Pump cover for reducing pulsating pressure and electronic water pump using same

Abstract

The utility model discloses a pump cover capable of reducing pulsating pressure and an electronic water pump using the same, and relates to the technical field of electronic water pumps and parts thereof, and a liquid medium flow guide part used for guiding the flowing direction of a liquid medium is formed on the inner side of a pump cover body; a water outlet is further formed in the pump cover body, and an inlet of the water outlet is connected to the tail end of the liquid medium flow guide part; a baffle tongue part is formed at the tail end of the liquid medium flow guide part, and the baffle tongue part is configured to be of a step-shaped structure. The utility model mainly solves the problem of improving the structure of the baffle tongue at the pump cover of the electronic water pump; when the liquid medium reaches the baffle tongue part, the baffle tongue part is configured to be of a step-shaped structure, so that the liquid medium can smoothly pass through the baffle tongue part, the axial impact acceleration of the liquid medium to the baffle tongue part is reduced, and the treated baffle tongue part greatly reduces the pressure pulsation of the liquid medium; and vibration and noise of the electronic water pump are effectively avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic water pumps and their components, specifically a pump cover for reducing pulsating pressure and an electronic water pump using the same. Background Technology

[0002] Electric water pumps have high output efficiency and can achieve precise flow control. Therefore, they are widely used in automobiles, home appliances and industrial equipment. In particular, new energy vehicles usually have two or more electric water pumps. The electric water pump is the power source of the entire cooling system of new energy vehicles. The power battery, drive motor and other components of new energy vehicles all rely on the electric water pump to drive the coolant for circulation and cooling.

[0003] The pump cover is one of the important components of an electric water pump. It not only forms part of the outer shell, but more importantly, the inlet and outlet of the electric water pump are both located on the pump cover, which forms the main inlet and outlet channels of the electric water pump. In addition, a flow guiding structure is formed on the inner side of the pump cover. This flow guiding structure can guide the flow direction of the liquid medium in the chamber of the electric water pump, thereby improving the performance of the electric water pump.

[0004] like Figure 1 As shown, in existing electronic water pumps, the flow guiding structure formed by the pump cover 1 still has certain drawbacks: In order to improve the efficiency of the electronic water pump, the pump cover 1 is generally equipped with a baffle 2. However, with the rapid development of the new energy vehicle industry, the requirements for lightweight and high efficiency of electronic water pumps have been put forward, which makes the impeller of the electronic water pump rotate at a high speed during operation. Every time the impeller rotates, its blades will have strong dynamic and static interference with the baffle 2, which will cause the liquid medium to generate pulsating pressure. This pulsating pressure will cause the electronic water pump to vibrate and generate noise.

[0005] In conclusion, in order to reduce the vibration and noise of the electric water pump, it is necessary to improve the structure of the tongue at the pump cover. Utility Model Content

[0006] The purpose of this invention is to provide a pump cover that reduces pulsating pressure and an electronic water pump that uses the same. The improved tongue portion can reduce the pressure pulsation of the liquid medium.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a pump cover for reducing pulsating pressure, comprising a pump cover body; a liquid medium guide portion is formed on the inner side of the pump cover body for guiding the flow direction of the liquid medium; the pump cover body also forms an outlet, the inlet of which is connected to the end of the liquid medium guide portion; a tongue portion is formed at the end of the liquid medium guide portion, and the tongue portion is configured as a stepped structure.

[0008] In the technical solution, the tongue portion comprises a root step connected to the inner wall of the pump cover body, and an end step superposed on the root step.

[0009] In the technical solution, the liquid medium flow guide portion of the pump cover body is configured as a spiral flow guide spiral wall with the head connected to the tail.

[0010] In the technical solution, the liquid medium flow guide portion of the pump cover body has a flow guide inner cavity on the inner side of the flow guide spiral wall.

[0011] In the technical solution, the water inlet is coaxial with the liquid medium flow guide portion.

[0012] In the technical solution, a central axis L1 is defined, which passes through at least the axis of the water inlet and the inlet of the water outlet; a root step connecting line L2 is defined, which passes through at least the axis of the water inlet and the end face of the root step of the tongue portion; an end step connecting line L3 is defined, which passes through at least the axis of the water inlet and the end face of the end step of the tongue portion; and the central axis L1 and the root step connecting line L2 have an included angle θ a 1 in space, and the central axis L1 and the end step connecting line L3 have an included angle θ b 1 in space.

[0013] In the technical solution, the included angle θ a 1 is 20°-30°.

[0014] In the technical solution, the included angle θ b 1 is 30°-40°.

[0015] In the technical solution, the end faces of the root step and the end step of the tongue portion are configured as chamfered structures or rounded structures.

[0016] An electronic water pump comprises the pump cover for reducing pulsation pressure.

[0017] Compared with the prior art, the pump cover for reducing pulsation pressure and the electronic water pump using the same have the following beneficial effects: when the liquid medium reaches the tongue portion, the liquid medium can smoothly pass through the tongue portion due to the stepped structure of the tongue portion, so that the axial impact acceleration of the liquid medium on the tongue portion is reduced, the pressure pulsation of the liquid medium is greatly reduced by the processed tongue portion, and vibration and noise of the electronic water pump are effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural view of a pump cover in the prior art.

[0019] Figure 2 is a structural view of the utility model.

[0020] Figure 3 is a structural view of the utility model.

[0021] The reference signs are: 10, pump cover body; 101, water inlet; 102, water outlet; 20, liquid medium flow guide part; 201, flow guide spiral wall; 202, flow guide inner cavity; 203, tongue part; 203a, root step; 203b, end step. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] The embodiment provides a pump cover for reducing pulsating pressure, which can be applied to an electronic water pump and forms a cavity and guides the flow direction of liquid medium in the cavity as a housing component of the electronic water pump.

[0024] Please refer to Figure 2 and Figure 3 The pump cover for reducing pulsating pressure in the embodiment comprises a pump cover body 1.

[0025] The pump cover body 1 is an integrally injection molded engineering plastic cover body, or can also be an integrally die-cast or integrally machined metal cover body.

[0026] The inner side of the pump cover body 1 forms a liquid medium flow guide part 2 for guiding the flow direction of liquid medium.

[0027] The pump cover body 1 is further formed with a water outlet 12, which is actually a short pipe-shaped structure feature integrally formed at the pump cover body 1 and communicates the inner and outer sides of the pump cover body 1, and the inlet of the water outlet 12 is connected to the end of the liquid medium flow guide part 2.

[0028] The end of the liquid medium flow guide part 2 forms a tongue part 23, which is actually a convex rib-shaped structure feature integrally formed at the inner wall of the pump cover body 1, and the tongue part 23 is configured as a stepped structure.

[0029] Specifically, the baffle portion 23 comprises a root step 231 connected to the inner wall of the pump cover body 1, and an end step 232 superposed on the root step 231, in this way, the baffle portion 23 is configured as a two-stage step structure; in fact, the inner wall of the pump cover body 1 is pulled up to form the root step 231, and a part of the root step 231 is further pulled up to form the end step 232.

[0030] Further specifically, in order to guide the flow direction of the liquid medium, the liquid medium guide portion 2 of the pump cover body 1 is configured as a spiral and end-to-end guide spiral wall 21, wherein the end-to-end specifically refers to that the two ends of the guide spiral wall 21 are misaligned to connect, so as to form an opening at the end of the guide spiral wall 21.

[0031] Further specifically, the liquid medium guide portion 2 of the pump cover body 1 has a guide inner cavity 22 on the inner side of the guide spiral wall 21, in fact, the guide inner cavity 22 is an arc-shaped inner recess structure feature integrally formed on the inner wall of the pump cover body 1 and located on the inner side of the guide spiral wall 21, through which the liquid medium can be provided with sufficient flow space.

[0032] Specifically, the pump cover body 1 is formed with a water inlet 11 coaxial with the liquid medium guide portion 2, in fact, the water inlet 11 is a short tubular structure feature integrally formed on the pump cover body 1, which communicates the inside and outside of the pump cover body 1.

[0033] Please refer to Figure 2 Further, a central axis L1 is defined, which at least passes through the axis of the water inlet 11 and the inlet of the water outlet 12; a root step 231 connecting line L2 is defined, which at least passes through the axis of the water inlet 11 and the end face of the root step 231 of the baffle portion 23; an end step 232 connecting line L3 is defined, which at least passes through the axis of the water inlet 11 and the end face of the end step 232 of the baffle portion 23; then: the central axis L1 and the root step 231 connecting line L2 have an included angle θ a between them in space, and the central axis L1 and the end step 232 connecting line L3 have an included angle θ b between them in space.

[0034] It should be noted that the central axis L1 is perpendicular to the axis of the water inlet 11 and passes through the geometric midpoint of the inlet of the water outlet 12; the root step 231 connecting line L2 is perpendicular to the axis of the water inlet 11 and passes through the geometric midpoint of the end face of the root step 231 of the baffle portion 23; the end step 232 connecting line L3 is perpendicular to the axis of the water inlet 11 and passes through the geometric midpoint of the end face of the end step 232 of the baffle portion 23; the included angle θ a, specifically, the included angle of the projection of the connecting line L2 between the central axis L1 and the root step 231 on the horizontal plane (the plane perpendicular to the central axis L1); the included angle θ of the connecting line L2 between the central axis L1 and the root step 231 b , specifically, the included angle of the projection of the connecting line L3 between the central axis L1 and the end step 232 on the horizontal plane (the plane perpendicular to the central axis L1).

[0035] Further specifically, the included angle θ a is 20°-30°, and in the embodiment, the included angle θ a is 25°.

[0036] Further specifically, the included angle θ b is 30°-40°, and in the embodiment, the included angle θ b is 35°.

[0037] Further, the root step 231 and the end step 232 of the baffle portion 23 are configured with chamfered / cornered structures at the end faces, and the chamfered / cornered structures are actually integrally formed with the root step 231 and the end step 232 respectively; the configuration of the chamfered / cornered structures at the end faces of the root step 231 and the end step 232 can reduce the drag coefficient of the liquid medium when passing through the root step 231 and / or the end step 232, so as to further reduce the pressure pulsation of the liquid medium.

[0038] The embodiment also provides an electronic water pump comprising the pump cover for reducing pressure pulsation.

[0039] When the impeller assembly of the electronic water pump is in operation, the liquid medium can be driven to flow, so that a negative pressure is formed at the water inlet 11 of the pump cover body 1, and the liquid medium outside the electronic water pump can be sucked into the pump cover body 1 through the water inlet 11 and reach the flow guide inner cavity 22; the liquid medium in the flow guide inner cavity 22 flows under the driving of the impeller assembly and is guided by the flow guide spiral wall 21 to reach the water outlet 12 of the pump cover body 1, so as to be discharged to the outside of the water outlet 12 at a certain pressure; in the above process, when the liquid medium reaches the baffle portion 23, the baffle portion 23 is configured in a stepped structure, so that the liquid medium can smoothly pass through the baffle portion 23, the axial impact acceleration of the liquid medium on the baffle portion 23 is reduced, the processed baffle portion 23 greatly reduces the pressure pulsation of the liquid medium, and vibration and noise of the electronic water pump are effectively avoided.

[0040] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A pump cover for reducing pulsating pressure, comprising a pump cover body; characterized in that, The inner side of the pump cover body forms a liquid medium guide section for guiding the flow direction of the liquid medium. The pump cover body also has a water outlet, and the inlet of the water outlet is connected to the end of the liquid medium guiding part; The end of the liquid medium guide portion forms a tongue portion, and the tongue portion is configured as a stepped structure.

2. The pump cover for reducing pulsating pressure according to claim 1, characterized in that, The tongue portion includes a root step connected to the inner wall of the pump cover body, and an end step stacked on the root step.

3. The pump cover for reducing pulsating pressure according to claim 2, characterized in that, The liquid medium guiding portion of the pump cover body is configured as a spiral-shaped guiding spiral wall with the ends connected.

4. The pump cover for reducing pulsating pressure according to claim 3, characterized in that, The liquid medium guiding portion of the pump cover body has a guiding inner cavity on the inner side of the guiding spiral wall.

5. The pump cover for reducing pulsating pressure according to claim 3 or 4, characterized in that, The pump cover body has an inlet that is coaxial with the liquid medium guide portion.

6. The pump cover for reducing pulsating pressure according to claim 5, characterized in that, Define a central axis L1, which passes through at least the axis of the inlet and the inlet of the outlet; Define a root step line L2, which passes through at least the axis of the inlet and the end face of the root step of the tongue portion. Define an end step line L3, which passes through at least the axis of the inlet and the end face of the end step of the tongue portion; Therefore: the central axis L1 and the line L2 connecting the root step have an angle θ in space. a The central axis L1 and the line L3 connecting the end step form an angle θ in space. b .

7. The pump cover for reducing pulsating pressure according to claim 6, characterized in that, The included angle θ a The angle is 20° to 30°.

8. The pump cover for reducing pulsating pressure according to claim 6, characterized in that, The included angle θ b The angle is 30° to 40°.

9. The pump cover for reducing pulsating pressure according to claim 2, characterized in that, The root step and end step of the tongue portion are both configured with chamfered / rounded corner structures on their end faces.

10. An electronic water pump, characterized in that, It includes the pump cover for reducing pulsating pressure as described in any one of claims 1-9.

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