Automobile electronic cooling water pump

Abstract

The application discloses a kind of automobile electronic cooling water pump, the automobile electronic cooling water pump includes volute, impeller, pump shell, motor and end seat, volute has pump water chamber, volute, pump shell and end seat are assembled into one, motor is assembled in pump shell, the side wall of pump shell is formed with cooling chamber not penetrating its bottom around, the top of pump shell is equipped with with the position of pump shell contact with the liquid inlet hole of the communication of pump water chamber and cooling chamber, the side wall of pump shell is equipped with with the liquid outlet hole of the communication of cooling chamber, liquid inlet hole, cooling chamber and liquid outlet hole are communicated to form first cooling channel.The automobile electronic cooling water pump disclosed in the application pump shell is an integral whole, the whole motor is directly loaded into pump shell, so that installation is more simple and convenient.Cooling liquid enters first cooling channel from pump water chamber, the temperature of pump shell surrounded by the cooling chamber is effectively reduced, so as to reduce the temperature of motor and other electronic devices located in the interior of pump shell, and avoid the phenomenon of burning due to excessive working temperature.

Description

Technical Field

[0001] This invention relates to the field of water pump technology, and more particularly to an automotive electronic cooling water pump. Background Technology

[0002] Currently, electric water pumps are becoming increasingly important in automotive thermal management systems, whether in internal combustion engines, hybrid vehicles, or new energy electric vehicles. This is especially true in the field of new energy vehicles, where motors are more sensitive to temperature, requiring electric water pumps to control their operating temperature. Compared to traditional water pumps, electric water pumps offer advantages such as precise control and higher efficiency. Modern high-end cars and electric vehicles largely replace traditional mechanical water pumps with electric water pumps. Electric water pumps are favored by industry professionals due to their compact structure, ease of use, powerful functions, long lifespan, stable performance, low noise, low energy consumption, and high efficiency. With the rapid development of industry, the application fields of electric water pumps are becoming increasingly widespread, particularly in the automotive sector.

[0003] Most of the planar electronic control boards in existing automotive electronic water pumps can only be cooled by air cooling. Due to the poor ventilation structure inside the electronic water pump, the cooling effect achieved by this air cooling method is also correspondingly poor. The motor and internal electronic components cannot be effectively cooled, making the motor and electronic components prone to burnout, which will greatly reduce the stability and reliability of the electronic water pump.

[0004] Therefore, it is necessary to propose an automotive electronic coolant pump to address the aforementioned shortcomings. Summary of the Invention

[0005] The main objective of this invention is to provide an automotive electronic water pump that addresses the problem of existing electronic water pumps using air cooling, which can easily burn out the motor and electronic components.

[0006] To achieve the above objectives, the present invention provides an automotive electronic coolant pump, comprising a volute, an impeller, a pump housing, a motor, and an end seat. The volute has a water-pumping chamber. The volute, pump housing, and end seat are assembled as a single unit. The motor is assembled inside the pump housing. The impeller is installed inside the volute and axially mounted on the motor. The pump housing has a cooling chamber circumferentially formed around its centerline, not penetrating its top or bottom. The top of the pump housing has an inlet hole communicating with the water-pumping chamber and the cooling chamber. The side wall of the pump housing has an outlet hole communicating with the cooling chamber. The inlet hole, the cooling chamber, and the outlet hole communicate to form a first cooling channel.

[0007] Preferably, the cooling chamber has a spiral-shaped annular groove recessed on the side of the inner wall near the pump casing towards the centerline.

[0008] Preferably, the pump housing is integrally formed.

[0009] Preferably, the motor includes an end plate, a rotor assembly, a stator assembly, and a waterproof sleeve. The end plate is fitted with the pump housing to seal the opening of the pump housing. The rotor assembly has a rotating shaft with liquid passage holes extending through its two end faces. One end of the waterproof sleeve is fitted onto the end plate, and the other end is fitted onto the end seat. The end plate, the waterproof sleeve, and the end seat are connected and separate the stator assembly and the rotor assembly into two non-communicating regions.

[0010] The end seat extends from its base plate toward the end plate to form a support with a mounting hole in the middle. The rotating shaft is fixed to the mounting hole. A liquid passage groove is provided on the support, and the liquid passage groove communicates with the mounting hole.

[0011] One end of the rotating shaft is fixed to the end seat, and the other end passes through the end plate. The impeller is axially mounted on the rotating shaft and located in the pump chamber.

[0012] The end plate has a liquid inlet that communicates with the pump chamber, and a liquid passage gap that communicates with the liquid inlet is formed between the outer wall of the rotor assembly and the inner wall of the waterproof sleeve.

[0013] The pump chamber is connected to the liquid inlet, the liquid passage gap, the liquid passage tank and the liquid passage hole to form a second cooling channel.

[0014] Preferably, the end plate extends toward the end seat to form a mounting base, and the two ends of the waterproof sleeve are respectively fitted onto the mounting base and the support. The waterproof sleeve includes a sleeve body and a first connecting end and a second connecting end that bend and extend from both ends of the sleeve body. The first connecting end is fitted onto the mounting base, and the cross-section of the first connecting end has a stepped structure. The second connecting end is fitted onto the support, and the second connecting end is provided with a rolled edge that is turned up toward the outer periphery of the sleeve body.

[0015] Preferably, the sleeve body is cylindrical.

[0016] Preferably, the rotor assembly includes a rotor core and a sealing sleeve covering the outside of the rotor core, and the gap formed between the sealing sleeve and the waterproof sleeve is the liquid passage gap.

[0017] Preferably, the impeller includes a hub, an impeller frame, and a plurality of blades, each blade being spaced apart from each other along the circumferential direction of the impeller frame, the spacing between the spaced blades being non-equidistant and not the same, the hub being axially fixed to the rotating shaft, the top of the impeller frame being recessed downward to form an annular groove, and the volute being embedded in the annular groove.

[0018] Preferably, the periphery of the end plate is press-fitted to the side wall of the pump casing.

[0019] Preferably, it further includes a sealing ring disposed between the volute and the pump housing.

[0020] Compared with the prior art, the automotive electronic coolant pump provided by the present invention has the following beneficial effects:

[0021] The automotive electronic water pump provided by this invention has a single, integral pump housing. During installation, the entire motor can be directly inserted into the pump housing, simplifying installation and improving sealing. Coolant enters the first cooling channel from the pump water chamber, effectively reducing the temperature of the pump housing surrounded by the cooling chamber. This lowers the temperature of the motor and other electronic components located inside the pump housing, preventing burnout due to overheating and thus extending the service life of the electronic water pump. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A perspective view of the automotive electronic coolant pump provided by the present invention;

[0024] Figure 2 for Figure 1 The image shows a cross-sectional view of an automotive electronic coolant pump.

[0025] Figure 3 for Figure 2 An enlarged view of the structure of part A shown below;

[0026] Figure 4 for Figure 2 Enlarged view of part B shown

[0027] Figure 5 for Figure 2 The diagram shows a partial structural schematic of the pump casing;

[0028] Figure 6 for Figure 2 The diagram shows the structure of the waterproof sleeve.

[0029] Figure 7 for Figure 2 The diagram shows the structure of the impeller.

[0030] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0035] Please refer to the reference. Figures 1 to 3This invention provides an automotive electronic coolant pump. The automotive electronic coolant pump includes a volute 1, a pump housing 2, an end seat 3, a motor 5, and an impeller 7. The volute 1 has a pumping chamber 8. The volute 1, pump housing 2, and end seat 3 are assembled as a single unit. The motor 5 is assembled inside the pump housing 2. The impeller 7 is installed inside the volute 1 and axially mounted on the motor 5, driven to rotate by the motor 5. A cooling chamber 20, which does not penetrate the top and bottom, is formed circumferentially around the centerline of the pump housing 2. An inlet hole 201, communicating with both the pumping chamber 8 and the cooling chamber 20, is provided at the top of the pump housing 2 where it contacts the pump housing 2. An outlet hole 203, communicating with the cooling chamber 20, is provided on the side wall of the pump housing 2. The inlet hole 201, the cooling chamber 20, and the outlet hole 203 communicate to form a first cooling channel. A flow gap 10 is formed between the volute 1 and the pump housing 2, through which the cooling medium from the pump water chamber 8 flows into the inlet hole 201. The motor 5 is integrally installed inside the pump housing 2, and the sidewall of the pump housing 2 is a single unit. During installation, the entire motor 5 can be directly inserted into the pump housing 2, making installation simpler and improving sealing. The coolant enters the first cooling channel from the pump water chamber, effectively reducing the temperature of the pump housing 2 surrounded by the cooling chamber 20. This lowers the temperature of the motor 5 and electronic components located inside the pump housing 2, preventing burnout due to excessive operating temperature and thus extending the service life of the electronic cooling water pump.

[0036] The cooling chamber 20 has a spiral-shaped annular groove 25 recessed along the centerline on the inner wall of the pump casing 20. This annular groove 25 surrounds the entire pump casing 20 along its height, allowing the coolant entering the cooling chamber 20 to encircle the entire sidewall of the pump casing. This significantly increases the contact area between the coolant and the pump casing 2, enhancing the cooling effect and effectively reducing the temperature of the motor 5 and electronic components inside the pump casing 2. This reduces the risk of burnout due to overheating and extends the service life of the electronic cooling water pump.

[0037] Furthermore, the pump housing 2 is integrally formed. This ensures the strength of the pump housing 2 while also guaranteeing the sealing of the annular cooling water channel, thus improving the reliability of the electronic water pump.

[0038] like Figure 2 and Figure 3 As shown, specifically, the end of the pump casing 2 is sealed by an end plate 21, and the fluid flow gap 10 is located between the top surface of the end plate 21 and the volute 1. Figure 2As shown, the motor 5 includes a rotor assembly 53 and a stator assembly 55, and a waterproof sleeve 4 is provided inside the motor 5. The end plate 21 is used to install the pump housing 2 to seal the opening of the pump housing 2. The rotor assembly 53 has a rotating shaft 531, and the rotating shaft 531 has liquid passage holes 5311 that pass through its two end faces. One end of the waterproof sleeve 4 is sleeved on the end plate 21, and the other end is sleeved on the end seat 3. The end plate 21, the waterproof sleeve 4, and the end seat 3 are connected and separate the stator assembly 55 and the rotor assembly 53 into two non-communicating areas. The two areas separated by the waterproof sleeve 4 are a water inlet cooling area and a drying area, which are not connected to each other. Moreover, the water inlet cooling area has good sealing to prevent the coolant entering the area from entering the drying area. The stator assembly 55 is located in the drying area. Therefore, the drying area must be kept waterproof to avoid short circuits in the energized coils of the rotor assembly 53.

[0039] Please refer to the following: Figure 2 and Figure 5 The pump housing 2 extends from its bottom plate toward the end plate 21 to form a support 33 with a mounting hole 31 in the middle. The rotating shaft 531 is fixed to the mounting hole 31. A liquid passage groove 35 is provided on the support 33. The liquid passage groove 35 communicates with the mounting hole 31 to form a channel for liquid flow.

[0040] One end of the rotating shaft 531 is fixed to the bottom plate of the pump casing 2, and the other end passes through the end plate 21. The rotating shaft 531 passes through the pump casing 2 body, and the impeller 7 is axially mounted on the rotating shaft 531 and located inside the pump water chamber 8. The rotor assembly 53 drives the impeller 7 to rotate, pumping out the cooling medium that has entered the pump water chamber 8.

[0041] like Figure 2 and Figure 4 As shown, the end plate 21 has a liquid inlet 23 communicating with the pump water chamber 8. A liquid passage gap 9 communicating with the liquid inlet 23 is formed between the outer wall of the rotor assembly 53 and the inner wall of the waterproof sleeve 4. The cooling medium entering the pump water chamber 8 flows through the liquid inlet 23 to the liquid passage gap 9. The pump water chamber 8 forms a second cooling channel by communicating with the liquid passage gap 9, the liquid passage groove 35, and the liquid passage hole 5311 through the liquid inlet 23. The coolant entering from the liquid inlet 23 passes through the liquid passage gap and the liquid passage groove 35 and is discharged from the liquid passage hole 5311 to the pump water chamber 8, so that the cooling channel passes through the inside of the water pump to form a self-cooling circulation system. The coolant flows inside the electric water pump and carries away the heat generated by the motor and other electronic components during operation, thereby achieving the purpose of cooling.

[0042] Therefore, the first cooling channel is set on the side wall of the pump casing 2, and the cooling medium flows on the side wall of the pump casing 2 to reduce the temperature. The second cooling channel passes through the inside of the motor, so that the cooling medium also flows from the inside of the pump body to further reduce the temperature. In this way, the temperature is reduced simultaneously by the combination of the first cooling channel and the second cooling channel, which greatly improves the cooling efficiency.

[0043] In related technologies, during the rotation of the impeller 7 within the housing cavity, the blades 75 of the impeller 7 and the inner wall of the housing cavity have a certain sealing performance. Under the action of centrifugal force, positive pressure is formed in the outlet pipe, and a vacuum is formed in the inlet pipe. The pressure difference is used to actively force water into the inner cavity of the housing. This process often results in a delay in the formation of cooling water circulation due to the machining accuracy of the mating surfaces of the impeller 7 blades 75 and the housing, thus affecting the internal cooling speed of the water pump and consequently the overall performance of the electronic water pump. In contrast, the cooling channel of the electronic water pump of this invention enters from the pump water chamber. The coolant in the cooling channel is the cooling medium pumped by the electronic water pump, eliminating the need for a separate coolant supply. While the electronic water pump is pumping the cooling medium, that is, during the operation of the electronic water pump, the coolant is delivered to the cooling channel. This function is achieved through improvements in the pump's structure. While improving the cooling effect, it ensures that the pump's structural dimensions are compact and its volume is reduced. Especially in operating conditions where smaller size and higher power requirements are needed, the performance of the electronic water pump of this invention is particularly outstanding.

[0044] like Figure 2 As shown, specifically, the end plate 21 extends toward the end seat 3 to form a mounting base 211, and the two ends of the waterproof sleeve 4 are respectively fitted onto the mounting base 211 and the mounting base 33. The mounting base 211, the waterproof sleeve 4, and the mounting base 33 are connected as a whole, and the enclosed internal space of the mounting base 211, the waterproof sleeve 4, and the mounting base 33 is a water inlet cooling area, while its exterior is a drying area.

[0045] Please see Figure 2 and Figure 3Furthermore, the pump casing 2, at the end furthest from the impeller 7, also has a receiving cavity 38. The end seat 3, assembled on the pump casing 2, encloses the receiving cavity 38. The circuit control board 40 is disposed within the receiving cavity 38 and fixed to the bottom plate of the pump casing 2. It is understood that the coolant in the cooling channel flows through the bottom of the pump casing 2, and the cooling effect is transmitted through the bottom plate, thus cooling the circuit control board 40 mounted on the bottom plate of the pump casing, thereby reducing the operating temperature of the circuit control board 40. Therefore, the cooling channel not only reduces motor instability but also lowers the temperature of the circuit control board. The electronic water pump of the present invention does not require increased volume, improves the heat dissipation performance of the electronic water pump, reduces the operating temperature of the controller, ensures the performance of the electronic water pump, increases the service life of the controller, and has a simple process, low cost, good sealing effect, and is not easily damaged, greatly extending the service life of the electronic water pump.

[0046] Understandably, to improve the waterproof performance between the two areas isolated by the waterproof sleeve 4, sealing rings are provided between the waterproof sleeve 4 and the support 33, and between the waterproof sleeve 4 and the mounting base 211. These sealing rings significantly enhance the isolation performance between the two areas, resulting in superior waterproof performance between the isolated areas.

[0047] like Figure 6 As shown, the waterproof sleeve 4 further includes a sleeve body 41 and a first connecting end 43 and a second connecting end 45 extending from both ends of the sleeve body 41. The first connecting end 43 is sleeved on the mounting base 211, and the cross-section of the first connecting end 43 has a stepped structure. The second connecting end 45 is sleeved on the support 33, and the second connecting end 45 has a rolled edge facing the outer periphery of the sleeve body 41. The first connecting end 43 and the mounting base 211 are sealed with a sealing ring.

[0048] Understandably, the waterproof sleeve 4 is a sealing component, and its shape is designed to fit the structure between the internal stator assembly and rotor assembly. Since the position where the stator assembly and the rotor assembly fit together is straight, the sleeve body 41 is cylindrical.

[0049] like Figure 2As shown, the stator assembly 55 and the rotor assembly 53 constitute a motor. The stator assembly 55 includes a stator core, enameled wire, a wire guide, and a bobbin. The enameled wire is wound around the stator core and the bobbin. The rotor assembly 53 is rotatably disposed within the pump housing 2. The rotor assembly 53 includes a rotor core 532 and a sealing sleeve 533 that surrounds the rotor core 532. The gap formed between the sealing sleeve 533 and the waterproof sleeve 4 is the liquid passage gap 9. The sealing sleeve 533 covers the outside of the rotor core 532 and is welded integrally with the rotor core 532. The sealing sleeve 533 encloses the rotor core 532 inside and forms a seal to prevent water from entering the rotor core 532.

[0050] A gap is formed between the sealing sleeve 533 and the waterproof sleeve 4, through which coolant flows to reduce the temperature between the rotor assembly 53 and the stator assembly 55, thereby reducing the operating temperature of the motor, reducing the possibility of the motor burning out due to excessive operating temperature, improving the service life of the motor, increasing the stability of the water pump, and also improving the service life of the water pump.

[0051] like Figure 7 As shown, the impeller 7 includes a hub 71, an impeller frame 73, and multiple blades 75. The blades 75 are spaced apart from each other along the circumference of the impeller frame 73. The spacing between the spaced blades 75 is non-equidistant, thus reducing noise generated during impeller rotation through a simple structure. The hub 71 is axially fixed to the rotating shaft 531. The top of the impeller frame 73 is recessed downwards to form an annular groove, and the volute 1 is embedded in the annular groove. The blades 75 employ a guide impeller design, which easily creates negative pressure within the volute 1 after the impeller 7 starts, resulting in rapid self-priming performance without any lag. On the other hand, the coolant is guided by the impeller 7 before entering the housing and enters the inner cavity of the volute 1 along the direction of the blades 75. This avoids the high-speed cooling water directly impacting the impeller 7 and generating instantaneous noise. The impeller 7 structure design with a guiding function allows the coolant to generate a faster transfer effect under the action of the impeller 7. The coolant flow rate is faster and the flow rate into the cooling channel is faster, which makes the cooling speed inside the motor faster and thus effectively improves the overall performance of the water pump.

[0052] It is worth mentioning that, in order to improve the waterproof performance of the end plate 21 and the pump housing 2, the periphery of the end plate 21 is fitted with the side wall of the pump housing 2 by an interference fit. At the same time, waterproof adhesive can also be applied between the contact surfaces of the two.

[0053] like Figure 2As shown, in a preferred embodiment of the present invention, the automotive electronic coolant pump further includes a sealing ring 30 disposed between the volute 1 and the pump housing 2, the sealing ring 30 effectively improving the waterproof rating between the volute 1 and the pump housing 2.

[0054] The pump housing 2 of the automotive electronic water pump provided by this invention is a single unit. During installation, the entire motor 5 can be directly installed into the pump housing 2, making installation simpler and improving sealing. Coolant enters the first cooling channel from the pump water chamber, effectively lowering the temperature of the pump housing 2 surrounded by the cooling chamber 20. This reduces the temperature of the motor 5 and other electronic components located inside the pump housing 2, preventing burnout due to overheating and thus extending the service life of the electronic water pump.

[0055] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An automotive electric coolant water pump characterized by, The pump comprises a volute, an impeller, a pump shell, a motor and an end seat, the volute has a pump water chamber, the volute, the pump shell and the end seat are assembled into one body, the motor is assembled in the pump shell, the impeller is installed in the volute and is axially installed on the motor, wherein: An internal wall of the pump shell is provided with a cooling cavity which is not through the top and bottom of the pump shell and is circumferentially formed around the center line of the pump shell, the top of the pump shell is provided with a liquid inlet hole which is communicated with the pump water chamber and the cooling cavity, the side wall of the pump shell is provided with a liquid outlet hole which is communicated with the cooling cavity, the liquid inlet hole, the cooling cavity and the liquid outlet hole are communicated to form a first cooling channel; The cooling cavity is recessed to form a spiral annular groove in the direction of the center line near one side of the inner wall of the pump shell. The motor comprises an end plate, a rotor assembly, a stator assembly and a waterproof sleeve, the end plate is installed on the pump shell to block the opening of the pump shell, the rotor assembly has a rotating shaft, the rotating shaft is provided with a through liquid hole which is through the two end faces of the rotating shaft, one end of the waterproof sleeve is sleeved on the end plate and the other end is sleeved on the end seat, the end plate, the waterproof sleeve and the end seat are connected and separate the stator assembly and the rotor assembly into two areas which are not communicated with each other. The end seat extends from the bottom plate to the direction of the end plate to form a support with a mounting hole in the middle, the rotating shaft is fixedly installed in the mounting hole, and the support is provided with a liquid passing groove which is communicated with the mounting hole. One end of the rotating shaft is fixed on the end seat and the other end penetrates through the end plate, the impeller is axially installed on the rotating shaft and located in the pump water chamber. The end plate is provided with a liquid inlet which is communicated with the pump water chamber, and a liquid passing gap is formed between the outer wall of the rotor assembly and the inner wall of the waterproof sleeve and communicated with the liquid inlet. The pump water chamber is communicated with the liquid passing gap, the liquid passing groove and the through liquid hole through the liquid inlet to form a second cooling channel. The impeller comprises a hub, an impeller frame and a plurality of blades, each of the blades is arranged at intervals along the circumferential direction of the impeller frame, the intervals between the blades arranged at intervals are non-equidistant intervals which are not the same as each other, the hub is axially fixed on the rotating shaft, the top of the impeller frame is recessed to form an annular groove, and the volute is embedded in the annular groove.

2. The automotive electric water pump of claim 1, wherein The pump shell is integrally formed.

3. The automotive electric coolant water pump of claim 1, wherein, The end plate extends to form a mounting seat in the direction of the end seat, and the two ends of the waterproof sleeve are respectively sleeved on the mounting seat and the support. The waterproof sleeve comprises a sleeve body, a first connecting end and a second connecting end which are bent and extended from the two ends of the sleeve body, the first connecting end is sleeved on the mounting seat, and the cross section of the first connecting end is in a stepped structure; the second connecting end is sleeved on the support, and the second connecting end is provided with a rolled edge which is turned up towards the outer periphery of the sleeve body.

4. The automotive electric water pump of claim 3, wherein The sleeve body is in a straight cylindrical shape.

5. The automotive electric coolant water pump of claim 1, wherein, The rotor assembly comprises a rotor core and a sealing sleeve which is wrapped outside the rotor core, and the gap formed between the sealing sleeve and the waterproof sleeve is the liquid passing gap.

6. The automotive electric coolant water pump of claim 1, wherein, The peripheral side of the end plate is in interference fit with the side wall of the pump housing.

7. The automotive electric coolant water pump according to any one of claims 1 to 6, characterized in that A sealing ring is further included between the volute and the pump housing.

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