Variable flow multi-working condition automobile water pump volute and die thereof

Abstract

The application relates to a variable-flow multi-working-condition automobile water pump volute and a die thereof, wherein the inner diameter of a first inlet pipe is not equal to the inner diameter of a second inlet pipe, a plug is located in an outlet flow channel of a pressure jet structure, and a buffer camber is arranged at the connection position of an outer jet surface and a volute inlet section; the structure increases the adjustment margin of the inlet flow, realizes variable-flow multi-working-condition operation, the profile lines of the volute inlet section and a volute outlet transition section are in arc line type, the profile line of a volute flow section is in hyperbolic type, the central angle of the volute flow section is A, wherein 120 DEG < A < 180 DEG, vibration is more effectively reduced, noise is reduced, the volute comprises a first half volute and a second half volute, a first die body assembly and a second die body assembly, a die similar to a split pump shell is adopted, subsequent maintenance cost is effectively reduced, and the service life of the automobile water pump is prolonged.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, specifically to a volute for a water pump, and more specifically to a volute for a variable flow, multi-condition automotive water pump and its mold. Background Technology

[0002] The automotive water pump is a core component of the engine cooling system. Its main function is to drive the circulation of coolant between the engine water passages, radiator, and other cooling components, helping to maintain the engine within a suitable operating temperature range and preventing overheating that could lead to performance degradation, mechanical failure, or even damage. Centrifugal water pumps are widely used in automotive engines, and their operating efficiency directly determines the engine's cooling effect. Existing automotive water pumps on the market typically have poor water flow stability at low speeds and idle, generate significant noise and vibration, and are difficult to maintain. As demands for automotive water pumps increase, the need for performance improvements is growing. Therefore, optimizing the design of automotive water pumps is essential.

[0003] Existing technology CN103195745A discloses a cooling water pump for new energy vehicles, including a rear end cover 1, an O-ring I2, a control board 3, a pump housing 4, a motor (stator 5 and rotor 10), an O-ring II6, a bushing 7, an impeller shaft 8, a shock-absorbing sleeve 9, an impeller housing 11, an impeller 17, an impeller cover 12, an impeller retaining ring 13, a front end cover 14, and a pump terminal block 15. The impeller of this invention is a centrifugal impeller, and the motor is a sensorless brushless DC motor. The armature winding, as the stator of the motor, is integrated with the pump housing, and the permanent magnet, as the rotor of the motor, is integrated with the impeller housing. This design improves the pump head, reduces the energy consumption and cost of new energy vehicles, and effectively extends the service life of the pump.

[0004] Existing technology CN108555248A discloses a casting method and casting mold for automotive engine water pump housings. Through steps such as mold making, sand core assembly and mold closing, pouring, cooling and shaping, and product inspection, it achieves rapid and precise casting of automotive engine water pump housings, solving the problems of complex casting processes and poor internal cavity forming effects in existing technologies. The casting method for automotive engine water pump housings of this invention has advantages such as simple process, short time, and high precision.

[0005] However, the above structure has design limitations, involving only the design of some simple shells and molds, and the improvement effect on the pump body's operating performance is generally limited. Considering that the internal water channel structure of the automotive engine water pump shell is relatively complex, there are problems such as poor performance, high noise and vibration, and difficult maintenance. Therefore, in order to address these problems, the applicant proposes a volute shell and its mold for a variable flow multi-condition automotive water pump. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a volute housing and its mold for a variable flow rate multi-condition automotive water pump.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A variable flow rate, multi-condition automotive water pump volute includes a first half-volute and a second half-volute, which are connected and assembled into a volute using a connector. The first half-volute includes a first inlet pipe, a volute inlet section, a volute outlet transition section, a volute outlet pipe, and a pressurized jet structure; the second half-volute includes a second inlet pipe and a volute flow passage. The volute inlet section, the volute flow passage, and the volute outlet transition section are sequentially connected to form a rotary pressurized flow path, wherein the outlines of the volute inlet section and the volute outlet transition section are arc-shaped, and the volute flow passage... The outline is hyperbolic, and the central angle of the volute flow section is A, where 120° < A < 180°; the inner diameter of the first inlet pipe is not equal to the inner diameter of the second inlet pipe; one end of the pressurized jet structure is connected to the volute inlet section, and the other end is connected to the volute outlet pipe. The pressurized jet structure includes an inner guide surface near the tongue, an outer jet surface away from the tongue, and an insert for automatically adjusting the flow area. The insert is located in the outlet flow channel of the pressurized jet structure. Both the inner guide surface and the outer jet surface are tangentially connected to the volute outlet pipe. A buffer arc surface is provided at the connection between the outer jet surface and the volute inlet section.

[0009] Furthermore, the inner diameter of the first inlet pipe is D1, and the inner diameter of the second inlet pipe is D2, where D1 > D2.

[0010] Furthermore, a pressure sensor is provided on the surface of the plug and is connected to the controller circuit to control the opening and closing angle of the plug.

[0011] Furthermore, the flow channel of the pressurized jet structure has a tapering structure along the flow direction.

[0012] Furthermore, a pressure plate is provided on the inlet side of the inner drainage surface at a position corresponding to the buffer arc surface. The pressure plate is a flat plate structure.

[0013] Furthermore, the angle between the booster plate and the inner drainage surface is 10° to 30°.

[0014] Furthermore, radially, the inlet end of the inner drainage surface is closer to the center of the volute than the inlet end of the outer jet surface.

[0015] A mold for a volute housing of a variable flow, multi-condition automotive water pump includes: a first mold assembly comprising a first mold base and a first mold core disposed inside the first mold base, the first mold base and the first mold core being adapted to the shell structure of a first half-volute housing; a second mold assembly comprising a second mold base and a second mold core disposed inside the second mold base, the second mold base and the second mold core being adapted to the shell structure of a second half-volute housing; the first mold core and the second mold core, when molded together, form the cavity of the volute housing; characterized in that it further includes a core-pulling structure, which is respectively disposed within the first mold assembly and the second mold assembly. The core-pulling structure includes multiple core-pulling sliders adapted to the volute housing, which are used to pull out from the cavity during mold opening to form the internal structure of the volute housing; a positioning structure, which is disposed between the first mold assembly and the second mold assembly, is used to accurately position the first mold assembly and the second mold assembly during mold closing to ensure the dimensional accuracy of the cavity; a cooling structure, which is disposed within the first mold assembly and the second mold assembly, includes cooling channels that surround the cavity to cool the mold during manufacturing and accelerate the volute housing forming speed; the volute housing adopts the aforementioned variable flow multi-condition automotive water pump volute housing.

[0016] Furthermore, both the first mold core and the second mold core are provided with a release coating, which is a titanium nitride or molybdenum disulfide coating.

[0017] Furthermore, limit blocks are provided on both the first mold base and the second mold base. The limit blocks are used to limit the travel of the core-pulling slider to ensure that the core-pulling slider accurately reaches the working position and the extraction position.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The inner diameter of the first inlet pipe is not equal to that of the second inlet pipe; the pressurized jet structure includes an inner guide surface near the tongue, an outer jet surface away from the tongue, and an insert for automatically adjusting the flow area. The insert is located in the outlet flow channel of the pressurized jet structure. Both the inner guide surface and the outer jet surface are tangentially connected to the volute outlet pipe. A buffer arc surface is provided at the connection between the outer jet surface and the volute inlet section; a pressure sensor is provided on the surface of the insert and connected to the controller circuit to control the opening and closing angle of the insert; compared with the single inlet of the existing car water pump without adjustment function, the applicant uses two inlet pipes, adds a pressurized jet structure, and sets an insert structure in the outlet flow channel to facilitate flow path adjustment. This structure increases the adjustment margin of the inlet flow, realizes variable flow multi-condition operation, and has a good effect on stabilizing water flow at low speed and idle speed, which greatly improves the operating efficiency of the car water pump.

[0020] 2. The contour lines of the inlet and outlet transition sections of the volute are arc-shaped, while the contour line of the flow passage section is hyperbolic. The central angle of the flow passage section is A, where 120° < A < 180°. The streamline structure inside the volute is one of the factors affecting the noise and vibration of the water pump. Considering the manufacturing effect of the mold, the applicant adopted an optimized volute structure combining arc and hyperbolic shapes for the design of the split pump casing, which more effectively reduced vibration and thus noise. In addition, considering that the first half of the volute is subjected to greater force, the applicant optimized the size ratio of the second half of the volute, so that the first half of the volute has a larger mass and a more stable center of gravity, and the noise and vibration are naturally reduced accordingly.

[0021] 3. The system includes a first half-volute and a second half-volute, a first mold assembly comprising a first mold base and a first mold core disposed inside the first mold base, the first mold base and the first mold core being adapted to the shell structure of the first half-volute; a second mold assembly comprising a second mold base and a second mold core disposed inside the second mold base, the second mold base and the second mold core being adapted to the shell structure of the second half-volute; the first mold core and the second mold core are molded together to form the cavity of the volute; given the difficulty of repairing existing automotive water pumps, especially the damage to internal rotating parts such as impellers, the applicant uses a mold similar to that of a split pump housing, effectively reducing subsequent maintenance costs and improving the service life of the automotive water pump. Attached Figure Description

[0022] Figure 1 This is an axial cross-sectional view of the car water pump of the present invention;

[0023] Figure 2 This is a radial cross-sectional view of the volute casing of the present invention;

[0024] Figure 3 This is an enlarged schematic diagram of the pressurized jet structure of the present invention.

[0025] In the diagram: First half-volute 1, Second half-volute 2, First inlet pipe 11, Volute inlet section 12, Volute outlet transition section 13, Volute outlet pipe 14, Pressurized jet structure 15, Second inlet pipe 21, Volute flow passage section 22, Inner guide surface 151, Outer jet surface 152, Insert 153, Pressurized plate 1511, Buffer arc surface 1521, Central angle A of volute flow passage section 22, Inner diameter D1 of first inlet pipe 11, Inner diameter D2 of second inlet pipe 21. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] like Figure 1-3 As shown, a variable flow rate multi-condition automotive water pump volute includes a first half-volute 1 and a second half-volute 2, which are connected and assembled into a volute using connectors. The first half-volute 1 includes a first inlet pipe 11, a volute inlet section 12, a volute outlet transition section 13, a volute outlet pipe 14, and a pressurized jet structure 15. The second half-volute 2 includes a second inlet pipe 21 and a volute flow passage 22. The volute inlet section 12, the volute flow passage 22, and the volute outlet transition section 13 are sequentially connected to form a rotary pressurized flow path. The outlines of the volute inlet section 12 and the volute outlet transition section 13 are arc-shaped, and the outline of the volute flow passage 22 is double-curved. The volute flow section 22 is curved, with a central angle of A, where 120° < A < 180°. The inner diameter of the first inlet pipe 11 is not equal to the inner diameter of the second inlet pipe 21. One end of the pressurized jet structure 15 is connected to the volute inlet section 12, and the other end is connected to the volute outlet pipe 14. The pressurized jet structure 15 includes an inner guide surface 151 near the tongue, an outer jet surface 152 away from the tongue, and an insert 153 that automatically adjusts the flow area. The insert 153 is located in the outlet flow channel of the pressurized jet structure 15. The inner guide surface 151 and the outer jet surface 152 are both tangentially connected to the volute outlet pipe 14. A buffer arc surface 1521 is provided at the connection between the outer jet surface 152 and the volute inlet section 12.

[0029] Furthermore, the inner diameter of the first inlet pipe 11 is D1, and the inner diameter of the second inlet pipe 21 is D2, where D1 > D2.

[0030] Using a combination of the first inlet pipe and the second inlet pipe is beneficial for achieving variable flow rate under multiple operating conditions, and also helps to broaden the range of flow margin.

[0031] Furthermore, a pressure sensor is provided on the surface of the plug 153 and is connected to the controller circuit to control the opening and closing angle of the plug 153.

[0032] Furthermore, the flow channel of the pressurized jet structure 15 has a tapered structure along the flow direction.

[0033] The narrowing of the flow channel accelerates the flow of fluid and can effectively eject the fluid in the volute outlet pipe 14, thereby improving the engine's cooling efficiency.

[0034] Furthermore, a pressure plate 1511 is provided on the inlet side of the inner drainage surface 151 at a position corresponding to the buffer arc surface 1521. The pressure plate 1511 is a flat plate structure.

[0035] Furthermore, the angle between the booster plate 1511 and the inner drainage surface 151 is 10° to 30°.

[0036] The buffer arc surface and the pressure plate complement each other, which is more conducive to stabilizing the inlet flow and reducing vibration and noise.

[0037] Furthermore, in the radial direction, the inlet end of the inner drainage surface 151 is closer to the center of the volute than the inlet end of the outer jet surface 152.

[0038] The inner flow guide surface 151 is close to the inner side of the center of the volute, which is more conducive to reducing the impact of the vortex of the tongue part on the pressurized jet structure 15. In addition, it is also conducive to better introducing the fluid into the pressurized jet structure 15, thereby improving the jet effect.

[0039] A mold for a volute housing of a variable flow, multi-condition automotive water pump includes: a first mold assembly comprising a first mold base and a first mold core disposed inside the first mold base, the first mold base and the first mold core being adapted to the shell structure of a first half-volute housing; a second mold assembly comprising a second mold base and a second mold core disposed inside the second mold base, the second mold base and the second mold core being adapted to the shell structure of a second half-volute housing; the first mold core and the second mold core, when molded together, form the cavity of the volute housing; characterized in that it further includes a core-pulling structure, which is respectively disposed within the first mold assembly and the second mold assembly. The core-pulling structure includes multiple core-pulling sliders adapted to the volute housing, which are used to pull out from the cavity during mold opening to form the internal structure of the volute housing; a positioning structure, which is disposed between the first mold assembly and the second mold assembly, is used to accurately position the first mold assembly and the second mold assembly during mold closing to ensure the dimensional accuracy of the cavity; a cooling structure, which is disposed within the first mold assembly and the second mold assembly, includes cooling channels that surround the cavity to cool the mold during manufacturing and accelerate the volute housing forming speed; the volute housing adopts the aforementioned variable flow multi-condition automotive water pump volute housing.

[0040] Furthermore, both the first mold core and the second mold core are provided with a release coating, which is a titanium nitride or molybdenum disulfide coating.

[0041] Furthermore, limit blocks are provided on both the first mold base and the second mold base. The limit blocks are used to limit the travel of the core-pulling slider to ensure that the core-pulling slider accurately reaches the working position and the extraction position.

[0042] The aforementioned mold is compatible with the split pump housing, effectively reducing subsequent maintenance costs and extending the service life of the automotive water pump.

Claims

1. A volute for a variable flow rate, multi-condition automotive water pump, comprising a first half-volute (1) and a second half-volute (2), wherein the first half-volute (1) and the second half-volute (2) are connected and assembled into a volute by a connector; characterized in that: The first half-volute (1) includes a first inlet pipe (11), a volute inlet section (12), a volute outlet transition section (13), a volute outlet pipe (14), and a pressurized jet structure (15); the second half-volute (2) includes a second inlet pipe (21) and a volute flow passage (22); the volute inlet section (12), the volute flow passage (22), and the volute outlet transition section (13) are connected in sequence to form a rotary pressurized flow path, wherein the outlines of the volute inlet section (12) and the volute outlet transition section (13) are arc-shaped, and the outline of the volute flow passage (22) is hyperbolic, with the central angle of the volute flow passage (22) being A, where 120° < A < 180°; the inner diameter of the first inlet pipe (11) is not equal to the inner diameter of the second inlet pipe (21); one end of the pressurized jet structure (15) is connected to the volute inlet section (12), and the other end is connected to... The volute outlet pipe (14) is connected, and the pressurized jet structure (15) includes an inner guide surface (151) near the tongue, an outer jet surface (152) away from the tongue, and an insert (153) that automatically adjusts the flow area. The insert (153) is located in the outlet flow channel of the pressurized jet structure (15). The inner guide surface (151) and the outer jet surface (152) are tangentially connected to the volute outlet pipe (14). A buffer arc surface (1521) is provided at the connection between the outer jet surface (152) and the volute inlet section (12). The inner diameter of the first inlet pipe (11) is D1, and the inner diameter of the second inlet pipe (21) is D2, where D1 > D2. A pressure sensor is provided on the surface of the insert (153) and connected to the controller circuit to control the opening and closing angle of the insert (153). The flow channel of the pressurized jet structure (15) is a tapered structure along the flow direction.

2. The volute housing for a variable flow, multi-condition automotive water pump as described in claim 1, characterized in that, A pressure plate (1511) is provided on the inlet side of the inner drainage surface (151) at a position corresponding to the buffer arc surface (1521). The pressure plate (1511) is a flat plate structure.

3. The volute housing for a variable flow, multi-condition automotive water pump as described in claim 2, characterized in that, The angle between the pressure plate (1511) and the inner drainage surface (151) is 10° to 30°.

4. The volute housing for a variable flow rate, multi-condition automotive water pump as described in claim 1, characterized in that, In the radial direction, the inlet end of the inner flow surface (151) is closer to the center of the volute than the inlet end of the outer jet surface (152).

5. A mold for a volute housing of a variable flow rate multi-condition automotive water pump, wherein the volute housing adopts the variable flow rate multi-condition automotive water pump volute housing according to any one of claims 1 to 4, comprising: A first mold assembly includes a first mold base and a first mold core disposed inside the first mold base, the first mold base and the first mold core being adapted to the shell structure of a first semi-volute; a second mold assembly includes a second mold base and a second mold core disposed inside the second mold base, the second mold base and the second mold core being adapted to the shell structure of a second semi-volute; the first mold core and the second mold core are molded together to form the cavity of the volute; characterized in that it further includes a core-pulling structure, which is respectively disposed within the first mold assembly and the second mold assembly. The core-pulling structure includes multiple core-pulling sliders adapted to the volute, which are used to pull out from the cavity during mold opening to form the internal structure of the volute; a positioning structure, which is disposed between the first mold assembly and the second mold assembly, is used to accurately position the first mold assembly and the second mold assembly during mold closing to ensure the dimensional accuracy of the cavity; and a cooling structure, which is disposed within the first mold assembly and the second mold assembly, includes cooling channels that surround the cavity to cool the mold during manufacturing and accelerate the volute molding speed.

6. The mold for a volute housing of a variable flow multi-condition automotive water pump as described in claim 5, characterized in that, Both the first mold core and the second mold core are provided with a release coating, which is a titanium nitride or molybdenum disulfide coating.

7. The mold for a volute housing of a variable flow multi-condition automotive water pump as described in claim 5, wherein both the first mold base and the second mold base are provided with limiting blocks, the limiting blocks being used to limit the travel of the core-pulling slider to ensure that the core-pulling slider accurately reaches the working position and the extraction position.

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