Container and its pump assembly

Abstract

A pump assembly (10) suitable for attachment to a container body (20) includes a pressure bar (2), a main housing (3), and a built-in member (1), the main housing (3) has an inner cylindrical housing (32) surrounding a cylindrical cavity (S1), and an annular space (S2) is defined between the outer cylindrical housing (33) and the inner cylindrical housing (32). An annular cavity (S3) is defined between the outer cylindrical wall (13) and the inner cylindrical wall (12) of the built-in member (1). The bottom wall (22) of the connection part of the pressure bar (2) is provided in the cylindrical cavity (S1), the side wall (23) of the connection part of the pressure bar (2) is in sealing contact with the inner wall surface (32n) of the inner cylindrical housing (32) so as to be slidable, and the piston part (24) is provided in the annular cavity (S3) and is in sealing contact with the outer wall surface (12u) of the inner cylindrical wall (12) and the inner wall surface (13n) of the outer cylindrical wall (13) so as to be slidable. The built-in member (1) is provided in the outer cylindrical housing (33) so as to be movable from a low position (PL) to a high position (PH). The container (100) has a function of discharging contents and includes a pump assembly (10).

Description

Technical Field

[0001] The present invention relates to a pump assembly, and further to a container having a function of discharging contents.

Background Art

[0002] In daily life, containers having a function of discharging contents such as hand soap, medicine, lotion, shampoo, etc. are often used. With this container, the contents therein can be discharged by pressing an operating rod. Chinese Patent CN110155489A describes a pump assembly and a container having a function of discharging contents. In the pump assembly of this container, the outer wall surface of the first inner casing side wall, the inner wall surface of the second inner casing side wall, and the inner casing top shell wall define a first cavity having a first opening. The piston portion is provided in the first cavity and is in sealing contact with the outer wall surface of the first inner casing side wall and the inner wall surface of the second inner casing side wall respectively in a slidable manner, partitioning the first gas cavity and the second gas cavity in the first cavity. The first gas cavity forms a sealed cavity defined by the piston portion, the inner casing top shell wall, the outer wall of the first inner casing side wall, and the inner wall surface of the second inner casing side wall. The rod body is pressed to drive the piston portion to pull the first gas cavity and compress the second gas cavity, discharging the contents of the container body through the discharge passage. The piston portion is repelled by the combined force of the gas pressure in the first gas cavity and the gas pressure in the second gas cavity, repelling the rod body, whereby it is suitable for repressing the rod body again. Therefore, the pump body does not need to provide a spring for repelling the rod body. The pump assembly is all made of plastic material without mixing metal materials, making it easy to recycle the pump assembly. Due to requirements regarding transportation costs and packaging materials, such containers often need to have a retaining bar that can be easily pressed down to the bottom to reduce the overall height of the container. This reduces the space occupied during transportation and the amount of packaging material required. Therefore, there is a need to provide an improved pump assembly that allows a container having a pump assembly to easily press a retaining rod against the bottom without the need for a spring. [Overview of the project]

[0003] The object of the present invention is to provide a pump assembly and container that can achieve repulsion of the retaining rod without providing a spring, and that can easily press the retaining rod against the bottom.

[0004] The present invention provides a pump assembly suitable for mounting to a container body, comprising a retaining rod having a rod body, a connecting bottom wall, a connecting side wall, and a piston portion, wherein the lower end of the rod body is connected to the connecting bottom wall, the connecting side wall protrudes upward from the connecting bottom wall and is installed on the outer circumference of the rod body. The pump assembly further comprises a main housing and an internal component. The main housing has a bottom housing, an inner cylinder housing, and an outer cylinder housing, both of which protrude upward from the bottom housing, the inner cylinder housing encloses a cylindrical cavity, the outer cylinder housing is located on the outer circumference of the inner cylinder housing and defines an annular space between it and the inner cylinder housing, and the bottom housing has a pump suction port in the intermediate portion enclosed by the inner cylinder housing that communicates with the container body. The internal component has a apical shell wall, an inner cylinder wall, and an outer cylinder wall, both of which protrude downward from the apical shell wall, the inner cylinder wall surrounds a through hole through which the rod body passes, and the outer cylinder wall is located on the outer circumference of the inner cylinder wall and defines an annular cavity between it and the inner cylinder wall. The bottom wall of the connection portion is provided in the cylindrical cavity, the side wall of the connection portion slidably seals with the inner wall surface of the inner cylinder housing, and the piston portion is provided in the annular cavity and slidably seals with the outer wall surface of the inner cylinder wall and the inner wall surface of the outer cylinder wall, respectively. The internal component is provided in the outer cylinder housing so as to be movable from a low position to a high position, at the low position the outer cylinder wall of the internal component is at least partially located in the annular space, and at the high position the internal component is provided so as to be lockable in the high position by a locking structure.

[0005] In one embodiment, the outer cylinder wall and the outer cylinder housing are slidably fitted together by the sliding of a slider in a vertical chute, and the slider and the vertical chute are provided on the first and second sides of the outer wall surface of the outer cylinder wall and the inner wall surface of the outer cylinder housing, respectively. In one embodiment, the second side is provided with a circumferential chute, the circumferential chute is in communication with the longitudinal chute, and at the high position, the internal member is locked at the high position by the slider sliding in the circumferential direction within the circumferential chute, and the slider Da The circumferential chute and the locking structure constitute the locking structure. In one embodiment, the circumferential chute is provided with a projection having a surface that gradually increases in height from the proximal to the distal side of the longitudinal chute in the circumferential direction. In one embodiment, a vertically extending protrusion is provided on the inner wall surface of the inner cylinder wall and the first of the outer circumferential surfaces of the rod body, and a groove that slides and fits with the protrusion is provided on the inner wall surface of the inner cylinder wall and the second of the outer circumferential surfaces of the rod body. In one embodiment, the first method is the outer wall surface of the outer cylinder wall. In one embodiment, the pump assembly has a plurality of sliders distributed circumferentially and a plurality of corresponding longitudinal chutes. In one embodiment, the pump assembly is configured such that, with the internal component in the lower position, the bottom wall of the connecting portion of the retaining rod abuts against the bottom housing of the main housing, and there is a vertical gap between the lower end of the outer cylinder wall of the internal component and the bottom housing, and / or the piston portion of the retaining rod abuts against the top shell wall of the internal component and is located above the inner cylinder housing of the main housing. In one embodiment, the pump assembly is configured such that, with the internal component in the elevated position, the retaining rod moves downward against the internal component until it contacts the bottom housing of the main housing, and the piston portion always makes sealing contact with the outer wall surface of the inner cylinder wall and the inner wall surface of the outer cylinder wall, respectively, and / or allows the height difference between the lower ends of the inner and outer cylinder walls of the internal component and the upper end of the inner cylinder housing of the main housing to be less than 10% of the height of the outer cylinder housing.

[0006] The present invention provides a container having a function for discharging contents, comprising a container body, the container further comprising the pump assembly, the pump assembly being attached to the container body and discharging the contents inside the container body. In the above-described pump assembly and container, the piston portion of the retaining rod is provided within an annular cavity between the outer and inner cylinder walls of the internal component. Therefore, during the process of pressing down the retaining rod, a restoring force is provided that causes the retaining rod to spring upward due to the differential pressure on both the upper and lower sides of the piston portion. Furthermore, the main housing has an inner cylinder housing inside the outer cylinder housing, and the bottom wall of the connecting portion is installed within a cylindrical cavity surrounded by the inner cylinder housing. The outer cylinder wall of the internal component is aligned with the annular space between the outer and inner cylinder housings, allowing the retaining rod to be smoothly pressed to the bottom. Thus, the rebound of the retaining rod can be achieved without a spring, and the retaining rod can be easily pressed to the bottom. The overall structure of the pump assembly and container is compact, saving on packaging and transportation costs. [Brief explanation of the drawing]

[0007] The above and other features, properties, and advantages of the present invention will become further apparent from the following description relating to the accompanying drawings and examples. Figure 1A is a schematic diagram showing the container in a state where both the retaining rod and the internal components are in their lowest positions, and in this state, the vertical dimension of the entire container is at its smallest. Figure 1B is a schematic diagram showing the container in a state where both the retaining rod and the internal components are in their highest positions, and at this time, the vertical dimension of the entire container is at its largest. Figure 1C is a schematic diagram showing the state in the container where the internal components are in the highest position and the retaining rod is in the lowest position. Figure 2 is a schematic diagram showing the pump assembly in a state where both the retaining rod and the internal components are in their lowest positions. Figure 3 is a schematic diagram showing a pump assembly where both the retaining rod and the internal components are in an intermediate position. Figure 4 is a schematic diagram showing the pump assembly in a state where both the retaining rod and the internal components are in their highest position. Figure 5A is a plan view showing the slider on the outer cylinder wall of the internal component and the vertical chute of the outer cylinder housing of the main housing when they are fitted together. Figure 5B is a schematic diagram showing the state when the slider on the outer cylinder wall of the internal component slides from the state shown in Figure 5A to the circumferential chute of the outer cylinder housing of the main housing. Figure 5C is a schematic diagram showing the state when the slider on the outer cylinder wall of the internal component slides further from the state shown in Figure 5B to the state where it is locked to the circumferential chute. Figure 6 is a schematic diagram showing the pump assembly with the internal components in the highest position and the retaining rod in the intermediate position. Figure 7 is a schematic diagram showing the pump assembly in the state where the internal components are in the highest position and the retaining rod is in the lowest position. Figure 8A is a schematic diagram showing the state in which the check valve body at the tip of the retaining rod is blocking the discharge passage. Figure 8B is a schematic diagram showing the check valve body at the tip of the retaining rod in the state where it is opening the discharge passage. Figure 8C is a schematic diagram showing the three-dimensional structure of the retaining rod and head cap. Figure 9 is a perspective view showing the three-dimensional structure of the outer cylinder housing of the main housing and the rod body of the retaining rod. Figure 10 is a perspective view of the check valve body at the tip of the retaining rod. Figure 11 is a plan view of the check valve body shown in Figure 10. Figure 12 is a magnified view of a portion of point E in Figure 1B. Figure 13 is a perspective view showing the disassembled structure of the head cap and retaining cap. Figure 14 is a schematic diagram showing the head cap projection in the retraction space. Figure 15 is a schematic diagram showing the projection of the head cap fitted into the recess of the retaining cap. Best Embodiment of the Invention

[0008] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings. In the following description, various details will be explained to make the present invention easier to understand, but it is clear that the present invention can be implemented in forms different from those described above, and it goes without saying that the scope of protection of the present invention is not limited to the specific embodiments described above, as it can be extended and inferred according to actual application situations without departing from the spirit of the invention by those skilled in the art.

[0009] For example, the phrase "the first feature is formed above or on top of the second feature," as described later in this specification, may include embodiments in which the first and second features are formed in direct relation to each other, or it may include embodiments in which an additional feature is formed between the first and second features, thereby preventing the first and second features from being directly related. Furthermore, where the first element is described in a manner in which it is connected to or coupled to the second element, this description includes embodiments in which the first and second elements are directly connected to or coupled to each other, as well as embodiments in which the first element is indirectly connected to or coupled to the second element by adding one or more other intervening elements. Figures 1A, 1B, and 1C show exemplary configurations of a container 100 having a contents discharge function in different states. The container 100 has a container body 20. The container 100 further comprises a pump assembly 10. The pump assembly 10 is attached to the container body 20 and discharges the contents CW from the container body 20.

[0010] Figures 2 to 9 show exemplary configurations of the pump assembly 10. As mentioned above, the pump assembly 10 is suitable for mounting on the container body 20. Furthermore, the attached drawings are merely illustrative and are not drawn under conditions of equal proportion; therefore, they should not be considered as limiting the scope of protection actually claimed by this invention.

[0011] Referring to Figure 2, the pump assembly 10 includes a retaining rod 2. Figures 8A to 8C show an exemplary configuration of the retaining rod 2. As shown in Figures 2 and 8A to 8C, the retaining rod 2 has a rod body 21, a connection bottom wall 22, a connection side wall 23, and a piston portion 24. The rod body 21 defines the discharge passage 210. The lower end 21w of the rod body 21 is connected to the connection bottom wall 22. The connection side wall 23 is provided on the outer circumference of the rod body 21, protruding upward from the connection bottom wall 22. The piston portion 24 is connected to the upper end 23h of the connection side wall 23. In the drawings, the discharge passage 210 is also the rod hole of the retaining rod 2 (specifically, the rod body 21). In this specification, spatial relation terms such as "up," "down," "vertical," "high," and "low" are used to describe the relationship between one element or feature and another shown in the attached drawings. This is to facilitate explanation by referring to the orientation in the normal state shown in Figures 1A, 1B, and 1C, and these spatial relation terms are intended to include orientations other than those depicted in the attached drawings for elements or assemblies in use or operation. For example, if the assembly in the attached drawings is inverted, the orientation of an element described as being above another element or feature changes to being below the other element or feature, and the spatial relation terms used in this text should be interpreted accordingly. The pump assembly 10 further comprises a main housing 3 and an internal component 1. Referring to Figure 6, the main housing 3 has a bottom housing 31, an inner cylinder housing 32, and an outer cylinder housing 33. Both the inner cylinder housing 32 and the outer cylinder housing 33 protrude upward from the bottom housing 31. The inner cylinder housing 32 surrounds a cylindrical cavity S1. The outer cylinder housing 33 is located on the outer circumference of the inner cylinder housing 32 and defines an annular space S2 between it and the inner cylinder housing 32. The bottom housing 31 has a pump suction port P1 in an intermediate portion 310 surrounded by the inner cylinder housing 32 that communicates with the container body 20. In the illustrated embodiment, the main body of the pump assembly 10 may be a rotating body that rotates approximately around the central axis O1. Therefore, for convenience, the following description may also refer to the vertical direction X1 (up and down in Figure 2, i.e., the direction along the central axis O1 of the pump assembly 10), the radial direction R0 (i.e., the direction to the left or right of the central axis O1 of the pump assembly 10 in Figure 2), and the circumferential direction C0 (i.e., the direction of rotation around the central axis O1, as shown in Figures 5B and 5C) of the pump assembly 10 in Figure 2. This description does not limit the cross-section of the specific parts of the pump assembly 10 to being circular. For example, the inner cylinder housing 32 and the outer cylinder housing 33 do not need to have a circular cross-section and may be cylindrical bodies with other shapes such as square or rectangular cross-sections.

[0012] Continuing to refer to Figure 6, the internal component 1 has a apical shell wall 11, an inner cylinder wall 12, and an outer cylinder wall 13. Both the inner cylinder wall 12 and the outer cylinder wall 13 protrude downward from the apical shell wall 11. The inner cylinder wall 12 surrounds the through hole H1 through which the rod body 21 passes. The outer cylinder wall 13 is located on the outer circumference of the inner cylinder wall 12 and defines an annular cavity S3 between it and the inner cylinder wall 12. As shown in Figures 2 and 6, the bottom wall 22 of the connection portion of the retaining rod 2 is provided in the cylindrical cavity S1. The side wall 23 of the connection portion of the retaining rod 2 is in slidable sealing contact with the inner wall surface 32n of the inner cylinder housing 32. The piston portion 24 of the retaining rod 2 is provided in the annular cavity S3 and is in slidable sealing contact with the outer wall surface 12u of the inner cylinder wall 12 and the inner wall surface 13n of the outer cylinder wall 13, respectively. Note that "slidable sealing contact" means that the two elements are slidable relative to each other while maintaining a seal between the sliding fitting interfaces. This can be achieved, for example, by the deformable characteristics of the material, plastic itself, and by providing a sufficient area of ​​the sliding fitting interface to maintain a seal. For example, the outer diameter of the side wall 23 of the cylindrical connection portion of the retaining rod 2 can be set to be slightly larger than the inner diameter of the inner cylinder housing 32 under normal conditions (i.e., when no external force is applied), thereby forming a tight fit between them and improving sealing performance. Taking "the inner wall surface 32n of the inner cylinder housing 32" as an example, the inner wall surface 32n refers to the wall surface located radially inward of the inner cylinder housing 32. The internal component 1 is provided in the outer cylinder housing 33 so as to be movable from a low position PL (e.g., Figure 2) to a high position PH (e.g., Figure 6). Note that "low" and "high" here are relative terms. At the lower position PL, the outer cylinder wall 13 of the internal component 1 is at least partially located within the annular space S2. As shown in Figure 2, the outer cylinder wall 13 is located within the annular space S2 for most of the length X1 (i.e., more than 50%), and is located between the inner cylinder housing 32 and the outer cylinder housing 33 in the radial direction R0. At a high position PH, the internal component 1 is set to be lockable at the high position PH by the locking structure 4. For example, the internal component 1 has a radial lateral hole extending along the radial direction R0 at a predetermined position, and the outer cylinder housing 33 also has a corresponding lateral hole. When the internal component 1 reaches the high position PH, the insertion pin can be manually inserted through the radial lateral hole and its corresponding lateral hole, thereby connecting the internal component 1 and the outer cylinder housing 33 and locking the internal component 1. In other words, the radial lateral hole, the corresponding lateral hole, and the insertion pin can be considered as the locking structure 4.

[0013] In the above pump assembly 10, the connection part bottom wall 22 of the pressing bar 2 is provided in a cylindrical cavity S1 surrounded by the inner cylinder housing 32 of the main housing 3 and moves up and down. The outer cylinder wall 13 of the built-in member 1 can move up and down in an annular space S2 between the outer cylinder housing 33 and the inner cylinder housing 32 of the main housing 3. When the built-in member 1 is not locked at the high position PH via the lock structure 4, the pressing bar 2 can push down the built-in member 1 to the bottom, for example, to the low position PL in FIG. 2, by the piston part 24 making seal contact with the built-in member 1. In this case, the vertical dimension of the entire pump assembly 10 and the container 100 is small, and the structure is compact. For example, it can be in a packaged state of the container 100, and the packaging cost and transportation cost can be saved. It should be noted that in this process, the pump suction port P1 is always closed via the check valve body 9 (substantially reverse-tapered in the figure) without the content CW in the container body 20 flowing out. When in use, the pressing bar 2 can be lifted. At this time, the built-in member 1 follows the pressing bar 2 and moves from the low position P1 in FIG. 2 to the high position PH in FIG. 4 along the vertical direction X1 via the intermediate position PM in FIG. 3, and then can be locked at the high position PH via the lock structure 4. It should be noted that in the process from FIG. 2 to FIG. 4, the check valve body 9 gradually opens the pump suction port P1, and a part of the content CW is accumulated from the container body 20 into the cylindrical cavity S1. Subsequently, the internal component 1 is held at a high position PH, and the retaining rod 2 can press against the internal component 1 from a higher position in Figure 4, through an intermediate position in Figure 6, to a lower position in Figure 7. The piston 24 can partition the annular cavity S3 along the vertical direction X1 into a lower cavity S32 and a closed upper cavity S31, so as the retaining rod 2 moves downward relative to the internal component 1, the differential pressure between the lower cavity S32 and the upper cavity S31 increases, providing an elastic restoring force that causes the retaining rod 2 to rebound upward. Notably, in the process from Figures 4, 6 to 7, the check valve body 9 gradually closes the pump suction port P1. After repeatedly lifting and pressing the retaining rod 2, a sufficient amount of contents CW accumulates in the cylindrical cavity S1 and is then discharged through the discharge passage 210. Therefore, the container 100 equipped with the pump assembly 10 can easily press the retaining rod 2 to the bottom without the need for a spring.

[0014] As an example of operation, the user can push the air inside the cylindrical cavity S1 through the middle discharge passage 210 of the presser rod 2 and out via the head cap 6 by pressing the head cap 6, which is connected to the presser rod 2 described later. If the user does not apply any force to the head cap 6, the head cap 6 and the presser rod 2 will rebound and rise due to the restoring force caused by the differential pressure between the lower cavity S32 and the upper cavity S31, creating negative pressure in the cylindrical cavity S1. This allows the contents CW inside the container body 20, such as liquid, to be sucked out through the pump suction port P1 until the cylindrical cavity S1 is full. After it is full, when the user presses down on the head cap 6 and the presser rod 2 again, the liquid inside the cylindrical cavity S1 is pressed by the bottom wall 22 of the connection part of the presser rod 2 and pumped out via the discharge passage 210 of the presser rod 2 and the head cap 6. The specific process for discharging the contents by pressing can be found, for example, in Chinese Patent CN109649819A, and will not be explained further here. In addition, the "vertical", "coincident", "parallel", etc. in two directions mentioned in the text do not necessarily need to meet the strictly mathematical angular requirements, and a certain error range is allowed. For example, it is allowed to be different by within 20° from the mathematically required angle. "Along a certain direction" or "in a certain direction" means that there is at least a component in that direction. Preferably, the angle with that direction is within 45°, more preferably within 20°, even 10°, or within 5°. Note that the ranges mentioned in the text all include the end values mentioned.

[0015] In the illustrated embodiment, the built-in member 1 can move between a high position PH and a low position PL in the outer cylinder housing 33 by means of a sliding fit between the outer cylinder wall 13 and the outer cylinder housing 33. In addition, in this text, specific terms are used to describe the embodiments of the present invention. For example, "one embodiment", "another embodiment", and / or "some embodiments" mean features, structures, or characteristics related to at least one embodiment of the present invention. Therefore, it should be emphasized and noted that "one embodiment" or "another embodiment" mentioned more than twice at different positions in this specification does not necessarily refer to the same embodiment. Furthermore, the features, structures, or characteristics of one or more embodiments of the present invention may be appropriately combined. Referring to FIGS. 5A and 9, the outer cylinder wall 13 and the outer cylinder housing 33 can be slidably fitted by the slider 131 sliding in the vertical chute 331. The slider 131 and the vertical chute 331 may be provided on the first and second of the outer wall surface 13u of the outer cylinder wall 13 and the inner wall surface 33n of the outer cylinder housing 33, respectively. That is, when the slider 131 is provided on the outer wall surface 13u of the outer cylinder wall 13, the vertical chute 331 is provided on the inner wall surface 33n of the outer cylinder housing 33. The slider 131 may be provided on the inner wall surface 33n of the outer cylinder housing 33. At this time, the vertical chute 331 is provided on the outer wall surface 13u of the outer cylinder wall 13. In the illustrated embodiment, the first is the outer wall surface 13u of the outer cylinder wall 13. That is, the second is the inner wall surface 33n of the outer cylinder housing 33. In this text, terms such as "first," "second," etc., are used to limit the features, but this is simply to make it easier to distinguish between corresponding features. Unless otherwise specified, these terms have no special meaning and cannot be understood as limiting the scope of protection of the present invention.

[0016] Continuing to refer to Figure 9, the circumferential chute 332 is provided with a projection 3321. The projection 3321 has a side surface 3322 (also shown in Figure 2) that gradually rises from the proximal side to the distal side of the longitudinal chute 331 in the circumferential direction C0. The proximal side of the longitudinal chute 331 and teeth, Vertical Shot 331 In the corresponding circumferential chute 332 It is the near side, and the distal side teeth, Vertical Shot 331 Corresponding circumferential chute 332 This is the side away from the circumferential chute. In Figure 5A, for each longitudinal chute 331, the corresponding circumferential chute 332 extends counterclockwise from the longitudinal chute 331 along the circumferential direction C0.

[0017] The pump assembly 10 may include a plurality of sliders 131 distributed in the circumferential direction C0 and a plurality of corresponding longitudinal chutes 331. In this text, "a plurality" means two or more, including two, three, four, five, etc. In Figure 5A, the pump assembly 10 may include three sliders 131 evenly distributed along the circumferential direction C0 and three corresponding longitudinal chutes 331. Furthermore, the pump assembly 10 may also include three circumferential chutes 332 that communicate with each of the three longitudinal chutes 331. Continuing to refer to Figure 9, the circumferential chute 332 is provided with a projection 3321. The projection 3321 has a side surface 3322 (also shown in Figure 2) that gradually rises from the proximal side to the distal side of the longitudinal chute 331 in the circumferential direction C0. The proximal side of the longitudinal chute 331 is the side closer to the longitudinal chute 331 corresponding to the circumferential chute 332, and the distal side is the side further away from the longitudinal chute 331 corresponding to the circumferential chute 332. In Figure 5A, for each longitudinal chute 331, the corresponding circumferential chute 332 extends counterclockwise from the longitudinal chute 331 along the circumferential direction C0. As shown in Figures 5A and 9, the inner wall surface 12n of the inner cylinder wall 12 and the first outer circumferential surface 21u of the rod body 21 are provided with a protrusion 211 extending along the vertical direction X1, and the second inner wall surface 12n of the inner cylinder wall 12 and the second outer circumferential surface 21u of the rod body 21 are provided with a groove 121 that slides and fits with the protrusion 211. In the illustrated embodiment, the outer circumferential surface 21u of the rod body 21 is used as an example of the first side, and the inner wall surface 12n of the inner cylinder wall 12 is used as an example of the second side. That is, the protrusion 211 extending in the vertical direction X1 is provided on the outer circumferential surface 21u of the rod body 21, and the groove 121 that slides and fits with the protrusion 211 is provided on the inner wall surface 12n of the inner cylinder wall 12. In this way, the internal member 1 can slide and fit with the retaining rod 2 via the groove 121 and the protrusion 211, and they are not rotatable relative to each other.

[0018] Referring to Figure 2, the pump assembly 10 allows the bottom wall 22 of the connection portion of the retaining rod 2 to contact the bottom housing 31 of the main housing 3 when the internal component 1 is in a low position PL, and in Figure 2, it contacts the bottom housing 31 via the check valve body 9. When the internal component 1 is in a low position PL, the pump assembly 10 further allows a gap in the vertical direction X1 between the lower end 13w of the outer cylinder wall 13 of the internal component 1 and the bottom housing 31. In other words, when the bottom wall 22 of the connection portion of the retaining rod 2 contacts the bottom housing 31 of the main housing 3, the internal component 1 is considered to be in a low position PL, and at this time, the lower end 13w of the outer cylinder wall 13 of the internal component 1 does not contact the bottom housing 31, and there is a gap in the vertical direction X1 between it and the bottom housing 31. When the internal component 1 is in a low position PL, the pump assembly 10 further allows the piston portion 24 of the retaining rod 2 to abut against the top shell wall 11 of the internal component 1 and to be above the inner cylinder housing 32 of the main shell 3. That is, the top of the piston portion 24 of the retaining rod 2 can abut against the bottom surface of the top shell wall 11 of the internal component 1, and the two cannot continue to move toward each other. When the bottom wall 22 of the connection portion of the retaining rod 2 abuts against the bottom housing 31 of the main housing 3, the bottom of the piston portion 24 of the retaining rod 2 does not interfere with the upper end 32h of the inner cylinder housing 32 of the main housing 3. In Figure 2, the piston portion 24 of the retaining rod 2 is in close contact with the upper end 32h of the inner cylinder housing 32 of the main housing 3, and for example, the distance between the lowest point of the piston portion 24 and the upper end 32h of the inner cylinder housing 32 does not exceed 5 mm, and is even close to zero. This can be achieved according to the specific size.

[0019] Referring to Figure 7, the pump assembly 10, with the internal member 1 in a high position PH, moves the retaining rod 2 downward relative to the internal member 1 until it contacts the bottom housing 31 of the main housing 3 (for example, from Figure 4 through Figure 6 to Figure 7), allowing the piston portion 24 to always be in sealing contact with the outer wall surface 12u of the internal member cylinder wall 12 and the inner wall surface 13n of the outer cylinder wall 13. That is, the piston portion 24 never disengages from the annular cavity S3 between the inner cylinder wall 12 and the outer cylinder wall 13. Furthermore, as shown in Figure 7, with the internal member 1 in a high position PH, the pump assembly 10 further allows the height difference between the lower ends 12w, 13w of the inner cylinder wall 12 and outer cylinder wall 13 of the internal member 1 and the upper end 32h of the inner cylinder housing 32 of the main housing 3 to be less than 10% of the height of the outer cylinder housing 33. 3 w may be higher than the upper end 32h of the inner cylinder housing 32, lower than the upper end 32h of the inner cylinder housing 32, or it may be flush with the surface. For example, in Figure 7, the lower ends 12w and 13w of the inner cylinder wall 12 and outer cylinder wall 13 of the internal component 1 are at approximately the same height and are both approximately flush with the upper end 32h of the inner cylinder housing 32 of the main housing 3. This can be achieved according to the specific size.

[0020] Referring to Figures 1B, 8A, and 8B, a check valve body 5 may be provided at the tip of the discharge passage 210 to allow fluid to flow out of the discharge passage 210. In other words, the check valve body 5 is installed at the upper end of the retaining rod 2 of the container 100 and allows the contents CW of the container 100 to flow out in one direction from the discharge passage 210 of the retaining rod 2. That is, the check valve body 5 allows the contents CW to flow out from the discharge passage 210 of the retaining rod 2 and prevents the contents CW from flowing into the discharge passage 210 of the retaining rod 2 from the outside. The container 100 may further include a head cap 6 that, together with the retaining rod 2 and the check valve body 5, constitutes a retaining cap assembly. Figure 10 shows the three-dimensional structure of the check valve body 5 when it is inverted, and Figure 11 shows the planar structure of the check valve body 5. The check valve body 5 has a column portion 51 and a cover portion 52. As shown in Figure 8B, the cover portion 52 is connected to the upper end of the column portion 51. In Figure 11, a cross-section of the column portion 51 of the check valve body 5 can be seen, and in particular the cross-section of the discharge passage 210, that is, the cross-section of the hole in the retaining rod 2 (specifically, the rod body 21). The cross-section is perpendicular to the extension direction of the column portion 51 or the extension direction of the discharge passage 210 (i.e., the depth direction of the hole in the rod hole), that is, it is a cross-section that extends horizontally in the state shown in Figure 1A.

[0021] As shown in Figure 11, the outer contour of the cross-section of the column portion 51 has a plurality of points, for example, point M1. These plurality of points are located on the same annular line CL. The outer contour has other points, for example, point M2, located inside the annular line CL, excluding the plurality of points. In Figure 11, the annular line CL is shown as a dashed line. Note that the plurality of points may be spaced apart from each other. The plurality of points may also be partially continuous, so that they can form a curve. The annular line CL is geometrically reduced compared to the contour line CI of the cross-section of the discharge passage 210. The contour line CI is shown as a dashed line in Figure 11. In other words, the annular line CL can be obtained by reducing the entire contour line CI. For example, the contour line CI can be reduced to 98%, thereby obtaining the annular line CL. That is, the annular line CL has the same shape as the contour line CI, but its dimensions are smaller than those of the contour line CI.

[0022] Referring to Figure 8A, the column portion 51 of the check valve body 5 is inserted into the discharge passage 210, and the lid portion 52 is placed on the retaining rod 2 and closes the discharge passage 210. As a result, the column portion 51 is positioned within the discharge passage 210 via the multiple points M1, and a flow passage S5 is defined between it and the discharge passage 210 via the other points M2, allowing the contents CW to pass through. The above-mentioned check valve body 5 adopts a specific shape as the cross-section of the column portion 51 to provide a flow passage S5 for the contents CW to pass through, and the column portion 51 can be stably positioned in the discharge passage 210 by the multiple points M1, making it less prone to shaking. In the above-described check valve body 5, the discharge passage 210 may be a round hole. That is, the cross-section of the discharge passage 210 is circular. The outer contour of the cross-section of the column portion 51 may have a plurality of spaced-apart arc segments A0. Each of these arc segments A0 may be located on an annular line CL, and the plurality of points M1 may constitute the plurality of arc segments A0. In this case, the plurality of points may be divided into a plurality of groups of points, and the points of each group may be continuously distributed to constitute a single arc segment A0.

[0023] Referring to Figures 10 and 11, the outer contour of the cross section of the column 51 may be cross-shaped. Furthermore, the outer contour may be cross-shaped and simultaneously have multiple arc segments A0. That is, these multiple arc segments A0 are four arc segments A0, and each arc segment A0 constitutes the outermost surface of each spoke 511 of the four cross-shaped, outwardly radiating spokes 511. In another embodiment, the line of the outermost surface of each spoke 511 constituting the cross may be a straight segment, and the two endpoints of the straight segment belong to the plurality of points and are both located on the annular line CL. As shown in Figures 10 and 11, the lid 52 may be plate-shaped. As shown in Figure 11, the outer contour of the cross-section of the lid 52 surrounds the contour line CI of the discharge passage 210, thereby blocking the discharge passage 210, which can be seen in Figure 8A. In the figure, the outer surface of the column portion 51 may be a column surface. The column surface is a curved surface formed by moving a moving straight line parallel to a constant curve. The moving straight line is called the parapet of this column surface, and the constant curve is called the directrix of this column surface. The constant curve is a closed curve relative to the outer surface of the column portion 51. That is, each cross-section of the column portion 51 is identical, not only in shape but also in angular position.

[0024] Referring to Figure 11, the distance t1 between the annular line CL and the contour line CI may be within 0.1 mm. In the illustrated embodiment, if the annular line CL is a ring, that is, the radius of the annular line CL is within 0.1 mm smaller than the radius of the circular hole that becomes the discharge passage 210. In practice, by providing a minimum gap of 0.1 mm or less between the column portion 51 and the discharge passage 210, the check valve body 5 can be stably positioned in the discharge passage 210 of the retaining rod 2. In a retaining cap assembly consisting of a retaining rod 2 and a head cap 6, the head cap 6 has an outlet passage 61, the retaining rod 2 has a discharge passage 210, and the retaining rod 2 is connected to the head cap 6. The retaining cap assembly may further include the check valve body 5 described above. The lid portion 52 of the check valve body 5 is housed in the outlet passage 61 of the head cap 6, and the column portion 51 of the check valve body 5 is inserted into the discharge passage 210 of the retaining rod 2, thereby allowing the contents CW of the container 100 to flow out in one direction from the discharge passage 210 to the outlet passage 61. In the illustrated embodiment, the outlet passage 61 may have a vertical hole 612 and a horizontal hole 611. The lower end of the vertical hole 612 can communicate with the discharge passage 210 (the upper end of the discharge passage 210 in Figure 8A), and the upper end of the vertical hole 612 communicates with the horizontal hole 611 (the left end of the horizontal hole 611 in Figure 8A). The cover 52 of the check valve body 5 is housed in the vertical hole 612.

[0025] Figure 8A shows the state of the retaining cap assembly as viewed from the right side of Figure 1B, and Figure 12 shows a partially enlarged structure of point E in Figure 1B. In accordance with Figures 8A and 12, a protruding column 62 is provided in the vertical hole 612, projecting downward. In the figures, the protruding column 62 projects downward from the upper surface of the vertical hole 612. The protruding column 62 obscures a portion of the cross-section of the horizontal hole 611. That is, the protruding height of the protruding column 62 is sufficient to obscure a portion of the cross-section of the horizontal hole 611, for example, by 50% of the cross-section in height. The cover portion 52 of the check valve body 5 is installed so as to abut against the lower end of the protruding column 62 to stop further upward movement, as shown in Figure 8B. By providing the protruding column 62, it is possible to effectively prevent the cover portion 52 from being deflected into the horizontal hole 611.

[0026] Referring to Figure 12, the upper end of the retaining rod 2 is fitted into the vertical hole 612, thereby connecting the retaining rod 2 to the head cap 6. In the figure, a recess 221 can be provided on the outer circumferential surface of the upper end of the retaining rod 2, and a projection 613 can be provided on the inner surface of the vertical hole 612. When the upper end of the retaining rod 2 is inserted into the vertical hole 612 and the projection 613 is fitted into the recess 221, engagement between the retaining rod 2 and the head cap 6 is achieved. Next, the operation process of the check valve body 5 described above within the container 100 will be explained illustratively. Initially, as shown in Figure 8A, the check valve body 5 is resting on the upper end of the retaining rod 2 via the lid 52 due to gravity. During the process of pressing the retaining rod 2 from Figure 4 through Figure 6 to Figure 7, air or contents CW can move upward from the discharge passage 210 of the retaining rod 2, and when it reaches the upper end of the retaining rod 2, it pushes the check valve body 5 upward from Figure 8A to Figure 8B. At this time, the contents CW travels through the flow passage S5 defined between the other point M2 and the discharge passage 210 (hole wall of the rod hole), then through the gap between the lid 52 and the vertical hole 612 to the horizontal hole 611, and is discharged via the outlet passage 61. As a specific example, the vertical length of the column portion 51 of the check valve body 5 is 5.9 mm, the cover portion 52 is a disc with a diameter of, for example, 4.9 mm and a vertical thickness of, for example, 1 mm, the diameter of the annular wire CL is, for example, 2.93 mm, and the diameter of the hole in the discharge passage 210 is, for example, 3 mm. The above check valve body 5 can be stably positioned in the discharge passage 210 of the retaining rod 2 and is less prone to shaking. Furthermore, the above check valve body 5 has a simple structure, is easy to manufacture, and is low-cost. The container 100 may further have a retaining cap 7 that, together with the head cap 6, constitutes a retaining cap assembly, and the retaining cap assembly may further have a retaining rod 2. The retaining rod 2 is provided on the container body 20 so as to be pressable in the vertical direction X1 (i.e., the up and down direction). The vertical direction X1 is also the direction along the central axis O1 of the container 100, pump assembly 10, retaining rod 2, etc., and is also called the axial direction of the container 100, pump assembly 10, and retaining rod 2, and is also the direction of the pressing activity of the retaining rod 2.

[0027] Figure 13 shows the disassembled structure of the head cap 6 and the retaining cap 7. As shown in Figure 1B, the retaining cap 7 is often called the large ring and can be attached to the container body 20, while the head cap 6 is connected to the retaining rod 2. The first of the retaining cap 7 and the head cap 6 may have a fitting column 81. A recess 812 is provided on the outer column surface 811 of the fitting column 81. The second of the retaining cap 7 and the head cap 6 has a fitting hole 82, and a projection 822 is provided on the inner hole surface 821 of the fitting hole 82. In the illustrated embodiment, the first is the retaining cap 7, that is, the second is the head cap 6. Next, an example in which the fitting column 81 is provided on the retaining cap 7 and the fitting hole 82 is provided on the head cap 6 will be described. As shown in Figures 13 to 15, the fitting column 81 is provided so as to be insertable into the fitting hole 82, and the head cap 6 is provided so as to be switchable from a first position PC1 (shown in Figure 15) to a second position PC2 (shown in Figure 14) in the circumferential direction C0 relative to the retaining cap 7. As shown in Figure 15, in the first position PC1, the projection 822 fits into the recess 812, thereby restricting the movement of the head cap 6 along the vertical direction X1 relative to the retaining cap 7. As shown in Figure 14, in the second position PC2, the projection 822 is located in the retraction space S6 formed between the outer column surface 811 of the fitting column 81 and the inner hole surface 821 of the fitting hole 82, allowing the head cap 6 to move in the vertical direction X1 relative to the retaining cap 7. The circumferential direction C0 is the direction around the retaining movement path of the retaining rod 2. When in use, the head cap 6 can be positioned at the first position PC1 relative to the retaining cap 7. At this time, the projection 822 of the head cap 6 fits into the recess 812 of the retaining cap 7, and the head cap 6 cannot move along the vertical direction X1 relative to the retaining cap 7, thus fixing the head cap 6 in the vertical direction X1 relative to the retaining cap 7. In other words, unless there is sufficient external force, it cannot move along the vertical direction X1 relative to the retaining cap 7. Therefore, the retaining rod 2 cannot press against the container body 20, i.e., it is held in a predetermined position. By rotating the head cap 6 from the first position PC1 to the second position PC2 relative to the retaining cap 7, the projection 822 is positioned in the retraction space S6 formed between the outer circumferential surface 811 of the fitting column 81 and the inner hole surface 821 of the fitting hole 82, allowing the head cap 6 to move along the vertical direction X1 relative to the retaining cap 7, i.e., allowing the retaining rod 2 to flexibly press against the container body 20.

[0028] Referring to Figure 13, the outer column surface 811 of the compatible column 81 may have an arc column surface 813 with an arc line as the reference line, and a retractable column surface 814 with a line recessed from the arc line as the reference line. The retractable column surface 814 can be connected to the arc column surface 813, that is, the retractable column surface 814 is adjacent to the arc column surface 813. The recess 812 may be provided in the arc column surface 813. The directrix of the arc-shaped column surface 813 is the arc line, and the directrix of the retractable column surface 814 is a line that is concave relative to the arc line. As mentioned above, the directrix is ​​also a constant curve that forms the column surface. That is, the line that is the directrix of the retractable column surface 814 may be any curve that is concave relative to the arc line toward the central axis O1, and may include a straight line. It is sufficient that any point on this curve is close to the central axis O1 relative to the arc line. In the illustrated embodiment, this line is a straight line, that is, the retractable column surface 814 is a plane. The inner surface 821 of the fitting hole 82 may be a cylindrical surface that fits the arcuate surface 813 of the fitting column 81. That is, if the fitting column 81 is complemented as a complete cylinder along the arc line of the arcuate surface 813, the fitting hole 82 may be a clearance fit with the cylinder, and for example, the diameter of the fitting hole 82 may be within 1 mm of the diameter of the cylinder. In this way, the inner surface 821 of the fitting hole 82 is compatible with the arcuate surface 813 of the fitting column 81. If the projection 822 is ignored, the fitting column 81 can be properly fitted into the fitting hole 82.

[0029] As shown in Figure 14, at the second position PC2, the projection 822 can be located within the retraction space S6 formed between the retraction column surface 814 and the inner bore surface 821. The above installation is achieved by fitting and positioning the arc-shaped column surface 813, whose reference line is an arc, with the fitting hole 82, and by forming a retraction space S6 between the retraction column surface 814, whose reference line is recessed relative to the arc, and the inner hole surface 821, thereby accommodating the projection 822 without hindering the head cap 6 from moving along the vertical direction X1 relative to the retaining cap 7. Furthermore, when the head cap 6 switches from a first position PC1 to a second position PC2 relative to the retaining cap 7 in the circumferential direction C0, the head cap 6 may rotate directly from the first position PC1 to the second position PC2. Alternatively, when the head cap 6 switches from a first position PC1 to a second position PC2 relative to the retaining cap 7, the head cap 6 may move in the vertical direction X1 relative to the retaining cap 7 before rotating. For example, in the illustrated embodiment, as will be described later, the head cap 6 moves upward along the vertical direction X1 relative to the retaining cap 7 from the state in Figure 15, rotates, and then moves downward along the vertical direction X1 until it reaches the state in Figure 14.

[0030] Figure 1 3As shown, the outer column surface 811 of the fitting column 81 may have two arcuate column surfaces 813 distributed symmetrically with respect to the first symmetry line L1. The outer column surface 811 of the fitting column 81 may also have two retractable column surfaces 814 distributed symmetrically with respect to the second symmetry line L2. The first symmetry line L1 and the second symmetry line L2 may be perpendicular to each other. This allows the head cap 6 to rotate from the first position PC1 to the second position PC2 whether it is inverted or rotated forward, making operation more convenient. Each of the two arc-shaped prism surfaces 813 may be provided with a recess 812. Furthermore, the recesses 812 of the two arc-shaped prism surfaces 813 may be distributed symmetrically with respect to the first symmetry line L1. Additionally, as shown in Figure 15, the fitting hole 82 may be provided with two projections 822, and at the first position PC1, the two projections 822 can be fitted into the recesses 812 of the two arc-shaped prism surfaces 813, respectively.

[0031] In the illustrated embodiment, the projection 822 can be elastic and, for example, made of a plastic having a certain degree of elasticity. This elasticity allows the projection 822 to disengage from the recess 812 with a predetermined external force along the longitudinal direction X1. For example, the projection 822 can be detached from the recess 812 by manually pulling the head cap 6 upward. For example, the predetermined external force may be within 10 N. Furthermore, as shown in Figure 7, the recess 812 can also restrict the circumferential movement of the head cap 6 relative to the retaining cap 7. For example, the recess 812 may be in the form of a depression. At this time, the head cap 6 is pulled manually to detach the projection 822 from the recess 812, and then the head cap 6 (pressing rod 2) is rotated relative to the pressing cap 7 to the position of the corresponding retraction space S6 for the projection 822. After that, the pressing rod 2 can move freely up and down relative to the pressing cap 7 together with the head cap 6.

[0032] In another embodiment, the recess 812 may be a groove extending in the circumferential direction C0 such that the projection 822 naturally disengages from the recess when the head cap 6 rotates from a first position PC1 to a second position PC2. In this case, the head cap 6 (retaining rod 2) can be rotated relative to the retaining cap 7 so that the projection 822 moves away from the recess 812 and reaches the retraction space S6. After that, the retaining rod 2 can move freely up and down relative to the retaining cap 7 together with the head cap 6. In the illustrated embodiment, the retaining cap 7 may have a support column 83. The fitting column 81 can protrude from the tip of the support column 83. The support column 83 may have a screw hole 831. The fitting column 81 has a column center hole 810. The screw hole 831 communicates with the column center hole 810 and the center line of the column center hole 810 can be the central axis (both are shown as O1). The retaining cap 7 can be screwed onto the opening 201 of the container body 20 via the screw hole 831. The retaining rod 2 can reach the inside of the container body 20 by sequentially passing through the opening 201 surrounded by the column center hole 810 of the fitting column 81 and the screw hole 831 of the retaining cap 7. the above cap The assembly has a simple structure, is compact, easy to produce, has low manufacturing costs, and can easily achieve positional retention of the retaining rod and flexible switching of the retainer. As an example, as shown in Figure 1A, the head cap 6 can be pre-pressed to the bottom together with the retaining rod 2 and the internal component 1. The state shown in Figure 1A can be the initial packaging state of the container 100. At this time, the projection 822 of the head cap 6 can be fitted into the recess 812 of the retaining cap 7, and the container 100 can be locked in the initial packaging state. When used by a user, the head cap 6 can be pulled upward until it reaches the state shown in Figure 1B, so that the elastic projection 822 undergoes a certain deformation and disengages from the recess 812. At this time, the head cap 6, the retaining rod 2, and the internal component 1 can all be in their highest position.

[0033] Next, the head cap 6 can be rotated together with the retaining rod 2 and the internal component 1, as can be seen in Figures 5A, 5B to 5C. During this rotation, the slider 131 of the internal component 1 is rotated from the tip of the vertical chute 331 to the circumferential chute 332 so that it hangs down, and can be locked between the side wall of the circumferential chute 332 and the projection 3321 of the circumferential chute 332, thereby locking the internal component 1 in this highest position. After this rotation, the head cap 6 and the retaining rod 2 can be rotated relative to the retaining cap 7 and the container body 20 to the position of the corresponding retraction space S6 of the projection 822 of the head cap 6. After locking the internal component 1 in its highest position, the projection 822 of the head cap 6 is located above the retraction space S6, allowing the head cap 6 and the retaining rod 2 to be freely pressed up and down against the retaining cap 7 and the container body 20.

[0034] Although the present invention has been disclosed in preferred embodiments as described above, those skilled in the art can make possible changes and modifications without departing from the spirit and scope of the invention, not to limit the invention. Accordingly, any modifications, equivalent changes and modifications made to the above embodiments insofar as they do not depart from the technical concept of the invention and based on the technical substance of the invention fall within the scope of protection set forth in the claims of the present invention.

Claims

1. A pump assembly suitable for attachment to a container body, comprising a retaining rod having a rod body, a connecting bottom wall, a connecting side wall, and a piston, wherein the lower end of the rod body is connected to the connecting bottom wall, and the connecting side wall protrudes upward from the connecting bottom wall and is installed on the outer circumference of the rod body, wherein the pump assembly further comprises a main housing and internal components, The main housing comprises a bottom housing, an inner cylinder housing, and an outer cylinder housing, both of which protrude upward from the bottom housing, the inner cylinder housing encloses a cylindrical cavity, the outer cylinder housing is located on the outer circumference of the inner cylinder housing and defines an annular space between it and the inner cylinder housing, and the bottom housing has a pump suction port in the intermediate portion enclosed by the inner cylinder housing that communicates with the container body. The internal component has a apical shell wall, an inner cylinder wall, and an outer cylinder wall, both of which protrude downward from the apical shell wall, the inner cylinder wall surrounds a through hole through which the rod body passes, and the outer cylinder wall is located on the outer circumference of the inner cylinder wall and defines an annular cavity between it and the inner cylinder wall. The bottom wall of the connecting portion is provided in the cylindrical cavity, the side wall of the connecting portion is in slidable sealing contact with the inner wall surface of the inner cylinder housing, and the piston portion is provided in the annular cavity, and is in slidable sealing contact with the outer wall surface of the inner cylinder wall and the inner wall surface of the outer cylinder wall, respectively. The pump assembly is characterized in that the internal component is provided in the outer cylinder housing so as to be movable from a low position to a high position, and in the low position, the outer cylinder wall of the internal component is at least partially located within the annular space, and in the high position, the internal component is provided so as to be lockable in the high position by a locking structure.

2. The pump assembly according to claim 1, characterized in that the outer cylinder wall and the outer cylinder housing are slidably fitted together by the sliding of a slider on a vertical chute, and the slider and the vertical chute are provided on the first and second sides of the outer wall surface of the outer cylinder wall and the inner wall surface of the outer cylinder housing, respectively.

3. The pump assembly according to claim 2, wherein a circumferential chute is provided on the second side, the circumferential chute is in communication with the longitudinal chute, and at the high position, the internal member is locked at the high position by the slider sliding along the circumferential direction within the circumferential chute, and the slider and the circumferential chute constitute the locking structure.

4. The pump assembly according to claim 3, characterized in that the circumferential chute is provided with a projection having a surface that gradually increases in height from the proximal side to the distal side of the longitudinal chute in the circumferential direction.

5. The pump assembly according to claim 1, characterized in that a vertically extending protrusion is provided on the first of the inner wall surface of the inner cylinder wall and the outer circumferential surface of the rod body, and a groove that slides and fits with the protrusion is provided on the second of the inner wall surface of the inner cylinder wall and the outer circumferential surface of the rod body.

6. The pump assembly according to claim 2, characterized in that the first method is the outer wall surface of the outer cylinder wall.

7. The pump assembly according to claim 2, characterized in that the pump assembly has a plurality of sliders distributed in the circumferential direction and a plurality of corresponding longitudinal chutes.

8. The pump assembly is in the state where the internal component is in the lower position. The bottom wall of the connecting portion of the retaining rod abuts against the bottom housing of the main housing, and there is a vertical gap between the lower end of the outer cylindrical wall of the internal member and the bottom housing, and / or The piston portion of the retaining rod abuts against the top shell wall of the internal component and is located above the inner cylinder housing of the main housing. The pump assembly according to claim 1, characterized in that it is provided to allow the following.

9. The pump assembly is in the state where the internal component is in the high position. The retaining rod moves downward against the internal component until it contacts the bottom housing of the main housing, and the piston portion always makes sealing contact with the outer wall surface of the inner cylinder wall and the inner wall surface of the outer cylinder wall, and / or, The height difference between the lower ends of the inner and outer walls of the internal component and the upper end of the inner housing of the main housing is less than 10% of the height of the outer housing. The pump assembly according to claim 1, characterized in that it is provided to allow the following.

10. A container having a function for discharging contents and comprising a container body, wherein the container further comprises a pump assembly according to any one of claims 1 to 9, and the pump assembly is attached to the container body and discharges the contents inside the container body.

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