An oil pump assembly, crankshaft, compressor and refrigeration equipment

Abstract

This invention provides an oil pump assembly, crankshaft, compressor, and refrigeration equipment, belonging to the field of compressor technology. It includes: a pump core with a first helical rib wound axially around its outer peripheral wall; and a helical pump sleeve, including a second helical rib wound around the outer peripheral wall of the pump core, with a helical oil groove formed between the first and second helical ribs and the outer peripheral wall of the pump core. One of the pump core and the helical pump sleeve can move axially relative to the other to change the groove spacing of the helical oil groove. When the compressor operates at low frequency, the first and second helical ribs are close to each other, resulting in the largest groove spacing of the helical oil groove and increasing the oil supply at low frequencies. When the compressor frequency increases, one of the pump core and the helical pump sleeve can move axially relative to the other under the action of lubricating oil, causing the first and second helical ribs to move further apart, narrowing the oil pumping channel, and reducing the oil supply of the compressor at high frequencies.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to an oil pump assembly, crankshaft, compressor and refrigeration equipment. Background Technology

[0002] When a refrigeration compressor is working, its oil pump mechanism is driven to rotate at high speed. This mechanism draws refrigerant oil from the oil sump in the lower casing of the compressor, achieving an "oil suction-pumping-slinging" process from bottom to top. The role of refrigerant oil in the compressor system is crucial. It not only lubricates and protects the various moving parts within the compressor, preventing wear, but also cools the compressor motor, ensuring that its temperature does not overheat and cause damage.

[0003] With the development of variable frequency compressors, the operating frequency of piston compressors is becoming wider and wider. Existing compressors cannot adjust the oil pump volume and injection height at different crankshaft speeds, resulting in insufficient lubricating oil injection height at low speeds, affecting the lubrication of piston cylinder components; while at high speeds, the lubricating oil injection height is too high, the oil discharge volume increases accordingly, and as the compressor temperature rises, the oil discharge rate of the piston compressor also increases significantly, leading to problems such as insufficient lubrication and excessive oil circulation. Summary of the Invention

[0004] To overcome the problems existing in related technologies, embodiments of the present invention propose an oil pump assembly, a crankshaft, a compressor, and a refrigeration device.

[0005] A first aspect of this invention provides an oil pump assembly for installation in the upper oil groove of a crankshaft, the oil pump assembly comprising:

[0006] The pump core has a first helical rib wound along its axial direction on its outer peripheral wall.

[0007] The spiral pump sleeve includes a second spiral rib, which is wound around the outer peripheral wall of the pump core, and a spiral oil groove is formed between the first spiral rib, the second spiral rib and the outer peripheral wall of the pump core.

[0008] One of the pump core and the spiral pump sleeve can move axially relative to the other to change the groove pitch of the spiral oil groove.

[0009] In any of the above embodiments, the first helical rib and the second helical rib have the same helical angle;

[0010] The first and second spiral ribs have a first fitting state and a second fitting state of separation. When one of the pump core and the spiral pump sleeve moves axially relative to the other, the first and second spiral ribs can switch between the first and second fitting states to change the groove spacing of the spiral oil groove.

[0011] In any of the above embodiments, the first spiral rib has a first contact surface in the axial direction of the pump core, and the second spiral rib has a second contact surface in the axial direction of the pump core.

[0012] When the first spiral rib and the second spiral rib are in a first mating state, the first mating surface and the second mating surface are mated; when the first spiral rib and the second spiral rib are in a second mating state, the first mating surface and the second mating surface are separated.

[0013] In any of the above embodiments, the pump core has a bottom end and a top end in its axial direction;

[0014] The first spiral bar has a first spiral bar starting section and a first spiral bar ending section;

[0015] The first spiral rib is located near the bottom of the pump core, and the first spiral rib is located near the top of the pump core. The first spiral rib rises in a spiral shape from the starting section to the ending section.

[0016] In any of the above embodiments, the pump assembly further includes a connecting structure, through which the pump core is connected to the spiral pump sleeve;

[0017] The connection structure is designed such that one of the pump core and the spiral pump sleeve can move axially relative to the other after connection, while restricting the circumferential rotation and radial movement of one of the pump core and the spiral pump sleeve relative to the other.

[0018] In any of the above embodiments, the connecting structure includes a limiting shaft provided on one of the pump core and the spiral pump sleeve and a limiting hole provided on the other, with the limiting shaft inserted into the limiting hole.

[0019] The limiting shaft is designed to be able to move axially along the limiting hole and be restricted from rotating in the circumferential direction of the limiting hole, and to be restricted from moving radially in the limiting hole.

[0020] In any of the above embodiments, the second spiral rib has a second spiral rib starting end and a second spiral rib ending end, and the spiral pump sleeve further includes a first limiting plate connected to the second spiral starting end and a second limiting plate connected to the second spiral ending end.

[0021] The first limiting plate is located below the bottom end of the pump core, and the second limiting plate is located above the top end of the pump core;

[0022] When one of the pump core and the spiral pump sleeve moves axially relative to the other: the first limiting plate can be attached to the bottom end of the pump core or the second limiting plate can be attached to the top end of the pump core to limit the distance that one of the pump core and the spiral pump sleeve moves axially relative to the other.

[0023] The limiting shaft is designed such that it is at least partially within the limiting hole when one of the pump core and the spiral pump sleeve moves axially relative to the other.

[0024] In any of the above embodiments, the limiting shaft is disposed on the side of the first limiting plate facing the bottom end of the pump core, the limiting hole is disposed at the bottom end of the pump core, and the limiting shaft on the first limiting plate is inserted into the limiting hole at the bottom end of the pump core.

[0025] In any of the above embodiments, the oil pump assembly further includes a connector disposed on the first limiting plate. The oil pump assembly is used to be assembled in the upper oil groove of the rotor, and the connector is used to be connected to the stator.

[0026] In any of the above embodiments, the top of the second spiral rib is connected to a first limiting plate, the limiting shaft is located at the bottom of the first limiting plate, the limiting hole is located at the top of the pump core, and the limiting shaft is inserted into the limiting hole.

[0027] In any of the above embodiments, the oil pump assembly further includes a connector disposed at the bottom of the pump core. The oil pump assembly is used to be assembled in the upper oil groove of the rotor, and the connector is used to be connected to the stator.

[0028] A second aspect of the present invention provides a crankshaft including the above-described oil pump assembly, wherein the bottom of the crankshaft is provided with an upper oil groove, and the oil pump assembly is assembled in the upper oil groove.

[0029] A third aspect of the present invention provides a compressor including the crankshaft described above. The compressor includes a stator structure, and an oil pump assembly is connected to the stator structure via a connector.

[0030] A fourth aspect of the present invention provides a refrigeration device, including the compressor described above.

[0031] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0032] This invention provides an oil pump assembly installed in an oil groove on a crankshaft. The oil pump assembly can change the groove pitch of its spiral oil groove as the compressor frequency changes. When the compressor is running at low frequency, the first spiral rib of the pump core and the second spiral rib of the spiral pump sleeve merge into one spiral rib. At this time, the groove pitch of the spiral oil groove is the largest, that is, the oil pumping channel is the widest, increasing the oil supply at low frequency. When the compressor frequency increases, one of the pump core and the spiral pump sleeve can move axially relative to the other under the action of lubricating oil. At this time, the originally merged spiral ribs separate to form a new oil pumping channel. The oil pumping channel becomes narrower, thereby reducing the oil supply at high frequency. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0034] Figure 1 This is a three-dimensional structural schematic diagram of the pump core in Embodiment 1 of the pump oil assembly of the present invention;

[0035] Figure 2 This is a three-dimensional structural schematic diagram of the spiral pump sleeve in Embodiment 1 of the oil pump assembly of the present invention;

[0036] Figure 3 This is a schematic diagram of the first state after assembly of the oil pump assembly of Embodiment 1 of the present invention;

[0037] Figure 4 for Figure 3 A cross-sectional view of the embodiment;

[0038] Figure 5 This is a schematic diagram of the second state of the oil pump assembly in Embodiment 1 of the present invention after assembly;

[0039] Figure 6 for Figure 5 A cross-sectional view of the embodiment;

[0040] Figure 7 This is a schematic diagram of the third state after assembly of the pump oil assembly in Embodiment 1 of the present invention;

[0041] Figure 8 for Figure 7 A cross-sectional view of the embodiment;

[0042] Figure 9 This is a cross-sectional structural schematic diagram of an embodiment of the crankshaft of the present invention;

[0043] Figure 10 This is a schematic diagram of the first state after assembly of the oil pump assembly in Embodiment 2 of the present invention;

[0044] Figure 11 This is a schematic diagram of the second state after assembly of the oil pump assembly in Embodiment 2 of the present invention;

[0045] Figure 12 This is a three-dimensional structural diagram of the pump core in Embodiment 2 of the pump assembly of the present invention;

[0046] Figure 13 This is a three-dimensional structural schematic diagram of the spiral pump sleeve in Embodiment 2 of the pump assembly of the present invention.

[0047] Wherein: 1-pump core; 1a-pump core bottom end; 1b-pump core top end; 11-first spiral rib; 111-first mating surface; 2-spiral pump sleeve; 21-second spiral rib; 22-first limiting plate; 23-second limiting plate; 211-second mating surface; 3-spiral oil groove; 41-limiting shaft; 42-limiting hole; 5-connecting piece; 6-crankshaft; 7-pump oil assembly. Detailed Implementation

[0048] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0049] Current compressors cannot adjust the oil volume and injection height at different crankshaft speeds, resulting in insufficient oil injection height at low speeds, affecting the lubrication of the piston and cylinder assembly. At high speeds, the oil injection height is too high, increasing the oil discharge. Furthermore, as the compressor temperature rises, the oil discharge rate of the piston compressor also increases significantly, leading to insufficient lubrication and excessive oil circulation. This invention provides an oil pump assembly installed in an oil groove on the crankshaft. This assembly can change the groove pitch of its spiral oil grooves according to the compressor frequency. When the compressor operates at low frequency, the first spiral rib of the pump core and the second spiral rib of the spiral pump sleeve merge into one spiral rib, at which point the groove pitch of the spiral oil groove is at its maximum, i.e., the oil pumping channel is widest, increasing the oil volume at low frequencies. When the compressor frequency increases, one of the pump core and the spiral pump sleeve can move axially relative to the other under the action of lubricating oil. At this time, the originally merged spiral ribs separate, forming a new oil pumping channel. The oil pumping channel narrows, thereby reducing the oil volume at high frequencies.

[0050] The following is in conjunction with the appendix Figure 1-10 The technical solution of this embodiment is described in detail. Unless otherwise specified, the following implementation methods and embodiments can be combined with each other.

[0051] Example 1

[0052] like Figures 1-8 As shown, the first aspect of this embodiment provides an oil pump assembly for installation in the upper oil groove of the crankshaft. The oil pump assembly includes:

[0053] like Figure 1 The pump core 1 shown has a first helical rib 11 wound around its outer peripheral wall along its axial direction;

[0054] like Figure 2 The spiral pump sleeve 2 shown includes a second spiral rib 21, which is wound around the outer peripheral wall of the pump core 1, and a spiral oil groove 3 is formed between the first spiral rib 11, the second spiral rib 21 and the outer peripheral wall of the pump core 1.

[0055] Among them, such as Figures 3-8As shown, one of the pump core 1 and the spiral pump sleeve 2 can move axially relative to the other to change the groove pitch of the spiral oil groove 3. When the oil pump assembly in this embodiment of the invention is installed in the upper oil groove of the compressor crankshaft, the oil pump assembly can change the groove pitch of its own spiral oil groove as the compressor frequency changes. Specifically;

[0056] When the compressor operates at low frequency, the first helical rib 11 of the pump core 1 and the second helical rib 21 of the helical pump sleeve 2 approach each other, such as... Figure 3 and Figure 4 As shown, the groove spacing of the spiral oil groove 3 is relatively large at this time, that is, the oil pump channel is the widest, so as to increase the amount of oil supplied to the compressor when it is running at low frequency.

[0057] When the compressor is running at high frequency, such as Figures 5-8 As shown, one of the pump core 1 and the spiral pump sleeve 2 can move axially relative to the other under the action of lubricating oil. At this time, the first spiral rib 11 and the second spiral rib 21 that are close to each other move away from each other, that is, the oil pumping channel becomes narrower, thereby reducing the amount of oil supplied to the compressor when it is running at high frequency.

[0058] Furthermore, such as Figures 3-8 As shown, in this embodiment of the invention, the first helical rib 11 and the second helical rib 21 have the same helical angle;

[0059] The first spiral rib 11 and the second spiral rib 21 are such that... Figure 3 and Figure 4 The first mating state shown and as Figures 5-8 The second coordination state of separation is shown.

[0060] When one of the pump core 1 and the spiral pump sleeve 2 moves axially relative to the other, the first spiral rib 11 and the second spiral rib 21 can switch between the first and second mating states to change the groove spacing of the spiral oil groove 3.

[0061] Specifically, when the compressor is running at low frequency, the first spiral rib 11 on the pump core 1 and the second spiral rib 21 on the spiral pump sleeve 2 merge into one spiral rib. At this time, the groove spacing of the spiral oil groove is the largest, that is, the oil pumping channel is the widest, which increases the amount of oil supplied at low frequency. When the frequency of the compressor increases, one of the pump core 1 and the spiral pump sleeve 2 can move axially relative to the other under the action of lubricating oil. At this time, the originally merged spiral ribs {first spiral rib 11 and second spiral rib 21} separate to form a new oil pumping channel. The oil pumping channel becomes narrower, thereby reducing the amount of oil supplied to the compressor when it is running at high frequency.

[0062] It should be noted that the helical angles of the first helical rib 11 and the second helical rib 21 in this embodiment of the invention can be changed accordingly based on the specifications and model of the compressor. However, it should be noted that changing the helical angles of the first helical rib 11 and the second helical rib 21 mentioned in this embodiment means simultaneously changing the angles of the first helical rib 11 and the second helical rib 21, that is, keeping the helical angles of the first helical rib 11 and the second helical rib 21 the same at all times, so that the first helical rib 11 and the second helical rib 21 can fit together completely.

[0063] It should also be noted that the design parameters such as the width of the first spiral rib 11 and the second spiral rib 21, the width of the spiral oil groove 3, and the groove depth of the spiral oil groove 3 can also be set according to the specific design. In this embodiment of the invention, the above design parameters are not specifically limited.

[0064] More specifically, such as Figure 6 As shown, the first spiral rib 11 has a first contact surface 111 in the axial direction of the pump core 1, and the second spiral rib 21 has a second contact surface 211 in the axial direction of the pump core 1.

[0065] Among them, such as Figure 3 and Figure 4 As shown, when the first spiral rib 11 and the second spiral rib 21 are in a first mating state, the first mating surface 111 and the second mating surface 211 are mated. At this time, the groove spacing of the spiral oil groove 3 is relatively wide, and the amount of oil applied is relatively large.

[0066] like Figures 5-8 As shown, when the first spiral rib 11 and the second spiral rib 21 are in a separated second mating state, the first mating surface 111 and the second mating surface 211 are separated. At this time, the groove spacing of the spiral oil groove 3 is narrow and the amount of oil applied is small.

[0067] In any of the above embodiments, such as Figure 1 As shown, the pump core 1 has a bottom end 1a and a top end 1b in its axial direction;

[0068] The first spiral rib 11 has a first spiral rib starting section and a first spiral rib ending section;

[0069] The first spiral rib is located near the bottom end 1a of the pump core and near the top end 1b of the pump core. The first spiral rib 11 spirals upward from the starting section to the ending section.

[0070] In this embodiment of the invention, the first spiral rib 11 extends spirally from one side of the bottom end 1a of the pump core to one side of the top end 1b of the pump core, thereby improving the oiling effect.

[0071] In any of the above embodiments, the pump assembly further includes a connecting structure, through which the pump core 1 is connected to the spiral pump sleeve 2.

[0072] The connection structure is designed such that one of the pump core 1 and the spiral pump sleeve 2 can move axially relative to the other, while restricting the circumferential rotation and radial movement of one of the pump core 1 and the spiral pump sleeve 2 relative to the other.

[0073] In this embodiment of the invention, one of the pump core 1 and the spiral pump sleeve 2 can only move axially relative to the other along the axial direction of the pump core 1, and cannot rotate circumferentially or move radially relative to the other, thereby avoiding the oiling effect of the spiral oil groove 3 when one of the pump core 1 and the spiral pump sleeve 2 rotates circumferentially or moves radially relative to the other.

[0074] Specifically, such as Figures 2-8 As shown, the connection structure includes a limiting shaft 41 provided on one of the pump core 1 and the spiral pump sleeve 2 and a limiting hole 42 provided on the other, with the limiting shaft 41 inserted into the limiting hole 42.

[0075] The limiting shaft 41 is designed to be able to move along the axial direction of the limiting hole 42 and be restricted from rotating in the circumferential direction of the limiting hole 42, and to be restricted from moving in the radial direction of the limiting hole 42.

[0076] Specifically, the limiting shaft 41 and the limiting hole 42 are shaped and sized to match, and can be elliptical cylinders. Of course, in some alternative embodiments, the shape of the limiting shaft 41 and the limiting hole 42 is not limited to elliptical cylinders, and can also be cross-shaped cylinders, etc., as long as they can satisfy the requirement of limiting the radial movement and rotation of the pump core 1 or the spiral pump sleeve 2, and are easy to manufacture.

[0077] Furthermore, such as Figures 2-8 As shown, the second spiral rib 21 has a second spiral rib starting end and a second spiral rib ending end, and the spiral pump sleeve 2 also includes a first limiting plate 22 connected to the second spiral starting end and a second limiting plate 23 connected to the second spiral ending end;

[0078] The first limiting plate 22 is located below the bottom end of the pump core 1, and the second limiting plate 23 is located above the top end of the pump core 1.

[0079] When one of the pump core 1 and the spiral pump sleeve 2 moves axially relative to the other: the first limiting plate 22 can be attached to the bottom end of the pump core 1 or the second limiting plate 23 can be attached to the top end of the pump core 1 to limit the distance when one of the pump core 1 and the spiral pump sleeve 2 moves axially relative to the other.

[0080] The limiting shaft 41 is designed such that it is at least partially within the limiting hole 42 when one of the pump core 1 and the spiral pump sleeve 2 moves axially relative to the other.

[0081] In this embodiment of the invention, the height of the limiting shaft 41 is set based on the farthest movement distance of one of the pump core 1 and the spiral pump sleeve 2 relative to the other in the axial direction. This prevents the limiting shaft 41 from completely disengaging from the limiting hole 42 when one of the pump core 1 and the spiral pump sleeve 2 moves axially relative to the other, thereby improving the stability of one of the pump core 1 and the spiral pump sleeve 2 in the axial direction relative to the other.

[0082] Specifically, such as Figures 3-8 As shown, the limiting shaft 41 is provided on the side of the first limiting plate 22 facing the bottom end 1a of the pump core, and the limiting hole 42 is provided on the bottom end 1a of the pump core. The limiting shaft 41 on the first limiting plate 22 is inserted into the limiting hole 42 of the bottom end 1a of the pump core.

[0083] More specifically, such as Figures 5-8 As shown, the oil pump assembly also includes a connector 5 disposed on the limiting shaft 41, and the oil pump assembly can be assembled into the crankshaft through the connector 5.

[0084] To better understand the working distance of the oil pump assembly installed inside the compressor crankshaft in this embodiment, the following is a combination of... Figures 1-9 Please provide a detailed explanation:

[0085] like Figure 2 As shown, the spiral pump sleeve 2 is provided with a first limiting plate 22, a second limiting plate 23, and a second spiral rib 21 disposed between the first limiting plate 22 and the second limiting plate 23. The first limiting plate is provided with a limiting shaft 41 and a connecting piece 5. The first limiting plate 22 is located on the lower side of the spiral pump sleeve 2, and the limiting shaft 41 is located above the first limiting plate 22. The limiting shaft 41 is an elliptical cylinder, and its main purpose is to limit the radial and circumferential movement of the pump core 1 to prevent its radial movement and rotation. The connecting piece 5 is located below the first limiting plate 22. The connecting piece 5 is mainly used to limit the overall movement of the spiral oil pump. The connecting piece 5 is provided with a connecting hole. When the spiral oil pump is placed in the upper oil groove of the crankshaft, a steel wire is passed through the connecting hole and fixed to the motor stator to fix the spiral oil pump. The second spiral rib 21 of the spiral pump sleeve 2 is spirally ascending (of course, the first spiral rib 11 on the pump core 1 is also like this), connecting the first limiting plate 22 and the second limiting plate 23, and surrounding the outer peripheral wall of the pump core 1.

[0086] like Figure 1 and Figure 6 As shown, the pump core 1 is provided with a first spiral rib 11 and a limiting shaft 41, and the shape of the limiting hole 42 must match the shape of the limiting shaft 41.

[0087] After the spiral pump sleeve 2 and the pump core 1 are assembled, they form a complete oil pump assembly. The pump core 1 is inside the spiral pump sleeve 2, and the limiting shaft 41 is inserted into the limiting hole 42.

[0088] The spiral oil pump assembly is placed into the oil hole of the crankshaft 6 and its position is fixed with steel wire. When the crankshaft 6 rotates at low frequency, the pump core 1 is located below the inside of the spiral pump sleeve 2. As the speed of the crankshaft 6 increases, the amount of oil pumped increases, and the pump core 1 will gradually rise and move vertically along its axis.

[0089] Initially, the second spiral rib 21 of the spiral pump sleeve 2 and the first spiral rib 11 on the pump core merge to form a single spiral rib. At this time, the groove spacing of the spiral oil groove 3 is the widest, which is beneficial for low-frequency oil application. As the pump core 1 rises, the originally merged first spiral rib 11 and second spiral rib 21 gradually separate to form two spiral ribs. The groove spacing of the spiral oil groove also narrows, hindering high-frequency oil application.

[0090] When the crankshaft 6 rotates at different speeds, the spiral pump sleeve 2 remains stationary, while the pump core 1 moves vertically with the change in compressor frequency, thereby changing the width of the spiral oil groove, that is, changing the width of the oil supply channel on the oil pump assembly. This enables the crankshaft to adaptively change the amount of oil supplied and / or the oil supply speed according to the change in compressor operating frequency, thus solving problems such as insufficient lubrication and excessive oil circulation during compressor operation.

[0091] It should be noted that the spiral oil pump assembly in the embodiments of the present invention is made of PBT material {polybutylene terephthalate (PBT) resin and polycarbonate (PC) / PBT mixture}.

[0092] The second invention in this embodiment provides a method such as Figure 9 The crankshaft shown includes the aforementioned oil pump assembly 7, wherein the bottom of the crankshaft 6 is provided with an upper oil groove, and the oil pump assembly 7 is assembled in the upper oil groove.

[0093] Specifically, when the oil pump assembly is placed into the upper oil groove of the crankshaft 6, the position of the oil pump assembly 7 is fixed by passing a wire or steel wire through the limiting hole on the connector 5 on the oil pump assembly 7. The two ends of the wire or steel wire are hook-shaped and can be hung on the frame of the motor stator.

[0094] When the oil pump assembly is installed in the upper oil groove of the rotor, the overall height of the spiral structure on the oil pump assembly is slightly higher than the bottom of the upper oil groove of the crankshaft.

[0095] A third aspect of the present invention also provides a compressor, which includes a stator structure and an oil pump assembly connected to the stator structure via a connector 5.

[0096] A fourth aspect of the present invention also provides a refrigeration device, which includes the compressor described above.

[0097] Example 2

[0098] The difference between this embodiment and Embodiment 1 is that, as Figures 10-13As shown, in this embodiment, the top of the second spiral rib (21) is connected to a second limiting plate (23), the limiting shaft (41) is located at the bottom of the second limiting plate (23), the limiting hole is located at the top of the pump core (1), and the limiting shaft (41) is inserted into the limiting hole.

[0099] In addition, the oil pump assembly also includes a connector (5) located at the bottom of the pump core (1). The oil pump assembly (5) is used to be assembled in the upper oil groove of the rotor, and the connector (5) is used to be connected to the stator.

[0100] When installing the oil pump assembly, a wire is connected to the bottom of the pump core 1, and the spiral pump sleeve 2 is inserted from the top of the pump core 1. A limiting hole (not shown in the figure) is opened at the center of the top of the pump core 1. The spiral pump sleeve 2 is equipped with a first limiting plate 23 and a limiting shaft 41. The first limiting plate of the spiral pump sleeve 2 rises to a certain extent to reach the narrowing position of the crankshaft center oil hole, and cannot rise further, thus achieving a limiting effect.

[0101] Although the movable parts in Embodiment 1 and Embodiment 2 are different, they can both achieve the technical effect of adaptively changing the amount and / or speed of oil on the crankshaft according to the change of the compressor's operating frequency. That is, the oil pump assembly in Embodiment 1 and Embodiment 2 can solve the problems of insufficient lubrication and excessive oil circulation when the compressor is running.

[0102] Example 3

[0103] The difference between this embodiment and Embodiments 1 and 2 is that: in this embodiment, the limiting shaft 41 is located at the bottom end 1a of the pump core, the limiting hole 42 is located on the first limiting plate 22, and the limiting shaft 41 at the bottom end 1a of the pump core is inserted into the limiting hole 42 on the first limiting plate 22.

[0104] Specifically, the oil pump assembly also includes a connector 5 located on the limiting shaft 41, and the oil pump assembly can be assembled into the crankshaft via the connector 5.

[0105] When the oil pump assembly in this embodiment is assembled in the oil hole of the crankshaft 6, the oil pump assembly is connected to the stator through the connector 5 on the limiting shaft 41 at the bottom end 1a of the pump core, thereby fixing the position of the oil pump assembly.

[0106] In the oil pump assembly of Example 1, the spiral pump sleeve 2 is fixed in position, while the pump core 1 can move axially relative to the spiral pump sleeve 2.

[0107] In this embodiment, the pump core 1 in the oil pump assembly is fixed in position, while the spiral pump sleeve 2 can move axially relative to the pump core 1.

[0108] Although the movable parts in Embodiment 3 are different from those in Embodiments 1 and 2, the same technical effect of adaptively changing the amount and / or speed of oil on the crankshaft according to the change of the compressor's operating frequency can be achieved. That is, the oil pump assembly in Embodiments 1 and 2 can solve the problems of insufficient lubrication and excessive oil circulation when the compressor is running.

[0109] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0110] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An oil pump assembly for installation in the upper oil groove of a crankshaft, characterized in that, The oil pump assembly includes: Pump core (1), the outer peripheral wall of the pump core (1) is provided with a first helical rib (11) along its axial direction. The spiral pump sleeve (2) includes a second spiral rib (21), which is wound around the outer peripheral wall of the pump core (1), and a spiral oil groove (3) is formed between the first spiral rib (11), the second spiral rib (21) and the outer peripheral wall of the pump core (1). One of the pump core (1) and the spiral pump sleeve (2) can be moved axially relative to the other to change the groove pitch of the spiral oil groove (3); The oil pump assembly also includes a connecting structure, through which the pump core (1) is connected to the spiral pump sleeve (2); The connection structure is designed such that one of the connected pump core (1) and the spiral pump sleeve (2) can move axially relative to the other, and restricts the circumferential rotation and radial movement of one of the pump core (1) and the spiral pump sleeve (2) relative to the other. The connection structure includes a limiting shaft (41) provided on one of the pump core (1) and the spiral pump sleeve (2) and a limiting hole (42) provided on the other, wherein the limiting shaft (41) is inserted into the limiting hole (42); The limiting shaft (41) is designed to be movable along the axial direction of the limiting hole (42) and to be restricted to rotation in the circumferential direction of the limiting hole (42) and to be restricted to movement in the radial direction of the limiting hole (42).

2. The oil pump assembly according to claim 1, characterized in that, The first spiral rib (11) and the second spiral rib (21) have the same spiral angle; The first spiral rib (11) and the second spiral rib (21) have a first mating state and a second mating state of separation. When one of the pump core (1) and the spiral pump sleeve (2) moves axially relative to the other, the first spiral rib (11) and the second spiral rib (21) can switch between the first mating state and the second mating state to change the groove spacing of the spiral oil groove (3).

3. The oil pump assembly according to claim 2, characterized in that, The first spiral rib (11) has a first contact surface (111) in the axial direction of the pump core (1), and the second spiral rib (21) has a second contact surface (211) in the axial direction of the pump core (1). When the first spiral rib (11) and the second spiral rib (21) are in a first mating state, the first mating surface (111) and the second mating surface (211) are mated; when the first spiral rib (11) and the second spiral rib (21) are in a second mating state, the first mating surface (111) and the second mating surface (211) are separated.

4. The oil pump assembly according to any one of claims 1-3, characterized in that, The pump core (1) has a bottom end (1a) and a top end (1b) in its axial direction. The first spiral rib (11) has a first spiral rib starting end and a first spiral rib ending end; The first spiral rib is located near the bottom end (1a) of the pump core and near the top end (1b) of the pump core. The first spiral rib (11) spirals upward from the starting end to the ending end.

5. The oil pump assembly according to claim 1, characterized in that, The second spiral rib (21) has a second spiral rib starting end and a second spiral rib ending end. The spiral pump sleeve also includes a first limiting plate (22) connected to the second spiral rib starting end and a second limiting plate (23) connected to the second spiral rib ending end. The first limiting plate (22) is located below the bottom end of the pump core (1), and the second limiting plate (23) is located above the top end of the pump core (1); When one of the pump core (1) and the spiral pump sleeve (2) moves axially relative to the other: the first limiting plate (22) can be attached to the bottom end of the pump core (1) or the second limiting plate (23) can be attached to the top end of the pump core (1) to limit the distance when one of the pump core (1) and the spiral pump sleeve (2) moves axially relative to the other. The limiting shaft (41) is designed such that when one of the pump core (1) and the spiral pump sleeve (2) moves axially relative to the other, it is at least partially within the limiting hole (42).

6. The oil pump assembly according to claim 5, characterized in that, The limiting shaft (41) is located on the side of the first limiting plate (22) facing the bottom end (1a) of the pump core, and the limiting hole (42) is located at the bottom end (1a) of the pump core. The limiting shaft (41) on the first limiting plate (22) is inserted into the limiting hole (42) at the bottom end (1a) of the pump core.

7. The oil pump assembly according to claim 6, characterized in that, The oil pump assembly also includes a connector (5) disposed on the first limiting plate. The oil pump assembly (7) is used to be assembled in the upper oil groove of the rotor, and the connector (5) is used to be connected to the stator.

8. The oil pump assembly according to claim 1, characterized in that, The top of the second spiral rib (21) is connected to a second limiting plate (23), the limiting shaft (41) is located at the bottom of the second limiting plate (23), the limiting hole is located at the top of the pump core (1), and the limiting shaft (41) is inserted into the limiting hole.

9. The oil pump assembly according to claim 8, characterized in that, The oil pump assembly also includes a connector (5) located at the bottom of the pump core (1). The oil pump assembly (7) is used to be assembled in the upper oil groove of the rotor, and the connector (5) is used to be connected to the stator.

10. A crankshaft comprising the oil pump assembly (7) according to any one of claims 1-9, characterized in that, The bottom of the crankshaft (6) is provided with an upper oil groove, and the oil pump assembly (7) is assembled in the upper oil groove.

11. A compressor, characterized in that, The compressor includes the crankshaft as described in claim 10, and the compressor includes a stator structure, wherein the oil pump assembly of the crankshaft is connected to the stator structure via a connector.

12. A refrigeration device, characterized in that, Includes the compressor described in claim 11.

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