A rod seal and a drying chamber

Abstract

The utility model discloses a kind of rod sealing element and drying chamber, including sealing ring body, tensile arm and boss;The tensile arm is respectively arranged at the both sides of the sealing ring body and extends downward;The boss is circumferentially spaced apart and arranged at the upper end surface of the sealing ring body, and gas passage is formed between adjacent bosses.The rod sealing element has good tensile property, can meet long-term dynamic sealing requirements;It has the function of moisture absorption while sealing, can dry the passage of valve stem within a certain range, limit or basically eliminate the deposition or accumulation of pharmaceutical preparations in the passage.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a rod seal and a drying chamber. Background Technology

[0002] It is well known to treat patients with medications contained in aerosols, for example, in the treatment of respiratory diseases. It is also known that medications for such treatment are contained in aerosols and administered to patients via an inhalation device comprising a mouthpiece and a housing containing an aerosol canister. Such inhalation devices are commonly referred to as metered-dose inhalers (MDIs). The aerosol canister used in such devices is designed to deliver a predetermined dose of medication upon each actuation via an outlet valve member (e.g., a metering slide valve) at one end. The outlet valve member can be opened by pressing down the valve member while the canister is stationary, or by pressing down the canister while the valve member is stationary.

[0003] To ensure the proper functioning of the outlet valve components, a stem seal is essential on its outer periphery. However, as shown in Chinese Patent CN111432865 B, the stem seal is simply placed between the valve stem and the drying housing, lacking effective tensile strength. Furthermore, the frequent up-and-down movement of the valve stem during the use of the suction device causes the stem seal to gradually fail, thus affecting the lifespan of the device. Utility Model Content

[0004] The purpose of this invention is to provide a rod seal and a drying chamber. By optimizing the structure of the rod seal, its tensile strength is improved to meet long-term sealing requirements.

[0005] The objective of this utility model is achieved through the following technical solution: A rod seal, disposed on a valve stem, comprising: Sealing ring body; Tensile arms are respectively disposed on both sides of the sealing ring body and extend downward; The protrusions are circumferentially spaced on the upper end face of the sealing ring body, and an air passage groove is formed between adjacent protrusions.

[0006] In an alternative embodiment, the rod seal is made by dual injection molding of a thermoplastic material and a dry material.

[0007] In an alternative embodiment, the sealing ring body includes a sealing layer and a drying layer disposed on the surface of the sealing layer.

[0008] In an alternative embodiment, the sealing ring body has a V-shaped cross-section.

[0009] In an alternative embodiment, at least one of the two tensile arms extends beyond the lower end of the valve stem.

[0010] In an alternative embodiment, at least a portion of the surface of the tensile arm is provided with a drying layer.

[0011] A drying chamber comprising the rod seal described above.

[0012] In an alternative embodiment, the drying chamber further includes a drying shell, a tank fixing component, and a tank body; The valve stem extends into the tank body, the stem seal is disposed on the inner side of the drying shell, and the drying shell is connected to the tank body via a tank fixing member.

[0013] In an alternative embodiment, the tensile arm is embedded within the drying housing, and the bottom inner side of the drying housing is provided with a tensile groove for fixing the edge of the sealing ring body, and the protrusion abuts against the tank body.

[0014] In an alternative embodiment, the valve stem is provided with a side hole that can be selectively moved into or out of the drying chamber.

[0015] Compared with the prior art, the beneficial effects of this utility model include at least the following: 1. The rod seal has good tensile strength and can meet the long-term dynamic sealing requirements.

[0016] 2. While sealing, it also has a moisture-absorbing function, which can dry the valve stem channel within a certain range, limiting or basically eliminating the deposition or accumulation of drug preparations in the channel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rod seal of this utility model being assembled in the suction device.

[0018] Figure 2 This is a structural schematic diagram of the rod seal of this utility model.

[0019] Figure 3 yes Figure 2 A sectional view.

[0020] Figure 4 This is a schematic diagram of the drying chamber of this utility model. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0022] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0023] See Figures 1 to 4 As shown, this utility model provides a rod seal, which is disposed on a valve stem 35 and includes a sealing ring body 431, tensile arms 432, and protrusions 433. The tensile arms 432 are respectively disposed on both sides of the sealing ring body 431 and extend downwards until they are embedded into the drying housing 41. The protrusions 433 are circumferentially spaced on the upper end face of the sealing ring body 431, serving to contact the head of the tank body 31 and providing support. An air passage groove 434 is formed between adjacent protrusions 433 to maintain communication between the drying chamber 8 and the side hole 351. Additionally, a tensile groove 4123 for fixing the edge of the sealing ring body 431 is also provided on the inner bottom of the drying housing 41.

[0024] It is understandable that when the valve stem 35 is actuated and displaced, due to the tensile action of the tensile arm 432 and the tensile groove 4123, and the supporting action of the protrusion 433, the stem seal 43 can be effectively and stably kept in its original position, avoiding the valve stem 35 from displacing and causing it to loosen and fail, thus ensuring the effectiveness and reliability of the seal.

[0025] In some embodiments, the cross-section of the sealing ring body 431 is preferably V-shaped, which gives the sealing ring body 431 better axial extension performance and can better adapt to the displacement of the valve stem 35.

[0026] In some embodiments, the lengths of the tensile arms 432 on both sides of the sealing ring body 431 may be consistent or different, depending on the shape of the drying housing 41. Exemplarily, in this application, at least one of the two tensile arms 432 extends beyond the lower end of the valve stem 35, and at least a portion of the surface of the tensile arm 432 is provided with a drying layer 4312 for drying portions other than the drying chamber 8 area, i.e., for auxiliary drying of the connection area at the lower end of the valve stem 35, thereby reducing the possibility of moisture entering the valve stem 35.

[0027] In some embodiments, the stem seal 43 is made by double injection molding of a thermoplastic material (such as PP, TPE, etc.) and a drying material (such as a mineral desiccant), which makes it a moisture-absorbing seal that can seal the valve stem 35 while drying its surrounding area.

[0028] Specifically, the sealing ring body 431 includes a sealing layer 4311 and a drying layer 4312 that are joined together; wherein, the drying layer 4312 is located on the surface of the sealing layer 4311 and can be used to absorb moisture and dry the passage of the valve stem 35.

[0029] This utility model also discloses a drying chamber, including the aforementioned rod seal 43, a drying shell 41, a can fixing member 32, and a can body 31. The valve stem 35 extends into the can body 31, the rod seal 43 is disposed on the inner side of the drying shell 41, and the drying shell 41 is connected to the can body 31 via the can fixing member 32, thereby enclosing and forming the aforementioned drying chamber 8.

[0030] In some embodiments, the valve stem 35 is provided with a side hole 351, which can selectively move into or out of the drying chamber 8. When the side hole 351 moves into the drying chamber 8, the drying chamber 8 communicates with the channel of the valve stem 35 through the side hole 351, sealing the chamber and / or subjecting the channel of the valve stem 35 to moisture absorption and drying, thereby limiting or substantially eliminating the deposition or accumulation of pharmaceutical preparations within the channel. When the side hole 351 moves out of the drying chamber 8 (i.e., moves upwards), a dose of pharmaceutical preparation contained in the canister body 31 can enter the channel of the valve stem 35 through the side hole 351 and be delivered outwards.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A rod seal, disposed on a valve stem (35), characterized in that, include: Sealing ring body (431); Tensile arms (432) are respectively disposed on both sides of the sealing ring body (431) and extend downward; The protrusions (433) are circumferentially spaced on the upper surface of the sealing ring body (431), and an air groove (434) is formed between adjacent protrusions (433).

2. The rod seal according to claim 1, characterized in that, The rod seal is made of thermoplastic and dry material by double injection molding.

3. The rod seal according to claim 1, characterized in that, The sealing ring body (431) includes a sealing layer (4311) and a drying layer (4312) disposed on the surface of the sealing layer (4311).

4. The rod seal according to claim 1, characterized in that, The sealing ring body (431) has a V-shaped cross-section.

5. The rod seal according to claim 1, characterized in that, Of the two tensile arms (432), at least one extends beyond the lower end of the valve stem (35).

6. The rod seal according to claim 5, characterized in that, The tensile arm (432) has a drying layer (4312) on at least a portion of its surface.

7. A drying chamber, characterized in that, Includes the rod seal (43) as described in any one of claims 1-6.

8. The drying chamber according to claim 7, characterized in that, It also includes a drying shell (41), a tank fastener (32) and a tank body (31); The valve stem (35) extends into the tank body (31), the stem seal is disposed on the inner side of the drying housing (41), and the drying housing (41) is connected to the tank body (31) through the tank fixing member (32).

9. The drying chamber according to claim 8, characterized in that, The tensile arm (432) is embedded in the drying shell (41), and the bottom inner side of the drying shell (41) is provided with a tensile groove (4123) for fixing the edge of the sealing ring body (431), and the protrusion (433) abuts against the tank body (31).

10. The drying chamber according to claim 7, characterized in that, The valve stem (35) is provided with a side hole (351), which can be selectively moved into or out of the drying chamber (8).

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