Air suction structure and compressor

Abstract

The invention relates to an air suction structure and a compressor, and belongs to the technical field of compressors, the air suction structure comprises a main air suction flow channel formed in an upper air cylinder, the main air suction flow channel penetrates through the wall of the upper air cylinder, and the main air suction flow channel is divided into an upper air suction branch coaxial with the main air suction flow channel in the air suction direction; the lower air suction branch passes through the upper air cylinder, the middle plate and the lower air cylinder; the lower air suction branch comprises a lower air suction flow channel formed in the side wall of the upper air cylinder. The air suction hole is formed in the lower air cylinder; the air suction through-flow hole is formed in the middle plate and communicated with the lower air suction branch and the air suction hole, the axis of the air suction through-flow hole is perpendicular to the plane where the middle plate is located, and the extension line of the longest axis of the cross section of the air suction through-flow hole passes through the circle center of the inner circle of the middle plate. Compared with the prior art, the lower air suction flow channel of the upper air cylinder and the structure and the geometric dimension of the air suction through-flow hole of the middle plate are reasonably arranged, so that the effective through-flow area is increased, the air suction efficiency is improved, and the working performance of the compressor is improved.

Description

Technical Field

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

[0002] A compressor is a fluid machine that raises low-pressure gas to high-pressure gas. During operation, low-temperature and low-pressure refrigerant gas enters the cylinder from the intake pipe. After being compressed by the cylinder, high-temperature and high-pressure refrigerant gas is discharged from the exhaust pipe, providing power for the refrigeration cycle, thereby realizing the refrigeration cycle of compression → condensation → expansion → evaporation.

[0003] In the existing compressor air intake structure, as Figure 1-7 recorded, the lower air intake flow channel of the upper cylinder in this structure is a flow channel perpendicular to the end face of the upper cylinder, that is, the included angle α = 90°, and the cross-section of the lower air intake flow channel is a transverse waist-shaped structure or a circular structure. Correspondingly, the cross-sections of the air intake through-flow holes of the intermediate plate and the air intake port of the lower cylinder do not match the cross-section of the outlet of the lower air intake flow channel, and the projection parts overlap. The shape structure of the air intake flow channel determines the uniformity of the refrigerant flow velocity, and the flow velocity is directly related to the flow rate. The more uneven the flow velocity distribution, the less the flow rate. For example, Figure 14 in the A area shown, the distribution of the air intake velocity is extremely uneven. This phenomenon directly affects the air intake volume of the lower air intake flow channel, that is, it causes the air intake flow rate of the lower air intake flow channel to be small and the flow resistance to be large, resulting in low lower air intake efficiency, poor overall performance of the compressor, that is, small effective flow area, low air intake efficiency, high power consumption, low cooling capacity, and poor performance. Summary of the Invention

[0004] The present invention provides an air intake structure and a compressor to solve the problem that in the existing compressor air intake structure, due to the limitation of the existing air intake flow channel structure, the effective flow area of the lower air intake branch is small, the air intake efficiency is low, resulting in high power consumption, low cooling capacity, and poor performance.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] One object of the present invention is an air intake structure applied to a compressor. The compressor includes an upper cylinder, a lower cylinder, and an intermediate plate located between the upper cylinder and the lower cylinder. The air intake structure includes: a main air intake flow channel opened on the upper cylinder, the main air intake flow channel penetrating the upper cylinder wall, and the main air intake flow channel being divided into an upper air intake branch coaxial with the main air intake flow channel along the air intake direction, and a lower air intake branch penetrating the upper cylinder, the intermediate plate, and the lower cylinder;

[0007] The lower air suction branch includes: a lower air suction flow path opened on the side wall of the upper cylinder; a suction hole opened on the lower cylinder; a suction through-flow hole opened on the intermediate plate, the suction through-flow hole communicating the lower air suction flow path and the suction hole, the axis of the suction through-flow hole being perpendicular to the plane where the intermediate plate is located, and the extension line of the longest axis of the cross-section of the suction through-flow hole passing through the center of the inner circle of the intermediate plate;

[0008] Wherein, the lower air suction flow path is an arched flow path, the extension line of the longest axis of the cross-section of the arched flow path passes through the center of the inner circle of the upper cylinder, the first end of the longest axis of the cross-section of the arched flow path uniformly contracts along the direction away from the inner circle of the upper cylinder (7), the included angle between the connecting line of the endpoints of the first ends of the longest axes of all cross-sections of the arched flow path and the plane where the upper cylinder is located is α, and α≠90°. Preferably, the included angle α satisfies 30°≤α<90°. More preferably, the included angle α satisfies 45°≤α≤75°, for example, 45°, 50°, 55°, 60°, 65°, 70°, 75°.

[0009] Further, the side of the suction through-flow hole close to the inner circle of the intermediate plate bulges inwardly towards the inner circle side, the length from the most convex point of the side to the center of the circle minus the radius of the inner circle is d, and d≥2mm is satisfied.

[0010] Further, the side of the suction through-flow hole close to the inner circle of the intermediate plate is recessed inwardly towards the inner circle side, the length from the most concave point of the side to the center of the circle is R, and R≥the radius r of the inner circle of the upper cylinder is satisfied.

[0011] Further, the side of the suction through-flow hole close to the inner circle of the intermediate plate is a straight edge perpendicular to the radius of the inner circle of the intermediate plate, and the straight edge perpendicularly intersects with the radius of the inner circle of the intermediate plate passing through the midpoint of the straight edge.

[0012] Further, the projection of the outlet cross-section of the lower air suction flow path of the upper cylinder coincides with the inlet cross-section of the suction port of the lower cylinder.

[0013] Further, except for the side close to the inner circle of the intermediate plate, the other sides of the suction through-flow hole of the intermediate plate coincide with the projection of the outlet cross-section of the lower air suction flow path of the upper cylinder.

[0014] Further, except for the side close to the inner circle of the intermediate plate, the projection of the other sides of the suction through-flow hole of the intermediate plate coincides with the inlet cross-section of the suction port of the lower cylinder.

[0015] The second object of the present invention is a compressor, including the suction structure described in any one of the above.

[0016] Further, the compressor is a rolling rotor type compressor.

[0017] Compared with the prior art, in the present invention, the extension line of the longest axis of the cross-section of the downward suction flow channel passes through the center of the inner circle of the upper cylinder, the axis of the suction flow through hole of the middle plate is perpendicular to the plane where the middle plate is located, and the projection of the outlet cross-section of the downward suction flow channel of the upper cylinder coincides with the inlet cross-section of the suction port of the lower cylinder. In this way, the effective suction flow area can be maximally increased, thereby improving the suction efficiency. In addition, in the present invention, the downward suction flow channel is an arched flow channel with the outlet facing the inner circle of the lower cylinder. The included angle between the connecting line of the first end points of the longest axes of all cross-sections of the arched flow channel and the plane where the upper cylinder is located is α, and 30° ≤ α < 90°. The inclined downward suction channel can minimize the change in the gas flow direction during suction, reduce the local gas loss, increase the suction volume, thereby improving the suction efficiency and the energy efficiency of the compressor. Description of the Drawings

[0018] Figure 1 It is a sectional view of the production pump body - assembly result in the prior art;

[0019] Figure 2 It is a schematic diagram of the included angle α of the suction flow through hole of the upper cylinder in the prior art being 90°;

[0020] Figure 3 It is one of the schematic diagrams of the upper cylinder in the prior art;

[0021] Figure 4 It is another schematic diagram of the upper cylinder in the prior art;

[0022] Figure 5 It is one of the schematic diagrams of the middle plate in the prior art;

[0023] Figure 6 It is another schematic diagram of the middle plate in the prior art;

[0024] Figure 7 It is a schematic diagram of the lower cylinder in the prior art;

[0025] Figure 8 It is a sectional view of the pump body - assembly result in the present invention;

[0026] Figure 9 It is a schematic diagram of the included angle α of the suction flow through hole of the upper cylinder in the present invention;

[0027] Figure 10 It is a schematic diagram of the upper cylinder in Embodiments 1 - 3 of the present invention;

[0028] Figure 11 It is a schematic diagram of the middle plate in Embodiment 1 of the present invention;

[0029] Figure 12 It is a schematic diagram of the middle plate in Embodiment 2 of the present invention;

[0030] Figure 13Schematic diagram of the intermediate plate in Embodiment 3 of the present invention;

[0031] Figure 14 Velocity vector distribution diagram of the air suction flow path in the prior art;

[0032] Figure 15 Velocity vector distribution diagram of the air suction flow path in Embodiment 1 of the present invention;

[0033] As shown in the figure by the reference numerals: 1 - lower air cylinder; 2 - air suction port; 3 - intermediate plate; 4 - the first air suction through - hole in the prior art; 5 - the second air suction through - hole in the prior art; 6 - air suction through - hole; 7 - upper air cylinder; 8 - lower air suction flow path; 9 - the first lower air suction flow path outlet of the upper air cylinder in the prior art; 10 - the second lower air suction flow path outlet of the upper air cylinder in the prior art; 11 - main air suction flow path; 12 - upper air suction branch; 13 - lower air suction flow path; 14 - inner circle of the upper air cylinder; 15 - the longest axis of the first lower air suction flow path outlet of the upper air cylinder in the prior art; 16 - the longest axis of the first air suction through - hole in the prior art; 17 - the longest axis of the cross - section of the air suction through - hole; 18 - inner circle of the intermediate plate; 19 - side of the air suction through - hole close to the inner circle of the intermediate plate; 20 - the longest axis of the cross - section of the lower air suction flow path. Detailed implementation manners

[0034] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, not all structures.

[0035] In the description of the embodiments 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 internal communication of 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.

[0036] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of the embodiments of the present invention, the orientation or positional relationships such as "above", "below", "right" and the like are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, 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 should not be construed 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 meanings.

[0038] Embodiment 1

[0039] See details in Figure 8-11 In this embodiment, an intake structure is provided, which is applied to a rolling rotor compressor. The compressor includes an upper cylinder 7, a lower cylinder 1, and an intermediate plate 3 located between the upper cylinder 7 and the lower cylinder 1; the intake structure includes: a main intake flow passage 11 opened on the upper cylinder 7, the main intake flow passage 11 penetrating the upper cylinder wall, and the main intake flow passage 11 being divided into an upper intake branch 12 coaxial with the main intake flow passage 11 along the intake direction, and a lower intake branch 13 penetrating the upper cylinder 7, the intermediate plate 3 and the lower cylinder 1;

[0040] The lower intake branch 13 includes: a lower intake flow passage 8 opened on the side wall of the upper cylinder 7; an intake hole 2 opened on the lower cylinder 1; an intake through-hole 6 opened on the intermediate plate 3, the intake through-hole 6 connecting the lower intake flow passage 8 and the intake hole 2, the axis of the intake through-hole 6 being perpendicular to the plane where the intermediate plate 3 is located, and the extension line of the longest axis (i.e., Figure 11-13 the reference numeral 17 in the figure) of the cross-section of the intake through-hole 6 passing through the center of the inner circle of the intermediate plate 3.

[0041] Wherein, the lower intake flow passage 8 is an arched flow passage, the longest axis of the cross-section of the arched flow passage is Figure 10 the reference numeral 20 in the figure, the extension line of the longest axis of the cross-section of the arched flow passage passes through the center of the inner circle of the upper cylinder 7, the first end of the longest axis of the cross-section of the arched flow passage uniformly contracts along the direction away from the inner circle 14 of the upper cylinder 7, the included angle between the connection line of the end points of the first ends of the longest axes of all cross-sections of the arched flow passage and the plane where the upper cylinder 7 is located is α, and α≠90°, preferably, 30°≤α<90°.

[0042] Optionally, in this embodiment, the included angle α satisfies 45° ≤ α ≤ 75°, such as 45°, 50°, 55°, 60°, 65°, 70°, 75°. Within this value range, the change in the gas flow direction during inhalation can be better reduced, the local gas loss can be reduced, the inhalation volume can be increased, thereby improving the inhalation efficiency, and making the performance of the cylinder using this inhalation structure better.

[0043] Please refer to Figure 10 , in this embodiment, the extension line of the major axis of the cross-section of the lower inhalation flow channel 8 of the upper cylinder 7 passes through the center of the inner circle of the upper cylinder 7. Compared with the cross-section of the lower inhalation flow channel 8 of the upper cylinder 7 in the prior art being a transverse waist-shaped structure or a circular structure, and the longest axis direction of the transverse waist-shaped structure being arranged along the radial direction of the upper cylinder 7, the designed lower inhalation flow channel 8 in this embodiment can increase the effective inhalation flow area, thereby improving the inhalation efficiency and making the performance of the cylinder using this inhalation structure better. This can be seen from the comparison of the inhalation flow channel velocity vector distribution diagrams in Figure 14 、 15 .

[0044] Please refer to Figure 11 , in this embodiment, the side of the inhalation flow hole 6 close to the inner circle of the middle plate 3 (i.e., Figure 11 the label 19 in

[0045] bulges inward towards the inner circle. The length from the most convex point of the side to the center of the circle minus the inner circle radius is d, and d ≥ 2 mm. Within this value range, the effective inhalation flow area can be increased, thereby improving the inhalation efficiency and making the performance of the cylinder using the inhalation structure better.

[0046] Taking a certain specification of a double-cylinder single-inhalation model as an example, the energy efficiency simulation calculation results of the original scheme and the scheme of this embodiment are shown in the following table:

[0047] parameter original scheme scheme of this embodiment comparison Cooling capacity of upper cylinder (W) 3481.8 3483.5 0.05％ PV work of upper cylinder (W) 1110.5 1111.9 0.13％ COP of upper cylinder 3.14 3.13 -0.08％ Cooling capacity of lower cylinder (W) 3496.6 3514.3 0.50％ PV work of lower cylinder (W) 1132.4 1133.5 0.09％ COP of lower cylinder 3.09 3.10 0.41％

[0048] As can be seen from the above table, after the compressor of this specification uses the suction structure of this embodiment, compared with using the existing cylinder, the COP of the upper cylinder slightly decreases, but the COP of the lower cylinder is significantly improved, and the total COP is increased, and the refrigeration performance is significantly improved. It can be seen that by reasonably setting the lower suction flow channel 13 in the upper cylinder 7 and the structure and geometric dimensions of the suction through-flow holes 6 in the intermediate plate 3 in this embodiment, the effective through-flow area is increased, the suction efficiency is increased, and the working performance of the compressor is improved.

[0049] Figure 14 It is the velocity vector distribution diagram of the suction flow channel in the prior art. In the figure, the redder the color, the greater the velocity, and the bluer the color, the smaller the velocity. From Figure 14 it can be clearly seen that in area A, the distribution of the suction velocity is extremely uneven. This phenomenon directly affects the suction volume of the lower suction flow channel, resulting in low lower suction efficiency and poor overall performance of the compressor. Figure 15 It is the velocity vector distribution diagram of the suction flow channel in this embodiment. It can be clearly seen from the figure that compared with the prior art, the velocity distribution at the lower suction flow channel in this embodiment is significantly more uniform, which is beneficial to the suction of the compressor.

[0050] Based on the same concept, this embodiment also provides a compressor, which is a rolling piston compressor and includes the suction structure provided above in this embodiment. Since the suction structure of the cylinder effectively increases the effective suction through-flow area and reduces the local resistance loss when the air flow enters the working chamber of the compressor, the overall efficiency of the compressor is improved.

[0051] Embodiment 2

[0052] This embodiment is basically the same as Embodiment 1, except that the side of the suction through-flow hole 6 close to the inner circle of the intermediate plate 3 is recessed inward towards the inner circle, that is Figure 11 the side of the suction through-flow hole close to the inner circle of the intermediate plate 19 is recessed inward towards the inner circle, and the length from the deepest point of the side to the center of the circle is R, satisfying R≥the radius r of the inner circle 14 of the upper cylinder. Please refer to Figure 12 .

[0053] Embodiment 3

[0054] This embodiment is basically the same as Embodiment 1, except that the side of the suction through-flow hole 6 close to the inner circle of the intermediate plate 3 is a straight edge, that is Figure 11 the side of the suction through-flow hole close to the inner circle of the intermediate plate 19 is a straight edge, and the straight edge is perpendicular to the radius of the inner circle 18 of the intermediate plate passing through the midpoint of the straight edge. Please refer to Figure 13 .

[0055] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in any other form. Any person skilled in the relevant art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An intake structure is applied to a compressor. The compressor includes an upper cylinder (7), a lower cylinder (1), and an intermediate plate (3) located between the upper cylinder (7) and the lower cylinder (1). It is characterized in that, The suction structure includes: a main suction air flow passage (11) opened on the upper cylinder (7), the main suction air flow passage (11) penetrating the upper cylinder wall, the main suction air flow passage (11) being divided into an upper suction branch (12) coaxial with the main suction air flow passage (11) along the suction direction, and a lower suction branch (13) penetrating the upper cylinder (7), the intermediate plate (3) and the lower cylinder (1); The lower suction branch (13) includes: a lower suction air flow passage (8) opened on the upper cylinder (7); a suction hole (2) opened on the lower cylinder (1); a suction through-flow hole (6) opened on the intermediate plate (3), the suction through-flow hole (6) connecting the lower suction air flow passage (8) and the suction hole (2), the axis of the suction through-flow hole (6) being perpendicular to the plane where the intermediate plate (3) is located, and the extension line of the longest axis of the cross-section of the suction through-flow hole (6) passing through the center of the inner circle of the intermediate plate (3); Wherein, the lower suction air flow passage (8) is an arched flow passage, the extension line of the longest axis of the cross-section of the arched flow passage passing through the center of the inner circle of the upper cylinder (7), the first end of the longest axis of the cross-section of the arched flow passage uniformly contracting along the direction away from the inner circle of the upper cylinder (7), the included angle between the connection line of the end points of the first ends of the longest axes of all cross-sections of the arched flow passage and the plane where the upper cylinder (7) is located being α, and satisfying 30°≤α<90°.

2. The intake structure according to claim 1, characterized in that, The side of the suction through-flow hole (6) close to the inner circle of the intermediate plate (3) bulges inward towards the inner circle, and the length from the most convex point of the side to the center of the circle minus the inner circle radius is d, satisfying d≥2mm.

3. The intake structure according to claim 1, characterized in that, The side of the suction through-flow hole (6) close to the inner circle of the intermediate plate (3) is concave inward towards the inner circle, and the length from the most concave point of the side to the center of the circle is R, satisfying R≥the inner circle radius r of the upper cylinder.

4. The intake structure according to claim 1, characterized in that, The side of the suction through-flow hole (6) close to the inner circle of the intermediate plate (3) is a straight side, and the straight side is perpendicular to the radius of the inner circle of the intermediate plate passing through the midpoint of the straight side.

5. The intake structure according to claim 1, characterized in that, The projection of the outlet cross-section of the lower suction air flow passage (8) of the upper cylinder (7) coincides with the inlet cross-section of the suction port (2) of the lower cylinder (1).

6. The intake structure according to claim 1, characterized in that, Except for the side close to the inner circle of the intermediate plate (3), the other sides of the suction through-flow hole (6) of the intermediate plate (3) coincide with the projection of the outlet cross-section of the lower suction air flow passage (8) of the upper cylinder (7).

7. The intake structure according to claim 1, characterized in that, Except for the side close to the inner circle of the intermediate plate (3), the projection of the other sides of the suction through-flow hole (6) of the intermediate plate (3) coincides with the inlet cross-section of the suction port (2) of the lower cylinder (1).

8. The intake structure according to claim 1, characterized in that, The included angle α satisfies 45°≤α≤75°.

9. A compressor, characterized in that, It includes the suction structure according to any one of claims 1-8.

10. The compressor according to claim 9, characterized in that, The compressor is a rolling piston compressor.

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