Gas density monitoring device

Abstract

The present invention provides a gas density monitoring device, comprising: a detection unit, including an adapter and a temperature and pressure sensor; a case, having a first end and a second end in the axial direction, the case being a cylindrical structure with an opening provided at the second end, and the detection unit being located outside the case; a mounting bracket, provided inside the case and connected to the end panel, the mounting bracket being provided with a first threaded hole; a transmitter main board, the mounting bracket and the transmitter main board being sequentially connected along a first direction, the transmitter main board having a second threaded hole with the same diameter as the first threaded hole and axially aligned with the first threaded hole, so that the transmitter main board is threadedly connected to the mounting bracket; a cover, detachably connected to the second end of the case to close the opening; and a cable, provided outside the case and electrically connected to the transmitter main board. The gas density monitoring device provided by the present invention can conveniently achieve function expansion and meet the diverse needs of customers.

Description

Technical Field

[0001] The present invention relates to the technical field of gas monitoring, and in particular to a gas density monitoring device. Background Art

[0002] With the development of industrial production and science and technology, gases are increasingly widely used in industries, medicine, cutting-edge science and technology, and daily life. For example, the application of inert gases as protective gases, the application of high-purity gases as industrial media, etc. Gas density is an important indicator to measure the working performance of gases.

[0003] Taking SF6 (sulfur hexafluoride) gas as an example, under a uniform electric field, the insulation of SF6 is three times that of air, and under four atmospheric pressures, its insulation is equivalent to that of transformer oil. Therefore, electrical products using sulfur hexafluoride gas as an arc extinguishing medium and an insulating medium have been widely used in the power sector and industrial and mining enterprises. For example, SF6 circuit breakers, GIS, SF6 insulated transmission pipelines, SF6 transformers, etc. When in use, if SF6 leaks, it cannot ensure the reliable and safe operation of SF6 electrical products. Therefore, it is necessary to monitor the density of SF6 in real time.

[0004] However, the function settings of the gas density monitoring devices in the prior art are fixed, and the interchangeability is poor, which cannot meet the diverse needs of customers. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems in the prior art.

[0006] The present invention provides a gas density monitoring device, including: a detection part, including an adapter and a temperature and pressure sensor arranged inside the adapter, and the adapter can be communicated with the gas to be detected; a meter housing, having a first end and a second end in the axial direction, the meter housing is a cylindrical structure with an opening provided at the second end, and the detection part is installed outside the meter housing through the end panel at the first end; a mounting bracket, arranged inside the meter housing and connected to the end panel, and a first threaded hole is provided on the mounting bracket; a transmitter main board, electrically connected to the temperature and pressure sensor, the mounting bracket and the transmitter main board are sequentially connected along a first direction, and the first direction is parallel to the axial direction and points from the first end to the second end; the transmitter main board has a second threaded hole with the same diameter as the first threaded hole and axially aligned with the first threaded hole, so that the transmitter main board and the mounting bracket are threadedly connected; a cover, detachably connected to the second end of the meter housing to close the opening; a cable, arranged outside the meter housing and electrically connected to the transmitter main board.

[0007] Optionally, the mounting bracket includes a first single-headed through stud and a mounting plate connected in sequence along the first direction. The screw part of the first single-headed through stud is screwed with the watch case; the head of the first single-headed through stud abuts against the mounting plate, and a counterbore is provided on the mounting plate. The mounting plate is screwed with the head of the first single-headed through stud through a bolt in the counterbore.

[0008] Optionally, it further includes a relay main board electrically connected to the transmitter main board. The relay main board is located downstream of the transmitter main board along the first direction. The relay main board has a third threaded hole with the same diameter as the second threaded hole and axially aligned with the second threaded hole, so that the relay main board and the transmitter main board are mechanically connected by threads.

[0009] Optionally, the relay main board and the transmitter main board are connected by a second single-headed through stud. The screw part of the second single-headed through stud is screwed with the first threaded hole and the second threaded hole at the same time; the head of the second single-headed through stud abuts against the side surface of the relay main board facing the transmitter main board. The relay main board is screwed with the head of the second single-headed through stud through a bolt in the third threaded hole.

[0010] Optionally, the watch case and the cover are connected by threads. Among them, the watch case has a first external thread, and the cover has a first internal thread; a first sealing ring is provided between the watch case and the cover. During the screwing process of the first external thread and the first internal thread, the first sealing ring can be pressed against the bottom wall of the cover by the thread end face of the first external thread.

[0011] Optionally, the outer peripheral surface of the first sealing ring is in the shape of a stepped shaft. The small-diameter part of the outer peripheral surface fits with the inner surface of the watch case, and the large-diameter part of the outer peripheral surface fits with the inner surface of the cover.

[0012] Optionally, the end face of the cover has an observation hole, and the monitoring device further includes a display. The display is used to externally display the density value of the gas to be detected through the observation hole; the maximum outer diameter of the display is equal to the inner diameter of the cover. During the screwing process of the first external thread and the first internal thread, the display can be pressed against the bottom wall of the cover by the thread end face of the first external thread.

[0013] Optionally, a first sealing ring is further provided between the display and the thread end face of the first external thread. During the screwing process of the first external thread and the first internal thread, the first sealing ring and the display can be pressed against the bottom wall of the cover at the same time.

[0014] Optionally, the display includes a display main board, a panel, and a panel film that are sequentially connected in a first direction, and the three are connected by a threaded fastener that penetrates through all three simultaneously; wherein, the display main board is electrically connected to the transmitter main board; the threaded end face of the first external thread presses the panel to press the display onto the cover.

[0015] Optionally, the watch case is connected to the cover through an adapter cover, and openings are provided at both axial ends of the adapter cover; the watch case and the adapter cover, and the adapter cover and the cover are both connected by threads; the monitoring device includes a relay main board electrically connected to the transmitter main board, and a display main board electrically connected to the relay main board.

[0016] Optionally, one end of the adapter cover close to the watch case has a second internal thread, and an annular rib is provided on the inner wall of the adapter cover, and the annular rib is located downstream of the second internal thread in the first direction; a second sealing ring is provided between the watch case and the adapter cover, and during the screwing process of the first external thread and the second internal thread, the second sealing ring can be pressed against the annular rib by the threaded end face of the first external thread.

[0017] Optionally, an inner cavity extending along the axial direction is provided inside the adapter, and the size of the inner cavity matches the outer shape of the temperature and pressure sensor, so that the temperature and pressure sensor is embedded in the inner cavity, and one axial end of the temperature and pressure sensor abuts against the end panel; the adapter has a fitting surface that fits with the end panel of the watch case, and a threaded blind hole is provided on the fitting surface, and the adapter and the end panel of the watch case are connected by an assembly bolt screwed into the threaded blind hole; the signal wire of the temperature and pressure sensor penetrates into the watch case through a wire passing hole provided on the end panel.

[0018] Optionally, the other axial end of the temperature and pressure sensor is connected to the bottom wall of the inner cavity through a third sealing ring, and the extending direction of the assembly bolt is parallel to the axial direction. When the assembly bolt is screwed, the third sealing ring can be compressed by the temperature and pressure sensor.

[0019] Optionally, an annular groove is provided in the middle of the axial side of the temperature and pressure sensor, and a fourth sealing ring for sealing the side of the temperature and pressure sensor and the side wall of the inner cavity is provided in the annular groove; one end of the inner cavity facing the watch case has an opening, and a chamfer is provided at the opening, and a fifth sealing ring is provided in the annular cavity formed by the chamfer, the temperature and pressure sensor, and the end panel of the first end.

[0020] Optionally, a sixth sealing ring is provided between the fitting surface and the end panel, and the sixth sealing ring is located radially outside the threaded blind hole.

[0021] Optionally, the watch case includes a snap ring disposed on the inner surface of the end panel, and the assembly bolts sequentially pass through the snap ring and the end panel to be screwed into the threaded blind hole; the mounting bracket is threadedly connected to the snap ring.

[0022] Optionally, the transmitter main board has a 485 remote transmission module.

[0023] Optionally, the gas to be detected is SF6 gas.

[0024] For the monitoring device provided in this embodiment, a threaded hole is provided on the transmitter main board. This threaded hole can not only serve as the connection interface between the transmitter main board and the mounting bracket, but also as the connection interface for subsequent extended electronic components; that is to say, when the monitoring device needs to be functionally extended, other electronic components (for example, other function main boards) can be conveniently connected to the transmitter main board through this threaded hole to quickly achieve functional extension. In addition, the connection between the watch case and the cover is detachable. When the monitoring device needs to be functionally extended, the cover can be opened, the electronic components to be extended can be connected to the transmitter main board, and then the cover can be closed, which can conveniently achieve functional extension and meet the diverse needs of customers. Description of the Drawings

[0025] Figure 1a An exploded view of a monitoring device provided by an embodiment of the present invention;

[0026] Figure 1b A cross-sectional view of a monitoring device provided by an embodiment of the present invention;

[0027] Figure 1c A connection structure diagram of the watch case and the cover of a monitoring device provided by an embodiment of the present invention;

[0028] Figure 2a Another exploded view of a monitoring device provided by an embodiment of the present invention;

[0029] Figure 2b Another cross-sectional view of a monitoring device provided by an embodiment of the present invention;

[0030] Figure 3a Another exploded view of a monitoring device provided by an embodiment of the present invention;

[0031] Figure 3b Another cross-sectional view of a monitoring device provided by an embodiment of the present invention;

[0032] Figure 4a Another exploded view of a monitoring device provided by an embodiment of the present invention;

[0033] Figure 4bA cross-sectional view of another monitoring device provided by an embodiment of the present invention. Detailed implementation manners

[0034] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description.

[0035] In the present invention, electrical connection refers to a connection that can transmit signals (including control signals and data signals), and mechanical connection refers to a structural connection for fixing the positions of various components.

[0036] Reference Figure 1a and Figure 1b , this embodiment provides a gas density monitoring device 1, including a detection unit 11, a case 12, a mounting bracket 13, a transmitter main board 16, and a cover 15.

[0037] The detection unit 11 includes an adapter 112 and a temperature and pressure sensor 111, and the temperature and pressure sensor 111 is disposed inside the adapter 112. The adapter 112 can be communicated with the gas to be detected. For example, it is communicated with an SF6 insulated transmission pipe, so that the gas to be detected (for example, SF6 gas) can enter the inside of the adapter 112 and be sensed by the temperature and pressure sensor 111 disposed inside the adapter 112. After the temperature and pressure sensor 111 senses the temperature and pressure of the gas to be detected, it converts them into corresponding electrical signals and outputs them. As is well known in the art, according to the temperature and pressure of the gas to be detected, the density of the gas to be detected can be calculated. Therefore, the function of the temperature and pressure sensor 111 is to provide the necessary parameters for calculating the density of the gas to be detected. It should be noted that the gas to be detected is not limited to SF6 gas and can be any gas, such as CF4, a mixed gas of SF6 and nitrogen, etc.

[0038] The case 12 has a first end 12a and a second end 12b in the axial direction. Among them, the first end 12a has an end panel 121, and the second end 12b has an opening. That is to say, the case 12 is a cylindrical structure with an opening at the second end 12b. The detection unit 11 is installed as an independent component on the end panel 121 at the first end 12a of the case 12, and the inside of the case 12 is used to accommodate the main boards of the monitoring device 1.

[0039] The mounting bracket 13 is disposed inside the watch case 12 for mounting the transmitter main board 16. Specifically, the mounting bracket 13 is connected to the end panel 121, for example, connected to the end panel 121 by threads. Further, a first threaded hole 13a is provided on the mounting bracket 13.

[0040] The transmitter main board 16 is electrically connected to the temperature and pressure sensor 111, and can receive the temperature signal and pressure signal detected by the temperature and pressure sensor 111, and can further convert the temperature signal and pressure signal into the density of the gas to be detected. The mounting bracket 13 and the transmitter main board 16 are sequentially connected along a first direction (the direction shown as A in the figure, that is, the direction parallel to the above-mentioned axis and pointing from the first end 12a to the second end 12b), that is to say, the transmitter main board 16 is mounted on the side of the mounting bracket 13 facing the second end 12b. The transmitter main board 16 has a second threaded hole 161 with the same diameter as the first threaded hole 13a. The first threaded hole 13a and the second threaded hole 161 are axially aligned, and the transmitter main board 16 and the mounting bracket 13 are connected by a threaded fastener passing through the first threaded hole 13a and the second threaded hole 161. In this embodiment, there are 2 first threaded holes 13a and 2 second threaded holes 161 respectively. In other embodiments, the number of the first threaded holes and the second threaded holes can also be other numbers.

[0041] The cover 15 is detachably connected to the second end 12b of the watch case 12 to close the opening. That is, the cover 15 can close the second end 12b of the watch case 12, so as to jointly form a closed space with the watch case 12 to protect the components inside the watch case 12.

[0042] The cable 17 is disposed outside the watch case 12 and is electrically connected to the transmitter main board 16 to exchange signals with the transmitter main board 16, that is, it can input signals to the transmitter main board 16 and also transmit the signals in the transmitter main board 16 outward.

[0043] In the monitoring device 1 provided in this embodiment, a second threaded hole 161 is provided on the transmitter main board 16. The second threaded hole 161 can not only be used as the connection interface between the transmitter main board 16 and the mounting bracket 13, but also be used as the connection interface for subsequent extended electronic components; that is to say, when the monitoring device 1 needs to be functionally extended, other electronic components (for example, other function main boards) can be conveniently connected to the transmitter main board 16 through the second threaded hole 161 to quickly realize functional extension. In addition, the watch case 12 and the cover 15 are detachably connected. When the monitoring device 1 needs to be functionally extended, the cover 15 can be opened, the electronic components to be extended can be connected to the transmitter main board 16, and then the cover 15 can be covered, so that the functional extension can be conveniently realized.

[0044] In this embodiment, the mounting bracket 13 includes a first single-headed through stud 131 and a mounting plate 132 connected in sequence along the first direction. The single-headed through stud is a prior art, including a head and a screw part. The screw part has an external thread, and the head has an internal thread. Preferably, the external thread and the internal thread have the same thread type (including tooth shape, nominal diameter, and pitch). The screw part of the first single-headed through stud 131 is screwed with the watch case 12, which can be a direct screw, for example, screwed with the end face plate 121; or an indirect screw, for example, screwed with a transition plate connected to the end face plate 121.

[0045] The end face of the head of the first single-headed through stud 131 abuts against the mounting plate 132, specifically against the side of the mounting plate 132 facing the first end 12a. A counterbore 132a is provided at the position of the mounting plate 132 corresponding to the first single-headed through stud 131. A bolt is provided in the counterbore 132a. The bolt passes through the counterbore 132a and is screwed with the internal thread of the head of the first single-headed through stud 131 to fix the mounting plate 132 on the first single-headed through stud 131, thereby indirectly fixing the mounting plate 132 on the watch case 12. In this embodiment, the bolt in the counterbore 132a is recessed in the counterbore 132a, that is, the bolt head of the bolt does not protrude from the surface of the mounting plate 132. In this embodiment, the number of the first single-headed through studs 131 is 2. In other embodiments, the number of the first single-headed through studs can also be other numbers.

[0046] In this embodiment, the watch case 12 and the cover 15 are connected by threads. Among them, the watch case 12 has a first external thread 122, and the cover 15 has a first internal thread 151. Further, a first sealing ring 21 is provided between the watch case 12 and the cover 15. During the screwing process of the first external thread 122 and the first internal thread 151, the first sealing ring 21 can be pressed against the bottom wall of the cover 15 by the thread end face 122a of the first external thread 122.

[0047] Specifically, referring to Figure 1c , the outer peripheral surface of the first sealing ring 21 is in the shape of a stepped shaft. The small-diameter part of the outer peripheral surface fits with the inner surface of the watch case 12, and the large-diameter part of the outer peripheral surface fits with the inner surface of the cover 15. The thread end face 122a of the first external thread 122 can squeeze the stepped surface of the outer peripheral surface, thereby pressing the first sealing ring 21 against the bottom wall of the cover 15, so as to realize the sealing between the watch case 12 and the cover 15.

[0048] Continuing to refer to Figure 1a and Figure 1b , an inner cavity extending axially is provided inside the adapter 112. The size of the inner cavity matches the outer shape of the temperature and pressure sensor 111 (that is, the size of the inner cavity is basically equal to the outer dimension of the sensor). The temperature and pressure sensor 111 is embedded in the inner cavity, and one axial end of the temperature and pressure sensor 111 abuts against the end face plate 121.

[0049] The adapter 112 has a fitting surface 112a that fits against the end panel 121 of the watch case 12. A threaded blind hole 112b is formed in the fitting surface 112a. A through hole is formed at a position on the end panel 121 corresponding to the threaded blind hole 112b. The adapter 112 and the end panel 121 of the watch case 12 are connected by an assembly bolt 31 that passes through the through hole and is screwed into the threaded blind hole 112b.

[0050] A wire passing hole 121a is also formed in the end panel 121. The signal wire 111a of the temperature and pressure sensor 111 passes through the wire passing hole 121a and penetrates into the interior of the watch case 12 to be electrically connected to the transmitter main board 16.

[0051] The other axial end of the temperature and pressure sensor 111 is connected to the bottom wall of the inner cavity by a third sealing ring 23 to prevent the gas to be detected from leaking into the outside air or the interior of the watch case 12. The extending direction of the assembly bolt 31 is parallel to the axis. When the assembly bolt 31 is screwed, the end panel 121 presses the temperature and pressure sensor 111, and the temperature and pressure sensor 111 presses the third sealing ring 23. Thus, by screwing the assembly bolt 31, the third sealing ring 23 can be compressed, improving the sealing effect of the third sealing ring 23.

[0052] An annular groove is provided in the middle of the side surface of the temperature and pressure sensor 111 in the axial direction. A fourth sealing ring 24 for sealing the side surface of the temperature and pressure sensor 111 and the side wall of the inner cavity is arranged in the annular groove. One end of the inner cavity facing the watch case 12 has an opening, and a chamfer is formed at the opening. A fifth sealing ring 25 is arranged in the annular cavity formed by the chamfer, the temperature and pressure sensor 111, and the end panel 121 of the first end 12a. In this embodiment, the annular groove on the temperature and pressure sensor 111 and the chamfer space at the opening of the inner cavity are skillfully utilized to arrange multiple seals, effectively ensuring the sealing effect.

[0053] In addition, a sixth sealing ring 26 is provided between the fitting surface 112a and the end panel 121 of the first end 12a. The sixth sealing ring 26 is located radially outside the threaded blind hole 112b, so that the sixth sealing ring 26 has a larger specification size, further improving the sealing effect. In addition, due to its flexibility, the sixth sealing ring 26 can also correct the manufacturing and assembly errors.

[0054] In this embodiment, the watch case 12 includes a retaining ring 32 disposed on the inner surface of the end panel 121. The assembly bolt 31 sequentially passes through the retaining ring 32 and the end panel 121 to be screwed with the threaded blind hole 112b. Further, the mounting bracket 13 can be screwed onto the retaining ring 32 to achieve an indirect connection between the mounting bracket 13 and the end panel 121. In this embodiment, by using the retaining ring 32 as a transfer structure, the connection between multiple components is realized. Its advantages are as follows: First, the retaining ring 32 has a regular structure, is convenient to process, and is easy to obtain high manufacturing and assembly accuracy. Second, the retaining ring 32 can connect multiple components at the same time, which is beneficial to make the entire monitoring device 1 compact.

[0055] Reference Figure 2a and Figure 2b and, the monitoring device 1 provided in this embodiment can also integrate a relay main board 18. The relay main board 18 is electrically connected to the transmitter main board 16 and can transmit signals with the transmitter main board 16. The relay main board 18 can issue a digital signal according to the density value of the gas to be detected. For example, when the density value of SF6 gas is less than the set value, the relay issues a digital signal to warn the staff and timely detect whether SF6 leaks. The relay main board 18 is located on the side of the transmitter main board 16 facing the second end 12b, that is, the transmitter main board 16 and the relay main board 18 are arranged in sequence along the first direction. The relay main board 18 is provided with a third threaded hole 181, and the third threaded hole 181 has the same diameter as the second threaded hole 161 and is axially aligned with the second threaded hole 161, so that the relay main board 18 and the transmitter main board 16 are threadedly connected.

[0056] In this embodiment, the relay main board 18 and the transmitter main board 16 are connected by a second single-headed through stud 182. The second single-headed through stud 182 is simultaneously screwed with the first threaded hole 13a and the second threaded hole 161 to fix the transmitter main board 16 on the mounting plate 132. The head of the second single-headed through stud 182 abuts against the relay main board 18. Specifically, the head of the second single-headed through stud 182 abuts against the side of the relay main board 18 facing the transmitter main board 16. The relay main board 18 is screwed with the inner thread of the head of the second single-headed through stud 182 through a bolt in the third threaded hole 181, so as to be connected to the second single-headed through stud 182 and indirectly connected to the transmitter main board 16. For the monitoring device 1 provided in this embodiment, the distance between the relay main board 18 and the transmitter main board 16 is at least equal to the length of the head of the second single-headed through stud 182, which is beneficial to the surface heat dissipation of each main board.

[0057] Reference Figure 3a and Figure 3b, the monitoring device 1 provided in this embodiment may also be integrated with a display 19. At this time, the end face of the cover 15 has an observation hole 15a, and the display 19 can display the density value of the gas to be detected through the observation hole, so that the staff can conveniently read the real-time density value of the gas to be detected.

[0058] The maximum outer diameter of the display 19 is equal to the inner diameter of the cover 15, so that during the screwing process of the first external thread 122 and the first internal thread 151, the thread end face 122a of the first external thread 122 can push one end face of the display 19, thereby pressing the display 19 against the bottom wall of the cover 15 (similar to the principle of pressing the first sealing ring 21 described above), so as to realize the fixation among the watch case 12, the cover 15, and the display 19.

[0059] In this embodiment, a first sealing ring 21 is provided between the display 19 and the thread end face 122a of the first external thread 122. During the screwing process of the first external thread 122 and the first internal thread 151, the first sealing ring 21 and the display 19 can be simultaneously pressed against the bottom wall of the cover 15 to simplify the structural setting and the assembly process.

[0060] Specifically, the display 19 includes a display main board 191, a panel 192, and a panel film 193 that are sequentially connected in the first direction. The display main board 191, the panel 192, and the panel film 193 are connected by a threaded fastener that penetrates through all three of them simultaneously to form an integral body. The display main board 191 is electrically connected to the transmitter main board 16 and is the core component of the display 19, including a liquid crystal display screen for displaying the density value of the gas to be detected. Specifically, the electrical connection between the display main board 191 and the transmitter main board 16 can be a direct connection or an indirect connection (for example, connected through a relay main board 18), which can be selected according to the convenience of the wiring. The panel 192 is a support and installation component of the display 19, and it has an outer diameter equal to the inner diameter of the cover 15. The thread end face 122a of the first external thread 122 presses the display 19 against the cover 15 by pressing the panel 192. The panel film 193 is arranged on the outermost side of the display 19 and can protect the liquid crystal display screen.

[0061] Reference Figure 4a and Figure 4b , in this embodiment, the monitoring device 1 integrates the transmitter main board 16, the relay main board 18, and the display 19 at the same time. Among them, the transmitter main board 16 is electrically connected to the relay main board 18, and the relay main board 18 is electrically connected to the display main board 191. The installation method of the transmitter main board 16 can refer to Figure 2a and Figure 2b The shown structure, and the installation method of the display 19 can refer to Figure 3a and Figure 3b The shown method.

[0062] When the monitoring device 1 integrates more functional modules, it is necessary to Figure 1a and Figure 1b expand the installation space shown. The method adopted in this embodiment is to add an adapter cover 33, that is, the watch case 12 is connected to the cover 15 through the adapter cover 33. That is, the watch case 12 and the adapter cover 33 are connected by threads, and the adapter cover 33 and the cover 15 are connected by threads. The specific connection method continues Figure 1a and Figure 1b the connection method between the watch case 12 and the cover 15 in. The left side of the adapter cover 33 has an external thread to facilitate the screwing of the first internal thread 151 of the cover 15; the right side of the adapter cover 33 has an internal thread (second internal thread 331) to be screwed with the first external thread 122 of the watch case 12.

[0063] In this embodiment, a second sealing ring 22 is provided between the watch case 12 and the adapter cover 33. The installation method of the second internal thread 331 is similar to that of the first internal thread 151. Specifically: an annular rib is provided on the inner wall of the adapter cover 33, and the annular rib is located downstream of the second internal thread 331 in the first direction. During the screwing process of the first external thread 122 and the second internal thread 331, the thread end face 122a of the first external thread 122 presses the second sealing ring 22 against the annular rib to achieve the seal between the watch case 12 and the adapter cover 33.

[0064] A sealing ring can also be provided between the adapter cover 33 and the cover 15. The specific setting method can refer to Figure 1a and Figure 1b the connection method between the second end 12b of the watch case 12 and the cover 15 in, and will not be elaborated here.

[0065] In addition, a 485 remote transmission module is provided on the transmitter main board 16 to realize the remote communication of the monitoring device 1.

[0066] To sum up, all parts of this embodiment adopt a standardized detachable connection structure, which can conveniently realize the expansion and deletion between functional modules to meet the diverse needs of customers. For example, when the customer hopes that all data is processed remotely, the structure shown in Figure 1a and Figure 1b can be selected; when the customer hopes to obtain a warning signal in time, the relay main board 18 can be expanded on the basis of Figure 1a and Figure 1b , that is, the structure shown in Figure 2a and Figure 2b ; when the customer hopes to conveniently know the real-time density value of the gas to be detected locally on the monitoring device 1, the display 19 can be expanded on the basis of Figure 1a and Figure 1b , that is, the structure shown in Figure 3a and Figure 3bstructure; when the customer hopes that the functions of the monitoring module are relatively comprehensive, the monitoring device 1 can be expanded to be Figure 4a and Figure 4b the structure shown.

[0067] Preferably, in this embodiment, each threaded fastener (including bolts, single-headed through studs, etc.) can be set to the same thread model, further improving the interchangeability between components and the convenience of assembly.

[0068] In summary, the above embodiments provided by the present invention only illustratively explain the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A gas density monitoring device, characterized in that, Comprising: A detection unit, including an adapter and a temperature and pressure sensor disposed inside the adapter, and the adapter can be communicated with the gas to be detected; A watch case, having a first end and a second end in the axial direction, the watch case is a cylindrical structure with an opening provided at the second end, and the detection unit is mounted outside the watch case through the end panel at the first end; A mounting bracket, disposed inside the watch case and connected to the end panel, and a first threaded hole is provided on the mounting bracket; A transmitter main board, electrically connected to the temperature and pressure sensor, the mounting bracket and the transmitter main board are sequentially connected along a first direction, and the first direction is parallel to the axial direction and points from the first end to the second end; the transmitter main board has a second threaded hole with the same diameter as the first threaded hole and axially aligned with the first threaded hole, so that the transmitter main board and the mounting bracket are connected by threads; the second threaded hole is also used to connect with other electronic components, so that the transmitter main board and the other electronic components are connected by threads; A cover, detachably connected to the second end of the watch case to close the opening; A cable, disposed outside the watch case and electrically connected to the transmitter main board; The watch case and the cover are connected by threads, wherein the watch case has a first external thread and the cover has a first internal thread; A first sealing ring is provided between the watch case and the cover, and during the screwing process of the first external thread and the first internal thread, the first sealing ring can be pressed against the bottom wall of the cover by the threaded end face of the first external thread; The outer peripheral surface of the first sealing ring is in the shape of a stepped shaft, the small diameter portion of the outer peripheral surface fits with the inner surface of the watch case, and the large diameter portion of the outer peripheral surface fits with the inner surface of the cover; An inner cavity extending along the axial direction is provided inside the adapter, and the size of the inner cavity matches the outer shape of the temperature and pressure sensor, so that the temperature and pressure sensor is embedded in the inner cavity, and one axial end of the temperature and pressure sensor abuts against the end panel; The adapter has a fitting surface that fits with the end panel of the watch case, and a threaded blind hole is provided on the fitting surface, and the adapter and the end panel of the watch case are connected by an assembly bolt screwed into the threaded blind hole; The signal line of the temperature and pressure sensor penetrates into the inside of the watch case through a wire passing hole provided on the end panel; The other axial end of the temperature and pressure sensor is connected to the bottom wall of the inner cavity through a third sealing ring, and the extending direction of the assembly bolt is parallel to the axial direction. When the assembly bolt is screwed, the third sealing ring can be compressed by the temperature and pressure sensor; An annular groove is provided in the middle of the axial side of the temperature and pressure sensor, and a fourth sealing ring for sealing the side of the temperature and pressure sensor and the side wall of the inner cavity is provided in the annular groove; One end of the inner cavity facing the watch case has an opening, a chamfer is provided at the opening, and a fifth sealing ring is provided in the annular cavity formed by the chamfer, the temperature and pressure sensor, and the end panel at the first end.

2. The gas density monitoring device according to claim 1, wherein The mounting bracket includes a first single-headed through stud and a mounting plate connected in sequence along the first direction, and the screw part of the first single-headed through stud is screwed with the watch case; The head of the first single-headed through stud abuts against the mounting plate, and a counterbore is provided on the mounting plate. The mounting plate is screwed with the head of the first single-headed through stud through a bolt in the counterbore.

3. The gas density monitoring device according to claim 1, characterized in that, It further includes a relay main board electrically connected to the transmitter main board. The relay main board is located downstream of the transmitter main board along the first direction. The relay main board has a third threaded hole with the same diameter as the second threaded hole and axially aligned with the second threaded hole, so that the relay main board and the transmitter main board are mechanically connected by threads.

4. The gas density monitoring device according to claim 3, characterized in that, The relay main board and the transmitter main board are connected by a second single-headed through stud, and the screw part of the second single-headed through stud is simultaneously screwed with the first threaded hole and the second threaded hole; The head of the second single-headed through stud abuts against the side of the relay main board facing the transmitter main board, and the relay main board is screwed with the head of the second single-headed through stud through a bolt in the third threaded hole.

5. The gas density monitoring device according to claim 1, wherein The end face of the cover has an observation hole, and the monitoring device further includes a display for externally displaying the density value of the gas to be detected through the observation hole; The maximum outer diameter of the display is equal to the inner diameter of the cover. During the screwing process of the first external thread and the first internal thread, the display can be pressed against the bottom wall of the cover by the threaded end face of the first external thread.

6. The gas density monitoring device according to claim 5, characterized in that, A first sealing ring is further provided between the display and the threaded end face of the first external thread. During the screwing process of the first external thread and the first internal thread, the first sealing ring and the display can be simultaneously pressed against the bottom wall of the cover.

7. The gas density monitoring device according to claim 5, characterized in that, The display includes a display main board, a panel, and a panel film connected in sequence along the first direction, and the three are connected by a threaded fastener that penetrates through the three at the same time; among them, the display main board is electrically connected to the transmitter main board; The threaded end face of the first external thread presses the display against the cover by pressing the panel.

8. The gas density monitoring device according to claim 1, wherein The watch case is connected to the cover through an adapter cover, and both axial ends of the adapter cover are provided with openings; The watch case and the adapter cover, and the adapter cover and the cover are both connected by threads; The monitoring device includes a relay main board electrically connected to the transmitter main board, and a display main board electrically connected to the relay main board.

9. The gas density monitoring device according to claim 8, wherein One end of the adapter cover close to the watch case has a second internal thread, and an annular convex rib is provided on the inner wall of the adapter cover. The annular convex rib is located downstream of the second internal thread along the first direction; A second sealing ring is provided between the watch case and the adapter cover. During the screwing process of the first external thread and the second internal thread, the second sealing ring can be pressed against the annular convex rib by the threaded end face of the first external thread.

10. The gas density monitoring device according to claim 1, characterized in that, A sixth sealing ring is provided between the joint surface and the end panel, and the sixth sealing ring is located radially outside the threaded blind hole.

11. The gas density monitoring device according to claim 1, characterized in that The watch case includes a retaining ring disposed on the inner surface of the end panel, and the assembly bolt sequentially passes through the retaining ring and the end panel to be screwed with the threaded blind hole; the mounting bracket is threadedly connected to the retaining ring.

12. The gas density monitoring device according to claim 1, wherein The main board of the transmitter has a 485 remote transmission module.

13. The gas density monitoring device according to claim 1, characterized in that The gas to be detected is SF6 gas.

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