A dual chamber vacuum pump

Abstract

The utility model discloses a double -cabin vacuum pump, including big cylinder, small cylinder, cover, bottom cover, fixed sleeve body, big piston, first bin and second bin, be equipped with the piston cover in big piston, and the piston cover has the first position with big piston inner wall formation sealed cooperation and the second position with big piston inner wall formation gap, and big piston inside is equipped with the medium piston who is connected with the piston cover, and the medium piston bottom is equipped with the sealed portion with big piston inner wall sliding sealed cooperation, and the fixed sleeve body inside is equipped with the curve guide structure, and the fixed sleeve body inside is equipped with the movable push rod, and movable push rod outer wall is equipped with the drive portion with the curve guide structure cooperation, and movable push rod one end is connected with bottom cover and is driven its rotation by bottom cover, and movable push rod other end is connected with the bottom of medium piston, and the fixed sleeve body keeps stationary, and the rotary motion of bottom cover passes through the cooperation of drive portion and curve guide structure, and converts into movable push rod's spiral compound motion. The defect that the existing vacuum pump can not realize two material body mixings has been solved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, and in particular to a dual-chamber vacuum pump. Background Technology

[0002] Chinese utility model patent CN204453357U discloses a cosmetic syringe. This syringe pumps out a measured amount of lotion or similar liquid from a bottle through a pressing operation, and automatically draws in air to maintain pressure balance when the press is released. It can precisely control the amount of liquid pumped each time, avoiding contamination and waste. However, after prolonged use, it was found that when mixing two skincare products, squeezing the caps separately onto the hands and then mixing them by rubbing the hands together resulted in uneven mixing and wasted product. Utility Model Content

[0003] To address the shortcomings of the existing technology, this utility model provides a dual-chamber vacuum pump to solve the problem that existing vacuum pumps cannot mix two skincare products.

[0004] This utility model is achieved using the following technical solution:

[0005] A dual-chamber vacuum pump includes a large cylinder, a small cylinder disposed inside the large cylinder, and an outer casing disposed around the large cylinder. It also includes a bottom cover disposed at the bottom of the large cylinder, the bottom cover being rotatable about its own axis. A large piston, which is sealed to the inner side of the large cylinder near the bottom cover, is provided. The large piston has an upper port and a lower port that pass through it vertically. A piston is disposed inside the upper port of the large piston. The piston cover has a first position that forms a sealing fit with the inner wall of the large piston and a second position that forms a gap with the inner wall of the large piston. A middle piston is coaxially disposed inside the large piston. The top of the middle piston is connected to the piston cover, and the bottom of the middle piston has a sealing part that slides and seals with the inner wall of the large piston. The piston cover and the piston cover... The sealing part and the inner wall of the large piston form a second hopper, and the piston cover, the small cylinder and the inner wall of the large cylinder form a first hopper. A fixed sleeve is provided inside the large cylinder. A curved guide structure is provided inside the fixed sleeve. A movable push rod is provided inside the fixed sleeve. The outer wall of the movable push rod is provided with a driving part that cooperates with the curved guide structure. One end of the movable push rod is connected to the bottom cover and is driven to rotate by the bottom cover. The other end of the movable push rod is connected to the bottom of the middle piston. The fixed sleeve remains stationary. The rotational motion of the bottom cover is converted into a helical compound motion of the movable push rod through the cooperation of the driving part and the curved guide structure, so as to drive the middle piston to move back and forth along the axial direction through the movable push rod.

[0006] Furthermore, the curve guiding structure is a spiral groove or a spiral guide rail.

[0007] Furthermore, the driving part is a protrusion or a slider.

[0008] Furthermore, the axial displacement direction of the helical compound motion is determined by the rotation direction of the curved guide structure. Furthermore, the inner wall of the large piston near the upper port has an upwardly expanding conical slope. When the piston cover is in the second position, the outer wall of the piston cover and the conical slope are in a non-contact state, thereby connecting the first and second hoppers.

[0009] Furthermore, when the piston cover is in the first position, the outer wall of the piston cover and the inner wall of the large piston are in close contact with each other and form a sealed contact state, so that the first hopper and the second hopper are not connected to each other.

[0010] Furthermore, the middle piston includes a rod portion coaxially disposed inside the large piston. The top of the rod portion is detachably connected to the piston cover. The bottom of the rod portion is integrally formed with the sealing portion. The bottom of the sealing portion is provided with an axially extending connecting portion. The connecting portion passes through the lower port and is connected to the other end of the movable push rod.

[0011] Furthermore, the bottom of the piston cover is provided with an insertion interface, and the top of the rod is provided with a plug-in post that mates with the insertion interface.

[0012] Furthermore, the bottom surface of the bottom cover extends axially with an outer ring and an inner post (192) located inside the outer ring. The outer ring is inserted into the inside of the fixed sleeve and contacts the inner wall of the fixed sleeve. The movable push rod is provided with a cavity that is inserted and connected to the inner post.

[0013] Furthermore, the outer surface of the bottom cover is provided with a rotation arrow.

[0014] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0015] This invention features a large piston and a piston cover inside a large cylinder, along with a middle piston, forming a first hopper inside the large cylinder and a second hopper inside the large piston, thus providing dual-hopper storage. The bottom cover drives a movable push rod to rotate, and with the design of the curved guide structure and drive unit, the movable push rod drives the axial displacement of the middle piston, which in turn moves the piston cover between a first position and a second position, allowing the first and second hoppers to connect or separate. The material in the two hoppers is mixed through rotation. This design offers advantages such as simple operation, small size, and portability. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a dual-chamber vacuum pump according to Embodiment 1 of this utility model;

[0017] Figure 2 yes Figure 1 A partial schematic diagram of the structure;

[0018] Figure 3 This is a schematic diagram of the structure of a dual-chamber vacuum pump according to Embodiment 1 of this utility model;

[0019] Figure 4 This is a top view of a dual-chamber vacuum pump according to Embodiment 1 of this utility model;

[0020] In the diagram: 1. Outer cover; 2. Needle cap; 3. Outer jacket; 4. Piston rod seat; 5. Piston rod; 6. Spring; 7. Middle cover; 8. Piston seat; 9. Locking cover; 10. Small piston; 11. Small cylinder; 12. Valve; 13. Large cylinder; 14. Large piston; 141. Conical inclined surface; 15. Piston cover; 16. Middle piston; 161. Rod part; 162. Connecting part; 163. Sealing part; 17. Fixed sleeve; 171. Curved guide structure; 18. Movable push rod; 181. Drive part; 182. Cavity; 19. Bottom cover; 191. Outer ring; 192. Inner column; 193. Rotating arrow; 20. First hopper; 21. Second hopper. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0022] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0023] like Figures 1 to 4As shown, this utility model provides a dual-chamber vacuum pump, including a large cylinder 13, a small cylinder 11 disposed inside the large cylinder 13, and an outer casing 3 disposed around the large cylinder 13. It also includes a bottom cover 19 disposed at the bottom of the large cylinder 13, the bottom cover 19 being rotatable about its own axis. A large piston 14 is disposed on the inner side of the large cylinder 13 near the bottom cover 19, and is sealed to it. The large piston 14 has an upper port and a lower port that pass through it vertically. A piston cover 15 is disposed on the inner side of the upper port of the large piston 14. The piston cover 15 has a first position that forms a sealed fit with the inner wall of the large piston 14 and a second position that forms a gap with the inner wall of the large piston 14. A middle piston 16 is coaxially disposed inside the large piston 14. The top of the middle piston 16 is connected to the piston cover 15, and the bottom of the middle piston 16 has a sealing part 163 that slides and seals with the inner wall of the large piston 14. The piston cover 15 and the sealing part... The piston 163 and the inner wall of the large piston 14 form a second hopper 21. The piston cover 15, the small cylinder 11 and the inner wall of the large cylinder 13 form a first hopper 20. The large cylinder 13 is provided with a fixed sleeve 17. The fixed sleeve 17 is provided with a curved guide structure 171 inside. The fixed sleeve 17 is provided with a movable push rod 18 inside. The outer wall of the movable push rod 18 is provided with a driving part 181 that cooperates with the curved guide structure 171. One end of the movable push rod 18 is connected to the bottom cover 19 and is driven to rotate by the bottom cover 19. The other end of the movable push rod 18 passes through the lower port and is connected to the bottom of the middle piston 16. The fixed sleeve 17 remains stationary. The rotational motion of the bottom cover 19 is converted into a helical compound motion of the movable push rod 18 through the cooperation of the driving part 181 and the curved guide structure 171, so as to drive the middle piston 16 to move back and forth along the axial direction through the movable push rod 18.

[0024] In this embodiment, the first hopper 20 and the second hopper 21 are pre-filled with two different materials. When it is necessary to mix the two materials, the bottom cover 19 is rotated, and the bottom cover 19 drives the movable push rod 18 to rotate. Since the fixed sleeve 17 is fixed, the curved guide structure 171 will constrain the movement of the movable push rod 18, so that the movable push rod 18 generates axial displacement while rotating. That is, the movement of the movable push rod 18 is a combination of "rotational motion" and "axial linear motion", which is called spiral compound motion. In this way, the axial displacement of the movable push rod 18 drives the axial displacement of the middle piston 16. When the piston cover 15 moves to the second position, a gap is formed between the outer wall of the piston cover 15 and the inner wall of the large piston 14, so that the materials in the first hopper 20 and the second hopper 21 can flow through the gap, thereby realizing the mixing of the materials in the two hoppers. After the mixing is completed, the bottom cover 19 is rotated in the opposite direction to move the piston cover 15 from the second position to the first position, so that the piston cover 15 and the large piston 14 form a sealing fit, blocking the flow of materials between the two hoppers.

[0025] It should be noted that in this embodiment, a locking cover 9 is provided on the top of the large cylinder 13, a piston rod seat 4 is provided on the inner side of the outer sleeve 3, a middle cover 7 is provided on the upper edge of the locking cover 9, a piston rod 5 is provided at the top of the piston rod seat 4, a piston seat 8 is provided at the middle cover 7, the piston seat 8 is clamped inside the piston rod 5, and springs 6 are provided on both sides of the piston rod 5 from the top of the piston rod seat 4 to the middle cover 7. A small piston 10 is provided in both the piston seat 8 and the piston rod 5. A small cylinder 11 is provided at the lower edge of the middle cover 7 and the periphery of the piston seat 8, and a valve 12 is provided at the lower end of the small cylinder 11. After mixing, the outer cover 1 at the top of the outer sleeve 3 is opened, the bottom cover 19 is pressed, and the large cylinder 13 is moved axially, so that the spring 6 is compressed. The small piston 10 is rubbed by the inner wall of the small cylinder 11, so that the gap between the small piston 10 and the piston seat 8 is opened, and the material is discharged from the hole of the piston seat 8. The valve 12 is tightly sealed in the small cylinder 11 by the pressure of the material, ensuring the amount of material ejected from the needle cap 2. When the pressing is completed and the spring is in the rebound phase, the small piston 10 is rubbed by the small cylinder 11. The small piston 10 and the piston seat 8 are quickly sealed to ensure that the internal liquid does not come into contact with the outside air. The valve 12 is opened by the vacuum force of the small cylinder 11, and the material in the second hopper 21 is introduced into the small cylinder 11.

[0026] This invention features a large piston 14 and a piston cover 15 that cooperate with the large piston 14 inside the large cylinder 13, along with a middle piston 16. This creates a first hopper 20 inside the large cylinder 13 and a second hopper 21 inside the large piston 14, thus providing a dual-hopper storage function. The bottom cover 19 drives the movable push rod 18 to rotate. With the design of the curved guide structure 171 and the drive unit 181, the movable push rod 18 drives the middle piston 16 to move axially, which in turn drives the piston cover 15 to move between the first and second positions. This allows the first hopper 20 and the second hopper 21 to be connected or separated. The material in the two hoppers is mixed by rotation. This invention has the advantages of simple operation, small size, and portability.

[0027] In a preferred embodiment, the curved guide structure 171 is a spiral groove or a spiral guide rail. In this embodiment, when the fixed sleeve 17 and the movable push rod 18 are assembled together, the drive part 181 will be embedded in the spiral groove to form a sliding or rolling fit. When the bottom cover 19 drives the movable push rod 18 to rotate, the drive part 181 of the movable push rod 18 is forced to move along the path of the spiral groove, causing the movable push rod 18 to generate axial (linear) displacement while rotating. In a preferred embodiment, the drive part 181 is a protrusion or a slider. In a preferred embodiment, the axial displacement direction of the spiral compound motion is determined by the rotation direction of the curved guide structure 171.

[0028] In this embodiment, when the spiral groove is right-handed, when the movable push rod 18 is rotated clockwise by the bottom cover 19, the movable push rod 18 will move axially away from the bottom cover 19, that is, the piston cover 15 will move from the first position to the second position. When the movable push rod 18 is rotated counterclockwise by the bottom cover 19, the movable push rod 18 will move axially towards the bottom cover 19, that is, it will drive the piston cover 15 to move from the second position to the first position. If the spiral groove is left-handed, the direction is reversed. Of course, in other ways, the rotation direction of the bottom cover 19 can be selected according to the actual situation.

[0029] In a preferred embodiment, the inner wall of the large piston 14 near the upper port is formed with an upwardly expanding conical slope 141. When the piston cover 15 is in the second position, the outer wall of the piston cover 15 and the conical slope 141 are in a non-contact state, so that the first hopper 20 and the second hopper 21 are connected.

[0030] In this embodiment, by setting the conical inclined surface 141, when the piston cover 15 moves to the second position, the outer wall of the piston cover 15 does not contact the conical inclined surface 141, so that a gap is formed between the piston cover 15 and the large piston 14, and the material in the first hopper 20 and the second hopper 21 can flow to each other through the gap to achieve a mixing effect; the conical inclined surface 141 gradually expands upward along the axial direction, so that the channel between the first hopper 20 and the second hopper 21 gradually expands, thereby increasing the mixing speed of the material in the two hoppers.

[0031] In a preferred embodiment, when the piston cover 15 is in the first position, the outer wall of the piston cover 15 and the inner wall of the large piston 14 are in close contact with each other and form a sealed contact state, so that the first hopper 20 and the second hopper 21 are not connected to each other.

[0032] In this embodiment, during actual use, when the piston cover 15 is in the first position, the outer wall of the piston cover 15 and the inner wall of the large piston 14 are in close contact with each other and form a sealed contact state. Under this sealed contact state, the medium in the two hoppers cannot flow to each other. When the piston cover 15 is in the second position, the outer wall of the piston cover 15 and the conical inclined surface 141 form a non-contact state, and a gap is formed between the piston cover 15 and the large piston 14. The medium in the two hoppers can flow to each other through the gap, so that the materials in the two hoppers can be mixed together.

[0033] In a preferred embodiment, the middle piston 16 includes a rod 161 coaxially disposed inside the large piston 14. The top of the rod 161 is detachably connected to the piston cover 15, and the bottom of the rod 161 is integrally formed with the sealing part 163. The bottom of the sealing part 163 is provided with an axially extending connecting part 162, which passes through the lower port and connects to the other end of the movable push rod 18.

[0034] In a preferred embodiment, the piston cover 15 has a plug-in interface at its bottom, and the rod portion 161 has a plug-in post at its top that mates with the plug-in interface. In this embodiment, the piston cover 15 and the rod portion 161 of the middle piston 16 are connected by a plug-in connection, which has the advantages of simple structure and convenient assembly. Of course, in other embodiments, the piston cover 15 and the middle piston 16 can also be connected using other detachable methods, such as a snap-fit ​​connection.

[0035] In a preferred embodiment, the bottom surface of the bottom cover 19 extends axially with an outer ring 191 and an inner post 192 located inside the outer ring 191. The outer ring 191 is inserted into the fixed sleeve 17 and contacts the inner wall of the fixed sleeve 17. The movable push rod 18 is provided with a cavity 182 that is inserted and connected to the inner post 192.

[0036] In this embodiment, the outer ring contacts the inner wall of the fixed sleeve 17 191, which guides the rotation of the bottom cover 19. The bottom cover 19 is connected to the movable push rod 18 through the inner column 192. The bottom cover 19 drives the movable push rod 18 to rotate synchronously. At the same time, the cooperation between the inner column 192 and the cavity 182 allows the movable push rod 18 to also move axially relative to the bottom cover 19.

[0037] In a preferred embodiment, the outer surface of the bottom cover 19 is provided with a rotation arrow 193. The rotation arrow 193 is provided to easily indicate to the operator which direction to rotate the bottom cover 19, thereby enhancing the user experience.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A dual-chamber vacuum pump, comprising a large chamber (13), a small chamber (11) disposed inside the large chamber (13), and an outer casing (3) disposed around the large chamber (13); characterized in that, It also includes a bottom cover (19) located at the bottom of the large cylinder (13), the bottom cover (19) being configured to rotate about its own axis. A large piston (14) is provided on the inner side of the large cylinder (13) near the bottom cover (19) and is sealed to it. The large piston (14) has an upper port and a lower port that are vertically connected. A piston cover (15) is provided on the inner side of the upper port of the large piston (14). The piston cover (15) has a first position that forms a sealed fit with the inner wall of the large piston (14) and a second position that forms a gap with the inner wall of the large piston (14). A middle piston (16) is coaxially provided inside the large piston (14). The top of the middle piston (16) is connected to the piston cover (15). The bottom of the middle piston (16) is provided with a sealing part (163) that slides and seals with the inner wall of the large piston (14). The piston cover (15), the sealing part (163), and the inner wall of the large piston (14) constitute a second hopper (21). 15) The inner walls of the small cylinder (11) and the large cylinder (13) form the first hopper (20). The large cylinder (13) is provided with a fixed sleeve (17). The fixed sleeve (17) is provided with a curved guide structure (171) inside. The fixed sleeve (17) is provided with a movable push rod (18). The outer wall of the movable push rod (18) is provided with a drive part (181) that cooperates with the curved guide structure (171). One end of the movable push rod (18) is connected to the bottom cover. (19) is connected and driven to rotate by the bottom cover (19). The other end of the movable push rod (18) is connected to the bottom of the middle piston (16). The fixed sleeve (17) remains stationary. The rotational motion of the bottom cover (19) is converted into the helical compound motion of the movable push rod (18) through the cooperation of the drive part (181) and the curved guide structure (171), so as to drive the middle piston (16) to move back and forth along the axial direction through the movable push rod (18).

2. The dual-chamber vacuum pump according to claim 1, characterized in that, The curve guide structure (181) is a spiral groove or a spiral guide rail.

3. The dual-chamber vacuum pump according to claim 1, characterized in that, The drive unit (181) is a protrusion or a slider.

4. The dual-chamber vacuum pump according to claim 1, characterized in that, The axial displacement direction of the helical compound motion is determined by the rotation direction of the curve guide structure (171).

5. The dual-chamber vacuum pump according to claim 1, characterized in that, The large piston (14) has an upwardly expanding conical slope (141) formed on the inner wall near the upper port. When the piston cover (15) is in the second position, the outer wall of the piston cover (15) and the conical slope (141) are in a non-contact state, so that the first hopper (20) and the second hopper (21) are connected.

6. The dual-chamber vacuum pump according to claim 1, characterized in that, When the piston cover (15) is in the first position, the outer wall of the piston cover (15) and the inner wall of the large piston (14) are in close contact with each other and form a sealed contact state, so that the first hopper (20) and the second hopper (21) are not connected.

7. The dual-chamber vacuum pump according to claim 1, characterized in that, The middle piston (16) includes a rod (161) coaxially disposed inside the large piston (14). The top of the rod (161) is detachably connected to the piston cover (15). The bottom of the rod (161) is integrally formed with the sealing part (163). The bottom of the sealing part (163) is provided with an axially extending connecting part (162). The connecting part (162) passes through the lower port and is connected to the other end of the movable push rod (18).

8. The dual-chamber vacuum pump according to claim 7, characterized in that, The piston cover (15) has an insertion interface at its bottom, and the rod (161) has an insertion post at its top that mates with the insertion interface.

9. The dual-chamber vacuum pump according to claim 1, characterized in that, The bottom surface of the bottom cover (19) extends axially with an outer ring (191) and an inner post (192) located inside the outer ring (191). The outer ring (191) is inserted into the fixed sleeve (17) and contacts the inner wall of the fixed sleeve (17). The movable push rod (18) is provided with a cavity (182) that is inserted and connected to the inner post (192).

10. The dual-chamber vacuum pump according to claim 1, characterized in that, The outer surface of the bottom cover (19) is provided with a rotating arrow (193).

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