A dual-circulation cooling system for small-diameter electric spindles

Abstract

The invention discloses a dual-circulation cooling system for a small-diameter electric spindle, comprising a front-end bearing seat, a spindle housing and a rear-end bearing seat; the front-end bearing seat and the rear-end bearing seat are respectively connected to the front and rear ends of the spindle housing; a rear-end circulating water channel housing is embedded in the rear-end bearing seat, and the rear-end circulating water channel housing is provided with a cooling water inlet and a cooling water outlet; a front-end circulating water channel housing is embedded in the front-end bearing seat, and a water inlet channel and a water return channel are provided inside the spindle housing; the two ends of the water inlet channel correspond to the cooling water inlet and the front-end circulating water channel housing respectively, and the two ends of the water return channel correspond to the cooling water outlet and the front-end circulating water channel housing respectively; the water inlet channel and the water return channel are provided to increase the formation of cooling water flowing through the spindle housing and increase the flow rate of cooling water; the cooling water can be evenly distributed by arranging a plurality of water storage chambers to continuously rotate and supply water to the water inlet channel, so that a plurality of groups of water inlet channels evenly cool the spindle housing.

Description

Technical Field

[0001] The invention relates to the technical field of electric spindle cooling, and in particular to a double-circulation cooling system for a small-diameter electric spindle. Background Art

[0002] The electric spindle is a new technology that has emerged in the field of CNC machine tools, integrating the machine tool spindle with the spindle motor. The electric spindle includes the electric spindle itself and its accessories, including the electric spindle, high-frequency frequency conversion device, oil mist lubricator, cooling device, built-in encoder, tool changing device, etc. The rotor of the motor directly serves as the spindle of the machine tool. The housing of the spindle unit is the motor base, and cooperates with other components to realize the integration of the motor and the machine tool spindle. The electric spindle is also the main source of heat for the machine tool, so it is necessary to dissipate the heat of the electric spindle in a timely and effective manner, otherwise overheating and deformation will lead to reduced processing accuracy and even damage to the equipment. The heat dissipation of the electric spindle is mainly carried out by water cooling, and the current water cooling scheme generally adopts single-cycle cooling. For small-diameter electric spindles, the cooling water channel needs to be reduced in size accordingly, resulting in a reduction in cooling water flow and poor heat dissipation efficiency. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a dual-circulation cooling system for a small-diameter electric spindle, which can effectively increase the flow rate of cooling water on the basis of a small-sized cooling water channel, thereby improving the heat dissipation effect of the small-diameter electric spindle.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a dual-circulation cooling system for a small-diameter electric spindle, comprising a front-end bearing seat, a spindle housing and a rear-end bearing seat; the front-end bearing seat and the rear-end bearing seat are respectively connected to the front and rear ends of the spindle housing; the rear-end bearing seat is embedded with a rear-end circulating water channel housing, and the rear-end circulating water channel housing is provided with a cooling water inlet and a cooling water outlet; the front-end bearing seat is embedded with a front-end circulating water channel housing, and the spindle housing is provided with a water inlet channel and a water return channel; the two ends of the water inlet channel correspond to the cooling water inlet and the front-end circulating water channel housing, respectively, and the two ends of the return channel correspond to the cooling water outlet and the front-end circulating water channel housing, respectively.

[0005] Furthermore, the cooling water inlet and the cooling water outlet are connected to the cooling water holes on the inner wall of the rear end circulating water channel shell. The inner circle of the rear end circulating water channel shell is provided with a shaft body, and sealing baffles are evenly arranged in an annular direction on the circumference of the shaft body. Adjacent sealing baffles and the inner wall of the rear end circulating water channel shell form a water storage cavity together.

[0006] Furthermore, a plurality of cooling holes are circumferentially arranged on the inner wall of the rear end circulating water channel shell, and the cooling holes are connected to the water inlet channel; the cooling holes correspond to the water storage cavity.

[0007] Furthermore, a plurality of grooves are circumferentially arranged on the inner wall of the front-end circulating water channel housing, and the positions where the water inlet channel and the water return channel communicate with the front-end circulating water channel housing are arranged at the bottoms of the grooves.

[0008] Furthermore, a ring sealing plate is attached to the inner wall of the front end circulating water channel shell, and the ring sealing plate cover is arranged on the notch of the groove.

[0009] Beneficial effects: The dual-circulation cooling system for a small-diameter electric spindle of the present invention can effectively increase the flow of cooling water on the basis of a small-sized cooling water channel, and improve the heat dissipation effect of the small-diameter electric spindle, including but not limited to the following technical effects:

[0010] 1) Set up water inlet channel and water return channel to increase the flow of cooling water through the spindle housing and increase the flow of cooling water;

[0011] 2) By providing multiple water storage chambers that continuously rotate to supply water to the water inlet channel, the cooling water can be evenly distributed, so that the multiple groups of water inlet channels can evenly cool the spindle housing;

[0012] 3) Each water inlet channel is set to only inject water into the corresponding groove, so as to avoid convection caused by the combined action of multiple cooling water outlets, resulting in reduced circulation efficiency, and thus improve the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 is a side sectional view of the present invention;

[0014] Attached Figure 2 It is a structural diagram of the cooling water inlet and the cooling water outlet of the present invention;

[0015] Attached Figure 3 It is a structural diagram of the rear end circulating water channel housing of the present invention;

[0016] Attached Figure 4 It is a structural diagram of the front-end circulating water channel shell of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] As attached Figure 1-4: A dual-circulation cooling system for a small-diameter electric spindle, comprising a front-end bearing seat 1, a spindle housing 2 and a rear-end bearing seat 3; the front-end bearing seat 1 and the rear-end bearing seat 3 are respectively connected to the front and rear ends of the spindle housing 2; the rear-end bearing seat 3 is embedded with a rear-end circulating water channel housing 41, and the rear-end circulating water channel housing 41 is provided with a cooling water inlet 31 and a cooling water outlet 32; the front-end bearing seat 1 is embedded with a front-end circulating water channel housing 51, and the spindle housing 2 is provided with a water inlet channel 21 and a water return channel 52; the water inlet channel 21 The two ends correspond to the cooling water inlet 31 and the front-end circulating water channel shell 51 respectively, and the two ends of the return water channel 52 correspond to the cooling water outlet 32 ​​and the front-end circulating water channel shell 51 respectively; the cooling water enters the rear-end circulating water channel shell 41 from the cooling water inlet 31, and after convergence, enters the front-end circulating water channel shell 51 through the water inlet channel 21, and then flows back to the rear-end circulating water channel shell 41 through the return water channel 52 and is discharged through the cooling water outlet 32; the cooling water circulation stroke can be increased through the water inlet channel 21 and the return water channel 52, thereby increasing the overall cooling effect.

[0019] The cooling water inlet 31 and the cooling water outlet 32 ​​are connected to the cooling water hole 411 on the inner wall of the rear end circulating water channel shell 41. The inner circle of the rear end circulating water channel shell 41 is provided with a shaft body 42. The circumferential side of the shaft body 42 is evenly provided with sealing baffles 421. The adjacent sealing baffles 421 and the inner wall of the rear end circulating water channel shell 41 form a water storage cavity 422 together; as the shaft body 42 is driven to rotate by the power equipment, each water storage cavity 422 rotates along the inner wall of the rear end circulating water channel shell 41. When the water storage cavity 422 rotates to the position of the cooling water hole 411, the cooling water fills the water storage cavity 422. As the water storage cavity 422 rotates The cooling water in the cavity is sent to the cooling hole 43 and enters the water inlet channel 21. By setting up multiple water storage chambers 422 to continuously rotate and supply water to the water inlet channel 21, the cooling water can be evenly distributed, so that multiple groups of water inlet channels 21 can evenly cool the spindle housing 2; when the cooling water flows in the water inlet channel 21, the spindle housing 2 can be cooled at the same time, and then the cooling water enters the groove 53 of the front end circulating water channel housing 51. In the groove 53, due to the sealing effect of the annular sealing plate 511, the water inlet channel 21 only corresponds to the return water channel 52 in the groove 53, thereby avoiding the convection caused by the multiple water outlets of the cooling water, resulting in reduced circulation efficiency and poor heat dissipation effect.

[0020] A plurality of cooling holes 43 are circumferentially arranged on the inner wall of the rear end circulating water channel housing 41 . The cooling holes 43 are connected to the water inlet channel 21 . The cooling holes 43 correspond to the water storage cavity 422 .

[0021] The inner wall of the front circulating water channel housing 51 is circumferentially provided with a plurality of grooves 53 , and the positions where the water inlet channel 21 and the water return channel 52 communicate with the front circulating water channel housing 51 are arranged at the bottom of the grooves 53 .

[0022] An annular sealing plate 511 is attached to the inner wall of the front end circulating water channel housing 51 , and the annular sealing plate 511 covers the notch of the groove 53 .

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dual-circulation cooling system for a small-diameter electric spindle, characterized in that: The invention comprises a front end bearing seat (1), a main shaft housing (2) and a rear end bearing seat (3); the front end bearing seat (1) and the rear end bearing seat (3) are respectively connected to the front and rear ends of the main shaft housing (2); the rear end bearing seat (3) is embedded with a rear end circulating water channel housing (41), and the rear end circulating water channel housing (41) is provided with a cooling water inlet (31) and a cooling water outlet (32); the front end bearing seat (1) is embedded with a front end circulating water channel housing (51), and the main shaft housing (2) is provided with a water inlet channel (21) and a water return channel (52); the two ends of the water inlet channel (21) correspond to the cooling water inlet (31) and the front end circulating water channel housing (51), respectively, and the two ends of the water return channel (52) correspond to the cooling water outlet (32) and the front end circulating water channel housing (51); The cooling water inlet (31) and the cooling water outlet (32) are connected to the cooling water hole (411) on the inner wall of the rear end circulating water channel housing (41); the inner ring of the rear end circulating water channel housing (41) is provided with a shaft body (42); the shaft body (42) is evenly provided with sealing baffles (421) in an annular direction around the shaft body (42); adjacent sealing baffles (421) and the inner wall of the rear end circulating water channel housing (41) together form a water storage cavity (422); The inner wall of the front circulating water channel housing (51) is provided with a plurality of grooves (53) in an annular direction, and the positions where the water inlet channel (21) and the water return channel (52) communicate with the front circulating water channel housing (51) are arranged at the bottom of the grooves (53).

2. A dual-circulation cooling system for a small-diameter electric spindle according to claim 1, characterized in that: A plurality of cooling holes (43) are circumferentially arranged on the inner wall of the rear end circulating water channel housing (41); the cooling holes (43) are connected to the water inlet channel (21); and the cooling holes (43) correspond to the water storage chamber (422).

3. A dual-circulation cooling system for a small-diameter electric spindle according to claim 1, characterized in that: An annular sealing plate (511) is attached to the inner wall of the front end circulating water channel housing (51), and the annular sealing plate (511) covers the notch of the groove (53).

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