CN117810021A - Differential pressure switch with strong environmental adaptability - Google Patents
Differential pressure switch with strong environmental adaptability Download PDFInfo
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- CN117810021A CN117810021A CN202410225861.3A CN202410225861A CN117810021A CN 117810021 A CN117810021 A CN 117810021A CN 202410225861 A CN202410225861 A CN 202410225861A CN 117810021 A CN117810021 A CN 117810021A
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- 230000007613 environmental effect Effects 0.000 title claims abstract description 11
- 238000006073 displacement reaction Methods 0.000 claims abstract description 59
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 235000014676 Phragmites communis Nutrition 0.000 claims description 27
- 238000002679 ablation Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000003466 welding Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention discloses a differential pressure switch with strong environmental adaptability, which comprises a shell, wherein the shell comprises a low-pressure cavity and an electric cavity, the low-pressure cavity is communicated with a pressure-welding nozzle, a micro switch for converting a displacement signal into a switching value electric signal is arranged in the electric cavity, a high-pressure nozzle is also arranged on the shell, a pressure-sensitive displacement mechanism for converting the differential pressure signal into the displacement signal is arranged in the high-pressure nozzle, and a displacement transmission mechanism for transmitting the displacement signal to the micro switch is arranged between the low-pressure cavity and the electric cavity; the scheme can realize the sequential conversion of the differential pressure signal, the displacement signal and the switching value electric signal, thereby realizing the measurement of differential pressure; meanwhile, the electric cavity, the low-voltage cavity and the high-voltage cavity are sealed and isolated, so that the problem that a micro switch in the electric cavity is polluted by a medium is avoided; and the electric cavity is filled with inert gas for protection, so that the contact of the micro switch is in a good working environment, the ablation resistance of the contact is improved, and the medium adaptability of the differential pressure switch is improved.
Description
Technical Field
The invention relates to the technical field of differential pressure switches, in particular to a differential pressure switch with strong environmental adaptability.
Background
With the increasing complexity of the application environment of the differential pressure switch, the differential pressure switch widely applied in the aviation, aerospace and related fields at present has a plurality of problems, and mainly has the following defects:
1. the miniaturization and light weight degree is low: the pressure sensitive element of the pressure difference signal device with the existing structure is a diaphragm or a diaphragm box, when a small pressure difference is measured, the effective area of the pressure sensitive element is required to be increased, the diameter of a product is often increased, the volume and the weight of the product are further increased, the weight of a typical product exceeds 250g, and the volume is larger than (phi 42 multiplied by 110 mm);
2. insufficient differential pressure overload capability: the overload capacity of the pressure difference signal device with the existing structure depends on the protection of the stop device on the metal sensitive element (diaphragm and diaphragm capsule), and due to the limitation of the structure, the stop device often cannot protect the whole sensitive element molded surface, so that the pressure difference overload capacity (overload pressure difference/action pressure point) of the pressure switch is not more than 10, and the pressure difference signal device cannot adapt to the working condition of large pressure difference overload;
3. the medium adaptability is insufficient: the signal conversion component of the pressure difference switch with the existing structure is not completely isolated from the test medium, the test medium has corrosiveness to the signal conversion component, and the service life and reliability of the pressure difference switch are limited;
4. the signal conversion assembly has low reliability: the pressure difference switch with the existing structure adopts a spring piece combination as a signal conversion component, the contact gap of the pressure difference switch changes into linearity, and when the pressure of a test medium approaches to a product pressure action point, sparks and electric arcs are easy to generate, so that the contact of the pressure switch is ablated. The pressure switch is more obvious in vibration environment, and the reliability and the service life of the pressure switch are seriously affected. And when the pressure value changes near the rated action pressure value, the contact can be repeatedly closed and opened, and the pressure difference switch can send out a false alarm signal. If the rear end of the pressure switch is connected with an inductive load, induced electromotive force exists at the moment of opening the contact, so that the ablation of the contact point is accelerated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the differential pressure switch with strong environmental adaptability, and solves the problems of poor overload resistance, poor medium adaptability and contact ablation of the conventional differential pressure switch.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a differential pressure switch that environmental suitability is strong, it includes the casing, the casing includes low pressure chamber and electrical cavity, low pressure chamber and low pressure connection mouth piece intercommunication, be provided with in the electrical cavity and be used for converting displacement signal into the micro-gap switch of switching value signal, still be provided with high pressure connection mouth piece and socket on the casing, be provided with the pressure-sensitive displacement mechanism that is used for converting differential pressure signal into displacement signal in the high pressure connection mouth piece, be provided with between low pressure chamber and the electrical cavity and be used for transmitting displacement signal to the displacement transmission mechanism on the micro-gap switch, socket and micro-gap switch electric connection.
Further, the high-pressure joint mouth piece comprises an air inlet channel and a high-pressure cavity which are communicated with each other, the pressure-sensitive displacement mechanism comprises a corrugated pipe, one end of the corrugated pipe is fixed in the high-pressure cavity through a first lining, the other end of the corrugated pipe is provided with a second lining, the second lining is close to and opposite to the air inlet channel, a center rod is arranged on the second lining, and one end of the center rod penetrates through the inside of the corrugated pipe assembly and the first lining and is in contact with the displacement transmission mechanism.
Further, be provided with first spacing post and second spacing post on first bush and the second bush respectively, first spacing post and the setting of second spacing post are in opposite directions in the inside of bellows, offer the screw hole on the second spacing post, and the one end and the screw hole screw-thread fit of center pole are provided with the hole of dodging that is convenient for center pole pass on the first spacing post.
Further, an internal thread is arranged in the air inlet channel, a hollow adjusting screw is matched on the internal thread, an adjusting spring is arranged between the inner side end of the adjusting screw and the second bushing, and an annular groove for limiting the adjusting spring is formed in the second bushing.
Further, the corrugated pipe is formed by sequentially connecting a plurality of wave plates, and the molded surfaces of the wave plates are the same-direction molded surfaces.
Further, the displacement transmission mechanism comprises a driving rod and a driven rod which are respectively arranged in the low-voltage cavity and the electric cavity in a rotating mode, the driving rod and the driven rod are arranged in parallel, one ends of the driving rod and the driven rod are fixedly connected through a connecting rod, the connecting rod passes through a diaphragm mechanism to be sealed and penetrates through a shell between the low-voltage cavity and the electric cavity, and one end of the center rod is abutted against one end of the driving rod, which is far away from the connecting rod.
Further, the diaphragm mechanism comprises a mounting ring, the mounting ring is embedded on the shell between the low-pressure cavity and the electric cavity in a sealing way, a shaft seal diaphragm is arranged in the mounting ring, and the shaft seal diaphragm is sealed and arranged on the connecting rod.
Further, the shaft seal diaphragm comprises two corrugated molded surfaces in a fan shape, the two corrugated molded surfaces are symmetrically arranged on two sides of the shaft seal diaphragm, and the symmetrical axis of the two corrugated molded surfaces on the shaft seal diaphragm is perpendicular to the projection of the driven rod on the shaft seal diaphragm.
Further, the micro-gap switch includes the base, be provided with first contact, second contact and flat reed in the base, and first contact, second contact and flat reed pass through the wire respectively with three pin electric connection of socket, first contact and second contact set up in opposite directions, flat reed's one end is fixed on the support frame, be provided with bow reed between flat reed and the support frame, flat reed's the other end passes through the spacing and the first contact of bow reed, still the activity is provided with the transmission key that is used for transmitting displacement signal on the base, the one end looks away from the one end looks butt of connecting rod of driven lever, the other end and the flat reed looks butt of transmission key and can push up movable flat reed and second contact through the transmission key.
Further, the electric cavity is filled with inert gas.
The beneficial effects of the invention are as follows:
1. the scheme utilizes the characteristic that the rigidity of the corrugated pipe is linearly related to the wave number, so that the radial area of the pressure-sensitive displacement mechanism can be reduced in design, and the miniaturization and the light weight of the differential pressure switch are realized; the pre-pressure of the adjusting spring on the corrugated pipe can be adjusted through the adjusting screw rod so as to meet the requirements of various pressure difference working points; meanwhile, the wave number of the corrugated pipe, the rigidity of the spring and the compression quantity of the spring and the corrugated pipe are adjusted, so that stable measurement of a small pressure difference signal under the condition of small volume can be realized.
2. The corrugated pipe has excellent compression resistance, and is in a compressed state when the pressure difference between the high-pressure cavity and the low-pressure cavity rises; when the pressure difference reaches the stop pressure, the wave plates will overlap each other; the wave plate is of the same-direction molded surface and the wave shape is the same, so that wave crests and wave troughs on the molded surface of the wave plate can be well attached without deformation when being compressed, and the pressure difference and overload resistance of the pressure difference switch is improved; meanwhile, when the corrugated pipe is compressed to a certain degree, the first limiting column is abutted against the second limiting column, so that the corrugated pipe is prevented from being further compressed, and the corrugated pipe is protected against overload.
3. The center rod can prop the driving rod, the driven rod and the connecting rod to deflect by taking the shaft seal diaphragm as a fulcrum, so that displacement signals are transmitted from the low-voltage cavity to the electric cavity; meanwhile, the shaft seal diaphragm can realize the sealing and isolation of the low-voltage cavity and the electric cavity, so that the problem that a micro switch in the electric cavity is polluted by a medium is avoided; meanwhile, inert gas is filled into the electric cavity for protection, so that the contact of the micro switch is in a good working environment, and the ablation resistance of the contact is improved.
4. The invention can improve the on-off speed of the differential pressure switch and solve the problem of too small gap between the contacts of the switch by utilizing the instantaneous characteristic of the state transition of the micro switch, thereby avoiding the problem of contact ablation caused by repeated on-off of the pressure switch in the vibration environment of the traditional differential pressure switch and being the key for ensuring the long-term stable operation of the differential pressure switch.
Drawings
Fig. 1 is a schematic diagram of the structure of the inside of the differential pressure switch according to the present embodiment.
Fig. 2 is a schematic structural view of the high-pressure nozzle and the pressure-sensitive displacement mechanism.
Fig. 3 is a schematic structural view of a bellows.
Fig. 4 is a schematic structural view of the displacement transmission mechanism.
FIG. 5 is an end view of the shaft seal diaphragm.
FIG. 6 is a view of a shaft seal diaphragm
Fig. 7 is a schematic structural diagram of the micro switch.
Wherein 1, a shell, 2, a low-pressure cavity, 3, an electric cavity, 4, a low-pressure nozzle, 5, a high-pressure nozzle, 51, an air inlet channel, 52, a high-pressure cavity, 53, an adjusting screw, 54, an adjusting spring, 6, a pressure-sensitive displacement mechanism, 61, a corrugated pipe, 611, a wave plate, 62, a first bushing, 63, a second bushing, 64, a central rod, 65, a first limit column, 66, a second limit column, 67, avoiding holes, 68, annular grooves, 7, a displacement transmission mechanism, 71, a driving rod, 72, a driven rod, 73, a connecting rod, 74, a mounting ring, 75, a shaft seal diaphragm, 76, a corrugated surface, 8, a micro switch, 81, a base, 82, a first contact, 83, a second contact, 84, a flat reed, 85, a support frame, 86, a bow reed, 87, a transmission key, 9 and a socket.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Example 1
As shown in fig. 1, the differential pressure switch with strong environmental adaptability in this scheme includes casing 1, casing 1 includes low pressure chamber 2 and electrical chamber 3, low pressure chamber 2 and low pressure nozzle 4 intercommunication, low pressure nozzle 4 is connected with outside low pressure medium pipeline, be provided with micro-gap switch 8 that is used for converting displacement signal into the switching value signal in the electrical chamber 3, and be filled with inert gas in the electrical chamber 3, still be provided with high pressure nozzle 5 and socket 9 on the casing 1, high pressure nozzle 5 includes intake passage 51 and high pressure chamber 52 of intercommunication, intake passage 51 is connected with outside high pressure medium pipeline, be provided with in the high pressure chamber 52 and be used for converting differential pressure signal into displacement signal's pressure sensitive displacement mechanism 6, be provided with between low pressure chamber 2 and the electrical chamber 3 and be used for transferring displacement signal to the displacement transfer mechanism 7 on the micro-gap switch 8, socket 9 and micro-gap switch 8 electric connection.
According to the scheme, through the cooperation of the pressure-sensitive displacement mechanism 6, the displacement transmission mechanism 7 and the micro switch 8, the sequential conversion of a differential pressure signal, a displacement signal and an on-off electrical signal is realized, so that the measurement of differential pressure is realized; meanwhile, the electric cavity 3, the low-voltage cavity 2 and the high-voltage cavity 52 are all sealed and isolated by welding, so that the problem that the micro switch 8 in the electric cavity 3 is polluted by a medium is avoided; and the electric cavity 3 is filled with inert gas for protection, so that the contact of the micro switch 8 is in a good working environment, the ablation resistance of the contact is improved, and the medium adaptability of the differential pressure switch in the scheme is greatly improved.
Example 2
As shown in fig. 2, the embodiment provides a specific scheme of the pressure-sensitive displacement mechanism 6 on the basis of embodiment 1, wherein the pressure-sensitive displacement mechanism 6 comprises a bellows 61, the bellows 61 is used for sensing the pressure difference of the medium to be measured in the high-pressure chamber 52 and the low-pressure chamber 2 and converting the pressure difference signal into a linear displacement signal, one end of the bellows 61 is fixed in the high-pressure chamber 52 through a first bushing 62, the other end of the bellows 61 is provided with a second bushing 63, the second bushing 63 is close to and opposite to the air inlet channel 51, a center rod 64 is arranged on the second bushing 63, and one end of the center rod 64 passes through the inside of the bellows 61 assembly and the first bushing 62 and is in contact with the displacement transmission mechanism 7.
As shown in fig. 3, the bellows 61 is formed by sequentially welding a plurality of wave plates 611, two ends of the bellows 61 are respectively sealed by a first bushing 62 and a second bushing 63, and the bellows 61 in the scheme is a tubular elastic sensing element formed by connecting the foldable wave plates 611 along the folding and telescoping directions, and the rigidity of the tubular elastic sensing element is inversely proportional to the number of the wave plates 611, so that the radial size of the pressure-sensitive displacement mechanism 6 can be reduced by times by increasing the wave plates 611, thereby realizing miniaturization and light weight of the differential pressure switch.
In design, the profiles of the wave plates 611 are the same-direction profiles, namely, the profiles of the wave plates 611 are different in inclination angle, and the shapes and parameters of the other waves are consistent, so that the design can ensure that the bonding area of the profiles of two adjacent wave plates 611 is the largest under the condition of large overload, thereby ensuring that the maximum stress of the corrugated pipe 61 is lower than the safe stress of materials under the condition of large overload, and ensuring that the corrugated pipe 61 has excellent compression resistance, in particular, when the pressure difference between the high-pressure cavity 52 and the low-pressure cavity 2 rises and reaches the stop pressure, the adjacent wave plates 611 on the corrugated pipe 61 are mutually overlapped, and at the moment, the wave peaks and the wave troughs on the profiles of the wave plates 611 can be well bonded without deformation when being compressed, so that the pressure difference overload capacity of the pressure difference switch is improved.
The first bushing 62 and the second bushing 63 are respectively provided with a first limit post 65 and a second limit post 66, the first limit post 65 and the second limit post 66 are oppositely arranged in the corrugated pipe 61, the second limit post 66 is provided with a threaded hole, one end of the center rod 64 is in threaded fit with the threaded hole, and the first limit post 65 is provided with an avoidance hole 67 which is convenient for the center rod 64 to pass through; the arrangement ensures that the center rod 64 is convenient to assemble and disassemble, and the center rod 64 can be replaced by materials with different thermal expansion coefficients or replaced by center rods 64 with different lengths according to the temperature compensation calculation result and the actual length condition of the corrugated pipe 61, so that the product has good high-low temperature adaptability and production adaptability; meanwhile, when the corrugated tube 61 is compressed to a certain extent, the first limit post 65 and the second limit post 66 can be mutually abutted, so that the corrugated tube 61 is prevented from being further compressed, and the corrugated tube 61 is protected against overload.
An internal thread is arranged in the air inlet channel 51, a hollow adjusting screw rod 53 is matched on the internal thread, an adjusting spring 54 is arranged between the inner side end of the adjusting screw rod 53 and the second bushing 63, and an annular groove 68 for limiting the adjusting spring 54 is arranged on the second bushing 63 so as to ensure that a spring bus is consistent with a corrugated pipe 61 bus in the displacement transmission process; the scheme can adjust the pre-pressure of the adjusting spring 54 on the corrugated pipe 61 through the adjusting screw 53 so as to meet the requirements of various pressure difference working points; meanwhile, by adjusting the wave number of the corrugated tube 61, the rigidity of the spring 54 and the compression amount of the spring 54 and the corrugated tube 61, stable measurement of a small pressure difference signal under the condition of small volume can be realized.
Example 3
As shown in fig. 4, this embodiment provides a specific scheme of the displacement transmission mechanism 7 on the basis of embodiment 1, wherein the displacement transmission mechanism 7 includes a driving rod 71 and a driven rod 72 which are respectively rotatably disposed in the low-voltage cavity 2 and the electric cavity 3, and the driving rod 71 and the driven rod 72 are disposed in parallel, one ends of the driving rod 71 and the driven rod 72 are fixedly connected through a connecting rod 73, the connecting rod 73 is disposed on the diaphragm mechanism, the diaphragm mechanism includes a mounting ring 74, and the mounting ring 74 is sealingly embedded on the housing 1 between the low-voltage cavity 2 and the electric cavity 3, a shaft seal diaphragm 75 is disposed in the mounting ring 74, the shaft seal diaphragm 75 is sealed and disposed on the connecting rod 73, and one end of the center rod 64 is abutted against one end of the driving rod 71 far from the connecting rod 73.
The displacement transmission mechanism 7 of the present embodiment mainly has the following two functions:
1. the displacement transmission mechanism 7 converts the linear displacement transmitted by the pressure sensitive displacement mechanism 6 into angular displacement, specifically, the central rod 64 can push the driving rod 71, the driven rod 72 and the connecting rod 73 to deflect by taking the shaft seal diaphragm 75 as a fulcrum, so that the displacement signal is transmitted from the low-voltage cavity 2 to the micro switch 8 in the electric cavity 3.
2. Adopts a unique shaft seal diaphragm 75 isolation technology to realize the seal isolation of the electric cavity 3 and the low-pressure cavity 2, and the leakage rate is less than 1 multiplied by 10 -9 Pa. m 3 And/s, the problem that the micro switch 8 in the electric cavity 3 is polluted by the medium is avoided.
As shown in fig. 5 and 6, the shaft seal diaphragm 75 includes two corrugated surfaces 76 having a fan shape, the two corrugated surfaces 76 are symmetrically disposed on both sides of the shaft seal diaphragm 75, and the symmetry axis of the two corrugated surfaces 76 on the shaft seal diaphragm 75 is perpendicular to the projection of the driven rod 72 on the shaft seal diaphragm 75; the arrangement can utilize the rigidity difference between the plane of the shaft seal diaphragm 75 and the corrugated molded surface 76, so that the shaft seal diaphragm 75 is flexible to rotate, and has better molded surface parameter consistency and characteristic consistency than the plane shaft seal diaphragm 75, namely, the stable deflection of the driving rod 71, the driven rod 72 and the connecting rod 73 is facilitated.
In particular, the dimensions of the driving rod 71, the driven rod 72 and the connecting rod 73 of the displacement transmission mechanism 7 in the scheme are designed through special calculation, so that the rotation angle displacement can be limited, and the micro switch 8 is ensured not to be overtravel at any time; to ensure the stability and the service life of the micro switch 8.
Example 4
As shown in fig. 7, the embodiment provides a specific scheme of the micro switch 8 on the basis of embodiment 1, the micro switch 8 includes a base 81, the base 81 is fixed in the electric cavity 3 by riveting, a first contact 82, a second contact 83 and a flat reed 84 are arranged in the base 81, the first contact 82, the second contact 83 and the flat reed 84 are respectively connected with an NC pin, an NO pin and a C pin, and are respectively electrically connected with three pins of the socket 9 by wires; wherein the first contact 82 and the second contact 83 are arranged in opposite directions, one end of the flat spring 84 is fixed on the support 85, an arch spring 86 is arranged between the flat spring 84 and the support 85, and the other end of the flat spring 84 contacts the first contact 82 through the limit of the arch spring 86, so that the NC pin and the C pin are connected (namely, the state when the micro switch 8 is not subjected to external force); the base 81 is also movably provided with a transmission key 87 for transmitting displacement signals, one end of the transmission key 87 is abutted against one end of the driven rod 72 far away from the connecting rod 73, and the other end of the transmission key 87 is abutted against the flat reed 84 and can push the flat reed 84 to contact with the second contact 83 through the transmission key 87.
When the driven rod 72 deflects (namely, transmits a displacement signal) and pushes the transmission key 87, the flat reed 84 and the bow reed 86 elastically deform under the pressure of the transmission key 87 and store elastic potential energy, when the transmission key 87 moves downwards to reach a reversing point, the micro switch 8 instantaneously reverses, the end part of the flat reed 84 rotates and contacts with the second contact 83, and at the moment, the pin C is disconnected with the NC and connected with the pin NO; when the external force of the transmission key 87 is eliminated, the flat spring plate 84 and the bow spring plate 86 release elastic potential energy, the micro switch 8 returns to a free state under the combined action of the elastic forces of the flat spring plate 84 and the bow spring plate 86, and an action cycle is completed, so that the displacement signal is converted into an on-off electrical signal.
The micro switch 8 is a snap mechanism which can generate displacement mutation when being loaded or unloaded to a certain degree, and the snap characteristic of the state conversion of the micro switch 8 is utilized, so that the switching-on and switching-off speed of the differential pressure switch can be improved, the problem of too small gap between switch contacts is solved, the problem of contact ablation caused by repeated switching-on and switching-off of the pressure switch in the vibration environment of the traditional differential pressure switch is avoided, and the key of ensuring the long-term stable operation of the differential pressure switch is realized.
In combination with the above embodiments 1-4, when the differential pressure switch of this embodiment is used, the bellows 61 in the pressure-sensitive displacement mechanism 6 senses the differential pressure of the medium to be measured in the high-pressure chamber 52 and the low-pressure chamber 2, as the differential pressure increases, the bellows 61 is gradually compressed, when the specified differential pressure value is reached, the central rod 64 pushes the driving rod 71 and the driven rod 72 to deflect, and the driven rod 72 pushes the driving key 87 of the micro switch 8 to move, when the driving key 87 reaches the reversing point, the micro switch 8 is instantaneously reversed, so as to realize the state switching of the switching value electric signal, and finally the micro switch 8 can transmit the switching value electric signal to the socket 9 and be used for collecting by an external system.
Claims (10)
1. The utility model provides a differential pressure switch that environmental suitability is strong, its characterized in that includes the casing, the casing includes low pressure chamber and electrical cavity, low pressure chamber and low pressure connection mouth piece intercommunication, be provided with in the electrical cavity and be used for converting displacement signal into the micro-gap switch of switching value signal, still be provided with high pressure connection mouth piece and socket on the casing, be provided with the pressure-sensitive displacement mechanism that is used for converting differential pressure signal into displacement signal in the high pressure connection mouth piece, be provided with the displacement transmission mechanism who is used for transmitting displacement signal to micro-gap switch between low pressure chamber and the electrical cavity, socket and micro-gap switch electric connection.
2. The environmentally-friendly differential pressure switch according to claim 1, wherein the high-pressure nozzle comprises an air inlet channel and a high-pressure cavity which are communicated with each other, the pressure-sensitive displacement mechanism comprises a corrugated pipe, one end of the corrugated pipe is fixed in the high-pressure cavity through a first bushing, the other end of the corrugated pipe is provided with a second bushing, the second bushing is close to and opposite to the air inlet channel, a central rod is arranged on the second bushing, and one end of the central rod penetrates through the interior of the corrugated pipe and the first bushing and is in contact with the displacement transmission mechanism.
3. The pressure difference switch with strong environmental adaptability according to claim 2, wherein the first bushing and the second bushing are respectively provided with a first limit post and a second limit post, the first limit post and the second limit post are oppositely arranged in the corrugated pipe, the second limit post is provided with a threaded hole, one end of the center rod is in threaded fit with the threaded hole, and the first limit post is provided with an avoidance hole which is convenient for the center rod to pass through.
4. The pressure difference switch with strong environmental adaptability according to claim 2, wherein an internal thread is arranged in the air inlet channel, a hollow adjusting screw is matched on the internal thread, an adjusting spring is arranged between the inner side end of the adjusting screw and the second bushing, and an annular groove for limiting the adjusting spring is arranged on the second bushing.
5. The environmentally-friendly differential pressure switch of claim 2 wherein the bellows is formed by sequentially connecting a plurality of wave plates, and the profiles of the wave plates are co-directional profiles.
6. The environmentally-friendly differential pressure switch according to claim 2, wherein the displacement transmission mechanism comprises a driving rod and a driven rod which are respectively rotatably arranged in the low-voltage cavity and the electric cavity, the driving rod and the driven rod are arranged in parallel, one ends of the driving rod and the driven rod are fixedly connected through a connecting rod, the connecting rod is hermetically penetrated on a shell between the low-voltage cavity and the electric cavity through a diaphragm mechanism, and one end of the center rod is abutted against one end of the driving rod, which is far away from the connecting rod.
7. The environmentally friendly differential pressure switch of claim 6 wherein the diaphragm mechanism comprises a mounting ring and wherein the mounting ring is sealingly engaged to the housing between the low pressure chamber and the electrical chamber, and wherein a shaft seal diaphragm is disposed within the mounting ring and wherein the shaft seal diaphragm is sealingly engaged to the connecting rod.
8. The environmentally friendly differential pressure switch of claim 7 wherein the shaft seal diaphragm comprises two corrugated profiles in the shape of a fan, the two corrugated profiles are symmetrically disposed on both sides of the shaft seal diaphragm, and the symmetry axis of the two corrugated profiles on the shaft seal diaphragm is perpendicular to the projection of the driven rod on the shaft seal diaphragm.
9. The differential pressure switch with strong environmental adaptability according to claim 6, wherein the micro switch comprises a base, a first contact, a second contact and a flat reed are arranged in the base, the first contact, the second contact and the flat reed are respectively and electrically connected with three pins of a socket through wires, the first contact and the second contact are oppositely arranged, one end of the flat reed is fixed on a support frame, an arch reed is arranged between the flat reed and the support frame, the other end of the flat reed is contacted with the first contact through the limit of the arch reed, a transmission key for transmitting displacement signals is further movably arranged on the base, one end of the transmission key is abutted against one end of a driven rod far away from a connecting rod, and the other end of the transmission key is abutted against the flat reed and can prop up the movable flat reed to contact with the second contact through the transmission key.
10. The environmentally friendly differential pressure switch of claim 1 wherein said electrical cavity is filled with an inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410225861.3A CN117810021A (en) | 2024-02-29 | 2024-02-29 | Differential pressure switch with strong environmental adaptability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410225861.3A CN117810021A (en) | 2024-02-29 | 2024-02-29 | Differential pressure switch with strong environmental adaptability |
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| CN117810021A true CN117810021A (en) | 2024-04-02 |
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| CN202410225861.3A Pending CN117810021A (en) | 2024-02-29 | 2024-02-29 | Differential pressure switch with strong environmental adaptability |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115910683A (en) * | 2022-11-21 | 2023-04-04 | 成都凯天电子股份有限公司 | Differential pressure switch |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115910683A (en) * | 2022-11-21 | 2023-04-04 | 成都凯天电子股份有限公司 | Differential pressure switch |
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