CN219639079U - Liquid cooling pump - Google Patents

Abstract

The utility model relates to the technical field of circulating pumps, in particular to a liquid cooling pump which comprises a cylinder body, wherein an interlayer channel for liquid to flow is formed in the cylinder wall of the cylinder body; the wall surface of the inner cavity of the cylinder is coaxially and fixedly connected with a stator, a main shaft is coaxially and rotatably arranged in the inner cavity of the cylinder, a rotor matched with the stator is arranged on the main shaft, and an overcurrent gap is formed between the stator and the rotor; the main shaft is also provided with an impeller for driving liquid to flow through the interlayer channel and the overflow gap; the utility model can effectively reduce the temperature inside the water pump, thereby avoiding the inside of the water pump from being in a high-temperature state and improving the working efficiency of the water pump.

Description

Liquid cooling pump

Technical Field

The utility model relates to the technical field of circulating pumps, in particular to a liquid cooling pump.

Background

The cooling mode of the water pump is mainly divided into air cooling and water cooling. The water cooling mode can enable the motor to output higher power under the same cost or enable the water pump material to be used less and lower in cost under the same output power, so that the water cooling type water pump has wide application.

The conventional water cooling mode is to provide a water cooling channel on the shell of the water pump, and make the fluid driven by the impeller continuously flow through the water cooling channel, so as to take away the heat generated by the water pump. The water cooling mode has a good heat dissipation effect, so that the water cooling mode is widely used, and the patent 201510240099.7 adopts the following specific structure: the motor power mechanism is fixed in the inner cylinder of the double-wall sleeve, and the centrifugal pump body is fixed in the bottom cylinder forming the double-wall sleeve and is coaxially connected with the motor power mechanism; the water inlet and the water outlet are respectively arranged on the outer wall of the double-wall sleeve body. ". The water cooling channel is formed in the water pump shell to be corresponding to the water pump for heat dissipation, so that the heat dissipation effect is good, but some technical problems occur in the long-term use process. Through temperature measuring device detection, it is found that the temperature on the surface layer of the water pump is obviously reduced, but the reduction of the internal temperature of the water pump is small, particularly in a high-power working state, the rotor and the stator in the water pump still heat seriously, the heat dissipation rate is extremely low, and the working efficiency of the water pump is seriously affected, so that the problem needs to be solved.

Disclosure of Invention

In order to avoid and overcome the technical problems in the prior art, the utility model provides a liquid cooling pump. The utility model can effectively reduce the temperature inside the water pump, thereby avoiding the inside of the water pump from being in a high-temperature state and improving the working efficiency of the water pump.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the liquid cooling pump comprises a cylinder body, wherein an interlayer channel for liquid to flow is formed in the cylinder wall of the cylinder body; the wall surface of the inner cavity of the cylinder is coaxially and fixedly connected with a stator, a main shaft is coaxially and rotatably arranged in the inner cavity of the cylinder, a rotor matched with the stator is arranged on the main shaft, and an overcurrent gap is formed between the stator and the rotor; the main shaft is also provided with an impeller for driving liquid to flow through the interlayer channel and the overflow gap.

As still further aspects of the utility model: the main shaft is arranged in the inner cavity of the cylinder body through a bearing, and the bearing comprises a front bearing assembly and a rear bearing assembly which are symmetrically arranged at two ends of the main shaft; the front bearing assembly comprises a front bearing sleeved at the front end of the main shaft, and the front bearing is fixedly connected to the end face of the cylinder body through a front bearing seat; and the front bearing seat and the rear bearing seat are respectively provided with a through-flow hole communicated with the through-flow gap.

As still further aspects of the utility model: the front end of the cylinder body is coaxially provided with a front end part, and the front end part is provided with an inlet for fluid inflow and communicated with the through-flow hole; guide vanes are coaxially arranged on the end face of the cylinder body, guide vanes are formed on the guide vanes, and guide channels communicated with the interlayer channels are formed by surrounding between adjacent guide vanes and the inner wall face of the front end part.

As still further aspects of the utility model: a limiting disc is coaxially and fixedly connected to one end, far away from the front bearing seat, of the rear bearing seat, and an annular rotating gap is formed between the limiting disc and the rear bearing seat in a surrounding manner; the rear end of the main shaft is connected with a thrust disc, the thrust disc is arranged in the rotating gap, and a fit gap is reserved between the thrust disc and the rear bearing seat as well as between the thrust disc and the limiting disc.

As still further aspects of the utility model: and the limiting disc is provided with a flow guide through hole, and the flow guide through hole, the rotating gap and the flow guide through hole are communicated with each other.

As still further aspects of the utility model: the interlayer channels are uniformly distributed on the cylinder body along the circumferential direction of the cylinder body.

As still further aspects of the utility model: the front end part and the cylinder body are in threaded connection with each other, an inlet sealing groove is formed in the threaded connection part, and an inlet sealing piece is arranged in the inlet sealing groove.

As still further aspects of the utility model: the rear end of the cylinder is coaxially connected with the rear end part in a threaded manner, an outlet sealing groove is formed in the threaded connection position, and an outlet sealing piece is arranged in the outlet sealing groove.

As still further aspects of the utility model: the rear end part is provided with an outlet, and the outlet is communicated with the flow guide through hole and the interlayer channel.

As still further aspects of the utility model: and the cylinder body is also provided with a wire outlet hole, and the wire outlet hole and the interlayer channel are mutually avoided.

Compared with the prior art, the utility model has the beneficial effects that:

1. the interlayer channel provided by the utility model can take away heat of the surface layer of the pump and cool the pump. The arrangement of the overcurrent clearance can enable liquid to flow between the rotor and the stator, so that heat generated in the pump is taken away, and the rotor and the stator are in a relatively stable temperature state, so that the working efficiency of the pump is improved. The pump is provided with cooling channels inside and outside, so that heat near the channels can be taken away when fluid flows through the channels. And under the condition of simultaneous heat dissipation inside and outside, the temperature difference inside and outside the pump can be reduced, the condition that the rotor or the stator is overheated and damaged due to overlarge temperature difference is avoided, and the operation safety of the pump is improved.

2. The bearing is a non-contact medium self-lubricating hydraulic floating bearing, and the higher the rotating speed of the rotor is, the stronger the rigidity of the bearing is. The high-speed rotation of the rotor is utilized to enable pumped medium to generate a high-pressure liquid film on a gap between the bearing and the main shaft, support the main shaft to suspend, and lubricate and cool the main shaft. The main shaft is suspended by the liquid, the bearing and the main shaft are lubricated and cooled, and the pump is cooled, so that the heat dissipation performance of the miniature self-cooling pump is greatly improved, the temperature rise of the pump is greatly reduced, and the long-time reliable operation of the pump is ensured.

3. When the impeller works, the front-back pressure difference of the impeller can generate an axial force, and the direction of the axial force is opposite to the direction of incoming flow; and the presence of this axial force may exacerbate the wear of the rear bearing. The guide vane and the front bearing seat are provided with through holes which are communicated with the overcurrent clearance; the main shaft is close to being equipped with the thrust disk on the liquid outlet end, is equipped with the spacing dish on the back bearing assembly, is equipped with a plurality of water conservancy diversion through-holes on the spacing dish, and each through-hole all communicates with the overflow clearance, consequently can make the fluid circulate along the overflow clearance, reduces the pressure differential of impeller department, and then can reduce axial force.

4. The thrust disk is located between rear bearing assembly and the limiting disk, has certain clearance between thrust disk and rear bearing frame and the limiting disk terminal surface. The main shaft rotates at a high speed to drive the thrust disc to rotate at a high speed, a layer of axial liquid film is generated between the gaps, the thrust disc axially floats through the axial liquid film, and the thrust disc is prevented from being in direct contact with the rear bearing seat and the limiting disc. Through the buffering of axial liquid film, balanced axial force has avoided trouble and the loss that the unbalanced axial force leads to, and axial liquid film has reduced the wearing and tearing between thrust disk and the back bearing frame simultaneously, has reduced the noise. The two end surfaces of the thrust disk are plated with titanium silicon, so that the hardness, the wear resistance and the corrosion resistance of the thrust disk are improved.

Drawings

Fig. 1 is a schematic view of the internal structure of the present utility model.

Fig. 2 is a schematic view of the structure of the bearing according to the present utility model.

Fig. 3 is a schematic structural view of a cylinder according to the present utility model.

In the figure:

10. a housing; 11. a cylinder; 111. the end face of the cylinder body; 112. a sandwich channel; 113. an inner cavity of the cylinder body; 114. a wire outlet hole; 12. a front end portion; 121. an inlet; 122. an inlet seal groove; 123. an inlet seal; 13. a rear end portion; 131. an outlet; 132. an outlet seal groove; 133. an outlet seal; 14. a guide vane; 15. a limiting disc; 20. a bearing; 21. a front bearing assembly; 211. a front bearing; 212. a front bearing seat; 22. a rear bearing assembly; 221. a rear bearing; 222. a rear bearing seat; 30. a drive assembly; 31. a main shaft; 32. an impeller; 33. a thrust plate; 34. a rotor; 35. a stator; 36. and an overcurrent gap.

Detailed Description

For a better understanding of the technical solution of the present utility model, the following detailed description of the embodiments of the present utility model refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the utility model. Embodiments of the utility model are described herein in terms of various specific embodiments, and all other embodiments, which are apparent to those of ordinary skill in the art to which the utility model pertains without inventive faculty.

The terminology used in the description of the embodiments of the utility model herein is for the purpose of describing particular embodiments of the utility model only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present utility model are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present utility model. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.

As shown in fig. 1, in the micro self-cooling pump of the present embodiment, a housing 10 is designed as three detachable parts including a cylinder 11, a front end 12 and a rear end 13, which are fixed together by screw connection. The housing 10 is designed in three separable parts to facilitate maintenance, cleaning and loading and unloading of the interior of the housing 10 by a user. An inlet 121 is formed in the axisymmetric center of the front end 12, and an inlet seal groove 122 which is not communicated with the inside of the cylinder 11 is formed in the surface of the front end 12 matched with the cylinder 11. An inlet seal 123 is provided in the inlet seal groove 122, and the inlet seal groove 122 and the inlet seal 123 can effectively prevent the leakage of the working fluid from the junction of the cylinder 11 and the front end portion 12. An outlet 131 is formed in the axisymmetric center of the rear end portion 13, and an outlet seal groove 132 which is not communicated with the inside of the cylinder 11 is formed in the surface of the rear end portion 13 matched with the cylinder 11. The outlet seal groove 132 is provided with an outlet seal 133, and the outlet seal groove 132 and the outlet seal 133 can effectively prevent the leakage of the working fluid from the junction of the cylinder 11 and the rear end portion 13.

In this embodiment, the cylinder 11 has a cylinder end face 111, a sandwich passage 112, a cylinder inner cavity 113, and a wire outlet hole 114. The bearing 20 is located in the cylinder cavity 113, wherein the front bearing assembly 21 is fixed on the guide vane 14 through a fixing piece, and the front bearing 211 and the front bearing seat 212 are integrally formed to form the front bearing assembly 21. The rear bearing assembly 22 is fixed on the end face of the cylinder 11 near the outlet 131 by a fixing member, and the rear bearing 221 and the rear bearing housing 222 are integrally formed to constitute the rear bearing assembly 22. The drive assembly 30 is located in the barrel interior 113 with the spindle 31 supported on the bearing 20, the impeller 32 secured to the end face of the spindle 31 adjacent the inlet 121, and the thrust disk 33 secured to the end face of the spindle 31 adjacent the outlet 131. The rotor 34 is coaxially mounted on the main shaft 31, and the stator 35 is fixed to the inner wall surface of the cylinder cavity 113. The guide vanes 14 are fixed to the cylinder end face 111 radially outside the impeller 32. The limiting plate 15 is fixed on the rear bearing seat 222, and the thrust plate 33 is located between the limiting plate 15 and the rear bearing seat 222.

After the power is turned on, a magnetic field is formed between the rotor 34 and the stator 35, the magnetic field acts on the rotor 34 to enable the main shaft 31 to rotate at a high speed, and then the impeller 32 is driven to rotate, so that the impeller 32 draws working liquid into the inlet 121, the impeller 32 applies work to the working liquid to increase the pressure of the liquid, the pressurized liquid passes through the guide vanes 14 arranged on the radial outer side of the impeller 32, the guide vanes 14 convert part of kinetic energy of the liquid into pressure energy, speed reduction and pressurization are realized, and then the liquid mainly flows to the outlet 131 through the interlayer channel 112 and the inner cavity 113 of the cylinder body, and the specific flow track is shown by an arrow in fig. 1.

In the above process, the working fluid that has entered the front end portion 12 is pressurized by the impeller 32, and therefore, a pressure difference exists between the front and rear sides of the impeller 32. In fig. 1, the left side of the impeller 32 is in front of the impeller, and has the pressure before pressurization, and the pressure is smaller; the impeller 32 has a pressure at the rear right side thereof after pressurization, and has a large pressure. This pressure difference will generate an axial force on the spindle 31, the direction of which is opposite to the direction of the incoming flow. The presence of this axial force may exacerbate wear of the rear bearing 221. If this axial force is not balanced, numerous quality and safety issues are presented to the operation of the miniature self-cooling pump.

To solve the above axial force problem, in each embodiment of the present utility model, a plurality of through holes are formed on the annular surfaces of the front bearing seat 212 and the guide vane 14, and the through holes connect the inlet 121 and the cylinder cavity 113, so that the working fluid leaks from the back of the impeller 32, and flows into the cylinder cavity 113 through the through holes to remove a part of the axial force. The back bearing seat 222 and the limiting disc 15 are respectively provided with a plurality of through holes on opposite annular surfaces, the through holes are connected with the cylinder inner cavity 113 and the outlet 131, liquid in the cylinder inner cavity 113 enters the back bearing seat 222 and the inside of the limiting disc 15 through the through holes, a certain gap is formed between the anti-thrust disc 33 and the end surfaces of the back bearing seat 222 and between the anti-thrust disc 33 and the limiting disc 15, the high-speed rotation of the main shaft 31 drives the anti-thrust disc 33 to rotate at a high speed, the anti-thrust disc 33 rotating at a high speed enables working liquid to generate a layer of axial high-pressure liquid film on the gap between the two end surfaces of the anti-thrust disc 33 and the back bearing seat 222 and the limiting disc 15, the residual axial force enables the main shaft 31 to move towards the inlet 121 along with the anti-thrust disc 33, the axial liquid film formed between the gaps enables the anti-thrust disc 33 to completely float axially, so that the anti-thrust disc 33 and the back bearing seat 222 cannot contact each other, a piece of axial force identical to the incoming flow direction is generated by virtue of buffering, the residual axial force is easily offset, and the technical effect of no and noise, and the front and back pressure difference generated axial force of the impeller 32 is balanced, and the fault and abrasion caused by the axial force imbalance and the axial force and abrasion caused by the axial force imbalance. Meanwhile, two end surfaces of the thrust disc 33 are plated with a layer of titanium silicon, so that the hardness, wear resistance and corrosion resistance of the thrust disc 33 are improved.

As shown in fig. 1, in the present embodiment, the bearing 20 is a non-contact medium self-lubricating hydraulic floating bearing, and the higher the rotational speed of the main shaft 31, the more rigid the bearing 20. The front bearing assembly 21 of the bearing 20 is integrally formed, and the front bearing 211 and the front bearing seat 212 are made into one part, so that the assembly process is simplified, and the assembly precision is improved. The rear bearing assembly 22 of the bearing 20 includes a rear bearing 221 and a rear bearing housing 222, and the rear bearing 221 and the rear bearing housing 222 are integrally formed.

The main shaft 31 is supported on the front bearing 211 and the rear bearing 221, during the operation of the canned motor pump, when the main shaft 31 rotates at a high speed, the working fluid entering the front end 12 and the cylinder cavity 113 flows through the gap between the front bearing 211 and the main shaft 31 and the gap between the rear bearing 221 and the main shaft 31, and the relative movement among the front bearing 211, the rear bearing 221 and the main shaft 31 generates a dynamic pressure effect, so that the working fluid generates a liquid film on the gap between the front bearing 211, the rear bearing 221 and the main shaft 31, the main shaft is radially suspended, the liquid film has high pressure and has good bearing capacity, and the front bearing 211 and the rear bearing 221 can achieve a self-lubricating effect. Thus, the whole miniature self-cooling pump does not need lubricating liquid, and the pollution of the lubricating liquid to working liquid is avoided; moreover, the whole micro self-cooling pump adopts a hydrodynamic lubrication mode, compared with solid lubrication, friction and heat are hardly generated, so that the micro self-cooling pump has smaller heat loss and longer service life, and can reach higher rotating speed to meet the requirement on the efficiency of the micro self-cooling pump.

As shown in fig. 1, 2 and 3, in the present embodiment, the inner circumferential surface of the front bearing 211 matching with the main shaft 31 is a cylindrical surface, and the outer circumferential surface of the main shaft 31 matching with the front bearing 211 is a radial bearing cylindrical surface. The outer peripheral surface of the main shaft 31 matched with the front bearing 211 is hardened, and the surface is sprayed with diamond-like carbon, so that a shaft sleeve is replaced, the fault caused by poor assembly precision between the shaft sleeve and the main shaft 31 is avoided, and meanwhile, the structure is simplified, and the whole pump structure is more compact. The front bearing 211 and the main shaft 31 are matched with each other, a molded line channel is formed in the inner peripheral surface of the front bearing, polytetrafluoroethylene is sprayed on the molded line channel, the channel is provided with an inlet and an outlet, no pressure difference is required on two sides, the front bearing can swing and float, the pressure on two sides can be automatically adjusted, when the driving assembly 30 rotates at a high speed, working liquid can be extruded to the center along the molded line channel, and the pressure difference generated by liquid compression in the channel enables the main shaft 31 to be suspended in the working liquid in the radial direction, so that the technical effects of no abrasion and no noise are achieved. The structure between the rear bearing 221 and the main shaft 31 is the same as that of the front bearing 211, and will not be described again here.

The rotating assembly 30 forms a driving motor structure, and the driving motor is a permanent magnet synchronous motor and is made into a waterproof structure. The rotor 34 is fixed through a shaft shoulder on the main shaft 31, the rotor 34 is tightly matched with the main shaft 31, the rotor 34 is completely covered by a rotor shielding sleeve, and the rotor shielding sleeve is fixed on the main shaft 31 through welding; the stator 35 is positioned on the radial outer side of the rotor 34 and fixed on the inner cavity 113 of the cylinder, after the stator 35 is tightly matched with the end face 111 of the cylinder, the wiring of the driving motor is led out from the wire outlet hole 114, and then resin material is poured into the wiring through a special die and vacuum filling and sealing equipment, so that the wiring of the driving motor is completely coated on the stator 35 and is adhered to the end face 111 of the cylinder, and the wiring of the stator 35 and the driving motor is prevented from being in direct contact with liquid; the resin material has good heat conducting property, can transfer heat generated by the coil of the driving motor into peripheral working liquid, greatly improves the heat radiating property of the driving motor, improves the output power of the driving motor, provides better insulativity and chemical medium resistance, increases the mechanical strength and the moistureproof capacity of the coil of the driving motor, reduces the vibration noise of the driving motor, and improves the reliability of the whole pump.

In the embodiment of the utility model, the driving motor is a high-speed motor, and the driving motor runs at a high speed to drive the impeller 32 to centrifugally boost pressure at a high speed. The speed of the high speed impeller is typically 3-5 times higher than that of a conventional centrifugal pump, the higher the rotational speed of the impeller 32, the smaller the impeller diameter required to achieve the same flow head, thus greatly reducing the volume of the miniature self-cooling pump.

In the embodiment of the present utility model, the end face of the cylinder 11 is provided with a plurality of arc grooves, and penetrates through the whole cylinder 11, such as the interlayer channel 112 shown in fig. 1. A through hole is processed between the interlayer channel 112 and the inner cavity 113 of the cylinder body at one end of the interlayer channel 112 near the inlet 121, and working fluid between the interlayer channel 112 and the inner cavity 113 of the cylinder body is connected; a through hole is also formed between the interlayer channel 112 and the cylinder cavity 113 at the end of the interlayer channel 112 near the outlet 131, and connects the working fluid between the cylinder cavity 113 and the interlayer channel 112. As shown in fig. 1, a solid portion of the cylinder 1, which is not provided with an arc-shaped groove, is provided with a wire outlet 114, which communicates the inner cavity 113 of the cylinder with the outside of the housing 10, and the wire of the driving motor can be led out before the encapsulation of the stator 35, and the wire outlet is filled with resin material after the encapsulation, thereby being insulating and waterproof.

After the working liquid is pressurized by the impeller 32, the main flow passes through the speed-reducing pressurization of the guide vane 14 and flows from the interlayer channel 112 to the outlet 131, wherein a small part of the liquid flows into the space on the left side of the cylinder cavity 113 from the through hole between the interlayer channel 112 and the cylinder cavity 113, which is close to the inlet 121; in addition to the main flow, some liquid leaks from the back of the impeller, one of which flows into the left space of the inner cavity 113 of the cylinder through the front bearing seat 212 and the through holes on the guide vanes 14, and the other liquid flows into the left space of the inner cavity 113 of the cylinder through the radial gap between the front bearing 211 and the main shaft 31; after the liquid in the left space of the cylinder cavity 113 converges, the liquid flows into the right space of the cylinder cavity 113 through the annular flow channel between the rotor 34 and the stator 35, at this time, most of the liquid flows to the outlet 131 through the through holes on the rear bearing seat 222 and the limiting disc 15 and the radial gap between the rear bearing 221 and the main shaft 31, and the rest of the liquid flows into the interlayer channel 112 through the through holes between the cylinder cavity 113 and the interlayer channel 112, which are close to the outlet 131, and the main flow is converged to the outlet 131. As indicated by the arrow in fig. 1.

In some embodiments of the present utility model, the working liquid fills each gap, the drive motor is completely covered by the liquid, and the flowing liquid well takes away the heat generated by the drive motor without worrying about damage to the drive motor due to excessive temperature rise.

The foregoing description is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical solution of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (10)

1. The liquid cooling pump is characterized by comprising a cylinder (11), wherein an interlayer channel (112) for liquid to flow is formed in the cylinder wall of the cylinder (11); a stator (35) is coaxially fixedly connected on the wall surface of the inner cavity (113) of the cylinder, a main shaft (31) is coaxially rotatably arranged in the inner cavity (113) of the cylinder, a rotor (34) matched with the stator (35) is arranged on the main shaft (31), and an overcurrent gap (36) is formed between the stator (35) and the rotor (34); the main shaft (31) is also provided with an impeller (32) for driving liquid to flow through the interlayer channel (112) and the overflow gap (36).

2. A liquid-cooled cooling pump according to claim 1, characterized in that the main shaft (31) is mounted in the cylinder cavity (113) by means of bearings (20), the bearings (20) comprising front bearing assemblies (21) and rear bearing assemblies (22) symmetrically mounted at both ends of the main shaft (31); the front bearing assembly (21) comprises a front bearing (211) sleeved at the front end of the main shaft (31), and the front bearing (211) is fixedly connected to the end face (111) of the cylinder body through a front bearing seat (212); and the front bearing seat (212) and the rear bearing seat (222) are respectively provided with a through-flow hole communicated with the through-flow gap (36).

3. The liquid cooling pump according to claim 2, wherein a front end portion (12) is coaxially mounted at the front end of the cylinder (11), and an inlet (121) through which fluid flows and which communicates with the through-flow hole is formed in the front end portion (12); guide vanes (14) are coaxially arranged on the end face (111) of the cylinder, guide vanes are formed on the guide vanes (14), and guide channels communicated with the interlayer channels (112) are formed by surrounding the adjacent guide vanes and the inner wall surface of the front end part (12); the guide vane (14) is provided with a guide vane through hole communicated with the through hole.

4. A liquid cooling pump according to claim 3, wherein one end of the rear bearing seat (222) far away from the front bearing seat (212) is coaxially and fixedly connected with a limiting disc (15), and an annular rotating gap is formed between the limiting disc (15) and the rear bearing seat (222); the rear end of the main shaft (31) is connected with a thrust disc (33), the thrust disc (33) is arranged in the rotation gap, and a fit gap is reserved between the thrust disc (33) and the rear bearing seat (222) and between the thrust disc and the limit disc (15).

5. The liquid cooling pump as claimed in claim 4, wherein the limiting plate (15) is provided with a flow guiding through hole, and the flow guiding through hole, the rotation gap and the flow guiding through hole are communicated with each other.

6. A liquid-cooled cooling pump according to claim 5, characterized in that the sandwich channels (112) are uniformly distributed on the cylinder (11) along the circumference of the cylinder (11).

7. A liquid cooling pump according to claim 3, wherein the front end portion (12) and the cylinder (11) are in threaded connection with each other, an inlet seal groove (122) is formed at the threaded connection, and an inlet seal (123) is installed in the inlet seal groove (122).

8. The liquid cooling pump as claimed in claim 7, wherein the rear end of the cylinder (11) is coaxially screwed with the rear end (13), and an outlet seal groove (132) is formed at the screwed connection, and an outlet seal (133) is installed in the outlet seal groove (132).

9. A liquid-cooled cooling pump according to claim 8, characterized in that the rear end portion (13) is provided with an outlet (131), the outlet (131) and the through-flow-guiding holes and the sandwich channel (112) being in communication with each other.

10. The liquid cooling pump as claimed in claim 7, wherein the cylinder (11) is further provided with a wire outlet hole (114), and the wire outlet hole (114) and the interlayer channel (112) are mutually avoided.