Emulsion pump

Abstract

The invention provides an emulsion pump, and belongs to the technical field of container accessories. The anti-counterfeiting emulsion pump solves the problems that an existing emulsion pump lacks an anti-counterfeiting function, is insufficient in use sanitation and is difficult to apply in the fields of medicine and food. The emulsion pump comprises a rotary cover, a liquid suction pipe and a gland with a vertically-arranged liquid outlet pipe, the rotary cover is tubular, a piston pipe is concentrically arranged in the rotary cover, the piston pipe and the rotary cover are in point connection to form an integrated structure, and the gland is slidably inserted into the upper end of the rotary cover in the vertical direction. The upper end of the piston pipe is communicated with the liquid outlet pipe of the gland in an inserted mode to form axial fixation, the upper end of the liquid suction pipe is connected between the lower end of the piston pipe and the lower end of the screw cap in an inserted mode, and the liquid suction pipe is in sliding fit with the piston pipe and forms axial fixation with the screw cap. The anti-fake emulsion pump has an anti-fake function, can effectively identify whether the emulsion pump is used for the first time or not, has high use safety, and can well meet the strict requirements of food and medicine fields for sanitation and safety.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of container accessories, and relates to an emulsion pump. BACKGROUND

[0002] The emulsion pump is a pump device that delivers liquid in a container to outside the container by pressing in accordance with a predetermined metering, realizes sanitary and controllable use of liquid, and is widely applied to liquid packaging such as daily chemicals, cosmetics and the like. With the application demand in product fields, the application demand of the emulsion pump in the medical and food fields also gradually appears.

[0003] At present, the common emulsion pump on the market mainly adopts a piston type suction structure. For example, a spring external type emulsion pump disclosed in a patent document (application number: 200610027850.6) comprises a push head, a mouthpiece, a connecting conduit, a piston, a cylinder, a reset spring, a suction pipe and the like. The upper end of the cylinder is connected with the mouthpiece through a thread, the piston is vertically slidably arranged in the cylinder, the upper end of the piston is fixedly connected with the connecting conduit, and the piston moves linearly in the cylinder along with the movement of the push head and the connecting conduit. The reset spring is sleeved outside the piston, the upper end of the reset spring abuts against the connecting conduit, and the lower end of the reset spring abuts against the inner wall of the cylinder, so that the reset spring can drive the piston and the push head to move upward for resetting. The spring external type emulsion pump has the following deficiencies:

[0004] 1. In the medical and food fields, the sanitary requirement is extremely strict. The piston of the emulsion pump needs to be made of rubber, and the rubber material is prone to breed bacteria in the long-term use process. In addition, part of the medical liquid has strong chemical activity, which may react with the rubber, resulting in contamination of the medical liquid. Therefore, the emulsion pump is difficult to meet the stringent sanitary requirements in the medical and food fields.

[0005] 2. More importantly, the safety requirement of the emulsion pump in the medical field is extremely strict, which requires the emulsion pump to be disposable to prevent unscrupulous manufacturers from recycling and reusing the used emulsion pump. However, the spring external type emulsion pump does not have a relevant "anti-fake" function, and cannot effectively identify and prevent the reuse. If the emulsion pump is maliciously or accidentally reused, the bacteria, viruses or other contaminants remaining on the emulsion pump may contaminate the new medical liquid, leading to cross infection and causing serious threat to the health of patients, which makes the application of the emulsion pump in the medical field exist a major risk.

[0006] Therefore, the spring external type emulsion pump cannot meet the stringent sanitary and safety requirements in the food and medical fields, and is difficult to be effectively applied. SUMMARY

[0007] The emulsion pump of the present application solves the problems of the lack of anti-fake function and poor use hygiene of the existing emulsion pump, and can be applied in the medical and food fields.

[0008] The emulsion pump of the present application solves the problems of the lack of anti-fake function and poor use hygiene of the existing emulsion pump, and can be applied in the medical and food fields.

[0009] In use, the rotating cap is connected to the bottle body, and after connection, the rotating cap is fixed relative to the bottle body. The pressing cap is vertically inserted into the upper end of the rotating cap, so that when the pressing cap is pressed downward, the pressing cap can move downward relative to the rotating cap.

[0010] When the emulsion pump is shipped, the rotating cap and the piston tube are injection molded at one time, and the two are connected by a point. When used for the first time, because the upper end of the piston tube is inserted into the liquid outlet pipe of the pressing cap and is axially fixed, when the pressing cap is pressed downward, the rotating cap is fixed to the bottle body, and the pressing cap pushes the piston tube downward. At this time, because the rotating cap and the piston tube are connected by a point, the connection structure is weak, so the connection between the rotating cap and the piston tube will eventually break under the action of the pressing force. At this time, the operator will get obvious force feedback and know that the emulsion pump is used for the first time, so that the emulsion pump has an anti-fake function.

[0011] After the connection between the rotating cap and the piston tube is broken, continue to press the pressing cap, and the pressing cap will move downward with the piston tube, thereby compressing the space inside the bottle body, increasing the pressure inside the bottle, and finally the pressure inside the bottle is greater than the pressure outside the bottle. Under the action of the pressure difference, the liquid in the bottle enters the piston tube and then is discharged from the liquid outlet pipe of the pressing cap. As can be seen, the emulsion pump is different from the conventional piston type emulsion pump structure, which does not use the negative pressure formed in the piston cylinder when the piston moves upward to pump the liquid into the piston cylinder and then discharge it, but uses the positive pressure formed in the bottle body by moving the pressing cap and the piston tube downward to pump the liquid, which eliminates the structure of the traditional rubber piston and avoids the pollution of the liquid caused by the rubber, and has high use hygiene.

[0012] In addition, considering that the piston tube of the emulsion pump needs to move up and down to realize the pumping of the liquid and force the connection part to break, in order to avoid the movement of the piston tube affecting the normal suction of the suction tube, the upper end of the suction tube is inserted between the lower end of the piston tube and the lower end of the screw cap, and the suction tube and the piston tube are in sliding fit and axial fixation with the screw cap. In this way, during the up and down movement of the piston tube, the suction tube will be fixed by the screw cap and will not move up and down with the piston tube, so as to realize the communication between the suction tube and the piston tube, while ensuring that the lower end of the suction tube is always accurately positioned at the preset position in the bottle, so as to avoid the situation that the lower end of the suction tube is too high, causing some medicine to remain in the bottom of the bottle and not to be pumped out completely, affecting the dose of the medicine. At the same time, it can also avoid the situation that the lower end of the suction tube is too low and close to the bottom surface of the bottle body or even bent, so as to ensure the accuracy of the dose of the medicine.

[0013] In summary, the emulsion pump can greatly improve the use hygiene of the emulsion pump, has the function of "anti-fake", can effectively identify whether the emulsion pump is used for the first time, and has high use safety. The improvement makes the emulsion pump meet the strict requirements of food and medicine fields on hygiene and safety, so as to realize effective application in these fields.

[0014] In the emulsion pump described above, the inner circumferential surface of the screw cap is protruded to form a plurality of triangular connection parts, each connection part is uniformly and spacedly arranged along the circumferential direction of the screw cap, the bottom edge of the connection part is integrally formed on the inner circumferential surface of the screw cap, and the top corner is integrally formed on the outer circumferential surface of the piston tube. This design makes the screw cap and the piston tube form a point connection, and the top corner part connected with the outer circumferential surface of the piston tube in the triangular connection part is a weak structure position, so that when the screw cap is pressed downward for the first time, the connection part will break at the position connected with the outer circumferential surface of the piston tube. At the same time, since each connection part is uniformly and spacedly arranged along the circumferential direction of the piston tube, each connection part can form a sliding fit with the outer circumferential surface of the piston tube after breaking, and guide the piston tube. Therefore, the design of the connection part in the emulsion pump plays a dual role of "anti-fake" and guidance, which can improve the use safety and has good use stability, so that the emulsion pump can pump accurately, so as to provide more reliable and accurate medicine delivery for patients in the medical field, ensure the treatment effect and the safety of medicine use.

[0015] In the emulsion pump, the number of the connecting parts is at least three, and each connecting part is located in the middle of the piston tube axis direction, and the lower side of each connecting part abuts against the upper end surface of the suction tube. Each connecting part is located in the middle of the piston tube axis direction, so that the piston tube can be guided during the up-down movement of the piston tube, and the gland and the piston tube can be stably moved up and down. In addition, when the suction tube is installed, the upper end of the suction tube abuts against the lower side of each connecting part after being inserted between the lower end of the piston tube and the lower end of the screw cap. At this time, the connecting part also plays a role in limiting the insertion depth of the suction tube, so the connecting part plays a role of one thing with three uses. Such a design can improve the installation accuracy of the suction tube, so that after the emulsion pump is installed on the bottle, the lower end of the suction tube can be accurately positioned at the preset position in the bottle. In this way, it can not only prevent the lower end of the suction tube from being too high to cause drug residue, but also avoid being too low to be close to the bottle bottom or being bent, so as to ensure the accuracy of the drug dose.

[0016] In the emulsion pump, the gland further comprises a cylindrical outer cylinder integrally formed with the liquid outlet tube, the outer cylinder is located outside the liquid outlet tube and is arranged concentrically with the liquid outlet tube, the opening edge part of the upper end of the screw cap is gradually reduced in diameter from bottom to top to form a conical shape, and the outer cylinder is vertically slidably inserted into the screw cap, and the outer periphery of the outer cylinder abuts against the opening edge of the upper end of the screw cap. During use of the emulsion pump, the gland and the piston tube are connected together and move up and down together. During the movement, the opening edge of the upper end of the screw cap abuts against the outer periphery of the outer cylinder to provide a guide for the outer cylinder, and the connecting part also guides the piston tube. This design forms a double-direction guide structure, so that the gland and the piston tube can be stably moved. Even if the piston is omitted, the stable pumping of the liquid can still be ensured, so as to improve the use hygiene, ensure the stability of the emulsion pump, and ensure the accuracy of the pumping dose, so as to ensure the treatment effect and the safety of drug use in the medical field.

[0017] In the emulsion pump, the upper section and the lower section of the rotating cap are both in the shape of a circular tube, the diameter of the upper section is larger than that of the lower section, and the diameter gradually decreases from the upper section to the lower section through the intermediate section. The lower end of the outer cylinder is provided with a plurality of strip-shaped grooves I arranged in the circumferential direction, each of which is vertically arranged and penetrates the lower end surface of the outer cylinder, and the lower end of the outer cylinder slides along the inner circumferential surface of the intermediate section of the rotating cap when the pressing cap is pressed downward. Each of the strip-shaped grooves I is vertically arranged and penetrates the lower end surface of the outer cylinder, so that the lower end of the outer cylinder forms a plurality of elastic piece structures, and because the diameter of the intermediate section of the rotating cap gradually decreases from the upper section to the lower section, the elastic pieces can deform inwardly when the pressing cap moves downward, and the elastic pieces can return to the initial position when the pressure is released, thereby pushing the pressing cap to reset upward. In this structure, the pressing cap made of conventional food safety plastic (PP or PE) replaces the metal spring to achieve the upward reset of the pressing cap, avoiding the problem of oxidation or rust caused by long-term contact of the metal spring with the liquid, so that the emulsion pump has high use hygiene and can be effectively applied in the fields of medicine and food.

[0018] In the emulsion pump, the inner circumferential surface of the rotating cap is provided with an annular stepped surface arranged in the circumferential direction, which is located at the connection between the lower section and the intermediate section of the rotating cap, and the upper end surface of each connection part is coplanar with the annular stepped surface. When the pressing cap is pressed downward, the lower end of the outer cylinder of the pressing cap abuts against the annular stepped surface, thereby limiting the stroke of the downward movement of the pressing cap. The upper end surface of each connection part is coplanar with the annular stepped surface, so that the connection part can avoid the lower end of the outer cylinder being stuck in the gap between the rotating cap and the piston tube, thereby ensuring that the pressing cap can smoothly reset upward.

[0019] In the emulsion pump, in the circumferential direction of the outer cylinder, a middle part between each adjacent two strip-shaped grooves I on the outer cylinder is provided with a strip-shaped groove II, which is vertically arranged and penetrates the lower end surface of the outer cylinder, and the length and width of the strip-shaped groove II are smaller than those of the strip-shaped groove I. In the initial stage of pressing the pressing cap, the strip-shaped groove I plays a role, so that the lower end of the outer cylinder can be deformed smoothly. As the pressing cap approaches the annular stepped surface, the strip-shaped groove II further intervenes, and the smaller strip-shaped groove II further enhances the deformation ability of the elastic piece, thereby providing a stronger reset force in the later stage, so that the pressing cap can reset upward smoothly when the pressing cap is released. At the same time, because the size of the strip-shaped groove II is small, each elastic piece can still maintain sufficient structural strength while providing the reset force, thereby ensuring that the outer cylinder will not be damaged due to excessive deformation in long-term use. Through such improvement, the emulsion pump has good use stability while saving the spring and improving the use hygiene.

[0020] In the emulsion pump, the outer peripheral surface of the lower end of the outer cylinder body is integrally formed with a limiting hook portion protruding to the side portion in the circumferential direction, the inner peripheral surface of the connection between the upper section and the middle section of the rotating cap is integrally formed with a limiting protruding rib in the circumferential direction, and the limiting hook portion is located at the lower side of the limiting protruding rib and abuts against the limiting protruding rib. By abutting the limiting hook portion of the lower end of the outer cylinder body against the limiting protruding rib on the inner peripheral surface of the rotating cap, the stroke of the upward movement of the pressing cap is effectively limited. This design does not need to additionally provide a metal member such as a snap ring to limit the stroke of the upward movement of the pressing cap, is convenient to manufacture, avoids the sanitary problem caused by the provision of the metal member, and makes the emulsion pump better in use hygiene.

[0021] In the emulsion pump, the inner peripheral surface of the lower end of the rotating cap is integrally formed with an annular protruding rib with an arc-shaped cross section, and the annular protruding rib abuts against the outer peripheral surface of the liquid suction pipe. After the liquid suction pipe is inserted into the rotating cap, the annular protruding rib can tightly bite the liquid suction pipe, improves the installation stability of the liquid suction pipe, avoids the position of the liquid suction pipe from being loose during use, ensures the installation accuracy of the liquid suction pipe, and makes the lower end of the liquid suction pipe accurately be at a preset position in the bottle after the emulsion pump is installed on the bottle body, thereby ensuring the dose accuracy of the medicine.

[0022] In the emulsion pump, the upper end of the outer cylinder body extends to the side portion and is provided with a strip-shaped and hollow liquid outlet nozzle, the liquid outlet nozzle is integrally formed with the outer cylinder body and is in communication with the liquid outlet pipe. The integrally formed liquid outlet nozzle is more firmly connected with the outer cylinder body, improves the sealing property, prevents liquid leakage, and ensures the safety during use.

[0023] Compared with the prior art, the emulsion pump has the following advantages:

[0024] 1. The emulsion pump can greatly improve the use hygiene of the emulsion pump, has the "anti-fake" function, can effectively identify whether the emulsion pump is used for the first time, and has high use safety. This improvement makes the emulsion pump be able to meet the stringent requirements of the food and medical fields on hygiene and safety, thereby enabling effective application in these fields.

[0025] 2. The emulsion pump uses a pressing cap made of conventional food safety plastic (PP or PE) to replace a metal spring to realize the upward reset of the pressing cap, and the entire emulsion pump is a full plastic product, that is, all plastic materials are used to make the emulsion pump, thereby avoiding the problems of oxidation or rust caused by long-term contact of the metal spring with liquid, and making the emulsion pump have high use hygiene. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the three-dimensional structure of the emulsion pump.

[0027] Figure 2 is a partial sectional view of the emulsion pump before the emulsion pump is used for the first time.

[0028] Figure 3 is a perspective view of the screw cap and piston tube.

[0029] Figure 4 is a top view of the screw cap and piston tube.

[0030] Figure 5 is Figure 4 a sectional view of A-A in FIG.

[0031] Figure 6 is Figure 4 a sectional view of B-B in FIG.

[0032] Figure 7 is a front view of the screw cap and piston tube.

[0033] Figure 8 is Figure 7 a sectional view of A-A in FIG.

[0034] Figure 9 is a perspective view of the screw cap and piston tube.

[0035] Figure 10 is a bottom view of the screw cap and piston tube.

[0036] Figure 11 is a use state diagram of the present emulsion pump after pressing the cap downward.

[0037] In the figure, 11 is a screw cap, 111 is an annular stepped surface, 112 is a limiting convex rib, 113 is an annular convex rib, 12 is a piston tube, 121 is a one-way valve, 121a is a fan-shaped blade, 13 is a connecting part, 14 is a screw cap part, 2 is a liquid suction tube, 3 is a cap, 31 is a liquid outlet tube, 32 is an outer cylinder, 321 is a strip-shaped groove 1, 322 is a strip-shaped groove 2, 323 is a limiting hook part, and 33 is a liquid outlet nozzle. DETAILED DESCRIPTION

[0038] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in combination with the accompanying drawings, but the present application is not limited to these embodiments.

[0039] Example 1

[0040] As Figure 1 , Figure 2 and Figure 3As shown, the emulsion pump comprises a screw cap 11, a suction tube 2 and a gland 3 with a vertically arranged liquid outlet tube 31. The screw cap 11 is tubular, and a piston tube 12 is concentrically arranged in the screw cap 11. The two are connected by a point to form an integrated structure. A cylindrical screw cap portion 14 is integrally formed on the outer circumferential surface of the screw cap 11, and a thread is arranged on the inner circumferential surface of the screw cap portion 14. The gland 3 is vertically and slidingly inserted into the upper end of the screw cap 11, and the upper end of the piston tube 12 is axially fixedly connected to the liquid outlet tube 31 of the gland 3. The upper end of the suction tube 2 is inserted between the lower end of the piston tube 12 and the lower end of the screw cap 11. The suction tube 2 is slidingly connected to the piston tube 12 and axially fixed to the screw cap 11.

[0041] Specifically, as shown in Figure 2 and Figure 5 , three triangular connecting portions 13 are protruded on the inner circumferential surface of the screw cap 11. The three connecting portions 13 are located in the middle of the axial direction of the piston tube 12. The lower side of each connecting portion 13 abuts against the upper end surface of the suction tube 2, so that the connecting portion 13 functions to limit the insertion depth of the suction tube 2 and improve the installation accuracy of the suction tube 2. An annular protruding rib 113 with an arc-shaped cross section is integrally formed on the inner circumferential surface of the lower end of the screw cap 11, and the annular protruding rib 113 abuts against the outer circumferential surface of the suction tube 2.

[0042] As shown in Figure 4 , Figure 7 and Figure 8 , the connecting portion 13 is triangular, with the base integrally formed on the inner circumferential surface of the screw cap 11 and the apex integrally formed on the outer circumferential surface of the piston tube 12. The connecting portions 13 are uniformly and circumferentially spaced apart. The apex portion of the triangular connecting portion 13 connected to the outer circumferential surface of the piston tube 12 is a weak structure position. Therefore, when the gland 3 is pressed downward for the first time, the connecting portion 13 connected to the outer circumferential surface of the piston tube 12 will be broken.

[0043] As shown in Figure 4 and Figure 6 , a one-way valve 121 for allowing liquid to flow upward only is integrally formed in the piston tube 12. The one-way valve 121 is sheet-shaped, with the upper side being spherical. The one-way valve 121 has three circumferentially spaced apart fan-shaped blades 121a. The wall thickness of each fan-shaped blade 121a near the axial line of the piston tube 12 is relatively thin, which allows the fan-shaped blade 121a to be deformed upward. When the fan-shaped blade 121a has a downward deformation tendency, the outer edge thereof tightly abuts against the inner circumferential surface of the piston tube 12, thereby preventing the fan-shaped blade 121a from swinging downward. Therefore, liquid can only flow upward through the one-way valve 121, but cannot flow downward. Alternatively, the one-way valve 121 in the piston tube 12 can also be a duckbill one-way valve 121.

[0044] As shown in Figure 2 ,Figure 9 and Figure 10 As shown, the cap 3 also includes a cylindrical outer cylinder 32 integrally formed with the liquid outlet pipe 31. The outer cylinder 32 is located outside the liquid outlet pipe 31 and is concentrically arranged with the liquid outlet pipe 31. A strip-shaped, hollow liquid outlet nozzle 33 extends laterally from the upper end of the outer cylinder 32. The liquid outlet nozzle 33 is integrally formed with the outer cylinder 32 and is connected to the liquid outlet pipe 31. The diameter of the opening edge at the upper end of the screw cap 11 gradually decreases from bottom to top, forming a constricted shape. The outer cylinder 32 is vertically slidably inserted into the screw cap 11, and the outer circumferential surface of the outer cylinder 32 is in contact with the opening edge at the upper end of the screw cap 11. The upper and lower sections of the cap 11 are both cylindrical, with the upper section having a larger diameter than the lower section, and the two are connected by a middle section whose diameter gradually decreases from top to bottom. The lower end of the outer cylinder 32 has several circumferentially spaced strip grooves 321, each vertically positioned and penetrating the lower end face of the outer cylinder 32, thus forming multiple elastic sheet structures at the lower end of the outer cylinder 32. For example... Figure 11 As shown, when the cap 3 is pressed down, the lower end of the outer cylinder 32 slides against the inner circumferential surface of the middle section of the cap 11, and these elastic plates can deform inward. When the pressure is released, these elastic plates will return to their initial position, thereby pushing the cap 3 upward to reset. Figure 2 The state shown.

[0045] like Figure 9 and Figure 10 As shown, there are three strip grooves 321. Of course, in actual manufacturing, the number of strip grooves 321 can be appropriately increased. In the circumferential direction of the outer cylinder 32, a second strip groove 322 is provided in the middle between each pair of adjacent strip grooves 321 on the outer cylinder 32. The second strip groove 322 is arranged vertically and penetrates the lower end face of the outer cylinder 32. The length and width of the second strip groove 322 are smaller than the length and width of the first strip groove 321.

[0046] like Figure 5 and Figure 6 As shown, the inner circumferential surface of the screw cap 11 has an annular stepped surface 111 arranged circumferentially. This annular stepped surface 111 is located at the connection between the lower section and the middle section of the screw cap 11, and the upper end surface of each connecting part 13 is coplanar with the annular stepped surface 111. Figure 2 As shown, a limiting hook 323 is integrally formed on the outer peripheral surface of the lower end of the outer cylinder 32, which is arranged in the circumferential direction and protrudes to the side. A limiting rib 112 is integrally formed on the inner peripheral surface of the connection between the upper section and the middle section of the screw cap 11, which is arranged in the circumferential direction. The limiting hook 323 is located on the lower side of the limiting rib 112 and abuts against the limiting rib 112.

[0047] The following is a brief introduction to the operating principle of this emulsion pump:

[0048] The emulsion pump is connected to the bottle body through the cap screw 11 on the outer circumferential surface of the cap 14, and the cap 11 is fixed relative to the bottle body after being connected.

[0049] As shown in Figure 2 , the cap 11, the piston tube 12 and the connecting part 13 are integrally injection molded when the emulsion pump is delivered from the factory. When used for the first time, the liquid outlet pipe 31 of the gland 3 is inserted and communicated with the upper end of the piston tube 12 to form axial fixation, so that when the gland 3 is pressed and moved downward, the cap 11 is fixed to the bottle body, and the gland 3 pushes the piston tube 12 downward to make the connecting part 13 bear the pressing force, and finally each connecting part 13 is broken at the same time under the action of the pressing force. At this time, the operator will get obvious force feedback and know that the emulsion pump is used for the first time, so that the emulsion pump has the "anti-fake" function.

[0050] As shown in Figure 11 , after the connecting part 13 is broken at the connecting part of the piston tube 12, the gland 3 is continuously pressed and moved downward with the piston tube 12, so as to compress the internal space of the bottle body, so that the pressure in the bottle is increased, and finally the pressure in the bottle is greater than the pressure outside the bottle. Under the action of the pressure difference, the liquid in the bottle enters the piston tube 12, and passes through the one-way valve 121 in the piston tube 12 to enter the space above the one-way valve 121, and at the same time, the liquid originally in the space above the one-way valve 121 is discharged from the liquid outlet nozzle 33.

[0051] When the gland 3 is loosened, the elastic sheet on the outer cylinder 32 will return to the initial position, thereby pushing the gland 3 to reset upward to the state as shown in Figure 2 . During the resetting process, the liquid entering the space above the one-way valve 121 will not flow back to the bottle body due to the existence of the one-way valve 121 in the piston tube 12, so as to ensure that the part of the liquid is discharged from the liquid outlet nozzle 33 when the gland 3 is pressed next time.

[0052] Example Two

[0053] The structure and principle of this embodiment are basically the same as those of example one, and the difference lies in that the number of connecting parts 13 is six, and each connecting part 13 is uniformly and circumferentially spaced apart along the piston tube 12.

[0054] Example Three

[0055] The structure and principle of this embodiment are basically the same as those of example one, and the difference lies in that the number of connecting parts 13 is four, and each connecting part 13 is uniformly and circumferentially spaced apart along the piston tube 12.

[0056] The specific embodiments described herein are merely illustrative of the principles of this application. Numerous modifications or adaptations will be readily apparent to those skilled in the art of this application without departing from the spirit or scope of the application as defined by the following claims.

[0057] Although the terms 11, rotating cap; 111, annular step surface; 112, limiting protrusion; 113, annular protrusion; 12, piston tube; 121, one-way valve; 121a, fan-shaped blade; 13, connecting portion; 14, screw cap portion; 2, suction tube; 3, gland; 31, liquid outlet tube; 32, outer cylinder; 321, strip-shaped groove I; 322, strip-shaped groove II; 323, limiting hook portion; 33, liquid outlet nozzle, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the nature of the present application; any interpretation of them as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A lotion pump comprising a screw cap (11), a suction tube (2) and a pressure cap (3) with a vertically arranged outlet tube (31), the screw cap (11) being tubular, characterized in that, The piston pipe (12) is arranged concentrically in the screw cap (11) and the two are formed into an integrated structure through point connection, the gland (3) is vertically slidingly inserted into the upper end of the screw cap (11), the upper end of the piston pipe (12) is inserted into and communicated with the liquid outlet pipe (31) of the gland (3) and is axially fixed, the upper end of the liquid suction pipe (2) is inserted between the lower end of the piston pipe (12) and the lower end of the screw cap (11), the liquid suction pipe (2) is slidingly matched with the piston pipe (12) and is axially fixed with the screw cap (11).

2. The lotion pump of claim 1, wherein The inner circumferential surface of the screw cap (11) is protruded to form a plurality of triangular connecting portions (13), each connecting portion (13) is uniformly and spacedly arranged along the circumferential direction of the screw cap (11), the bottom edge of the connecting portion (13) is integrally formed on the inner circumferential surface of the screw cap (11), and the top corner is integrally formed on the outer circumferential surface of the piston pipe (12).

3. The lotion pump of claim 2, wherein, The number of the connecting portions (13) is at least three, and the connecting portions (13) are located at the middle part of the axial direction of the piston pipe (12), and the lower side of each connecting portion (13) abuts against the upper end surface of the liquid suction pipe (2).

4. The lotion pump of claim 1 or 2 or 3, wherein, The gland (3) further comprises a cylindrical outer cylinder body (32) integrally formed with the liquid outlet pipe (31), the outer cylinder body (32) is arranged concentrically outside the liquid outlet pipe (31), the opening edge part of the upper end of the screw cap (11) is gradually reduced in diameter from bottom to top to form a necked shape, the outer cylinder body (32) is vertically slidingly inserted into the screw cap (11), and the outer circumferential surface of the outer cylinder body (32) abuts against the opening edge of the upper end of the screw cap (11).

5. The lotion pump of claim 4, wherein, The upper segment and the lower segment of the screw cap (11) are both circular tubes, the diameter of the upper segment is larger than that of the lower segment, and the two are connected through an intermediate segment with a diameter gradually reduced from top to bottom, the lower end of the outer cylinder body (32) is provided with a plurality of strip-shaped grooves I (321) arranged spacedly along the circumferential direction, each strip-shaped groove I (321) is vertically arranged and penetrates the lower end surface of the outer cylinder body (32), and when the gland (3) is pressed downward, the lower end of the outer cylinder body (32) slides along the inner circumferential surface of the intermediate segment of the screw cap (11).

6. The lotion pump of claim 5, wherein, The inner circumferential surface of the screw cap (11) has an annular stepped surface (111) arranged along the circumferential direction, the annular stepped surface (111) is located at the connection between the lower segment and the intermediate segment of the screw cap (11), and the upper end surface of each connecting portion (13) is coplanar with the annular stepped surface (111).

7. The lotion pump of claim 5, wherein, In the circumferential direction of the outer cylinder body (32), the middle part between every two adjacent strip-shaped grooves I (321) on the outer cylinder body (32) is provided with a strip-shaped groove II (322), the strip-shaped groove II (322) is vertically arranged and penetrates the lower end surface of the outer cylinder body (32), and the length and width of the strip-shaped groove II (322) are both smaller than those of the strip-shaped groove I (321).

8. The lotion pump of claim 5, wherein, The outer circumferential surface of the lower end of the outer cylinder body (32) is integrally formed with a limiting hook portion (323) arranged along the circumferential direction and protruding to the side portion, the inner circumferential surface of the connection between the upper segment and the intermediate segment of the screw cap (11) is integrally formed with a limiting protruding rib (112) arranged along the circumferential direction, the limiting hook portion (323) is located below the limiting protruding rib (112) and abuts against the limiting protruding rib (112).

9. The lotion pump of claim 1 or 2 or 3, wherein, The outer peripheral surface of the screw cap (11) is integrally formed with a cylindrical screw cap part (14), and the inner peripheral surface of the lower end of the screw cap (11) is integrally formed with an annular convex rib (113) with an arc-shaped cross section, which abuts against the outer peripheral surface of the suction tube (2).

10. The lotion pump of claim 4, wherein, The upper end of the outer cylinder body (32) extends to the side and is provided with a strip-shaped and internally hollow liquid outlet nozzle (33) which is integrally formed with the outer cylinder body (32) and communicates with the liquid outlet tube (31).

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