CN214118494U - Cooling water pump capable of realizing accurate flow control through variable rotating speed - Google Patents

Abstract

The utility model relates to the technical field of electronic water pumps, and discloses a cooling water pump with variable rotating speed and accurate flow control, which comprises a water pump component and a motor component, wherein the water pump component comprises a water pump body, and an internal circulation outlet is arranged on the water pump body; the water pump body is provided with a cooling chamber; an internal circulation water channel is arranged in the water pump body, one end of the internal circulation water channel is communicated with the internal circulation outlet, and the other end of the internal circulation water channel is opened on the inner wall surface of the cooling chamber to form an internal circulation water inlet; the cooling chamber is also provided with an internal circulation water return port; the motor assembly comprises a motor shell, and one end of the motor shell extends into the cooling chamber; a cooling groove is formed in the outer wall of the motor shell, and a closed cooling cavity is formed by the inner wall surface of the cooling chamber and the cooling groove; and water in the vortex chamber flows into the internal circulation water channel from the internal circulation outlet, enters the cooling cavity from the internal circulation water inlet, and finally flows back to the vortex chamber through the internal circulation water return port. The cooling water pump is compact and reasonable in structure, and the cooling cavity is arranged between the water pump body and the motor shell to cool the motor assembly, so that self-cooling is realized, and the cooling water pump is energy-saving and environment-friendly.

Description

Cooling water pump capable of realizing accurate flow control through variable rotating speed

Technical Field

The utility model relates to a water pump technical field especially indicates a variable rotational speed realizes cooling water pump of accurate control flow.

Background

With the high-speed development of new energy automobiles, the requirements on automobile parts are higher and higher, and automobile electronic water pumps play an important role in new energy electric automobiles. However, when the water pump works, the motor assembly can generate a large amount of heat, and the heat can affect the normal operation of each part of the electronic water pump if the water pump is not discharged in time, so that the service life of the electronic water pump of the automobile is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model provides a variable rotational speed realizes cooling water pump of accurate control flow, compact structure, reasonable can realize self-cooling, energy-concerving and environment-protective.

The technical scheme of the utility model is realized like this: a cooling water pump with variable rotating speed and accurate flow control comprises a water pump component and a motor component,

the water pump component at least comprises a water pump body, and an internal circulation outlet is arranged on the water pump body at the position corresponding to the water outlet of the volute; the water pump body is provided with a cooling chamber; an internal circulation water channel is arranged in the water pump body, one end of the internal circulation water channel is communicated with the internal circulation outlet, and the other end of the internal circulation water channel is opened on the inner wall surface of the cooling chamber to form an internal circulation water inlet; the cooling chamber is also provided with an internal circulation water return port;

the motor assembly at least comprises a motor shell, and one end of the motor shell extends into the cooling chamber; an inwards concave cooling groove is formed in the outer wall of the motor shell positioned in the cooling chamber, and a closed cooling cavity is formed by the inner wall surface of the cooling chamber and the cooling groove;

and water in the vortex chamber flows into the internal circulation water channel from the internal circulation outlet, enters the cooling cavity from the internal circulation water inlet, and finally flows back to the vortex chamber through the internal circulation water return port.

Preferably, the water pump body comprises

The cooling chamber is arranged on the motor connecting part;

the flange connecting part is used for connecting with the volute; the motor connecting part and the volute are respectively positioned on two opposite sides of the flange connecting part, and the motor connecting part and the flange connecting part are of an integrated structure;

the side surface of the flange connecting part facing the volute is provided with an inwards concave water chamber; the flange connecting part is provided with a bearing seat which is positioned in the cooling chamber; the flange connecting part is arranged on the bearing seat and comprises a through hole used for installing the driving shaft, and the through hole penetrates through the bearing seat and the flange connecting part.

As a preferred technical scheme, an annular water retaining platform is arranged on the bottom surface of the water chamber, and the through hole is positioned on the inner side of the water retaining platform.

According to the preferable technical scheme, the through hole comprises a bearing mounting hole and a water seal mounting hole, and the water seal mounting hole is arranged close to the water retaining platform; the aperture of the bearing mounting hole is smaller than that of the water seal mounting hole, and one end of the water seal mounting hole, which is far away from the bearing mounting hole, is trumpet-shaped.

As the preferred technical scheme, the motor connecting part is also provided with a water drainage hole, the water drainage hole is communicated with the water seal mounting hole, and the communication position is close to the bearing mounting hole.

As a preferred technical scheme, a water outlet guide table is arranged on the water chamber corresponding to the position of the water outlet of the volute, the side surface of the water outlet guide table facing to the water flow is a guide surface, and the guide surface is an arc surface; the internal circulation outlet is provided on the guide surface.

As the preferred technical scheme, the system also comprises a water pump temperature sensor for detecting the water temperature and a motor temperature sensor for detecting the motor temperature; the water pump temperature sensor is fixed on the guide surface of the water outlet guide table.

As the preferred technical scheme, a water flow guide table is spirally arranged on the bottom wall of the cooling tank; gaps are reserved between the two ends of the water flow guide table and the side wall of the cooling tank, and a water inlet space and a water outlet space are formed at the two ends of the water flow guide table; the water inlet space corresponds to the position of the internal circulation water inlet, and the water outlet space corresponds to the position of the internal circulation water return port.

As an optimized technical scheme, a first sealing groove and a second sealing groove are respectively arranged at two ends of the cooling groove, and sealing rings are placed in the first sealing groove and the second sealing groove to seal the cooling cavity.

The beneficial effects of the utility model reside in that: the cooling water pump is compact and reasonable in structure, and a cooling cavity is arranged between the water pump body and the motor shell to cool the motor assembly, so that self-cooling can be realized, energy is saved, and the environment is protected; the motor is cooled by the inner circulation of the motor while the outer circulation is met through ingenious design.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic view of a first view structure of the present invention;

fig. 2 is a schematic view of a second perspective structure of the present invention;

fig. 3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic view of the connection structure between the spiral casing and the present invention;

FIG. 5 is a schematic structural view of the water pump body;

FIG. 6 is a schematic perspective view of the water pump body;

FIG. 7 is a schematic structural view of an internal circulation water inlet channel;

fig. 8 is a schematic view of a third view structure of the present invention;

FIG. 9 is a schematic structural view of a motor casing;

FIG. 10 is a front view of the motor casing;

fig. 11 is a sectional view of the motor case.

In the figure, the position of the upper end of the main shaft,

1-a water pump assembly; 11-a water pump body; 111-flange connection; 112-motor connection; 113-sensor mounting holes; 114-a water retaining table; 115-water chamber; 116-a weep hole; 117-bearing seats; 118-a cooling chamber; 119-an internal circulation water inlet; 120-water seal mounting holes; 121-bearing mounting holes; 122-an effluent guide table; 123-internal circulation outlet; 124-ribs; 125-internal circulation water return port; 126-internal circulation water inlet channel; 12-an impeller; 13-a drive shaft; 14-water sealing;

2-a motor assembly; 21-motor casing; 211-an insertion portion; 212-external wiring portion; 213-first seal groove; 214-a second seal groove; 215-shoulder; a 216-wire hole; 217-stator positioning stage; 218-a water flow directing table; 219-water entry space; 220-water outlet space; 221-a cooling tank; 22-motor end cap; 23-a rotor; 24-a vent valve; 25-a stator;

3-connecting bolts;

4-a volute; 41-internal circulation interface; 42-large circulation water inlet; 43-large circulation water outlet;

5-cooling chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and the descriptions of these embodiments are used to help understanding the present invention, but do not constitute a limitation of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

A cooling water pump capable of realizing accurate flow control by changing rotating speed is shown in figures 1, 2, 3 and 4 and comprises a water pump assembly 1, a motor assembly 2 and a connecting bolt 3, wherein the water pump assembly 1 and the motor assembly 2 are fixedly connected through the connecting bolt 3. Still include water pump temperature sensor and motor temperature sensor, water pump temperature sensor and motor temperature sensor are prior art, and the figure is not shown. The water pump assembly 1 is fixedly connected with the volute 4, a large circulation water inlet 42 of the volute 4 tangentially feeds water, and a large circulation water outlet 43 outputs water in a direction parallel to the axial direction of the impeller 12.

The water pump assembly comprises a water pump body 11, a driving shaft 13, a water seal 14 and an impeller 12.

As shown in fig. 5, 6, 7 and 8, the water pump body 11 includes a flange connection portion 111 and a motor connection portion 112, and the flange connection portion 111 and the motor connection portion 112 are of an integral structure.

The flange connection portion 111 is disc-shaped, two opposite side surfaces are respectively connected with the volute 4 and the motor assembly, the side surface connected with the volute 4 is set as a volute connection surface, and the side surface connected with the motor assembly 2 is set as a motor connection surface.

The motor connecting part 112 is positioned on the motor connecting surface of the flange connecting part 111, a bearing seat 117 is arranged on the motor connecting surface of the flange connecting part 111, a cooling chamber 118 is arranged in the motor connecting part 112, and the bearing seat 117 is positioned in the cooling chamber 118; an end of the cooling chamber 118 remote from the flange connection portion 111 is open for connection with the motor case 21. The inner side wall of the cooling chamber 118 is provided with a plurality of limiting shoulders for connecting and limiting the motor casing 21. As shown in fig. 5 and 7, two annular stop shoulders are provided in the cooling chamber 118.

The volute connecting surface of the flange connecting portion 111 is provided with an inward water chamber 115, and the flange connecting portion 111 is further provided with a through hole for mounting the driving shaft 13. The through hole penetrates the bearing housing 117 and the flange connection portion 111, i.e., the through hole opens at one end into the cooling chamber 118 and at the other end into the water chamber 115. An annular water retaining platform 114 is arranged on the bottom surface of the water chamber 115, and the through hole is located on the inner side of the water retaining platform 114. As shown in fig. 5, the through-holes include a bearing mounting hole 121 and a water seal mounting hole 120, and the water seal mounting hole 120 is disposed adjacent to the water stop 114. The aperture of the bearing mounting hole 121 is smaller than that of the water seal mounting hole 120, and the end of the water seal mounting hole 120 far away from the bearing mounting hole 121 is horn-shaped, so that the water seal 14 can be conveniently mounted.

The drive shaft 13 may be a shaft coupling bearing for a water pump, or may be a common shaft for transmission as long as the power of the motor can be transmitted to the impeller 12. The driving shaft 13 is positioned in the through hole and rotatably mounted on the water pump body 11, and two ends of the driving shaft 13 are respectively positioned at two sides of the flange connecting part 111, namely one end passes through the water seal mounting hole 120 and is fixedly connected with the impeller 12; the other end extends into the cooling chamber 118 and is connected to the motor assembly 2. The water seal 14 is positioned in the water seal mounting hole 120 and is sleeved outside the driving shaft 13.

The water chamber 115 corresponding to the water outlet of the volute 4 is provided with a water outlet guide table 122, the side surface of the water outlet guide table 122 facing the water flow is a guide surface, and the guide surface is an arc surface. The water flow in the water chamber 115 moves in a curved manner in the water chamber 115 under the action of the impeller 12, the water outlet direction is perpendicular to the volute connecting surface, and the water outlet guide table 122 can buffer the water flow and guide the water outlet. The guide surface of the water outlet guide table 122 is provided with a sensor mounting hole 113 and an internal circulation outlet 123, and the sensor mounting hole 113 is a through hole, penetrates through the flange connecting part 111, and is used for mounting a water pump temperature sensor.

An internal circulation water inlet channel 126 is arranged in the water pump body 11, specifically, a rib 124 is arranged on the water pump body 11, and the internal circulation water inlet channel 126 is positioned in the rib 124. One end of the internal circulation water inlet channel 126 is communicated with the internal circulation outlet 123, and the other end of the internal circulation water inlet channel 126 is opened on the inner wall of the cooling chamber 118 to form an internal circulation water inlet 119. The motor connecting part 112 is further provided with an internal circulation water return port 125 and a water drainage hole 116, the internal circulation water return port 125 is positioned on the side wall of the cooling chamber 118 and is communicated with the internal circulation interface 41 of the volute through a water pipe to form a cooling circulation to cool the motor component 2, so that the service life of the motor is prolonged; the water drainage hole 116 is communicated with the water seal mounting hole 120, and the communication position is located between the water seal 14 and the bearing. The water drainage hole 116 is used for monitoring whether the water seal 14 leaks water, if the water seal 14 leaks water, water flows out of the water drainage hole 6, and if the water drainage hole 116 is detected to have water flowing out, the electronic water pump needs to be maintained or replaced in time.

Preferably, the internal circulation water inlet 119 is located at one end of the motor connecting portion 112, which is far away from the flange connecting portion 111, the internal circulation water return port 125 is close to the water chamber 115, high-pressure water is directly delivered to one end of the motor connecting portion 112, which is far away from the water chamber 115, low-pressure water after cooling the motor assembly 2 is returned to the water chamber 115 again, and self-circulation cooling and temperature reduction are realized by utilizing a water pressure difference between the internal circulation water inlet 119 and the internal circulation water return port 125.

The motor assembly 2 comprises a motor shell 21, a stator 25, a rotor 23, a connecting wire 3, a motor end cover 22 and a ventilation valve 24. Stator 25 is fixed on drive shaft 13, and stator 25 is connected with motor casing 21 interference fit, and breather valve 24 sets up on motor end cover 22, and motor end cover 22 then seals the one end of motor casing 21. The motor end cover 22 is provided with a vent valve 24, so that the temperature of the air in the motor can be raised when the motor works, and the balance of the internal air pressure and the external air pressure can be ensured by adding the vent valve 24; if gas cannot be removed in time, after the engine is cooled, water stain is generated, and the water stain enters between the stator 25 and the rotor 23 to possibly cause short circuit, so that the water pump is in failure.

As shown in fig. 9, 10 and 11, the motor case 21 is cylindrical with both ends open, and includes an insertion portion 211 to be inserted into the water pump body 11 and an external wiring portion 212.

The outer wire portion 212 is provided with a plurality of wire holes 216 through which wires pass. As shown in fig. 9 and 10, the external connection portion is provided with four wire holes 216 for connecting the three-phase wires and the motor temperature sensor lines, respectively.

The insert part 211 is provided with an inwardly concave cooling groove 221, and the cooling groove 221 and the inner wall of the cooling chamber 118 cooperate to form a cooling cavity 5. As shown in fig. 7, the water in the vortex chamber flows into the internal circulation water passage 126 from the internal circulation outlet 123, enters the cooling chamber 5 from the internal circulation water inlet 119, and finally flows back to the vortex chamber through the internal circulation water return port 125. The cooling liquid in the engine circulates, so that the motor can be rapidly cooled, and the cooling performance of the motor cannot be weakened.

The bottom wall of the cooling tank 221 is spirally provided with a water flow guide table 218, which can increase the flow of water flow in the cooling cavity 5 and improve the heat exchange effect between water and the motor. A gap is reserved between the two ends of the water flow guide platform 218 and the side wall of the cooling groove 221, that is, the end of the water flow guide platform 218 is not connected with the side wall of the cooling groove 221, so that a water inlet space 219 and a water outlet space 220 with larger width than the thread pitch of the water flow guide platform 218 exist at the two ends of the water flow guide platform 218, the water inlet space 219 corresponds to the position of the internal circulation water inlet 119 on the water pump body 11, and the water outlet space 220 corresponds to the position of the internal circulation water return 125 on the water pump body 11. Most preferably, the distance L1 between the end of the water flow directing table 218 and the side wall of the cooling bath 221 is 4.5 mm; the pitch L3 of the water guide table 218 is 7 mm; the height L2 of the water flow guide table 218 relative to the bottom wall of the cooling bath 221 is 3.5 mm.

After the insertion portion 211 is inserted into the water pump body 11 and assembled, the inner wall of the water pump body 11 is attached to the outer side surface of the water flow guide table 218, a spiral cooling water channel is formed between the water pump body 11 and the insertion portion 211, and when the electronic water pump is operated, circulating water is continuously supplied into the cooling water channel to cool the motor.

The insertion portion 211 is provided with at least a first seal groove 213 and a second seal groove 214, and the first seal groove 213 and the second seal groove 214 are located at both ends of the cooling groove 221, respectively. Sealing rings are placed in the first and second seal grooves 213 and 214, and a sealed cooling chamber 5 is formed between the two sealing rings, the water pump body 11, and the insert portion 211.

The end of the insertion portion 211 remote from the external connection portion 212 is provided with a shoulder 215, the outer diameter of the shoulder 215 is smaller than the outer diameter of the water flow guide step 218, and a positioning surface for mounting is formed at the shoulder 215. The inner cavity of the insertion part 211 is provided with a stator mounting cavity for fixedly connecting with a stator, and the inner wall of the shaft shoulder 215 is provided with a stator positioning table 217.

Motor casing 21 is inside to be equipped with motor temperature sensor, can be through controller real-time supervision temperature and make the feedback, in case take place unusually, is equipped with protection device on the controller, avoids high temperature to cause work unusual. The motor casing 21 and the stator 25 are simple to assemble and easy to operate, the assembling time is shortened, the working efficiency is improved, and the research and development period is correspondingly shortened. A three-phase alternating current motor is placed in the motor shell 21, so that the gap between the stator 25 and the rotor 23 is smaller, and the efficiency is higher; and the rotor 23 is provided with a limit ring, so that the work is more reliable. The pump structure is integrated more strongly, and the safety can be reflected more highly by the side face. The cooling water pump can meet the cooling requirement of the engine. The engine ECU receives a coolant temperature signal, the ECU sends motor frequency with pre-calibrated temperature to the controller, the controller controls the motor to rotate, the electronic rotor is linked with the impeller to stir the coolant to realize temperature cooling, and when the coolant temperature reaches a certain set value, the coolant temperature is fed back to the ECU, and the operation is repeated. The rotation of the linkage bearing and the impeller is realized by accurately controlling the rotating speed of the motor, so that the flow change under different rotating speeds is realized; according to the temperature requirement of the engine, the rotating speed of the motor is accurately controlled, and the liquid is accurately and quantitatively conveyed.

The cooling water pump is electrically driven, does not occupy the power output by a crankshaft when in work, and can directly reduce the power output provided by an engine when the original mechanical pump is used; the output power of the engine is saved; the engine warm-up time is shortened, the energy is saved, the environment is protected, and the oil is saved by 3.5 percent. The generator mainly consumes redundant electric energy of the generator, and waste is reduced; the transmission of a belt pulley is eliminated, larger radial force received by the original mechanical pump during working is eliminated, the service life of the bearing can be prolonged, the installation space of an engine can be optimized, and the mechanical pump is compact in structure, small in size and light in weight. The stepless speed regulation control of the water pump is realized after the motor is adopted for driving, the noise is very low during the work, the noise is obviously lighter than that of a mechanical pump, and the vibration and the impact force are reduced. The motor is cooled by the inner circulation of the motor while the outer circulation is met through the ingenious design; and simultaneously, the installation space of the engine can be optimized.

The cooling water pump capable of changing the rotating speed to realize accurate flow control has reliable performance, no abrasion, low failure rate and long service life; strong electromagnetic compatibility and stable performance.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a cooling water pump of accurate control flow is realized to variable rotational speed, includes water pump assembly (1) and motor element (2), its characterized in that:

the water pump assembly (1) at least comprises a water pump body (11), and an internal circulation outlet (123) is arranged on the water pump body (11) corresponding to the position of the water outlet of the volute (6); the water pump body (11) is provided with a cooling chamber (118); an internal circulation water channel (126) is arranged in the water pump body (11), one end of the internal circulation water channel (126) is communicated with the internal circulation outlet (123), and the other end of the internal circulation water channel is opened on the inner wall surface of the cooling chamber (118) to form an internal circulation water inlet (119); the cooling chamber (118) is also provided with an internal circulation water return port (125);

the motor component (2) at least comprises a motor shell (21), and one end of the motor shell (21) extends into the cooling chamber (118); an inwards concave cooling groove (221) is formed in the outer wall of the motor shell (21) positioned in the cooling chamber (118), and a closed cooling cavity is formed by the inner wall surface of the cooling chamber (118) and the cooling groove (221);

water in the vortex chamber flows into an internal circulation water channel (126) from an internal circulation outlet (123), enters the cooling cavity from an internal circulation water inlet (119), and finally flows back to the vortex chamber through an internal circulation water return port (125).

2. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 1, characterized in that: the water pump body (11) comprises

A motor connecting part (112), wherein a cooling chamber (118) is arranged on the motor connecting part (112);

and a flange connection portion (111) for connection with the volute (6); the motor connecting part (112) and the volute (6) are respectively positioned at two opposite sides of the flange connecting part (111), and the motor connecting part (112) and the flange connecting part (111) are of an integrated structure;

an inwards concave water chamber (115) is arranged on the side surface, facing the volute, of the flange connecting part (111); a bearing seat (117) is arranged on the flange connecting part (111), and the bearing seat (117) is positioned in the cooling chamber (118); the driving shaft is further provided with a through hole for mounting the driving shaft, and the through hole penetrates through the bearing seat (117) and the flange connecting part (111).

3. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 2, characterized in that: an annular water retaining platform (114) is arranged on the bottom surface of the water chamber (115), and the through hole is positioned on the inner side of the water retaining platform (114).

4. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 3, characterized in that: the through hole comprises a bearing mounting hole (121) and a water seal mounting hole (120), and the water seal mounting hole (120) is arranged close to the water blocking platform (114); the aperture of the bearing mounting hole (121) is smaller than that of the water seal mounting hole (120), and one end, far away from the bearing mounting hole (121), of the water seal mounting hole (120) is horn-shaped.

5. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 4, characterized in that: the motor connecting part (112) is further provided with a water drainage hole (116), the water drainage hole (116) is communicated with the water seal mounting hole (120), and the communication position is close to the bearing mounting hole (121).

6. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 1, characterized in that: a water outlet guide table (122) is arranged on the water chamber (115) corresponding to the position of the water outlet of the volute (6), the side surface of the water outlet guide table (122) facing the water flow is a guide surface, and the guide surface is an arc surface; an internal circulation outlet (123) is provided on the guide surface.

7. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 6, characterized in that: the water pump temperature sensor is used for detecting the water temperature, and the motor temperature sensor is used for detecting the motor temperature; the water pump temperature sensor is fixed on the guide surface of the water outlet guide table (122).

8. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 1, characterized in that: a water flow guide table (218) is spirally arranged on the bottom wall of the cooling groove (221); gaps are reserved between two ends of the water flow guide table (218) and the side wall of the cooling groove (221), and a water inlet space (219) and a water outlet space (220) are formed at two ends of the water flow guide table (218); the water inlet space (219) corresponds to the position of the internal circulation water inlet (119), and the water outlet space (220) corresponds to the position of the internal circulation water return port (125).

9. The cooling water pump capable of realizing accurate flow control at variable rotating speed according to claim 1, characterized in that: and a first sealing groove (213) and a second sealing groove (214) are respectively arranged at two ends of the cooling groove (221), and sealing rings are placed in the first sealing groove (213) and the second sealing groove (214) to seal the cooling cavity.

Images