Elastic member and pump assembly including the same
An elastic member for a pump assembly is provided. The elastic member may include an upper support; a lower support provided under the upper support; and a connection part which connects the upper support and the lower support, and in which peaks and valleys are repeatedly formed in an outward direction to be bent when the elastic member is pressurized.
1. An elastic member configured to be used in a pump assembly comprising a stem and a sealing part, the elastic member comprising:
a first support having a first side wall;
a second support having a second side wall; and
a connection part connecting the first support and the second support and comprising a plurality of peaks and a plurality of valleys alternatingly disposed, wherein inner diameters of the plurality of peaks are greater than inner diameters of the plurality of valleys,
wherein the elastic member has a through hole penetrating the first support, the connection part, and the second support along an axial direction of the elastic member, and a space is defined within the elastic member for accommodating the stem of the pump assembly,
wherein the first support extends one end of the connection part, and the first side wall of the first support accommodates the stem of the pump assembly to restrict a lateral movement of the elastic member,
wherein the second support extends another end of the connection part, and the second side wall of the second support is supported by the sealing part of the pump assembly to restrict the lateral movement of the elastic member,
wherein when the elastic member is compressed along the axial direction, the plurality of peaks and the plurality of valleys are bent to assist a pump action of the pump assembly,
wherein one of the first side wall and the second side wall has a multi-step structure, and
wherein the elastic member is configured to be accommodated in the pump assembly,
wherein the multi-step structure comprises:
a first step structure having a first inner diameter; and
a second step structure having a second inner diameter,
wherein the first inner diameter is greater than the second inner diameter, and the first step structure is located at a more distal portion of the elastic member compared to the second step structure, and
wherein the second inner diameter matches a diameter of an inner diameter of an adjacent valley in the plurality of valleys.
2. The elastic member of claim 1 , wherein the elastic member is configured to be accommodated in the pump assembly in a partially compressed state.
3. The elastic member of claim 1 , wherein the elastic member is formed of at least one among polyetheretherketone (PEEK), polycarbonate (PC), polyoxymethylene (POM), polyketone (POK), polybutylene terephthalate (PBT), and polyoxypropylene (POP).
4. The elastic member of claim 1 , wherein sizes of each of the plurality of peaks and the plurality of valleys increase in the axial direction.
5. The elastic member of claim 1 , wherein:
the elastic member is a bellows type; and
the connection part is integrally formed along a circumference of the elastic member and a side surface of the elastic member is sealed.
6. The elastic member of claim 5 , wherein at least one air path for releasing air when the elastic member is compressed is disposed in at least one of the first support and the second support.
7. The elastic member of claim 1 , wherein the elastic member is disposed between the stem and the sealing part and is configured to provide an elastic force to the stem from the sealing part.
8. The elastic member of claim 1 , wherein a first outer diameter of the first step structure is greater than a second outer diameter of the second step structure, and the first step structure is located at a more distal portion of the elastic member compared to the second step structure.
9. The elastic member of claim 1 , wherein both of an inner and outer diameter of each step of the multi-step structure increase towards a distal portion of the elastic member.
10. The elastic member of claim 1 , wherein a size of each of the plurality of peaks and the plurality of valleys increases along the axial direction from the first support to the second support.
11. The elastic member of claim 1 , the first support and the second support are made of a material that is more rigid and less elastic than the connection part.