Liquid cavity assembly suitable for liquid adding pump

Abstract

The utility model relates to the technical field of drainage equipment, in particular to a liquid cavity assembly suitable for a liquid adding pump, which comprises a pump shell, a liquid inlet pipe, a liquid outlet pipe and a liquid outlet pipe, the liquid storage pipe is suitable for sucking in and pumping out liquid through telescopic deformation; the pull rod comprises a connecting part used for being connected with the liquid storage pipe to push and pull the liquid storage pipe; the connecting part is suitable for being in sliding fit with the containing cavity, and the wall face, making contact with the containing cavity, of the connecting part is an outwards-protruding arc-shaped face. According to the utility model, the problem that the pump flow precision is reduced due to the fact that a gap exists between the pull rod and the cavity wall of the accommodating cavity when the pull rod pulls the liquid storage pipe can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage equipment, in particular to a liquid chamber component suitable for a liquid adding pump. Background Art

[0002] Liquid pumps are widely used in household appliances such as, but not limited to, dishwashers and washing machines. Liquid pumps generally include a cavity, a motor, a transmission system, etc. The cavity is used to pump and output liquid, the motor is used to generate power, and the transmission system is used to transmit the power generated by the motor to the cavity.

[0003] In this regard, for example, the patent with the announcement number CN 209733895 U proposes a liquid adding pump, in which a bellows and a pull rod 200 are used in combination in the liquid chamber, one end of the bellows is fixed to the pull rod and reciprocates with the pull rod, wherein, since one end of the pull rod 200 makes a circular motion, the bellows is deformed during the reciprocating motion. Furthermore, the reciprocating motion of the pull rod 200 causes the volume of the cavity to change, so as to realize the suction and output of the liquid from the liquid inlet and outlet, and in this process, the pull rod 200 both moves and rotates during the motion.

[0004] For more details on the above, see Figure 1 As shown, assuming that the diameter of the second half shell cavity 100 for accommodating the bellows and the tie rod 200 is d1, since the end of the tie rod 200 connected to the bellows is a columnar structure, and both sides of the axial section of the columnar structure are straight lines, under this structure, in order to make the boundary of the end of the tie rod 200 connected to the bellows not exceed the boundary of the second half shell cavity 100 when the tie rod 200 is tilted ( Figure 1 -A), then when the pull rod 200 is vertical, there must be a larger gap K between the end thereof connected to the bellows and the second half shell cavity 100 ( Figure 1 -B), the gap causes the end of the pull rod 200 connected to the bellows to be unstable in the position of the second half shell cavity 100, such as Figure 1 -C, the end of the pull rod 200 connected to the bellows may be close to the inner wall of the second half shell cavity 100 on one side, and there is a large gap on the other side, which will cause the bellows connected to the pull rod 200 to be significantly eccentric, ultimately resulting in poor pump flow accuracy.

[0005] Therefore, in view of the problem that the liquid pump assembly in the above technology may reduce the pump flow, it is necessary to optimize and improve the relevant structure. Utility Model Content

[0006] The utility model aims to provide a liquid chamber component suitable for a liquid filling pump, so as to solve the technical problem of reducing the pump flow accuracy due to a gap between a pulling rod and the cavity wall of the accommodating cavity during the process of pulling a liquid storage tube.

[0007] The liquid chamber component suitable for the liquid adding pump of the utility model is realized as follows:

[0008] A liquid chamber component suitable for a liquid adding pump, comprising:

[0009] A pump housing having a hollow receiving chamber;

[0010] A liquid storage tube, which is suitable for achieving liquid suction and pumping through telescopic deformation;

[0011] The pulling rod comprises a connecting part for connecting the liquid storage tube to realize pushing and pulling of the liquid storage tube; the connecting part is suitable for forming a sliding fit with the accommodating cavity, and the wall surface of the connecting part contacting the accommodating cavity is an outwardly convex arc surface.

[0012] In an optional embodiment of the present invention, the arcuate surface includes large arcuate surfaces evenly distributed on the circumferential side walls of the connecting portion.

[0013] In an optional embodiment of the present invention, the large arc surface extends to the two side edges of the circumferential side wall of the connecting portion so that the circumferential side wall of the connecting portion is an outwardly convex spherical surface as a whole.

[0014] In an optional embodiment of the present invention, the arcuate surface includes a plurality of small arcuate surfaces distributed at intervals on the circumferential side wall of the connecting portion; and the outer wall surfaces of the plurality of small arcuate surfaces are located on the same circumferential surface.

[0015] In an optional embodiment of the present invention, each of the small arc-shaped surfaces extends on the circumferential side wall of the connecting portion to its two side edges.

[0016] In an optional embodiment of the present invention, the cross-section of the accommodating cavity for matching the connecting portion is circular, and the corresponding cross-section of the connecting portion adapted to the connecting portion is circular; and

[0017] The arc surface is formed on the outer circular wall surface of the connecting portion.

[0018] In an optional embodiment of the present invention, the outer diameter of the arc-shaped surface on the connecting portion is 0.1 to 0.4 mm smaller than the inner diameter of the accommodating cavity.

[0019] In an optional embodiment of the present invention, the angle between the diagonal line of the axial section of the connecting portion and the end face of the connecting portion connected to the liquid storage tube is set to α2, and the maximum angle formed by the end face of the connecting portion connected to the liquid storage tube and the radial cross section of the accommodating cavity during the movement of the connecting portion in the accommodating cavity is α1; then

[0020] α2≥α1.

[0021] In an optional embodiment of the present utility model, the cross-section of the accommodating cavity for matching the connecting portion is rectangular, and the corresponding cross-section of the connecting portion adapted to the connecting portion is rectangular; and

[0022] The arc surface is formed on the outer side of the connecting portion.

[0023] In an optional embodiment of the present invention, the liquid storage tube is a corrugated tube.

[0024] By adopting the above technical scheme, the utility model has the following beneficial effects: the liquid chamber assembly suitable for the liquid adding pump of the utility model is provided with an arc surface on the wall surface where the connecting part connecting the pull rod and the liquid storage tube contacts the accommodating chamber, so that when the pull rod moves in the accommodating chamber, a sliding fit effect is formed between the connecting part and the cavity wall of the accommodating chamber. Under this structure, for the connecting part of the pull rod, on the basis of meeting the use requirement that it moves in the accommodating chamber and tilts relative to the accommodating chamber, it can also avoid the formation of a large gap between one of its side wall surfaces and the cavity wall of the accommodating chamber, thereby ensuring the stability of the position of the connecting part of the pull rod in the accommodating chamber, thereby avoiding the problem of poor pump flow accuracy caused by eccentricity of the liquid storage tube connected to the pull rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the movement process of the pull rod in the second half shell cavity in the prior art with the announcement number CN 209733895 U;

[0026] Figure 2 It is a schematic diagram of a first viewing angle of an arc surface of a pull rod of a liquid chamber assembly of a liquid adding pump according to the utility model in an implementation situation;

[0027] Figure 3 It is a schematic diagram of a second viewing angle of the arc surface of the pull rod of the liquid chamber assembly of the liquid adding pump of the utility model in one implementation;

[0028] Figure 4 It is a schematic diagram of the cooperation between the pull rod and the accommodating cavity of the liquid cavity assembly applicable to the liquid adding pump of the utility model;

[0029] Figure 5 It is a dimension diagram of a pull rod of a liquid chamber assembly suitable for a liquid adding pump of the utility model;

[0030] Figure 6 It is a structural schematic diagram of the connecting portion of the pull rod of the liquid chamber assembly of the liquid adding pump of the utility model in another implementation situation;

[0031] Figure 7 It is a schematic diagram of the connection part of the liquid chamber assembly of the liquid adding pump of the utility model when it moves to the upper limit position in the accommodating chamber;

[0032] Figure 8 It is a schematic diagram of the connection part of the liquid chamber assembly of the liquid adding pump of the utility model when it moves to the lower limit position in the accommodating chamber;

[0033] Fig. 9 It is a schematic diagram of the connecting portion of the liquid chamber assembly of the liquid adding pump of the utility model when it moves to the left limit position in the accommodating chamber;

[0034] Fig.10 It is a schematic diagram of the connecting portion of the liquid chamber assembly of the liquid adding pump of the utility model when it moves to the right limit position in the accommodating chamber;

[0035] Fig.11 It is a first perspective schematic diagram of the arc surface of the pull rod of the liquid chamber assembly of the liquid filling pump of the utility model in another implementation situation.

[0036] In the figure: pump housing 1, gap K, accommodating chamber 11, pulling rod 2, connecting part 21, large arc surface 22, small arc surface 23. DETAILED DESCRIPTION

[0037] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0038] Embodiment 1:

[0039] See also Figures 2 to 10 As shown, this embodiment provides a liquid chamber assembly suitable for a liquid filling pump, which generally comprises a pump housing 1 having a hollow accommodating chamber 11, a liquid storage tube suitable for realizing the suction and pumping of liquid through telescopic deformation, and a pulling rod 2 for connecting the liquid storage tube to realize the pushing and pulling of the liquid storage tube. The liquid storage tube can be optionally used, for example, but not limited to, a bellows.

[0040] Of course, it should be noted that the liquid filling pump involved here also includes a motor and a transmission system in the mature technology arranged in the pump housing 1. The motor and the transmission system here can be selected from the related technologies disclosed in the prior art, such as the patent with announcement number CN209733895 U, and this embodiment does not make an absolute limitation on this.

[0041] Based on the above structure, it should be noted that in order to meet the requirements of use with the liquid storage tube, the pull rod 2 is provided with a connecting portion 21 for connecting the liquid storage tube to achieve pushing and pulling of the liquid storage tube. The connecting portion 21 is built into the accommodating cavity 11 like the liquid storage tube.

[0042] In further detail, the connection portion 21 in this embodiment is adapted to form a sliding fit with the accommodating cavity 11 , and the wall surface of the connection portion 21 in contact with the accommodating cavity 11 is an outwardly convex arc surface. In a preferred embodiment, the arc surface is integrally formed on the connection portion 21 .

[0043] Regarding the specific structure of the arcuate surface, this embodiment uses an example with reference to the accompanying drawings, where the arcuate surface includes large arcuate surfaces 22 evenly distributed on the circumferential side wall of the connecting portion 21. Moreover, the large arcuate surfaces 22 extend to the two side edges of the circumferential side wall of the connecting portion 21 so that the circumferential side wall of the connecting portion 21 is an outwardly convex spherical surface as a whole. This structure is easy to process and has low processing difficulty.

[0044] In addition, it should be noted that, for the accommodation cavity 11 used in this embodiment:

[0045] In the first optional implementation, the cross section of the accommodating cavity 11 is circular for matching the connecting portion 21, and the corresponding connecting portion 21 is adapted to the cross section of the connecting portion 21 being circular; and the arc surface is formed on the outer circular wall surface of the connecting portion 21. Under this structure, the accommodating cavity 11 is more adapted to the shape of the corrugated tube, which can improve the internal space utilization of the accommodating cavity 11.

[0046] Based on the above structure, it should be noted that the outer diameter of the arc surface on the connecting portion 21 is 0.1-0.4 mm smaller than the inner diameter of the accommodating cavity 11. Based on this structure, the connecting portion 21 of the pull rod 2 can slide smoothly in the accommodating cavity 11 without causing obvious shaking of the connecting portion 21 in the accommodating cavity 11.

[0047] In addition, it is necessary to further explain that the angle between the diagonal line of the axial section of the connecting portion 21 and the end face of the connecting portion 21 connected to the liquid storage tube is set to α2, and the maximum angle formed by the end face of the connecting portion 21 connected to the liquid storage tube and the radial section of the accommodating chamber 11 during the movement of the connecting portion 21 in the accommodating chamber 11 is α1; then α2≥α1. Under this structure, during the periodic movement of the pull rod 2 in the accommodating chamber 11, the circumferential outer wall of the connecting portion 21 always maintains an equal gap with the cavity wall of the accommodating chamber 11, that is, the center point of the connecting portion 21 of the pull rod 2 will not produce a large swing in the accommodating chamber 11, thereby improving the stability of the pull rod 2 in the accommodating chamber 11, thereby improving the flow accuracy of the overall liquid filling pump.

[0048] In a second optional implementation, the accommodating cavity 11 used in this embodiment can also be rectangular in cross-section for matching the connecting portion 21, and the corresponding connecting portion 21 is adapted to have a rectangular cross-section; and an arc surface is formed on the outer side of the connecting portion 21.

[0049] In summary, for the liquid chamber assembly applicable to the liquid adding pump of this embodiment, refer to Figures 7 to 10 As shown, when the pull rod 2 moves relative to the accommodating chamber 11, the connecting portion 21 tilts. When the connecting portion 21 moves to the left limit position in the accommodating chamber 11 (see Fig. 9 ), there is no significant change in the gap between the circumferential outer wall of the connecting portion 21 and the cavity wall of the accommodating cavity 11; when the connecting portion 21 moves to the right limit position in the accommodating cavity 11 (see Fig.10 ), there is no significant change in the gap between the circumferential outer wall of the connecting portion 21 and the cavity wall of the accommodating cavity 11; when the connecting portion 21 moves to the upper limit position in the accommodating cavity 11 (see Figure 7 ), there is no significant change in the gap between the circumferential outer wall of the connecting portion 21 and the cavity wall of the accommodating cavity 11; when the connecting portion 21 moves to the lower limit position in the accommodating cavity 11 (see Figure 8 ), there is no significant change in the gap between the circumferential outer wall of the connecting portion 21 and the cavity wall of the accommodating cavity 11.

[0050] Therefore, by providing an arc surface on the wall surface where the connecting portion 21 connecting the pull rod 2 and the liquid storage tube contacts the accommodating chamber 11, a sliding fit effect is formed between the connecting portion 21 and the cavity wall of the accommodating chamber 11 during the movement of the pull rod 2 in the accommodating chamber 11. Under this structure, for the connecting portion 21 of the pull rod 2, while meeting the use requirements of its movement in the accommodating chamber 11 and tilting relative to the accommodating chamber 11, it can also avoid the connecting portion 21 from forming a large gap between one of its side walls and the cavity wall of the accommodating chamber 11, thereby ensuring the stability of the position of the connecting portion 21 of the pull rod 2 in the accommodating chamber 11, thereby avoiding the problem of poor pump flow accuracy caused by eccentricity of the liquid storage tube connected to the pull rod 2.

[0051] Embodiment 2:

[0052] See also Fig.11 As shown, based on the liquid chamber assembly applicable to the liquid adding pump of Example 1, the liquid chamber assembly applicable to the liquid adding pump provided in this embodiment has the same general structure as that of Example 1, except that the arc surface adopted in this embodiment includes a plurality of small arc surfaces 23 distributed at intervals on the circumferential side wall of the connecting portion 21; and the outer wall surfaces of the plurality of small arc surfaces 23 are located on the same circumferential surface. That is to say, in this embodiment, a plurality of small arc surfaces 23 are used to form the contact surface with the accommodating cavity 11. In the preferred implementation, the plurality of small arc surfaces 23 and the connecting portion 21 are formed in an integral structure.

[0053] It should be noted here that each small arc-shaped surface 23 extends on the circumferential side wall of the connecting portion 21 to two side edges thereof.

[0054] For the liquid chamber assembly suitable for the liquid filling pump of this embodiment, replacing the large arc surface 22 of embodiment 1 with a plurality of small arc surfaces 23 not only does not affect its use effect, but also can reduce the material cost in the production process of the pull rod 2.

[0055] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0056] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A liquid chamber assembly suitable for a liquid filling pump, characterized in that: include: A pump housing having a hollow receiving chamber; A liquid storage tube, which is suitable for achieving liquid suction and pumping through telescopic deformation; The pulling rod comprises a connecting part for connecting the liquid storage tube to realize pushing and pulling of the liquid storage tube; the connecting part is suitable for forming a sliding fit with the accommodating cavity, and the wall surface of the connecting part contacting the accommodating cavity is an outwardly convex arc surface.

2. The liquid chamber assembly suitable for a liquid filling pump according to claim 1, characterized in that: The arc-shaped surface includes large arc-shaped surfaces uniformly distributed on the circumferential side wall of the connecting portion.

3. The liquid chamber assembly suitable for a liquid filling pump according to claim 2, characterized in that: The large arc surface extends to two side edges of the circumferential side wall of the connecting portion so that the circumferential side wall of the connecting portion is an outwardly convex spherical surface as a whole.

4. The liquid chamber assembly suitable for a liquid filling pump according to claim 1, characterized in that: The arc-shaped surface includes a plurality of small arc-shaped surfaces which are distributed at intervals on the circumferential side wall of the connecting portion; and the outer wall surfaces of the plurality of small arc-shaped surfaces are located on the same circumferential surface.

5. The liquid chamber assembly suitable for a liquid filling pump according to claim 4, characterized in that: Each of the small arc-shaped surfaces extends on the circumferential side wall of the connecting portion to two side edges thereof.

6. The liquid chamber assembly suitable for a liquid filling pump according to any one of claims 1 to 5, characterized in that: The cross section of the accommodating cavity for matching the connecting portion is circular, and the corresponding connecting portion is adapted to the cross section of the connecting portion is circular; and The arc surface is formed on the outer circular wall surface of the connecting portion.

7. The liquid chamber assembly suitable for a liquid filling pump according to claim 6, characterized in that: The outer diameter of the arc-shaped surface on the connecting portion is 0.1 to 0.4 mm smaller than the inner diameter of the accommodating cavity.

8. The liquid chamber assembly suitable for a liquid filling pump according to claim 6, characterized in that: The angle between the diagonal line of the axial section of the connecting portion and the end face of the connecting portion connected to the liquid storage tube is set to α2, and the maximum angle formed by the end face of the connecting portion connected to the liquid storage tube and the radial section of the accommodating cavity during the movement of the connecting portion in the accommodating cavity is set to α1; then α2≥α1。 9. The liquid chamber assembly suitable for a liquid filling pump according to any one of claims 1 to 5, characterized in that: The cross section of the accommodating cavity is used to match the connecting portion, and the corresponding connecting portion is adapted to the connecting portion, which has a rectangular cross section; and The arc surface is formed on the outer side of the connecting portion.

10. The liquid chamber assembly suitable for a liquid filling pump according to any one of claims 1 to 5, characterized in that: The liquid storage tube adopts a corrugated tube.

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