CN209458187U - Electronic water pump and vehicle with the electronic water pump - Google Patents

Abstract

The utility model relates to an electronic water pump and a vehicle with the electronic water pump, comprising a pump casing, a stator assembly, a rotor assembly, a rotor support body and a rotating shaft supported in the pump casing, and the rotating shaft is supported on the rotor support in a rotatable manner. In the central hole of the body, the impeller is supported in a non-rotatable manner at one end of the rotating shaft facing away from the inner cavity of the pump casing, and the rotor assembly is supported at the other end of the rotating shaft. A spacer sleeve is provided in the inner cavity of the pump casing to isolate The sleeve surrounds the rotor assembly and divides the pump casing interior into a first chamber and a second chamber, and the isolation sleeve is integrally constructed with the pump casing. Since the isolation sleeve and the pump housing are integrally constructed, the pump housing and the isolation sleeve can be molded at one time through injection molding, so the dimensional accuracy is better controlled. In addition, compared with the traditional solution, this new structure has better waterproof performance, even if it is subjected to long-term vibration, it will not affect its waterproof performance. In addition, there is no need to laboriously seal and fix the spacer sleeve and the pump casing, so material costs and manufacturing costs are reduced.

Description

Electronic water pump and vehicle with the electronic water pump

technical field

The utility model relates to the field of vehicle spare parts, in particular to an electronic water pump which is used for vehicles, especially for electric vehicles. In addition, the utility model also relates to a vehicle with the electronic water pump.

Background technique

The drive powertrain, power battery, and electric components used in electric vehicles are fundamentally different from traditional vehicles, in which the drive motor is used instead of the internal combustion engine. Electric vehicle water pumps use electric water pumps instead of traditional mechanical water pumps. Compared with traditional fuel vehicles, due to the addition of large heating components, such as power batteries, drive motors, motor control devices, chargers, etc., the cooling performance of electric vehicles has become extremely important. At present, electric water pumps are mainly used for circulating cooling of driving motors, electric components, power batteries, etc., and for circulating heating and circulating waterways under low temperature conditions in winter.

The electric water pump currently used is mainly composed of DC motor and impeller, pump body, pump cover, water retaining ring, pump shaft and other components. When the electric water pump is working, the DC motor drives the impeller to rotate. The coolant in the impeller is subjected to the centrifugal force generated by the rotation, and is thrown to the outlet of the impeller periphery, and a low-pressure area is generated in the center of the impeller, and the coolant is sucked from the inlet. A circulating flow is created in the system.

Various electronic water pumps of this type have been disclosed in the prior art. For example, a Chinese utility model patent CN206555143U discloses an electronic water pump, which includes a pump housing and a pump head. The pump housing is provided with a first chamber and a second chamber that are isolated from each other. In the first chamber, A stator, a rotor, and a shaft core are sequentially arranged from the outside to the inside, and a control device electrically connected to the stator is fixedly installed in the second chamber, and the gap between the first chamber and the second chamber is A metal isolation plate is provided, the control device is fixedly arranged on the metal isolation plate, and an insulating and heat-dissipating glue is arranged between the control device and the metal isolation plate.

In addition, a Chinese utility model patent CN207073469U discloses an anti-seize electronic water pump, which includes a pump base, a pump cover disposed on the pump base, and a stator disposed in the pump base. The rotor, the end of the rotor is provided with an impeller, the pump cover is provided with a water inlet channel and a water outlet channel, wherein a sealing groove is arranged at the notch of the accommodating groove on the stator, and the outer edge of the lower end of the impeller is placed in the sealing groove.

However, in most electronic water pumps in the prior art, the rotating shaft is injection-molded in the spacer sleeve, and a sealing ring is arranged between the spacer sleeve, the shell, and the volute, and a bearing is arranged in the inner hole of the rotor. Rotate on the shaft. In the electronic water pump with this structure, when the rotating shaft and the spacer sleeve are injected, there are problems such as verticality and coaxiality, and there are also problems such as the surface of the rotating shaft is easily scratched by the mold. In addition, during the operation of the electronic water pump, due to the poor verticality and coaxiality of the rotating shaft, there are defects such as high vibration, noise, poor stability and reliability, and poor coaxiality of the stator and rotor; at the same time, the sealing performance is also poor. Assembly More complexity results in higher manufacturing costs.

Utility model content

The purpose of this utility model is to provide an electronic water pump of the aforementioned type, which can solve one of the above-mentioned technical problems existing in the prior art with a smaller number of parts and thus less installation complexity and cost. item or items.

According to a solution of the utility model, the above object is achieved by an electronic water pump, which includes a pump casing, a stator assembly, a rotor assembly, and a rotor support body and a rotating shaft supported in the pump casing. The rotating shaft is rotatable The impeller is supported in the central hole of the rotor supporting body in a way that is opposite to the inner chamber of the pump casing, and the impeller is supported in a non-rotatable manner at the end of the shaft, and the rotor assembly is supported at the other end of the shaft, wherein, in the pump casing A spacer sleeve is arranged in the interior space, which partially surrounds the rotor assembly and separates the interior space of the pump housing into a first chamber and a second chamber, wherein the spacer sleeve is formed in one piece with the pump housing.

According to the above solution, since the spacer sleeve and the pump casing are integrally constructed, the pump casing and the spacer sleeve can be molded at one time by injection molding, so the dimensional accuracy is better controlled. In addition, compared with the traditional solution of setting two sealing rings, this new structure has better waterproof performance, even if it is subjected to long-term vibration during use, it will not affect its waterproof performance. In addition, according to the solution, at least one sealing ring can be reduced, and there is no need to laboriously seal and fix the spacer sleeve and the pump casing, so the material cost and manufacturing cost can be reduced.

Preferably, the rotating shaft is supported centrally in the rotor support body via bearings along its length direction. Due to this step-by-step approach of the rotating shaft, the supporting fixed point is located in the middle of the rotating shaft, and the load distribution of the rotating shaft is more balanced, so the noise is lower and the vibration is less during operation. As a result, the reliability of the electronic water pump is further improved.

According to an extension of the present invention, the rotor support body is fixedly connected to the pump casing, preferably by means of welding or glue, wherein at least one sealing ring is provided between the rotor support body and the pump casing. Therefore, on the one hand, the rotor support body and the pump casing are fixedly connected by welding or glue, and on the other hand, a sealing ring is provided on the joint surface of the rotor support body and the pump casing to achieve the purpose of waterproofing. Here, welding or gluing is only carried out at a few, preferably evenly distributed, connection points. As long as the fixed connection between the rotor support body and the pump housing is ensured, welding or gluing can of course also be carried out on the entire joint surface in the circumferential direction.

Preferably, the stator assembly is fastened outside the pump casing or fastened outside the spacer sleeve in the inner chamber of the pump casing. In this case, the stator assembly is arranged either on the outside of the pump housing or around a spacer sleeve in the interior of the pump housing. In both arrangements, the stator assembly is arranged coaxially around the rotor, so that the stator interacts magnetically with the stator, especially when the electric water pump is energized.

Preferably, a control device electrically connected to the stator assembly is fixedly arranged in the second chamber of the inner cavity of the pump casing, and the control device is fixedly arranged on the rear sealing cover plate of the electronic water pump. The rear sealing cover is preferably made of a metal with good thermal conductivity, and in particular, an insulating and heat-dissipating glue can be arranged between the control device and the rear sealing cover.

According to a preferred development, the electronic water pump also includes a vibration damping pad, which is fixedly connected to the rear sealing cover. The vibration damping pad can further reduce the noise and vibration of the electronic water pump during operation.

Preferably, the volute of the electronic water pump is fixedly connected to the pump casing through a threaded connection, wherein a sealing ring is provided between the volute and the pump casing, wherein a water inlet and a water outlet are configured on the volute.

It is particularly advantageous if the rotor support and the receptacle of the pump housing for receiving the rotor support have a positive fit in the form of a bearing flange and a bearing cam. Thus, due to the form-fitting structure, the support flange can be quickly placed in the correct position during installation, which simplifies the installation process.

Preferably, the rotating shaft is configured symmetrically, in particular in the longitudinal direction, as a stepped shaft, wherein the diameter of the middle section of the stepped shaft corresponds to the inner diameter of the bearing in the rotor support, and the diameter of the two end sections of the stepped shaft is the same and smaller than the diameter of the middle section. By designing the rotor shaft as a stepped shaft, on the one hand its weight and material requirements are reduced, and on the other hand the rotor assembly and the impeller can be positioned longitudinally via the shaft shoulder without additional components.

Finally, the utility model also relates to a vehicle, especially an electric vehicle, which includes at least one electronic water pump according to the utility model.

Description of drawings

Additional features and advantages of the invention are given by the following description of preferred exemplary embodiments with the aid of the drawings.

The embodiment shown in the figure is only a possible implementation of the utility model, and the features included in the specification, claims and drawings can also be combined in different ways to obtain other different solutions.

The accompanying drawings show:

Fig. 1 is a sectional view of an electronic water pump according to the prior art;

Fig. 2 is a section of the electronic water pump according to the utility model.

Detailed ways

FIG. 1 shows a sectional view of an electronic water pump according to the prior art. The conventional structure of the existing electronic water pump can be known from this sectional view. As shown in FIG. 1 , the electronic water pump includes a pump casing 11 and a volute, and a water inlet 12 and a water outlet are configured on the volute. A partition 6 is arranged inside the pump casing 11 , and the partition 6 divides the inner chamber of the pump casing 11 into a first chamber 111 and a second chamber 112 which are isolated from each other. The stator assembly 2, the rotor assembly 3 and the rotating shaft 4 are arranged in the first chamber 111, and the controller 5 electrically connected with the stator assembly 2 is fixedly arranged in the second chamber 112, and the controller 5 is fixedly arranged On the partition 6 , an insulating and heat-dissipating glue 7 is provided between the controller 5 and the partition 6 . The rotor assembly 3 is rotatably supported on the rotating shaft 4 through bearings 31 , 32 , and a cooling cavity 33 is formed between the bearings 31 , 32 . The impeller 8 is formed in one piece with the extension of the rotor assembly and is therefore likewise mounted via bearings on the rotary shaft 4 . The disc of the impeller 8 is formed with labyrinth grooves 81, 82, 83. The labyrinth grooves prevent the water inlet of the volute from being directly connected with the water outlet channel on the volute, thereby preventing the backwater effect and ensuring that the water entering from the water inlet can be maximized. Flow out from the outlet. In the first chamber 111, the spacer sleeve surrounds the rotor assembly 3, the stator assembly 2 is arranged around the rotor assembly 2 outside the spacer sleeve, the flange of the spacer sleeve is clamped between the volute and the pump casing 11, and Sealing rings are respectively provided between the volute and the spacer and between the spacer and the pump casing 11 . The second chamber 112 is closed by a rear sealing cover.

FIG. 2 shows a partial sectional view of the electronic water pump 1 according to the invention. For the sake of clarity, the volute and the rear sealing cover are not shown in FIG. 2 , and reference can be made to the relevant structure in FIG. 1 in this regard. For ease of comparison, identical or functionally identical parts have been given the same reference numerals.

As shown in FIG. 2 , the electronic water pump 1 includes a pump casing 11 , a stator assembly 2 , a rotor assembly 3 , and a rotor support 9 and a rotating shaft 4 supported in the pump casing 11 . The rotor support 9 and the receptacle of the pump housing 11 for receiving the rotor support 9 have form-fitting structures, such as bearing flanges and corresponding bearing bosses. The rotor support 9 is fastened to the pump housing 11 by form-fit means, for example by welding or gluing, wherein at least one sealing ring is arranged between the rotor support 9 and the pump housing 11 . On the one hand, the rotor support body is fixedly connected to the pump casing by welding or glue, and on the other hand, the purpose of waterproofing is achieved by setting a sealing ring on the joint surface of the rotor support body and the pump casing. Here, the fastening can be carried out by welding or gluing only at one or a few connection points which are preferably evenly distributed, or welding or gluing can be carried out on the entire joining surface in the circumferential direction.

The shaft 4 is rotatably mounted in a central bore of the rotor support 9 via a preferably self-lubricating bearing 13 . The rotating shaft 4 supports an impeller 8 in a non-rotatable manner at one end facing away from the inner chamber of the pump casing, and a rotor assembly 3 is supported at the other end of the rotating shaft 4, wherein a spacer sleeve 10 is provided in the inner chamber of the pump casing. , the spacer sleeve 10 partially surrounds the rotor and divides the inner chamber of the pump housing into a first chamber 111 and a second chamber 112 , wherein the spacer sleeve 10 is integrally formed with the pump housing 11 . During the manufacturing process, the pump housing 11 and the spacer sleeve 10 can be molded at one time through injection molding, so the dimensional accuracy is better controlled. In addition, compared with the traditional solution of setting two sealing rings, this new structure has better waterproof performance, even if it is subjected to long-term vibration during use, it will not affect its waterproof performance.

Here, the stator assembly 2 can be fastened on the outside of the pump casing 11 , or can be fastened on the outside of the spacer sleeve 10 in the inner chamber of the pump casing. In both arrangements, the stator assembly 2 is coaxially arranged around the rotor assembly 3, so that the stators interact magnetically with each other, especially when the electric water pump 1 is powered on.

A control device 5 electrically connected to the stator assembly 2 is fixedly arranged in the second chamber 112 of the inner chamber of the pump casing, and the control device 5 is fixedly arranged on the rear sealing cover plate. The rear sealing cover is preferably made of a metal with good thermal conductivity, and in particular, an insulating heat-dissipating glue can be arranged between the control device 5 and the rear sealing cover. The rear sealing cover plate can also be fixedly connected with a vibration damping pad. The vibration damping pad can further reduce the noise and vibration of the electronic water pump during operation.

The volute of the electronic water pump 1 is fixedly connected to the pump casing 11 through a threaded connection, wherein at least one sealing ring is provided between the volute and the pump casing 11 , wherein a water inlet 12 and a water outlet are configured on the volute.

Although not shown in detail, in order to further reduce noise and vibration during operation of the electric water pump 1 , the shaft 4 may be centrally supported in the rotor support body 9 via bearings along its length direction. Due to the steps of the rotating shaft 4, the supporting fixed point is located in the middle of the rotating shaft 4, and the load distribution of the rotating shaft 4 is more balanced, so that the reliability of the electronic water pump 1 is further improved. In addition, the rotary shaft 4 can be configured longitudinally symmetrically about its center as a stepped shaft. By designing the rotating shaft 4 as a stepped shaft, on the one hand its weight and material requirements are reduced, and on the other hand the rotor assembly 3 and the impeller 8 can be positioned longitudinally via the shaft shoulders without additional components.

It should be noted that, in this document, the terms "comprising", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or apparatus.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the design of the present utility model, but the present utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these variations and improvements are also regarded as the protection scope of the present utility model.

Claims (10)

1. An electronic water pump (1), comprising a pump casing (11), a stator assembly (2), a rotor assembly (3) and a rotor support (9) and a rotating shaft ( 4), the rotating shaft (4) is rotatably supported in the central hole of the rotor support body (9), and the impeller is supported in a relatively non-rotatable manner on the end of the rotating shaft (4) facing away from the inner chamber of the pump casing (8), and the rotor assembly (3) is supported at the other end of the rotating shaft (4), which is characterized in that a spacer (10) is provided in the inner cavity of the pump casing, and the spacer (10) surrounds the rotor assembly (3) and divide the inner cavity of the pump casing into a first chamber (111) and a second chamber (112), wherein the spacer sleeve (10) is integrally constructed with the pump casing (11). 2 . The electronic water pump ( 1 ) according to claim 1 , characterized in that, the rotating shaft ( 4 ) is centrally supported in the rotor supporting body ( 9 ) through bearings along its length direction. 3 . 3. The electronic water pump (1) according to claim 1 or 2, characterized in that, the rotor support (9) is fixedly connected to the pump casing (11), wherein, between the rotor support (9) and At least one sealing ring is arranged between the pump casings (11). 4. The electronic water pump (1) according to claim 1 or 2, characterized in that, the stator assembly (2) is fastened on the outside of the pump casing (11) or fastened to a spacer sleeve in the inner cavity of the pump casing (10) OUTSIDE. 5. The electronic water pump (1) according to claim 1 or 2, characterized in that, a control device electrically connected to the stator assembly (2) is fixedly arranged in the second chamber (112) of the inner chamber of the pump housing (5), the control device (5) is fixedly arranged on the rear sealing cover plate of the electronic water pump. 6. The electronic water pump (1) according to claim 1 or 2, characterized in that the electronic water pump further comprises a vibration damping pad, and the vibration damping pad is fixedly connected with the rear sealing cover plate. 7. The electronic water pump (1) according to claim 1 or 2, characterized in that, the volute of the electronic water pump (1) is fixedly connected with the pump casing (11) through a threaded connection, wherein, between the volute and the pump A sealing ring is provided between the casings (11), wherein a water inlet (12) and a water outlet are configured on the volute. 8. The electronic water pump (1) according to claim 1 or 2, characterized in that, the receiving part of the rotor support body (9) and the pump casing (11) for receiving the rotor support body (9) has the form It is a form-fitting structure of the support flange and the corresponding support boss. 9. The electronic water pump (1) according to claim 1 or 2, characterized in that the shaft (4) is symmetrically configured as a stepped shaft, wherein the diameter of the middle section of the stepped shaft is the same as that of the rotor support ( Corresponding to the inner diameter of the bearing in 9), the diameters of the two end sections of the stepped shaft are the same and smaller than the diameter of the middle section. 10. A vehicle, characterized in that it has at least one electronic water pump (1) according to any one of the preceding claims.