Press pump having hollowed-out cylinder

Abstract

A press pump having a hollowed-out cylinder, the press pump comprising: a press head (10), a cylinder (20), a piston rod (30), a collar (40) and an elastic restoring mechanism (50), wherein the cylinder (20) comprises an upper side portion (21) and a lower side portion (22); an upper end of the piston rod (30) is fixedly connected to the press head (10), and a lower end of the piston rod extends into the cylinder (20) and is slidably and sealingly fitted against an inner wall of the lower side portion (22); the collar (40) is connected to an upper end of the cylinder (20) and is connected to an opening of a container using the press pump (100); the elastic restoring mechanism (50) is sleeved on the outer peripheral side of the piston rod (30), with an upper end being directly or indirectly supported on the piston rod (30), and a lower end being directly or indirectly supported on the cylinder (20); and the upper portion (21) is provided with a hollowed-out portion, and when the press pump (100) is inserted into the container, liquid in the container can enter the upper portion (21) through the hollowed-out portion. The press pump can reduce the amount of liquid discharged.

Description

Press pump with air cylinder Technical Field

[0001] This disclosure relates to a push pump with a hollowed-out air cylinder. Background Technology

[0002] A liquid pump typically consists of a pump head, a toothed sleeve, a cylinder, a piston, a piston rod, a check valve, and a return spring. The pump is fixed to the bottle neck by the toothed sleeve, with most of the cylinder located inside the bottle. The cylinder can be divided into two parts: the upper part and the lower part. The lower part houses the piston movement, while the upper part contains the return spring, piston rod, and other components. When the pump is installed on the bottle, the cylinder occupies a portion of the bottle's internal space; this space determines the pump's discharge capacity. Pumps with higher discharge volumes require larger cylinders, resulting in a larger discharge volume. A larger discharge volume necessitates a corresponding increase in bottle volume to prevent overflow. Increasing bottle volume also increases the use of plastic materials, leading to resource waste. With growing environmental awareness, reducing the discharge volume of pumps has become a problem that needs to be addressed. Summary of the Invention

[0003] This disclosure addresses the problems existing in the prior art. One objective of this disclosure is to provide a press pump with a hollowed-out air cylinder, which can reduce the discharge volume of the press pump.

[0004] This disclosure provides a press pump with a hollowed-out cylinder, comprising: a press head; a cylinder including an upper portion and a lower portion; a piston rod, the upper end of which is fixedly connected to the press head, and the lower end extending into the cylinder and slidably sealing against the inner wall of the lower portion; a toothed sleeve connected to the upper end of the cylinder and connected to the opening of a container using the press pump; and an elastic reset mechanism sleeved on the outer periphery of the piston rod, the upper end of which is directly or indirectly supported by the piston rod, and the lower end of which is directly or indirectly supported by the cylinder, wherein the upper portion has a hollowed-out portion, and when the press pump is inserted into the container, the liquid in the container can enter the upper portion through the hollowed-out portion.

[0005] According to the press pump with a hollowed-out cylinder disclosed herein, by providing a hollowed-out portion on the upper side of the cylinder, when the press pump is inserted into the container, the liquid in the container can enter the upper side of the cylinder through the hollowed-out portion, thereby reducing the discharge volume of the press pump.

[0006] In the aforementioned press pump with a hollowed-out cylinder, the press pump may also include a cylinder head disposed on the cylinder head, through which a piston rod is inserted and a cylinder head sealing portion is provided. The piston rod has a first piston rod sealing portion. In the standby state, the first piston rod sealing portion and the cylinder head sealing portion cooperate to seal the inside and outside of the container. When the press head is pressed from the standby state or when the press head rebounds, the first piston rod sealing portion separates from the cylinder head sealing portion, forming a balanced air passage that allows air to enter the container from between the piston rod and the cylinder head through the hollowed-out portion when a negative pressure is generated inside the container. According to the above structure, by providing a sealing mechanism (cylinder head sealing portion and piston rod first sealing portion) between the cylinder head and the piston rod, leakage of liquid entering the upper part of the cylinder can be prevented in the standby state.

[0007] Preferably, the inner circumferential surface of the cylinder head includes a beveled portion facing downwards towards the inner circumferential side, which constitutes the cylinder head sealing portion. A first flange is provided on the outer circumferential surface of the piston rod, and the axial side surface of the first flange facing upwards towards the outer circumferential side constitutes the piston rod first sealing portion. According to the above structure, a more reliable seal can be achieved between the piston rod and the cylinder head.

[0008] In the aforementioned push-button pump with a hollowed-out cylinder, a liquid-blocking mechanism may be provided at the upper end of the elastic reset mechanism. This liquid-blocking mechanism has a main body portion sleeved on the outer periphery of the piston rod, and a helical flange on the outer periphery of the piston rod. The main body portion has a groove, which engages with the helical flange to put the push-button pump into or release the locked state. Based on the above structure, a push-button pump with a locking function can be provided.

[0009] Preferably, the main body is provided with a main body sealing part, the piston rod is provided with a piston rod second sealing part, and the press pump further includes a cylinder head disposed on the valve, the cylinder head through which the piston rod is inserted and having a downwardly extending first cylindrical part at its lower end, and the outer periphery of the main body is provided with an upwardly extending second cylindrical part. In the locked state of the press pump, the main body sealing part and the piston rod second sealing part cooperate to seal between the liquid-blocking mechanism and the piston rod, and the lower end of the first cylindrical part and the upper end of the second cylindrical part cooperate to seal between the liquid-blocking mechanism and the cylinder head. According to the above structure, in the locked state, it is possible to prevent the liquid in the container from contacting the upper part of the piston rod, thereby preventing the piston rod from bringing out the liquid when it is opened for use.

[0010] Preferably, the axial surface of the main body portion that is closer to the outer periphery than the groove and faces obliquely upward to the outer periphery constitutes the main body sealing portion. A first flange is provided on the outer periphery of the piston rod, and the axial surface of the first flange that faces obliquely downward to the inner periphery constitutes the piston rod second sealing portion. According to the above structure, a more reliable seal can be achieved between the liquid-blocking mechanism and the piston rod.

[0011] In the aforementioned press pump with a hollowed-out cylinder, the press pump may also include a cylinder head disposed on the cylinder head, through which a piston rod passes. One of the press head and the cylinder head has a third cylindrical portion, and the other has an annular groove. In the locked state of the press pump, the third cylindrical portion engages with the annular groove to seal the inside and outside of the container. According to this structure, by utilizing the press head and cylinder head, which are close to each other in the locked state, the inside and outside of the container can be reliably sealed.

[0012] In the aforementioned press pump with a hollowed-out cylinder, the elastic reset mechanism may be at least partially disposed within the upper portion. This elastic reset mechanism has an arc-shaped elastic strip, which extends partially through the hollowed-out portion to the outside of the cylinder when the press head is pressed from its standby state or when the press head rebounds. Based on this structure, the hollowed-out portion increases the design freedom of the elastic reset mechanism, allowing it to be easily configured as an elastic reset mechanism with the desired elastic force.

[0013] In the aforementioned press pump with a hollowed-out cylinder, the hollowed-out portion may be formed between circumferentially adjacent walls of the upper portion, and the upper portion may also be provided with reinforcing ribs connecting the circumferentially adjacent walls. By providing reinforcing ribs, the reduced strength caused by the hollowed-out portion can be compensated.

[0014] In the aforementioned press pump with a hollowed-out cylinder, the elastic reset mechanism can also be a plastic spring. The hollowed-out portion includes a first hollowed-out portion, which is configured as a longitudinal elongated notch. The plastic spring is provided with a protrusion that can move axially back and forth within the notch. Thus, the hollowed-out portion can reliably prevent or suppress the deflection or twisting of the plastic spring during pressing. Furthermore, since plastic springs are bulky, by providing the aforementioned hollowed-out portion on the cylinder in a press pump where the plastic spring is at least partially located in the upper part of the cylinder, an excellent effect of reducing the discharge volume can be achieved. Attached Figure Description

[0015] Figure 1 shows a perspective view of a push-button pump according to a first embodiment of the present disclosure, illustrating the lock state of the push-button pump.

[0016] Figure 2 shows a cross-sectional view of the push pump according to the first embodiment of the present disclosure, showing the lock state of the push pump.

[0017] Figure 3a shows an enlarged view of part A in Figure 2.

[0018] Figure 3b shows an enlarged view of part B in Figure 2.

[0019] Figure 3c shows an enlarged view of part C in Figure 2.

[0020] Figure 4 shows a cross-sectional view of a push-button pump according to a first embodiment of the present disclosure, illustrating the push-button pump in its ready-to-use state.

[0021] Figure 5 shows an enlarged view of part D in Figure 4.

[0022] Figure 6 shows a perspective view of the cylinder of the press pump according to the first embodiment of this disclosure.

[0023] Figure 7 shows a perspective view of a portion of the piston rod and the liquid-blocking mechanism of the press pump according to the first embodiment of this disclosure.

[0024] Figure 8 shows a cross-sectional view of a portion of the piston rod and the liquid-blocking mechanism of the press pump according to the first embodiment of the present disclosure.

[0025] Figure 9 shows an exploded perspective view of a portion of the piston rod and the liquid-blocking mechanism of the press pump according to the first embodiment of the present disclosure.

[0026] Figure 10 shows a perspective view of the liquid-blocking mechanism of the press pump according to the first embodiment of the present disclosure.

[0027] Figure 11 shows a perspective view of a push-button pump according to a second embodiment of the present disclosure, illustrating the lock state of the push-button pump.

[0028] Figure 12 shows a perspective view of the cylinder of the press pump according to the second embodiment of the present disclosure.

[0029] (Symbol Explanation) 10 Press Head 11 Third Cylinder Section 20, 220 Cylinder 21, 221 Upper Section 22 Lower Section 30 Piston Rod 31 First Flange 32 Helical Flange 40 Toothed Cuff 50 Elastic Reset Mechanism 52 Elastic Strip 53 Protrusion 80 Liquid Resistance Mechanism 81 Main Body Section 82 Second Cylinder Section 90 Cylinder Head 91 Cylinder Head Sealing Section 92 First Cylinder Section 93 Annular Groove 100, 200 Press Pump 311 Piston Rod First Sealing Section 312 Piston Rod Second Sealing Section 811 Groove 812 Main Body Sealing Section 2214 Reinforcing Rib L Hollowed-out Section L1 First Hollowed-out Section Detailed Implementation

[0030] To facilitate understanding of this disclosure, the specific embodiments of the press pump of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments shown in the drawings are merely preferred embodiments of this disclosure and should not be construed as limiting the scope of this disclosure. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to this disclosure based on the embodiments shown in the drawings, and, without contradiction, the technical features of the different embodiments described below can be arbitrarily combined with each other, all of which fall within the scope of this disclosure.

[0031] Hereinafter, the direction parallel to the central axis of the piston rod will be referred to as the "axial direction". The circumferential direction centered on the central axis of the piston rod will be simply referred to as the "circumferential direction". In the following detailed description of this disclosure, terms such as "upper", "lower", "inner", and "outer" used to indicate direction and orientation are based on the orientation of the press pump as shown in the accompanying drawings when in use. It is understood that the orientation of the press pump may change in situations such as transportation and storage.

[0032] <First Embodiment>

[0033] Figure 1 shows a perspective view of the press pump 100 according to the first embodiment of this disclosure, showing the press pump in its locked state. Figure 2 shows a cross-sectional view of the press pump 100, showing the press pump in its locked state. Figures 3a, 3b, and 3c show enlarged views of part A, part B, and part C of Figure 2, respectively. Figure 4 shows a cross-sectional view of the press pump 100, showing the press pump in its ready-to-use state. Figure 5 shows an enlarged view of part D of Figure 4. Figure 6 shows a perspective view of the cylinder 20 of the press pump 100. Figure 7 shows a perspective view of the upper part of the piston rod 30 and the liquid-blocking mechanism 80 of the press pump 100. Figure 8 shows a cross-sectional view of the upper part of the piston rod 30 and the liquid-blocking mechanism 80 of the press pump 100. Figure 9 shows an exploded perspective view of the upper part of the piston rod 30 and the liquid-blocking mechanism 80 of the press pump 100. Figure 10 shows a perspective view of the liquid-blocking mechanism 80 of the press pump 100.

[0034] The press pump 100 includes a press head 10, a cylinder 20, a piston rod 30, a toothed sleeve 40, and a resilient reset mechanism 50. The toothed sleeve 40 is connected to the upper end of the cylinder 20 and to the opening of a container (not shown) such as a bottle using the press pump 100. The cylinder 20 is, for example, a single integrally formed component. At least a portion of the cylinder 20 is disposed within the container below the container opening.

[0035] The cylinder 20 includes: an upper portion 21 for housing components such as the piston rod 30 and the elastic return mechanism 50; a lower portion 22 located below and smaller in diameter than the upper portion 21, the lower portion 22 being configured as the area for piston reciprocating motion; and a stepped portion 23 between the upper and lower portions. A cylindrical cylinder plug 60 is installed inside the cylinder 20. The cylinder plug 60 is located above the piston 33 described below. For example, the cylinder plug 60 can be fixed in the cylinder 20 by a flange-groove structure or other methods known in the art. The cylinder plug 60 is mounted on the stepped portion 23 and is inserted through by the piston rod 30. In addition, a lower one-way valve 70 is installed at the lower end of the interior of the cylinder 20.

[0036] The upper end of the piston rod 30 is fixedly connected to the pressure head 10. The piston rod 30 has an internal passage communicating with the internal passage of the pressure head 10. In this embodiment, the piston rod 30 has separate and fixed upper and lower parts. However, it is not limited to this; the piston rod can also be a single integrally formed component. The lower end of the piston rod 30 extends into the cylinder 20 and is slidably and sealingly fitted onto the inner wall of the lower portion 22. More specifically, the lower end of the piston rod 30 is provided with a piston 33, which is slidably and sealingly fitted onto the inner wall of the lower portion 22.

[0037] The elastic reset mechanism 50 is at least partially disposed within the upper portion 21. The elastic reset mechanism 50 is sleeved on the outer periphery of the piston rod 30. The elastic reset mechanism 50 may be a plastic spring. In this embodiment, the elastic reset mechanism 50 has a multi-layered structure and is made of plastic, for example, it may be made of the same plastic material as other parts of the press pump 100. For example, the elastic reset mechanism 50 has an elastic reset mechanism body that is housed inside the upper portion 21 of the cylinder 20 when not pressed. The elastic reset mechanism body includes an upper ring, a lower ring, and a middle ring 51, with at least one arcuate elastic strip 52 disposed between the upper ring and the middle ring 51 and between the lower ring and the middle ring 51, preferably two or more elastic strips 52. Furthermore, the elastic reset mechanism 50 may also employ other structures known in the art, for example, it may be a metal spring.

[0038] The upper end of the elastic reset mechanism 50 is directly or indirectly supported by the piston rod 30. In this embodiment, a liquid-blocking mechanism 80 is provided at the upper end of the elastic reset mechanism 50. The elastic reset mechanism 50 is supported by the piston rod 30 via the liquid-blocking mechanism 80. Furthermore, the lower end of the elastic reset mechanism 50 is directly or indirectly supported by the cylinder 20. More specifically, the lower end of the elastic reset mechanism 50 is supported on the cylinder piston 60 (the lower end of the elastic reset mechanism 50 is supported by the cylinder piston 60 on the cylinder 20). Alternatively, the cylinder piston can be omitted, allowing the lower end of the elastic reset mechanism 50 to be directly supported by the cylinder 20.

[0039] A perforated portion L is provided in the upper portion 21 (the portion above the piston movement range) of the cylinder 20. When the press pump 100 is inserted into the container, the liquid in the container can enter the upper portion 21 through the perforated portion L. This reduces the discharge volume of the press pump. The perforated portion L can be one or more. In this embodiment, the cylinder 20 has a plurality of (e.g., four) walls 211, 212, 213, 214 (see Figure 6) arranged circumferentially spaced apart and extending axially, and an annular portion 215 connecting the plurality of walls 211, 212, 213, 214 is provided above the plurality of walls 211, 212, 213, 214. The perforated portion L is formed between circumferentially adjacent walls among the plurality of walls 211, 212, 213, 214. That is, the perforated portion L is formed between circumferentially adjacent walls of the upper portion 21. In addition, the plurality of walls may also extend in a direction inclined relative to the axial direction.

[0040] In the example shown in Figure 6, the cutout portion L includes a first cutout portion L1 and a second cutout portion L2. Multiple first cutout portions L1 and second cutout portions L2 are alternately arranged in the circumferential direction. For example, two first cutout portions L1 are provided at 180° intervals. The two first cutout portions L1 are located between wall portions 211 and 212, and between wall portions 213 and 214, respectively. For example, two second cutout portions L2 are provided at 180° intervals. The second cutout portions L2 are located between wall portions 212 and 213, and between wall portions 214 and 211, respectively.

[0041] The first hollow portion L1 is configured as a longitudinal elongated notch. A protrusion 53 may be provided at least at one of the upper, middle, or lower portions of the plastic spring serving as the elastic reset mechanism 50. The protrusion 53 can reciprocate axially within the notch of the first hollow portion L1. This prevents or suppresses the plastic spring from deflecting or twisting during pressing. In the example shown in Figure 2, the protrusion 53 extends axially downwards and outwards from the middle ring 51 of the elastic reset mechanism body. Alternatively, the protrusion 53 may be provided at other axial locations on the plastic spring.

[0042] The circumferential width of the second hollow portion L2 is larger than that of the first hollow portion L1. When the pressure head 10 is pressed from the ready-to-use state or when the pressure head 10 rebounds, the elastic strip 52 in the compressed state can partially extend to the outside of the cylinder 20 through the first hollow portion L1.

[0043] A liquid-blocking mechanism 80 is provided at the upper end of the elastic reset mechanism 50. The liquid-blocking mechanism 80 is at least partially disposed within the upper portion 21. The liquid-blocking mechanism 80 has a main body portion 81 sleeved on the outer periphery of the piston rod 30. The main body portion 81 is housed inside the upper portion 21 of the cylinder 20.

[0044] As shown in Figures 2, 4, and 7, the outer circumferential surface of the piston rod 30 is provided with a helical flange 32. For example, two helical flanges 32 are provided.

[0045] The main body 81 has a groove 811 on its inner circumferential surface corresponding to the helical flange 32. The groove 811 engages with the helical flange 32 to put the press pump 100 into a locked state (see Figure 2) or release it from the locked state. Figure 4 shows an example of release from the locked state. In the ready-to-use state shown in Figure 4, the lower end of the helical flange 32, for example, disengages from the groove 811, and under the action of the elastic reset mechanism 50, the main body 81 is pushed upward, thereby abutting the lower end of the helical flange 32 against the axial side surface of the main body 81.

[0046] The press pump 100 also includes a cylinder head 90 disposed on the cylinder sleeve 40, through which the piston rod 30 passes. The cylinder head 90 is connected to the cylinder sleeve 40 and mounted on the cylinder 20.

[0047] In the structures shown in Figures 2 and 4, the cylinder head 90 and the cylinder sleeve 40 are two separate components. Those skilled in the art will understand that a structure in which the cylinder sleeve and cylinder head are integrally formed (the cylinder head and cylinder sleeve are integrally formed) is also common in the art.

[0048] The cylinder head 90 is provided with a cylinder head sealing part 91. The piston rod 30 is provided with a piston rod first sealing part 311. In the standby state, the piston rod first sealing part 311 and the cylinder head sealing part 91 cooperate to seal the inside and outside of the container (seal the balance air passage described below).

[0049] In this embodiment, the cylinder head seal 91 is a portion of the inner circumferential surface of the cylinder head 90. The inner circumferential surface of the cylinder head 90 includes a sloped portion facing downward toward the inner circumferential side, which is located at the lower part of the inner circumferential surface of the cylinder head 90 and constitutes the cylinder head seal 91. At least a portion of the cylinder head seal 91 is tapered, facing downward toward the inner circumferential side. Furthermore, when the cylinder head and piston rod are integrally formed, the cylinder head seal that mates with the piston rod first seal 311 is located on the inner circumferential surface of the piston rod.

[0050] A first flange 31 is provided on the outer peripheral surface of the piston rod 30. The first flange 31 is located above the helical flange 32. The first flange 31 has a shape that extends outward from the outer peripheral surface of the piston rod 30 and then extends obliquely downward to the outer peripheral side. The first flange 31 is formed throughout the entire circumference.

[0051] The piston rod first sealing portion 311 is a part of the axial side surface of the first flange 31. The portion of the axial side surface of the first flange 31 that faces obliquely upward toward the outer periphery constitutes the piston rod first sealing portion 311. That is, the axial side surface of the first flange 31 that faces obliquely upward toward the outer periphery constitutes the piston rod first sealing portion 311. Corresponding to the cylinder head sealing portion 91, at least a portion of the piston rod first sealing portion 311 is tapered, facing obliquely upward toward the outer periphery. In this embodiment, the piston rod first sealing portion 311 is located on the outer periphery side of the axial side surface of the first flange 31.

[0052] In one example, both the cylinder head 90 and the piston rod 30 are made of plastic, and there can be a certain amount of interference between the cylinder head 90 and the piston rod 30 when they are fitted together to seal, thereby achieving a more reliable seal.

[0053] When the pressure head 10 is pressed from the standby state, the first sealing part 311 of the piston rod separates from the cylinder head sealing part 91, forming a balance air passage that allows air to enter the container through the perforation L from between the piston rod 30 and the cylinder head 90 when a negative pressure is generated inside the container. The balance air passage connects the space inside and outside the container. Furthermore, the balance air passage is also formed during the rebound of the pressure head 10.

[0054] Furthermore, in the standby state, for example, the piston rod 30 is restricted from moving upward by abutting against the first flange 31 via a stop on the cylinder head 90.

[0055] Furthermore, the press pump 100 is equipped with a first sealing mechanism, which seals the aforementioned balance air passage when the press pump 100 is in the locked state. In this embodiment, the first sealing mechanism is disposed between the press head 10 and the cylinder head 90.

[0056] A third cylindrical portion 11 extending downward may be provided in the pressure head 10. An annular groove 93 may be provided recessed downward in the cylinder head 90. In the locked state of the press pump 100, the third cylindrical portion 11 engages with the annular groove 93, specifically, the third cylindrical portion 11 is inserted into the annular groove 93 to seal the inside and outside of the container. At this time, the inner or outer circumferential surface of the third cylindrical portion 11 can be in close contact with the wall surface of the annular groove 93. The third cylindrical portion 11 and the annular groove 93 constitute a first sealing mechanism. Furthermore, when released from the locked state, the third cylindrical portion 11 and the annular groove 93 separate. Alternatively, instead of the aforementioned third cylindrical portion 11 and annular groove 93, an annular groove may be provided recessed upward in the pressure head 10, and a third cylindrical portion extending upward in the cylinder head 90 may be provided.

[0057] The press pump 100 is also provided with a second sealing mechanism, which seals the aforementioned balance air passage when the press pump 100 is in standby mode. In this embodiment, the second sealing mechanism is disposed between the piston rod 30 and the cylinder head 90. The aforementioned piston rod first sealing part 311 and cylinder head sealing part 91 constitute the second sealing mechanism.

[0058] When the press pump 100 is in the pressing or rebounding process, the first and second sealing mechanisms release the seal on the balance air passage.

[0059] In addition, sealing mechanisms can be provided between the liquid blocking mechanism 80 and the cylinder head 90, and between the liquid blocking mechanism 80 and the piston rod 30, to prevent the liquid in the container from contacting the upper part of the piston rod 30 when the locking head is in the locked state.

[0060] For example, a main body sealing portion 812 is provided on the main body portion 81 of the liquid blocking mechanism 80. A piston rod second sealing portion 312 is provided on the piston rod 30. In the locked state of the press pump 100, the main body sealing portion 812 and the piston rod second sealing portion 312 cooperate to seal the liquid blocking mechanism 80 and the piston rod 30. Furthermore, when the locked state is released, the main body sealing portion 812 separates from the piston rod second sealing portion 312.

[0061] The main sealing portion 812 is a part of the axial side surface of the main body portion 81. Viewed axially, the main sealing portion 812 is located on the axial side surface of the main body portion 81 at a position further outward than the portion where the groove 811 is provided. In other words, the main sealing portion 812 is located on the axial side surface of the main body portion 81 at a position further outward than the portion abutting the lower end of the helical flange 32. The main sealing portion 812 extends obliquely downward outward from the portion of the axial side surface of the main body portion 81 that abuts the lower end of the helical flange 32. That is, the axial side surface of the main body portion 81 that is further outward than the groove 811 and obliquely upward towards the outer periphery constitutes the main sealing portion 812. At least a portion of the main sealing portion 812 is tapered, obliquely upward towards the outer periphery.

[0062] The piston rod second sealing portion 312 is a part of the axially opposite surface of the first flange 31. The portion of the axially opposite surface of the first flange 31 that slopes downward toward the inner circumference constitutes the piston rod second sealing portion 312. That is, the axially opposite surface of the first flange 31 that slopes downward toward the inner circumference constitutes the piston rod second sealing portion 312. Corresponding to the main sealing portion 812, at least a portion of the piston rod second sealing portion 312 is tapered, sloped downward toward the inner circumference. In this embodiment, the piston rod second sealing portion 312 is located on the outer circumference side of the axially opposite surface of the first flange 31.

[0063] In this embodiment, the first sealing part 311 and the second sealing part 312 of the piston rod are two opposing surfaces of the outer peripheral portion of the first flange 31. By simultaneously providing the first sealing part 311 and the second sealing part 312 of the piston rod on the first flange 31, multiple sealing functions can be achieved with a simple structure.

[0064] Alternatively, a downwardly extending first cylindrical portion 92 may be provided at the lower end of the cylinder head 90, and an upwardly extending second cylindrical portion 82 may be provided at the outer periphery of the main body portion 81 of the liquid-blocking mechanism 80. Viewed axially, the first cylindrical portion 92 is located on the outer periphery side of the cylinder head sealing portion 91. Viewed axially, the first cylindrical portion 92 is on the outer periphery side of the first flange 31 (piston rod 30) and on the inner periphery side of the upper portion 21 (cylinder 20). Viewed axially, the second cylindrical portion 82 is on the outer periphery side of the first flange 31 (piston rod 30) and on the inner periphery side of the upper portion 21 (cylinder 20).

[0065] With the pump in the locked position, the lower end of the first cylinder 92 and the upper end of the second cylinder 82 engage to seal the liquid-blocking mechanism 80 and the cylinder head 90. For example, the first cylinder 92 is fitted onto the outer periphery of the second cylinder 82. Furthermore, when the pump is released from the locked position, the first cylinder 92 and the second cylinder 82 separate, at least when the pressure head 10 is pressed or when the pressure head 10 rebounds. The aforementioned balancing air passage passes between the separated first cylinder 92 and second cylinder 82.

[0066] Furthermore, a liquid-blocking mechanism protrusion 83 protruding outwards may be provided on the liquid-blocking mechanism 80. The liquid-blocking mechanism protrusion 83 protrudes from the outer surface of the second cylindrical portion 82, for example, and can move axially back and forth within the notch of the first hollow portion L1.

[0067] The operation of the press pump 100 will now be explained.

[0068] When the press pump 100 is inserted into the container, the liquid in the container can enter the upper part 21 of the cylinder 20 through the hollow part L of the cylinder 20.

[0069] When a container using a press pump 100 is moved in the locked state of the press pump 100, sealing mechanisms are provided between the liquid blocking mechanism 80 and the cylinder head 90, and between the liquid blocking mechanism 80 and the piston rod 30 (see Figures 3b and 3c). Therefore, even if the container's orientation is changed during transport, the liquid inside the container can be prevented from contacting the upper part of the piston rod 30.

[0070] To unlock the pressure head 10, the user rotates the pressure head 10 relative to the dental brace 40. During this process, the helical flange 32 interacts with the groove 811, causing the liquid-blocking mechanism 80, located on the elastic reset mechanism 50, to move downward relative to the piston rod 30. When released from the locked state, the pump 100 becomes ready for use, and the user pumps the product out of the container by pressing down on the pressure head 10. The perforated portion L has a pressure-balancing function; when a negative pressure is generated inside the container during use, outside air enters the container through the perforated portion to replenish it.

[0071] In addition, a second sealing mechanism (cylinder head sealing part 91 and piston rod first sealing part 311) is provided between the cylinder head 40 or cylinder head 90 and piston rod 30, which can prevent liquid entering the upper part 21 of cylinder 20 from leaking out when it is not in use.

[0072] <Second Embodiment>

[0073] Figure 11 shows a perspective view of the press pump 200 according to the second embodiment of this disclosure, illustrating the press pump's locking state. Figure 12 shows a perspective view of the cylinder 220 of the press pump 200. Hereinafter, the differences from the first embodiment will be mainly described, and sometimes the same symbols will be used to denote the same components as in the above embodiment, and repeated descriptions will be omitted. Unless there is a contrary description below or a conflict with other technical features, the features described in the first embodiment are also applicable to the second embodiment, and will not be described in detail here.

[0074] In this embodiment, the press pump 200 includes a press head 10, a cylinder 220, a piston rod 30, a toothed sleeve 40, and an elastic reset mechanism 50. The cylinder 220 includes: an upper portion 221; a lower portion 22 located below the upper portion 221 and with a smaller diameter than the upper portion 221; and a stepped portion 23 between the upper portion and the lower portion.

[0075] A perforated portion L is provided on the upper part 221 of the cylinder 220. When the pump 100 is inserted into the container, the liquid in the container can enter the upper part 221 through the perforated portion L. In this embodiment, the cylinder 20 has a plurality of wall portions 2211, 2212 arranged circumferentially spaced and extending axially, and an annular portion 2213 connecting the plurality of wall portions 2211, 2212 is provided above the plurality of wall portions 2211, 2212. The perforated portion L is formed between circumferentially adjacent wall portions 2211, 2212.

[0076] The upper portion 221 is also provided with reinforcing ribs 2214 that connect the circumferentially adjacent wall portions 2211 and 2212. For example, the two axial sides of the reinforcing rib 2214 are open portions L. The number of reinforcing ribs is not particularly limited; there can be one or more. By providing reinforcing ribs, the strength reduction caused by the provision of open portions can be compensated.

[0077] The specific embodiments of this disclosure have been described above. However, those skilled in the art will understand that the above specific embodiments do not constitute a limitation of this disclosure. Those skilled in the art can make various modifications based on the above disclosure without exceeding the scope of this disclosure.

Claims

1. A press pump with a hollowed cylinder, characterized by, The press head; The cylinder includes an upper portion and a lower portion; The upper end of the piston rod is fixedly connected with the press head, and the lower end extends into the cylinder and is sealingly fitted on the inner wall of the lower portion; The mouthpiece is connected with the upper end of the cylinder and is connected to the opening of the container in which the press pump is used; and The elastic return mechanism is sleeved on the outer peripheral side of the piston rod, the upper end of the elastic return mechanism is directly or indirectly supported on the piston rod, and the lower end of the elastic return mechanism is directly or indirectly supported on the cylinder, The upper portion is provided with a hollow portion, When the press pump is inserted into the container, the liquid in the container can enter the upper portion through the hollow portion.

2. The press pump with a hollow cylinder according to claim 1, wherein The press pump further comprises a cylinder cover provided on the mouthpiece, the cylinder cover is inserted through the piston rod, and the cylinder cover is provided with a cylinder cover sealing portion, The piston rod is provided with a piston rod first sealing portion, In the ready-to-use state, the piston rod first sealing portion and the cylinder cover sealing portion cooperate to seal the inside and outside of the container, When the press head is pressed or the press head rebounds from the ready-to-use state, the piston rod first sealing portion is separated from the cylinder cover sealing portion to form a balance air passage for air to enter the container from between the piston rod and the cylinder cover through the hollow portion when negative pressure is generated in the container.

3. The press pump with a hollow cylinder according to claim 2, wherein The inner peripheral surface of the cylinder cover includes a beveled portion inclined downward toward the inner peripheral side, and the beveled portion constitutes the cylinder cover sealing portion, The outer peripheral surface of the piston rod is provided with a first flange, and the axially one side surface of the first flange inclined upward toward the outer peripheral side constitutes the piston rod first sealing portion.

4. The press pump with a hollow cylinder according to claim 1, wherein The upper end of the elastic return mechanism is provided with a liquid blocking mechanism, the liquid blocking mechanism has a main body portion sleeved on the outer peripheral side of the piston rod, The outer peripheral surface of the piston rod is provided with a spiral flange, The main body portion is provided with a groove, and the groove cooperates with the spiral flange to lock or unlock the press pump.

5. The press pump with a hollow cylinder according to claim 4, wherein The main body portion is provided with a main body sealing portion, The piston rod is provided with a piston rod second sealing portion, The press pump further comprises a cylinder cover provided on the mouthpiece, the cylinder cover is inserted into the piston rod, and the lower end of the cylinder cover is provided with a first cylinder portion extending downward, The outer peripheral edge of the main body portion is provided with a second cylinder portion extending upward, In the locked state of the press pump, the main body sealing portion cooperates with the piston rod second sealing portion to seal between the liquid blocking mechanism and the piston rod, and the lower end of the first cylinder portion cooperates with the upper end of the second cylinder portion to seal between the liquid blocking mechanism and the cylinder cover.

6. The press pump with a hollow cylinder according to claim 5, wherein The axially one side surface of the main body portion outwardly and upwardly inclined toward the outer peripheral side constitutes the main body sealing portion, ​ A first flange is provided on the outer peripheral surface of the piston rod, and an axial surface of the first flange on the inner peripheral side and inclined downward constitutes a second seal portion of the piston rod.

7. The press pump with a hollow cylinder according to claim 4, wherein The press pump further comprises a cylinder head provided on the mouthpiece, through which the piston rod is inserted, One of the head and the cylinder head is provided with a third cylindrical portion, and the other is provided with an annular groove, In the locked state of the press pump, the third cylindrical portion cooperates with the annular groove to seal the inside and outside of the container.

8. The press pump with a hollow cylinder according to claim 1, wherein The elastic return mechanism is at least partially arranged in the upper portion, The elastic return mechanism has an arcuate elastic strip, When the head is pressed from the ready-to-use state or the head rebounds, the elastic strip can partially extend to the outside of the cylinder through the hollow portion.

9. The press pump with a hollow cylinder according to claim 1, wherein The hollow portion is formed between the circumferentially adjacent wall portions of the upper portion, The upper portion is further provided with a reinforcing rib connecting the circumferentially adjacent wall portions.

10. The press pump with a hollow cylinder according to claim 1, wherein The elastic return mechanism is a plastic spring, The hollow portion includes a first hollow portion arranged as a longitudinal elongated gap, and the plastic spring is provided with a protrusion capable of axially reciprocating in the gap.

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