Gas density monitoring device and observation window sealing structure thereof

Abstract

The utility model relates to a gas density monitoring device and an observation window sealing structure of the gas density monitoring device, in the observation window sealing structure of the gas density monitoring device, an observation window and a shell are fixed in the mode that the observation window is fixed on the shell in the axial direction of the shell through fixing screws, and therefore the observation window is fixed on the shell in the axial direction of the shell. In this way, the situation that in a traditional fixing mode, the shell is fixed in the radial direction of the shell through screws, local deformation is generated due to local radial force, and poor sealing is caused is avoided. Therefore, according to the gas density monitoring device and the observation window sealing structure thereof, the sealing performance of the shell of the gas density monitoring device can be improved, and the gas density monitoring device is simple in structure and easy to manufacture.

Description

TECHNICAL FIELD

[0001] The utility model relates to the gas density monitoring device field for monitoring gas density of electrical equipment, especially a kind of gas density monitoring device and observation window sealing structure suitable for high altitude. BACKGROUND

[0002] Gas density relay and gas density meter are widely used in power system, and they are commonly used gas density monitoring devices, which are generally divided into oil-free type and oil-filled type. The performance of these gas density monitoring devices directly affects the reliable and safe operation of the related system. Therefore, ensuring the reliable and safe operation of these gas density monitoring devices has become one of the important tasks and work of people. Especially in high-altitude areas or oil-filled devices, the increase of altitude will cause the atmospheric pressure to change, which will affect the precision. Therefore, we need the gas density monitoring device to realize the sealing of the whole shell, to completely isolate the atmospheric pressure inside and outside the shell, and to avoid the occurrence of poor precision or oil leakage.

[0003] At present, due to the poor sealing performance of the shell of these density relay monitoring devices, the internal pressure of the shell cannot be maintained at the set standard pressure, which leads to inaccurate measurement of the gas density monitoring device. Through research and analysis, it is found that the gas pipe or electrical connector connected to the outer wall of the shell generates a pulling load on the local shell, which causes local deformation at the position where the gas pipe or electrical connector is connected to the outer wall of the shell. The shell of the existing gas density monitoring device is generally a thin-walled cylindrical structure processed by stamping. The installation of the gas pipe or electrical connector requires an installation hole to be formed on the outer wall of the shell, which leads to insufficient rigidity at the position where the gas pipe or electrical connector is connected to the shell, and the shell is prone to local deformation, which causes a small deformation of the sealing surface and leads to poor sealing. The sealing effect of the shell is not good, and oil leakage or gas leakage often occurs, which brings errors in precision and losses to users, and seriously affects normal use. Therefore, how to improve the sealing performance of the shell of the gas density monitoring device is a technical problem that needs to be solved in this field. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a gas density monitoring device and an observation window sealing structure thereof, which can improve the sealing performance of the shell of the gas density monitoring device.

[0005] In order to solve the above technical problems, the utility model provides an observation window sealing structure of a gas density monitoring device, which comprises a shell and an observation window. The observation window is sealed on the opening at the front end of the shell to form a sealed cavity in the shell. The sealed cavity is used to accommodate a pressure detection tube and an indicating mechanism.

[0006] The observation window seals the opening of the front end of the shell, and a sealing ring is arranged between the outer side wall of the observation window and the inner side wall of the front end of the shell to seal the observation window and the shell.

[0007] Preferably, the outer side wall of the observation window is provided with a first sealing groove, and the sealing ring is arranged in the first sealing groove; the inner side wall of the front end of the shell is provided with a stop surface, the observation window is a circular plate structure, the rear end surface of the observation window towards the inside of the shell abuts against the stop surface, an annular flange is arranged on the outer side of the observation window, the annular flange is pressed on the edge of the front end surface of the observation window, and the observation window is exposed from the inner hole of the annular flange; the annular flange is provided with first through holes which are uniformly distributed in the circumferential direction, and the fixing screws are arranged in the threaded holes through the through holes.

[0008] Preferably, the inner side wall of the shell is provided with a second sealing groove, and the sealing ring is arranged in the second sealing groove; the observation window comprises a sealing part and a flange part, the diameter of the flange part is greater than that of the sealing part, the sealing part cooperates with the sealing ring, the flange part is provided with second through holes which are uniformly distributed in the circumferential direction, and the fixing screws are arranged in the threaded holes through the through holes.

[0009] More preferably, a protective cover is arranged on the outer side of the shell, the protective cover comprises a cylinder and an annular protective rim arranged at the front end of the cylinder, the cylinder is wrapped on the outer side wall of the shell, and the annular protective rim extends towards the middle of the cylinder and covers the edge of the observation window.

[0010] Further, the protective rim covers the fixing screws.

[0011] Further, the inner side edge of the protective rim towards the center is tightly attached to the front end surface of the observation window.

[0012] Further, the rear end of the protective cover is welded to the shell.

[0013] Preferably, the bottom plate of the rear end of the shell is further provided with a filling inlet, and a sealing plug is connected to the filling inlet.

[0014] Preferably, the side wall of the shell is processed from a metal pipe.

[0015] Corresponding to the observation window sealing structure of the gas density monitoring device, the utility model provides a kind of gas density monitoring device, including the observation window sealing structure of the gas density monitoring device described in above technical solution or any preferred technical solution thereof.

[0016] As described above, the utility model relates to a kind of gas density monitoring device and its observation window sealing structure, with following beneficial effects: in the observation window sealing structure of a kind of gas density monitoring device of the utility model, the fixed mode of observation window and shell is to use fixed screw and observation window is fixed on shell along shell axis direction, like this, shell will not be locally deformed by partial radial force as traditional fixed mode is fixed by screw along shell radial direction, leading to poor sealing.Therefore, the utility model relates to a kind of gas density monitoring device and its observation window sealing structure can improve the sealing performance of gas density monitoring device shell, and simple structure, easy to manufacture. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is shown as the front view of gas density monitoring device, from the angle of the axis direction of shell, remove observation window.

[0018] Figure 2 It is shown as the schematic diagram of the first kind of implementation of the observation window sealing structure of the utility model's gas density monitoring device.

[0019] Figure 3 It is shown as the schematic diagram of the second kind of implementation of the observation window sealing structure of the utility model's gas density monitoring device.

[0020] Element number explanation

[0021] 1 housing 2 observation window 3 sealed cavity 4 display component 5 pressure detection tube 6 indicating mechanism 7 movement 8 first sealing groove 9 second sealing groove 10 sealing ring 11 threaded hole 12 fixing screw 13 stop face 14 annular flange 15 sealing portion 16 flange portion 17 protective cover 18 annular protective edge 19 filling inlet 20 sealing plug 21 filling connection tube DETAILED DESCRIPTION

[0022] The following is by specific embodiment to illustrate the embodiment of the utility model, person skilled in the art can be easily understood from the content disclosed in the specification the other advantages and effects of the utility model.

[0023] It is known that the structure, proportion, size etc. shown in the drawings attached to the present specification, are only used to cooperate with the content disclosed in the specification, for person skilled in the art to understand and read, and not to limit the limiting conditions that the utility model can be implemented, so it does not have the technical essence, any modification of structure, change of proportion relationship or adjustment of size, in the effect and purpose that can be generated and can be achieved under the utility model, should still fall within the scope of the technical content disclosed in the utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" etc. cited in the specification, are only for the clear understanding of the description, and not to limit the scope of the utility model that can be implemented, the change or adjustment of relative relationship, when no substantial change of technical content, also be regarded as the scope of the utility model that can be implemented.

[0024] Please refer to Figure 1The utility model relates to a gas density monitoring device, including the shell 11 of sealed arrangement, the sealed cavity 3 has in the shell 11, be equipped with display component 4 in sealed cavity 3, display component 4 includes pressure detection pipe 5, indicating mechanism 6, movement 7 and so on spare component, pressure detection pipe 5 produces deformation according to the gas pressure in its pipe and thus acts on indicating mechanism 6 to make indicating mechanism 6 indicate the gas density in pressure detection pipe 5, the shell 11 is connected with the inflation connecting pipe 21, the inflation connecting pipe 21 is communicated pressure detection pipe 5 and is used to inflate pressure detection pipe 5.

[0025] Please refer to Figure 2 And Figure 3 The utility model provides a kind of observation window sealing structure of gas density monitoring device, including shell 1 and observation window 2, the observation window 2 covers the opening on the front end of shell 1 to make the inner cavity of shell 1 form sealed cavity 3, the sealed cavity 3 is used to accommodate pressure detection pipe 5 and indicating mechanism 6;The opening of the front end of shell 1 is sealed by observation window 2, and sealing ring 10 is arranged between the outer side wall of observation window 2 and the inner side wall of the front end of shell 1 to seal between observation window 2 and shell 1;Threaded hole 11 is uniformly distributed on the end face of the front end of shell 1 along circumferential direction, and fixed screw 12 is installed in threaded hole 11, and fixed screw 12 is fixed on shell 1 with observation window 2.

[0026] In the observation window sealing structure of the gas density monitoring device of the utility model, the fixed mode of observation window 2 and shell 1 is that fixed screw 12 is fixed on shell 1 with observation window 2 along the axial direction of shell 1, so that shell 1 will not be locally deformed by local radial force as in the traditional fixed mode, which leads to poor sealing. Therefore, the gas density monitoring device and the observation window 2 sealing structure thereof can improve the sealing performance of the shell 1 of the gas density monitoring device, and the structure is simple and easy to manufacture.

[0027] Figure 2 As the first preferred embodiment of the utility model, please refer to Figure 2 The outer side wall of observation window 2 is provided with first sealing groove 8, and sealing ring 10 is installed in first sealing groove 8;The inner side wall of the front end of shell 1 is provided with stop face 13, the observation window 2 is circular plate structure, and the rear end face of observation window 2 towards the inside of shell 1 abuts on stop face 13, and the outer side of observation window 2 is provided with an annular flange 14, and annular flange 14 is pressed on the edge of the front end face of observation window 2, and observation window 2 is exposed from the inner hole of annular flange 14;Annular flange 14 is provided with first through hole uniformly distributed along the circumferential direction, and fixed screw 12 passes through the through hole and is installed in threaded hole 11.

[0028] In order to avoid the influence of high altitude on the monitoring precision of the gas density monitoring device, compensation gas or oil can be filled into the sealed cavity 3 of the shell 1, and a filling port 19 is further arranged on the bottom plate at the rear end of the shell 1, and a sealing plug 20 is connected to the filling port 19.

[0029] As a preferred embodiment, the side wall of the shell 1 is machined from a metal pipe, and an aluminum metal pipe or a stainless steel metal pipe is used to machine the cylindrical side wall of the shell 1, so that the side wall of the shell 1 has high rigidity and is not easy to deform to cause poor sealing.

[0030] Figure 3 As shown in the first preferred embodiment of the utility model, referring to Figure 3 , the inner side wall of the shell 1 is provided with a second sealing groove 9, and the sealing ring 10 is arranged in the second sealing groove 9; the observation window 2 comprises a sealing part 15 and a flange part 16, the diameter of the flange part 16 is larger than that of the sealing part 15, the sealing part 15 cooperates with the sealing ring 10, and the flange part 16 is provided with second through holes which are uniformly distributed in the circumferential direction, and the fixing screw 12 is arranged in the threaded hole 11 through the through holes.

[0031] As a preferred embodiment, in order to protect the shell 1 from erosion and strengthen the strength of the shell 1, as shown in Figure 3 , a protective cover 17 is arranged on the outer side wall of the shell 1, the protective cover 17 comprises a cylinder and an annular protective edge 18 arranged at the front end of the cylinder, the cylinder is wrapped on the outer side wall of the shell 1, the annular protective edge 18 extends towards the middle of the cylinder, the annular protective edge 18 is wrapped on the edge of the observation window 2, and the annular protective edge 18 can prevent rainwater, dust and the like from entering the gap between the observation window 2 and the shell 1 to cause erosion. In order to prevent rainwater and dust from entering the gap at the fixing screw 12 to cause erosion, the protective edge covers the fixing screw 12. In order to achieve better dustproof and waterproof effects, the inner side edge of the protective edge towards the center is tightly attached to the front end surface of the observation window 2, so that rainwater and dust are not easy to enter the gap between the observation window 2 and the shell 1.

[0032] As a preferred embodiment, the rear end of the protective cover 17 is welded to the shell 1, so that the sealing surface of the front end of the shell 1 is far away, and the welding stress is not easy to cause adverse effects on the sealing.

[0033] The observation window sealing structure of the gas density monitoring device of the utility model can be used for a gas density meter (the gas density meter is also commonly referred to as a gas pressure meter) or a gas density relay.

[0034] Corresponding to the observation window sealing structure of the gas density monitoring device, the utility model provides a gas density monitoring device, including above -mentioned technical scheme or its any preferred technical scheme gas density monitoring device's observation window sealing structure.

[0035] The gas density monitoring device is used for a gas density relay, the shell 1 is further provided with an alarm switch, the pressure detection pipe 5 can drive the alarm switch to be closed or opened when being deformed, the cable connector is further connected to the shell 1, and the cable connector is connected to the alarm switch.

[0036] The gas density monitoring device is very suitable for the application environment that the difference between environmental air pressure and standard atmospheric pressure is large, such as high altitude area.The sealing type gas density monitoring device greatly improves the reliability of the sealing performance of the gas density relay shell 1 in structure, can effectively avoid the influence of atmospheric pressure change on precision, and can also completely avoid oil leakage or air leakage in the oil-filled density relay.

[0037] In summary, the utility model effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0038] The above embodiment only exemplarily illustrates the principle and effect of the utility model, and is not used to limit the utility model.Anyone skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model.Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A sealed structure of a viewing window of a gas density monitoring device, comprising a housing and a viewing window, the viewing window covering an opening at a front end of the housing to form a sealed cavity in an inner cavity of the housing, the sealed cavity being used to accommodate a pressure detecting tube and an indicating mechanism; characterized in that: the viewing window covers the opening at the front end of the housing, a sealing ring is arranged between an outer sidewall of the viewing window and an inner sidewall of the front end of the housing to seal the viewing window and the housing; and a plurality of threaded holes are uniformly distributed in a circumferential direction on an end face of the front end of the housing, and a fixing screw is arranged in each of the threaded holes to fix the viewing window on the housing. The outer sidewall of the viewing window is provided with a first sealing groove, and the sealing ring is arranged in the first sealing groove; an inner sidewall of the front end of the housing is provided with a stop face, the viewing window is in a circular plate structure, a rear end face of the viewing window towards the inside of the housing abuts against the stop face, an outer side of the viewing window is provided with an annular flange, the annular flange is pressed on a rim of a front end face of the viewing window, and the viewing window is exposed from an inner hole of the annular flange; the annular flange is provided with through holes uniformly distributed in the circumferential direction, and the fixing screw is arranged in the threaded hole through the through hole. The inner sidewall of the housing is provided with a second sealing groove, and the sealing ring is arranged in the second sealing groove; the viewing window comprises a sealing part and a flange part, a diameter of the flange part is greater than a diameter of the sealing part, the sealing part cooperates with the sealing ring, the flange part is provided with through holes uniformly distributed in the circumferential direction, and the fixing screw is arranged in the threaded hole through the through hole.

2. The observation window sealing structure of a gas density monitoring apparatus according to claim 1, characterized by, A protective cover is sleeved on an outer side of the housing, the protective cover comprises a cylinder and an annular protective rim arranged at a front end of the cylinder, the cylinder is wrapped on the outer sidewall of the housing, the annular protective rim extends towards a middle of the cylinder, and the annular protective rim covers a rim of the viewing window.

3. The observation window sealing structure of a gas density monitoring apparatus according to claim 1, characterized by, The protective rim covers the fixing screw.

4. The observation window sealing structure of a gas density monitoring apparatus according to claim 3, characterized by, An inner side rim of the protective rim towards the center is tightly attached to the front end face of the viewing window.

5. The observation window sealing structure of a gas density monitoring apparatus according to claim 4, characterized by, A rear end of the protective cover is welded to the housing.

6. The observation window sealing structure of a gas density monitoring apparatus according to claim 4, characterized by, A filling inlet is further arranged on a bottom plate of the rear end of the housing, and a sealing plug is connected to the filling inlet.

7. The observation window sealing structure of a gas density monitoring apparatus according to claim 4, wherein The sidewall of the housing is processed from a metal pipe.

8. The observation window sealing structure of a gas density monitoring apparatus according to claim 1, characterized by, The sealed structure of the viewing window of the gas density monitoring device is provided.

9. The observation window sealing structure of a gas density monitoring apparatus according to claim 1, wherein ​ 10. A gas density monitoring device, characterized by, ​

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