A low temperature freezer

Abstract

The present invention relates to the technical field of refrigeration equipment, and in particular to a low-temperature refrigerator, comprising a conveying unit, a storage unit, an expansion valve and a heat exchange unit. The conveying unit is used to pressurize gaseous refrigerant and convey it into the storage unit. The storage unit is used to store the refrigerant. As the refrigerant continues to increase, its pressure increases and is converted into a liquid state. The storage unit is provided with a cooling structure for cooling the refrigerant in the storage unit. Through the vortex design of the first vortex plate and the second vortex plate and the relative movement therebetween, bidirectional continuous suction, pressurization and conveying of the refrigerant are realized. This unique bidirectional reciprocating motion not only improves the conveying efficiency of the refrigerant, but also can realize bidirectional continuous conveying without relying on external auxiliary devices, simplifying the structure and reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, in particular to a low-temperature refrigerator. Background Art

[0002] A cryogenic freezer is a device specially designed to generate and maintain a low-temperature environment to meet the needs of low-temperature conditions in different industrial, scientific research, and medical fields. The core working principle of a cryogenic freezer is based on the refrigeration cycle. Common refrigeration cycles include vapor compression cycle, absorption cycle, etc. In the vapor compression cycle, the refrigerant goes through four stages of compression, condensation, expansion, and evaporation, and circulates back and forth to remove heat from the system and achieve a cooling effect.

[0003] In recent years, with the progress of materials science, precision processing technology and control theory, higher requirements have been put forward for the design of cryogenic freezers, especially in terms of miniaturization, energy saving and consumption reduction, noise reduction, and improved work efficiency. The market urgently needs an innovative cryogenic freezer preparation technology to break through the performance bottleneck of traditional freezer systems and meet the growing demands for high efficiency, environmental protection, and low noise. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a low-temperature refrigerator, and the specific technical solution adopted is:

[0005] A low-temperature refrigerator comprises a delivery unit, a storage unit, an expansion valve and a heat exchange unit. The delivery unit is used to pressurize gaseous refrigerant and deliver it to the storage unit. The storage unit is used to store the refrigerant. As the refrigerant continues to increase, its pressure increases and is converted into a liquid state. The storage unit is provided with a cooling structure for cooling the refrigerant in the storage unit. The liquid refrigerant in the storage unit is depressurized through the expansion valve and delivered to the heat exchange unit. The refrigerant in the heat exchange unit absorbs heat and refrigerates the medium in the heat exchange unit. The low-temperature medium is used to provide a low-temperature environment for external equipment.

[0006] The conveying unit comprises an outer cylinder and a first scroll plate and a second scroll plate located inside the outer cylinder, the first scroll plate and the second scroll plate are both scroll-shaped, and the first scroll plate and the second scroll plate are mutually sleeved, a support plate is coaxially rotated at the top of the outer cylinder, an eccentric disk is eccentrically rotated on the support disk, the top of the first scroll plate is arranged on the eccentric disk, and the bottom of the second scroll plate is arranged at the bottom of the outer cylinder;

[0007] Among them, the eccentric disk and the first scroll plate perform translational circular motion around the axis of the supporting disk. When a cavity is formed between the first scroll plate and the second scroll plate, the cavity is used to store refrigerant. When the first scroll plate moves and squeezes the cavity, the refrigerant flows to the middle of the first scroll plate.

[0008] Furthermore, the outer cylinder is provided with a power unit for providing power for the movement of the eccentric disk, and the power unit includes a support frame fixed on the outer cylinder, the support frame is provided with two first transmission wheels, a second transmission wheel located between the two first transmission wheels, a first motor providing power for the second transmission wheels, and a shifting column eccentrically installed on each first transmission wheel, the first transmission wheel is transmission-connected with the second transmission wheel, and the shifting column is rotationally connected with the eccentric disk.

[0009] Furthermore, a partition plate sliding along the axis of the outer cylinder is provided in the outer cylinder, the bottom of the first scroll plate is in sliding contact with the partition plate, and the second scroll plate slides through the partition plate;

[0010] The eccentric disk is hollow inside, the top of the first scroll plate is slidably inserted into the eccentric disk, and the eccentric disk and the first scroll plate are connected via a mounting plate and a spring, and the spring provides a downward elastic thrust for the first scroll plate.

[0011] Furthermore, the first scroll plate and the second scroll plate are both hollow inside, and the inside of the first scroll plate and the inside of the second scroll plate are both used to store cooling water.

[0012] Furthermore, a water supply tee and a drainage tee are provided on the outer cylinder, one input end of the water supply tee is connected to one end of the first vortex plate, the other input end of the water supply tee is connected to one end of the second vortex plate, one output end of the drainage tee is connected to the other end of the first vortex plate, the other output end of the drainage tee is connected to the other end of the second vortex plate, the water supply tee is used to supply cooling water to the first vortex plate and the second vortex plate, and the drainage tee is used to discharge the cooling water in the first vortex plate and the second vortex plate;

[0013] Among them, the two input ends of the water supply three-way pipe are both located at the axis position of the outer cylinder.

[0014] Furthermore, the outer cylinder is provided with two sets of threaded cylinders and threaded rods for use together. The threaded cylinder is rotatably installed at the bottom of the outer cylinder, and the threaded rod passes through the threaded cylinder and is fixed at the bottom of the partition. A worm gear is installed on each threaded cylinder, and a worm is meshed on the two worm gears. The worm is powered by a second motor.

[0015] Further, the storage unit includes a storage barrel, a first pipe and a second pipe connected and installed at the bottom of the storage barrel, the input end of the first pipe passes through the outer barrel and the partition and is connected to the inside of the outer barrel, the refrigerant squeezed in the outer barrel is transported into the storage barrel through the first pipe, a one-way valve is arranged on the first pipe, the output end of the second pipe is connected to the heat exchange unit, the expansion valve is installed on the second pipe, and the second pipe is provided with a first pressure regulating valve;

[0016] The cooling structure is a spiral heat exchange tube wound around the storage barrel, in which cooling water is transported and has a cooling effect on the storage barrel.

[0017] Furthermore, a piston is provided in the middle of the storage barrel for sliding along the axis direction of the storage barrel, and a constant pressure structure for providing constant pressure to the piston is provided on the piston, and the constant pressure structure is used to provide constant pressure to the refrigerant in the storage barrel through the piston.

[0018] Furthermore, the piston divides the internal space of the storage barrel into a lower space and an upper space, the lower space is used to store refrigerant, and the upper space is used to store cooling water. Two auxiliary pipes are connected to the upper space, one auxiliary pipe is connected to the spiral heat exchange tube, and a second pressure regulating valve is provided on the auxiliary pipe, and the other auxiliary pipe is used to supply cooling water to the upper space.

[0019] Furthermore, the heat exchange unit includes a heat exchange cylinder and a spiral plate installed in the heat exchange cylinder, the spiral plate is hollow inside, the output end of the second pipeline is connected to one end of the spiral plate, and the other end of the spiral plate is provided with a third pipeline, and the third pipeline is connected to the outer cylinder;

[0020] The upper and lower sides of the heat exchange cylinder are both connected with fourth pipes, one fourth pipe is used to supply the medium into the heat exchange cylinder, and the other fourth pipe is used to discharge the medium in the heat exchange cylinder.

[0021] The advantages of the present invention are:

[0022] The vortex design of the first vortex plate and the second vortex plate and the relative movement between them realizes the bidirectional continuous suction, pressurization and delivery of the refrigerant. This unique bidirectional reciprocating motion not only improves the delivery efficiency of the refrigerant, but also realizes bidirectional continuous delivery without relying on external auxiliary devices, simplifies the structure and reduces the cost.

[0023] Since the movement of the first scroll plate and the second scroll plate can process the refrigerant smoothly with little vibration, the energy loss caused by mechanical vibration and energy consumption is reduced, which is beneficial to the energy efficiency improvement of the overall system and meets the design requirements of energy saving and consumption reduction;

[0024] The design and continuous formation of the closed refrigerant delivery space ensures the continuity and stability of the delivery process, avoids the problem of refrigerant leakage or backflow, and enhances the reliability and working efficiency of the system;

[0025] In summary, this low-temperature freezer technology solution effectively addresses the challenges faced by traditional low-temperature freezers in miniaturization, energy saving, noise reduction, and efficiency improvement through innovative refrigerant processing and delivery mechanisms, providing more advanced and efficient low-temperature environment solutions for industry, scientific research, and medical fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure of the middle conveying unit;

[0029] Figure 3 yes Figure 2 Schematic diagram of the structure viewed from above;

[0030] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure of the middle and outer cylinders;

[0031] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of the middle eccentric disc;

[0032] Figure 6 yes Figure 5 A schematic cross-sectional view of the first scroll plate and the second scroll plate;

[0033] Figure 7 yes Figure 1 A schematic diagram of the cross-sectional enlarged structure of the storage unit;

[0034] Figure 8 yes Figure 1 A schematic diagram of the cross-sectional enlarged structure of the middle heat exchange unit;

[0035] Markings in the accompanying drawings:

[0036] 100, conveying unit; 101, outer cylinder; 102, support plate; 103, eccentric plate; 104, first vortex plate; 105, second vortex plate; 106, support frame; 107, first transmission wheel; 108, second transmission wheel; 109, first motor; 110, dial column; 111, partition; 112, mounting plate; 113, spring; 114, water supply tee; 115, drainage tee; 116, threaded cylinder; 117, threaded rod; 118, second motor; 119, worm; 120, worm wheel;

[0037] 200, storage unit; 201, storage barrel; 202, first pipeline; 203, second pipeline; 204, one-way valve; 205, first pressure regulating valve; 206, spiral heat exchange tube; 207, piston; 208, auxiliary pipe; 209, second pressure regulating valve;

[0038] 300, expansion valve;

[0039] 400, heat exchange unit; 401, heat exchange tube; 402, spiral plate; 403, third pipeline; 404, fourth pipeline. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. This embodiment is written in a progressive manner.

[0043] like Figures 1 to 6 As shown, a low-temperature refrigerator of the present invention includes a conveying unit 100, a storage unit 200, an expansion valve 300 and a heat exchange unit 400. The conveying unit 100 is used to pressurize the gaseous refrigerant and convey it into the storage unit 200. The storage unit 200 is used to store the refrigerant. As the refrigerant continues to increase, its pressure increases and is converted into a liquid state. The storage unit 200 is provided with a cooling structure for cooling the refrigerant in the storage unit 200. The liquid refrigerant in the storage unit 200 is depressurized through the expansion valve 300 and conveyed into the heat exchange unit 400. The refrigerant in the heat exchange unit 400 absorbs heat and refrigerates the medium in the heat exchange unit 400. The low-temperature medium is used to provide a low-temperature environment for external equipment.

[0044] The conveying unit 100 includes an outer cylinder 101 and a first scroll plate 104 and a second scroll plate 105 located inside the outer cylinder 101. The first scroll plate 104 and the second scroll plate 105 are both scroll-shaped, and the first scroll plate 104 and the second scroll plate 105 are mutually sleeved. A support plate 102 is coaxially rotated at the top of the outer cylinder 101, and an eccentric disk 103 is eccentrically rotated on the support disk 102. The top of the first scroll plate 104 is arranged on the eccentric disk 103, and the bottom of the second scroll plate 105 is arranged at the bottom of the outer cylinder 101.

[0045] Among them, the eccentric disk 103 and the first vortex plate 104 perform translational circular motion around the axis of the support disk 102. When a cavity is formed between the first vortex plate 104 and the second vortex plate 105, the cavity is used to store refrigerant. When the first vortex plate 104 moves and squeezes the cavity, the refrigerant flows to the middle of the first vortex plate 104.

[0046] In detail, the circulation process of the refrigerant in the equipment is as follows: the refrigerant is pressurized in the conveying unit 100 and continuously sent to the storage unit 200. The amount of refrigerant in the storage unit 200 increases and its pressure increases. The refrigerant is compressed from a gaseous state to a liquid state. The cooling structure on the storage unit 200 cools the liquid, high-temperature, and high-pressure refrigerant, thereby making the refrigerant in a low-temperature and high-pressure state. The refrigerant in the low-temperature and high-pressure state is released by the expansion valve 300, the refrigerant pressure drops and absorbs heat. The refrigerant in this state is discharged into the heat exchange unit 400 and absorbs heat for the medium in the heat exchange unit 400, thereby reducing the temperature of the medium. The refrigerant transfers the low temperature to the medium, and transfers the low temperature to the external equipment through the flow of the medium, thereby supplying the low temperature.

[0047] The position of the second vortex plate 105 is fixed, and the first vortex plate 104 performs eccentric rotational motion, and the direction of the first vortex plate 104 remains unchanged, that is, the first vortex plate 104 performs translational rotational motion. This motion mode rotates the supporting disk 102 and drives the eccentric disk 103 to perform circular motion, and then cooperates with the reverse rotation of the eccentric disk 103 on the supporting disk 102, so that the direction of the eccentric disk 103 in space remains unchanged, and the eccentric disk 103 synchronously drives the first vortex plate 104 to move.

[0048] The specific working method of the first vortex plate 104 and the second vortex plate 105 in the conveying unit 100 for squeezing the refrigerant is that the first vortex plate 104 performs eccentric circular motion, that is, the first vortex plate 104 and the second vortex plate 105 move relative to each other. At the outer end position of the second vortex plate 105, the distance between the outer wall of the first vortex plate 104 and the outer end of the second vortex plate 105 increases. At this time, a cavity is formed at this position, and the refrigerant enters the cavity. As the first vortex plate 104 moves, the outer wall of the first vortex plate 104 gradually approaches the outer end of the second vortex plate 105, and moves away from the outer end of the second vortex plate 105 along the vortex direction of the second vortex plate 105. The space between the second vortex plate 105 and the first vortex plate 104 increases, so that the refrigerant rotates toward the second vortex plate 105 along the vortex direction of the second vortex plate 105. The refrigerant flows in the middle, and when the outer wall of the first vortex plate 104 contacts the outer end of the second vortex plate 105, the space between the first vortex plate 104 and the second vortex plate 105 is sealed. At this time, the refrigerant in the space is isolated from the refrigerant inside the outer cylinder 101. As the first vortex plate 104 continues to move, the refrigerant is continuously transported into the middle position of the second vortex plate 105, thereby realizing the pressurized transportation of the refrigerant. Since the first vortex plate 104 and the second vortex plate 105 are in a relative motion state, the pressurized transportation of the refrigerant can be realized from the outer end side of the first vortex plate 104 and from the outer end side of the second vortex plate 105, so as to achieve the purpose of two-way transportation and improve the refrigerant transportation efficiency. The refrigerant moved to the middle of the second vortex plate 105 will be discharged into the storage unit 200 through the pipeline.

[0049] Since the first scroll plate 104 and the second scroll plate 105 can form a closed space when conveying the refrigerant under pressure, the refrigerant can be conveyed with the refrigerant. This can save the cost of installing a one-way valve and other structures, and the conveying state is stable with little vibration.

[0050] In actual use, the top of the first scroll plate 104 is connected to the eccentric disk 103, the bottom of the first scroll plate 104 is in sliding contact with the bottom of the outer cylinder 101, the top of the second scroll plate 105 is in sliding contact with the eccentric disk 103, and the bottom of the second scroll plate 105 is fixedly connected to the bottom of the outer cylinder 101, thereby sealing the refrigerant transported between the first scroll plate 104 and the second scroll plate 105 to prevent the refrigerant from flowing back into the outer cylinder 101 from the upper and lower sides of the first scroll plate 104 or the second scroll plate 105 and causing abnormal transportation.

[0051] Through the vortex design of the first vortex plate 104 and the second vortex plate 105 and the relative movement therebetween, two-way continuous suction, pressurization and transportation of the refrigerant are achieved. This unique two-way reciprocating motion not only improves the transportation efficiency of the refrigerant, but also can achieve two-way continuous transportation without relying on external auxiliary devices, simplifying the structure and reducing costs; since the movement mode of the first vortex plate 104 and the second vortex plate 105 can process the refrigerant smoothly and with little vibration, the energy loss caused by mechanical vibration and energy consumption is reduced, which is beneficial to improving the energy efficiency of the overall system and meets the design requirements of energy saving and consumption reduction; the design and continuous formation of the closed transportation space for the refrigerant ensures the continuity and stability of the transportation process, avoids the problem of refrigerant leakage or reflux, and enhances the reliability and work efficiency of the system; in summary, the technical solution of the low-temperature refrigerator effectively responds to the challenges faced by traditional low-temperature refrigerators in miniaturization, energy saving, noise reduction, and efficiency improvement through innovative refrigerant processing and transportation mechanisms, and provides more advanced and efficient low-temperature environment solutions for industry, scientific research and medical fields.

[0052] like Figure 2 As shown, the outer cylinder 101 is provided with a power unit for providing power for the movement of the eccentric disk 103, and the power unit includes a support frame 106 fixed on the outer cylinder 101, and the support frame 106 is provided with two first transmission wheels 107, a second transmission wheel 108 located between the two first transmission wheels 107, a first motor 109 providing power for the second transmission wheel 108, and a shifting post 110 eccentrically installed on each first transmission wheel 107, the first transmission wheel 107 is transmission-connected with the second transmission wheel 108, and the shifting post 110 is rotationally connected with the eccentric disk 103.

[0053] In detail, one end of the lever 110 is fixed on the first transmission wheel 107, and the other end thereof is rotatably mounted on the eccentric disk 103. Due to the structural mode of adopting two levers 110, the two levers 110 can provide rotational power to the eccentric disk 103 at the same time, and the two levers 110 limit the movement of the eccentric disk 103, so that the eccentric disk 103 cannot rotate on its own and can only perform circular motion around the axis of the support disk 102.

[0054] The second transmission wheel 108 is coaxial with the support disk 102. When the first motor 109 drives the second transmission wheel 108 to rotate, the second transmission wheel 108 can drive the two first transmission wheels 107 to rotate synchronously in the same direction. At this time, the two shifting posts 110 shift the eccentric disk 103 to perform a circular motion around the axis of the second transmission wheel 108, that is, the eccentric disk 103 performs a circular motion around the axis of the support disk 102, and the eccentric disk 103 drives the support disk 102 to rotate on the outer cylinder 101. At the same time, due to the restriction of the two shifting posts 110, the eccentric disk 103 cannot rotate by itself, thereby realizing the translational rotational motion of the eccentric disk 103 and the first scroll plate 104 thereon.

[0055] like Figures 4 to 5 As shown, a partition plate 111 is provided inside the outer cylinder 101 and slides along the axis of the outer cylinder 101 , the bottom of the first scroll plate 104 is in sliding contact with the partition plate 111 , and the second scroll plate 105 slides through the partition plate 111 ;

[0056] The eccentric disk 103 is hollow inside, the top of the first scroll plate 104 is slidably inserted into the eccentric disk 103, and the eccentric disk 103 and the first scroll plate 104 are connected via a mounting plate 112 and a spring 113, and the spring 113 provides a downward elastic thrust for the first scroll plate 104.

[0057] In detail, the partition 111 divides the internal space of the outer cylinder 101 into an extrusion space on the upper side and an adjustable space on the lower side. The top of the first scroll plate 104 is slidably inserted into the eccentric disk 103 and connected to each other through the mounting plate 112 and the spring 113. The bottom of the first scroll plate 104 is in sliding contact with the partition 111, and the bottom of the second scroll plate 105 is fixed on the outer cylinder 101, and the second scroll plate 105 slides through the partition 111 along the axial direction of the outer cylinder 101. In this way, when the partition 111 moves up and down, the size of the extrusion space changes. At this time, the partition 111 will push the first scroll plate 104 to slide on the eccentric disk 103, the spring 113 will undergo elastic deformation, and the second scroll plate 105 will slide relative to the partition 111. Due to the change in the size of the extrusion space, the size of the working area of ​​the first scroll plate 104 and the second scroll plate 105 changes, that is, the refrigerant delivery speed is adjusted.

[0058] like Figure 6 As shown, the first scroll plate 104 and the second scroll plate 105 are both hollow inside, and the inside of the first scroll plate 104 and the inside of the second scroll plate 105 are both used to store cooling water.

[0059] In detail, since the first vortex plate 104 and the second vortex plate 105 need to pressurize the refrigerant, the temperature of the refrigerant increases, and the refrigerant transfers the high temperature to the first vortex plate 104 and the second vortex plate 105. In order to prevent the first vortex plate 104 and the second vortex plate 105 from being deformed due to long-term heat exposure and to cool the refrigerant, the first vortex plate 104 and the second vortex plate 105 can be set to a hollow state, and then cooling water is filled into the first vortex plate 104 and the second vortex plate 105, thereby cooling the refrigerant.

[0060] This structure can facilitate the initial cooling of the compressed refrigerant, which not only protects the equipment structure but also reduces the refrigerant temperature, making it easier for subsequent pressure release, expansion and heat absorption.

[0061] like Figure 2As shown, a water supply tee 114 and a drainage tee 115 are provided on the outer cylinder 101, one input end of the water supply tee 114 is connected to one end of the first vortex plate 104, the other input end of the water supply tee 114 is connected to one end of the second vortex plate 105, one output end of the drainage tee 115 is connected to the other end of the first vortex plate 104, the other output end of the drainage tee 115 is connected to the other end of the second vortex plate 105, the water supply tee 114 is used to supply cooling water to the first vortex plate 104 and the second vortex plate 105, and the drainage tee 115 is used to discharge the cooling water in the first vortex plate 104 and the second vortex plate 105;

[0062] The two input ends of the water supply three-way pipe 114 are both located on the axis of the outer cylinder 101 .

[0063] In detail, external cooling water can be continuously supplied into the first scroll plate 104 and the second scroll plate 105 through the water supply tee 114, and the cooling water cools the first scroll plate 104, the second scroll plate 105 and the compressed refrigerant. The cooling water in the first scroll plate 104 and the second scroll plate 105 can be discharged through the drainage tee 115, thereby realizing water circulation.

[0064] By setting the input end position of the water supply tee 114, the flow direction of the water in the first vortex plate 104 and the second vortex plate 105 can be conveniently set, so that the water flow is opposite to the refrigerant flow direction, thereby improving the heat exchange effect.

[0065] like Figure 3 As shown, the outer cylinder 101 is provided with two sets of threaded cylinders 116 and threaded rods 117 for use together. The threaded cylinder 116 is rotatably installed at the bottom of the outer cylinder 101, and the threaded rod 117 passes through the threaded cylinder 116 and is fixed to the bottom of the partition 111. A worm gear 120 is installed on each threaded cylinder 116, and a worm 119 is meshed with two worm gears 120. The worm 119 is powered by a second motor 118.

[0066] In detail, the second motor 118 provides rotational power to the two worm wheels 120 through the worm 119. The worm wheel 120 drives the threaded cylinder 116 to rotate. The threaded cylinder 116 and the threaded rod 117 are meshed with each other. The rotating threaded cylinder 116 pushes the partition 111 up and down through the threaded rod 117, thereby adjusting the position of the partition 111 inside the outer cylinder 101, which is convenient for adjusting the refrigerant delivery amount.

[0067] like Figure 7As shown, the storage unit 200 includes a storage barrel 201, a first pipe 202 and a second pipe 203 which are connected and installed at the bottom of the storage barrel 201, the input end of the first pipe 202 passes through the outer barrel 101 and the partition 111 and is connected to the inside of the outer barrel 101, the refrigerant squeezed in the outer barrel 101 is transported into the storage barrel 201 through the first pipe 202, a one-way valve 204 is arranged on the first pipe 202, the output end of the second pipe 203 is connected to the heat exchange unit 400, the expansion valve 300 is installed on the second pipe 203, and the second pipe 203 is provided with a first pressure regulating valve 205;

[0068] The cooling structure is a spiral heat exchange tube 206 wound around the storage barrel 201 . The spiral heat exchange tube 206 transports cooling water and has a cooling effect on the storage barrel 201 .

[0069] In detail, the pressurized refrigerant in the outer cylinder 101 is transported into the storage barrel 201 for storage through the first pipe 202. The one-way valve 204 can maintain the one-way flow of the refrigerant in the first pipe 202. As the refrigerant in the storage barrel 201 increases, its pressure increases and reaches the refrigerant state transition pressure. At this time, the refrigerant changes from gas to liquid. The spiral heat exchange tube 206 can cool the high-temperature and high-pressure refrigerant and the storage barrel 201. The liquid refrigerant can be discharged into the heat exchange unit 400 through the second pipe 203, the first pressure regulating valve 205 and the expansion valve 300. The first pressure regulating valve 205 is used to adjust the pressure of the liquid refrigerant.

[0070] When the pressure in the storage barrel 201 reaches the refrigerant phase transition pressure, the pressure is the working pressure of the storage barrel 201 .

[0071] like Figure 7 As shown, a piston 207 is provided in the middle of the storage barrel 201 for sliding along the axis direction of the storage barrel 201 , and a constant pressure structure for providing a constant pressure to the piston 207 is provided on the piston 207 , and the constant pressure structure is used to provide a constant pressure for the refrigerant in the storage barrel 201 through the piston 207 .

[0072] In detail, the piston 207 can slide vertically in the storage barrel 201, and the space below the piston 207 is used to store the refrigerant. The constant pressure structure provides a constant pressure to the refrigerant through the piston 207, thereby causing the refrigerant to undergo a shape change.

[0073] Due to the continuous input and output of the refrigerant in the storage barrel 201 and the change in the form of the refrigerant in the storage barrel 201, the size of the space in the storage barrel 201 will change frequently, and this change will affect the normal working process of the refrigerant changing from gas to liquid. Therefore, in order to ensure that the pressure is constant and not affected by the change in the size of the space where the refrigerant is located, it is necessary to enable the piston 207 to move to adapt to the space changes, and the constant pressure structure can always provide constant pressure to the refrigerant through the piston 207, thereby ensuring normal and stable operation of the equipment.

[0074] like Figure 7 As shown, the piston 207 divides the internal space of the storage barrel 201 into a lower space and an upper space. The lower space is used to store refrigerant, and the upper space is used to store cooling water. Two auxiliary pipes 208 are connected to the upper space, one auxiliary pipe 208 is connected to the spiral heat exchange tube 206, and a second pressure regulating valve 209 is provided on the auxiliary pipe 208. The other auxiliary pipe 208 is used to supply cooling water to the upper space.

[0075] In detail, external cooling water can enter the upper space of the storage barrel 201 through a sub-pipe 208, and the water in the upper space can enter the spiral heat exchange tube 206 through another sub-pipe 208. The water in the spiral heat exchange tube 206 can cool the storage barrel 201, and the cooled water can flow back into the external water tank or radiator. The setting of the second pressure regulating valve 209 can keep the pressure in the upper space inside the storage barrel 201 constant, thereby providing a constant pressure for the piston 207.

[0076] This structure can use the pressure of the cooling water and the pressure regulating effect of the second pressure regulating valve 209 to provide a constant pressure for the piston 207 , while the cooling water can flow into the spiral heat exchange tube 206 and cool the storage barrel 201 .

[0077] In actual use, the pressures of the first pressure regulating valve 205 and the second pressure regulating valve 209 can be adjusted to be consistent.

[0078] like Figure 8 As shown, the heat exchange unit 400 includes a heat exchange cylinder 401 and a spiral plate 402 installed in the heat exchange cylinder 401. The spiral plate 402 is hollow inside. The output end of the second pipe 203 is connected to one end of the spiral plate 402. The other end of the spiral plate 402 is provided with a third pipe 403, and the third pipe 403 is connected to the outer cylinder 101.

[0079] Fourth pipes 404 are provided on both upper and lower sides of the heat exchange tube 401 . One fourth pipe 404 is used to supply the medium into the heat exchange tube 401 , and the other fourth pipe 404 is used to discharge the medium in the heat exchange tube 401 .

[0080] In detail, the refrigerant released from the expansion valve 300 is discharged into the spiral plate 402 and moves upward in a spiral along the trajectory of the spiral plate 402. The medium flows in a spiral from top to bottom along the trajectory of the spiral plate 402 in the heat exchange tube 401, thereby generating heat exchange between the refrigerant and the medium, and the temperature of the medium decreases. The refrigeration effect and heat exchange time of the medium can be improved through the spiral and relative flow. The fourth pipe 404 is used to transport the medium. The refrigerant in the spiral plate 402 flows back into the outer tube 101 through the third pipe 403 for recycling.

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A low temperature refrigerator, characterized in that: It includes a conveying unit, a storage unit, an expansion valve and a heat exchange unit. The conveying unit is used to pressurize the gaseous refrigerant and convey it into the storage unit. The storage unit is used to store the refrigerant. As the refrigerant continues to increase, its pressure increases and is converted into a liquid state. The storage unit is provided with a cooling structure for cooling the refrigerant in the storage unit. The liquid refrigerant in the storage unit is depressurized through the expansion valve and conveyed into the heat exchange unit. The refrigerant in the heat exchange unit absorbs heat and refrigerates the medium in the heat exchange unit. The low-temperature medium is used to provide a low-temperature environment for external equipment. The conveying unit comprises an outer cylinder and a first scroll plate and a second scroll plate located inside the outer cylinder, the first scroll plate and the second scroll plate are both scroll-shaped, and the first scroll plate and the second scroll plate are mutually sleeved, a support plate is coaxially rotated at the top of the outer cylinder, an eccentric disk is eccentrically rotated on the support disk, the top of the first scroll plate is arranged on the eccentric disk, and the bottom of the second scroll plate is arranged at the bottom of the outer cylinder; The eccentric disk and the first scroll plate perform translational circular motion around the axis of the support disk. When a cavity is formed between the first scroll plate and the second scroll plate, the cavity is used to store refrigerant. When the first scroll plate moves and squeezes the cavity, the refrigerant flows to the middle of the first scroll plate. The outer cylinder is provided with a power unit for providing power for the movement of the eccentric disk, the power unit comprises a support frame fixed on the outer cylinder, the support frame is provided with two first transmission wheels, a second transmission wheel located between the two first transmission wheels, a first motor for providing power for the second transmission wheels, and a shifting column eccentrically installed on each first transmission wheel, the first transmission wheel is transmission-connected with the second transmission wheel, and the shifting column is rotationally connected with the eccentric disk; The outer cylinder is provided with a partition plate sliding along the axis of the outer cylinder, the bottom of the first scroll plate is in sliding contact with the partition plate, and the second scroll plate slides through the partition plate; The eccentric disk is hollow inside, the top of the first scroll plate is slidably inserted into the eccentric disk, and the eccentric disk and the first scroll plate are connected via a mounting plate and a spring, and the spring provides a downward elastic thrust for the first scroll plate; The first scroll plate and the second scroll plate are both hollow inside, and the inside of the first scroll plate and the inside of the second scroll plate are both used to store cooling water.

2. A cryogenic refrigerator according to claim 1, characterized in that: The outer cylinder is provided with a water supply tee and a drainage tee, one input end of the water supply tee is connected to one end of the first vortex plate, the other input end of the water supply tee is connected to one end of the second vortex plate, one output end of the drainage tee is connected to the other end of the first vortex plate, the other output end of the drainage tee is connected to the other end of the second vortex plate, the water supply tee is used to supply cooling water to the first vortex plate and the second vortex plate, and the drainage tee is used to discharge the cooling water in the first vortex plate and the second vortex plate; Among them, the two input ends of the water supply three-way pipe are both located at the axis position of the outer cylinder.

3. A cryogenic refrigerator according to claim 2, characterized in that: The outer cylinder is provided with two sets of threaded cylinders and threaded rods for use together. The threaded cylinders are rotatably installed at the bottom of the outer cylinder. The threaded rods pass through the threaded cylinders and are fixed at the bottom of the partition. A worm wheel is installed on each threaded cylinder. A worm is meshed with two worm wheels. The worm is powered by a second motor.

4. A cryogenic refrigerator according to claim 1, characterized in that: The storage unit comprises a storage barrel, a first pipe and a second pipe connected and installed at the bottom of the storage barrel, the input end of the first pipe passes through the outer barrel and the partition and is connected to the inside of the outer barrel, the refrigerant squeezed in the outer barrel is transported into the storage barrel through the first pipe, a one-way valve is arranged on the first pipe, the output end of the second pipe is connected to the heat exchange unit, the expansion valve is installed on the second pipe, and the second pipe is provided with a first pressure regulating valve; The cooling structure is a spiral heat exchange tube wound around the storage barrel, in which cooling water is transported and has a cooling effect on the storage barrel.

5. A cryogenic refrigerator according to claim 4, characterized in that: A piston is provided in the middle of the storage barrel for sliding along the axis direction of the storage barrel. A constant pressure structure for providing constant pressure to the piston is provided on the piston, and the constant pressure structure is used to provide constant pressure for the refrigerant in the storage barrel through the piston.

6. A cryogenic refrigerator according to claim 5, characterized in that: The piston divides the internal space of the storage barrel into a lower space and an upper space. The lower space is used to store refrigerant, and the upper space is used to store cooling water. Two auxiliary pipes are connected to the upper space, one of which is connected to the spiral heat exchange tube and is provided with a second pressure regulating valve. The other auxiliary pipe is used to supply cooling water to the upper space.

7. A cryogenic refrigerator according to claim 4, characterized in that: The heat exchange unit comprises a heat exchange cylinder and a spiral plate installed in the heat exchange cylinder, the spiral plate is hollow inside, the output end of the second pipe is connected to one end of the spiral plate, the other end of the spiral plate is provided with a third pipe, and the third pipe is connected to the outer cylinder; The upper and lower sides of the heat exchange cylinder are both connected with fourth pipes, one fourth pipe is used to supply the medium into the heat exchange cylinder, and the other fourth pipe is used to discharge the medium in the heat exchange cylinder.

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