A bidirectional lubrication structure and compressor

Abstract

The present invention discloses a bidirectional lubrication structure and a compressor, and belongs to the technical field of compressors. The present invention comprises a first rotating shaft, an upper oil pump, a second rotating shaft and a lower oil pump connected in sequence in a vertical direction, a compression mechanism is provided between the upper oil pump and the lower oil pump, and the second rotating shaft passes through the compression mechanism. An upper gear pump is provided in the upper oil pump, and a lower gear pump is provided in the lower oil pump, and the structures of the upper gear pump and the lower gear pump are exactly the same. The first rotating shaft can drive the second rotating shaft to rotate, and the second rotating shaft can rotate in a first direction or a second direction, and the first direction is opposite to the second direction. When the second rotating shaft rotates in the first direction or the second direction, the upper gear pump and the lower gear pump drive the lubricating oil to flow from top to bottom or from bottom to top. By arranging the upper oil pump and the lower oil pump, the present invention can lubricate the second rotating shaft well regardless of whether the second rotating shaft rotates forward or reversely.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a bidirectional lubrication structure and a compressor. Background Art

[0002] The existing heating / cooling system is composed of a compressor, an expansion valve, an outdoor exchanger, an indoor exchanger and a four-way valve. The compressor is used to compress the refrigerant, and the four-way valve is used to change the flow direction of the refrigerant. The compressor is provided with a rotating shaft and a compression mechanism. Usually, the rotating shaft only rotates in one direction to drive the compression mechanism to work, and the four-way valve changes the flow direction of the refrigerant to achieve cooling or heating.

[0003] In order to reduce the size of the compressor, some companies have developed compressors that can rotate forward and reverse without using a four-way valve. However, the two-way lubrication effect of the rotating shaft of the compressor that can rotate forward and reverse is poor, and the lubricating oil easily flows back into the compression mechanism, affecting the normal operation of the compression mechanism. Summary of the invention

[0004] In view of the above-mentioned shortcomings, the present invention provides a two-way lubrication structure and a compressor, wherein the two-way lubrication structure can lubricate the rotating shaft well and prevent the lubricating oil from flowing back into the compression mechanism.

[0005] The first aspect of the present invention protects a bidirectional lubrication structure, which includes a first rotating shaft, an upper oil pump, a second rotating shaft and a lower oil pump connected in sequence in a vertical direction, a compression mechanism is provided between the upper oil pump and the lower oil pump, and the second rotating shaft passes through the compression mechanism;

[0006] An upper gear pump is provided in the upper oil pump, and a lower gear pump is provided in the lower oil pump, and the structures of the upper gear pump and the lower gear pump are completely the same;

[0007] The first rotating shaft can drive the second rotating shaft to rotate, and the second rotating shaft can rotate in a first direction or a second direction, the first direction is opposite to the second direction, and when the second rotating shaft rotates in the first direction or the second direction, the upper gear pump and the lower gear pump drive the lubricating oil to flow from top to bottom or from bottom to top.

[0008] Further, the upper gear pump comprises an outer rotor, an inner rotor is arranged inside the outer rotor, and the inner rotor can move along the inner wall of the outer rotor;

[0009] The inner rotor is provided with a D-shaped rotor hole.

[0010] Furthermore, the first rotating shaft includes a first shaft body, a first lower protrusion is provided at the bottom of the first shaft body, and the first lower protrusion can be inserted into the rotor hole.

[0011] Furthermore, the second rotating shaft comprises a second shaft body, and an upper protrusion is provided at the top end of the second shaft body, and the upper protrusion can be inserted into the rotor hole;

[0012] The first lower protrusion and the upper protrusion can be completely matched with the rotor hole after being combined.

[0013] Furthermore, a hollow cavity is provided inside the second shaft body;

[0014] A groove is provided on the side wall surface of the second shaft body, a groove hole is provided in the groove, and the groove hole is communicated with the hollow cavity;

[0015] A second lower protrusion is disposed at the bottom end of the second shaft.

[0016] Further, the upper oil pump comprises a first housing, the first housing is provided with a first through hole, a first shaft hole and a first oil hole, the bottom surface of the first housing is provided with a first receiving groove, and the upper gear pump is arranged in the first receiving groove;

[0017] The first shaft hole and the first oil hole are both communicated with the first accommodating groove.

[0018] Furthermore, the lower oil pump comprises a second shell, a top surface of the second shell is provided with a second accommodating groove, and a bottom wall of the second accommodating groove is provided with a second through hole.

[0019] Furthermore, a top plate is provided between the oil supply pump and the compression mechanism;

[0020] The top plate is provided with a top plate shaft hole, a top plate through hole, a top plate side groove and an oil groove. The top plate side groove is arranged on the upper surface of the top plate and is adjacent to the top plate shaft hole.

[0021] Furthermore, a bottom plate is provided between the compression mechanism and the lower oil pump;

[0022] The bottom plate is provided with a bottom plate shaft hole, a bottom plate through hole and a bottom plate side groove, and the bottom plate side groove is arranged on the lower surface of the bottom plate and is adjacent to the bottom plate shaft hole.

[0023] A second aspect of the present invention protects a compressor comprising the above-mentioned bidirectional lubrication structure.

[0024] Beneficial effect: The present invention provides an upper oil pump and a lower oil pump, and can drive the upper gear pump and the lower gear pump to rotate regardless of whether the second rotating shaft rotates forward or reversely, so that the lubricating oil can move upward or downward, and the second rotating shaft can be well lubricated. By providing an upper oil pump above the compression mechanism, when the lubricating oil flows from top to bottom, the upper oil pump can block the lubricating oil from entering the compression mechanism, thereby preventing the lubricating oil from affecting the compression mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] in:

[0027] Figure 1 A longitudinal sectional view of a compressor in one embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of an upper gear pump in one embodiment of the present invention;

[0029] Figure 3 It is a schematic structural diagram of a first rotating shaft in one embodiment of the present invention;

[0030] Figure 4 A bottom view of a first rotating shaft in one embodiment of the present invention;

[0031] Figure 5 It is a schematic structural diagram of a second rotating shaft in one embodiment of the present invention;

[0032] Figure 6 is a top view of a second rotating shaft in one embodiment of the present invention;

[0033] Figure 7 A bottom view of a second rotating shaft in one embodiment of the present invention;

[0034] Figure 8 A top view of an oil pump in one embodiment of the present invention;

[0035] Fig. 9 for Figure 8 Cross-section view in the AA direction;

[0036] Fig.10 A top view of a lower oil pump in one embodiment of the present invention;

[0037] Fig.11 for Fig.10 Cross-section view in BB direction;

[0038] Fig.12 A bottom view of a lower oil pump in one embodiment of the present invention;

[0039] Fig.13 A top view of a top plate in one embodiment of the present invention;

[0040] Fig.14 for Fig.13 Cross-section in CC direction;

[0041] Fig.15 A top view of an oil pump in one embodiment of the present invention;

[0042] Fig.16 for Fig.15 Cross-section in DD direction;

[0043] In the figure, 1, first rotating shaft; 11, first shaft body; 12, first lower protrusion; 2, upper oil pump; 21, first housing; 22, first through hole; 23, first shaft hole; 24, first oil hole; 25, first accommodating groove; 26, outer rotor; 27, rotor hole; 28, inner rotor; 3, top plate; 31, top plate shaft hole; 32, top plate through hole; 33, top plate side groove; 34, oil groove; 4, compression mechanism; 5, bottom plate; 51, bottom plate shaft hole; 52, bottom plate through hole; 53, bottom plate side groove; 6, lower oil pump; 61, second housing; 62, second accommodating groove; 63, second through hole; 7, second rotating shaft; 71, second shaft body; 72, hollow cavity; 73, second lower protrusion; 74, groove; 75, groove hole; 76, upper protrusion. DETAILED DESCRIPTION

[0044] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] refer to Figure 1 to Figure 16 The first aspect of the present invention protects a bidirectional lubrication structure, which includes a first rotating shaft 1, an upper oil pump 2, a second rotating shaft 7 and a lower oil pump 6 connected in sequence in a vertical direction, a compression mechanism 4 is arranged between the upper oil pump 2 and the lower oil pump 6, and the second rotating shaft 7 passes through the compression mechanism 4. The compression mechanism 4 is a conventional structure in a compressor and will not be described in detail here.

[0046] An upper gear pump is provided in the upper oil pump 2, and a lower gear pump is provided in the lower oil pump 6. The structures of the upper gear pump and the lower gear pump are exactly the same. The structure of the gear pump can be selected from existing structures, such as a gear pump with application number CN107923390A or a gear pump similar to the application number. Different rotation directions of the inner rotor in the gear pump will cause different vertical flow directions of the lubricating oil.

[0047] The first rotating shaft 1 can drive the second rotating shaft 7 to rotate, and the second rotating shaft 7 can rotate in a first direction or a second direction, the first direction is opposite to the second direction, and when the second rotating shaft 7 rotates in the first direction or the second direction, the upper gear pump and the lower gear pump drive the lubricating oil to flow from top to bottom or from bottom to top.

[0048] The present invention provides an upper oil pump 2 and a lower oil pump 6, and can drive the upper gear pump and the lower gear pump to rotate regardless of whether the second rotating shaft 7 rotates forward or reversely, so that the lubricating oil can move upward or downward, and can well lubricate the second rotating shaft 7. By providing the upper oil pump 2 above the compression mechanism 4, when the lubricating oil flows from top to bottom, the upper oil pump 2 can block the lubricating oil from entering the compression mechanism 4, thereby preventing the lubricating oil from affecting the compression mechanism.

[0049] refer to Figure 2 In a specific embodiment, the upper gear pump includes an outer rotor 26 , an inner rotor 28 is disposed inside the outer rotor 26 , and the inner rotor 28 can move along the inner wall of the outer rotor 26 ; a D-shaped rotor hole 27 is disposed on the inner rotor 28 .

[0050] By providing the D-shaped hole, the first rotating shaft 1 or the second rotating shaft 7 is stable after being connected to the rotor hole 27 .

[0051] refer to Figure 3 and 4 In a specific embodiment, the first rotating shaft 1 includes a first shaft body 11 , a first lower protrusion 12 is provided at the bottom of the first shaft body 11 , and the first lower protrusion 12 can be inserted into the rotor hole 27 .

[0052] The volume of the first lower protrusion 12 is exactly half of the volume of the rotor hole 27, and the shape is half of a D-shaped hole, and the remaining space is left for the connection structure of the second shaft 7 to fill. The purpose of this design is to reduce the volume of the gear pump, and then reduce the volume of the entire lubrication structure.

[0053] refer to Figures 5 to 7 In a specific embodiment, the second rotating shaft 7 includes a second shaft body 71, and an upper protrusion 76 is provided at the top of the second shaft body 71, and the upper protrusion 76 can be inserted into the rotor hole 27. The shape of the upper protrusion 76 is the same as that of the first lower protrusion 12, and the two are completely matched with the rotor hole 27 after being inserted into the rotor hole 27 from the top and the bottom respectively.

[0054] The first lower protrusion 12 and the upper protrusion 76 can be completely matched with the rotor hole 27 after being combined.

[0055] In this embodiment, the upper protrusion 76 is arranged to cooperate with the first lower protrusion 12 to be inserted into the rotor hole 27, so as to reduce the volume of the entire lubrication structure and thus reduce the volume of the compressor.

[0056] refer to Figure 5 In a specific embodiment, a hollow cavity 72 is provided inside the second shaft body 71; a groove 74 is provided on the side wall surface of the second shaft body 71, a groove hole 75 is provided in the groove 74, and the groove hole 75 is connected to the hollow cavity 72; a second lower protrusion 73 is provided at the bottom end of the second shaft body 71.

[0057] The groove 74 in this embodiment is an annular groove, which is provided with two grooves, one near the top and the other near the bottom. In this way, the external lubricating oil can enter the hollow cavity 72 through the groove 74 and the groove hole 75 in sequence. The internal lubricating oil can be discharged from the hollow cavity 72 through the groove hole 75 and the groove 74 in sequence. This solves the problem of poor bidirectional lubrication effect of the second rotating shaft 7, and can guide the lubricating oil to flow in a directional manner, solving the problem of lubricating oil accumulation on the compression mechanism 4.

[0058] refer to Figures 8 and 9 In a specific embodiment, the upper oil pump 2 includes a first housing 21, the first housing 21 is provided with a first through hole 22, a first shaft hole 23 and a first oil hole 24, the bottom surface of the first housing 21 is provided with a first receiving groove 25, and the upper gear pump is arranged in the first receiving groove 25;

[0059] The first shaft hole 23 and the first oil hole 24 are both communicated with the first receiving groove 25 .

[0060] In this embodiment, the first housing 21 is provided with an upper protrusion, and a first through hole 22 is provided in the upper protrusion, and refrigerant and lubricating oil can pass through the first through hole 22. The motor chamber is located above the upper oil pump 2, and the protrusion can prevent the lubricating oil from flowing into the compression mechanism below to a certain extent. The first oil hole 24 is a crescent hole.

[0061] refer to Figures 10-12 In a specific embodiment, the lower oil pump 6 includes a second housing 61 , a second receiving groove 62 is provided on the top surface of the second housing 61 , and a second through hole 63 is provided on the bottom wall of the second receiving groove 62 .

[0062] In this embodiment, a lower protrusion is provided below the second housing 61, and a second through hole 63 is provided in the lower protrusion. In this way, the lubricating oil at the bottom of the compressor can be sucked into the lower oil pump 6 through the lower protrusion. The second through hole 63 is also a crescent hole.

[0063] refer to Figures 13 and 14 , in a specific embodiment, a top plate 3 is provided between the oil pump 2 and the compression mechanism 4;

[0064] The top plate 3 is provided with a top plate shaft hole 31 , a top plate through hole 32 , a top plate side groove 33 and an oil groove 34 . The top plate side groove 33 is arranged on the upper surface of the top plate 3 and is adjacent to the top plate shaft hole 31 .

[0065] In this embodiment, the top plate 3 is provided to block the lubricating oil and further prevent the lubricating oil from entering the compression mechanism. The oil groove 34 can temporarily store the lubricating oil, which is convenient for the oil pump 2 to suck the lubricating oil. The top plate side groove 33 is provided on the top plate 3 adjacent to the top plate shaft hole 31, so that the top plate side groove 33 is close to each other, which helps the lubricating oil on the top plate 3 to enter the top plate shaft hole 31.

[0066] refer to Figures 15 and 16, in a specific embodiment, a bottom plate 5 is provided between the compression mechanism 4 and the lower oil pump 6;

[0067] The bottom plate 5 is provided with a bottom plate shaft hole 51 , a bottom plate through hole 52 and a bottom plate side groove 53 . The bottom plate side groove 53 is arranged on the lower surface of the bottom plate 5 and is adjacent to the bottom plate shaft hole 51 .

[0068] In this embodiment, a bottom plate side groove 53 is provided next to the bottom plate shaft hole 51 , so that lubricating oil can more easily enter the bottom plate shaft hole 51 from the bottom plate side groove 53 , thereby improving the lubrication effect.

[0069] A second aspect of the present invention protects a compressor comprising any of the above-mentioned bidirectional lubrication structures.

[0070] The compressor provided with the above-mentioned bidirectional lubrication structure has good bidirectional lubrication effect on the rotating shaft and can also prevent the lubricating oil from flowing back into the compression mechanism.

[0071] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A bidirectional lubrication structure, characterized in that: It comprises a first rotating shaft (1), an upper oil pump (2), a second rotating shaft (7) and a lower oil pump (6) which are connected in sequence in a vertical direction, a compression mechanism (4) is provided between the upper oil pump (2) and the lower oil pump (6), and the second rotating shaft (7) passes through the compression mechanism (4); An upper gear pump is provided in the upper oil pump (2), and a lower gear pump is provided in the lower oil pump (6), and the upper gear pump and the lower gear pump have completely the same structure; The first rotating shaft (1) can drive the second rotating shaft (7) to rotate, and the second rotating shaft (7) can rotate in a first direction or a second direction, the first direction being opposite to the second direction, and when the second rotating shaft (7) rotates in the first direction or the second direction, the upper gear pump and the lower gear pump drive the lubricating oil to flow from top to bottom or from bottom to top; The upper gear pump comprises an outer rotor (26), an inner rotor (28) is arranged inside the outer rotor (26), and the inner rotor (28) can move along the inner wall of the outer rotor (26); The inner rotor (28) is provided with a D-shaped rotor hole (27); The first rotating shaft (1) comprises a first shaft body (11), a first lower protrusion (12) being provided at the bottom of the first shaft body (11), and the first lower protrusion (12) being capable of being inserted into the rotor hole (27); The second rotating shaft (7) comprises a second shaft body (71), the top end of the second shaft body (71) is provided with an upper protrusion (76), and the upper protrusion (76) can be inserted into the rotor hole (27); The first lower protrusion (12) and the upper protrusion (76) can completely fit into the rotor hole (27) after being combined; A hollow cavity (72) is provided inside the second shaft body (71); A groove (74) is provided on the side wall surface of the second shaft body (71), a groove hole (75) is provided in the groove (74), and the groove hole (75) is communicated with the hollow cavity (72); A second lower protrusion (73) is provided at the bottom end of the second shaft body (71).

2. The bidirectional lubrication structure according to claim 1, characterized in that: The upper oil pump (2) comprises a first housing (21), the first housing (21) being provided with a first through hole (22), a first shaft hole (23) and a first oil hole (24), the bottom surface of the first housing (21) being provided with a first receiving groove (25), the upper gear pump being provided in the first receiving groove (25); The first shaft hole (23) and the first oil hole (24) are both in communication with the first containing groove (25).

3. The bidirectional lubrication structure according to claim 1, characterized in that: The lower oil pump (6) comprises a second housing (61), the top surface of the second housing (61) is provided with a second accommodating groove (62), and the bottom wall of the second accommodating groove (62) is provided with a second through hole (63).

4. The bidirectional lubrication structure according to claim 1, characterized in that: A top plate (3) is provided between the oil supply pump (2) and the compression mechanism (4); The top plate (3) is provided with a top plate shaft hole (31), a top plate through hole (32), a top plate side groove (33) and an oil groove (34); the top plate side groove (33) is arranged on the upper surface of the top plate (3) and is adjacent to the top plate shaft hole (31).

5. The bidirectional lubrication structure according to claim 1, characterized in that: A bottom plate (5) is provided between the compression mechanism (4) and the lower oil pump (6); The bottom plate (5) is provided with a bottom plate shaft hole (51), a bottom plate through hole (52) and a bottom plate side groove (53). The bottom plate side groove (53) is arranged on the lower surface of the bottom plate (5) and is adjacent to the bottom plate shaft hole (51).

6. A compressor having the bidirectional lubrication structure according to any one of claims 1 to 5.

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