JPH0945191A - Differential pressure switch - Google Patents
Differential pressure switchInfo
- Publication number
- JPH0945191A JPH0945191A JP19749395A JP19749395A JPH0945191A JP H0945191 A JPH0945191 A JP H0945191A JP 19749395 A JP19749395 A JP 19749395A JP 19749395 A JP19749395 A JP 19749395A JP H0945191 A JPH0945191 A JP H0945191A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- chamber
- fixed contact
- pressure chamber
- differential pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Landscapes
- Switches Operated By Changes In Physical Conditions (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は差圧スイッチに係
り、さらに詳しくは、真空式下水収集システムのような
腐食性流体に晒され、かつ微差圧の検出を要求される設
備にも使用できる差圧スイッチに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential pressure switch, and more particularly, it can be used in equipment such as a vacuum type sewage collection system which is exposed to a corrosive fluid and requires detection of a slight differential pressure. Regarding differential pressure switch.
【0002】[0002]
【従来の技術】従来の差圧スイッチとして、たとえば図
2に示すものが知られている。この差圧スイッチは、ス
イッチボックス10と、スイッチボックス10の内部を
第1圧力室11と第2圧力室12の2つの室に分割する
ダイヤフラム13を備え、第1圧力室11に連設された
スイッチ収納室14にマイクロスイッチ15が収納さ
れ、このマイクロスイッチ15とダイヤフラム13を連
接棒で16互いに連接するとともに、第1圧力室11に
第1圧力ポート11Aを設け、第2圧力室12に第2圧
力ポート12Aを設けた構造になっている。2. Description of the Related Art As a conventional differential pressure switch, for example, one shown in FIG. 2 is known. This differential pressure switch includes a switch box 10 and a diaphragm 13 that divides the inside of the switch box 10 into two chambers, a first pressure chamber 11 and a second pressure chamber 12, and is connected to the first pressure chamber 11. A micro switch 15 is housed in the switch housing chamber 14. The micro switch 15 and the diaphragm 13 are connected to each other by a connecting rod 16 and a first pressure port 11A is provided in the first pressure chamber 11 and a second pressure chamber 12 is provided in the second pressure chamber 12. The structure has two pressure ports 12A.
【0003】この種の差圧スイッチによれば、第1圧力
ポート11Aから第1圧力室11に負荷される圧力P1
と第2圧力ポート12Aから第2圧力室12に負荷され
る圧力P2との圧力差によってダイヤフラム13は変位
し、設定点でマイクロスイッチ15をON・OFFさせ
る。According to this type of differential pressure switch, the pressure P1 applied from the first pressure port 11A to the first pressure chamber 11 is increased.
And the pressure P2 applied to the second pressure chamber 12 from the second pressure port 12A causes the diaphragm 13 to be displaced, and the micro switch 15 is turned on / off at a set point.
【0004】ところが、この差圧スイッチをたとえば真
空式下水収集システムの真空弁マス内で使用すると、汚
水や真空弁マス内の空気のような腐食性流体が第1圧力
室11および第2圧力室12に導入される。腐食性流体
が第2圧力室12に導入されてもマイクロスイッチ15
に悪影響をおよぼすことはない。However, when the differential pressure switch is used in, for example, the vacuum valve mass of the vacuum type sewage collection system, corrosive fluid such as dirty water or air in the vacuum valve mass causes the first pressure chamber 11 and the second pressure chamber. Introduced in 12. Even if the corrosive fluid is introduced into the second pressure chamber 12, the micro switch 15
Will not be adversely affected.
【0005】しかし、腐食性流体が第1圧力室11に導
入されることによって、スイッチ収納室14に収納され
ているマイクロスイッチ15が腐食性流体に晒され、電
気的端子部に腐食が生じて差圧スイッチの寿命を短くす
る要因になる。したがって、真空式下水収集システムの
ような腐食性流体に晒される設備での使用が制限され
る。また、微差圧の検出に適していないので微差圧の検
出を要求される前記設備への使用も制限される。However, when the corrosive fluid is introduced into the first pressure chamber 11, the micro switch 15 accommodated in the switch accommodating chamber 14 is exposed to the corrosive fluid, causing corrosion in the electrical terminals. This will shorten the life of the differential pressure switch. Therefore, its use in equipment exposed to corrosive fluids, such as vacuum sewage collection systems, is limited. Further, since it is not suitable for detecting the slight differential pressure, its use in the above-mentioned equipment which requires the detection of the slight differential pressure is also limited.
【0006】さらに、マイクロスイッチ15のON・O
FF状態において常時電流が導通しているため、消費電
力が大きく作動用電源としてバッテリーを使用した場
合、作動用電源の寿命が短くなり、その交換頻度あるい
は充電頻度が高くなってメンテナンスを困難にするなど
の欠点を有している。Further, the ON / O of the microswitch 15 is turned on.
Since current is always conducted in the FF state, power consumption is large and when a battery is used as an operating power source, the operating power source has a short life, and its replacement frequency or charging frequency becomes high, which makes maintenance difficult. It has drawbacks such as
【0007】[0007]
【発明が解決しようとする課題】すなわち、従来の差圧
スイッチでは、腐食性流体に晒される設備で使用する
と、電気的端子部に腐食を生じて差圧スイッチの寿命が
短くなるので、差圧スイッチの使用範囲が制限される。
また、微差圧の検出に適していないので微差圧の検出を
要求される設備への使用が制限される。しかも、マイク
ロスイッチのON・OFF状態において常時電流が導通
しているため、消費電力が大きく作動用電源としてバッ
テリーを使用した場合、作動用電源の寿命が短くなり、
その交換頻度あるいは充電頻度が高くなってメンテナン
スを困難にするなどの欠点を有している。そこで、請求
項1記載の発明は、真空式下水収集システムのような腐
食性流体に晒され、かつ微差圧の検出を要求される設備
に使用しても、腐食性流体による電気的端子部の腐食を
防止して延命を図るとともに、微差圧の検出を可能にし
て使用範囲を拡大し、消費電力を低減することによっ
て、作動用電源の延命を図り、その交換頻度あるいは充
電頻度を低くして、メンテナンスを容易にする差圧スイ
ッチを提供することを目的としたものである。That is, in the conventional differential pressure switch, when it is used in equipment exposed to corrosive fluid, corrosion occurs in the electrical terminals and shortens the life of the differential pressure switch. The use range of the switch is limited.
Further, since it is not suitable for detecting a slight differential pressure, its use is limited to equipment requiring detection of a slight differential pressure. Moreover, since the current is always conducted in the ON / OFF state of the micro switch, the power consumption is large and when the battery is used as the operation power supply, the life of the operation power supply is shortened,
It has a drawback that the replacement frequency or the charging frequency becomes high and maintenance becomes difficult. Therefore, the invention according to claim 1 uses the corrosive fluid for electrical terminals even when used in equipment that is exposed to a corrosive fluid such as a vacuum sewage collection system and is required to detect a slight differential pressure. The corrosion resistance of the power supply is extended to prolong its life, and the differential pressure can be detected to expand the range of use and reduce the power consumption, thereby extending the life of the operating power supply and reducing its replacement frequency or charging frequency. The purpose of the present invention is to provide a differential pressure switch that facilitates maintenance.
【0008】[0008]
【課題を解決するための手段】前記目的を達成するため
に、請求項1の発明は、スイッチボックスと、連接棒に
互いに対向して取付けられてスイッチボックスの内部に
配置されるとともに、スイッチボックスの内部を中間密
閉室とこの中間密閉室の両側に隣接する第1圧力室およ
び第2圧力室の3つの室に独立して分割する1対のダイ
ヤフラムと、前記中間密閉室内で前記連接棒に設けられ
た共通可動接片と、この共通可動接片と前記1対のダイ
ヤフラムの間に設けた第1固定接点および第2固定接点
を具備し、前記第1圧力室に第1圧力ポートが設けら
れ、前記第2圧力室に第2圧力ポートが設けられている
ことを特徴としたものである。請求項1記載の発明によ
れば、第1圧力ポートから第1圧力室に負荷される圧力
と第2圧力ポートから第2圧力室に負荷される圧力との
圧力差によって1対のダイヤフラムと連接棒および共通
可動接片は変位し、固有の設定点で共通可動接片が第1
固定接点および第2固定接点のいずれか一方に接触して
電気的導通状態を形成する。共通可動接片、第1固定接
点および第2固定接点は中間密閉室に収納されているの
で、第1圧力室および第2圧力室が腐食性流体に晒され
る条件下で使用しても、腐食性流体による共通可動接
片、第1固定接点および第2固定接点の腐食を防止する
ことができる。また、スイッチボックスの外部温度の変
動に伴って中間密閉室内の空気が僅かに膨脹・収縮して
も、この僅かな膨脹・収縮は1対のダイヤフラムによっ
て吸収できる。したがって、連接棒および共通可動接片
が中間密閉室内空気の僅かな膨脹・収縮によって変位
し、第1固定接点もしくは第2固定接点に接触すること
はない。つまり、中間密閉室内の僅かな圧力変動による
誤動作の発生を回避して微差圧を検出することができ
る。さらに、圧力差が固有の設定点より小さい領域で
は、共通可動接片が変位して第1固定接点もしくは第2
固定接点に接触しない状態、つまり電気的非導通状態を
保持できる。In order to achieve the above object, the invention of claim 1 is a switch box and a connecting rod, which are attached to the connecting rod so as to face each other and are arranged inside the switch box. A pair of diaphragms that independently divides the interior of the chamber into three chambers, a first pressure chamber and a second pressure chamber, which are adjacent to both sides of the intermediate sealed chamber, and the connecting rod in the intermediate sealed chamber. A common movable contact piece provided, and a first fixed contact and a second fixed contact provided between the common movable contact piece and the pair of diaphragms, and a first pressure port provided in the first pressure chamber. In addition, a second pressure port is provided in the second pressure chamber. According to the first aspect of the invention, the pair of diaphragms are connected by the pressure difference between the pressure applied to the first pressure chamber from the first pressure port and the pressure applied to the second pressure chamber from the second pressure port. The rod and the common movable contact are displaced, and the common movable contact is the first at the unique set point.
One of the fixed contact and the second fixed contact is contacted to form an electrical conduction state. Since the common movable contact piece, the first fixed contact, and the second fixed contact are housed in the intermediate sealed chamber, even if the first pressure chamber and the second pressure chamber are used under the condition that they are exposed to a corrosive fluid, they are corroded. It is possible to prevent the common movable contact piece, the first fixed contact, and the second fixed contact from being corroded by the oxidative fluid. Further, even if the air in the intermediate closed chamber slightly expands or contracts due to the change in the external temperature of the switch box, the slight expansion or contraction can be absorbed by the pair of diaphragms. Therefore, the connecting rod and the common movable contact piece are not displaced by the slight expansion and contraction of the air in the intermediate sealed room, and do not come into contact with the first fixed contact or the second fixed contact. That is, the slight differential pressure can be detected while avoiding the occurrence of malfunction due to a slight pressure fluctuation in the intermediate sealed chamber. Further, in the region where the pressure difference is smaller than the specific set point, the common movable contact piece is displaced to cause the first fixed contact or the second fixed contact.
The state where the fixed contact is not contacted, that is, the electrically non-conducting state can be maintained.
【0009】[0009]
【発明の実施の形態】以下、請求項1記載の発明の実施
の形態を図面に基づいて説明する。図1において、1は
スイッチボックスで、このスイッチボックス1の内部
は、1対のダイヤフラム2A,2Bによって中間密閉室
3と、この中間密閉室3の両側に隣接する第1圧力室4
および第2圧力室5の3つの室に独立して分割されてお
り、第1圧力室4に第1圧力ポート4Aが設けられ、第
2圧力室5に第2圧力ポート5Aが設けられている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the invention described in claim 1 will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a switch box, and the inside of the switch box 1 includes an intermediate closed chamber 3 and a first pressure chamber 4 adjacent to both sides of the intermediate closed chamber 3 by a pair of diaphragms 2A and 2B.
And the second pressure chamber 5 are independently divided into three chambers, the first pressure chamber 4 is provided with the first pressure port 4A, and the second pressure chamber 5 is provided with the second pressure port 5A. .
【0010】ダイヤフラム2A,2Bは、その外周端縁
部をスイッチボックス1の周壁に気密あるいは液密に取
付けられ、かつ中心部は連接棒6の軸方向両端に固着さ
れることで、所定の間隔を有して互いに対向してスイッ
チボックス1の内部に配置されている。The diaphragms 2A and 2B have their outer peripheral edge portions airtightly or liquidtightly attached to the peripheral wall of the switch box 1, and the central portions thereof are fixed to both axial ends of the connecting rod 6 so that a predetermined distance is maintained. Are disposed inside the switch box 1 so as to face each other.
【0011】連接棒6の軸方向中央部に共通可動接片7
が径外方向に張出して設けられている。また、中間密閉
室3内に臨出して共通可動接片7とダイヤフラム2Aの
間に第1固定接点8が設けられ、共通可動接片7とダイ
ヤフラム2Bの間に第2固定接点9が設けられている。A common movable contact piece 7 is provided at the axial center of the connecting rod 6.
Are provided so as to project radially outward. Further, a first fixed contact 8 is provided between the common movable contact piece 7 and the diaphragm 2A, and the second fixed contact 9 is provided between the common movable contact piece 7 and the diaphragm 2B. ing.
【0012】前記構成において、第1圧力ポート4Aか
ら第1圧力室4に負荷される圧力P1と第2圧力ポート
5Aから第2圧力室5に負荷される圧力P2との圧力差
によって1対のダイヤフラム2A,2Bと連接棒6およ
び共通可動接片7は変位し、固有の設定点で共通可動接
片7が第1固定接点8および第2固定接点9のいずれか
一方に接触して電気的導通状態を形成する。すなわち、
P1>P2の関係で、P1とP2の圧力差が差圧スイッ
チ固有の設定点になった時、1対のダイヤフラム2A,
2Bと連接棒6および共通可動接片7が矢印Y1方向に
変位して、共通可動接片7が第2固定接点9に接触して
電気的導通状態を形成する。また、P1<P2の関係
で、P1とP2の圧力差が差圧スイッチ固有の設定点に
なった時、1対のダイヤフラム2A,2Bと連接棒6お
よび共通可動接片7が矢印Y2方向に変位して、共通可
動接片7が第1固定接点8に接触して電気的導通状態を
形成する。In the above structure, the pressure difference between the pressure P1 applied from the first pressure port 4A to the first pressure chamber 4 and the pressure P2 applied from the second pressure port 5A to the second pressure chamber 5 makes a pair. The diaphragms 2A, 2B, the connecting rod 6 and the common movable contact piece 7 are displaced, and the common movable contact piece 7 comes into contact with either one of the first fixed contact 8 and the second fixed contact 9 at a specific set point, and the electrical connection is achieved. Form a conductive state. That is,
Due to the relationship of P1> P2, when the pressure difference between P1 and P2 becomes the set point specific to the differential pressure switch, the pair of diaphragms 2A,
2B, the connecting rod 6 and the common movable contact piece 7 are displaced in the arrow Y1 direction, and the common movable contact piece 7 contacts the second fixed contact 9 to form an electrical conduction state. Further, in the relationship of P1 <P2, when the pressure difference between P1 and P2 becomes the set point peculiar to the differential pressure switch, the pair of diaphragms 2A and 2B, the connecting rod 6 and the common movable contact piece 7 move in the direction of the arrow Y2. Upon displacement, the common movable contact piece 7 comes into contact with the first fixed contact 8 to form an electrically conductive state.
【0013】共通可動接片7、第1固定接点8および第
2固定接点9は中間密閉室3に収納されているので、第
1圧力室4および第2圧力室5が汚水や真空弁マス内の
空気のような腐食性流体に晒される真空式下水収集シス
テムのような設備で使用しても、腐食性流体による共通
可動接片7、第1固定接点8および第2固定接点9の腐
食を防止して、差圧スイッチの延命を図るすることがで
きるので、差圧スイッチの使用範囲を拡大できる。Since the common movable contact piece 7, the first fixed contact 8 and the second fixed contact 9 are housed in the intermediate closed chamber 3, the first pressure chamber 4 and the second pressure chamber 5 are sewage and the vacuum valve mass. Even when used in equipment such as a vacuum-type sewage collection system that is exposed to corrosive fluids such as air, the common movable contact piece 7, the first fixed contact 8 and the second fixed contact 9 are corroded by the corrosive fluid. Since this can be prevented and the life of the differential pressure switch can be extended, the range of use of the differential pressure switch can be expanded.
【0014】また、スイッチボックス1の外部温度の変
動に伴って中間密閉室3内の空気が僅かに膨脹・収縮し
ても、この僅かな膨脹・収縮は1対のダイヤフラム2
A,2Bによって吸収できる。したがって、連接棒6お
よび共通可動接片7が中間密閉室3内空気の僅かな膨脹
・収縮によって変位し、第1固定接点8もしくは第2固
定接点9に接触することはない。つまり、外部温度の変
動に伴なう中間密閉室3内の僅かな圧力変動による誤動
作の発生を回避できるので微差圧の検出が可能になる。
すなわち、差圧スイッチ固有の設定点を小さくすること
で、P1とP2との微差圧によって共通可動接片7が第
1固定接点8および第2固定接点9のいずれか一方に接
触して電気的導通状態を形成できるように構成しても、
中間密閉室3内の僅かな圧力変動による誤動作の発生を
確実に回避することができる。この点から、真空式下水
収集システムのように微差圧の検出を要求される設備へ
の使用が可能になり、差圧スイッチの使用範囲を拡大で
きる。Further, even if the air in the intermediate closed chamber 3 slightly expands or contracts due to the fluctuation of the external temperature of the switch box 1, the slight expansion or contraction of the air causes the pair of diaphragms 2 to move.
Can be absorbed by A and 2B. Therefore, the connecting rod 6 and the common movable contact piece 7 are not displaced by the slight expansion and contraction of the air in the intermediate sealed chamber 3, and do not come into contact with the first fixed contact 8 or the second fixed contact 9. In other words, since it is possible to avoid the occurrence of malfunction due to a slight pressure fluctuation in the intermediate closed chamber 3 due to the fluctuation of the external temperature, it is possible to detect the slight differential pressure.
That is, by reducing the set point peculiar to the differential pressure switch, the common movable contact piece 7 comes into contact with either one of the first fixed contact 8 and the second fixed contact 9 due to the slight differential pressure between P1 and P2, and electrical Even if it is configured to form a static conduction state,
It is possible to reliably avoid the occurrence of malfunction due to slight pressure fluctuations in the intermediate closed chamber 3. From this point, it can be used in equipment such as a vacuum type sewage collection system that requires detection of a slight differential pressure, and the range of use of the differential pressure switch can be expanded.
【0015】さらに、圧力差が固有の設定点より小さい
領域では、共通可動接片7が変位して第1固定接点8も
しくは第2固定接点9に接触しない状態、つまり図示の
ような電気的非導通状態を保持できる。したがって、消
費電力が低減されるから作動用電源としてバッテリーを
使用した場合、作動用電源の延命を達成し、交換頻度あ
るいは充電頻度を低くしてメンテナンスの容易化を図れ
る。Further, in the region where the pressure difference is smaller than the specific set point, the common movable contact piece 7 is displaced and does not contact the first fixed contact 8 or the second fixed contact 9, that is, the electrical non-contact as shown in the figure. The conduction state can be maintained. Therefore, when the battery is used as the operating power source because the power consumption is reduced, it is possible to extend the life of the operating power source and reduce the replacement frequency or the charging frequency to facilitate the maintenance.
【0016】[0016]
【発明の効果】以上説明したように、請求項1記載の発
明は、共通可動接片、第1固定接点および第2固定接点
は中間密閉室に収納されているので、第1圧力室および
第2圧力室が汚水や真空弁マス内の空気のような腐食性
流体に晒される真空式下水収集システムのような設備で
使用しても、腐食性流体による共通可動接片、第1固定
接点および第2固定接点の腐食を防止して、差圧スイッ
チの延命を図るすることができるので、差圧スイッチの
使用範囲を拡大できる。また、外部温度の変動に伴って
中間密閉室内の空気が僅かに膨脹・収縮しても、この僅
かな膨脹・収縮は1対のダイヤフラムによって吸収でき
るので、差圧スイッチ固有の設定点を小さくすること
で、微差圧によって共通可動接片が第1固定接点および
第2固定接点のいずれか一方に接触して電気的導通状態
を形成して、誤動作の発生を確実に回避することができ
るので、真空式下水収集システムのように微差圧の検出
を要求される設備への使用が可能になり、差圧スイッチ
の使用範囲を拡大できる。さらに、圧力差が固有の設定
点より小さい領域では、電気的非導通状態を保持して、
消費電力を低減できるので作動用電源としてバッテリー
を使用した場合、作動用電源の延命を達成し、交換頻度
あるいは充電頻度を低くしてメンテナンスの容易化を図
れる。As described above, according to the first aspect of the invention, since the common movable contact piece, the first fixed contact and the second fixed contact are housed in the intermediate sealed chamber, the first pressure chamber and the first pressure chamber 2 Even when used in equipment such as vacuum type sewage collection system where the pressure chamber is exposed to corrosive fluid such as dirty water or air in the vacuum valve mass, the common movable contact piece, first fixed contact and Since the corrosion of the second fixed contact can be prevented and the life of the differential pressure switch can be extended, the range of use of the differential pressure switch can be expanded. Further, even if the air in the intermediate closed chamber slightly expands or contracts due to the fluctuation of the external temperature, the slight expansion or contraction can be absorbed by the pair of diaphragms, so that the set point specific to the differential pressure switch is made small. As a result, the common movable contact piece is brought into contact with either one of the first fixed contact and the second fixed contact due to the slight differential pressure to form an electrically conductive state, so that the occurrence of malfunction can be reliably avoided. , Can be used for equipment that requires detection of a slight differential pressure, such as a vacuum type sewage collection system, and the range of use of the differential pressure switch can be expanded. Furthermore, in the region where the pressure difference is smaller than the specific set point, the electrical non-conduction state is maintained,
Since the power consumption can be reduced, when a battery is used as the operating power source, the operating power source can be extended in life, and the frequency of replacement or charging can be reduced to facilitate maintenance.
【図1】本発明の実施の形態を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図2】従来例の断面図である。FIG. 2 is a sectional view of a conventional example.
1 スイッチボックス 2A ダイヤフラム 2B ダイヤフラム 3 中間密閉室 4 第1圧力室 4A 第1圧力ポート 5 第2圧力室 5A 第2圧力ポート 6 連接棒 7 共通可動接片 8 第1固定接点 9 第2固定接点 1 Switch Box 2A Diaphragm 2B Diaphragm 3 Intermediate Sealing Chamber 4 1st Pressure Chamber 4A 1st Pressure Port 5 2nd Pressure Chamber 5A 2nd Pressure Port 6 Connecting Rod 7 Common Moving Contact 8 1st Fixed Contact 9 2nd Fixed Contact
Claims (1)
向して取付けられてスイッチボックスの内部に配置され
るとともに、スイッチボックスの内部を中間密閉室とこ
の中間密閉室の両側に隣接する第1圧力室および第2圧
力室の3つの室に独立して分割する1対のダイヤフラム
と、前記中間密閉室内で前記連接棒に設けられた共通可
動接片と、この共通可動接片と前記1対のダイヤフラム
の間に設けた第1固定接点および第2固定接点を具備
し、前記第1圧力室に第1圧力ポートが設けられ、前記
第2圧力室に第2圧力ポートが設けられていることを特
徴とする差圧スイッチ。1. A switch box and a connecting rod which are attached to each other so as to face each other and are arranged inside the switch box, and the inside of the switch box is an intermediate closed chamber and first pressures adjacent to both sides of the intermediate closed chamber. A pair of diaphragms that are independently divided into three chambers, a chamber and a second pressure chamber, a common movable contact piece provided on the connecting rod in the intermediate sealed chamber, the common movable contact piece and the pair of diaphragms. A first fixed contact and a second fixed contact provided between the diaphragms, wherein the first pressure chamber is provided with a first pressure port, and the second pressure chamber is provided with a second pressure port. Characteristic differential pressure switch.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19749395A JPH0945191A (en) | 1995-08-02 | 1995-08-02 | Differential pressure switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19749395A JPH0945191A (en) | 1995-08-02 | 1995-08-02 | Differential pressure switch |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0945191A true JPH0945191A (en) | 1997-02-14 |
Family
ID=16375394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19749395A Abandoned JPH0945191A (en) | 1995-08-02 | 1995-08-02 | Differential pressure switch |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0945191A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018150458A1 (en) * | 2017-02-14 | 2018-08-23 | 株式会社生方製作所 | Pressure switch, and hermeticall sealed electric compressor |
-
1995
- 1995-08-02 JP JP19749395A patent/JPH0945191A/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018150458A1 (en) * | 2017-02-14 | 2018-08-23 | 株式会社生方製作所 | Pressure switch, and hermeticall sealed electric compressor |
JPWO2018150458A1 (en) * | 2017-02-14 | 2019-07-04 | 株式会社生方製作所 | Pressure switch and hermetic electric compressor |
US10886084B2 (en) | 2017-02-14 | 2021-01-05 | Ubukata Industries Co., Ltd. | Pressure switch and hermetically sealed electric compressor |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A762 | Written abandonment of application |
Effective date: 20040528 Free format text: JAPANESE INTERMEDIATE CODE: A762 |
|
A521 | Written amendment |
Effective date: 20040528 Free format text: JAPANESE INTERMEDIATE CODE: A821 |