A pump head with back-suction effect

Abstract

The present invention discloses a pump head with a back-suction effect, comprising a pressing head, an outer cover, and a handle, wherein the handle is movably connected to the outer cover, the pressing head is connected to one end of the handle, and a storage chamber for storing liquid is formed between the inner surface of the outer cover and the outer surface of the handle, the pressing head comprises a columnar structure extending toward the storage chamber, the columnar structure is inserted in one end of the storage chamber close to the columnar structure, the pressing head comprises a liquid outlet channel, the storage chamber is connected to the liquid outlet channel, when in a pressed state, the columnar structure is used to squeeze the liquid in the storage chamber into the liquid outlet channel, and when in a non-pressed state, the columnar structure sucks the liquid in the liquid outlet channel back into the storage chamber, the present invention adopts the storage chamber to back-suction the liquid in the liquid outlet channel of the pressing head, and the channel for the back-suctioned liquid and the channel for the operation of the pump body itself are independent of each other and do not affect each other.

Description

Technical Field

[0001] The invention relates to the technical field of pump heads, in particular to a pump head with a back-suction effect. Background Art

[0002] In the prior art, after the pump head is used to squeeze the liquid, liquid will remain in the liquid outlet channel of the pump head. Since the liquid outlet channel of the pump head is large, the residual liquid will come into contact with a large amount of air, and the liquid is easily contaminated or oxidized. When people use it next time, the contaminated or oxidized liquid will be squeezed out first, which is not conducive to people's use. In addition, liquid that is easy to solidify will be blocked in the liquid outlet channel of the pump head, and liquid that is not easy to solidify will leak out when the pump head is tilted. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a pump head with a back-suction effect, which can solve the problem of back-suction of liquid in the liquid outlet channel of the pump head.

[0004] The technical solution of the present invention is:

[0005] A pump head with a back-suction effect comprises a push head, an outer cover, and a handle, wherein the handle is movably connected to the outer cover, the push head is connected to one end of the handle, a storage chamber for storing liquid is formed between the inner surface of the outer cover and the outer surface of the handle, the push head comprises a columnar structure extending toward the storage chamber, the columnar structure is inserted at one end of the storage chamber close to the columnar structure, the push head comprises a liquid outlet channel, and the storage chamber is communicated with the liquid outlet channel.

[0006] In the pressed state, the columnar structure is used to be inserted into the storage chamber to reduce the internal space of the storage chamber, so that the pressure inside the storage chamber is greater than the pressure of the liquid outlet channel, so as to squeeze the liquid in the storage chamber into the liquid outlet channel.

[0007] In the non-pressed state, the columnar structure is used to move away from the storage chamber to expand the internal space of the storage chamber, so that the internal pressure of the storage chamber is less than the pressure of the liquid outlet channel, so as to suck the liquid in the liquid outlet channel back into the storage chamber.

[0008] The pressing state refers to an external force acting on the pressing head, causing the pressing head to approach the outer cover, and the pressing head drives the columnar structure to move from an end of the storage chamber close to the pressing head toward an end close to the outer cover to reduce the internal space of the storage chamber.

[0009] Furthermore, the push head also includes a lock slot, and the outer cover is provided with a lock track for moving the lock slot. The lock slot is connected to one end of the push head close to the lock track, and the lock track includes a first point and a second end point. At the position of the first end point, the lock track extends a distance away from the push head, and the lock slot moves within the distance, so that when the lock slot is located at the first end point, the push head is in an unlocked state.

[0010] The unlocked state is when an external force acts on the push head and the push head approaches the outer cover; the locked state is when the lock head slot is located outside the first end point, restricting the push head from moving toward the outer cover.

[0011] Furthermore, a first clamping point is provided at the first end point of the lock track, and a second clamping point is provided at the second end point, and the first clamping point and the second clamping point are respectively used to stably clamp the lock slot at the first clamping point and the second clamping point.

[0012] Furthermore, it also includes a cylinder, a spring, a piston seat and a piston, the end of the handle away from the push head is connected to the piston seat and the piston, one end of the cylinder is connected to the outer cover, and the other end has an opening for external liquid to enter, the handle, spring, piston seat and piston are all arranged in the cylinder, the piston sleeve is arranged on the outside of the piston seat, and the cylinder, piston seat and piston form a liquid suction cavity for sucking external liquid from the opening of the cylinder.

[0013] The handle includes a first liquid channel for liquid to pass through, and the first liquid channel is connected to the liquid outlet channel of the pressing head at one end close to the pressing head. The piston seat includes a second liquid channel opened at one end close to the handle, and the liquid outlet channel of the pressing head, the first liquid channel, and the second liquid channel are connected in sequence.

[0014] The piston seat further comprises at least one hole for connecting the second liquid channel and the liquid suction chamber on the side close to the piston. The side of the piston close to the piston seat closes the hole of the piston seat in a non-pressed state. The side of the piston away from the piston seat abuts against the inner surface of the cylinder. The piston is used to deform in a pressed state to open the hole on the piston seat, allowing external liquid in the liquid suction chamber to enter the piston seat.

[0015] One end of the spring is connected to the piston seat, and the other end is connected to the inner surface of the cylinder. The spring is in a compressed state when pressed, and in a rebound state when not pressed. The spring is used to push the piston seat to make the handle and the button rebound to their original positions.

[0016] In the pressed state, the pressing head is in a state of approaching the piston seat, forcing the handle to push the piston and the piston seat, so that the space of the liquid suction chamber is reduced, and the liquid in the liquid suction chamber is squeezed to the liquid outlet channel of the pressing head.

[0017] In a non-pressed state, the spring is used to release elastic force to push the piston and the piston seat to increase the space of the liquid suction chamber, so that the liquid suction chamber sucks external liquid from the opening of the cylinder.

[0018] Furthermore, a one-way valve is included, which is connected to the opening of the tube. The one-way valve is used to prevent the liquid in the suction chamber from leaving the suction chamber through the opening of the tube in a pressed state, and to allow external liquid to be sucked into the suction chamber in a non-pressed state.

[0019] Furthermore, the one-way valve is a steel ball, which is arranged inside the cylinder near one end of the opening of the cylinder.

[0020] Furthermore, the outer cover has a first air return hole, the barrel has a second air return hole, the barrel and the outer cover have a gap, the first air return hole, the gap between the barrel and the outer cover, and the second air return hole are connected in sequence, so that the air outside the pump body passes through the first air return hole, the gap between the barrel and the outer cover, and the second air return hole in sequence and is discharged into the external bottle; when the piston is in the upper limit position, the second air return hole is closed,

[0021] The upward limit position means that the piston abuts against the outer cover, and the outer cover restricts the piston from continuing to move toward the outer cover.

[0022] Furthermore, a straw is included, one end of which is connected to the opening of the tube, and the other end of which is inserted below the liquid surface of the external liquid.

[0023] Furthermore, the connection between the button head and the handle is a double-layer snap connection.

[0024] Furthermore, the outer cover is connected to the bottle mouth of the external bottle, and a gasket is arranged between the outer cover and the bottle mouth, and the gasket is used to seal the gap between the outer cover and the bottle mouth.

[0025] The beneficial effects of the present invention are as follows: 1. A storage chamber is used to suck back the liquid in the liquid outlet channel of the push head. 2. The channel for sucking back the liquid and the channel for the operation of the pump body are independent of each other and do not affect each other. 3. A new locking structure is provided, and the locking state and the unlocking state can be switched by rotating the push head, which is convenient for use and prevents accidental pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the pressing head.

[0028] Figure 3 It is a schematic diagram of the three-dimensional structure of the outer cover.

[0029] Figure 4 It is a schematic diagram of the structure of the present invention in a non-pressed state.

[0030] Figure 5 It is a schematic diagram of the structure of the present invention in a pressed state.

[0031] In the figure, 1. button; 101. slit groove; 102. first annular protrusion; 103. second annular protrusion; 104. liquid outlet channel; 105. first lock slot; 106. second lock slot; 2. handle; 3. outer cover; 301. first lock track; 302. second lock track; 303. first clamping point; 304. second clamping point; 305. third clamping point; 306. fourth clamping point; 307. first air return hole; gasket; 5. piston; 6. piston seat; 7. cylinder; 71. second air return hole 71; 8. spring; 9. steel ball; 10. straw; 11. storage chamber. DETAILED DESCRIPTION

[0032] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments:

[0033] like Figure 1 As shown, a foam pump with a back-suction effect includes a button 1, a handle 2, an outer cover 3, a gasket 4, a piston 5, a piston seat 6, a cylinder 7, a spring 8, a steel ball 9, and a straw 10.

[0034] The inner side wall of the lower end of the outer cover 3 has an internal thread, which is used to connect with the bottle mouth of an external bottle with a matching external thread. The handle 2 is inserted into the outer cover 3, and the handle 2 can move up and down relative to the outer cover 3. The center of the handle 2 has a channel for liquid to pass through. The upper end of the handle 2 is fixedly connected to the head 1 by a double-layer buckle, such as Figure 1 and Figure 2 As shown, the push head 1 is also provided with a first annular columnar structure 102 extending toward the handle 2, the upper end of the handle 2 is inserted into the first annular columnar structure 102, a step is provided inside the first annular columnar structure 102, the lower end of the step abuts against the upper end of the handle 2, when an external force presses the push head 1 to move downward, the push head 1 can also push the handle 2 to move downward through the step. The push head 1 has a liquid outlet channel 104, the liquid outlet channel 104 is connected to the channel of the handle 2, and the liquid outlet channel 104 of the push head 1 is used to guide the liquid coming out of the channel of the handle 2 to be squeezed out of the pump head.

[0035] A slit groove 101 is dug on the inner side wall of the first annular columnar structure 102 of the press head 1, and a storage chamber 11 is formed between the upper outer surface of the handle 2 and the upper inner surface of the outer cover 3. The upper end of the storage chamber 11 is closed by the lower end of the first annular columnar structure 102 of the press head 1, leaving only the slit groove 101 of the first annular columnar structure 102, so that the storage chamber 11 is connected to the liquid outlet channel 104 of the press head 1 through the slit groove 101, and the slit groove 101 constitutes the only channel connecting the storage chamber 11 with the liquid outlet channel 104. The function of the storage chamber 11 is that when the pressing head 1 is pressed downward by an external force, the first annular columnar structure 102 of the pressing head 1 will be inserted into the storage chamber 11, so that the space of the storage chamber 11 is reduced, that is, in principle, to increase the pressure inside the storage chamber 11, if there is liquid in the storage chamber 11, the liquid will be discharged from the storage chamber 11 to the liquid outlet channel 104 of the pressing head 1 through the slit groove 101. When the storage chamber 11 is removed from the external force and moves upward to recover, the first annular columnar structure 102 of the pressing head 1 gradually moves upward, so that the space of the storage chamber 11 is increased, the pressure in the storage chamber 11 is reduced, and the liquid retained in the liquid outlet channel 104 of the pressing head 1 is sucked into the storage chamber 11 through the slit groove 101. The storage chamber 11 is an independent space, which absorbs the liquid retained in the liquid outlet channel 104 of the pressing head 1 back into the storage chamber 11, thereby reducing the risk of the liquid retained in the liquid outlet channel 104 of the pressing head 1 accidentally flowing out of the pressing head 1 and causing pollution, and also reducing the large-scale oxidation of the liquid in the liquid outlet channel 104 or the adsorption of bacteria.

[0036] The present invention also includes a first lock structure and a second lock structure, such as Figure 2 and Figure 3 As shown, the first lock structure includes a first lock slot 105, a first lock track 301, a first clamping point 303, and a second clamping point 304. The second lock structure includes a second lock slot 106, a second lock track 302, a third clamping point 305, and a fourth clamping point 306. The push head 1 also includes a second annular columnar structure 103. The second annular columnar structure 103 extends two protrusions outward to form a first lock slot 105 and a second lock slot 106. In terms of position, the first lock slot 105 is arranged on the side of the second annular columnar structure 103 close to the liquid outlet of the push head 1, and the second lock slot 106 is arranged on the side of the second annular columnar structure 103 away from the liquid outlet of the push head 1, so that the first lock slot 105 and the second lock slot 106 can form two symmetrical locking points when the push head 1 is rotated, and the locking effect is more stable. Figure 2 and Figure 3The inner wall of the outer cover 3 near the end of the button 1 is provided with a first lock track 301 and a second lock track 302. The lengths of the first lock track 301 and the second lock track 302 determine the angle at which the button 1 needs to be twisted. The first lock track 301 has a first clamping point 303 and a second clamping point 304. The first clamping point 303 is set at one end of the first lock track 301, and the second clamping point 304 is set at the other end of the first lock track 301. Similarly, a third clamping point 305 is set at one end of the second lock track 302, and a fourth clamping point 306 is set at the other end of the second lock track 302. The first lock track 301 is dug downward at the position of the first clamping point 303, and the second lock track 302 is dug downward at the position of the third clamping point 305, so that the first lock slot 105 can move downward at the first clamping point 303, and the second lock slot 106 can move downward at the second clamping point 304. The above structure is designed to specifically function as follows: when the push head 1 is connected to the upper end of the outer cover 3, the first lock slot 105 of the push head 1 is inserted into the first lock track 301, and the second lock slot 106 is inserted into the second lock track 302. When the push head 1 rotates, the first lock slot 105 and the second lock slot 106 can rotate along the first lock track 301 and the second lock track 302 respectively. When the first lock slot 105 rotates to the first clamping point 303, the first clamping point 303 is clamped in the first lock slot 105, so that the first lock slot 105 can be stably fixed at the first clamping point. At this time, the second locking groove 106 is also stabilized at the third locking point 305. Since the first locking point 303 has a first locking track 301 dug downwards, and the third locking point 305 has a second locking track 302 dug downwards, it is required that when the first locking groove 105 is at the first locking point 303 and the second locking groove 106 is at the third locking point 305, the push head 1 is allowed to move downward, that is, external force is allowed to press the push head 1 to move downward to operate the pump head and squeeze out the liquid. At this time, the state of the push head 1 is unlocked. On the contrary, when the first lock slot 105 is not at the first clamping point 303, and the second lock is not at the third clamping point 305, the first lock track 301 will limit the first lock slot 105 from moving downward, and the second lock track 302 will limit the second lock slot 106 from moving downward. At this time, it is in a locked state, that is, even if an external force presses the button 1, the button 1 will not move downward, which plays a role in preventing the button 1 from being pressed by mistake. In addition, when the button 1 rotates to the second clamping point 304 and clamps into the first lock slot 105, and the fourth clamping point 306 clamps into the second lock slot 106, the button 1 can be stabilized in a locked state, and the button 1 does not rotate easily without the rotation of an external force.The first lock slot 105 and the second lock slot 106 are based on the same principle. In actual situations, only one of the lock structures can be used to switch the rotating push head 1 between the locked state and the unlocked state. The two lock structures are used to achieve a symmetrical balance of a card point when the push head 1 rotates and the rotation of the push head 1 is stable. The advantages of the lock structure of the present invention are that it is simple in structure, can switch between the locked state and the unlocked state by rotating a certain angle, and can be stable in the locked state and the unlocked state. In the locked state, it can effectively prevent the push head 1 from being squeezed out by mistake.

[0037] The lower end of the handle 2 is sleeved on the piston seat 6. The inner side wall of the handle 2 has a step. The lower end of the step abuts against the upper end of the piston seat 6, so that when the handle 2 is pushed downward, the piston seat 6 is driven to move downward. The lower end of the handle 2 also abuts against the upper end of the piston 5. The piston 5 is sleeved on the outside of the piston seat 6. The lower end of the handle 2 also extends a step to buckle the upper end of the piston 5 on the piston seat 6. The piston 5 is sleeved on the outside of the piston seat 6. The side of the piston seat 6 close to the piston 5 has a hole that passes through the piston seat 6 horizontally. The piston seat 6 also has an upper opening channel, which is connected to the channel of the handle 2. The hole of the piston seat 6 that passes through the piston seat 6 horizontally is connected to the upper opening channel. When the pump head is in a non-pressed state, the side of the piston 5 close to the piston seat 6 will close the hole of the piston seat 6 that passes through the piston seat 6 horizontally. The piston 5 abuts against the inner wall of the cylinder 7 on the side away from the piston seat 6. The contact point where the piston 5 abuts against the inner wall of the cylinder 7 has a certain friction force, so that when the piston 5 is pushed downward by the handle 2, the upper end of the piston 5 will be subjected to the downward force from the handle 2, and the cylinder 7 has an upward friction force on the side of the piston 5 close to the cylinder 7, so that the piston 5 will be deformed, and the lower end of the side of the piston 5 close to the piston seat 6 will be opened outward, exposing the hole that passes through the piston seat 6 horizontally, so that the liquid can rise from the hole that passes through the piston seat 6 horizontally to the inside of the piston seat 6, so that the liquid continues to rise into the handle 2 and the head 1. In addition, the upper end of the piston 5 also abuts against the lower end of the outer cover 3, that is, the abutment of the piston 5 against the upper end of the outer cover 3 is the upper limit position of the upward movement of the piston 5, so that the piston 5 can limit the continued upward movement of the piston seat 6 and limit the upward movement of the piston seat 6. A step is provided on the inner surface of the lower end of the cylinder 7, and the piston 5 will abut and stop on the step when moving downward, which is the downward limit position of the piston 5.

[0038] The upper end of the cylinder 7 is fixedly connected to the outer cover 3. The cylinder 7 is a hollow structure. The cylinder 7 is sleeved on the outer side of the piston 5. The piston 5, the piston seat 6 and the spring 8 are arranged in the cylinder 7. The lower end surface of the piston 5, the lower end surface of the piston seat 6 and the inner side surface of the cylinder 7 together constitute a liquid suction chamber. The spring 8 is arranged in the liquid suction chamber. The upper end of the spring 8 abuts against the lower end of the piston seat 6, and the lower end of the spring 8 abuts against the inner surface of the lower end of the cylinder 7. When an external force presses the pressing head 1 downward, the pressing head 1 pushes the handle 2, the piston 5, and the piston seat 6 to move downward together, the piston seat 6 will compress the spring 8, and the spring 8 will shrink under the pressure. When the downward external force on the outer cover 3 is removed, the contracted spring 8 will return to its original state, pushing the piston seat 6, the piston 5, the handle 2 and the pressing head 1 to move upward. The lower end of the cylinder 7 is also provided with an opening, and a groove is provided at the lower end opening. The steel ball 9 is arranged in the groove. The steel ball 9 can play the role of a one-way valve. Specifically, the liquid in the liquid suction chamber can press the steel ball 9 in the groove, and the steel ball 9 closes the lower end opening of the cylinder 7. When the pressure above the steel ball 9 is small, the liquid below the steel ball 9 can also push the steel ball 9 to move up to open the lower end opening of the cylinder 7. The liquid below the steel ball 9 enters above the steel ball 9, that is, the liquid enters the liquid suction chamber to achieve the effect of liquid suction in the liquid suction chamber. The steel ball 9 can also be replaced by any one-way valve with the same technical effect.

[0039] In order to achieve the pump head to make the air pressure inside the external bottle and the air pressure outside the bottle relatively balanced, so that when the pump head is pressed, there is enough air pressure in the bottle to squeeze the liquid in the bottle into the liquid suction cavity, such as Figure 3 As shown, the outer cover 3 also includes at least one first air return hole 307, which penetrates the outer cover 3, so that the air outside the pump head can enter the gap between the outer cover 3 and the barrel 7 from the first air return hole 307. The barrel 7 also includes a second air return hole 71, which is arranged on the inner side wall of the barrel 7. When the pressing head 1 is in a non-pressing state, the piston 5 is in the upper limit position, and the side of the piston 5 close to the barrel 7 is just aligned with the position of the second air return hole 71, and the piston 5 closes the second air return hole 71. In this state, even if the external air can enter the gap between the outer cover 3 and the barrel 7 from the first air return hole 307, the air cannot enter the bottle of the external bottle through the second air return hole 71. At this time, closing the external air from entering the bottle can reduce the oxidation or contamination of the liquid in the bottle by the external air. When the pressing head 1 is in the pressing state, since the piston 5 moves downward, the piston 5 no longer closes the second air return hole 71, and the external air can pass through the first air return hole 307 into the gap between the outer cover 3 and the tube 7, and then enter the external bottle from the gap between the outer cover 3 and the hole, thereby compensating for the reduced volume of the liquid leaving the pump head in the pressing state and maintaining the air pressure balance inside and outside the bottle.

[0040] The upper end of the straw 10 is plugged into the lower end of the tube 7, and the lower end of the straw 10 is inserted below the liquid level in the external bottle. The straw 10 is a prior art and is used to extend the liquid suction distance of the pump head.

[0041] In actual use, it is necessary to rotate the button 1 first so that the first lock slot 105 moves from the first locking point 303 to the second locking point 304, and the second lock slot 106 moves to the third locking point 305, that is, the button 1 switches from the locked state to the unlocked state. Press the button 1 in the unlocked state so that the button 1 can move downward.

[0042] like Figure 1 As shown, the first time that the pressing head 1 is pressed with external force (that is, the first time that it is in a pressing state), the pressing head 1 moves downward, and the step on the inner side of the annular columnar structure of the pressing head 1 also pushes the handle 2 to move downward, and the handle 2 also pushes the piston 5 and the piston seat 6 to move downward to compress the space of the liquid suction chamber. At this time, the spring 8 is squeezed to store elastic force. During the downward movement of the piston 5, the side of the piston 5 close to the cylinder 7 has friction, so that the piston 5 is deformed, and the hole on the piston seat 6 that transversely penetrates the piston seat 6 is opened. When there is no liquid in the liquid suction chamber itself, that is, when there is only air in the liquid suction chamber, the steel ball 9 has the function of a one-way valve to close the lower end opening of the cylinder 7. The air in the liquid suction chamber will only enter the handle 2 from the hole on the piston seat 6 that transversely penetrates the piston seat 6, rise, and finally leave the pressing head 1. In addition, when the piston 5 moves downward, the second air return hole 71 on the cylinder 7 is also opened, and the external air enters the bottle of the external bottle through the first air return hole 307 on the outer cover 3 and the second air return hole 71 on the cylinder 7 in turn, balancing the air pressure inside and outside the bottle.

[0043] When the external force pressing the push head 1 is removed for the first time, the spring 8 releases its elastic force, and the spring 8 pushes the piston seat 6 upward. The piston seat 6 moves upward while pushing the piston 5 and the handle 2 upward. During the upward movement of the piston 5, the hole on the piston seat 6 that runs through the piston seat 6 horizontally is closed and the second air return hole 71 is closed. The piston 5 and the piston seat 6 move upward to increase the space of the liquid suction chamber, and the air pressure in the liquid suction chamber is reduced. The air pressure in the bottle of the external bottle is greater than the air pressure in the liquid suction chamber, resulting in an air pressure difference. The air pressure in the bottle moves the liquid in the bottle upward through the straw 10 and pushes the steel ball 9 away. The liquid in the bottle is pressed into and stored in the liquid suction chamber. Finally, the piston 5 stops upward against the lower end of the outer cover 3 (that is, the upper limit position of the piston 5), and at the same time, the piston seat 6 is restricted from continuing to move upward and the piston seat 6 is restricted from continuing to push the handle 2 and the push head 1 upward, and the pump head returns to a non-pressed state.

[0044] like Figure 4As shown, the second time the pressing head 1 is pressed with external force (i.e., the second time it is in the pressing state), the principle is the same as the first time the pressing head 1 is pressed with external force, and the movement of the pressing head 1, the handle 2, the piston 5, and the piston seat 6 will not be repeated here. The difference is that at this time, liquid has been stored in the liquid suction chamber, and the piston seat 6 and the piston 5 move downward to compress the space of the liquid suction chamber, and the liquid in the liquid suction chamber can enter the interior of the piston seat 6 from the hole on the piston seat 6 that passes through the piston seat 6 horizontally, and then the liquid passes through the piston seat 6 and the handle 2 in turn, and is finally squeezed out from the liquid outlet channel 104 of the pressing head 1. However, in this state, the liquid that fails to leave the liquid outlet channel 104 of the pressing head 1 is retained in the liquid outlet channel 104.

[0045] like Figure 5 As shown, the second time the external force pressing the pressing head 1 is removed, the principle is the same as the first time the external force pressing the pressing head 1 is removed, and the liquid in the external bottle is again added to the liquid suction cavity due to the air pressure difference. The difference from the first time of using external force to press the pressing head 1 is that the pressing head 1 moves upward to expand the space of the storage chamber 11, the pressure in the storage chamber 11 decreases, and the external air pressure presses the liquid retained in the liquid outlet channel 104 into the storage chamber 11 through the gap groove 101, and effectively prevents the liquid from being contaminated or oxidized in the liquid outlet channel 104.

[0046] like Figure 4 As shown, when the external force is used to press the pressing head 1 for the next time, the principle is the same as the second time of using external force to press the pressing head 1. The difference is that the annular columnar structure of the pressing head 1 is inserted into the storage chamber 11, the space in the storage chamber 11 is reduced, and the liquid stored in the storage chamber 11 is pressed out to the liquid outlet channel 104. At the same time, the liquid in the liquid suction chamber will also rise to the liquid outlet channel 104. The liquid coming out of the storage chamber 11 and the liquid coming out of the liquid suction chamber are squeezed out of the pressing head 1 outlet together. The liquid coming out of the storage chamber 11 and the liquid coming out of the liquid suction chamber do not affect each other's flow before reaching the liquid outlet channel 104, and the function of the pump body itself to squeeze the liquid in the bottle is completely unaffected.

[0047] For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and concepts described above, and all of these changes and modifications should fall within the protection scope of the claims of the present invention.

Claims

1. A pump head with a back-suction effect, characterized in that: The invention comprises a pressing head, an outer cover and a handle, wherein the handle is movably connected to the outer cover, the pressing head is connected to one end of the handle, and a storage chamber for storing liquid is formed between the inner surface of the outer cover and the outer surface of the handle. The pressing head comprises a columnar structure extending toward the storage chamber, the columnar structure is inserted at one end of the storage chamber close to the columnar structure, the pressing head comprises a liquid outlet channel, and the storage chamber is communicated with the liquid outlet channel. In the pressed state, the columnar structure is used to be inserted into the storage chamber to reduce the internal space of the storage chamber, so that the pressure inside the storage chamber is greater than the pressure of the liquid outlet channel, so as to squeeze the liquid in the storage chamber into the liquid outlet channel. In the non-pressed state, the columnar structure is used to move away from the storage chamber to expand the internal space of the storage chamber, so that the internal pressure of the storage chamber is less than the pressure of the liquid outlet channel, so as to suck the liquid in the liquid outlet channel back into the storage chamber. The pressing state refers to an external force acting on the pressing head, so that the pressing head moves closer to the outer cover, and the pressing head drives the columnar structure to move from the end of the storage chamber close to the pressing head to the end close to the outer cover, so as to reduce the internal space of the storage chamber. It also includes a cylinder, a spring, a piston seat and a piston. The end of the handle away from the push head is connected to the piston seat and the piston. One end of the cylinder is connected to the outer cover, and the other end has an opening for external liquid to enter. The handle, spring, piston seat and piston are all arranged in the cylinder. The piston sleeve is arranged on the outer side of the piston seat. The cylinder, piston seat and piston form a liquid suction cavity for sucking external liquid from the opening of the cylinder. The handle includes a first liquid channel for liquid to pass through, and the first liquid channel is connected to the liquid outlet channel of the pressing head at one end close to the pressing head. The piston seat includes a second liquid channel opened at one end close to the handle, and the liquid outlet channel of the pressing head, the first liquid channel, and the second liquid channel are connected in sequence. The piston seat further comprises at least one hole for connecting the second liquid channel and the liquid suction chamber on the side close to the piston. The side of the piston close to the piston seat closes the hole of the piston seat in a non-pressed state. The side of the piston away from the piston seat abuts against the inner surface of the cylinder. The piston is used to deform in a pressed state to open the hole on the piston seat, allowing external liquid in the liquid suction chamber to enter the piston seat. One end of the spring is connected to the piston seat, and the other end is connected to the inner surface of the cylinder. The spring is in a compressed state when pressed, and in a rebound state when not pressed. The spring is used to push the piston seat to make the handle and the button rebound to their original positions. In the pressed state, the pressing head is in a state of approaching the piston seat, forcing the handle to push the piston and the piston seat, so that the space of the liquid suction chamber is reduced, and the liquid in the liquid suction chamber is squeezed to the liquid outlet channel of the pressing head. In a non-pressed state, the spring is used to release elastic force to push the piston and the piston seat to increase the space of the liquid suction chamber, so that the liquid suction chamber sucks external liquid from the opening of the cylinder.

2. The pump head with back-suction effect as claimed in claim 1, characterized in that: The push head also includes a lock slot, and the outer cover is provided with a lock track for the lock slot to move. The lock slot is connected to one end of the push head close to the lock track, and the lock track includes a first point and a second end point. At the position of the first end point, the lock track extends a distance away from the push head, and the lock slot moves within the distance, so that when the lock slot is located at the first end point, the push head is in an unlocked state. The unlocked state is when an external force acts on the push head and the push head approaches the outer cover; the locked state is when the lock head slot is located outside the first end point, restricting the push head from moving toward the outer cover.

3. The pump head with back-suction effect as claimed in claim 2, characterized in that: A first clamping point is provided at the first end point of the lock track, and a second clamping point is provided at the second end point. The first clamping point and the second clamping point are respectively used to stably clamp the lock slot at the first clamping point and the second clamping point.

4. The pump head with back-suction effect according to claim 1, characterized in that: A one-way valve is also included, which is connected to the opening of the tube. The one-way valve is used to prevent the liquid in the suction chamber from leaving the suction chamber through the opening of the tube in a pressed state, and to allow external liquid to be sucked into the suction chamber in a non-pressed state.

5. The pump head with back-suction effect as claimed in claim 4, characterized in that: The one-way valve is a steel ball, which is arranged inside the cylinder near one end of the opening of the cylinder.

6. The pump head with back-suction effect according to claim 1, characterized in that: The outer cover is provided with a first air return hole, the barrel is provided with a second air return hole, the barrel and the outer cover are provided with a gap, the first air return hole, the gap between the barrel and the outer cover, and the second air return hole are sequentially connected, so that the air outside the pump body sequentially passes through the first air return hole, the gap between the barrel and the outer cover, and the second air return hole to be discharged into the external bottle; when the piston is at the upper limit position, the second air return hole is closed, The upward limit position means that the piston abuts against the outer cover, and the outer cover restricts the piston from continuing to move toward the outer cover.

7. The pump head with back-suction effect according to claim 1, characterized in that: The invention also comprises a straw, one end of which is connected to the opening of the tube, and the other end of which is inserted below the liquid surface of the external liquid.

8. The pump head with back-suction effect as claimed in claim 1, characterized in that: The connection mode of the button head and the handle is a double-layer buckle connection.

9. The pump head with back-suction effect according to claim 1, characterized in that: The outer cover is connected to the bottle mouth of the external bottle, and a gasket is arranged between the outer cover and the bottle mouth, and the gasket is used to seal the gap between the outer cover and the bottle mouth.

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