Internal tube structure and refrigeration equipment

Abstract

This invention relates to an internal tube structure and a refrigeration device. The internal tube structure includes an outer tube and an inner tube. The outer tube includes a large-diameter section, a transition section, and a connecting section. The outer tube has a first cavity extending from the large-diameter section through the transition section to a portion of the connecting section. The inner tube is inserted into the connecting section from its axial end face and extends into the first cavity. The inner tube has a second cavity, and the diameter of the transition section gradually increases from the large-diameter section towards the connecting section. By connecting the inner tube to the connecting end, vibration energy can be transmitted from the connecting end to the transition section and the large-diameter section. The gradual change in the cross-section of the transition section dissipates and weakens the vibration energy during transmission as the cross-sectional area decreases. When the refrigerant enters the first cavity from the second cavity, the noise generated is dissipated and weakened at the transition section, thereby improving the vibration reduction and noise reduction performance of the internal tube structure and the refrigeration device.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to an internal tube structure and refrigeration equipment. Background Technology

[0002] Refrigeration equipment such as refrigerators and freezers are indispensable household appliances. As people's living standards improve, their demands for refrigeration equipment are also increasing. For example, the internal tube structure is a common connection between the capillary tube and the evaporator tube. When the refrigerant enters the evaporator tube from the capillary tube, i.e., flows through the internal tube structure, a violent gas-liquid phase change occurs. This results in significant noise from the refrigerant flow and the compressor, affecting the overall quality of the refrigeration equipment.

[0003] Currently, in the refrigeration systems of related refrigeration equipment, the internal insertion tube structure usually adopts the method of directly inserting a small-diameter tube into another sleeve. The structural design of the connection position between the sleeve and the small-diameter tube is unreasonable, the vibration reduction and noise reduction effect is limited, and the service life of the product is affected. Summary of the Invention

[0004] The purpose of this invention is to provide an internal tube structure and a refrigeration device to improve the internal tube structure of refrigeration devices in related technologies and enhance the vibration reduction and noise reduction performance of the internal tube structure and the refrigeration device.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] According to one aspect of the present invention, an internal cannula structure is provided, comprising an outer tube and an inner tube; the outer tube comprises a large-diameter section, a transition section, and a connecting section connected sequentially along an axial direction; the outer tube has a first cavity, which extends through the large-diameter section, through the transition section, and into the connecting section, with a gap between the first cavity and the axial end face of the connecting section; the inner tube is inserted axially into the connecting section from the axial end face of the connecting section and extends into the first cavity; the inner tube has a second cavity, which communicates with the first cavity; wherein the diameter of the large-diameter section is a first diameter, the diameter of the connecting section is a second diameter, and the second diameter is larger than the first diameter; in the direction from the large-diameter section toward the connecting section, the diameter of the transition section gradually increases from the first diameter to the second diameter.

[0007] In some embodiments of this application, the outer peripheral wall of the transition segment is curved, and the height of the curved surface of the transition segment conforms to the acoustic black hole formula: y = 0.06x 3 Where y is the height of the curved surface position of the gradient segment protruding from the outer wall of the large-diameter segment, and x is the distance between the curved surface position of the gradient segment and the large-diameter segment.

[0008] In some embodiments of this application, a first vibration damping sleeve is fitted on the outer peripheral wall at the connection between the gradient section and the large-diameter section.

[0009] In some embodiments of this application, a first annular groove is recessed on the outer peripheral wall at the connection between the gradient section and the large-diameter section to cooperate with the first vibration damping sleeve; the first vibration damping sleeve is sleeved on the first annular groove, and the wall thickness of the first vibration damping sleeve is greater than or equal to the depth of the first annular groove.

[0010] In some embodiments of this application, the inner tube is located on the side of the transition section away from the large-diameter section, and the end face of the inner tube extending into the first lumen is arranged at an interval from the transition section.

[0011] In some embodiments of this application, the connecting segment is provided with an axially extending shaft hole, which extends from the axially away end face of the connecting segment toward the first tube cavity and communicates with the first tube cavity; one end of the inner tube is inserted into the connecting segment through the shaft hole and extends into the first tube cavity, and the outer wall of the inner tube is sealed to the shaft hole.

[0012] In some embodiments of this application, the end of the first lumen extending into the connecting section is formed with a curved section, the curved section being spaced apart on the side of the transition section away from the large-diameter section; the inner diameter of the curved section gradually decreases in the direction from the large-diameter section toward the connecting section.

[0013] In some embodiments of this application, the first cavity includes a circular tube segment extending axially, and a curved segment is formed at the end of the circular tube segment. The peripheral wall of the curved segment is curved, and the height of the curved segment conforms to the acoustic black hole formula: y = 0.06x 3 Where y is the height of the curved surface segment protruding from the circumference of the circular pipe segment, and x is the distance between the curved surface segment and the circular pipe segment.

[0014] In some embodiments of this application, a microporous plate is provided inside the first cavity. The microporous plate is sealed and fitted onto the inner tube and is located on the side of the curved section near the gradient section. The peripheral sidewall of the microporous plate is sealed and connected to the peripheral wall of the first cavity. A vibration damping cavity is formed between the microporous plate and the inner wall of the curved section. The microporous plate is densely covered with a plurality of axially penetrating perforations, which are connected to the vibration damping cavity.

[0015] In some embodiments of this application, a second vibration damping sleeve is provided on the outer peripheral wall of the connecting segment. The second vibration damping sleeve is disposed on the outer periphery of the curved segment, and the second vibration damping sleeve at least covers the connection between the curved segment and the circular pipe segment.

[0016] In some embodiments of this application, a second annular groove is recessed on the outer peripheral wall of the connecting segment to cooperate with the second vibration damping sleeve, and the second vibration damping sleeve is sleeved on the second annular groove.

[0017] In some embodiments of this application, a sound-absorbing plate is provided inside the first cavity, and the sound-absorbing plate and the end face of the inner tube extending into the first cavity are arranged axially spaced relative to each other. The center of the sound-absorbing plate is provided with a through hole arranged directly opposite to the second cavity. A sound-absorbing channel is provided inside the sound-absorbing plate, and an inlet hole communicating with the sound-absorbing channel is provided on the peripheral side wall of the through hole. An outlet hole communicating with the sound-absorbing channel is provided on the side wall of the sound-absorbing plate facing away from the inner tube.

[0018] In some embodiments of this application, multiple sound-absorbing channels are provided, and the multiple sound-absorbing channels are arranged in the sound-absorbing plate with intervals between each other; multiple sound inlets are provided on the peripheral sidewall of the through hole, and the multiple sound inlets are connected to the multiple sound-absorbing channels one by one; multiple sound outlets are provided on the sidewall of the sound-absorbing plate opposite to the inner tube, and the multiple sound outlets are connected to the multiple sound-absorbing channels one by one.

[0019] In some embodiments of this application, the sound-absorbing plate is arranged perpendicular to the axial direction of the first cavity, and the outer peripheral wall of the sound-absorbing plate is sealed to the inner peripheral wall of the first cavity.

[0020] In some embodiments of this application, the sound-absorbing plate is disposed in the first cavity at the connection between the gradient section and the connecting section.

[0021] In some embodiments of this application, the sound-absorbing plate includes an outlet plate, a channel plate, and a solid plate that are sequentially attached and connected along the axial direction; the solid plate is disposed on the side of the channel plate facing the inner tube, and the outlet plate is disposed on the side of the channel plate facing away from the inner tube; the through hole sequentially penetrates the solid plate, the channel plate, and the sound-absorbing plate; the sound-absorbing channel is formed on the channel plate, and the sound inlet hole is disposed on the inner wall of the channel plate near the through hole; the sound outlet hole is disposed on the outlet plate.

[0022] In some embodiments of this application, the channel plate is provided with arc-shaped ribs arranged around its axis, and multiple arc-shaped ribs are provided, which are arranged in a radially outward manner at intervals; the gaps between adjacent arc-shaped ribs are connected in sequence to form the sound-absorbing channel.

[0023] According to another aspect of the present invention, the present invention also provides a refrigeration device comprising the above-described internal tube structure.

[0024] The embodiments of the present invention have the following advantages and positive effects: In the inner tube structure of the present invention, the outer tube is arranged as a large-diameter section, a transition section and a connecting section connected sequentially along the axial direction. The first cavity inside the outer tube extends from the large-diameter section through the transition section to part of the connecting section. The inner tube is inserted axially into the connecting end from the end face of the connecting section and extends into the first cavity. Therefore, the vibration energy of the inner tube can be transmitted from the connecting end to the transition section and the large-diameter section. The vibration energy can be dissipated and weakened during the vibration transmission process from large to small cross-sectional area. At the same time, the axial end face of the first cavity and the connecting section are spaced apart, which can effectively ensure the structural connection strength between the inner tube and the connecting section. Furthermore, the second cavity of the inner tube is connected to the first cavity. When the refrigerant enters the first cavity from the second cavity, the noise generated by the refrigerant can be dissipated and weakened at the transition section, thereby improving the vibration reduction and noise reduction performance of the inner tube structure and the refrigeration equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal cannula structure according to an embodiment of the present invention.

[0026] Figure 2 yes Figure 1 The front view.

[0027] Figure 3 yes Figure 1 A cross-sectional view.

[0028] Figure 4 yes Figure 3 A schematic diagram of its breakdown.

[0029] Figure 5 yes Figure 1 A schematic diagram of its breakdown.

[0030] Figure 6 yes Figure 3 The front view.

[0031] Figure 7 yes Figure 6 A magnified structural diagram of region A in the middle.

[0032] Figure 8 yes Figure 6 A magnified structural diagram of region B in the middle.

[0033] Figure 9 yes Figure 3 A schematic diagram of the structure of a microporous plate.

[0034] Figure 10 yes Figure 3 A schematic diagram of the structure of the sound-absorbing panel.

[0035] Figure 11 yes Figure 10A schematic diagram of its decomposition.

[0036] Figure 12 yes Figure 10 Another breakdown diagram.

[0037] Figure 13 yes Figure 12 Front view of the central channel plate.

[0038] The reference numerals in the attached drawings are explained as follows: 1. Outer tube; 10. First cavity; 100. Vibration damping cavity; 101. Curved section; 102. Circular tube section; 11. Large diameter section; 12. Gradient section; 13. Connecting section; 131. Shaft hole; 14. First annular groove; 15. Second annular groove; 2. Inner tube; 20. Second cavity; 3. First vibration damping sleeve; 4. Second vibration damping sleeve; 5. Micro-perforated plate; 51. Perforation; 6. Sound-absorbing plate; 60. Through hole; 61. Solid plate; 62. Channel plate; 620. Sound-absorbing channel; 621. Sound inlet hole; 622. Arc-shaped rib; 63. Outlet plate; 631. Sound outlet hole. Detailed Implementation

[0039] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Currently, in the refrigeration systems of related refrigeration equipment, the internal insertion tube structure usually adopts the method of directly inserting a small-diameter tube into another sleeve. The structural design of the connection position between the sleeve and the small-diameter tube is unreasonable, the vibration reduction and noise reduction effect is limited, and the service life of the product is affected.

[0044] Figure 1 This is a schematic diagram of the internal cannula structure according to an embodiment of the present invention. Figure 2 yes Figure 1 The front view. Figure 3 yes Figure 1 A cross-sectional view. Figure 4 yes Figure 3 A schematic diagram of its breakdown. Figure 5 yes Figure 1 A schematic diagram of its breakdown.

[0045] Please see Figures 1 to 5 As shown, the internal tube structure provided in this embodiment of the invention mainly includes an outer tube 1, an inner tube 2, a first vibration damping sleeve 3, a second vibration damping sleeve 4, a microporous plate 5, and a sound-absorbing plate 6.

[0046] The outer tube 1 has a large-diameter pipe structure and a first cavity 10 is formed inside it, which can be used for refrigerant flow. The outer tube 1 is used to connect with the inner tube 2, so that the inner tube 2 extends into the first cavity 10 of the outer tube 1.

[0047] The outer tube 1 includes a large-diameter section 11, a transition section 12, and a connecting section 13 connected sequentially along the axial direction. The large-diameter section 11 is a large-diameter tubular structure, and the first lumen 10 is mainly formed within the large-diameter section 11. The transition section 12 has an annular structure, and the first lumen 10 extends from the large-diameter section 11 through the transition section 12 into part of the connecting section 13. At the same time, there is a gap between the first lumen 10 and the axial end face of the connecting section 13 away from the large-diameter section 11.

[0048] The inner tube 2 is a small tube structure, and a second cavity 20 is formed inside the outer tube 1. The second cavity 20 is also used for refrigerant flow. The inner diameter of the second cavity 20 is smaller than the inner diameter of the first cavity 10. Therefore, when the inner tube 2 extends into the first cavity 10 of the outer tube 1, the second cavity 20 can communicate with the first cavity 10. The refrigerant can flow from the second cavity 20 to the first cavity 10. At the same time, due to the sudden increase in the inner diameter of the cavity, a violent gas-liquid phase change can occur at the connection between the second cavity 20 and the first cavity 10, causing the refrigerant to generate flow and ejection noise.

[0049] Please see Figure 3 As shown, the inner tube 2 is inserted axially into the connecting section 13 from the axial end face of the connecting section 13 away from the large diameter section 11, and the inner tube 2 extends into the first cavity 10.

[0050] In some embodiments, the connecting segment 13 is a small-diameter tubular structure, and the connecting segment 13 is provided with an axially extending shaft hole 131. The shaft hole 131 extends from the end face of the connecting segment 13 away from the axial direction toward the first cavity 10 until the shaft hole 131 communicates with the first cavity 10. The inner diameter of the shaft hole 131 is smaller than the inner diameter of the first cavity 10. Since the first cavity 10 extends into a portion of the connecting segment 13, the length of the shaft hole 131 is less than the length of the connecting segment 13. It should be noted that the length of the shaft hole 131 can be adjusted as needed, and is not limited here.

[0051] Please see Figure 3 and Figure 4 As shown, in some embodiments, one end of the inner tube 2 is inserted into the connecting section 13 through the shaft hole 131, so that the inner end of the inner tube 2 can pass through the shaft hole 131 and extend into the first cavity 10, thereby enabling the second cavity 20 of the inner tube 2 to communicate with the first cavity 10 of the outer tube 1.

[0052] In some embodiments, the inner diameter of the shaft hole 131 is the same as the outer diameter of the inner tube 2, so that the connecting section 13 can be tightly fitted onto the outer wall of the inner tube 2. Therefore, the inner tube 2 can be tightly connected to the connecting section 13 through the shaft hole 131, which can effectively ensure the structural connection strength between the inner tube 2 and the connecting section 13.

[0053] In some embodiments, the outer wall of the inner tube 2 can be sealed to the shaft hole 131. The gap between the outer wall of the inner tube 2 and the inner wall of the shaft hole 131 can be reduced by tightly fitting the outer wall of the inner tube 2 into the inner wall of the shaft hole 131, and the inner tube 2 and shaft hole 131 can be sealed by end welding. Therefore, when the refrigerant flows from the second cavity 20 of the inner tube 2 to the first cavity 10 of the outer tube 1, it can prevent the refrigerant from flowing out from the gap between the outer wall of the inner tube 2 and the inner wall of the shaft hole 131.

[0054] It should be noted that in some other embodiments, the outer wall of the inner tube 2 is integrally formed with the inner connecting section 13.

[0055] Figure 6 yes Figure 3 The front view. Figure 7 yes Figure 6 A magnified structural diagram of region A in the middle.

[0056] Please see Figures 1 to 7 As shown, in some embodiments, in the outer tube 1, the diameter of the large-diameter section 11 is the first diameter, that is, the outer diameter of the large-diameter section 11 is the first diameter. The diameter of the connecting section 13 is the second diameter, that is, the outer diameter of the connecting section 13 is the second diameter. The outer diameter of the connecting section 13 is larger than the outer diameter of the large-diameter section 11, meaning the second diameter is larger than the first diameter.

[0057] Simultaneously, in the direction from the large-diameter section 11 towards the connecting section 13, the diameter of the transition section 12 gradually increases from a first diameter to a second diameter, so that one end of the transition section 12 smoothly or rounds into the end of the large-diameter section 11, and the other end of the transition section 12 smoothly or rounds into the end of the connecting section 13. Since the first lumen 10 passes through the transition section 12, the cross-sectional area of ​​the transition section 12 gradually changes. Specifically, in the direction from the large-diameter section 11 towards the connecting section 13, the cross-sectional area of ​​the transition section 12 gradually increases.

[0058] Therefore, when the refrigerant flows from the second cavity 20 of the inner pipe 2 into the first cavity 10 of the outer pipe 1, the refrigerant ejection noise and compressor noise can be transmitted to the connecting section 13 through vibration energy, and then from the connecting section 13 to the transition section 12 and the large-diameter section 11. When the vibration energy is transmitted along the transition section 12, the vibration energy is transmitted from the end with the larger cross-sectional area to the end with the smaller cross-sectional area. Due to the cumulative effect of vibration transmission, the vibration energy is partially or completely dissipated and absorbed, thereby effectively improving the overall vibration reduction effect of the inner pipe structure.

[0059] Please see Figure 7 As shown, in some embodiments, when the inner tube 2 is inserted into the outer tube 1, the inner tube 2 is located on the side of the transition section 12 away from the large-diameter section 11, and the end face of the inner tube 2 extending into the first cavity 10 is spaced apart from the transition section 12. Therefore, when the refrigerant flows into the first cavity 10 of the outer tube 1 through the second cavity 20 of the inner tube 2, the refrigerant ejection noise can be ejected at the transition section 12 and directly transferred into the first cavity 10. When the noise energy is transferred inside the transition section 12, since the cross-sectional area of ​​the transition section 12 gradually changes from large to small, the noise energy can be reflected on the inner wall of the transition section 12, thereby gradually dissipating and weakening the noise energy in the first cavity 10, thus improving the overall noise reduction effect of the inner tube structure.

[0060] In some embodiments, the outer peripheral wall of the gradient segment 12 is curved, and the height of the curved surface of the gradient segment 12 conforms to the acoustic black hole formula: y = 0.06x 3 Where y is the height of the curved surface of the transition section 12 protruding from the outer wall of the large-diameter section 11, and x is the distance between the curved surface of the transition section 12 and the end of the large-diameter section 11. Therefore, the diameter of the transition section 12 can gradually increase in the direction from the large-diameter section 11 toward the connecting section 13. At the same time, an acoustic black hole can be formed in the transition section 12, so that when the refrigerant flows into the first cavity 10 of the outer pipe 1 through the second cavity 20 of the inner pipe 2, the noise of the refrigerant ejection can be gradually dissipated and weakened in the transition section 12, thereby improving the overall noise reduction effect of the inner pipe structure.

[0061] Please see Figures 1 to 7 As shown, in some embodiments, a first vibration damping sleeve 3 is fitted onto the outer peripheral wall at the connection between the transition section 12 and the large-diameter section 11. The first vibration damping sleeve 3 is made of vibration damping material, such as putty or foam. This first vibration damping sleeve 3 is located at the connection between the transition section 12 and the large-diameter section 11, at the point where the cross-sectional curve of the inner wall of the pipe changes most sharply, and the amplitude of vibration energy is greatest at this location. Therefore, placing the first vibration damping sleeve 3 made of vibration damping material at this location can effectively dissipate vibration energy and attenuate the amplitude in a timely manner.

[0062] It should be noted that damping material rings can also be installed on the outer wall of other locations on the outer tube 1, which can also dissipate vibration energy and attenuate the amplitude. Of course, the damping effect at other locations is not as obvious as that at the first damping sleeve 3.

[0063] Please see Figure 7 As shown, in some embodiments, a first annular groove 14 is recessed on the outer peripheral wall at the connection between the transition section 12 and the large-diameter section 11 to cooperate with the first damping sleeve 3. Simultaneously, the first damping sleeve 3 is fitted onto the first annular groove 14. The design of the first annular groove 14 ensures that it is the position with the smallest cross-sectional wall thickness of the entire outer tube 1. Therefore, when the vibration energy reaches the first annular groove 14, the amplitude of the vibration energy is the largest, and the damping effect of the first damping sleeve 3 is most significant.

[0064] In some embodiments, the wall thickness of the first damping sleeve 3 is greater than the depth of the first annular groove 14. Therefore, the first damping sleeve 3 can partially protrude from the first annular groove 14, that is, partially protrude from the outer peripheral wall of the large-diameter section 11, so as to improve the damping effect of the first damping sleeve 3.

[0065] It should be noted that in some other embodiments, the wall thickness of the first damping sleeve 3 can also be equal to the depth of the first annular groove 14, so that one end of the first damping sleeve 3 can be flush with the outer peripheral wall of the large diameter section 11, thereby improving the appearance quality of the outer tube 1.

[0066] Figure 8 yes Figure 6 A magnified structural diagram of region B in the middle.

[0067] Please see Figures 6 to 8 As shown, in some embodiments, a curved section 101 is formed at the end of the connecting section 13 extending into the first cavity 10, and the curved section 101 is formed at the connection between the first cavity 10 and the shaft hole 131. Simultaneously, the curved section 101 and the transition section 12 are arranged at intervals, with the curved section 101 spaced apart on the side of the transition section 12 away from the large-diameter section 11. In the direction from the large-diameter section 11 towards the connecting section 13, the inner diameter of the curved section 101 gradually decreases. Therefore, at the curved section 101, the cross-sectional area of ​​the connecting section 13 gradually changes; specifically, in the direction from the large-diameter section 11 towards the connecting section 13, the cross-sectional area of ​​the connecting section 13 gradually increases. Therefore, the noise from refrigerant ejection and compressor can be transmitted to the connecting section 13 in the form of vibration energy. When the vibration energy is transmitted from the connecting section 13 to the transition section 12 and the large-diameter section 11, the vibration energy can be transmitted along the curved section 101. The vibration energy is transmitted from the end with the larger cross-sectional area to the end with the smaller cross-sectional area. Due to the cumulative effect of vibration transmission, the vibration energy will be partially or completely absorbed, thereby effectively improving the overall vibration reduction effect of the inner tube structure.

[0068] In some embodiments, when the inner tube 2 extends into the first cavity 10, the end of the inner tube 2 extending into the first cavity 10 passes through the curved section 101 and is located in the region between the curved section 101 and the transition section 12. Therefore, when the refrigerant flows into the first cavity 10 of the outer tube 1 through the second cavity 20 of the inner tube 2, the refrigerant ejection noise is transferred into the first cavity 10, and some of the noise energy can be transferred in the opposite direction to the curved section 101. As the noise energy is transferred into the curved section 101, since the cross-sectional area of ​​the curved section 101 gradually changes from small to large, the noise energy can be reflected on the inner wall of the curved section 101, thereby gradually dissipating and weakening the noise energy in the curved section 101, thus improving the overall noise reduction effect of the inner tube structure.

[0069] Please see Figure 8 As shown, in some embodiments, the first cavity 10 includes an axially extending circular tube segment 102 and a curved segment 101, the curved segment 101 being formed at the end of the circular tube segment 102 near the shaft hole 131. The peripheral wall of the curved segment 101 is curved, and the height of the curved segment 101 conforms to the acoustic black hole formula: y = 0.06x 3Where y is the height of the curved surface of the curved section 101 protruding from the circumference of the circular tube section 102, and x is the distance between the curved surface of the curved section 101 and the end of the circular tube section 102. Therefore, in the direction from the large-diameter section 11 towards the connecting section 13, the inner diameter of the curved section 101 can gradually decrease. At the same time, another acoustic black hole can be formed in the curved section 101, so that when the refrigerant flows into the first cavity 10 of the outer tube 1 through the second cavity 20 of the inner tube 2, the noise of the refrigerant ejection can be gradually dissipated and weakened in the curved section 101, thereby improving the overall noise reduction effect of the inner tube structure.

[0070] Please see Figures 3 to 8 As shown, in some embodiments, the microporous plate 5 is disposed within the first cavity 10. The microporous plate 5 is annular and is sealed onto the inner tube 2, so that the inner wall of the microporous plate 5 is in sealed contact with the outer wall of the inner tube 2. At the same time, the peripheral sidewall of the microporous plate 5 is in sealed contact with the peripheral wall of the first cavity 10. The microporous plate 5 is located on the side of the curved section 101 near the transition section 12, thereby forming a vibration damping cavity 100 between the microporous plate 5 and the inner wall of the curved section 101.

[0071] In some embodiments, the inner diameter of the microperforated plate 5 is equal to or slightly smaller than the outer diameter of the inner tube 2, thereby enabling the microperforated plate 5 to be tightly fitted onto the inner tube 2.

[0072] In some embodiments, the outer diameter of the microporous plate 5 is equal to or slightly larger than the inner diameter of the first cavity 10, thereby enabling the microporous plate 5 to be tightly fixed in the first cavity 10 and the peripheral sidewall of the microporous plate 5 to be sealed in contact with the peripheral wall of the first cavity 10.

[0073] Figure 9 yes Figure 3 A schematic diagram of the structure of the microporous plate 5.

[0074] Please see Figures 3 to 9 As shown, in some embodiments, the microporous plate 5 is densely covered with multiple axially penetrating perforations 51, each perforation 51 being connected to the vibration damping cavity 100, and all perforations 51 being connected to the first cavity 10 on the side of the microporous plate 5 away from the vibration damping cavity 100. Therefore, when the refrigerant flows into the first cavity 10 of the outer tube 1 through the second cavity 20 of the inner tube 2, some of the noise energy emitted by the refrigerant can pass through the perforations 51 of the microporous plate 5 and enter the vibration damping cavity 100. Since the cavity depth at each perforation 51 on the microporous plate 5 is different, the resonant frequency at each perforation 51 is different, gradually moving towards higher frequencies as the cavity depth decreases. This allows the vibration cavity to effectively reduce noise at various different frequencies, thereby improving the overall noise reduction effect of the inner tube structure.

[0075] In some embodiments, the micro-perforated plate 5 is disposed at the connection between the circular tube section 102 and the curved section 101, so that the vibration damping cavity 100 is formed in the curved section 101, thereby improving the vibration damping and noise reduction effect at the curved section 101.

[0076] Please see Figures 6 to 8 As shown, in some embodiments, a second vibration damping sleeve 4 is fitted onto the outer peripheral wall of the connecting section 13. The second vibration damping sleeve 4 is made of vibration damping material, such as putty or foam. The second vibration damping sleeve 4 is located on the outer periphery of the curved section 101, and the second vibration damping sleeve 4 at least covers the connection between the curved section 101 and the circular tube section 102. Therefore, the placement of the second vibration damping sleeve 4 made of vibration damping material at this location can effectively dissipate the vibration energy transmitted in the curved section 101 and reduce the amplitude.

[0077] In some embodiments, the second damping sleeve 4 covers the entire area of ​​the curved surface segment 101, thereby improving the damping effect at the curved surface segment 101. It should be noted that in some other embodiments, the second damping sleeve 4 may only cover a portion of the area of ​​the curved surface segment 101.

[0078] Please see Figure 8 As shown, in some embodiments, the outer peripheral wall of the connecting section 13 is recessed with a second annular groove 15 that mates with the second damping sleeve 4. Simultaneously, the second damping sleeve 4 is fitted into the second annular groove 15. The design of the second annular groove 15 ensures that it is the position with the smallest cross-sectional wall thickness in the entire connecting end. Therefore, when the vibration energy reaches the second annular groove 15 in the connecting section 13, the amplitude of the vibration energy is the largest, and the damping effect of the second damping sleeve 4 is more significant.

[0079] In some embodiments, the wall thickness of the second damping sleeve 4 is equal to the depth of the second annular groove 15, so that the outer peripheral wall of the second damping sleeve 4 can be flush with the outer peripheral wall of the connecting section 13, thereby improving the appearance quality of the outer tube 1.

[0080] It should be noted that in some other embodiments, the wall thickness of the second damping sleeve 4 may also be greater than the depth of the second annular groove 15, so that the second damping sleeve 4 can partially protrude from the second annular groove 15, that is, partially protrude from the outer peripheral wall of the connecting section 13, so as to improve the damping effect of the second damping sleeve 4.

[0081] Figure 10 yes Figure 3 A schematic diagram of the structure of the middle sound-absorbing panel 6. Figure 11 yes Figure 10 A schematic diagram of its decomposition.

[0082] Please see Figures 3 to 11As shown, in some embodiments, the sound-absorbing plate 6 is disposed inside the first cavity 10, and the sound-absorbing plate 6 and the inner tube 2 are arranged at intervals. Specifically, the end faces of the sound-absorbing plate 6 and the inner tube 2 extending into the first cavity 10 are arranged axially at intervals. At the same time, the center of the sound-absorbing plate 6 is provided with a through hole 60 that is directly opposite to the second cavity 20. Therefore, when the refrigerant flows into the first cavity 10 of the outer tube 1 through the second cavity 20 of the inner tube 2, part of the noise energy emitted by the refrigerant can be transmitted to the through hole 60 and pass through the through hole 60 to the inside of the first cavity 10; at the same time, part of the noise energy can be reflected at the sound-absorbing plate 6 and transmitted in the opposite direction to the curved section 101, which is conducive to the dissipation and reduction of noise energy in the damping cavity of the curved section 101, thereby improving the overall noise reduction effect of the inner tube structure.

[0083] In some embodiments, the sound-absorbing plate 6 is provided with a sound-absorbing channel 620, and the peripheral sidewall of the through hole 60 is provided with a sound inlet hole 621 that communicates with the sound-absorbing channel 620, that is, the sound inlet hole 621 communicates with the sound-absorbing channel 620 and the first cavity 10. The sidewall of the sound-absorbing plate 6 facing away from the inner tube 2 is provided with a sound outlet hole 631 that communicates with the sound-absorbing channel 620, that is, the sound outlet hole 631 also communicates with the sound-absorbing channel 620 and the first cavity 10. When the noise energy of the refrigerant ejection is transmitted to the through hole 60, part of the noise energy can pass through the through hole 60 and be transmitted into the first cavity 10. At the same time, part of the noise energy can enter the sound-absorbing channel 620 through the sound inlet hole 621 and be transmitted, so that the noise energy is dissipated and weakened, and returns to the first cavity 10 through the sound outlet hole 631. The noise energy returning to the first cavity 10 through the sound outlet 631 can interfere with the noise energy inside the first cavity 10. That is, the noise energy returning to the first cavity 10 through the sound outlet 631 can interfere with the noise energy transmitted into the first cavity 10 through the through hole 60, thereby further reducing the noise energy transmitted into the first cavity 10 and improving the overall noise reduction effect of the inner tube structure.

[0084] Please see Figures 10 to 11As shown, in some embodiments, two sound-absorbing channels 620 are provided, which are spaced apart and disposed inside the sound-absorbing plate 6. Two spaced-apart sound inlets 621 are provided on the peripheral sidewall of the through-hole 60, and each sound inlet 621 is connected to one of the two sound-absorbing channels 620. Simultaneously, two spaced-apart sound outlets 631 are provided on the sidewall of the sound-absorbing plate 6 facing away from the inner tube 2, and each sound outlet 631 is connected to one of the two sound-absorbing channels 620. Therefore, when the noise energy from the refrigerant ejection is transmitted to the through-hole 60, the noise energy can be transmitted through the two sound-absorbing channels 620 and then return to the first cavity 10, where it couples and interferes with the noise energy transmitted inside the first cavity 10. This further weakens the noise energy transmitted inside the first cavity 10, thereby improving the overall noise reduction effect of the inner tube structure.

[0085] It should be noted that in some other embodiments, multiple sound-absorbing channels 620 are provided, and these multiple sound-absorbing channels 620 are arranged inside the sound-absorbing plate 6 with intervals between them. Multiple sound inlets 621 are provided on the peripheral sidewall of the through-hole 60, and each of the multiple sound inlets 621 is connected to a corresponding sound-absorbing channel 620. Simultaneously, multiple sound outlets 631 are provided on the sidewall of the sound-absorbing plate 6 facing away from the inner tube 2, and each of the multiple sound outlets 631 is connected to a corresponding sound-absorbing channel 620. The number of sound-absorbing channels 620 can be adjusted as needed and is not limited here.

[0086] Please see Figures 3 to 11 As shown, in some embodiments, the sound-absorbing plate 6 is arranged perpendicular to the axial direction of the first cavity 10, and the outer peripheral wall of the sound-absorbing plate 6 is sealed to the inner peripheral wall of the first cavity 10, thereby fixing the sound-absorbing plate 6 inside the first cavity 10 and concentrating the noise energy of the refrigerant ejection to be transmitted to the through hole 60 or reflected through the sound-absorbing plate 6.

[0087] In some embodiments, the sound-absorbing plate 6 is disposed in the first cavity 10 at the connection between the transition section 12 and the connecting section 13. Therefore, the noise energy transmitted into the first cavity 10 through the through hole 60 can be reduced at the transition section 12, thereby improving the overall noise reduction effect of the inner tube structure.

[0088] Figure 12 yes Figure 10 Another breakdown diagram. Figure 13 yes Figure 12 Front view of the central channel plate 62.

[0089] Please see Figures 10 to 13As shown, in some embodiments, the sound-absorbing plate 6 includes a solid plate 61, a channel plate 62, and an outlet plate 63 that are sequentially attached to each other along the axial direction. That is, the solid plate 61 and the outlet plate 63 are respectively attached to the axial sides of the channel plate 62, with the solid plate 61 attached to the side of the channel plate 62 facing the inner tube 2, and the outlet plate 63 located on the side of the channel plate 62 facing away from the inner tube 2.

[0090] The solid plate 61 is a hollow circular plate structure, meaning it is annular, with the through hole 60 formed at the center of the annular shape. The contours of the channel plate 62 and the sound-absorbing plate 6 are consistent with those of the solid plate 61, both being annular structures. The through hole 60 sequentially passes through the solid plate 61, the channel plate 62, and the sound-absorbing plate 6.

[0091] The sound-absorbing channel 620 is formed on the channel plate 62, and multiple sound-absorbing channels 620 are arranged circumferentially around the through hole 60. When the outlet plate 63 and the solid plate 61 are respectively attached to the axial sides of the channel plate 62, the sound-absorbing channel 620 is formed between the outlet plate 63 and the solid plate 61.

[0092] The sound inlet 621 is located on the annular inner wall of the channel plate 62, that is, the sound inlet 621 is located on the inner wall of the channel plate 62 near the through hole 60. When the outlet plate 63 and the solid plate 61 are respectively attached to the axial sides of the channel plate 62, the sound inlet 621 is formed between the outlet plate 63 and the solid plate 61, and is formed on the peripheral side wall of the through hole 60.

[0093] The sound outlet 631 is located on the outlet plate 63 and extends through the outlet plate 63 axially. When the outlet plate 63 and the solid plate 61 are respectively attached to the axial sides of the channel plate 62, the sound outlet 631 can be connected to the end of the sound absorption channel 620 in the channel plate 62 that is away from the sound inlet 621.

[0094] In summary, when the refrigerant in the inner tube 2 flows through the outer tube 1, the noise energy emitted by the refrigerant is transmitted to the through hole 60. The noise energy can enter the sound absorption channel 620 through the sound inlet hole 621 on the side wall of the through hole 60, and then return to the first cavity 10 through the sound absorption channel 620 and the sound outlet hole 631. It interferes with the noise energy transmitted into the first cavity 10 through the through hole 60, thereby further reducing the noise energy transmitted into the first cavity 10 and improving the overall noise reduction effect of the inner tube structure.

[0095] Please see Figure 13 As shown, in some embodiments, a plurality of arc-shaped ribs 622 are formed on the channel plate 62, each arc-shaped rib 622 being arranged around its axis, that is, around the through hole 60. The plurality of arc-shaped ribs 622 are arranged radially outward at intervals, and the gaps between adjacent arc-shaped ribs 622 are connected end to end, thereby forming a sound-absorbing channel 620.

[0096] It should be noted that the number of arc-shaped ribs 622 can be adjusted as needed, and the more arc-shaped ribs 622 there are, the longer the sound absorption channel 620 will be, and the narrower the width of the sound absorption channel 620 will be.

[0097] In some embodiments, a plurality of arc-shaped ribs 622 are formed on the channel plate 62, and each group of arc-shaped ribs 622 includes a plurality of arc-shaped ribs 622 arranged radially outward at intervals. Each sound-absorbing channel 620 is formed by a group of arc-shaped ribs 622, that is, the plurality of arc-shaped ribs 622 in each group of arc-shaped ribs 622 can form a sound-absorbing channel 620. The plurality of groups of arc-shaped ribs 622 are arranged circumferentially, thereby enabling the plurality of sound-absorbing channels 620 formed to be arranged circumferentially.

[0098] Based on the internal tube structure of the above embodiments, this invention also provides a refrigeration device, which can be a common refrigeration device such as a refrigerator, freezer, or wine cabinet. The refrigeration device includes a cabinet and an internal tube structure disposed within the cabinet.

[0099] The outer shell of the refrigeration equipment is constructed as the casing. Multiple separate storage compartments can be set up inside the cabinet. Each of these compartments can serve as an independent low-temperature storage space, such as a freezer, refrigerator, fruit and vegetable compartment, or variable-temperature compartment, to meet different refrigeration needs for freezing, refrigeration, fruit and vegetable preservation, and variable-temperature storage, depending on the type of food. The multiple storage compartments can be arranged vertically or horizontally.

[0100] The refrigerator body has a door on the front side, which is designed to open and close the storage compartment. Specifically, the door is connected to the refrigerator body by a hinge, allowing the refrigerator door to rotate around the axis of the hinge, thereby opening and closing the refrigerator door and thus opening and closing the corresponding storage compartment.

[0101] The refrigerator is equipped with a refrigeration system to maintain a low temperature environment in each storage compartment. The refrigeration system includes a compressor, condenser, capillary tube, and evaporator. The compressor's discharge port is connected to the condenser's inlet, the condenser's outlet is connected to one end of the capillary tube, the other end of the capillary tube is connected to the evaporator's inlet, and the evaporator's outlet is connected to the compressor's return port. This forms a refrigeration circulation channel between the compressor, condenser, capillary tube, and evaporator, allowing the refrigerant to circulate within this channel, thus achieving the refrigeration function of the refrigerator.

[0102] The inner tube structure is located at the connection between the capillary tube and the evaporator. The outer tube 1 can be connected to the inlet end of the evaporator tube, or it can directly serve as the inlet end of the evaporator tube. The inner tube 2 can be connected to the outlet end of the capillary tube, or it can directly serve as the outlet end of the capillary tube. When the refrigerant flows from the capillary tube into the evaporator, it can flow from the second cavity inside the inner tube 2 into the first cavity inside the outer tube 1. The inner tube structure provides vibration damping and noise reduction, thereby improving the noise levels from refrigerant flow ejection and compressor operation, and enhancing the overall quality of the refrigeration equipment.

[0103] It should be noted that in other embodiments, the inner tube structure may also be located at the connection between the condenser and the capillary tube, or at the connection between other small-diameter tubes and large-diameter sleeves.

[0104] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An internal cannula structure, characterized in that, Includes outer and inner tubes; The outer tube includes a large-diameter section, a transition section, and a connecting section connected sequentially along the axial direction; the outer tube has a first cavity, which extends from the large-diameter section through the transition section and into the connecting section, and there is a gap between the first cavity and the axial end face of the connecting section. The inner tube is inserted axially into the connecting section from the axial end face and extends into the first cavity; the inner tube has a second cavity, which is connected to the first cavity; Wherein, the diameter of the large-diameter section is the first diameter, and the diameter of the connecting section is the second diameter, the second diameter being larger than the first diameter; In the direction from the large-diameter section toward the connecting section, the diameter of the gradient section gradually increases from the first diameter to the second diameter; The end of the first lumen that extends into the connecting section is formed with a curved section, and the curved sections are spaced apart on the side of the transition section away from the large-diameter section; The inner diameter of the curved section gradually decreases in the direction from the large-diameter section toward the connecting section.

2. The internal cannula structure as described in claim 1, characterized in that, The outer peripheral wall of the transition section is curved, and the height of the curved surface of the transition section conforms to the acoustic black hole formula: y = 0.06x 3 Where y is the height of the curved surface position of the gradient segment protruding from the outer wall of the large-diameter segment, and x is the distance between the curved surface position of the gradient segment and the large-diameter segment.

3. The internal cannula structure as described in claim 1, characterized in that, A first vibration damping sleeve is fitted on the outer peripheral wall at the connection between the gradient section and the large-diameter section.

4. The internal cannula structure as described in claim 3, characterized in that, A first annular groove is recessed on the outer peripheral wall at the connection between the gradient section and the large-diameter section to cooperate with the first vibration damping sleeve. The first damping sleeve is fitted onto the first annular groove, and the wall thickness of the first damping sleeve is greater than or equal to the depth of the first annular groove.

5. The internal cannula structure as described in claim 1, characterized in that, The inner tube is located on the side of the transition section away from the large-diameter section, and the end face of the inner tube that extends into the first lumen is arranged at an interval from the transition section.

6. The internal cannula structure as described in claim 1, characterized in that, The connecting section is provided with an axially extending shaft hole, which extends from the end face of the connecting section away from the axial direction toward the first tube cavity, and the shaft hole communicates with the first tube cavity. One end of the inner tube is inserted into the connecting section through the shaft hole and extends into the first tube cavity. The outer wall of the inner tube is sealed to the shaft hole.

7. The internal cannula structure as described in claim 1, characterized in that, The first cavity includes a circular tube segment extending axially, and a curved segment formed at the end of the circular tube segment. The peripheral wall of the curved segment is curved, and the height of the curved segment conforms to the acoustic black hole formula: y = 0.06x. 3 Where y is the height of the curved surface segment protruding from the circumference of the circular pipe segment, and x is the distance between the curved surface segment and the circular pipe segment.

8. The internal cannula structure as described in claim 1, characterized in that, The first tube cavity is provided with a microporous plate, which is sealed and fitted on the inner tube and located on the side of the curved section near the gradient section; The peripheral sidewall of the microporous plate is sealed to the peripheral wall of the first cavity, and a vibration damping cavity is formed between the microporous plate and the inner wall of the curved section. The microporous plate is densely covered with multiple through holes running along the axial direction, and the through holes are connected to the vibration damping cavity.

9. The internal cannula structure as described in claim 7, characterized in that, A second vibration damping sleeve is fitted on the outer peripheral wall of the connecting section. The second vibration damping sleeve is located on the outer periphery of the curved section and at least covers the connection between the curved section and the circular pipe section.

10. The internal cannula structure as described in claim 9, characterized in that, The outer peripheral wall of the connecting section is recessed with a second annular groove that mates with the second vibration damping sleeve, and the second vibration damping sleeve is fitted into the second annular groove.

11. The internal cannula structure as described in claim 1, characterized in that, The first cavity is provided with a sound-absorbing plate, and the sound-absorbing plate and the end face of the inner tube that extends into the first cavity are arranged axially at a distance from each other. The center of the sound-absorbing plate is provided with a through hole that is arranged directly opposite to the second cavity. The sound-absorbing plate has a sound-absorbing channel inside, and the peripheral sidewall of the through hole has a sound inlet hole that connects to the sound-absorbing channel. The sidewall of the sound-absorbing plate facing away from the inner tube has a sound outlet hole that connects to the sound-absorbing channel.

12. The internal cannula structure as described in claim 11, characterized in that, The sound-absorbing channel is provided in multiple ways, and the multiple sound-absorbing channels are arranged in the sound-absorbing panel at intervals and separated from each other; The peripheral sidewall of the through hole is provided with a plurality of spaced sound inlet holes, and the plurality of sound inlet holes are connected to the plurality of sound absorption channels one by one; The sound-absorbing plate has a plurality of spaced sound outlet holes on the side wall facing away from the inner tube, and the plurality of sound outlet holes are connected to the plurality of sound-absorbing channels one by one.

13. The internal cannula structure as described in claim 11, characterized in that, The sound-absorbing plate is arranged perpendicular to the axis of the first cavity, and the outer peripheral wall of the sound-absorbing plate is sealed to the inner peripheral wall of the first cavity.

14. The internal cannula structure as described in claim 11, characterized in that, The sound-absorbing plate is disposed in the first cavity at the connection between the gradient section and the connecting section.

15. The internal cannula structure as described in claim 11, characterized in that, The sound-absorbing panel includes an outlet panel, a channel panel, and a solid panel that are sequentially bonded together along the axial direction. The solid plate is located on the side of the channel plate facing the inner tube, and the outlet plate is located on the side of the channel plate facing away from the inner tube. The via hole sequentially penetrates the solid plate, the channel plate, and the sound-absorbing plate; The sound-absorbing channel is formed on the channel plate, the sound inlet hole is located on the inner wall of the channel plate near the through hole, and the sound outlet hole is located on the outlet plate.

16. The internal cannula structure as described in claim 15, characterized in that, The channel plate is provided with arc-shaped ribs arranged around its axis, and multiple arc-shaped ribs are provided, which are arranged in a radially outward and spaced apart. The gaps between adjacent arc-shaped ribs are connected sequentially to form the sound-absorbing channel.

17. A refrigeration device, characterized in that, The refrigeration equipment includes an internal tube structure as described in any one of claims 1-16.

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