Early warning nut device

Abstract

The utility model discloses an early warning nut device which comprises a nut shell and a sealing element, one end of the sealing element is provided with a sealing cover, the nut shell is provided with a limiting step, the lower side of the sealing cover is concaved in an inclined mode in the direction opposite to airflow to form a first limiting portion, and the lower side of the limiting step is provided with a second limiting portion. The first limiting part and the second limiting part are matched for limiting, and a reinforcing rib structure is arranged on the outer side of the limiting step. The lower side of the sealing cover is obliquely sunken in the direction opposite to airflow to form the first limiting part, the first limiting part and the second limiting part formed on the lower side of the limiting step are used for limiting, stress at the joint of the sealing element and the nut shell is concentrated to the sunken point of the first limiting part and the protruding point of the second limiting part, the sealing performance is improved, and the service life of the nut is prolonged. And a reinforcing rib structure is arranged on the outer side of the limiting step, so that the stress of the joint of the first limiting part and the second limiting part is reduced, and the compression-resistant use performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing detection equipment, in particular to an early warning nut device. Background Art

[0002] The main functions of the warning nut include sealing of closed containers, early warning of pressure in the system, residual pressure detection, etc. At present, the end of the connecting pipe of the evaporator component is generally equipped with a warning nut. When the air conditioner helium pressure is detected, after the refrigerant is injected from the connecting pipe of the air conditioner, the end of the connecting pipe is blocked by the warning nut to prevent helium from leaking through the end of the connecting pipe, which plays a sealing role and also has an early warning effect on the air tightness inspection of the air conditioner.

[0003] In actual production and manufacturing, the main problems with warning nuts are insufficient sealing reliability and insufficient compressive durability, which affect the detection of sealing test equipment, the judgment of sealing test results and abnormal leakage of heat exchange media, and lead to quality problems such as product performance, long-term product reliability, and after-sales complaints, increase the cost of rework, second-line inspection and secondary rework quality risks, and affect the user experience.

[0004] Secondly, the warning nut housing in the prior art is an opaque structure, and the visual inspection of the warning ejector pin display and the structural state of the sealing element is poor.

[0005] In addition, the gap between the original early warning cap nut sealing rubber element and the outer shell is a closed space structure, and there is a problem of gas residue in the closed space causing abnormal triggering of the early warning needle. Utility Model Content

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a warning nut device to improve the sealing performance and compressive durability of the warning nut.

[0007] The technical solution adopted by the utility model to solve its technical problems is: an early warning nut device, including a nut shell and a sealing element, a sealing cover is provided at one end of the sealing element, the nut shell is provided with a limiting step, the lower side of the sealing cover is inclined and recessed in the opposite direction of the airflow to form a first limiting portion, the lower side of the limiting step is provided with a second limiting portion, the first limiting portion and the second limiting portion cooperate to limit, and a reinforcing rib structure is provided on the outer side of the limiting step.

[0008] Compared with the traditional warning nut structure, in which the horizontal plane between the sealing cover of the sealing element and the limiting step of the nut shell is subjected to average force and pressure, the utility model improves the sealing connection between the nut shell and the sealing element.

[0009] Specifically, the lower side of the sealing cover on the sealing element is inclined and recessed to form a first limiting portion, and the first limiting portion is set at an angle to the airflow direction, and a second limiting portion is correspondingly set at the connection between the limiting step and the sealing element. The first limiting portion formed by the inclined recess has a force point formed at the recess, and correspondingly, the second limiting portion is also formed with a protrusion that cooperates with the recess of the first limiting portion, so that the force at the junction of the sealing element and the nut shell is concentrated on the recess point of the first limiting portion and the protrusion point of the second limiting portion, thereby forming a sealing method with concentrated force points inclined downward, thereby improving the sealing performance, and at the same time, a reinforcing rib structure is added to the limiting step connecting the nut shell and the sealing element to improve the pressure bearing capacity of the device.

[0010] As a further improvement of the present utility model: the first limiting portion consists of a first limiting area, a first extension area and a first transition area, the first extension area is inclined from the first transition area to the first limiting area, and the first limiting area is lower than the first transition area.

[0011] Furthermore, the first limiting area has a curved depression, and the curved depression serves as a concentrated force point of the sealing cover.

[0012] As a further improvement of the present utility model: the second limiting portion is composed of a second limiting area, a second extension area and a second transition area, the second extension area is inclined from the second transition area to the second limiting area, the second limiting area is lower than the second transition area, and the first limiting area is connected to the second limiting area.

[0013] Furthermore, the second limiting area has a curved protrusion that matches the curved depression of the first limiting area, and the curved protrusion serves as a concentrated force point of the limiting step.

[0014] The arc depression in the first limiting area is limitedly connected with the arc protrusion in the second limiting area, and sealing is achieved by concentrating the force points, thereby improving the overall sealing performance of the early warning nut device.

[0015] Furthermore, the first transition zone is provided with a curvature structure, and correspondingly the second transition zone has a curvature structure.

[0016] The first extension zone transitions from the first transition zone arc to the arc depression of the first limiting zone. Similarly, the second extension zone extends from the second transition zone arc to the arc depression of the second limiting zone. Since the first transition zone is higher than the first limiting zone and the second transition zone is higher than the second limiting zone, the combination of the two arc structures makes the limiting step fit tightly with the sealing cover, and the concentrated force point sealing is achieved through the arc depression and the arc protrusion, thereby further improving the sealing performance.

[0017] As a further improvement of the utility model: a sealing cover is provided at the top end of the nut housing, and a pressure relief hole is opened on the sealing cover.

[0018] The pressure relief hole can be opened on the outer peripheral side wall of the sealing cover, and the sealing cover is arranged at the top of the nut housing. The first limit part and the second limit part formed by the inclined depression improve the sealing performance of the device, and the pressure relief hole is used to release residual gas to avoid abnormal triggering of the warning ejector pin.

[0019] As a further improvement of the present invention: the nut housing is made of PC material.

[0020] As a further improvement of the utility model: the other end of the sealing element is connected to a warning ejector pin, and the warning ejector pin and the sealing cover are an integrated structure.

[0021] As a further improvement of the present invention: a fastening step is connected to the lower end of the nut housing relative to the limiting step, the connection between the limiting step and the fastening step forms the second limiting portion, and the lower side of the sealing cover is embedded in the fastening step.

[0022] As a further improvement of the utility model: a first cavity is provided at the top end of the nut shell, and the warning ejector pin is slidably disposed in the first cavity.

[0023] The interior of the sealing cover is a hollow structure, forming the first cavity, and the pressure relief hole is connected to the first cavity.

[0024] As a further improvement of the utility model: the sealing cover is provided with a connecting portion and a sealing step, one side of the connecting portion is connected to the warning ejector pin, the other side of the connecting portion forms an elastic protrusion, and the sealing step and the connecting portion are connected to form an air pressure space.

[0025] The air pressure space is a sealed space, which is connected to the connector. Gas fills the air pressure space and squeezes the first limiting portion of the sealing cover, so that the first limiting portion is tightly combined with the second limiting portion to ensure the sealing performance.

[0026] The outer surface of the sealing step is inclined and recessed to form the first limiting portion. The sealing step, the connecting portion and the warning ejector pin are an integrated structure. Preferably, the sealing step, the connecting portion and the warning ejector pin are injection molded as a whole.

[0027] As a further improvement of the present invention: the outer peripheral side surface of the connecting portion forms an inclined surface, and the inclined surface and the inner wall of the limiting step have an included angle.

[0028] As a further improvement of the utility model: a pressing cover is provided inside the sealing step, an air flow hole is opened in the middle of the pressing cover, and the air flow hole is communicated with the air pressure space.

[0029] As a further improvement of the utility model: a second cavity is formed between the outer periphery of the connecting portion and the limiting step.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] The utility model tilts and recesses the lower side of the sealing cover of the sealing element in the opposite direction of the airflow to form a first limiting portion, and provides a second limiting portion on the lower side of the limiting step of the nut shell, so that the first limiting portion and the second limiting portion are limitedly matched, and the force at the junction of the sealing element and the nut shell is concentrated on the connection point of the first limiting portion and the second limiting portion, forming a sealing mode of the first limiting portion and the second limiting portion tilting downward to concentrate the force points, thereby improving the sealing performance of the early warning nut device, and further adding a reinforcing rib structure on the outer side of the limiting step to reduce the force at the connection between the first limiting portion and the second limiting portion, thereby improving the pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The utility model is a structural schematic diagram of an early warning nut device.

[0033] Figure 2 The utility model is a schematic diagram of the nut housing structure of an early warning nut device.

[0034] Figure 3 The utility model is a schematic diagram of the sealing element structure of an early warning nut device.

[0035] Reference numerals:

[0036] 1. nut housing, 11. limiting step, 111. second limiting portion, 1111. second limiting area, 1112. second extension area, 1113. second transition area, 12. sealing cover, 121. pressure relief hole, 13. fastening step, 14. installation step;

[0037] 2. Sealing element, 21. Sealing cover, 211. First limiting portion, 2111. First limiting area, 2112. First extension area, 2113. First transition area, 212. Sealing step, 213. Connecting portion, 22. Warning ejector pin;

[0038] 3. Strengthen the rib structure;

[0039] 4. Compression cover, 41. First compression part, 42. Second compression part, 401. Air flow hole. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In order to solve the technical problems of insufficient sealing performance and pressure resistance of the warning nut and poor durability in the prior art, the utility model is further described in combination with the accompanying drawings and embodiments:

[0043] like Figure 1-Figure 3 As shown, the utility model discloses an early warning nut device, including a nut shell 1 and a sealing element 2, including a nut shell 1 and a sealing element 2, one end of the sealing element 2 is provided with a sealing cover 21, the nut shell 1 is provided with a limiting step 11, the lower side of the sealing cover 21 is inclined and recessed in the opposite direction of the airflow to form a first limiting portion 211, the lower side of the limiting step 11 is provided with a second limiting portion 111, the first limiting portion 211 cooperates with the second limiting portion 111 to limit, and a reinforcing rib structure 3 is provided on the outer side of the limiting step 11.

[0044] In the traditional early warning nut structure, the horizontal plane between the sealing cover 21 of the sealing element 2 and the limiting step 11 of the nut shell 1 is subjected to an average force and pressure-bearing mode. Under high impact force, this pressure-bearing mode causes increased stress concentration at the limiting step 11 of the nut shell 1, resulting in deformation or even cracking. The limiting combination of the sealing element 2 and the nut shell 1 is not tight, resulting in gas leakage. The utility model improves the connection structure and pressure-bearing mode between the sealing cover 21 of the sealing element 2 and the limiting step 11 of the nut shell 1, ensures that the connection between the sealing cover 21 and the limiting step 11 is tight, and improves the overall sealing performance and pressure-bearing capacity of the device.

[0045] Specifically, the nut housing 1 is a hollow structure, and the sealing element 2 and the connector are located inside the nut housing 1. The airflow enters from the connector to extrude the sealing element 2. The sealing element 2 and the connector form a sealed space to prevent gas leakage. The utility model is based on the limiting fastening of the limiting step 11 of the nut housing 1 and the sealing cover 21 of the sealing element 2. The lower surface of the sealing cover 21 is tilted and recessed in the opposite direction of the airflow to form a first limiting portion 211. The first limiting portion 211 is tilted and recessed, and its lowest end forms a recess, which becomes the concentrated force point of the sealing cover 21. A recessed point can also be formed. Whether a recessed portion or a recessed point is formed, it does not affect the implementation of the utility model. Accordingly, a second limiting portion 111 is provided at the connection between the limiting step 11 and the sealing cover 21. The second limiting portion 111 is provided at the connection between the limiting step 11 and the sealing cover 21. The limiting portion 111 and the first limiting portion 211 cooperate with each other to form a protrusion at their lowest point, which becomes the concentrated force point of the limiting step 11, and can also form a protrusion. Whether it is a protrusion or a protrusion, it does not affect the implementation of the utility model. After the first limiting portion 211 is connected to the second limiting portion 111, the recessed point and the protrusion are combined to limit, forming a sealing method of a concentrated force point inclined downward. Therefore, the first limiting portion 211 and the second limiting portion 111 make the nut housing 1 and the sealing element 2 more tightly connected, thereby improving the sealing performance.

[0046] Therefore, when the external impact pressure increases, a greater applied pressure will be generated on the sealing element 2 through the joint of the first limiting part 211 and the second limiting part 111, so that the joint of the first limiting part 211 and the second limiting part 111 fits more tightly, and after adding the reinforcing rib structure 3 on the outer side of the limiting step 11, the stress on the joint of the first limiting part 211 and the second limiting part 111 is reduced to reduce cracking, thereby providing a higher upper limit pressure bearing capacity for the early warning nut device as a whole, further improving the sealing performance and compressive durability of the device, and avoiding leakage and cracking of the early warning nut device under high impact conditions.

[0047] As a preferred embodiment, two reinforcing rib structures 3 are provided on the outer side of the limiting step 11, and the two reinforcing rib structures 3 are symmetrical with respect to the central axis of the nut housing 1. To ensure the pressure bearing capacity of the connection between the limiting step 11 and the sealing cover 21, the number of reinforcing rib structures 3 is adjusted according to actual conditions.

[0048] As a preferred embodiment, the lower end of the nut housing 1 relative to the limiting step 11 is connected with a fastening step 13, and the connection between the limiting step 11 and the fastening step 13 forms a second limiting portion 111. The sealing cover 21 on the lower side of the sealing element 2 is embedded in the fastening step 13 for limiting and fastening, and the central axis of the limiting step 11 coincides with the central axis of the fastening step 13.

[0049] The sealing element 2 is fixed in position inside the nut housing 1 by using the limiting structure at the joint of the sealing cover 21, the fastening step 13 and the limiting step 11. The diameter of the limiting step 11 is smaller than the diameter of the fastening step 13, and the limiting step 11 and the fastening step 13 are arranged in a stepped manner, so that the lower side of the sealing element 2 is embedded in the fastening step 13, and the second limiting portion 111 at the connection between the limiting step 11 and the fastening step 13 is fitted with the first limiting portion 211 of the sealing cover 21 for limiting, and the first limiting portion 211 and the second limiting portion 111 are arranged obliquely in the opposite direction of the airflow.

[0050] As a preferred embodiment, a sealing cover 12 is provided at the top of the nut housing 1, and a pressure relief hole 121 is opened on the sealing cover 12. The pressure relief hole 121 here can also be a visual hole-window structure. By adding a visual and pressure relief hole-window structure around the top housing, the residual gas injected into the evaporator component system can be quickly depressurized and diffused through the cavity and the window structure; the specific conditions of the internal cavity of the component can also be visually detected through the hole-window structure.

[0051] Further, the sealing cover 12 is connected to the limiting step 11, and the sealing cover 12, the limiting step 11, and the fastening step 13 are arranged in sequence, and the diameter of the sealing cover 12 is smaller than the diameter of the limiting step 11. The sealing element 2 is installed in the internal space formed among the sealing cover 12, the limiting step 11, and the fastening step 13, and the central axes of the sealing cover 12, the limiting step 11, and the fastening step 13 coincide with each other, and coincide with the central axis of the nut housing 1.

[0052] Further, such as Figure 1 and Figure 2 As shown, the cross section of the inner side wall of the limiting step 11 close to the sealing cover 21 is a vertical plane, and the cross section of the inner side wall of the limiting step 11 close to the sealing cover 12 is an inclined surface.

[0053] It should be understood that the sealing cover 12 is arranged at the top of the nut housing 1, and the sealing element 2 is made of rubber material, which is a highly elastic polymer material with reversible deformation. It is also a sponge with high density and is filled with extremely small gaps inside. Helium has a small molecular weight and strong high-pressure permeability. Helium can easily penetrate the rubber sealing element 2 under high-pressure environment for a long time, and the penetrated gas enters the internal space formed by the sealing cover 12, the limiting step 11, and the fastening step 13.

[0054] At present, the gap between the sealing element 2 and the nut shell 1 in the traditional warning nut is a closed space structure. Under long-term high-pressure environment, helium penetrates the sealing element 2 and enters the top space of the nut shell 1, causing the internal pressure of the system to decrease and the rebound of the warning pointer to decrease, indicating insufficient pressure, and then displaying a false alarm problem.

[0055] In this regard, compared with the traditional early warning nut structure, the utility model adds a pressure relief hole 121 on the sealing cover 12. The residual gas injected into the evaporator component system can be quickly depressurized and diffused out through the cavity and the pressure relief hole 121, thereby solving the problem of gas remaining in the confined space in the traditional nut structure, causing the early warning pin 22 to trigger abnormally, reducing the misjudgment and wrong judgment rate of process inspection, and achieving a dual improvement in production efficiency and quality cost.

[0056] Preferably, the pressure relief hole 121 can be opened on the outer peripheral side wall of the sealing cover 12, for example, Figure 1 and Figure 2 As shown, two pressure relief holes 121 are opened on the outer periphery of the sealing cover 12 , and the two pressure relief holes 121 are symmetrically arranged relative to the central axis of the sealing cover 12 .

[0057] In addition, when the pressure relief hole 121 is arranged on the outer peripheral side wall of the sealing cover 12, the cross-sectional area of ​​the pressure relief hole 121 does not exceed 1 / 4 of the cross-sectional area of ​​the sealing cover 12, so as to ensure the basic strength of the sealing cover 12. The number and aperture size of the pressure relief holes 121 are adjusted according to actual conditions, and the specific number and aperture size implementation forms all fall within the protection scope of the present utility model.

[0058] Preferably, the pressure relief hole 121 may be opened at the top of the sealing cover 12 .

[0059] As a preferred embodiment, the sealing cover 21 is provided with a connecting portion 213 and a sealing step 212, one side of the connecting portion 213 is connected to the warning ejector pin 22, the other side of the connecting portion 213 forms an elastic protrusion, and the other side of the connecting portion 213 is connected to the sealing step 212, and an air pressure space is formed between the sealing step 212 and the connecting portion 213.

[0060] The middle of the connecting portion 213 forms an elastic protrusion toward the airflow direction, or in other words, the elastic protrusion is protruded toward the sealing step 212 , and the central axis of the elastic protrusion coincides with the central axis of the nut housing 1 .

[0061] The connecting portion 213 and the sealing step 212 are both hollow structures, and the connecting portion 213 is connected to the inside of the sealing step 212, and the inside of the sealing step 212 is connected to the connector. The gas circulates inside the connector, the sealing step 212, and the connecting portion 213, and the sealing element 2 composed of the sealing step 212, the connecting portion 213 and the warning ejector pin 22 seals the connector to prevent gas leakage. The gas fills the air pressure space and squeezes the first limiting portion 211 of the sealing cover 21, so that the first limiting portion 211 is tightly combined with the second limiting portion 111.

[0062] Further, the lower end of the nut housing 1 is provided with an installation step 14, the installation step 14 is arranged on the outer periphery of the connector, and the installation step 14 is connected to the fastening step 13. Preferably, the installation step 14, the fastening step 13, the limiting step 11 and the sealing cover 12 are an integrated structure.

[0063] Furthermore, a first thread is provided on the inner side wall of the installation step 14. The first thread is locked with the second thread on the outer side of the connector to ensure the gas tightness of the device.

[0064] Furthermore, the outer peripheral surface of the nut shell 1 is circular, which is convenient for the nut shell to cooperate with the locking tool. In addition, a plurality of long strip-shaped positioning protrusions are provided on the outer peripheral side wall of the nut shell 1, and the long strip-shaped positioning protrusions extend along the central axis direction of the nut shell 1, and the positioning protrusions can be engaged with the locking tool. When the early warning nut device is locked, the locking tool is sleeved on the nut shell so that the groove on the locking tool and the positioning protrusion are engaged with each other, and the locking tool is rotated to lock the nut shell 1 on the connector, ensuring that the nut shell 1 is reliably connected to the connector and preventing the nut shell 1 from slipping off the connector under pressure.

[0065] As a preferred embodiment, the first limiting portion 211 is composed of a first limiting area 2111, a first extension area 2112 and a first transition area 2113, one end of the first transition area 2113 extends to one end of the first limiting area 2111 to form the first extension area 2112, and the first limiting area 2111 is lower than the first transition area 2113.

[0066] More preferably, the first limiting area 2111 has a curved depression, and the curved depression serves as a concentrated force point of the sealing cover 21 .

[0067] The outer surface of the sealing step 212 is inclined and recessed to form the first limiting portion 211 , and an arc angle is formed between the side wall of the connecting portion 213 and the first limiting area 2111 , that is, the first limiting area 2111 extends to the connecting portion 213 in an arc transition.

[0068] More preferably, the outer peripheral side surface of the connecting portion 213 forms an inclined surface, and the inclined surface and the inner wall of the limiting step 11 have an included angle.

[0069] As a preferred embodiment, the second limiting portion 111 is composed of a second limiting area 1111, a second extension area 1112 and a second transition area, one end of the second transition area extends to one end of the second limiting area 1111 to form the second extension area 1112, and the second limiting area 1111 is lower than the second transition area.

[0070] More preferably, the second limiting area 1111 has a curved protrusion that matches the curved depression of the first limiting area 2111. The curved protrusion serves as a concentrated force point of the limiting step 11.

[0071] The arcuate depression of the first limiting area 2111 is limitedly connected with the arcuate protrusion of the second limiting area 1111, and sealing is achieved by concentrating the force points, thereby improving the overall sealing performance of the early warning nut device.

[0072] Furthermore, the first transition zone 2113 is convex to form a first curvature structure, and correspondingly, the second transition zone is concave to form a second curvature structure.

[0073] The first extension zone 2112 transitions from the first transition zone 2113 to the arc depression of the first limiting zone 2111. Similarly, the second extension zone 1112 extends from the second transition zone to the arc depression of the second limiting zone 1111. Since the first transition zone 2113 is higher than the first limiting zone 2111 and the second transition zone is higher than the second limiting zone 1111, the combination of the two arc structures makes the limiting step 11 fit tightly with the sealing cover 21, and the concentrated force point sealing is achieved through the arc depression and the arc protrusion, thereby further improving the sealing performance.

[0074] As a preferred embodiment, the nut housing 1 is made of fully transparent PC material.

[0075] The nut housing 1 of the utility model is made of fully transparent PC polycarbonate material. Compared with the opaque POM polyoxymethylene material used in the traditional nut housing 1, the nut housing 1 made of PC material has improved performances such as impact resistance and compressive strength. At the same time, since the nut housing 1 is in a fully transparent visible state, the structure and state of the sealing element 2 inside the warning nut device can be directly visually inspected to confirm the stress breakpoint crack damage state at the junction of the nut housing 1 and the sealing element 2, the wear state of the sealing element 2, the jamming state of the warning ejector pin 22, etc., which affect the evaporator. Problems of sealing system leakage and product failure.

[0076] The operator can directly visually check and clearly see the stress breakpoints at the junction of the nut housing 1 and the sealing element 2, so as to promptly discover possible cracks or damage. Once these problems are discovered, they can be repaired or replaced in time to prevent fractures caused by stress concentration or material fatigue.

[0077] In addition, the fully transparent nut housing 1 also allows the operator to observe the wear state of the sealing element 2. As a key component in the nut device, the performance of the sealing element 2 directly affects the effect of the evaporator sealing system. Through the transparent nut housing 1, it is possible to clearly see whether the sealing element 2 is worn, aged or deformed. Once a problem with the sealing element 2 is found, the sealing element can be replaced or the sealing parameters can be adjusted to ensure the normal operation of the evaporator sealing system.

[0078] The fully transparent nut housing 1 can also help the operator to find out whether the warning ejector pin 22 is stuck or other abnormal conditions. The warning ejector pin 22 plays an important role in the nut device. Once it is stuck or cannot work properly, it will directly affect the stability and reliability of the evaporator sealing system. Through visual inspection, the operator can find problems in time and take appropriate measures to deal with them, thereby avoiding problems such as leakage of the evaporator sealing system caused by the failure of the warning ejector pin 22.

[0079] The fully transparent nut housing 1 design makes it easier for operators to conduct daily inspections and maintenance, and promptly detect and address issues that may affect the stability and reliability of the evaporator sealing system. This not only increases the product's service life and performance stability, but also reduces losses and risks caused by failures or leaks.

[0080] Of course, in other embodiments of the present invention, the fully transparent nut shell 1 may also be implemented in other forms, such as a half-transparent nut shell, a partial window transparent nut shell, which does not affect the implementation of the embodiments of the present invention.

[0081] In addition, unlike the traditional warning pin 22 used in the nut shell 1 made of POM material, which needs to be separately processed and added with masterbatch to realize the warning alarm function, the nut shell 1 made of PC material in the utility model is a fully transparent shell, and there is no need to separately process and add masterbatch to the warning pin 22, that is, the warning pin 22 can be any color.

[0082] In addition, the pressure relief hole 121 cooperates with the fully transparent PC nut shell 1. For example, without changing the structural strength, multiple pressure relief holes 121 are opened on the sealing cover 12 along the airflow direction, so that the extension and retraction states of the warning ejector pin 22 can be observed more clearly and intuitively, thereby solving the problem of abnormal triggering of the warning ejector pin 22 caused by residual gas in the sealed space.

[0083] As a preferred embodiment, a warning ejector pin 22 is provided at the other end of the sealing element 2 , and the warning ejector pin 22 and the sealing cover 21 are integrated into a structure to form the sealing element 2 .

[0084] The sealing cover 21 of the sealing element 2 can be made of chloroprene rubber or hydrogenated cyanobutyl rubber, both of which are deformable materials. The warning ejector pin 22 is also made of rubber, or can be made of chloroprene rubber or hydrogenated cyanobutyl rubber.

[0085] The sealing element 2 and the warning ejector pin 22 of the traditional warning nut are installed separately. The utility model combines the sealing element 2 and the warning ejector pin 22 into one structure, with an integrated design and integrally molded and pressurized, thereby simplifying the internal structure of the warning nut.

[0086] More preferably, the outer peripheral protrusion of the warning ejector pin 22 extends to form a positioning ring, the diameter of which matches the inner diameter of the sealing cover 12 , so that the positioning ring can be slid out and retracted along the inner wall of the sealing cover 12 .

[0087] Furthermore, the upper inner wall of the sealing cover 12 protrudes and extends to form a positioning block, which prevents the warning ejector pin 22 from overextending. When the warning ejector pin 22 slides out to the limit, the positioning block contacts the positioning ring to limit the sliding of the warning ejector pin 22.

[0088] As a preferred embodiment, a first cavity is provided at the top of the nut housing 1, and the warning ejector pin 22 is slidably disposed in the first cavity. The interior of the sealing cover 12 is a hollow structure, forming the first cavity, and the pressure relief hole 121 is connected to the first cavity.

[0089] As a preferred embodiment, a pressing cover 4 is provided inside the sealing step 212 , and an air flow hole 401 is opened in the middle of the pressing cover 4 , and the air flow hole 401 is connected to the air pressure space.

[0090] When testing the gas tightness, the nut housing 1 will be filled with high-pressure helium, and the sealing element 2 will be pushed upward by the high-pressure helium. When being pushed out, the sealing cover 21 of the sealing element 2 is pushed upward, and the first limiting portion 211 on the sealing cover 21 fits more closely with the second limiting portion 111 on the limiting step 11, and the connecting portion 213 is squeezed toward the inner wall of the nut housing 1. The high-pressure helium pushes the warning ejector pin 22 upward through the gas flow hole 401, the inside of the sealing step 212, and the inside of the connecting portion 213. The user observes whether the warning ejector pin is highlighted through the nut housing 1 and the pressure relief hole 121 made of fully transparent material to judge the tightness.

[0091] More preferably, the pressing cover 4 is composed of a first pressing portion 41 and a second pressing portion 42 , the first pressing portion 41 is protruded on the upper surface of the second pressing portion 42 , and the diameter of the first pressing portion 41 is smaller than the diameter of the second pressing portion 42 .

[0092] More preferably, the first clamping portion 41 is located inside the connecting portion 213, and the second clamping portion 42 is located in the internal space of the sealing step 212. A through hole is opened in the middle of the first clamping plate and the second clamping plate and they are interconnected to form an air flow hole 401, so that the sealing step 212 and the space inside the connecting portion 213 are connected to the air flow channel of the connector.

[0093] The connection between the first pressing part 41 and the second pressing part 42 abuts against the connection between the connecting part 213 and the sealing step 212. After the early warning nut device is tightened, the pressing cover 4 will bend slightly under the upward force, so that the force of the joint between the sealing element 2 and the nut housing 1, that is, the first limiting part 211 and the second limiting part 111, is concentrated to the vertex to achieve sealing.

[0094] As a preferred embodiment, a second cavity is formed between the outer periphery of the connecting portion 213 and the limiting step 11. The sealing element 2 is installed in the first cavity and the second cavity, and the first cavity is communicated with the second cavity.

[0095] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The orientation or position relationship indicated by directional words such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "vertical", "horizontal", "top", "bottom", etc. is usually based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description. Unless otherwise stated, these directional words 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, and therefore cannot be understood as limiting the scope of protection of the utility model; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0096] The above description is only a specific embodiment of the utility model, so that those skilled in the art can understand or implement the utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A warning nut device, characterized in that: It includes a nut shell and a sealing element, a sealing cover is provided at one end of the sealing element, the nut shell is provided with a limiting step, the lower side of the sealing cover is inclined and recessed in the opposite direction of the airflow to form a first limiting portion, a second limiting portion is provided on the lower side of the limiting step, the first limiting portion cooperates with the second limiting portion for limiting, and a reinforcing rib structure is provided on the outer side of the limiting step.

2. The warning nut device according to claim 1, characterized in that: The limiting portion is provided with a first limiting area, and the first limiting area has a curved concave shape.

3. The warning nut device according to claim 2, characterized in that: The second limiting portion is provided with a second limiting area, the first limiting area is connected to the second limiting area, and the second limiting area has an arc protrusion.

4. A warning nut device according to any one of claims 1 to 3, characterized in that: A sealing cover is arranged at the top end of the nut housing, and a pressure relief hole is opened on the sealing cover.

5. The warning nut device according to claim 4, characterized in that: The nut shell is made of fully transparent PC material.

6. The warning nut device according to any one of claims 1 to 3, characterized in that: The other end of the sealing element is connected with an early warning ejector pin, and the early warning ejector pin and the sealing cover are an integrated structure.

7. The warning nut device according to any one of claims 1 to 3, characterized in that: The lower end of the nut housing relative to the limiting step is connected with a fastening step, and the connection between the limiting step and the fastening step forms a second limiting portion, and the lower side of the sealing cover is embedded in the fastening step.

8. The early warning nut device according to claim 6, characterized in that: A first cavity is provided at the top of the nut shell, the warning ejector pin is slidably disposed in the first cavity, and the first cavity is communicated with the pressure relief hole.

9. The early warning nut device according to claim 1 or 2, characterized in that: The sealing cover is provided with a connecting portion and a sealing step, one side of the connecting portion is connected to the warning ejector pin, the other side of the connecting portion forms an elastic protrusion, and the sealing step and the connecting portion are connected to form an air pressure space.

10. The early warning nut device according to claim 9, characterized in that: A pressing cover is arranged inside the sealing step, and an air flow hole is opened in the middle of the pressing cover, and the air flow hole is communicated with the air pressure space.

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