CN216111302U

CN216111302U - Pump for conveying heated fluid

Info

Publication number: CN216111302U
Application number: CN202121917675.4U
Authority: CN
Inventors: 王昱坤; 陆进; 李良东
Original assignee: BSH Electrical Appliances Jiangsu Co Ltd; BSH Hausgeraete GmbH
Current assignee: BSH Electrical Appliances Jiangsu Co Ltd; BSH Hausgeraete GmbH
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-03-22
Anticipated expiration: 2031-08-16
Also published as: EP4137701A1

Abstract

The utility model discloses a pump capable of conveying heated fluid, which comprises a driving part, an impeller part and a cover part, wherein the driving part, the impeller part and the cover part are sequentially connected, the cover part is provided with a fluid inlet and a fluid outlet, the driving part is provided with a first shell, the impeller part is provided with an impeller and a second shell, the first shell, the second shell and the cover part are sequentially and fixedly connected to define an impeller cavity for mounting the impeller, and the second shell and the impeller are respectively made of materials with the same or similar thermal expansion coefficients. The second housing then approximates the dimensional change of the impeller after thermal expansion, thus reducing the risk of stalling or excessive friction.

Description

Pump for conveying heated fluid

[ technical field ] A method for producing a semiconductor device

The present invention relates to pumps, and more particularly to pumps that can deliver heated fluids.

[ background of the utility model ]

The pump generally includes an impeller disposed within an impeller chamber. When the impeller works, the impeller is driven by the motor to rotate at a high speed to drive fluid to flow. In order to make the impeller have better fluid carrying effect, the impeller cavity can be made as small as possible, and a very small gap is formed between the impeller and the wall of the impeller cavity.

The impeller of the pump is usually made of plastic. The housing parts of the pump, including the walls of the impeller chamber, are sometimes made of metal, making them relatively strong and heat resistant. When such a pump is used to deliver heated fluid, especially when the fluid temperature is high, for example above 50 degrees celsius, the impeller has a large coefficient of thermal expansion due to the different coefficients of thermal expansion of the impeller made of plastic and the wall of the impeller cavity made of metal, and therefore the size becomes large to a large extent, and the gap between the impeller and the wall of the impeller cavity is compressed, thereby causing stalling or excessive wear of the impeller.

[ Utility model ] content

It is an object of the present invention to provide an improved pump which ameliorates the disadvantages of the prior art.

The embodiment of the utility model comprises the following steps: the utility model provides a can carry pump of fluid through heating, contains drive division, impeller portion that connects gradually to and the lid, be equipped with fluid inlet and fluid outlet on the lid, the drive division has first casing, impeller portion has impeller and second casing, and first casing, second casing, lid fixed connection in proper order inject the impeller cavity of installation impeller, the second casing with the impeller is made with the same or similar material of coefficient of thermal expansion respectively.

In some embodiments, the second housing and the impeller are both made of plastic.

In some embodiments, the second housing is made of the same material as the impeller.

An advantageous development further comprises that the second housing is situated radially outside the impeller, extending axially.

The advantageous development further comprises that the second housing comprises a first flange and a second flange at both axial ends and a cylindrical circumferential wall between the first flange and the second flange, the first flange and the second flange being fixedly connected to the first housing and the cover, respectively.

An advantageous development further comprises that the first housing and the cover are each made of metal.

An advantageous refinement further comprises that the axial depth of the impeller cavity is slightly greater than the axial thickness of the impeller, and that the difference in size between the two is less than 1 mm.

In various embodiments of the present invention, the second housing approximates the dimensional change of the impeller after thermal expansion, thereby reducing the risk of stalling or excessive friction.

Hereinafter, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

[ description of the drawings ]

FIG. 1 is an exploded view of a pump;

fig. 2 is a partial cross-sectional view of the pump.

[ detailed description ] embodiments

The pump 100 shown in fig. 1 may be used to deliver heated fluids, such as heated water and/or air. Wherein the temperature of the heating exceeds 40 degrees, for example. Such a pump 100 may be used in washing products such as washing machines, dishwashers, and the like. It is often desirable to heat the water in the wash product to facilitate soil removal. In some laundry products, it may even be desirable to pump at least part of the air through pump 100.

As shown in fig. 1 and 2, the pump 100 includes a drive unit 10, an impeller unit 20, and a cover unit 30 connected in this order. The driving part 10 includes a first housing 11 and a motor (not shown) located inside the first housing 11. The impeller portion 20 includes a second housing 21 and an impeller 22 located within the second housing 21. The cover 30 is provided with a fluid inlet 31 and a fluid outlet 32. The first housing 11, the second housing 21 and the cover 30 are fixedly connected in sequence to define an impeller cavity 23 for mounting the impeller 22. Wherein the first housing 11 and the cover 30 define axial ends of the impeller cavity 23, respectively, and the second housing 21 defines a circumferential boundary of the impeller cavity 23. The fluid inlet 31 and the fluid outlet 32 are respectively in spatial communication with the impeller chamber 23.

The second casing 21 is located radially outside the impeller 22 and extends axially. Specifically, the second housing 21 includes a first flange 24, a second flange 25 at both ends in the axial direction, and a cylindrical peripheral wall 26 between the first flange 24 and the second flange 25. The first flange 24 is fixedly connected to the first housing 11. The second flange 25 is fixedly connected to the cover 30.

As shown in fig. 2, the axial depth of the impeller cavity 23 is slightly greater than the axial thickness of the impeller 22, so that there is a gap 4 between the impeller 22 and the end of the impeller cavity 23. The difference in size between the axial depth of the impeller cavity 23 and the axial thickness of the impeller 22 is less than 1 mm. The sum of the dimensions of the gap 4 between the impeller 22 and the end of the impeller cavity 23 is therefore less than 1 mm. Due to such a small clearance, the impeller 22 is easily contacted with the inner wall of the impeller cavity 23 after being thermally expanded, and strong friction or even stalling occurs.

Therefore, the second casing 21 and the impeller 22 are made of materials having the same or similar thermal expansion coefficients, respectively. Since the impeller 22 is typically made of plastic, the second housing 21 is also made of plastic. It is also possible to make the second housing 21 and the impeller 22 of the same material. The material is selected to meet the requirements of the parameters associated with the second housing 21 and the impeller 22. Thus, a uniform thermal expansion coefficient can be ensured. The second housing 21 extends mainly in the axial direction, and the axial length thereof is extended after thermal expansion. The axial length of the second housing 21 is relatively close to the axial thickness of the impeller 22, and therefore the changing dimension is also close, so that the gap between the impeller 22 and the end of the impeller cavity 23 is kept relatively stable, and the impeller 22 is not easy to block or excessively rub.

In order to maintain the overall strength and the heat deformation resistance of the pump 100, the first casing 11 and the cover 30 may be made of metal, respectively.

The various embodiments described above and shown in the drawings are illustrative of the utility model and are not exhaustive of the utility model. Any modification of the present invention by a person of ordinary skill in the related art within the scope of the basic technical idea of the present invention is within the scope of the present invention.

Claims

1. A pump capable of conveying heated fluid, which comprises a driving part (10), an impeller part (20) and a cover part (30) which are connected in sequence, wherein a fluid inlet (31) and a fluid outlet (32) are arranged on the cover part, the driving part is provided with a first shell (11), the impeller part is provided with an impeller (22) and a second shell (21), the first shell, the second shell and the cover part are fixedly connected in sequence to define an impeller cavity () for installing the impeller, and the pump is characterized in that: the second shell and the impeller are made of materials with the same or similar thermal expansion coefficients respectively.

2. The pump of claim 1, wherein: the second housing and the impeller are both made of plastic.

3. The pump of claim 1, wherein: the second housing is made of the same material as the impeller.

4. The pump of claim 1, wherein: the second housing is located radially outward of the impeller and extends axially.

5. The pump of claim 4, wherein: the second housing comprises a first flange (24) and a second flange (25) which are positioned at two ends in the axial direction, and a cylindrical peripheral wall (26) which is positioned between the first flange and the second flange, and the first flange and the second flange are fixedly connected with the first housing and the cover part respectively.

6. The pump of claim 1, wherein: the first housing and the cover are made of metal, respectively.

7. The pump of claim 1, wherein: the axial depth of the impeller cavity is slightly larger than the axial thickness of the impeller, and the size difference between the impeller cavity and the impeller cavity is smaller than 1 mm.