Compressor cylinder, pump body assembly and compressor

Abstract

The compressor air cylinder is provided with a cylinder body, a compression cavity is formed in the inner side of the cylinder body, a first convex lug is arranged on the peripheral face of the cylinder body, and the first convex lug is provided with a first end and a second end which are opposite to each other in the circumferential direction of the cylinder body; the end face of the first end and the end face of the second end are both positioning faces, and the positioning faces are used for being matched with an external first positioning structure to position the compressor air cylinder when the pump body is centered. In order to solve the problem that in the prior art, a silencer shields a positioning pin hole in an air cylinder, the positioning faces are arranged at the two ends of the first protruding lug of the compressor air cylinder in the circumferential direction, so that positioning through the positioning pin hole in the prior art can be replaced, and the pin breaking accident caused when a trimming pin is adopted for positioning a pump body is avoided. In addition, a positioning groove such as an I-shaped groove is arranged on the rotor, so that the problem of insufficient height of the existing balance block is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to compressor technical field, concretely relates to a compressor cylinder, pump body subassembly and compressor. BACKGROUND

[0002] The cylinder of the micro compressor is provided with a positioning pin hole, when the pump body of the micro compressor is combined, the external pin needs to pass through the positioning pin hole on the cylinder to position the pump body of the micro compressor. The positioning pin holes of the upper and lower cylinders need to be passed through to make the pump body not deviate. The part size of the micro compressor is small, the micro compressor has a silencer, the silencer is easy to cover the positioning pin hole on the cylinder after assembly, the pin is interfered with the silencer when passing through and cannot pass through, if the edge cutting pin is used to avoid the silencer, the pin hole size is originally small, and the edge cutting pin is easy to break, therefore, the problem needs to be solved. SUMMARY

[0003] Therefore, the utility model provides a compressor cylinder, pump body subassembly and compressor can solve the technical problem that the edge cutting pin is used to position the pump body when the pump body is combined in the prior art and is easy to break.

[0004] In order to solve the above problem, the utility model provides a compressor cylinder, the compressor cylinder has cylinder body, the inside of cylinder body has compression cavity, the outer peripheral surface of cylinder body is equipped with first lug, the first lug has opposite first end and second end in the circumference of cylinder body;

[0005] Among them, the end face of both the first end and the second end is a positioning face, and the positioning face is used to cooperate with the external first positioning structure to position the compressor cylinder when the pump body is combined.

[0006] In some embodiments, the outer peripheral surface of the cylinder body is further provided with a second lug, and in a cross section perpendicular to the axis of the compressor cylinder, the outer peripheral surfaces of the first lug and the second lug are both arc surfaces, and the central angle of the outer peripheral surface of the second lug is greater than the central angle of the outer peripheral surface of the first lug. The second lug is provided with a sliding vane groove penetrating both ends along the axial direction of the cylinder body, and the outer peripheral surface of the second lug is provided with a spring hole communicating with the sliding vane groove.

[0007] The utility model also provides a pump body subassembly, which comprises the above-mentioned compressor cylinder.

[0008] In some embodiments, the number of the compressor cylinders is two, and the two compressor cylinders are a first cylinder and a second cylinder respectively; the first cylinder and the second cylinder are arranged in sequence along the axial direction of the pump body assembly, and an intermediate partition plate is arranged between the first cylinder and the second cylinder; the intermediate partition plate is provided with a suction hole, and the suction hole communicates the suction cavities of the first cylinder and the second cylinder; wherein,

[0009] One of the first cylinder and the second cylinder is provided with a suction hole, and the cylinder provided with the suction hole is an A cylinder, and the other is a B cylinder; the outer diameter of the A cylinder is D1, the outer diameter of the B cylinder is D2, and 0.3mm≤D1-D2≤0.6mm; and / or, the cylinder heights of the first cylinder and the second cylinder are equal.

[0010] The utility model also provides a kind of compressor, it includes the compressor cylinder of the compressor;Or including the pump body assembly of the compressor;

[0011] Wherein, the compressor further includes crankshaft and rotor fixed on crankshaft, the rotor and the compressor cylinder are sequentially arranged along the axial direction of the crankshaft;The rotor is provided with positioning slot, and the positioning slot is used to cooperate with external second positioning structure to position the rotor when the rotor is magnetized.

[0012] In some embodiments, the rotor has an inner hole, the rotor is fixed on the crankshaft through the inner hole, the inner hole has a first hole section forming the positioning slot, and the first hole section is located on the side of the inner hole away from the compressor cylinder.

[0013] In some embodiments, the positioning slot is an I-shaped slot;Wherein,

[0014] The depth h of the I-shaped slot satisfies: 4mm

[0015] And / or, the width B of the I-shaped slot satisfies: B>15mm;

[0016] And / or, the side of the rotor away from the compressor cylinder is provided with a rotor baffle, the rotor baffle is provided with a through hole, the projection of the I-shaped slot along the axial direction of the rotor is located in the through hole, and the diameter of the circular segment of the I-shaped slot is 1-2mm smaller than the diameter of the through hole.

[0017] In some embodiments, the side of the rotor away from the compressor cylinder is provided with a rotor baffle, and the positioning slot is arranged on the rotor baffle.

[0018] In some embodiments, the long axis section of the crankshaft has no stepped shaft structure.

[0019] In some embodiments, the long shaft section and the short shaft section of the crankshaft each has a diameter d, wherein 9mm < d < 10mm.

[0020] The compressor cylinder, the pump body assembly and the compressor provided by the utility model have the following beneficial effects:

[0021] 1. In view of the problem of the positioning pin hole on the silencer shielding the cylinder in the prior art, the utility model sets the positioning surface on the two ends of the circumference of the first lug of the compressor cylinder, so that the positioning pin hole positioning in the prior art is replaced, and the breakage of the edge pin for positioning the pump body is avoided.

[0022] 2. In view of the problem that the balance block height of the micro double-cylinder compressor is too small and is insufficient for rotor magnetization positioning, the utility model sets the positioning groove such as the I-shaped groove on the rotor, so that the space on the rotor is fully utilized, and the problem of insufficient balance block height in the prior art is solved.

[0023] 3. The utility model cancels the traditional D-shaped crankshaft fixed rotor mode and uses the internal heating rotor mode, so that the long shaft section of the crankshaft cancels the stepped shaft structure and is changed into a full-section through shaft, and the machining difficulty of the crankshaft is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other embodiments can be derived from the provided drawings without creative labor.

[0025] Figure 1 It is a structural schematic view of a compressor cylinder provided by an embodiment of the utility model;

[0026] Figure 2 It is a structural schematic view of another view of the compressor cylinder in the utility model; Figure 1

[0027] Figure 3 It is a structural schematic view of a pump body core combining mechanism when the pump body assembly is combined in an embodiment of the utility model;

[0028] Figure 4 It is a top view of the structure in the utility model; Figure 3

[0029] Figure 5 It is an assembly schematic view of a pump body assembly and a rotor provided by an embodiment of the utility model;

[0030] Figure 6 ​​is an embodiment of the utility model provides a kind of structure schematic diagram of compressor.

[0031] Figure 7 is an embodiment of the utility model provides a kind of structure schematic diagram of rotor.

[0032] Figure 8 is Figure 7 sectional view of rotor.

[0033] Figure 9 is an embodiment of the utility model provides a kind of structure schematic diagram of rotor baffle.

[0034] Figure 10 is an embodiment of the utility model provides a kind of structure schematic diagram of crankshaft.

[0035] Reference signs are:

[0036] 1, crankshaft;2, first flange;3, compressor cylinder;4, intermediate partition;6, second flange;71, first roller;72, second roller;8, rotor;12, first eccentric portion;13, second eccentric portion;14, bottom plate;15, positioning plate;16, positioning block;17, clamping jaw;18, rotary tool;19, rotor baffle;81, positioning groove;31, cylinder body;32, first lug;33, second lug;101, long shaft section;102, short shaft section;161, clamping groove;191, via hole;200, pump body assembly;300, compression chamber;301, first cylinder;302, second cylinder;321, first end;322, second end;331, sliding vane groove;332, spring hole;333, suction hole;334, exhaust groove. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0038] In the description of the utility model, it is understood that the orientation words such as "front, back, top, bottom, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore it can not be understood as the limitation of the protection scope of the utility model;The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0039] For the convenience of description, spatial relative terms can be used here, such as "on", "above", "upper surface", "upper", and the like, to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0040] In addition, it should be noted that the use of "first", "second" and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore can not be understood as limiting the protection scope of the utility model.

[0041] For reference Figures 1-2 As shown in the drawing, according to the embodiment of the utility model, a compressor cylinder 3 is provided, the compressor cylinder 3 has a cylinder body 31, and the inner side of the cylinder body 31 has a compression chamber 300. A first lug 32 is arranged on the outer peripheral surface of the cylinder body 31. The first lug 32 has opposite first and second ends 321 and 322 in the circumferential direction of the cylinder body 31. The end faces of both the first and second ends 321 and 322 are positioning faces, which are used to cooperate with external first positioning structures to position the compressor cylinder 3 when the pump body is centered.

[0042] In the above example, in order to solve the problem of the muffler shielding the positioning pin hole on the cylinder in the prior art, the utility model sets the positioning face on both ends of the first lug 32 of the compressor cylinder 3 in the circumferential direction, which can replace the positioning pin hole positioning in the prior art, and avoids the breakage of the edge pin when the pump body is positioned.

[0043] When the pump body with the compressor cylinder 3 is assembled, as shown in Figures 3-4 , the pump body assembling mechanism includes a base plate 14 and a positioning plate 15, and the positioning plate 15 is fixed on the base plate 14 by two pins. The positioning plate 15 is provided with a positioning block 16, and the external first positioning structure includes a clamping groove 161 provided on the positioning block 16, and the positioning block 16 clamps and fixes the positioning surface on both sides of the first lug 32 through the clamping groove 161 to realize the positioning of the pump body. The pump body assembling mechanism further includes a rotating tool 18, and the rotating tool 18 is provided with three clamping jaws 17, and the three clamping jaws 17 clamp the crankshaft 1, and then the rotating tool 18 platform drives the crankshaft 1 to rotate to complete the assembly of the pump body.

[0044] It should be noted that: the end faces of the first end 321 and the second end 322 can both be flat, and both are rough-milled to improve the positioning accuracy.

[0045] In some embodiments, as shown in Figures 1-2 , the number of the first lug 32 can be two, and the two first lugs 32 are arranged at intervals in the circumferential direction of the compressor cylinder 3. More first lugs 32 can improve the assembly accuracy of the pump body.

[0046] In some embodiments, as shown in Figures 1-2 , the outer periphery of the cylinder body 31 is further provided with a second lug 33, and in the cross section perpendicular to the axis of the compressor cylinder 3, the outer periphery of the first lug 32 and the second lug 33 are both arc surfaces, and the central angle a1 of the outer periphery of the second lug is greater than the central angle a2 of the outer periphery of the first lug, that is, the second lug 33 is a large lug, and the first lug 32 is a small lug. The second lug 33 is provided with a sliding vane groove 331 penetrating through both ends in the axial direction of the cylinder body 31, and the outer periphery of the second lug 33 is provided with a spring hole 332 communicating with the sliding vane groove 331.

[0047] The inner wall of the compression chamber 300 is further provided with an exhaust groove 334, which can be crescent-shaped, and the exhaust groove 334 can be provided on the second lug 33.

[0048] It should be noted that: the first lug 32 and the second lug 33 are further used for welding with the shell of the compressor to fix the compressor cylinder 3 and the shell.

[0049] In the above example, by arranging the sliding vane groove 331 and the spring hole 332, etc. on the second lug 33 as a large lug, the structural strength of the compressor cylinder 3 can be ensured.

[0050] In some embodiments, as shown in Figure 5As shown, the utility model still provides a pump body assembly 200, it can include above-mentioned compressor cylinder 3. Among them, because pump body assembly 200 adopts above-mentioned compressor cylinder 3, aiming at the problem of silencer shielding locating pin hole on cylinder in prior art, the utility model is positioned by setting locating surface on both ends of the circumference of the first lug 32 of the compressor cylinder 3, so it can replace the positioning of the locating pin hole in the prior art, and avoid the breakage of the positioning pin when using the edge cutting pin to position the pump body.

[0051] In some embodiments, as shown, Figure 5 As shown, the number of the aforementioned compressor cylinder 3 is two, and they are respectively a first cylinder 301 and a second cylinder 302, so that the pump body assembly 200 is a double-cylinder structure. The first cylinder 301 and the second cylinder 302 are arranged in sequence along the axial direction of the pump body assembly 200, and an intermediate partition plate 4 is arranged between the first cylinder 301 and the second cylinder 302. The intermediate partition plate 4 is provided with an air suction through hole, and the air suction through hole communicates with the air suction cavities of the first cylinder 301 and the second cylinder 302. Among them, one of the first cylinder 301 and the second cylinder 302 is provided with an air suction hole 333, so that the pump body assembly 200 is a single air suction structure.

[0052] The cylinder provided with the air suction hole 333 among the aforementioned first cylinder 301 and the second cylinder 302 is an A cylinder, and the other is a B cylinder. As shown, Figure 10 As shown, the outer diameter of the A cylinder is D1, the outer diameter of the B cylinder is D2, 0.3mm≤D1-D2≤0.6mm, so that when the pump body assembly 200 is assembled to the shell, the B cylinder can be gap-fitted with the inner wall of the shell, thereby facilitating the improvement of assembly efficiency.

[0053] Among them, when the outer peripheral surface of the cylinder body 31 is further provided with a second lug 33, the air suction hole 333 on the aforementioned A cylinder can be arranged on the second lug 33 of the A cylinder, so as to facilitate the guarantee of the structural strength of the A cylinder. The air suction hole 333 on the A cylinder penetrates the outer peripheral surface of the second lug 33 and is communicated with the distributor through the shell air suction hole.

[0054] In some embodiments, the cylinder heights of the aforementioned first cylinder 301 and the second cylinder 302 can be equal.

[0055] As shown, Figure 6 The utility model still provides a compressor, it can include above-mentioned compressor cylinder 3, or include above-mentioned pump body assembly 200. Among them, because the compressor adopts above-mentioned compressor cylinder 3 or pump body assembly 200, aiming at the problem of silencer shielding locating pin hole on cylinder in prior art, the utility model is positioned by setting locating surface on both ends of the circumference of the first lug 32 of the compressor cylinder 3, so it can replace the positioning of the locating pin hole in the prior art, and avoid the breakage of the positioning pin when using the edge cutting pin to position the pump body.

[0056] In some embodiments, the compressor described above can be a micro double-cylinder compressor.

[0057] In some embodiments, as shown in Figures 5-6 the aforementioned compressor further comprises a crankshaft 1 and a rotor 8 sleeved on the crankshaft 1, the rotor 8 and the compressor cylinder 3 are arranged in sequence along the axial direction of the crankshaft 1. The rotor 8 is provided with a positioning groove 81, and the positioning groove 81 is used for positioning the rotor 8 when the rotor 8 is magnetized by cooperating with an external second positioning structure.

[0058] In view of the problem that the balance block height of the micro double-cylinder compressor is too small and is not sufficient for positioning the rotor 8 during magnetization, in the above example, the positioning groove 81 such as an I-shaped groove is arranged on the rotor 8, so that the space on the rotor 8 can be fully utilized, thereby solving the problem of insufficient height of the existing balance block.

[0059] In some embodiments, the aforementioned positioning groove 81 can also be used as a positioning magnetic pole direction.

[0060] The aforementioned positioning groove 81 has two different arrangement modes, which will be described one by one below.

[0061] In a first example, as shown in Figures 5-8 the aforementioned rotor 8 has an inner hole 80, the rotor 8 is sleeved on the crankshaft 1 through the inner hole 80, and the inner hole 80 has a first hole section forming the aforementioned positioning groove 81, and the first hole section is located on the side of the inner hole 80 away from the compressor cylinder 3. In this first example, by arranging the positioning groove 81 on the inner hole 80, the space of the inner hole 80 can be fully utilized, thereby improving the space utilization rate.

[0062] In some embodiments, the aforementioned positioning groove 81 can be an I-shaped groove, which is easy to process.

[0063] In some embodiments, as shown in Figure 8 the depth h of the I-shaped groove satisfies: 4mm < h < 6mm. h > 4mm is because the I-shaped groove with too small height cannot play a limiting role, and h < 6mm is because the I-shaped groove with too large height is easy to have high iron loss, thereby reducing the motor efficiency.

[0064] As shown in Figure 7 the width B of the aforementioned I-shaped groove satisfies: B > 15mm. If B < 15mm, the width of the rotor 8 hot-fitting positioning surface is too small. By making the width B of the I-shaped groove greater than 15mm, the contact area during hot-fitting can be increased.

[0065] As shown in Figure 7As shown, the side of the aforementioned rotor 8 away from the compressor cylinder 3 is provided with a rotor baffle 19, and the rotor baffle 19 is provided with a through hole 191, and the projection of the I-shaped groove along the axial direction of the rotor 8 is located in the through hole 191, so as to facilitate the external positioning structure to insert the I-shaped groove to position the rotor 8, and avoid interference with the rotor baffle 19. In a specific application example, the diameter D of the circular arc segment of the I-shaped groove is 1-2 mm smaller than the diameter D0 of the through hole 191.

[0066] In a second example, as shown in the drawings, Figure 9 The side of the rotor 8 away from the compressor cylinder 3 is provided with a rotor baffle 19, and the aforementioned positioning groove 81 is arranged on the rotor baffle 19.

[0067] In this second example, the rotor baffle 19 can be thickened, and the aforementioned positioning groove 81 can be a notch arranged on the rotor baffle 19, so that the purpose of positioning during magnetization of the rotor 8 can also be achieved. The notch can be square, and the number of notches can be two, and the two notches are different in size to facilitate the prevention of mistakes.

[0068] In some embodiments, as shown in the drawings, Figure 10 The long shaft segment 101 of the crankshaft 1 has no stepped shaft structure. In this example, the long shaft segment 101 of the crankshaft 1 cancels the stepped shaft structure, and the long shaft segment 101 of the crankshaft 1 is changed to a full-section through shaft, which reduces the machining difficulty of the crankshaft 1 and improves the assembly efficiency of the whole machine.

[0069] The utility model discloses a rotor 8 and crankshaft 1 can be combined by internal heating, and the traditional assembly mode of locking screw fixing rotor 8 on the crankshaft 1 is cancelled to improve the strength of the crankshaft 1.

[0070] In a specific application example, as shown in the drawings, Figure 10 The diameter of the long shaft segment 101 and the short shaft segment 102 of the crankshaft 1 can be d. 9mm < d < 10mm.

[0071] As shown in the drawings, Figure 6 When the number of the aforementioned compressor cylinder 3 is two, and the two compressor cylinders are a first cylinder 301 and a second cylinder 302, the crankshaft 1 is provided with a first eccentric part 12 and a second eccentric part 13 along the axial direction thereof, and the eccentric amount of the first eccentric part 12 and the second eccentric part 13 is equal. The first eccentric part 12 is sleeved with a first roller 71, and the second eccentric part 13 is sleeved with a second roller 72. The first roller 71 is located in the compression chamber of the first cylinder 301, and the second roller 72 is located in the compression chamber of the second cylinder 302. The first roller 71 and the second roller 72 rotate eccentrically in the corresponding compression chamber 300.

[0072] The foregoing compressor further comprises a first flange 2 and a second flange 6, the first flange 2 is located on the side of the first cylinder 301 away from the second cylinder 302, and the second flange 6 is located on the side of the second cylinder 302 away from the first cylinder 301. The first flange 2 can be an upper flange, and the second flange 6 can be a lower flange.

[0073] For the convenience of understanding, the overall structure of the utility model is described below, and the working principle is described.

[0074] The parts of the existing micro compressor are small in size and high in precision, especially the stepped crankshaft 1 is difficult to process, and the height of the balance block of the micro double-cylinder compressor is too small to be used for magnetizing positioning of the rotor 8, in addition, there is a problem of the silencer shielding the cylinder positioning pin hole, and the traditional one-face two-pin positioning mode cannot be used for the pump body. The above problems need to be solved in the development of the micro double-cylinder compressor. The utility model cancels the traditional D-shaped crankshaft 1 fixed rotor 8 mode and uses the internal heating rotor 8 mode, so that the long shaft section 101 of the crankshaft 1 cancels the stepped shaft structure and is changed into a full-section through shaft, thereby reducing the machining difficulty of the crankshaft 1; in view of the problem of insufficient positioning height of the magnetizing positioning balance block, the utility model sets a I-shaped groove on the rotor 8 for magnetizing positioning; in view of the problem of the silencer shielding the cylinder positioning pin hole, the two end planes in the circumferential direction of the first lug 32 on the cylinder are used instead of the pin hole positioning.

[0075] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0076] The above is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model. The above is only a preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the utility model, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the utility model.

Claims

1. A compressor cylinder (3) characterized by: The compressor cylinder (3) has a cylinder body (31), the inner side of the cylinder body (31) has a compression cavity (300), the outer peripheral surface of the cylinder body (31) is provided with a first lug (32), the first lug (32) has opposite first and second ends (321) and (322) in the circumferential direction of the cylinder body (31); Wherein, the end faces of the first end (321) and the second end (322) are both positioning faces, and the positioning faces are used for cooperating with external first positioning structures to position the compressor cylinder (3) when the pump body is centered.

2. The compressor cylinder (3) according to claim 1, characterized in that: The outer peripheral surface of the cylinder body (31) is further provided with a second lug (33); in a cross section perpendicular to the axis of the compressor cylinder (3), the outer peripheral surfaces of the first lug (32) and the second lug (33) are both arc surfaces, and the central angle (a1) of the outer peripheral surface of the second lug is greater than the central angle (a2) of the outer peripheral surface of the first lug; the second lug (33) is provided with a sliding vane groove (331) penetrating through both ends in the axial direction of the cylinder body (31), and the outer peripheral surface of the second lug (33) is provided with a spring hole (332) communicating with the sliding vane groove (331).

3. A pump body assembly (200) characterized by: The compressor cylinder (3) according to claim 1 or 2.

4. The pump body assembly (200) according to claim 3, characterized in that: The number of the compressor cylinders (3) is two, and they are respectively a first cylinder (301) and a second cylinder (302); the first cylinder (301) and the second cylinder (302) are arranged in sequence in the axial direction of the pump body assembly (200), and an intermediate partition plate (4) is arranged between the first cylinder (301) and the second cylinder (302); the intermediate partition plate (4) is provided with an air suction through hole, and the air suction through hole communicates with the air suction cavities of the first cylinder (301) and the second cylinder (302); wherein, One of the first cylinder (301) and the second cylinder (302) is provided with an air suction hole (333), and the cylinder provided with the air suction hole (333) is an A cylinder, and the other is a B cylinder, the outer diameter of the A cylinder is D1, the outer diameter of the B cylinder is D2, 0.3mm≤D1-D2≤0.6mm; and / or, the cylinder heights of the first cylinder (301) and the second cylinder (302) are equal.

5. A compressor characterized by: The compressor cylinder (3) according to claim 1 or 2; or the pump body assembly (200) according to claim 3 or 4; Wherein, the compressor further comprises a crankshaft (1) and a rotor (8) sleeved on the crankshaft (1), the rotor (8) and the compressor cylinder (3) are arranged in sequence in the axial direction of the crankshaft (1); the rotor (8) is provided with a positioning groove (81), and the positioning groove (81) is used for cooperating with external second positioning structures to position the rotor (8) when the rotor (8) is magnetized.

6. The compressor according to claim 5, characterized in that: The rotor (8) has an inner hole (80) through which the rotor (8) is sleeved on the crankshaft (1), and the inner hole (80) has a first hole section forming the positioning groove (81), and the first hole section is located on a side of the inner hole (80) away from the compressor cylinder (3).

7. The compressor of claim 5 or 6, characterized in that: The positioning groove (81) is an I-shaped groove; wherein, The depth h of the I-shaped groove satisfies: 4mm < h < 6mm; And / or, the width B of the I-shaped groove satisfies: B > 15mm; And / or, a rotor baffle (19) is arranged on a side of the rotor (8) away from the compressor cylinder (3), and a through hole (191) is arranged on the rotor baffle (19), a projection of the I-shaped groove along an axial direction of the rotor (8) is located in the through hole (191), and a diameter D of an arc section of the I-shaped groove is 1-2mm smaller than a diameter D0 of the through hole.

8. The compressor according to claim 5, wherein: A rotor baffle (19) is arranged on a side of the rotor (8) away from the compressor cylinder (3), and the positioning groove (81) is arranged on the rotor baffle (19).

9. The compressor according to claim 5, wherein: The long shaft section (101) of the crankshaft (1) has no stepped shaft structure.

10. The compressor according to any one of claims 5-6, 8-9, wherein: The long shaft section (101) and the short shaft section (102) of the crankshaft have a diameter d, and 9mm < d < 10mm.

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