Water pump cavity structure and electronic water pump using same

Abstract

The invention discloses a water pump cavity structure and an electronic water pump applying the same, and relates to the technical field of electronic water pumps and parts thereof. A rotor cavity is formed in the inner side of the pump shell; the pump cover covers the pump shell, and an impeller cavity of the pump cover and a rotor cavity of the pump shell are isolated from each other through an isolation plate. The liquid medium can enter the impeller chamber of the pump cover but cannot enter the rotor chamber of the pump housing. The centrifugal water pump mainly solves the problem of how to reduce the liquid suction resistance of the centrifugal water pump. The liquid suction resistance of the electronic water pump is effectively reduced, the water pump cavity structure can obtain enough negative pressure only by filling the impeller cavity of the pump cover with a liquid medium, so that normal operation of the electronic water pump is maintained, the electronic water pump can be normally used without filling water or completely pumping air in the rotor cavity, and the service life of the electronic water pump is prolonged. The performance, the stability and the service life of the electronic water pump are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic water pumps and their components, and particularly to a water pump chamber structure and an electronic water pump using the same. Background Art

[0002] Electronic water pumps have high output efficiency and can achieve precise flow control. Therefore, electronic water pumps are widely used in household appliances, automobiles, and industrial equipment. For example, household appliances such as water-warming mattresses, air conditioners, and humidifying appliances are increasingly equipped with electronic water pumps in order to achieve precise quantitative liquid circulation / discharge functions.

[0003] The centrifugal water pump is an important type of electronic water pump. It drives the liquid medium to rotate by a rotating impeller and causes a centrifugal phenomenon, thereby driving the liquid medium to flow in a specific direction.

[0004] The centrifugal water pumps in the prior art lack a self-priming function. When the centrifugal water pump is inverted, air will remain in its outlet pipe and pump chamber (including the impeller chamber and the rotor chamber that are interconnected). If the outlet pipe and the pump chamber are not filled with water, or the air in the outlet pipe and the pump chamber is not evacuated, the vacuum degree in the pump chamber will be insufficient, making it difficult for the centrifugal water pump to absorb water.

[0005] The common solution to the above problems is to continue filling water or evacuating the air in the pump chamber. However, the above operations require certain professional training or special equipment, which is difficult for some users to achieve.

[0006] In summary, how to reduce the liquid suction resistance of the centrifugal water pump has become one of the problems to be solved urgently. Summary of the Invention

[0007] The purpose of the present invention is to provide a water pump chamber structure and an electronic water pump using the same, which can effectively reduce the liquid suction resistance of the electronic water pump.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A water pump chamber structure, which includes:

[0009] A pump cover, with an impeller chamber formed inside it;

[0010] And a pump housing, with a rotor chamber formed inside it;

[0011] The pump cover is closed on the pump housing, and the impeller chamber of the pump cover and the rotor chamber of the pump housing are isolated from each other by a partition plate;

[0012] The liquid medium can enter the impeller chamber of the pump cover, but cannot enter the rotor chamber of the pump housing.

[0013] In the above technical solution, a sealing ring is provided between the pump cover and the pump housing; and / or, a sealing ring is provided between the pump housing and the partition plate; and / or, a sealing ring is provided between the pump cover and the partition plate.

[0014] In the above technical solution, a water inlet passage and a water outlet passage communicating with the inner and outer sides of the impeller chamber are respectively formed on the pump cover.

[0015] An electronic water pump includes the above water pump chamber structure.

[0016] In the above technical solution, the electronic water pump of the present invention further includes a rotor-impeller assembly and a stator assembly; the rotor-impeller assembly is sequentially configured with a rotor assembly and an impeller having a driving connection structure along its axial direction; the rotor assembly of the rotor-impeller assembly is rotatably disposed in the rotor chamber of the pump housing; the impeller of the rotor-impeller assembly is rotatably disposed in the impeller chamber of the pump cover; the stator assembly is disposed in the pump housing and outside the rotor chamber of the pump housing, so that the stator assembly can magnetically couple and drive the rotor assembly of the rotor-impeller assembly to rotate.

[0017] In the above technical solution, the rotor-impeller assembly further includes a rotating shaft; the rotating shaft of the rotor-impeller assembly penetrates through the rotor chamber of the pump housing and the impeller chamber of the pump cover, and the rotating shaft of the rotor-impeller assembly can rotate about its own axis; the rotor assembly of the rotor-impeller assembly is sleeved on the rotating shaft and is located in the rotor chamber of the pump housing; the impeller of the rotor-impeller assembly is sleeved on the rotating shaft and is located in the impeller chamber of the pump cover.

[0018] In the above technical solution, a first bearing is embedded in the rotor chamber of the pump housing; a second bearing is embedded in the partition plate; at least a part of the rotating shaft of the rotor-impeller assembly is supported by the first bearing, and at least another part of it is supported by the second bearing.

[0019] In the above technical solution, a water inlet passage and a water outlet passage communicating with the inner and outer sides of the impeller chamber are respectively formed on the pump cover; the impeller of the rotor-impeller assembly is sequentially configured with a main driving part and a water inlet driving part along its axial direction; the main driving part of the impeller is located in the impeller chamber of the pump cover; the water inlet driving part of the impeller penetrates into the water inlet passage of the pump cover.

[0020] In the above technical solution, a water inlet notch is provided at the water inlet passage of the pump cover.

[0021] In the above technical solution, the electric water pump of the present invention further includes a drive circuit board; the drive circuit board is disposed in the pump housing and is electrically connected to the stator assembly.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: For the water pump chamber structure of the present invention and the electric water pump applying the same, under the barrier of the partition plate, the liquid medium can only enter the impeller chamber of the pump cover, but cannot enter the rotor chamber of the pump housing. Therefore, the air in the rotor chamber of the pump housing does not participate in the negative pressure construction process of the water pump chamber structure, effectively reducing the liquid suction resistance of the electric water pump. That is, the liquid medium only needs to fill the impeller chamber of the pump cover to enable the water pump chamber structure to obtain sufficient negative pressure, thereby maintaining the normal operation of the electric water pump. The electric water pump of the present invention can be used normally without filling water or exhausting the air in the rotor chamber, improving the performance, stability and service life of the electric water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural view of the present invention.

[0024] Figure 2 is an exploded structural view of the present invention.

[0025] Figure 3 is a sectional structural view of the present invention.

[0026] The reference numerals are: 1, pump cover; 11, impeller chamber; 12, water inlet channel; 121, water inlet notch; 13, water outlet channel; 2, pump housing; 21, rotor chamber; 22, water outlet pipe; 23, first bearing; 3, partition plate; 31, second bearing; 4, sealing ring; 5, rotor-impeller assembly; 51, rotating shaft; 52, rotor assembly; 53, impeller; 531, main drive part; 532, water inlet drive part; 6, stator assembly; 7, drive circuit board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] This embodiment provides a water pump chamber structure that can be applied to a water pump (especially an inverted drainage pump based on a centrifugal electric water pump) and is used as the rotor chamber structure and impeller chamber structure of the water pump.

[0029] Please refer to Figures 1 - 3 , the water pump chamber structure of this embodiment includes:

[0030] A pump cover 1, with an impeller chamber 11 formed inside it;

[0031] And a pump housing 2, with a rotor chamber 21 formed inside it.

[0032] Among them, the pump cover 1 is a one-piece formed cover-like member made of engineering plastic or metal material, and the impeller chamber 11 is a cavity inside the pump cover 1; the pump housing 2 is a one-piece formed semi-housing member made of engineering plastic material, and the rotor chamber 21 is a cavity inside the pump housing 2.

[0033] The pump cover 1 is covered on the pump housing 2. It can be understood that the pump cover 1 and the pump housing 2 can be fixedly combined into one body by means of screws or snap fasteners, etc.

[0034] And, the impeller chamber 11 of the pump cover 1 and the rotor chamber 21 of the pump housing 2 are isolated from each other by a partition plate 3; it should be noted that, in this embodiment, the partition plate 3 is an independent plate-like member made of engineering plastic or metal material, which is covered on the opening side of the rotor chamber 21 of the pump housing 2, and is in interference fit or snap fit with the opening side of the rotor chamber 21 of the pump housing 2 to isolate the impeller chamber 11 of the pump cover 1 and the rotor chamber 21 of the pump housing 2 from each other; in other embodiments, the partition plate 3 is a plate-like structural feature integrally formed on the opening side of the rotor chamber 21 of the pump housing 2.

[0035] (Under the block of the partition plate 3) The liquid medium can enter the impeller chamber 11 of the pump cover 1, but cannot enter the rotor chamber 21 of the pump housing 2.

[0036] Furthermore, a sealing ring is provided between the pump cover 1 and the pump housing 2; and / or, a sealing ring is provided between the pump housing 2 and the partition plate 3; and / or, a sealing ring is provided between the pump cover 1 and the partition plate 3; in this embodiment, the water pump chamber structure is configured with a sealing ring 4 (specifically made of rubber or silica gel material), the upper and lower sides of the sealing ring 4 are respectively abutted against the pump cover 1 and the pump housing 2, and the inner side of the sealing ring 4 is abutted against the partition plate 3. In this way, that is, through a single sealing ring 4, the sealing between the pump cover 1, the pump housing 2 and the partition plate 3 is realized simultaneously.

[0037] Furthermore, a water inlet channel 12 and a water outlet channel 13 communicating the inside and outside of the impeller chamber 11 are respectively formed on the pump cover 1. In this embodiment, the water inlet channel 12 is a rigid short pipe integrally formed at the pump cover 1, and the water outlet channel 13 is a cavity-shaped flow channel integrally formed in the pump cover 1. And, an outlet pipe 22 is integrally formed at the pump housing 2 (the outlet pipe 22 is specifically an axial tubular structural feature integrally formed on the outer wall of the pump housing 2). When the pump cover 1 is covered on the pump housing 2, the water outlet channel 13 at the pump cover 1 is communicated with the outlet pipe 22 at the pump housing 2. In this way, the function of water inlet and outlet of the impeller chamber 11 is realized.

[0038] This embodiment also provides an electric water pump, which includes the above-mentioned water pump chamber structure.

[0039] Please refer to Figures 1 - 3 , the electric water pump of this embodiment further includes a rotor-impeller assembly 5 and a stator assembly 6.

[0040] Among them, the stator assembly 6 at least includes a stator bracket (also known as "stator core"), and an enameled wire coil wound around the stator bracket, which can generate a rotating magnetic field during operation to drive the rotor-impeller assembly 5 to rotate.

[0041] The rotor-impeller assembly 5 is configured with a rotor assembly 52 and an impeller 53 having a transmission connection structure in sequence along its axial direction.

[0042] Among them, the rotor assembly 52 at least includes a rotor bracket, and a magnetic ring or several magnetic pieces (both the magnetic ring and the magnetic pieces have permanent magnetism) embedded in the rotor bracket. After receiving the rotating magnetic field, the rotor assembly 52 can rotate around its own axis, and the rotor bracket has a shaft hole.

[0043] Among them, the impeller 53 is a shaft-shaped member made of engineering plastic with several radially extending blades, and the impeller 53 has a shaft hole.

[0044] The rotor assembly 52 of the rotor-impeller assembly 5 is rotatably disposed in the rotor chamber 21 of the pump housing 2.

[0045] The impeller 53 of the rotor-impeller assembly 5 is rotatably disposed in the impeller chamber 11 of the pump cover 1.

[0046] The stator assembly 6 is disposed in the pump housing 2 and outside the rotor chamber 21 of the pump housing 2, so that the stator assembly 6 can magnetically couple and drive the rotor assembly 52 of the rotor-impeller assembly 5 to rotate; in this embodiment, the stator assembly 6 is sleeved outside the rotor chamber 21 of the pump housing 2, and it can be fixed in the pump housing 2 by snap-fastening or screw-threading.

[0047] Specifically, the rotor-impeller assembly 5 further includes a rotating shaft 51. Among them, the rotating shaft 51 is a shaft-shaped member made of metal; the rotating shaft 51 of the rotor-impeller assembly 5 penetrates through the rotor chamber 21 of the pump housing 2 and the impeller chamber 11 of the pump cover 1, and the rotating shaft 51 of the rotor-impeller assembly 5 can rotate around its own axis; the rotor assembly 52 of the rotor-impeller assembly 5 is sleeved on the rotating shaft 51 (with interference fit or key fit) and is located in the rotor chamber 21 of the pump housing 2; the impeller 53 of the rotor-impeller assembly 5 is sleeved on the rotating shaft 51 (with interference fit or key fit) and is located in the impeller chamber 11 of the pump cover 1.

[0048] More specifically, a first bearing 23 is embedded in the rotor chamber 21 of the pump housing 2. The first bearing 23 is one of a ceramic bearing, a graphite bearing, or a self-lubricating bushing; a second bearing 31 is embedded in the partition plate 3. The second bearing 31 is one of a ceramic bearing, a graphite bearing, or a self-lubricating bushing; the rotating shaft 51 of the rotor-impeller assembly 5 is at least partially supported by the first bearing 23 and at least another part is supported by the second bearing 31. In fact, the rotating shaft 51 of the rotor-impeller assembly 5 directly penetrates into the inner rings of the first bearing 23 and the second bearing 31.

[0049] After being configured in the above manner, the rotating shaft 51, the rotor assembly 52, and the impeller 53 constitute a coaxial rotating body assembly, that is, the rotor-impeller assembly 5.

[0050] Further, in order to improve the self-priming ability of the electric water pump, the impeller 53 of the rotor-impeller assembly 5 is sequentially provided with a main driving part 531 and a water inlet driving part 532 along its axial direction. Specifically, the blades at the main driving part 531 extend a longer distance in the radial direction, and the blades at the water inlet driving part 532 extend a shorter distance in the radial direction. Moreover, the blades at the main driving part 531 and the blades at the water inlet driving part 532 are connected axially; the main driving part 531 of the impeller 53 is located in the impeller chamber 11 of the pump cover 1; the water inlet driving part 532 of the impeller 53 penetrates into the water inlet passage 12 of the pump cover 1.

[0051] Further, in order to improve the self-priming ability of the electric water pump, a water inlet notch 121 is formed at the water inlet passage 12 of the pump cover 1. In fact, the water inlet notch 121 is a notch-shaped structural feature integrally formed on the side of the water inlet passage 12 of the pump cover 1.

[0052] Further, the electric water pump of this embodiment further includes a drive circuit board 7. The drive circuit board 7 is a printed circuit board (PCB), which is equipped with a main control, power electronic devices for driving the stator assembly 6 to operate, and necessary peripheral circuits for driving the stator assembly 6 to operate; the drive circuit board 7 is arranged in the pump housing 2 and is electrically connected to the stator assembly 6. In fact, the drive circuit board 7 can be fixed in the pump housing 2 by means of snap-fastening or screw-threading. In some possible embodiments, terminals are provided at the ends of the enameled wire coils of the stator assembly 6, and the terminals are welded to the drive circuit board 7 to achieve the electrical connection between the stator assembly 6 and the drive circuit board 7.

[0053] When the electric water pump of this embodiment is in use, an external power source is connected to the drive circuit board 7, and the drive circuit board 7 supplies power to the enameled wire coil of the stator assembly 6. After the enameled wire coil is powered on, an alternating magnetic field can be generated. After being guided by the stator bracket (stator core), a rotating magnetic field can be generated in the rotor chamber 21. This rotating magnetic field is located in the rotor chamber 21 in space. The rotor assembly 52 (specifically its magnetic ring / magnetic sheet) in the rotor chamber 21 is magnetically coupled with this rotating magnetic field, causing the entire rotor-impeller assembly 5 to start rotating. The impeller 53 located in the impeller chamber 11 can generate a directional pressure difference in the impeller chamber 11 when rotating, thereby driving the liquid medium to be sucked into the impeller chamber 11 from the water inlet channel 12 and discharged along the water outlet channel 13 and the water outlet pipe 22 of the pump housing 2, thus completing the basic function of the water pump.

[0054] During the above process, both the main drive part 531 and the water inlet drive part 532 of the impeller 53 are rotating. The rotating water inlet drive part 532 can suck the liquid medium at the water inlet channel 12 into the impeller chamber 11, and then form a stable water flow under the drive of the main drive part 531. Even if the liquid level is relatively shallow, as long as the liquid level can contact the water inlet drive part 532, the water pump can operate normally without initial water supply. An inlet notch 121 is provided at the water inlet channel 12 of the pump cover 1, which is conducive to the liquid medium entering the water inlet channel 12 and contacting the water inlet drive part 532 of the impeller 53. Therefore, there is a matching effect between the inlet notch 121 of the pump cover 1 and the water inlet drive part 532 of the impeller 53.

[0055] Please refer especially to Figure 3 During the above process, under the blockage of the isolation plate 3, the liquid medium can only enter the impeller chamber 11 of the pump cover 1, but cannot enter the rotor chamber 21 of the pump housing 2. Therefore, the air in the rotor chamber 21 of the pump housing 2 does not participate in the negative pressure construction process of the water pump chamber structure, effectively reducing the liquid suction resistance of the electric water pump. That is, the liquid medium only needs to fill the impeller chamber 11 of the pump cover 1 to enable the water pump chamber structure to obtain sufficient negative pressure, thereby maintaining the normal operation of the electric water pump. Without filling water or evacuating the air in the rotor chamber 21, the electric water pump of this embodiment can be used normally, improving the performance, stability and service life of the electric water pump.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water pump chamber structure, characterized in that: include: a pump cover, an impeller chamber being formed on an inner side thereof; and, a pump housing having a rotor chamber formed inside thereof; The pump cover is covered on the pump housing, and the impeller chamber of the pump cover and the rotor chamber of the pump housing are isolated from each other by an isolation plate; Liquid medium can enter the impeller chamber of the pump cover, but cannot enter the rotor chamber of the pump housing.

2. The water pump chamber structure according to claim 1, characterized in that: A sealing ring is provided between the pump cover and the pump housing; And / or, a sealing ring is provided between the pump housing and the isolation plate; And / or, a sealing ring is provided between the pump cover and the isolation plate.

3. The water pump chamber structure according to claim 1 or 2, characterized in that: The pump cover is respectively formed with a water inlet channel and a water outlet channel communicating with both sides inside and outside of the impeller chamber.

4. An electronic water pump, characterized in that: It comprises the water pump chamber structure described in any one of claims 1-3.

5. The electronic water pump according to claim 4, characterized in that: Also included is a rotor-impeller assembly and a stator assembly; The rotor-impeller assembly is sequentially configured along its axial direction as a rotor assembly and an impeller having a transmission connection structure; The rotor assembly of the rotor-impeller assembly is rotatably disposed in the rotor chamber of the pump housing; The impeller of the rotor-impeller assembly is rotatably disposed in the impeller chamber of the pump cover; The stator assembly is configured in the pump housing and is located outside the rotor chamber of the pump housing, so that the stator assembly can be magnetically coupled to drive the rotor assembly of the rotor-impeller assembly to rotate.

6. The electronic water pump according to claim 5, characterized in that: The rotor-impeller assembly also includes a rotating shaft; The rotating shaft of the rotor-impeller assembly passes through the rotor chamber of the pump housing and the impeller chamber of the pump cover, and the rotating shaft of the rotor-impeller assembly can rotate with itself as the axis; The rotor assembly of the rotor-impeller assembly is sleeved on the rotating shaft and is located in the rotor chamber of the pump housing; The impeller of the rotor-impeller assembly is sleeved on the rotating shaft and is located in the impeller chamber of the pump cover.

7. The electronic water pump according to claim 6, characterized in that: A first bearing is embedded in the rotor chamber of the pump housing; A second bearing is embedded in the isolation plate; At least a portion of the rotating shaft of the rotor-impeller assembly is supported by the first bearing, and at least another portion of the rotating shaft is supported by the second bearing.

8. The electronic water pump according to any one of claims 5 to 7, characterized in that: The pump cover is respectively formed with a water inlet channel and a water outlet channel communicating with both sides of the impeller chamber inside and outside; The impeller of the rotor-impeller assembly is sequentially configured as a main drive part and a water inlet drive part along its axial direction; The main driving part of the impeller is located in the impeller chamber of the pump cover; The water inlet driving part of the impeller penetrates into the water inlet channel of the pump cover.

9. The electronic water pump according to claim 8, characterized in that: A water inlet notch is provided at the water inlet channel of the pump cover.

10. The electronic water pump according to any one of claims 5 to 7, characterized in that: Also includes a driver circuit board; The driving circuit board is arranged in the pump housing and is electrically connected to the stator assembly.

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