Air inlet structure

Abstract

The invention belongs to the technical field of compressors, and discloses an air inlet structure which comprises an air inlet connecting pipe, the first end of the air inlet connecting pipe is used for being connected with an air inlet hole of an air cylinder in an inserted mode, the first end of the air inlet connecting pipe comprises a first pipe part and a second pipe part, and the first pipe part and the second pipe part are sequentially arranged in the axial direction of the air inlet connecting pipe. And compared with the first pipe part, the second pipe part is positioned on one side opposite to the end part of the first end of the air inlet connecting pipe. According to the air inlet structure, when the first end of the air inlet connecting pipe is inserted into the air inlet hole, the first pipe part is fixedly connected with the inner circumferential wall of the air inlet hole, the second pipe part and the inner circumferential wall of the air inlet hole jointly form the gap communicating with the outer side of the air cylinder, oil or a refrigerant in the compressor can enter the gap, and the flow speed is obviously reduced; the heat transfer resistance of a high-temperature environment to the air inlet connecting pipe through the air cylinder can be increased with a small heat exchange coefficient, so that the air suction heat exchange amount is reduced, and the volume efficiency and the overall performance of the compressor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to an air intake structure. Background Art

[0002] In the prior art, the air intake structure at the part of the air intake connecting pipe 1' and the cylinder 2' of the compressor is referred to Figure 1 as shown. Specifically, the air intake connecting pipe 1' of the cylinder is inserted into the air intake hole 21' of the cylinder 2'. The outer peripheral wall of the air intake connecting pipe 1' is in interference fit with the inner peripheral wall of the air intake hole 21', and the air intake hole 21' communicates with the suction chamber of the cylinder 2'. During the refrigeration cycle of the compressor, the superheated saturated steam at the outlet of the evaporator reaches the suction chamber of the cylinder 2' through the liquid receiver (not shown) and the air intake connecting pipe 1'.

[0003] Affected by the high-temperature refrigerant outside the pump body and the oil sump, the refrigerant will absorb heat and increase in temperature when flowing through the air intake connecting pipe 1'. This part of heat exchange is called ineffective heat exchange, which reduces its own density and then reduces the suction volume, resulting in a decrease in the compression efficiency of the pump body and affecting the overall performance of the compressor. Summary of the Invention

[0004] The purpose of the present invention is to provide an air intake structure and a compressor, which have a simple structure. A gap communicating with the inside of the housing can be formed between the air intake connecting pipe and the air intake hole. The oil or refrigerant in the compressor can enter the gap and the flow rate is significantly reduced, which can increase the heat transfer resistance from the high-temperature environment to the air intake connecting pipe through the cylinder with a smaller heat transfer coefficient, thereby reducing the suction heat exchange amount and improving the volumetric efficiency and the overall performance of the compressor.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] An air intake structure includes an air intake connecting pipe, and the first end of the air intake connecting pipe is used for being inserted into the air intake hole of the cylinder; wherein,

[0007] The first end of the air intake connecting pipe includes a first pipe portion and a second pipe portion. The first pipe portion and the second pipe portion are arranged in sequence along the axial direction of the air intake connecting pipe, and the second pipe portion is located on the side of the end away from the first end of the air intake connecting pipe compared with the first pipe portion;

[0008] When the first end of the air intake connecting pipe is inserted into the air intake hole, the first pipe portion is fixedly connected to the inner peripheral wall of the air intake hole, and the second pipe portion and the inner peripheral wall of the air intake hole jointly form a gap, and the gap is communicated with the outside of the cylinder.

[0009] Preferably, the air inlet hole includes a first hole portion and a second hole portion which are arranged in sequence from inside to outside. The first hole portion and the second hole portion are arranged in a stepped manner. The aperture of the first hole portion is smaller than that of the second hole portion. The outer peripheral walls of the first pipe portion and the second pipe portion are flush with each other.

[0010] Preferably, the air inlet hole includes a first hole portion and a second hole portion. The first hole portion and the second hole portion are communicated with each other in sequence from inside to outside along the opening direction of the air inlet hole. The first hole portion and the second hole portion have the same diameter. The first pipe portion and the second pipe portion are arranged in a stepped manner. The outer diameter of the first pipe portion is larger than that of the second pipe portion.

[0011] Preferably, the depth of the first end of the air inlet connecting pipe inserted into the air inlet hole is L, the length of the first pipe portion is L1, the length of the second pipe portion is L2, and the total length of the air inlet hole is Ltotal. Then:

[0012]

[0013] Preferably, a chamfer or a fillet is provided at the outer port of the air inlet hole.

[0014] Preferably, the material of the air inlet connecting pipe is set as copper or steel.

[0015] Preferably, the first pipe portion and the second pipe portion are integrally formed.

[0016] Preferably, a socket is provided on the outer peripheral wall of the first pipe portion, and a socket groove is provided on the inner peripheral wall of the air inlet hole. The socket is adapted to be inserted into the socket groove when the first pipe portion extends into the air inlet hole.

[0017] Preferably, the thickness dimension of the gap is δ, and δ satisfies: 0.5mm ≤ δ ≤ 1mm.

[0018] A compressor includes:

[0019] A cylinder with an air inlet hole opened therein;

[0020] The air inlet structure as described in any one of the above. The first end of the air inlet connecting pipe is inserted into the air inlet hole and is communicated with the air inlet hole. The second end of the air inlet connecting pipe is inserted into a liquid storage connecting pipe and is communicated with the liquid storage connecting pipe.

[0021] Beneficial effects:

[0022] The intake structure provided by the present invention is such that when the first end of the intake connection pipe is inserted into the intake hole, the first pipe portion is fixedly connected to the inner peripheral wall of the intake hole, and a gap communicating with the outside of the cylinder is formed jointly by the second pipe portion and the inner peripheral wall of the intake hole. The existence of the gap can form a heat insulation interval. When the compressor is in an operating state, the oil or refrigerant in the compressor can enter the gap and the flow rate significantly slows down, which can increase the heat transfer resistance from the high-temperature environment to the intake connection pipe through the cylinder with a relatively small heat transfer coefficient, thereby reducing the suction heat exchange amount and improving the volumetric efficiency and the overall performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic cross-sectional view of the intake structure in the prior art;

[0024] Figure 2 is a schematic cross-sectional view of the intake structure provided by an embodiment of the present invention;

[0025] Figure 3 is an exploded schematic cross-sectional view of the intake structure provided by an embodiment of the present invention;

[0026] Figure 4 is a schematic cross-sectional view of the intake structure provided by another embodiment of the present invention;

[0027] Figure 5 is an exploded schematic cross-sectional view of the intake structure provided by another embodiment of the present invention;

[0028] Figure 6 is a schematic view of the insertion slot and the plug joint part provided by the present invention;

[0029] Figure 7 is a comparative experimental data graph of the intake structure of the present invention and the intake structure in the prior art;

[0030] Figure 8 is another comparative experimental data graph of the intake structure of the present invention and the intake structure in the prior art.

[0031] In the figures:

[0032] 1', intake connection pipe; 2', cylinder; 21', intake hole;

[0033] 1, intake connection pipe; 11, first pipe portion; 111, plug joint; 12, second pipe portion;

[0034] 2, cylinder; 21, intake hole; 2101, insertion slot; 211, first hole portion; 212, second hole portion;

[0035] 3, gap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] This embodiment provides a compressor, and the compressor includes a cylinder, and an air inlet hole is provided in the cylinder. The compressor further includes an air intake structure. Refer to Figures 2 to 5 As shown, the air intake structure includes an air intake connecting pipe 1, and the first end of the air intake connecting pipe 1 is used for being inserted into the air inlet hole 21 of the cylinder 2. Specifically, the first end of the air intake connecting pipe 1 includes a first pipe portion 11 and a second pipe portion 12, the first pipe portion 11 and the second pipe portion 12 are arranged in sequence along the axial direction of the air intake connecting pipe 1, and the second pipe portion 12 is located on the side of the end of the air intake connecting pipe 1 facing away from the first end compared with the first pipe portion 11. The first end of the air intake connecting pipe 1 is inserted into the air inlet hole 21 and is communicated with the air inlet hole 21, and the second end of the air intake connecting pipe 1 is inserted into the liquid storage connecting pipe and is communicated with the liquid storage connecting pipe.

[0041] When the first end of the intake connection pipe 1 is inserted into the intake hole 21, the first pipe portion 11 is fixedly connected to the inner peripheral wall of the intake hole 21, and the second pipe portion 12 and the inner peripheral wall of the intake hole 21 together form a gap 3, and the gap 3 is communicated with the outside of the cylinder 2.

[0042] In this embodiment, when the intake connection pipe 1 is inserted and assembled into the intake hole 21 of the cylinder 2, the first pipe portion 11 is fixedly connected to the inner peripheral wall of the intake hole 21, and the second pipe portion 12 and the inner peripheral wall of the intake hole 21 together form a gap 3 communicated with the outside of the cylinder 2. The existence of the gap 3 can form a heat insulation interval. When the compressor is in operation, the oil or refrigerant in the compressor can enter the gap 3 and the flow rate is significantly reduced, which can increase the heat transfer resistance from the high-temperature environment to the intake connection pipe 1 through the cylinder 2 with a smaller heat transfer coefficient, thereby reducing the suction heat exchange amount and improving the volumetric efficiency and the overall performance of the compressor.

[0043] As an alternative embodiment, referring to Figures 2 to 3 As shown, the intake hole 21 includes a first hole portion 211 and a second hole portion 212 arranged in sequence from inside to outside. The first hole portion 211 and the second hole portion 212 are arranged in a stepped shape. The aperture of the first hole portion 211 is smaller than that of the second hole portion 212, and the outer peripheral walls of the first pipe portion 11 and the second pipe portion 12 are flush. When the first end of the intake connection pipe 1 is inserted into the intake hole 21, the first pipe portion 11 is in interference fit with the first hole portion 211, and the second pipe portion 12 and the second hole portion 212 together form the gap 3.

[0044] In this embodiment, the outer peripheral wall of the first end of the intake connection pipe 1 is set flush, and the intake hole 21 is correspondingly set in a stepped shape. The first pipe portion 11 is inserted into the first hole portion 211 with interference, and a gap 3 is formed between the second pipe portion 12 and the second hole portion 212.

[0045] As an alternative embodiment, referring to Figures 4 to 5 As shown, the difference between this embodiment and the above embodiment is that the first hole portion 211 and the second hole portion 212 have the same diameter, the first pipe portion 11 and the second pipe portion 12 are arranged in a stepped shape, and the outer diameter of the first pipe portion 11 is larger than that of the second pipe portion 12. When the first end of the intake connection pipe 1 is inserted into the intake hole 21, the first pipe portion 11 is in interference fit with the first hole portion 211, and the second pipe portion 12 and the second hole portion 212 together form the gap 3.

[0046] Continuing to refer to Figures 2 to 5 As shown, considering the thermal conductivity and convective heat transfer characteristics comprehensively, there is an effective heat insulation interval in the gap 3 between the intake connection pipe 1 and the intake hole 21. After adding the gap 3 in this application, the unit length radial thermal resistance of the heat transfer from the cylinder 2 to the refrigerant in the intake connection pipe 1 is increased to:

[0047]

[0048] Wherein, r1 and r2 are respectively the inner and outer diameters of the second pipe portion 12, r3 is the inner diameter of the second hole portion 212, and r3 = 2(r2 + δ). k1 and k2 are respectively the thermal conductivities of the second pipe portion 12 and the refrigerant in the gap. Through theoretical analysis and combined with process considerations, the preferred setting range of the thickness dimension of the gap 3 between the second hole portion 212 and the second pipe portion 12 is:

[0049] 0.5mm ≤ 0δ < 1mm.

[0050] By setting the thickness dimension δ of the gap 3 within the above-mentioned dimension range, the gap 3 is made thin enough so that fluids such as lubricating oil in the compressor housing that play a role in cooling and lubrication can enter the gap 3, and then the flow velocity of the cooling fluid in the gap 3 will be extremely slow or even stationary. According to the convective heat transfer formula in the pipe: h = ff(V0.8), it can be known that the convective heat transfer coefficient is proportional to the flow velocity, and when the velocity decreases, it decreases at a higher proportion, and when the fluid is stationary, the convective heat transfer coefficient can be further reduced.

[0051] Continue to refer to Figures 2 to 5 As shown, the insertion depth of the first end of the intake connection pipe 1 into the intake hole 21 is L, the length of the first pipe portion 11 is L1, the length of the second pipe portion 12 is L2, and the total length of the intake hole 21 is Ltotal.

[0052] In this embodiment, L = L1 + L2, that is, the insertion depth of the first end of the intake connection pipe 1 into the intake hole 21 is equal to the sum of the lengths of the first pipe portion 11 and the second pipe portion 12.

[0053] In this embodiment, in order to ensure a reliable sealing distance and considering the influence of the structure at the inner end of the intake hole 21 and the convective resistance at the end of the intake connection pipe 1, the insertion depth L of the first end of the intake connection pipe 1 into the intake hole 21 satisfies the following quantitative relationship:

[0054] In this embodiment, in order to achieve a reliable heat insulation effect, the length of the second pipe portion 12 can be appropriately increased. The second pipe portion 12 satisfies the following quantitative relationship:

[0055] In this embodiment, the length of the first hole portion 211 is greater than or equal to the length of the first pipe portion 11, and the length of the second hole portion 212 is equal to the length of the second pipe portion 12.

[0056] In this embodiment, a chamfer or a fillet is provided at the outer port of the air inlet hole 21. With such a setting, it is possible to provide a certain guiding effect during the process of inserting the first end of the air inlet connecting pipe 1 into the air inlet hole 21. Even if the air inlet connecting pipe 1 and the air inlet hole 21 are not completely coaxially aligned, under the action of the chamfer or the fillet, the air inlet connecting pipe 1 can be moved to the alignment position. The structure is simple and convenient for insertion.

[0057] In this embodiment, the first pipe portion 11 and the second pipe portion 12 are integrally formed. Since the structures of the first pipe portion 11 and the second pipe portion 12 are not complicated, the integral forming has higher processing efficiency, and the process of separately assembling the first pipe portion 11 and the second pipe portion 12 can be omitted, simplifying the production and assembly process.

[0058] As an alternative embodiment, referring to Figure 6 As shown, a plug connector 111 is provided on the outer peripheral wall of the first pipe portion 11, and a plug slot 2101 is provided on the inner peripheral wall of the air inlet hole 21. The plug connector 111 is adapted to be inserted into the plug slot 2101 when the first pipe portion 11 extends into the air inlet hole 21. Specifically, the plug slot 2101 is provided on the inner peripheral wall of the first hole portion 211. The cooperation between the plug connector 111 and the plug slot 2101 can play a guiding role in the insertion of the air inlet connecting pipe 1. Even if there is an interference fit between the first pipe portion 11 and the first hole portion 211, the first pipe portion 11 may still be circumferentially displaced relative to the first hole portion 211 when subjected to excessive external force. With the cooperation of the plug slot 2101 and the plug connector 111, the circumferential displacement of the first pipe portion 11 relative to the first hole portion 211 is avoided, further ensuring the reliability and stability of the connection.

[0059] In this embodiment, the material of the air inlet connecting pipe 1 is set as copper or steel. The material of the cylinder 2 is set as powder metallurgy or cast iron. The material of the liquid reservoir inlet pipe is set as copper.

[0060] Exemplarily, a control group experiment is jointly set up for the air inlet structure provided in this embodiment and the air inlet structure in the prior art. The experimental result data graphs of the COP (Coefficient of Performance) and APF (Annual Performance Factor) of the compressor are respectively referred to Figures 7 to 8 As shown. Among them, in the case of conducting an experiment using the air inlet structure provided in this embodiment, in Figure 7 , the COP under each working condition on the abscissa is improved to varying degrees compared with the structure in the prior art, and the improvement is most significant in the low-temperature heating working condition, with the COP increased by 2.8%. In Figure 8 , the APF value is increased by 1.16%.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. An air intake structure, characterized in that: It comprises an air intake connecting pipe (1), the first end of which is used to be plugged into an air intake hole (21) of a cylinder (2); wherein: The first end of the air intake connecting pipe (1) comprises a first pipe portion (11) and a second pipe portion (12), the first pipe portion (11) and the second pipe portion (12) being arranged in sequence along the axial direction of the air intake connecting pipe (1), and the second pipe portion (12) is located on a side of an end portion facing away from the first end of the air intake connecting pipe (1) compared to the first pipe portion (11); When the first end of the air intake connecting pipe (1) is inserted into the air intake hole (21), the first pipe portion (11) is fixedly connected to the inner peripheral wall of the air intake hole (21), and the second pipe portion (12) and the inner peripheral wall of the air intake hole (21) together form a gap (3), and the gap (3) is connected to the outer side of the cylinder (2).

2. The air intake structure according to claim 1, characterized in that: The air inlet hole (21) comprises a first hole portion (211) and a second hole portion (212) which are arranged in sequence from the inside to the outside, the first hole portion (211) and the second hole portion (212) are arranged in a stepped manner, the hole diameter of the first hole portion (211) is smaller than the hole diameter of the second hole portion (212), and the outer peripheral walls of the first tube portion (11) and the second tube portion (12) are arranged flush.

3. The air intake structure according to claim 1, characterized in that: The air inlet hole (21) comprises a first hole portion (211) and a second hole portion (212); the first hole portion (211) and the second hole portion (212) are connected in sequence from the inside to the outside along the opening direction of the air inlet hole (21); the first hole portion (211) and the second hole portion (212) are arranged with the same diameter; the first tube portion (11) and the second tube portion (12) are arranged in a stepped shape; the outer diameter of the first tube portion (11) is greater than the outer diameter of the second tube portion (12).

4. The air intake structure according to claim 1, characterized in that: The depth to which the first end of the air intake connecting pipe (1) is inserted into the air intake hole (21) is L, the length of the first pipe portion (11) is L1, the length of the second pipe portion (12) is L2, and the total length of the air intake hole (21) is Ltotal, then: L=L1+L2; 5. The air intake structure according to claim 1, characterized in that: The outer side port of the air inlet (21) is provided with a chamfer or a rounded corner.

6. The air intake structure according to claim 1, characterized in that: The material of the air intake connecting pipe (1) is copper or steel.

7. The air intake structure according to claim 1, characterized in that: The first tube portion (11) and the second tube portion (12) are integrally formed.

8. The air intake structure according to claim 1, characterized in that: The outer peripheral wall of the first tube portion (11) is provided with a plug connector (111), and the inner peripheral wall of the air inlet hole (21) is provided with a plug connector groove (2101), and the plug connector (111) is suitable for being plugged into the plug connector groove (2101) when the first tube portion (11) extends into the air inlet hole (21).

9. The air intake structure according to claim 1, characterized in that: The thickness dimension of the gap (3) is δ, and δ satisfies: 0.55mm≤δ≤1mm.

10. A compressor, characterized in that: include: The cylinder (2) is provided with an air inlet hole (21); According to the air intake structure as described in any one of claims 1 to 9, the first end of the air intake connecting pipe (1) is inserted into the air intake hole (21) and is connected to the air intake hole (21), and the second end of the air intake connecting pipe (1) is inserted into the liquid reservoir connecting pipe and is connected to the liquid reservoir connecting pipe.

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