Low-temperature test device of rubber sealing ring for portable fire extinguisher
By improving the low-temperature testing device, the rubber sealing ring is automatically fitted onto the steel mandrel in a low-temperature environment, solving the problems of inflexible operation and frostbite risk in the existing technology, and realizing a safe and economical rubber sealing ring testing operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2026-03-24
AI Technical Summary
The low-temperature testing of rubber sealing rings in existing portable fire extinguishers is not flexible enough, poses a risk of frostbite, and is costly, making it difficult to meet safety and economic requirements.
Design an improved low-temperature testing device by modifying the low-temperature chamber into two parts: the upper chamber has a through hole and the lower chamber has a stepped groove. Through the guide spring and the stepped groove structure, the rubber sealing ring is automatically fitted onto the steel mandrel in the low-temperature environment, and the operator is kept away from the low-temperature environment.
It achieves a safe and convenient installation of rubber sealing rings, avoids the risk of frostbite, reduces operating costs, and meets the requirements of safety and economy.
Smart Images
Figure CN224034923U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laboratory instruments and equipment, specifically to a low-temperature testing device for a rubber sealing ring used in a portable fire extinguisher. Background Technology
[0002] Portable fire extinguishers are common firefighting equipment, including carbon dioxide fire extinguishers with a total mass not exceeding 23 kg and other types of fire extinguishers with a total mass not exceeding 20 kg. They are mainly suitable for extinguishing initial fires involving flammable and combustible liquids, gases, and energized equipment. To ensure that portable fire extinguishers can extinguish fires smoothly during operation, it is necessary to regularly inspect and test each component of the fire extinguisher. The rubber sealing ring is an important component of a portable fire extinguisher, and its performance determines whether the valve can function properly. The national standard specifies that five rubber sealing rings are placed in a low-temperature chamber at (-40±2)℃ for 24 hours, and then removed and fitted onto a steel mandrel with an inner diameter 1.2 times that of the sealing ring, for visual inspection. In the current technology, this test is usually performed manually by wearing gloves to remove the rubber sealing rings from the low-temperature chamber and then fitting them onto the steel mandrel. This operation is not flexible enough, and there is a risk of frostbite if not handled carefully. Although a robotic arm can replace manual labor, it is more expensive and less practical. Utility Model Content
[0003] To address the aforementioned technical problems, this utility model discloses a low-temperature testing device for rubber sealing rings used in portable fire extinguishers. This device can safely mount the low-temperature treated rubber sealing ring onto a steel core rod. It is easy to operate and effectively protects the operator from frostbite.
[0004] A low-temperature testing device for a rubber sealing ring used in a portable fire extinguisher includes a low-temperature chamber. The surface of the low-temperature chamber is provided with stepped grooves whose diameter decreases sequentially from the outside to the inside. The diameter of the larger groove in the stepped groove is larger than the outer diameter of the rubber sealing ring, and the diameter of the smaller groove in the stepped groove is smaller than the outer diameter of the rubber sealing ring but larger than the outer diameter of the steel core rod.
[0005] Preferably, a guide spring is provided inside the large groove, and the inner diameter of the guide spring is slightly larger than the outer diameter of the rubber sealing ring.
[0006] Preferably, the depth of the groove is greater than the height of the five rubber sealing rings.
[0007] Preferably, the low-temperature test chamber includes an upper chamber and a lower chamber connected to each other. The upper chamber is provided with a through hole for a steel mandrel to pass through, and the lower chamber is provided with a stepped groove.
[0008] Preferably, the inner diameter of the through hole is slightly larger than the outer diameter of the rubber sealing ring.
[0009] Preferably, the exterior of the upper box and the exterior of the lower box are both covered with an insulation layer.
[0010] Preferably, a cooling pipe is provided inside the lower housing.
[0011] Beneficial effects
[0012] This invention modifies the existing low-temperature chamber into two parts, with a through hole in the upper chamber and a stepped groove in the lower chamber. The rubber sealing ring is placed in the stepped groove, and a steel mandrel is inserted into the stepped groove to easily fit the low-temperature treated rubber sealing ring onto the steel mandrel. The operator stays away from the low-temperature environment throughout the process, effectively preventing frostbite on the hands. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 A schematic diagram illustrating the process of fitting a rubber sealing ring onto a steel mandrel;
[0016] Figure 3 for Figure 2 A magnified view of part A in the image;
[0017] In the diagram: 1. Lower housing, 2. Refrigeration pipe, 3. Insulation layer, 4. Screw, 5. Upper housing, 6. Steel mandrel, 7. Rubber sealing ring fitted onto the mandrel, 8. Guide spring, 9. Rubber sealing ring before fitting. Detailed Implementation
[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0019] In the description of this utility model, it should be understood that the terms "inner", "outer", "left", and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0020] This utility model discloses a method such as Figure 1-3 The illustrated low-temperature testing device for rubber sealing rings in portable fire extinguishers modifies an existing low-temperature chamber into two parts. The upper chamber 5 has a convex-shaped structure with a through-hole at the bottom, the inner diameter of which is slightly larger than the outer diameter of the rubber sealing ring 7 after it is fitted onto the mandrel. The lower chamber 1 has a concave-shaped structure with stepped grooves and a sealing boundary on the upper surface. A cooling pipe 2 is installed inside the lower chamber 1 to ensure a low-temperature environment for the rubber sealing ring. To maintain a stable temperature, an insulation layer 3 is applied to both the upper chamber 5 and the lower chamber 1. A temperature indicator and a timer are installed in the lower chamber 1 to achieve the standard requirement of "keeping the rubber sealing ring at a low temperature of (-40±2)℃ for 24 hours". The convex and concave structures of the two chambers fit together and are connected as a whole by screws 4 on their sides. The insulation layer 3 is detachably applied to the screws and the exterior of both the upper and lower chambers.
[0021] The inner diameter of the stepped groove gradually decreases from top to bottom. A guide spring 8 is installed in the larger groove to stabilize and guide the rubber sealing ring as it is fitted onto the steel mandrel 6. The inner diameter of the guide spring 8 is slightly larger than the outer diameter of the rubber sealing ring 7 after it is fitted onto the mandrel. The smaller groove has a larger diameter than the outer diameter of the rubber sealing ring 9 before it is fitted. The smaller groove has a larger diameter than the outer diameter of the steel mandrel 6 but smaller than the outer diameter of the rubber sealing ring 9 before it is fitted. This design ensures that the steel mandrel 8 can smoothly pass through the through hole and the larger groove, inserting into the smaller groove, and fitting the rubber sealing ring onto its outside during the process. The operator remains away from the low-temperature environment throughout the process, effectively preventing frostbite.
[0022] To ensure that all the rubber seals in the large groove can be fitted onto the steel mandrel 8, the depth of the small groove needs to be set to be greater than the height of five rubber seals.
[0023] To facilitate operation, the upper end of the steel mandrel 6 is designed with a handle. The handle can be threaded, riveted, or pinned.
[0024] The small groove is a certain distance from the bottom of the lower chamber 1. The lower chamber part within this distance is distributed with refrigeration pipes 2, and refrigeration pipes 2 are also distributed around the stepped groove. This arrangement can effectively ensure that the rubber sealing ring is in a constant low temperature environment.
[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A low-temperature testing device for a rubber sealing ring used in a portable fire extinguisher, characterized in that, The low-temperature box is provided with stepped grooves with diameters decreasing from outside to inside on the surface of the low-temperature box, the diameter of the large groove is larger than the outer diameter of the rubber sealing ring, and the diameter of the small groove is smaller than the outer diameter of the rubber sealing ring but larger than the outer diameter of the steel mandrel.
2. The low temperature test device for a rubber seal ring of a portable fire extinguisher according to claim 1, characterized in that, A guide spring is arranged in the large groove, and the inner diameter of the guide spring is slightly larger than the outer diameter of the rubber sealing ring.
3. The low temperature test device for a rubber seal ring of a portable fire extinguisher according to claim 1, characterized in that, The depth of the small groove is greater than the height of five rubber sealing rings.
4. The low temperature test device for a rubber seal ring of a portable fire extinguisher according to claim 1, characterized in that, The low-temperature box comprises an upper box body and a lower box body connected with each other, the upper box body is provided with a through hole through which the steel mandrel passes, and the lower box body is provided with the stepped grooves.
5. The low temperature test device for a rubber seal ring of a portable fire extinguisher according to claim 4, characterized in that, The inner diameter of the through hole is slightly larger than the outer diameter of the rubber sealing ring.
6. The low temperature testing device for rubber sealing rings of a portable fire extinguisher according to claim 4, wherein The outer part of the upper box body and the outer part of the lower box body are jointly covered with a heat preservation layer.
7. The low temperature testing device for rubber sealing rings of a portable fire extinguisher according to claim 4, characterized in that, The lower box body is provided with a refrigeration pipe.