Low temperature distillation chamber

Abstract

This invention discloses a low-temperature distillation chamber, comprising an outer shell, a heat insulation screen, a liquid inlet pipe, and a suction pipe. The outer shell has a distillation chamber; the heat insulation screen is connected to the outer shell and housed inside the distillation chamber, defining the heat insulation chamber with the outer shell; the liquid inlet pipe is connected to the lower part of the outer shell and communicates with the heat insulation chamber; the suction pipe is connected to the upper part of the outer shell and communicates with the heat insulation chamber. The heat insulation screen, installed inside the distillation chamber, reflects external thermal radiation, thereby reducing radiative heat loss, lowering heat loss, and improving refrigeration efficiency.

Description

Technical Field

[0001] This invention relates to the field of dilution and refrigeration technology, and in particular to a low-temperature distillation chamber. Background Technology

[0002] In the field of dilution refrigeration technology, the low-temperature distillation chamber is an important component for maintaining and controlling the circulation flow. In related technologies, the low-temperature distillation chamber suffers from significant heat loss due to thermal radiation during operation, resulting in low refrigeration efficiency. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a low-temperature distillation chamber that can reduce heat loss and improve refrigeration efficiency.

[0004] The low-temperature distillation chamber provided in this embodiment of the invention includes an outer shell, a heat insulation screen, a liquid inlet pipe, and a suction pipe. The outer shell has a distillation chamber. The heat insulation screen is connected to the lower part of the outer shell and housed inside the distillation chamber. The heat insulation screen and the inner wall of the outer shell define the heat insulation chamber. The liquid inlet pipe is connected to the lower part of the outer shell and communicates with the heat insulation chamber. The suction pipe is connected to the upper part of the outer shell and communicates with the heat insulation chamber.

[0005] The low-temperature distillation chamber provided in this embodiment of the invention has at least the following beneficial effects: a heat insulation screen is installed inside the distillation chamber, which can reflect external heat radiation, thereby reducing radiative heat leakage, lowering heat loss, and improving refrigeration efficiency.

[0006] In some embodiments of the present invention, the low-temperature distillation chamber further includes a temperature control component, which includes a temperature sensor and a first heater. The temperature sensor and the first heater are both connected to the outer casing. The temperature sensor can acquire the temperature information of the distillation chamber, and the first heater is used to adjust the temperature inside the distillation chamber according to the temperature information.

[0007] In some embodiments of the present invention, the temperature sensor and the first heater are both connected to the side of the housing away from the heat insulation cavity.

[0008] In some embodiments of the present invention, the temperature control component further includes a second heater and a throat tube, the throat tube being connected to the upper part of the heat insulation screen, the air intake tube, the throat tube and the heat insulation cavity being connected in sequence, the second heater being connected to the throat tube, and the second heater being used to adjust the temperature of the throat tube.

[0009] In some embodiments of the present invention, the heat insulation screen has a connecting hole, and the distillation chamber and the heat insulation chamber are connected through the connecting hole.

[0010] In some embodiments of the present invention, a reflux pipe is further included, the reflux pipe comprising an inlet section, a heat exchange section and an outlet section connected in sequence, one end of the inlet section being connected to the upper part of the outer shell, the heat exchange section being housed in the heat insulation cavity, and one end of the outlet section being connected to the lower part of the outer shell.

[0011] In some embodiments of the present invention, the heat exchange section is in the shape of a spiral disk.

[0012] In some embodiments of the present invention, the heat exchange section is in contact with the inner wall of the outer casing.

[0013] In some embodiments of the present invention, a heat exchange groove is formed on the inner wall of the outer shell, the heat exchange section is embedded in the heat exchange groove, and the heat exchange section contacts the groove wall of the heat exchange groove.

[0014] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0016] Figure 1 A schematic diagram of a low-temperature distillation chamber for some embodiments of the first aspect of the present invention;

[0017] Figure 2 for Figure 1 A cross-sectional view of the low-temperature distillation chamber shown;

[0018] Figure 3 for Figure 1 The top view of the reflux pipe of the low-temperature distillation chamber is shown.

[0019] Figure label:

[0020] The system includes a low-temperature distillation chamber 100, an outer shell 110, a distillation chamber 111, a top cover 112, a side plate 113, a bottom plate 114, a heat exchange tank 1141, a heat insulation screen 120, a heat insulation cavity 121, a connecting hole 122, a liquid inlet pipe 130, a suction pipe 140, a temperature control component 150, a temperature sensor 151, a first heater 152, a second heater 153, a throat 154, a reflux pipe 160, an inlet section 161, a heat exchange section 162, and an outlet section 163. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] In the description of this invention, references to terms such as "one embodiment," "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The low-temperature distillation chamber 100 provided in the first aspect embodiment of the present invention includes a shell 110, a heat insulation screen 120, a liquid inlet pipe 130, and a suction pipe 140. The shell 110 has a distillation chamber 111. The heat insulation screen 120 is connected to the lower part of the shell 110 and is housed inside the distillation chamber 111. The heat insulation screen 120 and the inner wall of the shell 110 define the heat insulation chamber 121. The liquid inlet pipe 130 is connected to the lower part of the shell 110 and communicates with the heat insulation chamber 121. The suction pipe 140 is connected to the upper part of the shell 110 and communicates with the heat insulation chamber 121.

[0026] For example, such as Figure 1 and Figure 2 As shown, the low-temperature distillation chamber 100 includes an outer shell 110, a heat insulation screen 120, a liquid inlet pipe 130, and a suction pipe 140. The outer shell 110 has a distillation chamber 111. The heat insulation screen 120 is connected to the lower part of the outer shell 110 and housed inside the distillation chamber 111. The heat insulation screen 120 and the inner wall of the outer shell 110 define the heat insulation chamber 121. The liquid inlet pipe 130 is connected to the lower part of the outer shell 110 and communicates with the heat insulation chamber 121. The suction pipe 140 is connected to the upper part of the outer shell 110 and communicates with the heat insulation chamber 121.

[0027] The heat insulation cavity 121 contains 3 He dilution phase 3 He- 4 He mixed liquid, due to 3He's saturated vapor pressure is much greater than 4 The saturated vapor pressure of He, the suction pipe 140 draws air into the heat insulation cavity 121, and can first draw away... 3 He vapor, after being cooled and liquefied in the remaining components, is then replenished into the insulation chamber 121. 3 He dilution phase 3 He- 4 In a mixed liquid, to achieve 3 The He cycle achieves refrigeration through a phase change during the cycle. During this operation, external thermal radiation can affect the low-temperature distillation chamber 100, potentially causing heat leakage and resulting in low refrigeration efficiency. Therefore, a heat insulation screen 120 is installed inside the distillation chamber 111. The heat insulation screen 120 reflects external thermal radiation, thereby reducing radiative heat leakage, lowering the amount of heat lost, and improving refrigeration efficiency.

[0028] It is understood that the outer casing 110 can be composed of a top cover 112, side plates 113, and a bottom plate 114. The material of the outer casing 110 is not limited. For example, the top cover 112 and side plates 113 can be made of stainless steel, which can reduce heat conduction and prevent cold air from rising into the distillation chamber 111. The bottom plate 114 can be made of oxygen-free copper, which has good thermal conductivity, facilitating heat exchange and temperature control within the distillation chamber 111. The heat insulation screen 120 should be made of a material with high thermal reflectivity, such as copper or aluminum with high surface smoothness. Oxygen-free copper with a smooth surface can be used, as its high thermal reflectivity effectively reflects external heat radiation, reducing heat loss and improving refrigeration efficiency. Oxygen-free copper also has good thermal conductivity, enabling it to maintain a relatively stable low temperature.

[0029] In some embodiments of the present invention, the low-temperature distillation chamber 100 further includes a temperature control component 150, which includes a temperature sensor 151 and a first heater 152. The temperature sensor 151 and the first heater 152 are both connected to the housing 110. The temperature sensor 151 can acquire the temperature information of the distillation chamber 111, and the first heater 152 is used to adjust the temperature inside the distillation chamber 111 according to the temperature information.

[0030] For example, such as Figures 1 to 2 As shown, the low-temperature distillation chamber 100 also includes a temperature control component 150, which includes a temperature sensor 151 and a first heater 152. Both the temperature sensor 151 and the first heater 152 are connected to the outer casing 110. The temperature sensor 151 can acquire the temperature information of the distillation chamber 111, and the first heater 152 is used to adjust the temperature inside the distillation chamber 111 according to the temperature information. The temperature can be adjusted by adjusting the temperature inside the distillation chamber 111. 3 The evaporation flow rate of He steam is adjusted to regulate the overall circulation flow rate.

[0031] Understandably, the temperature sensor 151 can be a thermocouple, a resistance temperature measuring instrument, etc., and can be selected according to actual usage requirements. The first heater 152 can be a resistance heater, etc.

[0032] In some embodiments of the present invention, the temperature sensor 151 and the first heater 152 are both connected to the side of the housing 110 away from the heat insulation cavity 121.

[0033] For example, such as Figures 1 to 2 As shown, the temperature sensor 151 and the first heater 152 are both connected to the side of the housing 110 away from the heat insulation cavity 121, which facilitates the maintenance and replacement of the temperature sensor 151 and the first heater 152.

[0034] Understandable, 3 He dilution phase 3 He- 4 The mixed liquid is contained in the heat insulation cavity 121 and located above the base plate 114, so the temperature sensor 151 can be connected to the base plate 114 to obtain more accurate temperature data. 3 He dilution phase 3 He- 4 He can obtain the temperature information of the mixed liquid; the first heater 152 can be connected to the base plate 114, thereby allowing for more direct control of the temperature of the mixed liquid. 3 He dilution phase 3 He- 4 He is used to heat the mixed liquid, thereby improving the accuracy of temperature control and allowing for more precise adjustment of the circulation flow rate. The base plate 114 can be made of oxygen-free copper, which has good thermal conductivity and can further improve the performance of the temperature sensor 151. 3 He dilution phase 3 He- 4 The accuracy of temperature measurement of the mixed liquid is improved, and the first heater 152 can be further enhanced. 3 He dilution phase 3 He- 4 He improves the accuracy of temperature control of the mixed liquid, thereby further enhancing the control precision of the circulating flow rate.

[0035] In some embodiments of the present invention, the temperature control component 150 further includes a second heater 153 and a throat 154. The throat 154 is connected to the upper part of the heat insulation screen 120. The air intake pipe 140, the throat 154 and the heat insulation cavity 121 are connected in sequence. The second heater 153 is connected to the throat 154 and is used to adjust the temperature of the throat 154.

[0036] For example, such as Figures 1 to 2As shown, the temperature control assembly 150 also includes a second heater 153 and a throat 154. The throat 154 is connected to the upper part of the heat insulation screen 120. The intake pipe 140, the throat 154, and the heat insulation cavity 121 are connected in sequence. The second heater 153 is connected to the throat 154 and is used to adjust the temperature of the throat 154. When the temperature drops to 2.17K, 4 The liquid will transform into a superfluid, capable of climbing along the inner wall of the heat shield 120, entering the intake pipe 140 via the throat 154, causing... 4 He's overflow loss and heat leakage loss reduce refrigeration efficiency and may even affect the normal operation of the refrigeration unit. A second heater 153 is connected to the throat 154. The second heater 630 can heat the throat 154. 4 When the superfluid He ascends to position 154 in the throat, due to the temperature increase... 4 He superfluid will revert to 4 The liquid flows back into the insulation cavity 121, thereby reducing... 4 He's overflow loss and heat leakage loss during the process ensure the normal operation of the refrigeration unit.

[0037] It is understandable that the second heater 153 can be a heating wire. The second heater 153 is wound around the throat 154 to ensure that the throat 154 is heated evenly, thus preventing… 4 The superfluid ascends along the throat 154 into the intake tube 140. The throat 154 can be made of oxygen-free copper, which has good thermal conductivity. Using oxygen-free copper to make the throat 154 allows the second heater 153 to heat the throat 154 from its outer wall. The temperature of the outer wall of the throat 154 can be relatively close to that of the inner wall, which can improve the heating efficiency of the second heater 153 and save energy.

[0038] In some embodiments of the present invention, the heat insulation screen 120 is provided with a communication hole 122, and the distillation chamber 111 and the heat insulation chamber 121 are connected through the communication hole 122.

[0039] For example, such as Figures 1 to 2 As shown, the heat insulation screen 120 has a connecting hole 122, through which the distillation chamber 111 and the heat insulation chamber 121 are connected, and the heat insulation screen 120 can be partially immersed in the heat insulation chamber. 3 He dilution phase 3 He- 4 In a liquid mixture, heat can be reflected from the outside while maintaining a low temperature, further reducing heat loss and improving refrigeration efficiency.

[0040] Understandably, the size and number of the connecting holes 122 are not limited, as long as the heat insulation screen 120 can be partially submerged in water. 3 He dilution phase 3He- 4 While ensuring thermal insulation in the mixed liquid, the configuration can be adjusted according to actual usage requirements. The connecting hole 122 should be located on the heat insulation screen 120 near the base plate 114 to ensure... 3 He dilution phase 3 He- 4 The mixed liquid can partially submerge the heat insulation screen 120. The heat insulation screen 120 can be made of oxygen-free copper, which has good thermal conductivity and is suitable for immersion in... 3 He dilution phase 3 He- 4 In He mixed liquids, it can maintain a relatively stable low temperature state.

[0041] In some embodiments of the present invention, the low-temperature distillation chamber further includes a reflux pipe 160, which includes an inlet section 161, a heat exchange section 162 and an outlet section 163 connected in sequence. One end of the inlet section 161 is connected to the upper part of the outer shell 110, the heat exchange section 162 is housed in the heat insulation cavity 121, and one end of the outlet section 163 is connected to the lower part of the outer shell 110.

[0042] For example, such as Figures 1 to 2 As shown, the reflux pipe 160 includes an inlet section 161, a heat exchange section 162, and an outlet section 163 connected in sequence. One end of the inlet section 161 is connected to the upper part of the outer shell 110, the heat exchange section 162 is housed in the insulation cavity 121, and one end of the outlet section 163 is connected to the lower part of the outer shell 110. The heat exchange section 162 is disposed within the insulation cavity 121, and the reflux... 3 He steam enters the heat exchange section 162 through the inlet section 161, and is kept in the low-temperature environment of the insulation chamber 121. 3 He vapor gradually condenses into 3 The liquid is then discharged through the outlet section 163. The reflux pipe 160 is partially housed inside the low-temperature distillation chamber 100, utilizing the low temperature of the chamber 100 for distillation. 3 Cooling with steam can improve the utilization rate of cooling capacity.

[0043] Understandably, to ensure the heat exchange efficiency of heat exchange section 162, heat exchange section 162 should be immersed in the 3He dilution phase. 3 He - 4 He is mixed in the liquid.

[0044] In some embodiments of the present invention, the heat exchange section 162 is in the shape of a spiral disk.

[0045] For example, such as Figure 3 As shown, the heat exchange section 162 is spiral-shaped. The spiral-shaped heat exchange section 162 has a large heat exchange area and good heat exchange effect, which is beneficial to the return pipe 160. 3 He has a high efficiency in steam cooling and liquefaction, and can maintain3 He's smooth cycle.

[0046] Understandably, there are no restrictions on the size and winding method of the heat exchange section 162. The longer the heat exchange section 162 is, the larger the heat exchange area will be, and it can be set according to actual usage requirements.

[0047] In some embodiments of the present invention, the heat exchange section 162 is in contact with the inner wall of the housing 110.

[0048] For example, such as Figure 2 As shown, the heat exchange section 162 can contact the inner wall of the outer casing 110, and the heat exchange section 162 contains... 3 He releases heat during the liquefaction of steam, and this heat can be diffused to the outside through the outer shell 110, thereby reducing heat loss. 3 The heat released during the steam cooling liquefaction process has an effect on... 3 He dilution phase 3 He- 4 He improves refrigeration efficiency by influencing the mixture of liquids.

[0049] Understandably, referring to Figure 2 The heat exchange section 162 can contact the base plate 114 to ensure that the heat exchange section 162 is submerged in water. 3 He dilution phase 3 He- 4 He is a mixed liquid. The base plate 114 can be made of oxygen-free copper. Oxygen-free copper has good thermal conductivity, which can further improve the heat exchange efficiency of the heat exchange section 162.

[0050] In some embodiments of the present invention, the inner wall of the outer shell 110 is provided with a heat exchange groove 1141, the heat exchange section 162 is embedded in the heat exchange groove 1141, and the heat exchange section 420 contacts the groove wall of the heat exchange groove 1141.

[0051] For example, such as Figure 2 As shown, a heat exchange groove 1141 is formed on the inner wall of the outer shell 110, and the heat exchange section 162 is embedded in the heat exchange groove 1141. The heat exchange section 162 contacts the groove wall of the heat exchange groove 1141, which can further increase the contact area between the heat exchange section 162 and the bottom plate 114, further improve the heat exchange efficiency, and enhance the heat exchange performance. 3 He steam cooling liquefaction efficiency.

[0052] Understandably, referring to Figure 2 The heat exchange tank 1141 can be opened on the base plate 114, and the heat exchange section 162 can be opened on the base plate 114. 3 He releases heat during the liquefaction of steam, and this heat can be diffused to the outside through the bottom plate 114, thereby reducing heat loss. 3 The heat released during the steam cooling liquefaction process has an effect on... 3 He dilution phase 3 He-4 The influence of the mixed liquid can improve refrigeration efficiency. Oxygen-free copper can be used to make the base plate 114, as oxygen-free copper has good thermal conductivity, which can further improve the heat exchange efficiency of the heat exchange section 162.

[0053] The following is for reference. Figures 1 to 3 The cryogenic distillation chamber 100 according to an embodiment of the present invention is described in detail with reference to a complete example. It is to be understood that the following description is merely illustrative and not intended to limit the specific scope of the invention.

[0054] Reference Figure 1 and Figure 2 The low-temperature distillation chamber 100 includes an outer shell 110, a heat insulation screen 120, a liquid inlet pipe 130, a suction pipe 140, and a temperature control component 150.

[0055] The outer casing 110 includes a top cover 112, a side plate 113, and a bottom plate 114, which define a distillation chamber 111. The top cover 112 and the side plate 113 are made of stainless steel, and the bottom plate 114 is made of oxygen-free copper.

[0056] The heat shield 120 is connected to the base plate 114 and housed inside the distillation chamber 111. The heat shield 120 and the base plate 114 define the heat shield 121. A connecting hole 122 is provided at the lower part of the heat shield 120, through which the heat shield 121 and the distillation chamber 111 are connected. The heat shield 120 is made of oxygen-free copper.

[0057] The liquid inlet pipe 130 is connected to the base plate 114 and the liquid inlet pipe 130 is connected to the heat insulation cavity 121.

[0058] The suction pipe 140 is connected to the top cover 112 and the suction pipe 140 is connected to the heat insulation cavity 121.

[0059] The temperature control assembly 150 includes a temperature sensor 151, a first heater 152, a second heater 153, and a throat 154. The temperature sensor 151 and the first heater 152 are both connected to the side of the base plate 114 away from the distillation chamber 111. The temperature sensor 151 can acquire the temperature information of the distillation chamber 111. The first heater 152 is used to adjust the temperature inside the distillation chamber 111. The throat 154 is connected to the top of the heat insulation screen 120, and the suction pipe 140, the throat 154, and the heat insulation chamber 121 are sequentially connected. The second heater 153 is coiled around the outer wall of the throat 154 and is used to adjust the temperature of the throat 154. The throat 154 is made of oxygen-free copper.

[0060] The return pipe 160 includes an inlet section 161, a heat exchange section 162, and an outlet section 163 connected in sequence. One end of the inlet section 161 is connected to the top cover 112. The heat exchange section 162 is housed in a heat exchange groove 1141 opened on the bottom plate 114. The heat exchange section 162 is spiral-shaped. One end of the outlet section 163 is connected to the bottom plate 114.

[0061] The heat insulation cavity 121 contains 3 He dilution phase 3 He- 4 He mixed liquid, due to 3 He's saturated vapor pressure is much greater than 4 The saturated vapor pressure of He, the suction pipe 140 draws air into the heat insulation cavity 121, and can first draw away... 3 He vapor, after being cooled and liquefied in the remaining components, is then replenished into the insulation chamber 121. 3 He dilution phase 3 He- 4 In a mixed liquid, to achieve 3 The He cycle achieves refrigeration through a phase change during the cycle. The heat shield 120 of the low-temperature distillation chamber 100 can reflect external thermal radiation, thereby reducing radiative heat loss, lowering heat loss, and improving refrigeration efficiency.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A low-temperature distillation chamber, characterized in that, include: The outer casing has a distillation chamber; A heat insulation screen, connected to the lower part of the outer casing and housed inside the distillation chamber, defines a heat insulation cavity with the inner wall of the outer casing. The heat insulation cavity is used to accommodate [a specific component / function]. 3 He dilution phase 3 He- 4 He mixed liquid; A liquid inlet pipe is connected to the lower part of the outer shell and communicates with the heat insulation cavity; An air intake pipe is connected to the upper part of the outer shell and communicates with the heat insulation cavity. The air intake pipe is capable of sucking up the contents of the heat insulation cavity. 3 He steam.

2. The low-temperature distillation chamber according to claim 1, characterized in that, It also includes a temperature control component, which includes a temperature sensor and a first heater. The temperature sensor and the first heater are both connected to the housing. The temperature sensor can acquire the temperature information of the distillation chamber, and the first heater is used to adjust the temperature inside the distillation chamber according to the temperature information.

3. The low-temperature distillation chamber according to claim 2, characterized in that, Both the temperature sensor and the first heater are connected to the side of the housing away from the heat insulation cavity.

4. The low-temperature distillation chamber according to claim 2, characterized in that, The temperature control assembly also includes a second heater and a throat tube. The throat tube is connected to the upper part of the heat insulation screen. The air intake tube, the throat tube, and the heat insulation cavity are connected in sequence. The second heater is connected to the throat tube and is used to adjust the temperature of the throat tube.

5. The low-temperature distillation chamber according to claim 1, characterized in that, The heat insulation screen has a connecting hole, and the distillation chamber and the heat insulation chamber are connected through the connecting hole.

6. The low-temperature distillation chamber according to claim 1, characterized in that, It also includes a reflux pipe, which comprises an inlet section, a heat exchange section and an outlet section connected in sequence. One end of the inlet section is connected to the upper part of the outer shell, the heat exchange section is housed in the insulation cavity, and one end of the outlet section is connected to the lower part of the outer shell.

7. The low-temperature distillation chamber according to claim 6, characterized in that, The heat exchange section is in the shape of a spiral disc.

8. The low-temperature distillation chamber according to claim 6 or 7, characterized in that, The heat exchange section is in contact with the inner wall of the outer casing.

9. The low-temperature distillation chamber according to claim 8, characterized in that, The inner wall of the outer shell is provided with a heat exchange groove, and the heat exchange section is embedded in the heat exchange groove and contacts the groove wall of the heat exchange groove.

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