Internal exhaust pipe, fluid machine and heat exchange device

Abstract

The utility model provides a kind of inner exhaust pipe, fluid machinery and heat exchange equipment.The inner exhaust pipe includes intake pipe section, main pipe body and exhaust pipe section, main pipe body includes sequentially connected first elbow pipe section, first transition pipe section, second elbow pipe section, third elbow pipe section and second transition pipe section, first elbow pipe section is connected with intake pipe section, second transition pipe section is connected with exhaust pipe section, wherein, intake pipe section is 7 character shape, and exhaust pipe section is S shape.The utility model solves the problem of poor damping performance of fluid machinery in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and more specifically, to an internal exhaust pipe, fluid machinery, and heat exchange equipment. Background Technology

[0002] Currently, heat exchange equipment such as refrigerators are not only widely used in home settings, but are also gradually being applied in vehicle settings to meet people's travel needs.

[0003] Compared to the piston compressors used in ordinary household refrigerators, the piston compressors used in vehicle refrigerators face higher requirements for reliability and noise and vibration control due to the limited installation space, harsh working environment, and closer proximity to the user. During the reciprocating motion of a piston compressor, the internal mechanism generates significant vibrations, which are primarily transmitted to the external structure through the connection between the internal exhaust pipe and the compressor housing. However, in a vehicle environment, due to the compact overall structure, the internal exhaust pipe cannot utilize the traditional "long pipe for frequency reduction" design method used in household compressors. This often results in poor vibration damping performance, affecting compressor reliability and user experience.

[0004] As can be seen from the above, the existing technology has the problem of poor vibration reduction performance in fluid machinery. Utility Model Content

[0005] The main purpose of this utility model is to provide an internal exhaust pipe, fluid machinery and heat exchange equipment to solve the problem of high structural complexity of heat exchange equipment in the prior art.

[0006] To achieve the above objectives, according to one aspect of the present invention, an internal exhaust pipe is provided, comprising an intake pipe section, a main pipe body, and an exhaust pipe section. The main pipe body comprises a first bend pipe section, a first transition pipe section, a second bend pipe section, a third bend pipe section, and a second transition pipe section connected in sequence. The first bend pipe section is connected to the intake pipe section, and the second transition pipe section is connected to the exhaust pipe section. The intake pipe section is shaped like a "7", and the exhaust pipe section is shaped like an "S".

[0007] Furthermore, the bend in the intake pipe section has a first arc segment, and the radius R1 of the first arc segment satisfies: 5mm≤R1≤8mm.

[0008] Furthermore, the first bend segment includes a second arc segment and straight segments located on both sides of the second arc segment, wherein the radius R2 of the second arc segment 1 satisfies: 5mm≤R2≤10mm; and / or the included angle β between the two straight segments of the first bend segment satisfies: 0°≤β≤30°.

[0009] Furthermore, both the first transition pipe section and the third bend pipe section are circular arc sections, wherein the radius R3 of the first transition pipe section satisfies: 10mm≤R3≤20mm; and / or the radius R5 of the third bend pipe section satisfies: 5mm≤R5≤10mm.

[0010] Furthermore, the second bend has a third arc segment at least at one end near the third bend, and the radius R4 of the third arc segment satisfies: 5mm≤R4≤10mm.

[0011] Furthermore, the second transition pipe section has a fourth arc segment at the end near the exhaust pipe section, and the radius R6 of the fourth arc segment satisfies: 6mm≤R6≤12mm.

[0012] Furthermore, the end of the exhaust pipe section away from the second transition pipe section has a fifth arc segment, and the radius R7 of the fifth arc segment satisfies: 5mm≤R7≤10mm.

[0013] Furthermore, the angle α between the plane of the intake pipe section and the plane of the first bend pipe section satisfies: 0°≤α≤35°; and / or the angle γ between the plane of the first transition pipe section and the plane of the first bend pipe section satisfies: 30°≤γ≤60°; and / or the angle θ between the plane of the third bend pipe section and the plane of the second bend pipe section satisfies: 0°≤θ≤45°; and / or the angle ψ between the plane of the second transition pipe section and the plane of the first bend pipe section satisfies: 30°≤ψ≤80°; and / or the angle λ between the plane of the exhaust pipe section and the plane of the first bend pipe section satisfies: 0°≤λ≤15°.

[0014] Furthermore, the internal exhaust pipe is integrally formed or the main pipe body is integrally formed.

[0015] Furthermore, the inherent frequency of the internal exhaust pipe is 90Hz to 180Hz; and / or the internal exhaust pipe is a Bundy pipe, copper pipe, or plastic pipe.

[0016] According to another aspect of the present invention, a fluid machine is also provided, including a cylinder seat, a housing, and the aforementioned internal exhaust pipe. The cylinder seat has a silencing cavity, the housing is provided with an exhaust pipe, and the internal exhaust pipe is fixedly connected to the silencing cavity and the exhaust pipe, respectively.

[0017] Furthermore, the fluid machinery also includes a compression spring structure disposed between the cylinder seat and the housing. The compression spring structure includes a compression spring body with an axial stiffness of 0.6 N / mm to 2 N / mm.

[0018] According to another aspect of the present invention, a heat exchange device is also provided, including the above-described fluid machinery.

[0019] Furthermore, the heat exchange equipment is a vehicle-mounted air conditioner.

[0020] The technical solution of this utility model includes an internal exhaust pipe comprising an intake pipe section, a main pipe body, and an exhaust pipe section. The main pipe body comprises a first bend pipe section, a first transition pipe section, a second bend pipe section, a third bend pipe section, and a second transition pipe section connected in sequence. The first bend pipe section is connected to the intake pipe section, and the second transition pipe section is connected to the exhaust pipe section. The intake pipe section is shaped like a figure 7, and the exhaust pipe section is S-shaped. By rationally setting the shape of each pipe section of the internal exhaust pipe, it is spatially adapted to the shape and direction of the fluid machinery, thereby increasing the natural frequency of the internal exhaust pipe, suppressing the resonance tendency of the vibration propagation path, and helping to reduce the impact of airflow and reduce the intensity of the vibration source. This greatly improves the vibration reduction performance of the fluid machinery with the internal exhaust pipe, improves the vibration transmission between the fluid machinery's core and shell, and the refrigeration system, enhances the reliability of the fluid machinery, and improves the user experience. This solves the problem of poor vibration reduction performance of fluid machinery in the prior art. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 A perspective view of the internal exhaust pipe in a specific embodiment of the present invention is shown;

[0023] Figure 2 A perspective view of a fluid machine according to a specific embodiment of the present invention is shown;

[0024] Figure 3 A top view of a fluid machine according to a specific embodiment of the present invention is shown;

[0025] Figure 4 A side view of a fluid machine according to a specific embodiment of the present invention is shown;

[0026] Figure 5 A cross-sectional view of a compression spring structure in a specific embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. Cylinder seat; 11. Muffler cavity; 12. Mounting foot; 20. Internal exhaust pipe; 21. Intake pipe section; 211. First arc section; 22. Main pipe body; 221. First bend section; 2211. Second arc section; 222. First transition pipe section; 223. Second bend section; 2231. Third arc section; 224. Third bend section; 2241. Fourth arc section; 225. Second transition pipe section; 23. Exhaust pipe section; 231. Fifth arc section; 30. Housing; 31. Exhaust pipe; 32. Engine foot; 40. Compression spring structure; 41. Compression spring body; 42. Compression spring support; 43. Compression spring support sleeve; 44. Stator screw; 50. Motor stator. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] To address the problem of poor vibration reduction performance in existing fluid machinery, this invention provides an internal exhaust pipe, a fluid machine, and a heat exchange device. The heat exchange device includes the fluid machine. The fluid machine includes the internal exhaust pipe.

[0031] In this embodiment, the fluid machinery is a compressor. Furthermore, the heat exchange device is a vehicle-mounted refrigerator.

[0032] like Figure 1 , Figures 2 to 4 As shown, the internal exhaust pipe includes an intake pipe section 21, a main pipe body 22, and an exhaust pipe section 23. The main pipe body 22 includes a first bend pipe section 221, a first transition pipe section 222, a second bend pipe section 223, a third bend pipe section 224, and a second transition pipe section 225 connected in sequence. The first bend pipe section 221 is connected to the intake pipe section 21, and the second transition pipe section 225 is connected to the exhaust pipe section 23.

[0033] The technical solution of this application, by reasonably setting the shape of each section of the internal exhaust pipe, spatially adapts the shape and direction to the fluid machinery, thereby increasing the natural frequency of the internal exhaust pipe, suppressing the resonance tendency of the vibration propagation path, and helping to reduce airflow impact and reduce the intensity of the vibration source. This greatly improves the vibration reduction performance of the fluid machinery with the internal exhaust pipe, improves the vibration transmission between the fluid machinery's core and shell, and the refrigeration system, enhances the reliability of the fluid machinery, and thus improves the user experience.

[0034] In this embodiment, as Figure 4 As shown, the bend in the intake pipe section 21 has a first arc segment 211, the radius R1 of which satisfies: 5mm ≤ R1 ≤ 8mm. Specifically, the intake pipe section 21 in this embodiment also includes a first segment and a second segment. The first segment is located away from the first bend pipe section 221 and is fixedly connected to the silencing cavity 11 of the fluid machinery. The second segment is located close to the first bend pipe section 221 and is connected to it. The first segment is a short segment, and the second segment is a long segment. The first arc segment 211 connects the first segment and the second segment, thus forming a figure-7 shape. It can be understood that the intake pipe section 21 in this embodiment is not a completely straight figure-7 shape, but rather has an arc transition at the bend, forming a more rounded figure-7 shape.

[0035] Furthermore, such as Figure 3 As shown, the angle α between the plane containing the intake pipe section 21 and the plane containing the first bend pipe section 221 satisfies: 0° ≤ α ≤ 35°. In this embodiment, the plane containing the first bend pipe section 221 is parallel to the vertical center plane of the housing 30 of the fluid machinery. The vertical center plane of the housing 30 is... Figure 3 The plane shown is vertically arranged and perpendicular to the shell 30, and the vertical center plane of the shell 30 is along the length direction of the shell 30, i.e. Figure 3 It extends vertically. It can be understood that the angle between the plane where the intake pipe section 21 is located and the plane where the first bend pipe section 221 is located is the same as the angle between the plane where the intake pipe section 21 is located and the vertical center plane of the housing 30. The following description is the same, and will not be repeated hereafter.

[0036] In this embodiment, as Figure 1 and Figure 4 As shown, the first bend segment 221 includes a second arc segment 2211 and straight segments located on both sides of the second arc segment 2211. That is, the first bend segment 221 is a U-shaped bend segment. The radius R2 of the second arc segment 2211 satisfies: 5mm ≤ R2 ≤ 10mm. Specifically, the lengths of the straight segments on both sides can be equal or unequal, and the straight segments on both sides can be arranged symmetrically or asymmetrically about the centerline of the second arc segment 2211.

[0037] Furthermore, in this embodiment, as Figure 5 As shown, the included angle β between the two straight segments of the first bend 221 satisfies: 0°≤β≤30°.

[0038] In this embodiment, as Figure 3 As shown, the angle γ between the plane where the first transition pipe section 222 is located and the plane where the first bend pipe section 221 is located satisfies: 30°≤γ≤60°.

[0039] In this embodiment, the first transition pipe section 222 is an arc segment. The radius R3 of the first transition pipe section 222 satisfies: 10mm ≤ R3 ≤ 20mm. Through this configuration, the internal exhaust pipe can be transitioned from the vertical plane of the first bend pipe section 221 to the horizontal plane of the second bend pipe section 223.

[0040] In this embodiment, as Figure 1 As shown, the second bend segment 223 has a third arc segment 2231 at least at the end near the third bend segment 224, and the radius R4 of the third arc segment 2231 satisfies: 5mm ≤ R4 ≤ 10mm. Specifically, the second bend segment 223 has a third arc segment 2231 at the end near the third bend segment 224, while the end of the second bend segment 223 away from the third bend segment 224 can be either a straight segment or an arc segment.

[0041] In this embodiment, the third bend segment 224 is an arc segment. The third bend segment 224 is approximately semi-circular. The radius R5 of the third bend segment 224 satisfies: 5mm ≤ R5 ≤ 10mm.

[0042] In this embodiment, as Figure 5 As shown, the angle θ between the plane containing the third bend section 224 and the plane containing the second bend section 223 satisfies: 0°≤θ≤45°. This setting ensures that the crankshaft of the fluid machinery maintains a safe distance from the internal exhaust pipe 20 during rotation.

[0043] In this embodiment, as Figure 1 As shown, the second transition pipe section 225 has a fourth arc segment 2241 at the end near the exhaust pipe section 23. The radius R6 of the fourth arc segment 2241 satisfies: 6mm≤R6≤12mm. Furthermore, the end of the second transition pipe section 225 away from the exhaust pipe section 23 is a straight pipe section.

[0044] Furthermore, in this embodiment, as Figure 3 As shown, the angle ψ between the plane containing the second transition pipe section 225 and the plane containing the first bend pipe section 221 satisfies: 30°≤ψ≤80°. Through this arrangement, the internal exhaust pipe can be transitioned from the inclined plane containing the third bend pipe section 224 to the vertical plane containing the exhaust pipe section 23.

[0045] In this embodiment, as Figure 1 As shown, the end of the exhaust pipe section 23 away from the second transition pipe section 225 has a fifth arc segment 231, and the radius R7 of the fifth arc segment 231 satisfies: 5mm≤R7≤10mm. Specifically, in this embodiment, the exhaust pipe section 23 is composed of two U-shaped bends. The first U-shaped bend has the same shape as the first bend 221, and the second U-shaped bend has the fifth arc segment 231.

[0046] Furthermore, in this embodiment, as Figure 3 As shown, the angle λ between the plane where the exhaust pipe section 23 is located and the plane where the first bend pipe section 221 is located satisfies: 0°≤λ≤15°.

[0047] In this embodiment, the internal exhaust pipe can be integrally formed. This integral design improves the structural strength and service life of the internal exhaust pipe. Alternatively, the main pipe 22 can also be integrally formed, depending on actual needs.

[0048] In this embodiment, the internal exhaust pipe is a double-layer welded steel pipe, i.e., a Bundy pipe. Specifically, the outer diameter D, wall thickness B, and total length L of the internal exhaust pipe satisfy the following conditions: 1.8mm≤D≤3.0mm; B≤0.5mm; 300mm≤L≤500mm. Of course, the internal exhaust pipe can also be made of copper pipe or other materials such as PVC, PP, or PE plastic pipe, which can be selected according to actual needs.

[0049] Furthermore, the natural frequency of the internal exhaust pipe in this embodiment is 90Hz to 180Hz. Compared to the internal exhaust pipe of a piston compressor used in a household refrigerator, its natural frequency is increased by 1.4 to 3.0 times. The high-natural-frequency internal exhaust pipe in this embodiment is arranged within the compact internal space of the compressor, which helps to limit the displacement of the compressor core while ensuring a safe distance of 2 to 3 mm from the core and a safe distance of 4 to 5 mm from the inner wall of the compressor housing.

[0050] Furthermore, in this embodiment, a damping spring is fitted onto the internal exhaust pipe.

[0051] like Figures 2 to 4 As shown, this application also provides a fluid machine, including a cylinder base 10, a housing 30, and the aforementioned internal exhaust pipe 20. The cylinder base 10 has a muffler 11, and the housing 30 is provided with an exhaust pipe 31. The internal exhaust pipe 20 is fixedly connected to the muffler 11 and the exhaust pipe 31, respectively.

[0052] Furthermore, such as Figures 2 to 3 As shown, the fluid machinery also includes a compression spring structure 40. The compression spring structure 40 is disposed between the cylinder base 10 and the housing 30. Figure 5 As shown, the compression spring structure 40 includes a compression spring body 41, the axial stiffness of which is 0.6 N / mm to 2 N / mm. By setting the low-stiffness compression spring structure 40, the compressor core and the housing 30 achieve impedance mismatch, thereby reducing vibration transmission efficiency.

[0053] In this embodiment, the compression spring body 41 is a cylindrical helical spring. Of course, the compression spring body 41 can also be other structures with vibration isolation function. Specifically, in this embodiment, the mean diameter d1, wire diameter d2, and effective number of coils n of the compression spring body 41 satisfy the following conditions: 8.0mm≤d1≤14.0mm; 0.8mm≤d1≤1.4mm; 4≤n≤8.

[0054] In this embodiment, as Figures 2 to 4 As shown, the compressor exhaust passes through the silencer 11 on the cylinder block 10, then through the inner exhaust pipe 20 to the exhaust pipe 31 on the housing 30. The inner exhaust pipe 20 is fixed to the exhaust pipe 31 by welding, and the two are rigidly connected. Therefore, the vibration of the compressor core caused by the periodic airflow pulsation caused by the reciprocating motion of the compressor will also be transmitted to the outside of the compressor and the pipeline of the vehicle refrigerator system connected to it through this path.

[0055] Furthermore, the compressor is supported at the bottom by two feet 32, and the internal mechanism is suspended and fixed by four compression springs 40. The feet 32 ​​are welded to the bottom of the housing 30. Figure 5 As shown, the compression spring structure 40 also includes a compression spring support 42, a compression spring support sleeve 43, and a stator screw 44. The compression spring support 42 is welded inside the housing 30, the compression spring support sleeve 43 is interference-fitted to the outer edge of the compression spring support 42, the lower end of the compression spring body 41 is sleeved on the outside of the compression spring support sleeve 43, and the upper end of the compression spring body 41 is passed through by the stator screw 44. The stator screw 44 is then locked onto the mounting foot 12 of the cylinder seat 10 through the motor stator 50. Therefore, the vibration of the motor core will also be transmitted downward to the outside of the compressor and the base plate of the connected vehicle refrigerator system through this path.

[0056] This application also provides a heat exchange device, including the aforementioned fluid machinery, namely, a vehicle-mounted refrigerator including the aforementioned compressor.

[0057] In this embodiment, the vehicle refrigerator compressor adopts a composite vibration reduction structure of low stiffness compression spring structure and high solid frequency internal exhaust pipe, achieving synergistic vibration reduction of "source + path", realizing that the highest modal frequency of the core is lower than 0.8 times the lowest operating frequency of the compressor, forming an effective vibration isolation range, and significantly improving the low frequency vibration attenuation capability.

[0058] The vehicle refrigerator compressor in this embodiment can achieve coordinated vibration reduction of the internal exhaust pipe 20 and the compression spring structure 40 within a limited space, especially in low-frequency vibration attenuation, effectively reducing vibration transmission efficiency. At the same time, it has the ability to reduce the shaking amplitude of the core, reduce the number of collisions between the core and the housing 30, and make the core operation more stable, thereby improving the operating reliability of the compressor and enhancing the user experience of the vehicle refrigerator.

[0059] Table 1: Comparison of Vibration Reduction Performance Parameters of Compressors in Household and Vehicle Refrigerators

[0060]

[0061] As can be seen from Table 1 above, the vehicle-mounted refrigerator in this embodiment has good vibration reduction performance.

[0062] As can be seen from the above description, the above embodiments of this utility model achieve the following technical effects: The internal exhaust pipe includes an intake pipe section 21, a main pipe body 22, and an exhaust pipe section 23. The main pipe body 22 includes a first bend pipe section 221, a first transition pipe section 222, a second bend pipe section 223, a third bend pipe section 224, and a second transition pipe section 225 connected in sequence. The first bend pipe section 221 is connected to the intake pipe section 21, and the second transition pipe section 225 is connected to the exhaust pipe section 23. In this way, by reasonably setting the shape of each pipe section of the internal exhaust pipe, it is spatially set to adapt to the shape and direction of the fluid machinery, thereby increasing the natural frequency of the internal exhaust pipe, suppressing the resonance tendency of the vibration propagation path, and helping to reduce the airflow impact and reduce the intensity of the vibration source. This greatly improves the vibration reduction performance of the fluid machinery with the internal exhaust pipe, improves the vibration transmission between the fluid machinery's core and shell, and the refrigeration system, enhances the reliability of the fluid machinery, and thus improves the user experience.

[0063] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0065] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0066] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0067] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application 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 so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0070] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An internal exhaust pipe, characterized in that, It includes an intake pipe section (21), a main pipe body (22) and an exhaust pipe section (23). The main pipe body (22) includes a first bend pipe section (221), a first transition pipe section (222), a second bend pipe section (223), a third bend pipe section (224) and a second transition pipe section (225) connected in sequence. The first bend pipe section (221) is connected to the intake pipe section (21), and the second transition pipe section (225) is connected to the exhaust pipe section (23). The intake pipe section (21) is shaped like a 7 and the exhaust pipe section (23) is shaped like an S.

2. The internal exhaust pipe according to claim 1, characterized in that, The bend of the intake pipe section (21) has a first arc segment (211), and the radius R1 of the first arc segment (211) satisfies: 5mm≤R1≤8mm.

3. The internal exhaust pipe according to claim 1, characterized in that, The first bend (221) includes a second arc segment (2211) and straight segments located on both sides of the second arc segment (2211), wherein, The radius R2 of the second arc segment (2211) satisfies: 5mm ≤ R2 ≤ 10mm; and / or The included angle β between the two straight segments of the first bend (221) satisfies: 0°≤β≤30°.

4. The internal exhaust pipe according to claim 1, characterized in that, Both the first transition pipe section (222) and the third bend pipe section (224) are arc segments, wherein, The radius R3 of the first transition pipe section (222) satisfies: 10mm ≤ R3 ≤ 20mm; and / or The radius R5 of the third bend (224) satisfies: 5mm≤R5≤10mm.

5. The internal exhaust pipe according to claim 1, characterized in that, The second bend (223) has a third arc segment (2231) at least at one end near the third bend (224), and the radius R4 of the third arc segment (2231) satisfies: 5mm≤R4≤10mm.

6. The internal exhaust pipe according to claim 1, characterized in that, The second transition pipe section (225) has a fourth arc segment (2241) at one end near the exhaust pipe section (23), and the radius R6 of the fourth arc segment (2241) satisfies: 6mm≤R6≤12mm.

7. The internal exhaust pipe according to claim 1, characterized in that, The exhaust pipe section (23) has a fifth arc segment (231) at the end away from the second transition pipe section (225), and the radius R7 of the fifth arc segment (231) satisfies: 5mm≤R7≤10mm.

8. The internal exhaust pipe according to any one of claims 1 to 7, characterized in that, The angle α between the plane of the intake pipe section (21) and the plane of the first bend section (221) satisfies: 0°≤α≤35°; and / or The angle γ between the plane containing the first transition pipe section (222) and the plane containing the first bend pipe section (221) satisfies: 30°≤γ≤60°; and / or The angle θ between the plane containing the third bend (224) and the plane containing the second bend (223) satisfies: 0°≤θ≤45°; and / or The angle ψ between the plane containing the second transition pipe section (225) and the plane containing the first bend pipe section (221) satisfies: 30°≤ψ≤80°; and / or The angle λ between the plane where the exhaust pipe section (23) is located and the plane where the first bend pipe section (221) is located satisfies: 0°≤λ≤15°.

9. The internal exhaust pipe according to any one of claims 1 to 7, characterized in that, The internal exhaust pipe is integrally formed or the main body (22) is integrally formed.

10. The internal exhaust pipe according to any one of claims 1 to 7, characterized in that, The natural frequency of the internal exhaust pipe is 90Hz to 180Hz; and / or The internal exhaust pipe is a Bundy pipe, copper pipe, or plastic pipe.

11. A fluid machine, characterized in that, It includes a cylinder seat (10), a housing (30), and an internal exhaust pipe (20) according to any one of claims 1 to 10. The cylinder seat (10) has a muffler cavity (11), and the housing (30) is provided with an exhaust pipe (31). The internal exhaust pipe (20) is fixedly connected to the muffler cavity (11) and the exhaust pipe (31) respectively.

12. The fluid machinery according to claim 11, characterized in that, The fluid machinery also includes a compression spring structure (40) disposed between the cylinder seat (10) and the housing (30). The compression spring structure (40) includes a compression spring body (41) with an axial stiffness of 0.6 N / mm to 2 N / mm.

13. A heat exchange device, characterized in that, The fluid machinery included in any one of claims 11 to 12.

14. The heat exchange device according to claim 13, characterized in that, The heat exchange device is a vehicle-mounted refrigerator.

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