horizontally, with its air inlet end being connected to the exhaust pipe (12) and its air outlet end being connected to the first pipeline (21) before the pressure sensor (30); A regulating valve (52) has one end connected to the air inlet end of the Tesla valve (51), and the other end connected to the Tesla valve (51) and a first pipeline (21) between the pressure sensor (30). The regulating valve (52) and the Tesla valve (51) form a parallel structure.

3. The refrigerant injection and discharge mechanism according to claim 2, characterized in that: The regulating valve (52) is a visually adjustable pressure difference bypass valve.

4. The refrigerant injection and discharge mechanism according to claim 1, characterized in that: The pressure regulating assembly (40) comprises: A screw rod (41) is vertically arranged in the gas storage tank (10), the upper end of which is threadedly connected to and penetrates the top end of the gas storage tank, and is then connected to a driving member (45), and the screw rod (41) rotates under the action of the driving member (45); A slider (42) is disposed in the gas storage tank (10) below the screw rod (41), the upper end of the slider (42) being rotatably connected to the lower end of the screw rod (41), and the side surface of the slider (42) being slidably connected to the inner wall of the gas storage tank (10); An air bag (43) is arranged below the slider (42); Two elastic baffles (44) are arranged in parallel below the airbag (43); the edge of each elastic baffle (44) is provided with a hard retaining ring (46) that slidably cooperates with the inner wall of the air storage tank (10); a non-Newtonian fluid spacer (47) is arranged between the two elastic baffles (44); and a shear-hardened non-Newtonian fluid is arranged in the non-Newtonian fluid spacer (47).

5. The refrigerant injection and discharge mechanism according to claim 2, characterized in that: The Tesla valve is also provided with a temperature sensor (53).

6. The refrigerant injection and discharge mechanism according to claim 1, characterized in that: The injection and discharge mechanism further comprises a controller, wherein the controller (60) is electrically connected to the pressure sensor (30), the temperature sensor (53), the pressure regulating component (40) and the opening and closing unit (50).

7. A refrigeration device, characterized in that: It comprises a condenser, a throttling device, an evaporator and the refrigerant injection and discharge mechanism according to any one of claims 1 to 6, wherein the refrigerant injection and discharge mechanism is connected to a first pipeline between the evaporator and the compressor (20) and is used for pumping refrigerant into the compressor (20).

8. A pipe production line, characterized in that: It includes an extruder, a shaping device, a cooling device, a traction device and the refrigeration device as described in claim 7, wherein the extruder is used to extrude the raw materials into a tubular structure, the shaping device shapes the extruded tube, the cooling device cools the tube, the traction device pulls the tube through the shaping device and the cooling device in sequence, and the refrigeration device provides cooling water for the cooling device.

9. A pipe production line according to claim 8, characterized in that: The cooling device comprises: A cooling trough mechanism is used to cool the pipe as it passes through; A liquid storage mechanism connected to the water outlet of the cooling tank mechanism through a pipeline; A refrigeration device, wherein the liquid inlet end is connected to the liquid storage mechanism via a pipeline, and the liquid outlet end is connected to the liquid storage mechanism via a third pipeline; The pumping mechanism is arranged on the fourth pipeline between the liquid storage mechanism and the cooling tank mechanism, and is used for pumping cold water into the cooling tank mechanism.

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