CN101930872A - Improved gas differential pressure switch - Google Patents
Improved gas differential pressure switch Download PDFInfo
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- CN101930872A CN101930872A CN2009101751986A CN200910175198A CN101930872A CN 101930872 A CN101930872 A CN 101930872A CN 2009101751986 A CN2009101751986 A CN 2009101751986A CN 200910175198 A CN200910175198 A CN 200910175198A CN 101930872 A CN101930872 A CN 101930872A
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- fixed contact
- indicating device
- differential pressure
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Abstract
The invention relates to an improved gas differential pressure switch. The improved gas differential pressure switch comprises a casing, a gas film, a first gas cavity, a second gas cavity, a first gas hole and a second gas hole. A contact actuating mechanism arranged in the first gas gravity comprises a moving contact and stationary contacts. The contact actuating mechanism cooperates with the gas film which controls the closing and breaking of the moving contact and the stationary contacts. The improved gas differential pressure switch also comprises a detection indicator which cooperates with the contact actuating mechanism to detect and indicate the closure and/or disconnected statuses of the moving contact and the stationary contacts. The detection indicator of the invention detects and displays the closure and disconnected statuses of the moving contact a and the first stationary contact b1 and the second stationary contact b2 so that a user can correctly judge the operating mode of the gas differential pressure switch at a glance. The improved gas differential pressure switch facilitates the detection of troubles, improves the trouble detection efficiency, and avoids the human and material resources consumed on the one-by-one detection of other system equipment as well as the time wasted on the detection.
Description
Technical field
The present invention relates to a kind of switch, particularly a kind of improved gas differential pressure switch.
Background technology
At present, particularly the gas differential pressure switch application is very extensive for pressure difference switch, especially is widely used in central air conditioning system.It comes conducting circuit system or start-up system equipment according to variation of gas pressure.Have gas pressure and detect advantages such as sensitive, that startup is accurate.
As State Intellectual Property Office in Granted publication on April 8th, 2009, the patent No. is that ZL200820111548.3, name are called the utility model patent of " pressure difference switch ", a kind of pressure difference switch is disclosed, it is the sealing device that a usefulness diaphragm is divided into the high and low pressure chamber, the high and low pressure chamber respectively is provided with a blow vent and communicates with tested air-flow, and the distortion size that described diaphragm produces is directly proportional with magnitude of pressure differential.Establish actuating mechanism in the low-pressure chamber, comprise upper and lower two fixed contacts and between a moving contact; Moving contact and last fixed contact are formed one group of normally-closed contact, and moving contact and following fixed contact are formed one group of normally opened contact.The utility model good looking appearance is generous, is easy to assembling, and is highly sensitive, action accurately and reliably, and is cheap, and this product is used widely in a large amount of building self control air conditioning systems, for the normal operation of central air conditioner system provides the fault detect means, improved the security reliability of system greatly.
In this patent scheme, pressure difference switch does not have the detection and the alarm function of self break-make situation, when pressure difference switch breaks down, can not in time detect and remind the user.Equally, when breaking down in the whole system, in the process of malfunction elimination, can't find whether cause the fault of whole system the very first time, malfunction elimination efficient is reduced owing to pressure difference switch goes wrong.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the invention provides a kind of improved gas differential pressure switch.The detection indicating device is set, and whether the detected gas pressure difference switch is in normal operating conditions in the process of work.In time detect in case break down and provide, improve whole system operation efficient, and malfunction elimination efficient.
The main technical schemes that the present invention adopts is: a kind of improved gas differential pressure switch, comprise housing, be positioned at the air film of described housing, first air cavity and second air cavity that are separated into by described air film, first pore that is communicated with described first air cavity, second pore that is communicated with described second air cavity, in described first air cavity, be provided with the contact actuating mechanism, described contact actuating mechanism comprises moving contact, fixed contact, described contact actuating mechanism matches with described air film and is controlled the closed or disconnection of described moving contact and fixed contact by described air film, also comprise the detection indicating device, described detection indicating device matches with described contact actuating mechanism and detects the closure and/or the off-state of described moving contact and fixed contact and indicated.
The present invention also adopts following attached technical scheme: described fixed contact comprises first fixed contact and second fixed contact, described contact actuating mechanism comprises the last shell fragment of being located on the described housing, following shell fragment, the spring plate that matches with described upward shell fragment, following shell fragment and the spring that matches with described spring plate, the described shell fragment of going up is provided with described first fixed contact, described shell fragment down is provided with described second fixed contact, described spring plate is provided with described moving contact, and described moving contact matches with described first fixed contact, second fixed contact;
Described detection indicating device comprises testing circuit, and described testing circuit and described first fixed contact, second fixed contact and moving contact are electrically connected and detect described moving contact and described first fixed contact or with the closure state of described second fixed contact and indicated;
Described testing circuit comprises first indicating device, second indicating device, first resistance, second resistance and binding post, described first indicating device is connected with first resistance, second indicating device is connected with second resistance, described first indicating device that is in series and first resistance are in parallel with second indicating device that is in series and second resistance, common No. 2 ports that insert described binding post of one end of described first resistance and second resistance, one end of described first indicating device and second indicating device is connected with second fixed contact with described first fixed contact respectively, and described moving contact is connected with No. 1 port of described binding post;
Described first indicating device and second indicating device are light-emitting diode or buzzer or vibrator;
Described contact actuating mechanism also comprises U type shell fragment, the body of described spring plate has breach, one end of described breach is extended with or is provided with a shell fragment movable up and down to the other end, and the other end of an end of described U type shell fragment and front end flexible connection, the other end and the described breach of described shell fragment flexibly connects;
Described gas differential pressure switch also comprises pressure adjustment knob, and an end of described spring relies on the described shell fragment, and the other end is connected with described pressure adjustment knob, and described air film contacts with described shell fragment;
Described detection indicating device is located on the described housing, dismountable protective cover that is equipped with on the described housing, and described detection indicating device is positioned at described protective cover;
Described protective cover adopts transparent material to make, and has through hole on the described protective cover or is provided with reinforcement;
Described testing circuit comprises light-emitting diode, resistance and binding post, described light-emitting diode and resistance, binding post are in series, described resistance one termination is gone into No. 2 ports of described binding post, described light-emitting diode one end is connected with described first fixed contact, and described moving contact is connected with No. 1 port of described binding post.
The beneficial effect that adopts the present invention to bring is: (1) the present invention is provided with the detection indicating device on gas differential pressure switch, be used for detecting and indicating the closure state of the gas differential pressure switch moving contact and first fixed contact or the closure state of the moving contact and second fixed contact.When moving contact and first fixed contact closure, the first light-emitting diode conducting is luminous, and the indication moving contact and first fixed contact are in on-state.When moving contact and second fixed contact closure, the second light-emitting diode conducting is luminous, and the indication moving contact and second fixed contact are in on-state.2 light-emitting diodes are set, by the bright of first light-emitting diode and second light-emitting diode or go out the closure state of indicating contacts.The user is clear for one act, clearly knows the residing operating state of gas differential pressure switch, be with the first fixed contact closure or with the second fixed contact closure.The detection investigation of more convenient fault.When whole central air conditioner system breaks down, as knowing that in the very first time fault by gas differential pressure switch causes, then improved fault detect efficient greatly, avoid investigating other system equipment one by one and the consumption of the human and material resources that cause.Compare with existing common pressure difference switch, installation is provided with the detection indicating device and has obtained beyond thought beneficial effect, particularly in fault detect, and whole central air conditioner system malfunction elimination aspect, bring very good effect.Improve the efficient of malfunction elimination, detection greatly, saved human and material resources.And its enforcement, installation are simply, conveniently, and production cost is low, is easy to popularize.Will be the substitute products of pressure difference switch of future generation.(2) protective cover is installed on housing, is detected indicating device and be positioned at protective cover, play a very good protection, prevent to detect indicating device and be subjected to the influence of external environment condition and damage.(3) when indicating device adopts buzzer, on protective cover, install the range of sounds that through hole can spread buzzer additional.(4) intensity that reinforcement can further improve protective cover is set on protective cover.(5) in another embodiment provided by the invention, the testing circuit that detects in the indicating device only adopts a light-emitting diode, only detects the closure state of the moving contact a and the first fixed contact b1.Light-emitting diode D1 lights, disconnects then and not working after the moving contact a and the first fixed contact b1 closure.In some field of employment, often pressure difference switch only need detect with the closure state of one of them fixed contact to learn whether be on off operating mode, therefore, be applied in such place pressure difference switch only with a light-emitting diode be set get final product, promptly play the effect that detects indication, also its corresponding simplified circuit structure, reduce production costs.
Description of drawings
Fig. 1 splits schematic diagram for the parts of gas differential pressure switch of the present invention;
Fig. 2 detects the circuit diagram of testing circuit in the indicating device for the present invention;
Fig. 3 is the circuit diagram that detects testing circuit in the indicating device in another embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed description:
As shown in Figure 1 and Figure 2, be a kind of improved gas differential pressure switch provided by the invention, first air cavity that comprise housing, be positioned at the air film 2 of described housing, is separated into by described air film 2 and second air cavity, first pore 3 that is communicated with described first air cavity, second pore 4 that is communicated with described second air cavity, in described first air cavity, be provided with the contact actuating mechanism, described contact actuating mechanism comprises moving contact a, fixed contact, and described contact actuating mechanism matches by the closed of described air film 2 described moving contact a of control and fixed contact or disconnects with described air film 2.Also comprise the detection indicating device, described detection indicating device matches with described contact actuating mechanism and detects the closure and/or the off-state of described moving contact a and fixed contact and indicated.
In the present embodiment, housing comprises loam cake 1 and the lower cover 1 ' that is connected.First air cavity is formed by air film 2 and loam cake 1, and second air cavity is formed by air film 2 and lower cover 1 '.
As shown in Figure 1, described fixed contact comprises the first fixed contact b1 and the second fixed contact b2, and described contact actuating mechanism comprises the last shell fragment of being located on the described housing 15, following shell fragment 6, the spring plate 7 that matches with described upward shell fragment 5, following shell fragment 6 and the spring 8 that matches with described spring plate 7.Last shell fragment 5 and following shell fragment 6 are the structure of English words master L-shape or numeral " 7 " shape, and last shell fragment 5, following shell fragment 6 and spring plate 7 are installed on the loam cake 1 respectively and are arranged in first air cavity.Last shell fragment 5 is positioned at the top of spring plate 7, and following shell fragment 6 is positioned at the below of spring plate 7, realizes and last shell fragment 5 or following fitting or leaving of shell fragment 6 by moving up and down of spring plate 7.
As shown in Figure 1, the described shell fragment 5 of going up is provided with the described first fixed contact b1, and described shell fragment 6 down is provided with the described second fixed contact b2, and described spring plate 7 is provided with described moving contact a, and described moving contact a matches with the described first fixed contact b1, the second fixed contact b2.The described first fixed contact b1 is positioned at the front end of shell fragment 5, and the second fixed contact b2 is positioned at the front end of shell fragment down, and moving contact a is positioned at the front end of spring plate 7.These three contacts are spatially corresponding successively from top to bottom arranges, the moving up and down of spring plate 7 can drive moving contact a and first fixed contact b1 closure or with the second fixed contact b2 closure.
Described contact actuating mechanism also comprises U type shell fragment 9, the body of described spring plate 7 has breach 71, described breach 71 is extended with or is provided with front end shell fragment 72 moving up and down, and the other end of an end of described U type shell fragment 9 and the front end flexible connection of described shell fragment 72, the other end and described breach 71 flexibly connects.
In the present embodiment, U type shell fragment 9 is connected with shell fragment 72 and drives similar that spring plate 7 moves up and down in lever principle.Be described in detail as follows: when air film 2 is heaved by the gas pressure change distortion, leaning shell fragment 72 moves up its front end, and then an end that drives the U type shell fragment 9 that is attached thereto together moves up, because the other end of U type shell fragment 9 and the other end of breach 71 flexibly connect, in the process that an end of U type shell fragment 9 moves up, because the particular design of U-shaped structure, U type shell fragment 9 can rotate, the other end of U type shell fragment 9 is moved down, thereby the front end that drives spring plate 7 is bent downwardly, and makes the second fixed contact b2 closure on moving contact a and the following shell fragment 6.Otherwise, after the gas differential pressure in first air cavity and second air cavity disappears, air film 2 recovers shape, become normal condition by heaving, this moment, spring plate 7 moved down under the leaning of spring 8, and then an end that drives the U type shell fragment 9 be attached thereto together moves down, and the other end of U type shell fragment 9 is understood relative moving up in the process that moves down, thereby the front end that drives spring plate 7 is bent upwards, and makes the first fixed contact b1 closure on moving contact a and the last shell fragment 5.
As shown in Figure 2, described detection indicating device comprises testing circuit, and described testing circuit and the described first fixed contact b1, the second fixed contact b2 and moving contact a are electrically connected and detect described moving contact a and the described first fixed contact b1 or with the closure state of the described second fixed contact b2 and indicated.Described testing circuit comprises first indicating device, second indicating device, first resistance R 1, second resistance R 2 and binding post P1, described first indicating device is connected with first resistance R 1, second indicating device is connected with second resistance R 2, described first indicating device that is in series and first resistance R 1 are in parallel with second indicating device that is in series and second resistance R 2, common No. 2 ports that insert described binding post P1 of one end of described first resistance R 1 and second resistance R 2, one end of described first indicating device and second indicating device is connected with second fixed contact with described first fixed contact respectively, and described moving contact is connected with No. 1 port of described binding post P1.
Described first indicating device and second indicating device are light-emitting diode or buzzer or vibrator.Every play the electric elements of prompting, warning function by modes such as sound, light, vibrations, change color all can be as first indicating device of the present invention and second indicating device.In the present embodiment, as shown in Figure 2, first indicating device is light-emitting diode D1, and second indicating device is light-emitting diode D2.
When having pressure, gas differential pressure switch changes, after air film 2 is heaved and is driven moving contact a and second fixed contact, 2 closures, the loop conducting that is in series by second resistance R 2, light-emitting diode D2, light-emitting diode D2 lights, and points out present gas differential pressure switch to be in the state of the moving contact a and the second fixed contact b2 conducting.At this moment, the moving contact a and the first fixed contact b1 disconnect, and light-emitting diode D1 does not work.
Gas differential pressure disappears in gas differential pressure switch, and air film 2 is replied shapes, spring plate 7 under the effect of spring 8, make moving contact a with second fixed contact b2 disconnection with the first fixed contact b1 closure.At this moment, by the loop conducting that first resistance R 1 and light-emitting diode D1 are in series, light-emitting diode D1 lights, and points out present gas differential pressure switch to be in the state of the moving contact a and the first fixed contact b1 conducting.At this moment, the moving contact a and the second fixed contact b2 disconnect, and light-emitting diode D2 does not work.
By the bright of light-emitting diode D1 and light-emitting diode D2 or go out and indicate moving contact a and the first fixed contact b1, the closure of the second fixed contact b2, off-state, the user is clear for one act, accurately judging the residing operating state of gas differential pressure switch, is conducting or disconnection.The detection investigation of more convenient fault.When whole central air conditioner system breaks down, as knowing that in the very first time fault by gas differential pressure switch causes, then improved fault detect efficient greatly, avoided investigating other system equipment one by one and the consumption of the human and material resources that cause, and the waste of detection time.
In the foregoing description provided by the invention, described gas differential pressure switch also comprises pressure adjustment knob 10, and an end of described spring 8 relies on the described shell fragment 72, and the other end is connected with described pressure adjustment knob 10, and described air film 2 contacts with described shell fragment 72.Pressure-regulating device increases or reduces the elastic force that spring 8 leans shell fragment 72 by adjusting the distance of spring 8 with respect to shell fragment 72.When the concrete power of spring with respect to shell fragment 72 reduces, then corresponding elastic force against shell fragment 72 increases, since air film 2 and spring 8 distinguish corresponding against with the both sides of shell fragment 72, therefore air film 2 can be with shell fragment 72 jack-up just then need variation of gas pressure to increase accordingly in order to overcome the elastic force that spring 8 increases.Usually, the adjustable range of pressure adjustment knob 10 is between 20pa-200pa.
In the foregoing description provided by the invention: described detection indicating device is located on the described loam cake 1; dismountable protective cover 11 that is equipped with on the described loam cake 1; described detection indicating device is positioned at described protective cover 11; the user protects the detection indicating device not to be subjected to the image of external environment condition and damages, and increases the service life.When adopting light-emitting diode in detecting indicating device, described protective cover 11 adopts transparent materials to make, so that the user can observe the operating state of light-emitting diode among the external environment condition.Have through hole on the described protective cover 11, when detecting indicating device employing buzzer, through hole can effectively increase the sphere of action of buzzer.Flameproof enclosure 11 is provided with reinforcement, can further improve the intensity of protective cover 11, increases the service life.
As shown in Figure 3, be another embodiment provided by the invention, in this embodiment, the testing circuit that detects in the indicating device only adopts a light-emitting diode, only detects the closure state of the moving contact a and the first fixed contact b1.Testing circuit comprises light-emitting diode D1, resistance R 1 and binding post P1, described light-emitting diode D1 and resistance R 1, binding post P1 are in series, resistance R 1 one terminations are gone into No. 2 ports of binding post P1, light-emitting diode D1 one end is connected with the first fixed contact b1, and moving contact a is connected with No. 1 port of binding post P1.
Light-emitting diode D1 lights, disconnects then and not working after the moving contact a and the first fixed contact b1 closure.In some field of employment, often pressure difference switch only need detect with the closure state of one of them fixed contact to learn whether be on off operating mode, therefore, be applied in such place pressure difference switch only with a light-emitting diode be set get final product, promptly play the effect that detects indication, also its corresponding simplified circuit structure, reduce production costs.
Claims (10)
1. improved gas differential pressure switch, comprise housing, be positioned at the air film (2) of described housing, first air cavity and second air cavity that are separated into by described air film (2), first pore (3) that is communicated with described first air cavity, second pore (4) that is communicated with described second air cavity, in described first air cavity, be provided with the contact actuating mechanism, described contact actuating mechanism comprises moving contact (a), fixed contact, described contact actuating mechanism matches with described air film (2) and is controlled the closed or disconnection of described moving contact (a) and fixed contact by described air film (2), it is characterized in that: also comprise the detection indicating device, described detection indicating device matches with described contact actuating mechanism and detects the closure and/or the off-state of described moving contact (a) and fixed contact and indicated.
2. gas differential pressure switch according to claim 1, it is characterized in that: described fixed contact comprises first fixed contact (b1) and second fixed contact (b2), described contact actuating mechanism comprises the last shell fragment of being located on the described housing (1) (5), following shell fragment (6), with the described shell fragment (5) of going up, the spring plate (7) that following shell fragment (6) matches, and the spring (8) that matches with described spring plate (7), the described shell fragment (5) of going up is provided with described first fixed contact (b1), described shell fragment (6) down is provided with described second fixed contact (b2), described spring plate (7) is provided with described moving contact (a), described moving contact (a) and described first fixed contact (b1), second fixed contact (b2) matches.
3. gas differential pressure switch according to claim 2, it is characterized in that: described detection indicating device comprises testing circuit, and described testing circuit and described first fixed contact (b1), second fixed contact (b2) and moving contact (a) are electrically connected and detect described moving contact (a) and described first fixed contact (b1) or with the closure state of described second fixed contact (b2) and indicated.
4. gas differential pressure switch according to claim 3, it is characterized in that: described testing circuit comprises first indicating device, second indicating device, first resistance (R1), second resistance (R2) and binding post (P1), described first indicating device is connected with first resistance (R1), second indicating device is connected with second resistance (R2), described first indicating device that is in series and first resistance (R1) are in parallel with second indicating device that is in series and second resistance (R2), common No. 2 ports that insert described binding post (P1) of one end of described first resistance (R1) and second resistance (R2), one end of described first indicating device and second indicating device is connected with second fixed contact (b2) with described first fixed contact (b1) respectively, and described moving contact (a) is connected with No. 1 port of described binding post (P1).
5. gas differential pressure switch according to claim 4 is characterized in that: described first indicating device and second indicating device are light-emitting diode or buzzer or vibrator.
6. gas differential pressure switch according to claim 2, it is characterized in that: described contact actuating mechanism also comprises U type shell fragment (9), the body of described spring plate (7) has breach (71), described breach (71) is extended with or is provided with front end shell fragment moving up and down (72), and the other end of the front end flexible connection of an end of described U type shell fragment (9) and described shell fragment (72), the other end and described breach (71) flexibly connects.
7. gas differential pressure switch according to claim 6, it is characterized in that: described gas differential pressure switch also comprises pressure adjustment knob (10), one end of described spring (8) relies on the described shell fragment (72), the other end is connected with described pressure adjustment knob (10), and described air film (2) contacts with described shell fragment (72).
8. gas differential pressure switch according to claim 1 is characterized in that: described detection indicating device is located on the described housing, dismountable protective cover (11) that is equipped with on the described housing, and described detection indicating device is positioned at described protective cover (11).
9. gas differential pressure switch according to claim 8 is characterized in that: described protective cover (11) adopts transparent material to make, and has through hole or is provided with reinforcement on the described protective cover (11).
10. gas differential pressure switch according to claim 3, it is characterized in that: described testing circuit comprises light-emitting diode (D1), resistance (R1) and binding post (P1), described light-emitting diode (D1) is in series with resistance (R1), binding post (P1), described resistance (R1) termination is gone into No. 2 ports of described binding post (P1), described light-emitting diode (D1) end is connected with described first fixed contact (b1), and described moving contact (a) is connected with No. 1 port of described binding post (P1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101751986A CN101930872A (en) | 2009-06-26 | 2009-10-20 | Improved gas differential pressure switch |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910148455 | 2009-06-26 | ||
| CN200910148455.7 | 2009-06-26 | ||
| CN2009101751986A CN101930872A (en) | 2009-06-26 | 2009-10-20 | Improved gas differential pressure switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101930872A true CN101930872A (en) | 2010-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101751986A Pending CN101930872A (en) | 2009-06-26 | 2009-10-20 | Improved gas differential pressure switch |
Country Status (1)
| Country | Link |
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| CN (1) | CN101930872A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810431A (en) * | 2011-06-01 | 2012-12-05 | 瑞士富巴自动化控制股份有限公司 | Differential pressure switch |
| CN103117178A (en) * | 2011-11-16 | 2013-05-22 | 褚锦雄 | Switch on-off vibration prompting device |
| CN105304406A (en) * | 2014-05-27 | 2016-02-03 | 基德科技公司 | Pneumatic detection using a liquefied compressed gas |
| CN112146227A (en) * | 2020-08-31 | 2020-12-29 | 珠海格力电器股份有限公司 | Pressure detection switch, air conditioner control method and device, air conditioner and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0290431A (en) * | 1988-09-27 | 1990-03-29 | Asahi Optical Co Ltd | Air pressure sensor |
| CN2591757Y (en) * | 2002-12-31 | 2003-12-10 | 乐清市力夫机电有限公司 | Air pressure switch |
| CN2694466Y (en) * | 2003-12-22 | 2005-04-20 | 丁凯南 | Blast switch |
| CN1996528A (en) * | 2006-12-27 | 2007-07-11 | 全华德 | Pressure cut-off switch |
-
2009
- 2009-10-20 CN CN2009101751986A patent/CN101930872A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0290431A (en) * | 1988-09-27 | 1990-03-29 | Asahi Optical Co Ltd | Air pressure sensor |
| CN2591757Y (en) * | 2002-12-31 | 2003-12-10 | 乐清市力夫机电有限公司 | Air pressure switch |
| CN2694466Y (en) * | 2003-12-22 | 2005-04-20 | 丁凯南 | Blast switch |
| CN1996528A (en) * | 2006-12-27 | 2007-07-11 | 全华德 | Pressure cut-off switch |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810431A (en) * | 2011-06-01 | 2012-12-05 | 瑞士富巴自动化控制股份有限公司 | Differential pressure switch |
| CN102810431B (en) * | 2011-06-01 | 2016-08-24 | 瑞士富巴自动化控制股份有限公司 | Differential pressure switch |
| CN103117178A (en) * | 2011-11-16 | 2013-05-22 | 褚锦雄 | Switch on-off vibration prompting device |
| CN105304406A (en) * | 2014-05-27 | 2016-02-03 | 基德科技公司 | Pneumatic detection using a liquefied compressed gas |
| CN105304406B (en) * | 2014-05-27 | 2019-09-10 | 基德科技公司 | Use the pneumatic detection of liquified compressed gas |
| CN112146227A (en) * | 2020-08-31 | 2020-12-29 | 珠海格力电器股份有限公司 | Pressure detection switch, air conditioner control method and device, air conditioner and storage medium |
| CN112146227B (en) * | 2020-08-31 | 2022-04-12 | 珠海格力电器股份有限公司 | Pressure detection switch, air conditioner control method and device, air conditioner and storage medium |
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Application publication date: 20101229 |