Pressure detection device

Abstract

The utility model provides a pressure detection device, and relates to the technical field of pressure detection. The pressure detection device comprises an interface piece, a switch piece and a pressure piece. A hollow cavity is formed in the interface piece, and the switch piece is fixed in the hollow cavity; the interface piece is provided with a test cavity communicated with the hollow cavity, and the open end of the test cavity is connected with external equipment to be tested; the pressure piece comprises a diaphragm box composed of a plurality of elastic diaphragms, the diaphragm box is provided with an opening corresponding to the test cavity, the opening is fixedly communicated with the test cavity through a connecting piece, and the pressure piece is located between the test cavity and the switch piece; wherein the pressure piece is used for generating a contact state or a non-contact state with the switch piece based on the pressure condition of the test cavity; the switching element is used for generating a switching signal based on a contact state or a non-contact state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure detection, in particular to a pressure detection device. BACKGROUND

[0002] Micro switch is a kind of switch with small contact spacing and fast action mechanism, which can perform switching action with specified stroke and specified force, and is covered by a shell, and has a driving presser outside. The contact spacing of the switch is relatively small, and the switch is widely used in automatic control and safety protection scenes of devices requiring frequent switching of circuits, such as semiconductor devices, analytical instruments, electronic devices, power systems, electrical devices, and aerospace, aviation, and ship fields.

[0003] In the prior art, micro switches are usually used to detect the pressure conditions of various devices, for example, a pressure transmission shaft is combined with a micro switch for detection. However, the current pressure switch has low sensitivity and low precision, which leads to poor effect of pressure detection of the device and cannot meet the current detection requirements. CONTENT OF THE INVENTION

[0004] Therefore, the purpose of the embodiments of the present application is to provide a pressure detection device to improve the problem of poor pressure detection effect in the prior art.

[0005] To solve the above problems, the pressure detection device provided by the embodiments of the present application comprises an interface piece, a switch piece and a pressure piece.

[0006] The interface piece is provided with a hollow cavity, and the switch piece is fixed in the hollow cavity.

[0007] The interface piece is provided with a test cavity communicating with the hollow cavity, and the opening end of the test cavity is connected with an external device to be detected.

[0008] The pressure piece comprises a diaphragm box composed of a plurality of elastic diaphragms, the diaphragm box has an opening corresponding to the test cavity, the opening is fixedly communicated with the test cavity through a connecting piece, and the pressure piece is between the test cavity and the switch piece.

[0009] The pressure piece is used to generate a contact state or a non-contact state with the switch piece based on the pressure condition of the test cavity, and the switch piece is used to generate a switch signal based on the contact state or the non-contact state.

[0010] In the implementation process, a hollow cavity is arranged in the interface piece to accommodate the fixed switch piece and the pressure piece, and in order to effectively improve the accuracy and effectiveness of triggering the switch piece, the pressure piece can be arranged in the structure of a diaphragm box composed of multiple diaphragms, and the opening of the diaphragm box is fixedly communicated with a test cavity connected to an external device to be tested through a connecting piece, so that the measured substance in the test cavity can enter the diaphragm box, and the diaphragm box can be deformed according to the actual pressure of the measured substance, thereby generating a contact state or a non-contact state with the switch piece, and generating a corresponding switch signal. The actual triggering of the switch piece can be controlled by the deformation of the pressure piece, without the need to set a transmission shaft and other structures to control the switch piece, thereby effectively improving the sensitivity of the switch, and improving the accuracy and effectiveness of detecting the pressure of the device to be tested. It is suitable for various pressure detection scenes and meets various pressure detection needs.

[0011] Optionally, the diaphragm box comprises a first diaphragm and a second diaphragm.

[0012] The first diaphragm and the second diaphragm are connected to form the diaphragm box.

[0013] The first diaphragm is arranged close to the test cavity, and the second diaphragm is arranged close to the switch piece.

[0014] The opening is arranged on the first diaphragm, and the second diaphragm is used to generate the contact state or the non-contact state with the switch piece.

[0015] In the implementation process, two diaphragms can be arranged in the diaphragm box, the first diaphragm is arranged close to the test cavity, and the second diaphragm is arranged close to the switch piece, and the diaphragm box is formed by connecting the two diaphragms. In order to achieve the corresponding deformation and switch control effect, an opening is arranged on the first diaphragm close to the test cavity, and the opening is connected with the test cavity, so that the measured substance can enter the diaphragm box to deform according to the pressure of the test cavity, and the second diaphragm close to the switch piece generates a corresponding contact state or non-contact state with the switch piece. The diaphragm box can be fixed on the test cavity through the opening arranged on the diaphragm, which reduces the difficulty of fixing the pressure piece in the hollow cavity, and the diaphragm box based on the pressure in the test cavity generates a corresponding deformation, thereby effectively improving the accuracy and effectiveness of the switch control of the switch piece by the pressure piece.

[0016] Optionally, the switch piece comprises a switch body and a contact end.

[0017] The switch body is provided with a through hole for accommodating the movement of the contact end.

[0018] The contact end is movably fixed in the through hole.

[0019] In the implementation process, the switch member can include a switch body generating a signal and a contact end generating a contact state or a non-contact state with the pressure member. The switch body is provided with a corresponding through hole, and the contact end is movably fixed in the through hole. The contact end can change its position based on the position of the pressure member, so as to change the actual position of the contact end through the deformation of the pressure member, thereby generating a corresponding contact state or non-contact state, effectively improving the accuracy and effectiveness of the switch member triggering.

[0020] Optionally, in the movement direction of the contact end, in the non-contact state, the height difference between the inner edge portion surrounding the through hole and the contact point of the contact end on the contact surface of the switch body close to the pressure member is h1; and in the full contact state, the inner edge portion is flush with the contact point in height.

[0021] In the non-contact state, the height difference between the outer edge portion of the contact surface excluding the inner edge portion and the contact point is h2, and h2>h1.

[0022] In the implementation process, in the movement direction of the contact end driven by the pressure member to generate movement, in the non-contact state, the height difference between the inner edge portion surrounding the through hole and the contact point of the contact end in the free state on the contact surface of the switch body close to the pressure member is h1, the height difference between the outer edge portion of the contact surface excluding the inner edge portion and the contact point of the contact end in the free state is h2, and h2>h1, that is, the inner edge portion is a relatively convex boss structure relative to the outer edge portion, so as to abut against the deformed pressure member through the convex inner edge portion, thereby reducing the damage to the diaphragm caused by the contact of the contact end with the diaphragm. In the full contact state of the contact end and the pressure member, that is, in the case that the contact end completely enters the through hole, the inner edge portion and the contact point are flush in height in the movement direction, further reducing the damage to the contacted diaphragm caused by the contact end outside the through hole in the full contact state. By setting the boss structure and limiting the height, the diaphragm of the pressure member is protected, effectively improving the accuracy and effectiveness of the pressure member in switching control of the switch member, and prolonging the service life of the pressure member.

[0023] Optionally, the inner wall of the hollow cavity and the outer wall of the switch member are provided with threads.

[0024] The switch member is adjustably fixed in the hollow cavity through the threads.

[0025] In the implementation process, the inner wall of the hollow cavity and the outer part of the switch piece can be provided with threads, the switch piece can be fixed in the hollow cavity through the threads, and the fixed position of the switch piece can be adjusted according to actual pressure detection requirements, so that the switch piece can be adjusted to adapt to different pressure triggering conditions for detection, thereby enabling the pressure detection device to be applicable to different types of pressure detection scenes.

[0026] Optionally, the device further comprises a fixing piece.

[0027] The fixing piece is used to tightly arrange the switch piece on the inner wall of the hollow cavity.

[0028] In the implementation process, when the switch piece is fixed in the hollow cavity, due to the gap between the threads, the switch piece may be loose in the test scene due to movement and other conditions, thereby affecting the accuracy and effectiveness of the switch signal. Therefore, a detachable fixing piece can be provided to tightly arrange the switch piece on the inner wall of the hollow cavity through the fixing piece, thereby effectively reducing the looseness of the switch piece after being fixed, improving the stability of the fixed switch piece, and further improving the accuracy and effectiveness of the switch signal.

[0029] Optionally, the device further comprises a signal output piece.

[0030] The signal output piece is electrically connected to the switch piece through a connecting line.

[0031] The signal output piece is used to transmit the switch signal.

[0032] In the implementation process, in order to transmit the switch signal, the pressure detection device can further comprise a signal output piece electrically connected to the switch piece through a connecting line to obtain the switch signal generated by the switch piece and transmit the switch signal. The switch signal is transmitted to an external display screen or other equipment for display or processing, so that the user can process or view the pressure detection result.

[0033] Optionally, the non-contact surface of the switch piece is connected to the connecting line.

[0034] The non-contact surface is provided with a sealing piece.

[0035] In the implementation process, in order to ensure the cleanliness of the hollow cavity of the interface piece and reduce the adverse effects of dust and other impurities entering the hollow cavity on the multiple devices or inner wall therein, a corresponding sealing piece can be provided on the non-contact surface of the switch piece connected to the connecting line to seal the hollow cavity, thereby effectively improving the stability of each device in the hollow cavity during operation.

[0036] Optionally, the device further comprises a housing structure.

[0037] The housing structure is sleeved on the opposite end of the test cavity on the interface piece.

[0038] In the implementation process, a corresponding housing structure can also be provided, which is sleeved on the opposite end of the test cavity on the interface piece, so as to protect the interface piece and the device in the interface piece through the housing structure, and facilitate the user to use the pressure detection device.

[0039] Optionally, a corrosion-resistant coating is arranged on the inner wall of the interface piece.

[0040] The constituting material of the pressure piece includes corrosion-resistant material.

[0041] In the implementation process, considering that the measured substance in the device to be measured may be a corrosive gas, a corrosion-resistant coating can be arranged on the inner wall of the interface piece, and the pressure piece can be made of multiple types of corrosion-resistant materials, so as to reduce the adverse effects of corrosive gas on the interface piece and the pressure piece, effectively improve the stability of the pressure detection device during work, and prolong the service life of the pressure detection device.

[0042] In summary, the embodiment of the present application provides a pressure detection device, which can control the actual triggering of the switch piece through the deformation of the pressure piece, without the need to set a transmission shaft or other structure to control the switch piece, effectively improving the sensitivity of the switch, thereby improving the accuracy and effectiveness of detecting the pressure condition of the device to be measured, and being suitable for various pressure detection scenes and meeting various pressure detection requirements. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0044] Figure 1 A structural schematic diagram of a pressure detection device provided by the embodiment of the present application;

[0045] Figure 2 A specific structural schematic diagram of a pressure detection device provided by the embodiment of the present application;

[0046] Figure 3 A partial cross-sectional structural schematic diagram of a switch piece provided by the embodiment of the present application.

[0047] Icon: 100 - interface piece; 110 - hollow cavity; 120 - test cavity; 200 - switch piece; 210 - switch body; 211 - through hole; 220 - contact end; 221 - contact point; 230 - fixing piece; 240 - sealing piece; 300 - pressure piece; 301 - opening; 310 - first diaphragm; 320 - second diaphragm; 400 - connecting piece; 500 - signal output piece; 510 - connecting line; A - movement direction; B - inner edge portion; C - outer edge portion. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0049] At present, in order to detect the pressure condition of various devices, a pressure transmission shaft combined with a micro switch is usually used for detection. However, the sensitivity of such a pressure switch is low, and the precision is not high, which leads to poor effect of pressure detection of the device, and cannot meet the current detection requirements.

[0050] In order to solve the above problems, the present application provides a pressure detection device. The pressure detection device can be communicatively connected with various types of electronic devices, such as servers, personal computers (PCs), tablet computers, smart phones, personal digital assistants (PDAs) and other electronic devices with logic computing functions. The pressure detection device can transmit the generated switch signal to the electronic device, process the switch signal, and provide the user with the pressure detection result for viewing and understanding.

[0051] Referring to Figure 1 , Figure 1 A structure diagram of a pressure detection device provided by the present application is shown. The pressure detection device can include an interface piece 100, a switch piece 200 and a pressure piece 300.

[0052] The interface piece 100 is provided with a hollow cavity 110, and the switch piece 200 is fixed in the hollow cavity 110. The interface piece 100 can be provided as a hollow joint or the like structure, the switch piece 200 can be provided as a micro switch of various types, such as a micro switch with a three-way characteristic, and the pressure piece 300 can be provided as a diaphragm structure with elastic deformation function or the like.

[0053] It should be noted that the interface piece 100 is provided with a test cavity 120 communicating with the hollow cavity 110, and the opening 301 of the test cavity 120 is connected with an external device to be tested. In order to effectively improve the accuracy and effectiveness of the trigger switch piece 200, the pressure piece 300 can include a diaphragm box composed of multiple elastic diaphragms, and the diaphragm box has an opening 301 corresponding to the test cavity 120. The opening 301 is fixedly communicated with the test cavity 120 through the connecting piece 400, and the pressure piece 300 is between the test cavity 120 and the switch piece 200.

[0054] Optionally, the opening 301 of the test cavity 120 can be connected with a test port of the device to be tested, so that the measured substance in the test cavity 120 can be inside the test cavity 120 and the diaphragm box connected with the test cavity 120. The device to be tested can be various devices that need to be pressure detected, such as semiconductor devices with vacuum cavities, etc., and the measured substance can be various types of gas substances in the device to be tested.

[0055] Optionally, the opening 301 of the test cavity 120 can be connected with a test port of the device to be tested, so that the measured substance in the test cavity 120 can be inside the test cavity 120 and the diaphragm box connected with the test cavity 120. The device to be tested can be various devices that need to be pressure detected, such as semiconductor devices with vacuum cavities, etc., and the measured substance can be various types of gas substances in the device to be tested.

[0056] Optionally, the switch signal can include an opening signal and a closing signal. Taking a microswitch with a three-way characteristic as an example, the switch piece 200 can include three ports, i.e. a common port (COM port), a normally open port (NO port) and a normally closed port (NC port). The connection between the multiple ports can be controlled according to the contact state and the non-contact state, so as to output the corresponding switch signal. The port connection conditions corresponding to the opening signal and the closing signal can also be set and modified according to actual conditions. For example, in the scene of detecting positive pressure, the pressure piece 300 generates expansion deformation, in the contact state, the normally open port and the common port are connected to generate the opening signal, and in the non-contact state, the normally closed port and the common port are connected to generate the closing signal. In the scene of detecting negative pressure, the pressure piece 300 generates compression deformation, in the contact state, the normally closed port and the common port are connected to generate the opening signal, and in the non-contact state, the normally open port and the common port are connected to generate the closing signal, etc.

[0057] In Figure 1In the embodiment shown, the actual triggering of the switch piece 200 can be controlled by the deformation of the pressure piece 300, and there is no need to set a transmission shaft or other structure to control the switch piece 200, effectively improving the sensitivity of the switch, thereby improving the accuracy and effectiveness of detecting the pressure condition of the device to be tested, and being suitable for various pressure detection scenarios and meeting various pressure detection needs.

[0058] Optionally, referring to Figure 2 , Figure 2 A specific structural diagram of a pressure detection device provided by the embodiment of the present application is shown, wherein the diaphragm box can include a first diaphragm 310 and a second diaphragm 320, and the first diaphragm 310 is connected with the second diaphragm 320 to form a diaphragm box.

[0059] It should be noted that the first diaphragm 310 is arranged close to the test cavity 120, and the second diaphragm 320 is arranged close to the switch piece 200. The first diaphragm 310 is provided with an opening 301, and the second diaphragm 320 is used to generate a contact state or a non-contact state with the switch piece 200. Two diaphragms can be arranged in the diaphragm box, the first diaphragm 310 is arranged close to the test cavity 120, and the second diaphragm 320 is arranged close to the switch piece 200, and the diaphragm box is formed by connecting the two diaphragms. In order to achieve the corresponding deformation and switch control effect, the first diaphragm 310 close to the test cavity 120 is provided with an opening 301, which is connected with the test cavity 120, so that the inside of the diaphragm box can enter the measured substance to deform according to the pressure condition of the test cavity 120, and the second diaphragm 320 close to the switch piece 200 generates a corresponding contact state or non-contact state with the switch piece 200. The diaphragm box can be fixed on the test cavity 120 through the opening 301 arranged on the diaphragm, which reduces the difficulty of fixing the pressure piece 300 in the hollow cavity 110, and the pressure piece 300 based on the pressure condition in the test cavity 120 generates a corresponding deformation, effectively improving the accuracy and effectiveness of the switch control of the switch piece 200 by the pressure piece 300.

[0060] For example, the first diaphragm 310 and the second diaphragm 320 can be connected by welding to reduce the adverse conditions such as gas leakage of the formed diaphragm box, and at the same time improve the deformation accuracy of the diaphragm box, and also reduce the corrosion of the corrosive gas into the hollow cavity 110 of the interface piece 100 to cause corrosion to the switch piece 200 and other devices.

[0061] Optionally, the connecting piece 400 connecting the first diaphragm 310 and the test cavity 120 can be provided as a corresponding diaphragm support tube or the like structure, the first end of the diaphragm support tube can be welded with the cavity opening of the test cavity 120, and the second end of the diaphragm support tube can be connected with the edge of the opening 301 on the first diaphragm 310, so as to reduce the medium pollution in the diaphragm and the test cavity 120 by means of the overall welding connection mode. The shape and size of the opening 301 on the first diaphragm 310 can correspond to the cavity opening of the test cavity 120.

[0062] Optionally, during the test, the hollow cavity 110 can be in a regular atmospheric pressure or a corresponding level of vacuum pressure, which can be set according to the actual pressure detection requirement.

[0063] It should be noted that, considering that the measured substance in the device to be tested can be a corrosive gas, therefore, a corrosion-resistant coating can be provided on the inner wall of the interface piece 100, for example, a corrosion-resistant coating is provided on the inner wall of the test cavity 120, and the constituting material of the pressure piece 300 can include a corrosion-resistant material.

[0064] Optionally, the corrosion-resistant coating can be a chromium-rich layer or the like coating, so as to improve the corrosion resistance of the interface piece 100 to the corrosive gas, and reduce the adhesion of particles on the inner wall surface of the test cavity 120, thereby reducing the adverse effects of the substance adhering to the inner wall of the test cavity 120 on the pressure detection. The corrosion-resistant material can be a metal material having corrosion resistance and elastic deformation function, for example, 316L stainless steel material or the like.

[0065] Optionally, please refer to Figure 3 , Figure 3 A partial cross-sectional structure schematic diagram of a switch piece provided by the embodiment of the present application, wherein the switch piece 200 can include a switch body 210 and a contact end 220, the switch body 210 is provided with a through hole 211 accommodating the movement of the contact end 220, and the contact end 220 is movably fixed in the through hole 211. The switch piece 200 can include a switch body 210 generating a signal and a contact end 220 generating a contact state or a non-contact state with the pressure piece 300. The switch body 210 is provided with a corresponding through hole 211, the contact end 220 is movably fixed in the through hole 211, and the contact end 220 can change its position based on the position of the pressure piece 300, so as to change the actual position of the contact end 220 by the deformation of the pressure piece 300, thereby generating a corresponding contact state or non-contact state, effectively improving the precision and effectiveness of the triggering of the switch piece 200.

[0066] For example, the contact end 220 can be a body structure with multiple connection ports through the switch body 210. The contact end 220 can be provided with a structure that can be pressed and stretched. The contact end 220 can include a movement structure with stretching and elastic functions such as a movement shaft, so as to control the connection of different connection ports through the actual position of the contact end 220 to generate corresponding switch signals.

[0067] It should be noted that in the high-pressure test scenario of positive pressure, the diaphragm box generates a large expansion deformation due to the high pressure in the test cavity 120, thereby being in complete contact with the contact end 220. Due to the height difference between the contact end 220 and the contact surface, in the complete contact state, the diaphragm may be irreversibly deformed due to the protruding contact end 220, thereby affecting the accuracy and effectiveness of subsequent pressure detection. Therefore, in order to reduce this adverse situation, in the movement direction A of the contact end 220, in the non-contact state, the inner edge portion B surrounding the through hole 211 of the switch body 210 close to the contact surface of the pressure element 300 has a height difference h1 with the contact point 221 of the contact end 220; in the complete contact state, the inner edge portion B is flush with the contact point 221. In the non-contact state, the outer edge portion C of the contact surface, except the inner edge portion B, has a height difference h2 with the contact point 221, h2>h1.

[0068] Optionally, the contact point 221 of the contact end 220, i.e. the end of the contact end 220 close to the pressure element 300, can be provided with a contact point 221 made of metal or other materials. The contact point 221 can also be provided with a relatively smooth structure, such as a spherical structure, to reduce damage to the pressure element 300 caused by sharp structures.

[0069] In the movement direction A in which the contact end 220 is driven to move by the pressure piece 300, in the non-contact state, the inner edge portion B surrounding the through hole 211 on the contact surface of the switch body 210 close to the pressure piece 300 has a height difference h1 with the contact point 221 of the contact end 220 in the free state, and the outer edge portion C on the contact surface has a height difference h2 with the contact point 221 of the contact end 220 in the free state, h2>h1, that is, the inner edge portion B is a relatively convex boss structure relative to the outer edge portion C, so that the convex inner edge portion B abuts against the deformed pressure piece 300, thereby reducing the damage to the diaphragm caused by the contact of the contact end 220 with the diaphragm. Moreover, in the case where the contact end 220 is in full contact with the pressure piece 300, that is, the contact end 220 completely enters the through hole 211, the inner edge portion B and the contact point 221 are flush in the movement direction A, further reducing the damage to the contacted diaphragm caused by the contact end 220 outside the through hole 211 in the full contact state. By setting the boss structure and the limited height, the diaphragm of the pressure piece 300 is protected, the accuracy and effectiveness of the switch control of the switch piece 200 by the pressure piece 300 are effectively improved, and the service life of the pressure piece 300 is prolonged.

[0070] Optionally, the size and shape of the inner edge portion B and the outer edge portion C can be set according to actual conditions and requirements, for example, the inner edge portion B is set to a circular ring shape, etc.

[0071] Optionally, the inner wall of the hollow cavity 110 and the outer wall of the switch piece 200 are provided with threads, and the switch piece 200 is adjustably fixed in the hollow cavity 110 through the threads. The inner wall of the hollow cavity 110 and the outer wall of the switch piece 200 can be provided with threads, and the switch piece 200 can be fixed in the hollow cavity 110 through the threads, and the fixed position of the switch piece 200 can be adjusted according to actual pressure detection requirements, so as to adapt to various pressure triggering conditions for detection by adjusting the fixed position of the switch piece 200, thereby enabling the pressure detection device to be applicable to various types of pressure detection scenes.

[0072] For example, the switch piece 200 can be fixed at different height positions in the movement direction A by rotating the switch piece 200.

[0073] It should be noted that considering that when the switch piece 200 is fixed in the hollow cavity 110, due to the gap between the threads, the switch piece 200 may be loose in the test scene due to movement, etc., thereby affecting the accuracy and effectiveness of the switch signal, therefore, the pressure detection device can further include a fixing piece 230, the fixing piece 230 is used to tightly arrange the switch piece 200 on the inner wall of the hollow cavity 110.

[0074] For example, the fixing member 230 can be a screw, a nut, a buckle, a gasket, or the like, which has a fixing function. The fixing member 230 is arranged in a detachable structure, so as to fasten the switch member 200 on the inner wall of the hollow cavity 110 through the fixing member 230, thereby effectively reducing the looseness of the switch member 200 after being fixed, improving the stability of the switch member 200 during fixing, and further improving the accuracy and effectiveness of the switch signal.

[0075] Optionally, please continue to refer to Figure 2 In order to transmit the switch signal, the pressure detection device can further include a signal output member 500, which is electrically connected to the switch member 200 through a connecting line 510, and is used for transmitting the switch signal. The signal output member 500 is electrically connected to the switch member 200 through the connecting line 510, so as to obtain the switch signal generated by the switch member 200 and transmit the switch signal to an external device.

[0076] It should be noted that the signal transmission member 500 can be arranged as a plurality of types of signal transmission connectors, such as a DB9 male connector, and the like. The signal transmission member 500 can be connected to the external device to transmit the switch signal to the external device for display or processing. The external device can include a display screen, a digital pressure display table, or the like, to display the corresponding pressure detection result, so that the user can process or view the pressure detection result.

[0077] For example, the connecting line 510 can be one or more wires of various types to achieve the signal transmission function.

[0078] Optionally, according to different pressure detection scenarios, the positive pressure and negative pressure parameters of the diaphragm capsule and the switch member 200 can be adjusted according to the expansion and contraction of the diaphragm capsule. For example, in a positive pressure test scenario, the diaphragm capsule expands, and the digital pressure display table connected to the switch member 200 can be adjusted to trigger the micro switch to close relative to the positive pressure value, so as to output an opening signal to obtain the corresponding positive pressure value as the pressure detection result. In a negative pressure test scenario, the diaphragm capsule contracts, and the digital pressure display table connected to the switch member 200 can be adjusted to trigger the micro switch to open relative to the negative pressure value, so as to output a closing signal to obtain the corresponding negative pressure value as the pressure detection result, and the like.

[0079] Optionally, the switch signal with a numerical value can also be generated according to the movement stroke of the contact end 220, so as to be analyzed by the signal output member 500 or the connected external device, to obtain the pressure detection result with the actual pressure value.

[0080] Optionally, please continue to refer to Figure 2The non-contact surface of the switch piece 200 is connected with the connecting line 510. In order to ensure the cleanliness of the hollow cavity 110 of the interface piece 100 and reduce the adverse effects of dust and other impurities entering the hollow cavity 110 on the devices or inner walls in the hollow cavity 110, the non-contact surface of the switch piece 200 is provided with a sealing piece 240. By providing the sealing piece 240 on the non-contact surface of the switch piece 200 connected with the connecting line 510, the hollow cavity 110 is sealed, effectively improving the stability of the devices in the hollow cavity 110 during operation.

[0081] Optionally, the sealing piece 240 can also be arranged on the opening surface of the hollow cavity 110.

[0082] For example, the sealing piece 240 can include a corresponding metal ring, sintered glass, sealant, and other sealing structures. The sealing piece 240 can be detached to adjust the position of the switch piece 200 for various pressure detection scenarios.

[0083] Optionally, the pressure detection device can further include a shell structure arranged on the opposite end of the interface piece 100 corresponding to the test cavity 120. The shell structure can be arranged on the opposite end of the interface piece 100 corresponding to the test cavity 120 to protect the interface piece 100 and the devices in the interface piece 100 by the shell structure, and facilitate the user to use the pressure detection device.

[0084] For example, according to the application scenario and cost requirements of the pressure detection device, a corresponding material can be selected as the constituting material of the shell structure. For example, a metal material that is not easy to deform can be used to manufacture the shell structure to reduce the adverse effects of deformation during use.

[0085] In addition, the parts in each embodiment of the present application can be integrated together to form an independent part, or each part can exist independently, or two or more parts can be integrated to form an independent part.

[0086] The above is only an embodiment of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0087] The above describes only the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application.

[0088] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A pressure detecting device characterized by comprising: The device comprises an interface piece, a switch piece and a pressure piece; A hollow cavity is arranged in the interface piece, and the switch piece is fixed in the hollow cavity; A test cavity communicating with the hollow cavity is arranged on the interface piece, and an opening end of the test cavity is connected with an external device to be tested; The pressure piece comprises a diaphragm box composed of multiple elastic diaphragms, and the diaphragm box has an opening corresponding to the test cavity, the opening is fixedly communicated with the test cavity through a connecting piece, and the pressure piece is between the test cavity and the switch piece; The pressure piece is used to generate a contact state or a non-contact state with the switch piece based on the pressure condition of the test cavity; and the switch piece is used to generate a switch signal based on the contact state or the non-contact state.

2. The apparatus of claim 1, wherein, The diaphragm box comprises a first diaphragm and a second diaphragm; The first diaphragm and the second diaphragm are connected to form the diaphragm box; The first diaphragm is arranged close to the test cavity, and the second diaphragm is arranged close to the switch piece; The opening is arranged on the first diaphragm, and the second diaphragm is used to generate the contact state or the non-contact state with the switch piece. The switch piece comprises a switch body and a contact end; 3. The apparatus of claim 1, wherein, A through hole is arranged on the switch body to accommodate movement of the contact end; The contact end is movably fixed in the through hole. In the movement direction of the contact end, in the non-contact state, the inner edge portion surrounding the through hole on the contact surface close to the pressure piece has a height difference h1 with the contact point of the contact end; and in the full contact state, the inner edge portion is flush with the contact point in height. In the non-contact state, the height difference between the outer edge portion on the contact surface and the contact point is h2, and h2>h1.

4. The apparatus of claim 3, wherein, The inner wall of the hollow cavity and the outer wall of the switch piece are provided with threads; The switch piece is adjustably fixed in the hollow cavity through the threads. The device further comprises a fixing piece; 5. The apparatus of any one of claims 1-4, wherein, The fixing piece is used to tightly arrange the switch piece on the inner wall of the hollow cavity. The device further comprises a signal output piece; The signal output piece is electrically connected with the switch piece through a connecting line; 6. The apparatus of claim 5, wherein, The signal output piece is used to transmit the switch signal. The non-contact surface of the switch piece is connected with the connecting line; A sealing piece is arranged on the non-contact surface.

7. The apparatus of any one of claims 1-4, wherein, The device further comprises a shell structure; The shell structure is arranged on the opposite end of the test cavity of the interface piece. The inner wall of the interface piece is provided with a corrosion-resistant coating; 8. The apparatus of claim 7, wherein, The material constituting the pressure piece comprises a corrosion-resistant material. ​ ​ 9. The apparatus of any one of claims 1-4, wherein, ​ ​ 10. The apparatus of any one of claims 1-4, wherein, ​ ​ ​

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