Ultra-low temperature refrigerator and laboratory operating table

Abstract

The present invention provides an ultra-low temperature refrigerator and a laboratory operating table. The ultra-low temperature refrigerator comprises a shell, a back plate arranged inside the shell, and a refrigeration assembly, wherein the back plate divides the internal chamber of the shell into a refrigeration chamber located in the front and an electrical chamber located in the rear, and the refrigeration assembly is arranged in the electrical chamber. In the present invention, the refrigeration system of the ultra-low temperature refrigerator is arranged at the back of the refrigerator, which greatly reduces the height of the ultra-low temperature refrigerator, so that the ultra-low temperature refrigerator can be placed under the laboratory operating table, so that the space under the operating table is effectively utilized, space is saved, the laboratory space layout is optimized, and laboratory management is convenient.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, in particular to an ultra-low temperature refrigerator and a laboratory operating table. Background Art

[0002] Low-temperature laboratories are generally equipped with ultra-low temperature refrigerators and operating tables. Ultra-low temperature refrigerators are large in size, and the refrigeration components of ultra-low temperature refrigerators in the prior art are generally arranged at the bottom of the refrigerator, resulting in a relatively high overall height of the refrigerator. Therefore, ultra-low temperature refrigerators and operating tables are usually placed separately, and the space under the operating table is usually arranged in the form of a cabinet. However, in this layout, the cabinet under the operating table is used to hold laboratory devices, and the staff needs to bend over to take and put, which is extremely inconvenient. For a long time, the area under the operating table is either vacant or used to store some infrequently used devices, and it is necessary to set up a storage cabinet to store commonly used devices. As a result, there are defects such as low space utilization of the laboratory operating table and difficulty in laboratory space management. Summary of the invention

[0003] The problem solved by the invention is that the space layout utilization rate of the existing ultra-low temperature refrigerator and the laboratory operating table is low and it is inconvenient for laboratory space management.

[0004] To solve at least one aspect of the above problems, the present invention provides an ultra-low temperature refrigerator, comprising a shell, a back plate arranged inside the shell, and a refrigeration assembly, wherein the back plate divides the internal chamber of the shell into a refrigeration chamber located in the front and an electrical chamber located in the rear, and the refrigeration assembly is arranged in the electrical chamber.

[0005] Furthermore, the shell has a front side wall, a rear side wall, a left side wall, a right side wall, a top wall and a bottom wall, and the front side wall, the rear side wall, the left side wall, the right side wall, the top wall and the bottom wall enclose the chamber, the upper end of the back plate is connected to the top wall, and the lower end of the back plate is connected to the bottom wall.

[0006] Furthermore, the width of the top wall is smaller than that of the bottom wall, and the back plate is extended downward from the rear edge of the top wall, or the width of the bottom wall is smaller than that of the top wall, and the back plate is extended upward from the rear edge of the bottom wall.

[0007] Furthermore, the height of the rear side wall is lower than that of the front side wall, a cover plate is arranged between the rear side wall and the top wall and / or the bottom wall, and a grille heat dissipation opening is arranged on the cover plate.

[0008] Furthermore, an intermediate plate is provided between the rear side wall and the back plate near the cover plate, and an air outlet is provided on the intermediate plate, and the air outlet is communicated with the grille heat dissipation port.

[0009] Furthermore, an air inlet is provided on the rear side wall.

[0010] Furthermore, the refrigeration assembly includes a compressor, a condenser, a decondenser, a shell and tube heat exchanger and an evaporator, and the shell and tube heat exchanger and the evaporator are connected via a first pipeline and a second pipeline respectively.

[0011] Furthermore, the refrigeration component also includes an oil separator, and the outlet end of the oil separator is connected to a third pipeline and a fourth pipeline, the third pipeline is used to return refrigeration oil to the compressor, and the fourth pipeline is used to return refrigerant gas to the condenser. A fifth pipeline is connected between the fourth pipeline and the second pipeline, and a first solenoid valve is arranged on the fifth pipeline.

[0012] Furthermore, the refrigeration assembly also includes a drying filter, and the drying filter is installed on the pipeline between the condenser and the partial condenser.

[0013] Furthermore, a branch pipeline leading to the compressor is connected to the pipeline between the drying filter and the partial condenser, and a second solenoid valve and a third capillary tube are installed on the branch pipeline.

[0014] Furthermore, the refrigeration assembly also includes an air storage tank, which is arranged on the return air pipeline between the decondenser and the compressor.

[0015] Compared with the prior art, the ultra-low temperature refrigerator provided by the present invention has the following beneficial effects:

[0016] In the present invention, the refrigeration system of the ultra-low temperature refrigerator is arranged at the back of the refrigerator, which greatly reduces the height of the ultra-low temperature refrigerator, so that the ultra-low temperature refrigerator can be placed under the laboratory operating table, so that the space under the operating table is effectively utilized, space is saved, the laboratory space layout is optimized, and laboratory management is convenient.

[0017] The present invention also provides an ultra-laboratory operating table, comprising a table top, wherein a cavity below the table top is used to place the ultra-low temperature refrigerator as described in any one of the above items.

[0018] Furthermore, it also includes a ventilation system, which is used to dissipate heat for the ultra-low temperature refrigerator. The ventilation system includes an air collecting hood, which is arranged at the grille heat dissipation port on the back of the ultra-low temperature refrigerator.

[0019] Furthermore, the ventilation system also includes a transverse exhaust duct, which is arranged along the length direction of the table top and is connected to the air collecting hood.

[0020] The laboratory operating table provided by the present invention has the following beneficial effects compared with the prior art:

[0021] The laboratory operating table in the present invention has an ultra-low temperature refrigerator placed under the countertop. On the one hand, it is convenient to take items from the ultra-low temperature refrigerator. On the other hand, it makes full use of the space under the operating table to avoid the space under the countertop being idle. In addition, the ultra-low temperature refrigerator in the laboratory in the prior art does not have a matching heat dissipation system, which makes the temperature of the laboratory higher. The operating table of the present invention is provided with an air collecting hood and a transverse exhaust duct connected to the air collecting hood at the grille heat dissipation port on the back of the ultra-low temperature refrigerator, which can timely discharge the hot air at the refrigerator air outlet out of the laboratory to ensure that the laboratory temperature is maintained at a certain level. And because the ultra-low temperature refrigerator is placed under the countertop, the air collecting hood and the transverse exhaust duct are also arranged under the countertop, so that only the branch exhaust duct of the entire ventilation system is exposed, which improves the overall aesthetics of the laboratory operating table. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall structural diagram of an ultra-low temperature refrigerator in an embodiment of the present invention;

[0023] Figure 2 It is a partial structural diagram of an ultra-low temperature refrigerator in an embodiment of the present invention;

[0024] Figure 3 A structural diagram of an ultra-low temperature refrigerator from another perspective in an embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of a partial structure of an ultra-low temperature refrigerator according to an embodiment of the present invention;

[0026] Figure 5 A partial structural diagram of an ultra-low temperature refrigerator from another perspective in an embodiment of the present invention;

[0027] Figure 6 It is a structural diagram of an ultra-low temperature refrigerator in another embodiment of the present invention;

[0028] Figure 7 is a front view of an ultra-low temperature refrigerator according to an embodiment of the present invention;

[0029] Figure 8 A top view of an ultra-low temperature refrigerator according to an embodiment of the present invention;

[0030] Fig. 9 It is a front view of an ultra-low temperature refrigerator in another embodiment of the present invention;

[0031] Fig.10 It is a structural diagram of a laboratory operating table in an embodiment of the present invention;

[0032] Fig.11 for Fig.10 Front view of the middle laboratory workbench;

[0033] Fig.12 for Fig.10 A top view of the laboratory workbench;

[0034] Fig.13 for Fig.10 Side view of the center laboratory workbench;

[0035] Fig.14 It is a structural diagram of a laboratory operating table in another embodiment of the present invention;

[0036] Fig.15 This is a schematic diagram of a first layout of an ultra-low temperature refrigerator and a ventilation system according to an embodiment of the present invention;

[0037] Fig.16 This is a schematic diagram of a second layout of an ultra-low temperature refrigerator and a ventilation system according to an embodiment of the present invention;

[0038] Fig.17 Schematic diagram of a third layout of an ultra-low temperature refrigerator and a ventilation system according to an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 100-ultra-low temperature refrigerator; 200-table; 201-isolation board; 202-shelf; 203-wind collecting hood; 204-lateral exhaust duct; 205-branch exhaust duct; 206-water collection table;

[0041] 1-shell; 2-back plate; 3-refrigeration assembly; 4-refrigerator door; 5-cover plate; 6-middle plate;

[0042] 11-front side wall; 12-rear side wall; 13-right side wall; 14-top wall; 15-refrigeration room; 16-electrical room;

[0043] 31-compressor; 32-condenser; 33-decondenser; 34-evaporator; 35-oil separator; 36-gas storage tank; 37-drying filter; 38-first filter; 39-first capillary; 310-tube heater; 311-first solenoid valve; 312-second capillary; 313-second solenoid valve; 314-third capillary; 315-pressure protector; 316-second filter;

[0044] 41-handle; 51-grill heat dissipation outlet; 61-air outlet;

[0045] 121-Air inlet. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0047] In the following description, the direction from the left-hand side toward the right-hand side relative to the front of the ultra-low temperature refrigerator 100 is set as the positive direction of the X-axis, the positive direction of the X-axis is right, and vice versa is left; the direction from the near front side toward the far back side is set as the positive direction of the Y-axis, the positive direction of the Y-axis is back, and vice versa is front; the vertically upward direction is set as the positive direction of the Z-axis, the positive direction of the Z-axis is up, and vice versa is down; in addition, the dimension in the X-axis direction is length, the dimension in the Y-axis direction is width, and the dimension in the Z-axis direction is height.

[0048] like Figure 1 , 3 As shown, the ultra-low temperature refrigerator 100 provided in the embodiment of the present invention is composed of: a shell 1 of a substantially rectangular shape, the shell 1 having a front side wall 11, a rear side wall 12, a left side wall, a right side wall 13, a top wall 14 and a bottom wall, a chamber is formed inside the shell 1, a refrigerator door 4 is arranged on the front side wall 11 of the shell 1, a back plate 2 is arranged between the top wall 14 and the bottom wall, the upper end of the back plate 2 is connected to the top wall 14, and the lower end of the back plate 2 is connected to the bottom wall. In one embodiment, the width of the top wall 14 of the shell 1 is smaller than the width of the bottom wall, and the back plate 2 is extended downward from the rear edge of the top wall 14 of the shell 1, such as Figure 8 As shown, the back panel 2 divides the chamber into two front and rear chambers, which respectively include a refrigeration chamber 15 located in the front and an electrical chamber 16 located in the rear. The refrigeration chamber 15 is used to store items that need to be refrigerated and frozen, and the electrical chamber 16 is used to place the refrigeration component 3 of the refrigerator.

[0049] The ultra-low temperature refrigerator 100 provided in this embodiment includes a housing 1, a back plate 2 disposed inside the housing 1, and a refrigeration assembly 3. The back plate 2 divides the internal chamber of the housing 1 into a refrigeration chamber 15 located in the front and an electrical chamber 16 located in the rear, and the refrigeration assembly 3 is disposed in the electrical chamber 16. In this way, the height of the ultra-low temperature refrigerator 100 is greatly reduced, and the ultra-low temperature refrigerator 100 can be placed under the laboratory operating table, so that the space under the operating table is truly effectively utilized, greatly improving the space utilization rate of the laboratory, optimizing the laboratory space layout, and facilitating laboratory management.

[0050] Furthermore, if Figure 2 , 4 As shown in Figures 5 and 6, the refrigeration assembly 3 includes a compressor 31, a condenser 32, a condenser 33, a shell and tube heat exchanger and an evaporator 34 which are sequentially connected through a refrigerant pipeline. Among them, the condenser 33 is equivalent to a combination of a heat exchanger and a gas-liquid separator, adapted to a single-machine mixed working medium self-cascading refrigeration cycle, and the condenser 33 is used for precooling the front end of the system shell and tube heat exchanger to improve the heat exchange efficiency, which is beneficial to the system oil return, liquid return and separation of refrigerant components with different boiling points. A pipeline with a first capillary tube 39 and a first filter 38 is connected between the condenser 33 and the shell and tube heat exchanger.

[0051] The shell and tube heat exchanger and the evaporator 34 are connected through a first pipeline and a second pipeline respectively. The low-temperature liquid refrigerant enters the evaporator 34 from the shell and tube heat exchanger through the second pipeline. The second capillary tube 312 and the second filter 316 are arranged on the second pipeline. The evaporated refrigerant gas enters the shell and tube heat exchanger through the first pipeline.

[0052] The refrigeration assembly 3 also includes an oil separator 35. The medium-high temperature and high-pressure refrigerant gas coming out of the condenser 32 enters the oil separator 35. The oil separator 35 is used to separate the refrigerant oil in the exhaust gas of the compressor 31 based on the different boiling points and density characteristics of the refrigerant and the refrigeration oil, to prevent the refrigeration oil from entering the heat exchanger and the evaporator 34 to form an oil film and reduce its heat transfer effect. At the same time, it ensures the oil return amount of the compressor 31 to ensure the lubrication and cooling of the compressor 31.

[0053] The outlet end of the oil separator 35 is connected to a third pipeline and a fourth pipeline. The third pipeline is used to return the refrigeration oil to the compressor 31 , and the fourth pipeline is used to return the refrigerant gas to the condenser 32 .

[0054] Furthermore, a pressure protector 315 is connected to the fourth pipeline at the outlet end of the oil separator 35, and a fifth pipeline is connected between the fourth pipeline and the second pipeline. A first solenoid valve 311 is provided on the fifth pipeline. The first solenoid valve 311 is in a normally closed state. After the compressor 31 has worked continuously for several hours, the first solenoid valve 311 is opened. By utilizing the pressure difference, the high-temperature and high-pressure gas will pass through the second filter to actively flush the second capillary 312 to prevent the second capillary 312 from being blocked.

[0055] The refrigeration assembly 3 further includes a filter dryer 37, which is installed on the pipeline between the condenser 32 and the partial condenser 33. The medium-temperature and high-pressure refrigerant gas separated by the oil separator 35 enters the condenser 32 for secondary condensation, and then becomes a refrigerant liquid at room temperature and high pressure, and enters the partial condenser 33 after passing through the filter dryer 37.

[0056] Furthermore, a branch pipeline leading to the compressor 31 is connected to the pipeline between the drying filter 37 and the condenser 33, and a second solenoid valve 313 and a third capillary tube 314 are installed on the branch pipeline. The second solenoid valve 313 is in a normally closed state. When the system works until the box temperature drops to the set value, the second solenoid valve 313 is opened, and the refrigerant at room temperature and high pressure is converted into room temperature and low pressure refrigerant through the third capillary tube 314, and flows back to the compressor 31 for spray cooling of the compressor 31. At the same time, part of the high-pressure refrigerant is separated, thereby reducing the initial exhaust pressure and implementing active protection for the compressor 31.

[0057] The refrigeration component 3 also includes an air storage tank 36, which is arranged on the return air pipeline between the condenser 33 and the compressor 31. Since the mixed working fluid contains a low-boiling point refrigerant, when the system stops working, the low-boiling point refrigerant at room temperature will all be vaporized into saturated vapor or superheated vapor. The corresponding saturated gas pressure is very high, exceeding the limit range of the system and the compressor 31. Therefore, the air storage tank 36 is arranged on the return air pipe so that the refrigerant enters the air storage tank 36 after shutdown, thereby reducing the system pressure.

[0058] The refrigeration principle of the ultra-low temperature refrigerator 100 of this embodiment adopts a single-stage compression multi-component mixed working medium internal cascade cycle. When working, the compressor 31 compresses the normal temperature and normal pressure refrigerant gas that has finished evaporation into high temperature and high pressure gas. The compressed high temperature and high pressure gas is condensed by the condenser 32 at the first stage, and becomes medium-high temperature and high pressure gas and enters the oil separator 35. The oil separator 35 separates the refrigerant gas and the refrigeration oil of the compressor 31. Most of the separated refrigeration oil flows back to the compressor 31. The separated medium temperature and high pressure refrigerant gas enters the condenser 32 again for secondary condensation to become normal temperature and high pressure gas. The refrigerant liquid passes through the drying filter 37 and enters the condenser 33 for oil return and shell-and-tube heat exchanger pre-cooling cycle. The refrigerant enters the shell-and-tube heat exchanger for heat exchange with the low-temperature gas that has completed evaporation, and becomes a liquid refrigerant with a lower temperature. It is throttled by the second capillary 312 to become a low-temperature and low-pressure liquid refrigerant and enters the evaporator 34. In the evaporator 34, the low-temperature and low-pressure liquid refrigerant absorbs heat and becomes a low-temperature and low-pressure gaseous refrigerant. It then undergoes self-overlapping heat exchange through the shell-and-tube exchanger and the condenser 33. The normal temperature and pressure gas after absorbing heat is slowly released through the gas storage tank 36 and flows back to the compressor 31.

[0059] like Figure 1 As shown, an air inlet 121 is provided on the rear side wall 12 of the shell 1, an intermediate plate 6 is provided between the rear side wall 12 of the shell 1 and the back plate 2, and an air outlet 61 is provided on the intermediate plate 6. In one embodiment, the air inlet 121 is provided below the middle of the rear side wall 12 of the shell 1, that is, the ultra-low temperature refrigerator 100 takes in air from the lower side of the back. Furthermore, a cover plate 5 is provided between the top edge of the rear side wall 12 of the shell 1 and the rear edge of the top wall 14 of the shell 1, and a grille heat dissipation outlet 51 is provided on the cover plate 5. The provision of the cover plate 5 has a protective effect on the air outlet 61, preventing the air outlet 61 from being blocked by external dust and dirt.

[0060] Further, the height of the rear side wall 12 of the housing 1 is lower than the height of the front side wall 11, so that the cover plate 5 is obliquely arranged between the rear side wall 12 and the top wall 14 of the housing 1, shortening the distance between the grille heat dissipation port 51 and the air outlet 61, so as to facilitate timely heat dissipation. It should be understood that since the height of the rear side wall 12 of the housing 1 is lower than the height of the front side wall 11, the cover plate 5 is arranged between the rear side wall 12 and the top wall 14 of the housing 1. When the cover plate 5 is arranged between the rear side wall 12 and the top wall 14 of the housing 1, the rear side wall 12 of the housing 1 is flush with the bottom of the front side wall 11, and the cover plate 5 is arranged between the top edge of the rear side wall 12 of the housing 1 and the rear edge of the top wall 14. When the cover plate 5 is arranged between the rear side wall 12 and the bottom wall of the housing 1, the rear side wall 12 of the housing 1 is flush with the top of the front side wall 11, and the cover plate 5 is arranged between the bottom edge of the rear side wall 12 of the housing 1 and the rear edge of the bottom wall. The rear side wall 12 of the shell 1 may also be uneven with the top and bottom of the front side wall 11. In this case, a cover plate 5 is provided between the top edge of the rear side wall 12 of the shell 1 and the rear edge of the top wall 14, and a cover plate 5 is also provided between the bottom edge of the rear side wall 12 of the shell 1 and the rear edge of the bottom wall.

[0061] In some other embodiments, the air inlet 121 is arranged above the middle of the rear side wall 12 of the housing 1, the height of the rear side wall 12 of the housing 1 is lower than the height of the front side wall 11, and the cover plate 5 is arranged between the bottom edge of the rear side wall 12 and the rear edge of the bottom wall of the housing 1. Figure 6 As shown, the ultra-low temperature refrigerator 100 takes in air from the upper side of the back and exhausts air from the lower side of the back. Of course, in some other embodiments, the height of the rear side wall 12 of the housing 1 may be equal to the height of the front side wall 11, and the width of the top wall 14 of the housing 1 is equal to the bottom wall. In this case, an air inlet 121 may be provided on the top wall 14 of the housing 1 to take in air from the top of the housing 1, and an air outlet 61 may be provided on the rear side wall 12 of the housing 1 to exhaust air from the rear of the housing 1.

[0062] Furthermore, the ultra-low temperature refrigerator 100 further includes a refrigerator door 4 and a handle 41, and the refrigerator door 4 is arranged to open in pairs. Figure 7 As shown, the handle 41 can be arranged on the two refrigerator doors 4 close to each other, such as Fig. 9 As shown, it can also be arranged at a position far away from each other on the two refrigerator doors 4. In this embodiment, the handle 41 is preferably arranged at a position far away from each other on the two refrigerator doors 4. At this time, the two refrigerator doors 4 are arranged in a push-pull form, which can effectively prevent the cold air from escaping due to excessive door opening.

[0063] Another embodiment of the present invention provides an ultra-laboratory operating table, such as Figure 10-13As shown, the laboratory operating table includes a countertop 200, and the cavity below the countertop 200 is used to place the ultra-low temperature refrigerator 100 as described in any of the above items. According to the length of the countertop 200, a plurality of ultra-low temperature refrigerators 100 are arranged in the cavity below the countertop 200, and two or more ultra-low temperature refrigerators 100 are distributed along the length direction of the countertop 200. The front of the ultra-low temperature refrigerator 100 faces outward for the convenience of users. In one specific embodiment, the height of the ultra-low temperature refrigerator 100 is designed to be 750mm, the length is 1500mm, the width is 600mm, and the height of the operating table is designed to be 800mm ± 20mm. In this way, the ultra-low temperature refrigerator 100 can be placed under the countertop 200, which improves the utilization rate of the space under the operating table, and also saves space in the laboratory, which is convenient for laboratory management.

[0064] In some embodiments, the table top 200 is relatively wide, and a partition plate 201 is provided on the table top 200 to separate the table top 200 into two front and rear areas for easy use. Of course, two table tops 200 of smaller width may also be placed side by side.

[0065] In other embodiments, Fig.14 As shown, at least one layer of shelf racks 202 is disposed on the table 200, and the shelf racks 202 are disposed along the length direction of the table 200. Further, the laboratory operating table also includes a water collection table 206 disposed at one end of the table 200.

[0066] Further, the laboratory operating table also includes a ventilation system for exhausting and cooling the ultra-low temperature refrigerator 100. The ventilation system includes an air collecting hood 203, a transverse exhaust duct 204 and a branch exhaust duct 205, wherein the air collecting hood 203 is arranged at the grille heat dissipation port 51 on the back of the ultra-low temperature refrigerator 100, and the air collecting hood 203 is used to collect the hot air discharged from the grille heat dissipation port 51 on the back of the ultra-low temperature refrigerator 100. The transverse exhaust duct 204 is connected to the air collecting hood 203, and is used to discharge the hot air collected by the air collecting hood 203. When a plurality of ultra-low temperature refrigerators 100 are arranged in the cavity below the table 200 along the length direction, an air collecting hood 203 is arranged at the grille heat dissipation port 51 on the back of each ultra-low temperature refrigerator 100, and each air collecting hood 203 is connected to the transverse exhaust duct 204, and the transverse exhaust duct 204 is extended along the length direction of the table 200, and a plurality of connection ports corresponding to the air collecting hood 203 are arranged on the transverse exhaust duct 204 along the length direction of the table 200. The cross-sectional shape of the horizontal exhaust duct 204 can be circular, square or polygonal, etc., and the cross-sectional shape of the horizontal exhaust duct 204 is not specifically limited. The branch exhaust duct 205 is vertically arranged on the table 200 and connected to the horizontal exhaust duct 204 to exhaust the hot air in the horizontal exhaust duct 204. Fig.10 The arrow direction shown in the figure indicates the exhaust route of the hot air.

[0067] In some embodiments, two ultra-low temperature refrigerators 100 are arranged back to back in the cavity below the table 200. In this case, the transverse exhaust duct 204 is arranged in the area between the backs of the ultra-low temperature refrigerators 100. Since the positions of the grille heat dissipation ports 51 at the backs of the ultra-low temperature refrigerators 100 are different, the positions of the transverse exhaust duct 204 are also different. Figure 15-17 As shown, several preferred layout modes of laboratory operating tables are given, but the present invention is not limited to these modes, and other modes based on these modes are also within the protection scope of the present invention. Figure 15-17 The arrows shown in the figure indicate the direction of the gas heat dissipation route.

[0068] Furthermore, the ventilation system also includes an exhaust fan, a main exhaust duct, and a vertical exhaust duct. The vertical exhaust duct is suspended on the floor slab, the vertical exhaust duct is connected to the branch exhaust duct 205, the main exhaust duct is connected to the vertical exhaust duct, and the hot air collected by the transverse exhaust duct 204 enters the main exhaust duct (not shown in the figure) through the branch exhaust duct 205 and the vertical exhaust duct (not shown in the figure), and is then discharged outside the building through the exhaust fan.

[0069] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An ultra-low temperature refrigerator, characterized in that: It comprises a shell (1), a back plate (2) arranged inside the shell (1), and a refrigeration assembly (3), wherein the back plate (2) divides the internal chamber of the shell (1) into a refrigeration chamber (15) located at the front and an electrical chamber (16) located at the rear, and the refrigeration assembly (3) is arranged in the electrical chamber (16); The refrigeration component (3) comprises a compressor (31), a condenser (32), a partial condenser (33), a shell and tube heat exchanger and an evaporator (34) which are connected in sequence via a refrigerant pipeline; the shell and tube heat exchanger and the evaporator (34) are connected via a first pipeline and a second pipeline respectively; low-temperature liquid refrigerant enters the evaporator (34) from the shell and tube heat exchanger via the second pipeline; a second capillary tube (312) and a second filter (316) are provided on the second pipeline; and evaporated refrigerant gas enters the shell and tube heat exchanger via the first pipeline; The refrigeration assembly (3) further comprises an oil separator (35), the outlet end of the oil separator (35) being connected to a third pipeline and a fourth pipeline, the third pipeline being used to return refrigeration oil to the compressor (31), the fourth pipeline being used to return refrigerant gas to the condenser (32), a fifth pipeline being connected between the fourth pipeline and the second pipeline, a first solenoid valve (311) being provided on the fifth pipeline, the first solenoid valve (311) being in a normally closed state, and when the compressor (31) has been working continuously for several hours, the first solenoid valve (311) is opened, and by utilizing the pressure difference, the high-temperature and high-pressure gas passes through the second filter (316) to actively flush the second capillary tube (312); The refrigeration assembly (3) further comprises an air storage tank (36), wherein the air storage tank (36) is arranged on the air return pipeline between the partial condenser (33) and the compressor (31); When in operation, the compressor (31) compresses the normal temperature and normal pressure refrigerant gas that has finished evaporation into high temperature and high pressure gas. The compressed high temperature and high pressure gas is condensed in the condenser (32) to become medium temperature and high pressure gas and enter the oil separator (35). The oil separator (35) separates the refrigerant gas and the refrigeration oil of the compressor (31). The separated medium temperature and high pressure refrigerant gas enters the condenser (32) again for secondary condensation. The low temperature and low pressure liquid refrigerant absorbs heat in the evaporator (34) to become low temperature and low pressure gaseous refrigerant. The refrigerant is then self-overlapped and heat-exchanged through the shell and tube heat exchanger and the decondenser (33). The normal temperature and normal pressure gas after absorbing heat is slowly released through the gas storage tank (36) and flows back to the compressor (31).

2. The ultra-low temperature refrigerator according to claim 1, characterized in that: The shell (1) comprises a front side wall (11), a rear side wall (12), a left side wall, a right side wall (13), a top wall (14) and a bottom wall; the front side wall (11), the rear side wall (12), the left side wall, the right side wall (13), the top wall (14) and the bottom wall enclose the chamber; the upper end of the back plate (2) is connected to the top wall (14), and the lower end of the back plate (2) is connected to the bottom wall.

3. The ultra-low temperature refrigerator according to claim 2, characterized in that: The width of the top wall (14) is smaller than the width of the bottom wall, and the back plate (2) is extended downward from the rear edge of the top wall (14); or the width of the bottom wall is smaller than the width of the top wall (14), and the back plate (2) is extended upward from the rear edge of the bottom wall.

4. The ultra-low temperature refrigerator according to claim 3, characterized in that: The height of the rear side wall (12) is lower than that of the front side wall (11); a cover plate (5) is provided between the rear side wall (12) and the top wall (14) and / or the bottom wall; and a grille heat dissipation opening (51) is provided on the cover plate (5).

5. The ultra-low temperature refrigerator according to claim 4, characterized in that: An intermediate plate (6) is provided between the rear side wall (12) and the back plate (2) near the cover plate (5), an air outlet (61) is provided on the intermediate plate (6), and the air outlet (61) is communicated with the grille heat dissipation outlet (51).

6. The ultra-low temperature refrigerator according to claim 5, characterized in that: An air inlet (121) is provided on the rear side wall (12).

7. The ultra-low temperature refrigerator according to claim 1, characterized in that: The refrigeration assembly (3) further comprises a drying filter (37), wherein the drying filter (37) is installed on a pipeline between the condenser (32) and the partial condenser (33).

8. The ultra-low temperature refrigerator according to claim 7, characterized in that: A branch pipeline leading to the compressor (31) is also connected to the pipeline between the drying filter (37) and the partial condenser (33), and a second solenoid valve (313) and a third capillary tube (314) are installed on the branch pipeline.

9. A laboratory operating table, comprising a table top (200), characterized in that: The cavity below the table top (200) is used to place the ultra-low temperature refrigerator according to any one of claims 1 to 8.

10. The laboratory operating table according to claim 9, characterized in that: It also includes a ventilation system, the ventilation system is used to dissipate heat from the ultra-low temperature refrigerator, the ventilation system includes an air collecting hood (203), and the air collecting hood (203) is arranged at a grille heat dissipation port (51) at the back of the ultra-low temperature refrigerator.

11. The laboratory operating table according to claim 10, characterized in that: The ventilation system further comprises a transverse exhaust pipe (204), wherein the transverse exhaust pipe (204) is arranged along the length direction of the table top (200), and the transverse exhaust pipe (204) is connected to the air collecting hood (203).

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