An emulsion pump

Abstract

The present application provides a kind of emulsion pump, belongs to container accessory technical field.It solves the problem that the existing emulsion pump lacks "anti-fake" function and is not enough in use hygiene, it is difficult to apply in the field of medicine, food.The emulsion pump includes screw cap, liquid suction pipe and gland with a vertical liquid outlet pipe, the screw cap is tubular, and the piston tube is concentrically arranged in the screw cap and is integrated by point connection, the gland is vertically slidingly inserted into the upper end of the screw cap, and the upper end of the piston tube is inserted into the liquid outlet pipe of the gland and is axially fixed, the upper end of the liquid suction pipe is inserted between the lower end of the piston tube and the lower end of the screw cap, the liquid suction pipe and the piston tube are slidingly matched and axially fixed with the screw cap.The present application has "anti-fake" function, can effectively identify whether the emulsion pump is used for the first time, has high use safety, so that the emulsion pump can well meet the stringent requirements of food, medicine field on hygiene 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] Furthermore, considering that this emulsion pump requires the piston tube to move up and down to pump the liquid and to prevent the connection from breaking, a structure is adopted to prevent the movement of the piston tube from 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, with the suction tube slidingly engaged with the piston tube and axially fixed with the screw cap. In this way, during the up-and-down movement of the piston tube, the suction tube is fixed by the screw cap and does not move up and down with the piston tube. This ensures both communication between the suction tube and the piston tube and guarantees that the lower end of the suction tube is always accurately positioned within the preset bottle. This avoids the situation where the lower end of the suction tube is too high, causing some drug residue at the bottom of the bottle that cannot be completely pumped out, thus affecting the drug dosage. At the same time, it also prevents the lower end of the suction tube from being too low, touching the bottom of the bottle, or even bending, thereby ensuring the accuracy of the drug dosage.

[0013] In summary, this emulsion pump significantly improves the hygiene of emulsion pump use and also features an anti-counterfeiting function, effectively identifying whether the emulsion pump is being used for the first time, thus ensuring high safety. This improvement allows the emulsion pump to meet the stringent hygiene and safety requirements of the food and pharmaceutical industries, enabling its effective application in these fields.

[0014] In the aforementioned emulsion pump, several triangular connecting parts protrude from the inner circumferential surface of the cap. These connecting parts are evenly spaced along the circumference of the cap, with their base integrally formed on the inner circumferential surface of the cap and their apex integrally formed on the outer circumferential surface of the piston tube. This design creates a point connection between the cap and the piston tube. The apex of the triangular connecting part, which connects to the outer circumferential surface of the piston tube, is a structurally weak point. Therefore, during initial use, when the cap is pressed down, the connection between the connecting part and the outer circumferential surface of the piston tube may break. Simultaneously, because the connecting parts are evenly spaced along the circumferential surface of the piston tube, after breakage, each connecting part can slide against the outer circumferential surface of the piston tube, guiding the piston tube. Therefore, the design of the connecting parts in this emulsion pump serves a dual purpose of "anti-counterfeiting" and guidance, improving safety while maintaining good stability. This ensures precise dosage delivery, providing patients with more reliable and accurate drug delivery in the pharmaceutical field, ensuring therapeutic efficacy and medication safety.

[0015] In the aforementioned emulsion pump, there are at least three connecting parts, all located at the center of the piston tube axis. The lower surface of each connecting part abuts against the upper end face of the suction tube. The central location of each connecting part ensures that the piston tube is guided during its vertical movement, allowing for stable up-and-down movement of the cap and piston tube. Furthermore, during installation, after the suction tube is inserted between the lower end of the piston tube and the lower end of the cap, its upper end abuts against the lower surface of each connecting part. At this point, the connecting part also limits the insertion depth of the suction tube, thus serving three purposes. This design improves the installation accuracy of the suction tube, ensuring that after the emulsion pump is installed on the bottle, the lower end of the suction tube is precisely positioned within the preset bottle. This prevents the lower end of the suction tube from being too high, causing drug residue, and also avoids it being too low, touching the bottle bottom, or bending, ensuring accurate drug dosage.

[0016] In the aforementioned emulsion pump, the cap further includes a cylindrical outer body integrally formed with the dispensing tube. The outer body is located outside the dispensing tube and is concentrically positioned with it. The diameter of the opening edge at the upper end of the cap gradually decreases from bottom to top, forming a constricted shape. The outer body slides vertically into the cap, with its outer circumferential surface abutting against the opening edge at the upper end of the cap. During operation, the cap and piston tube are connected and move up and down together. During this movement, the opening edge at the upper end of the cap abuts against the outer circumferential surface of the outer body, providing guidance for the outer body. Simultaneously, the connecting part also guides the piston tube. This design creates a double-guided structure, enabling stable movement of the cap and piston tube. Even without the piston, stable liquid dispensing is still ensured, thus improving hygiene while guaranteeing good operational stability and accurate dosage delivery, thereby ensuring therapeutic efficacy and medication safety in the pharmaceutical field.

[0017] In the aforementioned emulsion pump, both the upper and lower sections of the cap are cylindrical, with the upper section having a larger diameter than the lower section, and the two sections are connected by a middle section whose diameter gradually decreases from top to bottom. The lower end of the outer cylinder has several circumferentially spaced grooves, each vertically positioned and penetrating the lower end face of the outer cylinder. When the cap is pressed down, the lower end of the outer cylinder slides against the inner circumferential surface of the middle section of the cap. The vertical positioning and penetration of each groove create multiple elastic sheet structures at the lower end of the outer cylinder. Since the diameter of the middle section of the cap gradually decreases from top to bottom, these elastic sheets can deform inwards when the cap moves downwards. When the pressure is released, these elastic sheets return to their initial position, thereby pushing the cap back upwards. In this structure, a cap made of conventional food-safe plastic (PP or PE) replaces the metal spring to achieve the upward reset of the cap, avoiding the oxidation or rusting problems caused by long-term contact between the metal spring and the liquid. This makes the emulsion pump highly hygienic and can be effectively used in the pharmaceutical and food fields.

[0018] In the aforementioned emulsion pump, the inner circumferential surface of the cap has an annular stepped surface arranged circumferentially. This annular stepped surface is located at the connection between the lower and middle sections of the cap, and the upper end face of each connecting part is coplanar with the annular stepped surface. When the cap is pressed down, the lower end of the outer cylinder of the cap abuts against the annular stepped surface, thereby limiting the downward movement of the cap. The coplanarity of the upper end face of each connecting part with the annular stepped surface prevents the lower end of the outer cylinder from getting stuck in the gap between the cap and the piston tube, thus ensuring that the cap can smoothly return to its original position.

[0019] In the aforementioned emulsion pump, a strip groove 2 is formed in the middle between each pair of adjacent grooves 1 on the outer cylinder. The strip groove 2 is vertically oriented and extends through the lower end face of the outer cylinder. The length and width of the strip groove 2 are smaller than those of the groove 1. In the initial stage of cap pressing, the groove 1 functions, allowing the lower end of the outer cylinder to contract smoothly. As the cap approaches the annular step surface, the strip groove 2 further intervenes. The smaller groove 2 further enhances the deformation capacity of the elastic plate, thus providing a stronger restoring force in the later stages, allowing the cap to smoothly return to its original position when released. Simultaneously, due to the smaller size of the strip groove 2, each elastic plate maintains sufficient structural strength while providing restoring force, ensuring that the outer cylinder will not be damaged by excessive deformation during long-term use. Through this improvement, this emulsion pump eliminates the need for spring lifting, improving hygiene while also exhibiting good operational stability.

[0020] In the aforementioned emulsion pump, a circumferentially oriented, side-protruding limiting hook is integrally formed on the outer circumferential surface of the lower end of the outer cylinder. A circumferentially oriented limiting rib is integrally formed on the inner circumferential surface of the connection between the upper and middle sections of the cap. The limiting hook is located below and abuts against the limiting rib. By abutting against the limiting rib on the inner circumferential surface of the cap, the upward movement of the cap is effectively limited. This design eliminates the need for additional metal parts such as retaining rings to limit the upward movement of the cap, simplifying manufacturing and avoiding hygiene issues associated with metal parts, thus improving the hygiene of the emulsion pump.

[0021] In the aforementioned emulsion pump, an annular rib with an arc-shaped cross-section is integrally formed on the inner circumferential surface of the lower end of the screw cap. This annular rib abuts against the outer circumferential surface of the suction tube. After the suction tube is inserted into the screw cap, the annular rib can grip the suction tube tightly, improving the installation stability of the suction tube and preventing it from becoming loose during use. This ensures the installation accuracy of the suction tube, allowing the lower end of the suction tube to be precisely positioned within the bottle after the emulsion pump is installed on the bottle, thereby ensuring the accuracy of the drug dosage.

[0022] In the aforementioned emulsion pump, a strip-shaped, hollow dispensing nozzle extends laterally from the upper end of the outer cylinder. This dispensing nozzle is integrally formed with the outer cylinder and connected to the dispensing pipe. The integrally formed nozzle provides a more secure connection to the outer cylinder, improving sealing, preventing liquid leakage, and ensuring safety during use.

[0023] Compared with existing technologies, this emulsion pump has the following advantages:

[0024] 1. This emulsion pump significantly improves the hygiene of emulsion pump use and also features an anti-counterfeiting function, effectively identifying whether the emulsion pump is being used for the first time, thus ensuring high safety. This improvement allows this emulsion pump to well meet the stringent hygiene and safety requirements of the food and pharmaceutical industries, enabling its effective application in these fields.

[0025] 2. This emulsion pump uses a cap made of conventional food-safe plastic (PP or PE) instead of a metal spring to achieve the upward reset of the cap. The entire emulsion pump is an all-plastic product, that is, it is made entirely of plastic materials. This avoids the problem of oxidation or rust caused by long-term contact between the metal spring and the liquid, making this emulsion pump highly hygienic to use. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the emulsion pump.

[0027] Figure 2 This is a partial cross-sectional view of the emulsion pump before its first use.

[0028] Figure 3 This is a three-dimensional structural diagram of the screw cap and piston tube.

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

[0030] Figure 5 yes Figure 4 Sectional view of AA.

[0031] Figure 6 yes Figure 4 A cross-sectional view of BB.

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

[0033] Figure 8 yes Figure 7 Sectional view of AA.

[0034] Figure 9 This is a schematic diagram of the three-dimensional structure of the cap.

[0035] Figure 10 This is a bottom view of the cover.

[0036] Figure 11 This is a diagram showing the usage status of this emulsion pump after pressing down on the cap.

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

[0038] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0039] Example 1

[0040] like Figure 1 , Figure 2 and Figure 3As shown, this emulsion pump includes a screw cap 11, a suction tube 2, and a pressure cap 3 with a vertically arranged discharge tube 31. The screw cap 11 is tubular, and a piston tube 12 is concentrically arranged inside the screw cap 11. The two are connected by a point to form an integral structure. A cylindrical screw cap portion 14 is also integrally formed on the outer circumferential surface of the screw cap 11, and the inner circumferential surface of the screw cap portion 14 is provided with threads. The pressure cap 3 is vertically slidably inserted into the upper end of the screw cap 11, and the upper end of the piston tube 12 is inserted and connected to the discharge tube 31 of the pressure cap 3 to form an axial fixation. 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 and the piston tube 12 are slidably engaged and axially fixed with the screw cap 11.

[0041] Specifically, such as Figure 2 and Figure 5 As shown, three triangular connecting parts 13 protrude from the inner circumferential surface of the screw cap 11. All three connecting parts 13 are located at the center of the piston tube 12 along its axial direction. The lower side of each connecting part 13 abuts against the upper end face of the suction tube 2, thus limiting the insertion depth of the suction tube 2 and improving its installation accuracy. An annular 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 this annular rib 113 abuts against the outer circumferential surface of the suction tube 2.

[0042] like Figure 4 , Figure 7 and Figure 8 As shown, the connecting part 13 is triangular, with its base integrally formed on the inner circumferential surface of the cap 11 and its apex integrally formed on the outer circumferential surface of the piston tube 12. The connecting parts 13 are evenly spaced along the circumference of the piston tube 12. Among the triangular connecting parts 13, the apex part that connects to the outer circumferential surface of the piston tube 12 is a structurally weak point. Therefore, when the cap 3 is pressed down for the first time, the connection between the connecting part 13 and the outer circumferential surface of the piston tube 12 will break.

[0043] like Figure 4 and Figure 6 As shown, a one-way valve 121, which allows liquid to flow only upwards, is integrally formed inside the piston tube 12. This one-way valve 121 is plate-shaped, with its upper surface being spherical. The one-way valve 121 has three circumferentially spaced sector-shaped blades 121a. Each sector-shaped blade 121a has a thinner wall near the axis of the piston tube 12, allowing it to warp upwards. When the sector-shaped blade 121a tends to warp downwards, its outer edge presses tightly against the inner circumferential surface of the piston tube 12, thus preventing it from swinging downwards. Therefore, the liquid can only flow upwards through the one-way valve 121 and cannot flow downwards. Alternatively, the one-way valve 121 inside the piston tube 12 can also be a duckbill one-way valve 121.

[0044] like 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] This emulsion pump is connected to the bottle body via a screw cap 14 on the outer circumferential surface of the screw cap 11. After the connection is made, the screw cap 11 is fixed relative to the bottle body.

[0049] like Figure 2 As shown, when the emulsion pump leaves the factory, the cap 11, piston tube 12, and connecting part 13 are all injection molded in one piece. When used for the first time, since the liquid outlet tube 31 of the cap 3 is inserted and connected to the upper end of the piston tube 12 to form an axial fixation, when the cap 3 is pressed down, the cap 11 is fixed to the bottle body, and the cap 3 will push the piston tube 12 downward, so that the connecting part 13 bears the pressing pressure. Finally, all connecting parts 13 will break simultaneously under the action of pressing pressure. At this time, the operator will receive obvious force feedback and know that the emulsion pump is being used for the first time, thus giving this emulsion pump an "anti-counterfeiting" function.

[0050] like Figure 11 As shown, after the connection between the connecting part 13 and the piston tube 12 breaks, if the cap 3 is pressed down, the cap 3 will move downwards along with the piston tube 12, thereby compressing the internal space of the bottle and increasing the internal pressure, eventually making the internal pressure greater than the external pressure. 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 into the upper space of the one-way valve 121. At the same time, the liquid that was originally in the upper space of the one-way valve 121 is discharged from the outlet 33.

[0051] When the pressure cap 3 is released, the elastic plate on the outer cylinder 32 will return to its initial position, thereby pushing the pressure cap 3 upwards to reset as shown. Figure 2 The state shown. During the reset process, the presence of the one-way valve 121 inside the piston tube 12 prevents the liquid entering the upper space of the one-way valve 121 from flowing back into the bottle, ensuring that this part of the liquid is discharged from the outlet 33 when the cap 3 is pressed again.

[0052] Example 2

[0053] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that there are 6 connecting parts 13, and each connecting part 13 is evenly spaced along the circumference of the piston tube 12.

[0054] Example 3

[0055] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that there are 4 connecting parts 13, and each connecting part 13 is evenly spaced along the circumference of the piston tube 12.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0057] Although this document frequently uses terms such as 11, screw cap; 111, annular stepped surface; 112, limiting rib; 113, annular rib; 12, piston tube; 121, one-way valve; 121a, fan-shaped blade; 13, connecting part; 14, screw cap part; 2, suction tube; 3, pressure cap; 31, discharge tube; 32, outer cylinder; 321, strip groove one; 322, strip groove two; 323, limiting hook part; 33, discharge nozzle, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. An emulsion pump comprising a screw cap (11), a suction tube (2), and a pressure cap (3) having a vertically arranged discharge tube (31), wherein the screw cap (11) is tubular, characterized in that, A piston tube (12) is concentrically arranged inside the cap (11), and the two are connected by a point to form an integral structure. The pressure cap (3) is vertically slidably inserted into the upper end of the cap (11), and the upper end of the piston tube (12) is inserted into and connected to the liquid outlet tube (31) of the pressure cap (3) to form an axial fixation. 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 cap (11). The suction tube (2) and the piston tube (12) are connected in a straight line. The screw cap (11) is slidably fitted and axially fixed with the screw cap (11). Several triangular connecting parts (13) are protruding on the inner circumferential surface of the screw cap (11). Each connecting part (13) is evenly spaced along the circumference of the screw cap (11). The bottom edge of the connecting part (13) is integrally formed on the inner circumferential surface of the screw cap (11), and the apex is integrally formed on the outer circumferential surface of the piston tube (12). The lower side of each connecting part (13) abuts against the upper end face of the suction tube (2).

2. The emulsion pump according to claim 1, characterized in that, The number of connecting parts (13) is at least three, and several connecting parts (13) are located in the middle of the piston tube (12) along the axial direction.

3. The emulsion pump according to claim 1 or 2, characterized in that, 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). The diameter of the opening edge of the upper end of the cap (11) gradually decreases from bottom to top to form a constricted shape. The outer cylinder (32) is slidably inserted into the cap (11) in the vertical direction and the outer circumferential surface of the outer cylinder (32) is close to the opening edge of the upper end of the cap (11).

4. The emulsion pump according to claim 3, characterized in that, The upper and lower sections of the cap (11) are both cylindrical. The diameter of the upper section is larger than that of 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) is provided with several circumferentially spaced strip grooves (321). Each strip groove (321) is vertically arranged and penetrates the lower end face of the outer cylinder (32). 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).

5. The emulsion pump according to claim 4, characterized in that, The inner circumferential surface of the cap (11) has an annular step surface (111) arranged in the circumferential direction. The annular step surface (111) is located at the connection between the lower section and the middle section of the cap (11). The upper end surface of each connecting part (13) is coplanar with the annular step surface (111).

6. The emulsion pump according to claim 4, characterized in that, In the circumferential direction of the outer cylinder (32), a strip groove (322) is provided in the middle between each of the two adjacent strip grooves (321). The strip groove (322) is arranged vertically and penetrates the lower end face of the outer cylinder (32). The length and width of the strip groove (322) are smaller than the length and width of the strip groove (321).

7. The emulsion pump according to claim 4, characterized in that, The outer cylindrical body (32) has an integrally formed circumferentially arranged and side-protruding limiting hook (323) on the outer peripheral surface of the lower end. The inner peripheral surface of the connection between the upper section and the middle section of the screw cap (11) has an integrally formed circumferentially arranged limiting rib (112). The limiting hook (323) is located below the limiting rib (112) and abuts against the limiting rib (112).

8. The emulsion pump according to claim 1 or 2, characterized in that, The outer circumferential surface of the cap (11) is integrally formed with a cylindrical cap portion (14), and the inner circumferential surface of the lower end of the cap (11) is integrally formed with an annular rib (113) with an arc-shaped cross section, and the annular rib (113) abuts against the outer circumferential surface of the suction tube (2).

9. The emulsion pump according to claim 3, characterized in that, The upper end of the outer cylinder (32) extends to the side into a strip-shaped, hollow liquid outlet (33), which is integrally formed with the outer cylinder (32) and connected to the liquid outlet pipe (31).

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