Oil brake assembly and refrigerant pump

Abstract

The utility model belongs to the technical field of refrigerant pumps, and discloses an oil brake assembly and a refrigerant pump, the oil brake assembly comprises a motor shaft and a stirring piece, the peripheral wall of the motor shaft is provided with external threads, the stirring piece comprises a stirring shaft and stirring blades arranged on the stirring shaft, the stirring shaft is provided with a sleeve hole, and the stirring blades are arranged in the sleeve hole. The stirring shaft is arranged on the motor shaft in a sleeving mode through the sleeve hole, the inner circumferential wall of the sleeve hole is provided with an inner thread capable of being in threaded connection with the outer thread on the outer circumferential wall of the motor shaft, and the rotating direction of the inner thread on the inner circumferential wall of the sleeve hole is the same as the rotating direction when the motor shaft rotates forwards to drive a pump body of the refrigerant pump to pump out a liquid refrigerant. The refrigerant pump comprises a shell, a pump body and the oil brake assembly, and the first end of the motor shaft is connected with the crankshaft of the pump body. The oil brake assembly provided by the utility model is simple in structure, can effectively inhibit the reverse rotation trend of the motor shaft when the refrigerant pump stops working, forces the reverse rotation of the motor shaft to stop as soon as possible, and reduces the damage to a motor structure and a frequency converter in the refrigerant pump.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerant pumps, in particular to an oil brake assembly and a refrigerant pump. Background Art

[0002] In the prior art, when the refrigerant pump works, the motor shaft in the refrigerant pump rotates to drive the crankshaft of the pump body, thereby driving the piston to move, so that the volume formed by the piston, the upper cylinder head, the lower cylinder head, the vane and the cylinder changes, compressing the liquid refrigerant, so that the liquid refrigerant obtains a certain pressure and is discharged from the refrigerant pump.

[0003] However, when the refrigerant pump suddenly stops due to power failure or other reasons during operation, the high-pressure liquid refrigerant outside the refrigerant pump or the high-pressure liquid refrigerant existing in the refrigerant pump will cause the crankshaft of the pump body to reverse, and then drive the motor shaft to reverse. The reverse rotation of the motor shaft will generate a large reverse current and reverse voltage, which may burn out the motor structure and frequency converter and other devices in the refrigerant pump, and seriously damage the refrigerant pump. Therefore, how to effectively suppress the reverse rotation of the motor shaft when the refrigerant pump suddenly stops has become the direction of the efforts of those skilled in the art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an oil brake assembly and a refrigerant pump, which have a simple structure, can effectively suppress the reverse rotation trend of the motor shaft when the refrigerant pump stops working, force the reverse rotation of the motor shaft to stop as soon as possible, and reduce the damage to the refrigerant pump.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An oil brake assembly, comprising:

[0007] A motor shaft, the outer peripheral wall of which is provided with an external thread;

[0008] A stirring member, including a stirring shaft and stirring blades provided on the stirring shaft, the stirring shaft is provided with a sleeve hole, the stirring shaft is sleeved on the motor shaft through the sleeve hole, and the inner peripheral wall of the sleeve hole is provided with an internal thread capable of being screwed with the external thread on the outer peripheral wall of the motor shaft;

[0009] The helix direction of the internal thread on the inner peripheral wall of the sleeve hole is the same as the rotation direction when the motor shaft rotates forward to drive the pump body of the refrigerant pump to pump out the liquid refrigerant.

[0010] Preferably, along the axial direction of the motor shaft, snap rings are clamped on both sides of the motor shaft opposite to the stirring shaft.

[0011] Preferably, the shape of the snap ring is set to be C-shaped.

[0012] Preferably, an annular groove is provided on the outer peripheral wall of the motor shaft, and the snap ring is clamped in the annular groove.

[0013] Preferably, a plurality of stirring blades are provided, and the plurality of stirring blades are circumferentially spaced along the stirring shaft.

[0014] Preferably, the stirring blade and the stirring shaft are integrally formed.

[0015] Preferably, a fillet transition connection is provided between the stirring blade and the stirring shaft.

[0016] A refrigerant pump includes:

[0017] A housing;

[0018] A pump body provided in the housing;

[0019] The pump body includes a crankshaft;

[0020] For the oil brake assembly as described in any one of the above, the first end of the motor shaft is connected to the crankshaft.

[0021] Preferably, it further includes a stator and a rotor. The stator is fixed in the housing, the rotor is rotatably arranged inside the stator, and the second end of the motor shaft is fixedly connected to the rotor.

[0022] Preferably, along the axial direction of the motor shaft, the stirring shaft is located between the stator and the pump body.

[0023] Beneficial effects:

[0024] When the oil brake assembly provided by the present utility model is applied to a refrigerant pump, when the refrigerant pump works, the motor shaft rotates forward, driving the pump body of the refrigerant pump to pump out the liquid refrigerant and flow towards the refrigerant pump outlet. During this process, the liquid refrigerant fills the shell of the refrigerant pump. The stirring member is immersed in the liquid refrigerant, and the liquid refrigerant will exert a certain resistance on the stirring blades and the stirring shaft of the stirring member, and this resistance can keep the stirring member floating in the shell. Since the helix direction of the internal thread on the inner peripheral wall of the sleeve hole is the same as the rotation direction when the motor shaft rotates forward to drive the pump body of the refrigerant pump to pump out the liquid refrigerant, when the motor shaft rotates forward, under the action of the resistance exerted by the liquid refrigerant on the stirring member, the external thread of the motor shaft and the internal thread on the inner peripheral wall of the sleeve hole will tend to unwind, that is, the stirring shaft will disengage from the screwed connection state with the motor shaft, and the stirring member is only in a state of being movably sleeved on the motor shaft. When the refrigerant pump stops working, the high-pressure liquid refrigerant outside the pump body of the refrigerant pump flows back into the pump body, driving the pump body to reverse and driving the motor shaft to reverse. At this time, when the motor shaft reverses, the real-time rotation direction of the motor shaft and the helix direction of the internal thread on the inner peripheral wall of the sleeve hole become opposite, which will make the external thread of the motor shaft and the internal thread on the inner peripheral wall of the sleeve hole tend to be gradually tightened. Eventually, the stirring shaft can be completely tightened on the motor shaft and rotate together under the drive of the motor shaft. The rotation of the stirring shaft can drive the stirring blades to rotate, so that the stirring blades stir the liquid refrigerant in the shell, thereby consuming the kinetic energy of the motor shaft, forcing the reverse rotation of the motor shaft to stop as soon as possible, effectively suppressing the reverse rotation trend of the motor shaft, achieving a reliable oil braking effect, and reducing the adverse consequences brought by the reverse rotation of the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the oil brake assembly provided by the present utility model;

[0026] Figure 2 is a schematic structural diagram of the stirring member provided by the present utility model;

[0027] Figure 3 is the present utility model in Figure 2 a sectional view taken along the A direction in;

[0028] Figure 4 is a schematic structural diagram of the refrigerant pump provided by the present utility model.

[0029] In the figure:

[0030] 1. Motor shaft; 11. Snap ring;

[0031] 2. Stirring member; 21. Stirring shaft; 211. Sleeve hole; 22. Stirring blades; 23. Rounded corner;

[0032] 3. Shell;

[0033] 4. Pump body;

[0034] 5. Stator;

[0035] 6. Rotor. Detailed implementation manner

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

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

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below the bottom", and "under the bottom" of the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0040] This embodiment provides a refrigerant pump. Refer to Figures 1 to 4As shown, the refrigerant pump includes a housing 3 and a pump body 4, where the pump body 4 is disposed within the housing 3. This embodiment also provides an oil brake assembly, which includes a motor shaft 1 and a stirring member 2. Among them, an external thread is provided on the outer peripheral wall of the motor shaft 1. The stirring member 2 includes a stirring shaft 21 and stirring blades 22 provided on the stirring shaft 21. A sleeve hole 211 is formed in the stirring shaft 21, and the stirring shaft 21 is sleeved on the motor shaft 1 through the sleeve hole 211. An internal thread capable of being screwed with the external thread on the outer peripheral wall of the motor shaft 1 is provided on the inner peripheral wall of the sleeve hole 211. The helix direction of the internal thread on the inner peripheral wall of the sleeve hole 211 is the same as the rotation direction when the motor shaft 1 rotates forward to drive the pump body 4 of the refrigerant pump to pump out the liquid refrigerant.

[0041] In this embodiment, when the refrigerant pump is operating, the motor shaft 1 rotates forward, driving the pump body 4 of the refrigerant pump to pump out the liquid refrigerant and flow towards the refrigerant pump outlet. During this process, the liquid refrigerant fills the housing 3 of the refrigerant pump. The stirring member 2 is immersed in the liquid refrigerant, and the liquid refrigerant will exert a certain resistance on the stirring blades 22 and the stirring shaft 21 of the stirring member 2, and this resistance can keep the stirring member 2 floating within the housing 3. Since the helix direction of the internal thread on the inner peripheral wall of the sleeve hole 211 is the same as the rotation direction when the motor shaft 1 rotates forward to drive the pump body 4 of the refrigerant pump to pump out the liquid refrigerant, when the motor shaft 1 rotates forward, under the action of the resistance exerted by the liquid refrigerant on the stirring member 2, it will cause the external thread of the motor shaft 1 and the internal thread on the inner peripheral wall of the sleeve hole 211 to tend to unwind, that is, the stirring shaft 21 disengages from the screwed state with the motor shaft 1, and the stirring member 2 is only in a state of being movably sleeved on the motor shaft 1. When the refrigerant pump stops operating, a part of the high-pressure liquid refrigerant outside the pump body 4 of the refrigerant pump flows back into the pump body 4, driving the pump body 4 to reverse and driving the motor shaft 1 to reverse. At this time, when the motor shaft 1 rotates in reverse, the real-time rotation direction of the motor shaft 1 and the helix direction of the internal thread on the inner peripheral wall of the sleeve hole 211 become opposite, which will cause the external thread of the motor shaft 1 and the internal thread on the inner peripheral wall of the sleeve hole 211 to tend to be gradually screwed tightly. Eventually, the stirring shaft 21 can be completely screwed tightly to the motor shaft 1 and rotate together under the drive of the motor shaft 1. The rotation of the stirring shaft 21 can drive the stirring blades 22 to rotate, so that the stirring blades 22 stir the liquid refrigerant within the housing 3, thereby consuming the kinetic energy of the motor shaft 1, forcing the reverse rotation of the motor shaft 1 to stop as soon as possible, effectively suppressing the reverse rotation trend of the motor shaft 1, achieving a reliable oil brake effect, and reducing the adverse consequences brought by the reverse rotation of the motor shaft 1.

[0042] Exemplarily, the internal thread of the inner peripheral wall of the socket hole 211 is set to be left-handed. That is, when viewed from above, if the socket hole 211 is to be screwed onto the motor shaft 1, it needs to be screwed clockwise into the stationary motor shaft 1. The rotation direction of the motor shaft 1 when it rotates forward to drive the pump body 4 of the refrigerant pump to pump out the liquid refrigerant is counterclockwise. When the refrigerant pump is working, the motor shaft 1 rotates forward, that is, the motor shaft 1 rotates counterclockwise, which is the same as the internal thread rotation direction of the socket hole 211 of the stirring shaft 21. At this time, under the action of the resistance applied by the liquid refrigerant to the stirring member 2, the external thread of the motor shaft 1 and the internal thread of the inner peripheral wall of the socket hole 211 will tend to unwind, that is, the stirring shaft 21 will disengage from the screwed connection with the motor shaft 1, and the stirring member 2 is only in a state of being movably sleeved on the motor shaft 1. When the refrigerant pump stops working, the motor shaft 1 rotates in reverse, that is, rotates clockwise. At this time, the external thread of the motor shaft 1 and the internal thread of the inner peripheral wall of the socket hole 211 tend to be gradually tightened, and finally the stirring shaft 21 can be completely tightened on the motor shaft 1 and rotate together under the drive of the motor shaft 1.

[0043] In this embodiment, along the axial direction of the motor shaft 1, snap rings 11 are clamped on both sides of the motor shaft 1 opposite to the stirring shaft 21. The setting of the snap rings 11 can reliably limit the stirring shaft 21 in the axial direction of the motor shaft 1 and prevent the stirring shaft 21 from floating up and down relative to the motor shaft 1 too much.

[0044] Optionally, the shape of the snap ring 11 is set to be C-shaped. With this setting, it is convenient to disassemble and assemble the snap ring 11.

[0045] In some other alternative embodiments, the snap ring 11 can also be set to be O-shaped, and no further limitation is made here.

[0046] Optionally, a ring groove is provided on the outer peripheral wall of the motor shaft 1, and the snap ring 11 is clamped in the ring groove. The setting of the ring groove can provide a reliable and stable clamping space for the snap ring 11 and ensure the effective positioning of the snap ring 11.

[0047] In this embodiment, the number of stirring blades 22 is set to be multiple, and the multiple stirring blades 22 are circumferentially spaced along the stirring shaft 21.

[0048] As an alternative embodiment, when the motor shaft 1 rotates forward to drive the pump body 4 of the refrigerant pump to pump out the liquid refrigerant, the liquid refrigerant flows forward and pushes against the blades to drive the stirring shaft 21 to rotate around the direction of releasing the helix from the motor shaft 1, further causing the stirring shaft 21 to disengage from the screwed connection with the motor shaft 1. When the refrigerant pump stops working, the liquid refrigerant flows back in the reverse direction and pushes against the blades to drive the stirring shaft 21 to rotate around the direction of screwing into the motor shaft 1, so that the stirring shaft 21 is tightened on the motor shaft 1.

[0049] Optionally, the agitating blade 22 is integrally formed with the agitating shaft 21. In this way, the process of separately assembling the agitating blade 22 and the agitating shaft 21 can be omitted, and the use of external connecting parts such as screws and bolts can also be omitted.

[0050] Optionally, a fillet 23 is provided for transitional connection between the agitating blade 22 and the agitating shaft 21. By providing the fillet 23, stress concentration between the agitating blade 22 and the agitating shaft 21 is avoided, effectively ensuring the reliable strength of the agitating member 2.

[0051] In this embodiment, the refrigerant pump further includes a stator 5 and a rotor 6. The stator 5 is fixed inside the housing 3, and the rotor 6 is rotatably arranged inside the stator 5. The second end of the motor shaft 1 is fixedly connected to the rotor 6.

[0052] Furthermore, along the axial direction of the motor shaft 1, the agitating shaft 21 is located between the stator 5 and the pump body 4. With this arrangement, this part of the space between the stator 5 and the pump body 4 is effectively utilized, and the agitating blade 22 can be in full contact with the liquid refrigerant.

[0053] In summary, the oil brake assembly and the refrigerant pump provided in this embodiment have a simple structure, can effectively inhibit the reverse rotation tendency of the motor shaft 1 when the refrigerant pump stops working, force the reverse rotation of the motor shaft 1 to stop as soon as possible, and reduce the damage to the refrigerant pump.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An oil brake assembly, characterized in that, Comprising: A motor shaft (1), an outer peripheral wall of the motor shaft (1) being provided with an external thread; A stirring member (2), comprising a stirring shaft (21) and stirring blades (22) provided on the stirring shaft (21), the stirring shaft (21) being provided with a sleeve hole (211), the stirring shaft (21) being sleeved on the motor shaft (1) through the sleeve hole (211), and an internal thread capable of being screwed with the external thread on the outer peripheral wall of the motor shaft (1) being provided on an inner peripheral wall of the sleeve hole (211); A rotation direction of the internal thread on the inner peripheral wall of the sleeve hole (211) is the same as a rotation direction when the motor shaft (1) rotates forward to drive a pump body of a refrigerant pump to pump out a liquid refrigerant.

2. The oil brake assembly according to claim 1, wherein, Along an axial direction of the motor shaft (1), snap rings (11) are clamped on both sides of the motor shaft (1) opposite to the stirring shaft (21).

3. The oil brake assembly according to claim 2, wherein, The snap ring (11) is shaped like a C shape.

4. The oil brake assembly according to claim 2, wherein, An annular groove is provided on the outer peripheral wall of the motor shaft (1), and the snap ring (11) is clamped in the annular groove.

5. The oil brake assembly according to claim 1, characterized in that, The number of the stirring blades (22) is provided with a plurality, and the plurality of stirring blades (22) are distributed at intervals in a circumferential direction of the stirring shaft (21).

6. The oil brake assembly according to claim 1, wherein, The stirring blade (22) and the stirring shaft (21) are integrally formed.

7. The oil brake assembly according to claim 1, wherein, A fillet (23) is provided for transition connection between the stirring blade (22) and the stirring shaft (21).

8. A refrigerant pump, characterized in that, Comprising: A housing (3); A pump body (4), provided in the housing (3); The pump body (4) comprises a crankshaft; The oil brake assembly according to any one of claims 1-7, a first end of the motor shaft (1) being connected to the crankshaft.

9. The refrigerant pump according to claim 8, characterized in that, It further comprises a stator (5) and a rotor (6), the stator (5) being fixed in the housing (3), the rotor (6) being rotatably provided inside the stator (5), and a second end of the motor shaft (1) being fixedly connected to the rotor (6).

10. The refrigerant pump according to claim 9, wherein, Along the axial direction of the motor shaft (1), the stirring shaft (21) is located between the stator (5) and the pump body (4).

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