Noise reduction connecting pipeline for heat exchanger, heat exchanger and refrigeration equipment
By setting multiple gradually narrowing orifices with transitional protrusions in the noise-reducing connection pipes of the evaporator, the problem of high noise during the refrigerant flow process is solved, achieving gradual phase change of the refrigerant, reducing noise, and improving the user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2026-03-06
AI Technical Summary
Existing evaporators generate significant noise during refrigerant flow due to the instantaneous change in pipe cross-section, resulting in a poor user experience.
Design a noise-reducing connection pipe for heat exchangers. By setting multiple gradually narrowing orifices with transitional protrusions inside the pipe, the refrigerant undergoes a phase change gradually, reducing the degree of instantaneous phase change and lowering noise.
Through the design of multiple tapering orifices, the refrigerant undergoes a phase change gradually, significantly reducing noise and improving the user experience.
Smart Images
Figure CN223976536U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of household appliance technology, such as a noise-reducing connection pipe for a heat exchanger, a heat exchanger, and a refrigeration device. Background Technology
[0002] With societal development, household refrigeration appliances such as refrigerators have become widely used in people's daily lives. They utilize the property of thermal expansion and contraction of air to ensure the temperature inside the refrigerator is lower than the ambient temperature outside, thus preserving the items stored inside. The refrigerator's refrigeration system includes an evaporator, which is used to cool the freezer or refrigerator compartments; therefore, the evaporator is a crucial component of the refrigerator. However, during use, the refrigerant generates noise due to phase change as it flows into the evaporator, leading to a poor user experience.
[0003] In related technologies, a tapered tube is usually installed at the inlet of the evaporator to reduce the noise generated during the refrigerant phase change.
[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:
[0005] In existing evaporators with converging tubes, the refrigerant still undergoes a phase change instantaneously as it flows through the tubes into the evaporator due to the increased cross-sectional area. This drastic pressure fluctuation and refrigerant phase change still generate significant noise, resulting in a poor user experience.
[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.
[0008] This disclosure provides a noise-reducing connecting pipe for a heat exchanger, a heat exchanger, and a refrigeration device. As the refrigerant flows into the heat exchanger through the noise-reducing connecting pipe, it sequentially passes through multiple tapered orifices with transitional protrusions before flowing through the heat exchanger. This allows the refrigerant to undergo a gradual phase change through multiple tapered orifices, reducing the instantaneous phase change and thus lowering noise levels, resulting in a better user experience.
[0009] This disclosure provides a noise reduction connection pipe for a heat exchanger, comprising: a pipe body and multiple transition protrusions. The pipe body is provided with a hollow flow channel; the multiple transition protrusions are disposed within the flow channel along the length direction of the pipe body, and the multiple transition protrusions are spaced apart; wherein, a tapered opening is provided in the middle of the transition protrusion, the size of the tapered opening is smaller than the size of the flow channel, and the tapered opening is coaxial with the flow channel.
[0010] In some embodiments, the tube body includes a liquid inlet; wherein, a first guide surface is provided on the side of the transition protrusion facing the liquid inlet, and the first guide surface is inclined from the tube wall of the tube body toward the tapering opening along a preset direction.
[0011] In some embodiments, the angle between the first guide surface and the pipe wall is a first included angle a1; wherein the first included angle a1 is greater than 0° and less than or equal to 90°.
[0012] In some embodiments, the tube body further includes a liquid outlet, and a plurality of transition protrusions are disposed between the liquid inlet and the liquid outlet; wherein, a second guide surface is provided on the side of the transition protrusion facing the liquid outlet, and the second guide surface is inclined from the tapering opening toward the tube wall of the tube body along a preset direction.
[0013] In some embodiments, the angle between the second guide surface and the pipe wall is a second included angle a2; wherein the second included angle a2 is greater than 0° and less than or equal to 90°.
[0014] In some embodiments, the noise reduction connection pipe further includes a sound-absorbing layer. The sound-absorbing layer is attached to the outside of the pipe body; wherein the area of the sound-absorbing layer attached to the pipe body is greater than or equal to 1 / 2 of the surface area of the pipe body.
[0015] In some embodiments, the silencing layer includes a plurality of sub-silencing portions, which are configured as separate structures and are spaced apart and attached to the outside of the tube body.
[0016] In some embodiments, the tube body is provided with an inwardly recessed groove to form a transitional protrusion within the tube body.
[0017] This disclosure also provides a heat exchanger comprising: a heat exchanger body, the aforementioned noise-reducing connecting pipe and capillary tube. The heat exchanger body is provided with heat exchanger piping; one end of the noise-reducing connecting pipe is connected to the heat exchanger piping; the capillary tube is connected to the other end of the noise-reducing connecting pipe relative to the heat exchanger piping; wherein the flow direction of the refrigerant within the heat exchanger is defined as flowing from the capillary tube to the heat exchanger body.
[0018] This disclosure also provides a refrigeration device including a refrigeration system. The refrigeration system includes the heat exchanger described above; wherein the heat exchanger is an evaporator.
[0019] This disclosure provides a noise-reducing connection pipe for a heat exchanger, a heat exchanger, and a refrigeration device, which can achieve the following technical effects:
[0020] This disclosure provides a noise-reducing connection pipe for a heat exchanger, comprising: a pipe body and multiple transition protrusions. The pipe body has a hollow flow channel; multiple transition protrusions are disposed within the flow channel along the length of the pipe body, and are spaced apart; wherein, a tapering orifice is provided in the middle of each transition protrusion, the size of which is smaller than the size of the flow channel, and the tapering orifice is coaxially arranged with the flow channel. The noise-reducing connection pipe is connected to the heat exchanger's piping, and refrigerant flows sequentially through the noise-reducing connection pipe and the heat exchanger. Thus, before flowing into the evaporator, the refrigerant first flows through the noise-reducing connection pipe and sequentially through the multiple tapering orifices, where it undergoes a gradual phase change. This arrangement limits the phase change process of the refrigerant in the heat exchanger through several tapering orifices, gradually releasing the phase change process to reduce instantaneous phase change, thereby reducing noise and improving the user experience.
[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description
[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:
[0023] Figure 1 This is a schematic diagram of the structure of a heat exchanger provided in an embodiment of this disclosure;
[0024] Figure 2 This is a refrigerant flow diagram of a heat exchanger provided in an embodiment of this disclosure;
[0025] Figure 3 This is a schematic diagram of a noise reduction connection pipeline provided in an embodiment of this disclosure;
[0026] Figure 4 yes Figure 3 A magnified view of the local structure;
[0027] Figure 5 This is a schematic diagram of another noise reduction connection pipeline provided in an embodiment of this disclosure;
[0028] Figure 6 yes Figure 5 A magnified view of the local structure.
[0029] Figure label:
[0030] 10: Noise-reducing connecting pipe; 11: Pipe body; 111: Pipe wall; 112: Liquid inlet; 113: Liquid outlet; 12: Flow channel; 13: Transition protrusion; 131: First guide surface; 132: Second guide surface; 14: Gradual narrowing opening;
[0031] 20: Heat exchanger piping; 30: Capillary tube; 40: Sound-absorbing layer; 41: Sub-sound-absorbing section. Detailed Implementation
[0032] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.
[0033] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.
[0034] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.
[0035] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.
[0036] Unless otherwise stated, the term "multiple" means two or more.
[0037] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.
[0038] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.
[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.
[0040] like Figures 1 to 4 As shown in the embodiment of this disclosure, a noise-reducing connecting pipe 10 for a heat exchanger, a heat exchanger, and a refrigeration device are provided. During the process of refrigerant flowing into the heat exchanger through the noise-reducing connecting pipe 10, the refrigerant sequentially flows through the tapered orifices 14 of multiple transition protrusions 13 before flowing through the heat exchanger. In this way, the refrigerant undergoes a gradual phase change through the multiple tapered orifices 14, reducing the instantaneous phase change degree of the refrigerant and thus achieving a noise reduction effect, resulting in a better user experience.
[0041] like Figures 1 to 4 As shown, this embodiment of the present disclosure provides a noise reduction connection pipe 10 for a heat exchanger, including: a pipe body 11 and a plurality of transition protrusions 13. The pipe body 11 is provided with a hollow flow channel 12; the plurality of transition protrusions 13 are disposed within the flow channel 12 of the pipe body 11 along the length direction of the pipe body 11, and the plurality of transition protrusions 13 are spaced apart; wherein, a tapered opening 14 is provided in the middle of the transition protrusion 13, the size of the tapered opening 14 is smaller than the size of the flow channel 12, and the tapered opening 14 is coaxially disposed with the flow channel 12.
[0042] Specifically, the flow channel 12 of the pipe body 11 of the noise reduction connecting pipe 10 is connected to the pipe of the heat exchanger, and the refrigerant can flow into the heat exchanger through the noise reduction connecting pipe 10. The transition protrusion 13 is provided in the flow channel 12 of the pipe body 11, and a through hole is provided in the middle of the transition protrusion 13 to form a tapered opening 14. The refrigerant can flow from one side of the transition protrusion 13 through the tapered opening 14 to the other side of the transition protrusion 13.
[0043] When the heat exchanger is operating, the refrigerant first flows into the flow channel 12 of the tube body 11 and then sequentially passes through the tapered openings 14 of multiple transition protrusions 13. This creates multiple stepped structures within the flow channel 12 through the transition protrusions 13, allowing the refrigerant to undergo a stepped pressure reduction within the flow channel 12, thus reducing the refrigerant's ejection capacity. This arrangement allows the refrigerant to undergo a gradual phase change through the multiple tapered openings 14, reducing the instantaneous degree of phase change and thereby reducing noise and improving the user experience. Simultaneously, the tapered openings 14 of the multiple transition protrusions 13 are all coaxially arranged with the flow channel 12, meaning the axis of the tapered opening 14 coincides with the axis of the flow channel 12. This prevents the transition protrusions 13 from interfering with the refrigerant flow within the flow channel 12, thereby avoiding any impact on the heat exchange efficiency of the evaporator.
[0044] In practical applications, the number and spacing of the transition protrusions 13 can be set according to the user's actual needs. For example, if the length of the pipe body 11 is long or the user has a greater need for noise reduction, the number of transition protrusions 13 can be increased. At the same time, the size of the tapered opening 14 can also be set according to the user's actual needs. For example, the user can set the diameter of the tapered opening 14 according to the diameter of the pipe body 11 and the flow rate of the refrigerant.
[0045] like Figure 4 As shown, in some embodiments, the tube body 11 includes an inlet 112; wherein, a first guide surface 131 is provided on the side of the transition protrusion 13 facing the inlet 112, and the first guide surface 131 is inclined from the tube wall 111 of the tube body 11 toward the tapered opening 14 in a preset direction.
[0046] Specifically, the liquid inlet 112 is located at the end of the tube body 11 facing away from the heat exchanger, and the refrigerant can flow into the flow channel 12 of the tube body 11 through the liquid inlet 112, so that the refrigerant flows into the heat exchanger through the flow channel 12. A first guide surface 131 is provided on the side of the transition protrusion 13 facing the liquid inlet 112, and the first guide surface 131 is inclined from the inside of the tube body 11 towards the tapered opening 14 along the flow direction of the refrigerant. In this way, after the refrigerant flows into the flow channel 12, it can flow along the first guide surface 131 to the tapered opening 14. This arrangement can avoid the refrigerant directly impacting the transition protrusion 13 and generating eddies, further reducing the influence of the transition protrusion 13 on the refrigerant flow.
[0047] like Figure 4 As shown, in some embodiments, the angle between the first guide surface 131 and the pipe wall 111 is a first included angle a1; wherein, the first included angle a1 is greater than 0° and less than or equal to 90°.
[0048] Specifically, the angle between the first guide surface 131 and the pipe wall 111 is a first included angle α1, which is greater than 0° and less than or equal to 90°. For example, the first included angle α1 can be 1°, 20°, 40°, 60°, or 90°. Users can set the first included angle α1 according to factors such as the pipe diameter of the pipe body 11 or the flow rate of the refrigerant, to avoid the first included angle α1 being too large, resulting in poor flow guiding effect of the first guide surface 131, or the first included angle α1 being too small, resulting in excessive size of the first guide surface 131.
[0049] like Figures 3 to 6 As shown, optionally, the first guide surface 131 can be a plane or an arc surface. When the first guide surface 131 is an arc surface, the tangent at the connection between the first guide surface 131 and the pipe wall 111 is the first reference line, and the first included angle a1 refers to the angle between the first reference line and the pipe wall 111.
[0050] like Figure 4 As shown, in some embodiments, the tube body 11 further includes a liquid outlet 113, and a plurality of transition protrusions 13 are disposed between the liquid inlet 112 and the liquid outlet 113; wherein, a second guide surface 132 is also provided on the side of the transition protrusion 13 facing the liquid outlet 113, and the second guide surface 132 is inclined from the tapered opening 14 to the tube wall 111 of the tube body 11 along a preset direction.
[0051] Specifically, the outlet 113 is connected to the heat exchanger piping. Multiple transition protrusions 13 are sequentially arranged between the inlet 112 and the outlet 113 along the refrigerant flow direction. The refrigerant flow direction within the flow channel 12 is limited to from the inlet 112 to the outlet 113, allowing the refrigerant to flow sequentially through the multiple transition protrusions 13. A second guide surface 132 is also provided on the side of the transition protrusion 13 facing the outlet 113, and the second guide surface 132 is inclined from the constriction port 14 towards the pipe wall 111 of the pipe body 11 along the refrigerant flow direction. Thus, after the refrigerant flows through the constriction port 14, the second guide surface 132 gradually expands to gradually release the phase change process of the refrigerant, further reducing the instantaneous phase change of the refrigerant and thus further reducing noise.
[0052] like Figure 4 As shown, in some embodiments, the angle between the second guide surface 132 and the pipe wall 111 is a second included angle a2; wherein the second included angle a2 is greater than 0° and less than or equal to 90°.
[0053] Specifically, the angle between the second guide surface 132 and the pipe wall 111 is a second included angle α2, which is greater than 0° and less than or equal to 90°. For example, the second included angle α2 can be 1°, 20°, 40°, 60°, or 90°. Users can set the second included angle α2 according to factors such as the pipe diameter of the pipe body 11 or the flow rate of the refrigerant to avoid the second included angle α2 being too large, which would increase the instantaneous phase change of the refrigerant, or the second included angle α2 being too small, which would result in the second guide surface 132 being too large.
[0054] like Figures 3 to 6 As shown, optionally, the second guide surface 132 can be a plane or an arc surface. When the second guide surface 132 is an arc surface, the tangent at the connection between the second guide surface 132 and the pipe wall 111 is the second reference line, and the second included angle a2 refers to the angle between the second reference line and the pipe wall 111.
[0055] like Figures 1 to 3 As shown, in some embodiments, the number of transition protrusions 13 is greater than or equal to one.
[0056] Specifically, the number of transition protrusions 13 can be set according to the user's actual needs. For example, the number of transition protrusions 13 can be 1, 4, 6, 8, or 10. This setting makes it easier for users to adapt to different heat exchangers.
[0057] like Figure 1 As shown, in some embodiments, the noise reduction connection pipe 10 further includes a sound-absorbing layer 40. The sound-absorbing layer 40 is attached to the outside of the pipe body 11; wherein the area of the sound-absorbing layer 40 attached to the pipe body 11 is greater than or equal to 1 / 2 of the surface area of the pipe body 11.
[0058] Specifically, the sound-absorbing layer 40 is made of a flexible material such as sound-absorbing cotton or sound-insulating felt. When the sound-absorbing layer is configured as an integral structure, the user can directly wrap the sound-absorbing layer 40 around the outside of the pipe body 11 to further reduce the noise generated by the refrigerant. The area of the sound-absorbing layer 40 covering the pipe body 11 is greater than or equal to half the surface area of the pipe body 11. For example, the area of the sound-absorbing layer 40 covering the pipe body 11 is equal to half the surface area of the pipe body 11, or the area of the sound-absorbing layer 40 covering the pipe body 11 is equal to the surface area of the pipe body 11, meaning the sound-absorbing layer 40 can completely cover the outside of the pipe body 11.
[0059] like Figure 5 As shown, in some embodiments, the silencing layer 40 includes a plurality of sub-silencing parts 41, which are configured as separate structures and are spaced apart and attached to the outside of the tube body 11.
[0060] Specifically, the sub-silencing part 41 can be either a ring structure or a block structure. When the sub-silencing part 41 is configured as a ring structure, multiple sub-silencing parts 41 are spaced apart and disposed on the outer side of the pipe body 11 along its length. When the sub-silencing part 41 is configured as a block structure, multiple sub-silencing parts 41 can be spaced apart and attached to the outer side of the pipe body 11. This arrangement allows the user to attach multiple sub-silencing parts 41 to different locations on the pipe body 11 according to actual needs.
[0061] like Figure 5 and Figure 6 As shown, in some embodiments, the tube body is provided with an inwardly recessed groove to form a transitional protrusion within the tube body.
[0062] Specifically, a protruding structure can be directly provided on the inner wall 111 of the tube body 11 to form a transition protrusion 13; alternatively, the tube body 11 can be stamped to make it concave inward and form a protrusion inside the tube body 11 to constitute the transition protrusion 13. This arrangement makes it easier to process the transition protrusion 13 inside the tube body 11.
[0063] like Figures 1 to 4 As shown in the figure, this disclosure also provides a heat exchanger including: a heat exchanger body, the aforementioned noise-reducing connecting pipe 10 for the heat exchanger, and a capillary tube 30. The heat exchanger body is provided with the heat exchanger pipe 20; one end of the noise-reducing connecting pipe 10 is connected to the heat exchanger pipe 20; the capillary tube 30 is connected to the other end of the noise-reducing connecting pipe 10 relative to the heat exchanger pipe 20; wherein, the flow direction of the refrigerant in the heat exchanger is limited to flowing from the capillary tube 30 to the heat exchanger body.
[0064] Specifically, the capillary tube 30 is connected to the inlet 112 of the noise-reducing connecting pipe 10, and the heat exchanger pipe 20 is connected to the outlet 113 of the noise-reducing connecting pipe 10. The flow direction of the refrigerant in the heat exchanger is limited to flowing from the capillary tube 30 to the heat exchanger pipe 20. Using the heat exchanger with the noise-reducing connecting pipe 10 provided in this application, the refrigerant in the capillary tube 30 will first flow through the noise-reducing connecting pipe 10 and then flow into the heat exchanger pipe 20. This arrangement allows the refrigerant to undergo a gradual phase change, reducing the instantaneous phase change and thus achieving noise reduction, resulting in a better user experience.
[0065] like Figures 1 to 4 As shown in the embodiments of this disclosure, a refrigeration device is also provided, comprising: a refrigeration system. The refrigeration system includes the heat exchanger described above; wherein the heat exchanger is an evaporator.
[0066] Specifically, the refrigeration equipment is a refrigerator, and the aforementioned heat exchanger is an evaporator. Refrigeration equipment using the heat exchanger provided in this application can reduce the noise generated when refrigerant flows into the evaporator, thus improving the user experience.
[0067] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A noise reduction connection line for a heat exchanger, characterized by, The noise reduction connecting pipeline comprises: a pipe body provided with a hollow flow channel; and a plurality of transition protrusions arranged in the flow channel of the pipe body along the length direction of the pipe body, and the plurality of transition protrusions are arranged at intervals. The middle part of the transition protrusion is provided with a tapered opening, the size of the tapered opening is smaller than the size of the flow channel, and the tapered opening is coaxially arranged with the flow channel.
2. The noise reduction connecting pipeline according to claim 1, wherein the pipe body comprises a liquid inlet; wherein the first guide surface is arranged on one side of the transition protrusion facing the liquid inlet, and the first guide surface is arranged obliquely from the pipe wall of the pipe body to the tapered opening along a predetermined direction.
3. The noise reduction connecting pipeline according to claim 2, wherein the included angle between the first guide surface and the pipe wall is a first included angle a1; wherein the first included angle a1 is greater than 0° and less than or equal to 90°.
4. The noise reduction connecting pipeline according to claim 2, wherein the pipe body further comprises a liquid outlet, and the plurality of transition protrusions are arranged between the liquid inlet and the liquid outlet; wherein the second guide surface is further arranged on one side of the transition protrusion facing the liquid outlet, and the second guide surface is arranged obliquely from the tapered opening to the pipe wall of the pipe body along a predetermined direction.
5. The noise reduction connecting pipeline according to claim 4, wherein the included angle between the second guide surface and the pipe wall is a second included angle a2; wherein the second included angle a2 is greater than 0° and less than or equal to 90°.
6. The noise reducing connection line according to any one of claims 1 to 5, characterized in that Further comprising: a sound-absorbing layer attached to the outer side of the pipe body; wherein the area of the sound-absorbing layer attached to the pipe body is greater than or equal to 1 / 2 of the surface area of the pipe body.
7. The noise reduction connecting pipeline according to claim 6, wherein the sound-absorbing layer comprises a plurality of sub-sound-absorbing parts, the plurality of sub-sound-absorbing parts are configured as a split structure, and the plurality of sub-sound-absorbing parts are arranged at intervals on the outer side of the pipe body.
8. The noise reduction connecting pipeline according to any one of claims 1 to 5, wherein the pipe body is provided with an inwardly recessed groove to form the transition protrusion in the pipe body.
9. A heat exchanger, characterized by The noise reduction connecting pipeline for the heat exchanger comprises: a heat exchanger body provided with a heat exchanger pipeline; the noise reduction connecting pipeline according to any one of claims 1 to 8, one end of the noise reduction connecting pipeline being in communication with the heat exchanger pipeline; and a capillary tube in communication with the other end of the noise reduction connecting pipeline relative to the heat exchanger pipeline; wherein the flow direction of the refrigerant in the heat exchanger is defined as flowing from the capillary tube to the heat exchanger body.
10. A refrigeration appliance characterized in that, The refrigeration system comprises: a heat exchanger according to claim 9; wherein the heat exchanger is an evaporator.