Pressing pump with hollow cylinder

Abstract

The utility model 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 utility model relates to a press pump with a hollow cylinder. BACKGROUND

[0002] The liquid press pump is usually composed of a pressure head, a mouthpiece, a cylinder, a piston, a piston rod, a one-way valve, a reset spring and the like. The press pump is fixed on the bottle mouth through the mouthpiece, and most of the cylinder is arranged in the bottle. The cylinder can be divided into two parts, a cylinder upper part and a cylinder lower part. The cylinder lower part is a piston moving part, and the cylinder upper part can place the reset spring, the piston rod and the like. When the press pump is mounted on the bottle, the cylinder will occupy a part of the space in the bottle, and this part of the space is the cylinder discharge capacity. The press pump with a larger discharge capacity needs a larger cylinder, resulting in a larger cylinder discharge capacity. The larger cylinder discharge capacity needs the bottle to increase the corresponding volume, otherwise the liquid in the bottle will overflow. The increase of the bottle volume also needs more plastic raw materials, causing the waste of resources. With the enhancement of people's environmental protection consciousness, it is necessary to reduce the discharge capacity of the press pump. SUMMARY

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

[0004] The utility model provides a press pump with a hollow cylinder, which comprises a pressure head, a cylinder comprising an upper part and a lower part, a piston rod, the upper end of the piston rod being fixedly connected with the pressure head, the lower end of the piston rod extending into the cylinder and being sealingly fitted on the inner wall of the lower part in a slidable manner, a mouthpiece connected with the upper end of the cylinder and connected to the opening of a container using the press pump, and an elastic reset mechanism, the elastic reset mechanism being sleeved on the outer circumferential side of the piston rod, the upper end of the elastic reset mechanism being directly or indirectly supported on the piston rod, and the lower end of the elastic reset mechanism being directly or indirectly supported on the cylinder, a hollow part being arranged in the upper part, and when the press pump is inserted into the container, the liquid in the container can enter the upper part of the cylinder through the hollow part.

[0005] According to the press pump with a hollow cylinder, the hollow part is arranged in the upper part of the cylinder, when the press pump is inserted into the container, the liquid in the container can enter the upper part of the cylinder through the hollow part, and the discharge capacity of the press pump can be reduced.

[0006] In the press pump with the hollow cylinder, the press pump can further include a cylinder cover arranged in the mouthpiece and through which the piston rod is inserted, 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 pressure head is pressed or the pressure 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 in the case of generating negative pressure in the container. According to the above structure, by arranging the sealing mechanism (the cylinder cover sealing portion and the piston rod first sealing portion) between the cylinder cover and the piston rod, the leakage of liquid into the upper part of the cylinder can be prevented in the ready-to-use state.

[0007] Preferably, the inner circumferential surface of the cylinder cover includes a beveled portion inclined downward toward the inner circumferential side, and the beveled portion constitutes the cylinder cover sealing portion. The outer circumferential surface of the piston rod is provided with a first flange, and an axial one-side surface of the first flange inclined upward toward the outer circumferential side constitutes the piston rod first sealing portion. According to the above structure, the sealing between the piston rod and the cylinder cover can be further reliably achieved.

[0008] In the press pump with the hollow cylinder, the press pump can further include a liquid blocking mechanism arranged at the upper end of the elastic return mechanism, and the liquid blocking mechanism has a main body portion sleeved on the outer circumferential side of the piston rod. The outer circumferential surface of the piston rod is provided with a helical flange, and the main body portion is provided with a groove cooperating with the helical flange to lock or unlock the press pump. According to the above structure, the press pump with the locking function can be provided.

[0009] Preferably, 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 includes a cylinder cover arranged in the mouthpiece and through which the piston rod is inserted, and the lower end of the cylinder cover is provided with a first barrel portion extending downward. The outer circumferential edge of the main body portion is provided with a second barrel 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 barrel portion cooperates with the upper end of the second barrel portion to seal between the liquid blocking mechanism and the cylinder cover. According to the above structure, the liquid in the container and the upper part of the piston rod can be prevented from contacting in the locked state, and further prevented from being brought out by the piston rod when being opened and used.

[0010] Preferably, an axial one-side surface of the main body portion on the outer circumferential side of the groove and inclined upward toward the outer circumferential side constitutes a main body sealing portion. The outer circumferential surface of the piston rod is provided with a first flange, and an axial other-side surface of the first flange inclined downward toward the inner circumferential side constitutes the piston rod second sealing portion. According to the above structure, the sealing between the liquid blocking mechanism and the piston rod can be further reliably achieved.

[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 A perspective view of the push pump according to the first embodiment of the present invention is shown, illustrating the lock 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, illustrating the lock 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 An enlarged view of C of Figure 2 is shown.

[0020] Figure 4 A sectional view of the press pump of the first embodiment of the present application is shown, showing a state of the press pump to be used.

[0021] Figure 5 An enlarged view of D of Figure 4 is shown.

[0022] Figure 6 A perspective view of the cylinder of the press pump of the first embodiment of the present application is shown.

[0023] Figure 7 A perspective view of a part of the piston rod and the liquid blocking mechanism of the press pump of the first embodiment of the present application is shown.

[0024] Figure 8 A sectional view of a part of the piston rod and the liquid blocking mechanism of the press pump of the first embodiment of the present application is shown.

[0025] Figure 9 An exploded perspective view of a part of the piston rod and the liquid blocking mechanism of the press pump of the first embodiment of the present application is shown.

[0026] Figure 10 A perspective view of the liquid blocking mechanism of the press pump of the first embodiment of the present application is shown.

[0027] Figure 11 A perspective view of the press pump of the second embodiment of the present application is shown, showing a state of the press pump to be locked.

[0028] Figure 12 A perspective view of the cylinder of the press pump of the second embodiment of the present application is shown.

[0029] (Symbol explanation)

[0030] 10 pressure head

[0031] 11 third cylinder portion

[0032] 20, 220 cylinder

[0033] 21, 221 upper side portion

[0034] 22 lower side portion

[0035] 30 piston rod

[0036] 31 first flange

[0037] 32 helical flange

[0038] 40 mouthpiece

[0039] 50 elastic reset mechanism

[0040] 52 elastic strip

[0041] 53 protrusion

[0042] 80 liquid blocking mechanism

[0043] 81 main body part

[0044] 82 second cylinder part

[0045] 90 cylinder head

[0046] 91 cylinder head sealing part

[0047] 92 first cylinder part

[0048] 93 annular groove

[0049] 100, 200 press pump

[0050] 311 piston rod first sealing part

[0051] 312 piston rod second sealing part

[0052] 811 recess

[0053] 812 main body sealing part

[0054] 2214 reinforcing rib

[0055] L hollow part

[0056] L1 first hollow part DETAILED DESCRIPTION

[0057] In order to facilitate the understanding of the present application, the specific embodiments of the press pump of the present application will be described in detail below in combination with the drawings. It should be understood that the preferred embodiments shown in the drawings are only the preferred embodiments of the present application, which should not be understood as limiting the scope of the present application. Those skilled in the art can make various obvious modifications, variations, equivalent replacements to the present application on the basis of the embodiments shown in the drawings, and under the premise of not contradicting, the technical features described in the following different embodiments can be combined with each other arbitrarily, and these all fall within the scope of the present application.

[0058] Hereinafter, a direction parallel to the center axis of the piston rod will be referred to as "axial direction". A circumferential direction centered on the center axis of the piston rod will be simply referred to as "circumferential direction". In the following detailed description of the present application, expressions indicating directions and orientations such as "upper", "lower", "inner", "outer" and the like are based on the orientation of the press pump as shown in the drawings in a normal use state, and it will be understood that the orientation of the press pump can be changed in situations such as transportation and storage.

[0059] <First Embodiment>

[0060] Figure 1 A perspective view of the press pump 100 of the first embodiment of the present application is shown, showing a locked state of the press pump. Figure 2 A cross-sectional view of the press pump 100 is shown, showing a locked state of the press pump. Figure 3a Figure 3b Figure 3c A perspective view of the press pump 100 is shown, showing a locked state of the press pump. Figure 2 A perspective view of the press pump 100 is shown, showing a locked state of the press pump. Figure 4 A cross-sectional view of the press pump 100 is shown, showing a locked state of the press pump. Figure 5 A cross-sectional view of the press pump 100 is shown, showing a locked state of the press pump. Figure 4 A cross-sectional view of the press pump 100 is shown, showing a locked state of the press pump. Figure 6 A perspective view of the cylinder 20 of the press pump 100 is shown. Figure 7 A perspective view of the upper portion of the piston rod 30 and the liquid blocking mechanism 80 of the press pump 100 is shown. Figure 8 A cross-sectional view of the upper portion of the piston rod 30 and the liquid blocking mechanism 80 of the press pump 100 is shown. Figure 9 An exploded perspective view of the upper portion of the piston rod 30 and the liquid blocking mechanism 80 of the press pump 100 is shown. Figure 10 A perspective view of the liquid blocking mechanism 80 of the press pump 100 is shown.

[0061] The press pump 100 includes a head 10, a cylinder 20, a piston rod 30, a sleeve 40, and a resilient return mechanism 50. The 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 in which the press pump 100 is used. The cylinder 20 is, for example, a single piece formed integrally. At least a portion of the cylinder 20 is disposed within the container below the opening of the container.

[0062] ​​The cylinder 20 includes an upper portion 21 for housing the piston rod 30, the elastic return mechanism 50, and the like, a lower portion 22 located below the upper portion 21 and having a smaller diameter than the upper portion 21, the lower portion 22 being configured as a stroke range of the piston, and a step portion 23 between the upper portion and the lower portion. A cylindrical cylinder plug 60 is installed in the cylinder 20. The cylinder plug 60 is located above the piston 33. The cylinder plug 60 can be fixed in the cylinder 20 by a flange-groove structure or other known means. The cylinder plug 60 is installed on the step portion 23 and allows the piston rod 30 to pass therethrough. Further, a lower one-way valve 70 is installed at an inner lower end of the cylinder 20.

[0063] The upper end of the piston rod 30 is fixedly connected to the pressure head 10. The piston rod 30 has a passage 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 separate and fixed. However, the piston rod can also be a single member formed integrally. The lower end of the piston rod 30 extends into the cylinder 20 and is sealingly fitted to the inner wall of the lower portion 22 in a slidable manner. More specifically, the lower end of the piston rod 30 is provided with a piston 33 that is sealingly fitted to the inner wall of the lower portion 22 in a slidable manner.

[0064] The elastic return mechanism 50 is at least partially disposed in the upper portion 21. The elastic return mechanism 50 is fitted to the outer circumferential side of the piston rod 30. The elastic return mechanism 50 can be a plastic spring. In the present embodiment, the elastic return mechanism 50 is a multi-layer structure made of plastic, for example, the same plastic material as the other portions of the pressure pump 100. For example, the elastic return mechanism 50 has an elastic return mechanism main body that is housed in the interior of the upper portion 21 of the cylinder 20 when not pressed, the elastic return mechanism main body including an upper ring, a lower ring, and a middle ring 51, at least one elastic strip 52, preferably two or more elastic strips 52, being provided between the upper ring and the middle ring 51 and between the lower ring and the middle ring 51. In addition, the elastic return mechanism 50 can also have other structures known in the art, for example, it can also be a spring made of metal.

[0065] The upper end of the elastic return mechanism 50 is directly or indirectly supported on the piston rod 30. In the present 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. More specifically, 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). Alternatively, the cylinder plug can be omitted, and the lower end of the elastic return mechanism 50 can be directly supported on the cylinder 20.

[0066] A perforated portion L is provided in the upper part 21 (the part 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 part 21 through the perforated portion L. This reduces the amount of liquid discharged by the press pump. There can be one or more perforated portions L. In this embodiment, the cylinder 20 has multiple (e.g., four) wall portions 211, 212, 213, 214 (see reference 1) that are spaced apart circumferentially and extend axially. Figure 6 The upper portion 21 has an annular portion 215 connecting the multiple wall portions 211, 212, 213, and 214 above it. A cutout portion L is formed between circumferentially adjacent wall portions 211, 212, 213, and 214. That is, the cutout portion L is formed between circumferentially adjacent wall portions of the upper portion 21. Furthermore, the multiple wall portions may extend in a direction inclined relative to the axial direction.

[0067] exist Figure 6 In the example shown, 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.

[0068] 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, which serves 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. Figure 2 In the example shown, the protrusion 53 extends axially downward and outward from the central ring 51 of the elastic reset mechanism body. Alternatively, the protrusion 53 may also be provided at other locations axially on the plastic spring.

[0069] 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.

[0070] 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.

[0071] As shown in Figure 2 , Figure 4 and Figure 7 , the outer peripheral surface of the piston rod 30 is provided with a helical flange 32. The helical flange 32 is provided with two, for example.

[0072] The main body portion 81 is provided with a recess 811 on the inner peripheral surface corresponding to the helical flange 32. The recess 811 cooperates with the helical flange 32 to place the press pump 100 in the locked state (refer to Figure 2 ) or release from the locked state. Figure 4 An example of release from the locked state is shown. In the ready-to-use state of Figure 4 , the lower end of the helical flange 32 is, for example, disengaged from the recess 811, and, under the action of the elastic return means 50, the main body portion 81 is urged upward, whereby the lower end of the helical flange 32 abuts against the axial one side surface of the main body portion 81.

[0073] The press pump 100 further includes a cylinder head 90 provided to the case 40, through which the piston rod 30 is inserted. The cylinder head 90 is coupled to the case 40 and mounted to the cylinder 20.

[0074] In the structure shown in Figure 2 , Figure 4 , the cylinder head 90 and the case 40 are two separate components from each other. It will be appreciated by those skilled in the art that a structure in which the case and the cylinder head are integrated (the cylinder head is formed integrally with the case) 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 ready-to-use state, 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 following balance air passage).

[0076] In the present 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 a beveled portion inclined downward toward the inner peripheral side, which is located in the lower portion of the inner peripheral surface of the cylinder head 90 and constitutes the cylinder head sealing portion 91. At least a part of the cylinder head sealing portion 91 is conical toward the inner peripheral side. Further, in the case where the cylinder head is formed integrally with the case, the cylinder head sealing portion that cooperates with the piston rod first sealing portion 311 is located on the inner peripheral surface of the case.

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

[0078] The piston rod first seal portion 311 is a part of the axial one side surface of the first flange 31. The part of the axial one side surface of the first flange 31 which is inclined upward toward the outer periphery side constitutes the piston rod first seal portion 311. That is, the axial one side surface of the first flange 31 which is inclined upward toward the outer periphery side constitutes the piston rod first seal portion 311. At least a part of the piston rod first seal portion 311 is conical toward the outer periphery side upward in correspondence with the cylinder head seal portion 91. In the present embodiment, the piston rod first seal portion 311 is located at a position closer to the outer periphery side in the axial one side surface of the first flange 31.

[0079] In one example, the cylinder head 90 and the piston rod 30 are made of plastic, and the cylinder head 90 and the piston rod 30 can have a certain amount of interference when they are mated and sealed, so that the sealing can be more reliable.

[0080] When the plunger 10 is pressed from the ready-to-use state, the piston rod first seal portion 311 is separated from the cylinder head seal portion 91 to form a balance air passage which allows air to enter the container from the piston rod 30 and the cylinder head 90 via the hollow portion L in the case where a negative pressure is generated in the container. The balance air passage communicates the space inside the container and the space outside the container. In addition, the balance air passage can also be formed during the rebound of the plunger 10.

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

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

[0083] A third cylindrical portion 11 which extends downward can be provided on the plunger 10. An annular groove 93 which is recessed downward can be provided on the cylinder head 90. In the locked state of the pressing pump 100, the third cylindrical portion 11 cooperates 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 periphery surface or the outer periphery 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 the first sealing mechanism. In addition, the third cylindrical portion 11 and the annular groove 93 are separated when the locked state is released. Alternatively, instead of the above-mentioned third cylindrical portion 11 and the annular groove 93, an annular groove which is recessed upward can be provided on the plunger 10, and a third cylindrical portion which extends upward can be provided on the cylinder head 90.

[0084] The press pump 100 is also provided with a second sealing mechanism that seals the above-mentioned balance air passage when the press pump 100 is in the ready-to-use state. In the present embodiment, the second sealing mechanism is provided between the piston rod 30 and the cylinder cover 90. The above-mentioned piston rod first sealing portion 311 and the cylinder cover sealing portion 91 constitute the second sealing mechanism.

[0085] When the press pump 100 is in the pressing process or the rebound process, the above-mentioned first sealing mechanism and the second sealing mechanism release the sealing of the balance air passage.

[0086] Further, a sealing mechanism can be provided between the liquid blocking mechanism 80 and the cylinder cover 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 in the locked state.

[0087] For example, the main body sealing portion 812 is provided to the main body portion 81 of the liquid blocking mechanism 80. The piston rod second sealing portion 312 is provided to the piston rod 30. In the locked state of the press 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. Further, 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 part of the axial one side surface of the main body portion 81. In the axial direction, the main body sealing portion 812 is located at a position on the outer peripheral side of the axial one side surface of the main body portion 81 than the portion where the groove 811 is provided. In other words, the main body sealing portion 812 is located at a position on the outer peripheral side of the axial one side surface of the main body portion 81 than the portion that abuts against the lower end of the spiral flange 32. The main body sealing portion 812 extends obliquely downward from the portion on the axial one side surface of the main body portion 81 that abuts against the lower end of the spiral flange 32 toward the outer peripheral side. That is, the axial one side surface of the main body portion 81 on the outer peripheral side than the groove 811 and obliquely upward toward the outer peripheral side constitutes the main body sealing portion 812. At least a part of the main body sealing portion 812 is tapered obliquely upward toward the outer peripheral side.

[0089] The piston rod second sealing portion 312 is a part of the axial other side surface of the first flange 31. The portion obliquely downward toward the inner peripheral side in the axial other side surface of the first flange 31 constitutes the piston rod second sealing portion 312. That is, the axial one side surface of the first flange 31 obliquely downward toward the inner peripheral side constitutes the piston rod second sealing portion 312. Corresponding to the main body sealing portion 812, at least a part of the piston rod second sealing portion 312 is tapered obliquely downward toward the inner peripheral side. In the present embodiment, the piston rod second sealing portion 312 is located at a position on the outer peripheral side in the axial other side surface of the first flange 31.

[0090] In this embodiment, the piston rod first sealing portion 311 and the piston rod second sealing portion 312 are opposite surfaces of the outer circumferential side portion of the first flange 31. By providing the piston rod first sealing portion 311 and the piston rod second sealing portion 312 in the first flange 31, the multiple sealing function can be achieved with a simple structure.

[0091] A first cylindrical portion 92 extending downward can be provided at the lower end of the cylinder head 90, and a second cylindrical portion 82 extending upward can be provided at the outer periphery of the main body portion 81 of the liquid blocking mechanism 80. In the axial direction, the first cylindrical portion 92 is located at a position further outward than the cylinder head sealing portion 91. In the axial direction, the first cylindrical portion 92 is located further outward than the first flange 31 (piston rod 30) and further inward than the upper portion 21 (cylinder 20). In the axial direction, the second cylindrical portion 82 is located further outward than the first flange 31 (piston rod 30) and further inward than the upper portion 21 (cylinder 20).

[0092] In the locked state of the pressing pump, the lower end of the first cylindrical portion 92 and the upper end of the second cylindrical portion 82 cooperate to seal between the liquid blocking mechanism 80 and the cylinder head 90. For example, the first cylindrical portion 92 is fitted to the outer circumferential side of the second cylindrical portion 82. In addition, in the case where the locked state is released, at least when the pressing head 10 is pressed or the pressing head 10 is returned, the first cylindrical portion 92 and the second cylindrical portion 82 are separated. The above-mentioned balance passage passes between the first cylindrical portion 92 and the second cylindrical portion 82 that are separated from each other.

[0093] In addition, a liquid blocking mechanism protrusion 83 protruding toward the outer circumferential side can be provided in the liquid blocking mechanism 80. The liquid blocking mechanism protrusion 83 protrudes, for example, from the outer surface of the second cylindrical portion 82 and is capable of reciprocating in the axial direction within the gap 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 can enter the upper portion 21 of the cylinder 20 through the hollow portion L of the cylinder 20.

[0096] The container using the pressing pump 100 is carried in the locked state of the pressing pump 100, and since the sealing mechanisms (see FIG. 2) 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, respectively, even if the posture of the container is changed during the carrying, the liquid in the container and the upper portion of the piston rod 30 can be prevented from contacting each other. Figure 3b 、 Figure 3c

[0097] ​To unlock the lock head 10, the user rotates the pressure head 10 relative to the sleeve 40. In this process, the helical flange 32 interacts with the groove 811, causing the liquid blocking mechanism 80 provided on the elastic return mechanism 50 to move downward relative to the piston rod 30. When the lock head state is released, the pressing pump 100 becomes a ready-to-use state, and the user pumps the product in the container by pressing the pressure head 10 downward. The hollow portion L is provided to balance the air pressure. When the container generates negative pressure during pressing use, external air enters the container through the hollow portion to supplement.

[0098] In addition, the sleeve 40 or the cylinder head 90 of the pressing pump and the piston rod 30 are provided with a second sealing mechanism (cylinder head sealing portion 91 and piston rod first sealing portion 311), which can prevent liquid from leaking out of the upper portion 21 of the cylinder 20 in the ready-to-use state.

[0099] <Second Embodiment>

[0100] Figure 11 A perspective view of a pressing pump 200 according to a second embodiment of the present application is shown, showing a lock head state of the pressing pump. Figure 12 A perspective view of a cylinder 220 of the pressing pump 200 is shown. Hereinafter, mainly the differences from the first embodiment described above will be described, and sometimes the same reference numerals are used for the same constituent elements as those of the above-described embodiments, and the repeated description is omitted. Unless otherwise described in the following or in conflict with other technical features, the features described in the first embodiment are also applicable to the second embodiment, and detailed description is omitted here.

[0101] In this embodiment, the pressing pump 200 includes a pressure head 10, a cylinder 220, a piston rod 30, a sleeve 40, and an elastic return mechanism 50. The cylinder 220 includes an upper portion 221, a lower portion 22 located below and smaller in 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 in 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 has a ring-shaped portion 2213 connecting the plurality of wall portions 2211, 2212 above the plurality of wall portions 2211, 2212. The hollow portion L is formed between circumferentially adjacent wall portions 2211, 2212.

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

[0104] The specific embodiments of the present application are described above, but those skilled in the art will understand that the above specific embodiments do not constitute a limitation on the present application, and various modifications can be made on the basis of the above disclosure without departing from the scope of the present application.

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 through 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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