A cooling water pump with variable speed for precisely controlling flow rate and its assembly process

Abstract

The present invention relates to the technical field of electronic water pumps, and discloses a cooling water pump capable of achieving precise flow control with variable speed and its assembly process, including a water pump assembly and a motor assembly. The water pump assembly includes a water pump body, and an inner circulation outlet is provided on the water pump body; a cooling chamber is provided in the water pump body; an inner circulation water channel is provided in the water pump body, one end of the inner circulation water channel is communicated with the inner circulation outlet, and the other end opens on the inner wall surface of the cooling chamber to form an inner circulation water inlet; an inner circulation water return port is also provided in the cooling chamber; the motor assembly includes a motor housing, and one end of the motor housing extends into the cooling chamber; cooling grooves are provided on the outer wall of the motor housing, and a closed cooling cavity is formed between the inner wall surface of the cooling chamber and the cooling grooves; the water in the volute chamber flows into the inner circulation water channel from the inner circulation outlet, enters the cooling cavity from the inner circulation water inlet, and finally flows back to the volute chamber through the inner circulation water return port. The water pump has a compact and reasonable structure. A cooling cavity is provided between the water pump body and the motor housing to cool the motor assembly, achieving self-cooling, energy conservation and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, and particularly to a cooling water pump with variable speed for precise flow control and its assembly process. Background Art

[0002] With the rapid development of new energy vehicles, the requirements for automotive components are getting higher and higher. Automotive electronic water pumps play an important role in new energy electric vehicles. However, when the water pump is working, the motor assembly generates a large amount of heat. If the heat is not discharged from the water pump in time, it will affect the normal operation of each component of the electronic water pump, thereby reducing the service life of the automotive electronic water pump. Summary of the Invention

[0003] The present invention provides a cooling water pump with variable speed for precise flow control, which has a compact and reasonable structure, can achieve self-cooling and temperature reduction, and is energy-saving and environmentally friendly.

[0004] The technical solution of the present invention is realized as follows: A cooling water pump with variable speed for precise flow control includes a water pump assembly and a motor assembly.

[0005] The water pump assembly at least includes a water pump body. An inner circulation outlet is provided on the water pump body corresponding to the position of the volute outlet; the water pump body is provided with a cooling chamber; an inner circulation water channel is provided in the water pump body. One end of the inner circulation water channel is communicated with the inner circulation outlet, and the other end opens on the inner wall surface of the cooling chamber to form an inner circulation water inlet; the cooling chamber is also provided with an inner circulation water return port.

[0006] The motor assembly at least includes a motor housing. One end of the motor housing extends into the cooling chamber; on the outer wall of the motor housing located in the cooling chamber, there is an inwardly concave cooling groove, and the inner wall surface of the cooling chamber and the cooling groove form a closed cooling cavity.

[0007] The water in the volute chamber flows into the inner circulation water channel from the inner circulation outlet, enters the cooling cavity from the inner circulation water inlet, and finally flows back to the volute chamber through the inner circulation water return port.

[0008] As a preferred technical solution, the water pump body includes

[0009] a motor connection part, and the cooling chamber is arranged on the motor connection part;

[0010] and a flange connection part for connecting with the volute; the motor connection part and the volute are respectively located on opposite sides of the flange connection part, and the motor connection part and the flange connection part are of an integral structure;

[0011] An inwardly concave water chamber is provided on the side surface of the flange connection part facing the volute; a bearing seat is provided on the flange connection part, and the bearing seat is located in the cooling chamber; it also includes a through hole for installing a drive shaft, and the through hole penetrates the bearing seat and the flange connection part.

[0012] As a preferred technical solution, a ring-shaped water retaining platform is provided on the bottom surface of the water chamber, and the through hole is located inside the water retaining platform.

[0013] As a preferred technical solution, the through hole includes a bearing mounting hole and a water seal mounting hole. 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 far from the bearing mounting hole is in a horn shape.

[0014] As a preferred technical solution, a drain hole is further provided on the motor connecting part, and the drain hole is communicated with the water seal mounting hole, and the communication position is close to the bearing mounting hole.

[0015] As a preferred technical solution, a water outlet guiding platform is provided on the water chamber corresponding to the position of the volute water outlet. The side surface of the water outlet guiding platform facing the water flow is a guiding surface, and the guiding surface is an arc surface; the inner circulation outlet is arranged on the guiding surface.

[0016] As a preferred technical solution, it further includes 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 guiding surface of the water outlet guiding platform.

[0017] As a preferred technical solution, a water flow guiding platform is spirally arranged on the bottom wall of the cooling tank; gaps are reserved between both ends of the water flow guiding platform and the side wall of the cooling tank, and a water inlet space and a water outlet space are formed at both ends of the water flow guiding platform; the water inlet space corresponds to the position of the inner circulation water inlet, and the water outlet space corresponds to the position of the inner circulation water return port.

[0018] As a preferred technical solution, a first sealing groove and a second sealing groove are respectively arranged at both ends of the cooling tank, and sealing rings are placed in the first sealing groove and the second sealing groove to seal the cooling cavity.

[0019] The assembly process of the above cooling water pump includes the following steps

[0020] Step 1: Press-fit the drive shaft on the water pump body;

[0021] Support the water pump body through a water pump body support tooling, use a bearing outer ring pressing tooling to press on the bearing outer ring of the drive shaft, and press the drive shaft into the bearing seat until the end face of the bearing outer ring of the drive shaft is flush with the end face of the bearing seat;

[0022] Step 2: Install the water seal;

[0023] Support the water pump body and the bearing simultaneously through a water pump body and bearing support tooling, and use a water seal pressing tooling to press-fit the water seal on the water pump body and the drive shaft;

[0024] Step 3: Install the impeller;

[0025] Support the water pump body and the bearing tooling to support the water pump body and the drive shaft at the same time. Use the impeller pressing tooling to press the impeller onto the drive shaft until the small end face of the part where the impeller fits with the mandrel is flush with the end face of the drive shaft.

[0026] Step Four: Install the rotor.

[0027] Use the support tooling to support and position the water pump body and the drive shaft, and use the rotor pressing tooling to press the rotor onto the drive shaft so that the flange end face of the rotor is flush with the shaft head end face of the drive shaft.

[0028] Step Five: Assemble the stator and the motor housing.

[0029] First, heat the motor housing to 100 - 120 °C, and then assemble the stator into the motor housing.

[0030] Step Six: Install the motor housing and the stator together into the water pump body.

[0031] After the temperature of the stator drops to room temperature, install the stator and the motor housing together into the water pump body.

[0032] Step Seven: Install the motor end cover.

[0033] The beneficial effects of the present invention are as follows: The cooling water pump has a compact and reasonable structure. A cooling cavity is provided between the water pump body and the motor housing to cool the motor assembly, enabling self-cooling, energy conservation, and environmental protection. Through a clever design, while meeting the external circulation, the internal circulation of itself is realized to cool the motor.

[0034] A cooling water pump with variable speed to achieve precise control of flow rate has reliable performance, no wear, low failure rate, and long service life; strong electromagnetic compatibility and stable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the first perspective of the present invention;

[0037] Figure 2 It is a schematic structural diagram of the second perspective of the present invention;

[0038] Figure 3 It is a cross-sectional view of the present invention;

[0039] Figure 4 It is a schematic connection structure diagram of the present invention and the volute;

[0040] Figure 5 It is a schematic structural view of a water pump body;

[0041] Figure 6 It is a three-dimensional structural view of a water pump body;

[0042] Figure 7 It is a schematic structural view of an internal circulation water inlet channel;

[0043] Figure 8 It is a schematic structural view of the third perspective of the present invention;

[0044] Figure 9 It is a schematic structural view of a motor housing;

[0045] Figure 10 It is the front view of a motor housing;

[0046] Figure 11 It is the sectional view of a motor housing;

[0047] Figure 12 It is an assembly schematic diagram of a drive shaft and a water pump body;

[0048] Figure 13 It is an assembly schematic diagram of a water seal;

[0049] Figure 14 It is an assembly schematic diagram of an impeller;

[0050] Figure 15 It is an assembly schematic diagram of a stator.

[0051] In the figure,

[0052] 1 - water pump assembly; 11 - water pump body; 111 - flange connection part; 112 - motor connection part; 113 - sensor installation hole; 114 - water retaining platform; 115 - water chamber; 116 - drain hole; 117 - bearing seat; 118 - cooling chamber; 119 - internal circulation water inlet; 120 - water seal installation hole; 121 - bearing installation hole; 122 - water outlet guiding platform; 123 - internal circulation outlet; 124 - convex rib; 125 - internal circulation water return port; 126 - internal circulation water inlet channel; 12 - impeller; 13 - drive shaft; 14 - water seal;

[0053] 2 - motor assembly; 21 - motor housing; 211 - insertion part; 212 - external wiring part; 213 - first sealing groove; 214 - second sealing groove; 215 - shaft shoulder; 216 - wire hole; 217 - stator positioning platform; 218 - water flow guiding platform; 219 - water inlet space; 220 - water outlet space; 221 - cooling groove; 22 - motor end cover; 23 - rotor; 24 - breather valve; 25 - stator;

[0054] 3 - connecting bolt;

[0055] 4 - volute; 41 - internal circulation interface; 42 - large circulation water inlet; 43 - large circulation water outlet;

[0056] 5 - cooling chamber;

[0057] 61 - outer ring tooling for pressing bearing; 62 - water seal pressing tooling; 63 - impeller pressing tooling;

[0058] 71 - tooling for supporting the water pump body; 72 - tooling for supporting the water pump body and bearing; 73 - supporting tooling. Detailed implementation manners

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The descriptions of these implementation manners are used to help understand the present invention, but do not constitute a limitation to the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0060] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, 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 therefore cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "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 otherwise specifically defined.

[0061] A cooling water pump that can achieve precise flow control with variable speed, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown in the figure, it includes a water pump assembly 1, a motor assembly 2, and a connecting bolt 3. The water pump assembly 1 and the motor assembly 2 are fixedly connected by the connecting bolt 3. It also includes a water pump temperature sensor and a motor temperature sensor, which are prior arts and not shown in the figure. The water pump assembly 1 is fixedly connected to the volute 4. The large-circulation water inlet 42 of the volute 4 is tangentially inlet, and the water outlet direction of the large-circulation water outlet 43 is parallel to the axial direction of the impeller 12.

[0062] The water pump assembly includes a water pump body 11, a drive shaft 13, a water seal 14, and an impeller 12.

[0063] As Figure 5 , Figure 6 , Figure 7 and Figure 8 shown, the water pump body 11 includes a flange connection part 111 and a motor connection part 112, and the flange connection part 111 and the motor connection part 112 are of an integral structure.

[0064] The flange connection part 111 is in a disc shape, and two opposite side surfaces are respectively connected to the volute 4 and the motor assembly. The side surface connected to the volute 4 is set as the volute connection surface, and the side surface connected to the motor assembly 2 is set as the motor connection surface.

[0065] The motor connection part 112 is located on the motor connection surface of the flange connection part 111. A bearing seat 117 is provided on the motor connection surface of the flange connection part 111. A cooling chamber 118 is provided inside the motor connection part 112. The bearing seat 117 is located inside the cooling chamber 118; one end of the cooling chamber 118 away from the flange connection part 111 is an open mouth for connecting to the motor housing 21. A plurality of limiting shoulders are provided on the inner side wall of the cooling chamber 118 for connecting and limiting the motor housing 21. As Figure 5 and Figure 7 shown, two annular limiting shoulders are provided inside the cooling chamber 118.

[0066] An inwardly concave water chamber 115 is provided on the volute connection surface of the flange connection part 111. The flange connection part 111 is also provided with a through hole for installing the drive shaft 13. The through hole penetrates through the bearing seat 117 and the flange connection part 111, that is, one end of the through hole opens in the cooling chamber 118, and the other end opens in the water chamber 115. A ring-shaped water retaining platform 114 is provided on the bottom surface of the water chamber 115. The through hole is located inside the water retaining platform 114. As Figure 5 shown, the through hole includes a bearing installation hole 121 and a water seal installation hole 120. The water seal installation hole 120 is arranged close to the water retaining platform 114. The aperture of the bearing installation hole 121 is smaller than the aperture of the water seal installation hole 120. One end of the water seal installation hole 120 away from the bearing installation hole 121 is in a trumpet shape to facilitate the installation of the water seal 14.

[0067] The drive shaft 13 can be a shaft coupling bearing for a water pump or an ordinary transmission shaft, as long as it can transmit the power of the motor to the impeller 12. The drive shaft 13 is located in the through hole and is rotatably installed on the water pump body 11. Both ends of the drive shaft 13 are located on both sides of the flange connection portion 111, that is, one end passes through the water seal mounting hole 120 and is fixedly connected to 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 located in the water seal mounting hole 120 and is sleeved on the outside of the drive shaft 13.

[0068] At the position of the water chamber 115 corresponding to the water outlet of the volute 4, there is a water outlet guiding platform 122. The side of the water outlet guiding platform 122 facing the water flow is the guiding surface, and the guiding surface is an arc surface. The water flow in the water chamber 115 moves in a curve in the water chamber 115 under the action of the impeller 12, and the water outlet direction is perpendicular to the volute connection surface. The water outlet guiding platform 122 can buffer the water flow and guide the water outlet. The guiding surface of the water outlet guiding platform 122 is provided with a sensor mounting hole 113 and an internal circulation outlet 123. The sensor mounting hole 113 is a through hole that penetrates the flange connection portion 111 and is used for installing a water pump temperature sensor.

[0069] An internal circulation water inlet channel 126 is arranged in the water pump body 11. Specifically, a convex rib 124 is arranged on the water pump body 11, and the internal circulation water inlet channel 126 is located inside the convex 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 opens on the inner wall of the cooling chamber 118 to form an internal circulation water inlet 119. The motor connection portion 112 is also provided with an internal circulation water return port 125 and a drain hole 116. The internal circulation water return port 125 is located 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 cycle to cool the motor assembly 2 and improve the service life of the motor; the drain hole 116 is communicated with the water seal mounting hole 120, and the communication position is between the water seal 14 and the bearing. The drain hole 116 is used to monitor whether the water seal 14 leaks. If the water seal 14 leaks, water will flow out of the drain hole 6. When it is detected that there is water flowing out of the drain hole 116, the electronic water pump needs to be repaired or replaced in time.

[0070] Preferably, the internal circulation water inlet 119 is located at one end of the motor connection portion 112 away from the flange connection portion 111, and the internal circulation water return port 125 is close to the water chamber 115. The high-pressure water is directly delivered to one end of the motor connection portion 112 away from the water chamber 115, and the low-pressure water after cooling the motor assembly 2 returns to the water chamber 115 again. By using the water pressure difference between the internal circulation water inlet 119 and the internal circulation water return port 125, self-circulation cooling and temperature reduction are realized.

[0071] The motor assembly 2 includes a motor housing 21, a stator 25, a rotor 23, a connecting wire 3, a motor end cover 22, and a breather valve 24. The stator 25 is fixed on the drive shaft 13, and the stator 25 is connected to the motor housing 21 by interference fit. The breather valve 24 is arranged on the motor end cover 22, and the motor end cover 22 closes one end of the motor housing 21. The breather valve 24 is arranged on the motor end cover 22, which will heat up the air inside the motor during motor operation, and adding the breather valve 24 can ensure the balance of internal and external air pressures; if the gas cannot be discharged in time, when the engine cools down, water stains will be generated, and the water stains entering between the stator 25 and the rotor 23 may cause a short circuit, resulting in a water pump failure.

[0072] As Figure 9 , Figure 10 and Figure 11 shown, the motor housing 21 is in the shape of a cylinder with both ends open, and includes an insertion part 211 inserted into the water pump body 11 and an external wiring part 212.

[0073] A plurality of wire holes 216 for the passage of lines are arranged on the external wiring part 212. As Figure 9 and Figure 10 shown, four wire holes 216 are arranged on the external connection part, which are respectively used for the installation and connection of three-phase electric wires and the motor temperature sensor line.

[0074] An inwardly concave cooling groove 221 is arranged on the insertion part 211, and the cooling groove 221 and the inner wall of the cooling chamber 118 cooperate with each other to form a cooling cavity 5. As Figure 7 shown, the water in the volute chamber flows into the internal circulation water channel 126 from the internal circulation outlet 123, enters the cooling cavity 5 from the internal circulation inlet 119, and finally flows back to the volute chamber through the internal circulation return port 125. Through the circulation of the coolant inside the engine, the motor can be quickly cooled without weakening its cooling performance.

[0075] A water flow guiding platform 218 is spirally arranged on the bottom wall of the cooling groove 221, which can increase the flow path of the water flow in the cooling cavity 5 and improve the heat exchange effect between the water and the motor. A gap is reserved between the two ends of the water flow guiding platform 218 and the side wall of the cooling groove 221, that is, the end of the water flow guiding platform 218 is not connected to the side wall of the cooling groove 221. In this way, there is a wider water inlet space 219 and a water outlet space 220 with a width greater than the pitch of the water flow guiding platform 218 at both ends of the water flow guiding platform 218. The water inlet space 219 corresponds to the position of the internal circulation inlet 119 on the water pump body 11, and the water outlet space 220 corresponds to the position of the internal circulation return port 125 of the water pump body 11.

[0076] Preferably, the distance L1 between the end of the water flow guiding platform 218 and the side wall of the cooling groove 221 is 4.5 mm; the pitch L3 of the water flow guiding platform 218 is 7 mm; the height L2 of the water flow guiding platform 218 relative to the bottom wall of the cooling groove 221 is 3.5 mm.

[0077] After the insertion part 211 is inserted into the water pump body 11 and the assembly is completed, the inner wall of the water pump body 11 fits against the outer side surface of the water flow guiding platform 218, and a spiral cooling water channel is formed between the water pump body 11 and the insertion part 211. When the electric water pump operates, circulating water is continuously supplied in the cooling water channel to cool the motor.

[0078] The insertion part 211 is at least provided with a first sealing groove 213 and a second sealing groove 214, and the first sealing groove 213 and the second sealing groove 214 are respectively located at both ends of the cooling groove 221. Sealing rings are placed in the first sealing groove 213 and the second sealing groove 214, and a sealed cooling cavity 5 is formed between the two sealing rings, the water pump body 11 and the insertion part 211.

[0079] One end of the insertion part 211 away from the external wiring part 212 is provided with a shoulder 215, the outer diameter of the shoulder 215 is smaller than the outer diameter of the water flow guiding platform 218, and a positioning surface for installation is formed at the shoulder 215. The inner cavity of the insertion part 211 is provided with a stator installation cavity for fixedly connecting with the stator, and a stator positioning platform 217 is arranged on the inner wall at the shoulder 215.

[0080] The assembly process of the above cooling water pump includes the following steps:

[0081] First, prepare materials and check; receive qualified parts from the warehouse according to the material requisition note and check the appearance quality of the parts.

[0082] Step 1: Press-fit the drive shaft 13 onto the water pump body 11;

[0083] As Figure 12 shown, place the water pump body support tooling 71 on the platform, and then place the water pump body 11 on the water pump body support tooling 71; the upper side surface of the water pump body support tooling 71 supports and positions the volute connection surface of the water pump body 11.

[0084] Use the press-bearing outer ring tooling 61 to press on the bearing outer ring of the drive shaft 13, and press the drive shaft 13 into the water pump body 11 until the end face of the bearing outer ring of the drive shaft 13 is flush with the end face of the bearing seat 117.

[0085] Step 2: Install the water seal 14;

[0086] Use the water pump body and bearing support tooling 72 to support the water pump body 11 and the drive shaft 13 at the same time, and use the press-water seal tooling 62 to press-fit the water seal 14 onto the water pump body 11 and the drive shaft 13.

[0087] Among them, as Figure 13 shown, the water pump body and bearing support tooling 72 supports the end face of the bearing seat 117 and the end face of the drive shaft 13.

[0088] The working height of the water seal 14 is 6.6 ± 0.1 mm, that is, the height of the end face of the water seal 14 relative to the bottom surface of the water chamber 115 is 6.6 ± 0.1 mm.

[0089] Step 3: Install the impeller 12;

[0090] As Figure 14 shown, use the water pump body and bearing tooling 72 to support the water pump body 11 and the drive shaft 13 at the same time, and use the impeller pressing tooling 63 to press-fit the impeller 12 onto the drive shaft 13, ensuring that the small end face of the part where the impeller 12 fits with the core shaft is flush with the end face of the drive shaft 13.

[0091] Step 4: Install the rotor 23;

[0092] Use the support tooling 73 to support and position the water pump body 11 and the drive shaft 13; use the rotor pressing tooling to press-fit the rotor 23 onto the bearing of the drive shaft 13, and the flange end face of the rotor 23 is flush with the shaft head end face of the drive shaft 13.

[0093] Among them, as Figure 15 shown, the support tooling 73 includes multiple support rods. A part of the support rods are matched with the connection holes of the flange connection part 111 for positioning and support; one of the support rods supports the end face of the drive shaft 13.

[0094] Step 5: Assemble the stator 25 and the motor housing 21;

[0095] First, heat the motor housing 21 to 100 - 120 °C, and then assemble the stator 25 into the motor housing 21. During assembly, pay attention to the angular fit with the motor housing 21 to ensure that the wire harness of the stator 25 can pass through the wire harness hole on the motor housing 21 conveniently.

[0096] Step 6: Install the motor housing 21 and the stator 25 into the water pump body 11 together;

[0097] After the temperature of the stator 25 drops to room temperature, install the sealing rings into the first sealing groove 213 and the second sealing groove 214; then install the stator 25 and the motor housing 21 into the water pump body 11 together.

[0098] During assembly, pay attention to the correspondence between the two ends of the spiral groove of the motor housing 21 and the inner circulation water inlet 119 and the inner circulation water return port 125.

[0099] Lead out the three-phase wire connected to the stator 25 and the wire connected to the motor temperature sensor respectively; and install the water pipe joint 19.

[0100] Step 7: Install the motor end cover 22;

[0101] First, put the O-ring on the motor end cover 22; use three M8x50 socket head cap screws 3 to fasten the motor end cover 22, the motor housing 21, and the water pump body 11 together; finally, install the breather valve 24.

[0102] Inside the motor housing 21, there is a motor temperature sensor, which will monitor the temperature in real time through the controller and give feedback. Once an abnormality occurs, there is a protection device on the controller to prevent abnormal operation caused by high temperature. The assembly of the motor housing 21 and the stator 25 is simple and easier to operate, shortening the assembly time, improving work efficiency, and correspondingly shortening the R & D cycle. Place a three-phase AC motor inside the motor housing 21. The gap between the stator 25 and the rotor 23 is smaller and the efficiency is higher; moreover, a limit ring is provided on the rotor 23 to make the work more reliable. The pump structure has stronger integrated integration, which can reflect higher safety from the side. The cooling water pump can meet the cooling needs of the engine. The engine ECU receives the coolant temperature signal, and the ECU sends the motor frequency with pre-calibrated temperature to the controller. The controller controls the motor to rotate, and the electronic rotor drives the impeller to stir the coolant to achieve temperature cooling. When the coolant temperature reaches a certain set value, it will give feedback to the ECU again, and so on in a cycle. By precisely controlling the motor speed, the rotation of the linkage bearing and the impeller is realized, so as to achieve the flow rate change at different speeds; according to the temperature requirement of the engine, the motor speed is precisely controlled to accurately and quantitatively transport the liquid.

[0103] This cooling water pump is electrically driven. During operation, it does not occupy the power output by the crankshaft, which can directly reduce the power output provided by the engine in the original mechanical pump; save the engine output power; shorten the engine warm-up time, save energy and protect the environment, and save 3.5% of fuel. It mainly consumes the surplus electric energy of the generator, reducing waste; cancels the pulley drive, cancels the large radial force received by the original mechanical pump during operation, can improve the service life of the bearing, and at the same time can optimize the installation space of the engine. Moreover, the structure is compact, with a small volume and light weight. After adopting the motor drive, stepless speed regulation control of the water pump is realized. During operation, the noise is very small, which is significantly quieter than that of the mechanical pump, and the vibration and impact force are reduced. Through a clever design, while meeting the external circulation, the internal circulation of itself is realized to cool the motor; at the same time, the installation space of the engine can be optimized.

[0104] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cooling water pump with variable speed for precisely controlling the flow rate, comprising a water pump assembly (1) and a motor assembly (2), Characterized in that: The water pump assembly (1) at least includes a water pump body (11), and an internal circulation outlet (123) is provided on the water pump body (11) corresponding to the outlet position of the volute (6); the water pump body (11) is provided with a cooling chamber (118); an internal circulation water channel (126) is provided inside 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 opens on the inner wall surface of the cooling chamber (118) to form an internal circulation inlet (119); the cooling chamber (118) is also provided with an internal circulation return port (125); The motor assembly (2) at least includes a motor housing (21), and one end of the motor housing (21) extends into the cooling chamber (118); a concave cooling groove (221) is provided on the outer wall of the motor housing (21) located in the cooling chamber (118), and a closed cooling cavity is formed between the inner wall surface of the cooling chamber (118) and the cooling groove (221); The water in the volute chamber flows from the internal circulation outlet (123) into the internal circulation water channel (126), enters the cooling cavity from the internal circulation inlet (119), and finally flows back to the volute chamber through the internal circulation return port (125); The water pump body (11) includes a motor connection part (112), and the cooling chamber (118) is arranged on the motor connection part (112); and a flange connection part (111) for connecting with the volute (6); the motor connection part (112) and the volute (6) are respectively located on opposite sides of the flange connection part (111), and the motor connection part (112) and the flange connection part (111) are of an integral structure; A concave water chamber (115) is provided on the side surface of the flange connection part (111) facing the volute; a bearing seat (117) is provided on the flange connection part (111), and the bearing seat (117) is located in the cooling chamber (118); it also includes a through hole for installing a drive shaft, and the through hole penetrates through the bearing seat (117) and the flange connection part (111).

2. A cooling water pump with variable speed for precisely controlling the flow rate according to claim 1, Characterized in that: A ring-shaped water retaining platform (114) is provided on the bottom surface of the water chamber (115), and the through hole is located inside the water retaining platform (114).

3. A cooling water pump with variable speed for precisely controlling the flow rate according to claim 2, Characterized in that: The through hole includes a bearing installation hole (121) and a water seal installation hole (120), and the water seal installation hole (120) is arranged close to the water retaining platform (114); the aperture of the bearing installation hole (121) is smaller than the aperture of the water seal installation hole (120), and one end of the water seal installation hole (120) far from the bearing installation hole (121) is in a flared shape.

4. A cooling water pump with variable speed for precisely controlling the flow rate according to claim 3, Characterized in that: The motor connection part (112) is also provided with a drain hole (116), and the drain hole (116) is communicated with the water seal installation hole (120), and the communication position is close to the bearing installation hole (121).

5. A cooling water pump with variable speed for precisely controlling the flow rate according to claim 1, It is characterized in that: At the position of the water chamber (115) corresponding to the water outlet of the volute (6), a water outlet guiding platform (122) is provided. The side of the water outlet guiding platform (122) facing the water flow is a guiding surface, and the guiding surface is an arc surface; the inner circulation outlet (123) is arranged on the guiding surface.

6. The cooling water pump for precisely controlling the flow rate by variable speed according to claim 5, It is characterized in that: It further includes 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 guiding surface of the water outlet guiding platform (122).

7. The cooling water pump for precisely controlling the flow rate by variable speed according to claim 1, It is characterized in that: A water flow guiding platform (218) is spirally arranged on the bottom wall of the cooling tank (221); gaps are reserved between the two ends of the water flow guiding platform (218) and the side walls of the cooling tank (221), and a water inlet space (219) and a water outlet space (220) are formed at the two ends of the water flow guiding platform (218); the water inlet space (219) corresponds to the position of the inner circulation water inlet (119), and the water outlet space (220) corresponds to the position of the inner circulation water return port (125).

8. The cooling water pump for precisely controlling the flow rate by variable speed according to claim 1, It is characterized in that: First sealing grooves (213) and second sealing grooves (214) are respectively arranged at both ends of the cooling tank (221), and sealing rings are placed in the first sealing grooves (213) and the second sealing grooves (214) to seal the cooling cavity.

9. The assembly process of the cooling water pump according to any one of claims 1 to 8, It is characterized in that: It includes the following steps Step 1: Press-fit the drive shaft (13) onto the water pump body (11); Support the water pump body (11) through the water pump body support tooling (71), press on the outer ring of the bearing of the drive shaft (13) using the outer ring of the bearing pressing tooling (61), and press the drive shaft (13) into the bearing seat (117) until the end face of the outer ring of the bearing of the drive shaft (13) is flush with the end face of the bearing seat (117); Step 2: Install the water seal (14); Support the water pump body (11) and the drive shaft (13) simultaneously using the water pump body and bearing support tooling (72), and press-fit the water seal (14) onto the water pump body (11) and the drive shaft (13) using the water seal pressing tooling (62); Step 3: Install the impeller (12); Support the water pump body (11) and the drive shaft (13) simultaneously using the water pump body and bearing support tooling (72), and press-fit the impeller (12) onto the drive shaft (13) using the impeller pressing tooling (63) until the small end face of the part of the impeller (12) cooperating with the core shaft is flush with the end face of the drive shaft (13); Step 4: Install the rotor (23); Support and position the water pump body (11) and the drive shaft (13) using the support tooling (73), and press-fit the rotor (23) onto the drive shaft (13) using the rotor pressing tooling so that the flange end face of the rotor (23) is flush with the shaft head end face of the drive shaft (13); Step 5: Assemble the stator (25) and the motor housing (21); First, heat the motor housing (21) to 100 - 120 °C, and then assemble the stator (25) into the motor housing (21). Step 6: Install the motor housing (21) and the stator (25) together into the water pump body (11). After the temperature of the stator (25) drops to room temperature, install the stator (25) and the motor housing (21) together into the water pump body (11). Step 7: Install the motor end cover (22).

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