Liquid bottle

Abstract

The utility model provides a liquid bottle, and belongs to the technical field of liquid containers. The problem that an existing liquid bottle is strenuous in instillation operation and the like is solved. The liquid bottle comprises an elastic inner container, the outer side of the inner container is sleeved with a cylindrical shell, the top of the inner container is fixed to the shell, a pressing cap capable of moving in the axial direction of the shell is arranged at the bottom of the shell, a reset spring is connected between the pressing cap and the shell, and a tooth column capable of moving towards the top of the inner container in a one-way mode is fixed to the bottom of the inner container. The tooth column is provided with a plurality of ratchets arranged in the axial direction of the shell, and the pressing cap is provided with pawls meshed with the ratchets. The liquid bottle is labor-saving in instillation operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid containers and relates to a liquid bottle. Background Art

[0002] Liquid bottles are used to store liquid medicines. When used to store eye drops, they are called eye drop bottles and are widely used due to their portability and ease of use. When in use, the liquid medicine is generally squeezed out of the bottle body for dripping.

[0003] In order to achieve quantitative dripping, the structure of the liquid bottle is modified. For example, a plastic packaging bottle for eye drops disclosed in Chinese patent literature [Publication No.: CN 108743373B] includes an outer bottle body. A silica gel inner bladder capable of contracting along the length direction is installed inside the outer bottle body. The upper end of the silica gel inner bladder is connected to a rigid connector, and a spiral extrusion part is connected to the rigid connector; an internal thread is formed on the inner wall of the outer bottle body, and a spiral block is formed at the lower end of the outer wall of the spiral extrusion part to cooperate with the internal thread to make the spiral extrusion part rotate and move downward. Ratchet teeth are formed on the inner wall of the spiral extrusion part; a button part is inserted into the spiral extrusion part, and a ratchet pawl part is formed at the lower end of the outer wall of the button part to cooperate with the ratchet teeth to make the spiral extrusion part perform a one-way rotational movement; a guiding groove inclined clockwise is formed at the upper end of the outer bottle body, and a guiding block is formed on the outer wall of the button part to make the button part rotate and move downward clockwise along the guiding groove.

[0004] When using the above-mentioned plastic packaging bottle for eye drops, hold the outer bottle body with the right hand, press the button part with the right thumb. The button part slides and cooperates with the inclined guiding groove on the upper part of the outer wall of the outer bottle body, so that while the button part moves downward, it rotates clockwise by an angle. The ratchet pawl part at the lower end of the button part drives the spiral extrusion part to rotate clockwise through the ratchet teeth. The spiral extrusion part moves downward relative to the outer bottle body through thread cooperation, so that the rigid connector squeezes the silica gel inner bladder, and a quantitative amount of liquid medicine drips out of the eye drop bottle through the inner dropper and the dropper head. Then the user releases the button part with the right thumb, and the return spring bounces the button part counterclockwise along the guiding groove back to the initial position. Using the one-way characteristics of the ratchet pawl part and the ratchet teeth, the spiral extrusion part does not move. In this way, as the number of dripping times increases, the spiral extrusion part and the rigid connector move downward continuously, and the return spring stretches continuously, that is, the compression amount of the return spring decreases continuously, resulting in a smaller elastic force of the return spring on the button part in the later stage of use, making the reset of the button part gradually weak. In order to ensure the smooth reset of the button part in the later stage of use, the initial compression amount of the return spring is often increased, which results in a large pressing resistance and laborious pressing operation in the initial stage of use. Moreover, during the pressing process, in addition to overcoming the elastic force of the return spring and the resistance of the inner bladder, it is also necessary to overcome the rotational resistance of the button part and the rotational resistance of the spiral extrusion part. Therefore, the dripping operation of the above-mentioned plastic packaging bottle for eye drops is relatively laborious.

[0005] To reduce resistance and make the pressing operation labor-saving, the common method is to reduce the friction coefficient, such as adding lubricant or improving the processing accuracy to reduce the surface roughness. However, these will all increase the cost. Summary of the Utility Model

[0006] The purpose of the present utility model is to address the above-mentioned problems existing in the prior art, and propose a liquid bottle, which solves the technical problem that the drip operation of the existing liquid bottle is relatively laborious.

[0007] The purpose of the present utility model can be achieved by the following technical solutions:

[0008] A liquid bottle includes an elastic inner liner. A cylindrical outer shell is sleeved outside the inner liner. The top of the inner liner is fixed to the outer shell. A pressing cap capable of moving axially along the outer shell is provided at the bottom of the outer shell. It is characterized in that a return spring is connected between the pressing cap and the outer shell. A toothed column capable of moving unidirectionally towards the top of the inner liner is fixed at the bottom of the inner liner. A plurality of ratchet teeth arranged axially along the outer shell are provided on the toothed column. A ratchet pawl meshing with the ratchet teeth is provided on the pressing cap.

[0009] The inner liner is filled with liquid medicine. When dripping, invert the liquid bottle, hold the outer shell with one hand and press the pressing cap towards the top direction of the outer shell with fingers. Since the two ends of the return spring are respectively connected to the outer shell and the pressing cap, the outer shell remains stationary while the pressing cap moves, and the return spring deforms to generate elastic potential energy. At the same time, the pressing cap drives the toothed column to move towards the top of the inner liner through the meshing of the ratchet pawl with one of the ratchet teeth. The bottom of the inner liner approaches the top, causing the inner liner to be compressed and the liquid medicine to be extruded for dripping. After the liquid medicine is finished, release the pressing cap. Under the elastic force of the return spring, the pressing cap moves reversely to reset. The toothed column moves unidirectionally, the position of the toothed column remains unchanged, and the ratchet pawl moves and resets with the pressing cap. After the ratchet pawl resets, it can mesh with another ratchet tooth at an axial position.

[0010] When pressing the pressing cap, neither the pressing cap nor the toothed column needs to rotate. Only the elastic force of the return spring and the resistance of the inner liner need to be overcome. Compared with the prior art, there is no need to overcome the rotational resistance brought by rotation. At the same time, since the position of the outer shell remains unchanged, the length of the return spring remains unchanged after each reset of the pressing cap. The initial elastic force of the return spring is set to a smaller value. Compared with the prior art, the elastic force of the return spring that needs to be overcome during pressing is also reduced. Therefore, the drip operation of this liquid bottle is labor-saving.

[0011] In the above-mentioned liquid bottle, a abutment seat is provided on the inner side surface of the outer shell. The pressing cap has an outer cylinder and an inner cylinder both arranged axially along the outer shell. The outer cylinder is inserted into the outer shell. The inner cylinder passes through the abutment seat. The toothed column is inserted into the inner cylinder. The ratchet pawl is provided on the inner cylinder. The ratchet teeth are provided on the outer side surface of the toothed column.

[0012] The arrangement of the outer cylinder and the inner cylinder provides the pressing cap with double guidance when it moves in the outer shell, so that the pressing cap moves in an accurate direction, reduces the resistance increase caused by the displacement of the pressing cap, and is conducive to making the pressing cap pressing operation effortless. The tooth column has a guiding and positioning function when inserted in the inner cylinder, so that the tooth column maintains an axial direction when moving, so that the ratchet on the tooth column and the ratchet on the pressing cap are stably engaged, and the dripping operation is stable; and it can also reduce the resistance increase caused by the displacement of the tooth column, which is conducive to making the pressing cap pressing operation effortless.

[0013] In the above-mentioned liquid bottle, each ratchet tooth is in the shape of a circular ring, the top of the inner cylinder is provided with a plurality of elastic feet evenly arranged along the circumferential direction, and the top of each elastic foot is provided with the ratchet claw.

[0014] The ratchet and the pawl are in an interference state when they are engaged. During the process of resetting the pressure cap, the ratchet pushes the pawl outward, causing these elastic feet to open outward to generate elastic potential energy. When the pressure cap is reset, these elastic feet retract inward under the action of elastic force, and the pawl can engage with the next ratchet again. The pawl is arranged at the top of the elastic foot to increase the length of the force arm, thereby reducing the resistance when pushing the pawl open. This can appropriately reduce the reset elastic force of the reset spring, thereby reducing the elastic force of the reset spring that needs to be overcome when pressing the pressure cap, which is conducive to saving effort in the instillation operation. In addition, this arrangement can also make the tooth column evenly stressed in the circumferential direction, so that the instillation process can be carried out stably, and can also reduce the increase in resistance caused by uneven circumferential force on the tooth column, which is conducive to saving effort in the pressing operation of the pressure cap.

[0015] In the above-mentioned liquid bottle, all the elastic feet are inserted into the abutment seat.

[0016] The abutment seat limits the elastic foot in radial direction. During the resetting process of the pressure cap, the inner cylinder moves toward the bottom and the pawl approaches the abutment seat. The abutment seat also has the function of forcing the elastic foot to close, ensuring that the pawl is engaged with the next ratchet.

[0017] In the above-mentioned liquid bottle, the return spring is located between the outer cylinder and the inner cylinder and abuts against the abutment seat.

[0018] The return spring is limited between the outer cylinder and the inner cylinder, so that the return spring maintains a stable position during use, so that the return process proceeds smoothly. At the same time, it can also reduce the increase in resistance caused by the deviation of the return spring, which is conducive to making the pressing operation of the pressure cap labor-saving.

[0019] In the above-mentioned liquid bottle, the axial length of a single tooth of all ratchets is the same, and the outer side surface of the inner cylinder body has a shoulder, which is located below the abutment seat and can abut against the abutment seat. Under the action of the elastic force of the return spring, the shoulder is separated from the abutment seat and there is a spacing distance between the two, and the spacing distance is equal to or slightly greater than the axial length of a single tooth.

[0020] Press the pressure cap so that the shoulder abuts against the abutment seat. At this time, the axial movement of the pressure cap is equal to or slightly greater than the axial length of a single tooth. After the pressure cap is reset, a single tooth axial length or slightly greater than a single tooth axial length is restored between the shoulder and the abutment seat, and the ratchet pawl meshes with the next ratchet tooth. In this way, each press squeezes the inner bladder by a single tooth axial length, and the amount of liquid medicine extruded is the same, realizing quantitative drip infusion. Moreover, the compression amount of the reset spring for each press is equal to or slightly greater than the axial length of a single tooth, making the operation of the pressure cap labor-saving.

[0021] In the above liquid bottle, a protruding limit projection is provided on the outer side surface of the outer cylinder, and a protruding abutment projection is provided on the inner side surface of the housing. The limit projection is located above the abutment projection and abuts against the abutment projection. The abutment projection has a limiting effect on the limit projection to prevent the pressure cap from falling out of the housing, making the structure of the hydraulic bottle stable and at the same time making the drip infusion operation convenient.

[0022] In the above liquid bottle, a guide hole is provided on the bottom end surface of the tooth column, and a positioning column arranged axially along the housing is fixed on the pressure cap, and the positioning column is inserted into the guide hole.

[0023] The positioning column has a guiding and positioning effect on the movement of the tooth column, keeping the tooth column axial during movement, making the engagement between the ratchet teeth on the tooth column and the ratchet pawls on the pressure cap stable, and making the drip infusion operation stable. Moreover, it can also reduce the increase in resistance caused by the offset of the tooth column, which is beneficial to making the operation of pressing the pressure cap labor-saving.

[0024] In the above liquid bottle, there is an annular gap between the inner side surface of the housing and the outer side surface of the inner bladder. The setting of the annular gap can avoid interference between the inner bladder and the housing, avoid generating additional resistance when the inner bladder is compressed, and is beneficial to making the drip infusion operation labor-saving.

[0025] In the above liquid bottle, the inner bladder is a spring bottle. The spring bottle has elasticity and a stable structure, which is convenient to use.

[0026] In the above liquid bottle, a drip head in a normally closed state is connected to the top of the inner bladder. The drip head includes a liquid outlet plug made of an elastic material, and an elastic sealing film that can be opened when the pressure inside the inner bladder increases is provided in the central hole of the liquid outlet plug. Press the pressure cap, the inner bladder is compressed to increase its internal pressure, the elastic sealing film on the liquid outlet plug opens, and the liquid medicine in the inner bladder flows out from the liquid outlet plug. After releasing the pressure cap, the elastic sealing film on the liquid outlet plug closes again, the inner bladder is sealed, preventing the liquid medicine in the inner bladder from being contaminated. At the same time, the inner and outer pressures of the inner bladder are balanced and the shape remains unchanged, so that the position of the tooth column remains unchanged, and the ratchet pawl moves and resets with the pressure cap.

[0027] Compared with the prior art, the present utility model has the following advantages:

[0028] 1. A return spring is arranged between the outer shell and the pressing cap. A toothed column that moves unidirectionally is arranged on the inner container. A plurality of ratchet teeth are arranged along the axial direction of the outer shell on the toothed column. A ratchet pawl that meshes with the ratchet teeth is arranged on the pressing cap, avoiding rotational resistance and reducing the resistance of the return spring. When the pressing cap is pressed, the resistance is small, making the drip operation of this liquid bottle labor-saving.

[0029] 2. The drip head in this liquid bottle is in a normally closed state, ensuring the safety of using the liquid medicine in the inner container, and at the same time keeping the position of the toothed column unchanged when the pressing cap returns.

[0030] 3. When the pressing cap of this liquid bottle is pressed once, the toothed column extends by the axial length of a single tooth, and quantitative dripping can be achieved.

[0031] 4. The structure of this liquid bottle is simple and convenient for processing and manufacturing. Description of the Drawings

[0032] Figure 1 is the front view of the first embodiment of this liquid bottle when placed upright and not in use.

[0033] Figure 2 is the cross-sectional view of the first embodiment of this liquid bottle when placed upright and not in use.

[0034] Figure 3 is the cross-sectional view of the pressing cap in the first embodiment of this liquid bottle.

[0035] Figure 4 is the cross-sectional view of the first embodiment of this liquid bottle during the sixth drip.

[0036] Figure 5 is the cross-sectional view of the first embodiment of this liquid bottle when reset after the sixth drip.

[0037] Figure 6 is the cross-sectional view of the fifth embodiment of this liquid bottle when reset after the sixth drip.

[0038] In the figure, 1. Outer shell; 1a. Upper shell; 1b. Lower shell; 1b1. Abutting seat; 1b2. Insertion hole; 1b3. Abutting protrusion; 2. Inner container; 2a. Clamping portion; 3. Drip head; 3a. Inner cover; 3b. Drip cover; 3c. Liquid outlet plug; 3c1. Elastic sealing film; 3d. Flow-blocking cap; 4. Outer cover; 5. Toothed column; 5a. Ratchet teeth; 5b. Clamping groove; 5c. Guide hole; 6. Pressing cap; 6a. Outer cylinder; 6a1. Inserting pin; 6a2. Limiting protrusion; 6b. Inner cylinder; 6b1. Elastic foot; 6b2. Ratchet pawl; 6b3. Shoulder; 7. Return spring; 8. Positioning column; 8a. Connecting portion; 9. Annular gap; 10. Anti-backward part; 10a. Elastic sheet; 10a1. Anti-backward ratchet pawl 10a1; L0. Axial length of a single tooth; δ. Spacing distance. Detailed Implementation Manner

[0039] The following are specific embodiments of the present utility model and, in conjunction with the accompanying drawings, further describe the technical solutions of the present utility model. However, the present utility model is not limited to these embodiments.

[0040] Embodiment 1

[0041] As Figure 1 And Figure 2 shown, a liquid bottle includes a housing 1, an inner bladder 2, a drip head 3, an outer cap 4, a toothed column 5, a compression cap 6, a return spring 7, and a positioning column 8. The housing 1 is cylindrical, preferably cylindrical. The inner bladder 2 is located inside the housing 1, and there is an annular gap 9 between the inner side surface of the housing 1 and the outer side surface of the inner bladder 2. The inner bladder 2 is elastic. The inner bladder 2 is a spring bottle made of medical plastic [such as LDPE], and the spring bottle is filled with a liquid medicine. The top of the inner bladder 2 is threadedly connected to the top of the housing 1, and the bottom of the inner bladder 2 is closed and provided with a clamping portion 2a.

[0042] As Figure 2As shown, the drip head 3 is fixedly connected to the top of the outer shell 1 and is connected to the inner liner 2. The drip head 3 is in a normally closed state and can be opened when the pressure in the inner liner 2 increases. The drip head 3 includes an inner cover 3a, a drip cover 3b, a liquid outlet plug 3c and a flow blocking cap 3d. The inner cover 3a is cylindrical, the drip cover 3b is cap-shaped. The lower end of the inner cover 3a is fixed to the top of the outer shell 1, and the upper end of the inner cover 3a is fixed to the drip cover 3b. The inner cover 3a has a partition portion in the shape of an annular plate. On the inner edge of the partition portion, there is a cylindrical inner cylinder protruding upward. Outside the inner cylinder on the partition portion, there is a cylindrical outer cylinder protruding upward. A drip hole is opened at the center of the drip cover 3b, and the lower end of the drip cover 3b is sleeved on the outer cylinder and fixed. On the partition portion of the inner cover 3a, there is a downward protruding annular fixing ring. The inner hole of the fixing ring is communicated with the inner hole of the inner cylinder, and the flow limiting cap is fixed in the fixing ring. The top of the inner liner 2 extends out of the outer shell 1 and is inserted into the inner cover 3a and fixed. The fixing ring is inserted into the bottle mouth at the top of the inner liner 2. A spiral channel is provided between the outer side surface of the flow limiting cap and the inner side surface of the fixing ring. The spiral channel communicates the inner cavity of the inner liner 2 and the inner hole of the inner cylinder. The liquid outlet plug 3c is made of medical rubber material. There is a fixing ring on the outer side surface of the liquid outlet plug 3c. The liquid outlet plug 3c is inserted into the drip cover 3b. The fixing ring clamps and fixes between the drip cover 3b and the inner cylinder. The central hole of the liquid outlet plug 3c is aligned with the drip hole and communicated with the inner hole of the inner cylinder. There is an elastic sealing film 3c1 in the central hole of the liquid outlet plug 3c. An opening slit is provided on the elastic sealing film 3c1 to form several elastic sealing flaps that abut and seal against each other. The opening slit is in the shape of a straight line or a Y shape or a cross shape. The elastic sealing film 3c1 is in a normally closed state, making the drip head 3 in a normally closed state. When the pressure in the inner liner 2 increases, the elastic sealing flaps of the elastic sealing film 3c1 are pressed open, so that the inner cavity of the inner liner 2 is communicated with the outside. The outer cover 4 is sleeved outside the drip head 3. There are air holes and a sealing convex column inserted into the drip hole on the outer cover 4. The sealing convex column is embedded into the drip hole to block the drip hole, keeping the drip head 3 in a sealed state. This is also beneficial to prevent the outer shell 1 from moving downward due to its own gravity when the liquid bottle is placed upright. When dripping, the outer cover 4 needs to be removed.

[0043] As Figure 2 and Figure 3As shown, the tooth column 5 is fixed to the bottom of the inner tank 2 and can move unidirectionally towards the top of the inner tank 2. A clamping groove 5b is formed on the top surface of the tooth column 5, and the clamping portion 2a at the bottom of the inner tank 2 is embedded into the clamping groove 5b to form a clamping fixation. A plurality of ratchet teeth 5a arranged in sequence along the axial direction are provided on the outer side surface of the tooth column 5. All the ratchet teeth 5a are annular, and the axial length L0 of a single tooth of all the ratchet teeth 5a is the same. The number of ratchet teeth 5a and the axial length L0 of a single tooth are set according to the requirements of the number of instillations and the instillation volume. The bottom of the outer shell 1 is open and is inserted with a pressing cap 6 that can move axially along the outer shell 1. The pressing cap 6 is provided with a pawl 6b2 that can engage with the ratchet teeth 5a at different axial positions in sequence. An abutting seat 1b1 is arranged on the inner side surface of the outer shell 1. The pressing cap 6 is provided with an outer cylinder 6a and an inner cylinder 6b that are both arranged along the axial direction of the outer shell 1. Both the outer cylinder 6a and the inner cylinder 6b are cylindrical. The inner cylinder 6b is located inside the outer cylinder 6a. The top of the outer cylinder 6a is provided with several insertion feet 6a1 arranged evenly along the circumferential direction of the outer cylinder 6a. The insertion feet 6a1 are arc-shaped, and there are two, three, four, etc. The abutting seat 1b1 is provided with insertion holes 1b2 corresponding to the insertion feet 6a1 one by one. The outer cylinder 6a is inserted into the bottom of the outer shell 1, and the insertion feet 6a1 are inserted into the corresponding insertion holes 1b2. The top of the inner cylinder 6b is provided with several elastic feet 6b1 arranged evenly along the circumferential direction of the inner cylinder 6b. The elastic feet 6b1 are arc-shaped, and there are two, three, four, etc. The elastic feet 6b1 of the inner cylinder 6b pass through the central hole of the abutting seat 1b1. The tooth column 5 is inserted into the inner cylinder 6b. The pawl 6b2 is arranged at the top end of the elastic feet 6b1 and faces the tooth column 5. A guiding hole 5c is formed on the bottom end surface of the tooth column 5. A positioning column 8 is arranged along the axial direction of the outer shell 1 and is inserted into the guiding hole 5c. The outer side surface of the positioning column 8 is in clearance fit with the hole wall surface of the guiding hole 5c. A connecting portion 8a is arranged on the outer side surface of the bottom end of the positioning column 8. The connecting portion 8a is embedded into the central hole of the pressing cap 6 and is clamped and fixed.

[0044] As Figure 2 and Figure 3As shown, both ends of the return spring 7 are respectively connected to the outer shell 1 and the compression cap 6. The return spring 7 is located between the outer cylinder 6a and the inner cylinder 6b and abuts against the abutment seat 1b1 and the compression cap 6. The return spring 7 is a compression spring, and the compression spring is sleeved on the outside of the inner cylinder 6b. A limiting protrusion 6a2 protruding outward is provided on the pin 6a1 of the outer cylinder 6a, and an abutting protrusion 1b3 protruding inward is provided on the inner side surface of the outer shell 1. The limiting protrusion 6a2 is located above the abutting protrusion 1b3, and under the action of the elastic force of the return spring 7, the limiting protrusion 6a2 abuts against the abutting protrusion 1b3. A shoulder 6b3 is provided on the outer side surface of the inner cylinder 6b below the elastic foot 6b1. The shoulder 6b3 is located below the abutment seat 1b1 and can abut against the abutment seat 1b1. Under the action of the elastic force of the return spring 7, the shoulder 6b3 is separated from the abutment seat 1b1 and there is a spacing distance δ between them. The spacing distance δ is equal to the axial length L0 of a single tooth. To facilitate the installation of the inner liner 2, the outer shell 1 includes an upper shell 1a and a lower shell 1b that are fixedly separated. The abutment seat 1b1 and the limiting protrusion 6a2 are both provided on the inner side surface of the lower shell 1b.

[0045] As Figure 4 shown, during infusion, remove the outer cover 4, invert the liquid bottle, and then hold the outer shell 1 with one hand and press the compression cap 6 with the fingers towards the top of the outer shell 1; since both ends of the return spring 7 are respectively connected to the outer shell 1 and the compression cap 6, the outer shell 1 remains stationary while the compression cap 6 moves, and the return spring 7 is compressed to generate elastic potential energy. At the same time, the compression cap 6 drives the tooth column 5 to move towards the top of the inner liner 2 by engaging the ratchet pawl 6b2 with one of the ratchet teeth 5a; after pressing, the shoulder 6b3 abuts against the abutment seat 1b1, and the compression cap 6 moves an axial length L0 of a single tooth; the inner liner 2 is compressed to increase the internal pressure of the inner liner 2, and the sealing elastic membrane of the liquid outlet plug 3c on the infusion head 3 opens to allow the medicinal liquid to drip out from the infusion hole. Then release the compression cap 6. As Figure 5 shown, under the action of the elastic force of the return spring 7, the compression cap 6 moves reversely to reset. Since the pressure in the inner liner 2 returns after the medicinal liquid is discharged, the elastic sealing membrane 3c1 of the liquid outlet plug 3c on the infusion head 3 closes again, and the inner liner 2 is in a sealed state. The inner and outer pressures of the inner liner 2 are balanced and the shape remains unchanged, so that the position of the tooth column 5 remains stationary, and the ratchet pawl 6b2 moves and resets with the compression cap 6. After the ratchet pawl 6b2 resets, it engages with the ratchet tooth 5a at the next axial position. Press the compression cap 6 again for the next infusion, and repeat in sequence until the medicinal liquid cannot be extruded. When not in infusion, re-cover the outer cover 4 onto the infusion head 3, and embed the sealing convex column on the outer cover 4 into the infusion hole to block the infusion hole to prevent accidental pressing of the compression cap 6 from causing the medicinal liquid to be extruded.

[0046] When pressing, neither the pressure cap 6 nor the tooth post 5 needs to rotate. Only the elastic force of the return spring 7 and the resistance of the inner container 2 need to be overcome. Compared with the prior art, there is no need to overcome the rotational resistance caused by rotation. At the same time, since the position of the outer shell 1 remains unchanged, the length of the return spring 7 remains the same after each reset of the pressure cap 6. The initial elastic force of the return spring 7 can be set to a smaller value. Compared with the prior art, the elastic force of the return spring 7 that needs to be overcome during pressing is also reduced. Therefore, the infusion operation of this liquid bottle is labor-saving. Each press squeezes the inner container 2 by a single-tooth axial length L0, and the amount of the extruded liquid medicine is the same, realizing quantitative infusion. Moreover, the compression amount of the return spring 7 for each press is a single-tooth axial length L0, which is also beneficial to making the operation of the pressure cap 6 labor-saving. In addition, the structure of this liquid bottle is relatively simple, convenient for manufacturing and processing, and the total height of the liquid bottle remains unchanged after the pressure cap 6 is reset.

[0047] Embodiment Two

[0048] The interval distance δ between the shoulder 6b3 and the abutment seat 1b1 is slightly greater than a single-tooth axial length L0, that is, the difference between the two is not greater than one-fourth of a single-tooth axial length L0. This can avoid the situation that the pawl 6b2 cannot mesh with the ratchet teeth 5a at different axial positions caused by processing errors and assembly errors. Assuming that a single-tooth axial length L0 is 2.0 mm, the difference between the interval distance δ and a single-tooth axial length L0 can be 0.01 mm - 0.50 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, etc. Other structures are the same as those in Embodiment One.

[0049] Embodiment Three

[0050] In order to avoid the downward movement of the outer shell 1 when the liquid bottle is placed upright, the height of the outer shell 1 can be lengthened so that the bottom end surface of the outer shell 1 is flush with the bottom end surface of the pressure cap 6. Other structures are the same as those in Embodiment One.

[0051] Embodiment Four

[0052] A discharge valve is installed below the infusion hole in the drip cap 3b. The discharge valve closes the infusion hole of the drip cap 3b. After the liquid bottle is inverted, when the internal pressure in the inner container 2 increases, the liquid in the inner container 2 acts on the top of the discharge valve to push the discharge valve open, thereby opening the infusion hole of the drip cap 3b to achieve infusion. The structure of the discharge valve can refer to the patent document with the publication number CN104114456A. Other structures are the same as those in Embodiment One.

[0053] Embodiment Five

[0054] As Figure 6As shown, the liquid outlet plug 3c is not provided with an elastic sealing film 3c1 and is in a normally open state. An anti-backward member 10 for preventing the toothed column 5 from moving backward is also fixed on the inner side surface of the outer shell 1. An elastic piece 10a is provided on the anti-backward member 10, and a backstop pawl 10a1 meshing with the ratchet teeth 5a of the toothed column 5 is provided on the elastic piece 10a. When the toothed column 5 moves towards the top of the inner container 2, the ratchet teeth 5a push the backstop pawl 10a1 away. After the compression cap 6 is reset, the backstop pawl 10a1 meshes with another ratchet tooth 5a to ensure the one-way movement of the toothed column 5. The backstop pawl 10a1 can also be hinged on the outer shell 1. A torsion spring is provided at the hinge of the backstop pawl 10a1, and a limiting portion for limiting the swing angle of the backstop pawl 10a1 is provided on the outer shell 1. Other structures are the same as those in the first embodiment.

[0055] Embodiment Six

[0056] The connection position of the return spring 7 is different from that in the first embodiment. A retaining edge located below the outer shell 1 is provided on the outer side surface of the compression cap 6. The two ends of the return spring 7 respectively abut against the retaining edge and the bottom end surface of the outer shell 1. Other structures are the same as those in the first embodiment.

[0057] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A liquid bottle, comprising an elastic inner liner (2), a cylindrical outer shell (1) is mounted on the outer side of the inner liner (2), the top of the inner liner (2) is fixed to the outer shell (1), and the bottom of the outer shell (1) is provided with a pressure cap (6) that can move axially along the outer shell (1), characterized in that: A return spring (7) is connected between the pressing cap (6) and the outer shell (1); a tooth column (5) capable of unidirectional movement toward the top of the inner shell (2) is fixed to the bottom of the inner shell (2); the tooth column (5) has a plurality of ratchet teeth (5a) arranged axially along the outer shell (1); and the pressing cap (6) has a ratchet pawl (6b2) meshing with the ratchet teeth (5a).

2. The liquid bottle according to claim 1, characterized in that: The inner side surface of the outer shell (1) is provided with a support seat (1b1); the pressure cap (6) has an outer cylinder (6a) and an inner cylinder (6b) both arranged along the axial direction of the outer shell (1); the outer cylinder (6a) is inserted into the outer shell (1); the inner cylinder (6b) is inserted into the support seat (1b1); the tooth column (5) is inserted into the inner cylinder (6b); the ratchet (6b2) is arranged on the inner cylinder (6b); and the ratchet (5a) is arranged on the outer side surface of the tooth column (5).

3. The liquid bottle according to claim 2, characterized in that: Each ratchet tooth (5a) is in the shape of a ring. The top of the inner cylinder (6b) is provided with a plurality of elastic feet (6b1) evenly arranged in the circumferential direction. The top of each elastic foot (6b1) is provided with the ratchet claw (6b2).

4. The liquid bottle according to claim 3, characterized in that: All the elastic feet (6b1) are inserted into the abutment seat (1b1).

5. The liquid bottle according to any one of claims 2 to 4, characterized in that: The return spring (7) is located between the outer cylinder (6a) and the inner cylinder (6b) and abuts against the abutment seat (1b1).

6. The liquid bottle according to any one of claims 2 to 4, characterized in that: The single tooth axial length (L0) of all ratchet teeth (5a) is the same, the outer side surface of the inner cylinder (6b) is provided with a stop shoulder (6b3), the stop shoulder (6b3) is located below the abutment seat (1b1) and can abut against the abutment seat (1b1), and under the action of the elastic force of the return spring (7), the stop shoulder (6b3) is separated from the abutment seat (1b1) and there is a spacing distance (δ) between the two, and the spacing distance (δ) is equal to or slightly greater than the single tooth axial length (L0).

7. The liquid bottle according to any one of claims 2 to 4, characterized in that: The outer surface of the outer cylinder (6a) is provided with a protruding limiting protrusion (6a2), and the inner surface of the outer shell (1) is provided with a protruding abutting protrusion (1b3), and the limiting protrusion (6a2) is located above the abutting protrusion (1b3) and abuts against the abutting protrusion (1b3).

8. The liquid bottle according to any one of claims 1 to 4, characterized in that: A guide hole (5c) is provided on the bottom end surface of the tooth column (5), and a positioning column (8) arranged axially along the housing (1) is fixed on the pressure cap (6), and the positioning column (8) is inserted into the guide hole (5c).

9. The liquid bottle according to any one of claims 1 to 4, characterized in that: An annular gap (9) is provided between the inner side surface of the outer shell (1) and the outer side surface of the inner container (2).

10. The liquid bottle according to any one of claims 1 to 4, characterized in that: The top of the inner container (2) is connected to a drip head (3) in a normally closed state, and the drip head (3) comprises a liquid outlet plug (3c) made of elastic material, and a central hole of the liquid outlet plug (3c) has an elastic sealing membrane (3c1) that can be opened when the internal pressure of the inner container (2) increases.

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