Pressing pump with hollow cylinder

Abstract

The invention provides a pressing pump with a hollow cylinder, which can reduce the liquid discharge amount of the pressing pump. The pressing pump with the hollowed-out air cylinder comprises a pressing head; a cylinder including an upper portion and a lower portion; the upper end of the piston rod is fixedly connected with the pressing head, and the lower end of the piston rod extends into the air cylinder and can be in sliding sealing fit with the inner wall of the lower side part; the tooth socket is connected with the upper end of the air cylinder and is connected to an opening of a container using the pressing pump; the elastic reset mechanism is arranged on the peripheral side of the piston rod in a sleeving mode, the upper end of the elastic reset mechanism is directly or indirectly supported on the piston rod, the lower end of the elastic reset mechanism is directly or indirectly supported on the air cylinder, and a hollowed-out part is arranged on the upper side of the elastic reset mechanism. And liquid in the container can enter the upper side part through the hollow part.

Description

Technical Field

[0001] The invention relates to a compression pump with a hollow cylinder. Background Art

[0002] Liquid compression pumps are usually composed of pressure heads, tooth sleeves, cylinders, pistons, piston rods, one-way valves, return springs and other components. The compression pump is fixed to the bottle mouth through tooth sleeves, and most of the cylinder is set inside the bottle. The cylinder can be divided into two parts, the upper part of the cylinder and the lower part of the cylinder. The lower part of the cylinder is the piston movement part, and the upper part of the cylinder can be placed with return springs, piston rods and other components. When the compression pump is installed on the bottle, the cylinder will occupy a part of the space in the bottle, and this part of the space is the liquid discharge volume of the cylinder. For compression pumps with a relatively large output, the cylinder required will also be relatively large, resulting in a relatively large amount of liquid discharge from the cylinder. If the cylinder discharges a large amount of liquid, the bottle needs to increase the corresponding volume, otherwise the liquid in the bottle will overflow. The increase in the volume of the bottle will also use more plastic raw materials, resulting in a waste of resources. With the increasing awareness of environmental protection, reducing the discharge volume of compression pumps has become a problem that needs to be solved. Summary of the invention

[0003] The present invention is made based on the above problems existing in the prior art. One of the purposes of the present invention is to provide a press pump with a hollow cylinder, which can reduce the discharge volume of the press pump.

[0004] The present invention provides a pressing pump with a hollow cylinder, comprising: a pressure head; a cylinder, the cylinder comprising an upper part and a lower part; a piston rod, the upper end of the piston rod is fixedly connected to the pressure head, and the lower end extends into the cylinder and can be slidably sealed and fitted on the inner wall of the lower part; a brace, the brace is connected to the upper end of the cylinder and connected to the opening of a container using the pressing pump; and an elastic reset mechanism, the elastic reset mechanism is sleeved on the outer peripheral side of the piston rod, the upper end of the elastic reset mechanism is directly or indirectly supported by the piston rod, and the lower end is directly or indirectly supported by the cylinder, a hollow part is provided in the upper part, when the pressing pump is inserted into the container, the liquid in the container can enter the upper part through the hollow part.

[0005] According to the press pump with a hollow cylinder of the present invention, a hollow portion is provided on the upper part of the cylinder. When the press pump is inserted into a container, the liquid in the container can enter the upper part of the cylinder through the hollow portion, thereby reducing the discharge volume of the press pump.

[0006] In the above-mentioned pressing pump with a hollow cylinder, it is also possible that the pressing pump also includes a cylinder head arranged on the tooth sleeve, the cylinder head is for the piston rod to be inserted and is provided with a cylinder head sealing part, and the piston rod is provided with a piston rod first sealing part. In the standby state, the piston rod first sealing part and the cylinder head sealing part cooperate to seal the inside and outside of the container. When the pressure head is pressed from the standby state or the pressure head rebounds, the piston rod first sealing part is separated from the cylinder head sealing part to form a balanced airway for air to enter the container from between the piston rod and the cylinder head through the hollow part when negative pressure is generated in the container. According to the above structure, by providing a sealing mechanism (cylinder head sealing part and piston rod first sealing part) between the cylinder head and the piston rod, it is possible to prevent the liquid entering the upper part of the cylinder from leaking out in the standby state.

[0007] Preferably, the inner peripheral surface of the cylinder head includes an inclined surface facing obliquely downward on the inner peripheral side, and the inclined surface constitutes the cylinder head sealing portion, and a first flange is provided on the outer peripheral surface of the piston rod, and the axial side surface of the first flange facing obliquely upward on the outer peripheral side constitutes the piston rod first sealing portion. According to the above structure, the piston rod and the cylinder head can be further reliably sealed.

[0008] In the above-mentioned pressing pump with a hollow cylinder, a liquid blocking mechanism may be provided at the upper end of the elastic reset mechanism, the liquid blocking mechanism having a main body sleeved on the outer peripheral side of the piston rod, the outer peripheral surface of the piston rod being provided with a spiral flange, the main body being provided with a groove, the groove cooperating with the spiral flange to put the pressing pump into a locked state or release it from the locked state. According to the above structure, a pressing 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, the pressing pump further comprises a cylinder head arranged on the toothed sleeve, the cylinder head is for the piston rod to pass through and the lower end is provided with a first barrel extending downward, the outer periphery of the main body is provided with a second barrel extending upward, and in the locked state of the pressing pump, the main body sealing part cooperates with the piston rod second sealing part to seal between the liquid blocking mechanism and the piston rod, and the lower end of the first barrel and the upper end of the second barrel cooperate to seal between the liquid blocking mechanism and the cylinder head. According to the above structure, the liquid in the container can be prevented from contacting the upper part of the piston rod in the locked state, thereby preventing the piston rod from bringing the liquid out when it is opened for use.

[0010] Preferably, the main body portion has an axial side surface that is closer to the outer peripheral side than the groove and faces obliquely upward from the outer peripheral side, which constitutes the main body sealing portion, and a first flange is provided on the outer peripheral surface of the piston rod, and the other axial side surface of the first flange that faces obliquely downward from the inner peripheral side constitutes the piston rod second sealing portion. According to the above structure, the liquid blocking mechanism and the piston rod can be further reliably sealed.

[0011] In the above-mentioned pressing pump with a hollow cylinder, the pressing pump may also include a cylinder head arranged on the tooth sleeve, the cylinder head is inserted into the piston rod, one of the pressing head and the cylinder head is provided with a third barrel, and the other is provided with an annular groove, and when the pressing pump is in the locked state, the third barrel cooperates with the annular groove to seal the inside and outside of the container. According to the above structure, by using the pressing head and the cylinder head close to each other in the locked state, the inside and outside of the container can be reliably sealed.

[0012] In the above-mentioned pressing pump with a hollow cylinder, the elastic reset mechanism may be at least partially arranged in the upper part, and the elastic reset mechanism may have an arcuate elastic strip, and when the pressure head is pressed from the standby state or when the pressure head rebounds, the elastic strip may partially extend to the outside of the cylinder through the hollow part. According to the above structure, the hollow part can be used to increase the design freedom of the elastic reset mechanism, and it can be easily set to an elastic reset mechanism with a desired elastic force.

[0013] In the above-mentioned press pump with hollow cylinder, the hollow part may be formed between circumferentially adjacent wall parts of the upper part, and the upper part is further provided with reinforcing ribs connecting the circumferentially adjacent wall parts. By providing the reinforcing ribs, the strength reduced by providing the hollow part can be compensated.

[0014] In the above-mentioned pressing pump with a hollow cylinder, the elastic reset mechanism may also be a plastic spring, the hollow portion includes a first hollow portion, the first hollow portion is arranged as a longitudinal long notch, and the plastic spring is provided with a protrusion, and the protrusion can axially reciprocate in the notch. Thus, the hollow portion can be used to reliably prevent or inhibit the plastic spring from deflecting or twisting during the pressing process. In addition, the plastic spring has the characteristic of being large in size. By arranging the above-mentioned hollow portion on the cylinder in the pressing pump in which the plastic spring is at least partially arranged in the upper part of the cylinder, an excellent effect of reducing the amount of liquid discharged can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of the push pump according to the first embodiment of the present invention is shown, showing a locked state of the push pump.

[0016] Figure 2 A cross-sectional view of the push pump according to the first embodiment of the present invention is shown, showing a locked state of the push pump.

[0017] Figure 3a Show Figure 2 Enlarged view of part A.

[0018] Figure 3b Show Figure 2 Enlarged view of part B.

[0019] Figure 3c Show Figure 2 Enlarged view of part C.

[0020] Figure 4 A cross-sectional view of a compression pump according to a first embodiment of the present invention is shown, showing a state where the compression pump is ready for use.

[0021] Figure 5 Show Figure 4 Enlarged view of part D.

[0022] Figure 6 A perspective view showing a cylinder of a pressing pump according to a first embodiment of the present invention.

[0023] Figure 7 A perspective view showing a portion of a piston rod and a liquid blocking mechanism of a pressing pump according to a first embodiment of the present invention.

[0024] Figure 8 A cross-sectional view showing a portion of a piston rod and a liquid blocking mechanism of a pressing pump according to a first embodiment of the present invention.

[0025] Fig. 9 An exploded perspective view showing a portion of a piston rod and a liquid blocking mechanism of a pressing pump according to a first embodiment of the present invention.

[0026] Fig.10 A perspective view showing a liquid blocking mechanism of a pressing pump according to a first embodiment of the present invention.

[0027] Fig.11 A perspective view of a push pump according to a second embodiment of the present invention is shown, showing a locked state of the push pump.

[0028] Fig.12 A perspective view showing a cylinder of a pressing pump according to a second embodiment of the present invention.

[0029] (Explanation of symbols)

[0030] 10 pressure head

[0031] 11Third barrel

[0032] 20, 220 cylinder

[0033] 21, 221 upper part

[0034] 22 Lower part

[0035] 30 piston rod

[0036] 31 First flange

[0037] 32 spiral flange

[0038] 40 braces

[0039] 50 Elastic reset mechanism

[0040] 52 elastic strips

[0041] 53 Bump

[0042] 80 Liquid-blocking mechanism

[0043] 81 Main body

[0044] 82 Second barrel

[0045] 90 cylinder head

[0046] 91 Cylinder head seal

[0047] 92 First barrel

[0048] 93 annular groove

[0049] 100, 200 press pump

[0050] 311 Piston rod first seal

[0051] 312 piston rod second seal

[0052] 811 groove

[0053] 812 main body seal

[0054] 2214 reinforcement

[0055] L hollow part

[0056] L1 first hollow part DETAILED DESCRIPTION

[0057] In order to facilitate the understanding of the present invention, the specific implementation of the pressing pump of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the drawings show only preferred embodiments of the present invention, which should not be construed as limiting the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and the technical features of the different embodiments described below can be arbitrarily combined with each other without contradiction, and these all fall within the scope of the present invention.

[0058] Hereinafter, the direction parallel to the central axis of the piston rod is referred to as the "axial direction". The circumferential direction centered on the central axis of the piston rod is referred to as the "circumferential direction". In the following specific description of the present invention, the terms used to indicate directions and orientations such as "upper", "lower", "inner", and "outer" are based on the normal orientation of the compression pump in use as shown in the accompanying drawings. It is understood that the orientation of the compression pump may change in situations such as transportation and storage.

[0059] <First embodiment>

[0060] Figure 1 A perspective view of the push pump 100 according to the first embodiment of the present invention is shown, showing a locked state of the push pump. Figure 2 A cross-sectional view of the push pump 100 is shown, showing a locked state of the push pump. Figure 3a , Figure 3b , Figure 3c Shown separately Figure 2 Enlarged view of part A, part B, and part C. Figure 4 A cross-sectional view of the compression pump 100 is shown, showing the compression pump in a state ready for use. Figure 5 Show Figure 4 Enlarged view of part D. Figure 6 A perspective view of the cylinder 20 of the compression pump 100 is shown. Figure 7 A perspective view showing the upper portion of the piston rod 30 of the push pump 100 and the liquid blocking mechanism 80 is shown. Figure 8 A cross-sectional view showing the upper portion of the piston rod 30 and the liquid blocking mechanism 80 of the push pump 100 is shown. Fig. 9 An exploded perspective view of the upper portion of the piston rod 30 and the liquid blocking mechanism 80 of the push pump 100 is shown. Fig.10 A perspective view of the liquid blocking mechanism 80 of the pressing pump 100 is shown.

[0061] The compression pump 100 includes a pressure head 10, a cylinder 20, a piston rod 30, a toothed sleeve 40, and an elastic reset mechanism 50. The toothed sleeve 40 is connected to the upper end of the cylinder 20 and is connected to the opening of a container (not shown) such as a bottle in which the compression pump 100 is used. The cylinder 20 is, for example, a single component formed in one piece. At least a portion of the cylinder 20 is disposed in the container below the container opening.

[0062] The cylinder 20 includes: an upper part 21 for placing components such as a piston rod 30 and an elastic reset mechanism 50; a lower part 22 located below the upper part 21 and having a smaller diameter than the upper part 21, and the lower part 22 is set as a zone for the reciprocating motion of the piston; and a step part 23 between the upper part and the lower part. A cylindrical cylinder plug 60 is installed in 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 installed on the step part 23 and the piston rod 30 is inserted. In addition, a lower check valve 70 is installed at the lower end of the cylinder 20.

[0063] The upper end of the piston rod 30 is fixedly connected to the pressure head 10. A passage is provided inside the piston rod 30 that communicates with the internal passage of the pressure head 10. In the present embodiment, the piston rod 30 has an upper portion and a lower portion that are separated and fixed. However, the piston rod 30 is not limited thereto, and the piston rod may also be a single component formed integrally. The lower end of the piston rod 30 extends into the cylinder 20 and can be slidably sealed on the inner wall of the lower part 22. In more detail, a piston 33 is provided at the lower end of the piston rod 30, and the piston 33 can be slidably sealed on the inner wall of the lower part 22.

[0064] The elastic reset mechanism 50 is at least partially arranged in the upper part 21. The elastic reset mechanism 50 is sleeved on the outer peripheral side of the piston rod 30. The elastic reset mechanism 50 can adopt a plastic spring. In the present embodiment, the elastic reset mechanism 50 is a multilayer structure, which is made of plastic, for example, it can be made of the same plastic material as other parts of the pressing pump 100. For example, the elastic reset mechanism 50 has an elastic reset mechanism body that is accommodated in the interior of the upper part 21 of the cylinder 20 when not pressed, and the elastic reset mechanism body includes an upper circle, a lower circle and a middle circle 51, and at least one bow-shaped elastic strip 52 is respectively arranged between the upper circle and the middle circle 51 and between the lower circle and the middle circle 51, and preferably two or more elastic strips 52 are arranged. In addition, the elastic reset mechanism 50 can also adopt other structures known in the art, for example, it can also be a metal spring.

[0065] The upper end of the elastic return mechanism 50 is directly or indirectly supported on the piston rod 30. In this embodiment, a liquid blocking mechanism 80 is provided at the upper end of the elastic return mechanism 50. The elastic return mechanism 50 is supported on the piston rod 30 via the liquid blocking mechanism 80. In addition, the lower end of the elastic return mechanism 50 is directly or indirectly supported on the cylinder 20. In more detail, the lower end of the elastic return mechanism 50 is supported on the cylinder plug 60 (the lower end of the elastic return mechanism 50 is supported on the cylinder 20 via the cylinder plug 60). In addition, the cylinder plug can also be omitted so that the lower end of the elastic return mechanism 50 is directly supported on the cylinder 20.

[0066] A hollow portion L is provided in the upper portion 21 of the cylinder 20 (the portion above the piston movement range). When the compression pump 100 is inserted into the container, the liquid in the container can enter the upper portion 21 through the hollow portion L. In this way, the discharge amount of the compression pump can be reduced. The hollow portion L can be one or more. In this embodiment, the cylinder 20 has a plurality of (for example, four) wall portions 211, 212, 213, 214 (see FIG. 214 ) arranged at intervals in the circumferential direction and extending in the axial direction. Figure 6), and an annular portion 215 connecting the plurality of wall portions 211, 212, 213, 214 is provided above the plurality of wall portions 211, 212, 213, 214. The hollow portion L is formed between the circumferentially adjacent wall portions of the plurality of wall portions 211, 212, 213, 214. That is, the hollow portion L is formed between the circumferentially adjacent wall portions of the upper portion 21. In addition, the plurality of wall portions may also extend in a direction inclined relative to the axial direction.

[0067] exist Figure 6 In the example shown, the hollow portion L includes a first hollow portion L1 and a second hollow portion L2. A plurality of first hollow portions L1 and second hollow portions L2 are alternately arranged in the circumferential direction. For example, two first hollow portions L1 are provided at positions separated by 180°. The two first hollow portions L1 are respectively located between the wall portions 211 and 212 and between the wall portions 213 and 214. For example, two second hollow portions L2 are provided at positions separated by 180°. The second hollow portions L2 are respectively located between the wall portions 212 and 213 and between the wall portions 214 and 211.

[0068] The first hollow portion L1 is configured as a longitudinal long notch. A protrusion 53 may be provided at least at the upper, middle, or lower portion of the plastic spring serving as the elastic reset mechanism 50. The protrusion 53 can move axially back and forth in the notch of the first hollow portion L1. This can prevent or inhibit the plastic spring from deflecting or twisting during the pressing process. Figure 2 In the example shown, the projection 53 extends from the middle ring 51 of the elastic reset mechanism body to the axial lower side and the outer peripheral side. In addition, the projection 53 can also be arranged at other positions in the axial direction of the plastic spring.

[0069] The circumferential width of the second hollow portion L2 is greater than that of the first hollow portion L1. When the ram 10 is pressed from the standby state or 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.

[0070] A liquid blocking mechanism 80 is provided at the upper end of the elastic return mechanism 50. The liquid blocking mechanism 80 is at least partially disposed in the upper portion 21. The liquid blocking mechanism 80 has a main body 81 sleeved on the outer circumference of the piston rod 30. The main body 81 is accommodated inside the upper portion 21 of the cylinder 20.

[0071] like Figure 2 , Figure 4 and Figure 7 As shown, the outer circumferential surface of the piston rod 30 is provided with a spiral flange 32. For example, two spiral flanges 32 are provided.

[0072] The main body 81 has a groove 811 on its inner circumference corresponding to the spiral flange 32. The groove 811 cooperates with the spiral flange 32 to put the pressing pump 100 in a locked state (see Figure 2 ) or release from the locked state. Figure 4 An example of releasing the lock state is shown. Figure 4 When in the ready-to-use state, the lower end of the spiral flange 32 is, for example, disengaged from the groove 811, and, under the action of the elastic reset mechanism 50, the main body 81 is pushed upward, whereby the lower end of the spiral flange 32 abuts against the axial side surface of the main body 81.

[0073] The pressing pump 100 further includes a cylinder head 90 disposed on the dental brace 40 , and the piston rod 30 is inserted through the cylinder head 90 . The cylinder head 90 is connected to the dental brace 40 and is mounted on the cylinder 20 .

[0074] exist Figure 2 , Figure 4 In the structure shown in FIG. 4 , the cylinder head 90 and the toothed sleeve 40 are two separate parts. It can be understood by those skilled in the art that the structure in which the toothed sleeve and the cylinder head are integrated (the cylinder head and the toothed sleeve are formed in one piece) is also common in the art.

[0075] The cylinder head 90 is provided with a cylinder head sealing portion 91. The piston rod 30 is provided with a piston rod first sealing portion 311. In the state to be used, the piston rod first sealing portion 311 and the cylinder head sealing portion 91 cooperate to seal the inside and outside of the container (seal the balance air passage described below).

[0076] In this embodiment, the cylinder head sealing portion 91 is a part of the inner peripheral surface of the cylinder head 90. The inner peripheral surface of the cylinder head 90 includes an inclined portion facing obliquely downward on the inner peripheral side, and the inclined portion is located at the lower part of the inner peripheral surface of the cylinder head 90, constituting the cylinder head sealing portion 91. At least a part of the cylinder head sealing portion 91 is in a conical shape facing obliquely downward on the inner peripheral side. In addition, when the cylinder head and the socket are formed integrally, the cylinder head sealing portion that cooperates with the first piston rod sealing portion 311 is located on the inner peripheral surface of the socket.

[0077] A first flange 31 is provided on the outer circumferential surface of the piston rod 30. The first flange 31 is provided on the upper side of the spiral flange 32. The first flange 31 is shaped to extend from the outer circumferential surface of the piston rod 30 toward the outer circumferential side and then extend obliquely downward toward the outer circumferential side. The first flange 31 is formed over the entire circumference.

[0078] The first piston rod seal 311 is a portion 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 on the outer peripheral side constitutes the first piston rod seal 311. That is, the axial side surface of the first flange 31 that faces obliquely upward on the outer peripheral side constitutes the first piston rod seal 311. Corresponding to the cylinder head seal 91, at least a portion of the first piston rod seal 311 is tapered obliquely upward on the outer peripheral side. In the present embodiment, the first piston rod seal 311 is located on the axial side surface of the first flange 31, close to the outer peripheral side.

[0079] In one example, the cylinder head 90 and the piston rod 30 are both made of plastic, and there may be a certain interference fit between the cylinder head 90 and the piston rod 30 when they are fitted and sealed, thereby achieving a more reliable seal.

[0080] When the ram 10 is pressed from the standby state, the first piston rod sealing portion 311 is separated from the cylinder head sealing portion 91 to form a balanced air passage for allowing air to enter the container from between the piston rod 30 and the cylinder head 90 through the hollow portion L when negative pressure is generated in the container. The balanced air passage connects the space inside the container and the space outside the container. In addition, the balanced air passage can also be formed during the rebound process of the ram 10.

[0081] In addition, in the ready-to-use state, the upward movement position of the piston rod 30 is limited, for example, by a stopper on the cylinder head 90 abutting against the first flange 31 .

[0082] In addition, the pressing pump 100 is provided with a first sealing mechanism, and when the pressing pump 100 is in the head locking state, the first sealing mechanism seals the above-mentioned balancing air passage. In this embodiment, the first sealing mechanism is provided between the pressing head 10 and the cylinder head 90 .

[0083] The pressure head 10 may be provided with a third barrel 11 extending downward. The cylinder head 90 may be provided with an annular groove 93 recessed downward. When the pressing pump 100 is in the locked state, the third barrel 11 cooperates with the annular groove 93. Specifically, the third barrel 11 is inserted into the annular groove 93 to seal the inside and outside of the container. At this time, the inner circumference or outer circumference of the third barrel 11 may be in close contact with the wall of the annular groove 93. The third barrel 11 and the annular groove 93 constitute a first sealing mechanism. In addition, when the locking state is released, the third barrel 11 and the annular groove 93 are separated. In addition, instead of the above-mentioned third barrel 11 and the annular groove 93, an annular groove recessed upward may be provided on the pressure head 10, and the cylinder head 90 may be provided with a third barrel extending upward.

[0084] The pressing pump 100 is also provided with a second sealing mechanism, which seals the above-mentioned balancing air passage when the pressing pump 100 is in a state to be used. In this embodiment, the second sealing mechanism is arranged between the piston rod 30 and the cylinder head 90. The above-mentioned piston rod first sealing portion 311 and the cylinder head sealing portion 91 constitute the second sealing mechanism.

[0085] When the compression pump 100 is in the compression process or the rebound process, the first sealing mechanism and the second sealing mechanism release the seal on the balance airway.

[0086] In addition, sealing mechanisms may 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, respectively, to prevent the liquid in the container from contacting the upper portion of the piston rod 30 when the head is locked.

[0087] For example, a main body sealing portion 812 is provided on the main body 81 of the liquid blocking mechanism 80. The piston rod 30 is provided with a piston rod second sealing portion 312. In the locked state of the pressing pump 100, the main body sealing portion 812 cooperates with the piston rod second sealing portion 312 to seal between the liquid blocking mechanism 80 and the piston rod 30. In addition, when the locked state is released, the main body sealing portion 812 is separated from the piston rod second sealing portion 312.

[0088] The main body sealing portion 812 is a portion of one axial side surface of the main body 81. When viewed in the axial direction, the main body sealing portion 812 is located on one axial side surface of the main body 81 at a position closer to the outer peripheral side than the position where the groove 811 is provided. In other words, the main body sealing portion 812 is located on one axial side surface of the main body 81 at a position closer to the outer peripheral side than the position abutting against the lower end of the spiral flange 32. The main body sealing portion 812 extends obliquely downward toward the outer peripheral side from the position abutting against the lower end of the spiral flange 32 on one axial side surface of the main body 81. That is, the one axial side surface of the main body 81 that is closer to the outer peripheral side than the groove 811 and faces obliquely upward toward the outer peripheral side constitutes the main body sealing portion 812. At least a portion of the main body sealing portion 812 is tapered obliquely upward toward the outer peripheral side.

[0089] The second piston rod sealing portion 312 is a part of the other axial side surface of the first flange 31. The part of the other axial side surface of the first flange 31 that faces obliquely downward on the inner circumference constitutes the second piston rod sealing portion 312. That is, the axial side surface of the first flange 31 that faces obliquely downward on the inner circumference constitutes the second piston rod sealing portion 312. Corresponding to the main body sealing portion 812, at least a part of the second piston rod sealing portion 312 is tapered obliquely downward on the inner circumference. In this embodiment, the second piston rod sealing portion 312 is located on the other axial side surface of the first flange 31, close to the outer circumference.

[0090] In this embodiment, the first piston rod sealing portion 311 and the second piston rod sealing portion 312 are two opposite surfaces of the outer peripheral side portion of the first flange 31. By simultaneously arranging the first piston rod sealing portion 311 and the second piston rod sealing portion 312 on the first flange 31, multiple sealing functions can be achieved with a simple structure.

[0091] A first cylindrical portion 92 extending downward may be provided at the lower end of the cylinder head 90, and a second cylindrical portion 82 extending upward may be provided at the outer peripheral edge of the main body portion 81 of the liquid blocking mechanism 80. When viewed in the axial direction, the first cylindrical portion 92 is located at a position closer to the outer peripheral side than the cylinder head sealing portion 91. When viewed in the axial direction, the first cylindrical portion 92 is closer to the outer peripheral side than the first flange 31 (piston rod 30), and closer to the inner peripheral side than the upper portion 21 (cylinder 20). When viewed in the axial direction, the second cylindrical portion 82 is closer to the outer peripheral side than the first flange 31 (piston rod 30), and closer to the inner peripheral side than the upper portion 21 (cylinder 20).

[0092] In the locked state of the pressing pump, the lower end of the first barrel 92 and the upper end of the second barrel 82 cooperate to seal between the liquid blocking mechanism 80 and the cylinder head 90. For example, the first barrel 92 is sleeved on the outer peripheral side of the second barrel 82. In addition, when the locked state is released, at least when the ram 10 is pressed or the ram 10 rebounds, the first barrel 92 and the second barrel 82 are separated. The above-mentioned balance air passage passes between the first barrel 92 and the second barrel 82 separated from each other.

[0093] In addition, a liquid blocking mechanism protrusion 83 protruding toward the outer circumference may be provided on the liquid blocking mechanism 80. The liquid blocking mechanism protrusion 83 protrudes from the outer surface of the second cylinder 82, for example, and can reciprocate axially in the notch of the first hollow portion L1.

[0094] Next, the operation of the pressing pump 100 will be described.

[0095] When the pressing pump 100 is inserted into the container, the liquid in the container may enter the upper portion 21 of the cylinder 20 through the hollow portion L of the cylinder 20 .

[0096] The container using the push pump 100 is transported in the locked state of the push pump 100. Since 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 Figure 3b , Figure 3c ), therefore, even if the posture of the container is changed during transportation, it is possible to prevent the liquid in the container from contacting the upper part of the piston rod 30.

[0097] To unlock the pressure head 10, the user rotates the pressure head 10 relative to the mouthpiece 40. During this process, the spiral flange 32 interacts with the groove 811, so that the liquid blocking mechanism 80 provided on the elastic reset mechanism 50 moves downward relative to the piston rod 30. When the lock state is released, the press pump 100 becomes ready for use, and the user presses the pressure head 10 downward to pump the product out of the container. The hollow portion L has the function of balancing air pressure. When pressed for use, when negative pressure is generated in the container, the outside air will enter the container through the hollow portion for replenishment.

[0098] In addition, a second sealing mechanism (cylinder head sealing part 91 and piston rod first sealing part 311) is provided between the sleeve 40 or cylinder head 90 of the pressing pump and the piston rod 30, which can prevent the liquid entering the upper part 21 of the cylinder 20 from leaking out when in use.

[0099] <Second embodiment>

[0100] Fig.11 A perspective view of a press pump 200 according to a second embodiment of the present invention is shown, showing a locked state of the press pump. Fig.122 shows a perspective view of the cylinder 220 of the pressing pump 200. The following mainly describes the differences from the first embodiment, and sometimes the same components as the above embodiment are marked with the same symbols and repeated descriptions are omitted. Unless there is a contrary description in the following content or it conflicts 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.

[0101] In this embodiment, the pressing pump 200 includes a pressure 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 having a smaller diameter than the upper portion 221, and a step portion 23 between the upper portion and the lower portion.

[0102] A hollow portion L is provided at the upper portion 221 of the cylinder 220. When the pressing pump 100 is inserted into the container, the liquid in the container can enter the upper portion 221 through the hollow portion L. In this embodiment, the cylinder 20 has a plurality of wall portions 2211, 2212 arranged at intervals in the circumferential direction and extending in the axial direction, and an annular portion 2213 connecting the plurality of wall portions 2211, 2212 is provided above the plurality of wall portions 2211, 2212. The hollow portion L is formed between the circumferentially adjacent wall portions 2211, 2212.

[0103] The upper portion 221 is further provided with a reinforcing rib 2214 connecting the circumferentially adjacent wall portions 2211 and 2212. For example, both axial sides of the reinforcing rib 2214 are hollow portions L. The number of reinforcing ribs is not particularly limited, and may be one or more. By providing the reinforcing ribs, the strength reduced by providing the hollow portions can be compensated.

[0104] The above describes the specific embodiments of the present invention, but those skilled in the art will understand that the above specific embodiments do not constitute a limitation of the present invention. Those skilled in the art can make various modifications based on the above disclosure without exceeding the scope of the present invention.

Claims

1. A compression pump with a hollow cylinder, characterized in that: include: Pressure head; a cylinder comprising an upper portion and a lower portion; A piston rod, the upper end of which is fixedly connected to the pressure head, and the lower end of which extends into the cylinder and is slidably and sealingly fitted on the inner wall of the lower part; a mouthpiece connected to the upper end of the cylinder and connected to the opening of a container using the compression pump; and The elastic reset mechanism is sleeved on the outer peripheral side of the piston rod, the upper end of the elastic reset mechanism is directly or indirectly supported by the piston rod, and the lower end is directly or indirectly supported by the cylinder. A hollow portion is provided on the upper side portion. When the push pump is inserted into a container, the liquid in the container can enter the upper portion through the hollow portion.

2. The pressing pump with a hollow cylinder according to claim 1, characterized in that: The pressing pump further includes a cylinder head disposed on the toothed sleeve, the cylinder head is for the piston rod to pass through and is provided with a cylinder head sealing portion. The piston rod is provided with a first piston rod sealing portion. In the state of being ready for use, the first sealing part of the piston rod and the sealing part of the cylinder head cooperate to seal the inside and outside of the container. When the pressure head is pressed from the standby state or when the pressure head rebounds, the first sealing part of the piston rod is separated from the sealing part of the cylinder head to form a balanced air passage for air to enter the container from between the piston rod and the cylinder head through the hollow part when negative pressure is generated in the container.

3. The pressing pump with a hollow cylinder according to claim 2, characterized in that: The inner peripheral surface of the cylinder head includes an inclined surface portion which is inclined downward toward the inner peripheral side, and the inclined surface portion constitutes the cylinder head sealing portion. A first flange is provided on the outer peripheral surface of the piston rod, and an axially-side surface of the first flange that faces obliquely upward on the outer peripheral side constitutes a first sealing portion of the piston rod.

4. The pressing pump with a hollow cylinder according to claim 1, characterized in that: A liquid blocking mechanism is provided at the upper end of the elastic reset mechanism, and the liquid blocking mechanism has a main body portion sleeved on the outer peripheral side of the piston rod. The outer circumference of the piston rod is provided with a spiral flange. The main body is provided with a groove, and the groove cooperates with the spiral flange to put the pressing pump into a locked state or release it from the locked state.

5. The pressing pump with a hollow cylinder according to claim 4, characterized in that: The main body is provided with a main body sealing portion, The piston rod is provided with a second piston rod sealing portion, The pressing pump further comprises a cylinder head arranged on the tooth sleeve, the cylinder head is for the piston rod to be inserted through and the lower end of the cylinder head is provided with a first barrel portion extending downward. The outer periphery of the main body is provided with a second cylindrical portion extending upward. When the pressing pump is in the locked state, the main body sealing portion cooperates with the second sealing portion of the piston rod to seal between the liquid blocking mechanism and the piston rod, and the lower end of the first cylinder portion and the upper end of the second cylinder portion cooperate to seal between the liquid blocking mechanism and the cylinder head.

6. The pressing pump with a hollow cylinder according to claim 5, characterized in that: The main body portion has a main body seal portion formed on one axial side of the main body portion that is closer to the outer circumference than the groove and obliquely upward toward the outer circumference. A first flange is provided on the outer peripheral surface of the piston rod, and the other axial side surface of the first flange facing obliquely downward on the inner peripheral side constitutes the piston rod second sealing portion.

7. The pressing pump with a hollow cylinder according to claim 4, characterized in that: The pressing pump further includes a cylinder head disposed on the tooth sleeve, through which the piston rod is inserted. One of the pressure head and the cylinder head is provided with a third cylinder portion, and the other is provided with an annular groove. When the push pump is in a locked state, the third barrel portion cooperates with the annular groove to seal the inside and outside of the container.

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

9. The pressing pump with a hollow cylinder according to claim 1, characterized in that: The hollow portion is formed between circumferentially adjacent wall portions of the upper portion. The upper portion is further provided with reinforcing ribs connecting the circumferentially adjacent wall portions.

10. The pressing pump with a hollow cylinder according to claim 1, characterized in that: The elastic reset mechanism is a plastic spring. The hollow portion includes a first hollow portion, which is configured as a longitudinal long notch. The plastic spring is provided with a protrusion, and the protrusion can axially reciprocate in the notch.

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