Novel leakage-proof cover structure for steel drum
By adding an external annular sealing ring and a one-way flow valve to the outside of the inlet and outlet of the steel drum, the problems of sealing and residual liquid backflow of the steel drum were solved, thereby improving the sealing effect and cost-effectiveness.
Patent Information
- Application Number
- CN202520592708.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-31
AI Technical Summary
The existing leak-proof cap structure of steel drums is difficult to effectively prevent residual liquid from flowing back while maintaining a good sealing effect, and the cost of replacing the mold is high.
An external annular sealing ring is added to the outer wall of the inlet and outlet of the steel drum. The ring is higher than the end face of the outer wall of the inlet and outlet and extends radially to the outer circumference of the drum plug to abut against the outer ring. It works in conjunction with a one-way flow valve to regulate the air pressure, thereby achieving sealing and residual liquid return.
It effectively prevents residual liquid backflow, reduces liquid loss, lowers production costs, and the lid can still be used as a universal component without the need to change the mold.
Smart Images
Figure CN223836187U_ABST
Abstract
Description
[Technical Field]
[0001] This utility model relates to the field of steel drum accessories, and in particular to a leak-proof cover structure for steel drums at the inlet and outlet of liquid. [Background Technology]
[0002] Steel drums are a common type of fluid storage container, mainly used to store oil or some chemical liquids. Their main structure includes a drum body and a lid on the drum body. The lid has inlet and outlet ports, which are both inlet and outlet ports. After oil or liquid is injected into the drum body, the inlet and outlet ports are sealed with a drum stopper to facilitate storage and transportation.
[0003] Traditional leak-proof cover structures, such as Figure 1 As shown, a top sealing ring 20 is set on the upper edge of the barrel stopper, and no sealing ring is set at the inlet and outlet positions. When sealing, the barrel stopper is tightened onto the inlet and outlet until the end of the outer wall 10 of the inlet and outlet abuts against the top sealing ring 20, thereby forming a seal. [Utility Model Content]
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a new leak-proof cover structure for steel drums, which can not only ensure the sealing effect, but also realize the backflow of residual liquid at the inlet and outlet to a certain extent.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A novel leak-proof cap structure for steel drums is disclosed, for installation on the inlet / outlet of the steel drum lid. The leak-proof cap structure includes a drum stopper, the drum stopper including a base plate, the top outer ring of the base plate being surrounded by an outer peripheral sidewall, the outer peripheral sidewall being provided with a threaded connection portion for connecting with the inner sidewall of the inlet / outlet, the leak-proof cap structure further including an elastic external annular sealing ring, the external annular sealing ring being wrapped around the outer sidewall of the inlet / outlet and interference-fitted with the outer sidewall of the inlet / outlet, the height of the external annular sealing ring being higher than the end face of the outer sidewall of the inlet / outlet, the outer peripheral sidewall of the drum stopper extending radially outward to form an abutting outer ring, the top surface of the external annular sealing ring abutting and sealing with the abutting outer ring.
[0007] The beneficial effects of using this utility model are as follows:
[0008] In this invention, an external annular sealing ring is added. This external annular sealing ring completely covers the outer wall of the inlet and outlet, and the height of the external annular sealing ring is higher than the end face of the outer wall of the inlet and outlet. This forms a liquid-blocking ring on the upper outer side of the inlet and outlet. In particular, residual liquid flowing out of the inlet and outlet can be blocked by this liquid-blocking ring and flow back into the tank, reducing liquid loss and waste.
[0009] To match the external annular sealing ring, the outer peripheral sidewall of the barrel stopper in this invention has an abutting outer ring extending radially outward. The top surface of the external annular sealing ring abuts and seals with the abutting outer ring, thereby achieving a seal on the barrel. In this design, the external annular sealing ring not only achieves a sealing function but also serves as an additional liquid-retaining ring, facilitating the backflow of residual liquid.
[0010] Furthermore, the structure of this utility model does not require any changes to the structure of the bucket lid and the inlet / outlet, because an external annular sealing ring is added to the outer wall of the inlet / outlet. Therefore, the bucket lid can still be used as a universal component without modification, reducing the cost for manufacturers to modify the mold.
[0011] Preferably, the top of the outer wall of the inlet / outlet is provided with an outwardly protruding ring, and when the external annular sealing ring is interference-fitted onto the outer wall of the inlet / outlet, the external annular sealing ring is in the shape of a trumpet.
[0012] Preferably, the height difference between the external annular sealing ring and the outer wall end face of the inlet / outlet is H, wherein H satisfies 2mm to 5mm.
[0013] Preferably, the outer abutting ring extends downwards with a lower flange ring, and the top of the external annular sealing ring is surrounded within the lower flange ring.
[0014] Preferably, the bottom plate is provided with a pressure regulating component for connecting the inside of the steel drum with the outside. The pressure regulating component is a one-way flow valve, which allows air from outside the drum to flow into the drum in one direction.
[0015] Preferably, the opening pressure of the one-way flow valve is configured to be 0.1 to 0.13 MPa.
[0016] Preferably, the one-way flow valve includes a valve body, the valve body having a hollow valve cavity, and the valve cavity having a valve stem and a return spring for resetting the valve stem.
[0017] Preferably, the valve body is provided with external threads, and a first nut and a second nut are provided on the external threads, and the base plate is clamped between the first nut and the second nut.
[0018] Preferably, a first sealing ring is provided between the one-way flow valve and the base plate, and the first sealing ring is located between the first nut and the base plate; and / or, a second sealing ring is provided between the one-way flow valve and the base plate, and the second sealing ring is located between the second nut and the base plate.
[0019] Preferably, the base plate is provided with a positioning part for matching tightening tools, and the air pressure regulating component is located in the middle position on the side of the positioning part.
[0020] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]
[0021] The present invention will be further described below with reference to the accompanying drawings:
[0022] Figure 1 A schematic diagram of the leak-proof cover structure for the inlet and outlet of a traditional steel drum;
[0023] Figure 2 This is a schematic diagram of the assembly of the liquid inlet and outlet of the bucket lid according to Embodiment 1 of this utility model;
[0024] Figure 3 This is a schematic diagram of the barrel stopper in Embodiment 1 of this utility model;
[0025] Figure 4 This is a cross-sectional view of the present invention assembled onto the bucket lid according to an embodiment;
[0026] Figure 5 This is a top view of the barrel stopper in Embodiment 1 of this utility model.
Detailed Implementation Methods
[0027] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.
[0028] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are used only for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0030] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0031] Example 1:
[0032] like Figures 2 to 5 The diagram illustrates a leak-proof cover structure for the inlet and outlet of a steel drum lid, used for installation on the inlet and outlet of the steel drum lid 1. In this embodiment, the leak-proof cover structure generally includes a drum plug 2 and an independent external annular sealing ring 3. The drum plug 2 includes a base plate 21, with an outer peripheral sidewall surrounding the top of the base plate 21. The outer peripheral sidewall has a threaded connection for connecting to the inner sidewall of the inlet and outlet. The inner sidewall of the inlet and outlet has corresponding internal threads. The external annular sealing ring 3 is an elastic element, wrapped around the outer sidewall 10 of the inlet and outlet and interference-fitted with it. In this embodiment, the external annular sealing ring 3 completely wraps around the outer sidewall 10 of the inlet and outlet. (See also...) Figure 4 After installation, the height of the external annular sealing ring 3 is higher than the end face of the outer wall 10 of the inlet / outlet. The outer peripheral wall of the barrel plug 2 extends radially outward with an abutting outer ring 22. The top surface of the external annular sealing ring 3 abuts and seals with the abutting outer ring 22. A schematic diagram of the abutment can be found in the provided image. Figure 4 As shown in the image.
[0033] In this embodiment, an external annular sealing ring 3 is added. The external annular sealing ring 3 completely covers the outer wall 10 of the inlet and outlet, and the height of the external annular sealing ring 3 is higher than the end face of the outer wall 10 of the inlet and outlet. This forms a liquid-blocking ring on the upper outer side of the inlet and outlet. In particular, the residual liquid flowing out of the inlet and outlet can be blocked by this liquid-blocking ring and flow back into the tank, reducing liquid loss and waste.
[0034] In this embodiment, the external annular sealing ring 3 serves both as a sealing function and as an additional liquid-blocking ring, which helps with the return of residual liquid.
[0035] In addition, the structure of this embodiment does not require any changes to the structure of the lid 1 and the inlet / outlet, because an external annular sealing ring 3 is added to the outer wall 10 of the inlet / outlet. Therefore, the lid 1 can still be used as a universal component without any changes, reducing the cost for manufacturers to modify the mold.
[0036] like Figure 4 As shown, the outer wall of the inlet / outlet is usually provided with a protruding ring at the top. In this embodiment, when the external annular sealing ring 3 is interference-fitted onto the outer wall 10 of the inlet / outlet, the external annular sealing ring 3 is in the shape of a flared mouth. This flared mouth shape facilitates the pouring of liquid, and the flared mouth shape also makes the contact with the outer ring 22 better.
[0037] like Figure 4 As shown, the height difference between the external annular sealing ring 3 and the end face of the outer wall 10 of the inlet / outlet is H, where H is between 2mm and 5mm. Generally, 3mm or 4mm is preferred. A large height difference will make it inconvenient to assemble the plug 2 to the inlet / outlet, requiring many turns of tightening, or it will increase the height of the plug 2 accordingly. Furthermore, it will cause excessive deformation of the external annular sealing ring 3, making it difficult to control the sealing performance. A small height difference will result in poor reflux.
[0038] To protect the external annular sealing ring 3, in this embodiment, the outer abutment ring 22 extends downwards with a downward-facing flange ring 23, and the top of the external annular sealing ring 3 is surrounded within the downward-facing flange ring 23. This design reduces the likelihood of external impacts damaging the top of the external annular sealing ring 3, thus decreasing the possibility of seal failure.
[0039] Furthermore, during long-term daily work and production, certain problems were found with these steel drums when storing high-temperature liquids. Many oils or liquids are typically at a certain temperature when poured into the drums, some reaching 70°C-85°C. After these oils are poured into the drums, workers immediately tighten the stopper. Over time or after transportation, the drums were found to have varying degrees of flattening or concavity, especially those with substandard wall thickness, where this phenomenon was particularly severe.
[0040] Initially, it was thought that the flattening or denting was caused by impact. However, after long-term research, it was found that some barrels that were stored naturally without being transported also experienced flattening or denting. After analysis, it was found that this problem was caused by the high temperature of the oily liquid initially poured in. If the stopper 2 was tightened directly after pouring without cooling, the internal pressure of the barrel would decrease after the oily liquid cooled down, creating a negative pressure. This created a pressure difference between the inside and outside of the barrel. In particular, some barrels with insufficient wall thickness would flatten or dent under atmospheric pressure.
[0041] To solve the above problems, such as Figure 3 As shown, in this embodiment, the bottom plate 21 is provided with an air pressure regulating component 4 for connecting the inside of the steel drum with the outside. The air pressure regulating component 4 is a one-way flow valve, which allows air from outside the drum to flow into the drum in one direction.
[0042] After long-term testing, the opening pressure of the one-way flow valve was configured to be 0.1 to 0.13 MPa. Too low an opening pressure will cause the air pressure regulating component 4 to be opened or closed frequently, affecting the storage effect of the oil in the tank. Too high an opening pressure will cause the tank to have concave deformation before the one-way flow valve is opened. Setting it to 0.1 to 0.13 MPa is considered to be more suitable, and 0.12 MPa is usually preferred.
[0043] Regarding the structure of the one-way flow valve, it specifically includes a valve body, which has a hollow valve cavity. The valve cavity contains a valve stem 40 and a return spring (not shown in the figure) for resetting the valve stem 40. In this way, different opening pressures of the one-way flow valve can be set by using different specifications of the return spring.
[0044] To facilitate the installation of the valve body on the base plate 21, the valve body is provided with external threads. The external threads are provided with a first nut 41 and a second nut 42, wherein the first nut 41 is above the base plate 21 and the second nut 42 is below the base plate 21. By tightening the two nuts together, the base plate 21 is clamped between the first nut 41 and the second nut 42, thereby realizing the installation of the valve body on the base plate 21.
[0045] To ensure a more stable installation of the valve body, a metal washer 43 is provided on the outside of the valve body. The metal washer 43 is located between the base plate 21 and the first nut 41. Alternatively, the metal washer 43 can also be located between the base plate 21 and the second nut 42, or both between the base plate 21 and the first nut 41 and between the base plate 21 and the second nut 42.
[0046] To enhance the sealing effect between the one-way valve and the base plate 21, a first sealing ring is provided between the one-way valve and the base plate 21. The first sealing ring is located between the first nut 41 and the base plate 21.
[0047] Similarly, a second sealing ring 44 can also be provided between the one-way valve and the base plate 21, with the second sealing ring 44 located between the second nut 42 and the base plate 21. It is readily apparent that those skilled in the art can simultaneously provide a first sealing ring and a second sealing ring 44 on the one-way valve. Taking this embodiment as an example, the second sealing ring 44 is only provided between the one-way valve and the base plate 21.
[0048] In this embodiment, the base plate 21 is provided with a positioning part 5 for matching tightening tools, and the position of the air pressure regulating component 4 is as follows: Figure 5 As shown, it is positioned in the middle of the side of the positioning part 5. This position maximizes the use of the space on the side of the positioning part 5 for installing the air pressure regulating component 4, while also having minimal impact on the positioning of the tightening tool on the positioning part 5, thus not affecting operation.
[0049] like Figure 4 or Figure 5 As shown, the positioning part 5 in this embodiment specifically includes an intermediate connecting plate 51 and raised lugs 52 located on both sides of the intermediate connecting plate 51. Each raised lug 52 includes an outer connecting piece 521 connected to the intermediate connecting plate 51 and an inner connecting piece 522 extending downwards. The intermediate connecting plate 51 has perforated holes on both sides. The inner connecting piece 522 extends downwards and passes through the perforated holes before finally being fixedly connected to the base plate 21. This structure of the positioning part 5 means that both the intermediate connecting plate 51 and the raised lugs 52 have corresponding connection points to the base plate 21, which improves the stability of the connection between the positioning part 5 and the base plate 21.
[0050] like Figure 4 As shown, in this embodiment, the height of the raised lug 52 is lower than the height of the outer peripheral sidewall of the stopper 2. This design aims to better protect the raised lug 52 from being touched by external forces, especially lateral forces, thus reducing the likelihood of the stopper 2 being loosened.
[0051] Example 2:
[0052] The difference between this embodiment and Embodiment 1 is that no air pressure regulating component is provided on the barrel stopper.
[0053] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.
Claims
1. A novel leak-proof cap structure for steel drums, used for installation on the inlet / outlet of the steel drum cap, the leak-proof cap structure comprising a drum stopper, the drum stopper comprising a base plate, the top outer ring of the base plate being surrounded by an outer peripheral sidewall, the outer peripheral sidewall being provided with a threaded connection portion for connection with the inner sidewall of the inlet / outlet, characterized in that, The leak-proof cover structure also includes an elastic external annular sealing ring. The external annular sealing ring is wrapped around the outer wall of the inlet and outlet and is press-fitted with the outer wall of the inlet and outlet. The height of the external annular sealing ring is higher than the end face of the outer wall of the inlet and outlet. The outer peripheral side wall of the barrel plug extends radially outward with an abutting outer ring. The top surface of the external annular sealing ring abuts and seals with the abutting outer ring.
2. The novel leak-proof cap structure for steel drums as described in claim 1, characterized in that: The outer wall of the inlet and outlet is provided with an outward protruding ring. When the external annular sealing ring is interference-fitted onto the outer wall of the inlet and outlet, the external annular sealing ring is in the shape of a trumpet.
3. The novel leak-proof cap structure for steel drums as described in claim 1, characterized in that: The height difference between the external annular sealing ring and the outer wall end face of the inlet / outlet is H, where H is 2mm to 5mm.
4. The novel leak-proof cap structure for steel drums as described in claim 1, characterized in that: The outer abutting ring extends downwards with a lower flange ring, and the top of the external annular sealing ring is surrounded within the lower flange ring.
5. A novel leak-proof cap structure for steel drums as described in claim 1, characterized in that: The bottom plate is equipped with a pressure regulating component for connecting the inside of the steel drum with the outside. The pressure regulating component is a one-way flow valve, which allows air from outside the drum to flow into the drum in one direction.
6. A novel leak-proof cap structure for steel drums as described in claim 5, characterized in that: The opening pressure of the one-way flow valve is configured to be 0.1 to 0.13 MPa.
7. A novel leak-proof cap structure for steel drums as described in claim 5, characterized in that: The one-way flow valve includes a valve body, a hollow valve cavity inside the valve body, a valve stem and a return spring for resetting the valve stem inside the valve cavity.
8. A novel leak-proof cap structure for steel drums as described in claim 7, characterized in that: The valve body is provided with external threads, and a first nut and a second nut are provided on the external threads. The base plate is clamped between the first nut and the second nut.
9. A novel leak-proof cap structure for steel drums as described in claim 8, characterized in that: A first sealing ring is provided between the one-way flow valve and the base plate, and the first sealing ring is located between the first nut and the base plate; and / or, a second sealing ring is provided between the one-way flow valve and the base plate, and the second sealing ring is located between the second nut and the base plate.
10. A novel leak-proof cap structure for steel drums as described in claim 5, characterized in that: The base plate is provided with a positioning part for matching tightening tools, and the air pressure regulating component is located in the middle position on the side of the positioning part.