Product dispenser

Abstract

A precompression valve used in a product dispenser. The precompression valve comprises a valve member and a valve seat, wherein the valve member is detachably fitted in the valve seat, and the valve member comprises a sealing portion and an elastic portion, the elastic portion applying a biasing force to the sealing portion, such that the sealing portion is fitted in the valve seat. The elastic portion is configured in such a way that when the sealing portion is fitted in the valve seat to enable the precompression valve to be in a closed state, the elastic portion is not stressed and compressed so as to be in an initial shape thereof, and when the sealing portion is compressed to move away from the valve seat, the elastic portion is compressed to deform so as to accumulate a resilience force. The present application further relates to a product dispenser comprising the precompression valve. By means of the structure of the precompression valve, yield deformation of the elastic portion due to being compressed for a long period of time can be avoided, such that the service life of the precompression valve and the product dispenser comprising the precompression valve is prolonged.

Description

A product dispenser Technical Field

[0001] The present application relates to the field of liquid and semi-liquid product packaging, and in particular to a product dispenser arranged on a container containing the product. Background Art

[0002] Product dispensers are widely used in industries such as cosmetics, pharmaceuticals, and food. They are primarily mounted on containers holding liquid and semi-liquid products to dispense the product from the container for consumer use. Common examples of product dispensers include lotion pumps, spray pumps, vacuum pumps, and the nozzles on eye dropper bottles.

[0003] Some types of product dispensers include a pre-pressure valve. This valve is a key component in these dispensers. It allows the product in the container to accumulate to a predetermined pressure before it can be dispensed. This ensures that the product is dispensed from the container at a desired pressure and velocity, or that the product exiting the container has a certain atomization effect.

[0004] Traditional preload valves primarily work by pressing a small metal spring against a piston. However, with increasing environmental protection requirements and the need for fully plasticized product dispensers, these metal springs are no longer suitable for use in dispensers like spray pumps. Consequently, the industry has experimented with replacing traditional metal springs with plastic springs. However, during use, it was discovered that plastic springs lacked sufficient resilience and, under prolonged pressure, yielded and deformed, further weakening or even eliminating the rebound force, leading to preload valve failure.

[0005] Furthermore, in packaging such as eye drop bottles, after the liquid droplets are squeezed out, ambient air can flow back into the container, potentially carrying microorganisms and dust into the container, where they can come into contact with the product and contaminate it. Therefore, product dispensers such as the dropper nozzles on eye drop bottles are best equipped with a preload valve, preferably implemented using a plastic spring. However, the prior art does not address how to implement a preload valve using a plastic spring in the dropper nozzles of eye drop bottles.

[0006] Therefore, there is a need for further improvement of the structure of the product dispenser to overcome the above technical problems existing in the prior art.

[0007] Summary of the Invention

[0008] The present invention is designed to address the technical problems existing in the prior art described above. It aims to provide an improved product dispenser, wherein the pre-compression valve in the dispenser effectively applies pre-compression to the dispensed product. Furthermore, the elastic component of the pre-compression valve has a relaxation function, thereby overcoming the problem of loss of pre-compression function due to prolonged pressure.

[0009] The product dispenser of the present invention is mounted on a container and is used to dispense product from the container to the outside. The product dispenser includes a product outlet and a product distribution channel from the container to the product outlet. The product dispenser is provided with a pre-load valve, which is mounted in the product distribution channel and is made of a non-metallic material. The pre-load valve includes a valve member and a valve seat. The valve member can be detachably engaged in the valve seat. The valve member includes a sealing portion and an elastic portion. The elastic portion applies a biasing force to the sealing portion to engage the valve seat. The elastic portion is configured such that when the sealing portion engages in the valve seat to close the pre-load valve, the elastic portion assumes an initial shape. When the sealing portion is subjected to pressure and moves away from the valve seat, the elastic portion is compressed and deformed, accumulating a rebound force. Here, the so-called "initial shape" of the elastic portion refers to the shape of the elastic portion when it is in an undeformed, relaxed state.

[0010] With this product dispenser structure, the pre-compression valve is positioned within the product dispensing channel, where the product is dispensed from the container. This effectively pre-compresses the dispensed product, resulting in a better atomization effect. Furthermore, the elastic portion of the pre-compression valve element is relatively relaxed when the pre-compression valve is closed, and is only compressed and deformed when the product is pumped outward. This prevents the elastic portion from yielding due to prolonged pressure. Thus, even if the elastic portion is made of plastic, it can have a longer service life, thereby increasing the lifespan of the pre-compression valve.

[0011] In a specific structure, the valve seat includes a sealing section and a release section. The inner diameter of the sealing section is smaller than the outer diameter of the sealing portion of the valve member, so that the sealing portion can be sealed and fitted in the sealing section. The inner diameter of the release section is larger than the outer diameter of the sealing portion, so that when the sealing portion of the valve seat moves to the release section, the pre-compression valve opens.

[0012] In another structure, the valve seat includes an inner cylindrical surface having an inner diameter smaller than an outer diameter of a sealing portion of the valve member so that the sealing portion can sealably cooperate with the inner cylindrical surface, wherein at least one groove is formed in the inner cylindrical surface.

[0013] As for the structure of the valve component, the valve component may further include a supporting portion, and the elastic portion is connected between the supporting portion and the sealing portion.

[0014] Alternatively, the valve member has a sealing head located at the upper end of the valve member, and the elastic portion includes at least two elastic strips arranged at the lower end of the valve member.

[0015] Preferably, the elastic part includes any one of the following structures: at least one bow-shaped elastic strip, a connecting section including a circular middle part and two ends of the circular part, an elastic strip with a zigzag structure, a bellows, a plurality of horizontally arranged elastic strips, a plurality of obliquely extending elastic strips, and a coil spring.

[0016] In addition, preferably, the sealing portion is formed in a tapered shape, and the valve seat includes an inclined surface matching the tapered shape of the sealing portion.

[0017] In a specific structure, the product dispenser includes a pressure head, a sleeve, a cylinder and a piston rod. The sleeve is fixedly connected to the cylinder, the piston rod is arranged below the pressure head, and the product distribution channel includes a channel in the piston rod and a channel in the pressure head.

[0018] The pre-compression valve is arranged in a channel inside the piston rod, wherein the piston rod includes a first segment and a second segment, a step portion is formed on the inner surface of the first segment, the valve member is supported on the step portion, and the upper part of the internal chamber of the second segment forms a valve seat.

[0019] Alternatively, the top of the valve member of the pre-compression valve is supported on the top of the pressure head, the valve seat is formed in the top of the piston rod, or the valve seat is formed in the inner surface of the middle portion of the piston rod.

[0020] Alternatively, the pre-compression valve is arranged in a passage in the pressure head, wherein the valve seat is formed in the passage of the pressure nozzle of the pressure head.

[0021] In another embodiment, the product dispenser is used on an eye drop bottle and includes a spray head, a pre-compression valve is installed in the spray head, and a valve seat is formed in a spray head outlet passage of the spray head.

[0022] Preferably, the eye drop bottle includes a deformable capsule, the open end of the deformable capsule is connected to the nozzle, and an air inlet valve is also provided on the eye drop bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings illustrate non-limiting preferred embodiments of the present invention, and the features and advantages of the present invention will become more apparent when combined with the accompanying drawings.

[0024] FIG1 shows a cross-sectional view of a product dispenser according to a first embodiment of the present application, wherein the product dispenser is in an unpressed state.

[0025] FIG. 2 shows another cross-sectional view of the product dispenser of the first embodiment of the present application, wherein the product dispenser is pressed downward.

[0026] FIG. 3 shows an enlarged partial view of the product dispenser of FIG. 1 and FIG. 2 , including a pre-compression valve.

[0027] 4a and 4b show a cross-sectional view and a perspective view of an exemplary structure of a valve component of a pre-compression valve.

[0028] 5a and 5b show a cross-sectional view and a perspective view of another exemplary structure of a valve component of a pre-compression valve.

[0029] 6a and 6b show a cross-sectional view and a perspective view of another exemplary structure of a valve component of a pre-compression valve.

[0030] 7a and 7b show a cross-sectional view and a perspective view of another exemplary structure of a valve component of a pre-compression valve.

[0031] 8a and 8b show a cross-sectional view and a perspective view of another exemplary structure of a valve component of a pre-compression valve.

[0032] 9a and 9b show a cross-sectional view and a perspective view of another exemplary structure of a valve component of a pre-compression valve.

[0033] 10a and 10b show a cross-sectional view and a perspective view of another exemplary structure of a valve component of a pre-compression valve.

[0034] FIG. 11 is a cross-sectional view showing an exemplary structure of a piston rod forming a valve seat of a pre-compression valve.

[0035] FIG. 12 a shows a cross-sectional view of another exemplary structure of a piston rod forming a valve seat of a pre-compression valve.

[0036] FIG. 12 b shows a perspective view of the piston rod of FIG. 12 a .

[0037] FIG. 13 shows a cross-sectional view of a modified structure of a product dispenser.

[0038] FIG. 14 shows a cross-sectional view of a product dispenser according to a second embodiment of the present application, wherein the product dispenser is in an unpressed state.

[0039] FIG. 15 a shows another cross-sectional view of the product dispenser of the second embodiment of the present application, wherein the product dispenser is pressed downward.

[0040] FIG15 b shows a partial enlarged view of the product dispenser of the second embodiment, in which the pre-compression valve provided in the pressure nozzle of the pressure head is shown.

[0041] FIG16 is a cross-sectional view showing an exemplary structure of a valve component of a pre-compression valve.

[0042] FIG17 is a cross-sectional view showing another exemplary structure of a valve component of a pre-compression valve.

[0043] FIG. 18 is a cross-sectional view showing an exemplary structure of a pressure head forming a valve seat of a pre-compression valve.

[0044] FIG. 19 is a cross-sectional view showing another exemplary structure of a pressure head forming a valve seat of a pre-compression valve.

[0045] FIG. 20 shows a cross-sectional view of a product dispenser according to a third embodiment of the present application.

[0046] FIG. 21 a shows a cross-sectional view of a product dispenser according to a fourth embodiment of the present application.

[0047] FIG. 21 b shows an enlarged partial view of the product dispenser of FIG. 21 a , wherein the pre-compression valve is in a closed state.

[0048] FIG. 22 a shows another cross-sectional view of the product dispenser according to the fourth embodiment of the present application.

[0049] FIG. 22 b shows an enlarged partial view of the product dispenser of FIG. 22 a , wherein the pre-compression valve is in an open state.

[0050] Figure 23 shows a cross-sectional view of the spray head of the product dispenser of Figures 21a and 22a.

[0051] 24 shows a front view of the valve member of the pre-compression valve of the product dispenser of FIGS. 21 a and 22a.

[0052] FIG. 25 a shows a cross-sectional view of the intake valve of FIG. 21 a and FIG. 22 a .

[0053] FIG. 25 b shows a perspective view of the intake valve of FIG. 25 a .

[0054] FIG. 26 a shows a cross-sectional view of a product dispenser according to a fifth embodiment of the present application, wherein the product dispenser is in an unpressed state.

[0055] FIG. 26 b is a partial enlarged view of the product dispenser of FIG. 26 a , showing the pre-compression valve in a closed state.

[0056] FIG. 27 a shows another cross-sectional view of the product dispenser of the fifth embodiment, wherein the product dispenser is pressed downwards.

[0057] FIG. 27 b is a partial enlarged view of the product dispenser of FIG. 27 a , showing the pre-compression valve in an open state.

[0058] (Explanation of Reference Symbols) 100, 200, 300, 400, 500 Product dispenser 110, 210, 310, 510 Press head 111, 211 Press nozzle 120, 520 Socket 130, 230, 330, 430, 530 Pre-compression valve 131, 231, 331, 431, 531 Valve body 132, 232, 332, 432, 532 Valve seat 133, 233, 533 Support portion 134, 234, 534, 434 Sealing portion 135, 235, 535 Elastic portion 136, 236 Sealing section 137, 237 Release section 138, 238 Groove 140, 340, 540 Piston rod 141 First section 142 Second section 143 Step 150 Elastic reset mechanism 160 Cylinder 212 Nozzle 410 Nozzle 411 Nozzle outlet channel 420 Deformable capsule 433 Sealing head 440 Inlet valve 441 Inlet valve body 442valve plate DETAILED DESCRIPTION

[0059] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the drawings illustrate only preferred embodiments of the present invention and do not limit the scope of the present invention. Those skilled in the art may make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings. Furthermore, the technical features of the different embodiments described below may be arbitrarily combined with each other, provided that no contradiction exists. All of these combinations fall within the scope of protection of the present invention.

[0060] <First embodiment>

[0061] 1 to 13 show a product dispenser 100 according to a first embodiment of the present application. The product dispenser 100 is in the form of a press pump.

[0062] The product dispenser 100 includes a pressure head 110, a threaded sleeve 120, and a cylinder 160. The threaded sleeve 120 and the cylinder 160 are fixedly connected. The inner surface of the outer ring of the threaded sleeve 120 may be formed with a structure, such as an internal thread, which can mate with a structure, such as an external thread, on the mouth of a container, thereby securing the product dispenser 100 to the container. A piston rod 140 is disposed below the pressure head 120. A piston is disposed below the piston rod 140. The piston is interference-fitted with the inner surface of the cylinder 130, allowing for relative movement.

[0063] Product dispenser 100 also includes an elastic return mechanism 150, preferably made of plastic to facilitate environmentally friendly recycling. One end of elastic return mechanism 150 is supported on press head 110, and the other end is supported on mouthpiece 120. As a result, when press head 110 is pressed downward relative to mouthpiece 120, elastic return mechanism 150 deforms and accumulates a rebound force. When the pressure on press head 110 is removed, the rebound force of elastic return mechanism 150 returns press head 110 to its original, upward position.

[0064] The product dispenser 100 is also equipped with a pre-compression valve 130, which can be made of a non-metallic material, such as an elastic material like plastic or rubber. The pre-compression valve 130 is located in the product dispensing passage from the product container to the pressure head 110, where the product is ultimately dispensed. In the specific structure of the first embodiment, the pre-compression valve 130 is located in the passage from the interior of the cylinder 160 to the nozzle 111 of the pressure head 110, specifically in the passage within the piston rod 140.

[0065] The piston rod 140 includes two parts, namely a first segment 141 and a second segment 142 . The first segment 141 and the second segment 142 are connected together by a method such as a convex ring-groove structure or a threaded structure.

[0066] 3 shows a partial enlarged view of a portion of the product dispenser 100 shown in FIG1 and FIG2 including the pre-compression valve 130. The pre-compression valve 130 includes a valve body 131 and a valve seat 132 formed in an inner passage of the piston rod 140.

[0067] 4a and 4b illustrate an exemplary structure of a valve body 131 of a pre-compression valve 130. The valve body 131 includes a support portion 133 located at its upper portion and a sealing portion 134 located at its lower portion. An elastic portion 135 is disposed between the support portion 133 and the sealing portion 134. The elastic portion 135 may include at least one, and preferably multiple, arcuate elastic strips.

[0068] Figures 5a to 10b illustrate valve bodies 131 with alternative structures. For example, the elastic portion 135 in the valve body 131 shown in Figures 5a and 5b includes a circular middle portion and connecting sections at both ends of the circular middle portion. The elastic portion 135 of the valve body 131 shown in Figures 6a and 6b has a generally zigzag structure. The elastic portion 135 of the valve body 131 shown in Figures 7a and 7b has a generally bellows structure. The elastic portion 135 of the valve body 131 shown in Figures 8a and 8b includes a plurality of generally horizontally arranged elastic strips. The valve body 131 shown in Figures 9a and 9b includes a plurality of obliquely extending elastic portions 135. The valve body 131 shown in Figures 10a and 10b includes a sealing portion 134 and an elastic portion 135 in the form of a coil spring disposed on the sealing portion 134. This valve body 131 does not include the support portion of the previous embodiment of the valve body 131, but instead uses the top of the coil spring as the support portion.

[0069] Returning to Figures 2 and 3, a step portion 143 is formed on the inner surface of the first section 141 of the piston rod 140, and the supporting portion 133 of the valve body 131 is supported on the step portion 143, or, in the structure shown in Figures 10a and 10b, the top of the elastic portion 135 in the form of a coil spring is supported on the step portion 143.

[0070] A valve seat 132 is formed in the upper portion of the internal chamber of the second section 142, into which a sealing portion 134 can be releasably engaged. In the standby state, the elastic force of the resilient portion 135 biases the sealing portion 134 in a position engaged with the valve seat 132, thereby closing the pre-compression valve 130. When the ram 110 is pressed downward, the pressure of the product within the cylinder 160 increases. When the pressure reaches a predetermined threshold, the sealing portion 134 overcomes the elastic force of the resilient portion 135 and moves upward, disengaging from the valve seat 132. The pre-compression valve 130 opens, allowing the product to flow through the passage within the piston rod 140 into the nozzle 111 of the ram 110 and be dispensed for use.

[0071] Regarding the aforementioned pre-compression valve 130, when its sealing portion 134 engages with the valve seat 132, closing the pre-compression valve 130, the elastic portion 135 assumes its initial shape. That is, the elastic portion 135 is not deformed by force and is therefore in a relaxed state. However, when the sealing portion 134 moves upward under the action of product pressure and disengages from the valve seat 132, the elastic portion 135 is compressed and deformed, thereby accumulating a rebound force within the elastic portion 135. This allows the pre-compression valve 130 to return to its closed state after the product pressure in the cylinder 160 drops.

[0072] For the pre-compression valve 130 of the above structure, in the standby state, the elastic portion 135 is in a relatively relaxed state, which can prevent the elastic portion 135 from yielding and deforming due to long-term pressure, thereby preventing the pre-compression valve 130 from failing.

[0073] The valve seat 132 is formed at the upper end of the second section 142 of the piston rod 140. FIG11 shows an embodiment of the valve seat 132, in which the valve seat 132 includes a sealing section 136 and a release section 137, with the sealing section 136 located below the release section 137. The inner diameter of the sealing section 136 is slightly smaller than the outer diameter of the sealing portion 134. When the sealing portion 134 extends into the sealing section 136, an interference fit is formed between the sealing section 136 and the sealing portion 134, thereby forming a seal. The inner diameter of the release section 137 is set to be larger than the outer diameter of the sealing portion 134. When the sealing portion 134 rises from the sealing section 136 to the release section 137, a gap is formed between the sealing portion 134 and the release section 137, allowing the product to flow out through the pre-compression valve 130, thereby opening the pre-compression valve 130.

[0074] Figures 12a and 12b illustrate another embodiment of the valve seat 132. In this exemplary structure, the valve seat 132 is formed at the upper end of the second segment 142, specifically as an inner cylindrical surface formed at the upper end of the second segment 142. The inner diameter of this inner cylindrical surface is slightly smaller than the outer diameter of the sealing portion 134 of the valve body 131, allowing the sealing portion 134 to have an interference fit within the valve seat 132. Furthermore, at least one groove 138 is formed in the upper portion of the valve seat 132. This groove 138 extends all the way to the top of the second segment 142 and communicates with the internal passage of the first segment 141.

[0075] In this structure of valve seat 132, when sealing portion 134 of valve body 131 fits into valve seat 132 and extends below groove 138, a seal is formed between sealing portion 134 and the inner wall of valve seat 132, thereby closing preload valve 130. When valve body 131 moves upward under pressure, overcoming the elastic force of elastic portion 135, and when the lower end of sealing portion 134 moves above the lower end of groove 138, the internal passage of second segment 142 communicates with the internal passage of first segment 141 through groove 138, thereby opening preload valve 130.

[0076] 1 and 2 , the first segment 141 of the piston rod 140 is integrally formed at the lower portion of the ram 110. Alternatively, the first segment 141 may also be formed as a separate component and subsequently mounted at the lower portion of the ram 110, as shown in FIG13 .

[0077] <Second embodiment>

[0078] Figures 14 to 19 show a product dispenser 200 according to a second embodiment of the present invention. Unless otherwise specified or conflicting, the specific structures described above with respect to the first embodiment also apply to the second embodiment. The following describes in detail the structures of the second embodiment that differ from the first embodiment.

[0079] In the second embodiment, a pre-compression valve 230 is provided in the product dispenser 200 and is installed in a passage in the pressure nozzle 211 of the pressure head 210. Specifically, as more clearly shown in FIG15b, the pre-compression valve 230 includes a valve body 231 and a valve seat 232.

[0080] As shown in FIG16 , an exemplary structure of a valve body 231 includes a support portion 233, a sealing portion 234, and an elastic portion 235 disposed between the support portion 233 and the sealing portion 234. The elastic portion 235 may be, for example, a plurality of bow-shaped elastic strips. Alternatively, as shown in FIG17 , the elastic portion 235 of the valve body 231 may be in the form of a bellows. Alternatively, the valve body 231 may also adopt the structure of the valve body 131 disclosed above in the first embodiment. The support portion 233 of the valve body 231 abuts against the nozzle 212 located at the outlet of the nozzle 211, and the sealing portion 234 may fit within the valve seat 232.

[0081] A valve seat 232 is formed in the passage of the nozzle 211. The inner diameter of at least a portion of the internal passage of the nozzle 211 is smaller than the outer diameter of the sealing portion 234, thereby forming the valve seat 232. In the standby state, the valve body 231 can be sealingly fitted into the valve seat 232, thereby closing the pre-compression valve 230. As the ram 210 is depressed, the pressure of the product in the product dispenser 200 increases. This pressure pushes the sealing portion 234 away from the valve seat 232, overcoming the elastic force of the elastic portion 235 and thereby opening the pre-compression valve 230.

[0082] Similar to the first embodiment, the valve seat 232 can also adopt different structural forms. For example, in the structure shown in Figure 18, the valve seat 232 formed in the internal passage of the pressure nozzle 211 includes two parts: a sealing section 236 distal to the outlet of the internal passage and a release section 237 proximal to the outlet. The inner diameter of the sealing section 236 is configured to be smaller than the outer diameter of the sealing portion 234, while the inner diameter of the release section 237 is configured to be larger than the outer diameter of the sealing portion 234. Thus, when the sealing portion 234 extends into the sealing section 236, a seal is formed between the sealing portion 234 and the sealing section 236, closing the preload valve 230. When the sealing portion 234 disengages from the sealing section 236 and enters the release section 237, a gap is created between the sealing portion 234 and the release section 237, thereby opening the preload valve 230.

[0083] Alternatively, as shown in FIG19 , the valve seat 232 may include an inner cylindrical surface having a uniform inner diameter, in which a groove 238 is formed. When the sealing portion 234 extends into the valve seat 232 away from the outlet of the nozzle 211 and covers the groove 238, the pre-compression valve 230 is closed. When the sealing portion 234 moves toward the outlet of the nozzle 211 under the action of product pressure until the groove 238 is exposed to the internal passage of the nozzle 211, the pre-compression valve 230 opens.

[0084] <Third embodiment>

[0085] FIG20 shows a product dispenser 300 according to a third embodiment of the present application. Unless otherwise specified or conflicting, the specific structures described above with respect to the first and second embodiments also apply to the third embodiment. The structures of the third embodiment that differ from the first and second embodiments will be described in detail below.

[0086] As shown in FIG20 , the product dispenser 300 is provided with a pre-compression valve 330, which includes a valve body 331 and a valve seat 332. The valve seat 332 is formed in the piston rod 340 of the product dispenser 300. Specifically, in the third embodiment, the piston rod 340 is a one-piece structure, and the valve seat 332 is formed at the top of the piston rod 340. Specifically, the upper end of the pre-compression valve 330 is supported on the top inner surface of the pressure head 310, and the lower end of the pre-compression valve 330 (or its lower sealing portion) is capable of fitting within the top of the piston rod 340.

[0087] <Fourth embodiment>

[0088] Figures 21a-25b illustrate a product dispenser 400 according to a fourth embodiment of the present application. This product dispenser 400 is mounted on an eye drop bottle. Unless otherwise specified or conflicting, the specific structures described above with respect to the first through third embodiments also apply to the fourth embodiment. The following details the structures of the fourth embodiment that differ from the first through third embodiments.

[0089] The product dispenser 400 of the fourth embodiment is applied to an eye drop bottle and includes a spray head 410 and a pre-compression valve 430 installed in the spray head 410 .

[0090] Figures 23 and 24 respectively illustrate the detailed structures of the spray head 410 and pre-compression valve 430. As shown in the figures, the pre-compression valve 430 includes a valve member 431 and a valve seat 432. The valve member 431 has a sealing head 433 at its upper end and an elastic portion 434 at its lower end. The elastic portion 434 includes at least two elastic strips.

[0091] The valve seat 432 is formed in the nozzle outlet channel 411 of the nozzle 410, for example, the valve seat 432 is formed at the top of the nozzle outlet channel 411. The sealing head 433 can be sealed with the valve seat 432 (see Figure 21b) or disengaged (see Figure 22b), thereby closing or opening the pre-compression valve 430.

[0092] The spray head 410 of the product dispenser 400 is fixedly mounted at the opening of the eye drop bottle 2. When no external force is applied to the eye drop bottle 2, the elastic portion 434 is in its initially relaxed state, biasing the valve member 431 to a position where the sealing head 433 seals against the valve seat 432, thereby closing the preload valve 430, as shown in FIG21b. When a user squeezes the eye drop bottle 2, the rising pressure within the bottle causes the valve member 431 to overcome the elastic force of the elastic portion 434 and move upward, disengaging the sealing head 433 from the valve seat 432 and opening the preload valve 430, as shown in FIG22b.

[0093] Returning to Figures 21a and 22a, preferably, a deformable capsule 420 is further provided in the eye drop bottle 2. The open end of the deformable capsule 420 is connected to the spray head 410 and is used to contain the product. Furthermore, an air inlet valve 440 is also provided on the eye drop bottle 2. This air inlet valve 440 is a one-way valve that allows external air to enter the space outside the deformable capsule 420 in the eye drop bottle 2, thereby compensating for the negative pressure generated within the eye drop bottle 2 due to dispensing the product.

[0094] 25a and 25b illustrate an exemplary structure of an air inlet valve 440. The air inlet valve 440 includes an air inlet valve body 441 and a valve plate 442 coupled to the air inlet valve 440. The valve plate 442 is bendable relative to the air inlet valve body 441 toward the interior of the eye drop bottle 2 to open or close the air inlet valve 440.

[0095] <Fifth embodiment>

[0096] Figures 26a to 27b illustrate a product dispenser 500 according to a fifth embodiment of the present application. Unless otherwise specified or conflicting, the specific structures described above with respect to the first to fourth embodiments also apply to the fifth embodiment. The following details the structures of the fifth embodiment that differ from the first to fourth embodiments.

[0097] The product dispenser 500 includes a pressure head 510, a toothed sleeve 520, and a piston rod 540. A pre-compression valve 530 is disposed in the piston rod 540. The pre-compression valve 530 includes a valve body 531 and a valve seat 532. The valve body 531 has a support portion 533, a sealing portion 534, and an elastic portion 535 connected between the support portion 533 and the sealing portion 534. The support portion 533 is an elongated member, the top end of which is supported on the top of the pressure head 510. The valve seat 532 is formed on the inner surface of the middle portion of the piston rod 540. The sealing portion 534 can be releasably engaged with the valve seat 532.

[0098] In the preferred structure shown in the figure, the sealing portion 534 is a downwardly tapered shape, and accordingly, the valve seat 532 is also a slope formed on the inner wall of the piston rod 540. The shape of the slope matches the tapered shape of the sealing portion 534. The structure of the slope matching can be seen more clearly in Figures 26b and 27b.

[0099] In the structure shown in the figure, piston rod 540 is two-stage. Of course, piston rod also can be formed as a one-piece component.

Claims

1. A product dispenser, the product dispenser being mounted on a container and being used to dispense a product from the container to the outside, wherein: The product dispenser comprises a product outlet and a product dispensing channel from the container to the product outlet, and is characterized in that: A pre-pressure valve is provided in the product dispenser, and the pre-pressure valve is installed in the product distribution channel. The pre-pressure valve is made of non-metallic material, and includes a valve member and a valve seat. The valve member can be detachably engaged in the valve seat, and the valve member includes a sealing portion and an elastic portion, wherein the elastic portion applies a biasing force to the sealing portion so that the sealing portion is engaged in the valve seat. It is characterized in that the elastic portion is configured such that when the sealing portion is engaged in the valve seat so that the pre-pressure valve is in a closed state, the elastic portion assumes an initial shape, and when the sealing portion is subjected to pressure and moves away from the valve seat, the elastic portion is compressed and deformed to accumulate a rebound force.

2. The product dispenser according to claim 1, characterized in that The valve seat comprises a sealing section and a release section, the inner diameter of the sealing section is smaller than the outer diameter of the sealing portion of the valve member, so that the sealing portion can be sealingly fitted in the sealing section, and the inner diameter of the release section is larger than the outer diameter of the sealing portion, so that when the sealing portion of the valve seat moves to the release section, the pre-pressure valve opens.

3. The product dispenser according to claim 1, characterized in that The valve seat comprises an inner cylindrical surface, the inner diameter of which is smaller than the outer diameter of the sealing portion of the valve member, so that the sealing portion can seal with the inner cylindrical surface, wherein at least one groove is formed in the inner cylindrical surface.

4. The product dispenser according to any one of claims 1 to 3, characterized in that: The valve member further includes a supporting portion, and the elastic portion is connected between the supporting portion and the sealing portion.

5. The product dispenser according to any one of claims 1 to 3, characterized in that: The valve member has a sealing head, which is located at the upper end of the valve member, and the elastic part includes at least two elastic strips arranged at the lower end of the valve member.

6. The product dispenser according to any one of claims 1 to 3, characterized in that: The elastic part includes any one of the following structures: at least one bow-shaped elastic strip, a connecting section including a circular middle part and two ends of the circular part, an elastic strip with a zigzag structure, a bellows, a plurality of horizontally arranged elastic strips, a plurality of obliquely extending elastic strips, and a coil spring.

7. The product dispenser of claim 1, wherein: The sealing portion is formed in a tapered shape, and the valve seat includes an inclined surface matching the tapered shape of the sealing portion.

8. The product dispenser of claim 1, wherein: The product dispenser includes a pressure head, a toothed sleeve, a cylinder and a piston rod. The toothed sleeve is fixedly connected to the cylinder. The piston rod is arranged below the pressure head. The product distribution channel includes a channel in the piston rod and a channel in the pressure head.

9. The product dispenser of claim 8, wherein: The pre-compression valve is arranged in the channel in the piston rod, wherein the piston rod includes a first section and a second section, a step portion is formed on the inner surface of the first section, the valve member is supported on the step portion, and the upper portion of the internal chamber of the second section forms the valve seat.

10. The product dispenser of claim 8, wherein: The top of the valve member of the pre-compression valve is supported on the top of the pressure head, and the valve seat is formed in the top of the piston rod, or the valve seat is formed in the inner surface of the middle portion of the piston rod.

11. The product dispenser of claim 8, wherein: The pre-compression valve is arranged in a passage in the pressure head, wherein the valve seat is formed in the passage of the pressure nozzle of the pressure head.

12. The product dispenser of claim 1, wherein: The product dispenser is used on an eye drop bottle and comprises a spray head, the pre-compression valve is installed in the spray head, and the valve seat is formed in a spray head outlet channel of the spray head.

13. The product dispenser of claim 12, wherein: The eye drop bottle comprises a deformable capsule, the opening end of the deformable capsule is connected to the spray head, and an air inlet valve is also arranged on the eye drop bottle.

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